diff options
Diffstat (limited to 'drivers/counter')
-rw-r--r-- | drivers/counter/104-quad-8.c | 1606 | ||||
-rw-r--r-- | drivers/counter/Kconfig | 56 | ||||
-rw-r--r-- | drivers/counter/Makefile | 5 | ||||
-rw-r--r-- | drivers/counter/counter-chrdev.c | 676 | ||||
-rw-r--r-- | drivers/counter/counter-chrdev.h | 14 | ||||
-rw-r--r-- | drivers/counter/counter-core.c | 282 | ||||
-rw-r--r-- | drivers/counter/counter-sysfs.c | 1170 | ||||
-rw-r--r-- | drivers/counter/counter-sysfs.h | 13 | ||||
-rw-r--r-- | drivers/counter/counter.c | 1496 | ||||
-rw-r--r-- | drivers/counter/ftm-quaddec.c | 102 | ||||
-rw-r--r-- | drivers/counter/intel-qep.c | 526 | ||||
-rw-r--r-- | drivers/counter/interrupt-cnt.c | 256 | ||||
-rw-r--r-- | drivers/counter/microchip-tcb-capture.c | 407 | ||||
-rw-r--r-- | drivers/counter/stm32-lptimer-cnt.c | 550 | ||||
-rw-r--r-- | drivers/counter/stm32-timer-cnt.c | 347 | ||||
-rw-r--r-- | drivers/counter/ti-ecap-capture.c | 615 | ||||
-rw-r--r-- | drivers/counter/ti-eqep.c | 297 |
17 files changed, 5331 insertions, 3087 deletions
diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index 17e67a84777d..deed4afadb29 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -9,53 +9,94 @@ #include <linux/counter.h> #include <linux/device.h> #include <linux/errno.h> -#include <linux/iio/iio.h> -#include <linux/iio/types.h> #include <linux/io.h> #include <linux/ioport.h> +#include <linux/interrupt.h> #include <linux/isa.h> #include <linux/kernel.h> +#include <linux/list.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> +#include <linux/spinlock.h> #define QUAD8_EXTENT 32 static unsigned int base[max_num_isa_dev(QUAD8_EXTENT)]; static unsigned int num_quad8; -module_param_array(base, uint, &num_quad8, 0); +module_param_hw_array(base, uint, ioport, &num_quad8, 0); MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses"); +static unsigned int irq[max_num_isa_dev(QUAD8_EXTENT)]; +static unsigned int num_irq; +module_param_hw_array(irq, uint, irq, &num_irq, 0); +MODULE_PARM_DESC(irq, "ACCES 104-QUAD-8 interrupt line numbers"); + #define QUAD8_NUM_COUNTERS 8 /** - * struct quad8_iio - IIO device private data structure + * struct channel_reg - channel register structure + * @data: Count data + * @control: Channel flags and control + */ +struct channel_reg { + u8 data; + u8 control; +}; + +/** + * struct quad8_reg - device register structure + * @channel: quadrature counter data and control + * @interrupt_status: channel interrupt status + * @channel_oper: enable/reset counters and interrupt functions + * @index_interrupt: enable channel interrupts + * @reserved: reserved for Factory Use + * @index_input_levels: index signal logical input level + * @cable_status: differential encoder cable status + */ +struct quad8_reg { + struct channel_reg channel[QUAD8_NUM_COUNTERS]; + u8 interrupt_status; + u8 channel_oper; + u8 index_interrupt; + u8 reserved[3]; + u8 index_input_levels; + u8 cable_status; +}; + +/** + * struct quad8 - device private data structure + * @lock: lock to prevent clobbering device states during R/W ops * @counter: instance of the counter_device + * @fck_prescaler: array of filter clock prescaler configurations * @preset: array of preset values * @count_mode: array of count mode configurations * @quadrature_mode: array of quadrature mode configurations * @quadrature_scale: array of quadrature mode scale configurations * @ab_enable: array of A and B inputs enable configurations * @preset_enable: array of set_to_preset_on_index attribute configurations + * @irq_trigger: array of current IRQ trigger function configurations * @synchronous_mode: array of index function synchronous mode configurations * @index_polarity: array of index function polarity configurations - * @base: base port address of the IIO device + * @cable_fault_enable: differential encoder cable status enable configurations + * @reg: I/O address offset for the device registers */ -struct quad8_iio { - struct counter_device counter; +struct quad8 { + spinlock_t lock; + unsigned int fck_prescaler[QUAD8_NUM_COUNTERS]; unsigned int preset[QUAD8_NUM_COUNTERS]; unsigned int count_mode[QUAD8_NUM_COUNTERS]; unsigned int quadrature_mode[QUAD8_NUM_COUNTERS]; unsigned int quadrature_scale[QUAD8_NUM_COUNTERS]; unsigned int ab_enable[QUAD8_NUM_COUNTERS]; unsigned int preset_enable[QUAD8_NUM_COUNTERS]; + unsigned int irq_trigger[QUAD8_NUM_COUNTERS]; unsigned int synchronous_mode[QUAD8_NUM_COUNTERS]; unsigned int index_polarity[QUAD8_NUM_COUNTERS]; - unsigned int base; + unsigned int cable_fault_enable; + struct quad8_reg __iomem *reg; }; -#define QUAD8_REG_CHAN_OP 0x11 -#define QUAD8_REG_INDEX_INPUT_LEVELS 0x16 /* Borrow Toggle flip-flop */ #define QUAD8_FLAG_BT BIT(0) /* Carry Toggle flip-flop */ @@ -84,618 +125,174 @@ struct quad8_iio { #define QUAD8_RLD_PRESET_CNTR 0x08 /* Transfer Counter to Output Latch */ #define QUAD8_RLD_CNTR_OUT 0x10 -#define QUAD8_CHAN_OP_ENABLE_COUNTERS 0x00 +/* Transfer Preset Register LSB to FCK Prescaler */ +#define QUAD8_RLD_PRESET_PSC 0x18 #define QUAD8_CHAN_OP_RESET_COUNTERS 0x01 +#define QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC 0x04 #define QUAD8_CMR_QUADRATURE_X1 0x08 #define QUAD8_CMR_QUADRATURE_X2 0x10 #define QUAD8_CMR_QUADRATURE_X4 0x18 - -static int quad8_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, int *val, int *val2, long mask) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - const int base_offset = priv->base + 2 * chan->channel; - unsigned int flags; - unsigned int borrow; - unsigned int carry; - int i; - - switch (mask) { - case IIO_CHAN_INFO_RAW: - if (chan->type == IIO_INDEX) { - *val = !!(inb(priv->base + QUAD8_REG_INDEX_INPUT_LEVELS) - & BIT(chan->channel)); - return IIO_VAL_INT; - } - - flags = inb(base_offset + 1); - borrow = flags & QUAD8_FLAG_BT; - carry = !!(flags & QUAD8_FLAG_CT); - - /* Borrow XOR Carry effectively doubles count range */ - *val = (borrow ^ carry) << 24; - - /* Reset Byte Pointer; transfer Counter to Output Latch */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT, - base_offset + 1); - - for (i = 0; i < 3; i++) - *val |= (unsigned int)inb(base_offset) << (8 * i); - - return IIO_VAL_INT; - case IIO_CHAN_INFO_ENABLE: - *val = priv->ab_enable[chan->channel]; - return IIO_VAL_INT; - case IIO_CHAN_INFO_SCALE: - *val = 1; - *val2 = priv->quadrature_scale[chan->channel]; - return IIO_VAL_FRACTIONAL_LOG2; - } - - return -EINVAL; -} - -static int quad8_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, int val, int val2, long mask) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - const int base_offset = priv->base + 2 * chan->channel; - int i; - unsigned int ior_cfg; - - switch (mask) { - case IIO_CHAN_INFO_RAW: - if (chan->type == IIO_INDEX) - return -EINVAL; - - /* Only 24-bit values are supported */ - if ((unsigned int)val > 0xFFFFFF) - return -EINVAL; - - /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); - - /* Counter can only be set via Preset Register */ - for (i = 0; i < 3; i++) - outb(val >> (8 * i), base_offset); - - /* Transfer Preset Register to Counter */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, base_offset + 1); - - /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); - - /* Set Preset Register back to original value */ - val = priv->preset[chan->channel]; - for (i = 0; i < 3; i++) - outb(val >> (8 * i), base_offset); - - /* Reset Borrow, Carry, Compare, and Sign flags */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1); - /* Reset Error flag */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1); - - return 0; - case IIO_CHAN_INFO_ENABLE: - /* only boolean values accepted */ - if (val < 0 || val > 1) - return -EINVAL; - - priv->ab_enable[chan->channel] = val; - - ior_cfg = val | priv->preset_enable[chan->channel] << 1; - - /* Load I/O control configuration */ - outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1); - - return 0; - case IIO_CHAN_INFO_SCALE: - /* Quadrature scaling only available in quadrature mode */ - if (!priv->quadrature_mode[chan->channel] && (val2 || val != 1)) - return -EINVAL; - - /* Only three gain states (1, 0.5, 0.25) */ - if (val == 1 && !val2) - priv->quadrature_scale[chan->channel] = 0; - else if (!val) - switch (val2) { - case 500000: - priv->quadrature_scale[chan->channel] = 1; - break; - case 250000: - priv->quadrature_scale[chan->channel] = 2; - break; - default: - return -EINVAL; - } - else - return -EINVAL; - - return 0; - } - - return -EINVAL; -} - -static const struct iio_info quad8_info = { - .read_raw = quad8_read_raw, - .write_raw = quad8_write_raw -}; - -static ssize_t quad8_read_preset(struct iio_dev *indio_dev, uintptr_t private, - const struct iio_chan_spec *chan, char *buf) -{ - const struct quad8_iio *const priv = iio_priv(indio_dev); - - return snprintf(buf, PAGE_SIZE, "%u\n", priv->preset[chan->channel]); -} - -static ssize_t quad8_write_preset(struct iio_dev *indio_dev, uintptr_t private, - const struct iio_chan_spec *chan, const char *buf, size_t len) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - const int base_offset = priv->base + 2 * chan->channel; - unsigned int preset; - int ret; - int i; - - ret = kstrtouint(buf, 0, &preset); - if (ret) - return ret; - - /* Only 24-bit values are supported */ - if (preset > 0xFFFFFF) - return -EINVAL; - - priv->preset[chan->channel] = preset; - - /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); - - /* Set Preset Register */ - for (i = 0; i < 3; i++) - outb(preset >> (8 * i), base_offset); - - return len; -} - -static ssize_t quad8_read_set_to_preset_on_index(struct iio_dev *indio_dev, - uintptr_t private, const struct iio_chan_spec *chan, char *buf) -{ - const struct quad8_iio *const priv = iio_priv(indio_dev); - - return snprintf(buf, PAGE_SIZE, "%u\n", - !priv->preset_enable[chan->channel]); -} - -static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev, - uintptr_t private, const struct iio_chan_spec *chan, const char *buf, - size_t len) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - const int base_offset = priv->base + 2 * chan->channel + 1; - bool preset_enable; - int ret; - unsigned int ior_cfg; - - ret = kstrtobool(buf, &preset_enable); - if (ret) - return ret; - - /* Preset enable is active low in Input/Output Control register */ - preset_enable = !preset_enable; - - priv->preset_enable[chan->channel] = preset_enable; - - ior_cfg = priv->ab_enable[chan->channel] | - (unsigned int)preset_enable << 1; - - /* Load I/O control configuration to Input / Output Control Register */ - outb(QUAD8_CTR_IOR | ior_cfg, base_offset); - - return len; -} - -static const char *const quad8_noise_error_states[] = { - "No excessive noise is present at the count inputs", - "Excessive noise is present at the count inputs" -}; - -static int quad8_get_noise_error(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - const int base_offset = priv->base + 2 * chan->channel + 1; - - return !!(inb(base_offset) & QUAD8_FLAG_E); -} - -static const struct iio_enum quad8_noise_error_enum = { - .items = quad8_noise_error_states, - .num_items = ARRAY_SIZE(quad8_noise_error_states), - .get = quad8_get_noise_error -}; - -static const char *const quad8_count_direction_states[] = { - "down", - "up" -}; - -static int quad8_get_count_direction(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - const int base_offset = priv->base + 2 * chan->channel + 1; - - return !!(inb(base_offset) & QUAD8_FLAG_UD); -} - -static const struct iio_enum quad8_count_direction_enum = { - .items = quad8_count_direction_states, - .num_items = ARRAY_SIZE(quad8_count_direction_states), - .get = quad8_get_count_direction -}; - -static const char *const quad8_count_modes[] = { - "normal", - "range limit", - "non-recycle", - "modulo-n" -}; - -static int quad8_set_count_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, unsigned int cnt_mode) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - unsigned int mode_cfg = cnt_mode << 1; - const int base_offset = priv->base + 2 * chan->channel + 1; - - priv->count_mode[chan->channel] = cnt_mode; - - /* Add quadrature mode configuration */ - if (priv->quadrature_mode[chan->channel]) - mode_cfg |= (priv->quadrature_scale[chan->channel] + 1) << 3; - - /* Load mode configuration to Counter Mode Register */ - outb(QUAD8_CTR_CMR | mode_cfg, base_offset); - - return 0; -} - -static int quad8_get_count_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - const struct quad8_iio *const priv = iio_priv(indio_dev); - - return priv->count_mode[chan->channel]; -} - -static const struct iio_enum quad8_count_mode_enum = { - .items = quad8_count_modes, - .num_items = ARRAY_SIZE(quad8_count_modes), - .set = quad8_set_count_mode, - .get = quad8_get_count_mode -}; - -static const char *const quad8_synchronous_modes[] = { - "non-synchronous", - "synchronous" -}; - -static int quad8_set_synchronous_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, unsigned int synchronous_mode) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - const unsigned int idr_cfg = synchronous_mode | - priv->index_polarity[chan->channel] << 1; - const int base_offset = priv->base + 2 * chan->channel + 1; - - /* Index function must be non-synchronous in non-quadrature mode */ - if (synchronous_mode && !priv->quadrature_mode[chan->channel]) - return -EINVAL; - - priv->synchronous_mode[chan->channel] = synchronous_mode; - - /* Load Index Control configuration to Index Control Register */ - outb(QUAD8_CTR_IDR | idr_cfg, base_offset); - - return 0; -} - -static int quad8_get_synchronous_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - const struct quad8_iio *const priv = iio_priv(indio_dev); - - return priv->synchronous_mode[chan->channel]; -} - -static const struct iio_enum quad8_synchronous_mode_enum = { - .items = quad8_synchronous_modes, - .num_items = ARRAY_SIZE(quad8_synchronous_modes), - .set = quad8_set_synchronous_mode, - .get = quad8_get_synchronous_mode -}; - -static const char *const quad8_quadrature_modes[] = { - "non-quadrature", - "quadrature" -}; - -static int quad8_set_quadrature_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, unsigned int quadrature_mode) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - unsigned int mode_cfg = priv->count_mode[chan->channel] << 1; - const int base_offset = priv->base + 2 * chan->channel + 1; - - if (quadrature_mode) - mode_cfg |= (priv->quadrature_scale[chan->channel] + 1) << 3; - else { - /* Quadrature scaling only available in quadrature mode */ - priv->quadrature_scale[chan->channel] = 0; - - /* Synchronous function not supported in non-quadrature mode */ - if (priv->synchronous_mode[chan->channel]) - quad8_set_synchronous_mode(indio_dev, chan, 0); - } - - priv->quadrature_mode[chan->channel] = quadrature_mode; - - /* Load mode configuration to Counter Mode Register */ - outb(QUAD8_CTR_CMR | mode_cfg, base_offset); - - return 0; -} - -static int quad8_get_quadrature_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - const struct quad8_iio *const priv = iio_priv(indio_dev); - - return priv->quadrature_mode[chan->channel]; -} - -static const struct iio_enum quad8_quadrature_mode_enum = { - .items = quad8_quadrature_modes, - .num_items = ARRAY_SIZE(quad8_quadrature_modes), - .set = quad8_set_quadrature_mode, - .get = quad8_get_quadrature_mode -}; - -static const char *const quad8_index_polarity_modes[] = { - "negative", - "positive" -}; - -static int quad8_set_index_polarity(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, unsigned int index_polarity) -{ - struct quad8_iio *const priv = iio_priv(indio_dev); - const unsigned int idr_cfg = priv->synchronous_mode[chan->channel] | - index_polarity << 1; - const int base_offset = priv->base + 2 * chan->channel + 1; - - priv->index_polarity[chan->channel] = index_polarity; - - /* Load Index Control configuration to Index Control Register */ - outb(QUAD8_CTR_IDR | idr_cfg, base_offset); - - return 0; -} - -static int quad8_get_index_polarity(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - const struct quad8_iio *const priv = iio_priv(indio_dev); - - return priv->index_polarity[chan->channel]; -} - -static const struct iio_enum quad8_index_polarity_enum = { - .items = quad8_index_polarity_modes, - .num_items = ARRAY_SIZE(quad8_index_polarity_modes), - .set = quad8_set_index_polarity, - .get = quad8_get_index_polarity -}; - -static const struct iio_chan_spec_ext_info quad8_count_ext_info[] = { - { - .name = "preset", - .shared = IIO_SEPARATE, - .read = quad8_read_preset, - .write = quad8_write_preset - }, - { - .name = "set_to_preset_on_index", - .shared = IIO_SEPARATE, - .read = quad8_read_set_to_preset_on_index, - .write = quad8_write_set_to_preset_on_index - }, - IIO_ENUM("noise_error", IIO_SEPARATE, &quad8_noise_error_enum), - IIO_ENUM_AVAILABLE("noise_error", &quad8_noise_error_enum), - IIO_ENUM("count_direction", IIO_SEPARATE, &quad8_count_direction_enum), - IIO_ENUM_AVAILABLE("count_direction", &quad8_count_direction_enum), - IIO_ENUM("count_mode", IIO_SEPARATE, &quad8_count_mode_enum), - IIO_ENUM_AVAILABLE("count_mode", &quad8_count_mode_enum), - IIO_ENUM("quadrature_mode", IIO_SEPARATE, &quad8_quadrature_mode_enum), - IIO_ENUM_AVAILABLE("quadrature_mode", &quad8_quadrature_mode_enum), - {} -}; - -static const struct iio_chan_spec_ext_info quad8_index_ext_info[] = { - IIO_ENUM("synchronous_mode", IIO_SEPARATE, - &quad8_synchronous_mode_enum), - IIO_ENUM_AVAILABLE("synchronous_mode", &quad8_synchronous_mode_enum), - IIO_ENUM("index_polarity", IIO_SEPARATE, &quad8_index_polarity_enum), - IIO_ENUM_AVAILABLE("index_polarity", &quad8_index_polarity_enum), - {} -}; - -#define QUAD8_COUNT_CHAN(_chan) { \ - .type = IIO_COUNT, \ - .channel = (_chan), \ - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ - BIT(IIO_CHAN_INFO_ENABLE) | BIT(IIO_CHAN_INFO_SCALE), \ - .ext_info = quad8_count_ext_info, \ - .indexed = 1 \ -} - -#define QUAD8_INDEX_CHAN(_chan) { \ - .type = IIO_INDEX, \ - .channel = (_chan), \ - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ - .ext_info = quad8_index_ext_info, \ - .indexed = 1 \ -} - -static const struct iio_chan_spec quad8_channels[] = { - QUAD8_COUNT_CHAN(0), QUAD8_INDEX_CHAN(0), - QUAD8_COUNT_CHAN(1), QUAD8_INDEX_CHAN(1), - QUAD8_COUNT_CHAN(2), QUAD8_INDEX_CHAN(2), - QUAD8_COUNT_CHAN(3), QUAD8_INDEX_CHAN(3), - QUAD8_COUNT_CHAN(4), QUAD8_INDEX_CHAN(4), - QUAD8_COUNT_CHAN(5), QUAD8_INDEX_CHAN(5), - QUAD8_COUNT_CHAN(6), QUAD8_INDEX_CHAN(6), - QUAD8_COUNT_CHAN(7), QUAD8_INDEX_CHAN(7) -}; - static int quad8_signal_read(struct counter_device *counter, - struct counter_signal *signal, enum counter_signal_value *val) + struct counter_signal *signal, + enum counter_signal_level *level) { - const struct quad8_iio *const priv = counter->priv; + const struct quad8 *const priv = counter_priv(counter); unsigned int state; /* Only Index signal levels can be read */ if (signal->id < 16) return -EINVAL; - state = inb(priv->base + QUAD8_REG_INDEX_INPUT_LEVELS) - & BIT(signal->id - 16); + state = ioread8(&priv->reg->index_input_levels) & BIT(signal->id - 16); - *val = (state) ? COUNTER_SIGNAL_HIGH : COUNTER_SIGNAL_LOW; + *level = (state) ? COUNTER_SIGNAL_LEVEL_HIGH : COUNTER_SIGNAL_LEVEL_LOW; return 0; } static int quad8_count_read(struct counter_device *counter, - struct counter_count *count, unsigned long *val) + struct counter_count *count, u64 *val) { - const struct quad8_iio *const priv = counter->priv; - const int base_offset = priv->base + 2 * count->id; + struct quad8 *const priv = counter_priv(counter); + struct channel_reg __iomem *const chan = priv->reg->channel + count->id; unsigned int flags; unsigned int borrow; unsigned int carry; + unsigned long irqflags; int i; - flags = inb(base_offset + 1); + flags = ioread8(&chan->control); borrow = flags & QUAD8_FLAG_BT; carry = !!(flags & QUAD8_FLAG_CT); /* Borrow XOR Carry effectively doubles count range */ *val = (unsigned long)(borrow ^ carry) << 24; + spin_lock_irqsave(&priv->lock, irqflags); + /* Reset Byte Pointer; transfer Counter to Output Latch */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT, - base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT, + &chan->control); for (i = 0; i < 3; i++) - *val |= (unsigned long)inb(base_offset) << (8 * i); + *val |= (unsigned long)ioread8(&chan->data) << (8 * i); + + spin_unlock_irqrestore(&priv->lock, irqflags); return 0; } static int quad8_count_write(struct counter_device *counter, - struct counter_count *count, unsigned long val) + struct counter_count *count, u64 val) { - const struct quad8_iio *const priv = counter->priv; - const int base_offset = priv->base + 2 * count->id; + struct quad8 *const priv = counter_priv(counter); + struct channel_reg __iomem *const chan = priv->reg->channel + count->id; + unsigned long irqflags; int i; /* Only 24-bit values are supported */ if (val > 0xFFFFFF) - return -EINVAL; + return -ERANGE; + + spin_lock_irqsave(&priv->lock, irqflags); /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); /* Counter can only be set via Preset Register */ for (i = 0; i < 3; i++) - outb(val >> (8 * i), base_offset); + iowrite8(val >> (8 * i), &chan->data); /* Transfer Preset Register to Counter */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, &chan->control); /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); /* Set Preset Register back to original value */ val = priv->preset[count->id]; for (i = 0; i < 3; i++) - outb(val >> (8 * i), base_offset); + iowrite8(val >> (8 * i), &chan->data); /* Reset Borrow, Carry, Compare, and Sign flags */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, &chan->control); /* Reset Error flag */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, &chan->control); + + spin_unlock_irqrestore(&priv->lock, irqflags); return 0; } -enum quad8_count_function { - QUAD8_COUNT_FUNCTION_PULSE_DIRECTION = 0, - QUAD8_COUNT_FUNCTION_QUADRATURE_X1, - QUAD8_COUNT_FUNCTION_QUADRATURE_X2, - QUAD8_COUNT_FUNCTION_QUADRATURE_X4 +static const enum counter_function quad8_count_functions_list[] = { + COUNTER_FUNCTION_PULSE_DIRECTION, + COUNTER_FUNCTION_QUADRATURE_X1_A, + COUNTER_FUNCTION_QUADRATURE_X2_A, + COUNTER_FUNCTION_QUADRATURE_X4, }; -static enum counter_count_function quad8_count_functions_list[] = { - [QUAD8_COUNT_FUNCTION_PULSE_DIRECTION] = COUNTER_COUNT_FUNCTION_PULSE_DIRECTION, - [QUAD8_COUNT_FUNCTION_QUADRATURE_X1] = COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A, - [QUAD8_COUNT_FUNCTION_QUADRATURE_X2] = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A, - [QUAD8_COUNT_FUNCTION_QUADRATURE_X4] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4 -}; +static int quad8_function_get(const struct quad8 *const priv, const size_t id, + enum counter_function *const function) +{ + if (!priv->quadrature_mode[id]) { + *function = COUNTER_FUNCTION_PULSE_DIRECTION; + return 0; + } + + switch (priv->quadrature_scale[id]) { + case 0: + *function = COUNTER_FUNCTION_QUADRATURE_X1_A; + return 0; + case 1: + *function = COUNTER_FUNCTION_QUADRATURE_X2_A; + return 0; + case 2: + *function = COUNTER_FUNCTION_QUADRATURE_X4; + return 0; + default: + /* should never reach this path */ + return -EINVAL; + } +} -static int quad8_function_get(struct counter_device *counter, - struct counter_count *count, size_t *function) +static int quad8_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) { - const struct quad8_iio *const priv = counter->priv; - const int id = count->id; - const unsigned int quadrature_mode = priv->quadrature_mode[id]; - const unsigned int scale = priv->quadrature_scale[id]; + struct quad8 *const priv = counter_priv(counter); + unsigned long irqflags; + int retval; - if (quadrature_mode) - switch (scale) { - case 0: - *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X1; - break; - case 1: - *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X2; - break; - case 2: - *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X4; - break; - } - else - *function = QUAD8_COUNT_FUNCTION_PULSE_DIRECTION; + spin_lock_irqsave(&priv->lock, irqflags); - return 0; + retval = quad8_function_get(priv, count->id, function); + + spin_unlock_irqrestore(&priv->lock, irqflags); + + return retval; } -static int quad8_function_set(struct counter_device *counter, - struct counter_count *count, size_t function) +static int quad8_function_write(struct counter_device *counter, + struct counter_count *count, + enum counter_function function) { - struct quad8_iio *const priv = counter->priv; + struct quad8 *const priv = counter_priv(counter); const int id = count->id; unsigned int *const quadrature_mode = priv->quadrature_mode + id; unsigned int *const scale = priv->quadrature_scale + id; - unsigned int mode_cfg = priv->count_mode[id] << 1; unsigned int *const synchronous_mode = priv->synchronous_mode + id; - const unsigned int idr_cfg = priv->index_polarity[id] << 1; - const int base_offset = priv->base + 2 * id + 1; + u8 __iomem *const control = &priv->reg->channel[id].control; + unsigned long irqflags; + unsigned int mode_cfg; + unsigned int idr_cfg; - if (function == QUAD8_COUNT_FUNCTION_PULSE_DIRECTION) { + spin_lock_irqsave(&priv->lock, irqflags); + + mode_cfg = priv->count_mode[id] << 1; + idr_cfg = priv->index_polarity[id] << 1; + + if (function == COUNTER_FUNCTION_PULSE_DIRECTION) { *quadrature_mode = 0; /* Quadrature scaling only available in quadrature mode */ @@ -705,134 +302,243 @@ static int quad8_function_set(struct counter_device *counter, if (*synchronous_mode) { *synchronous_mode = 0; /* Disable synchronous function mode */ - outb(QUAD8_CTR_IDR | idr_cfg, base_offset); + iowrite8(QUAD8_CTR_IDR | idr_cfg, control); } } else { *quadrature_mode = 1; switch (function) { - case QUAD8_COUNT_FUNCTION_QUADRATURE_X1: + case COUNTER_FUNCTION_QUADRATURE_X1_A: *scale = 0; mode_cfg |= QUAD8_CMR_QUADRATURE_X1; break; - case QUAD8_COUNT_FUNCTION_QUADRATURE_X2: + case COUNTER_FUNCTION_QUADRATURE_X2_A: *scale = 1; mode_cfg |= QUAD8_CMR_QUADRATURE_X2; break; - case QUAD8_COUNT_FUNCTION_QUADRATURE_X4: + case COUNTER_FUNCTION_QUADRATURE_X4: *scale = 2; mode_cfg |= QUAD8_CMR_QUADRATURE_X4; break; + default: + /* should never reach this path */ + spin_unlock_irqrestore(&priv->lock, irqflags); + return -EINVAL; } } /* Load mode configuration to Counter Mode Register */ - outb(QUAD8_CTR_CMR | mode_cfg, base_offset); + iowrite8(QUAD8_CTR_CMR | mode_cfg, control); + + spin_unlock_irqrestore(&priv->lock, irqflags); return 0; } -static void quad8_direction_get(struct counter_device *counter, - struct counter_count *count, enum counter_count_direction *direction) +static int quad8_direction_read(struct counter_device *counter, + struct counter_count *count, + enum counter_count_direction *direction) { - const struct quad8_iio *const priv = counter->priv; + const struct quad8 *const priv = counter_priv(counter); unsigned int ud_flag; - const unsigned int flag_addr = priv->base + 2 * count->id + 1; + u8 __iomem *const flag_addr = &priv->reg->channel[count->id].control; /* U/D flag: nonzero = up, zero = down */ - ud_flag = inb(flag_addr) & QUAD8_FLAG_UD; + ud_flag = ioread8(flag_addr) & QUAD8_FLAG_UD; *direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD : COUNTER_COUNT_DIRECTION_BACKWARD; -} -enum quad8_synapse_action { - QUAD8_SYNAPSE_ACTION_NONE = 0, - QUAD8_SYNAPSE_ACTION_RISING_EDGE, - QUAD8_SYNAPSE_ACTION_FALLING_EDGE, - QUAD8_SYNAPSE_ACTION_BOTH_EDGES -}; + return 0; +} -static enum counter_synapse_action quad8_index_actions_list[] = { - [QUAD8_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE, - [QUAD8_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE +static const enum counter_synapse_action quad8_index_actions_list[] = { + COUNTER_SYNAPSE_ACTION_NONE, + COUNTER_SYNAPSE_ACTION_RISING_EDGE, }; -static enum counter_synapse_action quad8_synapse_actions_list[] = { - [QUAD8_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE, - [QUAD8_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE, - [QUAD8_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE, - [QUAD8_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES +static const enum counter_synapse_action quad8_synapse_actions_list[] = { + COUNTER_SYNAPSE_ACTION_NONE, + COUNTER_SYNAPSE_ACTION_RISING_EDGE, + COUNTER_SYNAPSE_ACTION_FALLING_EDGE, + COUNTER_SYNAPSE_ACTION_BOTH_EDGES, }; -static int quad8_action_get(struct counter_device *counter, - struct counter_count *count, struct counter_synapse *synapse, - size_t *action) +static int quad8_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) { - struct quad8_iio *const priv = counter->priv; + struct quad8 *const priv = counter_priv(counter); + unsigned long irqflags; int err; - size_t function = 0; + enum counter_function function; const size_t signal_a_id = count->synapses[0].signal->id; enum counter_count_direction direction; /* Handle Index signals */ if (synapse->signal->id >= 16) { if (priv->preset_enable[count->id]) - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE; + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; else - *action = QUAD8_SYNAPSE_ACTION_NONE; + *action = COUNTER_SYNAPSE_ACTION_NONE; return 0; } - err = quad8_function_get(counter, count, &function); - if (err) + spin_lock_irqsave(&priv->lock, irqflags); + + /* Get Count function and direction atomically */ + err = quad8_function_get(priv, count->id, &function); + if (err) { + spin_unlock_irqrestore(&priv->lock, irqflags); return err; + } + err = quad8_direction_read(counter, count, &direction); + if (err) { + spin_unlock_irqrestore(&priv->lock, irqflags); + return err; + } + + spin_unlock_irqrestore(&priv->lock, irqflags); /* Default action mode */ - *action = QUAD8_SYNAPSE_ACTION_NONE; + *action = COUNTER_SYNAPSE_ACTION_NONE; /* Determine action mode based on current count function mode */ switch (function) { - case QUAD8_COUNT_FUNCTION_PULSE_DIRECTION: + case COUNTER_FUNCTION_PULSE_DIRECTION: if (synapse->signal->id == signal_a_id) - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE; - break; - case QUAD8_COUNT_FUNCTION_QUADRATURE_X1: + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; + return 0; + case COUNTER_FUNCTION_QUADRATURE_X1_A: if (synapse->signal->id == signal_a_id) { - quad8_direction_get(counter, count, &direction); - if (direction == COUNTER_COUNT_DIRECTION_FORWARD) - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE; + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; else - *action = QUAD8_SYNAPSE_ACTION_FALLING_EDGE; + *action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE; } - break; - case QUAD8_COUNT_FUNCTION_QUADRATURE_X2: + return 0; + case COUNTER_FUNCTION_QUADRATURE_X2_A: if (synapse->signal->id == signal_a_id) - *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES; - break; - case QUAD8_COUNT_FUNCTION_QUADRATURE_X4: - *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES; - break; + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + return 0; + case COUNTER_FUNCTION_QUADRATURE_X4: + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + return 0; + default: + /* should never reach this path */ + return -EINVAL; } +} + +enum { + QUAD8_EVENT_CARRY = 0, + QUAD8_EVENT_COMPARE = 1, + QUAD8_EVENT_CARRY_BORROW = 2, + QUAD8_EVENT_INDEX = 3, +}; + +static int quad8_events_configure(struct counter_device *counter) +{ + struct quad8 *const priv = counter_priv(counter); + unsigned long irq_enabled = 0; + unsigned long irqflags; + struct counter_event_node *event_node; + unsigned int next_irq_trigger; + unsigned long ior_cfg; + + spin_lock_irqsave(&priv->lock, irqflags); + + list_for_each_entry(event_node, &counter->events_list, l) { + switch (event_node->event) { + case COUNTER_EVENT_OVERFLOW: + next_irq_trigger = QUAD8_EVENT_CARRY; + break; + case COUNTER_EVENT_THRESHOLD: + next_irq_trigger = QUAD8_EVENT_COMPARE; + break; + case COUNTER_EVENT_OVERFLOW_UNDERFLOW: + next_irq_trigger = QUAD8_EVENT_CARRY_BORROW; + break; + case COUNTER_EVENT_INDEX: + next_irq_trigger = QUAD8_EVENT_INDEX; + break; + default: + /* should never reach this path */ + spin_unlock_irqrestore(&priv->lock, irqflags); + return -EINVAL; + } + + /* Enable IRQ line */ + irq_enabled |= BIT(event_node->channel); + + /* Skip configuration if it is the same as previously set */ + if (priv->irq_trigger[event_node->channel] == next_irq_trigger) + continue; + + /* Save new IRQ function configuration */ + priv->irq_trigger[event_node->channel] = next_irq_trigger; + + /* Load configuration to I/O Control Register */ + ior_cfg = priv->ab_enable[event_node->channel] | + priv->preset_enable[event_node->channel] << 1 | + priv->irq_trigger[event_node->channel] << 3; + iowrite8(QUAD8_CTR_IOR | ior_cfg, + &priv->reg->channel[event_node->channel].control); + } + + iowrite8(irq_enabled, &priv->reg->index_interrupt); + + spin_unlock_irqrestore(&priv->lock, irqflags); return 0; } +static int quad8_watch_validate(struct counter_device *counter, + const struct counter_watch *watch) +{ + struct counter_event_node *event_node; + + if (watch->channel > QUAD8_NUM_COUNTERS - 1) + return -EINVAL; + + switch (watch->event) { + case COUNTER_EVENT_OVERFLOW: + case COUNTER_EVENT_THRESHOLD: + case COUNTER_EVENT_OVERFLOW_UNDERFLOW: + case COUNTER_EVENT_INDEX: + list_for_each_entry(event_node, &counter->next_events_list, l) + if (watch->channel == event_node->channel && + watch->event != event_node->event) + return -EINVAL; + return 0; + default: + return -EINVAL; + } +} + static const struct counter_ops quad8_ops = { .signal_read = quad8_signal_read, .count_read = quad8_count_read, .count_write = quad8_count_write, - .function_get = quad8_function_get, - .function_set = quad8_function_set, - .action_get = quad8_action_get + .function_read = quad8_function_read, + .function_write = quad8_function_write, + .action_read = quad8_action_read, + .events_configure = quad8_events_configure, + .watch_validate = quad8_watch_validate, +}; + +static const char *const quad8_index_polarity_modes[] = { + "negative", + "positive" }; static int quad8_index_polarity_get(struct counter_device *counter, - struct counter_signal *signal, size_t *index_polarity) + struct counter_signal *signal, + u32 *index_polarity) { - const struct quad8_iio *const priv = counter->priv; + const struct quad8 *const priv = counter_priv(counter); const size_t channel_id = signal->id - 16; *index_polarity = priv->index_polarity[channel_id]; @@ -841,33 +547,65 @@ static int quad8_index_polarity_get(struct counter_device *counter, } static int quad8_index_polarity_set(struct counter_device *counter, - struct counter_signal *signal, size_t index_polarity) + struct counter_signal *signal, + u32 index_polarity) { - struct quad8_iio *const priv = counter->priv; + struct quad8 *const priv = counter_priv(counter); const size_t channel_id = signal->id - 16; - const unsigned int idr_cfg = priv->synchronous_mode[channel_id] | - index_polarity << 1; - const int base_offset = priv->base + 2 * channel_id + 1; + u8 __iomem *const control = &priv->reg->channel[channel_id].control; + unsigned long irqflags; + unsigned int idr_cfg = index_polarity << 1; + + spin_lock_irqsave(&priv->lock, irqflags); + + idr_cfg |= priv->synchronous_mode[channel_id]; priv->index_polarity[channel_id] = index_polarity; /* Load Index Control configuration to Index Control Register */ - outb(QUAD8_CTR_IDR | idr_cfg, base_offset); + iowrite8(QUAD8_CTR_IDR | idr_cfg, control); + + spin_unlock_irqrestore(&priv->lock, irqflags); return 0; } -static struct counter_signal_enum_ext quad8_index_pol_enum = { - .items = quad8_index_polarity_modes, - .num_items = ARRAY_SIZE(quad8_index_polarity_modes), - .get = quad8_index_polarity_get, - .set = quad8_index_polarity_set +static int quad8_polarity_read(struct counter_device *counter, + struct counter_signal *signal, + enum counter_signal_polarity *polarity) +{ + int err; + u32 index_polarity; + + err = quad8_index_polarity_get(counter, signal, &index_polarity); + if (err) + return err; + + *polarity = (index_polarity) ? COUNTER_SIGNAL_POLARITY_POSITIVE : + COUNTER_SIGNAL_POLARITY_NEGATIVE; + + return 0; +} + +static int quad8_polarity_write(struct counter_device *counter, + struct counter_signal *signal, + enum counter_signal_polarity polarity) +{ + const u32 pol = (polarity == COUNTER_SIGNAL_POLARITY_POSITIVE) ? 1 : 0; + + return quad8_index_polarity_set(counter, signal, pol); +} + +static const char *const quad8_synchronous_modes[] = { + "non-synchronous", + "synchronous" }; static int quad8_synchronous_mode_get(struct counter_device *counter, - struct counter_signal *signal, size_t *synchronous_mode) + struct counter_signal *signal, + u32 *synchronous_mode) { - const struct quad8_iio *const priv = counter->priv; + const struct quad8 *const priv = counter_priv(counter); const size_t channel_id = signal->id - 16; *synchronous_mode = priv->synchronous_mode[channel_id]; @@ -876,44 +614,49 @@ static int quad8_synchronous_mode_get(struct counter_device *counter, } static int quad8_synchronous_mode_set(struct counter_device *counter, - struct counter_signal *signal, size_t synchronous_mode) + struct counter_signal *signal, + u32 synchronous_mode) { - struct quad8_iio *const priv = counter->priv; + struct quad8 *const priv = counter_priv(counter); const size_t channel_id = signal->id - 16; - const unsigned int idr_cfg = synchronous_mode | - priv->index_polarity[channel_id] << 1; - const int base_offset = priv->base + 2 * channel_id + 1; + u8 __iomem *const control = &priv->reg->channel[channel_id].control; + unsigned long irqflags; + unsigned int idr_cfg = synchronous_mode; + + spin_lock_irqsave(&priv->lock, irqflags); + + idr_cfg |= priv->index_polarity[channel_id] << 1; /* Index function must be non-synchronous in non-quadrature mode */ - if (synchronous_mode && !priv->quadrature_mode[channel_id]) + if (synchronous_mode && !priv->quadrature_mode[channel_id]) { + spin_unlock_irqrestore(&priv->lock, irqflags); return -EINVAL; + } priv->synchronous_mode[channel_id] = synchronous_mode; /* Load Index Control configuration to Index Control Register */ - outb(QUAD8_CTR_IDR | idr_cfg, base_offset); + iowrite8(QUAD8_CTR_IDR | idr_cfg, control); + + spin_unlock_irqrestore(&priv->lock, irqflags); return 0; } -static struct counter_signal_enum_ext quad8_syn_mode_enum = { - .items = quad8_synchronous_modes, - .num_items = ARRAY_SIZE(quad8_synchronous_modes), - .get = quad8_synchronous_mode_get, - .set = quad8_synchronous_mode_set -}; - -static ssize_t quad8_count_floor_read(struct counter_device *counter, - struct counter_count *count, void *private, char *buf) +static int quad8_count_floor_read(struct counter_device *counter, + struct counter_count *count, u64 *floor) { /* Only a floor of 0 is supported */ - return sprintf(buf, "0\n"); + *floor = 0; + + return 0; } -static int quad8_count_mode_get(struct counter_device *counter, - struct counter_count *count, size_t *cnt_mode) +static int quad8_count_mode_read(struct counter_device *counter, + struct counter_count *count, + enum counter_count_mode *cnt_mode) { - const struct quad8_iio *const priv = counter->priv; + const struct quad8 *const priv = counter_priv(counter); /* Map 104-QUAD-8 count mode to Generic Counter count mode */ switch (priv->count_mode[count->id]) { @@ -934,222 +677,379 @@ static int quad8_count_mode_get(struct counter_device *counter, return 0; } -static int quad8_count_mode_set(struct counter_device *counter, - struct counter_count *count, size_t cnt_mode) +static int quad8_count_mode_write(struct counter_device *counter, + struct counter_count *count, + enum counter_count_mode cnt_mode) { - struct quad8_iio *const priv = counter->priv; + struct quad8 *const priv = counter_priv(counter); + unsigned int count_mode; unsigned int mode_cfg; - const int base_offset = priv->base + 2 * count->id + 1; + u8 __iomem *const control = &priv->reg->channel[count->id].control; + unsigned long irqflags; /* Map Generic Counter count mode to 104-QUAD-8 count mode */ switch (cnt_mode) { case COUNTER_COUNT_MODE_NORMAL: - cnt_mode = 0; + count_mode = 0; break; case COUNTER_COUNT_MODE_RANGE_LIMIT: - cnt_mode = 1; + count_mode = 1; break; case COUNTER_COUNT_MODE_NON_RECYCLE: - cnt_mode = 2; + count_mode = 2; break; case COUNTER_COUNT_MODE_MODULO_N: - cnt_mode = 3; + count_mode = 3; break; + default: + /* should never reach this path */ + return -EINVAL; } - priv->count_mode[count->id] = cnt_mode; + spin_lock_irqsave(&priv->lock, irqflags); + + priv->count_mode[count->id] = count_mode; /* Set count mode configuration value */ - mode_cfg = cnt_mode << 1; + mode_cfg = count_mode << 1; /* Add quadrature mode configuration */ if (priv->quadrature_mode[count->id]) mode_cfg |= (priv->quadrature_scale[count->id] + 1) << 3; /* Load mode configuration to Counter Mode Register */ - outb(QUAD8_CTR_CMR | mode_cfg, base_offset); + iowrite8(QUAD8_CTR_CMR | mode_cfg, control); + + spin_unlock_irqrestore(&priv->lock, irqflags); return 0; } -static struct counter_count_enum_ext quad8_cnt_mode_enum = { - .items = counter_count_mode_str, - .num_items = ARRAY_SIZE(counter_count_mode_str), - .get = quad8_count_mode_get, - .set = quad8_count_mode_set -}; - -static ssize_t quad8_count_direction_read(struct counter_device *counter, - struct counter_count *count, void *priv, char *buf) +static int quad8_count_enable_read(struct counter_device *counter, + struct counter_count *count, u8 *enable) { - enum counter_count_direction dir; - - quad8_direction_get(counter, count, &dir); + const struct quad8 *const priv = counter_priv(counter); - return sprintf(buf, "%s\n", counter_count_direction_str[dir]); -} - -static ssize_t quad8_count_enable_read(struct counter_device *counter, - struct counter_count *count, void *private, char *buf) -{ - const struct quad8_iio *const priv = counter->priv; + *enable = priv->ab_enable[count->id]; - return sprintf(buf, "%u\n", priv->ab_enable[count->id]); + return 0; } -static ssize_t quad8_count_enable_write(struct counter_device *counter, - struct counter_count *count, void *private, const char *buf, size_t len) +static int quad8_count_enable_write(struct counter_device *counter, + struct counter_count *count, u8 enable) { - struct quad8_iio *const priv = counter->priv; - const int base_offset = priv->base + 2 * count->id; - int err; - bool ab_enable; + struct quad8 *const priv = counter_priv(counter); + u8 __iomem *const control = &priv->reg->channel[count->id].control; + unsigned long irqflags; unsigned int ior_cfg; - err = kstrtobool(buf, &ab_enable); - if (err) - return err; + spin_lock_irqsave(&priv->lock, irqflags); - priv->ab_enable[count->id] = ab_enable; + priv->ab_enable[count->id] = enable; - ior_cfg = ab_enable | priv->preset_enable[count->id] << 1; + ior_cfg = enable | priv->preset_enable[count->id] << 1 | + priv->irq_trigger[count->id] << 3; /* Load I/O control configuration */ - outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1); + iowrite8(QUAD8_CTR_IOR | ior_cfg, control); - return len; + spin_unlock_irqrestore(&priv->lock, irqflags); + + return 0; } +static const char *const quad8_noise_error_states[] = { + "No excessive noise is present at the count inputs", + "Excessive noise is present at the count inputs" +}; + static int quad8_error_noise_get(struct counter_device *counter, - struct counter_count *count, size_t *noise_error) + struct counter_count *count, u32 *noise_error) { - const struct quad8_iio *const priv = counter->priv; - const int base_offset = priv->base + 2 * count->id + 1; + const struct quad8 *const priv = counter_priv(counter); + u8 __iomem *const flag_addr = &priv->reg->channel[count->id].control; - *noise_error = !!(inb(base_offset) & QUAD8_FLAG_E); + *noise_error = !!(ioread8(flag_addr) & QUAD8_FLAG_E); return 0; } -static struct counter_count_enum_ext quad8_error_noise_enum = { - .items = quad8_noise_error_states, - .num_items = ARRAY_SIZE(quad8_noise_error_states), - .get = quad8_error_noise_get -}; - -static ssize_t quad8_count_preset_read(struct counter_device *counter, - struct counter_count *count, void *private, char *buf) +static int quad8_count_preset_read(struct counter_device *counter, + struct counter_count *count, u64 *preset) { - const struct quad8_iio *const priv = counter->priv; + const struct quad8 *const priv = counter_priv(counter); + + *preset = priv->preset[count->id]; - return sprintf(buf, "%u\n", priv->preset[count->id]); + return 0; } -static ssize_t quad8_count_preset_write(struct counter_device *counter, - struct counter_count *count, void *private, const char *buf, size_t len) +static void quad8_preset_register_set(struct quad8 *const priv, const int id, + const unsigned int preset) { - struct quad8_iio *const priv = counter->priv; - const int base_offset = priv->base + 2 * count->id; - unsigned int preset; - int ret; + struct channel_reg __iomem *const chan = priv->reg->channel + id; int i; - ret = kstrtouint(buf, 0, &preset); - if (ret) - return ret; + priv->preset[id] = preset; + + /* Reset Byte Pointer */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); + + /* Set Preset Register */ + for (i = 0; i < 3; i++) + iowrite8(preset >> (8 * i), &chan->data); +} + +static int quad8_count_preset_write(struct counter_device *counter, + struct counter_count *count, u64 preset) +{ + struct quad8 *const priv = counter_priv(counter); + unsigned long irqflags; /* Only 24-bit values are supported */ if (preset > 0xFFFFFF) - return -EINVAL; + return -ERANGE; - priv->preset[count->id] = preset; + spin_lock_irqsave(&priv->lock, irqflags); - /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + quad8_preset_register_set(priv, count->id, preset); - /* Set Preset Register */ - for (i = 0; i < 3; i++) - outb(preset >> (8 * i), base_offset); + spin_unlock_irqrestore(&priv->lock, irqflags); - return len; + return 0; } -static ssize_t quad8_count_ceiling_read(struct counter_device *counter, - struct counter_count *count, void *private, char *buf) +static int quad8_count_ceiling_read(struct counter_device *counter, + struct counter_count *count, u64 *ceiling) { - const struct quad8_iio *const priv = counter->priv; + struct quad8 *const priv = counter_priv(counter); + unsigned long irqflags; + + spin_lock_irqsave(&priv->lock, irqflags); /* Range Limit and Modulo-N count modes use preset value as ceiling */ switch (priv->count_mode[count->id]) { case 1: case 3: - return quad8_count_preset_read(counter, count, private, buf); + *ceiling = priv->preset[count->id]; + break; + default: + /* By default 0x1FFFFFF (25 bits unsigned) is maximum count */ + *ceiling = 0x1FFFFFF; + break; } - /* By default 0x1FFFFFF (25 bits unsigned) is maximum count */ - return sprintf(buf, "33554431\n"); + spin_unlock_irqrestore(&priv->lock, irqflags); + + return 0; } -static ssize_t quad8_count_ceiling_write(struct counter_device *counter, - struct counter_count *count, void *private, const char *buf, size_t len) +static int quad8_count_ceiling_write(struct counter_device *counter, + struct counter_count *count, u64 ceiling) { - struct quad8_iio *const priv = counter->priv; + struct quad8 *const priv = counter_priv(counter); + unsigned long irqflags; + + /* Only 24-bit values are supported */ + if (ceiling > 0xFFFFFF) + return -ERANGE; + + spin_lock_irqsave(&priv->lock, irqflags); /* Range Limit and Modulo-N count modes use preset value as ceiling */ switch (priv->count_mode[count->id]) { case 1: case 3: - return quad8_count_preset_write(counter, count, private, buf, - len); + quad8_preset_register_set(priv, count->id, ceiling); + spin_unlock_irqrestore(&priv->lock, irqflags); + return 0; } - return len; + spin_unlock_irqrestore(&priv->lock, irqflags); + + return -EINVAL; } -static ssize_t quad8_count_preset_enable_read(struct counter_device *counter, - struct counter_count *count, void *private, char *buf) +static int quad8_count_preset_enable_read(struct counter_device *counter, + struct counter_count *count, + u8 *preset_enable) { - const struct quad8_iio *const priv = counter->priv; + const struct quad8 *const priv = counter_priv(counter); + + *preset_enable = !priv->preset_enable[count->id]; - return sprintf(buf, "%u\n", !priv->preset_enable[count->id]); + return 0; } -static ssize_t quad8_count_preset_enable_write(struct counter_device *counter, - struct counter_count *count, void *private, const char *buf, size_t len) +static int quad8_count_preset_enable_write(struct counter_device *counter, + struct counter_count *count, + u8 preset_enable) { - struct quad8_iio *const priv = counter->priv; - const int base_offset = priv->base + 2 * count->id + 1; - bool preset_enable; - int ret; + struct quad8 *const priv = counter_priv(counter); + u8 __iomem *const control = &priv->reg->channel[count->id].control; + unsigned long irqflags; unsigned int ior_cfg; - ret = kstrtobool(buf, &preset_enable); - if (ret) - return ret; - /* Preset enable is active low in Input/Output Control register */ preset_enable = !preset_enable; + spin_lock_irqsave(&priv->lock, irqflags); + priv->preset_enable[count->id] = preset_enable; - ior_cfg = priv->ab_enable[count->id] | (unsigned int)preset_enable << 1; + ior_cfg = priv->ab_enable[count->id] | preset_enable << 1 | + priv->irq_trigger[count->id] << 3; /* Load I/O control configuration to Input / Output Control Register */ - outb(QUAD8_CTR_IOR | ior_cfg, base_offset); + iowrite8(QUAD8_CTR_IOR | ior_cfg, control); + + spin_unlock_irqrestore(&priv->lock, irqflags); + + return 0; +} + +static int quad8_signal_cable_fault_read(struct counter_device *counter, + struct counter_signal *signal, + u8 *cable_fault) +{ + struct quad8 *const priv = counter_priv(counter); + const size_t channel_id = signal->id / 2; + unsigned long irqflags; + bool disabled; + unsigned int status; + + spin_lock_irqsave(&priv->lock, irqflags); + + disabled = !(priv->cable_fault_enable & BIT(channel_id)); + + if (disabled) { + spin_unlock_irqrestore(&priv->lock, irqflags); + return -EINVAL; + } + + /* Logic 0 = cable fault */ + status = ioread8(&priv->reg->cable_status); + + spin_unlock_irqrestore(&priv->lock, irqflags); + + /* Mask respective channel and invert logic */ + *cable_fault = !(status & BIT(channel_id)); + + return 0; +} + +static int quad8_signal_cable_fault_enable_read(struct counter_device *counter, + struct counter_signal *signal, + u8 *enable) +{ + const struct quad8 *const priv = counter_priv(counter); + const size_t channel_id = signal->id / 2; + + *enable = !!(priv->cable_fault_enable & BIT(channel_id)); + + return 0; +} + +static int quad8_signal_cable_fault_enable_write(struct counter_device *counter, + struct counter_signal *signal, + u8 enable) +{ + struct quad8 *const priv = counter_priv(counter); + const size_t channel_id = signal->id / 2; + unsigned long irqflags; + unsigned int cable_fault_enable; + + spin_lock_irqsave(&priv->lock, irqflags); + + if (enable) + priv->cable_fault_enable |= BIT(channel_id); + else + priv->cable_fault_enable &= ~BIT(channel_id); + + /* Enable is active low in Differential Encoder Cable Status register */ + cable_fault_enable = ~priv->cable_fault_enable; - return len; + iowrite8(cable_fault_enable, &priv->reg->cable_status); + + spin_unlock_irqrestore(&priv->lock, irqflags); + + return 0; } -static const struct counter_signal_ext quad8_index_ext[] = { - COUNTER_SIGNAL_ENUM("index_polarity", &quad8_index_pol_enum), - COUNTER_SIGNAL_ENUM_AVAILABLE("index_polarity", &quad8_index_pol_enum), - COUNTER_SIGNAL_ENUM("synchronous_mode", &quad8_syn_mode_enum), - COUNTER_SIGNAL_ENUM_AVAILABLE("synchronous_mode", &quad8_syn_mode_enum) +static int quad8_signal_fck_prescaler_read(struct counter_device *counter, + struct counter_signal *signal, + u8 *prescaler) +{ + const struct quad8 *const priv = counter_priv(counter); + + *prescaler = priv->fck_prescaler[signal->id / 2]; + + return 0; +} + +static int quad8_signal_fck_prescaler_write(struct counter_device *counter, + struct counter_signal *signal, + u8 prescaler) +{ + struct quad8 *const priv = counter_priv(counter); + const size_t channel_id = signal->id / 2; + struct channel_reg __iomem *const chan = priv->reg->channel + channel_id; + unsigned long irqflags; + + spin_lock_irqsave(&priv->lock, irqflags); + + priv->fck_prescaler[channel_id] = prescaler; + + /* Reset Byte Pointer */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); + + /* Set filter clock factor */ + iowrite8(prescaler, &chan->data); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, + &chan->control); + + spin_unlock_irqrestore(&priv->lock, irqflags); + + return 0; +} + +static struct counter_comp quad8_signal_ext[] = { + COUNTER_COMP_SIGNAL_BOOL("cable_fault", quad8_signal_cable_fault_read, + NULL), + COUNTER_COMP_SIGNAL_BOOL("cable_fault_enable", + quad8_signal_cable_fault_enable_read, + quad8_signal_cable_fault_enable_write), + COUNTER_COMP_SIGNAL_U8("filter_clock_prescaler", + quad8_signal_fck_prescaler_read, + quad8_signal_fck_prescaler_write) +}; + +static const enum counter_signal_polarity quad8_polarities[] = { + COUNTER_SIGNAL_POLARITY_POSITIVE, + COUNTER_SIGNAL_POLARITY_NEGATIVE, }; -#define QUAD8_QUAD_SIGNAL(_id, _name) { \ - .id = (_id), \ - .name = (_name) \ +static DEFINE_COUNTER_AVAILABLE(quad8_polarity_available, quad8_polarities); + +static DEFINE_COUNTER_ENUM(quad8_index_pol_enum, quad8_index_polarity_modes); +static DEFINE_COUNTER_ENUM(quad8_synch_mode_enum, quad8_synchronous_modes); + +static struct counter_comp quad8_index_ext[] = { + COUNTER_COMP_SIGNAL_ENUM("index_polarity", quad8_index_polarity_get, + quad8_index_polarity_set, + quad8_index_pol_enum), + COUNTER_COMP_POLARITY(quad8_polarity_read, quad8_polarity_write, + quad8_polarity_available), + COUNTER_COMP_SIGNAL_ENUM("synchronous_mode", quad8_synchronous_mode_get, + quad8_synchronous_mode_set, + quad8_synch_mode_enum), +}; + +#define QUAD8_QUAD_SIGNAL(_id, _name) { \ + .id = (_id), \ + .name = (_name), \ + .ext = quad8_signal_ext, \ + .num_ext = ARRAY_SIZE(quad8_signal_ext) \ } #define QUAD8_INDEX_SIGNAL(_id, _name) { \ @@ -1211,39 +1111,30 @@ static struct counter_synapse quad8_count_synapses[][3] = { QUAD8_COUNT_SYNAPSES(6), QUAD8_COUNT_SYNAPSES(7) }; -static const struct counter_count_ext quad8_count_ext[] = { - { - .name = "ceiling", - .read = quad8_count_ceiling_read, - .write = quad8_count_ceiling_write - }, - { - .name = "floor", - .read = quad8_count_floor_read - }, - COUNTER_COUNT_ENUM("count_mode", &quad8_cnt_mode_enum), - COUNTER_COUNT_ENUM_AVAILABLE("count_mode", &quad8_cnt_mode_enum), - { - .name = "direction", - .read = quad8_count_direction_read - }, - { - .name = "enable", - .read = quad8_count_enable_read, - .write = quad8_count_enable_write - }, - COUNTER_COUNT_ENUM("error_noise", &quad8_error_noise_enum), - COUNTER_COUNT_ENUM_AVAILABLE("error_noise", &quad8_error_noise_enum), - { - .name = "preset", - .read = quad8_count_preset_read, - .write = quad8_count_preset_write - }, - { - .name = "preset_enable", - .read = quad8_count_preset_enable_read, - .write = quad8_count_preset_enable_write - } +static const enum counter_count_mode quad8_cnt_modes[] = { + COUNTER_COUNT_MODE_NORMAL, + COUNTER_COUNT_MODE_RANGE_LIMIT, + COUNTER_COUNT_MODE_NON_RECYCLE, + COUNTER_COUNT_MODE_MODULO_N, +}; + +static DEFINE_COUNTER_AVAILABLE(quad8_count_mode_available, quad8_cnt_modes); + +static DEFINE_COUNTER_ENUM(quad8_error_noise_enum, quad8_noise_error_states); + +static struct counter_comp quad8_count_ext[] = { + COUNTER_COMP_CEILING(quad8_count_ceiling_read, + quad8_count_ceiling_write), + COUNTER_COMP_FLOOR(quad8_count_floor_read, NULL), + COUNTER_COMP_COUNT_MODE(quad8_count_mode_read, quad8_count_mode_write, + quad8_count_mode_available), + COUNTER_COMP_DIRECTION(quad8_direction_read), + COUNTER_COMP_ENABLE(quad8_count_enable_read, quad8_count_enable_write), + COUNTER_COMP_COUNT_ENUM("error_noise", quad8_error_noise_get, NULL, + quad8_error_noise_enum), + COUNTER_COMP_PRESET(quad8_count_preset_read, quad8_count_preset_write), + COUNTER_COMP_PRESET_ENABLE(quad8_count_preset_enable_read, + quad8_count_preset_enable_write), }; #define QUAD8_COUNT(_id, _cntname) { \ @@ -1268,12 +1159,80 @@ static struct counter_count quad8_counts[] = { QUAD8_COUNT(7, "Channel 8 Count") }; +static irqreturn_t quad8_irq_handler(int irq, void *private) +{ + struct counter_device *counter = private; + struct quad8 *const priv = counter_priv(counter); + unsigned long irq_status; + unsigned long channel; + u8 event; + + irq_status = ioread8(&priv->reg->interrupt_status); + if (!irq_status) + return IRQ_NONE; + + for_each_set_bit(channel, &irq_status, QUAD8_NUM_COUNTERS) { + switch (priv->irq_trigger[channel]) { + case QUAD8_EVENT_CARRY: + event = COUNTER_EVENT_OVERFLOW; + break; + case QUAD8_EVENT_COMPARE: + event = COUNTER_EVENT_THRESHOLD; + break; + case QUAD8_EVENT_CARRY_BORROW: + event = COUNTER_EVENT_OVERFLOW_UNDERFLOW; + break; + case QUAD8_EVENT_INDEX: + event = COUNTER_EVENT_INDEX; + break; + default: + /* should never reach this path */ + WARN_ONCE(true, "invalid interrupt trigger function %u configured for channel %lu\n", + priv->irq_trigger[channel], channel); + continue; + } + + counter_push_event(counter, event, channel); + } + + /* Clear pending interrupts on device */ + iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, &priv->reg->channel_oper); + + return IRQ_HANDLED; +} + +static void quad8_init_counter(struct channel_reg __iomem *const chan) +{ + unsigned long i; + + /* Reset Byte Pointer */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); + /* Reset filter clock factor */ + iowrite8(0, &chan->data); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, + &chan->control); + /* Reset Byte Pointer */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); + /* Reset Preset Register */ + for (i = 0; i < 3; i++) + iowrite8(0x00, &chan->data); + /* Reset Borrow, Carry, Compare, and Sign flags */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, &chan->control); + /* Reset Error flag */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, &chan->control); + /* Binary encoding; Normal count; non-quadrature mode */ + iowrite8(QUAD8_CTR_CMR, &chan->control); + /* Disable A and B inputs; preset on index; FLG1 as Carry */ + iowrite8(QUAD8_CTR_IOR, &chan->control); + /* Disable index function; negative index polarity */ + iowrite8(QUAD8_CTR_IDR, &chan->control); +} + static int quad8_probe(struct device *dev, unsigned int id) { - struct iio_dev *indio_dev; - struct quad8_iio *quad8iio; - int i, j; - unsigned int base_offset; + struct counter_device *counter; + struct quad8 *priv; + unsigned long i; int err; if (!devm_request_region(dev, base[id], QUAD8_EXTENT, dev_name(dev))) { @@ -1282,62 +1241,48 @@ static int quad8_probe(struct device *dev, unsigned int id) return -EBUSY; } - /* Allocate IIO device; this also allocates driver data structure */ - indio_dev = devm_iio_device_alloc(dev, sizeof(*quad8iio)); - if (!indio_dev) + counter = devm_counter_alloc(dev, sizeof(*priv)); + if (!counter) return -ENOMEM; + priv = counter_priv(counter); - /* Initialize IIO device */ - indio_dev->info = &quad8_info; - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->num_channels = ARRAY_SIZE(quad8_channels); - indio_dev->channels = quad8_channels; - indio_dev->name = dev_name(dev); - indio_dev->dev.parent = dev; + priv->reg = devm_ioport_map(dev, base[id], QUAD8_EXTENT); + if (!priv->reg) + return -ENOMEM; /* Initialize Counter device and driver data */ - quad8iio = iio_priv(indio_dev); - quad8iio->counter.name = dev_name(dev); - quad8iio->counter.parent = dev; - quad8iio->counter.ops = &quad8_ops; - quad8iio->counter.counts = quad8_counts; - quad8iio->counter.num_counts = ARRAY_SIZE(quad8_counts); - quad8iio->counter.signals = quad8_signals; - quad8iio->counter.num_signals = ARRAY_SIZE(quad8_signals); - quad8iio->counter.priv = quad8iio; - quad8iio->base = base[id]; - + counter->name = dev_name(dev); + counter->parent = dev; + counter->ops = &quad8_ops; + counter->counts = quad8_counts; + counter->num_counts = ARRAY_SIZE(quad8_counts); + counter->signals = quad8_signals; + counter->num_signals = ARRAY_SIZE(quad8_signals); + + spin_lock_init(&priv->lock); + + /* Reset Index/Interrupt Register */ + iowrite8(0x00, &priv->reg->index_interrupt); /* Reset all counters and disable interrupt function */ - outb(QUAD8_CHAN_OP_RESET_COUNTERS, base[id] + QUAD8_REG_CHAN_OP); + iowrite8(QUAD8_CHAN_OP_RESET_COUNTERS, &priv->reg->channel_oper); /* Set initial configuration for all counters */ - for (i = 0; i < QUAD8_NUM_COUNTERS; i++) { - base_offset = base[id] + 2 * i; - /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); - /* Reset Preset Register */ - for (j = 0; j < 3; j++) - outb(0x00, base_offset); - /* Reset Borrow, Carry, Compare, and Sign flags */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1); - /* Reset Error flag */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1); - /* Binary encoding; Normal count; non-quadrature mode */ - outb(QUAD8_CTR_CMR, base_offset + 1); - /* Disable A and B inputs; preset on index; FLG1 as Carry */ - outb(QUAD8_CTR_IOR, base_offset + 1); - /* Disable index function; negative index polarity */ - outb(QUAD8_CTR_IDR, base_offset + 1); - } - /* Enable all counters */ - outb(QUAD8_CHAN_OP_ENABLE_COUNTERS, base[id] + QUAD8_REG_CHAN_OP); - - /* Register IIO device */ - err = devm_iio_device_register(dev, indio_dev); + for (i = 0; i < QUAD8_NUM_COUNTERS; i++) + quad8_init_counter(priv->reg->channel + i); + /* Disable Differential Encoder Cable Status for all channels */ + iowrite8(0xFF, &priv->reg->cable_status); + /* Enable all counters and enable interrupt function */ + iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, &priv->reg->channel_oper); + + err = devm_request_irq(&counter->dev, irq[id], quad8_irq_handler, + IRQF_SHARED, counter->name, counter); if (err) return err; - /* Register Counter device */ - return devm_counter_register(dev, &quad8iio->counter); + err = devm_counter_add(dev, counter); + if (err < 0) + return dev_err_probe(dev, err, "Failed to add counter\n"); + + return 0; } static struct isa_driver quad8_driver = { @@ -1347,8 +1292,9 @@ static struct isa_driver quad8_driver = { } }; -module_isa_driver(quad8_driver, num_quad8); +module_isa_driver_with_irq(quad8_driver, num_quad8, num_irq); MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); -MODULE_DESCRIPTION("ACCES 104-QUAD-8 IIO driver"); +MODULE_DESCRIPTION("ACCES 104-QUAD-8 driver"); MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(COUNTER); diff --git a/drivers/counter/Kconfig b/drivers/counter/Kconfig index c80fa76bb531..d388bf26f4dc 100644 --- a/drivers/counter/Kconfig +++ b/drivers/counter/Kconfig @@ -14,7 +14,7 @@ if COUNTER config 104_QUAD_8 tristate "ACCES 104-QUAD-8 driver" - depends on PC104 && X86 && IIO + depends on (PC104 && X86) || COMPILE_TEST select ISA_BUS_API help Say yes here to build support for the ACCES 104-QUAD-8 quadrature @@ -23,11 +23,21 @@ config 104_QUAD_8 A counter's respective error flag may be cleared by performing a write operation on the respective count value attribute. Although the 104-QUAD-8 counters have a 25-bit range, only the lower 24 bits may be - set, either directly or via the counter's preset attribute. Interrupts - are not supported by this driver. + set, either directly or via the counter's preset attribute. The base port addresses for the devices may be configured via the base - array module parameter. + array module parameter. The interrupt line numbers for the devices may + be configured via the irq array module parameter. + +config INTERRUPT_CNT + tristate "Interrupt counter driver" + depends on GPIOLIB + help + Select this option to enable interrupt counter driver. Any interrupt + source can be used by this driver as the event source. + + To compile this driver as a module, choose M here: the + module will be called interrupt-cnt. config STM32_TIMER_CNT tristate "STM32 Timer encoder counter driver" @@ -41,7 +51,7 @@ config STM32_TIMER_CNT config STM32_LPTIMER_CNT tristate "STM32 LP Timer encoder counter driver" - depends on (MFD_STM32_LPTIMER || COMPILE_TEST) && IIO + depends on MFD_STM32_LPTIMER || COMPILE_TEST help Select this option to enable STM32 Low-Power Timer quadrature encoder and counter driver. @@ -70,4 +80,40 @@ config FTM_QUADDEC To compile this driver as a module, choose M here: the module will be called ftm-quaddec. +config MICROCHIP_TCB_CAPTURE + tristate "Microchip Timer Counter Capture driver" + depends on HAS_IOMEM && OF + select REGMAP_MMIO + help + Select this option to enable the Microchip Timer Counter Block + capture driver. + + To compile this driver as a module, choose M here: the + module will be called microchip-tcb-capture. + +config INTEL_QEP + tristate "Intel Quadrature Encoder Peripheral driver" + depends on PCI + help + Select this option to enable the Intel Quadrature Encoder Peripheral + driver. + + To compile this driver as a module, choose M here: the module + will be called intel-qep. + +config TI_ECAP_CAPTURE + tristate "TI eCAP capture driver" + depends on ARCH_OMAP2PLUS || ARCH_DAVINCI_DA8XX || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST + depends on HAS_IOMEM + select REGMAP_MMIO + help + Select this option to enable the Texas Instruments Enhanced Capture + (eCAP) driver in input mode. + + It can be used to timestamp events (falling/rising edges) detected + on ECAP input signal. + + To compile this driver as a module, choose M here: the module + will be called ti-ecap-capture. + endif # COUNTER diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile index 55142d1f4c43..b9a369e0d4fc 100644 --- a/drivers/counter/Makefile +++ b/drivers/counter/Makefile @@ -4,9 +4,14 @@ # obj-$(CONFIG_COUNTER) += counter.o +counter-y := counter-core.o counter-sysfs.o counter-chrdev.o obj-$(CONFIG_104_QUAD_8) += 104-quad-8.o +obj-$(CONFIG_INTERRUPT_CNT) += interrupt-cnt.o obj-$(CONFIG_STM32_TIMER_CNT) += stm32-timer-cnt.o obj-$(CONFIG_STM32_LPTIMER_CNT) += stm32-lptimer-cnt.o obj-$(CONFIG_TI_EQEP) += ti-eqep.o obj-$(CONFIG_FTM_QUADDEC) += ftm-quaddec.o +obj-$(CONFIG_MICROCHIP_TCB_CAPTURE) += microchip-tcb-capture.o +obj-$(CONFIG_INTEL_QEP) += intel-qep.o +obj-$(CONFIG_TI_ECAP_CAPTURE) += ti-ecap-capture.o diff --git a/drivers/counter/counter-chrdev.c b/drivers/counter/counter-chrdev.c new file mode 100644 index 000000000000..80acdf62794a --- /dev/null +++ b/drivers/counter/counter-chrdev.c @@ -0,0 +1,676 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Generic Counter character device interface + * Copyright (C) 2020 William Breathitt Gray + */ +#include <linux/cdev.h> +#include <linux/counter.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/export.h> +#include <linux/fs.h> +#include <linux/kfifo.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/nospec.h> +#include <linux/poll.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/timekeeping.h> +#include <linux/types.h> +#include <linux/uaccess.h> +#include <linux/wait.h> + +#include "counter-chrdev.h" + +struct counter_comp_node { + struct list_head l; + struct counter_component component; + struct counter_comp comp; + void *parent; +}; + +#define counter_comp_read_is_equal(a, b) \ + (a.action_read == b.action_read || \ + a.device_u8_read == b.device_u8_read || \ + a.count_u8_read == b.count_u8_read || \ + a.signal_u8_read == b.signal_u8_read || \ + a.device_u32_read == b.device_u32_read || \ + a.count_u32_read == b.count_u32_read || \ + a.signal_u32_read == b.signal_u32_read || \ + a.device_u64_read == b.device_u64_read || \ + a.count_u64_read == b.count_u64_read || \ + a.signal_u64_read == b.signal_u64_read || \ + a.signal_array_u32_read == b.signal_array_u32_read || \ + a.device_array_u64_read == b.device_array_u64_read || \ + a.count_array_u64_read == b.count_array_u64_read || \ + a.signal_array_u64_read == b.signal_array_u64_read) + +#define counter_comp_read_is_set(comp) \ + (comp.action_read || \ + comp.device_u8_read || \ + comp.count_u8_read || \ + comp.signal_u8_read || \ + comp.device_u32_read || \ + comp.count_u32_read || \ + comp.signal_u32_read || \ + comp.device_u64_read || \ + comp.count_u64_read || \ + comp.signal_u64_read || \ + comp.signal_array_u32_read || \ + comp.device_array_u64_read || \ + comp.count_array_u64_read || \ + comp.signal_array_u64_read) + +static ssize_t counter_chrdev_read(struct file *filp, char __user *buf, + size_t len, loff_t *f_ps) +{ + struct counter_device *const counter = filp->private_data; + int err; + unsigned int copied; + + if (!counter->ops) + return -ENODEV; + + if (len < sizeof(struct counter_event)) + return -EINVAL; + + do { + if (kfifo_is_empty(&counter->events)) { + if (filp->f_flags & O_NONBLOCK) + return -EAGAIN; + + err = wait_event_interruptible(counter->events_wait, + !kfifo_is_empty(&counter->events) || + !counter->ops); + if (err < 0) + return err; + if (!counter->ops) + return -ENODEV; + } + + if (mutex_lock_interruptible(&counter->events_out_lock)) + return -ERESTARTSYS; + err = kfifo_to_user(&counter->events, buf, len, &copied); + mutex_unlock(&counter->events_out_lock); + if (err < 0) + return err; + } while (!copied); + + return copied; +} + +static __poll_t counter_chrdev_poll(struct file *filp, + struct poll_table_struct *pollt) +{ + struct counter_device *const counter = filp->private_data; + __poll_t events = 0; + + if (!counter->ops) + return events; + + poll_wait(filp, &counter->events_wait, pollt); + + if (!kfifo_is_empty(&counter->events)) + events = EPOLLIN | EPOLLRDNORM; + + return events; +} + +static void counter_events_list_free(struct list_head *const events_list) +{ + struct counter_event_node *p, *n; + struct counter_comp_node *q, *o; + + list_for_each_entry_safe(p, n, events_list, l) { + /* Free associated component nodes */ + list_for_each_entry_safe(q, o, &p->comp_list, l) { + list_del(&q->l); + kfree(q); + } + + /* Free event node */ + list_del(&p->l); + kfree(p); + } +} + +static int counter_set_event_node(struct counter_device *const counter, + struct counter_watch *const watch, + const struct counter_comp_node *const cfg) +{ + struct counter_event_node *event_node; + int err = 0; + struct counter_comp_node *comp_node; + + /* Search for event in the list */ + list_for_each_entry(event_node, &counter->next_events_list, l) + if (event_node->event == watch->event && + event_node->channel == watch->channel) + break; + + /* If event is not already in the list */ + if (&event_node->l == &counter->next_events_list) { + /* Allocate new event node */ + event_node = kmalloc(sizeof(*event_node), GFP_KERNEL); + if (!event_node) + return -ENOMEM; + + /* Configure event node and add to the list */ + event_node->event = watch->event; + event_node->channel = watch->channel; + INIT_LIST_HEAD(&event_node->comp_list); + list_add(&event_node->l, &counter->next_events_list); + } + + /* Check if component watch has already been set before */ + list_for_each_entry(comp_node, &event_node->comp_list, l) + if (comp_node->parent == cfg->parent && + counter_comp_read_is_equal(comp_node->comp, cfg->comp)) { + err = -EINVAL; + goto exit_free_event_node; + } + + /* Allocate component node */ + comp_node = kmalloc(sizeof(*comp_node), GFP_KERNEL); + if (!comp_node) { + err = -ENOMEM; + goto exit_free_event_node; + } + *comp_node = *cfg; + + /* Add component node to event node */ + list_add_tail(&comp_node->l, &event_node->comp_list); + +exit_free_event_node: + /* Free event node if no one else is watching */ + if (list_empty(&event_node->comp_list)) { + list_del(&event_node->l); + kfree(event_node); + } + + return err; +} + +static int counter_enable_events(struct counter_device *const counter) +{ + unsigned long flags; + int err = 0; + + mutex_lock(&counter->n_events_list_lock); + spin_lock_irqsave(&counter->events_list_lock, flags); + + counter_events_list_free(&counter->events_list); + list_replace_init(&counter->next_events_list, + &counter->events_list); + + if (counter->ops->events_configure) + err = counter->ops->events_configure(counter); + + spin_unlock_irqrestore(&counter->events_list_lock, flags); + mutex_unlock(&counter->n_events_list_lock); + + return err; +} + +static int counter_disable_events(struct counter_device *const counter) +{ + unsigned long flags; + int err = 0; + + spin_lock_irqsave(&counter->events_list_lock, flags); + + counter_events_list_free(&counter->events_list); + + if (counter->ops->events_configure) + err = counter->ops->events_configure(counter); + + spin_unlock_irqrestore(&counter->events_list_lock, flags); + + mutex_lock(&counter->n_events_list_lock); + + counter_events_list_free(&counter->next_events_list); + + mutex_unlock(&counter->n_events_list_lock); + + return err; +} + +static int counter_get_ext(const struct counter_comp *const ext, + const size_t num_ext, const size_t component_id, + size_t *const ext_idx, size_t *const id) +{ + struct counter_array *element; + + *id = 0; + for (*ext_idx = 0; *ext_idx < num_ext; (*ext_idx)++) { + if (*id == component_id) + return 0; + + if (ext->type == COUNTER_COMP_ARRAY) { + element = ext->priv; + + if (component_id - *id < element->length) + return 0; + + *id += element->length; + } else + (*id)++; + } + + return -EINVAL; +} + +static int counter_add_watch(struct counter_device *const counter, + const unsigned long arg) +{ + void __user *const uwatch = (void __user *)arg; + struct counter_watch watch; + struct counter_comp_node comp_node = {}; + size_t parent, id; + struct counter_comp *ext; + size_t num_ext; + size_t ext_idx, ext_id; + int err = 0; + + if (copy_from_user(&watch, uwatch, sizeof(watch))) + return -EFAULT; + + if (watch.component.type == COUNTER_COMPONENT_NONE) + goto no_component; + + parent = watch.component.parent; + + /* Configure parent component info for comp node */ + switch (watch.component.scope) { + case COUNTER_SCOPE_DEVICE: + ext = counter->ext; + num_ext = counter->num_ext; + break; + case COUNTER_SCOPE_SIGNAL: + if (parent >= counter->num_signals) + return -EINVAL; + parent = array_index_nospec(parent, counter->num_signals); + + comp_node.parent = counter->signals + parent; + + ext = counter->signals[parent].ext; + num_ext = counter->signals[parent].num_ext; + break; + case COUNTER_SCOPE_COUNT: + if (parent >= counter->num_counts) + return -EINVAL; + parent = array_index_nospec(parent, counter->num_counts); + + comp_node.parent = counter->counts + parent; + + ext = counter->counts[parent].ext; + num_ext = counter->counts[parent].num_ext; + break; + default: + return -EINVAL; + } + + id = watch.component.id; + + /* Configure component info for comp node */ + switch (watch.component.type) { + case COUNTER_COMPONENT_SIGNAL: + if (watch.component.scope != COUNTER_SCOPE_SIGNAL) + return -EINVAL; + + comp_node.comp.type = COUNTER_COMP_SIGNAL_LEVEL; + comp_node.comp.signal_u32_read = counter->ops->signal_read; + break; + case COUNTER_COMPONENT_COUNT: + if (watch.component.scope != COUNTER_SCOPE_COUNT) + return -EINVAL; + + comp_node.comp.type = COUNTER_COMP_U64; + comp_node.comp.count_u64_read = counter->ops->count_read; + break; + case COUNTER_COMPONENT_FUNCTION: + if (watch.component.scope != COUNTER_SCOPE_COUNT) + return -EINVAL; + + comp_node.comp.type = COUNTER_COMP_FUNCTION; + comp_node.comp.count_u32_read = counter->ops->function_read; + break; + case COUNTER_COMPONENT_SYNAPSE_ACTION: + if (watch.component.scope != COUNTER_SCOPE_COUNT) + return -EINVAL; + if (id >= counter->counts[parent].num_synapses) + return -EINVAL; + id = array_index_nospec(id, counter->counts[parent].num_synapses); + + comp_node.comp.type = COUNTER_COMP_SYNAPSE_ACTION; + comp_node.comp.action_read = counter->ops->action_read; + comp_node.comp.priv = counter->counts[parent].synapses + id; + break; + case COUNTER_COMPONENT_EXTENSION: + err = counter_get_ext(ext, num_ext, id, &ext_idx, &ext_id); + if (err < 0) + return err; + + comp_node.comp = ext[ext_idx]; + break; + default: + return -EINVAL; + } + if (!counter_comp_read_is_set(comp_node.comp)) + return -EOPNOTSUPP; + +no_component: + mutex_lock(&counter->n_events_list_lock); + + if (counter->ops->watch_validate) { + err = counter->ops->watch_validate(counter, &watch); + if (err < 0) + goto err_exit; + } + + comp_node.component = watch.component; + + err = counter_set_event_node(counter, &watch, &comp_node); + +err_exit: + mutex_unlock(&counter->n_events_list_lock); + + return err; +} + +static long counter_chrdev_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct counter_device *const counter = filp->private_data; + int ret = -ENODEV; + + mutex_lock(&counter->ops_exist_lock); + + if (!counter->ops) + goto out_unlock; + + switch (cmd) { + case COUNTER_ADD_WATCH_IOCTL: + ret = counter_add_watch(counter, arg); + break; + case COUNTER_ENABLE_EVENTS_IOCTL: + ret = counter_enable_events(counter); + break; + case COUNTER_DISABLE_EVENTS_IOCTL: + ret = counter_disable_events(counter); + break; + default: + ret = -ENOIOCTLCMD; + break; + } + +out_unlock: + mutex_unlock(&counter->ops_exist_lock); + + return ret; +} + +static int counter_chrdev_open(struct inode *inode, struct file *filp) +{ + struct counter_device *const counter = container_of(inode->i_cdev, + typeof(*counter), + chrdev); + + get_device(&counter->dev); + filp->private_data = counter; + + return nonseekable_open(inode, filp); +} + +static int counter_chrdev_release(struct inode *inode, struct file *filp) +{ + struct counter_device *const counter = filp->private_data; + int ret = 0; + + mutex_lock(&counter->ops_exist_lock); + + if (!counter->ops) { + /* Free any lingering held memory */ + counter_events_list_free(&counter->events_list); + counter_events_list_free(&counter->next_events_list); + ret = -ENODEV; + goto out_unlock; + } + + ret = counter_disable_events(counter); + if (ret < 0) { + mutex_unlock(&counter->ops_exist_lock); + return ret; + } + +out_unlock: + mutex_unlock(&counter->ops_exist_lock); + + put_device(&counter->dev); + + return ret; +} + +static const struct file_operations counter_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = counter_chrdev_read, + .poll = counter_chrdev_poll, + .unlocked_ioctl = counter_chrdev_ioctl, + .open = counter_chrdev_open, + .release = counter_chrdev_release, +}; + +int counter_chrdev_add(struct counter_device *const counter) +{ + /* Initialize Counter events lists */ + INIT_LIST_HEAD(&counter->events_list); + INIT_LIST_HEAD(&counter->next_events_list); + spin_lock_init(&counter->events_list_lock); + mutex_init(&counter->n_events_list_lock); + init_waitqueue_head(&counter->events_wait); + spin_lock_init(&counter->events_in_lock); + mutex_init(&counter->events_out_lock); + + /* Initialize character device */ + cdev_init(&counter->chrdev, &counter_fops); + + /* Allocate Counter events queue */ + return kfifo_alloc(&counter->events, 64, GFP_KERNEL); +} + +void counter_chrdev_remove(struct counter_device *const counter) +{ + kfifo_free(&counter->events); +} + +static int counter_get_array_data(struct counter_device *const counter, + const enum counter_scope scope, + void *const parent, + const struct counter_comp *const comp, + const size_t idx, u64 *const value) +{ + const struct counter_array *const element = comp->priv; + u32 value_u32 = 0; + int ret; + + switch (element->type) { + case COUNTER_COMP_SIGNAL_POLARITY: + if (scope != COUNTER_SCOPE_SIGNAL) + return -EINVAL; + ret = comp->signal_array_u32_read(counter, parent, idx, + &value_u32); + *value = value_u32; + return ret; + case COUNTER_COMP_U64: + switch (scope) { + case COUNTER_SCOPE_DEVICE: + return comp->device_array_u64_read(counter, idx, value); + case COUNTER_SCOPE_SIGNAL: + return comp->signal_array_u64_read(counter, parent, idx, + value); + case COUNTER_SCOPE_COUNT: + return comp->count_array_u64_read(counter, parent, idx, + value); + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +static int counter_get_data(struct counter_device *const counter, + const struct counter_comp_node *const comp_node, + u64 *const value) +{ + const struct counter_comp *const comp = &comp_node->comp; + const enum counter_scope scope = comp_node->component.scope; + const size_t id = comp_node->component.id; + struct counter_signal *const signal = comp_node->parent; + struct counter_count *const count = comp_node->parent; + u8 value_u8 = 0; + u32 value_u32 = 0; + const struct counter_comp *ext; + size_t num_ext; + size_t ext_idx, ext_id; + int ret; + + if (comp_node->component.type == COUNTER_COMPONENT_NONE) + return 0; + + switch (comp->type) { + case COUNTER_COMP_U8: + case COUNTER_COMP_BOOL: + switch (scope) { + case COUNTER_SCOPE_DEVICE: + ret = comp->device_u8_read(counter, &value_u8); + break; + case COUNTER_SCOPE_SIGNAL: + ret = comp->signal_u8_read(counter, signal, &value_u8); + break; + case COUNTER_SCOPE_COUNT: + ret = comp->count_u8_read(counter, count, &value_u8); + break; + default: + return -EINVAL; + } + *value = value_u8; + return ret; + case COUNTER_COMP_SIGNAL_LEVEL: + case COUNTER_COMP_FUNCTION: + case COUNTER_COMP_ENUM: + case COUNTER_COMP_COUNT_DIRECTION: + case COUNTER_COMP_COUNT_MODE: + case COUNTER_COMP_SIGNAL_POLARITY: + switch (scope) { + case COUNTER_SCOPE_DEVICE: + ret = comp->device_u32_read(counter, &value_u32); + break; + case COUNTER_SCOPE_SIGNAL: + ret = comp->signal_u32_read(counter, signal, + &value_u32); + break; + case COUNTER_SCOPE_COUNT: + ret = comp->count_u32_read(counter, count, &value_u32); + break; + default: + return -EINVAL; + } + *value = value_u32; + return ret; + case COUNTER_COMP_U64: + switch (scope) { + case COUNTER_SCOPE_DEVICE: + return comp->device_u64_read(counter, value); + case COUNTER_SCOPE_SIGNAL: + return comp->signal_u64_read(counter, signal, value); + case COUNTER_SCOPE_COUNT: + return comp->count_u64_read(counter, count, value); + default: + return -EINVAL; + } + case COUNTER_COMP_SYNAPSE_ACTION: + ret = comp->action_read(counter, count, comp->priv, &value_u32); + *value = value_u32; + return ret; + case COUNTER_COMP_ARRAY: + switch (scope) { + case COUNTER_SCOPE_DEVICE: + ext = counter->ext; + num_ext = counter->num_ext; + break; + case COUNTER_SCOPE_SIGNAL: + ext = signal->ext; + num_ext = signal->num_ext; + break; + case COUNTER_SCOPE_COUNT: + ext = count->ext; + num_ext = count->num_ext; + break; + default: + return -EINVAL; + } + ret = counter_get_ext(ext, num_ext, id, &ext_idx, &ext_id); + if (ret < 0) + return ret; + + return counter_get_array_data(counter, scope, comp_node->parent, + comp, id - ext_id, value); + default: + return -EINVAL; + } +} + +/** + * counter_push_event - queue event for userspace reading + * @counter: pointer to Counter structure + * @event: triggered event + * @channel: event channel + * + * Note: If no one is watching for the respective event, it is silently + * discarded. + */ +void counter_push_event(struct counter_device *const counter, const u8 event, + const u8 channel) +{ + struct counter_event ev; + unsigned int copied = 0; + unsigned long flags; + struct counter_event_node *event_node; + struct counter_comp_node *comp_node; + + ev.timestamp = ktime_get_ns(); + ev.watch.event = event; + ev.watch.channel = channel; + + /* Could be in an interrupt context, so use a spin lock */ + spin_lock_irqsave(&counter->events_list_lock, flags); + + /* Search for event in the list */ + list_for_each_entry(event_node, &counter->events_list, l) + if (event_node->event == event && + event_node->channel == channel) + break; + + /* If event is not in the list */ + if (&event_node->l == &counter->events_list) + goto exit_early; + + /* Read and queue relevant comp for userspace */ + list_for_each_entry(comp_node, &event_node->comp_list, l) { + ev.watch.component = comp_node->component; + ev.status = -counter_get_data(counter, comp_node, &ev.value); + + copied += kfifo_in_spinlocked_noirqsave(&counter->events, &ev, + 1, &counter->events_in_lock); + } + +exit_early: + spin_unlock_irqrestore(&counter->events_list_lock, flags); + + if (copied) + wake_up_poll(&counter->events_wait, EPOLLIN); +} +EXPORT_SYMBOL_NS_GPL(counter_push_event, COUNTER); diff --git a/drivers/counter/counter-chrdev.h b/drivers/counter/counter-chrdev.h new file mode 100644 index 000000000000..5529d16703c4 --- /dev/null +++ b/drivers/counter/counter-chrdev.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Counter character device interface + * Copyright (C) 2020 William Breathitt Gray + */ +#ifndef _COUNTER_CHRDEV_H_ +#define _COUNTER_CHRDEV_H_ + +#include <linux/counter.h> + +int counter_chrdev_add(struct counter_device *const counter); +void counter_chrdev_remove(struct counter_device *const counter); + +#endif /* _COUNTER_CHRDEV_H_ */ diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c new file mode 100644 index 000000000000..09c77afb33ca --- /dev/null +++ b/drivers/counter/counter-core.c @@ -0,0 +1,282 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Generic Counter interface + * Copyright (C) 2020 William Breathitt Gray + */ +#include <linux/cdev.h> +#include <linux/counter.h> +#include <linux/device.h> +#include <linux/device/bus.h> +#include <linux/export.h> +#include <linux/fs.h> +#include <linux/gfp.h> +#include <linux/idr.h> +#include <linux/init.h> +#include <linux/kdev_t.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/wait.h> + +#include "counter-chrdev.h" +#include "counter-sysfs.h" + +#define COUNTER_NAME "counter" + +/* Provides a unique ID for each counter device */ +static DEFINE_IDA(counter_ida); + +struct counter_device_allochelper { + struct counter_device counter; + + /* + * This is cache line aligned to ensure private data behaves like if it + * were kmalloced separately. + */ + unsigned long privdata[] ____cacheline_aligned; +}; + +static void counter_device_release(struct device *dev) +{ + struct counter_device *const counter = + container_of(dev, struct counter_device, dev); + + counter_chrdev_remove(counter); + ida_free(&counter_ida, dev->id); + + kfree(container_of(counter, struct counter_device_allochelper, counter)); +} + +static struct device_type counter_device_type = { + .name = "counter_device", + .release = counter_device_release, +}; + +static struct bus_type counter_bus_type = { + .name = "counter", + .dev_name = "counter", +}; + +static dev_t counter_devt; + +/** + * counter_priv - access counter device private data + * @counter: counter device + * + * Get the counter device private data + */ +void *counter_priv(const struct counter_device *const counter) +{ + struct counter_device_allochelper *ch = + container_of(counter, struct counter_device_allochelper, counter); + + return &ch->privdata; +} +EXPORT_SYMBOL_NS_GPL(counter_priv, COUNTER); + +/** + * counter_alloc - allocate a counter_device + * @sizeof_priv: size of the driver private data + * + * This is part one of counter registration. The structure is allocated + * dynamically to ensure the right lifetime for the embedded struct device. + * + * If this succeeds, call counter_put() to get rid of the counter_device again. + */ +struct counter_device *counter_alloc(size_t sizeof_priv) +{ + struct counter_device_allochelper *ch; + struct counter_device *counter; + struct device *dev; + int err; + + ch = kzalloc(sizeof(*ch) + sizeof_priv, GFP_KERNEL); + if (!ch) + return NULL; + + counter = &ch->counter; + dev = &counter->dev; + + /* Acquire unique ID */ + err = ida_alloc(&counter_ida, GFP_KERNEL); + if (err < 0) + goto err_ida_alloc; + dev->id = err; + + mutex_init(&counter->ops_exist_lock); + dev->type = &counter_device_type; + dev->bus = &counter_bus_type; + dev->devt = MKDEV(MAJOR(counter_devt), dev->id); + + err = counter_chrdev_add(counter); + if (err < 0) + goto err_chrdev_add; + + device_initialize(dev); + + err = dev_set_name(dev, COUNTER_NAME "%d", dev->id); + if (err) + goto err_dev_set_name; + + return counter; + +err_dev_set_name: + + counter_chrdev_remove(counter); +err_chrdev_add: + + ida_free(&counter_ida, dev->id); +err_ida_alloc: + + kfree(ch); + + return NULL; +} +EXPORT_SYMBOL_NS_GPL(counter_alloc, COUNTER); + +void counter_put(struct counter_device *counter) +{ + put_device(&counter->dev); +} +EXPORT_SYMBOL_NS_GPL(counter_put, COUNTER); + +/** + * counter_add - complete registration of a counter + * @counter: the counter to add + * + * This is part two of counter registration. + * + * If this succeeds, call counter_unregister() to get rid of the counter_device again. + */ +int counter_add(struct counter_device *counter) +{ + int err; + struct device *dev = &counter->dev; + + if (counter->parent) { + dev->parent = counter->parent; + dev->of_node = counter->parent->of_node; + } + + err = counter_sysfs_add(counter); + if (err < 0) + return err; + + /* implies device_add(dev) */ + return cdev_device_add(&counter->chrdev, dev); +} +EXPORT_SYMBOL_NS_GPL(counter_add, COUNTER); + +/** + * counter_unregister - unregister Counter from the system + * @counter: pointer to Counter to unregister + * + * The Counter is unregistered from the system. + */ +void counter_unregister(struct counter_device *const counter) +{ + if (!counter) + return; + + cdev_device_del(&counter->chrdev, &counter->dev); + + mutex_lock(&counter->ops_exist_lock); + + counter->ops = NULL; + wake_up(&counter->events_wait); + + mutex_unlock(&counter->ops_exist_lock); +} +EXPORT_SYMBOL_NS_GPL(counter_unregister, COUNTER); + +static void devm_counter_release(void *counter) +{ + counter_unregister(counter); +} + +static void devm_counter_put(void *counter) +{ + counter_put(counter); +} + +/** + * devm_counter_alloc - allocate a counter_device + * @dev: the device to register the release callback for + * @sizeof_priv: size of the driver private data + * + * This is the device managed version of counter_add(). It registers a cleanup + * callback to care for calling counter_put(). + */ +struct counter_device *devm_counter_alloc(struct device *dev, size_t sizeof_priv) +{ + struct counter_device *counter; + int err; + + counter = counter_alloc(sizeof_priv); + if (!counter) + return NULL; + + err = devm_add_action_or_reset(dev, devm_counter_put, counter); + if (err < 0) + return NULL; + + return counter; +} +EXPORT_SYMBOL_NS_GPL(devm_counter_alloc, COUNTER); + +/** + * devm_counter_add - complete registration of a counter + * @dev: the device to register the release callback for + * @counter: the counter to add + * + * This is the device managed version of counter_add(). It registers a cleanup + * callback to care for calling counter_unregister(). + */ +int devm_counter_add(struct device *dev, + struct counter_device *const counter) +{ + int err; + + err = counter_add(counter); + if (err < 0) + return err; + + return devm_add_action_or_reset(dev, devm_counter_release, counter); +} +EXPORT_SYMBOL_NS_GPL(devm_counter_add, COUNTER); + +#define COUNTER_DEV_MAX 256 + +static int __init counter_init(void) +{ + int err; + + err = bus_register(&counter_bus_type); + if (err < 0) + return err; + + err = alloc_chrdev_region(&counter_devt, 0, COUNTER_DEV_MAX, + COUNTER_NAME); + if (err < 0) + goto err_unregister_bus; + + return 0; + +err_unregister_bus: + bus_unregister(&counter_bus_type); + return err; +} + +static void __exit counter_exit(void) +{ + unregister_chrdev_region(counter_devt, COUNTER_DEV_MAX); + bus_unregister(&counter_bus_type); +} + +subsys_initcall(counter_init); +module_exit(counter_exit); + +MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); +MODULE_DESCRIPTION("Generic Counter interface"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c new file mode 100644 index 000000000000..b9efe66f9f8d --- /dev/null +++ b/drivers/counter/counter-sysfs.c @@ -0,0 +1,1170 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Generic Counter sysfs interface + * Copyright (C) 2020 William Breathitt Gray + */ +#include <linux/counter.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/gfp.h> +#include <linux/kernel.h> +#include <linux/kfifo.h> +#include <linux/kstrtox.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/spinlock.h> +#include <linux/string.h> +#include <linux/sysfs.h> +#include <linux/types.h> + +#include "counter-sysfs.h" + +static inline struct counter_device *counter_from_dev(struct device *dev) +{ + return container_of(dev, struct counter_device, dev); +} + +/** + * struct counter_attribute - Counter sysfs attribute + * @dev_attr: device attribute for sysfs + * @l: node to add Counter attribute to attribute group list + * @comp: Counter component callbacks and data + * @scope: Counter scope of the attribute + * @parent: pointer to the parent component + */ +struct counter_attribute { + struct device_attribute dev_attr; + struct list_head l; + + struct counter_comp comp; + enum counter_scope scope; + void *parent; +}; + +#define to_counter_attribute(_dev_attr) \ + container_of(_dev_attr, struct counter_attribute, dev_attr) + +/** + * struct counter_attribute_group - container for attribute group + * @name: name of the attribute group + * @attr_list: list to keep track of created attributes + * @num_attr: number of attributes + */ +struct counter_attribute_group { + const char *name; + struct list_head attr_list; + size_t num_attr; +}; + +static const char *const counter_function_str[] = { + [COUNTER_FUNCTION_INCREASE] = "increase", + [COUNTER_FUNCTION_DECREASE] = "decrease", + [COUNTER_FUNCTION_PULSE_DIRECTION] = "pulse-direction", + [COUNTER_FUNCTION_QUADRATURE_X1_A] = "quadrature x1 a", + [COUNTER_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b", + [COUNTER_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a", + [COUNTER_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b", + [COUNTER_FUNCTION_QUADRATURE_X4] = "quadrature x4" +}; + +static const char *const counter_signal_value_str[] = { + [COUNTER_SIGNAL_LEVEL_LOW] = "low", + [COUNTER_SIGNAL_LEVEL_HIGH] = "high" +}; + +static const char *const counter_synapse_action_str[] = { + [COUNTER_SYNAPSE_ACTION_NONE] = "none", + [COUNTER_SYNAPSE_ACTION_RISING_EDGE] = "rising edge", + [COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = "falling edge", + [COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = "both edges" +}; + +static const char *const counter_count_direction_str[] = { + [COUNTER_COUNT_DIRECTION_FORWARD] = "forward", + [COUNTER_COUNT_DIRECTION_BACKWARD] = "backward" +}; + +static const char *const counter_count_mode_str[] = { + [COUNTER_COUNT_MODE_NORMAL] = "normal", + [COUNTER_COUNT_MODE_RANGE_LIMIT] = "range limit", + [COUNTER_COUNT_MODE_NON_RECYCLE] = "non-recycle", + [COUNTER_COUNT_MODE_MODULO_N] = "modulo-n" +}; + +static const char *const counter_signal_polarity_str[] = { + [COUNTER_SIGNAL_POLARITY_POSITIVE] = "positive", + [COUNTER_SIGNAL_POLARITY_NEGATIVE] = "negative" +}; + +static ssize_t counter_comp_u8_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + int err; + u8 data = 0; + + switch (a->scope) { + case COUNTER_SCOPE_DEVICE: + err = a->comp.device_u8_read(counter, &data); + break; + case COUNTER_SCOPE_SIGNAL: + err = a->comp.signal_u8_read(counter, a->parent, &data); + break; + case COUNTER_SCOPE_COUNT: + err = a->comp.count_u8_read(counter, a->parent, &data); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + if (a->comp.type == COUNTER_COMP_BOOL) + /* data should already be boolean but ensure just to be safe */ + data = !!data; + + return sysfs_emit(buf, "%u\n", (unsigned int)data); +} + +static ssize_t counter_comp_u8_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + int err; + bool bool_data = 0; + u8 data = 0; + + if (a->comp.type == COUNTER_COMP_BOOL) { + err = kstrtobool(buf, &bool_data); + data = bool_data; + } else + err = kstrtou8(buf, 0, &data); + if (err < 0) + return err; + + switch (a->scope) { + case COUNTER_SCOPE_DEVICE: + err = a->comp.device_u8_write(counter, data); + break; + case COUNTER_SCOPE_SIGNAL: + err = a->comp.signal_u8_write(counter, a->parent, data); + break; + case COUNTER_SCOPE_COUNT: + err = a->comp.count_u8_write(counter, a->parent, data); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + return len; +} + +static ssize_t counter_comp_u32_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + const struct counter_available *const avail = a->comp.priv; + int err; + u32 data = 0; + + switch (a->scope) { + case COUNTER_SCOPE_DEVICE: + err = a->comp.device_u32_read(counter, &data); + break; + case COUNTER_SCOPE_SIGNAL: + err = a->comp.signal_u32_read(counter, a->parent, &data); + break; + case COUNTER_SCOPE_COUNT: + if (a->comp.type == COUNTER_COMP_SYNAPSE_ACTION) + err = a->comp.action_read(counter, a->parent, + a->comp.priv, &data); + else + err = a->comp.count_u32_read(counter, a->parent, &data); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + switch (a->comp.type) { + case COUNTER_COMP_FUNCTION: + return sysfs_emit(buf, "%s\n", counter_function_str[data]); + case COUNTER_COMP_SIGNAL_LEVEL: + return sysfs_emit(buf, "%s\n", counter_signal_value_str[data]); + case COUNTER_COMP_SYNAPSE_ACTION: + return sysfs_emit(buf, "%s\n", counter_synapse_action_str[data]); + case COUNTER_COMP_ENUM: + return sysfs_emit(buf, "%s\n", avail->strs[data]); + case COUNTER_COMP_COUNT_DIRECTION: + return sysfs_emit(buf, "%s\n", counter_count_direction_str[data]); + case COUNTER_COMP_COUNT_MODE: + return sysfs_emit(buf, "%s\n", counter_count_mode_str[data]); + case COUNTER_COMP_SIGNAL_POLARITY: + return sysfs_emit(buf, "%s\n", counter_signal_polarity_str[data]); + default: + return sysfs_emit(buf, "%u\n", (unsigned int)data); + } +} + +static int counter_find_enum(u32 *const enum_item, const u32 *const enums, + const size_t num_enums, const char *const buf, + const char *const string_array[]) +{ + size_t index; + + for (index = 0; index < num_enums; index++) { + *enum_item = enums[index]; + if (sysfs_streq(buf, string_array[*enum_item])) + return 0; + } + + return -EINVAL; +} + +static ssize_t counter_comp_u32_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + struct counter_count *const count = a->parent; + struct counter_synapse *const synapse = a->comp.priv; + const struct counter_available *const avail = a->comp.priv; + int err; + u32 data = 0; + + switch (a->comp.type) { + case COUNTER_COMP_FUNCTION: + err = counter_find_enum(&data, count->functions_list, + count->num_functions, buf, + counter_function_str); + break; + case COUNTER_COMP_SYNAPSE_ACTION: + err = counter_find_enum(&data, synapse->actions_list, + synapse->num_actions, buf, + counter_synapse_action_str); + break; + case COUNTER_COMP_ENUM: + err = __sysfs_match_string(avail->strs, avail->num_items, buf); + data = err; + break; + case COUNTER_COMP_COUNT_MODE: + err = counter_find_enum(&data, avail->enums, avail->num_items, + buf, counter_count_mode_str); + break; + case COUNTER_COMP_SIGNAL_POLARITY: + err = counter_find_enum(&data, avail->enums, avail->num_items, + buf, counter_signal_polarity_str); + break; + default: + err = kstrtou32(buf, 0, &data); + break; + } + if (err < 0) + return err; + + switch (a->scope) { + case COUNTER_SCOPE_DEVICE: + err = a->comp.device_u32_write(counter, data); + break; + case COUNTER_SCOPE_SIGNAL: + err = a->comp.signal_u32_write(counter, a->parent, data); + break; + case COUNTER_SCOPE_COUNT: + if (a->comp.type == COUNTER_COMP_SYNAPSE_ACTION) + err = a->comp.action_write(counter, count, synapse, + data); + else + err = a->comp.count_u32_write(counter, count, data); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + return len; +} + +static ssize_t counter_comp_u64_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + int err; + u64 data = 0; + + switch (a->scope) { + case COUNTER_SCOPE_DEVICE: + err = a->comp.device_u64_read(counter, &data); + break; + case COUNTER_SCOPE_SIGNAL: + err = a->comp.signal_u64_read(counter, a->parent, &data); + break; + case COUNTER_SCOPE_COUNT: + err = a->comp.count_u64_read(counter, a->parent, &data); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + return sysfs_emit(buf, "%llu\n", (unsigned long long)data); +} + +static ssize_t counter_comp_u64_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + int err; + u64 data = 0; + + err = kstrtou64(buf, 0, &data); + if (err < 0) + return err; + + switch (a->scope) { + case COUNTER_SCOPE_DEVICE: + err = a->comp.device_u64_write(counter, data); + break; + case COUNTER_SCOPE_SIGNAL: + err = a->comp.signal_u64_write(counter, a->parent, data); + break; + case COUNTER_SCOPE_COUNT: + err = a->comp.count_u64_write(counter, a->parent, data); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + return len; +} + +static ssize_t counter_comp_array_u32_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + const struct counter_array *const element = a->comp.priv; + int err; + u32 data = 0; + + if (a->scope != COUNTER_SCOPE_SIGNAL || + element->type != COUNTER_COMP_SIGNAL_POLARITY) + return -EINVAL; + + err = a->comp.signal_array_u32_read(counter, a->parent, element->idx, + &data); + if (err < 0) + return err; + + return sysfs_emit(buf, "%s\n", counter_signal_polarity_str[data]); +} + +static ssize_t counter_comp_array_u32_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + const struct counter_array *const element = a->comp.priv; + int err; + u32 data = 0; + + if (element->type != COUNTER_COMP_SIGNAL_POLARITY || + a->scope != COUNTER_SCOPE_SIGNAL) + return -EINVAL; + + err = counter_find_enum(&data, element->avail->enums, + element->avail->num_items, buf, + counter_signal_polarity_str); + if (err < 0) + return err; + + err = a->comp.signal_array_u32_write(counter, a->parent, element->idx, + data); + if (err < 0) + return err; + + return len; +} + +static ssize_t counter_comp_array_u64_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + const struct counter_array *const element = a->comp.priv; + int err; + u64 data = 0; + + switch (a->scope) { + case COUNTER_SCOPE_DEVICE: + err = a->comp.device_array_u64_read(counter, element->idx, + &data); + break; + case COUNTER_SCOPE_SIGNAL: + err = a->comp.signal_array_u64_read(counter, a->parent, + element->idx, &data); + break; + case COUNTER_SCOPE_COUNT: + err = a->comp.count_array_u64_read(counter, a->parent, + element->idx, &data); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + return sysfs_emit(buf, "%llu\n", (unsigned long long)data); +} + +static ssize_t counter_comp_array_u64_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + struct counter_device *const counter = counter_from_dev(dev); + const struct counter_array *const element = a->comp.priv; + int err; + u64 data = 0; + + err = kstrtou64(buf, 0, &data); + if (err < 0) + return err; + + switch (a->scope) { + case COUNTER_SCOPE_DEVICE: + err = a->comp.device_array_u64_write(counter, element->idx, + data); + break; + case COUNTER_SCOPE_SIGNAL: + err = a->comp.signal_array_u64_write(counter, a->parent, + element->idx, data); + break; + case COUNTER_SCOPE_COUNT: + err = a->comp.count_array_u64_write(counter, a->parent, + element->idx, data); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + return len; +} + +static ssize_t enums_available_show(const u32 *const enums, + const size_t num_enums, + const char *const strs[], char *buf) +{ + size_t len = 0; + size_t index; + + for (index = 0; index < num_enums; index++) + len += sysfs_emit_at(buf, len, "%s\n", strs[enums[index]]); + + return len; +} + +static ssize_t strs_available_show(const struct counter_available *const avail, + char *buf) +{ + size_t len = 0; + size_t index; + + for (index = 0; index < avail->num_items; index++) + len += sysfs_emit_at(buf, len, "%s\n", avail->strs[index]); + + return len; +} + +static ssize_t counter_comp_available_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + const struct counter_attribute *const a = to_counter_attribute(attr); + const struct counter_count *const count = a->parent; + const struct counter_synapse *const synapse = a->comp.priv; + const struct counter_available *const avail = a->comp.priv; + + switch (a->comp.type) { + case COUNTER_COMP_FUNCTION: + return enums_available_show(count->functions_list, + count->num_functions, + counter_function_str, buf); + case COUNTER_COMP_SYNAPSE_ACTION: + return enums_available_show(synapse->actions_list, + synapse->num_actions, + counter_synapse_action_str, buf); + case COUNTER_COMP_ENUM: + return strs_available_show(avail, buf); + case COUNTER_COMP_COUNT_MODE: + return enums_available_show(avail->enums, avail->num_items, + counter_count_mode_str, buf); + default: + return -EINVAL; + } +} + +static int counter_avail_attr_create(struct device *const dev, + struct counter_attribute_group *const group, + const struct counter_comp *const comp, void *const parent) +{ + struct counter_attribute *counter_attr; + struct device_attribute *dev_attr; + + counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL); + if (!counter_attr) + return -ENOMEM; + + /* Configure Counter attribute */ + counter_attr->comp.type = comp->type; + counter_attr->comp.priv = comp->priv; + counter_attr->parent = parent; + + /* Initialize sysfs attribute */ + dev_attr = &counter_attr->dev_attr; + sysfs_attr_init(&dev_attr->attr); + + /* Configure device attribute */ + dev_attr->attr.name = devm_kasprintf(dev, GFP_KERNEL, "%s_available", + comp->name); + if (!dev_attr->attr.name) + return -ENOMEM; + dev_attr->attr.mode = 0444; + dev_attr->show = counter_comp_available_show; + + /* Store list node */ + list_add(&counter_attr->l, &group->attr_list); + group->num_attr++; + + return 0; +} + +static int counter_attr_create(struct device *const dev, + struct counter_attribute_group *const group, + const struct counter_comp *const comp, + const enum counter_scope scope, + void *const parent) +{ + const struct counter_array *const array = comp->priv; + struct counter_attribute *counter_attr; + struct device_attribute *dev_attr; + + counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL); + if (!counter_attr) + return -ENOMEM; + + /* Configure Counter attribute */ + counter_attr->comp = *comp; + counter_attr->scope = scope; + counter_attr->parent = parent; + + /* Configure device attribute */ + dev_attr = &counter_attr->dev_attr; + sysfs_attr_init(&dev_attr->attr); + dev_attr->attr.name = comp->name; + switch (comp->type) { + case COUNTER_COMP_U8: + case COUNTER_COMP_BOOL: + if (comp->device_u8_read) { + dev_attr->attr.mode |= 0444; + dev_attr->show = counter_comp_u8_show; + } + if (comp->device_u8_write) { + dev_attr->attr.mode |= 0200; + dev_attr->store = counter_comp_u8_store; + } + break; + case COUNTER_COMP_SIGNAL_LEVEL: + case COUNTER_COMP_FUNCTION: + case COUNTER_COMP_SYNAPSE_ACTION: + case COUNTER_COMP_ENUM: + case COUNTER_COMP_COUNT_DIRECTION: + case COUNTER_COMP_COUNT_MODE: + case COUNTER_COMP_SIGNAL_POLARITY: + if (comp->device_u32_read) { + dev_attr->attr.mode |= 0444; + dev_attr->show = counter_comp_u32_show; + } + if (comp->device_u32_write) { + dev_attr->attr.mode |= 0200; + dev_attr->store = counter_comp_u32_store; + } + break; + case COUNTER_COMP_U64: + if (comp->device_u64_read) { + dev_attr->attr.mode |= 0444; + dev_attr->show = counter_comp_u64_show; + } + if (comp->device_u64_write) { + dev_attr->attr.mode |= 0200; + dev_attr->store = counter_comp_u64_store; + } + break; + case COUNTER_COMP_ARRAY: + switch (array->type) { + case COUNTER_COMP_SIGNAL_POLARITY: + if (comp->signal_array_u32_read) { + dev_attr->attr.mode |= 0444; + dev_attr->show = counter_comp_array_u32_show; + } + if (comp->signal_array_u32_write) { + dev_attr->attr.mode |= 0200; + dev_attr->store = counter_comp_array_u32_store; + } + break; + case COUNTER_COMP_U64: + if (comp->device_array_u64_read) { + dev_attr->attr.mode |= 0444; + dev_attr->show = counter_comp_array_u64_show; + } + if (comp->device_array_u64_write) { + dev_attr->attr.mode |= 0200; + dev_attr->store = counter_comp_array_u64_store; + } + break; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } + + /* Store list node */ + list_add(&counter_attr->l, &group->attr_list); + group->num_attr++; + + /* Create "*_available" attribute if needed */ + switch (comp->type) { + case COUNTER_COMP_FUNCTION: + case COUNTER_COMP_SYNAPSE_ACTION: + case COUNTER_COMP_ENUM: + case COUNTER_COMP_COUNT_MODE: + return counter_avail_attr_create(dev, group, comp, parent); + default: + return 0; + } +} + +static ssize_t counter_comp_name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%s\n", to_counter_attribute(attr)->comp.name); +} + +static int counter_name_attr_create(struct device *const dev, + struct counter_attribute_group *const group, + const char *const name) +{ + struct counter_attribute *counter_attr; + + counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL); + if (!counter_attr) + return -ENOMEM; + + /* Configure Counter attribute */ + counter_attr->comp.name = name; + + /* Configure device attribute */ + sysfs_attr_init(&counter_attr->dev_attr.attr); + counter_attr->dev_attr.attr.name = "name"; + counter_attr->dev_attr.attr.mode = 0444; + counter_attr->dev_attr.show = counter_comp_name_show; + + /* Store list node */ + list_add(&counter_attr->l, &group->attr_list); + group->num_attr++; + + return 0; +} + +static ssize_t counter_comp_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const size_t id = (size_t)to_counter_attribute(attr)->comp.priv; + + return sysfs_emit(buf, "%zu\n", id); +} + +static int counter_comp_id_attr_create(struct device *const dev, + struct counter_attribute_group *const group, + const char *name, const size_t id) +{ + struct counter_attribute *counter_attr; + + /* Allocate Counter attribute */ + counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL); + if (!counter_attr) + return -ENOMEM; + + /* Generate component ID name */ + name = devm_kasprintf(dev, GFP_KERNEL, "%s_component_id", name); + if (!name) + return -ENOMEM; + + /* Configure Counter attribute */ + counter_attr->comp.priv = (void *)id; + + /* Configure device attribute */ + sysfs_attr_init(&counter_attr->dev_attr.attr); + counter_attr->dev_attr.attr.name = name; + counter_attr->dev_attr.attr.mode = 0444; + counter_attr->dev_attr.show = counter_comp_id_show; + + /* Store list node */ + list_add(&counter_attr->l, &group->attr_list); + group->num_attr++; + + return 0; +} + +static int counter_ext_attrs_create(struct device *const dev, + struct counter_attribute_group *const group, + const struct counter_comp *const ext, + const enum counter_scope scope, + void *const parent, const size_t id) +{ + int err; + + /* Create main extension attribute */ + err = counter_attr_create(dev, group, ext, scope, parent); + if (err < 0) + return err; + + /* Create extension id attribute */ + return counter_comp_id_attr_create(dev, group, ext->name, id); +} + +static int counter_array_attrs_create(struct device *const dev, + struct counter_attribute_group *const group, + const struct counter_comp *const comp, + const enum counter_scope scope, + void *const parent, const size_t id) +{ + const struct counter_array *const array = comp->priv; + struct counter_comp ext = *comp; + struct counter_array *element; + size_t idx; + int err; + + /* Create an attribute for each array element */ + for (idx = 0; idx < array->length; idx++) { + /* Generate array element attribute name */ + ext.name = devm_kasprintf(dev, GFP_KERNEL, "%s%zu", comp->name, + idx); + if (!ext.name) + return -ENOMEM; + + /* Allocate and configure array element */ + element = devm_kzalloc(dev, sizeof(*element), GFP_KERNEL); + if (!element) + return -ENOMEM; + element->type = array->type; + element->avail = array->avail; + element->idx = idx; + ext.priv = element; + + /* Create all attributes associated with the array element */ + err = counter_ext_attrs_create(dev, group, &ext, scope, parent, + id + idx); + if (err < 0) + return err; + } + + return 0; +} + +static int counter_sysfs_exts_add(struct device *const dev, + struct counter_attribute_group *const group, + const struct counter_comp *const exts, + const size_t num_ext, + const enum counter_scope scope, + void *const parent) +{ + size_t i; + const struct counter_comp *ext; + int err; + size_t id = 0; + const struct counter_array *array; + + /* Create attributes for each extension */ + for (i = 0; i < num_ext; i++) { + ext = &exts[i]; + if (ext->type == COUNTER_COMP_ARRAY) { + err = counter_array_attrs_create(dev, group, ext, scope, + parent, id); + array = ext->priv; + id += array->length; + } else { + err = counter_ext_attrs_create(dev, group, ext, scope, + parent, id); + id++; + } + if (err < 0) + return err; + } + + return 0; +} + +static struct counter_comp counter_signal_comp = { + .type = COUNTER_COMP_SIGNAL_LEVEL, + .name = "signal", +}; + +static int counter_signal_attrs_create(struct counter_device *const counter, + struct counter_attribute_group *const cattr_group, + struct counter_signal *const signal) +{ + const enum counter_scope scope = COUNTER_SCOPE_SIGNAL; + struct device *const dev = &counter->dev; + int err; + struct counter_comp comp; + + /* Create main Signal attribute */ + comp = counter_signal_comp; + comp.signal_u32_read = counter->ops->signal_read; + err = counter_attr_create(dev, cattr_group, &comp, scope, signal); + if (err < 0) + return err; + + /* Create Signal name attribute */ + err = counter_name_attr_create(dev, cattr_group, signal->name); + if (err < 0) + return err; + + /* Add Signal extensions */ + return counter_sysfs_exts_add(dev, cattr_group, signal->ext, + signal->num_ext, scope, signal); +} + +static int counter_sysfs_signals_add(struct counter_device *const counter, + struct counter_attribute_group *const groups) +{ + size_t i; + int err; + + /* Add each Signal */ + for (i = 0; i < counter->num_signals; i++) { + /* Generate Signal attribute directory name */ + groups[i].name = devm_kasprintf(&counter->dev, GFP_KERNEL, + "signal%zu", i); + if (!groups[i].name) + return -ENOMEM; + + /* Create all attributes associated with Signal */ + err = counter_signal_attrs_create(counter, groups + i, + counter->signals + i); + if (err < 0) + return err; + } + + return 0; +} + +static int counter_sysfs_synapses_add(struct counter_device *const counter, + struct counter_attribute_group *const group, + struct counter_count *const count) +{ + size_t i; + + /* Add each Synapse */ + for (i = 0; i < count->num_synapses; i++) { + struct device *const dev = &counter->dev; + struct counter_synapse *synapse; + size_t id; + struct counter_comp comp; + int err; + + synapse = count->synapses + i; + + /* Generate Synapse action name */ + id = synapse->signal - counter->signals; + comp.name = devm_kasprintf(dev, GFP_KERNEL, "signal%zu_action", + id); + if (!comp.name) + return -ENOMEM; + + /* Create action attribute */ + comp.type = COUNTER_COMP_SYNAPSE_ACTION; + comp.action_read = counter->ops->action_read; + comp.action_write = counter->ops->action_write; + comp.priv = synapse; + err = counter_attr_create(dev, group, &comp, + COUNTER_SCOPE_COUNT, count); + if (err < 0) + return err; + + /* Create Synapse component ID attribute */ + err = counter_comp_id_attr_create(dev, group, comp.name, i); + if (err < 0) + return err; + } + + return 0; +} + +static struct counter_comp counter_count_comp = + COUNTER_COMP_COUNT_U64("count", NULL, NULL); + +static struct counter_comp counter_function_comp = { + .type = COUNTER_COMP_FUNCTION, + .name = "function", +}; + +static int counter_count_attrs_create(struct counter_device *const counter, + struct counter_attribute_group *const cattr_group, + struct counter_count *const count) +{ + const enum counter_scope scope = COUNTER_SCOPE_COUNT; + struct device *const dev = &counter->dev; + int err; + struct counter_comp comp; + + /* Create main Count attribute */ + comp = counter_count_comp; + comp.count_u64_read = counter->ops->count_read; + comp.count_u64_write = counter->ops->count_write; + err = counter_attr_create(dev, cattr_group, &comp, scope, count); + if (err < 0) + return err; + + /* Create Count name attribute */ + err = counter_name_attr_create(dev, cattr_group, count->name); + if (err < 0) + return err; + + /* Create Count function attribute */ + comp = counter_function_comp; + comp.count_u32_read = counter->ops->function_read; + comp.count_u32_write = counter->ops->function_write; + err = counter_attr_create(dev, cattr_group, &comp, scope, count); + if (err < 0) + return err; + + /* Add Count extensions */ + return counter_sysfs_exts_add(dev, cattr_group, count->ext, + count->num_ext, scope, count); +} + +static int counter_sysfs_counts_add(struct counter_device *const counter, + struct counter_attribute_group *const groups) +{ + size_t i; + struct counter_count *count; + int err; + + /* Add each Count */ + for (i = 0; i < counter->num_counts; i++) { + count = counter->counts + i; + + /* Generate Count attribute directory name */ + groups[i].name = devm_kasprintf(&counter->dev, GFP_KERNEL, + "count%zu", i); + if (!groups[i].name) + return -ENOMEM; + + /* Add sysfs attributes of the Synapses */ + err = counter_sysfs_synapses_add(counter, groups + i, count); + if (err < 0) + return err; + + /* Create all attributes associated with Count */ + err = counter_count_attrs_create(counter, groups + i, count); + if (err < 0) + return err; + } + + return 0; +} + +static int counter_num_signals_read(struct counter_device *counter, u8 *val) +{ + *val = counter->num_signals; + return 0; +} + +static int counter_num_counts_read(struct counter_device *counter, u8 *val) +{ + *val = counter->num_counts; + return 0; +} + +static int counter_events_queue_size_read(struct counter_device *counter, + u64 *val) +{ + *val = kfifo_size(&counter->events); + return 0; +} + +static int counter_events_queue_size_write(struct counter_device *counter, + u64 val) +{ + DECLARE_KFIFO_PTR(events, struct counter_event); + int err; + unsigned long flags; + + /* Allocate new events queue */ + err = kfifo_alloc(&events, val, GFP_KERNEL); + if (err) + return err; + + /* Swap in new events queue */ + mutex_lock(&counter->events_out_lock); + spin_lock_irqsave(&counter->events_in_lock, flags); + kfifo_free(&counter->events); + counter->events.kfifo = events.kfifo; + spin_unlock_irqrestore(&counter->events_in_lock, flags); + mutex_unlock(&counter->events_out_lock); + + return 0; +} + +static struct counter_comp counter_num_signals_comp = + COUNTER_COMP_DEVICE_U8("num_signals", counter_num_signals_read, NULL); + +static struct counter_comp counter_num_counts_comp = + COUNTER_COMP_DEVICE_U8("num_counts", counter_num_counts_read, NULL); + +static struct counter_comp counter_events_queue_size_comp = + COUNTER_COMP_DEVICE_U64("events_queue_size", + counter_events_queue_size_read, + counter_events_queue_size_write); + +static int counter_sysfs_attr_add(struct counter_device *const counter, + struct counter_attribute_group *cattr_group) +{ + const enum counter_scope scope = COUNTER_SCOPE_DEVICE; + struct device *const dev = &counter->dev; + int err; + + /* Add Signals sysfs attributes */ + err = counter_sysfs_signals_add(counter, cattr_group); + if (err < 0) + return err; + cattr_group += counter->num_signals; + + /* Add Counts sysfs attributes */ + err = counter_sysfs_counts_add(counter, cattr_group); + if (err < 0) + return err; + cattr_group += counter->num_counts; + + /* Create name attribute */ + err = counter_name_attr_create(dev, cattr_group, counter->name); + if (err < 0) + return err; + + /* Create num_signals attribute */ + err = counter_attr_create(dev, cattr_group, &counter_num_signals_comp, + scope, NULL); + if (err < 0) + return err; + + /* Create num_counts attribute */ + err = counter_attr_create(dev, cattr_group, &counter_num_counts_comp, + scope, NULL); + if (err < 0) + return err; + + /* Create events_queue_size attribute */ + err = counter_attr_create(dev, cattr_group, + &counter_events_queue_size_comp, scope, NULL); + if (err < 0) + return err; + + /* Add device extensions */ + return counter_sysfs_exts_add(dev, cattr_group, counter->ext, + counter->num_ext, scope, NULL); + + return 0; +} + +/** + * counter_sysfs_add - Adds Counter sysfs attributes to the device structure + * @counter: Pointer to the Counter device structure + * + * Counter sysfs attributes are created and added to the respective device + * structure for later registration to the system. Resource-managed memory + * allocation is performed by this function, and this memory should be freed + * when no longer needed (automatically by a device_unregister call, or + * manually by a devres_release_all call). + */ +int counter_sysfs_add(struct counter_device *const counter) +{ + struct device *const dev = &counter->dev; + const size_t num_groups = counter->num_signals + counter->num_counts + 1; + struct counter_attribute_group *cattr_groups; + size_t i, j; + int err; + struct attribute_group *groups; + struct counter_attribute *p; + + /* Allocate space for attribute groups (signals, counts, and ext) */ + cattr_groups = devm_kcalloc(dev, num_groups, sizeof(*cattr_groups), + GFP_KERNEL); + if (!cattr_groups) + return -ENOMEM; + + /* Initialize attribute lists */ + for (i = 0; i < num_groups; i++) + INIT_LIST_HEAD(&cattr_groups[i].attr_list); + + /* Add Counter device sysfs attributes */ + err = counter_sysfs_attr_add(counter, cattr_groups); + if (err < 0) + return err; + + /* Allocate attribute group pointers for association with device */ + dev->groups = devm_kcalloc(dev, num_groups + 1, sizeof(*dev->groups), + GFP_KERNEL); + if (!dev->groups) + return -ENOMEM; + + /* Allocate space for attribute groups */ + groups = devm_kcalloc(dev, num_groups, sizeof(*groups), GFP_KERNEL); + if (!groups) + return -ENOMEM; + + /* Prepare each group of attributes for association */ + for (i = 0; i < num_groups; i++) { + groups[i].name = cattr_groups[i].name; + + /* Allocate space for attribute pointers */ + groups[i].attrs = devm_kcalloc(dev, + cattr_groups[i].num_attr + 1, + sizeof(*groups[i].attrs), + GFP_KERNEL); + if (!groups[i].attrs) + return -ENOMEM; + + /* Add attribute pointers to attribute group */ + j = 0; + list_for_each_entry(p, &cattr_groups[i].attr_list, l) + groups[i].attrs[j++] = &p->dev_attr.attr; + + /* Associate attribute group */ + dev->groups[i] = &groups[i]; + } + + return 0; +} diff --git a/drivers/counter/counter-sysfs.h b/drivers/counter/counter-sysfs.h new file mode 100644 index 000000000000..14fe566aca0e --- /dev/null +++ b/drivers/counter/counter-sysfs.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Counter sysfs interface + * Copyright (C) 2020 William Breathitt Gray + */ +#ifndef _COUNTER_SYSFS_H_ +#define _COUNTER_SYSFS_H_ + +#include <linux/counter.h> + +int counter_sysfs_add(struct counter_device *const counter); + +#endif /* _COUNTER_SYSFS_H_ */ diff --git a/drivers/counter/counter.c b/drivers/counter/counter.c deleted file mode 100644 index 6a683d086008..000000000000 --- a/drivers/counter/counter.c +++ /dev/null @@ -1,1496 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Generic Counter interface - * Copyright (C) 2018 William Breathitt Gray - */ -#include <linux/counter.h> -#include <linux/device.h> -#include <linux/err.h> -#include <linux/export.h> -#include <linux/fs.h> -#include <linux/gfp.h> -#include <linux/idr.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/list.h> -#include <linux/module.h> -#include <linux/printk.h> -#include <linux/slab.h> -#include <linux/string.h> -#include <linux/sysfs.h> -#include <linux/types.h> - -const char *const counter_count_direction_str[2] = { - [COUNTER_COUNT_DIRECTION_FORWARD] = "forward", - [COUNTER_COUNT_DIRECTION_BACKWARD] = "backward" -}; -EXPORT_SYMBOL_GPL(counter_count_direction_str); - -const char *const counter_count_mode_str[4] = { - [COUNTER_COUNT_MODE_NORMAL] = "normal", - [COUNTER_COUNT_MODE_RANGE_LIMIT] = "range limit", - [COUNTER_COUNT_MODE_NON_RECYCLE] = "non-recycle", - [COUNTER_COUNT_MODE_MODULO_N] = "modulo-n" -}; -EXPORT_SYMBOL_GPL(counter_count_mode_str); - -ssize_t counter_signal_enum_read(struct counter_device *counter, - struct counter_signal *signal, void *priv, - char *buf) -{ - const struct counter_signal_enum_ext *const e = priv; - int err; - size_t index; - - if (!e->get) - return -EINVAL; - - err = e->get(counter, signal, &index); - if (err) - return err; - - if (index >= e->num_items) - return -EINVAL; - - return sprintf(buf, "%s\n", e->items[index]); -} -EXPORT_SYMBOL_GPL(counter_signal_enum_read); - -ssize_t counter_signal_enum_write(struct counter_device *counter, - struct counter_signal *signal, void *priv, - const char *buf, size_t len) -{ - const struct counter_signal_enum_ext *const e = priv; - ssize_t index; - int err; - - if (!e->set) - return -EINVAL; - - index = __sysfs_match_string(e->items, e->num_items, buf); - if (index < 0) - return index; - - err = e->set(counter, signal, index); - if (err) - return err; - - return len; -} -EXPORT_SYMBOL_GPL(counter_signal_enum_write); - -ssize_t counter_signal_enum_available_read(struct counter_device *counter, - struct counter_signal *signal, - void *priv, char *buf) -{ - const struct counter_signal_enum_ext *const e = priv; - size_t i; - size_t len = 0; - - if (!e->num_items) - return 0; - - for (i = 0; i < e->num_items; i++) - len += sprintf(buf + len, "%s\n", e->items[i]); - - return len; -} -EXPORT_SYMBOL_GPL(counter_signal_enum_available_read); - -ssize_t counter_count_enum_read(struct counter_device *counter, - struct counter_count *count, void *priv, - char *buf) -{ - const struct counter_count_enum_ext *const e = priv; - int err; - size_t index; - - if (!e->get) - return -EINVAL; - - err = e->get(counter, count, &index); - if (err) - return err; - - if (index >= e->num_items) - return -EINVAL; - - return sprintf(buf, "%s\n", e->items[index]); -} -EXPORT_SYMBOL_GPL(counter_count_enum_read); - -ssize_t counter_count_enum_write(struct counter_device *counter, - struct counter_count *count, void *priv, - const char *buf, size_t len) -{ - const struct counter_count_enum_ext *const e = priv; - ssize_t index; - int err; - - if (!e->set) - return -EINVAL; - - index = __sysfs_match_string(e->items, e->num_items, buf); - if (index < 0) - return index; - - err = e->set(counter, count, index); - if (err) - return err; - - return len; -} -EXPORT_SYMBOL_GPL(counter_count_enum_write); - -ssize_t counter_count_enum_available_read(struct counter_device *counter, - struct counter_count *count, - void *priv, char *buf) -{ - const struct counter_count_enum_ext *const e = priv; - size_t i; - size_t len = 0; - - if (!e->num_items) - return 0; - - for (i = 0; i < e->num_items; i++) - len += sprintf(buf + len, "%s\n", e->items[i]); - - return len; -} -EXPORT_SYMBOL_GPL(counter_count_enum_available_read); - -ssize_t counter_device_enum_read(struct counter_device *counter, void *priv, - char *buf) -{ - const struct counter_device_enum_ext *const e = priv; - int err; - size_t index; - - if (!e->get) - return -EINVAL; - - err = e->get(counter, &index); - if (err) - return err; - - if (index >= e->num_items) - return -EINVAL; - - return sprintf(buf, "%s\n", e->items[index]); -} -EXPORT_SYMBOL_GPL(counter_device_enum_read); - -ssize_t counter_device_enum_write(struct counter_device *counter, void *priv, - const char *buf, size_t len) -{ - const struct counter_device_enum_ext *const e = priv; - ssize_t index; - int err; - - if (!e->set) - return -EINVAL; - - index = __sysfs_match_string(e->items, e->num_items, buf); - if (index < 0) - return index; - - err = e->set(counter, index); - if (err) - return err; - - return len; -} -EXPORT_SYMBOL_GPL(counter_device_enum_write); - -ssize_t counter_device_enum_available_read(struct counter_device *counter, - void *priv, char *buf) -{ - const struct counter_device_enum_ext *const e = priv; - size_t i; - size_t len = 0; - - if (!e->num_items) - return 0; - - for (i = 0; i < e->num_items; i++) - len += sprintf(buf + len, "%s\n", e->items[i]); - - return len; -} -EXPORT_SYMBOL_GPL(counter_device_enum_available_read); - -struct counter_attr_parm { - struct counter_device_attr_group *group; - const char *prefix; - const char *name; - ssize_t (*show)(struct device *dev, struct device_attribute *attr, - char *buf); - ssize_t (*store)(struct device *dev, struct device_attribute *attr, - const char *buf, size_t len); - void *component; -}; - -struct counter_device_attr { - struct device_attribute dev_attr; - struct list_head l; - void *component; -}; - -static int counter_attribute_create(const struct counter_attr_parm *const parm) -{ - struct counter_device_attr *counter_attr; - struct device_attribute *dev_attr; - int err; - struct list_head *const attr_list = &parm->group->attr_list; - - /* Allocate a Counter device attribute */ - counter_attr = kzalloc(sizeof(*counter_attr), GFP_KERNEL); - if (!counter_attr) - return -ENOMEM; - dev_attr = &counter_attr->dev_attr; - - sysfs_attr_init(&dev_attr->attr); - - /* Configure device attribute */ - dev_attr->attr.name = kasprintf(GFP_KERNEL, "%s%s", parm->prefix, - parm->name); - if (!dev_attr->attr.name) { - err = -ENOMEM; - goto err_free_counter_attr; - } - if (parm->show) { - dev_attr->attr.mode |= 0444; - dev_attr->show = parm->show; - } - if (parm->store) { - dev_attr->attr.mode |= 0200; - dev_attr->store = parm->store; - } - - /* Store associated Counter component with attribute */ - counter_attr->component = parm->component; - - /* Keep track of the attribute for later cleanup */ - list_add(&counter_attr->l, attr_list); - parm->group->num_attr++; - - return 0; - -err_free_counter_attr: - kfree(counter_attr); - return err; -} - -#define to_counter_attr(_dev_attr) \ - container_of(_dev_attr, struct counter_device_attr, dev_attr) - -struct counter_signal_unit { - struct counter_signal *signal; -}; - -static const char *const counter_signal_value_str[] = { - [COUNTER_SIGNAL_LOW] = "low", - [COUNTER_SIGNAL_HIGH] = "high" -}; - -static ssize_t counter_signal_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct counter_device *const counter = dev_get_drvdata(dev); - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_signal_unit *const component = devattr->component; - struct counter_signal *const signal = component->signal; - int err; - enum counter_signal_value val; - - err = counter->ops->signal_read(counter, signal, &val); - if (err) - return err; - - return sprintf(buf, "%s\n", counter_signal_value_str[val]); -} - -struct counter_name_unit { - const char *name; -}; - -static ssize_t counter_device_attr_name_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - const struct counter_name_unit *const comp = to_counter_attr(attr)->component; - - return sprintf(buf, "%s\n", comp->name); -} - -static int counter_name_attribute_create( - struct counter_device_attr_group *const group, - const char *const name) -{ - struct counter_name_unit *name_comp; - struct counter_attr_parm parm; - int err; - - /* Skip if no name */ - if (!name) - return 0; - - /* Allocate name attribute component */ - name_comp = kmalloc(sizeof(*name_comp), GFP_KERNEL); - if (!name_comp) - return -ENOMEM; - name_comp->name = name; - - /* Allocate Signal name attribute */ - parm.group = group; - parm.prefix = ""; - parm.name = "name"; - parm.show = counter_device_attr_name_show; - parm.store = NULL; - parm.component = name_comp; - err = counter_attribute_create(&parm); - if (err) - goto err_free_name_comp; - - return 0; - -err_free_name_comp: - kfree(name_comp); - return err; -} - -struct counter_signal_ext_unit { - struct counter_signal *signal; - const struct counter_signal_ext *ext; -}; - -static ssize_t counter_signal_ext_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_signal_ext_unit *const comp = devattr->component; - const struct counter_signal_ext *const ext = comp->ext; - - return ext->read(dev_get_drvdata(dev), comp->signal, ext->priv, buf); -} - -static ssize_t counter_signal_ext_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_signal_ext_unit *const comp = devattr->component; - const struct counter_signal_ext *const ext = comp->ext; - - return ext->write(dev_get_drvdata(dev), comp->signal, ext->priv, buf, - len); -} - -static void counter_device_attr_list_free(struct list_head *attr_list) -{ - struct counter_device_attr *p, *n; - - list_for_each_entry_safe(p, n, attr_list, l) { - /* free attribute name and associated component memory */ - kfree(p->dev_attr.attr.name); - kfree(p->component); - list_del(&p->l); - kfree(p); - } -} - -static int counter_signal_ext_register( - struct counter_device_attr_group *const group, - struct counter_signal *const signal) -{ - const size_t num_ext = signal->num_ext; - size_t i; - const struct counter_signal_ext *ext; - struct counter_signal_ext_unit *signal_ext_comp; - struct counter_attr_parm parm; - int err; - - /* Create an attribute for each extension */ - for (i = 0 ; i < num_ext; i++) { - ext = signal->ext + i; - - /* Allocate signal_ext attribute component */ - signal_ext_comp = kmalloc(sizeof(*signal_ext_comp), GFP_KERNEL); - if (!signal_ext_comp) { - err = -ENOMEM; - goto err_free_attr_list; - } - signal_ext_comp->signal = signal; - signal_ext_comp->ext = ext; - - /* Allocate a Counter device attribute */ - parm.group = group; - parm.prefix = ""; - parm.name = ext->name; - parm.show = (ext->read) ? counter_signal_ext_show : NULL; - parm.store = (ext->write) ? counter_signal_ext_store : NULL; - parm.component = signal_ext_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(signal_ext_comp); - goto err_free_attr_list; - } - } - - return 0; - -err_free_attr_list: - counter_device_attr_list_free(&group->attr_list); - return err; -} - -static int counter_signal_attributes_create( - struct counter_device_attr_group *const group, - const struct counter_device *const counter, - struct counter_signal *const signal) -{ - struct counter_signal_unit *signal_comp; - struct counter_attr_parm parm; - int err; - - /* Allocate Signal attribute component */ - signal_comp = kmalloc(sizeof(*signal_comp), GFP_KERNEL); - if (!signal_comp) - return -ENOMEM; - signal_comp->signal = signal; - - /* Create main Signal attribute */ - parm.group = group; - parm.prefix = ""; - parm.name = "signal"; - parm.show = (counter->ops->signal_read) ? counter_signal_show : NULL; - parm.store = NULL; - parm.component = signal_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(signal_comp); - return err; - } - - /* Create Signal name attribute */ - err = counter_name_attribute_create(group, signal->name); - if (err) - goto err_free_attr_list; - - /* Register Signal extension attributes */ - err = counter_signal_ext_register(group, signal); - if (err) - goto err_free_attr_list; - - return 0; - -err_free_attr_list: - counter_device_attr_list_free(&group->attr_list); - return err; -} - -static int counter_signals_register( - struct counter_device_attr_group *const groups_list, - const struct counter_device *const counter) -{ - const size_t num_signals = counter->num_signals; - size_t i; - struct counter_signal *signal; - const char *name; - int err; - - /* Register each Signal */ - for (i = 0; i < num_signals; i++) { - signal = counter->signals + i; - - /* Generate Signal attribute directory name */ - name = kasprintf(GFP_KERNEL, "signal%d", signal->id); - if (!name) { - err = -ENOMEM; - goto err_free_attr_groups; - } - groups_list[i].attr_group.name = name; - - /* Create all attributes associated with Signal */ - err = counter_signal_attributes_create(groups_list + i, counter, - signal); - if (err) - goto err_free_attr_groups; - } - - return 0; - -err_free_attr_groups: - do { - kfree(groups_list[i].attr_group.name); - counter_device_attr_list_free(&groups_list[i].attr_list); - } while (i--); - return err; -} - -static const char *const counter_synapse_action_str[] = { - [COUNTER_SYNAPSE_ACTION_NONE] = "none", - [COUNTER_SYNAPSE_ACTION_RISING_EDGE] = "rising edge", - [COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = "falling edge", - [COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = "both edges" -}; - -struct counter_action_unit { - struct counter_synapse *synapse; - struct counter_count *count; -}; - -static ssize_t counter_action_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - int err; - struct counter_device *const counter = dev_get_drvdata(dev); - const struct counter_action_unit *const component = devattr->component; - struct counter_count *const count = component->count; - struct counter_synapse *const synapse = component->synapse; - size_t action_index; - enum counter_synapse_action action; - - err = counter->ops->action_get(counter, count, synapse, &action_index); - if (err) - return err; - - synapse->action = action_index; - - action = synapse->actions_list[action_index]; - return sprintf(buf, "%s\n", counter_synapse_action_str[action]); -} - -static ssize_t counter_action_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_action_unit *const component = devattr->component; - struct counter_synapse *const synapse = component->synapse; - size_t action_index; - const size_t num_actions = synapse->num_actions; - enum counter_synapse_action action; - int err; - struct counter_device *const counter = dev_get_drvdata(dev); - struct counter_count *const count = component->count; - - /* Find requested action mode */ - for (action_index = 0; action_index < num_actions; action_index++) { - action = synapse->actions_list[action_index]; - if (sysfs_streq(buf, counter_synapse_action_str[action])) - break; - } - /* If requested action mode not found */ - if (action_index >= num_actions) - return -EINVAL; - - err = counter->ops->action_set(counter, count, synapse, action_index); - if (err) - return err; - - synapse->action = action_index; - - return len; -} - -struct counter_action_avail_unit { - const enum counter_synapse_action *actions_list; - size_t num_actions; -}; - -static ssize_t counter_synapse_action_available_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_action_avail_unit *const component = devattr->component; - size_t i; - enum counter_synapse_action action; - ssize_t len = 0; - - for (i = 0; i < component->num_actions; i++) { - action = component->actions_list[i]; - len += sprintf(buf + len, "%s\n", - counter_synapse_action_str[action]); - } - - return len; -} - -static int counter_synapses_register( - struct counter_device_attr_group *const group, - const struct counter_device *const counter, - struct counter_count *const count, const char *const count_attr_name) -{ - size_t i; - struct counter_synapse *synapse; - const char *prefix; - struct counter_action_unit *action_comp; - struct counter_attr_parm parm; - int err; - struct counter_action_avail_unit *avail_comp; - - /* Register each Synapse */ - for (i = 0; i < count->num_synapses; i++) { - synapse = count->synapses + i; - - /* Generate attribute prefix */ - prefix = kasprintf(GFP_KERNEL, "signal%d_", - synapse->signal->id); - if (!prefix) { - err = -ENOMEM; - goto err_free_attr_list; - } - - /* Allocate action attribute component */ - action_comp = kmalloc(sizeof(*action_comp), GFP_KERNEL); - if (!action_comp) { - err = -ENOMEM; - goto err_free_prefix; - } - action_comp->synapse = synapse; - action_comp->count = count; - - /* Create action attribute */ - parm.group = group; - parm.prefix = prefix; - parm.name = "action"; - parm.show = (counter->ops->action_get) ? counter_action_show : NULL; - parm.store = (counter->ops->action_set) ? counter_action_store : NULL; - parm.component = action_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(action_comp); - goto err_free_prefix; - } - - /* Allocate action available attribute component */ - avail_comp = kmalloc(sizeof(*avail_comp), GFP_KERNEL); - if (!avail_comp) { - err = -ENOMEM; - goto err_free_prefix; - } - avail_comp->actions_list = synapse->actions_list; - avail_comp->num_actions = synapse->num_actions; - - /* Create action_available attribute */ - parm.group = group; - parm.prefix = prefix; - parm.name = "action_available"; - parm.show = counter_synapse_action_available_show; - parm.store = NULL; - parm.component = avail_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(avail_comp); - goto err_free_prefix; - } - - kfree(prefix); - } - - return 0; - -err_free_prefix: - kfree(prefix); -err_free_attr_list: - counter_device_attr_list_free(&group->attr_list); - return err; -} - -struct counter_count_unit { - struct counter_count *count; -}; - -static ssize_t counter_count_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct counter_device *const counter = dev_get_drvdata(dev); - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_count_unit *const component = devattr->component; - struct counter_count *const count = component->count; - int err; - unsigned long val; - - err = counter->ops->count_read(counter, count, &val); - if (err) - return err; - - return sprintf(buf, "%lu\n", val); -} - -static ssize_t counter_count_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - struct counter_device *const counter = dev_get_drvdata(dev); - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_count_unit *const component = devattr->component; - struct counter_count *const count = component->count; - int err; - unsigned long val; - - err = kstrtoul(buf, 0, &val); - if (err) - return err; - - err = counter->ops->count_write(counter, count, val); - if (err) - return err; - - return len; -} - -static const char *const counter_count_function_str[] = { - [COUNTER_COUNT_FUNCTION_INCREASE] = "increase", - [COUNTER_COUNT_FUNCTION_DECREASE] = "decrease", - [COUNTER_COUNT_FUNCTION_PULSE_DIRECTION] = "pulse-direction", - [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A] = "quadrature x1 a", - [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b", - [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a", - [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b", - [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4" -}; - -static ssize_t counter_function_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - int err; - struct counter_device *const counter = dev_get_drvdata(dev); - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_count_unit *const component = devattr->component; - struct counter_count *const count = component->count; - size_t func_index; - enum counter_count_function function; - - err = counter->ops->function_get(counter, count, &func_index); - if (err) - return err; - - count->function = func_index; - - function = count->functions_list[func_index]; - return sprintf(buf, "%s\n", counter_count_function_str[function]); -} - -static ssize_t counter_function_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_count_unit *const component = devattr->component; - struct counter_count *const count = component->count; - const size_t num_functions = count->num_functions; - size_t func_index; - enum counter_count_function function; - int err; - struct counter_device *const counter = dev_get_drvdata(dev); - - /* Find requested Count function mode */ - for (func_index = 0; func_index < num_functions; func_index++) { - function = count->functions_list[func_index]; - if (sysfs_streq(buf, counter_count_function_str[function])) - break; - } - /* Return error if requested Count function mode not found */ - if (func_index >= num_functions) - return -EINVAL; - - err = counter->ops->function_set(counter, count, func_index); - if (err) - return err; - - count->function = func_index; - - return len; -} - -struct counter_count_ext_unit { - struct counter_count *count; - const struct counter_count_ext *ext; -}; - -static ssize_t counter_count_ext_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_count_ext_unit *const comp = devattr->component; - const struct counter_count_ext *const ext = comp->ext; - - return ext->read(dev_get_drvdata(dev), comp->count, ext->priv, buf); -} - -static ssize_t counter_count_ext_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_count_ext_unit *const comp = devattr->component; - const struct counter_count_ext *const ext = comp->ext; - - return ext->write(dev_get_drvdata(dev), comp->count, ext->priv, buf, - len); -} - -static int counter_count_ext_register( - struct counter_device_attr_group *const group, - struct counter_count *const count) -{ - size_t i; - const struct counter_count_ext *ext; - struct counter_count_ext_unit *count_ext_comp; - struct counter_attr_parm parm; - int err; - - /* Create an attribute for each extension */ - for (i = 0 ; i < count->num_ext; i++) { - ext = count->ext + i; - - /* Allocate count_ext attribute component */ - count_ext_comp = kmalloc(sizeof(*count_ext_comp), GFP_KERNEL); - if (!count_ext_comp) { - err = -ENOMEM; - goto err_free_attr_list; - } - count_ext_comp->count = count; - count_ext_comp->ext = ext; - - /* Allocate count_ext attribute */ - parm.group = group; - parm.prefix = ""; - parm.name = ext->name; - parm.show = (ext->read) ? counter_count_ext_show : NULL; - parm.store = (ext->write) ? counter_count_ext_store : NULL; - parm.component = count_ext_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(count_ext_comp); - goto err_free_attr_list; - } - } - - return 0; - -err_free_attr_list: - counter_device_attr_list_free(&group->attr_list); - return err; -} - -struct counter_func_avail_unit { - const enum counter_count_function *functions_list; - size_t num_functions; -}; - -static ssize_t counter_count_function_available_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_func_avail_unit *const component = devattr->component; - const enum counter_count_function *const func_list = component->functions_list; - const size_t num_functions = component->num_functions; - size_t i; - enum counter_count_function function; - ssize_t len = 0; - - for (i = 0; i < num_functions; i++) { - function = func_list[i]; - len += sprintf(buf + len, "%s\n", - counter_count_function_str[function]); - } - - return len; -} - -static int counter_count_attributes_create( - struct counter_device_attr_group *const group, - const struct counter_device *const counter, - struct counter_count *const count) -{ - struct counter_count_unit *count_comp; - struct counter_attr_parm parm; - int err; - struct counter_count_unit *func_comp; - struct counter_func_avail_unit *avail_comp; - - /* Allocate count attribute component */ - count_comp = kmalloc(sizeof(*count_comp), GFP_KERNEL); - if (!count_comp) - return -ENOMEM; - count_comp->count = count; - - /* Create main Count attribute */ - parm.group = group; - parm.prefix = ""; - parm.name = "count"; - parm.show = (counter->ops->count_read) ? counter_count_show : NULL; - parm.store = (counter->ops->count_write) ? counter_count_store : NULL; - parm.component = count_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(count_comp); - return err; - } - - /* Allocate function attribute component */ - func_comp = kmalloc(sizeof(*func_comp), GFP_KERNEL); - if (!func_comp) { - err = -ENOMEM; - goto err_free_attr_list; - } - func_comp->count = count; - - /* Create Count function attribute */ - parm.group = group; - parm.prefix = ""; - parm.name = "function"; - parm.show = (counter->ops->function_get) ? counter_function_show : NULL; - parm.store = (counter->ops->function_set) ? counter_function_store : NULL; - parm.component = func_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(func_comp); - goto err_free_attr_list; - } - - /* Allocate function available attribute component */ - avail_comp = kmalloc(sizeof(*avail_comp), GFP_KERNEL); - if (!avail_comp) { - err = -ENOMEM; - goto err_free_attr_list; - } - avail_comp->functions_list = count->functions_list; - avail_comp->num_functions = count->num_functions; - - /* Create Count function_available attribute */ - parm.group = group; - parm.prefix = ""; - parm.name = "function_available"; - parm.show = counter_count_function_available_show; - parm.store = NULL; - parm.component = avail_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(avail_comp); - goto err_free_attr_list; - } - - /* Create Count name attribute */ - err = counter_name_attribute_create(group, count->name); - if (err) - goto err_free_attr_list; - - /* Register Count extension attributes */ - err = counter_count_ext_register(group, count); - if (err) - goto err_free_attr_list; - - return 0; - -err_free_attr_list: - counter_device_attr_list_free(&group->attr_list); - return err; -} - -static int counter_counts_register( - struct counter_device_attr_group *const groups_list, - const struct counter_device *const counter) -{ - size_t i; - struct counter_count *count; - const char *name; - int err; - - /* Register each Count */ - for (i = 0; i < counter->num_counts; i++) { - count = counter->counts + i; - - /* Generate Count attribute directory name */ - name = kasprintf(GFP_KERNEL, "count%d", count->id); - if (!name) { - err = -ENOMEM; - goto err_free_attr_groups; - } - groups_list[i].attr_group.name = name; - - /* Register the Synapses associated with each Count */ - err = counter_synapses_register(groups_list + i, counter, count, - name); - if (err) - goto err_free_attr_groups; - - /* Create all attributes associated with Count */ - err = counter_count_attributes_create(groups_list + i, counter, - count); - if (err) - goto err_free_attr_groups; - } - - return 0; - -err_free_attr_groups: - do { - kfree(groups_list[i].attr_group.name); - counter_device_attr_list_free(&groups_list[i].attr_list); - } while (i--); - return err; -} - -struct counter_size_unit { - size_t size; -}; - -static ssize_t counter_device_attr_size_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - const struct counter_size_unit *const comp = to_counter_attr(attr)->component; - - return sprintf(buf, "%zu\n", comp->size); -} - -static int counter_size_attribute_create( - struct counter_device_attr_group *const group, - const size_t size, const char *const name) -{ - struct counter_size_unit *size_comp; - struct counter_attr_parm parm; - int err; - - /* Allocate size attribute component */ - size_comp = kmalloc(sizeof(*size_comp), GFP_KERNEL); - if (!size_comp) - return -ENOMEM; - size_comp->size = size; - - parm.group = group; - parm.prefix = ""; - parm.name = name; - parm.show = counter_device_attr_size_show; - parm.store = NULL; - parm.component = size_comp; - err = counter_attribute_create(&parm); - if (err) - goto err_free_size_comp; - - return 0; - -err_free_size_comp: - kfree(size_comp); - return err; -} - -struct counter_ext_unit { - const struct counter_device_ext *ext; -}; - -static ssize_t counter_device_ext_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_ext_unit *const component = devattr->component; - const struct counter_device_ext *const ext = component->ext; - - return ext->read(dev_get_drvdata(dev), ext->priv, buf); -} - -static ssize_t counter_device_ext_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - const struct counter_device_attr *const devattr = to_counter_attr(attr); - const struct counter_ext_unit *const component = devattr->component; - const struct counter_device_ext *const ext = component->ext; - - return ext->write(dev_get_drvdata(dev), ext->priv, buf, len); -} - -static int counter_device_ext_register( - struct counter_device_attr_group *const group, - struct counter_device *const counter) -{ - size_t i; - struct counter_ext_unit *ext_comp; - struct counter_attr_parm parm; - int err; - - /* Create an attribute for each extension */ - for (i = 0 ; i < counter->num_ext; i++) { - /* Allocate extension attribute component */ - ext_comp = kmalloc(sizeof(*ext_comp), GFP_KERNEL); - if (!ext_comp) { - err = -ENOMEM; - goto err_free_attr_list; - } - - ext_comp->ext = counter->ext + i; - - /* Allocate extension attribute */ - parm.group = group; - parm.prefix = ""; - parm.name = counter->ext[i].name; - parm.show = (counter->ext[i].read) ? counter_device_ext_show : NULL; - parm.store = (counter->ext[i].write) ? counter_device_ext_store : NULL; - parm.component = ext_comp; - err = counter_attribute_create(&parm); - if (err) { - kfree(ext_comp); - goto err_free_attr_list; - } - } - - return 0; - -err_free_attr_list: - counter_device_attr_list_free(&group->attr_list); - return err; -} - -static int counter_global_attr_register( - struct counter_device_attr_group *const group, - struct counter_device *const counter) -{ - int err; - - /* Create name attribute */ - err = counter_name_attribute_create(group, counter->name); - if (err) - return err; - - /* Create num_counts attribute */ - err = counter_size_attribute_create(group, counter->num_counts, - "num_counts"); - if (err) - goto err_free_attr_list; - - /* Create num_signals attribute */ - err = counter_size_attribute_create(group, counter->num_signals, - "num_signals"); - if (err) - goto err_free_attr_list; - - /* Register Counter device extension attributes */ - err = counter_device_ext_register(group, counter); - if (err) - goto err_free_attr_list; - - return 0; - -err_free_attr_list: - counter_device_attr_list_free(&group->attr_list); - return err; -} - -static void counter_device_groups_list_free( - struct counter_device_attr_group *const groups_list, - const size_t num_groups) -{ - struct counter_device_attr_group *group; - size_t i; - - /* loop through all attribute groups (signals, counts, global, etc.) */ - for (i = 0; i < num_groups; i++) { - group = groups_list + i; - - /* free all attribute group and associated attributes memory */ - kfree(group->attr_group.name); - kfree(group->attr_group.attrs); - counter_device_attr_list_free(&group->attr_list); - } - - kfree(groups_list); -} - -static int counter_device_groups_list_prepare( - struct counter_device *const counter) -{ - const size_t total_num_groups = - counter->num_signals + counter->num_counts + 1; - struct counter_device_attr_group *groups_list; - size_t i; - int err; - size_t num_groups = 0; - - /* Allocate space for attribute groups (signals, counts, and ext) */ - groups_list = kcalloc(total_num_groups, sizeof(*groups_list), - GFP_KERNEL); - if (!groups_list) - return -ENOMEM; - - /* Initialize attribute lists */ - for (i = 0; i < total_num_groups; i++) - INIT_LIST_HEAD(&groups_list[i].attr_list); - - /* Register Signals */ - err = counter_signals_register(groups_list, counter); - if (err) - goto err_free_groups_list; - num_groups += counter->num_signals; - - /* Register Counts and respective Synapses */ - err = counter_counts_register(groups_list + num_groups, counter); - if (err) - goto err_free_groups_list; - num_groups += counter->num_counts; - - /* Register Counter global attributes */ - err = counter_global_attr_register(groups_list + num_groups, counter); - if (err) - goto err_free_groups_list; - num_groups++; - - /* Store groups_list in device_state */ - counter->device_state->groups_list = groups_list; - counter->device_state->num_groups = num_groups; - - return 0; - -err_free_groups_list: - counter_device_groups_list_free(groups_list, num_groups); - return err; -} - -static int counter_device_groups_prepare( - struct counter_device_state *const device_state) -{ - size_t i, j; - struct counter_device_attr_group *group; - int err; - struct counter_device_attr *p; - - /* Allocate attribute groups for association with device */ - device_state->groups = kcalloc(device_state->num_groups + 1, - sizeof(*device_state->groups), - GFP_KERNEL); - if (!device_state->groups) - return -ENOMEM; - - /* Prepare each group of attributes for association */ - for (i = 0; i < device_state->num_groups; i++) { - group = device_state->groups_list + i; - - /* Allocate space for attribute pointers in attribute group */ - group->attr_group.attrs = kcalloc(group->num_attr + 1, - sizeof(*group->attr_group.attrs), GFP_KERNEL); - if (!group->attr_group.attrs) { - err = -ENOMEM; - goto err_free_groups; - } - - /* Add attribute pointers to attribute group */ - j = 0; - list_for_each_entry(p, &group->attr_list, l) - group->attr_group.attrs[j++] = &p->dev_attr.attr; - - /* Group attributes in attribute group */ - device_state->groups[i] = &group->attr_group; - } - /* Associate attributes with device */ - device_state->dev.groups = device_state->groups; - - return 0; - -err_free_groups: - do { - group = device_state->groups_list + i; - kfree(group->attr_group.attrs); - group->attr_group.attrs = NULL; - } while (i--); - kfree(device_state->groups); - return err; -} - -/* Provides a unique ID for each counter device */ -static DEFINE_IDA(counter_ida); - -static void counter_device_release(struct device *dev) -{ - struct counter_device *const counter = dev_get_drvdata(dev); - struct counter_device_state *const device_state = counter->device_state; - - kfree(device_state->groups); - counter_device_groups_list_free(device_state->groups_list, - device_state->num_groups); - ida_simple_remove(&counter_ida, device_state->id); - kfree(device_state); -} - -static struct device_type counter_device_type = { - .name = "counter_device", - .release = counter_device_release -}; - -static struct bus_type counter_bus_type = { - .name = "counter" -}; - -/** - * counter_register - register Counter to the system - * @counter: pointer to Counter to register - * - * This function registers a Counter to the system. A sysfs "counter" directory - * will be created and populated with sysfs attributes correlating with the - * Counter Signals, Synapses, and Counts respectively. - */ -int counter_register(struct counter_device *const counter) -{ - struct counter_device_state *device_state; - int err; - - /* Allocate internal state container for Counter device */ - device_state = kzalloc(sizeof(*device_state), GFP_KERNEL); - if (!device_state) - return -ENOMEM; - counter->device_state = device_state; - - /* Acquire unique ID */ - device_state->id = ida_simple_get(&counter_ida, 0, 0, GFP_KERNEL); - if (device_state->id < 0) { - err = device_state->id; - goto err_free_device_state; - } - - /* Configure device structure for Counter */ - device_state->dev.type = &counter_device_type; - device_state->dev.bus = &counter_bus_type; - if (counter->parent) { - device_state->dev.parent = counter->parent; - device_state->dev.of_node = counter->parent->of_node; - } - dev_set_name(&device_state->dev, "counter%d", device_state->id); - device_initialize(&device_state->dev); - dev_set_drvdata(&device_state->dev, counter); - - /* Prepare device attributes */ - err = counter_device_groups_list_prepare(counter); - if (err) - goto err_free_id; - - /* Organize device attributes to groups and match to device */ - err = counter_device_groups_prepare(device_state); - if (err) - goto err_free_groups_list; - - /* Add device to system */ - err = device_add(&device_state->dev); - if (err) - goto err_free_groups; - - return 0; - -err_free_groups: - kfree(device_state->groups); -err_free_groups_list: - counter_device_groups_list_free(device_state->groups_list, - device_state->num_groups); -err_free_id: - ida_simple_remove(&counter_ida, device_state->id); -err_free_device_state: - kfree(device_state); - return err; -} -EXPORT_SYMBOL_GPL(counter_register); - -/** - * counter_unregister - unregister Counter from the system - * @counter: pointer to Counter to unregister - * - * The Counter is unregistered from the system; all allocated memory is freed. - */ -void counter_unregister(struct counter_device *const counter) -{ - if (counter) - device_del(&counter->device_state->dev); -} -EXPORT_SYMBOL_GPL(counter_unregister); - -static void devm_counter_unreg(struct device *dev, void *res) -{ - counter_unregister(*(struct counter_device **)res); -} - -/** - * devm_counter_register - Resource-managed counter_register - * @dev: device to allocate counter_device for - * @counter: pointer to Counter to register - * - * Managed counter_register. The Counter registered with this function is - * automatically unregistered on driver detach. This function calls - * counter_register internally. Refer to that function for more information. - * - * If an Counter registered with this function needs to be unregistered - * separately, devm_counter_unregister must be used. - * - * RETURNS: - * 0 on success, negative error number on failure. - */ -int devm_counter_register(struct device *dev, - struct counter_device *const counter) -{ - struct counter_device **ptr; - int ret; - - ptr = devres_alloc(devm_counter_unreg, sizeof(*ptr), GFP_KERNEL); - if (!ptr) - return -ENOMEM; - - ret = counter_register(counter); - if (!ret) { - *ptr = counter; - devres_add(dev, ptr); - } else { - devres_free(ptr); - } - - return ret; -} -EXPORT_SYMBOL_GPL(devm_counter_register); - -static int devm_counter_match(struct device *dev, void *res, void *data) -{ - struct counter_device **r = res; - - if (!r || !*r) { - WARN_ON(!r || !*r); - return 0; - } - - return *r == data; -} - -/** - * devm_counter_unregister - Resource-managed counter_unregister - * @dev: device this counter_device belongs to - * @counter: pointer to Counter associated with the device - * - * Unregister Counter registered with devm_counter_register. - */ -void devm_counter_unregister(struct device *dev, - struct counter_device *const counter) -{ - int rc; - - rc = devres_release(dev, devm_counter_unreg, devm_counter_match, - counter); - WARN_ON(rc); -} -EXPORT_SYMBOL_GPL(devm_counter_unregister); - -static int __init counter_init(void) -{ - return bus_register(&counter_bus_type); -} - -static void __exit counter_exit(void) -{ - bus_unregister(&counter_bus_type); -} - -subsys_initcall(counter_init); -module_exit(counter_exit); - -MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); -MODULE_DESCRIPTION("Generic Counter interface"); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c index c2b3fdfd8b77..aea6622a9b13 100644 --- a/drivers/counter/ftm-quaddec.c +++ b/drivers/counter/ftm-quaddec.c @@ -14,6 +14,7 @@ #include <linux/mutex.h> #include <linux/counter.h> #include <linux/bitfield.h> +#include <linux/types.h> #define FTM_FIELD_UPDATE(ftm, offset, mask, val) \ ({ \ @@ -25,7 +26,6 @@ }) struct ftm_quaddec { - struct counter_device counter; struct platform_device *pdev; void __iomem *ftm_base; bool big_endian; @@ -115,10 +115,9 @@ static void ftm_quaddec_disable(void *ftm) } static int ftm_quaddec_get_prescaler(struct counter_device *counter, - struct counter_count *count, - size_t *cnt_mode) + struct counter_count *count, u32 *cnt_mode) { - struct ftm_quaddec *ftm = counter->priv; + struct ftm_quaddec *ftm = counter_priv(counter); uint32_t scflags; ftm_read(ftm, FTM_SC, &scflags); @@ -129,10 +128,9 @@ static int ftm_quaddec_get_prescaler(struct counter_device *counter, } static int ftm_quaddec_set_prescaler(struct counter_device *counter, - struct counter_count *count, - size_t cnt_mode) + struct counter_count *count, u32 cnt_mode) { - struct ftm_quaddec *ftm = counter->priv; + struct ftm_quaddec *ftm = counter_priv(counter); mutex_lock(&ftm->ftm_quaddec_mutex); @@ -151,36 +149,19 @@ static const char * const ftm_quaddec_prescaler[] = { "1", "2", "4", "8", "16", "32", "64", "128" }; -static struct counter_count_enum_ext ftm_quaddec_prescaler_enum = { - .items = ftm_quaddec_prescaler, - .num_items = ARRAY_SIZE(ftm_quaddec_prescaler), - .get = ftm_quaddec_get_prescaler, - .set = ftm_quaddec_set_prescaler -}; - -enum ftm_quaddec_synapse_action { - FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES, -}; - -static enum counter_synapse_action ftm_quaddec_synapse_actions[] = { - [FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES] = +static const enum counter_synapse_action ftm_quaddec_synapse_actions[] = { COUNTER_SYNAPSE_ACTION_BOTH_EDGES }; -enum ftm_quaddec_count_function { - FTM_QUADDEC_COUNT_ENCODER_MODE_1, -}; - -static const enum counter_count_function ftm_quaddec_count_functions[] = { - [FTM_QUADDEC_COUNT_ENCODER_MODE_1] = - COUNTER_COUNT_FUNCTION_QUADRATURE_X4 +static const enum counter_function ftm_quaddec_count_functions[] = { + COUNTER_FUNCTION_QUADRATURE_X4 }; static int ftm_quaddec_count_read(struct counter_device *counter, struct counter_count *count, - unsigned long *val) + u64 *val) { - struct ftm_quaddec *const ftm = counter->priv; + struct ftm_quaddec *const ftm = counter_priv(counter); uint32_t cntval; ftm_read(ftm, FTM_CNT, &cntval); @@ -192,9 +173,9 @@ static int ftm_quaddec_count_read(struct counter_device *counter, static int ftm_quaddec_count_write(struct counter_device *counter, struct counter_count *count, - const unsigned long val) + const u64 val) { - struct ftm_quaddec *const ftm = counter->priv; + struct ftm_quaddec *const ftm = counter_priv(counter); if (val != 0) { dev_warn(&ftm->pdev->dev, "Can only accept '0' as new counter value\n"); @@ -206,21 +187,21 @@ static int ftm_quaddec_count_write(struct counter_device *counter, return 0; } -static int ftm_quaddec_count_function_get(struct counter_device *counter, - struct counter_count *count, - size_t *function) +static int ftm_quaddec_count_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) { - *function = FTM_QUADDEC_COUNT_ENCODER_MODE_1; + *function = COUNTER_FUNCTION_QUADRATURE_X4; return 0; } -static int ftm_quaddec_action_get(struct counter_device *counter, - struct counter_count *count, - struct counter_synapse *synapse, - size_t *action) +static int ftm_quaddec_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) { - *action = FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES; + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; return 0; } @@ -228,8 +209,8 @@ static int ftm_quaddec_action_get(struct counter_device *counter, static const struct counter_ops ftm_quaddec_cnt_ops = { .count_read = ftm_quaddec_count_read, .count_write = ftm_quaddec_count_write, - .function_get = ftm_quaddec_count_function_get, - .action_get = ftm_quaddec_action_get, + .function_read = ftm_quaddec_count_function_read, + .action_read = ftm_quaddec_action_read, }; static struct counter_signal ftm_quaddec_signals[] = { @@ -256,9 +237,12 @@ static struct counter_synapse ftm_quaddec_count_synapses[] = { } }; -static const struct counter_count_ext ftm_quaddec_count_ext[] = { - COUNTER_COUNT_ENUM("prescaler", &ftm_quaddec_prescaler_enum), - COUNTER_COUNT_ENUM_AVAILABLE("prescaler", &ftm_quaddec_prescaler_enum), +static DEFINE_COUNTER_ENUM(ftm_quaddec_prescaler_enum, ftm_quaddec_prescaler); + +static struct counter_comp ftm_quaddec_count_ext[] = { + COUNTER_COMP_COUNT_ENUM("prescaler", ftm_quaddec_get_prescaler, + ftm_quaddec_set_prescaler, + ftm_quaddec_prescaler_enum), }; static struct counter_count ftm_quaddec_counts = { @@ -274,17 +258,17 @@ static struct counter_count ftm_quaddec_counts = { static int ftm_quaddec_probe(struct platform_device *pdev) { + struct counter_device *counter; struct ftm_quaddec *ftm; struct device_node *node = pdev->dev.of_node; struct resource *io; int ret; - ftm = devm_kzalloc(&pdev->dev, sizeof(*ftm), GFP_KERNEL); - if (!ftm) + counter = devm_counter_alloc(&pdev->dev, sizeof(*ftm)); + if (!counter) return -ENOMEM; - - platform_set_drvdata(pdev, ftm); + ftm = counter_priv(counter); io = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!io) { @@ -300,14 +284,13 @@ static int ftm_quaddec_probe(struct platform_device *pdev) dev_err(&pdev->dev, "Failed to map memory region\n"); return -EINVAL; } - ftm->counter.name = dev_name(&pdev->dev); - ftm->counter.parent = &pdev->dev; - ftm->counter.ops = &ftm_quaddec_cnt_ops; - ftm->counter.counts = &ftm_quaddec_counts; - ftm->counter.num_counts = 1; - ftm->counter.signals = ftm_quaddec_signals; - ftm->counter.num_signals = ARRAY_SIZE(ftm_quaddec_signals); - ftm->counter.priv = ftm; + counter->name = dev_name(&pdev->dev); + counter->parent = &pdev->dev; + counter->ops = &ftm_quaddec_cnt_ops; + counter->counts = &ftm_quaddec_counts; + counter->num_counts = 1; + counter->signals = ftm_quaddec_signals; + counter->num_signals = ARRAY_SIZE(ftm_quaddec_signals); mutex_init(&ftm->ftm_quaddec_mutex); @@ -317,9 +300,9 @@ static int ftm_quaddec_probe(struct platform_device *pdev) if (ret) return ret; - ret = devm_counter_register(&pdev->dev, &ftm->counter); + ret = devm_counter_add(&pdev->dev, counter); if (ret) - return ret; + return dev_err_probe(&pdev->dev, ret, "Failed to add counter\n"); return 0; } @@ -342,3 +325,4 @@ module_platform_driver(ftm_quaddec_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Kjeld Flarup <kfa@deif.com>"); MODULE_AUTHOR("Patrick Havelange <patrick.havelange@essensium.com>"); +MODULE_IMPORT_NS(COUNTER); diff --git a/drivers/counter/intel-qep.c b/drivers/counter/intel-qep.c new file mode 100644 index 000000000000..af5942e66f7d --- /dev/null +++ b/drivers/counter/intel-qep.c @@ -0,0 +1,526 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel Quadrature Encoder Peripheral driver + * + * Copyright (C) 2019-2021 Intel Corporation + * + * Author: Felipe Balbi (Intel) + * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com> + * Author: Raymond Tan <raymond.tan@intel.com> + */ +#include <linux/counter.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/pci.h> +#include <linux/pm_runtime.h> + +#define INTEL_QEPCON 0x00 +#define INTEL_QEPFLT 0x04 +#define INTEL_QEPCOUNT 0x08 +#define INTEL_QEPMAX 0x0c +#define INTEL_QEPWDT 0x10 +#define INTEL_QEPCAPDIV 0x14 +#define INTEL_QEPCNTR 0x18 +#define INTEL_QEPCAPBUF 0x1c +#define INTEL_QEPINT_STAT 0x20 +#define INTEL_QEPINT_MASK 0x24 + +/* QEPCON */ +#define INTEL_QEPCON_EN BIT(0) +#define INTEL_QEPCON_FLT_EN BIT(1) +#define INTEL_QEPCON_EDGE_A BIT(2) +#define INTEL_QEPCON_EDGE_B BIT(3) +#define INTEL_QEPCON_EDGE_INDX BIT(4) +#define INTEL_QEPCON_SWPAB BIT(5) +#define INTEL_QEPCON_OP_MODE BIT(6) +#define INTEL_QEPCON_PH_ERR BIT(7) +#define INTEL_QEPCON_COUNT_RST_MODE BIT(8) +#define INTEL_QEPCON_INDX_GATING_MASK GENMASK(10, 9) +#define INTEL_QEPCON_INDX_GATING(n) (((n) & 3) << 9) +#define INTEL_QEPCON_INDX_PAL_PBL INTEL_QEPCON_INDX_GATING(0) +#define INTEL_QEPCON_INDX_PAL_PBH INTEL_QEPCON_INDX_GATING(1) +#define INTEL_QEPCON_INDX_PAH_PBL INTEL_QEPCON_INDX_GATING(2) +#define INTEL_QEPCON_INDX_PAH_PBH INTEL_QEPCON_INDX_GATING(3) +#define INTEL_QEPCON_CAP_MODE BIT(11) +#define INTEL_QEPCON_FIFO_THRE_MASK GENMASK(14, 12) +#define INTEL_QEPCON_FIFO_THRE(n) ((((n) - 1) & 7) << 12) +#define INTEL_QEPCON_FIFO_EMPTY BIT(15) + +/* QEPFLT */ +#define INTEL_QEPFLT_MAX_COUNT(n) ((n) & 0x1fffff) + +/* QEPINT */ +#define INTEL_QEPINT_FIFOCRIT BIT(5) +#define INTEL_QEPINT_FIFOENTRY BIT(4) +#define INTEL_QEPINT_QEPDIR BIT(3) +#define INTEL_QEPINT_QEPRST_UP BIT(2) +#define INTEL_QEPINT_QEPRST_DOWN BIT(1) +#define INTEL_QEPINT_WDT BIT(0) + +#define INTEL_QEPINT_MASK_ALL GENMASK(5, 0) + +#define INTEL_QEP_CLK_PERIOD_NS 10 + +struct intel_qep { + struct mutex lock; + struct device *dev; + void __iomem *regs; + bool enabled; + /* Context save registers */ + u32 qepcon; + u32 qepflt; + u32 qepmax; +}; + +static inline u32 intel_qep_readl(struct intel_qep *qep, u32 offset) +{ + return readl(qep->regs + offset); +} + +static inline void intel_qep_writel(struct intel_qep *qep, + u32 offset, u32 value) +{ + writel(value, qep->regs + offset); +} + +static void intel_qep_init(struct intel_qep *qep) +{ + u32 reg; + + reg = intel_qep_readl(qep, INTEL_QEPCON); + reg &= ~INTEL_QEPCON_EN; + intel_qep_writel(qep, INTEL_QEPCON, reg); + qep->enabled = false; + /* + * Make sure peripheral is disabled by flushing the write with + * a dummy read + */ + reg = intel_qep_readl(qep, INTEL_QEPCON); + + reg &= ~(INTEL_QEPCON_OP_MODE | INTEL_QEPCON_FLT_EN); + reg |= INTEL_QEPCON_EDGE_A | INTEL_QEPCON_EDGE_B | + INTEL_QEPCON_EDGE_INDX | INTEL_QEPCON_COUNT_RST_MODE; + intel_qep_writel(qep, INTEL_QEPCON, reg); + intel_qep_writel(qep, INTEL_QEPINT_MASK, INTEL_QEPINT_MASK_ALL); +} + +static int intel_qep_count_read(struct counter_device *counter, + struct counter_count *count, u64 *val) +{ + struct intel_qep *const qep = counter_priv(counter); + + pm_runtime_get_sync(qep->dev); + *val = intel_qep_readl(qep, INTEL_QEPCOUNT); + pm_runtime_put(qep->dev); + + return 0; +} + +static const enum counter_function intel_qep_count_functions[] = { + COUNTER_FUNCTION_QUADRATURE_X4, +}; + +static int intel_qep_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) +{ + *function = COUNTER_FUNCTION_QUADRATURE_X4; + + return 0; +} + +static const enum counter_synapse_action intel_qep_synapse_actions[] = { + COUNTER_SYNAPSE_ACTION_BOTH_EDGES, +}; + +static int intel_qep_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) +{ + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + return 0; +} + +static const struct counter_ops intel_qep_counter_ops = { + .count_read = intel_qep_count_read, + .function_read = intel_qep_function_read, + .action_read = intel_qep_action_read, +}; + +#define INTEL_QEP_SIGNAL(_id, _name) { \ + .id = (_id), \ + .name = (_name), \ +} + +static struct counter_signal intel_qep_signals[] = { + INTEL_QEP_SIGNAL(0, "Phase A"), + INTEL_QEP_SIGNAL(1, "Phase B"), + INTEL_QEP_SIGNAL(2, "Index"), +}; + +#define INTEL_QEP_SYNAPSE(_signal_id) { \ + .actions_list = intel_qep_synapse_actions, \ + .num_actions = ARRAY_SIZE(intel_qep_synapse_actions), \ + .signal = &intel_qep_signals[(_signal_id)], \ +} + +static struct counter_synapse intel_qep_count_synapses[] = { + INTEL_QEP_SYNAPSE(0), + INTEL_QEP_SYNAPSE(1), + INTEL_QEP_SYNAPSE(2), +}; + +static int intel_qep_ceiling_read(struct counter_device *counter, + struct counter_count *count, u64 *ceiling) +{ + struct intel_qep *qep = counter_priv(counter); + + pm_runtime_get_sync(qep->dev); + *ceiling = intel_qep_readl(qep, INTEL_QEPMAX); + pm_runtime_put(qep->dev); + + return 0; +} + +static int intel_qep_ceiling_write(struct counter_device *counter, + struct counter_count *count, u64 max) +{ + struct intel_qep *qep = counter_priv(counter); + int ret = 0; + + /* Intel QEP ceiling configuration only supports 32-bit values */ + if (max != (u32)max) + return -ERANGE; + + mutex_lock(&qep->lock); + if (qep->enabled) { + ret = -EBUSY; + goto out; + } + + pm_runtime_get_sync(qep->dev); + intel_qep_writel(qep, INTEL_QEPMAX, max); + pm_runtime_put(qep->dev); + +out: + mutex_unlock(&qep->lock); + return ret; +} + +static int intel_qep_enable_read(struct counter_device *counter, + struct counter_count *count, u8 *enable) +{ + struct intel_qep *qep = counter_priv(counter); + + *enable = qep->enabled; + + return 0; +} + +static int intel_qep_enable_write(struct counter_device *counter, + struct counter_count *count, u8 val) +{ + struct intel_qep *qep = counter_priv(counter); + u32 reg; + bool changed; + + mutex_lock(&qep->lock); + changed = val ^ qep->enabled; + if (!changed) + goto out; + + pm_runtime_get_sync(qep->dev); + reg = intel_qep_readl(qep, INTEL_QEPCON); + if (val) { + /* Enable peripheral and keep runtime PM always on */ + reg |= INTEL_QEPCON_EN; + pm_runtime_get_noresume(qep->dev); + } else { + /* Let runtime PM be idle and disable peripheral */ + pm_runtime_put_noidle(qep->dev); + reg &= ~INTEL_QEPCON_EN; + } + intel_qep_writel(qep, INTEL_QEPCON, reg); + pm_runtime_put(qep->dev); + qep->enabled = val; + +out: + mutex_unlock(&qep->lock); + return 0; +} + +static int intel_qep_spike_filter_ns_read(struct counter_device *counter, + struct counter_count *count, + u64 *length) +{ + struct intel_qep *qep = counter_priv(counter); + u32 reg; + + pm_runtime_get_sync(qep->dev); + reg = intel_qep_readl(qep, INTEL_QEPCON); + if (!(reg & INTEL_QEPCON_FLT_EN)) { + pm_runtime_put(qep->dev); + return 0; + } + reg = INTEL_QEPFLT_MAX_COUNT(intel_qep_readl(qep, INTEL_QEPFLT)); + pm_runtime_put(qep->dev); + + *length = (reg + 2) * INTEL_QEP_CLK_PERIOD_NS; + + return 0; +} + +static int intel_qep_spike_filter_ns_write(struct counter_device *counter, + struct counter_count *count, + u64 length) +{ + struct intel_qep *qep = counter_priv(counter); + u32 reg; + bool enable; + int ret = 0; + + /* + * Spike filter length is (MAX_COUNT + 2) clock periods. + * Disable filter when userspace writes 0, enable for valid + * nanoseconds values and error out otherwise. + */ + do_div(length, INTEL_QEP_CLK_PERIOD_NS); + if (length == 0) { + enable = false; + length = 0; + } else if (length >= 2) { + enable = true; + length -= 2; + } else { + return -EINVAL; + } + + if (length > INTEL_QEPFLT_MAX_COUNT(length)) + return -ERANGE; + + mutex_lock(&qep->lock); + if (qep->enabled) { + ret = -EBUSY; + goto out; + } + + pm_runtime_get_sync(qep->dev); + reg = intel_qep_readl(qep, INTEL_QEPCON); + if (enable) + reg |= INTEL_QEPCON_FLT_EN; + else + reg &= ~INTEL_QEPCON_FLT_EN; + intel_qep_writel(qep, INTEL_QEPFLT, length); + intel_qep_writel(qep, INTEL_QEPCON, reg); + pm_runtime_put(qep->dev); + +out: + mutex_unlock(&qep->lock); + return ret; +} + +static int intel_qep_preset_enable_read(struct counter_device *counter, + struct counter_count *count, + u8 *preset_enable) +{ + struct intel_qep *qep = counter_priv(counter); + u32 reg; + + pm_runtime_get_sync(qep->dev); + reg = intel_qep_readl(qep, INTEL_QEPCON); + pm_runtime_put(qep->dev); + + *preset_enable = !(reg & INTEL_QEPCON_COUNT_RST_MODE); + + return 0; +} + +static int intel_qep_preset_enable_write(struct counter_device *counter, + struct counter_count *count, u8 val) +{ + struct intel_qep *qep = counter_priv(counter); + u32 reg; + int ret = 0; + + mutex_lock(&qep->lock); + if (qep->enabled) { + ret = -EBUSY; + goto out; + } + + pm_runtime_get_sync(qep->dev); + reg = intel_qep_readl(qep, INTEL_QEPCON); + if (val) + reg &= ~INTEL_QEPCON_COUNT_RST_MODE; + else + reg |= INTEL_QEPCON_COUNT_RST_MODE; + + intel_qep_writel(qep, INTEL_QEPCON, reg); + pm_runtime_put(qep->dev); + +out: + mutex_unlock(&qep->lock); + + return ret; +} + +static struct counter_comp intel_qep_count_ext[] = { + COUNTER_COMP_ENABLE(intel_qep_enable_read, intel_qep_enable_write), + COUNTER_COMP_CEILING(intel_qep_ceiling_read, intel_qep_ceiling_write), + COUNTER_COMP_PRESET_ENABLE(intel_qep_preset_enable_read, + intel_qep_preset_enable_write), + COUNTER_COMP_COUNT_U64("spike_filter_ns", + intel_qep_spike_filter_ns_read, + intel_qep_spike_filter_ns_write), +}; + +static struct counter_count intel_qep_counter_count[] = { + { + .id = 0, + .name = "Channel 1 Count", + .functions_list = intel_qep_count_functions, + .num_functions = ARRAY_SIZE(intel_qep_count_functions), + .synapses = intel_qep_count_synapses, + .num_synapses = ARRAY_SIZE(intel_qep_count_synapses), + .ext = intel_qep_count_ext, + .num_ext = ARRAY_SIZE(intel_qep_count_ext), + }, +}; + +static int intel_qep_probe(struct pci_dev *pci, const struct pci_device_id *id) +{ + struct counter_device *counter; + struct intel_qep *qep; + struct device *dev = &pci->dev; + void __iomem *regs; + int ret; + + counter = devm_counter_alloc(dev, sizeof(*qep)); + if (!counter) + return -ENOMEM; + qep = counter_priv(counter); + + ret = pcim_enable_device(pci); + if (ret) + return ret; + + pci_set_master(pci); + + ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci)); + if (ret) + return ret; + + regs = pcim_iomap_table(pci)[0]; + if (!regs) + return -ENOMEM; + + qep->dev = dev; + qep->regs = regs; + mutex_init(&qep->lock); + + intel_qep_init(qep); + pci_set_drvdata(pci, qep); + + counter->name = pci_name(pci); + counter->parent = dev; + counter->ops = &intel_qep_counter_ops; + counter->counts = intel_qep_counter_count; + counter->num_counts = ARRAY_SIZE(intel_qep_counter_count); + counter->signals = intel_qep_signals; + counter->num_signals = ARRAY_SIZE(intel_qep_signals); + qep->enabled = false; + + pm_runtime_put(dev); + pm_runtime_allow(dev); + + ret = devm_counter_add(&pci->dev, counter); + if (ret < 0) + return dev_err_probe(&pci->dev, ret, "Failed to add counter\n"); + + return 0; +} + +static void intel_qep_remove(struct pci_dev *pci) +{ + struct intel_qep *qep = pci_get_drvdata(pci); + struct device *dev = &pci->dev; + + pm_runtime_forbid(dev); + if (!qep->enabled) + pm_runtime_get(dev); + + intel_qep_writel(qep, INTEL_QEPCON, 0); +} + +static int __maybe_unused intel_qep_suspend(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct intel_qep *qep = pci_get_drvdata(pdev); + + qep->qepcon = intel_qep_readl(qep, INTEL_QEPCON); + qep->qepflt = intel_qep_readl(qep, INTEL_QEPFLT); + qep->qepmax = intel_qep_readl(qep, INTEL_QEPMAX); + + return 0; +} + +static int __maybe_unused intel_qep_resume(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct intel_qep *qep = pci_get_drvdata(pdev); + + /* + * Make sure peripheral is disabled when restoring registers and + * control register bits that are writable only when the peripheral + * is disabled + */ + intel_qep_writel(qep, INTEL_QEPCON, 0); + intel_qep_readl(qep, INTEL_QEPCON); + + intel_qep_writel(qep, INTEL_QEPFLT, qep->qepflt); + intel_qep_writel(qep, INTEL_QEPMAX, qep->qepmax); + intel_qep_writel(qep, INTEL_QEPINT_MASK, INTEL_QEPINT_MASK_ALL); + + /* Restore all other control register bits except enable status */ + intel_qep_writel(qep, INTEL_QEPCON, qep->qepcon & ~INTEL_QEPCON_EN); + intel_qep_readl(qep, INTEL_QEPCON); + + /* Restore enable status */ + intel_qep_writel(qep, INTEL_QEPCON, qep->qepcon); + + return 0; +} + +static UNIVERSAL_DEV_PM_OPS(intel_qep_pm_ops, + intel_qep_suspend, intel_qep_resume, NULL); + +static const struct pci_device_id intel_qep_id_table[] = { + /* EHL */ + { PCI_VDEVICE(INTEL, 0x4bc3), }, + { PCI_VDEVICE(INTEL, 0x4b81), }, + { PCI_VDEVICE(INTEL, 0x4b82), }, + { PCI_VDEVICE(INTEL, 0x4b83), }, + { } /* Terminating Entry */ +}; +MODULE_DEVICE_TABLE(pci, intel_qep_id_table); + +static struct pci_driver intel_qep_driver = { + .name = "intel-qep", + .id_table = intel_qep_id_table, + .probe = intel_qep_probe, + .remove = intel_qep_remove, + .driver = { + .pm = &intel_qep_pm_ops, + } +}; + +module_pci_driver(intel_qep_driver); + +MODULE_AUTHOR("Felipe Balbi (Intel)"); +MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>"); +MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Intel Quadrature Encoder Peripheral driver"); +MODULE_IMPORT_NS(COUNTER); diff --git a/drivers/counter/interrupt-cnt.c b/drivers/counter/interrupt-cnt.c new file mode 100644 index 000000000000..229473855c5b --- /dev/null +++ b/drivers/counter/interrupt-cnt.c @@ -0,0 +1,256 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2021 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> + */ + +#include <linux/counter.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/types.h> + +#define INTERRUPT_CNT_NAME "interrupt-cnt" + +struct interrupt_cnt_priv { + atomic_t count; + struct gpio_desc *gpio; + int irq; + bool enabled; + struct counter_signal signals; + struct counter_synapse synapses; + struct counter_count cnts; +}; + +static irqreturn_t interrupt_cnt_isr(int irq, void *dev_id) +{ + struct counter_device *counter = dev_id; + struct interrupt_cnt_priv *priv = counter_priv(counter); + + atomic_inc(&priv->count); + + counter_push_event(counter, COUNTER_EVENT_CHANGE_OF_STATE, 0); + + return IRQ_HANDLED; +} + +static int interrupt_cnt_enable_read(struct counter_device *counter, + struct counter_count *count, u8 *enable) +{ + struct interrupt_cnt_priv *priv = counter_priv(counter); + + *enable = priv->enabled; + + return 0; +} + +static int interrupt_cnt_enable_write(struct counter_device *counter, + struct counter_count *count, u8 enable) +{ + struct interrupt_cnt_priv *priv = counter_priv(counter); + + if (priv->enabled == enable) + return 0; + + if (enable) { + priv->enabled = true; + enable_irq(priv->irq); + } else { + disable_irq(priv->irq); + priv->enabled = false; + } + + return 0; +} + +static struct counter_comp interrupt_cnt_ext[] = { + COUNTER_COMP_ENABLE(interrupt_cnt_enable_read, + interrupt_cnt_enable_write), +}; + +static const enum counter_synapse_action interrupt_cnt_synapse_actions[] = { + COUNTER_SYNAPSE_ACTION_RISING_EDGE, +}; + +static int interrupt_cnt_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) +{ + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; + + return 0; +} + +static int interrupt_cnt_read(struct counter_device *counter, + struct counter_count *count, u64 *val) +{ + struct interrupt_cnt_priv *priv = counter_priv(counter); + + *val = atomic_read(&priv->count); + + return 0; +} + +static int interrupt_cnt_write(struct counter_device *counter, + struct counter_count *count, const u64 val) +{ + struct interrupt_cnt_priv *priv = counter_priv(counter); + + if (val != (typeof(priv->count.counter))val) + return -ERANGE; + + atomic_set(&priv->count, val); + + return 0; +} + +static const enum counter_function interrupt_cnt_functions[] = { + COUNTER_FUNCTION_INCREASE, +}; + +static int interrupt_cnt_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) +{ + *function = COUNTER_FUNCTION_INCREASE; + + return 0; +} + +static int interrupt_cnt_signal_read(struct counter_device *counter, + struct counter_signal *signal, + enum counter_signal_level *level) +{ + struct interrupt_cnt_priv *priv = counter_priv(counter); + int ret; + + if (!priv->gpio) + return -EINVAL; + + ret = gpiod_get_value(priv->gpio); + if (ret < 0) + return ret; + + *level = ret ? COUNTER_SIGNAL_LEVEL_HIGH : COUNTER_SIGNAL_LEVEL_LOW; + + return 0; +} + +static int interrupt_cnt_watch_validate(struct counter_device *counter, + const struct counter_watch *watch) +{ + if (watch->channel != 0 || + watch->event != COUNTER_EVENT_CHANGE_OF_STATE) + return -EINVAL; + + return 0; +} + +static const struct counter_ops interrupt_cnt_ops = { + .action_read = interrupt_cnt_action_read, + .count_read = interrupt_cnt_read, + .count_write = interrupt_cnt_write, + .function_read = interrupt_cnt_function_read, + .signal_read = interrupt_cnt_signal_read, + .watch_validate = interrupt_cnt_watch_validate, +}; + +static int interrupt_cnt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct counter_device *counter; + struct interrupt_cnt_priv *priv; + int ret; + + counter = devm_counter_alloc(dev, sizeof(*priv)); + if (!counter) + return -ENOMEM; + priv = counter_priv(counter); + + priv->irq = platform_get_irq_optional(pdev, 0); + if (priv->irq == -ENXIO) + priv->irq = 0; + else if (priv->irq < 0) + return dev_err_probe(dev, priv->irq, "failed to get IRQ\n"); + + priv->gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_IN); + if (IS_ERR(priv->gpio)) + return dev_err_probe(dev, PTR_ERR(priv->gpio), "failed to get GPIO\n"); + + if (!priv->irq && !priv->gpio) { + dev_err(dev, "IRQ and GPIO are not found. At least one source should be provided\n"); + return -ENODEV; + } + + if (!priv->irq) { + int irq = gpiod_to_irq(priv->gpio); + + if (irq < 0) + return dev_err_probe(dev, irq, "failed to get IRQ from GPIO\n"); + + priv->irq = irq; + } + + priv->signals.name = devm_kasprintf(dev, GFP_KERNEL, "IRQ %d", + priv->irq); + if (!priv->signals.name) + return -ENOMEM; + + counter->signals = &priv->signals; + counter->num_signals = 1; + + priv->synapses.actions_list = interrupt_cnt_synapse_actions; + priv->synapses.num_actions = ARRAY_SIZE(interrupt_cnt_synapse_actions); + priv->synapses.signal = &priv->signals; + + priv->cnts.name = "Channel 0 Count"; + priv->cnts.functions_list = interrupt_cnt_functions; + priv->cnts.num_functions = ARRAY_SIZE(interrupt_cnt_functions); + priv->cnts.synapses = &priv->synapses; + priv->cnts.num_synapses = 1; + priv->cnts.ext = interrupt_cnt_ext; + priv->cnts.num_ext = ARRAY_SIZE(interrupt_cnt_ext); + + counter->name = dev_name(dev); + counter->parent = dev; + counter->ops = &interrupt_cnt_ops; + counter->counts = &priv->cnts; + counter->num_counts = 1; + + irq_set_status_flags(priv->irq, IRQ_NOAUTOEN); + ret = devm_request_irq(dev, priv->irq, interrupt_cnt_isr, + IRQF_TRIGGER_RISING | IRQF_NO_THREAD, + dev_name(dev), counter); + if (ret) + return ret; + + ret = devm_counter_add(dev, counter); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to add counter\n"); + + return 0; +} + +static const struct of_device_id interrupt_cnt_of_match[] = { + { .compatible = "interrupt-counter", }, + {} +}; +MODULE_DEVICE_TABLE(of, interrupt_cnt_of_match); + +static struct platform_driver interrupt_cnt_driver = { + .probe = interrupt_cnt_probe, + .driver = { + .name = INTERRUPT_CNT_NAME, + .of_match_table = interrupt_cnt_of_match, + }, +}; +module_platform_driver(interrupt_cnt_driver); + +MODULE_ALIAS("platform:interrupt-counter"); +MODULE_AUTHOR("Oleksij Rempel <o.rempel@pengutronix.de>"); +MODULE_DESCRIPTION("Interrupt counter driver"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(COUNTER); diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c new file mode 100644 index 000000000000..e2d1dc6ca668 --- /dev/null +++ b/drivers/counter/microchip-tcb-capture.c @@ -0,0 +1,407 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020 Microchip + * + * Author: Kamel Bouhara <kamel.bouhara@bootlin.com> + */ +#include <linux/clk.h> +#include <linux/counter.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <soc/at91/atmel_tcb.h> + +#define ATMEL_TC_CMR_MASK (ATMEL_TC_LDRA_RISING | ATMEL_TC_LDRB_FALLING | \ + ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_LDBDIS | \ + ATMEL_TC_LDBSTOP) + +#define ATMEL_TC_QDEN BIT(8) +#define ATMEL_TC_POSEN BIT(9) + +struct mchp_tc_data { + const struct atmel_tcb_config *tc_cfg; + struct regmap *regmap; + int qdec_mode; + int num_channels; + int channel[2]; +}; + +static const enum counter_function mchp_tc_count_functions[] = { + COUNTER_FUNCTION_INCREASE, + COUNTER_FUNCTION_QUADRATURE_X4, +}; + +static const enum counter_synapse_action mchp_tc_synapse_actions[] = { + COUNTER_SYNAPSE_ACTION_NONE, + COUNTER_SYNAPSE_ACTION_RISING_EDGE, + COUNTER_SYNAPSE_ACTION_FALLING_EDGE, + COUNTER_SYNAPSE_ACTION_BOTH_EDGES, +}; + +static struct counter_signal mchp_tc_count_signals[] = { + { + .id = 0, + .name = "Channel A", + }, + { + .id = 1, + .name = "Channel B", + } +}; + +static struct counter_synapse mchp_tc_count_synapses[] = { + { + .actions_list = mchp_tc_synapse_actions, + .num_actions = ARRAY_SIZE(mchp_tc_synapse_actions), + .signal = &mchp_tc_count_signals[0] + }, + { + .actions_list = mchp_tc_synapse_actions, + .num_actions = ARRAY_SIZE(mchp_tc_synapse_actions), + .signal = &mchp_tc_count_signals[1] + } +}; + +static int mchp_tc_count_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + + if (priv->qdec_mode) + *function = COUNTER_FUNCTION_QUADRATURE_X4; + else + *function = COUNTER_FUNCTION_INCREASE; + + return 0; +} + +static int mchp_tc_count_function_write(struct counter_device *counter, + struct counter_count *count, + enum counter_function function) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + u32 bmr, cmr; + + regmap_read(priv->regmap, ATMEL_TC_BMR, &bmr); + regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr); + + /* Set capture mode */ + cmr &= ~ATMEL_TC_WAVE; + + switch (function) { + case COUNTER_FUNCTION_INCREASE: + priv->qdec_mode = 0; + /* Set highest rate based on whether soc has gclk or not */ + bmr &= ~(ATMEL_TC_QDEN | ATMEL_TC_POSEN); + if (priv->tc_cfg->has_gclk) + cmr |= ATMEL_TC_TIMER_CLOCK2; + else + cmr |= ATMEL_TC_TIMER_CLOCK1; + /* Setup the period capture mode */ + cmr |= ATMEL_TC_CMR_MASK; + cmr &= ~(ATMEL_TC_ABETRG | ATMEL_TC_XC0); + break; + case COUNTER_FUNCTION_QUADRATURE_X4: + if (!priv->tc_cfg->has_qdec) + return -EINVAL; + /* In QDEC mode settings both channels 0 and 1 are required */ + if (priv->num_channels < 2 || priv->channel[0] != 0 || + priv->channel[1] != 1) { + pr_err("Invalid channels number or id for quadrature mode\n"); + return -EINVAL; + } + priv->qdec_mode = 1; + bmr |= ATMEL_TC_QDEN | ATMEL_TC_POSEN; + cmr |= ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_ABETRG | ATMEL_TC_XC0; + break; + default: + /* should never reach this path */ + return -EINVAL; + } + + regmap_write(priv->regmap, ATMEL_TC_BMR, bmr); + regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), cmr); + + /* Enable clock and trigger counter */ + regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], CCR), + ATMEL_TC_CLKEN | ATMEL_TC_SWTRG); + + if (priv->qdec_mode) { + regmap_write(priv->regmap, + ATMEL_TC_REG(priv->channel[1], CMR), cmr); + regmap_write(priv->regmap, + ATMEL_TC_REG(priv->channel[1], CCR), + ATMEL_TC_CLKEN | ATMEL_TC_SWTRG); + } + + return 0; +} + +static int mchp_tc_count_signal_read(struct counter_device *counter, + struct counter_signal *signal, + enum counter_signal_level *lvl) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + bool sigstatus; + u32 sr; + + regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], SR), &sr); + + if (signal->id == 1) + sigstatus = (sr & ATMEL_TC_MTIOB); + else + sigstatus = (sr & ATMEL_TC_MTIOA); + + *lvl = sigstatus ? COUNTER_SIGNAL_LEVEL_HIGH : COUNTER_SIGNAL_LEVEL_LOW; + + return 0; +} + +static int mchp_tc_count_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + u32 cmr; + + if (priv->qdec_mode) { + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + return 0; + } + + /* Only TIOA signal is evaluated in non-QDEC mode */ + if (synapse->signal->id != 0) { + *action = COUNTER_SYNAPSE_ACTION_NONE; + return 0; + } + + regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr); + + switch (cmr & ATMEL_TC_ETRGEDG) { + default: + *action = COUNTER_SYNAPSE_ACTION_NONE; + break; + case ATMEL_TC_ETRGEDG_RISING: + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; + break; + case ATMEL_TC_ETRGEDG_FALLING: + *action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE; + break; + case ATMEL_TC_ETRGEDG_BOTH: + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + break; + } + + return 0; +} + +static int mchp_tc_count_action_write(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action action) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + u32 edge = ATMEL_TC_ETRGEDG_NONE; + + /* QDEC mode is rising edge only; only TIOA handled in non-QDEC mode */ + if (priv->qdec_mode || synapse->signal->id != 0) + return -EINVAL; + + switch (action) { + case COUNTER_SYNAPSE_ACTION_NONE: + edge = ATMEL_TC_ETRGEDG_NONE; + break; + case COUNTER_SYNAPSE_ACTION_RISING_EDGE: + edge = ATMEL_TC_ETRGEDG_RISING; + break; + case COUNTER_SYNAPSE_ACTION_FALLING_EDGE: + edge = ATMEL_TC_ETRGEDG_FALLING; + break; + case COUNTER_SYNAPSE_ACTION_BOTH_EDGES: + edge = ATMEL_TC_ETRGEDG_BOTH; + break; + default: + /* should never reach this path */ + return -EINVAL; + } + + return regmap_write_bits(priv->regmap, + ATMEL_TC_REG(priv->channel[0], CMR), + ATMEL_TC_ETRGEDG, edge); +} + +static int mchp_tc_count_read(struct counter_device *counter, + struct counter_count *count, u64 *val) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + u32 cnt; + + regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CV), &cnt); + *val = cnt; + + return 0; +} + +static struct counter_count mchp_tc_counts[] = { + { + .id = 0, + .name = "Timer Counter", + .functions_list = mchp_tc_count_functions, + .num_functions = ARRAY_SIZE(mchp_tc_count_functions), + .synapses = mchp_tc_count_synapses, + .num_synapses = ARRAY_SIZE(mchp_tc_count_synapses), + }, +}; + +static const struct counter_ops mchp_tc_ops = { + .signal_read = mchp_tc_count_signal_read, + .count_read = mchp_tc_count_read, + .function_read = mchp_tc_count_function_read, + .function_write = mchp_tc_count_function_write, + .action_read = mchp_tc_count_action_read, + .action_write = mchp_tc_count_action_write +}; + +static const struct atmel_tcb_config tcb_rm9200_config = { + .counter_width = 16, +}; + +static const struct atmel_tcb_config tcb_sam9x5_config = { + .counter_width = 32, +}; + +static const struct atmel_tcb_config tcb_sama5d2_config = { + .counter_width = 32, + .has_gclk = true, + .has_qdec = true, +}; + +static const struct atmel_tcb_config tcb_sama5d3_config = { + .counter_width = 32, + .has_qdec = true, +}; + +static const struct of_device_id atmel_tc_of_match[] = { + { .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, }, + { .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, }, + { .compatible = "atmel,sama5d2-tcb", .data = &tcb_sama5d2_config, }, + { .compatible = "atmel,sama5d3-tcb", .data = &tcb_sama5d3_config, }, + { /* sentinel */ } +}; + +static void mchp_tc_clk_remove(void *ptr) +{ + clk_disable_unprepare((struct clk *)ptr); +} + +static int mchp_tc_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct atmel_tcb_config *tcb_config; + const struct of_device_id *match; + struct counter_device *counter; + struct mchp_tc_data *priv; + char clk_name[7]; + struct regmap *regmap; + struct clk *clk[3]; + int channel; + int ret, i; + + counter = devm_counter_alloc(&pdev->dev, sizeof(*priv)); + if (!counter) + return -ENOMEM; + priv = counter_priv(counter); + + match = of_match_node(atmel_tc_of_match, np->parent); + tcb_config = match->data; + if (!tcb_config) { + dev_err(&pdev->dev, "No matching parent node found\n"); + return -ENODEV; + } + + regmap = syscon_node_to_regmap(np->parent); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + /* max. channels number is 2 when in QDEC mode */ + priv->num_channels = of_property_count_u32_elems(np, "reg"); + if (priv->num_channels < 0) { + dev_err(&pdev->dev, "Invalid or missing channel\n"); + return -EINVAL; + } + + /* Register channels and initialize clocks */ + for (i = 0; i < priv->num_channels; i++) { + ret = of_property_read_u32_index(np, "reg", i, &channel); + if (ret < 0 || channel > 2) + return -ENODEV; + + priv->channel[i] = channel; + + snprintf(clk_name, sizeof(clk_name), "t%d_clk", channel); + + clk[i] = of_clk_get_by_name(np->parent, clk_name); + if (IS_ERR(clk[i])) { + /* Fallback to t0_clk */ + clk[i] = of_clk_get_by_name(np->parent, "t0_clk"); + if (IS_ERR(clk[i])) + return PTR_ERR(clk[i]); + } + + ret = clk_prepare_enable(clk[i]); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&pdev->dev, + mchp_tc_clk_remove, + clk[i]); + if (ret) + return ret; + + dev_dbg(&pdev->dev, + "Initialized capture mode on channel %d\n", + channel); + } + + priv->tc_cfg = tcb_config; + priv->regmap = regmap; + counter->name = dev_name(&pdev->dev); + counter->parent = &pdev->dev; + counter->ops = &mchp_tc_ops; + counter->num_counts = ARRAY_SIZE(mchp_tc_counts); + counter->counts = mchp_tc_counts; + counter->num_signals = ARRAY_SIZE(mchp_tc_count_signals); + counter->signals = mchp_tc_count_signals; + + ret = devm_counter_add(&pdev->dev, counter); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "Failed to add counter\n"); + + return 0; +} + +static const struct of_device_id mchp_tc_dt_ids[] = { + { .compatible = "microchip,tcb-capture", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, mchp_tc_dt_ids); + +static struct platform_driver mchp_tc_driver = { + .probe = mchp_tc_probe, + .driver = { + .name = "microchip-tcb-capture", + .of_match_table = mchp_tc_dt_ids, + }, +}; +module_platform_driver(mchp_tc_driver); + +MODULE_AUTHOR("Kamel Bouhara <kamel.bouhara@bootlin.com>"); +MODULE_DESCRIPTION("Microchip TCB Capture driver"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(COUNTER); diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c index 8e276eb655f5..d6b80b6dfc28 100644 --- a/drivers/counter/stm32-lptimer-cnt.c +++ b/drivers/counter/stm32-lptimer-cnt.c @@ -12,14 +12,14 @@ #include <linux/bitfield.h> #include <linux/counter.h> -#include <linux/iio/iio.h> #include <linux/mfd/stm32-lptimer.h> +#include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> +#include <linux/types.h> struct stm32_lptim_cnt { - struct counter_device counter; struct device *dev; struct regmap *regmap; struct clk *clk; @@ -107,279 +107,40 @@ static int stm32_lptim_setup(struct stm32_lptim_cnt *priv, int enable) return regmap_update_bits(priv->regmap, STM32_LPTIM_CFGR, mask, val); } -static int stm32_lptim_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, int val2, long mask) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - int ret; - - switch (mask) { - case IIO_CHAN_INFO_ENABLE: - if (val < 0 || val > 1) - return -EINVAL; - - /* Check nobody uses the timer, or already disabled/enabled */ - ret = stm32_lptim_is_enabled(priv); - if ((ret < 0) || (!ret && !val)) - return ret; - if (val && ret) - return -EBUSY; - - ret = stm32_lptim_setup(priv, val); - if (ret) - return ret; - return stm32_lptim_set_enable_state(priv, val); - - default: - return -EINVAL; - } -} - -static int stm32_lptim_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, int *val2, long mask) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - u32 dat; - int ret; - - switch (mask) { - case IIO_CHAN_INFO_RAW: - ret = regmap_read(priv->regmap, STM32_LPTIM_CNT, &dat); - if (ret) - return ret; - *val = dat; - return IIO_VAL_INT; - - case IIO_CHAN_INFO_ENABLE: - ret = stm32_lptim_is_enabled(priv); - if (ret < 0) - return ret; - *val = ret; - return IIO_VAL_INT; - - case IIO_CHAN_INFO_SCALE: - /* Non-quadrature mode: scale = 1 */ - *val = 1; - *val2 = 0; - if (priv->quadrature_mode) { - /* - * Quadrature encoder mode: - * - both edges, quarter cycle, scale is 0.25 - * - either rising/falling edge scale is 0.5 - */ - if (priv->polarity > 1) - *val2 = 2; - else - *val2 = 1; - } - return IIO_VAL_FRACTIONAL_LOG2; - - default: - return -EINVAL; - } -} - -static const struct iio_info stm32_lptim_cnt_iio_info = { - .read_raw = stm32_lptim_read_raw, - .write_raw = stm32_lptim_write_raw, -}; - -static const char *const stm32_lptim_quadrature_modes[] = { - "non-quadrature", - "quadrature", -}; - -static int stm32_lptim_get_quadrature_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - return priv->quadrature_mode; -} - -static int stm32_lptim_set_quadrature_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - unsigned int type) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - if (stm32_lptim_is_enabled(priv)) - return -EBUSY; - - priv->quadrature_mode = type; - - return 0; -} - -static const struct iio_enum stm32_lptim_quadrature_mode_en = { - .items = stm32_lptim_quadrature_modes, - .num_items = ARRAY_SIZE(stm32_lptim_quadrature_modes), - .get = stm32_lptim_get_quadrature_mode, - .set = stm32_lptim_set_quadrature_mode, -}; - -static const char * const stm32_lptim_cnt_polarity[] = { - "rising-edge", "falling-edge", "both-edges", -}; - -static int stm32_lptim_cnt_get_polarity(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - return priv->polarity; -} - -static int stm32_lptim_cnt_set_polarity(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - unsigned int type) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - if (stm32_lptim_is_enabled(priv)) - return -EBUSY; - - priv->polarity = type; - - return 0; -} - -static const struct iio_enum stm32_lptim_cnt_polarity_en = { - .items = stm32_lptim_cnt_polarity, - .num_items = ARRAY_SIZE(stm32_lptim_cnt_polarity), - .get = stm32_lptim_cnt_get_polarity, - .set = stm32_lptim_cnt_set_polarity, -}; - -static ssize_t stm32_lptim_cnt_get_ceiling(struct stm32_lptim_cnt *priv, - char *buf) -{ - return snprintf(buf, PAGE_SIZE, "%u\n", priv->ceiling); -} - -static ssize_t stm32_lptim_cnt_set_ceiling(struct stm32_lptim_cnt *priv, - const char *buf, size_t len) -{ - int ret; - - if (stm32_lptim_is_enabled(priv)) - return -EBUSY; - - ret = kstrtouint(buf, 0, &priv->ceiling); - if (ret) - return ret; - - if (priv->ceiling > STM32_LPTIM_MAX_ARR) - return -EINVAL; - - return len; -} - -static ssize_t stm32_lptim_cnt_get_preset_iio(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - char *buf) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - return stm32_lptim_cnt_get_ceiling(priv, buf); -} - -static ssize_t stm32_lptim_cnt_set_preset_iio(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - const char *buf, size_t len) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - return stm32_lptim_cnt_set_ceiling(priv, buf, len); -} - -/* LP timer with encoder */ -static const struct iio_chan_spec_ext_info stm32_lptim_enc_ext_info[] = { - { - .name = "preset", - .shared = IIO_SEPARATE, - .read = stm32_lptim_cnt_get_preset_iio, - .write = stm32_lptim_cnt_set_preset_iio, - }, - IIO_ENUM("polarity", IIO_SEPARATE, &stm32_lptim_cnt_polarity_en), - IIO_ENUM_AVAILABLE("polarity", &stm32_lptim_cnt_polarity_en), - IIO_ENUM("quadrature_mode", IIO_SEPARATE, - &stm32_lptim_quadrature_mode_en), - IIO_ENUM_AVAILABLE("quadrature_mode", &stm32_lptim_quadrature_mode_en), - {} -}; - -static const struct iio_chan_spec stm32_lptim_enc_channels = { - .type = IIO_COUNT, - .channel = 0, - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | - BIT(IIO_CHAN_INFO_ENABLE) | - BIT(IIO_CHAN_INFO_SCALE), - .ext_info = stm32_lptim_enc_ext_info, - .indexed = 1, -}; - -/* LP timer without encoder (counter only) */ -static const struct iio_chan_spec_ext_info stm32_lptim_cnt_ext_info[] = { - { - .name = "preset", - .shared = IIO_SEPARATE, - .read = stm32_lptim_cnt_get_preset_iio, - .write = stm32_lptim_cnt_set_preset_iio, - }, - IIO_ENUM("polarity", IIO_SEPARATE, &stm32_lptim_cnt_polarity_en), - IIO_ENUM_AVAILABLE("polarity", &stm32_lptim_cnt_polarity_en), - {} -}; - -static const struct iio_chan_spec stm32_lptim_cnt_channels = { - .type = IIO_COUNT, - .channel = 0, - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | - BIT(IIO_CHAN_INFO_ENABLE) | - BIT(IIO_CHAN_INFO_SCALE), - .ext_info = stm32_lptim_cnt_ext_info, - .indexed = 1, -}; - -/** - * enum stm32_lptim_cnt_function - enumerates LPTimer counter & encoder modes - * @STM32_LPTIM_COUNTER_INCREASE: up count on IN1 rising, falling or both edges - * @STM32_LPTIM_ENCODER_BOTH_EDGE: count on both edges (IN1 & IN2 quadrature) +/* + * In non-quadrature mode, device counts up on active edge. + * In quadrature mode, encoder counting scenarios are as follows: + * +---------+----------+--------------------+--------------------+ + * | Active | Level on | IN1 signal | IN2 signal | + * | edge | opposite +----------+---------+----------+---------+ + * | | signal | Rising | Falling | Rising | Falling | + * +---------+----------+----------+---------+----------+---------+ + * | Rising | High -> | Down | - | Up | - | + * | edge | Low -> | Up | - | Down | - | + * +---------+----------+----------+---------+----------+---------+ + * | Falling | High -> | - | Up | - | Down | + * | edge | Low -> | - | Down | - | Up | + * +---------+----------+----------+---------+----------+---------+ + * | Both | High -> | Down | Up | Up | Down | + * | edges | Low -> | Up | Down | Down | Up | + * +---------+----------+----------+---------+----------+---------+ */ -enum stm32_lptim_cnt_function { - STM32_LPTIM_COUNTER_INCREASE, - STM32_LPTIM_ENCODER_BOTH_EDGE, +static const enum counter_function stm32_lptim_cnt_functions[] = { + COUNTER_FUNCTION_INCREASE, + COUNTER_FUNCTION_QUADRATURE_X4, }; -static enum counter_count_function stm32_lptim_cnt_functions[] = { - [STM32_LPTIM_COUNTER_INCREASE] = COUNTER_COUNT_FUNCTION_INCREASE, - [STM32_LPTIM_ENCODER_BOTH_EDGE] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4, -}; - -enum stm32_lptim_synapse_action { - STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE, - STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE, - STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES, - STM32_LPTIM_SYNAPSE_ACTION_NONE, -}; - -static enum counter_synapse_action stm32_lptim_cnt_synapse_actions[] = { - /* Index must match with stm32_lptim_cnt_polarity[] (priv->polarity) */ - [STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE, - [STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE, - [STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES, - [STM32_LPTIM_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE, +static const enum counter_synapse_action stm32_lptim_cnt_synapse_actions[] = { + COUNTER_SYNAPSE_ACTION_RISING_EDGE, + COUNTER_SYNAPSE_ACTION_FALLING_EDGE, + COUNTER_SYNAPSE_ACTION_BOTH_EDGES, + COUNTER_SYNAPSE_ACTION_NONE, }; static int stm32_lptim_cnt_read(struct counter_device *counter, - struct counter_count *count, unsigned long *val) + struct counter_count *count, u64 *val) { - struct stm32_lptim_cnt *const priv = counter->priv; + struct stm32_lptim_cnt *const priv = counter_priv(counter); u32 cnt; int ret; @@ -392,74 +153,71 @@ static int stm32_lptim_cnt_read(struct counter_device *counter, return 0; } -static int stm32_lptim_cnt_function_get(struct counter_device *counter, - struct counter_count *count, - size_t *function) +static int stm32_lptim_cnt_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) { - struct stm32_lptim_cnt *const priv = counter->priv; + struct stm32_lptim_cnt *const priv = counter_priv(counter); if (!priv->quadrature_mode) { - *function = STM32_LPTIM_COUNTER_INCREASE; + *function = COUNTER_FUNCTION_INCREASE; return 0; } - if (priv->polarity == STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES) { - *function = STM32_LPTIM_ENCODER_BOTH_EDGE; + if (priv->polarity == STM32_LPTIM_CKPOL_BOTH_EDGES) { + *function = COUNTER_FUNCTION_QUADRATURE_X4; return 0; } return -EINVAL; } -static int stm32_lptim_cnt_function_set(struct counter_device *counter, - struct counter_count *count, - size_t function) +static int stm32_lptim_cnt_function_write(struct counter_device *counter, + struct counter_count *count, + enum counter_function function) { - struct stm32_lptim_cnt *const priv = counter->priv; + struct stm32_lptim_cnt *const priv = counter_priv(counter); if (stm32_lptim_is_enabled(priv)) return -EBUSY; switch (function) { - case STM32_LPTIM_COUNTER_INCREASE: + case COUNTER_FUNCTION_INCREASE: priv->quadrature_mode = 0; return 0; - case STM32_LPTIM_ENCODER_BOTH_EDGE: + case COUNTER_FUNCTION_QUADRATURE_X4: priv->quadrature_mode = 1; - priv->polarity = STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES; + priv->polarity = STM32_LPTIM_CKPOL_BOTH_EDGES; return 0; + default: + /* should never reach this path */ + return -EINVAL; } - - return -EINVAL; } -static ssize_t stm32_lptim_cnt_enable_read(struct counter_device *counter, - struct counter_count *count, - void *private, char *buf) +static int stm32_lptim_cnt_enable_read(struct counter_device *counter, + struct counter_count *count, + u8 *enable) { - struct stm32_lptim_cnt *const priv = counter->priv; + struct stm32_lptim_cnt *const priv = counter_priv(counter); int ret; ret = stm32_lptim_is_enabled(priv); if (ret < 0) return ret; - return scnprintf(buf, PAGE_SIZE, "%u\n", ret); + *enable = ret; + + return 0; } -static ssize_t stm32_lptim_cnt_enable_write(struct counter_device *counter, - struct counter_count *count, - void *private, - const char *buf, size_t len) +static int stm32_lptim_cnt_enable_write(struct counter_device *counter, + struct counter_count *count, + u8 enable) { - struct stm32_lptim_cnt *const priv = counter->priv; - bool enable; + struct stm32_lptim_cnt *const priv = counter_priv(counter); int ret; - ret = kstrtobool(buf, &enable); - if (ret) - return ret; - /* Check nobody uses the timer, or already disabled/enabled */ ret = stm32_lptim_is_enabled(priv); if ((ret < 0) || (!ret && !enable)) @@ -475,107 +233,130 @@ static ssize_t stm32_lptim_cnt_enable_write(struct counter_device *counter, if (ret) return ret; - return len; + return 0; } -static ssize_t stm32_lptim_cnt_ceiling_read(struct counter_device *counter, - struct counter_count *count, - void *private, char *buf) +static int stm32_lptim_cnt_ceiling_read(struct counter_device *counter, + struct counter_count *count, + u64 *ceiling) { - struct stm32_lptim_cnt *const priv = counter->priv; + struct stm32_lptim_cnt *const priv = counter_priv(counter); - return stm32_lptim_cnt_get_ceiling(priv, buf); + *ceiling = priv->ceiling; + + return 0; } -static ssize_t stm32_lptim_cnt_ceiling_write(struct counter_device *counter, - struct counter_count *count, - void *private, - const char *buf, size_t len) +static int stm32_lptim_cnt_ceiling_write(struct counter_device *counter, + struct counter_count *count, + u64 ceiling) { - struct stm32_lptim_cnt *const priv = counter->priv; + struct stm32_lptim_cnt *const priv = counter_priv(counter); - return stm32_lptim_cnt_set_ceiling(priv, buf, len); + if (stm32_lptim_is_enabled(priv)) + return -EBUSY; + + if (ceiling > STM32_LPTIM_MAX_ARR) + return -ERANGE; + + priv->ceiling = ceiling; + + return 0; } -static const struct counter_count_ext stm32_lptim_cnt_ext[] = { - { - .name = "enable", - .read = stm32_lptim_cnt_enable_read, - .write = stm32_lptim_cnt_enable_write - }, - { - .name = "ceiling", - .read = stm32_lptim_cnt_ceiling_read, - .write = stm32_lptim_cnt_ceiling_write - }, +static struct counter_comp stm32_lptim_cnt_ext[] = { + COUNTER_COMP_ENABLE(stm32_lptim_cnt_enable_read, + stm32_lptim_cnt_enable_write), + COUNTER_COMP_CEILING(stm32_lptim_cnt_ceiling_read, + stm32_lptim_cnt_ceiling_write), }; -static int stm32_lptim_cnt_action_get(struct counter_device *counter, - struct counter_count *count, - struct counter_synapse *synapse, - size_t *action) +static int stm32_lptim_cnt_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) { - struct stm32_lptim_cnt *const priv = counter->priv; - size_t function; + struct stm32_lptim_cnt *const priv = counter_priv(counter); + enum counter_function function; int err; - err = stm32_lptim_cnt_function_get(counter, count, &function); + err = stm32_lptim_cnt_function_read(counter, count, &function); if (err) return err; switch (function) { - case STM32_LPTIM_COUNTER_INCREASE: + case COUNTER_FUNCTION_INCREASE: /* LP Timer acts as up-counter on input 1 */ - if (synapse->signal->id == count->synapses[0].signal->id) - *action = priv->polarity; - else - *action = STM32_LPTIM_SYNAPSE_ACTION_NONE; - return 0; - case STM32_LPTIM_ENCODER_BOTH_EDGE: - *action = priv->polarity; + if (synapse->signal->id != count->synapses[0].signal->id) { + *action = COUNTER_SYNAPSE_ACTION_NONE; + return 0; + } + + switch (priv->polarity) { + case STM32_LPTIM_CKPOL_RISING_EDGE: + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; + return 0; + case STM32_LPTIM_CKPOL_FALLING_EDGE: + *action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE; + return 0; + case STM32_LPTIM_CKPOL_BOTH_EDGES: + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + return 0; + default: + /* should never reach this path */ + return -EINVAL; + } + case COUNTER_FUNCTION_QUADRATURE_X4: + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; return 0; + default: + /* should never reach this path */ + return -EINVAL; } - - return -EINVAL; } -static int stm32_lptim_cnt_action_set(struct counter_device *counter, - struct counter_count *count, - struct counter_synapse *synapse, - size_t action) +static int stm32_lptim_cnt_action_write(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action action) { - struct stm32_lptim_cnt *const priv = counter->priv; - size_t function; + struct stm32_lptim_cnt *const priv = counter_priv(counter); + enum counter_function function; int err; if (stm32_lptim_is_enabled(priv)) return -EBUSY; - err = stm32_lptim_cnt_function_get(counter, count, &function); + err = stm32_lptim_cnt_function_read(counter, count, &function); if (err) return err; /* only set polarity when in counter mode (on input 1) */ - if (function == STM32_LPTIM_COUNTER_INCREASE - && synapse->signal->id == count->synapses[0].signal->id) { - switch (action) { - case STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE: - case STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE: - case STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES: - priv->polarity = action; - return 0; - } - } + if (function != COUNTER_FUNCTION_INCREASE + || synapse->signal->id != count->synapses[0].signal->id) + return -EINVAL; - return -EINVAL; + switch (action) { + case COUNTER_SYNAPSE_ACTION_RISING_EDGE: + priv->polarity = STM32_LPTIM_CKPOL_RISING_EDGE; + return 0; + case COUNTER_SYNAPSE_ACTION_FALLING_EDGE: + priv->polarity = STM32_LPTIM_CKPOL_FALLING_EDGE; + return 0; + case COUNTER_SYNAPSE_ACTION_BOTH_EDGES: + priv->polarity = STM32_LPTIM_CKPOL_BOTH_EDGES; + return 0; + default: + return -EINVAL; + } } static const struct counter_ops stm32_lptim_cnt_ops = { .count_read = stm32_lptim_cnt_read, - .function_get = stm32_lptim_cnt_function_get, - .function_set = stm32_lptim_cnt_function_set, - .action_get = stm32_lptim_cnt_action_get, - .action_set = stm32_lptim_cnt_action_set, + .function_read = stm32_lptim_cnt_function_read, + .function_write = stm32_lptim_cnt_function_write, + .action_read = stm32_lptim_cnt_action_read, + .action_write = stm32_lptim_cnt_action_write, }; static struct counter_signal stm32_lptim_cnt_signals[] = { @@ -629,56 +410,44 @@ static struct counter_count stm32_lptim_in1_counts = { static int stm32_lptim_cnt_probe(struct platform_device *pdev) { struct stm32_lptimer *ddata = dev_get_drvdata(pdev->dev.parent); + struct counter_device *counter; struct stm32_lptim_cnt *priv; - struct iio_dev *indio_dev; int ret; if (IS_ERR_OR_NULL(ddata)) return -EINVAL; - indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv)); - if (!indio_dev) + counter = devm_counter_alloc(&pdev->dev, sizeof(*priv)); + if (!counter) return -ENOMEM; + priv = counter_priv(counter); - priv = iio_priv(indio_dev); priv->dev = &pdev->dev; priv->regmap = ddata->regmap; priv->clk = ddata->clk; priv->ceiling = STM32_LPTIM_MAX_ARR; - /* Initialize IIO device */ - indio_dev->name = dev_name(&pdev->dev); - indio_dev->dev.parent = &pdev->dev; - indio_dev->dev.of_node = pdev->dev.of_node; - indio_dev->info = &stm32_lptim_cnt_iio_info; - if (ddata->has_encoder) - indio_dev->channels = &stm32_lptim_enc_channels; - else - indio_dev->channels = &stm32_lptim_cnt_channels; - indio_dev->num_channels = 1; - /* Initialize Counter device */ - priv->counter.name = dev_name(&pdev->dev); - priv->counter.parent = &pdev->dev; - priv->counter.ops = &stm32_lptim_cnt_ops; + counter->name = dev_name(&pdev->dev); + counter->parent = &pdev->dev; + counter->ops = &stm32_lptim_cnt_ops; if (ddata->has_encoder) { - priv->counter.counts = &stm32_lptim_enc_counts; - priv->counter.num_signals = ARRAY_SIZE(stm32_lptim_cnt_signals); + counter->counts = &stm32_lptim_enc_counts; + counter->num_signals = ARRAY_SIZE(stm32_lptim_cnt_signals); } else { - priv->counter.counts = &stm32_lptim_in1_counts; - priv->counter.num_signals = 1; + counter->counts = &stm32_lptim_in1_counts; + counter->num_signals = 1; } - priv->counter.num_counts = 1; - priv->counter.signals = stm32_lptim_cnt_signals; - priv->counter.priv = priv; + counter->num_counts = 1; + counter->signals = stm32_lptim_cnt_signals; platform_set_drvdata(pdev, priv); - ret = devm_iio_device_register(&pdev->dev, indio_dev); - if (ret) - return ret; + ret = devm_counter_add(&pdev->dev, counter); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "Failed to add counter\n"); - return devm_counter_register(&pdev->dev, &priv->counter); + return 0; } #ifdef CONFIG_PM_SLEEP @@ -751,3 +520,4 @@ MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>"); MODULE_ALIAS("platform:stm32-lptimer-counter"); MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM counter driver"); MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(COUNTER); diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c index 3eafccec3beb..9bf20a5d6bda 100644 --- a/drivers/counter/stm32-timer-cnt.c +++ b/drivers/counter/stm32-timer-cnt.c @@ -8,11 +8,12 @@ * */ #include <linux/counter.h> -#include <linux/iio/iio.h> -#include <linux/iio/types.h> #include <linux/mfd/stm32-timers.h> +#include <linux/mod_devicetable.h> #include <linux/module.h> +#include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> +#include <linux/types.h> #define TIM_CCMR_CCXS (BIT(8) | BIT(0)) #define TIM_CCMR_MASK (TIM_CCMR_CC1S | TIM_CCMR_CC2S | \ @@ -20,37 +21,32 @@ #define TIM_CCER_MASK (TIM_CCER_CC1P | TIM_CCER_CC1NP | \ TIM_CCER_CC2P | TIM_CCER_CC2NP) +struct stm32_timer_regs { + u32 cr1; + u32 cnt; + u32 smcr; + u32 arr; +}; + struct stm32_timer_cnt { - struct counter_device counter; struct regmap *regmap; struct clk *clk; - u32 ceiling; + u32 max_arr; + bool enabled; + struct stm32_timer_regs bak; }; -/** - * enum stm32_count_function - enumerates stm32 timer counter encoder modes - * @STM32_COUNT_SLAVE_MODE_DISABLED: counts on internal clock when CEN=1 - * @STM32_COUNT_ENCODER_MODE_1: counts TI1FP1 edges, depending on TI2FP2 level - * @STM32_COUNT_ENCODER_MODE_2: counts TI2FP2 edges, depending on TI1FP1 level - * @STM32_COUNT_ENCODER_MODE_3: counts on both TI1FP1 and TI2FP2 edges - */ -enum stm32_count_function { - STM32_COUNT_SLAVE_MODE_DISABLED = -1, - STM32_COUNT_ENCODER_MODE_1, - STM32_COUNT_ENCODER_MODE_2, - STM32_COUNT_ENCODER_MODE_3, -}; - -static enum counter_count_function stm32_count_functions[] = { - [STM32_COUNT_ENCODER_MODE_1] = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A, - [STM32_COUNT_ENCODER_MODE_2] = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B, - [STM32_COUNT_ENCODER_MODE_3] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4, +static const enum counter_function stm32_count_functions[] = { + COUNTER_FUNCTION_INCREASE, + COUNTER_FUNCTION_QUADRATURE_X2_A, + COUNTER_FUNCTION_QUADRATURE_X2_B, + COUNTER_FUNCTION_QUADRATURE_X4, }; static int stm32_count_read(struct counter_device *counter, - struct counter_count *count, unsigned long *val) + struct counter_count *count, u64 *val) { - struct stm32_timer_cnt *const priv = counter->priv; + struct stm32_timer_cnt *const priv = counter_priv(counter); u32 cnt; regmap_read(priv->regmap, TIM_CNT, &cnt); @@ -60,61 +56,67 @@ static int stm32_count_read(struct counter_device *counter, } static int stm32_count_write(struct counter_device *counter, - struct counter_count *count, - const unsigned long val) + struct counter_count *count, const u64 val) { - struct stm32_timer_cnt *const priv = counter->priv; + struct stm32_timer_cnt *const priv = counter_priv(counter); + u32 ceiling; - if (val > priv->ceiling) + regmap_read(priv->regmap, TIM_ARR, &ceiling); + if (val > ceiling) return -EINVAL; return regmap_write(priv->regmap, TIM_CNT, val); } -static int stm32_count_function_get(struct counter_device *counter, - struct counter_count *count, - size_t *function) +static int stm32_count_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) { - struct stm32_timer_cnt *const priv = counter->priv; + struct stm32_timer_cnt *const priv = counter_priv(counter); u32 smcr; regmap_read(priv->regmap, TIM_SMCR, &smcr); switch (smcr & TIM_SMCR_SMS) { - case 1: - *function = STM32_COUNT_ENCODER_MODE_1; + case TIM_SMCR_SMS_SLAVE_MODE_DISABLED: + *function = COUNTER_FUNCTION_INCREASE; + return 0; + case TIM_SMCR_SMS_ENCODER_MODE_1: + *function = COUNTER_FUNCTION_QUADRATURE_X2_A; return 0; - case 2: - *function = STM32_COUNT_ENCODER_MODE_2; + case TIM_SMCR_SMS_ENCODER_MODE_2: + *function = COUNTER_FUNCTION_QUADRATURE_X2_B; return 0; - case 3: - *function = STM32_COUNT_ENCODER_MODE_3; + case TIM_SMCR_SMS_ENCODER_MODE_3: + *function = COUNTER_FUNCTION_QUADRATURE_X4; return 0; + default: + return -EINVAL; } - - return -EINVAL; } -static int stm32_count_function_set(struct counter_device *counter, - struct counter_count *count, - size_t function) +static int stm32_count_function_write(struct counter_device *counter, + struct counter_count *count, + enum counter_function function) { - struct stm32_timer_cnt *const priv = counter->priv; + struct stm32_timer_cnt *const priv = counter_priv(counter); u32 cr1, sms; switch (function) { - case STM32_COUNT_ENCODER_MODE_1: - sms = 1; + case COUNTER_FUNCTION_INCREASE: + sms = TIM_SMCR_SMS_SLAVE_MODE_DISABLED; break; - case STM32_COUNT_ENCODER_MODE_2: - sms = 2; + case COUNTER_FUNCTION_QUADRATURE_X2_A: + sms = TIM_SMCR_SMS_ENCODER_MODE_1; break; - case STM32_COUNT_ENCODER_MODE_3: - sms = 3; + case COUNTER_FUNCTION_QUADRATURE_X2_B: + sms = TIM_SMCR_SMS_ENCODER_MODE_2; break; - default: - sms = 0; + case COUNTER_FUNCTION_QUADRATURE_X4: + sms = TIM_SMCR_SMS_ENCODER_MODE_3; break; + default: + return -EINVAL; } /* Store enable status */ @@ -122,10 +124,6 @@ static int stm32_count_function_set(struct counter_device *counter, regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_CEN, 0); - /* TIMx_ARR register shouldn't be buffered (ARPE=0) */ - regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, 0); - regmap_write(priv->regmap, TIM_ARR, priv->ceiling); - regmap_update_bits(priv->regmap, TIM_SMCR, TIM_SMCR_SMS, sms); /* Make sure that registers are updated */ @@ -137,78 +135,66 @@ static int stm32_count_function_set(struct counter_device *counter, return 0; } -static ssize_t stm32_count_direction_read(struct counter_device *counter, +static int stm32_count_direction_read(struct counter_device *counter, struct counter_count *count, - void *private, char *buf) + enum counter_count_direction *direction) { - struct stm32_timer_cnt *const priv = counter->priv; - const char *direction; + struct stm32_timer_cnt *const priv = counter_priv(counter); u32 cr1; regmap_read(priv->regmap, TIM_CR1, &cr1); - direction = (cr1 & TIM_CR1_DIR) ? "backward" : "forward"; + *direction = (cr1 & TIM_CR1_DIR) ? COUNTER_COUNT_DIRECTION_BACKWARD : + COUNTER_COUNT_DIRECTION_FORWARD; - return scnprintf(buf, PAGE_SIZE, "%s\n", direction); + return 0; } -static ssize_t stm32_count_ceiling_read(struct counter_device *counter, - struct counter_count *count, - void *private, char *buf) +static int stm32_count_ceiling_read(struct counter_device *counter, + struct counter_count *count, u64 *ceiling) { - struct stm32_timer_cnt *const priv = counter->priv; + struct stm32_timer_cnt *const priv = counter_priv(counter); u32 arr; regmap_read(priv->regmap, TIM_ARR, &arr); - return snprintf(buf, PAGE_SIZE, "%u\n", arr); + *ceiling = arr; + + return 0; } -static ssize_t stm32_count_ceiling_write(struct counter_device *counter, - struct counter_count *count, - void *private, - const char *buf, size_t len) +static int stm32_count_ceiling_write(struct counter_device *counter, + struct counter_count *count, u64 ceiling) { - struct stm32_timer_cnt *const priv = counter->priv; - unsigned int ceiling; - int ret; + struct stm32_timer_cnt *const priv = counter_priv(counter); - ret = kstrtouint(buf, 0, &ceiling); - if (ret) - return ret; + if (ceiling > priv->max_arr) + return -ERANGE; /* TIMx_ARR register shouldn't be buffered (ARPE=0) */ regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, 0); regmap_write(priv->regmap, TIM_ARR, ceiling); - priv->ceiling = ceiling; - return len; + return 0; } -static ssize_t stm32_count_enable_read(struct counter_device *counter, - struct counter_count *count, - void *private, char *buf) +static int stm32_count_enable_read(struct counter_device *counter, + struct counter_count *count, u8 *enable) { - struct stm32_timer_cnt *const priv = counter->priv; + struct stm32_timer_cnt *const priv = counter_priv(counter); u32 cr1; regmap_read(priv->regmap, TIM_CR1, &cr1); - return scnprintf(buf, PAGE_SIZE, "%d\n", (bool)(cr1 & TIM_CR1_CEN)); + *enable = cr1 & TIM_CR1_CEN; + + return 0; } -static ssize_t stm32_count_enable_write(struct counter_device *counter, - struct counter_count *count, - void *private, - const char *buf, size_t len) +static int stm32_count_enable_write(struct counter_device *counter, + struct counter_count *count, u8 enable) { - struct stm32_timer_cnt *const priv = counter->priv; - int err; + struct stm32_timer_cnt *const priv = counter_priv(counter); u32 cr1; - bool enable; - - err = kstrtobool(buf, &enable); - if (err) - return err; if (enable) { regmap_read(priv->regmap, TIM_CR1, &cr1); @@ -224,77 +210,70 @@ static ssize_t stm32_count_enable_write(struct counter_device *counter, clk_disable(priv->clk); } - return len; -} + /* Keep enabled state to properly handle low power states */ + priv->enabled = enable; -static const struct counter_count_ext stm32_count_ext[] = { - { - .name = "direction", - .read = stm32_count_direction_read, - }, - { - .name = "enable", - .read = stm32_count_enable_read, - .write = stm32_count_enable_write - }, - { - .name = "ceiling", - .read = stm32_count_ceiling_read, - .write = stm32_count_ceiling_write - }, -}; + return 0; +} -enum stm32_synapse_action { - STM32_SYNAPSE_ACTION_NONE, - STM32_SYNAPSE_ACTION_BOTH_EDGES +static struct counter_comp stm32_count_ext[] = { + COUNTER_COMP_DIRECTION(stm32_count_direction_read), + COUNTER_COMP_ENABLE(stm32_count_enable_read, stm32_count_enable_write), + COUNTER_COMP_CEILING(stm32_count_ceiling_read, + stm32_count_ceiling_write), }; -static enum counter_synapse_action stm32_synapse_actions[] = { - [STM32_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE, - [STM32_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES +static const enum counter_synapse_action stm32_synapse_actions[] = { + COUNTER_SYNAPSE_ACTION_NONE, + COUNTER_SYNAPSE_ACTION_BOTH_EDGES }; -static int stm32_action_get(struct counter_device *counter, - struct counter_count *count, - struct counter_synapse *synapse, - size_t *action) +static int stm32_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) { - size_t function; + enum counter_function function; int err; - /* Default action mode (e.g. STM32_COUNT_SLAVE_MODE_DISABLED) */ - *action = STM32_SYNAPSE_ACTION_NONE; - - err = stm32_count_function_get(counter, count, &function); + err = stm32_count_function_read(counter, count, &function); if (err) - return 0; + return err; switch (function) { - case STM32_COUNT_ENCODER_MODE_1: + case COUNTER_FUNCTION_INCREASE: + /* counts on internal clock when CEN=1 */ + *action = COUNTER_SYNAPSE_ACTION_NONE; + return 0; + case COUNTER_FUNCTION_QUADRATURE_X2_A: /* counts up/down on TI1FP1 edge depending on TI2FP2 level */ if (synapse->signal->id == count->synapses[0].signal->id) - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES; - break; - case STM32_COUNT_ENCODER_MODE_2: + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + else + *action = COUNTER_SYNAPSE_ACTION_NONE; + return 0; + case COUNTER_FUNCTION_QUADRATURE_X2_B: /* counts up/down on TI2FP2 edge depending on TI1FP1 level */ if (synapse->signal->id == count->synapses[1].signal->id) - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES; - break; - case STM32_COUNT_ENCODER_MODE_3: + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + else + *action = COUNTER_SYNAPSE_ACTION_NONE; + return 0; + case COUNTER_FUNCTION_QUADRATURE_X4: /* counts up/down on both TI1FP1 and TI2FP2 edges */ - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES; - break; + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + return 0; + default: + return -EINVAL; } - - return 0; } static const struct counter_ops stm32_timer_cnt_ops = { .count_read = stm32_count_read, .count_write = stm32_count_write, - .function_get = stm32_count_function_get, - .function_set = stm32_count_function_set, - .action_get = stm32_action_get, + .function_read = stm32_count_function_read, + .function_write = stm32_count_function_write, + .action_read = stm32_action_read, }; static struct counter_signal stm32_signals[] = { @@ -337,31 +316,87 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev) struct stm32_timers *ddata = dev_get_drvdata(pdev->dev.parent); struct device *dev = &pdev->dev; struct stm32_timer_cnt *priv; + struct counter_device *counter; + int ret; if (IS_ERR_OR_NULL(ddata)) return -EINVAL; - priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); - if (!priv) + counter = devm_counter_alloc(dev, sizeof(*priv)); + if (!counter) return -ENOMEM; + priv = counter_priv(counter); + priv->regmap = ddata->regmap; priv->clk = ddata->clk; - priv->ceiling = ddata->max_arr; + priv->max_arr = ddata->max_arr; + + counter->name = dev_name(dev); + counter->parent = dev; + counter->ops = &stm32_timer_cnt_ops; + counter->counts = &stm32_counts; + counter->num_counts = 1; + counter->signals = stm32_signals; + counter->num_signals = ARRAY_SIZE(stm32_signals); - priv->counter.name = dev_name(dev); - priv->counter.parent = dev; - priv->counter.ops = &stm32_timer_cnt_ops; - priv->counter.counts = &stm32_counts; - priv->counter.num_counts = 1; - priv->counter.signals = stm32_signals; - priv->counter.num_signals = ARRAY_SIZE(stm32_signals); - priv->counter.priv = priv; + platform_set_drvdata(pdev, priv); /* Register Counter device */ - return devm_counter_register(dev, &priv->counter); + ret = devm_counter_add(dev, counter); + if (ret < 0) + dev_err_probe(dev, ret, "Failed to add counter\n"); + + return ret; } +static int __maybe_unused stm32_timer_cnt_suspend(struct device *dev) +{ + struct stm32_timer_cnt *priv = dev_get_drvdata(dev); + + /* Only take care of enabled counter: don't disturb other MFD child */ + if (priv->enabled) { + /* Backup registers that may get lost in low power mode */ + regmap_read(priv->regmap, TIM_SMCR, &priv->bak.smcr); + regmap_read(priv->regmap, TIM_ARR, &priv->bak.arr); + regmap_read(priv->regmap, TIM_CNT, &priv->bak.cnt); + regmap_read(priv->regmap, TIM_CR1, &priv->bak.cr1); + + /* Disable the counter */ + regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_CEN, 0); + clk_disable(priv->clk); + } + + return pinctrl_pm_select_sleep_state(dev); +} + +static int __maybe_unused stm32_timer_cnt_resume(struct device *dev) +{ + struct stm32_timer_cnt *priv = dev_get_drvdata(dev); + int ret; + + ret = pinctrl_pm_select_default_state(dev); + if (ret) + return ret; + + if (priv->enabled) { + clk_enable(priv->clk); + + /* Restore registers that may have been lost */ + regmap_write(priv->regmap, TIM_SMCR, priv->bak.smcr); + regmap_write(priv->regmap, TIM_ARR, priv->bak.arr); + regmap_write(priv->regmap, TIM_CNT, priv->bak.cnt); + + /* Also re-enables the counter */ + regmap_write(priv->regmap, TIM_CR1, priv->bak.cr1); + } + + return 0; +} + +static SIMPLE_DEV_PM_OPS(stm32_timer_cnt_pm_ops, stm32_timer_cnt_suspend, + stm32_timer_cnt_resume); + static const struct of_device_id stm32_timer_cnt_of_match[] = { { .compatible = "st,stm32-timer-counter", }, {}, @@ -373,6 +408,7 @@ static struct platform_driver stm32_timer_cnt_driver = { .driver = { .name = "stm32-timer-counter", .of_match_table = stm32_timer_cnt_of_match, + .pm = &stm32_timer_cnt_pm_ops, }, }; module_platform_driver(stm32_timer_cnt_driver); @@ -381,3 +417,4 @@ MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); MODULE_ALIAS("platform:stm32-timer-counter"); MODULE_DESCRIPTION("STMicroelectronics STM32 TIMER counter driver"); MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(COUNTER); diff --git a/drivers/counter/ti-ecap-capture.c b/drivers/counter/ti-ecap-capture.c new file mode 100644 index 000000000000..fb1cb1774674 --- /dev/null +++ b/drivers/counter/ti-ecap-capture.c @@ -0,0 +1,615 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ECAP Capture driver + * + * Copyright (C) 2022 Julien Panis <jpanis@baylibre.com> + */ + +#include <linux/atomic.h> +#include <linux/clk.h> +#include <linux/counter.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> + +#define ECAP_DRV_NAME "ecap" + +/* ECAP event IDs */ +#define ECAP_CEVT1 0 +#define ECAP_CEVT2 1 +#define ECAP_CEVT3 2 +#define ECAP_CEVT4 3 +#define ECAP_CNTOVF 4 + +#define ECAP_CEVT_LAST ECAP_CEVT4 +#define ECAP_NB_CEVT (ECAP_CEVT_LAST + 1) + +#define ECAP_EVT_LAST ECAP_CNTOVF +#define ECAP_NB_EVT (ECAP_EVT_LAST + 1) + +/* Registers */ +#define ECAP_TSCNT_REG 0x00 + +#define ECAP_CAP_REG(i) (((i) << 2) + 0x08) + +#define ECAP_ECCTL_REG 0x28 +#define ECAP_CAPPOL_BIT(i) BIT((i) << 1) +#define ECAP_EV_MODE_MASK GENMASK(7, 0) +#define ECAP_CAPLDEN_BIT BIT(8) +#define ECAP_CONT_ONESHT_BIT BIT(16) +#define ECAP_STOPVALUE_MASK GENMASK(18, 17) +#define ECAP_TSCNTSTP_BIT BIT(20) +#define ECAP_SYNCO_DIS_MASK GENMASK(23, 22) +#define ECAP_CAP_APWM_BIT BIT(25) +#define ECAP_ECCTL_EN_MASK (ECAP_CAPLDEN_BIT | ECAP_TSCNTSTP_BIT) +#define ECAP_ECCTL_CFG_MASK (ECAP_SYNCO_DIS_MASK | ECAP_STOPVALUE_MASK \ + | ECAP_ECCTL_EN_MASK | ECAP_CAP_APWM_BIT \ + | ECAP_CONT_ONESHT_BIT) + +#define ECAP_ECINT_EN_FLG_REG 0x2c +#define ECAP_EVT_EN_MASK GENMASK(ECAP_NB_EVT, ECAP_NB_CEVT) +#define ECAP_EVT_FLG_BIT(i) BIT((i) + 17) + +#define ECAP_ECINT_CLR_FRC_REG 0x30 +#define ECAP_INT_CLR_BIT BIT(0) +#define ECAP_EVT_CLR_BIT(i) BIT((i) + 1) +#define ECAP_EVT_CLR_MASK GENMASK(ECAP_NB_EVT, 0) + +#define ECAP_PID_REG 0x5c + +/* ECAP signals */ +#define ECAP_CLOCK_SIG 0 +#define ECAP_INPUT_SIG 1 + +static const struct regmap_config ecap_cnt_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = ECAP_PID_REG, +}; + +/** + * struct ecap_cnt_dev - device private data structure + * @enabled: device state + * @lock: synchronization lock to prevent I/O race conditions + * @clk: device clock + * @regmap: device register map + * @nb_ovf: number of overflows since capture start + * @pm_ctx: device context for PM operations + * @pm_ctx.ev_mode: event mode bits + * @pm_ctx.time_cntr: timestamp counter value + */ +struct ecap_cnt_dev { + bool enabled; + struct mutex lock; + struct clk *clk; + struct regmap *regmap; + atomic_t nb_ovf; + struct { + u8 ev_mode; + u32 time_cntr; + } pm_ctx; +}; + +static u8 ecap_cnt_capture_get_evmode(struct counter_device *counter) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + unsigned int regval; + + pm_runtime_get_sync(counter->parent); + regmap_read(ecap_dev->regmap, ECAP_ECCTL_REG, ®val); + pm_runtime_put_sync(counter->parent); + + return regval; +} + +static void ecap_cnt_capture_set_evmode(struct counter_device *counter, u8 ev_mode) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + pm_runtime_get_sync(counter->parent); + regmap_update_bits(ecap_dev->regmap, ECAP_ECCTL_REG, ECAP_EV_MODE_MASK, ev_mode); + pm_runtime_put_sync(counter->parent); +} + +static void ecap_cnt_capture_enable(struct counter_device *counter) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + pm_runtime_get_sync(counter->parent); + + /* Enable interrupts on events */ + regmap_update_bits(ecap_dev->regmap, ECAP_ECINT_EN_FLG_REG, + ECAP_EVT_EN_MASK, ECAP_EVT_EN_MASK); + + /* Run counter */ + regmap_update_bits(ecap_dev->regmap, ECAP_ECCTL_REG, ECAP_ECCTL_CFG_MASK, + ECAP_SYNCO_DIS_MASK | ECAP_STOPVALUE_MASK | ECAP_ECCTL_EN_MASK); +} + +static void ecap_cnt_capture_disable(struct counter_device *counter) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + /* Stop counter */ + regmap_update_bits(ecap_dev->regmap, ECAP_ECCTL_REG, ECAP_ECCTL_EN_MASK, 0); + + /* Disable interrupts on events */ + regmap_update_bits(ecap_dev->regmap, ECAP_ECINT_EN_FLG_REG, ECAP_EVT_EN_MASK, 0); + + pm_runtime_put_sync(counter->parent); +} + +static u32 ecap_cnt_count_get_val(struct counter_device *counter, unsigned int reg) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + unsigned int regval; + + pm_runtime_get_sync(counter->parent); + regmap_read(ecap_dev->regmap, reg, ®val); + pm_runtime_put_sync(counter->parent); + + return regval; +} + +static void ecap_cnt_count_set_val(struct counter_device *counter, unsigned int reg, u32 val) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + pm_runtime_get_sync(counter->parent); + regmap_write(ecap_dev->regmap, reg, val); + pm_runtime_put_sync(counter->parent); +} + +static int ecap_cnt_count_read(struct counter_device *counter, + struct counter_count *count, u64 *val) +{ + *val = ecap_cnt_count_get_val(counter, ECAP_TSCNT_REG); + + return 0; +} + +static int ecap_cnt_count_write(struct counter_device *counter, + struct counter_count *count, u64 val) +{ + if (val > U32_MAX) + return -ERANGE; + + ecap_cnt_count_set_val(counter, ECAP_TSCNT_REG, val); + + return 0; +} + +static int ecap_cnt_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) +{ + *function = COUNTER_FUNCTION_INCREASE; + + return 0; +} + +static int ecap_cnt_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) +{ + *action = (synapse->signal->id == ECAP_CLOCK_SIG) ? + COUNTER_SYNAPSE_ACTION_RISING_EDGE : + COUNTER_SYNAPSE_ACTION_NONE; + + return 0; +} + +static int ecap_cnt_watch_validate(struct counter_device *counter, + const struct counter_watch *watch) +{ + if (watch->channel > ECAP_CEVT_LAST) + return -EINVAL; + + switch (watch->event) { + case COUNTER_EVENT_CAPTURE: + case COUNTER_EVENT_OVERFLOW: + return 0; + default: + return -EINVAL; + } +} + +static int ecap_cnt_clk_get_freq(struct counter_device *counter, + struct counter_signal *signal, u64 *freq) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + *freq = clk_get_rate(ecap_dev->clk); + + return 0; +} + +static int ecap_cnt_pol_read(struct counter_device *counter, + struct counter_signal *signal, + size_t idx, enum counter_signal_polarity *pol) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + int bitval; + + pm_runtime_get_sync(counter->parent); + bitval = regmap_test_bits(ecap_dev->regmap, ECAP_ECCTL_REG, ECAP_CAPPOL_BIT(idx)); + pm_runtime_put_sync(counter->parent); + + *pol = bitval ? COUNTER_SIGNAL_POLARITY_NEGATIVE : COUNTER_SIGNAL_POLARITY_POSITIVE; + + return 0; +} + +static int ecap_cnt_pol_write(struct counter_device *counter, + struct counter_signal *signal, + size_t idx, enum counter_signal_polarity pol) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + pm_runtime_get_sync(counter->parent); + if (pol == COUNTER_SIGNAL_POLARITY_NEGATIVE) + regmap_set_bits(ecap_dev->regmap, ECAP_ECCTL_REG, ECAP_CAPPOL_BIT(idx)); + else + regmap_clear_bits(ecap_dev->regmap, ECAP_ECCTL_REG, ECAP_CAPPOL_BIT(idx)); + pm_runtime_put_sync(counter->parent); + + return 0; +} + +static int ecap_cnt_cap_read(struct counter_device *counter, + struct counter_count *count, + size_t idx, u64 *cap) +{ + *cap = ecap_cnt_count_get_val(counter, ECAP_CAP_REG(idx)); + + return 0; +} + +static int ecap_cnt_cap_write(struct counter_device *counter, + struct counter_count *count, + size_t idx, u64 cap) +{ + if (cap > U32_MAX) + return -ERANGE; + + ecap_cnt_count_set_val(counter, ECAP_CAP_REG(idx), cap); + + return 0; +} + +static int ecap_cnt_nb_ovf_read(struct counter_device *counter, + struct counter_count *count, u64 *val) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + *val = atomic_read(&ecap_dev->nb_ovf); + + return 0; +} + +static int ecap_cnt_nb_ovf_write(struct counter_device *counter, + struct counter_count *count, u64 val) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + if (val > U32_MAX) + return -ERANGE; + + atomic_set(&ecap_dev->nb_ovf, val); + + return 0; +} + +static int ecap_cnt_ceiling_read(struct counter_device *counter, + struct counter_count *count, u64 *val) +{ + *val = U32_MAX; + + return 0; +} + +static int ecap_cnt_enable_read(struct counter_device *counter, + struct counter_count *count, u8 *enable) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + *enable = ecap_dev->enabled; + + return 0; +} + +static int ecap_cnt_enable_write(struct counter_device *counter, + struct counter_count *count, u8 enable) +{ + struct ecap_cnt_dev *ecap_dev = counter_priv(counter); + + mutex_lock(&ecap_dev->lock); + + if (enable == ecap_dev->enabled) + goto out; + + if (enable) + ecap_cnt_capture_enable(counter); + else + ecap_cnt_capture_disable(counter); + ecap_dev->enabled = enable; + +out: + mutex_unlock(&ecap_dev->lock); + + return 0; +} + +static const struct counter_ops ecap_cnt_ops = { + .count_read = ecap_cnt_count_read, + .count_write = ecap_cnt_count_write, + .function_read = ecap_cnt_function_read, + .action_read = ecap_cnt_action_read, + .watch_validate = ecap_cnt_watch_validate, +}; + +static const enum counter_function ecap_cnt_functions[] = { + COUNTER_FUNCTION_INCREASE, +}; + +static const enum counter_synapse_action ecap_cnt_clock_actions[] = { + COUNTER_SYNAPSE_ACTION_RISING_EDGE, +}; + +static const enum counter_synapse_action ecap_cnt_input_actions[] = { + COUNTER_SYNAPSE_ACTION_NONE, +}; + +static struct counter_comp ecap_cnt_clock_ext[] = { + COUNTER_COMP_SIGNAL_U64("frequency", ecap_cnt_clk_get_freq, NULL), +}; + +static const enum counter_signal_polarity ecap_cnt_pol_avail[] = { + COUNTER_SIGNAL_POLARITY_POSITIVE, + COUNTER_SIGNAL_POLARITY_NEGATIVE, +}; + +static DEFINE_COUNTER_AVAILABLE(ecap_cnt_pol_available, ecap_cnt_pol_avail); +static DEFINE_COUNTER_ARRAY_POLARITY(ecap_cnt_pol_array, ecap_cnt_pol_available, ECAP_NB_CEVT); + +static struct counter_comp ecap_cnt_signal_ext[] = { + COUNTER_COMP_ARRAY_POLARITY(ecap_cnt_pol_read, ecap_cnt_pol_write, ecap_cnt_pol_array), +}; + +static struct counter_signal ecap_cnt_signals[] = { + { + .id = ECAP_CLOCK_SIG, + .name = "Clock Signal", + .ext = ecap_cnt_clock_ext, + .num_ext = ARRAY_SIZE(ecap_cnt_clock_ext), + }, + { + .id = ECAP_INPUT_SIG, + .name = "Input Signal", + .ext = ecap_cnt_signal_ext, + .num_ext = ARRAY_SIZE(ecap_cnt_signal_ext), + }, +}; + +static struct counter_synapse ecap_cnt_synapses[] = { + { + .actions_list = ecap_cnt_clock_actions, + .num_actions = ARRAY_SIZE(ecap_cnt_clock_actions), + .signal = &ecap_cnt_signals[ECAP_CLOCK_SIG], + }, + { + .actions_list = ecap_cnt_input_actions, + .num_actions = ARRAY_SIZE(ecap_cnt_input_actions), + .signal = &ecap_cnt_signals[ECAP_INPUT_SIG], + }, +}; + +static DEFINE_COUNTER_ARRAY_CAPTURE(ecap_cnt_cap_array, ECAP_NB_CEVT); + +static struct counter_comp ecap_cnt_count_ext[] = { + COUNTER_COMP_ARRAY_CAPTURE(ecap_cnt_cap_read, ecap_cnt_cap_write, ecap_cnt_cap_array), + COUNTER_COMP_COUNT_U64("num_overflows", ecap_cnt_nb_ovf_read, ecap_cnt_nb_ovf_write), + COUNTER_COMP_CEILING(ecap_cnt_ceiling_read, NULL), + COUNTER_COMP_ENABLE(ecap_cnt_enable_read, ecap_cnt_enable_write), +}; + +static struct counter_count ecap_cnt_counts[] = { + { + .name = "Timestamp Counter", + .functions_list = ecap_cnt_functions, + .num_functions = ARRAY_SIZE(ecap_cnt_functions), + .synapses = ecap_cnt_synapses, + .num_synapses = ARRAY_SIZE(ecap_cnt_synapses), + .ext = ecap_cnt_count_ext, + .num_ext = ARRAY_SIZE(ecap_cnt_count_ext), + }, +}; + +static irqreturn_t ecap_cnt_isr(int irq, void *dev_id) +{ + struct counter_device *counter_dev = dev_id; + struct ecap_cnt_dev *ecap_dev = counter_priv(counter_dev); + unsigned int clr = 0; + unsigned int flg; + int i; + + regmap_read(ecap_dev->regmap, ECAP_ECINT_EN_FLG_REG, &flg); + + /* Check capture events */ + for (i = 0 ; i < ECAP_NB_CEVT ; i++) { + if (flg & ECAP_EVT_FLG_BIT(i)) { + counter_push_event(counter_dev, COUNTER_EVENT_CAPTURE, i); + clr |= ECAP_EVT_CLR_BIT(i); + } + } + + /* Check counter overflow */ + if (flg & ECAP_EVT_FLG_BIT(ECAP_CNTOVF)) { + atomic_inc(&ecap_dev->nb_ovf); + for (i = 0 ; i < ECAP_NB_CEVT ; i++) + counter_push_event(counter_dev, COUNTER_EVENT_OVERFLOW, i); + clr |= ECAP_EVT_CLR_BIT(ECAP_CNTOVF); + } + + clr |= ECAP_INT_CLR_BIT; + regmap_update_bits(ecap_dev->regmap, ECAP_ECINT_CLR_FRC_REG, ECAP_EVT_CLR_MASK, clr); + + return IRQ_HANDLED; +} + +static void ecap_cnt_pm_disable(void *dev) +{ + pm_runtime_disable(dev); +} + +static int ecap_cnt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ecap_cnt_dev *ecap_dev; + struct counter_device *counter_dev; + void __iomem *mmio_base; + unsigned long clk_rate; + int ret; + + counter_dev = devm_counter_alloc(dev, sizeof(*ecap_dev)); + if (!counter_dev) + return -ENOMEM; + + counter_dev->name = ECAP_DRV_NAME; + counter_dev->parent = dev; + counter_dev->ops = &ecap_cnt_ops; + counter_dev->signals = ecap_cnt_signals; + counter_dev->num_signals = ARRAY_SIZE(ecap_cnt_signals); + counter_dev->counts = ecap_cnt_counts; + counter_dev->num_counts = ARRAY_SIZE(ecap_cnt_counts); + + ecap_dev = counter_priv(counter_dev); + + mutex_init(&ecap_dev->lock); + + ecap_dev->clk = devm_clk_get_enabled(dev, "fck"); + if (IS_ERR(ecap_dev->clk)) + return dev_err_probe(dev, PTR_ERR(ecap_dev->clk), "failed to get clock\n"); + + clk_rate = clk_get_rate(ecap_dev->clk); + if (!clk_rate) { + dev_err(dev, "failed to get clock rate\n"); + return -EINVAL; + } + + mmio_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mmio_base)) + return PTR_ERR(mmio_base); + + ecap_dev->regmap = devm_regmap_init_mmio(dev, mmio_base, &ecap_cnt_regmap_config); + if (IS_ERR(ecap_dev->regmap)) + return dev_err_probe(dev, PTR_ERR(ecap_dev->regmap), "failed to init regmap\n"); + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return dev_err_probe(dev, ret, "failed to get irq\n"); + + ret = devm_request_irq(dev, ret, ecap_cnt_isr, 0, pdev->name, counter_dev); + if (ret) + return dev_err_probe(dev, ret, "failed to request irq\n"); + + platform_set_drvdata(pdev, counter_dev); + + pm_runtime_enable(dev); + + /* Register a cleanup callback to care for disabling PM */ + ret = devm_add_action_or_reset(dev, ecap_cnt_pm_disable, dev); + if (ret) + return dev_err_probe(dev, ret, "failed to add pm disable action\n"); + + ret = devm_counter_add(dev, counter_dev); + if (ret) + return dev_err_probe(dev, ret, "failed to add counter\n"); + + return 0; +} + +static int ecap_cnt_remove(struct platform_device *pdev) +{ + struct counter_device *counter_dev = platform_get_drvdata(pdev); + struct ecap_cnt_dev *ecap_dev = counter_priv(counter_dev); + + if (ecap_dev->enabled) + ecap_cnt_capture_disable(counter_dev); + + return 0; +} + +static int ecap_cnt_suspend(struct device *dev) +{ + struct counter_device *counter_dev = dev_get_drvdata(dev); + struct ecap_cnt_dev *ecap_dev = counter_priv(counter_dev); + + /* If eCAP is running, stop capture then save timestamp counter */ + if (ecap_dev->enabled) { + /* + * Disabling capture has the following effects: + * - interrupts are disabled + * - loading of capture registers is disabled + * - timebase counter is stopped + */ + ecap_cnt_capture_disable(counter_dev); + ecap_dev->pm_ctx.time_cntr = ecap_cnt_count_get_val(counter_dev, ECAP_TSCNT_REG); + } + + ecap_dev->pm_ctx.ev_mode = ecap_cnt_capture_get_evmode(counter_dev); + + clk_disable(ecap_dev->clk); + + return 0; +} + +static int ecap_cnt_resume(struct device *dev) +{ + struct counter_device *counter_dev = dev_get_drvdata(dev); + struct ecap_cnt_dev *ecap_dev = counter_priv(counter_dev); + + clk_enable(ecap_dev->clk); + + ecap_cnt_capture_set_evmode(counter_dev, ecap_dev->pm_ctx.ev_mode); + + /* If eCAP was running, restore timestamp counter then run capture */ + if (ecap_dev->enabled) { + ecap_cnt_count_set_val(counter_dev, ECAP_TSCNT_REG, ecap_dev->pm_ctx.time_cntr); + ecap_cnt_capture_enable(counter_dev); + } + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(ecap_cnt_pm_ops, ecap_cnt_suspend, ecap_cnt_resume); + +static const struct of_device_id ecap_cnt_of_match[] = { + { .compatible = "ti,am62-ecap-capture" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ecap_cnt_of_match); + +static struct platform_driver ecap_cnt_driver = { + .probe = ecap_cnt_probe, + .remove = ecap_cnt_remove, + .driver = { + .name = "ecap-capture", + .of_match_table = ecap_cnt_of_match, + .pm = pm_sleep_ptr(&ecap_cnt_pm_ops), + }, +}; +module_platform_driver(ecap_cnt_driver); + +MODULE_DESCRIPTION("ECAP Capture driver"); +MODULE_AUTHOR("Julien Panis <jpanis@baylibre.com>"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(COUNTER); diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c index 1ff07faef27f..b0f24cf3e891 100644 --- a/drivers/counter/ti-eqep.c +++ b/drivers/counter/ti-eqep.c @@ -13,6 +13,7 @@ #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/regmap.h> +#include <linux/types.h> /* 32-bit registers */ #define QPOSCNT 0x0 @@ -73,29 +74,28 @@ enum { }; /* Position Counter Input Modes */ -enum { +enum ti_eqep_count_func { TI_EQEP_COUNT_FUNC_QUAD_COUNT, TI_EQEP_COUNT_FUNC_DIR_COUNT, TI_EQEP_COUNT_FUNC_UP_COUNT, TI_EQEP_COUNT_FUNC_DOWN_COUNT, }; -enum { - TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES, - TI_EQEP_SYNAPSE_ACTION_RISING_EDGE, - TI_EQEP_SYNAPSE_ACTION_NONE, -}; - struct ti_eqep_cnt { struct counter_device counter; struct regmap *regmap32; struct regmap *regmap16; }; +static struct ti_eqep_cnt *ti_eqep_count_from_counter(struct counter_device *counter) +{ + return counter_priv(counter); +} + static int ti_eqep_count_read(struct counter_device *counter, - struct counter_count *count, unsigned long *val) + struct counter_count *count, u64 *val) { - struct ti_eqep_cnt *priv = counter->priv; + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); u32 cnt; regmap_read(priv->regmap32, QPOSCNT, &cnt); @@ -105,9 +105,9 @@ static int ti_eqep_count_read(struct counter_device *counter, } static int ti_eqep_count_write(struct counter_device *counter, - struct counter_count *count, unsigned long val) + struct counter_count *count, u64 val) { - struct ti_eqep_cnt *priv = counter->priv; + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); u32 max; regmap_read(priv->regmap32, QPOSMAX, &max); @@ -117,62 +117,100 @@ static int ti_eqep_count_write(struct counter_device *counter, return regmap_write(priv->regmap32, QPOSCNT, val); } -static int ti_eqep_function_get(struct counter_device *counter, - struct counter_count *count, size_t *function) +static int ti_eqep_function_read(struct counter_device *counter, + struct counter_count *count, + enum counter_function *function) { - struct ti_eqep_cnt *priv = counter->priv; + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); u32 qdecctl; regmap_read(priv->regmap16, QDECCTL, &qdecctl); - *function = (qdecctl & QDECCTL_QSRC) >> QDECCTL_QSRC_SHIFT; + + switch ((qdecctl & QDECCTL_QSRC) >> QDECCTL_QSRC_SHIFT) { + case TI_EQEP_COUNT_FUNC_QUAD_COUNT: + *function = COUNTER_FUNCTION_QUADRATURE_X4; + break; + case TI_EQEP_COUNT_FUNC_DIR_COUNT: + *function = COUNTER_FUNCTION_PULSE_DIRECTION; + break; + case TI_EQEP_COUNT_FUNC_UP_COUNT: + *function = COUNTER_FUNCTION_INCREASE; + break; + case TI_EQEP_COUNT_FUNC_DOWN_COUNT: + *function = COUNTER_FUNCTION_DECREASE; + break; + } return 0; } -static int ti_eqep_function_set(struct counter_device *counter, - struct counter_count *count, size_t function) +static int ti_eqep_function_write(struct counter_device *counter, + struct counter_count *count, + enum counter_function function) { - struct ti_eqep_cnt *priv = counter->priv; + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); + enum ti_eqep_count_func qsrc; + + switch (function) { + case COUNTER_FUNCTION_QUADRATURE_X4: + qsrc = TI_EQEP_COUNT_FUNC_QUAD_COUNT; + break; + case COUNTER_FUNCTION_PULSE_DIRECTION: + qsrc = TI_EQEP_COUNT_FUNC_DIR_COUNT; + break; + case COUNTER_FUNCTION_INCREASE: + qsrc = TI_EQEP_COUNT_FUNC_UP_COUNT; + break; + case COUNTER_FUNCTION_DECREASE: + qsrc = TI_EQEP_COUNT_FUNC_DOWN_COUNT; + break; + default: + /* should never reach this path */ + return -EINVAL; + } return regmap_write_bits(priv->regmap16, QDECCTL, QDECCTL_QSRC, - function << QDECCTL_QSRC_SHIFT); + qsrc << QDECCTL_QSRC_SHIFT); } -static int ti_eqep_action_get(struct counter_device *counter, - struct counter_count *count, - struct counter_synapse *synapse, size_t *action) +static int ti_eqep_action_read(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + enum counter_synapse_action *action) { - struct ti_eqep_cnt *priv = counter->priv; - size_t function; + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); + enum counter_function function; u32 qdecctl; int err; - err = ti_eqep_function_get(counter, count, &function); + err = ti_eqep_function_read(counter, count, &function); if (err) return err; switch (function) { - case TI_EQEP_COUNT_FUNC_QUAD_COUNT: + case COUNTER_FUNCTION_QUADRATURE_X4: /* In quadrature mode, the rising and falling edge of both * QEPA and QEPB trigger QCLK. */ - *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES; - break; - case TI_EQEP_COUNT_FUNC_DIR_COUNT: + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + return 0; + case COUNTER_FUNCTION_PULSE_DIRECTION: /* In direction-count mode only rising edge of QEPA is counted * and QEPB gives direction. */ switch (synapse->signal->id) { case TI_EQEP_SIGNAL_QEPA: - *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE; - break; + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; + return 0; + case TI_EQEP_SIGNAL_QEPB: + *action = COUNTER_SYNAPSE_ACTION_NONE; + return 0; default: - *action = TI_EQEP_SYNAPSE_ACTION_NONE; - break; + /* should never reach this path */ + return -EINVAL; } - break; - case TI_EQEP_COUNT_FUNC_UP_COUNT: - case TI_EQEP_COUNT_FUNC_DOWN_COUNT: + case COUNTER_FUNCTION_INCREASE: + case COUNTER_FUNCTION_DECREASE: /* In up/down-count modes only QEPA is counted and QEPB is not * used. */ @@ -183,134 +221,87 @@ static int ti_eqep_action_get(struct counter_device *counter, return err; if (qdecctl & QDECCTL_XCR) - *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES; + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; else - *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE; - break; + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; + return 0; + case TI_EQEP_SIGNAL_QEPB: + *action = COUNTER_SYNAPSE_ACTION_NONE; + return 0; default: - *action = TI_EQEP_SYNAPSE_ACTION_NONE; - break; + /* should never reach this path */ + return -EINVAL; } - break; + default: + /* should never reach this path */ + return -EINVAL; } - - return 0; } static const struct counter_ops ti_eqep_counter_ops = { .count_read = ti_eqep_count_read, .count_write = ti_eqep_count_write, - .function_get = ti_eqep_function_get, - .function_set = ti_eqep_function_set, - .action_get = ti_eqep_action_get, + .function_read = ti_eqep_function_read, + .function_write = ti_eqep_function_write, + .action_read = ti_eqep_action_read, }; -static ssize_t ti_eqep_position_ceiling_read(struct counter_device *counter, - struct counter_count *count, - void *ext_priv, char *buf) +static int ti_eqep_position_ceiling_read(struct counter_device *counter, + struct counter_count *count, + u64 *ceiling) { - struct ti_eqep_cnt *priv = counter->priv; + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); u32 qposmax; regmap_read(priv->regmap32, QPOSMAX, &qposmax); - return sprintf(buf, "%u\n", qposmax); -} - -static ssize_t ti_eqep_position_ceiling_write(struct counter_device *counter, - struct counter_count *count, - void *ext_priv, const char *buf, - size_t len) -{ - struct ti_eqep_cnt *priv = counter->priv; - int err; - u32 res; - - err = kstrtouint(buf, 0, &res); - if (err < 0) - return err; - - regmap_write(priv->regmap32, QPOSMAX, res); + *ceiling = qposmax; - return len; + return 0; } -static ssize_t ti_eqep_position_floor_read(struct counter_device *counter, - struct counter_count *count, - void *ext_priv, char *buf) +static int ti_eqep_position_ceiling_write(struct counter_device *counter, + struct counter_count *count, + u64 ceiling) { - struct ti_eqep_cnt *priv = counter->priv; - u32 qposinit; - - regmap_read(priv->regmap32, QPOSINIT, &qposinit); + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); - return sprintf(buf, "%u\n", qposinit); -} + if (ceiling != (u32)ceiling) + return -ERANGE; -static ssize_t ti_eqep_position_floor_write(struct counter_device *counter, - struct counter_count *count, - void *ext_priv, const char *buf, - size_t len) -{ - struct ti_eqep_cnt *priv = counter->priv; - int err; - u32 res; + regmap_write(priv->regmap32, QPOSMAX, ceiling); - err = kstrtouint(buf, 0, &res); - if (err < 0) - return err; - - regmap_write(priv->regmap32, QPOSINIT, res); - - return len; + return 0; } -static ssize_t ti_eqep_position_enable_read(struct counter_device *counter, - struct counter_count *count, - void *ext_priv, char *buf) +static int ti_eqep_position_enable_read(struct counter_device *counter, + struct counter_count *count, u8 *enable) { - struct ti_eqep_cnt *priv = counter->priv; + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); u32 qepctl; regmap_read(priv->regmap16, QEPCTL, &qepctl); - return sprintf(buf, "%u\n", !!(qepctl & QEPCTL_PHEN)); + *enable = !!(qepctl & QEPCTL_PHEN); + + return 0; } -static ssize_t ti_eqep_position_enable_write(struct counter_device *counter, - struct counter_count *count, - void *ext_priv, const char *buf, - size_t len) +static int ti_eqep_position_enable_write(struct counter_device *counter, + struct counter_count *count, u8 enable) { - struct ti_eqep_cnt *priv = counter->priv; - int err; - bool res; - - err = kstrtobool(buf, &res); - if (err < 0) - return err; + struct ti_eqep_cnt *priv = ti_eqep_count_from_counter(counter); - regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, res ? -1 : 0); + regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, enable ? -1 : 0); - return len; + return 0; } -static struct counter_count_ext ti_eqep_position_ext[] = { - { - .name = "ceiling", - .read = ti_eqep_position_ceiling_read, - .write = ti_eqep_position_ceiling_write, - }, - { - .name = "floor", - .read = ti_eqep_position_floor_read, - .write = ti_eqep_position_floor_write, - }, - { - .name = "enable", - .read = ti_eqep_position_enable_read, - .write = ti_eqep_position_enable_write, - }, +static struct counter_comp ti_eqep_position_ext[] = { + COUNTER_COMP_CEILING(ti_eqep_position_ceiling_read, + ti_eqep_position_ceiling_write), + COUNTER_COMP_ENABLE(ti_eqep_position_enable_read, + ti_eqep_position_enable_write), }; static struct counter_signal ti_eqep_signals[] = { @@ -324,17 +315,17 @@ static struct counter_signal ti_eqep_signals[] = { }, }; -static const enum counter_count_function ti_eqep_position_functions[] = { - [TI_EQEP_COUNT_FUNC_QUAD_COUNT] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4, - [TI_EQEP_COUNT_FUNC_DIR_COUNT] = COUNTER_COUNT_FUNCTION_PULSE_DIRECTION, - [TI_EQEP_COUNT_FUNC_UP_COUNT] = COUNTER_COUNT_FUNCTION_INCREASE, - [TI_EQEP_COUNT_FUNC_DOWN_COUNT] = COUNTER_COUNT_FUNCTION_DECREASE, +static const enum counter_function ti_eqep_position_functions[] = { + COUNTER_FUNCTION_QUADRATURE_X4, + COUNTER_FUNCTION_PULSE_DIRECTION, + COUNTER_FUNCTION_INCREASE, + COUNTER_FUNCTION_DECREASE, }; static const enum counter_synapse_action ti_eqep_position_synapse_actions[] = { - [TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES, - [TI_EQEP_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE, - [TI_EQEP_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE, + COUNTER_SYNAPSE_ACTION_BOTH_EDGES, + COUNTER_SYNAPSE_ACTION_RISING_EDGE, + COUNTER_SYNAPSE_ACTION_NONE, }; static struct counter_synapse ti_eqep_position_synapses[] = { @@ -368,7 +359,7 @@ static const struct regmap_config ti_eqep_regmap32_config = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, - .max_register = 0x24, + .max_register = QUPRD, }; static const struct regmap_config ti_eqep_regmap16_config = { @@ -376,19 +367,21 @@ static const struct regmap_config ti_eqep_regmap16_config = { .reg_bits = 16, .val_bits = 16, .reg_stride = 2, - .max_register = 0x1e, + .max_register = QCPRDLAT, }; static int ti_eqep_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct counter_device *counter; struct ti_eqep_cnt *priv; void __iomem *base; int err; - priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); - if (!priv) + counter = devm_counter_alloc(dev, sizeof(*priv)); + if (!counter) return -ENOMEM; + priv = counter_priv(counter); base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(base)) @@ -404,16 +397,15 @@ static int ti_eqep_probe(struct platform_device *pdev) if (IS_ERR(priv->regmap16)) return PTR_ERR(priv->regmap16); - priv->counter.name = dev_name(dev); - priv->counter.parent = dev; - priv->counter.ops = &ti_eqep_counter_ops; - priv->counter.counts = ti_eqep_counts; - priv->counter.num_counts = ARRAY_SIZE(ti_eqep_counts); - priv->counter.signals = ti_eqep_signals; - priv->counter.num_signals = ARRAY_SIZE(ti_eqep_signals); - priv->counter.priv = priv; + counter->name = dev_name(dev); + counter->parent = dev; + counter->ops = &ti_eqep_counter_ops; + counter->counts = ti_eqep_counts; + counter->num_counts = ARRAY_SIZE(ti_eqep_counts); + counter->signals = ti_eqep_signals; + counter->num_signals = ARRAY_SIZE(ti_eqep_signals); - platform_set_drvdata(pdev, priv); + platform_set_drvdata(pdev, counter); /* * Need to make sure power is turned on. On AM33xx, this comes from the @@ -423,7 +415,7 @@ static int ti_eqep_probe(struct platform_device *pdev) pm_runtime_enable(dev); pm_runtime_get_sync(dev); - err = counter_register(&priv->counter); + err = counter_add(counter); if (err < 0) { pm_runtime_put_sync(dev); pm_runtime_disable(dev); @@ -435,11 +427,11 @@ static int ti_eqep_probe(struct platform_device *pdev) static int ti_eqep_remove(struct platform_device *pdev) { - struct ti_eqep_cnt *priv = platform_get_drvdata(pdev); + struct counter_device *counter = platform_get_drvdata(pdev); struct device *dev = &pdev->dev; - counter_unregister(&priv->counter); - pm_runtime_put_sync(dev), + counter_unregister(counter); + pm_runtime_put_sync(dev); pm_runtime_disable(dev); return 0; @@ -464,3 +456,4 @@ module_platform_driver(ti_eqep_driver); MODULE_AUTHOR("David Lechner <david@lechnology.com>"); MODULE_DESCRIPTION("TI eQEP counter driver"); MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(COUNTER); |