diff options
Diffstat (limited to 'drivers/gpio/gpio-etraxfs.c')
| -rw-r--r-- | drivers/gpio/gpio-etraxfs.c | 475 |
1 files changed, 0 insertions, 475 deletions
diff --git a/drivers/gpio/gpio-etraxfs.c b/drivers/gpio/gpio-etraxfs.c deleted file mode 100644 index 94db1bf4bfdb..000000000000 --- a/drivers/gpio/gpio-etraxfs.c +++ /dev/null @@ -1,475 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/gpio/driver.h> -#include <linux/of_gpio.h> -#include <linux/io.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> - -#define ETRAX_FS_rw_pa_dout 0 -#define ETRAX_FS_r_pa_din 4 -#define ETRAX_FS_rw_pa_oe 8 -#define ETRAX_FS_rw_intr_cfg 12 -#define ETRAX_FS_rw_intr_mask 16 -#define ETRAX_FS_rw_ack_intr 20 -#define ETRAX_FS_r_intr 24 -#define ETRAX_FS_r_masked_intr 28 -#define ETRAX_FS_rw_pb_dout 32 -#define ETRAX_FS_r_pb_din 36 -#define ETRAX_FS_rw_pb_oe 40 -#define ETRAX_FS_rw_pc_dout 48 -#define ETRAX_FS_r_pc_din 52 -#define ETRAX_FS_rw_pc_oe 56 -#define ETRAX_FS_rw_pd_dout 64 -#define ETRAX_FS_r_pd_din 68 -#define ETRAX_FS_rw_pd_oe 72 -#define ETRAX_FS_rw_pe_dout 80 -#define ETRAX_FS_r_pe_din 84 -#define ETRAX_FS_rw_pe_oe 88 - -#define ARTPEC3_r_pa_din 0 -#define ARTPEC3_rw_pa_dout 4 -#define ARTPEC3_rw_pa_oe 8 -#define ARTPEC3_r_pb_din 44 -#define ARTPEC3_rw_pb_dout 48 -#define ARTPEC3_rw_pb_oe 52 -#define ARTPEC3_r_pc_din 88 -#define ARTPEC3_rw_pc_dout 92 -#define ARTPEC3_rw_pc_oe 96 -#define ARTPEC3_r_pd_din 116 -#define ARTPEC3_rw_intr_cfg 120 -#define ARTPEC3_rw_intr_pins 124 -#define ARTPEC3_rw_intr_mask 128 -#define ARTPEC3_rw_ack_intr 132 -#define ARTPEC3_r_masked_intr 140 - -#define GIO_CFG_OFF 0 -#define GIO_CFG_HI 1 -#define GIO_CFG_LO 2 -#define GIO_CFG_SET 3 -#define GIO_CFG_POSEDGE 5 -#define GIO_CFG_NEGEDGE 6 -#define GIO_CFG_ANYEDGE 7 - -struct etraxfs_gpio_info; - -struct etraxfs_gpio_block { - raw_spinlock_t lock; - u32 mask; - u32 cfg; - u32 pins; - unsigned int group[8]; - - void __iomem *regs; - const struct etraxfs_gpio_info *info; -}; - -struct etraxfs_gpio_chip { - struct gpio_chip gc; - struct etraxfs_gpio_block *block; -}; - -struct etraxfs_gpio_port { - const char *label; - unsigned int oe; - unsigned int dout; - unsigned int din; - unsigned int ngpio; -}; - -struct etraxfs_gpio_info { - unsigned int num_ports; - const struct etraxfs_gpio_port *ports; - - unsigned int rw_ack_intr; - unsigned int rw_intr_mask; - unsigned int rw_intr_cfg; - unsigned int rw_intr_pins; - unsigned int r_masked_intr; -}; - -static const struct etraxfs_gpio_port etraxfs_gpio_etraxfs_ports[] = { - { - .label = "A", - .ngpio = 8, - .oe = ETRAX_FS_rw_pa_oe, - .dout = ETRAX_FS_rw_pa_dout, - .din = ETRAX_FS_r_pa_din, - }, - { - .label = "B", - .ngpio = 18, - .oe = ETRAX_FS_rw_pb_oe, - .dout = ETRAX_FS_rw_pb_dout, - .din = ETRAX_FS_r_pb_din, - }, - { - .label = "C", - .ngpio = 18, - .oe = ETRAX_FS_rw_pc_oe, - .dout = ETRAX_FS_rw_pc_dout, - .din = ETRAX_FS_r_pc_din, - }, - { - .label = "D", - .ngpio = 18, - .oe = ETRAX_FS_rw_pd_oe, - .dout = ETRAX_FS_rw_pd_dout, - .din = ETRAX_FS_r_pd_din, - }, - { - .label = "E", - .ngpio = 18, - .oe = ETRAX_FS_rw_pe_oe, - .dout = ETRAX_FS_rw_pe_dout, - .din = ETRAX_FS_r_pe_din, - }, -}; - -static const struct etraxfs_gpio_info etraxfs_gpio_etraxfs = { - .num_ports = ARRAY_SIZE(etraxfs_gpio_etraxfs_ports), - .ports = etraxfs_gpio_etraxfs_ports, - .rw_ack_intr = ETRAX_FS_rw_ack_intr, - .rw_intr_mask = ETRAX_FS_rw_intr_mask, - .rw_intr_cfg = ETRAX_FS_rw_intr_cfg, - .r_masked_intr = ETRAX_FS_r_masked_intr, -}; - -static const struct etraxfs_gpio_port etraxfs_gpio_artpec3_ports[] = { - { - .label = "A", - .ngpio = 32, - .oe = ARTPEC3_rw_pa_oe, - .dout = ARTPEC3_rw_pa_dout, - .din = ARTPEC3_r_pa_din, - }, - { - .label = "B", - .ngpio = 32, - .oe = ARTPEC3_rw_pb_oe, - .dout = ARTPEC3_rw_pb_dout, - .din = ARTPEC3_r_pb_din, - }, - { - .label = "C", - .ngpio = 16, - .oe = ARTPEC3_rw_pc_oe, - .dout = ARTPEC3_rw_pc_dout, - .din = ARTPEC3_r_pc_din, - }, - { - .label = "D", - .ngpio = 32, - .din = ARTPEC3_r_pd_din, - }, -}; - -static const struct etraxfs_gpio_info etraxfs_gpio_artpec3 = { - .num_ports = ARRAY_SIZE(etraxfs_gpio_artpec3_ports), - .ports = etraxfs_gpio_artpec3_ports, - .rw_ack_intr = ARTPEC3_rw_ack_intr, - .rw_intr_mask = ARTPEC3_rw_intr_mask, - .rw_intr_cfg = ARTPEC3_rw_intr_cfg, - .r_masked_intr = ARTPEC3_r_masked_intr, - .rw_intr_pins = ARTPEC3_rw_intr_pins, -}; - -static unsigned int etraxfs_gpio_chip_to_port(struct gpio_chip *gc) -{ - return gc->label[0] - 'A'; -} - -static int etraxfs_gpio_of_xlate(struct gpio_chip *gc, - const struct of_phandle_args *gpiospec, - u32 *flags) -{ - /* - * Port numbers are A to E, and the properties are integers, so we - * specify them as 0xA - 0xE. - */ - if (etraxfs_gpio_chip_to_port(gc) + 0xA != gpiospec->args[2]) - return -EINVAL; - - return of_gpio_simple_xlate(gc, gpiospec, flags); -} - -static const struct of_device_id etraxfs_gpio_of_table[] = { - { - .compatible = "axis,etraxfs-gio", - .data = &etraxfs_gpio_etraxfs, - }, - { - .compatible = "axis,artpec3-gio", - .data = &etraxfs_gpio_artpec3, - }, - {}, -}; - -static unsigned int etraxfs_gpio_to_group_irq(unsigned int gpio) -{ - return gpio % 8; -} - -static unsigned int etraxfs_gpio_to_group_pin(struct etraxfs_gpio_chip *chip, - unsigned int gpio) -{ - return 4 * etraxfs_gpio_chip_to_port(&chip->gc) + gpio / 8; -} - -static void etraxfs_gpio_irq_ack(struct irq_data *d) -{ - struct etraxfs_gpio_chip *chip = - gpiochip_get_data(irq_data_get_irq_chip_data(d)); - struct etraxfs_gpio_block *block = chip->block; - unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq); - - writel(BIT(grpirq), block->regs + block->info->rw_ack_intr); -} - -static void etraxfs_gpio_irq_mask(struct irq_data *d) -{ - struct etraxfs_gpio_chip *chip = - gpiochip_get_data(irq_data_get_irq_chip_data(d)); - struct etraxfs_gpio_block *block = chip->block; - unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq); - - raw_spin_lock(&block->lock); - block->mask &= ~BIT(grpirq); - writel(block->mask, block->regs + block->info->rw_intr_mask); - raw_spin_unlock(&block->lock); -} - -static void etraxfs_gpio_irq_unmask(struct irq_data *d) -{ - struct etraxfs_gpio_chip *chip = - gpiochip_get_data(irq_data_get_irq_chip_data(d)); - struct etraxfs_gpio_block *block = chip->block; - unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq); - - raw_spin_lock(&block->lock); - block->mask |= BIT(grpirq); - writel(block->mask, block->regs + block->info->rw_intr_mask); - raw_spin_unlock(&block->lock); -} - -static int etraxfs_gpio_irq_set_type(struct irq_data *d, u32 type) -{ - struct etraxfs_gpio_chip *chip = - gpiochip_get_data(irq_data_get_irq_chip_data(d)); - struct etraxfs_gpio_block *block = chip->block; - unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq); - u32 cfg; - - switch (type) { - case IRQ_TYPE_EDGE_RISING: - cfg = GIO_CFG_POSEDGE; - break; - case IRQ_TYPE_EDGE_FALLING: - cfg = GIO_CFG_NEGEDGE; - break; - case IRQ_TYPE_EDGE_BOTH: - cfg = GIO_CFG_ANYEDGE; - break; - case IRQ_TYPE_LEVEL_LOW: - cfg = GIO_CFG_LO; - break; - case IRQ_TYPE_LEVEL_HIGH: - cfg = GIO_CFG_HI; - break; - default: - return -EINVAL; - } - - raw_spin_lock(&block->lock); - block->cfg &= ~(0x7 << (grpirq * 3)); - block->cfg |= (cfg << (grpirq * 3)); - writel(block->cfg, block->regs + block->info->rw_intr_cfg); - raw_spin_unlock(&block->lock); - - return 0; -} - -static int etraxfs_gpio_irq_request_resources(struct irq_data *d) -{ - struct etraxfs_gpio_chip *chip = - gpiochip_get_data(irq_data_get_irq_chip_data(d)); - struct etraxfs_gpio_block *block = chip->block; - unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq); - int ret = -EBUSY; - - raw_spin_lock(&block->lock); - if (block->group[grpirq]) - goto out; - - ret = gpiochip_lock_as_irq(&chip->gc, d->hwirq); - if (ret) - goto out; - - block->group[grpirq] = d->irq; - if (block->info->rw_intr_pins) { - unsigned int pin = etraxfs_gpio_to_group_pin(chip, d->hwirq); - - block->pins &= ~(0xf << (grpirq * 4)); - block->pins |= (pin << (grpirq * 4)); - - writel(block->pins, block->regs + block->info->rw_intr_pins); - } - -out: - raw_spin_unlock(&block->lock); - return ret; -} - -static void etraxfs_gpio_irq_release_resources(struct irq_data *d) -{ - struct etraxfs_gpio_chip *chip = - gpiochip_get_data(irq_data_get_irq_chip_data(d)); - struct etraxfs_gpio_block *block = chip->block; - unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq); - - raw_spin_lock(&block->lock); - block->group[grpirq] = 0; - gpiochip_unlock_as_irq(&chip->gc, d->hwirq); - raw_spin_unlock(&block->lock); -} - -static struct irq_chip etraxfs_gpio_irq_chip = { - .name = "gpio-etraxfs", - .irq_ack = etraxfs_gpio_irq_ack, - .irq_mask = etraxfs_gpio_irq_mask, - .irq_unmask = etraxfs_gpio_irq_unmask, - .irq_set_type = etraxfs_gpio_irq_set_type, - .irq_request_resources = etraxfs_gpio_irq_request_resources, - .irq_release_resources = etraxfs_gpio_irq_release_resources, -}; - -static irqreturn_t etraxfs_gpio_interrupt(int irq, void *dev_id) -{ - struct etraxfs_gpio_block *block = dev_id; - unsigned long intr = readl(block->regs + block->info->r_masked_intr); - int bit; - - for_each_set_bit(bit, &intr, 8) - generic_handle_irq(block->group[bit]); - - return IRQ_RETVAL(intr & 0xff); -} - -static int etraxfs_gpio_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - const struct etraxfs_gpio_info *info; - const struct of_device_id *match; - struct etraxfs_gpio_block *block; - struct etraxfs_gpio_chip *chips; - struct resource *res, *irq; - bool allportsirq = false; - void __iomem *regs; - int ret; - int i; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - regs = devm_ioremap_resource(dev, res); - if (IS_ERR(regs)) - return PTR_ERR(regs); - - match = of_match_node(etraxfs_gpio_of_table, dev->of_node); - if (!match) - return -EINVAL; - - info = match->data; - - chips = devm_kzalloc(dev, sizeof(*chips) * info->num_ports, GFP_KERNEL); - if (!chips) - return -ENOMEM; - - irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!irq) - return -EINVAL; - - block = devm_kzalloc(dev, sizeof(*block), GFP_KERNEL); - if (!block) - return -ENOMEM; - - raw_spin_lock_init(&block->lock); - - block->regs = regs; - block->info = info; - - writel(0, block->regs + info->rw_intr_mask); - writel(0, block->regs + info->rw_intr_cfg); - if (info->rw_intr_pins) { - allportsirq = true; - writel(0, block->regs + info->rw_intr_pins); - } - - ret = devm_request_irq(dev, irq->start, etraxfs_gpio_interrupt, - IRQF_SHARED, dev_name(dev), block); - if (ret) { - dev_err(dev, "Unable to request irq %d\n", ret); - return ret; - } - - for (i = 0; i < info->num_ports; i++) { - struct etraxfs_gpio_chip *chip = &chips[i]; - struct gpio_chip *gc = &chip->gc; - const struct etraxfs_gpio_port *port = &info->ports[i]; - unsigned long flags = BGPIOF_READ_OUTPUT_REG_SET; - void __iomem *dat = regs + port->din; - void __iomem *set = regs + port->dout; - void __iomem *dirout = regs + port->oe; - - chip->block = block; - - if (dirout == set) { - dirout = set = NULL; - flags = BGPIOF_NO_OUTPUT; - } - - ret = bgpio_init(gc, dev, 4, - dat, set, NULL, dirout, NULL, - flags); - if (ret) { - dev_err(dev, "Unable to init port %s\n", - port->label); - continue; - } - - gc->ngpio = port->ngpio; - gc->label = port->label; - - gc->of_node = dev->of_node; - gc->of_gpio_n_cells = 3; - gc->of_xlate = etraxfs_gpio_of_xlate; - - ret = gpiochip_add_data(gc, chip); - if (ret) { - dev_err(dev, "Unable to register port %s\n", - gc->label); - continue; - } - - if (i > 0 && !allportsirq) - continue; - - ret = gpiochip_irqchip_add(gc, &etraxfs_gpio_irq_chip, 0, - handle_level_irq, IRQ_TYPE_NONE); - if (ret) { - dev_err(dev, "Unable to add irqchip to port %s\n", - gc->label); - } - } - - return 0; -} - -static struct platform_driver etraxfs_gpio_driver = { - .driver = { - .name = "etraxfs-gpio", - .of_match_table = of_match_ptr(etraxfs_gpio_of_table), - }, - .probe = etraxfs_gpio_probe, -}; - -builtin_platform_driver(etraxfs_gpio_driver); |