diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/das1800.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/das1800.c | 1758 |
1 files changed, 1758 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c new file mode 100644 index 000000000000..cd4cd4e6a79b --- /dev/null +++ b/drivers/staging/comedi/drivers/das1800.c @@ -0,0 +1,1758 @@ +/* + comedi/drivers/das1800.c + Driver for Keitley das1700/das1800 series boards + Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net> + + COMEDI - Linux Control and Measurement Device Interface + Copyright (C) 2000 David A. Schleef <ds@schleef.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +************************************************************************ +*/ +/* +Driver: das1800 +Description: Keithley Metrabyte DAS1800 (& compatibles) +Author: Frank Mori Hess <fmhess@users.sourceforge.net> +Devices: [Keithley Metrabyte] DAS-1701ST (das-1701st), + DAS-1701ST-DA (das-1701st-da), DAS-1701/AO (das-1701ao), + DAS-1702ST (das-1702st), DAS-1702ST-DA (das-1702st-da), + DAS-1702HR (das-1702hr), DAS-1702HR-DA (das-1702hr-da), + DAS-1702/AO (das-1702ao), DAS-1801ST (das-1801st), + DAS-1801ST-DA (das-1801st-da), DAS-1801HC (das-1801hc), + DAS-1801AO (das-1801ao), DAS-1802ST (das-1802st), + DAS-1802ST-DA (das-1802st-da), DAS-1802HR (das-1802hr), + DAS-1802HR-DA (das-1802hr-da), DAS-1802HC (das-1802hc), + DAS-1802AO (das-1802ao) +Status: works + +The waveform analog output on the 'ao' cards is not supported. +If you need it, send me (Frank Hess) an email. + +Configuration options: + [0] - I/O port base address + [1] - IRQ (optional, required for timed or externally triggered conversions) + [2] - DMA0 (optional, requires irq) + [3] - DMA1 (optional, requires irq and dma0) +*/ +/* + +This driver supports the following Keithley boards: + +das-1701st +das-1701st-da +das-1701ao +das-1702st +das-1702st-da +das-1702hr +das-1702hr-da +das-1702ao +das-1801st +das-1801st-da +das-1801hc +das-1801ao +das-1802st +das-1802st-da +das-1802hr +das-1802hr-da +das-1802hc +das-1802ao + +Options: + [0] - base io address + [1] - irq (optional, required for timed or externally triggered conversions) + [2] - dma0 (optional, requires irq) + [3] - dma1 (optional, requires irq and dma0) + +irq can be omitted, although the cmd interface will not work without it. + +analog input cmd triggers supported: + start_src: TRIG_NOW | TRIG_EXT + scan_begin_src: TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT + scan_end_src: TRIG_COUNT + convert_src: TRIG_TIMER | TRIG_EXT (TRIG_EXT requires scan_begin_src == TRIG_FOLLOW) + stop_src: TRIG_COUNT | TRIG_EXT | TRIG_NONE + +scan_begin_src triggers TRIG_TIMER and TRIG_EXT use the card's +'burst mode' which limits the valid conversion time to 64 microseconds +(convert_arg <= 64000). This limitation does not apply if scan_begin_src +is TRIG_FOLLOW. + +NOTES: +Only the DAS-1801ST has been tested by me. +Unipolar and bipolar ranges cannot be mixed in the channel/gain list. + +TODO: + Make it automatically allocate irq and dma channels if they are not specified + Add support for analog out on 'ao' cards + read insn for analog out +*/ + +#include "../comedidev.h" + +#include <linux/ioport.h> +#include <asm/dma.h> + +#include "8253.h" +#include "comedi_fc.h" + +// misc. defines +#define DAS1800_SIZE 16 //uses 16 io addresses +#define FIFO_SIZE 1024 // 1024 sample fifo +#define TIMER_BASE 200 // 5 Mhz master clock +#define UNIPOLAR 0x4 // bit that determines whether input range is uni/bipolar +#define DMA_BUF_SIZE 0x1ff00 // size in bytes of dma buffers + +/* Registers for the das1800 */ +#define DAS1800_FIFO 0x0 +#define DAS1800_QRAM 0x0 +#define DAS1800_DAC 0x0 +#define DAS1800_SELECT 0x2 +#define ADC 0x0 +#define QRAM 0x1 +#define DAC(a) (0x2 + a) +#define DAS1800_DIGITAL 0x3 +#define DAS1800_CONTROL_A 0x4 +#define FFEN 0x1 +#define CGEN 0x4 +#define CGSL 0x8 +#define TGEN 0x10 +#define TGSL 0x20 +#define ATEN 0x80 +#define DAS1800_CONTROL_B 0x5 +#define DMA_CH5 0x1 +#define DMA_CH6 0x2 +#define DMA_CH7 0x3 +#define DMA_CH5_CH6 0x5 +#define DMA_CH6_CH7 0x6 +#define DMA_CH7_CH5 0x7 +#define DMA_ENABLED 0x3 //mask used to determine if dma is enabled +#define DMA_DUAL 0x4 +#define IRQ3 0x8 +#define IRQ5 0x10 +#define IRQ7 0x18 +#define IRQ10 0x28 +#define IRQ11 0x30 +#define IRQ15 0x38 +#define FIMD 0x40 +#define DAS1800_CONTROL_C 0X6 +#define IPCLK 0x1 +#define XPCLK 0x3 +#define BMDE 0x4 +#define CMEN 0x8 +#define UQEN 0x10 +#define SD 0x40 +#define UB 0x80 +#define DAS1800_STATUS 0x7 +// bits that prevent interrupt status bits (and CVEN) from being cleared on write +#define CLEAR_INTR_MASK (CVEN_MASK | 0x1f) +#define INT 0x1 +#define DMATC 0x2 +#define CT0TC 0x8 +#define OVF 0x10 +#define FHF 0x20 +#define FNE 0x40 +#define CVEN_MASK 0x40 // masks CVEN on write +#define CVEN 0x80 +#define DAS1800_BURST_LENGTH 0x8 +#define DAS1800_BURST_RATE 0x9 +#define DAS1800_QRAM_ADDRESS 0xa +#define DAS1800_COUNTER 0xc + +#define IOBASE2 0x400 //offset of additional ioports used on 'ao' cards + +enum { + das1701st, das1701st_da, das1702st, das1702st_da, das1702hr, + das1702hr_da, + das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da, + das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao +}; + +static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig * it); +static int das1800_detach(struct comedi_device * dev); +static int das1800_probe(struct comedi_device * dev); +static int das1800_cancel(struct comedi_device * dev, struct comedi_subdevice * s); +static irqreturn_t das1800_interrupt(int irq, void *d PT_REGS_ARG); +static int das1800_ai_poll(struct comedi_device * dev, struct comedi_subdevice * s); +static void das1800_ai_handler(struct comedi_device * dev); +static void das1800_handle_dma(struct comedi_device * dev, struct comedi_subdevice * s, + unsigned int status); +static void das1800_flush_dma(struct comedi_device * dev, struct comedi_subdevice * s); +static void das1800_flush_dma_channel(struct comedi_device * dev, struct comedi_subdevice * s, + unsigned int channel, uint16_t * buffer); +static void das1800_handle_fifo_half_full(struct comedi_device * dev, + struct comedi_subdevice * s); +static void das1800_handle_fifo_not_empty(struct comedi_device * dev, + struct comedi_subdevice * s); +static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_cmd * cmd); +static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice * s); +static int das1800_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data); +static int das1800_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data); +static int das1800_di_rbits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data); +static int das1800_do_wbits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data); + +static int das1800_set_frequency(struct comedi_device * dev); +static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode); +static unsigned int suggest_transfer_size(struct comedi_cmd * cmd); + +// analog input ranges +static const struct comedi_lrange range_ai_das1801 = { + 8, + { + RANGE(-5, 5), + RANGE(-1, 1), + RANGE(-0.1, 0.1), + RANGE(-0.02, 0.02), + RANGE(0, 5), + RANGE(0, 1), + RANGE(0, 0.1), + RANGE(0, 0.02), + } +}; + +static const struct comedi_lrange range_ai_das1802 = { + 8, + { + RANGE(-10, 10), + RANGE(-5, 5), + RANGE(-2.5, 2.5), + RANGE(-1.25, 1.25), + RANGE(0, 10), + RANGE(0, 5), + RANGE(0, 2.5), + RANGE(0, 1.25), + } +}; + +struct das1800_board { + const char *name; + int ai_speed; /* max conversion period in nanoseconds */ + int resolution; /* bits of ai resolution */ + int qram_len; /* length of card's channel / gain queue */ + int common; /* supports AREF_COMMON flag */ + int do_n_chan; /* number of digital output channels */ + int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */ + int ao_n_chan; /* number of analog out channels */ + const struct comedi_lrange *range_ai; /* available input ranges */ +}; + +/* Warning: the maximum conversion speeds listed below are + * not always achievable depending on board setup (see + * user manual.) + */ +static const struct das1800_board das1800_boards[] = { + { + name: "das-1701st", + ai_speed:6250, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:0, + ao_n_chan:0, + range_ai:&range_ai_das1801, + }, + { + name: "das-1701st-da", + ai_speed:6250, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:1, + ao_n_chan:4, + range_ai:&range_ai_das1801, + }, + { + name: "das-1702st", + ai_speed:6250, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:0, + ao_n_chan:0, + range_ai:&range_ai_das1802, + }, + { + name: "das-1702st-da", + ai_speed:6250, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:1, + ao_n_chan:4, + range_ai:&range_ai_das1802, + }, + { + name: "das-1702hr", + ai_speed:20000, + resolution:16, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:0, + ao_n_chan:0, + range_ai:&range_ai_das1802, + }, + { + name: "das-1702hr-da", + ai_speed:20000, + resolution:16, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:1, + ao_n_chan:2, + range_ai:&range_ai_das1802, + }, + { + name: "das-1701ao", + ai_speed:6250, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:2, + ao_n_chan:2, + range_ai:&range_ai_das1801, + }, + { + name: "das-1702ao", + ai_speed:6250, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:2, + ao_n_chan:2, + range_ai:&range_ai_das1802, + }, + { + name: "das-1801st", + ai_speed:3000, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:0, + ao_n_chan:0, + range_ai:&range_ai_das1801, + }, + { + name: "das-1801st-da", + ai_speed:3000, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:0, + ao_n_chan:4, + range_ai:&range_ai_das1801, + }, + { + name: "das-1802st", + ai_speed:3000, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:0, + ao_n_chan:0, + range_ai:&range_ai_das1802, + }, + { + name: "das-1802st-da", + ai_speed:3000, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:1, + ao_n_chan:4, + range_ai:&range_ai_das1802, + }, + { + name: "das-1802hr", + ai_speed:10000, + resolution:16, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:0, + ao_n_chan:0, + range_ai:&range_ai_das1802, + }, + { + name: "das-1802hr-da", + ai_speed:10000, + resolution:16, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:1, + ao_n_chan:2, + range_ai:&range_ai_das1802, + }, + { + name: "das-1801hc", + ai_speed:3000, + resolution:12, + qram_len:64, + common: 0, + do_n_chan:8, + ao_ability:1, + ao_n_chan:2, + range_ai:&range_ai_das1801, + }, + { + name: "das-1802hc", + ai_speed:3000, + resolution:12, + qram_len:64, + common: 0, + do_n_chan:8, + ao_ability:1, + ao_n_chan:2, + range_ai:&range_ai_das1802, + }, + { + name: "das-1801ao", + ai_speed:3000, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:2, + ao_n_chan:2, + range_ai:&range_ai_das1801, + }, + { + name: "das-1802ao", + ai_speed:3000, + resolution:12, + qram_len:256, + common: 1, + do_n_chan:4, + ao_ability:2, + ao_n_chan:2, + range_ai:&range_ai_das1802, + }, +}; + +/* + * Useful for shorthand access to the particular board structure + */ +#define thisboard ((const struct das1800_board *)dev->board_ptr) + +struct das1800_private { + volatile unsigned int count; /* number of data points left to be taken */ + unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */ + unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */ + int do_bits; /* digital output bits */ + int irq_dma_bits; /* bits for control register b */ + /* dma bits for control register b, stored so that dma can be + * turned on and off */ + int dma_bits; + unsigned int dma0; /* dma channels used */ + unsigned int dma1; + volatile unsigned int dma_current; /* dma channel currently in use */ + uint16_t *ai_buf0; /* pointers to dma buffers */ + uint16_t *ai_buf1; + uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */ + unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */ + unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */ + short ao_update_bits; /* remembers the last write to the 'update' dac */ +}; + +#define devpriv ((struct das1800_private *)dev->private) + +// analog out range for boards with basic analog out +static const struct comedi_lrange range_ao_1 = { + 1, + { + RANGE(-10, 10), + } +}; + +// analog out range for 'ao' boards +/* +static const struct comedi_lrange range_ao_2 = { + 2, + { + RANGE(-10, 10), + RANGE(-5, 5), + } +}; +*/ + +static struct comedi_driver driver_das1800 = { + driver_name:"das1800", + module:THIS_MODULE, + attach:das1800_attach, + detach:das1800_detach, + num_names:sizeof(das1800_boards) / sizeof(struct das1800_board), + board_name:&das1800_boards[0].name, + offset:sizeof(struct das1800_board), +}; + +/* + * A convenient macro that defines init_module() and cleanup_module(), + * as necessary. + */ +COMEDI_INITCLEANUP(driver_das1800); + +static int das1800_init_dma(struct comedi_device * dev, unsigned int dma0, + unsigned int dma1) +{ + unsigned long flags; + + // need an irq to do dma + if (dev->irq && dma0) { + //encode dma0 and dma1 into 2 digit hexadecimal for switch + switch ((dma0 & 0x7) | (dma1 << 4)) { + case 0x5: // dma0 == 5 + devpriv->dma_bits |= DMA_CH5; + break; + case 0x6: // dma0 == 6 + devpriv->dma_bits |= DMA_CH6; + break; + case 0x7: // dma0 == 7 + devpriv->dma_bits |= DMA_CH7; + break; + case 0x65: // dma0 == 5, dma1 == 6 + devpriv->dma_bits |= DMA_CH5_CH6; + break; + case 0x76: // dma0 == 6, dma1 == 7 + devpriv->dma_bits |= DMA_CH6_CH7; + break; + case 0x57: // dma0 == 7, dma1 == 5 + devpriv->dma_bits |= DMA_CH7_CH5; + break; + default: + printk(" only supports dma channels 5 through 7\n" + " Dual dma only allows the following combinations:\n" + " dma 5,6 / 6,7 / or 7,5\n"); + return -EINVAL; + break; + } + if (request_dma(dma0, driver_das1800.driver_name)) { + printk(" failed to allocate dma channel %i\n", dma0); + return -EINVAL; + } + devpriv->dma0 = dma0; + devpriv->dma_current = dma0; + if (dma1) { + if (request_dma(dma1, driver_das1800.driver_name)) { + printk(" failed to allocate dma channel %i\n", + dma1); + return -EINVAL; + } + devpriv->dma1 = dma1; + } + devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA); + if (devpriv->ai_buf0 == NULL) + return -ENOMEM; + devpriv->dma_current_buf = devpriv->ai_buf0; + if (dma1) { + devpriv->ai_buf1 = + kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA); + if (devpriv->ai_buf1 == NULL) + return -ENOMEM; + } + flags = claim_dma_lock(); + disable_dma(devpriv->dma0); + set_dma_mode(devpriv->dma0, DMA_MODE_READ); + if (dma1) { + disable_dma(devpriv->dma1); + set_dma_mode(devpriv->dma1, DMA_MODE_READ); + } + release_dma_lock(flags); + } + return 0; +} + +static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig * it) +{ + struct comedi_subdevice *s; + unsigned long iobase = it->options[0]; + unsigned int irq = it->options[1]; + unsigned int dma0 = it->options[2]; + unsigned int dma1 = it->options[3]; + unsigned long iobase2; + int board; + int retval; + + /* allocate and initialize dev->private */ + if (alloc_private(dev, sizeof(struct das1800_private)) < 0) + return -ENOMEM; + + printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name, + iobase); + if (irq) { + printk(", irq %u", irq); + if (dma0) { + printk(", dma %u", dma0); + if (dma1) + printk(" and %u", dma1); + } + } + printk("\n"); + + if (iobase == 0) { + printk(" io base address required\n"); + return -EINVAL; + } + + /* check if io addresses are available */ + if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) { + printk(" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", iobase, iobase + DAS1800_SIZE - 1); + return -EIO; + } + dev->iobase = iobase; + + board = das1800_probe(dev); + if (board < 0) { + printk(" unable to determine board type\n"); + return -ENODEV; + } + + dev->board_ptr = das1800_boards + board; + dev->board_name = thisboard->name; + + // if it is an 'ao' board with fancy analog out then we need extra io ports + if (thisboard->ao_ability == 2) { + iobase2 = iobase + IOBASE2; + if (!request_region(iobase2, DAS1800_SIZE, + driver_das1800.driver_name)) { + printk(" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", iobase2, iobase2 + DAS1800_SIZE - 1); + return -EIO; + } + devpriv->iobase2 = iobase2; + } + + /* grab our IRQ */ + if (irq) { + if (comedi_request_irq(irq, das1800_interrupt, 0, + driver_das1800.driver_name, dev)) { + printk(" unable to allocate irq %u\n", irq); + return -EINVAL; + } + } + dev->irq = irq; + + // set bits that tell card which irq to use + switch (irq) { + case 0: + break; + case 3: + devpriv->irq_dma_bits |= 0x8; + break; + case 5: + devpriv->irq_dma_bits |= 0x10; + break; + case 7: + devpriv->irq_dma_bits |= 0x18; + break; + case 10: + devpriv->irq_dma_bits |= 0x28; + break; + case 11: + devpriv->irq_dma_bits |= 0x30; + break; + case 15: + devpriv->irq_dma_bits |= 0x38; + break; + default: + printk(" irq out of range\n"); + return -EINVAL; + break; + } + + retval = das1800_init_dma(dev, dma0, dma1); + if (retval < 0) + return retval; + + if (devpriv->ai_buf0 == NULL) { + devpriv->ai_buf0 = + kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL); + if (devpriv->ai_buf0 == NULL) + return -ENOMEM; + } + + if (alloc_subdevices(dev, 4) < 0) + return -ENOMEM; + + /* analog input subdevice */ + s = dev->subdevices + 0; + dev->read_subdev = s; + s->type = COMEDI_SUBD_AI; + s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ; + if (thisboard->common) + s->subdev_flags |= SDF_COMMON; + s->n_chan = thisboard->qram_len; + s->len_chanlist = thisboard->qram_len; + s->maxdata = (1 << thisboard->resolution) - 1; + s->range_table = thisboard->range_ai; + s->do_cmd = das1800_ai_do_cmd; + s->do_cmdtest = das1800_ai_do_cmdtest; + s->insn_read = das1800_ai_rinsn; + s->poll = das1800_ai_poll; + s->cancel = das1800_cancel; + + /* analog out */ + s = dev->subdevices + 1; + if (thisboard->ao_ability == 1) { + s->type = COMEDI_SUBD_AO; + s->subdev_flags = SDF_WRITABLE; + s->n_chan = thisboard->ao_n_chan; + s->maxdata = (1 << thisboard->resolution) - 1; + s->range_table = &range_ao_1; + s->insn_write = das1800_ao_winsn; + } else { + s->type = COMEDI_SUBD_UNUSED; + } + + /* di */ + s = dev->subdevices + 2; + s->type = COMEDI_SUBD_DI; + s->subdev_flags = SDF_READABLE; + s->n_chan = 4; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = das1800_di_rbits; + + /* do */ + s = dev->subdevices + 3; + s->type = COMEDI_SUBD_DO; + s->subdev_flags = SDF_WRITABLE | SDF_READABLE; + s->n_chan = thisboard->do_n_chan; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = das1800_do_wbits; + + das1800_cancel(dev, dev->read_subdev); + + // initialize digital out channels + outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); + + // initialize analog out channels + if (thisboard->ao_ability == 1) { + // select 'update' dac channel for baseAddress + 0x0 + outb(DAC(thisboard->ao_n_chan - 1), + dev->iobase + DAS1800_SELECT); + outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); + } + + return 0; +}; + +static int das1800_detach(struct comedi_device * dev) +{ + /* only free stuff if it has been allocated by _attach */ + if (dev->iobase) + release_region(dev->iobase, DAS1800_SIZE); + if (dev->irq) + comedi_free_irq(dev->irq, dev); + if (dev->private) { + if (devpriv->iobase2) + release_region(devpriv->iobase2, DAS1800_SIZE); + if (devpriv->dma0) + free_dma(devpriv->dma0); + if (devpriv->dma1) + free_dma(devpriv->dma1); + if (devpriv->ai_buf0) + kfree(devpriv->ai_buf0); + if (devpriv->ai_buf1) + kfree(devpriv->ai_buf1); + } + + printk("comedi%d: %s: remove\n", dev->minor, + driver_das1800.driver_name); + + return 0; +}; + +/* probes and checks das-1800 series board type + */ +static int das1800_probe(struct comedi_device * dev) +{ + int id; + int board; + + id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */ + board = ((struct das1800_board *) dev->board_ptr) - das1800_boards; + + switch (id) { + case 0x3: + if (board == das1801st_da || board == das1802st_da || + board == das1701st_da || board == das1702st_da) { + printk(" Board model: %s\n", + das1800_boards[board].name); + return board; + } + printk(" Board model (probed, not recommended): das-1800st-da series\n"); + return das1801st; + break; + case 0x4: + if (board == das1802hr_da || board == das1702hr_da) { + printk(" Board model: %s\n", + das1800_boards[board].name); + return board; + } + printk(" Board model (probed, not recommended): das-1802hr-da\n"); + return das1802hr; + break; + case 0x5: + if (board == das1801ao || board == das1802ao || + board == das1701ao || board == das1702ao) { + printk(" Board model: %s\n", + das1800_boards[board].name); + return board; + } + printk(" Board model (probed, not recommended): das-1800ao series\n"); + return das1801ao; + break; + case 0x6: + if (board == das1802hr || board == das1702hr) { + printk(" Board model: %s\n", + das1800_boards[board].name); + return board; + } + printk(" Board model (probed, not recommended): das-1802hr\n"); + return das1802hr; + break; + case 0x7: + if (board == das1801st || board == das1802st || + board == das1701st || board == das1702st) { + printk(" Board model: %s\n", + das1800_boards[board].name); + return board; + } + printk(" Board model (probed, not recommended): das-1800st series\n"); + return das1801st; + break; + case 0x8: + if (board == das1801hc || board == das1802hc) { + printk(" Board model: %s\n", + das1800_boards[board].name); + return board; + } + printk(" Board model (probed, not recommended): das-1800hc series\n"); + return das1801hc; + break; + default: + printk(" Board model: probe returned 0x%x (unknown, please report)\n", id); + return board; + break; + } + return -1; +} + +static int das1800_ai_poll(struct comedi_device * dev, struct comedi_subdevice * s) +{ + unsigned long flags; + + // prevent race with interrupt handler + comedi_spin_lock_irqsave(&dev->spinlock, flags); + das1800_ai_handler(dev); + comedi_spin_unlock_irqrestore(&dev->spinlock, flags); + + return s->async->buf_write_count - s->async->buf_read_count; +} + +static irqreturn_t das1800_interrupt(int irq, void *d PT_REGS_ARG) +{ + struct comedi_device *dev = d; + unsigned int status; + + if (dev->attached == 0) { + comedi_error(dev, "premature interrupt"); + return IRQ_HANDLED; + } + + /* Prevent race with das1800_ai_poll() on multi processor systems. + * Also protects indirect addressing in das1800_ai_handler */ + spin_lock(&dev->spinlock); + status = inb(dev->iobase + DAS1800_STATUS); + + /* if interrupt was not caused by das-1800 */ + if (!(status & INT)) { + spin_unlock(&dev->spinlock); + return IRQ_NONE; + } + /* clear the interrupt status bit INT */ + outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS); + // handle interrupt + das1800_ai_handler(dev); + + spin_unlock(&dev->spinlock); + return IRQ_HANDLED; +} + +// the guts of the interrupt handler, that is shared with das1800_ai_poll +static void das1800_ai_handler(struct comedi_device * dev) +{ + struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */ + struct comedi_async *async = s->async; + struct comedi_cmd *cmd = &async->cmd; + unsigned int status = inb(dev->iobase + DAS1800_STATUS); + + async->events = 0; + // select adc for base address + 0 + outb(ADC, dev->iobase + DAS1800_SELECT); + // dma buffer full + if (devpriv->irq_dma_bits & DMA_ENABLED) { + // look for data from dma transfer even if dma terminal count hasn't happened yet + das1800_handle_dma(dev, s, status); + } else if (status & FHF) { // if fifo half full + das1800_handle_fifo_half_full(dev, s); + } else if (status & FNE) { // if fifo not empty + das1800_handle_fifo_not_empty(dev, s); + } + + async->events |= COMEDI_CB_BLOCK; + /* if the card's fifo has overflowed */ + if (status & OVF) { + // clear OVF interrupt bit + outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS); + comedi_error(dev, "DAS1800 FIFO overflow"); + das1800_cancel(dev, s); + async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; + comedi_event(dev, s); + return; + } + // stop taking data if appropriate + /* stop_src TRIG_EXT */ + if (status & CT0TC) { + // clear CT0TC interrupt bit + outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS); + // make sure we get all remaining data from board before quitting + if (devpriv->irq_dma_bits & DMA_ENABLED) + das1800_flush_dma(dev, s); + else + das1800_handle_fifo_not_empty(dev, s); + das1800_cancel(dev, s); /* disable hardware conversions */ + async->events |= COMEDI_CB_EOA; + } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { // stop_src TRIG_COUNT + das1800_cancel(dev, s); /* disable hardware conversions */ + async->events |= COMEDI_CB_EOA; + } + + comedi_event(dev, s); + + return; +} + +static void das1800_handle_dma(struct comedi_device * dev, struct comedi_subdevice * s, + unsigned int status) +{ + unsigned long flags; + const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; + + flags = claim_dma_lock(); + das1800_flush_dma_channel(dev, s, devpriv->dma_current, + devpriv->dma_current_buf); + // re-enable dma channel + set_dma_addr(devpriv->dma_current, + virt_to_bus(devpriv->dma_current_buf)); + set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size); + enable_dma(devpriv->dma_current); + release_dma_lock(flags); + + if (status & DMATC) { + // clear DMATC interrupt bit + outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS); + // switch dma channels for next time, if appropriate + if (dual_dma) { + // read data from the other channel next time + if (devpriv->dma_current == devpriv->dma0) { + devpriv->dma_current = devpriv->dma1; + devpriv->dma_current_buf = devpriv->ai_buf1; + } else { + devpriv->dma_current = devpriv->dma0; + devpriv->dma_current_buf = devpriv->ai_buf0; + } + } + } + + return; +} + +static inline uint16_t munge_bipolar_sample(const struct comedi_device * dev, + uint16_t sample) +{ + sample += 1 << (thisboard->resolution - 1); + return sample; +} + +static void munge_data(struct comedi_device * dev, uint16_t * array, + unsigned int num_elements) +{ + unsigned int i; + int unipolar; + + /* see if card is using a unipolar or bipolar range so we can munge data correctly */ + unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; + + /* convert to unsigned type if we are in a bipolar mode */ + if (!unipolar) { + for (i = 0; i < num_elements; i++) { + array[i] = munge_bipolar_sample(dev, array[i]); + } + } +} + +/* Utility function used by das1800_flush_dma() and das1800_handle_dma(). + * Assumes dma lock is held */ +static void das1800_flush_dma_channel(struct comedi_device * dev, struct comedi_subdevice * s, + unsigned int channel, uint16_t * buffer) +{ + unsigned int num_bytes, num_samples; + struct comedi_cmd *cmd = &s->async->cmd; + + disable_dma(channel); + + /* clear flip-flop to make sure 2-byte registers + * get set correctly */ + clear_dma_ff(channel); + + // figure out how many points to read + num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel); + num_samples = num_bytes / sizeof(short); + + /* if we only need some of the points */ + if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples) + num_samples = devpriv->count; + + munge_data(dev, buffer, num_samples); + cfc_write_array_to_buffer(s, buffer, num_bytes); + if (s->async->cmd.stop_src == TRIG_COUNT) + devpriv->count -= num_samples; + + return; +} + +/* flushes remaining data from board when external trigger has stopped aquisition + * and we are using dma transfers */ +static void das1800_flush_dma(struct comedi_device * dev, struct comedi_subdevice * s) +{ + unsigned long flags; + const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; + + flags = claim_dma_lock(); + das1800_flush_dma_channel(dev, s, devpriv->dma_current, + devpriv->dma_current_buf); + + if (dual_dma) { + // switch to other channel and flush it + if (devpriv->dma_current == devpriv->dma0) { + devpriv->dma_current = devpriv->dma1; + devpriv->dma_current_buf = devpriv->ai_buf1; + } else { + devpriv->dma_current = devpriv->dma0; + devpriv->dma_current_buf = devpriv->ai_buf0; + } + das1800_flush_dma_channel(dev, s, devpriv->dma_current, + devpriv->dma_current_buf); + } + + release_dma_lock(flags); + + // get any remaining samples in fifo + das1800_handle_fifo_not_empty(dev, s); + + return; +} + +static void das1800_handle_fifo_half_full(struct comedi_device * dev, + struct comedi_subdevice * s) +{ + int numPoints = 0; /* number of points to read */ + struct comedi_cmd *cmd = &s->async->cmd; + + numPoints = FIFO_SIZE / 2; + /* if we only need some of the points */ + if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints) + numPoints = devpriv->count; + insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints); + munge_data(dev, devpriv->ai_buf0, numPoints); + cfc_write_array_to_buffer(s, devpriv->ai_buf0, + numPoints * sizeof(devpriv->ai_buf0[0])); + if (cmd->stop_src == TRIG_COUNT) + devpriv->count -= numPoints; + return; +} + +static void das1800_handle_fifo_not_empty(struct comedi_device * dev, + struct comedi_subdevice * s) +{ + short dpnt; + int unipolar; + struct comedi_cmd *cmd = &s->async->cmd; + + unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; + + while (inb(dev->iobase + DAS1800_STATUS) & FNE) { + if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) + break; + dpnt = inw(dev->iobase + DAS1800_FIFO); + /* convert to unsigned type if we are in a bipolar mode */ + if (!unipolar) ; + dpnt = munge_bipolar_sample(dev, dpnt); + cfc_write_to_buffer(s, dpnt); + if (cmd->stop_src == TRIG_COUNT) + devpriv->count--; + } + + return; +} + +static int das1800_cancel(struct comedi_device * dev, struct comedi_subdevice * s) +{ + outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */ + outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */ + outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */ + if (devpriv->dma0) + disable_dma(devpriv->dma0); + if (devpriv->dma1) + disable_dma(devpriv->dma1); + return 0; +} + +/* test analog input cmd */ +static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_cmd * cmd) +{ + int err = 0; + int tmp; + unsigned int tmp_arg; + int i; + int unipolar; + + /* step 1: make sure trigger sources are trivially valid */ + + tmp = cmd->start_src; + cmd->start_src &= TRIG_NOW | TRIG_EXT; + if (!cmd->start_src || tmp != cmd->start_src) + err++; + + tmp = cmd->scan_begin_src; + cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT; + if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) + err++; + + tmp = cmd->convert_src; + cmd->convert_src &= TRIG_TIMER | TRIG_EXT; + if (!cmd->convert_src || tmp != cmd->convert_src) + err++; + + tmp = cmd->scan_end_src; + cmd->scan_end_src &= TRIG_COUNT; + if (!cmd->scan_end_src || tmp != cmd->scan_end_src) + err++; + + tmp = cmd->stop_src; + cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE; + if (!cmd->stop_src || tmp != cmd->stop_src) + err++; + + if (err) + return 1; + + /* step 2: make sure trigger sources are unique and mutually compatible */ + + // uniqueness check + if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT) + err++; + if (cmd->scan_begin_src != TRIG_FOLLOW && + cmd->scan_begin_src != TRIG_TIMER && + cmd->scan_begin_src != TRIG_EXT) + err++; + if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT) + err++; + if (cmd->stop_src != TRIG_COUNT && + cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT) + err++; + //compatibility check + if (cmd->scan_begin_src != TRIG_FOLLOW && + cmd->convert_src != TRIG_TIMER) + err++; + + if (err) + return 2; + + /* step 3: make sure arguments are trivially compatible */ + + if (cmd->start_arg != 0) { + cmd->start_arg = 0; + err++; + } + if (cmd->convert_src == TRIG_TIMER) { + if (cmd->convert_arg < thisboard->ai_speed) { + cmd->convert_arg = thisboard->ai_speed; + err++; + } + } + if (!cmd->chanlist_len) { + cmd->chanlist_len = 1; + err++; + } + if (cmd->scan_end_arg != cmd->chanlist_len) { + cmd->scan_end_arg = cmd->chanlist_len; + err++; + } + + switch (cmd->stop_src) { + case TRIG_COUNT: + if (!cmd->stop_arg) { + cmd->stop_arg = 1; + err++; + } + break; + case TRIG_NONE: + if (cmd->stop_arg != 0) { + cmd->stop_arg = 0; + err++; + } + break; + default: + break; + } + + if (err) + return 3; + + /* step 4: fix up any arguments */ + + if (cmd->convert_src == TRIG_TIMER) { + // if we are not in burst mode + if (cmd->scan_begin_src == TRIG_FOLLOW) { + tmp_arg = cmd->convert_arg; + /* calculate counter values that give desired timing */ + i8253_cascade_ns_to_timer_2div(TIMER_BASE, + &(devpriv->divisor1), &(devpriv->divisor2), + &(cmd->convert_arg), + cmd->flags & TRIG_ROUND_MASK); + if (tmp_arg != cmd->convert_arg) + err++; + } + // if we are in burst mode + else { + // check that convert_arg is compatible + tmp_arg = cmd->convert_arg; + cmd->convert_arg = + burst_convert_arg(cmd->convert_arg, + cmd->flags & TRIG_ROUND_MASK); + if (tmp_arg != cmd->convert_arg) + err++; + + if (cmd->scan_begin_src == TRIG_TIMER) { + // if scans are timed faster than conversion rate allows + if (cmd->convert_arg * cmd->chanlist_len > + cmd->scan_begin_arg) { + cmd->scan_begin_arg = + cmd->convert_arg * + cmd->chanlist_len; + err++; + } + tmp_arg = cmd->scan_begin_arg; + /* calculate counter values that give desired timing */ + i8253_cascade_ns_to_timer_2div(TIMER_BASE, + &(devpriv->divisor1), + &(devpriv->divisor2), + &(cmd->scan_begin_arg), + cmd->flags & TRIG_ROUND_MASK); + if (tmp_arg != cmd->scan_begin_arg) + err++; + } + } + } + + if (err) + return 4; + + // make sure user is not trying to mix unipolar and bipolar ranges + if (cmd->chanlist) { + unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR; + for (i = 1; i < cmd->chanlist_len; i++) { + if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) { + comedi_error(dev, + "unipolar and bipolar ranges cannot be mixed in the chanlist"); + err++; + break; + } + } + } + + if (err) + return 5; + + return 0; +} + +/* analog input cmd interface */ + +// first, some utility functions used in the main ai_do_cmd() + +// returns appropriate bits for control register a, depending on command +static int control_a_bits(struct comedi_cmd cmd) +{ + int control_a; + + control_a = FFEN; //enable fifo + if (cmd.stop_src == TRIG_EXT) { + control_a |= ATEN; + } + switch (cmd.start_src) { + case TRIG_EXT: + control_a |= TGEN | CGSL; + break; + case TRIG_NOW: + control_a |= CGEN; + break; + default: + break; + } + + return control_a; +} + +// returns appropriate bits for control register c, depending on command +static int control_c_bits(struct comedi_cmd cmd) +{ + int control_c; + int aref; + + /* set clock source to internal or external, select analog reference, + * select unipolar / bipolar + */ + aref = CR_AREF(cmd.chanlist[0]); + control_c = UQEN; //enable upper qram addresses + if (aref != AREF_DIFF) + control_c |= SD; + if (aref == AREF_COMMON) + control_c |= CMEN; + /* if a unipolar range was selected */ + if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR) + control_c |= UB; + switch (cmd.scan_begin_src) { + case TRIG_FOLLOW: // not in burst mode + switch (cmd.convert_src) { + case TRIG_TIMER: + /* trig on cascaded counters */ + control_c |= IPCLK; + break; + case TRIG_EXT: + /* trig on falling edge of external trigger */ + control_c |= XPCLK; + break; + default: + break; + } + break; + case TRIG_TIMER: + // burst mode with internal pacer clock + control_c |= BMDE | IPCLK; + break; + case TRIG_EXT: + // burst mode with external trigger + control_c |= BMDE | XPCLK; + break; + default: + break; + } + + return control_c; +} + +// sets up counters +static int setup_counters(struct comedi_device * dev, struct comedi_cmd cmd) +{ + // setup cascaded counters for conversion/scan frequency + switch (cmd.scan_begin_src) { + case TRIG_FOLLOW: // not in burst mode + if (cmd.convert_src == TRIG_TIMER) { + /* set conversion frequency */ + i8253_cascade_ns_to_timer_2div(TIMER_BASE, + &(devpriv->divisor1), &(devpriv->divisor2), + &(cmd.convert_arg), + cmd.flags & TRIG_ROUND_MASK); + if (das1800_set_frequency(dev) < 0) { + return -1; + } + } + break; + case TRIG_TIMER: // in burst mode + /* set scan frequency */ + i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), + &(devpriv->divisor2), &(cmd.scan_begin_arg), + cmd.flags & TRIG_ROUND_MASK); + if (das1800_set_frequency(dev) < 0) { + return -1; + } + break; + default: + break; + } + + // setup counter 0 for 'about triggering' + if (cmd.stop_src == TRIG_EXT) { + // load counter 0 in mode 0 + i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0); + } + + return 0; +} + +// sets up dma +static void setup_dma(struct comedi_device * dev, struct comedi_cmd cmd) +{ + unsigned long lock_flags; + const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; + + if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0) + return; + + /* determine a reasonable dma transfer size */ + devpriv->dma_transfer_size = suggest_transfer_size(&cmd); + lock_flags = claim_dma_lock(); + disable_dma(devpriv->dma0); + /* clear flip-flop to make sure 2-byte registers for + * count and address get set correctly */ + clear_dma_ff(devpriv->dma0); + set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0)); + // set appropriate size of transfer + set_dma_count(devpriv->dma0, devpriv->dma_transfer_size); + devpriv->dma_current = devpriv->dma0; + devpriv->dma_current_buf = devpriv->ai_buf0; + enable_dma(devpriv->dma0); + // set up dual dma if appropriate + if (dual_dma) { + disable_dma(devpriv->dma1); + /* clear flip-flop to make sure 2-byte registers for + * count and address get set correctly */ + clear_dma_ff(devpriv->dma1); + set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1)); + // set appropriate size of transfer + set_dma_count(devpriv->dma1, devpriv->dma_transfer_size); + enable_dma(devpriv->dma1); + } + release_dma_lock(lock_flags); + + return; +} + +// programs channel/gain list into card +static void program_chanlist(struct comedi_device * dev, struct comedi_cmd cmd) +{ + int i, n, chan_range; + unsigned long irq_flags; + const int range_mask = 0x3; //masks unipolar/bipolar bit off range + const int range_bitshift = 8; + + n = cmd.chanlist_len; + // spinlock protects indirect addressing + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ + outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */ + /* make channel / gain list */ + for (i = 0; i < n; i++) { + chan_range = + CR_CHAN(cmd.chanlist[i]) | ((CR_RANGE(cmd. + chanlist[i]) & range_mask) << + range_bitshift); + outw(chan_range, dev->iobase + DAS1800_QRAM); + } + outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + + return; +} + +// analog input do_cmd +static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice * s) +{ + int ret; + int control_a, control_c; + struct comedi_async *async = s->async; + struct comedi_cmd cmd = async->cmd; + + if (!dev->irq) { + comedi_error(dev, + "no irq assigned for das-1800, cannot do hardware conversions"); + return -1; + } + + /* disable dma on TRIG_WAKE_EOS, or TRIG_RT + * (because dma in handler is unsafe at hard real-time priority) */ + if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) { + devpriv->irq_dma_bits &= ~DMA_ENABLED; + } else { + devpriv->irq_dma_bits |= devpriv->dma_bits; + } + // interrupt on end of conversion for TRIG_WAKE_EOS + if (cmd.flags & TRIG_WAKE_EOS) { + // interrupt fifo not empty + devpriv->irq_dma_bits &= ~FIMD; + } else { + // interrupt fifo half full + devpriv->irq_dma_bits |= FIMD; + } + // determine how many conversions we need + if (cmd.stop_src == TRIG_COUNT) { + devpriv->count = cmd.stop_arg * cmd.chanlist_len; + } + + das1800_cancel(dev, s); + + // determine proper bits for control registers + control_a = control_a_bits(cmd); + control_c = control_c_bits(cmd); + + /* setup card and start */ + program_chanlist(dev, cmd); + ret = setup_counters(dev, cmd); + if (ret < 0) { + comedi_error(dev, "Error setting up counters"); + return ret; + } + setup_dma(dev, cmd); + outb(control_c, dev->iobase + DAS1800_CONTROL_C); + // set conversion rate and length for burst mode + if (control_c & BMDE) { + // program conversion period with number of microseconds minus 1 + outb(cmd.convert_arg / 1000 - 1, + dev->iobase + DAS1800_BURST_RATE); + outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH); + } + outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); // enable irq/dma + outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */ + outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ + + return 0; +} + +/* read analog input */ +static int das1800_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + int i, n; + int chan, range, aref, chan_range; + int timeout = 1000; + short dpnt; + int conv_flags = 0; + unsigned long irq_flags; + + /* set up analog reference and unipolar / bipolar mode */ + aref = CR_AREF(insn->chanspec); + conv_flags |= UQEN; + if (aref != AREF_DIFF) + conv_flags |= SD; + if (aref == AREF_COMMON) + conv_flags |= CMEN; + /* if a unipolar range was selected */ + if (CR_RANGE(insn->chanspec) & UNIPOLAR) + conv_flags |= UB; + + outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */ + outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ + outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */ + outb(FFEN, dev->iobase + DAS1800_CONTROL_A); + + chan = CR_CHAN(insn->chanspec); + /* mask of unipolar/bipolar bit from range */ + range = CR_RANGE(insn->chanspec) & 0x3; + chan_range = chan | (range << 8); + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ + outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */ + outw(chan_range, dev->iobase + DAS1800_QRAM); + outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ + outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */ + + for (n = 0; n < insn->n; n++) { + /* trigger conversion */ + outb(0, dev->iobase + DAS1800_FIFO); + for (i = 0; i < timeout; i++) { + if (inb(dev->iobase + DAS1800_STATUS) & FNE) + break; + } + if (i == timeout) { + comedi_error(dev, "timeout"); + return -ETIME; + } + dpnt = inw(dev->iobase + DAS1800_FIFO); + /* shift data to offset binary for bipolar ranges */ + if ((conv_flags & UB) == 0) + dpnt += 1 << (thisboard->resolution - 1); + data[n] = dpnt; + } + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + + return n; +} + +/* writes to an analog output channel */ +static int das1800_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + int chan = CR_CHAN(insn->chanspec); +// int range = CR_RANGE(insn->chanspec); + int update_chan = thisboard->ao_n_chan - 1; + short output; + unsigned long irq_flags; + + // card expects two's complement data + output = data[0] - (1 << (thisboard->resolution - 1)); + // if the write is to the 'update' channel, we need to remember its value + if (chan == update_chan) + devpriv->ao_update_bits = output; + // write to channel + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */ + outw(output, dev->iobase + DAS1800_DAC); + // now we need to write to 'update' channel to update all dac channels + if (chan != update_chan) { + outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */ + outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); + } + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + + return 1; +} + +/* reads from digital input channels */ +static int das1800_di_rbits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + + data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf; + data[0] = 0; + + return 2; +} + +/* writes to digital output channels */ +static int das1800_do_wbits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + unsigned int wbits; + + // only set bits that have been masked + data[0] &= (1 << s->n_chan) - 1; + wbits = devpriv->do_bits; + wbits &= ~data[0]; + wbits |= data[0] & data[1]; + devpriv->do_bits = wbits; + + outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); + + data[1] = devpriv->do_bits; + + return 2; +} + +/* loads counters with divisor1, divisor2 from private structure */ +static int das1800_set_frequency(struct comedi_device * dev) +{ + int err = 0; + + // counter 1, mode 2 + if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1, + 2)) + err++; + // counter 2, mode 2 + if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2, + 2)) + err++; + if (err) + return -1; + + return 0; +} + +/* converts requested conversion timing to timing compatible with + * hardware, used only when card is in 'burst mode' + */ +static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode) +{ + unsigned int micro_sec; + + // in burst mode, the maximum conversion time is 64 microseconds + if (convert_arg > 64000) + convert_arg = 64000; + + // the conversion time must be an integral number of microseconds + switch (round_mode) { + case TRIG_ROUND_NEAREST: + default: + micro_sec = (convert_arg + 500) / 1000; + break; + case TRIG_ROUND_DOWN: + micro_sec = convert_arg / 1000; + break; + case TRIG_ROUND_UP: + micro_sec = (convert_arg - 1) / 1000 + 1; + break; + } + + // return number of nanoseconds + return micro_sec * 1000; +} + +// utility function that suggests a dma transfer size based on the conversion period 'ns' +static unsigned int suggest_transfer_size(struct comedi_cmd * cmd) +{ + unsigned int size = DMA_BUF_SIZE; + static const int sample_size = 2; // size in bytes of one sample from board + unsigned int fill_time = 300000000; // target time in nanoseconds for filling dma buffer + unsigned int max_size; // maximum size we will allow for a transfer + + // make dma buffer fill in 0.3 seconds for timed modes + switch (cmd->scan_begin_src) { + case TRIG_FOLLOW: // not in burst mode + if (cmd->convert_src == TRIG_TIMER) + size = (fill_time / cmd->convert_arg) * sample_size; + break; + case TRIG_TIMER: + size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) * + sample_size; + break; + default: + size = DMA_BUF_SIZE; + break; + } + + // set a minimum and maximum size allowed + max_size = DMA_BUF_SIZE; + // if we are taking limited number of conversions, limit transfer size to that + if (cmd->stop_src == TRIG_COUNT && + cmd->stop_arg * cmd->chanlist_len * sample_size < max_size) + max_size = cmd->stop_arg * cmd->chanlist_len * sample_size; + + if (size > max_size) + size = max_size; + if (size < sample_size) + size = sample_size; + + return size; +} |