diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/das16m1.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/das16m1.c | 622 |
1 files changed, 0 insertions, 622 deletions
diff --git a/drivers/staging/comedi/drivers/das16m1.c b/drivers/staging/comedi/drivers/das16m1.c deleted file mode 100644 index 75f3dbbe97ac..000000000000 --- a/drivers/staging/comedi/drivers/das16m1.c +++ /dev/null @@ -1,622 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Comedi driver for CIO-DAS16/M1 - * Author: Frank Mori Hess, based on code from the das16 driver. - * Copyright (C) 2001 Frank Mori Hess <fmhess@users.sourceforge.net> - * - * COMEDI - Linux Control and Measurement Device Interface - * Copyright (C) 2000 David A. Schleef <ds@schleef.org> - */ - -/* - * Driver: das16m1 - * Description: CIO-DAS16/M1 - * Author: Frank Mori Hess <fmhess@users.sourceforge.net> - * Devices: [Measurement Computing] CIO-DAS16/M1 (das16m1) - * Status: works - * - * This driver supports a single board - the CIO-DAS16/M1. As far as I know, - * there are no other boards that have the same register layout. Even the - * CIO-DAS16/M1/16 is significantly different. - * - * I was _barely_ able to reach the full 1 MHz capability of this board, using - * a hard real-time interrupt (set the TRIG_RT flag in your struct comedi_cmd - * and use rtlinux or RTAI). The board can't do dma, so the bottleneck is - * pulling the data across the ISA bus. I timed the interrupt handler, and it - * took my computer ~470 microseconds to pull 512 samples from the board. So - * at 1 Mhz sampling rate, expect your CPU to be spending almost all of its - * time in the interrupt handler. - * - * This board has some unusual restrictions for its channel/gain list. If the - * list has 2 or more channels in it, then two conditions must be satisfied: - * (1) - even/odd channels must appear at even/odd indices in the list - * (2) - the list must have an even number of entries. - * - * Configuration options: - * [0] - base io address - * [1] - irq (optional, but you probably want it) - * - * irq can be omitted, although the cmd interface will not work without it. - */ - -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/interrupt.h> -#include "../comedidev.h" - -#include "8255.h" -#include "comedi_8254.h" - -/* - * Register map (dev->iobase) - */ -#define DAS16M1_AI_REG 0x00 /* 16-bit register */ -#define DAS16M1_AI_TO_CHAN(x) (((x) >> 0) & 0xf) -#define DAS16M1_AI_TO_SAMPLE(x) (((x) >> 4) & 0xfff) -#define DAS16M1_CS_REG 0x02 -#define DAS16M1_CS_EXT_TRIG BIT(0) -#define DAS16M1_CS_OVRUN BIT(5) -#define DAS16M1_CS_IRQDATA BIT(7) -#define DAS16M1_DI_REG 0x03 -#define DAS16M1_DO_REG 0x03 -#define DAS16M1_CLR_INTR_REG 0x04 -#define DAS16M1_INTR_CTRL_REG 0x05 -#define DAS16M1_INTR_CTRL_PACER(x) (((x) & 0x3) << 0) -#define DAS16M1_INTR_CTRL_PACER_EXT DAS16M1_INTR_CTRL_PACER(2) -#define DAS16M1_INTR_CTRL_PACER_INT DAS16M1_INTR_CTRL_PACER(3) -#define DAS16M1_INTR_CTRL_PACER_MASK DAS16M1_INTR_CTRL_PACER(3) -#define DAS16M1_INTR_CTRL_IRQ(x) (((x) & 0x7) << 4) -#define DAS16M1_INTR_CTRL_INTE BIT(7) -#define DAS16M1_Q_ADDR_REG 0x06 -#define DAS16M1_Q_REG 0x07 -#define DAS16M1_Q_CHAN(x) (((x) & 0x7) << 0) -#define DAS16M1_Q_RANGE(x) (((x) & 0xf) << 4) -#define DAS16M1_8254_IOBASE1 0x08 -#define DAS16M1_8254_IOBASE2 0x0c -#define DAS16M1_8255_IOBASE 0x400 -#define DAS16M1_8254_IOBASE3 0x404 - -#define DAS16M1_SIZE2 0x08 - -#define DAS16M1_AI_FIFO_SZ 1024 /* # samples */ - -static const struct comedi_lrange range_das16m1 = { - 9, { - BIP_RANGE(5), - BIP_RANGE(2.5), - BIP_RANGE(1.25), - BIP_RANGE(0.625), - UNI_RANGE(10), - UNI_RANGE(5), - UNI_RANGE(2.5), - UNI_RANGE(1.25), - BIP_RANGE(10) - } -}; - -struct das16m1_private { - struct comedi_8254 *counter; - unsigned int intr_ctrl; - unsigned int adc_count; - u16 initial_hw_count; - unsigned short ai_buffer[DAS16M1_AI_FIFO_SZ]; - unsigned long extra_iobase; -}; - -static void das16m1_ai_set_queue(struct comedi_device *dev, - unsigned int *chanspec, unsigned int len) -{ - unsigned int i; - - for (i = 0; i < len; i++) { - unsigned int chan = CR_CHAN(chanspec[i]); - unsigned int range = CR_RANGE(chanspec[i]); - - outb(i, dev->iobase + DAS16M1_Q_ADDR_REG); - outb(DAS16M1_Q_CHAN(chan) | DAS16M1_Q_RANGE(range), - dev->iobase + DAS16M1_Q_REG); - } -} - -static void das16m1_ai_munge(struct comedi_device *dev, - struct comedi_subdevice *s, - void *data, unsigned int num_bytes, - unsigned int start_chan_index) -{ - unsigned short *array = data; - unsigned int nsamples = comedi_bytes_to_samples(s, num_bytes); - unsigned int i; - - /* - * The fifo values have the channel number in the lower 4-bits and - * the sample in the upper 12-bits. This just shifts the values - * to remove the channel numbers. - */ - for (i = 0; i < nsamples; i++) - array[i] = DAS16M1_AI_TO_SAMPLE(array[i]); -} - -static int das16m1_ai_check_chanlist(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_cmd *cmd) -{ - int i; - - if (cmd->chanlist_len == 1) - return 0; - - if ((cmd->chanlist_len % 2) != 0) { - dev_dbg(dev->class_dev, - "chanlist must be of even length or length 1\n"); - return -EINVAL; - } - - for (i = 0; i < cmd->chanlist_len; i++) { - unsigned int chan = CR_CHAN(cmd->chanlist[i]); - - if ((i % 2) != (chan % 2)) { - dev_dbg(dev->class_dev, - "even/odd channels must go have even/odd chanlist indices\n"); - return -EINVAL; - } - } - - return 0; -} - -static int das16m1_ai_cmdtest(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_cmd *cmd) -{ - int err = 0; - - /* Step 1 : check if triggers are trivially valid */ - - err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT); - err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_FOLLOW); - err |= comedi_check_trigger_src(&cmd->convert_src, - TRIG_TIMER | TRIG_EXT); - err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); - err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE); - - if (err) - return 1; - - /* Step 2a : make sure trigger sources are unique */ - - err |= comedi_check_trigger_is_unique(cmd->start_src); - err |= comedi_check_trigger_is_unique(cmd->convert_src); - err |= comedi_check_trigger_is_unique(cmd->stop_src); - - /* Step 2b : and mutually compatible */ - - if (err) - return 2; - - /* Step 3: check if arguments are trivially valid */ - - err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0); - - if (cmd->scan_begin_src == TRIG_FOLLOW) /* internal trigger */ - err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0); - - if (cmd->convert_src == TRIG_TIMER) - err |= comedi_check_trigger_arg_min(&cmd->convert_arg, 1000); - - err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, - cmd->chanlist_len); - - if (cmd->stop_src == TRIG_COUNT) - err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1); - else /* TRIG_NONE */ - err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0); - - if (err) - return 3; - - /* step 4: fix up arguments */ - - if (cmd->convert_src == TRIG_TIMER) { - unsigned int arg = cmd->convert_arg; - - comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags); - err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg); - } - - if (err) - return 4; - - /* Step 5: check channel list if it exists */ - if (cmd->chanlist && cmd->chanlist_len > 0) - err |= das16m1_ai_check_chanlist(dev, s, cmd); - - if (err) - return 5; - - return 0; -} - -static int das16m1_ai_cmd(struct comedi_device *dev, - struct comedi_subdevice *s) -{ - struct das16m1_private *devpriv = dev->private; - struct comedi_async *async = s->async; - struct comedi_cmd *cmd = &async->cmd; - unsigned int byte; - - /* set software count */ - devpriv->adc_count = 0; - - /* - * Initialize lower half of hardware counter, used to determine how - * many samples are in fifo. Value doesn't actually load into counter - * until counter's next clock (the next a/d conversion). - */ - comedi_8254_set_mode(devpriv->counter, 1, I8254_MODE2 | I8254_BINARY); - comedi_8254_write(devpriv->counter, 1, 0); - - /* - * Remember current reading of counter so we know when counter has - * actually been loaded. - */ - devpriv->initial_hw_count = comedi_8254_read(devpriv->counter, 1); - - das16m1_ai_set_queue(dev, cmd->chanlist, cmd->chanlist_len); - - /* enable interrupts and set internal pacer counter mode and counts */ - devpriv->intr_ctrl &= ~DAS16M1_INTR_CTRL_PACER_MASK; - if (cmd->convert_src == TRIG_TIMER) { - comedi_8254_update_divisors(dev->pacer); - comedi_8254_pacer_enable(dev->pacer, 1, 2, true); - devpriv->intr_ctrl |= DAS16M1_INTR_CTRL_PACER_INT; - } else { /* TRIG_EXT */ - devpriv->intr_ctrl |= DAS16M1_INTR_CTRL_PACER_EXT; - } - - /* set control & status register */ - byte = 0; - /* - * If we are using external start trigger (also board dislikes having - * both start and conversion triggers external simultaneously). - */ - if (cmd->start_src == TRIG_EXT && cmd->convert_src != TRIG_EXT) - byte |= DAS16M1_CS_EXT_TRIG; - - outb(byte, dev->iobase + DAS16M1_CS_REG); - - /* clear interrupt */ - outb(0, dev->iobase + DAS16M1_CLR_INTR_REG); - - devpriv->intr_ctrl |= DAS16M1_INTR_CTRL_INTE; - outb(devpriv->intr_ctrl, dev->iobase + DAS16M1_INTR_CTRL_REG); - - return 0; -} - -static int das16m1_ai_cancel(struct comedi_device *dev, - struct comedi_subdevice *s) -{ - struct das16m1_private *devpriv = dev->private; - - /* disable interrupts and pacer */ - devpriv->intr_ctrl &= ~(DAS16M1_INTR_CTRL_INTE | - DAS16M1_INTR_CTRL_PACER_MASK); - outb(devpriv->intr_ctrl, dev->iobase + DAS16M1_INTR_CTRL_REG); - - return 0; -} - -static int das16m1_ai_eoc(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned long context) -{ - unsigned int status; - - status = inb(dev->iobase + DAS16M1_CS_REG); - if (status & DAS16M1_CS_IRQDATA) - return 0; - return -EBUSY; -} - -static int das16m1_ai_insn_read(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned int *data) -{ - int ret; - int i; - - das16m1_ai_set_queue(dev, &insn->chanspec, 1); - - for (i = 0; i < insn->n; i++) { - unsigned short val; - - /* clear interrupt */ - outb(0, dev->iobase + DAS16M1_CLR_INTR_REG); - /* trigger conversion */ - outb(0, dev->iobase + DAS16M1_AI_REG); - - ret = comedi_timeout(dev, s, insn, das16m1_ai_eoc, 0); - if (ret) - return ret; - - val = inw(dev->iobase + DAS16M1_AI_REG); - data[i] = DAS16M1_AI_TO_SAMPLE(val); - } - - return insn->n; -} - -static int das16m1_di_insn_bits(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned int *data) -{ - data[1] = inb(dev->iobase + DAS16M1_DI_REG) & 0xf; - - return insn->n; -} - -static int das16m1_do_insn_bits(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned int *data) -{ - if (comedi_dio_update_state(s, data)) - outb(s->state, dev->iobase + DAS16M1_DO_REG); - - data[1] = s->state; - - return insn->n; -} - -static void das16m1_handler(struct comedi_device *dev, unsigned int status) -{ - struct das16m1_private *devpriv = dev->private; - struct comedi_subdevice *s = dev->read_subdev; - struct comedi_async *async = s->async; - struct comedi_cmd *cmd = &async->cmd; - u16 num_samples; - u16 hw_counter; - - /* figure out how many samples are in fifo */ - hw_counter = comedi_8254_read(devpriv->counter, 1); - /* - * Make sure hardware counter reading is not bogus due to initial - * value not having been loaded yet. - */ - if (devpriv->adc_count == 0 && - hw_counter == devpriv->initial_hw_count) { - num_samples = 0; - } else { - /* - * The calculation of num_samples looks odd, but it uses the - * following facts. 16 bit hardware counter is initialized with - * value of zero (which really means 0x1000). The counter - * decrements by one on each conversion (when the counter - * decrements from zero it goes to 0xffff). num_samples is a - * 16 bit variable, so it will roll over in a similar fashion - * to the hardware counter. Work it out, and this is what you - * get. - */ - num_samples = -hw_counter - devpriv->adc_count; - } - /* check if we only need some of the points */ - if (cmd->stop_src == TRIG_COUNT) { - if (num_samples > cmd->stop_arg * cmd->chanlist_len) - num_samples = cmd->stop_arg * cmd->chanlist_len; - } - /* make sure we don't try to get too many points if fifo has overrun */ - if (num_samples > DAS16M1_AI_FIFO_SZ) - num_samples = DAS16M1_AI_FIFO_SZ; - insw(dev->iobase, devpriv->ai_buffer, num_samples); - comedi_buf_write_samples(s, devpriv->ai_buffer, num_samples); - devpriv->adc_count += num_samples; - - if (cmd->stop_src == TRIG_COUNT) { - if (devpriv->adc_count >= cmd->stop_arg * cmd->chanlist_len) { - /* end of acquisition */ - async->events |= COMEDI_CB_EOA; - } - } - - /* - * This probably won't catch overruns since the card doesn't generate - * overrun interrupts, but we might as well try. - */ - if (status & DAS16M1_CS_OVRUN) { - async->events |= COMEDI_CB_ERROR; - dev_err(dev->class_dev, "fifo overflow\n"); - } - - comedi_handle_events(dev, s); -} - -static int das16m1_ai_poll(struct comedi_device *dev, - struct comedi_subdevice *s) -{ - unsigned long flags; - unsigned int status; - - /* prevent race with interrupt handler */ - spin_lock_irqsave(&dev->spinlock, flags); - status = inb(dev->iobase + DAS16M1_CS_REG); - das16m1_handler(dev, status); - spin_unlock_irqrestore(&dev->spinlock, flags); - - return comedi_buf_n_bytes_ready(s); -} - -static irqreturn_t das16m1_interrupt(int irq, void *d) -{ - int status; - struct comedi_device *dev = d; - - if (!dev->attached) { - dev_err(dev->class_dev, "premature interrupt\n"); - return IRQ_HANDLED; - } - /* prevent race with comedi_poll() */ - spin_lock(&dev->spinlock); - - status = inb(dev->iobase + DAS16M1_CS_REG); - - if ((status & (DAS16M1_CS_IRQDATA | DAS16M1_CS_OVRUN)) == 0) { - dev_err(dev->class_dev, "spurious interrupt\n"); - spin_unlock(&dev->spinlock); - return IRQ_NONE; - } - - das16m1_handler(dev, status); - - /* clear interrupt */ - outb(0, dev->iobase + DAS16M1_CLR_INTR_REG); - - spin_unlock(&dev->spinlock); - return IRQ_HANDLED; -} - -static int das16m1_irq_bits(unsigned int irq) -{ - switch (irq) { - case 10: - return 0x0; - case 11: - return 0x1; - case 12: - return 0x2; - case 15: - return 0x3; - case 2: - return 0x4; - case 3: - return 0x5; - case 5: - return 0x6; - case 7: - return 0x7; - default: - return 0x0; - } -} - -static int das16m1_attach(struct comedi_device *dev, - struct comedi_devconfig *it) -{ - struct das16m1_private *devpriv; - struct comedi_subdevice *s; - int ret; - - devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); - if (!devpriv) - return -ENOMEM; - - ret = comedi_request_region(dev, it->options[0], 0x10); - if (ret) - return ret; - /* Request an additional region for the 8255 and 3rd 8254 */ - ret = __comedi_request_region(dev, dev->iobase + DAS16M1_8255_IOBASE, - DAS16M1_SIZE2); - if (ret) - return ret; - devpriv->extra_iobase = dev->iobase + DAS16M1_8255_IOBASE; - - /* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */ - if ((1 << it->options[1]) & 0xdcfc) { - ret = request_irq(it->options[1], das16m1_interrupt, 0, - dev->board_name, dev); - if (ret == 0) - dev->irq = it->options[1]; - } - - dev->pacer = comedi_8254_init(dev->iobase + DAS16M1_8254_IOBASE2, - I8254_OSC_BASE_10MHZ, I8254_IO8, 0); - if (!dev->pacer) - return -ENOMEM; - - devpriv->counter = comedi_8254_init(dev->iobase + DAS16M1_8254_IOBASE1, - 0, I8254_IO8, 0); - if (!devpriv->counter) - return -ENOMEM; - - ret = comedi_alloc_subdevices(dev, 4); - if (ret) - return ret; - - /* Analog Input subdevice */ - s = &dev->subdevices[0]; - s->type = COMEDI_SUBD_AI; - s->subdev_flags = SDF_READABLE | SDF_DIFF; - s->n_chan = 8; - s->maxdata = 0x0fff; - s->range_table = &range_das16m1; - s->insn_read = das16m1_ai_insn_read; - if (dev->irq) { - dev->read_subdev = s; - s->subdev_flags |= SDF_CMD_READ; - s->len_chanlist = 256; - s->do_cmdtest = das16m1_ai_cmdtest; - s->do_cmd = das16m1_ai_cmd; - s->cancel = das16m1_ai_cancel; - s->poll = das16m1_ai_poll; - s->munge = das16m1_ai_munge; - } - - /* Digital Input subdevice */ - s = &dev->subdevices[1]; - 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 = das16m1_di_insn_bits; - - /* Digital Output subdevice */ - s = &dev->subdevices[2]; - s->type = COMEDI_SUBD_DO; - s->subdev_flags = SDF_WRITABLE; - s->n_chan = 4; - s->maxdata = 1; - s->range_table = &range_digital; - s->insn_bits = das16m1_do_insn_bits; - - /* Digital I/O subdevice (8255) */ - s = &dev->subdevices[3]; - ret = subdev_8255_init(dev, s, NULL, DAS16M1_8255_IOBASE); - if (ret) - return ret; - - /* initialize digital output lines */ - outb(0, dev->iobase + DAS16M1_DO_REG); - - /* set the interrupt level */ - devpriv->intr_ctrl = DAS16M1_INTR_CTRL_IRQ(das16m1_irq_bits(dev->irq)); - outb(devpriv->intr_ctrl, dev->iobase + DAS16M1_INTR_CTRL_REG); - - return 0; -} - -static void das16m1_detach(struct comedi_device *dev) -{ - struct das16m1_private *devpriv = dev->private; - - if (devpriv) { - if (devpriv->extra_iobase) - release_region(devpriv->extra_iobase, DAS16M1_SIZE2); - kfree(devpriv->counter); - } - comedi_legacy_detach(dev); -} - -static struct comedi_driver das16m1_driver = { - .driver_name = "das16m1", - .module = THIS_MODULE, - .attach = das16m1_attach, - .detach = das16m1_detach, -}; -module_comedi_driver(das16m1_driver); - -MODULE_AUTHOR("Comedi https://www.comedi.org"); -MODULE_DESCRIPTION("Comedi driver for CIO-DAS16/M1 ISA cards"); -MODULE_LICENSE("GPL"); |