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-rw-r--r--drivers/comedi/drivers/das16m1.c621
1 files changed, 621 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/das16m1.c b/drivers/comedi/drivers/das16m1.c
new file mode 100644
index 000000000..275effb77
--- /dev/null
+++ b/drivers/comedi/drivers/das16m1.c
@@ -0,0 +1,621 @@
+// 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 <linux/comedi/comedidev.h>
+#include <linux/comedi/comedi_8255.h>
+#include <linux/comedi/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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 11:12:12 +0000