// SPDX-License-Identifier: GPL-2.0
/*
* comedi/drivers/pcl818.c
*
* Driver: pcl818
* Description: Advantech PCL-818 cards, PCL-718
* Author: Michal Dobes <[email protected]>
* Devices: [Advantech] PCL-818L (pcl818l), PCL-818H (pcl818h),
* PCL-818HD (pcl818hd), PCL-818HG (pcl818hg), PCL-818 (pcl818),
* PCL-718 (pcl718)
* Status: works
*
* All cards have 16 SE/8 DIFF ADCs, one or two DACs, 16 DI and 16 DO.
* Differences are only at maximal sample speed, range list and FIFO
* support.
* The driver support AI mode 0, 1, 3 other subdevices (AO, DI, DO) support
* only mode 0. If DMA/FIFO/INT are disabled then AI support only mode 0.
* PCL-818HD and PCL-818HG support 1kword FIFO. Driver support this FIFO
* but this code is untested.
* A word or two about DMA. Driver support DMA operations at two ways:
* 1) DMA uses two buffers and after one is filled then is generated
* INT and DMA restart with second buffer. With this mode I'm unable run
* more that 80Ksamples/secs without data dropouts on K6/233.
* 2) DMA uses one buffer and run in autoinit mode and the data are
* from DMA buffer moved on the fly with 2kHz interrupts from RTC.
* This mode is used if the interrupt 8 is available for allocation.
* If not, then first DMA mode is used. With this I can run at
* full speed one card (100ksamples/secs) or two cards with
* 60ksamples/secs each (more is problem on account of ISA limitations).
* To use this mode you must have compiled kernel with disabled
* "Enhanced Real Time Clock Support".
* Maybe you can have problems if you use xntpd or similar.
* If you've data dropouts with DMA mode 2 then:
* a) disable IDE DMA
* b) switch text mode console to fb.
*
* Options for PCL-818L:
* [0] - IO Base
* [1] - IRQ (0=disable, 2, 3, 4, 5, 6, 7)
* [2] - DMA (0=disable, 1, 3)
* [3] - 0, 10=10MHz clock for 8254
* 1= 1MHz clock for 8254
* [4] - 0, 5=A/D input -5V.. +5V
* 1, 10=A/D input -10V..+10V
* [5] - 0, 5=D/A output 0-5V (internal reference -5V)
* 1, 10=D/A output 0-10V (internal reference -10V)
* 2 =D/A output unknown (external reference)
*
* Options for PCL-818, PCL-818H:
* [0] - IO Base
* [1] - IRQ (0=disable, 2, 3, 4, 5, 6, 7)
* [2] - DMA (0=disable, 1, 3)
* [3] - 0, 10=10MHz clock for 8254
* 1= 1MHz clock for 8254
* [4] - 0, 5=D/A output 0-5V (internal reference -5V)
* 1, 10=D/A output 0-10V (internal reference -10V)
* 2 =D/A output unknown (external reference)
*
* Options for PCL-818HD, PCL-818HG:
* [0] - IO Base
* [1] - IRQ (0=disable, 2, 3, 4, 5, 6, 7)
* [2] - DMA/FIFO (-1=use FIFO, 0=disable both FIFO and DMA,
* 1=use DMA ch 1, 3=use DMA ch 3)
* [3] - 0, 10=10MHz clock for 8254
* 1= 1MHz clock for 8254
* [4] - 0, 5=D/A output 0-5V (internal reference -5V)
* 1, 10=D/A output 0-10V (internal reference -10V)
* 2 =D/A output unknown (external reference)
*
* Options for PCL-718:
* [0] - IO Base
* [1] - IRQ (0=disable, 2, 3, 4, 5, 6, 7)
* [2] - DMA (0=disable, 1, 3)
* [3] - 0, 10=10MHz clock for 8254
* 1= 1MHz clock for 8254
* [4] - 0=A/D Range is +/-10V
* 1= +/-5V
* 2= +/-2.5V
* 3= +/-1V
* 4= +/-0.5V
* 5= user defined bipolar
* 6= 0-10V
* 7= 0-5V
* 8= 0-2V
* 9= 0-1V
* 10= user defined unipolar
* [5] - 0, 5=D/A outputs 0-5V (internal reference -5V)
* 1, 10=D/A outputs 0-10V (internal reference -10V)
* 2=D/A outputs unknown (external reference)
* [6] - 0, 60=max 60kHz A/D sampling
* 1,100=max 100kHz A/D sampling (PCL-718 with Option 001 installed)
*
*/
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/comedi/comedidev.h>
#include <linux/comedi/comedi_8254.h>
#include <linux/comedi/comedi_isadma.h>
/*
* Register I/O map
*/
#define PCL818_AI_LSB_REG 0x00
#define PCL818_AI_MSB_REG 0x01
#define PCL818_RANGE_REG 0x01
#define PCL818_MUX_REG 0x02
#define PCL818_MUX_SCAN(_first, _last) (((_last) << 4) | (_first))
#define PCL818_DO_DI_LSB_REG 0x03
#define PCL818_AO_LSB_REG(x) (0x04 + ((x) * 2))
#define PCL818_AO_MSB_REG(x) (0x05 + ((x) * 2))
#define PCL818_STATUS_REG 0x08
#define PCL818_STATUS_NEXT_CHAN_MASK (0xf << 0)
#define PCL818_STATUS_INT BIT(4)
#define PCL818_STATUS_MUX BIT(5)
#define PCL818_STATUS_UNI BIT(6)
#define PCL818_STATUS_EOC BIT(7)
#define PCL818_CTRL_REG 0x09
#define PCL818_CTRL_TRIG(x) (((x) & 0x3) << 0)
#define PCL818_CTRL_DISABLE_TRIG PCL818_CTRL_TRIG(0)
#define PCL818_CTRL_SOFT_TRIG PCL818_CTRL_TRIG(1)
#define PCL818_CTRL_EXT_TRIG PCL818_CTRL_TRIG(2)
#define PCL818_CTRL_PACER_TRIG PCL818_CTRL_TRIG(3)
#define PCL818_CTRL_DMAE BIT(2)
#define PCL818_CTRL_IRQ(x) ((x) << 4)
#define PCL818_CTRL_INTE BIT(7)
#define PCL818_CNTENABLE_REG 0x0a
#define PCL818_CNTENABLE_PACER_TRIG0 BIT(0)
#define PCL818_CNTENABLE_CNT0_INT_CLK BIT(1) /* 0=ext clk */
#define PCL818_DO_DI_MSB_REG 0x0b
#define PCL818_TIMER_BASE 0x0c
/* W: fifo enable/disable */
#define PCL818_FI_ENABLE 6
/* W: fifo interrupt clear */
#define PCL818_FI_INTCLR 20
/* W: fifo interrupt clear */
#define PCL818_FI_FLUSH 25
/* R: fifo status */
#define PCL818_FI_STATUS 25
/* R: one record from FIFO */
#define PCL818_FI_DATALO 23
#define PCL818_FI_DATAHI 24
#define MAGIC_DMA_WORD 0x5a5a
static const struct comedi_lrange range_pcl818h_ai = {
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)
}
};
static const struct comedi_lrange range_pcl818hg_ai = {
10, {
BIP_RANGE(5),
BIP_RANGE(0.5),
BIP_RANGE(0.05),
BIP_RANGE(0.005),
UNI_RANGE(10),
UNI_RANGE(1),
UNI_RANGE(0.1),
UNI_RANGE(0.01),
BIP_RANGE(10),
BIP_RANGE(1),
BIP_RANGE(0.1),
BIP_RANGE(0.01)
}
};
static const struct comedi_lrange range_pcl818l_l_ai = {
4, {
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25),
BIP_RANGE(0.625)
}
};
static const struct comedi_lrange range_pcl818l_h_ai = {
4, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25)
}
};
static const struct comedi_lrange range718_bipolar1 = {
1, {
BIP_RANGE(1)
}
};
static const struct comedi_lrange range718_bipolar0_5 = {
1, {
BIP_RANGE(0.5)
}
};
static const struct comedi_lrange range718_unipolar2 = {
1, {
UNI_RANGE(2)
}
};
static const struct comedi_lrange range718_unipolar1 = {
1, {
BIP_RANGE(1)
}
};
struct pcl818_board {
const char *name;
unsigned int ns_min;
int n_aochan;
const struct comedi_lrange *ai_range_type;
unsigned int has_dma:1;
unsigned int has_fifo:1;
unsigned int is_818:1;
};
static const struct pcl818_board boardtypes[] = {
{
.name = "pcl818l",
.ns_min = 25000,
.n_aochan = 1,
.ai_range_type = &range_pcl818l_l_ai,
.has_dma = 1,
.is_818 = 1,
}, {
.name = "pcl818h",
.ns_min = 10000,
.n_aochan = 1,
.ai_range_type = &range_pcl818h_ai,
.has_dma = 1,
.is_818 = 1,
}, {
.name = "pcl818hd",
.ns_min = 10000,
.n_aochan = 1,
.ai_range_type = &range_pcl818h_ai,
.has_dma = 1,
.has_fifo = 1,
.is_818 = 1,
}, {
.name = "pcl818hg",
.ns_min = 10000,
.n_aochan = 1,
.ai_range_type = &range_pcl818hg_ai,
.has_dma = 1,
.has_fifo = 1,
.is_818 = 1,
}, {
.name = "pcl818",
.ns_min = 10000,
.n_aochan = 2,
.ai_range_type = &range_pcl818h_ai,
.has_dma = 1,
.is_818 = 1,
}, {
.name = "pcl718",
.ns_min = 16000,
.n_aochan = 2,
.ai_range_type = &range_unipolar5,
.has_dma = 1,
}, {
.name = "pcm3718",
.ns_min = 10000,
.ai_range_type = &range_pcl818h_ai,
.has_dma = 1,
.is_818 = 1,
},
};
struct pcl818_private {
struct comedi_isadma *dma;
/* manimal allowed delay between samples (in us) for actual card */
unsigned int ns_min;
/* MUX setting for actual AI operations */
unsigned int act_chanlist[16];
unsigned int act_chanlist_len; /* how long is actual MUX list */
unsigned int act_chanlist_pos; /* actual position in MUX list */
unsigned int usefifo:1;
unsigned int ai_cmd_running:1;
unsigned int ai_cmd_canceled:1;
};
static void pcl818_ai_setup_dma(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int unread_samples)
{
struct pcl818_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
unsigned int max_samples = comedi_bytes_to_samples(s, desc->maxsize);
unsigned int nsamples;
comedi_isadma_disable(dma->chan);
/*
* Determine dma size based on the buffer maxsize plus the number of
* unread samples and the number of samples remaining in the command.
*/
nsamples = comedi_nsamples_left(s, max_samples + unread_samples);
if (nsamples > unread_samples) {
nsamples -= unread_samples;
desc->size = comedi_samples_to_bytes(s, nsamples);
comedi_isadma_program(desc);
}
}
static void pcl818_ai_set_chan_range(struct comedi_device *dev,
unsigned int chan,
unsigned int range)
{
outb(chan, dev->iobase + PCL818_MUX_REG);
outb(range, dev->iobase + PCL818_RANGE_REG);
}
static void pcl818_ai_set_chan_scan(struct comedi_device *dev,
unsigned int first_chan,
unsigned int last_chan)
{
outb(PCL818_MUX_SCAN(first_chan, last_chan),
dev->iobase + PCL818_MUX_REG);
}
static void pcl818_ai_setup_chanlist(struct comedi_device *dev,
unsigned int *chanlist,
unsigned int seglen)
{
struct pcl818_private *devpriv = dev->private;
unsigned int first_chan = CR_CHAN(chanlist[0]);
unsigned int last_chan;
unsigned int range;
int i;
devpriv->act_chanlist_len = seglen;
devpriv->act_chanlist_pos = 0;
/* store range list to card */
for (i = 0; i < seglen; i++) {
last_chan = CR_CHAN(chanlist[i]);
range = CR_RANGE(chanlist[i]);
devpriv->act_chanlist[i] = last_chan;
pcl818_ai_set_chan_range(dev, last_chan, range);
}
udelay(1);
pcl818_ai_set_chan_scan(dev, first_chan, last_chan);
}
static void pcl818_ai_clear_eoc(struct comedi_device *dev)
{
/* writing any value clears the interrupt request */
outb(0, dev->iobase + PCL818_STATUS_REG);
}
static void pcl818_ai_soft_trig(struct comedi_device *dev)
{
/* writing any value triggers a software conversion */
outb(0, dev->iobase + PCL818_AI_LSB_REG);
}
static unsigned int pcl818_ai_get_fifo_sample(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int *chan)
{
unsigned int val;
val = inb(dev->iobase + PCL818_FI_DATALO);
val |= (inb(dev->iobase + PCL818_FI_DATAHI) << 8);
if (chan)
*chan = val & 0xf;
return (val >> 4) & s->maxdata;
}
static unsigned int pcl818_ai_get_sample(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int *chan)
{
unsigned int val;
val = inb(dev->iobase + PCL818_AI_MSB_REG) << 8;
val |= inb(dev->iobase + PCL818_AI_LSB_REG);
if (chan)
*chan = val & 0xf;
return (val >> 4) & s->maxdata;
}
static int pcl818_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
unsigned int status;
status = inb(dev->iobase + PCL818_STATUS_REG);
if (status & PCL818_STATUS_INT)
return 0;
return -EBUSY;
}
static bool pcl818_ai_write_sample(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int chan, unsigned short val)
{
struct pcl818_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
unsigned int expected_chan;
expected_chan = devpriv->act_chanlist[devpriv->act_chanlist_pos];
if (chan != expected_chan) {
dev_dbg(dev->class_dev,
"A/D mode1/3 %s - channel dropout %d!=%d !\n",
(devpriv->dma) ? "DMA" :
(devpriv->usefifo) ? "FIFO" : "IRQ",
chan, expected_chan);
s->async->events |= COMEDI_CB_ERROR;
return false;
}
comedi_buf_write_samples(s, &val, 1);
devpriv->act_chanlist_pos++;
if (devpriv->act_chanlist_pos >= devpriv->act_chanlist_len)
devpriv->act_chanlist_pos = 0;
if (cmd->stop_src == TRIG_COUNT &&
s->async->scans_done >= cmd->stop_arg) {
s->async->events |= COMEDI_CB_EOA;
return false;
}
return true;
}
static void pcl818_handle_eoc(struct comedi_device *dev,
struct comedi_subdevice *s)
{
unsigned int chan;
unsigned int val;
if (pcl818_ai_eoc(dev, s, NULL, 0)) {
dev_err(dev->class_dev, "A/D mode1/3 IRQ without DRDY!\n");
s->async->events |= COMEDI_CB_ERROR;
return;
}
val = pcl818_ai_get_sample(dev, s, &chan);
pcl818_ai_write_sample(dev, s, chan, val);
}
static void pcl818_handle_dma(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct pcl818_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
unsigned short *ptr = desc->virt_addr;
unsigned int nsamples = comedi_bytes_to_samples(s, desc->size);
unsigned int chan;
unsigned int val;
int i;
/* restart dma with the next buffer */
dma->cur_dma = 1 - dma->cur_dma;
pcl818_ai_setup_dma(dev, s, nsamples);
for (i = 0; i < nsamples; i++) {
val = ptr[i];
chan = val & 0xf;
val = (val >> 4) & s->maxdata;
if (!pcl818_ai_write_sample(dev, s, chan, val))
break;
}
}
static void pcl818_handle_fifo(struct comedi_device *dev,
struct comedi_subdevice *s)
{
unsigned int status;
unsigned int chan;
unsigned int val;
int i, len;
status = inb(dev->iobase + PCL818_FI_STATUS);
if (status & 4) {
dev_err(dev->class_dev, "A/D mode1/3 FIFO overflow!\n");
s->async->events |= COMEDI_CB_ERROR;
return;
}
if (status & 1) {
dev_err(dev->class_dev,
"A/D mode1/3 FIFO interrupt without data!\n");
s->async->events |= COMEDI_CB_ERROR;
return;
}
if (status & 2)
len = 512;
else
len = 0;
for (i = 0; i < len; i++) {
val = pcl818_ai_get_fifo_sample(dev, s, &chan);
if (!pcl818_ai_write_sample(dev, s, chan, val))
break;
}
}
static irqreturn_t pcl818_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct pcl818_private *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_cmd *cmd = &s->async->cmd;
if (!dev->attached || !devpriv->ai_cmd_running) {
pcl818_ai_clear_eoc(dev);
return IRQ_HANDLED;
}
if (devpriv->ai_cmd_canceled) {
/*
* The cleanup from ai_cancel() has been delayed
* until now because the card doesn't seem to like
* being reprogrammed while a DMA transfer is in
* progress.
*/
s->async->scans_done = cmd->stop_arg;
s->cancel(dev, s);
return IRQ_HANDLED;
}
if (devpriv->dma)
pcl818_handle_dma(dev, s);
else if (devpriv->usefifo)
pcl818_handle_fifo(dev, s);
else
pcl818_handle_eoc(dev, s);
pcl818_ai_clear_eoc(dev);
comedi_handle_events(dev, s);
return IRQ_HANDLED;
}
static int check_channel_list(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int *chanlist, unsigned int n_chan)
{
unsigned int chansegment[16];
unsigned int i, nowmustbechan, seglen;
/* correct channel and range number check itself comedi/range.c */
if (n_chan < 1) {
dev_err(dev->class_dev, "range/channel list is empty!\n");
return 0;
}
if (n_chan > 1) {
/* first channel is every time ok */
chansegment[0] = chanlist[0];
/* build part of chanlist */
for (i = 1, seglen = 1; i < n_chan; i++, seglen++) {
/* we detect loop, this must by finish */
if (chanlist[0] == chanlist[i])
break;
nowmustbechan =
(CR_CHAN(chansegment[i - 1]) + 1) % s->n_chan;
if (nowmustbechan != CR_CHAN(chanlist[i])) {
/* channel list isn't continuous :-( */
dev_dbg(dev->class_dev,
"channel list must be continuous! chanlist[%i]=%d but must be %d or %d!\n",
i, CR_CHAN(chanlist[i]), nowmustbechan,
CR_CHAN(chanlist[0]));
return 0;
}
/* well, this is next correct channel in list */
chansegment[i] = chanlist[i];
}
/* check whole chanlist */
for (i = 0; i < n_chan; i++) {
if (chanlist[i] != chansegment[i % seglen]) {
dev_dbg(dev->class_dev,
"bad channel or range number! chanlist[%i]=%d,%d,%d and not %d,%d,%d!\n",
i, CR_CHAN(chansegment[i]),
CR_RANGE(chansegment[i]),
CR_AREF(chansegment[i]),
CR_CHAN(chanlist[i % seglen]),
CR_RANGE(chanlist[i % seglen]),
CR_AREF(chansegment[i % seglen]));
return 0; /* chan/gain list is strange */
}
}
} else {
seglen = 1;
}
return seglen;
}
static int check_single_ended(unsigned int port)
{
if (inb(port + PCL818_STATUS_REG) & PCL818_STATUS_MUX)
return 1;
return 0;
}
static int ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
const struct pcl818_board *board = dev->board_ptr;
int err = 0;
/* Step 1 : check if triggers are trivially valid */
err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
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->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);
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,
board->ns_min);
} else { /* TRIG_EXT */
err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
}
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 any 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: complain about special chanlist considerations */
if (cmd->chanlist) {
if (!check_channel_list(dev, s, cmd->chanlist,
cmd->chanlist_len))
return 5; /* incorrect channels list */
}
return 0;
}
static int pcl818_ai_cmd(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct pcl818_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_cmd *cmd = &s->async->cmd;
unsigned int ctrl = 0;
unsigned int seglen;
if (devpriv->ai_cmd_running)
return -EBUSY;
seglen = check_channel_list(dev, s, cmd->chanlist, cmd->chanlist_len);
if (seglen < 1)
return -EINVAL;
pcl818_ai_setup_chanlist(dev, cmd->chanlist, seglen);
devpriv->ai_cmd_running = 1;
devpriv->ai_cmd_canceled = 0;
devpriv->act_chanlist_pos = 0;
if (cmd->convert_src == TRIG_TIMER)
ctrl |= PCL818_CTRL_PACER_TRIG;
else
ctrl |= PCL818_CTRL_EXT_TRIG;
outb(0, dev->iobase + PCL818_CNTENABLE_REG);
if (dma) {
/* setup and enable dma for the first buffer */
dma->cur_dma = 0;
pcl818_ai_setup_dma(dev, s, 0);
ctrl |= PCL818_CTRL_INTE | PCL818_CTRL_IRQ(dev->irq) |
PCL818_CTRL_DMAE;
} else if (devpriv->usefifo) {
/* enable FIFO */
outb(1, dev->iobase + PCL818_FI_ENABLE);
} else {
ctrl |= PCL818_CTRL_INTE | PCL818_CTRL_IRQ(dev->irq);
}
outb(ctrl, dev->iobase + PCL818_CTRL_REG);
if (cmd->convert_src == TRIG_TIMER) {
comedi_8254_update_divisors(dev->pacer);
comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
}
return 0;
}
static int pcl818_ai_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct pcl818_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_cmd *cmd = &s->async->cmd;
if (!devpriv->ai_cmd_running)
return 0;
if (dma) {
if (cmd->stop_src == TRIG_NONE ||
(cmd->stop_src == TRIG_COUNT &&
s->async->scans_done < cmd->stop_arg)) {
if (!devpriv->ai_cmd_canceled) {
/*
* Wait for running dma transfer to end,
* do cleanup in interrupt.
*/
devpriv->ai_cmd_canceled = 1;
return 0;
}
}
comedi_isadma_disable(dma->chan);
}
outb(PCL818_CTRL_DISABLE_TRIG, dev->iobase + PCL818_CTRL_REG);
comedi_8254_pacer_enable(dev->pacer, 1, 2, false);
pcl818_ai_clear_eoc(dev);
if (devpriv->usefifo) { /* FIFO shutdown */
outb(0, dev->iobase + PCL818_FI_INTCLR);
outb(0, dev->iobase + PCL818_FI_FLUSH);
outb(0, dev->iobase + PCL818_FI_ENABLE);
}
devpriv->ai_cmd_running = 0;
devpriv->ai_cmd_canceled = 0;
return 0;
}
static int pcl818_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int range = CR_RANGE(insn->chanspec);
int ret = 0;
int i;
outb(PCL818_CTRL_SOFT_TRIG, dev->iobase + PCL818_CTRL_REG);
pcl818_ai_set_chan_range(dev, chan, range);
pcl818_ai_set_chan_scan(dev, chan, chan);
for (i = 0; i < insn->n; i++) {
pcl818_ai_clear_eoc(dev);
pcl818_ai_soft_trig(dev);
ret = comedi_timeout(dev, s, insn, pcl818_ai_eoc, 0);
if (ret)
break;
data[i] = pcl818_ai_get_sample(dev, s, NULL);
}
pcl818_ai_clear_eoc(dev);
return ret ? ret : insn->n;
}
static int pcl818_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int val = s->readback[chan];
int i;
for (i = 0; i < insn->n; i++) {
val = data[i];
outb((val & 0x000f) << 4,
dev->iobase + PCL818_AO_LSB_REG(chan));
outb((val & 0x0ff0) >> 4,
dev->iobase + PCL818_AO_MSB_REG(chan));
}
s->readback[chan] = val;
return insn->n;
}
static int pcl818_di_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
data[1] = inb(dev->iobase + PCL818_DO_DI_LSB_REG) |
(inb(dev->iobase + PCL818_DO_DI_MSB_REG) << 8);
return insn->n;
}
static int pcl818_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 & 0xff, dev->iobase + PCL818_DO_DI_LSB_REG);
outb((s->state >> 8), dev->iobase + PCL818_DO_DI_MSB_REG);
}
data[1] = s->state;
return insn->n;
}
static void pcl818_reset(struct comedi_device *dev)
{
const struct pcl818_board *board = dev->board_ptr;
unsigned int chan;
/* flush and disable the FIFO */
if (board->has_fifo) {
outb(0, dev->iobase + PCL818_FI_INTCLR);
outb(0, dev->iobase + PCL818_FI_FLUSH);
outb(0, dev->iobase + PCL818_FI_ENABLE);
}
/* disable analog input trigger */
outb(PCL818_CTRL_DISABLE_TRIG, dev->iobase + PCL818_CTRL_REG);
pcl818_ai_clear_eoc(dev);
pcl818_ai_set_chan_range(dev, 0, 0);
/* stop pacer */
outb(0, dev->iobase + PCL818_CNTENABLE_REG);
/* set analog output channels to 0V */
for (chan = 0; chan < board->n_aochan; chan++) {
outb(0, dev->iobase + PCL818_AO_LSB_REG(chan));
outb(0, dev->iobase + PCL818_AO_MSB_REG(chan));
}
/* set all digital outputs low */
outb(0, dev->iobase + PCL818_DO_DI_MSB_REG);
outb(0, dev->iobase + PCL818_DO_DI_LSB_REG);
}
static void pcl818_set_ai_range_table(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_devconfig *it)
{
const struct pcl818_board *board = dev->board_ptr;
/* default to the range table from the boardinfo */
s->range_table = board->ai_range_type;
/* now check the user config option based on the boardtype */
if (board->is_818) {
if (it->options[4] == 1 || it->options[4] == 10) {
/* secondary range list jumper selectable */
s->range_table = &range_pcl818l_h_ai;
}
} else {
switch (it->options[4]) {
case 0:
s->range_table = &range_bipolar10;
break;
case 1:
s->range_table = &range_bipolar5;
break;
case 2:
s->range_table = &range_bipolar2_5;
break;
case 3:
s->range_table = &range718_bipolar1;
break;
case 4:
s->range_table = &range718_bipolar0_5;
break;
case 6:
s->range_table = &range_unipolar10;
break;
case 7:
s->range_table = &range_unipolar5;
break;
case 8:
s->range_table = &range718_unipolar2;
break;
case 9:
s->range_table = &range718_unipolar1;
break;
default:
s->range_table = &range_unknown;
break;
}
}
}
static void pcl818_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
{
struct pcl818_private *devpriv = dev->private;
/* only DMA channels 3 and 1 are valid */
if (!(dma_chan == 3 || dma_chan == 1))
return;
/* DMA uses two 16K buffers */
devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
PAGE_SIZE * 4, COMEDI_ISADMA_READ);
}
static void pcl818_free_dma(struct comedi_device *dev)
{
struct pcl818_private *devpriv = dev->private;
if (devpriv)
comedi_isadma_free(devpriv->dma);
}
static int pcl818_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct pcl818_board *board = dev->board_ptr;
struct pcl818_private *devpriv;
struct comedi_subdevice *s;
unsigned int osc_base;
int ret;
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
ret = comedi_request_region(dev, it->options[0],
board->has_fifo ? 0x20 : 0x10);
if (ret)
return ret;
/* we can use IRQ 2-7 for async command support */
if (it->options[1] >= 2 && it->options[1] <= 7) {
ret = request_irq(it->options[1], pcl818_interrupt, 0,
dev->board_name, dev);
if (ret == 0)
dev->irq = it->options[1];
}
/* should we use the FIFO? */
if (dev->irq && board->has_fifo && it->options[2] == -1)
devpriv->usefifo = 1;
/* we need an IRQ to do DMA on channel 3 or 1 */
if (dev->irq && board->has_dma)
pcl818_alloc_dma(dev, it->options[2]);
/* use 1MHz or 10MHz oscilator */
if ((it->options[3] == 0) || (it->options[3] == 10))
osc_base = I8254_OSC_BASE_10MHZ;
else
osc_base = I8254_OSC_BASE_1MHZ;
dev->pacer = comedi_8254_io_alloc(dev->iobase + PCL818_TIMER_BASE,
osc_base, I8254_IO8, 0);
if (IS_ERR(dev->pacer))
return PTR_ERR(dev->pacer);
/* max sampling speed */
devpriv->ns_min = board->ns_min;
if (!board->is_818) {
/* extended PCL718 to 100kHz DAC */
if ((it->options[6] == 1) || (it->options[6] == 100))
devpriv->ns_min = 10000;
}
ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE;
if (check_single_ended(dev->iobase)) {
s->n_chan = 16;
s->subdev_flags |= SDF_COMMON | SDF_GROUND;
} else {
s->n_chan = 8;
s->subdev_flags |= SDF_DIFF;
}
s->maxdata = 0x0fff;
pcl818_set_ai_range_table(dev, s, it);
s->insn_read = pcl818_ai_insn_read;
if (dev->irq) {
dev->read_subdev = s;
s->subdev_flags |= SDF_CMD_READ;
s->len_chanlist = s->n_chan;
s->do_cmdtest = ai_cmdtest;
s->do_cmd = pcl818_ai_cmd;
s->cancel = pcl818_ai_cancel;
}
/* Analog Output subdevice */
s = &dev->subdevices[1];
if (board->n_aochan) {
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE | SDF_GROUND;
s->n_chan = board->n_aochan;
s->maxdata = 0x0fff;
s->range_table = &range_unipolar5;
if (board->is_818) {
if ((it->options[4] == 1) || (it->options[4] == 10))
s->range_table = &range_unipolar10;
if (it->options[4] == 2)
s->range_table = &range_unknown;
} else {
if ((it->options[5] == 1) || (it->options[5] == 10))
s->range_table = &range_unipolar10;
if (it->options[5] == 2)
s->range_table = &range_unknown;
}
s->insn_write = pcl818_ao_insn_write;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
/* Digital Input subdevice */
s = &dev->subdevices[2];
s->type = COMEDI_SUBD_DI;
s->subdev_flags = SDF_READABLE;
s->n_chan = 16;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = pcl818_di_insn_bits;
/* Digital Output subdevice */
s = &dev->subdevices[3];
s->type = COMEDI_SUBD_DO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = 16;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = pcl818_do_insn_bits;
pcl818_reset(dev);
return 0;
}
static void pcl818_detach(struct comedi_device *dev)
{
struct pcl818_private *devpriv = dev->private;
if (devpriv) {
pcl818_ai_cancel(dev, dev->read_subdev);
pcl818_reset(dev);
}
pcl818_free_dma(dev);
comedi_legacy_detach(dev);
}
static struct comedi_driver pcl818_driver = {
.driver_name = "pcl818",
.module = THIS_MODULE,
.attach = pcl818_attach,
.detach = pcl818_detach,
.board_name = &boardtypes[0].name,
.num_names = ARRAY_SIZE(boardtypes),
.offset = sizeof(struct pcl818_board),
};
module_comedi_driver(pcl818_driver);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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