// SPDX-License-Identifier: GPL-2.0+
/*
* dt282x.c
* Comedi driver for Data Translation DT2821 series
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 1997-8 David A. Schleef <[email protected]>
*/
/*
* Driver: dt282x
* Description: Data Translation DT2821 series (including DT-EZ)
* Author: ds
* Devices: [Data Translation] DT2821 (dt2821), DT2821-F-16SE (dt2821-f),
* DT2821-F-8DI (dt2821-f), DT2821-G-16SE (dt2821-g),
* DT2821-G-8DI (dt2821-g), DT2823 (dt2823), DT2824-PGH (dt2824-pgh),
* DT2824-PGL (dt2824-pgl), DT2825 (dt2825), DT2827 (dt2827),
* DT2828 (dt2828), DT2928 (dt2829), DT21-EZ (dt21-ez), DT23-EZ (dt23-ez),
* DT24-EZ (dt24-ez), DT24-EZ-PGL (dt24-ez-pgl)
* Status: complete
* Updated: Wed, 22 Aug 2001 17:11:34 -0700
*
* Configuration options:
* [0] - I/O port base address
* [1] - IRQ (optional, required for async command support)
* [2] - DMA 1 (optional, required for async command support)
* [3] - DMA 2 (optional, required for async command support)
* [4] - AI jumpered for 0=single ended, 1=differential
* [5] - AI jumpered for 0=straight binary, 1=2's complement
* [6] - AO 0 data format (deprecated, see below)
* [7] - AO 1 data format (deprecated, see below)
* [8] - AI jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5]
* [9] - AO channel 0 range (deprecated, see below)
* [10]- AO channel 1 range (deprecated, see below)
*
* Notes:
* - AO commands might be broken.
* - If you try to run a command on both the AI and AO subdevices
* simultaneously, bad things will happen. The driver needs to
* be fixed to check for this situation and return an error.
* - AO range is not programmable. The AO subdevice has a range_table
* containing all the possible analog output ranges. Use the range
* that matches your board configuration to convert between data
* values and physical units. The format of the data written to the
* board is handled automatically based on the unipolar/bipolar
* range that is selected.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/comedi/comedidev.h>
#include <linux/comedi/comedi_isadma.h>
/*
* Register map
*/
#define DT2821_ADCSR_REG 0x00
#define DT2821_ADCSR_ADERR BIT(15)
#define DT2821_ADCSR_ADCLK BIT(9)
#define DT2821_ADCSR_MUXBUSY BIT(8)
#define DT2821_ADCSR_ADDONE BIT(7)
#define DT2821_ADCSR_IADDONE BIT(6)
#define DT2821_ADCSR_GS(x) (((x) & 0x3) << 4)
#define DT2821_ADCSR_CHAN(x) (((x) & 0xf) << 0)
#define DT2821_CHANCSR_REG 0x02
#define DT2821_CHANCSR_LLE BIT(15)
#define DT2821_CHANCSR_TO_PRESLA(x) (((x) >> 8) & 0xf)
#define DT2821_CHANCSR_NUMB(x) ((((x) - 1) & 0xf) << 0)
#define DT2821_ADDAT_REG 0x04
#define DT2821_DACSR_REG 0x06
#define DT2821_DACSR_DAERR BIT(15)
#define DT2821_DACSR_YSEL(x) ((x) << 9)
#define DT2821_DACSR_SSEL BIT(8)
#define DT2821_DACSR_DACRDY BIT(7)
#define DT2821_DACSR_IDARDY BIT(6)
#define DT2821_DACSR_DACLK BIT(5)
#define DT2821_DACSR_HBOE BIT(1)
#define DT2821_DACSR_LBOE BIT(0)
#define DT2821_DADAT_REG 0x08
#define DT2821_DIODAT_REG 0x0a
#define DT2821_SUPCSR_REG 0x0c
#define DT2821_SUPCSR_DMAD BIT(15)
#define DT2821_SUPCSR_ERRINTEN BIT(14)
#define DT2821_SUPCSR_CLRDMADNE BIT(13)
#define DT2821_SUPCSR_DDMA BIT(12)
#define DT2821_SUPCSR_DS(x) (((x) & 0x3) << 10)
#define DT2821_SUPCSR_DS_PIO DT2821_SUPCSR_DS(0)
#define DT2821_SUPCSR_DS_AD_CLK DT2821_SUPCSR_DS(1)
#define DT2821_SUPCSR_DS_DA_CLK DT2821_SUPCSR_DS(2)
#define DT2821_SUPCSR_DS_AD_TRIG DT2821_SUPCSR_DS(3)
#define DT2821_SUPCSR_BUFFB BIT(9)
#define DT2821_SUPCSR_SCDN BIT(8)
#define DT2821_SUPCSR_DACON BIT(7)
#define DT2821_SUPCSR_ADCINIT BIT(6)
#define DT2821_SUPCSR_DACINIT BIT(5)
#define DT2821_SUPCSR_PRLD BIT(4)
#define DT2821_SUPCSR_STRIG BIT(3)
#define DT2821_SUPCSR_XTRIG BIT(2)
#define DT2821_SUPCSR_XCLK BIT(1)
#define DT2821_SUPCSR_BDINIT BIT(0)
#define DT2821_TMRCTR_REG 0x0e
#define DT2821_TMRCTR_PRESCALE(x) (((x) & 0xf) << 8)
#define DT2821_TMRCTR_DIVIDER(x) ((255 - ((x) & 0xff)) << 0)
/* Pacer Clock */
#define DT2821_OSC_BASE 250 /* 4 MHz (in nanoseconds) */
#define DT2821_PRESCALE(x) BIT(x)
#define DT2821_PRESCALE_MAX 15
#define DT2821_DIVIDER_MAX 255
#define DT2821_OSC_MAX (DT2821_OSC_BASE * \
DT2821_PRESCALE(DT2821_PRESCALE_MAX) * \
DT2821_DIVIDER_MAX)
static const struct comedi_lrange range_dt282x_ai_lo_bipolar = {
4, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25)
}
};
static const struct comedi_lrange range_dt282x_ai_lo_unipolar = {
4, {
UNI_RANGE(10),
UNI_RANGE(5),
UNI_RANGE(2.5),
UNI_RANGE(1.25)
}
};
static const struct comedi_lrange range_dt282x_ai_5_bipolar = {
4, {
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25),
BIP_RANGE(0.625)
}
};
static const struct comedi_lrange range_dt282x_ai_5_unipolar = {
4, {
UNI_RANGE(5),
UNI_RANGE(2.5),
UNI_RANGE(1.25),
UNI_RANGE(0.625)
}
};
static const struct comedi_lrange range_dt282x_ai_hi_bipolar = {
4, {
BIP_RANGE(10),
BIP_RANGE(1),
BIP_RANGE(0.1),
BIP_RANGE(0.02)
}
};
static const struct comedi_lrange range_dt282x_ai_hi_unipolar = {
4, {
UNI_RANGE(10),
UNI_RANGE(1),
UNI_RANGE(0.1),
UNI_RANGE(0.02)
}
};
/*
* The Analog Output range is set per-channel using jumpers on the board.
* All of these ranges may not be available on some DT2821 series boards.
* The default jumper setting has both channels set for +/-10V output.
*/
static const struct comedi_lrange dt282x_ao_range = {
5, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(2.5),
UNI_RANGE(10),
UNI_RANGE(5),
}
};
struct dt282x_board {
const char *name;
unsigned int ai_maxdata;
int adchan_se;
int adchan_di;
int ai_speed;
int ispgl;
int dachan;
unsigned int ao_maxdata;
};
static const struct dt282x_board boardtypes[] = {
{
.name = "dt2821",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 20000,
.dachan = 2,
.ao_maxdata = 0x0fff,
}, {
.name = "dt2821-f",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 6500,
.dachan = 2,
.ao_maxdata = 0x0fff,
}, {
.name = "dt2821-g",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 4000,
.dachan = 2,
.ao_maxdata = 0x0fff,
}, {
.name = "dt2823",
.ai_maxdata = 0xffff,
.adchan_di = 4,
.ai_speed = 10000,
.dachan = 2,
.ao_maxdata = 0xffff,
}, {
.name = "dt2824-pgh",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 20000,
}, {
.name = "dt2824-pgl",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 20000,
.ispgl = 1,
}, {
.name = "dt2825",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 20000,
.ispgl = 1,
.dachan = 2,
.ao_maxdata = 0x0fff,
}, {
.name = "dt2827",
.ai_maxdata = 0xffff,
.adchan_di = 4,
.ai_speed = 10000,
.dachan = 2,
.ao_maxdata = 0x0fff,
}, {
.name = "dt2828",
.ai_maxdata = 0x0fff,
.adchan_se = 4,
.ai_speed = 10000,
.dachan = 2,
.ao_maxdata = 0x0fff,
}, {
.name = "dt2829",
.ai_maxdata = 0xffff,
.adchan_se = 8,
.ai_speed = 33250,
.dachan = 2,
.ao_maxdata = 0xffff,
}, {
.name = "dt21-ez",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 10000,
.dachan = 2,
.ao_maxdata = 0x0fff,
}, {
.name = "dt23-ez",
.ai_maxdata = 0xffff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 10000,
}, {
.name = "dt24-ez",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 10000,
}, {
.name = "dt24-ez-pgl",
.ai_maxdata = 0x0fff,
.adchan_se = 16,
.adchan_di = 8,
.ai_speed = 10000,
.ispgl = 1,
},
};
struct dt282x_private {
struct comedi_isadma *dma;
unsigned int ad_2scomp:1;
unsigned int divisor;
int dacsr; /* software copies of registers */
int adcsr;
int supcsr;
int ntrig;
int nread;
int dma_dir;
};
static int dt282x_prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc = &dma->desc[dma_index];
if (!devpriv->ntrig)
return 0;
if (n == 0)
n = desc->maxsize;
if (n > devpriv->ntrig * 2)
n = devpriv->ntrig * 2;
devpriv->ntrig -= n / 2;
desc->size = n;
comedi_isadma_set_mode(desc, devpriv->dma_dir);
comedi_isadma_program(desc);
return n;
}
static int dt282x_prep_ao_dma(struct comedi_device *dev, int dma_index, int n)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc = &dma->desc[dma_index];
desc->size = n;
comedi_isadma_set_mode(desc, devpriv->dma_dir);
comedi_isadma_program(desc);
return n;
}
static void dt282x_disable_dma(struct comedi_device *dev)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc;
int i;
for (i = 0; i < 2; i++) {
desc = &dma->desc[i];
comedi_isadma_disable(desc->chan);
}
}
static unsigned int dt282x_ns_to_timer(unsigned int *ns, unsigned int flags)
{
unsigned int prescale, base, divider;
for (prescale = 0; prescale <= DT2821_PRESCALE_MAX; prescale++) {
if (prescale == 1) /* 0 and 1 are both divide by 1 */
continue;
base = DT2821_OSC_BASE * DT2821_PRESCALE(prescale);
switch (flags & CMDF_ROUND_MASK) {
case CMDF_ROUND_NEAREST:
default:
divider = DIV_ROUND_CLOSEST(*ns, base);
break;
case CMDF_ROUND_DOWN:
divider = (*ns) / base;
break;
case CMDF_ROUND_UP:
divider = DIV_ROUND_UP(*ns, base);
break;
}
if (divider <= DT2821_DIVIDER_MAX)
break;
}
if (divider > DT2821_DIVIDER_MAX) {
prescale = DT2821_PRESCALE_MAX;
divider = DT2821_DIVIDER_MAX;
base = DT2821_OSC_BASE * DT2821_PRESCALE(prescale);
}
*ns = divider * base;
return DT2821_TMRCTR_PRESCALE(prescale) |
DT2821_TMRCTR_DIVIDER(divider);
}
static void dt282x_munge(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned short *buf,
unsigned int nbytes)
{
struct dt282x_private *devpriv = dev->private;
unsigned int val;
int i;
if (nbytes % 2)
dev_err(dev->class_dev,
"bug! odd number of bytes from dma xfer\n");
for (i = 0; i < nbytes / 2; i++) {
val = buf[i];
val &= s->maxdata;
if (devpriv->ad_2scomp)
val = comedi_offset_munge(s, val);
buf[i] = val;
}
}
static unsigned int dt282x_ao_setup_dma(struct comedi_device *dev,
struct comedi_subdevice *s,
int cur_dma)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc = &dma->desc[cur_dma];
unsigned int nsamples = comedi_bytes_to_samples(s, desc->maxsize);
unsigned int nbytes;
nbytes = comedi_buf_read_samples(s, desc->virt_addr, nsamples);
if (nbytes)
dt282x_prep_ao_dma(dev, cur_dma, nbytes);
else
dev_err(dev->class_dev, "AO underrun\n");
return nbytes;
}
static void dt282x_ao_dma_interrupt(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
dev->iobase + DT2821_SUPCSR_REG);
comedi_isadma_disable(desc->chan);
if (!dt282x_ao_setup_dma(dev, s, dma->cur_dma))
s->async->events |= COMEDI_CB_OVERFLOW;
dma->cur_dma = 1 - dma->cur_dma;
}
static void dt282x_ai_dma_interrupt(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
unsigned int nsamples = comedi_bytes_to_samples(s, desc->size);
int ret;
outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
dev->iobase + DT2821_SUPCSR_REG);
comedi_isadma_disable(desc->chan);
dt282x_munge(dev, s, desc->virt_addr, desc->size);
ret = comedi_buf_write_samples(s, desc->virt_addr, nsamples);
if (ret != desc->size)
return;
devpriv->nread -= nsamples;
if (devpriv->nread < 0) {
dev_info(dev->class_dev, "nread off by one\n");
devpriv->nread = 0;
}
if (!devpriv->nread) {
s->async->events |= COMEDI_CB_EOA;
return;
}
/* restart the channel */
dt282x_prep_ai_dma(dev, dma->cur_dma, 0);
dma->cur_dma = 1 - dma->cur_dma;
}
static irqreturn_t dt282x_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct dt282x_private *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_subdevice *s_ao = dev->write_subdev;
unsigned int supcsr, adcsr, dacsr;
int handled = 0;
if (!dev->attached) {
dev_err(dev->class_dev, "spurious interrupt\n");
return IRQ_HANDLED;
}
adcsr = inw(dev->iobase + DT2821_ADCSR_REG);
dacsr = inw(dev->iobase + DT2821_DACSR_REG);
supcsr = inw(dev->iobase + DT2821_SUPCSR_REG);
if (supcsr & DT2821_SUPCSR_DMAD) {
if (devpriv->dma_dir == COMEDI_ISADMA_READ)
dt282x_ai_dma_interrupt(dev, s);
else
dt282x_ao_dma_interrupt(dev, s_ao);
handled = 1;
}
if (adcsr & DT2821_ADCSR_ADERR) {
if (devpriv->nread != 0) {
dev_err(dev->class_dev, "A/D error\n");
s->async->events |= COMEDI_CB_ERROR;
}
handled = 1;
}
if (dacsr & DT2821_DACSR_DAERR) {
dev_err(dev->class_dev, "D/A error\n");
s_ao->async->events |= COMEDI_CB_ERROR;
handled = 1;
}
comedi_handle_events(dev, s);
if (s_ao)
comedi_handle_events(dev, s_ao);
return IRQ_RETVAL(handled);
}
static void dt282x_load_changain(struct comedi_device *dev, int n,
unsigned int *chanlist)
{
struct dt282x_private *devpriv = dev->private;
int i;
outw(DT2821_CHANCSR_LLE | DT2821_CHANCSR_NUMB(n),
dev->iobase + DT2821_CHANCSR_REG);
for (i = 0; i < n; i++) {
unsigned int chan = CR_CHAN(chanlist[i]);
unsigned int range = CR_RANGE(chanlist[i]);
outw(devpriv->adcsr |
DT2821_ADCSR_GS(range) |
DT2821_ADCSR_CHAN(chan),
dev->iobase + DT2821_ADCSR_REG);
}
outw(DT2821_CHANCSR_NUMB(n), dev->iobase + DT2821_CHANCSR_REG);
}
static int dt282x_ai_timeout(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
unsigned int status;
status = inw(dev->iobase + DT2821_ADCSR_REG);
switch (context) {
case DT2821_ADCSR_MUXBUSY:
if ((status & DT2821_ADCSR_MUXBUSY) == 0)
return 0;
break;
case DT2821_ADCSR_ADDONE:
if (status & DT2821_ADCSR_ADDONE)
return 0;
break;
default:
return -EINVAL;
}
return -EBUSY;
}
/*
* Performs a single A/D conversion.
* - Put channel/gain into channel-gain list
* - preload multiplexer
* - trigger conversion and wait for it to finish
*/
static int dt282x_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct dt282x_private *devpriv = dev->private;
unsigned int val;
int ret;
int i;
/* XXX should we really be enabling the ad clock here? */
devpriv->adcsr = DT2821_ADCSR_ADCLK;
outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
dt282x_load_changain(dev, 1, &insn->chanspec);
outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
dev->iobase + DT2821_SUPCSR_REG);
ret = comedi_timeout(dev, s, insn,
dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
if (ret)
return ret;
for (i = 0; i < insn->n; i++) {
outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
dev->iobase + DT2821_SUPCSR_REG);
ret = comedi_timeout(dev, s, insn,
dt282x_ai_timeout, DT2821_ADCSR_ADDONE);
if (ret)
return ret;
val = inw(dev->iobase + DT2821_ADDAT_REG);
val &= s->maxdata;
if (devpriv->ad_2scomp)
val = comedi_offset_munge(s, val);
data[i] = val;
}
return i;
}
static int dt282x_ai_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
const struct dt282x_board *board = dev->board_ptr;
struct dt282x_private *devpriv = dev->private;
int err = 0;
unsigned int arg;
/* 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 | TRIG_EXT);
err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
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->scan_begin_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);
err |= comedi_check_trigger_arg_max(&cmd->convert_arg, DT2821_OSC_MAX);
err |= comedi_check_trigger_arg_min(&cmd->convert_arg, board->ai_speed);
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_EXT | TRIG_NONE */
err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
if (err)
return 3;
/* step 4: fix up any arguments */
arg = cmd->convert_arg;
devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
if (err)
return 4;
return 0;
}
static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_cmd *cmd = &s->async->cmd;
int ret;
dt282x_disable_dma(dev);
outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
devpriv->supcsr = DT2821_SUPCSR_ERRINTEN;
if (cmd->scan_begin_src == TRIG_FOLLOW)
devpriv->supcsr = DT2821_SUPCSR_DS_AD_CLK;
else
devpriv->supcsr = DT2821_SUPCSR_DS_AD_TRIG;
outw(devpriv->supcsr |
DT2821_SUPCSR_CLRDMADNE |
DT2821_SUPCSR_BUFFB |
DT2821_SUPCSR_ADCINIT,
dev->iobase + DT2821_SUPCSR_REG);
devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg;
devpriv->nread = devpriv->ntrig;
devpriv->dma_dir = COMEDI_ISADMA_READ;
dma->cur_dma = 0;
dt282x_prep_ai_dma(dev, 0, 0);
if (devpriv->ntrig) {
dt282x_prep_ai_dma(dev, 1, 0);
devpriv->supcsr |= DT2821_SUPCSR_DDMA;
outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
}
devpriv->adcsr = 0;
dt282x_load_changain(dev, cmd->chanlist_len, cmd->chanlist);
devpriv->adcsr = DT2821_ADCSR_ADCLK | DT2821_ADCSR_IADDONE;
outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
dev->iobase + DT2821_SUPCSR_REG);
ret = comedi_timeout(dev, s, NULL,
dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
if (ret)
return ret;
if (cmd->scan_begin_src == TRIG_FOLLOW) {
outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
dev->iobase + DT2821_SUPCSR_REG);
} else {
devpriv->supcsr |= DT2821_SUPCSR_XTRIG;
outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
}
return 0;
}
static int dt282x_ai_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct dt282x_private *devpriv = dev->private;
dt282x_disable_dma(dev);
devpriv->adcsr = 0;
outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
devpriv->supcsr = 0;
outw(devpriv->supcsr | DT2821_SUPCSR_ADCINIT,
dev->iobase + DT2821_SUPCSR_REG);
return 0;
}
static int dt282x_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct dt282x_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int range = CR_RANGE(insn->chanspec);
int i;
devpriv->dacsr |= DT2821_DACSR_SSEL | DT2821_DACSR_YSEL(chan);
for (i = 0; i < insn->n; i++) {
unsigned int val = data[i];
s->readback[chan] = val;
if (comedi_range_is_bipolar(s, range))
val = comedi_offset_munge(s, val);
outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
outw(val, dev->iobase + DT2821_DADAT_REG);
outw(devpriv->supcsr | DT2821_SUPCSR_DACON,
dev->iobase + DT2821_SUPCSR_REG);
}
return insn->n;
}
static int dt282x_ao_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
struct dt282x_private *devpriv = dev->private;
int err = 0;
unsigned int arg;
/* Step 1 : check if triggers are trivially valid */
err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT);
err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
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->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_min(&cmd->scan_begin_arg, 5000);
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_EXT | TRIG_NONE */
err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
if (err)
return 3;
/* step 4: fix up any arguments */
arg = cmd->scan_begin_arg;
devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
if (err)
return 4;
return 0;
}
static int dt282x_ao_inttrig(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int trig_num)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
if (trig_num != cmd->start_src)
return -EINVAL;
if (!dt282x_ao_setup_dma(dev, s, 0))
return -EPIPE;
if (!dt282x_ao_setup_dma(dev, s, 1))
return -EPIPE;
outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
dev->iobase + DT2821_SUPCSR_REG);
s->async->inttrig = NULL;
return 1;
}
static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct dt282x_private *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_cmd *cmd = &s->async->cmd;
dt282x_disable_dma(dev);
devpriv->supcsr = DT2821_SUPCSR_ERRINTEN |
DT2821_SUPCSR_DS_DA_CLK |
DT2821_SUPCSR_DDMA;
outw(devpriv->supcsr |
DT2821_SUPCSR_CLRDMADNE |
DT2821_SUPCSR_BUFFB |
DT2821_SUPCSR_DACINIT,
dev->iobase + DT2821_SUPCSR_REG);
devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len;
devpriv->nread = devpriv->ntrig;
devpriv->dma_dir = COMEDI_ISADMA_WRITE;
dma->cur_dma = 0;
outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
/* clear all bits but the DIO direction bits */
devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
devpriv->dacsr |= (DT2821_DACSR_SSEL |
DT2821_DACSR_DACLK |
DT2821_DACSR_IDARDY);
outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
s->async->inttrig = dt282x_ao_inttrig;
return 0;
}
static int dt282x_ao_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct dt282x_private *devpriv = dev->private;
dt282x_disable_dma(dev);
/* clear all bits but the DIO direction bits */
devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
devpriv->supcsr = 0;
outw(devpriv->supcsr | DT2821_SUPCSR_DACINIT,
dev->iobase + DT2821_SUPCSR_REG);
return 0;
}
static int dt282x_dio_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
if (comedi_dio_update_state(s, data))
outw(s->state, dev->iobase + DT2821_DIODAT_REG);
data[1] = inw(dev->iobase + DT2821_DIODAT_REG);
return insn->n;
}
static int dt282x_dio_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct dt282x_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int mask;
int ret;
if (chan < 8)
mask = 0x00ff;
else
mask = 0xff00;
ret = comedi_dio_insn_config(dev, s, insn, data, mask);
if (ret)
return ret;
devpriv->dacsr &= ~(DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
if (s->io_bits & 0x00ff)
devpriv->dacsr |= DT2821_DACSR_LBOE;
if (s->io_bits & 0xff00)
devpriv->dacsr |= DT2821_DACSR_HBOE;
outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
return insn->n;
}
static const struct comedi_lrange *const ai_range_table[] = {
&range_dt282x_ai_lo_bipolar,
&range_dt282x_ai_lo_unipolar,
&range_dt282x_ai_5_bipolar,
&range_dt282x_ai_5_unipolar
};
static const struct comedi_lrange *const ai_range_pgl_table[] = {
&range_dt282x_ai_hi_bipolar,
&range_dt282x_ai_hi_unipolar
};
static const struct comedi_lrange *opt_ai_range_lkup(int ispgl, int x)
{
if (ispgl) {
if (x < 0 || x >= 2)
x = 0;
return ai_range_pgl_table[x];
}
if (x < 0 || x >= 4)
x = 0;
return ai_range_table[x];
}
static void dt282x_alloc_dma(struct comedi_device *dev,
struct comedi_devconfig *it)
{
struct dt282x_private *devpriv = dev->private;
unsigned int irq_num = it->options[1];
unsigned int dma_chan[2];
if (it->options[2] < it->options[3]) {
dma_chan[0] = it->options[2];
dma_chan[1] = it->options[3];
} else {
dma_chan[0] = it->options[3];
dma_chan[1] = it->options[2];
}
if (!irq_num || dma_chan[0] == dma_chan[1] ||
dma_chan[0] < 5 || dma_chan[0] > 7 ||
dma_chan[1] < 5 || dma_chan[1] > 7)
return;
if (request_irq(irq_num, dt282x_interrupt, 0, dev->board_name, dev))
return;
/* DMA uses two 4K buffers with separate DMA channels */
devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan[0], dma_chan[1],
PAGE_SIZE, 0);
if (!devpriv->dma)
free_irq(irq_num, dev);
else
dev->irq = irq_num;
}
static void dt282x_free_dma(struct comedi_device *dev)
{
struct dt282x_private *devpriv = dev->private;
if (devpriv)
comedi_isadma_free(devpriv->dma);
}
static int dt282x_initialize(struct comedi_device *dev)
{
/* Initialize board */
outw(DT2821_SUPCSR_BDINIT, dev->iobase + DT2821_SUPCSR_REG);
inw(dev->iobase + DT2821_ADCSR_REG);
/*
* At power up, some registers are in a well-known state.
* Check them to see if a DT2821 series board is present.
*/
if (((inw(dev->iobase + DT2821_ADCSR_REG) & 0xfff0) != 0x7c00) ||
((inw(dev->iobase + DT2821_CHANCSR_REG) & 0xf0f0) != 0x70f0) ||
((inw(dev->iobase + DT2821_DACSR_REG) & 0x7c93) != 0x7c90) ||
((inw(dev->iobase + DT2821_SUPCSR_REG) & 0xf8ff) != 0x0000) ||
((inw(dev->iobase + DT2821_TMRCTR_REG) & 0xff00) != 0xf000)) {
dev_err(dev->class_dev, "board not found\n");
return -EIO;
}
return 0;
}
static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct dt282x_board *board = dev->board_ptr;
struct dt282x_private *devpriv;
struct comedi_subdevice *s;
int ret;
ret = comedi_request_region(dev, it->options[0], 0x10);
if (ret)
return ret;
ret = dt282x_initialize(dev);
if (ret)
return ret;
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
/* an IRQ and 2 DMA channels are required for async command support */
dt282x_alloc_dma(dev, it);
ret = comedi_alloc_subdevices(dev, 3);
if (ret)
return ret;
/* Analog Input subdevice */
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE;
if ((it->options[4] && board->adchan_di) || board->adchan_se == 0) {
s->subdev_flags |= SDF_DIFF;
s->n_chan = board->adchan_di;
} else {
s->subdev_flags |= SDF_COMMON;
s->n_chan = board->adchan_se;
}
s->maxdata = board->ai_maxdata;
s->range_table = opt_ai_range_lkup(board->ispgl, it->options[8]);
devpriv->ad_2scomp = it->options[5] ? 1 : 0;
s->insn_read = dt282x_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 = dt282x_ai_cmdtest;
s->do_cmd = dt282x_ai_cmd;
s->cancel = dt282x_ai_cancel;
}
/* Analog Output subdevice */
s = &dev->subdevices[1];
if (board->dachan) {
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = board->dachan;
s->maxdata = board->ao_maxdata;
/* ranges are per-channel, set by jumpers on the board */
s->range_table = &dt282x_ao_range;
s->insn_write = dt282x_ao_insn_write;
if (dev->irq) {
dev->write_subdev = s;
s->subdev_flags |= SDF_CMD_WRITE;
s->len_chanlist = s->n_chan;
s->do_cmdtest = dt282x_ao_cmdtest;
s->do_cmd = dt282x_ao_cmd;
s->cancel = dt282x_ao_cancel;
}
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
/* Digital I/O subdevice */
s = &dev->subdevices[2];
s->type = COMEDI_SUBD_DIO;
s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
s->n_chan = 16;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = dt282x_dio_insn_bits;
s->insn_config = dt282x_dio_insn_config;
return 0;
}
static void dt282x_detach(struct comedi_device *dev)
{
dt282x_free_dma(dev);
comedi_legacy_detach(dev);
}
static struct comedi_driver dt282x_driver = {
.driver_name = "dt282x",
.module = THIS_MODULE,
.attach = dt282x_attach,
.detach = dt282x_detach,
.board_name = &boardtypes[0].name,
.num_names = ARRAY_SIZE(boardtypes),
.offset = sizeof(struct dt282x_board),
};
module_comedi_driver(dt282x_driver);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for Data Translation DT2821 series");
MODULE_LICENSE("GPL");
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