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JustOS/linux-6.13/drivers/comedi/drivers/das16.c
justuser 02e73b8cd9 up
2025-01-24 17:00:19 +03:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* das16.c
* DAS16 driver
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 2000 David A. Schleef <ds@schleef.org>
* Copyright (C) 2000 Chris R. Baugher <baugher@enteract.com>
* Copyright (C) 2001,2002 Frank Mori Hess <fmhess@users.sourceforge.net>
*/
/*
* Driver: das16
* Description: DAS16 compatible boards
* Author: Sam Moore, Warren Jasper, ds, Chris Baugher, Frank Hess, Roman Fietze
* Devices: [Keithley Metrabyte] DAS-16 (das-16), DAS-16G (das-16g),
* DAS-16F (das-16f), DAS-1201 (das-1201), DAS-1202 (das-1202),
* DAS-1401 (das-1401), DAS-1402 (das-1402), DAS-1601 (das-1601),
* DAS-1602 (das-1602),
* [ComputerBoards] PC104-DAS16/JR (pc104-das16jr),
* PC104-DAS16JR/16 (pc104-das16jr/16), CIO-DAS16 (cio-das16),
* CIO-DAS16F (cio-das16/f), CIO-DAS16/JR (cio-das16/jr),
* CIO-DAS16JR/16 (cio-das16jr/16), CIO-DAS1401/12 (cio-das1401/12),
* CIO-DAS1402/12 (cio-das1402/12), CIO-DAS1402/16 (cio-das1402/16),
* CIO-DAS1601/12 (cio-das1601/12), CIO-DAS1602/12 (cio-das1602/12),
* CIO-DAS1602/16 (cio-das1602/16), CIO-DAS16/330 (cio-das16/330)
* Status: works
* Updated: 2003-10-12
*
* A rewrite of the das16 and das1600 drivers.
*
* Options:
* [0] - base io address
* [1] - irq (does nothing, irq is not used anymore)
* [2] - dma channel (optional, required for comedi_command support)
* [3] - master clock speed in MHz (optional, 1 or 10, ignored if
* board can probe clock, defaults to 1)
* [4] - analog input range lowest voltage in microvolts (optional,
* only useful if your board does not have software
* programmable gain)
* [5] - analog input range highest voltage in microvolts (optional,
* only useful if board does not have software programmable
* gain)
* [6] - analog output range lowest voltage in microvolts (optional)
* [7] - analog output range highest voltage in microvolts (optional)
*
* Passing a zero for an option is the same as leaving it unspecified.
*/
/*
* Testing and debugging help provided by Daniel Koch.
*
* Keithley Manuals:
* 2309.PDF (das16)
* 4919.PDF (das1400, 1600)
* 4922.PDF (das-1400)
* 4923.PDF (das1200, 1400, 1600)
*
* Computer boards manuals also available from their website
* www.measurementcomputing.com
*/
#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>
#include <linux/comedi/comedi_isadma.h>
#define DAS16_DMA_SIZE 0xff00 /* size in bytes of allocated dma buffer */
/*
* Register I/O map
*/
#define DAS16_TRIG_REG 0x00
#define DAS16_AI_LSB_REG 0x00
#define DAS16_AI_MSB_REG 0x01
#define DAS16_MUX_REG 0x02
#define DAS16_DIO_REG 0x03
#define DAS16_AO_LSB_REG(x) ((x) ? 0x06 : 0x04)
#define DAS16_AO_MSB_REG(x) ((x) ? 0x07 : 0x05)
#define DAS16_STATUS_REG 0x08
#define DAS16_STATUS_BUSY BIT(7)
#define DAS16_STATUS_UNIPOLAR BIT(6)
#define DAS16_STATUS_MUXBIT BIT(5)
#define DAS16_STATUS_INT BIT(4)
#define DAS16_CTRL_REG 0x09
#define DAS16_CTRL_INTE BIT(7)
#define DAS16_CTRL_IRQ(x) (((x) & 0x7) << 4)
#define DAS16_CTRL_DMAE BIT(2)
#define DAS16_CTRL_PACING_MASK (3 << 0)
#define DAS16_CTRL_INT_PACER (3 << 0)
#define DAS16_CTRL_EXT_PACER (2 << 0)
#define DAS16_CTRL_SOFT_PACER (0 << 0)
#define DAS16_PACER_REG 0x0a
#define DAS16_PACER_BURST_LEN(x) (((x) & 0xf) << 4)
#define DAS16_PACER_CTR0 BIT(1)
#define DAS16_PACER_TRIG0 BIT(0)
#define DAS16_GAIN_REG 0x0b
#define DAS16_TIMER_BASE_REG 0x0c /* to 0x0f */
#define DAS1600_CONV_REG 0x404
#define DAS1600_CONV_DISABLE BIT(6)
#define DAS1600_BURST_REG 0x405
#define DAS1600_BURST_VAL BIT(6)
#define DAS1600_ENABLE_REG 0x406
#define DAS1600_ENABLE_VAL BIT(6)
#define DAS1600_STATUS_REG 0x407
#define DAS1600_STATUS_BME BIT(6)
#define DAS1600_STATUS_ME BIT(5)
#define DAS1600_STATUS_CD BIT(4)
#define DAS1600_STATUS_WS BIT(1)
#define DAS1600_STATUS_CLK_10MHZ BIT(0)
static const struct comedi_lrange range_das1x01_bip = {
4, {
BIP_RANGE(10),
BIP_RANGE(1),
BIP_RANGE(0.1),
BIP_RANGE(0.01)
}
};
static const struct comedi_lrange range_das1x01_unip = {
4, {
UNI_RANGE(10),
UNI_RANGE(1),
UNI_RANGE(0.1),
UNI_RANGE(0.01)
}
};
static const struct comedi_lrange range_das1x02_bip = {
4, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25)
}
};
static const struct comedi_lrange range_das1x02_unip = {
4, {
UNI_RANGE(10),
UNI_RANGE(5),
UNI_RANGE(2.5),
UNI_RANGE(1.25)
}
};
static const struct comedi_lrange range_das16jr = {
9, {
BIP_RANGE(10),
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)
}
};
static const struct comedi_lrange range_das16jr_16 = {
8, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25),
UNI_RANGE(10),
UNI_RANGE(5),
UNI_RANGE(2.5),
UNI_RANGE(1.25)
}
};
static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 };
static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
static const int das1600_gainlist[] = { 0, 1, 2, 3 };
enum {
das16_pg_none = 0,
das16_pg_16jr,
das16_pg_16jr_16,
das16_pg_1601,
das16_pg_1602,
};
static const int *const das16_gainlists[] = {
NULL,
das16jr_gainlist,
das16jr_16_gainlist,
das1600_gainlist,
das1600_gainlist,
};
static const struct comedi_lrange *const das16_ai_uni_lranges[] = {
&range_unknown,
&range_das16jr,
&range_das16jr_16,
&range_das1x01_unip,
&range_das1x02_unip,
};
static const struct comedi_lrange *const das16_ai_bip_lranges[] = {
&range_unknown,
&range_das16jr,
&range_das16jr_16,
&range_das1x01_bip,
&range_das1x02_bip,
};
struct das16_board {
const char *name;
unsigned int ai_maxdata;
unsigned int ai_speed; /* max conversion speed in nanosec */
unsigned int ai_pg;
unsigned int has_ao:1;
unsigned int has_8255:1;
unsigned int i8255_offset;
unsigned int size;
unsigned int id;
};
static const struct das16_board das16_boards[] = {
{
.name = "das-16",
.ai_maxdata = 0x0fff,
.ai_speed = 15000,
.ai_pg = das16_pg_none,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x10,
.size = 0x14,
.id = 0x00,
}, {
.name = "das-16g",
.ai_maxdata = 0x0fff,
.ai_speed = 15000,
.ai_pg = das16_pg_none,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x10,
.size = 0x14,
.id = 0x00,
}, {
.name = "das-16f",
.ai_maxdata = 0x0fff,
.ai_speed = 8500,
.ai_pg = das16_pg_none,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x10,
.size = 0x14,
.id = 0x00,
}, {
.name = "cio-das16",
.ai_maxdata = 0x0fff,
.ai_speed = 20000,
.ai_pg = das16_pg_none,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x10,
.size = 0x14,
.id = 0x80,
}, {
.name = "cio-das16/f",
.ai_maxdata = 0x0fff,
.ai_speed = 10000,
.ai_pg = das16_pg_none,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x10,
.size = 0x14,
.id = 0x80,
}, {
.name = "cio-das16/jr",
.ai_maxdata = 0x0fff,
.ai_speed = 7692,
.ai_pg = das16_pg_16jr,
.size = 0x10,
.id = 0x00,
}, {
.name = "pc104-das16jr",
.ai_maxdata = 0x0fff,
.ai_speed = 3300,
.ai_pg = das16_pg_16jr,
.size = 0x10,
.id = 0x00,
}, {
.name = "cio-das16jr/16",
.ai_maxdata = 0xffff,
.ai_speed = 10000,
.ai_pg = das16_pg_16jr_16,
.size = 0x10,
.id = 0x00,
}, {
.name = "pc104-das16jr/16",
.ai_maxdata = 0xffff,
.ai_speed = 10000,
.ai_pg = das16_pg_16jr_16,
.size = 0x10,
.id = 0x00,
}, {
.name = "das-1201",
.ai_maxdata = 0x0fff,
.ai_speed = 20000,
.ai_pg = das16_pg_none,
.has_8255 = 1,
.i8255_offset = 0x400,
.size = 0x408,
.id = 0x20,
}, {
.name = "das-1202",
.ai_maxdata = 0x0fff,
.ai_speed = 10000,
.ai_pg = das16_pg_none,
.has_8255 = 1,
.i8255_offset = 0x400,
.size = 0x408,
.id = 0x20,
}, {
.name = "das-1401",
.ai_maxdata = 0x0fff,
.ai_speed = 10000,
.ai_pg = das16_pg_1601,
.size = 0x408,
.id = 0xc0,
}, {
.name = "das-1402",
.ai_maxdata = 0x0fff,
.ai_speed = 10000,
.ai_pg = das16_pg_1602,
.size = 0x408,
.id = 0xc0,
}, {
.name = "das-1601",
.ai_maxdata = 0x0fff,
.ai_speed = 10000,
.ai_pg = das16_pg_1601,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x400,
.size = 0x408,
.id = 0xc0,
}, {
.name = "das-1602",
.ai_maxdata = 0x0fff,
.ai_speed = 10000,
.ai_pg = das16_pg_1602,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x400,
.size = 0x408,
.id = 0xc0,
}, {
.name = "cio-das1401/12",
.ai_maxdata = 0x0fff,
.ai_speed = 6250,
.ai_pg = das16_pg_1601,
.size = 0x408,
.id = 0xc0,
}, {
.name = "cio-das1402/12",
.ai_maxdata = 0x0fff,
.ai_speed = 6250,
.ai_pg = das16_pg_1602,
.size = 0x408,
.id = 0xc0,
}, {
.name = "cio-das1402/16",
.ai_maxdata = 0xffff,
.ai_speed = 10000,
.ai_pg = das16_pg_1602,
.size = 0x408,
.id = 0xc0,
}, {
.name = "cio-das1601/12",
.ai_maxdata = 0x0fff,
.ai_speed = 6250,
.ai_pg = das16_pg_1601,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x400,
.size = 0x408,
.id = 0xc0,
}, {
.name = "cio-das1602/12",
.ai_maxdata = 0x0fff,
.ai_speed = 10000,
.ai_pg = das16_pg_1602,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x400,
.size = 0x408,
.id = 0xc0,
}, {
.name = "cio-das1602/16",
.ai_maxdata = 0xffff,
.ai_speed = 10000,
.ai_pg = das16_pg_1602,
.has_ao = 1,
.has_8255 = 1,
.i8255_offset = 0x400,
.size = 0x408,
.id = 0xc0,
}, {
.name = "cio-das16/330",
.ai_maxdata = 0x0fff,
.ai_speed = 3030,
.ai_pg = das16_pg_16jr,
.size = 0x14,
.id = 0xf0,
},
};
/*
* Period for timer interrupt in jiffies. It's a function
* to deal with possibility of dynamic HZ patches
*/
static inline int timer_period(void)
{
return HZ / 20;
}
struct das16_private_struct {
struct comedi_isadma *dma;
struct comedi_device *dev;
unsigned int clockbase;
unsigned int ctrl_reg;
unsigned int divisor1;
unsigned int divisor2;
struct timer_list timer;
unsigned long extra_iobase;
unsigned int can_burst:1;
unsigned int timer_running:1;
};
static void das16_ai_setup_dma(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int unread_samples)
{
struct das16_private_struct *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;
/*
* Determine dma size based on the buffer size 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 das16_interrupt(struct comedi_device *dev)
{
struct das16_private_struct *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
unsigned long spin_flags;
unsigned int residue;
unsigned int nbytes;
unsigned int nsamples;
spin_lock_irqsave(&dev->spinlock, spin_flags);
if (!(devpriv->ctrl_reg & DAS16_CTRL_DMAE)) {
spin_unlock_irqrestore(&dev->spinlock, spin_flags);
return;
}
/*
* The pc104-das16jr (at least) has problems if the dma
* transfer is interrupted in the middle of transferring
* a 16 bit sample.
*/
residue = comedi_isadma_disable_on_sample(desc->chan,
comedi_bytes_per_sample(s));
/* figure out how many samples to read */
if (residue > desc->size) {
dev_err(dev->class_dev, "residue > transfer size!\n");
async->events |= COMEDI_CB_ERROR;
nbytes = 0;
} else {
nbytes = desc->size - residue;
}
nsamples = comedi_bytes_to_samples(s, nbytes);
/* restart DMA if more samples are needed */
if (nsamples) {
dma->cur_dma = 1 - dma->cur_dma;
das16_ai_setup_dma(dev, s, nsamples);
}
spin_unlock_irqrestore(&dev->spinlock, spin_flags);
comedi_buf_write_samples(s, desc->virt_addr, nsamples);
if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg)
async->events |= COMEDI_CB_EOA;
comedi_handle_events(dev, s);
}
static void das16_timer_interrupt(struct timer_list *t)
{
struct das16_private_struct *devpriv = from_timer(devpriv, t, timer);
struct comedi_device *dev = devpriv->dev;
unsigned long flags;
das16_interrupt(dev);
spin_lock_irqsave(&dev->spinlock, flags);
if (devpriv->timer_running)
mod_timer(&devpriv->timer, jiffies + timer_period());
spin_unlock_irqrestore(&dev->spinlock, flags);
}
static void das16_ai_set_mux_range(struct comedi_device *dev,
unsigned int first_chan,
unsigned int last_chan,
unsigned int range)
{
const struct das16_board *board = dev->board_ptr;
/* set multiplexer */
outb(first_chan | (last_chan << 4), dev->iobase + DAS16_MUX_REG);
/* some boards do not have programmable gain */
if (board->ai_pg == das16_pg_none)
return;
/*
* Set gain (this is also burst rate register but according to
* computer boards manual, burst rate does nothing, even on
* keithley cards).
*/
outb((das16_gainlists[board->ai_pg])[range],
dev->iobase + DAS16_GAIN_REG);
}
static int das16_ai_check_chanlist(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
int i;
for (i = 1; i < cmd->chanlist_len; i++) {
unsigned int chan = CR_CHAN(cmd->chanlist[i]);
unsigned int range = CR_RANGE(cmd->chanlist[i]);
if (chan != ((chan0 + i) % s->n_chan)) {
dev_dbg(dev->class_dev,
"entries in chanlist must be consecutive channels, counting upwards\n");
return -EINVAL;
}
if (range != range0) {
dev_dbg(dev->class_dev,
"entries in chanlist must all have the same gain\n");
return -EINVAL;
}
}
return 0;
}
static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
const struct das16_board *board = dev->board_ptr;
struct das16_private_struct *devpriv = dev->private;
int err = 0;
unsigned int trig_mask;
unsigned int arg;
/* Step 1 : check if triggers are trivially valid */
err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
trig_mask = TRIG_FOLLOW;
if (devpriv->can_burst)
trig_mask |= TRIG_TIMER | TRIG_EXT;
err |= comedi_check_trigger_src(&cmd->scan_begin_src, trig_mask);
trig_mask = TRIG_TIMER | TRIG_EXT;
if (devpriv->can_burst)
trig_mask |= TRIG_NOW;
err |= comedi_check_trigger_src(&cmd->convert_src, trig_mask);
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->convert_src);
err |= comedi_check_trigger_is_unique(cmd->stop_src);
/* Step 2b : and mutually compatible */
/* make sure scan_begin_src and convert_src don't conflict */
if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
err |= -EINVAL;
if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
err |= -EINVAL;
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);
err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
cmd->chanlist_len);
/* check against maximum frequency */
if (cmd->scan_begin_src == TRIG_TIMER) {
err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
board->ai_speed *
cmd->chanlist_len);
}
if (cmd->convert_src == TRIG_TIMER) {
err |= comedi_check_trigger_arg_min(&cmd->convert_arg,
board->ai_speed);
}
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->scan_begin_src == TRIG_TIMER) {
arg = cmd->scan_begin_arg;
comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
}
if (cmd->convert_src == TRIG_TIMER) {
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 |= das16_ai_check_chanlist(dev, s, cmd);
if (err)
return 5;
return 0;
}
static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
unsigned int flags)
{
comedi_8254_cascade_ns_to_timer(dev->pacer, &ns, flags);
comedi_8254_update_divisors(dev->pacer);
comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
return ns;
}
static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct das16_private_struct *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
unsigned int first_chan = CR_CHAN(cmd->chanlist[0]);
unsigned int last_chan = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
unsigned int range = CR_RANGE(cmd->chanlist[0]);
unsigned int byte;
unsigned long flags;
if (cmd->flags & CMDF_PRIORITY) {
dev_err(dev->class_dev,
"isa dma transfers cannot be performed with CMDF_PRIORITY, aborting\n");
return -1;
}
if (devpriv->can_burst)
outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV_REG);
/* set mux and range for chanlist scan */
das16_ai_set_mux_range(dev, first_chan, last_chan, range);
/* set counter mode and counts */
cmd->convert_arg = das16_set_pacer(dev, cmd->convert_arg, cmd->flags);
/* enable counters */
byte = 0;
if (devpriv->can_burst) {
if (cmd->convert_src == TRIG_NOW) {
outb(DAS1600_BURST_VAL,
dev->iobase + DAS1600_BURST_REG);
/* set burst length */
byte |= DAS16_PACER_BURST_LEN(cmd->chanlist_len - 1);
} else {
outb(0, dev->iobase + DAS1600_BURST_REG);
}
}
outb(byte, dev->iobase + DAS16_PACER_REG);
/* set up dma transfer */
dma->cur_dma = 0;
das16_ai_setup_dma(dev, s, 0);
/* set up timer */
spin_lock_irqsave(&dev->spinlock, flags);
devpriv->timer_running = 1;
devpriv->timer.expires = jiffies + timer_period();
add_timer(&devpriv->timer);
/* enable DMA interrupt with external or internal pacing */
devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_PACING_MASK);
devpriv->ctrl_reg |= DAS16_CTRL_DMAE;
if (cmd->convert_src == TRIG_EXT)
devpriv->ctrl_reg |= DAS16_CTRL_EXT_PACER;
else
devpriv->ctrl_reg |= DAS16_CTRL_INT_PACER;
outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
if (devpriv->can_burst)
outb(0, dev->iobase + DAS1600_CONV_REG);
spin_unlock_irqrestore(&dev->spinlock, flags);
return 0;
}
static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct das16_private_struct *devpriv = dev->private;
struct comedi_isadma *dma = devpriv->dma;
unsigned long flags;
spin_lock_irqsave(&dev->spinlock, flags);
/* disable interrupts, dma and pacer clocked conversions */
devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_DMAE |
DAS16_CTRL_PACING_MASK);
outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
comedi_isadma_disable(dma->chan);
/* disable SW timer */
if (devpriv->timer_running) {
devpriv->timer_running = 0;
del_timer(&devpriv->timer);
}
if (devpriv->can_burst)
outb(0, dev->iobase + DAS1600_BURST_REG);
spin_unlock_irqrestore(&dev->spinlock, flags);
return 0;
}
static void das16_ai_munge(struct comedi_device *dev,
struct comedi_subdevice *s, void *array,
unsigned int num_bytes,
unsigned int start_chan_index)
{
unsigned short *data = array;
unsigned int num_samples = comedi_bytes_to_samples(s, num_bytes);
unsigned int i;
__le16 *buf = array;
for (i = 0; i < num_samples; i++) {
data[i] = le16_to_cpu(buf[i]);
if (s->maxdata == 0x0fff)
data[i] >>= 4;
data[i] &= s->maxdata;
}
}
static int das16_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
unsigned int status;
status = inb(dev->iobase + DAS16_STATUS_REG);
if ((status & DAS16_STATUS_BUSY) == 0)
return 0;
return -EBUSY;
}
static int das16_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);
unsigned int val;
int ret;
int i;
/* set mux and range for single channel */
das16_ai_set_mux_range(dev, chan, chan, range);
for (i = 0; i < insn->n; i++) {
/* trigger conversion */
outb_p(0, dev->iobase + DAS16_TRIG_REG);
ret = comedi_timeout(dev, s, insn, das16_ai_eoc, 0);
if (ret)
return ret;
val = inb(dev->iobase + DAS16_AI_MSB_REG) << 8;
val |= inb(dev->iobase + DAS16_AI_LSB_REG);
if (s->maxdata == 0x0fff)
val >>= 4;
val &= s->maxdata;
data[i] = val;
}
return insn->n;
}
static int das16_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);
int i;
for (i = 0; i < insn->n; i++) {
unsigned int val = data[i];
s->readback[chan] = val;
val <<= 4;
outb(val & 0xff, dev->iobase + DAS16_AO_LSB_REG(chan));
outb((val >> 8) & 0xff, dev->iobase + DAS16_AO_MSB_REG(chan));
}
return insn->n;
}
static int das16_di_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
data[1] = inb(dev->iobase + DAS16_DIO_REG) & 0xf;
return insn->n;
}
static int das16_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 + DAS16_DIO_REG);
data[1] = s->state;
return insn->n;
}
static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct das16_board *board = dev->board_ptr;
int diobits;
/* diobits indicates boards */
diobits = inb(dev->iobase + DAS16_DIO_REG) & 0xf0;
if (board->id != diobits) {
dev_err(dev->class_dev,
"requested board's id bits are incorrect (0x%x != 0x%x)\n",
board->id, diobits);
return -EINVAL;
}
return 0;
}
static void das16_reset(struct comedi_device *dev)
{
outb(0, dev->iobase + DAS16_STATUS_REG);
outb(0, dev->iobase + DAS16_CTRL_REG);
outb(0, dev->iobase + DAS16_PACER_REG);
}
static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
{
struct das16_private_struct *devpriv = dev->private;
timer_setup(&devpriv->timer, das16_timer_interrupt, 0);
/* only DMA channels 3 and 1 are valid */
if (!(dma_chan == 1 || dma_chan == 3))
return;
/* DMA uses two buffers */
devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
DAS16_DMA_SIZE, COMEDI_ISADMA_READ);
}
static void das16_free_dma(struct comedi_device *dev)
{
struct das16_private_struct *devpriv = dev->private;
if (devpriv) {
del_timer_sync(&devpriv->timer);
comedi_isadma_free(devpriv->dma);
}
}
static const struct comedi_lrange *das16_ai_range(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_devconfig *it,
unsigned int pg_type,
unsigned int status)
{
unsigned int min = it->options[4];
unsigned int max = it->options[5];
/* get any user-defined input range */
if (pg_type == das16_pg_none && (min || max)) {
struct comedi_lrange *lrange;
struct comedi_krange *krange;
/* allocate single-range range table */
lrange = comedi_alloc_spriv(s,
struct_size(lrange, range, 1));
if (!lrange)
return &range_unknown;
/* initialize ai range */
lrange->length = 1;
krange = lrange->range;
krange->min = min;
krange->max = max;
krange->flags = UNIT_volt;
return lrange;
}
/* use software programmable range */
if (status & DAS16_STATUS_UNIPOLAR)
return das16_ai_uni_lranges[pg_type];
return das16_ai_bip_lranges[pg_type];
}
static const struct comedi_lrange *das16_ao_range(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_devconfig *it)
{
unsigned int min = it->options[6];
unsigned int max = it->options[7];
/* get any user-defined output range */
if (min || max) {
struct comedi_lrange *lrange;
struct comedi_krange *krange;
/* allocate single-range range table */
lrange = comedi_alloc_spriv(s,
struct_size(lrange, range, 1));
if (!lrange)
return &range_unknown;
/* initialize ao range */
lrange->length = 1;
krange = lrange->range;
krange->min = min;
krange->max = max;
krange->flags = UNIT_volt;
return lrange;
}
return &range_unknown;
}
static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct das16_board *board = dev->board_ptr;
struct das16_private_struct *devpriv;
struct comedi_subdevice *s;
unsigned int osc_base;
unsigned int status;
int ret;
/* check that clock setting is valid */
if (it->options[3]) {
if (it->options[3] != 1 && it->options[3] != 10) {
dev_err(dev->class_dev,
"Invalid option. Master clock must be set to 1 or 10 (MHz)\n");
return -EINVAL;
}
}
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
devpriv->dev = dev;
if (board->size < 0x400) {
ret = comedi_request_region(dev, it->options[0], board->size);
if (ret)
return ret;
} else {
ret = comedi_request_region(dev, it->options[0], 0x10);
if (ret)
return ret;
/* Request an additional region for the 8255 */
ret = __comedi_request_region(dev, dev->iobase + 0x400,
board->size & 0x3ff);
if (ret)
return ret;
devpriv->extra_iobase = dev->iobase + 0x400;
devpriv->can_burst = 1;
}
/* probe id bits to make sure they are consistent */
if (das16_probe(dev, it))
return -EINVAL;
/* get master clock speed */
osc_base = I8254_OSC_BASE_1MHZ;
if (devpriv->can_burst) {
status = inb(dev->iobase + DAS1600_STATUS_REG);
if (status & DAS1600_STATUS_CLK_10MHZ)
osc_base = I8254_OSC_BASE_10MHZ;
} else {
if (it->options[3])
osc_base = I8254_OSC_BASE_1MHZ / it->options[3];
}
dev->pacer = comedi_8254_io_alloc(dev->iobase + DAS16_TIMER_BASE_REG,
osc_base, I8254_IO8, 0);
if (IS_ERR(dev->pacer))
return PTR_ERR(dev->pacer);
das16_alloc_dma(dev, it->options[2]);
ret = comedi_alloc_subdevices(dev, 4 + board->has_8255);
if (ret)
return ret;
status = inb(dev->iobase + DAS16_STATUS_REG);
/* Analog Input subdevice */
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE;
if (status & DAS16_STATUS_MUXBIT) {
s->subdev_flags |= SDF_GROUND;
s->n_chan = 16;
} else {
s->subdev_flags |= SDF_DIFF;
s->n_chan = 8;
}
s->len_chanlist = s->n_chan;
s->maxdata = board->ai_maxdata;
s->range_table = das16_ai_range(dev, s, it, board->ai_pg, status);
s->insn_read = das16_ai_insn_read;
if (devpriv->dma) {
dev->read_subdev = s;
s->subdev_flags |= SDF_CMD_READ;
s->do_cmdtest = das16_cmd_test;
s->do_cmd = das16_cmd_exec;
s->cancel = das16_cancel;
s->munge = das16_ai_munge;
}
/* Analog Output subdevice */
s = &dev->subdevices[1];
if (board->has_ao) {
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = 2;
s->maxdata = 0x0fff;
s->range_table = das16_ao_range(dev, s, it);
s->insn_write = das16_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 = 4;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = das16_di_insn_bits;
/* Digital Output subdevice */
s = &dev->subdevices[3];
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 = das16_do_insn_bits;
/* initialize digital output lines */
outb(s->state, dev->iobase + DAS16_DIO_REG);
/* 8255 Digital I/O subdevice */
if (board->has_8255) {
s = &dev->subdevices[4];
ret = subdev_8255_io_init(dev, s, board->i8255_offset);
if (ret)
return ret;
}
das16_reset(dev);
/* set the interrupt level */
devpriv->ctrl_reg = DAS16_CTRL_IRQ(dev->irq);
outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
if (devpriv->can_burst) {
outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE_REG);
outb(0, dev->iobase + DAS1600_CONV_REG);
outb(0, dev->iobase + DAS1600_BURST_REG);
}
return 0;
}
static void das16_detach(struct comedi_device *dev)
{
const struct das16_board *board = dev->board_ptr;
struct das16_private_struct *devpriv = dev->private;
if (devpriv) {
if (dev->iobase)
das16_reset(dev);
das16_free_dma(dev);
if (devpriv->extra_iobase)
release_region(devpriv->extra_iobase,
board->size & 0x3ff);
}
comedi_legacy_detach(dev);
}
static struct comedi_driver das16_driver = {
.driver_name = "das16",
.module = THIS_MODULE,
.attach = das16_attach,
.detach = das16_detach,
.board_name = &das16_boards[0].name,
.num_names = ARRAY_SIZE(das16_boards),
.offset = sizeof(das16_boards[0]),
};
module_comedi_driver(das16_driver);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for DAS16 compatible boards");
MODULE_LICENSE("GPL");
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