// SPDX-License-Identifier: GPL-2.0+
/*
* pcmuio.c
* Comedi driver for Winsystems PC-104 based 48/96-channel DIO boards.
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 2006 Calin A. Culianu <[email protected]>
*/
/*
* Driver: pcmuio
* Description: Winsystems PC-104 based 48/96-channel DIO boards.
* Devices: [Winsystems] PCM-UIO48A (pcmuio48), PCM-UIO96A (pcmuio96)
* Author: Calin Culianu <[email protected]>
* Updated: Fri, 13 Jan 2006 12:01:01 -0500
* Status: works
*
* A driver for the relatively straightforward-to-program PCM-UIO48A and
* PCM-UIO96A boards from Winsystems. These boards use either one or two
* (in the 96-DIO version) WS16C48 ASIC HighDensity I/O Chips (HDIO). This
* chip is interesting in that each I/O line is individually programmable
* for INPUT or OUTPUT (thus comedi_dio_config can be done on a per-channel
* basis). Also, each chip supports edge-triggered interrupts for the first
* 24 I/O lines. Of course, since the 96-channel version of the board has
* two ASICs, it can detect polarity changes on up to 48 I/O lines. Since
* this is essentially an (non-PnP) ISA board, I/O Address and IRQ selection
* are done through jumpers on the board. You need to pass that information
* to this driver as the first and second comedi_config option, respectively.
* Note that the 48-channel version uses 16 bytes of IO memory and the 96-
* channel version uses 32-bytes (in case you are worried about conflicts).
* The 48-channel board is split into two 24-channel comedi subdevices. The
* 96-channel board is split into 4 24-channel DIO subdevices.
*
* Note that IRQ support has been added, but it is untested.
*
* To use edge-detection IRQ support, pass the IRQs of both ASICS (for the
* 96 channel version) or just 1 ASIC (for 48-channel version). Then, use
* comedi_commands with TRIG_NOW. Your callback will be called each time an
* edge is triggered, and the data values will be two sample_t's, which
* should be concatenated to form one 32-bit unsigned int. This value is
* the mask of channels that had edges detected from your channel list. Note
* that the bits positions in the mask correspond to positions in your
* chanlist when you specified the command and *not* channel id's!
*
* To set the polarity of the edge-detection interrupts pass a nonzero value
* for either CR_RANGE or CR_AREF for edge-up polarity, or a zero value for
* both CR_RANGE and CR_AREF if you want edge-down polarity.
*
* In the 48-channel version:
*
* On subdev 0, the first 24 channels are edge-detect channels.
*
* In the 96-channel board you have the following channels that can do edge
* detection:
*
* subdev 0, channels 0-24 (first 24 channels of 1st ASIC)
* subdev 2, channels 0-24 (first 24 channels of 2nd ASIC)
*
* Configuration Options:
* [0] - I/O port base address
* [1] - IRQ (for first ASIC, or first 24 channels)
* [2] - IRQ (for second ASIC, pcmuio96 only - IRQ for chans 48-72
* can be the same as first irq!)
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/comedi/comedidev.h>
/*
* Register I/O map
*
* Offset Page 0 Page 1 Page 2 Page 3
* ------ ----------- ----------- ----------- -----------
* 0x00 Port 0 I/O Port 0 I/O Port 0 I/O Port 0 I/O
* 0x01 Port 1 I/O Port 1 I/O Port 1 I/O Port 1 I/O
* 0x02 Port 2 I/O Port 2 I/O Port 2 I/O Port 2 I/O
* 0x03 Port 3 I/O Port 3 I/O Port 3 I/O Port 3 I/O
* 0x04 Port 4 I/O Port 4 I/O Port 4 I/O Port 4 I/O
* 0x05 Port 5 I/O Port 5 I/O Port 5 I/O Port 5 I/O
* 0x06 INT_PENDING INT_PENDING INT_PENDING INT_PENDING
* 0x07 Page/Lock Page/Lock Page/Lock Page/Lock
* 0x08 N/A POL_0 ENAB_0 INT_ID0
* 0x09 N/A POL_1 ENAB_1 INT_ID1
* 0x0a N/A POL_2 ENAB_2 INT_ID2
*/
#define PCMUIO_PORT_REG(x) (0x00 + (x))
#define PCMUIO_INT_PENDING_REG 0x06
#define PCMUIO_PAGE_LOCK_REG 0x07
#define PCMUIO_LOCK_PORT(x) ((1 << (x)) & 0x3f)
#define PCMUIO_PAGE(x) (((x) & 0x3) << 6)
#define PCMUIO_PAGE_MASK PCMUIO_PAGE(3)
#define PCMUIO_PAGE_POL 1
#define PCMUIO_PAGE_ENAB 2
#define PCMUIO_PAGE_INT_ID 3
#define PCMUIO_PAGE_REG(x) (0x08 + (x))
#define PCMUIO_ASIC_IOSIZE 0x10
#define PCMUIO_MAX_ASICS 2
struct pcmuio_board {
const char *name;
const int num_asics;
};
static const struct pcmuio_board pcmuio_boards[] = {
{
.name = "pcmuio48",
.num_asics = 1,
}, {
.name = "pcmuio96",
.num_asics = 2,
},
};
struct pcmuio_asic {
spinlock_t pagelock; /* protects the page registers */
spinlock_t spinlock; /* protects member variables */
unsigned int enabled_mask;
unsigned int active:1;
};
struct pcmuio_private {
struct pcmuio_asic asics[PCMUIO_MAX_ASICS];
unsigned int irq2;
};
static inline unsigned long pcmuio_asic_iobase(struct comedi_device *dev,
int asic)
{
return dev->iobase + (asic * PCMUIO_ASIC_IOSIZE);
}
static inline int pcmuio_subdevice_to_asic(struct comedi_subdevice *s)
{
/*
* subdevice 0 and 1 are handled by the first asic
* subdevice 2 and 3 are handled by the second asic
*/
return s->index / 2;
}
static inline int pcmuio_subdevice_to_port(struct comedi_subdevice *s)
{
/*
* subdevice 0 and 2 use port registers 0-2
* subdevice 1 and 3 use port registers 3-5
*/
return (s->index % 2) ? 3 : 0;
}
static void pcmuio_write(struct comedi_device *dev, unsigned int val,
int asic, int page, int port)
{
struct pcmuio_private *devpriv = dev->private;
struct pcmuio_asic *chip = &devpriv->asics[asic];
unsigned long iobase = pcmuio_asic_iobase(dev, asic);
unsigned long flags;
spin_lock_irqsave(&chip->pagelock, flags);
if (page == 0) {
/* Port registers are valid for any page */
outb(val & 0xff, iobase + PCMUIO_PORT_REG(port + 0));
outb((val >> 8) & 0xff, iobase + PCMUIO_PORT_REG(port + 1));
outb((val >> 16) & 0xff, iobase + PCMUIO_PORT_REG(port + 2));
} else {
outb(PCMUIO_PAGE(page), iobase + PCMUIO_PAGE_LOCK_REG);
outb(val & 0xff, iobase + PCMUIO_PAGE_REG(0));
outb((val >> 8) & 0xff, iobase + PCMUIO_PAGE_REG(1));
outb((val >> 16) & 0xff, iobase + PCMUIO_PAGE_REG(2));
}
spin_unlock_irqrestore(&chip->pagelock, flags);
}
static unsigned int pcmuio_read(struct comedi_device *dev,
int asic, int page, int port)
{
struct pcmuio_private *devpriv = dev->private;
struct pcmuio_asic *chip = &devpriv->asics[asic];
unsigned long iobase = pcmuio_asic_iobase(dev, asic);
unsigned long flags;
unsigned int val;
spin_lock_irqsave(&chip->pagelock, flags);
if (page == 0) {
/* Port registers are valid for any page */
val = inb(iobase + PCMUIO_PORT_REG(port + 0));
val |= (inb(iobase + PCMUIO_PORT_REG(port + 1)) << 8);
val |= (inb(iobase + PCMUIO_PORT_REG(port + 2)) << 16);
} else {
outb(PCMUIO_PAGE(page), iobase + PCMUIO_PAGE_LOCK_REG);
val = inb(iobase + PCMUIO_PAGE_REG(0));
val |= (inb(iobase + PCMUIO_PAGE_REG(1)) << 8);
val |= (inb(iobase + PCMUIO_PAGE_REG(2)) << 16);
}
spin_unlock_irqrestore(&chip->pagelock, flags);
return val;
}
/*
* Each channel can be individually programmed for input or output.
* Writing a '0' to a channel causes the corresponding output pin
* to go to a high-z state (pulled high by an external 10K resistor).
* This allows it to be used as an input. When used in the input mode,
* a read reflects the inverted state of the I/O pin, such that a
* high on the pin will read as a '0' in the register. Writing a '1'
* to a bit position causes the pin to sink current (up to 12mA),
* effectively pulling it low.
*/
static int pcmuio_dio_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
int asic = pcmuio_subdevice_to_asic(s);
int port = pcmuio_subdevice_to_port(s);
unsigned int chanmask = (1 << s->n_chan) - 1;
unsigned int mask;
unsigned int val;
mask = comedi_dio_update_state(s, data);
if (mask) {
/*
* Outputs are inverted, invert the state and
* update the channels.
*
* The s->io_bits mask makes sure the input channels
* are '0' so that the outputs pins stay in a high
* z-state.
*/
val = ~s->state & chanmask;
val &= s->io_bits;
pcmuio_write(dev, val, asic, 0, port);
}
/* get inverted state of the channels from the port */
val = pcmuio_read(dev, asic, 0, port);
/* return the true state of the channels */
data[1] = ~val & chanmask;
return insn->n;
}
static int pcmuio_dio_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
int asic = pcmuio_subdevice_to_asic(s);
int port = pcmuio_subdevice_to_port(s);
int ret;
ret = comedi_dio_insn_config(dev, s, insn, data, 0);
if (ret)
return ret;
if (data[0] == INSN_CONFIG_DIO_INPUT)
pcmuio_write(dev, s->io_bits, asic, 0, port);
return insn->n;
}
static void pcmuio_reset(struct comedi_device *dev)
{
const struct pcmuio_board *board = dev->board_ptr;
int asic;
for (asic = 0; asic < board->num_asics; ++asic) {
/* first, clear all the DIO port bits */
pcmuio_write(dev, 0, asic, 0, 0);
pcmuio_write(dev, 0, asic, 0, 3);
/* Next, clear all the paged registers for each page */
pcmuio_write(dev, 0, asic, PCMUIO_PAGE_POL, 0);
pcmuio_write(dev, 0, asic, PCMUIO_PAGE_ENAB, 0);
pcmuio_write(dev, 0, asic, PCMUIO_PAGE_INT_ID, 0);
}
}
/* chip->spinlock is already locked */
static void pcmuio_stop_intr(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct pcmuio_private *devpriv = dev->private;
int asic = pcmuio_subdevice_to_asic(s);
struct pcmuio_asic *chip = &devpriv->asics[asic];
chip->enabled_mask = 0;
chip->active = 0;
s->async->inttrig = NULL;
/* disable all intrs for this subdev.. */
pcmuio_write(dev, 0, asic, PCMUIO_PAGE_ENAB, 0);
}
static void pcmuio_handle_intr_subdev(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int triggered)
{
struct pcmuio_private *devpriv = dev->private;
int asic = pcmuio_subdevice_to_asic(s);
struct pcmuio_asic *chip = &devpriv->asics[asic];
struct comedi_cmd *cmd = &s->async->cmd;
unsigned int val = 0;
unsigned long flags;
unsigned int i;
spin_lock_irqsave(&chip->spinlock, flags);
if (!chip->active)
goto done;
if (!(triggered & chip->enabled_mask))
goto done;
for (i = 0; i < cmd->chanlist_len; i++) {
unsigned int chan = CR_CHAN(cmd->chanlist[i]);
if (triggered & (1 << chan))
val |= (1 << i);
}
comedi_buf_write_samples(s, &val, 1);
if (cmd->stop_src == TRIG_COUNT &&
s->async->scans_done >= cmd->stop_arg)
s->async->events |= COMEDI_CB_EOA;
done:
spin_unlock_irqrestore(&chip->spinlock, flags);
comedi_handle_events(dev, s);
}
static int pcmuio_handle_asic_interrupt(struct comedi_device *dev, int asic)
{
/* there are could be two asics so we can't use dev->read_subdev */
struct comedi_subdevice *s = &dev->subdevices[asic * 2];
unsigned long iobase = pcmuio_asic_iobase(dev, asic);
unsigned int val;
/* are there any interrupts pending */
val = inb(iobase + PCMUIO_INT_PENDING_REG) & 0x07;
if (!val)
return 0;
/* get, and clear, the pending interrupts */
val = pcmuio_read(dev, asic, PCMUIO_PAGE_INT_ID, 0);
pcmuio_write(dev, 0, asic, PCMUIO_PAGE_INT_ID, 0);
/* handle the pending interrupts */
pcmuio_handle_intr_subdev(dev, s, val);
return 1;
}
static irqreturn_t pcmuio_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct pcmuio_private *devpriv = dev->private;
int handled = 0;
if (irq == dev->irq)
handled += pcmuio_handle_asic_interrupt(dev, 0);
if (irq == devpriv->irq2)
handled += pcmuio_handle_asic_interrupt(dev, 1);
return handled ? IRQ_HANDLED : IRQ_NONE;
}
/* chip->spinlock is already locked */
static void pcmuio_start_intr(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct pcmuio_private *devpriv = dev->private;
int asic = pcmuio_subdevice_to_asic(s);
struct pcmuio_asic *chip = &devpriv->asics[asic];
struct comedi_cmd *cmd = &s->async->cmd;
unsigned int bits = 0;
unsigned int pol_bits = 0;
int i;
chip->enabled_mask = 0;
chip->active = 1;
if (cmd->chanlist) {
for (i = 0; i < cmd->chanlist_len; i++) {
unsigned int chanspec = cmd->chanlist[i];
unsigned int chan = CR_CHAN(chanspec);
unsigned int range = CR_RANGE(chanspec);
unsigned int aref = CR_AREF(chanspec);
bits |= (1 << chan);
pol_bits |= ((aref || range) ? 1 : 0) << chan;
}
}
bits &= ((1 << s->n_chan) - 1);
chip->enabled_mask = bits;
/* set pol and enab intrs for this subdev.. */
pcmuio_write(dev, pol_bits, asic, PCMUIO_PAGE_POL, 0);
pcmuio_write(dev, bits, asic, PCMUIO_PAGE_ENAB, 0);
}
static int pcmuio_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct pcmuio_private *devpriv = dev->private;
int asic = pcmuio_subdevice_to_asic(s);
struct pcmuio_asic *chip = &devpriv->asics[asic];
unsigned long flags;
spin_lock_irqsave(&chip->spinlock, flags);
if (chip->active)
pcmuio_stop_intr(dev, s);
spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
static int pcmuio_inttrig_start_intr(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int trig_num)
{
struct pcmuio_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
int asic = pcmuio_subdevice_to_asic(s);
struct pcmuio_asic *chip = &devpriv->asics[asic];
unsigned long flags;
if (trig_num != cmd->start_arg)
return -EINVAL;
spin_lock_irqsave(&chip->spinlock, flags);
s->async->inttrig = NULL;
if (chip->active)
pcmuio_start_intr(dev, s);
spin_unlock_irqrestore(&chip->spinlock, flags);
return 1;
}
/*
* 'do_cmd' function for an 'INTERRUPT' subdevice.
*/
static int pcmuio_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct pcmuio_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
int asic = pcmuio_subdevice_to_asic(s);
struct pcmuio_asic *chip = &devpriv->asics[asic];
unsigned long flags;
spin_lock_irqsave(&chip->spinlock, flags);
chip->active = 1;
/* Set up start of acquisition. */
if (cmd->start_src == TRIG_INT)
s->async->inttrig = pcmuio_inttrig_start_intr;
else /* TRIG_NOW */
pcmuio_start_intr(dev, s);
spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
static int pcmuio_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_INT);
err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
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->start_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_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 (err) return 4; */
return 0;
}
static int pcmuio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct pcmuio_board *board = dev->board_ptr;
struct comedi_subdevice *s;
struct pcmuio_private *devpriv;
int ret;
int i;
ret = comedi_request_region(dev, it->options[0],
board->num_asics * PCMUIO_ASIC_IOSIZE);
if (ret)
return ret;
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
for (i = 0; i < PCMUIO_MAX_ASICS; ++i) {
struct pcmuio_asic *chip = &devpriv->asics[i];
spin_lock_init(&chip->pagelock);
spin_lock_init(&chip->spinlock);
}
pcmuio_reset(dev);
if (it->options[1]) {
/* request the irq for the 1st asic */
ret = request_irq(it->options[1], pcmuio_interrupt, 0,
dev->board_name, dev);
if (ret == 0)
dev->irq = it->options[1];
}
if (board->num_asics == 2) {
if (it->options[2] == dev->irq) {
/* the same irq (or none) is used by both asics */
devpriv->irq2 = it->options[2];
} else if (it->options[2]) {
/* request the irq for the 2nd asic */
ret = request_irq(it->options[2], pcmuio_interrupt, 0,
dev->board_name, dev);
if (ret == 0)
devpriv->irq2 = it->options[2];
}
}
ret = comedi_alloc_subdevices(dev, board->num_asics * 2);
if (ret)
return ret;
for (i = 0; i < dev->n_subdevices; ++i) {
s = &dev->subdevices[i];
s->type = COMEDI_SUBD_DIO;
s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
s->n_chan = 24;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = pcmuio_dio_insn_bits;
s->insn_config = pcmuio_dio_insn_config;
/* subdevices 0 and 2 can support interrupts */
if ((i == 0 && dev->irq) || (i == 2 && devpriv->irq2)) {
/* setup the interrupt subdevice */
dev->read_subdev = s;
s->subdev_flags |= SDF_CMD_READ | SDF_LSAMPL |
SDF_PACKED;
s->len_chanlist = s->n_chan;
s->cancel = pcmuio_cancel;
s->do_cmd = pcmuio_cmd;
s->do_cmdtest = pcmuio_cmdtest;
}
}
return 0;
}
static void pcmuio_detach(struct comedi_device *dev)
{
struct pcmuio_private *devpriv = dev->private;
if (devpriv) {
pcmuio_reset(dev);
/* free the 2nd irq if used, the core will free the 1st one */
if (devpriv->irq2 && devpriv->irq2 != dev->irq)
free_irq(devpriv->irq2, dev);
}
comedi_legacy_detach(dev);
}
static struct comedi_driver pcmuio_driver = {
.driver_name = "pcmuio",
.module = THIS_MODULE,
.attach = pcmuio_attach,
.detach = pcmuio_detach,
.board_name = &pcmuio_boards[0].name,
.offset = sizeof(struct pcmuio_board),
.num_names = ARRAY_SIZE(pcmuio_boards),
};
module_comedi_driver(pcmuio_driver);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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