freebsd-skq/sys/dev/ieee488/upd7210.c
2012-01-15 13:23:43 +00:00

370 lines
8.8 KiB
C

/*-
* Copyright (c) 2005 Poul-Henning Kamp <phk@FreeBSD.org>
* Copyright (c) 2010 Joerg Wunsch <joerg@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* High-level driver for µPD7210 based GPIB cards.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
# define GPIB_DEBUG
# undef GPIB_DEBUG
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <isa/isavar.h>
#define UPD7210_HW_DRIVER
#define UPD7210_SW_DRIVER
#include <dev/ieee488/upd7210.h>
#include <dev/ieee488/tnt4882.h>
static MALLOC_DEFINE(M_GPIB, "GPIB", "GPIB");
/* upd7210 generic stuff */
void
upd7210_print_isr(u_int isr1, u_int isr2)
{
printf("isr1=0x%b isr2=0x%b",
isr1, "\20\10CPT\7APT\6DET\5ENDRX\4DEC\3ERR\2DO\1DI",
isr2, "\20\10INT\7SRQI\6LOK\5REM\4CO\3LOKC\2REMC\1ADSC");
}
u_int
upd7210_rd(struct upd7210 *u, enum upd7210_rreg reg)
{
u_int r;
r = bus_read_1(u->reg_res[reg], u->reg_offset[reg]);
u->rreg[reg] = r;
return (r);
}
void
upd7210_wr(struct upd7210 *u, enum upd7210_wreg reg, u_int val)
{
bus_write_1(u->reg_res[reg], u->reg_offset[reg], val);
u->wreg[reg] = val;
if (reg == AUXMR)
u->wreg[8 + (val >> 5)] = val & 0x1f;
}
void
upd7210intr(void *arg)
{
u_int isr_1, isr_2, isr_3;
struct upd7210 *u;
u = arg;
mtx_lock(&u->mutex);
isr_1 = upd7210_rd(u, ISR1);
isr_2 = upd7210_rd(u, ISR2);
if (u->use_fifo) {
isr_3 = bus_read_1(u->reg_res[0], isr3);
} else {
isr_3 = 0;
}
if (isr_1 != 0 || isr_2 != 0 || isr_3 != 0) {
if (u->busy == 0 || u->irq == NULL || !u->irq(u, isr_3)) {
#if 0
printf("upd7210intr [%02x %02x %02x",
upd7210_rd(u, DIR), isr1, isr2);
printf(" %02x %02x %02x %02x %02x] ",
upd7210_rd(u, SPSR),
upd7210_rd(u, ADSR),
upd7210_rd(u, CPTR),
upd7210_rd(u, ADR0),
upd7210_rd(u, ADR1));
upd7210_print_isr(isr1, isr2);
printf("\n");
#endif
}
/*
* "special interrupt handling"
*
* In order to implement shared IRQs, the original
* PCIIa uses IO locations 0x2f0 + (IRQ#) as an output
* location. If an ISR for a particular card has
* detected this card triggered the IRQ, it must reset
* the card's IRQ by writing (anything) to that IO
* location.
*
* Some clones apparently don't implement this
* feature, but National Instrument cards do.
*/
if (u->irq_clear_res != NULL)
bus_write_1(u->irq_clear_res, 0, 42);
}
mtx_unlock(&u->mutex);
}
int
upd7210_take_ctrl_async(struct upd7210 *u)
{
int i;
upd7210_wr(u, AUXMR, AUXMR_TCA);
if (!(upd7210_rd(u, ADSR) & ADSR_ATN))
return (0);
for (i = 0; i < 20; i++) {
DELAY(1);
if (!(upd7210_rd(u, ADSR) & ADSR_ATN))
return (0);
}
return (1);
}
int
upd7210_goto_standby(struct upd7210 *u)
{
int i;
upd7210_wr(u, AUXMR, AUXMR_GTS);
if (upd7210_rd(u, ADSR) & ADSR_ATN)
return (0);
for (i = 0; i < 20; i++) {
DELAY(1);
if (upd7210_rd(u, ADSR) & ADSR_ATN)
return (0);
}
return (1);
}
/* Unaddressed Listen Only mode */
static int
gpib_l_irq(struct upd7210 *u, int isr_3)
{
int i;
int have_data = 0;
if (u->use_fifo) {
/* TNT5004 or TNT4882 in FIFO mode */
if (isr_3 & 0x04) {
/* FIFO not empty */
i = bus_read_1(u->reg_res[0], fifob);
have_data = 1;
bus_write_1(u->reg_res[0], cnt0, -1);
bus_write_1(u->reg_res[0], cnt1, (-1) >> 8);
bus_write_1(u->reg_res[0], cnt2, (-1) >> 16);
bus_write_1(u->reg_res[0], cnt3, (-1) >> 24);
bus_write_1(u->reg_res[0], cmdr, 0x04); /* GO */
}
} else if (u->rreg[ISR1] & 1) {
i = upd7210_rd(u, DIR);
have_data = 1;
}
if (have_data) {
u->buf[u->buf_wp++] = i;
u->buf_wp &= (u->bufsize - 1);
i = (u->buf_rp + u->bufsize - u->buf_wp) & (u->bufsize - 1);
if (i < 8) {
if (u->use_fifo)
bus_write_1(u->reg_res[0], imr3, 0x00);
else
upd7210_wr(u, IMR1, 0);
}
wakeup(u->buf);
return (1);
}
return (0);
}
static int
gpib_l_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct upd7210 *u;
u = dev->si_drv1;
mtx_lock(&u->mutex);
if (u->busy) {
mtx_unlock(&u->mutex);
return (EBUSY);
}
u->busy = 1;
u->irq = gpib_l_irq;
mtx_unlock(&u->mutex);
u->buf = malloc(PAGE_SIZE, M_GPIB, M_WAITOK);
u->bufsize = PAGE_SIZE;
u->buf_wp = 0;
u->buf_rp = 0;
upd7210_wr(u, AUXMR, AUXMR_CRST); /* chip reset */
DELAY(10000);
upd7210_wr(u, AUXMR, C_ICR | 8); /* 8 MHz clock */
DELAY(1000);
upd7210_wr(u, ADR, 0x60); /* ADR0: disable listener and talker 0 */
upd7210_wr(u, ADR, 0xe0); /* ADR1: disable listener and talker 1 */
upd7210_wr(u, ADMR, 0x70); /* listen-only (lon) */
upd7210_wr(u, AUXMR, AUXMR_PON); /* immediate execute power-on (pon) */
if (u->use_fifo) {
/* TNT5004 or TNT4882 in FIFO mode */
bus_write_1(u->reg_res[0], cmdr, 0x10); /* reset FIFO */
bus_write_1(u->reg_res[0], cfg, 0x20); /* xfer IN, 8-bit FIFO */
bus_write_1(u->reg_res[0], cnt0, -1);
bus_write_1(u->reg_res[0], cnt1, (-1) >> 8);
bus_write_1(u->reg_res[0], cnt2, (-1) >> 16);
bus_write_1(u->reg_res[0], cnt3, (-1) >> 24);
bus_write_1(u->reg_res[0], cmdr, 0x04); /* GO */
bus_write_1(u->reg_res[0], imr3, 0x04); /* NEF IE */
} else {
/* µPD7210/NAT7210, or TNT4882 in non-FIFO mode */
upd7210_wr(u, IMR1, 0x01); /* data in interrupt enable */
}
return (0);
}
static int
gpib_l_close(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct upd7210 *u;
u = dev->si_drv1;
mtx_lock(&u->mutex);
u->busy = 0;
if (u->use_fifo) {
/* TNT5004 or TNT4882 in FIFO mode */
bus_write_1(u->reg_res[0], cmdr, 0x22); /* soft RESET */
bus_write_1(u->reg_res[0], imr3, 0x00);
}
upd7210_wr(u, AUXMR, AUXMR_CRST);
DELAY(10000);
upd7210_wr(u, IMR1, 0x00);
upd7210_wr(u, IMR2, 0x00);
free(u->buf, M_GPIB);
u->buf = NULL;
mtx_unlock(&u->mutex);
return (0);
}
static int
gpib_l_read(struct cdev *dev, struct uio *uio, int ioflag)
{
struct upd7210 *u;
int error;
size_t z;
u = dev->si_drv1;
error = 0;
mtx_lock(&u->mutex);
while (u->buf_wp == u->buf_rp) {
error = msleep(u->buf, &u->mutex, PZERO | PCATCH,
"gpibrd", hz);
if (error && error != EWOULDBLOCK) {
mtx_unlock(&u->mutex);
return (error);
}
}
while (uio->uio_resid > 0 && u->buf_wp != u->buf_rp) {
if (u->buf_wp < u->buf_rp)
z = u->bufsize - u->buf_rp;
else
z = u->buf_wp - u->buf_rp;
if (z > uio->uio_resid)
z = uio->uio_resid;
mtx_unlock(&u->mutex);
error = uiomove(u->buf + u->buf_rp, z, uio);
mtx_lock(&u->mutex);
if (error)
break;
u->buf_rp += z;
u->buf_rp &= (u->bufsize - 1);
}
if (u->use_fifo) {
bus_write_1(u->reg_res[0], imr3, 0x04); /* NFF IE */
} else {
if (u->wreg[IMR1] == 0)
upd7210_wr(u, IMR1, 0x01);
}
mtx_unlock(&u->mutex);
return (error);
}
static struct cdevsw gpib_l_cdevsw = {
.d_version = D_VERSION,
.d_name = "gpib_l",
.d_open = gpib_l_open,
.d_close = gpib_l_close,
.d_read = gpib_l_read,
};
/* Housekeeping */
static struct unrhdr *units;
void
upd7210attach(struct upd7210 *u)
{
struct cdev *dev;
if (units == NULL)
units = new_unrhdr(0, INT_MAX, NULL);
u->unit = alloc_unr(units);
mtx_init(&u->mutex, "gpib", NULL, MTX_DEF);
u->cdev = make_dev(&gpib_l_cdevsw, u->unit,
UID_ROOT, GID_WHEEL, 0444,
"gpib%ul", u->unit);
u->cdev->si_drv1 = u;
dev = make_dev(&gpib_ib_cdevsw, u->unit,
UID_ROOT, GID_WHEEL, 0444,
"gpib%uib", u->unit);
dev->si_drv1 = u;
dev_depends(u->cdev, dev);
}
void
upd7210detach(struct upd7210 *u)
{
destroy_dev(u->cdev);
mtx_destroy(&u->mutex);
free_unr(units, u->unit);
}