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e5732e1803
freebsd/sys/dev/ieee488/upd7210.c
Ed Schouten 06d425f92e Remove the distinction between device minor and unit numbers. 
Even though we got rid of device major numbers some time ago, device
drivers still need to provide unique device minor numbers to make_dev().
These numbers are only used inside the kernel. They are not related to
device major and minor numbers which are visible in devfs. These are
actually based on the inode number of the device.

It would eventually be nice to remove minor numbers entirely, but we
don't want to be too agressive here.

Because the 8-15 bits of the device number field (si_drv0) are still
reserved for the major number, there is no 1:1 mapping of the device
minor and unit numbers. Because this is now unused, remove the
restrictions on these numbers.

The MAXMAJOR definition was actually used for two purposes. It was used
to convert both the userspace and kernelspace device numbers to their
major/minor pair, which is why it is now named UMINORMASK.

minor2unit() and unit2minor() have now become useless. Both minor() and
dev2unit() now serve the same purpose. We should eventually remove some
of them, at least turning them into macro's. If devfs would become
completely minor number unaware, we could consider using si_drv0 directly,
just like si_drv1 and si_drv2.

Approved by:	philip (mentor)
2008-05-29 12:50:46 +00:00

303 lines
6.6 KiB
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/*-
* Copyright (c) 2005 Poul-Henning Kamp <phk@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>
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 isr1, isr2;
struct upd7210 *u;
u = arg;
mtx_lock(&u->mutex);
isr1 = upd7210_rd(u, ISR1);
isr2 = upd7210_rd(u, ISR2);
if (u->busy == 0 || u->irq == NULL || !u->irq(u, 1)) {
#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
}
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 intr __unused)
{
int i;
if (u->rreg[ISR1] & 1) {
i = upd7210_rd(u, DIR);
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)
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);
DELAY(10000);
upd7210_wr(u, AUXMR, C_ICR | 8);
DELAY(1000);
upd7210_wr(u, ADR, 0x60);
upd7210_wr(u, ADR, 0xe0);
upd7210_wr(u, ADMR, 0x70);
upd7210_wr(u, AUXMR, AUXMR_PON);
upd7210_wr(u, IMR1, 0x01);
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;
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->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);
}
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