freebsd-dev/sys/dev/ppbus/ppi.c
Poul-Henning Kamp d6a0e38a1b Remove five now unused fields from struct cdevsw. They should never
have been there in the first place.  A GENERIC kernel shrinks almost 1k.

Add a slightly different safetybelt under nostop for tty drivers.

Add some missing FreeBSD tags
1999-09-25 18:24:47 +00:00

550 lines
12 KiB
C

/*-
* Copyright (c) 1997, 1998 Nicolas Souchu, Michael Smith
* 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.
*
* $FreeBSD$
*
*/
#include "ppi.h"
#if NPPI > 0
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>
#include <machine/clock.h>
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/ppb_msq.h>
#include "opt_ppb_1284.h"
#ifdef PERIPH_1284
#include <dev/ppbus/ppb_1284.h>
#endif
#include <dev/ppbus/ppi.h>
#define BUFSIZE 512
struct ppi_data {
int ppi_unit;
int ppi_flags;
#define HAVE_PPBUS (1<<0)
#define HAD_PPBUS (1<<1)
int ppi_count;
int ppi_mode; /* IEEE1284 mode */
char ppi_buffer[BUFSIZE];
struct ppb_device ppi_dev;
};
#define MAXPPI 8 /* XXX not much better! */
static int nppi = 0;
static struct ppi_data *ppidata[MAXPPI];
/*
* Make ourselves visible as a ppbus driver
*/
static struct ppb_device *ppiprobe(struct ppb_data *ppb);
static int ppiattach(struct ppb_device *dev);
static void ppiintr(int unit);
static struct ppb_driver ppidriver = {
ppiprobe, ppiattach, "ppi"
};
DATA_SET(ppbdriver_set, ppidriver);
static d_open_t ppiopen;
static d_close_t ppiclose;
static d_ioctl_t ppiioctl;
static d_write_t ppiwrite;
static d_read_t ppiread;
#define CDEV_MAJOR 82
static struct cdevsw ppi_cdevsw = {
/* open */ ppiopen,
/* close */ ppiclose,
/* read */ ppiread,
/* write */ ppiwrite,
/* ioctl */ ppiioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "ppi",
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
/* bmaj */ -1
};
#ifdef PERIPH_1284
static void
ppi_enable_intr(struct ppi_data *ppi)
{
char r;
r = ppb_rctr(&ppi->ppi_dev);
ppb_wctr(&ppi->ppi_dev, r | IRQENABLE);
return;
}
static void
ppi_disable_intr(struct ppi_data *ppi)
{
char r;
r = ppb_rctr(&ppi->ppi_dev);
ppb_wctr(&ppi->ppi_dev, r & ~IRQENABLE);
return;
}
#endif /* PERIPH_1284 */
/*
* ppiprobe()
*/
static struct ppb_device *
ppiprobe(struct ppb_data *ppb)
{
struct ppi_data *ppi;
static int once;
if (!once++)
cdevsw_add(&ppi_cdevsw);
ppi = (struct ppi_data *) malloc(sizeof(struct ppi_data),
M_TEMP, M_NOWAIT);
if (!ppi) {
printf("ppi: cannot malloc!\n");
return 0;
}
bzero(ppi, sizeof(struct ppi_data));
ppidata[nppi] = ppi;
/*
* ppi dependent initialisation.
*/
ppi->ppi_unit = nppi;
/*
* ppbus dependent initialisation.
*/
ppi->ppi_dev.id_unit = ppi->ppi_unit;
ppi->ppi_dev.ppb = ppb;
ppi->ppi_dev.intr = ppiintr;
/* Ok, go to next device on next probe */
nppi ++;
return &ppi->ppi_dev;
}
static int
ppiattach(struct ppb_device *dev)
{
/*
* Report ourselves
*/
printf("ppi%d: <generic parallel i/o> on ppbus %d\n",
dev->id_unit, dev->ppb->ppb_link->adapter_unit);
return (1);
}
/*
* Cable
* -----
*
* Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks:
*
* nStrobe <-> nAck 1 <-> 10
* nAutofd <-> Busy 11 <-> 14
* nSelectin <-> Select 17 <-> 13
* nInit <-> nFault 15 <-> 16
*
*/
static void
ppiintr(int unit)
{
#ifdef PERIPH_1284
struct ppi_data *ppi = ppidata[unit];
ppi_disable_intr(ppi);
switch (ppi->ppi_dev.ppb->state) {
/* accept IEEE1284 negociation then wakeup an waiting process to
* continue negociation at process level */
case PPB_FORWARD_IDLE:
/* Event 1 */
if ((ppb_rstr(&ppi->ppi_dev) & (SELECT | nBUSY)) ==
(SELECT | nBUSY)) {
/* IEEE1284 negociation */
#ifdef DEBUG_1284
printf("N");
#endif
/* Event 2 - prepare for reading the ext. value */
ppb_wctr(&ppi->ppi_dev, (PCD | STROBE | nINIT) & ~SELECTIN);
ppi->ppi_dev.ppb->state = PPB_NEGOCIATION;
} else {
#ifdef DEBUG_1284
printf("0x%x", ppb_rstr(&ppi->ppi_dev));
#endif
ppb_peripheral_terminate(&ppi->ppi_dev, PPB_DONTWAIT);
break;
}
/* wake up any process waiting for negociation from
* remote master host */
/* XXX should set a variable to warn the process about
* the interrupt */
wakeup(ppi);
break;
default:
#ifdef DEBUG_1284
printf("?%d", ppi->ppi_dev.ppb->state);
#endif
ppi->ppi_dev.ppb->state = PPB_FORWARD_IDLE;
ppb_set_mode(&ppi->ppi_dev, PPB_COMPATIBLE);
break;
}
ppi_enable_intr(ppi);
#endif /* PERIPH_1284 */
return;
}
static int
ppiopen(dev_t dev, int flags, int fmt, struct proc *p)
{
u_int unit = minor(dev);
struct ppi_data *ppi = ppidata[unit];
int res;
if (unit >= nppi)
return (ENXIO);
if (!(ppi->ppi_flags & HAVE_PPBUS)) {
if ((res = ppb_request_bus(&ppi->ppi_dev,
(flags & O_NONBLOCK) ? PPB_DONTWAIT :
(PPB_WAIT | PPB_INTR))))
return (res);
ppi->ppi_flags |= HAVE_PPBUS;
}
ppi->ppi_count += 1;
return (0);
}
static int
ppiclose(dev_t dev, int flags, int fmt, struct proc *p)
{
u_int unit = minor(dev);
struct ppi_data *ppi = ppidata[unit];
ppi->ppi_count --;
if (!ppi->ppi_count) {
#ifdef PERIPH_1284
switch (ppi->ppi_dev.ppb->state) {
case PPB_PERIPHERAL_IDLE:
ppb_peripheral_terminate(&ppi->ppi_dev, 0);
break;
case PPB_REVERSE_IDLE:
case PPB_EPP_IDLE:
case PPB_ECP_FORWARD_IDLE:
default:
ppb_1284_terminate(&ppi->ppi_dev);
break;
}
#endif /* PERIPH_1284 */
ppb_release_bus(&ppi->ppi_dev);
ppi->ppi_flags &= ~HAVE_PPBUS;
}
return (0);
}
/*
* ppiread()
*
* IEEE1284 compliant read.
*
* First, try negociation to BYTE then NIBBLE mode
* If no data is available, wait for it otherwise transfer as much as possible
*/
static int
ppiread(dev_t dev, struct uio *uio, int ioflag)
{
#ifdef PERIPH_1284
u_int unit = minor(dev);
struct ppi_data *ppi = ppidata[unit];
int len, error = 0;
switch (ppi->ppi_dev.ppb->state) {
case PPB_PERIPHERAL_IDLE:
ppb_peripheral_terminate(&ppi->ppi_dev, 0);
/* fall throught */
case PPB_FORWARD_IDLE:
/* if can't negociate NIBBLE mode then try BYTE mode,
* the peripheral may be a computer
*/
if ((ppb_1284_negociate(&ppi->ppi_dev,
ppi->ppi_mode = PPB_NIBBLE, 0))) {
/* XXX Wait 2 seconds to let the remote host some
* time to terminate its interrupt
*/
tsleep(ppi, PPBPRI, "ppiread", 2*hz);
if ((error = ppb_1284_negociate(&ppi->ppi_dev,
ppi->ppi_mode = PPB_BYTE, 0)))
return (error);
}
break;
case PPB_REVERSE_IDLE:
case PPB_EPP_IDLE:
case PPB_ECP_FORWARD_IDLE:
default:
break;
}
#ifdef DEBUG_1284
printf("N");
#endif
/* read data */
len = 0;
while (uio->uio_resid) {
if ((error = ppb_1284_read(&ppi->ppi_dev, ppi->ppi_mode,
ppi->ppi_buffer, min(BUFSIZE, uio->uio_resid),
&len))) {
goto error;
}
if (!len)
goto error; /* no more data */
#ifdef DEBUG_1284
printf("d");
#endif
if ((error = uiomove(ppi->ppi_buffer, len, uio)))
goto error;
}
error:
#else /* PERIPH_1284 */
int error = ENODEV;
#endif
return (error);
}
/*
* ppiwrite()
*
* IEEE1284 compliant write
*
* Actually, this is the peripheral side of a remote IEEE1284 read
*
* The first part of the negociation (IEEE1284 device detection) is
* done at interrupt level, then the remaining is done by the writing
* process
*
* Once negociation done, transfer data
*/
static int
ppiwrite(dev_t dev, struct uio *uio, int ioflag)
{
#ifdef PERIPH_1284
u_int unit = minor(dev);
struct ppi_data *ppi = ppidata[unit];
struct ppb_data *ppb = ppi->ppi_dev.ppb;
int len, error = 0, sent;
#if 0
int ret;
#define ADDRESS MS_PARAM(0, 0, MS_TYP_PTR)
#define LENGTH MS_PARAM(0, 1, MS_TYP_INT)
struct ppb_microseq msq[] = {
{ MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } },
MS_RET(0)
};
/* negociate ECP mode */
if (ppb_1284_negociate(&ppi->ppi_dev, PPB_ECP, 0)) {
printf("ppiwrite: ECP negociation failed\n");
}
while (!error && (len = min(uio->uio_resid, BUFSIZE))) {
uiomove(ppi->ppi_buffer, len, uio);
ppb_MS_init_msq(msq, 2, ADDRESS, ppi->ppi_buffer, LENGTH, len);
error = ppb_MS_microseq(&ppi->ppi_dev, msq, &ret);
}
#endif
/* we have to be peripheral to be able to send data, so
* wait for the appropriate state
*/
if (ppb->state < PPB_PERIPHERAL_NEGOCIATION)
ppb_1284_terminate(&ppi->ppi_dev);
while (ppb->state != PPB_PERIPHERAL_IDLE) {
/* XXX should check a variable before sleeping */
#ifdef DEBUG_1284
printf("s");
#endif
ppi_enable_intr(ppi);
/* sleep until IEEE1284 negociation starts */
error = tsleep(ppi, PCATCH | PPBPRI, "ppiwrite", 0);
switch (error) {
case 0:
/* negociate peripheral side with BYTE mode */
ppb_peripheral_negociate(&ppi->ppi_dev, PPB_BYTE, 0);
break;
case EWOULDBLOCK:
break;
default:
goto error;
}
}
#ifdef DEBUG_1284
printf("N");
#endif
/* negociation done, write bytes to master host */
while ((len = min(uio->uio_resid, BUFSIZE)) != 0) {
uiomove(ppi->ppi_buffer, len, uio);
if ((error = byte_peripheral_write(&ppi->ppi_dev,
ppi->ppi_buffer, len, &sent)))
goto error;
#ifdef DEBUG_1284
printf("d");
#endif
}
error:
#else /* PERIPH_1284 */
int error = ENODEV;
#endif
return (error);
}
static int
ppiioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
u_int unit = minor(dev);
struct ppi_data *ppi = ppidata[unit];
int error = 0;
u_int8_t *val = (u_int8_t *)data;
switch (cmd) {
case PPIGDATA: /* get data register */
*val = ppb_rdtr(&ppi->ppi_dev);
break;
case PPIGSTATUS: /* get status bits */
*val = ppb_rstr(&ppi->ppi_dev);
break;
case PPIGCTRL: /* get control bits */
*val = ppb_rctr(&ppi->ppi_dev);
break;
case PPIGEPPD: /* get EPP data bits */
*val = ppb_repp_D(&ppi->ppi_dev);
break;
case PPIGECR: /* get ECP bits */
*val = ppb_recr(&ppi->ppi_dev);
break;
case PPIGFIFO: /* read FIFO */
*val = ppb_rfifo(&ppi->ppi_dev);
break;
case PPISDATA: /* set data register */
ppb_wdtr(&ppi->ppi_dev, *val);
break;
case PPISSTATUS: /* set status bits */
ppb_wstr(&ppi->ppi_dev, *val);
break;
case PPISCTRL: /* set control bits */
ppb_wctr(&ppi->ppi_dev, *val);
break;
case PPISEPPD: /* set EPP data bits */
ppb_wepp_D(&ppi->ppi_dev, *val);
break;
case PPISECR: /* set ECP bits */
ppb_wecr(&ppi->ppi_dev, *val);
break;
case PPISFIFO: /* write FIFO */
ppb_wfifo(&ppi->ppi_dev, *val);
break;
case PPIGEPPA: /* get EPP address bits */
*val = ppb_repp_A(&ppi->ppi_dev);
break;
case PPISEPPA: /* set EPP address bits */
ppb_wepp_A(&ppi->ppi_dev, *val);
break;
default:
error = ENOTTY;
break;
}
return (error);
}
#endif /* NPPI */