FreeBSD-5.3/sys/dev/ppbus/ppi.c
/*-
* Copyright (c) 1997, 1998, 1999 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.
*
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/dev/ppbus/ppi.c,v 1.38 2004/07/09 16:56:46 cognet Exp $");
#include "opt_ppb_1284.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <sys/fcntl.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/ppb_msq.h>
#ifdef PERIPH_1284
#include <dev/ppbus/ppb_1284.h>
#endif
#include <dev/ppbus/ppi.h>
#include "ppbus_if.h"
#include <dev/ppbus/ppbio.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];
#ifdef PERIPH_1284
struct resource *intr_resource; /* interrupt resource */
void *intr_cookie; /* interrupt registration cookie */
#endif /* PERIPH_1284 */
};
#define DEVTOSOFTC(dev) \
((struct ppi_data *)device_get_softc(dev))
#define UNITOSOFTC(unit) \
((struct ppi_data *)devclass_get_softc(ppi_devclass, (unit)))
#define UNITODEVICE(unit) \
(devclass_get_device(ppi_devclass, (unit)))
static devclass_t ppi_devclass;
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;
static struct cdevsw ppi_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = ppiopen,
.d_close = ppiclose,
.d_read = ppiread,
.d_write = ppiwrite,
.d_ioctl = ppiioctl,
.d_name = "ppi",
};
#ifdef PERIPH_1284
static void
ppi_enable_intr(device_t ppidev)
{
char r;
device_t ppbus = device_get_parent(ppidev);
r = ppb_rctr(ppbus);
ppb_wctr(ppbus, r | IRQENABLE);
return;
}
static void
ppi_disable_intr(device_t ppidev)
{
char r;
device_t ppbus = device_get_parent(ppidev);
r = ppb_rctr(ppbus);
ppb_wctr(ppbus, r & ~IRQENABLE);
return;
}
#endif /* PERIPH_1284 */
static void
ppi_identify(driver_t *driver, device_t parent)
{
device_t dev;
dev = device_find_child(parent, "ppi", 0);
if (!dev)
BUS_ADD_CHILD(parent, 0, "ppi", -1);
}
/*
* ppi_probe()
*/
static int
ppi_probe(device_t dev)
{
struct ppi_data *ppi;
/* probe is always ok */
device_set_desc(dev, "Parallel I/O");
ppi = DEVTOSOFTC(dev);
return (0);
}
/*
* ppi_attach()
*/
static int
ppi_attach(device_t dev)
{
#ifdef PERIPH_1284
uintptr_t irq;
int zero = 0;
struct ppi_data *ppi = DEVTOSOFTC(dev);
/* retrive the irq */
BUS_READ_IVAR(device_get_parent(dev), dev, PPBUS_IVAR_IRQ, &irq);
/* declare our interrupt handler */
ppi->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
&zero, irq, irq, 1, RF_ACTIVE);
#endif /* PERIPH_1284 */
make_dev(&ppi_cdevsw, device_get_unit(dev), /* XXX cleanup */
UID_ROOT, GID_WHEEL,
0600, "ppi%d", device_get_unit(dev));
return (0);
}
#ifdef PERIPH_1284
/*
* 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(void *arg)
{
device_t ppidev = (device_t)arg;
device_t ppbus = device_get_parent(ppidev);
struct ppi_data *ppi = DEVTOSOFTC(ppidev);
ppi_disable_intr(ppidev);
switch (ppb_1284_get_state(ppbus)) {
/* accept IEEE1284 negotiation then wakeup a waiting process to
* continue negotiation at process level */
case PPB_FORWARD_IDLE:
/* Event 1 */
if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) ==
(SELECT | nBUSY)) {
/* IEEE1284 negotiation */
#ifdef DEBUG_1284
printf("N");
#endif
/* Event 2 - prepare for reading the ext. value */
ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN);
ppb_1284_set_state(ppbus, PPB_NEGOCIATION);
} else {
#ifdef DEBUG_1284
printf("0x%x", ppb_rstr(ppbus));
#endif
ppb_peripheral_terminate(ppbus, PPB_DONTWAIT);
break;
}
/* wake up any process waiting for negotiation 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", ppb_1284_get_state(ppbus));
#endif
ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE);
ppb_set_mode(ppbus, PPB_COMPATIBLE);
break;
}
ppi_enable_intr(ppidev);
return;
}
#endif /* PERIPH_1284 */
static int
ppiopen(struct cdev *dev, int flags, int fmt, struct thread *td)
{
u_int unit = minor(dev);
struct ppi_data *ppi = UNITOSOFTC(unit);
device_t ppidev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(ppidev);
int res;
if (!ppi)
return (ENXIO);
if (!(ppi->ppi_flags & HAVE_PPBUS)) {
if ((res = ppb_request_bus(ppbus, ppidev,
(flags & O_NONBLOCK) ? PPB_DONTWAIT :
(PPB_WAIT | PPB_INTR))))
return (res);
ppi->ppi_flags |= HAVE_PPBUS;
#ifdef PERIPH_1284
if (ppi->intr_resource) {
/* register our interrupt handler */
BUS_SETUP_INTR(device_get_parent(ppidev), ppidev, ppi->intr_resource,
INTR_TYPE_TTY, ppiintr, dev, &ppi->intr_cookie);
}
#endif /* PERIPH_1284 */
}
ppi->ppi_count += 1;
return (0);
}
static int
ppiclose(struct cdev *dev, int flags, int fmt, struct thread *td)
{
u_int unit = minor(dev);
struct ppi_data *ppi = UNITOSOFTC(unit);
device_t ppidev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(ppidev);
ppi->ppi_count --;
if (!ppi->ppi_count) {
#ifdef PERIPH_1284
switch (ppb_1284_get_state(ppbus)) {
case PPB_PERIPHERAL_IDLE:
ppb_peripheral_terminate(ppbus, 0);
break;
case PPB_REVERSE_IDLE:
case PPB_EPP_IDLE:
case PPB_ECP_FORWARD_IDLE:
default:
ppb_1284_terminate(ppbus);
break;
}
#endif /* PERIPH_1284 */
/* unregistration of interrupt forced by release */
ppb_release_bus(ppbus, ppidev);
ppi->ppi_flags &= ~HAVE_PPBUS;
}
return (0);
}
/*
* ppiread()
*
* IEEE1284 compliant read.
*
* First, try negotiation to BYTE then NIBBLE mode
* If no data is available, wait for it otherwise transfer as much as possible
*/
static int
ppiread(struct cdev *dev, struct uio *uio, int ioflag)
{
#ifdef PERIPH_1284
u_int unit = minor(dev);
struct ppi_data *ppi = UNITOSOFTC(unit);
device_t ppidev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(ppidev);
int len, error = 0;
switch (ppb_1284_get_state(ppbus)) {
case PPB_PERIPHERAL_IDLE:
ppb_peripheral_terminate(ppbus, 0);
/* FALLTHROUGH */
case PPB_FORWARD_IDLE:
/* if can't negotiate NIBBLE mode then try BYTE mode,
* the peripheral may be a computer
*/
if ((ppb_1284_negociate(ppbus,
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(ppbus,
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(ppbus, 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 negotiation (IEEE1284 device detection) is
* done at interrupt level, then the remaining is done by the writing
* process
*
* Once negotiation done, transfer data
*/
static int
ppiwrite(struct cdev *dev, struct uio *uio, int ioflag)
{
#ifdef PERIPH_1284
u_int unit = minor(dev);
struct ppi_data *ppi = UNITOSOFTC(unit);
device_t ppidev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(ppidev);
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)
};
/* negotiate ECP mode */
if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) {
printf("ppiwrite: ECP negotiation 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(ppbus, msq, &ret);
}
#endif
/* we have to be peripheral to be able to send data, so
* wait for the appropriate state
*/
if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION)
ppb_1284_terminate(ppbus);
while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) {
/* XXX should check a variable before sleeping */
#ifdef DEBUG_1284
printf("s");
#endif
ppi_enable_intr(ppidev);
/* sleep until IEEE1284 negotiation starts */
error = tsleep(ppi, PCATCH | PPBPRI, "ppiwrite", 0);
switch (error) {
case 0:
/* negotiate peripheral side with BYTE mode */
ppb_peripheral_negociate(ppbus, PPB_BYTE, 0);
break;
case EWOULDBLOCK:
break;
default:
goto error;
}
}
#ifdef DEBUG_1284
printf("N");
#endif
/* negotiation 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(ppbus,
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(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
{
u_int unit = minor(dev);
device_t ppidev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(ppidev);
int error = 0;
u_int8_t *val = (u_int8_t *)data;
switch (cmd) {
case PPIGDATA: /* get data register */
*val = ppb_rdtr(ppbus);
break;
case PPIGSTATUS: /* get status bits */
*val = ppb_rstr(ppbus);
break;
case PPIGCTRL: /* get control bits */
*val = ppb_rctr(ppbus);
break;
case PPIGEPPD: /* get EPP data bits */
*val = ppb_repp_D(ppbus);
break;
case PPIGECR: /* get ECP bits */
*val = ppb_recr(ppbus);
break;
case PPIGFIFO: /* read FIFO */
*val = ppb_rfifo(ppbus);
break;
case PPISDATA: /* set data register */
ppb_wdtr(ppbus, *val);
break;
case PPISSTATUS: /* set status bits */
ppb_wstr(ppbus, *val);
break;
case PPISCTRL: /* set control bits */
ppb_wctr(ppbus, *val);
break;
case PPISEPPD: /* set EPP data bits */
ppb_wepp_D(ppbus, *val);
break;
case PPISECR: /* set ECP bits */
ppb_wecr(ppbus, *val);
break;
case PPISFIFO: /* write FIFO */
ppb_wfifo(ppbus, *val);
break;
case PPIGEPPA: /* get EPP address bits */
*val = ppb_repp_A(ppbus);
break;
case PPISEPPA: /* set EPP address bits */
ppb_wepp_A(ppbus, *val);
break;
default:
error = ENOTTY;
break;
}
return (error);
}
static device_method_t ppi_methods[] = {
/* device interface */
DEVMETHOD(device_identify, ppi_identify),
DEVMETHOD(device_probe, ppi_probe),
DEVMETHOD(device_attach, ppi_attach),
{ 0, 0 }
};
static driver_t ppi_driver = {
"ppi",
ppi_methods,
sizeof(struct ppi_data),
};
DRIVER_MODULE(ppi, ppbus, ppi_driver, ppi_devclass, 0, 0);