freebsd-dev/sys/dev/ppc/ppc_isa.c
2013-02-21 00:26:31 +00:00

275 lines
6.8 KiB
C

/*-
* Copyright (c) 1997-2000 Nicolas Souchu
* Copyright (c) 2001 Alcove - Nicolas Souchu
* Copyright (c) 2006 Marcel Moolenaar
* 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <isa/isavar.h>
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/ppb_msq.h>
#include <dev/ppc/ppcvar.h>
#include <dev/ppc/ppcreg.h>
#include "ppbus_if.h"
static int ppc_isa_probe(device_t dev);
int ppc_isa_attach(device_t dev);
int ppc_isa_write(device_t, char *, int, int);
static device_method_t ppc_isa_methods[] = {
/* device interface */
DEVMETHOD(device_probe, ppc_isa_probe),
DEVMETHOD(device_attach, ppc_isa_attach),
DEVMETHOD(device_detach, ppc_detach),
/* bus interface */
DEVMETHOD(bus_read_ivar, ppc_read_ivar),
DEVMETHOD(bus_write_ivar, ppc_write_ivar),
DEVMETHOD(bus_alloc_resource, ppc_alloc_resource),
DEVMETHOD(bus_release_resource, ppc_release_resource),
/* ppbus interface */
DEVMETHOD(ppbus_io, ppc_io),
DEVMETHOD(ppbus_exec_microseq, ppc_exec_microseq),
DEVMETHOD(ppbus_reset_epp, ppc_reset_epp),
DEVMETHOD(ppbus_setmode, ppc_setmode),
DEVMETHOD(ppbus_ecp_sync, ppc_ecp_sync),
DEVMETHOD(ppbus_read, ppc_read),
DEVMETHOD(ppbus_write, ppc_isa_write),
{ 0, 0 }
};
static driver_t ppc_isa_driver = {
ppc_driver_name,
ppc_isa_methods,
sizeof(struct ppc_data),
};
static struct isa_pnp_id lpc_ids[] = {
{ 0x0004d041, "Standard parallel printer port" }, /* PNP0400 */
{ 0x0104d041, "ECP parallel printer port" }, /* PNP0401 */
{ 0 }
};
static void
ppc_isa_dmadone(struct ppc_data *ppc)
{
isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt,
ppc->ppc_dmachan);
}
int
ppc_isa_attach(device_t dev)
{
struct ppc_data *ppc = device_get_softc(dev);
if ((ppc->ppc_avm & PPB_ECP) && (ppc->ppc_dmachan > 0)) {
/* acquire the DMA channel forever */ /* XXX */
isa_dma_acquire(ppc->ppc_dmachan);
isa_dmainit(ppc->ppc_dmachan, 1024); /* nlpt.BUFSIZE */
ppc->ppc_dmadone = ppc_isa_dmadone;
}
return (ppc_attach(dev));
}
static int
ppc_isa_probe(device_t dev)
{
device_t parent;
int error;
parent = device_get_parent(dev);
error = ISA_PNP_PROBE(parent, dev, lpc_ids);
if (error == ENXIO)
return (ENXIO);
if (error != 0) /* XXX shall be set after detection */
device_set_desc(dev, "Parallel port");
return (ppc_probe(dev, 0));
}
/*
* Call this function if you want to send data in any advanced mode
* of your parallel port: FIFO, DMA
*
* If what you want is not possible (no ECP, no DMA...),
* EINVAL is returned
*/
int
ppc_isa_write(device_t dev, char *buf, int len, int how)
{
struct ppc_data *ppc = device_get_softc(dev);
char ecr, ecr_sav, ctr, ctr_sav;
int error = 0;
int spin;
PPC_ASSERT_LOCKED(ppc);
if (!(ppc->ppc_avm & PPB_ECP))
return (EINVAL);
if (ppc->ppc_dmachan == 0)
return (EINVAL);
#ifdef PPC_DEBUG
printf("w");
#endif
ecr_sav = r_ecr(ppc);
ctr_sav = r_ctr(ppc);
/*
* Send buffer with DMA, FIFO and interrupts
*/
/* byte mode, no intr, no DMA, dir=0, flush fifo */
ecr = PPC_ECR_STD | PPC_DISABLE_INTR;
w_ecr(ppc, ecr);
/* disable nAck interrupts */
ctr = r_ctr(ppc);
ctr &= ~IRQENABLE;
w_ctr(ppc, ctr);
ppc->ppc_dmaflags = 0;
ppc->ppc_dmaddr = (caddr_t)buf;
ppc->ppc_dmacnt = (u_int)len;
switch (ppc->ppc_mode) {
case PPB_COMPATIBLE:
/* compatible mode with FIFO, no intr, DMA, dir=0 */
ecr = PPC_ECR_FIFO | PPC_DISABLE_INTR | PPC_ENABLE_DMA;
break;
case PPB_ECP:
ecr = PPC_ECR_ECP | PPC_DISABLE_INTR | PPC_ENABLE_DMA;
break;
default:
error = EINVAL;
goto error;
}
w_ecr(ppc, ecr);
ecr = r_ecr(ppc);
ppc->ppc_dmastat = PPC_DMA_INIT;
/* enable interrupts */
ecr &= ~PPC_SERVICE_INTR;
ppc->ppc_irqstat = PPC_IRQ_DMA;
w_ecr(ppc, ecr);
isa_dmastart(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt,
ppc->ppc_dmachan);
ppc->ppc_dmastat = PPC_DMA_STARTED;
#ifdef PPC_DEBUG
printf("s%d", ppc->ppc_dmacnt);
#endif
/* Wait for the DMA completed interrupt. We hope we won't
* miss it, otherwise a signal will be necessary to unlock the
* process.
*/
do {
/* release CPU */
error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH,
"ppcdma", 0);
} while (error == EWOULDBLOCK);
if (error) {
#ifdef PPC_DEBUG
printf("i");
#endif
/* stop DMA */
isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr,
ppc->ppc_dmacnt, ppc->ppc_dmachan);
/* no dma, no interrupt, flush the fifo */
w_ecr(ppc, PPC_ECR_RESET);
ppc->ppc_dmastat = PPC_DMA_INTERRUPTED;
goto error;
}
/* wait for an empty fifo */
while (!(r_ecr(ppc) & PPC_FIFO_EMPTY)) {
for (spin=100; spin; spin--)
if (r_ecr(ppc) & PPC_FIFO_EMPTY)
goto fifo_empty;
#ifdef PPC_DEBUG
printf("Z");
#endif
error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH,
"ppcfifo", hz / 100);
if (error != EWOULDBLOCK) {
#ifdef PPC_DEBUG
printf("I");
#endif
/* no dma, no interrupt, flush the fifo */
w_ecr(ppc, PPC_ECR_RESET);
ppc->ppc_dmastat = PPC_DMA_INTERRUPTED;
error = EINTR;
goto error;
}
}
fifo_empty:
/* no dma, no interrupt, flush the fifo */
w_ecr(ppc, PPC_ECR_RESET);
error:
/* PDRQ must be kept unasserted until nPDACK is
* deasserted for a minimum of 350ns (SMC datasheet)
*
* Consequence may be a FIFO that never empty
*/
DELAY(1);
w_ecr(ppc, ecr_sav);
w_ctr(ppc, ctr_sav);
return (error);
}
DRIVER_MODULE(ppc, isa, ppc_isa_driver, ppc_devclass, 0, 0);