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freebsd/sys/dev/ppbus/ppb_base.c
2000-10-15 14:19:01 +00:00

196 lines
4.2 KiB
C

/*-
* Copyright (c) 1997, 1998, 1999 Nicolas Souchu
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <dev/ppbus/ppbconf.h>
#include "ppbus_if.h"
#include <dev/ppbus/ppbio.h>
#define DEVTOSOFTC(dev) ((struct ppb_data *)device_get_softc(dev))
/*
* ppb_poll_bus()
*
* Polls the bus
*
* max is a delay in 10-milliseconds
*/
int
ppb_poll_bus(device_t bus, int max,
char mask, char status, int how)
{
int i, j, error;
char r;
/* try at least up to 10ms */
for (j = 0; j < ((how & PPB_POLL) ? max : 1); j++) {
for (i = 0; i < 10000; i++) {
r = ppb_rstr(bus);
DELAY(1);
if ((r & mask) == status)
return (0);
}
}
if (!(how & PPB_POLL)) {
for (i = 0; max == PPB_FOREVER || i < max-1; i++) {
if ((ppb_rstr(bus) & mask) == status)
return (0);
switch (how) {
case PPB_NOINTR:
/* wait 10 ms */
tsleep((caddr_t)bus, PPBPRI, "ppbpoll", hz/100);
break;
case PPB_INTR:
default:
/* wait 10 ms */
if (((error = tsleep((caddr_t)bus, PPBPRI | PCATCH,
"ppbpoll", hz/100)) != EWOULDBLOCK) != 0) {
return (error);
}
break;
}
}
}
return (EWOULDBLOCK);
}
/*
* ppb_get_epp_protocol()
*
* Return the chipset EPP protocol
*/
int
ppb_get_epp_protocol(device_t bus)
{
uintptr_t protocol;
BUS_READ_IVAR(device_get_parent(bus), bus, PPC_IVAR_EPP_PROTO, &protocol);
return (protocol);
}
/*
* ppb_get_mode()
*
*/
int
ppb_get_mode(device_t bus)
{
struct ppb_data *ppb = DEVTOSOFTC(bus);
/* XXX yet device mode = ppbus mode = chipset mode */
return (ppb->mode);
}
/*
* ppb_set_mode()
*
* Set the operating mode of the chipset, return the previous mode
*/
int
ppb_set_mode(device_t bus, int mode)
{
struct ppb_data *ppb = DEVTOSOFTC(bus);
int old_mode = ppb_get_mode(bus);
if (PPBUS_SETMODE(device_get_parent(bus), mode))
return -1;
/* XXX yet device mode = ppbus mode = chipset mode */
ppb->mode = (mode & PPB_MASK);
return (old_mode);
}
/*
* ppb_write()
*
* Write charaters to the port
*/
int
ppb_write(device_t bus, char *buf, int len, int how)
{
return (PPBUS_WRITE(device_get_parent(bus), buf, len, how));
}
/*
* ppb_reset_epp_timeout()
*
* Reset the EPP timeout bit in the status register
*/
int
ppb_reset_epp_timeout(device_t bus)
{
return(PPBUS_RESET_EPP(device_get_parent(bus)));
}
/*
* ppb_ecp_sync()
*
* Wait for the ECP FIFO to be empty
*/
int
ppb_ecp_sync(device_t bus)
{
return (PPBUS_ECP_SYNC(device_get_parent(bus)));
}
/*
* ppb_get_status()
*
* Read the status register and update the status info
*/
int
ppb_get_status(device_t bus, struct ppb_status *status)
{
register char r;
r = status->status = ppb_rstr(bus);
status->timeout = r & TIMEOUT;
status->error = !(r & nFAULT);
status->select = r & SELECT;
status->paper_end = r & PERROR;
status->ack = !(r & nACK);
status->busy = !(r & nBUSY);
return (0);
}