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/*-
* Copyright (c) 1997 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.
*
* $Id: ppb_1284.c,v 1.4 1998/08/03 19:14:31 msmith Exp $
*
*/
#include "opt_debug_1284.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/clock.h>
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/ppb_1284.h>
/*
* do_1284_wait()
*
* Wait for the peripherial up to 40ms
*/
int
do_1284_wait(struct ppb_device *dev, char mask, char status)
{
int i;
char r;
/* try up to 5ms */
for (i = 0; i < 20; i++) {
r = ppb_rstr(dev);
DELAY(25);
if ((r & mask) == status)
return (0);
}
return (ppb_poll_device(dev, 4, mask, status, PPB_NOINTR));
}
#define nibble2char(s) (((s & ~nACK) >> 3) | (~s & nBUSY) >> 4)
/*
* byte_1284_inbyte()
*
* Read 1 byte in BYTE mode
*/
int
byte_1284_inbyte(struct ppb_device *dev, char *buffer)
{
int error;
/* notify the peripherial to put data on the lines */
ppb_wctr(dev, PCD | AUTOFEED | nSTROBE | nINIT | nSELECTIN);
/* wait for valid byte signal */
if ((error = do_1284_wait(dev, nACK, 0)))
return (error);
/* fetch data */
*buffer = ppb_rdtr(dev);
/* indicate that data has been received, not ready for another */
ppb_wctr(dev, PCD | nAUTOFEED | nSTROBE | nINIT | nSELECTIN);
/* wait peripherial's acknowledgement */
if ((error = do_1284_wait(dev, nACK, nACK)))
return (error);
/* acknowledge the peripherial */
ppb_wctr(dev, PCD | nAUTOFEED | STROBE | nINIT | nSELECTIN);
return (0);
}
/*
* nibble_1284_inbyte()
*
* Read 1 byte in NIBBLE mode
*/
int
nibble_1284_inbyte(struct ppb_device *dev, char *buffer)
{
char nibble[2];
int i, error;
for (i = 0; i < 2; i++) {
/* ready to take data (nAUTO low) */
ppb_wctr(dev, AUTOFEED & ~(STROBE | SELECTIN));
if ((error = do_1284_wait(dev, nACK, 0)))
return (error);
/* read nibble */
nibble[i] = ppb_rstr(dev);
/* ack, not ready for another nibble */
ppb_wctr(dev, 0 & ~(AUTOFEED | STROBE | SELECTIN));
/* wait ack from peripherial */
if ((error = do_1284_wait(dev, nACK, nACK)))
return (error);
}
*buffer = ((nibble2char(nibble[1]) << 4) & 0xf0) |
(nibble2char(nibble[0]) & 0x0f);
return (0);
}
/*
* nibble_1284_sync()
*/
void
nibble_1284_sync(struct ppb_device *dev)
{
char ctr;
ctr = ppb_rctr(dev);
ppb_wctr(dev, (ctr & ~AUTOFEED) | SELECTIN);
if (do_1284_wait(dev, nACK, 0))
return;
ppb_wctr(dev, ctr | AUTOFEED);
do_1284_wait(dev, nACK, nACK);
ppb_wctr(dev, (ctr & ~AUTOFEED) | SELECTIN);
return;
}
/*
* ppb_1284_negociate()
*
* Normal nibble mode or request device id mode (see ppb_1284.h)
*/
int
ppb_1284_negociate(struct ppb_device *dev, int mode)
{
int error;
int phase = 0;
ppb_wctr(dev, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED));
DELAY(1);
ppb_wdtr(dev, mode);
DELAY(1);
ppb_wctr(dev, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN));
if ((error = do_1284_wait(dev, nACK | PERROR | SELECT | nFAULT,
PERROR | SELECT | nFAULT)))
goto error;
phase = 1;
ppb_wctr(dev, (nINIT | STROBE | AUTOFEED) & ~SELECTIN);
DELAY(5);
ppb_wctr(dev, nINIT & ~(SELECTIN | AUTOFEED | STROBE));
#if 0 /* not respected by most devices */
if ((error = do_1284_wait(dev, nACK, nACK)))
goto error;
if (mode == 0)
if ((error = do_1284_wait(dev, SELECT, 0)))
goto error;
else
if ((error = do_1284_wait(dev, SELECT, SELECT)))
goto error;
#endif
return (0);
error:
if (bootverbose)
printf("%s: status=0x%x %d\n", __FUNCTION__, ppb_rstr(dev), phase);
return (error);
}
int
ppb_1284_terminate(struct ppb_device *dev, int how)
{
int error;
switch (how) {
case VALID_STATE:
ppb_wctr(dev, SELECTIN & ~(STROBE | AUTOFEED));
if ((error = do_1284_wait(dev, nACK | nBUSY | nFAULT, nFAULT)))
return (error);
ppb_wctr(dev, (SELECTIN | AUTOFEED) & ~STROBE);
if ((error = do_1284_wait(dev, nACK, nACK)))
return (error);
ppb_wctr(dev, SELECTIN & ~(STROBE | AUTOFEED));
break;
default:
return (EINVAL);
}
return (0);
}
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