NetBSD/sys/arch/sun3/stand/libsa/dev_disk.c

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/* $NetBSD: dev_disk.c,v 1.7 1998/09/05 15:28:07 pk Exp $ */
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/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
*
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* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
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* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
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*/
/*
* This module implements a "raw device" interface suitable for
* use by the stand-alone I/O library UFS file-system code, and
* possibly for direct access (i.e. boot from tape).
*
* The implementation is deceptively simple because it uses the
* drivers provided by the Sun PROM monitor. Note that only the
* PROM driver used to load the boot program is available here.
*/
#include <sys/types.h>
#include <machine/mon.h>
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#include <stand.h>
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#include "libsa.h"
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#include "dvma.h"
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#include "saio.h"
/* #include "dev_disk.h" XXX - stdarg woes */
#define RETRY_COUNT 5
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int disk_opencount;
struct saioreq disk_ioreq;
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int
disk_open(f, devname)
struct open_file *f;
char *devname; /* Device part of file name (or NULL). */
{
struct bootparam *bp;
struct saioreq *si;
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int error;
#ifdef DEBUG_PROM
if (debug)
printf("disk_open: %s\n", devname);
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#endif
si = &disk_ioreq;
if (disk_opencount == 0) {
/*
* Setup our part of the saioreq.
* (determines what gets opened)
*/
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bp = *romVectorPtr->bootParam;
si->si_boottab = bp->bootDevice;
si->si_ctlr = bp->ctlrNum;
si->si_unit = bp->unitNum;
si->si_boff = bp->partNum;
if ((error = prom_iopen(si)) != 0)
return (error);
}
disk_opencount++;
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f->f_devdata = si;
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return 0;
}
int
disk_close(f)
struct open_file *f;
{
struct saioreq *si;
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#ifdef DEBUG_PROM
if (debug)
printf("disk_close: ocnt=%d\n", disk_opencount);
#endif
si = f->f_devdata;
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f->f_devdata = NULL;
if (disk_opencount <= 0)
return 0;
if (--disk_opencount == 0)
prom_iclose(si);
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return 0;
}
int
disk_strategy(devdata, flag, dblk, size, buf, rsize)
void *devdata;
int flag;
daddr_t dblk;
u_int size;
char *buf;
u_int *rsize;
{
struct saioreq *si;
struct boottab *ops;
char *dmabuf;
int retry, si_flag, xcnt;
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si = devdata;
ops = si->si_boottab;
#ifdef DEBUG_PROM
if (debug > 1)
printf("disk_strategy: size=%d dblk=%d\n", size, dblk);
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#endif
dmabuf = dvma_mapin(buf, size);
si_flag = (flag == F_READ) ? SAIO_F_READ : SAIO_F_WRITE;
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/*
* The PROM strategy will occasionally return -1 and expect
* us to try again. From mouse@Collatz.McRCIM.McGill.EDU
*/
retry = RETRY_COUNT;
do {
si->si_bn = dblk;
si->si_ma = dmabuf;
si->si_cc = size;
xcnt = (*ops->b_strategy)(si, si_flag);
} while ((xcnt <= 0) && (--retry > 0));
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dvma_mapout(dmabuf, size);
#ifdef DEBUG_PROM
if (debug > 1)
printf("disk_strategy: xcnt = %x retries=%d\n",
xcnt, RETRY_COUNT - retry);
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#endif
if (xcnt <= 0)
return (EIO);
*rsize = xcnt;
return (0);
}
int
disk_ioctl()
{
return EIO;
}