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/* $NetBSD: dev_disk.c,v 1.4 1996/04/10 18:31:14 gwr Exp $ */
/*
* Copyright (c) 1993 Paul Kranenburg
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/*
* 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>
#include <machine/saio.h>
#include "stand.h"
#include "dvma.h"
#include "promdev.h"
#define RETRY_COUNT 5
extern int debug;
int disk_opencount;
struct saioreq disk_ioreq;
int
disk_open(f, devname)
struct open_file *f;
char *devname; /* Device part of file name (or NULL). */
{
struct bootparam *bp;
struct saioreq *si;
int error;
#ifdef DEBUG_PROM
if (debug)
printf("disk_open: %s\n", devname);
#endif
si = &disk_ioreq;
if (disk_opencount == 0) {
/*
* Setup our part of the saioreq.
* (determines what gets opened)
*/
bp = *romp->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++;
f->f_devdata = si;
return 0;
}
int
disk_close(f)
struct open_file *f;
{
struct saioreq *si;
#ifdef DEBUG_PROM
if (debug)
printf("disk_close: ocnt=%d\n", disk_opencount);
#endif
si = f->f_devdata;
f->f_devdata = NULL;
if (disk_opencount <= 0)
return 0;
if (--disk_opencount == 0)
prom_iclose(si);
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;
si = devdata;
ops = si->si_boottab;
#ifdef DEBUG_PROM
if (debug > 1)
printf("disk_strategy: size=%d dblk=%d\n", size, dblk);
#endif
dmabuf = dvma_mapin(buf, size);
si_flag = (flag == F_READ) ? SAIO_F_READ : SAIO_F_WRITE;
/*
* 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));
dvma_mapout(dmabuf, size);
#ifdef DEBUG_PROM
if (debug > 1)
printf("disk_strategy: xcnt = %x retries=%d\n",
xcnt, RETRY_COUNT - retry);
#endif
if (xcnt <= 0)
return (EIO);
*rsize = xcnt;
return (0);
}
int
disk_ioctl()
{
return EIO;
}
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