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dev_disk.c revision 1.2 
      1 /*	$NetBSD: dev_disk.c,v 1.2 2005/01/22 15:36:11 chs Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * This module implements a "raw device" interface suitable for
     41  * use by the stand-alone I/O library UFS file-system code, and
     42  * possibly for direct access (i.e. boot from tape).
     43  *
     44  * The implementation is deceptively simple because it uses the
     45  * drivers provided by the Sun PROM monitor.  Note that only the
     46  * PROM driver used to load the boot program is available here.
     47  */
     48 
     49 #include <sys/types.h>
     50 #include <machine/mon.h>
     51 #include <machine/stdarg.h>
     52 #include <stand.h>
     53 
     54 #include "libsa.h"
     55 #include "dvma.h"
     56 #include "saio.h"
     57 #include "dev_disk.h"
     58 
     59 #define RETRY_COUNT 5
     60 
     61 int disk_opencount;
     62 struct saioreq disk_ioreq;
     63 
     64 int
     65 disk_open(struct open_file *f, ...)
     66 {
     67 	struct bootparam *bp;
     68 	struct saioreq *si;
     69 	int error;
     70 
     71 #ifdef DEBUG_PROM
     72 	char *devname;		/* Device part of file name (or NULL). */
     73 	va_list ap;
     74 
     75 	va_start(ap, f);
     76 	devname = va_arg(ap, char *);
     77 	if (debug)
     78 		printf("disk_open: %s\n", devname);
     79 	va_end(ap);
     80 #endif
     81 
     82 	si = &disk_ioreq;
     83 	if (disk_opencount == 0) {
     84 		/*
     85 		 * Setup our part of the saioreq.
     86 		 * (determines what gets opened)
     87 		 */
     88 		bp = *romVectorPtr->bootParam;
     89 		si->si_boottab = bp->bootDevice;
     90 		si->si_ctlr = bp->ctlrNum;
     91 		si->si_unit = bp->unitNum;
     92 		si->si_boff = bp->partNum;
     93 		if ((error = prom_iopen(si)) != 0)
     94 			return (error);
     95 	}
     96 	disk_opencount++;
     97 
     98 	f->f_devdata = si;
     99 	return 0;
    100 }
    101 
    102 int
    103 disk_close(struct open_file *f)
    104 {
    105 	struct saioreq *si;
    106 
    107 #ifdef DEBUG_PROM
    108 	if (debug)
    109 		printf("disk_close: ocnt=%d\n", disk_opencount);
    110 #endif
    111 
    112 	si = f->f_devdata;
    113 	f->f_devdata = NULL;
    114 	if (disk_opencount <= 0)
    115 		return 0;
    116 	if (--disk_opencount == 0)
    117 		prom_iclose(si);
    118 	return 0;
    119 }
    120 
    121 int
    122 disk_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf,
    123     size_t *rsize)
    124 {
    125 	struct saioreq *si;
    126 	struct boottab *ops;
    127 	char *dmabuf;
    128 	int retry, si_flag, xcnt;
    129 
    130 	si = devdata;
    131 	ops = si->si_boottab;
    132 
    133 #ifdef DEBUG_PROM
    134 	if (debug > 1)
    135 		printf("disk_strategy: size=%d dblk=%d\n", size, dblk);
    136 #endif
    137 
    138 	dmabuf = dvma_mapin(buf, size);
    139 	si_flag = (flag == F_READ) ? SAIO_F_READ : SAIO_F_WRITE;
    140 
    141 	/*
    142 	 * The PROM strategy will occasionally return -1 and expect
    143 	 * us to try again.  From mouse (at) Collatz.McRCIM.McGill.EDU
    144 	 */
    145 	retry = RETRY_COUNT;
    146 	do {
    147 		si->si_bn = dblk;
    148 		si->si_ma = dmabuf;
    149 		si->si_cc = size;
    150 		xcnt = (*ops->b_strategy)(si, si_flag);
    151 	} while ((xcnt <= 0) && (--retry > 0));
    152 
    153 	dvma_mapout(dmabuf, size);
    154 
    155 #ifdef DEBUG_PROM
    156 	if (debug > 1)
    157 		printf("disk_strategy: xcnt = %x retries=%d\n",
    158 		   xcnt, RETRY_COUNT - retry);
    159 #endif
    160 
    161 	if (xcnt <= 0)
    162 		return (EIO);
    163 
    164 	*rsize = xcnt;
    165 	return (0);
    166 }
    167 
    168 int
    169 disk_ioctl(struct open_file *f, u_long cmd, void *data)
    170 {
    171 	return EIO;
    172 }
    173 
    174