sys/arch/sun68k/stand/libsa/dev_disk.c

   1 /*      $NetBSD: dev_disk.c,v 1.3 2005/12/11 12:19:29 christos 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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * This module implements a "raw device" interface suitable for
  34  * use by the stand-alone I/O library UFS file-system code, and
  35  * possibly for direct access (i.e. boot from tape).
  36  *
  37  * The implementation is deceptively simple because it uses the
  38  * drivers provided by the Sun PROM monitor.  Note that only the
  39  * PROM driver used to load the boot program is available here.
  40  */
  41
  42 #include <sys/types.h>
  43 #include <machine/mon.h>
  44 #include <machine/stdarg.h>
  45 #include <stand.h>
  46
  47 #include "libsa.h"
  48 #include "dvma.h"
  49 #include "saio.h"
  50 #include "dev_disk.h"
  51
  52 #define RETRY_COUNT 5
  53
  54 int disk_opencount;
  55 struct saioreq disk_ioreq;
  56
  57 int
  58 disk_open(struct open_file *f, ...)
  59 {
  60         struct bootparam *bp;
  61         struct saioreq *si;
  62         int error;
  63
  64 #ifdef DEBUG_PROM
  65         char *devname;          /* Device part of file name (or NULL). */
  66         va_list ap;
  67
  68         va_start(ap, f);
  69         devname = va_arg(ap, char *);
  70         if (debug)
  71                 printf("disk_open: %s\n", devname);
  72         va_end(ap);
  73 #endif
  74
  75         si = &disk_ioreq;
  76         if (disk_opencount == 0) {
  77                 /*
  78                  * Setup our part of the saioreq.
  79                  * (determines what gets opened)
  80                  */
  81                 bp = *romVectorPtr->bootParam;
  82                 si->si_boottab = bp->bootDevice;
  83                 si->si_ctlr = bp->ctlrNum;
  84                 si->si_unit = bp->unitNum;
  85                 si->si_boff = bp->partNum;
  86                 if ((error = prom_iopen(si)) != 0)
  87                         return (error);
  88         }
  89         disk_opencount++;
  90
  91         f->f_devdata = si;
  92         return 0;
  93 }
  94
  95 int
  96 disk_close(struct open_file *f)
  97 {
  98         struct saioreq *si;
  99
 100 #ifdef DEBUG_PROM
 101         if (debug)
 102                 printf("disk_close: ocnt=%d\n", disk_opencount);
 103 #endif
 104
 105         si = f->f_devdata;
 106         f->f_devdata = NULL;
 107         if (disk_opencount <= 0)
 108                 return 0;
 109         if (--disk_opencount == 0)
 110                 prom_iclose(si);
 111         return 0;
 112 }
 113
 114 int
 115 disk_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf,
 116     size_t *rsize)
 117 {
 118         struct saioreq *si;
 119         struct boottab *ops;
 120         char *dmabuf;
 121         int retry, si_flag, xcnt;
 122
 123         si = devdata;
 124         ops = si->si_boottab;
 125
 126 #ifdef DEBUG_PROM
 127         if (debug > 1)
 128                 printf("disk_strategy: size=%d dblk=%d\n", size, dblk);
 129 #endif
 130
 131         dmabuf = dvma_mapin(buf, size);
 132         si_flag = (flag == F_READ) ? SAIO_F_READ : SAIO_F_WRITE;
 133
 134         /*
 135          * The PROM strategy will occasionally return -1 and expect
 136          * us to try again.  From mouse@Collatz.McRCIM.McGill.EDU
 137          */
 138         retry = RETRY_COUNT;
 139         do {
 140                 si->si_bn = dblk;
 141                 si->si_ma = dmabuf;
 142                 si->si_cc = size;
 143                 xcnt = (*ops->b_strategy)(si, si_flag);
 144         } while ((xcnt <= 0) && (--retry > 0));
 145
 146         dvma_mapout(dmabuf, size);
 147
 148 #ifdef DEBUG_PROM
 149         if (debug > 1)
 150                 printf("disk_strategy: xcnt = %x retries=%d\n",
 151                    xcnt, RETRY_COUNT - retry);
 152 #endif
 153
 154         if (xcnt <= 0)
 155                 return (EIO);
 156
 157         *rsize = xcnt;
 158         return (0);
 159 }
 160
 161 int
 162 disk_ioctl(struct open_file *f, u_long cmd, void *data)
 163 {
 164         return EIO;
 165 }
 166