1 /* $NetBSD: dev_disk.c,v 1.4 2008/04/28 20:23:39 martin 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 } 166 167