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 * 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@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