1 /* $NetBSD: dev_disk.c,v 1.5 2011/07/17 20:54:48 joerg 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 <stand.h> 45 46 #include "libsa.h" 47 #include "dvma.h" 48 #include "saio.h" 49 #include "dev_disk.h" 50 51 #define RETRY_COUNT 5 52 53 int disk_opencount; 54 struct saioreq disk_ioreq; 55 56 int 57 disk_open(struct open_file *f, ...) 58 { 59 struct bootparam *bp; 60 struct saioreq *si; 61 int error; 62 63 #ifdef DEBUG_PROM 64 char *devname; /* Device part of file name (or NULL). */ 65 va_list ap; 66 67 va_start(ap, f); 68 devname = va_arg(ap, char *); 69 if (debug) 70 printf("disk_open: %s\n", devname); 71 va_end(ap); 72 #endif 73 74 si = &disk_ioreq; 75 if (disk_opencount == 0) { 76 /* 77 * Setup our part of the saioreq. 78 * (determines what gets opened) 79 */ 80 bp = *romVectorPtr->bootParam; 81 si->si_boottab = bp->bootDevice; 82 si->si_ctlr = bp->ctlrNum; 83 si->si_unit = bp->unitNum; 84 si->si_boff = bp->partNum; 85 if ((error = prom_iopen(si)) != 0) 86 return (error); 87 } 88 disk_opencount++; 89 90 f->f_devdata = si; 91 return 0; 92 } 93 94 int 95 disk_close(struct open_file *f) 96 { 97 struct saioreq *si; 98 99 #ifdef DEBUG_PROM 100 if (debug) 101 printf("disk_close: ocnt=%d\n", disk_opencount); 102 #endif 103 104 si = f->f_devdata; 105 f->f_devdata = NULL; 106 if (disk_opencount <= 0) 107 return 0; 108 if (--disk_opencount == 0) 109 prom_iclose(si); 110 return 0; 111 } 112 113 int 114 disk_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, 115 size_t *rsize) 116 { 117 struct saioreq *si; 118 struct boottab *ops; 119 char *dmabuf; 120 int retry, si_flag, xcnt; 121 122 si = devdata; 123 ops = si->si_boottab; 124 125 #ifdef DEBUG_PROM 126 if (debug > 1) 127 printf("disk_strategy: size=%d dblk=%d\n", size, dblk); 128 #endif 129 130 dmabuf = dvma_mapin(buf, size); 131 si_flag = (flag == F_READ) ? SAIO_F_READ : SAIO_F_WRITE; 132 133 /* 134 * The PROM strategy will occasionally return -1 and expect 135 * us to try again. From mouse@Collatz.McRCIM.McGill.EDU 136 */ 137 retry = RETRY_COUNT; 138 do { 139 si->si_bn = dblk; 140 si->si_ma = dmabuf; 141 si->si_cc = size; 142 xcnt = (*ops->b_strategy)(si, si_flag); 143 } while ((xcnt <= 0) && (--retry > 0)); 144 145 dvma_mapout(dmabuf, size); 146 147 #ifdef DEBUG_PROM 148 if (debug > 1) 149 printf("disk_strategy: xcnt = %x retries=%d\n", 150 xcnt, RETRY_COUNT - retry); 151 #endif 152 153 if (xcnt <= 0) 154 return (EIO); 155 156 *rsize = xcnt; 157 return (0); 158 } 159 160 int 161 disk_ioctl(struct open_file *f, u_long cmd, void *data) 162 { 163 return EIO; 164 } 165 166