1 /* 2 * Copyright (C) 2002 Benno Rice <benno@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bio.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/kernel.h> 37 #include <sys/limits.h> 38 #include <geom/geom_disk.h> 39 40 #include <dev/ofw/openfirm.h> 41 42 #include <machine/bus.h> 43 #include <machine/md_var.h> 44 #include <machine/nexusvar.h> 45 46 #define OFWD_BLOCKSIZE 512 47 48 struct ofwd_softc 49 { 50 device_t ofwd_dev; 51 struct disk *ofwd_disk; 52 phandle_t ofwd_package; 53 ihandle_t ofwd_instance; 54 }; 55 56 /* 57 * Disk device bus interface. 58 */ 59 static void ofwd_identify(driver_t *, device_t); 60 static int ofwd_probe(device_t); 61 static int ofwd_attach(device_t); 62 63 static device_method_t ofwd_methods[] = { 64 DEVMETHOD(device_identify, ofwd_identify), 65 DEVMETHOD(device_probe, ofwd_probe), 66 DEVMETHOD(device_attach, ofwd_attach), 67 { 0, 0 } 68 }; 69 70 static driver_t ofwd_driver = { 71 "ofwd", 72 ofwd_methods, 73 sizeof(struct ofwd_softc) 74 }; 75 76 static devclass_t ofwd_devclass; 77 78 DRIVER_MODULE(ofwd, nexus, ofwd_driver, ofwd_devclass, 0, 0); 79 80 /* 81 * Disk device control interface. 82 */ 83 static disk_strategy_t ofwd_strategy; 84 85 /* 86 * Handle an I/O request. 87 */ 88 static void 89 ofwd_strategy(struct bio *bp) 90 { 91 struct ofwd_softc *sc; 92 long r; 93 94 sc = (struct ofwd_softc *)bp->bio_disk->d_drv1; 95 96 if (sc == NULL) { 97 printf("ofwd: bio for invalid disk!\n"); 98 biofinish(bp, NULL, EINVAL); 99 return; 100 } 101 102 r = OF_seek(sc->ofwd_instance, bp->bio_offset); 103 if (r == -1) { 104 bp->bio_resid = bp->bio_bcount; 105 device_printf(sc->ofwd_dev, "seek failed\n"); 106 biofinish(bp, NULL, EIO); 107 return; 108 } 109 110 if (bp->bio_cmd == BIO_READ) { 111 r = OF_read(sc->ofwd_instance, (void *)bp->bio_data, 112 bp->bio_bcount); 113 } else { 114 r = OF_write(sc->ofwd_instance, (void *)bp->bio_data, 115 bp->bio_bcount); 116 } 117 118 if (r > bp->bio_bcount) 119 panic("ofwd: more bytes read/written than requested"); 120 if (r == -1) { 121 device_printf(sc->ofwd_dev, "r (%ld) < bp->bio_bcount (%ld)\n", 122 r, bp->bio_bcount); 123 biofinish(bp, NULL, EIO); 124 return; 125 } 126 127 bp->bio_resid -= r; 128 129 if (r < bp->bio_bcount) { 130 device_printf(sc->ofwd_dev, "r (%ld) < bp->bio_bcount (%ld)\n", 131 r, bp->bio_bcount); 132 biofinish(bp, NULL, EIO); /* XXX: probably not an error */ 133 return; 134 } 135 biodone(bp); 136 return; 137 } 138 139 /* 140 * Attach the OpenFirmware disk to nexus if present 141 */ 142 static void 143 ofwd_identify(driver_t *driver, device_t parent) 144 { 145 device_t child; 146 phandle_t ofd; 147 static char type[8]; 148 149 ofd = OF_finddevice("ofwdisk"); 150 if (ofd == -1) 151 return; 152 153 OF_getprop(ofd, "device_type", type, sizeof(type)); 154 155 child = BUS_ADD_CHILD(parent, INT_MAX, "ofwd", 0); 156 if (child != NULL) { 157 nexus_set_device_type(child, type); 158 nexus_set_node(child, ofd); 159 } 160 } 161 162 /* 163 * Probe for an OpenFirmware disk. 164 */ 165 static int 166 ofwd_probe(device_t dev) 167 { 168 char *type; 169 char fname[32]; 170 phandle_t node; 171 172 type = nexus_get_device_type(dev); 173 node = nexus_get_node(dev); 174 175 if (type == NULL || 176 (strcmp(type, "disk") != 0 && strcmp(type, "block") != 0)) 177 return (ENXIO); 178 179 if (OF_getprop(node, "file", fname, sizeof(fname)) == -1) 180 return (ENXIO); 181 182 device_set_desc(dev, "OpenFirmware disk"); 183 return (0); 184 } 185 186 static int 187 ofwd_attach(device_t dev) 188 { 189 struct ofwd_softc *sc; 190 char path[128]; 191 char fname[32]; 192 193 sc = device_get_softc(dev); 194 sc->ofwd_dev = dev; 195 196 bzero(path, 128); 197 OF_package_to_path(nexus_get_node(dev), path, 128); 198 OF_getprop(nexus_get_node(dev), "file", fname, sizeof(fname)); 199 device_printf(dev, "located at %s, file %s\n", path, fname); 200 sc->ofwd_instance = OF_open(path); 201 if (sc->ofwd_instance == -1) { 202 device_printf(dev, "could not create instance\n"); 203 return (ENXIO); 204 } 205 206 sc->ofwd_disk = disk_alloc(); 207 sc->ofwd_disk->d_strategy = ofwd_strategy; 208 sc->ofwd_disk->d_name = "ofwd"; 209 sc->ofwd_disk->d_sectorsize = OFWD_BLOCKSIZE; 210 sc->ofwd_disk->d_mediasize = (off_t)33554432 * OFWD_BLOCKSIZE; 211 sc->ofwd_disk->d_fwsectors = 0; 212 sc->ofwd_disk->d_fwheads = 0; 213 sc->ofwd_disk->d_drv1 = sc; 214 sc->ofwd_disk->d_maxsize = PAGE_SIZE; 215 sc->ofwd_disk->d_unit = device_get_unit(dev); 216 sc->ofwd_disk->d_flags = DISKFLAG_NEEDSGIANT; 217 disk_create(sc->ofwd_disk, DISK_VERSION); 218 219 return (0); 220 } 221