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 * $FreeBSD$ 26 * 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bio.h> 32 #include <sys/bus.h> 33 #include <sys/conf.h> 34 #include <sys/disk.h> 35 #include <sys/kernel.h> 36 37 #include <dev/ofw/openfirm.h> 38 39 #include <machine/bus.h> 40 #include <machine/md_var.h> 41 #include <machine/nexusvar.h> 42 43 #define OFWD_BLOCKSIZE 512 44 45 struct ofwd_softc 46 { 47 device_t ofwd_dev; 48 dev_t ofwd_dev_t; 49 struct disk ofwd_disk; 50 phandle_t ofwd_package; 51 ihandle_t ofwd_instance; 52 u_int ofwd_flags; 53 #define OFWD_OPEN (1<<0) 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 d_open_t ofwd_open; 84 static d_close_t ofwd_close; 85 static d_strategy_t ofwd_strategy; 86 87 #define OFWD_CDEV_MAJOR 169 88 89 static struct cdevsw ofwd_cdevsw = { 90 ofwd_open, 91 ofwd_close, 92 physread, 93 physwrite, 94 noioctl, 95 nopoll, 96 nommap, 97 ofwd_strategy, 98 "ofwd", 99 OFWD_CDEV_MAJOR, 100 nodump, 101 nopsize, 102 D_DISK 103 }; 104 105 static struct cdevsw ofwddisk_cdevsw; 106 107 /* 108 * Handle open from generic layer. 109 * 110 * This is typically only called by the diskslice code and not for opens on 111 * subdevices. 112 */ 113 static int 114 ofwd_open(dev_t dev, int flags, int fmt, struct thread *td) 115 { 116 struct ofwd_softc *sc; 117 struct disklabel *label; 118 119 sc = (struct ofwd_softc *)dev->si_drv1; 120 if (sc == NULL) 121 return (ENXIO); 122 123 /* 124 * Build synthetic label. 125 */ 126 label = &sc->ofwd_disk.d_label; 127 bzero(label, sizeof(*label)); 128 label->d_type = DTYPE_ESDI; 129 label->d_secsize = OFWD_BLOCKSIZE; 130 label->d_nsectors = 33554432; 131 label->d_ntracks = 1; 132 label->d_ncylinders = 1024; 133 label->d_secpercyl = 32768; 134 label->d_secperunit = 33554432; 135 136 sc->ofwd_flags |= OFWD_OPEN; 137 return (0); 138 } 139 140 /* 141 * Handle last close of the disk device. 142 */ 143 static int 144 ofwd_close(dev_t dev, int flags, int fmt, struct thread *td) 145 { 146 struct ofwd_softc *sc; 147 148 sc = (struct ofwd_softc *)dev->si_drv1; 149 150 if (sc == NULL) 151 return (ENXIO); 152 153 sc->ofwd_flags &= ~OFWD_OPEN; 154 155 return (0); 156 } 157 158 /* 159 * Handle an I/O request. 160 */ 161 static void 162 ofwd_strategy(struct bio *bp) 163 { 164 struct ofwd_softc *sc; 165 long r; 166 167 sc = (struct ofwd_softc *)bp->bio_dev->si_drv1; 168 169 if (sc == NULL) { 170 bp->bio_error = EINVAL; 171 bp->bio_flags |= BIO_ERROR; 172 printf("ofwd: bio for invalid disk!\n"); 173 biodone(bp); 174 return; 175 } 176 177 r = OF_seek(sc->ofwd_instance, 178 (u_quad_t)(bp->bio_blkno * OFWD_BLOCKSIZE)); 179 if (r == -1) { 180 bp->bio_resid = bp->bio_bcount; 181 bp->bio_error = EIO; 182 bp->bio_flags |= BIO_ERROR; 183 device_printf(sc->ofwd_dev, "seek failed\n"); 184 biodone(bp); 185 return; 186 } 187 188 if (bp->bio_cmd == BIO_READ) { 189 r = OF_read(sc->ofwd_instance, (void *)bp->bio_data, 190 bp->bio_bcount); 191 } else { 192 r = OF_write(sc->ofwd_instance, (void *)bp->bio_data, 193 bp->bio_bcount); 194 } 195 196 if (r < bp->bio_bcount) { 197 device_printf(sc->ofwd_dev, "r (%ld) < bp->bio_bcount (%ld)\n", 198 r, bp->bio_bcount); 199 if (r != -1) 200 bp->bio_resid = bp->bio_bcount - r; 201 bp->bio_error = EIO; 202 bp->bio_flags |= BIO_ERROR; 203 } else if (r > bp->bio_bcount) 204 panic("ofwd: more bytes read/written than requested"); 205 206 bp->bio_resid -= r; 207 biodone(bp); 208 209 return; 210 } 211 212 /* 213 * Probe for an OpenFirmware disk. 214 */ 215 static int 216 ofwd_probe(device_t dev) 217 { 218 char *type; 219 220 type = nexus_get_device_type(dev); 221 222 if (type == NULL || strcmp(type, "disk") != 0) 223 return (ENXIO); 224 225 device_set_desc(dev, "OpenFirmware disk"); 226 return (0); 227 } 228 229 static int 230 ofwd_attach(device_t dev) 231 { 232 struct ofwd_softc *sc; 233 char path[128]; 234 dev_t dsk; 235 236 sc = device_get_softc(dev); 237 sc->ofwd_dev = dev; 238 239 bzero(path, 128); 240 OF_package_to_path(nexus_get_node(dev), path, 128); 241 device_printf(dev, "located at %s\n", path); 242 sc->ofwd_instance = OF_open(path); 243 if (sc->ofwd_instance == -1) { 244 device_printf(dev, "could not create instance\n"); 245 return (ENXIO); 246 } 247 248 dsk = disk_create(device_get_unit(dev), &sc->ofwd_disk, 0, 249 &ofwd_cdevsw, &ofwddisk_cdevsw); 250 dsk->si_drv1 = sc; 251 sc->ofwd_dev_t = dsk; 252 253 dsk->si_iosize_max = PAGE_SIZE; 254 255 return (0); 256 } 257 258 static void 259 ofwd_identify(driver_t *driver, device_t parent) 260 { 261 } 262