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 struct disk ofwd_disk; 49 phandle_t ofwd_package; 50 ihandle_t ofwd_instance; 51 }; 52 53 /* 54 * Disk device bus interface. 55 */ 56 static void ofwd_identify(driver_t *, device_t); 57 static int ofwd_probe(device_t); 58 static int ofwd_attach(device_t); 59 60 static device_method_t ofwd_methods[] = { 61 DEVMETHOD(device_identify, ofwd_identify), 62 DEVMETHOD(device_probe, ofwd_probe), 63 DEVMETHOD(device_attach, ofwd_attach), 64 { 0, 0 } 65 }; 66 67 static driver_t ofwd_driver = { 68 "ofwd", 69 ofwd_methods, 70 sizeof(struct ofwd_softc) 71 }; 72 73 static devclass_t ofwd_devclass; 74 75 DRIVER_MODULE(ofwd, nexus, ofwd_driver, ofwd_devclass, 0, 0); 76 77 /* 78 * Disk device control interface. 79 */ 80 static disk_strategy_t ofwd_strategy; 81 82 /* 83 * Handle an I/O request. 84 */ 85 static void 86 ofwd_strategy(struct bio *bp) 87 { 88 struct ofwd_softc *sc; 89 long r; 90 91 sc = (struct ofwd_softc *)bp->bio_disk->d_drv1; 92 93 if (sc == NULL) { 94 printf("ofwd: bio for invalid disk!\n"); 95 biofinish(bp, NULL, EINVAL); 96 return; 97 } 98 99 r = OF_seek(sc->ofwd_instance, 100 (u_quad_t)(bp->bio_blkno * OFWD_BLOCKSIZE)); 101 if (r == -1) { 102 bp->bio_resid = bp->bio_bcount; 103 device_printf(sc->ofwd_dev, "seek failed\n"); 104 biofinish(bp, NULL, EIO); 105 return; 106 } 107 108 if (bp->bio_cmd == BIO_READ) { 109 r = OF_read(sc->ofwd_instance, (void *)bp->bio_data, 110 bp->bio_bcount); 111 } else { 112 r = OF_write(sc->ofwd_instance, (void *)bp->bio_data, 113 bp->bio_bcount); 114 } 115 116 if (r > bp->bio_bcount) 117 panic("ofwd: more bytes read/written than requested"); 118 if (r == -1) { 119 device_printf(sc->ofwd_dev, "r (%ld) < bp->bio_bcount (%ld)\n", 120 r, bp->bio_bcount); 121 biofinish(bp, NULL, EIO); 122 return; 123 } 124 125 bp->bio_resid -= r; 126 127 if (r < bp->bio_bcount) { 128 device_printf(sc->ofwd_dev, "r (%ld) < bp->bio_bcount (%ld)\n", 129 r, bp->bio_bcount); 130 biofinish(bp, NULL, EIO); /* XXX: probably not an error */ 131 return; 132 } 133 biodone(bp); 134 return; 135 } 136 137 /* 138 * Probe for an OpenFirmware disk. 139 */ 140 static int 141 ofwd_probe(device_t dev) 142 { 143 char *type; 144 145 type = nexus_get_device_type(dev); 146 147 if (type == NULL || strcmp(type, "disk") != 0) 148 return (ENXIO); 149 150 device_set_desc(dev, "OpenFirmware disk"); 151 return (0); 152 } 153 154 static int 155 ofwd_attach(device_t dev) 156 { 157 struct ofwd_softc *sc; 158 char path[128]; 159 dev_t dsk; 160 161 sc = device_get_softc(dev); 162 sc->ofwd_dev = dev; 163 164 bzero(path, 128); 165 OF_package_to_path(nexus_get_node(dev), path, 128); 166 device_printf(dev, "located at %s\n", path); 167 sc->ofwd_instance = OF_open(path); 168 if (sc->ofwd_instance == -1) { 169 device_printf(dev, "could not create instance\n"); 170 return (ENXIO); 171 } 172 173 sc->ofwd_disk.d_strategy = ofwd_strategy; 174 sc->ofwd_disk.d_name = "ofwd"; 175 sc->ofwd_disk.d_sectorsize = OFWD_BLOCKSIZE; 176 sc->ofwd_disk.d_mediasize = (off_t)33554432 * OFWD_BLOCKSIZE; 177 sc->ofwd_disk.d_fwsectors = 0; 178 sc->ofwd_disk.d_fwheads = 0; 179 sc->ofwd_disk.d_drv1 = sc; 180 sc->ofwd_disk.d_maxsize = PAGE_SIZE; 181 disk_create(device_get_unit(dev), &sc->ofwd_disk, 0, NULL, NULL); 182 183 return (0); 184 } 185 186 static void 187 ofwd_identify(driver_t *driver, device_t parent) 188 { 189 } 190