1 /*- 2 * Copyright (c) 2000 Nikolai Saoukh 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 THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/isa/orm.c,v 1.1.2.1 2001/06/19 05:48:29 imp Exp $ 27 * $DragonFly: src/sys/dev/misc/orm/orm.c,v 1.6 2006/10/25 20:55:54 dillon Exp $ 28 */ 29 30 /* 31 * Driver to take care of holes in ISA I/O memory occupied 32 * by option rom(s) 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/socket.h> 39 #include <sys/module.h> 40 #include <sys/bus.h> 41 #include <sys/rman.h> 42 43 #include <bus/isa/isavar.h> 44 #include <bus/isa/pnpvar.h> 45 46 #define IOMEM_START 0x0a0000 47 #define IOMEM_STEP 0x000800 48 #define IOMEM_END 0x100000 49 50 #define ORM_ID 0x00004d3e 51 52 static struct isa_pnp_id orm_ids[] = { 53 { ORM_ID, NULL }, /* ORM0000 */ 54 { 0, NULL }, 55 }; 56 57 #define MAX_ROMS 16 58 59 struct orm_softc { 60 int rnum; 61 int rid[MAX_ROMS]; 62 struct resource *res[MAX_ROMS]; 63 }; 64 65 static int 66 orm_probe(device_t dev) 67 { 68 return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids)); 69 } 70 71 static int 72 orm_attach(device_t dev) 73 { 74 return (0); 75 } 76 77 static int 78 orm_identify(driver_t* driver, device_t parent) 79 { 80 bus_space_handle_t bh; 81 bus_space_tag_t bt; 82 device_t child; 83 u_int32_t chunk = IOMEM_START; 84 struct resource *res; 85 int rid; 86 u_int32_t rom_size; 87 struct orm_softc *sc; 88 u_int8_t buf[3]; 89 90 /* 91 * rescanning the isa bus, do nothing 92 */ 93 if (device_get_state(parent) == DS_ATTACHED) 94 return (0); 95 96 /* 97 * Otherwise see if it exists 98 */ 99 child = BUS_ADD_CHILD(parent, parent, ISA_ORDER_SENSITIVE, "orm", -1); 100 device_set_driver(child, driver); 101 isa_set_logicalid(child, ORM_ID); 102 isa_set_vendorid(child, ORM_ID); 103 sc = device_get_softc(child); 104 sc->rnum = 0; 105 while (chunk < IOMEM_END) { 106 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 107 IOMEM_STEP); 108 rid = sc->rnum; 109 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul, 110 ~0ul, IOMEM_STEP, RF_ACTIVE); 111 if (res == NULL) { 112 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 113 chunk += IOMEM_STEP; 114 continue; 115 } 116 bt = rman_get_bustag(res); 117 bh = rman_get_bushandle(res); 118 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf)); 119 120 /* 121 * We need to release and delete the resource since we're 122 * changing its size, or the rom isn't there. There 123 * is a checksum field in the ROM to prevent false 124 * positives. However, some common hardware (IBM thinkpads) 125 * neglects to put a valid checksum in the ROM, so we do 126 * not double check the checksum here. On the ISA bus 127 * areas that have no hardware read back as 0xff, so the 128 * tests to see if we have 0x55 followed by 0xaa are 129 * generally sufficient. 130 */ 131 bus_release_resource(child, SYS_RES_MEMORY, rid, res); 132 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 133 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) { 134 chunk += IOMEM_STEP; 135 continue; 136 } 137 rom_size = buf[2] << 9; 138 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 139 rom_size); 140 rid = sc->rnum; 141 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul, 142 ~0ul, rom_size, 0); 143 if (res == NULL) { 144 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 145 chunk += IOMEM_STEP; 146 continue; 147 } 148 sc->rid[sc->rnum] = rid; 149 sc->res[sc->rnum] = res; 150 sc->rnum++; 151 chunk += rom_size; 152 } 153 154 /* 155 * note: sc becomes invalid after we delete the child. 156 */ 157 if (sc->rnum == 0) { 158 device_delete_child(parent, child); 159 return (ENXIO); 160 } 161 if (sc->rnum == 1) 162 device_set_desc(child, "Option ROM"); 163 else 164 device_set_desc(child, "Option ROMs"); 165 return (0); 166 } 167 168 static int 169 orm_detach(device_t dev) 170 { 171 int i; 172 struct orm_softc *sc = device_get_softc(dev); 173 174 for (i = 0; i < sc->rnum; i++) 175 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i], 176 sc->res[i]); 177 return (0); 178 } 179 180 static device_method_t orm_methods[] = { 181 /* Device interface */ 182 DEVMETHOD(device_identify, orm_identify), 183 DEVMETHOD(device_probe, orm_probe), 184 DEVMETHOD(device_attach, orm_attach), 185 DEVMETHOD(device_detach, orm_detach), 186 { 0, 0 } 187 }; 188 189 static driver_t orm_driver = { 190 "orm", 191 orm_methods, 192 sizeof (struct orm_softc) 193 }; 194 195 static devclass_t orm_devclass; 196 197 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, 0, 0); 198