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 1.5 2005/10/30 04:41:15 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 40 #include <sys/module.h> 41 #include <sys/bus.h> 42 43 #include <machine/bus.h> 44 #include <machine/resource.h> 45 #include <sys/rman.h> 46 47 #include <bus/isa/isavar.h> 48 #include <bus/isa/pnpvar.h> 49 50 #define IOMEM_START 0x0a0000 51 #define IOMEM_STEP 0x000800 52 #define IOMEM_END 0x100000 53 54 #define ORM_ID 0x00004d3e 55 56 static struct isa_pnp_id orm_ids[] = { 57 { ORM_ID, NULL }, /* ORM0000 */ 58 { 0, NULL }, 59 }; 60 61 #define MAX_ROMS 16 62 63 struct orm_softc { 64 int rnum; 65 int rid[MAX_ROMS]; 66 struct resource *res[MAX_ROMS]; 67 }; 68 69 static int 70 orm_probe(device_t dev) 71 { 72 return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids)); 73 } 74 75 static int 76 orm_attach(device_t dev) 77 { 78 return (0); 79 } 80 81 static int 82 orm_identify(driver_t* driver, device_t parent) 83 { 84 bus_space_handle_t bh; 85 bus_space_tag_t bt; 86 device_t child; 87 u_int32_t chunk = IOMEM_START; 88 struct resource *res; 89 int rid; 90 u_int32_t rom_size; 91 struct orm_softc *sc; 92 u_int8_t buf[3]; 93 94 /* 95 * rescanning the isa bus, do nothing 96 */ 97 if (device_get_state(parent) == DS_ATTACHED) 98 return (0); 99 100 /* 101 * Otherwise see if it exists 102 */ 103 child = BUS_ADD_CHILD(parent, parent, ISA_ORDER_SENSITIVE, "orm", -1); 104 device_set_driver(child, driver); 105 isa_set_logicalid(child, ORM_ID); 106 isa_set_vendorid(child, ORM_ID); 107 sc = device_get_softc(child); 108 sc->rnum = 0; 109 while (chunk < IOMEM_END) { 110 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 111 IOMEM_STEP); 112 rid = sc->rnum; 113 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul, 114 ~0ul, IOMEM_STEP, RF_ACTIVE); 115 if (res == NULL) { 116 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 117 chunk += IOMEM_STEP; 118 continue; 119 } 120 bt = rman_get_bustag(res); 121 bh = rman_get_bushandle(res); 122 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf)); 123 124 /* 125 * We need to release and delete the resource since we're 126 * changing its size, or the rom isn't there. There 127 * is a checksum field in the ROM to prevent false 128 * positives. However, some common hardware (IBM thinkpads) 129 * neglects to put a valid checksum in the ROM, so we do 130 * not double check the checksum here. On the ISA bus 131 * areas that have no hardware read back as 0xff, so the 132 * tests to see if we have 0x55 followed by 0xaa are 133 * generally sufficient. 134 */ 135 bus_release_resource(child, SYS_RES_MEMORY, rid, res); 136 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 137 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) { 138 chunk += IOMEM_STEP; 139 continue; 140 } 141 rom_size = buf[2] << 9; 142 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 143 rom_size); 144 rid = sc->rnum; 145 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul, 146 ~0ul, rom_size, 0); 147 if (res == NULL) { 148 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 149 chunk += IOMEM_STEP; 150 continue; 151 } 152 sc->rid[sc->rnum] = rid; 153 sc->res[sc->rnum] = res; 154 sc->rnum++; 155 chunk += rom_size; 156 } 157 158 /* 159 * note: sc becomes invalid after we delete the child. 160 */ 161 if (sc->rnum == 0) { 162 device_delete_child(parent, child); 163 return (ENXIO); 164 } 165 if (sc->rnum == 1) 166 device_set_desc(child, "Option ROM"); 167 else 168 device_set_desc(child, "Option ROMs"); 169 return (0); 170 } 171 172 static int 173 orm_detach(device_t dev) 174 { 175 int i; 176 struct orm_softc *sc = device_get_softc(dev); 177 178 for (i = 0; i < sc->rnum; i++) 179 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i], 180 sc->res[i]); 181 return (0); 182 } 183 184 static device_method_t orm_methods[] = { 185 /* Device interface */ 186 DEVMETHOD(device_identify, orm_identify), 187 DEVMETHOD(device_probe, orm_probe), 188 DEVMETHOD(device_attach, orm_attach), 189 DEVMETHOD(device_detach, orm_detach), 190 { 0, 0 } 191 }; 192 193 static driver_t orm_driver = { 194 "orm", 195 orm_methods, 196 sizeof (struct orm_softc) 197 }; 198 199 static devclass_t orm_devclass; 200 201 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, 0, 0); 202