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 */ 28 29 /* 30 * Driver to take care of holes in ISA I/O memory occupied 31 * by option rom(s) 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/socket.h> 38 #include <sys/module.h> 39 #include <sys/bus.h> 40 #include <sys/rman.h> 41 42 #include <bus/isa/isavar.h> 43 #include <bus/isa/pnpvar.h> 44 45 #define IOMEM_START 0x0a0000 46 #define IOMEM_STEP 0x000800 47 #define IOMEM_END 0x100000 48 49 #define ORM_ID 0x00004d3e 50 51 static struct isa_pnp_id orm_ids[] = { 52 { ORM_ID, NULL }, /* ORM0000 */ 53 { 0, NULL }, 54 }; 55 56 #define MAX_ROMS 16 57 58 struct orm_softc { 59 int rnum; 60 int rid[MAX_ROMS]; 61 struct resource *res[MAX_ROMS]; 62 }; 63 64 static int 65 orm_probe(device_t dev) 66 { 67 return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids)); 68 } 69 70 static int 71 orm_attach(device_t dev) 72 { 73 return (0); 74 } 75 76 static int 77 orm_identify(driver_t* driver, device_t parent) 78 { 79 bus_space_handle_t bh; 80 bus_space_tag_t bt; 81 device_t child; 82 u_int32_t chunk = IOMEM_START; 83 struct resource *res; 84 int rid; 85 u_int32_t rom_size; 86 struct orm_softc *sc; 87 u_int8_t buf[3]; 88 89 /* 90 * rescanning the isa bus, do nothing 91 */ 92 if (device_get_state(parent) == DS_ATTACHED) 93 return (0); 94 95 /* 96 * Otherwise see if it exists 97 */ 98 child = BUS_ADD_CHILD(parent, parent, ISA_ORDER_SENSITIVE, "orm", -1); 99 device_set_driver(child, driver); 100 isa_set_logicalid(child, ORM_ID); 101 isa_set_vendorid(child, ORM_ID); 102 sc = device_get_softc(child); 103 sc->rnum = 0; 104 while (chunk < IOMEM_END) { 105 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 106 IOMEM_STEP, -1); 107 rid = sc->rnum; 108 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul, 109 ~0ul, IOMEM_STEP, RF_ACTIVE); 110 if (res == NULL) { 111 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 112 chunk += IOMEM_STEP; 113 continue; 114 } 115 bt = rman_get_bustag(res); 116 bh = rman_get_bushandle(res); 117 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf)); 118 119 /* 120 * We need to release and delete the resource since we're 121 * changing its size, or the rom isn't there. There 122 * is a checksum field in the ROM to prevent false 123 * positives. However, some common hardware (IBM thinkpads) 124 * neglects to put a valid checksum in the ROM, so we do 125 * not double check the checksum here. On the ISA bus 126 * areas that have no hardware read back as 0xff, so the 127 * tests to see if we have 0x55 followed by 0xaa are 128 * generally sufficient. 129 */ 130 bus_release_resource(child, SYS_RES_MEMORY, rid, res); 131 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 132 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) { 133 chunk += IOMEM_STEP; 134 continue; 135 } 136 rom_size = buf[2] << 9; 137 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 138 rom_size, -1); 139 rid = sc->rnum; 140 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul, 141 ~0ul, rom_size, 0); 142 if (res == NULL) { 143 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 144 chunk += IOMEM_STEP; 145 continue; 146 } 147 sc->rid[sc->rnum] = rid; 148 sc->res[sc->rnum] = res; 149 sc->rnum++; 150 chunk += rom_size; 151 } 152 153 /* 154 * note: sc becomes invalid after we delete the child. 155 */ 156 if (sc->rnum == 0) { 157 device_delete_child(parent, child); 158 return (ENXIO); 159 } 160 if (sc->rnum == 1) 161 device_set_desc(child, "Option ROM"); 162 else 163 device_set_desc(child, "Option ROMs"); 164 return (0); 165 } 166 167 static int 168 orm_detach(device_t dev) 169 { 170 int i; 171 struct orm_softc *sc = device_get_softc(dev); 172 173 for (i = 0; i < sc->rnum; i++) 174 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i], 175 sc->res[i]); 176 return (0); 177 } 178 179 static device_method_t orm_methods[] = { 180 /* Device interface */ 181 DEVMETHOD(device_identify, orm_identify), 182 DEVMETHOD(device_probe, orm_probe), 183 DEVMETHOD(device_attach, orm_attach), 184 DEVMETHOD(device_detach, orm_detach), 185 DEVMETHOD_END 186 }; 187 188 static driver_t orm_driver = { 189 "orm", 190 orm_methods, 191 sizeof (struct orm_softc) 192 }; 193 194 static devclass_t orm_devclass; 195 196 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, NULL, NULL); 197