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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 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 <isa/isavar.h> 48 #include <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 void 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 child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, "orm", -1); 95 device_set_driver(child, driver); 96 isa_set_logicalid(child, ORM_ID); 97 isa_set_vendorid(child, ORM_ID); 98 sc = device_get_softc(child); 99 sc->rnum = 0; 100 while (chunk < IOMEM_END) { 101 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 102 IOMEM_STEP); 103 rid = sc->rnum; 104 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 105 RF_ACTIVE); 106 if (res == NULL) { 107 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 108 chunk += IOMEM_STEP; 109 continue; 110 } 111 bt = rman_get_bustag(res); 112 bh = rman_get_bushandle(res); 113 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf)); 114 115 /* 116 * We need to release and delete the resource since we're 117 * changing its size, or the rom isn't there. There 118 * is a checksum field in the ROM to prevent false 119 * positives. However, some common hardware (IBM thinkpads) 120 * neglects to put a valid checksum in the ROM, so we do 121 * not double check the checksum here. On the ISA bus 122 * areas that have no hardware read back as 0xff, so the 123 * tests to see if we have 0x55 followed by 0xaa are 124 * generally sufficient. 125 */ 126 bus_release_resource(child, SYS_RES_MEMORY, rid, res); 127 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 128 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) { 129 chunk += IOMEM_STEP; 130 continue; 131 } 132 rom_size = buf[2] << 9; 133 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 134 rom_size); 135 rid = sc->rnum; 136 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 0); 137 if (res == NULL) { 138 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 139 chunk += IOMEM_STEP; 140 continue; 141 } 142 sc->rid[sc->rnum] = rid; 143 sc->res[sc->rnum] = res; 144 sc->rnum++; 145 chunk += rom_size; 146 } 147 148 if (sc->rnum == 0) 149 device_delete_child(parent, child); 150 else if (sc->rnum == 1) 151 device_set_desc(child, "ISA Option ROM"); 152 else 153 device_set_desc(child, "ISA Option ROMs"); 154 } 155 156 static int 157 orm_detach(device_t dev) 158 { 159 int i; 160 struct orm_softc *sc = device_get_softc(dev); 161 162 for (i = 0; i < sc->rnum; i++) 163 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i], 164 sc->res[i]); 165 return (0); 166 } 167 168 static device_method_t orm_methods[] = { 169 /* Device interface */ 170 DEVMETHOD(device_identify, orm_identify), 171 DEVMETHOD(device_probe, orm_probe), 172 DEVMETHOD(device_attach, orm_attach), 173 DEVMETHOD(device_detach, orm_detach), 174 { 0, 0 } 175 }; 176 177 static driver_t orm_driver = { 178 "orm", 179 orm_methods, 180 sizeof (struct orm_softc) 181 }; 182 183 static devclass_t orm_devclass; 184 185 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, 0, 0); 186