| 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); |
| 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); |
| 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 | { 0, 0 } |
| 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); |