1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2000 Nikolai Saoukh 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 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 32 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 if (resource_disabled("orm", 0)) 95 return; 96 97 child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, "orm", -1); 98 device_set_driver(child, driver); 99 isa_set_logicalid(child, ORM_ID); 100 isa_set_vendorid(child, ORM_ID); 101 sc = device_get_softc(child); 102 sc->rnum = 0; 103 while (sc->rnum < MAX_ROMS && chunk < IOMEM_END) { 104 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 105 IOMEM_STEP); 106 rid = sc->rnum; 107 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 108 RF_ACTIVE); 109 if (res == NULL) { 110 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 111 chunk += IOMEM_STEP; 112 continue; 113 } 114 bt = rman_get_bustag(res); 115 bh = rman_get_bushandle(res); 116 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf)); 117 118 /* 119 * We need to release and delete the resource since we're 120 * changing its size, or the rom isn't there. There 121 * is a checksum field in the ROM to prevent false 122 * positives. However, some common hardware (IBM thinkpads) 123 * neglects to put a valid checksum in the ROM, so we do 124 * not double check the checksum here. On the ISA bus 125 * areas that have no hardware read back as 0xff, so the 126 * tests to see if we have 0x55 followed by 0xaa are 127 * generally sufficient. 128 */ 129 bus_release_resource(child, SYS_RES_MEMORY, rid, res); 130 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 131 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) { 132 chunk += IOMEM_STEP; 133 continue; 134 } 135 rom_size = buf[2] << 9; 136 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 137 rom_size); 138 rid = sc->rnum; 139 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 0); 140 if (res == NULL) { 141 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 142 chunk += IOMEM_STEP; 143 continue; 144 } 145 sc->rid[sc->rnum] = rid; 146 sc->res[sc->rnum] = res; 147 sc->rnum++; 148 chunk += rom_size; 149 } 150 151 if (sc->rnum == 0) 152 device_delete_child(parent, child); 153 else if (sc->rnum == 1) 154 device_set_desc(child, "ISA Option ROM"); 155 else 156 device_set_desc(child, "ISA Option ROMs"); 157 } 158 159 static int 160 orm_detach(device_t dev) 161 { 162 int i; 163 struct orm_softc *sc = device_get_softc(dev); 164 165 for (i = 0; i < sc->rnum; i++) 166 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i], 167 sc->res[i]); 168 return (0); 169 } 170 171 static device_method_t orm_methods[] = { 172 /* Device interface */ 173 DEVMETHOD(device_identify, orm_identify), 174 DEVMETHOD(device_probe, orm_probe), 175 DEVMETHOD(device_attach, orm_attach), 176 DEVMETHOD(device_detach, orm_detach), 177 { 0, 0 } 178 }; 179 180 static driver_t orm_driver = { 181 "orm", 182 orm_methods, 183 sizeof (struct orm_softc) 184 }; 185 186 DRIVER_MODULE(orm, isa, orm_driver, 0, 0); 187 ISA_PNP_INFO(orm_ids); 188