1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 __FBSDID("$FreeBSD$"); 31 32 /* 33 * Driver to take care of holes in ISA I/O memory occupied 34 * by option rom(s) 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/socket.h> 41 42 #include <sys/module.h> 43 #include <sys/bus.h> 44 45 #include <machine/bus.h> 46 #include <machine/resource.h> 47 #include <sys/rman.h> 48 49 #include <isa/isavar.h> 50 #include <isa/pnpvar.h> 51 52 #define IOMEM_START 0x0a0000 53 #define IOMEM_STEP 0x000800 54 #define IOMEM_END 0x100000 55 56 #define ORM_ID 0x00004d3e 57 58 static struct isa_pnp_id orm_ids[] = { 59 { ORM_ID, NULL }, /* ORM0000 */ 60 { 0, NULL }, 61 }; 62 63 #define MAX_ROMS 32 64 65 struct orm_softc { 66 int rnum; 67 int rid[MAX_ROMS]; 68 struct resource *res[MAX_ROMS]; 69 }; 70 71 static int 72 orm_probe(device_t dev) 73 { 74 return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids)); 75 } 76 77 static int 78 orm_attach(device_t dev) 79 { 80 return (0); 81 } 82 83 static void 84 orm_identify(driver_t* driver, device_t parent) 85 { 86 bus_space_handle_t bh; 87 bus_space_tag_t bt; 88 device_t child; 89 u_int32_t chunk = IOMEM_START; 90 struct resource *res; 91 int rid; 92 u_int32_t rom_size; 93 struct orm_softc *sc; 94 u_int8_t buf[3]; 95 96 if (resource_disabled("orm", 0)) 97 return; 98 99 child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, "orm", -1); 100 device_set_driver(child, driver); 101 isa_set_logicalid(child, ORM_ID); 102 isa_set_vendorid(child, ORM_ID); 103 sc = device_get_softc(child); 104 sc->rnum = 0; 105 while (sc->rnum < MAX_ROMS && chunk < IOMEM_END) { 106 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 107 IOMEM_STEP); 108 rid = sc->rnum; 109 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 110 RF_ACTIVE); 111 if (res == NULL) { 112 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 113 chunk += IOMEM_STEP; 114 continue; 115 } 116 bt = rman_get_bustag(res); 117 bh = rman_get_bushandle(res); 118 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf)); 119 120 /* 121 * We need to release and delete the resource since we're 122 * changing its size, or the rom isn't there. There 123 * is a checksum field in the ROM to prevent false 124 * positives. However, some common hardware (IBM thinkpads) 125 * neglects to put a valid checksum in the ROM, so we do 126 * not double check the checksum here. On the ISA bus 127 * areas that have no hardware read back as 0xff, so the 128 * tests to see if we have 0x55 followed by 0xaa are 129 * generally sufficient. 130 */ 131 bus_release_resource(child, SYS_RES_MEMORY, rid, res); 132 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum); 133 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) { 134 chunk += IOMEM_STEP; 135 continue; 136 } 137 rom_size = buf[2] << 9; 138 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk, 139 rom_size); 140 rid = sc->rnum; 141 res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 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 if (sc->rnum == 0) 154 device_delete_child(parent, child); 155 else if (sc->rnum == 1) 156 device_set_desc(child, "ISA Option ROM"); 157 else 158 device_set_desc(child, "ISA Option ROMs"); 159 } 160 161 static int 162 orm_detach(device_t dev) 163 { 164 int i; 165 struct orm_softc *sc = device_get_softc(dev); 166 167 for (i = 0; i < sc->rnum; i++) 168 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i], 169 sc->res[i]); 170 return (0); 171 } 172 173 static device_method_t orm_methods[] = { 174 /* Device interface */ 175 DEVMETHOD(device_identify, orm_identify), 176 DEVMETHOD(device_probe, orm_probe), 177 DEVMETHOD(device_attach, orm_attach), 178 DEVMETHOD(device_detach, orm_detach), 179 { 0, 0 } 180 }; 181 182 static driver_t orm_driver = { 183 "orm", 184 orm_methods, 185 sizeof (struct orm_softc) 186 }; 187 188 static devclass_t orm_devclass; 189 190 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, 0, 0); 191 ISA_PNP_INFO(orm_ids); 192