1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * All rights reserved. 4 * 5 * Copyright (c) 2016 Netflix, Inc. 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 * PnP enumerator using the PCI BIOS. 32 */ 33 34 #include <stand.h> 35 #include <machine/stdarg.h> 36 #include <bootstrap.h> 37 #include <isapnp.h> 38 #include <btxv86.h> 39 #include "libi386.h" 40 41 /* 42 * Stupid PCI BIOS interface doesn't let you simply enumerate everything 43 * that's there, instead you have to ask it if it has something. 44 * 45 * So we have to scan by class code, subclass code and sometimes programming 46 * interface. 47 */ 48 49 struct pci_progif 50 { 51 int pi_code; 52 const char *pi_name; 53 }; 54 55 static struct pci_progif progif_null[] = { 56 {0x0, NULL}, 57 {-1, NULL} 58 }; 59 60 static struct pci_progif progif_display[] = { 61 {0x0, "VGA"}, 62 {0x1, "8514"}, 63 {-1, NULL} 64 }; 65 66 static struct pci_progif progif_ide[] = { 67 {0x00, NULL}, 68 {0x01, NULL}, 69 {0x02, NULL}, 70 {0x03, NULL}, 71 {0x04, NULL}, 72 {0x05, NULL}, 73 {0x06, NULL}, 74 {0x07, NULL}, 75 {0x08, NULL}, 76 {0x09, NULL}, 77 {0x0a, NULL}, 78 {0x0b, NULL}, 79 {0x0c, NULL}, 80 {0x0d, NULL}, 81 {0x0e, NULL}, 82 {0x0f, NULL}, 83 {0x80, NULL}, 84 {0x81, NULL}, 85 {0x82, NULL}, 86 {0x83, NULL}, 87 {0x84, NULL}, 88 {0x85, NULL}, 89 {0x86, NULL}, 90 {0x87, NULL}, 91 {0x88, NULL}, 92 {0x89, NULL}, 93 {0x8a, NULL}, 94 {0x8b, NULL}, 95 {0x8c, NULL}, 96 {0x8d, NULL}, 97 {0x8e, NULL}, 98 {0x8f, NULL}, 99 {-1, NULL} 100 }; 101 102 static struct pci_progif progif_serial[] = { 103 {0x0, "8250"}, 104 {0x1, "16450"}, 105 {0x2, "16550"}, 106 {-1, NULL} 107 }; 108 109 static struct pci_progif progif_parallel[] = { 110 {0x0, "Standard"}, 111 {0x1, "Bidirectional"}, 112 {0x2, "ECP"}, 113 {-1, NULL} 114 }; 115 116 static struct pci_progif progif_firewire[] = { 117 {0x10, "OHCI"}, 118 {-1, NULL} 119 }; 120 121 struct pci_subclass 122 { 123 int ps_subclass; 124 const char *ps_name; 125 struct pci_progif *ps_progif; /* if set, use for programming interface value(s) */ 126 }; 127 128 static struct pci_subclass subclass_old[] = { 129 {0x0, "Old non-VGA", progif_null}, 130 {0x1, "Old VGA", progif_null}, 131 {-1, NULL, NULL} 132 }; 133 134 static struct pci_subclass subclass_mass[] = { 135 {0x0, "SCSI", progif_null}, 136 {0x1, "IDE", progif_ide}, 137 {0x2, "Floppy disk", progif_null}, 138 {0x3, "IPI", progif_null}, 139 {0x4, "RAID", progif_null}, 140 {0x80, "mass storage", progif_null}, 141 {-1, NULL, NULL} 142 }; 143 144 static struct pci_subclass subclass_net[] = { 145 {0x0, "Ethernet", progif_null}, 146 {0x1, "Token ring", progif_null}, 147 {0x2, "FDDI", progif_null}, 148 {0x3, "ATM", progif_null}, 149 {0x80, "network", progif_null}, 150 {-1, NULL, NULL} 151 }; 152 153 static struct pci_subclass subclass_display[] = { 154 {0x0, NULL, progif_display}, 155 {0x1, "XGA", progif_null}, 156 {0x80, "other", progif_null}, 157 {-1, NULL, NULL} 158 }; 159 160 static struct pci_subclass subclass_comms[] = { 161 {0x0, "serial", progif_serial}, 162 {0x1, "parallel", progif_parallel}, 163 {0x80, "communications", progif_null}, 164 {-1, NULL, NULL} 165 }; 166 167 static struct pci_subclass subclass_serial[] = { 168 {0x0, "FireWire", progif_firewire}, 169 {0x1, "ACCESS.bus", progif_null}, 170 {0x2, "SSA", progif_null}, 171 {0x3, "USB", progif_null}, 172 {0x4, "Fibrechannel", progif_null}, 173 {-1, NULL, NULL} 174 }; 175 176 static struct pci_class 177 { 178 int pc_class; 179 const char *pc_name; 180 struct pci_subclass *pc_subclass; 181 } pci_classes[] = { 182 {0x0, "device", subclass_old}, 183 {0x1, "controller", subclass_mass}, 184 {0x2, "controller", subclass_net}, 185 {0x3, "display", subclass_display}, 186 {0x7, "controller", subclass_comms}, 187 {0xc, "controller", subclass_serial}, 188 {-1, NULL, NULL} 189 }; 190 191 static void biospci_enumerate(void); 192 static void biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi); 193 194 struct pnphandler biospcihandler = 195 { 196 "PCI BIOS", 197 biospci_enumerate 198 }; 199 static int biospci_version; 200 201 #define PCI_BIOS_PRESENT 0xb101 202 #define FIND_PCI_DEVICE 0xb102 203 #define FIND_PCI_CLASS_CODE 0xb103 204 #define GENERATE_SPECIAL_CYCLE 0xb106 205 #define READ_CONFIG_BYTE 0xb108 206 #define READ_CONFIG_WORD 0xb109 207 #define READ_CONFIG_DWORD 0xb10a 208 #define WRITE_CONFIG_BYTE 0xb10b 209 #define WRITE_CONFIG_WORD 0xb10c 210 #define WRITE_CONFIG_DWORD 0xb10d 211 #define GET_IRQ_ROUTING_OPTIONS 0xb10e 212 #define SET_PCI_IRQ 0xb10f 213 214 #define PCI_INT 0x1a 215 216 #define PCI_SIGNATURE 0x20494350 /* AKA "PCI " */ 217 218 void 219 biospci_detect(void) 220 { 221 uint16_t version, hwcap, maxbus; 222 char buf[24]; 223 224 /* Find the PCI BIOS */ 225 v86.ctl = V86_FLAGS; 226 v86.addr = PCI_INT; 227 v86.eax = PCI_BIOS_PRESENT; 228 v86.edi = 0x0; 229 v86int(); 230 231 /* Check for OK response */ 232 if (V86_CY(v86.efl) || ((v86.eax & 0xff00) != 0) || 233 (v86.edx != PCI_SIGNATURE)) 234 return; 235 236 version = v86.ebx & 0xffff; 237 hwcap = v86.eax & 0xff; 238 maxbus = v86.ecx & 0xff; 239 #if 0 240 printf("PCI BIOS %d.%d%s%s maxbus %d\n", 241 bcd2bin((version >> 8) & 0xf), bcd2bin(version & 0xf), 242 (hwcap & 1) ? " config1" : "", (hwcap & 2) ? " config2" : "", 243 maxbus); 244 #endif 245 sprintf(buf, "%d", bcd2bin((version >> 8) & 0xf)); 246 setenv("pcibios.major", buf, 1); 247 sprintf(buf, "%d", bcd2bin(version & 0xf)); 248 setenv("pcibios.minor", buf, 1); 249 sprintf(buf, "%d", !!(hwcap & 1)); 250 setenv("pcibios.config1", buf, 1); 251 sprintf(buf, "%d", !!(hwcap & 2)); 252 setenv("pcibios.config2", buf, 1); 253 sprintf(buf, "%d", maxbus); 254 setenv("pcibios.maxbus", buf, 1); 255 biospci_version = bcd2bin((version >> 8) & 0xf) * 10 + bcd2bin(version & 0xf); 256 } 257 258 static void 259 biospci_enumerate(void) 260 { 261 int device_index, err; 262 uint32_t locator, devid; 263 struct pci_class *pc; 264 struct pci_subclass *psc; 265 struct pci_progif *ppi; 266 267 /* Iterate over known classes */ 268 for (pc = pci_classes; pc->pc_class >= 0; pc++) { 269 /* Iterate over subclasses */ 270 for (psc = pc->pc_subclass; psc->ps_subclass >= 0; psc++) { 271 /* Iterate over programming interfaces */ 272 for (ppi = psc->ps_progif; ppi->pi_code >= 0; ppi++) { 273 274 /* Scan for matches */ 275 for (device_index = 0; ; device_index++) { 276 /* Look for a match */ 277 err = biospci_find_devclass((pc->pc_class << 16) 278 + (psc->ps_subclass << 8) + ppi->pi_code, 279 device_index, &locator); 280 if (err != 0) 281 break; 282 283 /* Read the device identifier from the nominated device */ 284 err = biospci_read_config(locator, 0, BIOSPCI_32BITS, &devid); 285 if (err != 0) 286 break; 287 288 /* We have the device ID, create a PnP object and save everything */ 289 biospci_addinfo(devid, pc, psc, ppi); 290 } 291 } 292 } 293 } 294 } 295 296 static void 297 biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi) 298 { 299 struct pnpinfo *pi; 300 char desc[80]; 301 302 303 /* build the description */ 304 desc[0] = 0; 305 if (ppi->pi_name != NULL) { 306 strcat(desc, ppi->pi_name); 307 strcat(desc, " "); 308 } 309 if (psc->ps_name != NULL) { 310 strcat(desc, psc->ps_name); 311 strcat(desc, " "); 312 } 313 if (pc->pc_name != NULL) 314 strcat(desc, pc->pc_name); 315 316 pi = pnp_allocinfo(); 317 pi->pi_desc = strdup(desc); 318 sprintf(desc,"0x%08x", devid); 319 pnp_addident(pi, desc); 320 pnp_addinfo(pi); 321 } 322 323 int 324 biospci_find_devclass(uint32_t class, int index, uint32_t *locator) 325 { 326 v86.ctl = V86_FLAGS; 327 v86.addr = PCI_INT; 328 v86.eax = FIND_PCI_CLASS_CODE; 329 v86.ecx = class; 330 v86.esi = index; 331 v86int(); 332 333 /* error */ 334 if (V86_CY(v86.efl) || (v86.eax & 0xff00)) 335 return (-1); 336 337 *locator = v86.ebx; 338 return (0); 339 } 340 341 static int 342 biospci_find_device(uint32_t devid, int index, uint32_t *locator) 343 { 344 v86.ctl = V86_FLAGS; 345 v86.addr = PCI_INT; 346 v86.eax = FIND_PCI_DEVICE; 347 v86.edx = devid & 0xffff; /* EDX - Vendor ID */ 348 v86.ecx = (devid >> 16) & 0xffff; /* ECX - Device ID */ 349 v86.esi = index; 350 v86int(); 351 352 /* error */ 353 if (V86_CY(v86.efl) || (v86.eax & 0xff00)) 354 return (-1); 355 356 *locator = v86.ebx; 357 return (0); 358 } 359 /* 360 * Configuration space access methods. 361 * width = 0(byte), 1(word) or 2(dword). 362 */ 363 int 364 biospci_write_config(uint32_t locator, int offset, int width, uint32_t val) 365 { 366 v86.ctl = V86_FLAGS; 367 v86.addr = PCI_INT; 368 v86.eax = WRITE_CONFIG_BYTE + width; 369 v86.ebx = locator; 370 v86.edi = offset; 371 v86.ecx = val; 372 v86int(); 373 374 /* error */ 375 if (V86_CY(v86.efl) || (v86.eax & 0xff00)) 376 return (-1); 377 378 return(0); 379 } 380 381 int 382 biospci_read_config(uint32_t locator, int offset, int width, uint32_t *val) 383 { 384 v86.ctl = V86_FLAGS; 385 v86.addr = PCI_INT; 386 v86.eax = READ_CONFIG_BYTE + width; 387 v86.ebx = locator; 388 v86.edi = offset; 389 v86int(); 390 391 /* error */ 392 if (V86_CY(v86.efl) || (v86.eax & 0xff00)) 393 return (-1); 394 395 *val = v86.ecx; 396 return (0); 397 } 398 399 uint32_t 400 biospci_locator(int8_t bus, uint8_t device, uint8_t function) 401 { 402 403 return ((bus << 8) | ((device & 0x1f) << 3) | (function & 0x7)); 404 } 405