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 /* 30 * PnP enumerator using the PCI BIOS. 31 */ 32 33 #include <stand.h> 34 #include <machine/stdarg.h> 35 #include <bootstrap.h> 36 #include <isapnp.h> 37 #include <btxv86.h> 38 #include "libi386.h" 39 40 /* 41 * Stupid PCI BIOS interface doesn't let you simply enumerate everything 42 * that's there, instead you have to ask it if it has something. 43 * 44 * So we have to scan by class code, subclass code and sometimes programming 45 * interface. 46 */ 47 48 struct pci_progif 49 { 50 int pi_code; 51 const char *pi_name; 52 }; 53 54 static struct pci_progif progif_null[] = { 55 {0x0, NULL}, 56 {-1, NULL} 57 }; 58 59 static struct pci_progif progif_display[] = { 60 {0x0, "VGA"}, 61 {0x1, "8514"}, 62 {-1, NULL} 63 }; 64 65 static struct pci_progif progif_ide[] = { 66 {0x00, NULL}, 67 {0x01, NULL}, 68 {0x02, NULL}, 69 {0x03, NULL}, 70 {0x04, NULL}, 71 {0x05, NULL}, 72 {0x06, NULL}, 73 {0x07, NULL}, 74 {0x08, NULL}, 75 {0x09, NULL}, 76 {0x0a, NULL}, 77 {0x0b, NULL}, 78 {0x0c, NULL}, 79 {0x0d, NULL}, 80 {0x0e, NULL}, 81 {0x0f, NULL}, 82 {0x80, NULL}, 83 {0x81, NULL}, 84 {0x82, NULL}, 85 {0x83, NULL}, 86 {0x84, NULL}, 87 {0x85, NULL}, 88 {0x86, NULL}, 89 {0x87, NULL}, 90 {0x88, NULL}, 91 {0x89, NULL}, 92 {0x8a, NULL}, 93 {0x8b, NULL}, 94 {0x8c, NULL}, 95 {0x8d, NULL}, 96 {0x8e, NULL}, 97 {0x8f, NULL}, 98 {-1, NULL} 99 }; 100 101 static struct pci_progif progif_serial[] = { 102 {0x0, "8250"}, 103 {0x1, "16450"}, 104 {0x2, "16550"}, 105 {-1, NULL} 106 }; 107 108 static struct pci_progif progif_parallel[] = { 109 {0x0, "Standard"}, 110 {0x1, "Bidirectional"}, 111 {0x2, "ECP"}, 112 {-1, NULL} 113 }; 114 115 static struct pci_progif progif_firewire[] = { 116 {0x10, "OHCI"}, 117 {-1, NULL} 118 }; 119 120 struct pci_subclass 121 { 122 int ps_subclass; 123 const char *ps_name; 124 struct pci_progif *ps_progif; /* if set, use for programming interface value(s) */ 125 }; 126 127 static struct pci_subclass subclass_old[] = { 128 {0x0, "Old non-VGA", progif_null}, 129 {0x1, "Old VGA", progif_null}, 130 {-1, NULL, NULL} 131 }; 132 133 static struct pci_subclass subclass_mass[] = { 134 {0x0, "SCSI", progif_null}, 135 {0x1, "IDE", progif_ide}, 136 {0x2, "Floppy disk", progif_null}, 137 {0x3, "IPI", progif_null}, 138 {0x4, "RAID", progif_null}, 139 {0x80, "mass storage", progif_null}, 140 {-1, NULL, NULL} 141 }; 142 143 static struct pci_subclass subclass_net[] = { 144 {0x0, "Ethernet", progif_null}, 145 {0x1, "Token ring", progif_null}, 146 {0x2, "FDDI", progif_null}, 147 {0x3, "ATM", progif_null}, 148 {0x80, "network", progif_null}, 149 {-1, NULL, NULL} 150 }; 151 152 static struct pci_subclass subclass_display[] = { 153 {0x0, NULL, progif_display}, 154 {0x1, "XGA", progif_null}, 155 {0x80, "other", progif_null}, 156 {-1, NULL, NULL} 157 }; 158 159 static struct pci_subclass subclass_comms[] = { 160 {0x0, "serial", progif_serial}, 161 {0x1, "parallel", progif_parallel}, 162 {0x80, "communications", progif_null}, 163 {-1, NULL, NULL} 164 }; 165 166 static struct pci_subclass subclass_serial[] = { 167 {0x0, "FireWire", progif_firewire}, 168 {0x1, "ACCESS.bus", progif_null}, 169 {0x2, "SSA", progif_null}, 170 {0x3, "USB", progif_null}, 171 {0x4, "Fibrechannel", progif_null}, 172 {-1, NULL, NULL} 173 }; 174 175 static struct pci_class 176 { 177 int pc_class; 178 const char *pc_name; 179 struct pci_subclass *pc_subclass; 180 } pci_classes[] = { 181 {0x0, "device", subclass_old}, 182 {0x1, "controller", subclass_mass}, 183 {0x2, "controller", subclass_net}, 184 {0x3, "display", subclass_display}, 185 {0x7, "controller", subclass_comms}, 186 {0xc, "controller", subclass_serial}, 187 {-1, NULL, NULL} 188 }; 189 190 static void biospci_enumerate(void); 191 static void biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi); 192 193 struct pnphandler biospcihandler = 194 { 195 "PCI BIOS", 196 biospci_enumerate 197 }; 198 static int biospci_version; 199 200 #define PCI_BIOS_PRESENT 0xb101 201 #define FIND_PCI_DEVICE 0xb102 202 #define FIND_PCI_CLASS_CODE 0xb103 203 #define GENERATE_SPECIAL_CYCLE 0xb106 204 #define READ_CONFIG_BYTE 0xb108 205 #define READ_CONFIG_WORD 0xb109 206 #define READ_CONFIG_DWORD 0xb10a 207 #define WRITE_CONFIG_BYTE 0xb10b 208 #define WRITE_CONFIG_WORD 0xb10c 209 #define WRITE_CONFIG_DWORD 0xb10d 210 #define GET_IRQ_ROUTING_OPTIONS 0xb10e 211 #define SET_PCI_IRQ 0xb10f 212 213 #define PCI_INT 0x1a 214 215 #define PCI_SIGNATURE 0x20494350 /* AKA "PCI " */ 216 217 void 218 biospci_detect(void) 219 { 220 uint16_t version, hwcap, maxbus; 221 char buf[24]; 222 223 /* Find the PCI BIOS */ 224 v86.ctl = V86_FLAGS; 225 v86.addr = PCI_INT; 226 v86.eax = PCI_BIOS_PRESENT; 227 v86.edi = 0x0; 228 v86int(); 229 230 /* Check for OK response */ 231 if (V86_CY(v86.efl) || ((v86.eax & 0xff00) != 0) || 232 (v86.edx != PCI_SIGNATURE)) 233 return; 234 235 version = v86.ebx & 0xffff; 236 hwcap = v86.eax & 0xff; 237 maxbus = v86.ecx & 0xff; 238 #if 0 239 printf("PCI BIOS %d.%d%s%s maxbus %d\n", 240 bcd2bin((version >> 8) & 0xf), bcd2bin(version & 0xf), 241 (hwcap & 1) ? " config1" : "", (hwcap & 2) ? " config2" : "", 242 maxbus); 243 #endif 244 sprintf(buf, "%d", bcd2bin((version >> 8) & 0xf)); 245 setenv("pcibios.major", buf, 1); 246 sprintf(buf, "%d", bcd2bin(version & 0xf)); 247 setenv("pcibios.minor", buf, 1); 248 sprintf(buf, "%d", !!(hwcap & 1)); 249 setenv("pcibios.config1", buf, 1); 250 sprintf(buf, "%d", !!(hwcap & 2)); 251 setenv("pcibios.config2", buf, 1); 252 sprintf(buf, "%d", maxbus); 253 setenv("pcibios.maxbus", buf, 1); 254 biospci_version = bcd2bin((version >> 8) & 0xf) * 10 + bcd2bin(version & 0xf); 255 } 256 257 static void 258 biospci_enumerate(void) 259 { 260 int device_index, err; 261 uint32_t locator, devid; 262 struct pci_class *pc; 263 struct pci_subclass *psc; 264 struct pci_progif *ppi; 265 266 /* Iterate over known classes */ 267 for (pc = pci_classes; pc->pc_class >= 0; pc++) { 268 /* Iterate over subclasses */ 269 for (psc = pc->pc_subclass; psc->ps_subclass >= 0; psc++) { 270 /* Iterate over programming interfaces */ 271 for (ppi = psc->ps_progif; ppi->pi_code >= 0; ppi++) { 272 273 /* Scan for matches */ 274 for (device_index = 0; ; device_index++) { 275 /* Look for a match */ 276 err = biospci_find_devclass((pc->pc_class << 16) 277 + (psc->ps_subclass << 8) + ppi->pi_code, 278 device_index, &locator); 279 if (err != 0) 280 break; 281 282 /* Read the device identifier from the nominated device */ 283 err = biospci_read_config(locator, 0, BIOSPCI_32BITS, &devid); 284 if (err != 0) 285 break; 286 287 /* We have the device ID, create a PnP object and save everything */ 288 biospci_addinfo(devid, pc, psc, ppi); 289 } 290 } 291 } 292 } 293 } 294 295 static void 296 biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi) 297 { 298 struct pnpinfo *pi; 299 char desc[80]; 300 301 302 /* build the description */ 303 desc[0] = 0; 304 if (ppi->pi_name != NULL) { 305 strcat(desc, ppi->pi_name); 306 strcat(desc, " "); 307 } 308 if (psc->ps_name != NULL) { 309 strcat(desc, psc->ps_name); 310 strcat(desc, " "); 311 } 312 if (pc->pc_name != NULL) 313 strcat(desc, pc->pc_name); 314 315 pi = pnp_allocinfo(); 316 pi->pi_desc = strdup(desc); 317 sprintf(desc,"0x%08x", devid); 318 pnp_addident(pi, desc); 319 pnp_addinfo(pi); 320 } 321 322 int 323 biospci_find_devclass(uint32_t class, int index, uint32_t *locator) 324 { 325 v86.ctl = V86_FLAGS; 326 v86.addr = PCI_INT; 327 v86.eax = FIND_PCI_CLASS_CODE; 328 v86.ecx = class; 329 v86.esi = index; 330 v86int(); 331 332 /* error */ 333 if (V86_CY(v86.efl) || (v86.eax & 0xff00)) 334 return (-1); 335 336 *locator = v86.ebx; 337 return (0); 338 } 339 340 static int 341 biospci_find_device(uint32_t devid, int index, uint32_t *locator) 342 { 343 v86.ctl = V86_FLAGS; 344 v86.addr = PCI_INT; 345 v86.eax = FIND_PCI_DEVICE; 346 v86.edx = devid & 0xffff; /* EDX - Vendor ID */ 347 v86.ecx = (devid >> 16) & 0xffff; /* ECX - Device ID */ 348 v86.esi = index; 349 v86int(); 350 351 /* error */ 352 if (V86_CY(v86.efl) || (v86.eax & 0xff00)) 353 return (-1); 354 355 *locator = v86.ebx; 356 return (0); 357 } 358 /* 359 * Configuration space access methods. 360 * width = 0(byte), 1(word) or 2(dword). 361 */ 362 int 363 biospci_write_config(uint32_t locator, int offset, int width, uint32_t val) 364 { 365 v86.ctl = V86_FLAGS; 366 v86.addr = PCI_INT; 367 v86.eax = WRITE_CONFIG_BYTE + width; 368 v86.ebx = locator; 369 v86.edi = offset; 370 v86.ecx = val; 371 v86int(); 372 373 /* error */ 374 if (V86_CY(v86.efl) || (v86.eax & 0xff00)) 375 return (-1); 376 377 return(0); 378 } 379 380 int 381 biospci_read_config(uint32_t locator, int offset, int width, uint32_t *val) 382 { 383 v86.ctl = V86_FLAGS; 384 v86.addr = PCI_INT; 385 v86.eax = READ_CONFIG_BYTE + width; 386 v86.ebx = locator; 387 v86.edi = offset; 388 v86int(); 389 390 /* error */ 391 if (V86_CY(v86.efl) || (v86.eax & 0xff00)) 392 return (-1); 393 394 *val = v86.ecx; 395 return (0); 396 } 397 398 uint32_t 399 biospci_locator(int8_t bus, uint8_t device, uint8_t function) 400 { 401 402 return ((bus << 8) | ((device & 0x1f) << 3) | (function & 0x7)); 403 } 404