drivers/pci/pci_auto.c

   1 /*
   2  * arch/powerpc/kernel/pci_auto.c
   3  *
   4  * PCI autoconfiguration library
   5  *
   6  * Author: Matt Porter <mporter@mvista.com>
   7  *
   8  * Copyright 2000 MontaVista Software Inc.
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 #include <common.h>
  14 #include <errno.h>
  15 #include <pci.h>
  16
  17 /* the user can define CONFIG_SYS_PCI_CACHE_LINE_SIZE to avoid problems */
  18 #ifndef CONFIG_SYS_PCI_CACHE_LINE_SIZE
  19 #define CONFIG_SYS_PCI_CACHE_LINE_SIZE  8
  20 #endif
  21
  22 /*
  23  *
  24  */
  25
  26 void pciauto_region_init(struct pci_region *res)
  27 {
  28         /*
  29          * Avoid allocating PCI resources from address 0 -- this is illegal
  30          * according to PCI 2.1 and moreover, this is known to cause Linux IDE
  31          * drivers to fail. Use a reasonable starting value of 0x1000 instead.
  32          */
  33         res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
  34 }
  35
  36 void pciauto_region_align(struct pci_region *res, pci_size_t size)
  37 {
  38         res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
  39 }
  40
  41 int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
  42         pci_addr_t *bar)
  43 {
  44         pci_addr_t addr;
  45
  46         if (!res) {
  47                 debug("No resource");
  48                 goto error;
  49         }
  50
  51         addr = ((res->bus_lower - 1) | (size - 1)) + 1;
  52
  53         if (addr - res->bus_start + size > res->size) {
  54                 debug("No room in resource");
  55                 goto error;
  56         }
  57
  58         res->bus_lower = addr + size;
  59
  60         debug("address=0x%llx bus_lower=0x%llx", (unsigned long long)addr,
  61               (unsigned long long)res->bus_lower);
  62
  63         *bar = addr;
  64         return 0;
  65
  66  error:
  67         *bar = (pci_addr_t)-1;
  68         return -1;
  69 }
  70
  71 /*
  72  *
  73  */
  74
  75 void pciauto_setup_device(struct pci_controller *hose,
  76                           pci_dev_t dev, int bars_num,
  77                           struct pci_region *mem,
  78                           struct pci_region *prefetch,
  79                           struct pci_region *io)
  80 {
  81         u32 bar_response;
  82         pci_size_t bar_size;
  83         u16 cmdstat = 0;
  84         int bar, bar_nr = 0;
  85         u8 header_type;
  86         int rom_addr;
  87 #ifndef CONFIG_PCI_ENUM_ONLY
  88         pci_addr_t bar_value;
  89         struct pci_region *bar_res;
  90         int found_mem64 = 0;
  91 #endif
  92
  93         pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
  94         cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
  95
  96         for (bar = PCI_BASE_ADDRESS_0;
  97                 bar < PCI_BASE_ADDRESS_0 + (bars_num * 4); bar += 4) {
  98                 /* Tickle the BAR and get the response */
  99 #ifndef CONFIG_PCI_ENUM_ONLY
 100                 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
 101 #endif
 102                 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
 103
 104                 /* If BAR is not implemented go to the next BAR */
 105                 if (!bar_response)
 106                         continue;
 107
 108 #ifndef CONFIG_PCI_ENUM_ONLY
 109                 found_mem64 = 0;
 110 #endif
 111
 112                 /* Check the BAR type and set our address mask */
 113                 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
 114                         bar_size = ((~(bar_response & PCI_BASE_ADDRESS_IO_MASK))
 115                                    & 0xffff) + 1;
 116 #ifndef CONFIG_PCI_ENUM_ONLY
 117                         bar_res = io;
 118 #endif
 119
 120                         debug("PCI Autoconfig: BAR %d, I/O, size=0x%llx, ",
 121                               bar_nr, (unsigned long long)bar_size);
 122                 } else {
 123                         if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
 124                              PCI_BASE_ADDRESS_MEM_TYPE_64) {
 125                                 u32 bar_response_upper;
 126                                 u64 bar64;
 127
 128 #ifndef CONFIG_PCI_ENUM_ONLY
 129                                 pci_hose_write_config_dword(hose, dev, bar + 4,
 130                                         0xffffffff);
 131 #endif
 132                                 pci_hose_read_config_dword(hose, dev, bar + 4,
 133                                         &bar_response_upper);
 134
 135                                 bar64 = ((u64)bar_response_upper << 32) | bar_response;
 136
 137                                 bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
 138 #ifndef CONFIG_PCI_ENUM_ONLY
 139                                 found_mem64 = 1;
 140 #endif
 141                         } else {
 142                                 bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1);
 143                         }
 144 #ifndef CONFIG_PCI_ENUM_ONLY
 145                         if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
 146                                 bar_res = prefetch;
 147                         else
 148                                 bar_res = mem;
 149 #endif
 150
 151                         debug("PCI Autoconfig: BAR %d, Mem, size=0x%llx, ",
 152                               bar_nr, (unsigned long long)bar_size);
 153                 }
 154
 155 #ifndef CONFIG_PCI_ENUM_ONLY
 156                 if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) {
 157                         /* Write it out and update our limit */
 158                         pci_hose_write_config_dword(hose, dev, bar, (u32)bar_value);
 159
 160                         if (found_mem64) {
 161                                 bar += 4;
 162 #ifdef CONFIG_SYS_PCI_64BIT
 163                                 pci_hose_write_config_dword(hose, dev, bar, (u32)(bar_value>>32));
 164 #else
 165                                 /*
 166                                  * If we are a 64-bit decoder then increment to the
 167                                  * upper 32 bits of the bar and force it to locate
 168                                  * in the lower 4GB of memory.
 169                                  */
 170                                 pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
 171 #endif
 172                         }
 173
 174                 }
 175 #endif
 176                 cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
 177                         PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
 178
 179                 debug("\n");
 180
 181                 bar_nr++;
 182         }
 183
 184         /* Configure the expansion ROM address */
 185         pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type);
 186         if (header_type != PCI_HEADER_TYPE_CARDBUS) {
 187                 rom_addr = (header_type == PCI_HEADER_TYPE_NORMAL) ?
 188                            PCI_ROM_ADDRESS : PCI_ROM_ADDRESS1;
 189                 pci_hose_write_config_dword(hose, dev, rom_addr, 0xfffffffe);
 190                 pci_hose_read_config_dword(hose, dev, rom_addr, &bar_response);
 191                 if (bar_response) {
 192                         bar_size = -(bar_response & ~1);
 193                         debug("PCI Autoconfig: ROM, size=%#x, ",
 194                               (unsigned int)bar_size);
 195                         if (pciauto_region_allocate(mem, bar_size,
 196                                                     &bar_value) == 0) {
 197                                 pci_hose_write_config_dword(hose, dev, rom_addr,
 198                                                             bar_value);
 199                         }
 200                         cmdstat |= PCI_COMMAND_MEMORY;
 201                         debug("\n");
 202                 }
 203         }
 204
 205         pci_hose_write_config_word(hose, dev, PCI_COMMAND, cmdstat);
 206         pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE,
 207                 CONFIG_SYS_PCI_CACHE_LINE_SIZE);
 208         pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
 209 }
 210
 211 void pciauto_prescan_setup_bridge(struct pci_controller *hose,
 212                                          pci_dev_t dev, int sub_bus)
 213 {
 214         struct pci_region *pci_mem;
 215         struct pci_region *pci_prefetch;
 216         struct pci_region *pci_io;
 217         u16 cmdstat, prefechable_64;
 218
 219 #ifdef CONFIG_DM_PCI
 220         /* The root controller has the region information */
 221         struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
 222
 223         pci_mem = ctlr_hose->pci_mem;
 224         pci_prefetch = ctlr_hose->pci_prefetch;
 225         pci_io = ctlr_hose->pci_io;
 226 #else
 227         pci_mem = hose->pci_mem;
 228         pci_prefetch = hose->pci_prefetch;
 229         pci_io = hose->pci_io;
 230 #endif
 231
 232         pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
 233         pci_hose_read_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
 234                                 &prefechable_64);
 235         prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
 236
 237         /* Configure bus number registers */
 238 #ifdef CONFIG_DM_PCI
 239         pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS, PCI_BUS(dev));
 240         pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS, sub_bus);
 241 #else
 242         pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS,
 243                                    PCI_BUS(dev) - hose->first_busno);
 244         pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS,
 245                                    sub_bus - hose->first_busno);
 246 #endif
 247         pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
 248
 249         if (pci_mem) {
 250                 /* Round memory allocator to 1MB boundary */
 251                 pciauto_region_align(pci_mem, 0x100000);
 252
 253                 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
 254                 pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE,
 255                                         (pci_mem->bus_lower & 0xfff00000) >> 16);
 256
 257                 cmdstat |= PCI_COMMAND_MEMORY;
 258         }
 259
 260         if (pci_prefetch) {
 261                 /* Round memory allocator to 1MB boundary */
 262                 pciauto_region_align(pci_prefetch, 0x100000);
 263
 264                 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
 265                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
 266                                         (pci_prefetch->bus_lower & 0xfff00000) >> 16);
 267                 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
 268 #ifdef CONFIG_SYS_PCI_64BIT
 269                         pci_hose_write_config_dword(hose, dev,
 270                                         PCI_PREF_BASE_UPPER32,
 271                                         pci_prefetch->bus_lower >> 32);
 272 #else
 273                         pci_hose_write_config_dword(hose, dev,
 274                                         PCI_PREF_BASE_UPPER32,
 275                                         0x0);
 276 #endif
 277
 278                 cmdstat |= PCI_COMMAND_MEMORY;
 279         } else {
 280                 /* We don't support prefetchable memory for now, so disable */
 281                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
 282                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x0);
 283                 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64) {
 284                         pci_hose_write_config_word(hose, dev, PCI_PREF_BASE_UPPER32, 0x0);
 285                         pci_hose_write_config_word(hose, dev, PCI_PREF_LIMIT_UPPER32, 0x0);
 286                 }
 287         }
 288
 289         if (pci_io) {
 290                 /* Round I/O allocator to 4KB boundary */
 291                 pciauto_region_align(pci_io, 0x1000);
 292
 293                 pci_hose_write_config_byte(hose, dev, PCI_IO_BASE,
 294                                         (pci_io->bus_lower & 0x0000f000) >> 8);
 295                 pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16,
 296                                         (pci_io->bus_lower & 0xffff0000) >> 16);
 297
 298                 cmdstat |= PCI_COMMAND_IO;
 299         }
 300
 301         /* Enable memory and I/O accesses, enable bus master */
 302         pci_hose_write_config_word(hose, dev, PCI_COMMAND,
 303                                         cmdstat | PCI_COMMAND_MASTER);
 304 }
 305
 306 void pciauto_postscan_setup_bridge(struct pci_controller *hose,
 307                                           pci_dev_t dev, int sub_bus)
 308 {
 309         struct pci_region *pci_mem;
 310         struct pci_region *pci_prefetch;
 311         struct pci_region *pci_io;
 312
 313 #ifdef CONFIG_DM_PCI
 314         /* The root controller has the region information */
 315         struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
 316
 317         pci_mem = ctlr_hose->pci_mem;
 318         pci_prefetch = ctlr_hose->pci_prefetch;
 319         pci_io = ctlr_hose->pci_io;
 320 #else
 321         pci_mem = hose->pci_mem;
 322         pci_prefetch = hose->pci_prefetch;
 323         pci_io = hose->pci_io;
 324 #endif
 325
 326         /* Configure bus number registers */
 327 #ifdef CONFIG_DM_PCI
 328         pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, sub_bus);
 329 #else
 330         pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS,
 331                                    sub_bus - hose->first_busno);
 332 #endif
 333
 334         if (pci_mem) {
 335                 /* Round memory allocator to 1MB boundary */
 336                 pciauto_region_align(pci_mem, 0x100000);
 337
 338                 pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT,
 339                                 (pci_mem->bus_lower - 1) >> 16);
 340         }
 341
 342         if (pci_prefetch) {
 343                 u16 prefechable_64;
 344
 345                 pci_hose_read_config_word(hose, dev,
 346                                         PCI_PREF_MEMORY_LIMIT,
 347                                         &prefechable_64);
 348                 prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
 349
 350                 /* Round memory allocator to 1MB boundary */
 351                 pciauto_region_align(pci_prefetch, 0x100000);
 352
 353                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT,
 354                                 (pci_prefetch->bus_lower - 1) >> 16);
 355                 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
 356 #ifdef CONFIG_SYS_PCI_64BIT
 357                         pci_hose_write_config_dword(hose, dev,
 358                                         PCI_PREF_LIMIT_UPPER32,
 359                                         (pci_prefetch->bus_lower - 1) >> 32);
 360 #else
 361                         pci_hose_write_config_dword(hose, dev,
 362                                         PCI_PREF_LIMIT_UPPER32,
 363                                         0x0);
 364 #endif
 365         }
 366
 367         if (pci_io) {
 368                 /* Round I/O allocator to 4KB boundary */
 369                 pciauto_region_align(pci_io, 0x1000);
 370
 371                 pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT,
 372                                 ((pci_io->bus_lower - 1) & 0x0000f000) >> 8);
 373                 pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16,
 374                                 ((pci_io->bus_lower - 1) & 0xffff0000) >> 16);
 375         }
 376 }
 377
 378 /*
 379  *
 380  */
 381
 382 void pciauto_config_init(struct pci_controller *hose)
 383 {
 384         int i;
 385
 386         hose->pci_io = hose->pci_mem = hose->pci_prefetch = NULL;
 387
 388         for (i = 0; i < hose->region_count; i++) {
 389                 switch(hose->regions[i].flags) {
 390                 case PCI_REGION_IO:
 391                         if (!hose->pci_io ||
 392                             hose->pci_io->size < hose->regions[i].size)
 393                                 hose->pci_io = hose->regions + i;
 394                         break;
 395                 case PCI_REGION_MEM:
 396                         if (!hose->pci_mem ||
 397                             hose->pci_mem->size < hose->regions[i].size)
 398                                 hose->pci_mem = hose->regions + i;
 399                         break;
 400                 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
 401                         if (!hose->pci_prefetch ||
 402                             hose->pci_prefetch->size < hose->regions[i].size)
 403                                 hose->pci_prefetch = hose->regions + i;
 404                         break;
 405                 }
 406         }
 407
 408
 409         if (hose->pci_mem) {
 410                 pciauto_region_init(hose->pci_mem);
 411
 412                 debug("PCI Autoconfig: Bus Memory region: [0x%llx-0x%llx],\n"
 413                        "\t\tPhysical Memory [%llx-%llxx]\n",
 414                     (u64)hose->pci_mem->bus_start,
 415                     (u64)(hose->pci_mem->bus_start + hose->pci_mem->size - 1),
 416                     (u64)hose->pci_mem->phys_start,
 417                     (u64)(hose->pci_mem->phys_start + hose->pci_mem->size - 1));
 418         }
 419
 420         if (hose->pci_prefetch) {
 421                 pciauto_region_init(hose->pci_prefetch);
 422
 423                 debug("PCI Autoconfig: Bus Prefetchable Mem: [0x%llx-0x%llx],\n"
 424                        "\t\tPhysical Memory [%llx-%llx]\n",
 425                     (u64)hose->pci_prefetch->bus_start,
 426                     (u64)(hose->pci_prefetch->bus_start +
 427                             hose->pci_prefetch->size - 1),
 428                     (u64)hose->pci_prefetch->phys_start,
 429                     (u64)(hose->pci_prefetch->phys_start +
 430                             hose->pci_prefetch->size - 1));
 431         }
 432
 433         if (hose->pci_io) {
 434                 pciauto_region_init(hose->pci_io);
 435
 436                 debug("PCI Autoconfig: Bus I/O region: [0x%llx-0x%llx],\n"
 437                        "\t\tPhysical Memory: [%llx-%llx]\n",
 438                     (u64)hose->pci_io->bus_start,
 439                     (u64)(hose->pci_io->bus_start + hose->pci_io->size - 1),
 440                     (u64)hose->pci_io->phys_start,
 441                     (u64)(hose->pci_io->phys_start + hose->pci_io->size - 1));
 442
 443         }
 444 }
 445
 446 /*
 447  * HJF: Changed this to return int. I think this is required
 448  * to get the correct result when scanning bridges
 449  */
 450 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 451 {
 452         struct pci_region *pci_mem;
 453         struct pci_region *pci_prefetch;
 454         struct pci_region *pci_io;
 455         unsigned int sub_bus = PCI_BUS(dev);
 456         unsigned short class;
 457         int n;
 458
 459 #ifdef CONFIG_DM_PCI
 460         /* The root controller has the region information */
 461         struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
 462
 463         pci_mem = ctlr_hose->pci_mem;
 464         pci_prefetch = ctlr_hose->pci_prefetch;
 465         pci_io = ctlr_hose->pci_io;
 466 #else
 467         pci_mem = hose->pci_mem;
 468         pci_prefetch = hose->pci_prefetch;
 469         pci_io = hose->pci_io;
 470 #endif
 471
 472         pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 473
 474         switch (class) {
 475         case PCI_CLASS_BRIDGE_PCI:
 476                 debug("PCI Autoconfig: Found P2P bridge, device %d\n",
 477                       PCI_DEV(dev));
 478
 479                 pciauto_setup_device(hose, dev, 2, pci_mem,
 480                                      pci_prefetch, pci_io);
 481
 482 #ifdef CONFIG_DM_PCI
 483                 n = dm_pci_hose_probe_bus(hose, dev);
 484                 if (n < 0)
 485                         return n;
 486                 sub_bus = (unsigned int)n;
 487 #else
 488                 /* Passing in current_busno allows for sibling P2P bridges */
 489                 hose->current_busno++;
 490                 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
 491                 /*
 492                  * need to figure out if this is a subordinate bridge on the bus
 493                  * to be able to properly set the pri/sec/sub bridge registers.
 494                  */
 495                 n = pci_hose_scan_bus(hose, hose->current_busno);
 496
 497                 /* figure out the deepest we've gone for this leg */
 498                 sub_bus = max((unsigned int)n, sub_bus);
 499                 pciauto_postscan_setup_bridge(hose, dev, sub_bus);
 500
 501                 sub_bus = hose->current_busno;
 502 #endif
 503                 break;
 504
 505         case PCI_CLASS_BRIDGE_CARDBUS:
 506                 /*
 507                  * just do a minimal setup of the bridge,
 508                  * let the OS take care of the rest
 509                  */
 510                 pciauto_setup_device(hose, dev, 0, pci_mem,
 511                                      pci_prefetch, pci_io);
 512
 513                 debug("PCI Autoconfig: Found P2CardBus bridge, device %d\n",
 514                       PCI_DEV(dev));
 515
 516 #ifndef CONFIG_DM_PCI
 517                 hose->current_busno++;
 518 #endif
 519                 break;
 520
 521 #if defined(CONFIG_PCIAUTO_SKIP_HOST_BRIDGE)
 522         case PCI_CLASS_BRIDGE_OTHER:
 523                 debug("PCI Autoconfig: Skipping bridge device %d\n",
 524                       PCI_DEV(dev));
 525                 break;
 526 #endif
 527 #if defined(CONFIG_MPC834x) && !defined(CONFIG_VME8349)
 528         case PCI_CLASS_BRIDGE_OTHER:
 529                 /*
 530                  * The host/PCI bridge 1 seems broken in 8349 - it presents
 531                  * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
 532                  * device claiming resources io/mem/irq.. we only allow for
 533                  * the PIMMR window to be allocated (BAR0 - 1MB size)
 534                  */
 535                 debug("PCI Autoconfig: Broken bridge found, only minimal config\n");
 536                 pciauto_setup_device(hose, dev, 0, hose->pci_mem,
 537                         hose->pci_prefetch, hose->pci_io);
 538                 break;
 539 #endif
 540
 541         case PCI_CLASS_PROCESSOR_POWERPC: /* an agent or end-point */
 542                 debug("PCI AutoConfig: Found PowerPC device\n");
 543
 544         default:
 545                 pciauto_setup_device(hose, dev, 6, pci_mem,
 546                                      pci_prefetch, pci_io);
 547                 break;
 548         }
 549
 550         return sub_bus;
 551 }