drivers/pci/pci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Andreas Heppel <aheppel@sysgo.de>
   5  *
   6  * (C) Copyright 2002, 2003
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  */
   9
  10 /*
  11  * Old PCI routines
  12  *
  13  * Do not change this file. Instead, convert your board to use CONFIG_DM_PCI
  14  * and change pci-uclass.c.
  15  */
  16
  17 #include <common.h>
  18
  19 #include <command.h>
  20 #include <env.h>
  21 #include <errno.h>
  22 #include <asm/processor.h>
  23 #include <asm/io.h>
  24 #include <pci.h>
  25
  26 DECLARE_GLOBAL_DATA_PTR;
  27
  28 #define PCI_HOSE_OP(rw, size, type)                                     \
  29 int pci_hose_##rw##_config_##size(struct pci_controller *hose,          \
  30                                   pci_dev_t dev,                        \
  31                                   int offset, type value)               \
  32 {                                                                       \
  33         return hose->rw##_##size(hose, dev, offset, value);             \
  34 }
  35
  36 PCI_HOSE_OP(read, byte, u8 *)
  37 PCI_HOSE_OP(read, word, u16 *)
  38 PCI_HOSE_OP(read, dword, u32 *)
  39 PCI_HOSE_OP(write, byte, u8)
  40 PCI_HOSE_OP(write, word, u16)
  41 PCI_HOSE_OP(write, dword, u32)
  42
  43 #define PCI_OP(rw, size, type, error_code)                              \
  44 int pci_##rw##_config_##size(pci_dev_t dev, int offset, type value)     \
  45 {                                                                       \
  46         struct pci_controller *hose = pci_bus_to_hose(PCI_BUS(dev));    \
  47                                                                         \
  48         if (!hose)                                                      \
  49         {                                                               \
  50                 error_code;                                             \
  51                 return -1;                                              \
  52         }                                                               \
  53                                                                         \
  54         return pci_hose_##rw##_config_##size(hose, dev, offset, value); \
  55 }
  56
  57 PCI_OP(read, byte, u8 *, *value = 0xff)
  58 PCI_OP(read, word, u16 *, *value = 0xffff)
  59 PCI_OP(read, dword, u32 *, *value = 0xffffffff)
  60 PCI_OP(write, byte, u8, )
  61 PCI_OP(write, word, u16, )
  62 PCI_OP(write, dword, u32, )
  63
  64 #define PCI_READ_VIA_DWORD_OP(size, type, off_mask)                     \
  65 int pci_hose_read_config_##size##_via_dword(struct pci_controller *hose,\
  66                                         pci_dev_t dev,                  \
  67                                         int offset, type val)           \
  68 {                                                                       \
  69         u32 val32;                                                      \
  70                                                                         \
  71         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0) { \
  72                 *val = -1;                                              \
  73                 return -1;                                              \
  74         }                                                               \
  75                                                                         \
  76         *val = (val32 >> ((offset & (int)off_mask) * 8));               \
  77                                                                         \
  78         return 0;                                                       \
  79 }
  80
  81 #define PCI_WRITE_VIA_DWORD_OP(size, type, off_mask, val_mask)          \
  82 int pci_hose_write_config_##size##_via_dword(struct pci_controller *hose,\
  83                                              pci_dev_t dev,             \
  84                                              int offset, type val)      \
  85 {                                                                       \
  86         u32 val32, mask, ldata, shift;                                  \
  87                                                                         \
  88         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0)\
  89                 return -1;                                              \
  90                                                                         \
  91         shift = ((offset & (int)off_mask) * 8);                         \
  92         ldata = (((unsigned long)val) & val_mask) << shift;             \
  93         mask = val_mask << shift;                                       \
  94         val32 = (val32 & ~mask) | ldata;                                \
  95                                                                         \
  96         if (pci_hose_write_config_dword(hose, dev, offset & 0xfc, val32) < 0)\
  97                 return -1;                                              \
  98                                                                         \
  99         return 0;                                                       \
 100 }
 101
 102 PCI_READ_VIA_DWORD_OP(byte, u8 *, 0x03)
 103 PCI_READ_VIA_DWORD_OP(word, u16 *, 0x02)
 104 PCI_WRITE_VIA_DWORD_OP(byte, u8, 0x03, 0x000000ff)
 105 PCI_WRITE_VIA_DWORD_OP(word, u16, 0x02, 0x0000ffff)
 106
 107 /*
 108  *
 109  */
 110
 111 static struct pci_controller* hose_head;
 112
 113 struct pci_controller *pci_get_hose_head(void)
 114 {
 115         if (gd->hose)
 116                 return gd->hose;
 117
 118         return hose_head;
 119 }
 120
 121 void pci_register_hose(struct pci_controller* hose)
 122 {
 123         struct pci_controller **phose = &hose_head;
 124
 125         while(*phose)
 126                 phose = &(*phose)->next;
 127
 128         hose->next = NULL;
 129
 130         *phose = hose;
 131 }
 132
 133 struct pci_controller *pci_bus_to_hose(int bus)
 134 {
 135         struct pci_controller *hose;
 136
 137         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 138                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 139                         return hose;
 140         }
 141
 142         printf("pci_bus_to_hose() failed\n");
 143         return NULL;
 144 }
 145
 146 struct pci_controller *find_hose_by_cfg_addr(void *cfg_addr)
 147 {
 148         struct pci_controller *hose;
 149
 150         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 151                 if (hose->cfg_addr == cfg_addr)
 152                         return hose;
 153         }
 154
 155         return NULL;
 156 }
 157
 158 int pci_last_busno(void)
 159 {
 160         struct pci_controller *hose = pci_get_hose_head();
 161
 162         if (!hose)
 163                 return -1;
 164
 165         while (hose->next)
 166                 hose = hose->next;
 167
 168         return hose->last_busno;
 169 }
 170
 171 pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
 172 {
 173         struct pci_controller * hose;
 174         pci_dev_t bdf;
 175         int bus;
 176
 177         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 178                 for (bus = hose->first_busno; bus <= hose->last_busno; bus++) {
 179                         bdf = pci_hose_find_devices(hose, bus, ids, &index);
 180                         if (bdf != -1)
 181                                 return bdf;
 182                 }
 183         }
 184
 185         return -1;
 186 }
 187
 188 static int pci_hose_config_device(struct pci_controller *hose, pci_dev_t dev,
 189                                   ulong io, pci_addr_t mem, ulong command)
 190 {
 191         u32 bar_response;
 192         unsigned int old_command;
 193         pci_addr_t bar_value;
 194         pci_size_t bar_size;
 195         unsigned char pin;
 196         int bar, found_mem64;
 197
 198         debug("PCI Config: I/O=0x%lx, Memory=0x%llx, Command=0x%lx\n", io,
 199                 (u64)mem, command);
 200
 201         pci_hose_write_config_dword(hose, dev, PCI_COMMAND, 0);
 202
 203         for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_5; bar += 4) {
 204                 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
 205                 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
 206
 207                 if (!bar_response)
 208                         continue;
 209
 210                 found_mem64 = 0;
 211
 212                 /* Check the BAR type and set our address mask */
 213                 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
 214                         bar_size = ~(bar_response & PCI_BASE_ADDRESS_IO_MASK) + 1;
 215                         /* round up region base address to a multiple of size */
 216                         io = ((io - 1) | (bar_size - 1)) + 1;
 217                         bar_value = io;
 218                         /* compute new region base address */
 219                         io = io + bar_size;
 220                 } else {
 221                         if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
 222                                 PCI_BASE_ADDRESS_MEM_TYPE_64) {
 223                                 u32 bar_response_upper;
 224                                 u64 bar64;
 225                                 pci_hose_write_config_dword(hose, dev, bar + 4,
 226                                         0xffffffff);
 227                                 pci_hose_read_config_dword(hose, dev, bar + 4,
 228                                         &bar_response_upper);
 229
 230                                 bar64 = ((u64)bar_response_upper << 32) | bar_response;
 231
 232                                 bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
 233                                 found_mem64 = 1;
 234                         } else {
 235                                 bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1);
 236                         }
 237
 238                         /* round up region base address to multiple of size */
 239                         mem = ((mem - 1) | (bar_size - 1)) + 1;
 240                         bar_value = mem;
 241                         /* compute new region base address */
 242                         mem = mem + bar_size;
 243                 }
 244
 245                 /* Write it out and update our limit */
 246                 pci_hose_write_config_dword (hose, dev, bar, (u32)bar_value);
 247
 248                 if (found_mem64) {
 249                         bar += 4;
 250 #ifdef CONFIG_SYS_PCI_64BIT
 251                         pci_hose_write_config_dword(hose, dev, bar,
 252                                 (u32)(bar_value >> 32));
 253 #else
 254                         pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
 255 #endif
 256                 }
 257         }
 258
 259         /* Configure Cache Line Size Register */
 260         pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
 261
 262         /* Configure Latency Timer */
 263         pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
 264
 265         /* Disable interrupt line, if device says it wants to use interrupts */
 266         pci_hose_read_config_byte(hose, dev, PCI_INTERRUPT_PIN, &pin);
 267         if (pin != 0) {
 268                 pci_hose_write_config_byte(hose, dev, PCI_INTERRUPT_LINE,
 269                                            PCI_INTERRUPT_LINE_DISABLE);
 270         }
 271
 272         pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &old_command);
 273         pci_hose_write_config_dword(hose, dev, PCI_COMMAND,
 274                                      (old_command & 0xffff0000) | command);
 275
 276         return 0;
 277 }
 278
 279 /*
 280  *
 281  */
 282
 283 struct pci_config_table *pci_find_config(struct pci_controller *hose,
 284                                          unsigned short class,
 285                                          unsigned int vendor,
 286                                          unsigned int device,
 287                                          unsigned int bus,
 288                                          unsigned int dev,
 289                                          unsigned int func)
 290 {
 291         struct pci_config_table *table;
 292
 293         for (table = hose->config_table; table && table->vendor; table++) {
 294                 if ((table->vendor == PCI_ANY_ID || table->vendor == vendor) &&
 295                     (table->device == PCI_ANY_ID || table->device == device) &&
 296                     (table->class  == PCI_ANY_ID || table->class  == class)  &&
 297                     (table->bus    == PCI_ANY_ID || table->bus    == bus)    &&
 298                     (table->dev    == PCI_ANY_ID || table->dev    == dev)    &&
 299                     (table->func   == PCI_ANY_ID || table->func   == func)) {
 300                         return table;
 301                 }
 302         }
 303
 304         return NULL;
 305 }
 306
 307 void pci_cfgfunc_config_device(struct pci_controller *hose,
 308                                pci_dev_t dev,
 309                                struct pci_config_table *entry)
 310 {
 311         pci_hose_config_device(hose, dev, entry->priv[0], entry->priv[1],
 312                 entry->priv[2]);
 313 }
 314
 315 void pci_cfgfunc_do_nothing(struct pci_controller *hose,
 316                             pci_dev_t dev, struct pci_config_table *entry)
 317 {
 318 }
 319
 320 /*
 321  * HJF: Changed this to return int. I think this is required
 322  * to get the correct result when scanning bridges
 323  */
 324 extern int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev);
 325
 326 #ifdef CONFIG_PCI_SCAN_SHOW
 327 __weak int pci_print_dev(struct pci_controller *hose, pci_dev_t dev)
 328 {
 329         if (dev == PCI_BDF(hose->first_busno, 0, 0))
 330                 return 0;
 331
 332         return 1;
 333 }
 334 #endif /* CONFIG_PCI_SCAN_SHOW */
 335
 336 int pci_hose_scan_bus(struct pci_controller *hose, int bus)
 337 {
 338         unsigned int sub_bus, found_multi = 0;
 339         unsigned short vendor, device, class;
 340         unsigned char header_type;
 341 #ifndef CONFIG_PCI_PNP
 342         struct pci_config_table *cfg;
 343 #endif
 344         pci_dev_t dev;
 345 #ifdef CONFIG_PCI_SCAN_SHOW
 346         static int indent = 0;
 347 #endif
 348
 349         sub_bus = bus;
 350
 351         for (dev =  PCI_BDF(bus,0,0);
 352              dev <  PCI_BDF(bus, PCI_MAX_PCI_DEVICES - 1,
 353                                 PCI_MAX_PCI_FUNCTIONS - 1);
 354              dev += PCI_BDF(0, 0, 1)) {
 355
 356                 if (pci_skip_dev(hose, dev))
 357                         continue;
 358
 359                 if (PCI_FUNC(dev) && !found_multi)
 360                         continue;
 361
 362                 pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type);
 363
 364                 pci_hose_read_config_word(hose, dev, PCI_VENDOR_ID, &vendor);
 365
 366                 if (vendor == 0xffff || vendor == 0x0000)
 367                         continue;
 368
 369                 if (!PCI_FUNC(dev))
 370                         found_multi = header_type & 0x80;
 371
 372                 debug("PCI Scan: Found Bus %d, Device %d, Function %d\n",
 373                         PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
 374
 375                 pci_hose_read_config_word(hose, dev, PCI_DEVICE_ID, &device);
 376                 pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 377
 378 #ifdef CONFIG_PCI_FIXUP_DEV
 379                 board_pci_fixup_dev(hose, dev, vendor, device, class);
 380 #endif
 381
 382 #ifdef CONFIG_PCI_SCAN_SHOW
 383                 indent++;
 384
 385                 /* Print leading space, including bus indentation */
 386                 printf("%*c", indent + 1, ' ');
 387
 388                 if (pci_print_dev(hose, dev)) {
 389                         printf("%02x:%02x.%-*x - %04x:%04x - %s\n",
 390                                PCI_BUS(dev), PCI_DEV(dev), 6 - indent, PCI_FUNC(dev),
 391                                vendor, device, pci_class_str(class >> 8));
 392                 }
 393 #endif
 394
 395 #ifdef CONFIG_PCI_PNP
 396                 sub_bus = max((unsigned int)pciauto_config_device(hose, dev),
 397                               sub_bus);
 398 #else
 399                 cfg = pci_find_config(hose, class, vendor, device,
 400                                       PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
 401                 if (cfg) {
 402                         cfg->config_device(hose, dev, cfg);
 403                         sub_bus = max(sub_bus,
 404                                       (unsigned int)hose->current_busno);
 405                 }
 406 #endif
 407
 408 #ifdef CONFIG_PCI_SCAN_SHOW
 409                 indent--;
 410 #endif
 411
 412                 if (hose->fixup_irq)
 413                         hose->fixup_irq(hose, dev);
 414         }
 415
 416         return sub_bus;
 417 }
 418
 419 int pci_hose_scan(struct pci_controller *hose)
 420 {
 421 #if defined(CONFIG_PCI_BOOTDELAY)
 422         char *s;
 423         int i;
 424
 425         if (!gd->pcidelay_done) {
 426                 /* wait "pcidelay" ms (if defined)... */
 427                 s = env_get("pcidelay");
 428                 if (s) {
 429                         int val = simple_strtoul(s, NULL, 10);
 430                         for (i = 0; i < val; i++)
 431                                 udelay(1000);
 432                 }
 433                 gd->pcidelay_done = 1;
 434         }
 435 #endif /* CONFIG_PCI_BOOTDELAY */
 436
 437 #ifdef CONFIG_PCI_SCAN_SHOW
 438         puts("PCI:\n");
 439 #endif
 440
 441         /*
 442          * Start scan at current_busno.
 443          * PCIe will start scan at first_busno+1.
 444          */
 445         /* For legacy support, ensure current >= first */
 446         if (hose->first_busno > hose->current_busno)
 447                 hose->current_busno = hose->first_busno;
 448 #ifdef CONFIG_PCI_PNP
 449         pciauto_config_init(hose);
 450 #endif
 451         return pci_hose_scan_bus(hose, hose->current_busno);
 452 }
 453
 454 void pci_init(void)
 455 {
 456         hose_head = NULL;
 457
 458         /* allow env to disable pci init/enum */
 459         if (env_get("pcidisable") != NULL)
 460                 return;
 461
 462         /* now call board specific pci_init()... */
 463         pci_init_board();
 464 }
 465
 466 /* Returns the address of the requested capability structure within the
 467  * device's PCI configuration space or 0 in case the device does not
 468  * support it.
 469  * */
 470 int pci_hose_find_capability(struct pci_controller *hose, pci_dev_t dev,
 471                              int cap)
 472 {
 473         int pos;
 474         u8 hdr_type;
 475
 476         pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &hdr_type);
 477
 478         pos = pci_hose_find_cap_start(hose, dev, hdr_type & 0x7F);
 479
 480         if (pos)
 481                 pos = pci_find_cap(hose, dev, pos, cap);
 482
 483         return pos;
 484 }
 485
 486 /* Find the header pointer to the Capabilities*/
 487 int pci_hose_find_cap_start(struct pci_controller *hose, pci_dev_t dev,
 488                             u8 hdr_type)
 489 {
 490         u16 status;
 491
 492         pci_hose_read_config_word(hose, dev, PCI_STATUS, &status);
 493
 494         if (!(status & PCI_STATUS_CAP_LIST))
 495                 return 0;
 496
 497         switch (hdr_type) {
 498         case PCI_HEADER_TYPE_NORMAL:
 499         case PCI_HEADER_TYPE_BRIDGE:
 500                 return PCI_CAPABILITY_LIST;
 501         case PCI_HEADER_TYPE_CARDBUS:
 502                 return PCI_CB_CAPABILITY_LIST;
 503         default:
 504                 return 0;
 505         }
 506 }
 507
 508 int pci_find_cap(struct pci_controller *hose, pci_dev_t dev, int pos, int cap)
 509 {
 510         int ttl = PCI_FIND_CAP_TTL;
 511         u8 id;
 512         u8 next_pos;
 513
 514         while (ttl--) {
 515                 pci_hose_read_config_byte(hose, dev, pos, &next_pos);
 516                 if (next_pos < CAP_START_POS)
 517                         break;
 518                 next_pos &= ~3;
 519                 pos = (int) next_pos;
 520                 pci_hose_read_config_byte(hose, dev,
 521                                           pos + PCI_CAP_LIST_ID, &id);
 522                 if (id == 0xff)
 523                         break;
 524                 if (id == cap)
 525                         return pos;
 526                 pos += PCI_CAP_LIST_NEXT;
 527         }
 528         return 0;
 529 }
 530
 531 /**
 532  * pci_find_next_ext_capability - Find an extended capability
 533  *
 534  * Returns the address of the next matching extended capability structure
 535  * within the device's PCI configuration space or 0 if the device does
 536  * not support it.  Some capabilities can occur several times, e.g., the
 537  * vendor-specific capability, and this provides a way to find them all.
 538  */
 539 int pci_find_next_ext_capability(struct pci_controller *hose, pci_dev_t dev,
 540                                  int start, int cap)
 541 {
 542         u32 header;
 543         int ttl, pos = PCI_CFG_SPACE_SIZE;
 544
 545         /* minimum 8 bytes per capability */
 546         ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
 547
 548         if (start)
 549                 pos = start;
 550
 551         pci_hose_read_config_dword(hose, dev, pos, &header);
 552         if (header == 0xffffffff || header == 0)
 553                 return 0;
 554
 555         while (ttl-- > 0) {
 556                 if (PCI_EXT_CAP_ID(header) == cap && pos != start)
 557                         return pos;
 558
 559                 pos = PCI_EXT_CAP_NEXT(header);
 560                 if (pos < PCI_CFG_SPACE_SIZE)
 561                         break;
 562
 563                 pci_hose_read_config_dword(hose, dev, pos, &header);
 564                 if (header == 0xffffffff || header == 0)
 565                         break;
 566         }
 567
 568         return 0;
 569 }
 570
 571 /**
 572  * pci_hose_find_ext_capability - Find an extended capability
 573  *
 574  * Returns the address of the requested extended capability structure
 575  * within the device's PCI configuration space or 0 if the device does
 576  * not support it.
 577  */
 578 int pci_hose_find_ext_capability(struct pci_controller *hose, pci_dev_t dev,
 579                                  int cap)
 580 {
 581         return pci_find_next_ext_capability(hose, dev, 0, cap);
 582 }