drivers/pci/pci.c

   1 /*
   2  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   3  * Andreas Heppel <aheppel@sysgo.de>
   4  *
   5  * (C) Copyright 2002, 2003
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 /*
  12  * PCI routines
  13  */
  14
  15 #include <common.h>
  16
  17 #include <command.h>
  18 #include <errno.h>
  19 #include <asm/processor.h>
  20 #include <asm/io.h>
  21 #include <pci.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 #define PCI_HOSE_OP(rw, size, type)                                     \
  26 int pci_hose_##rw##_config_##size(struct pci_controller *hose,          \
  27                                   pci_dev_t dev,                        \
  28                                   int offset, type value)               \
  29 {                                                                       \
  30         return hose->rw##_##size(hose, dev, offset, value);             \
  31 }
  32
  33 PCI_HOSE_OP(read, byte, u8 *)
  34 PCI_HOSE_OP(read, word, u16 *)
  35 PCI_HOSE_OP(read, dword, u32 *)
  36 PCI_HOSE_OP(write, byte, u8)
  37 PCI_HOSE_OP(write, word, u16)
  38 PCI_HOSE_OP(write, dword, u32)
  39
  40 #define PCI_OP(rw, size, type, error_code)                              \
  41 int pci_##rw##_config_##size(pci_dev_t dev, int offset, type value)     \
  42 {                                                                       \
  43         struct pci_controller *hose = pci_bus_to_hose(PCI_BUS(dev));    \
  44                                                                         \
  45         if (!hose)                                                      \
  46         {                                                               \
  47                 error_code;                                             \
  48                 return -1;                                              \
  49         }                                                               \
  50                                                                         \
  51         return pci_hose_##rw##_config_##size(hose, dev, offset, value); \
  52 }
  53
  54 PCI_OP(read, byte, u8 *, *value = 0xff)
  55 PCI_OP(read, word, u16 *, *value = 0xffff)
  56 PCI_OP(read, dword, u32 *, *value = 0xffffffff)
  57 PCI_OP(write, byte, u8, )
  58 PCI_OP(write, word, u16, )
  59 PCI_OP(write, dword, u32, )
  60
  61 #define PCI_READ_VIA_DWORD_OP(size, type, off_mask)                     \
  62 int pci_hose_read_config_##size##_via_dword(struct pci_controller *hose,\
  63                                         pci_dev_t dev,                  \
  64                                         int offset, type val)           \
  65 {                                                                       \
  66         u32 val32;                                                      \
  67                                                                         \
  68         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0) { \
  69                 *val = -1;                                              \
  70                 return -1;                                              \
  71         }                                                               \
  72                                                                         \
  73         *val = (val32 >> ((offset & (int)off_mask) * 8));               \
  74                                                                         \
  75         return 0;                                                       \
  76 }
  77
  78 #define PCI_WRITE_VIA_DWORD_OP(size, type, off_mask, val_mask)          \
  79 int pci_hose_write_config_##size##_via_dword(struct pci_controller *hose,\
  80                                              pci_dev_t dev,             \
  81                                              int offset, type val)      \
  82 {                                                                       \
  83         u32 val32, mask, ldata, shift;                                  \
  84                                                                         \
  85         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0)\
  86                 return -1;                                              \
  87                                                                         \
  88         shift = ((offset & (int)off_mask) * 8);                         \
  89         ldata = (((unsigned long)val) & val_mask) << shift;             \
  90         mask = val_mask << shift;                                       \
  91         val32 = (val32 & ~mask) | ldata;                                \
  92                                                                         \
  93         if (pci_hose_write_config_dword(hose, dev, offset & 0xfc, val32) < 0)\
  94                 return -1;                                              \
  95                                                                         \
  96         return 0;                                                       \
  97 }
  98
  99 PCI_READ_VIA_DWORD_OP(byte, u8 *, 0x03)
 100 PCI_READ_VIA_DWORD_OP(word, u16 *, 0x02)
 101 PCI_WRITE_VIA_DWORD_OP(byte, u8, 0x03, 0x000000ff)
 102 PCI_WRITE_VIA_DWORD_OP(word, u16, 0x02, 0x0000ffff)
 103
 104 /*
 105  *
 106  */
 107
 108 static struct pci_controller* hose_head;
 109
 110 struct pci_controller *pci_get_hose_head(void)
 111 {
 112         if (gd->hose)
 113                 return gd->hose;
 114
 115         return hose_head;
 116 }
 117
 118 void pci_register_hose(struct pci_controller* hose)
 119 {
 120         struct pci_controller **phose = &hose_head;
 121
 122         while(*phose)
 123                 phose = &(*phose)->next;
 124
 125         hose->next = NULL;
 126
 127         *phose = hose;
 128 }
 129
 130 struct pci_controller *pci_bus_to_hose(int bus)
 131 {
 132         struct pci_controller *hose;
 133
 134         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 135                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 136                         return hose;
 137         }
 138
 139         printf("pci_bus_to_hose() failed\n");
 140         return NULL;
 141 }
 142
 143 struct pci_controller *find_hose_by_cfg_addr(void *cfg_addr)
 144 {
 145         struct pci_controller *hose;
 146
 147         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 148                 if (hose->cfg_addr == cfg_addr)
 149                         return hose;
 150         }
 151
 152         return NULL;
 153 }
 154
 155 int pci_last_busno(void)
 156 {
 157         struct pci_controller *hose = pci_get_hose_head();
 158
 159         if (!hose)
 160                 return -1;
 161
 162         while (hose->next)
 163                 hose = hose->next;
 164
 165         return hose->last_busno;
 166 }
 167
 168 pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
 169 {
 170         struct pci_controller * hose;
 171         pci_dev_t bdf;
 172         int bus;
 173
 174         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 175 #ifdef CONFIG_SYS_SCSI_SCAN_BUS_REVERSE
 176                 for (bus = hose->last_busno; bus >= hose->first_busno; bus--) {
 177 #else
 178                 for (bus = hose->first_busno; bus <= hose->last_busno; bus++) {
 179 #endif
 180                         bdf = pci_hose_find_devices(hose, bus, ids, &index);
 181                         if (bdf != -1)
 182                                 return bdf;
 183                 }
 184         }
 185
 186         return -1;
 187 }
 188
 189 int pci_hose_config_device(struct pci_controller *hose,
 190                            pci_dev_t dev,
 191                            unsigned long io,
 192                            pci_addr_t mem,
 193                            unsigned long command)
 194 {
 195         u32 bar_response;
 196         unsigned int old_command;
 197         pci_addr_t bar_value;
 198         pci_size_t bar_size;
 199         unsigned char pin;
 200         int bar, found_mem64;
 201
 202         debug("PCI Config: I/O=0x%lx, Memory=0x%llx, Command=0x%lx\n", io,
 203                 (u64)mem, command);
 204
 205         pci_hose_write_config_dword(hose, dev, PCI_COMMAND, 0);
 206
 207         for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_5; bar += 4) {
 208                 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
 209                 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
 210
 211                 if (!bar_response)
 212                         continue;
 213
 214                 found_mem64 = 0;
 215
 216                 /* Check the BAR type and set our address mask */
 217                 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
 218                         bar_size = ~(bar_response & PCI_BASE_ADDRESS_IO_MASK) + 1;
 219                         /* round up region base address to a multiple of size */
 220                         io = ((io - 1) | (bar_size - 1)) + 1;
 221                         bar_value = io;
 222                         /* compute new region base address */
 223                         io = io + bar_size;
 224                 } else {
 225                         if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
 226                                 PCI_BASE_ADDRESS_MEM_TYPE_64) {
 227                                 u32 bar_response_upper;
 228                                 u64 bar64;
 229                                 pci_hose_write_config_dword(hose, dev, bar + 4,
 230                                         0xffffffff);
 231                                 pci_hose_read_config_dword(hose, dev, bar + 4,
 232                                         &bar_response_upper);
 233
 234                                 bar64 = ((u64)bar_response_upper << 32) | bar_response;
 235
 236                                 bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
 237                                 found_mem64 = 1;
 238                         } else {
 239                                 bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1);
 240                         }
 241
 242                         /* round up region base address to multiple of size */
 243                         mem = ((mem - 1) | (bar_size - 1)) + 1;
 244                         bar_value = mem;
 245                         /* compute new region base address */
 246                         mem = mem + bar_size;
 247                 }
 248
 249                 /* Write it out and update our limit */
 250                 pci_hose_write_config_dword (hose, dev, bar, (u32)bar_value);
 251
 252                 if (found_mem64) {
 253                         bar += 4;
 254 #ifdef CONFIG_SYS_PCI_64BIT
 255                         pci_hose_write_config_dword(hose, dev, bar,
 256                                 (u32)(bar_value >> 32));
 257 #else
 258                         pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
 259 #endif
 260                 }
 261         }
 262
 263         /* Configure Cache Line Size Register */
 264         pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
 265
 266         /* Configure Latency Timer */
 267         pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
 268
 269         /* Disable interrupt line, if device says it wants to use interrupts */
 270         pci_hose_read_config_byte(hose, dev, PCI_INTERRUPT_PIN, &pin);
 271         if (pin != 0) {
 272                 pci_hose_write_config_byte(hose, dev, PCI_INTERRUPT_LINE,
 273                                            PCI_INTERRUPT_LINE_DISABLE);
 274         }
 275
 276         pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &old_command);
 277         pci_hose_write_config_dword(hose, dev, PCI_COMMAND,
 278                                      (old_command & 0xffff0000) | command);
 279
 280         return 0;
 281 }
 282
 283 /*
 284  *
 285  */
 286
 287 struct pci_config_table *pci_find_config(struct pci_controller *hose,
 288                                          unsigned short class,
 289                                          unsigned int vendor,
 290                                          unsigned int device,
 291                                          unsigned int bus,
 292                                          unsigned int dev,
 293                                          unsigned int func)
 294 {
 295         struct pci_config_table *table;
 296
 297         for (table = hose->config_table; table && table->vendor; table++) {
 298                 if ((table->vendor == PCI_ANY_ID || table->vendor == vendor) &&
 299                     (table->device == PCI_ANY_ID || table->device == device) &&
 300                     (table->class  == PCI_ANY_ID || table->class  == class)  &&
 301                     (table->bus    == PCI_ANY_ID || table->bus    == bus)    &&
 302                     (table->dev    == PCI_ANY_ID || table->dev    == dev)    &&
 303                     (table->func   == PCI_ANY_ID || table->func   == func)) {
 304                         return table;
 305                 }
 306         }
 307
 308         return NULL;
 309 }
 310
 311 void pci_cfgfunc_config_device(struct pci_controller *hose,
 312                                pci_dev_t dev,
 313                                struct pci_config_table *entry)
 314 {
 315         pci_hose_config_device(hose, dev, entry->priv[0], entry->priv[1],
 316                 entry->priv[2]);
 317 }
 318
 319 void pci_cfgfunc_do_nothing(struct pci_controller *hose,
 320                             pci_dev_t dev, struct pci_config_table *entry)
 321 {
 322 }
 323
 324 /*
 325  * HJF: Changed this to return int. I think this is required
 326  * to get the correct result when scanning bridges
 327  */
 328 extern int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev);
 329
 330 #ifdef CONFIG_PCI_SCAN_SHOW
 331 __weak int pci_print_dev(struct pci_controller *hose, pci_dev_t dev)
 332 {
 333         if (dev == PCI_BDF(hose->first_busno, 0, 0))
 334                 return 0;
 335
 336         return 1;
 337 }
 338 #endif /* CONFIG_PCI_SCAN_SHOW */
 339
 340 int pci_hose_scan_bus(struct pci_controller *hose, int bus)
 341 {
 342         unsigned int sub_bus, found_multi = 0;
 343         unsigned short vendor, device, class;
 344         unsigned char header_type;
 345 #ifndef CONFIG_PCI_PNP
 346         struct pci_config_table *cfg;
 347 #endif
 348         pci_dev_t dev;
 349 #ifdef CONFIG_PCI_SCAN_SHOW
 350         static int indent = 0;
 351 #endif
 352
 353         sub_bus = bus;
 354
 355         for (dev =  PCI_BDF(bus,0,0);
 356              dev <  PCI_BDF(bus, PCI_MAX_PCI_DEVICES - 1,
 357                                 PCI_MAX_PCI_FUNCTIONS - 1);
 358              dev += PCI_BDF(0, 0, 1)) {
 359
 360                 if (pci_skip_dev(hose, dev))
 361                         continue;
 362
 363                 if (PCI_FUNC(dev) && !found_multi)
 364                         continue;
 365
 366                 pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type);
 367
 368                 pci_hose_read_config_word(hose, dev, PCI_VENDOR_ID, &vendor);
 369
 370                 if (vendor == 0xffff || vendor == 0x0000)
 371                         continue;
 372
 373                 if (!PCI_FUNC(dev))
 374                         found_multi = header_type & 0x80;
 375
 376                 debug("PCI Scan: Found Bus %d, Device %d, Function %d\n",
 377                         PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
 378
 379                 pci_hose_read_config_word(hose, dev, PCI_DEVICE_ID, &device);
 380                 pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 381
 382 #ifdef CONFIG_PCI_FIXUP_DEV
 383                 board_pci_fixup_dev(hose, dev, vendor, device, class);
 384 #endif
 385
 386 #ifdef CONFIG_PCI_SCAN_SHOW
 387                 indent++;
 388
 389                 /* Print leading space, including bus indentation */
 390                 printf("%*c", indent + 1, ' ');
 391
 392                 if (pci_print_dev(hose, dev)) {
 393                         printf("%02x:%02x.%-*x - %04x:%04x - %s\n",
 394                                PCI_BUS(dev), PCI_DEV(dev), 6 - indent, PCI_FUNC(dev),
 395                                vendor, device, pci_class_str(class >> 8));
 396                 }
 397 #endif
 398
 399 #ifdef CONFIG_PCI_PNP
 400                 sub_bus = max((unsigned int)pciauto_config_device(hose, dev),
 401                               sub_bus);
 402 #else
 403                 cfg = pci_find_config(hose, class, vendor, device,
 404                                       PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
 405                 if (cfg) {
 406                         cfg->config_device(hose, dev, cfg);
 407                         sub_bus = max(sub_bus,
 408                                       (unsigned int)hose->current_busno);
 409                 }
 410 #endif
 411
 412 #ifdef CONFIG_PCI_SCAN_SHOW
 413                 indent--;
 414 #endif
 415
 416                 if (hose->fixup_irq)
 417                         hose->fixup_irq(hose, dev);
 418         }
 419
 420         return sub_bus;
 421 }
 422
 423 int pci_hose_scan(struct pci_controller *hose)
 424 {
 425 #if defined(CONFIG_PCI_BOOTDELAY)
 426         char *s;
 427         int i;
 428
 429         if (!gd->pcidelay_done) {
 430                 /* wait "pcidelay" ms (if defined)... */
 431                 s = getenv("pcidelay");
 432                 if (s) {
 433                         int val = simple_strtoul(s, NULL, 10);
 434                         for (i = 0; i < val; i++)
 435                                 udelay(1000);
 436                 }
 437                 gd->pcidelay_done = 1;
 438         }
 439 #endif /* CONFIG_PCI_BOOTDELAY */
 440
 441 #ifdef CONFIG_PCI_SCAN_SHOW
 442         puts("PCI:\n");
 443 #endif
 444
 445         /*
 446          * Start scan at current_busno.
 447          * PCIe will start scan at first_busno+1.
 448          */
 449         /* For legacy support, ensure current >= first */
 450         if (hose->first_busno > hose->current_busno)
 451                 hose->current_busno = hose->first_busno;
 452 #ifdef CONFIG_PCI_PNP
 453         pciauto_config_init(hose);
 454 #endif
 455         return pci_hose_scan_bus(hose, hose->current_busno);
 456 }
 457
 458 void pci_init(void)
 459 {
 460         hose_head = NULL;
 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 }