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