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 #include <init.h>
  19 #include <log.h>
  20 #include <linux/delay.h>
  21
  22 #include <command.h>
  23 #include <env.h>
  24 #include <errno.h>
  25 #include <asm/processor.h>
  26 #include <asm/io.h>
  27 #include <pci.h>
  28
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 #define PCI_HOSE_OP(rw, size, type)                                     \
  32 int pci_hose_##rw##_config_##size(struct pci_controller *hose,          \
  33                                   pci_dev_t dev,                        \
  34                                   int offset, type value)               \
  35 {                                                                       \
  36         return hose->rw##_##size(hose, dev, offset, value);             \
  37 }
  38
  39 PCI_HOSE_OP(read, byte, u8 *)
  40 PCI_HOSE_OP(read, word, u16 *)
  41 PCI_HOSE_OP(read, dword, u32 *)
  42 PCI_HOSE_OP(write, byte, u8)
  43 PCI_HOSE_OP(write, word, u16)
  44 PCI_HOSE_OP(write, dword, u32)
  45
  46 #define PCI_OP(rw, size, type, error_code)                              \
  47 int pci_##rw##_config_##size(pci_dev_t dev, int offset, type value)     \
  48 {                                                                       \
  49         struct pci_controller *hose = pci_bus_to_hose(PCI_BUS(dev));    \
  50                                                                         \
  51         if (!hose)                                                      \
  52         {                                                               \
  53                 error_code;                                             \
  54                 return -1;                                              \
  55         }                                                               \
  56                                                                         \
  57         return pci_hose_##rw##_config_##size(hose, dev, offset, value); \
  58 }
  59
  60 PCI_OP(read, byte, u8 *, *value = 0xff)
  61 PCI_OP(read, word, u16 *, *value = 0xffff)
  62 PCI_OP(read, dword, u32 *, *value = 0xffffffff)
  63 PCI_OP(write, byte, u8, )
  64 PCI_OP(write, word, u16, )
  65 PCI_OP(write, dword, u32, )
  66
  67 #define PCI_READ_VIA_DWORD_OP(size, type, off_mask)                     \
  68 int pci_hose_read_config_##size##_via_dword(struct pci_controller *hose,\
  69                                         pci_dev_t dev,                  \
  70                                         int offset, type val)           \
  71 {                                                                       \
  72         u32 val32;                                                      \
  73                                                                         \
  74         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0) { \
  75                 *val = -1;                                              \
  76                 return -1;                                              \
  77         }                                                               \
  78                                                                         \
  79         *val = (val32 >> ((offset & (int)off_mask) * 8));               \
  80                                                                         \
  81         return 0;                                                       \
  82 }
  83
  84 #define PCI_WRITE_VIA_DWORD_OP(size, type, off_mask, val_mask)          \
  85 int pci_hose_write_config_##size##_via_dword(struct pci_controller *hose,\
  86                                              pci_dev_t dev,             \
  87                                              int offset, type val)      \
  88 {                                                                       \
  89         u32 val32, mask, ldata, shift;                                  \
  90                                                                         \
  91         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0)\
  92                 return -1;                                              \
  93                                                                         \
  94         shift = ((offset & (int)off_mask) * 8);                         \
  95         ldata = (((unsigned long)val) & val_mask) << shift;             \
  96         mask = val_mask << shift;                                       \
  97         val32 = (val32 & ~mask) | ldata;                                \
  98                                                                         \
  99         if (pci_hose_write_config_dword(hose, dev, offset & 0xfc, val32) < 0)\
 100                 return -1;                                              \
 101                                                                         \
 102         return 0;                                                       \
 103 }
 104
 105 PCI_READ_VIA_DWORD_OP(byte, u8 *, 0x03)
 106 PCI_READ_VIA_DWORD_OP(word, u16 *, 0x02)
 107 PCI_WRITE_VIA_DWORD_OP(byte, u8, 0x03, 0x000000ff)
 108 PCI_WRITE_VIA_DWORD_OP(word, u16, 0x02, 0x0000ffff)
 109
 110 /*
 111  *
 112  */
 113
 114 static struct pci_controller* hose_head;
 115
 116 struct pci_controller *pci_get_hose_head(void)
 117 {
 118         if (gd->hose)
 119                 return gd->hose;
 120
 121         return hose_head;
 122 }
 123
 124 void pci_register_hose(struct pci_controller* hose)
 125 {
 126         struct pci_controller **phose = &hose_head;
 127
 128         while(*phose)
 129                 phose = &(*phose)->next;
 130
 131         hose->next = NULL;
 132
 133         *phose = hose;
 134 }
 135
 136 struct pci_controller *pci_bus_to_hose(int bus)
 137 {
 138         struct pci_controller *hose;
 139
 140         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 141                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 142                         return hose;
 143         }
 144
 145         printf("pci_bus_to_hose() failed\n");
 146         return NULL;
 147 }
 148
 149 struct pci_controller *find_hose_by_cfg_addr(void *cfg_addr)
 150 {
 151         struct pci_controller *hose;
 152
 153         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 154                 if (hose->cfg_addr == cfg_addr)
 155                         return hose;
 156         }
 157
 158         return NULL;
 159 }
 160
 161 int pci_last_busno(void)
 162 {
 163         struct pci_controller *hose = pci_get_hose_head();
 164
 165         if (!hose)
 166                 return -1;
 167
 168         while (hose->next)
 169                 hose = hose->next;
 170
 171         return hose->last_busno;
 172 }
 173
 174 pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
 175 {
 176         struct pci_controller * hose;
 177         pci_dev_t bdf;
 178         int bus;
 179
 180         for (hose = pci_get_hose_head(); hose; hose = hose->next) {
 181                 for (bus = hose->first_busno; bus <= hose->last_busno; bus++) {
 182                         bdf = pci_hose_find_devices(hose, bus, ids, &index);
 183                         if (bdf != -1)
 184                                 return bdf;
 185                 }
 186         }
 187
 188         return -1;
 189 }
 190
 191 static int pci_hose_config_device(struct pci_controller *hose, pci_dev_t dev,
 192                                   ulong io, pci_addr_t mem, ulong command)
 193 {
 194         u32 bar_response;
 195         unsigned int old_command;
 196         pci_addr_t bar_value;
 197         pci_size_t bar_size;
 198         unsigned char pin;
 199         int bar, found_mem64;
 200
 201         debug("PCI Config: I/O=0x%lx, Memory=0x%llx, Command=0x%lx\n", io,
 202                 (u64)mem, command);
 203
 204         pci_hose_write_config_dword(hose, dev, PCI_COMMAND, 0);
 205
 206         for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_5; bar += 4) {
 207                 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
 208                 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
 209
 210                 if (!bar_response)
 211                         continue;
 212
 213                 found_mem64 = 0;
 214
 215                 /* Check the BAR type and set our address mask */
 216                 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
 217                         bar_size = ~(bar_response & PCI_BASE_ADDRESS_IO_MASK) + 1;
 218                         /* round up region base address to a multiple of size */
 219                         io = ((io - 1) | (bar_size - 1)) + 1;
 220                         bar_value = io;
 221                         /* compute new region base address */
 222                         io = io + bar_size;
 223                 } else {
 224                         if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
 225                                 PCI_BASE_ADDRESS_MEM_TYPE_64) {
 226                                 u32 bar_response_upper;
 227                                 u64 bar64;
 228                                 pci_hose_write_config_dword(hose, dev, bar + 4,
 229                                         0xffffffff);
 230                                 pci_hose_read_config_dword(hose, dev, bar + 4,
 231                                         &bar_response_upper);
 232
 233                                 bar64 = ((u64)bar_response_upper << 32) | bar_response;
 234
 235                                 bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
 236                                 found_mem64 = 1;
 237                         } else {
 238                                 bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1);
 239                         }
 240
 241                         /* round up region base address to multiple of size */
 242                         mem = ((mem - 1) | (bar_size - 1)) + 1;
 243                         bar_value = mem;
 244                         /* compute new region base address */
 245                         mem = mem + bar_size;
 246                 }
 247
 248                 /* Write it out and update our limit */
 249                 pci_hose_write_config_dword (hose, dev, bar, (u32)bar_value);
 250
 251                 if (found_mem64) {
 252                         bar += 4;
 253 #ifdef CONFIG_SYS_PCI_64BIT
 254                         pci_hose_write_config_dword(hose, dev, bar,
 255                                 (u32)(bar_value >> 32));
 256 #else
 257                         pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
 258 #endif
 259                 }
 260         }
 261
 262         /* Configure Cache Line Size Register */
 263         pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
 264
 265         /* Configure Latency Timer */
 266         pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
 267
 268         /* Disable interrupt line, if device says it wants to use interrupts */
 269         pci_hose_read_config_byte(hose, dev, PCI_INTERRUPT_PIN, &pin);
 270         if (pin != 0) {
 271                 pci_hose_write_config_byte(hose, dev, PCI_INTERRUPT_LINE,
 272                                            PCI_INTERRUPT_LINE_DISABLE);
 273         }
 274
 275         pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &old_command);
 276         pci_hose_write_config_dword(hose, dev, PCI_COMMAND,
 277                                      (old_command & 0xffff0000) | command);
 278
 279         return 0;
 280 }
 281
 282 /*
 283  *
 284  */
 285
 286 struct pci_config_table *pci_find_config(struct pci_controller *hose,
 287                                          unsigned short class,
 288                                          unsigned int vendor,
 289                                          unsigned int device,
 290                                          unsigned int bus,
 291                                          unsigned int dev,
 292                                          unsigned int func)
 293 {
 294         struct pci_config_table *table;
 295
 296         for (table = hose->config_table; table && table->vendor; table++) {
 297                 if ((table->vendor == PCI_ANY_ID || table->vendor == vendor) &&
 298                     (table->device == PCI_ANY_ID || table->device == device) &&
 299                     (table->class  == PCI_ANY_ID || table->class  == class)  &&
 300                     (table->bus    == PCI_ANY_ID || table->bus    == bus)    &&
 301                     (table->dev    == PCI_ANY_ID || table->dev    == dev)    &&
 302                     (table->func   == PCI_ANY_ID || table->func   == func)) {
 303                         return table;
 304                 }
 305         }
 306
 307         return NULL;
 308 }
 309
 310 void pci_cfgfunc_config_device(struct pci_controller *hose,
 311                                pci_dev_t dev,
 312                                struct pci_config_table *entry)
 313 {
 314         pci_hose_config_device(hose, dev, entry->priv[0], entry->priv[1],
 315                 entry->priv[2]);
 316 }
 317
 318 void pci_cfgfunc_do_nothing(struct pci_controller *hose,
 319                             pci_dev_t dev, struct pci_config_table *entry)
 320 {
 321 }
 322
 323 /*
 324  * HJF: Changed this to return int. I think this is required
 325  * to get the correct result when scanning bridges
 326  */
 327 extern int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev);
 328
 329 #ifdef CONFIG_PCI_SCAN_SHOW
 330 __weak int pci_print_dev(struct pci_controller *hose, pci_dev_t dev)
 331 {
 332         if (dev == PCI_BDF(hose->first_busno, 0, 0))
 333                 return 0;
 334
 335         return 1;
 336 }
 337 #endif /* CONFIG_PCI_SCAN_SHOW */
 338
 339 int pci_hose_scan_bus(struct pci_controller *hose, int bus)
 340 {
 341         unsigned int sub_bus, found_multi = 0;
 342         unsigned short vendor, device, class;
 343         unsigned char header_type;
 344 #ifndef CONFIG_PCI_PNP
 345         struct pci_config_table *cfg;
 346 #endif
 347         pci_dev_t dev;
 348 #ifdef CONFIG_PCI_SCAN_SHOW
 349         static int indent = 0;
 350 #endif
 351
 352         sub_bus = bus;
 353
 354         for (dev =  PCI_BDF(bus,0,0);
 355              dev <  PCI_BDF(bus, PCI_MAX_PCI_DEVICES - 1,
 356                                 PCI_MAX_PCI_FUNCTIONS - 1);
 357              dev += PCI_BDF(0, 0, 1)) {
 358
 359                 if (pci_skip_dev(hose, dev))
 360                         continue;
 361
 362                 if (PCI_FUNC(dev) && !found_multi)
 363                         continue;
 364
 365                 pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type);
 366
 367                 pci_hose_read_config_word(hose, dev, PCI_VENDOR_ID, &vendor);
 368
 369                 if (vendor == 0xffff || vendor == 0x0000)
 370                         continue;
 371
 372                 if (!PCI_FUNC(dev))
 373                         found_multi = header_type & 0x80;
 374
 375                 debug("PCI Scan: Found Bus %d, Device %d, Function %d\n",
 376                         PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
 377
 378                 pci_hose_read_config_word(hose, dev, PCI_DEVICE_ID, &device);
 379                 pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 380
 381 #ifdef CONFIG_PCI_FIXUP_DEV
 382                 board_pci_fixup_dev(hose, dev, vendor, device, class);
 383 #endif
 384
 385 #ifdef CONFIG_PCI_SCAN_SHOW
 386                 indent++;
 387
 388                 /* Print leading space, including bus indentation */
 389                 printf("%*c", indent + 1, ' ');
 390
 391                 if (pci_print_dev(hose, dev)) {
 392                         printf("%02x:%02x.%-*x - %04x:%04x - %s\n",
 393                                PCI_BUS(dev), PCI_DEV(dev), 6 - indent, PCI_FUNC(dev),
 394                                vendor, device, pci_class_str(class >> 8));
 395                 }
 396 #endif
 397
 398 #ifdef CONFIG_PCI_PNP
 399                 sub_bus = max((unsigned int)pciauto_config_device(hose, dev),
 400                               sub_bus);
 401 #else
 402                 cfg = pci_find_config(hose, class, vendor, device,
 403                                       PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
 404                 if (cfg) {
 405                         cfg->config_device(hose, dev, cfg);
 406                         sub_bus = max(sub_bus,
 407                                       (unsigned int)hose->current_busno);
 408                 }
 409 #endif
 410
 411 #ifdef CONFIG_PCI_SCAN_SHOW
 412                 indent--;
 413 #endif
 414
 415                 if (hose->fixup_irq)
 416                         hose->fixup_irq(hose, dev);
 417         }
 418
 419         return sub_bus;
 420 }
 421
 422 int pci_hose_scan(struct pci_controller *hose)
 423 {
 424 #if defined(CONFIG_PCI_BOOTDELAY)
 425         char *s;
 426         int i;
 427
 428         if (!gd->pcidelay_done) {
 429                 /* wait "pcidelay" ms (if defined)... */
 430                 s = env_get("pcidelay");
 431                 if (s) {
 432                         int val = simple_strtoul(s, NULL, 10);
 433                         for (i = 0; i < val; i++)
 434                                 udelay(1000);
 435                 }
 436                 gd->pcidelay_done = 1;
 437         }
 438 #endif /* CONFIG_PCI_BOOTDELAY */
 439
 440 #ifdef CONFIG_PCI_SCAN_SHOW
 441         puts("PCI:\n");
 442 #endif
 443
 444         /*
 445          * Start scan at current_busno.
 446          * PCIe will start scan at first_busno+1.
 447          */
 448         /* For legacy support, ensure current >= first */
 449         if (hose->first_busno > hose->current_busno)
 450                 hose->current_busno = hose->first_busno;
 451 #ifdef CONFIG_PCI_PNP
 452         pciauto_config_init(hose);
 453 #endif
 454         return pci_hose_scan_bus(hose, hose->current_busno);
 455 }
 456
 457 int pci_init(void)
 458 {
 459         hose_head = NULL;
 460
 461         /* allow env to disable pci init/enum */
 462         if (env_get("pcidisable") != NULL)
 463                 return 0;
 464
 465         /* now call board specific pci_init()... */
 466         pci_init_board();
 467
 468         return 0;
 469 }
 470
 471 /* Returns the address of the requested capability structure within the
 472  * device's PCI configuration space or 0 in case the device does not
 473  * support it.
 474  * */
 475 int pci_hose_find_capability(struct pci_controller *hose, pci_dev_t dev,
 476                              int cap)
 477 {
 478         int pos;
 479         u8 hdr_type;
 480
 481         pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &hdr_type);
 482
 483         pos = pci_hose_find_cap_start(hose, dev, hdr_type & 0x7F);
 484
 485         if (pos)
 486                 pos = pci_find_cap(hose, dev, pos, cap);
 487
 488         return pos;
 489 }
 490
 491 /* Find the header pointer to the Capabilities*/
 492 int pci_hose_find_cap_start(struct pci_controller *hose, pci_dev_t dev,
 493                             u8 hdr_type)
 494 {
 495         u16 status;
 496
 497         pci_hose_read_config_word(hose, dev, PCI_STATUS, &status);
 498
 499         if (!(status & PCI_STATUS_CAP_LIST))
 500                 return 0;
 501
 502         switch (hdr_type) {
 503         case PCI_HEADER_TYPE_NORMAL:
 504         case PCI_HEADER_TYPE_BRIDGE:
 505                 return PCI_CAPABILITY_LIST;
 506         case PCI_HEADER_TYPE_CARDBUS:
 507                 return PCI_CB_CAPABILITY_LIST;
 508         default:
 509                 return 0;
 510         }
 511 }
 512
 513 int pci_find_cap(struct pci_controller *hose, pci_dev_t dev, int pos, int cap)
 514 {
 515         int ttl = PCI_FIND_CAP_TTL;
 516         u8 id;
 517         u8 next_pos;
 518
 519         while (ttl--) {
 520                 pci_hose_read_config_byte(hose, dev, pos, &next_pos);
 521                 if (next_pos < CAP_START_POS)
 522                         break;
 523                 next_pos &= ~3;
 524                 pos = (int) next_pos;
 525                 pci_hose_read_config_byte(hose, dev,
 526                                           pos + PCI_CAP_LIST_ID, &id);
 527                 if (id == 0xff)
 528                         break;
 529                 if (id == cap)
 530                         return pos;
 531                 pos += PCI_CAP_LIST_NEXT;
 532         }
 533         return 0;
 534 }
 535
 536 /**
 537  * pci_find_next_ext_capability - Find an extended capability
 538  *
 539  * Returns the address of the next matching extended capability structure
 540  * within the device's PCI configuration space or 0 if the device does
 541  * not support it.  Some capabilities can occur several times, e.g., the
 542  * vendor-specific capability, and this provides a way to find them all.
 543  */
 544 int pci_find_next_ext_capability(struct pci_controller *hose, pci_dev_t dev,
 545                                  int start, int cap)
 546 {
 547         u32 header;
 548         int ttl, pos = PCI_CFG_SPACE_SIZE;
 549
 550         /* minimum 8 bytes per capability */
 551         ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
 552
 553         if (start)
 554                 pos = start;
 555
 556         pci_hose_read_config_dword(hose, dev, pos, &header);
 557         if (header == 0xffffffff || header == 0)
 558                 return 0;
 559
 560         while (ttl-- > 0) {
 561                 if (PCI_EXT_CAP_ID(header) == cap && pos != start)
 562                         return pos;
 563
 564                 pos = PCI_EXT_CAP_NEXT(header);
 565                 if (pos < PCI_CFG_SPACE_SIZE)
 566                         break;
 567
 568                 pci_hose_read_config_dword(hose, dev, pos, &header);
 569                 if (header == 0xffffffff || header == 0)
 570                         break;
 571         }
 572
 573         return 0;
 574 }
 575
 576 /**
 577  * pci_hose_find_ext_capability - Find an extended capability
 578  *
 579  * Returns the address of the requested extended capability structure
 580  * within the device's PCI configuration space or 0 if the device does
 581  * not support it.
 582  */
 583 int pci_hose_find_ext_capability(struct pci_controller *hose, pci_dev_t dev,
 584                                  int cap)
 585 {
 586         return pci_find_next_ext_capability(hose, dev, 0, cap);
 587 }