drivers/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  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 /*
  28  * PCI routines
  29  */
  30
  31 #include <common.h>
  32
  33 #ifdef CONFIG_PCI
  34
  35 #include <command.h>
  36 #include <asm/processor.h>
  37 #include <asm/io.h>
  38 #include <pci.h>
  39
  40 #define PCI_HOSE_OP(rw, size, type)                                     \
  41 int pci_hose_##rw##_config_##size(struct pci_controller *hose,          \
  42                                   pci_dev_t dev,                        \
  43                                   int offset, type value)               \
  44 {                                                                       \
  45         return hose->rw##_##size(hose, dev, offset, value);             \
  46 }
  47
  48 PCI_HOSE_OP(read, byte, u8 *)
  49 PCI_HOSE_OP(read, word, u16 *)
  50 PCI_HOSE_OP(read, dword, u32 *)
  51 PCI_HOSE_OP(write, byte, u8)
  52 PCI_HOSE_OP(write, word, u16)
  53 PCI_HOSE_OP(write, dword, u32)
  54
  55 #ifndef CONFIG_IXP425
  56 #define PCI_OP(rw, size, type, error_code)                              \
  57 int pci_##rw##_config_##size(pci_dev_t dev, int offset, type value)     \
  58 {                                                                       \
  59         struct pci_controller *hose = pci_bus_to_hose(PCI_BUS(dev));    \
  60                                                                         \
  61         if (!hose)                                                      \
  62         {                                                               \
  63                 error_code;                                             \
  64                 return -1;                                              \
  65         }                                                               \
  66                                                                         \
  67         return pci_hose_##rw##_config_##size(hose, dev, offset, value); \
  68 }
  69
  70 PCI_OP(read, byte, u8 *, *value = 0xff)
  71 PCI_OP(read, word, u16 *, *value = 0xffff)
  72 PCI_OP(read, dword, u32 *, *value = 0xffffffff)
  73 PCI_OP(write, byte, u8, )
  74 PCI_OP(write, word, u16, )
  75 PCI_OP(write, dword, u32, )
  76 #endif  /* CONFIG_IXP425 */
  77
  78 #define PCI_READ_VIA_DWORD_OP(size, type, off_mask)                     \
  79 int pci_hose_read_config_##size##_via_dword(struct pci_controller *hose,\
  80                                         pci_dev_t dev,                  \
  81                                         int offset, type val)           \
  82 {                                                                       \
  83         u32 val32;                                                      \
  84                                                                         \
  85         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0)\
  86                 return -1;                                              \
  87                                                                         \
  88         *val = (val32 >> ((offset & (int)off_mask) * 8));               \
  89                                                                         \
  90         return 0;                                                       \
  91 }
  92
  93 #define PCI_WRITE_VIA_DWORD_OP(size, type, off_mask, val_mask)          \
  94 int pci_hose_write_config_##size##_via_dword(struct pci_controller *hose,\
  95                                              pci_dev_t dev,             \
  96                                              int offset, type val)      \
  97 {                                                                       \
  98         u32 val32, mask, ldata, shift;                                  \
  99                                                                         \
 100         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0)\
 101                 return -1;                                              \
 102                                                                         \
 103         shift = ((offset & (int)off_mask) * 8);                         \
 104         ldata = (((unsigned long)val) & val_mask) << shift;             \
 105         mask = val_mask << shift;                                       \
 106         val32 = (val32 & ~mask) | ldata;                                \
 107                                                                         \
 108         if (pci_hose_write_config_dword(hose, dev, offset & 0xfc, val32) < 0)\
 109                 return -1;                                              \
 110                                                                         \
 111         return 0;                                                       \
 112 }
 113
 114 PCI_READ_VIA_DWORD_OP(byte, u8 *, 0x03)
 115 PCI_READ_VIA_DWORD_OP(word, u16 *, 0x02)
 116 PCI_WRITE_VIA_DWORD_OP(byte, u8, 0x03, 0x000000ff)
 117 PCI_WRITE_VIA_DWORD_OP(word, u16, 0x02, 0x0000ffff)
 118
 119 /*
 120  *
 121  */
 122
 123 static struct pci_controller* hose_head = NULL;
 124
 125 void pci_register_hose(struct pci_controller* hose)
 126 {
 127         struct pci_controller **phose = &hose_head;
 128
 129         while(*phose)
 130                 phose = &(*phose)->next;
 131
 132         hose->next = NULL;
 133
 134         *phose = hose;
 135 }
 136
 137 struct pci_controller *pci_bus_to_hose (int bus)
 138 {
 139         struct pci_controller *hose;
 140
 141         for (hose = hose_head; hose; hose = hose->next)
 142                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 143                         return hose;
 144
 145         printf("pci_bus_to_hose() failed\n");
 146         return NULL;
 147 }
 148
 149 #ifndef CONFIG_IXP425
 150 pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
 151 {
 152         struct pci_controller * hose;
 153         u16 vendor, device;
 154         u8 header_type;
 155         pci_dev_t bdf;
 156         int i, bus, found_multi = 0;
 157
 158         for (hose = hose_head; hose; hose = hose->next)
 159         {
 160 #ifdef CFG_SCSI_SCAN_BUS_REVERSE
 161                 for (bus = hose->last_busno; bus >= hose->first_busno; bus--)
 162 #else
 163                 for (bus = hose->first_busno; bus <= hose->last_busno; bus++)
 164 #endif
 165                         for (bdf = PCI_BDF(bus,0,0);
 166 #ifdef CONFIG_ELPPC
 167                              bdf < PCI_BDF(bus,PCI_MAX_PCI_DEVICES-1,PCI_MAX_PCI_FUNCTIONS-1);
 168 #else
 169                              bdf < PCI_BDF(bus+1,0,0);
 170 #endif
 171                              bdf += PCI_BDF(0,0,1))
 172                         {
 173                                 if (!PCI_FUNC(bdf)) {
 174                                         pci_read_config_byte(bdf,
 175                                                              PCI_HEADER_TYPE,
 176                                                              &header_type);
 177
 178                                         found_multi = header_type & 0x80;
 179                                 } else {
 180                                         if (!found_multi)
 181                                                 continue;
 182                                 }
 183
 184                                 pci_read_config_word(bdf,
 185                                                      PCI_VENDOR_ID,
 186                                                      &vendor);
 187                                 pci_read_config_word(bdf,
 188                                                      PCI_DEVICE_ID,
 189                                                      &device);
 190
 191                                 for (i=0; ids[i].vendor != 0; i++)
 192                                         if (vendor == ids[i].vendor &&
 193                                             device == ids[i].device)
 194                                         {
 195                                                 if (index <= 0)
 196                                                         return bdf;
 197
 198                                                 index--;
 199                                         }
 200                         }
 201         }
 202
 203         return (-1);
 204 }
 205 #endif  /* CONFIG_IXP425 */
 206
 207 pci_dev_t pci_find_device(unsigned int vendor, unsigned int device, int index)
 208 {
 209         static struct pci_device_id ids[2] = {{}, {0, 0}};
 210
 211         ids[0].vendor = vendor;
 212         ids[0].device = device;
 213
 214         return pci_find_devices(ids, index);
 215 }
 216
 217 /*
 218  *
 219  */
 220
 221 unsigned long pci_hose_phys_to_bus (struct pci_controller *hose,
 222                                     unsigned long phys_addr,
 223                                     unsigned long flags)
 224 {
 225         struct pci_region *res;
 226         unsigned long bus_addr;
 227         int i;
 228
 229         if (!hose) {
 230                 printf ("pci_hose_phys_to_bus: %s\n", "invalid hose");
 231                 goto Done;
 232         }
 233
 234         for (i = 0; i < hose->region_count; i++) {
 235                 res = &hose->regions[i];
 236
 237                 if (((res->flags ^ flags) & PCI_REGION_TYPE) != 0)
 238                         continue;
 239
 240                 bus_addr = phys_addr - res->phys_start + res->bus_start;
 241
 242                 if (bus_addr >= res->bus_start &&
 243                         bus_addr < res->bus_start + res->size) {
 244                         return bus_addr;
 245                 }
 246         }
 247
 248         printf ("pci_hose_phys_to_bus: %s\n", "invalid physical address");
 249
 250 Done:
 251         return 0;
 252 }
 253
 254 unsigned long pci_hose_bus_to_phys(struct pci_controller* hose,
 255                                    unsigned long bus_addr,
 256                                    unsigned long flags)
 257 {
 258         struct pci_region *res;
 259         int i;
 260
 261         if (!hose) {
 262                 printf ("pci_hose_bus_to_phys: %s\n", "invalid hose");
 263                 goto Done;
 264         }
 265
 266         for (i = 0; i < hose->region_count; i++) {
 267                 res = &hose->regions[i];
 268
 269                 if (((res->flags ^ flags) & PCI_REGION_TYPE) != 0)
 270                         continue;
 271
 272                 if (bus_addr >= res->bus_start &&
 273                         bus_addr < res->bus_start + res->size) {
 274                         return bus_addr - res->bus_start + res->phys_start;
 275                 }
 276         }
 277
 278         printf ("pci_hose_bus_to_phys: %s\n", "invalid physical address");
 279
 280 Done:
 281         return 0;
 282 }
 283
 284 /*
 285  *
 286  */
 287
 288 int pci_hose_config_device(struct pci_controller *hose,
 289                            pci_dev_t dev,
 290                            unsigned long io,
 291                            unsigned long mem,
 292                            unsigned long command)
 293 {
 294         unsigned int bar_response, bar_size, bar_value, old_command;
 295         unsigned char pin;
 296         int bar, found_mem64;
 297
 298         debug ("PCI Config: I/O=0x%lx, Memory=0x%lx, Command=0x%lx\n",
 299                 io, mem, command);
 300
 301         pci_hose_write_config_dword (hose, dev, PCI_COMMAND, 0);
 302
 303         for (bar = PCI_BASE_ADDRESS_0; bar < PCI_BASE_ADDRESS_5; bar += 4) {
 304                 pci_hose_write_config_dword (hose, dev, bar, 0xffffffff);
 305                 pci_hose_read_config_dword (hose, dev, bar, &bar_response);
 306
 307                 if (!bar_response)
 308                         continue;
 309
 310                 found_mem64 = 0;
 311
 312                 /* Check the BAR type and set our address mask */
 313                 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
 314                         bar_size = ~(bar_response & PCI_BASE_ADDRESS_IO_MASK) + 1;
 315                         /* round up region base address to a multiple of size */
 316                         io = ((io - 1) | (bar_size - 1)) + 1;
 317                         bar_value = io;
 318                         /* compute new region base address */
 319                         io = io + bar_size;
 320                 } else {
 321                         if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
 322                                 PCI_BASE_ADDRESS_MEM_TYPE_64)
 323                                 found_mem64 = 1;
 324
 325                         bar_size = ~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1;
 326
 327                         /* round up region base address to multiple of size */
 328                         mem = ((mem - 1) | (bar_size - 1)) + 1;
 329                         bar_value = mem;
 330                         /* compute new region base address */
 331                         mem = mem + bar_size;
 332                 }
 333
 334                 /* Write it out and update our limit */
 335                 pci_hose_write_config_dword (hose, dev, bar, bar_value);
 336
 337                 if (found_mem64) {
 338                         bar += 4;
 339                         pci_hose_write_config_dword (hose, dev, bar, 0x00000000);
 340                 }
 341         }
 342
 343         /* Configure Cache Line Size Register */
 344         pci_hose_write_config_byte (hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
 345
 346         /* Configure Latency Timer */
 347         pci_hose_write_config_byte (hose, dev, PCI_LATENCY_TIMER, 0x80);
 348
 349         /* Disable interrupt line, if device says it wants to use interrupts */
 350         pci_hose_read_config_byte (hose, dev, PCI_INTERRUPT_PIN, &pin);
 351         if (pin != 0) {
 352                 pci_hose_write_config_byte (hose, dev, PCI_INTERRUPT_LINE, 0xff);
 353         }
 354
 355         pci_hose_read_config_dword (hose, dev, PCI_COMMAND, &old_command);
 356         pci_hose_write_config_dword (hose, dev, PCI_COMMAND,
 357                                      (old_command & 0xffff0000) | command);
 358
 359         return 0;
 360 }
 361
 362 /*
 363  *
 364  */
 365
 366 struct pci_config_table *pci_find_config(struct pci_controller *hose,
 367                                          unsigned short class,
 368                                          unsigned int vendor,
 369                                          unsigned int device,
 370                                          unsigned int bus,
 371                                          unsigned int dev,
 372                                          unsigned int func)
 373 {
 374         struct pci_config_table *table;
 375
 376         for (table = hose->config_table; table && table->vendor; table++) {
 377                 if ((table->vendor == PCI_ANY_ID || table->vendor == vendor) &&
 378                     (table->device == PCI_ANY_ID || table->device == device) &&
 379                     (table->class  == PCI_ANY_ID || table->class  == class)  &&
 380                     (table->bus    == PCI_ANY_ID || table->bus    == bus)    &&
 381                     (table->dev    == PCI_ANY_ID || table->dev    == dev)    &&
 382                     (table->func   == PCI_ANY_ID || table->func   == func)) {
 383                         return table;
 384                 }
 385         }
 386
 387         return NULL;
 388 }
 389
 390 void pci_cfgfunc_config_device(struct pci_controller *hose,
 391                                pci_dev_t dev,
 392                                struct pci_config_table *entry)
 393 {
 394         pci_hose_config_device(hose, dev, entry->priv[0], entry->priv[1], entry->priv[2]);
 395 }
 396
 397 void pci_cfgfunc_do_nothing(struct pci_controller *hose,
 398                             pci_dev_t dev, struct pci_config_table *entry)
 399 {
 400 }
 401
 402 /*
 403  *
 404  */
 405
 406 /* HJF: Changed this to return int. I think this is required
 407  * to get the correct result when scanning bridges
 408  */
 409 extern int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev);
 410 extern void pciauto_config_init(struct pci_controller *hose);
 411
 412 int pci_hose_scan_bus(struct pci_controller *hose, int bus)
 413 {
 414         unsigned int sub_bus, found_multi=0;
 415         unsigned short vendor, device, class;
 416         unsigned char header_type;
 417         struct pci_config_table *cfg;
 418         pci_dev_t dev;
 419
 420         sub_bus = bus;
 421
 422         for (dev =  PCI_BDF(bus,0,0);
 423              dev <  PCI_BDF(bus,PCI_MAX_PCI_DEVICES-1,PCI_MAX_PCI_FUNCTIONS-1);
 424              dev += PCI_BDF(0,0,1))
 425         {
 426                 /* Skip our host bridge */
 427                 if ( dev == PCI_BDF(hose->first_busno,0,0) ) {
 428 #if defined(CONFIG_PCI_CONFIG_HOST_BRIDGE)              /* don't skip host bridge */
 429                         /*
 430                          * Only skip hostbridge configuration if "pciconfighost" is not set
 431                          */
 432                         if (getenv("pciconfighost") == NULL) {
 433                                 continue; /* Skip our host bridge */
 434                         }
 435 #else
 436                         continue; /* Skip our host bridge */
 437 #endif
 438                 }
 439
 440                 if (PCI_FUNC(dev) && !found_multi)
 441                         continue;
 442
 443                 pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type);
 444
 445                 pci_hose_read_config_word(hose, dev, PCI_VENDOR_ID, &vendor);
 446
 447                 if (vendor != 0xffff && vendor != 0x0000) {
 448
 449                         if (!PCI_FUNC(dev))
 450                                 found_multi = header_type & 0x80;
 451
 452                         debug ("PCI Scan: Found Bus %d, Device %d, Function %d\n",
 453                                 PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev) );
 454
 455                         pci_hose_read_config_word(hose, dev, PCI_DEVICE_ID, &device);
 456                         pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 457
 458                         cfg = pci_find_config(hose, class, vendor, device,
 459                                               PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
 460                         if (cfg) {
 461                                 cfg->config_device(hose, dev, cfg);
 462 #ifdef CONFIG_PCI_PNP
 463                         } else {
 464                                 int n = pciauto_config_device(hose, dev);
 465
 466                                 sub_bus = max(sub_bus, n);
 467 #endif
 468                         }
 469                         if (hose->fixup_irq)
 470                                 hose->fixup_irq(hose, dev);
 471
 472 #ifdef CONFIG_PCI_SCAN_SHOW
 473                         /* Skip our host bridge */
 474                         if ( dev != PCI_BDF(hose->first_busno,0,0) ) {
 475                             unsigned char int_line;
 476
 477                             pci_hose_read_config_byte(hose, dev, PCI_INTERRUPT_LINE,
 478                                                       &int_line);
 479                             printf("        %02x  %02x  %04x  %04x  %04x  %02x\n",
 480                                    PCI_BUS(dev), PCI_DEV(dev), vendor, device, class,
 481                                    int_line);
 482                         }
 483 #endif
 484                 }
 485         }
 486
 487         return sub_bus;
 488 }
 489
 490 int pci_hose_scan(struct pci_controller *hose)
 491 {
 492 #ifdef CONFIG_PCI_PNP
 493         pciauto_config_init(hose);
 494 #endif
 495         return pci_hose_scan_bus(hose, hose->first_busno);
 496 }
 497
 498 void pci_init(void)
 499 {
 500 #if defined(CONFIG_PCI_BOOTDELAY)
 501         char *s;
 502         int i;
 503
 504         /* wait "pcidelay" ms (if defined)... */
 505         s = getenv ("pcidelay");
 506         if (s) {
 507                 int val = simple_strtoul (s, NULL, 10);
 508                 for (i=0; i<val; i++)
 509                         udelay (1000);
 510         }
 511 #endif /* CONFIG_PCI_BOOTDELAY */
 512
 513         /* now call board specific pci_init()... */
 514         pci_init_board();
 515 }
 516
 517 #endif /* CONFIG_PCI */