arch/x86/pci/common.c

   1 /*
   2  *      Low-Level PCI Support for PC
   3  *
   4  *      (c) 1999--2000 Martin Mares <mj@ucw.cz>
   5  */
   6
   7 #include <linux/sched.h>
   8 #include <linux/pci.h>
   9 #include <linux/ioport.h>
  10 #include <linux/init.h>
  11 #include <linux/dmi.h>
  12
  13 #include <asm/acpi.h>
  14 #include <asm/segment.h>
  15 #include <asm/io.h>
  16 #include <asm/smp.h>
  17
  18 #include "pci.h"
  19
  20 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
  21                                 PCI_PROBE_MMCONF;
  22
  23 unsigned int pci_early_dump_regs;
  24 static int pci_bf_sort;
  25 int pci_routeirq;
  26 int pcibios_last_bus = -1;
  27 unsigned long pirq_table_addr;
  28 struct pci_bus *pci_root_bus;
  29 struct pci_raw_ops *raw_pci_ops;
  30 struct pci_raw_ops *raw_pci_ext_ops;
  31
  32 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
  33                                                 int reg, int len, u32 *val)
  34 {
  35         if (domain == 0 && reg < 256 && raw_pci_ops)
  36                 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
  37         if (raw_pci_ext_ops)
  38                 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
  39         return -EINVAL;
  40 }
  41
  42 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
  43                                                 int reg, int len, u32 val)
  44 {
  45         if (domain == 0 && reg < 256 && raw_pci_ops)
  46                 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
  47         if (raw_pci_ext_ops)
  48                 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
  49         return -EINVAL;
  50 }
  51
  52 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
  53 {
  54         return raw_pci_read(pci_domain_nr(bus), bus->number,
  55                                  devfn, where, size, value);
  56 }
  57
  58 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
  59 {
  60         return raw_pci_write(pci_domain_nr(bus), bus->number,
  61                                   devfn, where, size, value);
  62 }
  63
  64 struct pci_ops pci_root_ops = {
  65         .read = pci_read,
  66         .write = pci_write,
  67 };
  68
  69 /*
  70  * legacy, numa, and acpi all want to call pcibios_scan_root
  71  * from their initcalls. This flag prevents that.
  72  */
  73 int pcibios_scanned;
  74
  75 /*
  76  * This interrupt-safe spinlock protects all accesses to PCI
  77  * configuration space.
  78  */
  79 DEFINE_SPINLOCK(pci_config_lock);
  80
  81 static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
  82 {
  83         pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
  84         printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
  85         return 0;
  86 }
  87
  88 static struct dmi_system_id can_skip_pciprobe_dmi_table[] __devinitdata = {
  89 /*
  90  * Systems where PCI IO resource ISA alignment can be skipped
  91  * when the ISA enable bit in the bridge control is not set
  92  */
  93         {
  94                 .callback = can_skip_ioresource_align,
  95                 .ident = "IBM System x3800",
  96                 .matches = {
  97                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  98                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  99                 },
 100         },
 101         {
 102                 .callback = can_skip_ioresource_align,
 103                 .ident = "IBM System x3850",
 104                 .matches = {
 105                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 106                         DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
 107                 },
 108         },
 109         {
 110                 .callback = can_skip_ioresource_align,
 111                 .ident = "IBM System x3950",
 112                 .matches = {
 113                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 114                         DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
 115                 },
 116         },
 117         {}
 118 };
 119
 120 void __init dmi_check_skip_isa_align(void)
 121 {
 122         dmi_check_system(can_skip_pciprobe_dmi_table);
 123 }
 124
 125 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
 126 {
 127         struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
 128
 129         if (pci_probe & PCI_NOASSIGN_ROMS) {
 130                 if (rom_r->parent)
 131                         return;
 132                 if (rom_r->start) {
 133                         /* we deal with BIOS assigned ROM later */
 134                         return;
 135                 }
 136                 rom_r->start = rom_r->end = rom_r->flags = 0;
 137         }
 138 }
 139
 140 /*
 141  *  Called after each bus is probed, but before its children
 142  *  are examined.
 143  */
 144
 145 void __devinit  pcibios_fixup_bus(struct pci_bus *b)
 146 {
 147         struct pci_dev *dev;
 148
 149         pci_read_bridge_bases(b);
 150         list_for_each_entry(dev, &b->devices, bus_list)
 151                 pcibios_fixup_device_resources(dev);
 152 }
 153
 154 /*
 155  * Only use DMI information to set this if nothing was passed
 156  * on the kernel command line (which was parsed earlier).
 157  */
 158
 159 static int __devinit set_bf_sort(const struct dmi_system_id *d)
 160 {
 161         if (pci_bf_sort == pci_bf_sort_default) {
 162                 pci_bf_sort = pci_dmi_bf;
 163                 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
 164         }
 165         return 0;
 166 }
 167
 168 /*
 169  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
 170  */
 171 #ifdef __i386__
 172 static int __devinit assign_all_busses(const struct dmi_system_id *d)
 173 {
 174         pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 175         printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
 176                         " (pci=assign-busses)\n", d->ident);
 177         return 0;
 178 }
 179 #endif
 180
 181 static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
 182 #ifdef __i386__
 183 /*
 184  * Laptops which need pci=assign-busses to see Cardbus cards
 185  */
 186         {
 187                 .callback = assign_all_busses,
 188                 .ident = "Samsung X20 Laptop",
 189                 .matches = {
 190                         DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
 191                         DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
 192                 },
 193         },
 194 #endif          /* __i386__ */
 195         {
 196                 .callback = set_bf_sort,
 197                 .ident = "Dell PowerEdge 1950",
 198                 .matches = {
 199                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 200                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
 201                 },
 202         },
 203         {
 204                 .callback = set_bf_sort,
 205                 .ident = "Dell PowerEdge 1955",
 206                 .matches = {
 207                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 208                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
 209                 },
 210         },
 211         {
 212                 .callback = set_bf_sort,
 213                 .ident = "Dell PowerEdge 2900",
 214                 .matches = {
 215                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 216                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
 217                 },
 218         },
 219         {
 220                 .callback = set_bf_sort,
 221                 .ident = "Dell PowerEdge 2950",
 222                 .matches = {
 223                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 224                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
 225                 },
 226         },
 227         {
 228                 .callback = set_bf_sort,
 229                 .ident = "Dell PowerEdge R900",
 230                 .matches = {
 231                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 232                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
 233                 },
 234         },
 235         {
 236                 .callback = set_bf_sort,
 237                 .ident = "HP ProLiant BL20p G3",
 238                 .matches = {
 239                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 240                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
 241                 },
 242         },
 243         {
 244                 .callback = set_bf_sort,
 245                 .ident = "HP ProLiant BL20p G4",
 246                 .matches = {
 247                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 248                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
 249                 },
 250         },
 251         {
 252                 .callback = set_bf_sort,
 253                 .ident = "HP ProLiant BL30p G1",
 254                 .matches = {
 255                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 256                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
 257                 },
 258         },
 259         {
 260                 .callback = set_bf_sort,
 261                 .ident = "HP ProLiant BL25p G1",
 262                 .matches = {
 263                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 264                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
 265                 },
 266         },
 267         {
 268                 .callback = set_bf_sort,
 269                 .ident = "HP ProLiant BL35p G1",
 270                 .matches = {
 271                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 272                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
 273                 },
 274         },
 275         {
 276                 .callback = set_bf_sort,
 277                 .ident = "HP ProLiant BL45p G1",
 278                 .matches = {
 279                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 280                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
 281                 },
 282         },
 283         {
 284                 .callback = set_bf_sort,
 285                 .ident = "HP ProLiant BL45p G2",
 286                 .matches = {
 287                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 288                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
 289                 },
 290         },
 291         {
 292                 .callback = set_bf_sort,
 293                 .ident = "HP ProLiant BL460c G1",
 294                 .matches = {
 295                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 296                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
 297                 },
 298         },
 299         {
 300                 .callback = set_bf_sort,
 301                 .ident = "HP ProLiant BL465c G1",
 302                 .matches = {
 303                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 304                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
 305                 },
 306         },
 307         {
 308                 .callback = set_bf_sort,
 309                 .ident = "HP ProLiant BL480c G1",
 310                 .matches = {
 311                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 312                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
 313                 },
 314         },
 315         {
 316                 .callback = set_bf_sort,
 317                 .ident = "HP ProLiant BL685c G1",
 318                 .matches = {
 319                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 320                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
 321                 },
 322         },
 323         {
 324                 .callback = set_bf_sort,
 325                 .ident = "HP ProLiant DL360",
 326                 .matches = {
 327                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 328                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
 329                 },
 330         },
 331         {
 332                 .callback = set_bf_sort,
 333                 .ident = "HP ProLiant DL380",
 334                 .matches = {
 335                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 336                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
 337                 },
 338         },
 339 #ifdef __i386__
 340         {
 341                 .callback = assign_all_busses,
 342                 .ident = "Compaq EVO N800c",
 343                 .matches = {
 344                         DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 345                         DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
 346                 },
 347         },
 348 #endif
 349         {
 350                 .callback = set_bf_sort,
 351                 .ident = "HP ProLiant DL385 G2",
 352                 .matches = {
 353                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 354                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
 355                 },
 356         },
 357         {
 358                 .callback = set_bf_sort,
 359                 .ident = "HP ProLiant DL585 G2",
 360                 .matches = {
 361                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 362                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
 363                 },
 364         },
 365         {}
 366 };
 367
 368 void __init dmi_check_pciprobe(void)
 369 {
 370         dmi_check_system(pciprobe_dmi_table);
 371 }
 372
 373 struct pci_bus * __devinit pcibios_scan_root(int busnum)
 374 {
 375         struct pci_bus *bus = NULL;
 376         struct pci_sysdata *sd;
 377
 378         while ((bus = pci_find_next_bus(bus)) != NULL) {
 379                 if (bus->number == busnum) {
 380                         /* Already scanned */
 381                         return bus;
 382                 }
 383         }
 384
 385         /* Allocate per-root-bus (not per bus) arch-specific data.
 386          * TODO: leak; this memory is never freed.
 387          * It's arguable whether it's worth the trouble to care.
 388          */
 389         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 390         if (!sd) {
 391                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
 392                 return NULL;
 393         }
 394
 395         sd->node = get_mp_bus_to_node(busnum);
 396
 397         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
 398         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
 399         if (!bus)
 400                 kfree(sd);
 401
 402         return bus;
 403 }
 404
 405 extern u8 pci_cache_line_size;
 406
 407 static int __init pcibios_init(void)
 408 {
 409         struct cpuinfo_x86 *c = &boot_cpu_data;
 410
 411         if (!raw_pci_ops) {
 412                 printk(KERN_WARNING "PCI: System does not support PCI\n");
 413                 return 0;
 414         }
 415
 416         /*
 417          * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
 418          * and P4. It's also good for 386/486s (which actually have 16)
 419          * as quite a few PCI devices do not support smaller values.
 420          */
 421         pci_cache_line_size = 32 >> 2;
 422         if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
 423                 pci_cache_line_size = 64 >> 2;  /* K7 & K8 */
 424         else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
 425                 pci_cache_line_size = 128 >> 2; /* P4 */
 426
 427         pcibios_resource_survey();
 428
 429         if (pci_bf_sort >= pci_force_bf)
 430                 pci_sort_breadthfirst();
 431         return 0;
 432 }
 433
 434 subsys_initcall(pcibios_init);
 435
 436 char * __devinit  pcibios_setup(char *str)
 437 {
 438         if (!strcmp(str, "off")) {
 439                 pci_probe = 0;
 440                 return NULL;
 441         } else if (!strcmp(str, "bfsort")) {
 442                 pci_bf_sort = pci_force_bf;
 443                 return NULL;
 444         } else if (!strcmp(str, "nobfsort")) {
 445                 pci_bf_sort = pci_force_nobf;
 446                 return NULL;
 447         }
 448 #ifdef CONFIG_PCI_BIOS
 449         else if (!strcmp(str, "bios")) {
 450                 pci_probe = PCI_PROBE_BIOS;
 451                 return NULL;
 452         } else if (!strcmp(str, "nobios")) {
 453                 pci_probe &= ~PCI_PROBE_BIOS;
 454                 return NULL;
 455         } else if (!strcmp(str, "biosirq")) {
 456                 pci_probe |= PCI_BIOS_IRQ_SCAN;
 457                 return NULL;
 458         } else if (!strncmp(str, "pirqaddr=", 9)) {
 459                 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
 460                 return NULL;
 461         }
 462 #endif
 463 #ifdef CONFIG_PCI_DIRECT
 464         else if (!strcmp(str, "conf1")) {
 465                 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
 466                 return NULL;
 467         }
 468         else if (!strcmp(str, "conf2")) {
 469                 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
 470                 return NULL;
 471         }
 472 #endif
 473 #ifdef CONFIG_PCI_MMCONFIG
 474         else if (!strcmp(str, "nommconf")) {
 475                 pci_probe &= ~PCI_PROBE_MMCONF;
 476                 return NULL;
 477         }
 478         else if (!strcmp(str, "check_enable_amd_mmconf")) {
 479                 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
 480                 return NULL;
 481         }
 482 #endif
 483         else if (!strcmp(str, "noacpi")) {
 484                 acpi_noirq_set();
 485                 return NULL;
 486         }
 487         else if (!strcmp(str, "noearly")) {
 488                 pci_probe |= PCI_PROBE_NOEARLY;
 489                 return NULL;
 490         }
 491 #ifndef CONFIG_X86_VISWS
 492         else if (!strcmp(str, "usepirqmask")) {
 493                 pci_probe |= PCI_USE_PIRQ_MASK;
 494                 return NULL;
 495         } else if (!strncmp(str, "irqmask=", 8)) {
 496                 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
 497                 return NULL;
 498         } else if (!strncmp(str, "lastbus=", 8)) {
 499                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 500                 return NULL;
 501         }
 502 #endif
 503         else if (!strcmp(str, "rom")) {
 504                 pci_probe |= PCI_ASSIGN_ROMS;
 505                 return NULL;
 506         } else if (!strcmp(str, "norom")) {
 507                 pci_probe |= PCI_NOASSIGN_ROMS;
 508                 return NULL;
 509         } else if (!strcmp(str, "assign-busses")) {
 510                 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 511                 return NULL;
 512         } else if (!strcmp(str, "use_crs")) {
 513                 pci_probe |= PCI_USE__CRS;
 514                 return NULL;
 515         } else if (!strcmp(str, "earlydump")) {
 516                 pci_early_dump_regs = 1;
 517                 return NULL;
 518         } else if (!strcmp(str, "routeirq")) {
 519                 pci_routeirq = 1;
 520                 return NULL;
 521         } else if (!strcmp(str, "skip_isa_align")) {
 522                 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
 523                 return NULL;
 524         }
 525         return str;
 526 }
 527
 528 unsigned int pcibios_assign_all_busses(void)
 529 {
 530         return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 531 }
 532
 533 int pcibios_enable_device(struct pci_dev *dev, int mask)
 534 {
 535         int err;
 536
 537         if ((err = pci_enable_resources(dev, mask)) < 0)
 538                 return err;
 539
 540         if (!dev->msi_enabled)
 541                 return pcibios_enable_irq(dev);
 542         return 0;
 543 }
 544
 545 void pcibios_disable_device (struct pci_dev *dev)
 546 {
 547         if (!dev->msi_enabled && pcibios_disable_irq)
 548                 pcibios_disable_irq(dev);
 549 }
 550
 551 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 552 {
 553         struct pci_bus *bus = NULL;
 554         struct pci_sysdata *sd;
 555
 556         /*
 557          * Allocate per-root-bus (not per bus) arch-specific data.
 558          * TODO: leak; this memory is never freed.
 559          * It's arguable whether it's worth the trouble to care.
 560          */
 561         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 562         if (!sd) {
 563                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
 564                 return NULL;
 565         }
 566         sd->node = node;
 567         bus = pci_scan_bus(busno, ops, sd);
 568         if (!bus)
 569                 kfree(sd);
 570
 571         return bus;
 572 }
 573
 574 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
 575 {
 576         return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
 577 }