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 static int pci_bf_sort;
  24 int pci_routeirq;
  25 int noioapicquirk;
  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 (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 (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 /*
 126  *  Called after each bus is probed, but before its children
 127  *  are examined.
 128  */
 129
 130 void __devinit  pcibios_fixup_bus(struct pci_bus *b)
 131 {
 132         pci_read_bridge_bases(b);
 133 }
 134
 135 /*
 136  * Only use DMI information to set this if nothing was passed
 137  * on the kernel command line (which was parsed earlier).
 138  */
 139
 140 static int __devinit set_bf_sort(const struct dmi_system_id *d)
 141 {
 142         if (pci_bf_sort == pci_bf_sort_default) {
 143                 pci_bf_sort = pci_dmi_bf;
 144                 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
 145         }
 146         return 0;
 147 }
 148
 149 /*
 150  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
 151  */
 152 #ifdef __i386__
 153 static int __devinit assign_all_busses(const struct dmi_system_id *d)
 154 {
 155         pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 156         printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
 157                         " (pci=assign-busses)\n", d->ident);
 158         return 0;
 159 }
 160 #endif
 161
 162 static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
 163 #ifdef __i386__
 164 /*
 165  * Laptops which need pci=assign-busses to see Cardbus cards
 166  */
 167         {
 168                 .callback = assign_all_busses,
 169                 .ident = "Samsung X20 Laptop",
 170                 .matches = {
 171                         DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
 172                         DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
 173                 },
 174         },
 175 #endif          /* __i386__ */
 176         {
 177                 .callback = set_bf_sort,
 178                 .ident = "Dell PowerEdge 1950",
 179                 .matches = {
 180                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 181                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
 182                 },
 183         },
 184         {
 185                 .callback = set_bf_sort,
 186                 .ident = "Dell PowerEdge 1955",
 187                 .matches = {
 188                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 189                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
 190                 },
 191         },
 192         {
 193                 .callback = set_bf_sort,
 194                 .ident = "Dell PowerEdge 2900",
 195                 .matches = {
 196                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 197                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
 198                 },
 199         },
 200         {
 201                 .callback = set_bf_sort,
 202                 .ident = "Dell PowerEdge 2950",
 203                 .matches = {
 204                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 205                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
 206                 },
 207         },
 208         {
 209                 .callback = set_bf_sort,
 210                 .ident = "Dell PowerEdge R900",
 211                 .matches = {
 212                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 213                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
 214                 },
 215         },
 216         {
 217                 .callback = set_bf_sort,
 218                 .ident = "HP ProLiant BL20p G3",
 219                 .matches = {
 220                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 221                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
 222                 },
 223         },
 224         {
 225                 .callback = set_bf_sort,
 226                 .ident = "HP ProLiant BL20p G4",
 227                 .matches = {
 228                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 229                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
 230                 },
 231         },
 232         {
 233                 .callback = set_bf_sort,
 234                 .ident = "HP ProLiant BL30p G1",
 235                 .matches = {
 236                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 237                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
 238                 },
 239         },
 240         {
 241                 .callback = set_bf_sort,
 242                 .ident = "HP ProLiant BL25p G1",
 243                 .matches = {
 244                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 245                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
 246                 },
 247         },
 248         {
 249                 .callback = set_bf_sort,
 250                 .ident = "HP ProLiant BL35p G1",
 251                 .matches = {
 252                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 253                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
 254                 },
 255         },
 256         {
 257                 .callback = set_bf_sort,
 258                 .ident = "HP ProLiant BL45p G1",
 259                 .matches = {
 260                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 261                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
 262                 },
 263         },
 264         {
 265                 .callback = set_bf_sort,
 266                 .ident = "HP ProLiant BL45p G2",
 267                 .matches = {
 268                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 269                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
 270                 },
 271         },
 272         {
 273                 .callback = set_bf_sort,
 274                 .ident = "HP ProLiant BL460c G1",
 275                 .matches = {
 276                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 277                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
 278                 },
 279         },
 280         {
 281                 .callback = set_bf_sort,
 282                 .ident = "HP ProLiant BL465c G1",
 283                 .matches = {
 284                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 285                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
 286                 },
 287         },
 288         {
 289                 .callback = set_bf_sort,
 290                 .ident = "HP ProLiant BL480c G1",
 291                 .matches = {
 292                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 293                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
 294                 },
 295         },
 296         {
 297                 .callback = set_bf_sort,
 298                 .ident = "HP ProLiant BL685c G1",
 299                 .matches = {
 300                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 301                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
 302                 },
 303         },
 304         {
 305                 .callback = set_bf_sort,
 306                 .ident = "HP ProLiant DL360",
 307                 .matches = {
 308                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 309                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
 310                 },
 311         },
 312         {
 313                 .callback = set_bf_sort,
 314                 .ident = "HP ProLiant DL380",
 315                 .matches = {
 316                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 317                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
 318                 },
 319         },
 320 #ifdef __i386__
 321         {
 322                 .callback = assign_all_busses,
 323                 .ident = "Compaq EVO N800c",
 324                 .matches = {
 325                         DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 326                         DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
 327                 },
 328         },
 329 #endif
 330         {
 331                 .callback = set_bf_sort,
 332                 .ident = "HP ProLiant DL360",
 333                 .matches = {
 334                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 335                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
 336                 },
 337         },
 338         {
 339                 .callback = set_bf_sort,
 340                 .ident = "HP ProLiant DL380",
 341                 .matches = {
 342                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 343                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
 344                 },
 345         },
 346         {}
 347 };
 348
 349 void __init dmi_check_pciprobe(void)
 350 {
 351         dmi_check_system(pciprobe_dmi_table);
 352 }
 353
 354 struct pci_bus * __devinit pcibios_scan_root(int busnum)
 355 {
 356         struct pci_bus *bus = NULL;
 357         struct pci_sysdata *sd;
 358
 359         while ((bus = pci_find_next_bus(bus)) != NULL) {
 360                 if (bus->number == busnum) {
 361                         /* Already scanned */
 362                         return bus;
 363                 }
 364         }
 365
 366         /* Allocate per-root-bus (not per bus) arch-specific data.
 367          * TODO: leak; this memory is never freed.
 368          * It's arguable whether it's worth the trouble to care.
 369          */
 370         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 371         if (!sd) {
 372                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
 373                 return NULL;
 374         }
 375
 376         sd->node = get_mp_bus_to_node(busnum);
 377
 378         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
 379         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
 380         if (!bus)
 381                 kfree(sd);
 382
 383         return bus;
 384 }
 385
 386 extern u8 pci_cache_line_size;
 387
 388 static int __init pcibios_init(void)
 389 {
 390         struct cpuinfo_x86 *c = &boot_cpu_data;
 391
 392         if (!raw_pci_ops) {
 393                 printk(KERN_WARNING "PCI: System does not support PCI\n");
 394                 return 0;
 395         }
 396
 397         /*
 398          * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
 399          * and P4. It's also good for 386/486s (which actually have 16)
 400          * as quite a few PCI devices do not support smaller values.
 401          */
 402         pci_cache_line_size = 32 >> 2;
 403         if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
 404                 pci_cache_line_size = 64 >> 2;  /* K7 & K8 */
 405         else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
 406                 pci_cache_line_size = 128 >> 2; /* P4 */
 407
 408         pcibios_resource_survey();
 409
 410         if (pci_bf_sort >= pci_force_bf)
 411                 pci_sort_breadthfirst();
 412         return 0;
 413 }
 414
 415 subsys_initcall(pcibios_init);
 416
 417 char * __devinit  pcibios_setup(char *str)
 418 {
 419         if (!strcmp(str, "off")) {
 420                 pci_probe = 0;
 421                 return NULL;
 422         } else if (!strcmp(str, "bfsort")) {
 423                 pci_bf_sort = pci_force_bf;
 424                 return NULL;
 425         } else if (!strcmp(str, "nobfsort")) {
 426                 pci_bf_sort = pci_force_nobf;
 427                 return NULL;
 428         }
 429 #ifdef CONFIG_PCI_BIOS
 430         else if (!strcmp(str, "bios")) {
 431                 pci_probe = PCI_PROBE_BIOS;
 432                 return NULL;
 433         } else if (!strcmp(str, "nobios")) {
 434                 pci_probe &= ~PCI_PROBE_BIOS;
 435                 return NULL;
 436         } else if (!strcmp(str, "biosirq")) {
 437                 pci_probe |= PCI_BIOS_IRQ_SCAN;
 438                 return NULL;
 439         } else if (!strncmp(str, "pirqaddr=", 9)) {
 440                 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
 441                 return NULL;
 442         }
 443 #endif
 444 #ifdef CONFIG_PCI_DIRECT
 445         else if (!strcmp(str, "conf1")) {
 446                 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
 447                 return NULL;
 448         }
 449         else if (!strcmp(str, "conf2")) {
 450                 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
 451                 return NULL;
 452         }
 453 #endif
 454 #ifdef CONFIG_PCI_MMCONFIG
 455         else if (!strcmp(str, "nommconf")) {
 456                 pci_probe &= ~PCI_PROBE_MMCONF;
 457                 return NULL;
 458         }
 459         else if (!strcmp(str, "check_enable_amd_mmconf")) {
 460                 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
 461                 return NULL;
 462         }
 463 #endif
 464         else if (!strcmp(str, "noacpi")) {
 465                 acpi_noirq_set();
 466                 return NULL;
 467         }
 468         else if (!strcmp(str, "noearly")) {
 469                 pci_probe |= PCI_PROBE_NOEARLY;
 470                 return NULL;
 471         }
 472 #ifndef CONFIG_X86_VISWS
 473         else if (!strcmp(str, "usepirqmask")) {
 474                 pci_probe |= PCI_USE_PIRQ_MASK;
 475                 return NULL;
 476         } else if (!strncmp(str, "irqmask=", 8)) {
 477                 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
 478                 return NULL;
 479         } else if (!strncmp(str, "lastbus=", 8)) {
 480                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 481                 return NULL;
 482         }
 483 #endif
 484         else if (!strcmp(str, "rom")) {
 485                 pci_probe |= PCI_ASSIGN_ROMS;
 486                 return NULL;
 487         } else if (!strcmp(str, "assign-busses")) {
 488                 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 489                 return NULL;
 490         } else if (!strcmp(str, "use_crs")) {
 491                 pci_probe |= PCI_USE__CRS;
 492                 return NULL;
 493         } else if (!strcmp(str, "routeirq")) {
 494                 pci_routeirq = 1;
 495                 return NULL;
 496         } else if (!strcmp(str, "skip_isa_align")) {
 497                 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
 498                 return NULL;
 499         } else if (!strcmp(str, "noioapicquirk")) {
 500                 noioapicquirk = 1;
 501                 return NULL;
 502         }
 503         return str;
 504 }
 505
 506 unsigned int pcibios_assign_all_busses(void)
 507 {
 508         return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 509 }
 510
 511 int pcibios_enable_device(struct pci_dev *dev, int mask)
 512 {
 513         int err;
 514
 515         if ((err = pci_enable_resources(dev, mask)) < 0)
 516                 return err;
 517
 518         if (!dev->msi_enabled)
 519                 return pcibios_enable_irq(dev);
 520         return 0;
 521 }
 522
 523 void pcibios_disable_device (struct pci_dev *dev)
 524 {
 525         if (!dev->msi_enabled && pcibios_disable_irq)
 526                 pcibios_disable_irq(dev);
 527 }
 528
 529 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 530 {
 531         struct pci_bus *bus = NULL;
 532         struct pci_sysdata *sd;
 533
 534         /*
 535          * Allocate per-root-bus (not per bus) arch-specific data.
 536          * TODO: leak; this memory is never freed.
 537          * It's arguable whether it's worth the trouble to care.
 538          */
 539         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 540         if (!sd) {
 541                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
 542                 return NULL;
 543         }
 544         sd->node = node;
 545         bus = pci_scan_bus(busno, ops, sd);
 546         if (!bus)
 547                 kfree(sd);
 548
 549         return bus;
 550 }
 551
 552 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
 553 {
 554         return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
 555 }