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