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