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