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