arch/sparc/kernel/pci.c

   1 /* pci.c: UltraSparc PCI controller support.
   2  *
   3  * Copyright (C) 1997, 1998, 1999 David S. Miller (davem@redhat.com)
   4  * Copyright (C) 1998, 1999 Eddie C. Dost   (ecd@skynet.be)
   5  * Copyright (C) 1999 Jakub Jelinek   (jj@ultra.linux.cz)
   6  *
   7  * OF tree based PCI bus probing taken from the PowerPC port
   8  * with minor modifications, see there for credits.
   9  */
  10
  11 #include <linux/export.h>
  12 #include <linux/kernel.h>
  13 #include <linux/string.h>
  14 #include <linux/sched.h>
  15 #include <linux/capability.h>
  16 #include <linux/errno.h>
  17 #include <linux/pci.h>
  18 #include <linux/msi.h>
  19 #include <linux/irq.h>
  20 #include <linux/init.h>
  21 #include <linux/of.h>
  22 #include <linux/of_device.h>
  23
  24 #include <asm/uaccess.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/irq.h>
  27 #include <asm/prom.h>
  28 #include <asm/apb.h>
  29
  30 #include "pci_impl.h"
  31
  32 /* List of all PCI controllers found in the system. */
  33 struct pci_pbm_info *pci_pbm_root = NULL;
  34
  35 /* Each PBM found gets a unique index. */
  36 int pci_num_pbms = 0;
  37
  38 volatile int pci_poke_in_progress;
  39 volatile int pci_poke_cpu = -1;
  40 volatile int pci_poke_faulted;
  41
  42 static DEFINE_SPINLOCK(pci_poke_lock);
  43
  44 void pci_config_read8(u8 *addr, u8 *ret)
  45 {
  46         unsigned long flags;
  47         u8 byte;
  48
  49         spin_lock_irqsave(&pci_poke_lock, flags);
  50         pci_poke_cpu = smp_processor_id();
  51         pci_poke_in_progress = 1;
  52         pci_poke_faulted = 0;
  53         __asm__ __volatile__("membar #Sync\n\t"
  54                              "lduba [%1] %2, %0\n\t"
  55                              "membar #Sync"
  56                              : "=r" (byte)
  57                              : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
  58                              : "memory");
  59         pci_poke_in_progress = 0;
  60         pci_poke_cpu = -1;
  61         if (!pci_poke_faulted)
  62                 *ret = byte;
  63         spin_unlock_irqrestore(&pci_poke_lock, flags);
  64 }
  65
  66 void pci_config_read16(u16 *addr, u16 *ret)
  67 {
  68         unsigned long flags;
  69         u16 word;
  70
  71         spin_lock_irqsave(&pci_poke_lock, flags);
  72         pci_poke_cpu = smp_processor_id();
  73         pci_poke_in_progress = 1;
  74         pci_poke_faulted = 0;
  75         __asm__ __volatile__("membar #Sync\n\t"
  76                              "lduha [%1] %2, %0\n\t"
  77                              "membar #Sync"
  78                              : "=r" (word)
  79                              : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
  80                              : "memory");
  81         pci_poke_in_progress = 0;
  82         pci_poke_cpu = -1;
  83         if (!pci_poke_faulted)
  84                 *ret = word;
  85         spin_unlock_irqrestore(&pci_poke_lock, flags);
  86 }
  87
  88 void pci_config_read32(u32 *addr, u32 *ret)
  89 {
  90         unsigned long flags;
  91         u32 dword;
  92
  93         spin_lock_irqsave(&pci_poke_lock, flags);
  94         pci_poke_cpu = smp_processor_id();
  95         pci_poke_in_progress = 1;
  96         pci_poke_faulted = 0;
  97         __asm__ __volatile__("membar #Sync\n\t"
  98                              "lduwa [%1] %2, %0\n\t"
  99                              "membar #Sync"
 100                              : "=r" (dword)
 101                              : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
 102                              : "memory");
 103         pci_poke_in_progress = 0;
 104         pci_poke_cpu = -1;
 105         if (!pci_poke_faulted)
 106                 *ret = dword;
 107         spin_unlock_irqrestore(&pci_poke_lock, flags);
 108 }
 109
 110 void pci_config_write8(u8 *addr, u8 val)
 111 {
 112         unsigned long flags;
 113
 114         spin_lock_irqsave(&pci_poke_lock, flags);
 115         pci_poke_cpu = smp_processor_id();
 116         pci_poke_in_progress = 1;
 117         pci_poke_faulted = 0;
 118         __asm__ __volatile__("membar #Sync\n\t"
 119                              "stba %0, [%1] %2\n\t"
 120                              "membar #Sync"
 121                              : /* no outputs */
 122                              : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
 123                              : "memory");
 124         pci_poke_in_progress = 0;
 125         pci_poke_cpu = -1;
 126         spin_unlock_irqrestore(&pci_poke_lock, flags);
 127 }
 128
 129 void pci_config_write16(u16 *addr, u16 val)
 130 {
 131         unsigned long flags;
 132
 133         spin_lock_irqsave(&pci_poke_lock, flags);
 134         pci_poke_cpu = smp_processor_id();
 135         pci_poke_in_progress = 1;
 136         pci_poke_faulted = 0;
 137         __asm__ __volatile__("membar #Sync\n\t"
 138                              "stha %0, [%1] %2\n\t"
 139                              "membar #Sync"
 140                              : /* no outputs */
 141                              : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
 142                              : "memory");
 143         pci_poke_in_progress = 0;
 144         pci_poke_cpu = -1;
 145         spin_unlock_irqrestore(&pci_poke_lock, flags);
 146 }
 147
 148 void pci_config_write32(u32 *addr, u32 val)
 149 {
 150         unsigned long flags;
 151
 152         spin_lock_irqsave(&pci_poke_lock, flags);
 153         pci_poke_cpu = smp_processor_id();
 154         pci_poke_in_progress = 1;
 155         pci_poke_faulted = 0;
 156         __asm__ __volatile__("membar #Sync\n\t"
 157                              "stwa %0, [%1] %2\n\t"
 158                              "membar #Sync"
 159                              : /* no outputs */
 160                              : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
 161                              : "memory");
 162         pci_poke_in_progress = 0;
 163         pci_poke_cpu = -1;
 164         spin_unlock_irqrestore(&pci_poke_lock, flags);
 165 }
 166
 167 static int ofpci_verbose;
 168
 169 static int __init ofpci_debug(char *str)
 170 {
 171         int val = 0;
 172
 173         get_option(&str, &val);
 174         if (val)
 175                 ofpci_verbose = 1;
 176         return 1;
 177 }
 178
 179 __setup("ofpci_debug=", ofpci_debug);
 180
 181 static unsigned long pci_parse_of_flags(u32 addr0)
 182 {
 183         unsigned long flags = 0;
 184
 185         if (addr0 & 0x02000000) {
 186                 flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY;
 187                 flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64;
 188                 flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
 189                 if (addr0 & 0x40000000)
 190                         flags |= IORESOURCE_PREFETCH
 191                                  | PCI_BASE_ADDRESS_MEM_PREFETCH;
 192         } else if (addr0 & 0x01000000)
 193                 flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
 194         return flags;
 195 }
 196
 197 /* The of_device layer has translated all of the assigned-address properties
 198  * into physical address resources, we only have to figure out the register
 199  * mapping.
 200  */
 201 static void pci_parse_of_addrs(struct platform_device *op,
 202                                struct device_node *node,
 203                                struct pci_dev *dev)
 204 {
 205         struct resource *op_res;
 206         const u32 *addrs;
 207         int proplen;
 208
 209         addrs = of_get_property(node, "assigned-addresses", &proplen);
 210         if (!addrs)
 211                 return;
 212         if (ofpci_verbose)
 213                 printk("    parse addresses (%d bytes) @ %p\n",
 214                        proplen, addrs);
 215         op_res = &op->resource[0];
 216         for (; proplen >= 20; proplen -= 20, addrs += 5, op_res++) {
 217                 struct resource *res;
 218                 unsigned long flags;
 219                 int i;
 220
 221                 flags = pci_parse_of_flags(addrs[0]);
 222                 if (!flags)
 223                         continue;
 224                 i = addrs[0] & 0xff;
 225                 if (ofpci_verbose)
 226                         printk("  start: %llx, end: %llx, i: %x\n",
 227                                op_res->start, op_res->end, i);
 228
 229                 if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) {
 230                         res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];
 231                 } else if (i == dev->rom_base_reg) {
 232                         res = &dev->resource[PCI_ROM_RESOURCE];
 233                         flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE
 234                               | IORESOURCE_SIZEALIGN;
 235                 } else {
 236                         printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i);
 237                         continue;
 238                 }
 239                 res->start = op_res->start;
 240                 res->end = op_res->end;
 241                 res->flags = flags;
 242                 res->name = pci_name(dev);
 243         }
 244 }
 245
 246 static struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
 247                                          struct device_node *node,
 248                                          struct pci_bus *bus, int devfn)
 249 {
 250         struct dev_archdata *sd;
 251         struct pci_slot *slot;
 252         struct platform_device *op;
 253         struct pci_dev *dev;
 254         const char *type;
 255         u32 class;
 256
 257         dev = alloc_pci_dev();
 258         if (!dev)
 259                 return NULL;
 260
 261         sd = &dev->dev.archdata;
 262         sd->iommu = pbm->iommu;
 263         sd->stc = &pbm->stc;
 264         sd->host_controller = pbm;
 265         sd->op = op = of_find_device_by_node(node);
 266         sd->numa_node = pbm->numa_node;
 267
 268         sd = &op->dev.archdata;
 269         sd->iommu = pbm->iommu;
 270         sd->stc = &pbm->stc;
 271         sd->numa_node = pbm->numa_node;
 272
 273         if (!strcmp(node->name, "ebus"))
 274                 of_propagate_archdata(op);
 275
 276         type = of_get_property(node, "device_type", NULL);
 277         if (type == NULL)
 278                 type = "";
 279
 280         if (ofpci_verbose)
 281                 printk("    create device, devfn: %x, type: %s\n",
 282                        devfn, type);
 283
 284         dev->bus = bus;
 285         dev->sysdata = node;
 286         dev->dev.parent = bus->bridge;
 287         dev->dev.bus = &pci_bus_type;
 288         dev->dev.of_node = of_node_get(node);
 289         dev->devfn = devfn;
 290         dev->multifunction = 0;         /* maybe a lie? */
 291         set_pcie_port_type(dev);
 292
 293         list_for_each_entry(slot, &dev->bus->slots, list)
 294                 if (PCI_SLOT(dev->devfn) == slot->number)
 295                         dev->slot = slot;
 296
 297         dev->vendor = of_getintprop_default(node, "vendor-id", 0xffff);
 298         dev->device = of_getintprop_default(node, "device-id", 0xffff);
 299         dev->subsystem_vendor =
 300                 of_getintprop_default(node, "subsystem-vendor-id", 0);
 301         dev->subsystem_device =
 302                 of_getintprop_default(node, "subsystem-id", 0);
 303
 304         dev->cfg_size = pci_cfg_space_size(dev);
 305
 306         /* We can't actually use the firmware value, we have
 307          * to read what is in the register right now.  One
 308          * reason is that in the case of IDE interfaces the
 309          * firmware can sample the value before the the IDE
 310          * interface is programmed into native mode.
 311          */
 312         pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
 313         dev->class = class >> 8;
 314         dev->revision = class & 0xff;
 315
 316         dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus),
 317                 dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
 318
 319         if (ofpci_verbose)
 320                 printk("    class: 0x%x device name: %s\n",
 321                        dev->class, pci_name(dev));
 322
 323         /* I have seen IDE devices which will not respond to
 324          * the bmdma simplex check reads if bus mastering is
 325          * disabled.
 326          */
 327         if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
 328                 pci_set_master(dev);
 329
 330         dev->current_state = 4;         /* unknown power state */
 331         dev->error_state = pci_channel_io_normal;
 332         dev->dma_mask = 0xffffffff;
 333
 334         if (!strcmp(node->name, "pci")) {
 335                 /* a PCI-PCI bridge */
 336                 dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
 337                 dev->rom_base_reg = PCI_ROM_ADDRESS1;
 338         } else if (!strcmp(type, "cardbus")) {
 339                 dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
 340         } else {
 341                 dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
 342                 dev->rom_base_reg = PCI_ROM_ADDRESS;
 343
 344                 dev->irq = sd->op->archdata.irqs[0];
 345                 if (dev->irq == 0xffffffff)
 346                         dev->irq = PCI_IRQ_NONE;
 347         }
 348
 349         pci_parse_of_addrs(sd->op, node, dev);
 350
 351         if (ofpci_verbose)
 352                 printk("    adding to system ...\n");
 353
 354         pci_device_add(dev, bus);
 355
 356         return dev;
 357 }
 358
 359 static void apb_calc_first_last(u8 map, u32 *first_p, u32 *last_p)
 360 {
 361         u32 idx, first, last;
 362
 363         first = 8;
 364         last = 0;
 365         for (idx = 0; idx < 8; idx++) {
 366                 if ((map & (1 << idx)) != 0) {
 367                         if (first > idx)
 368                                 first = idx;
 369                         if (last < idx)
 370                                 last = idx;
 371                 }
 372         }
 373
 374         *first_p = first;
 375         *last_p = last;
 376 }
 377
 378 /* Cook up fake bus resources for SUNW,simba PCI bridges which lack
 379  * a proper 'ranges' property.
 380  */
 381 static void apb_fake_ranges(struct pci_dev *dev,
 382                             struct pci_bus *bus,
 383                             struct pci_pbm_info *pbm)
 384 {
 385         struct pci_bus_region region;
 386         struct resource *res;
 387         u32 first, last;
 388         u8 map;
 389
 390         pci_read_config_byte(dev, APB_IO_ADDRESS_MAP, &map);
 391         apb_calc_first_last(map, &first, &last);
 392         res = bus->resource[0];
 393         res->flags = IORESOURCE_IO;
 394         region.start = (first << 21);
 395         region.end = (last << 21) + ((1 << 21) - 1);
 396         pcibios_bus_to_resource(dev, res, &region);
 397
 398         pci_read_config_byte(dev, APB_MEM_ADDRESS_MAP, &map);
 399         apb_calc_first_last(map, &first, &last);
 400         res = bus->resource[1];
 401         res->flags = IORESOURCE_MEM;
 402         region.start = (first << 21);
 403         region.end = (last << 21) + ((1 << 21) - 1);
 404         pcibios_bus_to_resource(dev, res, &region);
 405 }
 406
 407 static void pci_of_scan_bus(struct pci_pbm_info *pbm,
 408                             struct device_node *node,
 409                             struct pci_bus *bus);
 410
 411 #define GET_64BIT(prop, i)      ((((u64) (prop)[(i)]) << 32) | (prop)[(i)+1])
 412
 413 static void of_scan_pci_bridge(struct pci_pbm_info *pbm,
 414                                struct device_node *node,
 415                                struct pci_dev *dev)
 416 {
 417         struct pci_bus *bus;
 418         const u32 *busrange, *ranges;
 419         int len, i, simba;
 420         struct pci_bus_region region;
 421         struct resource *res;
 422         unsigned int flags;
 423         u64 size;
 424
 425         if (ofpci_verbose)
 426                 printk("of_scan_pci_bridge(%s)\n", node->full_name);
 427
 428         /* parse bus-range property */
 429         busrange = of_get_property(node, "bus-range", &len);
 430         if (busrange == NULL || len != 8) {
 431                 printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %s\n",
 432                        node->full_name);
 433                 return;
 434         }
 435         ranges = of_get_property(node, "ranges", &len);
 436         simba = 0;
 437         if (ranges == NULL) {
 438                 const char *model = of_get_property(node, "model", NULL);
 439                 if (model && !strcmp(model, "SUNW,simba"))
 440                         simba = 1;
 441         }
 442
 443         bus = pci_add_new_bus(dev->bus, dev, busrange[0]);
 444         if (!bus) {
 445                 printk(KERN_ERR "Failed to create pci bus for %s\n",
 446                        node->full_name);
 447                 return;
 448         }
 449
 450         bus->primary = dev->bus->number;
 451         pci_bus_insert_busn_res(bus, busrange[0], busrange[1]);
 452         bus->bridge_ctl = 0;
 453
 454         /* parse ranges property, or cook one up by hand for Simba */
 455         /* PCI #address-cells == 3 and #size-cells == 2 always */
 456         res = &dev->resource[PCI_BRIDGE_RESOURCES];
 457         for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {
 458                 res->flags = 0;
 459                 bus->resource[i] = res;
 460                 ++res;
 461         }
 462         if (simba) {
 463                 apb_fake_ranges(dev, bus, pbm);
 464                 goto after_ranges;
 465         } else if (ranges == NULL) {
 466                 pci_read_bridge_bases(bus);
 467                 goto after_ranges;
 468         }
 469         i = 1;
 470         for (; len >= 32; len -= 32, ranges += 8) {
 471                 flags = pci_parse_of_flags(ranges[0]);
 472                 size = GET_64BIT(ranges, 6);
 473                 if (flags == 0 || size == 0)
 474                         continue;
 475                 if (flags & IORESOURCE_IO) {
 476                         res = bus->resource[0];
 477                         if (res->flags) {
 478                                 printk(KERN_ERR "PCI: ignoring extra I/O range"
 479                                        " for bridge %s\n", node->full_name);
 480                                 continue;
 481                         }
 482                 } else {
 483                         if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
 484                                 printk(KERN_ERR "PCI: too many memory ranges"
 485                                        " for bridge %s\n", node->full_name);
 486                                 continue;
 487                         }
 488                         res = bus->resource[i];
 489                         ++i;
 490                 }
 491
 492                 res->flags = flags;
 493                 region.start = GET_64BIT(ranges, 1);
 494                 region.end = region.start + size - 1;
 495                 pcibios_bus_to_resource(dev, res, &region);
 496         }
 497 after_ranges:
 498         sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
 499                 bus->number);
 500         if (ofpci_verbose)
 501                 printk("    bus name: %s\n", bus->name);
 502
 503         pci_of_scan_bus(pbm, node, bus);
 504 }
 505
 506 static void pci_of_scan_bus(struct pci_pbm_info *pbm,
 507                             struct device_node *node,
 508                             struct pci_bus *bus)
 509 {
 510         struct device_node *child;
 511         const u32 *reg;
 512         int reglen, devfn, prev_devfn;
 513         struct pci_dev *dev;
 514
 515         if (ofpci_verbose)
 516                 printk("PCI: scan_bus[%s] bus no %d\n",
 517                        node->full_name, bus->number);
 518
 519         child = NULL;
 520         prev_devfn = -1;
 521         while ((child = of_get_next_child(node, child)) != NULL) {
 522                 if (ofpci_verbose)
 523                         printk("  * %s\n", child->full_name);
 524                 reg = of_get_property(child, "reg", &reglen);
 525                 if (reg == NULL || reglen < 20)
 526                         continue;
 527
 528                 devfn = (reg[0] >> 8) & 0xff;
 529
 530                 /* This is a workaround for some device trees
 531                  * which list PCI devices twice.  On the V100
 532                  * for example, device number 3 is listed twice.
 533                  * Once as "pm" and once again as "lomp".
 534                  */
 535                 if (devfn == prev_devfn)
 536                         continue;
 537                 prev_devfn = devfn;
 538
 539                 /* create a new pci_dev for this device */
 540                 dev = of_create_pci_dev(pbm, child, bus, devfn);
 541                 if (!dev)
 542                         continue;
 543                 if (ofpci_verbose)
 544                         printk("PCI: dev header type: %x\n",
 545                                dev->hdr_type);
 546
 547                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
 548                     dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 549                         of_scan_pci_bridge(pbm, child, dev);
 550         }
 551 }
 552
 553 static ssize_t
 554 show_pciobppath_attr(struct device * dev, struct device_attribute * attr, char * buf)
 555 {
 556         struct pci_dev *pdev;
 557         struct device_node *dp;
 558
 559         pdev = to_pci_dev(dev);
 560         dp = pdev->dev.of_node;
 561
 562         return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
 563 }
 564
 565 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, show_pciobppath_attr, NULL);
 566
 567 static void pci_bus_register_of_sysfs(struct pci_bus *bus)
 568 {
 569         struct pci_dev *dev;
 570         struct pci_bus *child_bus;
 571         int err;
 572
 573         list_for_each_entry(dev, &bus->devices, bus_list) {
 574                 /* we don't really care if we can create this file or
 575                  * not, but we need to assign the result of the call
 576                  * or the world will fall under alien invasion and
 577                  * everybody will be frozen on a spaceship ready to be
 578                  * eaten on alpha centauri by some green and jelly
 579                  * humanoid.
 580                  */
 581                 err = sysfs_create_file(&dev->dev.kobj, &dev_attr_obppath.attr);
 582                 (void) err;
 583         }
 584         list_for_each_entry(child_bus, &bus->children, node)
 585                 pci_bus_register_of_sysfs(child_bus);
 586 }
 587
 588 struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
 589                                  struct device *parent)
 590 {
 591         LIST_HEAD(resources);
 592         struct device_node *node = pbm->op->dev.of_node;
 593         struct pci_bus *bus;
 594
 595         printk("PCI: Scanning PBM %s\n", node->full_name);
 596
 597         pci_add_resource_offset(&resources, &pbm->io_space,
 598                                 pbm->io_space.start);
 599         pci_add_resource_offset(&resources, &pbm->mem_space,
 600                                 pbm->mem_space.start);
 601         pbm->busn.start = pbm->pci_first_busno;
 602         pbm->busn.end   = pbm->pci_last_busno;
 603         pbm->busn.flags = IORESOURCE_BUS;
 604         pci_add_resource(&resources, &pbm->busn);
 605         bus = pci_create_root_bus(parent, pbm->pci_first_busno, pbm->pci_ops,
 606                                   pbm, &resources);
 607         if (!bus) {
 608                 printk(KERN_ERR "Failed to create bus for %s\n",
 609                        node->full_name);
 610                 pci_free_resource_list(&resources);
 611                 return NULL;
 612         }
 613
 614         pci_of_scan_bus(pbm, node, bus);
 615         pci_bus_add_devices(bus);
 616         pci_bus_register_of_sysfs(bus);
 617
 618         return bus;
 619 }
 620
 621 void pcibios_fixup_bus(struct pci_bus *pbus)
 622 {
 623 }
 624
 625 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 626                                 resource_size_t size, resource_size_t align)
 627 {
 628         return res->start;
 629 }
 630
 631 int pcibios_enable_device(struct pci_dev *dev, int mask)
 632 {
 633         u16 cmd, oldcmd;
 634         int i;
 635
 636         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 637         oldcmd = cmd;
 638
 639         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 640                 struct resource *res = &dev->resource[i];
 641
 642                 /* Only set up the requested stuff */
 643                 if (!(mask & (1<<i)))
 644                         continue;
 645
 646                 if (res->flags & IORESOURCE_IO)
 647                         cmd |= PCI_COMMAND_IO;
 648                 if (res->flags & IORESOURCE_MEM)
 649                         cmd |= PCI_COMMAND_MEMORY;
 650         }
 651
 652         if (cmd != oldcmd) {
 653                 printk(KERN_DEBUG "PCI: Enabling device: (%s), cmd %x\n",
 654                        pci_name(dev), cmd);
 655                 /* Enable the appropriate bits in the PCI command register.  */
 656                 pci_write_config_word(dev, PCI_COMMAND, cmd);
 657         }
 658         return 0;
 659 }
 660
 661 /* Platform support for /proc/bus/pci/X/Y mmap()s. */
 662
 663 /* If the user uses a host-bridge as the PCI device, he may use
 664  * this to perform a raw mmap() of the I/O or MEM space behind
 665  * that controller.
 666  *
 667  * This can be useful for execution of x86 PCI bios initialization code
 668  * on a PCI card, like the xfree86 int10 stuff does.
 669  */
 670 static int __pci_mmap_make_offset_bus(struct pci_dev *pdev, struct vm_area_struct *vma,
 671                                       enum pci_mmap_state mmap_state)
 672 {
 673         struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
 674         unsigned long space_size, user_offset, user_size;
 675
 676         if (mmap_state == pci_mmap_io) {
 677                 space_size = resource_size(&pbm->io_space);
 678         } else {
 679                 space_size = resource_size(&pbm->mem_space);
 680         }
 681
 682         /* Make sure the request is in range. */
 683         user_offset = vma->vm_pgoff << PAGE_SHIFT;
 684         user_size = vma->vm_end - vma->vm_start;
 685
 686         if (user_offset >= space_size ||
 687             (user_offset + user_size) > space_size)
 688                 return -EINVAL;
 689
 690         if (mmap_state == pci_mmap_io) {
 691                 vma->vm_pgoff = (pbm->io_space.start +
 692                                  user_offset) >> PAGE_SHIFT;
 693         } else {
 694                 vma->vm_pgoff = (pbm->mem_space.start +
 695                                  user_offset) >> PAGE_SHIFT;
 696         }
 697
 698         return 0;
 699 }
 700
 701 /* Adjust vm_pgoff of VMA such that it is the physical page offset
 702  * corresponding to the 32-bit pci bus offset for DEV requested by the user.
 703  *
 704  * Basically, the user finds the base address for his device which he wishes
 705  * to mmap.  They read the 32-bit value from the config space base register,
 706  * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
 707  * offset parameter of mmap on /proc/bus/pci/XXX for that device.
 708  *
 709  * Returns negative error code on failure, zero on success.
 710  */
 711 static int __pci_mmap_make_offset(struct pci_dev *pdev,
 712                                   struct vm_area_struct *vma,
 713                                   enum pci_mmap_state mmap_state)
 714 {
 715         unsigned long user_paddr, user_size;
 716         int i, err;
 717
 718         /* First compute the physical address in vma->vm_pgoff,
 719          * making sure the user offset is within range in the
 720          * appropriate PCI space.
 721          */
 722         err = __pci_mmap_make_offset_bus(pdev, vma, mmap_state);
 723         if (err)
 724                 return err;
 725
 726         /* If this is a mapping on a host bridge, any address
 727          * is OK.
 728          */
 729         if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
 730                 return err;
 731
 732         /* Otherwise make sure it's in the range for one of the
 733          * device's resources.
 734          */
 735         user_paddr = vma->vm_pgoff << PAGE_SHIFT;
 736         user_size = vma->vm_end - vma->vm_start;
 737
 738         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 739                 struct resource *rp = &pdev->resource[i];
 740                 resource_size_t aligned_end;
 741
 742                 /* Active? */
 743                 if (!rp->flags)
 744                         continue;
 745
 746                 /* Same type? */
 747                 if (i == PCI_ROM_RESOURCE) {
 748                         if (mmap_state != pci_mmap_mem)
 749                                 continue;
 750                 } else {
 751                         if ((mmap_state == pci_mmap_io &&
 752                              (rp->flags & IORESOURCE_IO) == 0) ||
 753                             (mmap_state == pci_mmap_mem &&
 754                              (rp->flags & IORESOURCE_MEM) == 0))
 755                                 continue;
 756                 }
 757
 758                 /* Align the resource end to the next page address.
 759                  * PAGE_SIZE intentionally added instead of (PAGE_SIZE - 1),
 760                  * because actually we need the address of the next byte
 761                  * after rp->end.
 762                  */
 763                 aligned_end = (rp->end + PAGE_SIZE) & PAGE_MASK;
 764
 765                 if ((rp->start <= user_paddr) &&
 766                     (user_paddr + user_size) <= aligned_end)
 767                         break;
 768         }
 769
 770         if (i > PCI_ROM_RESOURCE)
 771                 return -EINVAL;
 772
 773         return 0;
 774 }
 775
 776 /* Set vm_flags of VMA, as appropriate for this architecture, for a pci device
 777  * mapping.
 778  */
 779 static void __pci_mmap_set_flags(struct pci_dev *dev, struct vm_area_struct *vma,
 780                                             enum pci_mmap_state mmap_state)
 781 {
 782         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 783 }
 784
 785 /* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
 786  * device mapping.
 787  */
 788 static void __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
 789                                              enum pci_mmap_state mmap_state)
 790 {
 791         /* Our io_remap_pfn_range takes care of this, do nothing.  */
 792 }
 793
 794 /* Perform the actual remap of the pages for a PCI device mapping, as appropriate
 795  * for this architecture.  The region in the process to map is described by vm_start
 796  * and vm_end members of VMA, the base physical address is found in vm_pgoff.
 797  * The pci device structure is provided so that architectures may make mapping
 798  * decisions on a per-device or per-bus basis.
 799  *
 800  * Returns a negative error code on failure, zero on success.
 801  */
 802 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 803                         enum pci_mmap_state mmap_state,
 804                         int write_combine)
 805 {
 806         int ret;
 807
 808         ret = __pci_mmap_make_offset(dev, vma, mmap_state);
 809         if (ret < 0)
 810                 return ret;
 811
 812         __pci_mmap_set_flags(dev, vma, mmap_state);
 813         __pci_mmap_set_pgprot(dev, vma, mmap_state);
 814
 815         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 816         ret = io_remap_pfn_range(vma, vma->vm_start,
 817                                  vma->vm_pgoff,
 818                                  vma->vm_end - vma->vm_start,
 819                                  vma->vm_page_prot);
 820         if (ret)
 821                 return ret;
 822
 823         return 0;
 824 }
 825
 826 #ifdef CONFIG_NUMA
 827 int pcibus_to_node(struct pci_bus *pbus)
 828 {
 829         struct pci_pbm_info *pbm = pbus->sysdata;
 830
 831         return pbm->numa_node;
 832 }
 833 EXPORT_SYMBOL(pcibus_to_node);
 834 #endif
 835
 836 /* Return the domain number for this pci bus */
 837
 838 int pci_domain_nr(struct pci_bus *pbus)
 839 {
 840         struct pci_pbm_info *pbm = pbus->sysdata;
 841         int ret;
 842
 843         if (!pbm) {
 844                 ret = -ENXIO;
 845         } else {
 846                 ret = pbm->index;
 847         }
 848
 849         return ret;
 850 }
 851 EXPORT_SYMBOL(pci_domain_nr);
 852
 853 #ifdef CONFIG_PCI_MSI
 854 int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
 855 {
 856         struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
 857         unsigned int irq;
 858
 859         if (!pbm->setup_msi_irq)
 860                 return -EINVAL;
 861
 862         return pbm->setup_msi_irq(&irq, pdev, desc);
 863 }
 864
 865 void arch_teardown_msi_irq(unsigned int irq)
 866 {
 867         struct msi_desc *entry = irq_get_msi_desc(irq);
 868         struct pci_dev *pdev = entry->dev;
 869         struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
 870
 871         if (pbm->teardown_msi_irq)
 872                 pbm->teardown_msi_irq(irq, pdev);
 873 }
 874 #endif /* !(CONFIG_PCI_MSI) */
 875
 876 static void ali_sound_dma_hack(struct pci_dev *pdev, int set_bit)
 877 {
 878         struct pci_dev *ali_isa_bridge;
 879         u8 val;
 880
 881         /* ALI sound chips generate 31-bits of DMA, a special register
 882          * determines what bit 31 is emitted as.
 883          */
 884         ali_isa_bridge = pci_get_device(PCI_VENDOR_ID_AL,
 885                                          PCI_DEVICE_ID_AL_M1533,
 886                                          NULL);
 887
 888         pci_read_config_byte(ali_isa_bridge, 0x7e, &val);
 889         if (set_bit)
 890                 val |= 0x01;
 891         else
 892                 val &= ~0x01;
 893         pci_write_config_byte(ali_isa_bridge, 0x7e, val);
 894         pci_dev_put(ali_isa_bridge);
 895 }
 896
 897 int pci64_dma_supported(struct pci_dev *pdev, u64 device_mask)
 898 {
 899         u64 dma_addr_mask;
 900
 901         if (pdev == NULL) {
 902                 dma_addr_mask = 0xffffffff;
 903         } else {
 904                 struct iommu *iommu = pdev->dev.archdata.iommu;
 905
 906                 dma_addr_mask = iommu->dma_addr_mask;
 907
 908                 if (pdev->vendor == PCI_VENDOR_ID_AL &&
 909                     pdev->device == PCI_DEVICE_ID_AL_M5451 &&
 910                     device_mask == 0x7fffffff) {
 911                         ali_sound_dma_hack(pdev,
 912                                            (dma_addr_mask & 0x80000000) != 0);
 913                         return 1;
 914                 }
 915         }
 916
 917         if (device_mask >= (1UL << 32UL))
 918                 return 0;
 919
 920         return (device_mask & dma_addr_mask) == dma_addr_mask;
 921 }
 922
 923 void pci_resource_to_user(const struct pci_dev *pdev, int bar,
 924                           const struct resource *rp, resource_size_t *start,
 925                           resource_size_t *end)
 926 {
 927         struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
 928         unsigned long offset;
 929
 930         if (rp->flags & IORESOURCE_IO)
 931                 offset = pbm->io_space.start;
 932         else
 933                 offset = pbm->mem_space.start;
 934
 935         *start = rp->start - offset;
 936         *end = rp->end - offset;
 937 }
 938
 939 void pcibios_set_master(struct pci_dev *dev)
 940 {
 941         /* No special bus mastering setup handling */
 942 }
 943
 944 static int __init pcibios_init(void)
 945 {
 946         pci_dfl_cache_line_size = 64 >> 2;
 947         return 0;
 948 }
 949 subsys_initcall(pcibios_init);
 950
 951 #ifdef CONFIG_SYSFS
 952 static void pci_bus_slot_names(struct device_node *node, struct pci_bus *bus)
 953 {
 954         const struct pci_slot_names {
 955                 u32     slot_mask;
 956                 char    names[0];
 957         } *prop;
 958         const char *sp;
 959         int len, i;
 960         u32 mask;
 961
 962         prop = of_get_property(node, "slot-names", &len);
 963         if (!prop)
 964                 return;
 965
 966         mask = prop->slot_mask;
 967         sp = prop->names;
 968
 969         if (ofpci_verbose)
 970                 printk("PCI: Making slots for [%s] mask[0x%02x]\n",
 971                        node->full_name, mask);
 972
 973         i = 0;
 974         while (mask) {
 975                 struct pci_slot *pci_slot;
 976                 u32 this_bit = 1 << i;
 977
 978                 if (!(mask & this_bit)) {
 979                         i++;
 980                         continue;
 981                 }
 982
 983                 if (ofpci_verbose)
 984                         printk("PCI: Making slot [%s]\n", sp);
 985
 986                 pci_slot = pci_create_slot(bus, i, sp, NULL);
 987                 if (IS_ERR(pci_slot))
 988                         printk(KERN_ERR "PCI: pci_create_slot returned %ld\n",
 989                                PTR_ERR(pci_slot));
 990
 991                 sp += strlen(sp) + 1;
 992                 mask &= ~this_bit;
 993                 i++;
 994         }
 995 }
 996
 997 static int __init of_pci_slot_init(void)
 998 {
 999         struct pci_bus *pbus = NULL;
1000
1001         while ((pbus = pci_find_next_bus(pbus)) != NULL) {
1002                 struct device_node *node;
1003
1004                 if (pbus->self) {
1005                         /* PCI->PCI bridge */
1006                         node = pbus->self->dev.of_node;
1007                 } else {
1008                         struct pci_pbm_info *pbm = pbus->sysdata;
1009
1010                         /* Host PCI controller */
1011                         node = pbm->op->dev.of_node;
1012                 }
1013
1014                 pci_bus_slot_names(node, pbus);
1015         }
1016
1017         return 0;
1018 }
1019
1020 module_init(of_pci_slot_init);
1021 #endif