arch/powerpc/kernel/pci_32.c

   1 /*
   2  * Common pmac/prep/chrp pci routines. -- Cort
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/pci.h>
   7 #include <linux/delay.h>
   8 #include <linux/string.h>
   9 #include <linux/init.h>
  10 #include <linux/capability.h>
  11 #include <linux/sched.h>
  12 #include <linux/errno.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/irq.h>
  15 #include <linux/list.h>
  16 #include <linux/of.h>
  17 #include <linux/slab.h>
  18
  19 #include <asm/processor.h>
  20 #include <asm/io.h>
  21 #include <asm/prom.h>
  22 #include <asm/sections.h>
  23 #include <asm/pci-bridge.h>
  24 #include <asm/ppc-pci.h>
  25 #include <asm/byteorder.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/machdep.h>
  28
  29 #undef DEBUG
  30
  31 unsigned long isa_io_base     = 0;
  32 unsigned long pci_dram_offset = 0;
  33 int pcibios_assign_bus_offset = 1;
  34
  35 void pcibios_make_OF_bus_map(void);
  36
  37 static void fixup_cpc710_pci64(struct pci_dev* dev);
  38 static u8* pci_to_OF_bus_map;
  39
  40 /* By default, we don't re-assign bus numbers. We do this only on
  41  * some pmacs
  42  */
  43 static int pci_assign_all_buses;
  44
  45 static int pci_bus_count;
  46
  47 /* This will remain NULL for now, until isa-bridge.c is made common
  48  * to both 32-bit and 64-bit.
  49  */
  50 struct pci_dev *isa_bridge_pcidev;
  51 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
  52
  53 static void
  54 fixup_hide_host_resource_fsl(struct pci_dev *dev)
  55 {
  56         int i, class = dev->class >> 8;
  57
  58         if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
  59              class == PCI_CLASS_BRIDGE_OTHER) &&
  60                 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
  61                 (dev->bus->parent == NULL)) {
  62                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
  63                         dev->resource[i].start = 0;
  64                         dev->resource[i].end = 0;
  65                         dev->resource[i].flags = 0;
  66                 }
  67         }
  68 }
  69 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
  70 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
  71
  72 static void
  73 fixup_cpc710_pci64(struct pci_dev* dev)
  74 {
  75         /* Hide the PCI64 BARs from the kernel as their content doesn't
  76          * fit well in the resource management
  77          */
  78         dev->resource[0].start = dev->resource[0].end = 0;
  79         dev->resource[0].flags = 0;
  80         dev->resource[1].start = dev->resource[1].end = 0;
  81         dev->resource[1].flags = 0;
  82 }
  83 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,     PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
  84
  85 /*
  86  * Functions below are used on OpenFirmware machines.
  87  */
  88 static void
  89 make_one_node_map(struct device_node* node, u8 pci_bus)
  90 {
  91         const int *bus_range;
  92         int len;
  93
  94         if (pci_bus >= pci_bus_count)
  95                 return;
  96         bus_range = of_get_property(node, "bus-range", &len);
  97         if (bus_range == NULL || len < 2 * sizeof(int)) {
  98                 printk(KERN_WARNING "Can't get bus-range for %s, "
  99                        "assuming it starts at 0\n", node->full_name);
 100                 pci_to_OF_bus_map[pci_bus] = 0;
 101         } else
 102                 pci_to_OF_bus_map[pci_bus] = bus_range[0];
 103
 104         for_each_child_of_node(node, node) {
 105                 struct pci_dev* dev;
 106                 const unsigned int *class_code, *reg;
 107
 108                 class_code = of_get_property(node, "class-code", NULL);
 109                 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 110                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 111                         continue;
 112                 reg = of_get_property(node, "reg", NULL);
 113                 if (!reg)
 114                         continue;
 115                 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
 116                 if (!dev || !dev->subordinate) {
 117                         pci_dev_put(dev);
 118                         continue;
 119                 }
 120                 make_one_node_map(node, dev->subordinate->number);
 121                 pci_dev_put(dev);
 122         }
 123 }
 124
 125 void
 126 pcibios_make_OF_bus_map(void)
 127 {
 128         int i;
 129         struct pci_controller *hose, *tmp;
 130         struct property *map_prop;
 131         struct device_node *dn;
 132
 133         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 134         if (!pci_to_OF_bus_map) {
 135                 printk(KERN_ERR "Can't allocate OF bus map !\n");
 136                 return;
 137         }
 138
 139         /* We fill the bus map with invalid values, that helps
 140          * debugging.
 141          */
 142         for (i=0; i<pci_bus_count; i++)
 143                 pci_to_OF_bus_map[i] = 0xff;
 144
 145         /* For each hose, we begin searching bridges */
 146         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 147                 struct device_node* node = hose->dn;
 148
 149                 if (!node)
 150                         continue;
 151                 make_one_node_map(node, hose->first_busno);
 152         }
 153         dn = of_find_node_by_path("/");
 154         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 155         if (map_prop) {
 156                 BUG_ON(pci_bus_count > map_prop->length);
 157                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 158         }
 159         of_node_put(dn);
 160 #ifdef DEBUG
 161         printk("PCI->OF bus map:\n");
 162         for (i=0; i<pci_bus_count; i++) {
 163                 if (pci_to_OF_bus_map[i] == 0xff)
 164                         continue;
 165                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 166         }
 167 #endif
 168 }
 169
 170 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
 171
 172 static struct device_node*
 173 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
 174 {
 175         struct device_node *node;
 176         struct device_node* sub_node;
 177
 178         for_each_child_of_node(parent, node) {
 179                 const unsigned int *class_code;
 180
 181                 if (filter(node, data)) {
 182                         of_node_put(node);
 183                         return node;
 184                 }
 185
 186                 /* For PCI<->PCI bridges or CardBus bridges, we go down
 187                  * Note: some OFs create a parent node "multifunc-device" as
 188                  * a fake root for all functions of a multi-function device,
 189                  * we go down them as well.
 190                  */
 191                 class_code = of_get_property(node, "class-code", NULL);
 192                 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 193                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
 194                         strcmp(node->name, "multifunc-device"))
 195                         continue;
 196                 sub_node = scan_OF_pci_childs(node, filter, data);
 197                 if (sub_node) {
 198                         of_node_put(node);
 199                         return sub_node;
 200                 }
 201         }
 202         return NULL;
 203 }
 204
 205 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
 206                                                unsigned int devfn)
 207 {
 208         struct device_node *np, *cnp;
 209         const u32 *reg;
 210         unsigned int psize;
 211
 212         for_each_child_of_node(parent, np) {
 213                 reg = of_get_property(np, "reg", &psize);
 214                 if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn)
 215                         return np;
 216
 217                 /* Note: some OFs create a parent node "multifunc-device" as
 218                  * a fake root for all functions of a multi-function device,
 219                  * we go down them as well. */
 220                 if (!strcmp(np->name, "multifunc-device")) {
 221                         cnp = scan_OF_for_pci_dev(np, devfn);
 222                         if (cnp)
 223                                 return cnp;
 224                 }
 225         }
 226         return NULL;
 227 }
 228
 229
 230 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
 231 {
 232         struct device_node *parent, *np;
 233
 234         /* Are we a root bus ? */
 235         if (bus->self == NULL || bus->parent == NULL) {
 236                 struct pci_controller *hose = pci_bus_to_host(bus);
 237                 if (hose == NULL)
 238                         return NULL;
 239                 return of_node_get(hose->dn);
 240         }
 241
 242         /* not a root bus, we need to get our parent */
 243         parent = scan_OF_for_pci_bus(bus->parent);
 244         if (parent == NULL)
 245                 return NULL;
 246
 247         /* now iterate for children for a match */
 248         np = scan_OF_for_pci_dev(parent, bus->self->devfn);
 249         of_node_put(parent);
 250
 251         return np;
 252 }
 253
 254 /*
 255  * Scans the OF tree for a device node matching a PCI device
 256  */
 257 struct device_node *
 258 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
 259 {
 260         struct device_node *parent, *np;
 261
 262         pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
 263         parent = scan_OF_for_pci_bus(bus);
 264         if (parent == NULL)
 265                 return NULL;
 266         pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
 267         np = scan_OF_for_pci_dev(parent, devfn);
 268         of_node_put(parent);
 269         pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");
 270
 271         /* XXX most callers don't release the returned node
 272          * mostly because ppc64 doesn't increase the refcount,
 273          * we need to fix that.
 274          */
 275         return np;
 276 }
 277 EXPORT_SYMBOL(pci_busdev_to_OF_node);
 278
 279 struct device_node*
 280 pci_device_to_OF_node(struct pci_dev *dev)
 281 {
 282         return pci_busdev_to_OF_node(dev->bus, dev->devfn);
 283 }
 284 EXPORT_SYMBOL(pci_device_to_OF_node);
 285
 286 static int
 287 find_OF_pci_device_filter(struct device_node* node, void* data)
 288 {
 289         return ((void *)node == data);
 290 }
 291
 292 /*
 293  * Returns the PCI device matching a given OF node
 294  */
 295 int
 296 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
 297 {
 298         const unsigned int *reg;
 299         struct pci_controller* hose;
 300         struct pci_dev* dev = NULL;
 301
 302         /* Make sure it's really a PCI device */
 303         hose = pci_find_hose_for_OF_device(node);
 304         if (!hose || !hose->dn)
 305                 return -ENODEV;
 306         if (!scan_OF_pci_childs(hose->dn,
 307                         find_OF_pci_device_filter, (void *)node))
 308                 return -ENODEV;
 309         reg = of_get_property(node, "reg", NULL);
 310         if (!reg)
 311                 return -ENODEV;
 312         *bus = (reg[0] >> 16) & 0xff;
 313         *devfn = ((reg[0] >> 8) & 0xff);
 314
 315         /* Ok, here we need some tweak. If we have already renumbered
 316          * all busses, we can't rely on the OF bus number any more.
 317          * the pci_to_OF_bus_map is not enough as several PCI busses
 318          * may match the same OF bus number.
 319          */
 320         if (!pci_to_OF_bus_map)
 321                 return 0;
 322
 323         for_each_pci_dev(dev)
 324                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 325                                 dev->devfn == *devfn) {
 326                         *bus = dev->bus->number;
 327                         pci_dev_put(dev);
 328                         return 0;
 329                 }
 330
 331         return -ENODEV;
 332 }
 333 EXPORT_SYMBOL(pci_device_from_OF_node);
 334
 335 /* We create the "pci-OF-bus-map" property now so it appears in the
 336  * /proc device tree
 337  */
 338 void __init
 339 pci_create_OF_bus_map(void)
 340 {
 341         struct property* of_prop;
 342         struct device_node *dn;
 343
 344         of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
 345         if (!of_prop)
 346                 return;
 347         dn = of_find_node_by_path("/");
 348         if (dn) {
 349                 memset(of_prop, -1, sizeof(struct property) + 256);
 350                 of_prop->name = "pci-OF-bus-map";
 351                 of_prop->length = 256;
 352                 of_prop->value = &of_prop[1];
 353                 prom_add_property(dn, of_prop);
 354                 of_node_put(dn);
 355         }
 356 }
 357
 358 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
 359 {
 360         unsigned long io_offset;
 361         struct resource *res = &hose->io_resource;
 362
 363         /* Fixup IO space offset */
 364         io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
 365         res->start = (res->start + io_offset) & 0xffffffffu;
 366         res->end = (res->end + io_offset) & 0xffffffffu;
 367 }
 368
 369 static int __init pcibios_init(void)
 370 {
 371         struct pci_controller *hose, *tmp;
 372         int next_busno = 0;
 373
 374         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 375
 376         if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
 377                 pci_assign_all_buses = 1;
 378
 379         /* Scan all of the recorded PCI controllers.  */
 380         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 381                 if (pci_assign_all_buses)
 382                         hose->first_busno = next_busno;
 383                 hose->last_busno = 0xff;
 384                 pcibios_scan_phb(hose, hose);
 385                 pci_bus_add_devices(hose->bus);
 386                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
 387                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
 388         }
 389         pci_bus_count = next_busno;
 390
 391         /* OpenFirmware based machines need a map of OF bus
 392          * numbers vs. kernel bus numbers since we may have to
 393          * remap them.
 394          */
 395         if (pci_assign_all_buses)
 396                 pcibios_make_OF_bus_map();
 397
 398         /* Call common code to handle resource allocation */
 399         pcibios_resource_survey();
 400
 401         /* Call machine dependent post-init code */
 402         if (ppc_md.pcibios_after_init)
 403                 ppc_md.pcibios_after_init();
 404
 405         return 0;
 406 }
 407
 408 subsys_initcall(pcibios_init);
 409
 410 static struct pci_controller*
 411 pci_bus_to_hose(int bus)
 412 {
 413         struct pci_controller *hose, *tmp;
 414
 415         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 416                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 417                         return hose;
 418         return NULL;
 419 }
 420
 421 /* Provide information on locations of various I/O regions in physical
 422  * memory.  Do this on a per-card basis so that we choose the right
 423  * root bridge.
 424  * Note that the returned IO or memory base is a physical address
 425  */
 426
 427 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 428 {
 429         struct pci_controller* hose;
 430         long result = -EOPNOTSUPP;
 431
 432         hose = pci_bus_to_hose(bus);
 433         if (!hose)
 434                 return -ENODEV;
 435
 436         switch (which) {
 437         case IOBASE_BRIDGE_NUMBER:
 438                 return (long)hose->first_busno;
 439         case IOBASE_MEMORY:
 440                 return (long)hose->pci_mem_offset;
 441         case IOBASE_IO:
 442                 return (long)hose->io_base_phys;
 443         case IOBASE_ISA_IO:
 444                 return (long)isa_io_base;
 445         case IOBASE_ISA_MEM:
 446                 return (long)isa_mem_base;
 447         }
 448
 449         return result;
 450 }
 451
 452