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