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 } 450 451 452