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); 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 } 451 452 453