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/byteorder.h> 25#include <asm/uaccess.h> 26 27#undef DEBUG 28 29unsigned long isa_io_base; 30unsigned long pci_dram_offset; 31int pcibios_assign_bus_offset = 1; 32 33static u8 *pci_to_OF_bus_map; 34 35/* By default, we don't re-assign bus numbers. We do this only on 36 * some pmacs 37 */ 38static int pci_assign_all_buses; 39 40static int pci_bus_count; 41 42/* 43 * Functions below are used on OpenFirmware machines. 44 */ 45static void 46make_one_node_map(struct device_node *node, u8 pci_bus) 47{ 48 const int *bus_range; 49 int len; 50 51 if (pci_bus >= pci_bus_count) 52 return; 53 bus_range = of_get_property(node, "bus-range", &len); 54 if (bus_range == NULL || len < 2 * sizeof(int)) { 55 printk(KERN_WARNING "Can't get bus-range for %s, " 56 "assuming it starts at 0\n", node->full_name); 57 pci_to_OF_bus_map[pci_bus] = 0; 58 } else 59 pci_to_OF_bus_map[pci_bus] = bus_range[0]; 60 61 for_each_child_of_node(node, node) { 62 struct pci_dev *dev; 63 const unsigned int *class_code, *reg; 64 65 class_code = of_get_property(node, "class-code", NULL); 66 if (!class_code || 67 ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 68 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 69 continue; 70 reg = of_get_property(node, "reg", NULL); 71 if (!reg) 72 continue; 73 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); 74 if (!dev || !dev->subordinate) { 75 pci_dev_put(dev); 76 continue; 77 } 78 make_one_node_map(node, dev->subordinate->number); 79 pci_dev_put(dev); 80 } 81} 82 83void 84pcibios_make_OF_bus_map(void) 85{ 86 int i; 87 struct pci_controller *hose, *tmp; 88 struct property *map_prop; 89 struct device_node *dn; 90 91 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 92 if (!pci_to_OF_bus_map) { 93 printk(KERN_ERR "Can't allocate OF bus map !\n"); 94 return; 95 } 96 97 /* We fill the bus map with invalid values, that helps 98 * debugging. 99 */ 100 for (i = 0; i < pci_bus_count; i++) 101 pci_to_OF_bus_map[i] = 0xff; 102 103 /* For each hose, we begin searching bridges */ 104 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 105 struct device_node *node = hose->dn; 106 107 if (!node) 108 continue; 109 make_one_node_map(node, hose->first_busno); 110 } 111 dn = of_find_node_by_path("/"); 112 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 113 if (map_prop) { 114 BUG_ON(pci_bus_count > map_prop->length); 115 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 116 } 117 of_node_put(dn); 118#ifdef DEBUG 119 printk(KERN_INFO "PCI->OF bus map:\n"); 120 for (i = 0; i < pci_bus_count; i++) { 121 if (pci_to_OF_bus_map[i] == 0xff) 122 continue; 123 printk(KERN_INFO "%d -> %d\n", i, pci_to_OF_bus_map[i]); 124 } 125#endif 126} 127 128typedef int (*pci_OF_scan_iterator)(struct device_node *node, void *data); 129 130static struct device_node *scan_OF_pci_childs(struct device_node *parent, 131 pci_OF_scan_iterator filter, void *data) 132{ 133 struct device_node *node; 134 struct device_node *sub_node; 135 136 for_each_child_of_node(parent, node) { 137 const unsigned int *class_code; 138 139 if (filter(node, data)) { 140 of_node_put(node); 141 return node; 142 } 143 144 /* For PCI<->PCI bridges or CardBus bridges, we go down 145 * Note: some OFs create a parent node "multifunc-device" as 146 * a fake root for all functions of a multi-function device, 147 * we go down them as well. 148 */ 149 class_code = of_get_property(node, "class-code", NULL); 150 if ((!class_code || 151 ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 152 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) && 153 strcmp(node->name, "multifunc-device")) 154 continue; 155 sub_node = scan_OF_pci_childs(node, filter, data); 156 if (sub_node) { 157 of_node_put(node); 158 return sub_node; 159 } 160 } 161 return NULL; 162} 163 164static struct device_node *scan_OF_for_pci_dev(struct device_node *parent, 165 unsigned int devfn) 166{ 167 struct device_node *np, *cnp; 168 const u32 *reg; 169 unsigned int psize; 170 171 for_each_child_of_node(parent, np) { 172 reg = of_get_property(np, "reg", &psize); 173 if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn) 174 return np; 175 176 /* Note: some OFs create a parent node "multifunc-device" as 177 * a fake root for all functions of a multi-function device, 178 * we go down them as well. */ 179 if (!strcmp(np->name, "multifunc-device")) { 180 cnp = scan_OF_for_pci_dev(np, devfn); 181 if (cnp) 182 return cnp; 183 } 184 } 185 return NULL; 186} 187 188 189static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus) 190{ 191 struct device_node *parent, *np; 192 193 /* Are we a root bus ? */ 194 if (bus->self == NULL || bus->parent == NULL) { 195 struct pci_controller *hose = pci_bus_to_host(bus); 196 if (hose == NULL) 197 return NULL; 198 return of_node_get(hose->dn); 199 } 200 201 /* not a root bus, we need to get our parent */ 202 parent = scan_OF_for_pci_bus(bus->parent); 203 if (parent == NULL) 204 return NULL; 205 206 /* now iterate for children for a match */ 207 np = scan_OF_for_pci_dev(parent, bus->self->devfn); 208 of_node_put(parent); 209 210 return np; 211} 212 213/* 214 * Scans the OF tree for a device node matching a PCI device 215 */ 216struct device_node * 217pci_busdev_to_OF_node(struct pci_bus *bus, int devfn) 218{ 219 struct device_node *parent, *np; 220 221 pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn); 222 parent = scan_OF_for_pci_bus(bus); 223 if (parent == NULL) 224 return NULL; 225 pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>"); 226 np = scan_OF_for_pci_dev(parent, devfn); 227 of_node_put(parent); 228 pr_debug(" result is %s\n", np ? np->full_name : "<NULL>"); 229 230 return np; 231} 232EXPORT_SYMBOL(pci_busdev_to_OF_node); 233 234struct device_node* 235pci_device_to_OF_node(struct pci_dev *dev) 236{ 237 return pci_busdev_to_OF_node(dev->bus, dev->devfn); 238} 239EXPORT_SYMBOL(pci_device_to_OF_node); 240 241static int 242find_OF_pci_device_filter(struct device_node *node, void *data) 243{ 244 return ((void *)node == data); 245} 246 247/* 248 * Returns the PCI device matching a given OF node 249 */ 250int 251pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 252{ 253 const unsigned int *reg; 254 struct pci_controller *hose; 255 struct pci_dev *dev = NULL; 256 257 /* Make sure it's really a PCI device */ 258 hose = pci_find_hose_for_OF_device(node); 259 if (!hose || !hose->dn) 260 return -ENODEV; 261 if (!scan_OF_pci_childs(hose->dn, 262 find_OF_pci_device_filter, (void *)node)) 263 return -ENODEV; 264 reg = of_get_property(node, "reg", NULL); 265 if (!reg) 266 return -ENODEV; 267 *bus = (reg[0] >> 16) & 0xff; 268 *devfn = ((reg[0] >> 8) & 0xff); 269 270 /* Ok, here we need some tweak. If we have already renumbered 271 * all busses, we can't rely on the OF bus number any more. 272 * the pci_to_OF_bus_map is not enough as several PCI busses 273 * may match the same OF bus number. 274 */ 275 if (!pci_to_OF_bus_map) 276 return 0; 277 278 for_each_pci_dev(dev) 279 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 280 dev->devfn == *devfn) { 281 *bus = dev->bus->number; 282 pci_dev_put(dev); 283 return 0; 284 } 285 286 return -ENODEV; 287} 288EXPORT_SYMBOL(pci_device_from_OF_node); 289 290/* We create the "pci-OF-bus-map" property now so it appears in the 291 * /proc device tree 292 */ 293void __init 294pci_create_OF_bus_map(void) 295{ 296 struct property *of_prop; 297 struct device_node *dn; 298 299 of_prop = (struct property *) alloc_bootmem(sizeof(struct property) + \ 300 256); 301 if (!of_prop) 302 return; 303 dn = of_find_node_by_path("/"); 304 if (dn) { 305 memset(of_prop, -1, sizeof(struct property) + 256); 306 of_prop->name = "pci-OF-bus-map"; 307 of_prop->length = 256; 308 of_prop->value = &of_prop[1]; 309 prom_add_property(dn, of_prop); 310 of_node_put(dn); 311 } 312} 313 314static void __devinit pcibios_scan_phb(struct pci_controller *hose) 315{ 316 struct pci_bus *bus; 317 struct device_node *node = hose->dn; 318 unsigned long io_offset; 319 struct resource *res = &hose->io_resource; 320 321 pr_debug("PCI: Scanning PHB %s\n", 322 node ? node->full_name : "<NO NAME>"); 323 324 /* Create an empty bus for the toplevel */ 325 bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose); 326 if (bus == NULL) { 327 printk(KERN_ERR "Failed to create bus for PCI domain %04x\n", 328 hose->global_number); 329 return; 330 } 331 bus->secondary = hose->first_busno; 332 hose->bus = bus; 333 334 /* Fixup IO space offset */ 335 io_offset = (unsigned long)hose->io_base_virt - isa_io_base; 336 res->start = (res->start + io_offset) & 0xffffffffu; 337 res->end = (res->end + io_offset) & 0xffffffffu; 338 339 /* Wire up PHB bus resources */ 340 pcibios_setup_phb_resources(hose); 341 342 /* Scan children */ 343 hose->last_busno = bus->subordinate = pci_scan_child_bus(bus); 344} 345 346static int __init pcibios_init(void) 347{ 348 struct pci_controller *hose, *tmp; 349 int next_busno = 0; 350 351 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 352 353 if (pci_flags & PCI_REASSIGN_ALL_BUS) { 354 printk(KERN_INFO "setting pci_asign_all_busses\n"); 355 pci_assign_all_buses = 1; 356 } 357 358 /* Scan all of the recorded PCI controllers. */ 359 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 360 if (pci_assign_all_buses) 361 hose->first_busno = next_busno; 362 hose->last_busno = 0xff; 363 pcibios_scan_phb(hose); 364 printk(KERN_INFO "calling pci_bus_add_devices()\n"); 365 pci_bus_add_devices(hose->bus); 366 if (pci_assign_all_buses || next_busno <= hose->last_busno) 367 next_busno = hose->last_busno + \ 368 pcibios_assign_bus_offset; 369 } 370 pci_bus_count = next_busno; 371 372 /* OpenFirmware based machines need a map of OF bus 373 * numbers vs. kernel bus numbers since we may have to 374 * remap them. 375 */ 376 if (pci_assign_all_buses) 377 pcibios_make_OF_bus_map(); 378 379 /* Call common code to handle resource allocation */ 380 pcibios_resource_survey(); 381 382 return 0; 383} 384 385subsys_initcall(pcibios_init); 386 387static struct pci_controller* 388pci_bus_to_hose(int bus) 389{ 390 struct pci_controller *hose, *tmp; 391 392 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 393 if (bus >= hose->first_busno && bus <= hose->last_busno) 394 return hose; 395 return NULL; 396} 397 398/* Provide information on locations of various I/O regions in physical 399 * memory. Do this on a per-card basis so that we choose the right 400 * root bridge. 401 * Note that the returned IO or memory base is a physical address 402 */ 403 404long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) 405{ 406 struct pci_controller *hose; 407 long result = -EOPNOTSUPP; 408 409 hose = pci_bus_to_hose(bus); 410 if (!hose) 411 return -ENODEV; 412 413 switch (which) { 414 case IOBASE_BRIDGE_NUMBER: 415 return (long)hose->first_busno; 416 case IOBASE_MEMORY: 417 return (long)hose->pci_mem_offset; 418 case IOBASE_IO: 419 return (long)hose->io_base_phys; 420 case IOBASE_ISA_IO: 421 return (long)isa_io_base; 422 case IOBASE_ISA_MEM: 423 return (long)isa_mem_base; 424 } 425 426 return result; 427} 428