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 31unsigned long isa_io_base = 0; 32unsigned long pci_dram_offset = 0; 33int pcibios_assign_bus_offset = 1; 34 35void pcibios_make_OF_bus_map(void); 36 37static void fixup_cpc710_pci64(struct pci_dev* dev); 38static 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 */ 43static int pci_assign_all_buses; 44 45static 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 */ 50struct pci_dev *isa_bridge_pcidev; 51EXPORT_SYMBOL_GPL(isa_bridge_pcidev); 52 53static void 54fixup_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} 69DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); 70DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); 71 72static void 73fixup_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} 83DECLARE_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 */ 88static void 89make_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 125void 126pcibios_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 170typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data); 171 172static struct device_node* 173scan_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 205static 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 230static 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 */ 257struct device_node * 258pci_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 return np; 272} 273EXPORT_SYMBOL(pci_busdev_to_OF_node); 274 275struct device_node* 276pci_device_to_OF_node(struct pci_dev *dev) 277{ 278 return pci_busdev_to_OF_node(dev->bus, dev->devfn); 279} 280EXPORT_SYMBOL(pci_device_to_OF_node); 281 282static int 283find_OF_pci_device_filter(struct device_node* node, void* data) 284{ 285 return ((void *)node == data); 286} 287 288/* 289 * Returns the PCI device matching a given OF node 290 */ 291int 292pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn) 293{ 294 const unsigned int *reg; 295 struct pci_controller* hose; 296 struct pci_dev* dev = NULL; 297 298 /* Make sure it's really a PCI device */ 299 hose = pci_find_hose_for_OF_device(node); 300 if (!hose || !hose->dn) 301 return -ENODEV; 302 if (!scan_OF_pci_childs(hose->dn, 303 find_OF_pci_device_filter, (void *)node)) 304 return -ENODEV; 305 reg = of_get_property(node, "reg", NULL); 306 if (!reg) 307 return -ENODEV; 308 *bus = (reg[0] >> 16) & 0xff; 309 *devfn = ((reg[0] >> 8) & 0xff); 310 311 /* Ok, here we need some tweak. If we have already renumbered 312 * all busses, we can't rely on the OF bus number any more. 313 * the pci_to_OF_bus_map is not enough as several PCI busses 314 * may match the same OF bus number. 315 */ 316 if (!pci_to_OF_bus_map) 317 return 0; 318 319 for_each_pci_dev(dev) 320 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 321 dev->devfn == *devfn) { 322 *bus = dev->bus->number; 323 pci_dev_put(dev); 324 return 0; 325 } 326 327 return -ENODEV; 328} 329EXPORT_SYMBOL(pci_device_from_OF_node); 330 331/* We create the "pci-OF-bus-map" property now so it appears in the 332 * /proc device tree 333 */ 334void __init 335pci_create_OF_bus_map(void) 336{ 337 struct property* of_prop; 338 struct device_node *dn; 339 340 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256); 341 if (!of_prop) 342 return; 343 dn = of_find_node_by_path("/"); 344 if (dn) { 345 memset(of_prop, -1, sizeof(struct property) + 256); 346 of_prop->name = "pci-OF-bus-map"; 347 of_prop->length = 256; 348 of_prop->value = &of_prop[1]; 349 prom_add_property(dn, of_prop); 350 of_node_put(dn); 351 } 352} 353 354void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose) 355{ 356 unsigned long io_offset; 357 struct resource *res = &hose->io_resource; 358 359 /* Fixup IO space offset */ 360 io_offset = (unsigned long)hose->io_base_virt - isa_io_base; 361 res->start = (res->start + io_offset) & 0xffffffffu; 362 res->end = (res->end + io_offset) & 0xffffffffu; 363} 364 365static int __init pcibios_init(void) 366{ 367 struct pci_controller *hose, *tmp; 368 int next_busno = 0; 369 370 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 371 372 if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS) 373 pci_assign_all_buses = 1; 374 375 /* Scan all of the recorded PCI controllers. */ 376 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 377 if (pci_assign_all_buses) 378 hose->first_busno = next_busno; 379 hose->last_busno = 0xff; 380 pcibios_scan_phb(hose, hose); 381 pci_bus_add_devices(hose->bus); 382 if (pci_assign_all_buses || next_busno <= hose->last_busno) 383 next_busno = hose->last_busno + pcibios_assign_bus_offset; 384 } 385 pci_bus_count = next_busno; 386 387 /* OpenFirmware based machines need a map of OF bus 388 * numbers vs. kernel bus numbers since we may have to 389 * remap them. 390 */ 391 if (pci_assign_all_buses) 392 pcibios_make_OF_bus_map(); 393 394 /* Call common code to handle resource allocation */ 395 pcibios_resource_survey(); 396 397 /* Call machine dependent post-init code */ 398 if (ppc_md.pcibios_after_init) 399 ppc_md.pcibios_after_init(); 400 401 return 0; 402} 403 404subsys_initcall(pcibios_init); 405 406static struct pci_controller* 407pci_bus_to_hose(int bus) 408{ 409 struct pci_controller *hose, *tmp; 410 411 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 412 if (bus >= hose->first_busno && bus <= hose->last_busno) 413 return hose; 414 return NULL; 415} 416 417/* Provide information on locations of various I/O regions in physical 418 * memory. Do this on a per-card basis so that we choose the right 419 * root bridge. 420 * Note that the returned IO or memory base is a physical address 421 */ 422 423long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) 424{ 425 struct pci_controller* hose; 426 long result = -EOPNOTSUPP; 427 428 hose = pci_bus_to_hose(bus); 429 if (!hose) 430 return -ENODEV; 431 432 switch (which) { 433 case IOBASE_BRIDGE_NUMBER: 434 return (long)hose->first_busno; 435 case IOBASE_MEMORY: 436 return (long)hose->pci_mem_offset; 437 case IOBASE_IO: 438 return (long)hose->io_base_phys; 439 case IOBASE_ISA_IO: 440 return (long)isa_io_base; 441 case IOBASE_ISA_MEM: 442 return (long)isa_mem_base; 443 } 444 445 return result; 446} 447