1 /* 2 * linux/arch/alpha/kernel/pci.c 3 * 4 * Extruded from code written by 5 * Dave Rusling (david.rusling@reo.mts.dec.com) 6 * David Mosberger (davidm@cs.arizona.edu) 7 */ 8 9 /* 2.3.x PCI/resources, 1999 Andrea Arcangeli <andrea@suse.de> */ 10 11 /* 12 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru> 13 * PCI-PCI bridges cleanup 14 */ 15 #include <linux/string.h> 16 #include <linux/pci.h> 17 #include <linux/init.h> 18 #include <linux/ioport.h> 19 #include <linux/kernel.h> 20 #include <linux/bootmem.h> 21 #include <linux/module.h> 22 #include <linux/cache.h> 23 #include <linux/slab.h> 24 #include <asm/machvec.h> 25 26 #include "proto.h" 27 #include "pci_impl.h" 28 29 30 /* 31 * Some string constants used by the various core logics. 32 */ 33 34 const char *const pci_io_names[] = { 35 "PCI IO bus 0", "PCI IO bus 1", "PCI IO bus 2", "PCI IO bus 3", 36 "PCI IO bus 4", "PCI IO bus 5", "PCI IO bus 6", "PCI IO bus 7" 37 }; 38 39 const char *const pci_mem_names[] = { 40 "PCI mem bus 0", "PCI mem bus 1", "PCI mem bus 2", "PCI mem bus 3", 41 "PCI mem bus 4", "PCI mem bus 5", "PCI mem bus 6", "PCI mem bus 7" 42 }; 43 44 const char pci_hae0_name[] = "HAE0"; 45 46 /* 47 * If PCI_PROBE_ONLY in pci_flags is set, we don't change any PCI resource 48 * assignments. 49 */ 50 51 /* 52 * The PCI controller list. 53 */ 54 55 struct pci_controller *hose_head, **hose_tail = &hose_head; 56 struct pci_controller *pci_isa_hose; 57 58 /* 59 * Quirks. 60 */ 61 62 static void quirk_isa_bridge(struct pci_dev *dev) 63 { 64 dev->class = PCI_CLASS_BRIDGE_ISA << 8; 65 } 66 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82378, quirk_isa_bridge); 67 68 static void quirk_cypress(struct pci_dev *dev) 69 { 70 /* The Notorious Cy82C693 chip. */ 71 72 /* The generic legacy mode IDE fixup in drivers/pci/probe.c 73 doesn't work correctly with the Cypress IDE controller as 74 it has non-standard register layout. Fix that. */ 75 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE) { 76 dev->resource[2].start = dev->resource[3].start = 0; 77 dev->resource[2].end = dev->resource[3].end = 0; 78 dev->resource[2].flags = dev->resource[3].flags = 0; 79 if (PCI_FUNC(dev->devfn) == 2) { 80 dev->resource[0].start = 0x170; 81 dev->resource[0].end = 0x177; 82 dev->resource[1].start = 0x376; 83 dev->resource[1].end = 0x376; 84 } 85 } 86 87 /* The Cypress bridge responds on the PCI bus in the address range 88 0xffff0000-0xffffffff (conventional x86 BIOS ROM). There is no 89 way to turn this off. The bridge also supports several extended 90 BIOS ranges (disabled after power-up), and some consoles do turn 91 them on. So if we use a large direct-map window, or a large SG 92 window, we must avoid the entire 0xfff00000-0xffffffff region. */ 93 if (dev->class >> 8 == PCI_CLASS_BRIDGE_ISA) { 94 if (__direct_map_base + __direct_map_size >= 0xfff00000UL) 95 __direct_map_size = 0xfff00000UL - __direct_map_base; 96 else { 97 struct pci_controller *hose = dev->sysdata; 98 struct pci_iommu_arena *pci = hose->sg_pci; 99 if (pci && pci->dma_base + pci->size >= 0xfff00000UL) 100 pci->size = 0xfff00000UL - pci->dma_base; 101 } 102 } 103 } 104 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, quirk_cypress); 105 106 /* Called for each device after PCI setup is done. */ 107 static void pcibios_fixup_final(struct pci_dev *dev) 108 { 109 unsigned int class = dev->class >> 8; 110 111 if (class == PCI_CLASS_BRIDGE_ISA || class == PCI_CLASS_BRIDGE_EISA) { 112 dev->dma_mask = MAX_ISA_DMA_ADDRESS - 1; 113 isa_bridge = dev; 114 } 115 } 116 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final); 117 118 /* Just declaring that the power-of-ten prefixes are actually the 119 power-of-two ones doesn't make it true :) */ 120 #define KB 1024 121 #define MB (1024*KB) 122 #define GB (1024*MB) 123 124 resource_size_t 125 pcibios_align_resource(void *data, const struct resource *res, 126 resource_size_t size, resource_size_t align) 127 { 128 struct pci_dev *dev = data; 129 struct pci_controller *hose = dev->sysdata; 130 unsigned long alignto; 131 resource_size_t start = res->start; 132 133 if (res->flags & IORESOURCE_IO) { 134 /* Make sure we start at our min on all hoses */ 135 if (start - hose->io_space->start < PCIBIOS_MIN_IO) 136 start = PCIBIOS_MIN_IO + hose->io_space->start; 137 138 /* 139 * Put everything into 0x00-0xff region modulo 0x400 140 */ 141 if (start & 0x300) 142 start = (start + 0x3ff) & ~0x3ff; 143 } 144 else if (res->flags & IORESOURCE_MEM) { 145 /* Make sure we start at our min on all hoses */ 146 if (start - hose->mem_space->start < PCIBIOS_MIN_MEM) 147 start = PCIBIOS_MIN_MEM + hose->mem_space->start; 148 149 /* 150 * The following holds at least for the Low Cost 151 * Alpha implementation of the PCI interface: 152 * 153 * In sparse memory address space, the first 154 * octant (16MB) of every 128MB segment is 155 * aliased to the very first 16 MB of the 156 * address space (i.e., it aliases the ISA 157 * memory address space). Thus, we try to 158 * avoid allocating PCI devices in that range. 159 * Can be allocated in 2nd-7th octant only. 160 * Devices that need more than 112MB of 161 * address space must be accessed through 162 * dense memory space only! 163 */ 164 165 /* Align to multiple of size of minimum base. */ 166 alignto = max_t(resource_size_t, 0x1000, align); 167 start = ALIGN(start, alignto); 168 if (hose->sparse_mem_base && size <= 7 * 16*MB) { 169 if (((start / (16*MB)) & 0x7) == 0) { 170 start &= ~(128*MB - 1); 171 start += 16*MB; 172 start = ALIGN(start, alignto); 173 } 174 if (start/(128*MB) != (start + size - 1)/(128*MB)) { 175 start &= ~(128*MB - 1); 176 start += (128 + 16)*MB; 177 start = ALIGN(start, alignto); 178 } 179 } 180 } 181 182 return start; 183 } 184 #undef KB 185 #undef MB 186 #undef GB 187 188 static int __init 189 pcibios_init(void) 190 { 191 if (alpha_mv.init_pci) 192 alpha_mv.init_pci(); 193 return 0; 194 } 195 196 subsys_initcall(pcibios_init); 197 198 #ifdef ALPHA_RESTORE_SRM_SETUP 199 static struct pdev_srm_saved_conf *srm_saved_configs; 200 201 void pdev_save_srm_config(struct pci_dev *dev) 202 { 203 struct pdev_srm_saved_conf *tmp; 204 static int printed = 0; 205 206 if (!alpha_using_srm || pci_has_flag(PCI_PROBE_ONLY)) 207 return; 208 209 if (!printed) { 210 printk(KERN_INFO "pci: enabling save/restore of SRM state\n"); 211 printed = 1; 212 } 213 214 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); 215 if (!tmp) { 216 printk(KERN_ERR "%s: kmalloc() failed!\n", __func__); 217 return; 218 } 219 tmp->next = srm_saved_configs; 220 tmp->dev = dev; 221 222 pci_save_state(dev); 223 224 srm_saved_configs = tmp; 225 } 226 227 void 228 pci_restore_srm_config(void) 229 { 230 struct pdev_srm_saved_conf *tmp; 231 232 /* No need to restore if probed only. */ 233 if (pci_has_flag(PCI_PROBE_ONLY)) 234 return; 235 236 /* Restore SRM config. */ 237 for (tmp = srm_saved_configs; tmp; tmp = tmp->next) { 238 pci_restore_state(tmp->dev); 239 } 240 } 241 #endif 242 243 void pcibios_fixup_bus(struct pci_bus *bus) 244 { 245 struct pci_dev *dev = bus->self; 246 247 if (pci_has_flag(PCI_PROBE_ONLY) && dev && 248 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 249 pci_read_bridge_bases(bus); 250 } 251 252 list_for_each_entry(dev, &bus->devices, bus_list) { 253 pdev_save_srm_config(dev); 254 } 255 } 256 257 int 258 pcibios_enable_device(struct pci_dev *dev, int mask) 259 { 260 return pci_enable_resources(dev, mask); 261 } 262 263 /* 264 * If we set up a device for bus mastering, we need to check the latency 265 * timer as certain firmware forgets to set it properly, as seen 266 * on SX164 and LX164 with SRM. 267 */ 268 void 269 pcibios_set_master(struct pci_dev *dev) 270 { 271 u8 lat; 272 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat); 273 if (lat >= 16) return; 274 printk("PCI: Setting latency timer of device %s to 64\n", 275 pci_name(dev)); 276 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64); 277 } 278 279 void __init 280 pcibios_claim_one_bus(struct pci_bus *b) 281 { 282 struct pci_dev *dev; 283 struct pci_bus *child_bus; 284 285 list_for_each_entry(dev, &b->devices, bus_list) { 286 int i; 287 288 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 289 struct resource *r = &dev->resource[i]; 290 291 if (r->parent || !r->start || !r->flags) 292 continue; 293 if (pci_has_flag(PCI_PROBE_ONLY) || 294 (r->flags & IORESOURCE_PCI_FIXED)) 295 pci_claim_resource(dev, i); 296 } 297 } 298 299 list_for_each_entry(child_bus, &b->children, node) 300 pcibios_claim_one_bus(child_bus); 301 } 302 303 static void __init 304 pcibios_claim_console_setup(void) 305 { 306 struct pci_bus *b; 307 308 list_for_each_entry(b, &pci_root_buses, node) 309 pcibios_claim_one_bus(b); 310 } 311 312 void __init 313 common_init_pci(void) 314 { 315 struct pci_controller *hose; 316 struct list_head resources; 317 struct pci_bus *bus; 318 int next_busno; 319 int need_domain_info = 0; 320 u32 pci_mem_end; 321 u32 sg_base; 322 unsigned long end; 323 324 /* Scan all of the recorded PCI controllers. */ 325 for (next_busno = 0, hose = hose_head; hose; hose = hose->next) { 326 sg_base = hose->sg_pci ? hose->sg_pci->dma_base : ~0; 327 328 /* Adjust hose mem_space limit to prevent PCI allocations 329 in the iommu windows. */ 330 pci_mem_end = min((u32)__direct_map_base, sg_base) - 1; 331 end = hose->mem_space->start + pci_mem_end; 332 if (hose->mem_space->end > end) 333 hose->mem_space->end = end; 334 335 INIT_LIST_HEAD(&resources); 336 pci_add_resource_offset(&resources, hose->io_space, 337 hose->io_space->start); 338 pci_add_resource_offset(&resources, hose->mem_space, 339 hose->mem_space->start); 340 341 bus = pci_scan_root_bus(NULL, next_busno, alpha_mv.pci_ops, 342 hose, &resources); 343 hose->bus = bus; 344 hose->need_domain_info = need_domain_info; 345 next_busno = bus->busn_res.end + 1; 346 /* Don't allow 8-bit bus number overflow inside the hose - 347 reserve some space for bridges. */ 348 if (next_busno > 224) { 349 next_busno = 0; 350 need_domain_info = 1; 351 } 352 } 353 354 pcibios_claim_console_setup(); 355 356 pci_assign_unassigned_resources(); 357 pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq); 358 } 359 360 361 struct pci_controller * __init 362 alloc_pci_controller(void) 363 { 364 struct pci_controller *hose; 365 366 hose = alloc_bootmem(sizeof(*hose)); 367 368 *hose_tail = hose; 369 hose_tail = &hose->next; 370 371 return hose; 372 } 373 374 struct resource * __init 375 alloc_resource(void) 376 { 377 struct resource *res; 378 379 res = alloc_bootmem(sizeof(*res)); 380 381 return res; 382 } 383 384 385 /* Provide information on locations of various I/O regions in physical 386 memory. Do this on a per-card basis so that we choose the right hose. */ 387 388 asmlinkage long 389 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn) 390 { 391 struct pci_controller *hose; 392 struct pci_dev *dev; 393 394 /* from hose or from bus.devfn */ 395 if (which & IOBASE_FROM_HOSE) { 396 for(hose = hose_head; hose; hose = hose->next) 397 if (hose->index == bus) break; 398 if (!hose) return -ENODEV; 399 } else { 400 /* Special hook for ISA access. */ 401 if (bus == 0 && dfn == 0) { 402 hose = pci_isa_hose; 403 } else { 404 dev = pci_get_bus_and_slot(bus, dfn); 405 if (!dev) 406 return -ENODEV; 407 hose = dev->sysdata; 408 pci_dev_put(dev); 409 } 410 } 411 412 switch (which & ~IOBASE_FROM_HOSE) { 413 case IOBASE_HOSE: 414 return hose->index; 415 case IOBASE_SPARSE_MEM: 416 return hose->sparse_mem_base; 417 case IOBASE_DENSE_MEM: 418 return hose->dense_mem_base; 419 case IOBASE_SPARSE_IO: 420 return hose->sparse_io_base; 421 case IOBASE_DENSE_IO: 422 return hose->dense_io_base; 423 case IOBASE_ROOT_BUS: 424 return hose->bus->number; 425 } 426 427 return -EOPNOTSUPP; 428 } 429 430 /* Destroy an __iomem token. Not copied from lib/iomap.c. */ 431 432 void pci_iounmap(struct pci_dev *dev, void __iomem * addr) 433 { 434 if (__is_mmio(addr)) 435 iounmap(addr); 436 } 437 438 EXPORT_SYMBOL(pci_iounmap); 439 440 /* FIXME: Some boxes have multiple ISA bridges! */ 441 struct pci_dev *isa_bridge; 442 EXPORT_SYMBOL(isa_bridge); 443