Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 1 | /* |
| 2 | * PCI Bus Services, see include/linux/pci.h for further explanation. |
| 3 | * |
| 4 | * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter, |
| 5 | * David Mosberger-Tang |
| 6 | * |
| 7 | * Copyright 1997 -- 1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
| 8 | * |
| 9 | * Copyright 2003 -- Eric Biederman <ebiederman@lnxi.com> |
| 10 | */ |
| 11 | |
| 12 | #include <console/console.h> |
| 13 | #include <stdlib.h> |
| 14 | #include <stdint.h> |
| 15 | #include <bitops.h> |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 16 | #include <string.h> |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 17 | #include <device/device.h> |
| 18 | #include <device/pci.h> |
| 19 | #include <device/pci_ids.h> |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 20 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 21 | /** Given a device and register, read the size of the BAR for that register. |
| 22 | * @param dev Pointer to the device structure |
| 23 | * @param resource Pointer to the resource structure |
| 24 | * @param index Address of the pci configuration register |
| 25 | */ |
| 26 | static void pci_get_resource(struct device *dev, struct resource *resource, unsigned long index) |
| 27 | { |
| 28 | uint32_t addr, size, base; |
| 29 | unsigned long type; |
| 30 | |
| 31 | /* Initialize the resources to nothing */ |
| 32 | resource->base = 0; |
| 33 | resource->size = 0; |
| 34 | resource->align = 0; |
| 35 | resource->gran = 0; |
| 36 | resource->limit = 0; |
| 37 | resource->flags = 0; |
| 38 | resource->index = index; |
| 39 | |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 40 | addr = pci_read_config32(dev, index); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 41 | if (addr == 0xffffffffUL) |
| 42 | return; |
| 43 | |
| 44 | /* FIXME: more consideration for 64-bit PCI devices, |
| 45 | * we currently detect their size but otherwise |
| 46 | * treat them as 32-bit resources |
| 47 | */ |
| 48 | /* get the size */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 49 | pci_write_config32(dev, index, ~0); |
| 50 | size = pci_read_config32(dev, index); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 51 | |
| 52 | /* get the minimum value the bar can be set to */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 53 | pci_write_config32(dev, index, 0); |
| 54 | base = pci_read_config32(dev, index); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 55 | |
| 56 | /* restore addr */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 57 | pci_write_config32(dev, index, addr); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 58 | |
| 59 | /* |
| 60 | * some broken hardware has read-only registers that do not |
| 61 | * really size correctly. You can tell this if addr == size |
| 62 | * Example: the acer m7229 has BARs 1-4 normally read-only. |
| 63 | * so BAR1 at offset 0x10 reads 0x1f1. If you size that register |
| 64 | * by writing 0xffffffff to it, it will read back as 0x1f1 -- a |
| 65 | * violation of the spec. |
| 66 | * We catch this case and ignore it by settting size and type to 0. |
| 67 | * This incidentally catches the common case where registers |
| 68 | * read back as 0 for both address and size. |
| 69 | */ |
| 70 | if ((addr == size) && (addr == base)) { |
| 71 | if (size != 0) { |
| 72 | printk_debug( |
| 73 | "PCI: %02x:%02x.%01x register %02x(%08x), read-only ignoring it\n", |
| 74 | dev->bus->secondary, |
| 75 | PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| 76 | index, addr); |
| 77 | } |
| 78 | resource->flags = 0; |
| 79 | } |
| 80 | /* Now compute the actual size, See PCI Spec 6.2.5.1 ... */ |
| 81 | else if (size & PCI_BASE_ADDRESS_SPACE_IO) { |
| 82 | type = size & (~PCI_BASE_ADDRESS_IO_MASK); |
| 83 | /* BUG! Top 16 bits can be zero (or not) |
| 84 | * So set them to 0xffff so they go away ... |
| 85 | */ |
| 86 | resource->size = (~((size | 0xffff0000) & PCI_BASE_ADDRESS_IO_MASK)) +1; |
| 87 | resource->align = log2(resource->size); |
| 88 | resource->gran = resource->align; |
| 89 | resource->flags = IORESOURCE_IO; |
| 90 | resource->limit = 0xffff; |
| 91 | } |
| 92 | else { |
| 93 | /* A Memory mapped base address */ |
| 94 | type = size & (~PCI_BASE_ADDRESS_MEM_MASK); |
| 95 | resource->size = (~(size &PCI_BASE_ADDRESS_MEM_MASK)) +1; |
| 96 | resource->align = log2(resource->size); |
| 97 | resource->gran = resource->align; |
| 98 | resource->flags = IORESOURCE_MEM; |
| 99 | if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) { |
| 100 | resource->flags |= IORESOURCE_PREFETCH; |
| 101 | } |
| 102 | type &= PCI_BASE_ADDRESS_MEM_TYPE_MASK; |
| 103 | if (type == PCI_BASE_ADDRESS_MEM_TYPE_32) { |
| 104 | /* 32bit limit */ |
| 105 | resource->limit = 0xffffffffUL; |
| 106 | } |
| 107 | else if (type == PCI_BASE_ADDRESS_MEM_TYPE_1M) { |
| 108 | /* 1MB limit */ |
| 109 | resource->limit = 0x000fffffUL; |
| 110 | } |
| 111 | else if (type == PCI_BASE_ADDRESS_MEM_TYPE_64) { |
| 112 | unsigned long index_hi; |
| 113 | /* 64bit limit |
| 114 | * For now just treat this as a 32bit limit |
| 115 | */ |
| 116 | index_hi = index + 4; |
| 117 | resource->limit = 0xffffffffUL; |
| 118 | resource->flags |= IORESOURCE_PCI64; |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 119 | addr = pci_read_config32( dev, index_hi); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 120 | /* get the extended size */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 121 | pci_write_config32(dev, index_hi, 0xffffffffUL); |
| 122 | size = pci_read_config32( dev, index_hi); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 123 | |
| 124 | /* get the minimum value the bar can be set to */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 125 | pci_write_config32(dev, index_hi, 0); |
| 126 | base = pci_read_config32(dev, index_hi); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 127 | |
| 128 | /* restore addr */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 129 | pci_write_config32(dev, index_hi, addr); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 130 | |
| 131 | if ((size == 0xffffffff) && (base == 0)) { |
| 132 | /* Clear the top half of the bar */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 133 | pci_write_config32(dev, index_hi, 0); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 134 | } |
| 135 | else { |
| 136 | printk_err("PCI: %02x:%02x.%01x Unable to handle 64-bit address\n", |
| 137 | dev->bus->secondary, |
| 138 | PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); |
| 139 | resource->flags = IORESOURCE_PCI64; |
| 140 | } |
| 141 | } |
| 142 | else { |
| 143 | /* Invalid value */ |
| 144 | resource->flags = 0; |
| 145 | } |
| 146 | } |
| 147 | /* dev->size holds the flags... */ |
| 148 | return; |
| 149 | } |
| 150 | |
| 151 | /** Read the base address registers for a given device. |
| 152 | * @param dev Pointer to the dev structure |
| 153 | * @param howmany How many registers to read (6 for device, 2 for bridge) |
| 154 | */ |
| 155 | static void pci_read_bases(struct device *dev, unsigned int howmany) |
| 156 | { |
| 157 | unsigned int reg; |
| 158 | unsigned long index; |
| 159 | |
| 160 | reg = dev->resources; |
| 161 | for(index = PCI_BASE_ADDRESS_0; |
| 162 | (reg < MAX_RESOURCES) && (index < PCI_BASE_ADDRESS_0 + (howmany << 2)); ) { |
| 163 | struct resource *resource; |
| 164 | resource = &dev->resource[reg]; |
| 165 | pci_get_resource(dev, resource, index); |
| 166 | reg += (resource->flags & (IORESOURCE_IO | IORESOURCE_MEM))? 1:0; |
| 167 | index += (resource->flags & IORESOURCE_PCI64)?8:4; |
| 168 | } |
| 169 | dev->resources = reg; |
| 170 | } |
| 171 | |
| 172 | |
| 173 | static void pci_bridge_read_bases(struct device *dev) |
| 174 | { |
| 175 | unsigned int reg = dev->resources; |
| 176 | |
| 177 | /* FIXME handle bridges without some of the optional resources */ |
| 178 | |
| 179 | /* Initialize the io space constraints on the current bus */ |
| 180 | dev->resource[reg].base = 0; |
| 181 | dev->resource[reg].size = 0; |
| 182 | dev->resource[reg].align = log2(PCI_IO_BRIDGE_ALIGN); |
| 183 | dev->resource[reg].gran = log2(PCI_IO_BRIDGE_ALIGN); |
| 184 | dev->resource[reg].limit = 0xffffUL; |
| 185 | dev->resource[reg].flags = IORESOURCE_IO | IORESOURCE_PCI_BRIDGE; |
| 186 | dev->resource[reg].index = PCI_IO_BASE; |
| 187 | compute_allocate_resource(dev, &dev->resource[reg], |
| 188 | IORESOURCE_IO, IORESOURCE_IO); |
| 189 | reg++; |
| 190 | |
| 191 | /* Initiliaze the prefetchable memory constraints on the current bus */ |
| 192 | dev->resource[reg].base = 0; |
| 193 | dev->resource[reg].size = 0; |
| 194 | dev->resource[reg].align = log2(PCI_MEM_BRIDGE_ALIGN); |
| 195 | dev->resource[reg].gran = log2(PCI_MEM_BRIDGE_ALIGN); |
| 196 | dev->resource[reg].limit = 0xffffffffUL; |
| 197 | dev->resource[reg].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_PCI_BRIDGE; |
| 198 | dev->resource[reg].index = PCI_PREF_MEMORY_BASE; |
| 199 | compute_allocate_resource(dev, &dev->resource[reg], |
| 200 | IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| 201 | IORESOURCE_MEM | IORESOURCE_PREFETCH); |
| 202 | reg++; |
| 203 | |
| 204 | /* Initialize the memory resources on the current bus */ |
| 205 | dev->resource[reg].base = 0; |
| 206 | dev->resource[reg].size = 0; |
| 207 | dev->resource[reg].align = log2(PCI_MEM_BRIDGE_ALIGN); |
| 208 | dev->resource[reg].gran = log2(PCI_MEM_BRIDGE_ALIGN); |
| 209 | dev->resource[reg].limit = 0xffffffffUL; |
| 210 | dev->resource[reg].flags = IORESOURCE_MEM | IORESOURCE_PCI_BRIDGE; |
| 211 | dev->resource[reg].index = PCI_MEMORY_BASE; |
| 212 | compute_allocate_resource(dev, &dev->resource[reg], |
| 213 | IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| 214 | IORESOURCE_MEM); |
| 215 | reg++; |
| 216 | |
| 217 | dev->resources = reg; |
| 218 | } |
| 219 | |
| 220 | |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 221 | void pci_dev_read_resources(struct device *dev) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 222 | { |
| 223 | uint32_t addr; |
| 224 | dev->resources = 0; |
| 225 | memset(&dev->resource[0], 0, sizeof(dev->resource)); |
| 226 | pci_read_bases(dev, 6); |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 227 | addr = pci_read_config32(dev, PCI_ROM_ADDRESS); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 228 | dev->rom_address = (addr == 0xffffffff)? 0 : addr; |
| 229 | } |
| 230 | |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 231 | void pci_bus_read_resources(struct device *dev) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 232 | { |
| 233 | uint32_t addr; |
| 234 | dev->resources = 0; |
| 235 | memset(&dev->resource[0], 0, sizeof(dev->resource)); |
| 236 | pci_bridge_read_bases(dev); |
| 237 | pci_read_bases(dev, 2); |
| 238 | |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 239 | addr = pci_read_config32(dev, PCI_ROM_ADDRESS1); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 240 | dev->rom_address = (addr == 0xffffffff)? 0 : addr; |
| 241 | |
| 242 | } |
| 243 | |
| 244 | |
| 245 | static void pci_set_resource(struct device *dev, struct resource *resource) |
| 246 | { |
| 247 | unsigned long base, limit; |
| 248 | unsigned long bridge_align = PCI_MEM_BRIDGE_ALIGN; |
| 249 | unsigned char buf[10]; |
| 250 | |
| 251 | /* Make certain the resource has actually been set */ |
| 252 | if (!(resource->flags & IORESOURCE_SET)) { |
| 253 | #if 1 |
| 254 | printk_err("ERROR: %02x:%02x.%01x %02x not allocated\n", |
| 255 | dev->bus->secondary, |
| 256 | PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| 257 | resource->index); |
| 258 | #endif |
| 259 | return; |
| 260 | } |
| 261 | |
| 262 | /* Only handle PCI memory and IO resources for now */ |
| 263 | if (!(resource->flags & (IORESOURCE_MEM |IORESOURCE_IO))) |
| 264 | return; |
| 265 | |
| 266 | if (resource->flags & IORESOURCE_MEM) { |
| 267 | dev->command |= PCI_COMMAND_MEMORY; |
| 268 | bridge_align = PCI_MEM_BRIDGE_ALIGN; |
| 269 | } |
| 270 | if (resource->flags & IORESOURCE_IO) { |
| 271 | dev->command |= PCI_COMMAND_IO; |
| 272 | bridge_align = PCI_IO_BRIDGE_ALIGN; |
| 273 | } |
| 274 | if (resource->flags & IORESOURCE_PCI_BRIDGE) { |
| 275 | dev->command |= PCI_COMMAND_MASTER; |
| 276 | } |
| 277 | /* Get the base address */ |
| 278 | base = resource->base; |
| 279 | |
| 280 | /* Get the limit (rounded up) */ |
| 281 | limit = base + ((resource->size + bridge_align - 1UL) & ~(bridge_align -1)) -1UL; |
| 282 | |
| 283 | if (!(resource->flags & IORESOURCE_PCI_BRIDGE)) { |
| 284 | /* |
| 285 | * some chipsets allow us to set/clear the IO bit. |
| 286 | * (e.g. VIA 82c686a.) So set it to be safe) |
| 287 | */ |
| 288 | limit = base + resource->size -1; |
| 289 | if (resource->flags & IORESOURCE_IO) { |
| 290 | base |= PCI_BASE_ADDRESS_SPACE_IO; |
| 291 | } |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 292 | pci_write_config32(dev, resource->index, base & 0xffffffff); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 293 | if (resource->flags & IORESOURCE_PCI64) { |
| 294 | /* FIXME handle real 64bit base addresses */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 295 | pci_write_config32(dev, resource->index + 4, 0); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 296 | } |
| 297 | } |
| 298 | else if (resource->index == PCI_IO_BASE) { |
| 299 | /* set the IO ranges |
| 300 | * WARNING: we don't really do 32-bit addressing for IO yet! |
| 301 | */ |
| 302 | compute_allocate_resource(dev, resource, |
| 303 | IORESOURCE_IO, IORESOURCE_IO); |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 304 | pci_write_config8(dev, PCI_IO_BASE, base >> 8); |
| 305 | pci_write_config8(dev, PCI_IO_LIMIT, limit >> 8); |
Eric Biederman | 5fb929e | 2003-07-17 02:15:46 +0000 | [diff] [blame] | 306 | pci_write_config16(dev, PCI_IO_BASE_UPPER16, 0); |
| 307 | pci_write_config16(dev, PCI_IO_LIMIT_UPPER16, 0); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 308 | } |
| 309 | else if (resource->index == PCI_MEMORY_BASE) { |
| 310 | /* set the memory range |
| 311 | */ |
| 312 | compute_allocate_resource(dev, resource, |
| 313 | IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| 314 | IORESOURCE_MEM); |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 315 | pci_write_config16(dev, PCI_MEMORY_BASE, base >> 16); |
| 316 | pci_write_config16(dev, PCI_MEMORY_LIMIT, limit >> 16); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 317 | } |
| 318 | else if (resource->index == PCI_PREF_MEMORY_BASE) { |
| 319 | /* set the prefetchable memory range |
| 320 | * WARNING: we don't really do 64-bit addressing for prefetchable memory yet! |
| 321 | */ |
| 322 | compute_allocate_resource(dev, resource, |
| 323 | IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| 324 | IORESOURCE_MEM | IORESOURCE_PREFETCH); |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 325 | pci_write_config16(dev, PCI_PREF_MEMORY_BASE, base >> 16); |
| 326 | pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT, limit >> 16); |
Eric Biederman | 5fb929e | 2003-07-17 02:15:46 +0000 | [diff] [blame] | 327 | pci_write_config32(dev, PCI_PREF_BASE_UPPER32, 0); |
| 328 | pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32, 0); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 329 | } |
| 330 | else { |
| 331 | printk_err("ERROR: invalid resource->index %x\n", |
| 332 | resource->index); |
| 333 | } |
| 334 | buf[0] = '\0'; |
| 335 | if (resource->flags & IORESOURCE_PCI_BRIDGE) { |
| 336 | sprintf(buf, "bus %d ", dev->secondary); |
| 337 | } |
| 338 | |
| 339 | printk_debug( |
| 340 | "PCI: %02x:%02x.%01x %02x <- [0x%08lx - 0x%08lx] %s%s\n", |
| 341 | dev->bus->secondary, |
| 342 | PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| 343 | resource->index, |
| 344 | resource->base, limit, |
| 345 | buf, |
| 346 | (resource->flags & IORESOURCE_IO)? "io": |
| 347 | (resource->flags & IORESOURCE_PREFETCH)? "prefmem": "mem"); |
| 348 | return; |
| 349 | } |
| 350 | |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 351 | void pci_dev_set_resources(struct device *dev) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 352 | { |
| 353 | struct resource *resource, *last; |
| 354 | uint8_t line; |
| 355 | |
| 356 | last = &dev->resource[dev->resources]; |
| 357 | |
| 358 | for(resource = &dev->resource[0]; resource < last; resource++) { |
| 359 | pci_set_resource(dev, resource); |
| 360 | } |
| 361 | if (dev->children) { |
| 362 | assign_resources(dev); |
| 363 | } |
| 364 | |
| 365 | /* set a default latency timer */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 366 | pci_write_config8(dev, PCI_LATENCY_TIMER, 0x40); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 367 | |
| 368 | /* set a default secondary latency timer */ |
| 369 | if ((dev->hdr_type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) { |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 370 | pci_write_config8(dev, PCI_SEC_LATENCY_TIMER, 0x40); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | /* zero the irq settings */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 374 | line = pci_read_config8(dev, PCI_INTERRUPT_PIN); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 375 | if (line) { |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 376 | pci_write_config8(dev, PCI_INTERRUPT_LINE, 0); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 377 | } |
| 378 | /* set the cache line size, so far 64 bytes is good for everyone */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 379 | pci_write_config8(dev, PCI_CACHE_LINE_SIZE, 64 >> 2); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | struct device_operations default_pci_ops_dev = { |
| 383 | .read_resources = pci_dev_read_resources, |
| 384 | .set_resources = pci_dev_set_resources, |
| 385 | .init = 0, |
| 386 | .scan_bus = 0, |
| 387 | }; |
| 388 | struct device_operations default_pci_ops_bus = { |
| 389 | .read_resources = pci_bus_read_resources, |
| 390 | .set_resources = pci_dev_set_resources, |
| 391 | .init = 0, |
| 392 | .scan_bus = pci_scan_bridge, |
| 393 | }; |
| 394 | static void set_pci_ops(struct device *dev) |
| 395 | { |
| 396 | struct pci_driver *driver; |
| 397 | if (dev->ops) { |
| 398 | return; |
| 399 | } |
| 400 | /* Look through the list of setup drivers and find one for |
| 401 | * this pci device |
| 402 | */ |
| 403 | for(driver = &pci_drivers[0]; driver != &epci_drivers[0]; driver++) { |
| 404 | if ((driver->vendor == dev->vendor) && |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 405 | (driver->device == dev->device)) { |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 406 | dev->ops = driver->ops; |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 407 | #if 1 |
| 408 | printk_debug("PCI: %02x:%02x.%01x [%04x/%04x] ops\n", |
| 409 | dev->bus->secondary, |
| 410 | PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| 411 | driver->vendor, driver->device |
| 412 | ); |
| 413 | #endif |
| 414 | return; |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 415 | } |
| 416 | } |
| 417 | /* If I don't have a specific driver use the default operations */ |
| 418 | switch(dev->hdr_type & 0x7f) { /* header type */ |
| 419 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ |
| 420 | if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) |
| 421 | goto bad; |
| 422 | dev->ops = &default_pci_ops_dev; |
| 423 | break; |
| 424 | case PCI_HEADER_TYPE_BRIDGE: |
| 425 | if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI) |
| 426 | goto bad; |
| 427 | dev->ops = &default_pci_ops_bus; |
| 428 | break; |
| 429 | default: |
| 430 | bad: |
| 431 | printk_err("PCI: %02x:%02x.%01x [%04x/%04x/%06x] has unknown header " |
| 432 | "type %02x, ignoring.\n", |
| 433 | dev->bus->secondary, |
| 434 | PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| 435 | dev->vendor, dev->device, |
| 436 | dev->class >> 8, dev->hdr_type); |
| 437 | } |
| 438 | return; |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * Given a bus and a devfn number, find the device structure |
| 443 | * @param bus The bus structure |
| 444 | * @param devfn a device/function number |
| 445 | * @return pointer to the device structure |
| 446 | */ |
| 447 | static struct device *pci_scan_get_dev(struct device **list, unsigned int devfn) |
| 448 | { |
| 449 | struct device *dev = 0; |
| 450 | for(; *list; list = &(*list)->sibling) { |
| 451 | if ((*list)->devfn == devfn) { |
| 452 | /* Unlink from the list */ |
| 453 | dev = *list; |
| 454 | *list = (*list)->sibling; |
| 455 | dev->sibling = 0; |
| 456 | break; |
| 457 | } |
| 458 | } |
| 459 | return dev; |
| 460 | } |
| 461 | |
| 462 | |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 463 | #define HYPERTRANSPORT_SUPPORT 1 |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 464 | /** Scan the pci bus devices and bridges. |
| 465 | * @param pci_bus pointer to the bus structure |
| 466 | * @param max current bus number |
| 467 | * @return The maximum bus number found, after scanning all subordinate busses |
| 468 | */ |
| 469 | unsigned int pci_scan_bus(struct device *bus, unsigned int max) |
| 470 | { |
| 471 | unsigned int devfn; |
| 472 | struct device *dev, **bus_last; |
| 473 | struct device *old_devices; |
| 474 | struct device *child; |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 475 | #if HYPERTRANSPORT_SUPPORT |
Eric Biederman | 860ad37 | 2003-07-21 23:30:29 +0000 | [diff] [blame^] | 476 | unsigned next_unitid, last_unitid, previous_unitid; |
| 477 | int reset_needed; |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 478 | #endif |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 479 | |
| 480 | printk_debug("PCI: pci_scan_bus for bus %d\n", bus->secondary); |
| 481 | |
| 482 | old_devices = bus->children; |
| 483 | bus->children = 0; |
| 484 | bus_last = &bus->children; |
| 485 | |
| 486 | post_code(0x24); |
| 487 | |
| 488 | |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 489 | #if HYPERTRANSPORT_SUPPORT |
Eric Biederman | 860ad37 | 2003-07-21 23:30:29 +0000 | [diff] [blame^] | 490 | /* Spin through the devices and collapse any early |
| 491 | * hypertransport enumeration. |
| 492 | */ |
| 493 | for(devfn = 0; devfn <= 0xff; devfn += 8) { |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 494 | struct device dummy; |
| 495 | uint32_t id; |
| 496 | uint8_t hdr_type, pos; |
Eric Biederman | 860ad37 | 2003-07-21 23:30:29 +0000 | [diff] [blame^] | 497 | dummy.bus = bus; |
| 498 | dummy.devfn = devfn; |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 499 | id = pci_read_config32(&dummy, PCI_VENDOR_ID); |
Eric Biederman | 860ad37 | 2003-07-21 23:30:29 +0000 | [diff] [blame^] | 500 | if (id == 0xffffffff || id == 0x00000000 || |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 501 | id == 0x0000ffff || id == 0xffff0000) { |
Eric Biederman | 860ad37 | 2003-07-21 23:30:29 +0000 | [diff] [blame^] | 502 | continue; |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 503 | } |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 504 | hdr_type = pci_read_config8(&dummy, PCI_HEADER_TYPE); |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 505 | pos = 0; |
| 506 | switch(hdr_type & 0x7f) { |
| 507 | case PCI_HEADER_TYPE_NORMAL: |
| 508 | case PCI_HEADER_TYPE_BRIDGE: |
| 509 | pos = PCI_CAPABILITY_LIST; |
| 510 | break; |
| 511 | } |
| 512 | if (pos > PCI_CAP_LIST_NEXT) { |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 513 | pos = pci_read_config8(&dummy, pos); |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 514 | } |
| 515 | while(pos != 0) { |
| 516 | uint8_t cap; |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 517 | cap = pci_read_config8(&dummy, pos + PCI_CAP_LIST_ID); |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 518 | printk_debug("Capability: 0x%02x @ 0x%02x\n", cap, pos); |
| 519 | if (cap == PCI_CAP_ID_HT) { |
| 520 | uint16_t flags; |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 521 | flags = pci_read_config16(&dummy, pos + PCI_CAP_FLAGS); |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 522 | printk_debug("flags: 0x%04x\n", (unsigned)flags); |
| 523 | if ((flags >> 13) == 0) { |
Eric Biederman | 860ad37 | 2003-07-21 23:30:29 +0000 | [diff] [blame^] | 524 | /* Clear the unitid */ |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 525 | flags &= ~0x1f; |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 526 | pci_write_config16(&dummy, pos + PCI_CAP_FLAGS, flags); |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 527 | break; |
| 528 | } |
| 529 | } |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 530 | pos = pci_read_config8(&dummy, pos + PCI_CAP_LIST_NEXT); |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 531 | } |
Eric Biederman | 860ad37 | 2003-07-21 23:30:29 +0000 | [diff] [blame^] | 532 | } |
| 533 | /* If present assign unitid to a hypertransport chain */ |
| 534 | last_unitid = 0; |
| 535 | next_unitid = 1; |
| 536 | do { |
| 537 | struct device dummy; |
| 538 | uint32_t id; |
| 539 | uint8_t hdr_type, pos, previous_pos; |
| 540 | |
| 541 | previous_unitid = last_unitid; |
| 542 | last_unitid = next_unitid; |
| 543 | |
| 544 | /* Read the next unassigned device off the stack */ |
| 545 | dummy.bus = bus; |
| 546 | dummy.devfn = 0; |
| 547 | id = pci_read_config32(&dummy, PCI_VENDOR_ID); |
| 548 | /* If the chain is enumerated quit */ |
| 549 | if (id == 0xffffffff || id == 0x00000000 || |
| 550 | id == 0x0000ffff || id == 0xffff0000) { |
| 551 | break; |
| 552 | } |
| 553 | hdr_type = pci_read_config8(&dummy, PCI_HEADER_TYPE); |
| 554 | pos = 0; |
| 555 | switch(hdr_type & 0x7f) { |
| 556 | case PCI_HEADER_TYPE_NORMAL: |
| 557 | case PCI_HEADER_TYPE_BRIDGE: |
| 558 | pos = PCI_CAPABILITY_LIST; |
| 559 | break; |
| 560 | } |
| 561 | if (pos > PCI_CAP_LIST_NEXT) { |
| 562 | pos = pci_read_config8(&dummy, pos); |
| 563 | } |
| 564 | while(pos != 0) { /* loop through the linked list */ |
| 565 | uint8_t cap; |
| 566 | cap = pci_read_config8(&dummy, pos + PCI_CAP_LIST_ID); |
| 567 | printk_debug("Capability: 0x%02x @ 0x%02x\n", cap, pos); |
| 568 | if (cap == PCI_CAP_ID_HT) { |
| 569 | uint16_t flags; |
| 570 | uint16_t links; |
| 571 | flags = pci_read_config16(&dummy, pos + PCI_CAP_FLAGS); |
| 572 | printk_debug("flags: 0x%04x\n", (unsigned)flags); |
| 573 | if ((flags >> 13) == 0) { /* Entry is a Slave secondary */ |
| 574 | struct device last, previous; |
| 575 | unsigned count; |
| 576 | unsigned width; |
| 577 | flags &= ~0x1f; /* mask out base unit ID */ |
| 578 | flags |= next_unitid & 0x1f; /* assign ID */ |
| 579 | count = (flags >> 5) & 0x1f; /* get unit count */ |
| 580 | printk_debug("unitid: 0x%02x, count: 0x%02x\n", |
| 581 | next_unitid, count); |
| 582 | pci_write_config16(&dummy, pos + PCI_CAP_FLAGS, flags); |
| 583 | next_unitid += count; |
| 584 | |
| 585 | if (previous_unitid == 0) { /* the link is back to the host */ |
| 586 | /* calculate the previous pos for the host */ |
| 587 | previous_pos = 0x80; |
| 588 | previous.bus = 0; |
| 589 | previous.devfn = 0x18 << 3; |
| 590 | #warning "FIXME we should not hard code this!" |
| 591 | } else { |
| 592 | previous.bus = bus; |
| 593 | previous.devfn = previous_unitid << 3; |
| 594 | } |
| 595 | last.bus = bus; |
| 596 | last.devfn = last_unitid << 3; |
| 597 | /* Set link width and frequency */ |
| 598 | flags = pci_read_config16(&last, pos + PCI_HT_CAP_SLAVE_FREQ_CAP0); |
| 599 | cap = pci_read_config8(&last, pos + PCI_HT_CAP_SLAVE_WIDTH0); |
| 600 | if(previous_unitid == 0) { /* the link is back to the host */ |
| 601 | links = pci_read_config16(&previous, |
| 602 | previous_pos + PCI_HT_CAP_HOST_FREQ_CAP); |
| 603 | width = pci_read_config8(&previous, |
| 604 | previous_pos + PCI_HT_CAP_HOST_WIDTH); |
| 605 | } |
| 606 | else { /* The link is back up the chain */ |
| 607 | links = pci_read_config16(&previous, |
| 608 | previous_pos + PCI_HT_CAP_SLAVE_FREQ_CAP1); |
| 609 | width = pci_read_config8(&previous, |
| 610 | previous_pos + PCI_HT_CAP_SLAVE_WIDTH1); |
| 611 | } |
| 612 | /* Calculate the highest possible frequency */ |
| 613 | links &= flags; |
| 614 | for(flags = 0x40, count = 6; count; count--, flags >>= 1) { |
| 615 | if(flags & links) break; |
| 616 | } |
| 617 | /* Calculate the highest width */ |
| 618 | width &= cap; |
| 619 | /* set the present device */ |
| 620 | if(count != pci_read_config8(&last, pos + PCI_HT_CAP_HOST_FREQ)) { |
| 621 | pci_write_config8(&last, pos + PCI_HT_CAP_HOST_FREQ, count); |
| 622 | reset_needed = 1; |
| 623 | } |
| 624 | if(width != pci_read_config8(&last, pos + PCI_HT_CAP_SLAVE_WIDTH0 + 1)) { |
| 625 | pci_write_config8(&last, |
| 626 | pos + PCI_HT_CAP_SLAVE_WIDTH0 + 1, width); |
| 627 | reset_needed = 1; |
| 628 | } |
| 629 | |
| 630 | /* set the upstream device */ |
| 631 | if(previous_unitid == 0) { /* the link is back to the host */ |
| 632 | cap = pci_read_config8(&previous, previous_pos + PCI_HT_CAP_HOST_FREQ); |
| 633 | cap &= 0x0f; |
| 634 | if(count != cap) { |
| 635 | pci_write_config8(&previous, |
| 636 | previous_pos + PCI_HT_CAP_HOST_FREQ, count); |
| 637 | reset_needed = 1; |
| 638 | } |
| 639 | cap = pci_read_config8(&previous, previous_pos + PCI_HT_CAP_HOST_WIDTH + 1); |
| 640 | if(width != cap) { |
| 641 | pci_write_config8(&previous, |
| 642 | previous_pos + PCI_HT_CAP_HOST_WIDTH + 1, width); |
| 643 | reset_needed = 1; |
| 644 | } |
| 645 | } |
| 646 | else { /* The link is back up the chain */ |
| 647 | cap = pci_read_config8(&previous, |
| 648 | previous_pos + PCI_HT_CAP_SLAVE_FREQ1); |
| 649 | cap &= 0x0f; |
| 650 | if(count != cap) { |
| 651 | pci_write_config8(&previous, |
| 652 | previous_pos + PCI_HT_CAP_SLAVE_FREQ1, count); |
| 653 | reset_needed = 1; |
| 654 | } |
| 655 | cap = pci_read_config8(&previous, |
| 656 | previous_pos + PCI_HT_CAP_SLAVE_WIDTH1 + 1); |
| 657 | if(width != cap) { |
| 658 | pci_write_config8(&previous, |
| 659 | previous_pos + PCI_HT_CAP_SLAVE_WIDTH1, width); |
| 660 | reset_needed = 1; |
| 661 | } |
| 662 | } |
| 663 | break; |
| 664 | } |
| 665 | } |
| 666 | pos = pci_read_config8(&dummy, pos + PCI_CAP_LIST_NEXT); |
| 667 | } |
| 668 | previous_pos = pos; |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 669 | } while((last_unitid != next_unitid) && (next_unitid <= 0x1f)); |
| 670 | #endif /* HYPERTRANSPORT_SUPPORT */ |
| 671 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 672 | /* probe all devices on this bus with some optimization for non-existance and |
| 673 | single funcion devices */ |
Eric Biederman | 5268557 | 2003-05-19 19:16:21 +0000 | [diff] [blame] | 674 | for (devfn = 0; devfn <= 0xff; devfn++) { |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 675 | struct device dummy; |
| 676 | uint32_t id, class; |
| 677 | uint8_t cmd, tmp, hdr_type; |
| 678 | |
| 679 | /* First thing setup the device structure */ |
| 680 | dev = pci_scan_get_dev(&old_devices, devfn); |
| 681 | |
| 682 | dummy.bus = bus; |
| 683 | dummy.devfn = devfn; |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 684 | id = pci_read_config32(&dummy, PCI_VENDOR_ID); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 685 | /* some broken boards return 0 if a slot is empty: */ |
| 686 | if (!dev && |
| 687 | (id == 0xffffffff || id == 0x00000000 || |
| 688 | id == 0x0000ffff || id == 0xffff0000)) { |
| 689 | printk_spew("PCI: devfn 0x%x, bad id 0x%x\n", devfn, id); |
| 690 | if (PCI_FUNC(devfn) == 0x00) { |
| 691 | /* if this is a function 0 device and it is not present, |
| 692 | skip to next device */ |
| 693 | devfn += 0x07; |
| 694 | } |
| 695 | /* multi function device, skip to next function */ |
| 696 | continue; |
| 697 | } |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 698 | hdr_type = pci_read_config8(&dummy, PCI_HEADER_TYPE); |
| 699 | class = pci_read_config32(&dummy, PCI_CLASS_REVISION); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 700 | |
| 701 | if (!dev) { |
| 702 | if ((dev = malloc(sizeof(*dev))) == 0) { |
| 703 | printk_err("PCI: out of memory.\n"); |
| 704 | continue; |
| 705 | } |
| 706 | memset(dev, 0, sizeof(*dev)); |
Eric Biederman | 4086d16 | 2003-07-17 03:26:03 +0000 | [diff] [blame] | 707 | dev->bus = bus; |
| 708 | dev->devfn = devfn; |
| 709 | dev->vendor = id & 0xffff; |
| 710 | dev->device = (id >> 16) & 0xffff; |
| 711 | dev->hdr_type = hdr_type; |
| 712 | /* class code, the upper 3 bytes of PCI_CLASS_REVISION */ |
| 713 | dev->class = class >> 8; |
| 714 | |
| 715 | /* If we don't have prior information about this device enable it */ |
| 716 | dev->enable = 1; |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 717 | } |
| 718 | |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 719 | /* Look at the vendor and device id, or at least the |
| 720 | * header type and class and figure out which set of configuration |
| 721 | * methods to use. |
| 722 | */ |
| 723 | set_pci_ops(dev); |
| 724 | /* Kill the device if we don't have some pci operations for it */ |
| 725 | if (!dev->ops) { |
| 726 | free(dev); |
| 727 | continue; |
| 728 | } |
Eric Biederman | 4086d16 | 2003-07-17 03:26:03 +0000 | [diff] [blame] | 729 | |
| 730 | /* Now run the magic enable/disable sequence for the device */ |
| 731 | if (dev->ops && dev->ops->enable) { |
| 732 | dev->ops->enable(dev); |
| 733 | } |
| 734 | |
| 735 | printk_debug("PCI: %02x:%02x.%01x [%04x/%04x] %s\n", |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 736 | bus->secondary, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
Eric Biederman | 4086d16 | 2003-07-17 03:26:03 +0000 | [diff] [blame] | 737 | dev->vendor, dev->device, |
| 738 | dev->enable?"enabled": "disabled"); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 739 | |
| 740 | /* Put it into the global device chain. */ |
| 741 | append_device(dev); |
| 742 | |
| 743 | /* Now insert it into the list of devices held by the parent bus. */ |
| 744 | *bus_last = dev; |
| 745 | bus_last = &dev->sibling; |
| 746 | |
| 747 | if (PCI_FUNC(devfn) == 0x00 && (hdr_type & 0x80) != 0x80) { |
| 748 | /* if this is not a multi function device, don't waste time probe |
| 749 | another function. Skip to next device. */ |
| 750 | devfn += 0x07; |
| 751 | } |
| 752 | } |
| 753 | post_code(0x25); |
| 754 | |
| 755 | for(child = bus->children; child; child = child->sibling) { |
| 756 | if (!child->ops->scan_bus) |
| 757 | continue; |
| 758 | max = child->ops->scan_bus(child, max); |
| 759 | |
| 760 | } |
| 761 | /* |
| 762 | * We've scanned the bus and so we know all about what's on |
| 763 | * the other side of any bridges that may be on this bus plus |
| 764 | * any devices. |
| 765 | * |
| 766 | * Return how far we've got finding sub-buses. |
| 767 | */ |
| 768 | printk_debug("PCI: pci_scan_bus returning with max=%02x\n", max); |
| 769 | post_code(0x55); |
| 770 | return max; |
| 771 | } |
| 772 | |
| 773 | /** Scan the bus, first for bridges and next for devices. |
| 774 | * @param pci_bus pointer to the bus structure |
| 775 | * @return The maximum bus number found, after scanning all subordinate busses |
| 776 | */ |
Eric Biederman | 5899fd8 | 2003-04-24 06:25:08 +0000 | [diff] [blame] | 777 | unsigned int pci_scan_bridge(struct device *bus, unsigned int max) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 778 | { |
| 779 | uint32_t buses; |
| 780 | uint16_t cr; |
| 781 | /* Set up the primary, secondary and subordinate bus numbers. We have |
| 782 | * no idea how many buses are behind this bridge yet, so we set the |
| 783 | * subordinate bus number to 0xff for the moment |
| 784 | */ |
| 785 | bus->secondary = ++max; |
| 786 | bus->subordinate = 0xff; |
| 787 | |
| 788 | /* Clear all status bits and turn off memory, I/O and master enables. */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 789 | cr = pci_read_config16(bus, PCI_COMMAND); |
| 790 | pci_write_config16(bus, PCI_COMMAND, 0x0000); |
| 791 | pci_write_config16(bus, PCI_STATUS, 0xffff); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 792 | |
| 793 | /* |
| 794 | * Read the existing primary/secondary/subordinate bus |
| 795 | * number configuration. |
| 796 | */ |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 797 | buses = pci_read_config32(bus, PCI_PRIMARY_BUS); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 798 | |
| 799 | /* Configure the bus numbers for this bridge: the configuration |
| 800 | * transactions will not be propagated by the bridge if it is not |
| 801 | * correctly configured |
| 802 | */ |
| 803 | buses &= 0xff000000; |
| 804 | buses |= (((unsigned int) (bus->bus->secondary) << 0) | |
| 805 | ((unsigned int) (bus->secondary) << 8) | |
| 806 | ((unsigned int) (bus->subordinate) << 16)); |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 807 | pci_write_config32(bus, PCI_PRIMARY_BUS, buses); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 808 | |
| 809 | /* Now we can scan all subordinate buses i.e. the bus hehind the bridge */ |
| 810 | max = pci_scan_bus(bus, max); |
| 811 | |
| 812 | /* We know the number of buses behind this bridge. Set the subordinate |
| 813 | * bus number to its real value |
| 814 | */ |
| 815 | bus->subordinate = max; |
| 816 | buses = (buses & 0xff00ffff) | |
| 817 | ((unsigned int) (bus->subordinate) << 16); |
Eric Biederman | 7a5416a | 2003-06-12 19:23:51 +0000 | [diff] [blame] | 818 | pci_write_config32(bus, PCI_PRIMARY_BUS, buses); |
| 819 | pci_write_config16(bus, PCI_COMMAND, cr); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 820 | |
| 821 | return max; |
| 822 | } |
| 823 | |
| 824 | |
| 825 | static void pci_root_read_resources(struct device *bus) |
| 826 | { |
| 827 | int res = 0; |
| 828 | /* Initialize the system wide io space constraints */ |
| 829 | bus->resource[res].base = 0x400; |
| 830 | bus->resource[res].size = 0; |
| 831 | bus->resource[res].align = 0; |
| 832 | bus->resource[res].gran = 0; |
| 833 | bus->resource[res].limit = 0xffffUL; |
| 834 | bus->resource[res].flags = IORESOURCE_IO; |
| 835 | bus->resource[res].index = PCI_IO_BASE; |
| 836 | compute_allocate_resource(bus, &bus->resource[res], |
| 837 | IORESOURCE_IO, IORESOURCE_IO); |
| 838 | res++; |
| 839 | |
| 840 | /* Initialize the system wide memory resources constraints */ |
| 841 | bus->resource[res].base = 0; |
| 842 | bus->resource[res].size = 0; |
| 843 | bus->resource[res].align = 0; |
| 844 | bus->resource[res].gran = 0; |
| 845 | bus->resource[res].limit = 0xffffffffUL; |
| 846 | bus->resource[res].flags = IORESOURCE_MEM; |
| 847 | bus->resource[res].index = PCI_MEMORY_BASE; |
| 848 | compute_allocate_resource(bus, &bus->resource[res], |
| 849 | IORESOURCE_MEM, IORESOURCE_MEM); |
| 850 | res++; |
| 851 | |
| 852 | bus->resources = res; |
| 853 | } |
| 854 | static void pci_root_set_resources(struct device *bus) |
| 855 | { |
| 856 | compute_allocate_resource(bus, |
| 857 | &bus->resource[0], IORESOURCE_IO, IORESOURCE_IO); |
| 858 | compute_allocate_resource(bus, |
| 859 | &bus->resource[1], IORESOURCE_MEM, IORESOURCE_MEM); |
| 860 | assign_resources(bus); |
| 861 | } |
| 862 | |
| 863 | struct device_operations default_pci_ops_root = { |
| 864 | .read_resources = pci_root_read_resources, |
| 865 | .set_resources = pci_root_set_resources, |
| 866 | .init = 0, |
| 867 | .scan_bus = pci_scan_bus, |
| 868 | }; |
| 869 | |