Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * $Id: pci.c,v 1.91 1999/01/21 13:34:01 davem Exp $ |
| 3 | * |
| 4 | * PCI Bus Services, see include/linux/pci.h for further explanation. |
| 5 | * |
| 6 | * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter, |
| 7 | * David Mosberger-Tang |
| 8 | * |
| 9 | * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz> |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/pci.h> |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 16 | #include <linux/pm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/module.h> |
| 18 | #include <linux/spinlock.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 19 | #include <linux/string.h> |
vignesh babu | 229f5af | 2007-08-13 18:23:14 +0530 | [diff] [blame] | 20 | #include <linux/log2.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <asm/dma.h> /* isa_dma_bridge_buggy */ |
Greg KH | bc56b9e | 2005-04-08 14:53:31 +0900 | [diff] [blame] | 22 | #include "pci.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Kristen Carlson Accardi | ffadcc2 | 2006-07-12 08:59:00 -0700 | [diff] [blame] | 24 | unsigned int pci_pm_d3_delay = 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Jeff Garzik | 32a2eea | 2007-10-11 16:57:27 -0400 | [diff] [blame] | 26 | #ifdef CONFIG_PCI_DOMAINS |
| 27 | int pci_domains_supported = 1; |
| 28 | #endif |
| 29 | |
Atsushi Nemoto | 4516a61 | 2007-02-05 16:36:06 -0800 | [diff] [blame] | 30 | #define DEFAULT_CARDBUS_IO_SIZE (256) |
| 31 | #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024) |
| 32 | /* pci=cbmemsize=nnM,cbiosize=nn can override this */ |
| 33 | unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE; |
| 34 | unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE; |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | /** |
| 37 | * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children |
| 38 | * @bus: pointer to PCI bus structure to search |
| 39 | * |
| 40 | * Given a PCI bus, returns the highest PCI bus number present in the set |
| 41 | * including the given PCI bus and its list of child PCI buses. |
| 42 | */ |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 43 | unsigned char pci_bus_max_busnr(struct pci_bus* bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | { |
| 45 | struct list_head *tmp; |
| 46 | unsigned char max, n; |
| 47 | |
Kristen Accardi | b82db5c | 2006-01-17 16:56:56 -0800 | [diff] [blame] | 48 | max = bus->subordinate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | list_for_each(tmp, &bus->children) { |
| 50 | n = pci_bus_max_busnr(pci_bus_b(tmp)); |
| 51 | if(n > max) |
| 52 | max = n; |
| 53 | } |
| 54 | return max; |
| 55 | } |
Kristen Accardi | b82db5c | 2006-01-17 16:56:56 -0800 | [diff] [blame] | 56 | EXPORT_SYMBOL_GPL(pci_bus_max_busnr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Kristen Accardi | b82db5c | 2006-01-17 16:56:56 -0800 | [diff] [blame] | 58 | #if 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /** |
| 60 | * pci_max_busnr - returns maximum PCI bus number |
| 61 | * |
| 62 | * Returns the highest PCI bus number present in the system global list of |
| 63 | * PCI buses. |
| 64 | */ |
| 65 | unsigned char __devinit |
| 66 | pci_max_busnr(void) |
| 67 | { |
| 68 | struct pci_bus *bus = NULL; |
| 69 | unsigned char max, n; |
| 70 | |
| 71 | max = 0; |
| 72 | while ((bus = pci_find_next_bus(bus)) != NULL) { |
| 73 | n = pci_bus_max_busnr(bus); |
| 74 | if(n > max) |
| 75 | max = n; |
| 76 | } |
| 77 | return max; |
| 78 | } |
| 79 | |
Adrian Bunk | 54c762f | 2005-12-22 01:08:52 +0100 | [diff] [blame] | 80 | #endif /* 0 */ |
| 81 | |
Michael Ellerman | 687d5fe | 2006-11-22 18:26:18 +1100 | [diff] [blame] | 82 | #define PCI_FIND_CAP_TTL 48 |
| 83 | |
| 84 | static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn, |
| 85 | u8 pos, int cap, int *ttl) |
Roland Dreier | 24a4e37 | 2005-10-28 17:35:34 -0700 | [diff] [blame] | 86 | { |
| 87 | u8 id; |
Roland Dreier | 24a4e37 | 2005-10-28 17:35:34 -0700 | [diff] [blame] | 88 | |
Michael Ellerman | 687d5fe | 2006-11-22 18:26:18 +1100 | [diff] [blame] | 89 | while ((*ttl)--) { |
Roland Dreier | 24a4e37 | 2005-10-28 17:35:34 -0700 | [diff] [blame] | 90 | pci_bus_read_config_byte(bus, devfn, pos, &pos); |
| 91 | if (pos < 0x40) |
| 92 | break; |
| 93 | pos &= ~3; |
| 94 | pci_bus_read_config_byte(bus, devfn, pos + PCI_CAP_LIST_ID, |
| 95 | &id); |
| 96 | if (id == 0xff) |
| 97 | break; |
| 98 | if (id == cap) |
| 99 | return pos; |
| 100 | pos += PCI_CAP_LIST_NEXT; |
| 101 | } |
| 102 | return 0; |
| 103 | } |
| 104 | |
Michael Ellerman | 687d5fe | 2006-11-22 18:26:18 +1100 | [diff] [blame] | 105 | static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn, |
| 106 | u8 pos, int cap) |
| 107 | { |
| 108 | int ttl = PCI_FIND_CAP_TTL; |
| 109 | |
| 110 | return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl); |
| 111 | } |
| 112 | |
Roland Dreier | 24a4e37 | 2005-10-28 17:35:34 -0700 | [diff] [blame] | 113 | int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap) |
| 114 | { |
| 115 | return __pci_find_next_cap(dev->bus, dev->devfn, |
| 116 | pos + PCI_CAP_LIST_NEXT, cap); |
| 117 | } |
| 118 | EXPORT_SYMBOL_GPL(pci_find_next_capability); |
| 119 | |
Michael Ellerman | d3bac11 | 2006-11-22 18:26:16 +1100 | [diff] [blame] | 120 | static int __pci_bus_find_cap_start(struct pci_bus *bus, |
| 121 | unsigned int devfn, u8 hdr_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | { |
| 123 | u16 status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status); |
| 126 | if (!(status & PCI_STATUS_CAP_LIST)) |
| 127 | return 0; |
| 128 | |
| 129 | switch (hdr_type) { |
| 130 | case PCI_HEADER_TYPE_NORMAL: |
| 131 | case PCI_HEADER_TYPE_BRIDGE: |
Michael Ellerman | d3bac11 | 2006-11-22 18:26:16 +1100 | [diff] [blame] | 132 | return PCI_CAPABILITY_LIST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | case PCI_HEADER_TYPE_CARDBUS: |
Michael Ellerman | d3bac11 | 2006-11-22 18:26:16 +1100 | [diff] [blame] | 134 | return PCI_CB_CAPABILITY_LIST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | default: |
| 136 | return 0; |
| 137 | } |
Michael Ellerman | d3bac11 | 2006-11-22 18:26:16 +1100 | [diff] [blame] | 138 | |
| 139 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | /** |
| 143 | * pci_find_capability - query for devices' capabilities |
| 144 | * @dev: PCI device to query |
| 145 | * @cap: capability code |
| 146 | * |
| 147 | * Tell if a device supports a given PCI capability. |
| 148 | * Returns the address of the requested capability structure within the |
| 149 | * device's PCI configuration space or 0 in case the device does not |
| 150 | * support it. Possible values for @cap: |
| 151 | * |
| 152 | * %PCI_CAP_ID_PM Power Management |
| 153 | * %PCI_CAP_ID_AGP Accelerated Graphics Port |
| 154 | * %PCI_CAP_ID_VPD Vital Product Data |
| 155 | * %PCI_CAP_ID_SLOTID Slot Identification |
| 156 | * %PCI_CAP_ID_MSI Message Signalled Interrupts |
| 157 | * %PCI_CAP_ID_CHSWP CompactPCI HotSwap |
| 158 | * %PCI_CAP_ID_PCIX PCI-X |
| 159 | * %PCI_CAP_ID_EXP PCI Express |
| 160 | */ |
| 161 | int pci_find_capability(struct pci_dev *dev, int cap) |
| 162 | { |
Michael Ellerman | d3bac11 | 2006-11-22 18:26:16 +1100 | [diff] [blame] | 163 | int pos; |
| 164 | |
| 165 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); |
| 166 | if (pos) |
| 167 | pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap); |
| 168 | |
| 169 | return pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | /** |
| 173 | * pci_bus_find_capability - query for devices' capabilities |
| 174 | * @bus: the PCI bus to query |
| 175 | * @devfn: PCI device to query |
| 176 | * @cap: capability code |
| 177 | * |
| 178 | * Like pci_find_capability() but works for pci devices that do not have a |
| 179 | * pci_dev structure set up yet. |
| 180 | * |
| 181 | * Returns the address of the requested capability structure within the |
| 182 | * device's PCI configuration space or 0 in case the device does not |
| 183 | * support it. |
| 184 | */ |
| 185 | int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap) |
| 186 | { |
Michael Ellerman | d3bac11 | 2006-11-22 18:26:16 +1100 | [diff] [blame] | 187 | int pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | u8 hdr_type; |
| 189 | |
| 190 | pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type); |
| 191 | |
Michael Ellerman | d3bac11 | 2006-11-22 18:26:16 +1100 | [diff] [blame] | 192 | pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f); |
| 193 | if (pos) |
| 194 | pos = __pci_find_next_cap(bus, devfn, pos, cap); |
| 195 | |
| 196 | return pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | /** |
| 200 | * pci_find_ext_capability - Find an extended capability |
| 201 | * @dev: PCI device to query |
| 202 | * @cap: capability code |
| 203 | * |
| 204 | * Returns the address of the requested extended capability structure |
| 205 | * within the device's PCI configuration space or 0 if the device does |
| 206 | * not support it. Possible values for @cap: |
| 207 | * |
| 208 | * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting |
| 209 | * %PCI_EXT_CAP_ID_VC Virtual Channel |
| 210 | * %PCI_EXT_CAP_ID_DSN Device Serial Number |
| 211 | * %PCI_EXT_CAP_ID_PWR Power Budgeting |
| 212 | */ |
| 213 | int pci_find_ext_capability(struct pci_dev *dev, int cap) |
| 214 | { |
| 215 | u32 header; |
| 216 | int ttl = 480; /* 3840 bytes, minimum 8 bytes per capability */ |
| 217 | int pos = 0x100; |
| 218 | |
| 219 | if (dev->cfg_size <= 256) |
| 220 | return 0; |
| 221 | |
| 222 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) |
| 223 | return 0; |
| 224 | |
| 225 | /* |
| 226 | * If we have no capabilities, this is indicated by cap ID, |
| 227 | * cap version and next pointer all being 0. |
| 228 | */ |
| 229 | if (header == 0) |
| 230 | return 0; |
| 231 | |
| 232 | while (ttl-- > 0) { |
| 233 | if (PCI_EXT_CAP_ID(header) == cap) |
| 234 | return pos; |
| 235 | |
| 236 | pos = PCI_EXT_CAP_NEXT(header); |
| 237 | if (pos < 0x100) |
| 238 | break; |
| 239 | |
| 240 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) |
| 241 | break; |
| 242 | } |
| 243 | |
| 244 | return 0; |
| 245 | } |
Brice Goglin | 3a720d7 | 2006-05-23 06:10:01 -0400 | [diff] [blame] | 246 | EXPORT_SYMBOL_GPL(pci_find_ext_capability); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Michael Ellerman | 687d5fe | 2006-11-22 18:26:18 +1100 | [diff] [blame] | 248 | static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap) |
| 249 | { |
| 250 | int rc, ttl = PCI_FIND_CAP_TTL; |
| 251 | u8 cap, mask; |
| 252 | |
| 253 | if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST) |
| 254 | mask = HT_3BIT_CAP_MASK; |
| 255 | else |
| 256 | mask = HT_5BIT_CAP_MASK; |
| 257 | |
| 258 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos, |
| 259 | PCI_CAP_ID_HT, &ttl); |
| 260 | while (pos) { |
| 261 | rc = pci_read_config_byte(dev, pos + 3, &cap); |
| 262 | if (rc != PCIBIOS_SUCCESSFUL) |
| 263 | return 0; |
| 264 | |
| 265 | if ((cap & mask) == ht_cap) |
| 266 | return pos; |
| 267 | |
Brice Goglin | 47a4d5b | 2007-01-10 23:15:29 -0800 | [diff] [blame] | 268 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, |
| 269 | pos + PCI_CAP_LIST_NEXT, |
Michael Ellerman | 687d5fe | 2006-11-22 18:26:18 +1100 | [diff] [blame] | 270 | PCI_CAP_ID_HT, &ttl); |
| 271 | } |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | /** |
| 276 | * pci_find_next_ht_capability - query a device's Hypertransport capabilities |
| 277 | * @dev: PCI device to query |
| 278 | * @pos: Position from which to continue searching |
| 279 | * @ht_cap: Hypertransport capability code |
| 280 | * |
| 281 | * To be used in conjunction with pci_find_ht_capability() to search for |
| 282 | * all capabilities matching @ht_cap. @pos should always be a value returned |
| 283 | * from pci_find_ht_capability(). |
| 284 | * |
| 285 | * NB. To be 100% safe against broken PCI devices, the caller should take |
| 286 | * steps to avoid an infinite loop. |
| 287 | */ |
| 288 | int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap) |
| 289 | { |
| 290 | return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap); |
| 291 | } |
| 292 | EXPORT_SYMBOL_GPL(pci_find_next_ht_capability); |
| 293 | |
| 294 | /** |
| 295 | * pci_find_ht_capability - query a device's Hypertransport capabilities |
| 296 | * @dev: PCI device to query |
| 297 | * @ht_cap: Hypertransport capability code |
| 298 | * |
| 299 | * Tell if a device supports a given Hypertransport capability. |
| 300 | * Returns an address within the device's PCI configuration space |
| 301 | * or 0 in case the device does not support the request capability. |
| 302 | * The address points to the PCI capability, of type PCI_CAP_ID_HT, |
| 303 | * which has a Hypertransport capability matching @ht_cap. |
| 304 | */ |
| 305 | int pci_find_ht_capability(struct pci_dev *dev, int ht_cap) |
| 306 | { |
| 307 | int pos; |
| 308 | |
| 309 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); |
| 310 | if (pos) |
| 311 | pos = __pci_find_next_ht_cap(dev, pos, ht_cap); |
| 312 | |
| 313 | return pos; |
| 314 | } |
| 315 | EXPORT_SYMBOL_GPL(pci_find_ht_capability); |
| 316 | |
Shaohua Li | 4348a2d | 2007-10-24 10:45:08 +0800 | [diff] [blame] | 317 | void pcie_wait_pending_transaction(struct pci_dev *dev) |
| 318 | { |
| 319 | int pos; |
| 320 | u16 reg16; |
| 321 | |
| 322 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); |
| 323 | if (!pos) |
| 324 | return; |
| 325 | while (1) { |
| 326 | pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, ®16); |
| 327 | if (!(reg16 & PCI_EXP_DEVSTA_TRPND)) |
| 328 | break; |
| 329 | cpu_relax(); |
| 330 | } |
| 331 | |
| 332 | } |
| 333 | EXPORT_SYMBOL_GPL(pcie_wait_pending_transaction); |
| 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | /** |
| 336 | * pci_find_parent_resource - return resource region of parent bus of given region |
| 337 | * @dev: PCI device structure contains resources to be searched |
| 338 | * @res: child resource record for which parent is sought |
| 339 | * |
| 340 | * For given resource region of given device, return the resource |
| 341 | * region of parent bus the given region is contained in or where |
| 342 | * it should be allocated from. |
| 343 | */ |
| 344 | struct resource * |
| 345 | pci_find_parent_resource(const struct pci_dev *dev, struct resource *res) |
| 346 | { |
| 347 | const struct pci_bus *bus = dev->bus; |
| 348 | int i; |
| 349 | struct resource *best = NULL; |
| 350 | |
| 351 | for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { |
| 352 | struct resource *r = bus->resource[i]; |
| 353 | if (!r) |
| 354 | continue; |
| 355 | if (res->start && !(res->start >= r->start && res->end <= r->end)) |
| 356 | continue; /* Not contained */ |
| 357 | if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM)) |
| 358 | continue; /* Wrong type */ |
| 359 | if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH)) |
| 360 | return r; /* Exact match */ |
| 361 | if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH)) |
| 362 | best = r; /* Approximating prefetchable by non-prefetchable */ |
| 363 | } |
| 364 | return best; |
| 365 | } |
| 366 | |
| 367 | /** |
John W. Linville | 064b53d | 2005-07-27 10:19:44 -0400 | [diff] [blame] | 368 | * pci_restore_bars - restore a devices BAR values (e.g. after wake-up) |
| 369 | * @dev: PCI device to have its BARs restored |
| 370 | * |
| 371 | * Restore the BAR values for a given device, so as to make it |
| 372 | * accessible by its driver. |
| 373 | */ |
Adrian Bunk | ad66859 | 2007-10-27 03:06:22 +0200 | [diff] [blame] | 374 | static void |
John W. Linville | 064b53d | 2005-07-27 10:19:44 -0400 | [diff] [blame] | 375 | pci_restore_bars(struct pci_dev *dev) |
| 376 | { |
| 377 | int i, numres; |
| 378 | |
| 379 | switch (dev->hdr_type) { |
| 380 | case PCI_HEADER_TYPE_NORMAL: |
| 381 | numres = 6; |
| 382 | break; |
| 383 | case PCI_HEADER_TYPE_BRIDGE: |
| 384 | numres = 2; |
| 385 | break; |
| 386 | case PCI_HEADER_TYPE_CARDBUS: |
| 387 | numres = 1; |
| 388 | break; |
| 389 | default: |
| 390 | /* Should never get here, but just in case... */ |
| 391 | return; |
| 392 | } |
| 393 | |
| 394 | for (i = 0; i < numres; i ++) |
| 395 | pci_update_resource(dev, &dev->resource[i], i); |
| 396 | } |
| 397 | |
Randy Dunlap | 8f7020d | 2005-10-23 11:57:38 -0700 | [diff] [blame] | 398 | int (*platform_pci_set_power_state)(struct pci_dev *dev, pci_power_t t); |
| 399 | |
John W. Linville | 064b53d | 2005-07-27 10:19:44 -0400 | [diff] [blame] | 400 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | * pci_set_power_state - Set the power state of a PCI device |
| 402 | * @dev: PCI device to be suspended |
| 403 | * @state: PCI power state (D0, D1, D2, D3hot, D3cold) we're entering |
| 404 | * |
| 405 | * Transition a device to a new power state, using the Power Management |
| 406 | * Capabilities in the device's config space. |
| 407 | * |
| 408 | * RETURN VALUE: |
| 409 | * -EINVAL if trying to enter a lower state than we're already in. |
| 410 | * 0 if we're already in the requested state. |
| 411 | * -EIO if device does not support PCI PM. |
| 412 | * 0 if we can successfully change the power state. |
| 413 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | int |
| 415 | pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
| 416 | { |
John W. Linville | 064b53d | 2005-07-27 10:19:44 -0400 | [diff] [blame] | 417 | int pm, need_restore = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | u16 pmcsr, pmc; |
| 419 | |
| 420 | /* bound the state we're entering */ |
| 421 | if (state > PCI_D3hot) |
| 422 | state = PCI_D3hot; |
| 423 | |
Pavel Machek | e36c455 | 2007-01-16 12:17:13 +0100 | [diff] [blame] | 424 | /* |
| 425 | * If the device or the parent bridge can't support PCI PM, ignore |
| 426 | * the request if we're doing anything besides putting it into D0 |
| 427 | * (which would only happen on boot). |
| 428 | */ |
| 429 | if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) |
| 430 | return 0; |
| 431 | |
Andrew Lunn | cca03de | 2007-07-09 11:55:58 -0700 | [diff] [blame] | 432 | /* find PCI PM capability in list */ |
| 433 | pm = pci_find_capability(dev, PCI_CAP_ID_PM); |
| 434 | |
| 435 | /* abort if the device doesn't support PM capabilities */ |
| 436 | if (!pm) |
| 437 | return -EIO; |
| 438 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | /* Validate current state: |
| 440 | * Can enter D0 from any state, but if we can only go deeper |
| 441 | * to sleep if we're already in a low power state |
| 442 | */ |
Andrew Morton | 0266949 | 2006-03-23 01:38:34 -0800 | [diff] [blame] | 443 | if (state != PCI_D0 && dev->current_state > state) { |
| 444 | printk(KERN_ERR "%s(): %s: state=%d, current state=%d\n", |
| 445 | __FUNCTION__, pci_name(dev), state, dev->current_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | return -EINVAL; |
Andrew Morton | 0266949 | 2006-03-23 01:38:34 -0800 | [diff] [blame] | 447 | } else if (dev->current_state == state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | return 0; /* we're already there */ |
| 449 | |
Kristen Carlson Accardi | ffadcc2 | 2006-07-12 08:59:00 -0700 | [diff] [blame] | 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | pci_read_config_word(dev,pm + PCI_PM_PMC,&pmc); |
Daniel Ritz | 3fe9d19 | 2005-08-17 15:32:19 -0700 | [diff] [blame] | 452 | if ((pmc & PCI_PM_CAP_VER_MASK) > 3) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | printk(KERN_DEBUG |
| 454 | "PCI: %s has unsupported PM cap regs version (%u)\n", |
| 455 | pci_name(dev), pmc & PCI_PM_CAP_VER_MASK); |
| 456 | return -EIO; |
| 457 | } |
| 458 | |
| 459 | /* check if this device supports the desired state */ |
Daniel Ritz | 3fe9d19 | 2005-08-17 15:32:19 -0700 | [diff] [blame] | 460 | if (state == PCI_D1 && !(pmc & PCI_PM_CAP_D1)) |
| 461 | return -EIO; |
| 462 | else if (state == PCI_D2 && !(pmc & PCI_PM_CAP_D2)) |
| 463 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
John W. Linville | 064b53d | 2005-07-27 10:19:44 -0400 | [diff] [blame] | 465 | pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr); |
| 466 | |
John W. Linville | 32a3658 | 2005-09-14 09:52:42 -0400 | [diff] [blame] | 467 | /* If we're (effectively) in D3, force entire word to 0. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | * This doesn't affect PME_Status, disables PME_En, and |
| 469 | * sets PowerState to 0. |
| 470 | */ |
John W. Linville | 32a3658 | 2005-09-14 09:52:42 -0400 | [diff] [blame] | 471 | switch (dev->current_state) { |
John W. Linville | d3535fb | 2005-09-28 17:50:51 -0400 | [diff] [blame] | 472 | case PCI_D0: |
| 473 | case PCI_D1: |
| 474 | case PCI_D2: |
| 475 | pmcsr &= ~PCI_PM_CTRL_STATE_MASK; |
| 476 | pmcsr |= state; |
| 477 | break; |
John W. Linville | 32a3658 | 2005-09-14 09:52:42 -0400 | [diff] [blame] | 478 | case PCI_UNKNOWN: /* Boot-up */ |
| 479 | if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot |
| 480 | && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) |
John W. Linville | 064b53d | 2005-07-27 10:19:44 -0400 | [diff] [blame] | 481 | need_restore = 1; |
John W. Linville | 32a3658 | 2005-09-14 09:52:42 -0400 | [diff] [blame] | 482 | /* Fall-through: force to D0 */ |
John W. Linville | 32a3658 | 2005-09-14 09:52:42 -0400 | [diff] [blame] | 483 | default: |
John W. Linville | d3535fb | 2005-09-28 17:50:51 -0400 | [diff] [blame] | 484 | pmcsr = 0; |
John W. Linville | 32a3658 | 2005-09-14 09:52:42 -0400 | [diff] [blame] | 485 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | /* enter specified state */ |
| 489 | pci_write_config_word(dev, pm + PCI_PM_CTRL, pmcsr); |
| 490 | |
| 491 | /* Mandatory power management transition delays */ |
| 492 | /* see PCI PM 1.1 5.6.1 table 18 */ |
| 493 | if (state == PCI_D3hot || dev->current_state == PCI_D3hot) |
Kristen Carlson Accardi | ffadcc2 | 2006-07-12 08:59:00 -0700 | [diff] [blame] | 494 | msleep(pci_pm_d3_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | else if (state == PCI_D2 || dev->current_state == PCI_D2) |
| 496 | udelay(200); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 498 | /* |
| 499 | * Give firmware a chance to be called, such as ACPI _PRx, _PSx |
Andreas Mohr | d6e05ed | 2006-06-26 18:35:02 +0200 | [diff] [blame] | 500 | * Firmware method after native method ? |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 501 | */ |
| 502 | if (platform_pci_set_power_state) |
| 503 | platform_pci_set_power_state(dev, state); |
| 504 | |
| 505 | dev->current_state = state; |
John W. Linville | 064b53d | 2005-07-27 10:19:44 -0400 | [diff] [blame] | 506 | |
| 507 | /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT |
| 508 | * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning |
| 509 | * from D3hot to D0 _may_ perform an internal reset, thereby |
| 510 | * going to "D0 Uninitialized" rather than "D0 Initialized". |
| 511 | * For example, at least some versions of the 3c905B and the |
| 512 | * 3c556B exhibit this behaviour. |
| 513 | * |
| 514 | * At least some laptop BIOSen (e.g. the Thinkpad T21) leave |
| 515 | * devices in a D3hot state at boot. Consequently, we need to |
| 516 | * restore at least the BARs so that the device will be |
| 517 | * accessible to its driver. |
| 518 | */ |
| 519 | if (need_restore) |
| 520 | pci_restore_bars(dev); |
| 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | return 0; |
| 523 | } |
| 524 | |
Shaohua Li | ab826ca | 2007-07-20 10:03:22 +0800 | [diff] [blame] | 525 | pci_power_t (*platform_pci_choose_state)(struct pci_dev *dev, pm_message_t state); |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | /** |
| 528 | * pci_choose_state - Choose the power state of a PCI device |
| 529 | * @dev: PCI device to be suspended |
| 530 | * @state: target sleep state for the whole system. This is the value |
| 531 | * that is passed to suspend() function. |
| 532 | * |
| 533 | * Returns PCI power state suitable for given device and given system |
| 534 | * message. |
| 535 | */ |
| 536 | |
| 537 | pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state) |
| 538 | { |
Shaohua Li | ab826ca | 2007-07-20 10:03:22 +0800 | [diff] [blame] | 539 | pci_power_t ret; |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 540 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | if (!pci_find_capability(dev, PCI_CAP_ID_PM)) |
| 542 | return PCI_D0; |
| 543 | |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 544 | if (platform_pci_choose_state) { |
| 545 | ret = platform_pci_choose_state(dev, state); |
Shaohua Li | ab826ca | 2007-07-20 10:03:22 +0800 | [diff] [blame] | 546 | if (ret != PCI_POWER_ERROR) |
| 547 | return ret; |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 548 | } |
Pavel Machek | ca078ba | 2005-09-03 15:56:57 -0700 | [diff] [blame] | 549 | |
| 550 | switch (state.event) { |
| 551 | case PM_EVENT_ON: |
| 552 | return PCI_D0; |
| 553 | case PM_EVENT_FREEZE: |
David Brownell | b887d2e | 2006-08-14 23:11:05 -0700 | [diff] [blame] | 554 | case PM_EVENT_PRETHAW: |
| 555 | /* REVISIT both freeze and pre-thaw "should" use D0 */ |
Pavel Machek | ca078ba | 2005-09-03 15:56:57 -0700 | [diff] [blame] | 556 | case PM_EVENT_SUSPEND: |
| 557 | return PCI_D3hot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | default: |
David Brownell | b887d2e | 2006-08-14 23:11:05 -0700 | [diff] [blame] | 559 | printk("Unrecognized suspend event %d\n", state.event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | BUG(); |
| 561 | } |
| 562 | return PCI_D0; |
| 563 | } |
| 564 | |
| 565 | EXPORT_SYMBOL(pci_choose_state); |
| 566 | |
Michael S. Tsirkin | b56a5a2 | 2006-08-21 16:22:22 +0300 | [diff] [blame] | 567 | static int pci_save_pcie_state(struct pci_dev *dev) |
| 568 | { |
| 569 | int pos, i = 0; |
| 570 | struct pci_cap_saved_state *save_state; |
| 571 | u16 *cap; |
Shaohua Li | 017fc48 | 2007-12-18 09:57:09 +0800 | [diff] [blame] | 572 | int found = 0; |
Michael S. Tsirkin | b56a5a2 | 2006-08-21 16:22:22 +0300 | [diff] [blame] | 573 | |
| 574 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); |
| 575 | if (pos <= 0) |
| 576 | return 0; |
| 577 | |
Eric W. Biederman | 9f35575 | 2007-03-08 13:06:13 -0700 | [diff] [blame] | 578 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); |
| 579 | if (!save_state) |
| 580 | save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL); |
Shaohua Li | 017fc48 | 2007-12-18 09:57:09 +0800 | [diff] [blame] | 581 | else |
| 582 | found = 1; |
Michael S. Tsirkin | b56a5a2 | 2006-08-21 16:22:22 +0300 | [diff] [blame] | 583 | if (!save_state) { |
| 584 | dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n"); |
| 585 | return -ENOMEM; |
| 586 | } |
| 587 | cap = (u16 *)&save_state->data[0]; |
| 588 | |
| 589 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]); |
| 590 | pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]); |
| 591 | pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]); |
| 592 | pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]); |
Shaohua Li | ec0a3a2 | 2007-12-18 09:56:56 +0800 | [diff] [blame] | 593 | save_state->cap_nr = PCI_CAP_ID_EXP; |
Shaohua Li | 017fc48 | 2007-12-18 09:57:09 +0800 | [diff] [blame] | 594 | if (!found) |
| 595 | pci_add_saved_cap(dev, save_state); |
Michael S. Tsirkin | b56a5a2 | 2006-08-21 16:22:22 +0300 | [diff] [blame] | 596 | return 0; |
| 597 | } |
| 598 | |
| 599 | static void pci_restore_pcie_state(struct pci_dev *dev) |
| 600 | { |
| 601 | int i = 0, pos; |
| 602 | struct pci_cap_saved_state *save_state; |
| 603 | u16 *cap; |
| 604 | |
| 605 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); |
| 606 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); |
| 607 | if (!save_state || pos <= 0) |
| 608 | return; |
| 609 | cap = (u16 *)&save_state->data[0]; |
| 610 | |
| 611 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]); |
| 612 | pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]); |
| 613 | pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]); |
| 614 | pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]); |
Michael S. Tsirkin | b56a5a2 | 2006-08-21 16:22:22 +0300 | [diff] [blame] | 615 | } |
| 616 | |
Stephen Hemminger | cc692a5 | 2006-11-08 16:17:15 -0800 | [diff] [blame] | 617 | |
| 618 | static int pci_save_pcix_state(struct pci_dev *dev) |
| 619 | { |
| 620 | int pos, i = 0; |
| 621 | struct pci_cap_saved_state *save_state; |
| 622 | u16 *cap; |
Shaohua Li | 017fc48 | 2007-12-18 09:57:09 +0800 | [diff] [blame] | 623 | int found = 0; |
Stephen Hemminger | cc692a5 | 2006-11-08 16:17:15 -0800 | [diff] [blame] | 624 | |
| 625 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| 626 | if (pos <= 0) |
| 627 | return 0; |
| 628 | |
Shaohua Li | f34303d | 2007-12-18 09:56:47 +0800 | [diff] [blame] | 629 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); |
Eric W. Biederman | 9f35575 | 2007-03-08 13:06:13 -0700 | [diff] [blame] | 630 | if (!save_state) |
| 631 | save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL); |
Shaohua Li | 017fc48 | 2007-12-18 09:57:09 +0800 | [diff] [blame] | 632 | else |
| 633 | found = 1; |
Stephen Hemminger | cc692a5 | 2006-11-08 16:17:15 -0800 | [diff] [blame] | 634 | if (!save_state) { |
| 635 | dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n"); |
| 636 | return -ENOMEM; |
| 637 | } |
| 638 | cap = (u16 *)&save_state->data[0]; |
| 639 | |
| 640 | pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]); |
Shaohua Li | ec0a3a2 | 2007-12-18 09:56:56 +0800 | [diff] [blame] | 641 | save_state->cap_nr = PCI_CAP_ID_PCIX; |
Shaohua Li | 017fc48 | 2007-12-18 09:57:09 +0800 | [diff] [blame] | 642 | if (!found) |
| 643 | pci_add_saved_cap(dev, save_state); |
Stephen Hemminger | cc692a5 | 2006-11-08 16:17:15 -0800 | [diff] [blame] | 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | static void pci_restore_pcix_state(struct pci_dev *dev) |
| 648 | { |
| 649 | int i = 0, pos; |
| 650 | struct pci_cap_saved_state *save_state; |
| 651 | u16 *cap; |
| 652 | |
| 653 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); |
| 654 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| 655 | if (!save_state || pos <= 0) |
| 656 | return; |
| 657 | cap = (u16 *)&save_state->data[0]; |
| 658 | |
| 659 | pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]); |
Stephen Hemminger | cc692a5 | 2006-11-08 16:17:15 -0800 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | /** |
| 664 | * pci_save_state - save the PCI configuration space of a device before suspending |
| 665 | * @dev: - PCI device that we're dealing with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | */ |
| 667 | int |
| 668 | pci_save_state(struct pci_dev *dev) |
| 669 | { |
| 670 | int i; |
| 671 | /* XXX: 100% dword access ok here? */ |
| 672 | for (i = 0; i < 16; i++) |
| 673 | pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]); |
Michael S. Tsirkin | b56a5a2 | 2006-08-21 16:22:22 +0300 | [diff] [blame] | 674 | if ((i = pci_save_pcie_state(dev)) != 0) |
| 675 | return i; |
Stephen Hemminger | cc692a5 | 2006-11-08 16:17:15 -0800 | [diff] [blame] | 676 | if ((i = pci_save_pcix_state(dev)) != 0) |
| 677 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | return 0; |
| 679 | } |
| 680 | |
| 681 | /** |
| 682 | * pci_restore_state - Restore the saved state of a PCI device |
| 683 | * @dev: - PCI device that we're dealing with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | */ |
| 685 | int |
| 686 | pci_restore_state(struct pci_dev *dev) |
| 687 | { |
| 688 | int i; |
Al Viro | b4482a4 | 2007-10-14 19:35:40 +0100 | [diff] [blame] | 689 | u32 val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Michael S. Tsirkin | b56a5a2 | 2006-08-21 16:22:22 +0300 | [diff] [blame] | 691 | /* PCI Express register must be restored first */ |
| 692 | pci_restore_pcie_state(dev); |
| 693 | |
Yu, Luming | 8b8c8d2 | 2006-04-25 00:00:34 -0700 | [diff] [blame] | 694 | /* |
| 695 | * The Base Address register should be programmed before the command |
| 696 | * register(s) |
| 697 | */ |
| 698 | for (i = 15; i >= 0; i--) { |
Dave Jones | 04d9c1a | 2006-04-18 21:06:51 -0700 | [diff] [blame] | 699 | pci_read_config_dword(dev, i * 4, &val); |
| 700 | if (val != dev->saved_config_space[i]) { |
| 701 | printk(KERN_DEBUG "PM: Writing back config space on " |
| 702 | "device %s at offset %x (was %x, writing %x)\n", |
| 703 | pci_name(dev), i, |
| 704 | val, (int)dev->saved_config_space[i]); |
| 705 | pci_write_config_dword(dev,i * 4, |
| 706 | dev->saved_config_space[i]); |
| 707 | } |
| 708 | } |
Stephen Hemminger | cc692a5 | 2006-11-08 16:17:15 -0800 | [diff] [blame] | 709 | pci_restore_pcix_state(dev); |
Shaohua Li | 41017f0 | 2006-02-08 17:11:38 +0800 | [diff] [blame] | 710 | pci_restore_msi_state(dev); |
Michael Ellerman | 8fed4b6 | 2007-01-25 19:34:08 +1100 | [diff] [blame] | 711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | return 0; |
| 713 | } |
| 714 | |
Hidetoshi Seto | 38cc130 | 2006-12-18 10:30:00 +0900 | [diff] [blame] | 715 | static int do_pci_enable_device(struct pci_dev *dev, int bars) |
| 716 | { |
| 717 | int err; |
| 718 | |
| 719 | err = pci_set_power_state(dev, PCI_D0); |
| 720 | if (err < 0 && err != -EIO) |
| 721 | return err; |
| 722 | err = pcibios_enable_device(dev, bars); |
| 723 | if (err < 0) |
| 724 | return err; |
| 725 | pci_fixup_device(pci_fixup_enable, dev); |
| 726 | |
| 727 | return 0; |
| 728 | } |
| 729 | |
| 730 | /** |
Tejun Heo | 0b62e13 | 2007-07-27 14:43:35 +0900 | [diff] [blame] | 731 | * pci_reenable_device - Resume abandoned device |
Hidetoshi Seto | 38cc130 | 2006-12-18 10:30:00 +0900 | [diff] [blame] | 732 | * @dev: PCI device to be resumed |
| 733 | * |
| 734 | * Note this function is a backend of pci_default_resume and is not supposed |
| 735 | * to be called by normal code, write proper resume handler and use it instead. |
| 736 | */ |
Tejun Heo | 0b62e13 | 2007-07-27 14:43:35 +0900 | [diff] [blame] | 737 | int pci_reenable_device(struct pci_dev *dev) |
Hidetoshi Seto | 38cc130 | 2006-12-18 10:30:00 +0900 | [diff] [blame] | 738 | { |
| 739 | if (atomic_read(&dev->enable_cnt)) |
| 740 | return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1); |
| 741 | return 0; |
| 742 | } |
| 743 | |
Benjamin Herrenschmidt | b718989 | 2007-12-20 15:28:08 +1100 | [diff] [blame] | 744 | static int __pci_enable_device_flags(struct pci_dev *dev, |
| 745 | resource_size_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | { |
| 747 | int err; |
Benjamin Herrenschmidt | b718989 | 2007-12-20 15:28:08 +1100 | [diff] [blame] | 748 | int i, bars = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Hidetoshi Seto | 9fb625c | 2006-12-18 10:28:43 +0900 | [diff] [blame] | 750 | if (atomic_add_return(1, &dev->enable_cnt) > 1) |
| 751 | return 0; /* already enabled */ |
| 752 | |
Benjamin Herrenschmidt | b718989 | 2007-12-20 15:28:08 +1100 | [diff] [blame] | 753 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) |
| 754 | if (dev->resource[i].flags & flags) |
| 755 | bars |= (1 << i); |
| 756 | |
Hidetoshi Seto | 38cc130 | 2006-12-18 10:30:00 +0900 | [diff] [blame] | 757 | err = do_pci_enable_device(dev, bars); |
Greg Kroah-Hartman | 95a6296 | 2005-07-28 11:37:33 -0700 | [diff] [blame] | 758 | if (err < 0) |
Hidetoshi Seto | 38cc130 | 2006-12-18 10:30:00 +0900 | [diff] [blame] | 759 | atomic_dec(&dev->enable_cnt); |
Hidetoshi Seto | 9fb625c | 2006-12-18 10:28:43 +0900 | [diff] [blame] | 760 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | } |
| 762 | |
| 763 | /** |
Benjamin Herrenschmidt | b718989 | 2007-12-20 15:28:08 +1100 | [diff] [blame] | 764 | * pci_enable_device_io - Initialize a device for use with IO space |
| 765 | * @dev: PCI device to be initialized |
| 766 | * |
| 767 | * Initialize device before it's used by a driver. Ask low-level code |
| 768 | * to enable I/O resources. Wake up the device if it was suspended. |
| 769 | * Beware, this function can fail. |
| 770 | */ |
| 771 | int pci_enable_device_io(struct pci_dev *dev) |
| 772 | { |
| 773 | return __pci_enable_device_flags(dev, IORESOURCE_IO); |
| 774 | } |
| 775 | |
| 776 | /** |
| 777 | * pci_enable_device_mem - Initialize a device for use with Memory space |
| 778 | * @dev: PCI device to be initialized |
| 779 | * |
| 780 | * Initialize device before it's used by a driver. Ask low-level code |
| 781 | * to enable Memory resources. Wake up the device if it was suspended. |
| 782 | * Beware, this function can fail. |
| 783 | */ |
| 784 | int pci_enable_device_mem(struct pci_dev *dev) |
| 785 | { |
| 786 | return __pci_enable_device_flags(dev, IORESOURCE_MEM); |
| 787 | } |
| 788 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | /** |
| 790 | * pci_enable_device - Initialize device before it's used by a driver. |
| 791 | * @dev: PCI device to be initialized |
| 792 | * |
| 793 | * Initialize device before it's used by a driver. Ask low-level code |
| 794 | * to enable I/O and memory. Wake up the device if it was suspended. |
| 795 | * Beware, this function can fail. |
Inaky Perez-Gonzalez | bae94d0 | 2006-11-22 12:40:31 -0800 | [diff] [blame] | 796 | * |
| 797 | * Note we don't actually enable the device many times if we call |
| 798 | * this function repeatedly (we just increment the count). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | */ |
Inaky Perez-Gonzalez | bae94d0 | 2006-11-22 12:40:31 -0800 | [diff] [blame] | 800 | int pci_enable_device(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | { |
Benjamin Herrenschmidt | b718989 | 2007-12-20 15:28:08 +1100 | [diff] [blame] | 802 | return __pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | } |
| 804 | |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 805 | /* |
| 806 | * Managed PCI resources. This manages device on/off, intx/msi/msix |
| 807 | * on/off and BAR regions. pci_dev itself records msi/msix status, so |
| 808 | * there's no need to track it separately. pci_devres is initialized |
| 809 | * when a device is enabled using managed PCI device enable interface. |
| 810 | */ |
| 811 | struct pci_devres { |
Tejun Heo | 7f375f3 | 2007-02-25 04:36:01 -0800 | [diff] [blame] | 812 | unsigned int enabled:1; |
| 813 | unsigned int pinned:1; |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 814 | unsigned int orig_intx:1; |
| 815 | unsigned int restore_intx:1; |
| 816 | u32 region_mask; |
| 817 | }; |
| 818 | |
| 819 | static void pcim_release(struct device *gendev, void *res) |
| 820 | { |
| 821 | struct pci_dev *dev = container_of(gendev, struct pci_dev, dev); |
| 822 | struct pci_devres *this = res; |
| 823 | int i; |
| 824 | |
| 825 | if (dev->msi_enabled) |
| 826 | pci_disable_msi(dev); |
| 827 | if (dev->msix_enabled) |
| 828 | pci_disable_msix(dev); |
| 829 | |
| 830 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) |
| 831 | if (this->region_mask & (1 << i)) |
| 832 | pci_release_region(dev, i); |
| 833 | |
| 834 | if (this->restore_intx) |
| 835 | pci_intx(dev, this->orig_intx); |
| 836 | |
Tejun Heo | 7f375f3 | 2007-02-25 04:36:01 -0800 | [diff] [blame] | 837 | if (this->enabled && !this->pinned) |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 838 | pci_disable_device(dev); |
| 839 | } |
| 840 | |
| 841 | static struct pci_devres * get_pci_dr(struct pci_dev *pdev) |
| 842 | { |
| 843 | struct pci_devres *dr, *new_dr; |
| 844 | |
| 845 | dr = devres_find(&pdev->dev, pcim_release, NULL, NULL); |
| 846 | if (dr) |
| 847 | return dr; |
| 848 | |
| 849 | new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL); |
| 850 | if (!new_dr) |
| 851 | return NULL; |
| 852 | return devres_get(&pdev->dev, new_dr, NULL, NULL); |
| 853 | } |
| 854 | |
| 855 | static struct pci_devres * find_pci_dr(struct pci_dev *pdev) |
| 856 | { |
| 857 | if (pci_is_managed(pdev)) |
| 858 | return devres_find(&pdev->dev, pcim_release, NULL, NULL); |
| 859 | return NULL; |
| 860 | } |
| 861 | |
| 862 | /** |
| 863 | * pcim_enable_device - Managed pci_enable_device() |
| 864 | * @pdev: PCI device to be initialized |
| 865 | * |
| 866 | * Managed pci_enable_device(). |
| 867 | */ |
| 868 | int pcim_enable_device(struct pci_dev *pdev) |
| 869 | { |
| 870 | struct pci_devres *dr; |
| 871 | int rc; |
| 872 | |
| 873 | dr = get_pci_dr(pdev); |
| 874 | if (unlikely(!dr)) |
| 875 | return -ENOMEM; |
Tejun Heo | b95d58e | 2008-01-30 18:20:04 +0900 | [diff] [blame] | 876 | if (dr->enabled) |
| 877 | return 0; |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 878 | |
| 879 | rc = pci_enable_device(pdev); |
| 880 | if (!rc) { |
| 881 | pdev->is_managed = 1; |
Tejun Heo | 7f375f3 | 2007-02-25 04:36:01 -0800 | [diff] [blame] | 882 | dr->enabled = 1; |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 883 | } |
| 884 | return rc; |
| 885 | } |
| 886 | |
| 887 | /** |
| 888 | * pcim_pin_device - Pin managed PCI device |
| 889 | * @pdev: PCI device to pin |
| 890 | * |
| 891 | * Pin managed PCI device @pdev. Pinned device won't be disabled on |
| 892 | * driver detach. @pdev must have been enabled with |
| 893 | * pcim_enable_device(). |
| 894 | */ |
| 895 | void pcim_pin_device(struct pci_dev *pdev) |
| 896 | { |
| 897 | struct pci_devres *dr; |
| 898 | |
| 899 | dr = find_pci_dr(pdev); |
Tejun Heo | 7f375f3 | 2007-02-25 04:36:01 -0800 | [diff] [blame] | 900 | WARN_ON(!dr || !dr->enabled); |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 901 | if (dr) |
Tejun Heo | 7f375f3 | 2007-02-25 04:36:01 -0800 | [diff] [blame] | 902 | dr->pinned = 1; |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 903 | } |
| 904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | /** |
| 906 | * pcibios_disable_device - disable arch specific PCI resources for device dev |
| 907 | * @dev: the PCI device to disable |
| 908 | * |
| 909 | * Disables architecture specific PCI resources for the device. This |
| 910 | * is the default implementation. Architecture implementations can |
| 911 | * override this. |
| 912 | */ |
| 913 | void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {} |
| 914 | |
| 915 | /** |
| 916 | * pci_disable_device - Disable PCI device after use |
| 917 | * @dev: PCI device to be disabled |
| 918 | * |
| 919 | * Signal to the system that the PCI device is not in use by the system |
| 920 | * anymore. This only involves disabling PCI bus-mastering, if active. |
Inaky Perez-Gonzalez | bae94d0 | 2006-11-22 12:40:31 -0800 | [diff] [blame] | 921 | * |
| 922 | * Note we don't actually disable the device until all callers of |
| 923 | * pci_device_enable() have called pci_device_disable(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | */ |
| 925 | void |
| 926 | pci_disable_device(struct pci_dev *dev) |
| 927 | { |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 928 | struct pci_devres *dr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | u16 pci_command; |
Shaohua Li | 99dc804 | 2006-05-26 10:58:27 +0800 | [diff] [blame] | 930 | |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 931 | dr = find_pci_dr(dev); |
| 932 | if (dr) |
Tejun Heo | 7f375f3 | 2007-02-25 04:36:01 -0800 | [diff] [blame] | 933 | dr->enabled = 0; |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 934 | |
Inaky Perez-Gonzalez | bae94d0 | 2006-11-22 12:40:31 -0800 | [diff] [blame] | 935 | if (atomic_sub_return(1, &dev->enable_cnt) != 0) |
| 936 | return; |
| 937 | |
Shaohua Li | 4348a2d | 2007-10-24 10:45:08 +0800 | [diff] [blame] | 938 | /* Wait for all transactions are finished before disabling the device */ |
| 939 | pcie_wait_pending_transaction(dev); |
| 940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | pci_read_config_word(dev, PCI_COMMAND, &pci_command); |
| 942 | if (pci_command & PCI_COMMAND_MASTER) { |
| 943 | pci_command &= ~PCI_COMMAND_MASTER; |
| 944 | pci_write_config_word(dev, PCI_COMMAND, pci_command); |
| 945 | } |
Kenji Kaneshige | ceb4374 | 2005-04-08 14:53:31 +0900 | [diff] [blame] | 946 | dev->is_busmaster = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | |
| 948 | pcibios_disable_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | } |
| 950 | |
| 951 | /** |
Brian King | f7bdd12 | 2007-04-06 16:39:36 -0500 | [diff] [blame] | 952 | * pcibios_set_pcie_reset_state - set reset state for device dev |
| 953 | * @dev: the PCI-E device reset |
| 954 | * @state: Reset state to enter into |
| 955 | * |
| 956 | * |
| 957 | * Sets the PCI-E reset state for the device. This is the default |
| 958 | * implementation. Architecture implementations can override this. |
| 959 | */ |
| 960 | int __attribute__ ((weak)) pcibios_set_pcie_reset_state(struct pci_dev *dev, |
| 961 | enum pcie_reset_state state) |
| 962 | { |
| 963 | return -EINVAL; |
| 964 | } |
| 965 | |
| 966 | /** |
| 967 | * pci_set_pcie_reset_state - set reset state for device dev |
| 968 | * @dev: the PCI-E device reset |
| 969 | * @state: Reset state to enter into |
| 970 | * |
| 971 | * |
| 972 | * Sets the PCI reset state for the device. |
| 973 | */ |
| 974 | int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) |
| 975 | { |
| 976 | return pcibios_set_pcie_reset_state(dev, state); |
| 977 | } |
| 978 | |
| 979 | /** |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 980 | * pci_enable_wake - enable PCI device as wakeup event source |
| 981 | * @dev: PCI device affected |
| 982 | * @state: PCI state from which device will issue wakeup events |
| 983 | * @enable: True to enable event generation; false to disable |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | * |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 985 | * This enables the device as a wakeup event source, or disables it. |
| 986 | * When such events involves platform-specific hooks, those hooks are |
| 987 | * called automatically by this routine. |
| 988 | * |
| 989 | * Devices with legacy power management (no standard PCI PM capabilities) |
| 990 | * always require such platform hooks. Depending on the platform, devices |
| 991 | * supporting the standard PCI PME# signal may require such platform hooks; |
| 992 | * they always update bits in config space to allow PME# generation. |
| 993 | * |
| 994 | * -EIO is returned if the device can't ever be a wakeup event source. |
| 995 | * -EINVAL is returned if the device can't generate wakeup events from |
| 996 | * the specified PCI state. Returns zero if the operation is successful. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | */ |
| 998 | int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable) |
| 999 | { |
| 1000 | int pm; |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 1001 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | u16 value; |
| 1003 | |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 1004 | /* Note that drivers should verify device_may_wakeup(&dev->dev) |
| 1005 | * before calling this function. Platform code should report |
| 1006 | * errors when drivers try to enable wakeup on devices that |
| 1007 | * can't issue wakeups, or on which wakeups were disabled by |
| 1008 | * userspace updating the /sys/devices.../power/wakeup file. |
| 1009 | */ |
| 1010 | |
| 1011 | status = call_platform_enable_wakeup(&dev->dev, enable); |
| 1012 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | /* find PCI PM capability in list */ |
| 1014 | pm = pci_find_capability(dev, PCI_CAP_ID_PM); |
| 1015 | |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 1016 | /* If device doesn't support PM Capabilities, but caller wants to |
| 1017 | * disable wake events, it's a NOP. Otherwise fail unless the |
| 1018 | * platform hooks handled this legacy device already. |
| 1019 | */ |
| 1020 | if (!pm) |
| 1021 | return enable ? status : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
| 1023 | /* Check device's ability to generate PME# */ |
| 1024 | pci_read_config_word(dev,pm+PCI_PM_PMC,&value); |
| 1025 | |
| 1026 | value &= PCI_PM_CAP_PME_MASK; |
| 1027 | value >>= ffs(PCI_PM_CAP_PME_MASK) - 1; /* First bit of mask */ |
| 1028 | |
| 1029 | /* Check if it can generate PME# from requested state. */ |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 1030 | if (!value || !(value & (1 << state))) { |
| 1031 | /* if it can't, revert what the platform hook changed, |
| 1032 | * always reporting the base "EINVAL, can't PME#" error |
| 1033 | */ |
| 1034 | if (enable) |
| 1035 | call_platform_enable_wakeup(&dev->dev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | return enable ? -EINVAL : 0; |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 1037 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | pci_read_config_word(dev, pm + PCI_PM_CTRL, &value); |
| 1040 | |
| 1041 | /* Clear PME_Status by writing 1 to it and enable PME# */ |
| 1042 | value |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE; |
| 1043 | |
| 1044 | if (!enable) |
| 1045 | value &= ~PCI_PM_CTRL_PME_ENABLE; |
| 1046 | |
| 1047 | pci_write_config_word(dev, pm + PCI_PM_CTRL, value); |
David Brownell | 075c177 | 2007-04-26 00:12:06 -0700 | [diff] [blame] | 1048 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | return 0; |
| 1050 | } |
| 1051 | |
| 1052 | int |
| 1053 | pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) |
| 1054 | { |
| 1055 | u8 pin; |
| 1056 | |
Kristen Accardi | 514d207 | 2005-11-02 16:24:39 -0800 | [diff] [blame] | 1057 | pin = dev->pin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | if (!pin) |
| 1059 | return -1; |
| 1060 | pin--; |
| 1061 | while (dev->bus->self) { |
| 1062 | pin = (pin + PCI_SLOT(dev->devfn)) % 4; |
| 1063 | dev = dev->bus->self; |
| 1064 | } |
| 1065 | *bridge = dev; |
| 1066 | return pin; |
| 1067 | } |
| 1068 | |
| 1069 | /** |
| 1070 | * pci_release_region - Release a PCI bar |
| 1071 | * @pdev: PCI device whose resources were previously reserved by pci_request_region |
| 1072 | * @bar: BAR to release |
| 1073 | * |
| 1074 | * Releases the PCI I/O and memory resources previously reserved by a |
| 1075 | * successful call to pci_request_region. Call this function only |
| 1076 | * after all use of the PCI regions has ceased. |
| 1077 | */ |
| 1078 | void pci_release_region(struct pci_dev *pdev, int bar) |
| 1079 | { |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 1080 | struct pci_devres *dr; |
| 1081 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | if (pci_resource_len(pdev, bar) == 0) |
| 1083 | return; |
| 1084 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) |
| 1085 | release_region(pci_resource_start(pdev, bar), |
| 1086 | pci_resource_len(pdev, bar)); |
| 1087 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) |
| 1088 | release_mem_region(pci_resource_start(pdev, bar), |
| 1089 | pci_resource_len(pdev, bar)); |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 1090 | |
| 1091 | dr = find_pci_dr(pdev); |
| 1092 | if (dr) |
| 1093 | dr->region_mask &= ~(1 << bar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | } |
| 1095 | |
| 1096 | /** |
| 1097 | * pci_request_region - Reserved PCI I/O and memory resource |
| 1098 | * @pdev: PCI device whose resources are to be reserved |
| 1099 | * @bar: BAR to be reserved |
| 1100 | * @res_name: Name to be associated with resource. |
| 1101 | * |
| 1102 | * Mark the PCI region associated with PCI device @pdev BR @bar as |
| 1103 | * being reserved by owner @res_name. Do not access any |
| 1104 | * address inside the PCI regions unless this call returns |
| 1105 | * successfully. |
| 1106 | * |
| 1107 | * Returns 0 on success, or %EBUSY on error. A warning |
| 1108 | * message is also printed on failure. |
| 1109 | */ |
Jeff Garzik | 3c990e9 | 2006-03-04 21:52:42 -0500 | [diff] [blame] | 1110 | int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | { |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 1112 | struct pci_devres *dr; |
| 1113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | if (pci_resource_len(pdev, bar) == 0) |
| 1115 | return 0; |
| 1116 | |
| 1117 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) { |
| 1118 | if (!request_region(pci_resource_start(pdev, bar), |
| 1119 | pci_resource_len(pdev, bar), res_name)) |
| 1120 | goto err_out; |
| 1121 | } |
| 1122 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) { |
| 1123 | if (!request_mem_region(pci_resource_start(pdev, bar), |
| 1124 | pci_resource_len(pdev, bar), res_name)) |
| 1125 | goto err_out; |
| 1126 | } |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 1127 | |
| 1128 | dr = find_pci_dr(pdev); |
| 1129 | if (dr) |
| 1130 | dr->region_mask |= 1 << bar; |
| 1131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | return 0; |
| 1133 | |
| 1134 | err_out: |
Greg Kroah-Hartman | 1396a8c | 2006-06-12 15:14:29 -0700 | [diff] [blame] | 1135 | printk (KERN_WARNING "PCI: Unable to reserve %s region #%d:%llx@%llx " |
| 1136 | "for device %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | pci_resource_flags(pdev, bar) & IORESOURCE_IO ? "I/O" : "mem", |
| 1138 | bar + 1, /* PCI BAR # */ |
Greg Kroah-Hartman | 1396a8c | 2006-06-12 15:14:29 -0700 | [diff] [blame] | 1139 | (unsigned long long)pci_resource_len(pdev, bar), |
| 1140 | (unsigned long long)pci_resource_start(pdev, bar), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | pci_name(pdev)); |
| 1142 | return -EBUSY; |
| 1143 | } |
| 1144 | |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1145 | /** |
| 1146 | * pci_release_selected_regions - Release selected PCI I/O and memory resources |
| 1147 | * @pdev: PCI device whose resources were previously reserved |
| 1148 | * @bars: Bitmask of BARs to be released |
| 1149 | * |
| 1150 | * Release selected PCI I/O and memory resources previously reserved. |
| 1151 | * Call this function only after all use of the PCI regions has ceased. |
| 1152 | */ |
| 1153 | void pci_release_selected_regions(struct pci_dev *pdev, int bars) |
| 1154 | { |
| 1155 | int i; |
| 1156 | |
| 1157 | for (i = 0; i < 6; i++) |
| 1158 | if (bars & (1 << i)) |
| 1159 | pci_release_region(pdev, i); |
| 1160 | } |
| 1161 | |
| 1162 | /** |
| 1163 | * pci_request_selected_regions - Reserve selected PCI I/O and memory resources |
| 1164 | * @pdev: PCI device whose resources are to be reserved |
| 1165 | * @bars: Bitmask of BARs to be requested |
| 1166 | * @res_name: Name to be associated with resource |
| 1167 | */ |
| 1168 | int pci_request_selected_regions(struct pci_dev *pdev, int bars, |
| 1169 | const char *res_name) |
| 1170 | { |
| 1171 | int i; |
| 1172 | |
| 1173 | for (i = 0; i < 6; i++) |
| 1174 | if (bars & (1 << i)) |
| 1175 | if(pci_request_region(pdev, i, res_name)) |
| 1176 | goto err_out; |
| 1177 | return 0; |
| 1178 | |
| 1179 | err_out: |
| 1180 | while(--i >= 0) |
| 1181 | if (bars & (1 << i)) |
| 1182 | pci_release_region(pdev, i); |
| 1183 | |
| 1184 | return -EBUSY; |
| 1185 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | |
| 1187 | /** |
| 1188 | * pci_release_regions - Release reserved PCI I/O and memory resources |
| 1189 | * @pdev: PCI device whose resources were previously reserved by pci_request_regions |
| 1190 | * |
| 1191 | * Releases all PCI I/O and memory resources previously reserved by a |
| 1192 | * successful call to pci_request_regions. Call this function only |
| 1193 | * after all use of the PCI regions has ceased. |
| 1194 | */ |
| 1195 | |
| 1196 | void pci_release_regions(struct pci_dev *pdev) |
| 1197 | { |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1198 | pci_release_selected_regions(pdev, (1 << 6) - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | } |
| 1200 | |
| 1201 | /** |
| 1202 | * pci_request_regions - Reserved PCI I/O and memory resources |
| 1203 | * @pdev: PCI device whose resources are to be reserved |
| 1204 | * @res_name: Name to be associated with resource. |
| 1205 | * |
| 1206 | * Mark all PCI regions associated with PCI device @pdev as |
| 1207 | * being reserved by owner @res_name. Do not access any |
| 1208 | * address inside the PCI regions unless this call returns |
| 1209 | * successfully. |
| 1210 | * |
| 1211 | * Returns 0 on success, or %EBUSY on error. A warning |
| 1212 | * message is also printed on failure. |
| 1213 | */ |
Jeff Garzik | 3c990e9 | 2006-03-04 21:52:42 -0500 | [diff] [blame] | 1214 | int pci_request_regions(struct pci_dev *pdev, const char *res_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | { |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1216 | return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | } |
| 1218 | |
| 1219 | /** |
| 1220 | * pci_set_master - enables bus-mastering for device dev |
| 1221 | * @dev: the PCI device to enable |
| 1222 | * |
| 1223 | * Enables bus-mastering on the device and calls pcibios_set_master() |
| 1224 | * to do the needed arch specific settings. |
| 1225 | */ |
| 1226 | void |
| 1227 | pci_set_master(struct pci_dev *dev) |
| 1228 | { |
| 1229 | u16 cmd; |
| 1230 | |
| 1231 | pci_read_config_word(dev, PCI_COMMAND, &cmd); |
| 1232 | if (! (cmd & PCI_COMMAND_MASTER)) { |
| 1233 | pr_debug("PCI: Enabling bus mastering for device %s\n", pci_name(dev)); |
| 1234 | cmd |= PCI_COMMAND_MASTER; |
| 1235 | pci_write_config_word(dev, PCI_COMMAND, cmd); |
| 1236 | } |
| 1237 | dev->is_busmaster = 1; |
| 1238 | pcibios_set_master(dev); |
| 1239 | } |
| 1240 | |
Matthew Wilcox | edb2d97 | 2006-10-10 08:01:21 -0600 | [diff] [blame] | 1241 | #ifdef PCI_DISABLE_MWI |
| 1242 | int pci_set_mwi(struct pci_dev *dev) |
| 1243 | { |
| 1244 | return 0; |
| 1245 | } |
| 1246 | |
Randy Dunlap | 694625c | 2007-07-09 11:55:54 -0700 | [diff] [blame] | 1247 | int pci_try_set_mwi(struct pci_dev *dev) |
| 1248 | { |
| 1249 | return 0; |
| 1250 | } |
| 1251 | |
Matthew Wilcox | edb2d97 | 2006-10-10 08:01:21 -0600 | [diff] [blame] | 1252 | void pci_clear_mwi(struct pci_dev *dev) |
| 1253 | { |
| 1254 | } |
| 1255 | |
| 1256 | #else |
Matthew Wilcox | ebf5a24 | 2006-10-10 08:01:20 -0600 | [diff] [blame] | 1257 | |
| 1258 | #ifndef PCI_CACHE_LINE_BYTES |
| 1259 | #define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES |
| 1260 | #endif |
| 1261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | /* This can be overridden by arch code. */ |
Matthew Wilcox | ebf5a24 | 2006-10-10 08:01:20 -0600 | [diff] [blame] | 1263 | /* Don't forget this is measured in 32-bit words, not bytes */ |
| 1264 | u8 pci_cache_line_size = PCI_CACHE_LINE_BYTES / 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
| 1266 | /** |
Matthew Wilcox | edb2d97 | 2006-10-10 08:01:21 -0600 | [diff] [blame] | 1267 | * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed |
| 1268 | * @dev: the PCI device for which MWI is to be enabled |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | * |
Matthew Wilcox | edb2d97 | 2006-10-10 08:01:21 -0600 | [diff] [blame] | 1270 | * Helper function for pci_set_mwi. |
| 1271 | * Originally copied from drivers/net/acenic.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>. |
| 1273 | * |
| 1274 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. |
| 1275 | */ |
| 1276 | static int |
Matthew Wilcox | edb2d97 | 2006-10-10 08:01:21 -0600 | [diff] [blame] | 1277 | pci_set_cacheline_size(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | { |
| 1279 | u8 cacheline_size; |
| 1280 | |
| 1281 | if (!pci_cache_line_size) |
| 1282 | return -EINVAL; /* The system doesn't support MWI. */ |
| 1283 | |
| 1284 | /* Validate current setting: the PCI_CACHE_LINE_SIZE must be |
| 1285 | equal to or multiple of the right value. */ |
| 1286 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); |
| 1287 | if (cacheline_size >= pci_cache_line_size && |
| 1288 | (cacheline_size % pci_cache_line_size) == 0) |
| 1289 | return 0; |
| 1290 | |
| 1291 | /* Write the correct value. */ |
| 1292 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size); |
| 1293 | /* Read it back. */ |
| 1294 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); |
| 1295 | if (cacheline_size == pci_cache_line_size) |
| 1296 | return 0; |
| 1297 | |
| 1298 | printk(KERN_DEBUG "PCI: cache line size of %d is not supported " |
| 1299 | "by device %s\n", pci_cache_line_size << 2, pci_name(dev)); |
| 1300 | |
| 1301 | return -EINVAL; |
| 1302 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | |
| 1304 | /** |
| 1305 | * pci_set_mwi - enables memory-write-invalidate PCI transaction |
| 1306 | * @dev: the PCI device for which MWI is enabled |
| 1307 | * |
Randy Dunlap | 694625c | 2007-07-09 11:55:54 -0700 | [diff] [blame] | 1308 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | * |
| 1310 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. |
| 1311 | */ |
| 1312 | int |
| 1313 | pci_set_mwi(struct pci_dev *dev) |
| 1314 | { |
| 1315 | int rc; |
| 1316 | u16 cmd; |
| 1317 | |
Matthew Wilcox | edb2d97 | 2006-10-10 08:01:21 -0600 | [diff] [blame] | 1318 | rc = pci_set_cacheline_size(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | if (rc) |
| 1320 | return rc; |
| 1321 | |
| 1322 | pci_read_config_word(dev, PCI_COMMAND, &cmd); |
| 1323 | if (! (cmd & PCI_COMMAND_INVALIDATE)) { |
Randy Dunlap | 694625c | 2007-07-09 11:55:54 -0700 | [diff] [blame] | 1324 | pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n", |
| 1325 | pci_name(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | cmd |= PCI_COMMAND_INVALIDATE; |
| 1327 | pci_write_config_word(dev, PCI_COMMAND, cmd); |
| 1328 | } |
| 1329 | |
| 1330 | return 0; |
| 1331 | } |
| 1332 | |
| 1333 | /** |
Randy Dunlap | 694625c | 2007-07-09 11:55:54 -0700 | [diff] [blame] | 1334 | * pci_try_set_mwi - enables memory-write-invalidate PCI transaction |
| 1335 | * @dev: the PCI device for which MWI is enabled |
| 1336 | * |
| 1337 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. |
| 1338 | * Callers are not required to check the return value. |
| 1339 | * |
| 1340 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. |
| 1341 | */ |
| 1342 | int pci_try_set_mwi(struct pci_dev *dev) |
| 1343 | { |
| 1344 | int rc = pci_set_mwi(dev); |
| 1345 | return rc; |
| 1346 | } |
| 1347 | |
| 1348 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | * pci_clear_mwi - disables Memory-Write-Invalidate for device dev |
| 1350 | * @dev: the PCI device to disable |
| 1351 | * |
| 1352 | * Disables PCI Memory-Write-Invalidate transaction on the device |
| 1353 | */ |
| 1354 | void |
| 1355 | pci_clear_mwi(struct pci_dev *dev) |
| 1356 | { |
| 1357 | u16 cmd; |
| 1358 | |
| 1359 | pci_read_config_word(dev, PCI_COMMAND, &cmd); |
| 1360 | if (cmd & PCI_COMMAND_INVALIDATE) { |
| 1361 | cmd &= ~PCI_COMMAND_INVALIDATE; |
| 1362 | pci_write_config_word(dev, PCI_COMMAND, cmd); |
| 1363 | } |
| 1364 | } |
Matthew Wilcox | edb2d97 | 2006-10-10 08:01:21 -0600 | [diff] [blame] | 1365 | #endif /* ! PCI_DISABLE_MWI */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | |
Brett M Russ | a04ce0f | 2005-08-15 15:23:41 -0400 | [diff] [blame] | 1367 | /** |
| 1368 | * pci_intx - enables/disables PCI INTx for device dev |
Randy Dunlap | 8f7020d | 2005-10-23 11:57:38 -0700 | [diff] [blame] | 1369 | * @pdev: the PCI device to operate on |
| 1370 | * @enable: boolean: whether to enable or disable PCI INTx |
Brett M Russ | a04ce0f | 2005-08-15 15:23:41 -0400 | [diff] [blame] | 1371 | * |
| 1372 | * Enables/disables PCI INTx for device dev |
| 1373 | */ |
| 1374 | void |
| 1375 | pci_intx(struct pci_dev *pdev, int enable) |
| 1376 | { |
| 1377 | u16 pci_command, new; |
| 1378 | |
| 1379 | pci_read_config_word(pdev, PCI_COMMAND, &pci_command); |
| 1380 | |
| 1381 | if (enable) { |
| 1382 | new = pci_command & ~PCI_COMMAND_INTX_DISABLE; |
| 1383 | } else { |
| 1384 | new = pci_command | PCI_COMMAND_INTX_DISABLE; |
| 1385 | } |
| 1386 | |
| 1387 | if (new != pci_command) { |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 1388 | struct pci_devres *dr; |
| 1389 | |
Brett M Russ | 2fd9d74 | 2005-09-09 10:02:22 -0700 | [diff] [blame] | 1390 | pci_write_config_word(pdev, PCI_COMMAND, new); |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 1391 | |
| 1392 | dr = find_pci_dr(pdev); |
| 1393 | if (dr && !dr->restore_intx) { |
| 1394 | dr->restore_intx = 1; |
| 1395 | dr->orig_intx = !enable; |
| 1396 | } |
Brett M Russ | a04ce0f | 2005-08-15 15:23:41 -0400 | [diff] [blame] | 1397 | } |
| 1398 | } |
| 1399 | |
Eric W. Biederman | f5f2b13 | 2007-03-05 00:30:07 -0800 | [diff] [blame] | 1400 | /** |
| 1401 | * pci_msi_off - disables any msi or msix capabilities |
Randy Dunlap | 8d7d86e | 2007-03-16 19:55:52 -0700 | [diff] [blame] | 1402 | * @dev: the PCI device to operate on |
Eric W. Biederman | f5f2b13 | 2007-03-05 00:30:07 -0800 | [diff] [blame] | 1403 | * |
| 1404 | * If you want to use msi see pci_enable_msi and friends. |
| 1405 | * This is a lower level primitive that allows us to disable |
| 1406 | * msi operation at the device level. |
| 1407 | */ |
| 1408 | void pci_msi_off(struct pci_dev *dev) |
| 1409 | { |
| 1410 | int pos; |
| 1411 | u16 control; |
| 1412 | |
| 1413 | pos = pci_find_capability(dev, PCI_CAP_ID_MSI); |
| 1414 | if (pos) { |
| 1415 | pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control); |
| 1416 | control &= ~PCI_MSI_FLAGS_ENABLE; |
| 1417 | pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control); |
| 1418 | } |
| 1419 | pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); |
| 1420 | if (pos) { |
| 1421 | pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); |
| 1422 | control &= ~PCI_MSIX_FLAGS_ENABLE; |
| 1423 | pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); |
| 1424 | } |
| 1425 | } |
| 1426 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | #ifndef HAVE_ARCH_PCI_SET_DMA_MASK |
| 1428 | /* |
| 1429 | * These can be overridden by arch-specific implementations |
| 1430 | */ |
| 1431 | int |
| 1432 | pci_set_dma_mask(struct pci_dev *dev, u64 mask) |
| 1433 | { |
| 1434 | if (!pci_dma_supported(dev, mask)) |
| 1435 | return -EIO; |
| 1436 | |
| 1437 | dev->dma_mask = mask; |
| 1438 | |
| 1439 | return 0; |
| 1440 | } |
| 1441 | |
| 1442 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask) |
| 1444 | { |
| 1445 | if (!pci_dma_supported(dev, mask)) |
| 1446 | return -EIO; |
| 1447 | |
| 1448 | dev->dev.coherent_dma_mask = mask; |
| 1449 | |
| 1450 | return 0; |
| 1451 | } |
| 1452 | #endif |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1453 | |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 1454 | #ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE |
| 1455 | int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size) |
| 1456 | { |
| 1457 | return dma_set_max_seg_size(&dev->dev, size); |
| 1458 | } |
| 1459 | EXPORT_SYMBOL(pci_set_dma_max_seg_size); |
| 1460 | #endif |
| 1461 | |
FUJITA Tomonori | 59fc67d | 2008-02-04 22:28:14 -0800 | [diff] [blame] | 1462 | #ifndef HAVE_ARCH_PCI_SET_DMA_SEGMENT_BOUNDARY |
| 1463 | int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask) |
| 1464 | { |
| 1465 | return dma_set_seg_boundary(&dev->dev, mask); |
| 1466 | } |
| 1467 | EXPORT_SYMBOL(pci_set_dma_seg_boundary); |
| 1468 | #endif |
| 1469 | |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1470 | /** |
Peter Oruba | d556ad4 | 2007-05-15 13:59:13 +0200 | [diff] [blame] | 1471 | * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count |
| 1472 | * @dev: PCI device to query |
| 1473 | * |
| 1474 | * Returns mmrbc: maximum designed memory read count in bytes |
| 1475 | * or appropriate error value. |
| 1476 | */ |
| 1477 | int pcix_get_max_mmrbc(struct pci_dev *dev) |
| 1478 | { |
Andrew Morton | b7b095c | 2007-07-09 11:55:50 -0700 | [diff] [blame] | 1479 | int err, cap; |
Peter Oruba | d556ad4 | 2007-05-15 13:59:13 +0200 | [diff] [blame] | 1480 | u32 stat; |
| 1481 | |
| 1482 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| 1483 | if (!cap) |
| 1484 | return -EINVAL; |
| 1485 | |
| 1486 | err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat); |
| 1487 | if (err) |
| 1488 | return -EINVAL; |
| 1489 | |
Andrew Morton | b7b095c | 2007-07-09 11:55:50 -0700 | [diff] [blame] | 1490 | return (stat & PCI_X_STATUS_MAX_READ) >> 12; |
Peter Oruba | d556ad4 | 2007-05-15 13:59:13 +0200 | [diff] [blame] | 1491 | } |
| 1492 | EXPORT_SYMBOL(pcix_get_max_mmrbc); |
| 1493 | |
| 1494 | /** |
| 1495 | * pcix_get_mmrbc - get PCI-X maximum memory read byte count |
| 1496 | * @dev: PCI device to query |
| 1497 | * |
| 1498 | * Returns mmrbc: maximum memory read count in bytes |
| 1499 | * or appropriate error value. |
| 1500 | */ |
| 1501 | int pcix_get_mmrbc(struct pci_dev *dev) |
| 1502 | { |
| 1503 | int ret, cap; |
| 1504 | u32 cmd; |
| 1505 | |
| 1506 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| 1507 | if (!cap) |
| 1508 | return -EINVAL; |
| 1509 | |
| 1510 | ret = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd); |
| 1511 | if (!ret) |
| 1512 | ret = 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2); |
| 1513 | |
| 1514 | return ret; |
| 1515 | } |
| 1516 | EXPORT_SYMBOL(pcix_get_mmrbc); |
| 1517 | |
| 1518 | /** |
| 1519 | * pcix_set_mmrbc - set PCI-X maximum memory read byte count |
| 1520 | * @dev: PCI device to query |
| 1521 | * @mmrbc: maximum memory read count in bytes |
| 1522 | * valid values are 512, 1024, 2048, 4096 |
| 1523 | * |
| 1524 | * If possible sets maximum memory read byte count, some bridges have erratas |
| 1525 | * that prevent this. |
| 1526 | */ |
| 1527 | int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc) |
| 1528 | { |
| 1529 | int cap, err = -EINVAL; |
| 1530 | u32 stat, cmd, v, o; |
| 1531 | |
vignesh babu | 229f5af | 2007-08-13 18:23:14 +0530 | [diff] [blame] | 1532 | if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc)) |
Peter Oruba | d556ad4 | 2007-05-15 13:59:13 +0200 | [diff] [blame] | 1533 | goto out; |
| 1534 | |
| 1535 | v = ffs(mmrbc) - 10; |
| 1536 | |
| 1537 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| 1538 | if (!cap) |
| 1539 | goto out; |
| 1540 | |
| 1541 | err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat); |
| 1542 | if (err) |
| 1543 | goto out; |
| 1544 | |
| 1545 | if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21) |
| 1546 | return -E2BIG; |
| 1547 | |
| 1548 | err = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd); |
| 1549 | if (err) |
| 1550 | goto out; |
| 1551 | |
| 1552 | o = (cmd & PCI_X_CMD_MAX_READ) >> 2; |
| 1553 | if (o != v) { |
| 1554 | if (v > o && dev->bus && |
| 1555 | (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC)) |
| 1556 | return -EIO; |
| 1557 | |
| 1558 | cmd &= ~PCI_X_CMD_MAX_READ; |
| 1559 | cmd |= v << 2; |
| 1560 | err = pci_write_config_dword(dev, cap + PCI_X_CMD, cmd); |
| 1561 | } |
| 1562 | out: |
| 1563 | return err; |
| 1564 | } |
| 1565 | EXPORT_SYMBOL(pcix_set_mmrbc); |
| 1566 | |
| 1567 | /** |
| 1568 | * pcie_get_readrq - get PCI Express read request size |
| 1569 | * @dev: PCI device to query |
| 1570 | * |
| 1571 | * Returns maximum memory read request in bytes |
| 1572 | * or appropriate error value. |
| 1573 | */ |
| 1574 | int pcie_get_readrq(struct pci_dev *dev) |
| 1575 | { |
| 1576 | int ret, cap; |
| 1577 | u16 ctl; |
| 1578 | |
| 1579 | cap = pci_find_capability(dev, PCI_CAP_ID_EXP); |
| 1580 | if (!cap) |
| 1581 | return -EINVAL; |
| 1582 | |
| 1583 | ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); |
| 1584 | if (!ret) |
| 1585 | ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12); |
| 1586 | |
| 1587 | return ret; |
| 1588 | } |
| 1589 | EXPORT_SYMBOL(pcie_get_readrq); |
| 1590 | |
| 1591 | /** |
| 1592 | * pcie_set_readrq - set PCI Express maximum memory read request |
| 1593 | * @dev: PCI device to query |
Randy Dunlap | 42e61f4 | 2007-07-23 21:42:11 -0700 | [diff] [blame] | 1594 | * @rq: maximum memory read count in bytes |
Peter Oruba | d556ad4 | 2007-05-15 13:59:13 +0200 | [diff] [blame] | 1595 | * valid values are 128, 256, 512, 1024, 2048, 4096 |
| 1596 | * |
| 1597 | * If possible sets maximum read byte count |
| 1598 | */ |
| 1599 | int pcie_set_readrq(struct pci_dev *dev, int rq) |
| 1600 | { |
| 1601 | int cap, err = -EINVAL; |
| 1602 | u16 ctl, v; |
| 1603 | |
vignesh babu | 229f5af | 2007-08-13 18:23:14 +0530 | [diff] [blame] | 1604 | if (rq < 128 || rq > 4096 || !is_power_of_2(rq)) |
Peter Oruba | d556ad4 | 2007-05-15 13:59:13 +0200 | [diff] [blame] | 1605 | goto out; |
| 1606 | |
| 1607 | v = (ffs(rq) - 8) << 12; |
| 1608 | |
| 1609 | cap = pci_find_capability(dev, PCI_CAP_ID_EXP); |
| 1610 | if (!cap) |
| 1611 | goto out; |
| 1612 | |
| 1613 | err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); |
| 1614 | if (err) |
| 1615 | goto out; |
| 1616 | |
| 1617 | if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) { |
| 1618 | ctl &= ~PCI_EXP_DEVCTL_READRQ; |
| 1619 | ctl |= v; |
| 1620 | err = pci_write_config_dword(dev, cap + PCI_EXP_DEVCTL, ctl); |
| 1621 | } |
| 1622 | |
| 1623 | out: |
| 1624 | return err; |
| 1625 | } |
| 1626 | EXPORT_SYMBOL(pcie_set_readrq); |
| 1627 | |
| 1628 | /** |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1629 | * pci_select_bars - Make BAR mask from the type of resource |
Randy Dunlap | f95d882 | 2007-02-10 14:41:56 -0800 | [diff] [blame] | 1630 | * @dev: the PCI device for which BAR mask is made |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1631 | * @flags: resource type mask to be selected |
| 1632 | * |
| 1633 | * This helper routine makes bar mask from the type of resource. |
| 1634 | */ |
| 1635 | int pci_select_bars(struct pci_dev *dev, unsigned long flags) |
| 1636 | { |
| 1637 | int i, bars = 0; |
| 1638 | for (i = 0; i < PCI_NUM_RESOURCES; i++) |
| 1639 | if (pci_resource_flags(dev, i) & flags) |
| 1640 | bars |= (1 << i); |
| 1641 | return bars; |
| 1642 | } |
| 1643 | |
Jeff Garzik | 32a2eea | 2007-10-11 16:57:27 -0400 | [diff] [blame] | 1644 | static void __devinit pci_no_domains(void) |
| 1645 | { |
| 1646 | #ifdef CONFIG_PCI_DOMAINS |
| 1647 | pci_domains_supported = 0; |
| 1648 | #endif |
| 1649 | } |
| 1650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | static int __devinit pci_init(void) |
| 1652 | { |
| 1653 | struct pci_dev *dev = NULL; |
| 1654 | |
| 1655 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
| 1656 | pci_fixup_device(pci_fixup_final, dev); |
| 1657 | } |
| 1658 | return 0; |
| 1659 | } |
| 1660 | |
| 1661 | static int __devinit pci_setup(char *str) |
| 1662 | { |
| 1663 | while (str) { |
| 1664 | char *k = strchr(str, ','); |
| 1665 | if (k) |
| 1666 | *k++ = 0; |
| 1667 | if (*str && (str = pcibios_setup(str)) && *str) { |
Matthew Wilcox | 309e57d | 2006-03-05 22:33:34 -0700 | [diff] [blame] | 1668 | if (!strcmp(str, "nomsi")) { |
| 1669 | pci_no_msi(); |
Randy Dunlap | 7f78576 | 2007-10-05 13:17:58 -0700 | [diff] [blame] | 1670 | } else if (!strcmp(str, "noaer")) { |
| 1671 | pci_no_aer(); |
Jeff Garzik | 32a2eea | 2007-10-11 16:57:27 -0400 | [diff] [blame] | 1672 | } else if (!strcmp(str, "nodomains")) { |
| 1673 | pci_no_domains(); |
Atsushi Nemoto | 4516a61 | 2007-02-05 16:36:06 -0800 | [diff] [blame] | 1674 | } else if (!strncmp(str, "cbiosize=", 9)) { |
| 1675 | pci_cardbus_io_size = memparse(str + 9, &str); |
| 1676 | } else if (!strncmp(str, "cbmemsize=", 10)) { |
| 1677 | pci_cardbus_mem_size = memparse(str + 10, &str); |
Matthew Wilcox | 309e57d | 2006-03-05 22:33:34 -0700 | [diff] [blame] | 1678 | } else { |
| 1679 | printk(KERN_ERR "PCI: Unknown option `%s'\n", |
| 1680 | str); |
| 1681 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | } |
| 1683 | str = k; |
| 1684 | } |
Andi Kleen | 0637a70 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 1685 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | } |
Andi Kleen | 0637a70 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 1687 | early_param("pci", pci_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | |
| 1689 | device_initcall(pci_init); |
| 1690 | |
Tejun Heo | 0b62e13 | 2007-07-27 14:43:35 +0900 | [diff] [blame] | 1691 | EXPORT_SYMBOL(pci_reenable_device); |
Benjamin Herrenschmidt | b718989 | 2007-12-20 15:28:08 +1100 | [diff] [blame] | 1692 | EXPORT_SYMBOL(pci_enable_device_io); |
| 1693 | EXPORT_SYMBOL(pci_enable_device_mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | EXPORT_SYMBOL(pci_enable_device); |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 1695 | EXPORT_SYMBOL(pcim_enable_device); |
| 1696 | EXPORT_SYMBOL(pcim_pin_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | EXPORT_SYMBOL(pci_disable_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | EXPORT_SYMBOL(pci_find_capability); |
| 1699 | EXPORT_SYMBOL(pci_bus_find_capability); |
| 1700 | EXPORT_SYMBOL(pci_release_regions); |
| 1701 | EXPORT_SYMBOL(pci_request_regions); |
| 1702 | EXPORT_SYMBOL(pci_release_region); |
| 1703 | EXPORT_SYMBOL(pci_request_region); |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1704 | EXPORT_SYMBOL(pci_release_selected_regions); |
| 1705 | EXPORT_SYMBOL(pci_request_selected_regions); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | EXPORT_SYMBOL(pci_set_master); |
| 1707 | EXPORT_SYMBOL(pci_set_mwi); |
Randy Dunlap | 694625c | 2007-07-09 11:55:54 -0700 | [diff] [blame] | 1708 | EXPORT_SYMBOL(pci_try_set_mwi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | EXPORT_SYMBOL(pci_clear_mwi); |
Brett M Russ | a04ce0f | 2005-08-15 15:23:41 -0400 | [diff] [blame] | 1710 | EXPORT_SYMBOL_GPL(pci_intx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | EXPORT_SYMBOL(pci_set_dma_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | EXPORT_SYMBOL(pci_set_consistent_dma_mask); |
| 1713 | EXPORT_SYMBOL(pci_assign_resource); |
| 1714 | EXPORT_SYMBOL(pci_find_parent_resource); |
Hidetoshi Seto | c87deff | 2006-12-18 10:31:06 +0900 | [diff] [blame] | 1715 | EXPORT_SYMBOL(pci_select_bars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | |
| 1717 | EXPORT_SYMBOL(pci_set_power_state); |
| 1718 | EXPORT_SYMBOL(pci_save_state); |
| 1719 | EXPORT_SYMBOL(pci_restore_state); |
| 1720 | EXPORT_SYMBOL(pci_enable_wake); |
Brian King | f7bdd12 | 2007-04-06 16:39:36 -0500 | [diff] [blame] | 1721 | EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | |