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1da177e4 | 1 | /* |
1da177e4 LT |
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 -- 2000 Martin Mares <mj@ucw.cz> | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/pci.h> | |
075c1771 | 14 | #include <linux/pm.h> |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/spinlock.h> | |
4e57b681 | 17 | #include <linux/string.h> |
229f5afd | 18 | #include <linux/log2.h> |
7d715a6c | 19 | #include <linux/pci-aspm.h> |
c300bd2f | 20 | #include <linux/pm_wakeup.h> |
8dd7f803 | 21 | #include <linux/interrupt.h> |
1da177e4 | 22 | #include <asm/dma.h> /* isa_dma_bridge_buggy */ |
32a9a682 YS |
23 | #include <linux/device.h> |
24 | #include <asm/setup.h> | |
bc56b9e0 | 25 | #include "pci.h" |
1da177e4 | 26 | |
00240c38 AS |
27 | const char *pci_power_names[] = { |
28 | "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown", | |
29 | }; | |
30 | EXPORT_SYMBOL_GPL(pci_power_names); | |
31 | ||
aa8c6c93 | 32 | unsigned int pci_pm_d3_delay = PCI_PM_D3_WAIT; |
1da177e4 | 33 | |
32a2eea7 JG |
34 | #ifdef CONFIG_PCI_DOMAINS |
35 | int pci_domains_supported = 1; | |
36 | #endif | |
37 | ||
4516a618 AN |
38 | #define DEFAULT_CARDBUS_IO_SIZE (256) |
39 | #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024) | |
40 | /* pci=cbmemsize=nnM,cbiosize=nn can override this */ | |
41 | unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE; | |
42 | unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE; | |
43 | ||
28760489 EB |
44 | #define DEFAULT_HOTPLUG_IO_SIZE (256) |
45 | #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024) | |
46 | /* pci=hpmemsize=nnM,hpiosize=nn can override this */ | |
47 | unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE; | |
48 | unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE; | |
49 | ||
ac1aa47b JB |
50 | /* |
51 | * The default CLS is used if arch didn't set CLS explicitly and not | |
52 | * all pci devices agree on the same value. Arch can override either | |
53 | * the dfl or actual value as it sees fit. Don't forget this is | |
54 | * measured in 32-bit words, not bytes. | |
55 | */ | |
98e724c7 | 56 | u8 pci_dfl_cache_line_size __devinitdata = L1_CACHE_BYTES >> 2; |
ac1aa47b JB |
57 | u8 pci_cache_line_size; |
58 | ||
1da177e4 LT |
59 | /** |
60 | * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children | |
61 | * @bus: pointer to PCI bus structure to search | |
62 | * | |
63 | * Given a PCI bus, returns the highest PCI bus number present in the set | |
64 | * including the given PCI bus and its list of child PCI buses. | |
65 | */ | |
96bde06a | 66 | unsigned char pci_bus_max_busnr(struct pci_bus* bus) |
1da177e4 LT |
67 | { |
68 | struct list_head *tmp; | |
69 | unsigned char max, n; | |
70 | ||
b82db5ce | 71 | max = bus->subordinate; |
1da177e4 LT |
72 | list_for_each(tmp, &bus->children) { |
73 | n = pci_bus_max_busnr(pci_bus_b(tmp)); | |
74 | if(n > max) | |
75 | max = n; | |
76 | } | |
77 | return max; | |
78 | } | |
b82db5ce | 79 | EXPORT_SYMBOL_GPL(pci_bus_max_busnr); |
1da177e4 | 80 | |
1684f5dd AM |
81 | #ifdef CONFIG_HAS_IOMEM |
82 | void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) | |
83 | { | |
84 | /* | |
85 | * Make sure the BAR is actually a memory resource, not an IO resource | |
86 | */ | |
87 | if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) { | |
88 | WARN_ON(1); | |
89 | return NULL; | |
90 | } | |
91 | return ioremap_nocache(pci_resource_start(pdev, bar), | |
92 | pci_resource_len(pdev, bar)); | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(pci_ioremap_bar); | |
95 | #endif | |
96 | ||
b82db5ce | 97 | #if 0 |
1da177e4 LT |
98 | /** |
99 | * pci_max_busnr - returns maximum PCI bus number | |
100 | * | |
101 | * Returns the highest PCI bus number present in the system global list of | |
102 | * PCI buses. | |
103 | */ | |
104 | unsigned char __devinit | |
105 | pci_max_busnr(void) | |
106 | { | |
107 | struct pci_bus *bus = NULL; | |
108 | unsigned char max, n; | |
109 | ||
110 | max = 0; | |
111 | while ((bus = pci_find_next_bus(bus)) != NULL) { | |
112 | n = pci_bus_max_busnr(bus); | |
113 | if(n > max) | |
114 | max = n; | |
115 | } | |
116 | return max; | |
117 | } | |
118 | ||
54c762fe AB |
119 | #endif /* 0 */ |
120 | ||
687d5fe3 ME |
121 | #define PCI_FIND_CAP_TTL 48 |
122 | ||
123 | static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn, | |
124 | u8 pos, int cap, int *ttl) | |
24a4e377 RD |
125 | { |
126 | u8 id; | |
24a4e377 | 127 | |
687d5fe3 | 128 | while ((*ttl)--) { |
24a4e377 RD |
129 | pci_bus_read_config_byte(bus, devfn, pos, &pos); |
130 | if (pos < 0x40) | |
131 | break; | |
132 | pos &= ~3; | |
133 | pci_bus_read_config_byte(bus, devfn, pos + PCI_CAP_LIST_ID, | |
134 | &id); | |
135 | if (id == 0xff) | |
136 | break; | |
137 | if (id == cap) | |
138 | return pos; | |
139 | pos += PCI_CAP_LIST_NEXT; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
687d5fe3 ME |
144 | static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn, |
145 | u8 pos, int cap) | |
146 | { | |
147 | int ttl = PCI_FIND_CAP_TTL; | |
148 | ||
149 | return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl); | |
150 | } | |
151 | ||
24a4e377 RD |
152 | int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap) |
153 | { | |
154 | return __pci_find_next_cap(dev->bus, dev->devfn, | |
155 | pos + PCI_CAP_LIST_NEXT, cap); | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(pci_find_next_capability); | |
158 | ||
d3bac118 ME |
159 | static int __pci_bus_find_cap_start(struct pci_bus *bus, |
160 | unsigned int devfn, u8 hdr_type) | |
1da177e4 LT |
161 | { |
162 | u16 status; | |
1da177e4 LT |
163 | |
164 | pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status); | |
165 | if (!(status & PCI_STATUS_CAP_LIST)) | |
166 | return 0; | |
167 | ||
168 | switch (hdr_type) { | |
169 | case PCI_HEADER_TYPE_NORMAL: | |
170 | case PCI_HEADER_TYPE_BRIDGE: | |
d3bac118 | 171 | return PCI_CAPABILITY_LIST; |
1da177e4 | 172 | case PCI_HEADER_TYPE_CARDBUS: |
d3bac118 | 173 | return PCI_CB_CAPABILITY_LIST; |
1da177e4 LT |
174 | default: |
175 | return 0; | |
176 | } | |
d3bac118 ME |
177 | |
178 | return 0; | |
1da177e4 LT |
179 | } |
180 | ||
181 | /** | |
182 | * pci_find_capability - query for devices' capabilities | |
183 | * @dev: PCI device to query | |
184 | * @cap: capability code | |
185 | * | |
186 | * Tell if a device supports a given PCI capability. | |
187 | * Returns the address of the requested capability structure within the | |
188 | * device's PCI configuration space or 0 in case the device does not | |
189 | * support it. Possible values for @cap: | |
190 | * | |
191 | * %PCI_CAP_ID_PM Power Management | |
192 | * %PCI_CAP_ID_AGP Accelerated Graphics Port | |
193 | * %PCI_CAP_ID_VPD Vital Product Data | |
194 | * %PCI_CAP_ID_SLOTID Slot Identification | |
195 | * %PCI_CAP_ID_MSI Message Signalled Interrupts | |
196 | * %PCI_CAP_ID_CHSWP CompactPCI HotSwap | |
197 | * %PCI_CAP_ID_PCIX PCI-X | |
198 | * %PCI_CAP_ID_EXP PCI Express | |
199 | */ | |
200 | int pci_find_capability(struct pci_dev *dev, int cap) | |
201 | { | |
d3bac118 ME |
202 | int pos; |
203 | ||
204 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); | |
205 | if (pos) | |
206 | pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap); | |
207 | ||
208 | return pos; | |
1da177e4 LT |
209 | } |
210 | ||
211 | /** | |
212 | * pci_bus_find_capability - query for devices' capabilities | |
213 | * @bus: the PCI bus to query | |
214 | * @devfn: PCI device to query | |
215 | * @cap: capability code | |
216 | * | |
217 | * Like pci_find_capability() but works for pci devices that do not have a | |
218 | * pci_dev structure set up yet. | |
219 | * | |
220 | * Returns the address of the requested capability structure within the | |
221 | * device's PCI configuration space or 0 in case the device does not | |
222 | * support it. | |
223 | */ | |
224 | int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap) | |
225 | { | |
d3bac118 | 226 | int pos; |
1da177e4 LT |
227 | u8 hdr_type; |
228 | ||
229 | pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type); | |
230 | ||
d3bac118 ME |
231 | pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f); |
232 | if (pos) | |
233 | pos = __pci_find_next_cap(bus, devfn, pos, cap); | |
234 | ||
235 | return pos; | |
1da177e4 LT |
236 | } |
237 | ||
238 | /** | |
239 | * pci_find_ext_capability - Find an extended capability | |
240 | * @dev: PCI device to query | |
241 | * @cap: capability code | |
242 | * | |
243 | * Returns the address of the requested extended capability structure | |
244 | * within the device's PCI configuration space or 0 if the device does | |
245 | * not support it. Possible values for @cap: | |
246 | * | |
247 | * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting | |
248 | * %PCI_EXT_CAP_ID_VC Virtual Channel | |
249 | * %PCI_EXT_CAP_ID_DSN Device Serial Number | |
250 | * %PCI_EXT_CAP_ID_PWR Power Budgeting | |
251 | */ | |
252 | int pci_find_ext_capability(struct pci_dev *dev, int cap) | |
253 | { | |
254 | u32 header; | |
557848c3 ZY |
255 | int ttl; |
256 | int pos = PCI_CFG_SPACE_SIZE; | |
1da177e4 | 257 | |
557848c3 ZY |
258 | /* minimum 8 bytes per capability */ |
259 | ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; | |
260 | ||
261 | if (dev->cfg_size <= PCI_CFG_SPACE_SIZE) | |
1da177e4 LT |
262 | return 0; |
263 | ||
264 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) | |
265 | return 0; | |
266 | ||
267 | /* | |
268 | * If we have no capabilities, this is indicated by cap ID, | |
269 | * cap version and next pointer all being 0. | |
270 | */ | |
271 | if (header == 0) | |
272 | return 0; | |
273 | ||
274 | while (ttl-- > 0) { | |
275 | if (PCI_EXT_CAP_ID(header) == cap) | |
276 | return pos; | |
277 | ||
278 | pos = PCI_EXT_CAP_NEXT(header); | |
557848c3 | 279 | if (pos < PCI_CFG_SPACE_SIZE) |
1da177e4 LT |
280 | break; |
281 | ||
282 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) | |
283 | break; | |
284 | } | |
285 | ||
286 | return 0; | |
287 | } | |
3a720d72 | 288 | EXPORT_SYMBOL_GPL(pci_find_ext_capability); |
1da177e4 | 289 | |
687d5fe3 ME |
290 | static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap) |
291 | { | |
292 | int rc, ttl = PCI_FIND_CAP_TTL; | |
293 | u8 cap, mask; | |
294 | ||
295 | if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST) | |
296 | mask = HT_3BIT_CAP_MASK; | |
297 | else | |
298 | mask = HT_5BIT_CAP_MASK; | |
299 | ||
300 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos, | |
301 | PCI_CAP_ID_HT, &ttl); | |
302 | while (pos) { | |
303 | rc = pci_read_config_byte(dev, pos + 3, &cap); | |
304 | if (rc != PCIBIOS_SUCCESSFUL) | |
305 | return 0; | |
306 | ||
307 | if ((cap & mask) == ht_cap) | |
308 | return pos; | |
309 | ||
47a4d5be BG |
310 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, |
311 | pos + PCI_CAP_LIST_NEXT, | |
687d5fe3 ME |
312 | PCI_CAP_ID_HT, &ttl); |
313 | } | |
314 | ||
315 | return 0; | |
316 | } | |
317 | /** | |
318 | * pci_find_next_ht_capability - query a device's Hypertransport capabilities | |
319 | * @dev: PCI device to query | |
320 | * @pos: Position from which to continue searching | |
321 | * @ht_cap: Hypertransport capability code | |
322 | * | |
323 | * To be used in conjunction with pci_find_ht_capability() to search for | |
324 | * all capabilities matching @ht_cap. @pos should always be a value returned | |
325 | * from pci_find_ht_capability(). | |
326 | * | |
327 | * NB. To be 100% safe against broken PCI devices, the caller should take | |
328 | * steps to avoid an infinite loop. | |
329 | */ | |
330 | int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap) | |
331 | { | |
332 | return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap); | |
333 | } | |
334 | EXPORT_SYMBOL_GPL(pci_find_next_ht_capability); | |
335 | ||
336 | /** | |
337 | * pci_find_ht_capability - query a device's Hypertransport capabilities | |
338 | * @dev: PCI device to query | |
339 | * @ht_cap: Hypertransport capability code | |
340 | * | |
341 | * Tell if a device supports a given Hypertransport capability. | |
342 | * Returns an address within the device's PCI configuration space | |
343 | * or 0 in case the device does not support the request capability. | |
344 | * The address points to the PCI capability, of type PCI_CAP_ID_HT, | |
345 | * which has a Hypertransport capability matching @ht_cap. | |
346 | */ | |
347 | int pci_find_ht_capability(struct pci_dev *dev, int ht_cap) | |
348 | { | |
349 | int pos; | |
350 | ||
351 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); | |
352 | if (pos) | |
353 | pos = __pci_find_next_ht_cap(dev, pos, ht_cap); | |
354 | ||
355 | return pos; | |
356 | } | |
357 | EXPORT_SYMBOL_GPL(pci_find_ht_capability); | |
358 | ||
1da177e4 LT |
359 | /** |
360 | * pci_find_parent_resource - return resource region of parent bus of given region | |
361 | * @dev: PCI device structure contains resources to be searched | |
362 | * @res: child resource record for which parent is sought | |
363 | * | |
364 | * For given resource region of given device, return the resource | |
365 | * region of parent bus the given region is contained in or where | |
366 | * it should be allocated from. | |
367 | */ | |
368 | struct resource * | |
369 | pci_find_parent_resource(const struct pci_dev *dev, struct resource *res) | |
370 | { | |
371 | const struct pci_bus *bus = dev->bus; | |
372 | int i; | |
373 | struct resource *best = NULL; | |
374 | ||
375 | for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { | |
376 | struct resource *r = bus->resource[i]; | |
377 | if (!r) | |
378 | continue; | |
379 | if (res->start && !(res->start >= r->start && res->end <= r->end)) | |
380 | continue; /* Not contained */ | |
381 | if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM)) | |
382 | continue; /* Wrong type */ | |
383 | if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH)) | |
384 | return r; /* Exact match */ | |
385 | if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH)) | |
386 | best = r; /* Approximating prefetchable by non-prefetchable */ | |
387 | } | |
388 | return best; | |
389 | } | |
390 | ||
064b53db JL |
391 | /** |
392 | * pci_restore_bars - restore a devices BAR values (e.g. after wake-up) | |
393 | * @dev: PCI device to have its BARs restored | |
394 | * | |
395 | * Restore the BAR values for a given device, so as to make it | |
396 | * accessible by its driver. | |
397 | */ | |
ad668599 | 398 | static void |
064b53db JL |
399 | pci_restore_bars(struct pci_dev *dev) |
400 | { | |
bc5f5a82 | 401 | int i; |
064b53db | 402 | |
bc5f5a82 | 403 | for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) |
14add80b | 404 | pci_update_resource(dev, i); |
064b53db JL |
405 | } |
406 | ||
961d9120 RW |
407 | static struct pci_platform_pm_ops *pci_platform_pm; |
408 | ||
409 | int pci_set_platform_pm(struct pci_platform_pm_ops *ops) | |
410 | { | |
eb9d0fe4 RW |
411 | if (!ops->is_manageable || !ops->set_state || !ops->choose_state |
412 | || !ops->sleep_wake || !ops->can_wakeup) | |
961d9120 RW |
413 | return -EINVAL; |
414 | pci_platform_pm = ops; | |
415 | return 0; | |
416 | } | |
417 | ||
418 | static inline bool platform_pci_power_manageable(struct pci_dev *dev) | |
419 | { | |
420 | return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false; | |
421 | } | |
422 | ||
423 | static inline int platform_pci_set_power_state(struct pci_dev *dev, | |
424 | pci_power_t t) | |
425 | { | |
426 | return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS; | |
427 | } | |
428 | ||
429 | static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev) | |
430 | { | |
431 | return pci_platform_pm ? | |
432 | pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR; | |
433 | } | |
8f7020d3 | 434 | |
eb9d0fe4 RW |
435 | static inline bool platform_pci_can_wakeup(struct pci_dev *dev) |
436 | { | |
437 | return pci_platform_pm ? pci_platform_pm->can_wakeup(dev) : false; | |
438 | } | |
439 | ||
440 | static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable) | |
441 | { | |
442 | return pci_platform_pm ? | |
443 | pci_platform_pm->sleep_wake(dev, enable) : -ENODEV; | |
444 | } | |
445 | ||
1da177e4 | 446 | /** |
44e4e66e RW |
447 | * pci_raw_set_power_state - Use PCI PM registers to set the power state of |
448 | * given PCI device | |
449 | * @dev: PCI device to handle. | |
44e4e66e | 450 | * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. |
1da177e4 | 451 | * |
44e4e66e RW |
452 | * RETURN VALUE: |
453 | * -EINVAL if the requested state is invalid. | |
454 | * -EIO if device does not support PCI PM or its PM capabilities register has a | |
455 | * wrong version, or device doesn't support the requested state. | |
456 | * 0 if device already is in the requested state. | |
457 | * 0 if device's power state has been successfully changed. | |
1da177e4 | 458 | */ |
f00a20ef | 459 | static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) |
1da177e4 | 460 | { |
337001b6 | 461 | u16 pmcsr; |
44e4e66e | 462 | bool need_restore = false; |
1da177e4 | 463 | |
4a865905 RW |
464 | /* Check if we're already there */ |
465 | if (dev->current_state == state) | |
466 | return 0; | |
467 | ||
337001b6 | 468 | if (!dev->pm_cap) |
cca03dec AL |
469 | return -EIO; |
470 | ||
44e4e66e RW |
471 | if (state < PCI_D0 || state > PCI_D3hot) |
472 | return -EINVAL; | |
473 | ||
1da177e4 LT |
474 | /* Validate current state: |
475 | * Can enter D0 from any state, but if we can only go deeper | |
476 | * to sleep if we're already in a low power state | |
477 | */ | |
4a865905 | 478 | if (state != PCI_D0 && dev->current_state <= PCI_D3cold |
44e4e66e | 479 | && dev->current_state > state) { |
80ccba11 BH |
480 | dev_err(&dev->dev, "invalid power transition " |
481 | "(from state %d to %d)\n", dev->current_state, state); | |
1da177e4 | 482 | return -EINVAL; |
44e4e66e | 483 | } |
1da177e4 | 484 | |
1da177e4 | 485 | /* check if this device supports the desired state */ |
337001b6 RW |
486 | if ((state == PCI_D1 && !dev->d1_support) |
487 | || (state == PCI_D2 && !dev->d2_support)) | |
3fe9d19f | 488 | return -EIO; |
1da177e4 | 489 | |
337001b6 | 490 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
064b53db | 491 | |
32a36585 | 492 | /* If we're (effectively) in D3, force entire word to 0. |
1da177e4 LT |
493 | * This doesn't affect PME_Status, disables PME_En, and |
494 | * sets PowerState to 0. | |
495 | */ | |
32a36585 | 496 | switch (dev->current_state) { |
d3535fbb JL |
497 | case PCI_D0: |
498 | case PCI_D1: | |
499 | case PCI_D2: | |
500 | pmcsr &= ~PCI_PM_CTRL_STATE_MASK; | |
501 | pmcsr |= state; | |
502 | break; | |
f62795f1 RW |
503 | case PCI_D3hot: |
504 | case PCI_D3cold: | |
32a36585 JL |
505 | case PCI_UNKNOWN: /* Boot-up */ |
506 | if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot | |
f00a20ef | 507 | && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) |
44e4e66e | 508 | need_restore = true; |
32a36585 | 509 | /* Fall-through: force to D0 */ |
32a36585 | 510 | default: |
d3535fbb | 511 | pmcsr = 0; |
32a36585 | 512 | break; |
1da177e4 LT |
513 | } |
514 | ||
515 | /* enter specified state */ | |
337001b6 | 516 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
1da177e4 LT |
517 | |
518 | /* Mandatory power management transition delays */ | |
519 | /* see PCI PM 1.1 5.6.1 table 18 */ | |
520 | if (state == PCI_D3hot || dev->current_state == PCI_D3hot) | |
ffadcc2f | 521 | msleep(pci_pm_d3_delay); |
1da177e4 | 522 | else if (state == PCI_D2 || dev->current_state == PCI_D2) |
aa8c6c93 | 523 | udelay(PCI_PM_D2_DELAY); |
1da177e4 | 524 | |
e13cdbd7 RW |
525 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
526 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); | |
527 | if (dev->current_state != state && printk_ratelimit()) | |
528 | dev_info(&dev->dev, "Refused to change power state, " | |
529 | "currently in D%d\n", dev->current_state); | |
064b53db JL |
530 | |
531 | /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT | |
532 | * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning | |
533 | * from D3hot to D0 _may_ perform an internal reset, thereby | |
534 | * going to "D0 Uninitialized" rather than "D0 Initialized". | |
535 | * For example, at least some versions of the 3c905B and the | |
536 | * 3c556B exhibit this behaviour. | |
537 | * | |
538 | * At least some laptop BIOSen (e.g. the Thinkpad T21) leave | |
539 | * devices in a D3hot state at boot. Consequently, we need to | |
540 | * restore at least the BARs so that the device will be | |
541 | * accessible to its driver. | |
542 | */ | |
543 | if (need_restore) | |
544 | pci_restore_bars(dev); | |
545 | ||
f00a20ef | 546 | if (dev->bus->self) |
7d715a6c SL |
547 | pcie_aspm_pm_state_change(dev->bus->self); |
548 | ||
1da177e4 LT |
549 | return 0; |
550 | } | |
551 | ||
44e4e66e RW |
552 | /** |
553 | * pci_update_current_state - Read PCI power state of given device from its | |
554 | * PCI PM registers and cache it | |
555 | * @dev: PCI device to handle. | |
f06fc0b6 | 556 | * @state: State to cache in case the device doesn't have the PM capability |
44e4e66e | 557 | */ |
73410429 | 558 | void pci_update_current_state(struct pci_dev *dev, pci_power_t state) |
44e4e66e | 559 | { |
337001b6 | 560 | if (dev->pm_cap) { |
44e4e66e RW |
561 | u16 pmcsr; |
562 | ||
337001b6 | 563 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
44e4e66e | 564 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); |
f06fc0b6 RW |
565 | } else { |
566 | dev->current_state = state; | |
44e4e66e RW |
567 | } |
568 | } | |
569 | ||
0e5dd46b RW |
570 | /** |
571 | * pci_platform_power_transition - Use platform to change device power state | |
572 | * @dev: PCI device to handle. | |
573 | * @state: State to put the device into. | |
574 | */ | |
575 | static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state) | |
576 | { | |
577 | int error; | |
578 | ||
579 | if (platform_pci_power_manageable(dev)) { | |
580 | error = platform_pci_set_power_state(dev, state); | |
581 | if (!error) | |
582 | pci_update_current_state(dev, state); | |
583 | } else { | |
584 | error = -ENODEV; | |
585 | /* Fall back to PCI_D0 if native PM is not supported */ | |
b3bad72e RW |
586 | if (!dev->pm_cap) |
587 | dev->current_state = PCI_D0; | |
0e5dd46b RW |
588 | } |
589 | ||
590 | return error; | |
591 | } | |
592 | ||
593 | /** | |
594 | * __pci_start_power_transition - Start power transition of a PCI device | |
595 | * @dev: PCI device to handle. | |
596 | * @state: State to put the device into. | |
597 | */ | |
598 | static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) | |
599 | { | |
600 | if (state == PCI_D0) | |
601 | pci_platform_power_transition(dev, PCI_D0); | |
602 | } | |
603 | ||
604 | /** | |
605 | * __pci_complete_power_transition - Complete power transition of a PCI device | |
606 | * @dev: PCI device to handle. | |
607 | * @state: State to put the device into. | |
608 | * | |
609 | * This function should not be called directly by device drivers. | |
610 | */ | |
611 | int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state) | |
612 | { | |
613 | return state > PCI_D0 ? | |
614 | pci_platform_power_transition(dev, state) : -EINVAL; | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(__pci_complete_power_transition); | |
617 | ||
44e4e66e RW |
618 | /** |
619 | * pci_set_power_state - Set the power state of a PCI device | |
620 | * @dev: PCI device to handle. | |
621 | * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. | |
622 | * | |
877d0310 | 623 | * Transition a device to a new power state, using the platform firmware and/or |
44e4e66e RW |
624 | * the device's PCI PM registers. |
625 | * | |
626 | * RETURN VALUE: | |
627 | * -EINVAL if the requested state is invalid. | |
628 | * -EIO if device does not support PCI PM or its PM capabilities register has a | |
629 | * wrong version, or device doesn't support the requested state. | |
630 | * 0 if device already is in the requested state. | |
631 | * 0 if device's power state has been successfully changed. | |
632 | */ | |
633 | int pci_set_power_state(struct pci_dev *dev, pci_power_t state) | |
634 | { | |
337001b6 | 635 | int error; |
44e4e66e RW |
636 | |
637 | /* bound the state we're entering */ | |
638 | if (state > PCI_D3hot) | |
639 | state = PCI_D3hot; | |
640 | else if (state < PCI_D0) | |
641 | state = PCI_D0; | |
642 | else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) | |
643 | /* | |
644 | * If the device or the parent bridge do not support PCI PM, | |
645 | * ignore the request if we're doing anything other than putting | |
646 | * it into D0 (which would only happen on boot). | |
647 | */ | |
648 | return 0; | |
649 | ||
4a865905 RW |
650 | /* Check if we're already there */ |
651 | if (dev->current_state == state) | |
652 | return 0; | |
653 | ||
0e5dd46b RW |
654 | __pci_start_power_transition(dev, state); |
655 | ||
979b1791 AC |
656 | /* This device is quirked not to be put into D3, so |
657 | don't put it in D3 */ | |
658 | if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) | |
659 | return 0; | |
44e4e66e | 660 | |
f00a20ef | 661 | error = pci_raw_set_power_state(dev, state); |
44e4e66e | 662 | |
0e5dd46b RW |
663 | if (!__pci_complete_power_transition(dev, state)) |
664 | error = 0; | |
44e4e66e RW |
665 | |
666 | return error; | |
667 | } | |
668 | ||
1da177e4 LT |
669 | /** |
670 | * pci_choose_state - Choose the power state of a PCI device | |
671 | * @dev: PCI device to be suspended | |
672 | * @state: target sleep state for the whole system. This is the value | |
673 | * that is passed to suspend() function. | |
674 | * | |
675 | * Returns PCI power state suitable for given device and given system | |
676 | * message. | |
677 | */ | |
678 | ||
679 | pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state) | |
680 | { | |
ab826ca4 | 681 | pci_power_t ret; |
0f64474b | 682 | |
1da177e4 LT |
683 | if (!pci_find_capability(dev, PCI_CAP_ID_PM)) |
684 | return PCI_D0; | |
685 | ||
961d9120 RW |
686 | ret = platform_pci_choose_state(dev); |
687 | if (ret != PCI_POWER_ERROR) | |
688 | return ret; | |
ca078bae PM |
689 | |
690 | switch (state.event) { | |
691 | case PM_EVENT_ON: | |
692 | return PCI_D0; | |
693 | case PM_EVENT_FREEZE: | |
b887d2e6 DB |
694 | case PM_EVENT_PRETHAW: |
695 | /* REVISIT both freeze and pre-thaw "should" use D0 */ | |
ca078bae | 696 | case PM_EVENT_SUSPEND: |
3a2d5b70 | 697 | case PM_EVENT_HIBERNATE: |
ca078bae | 698 | return PCI_D3hot; |
1da177e4 | 699 | default: |
80ccba11 BH |
700 | dev_info(&dev->dev, "unrecognized suspend event %d\n", |
701 | state.event); | |
1da177e4 LT |
702 | BUG(); |
703 | } | |
704 | return PCI_D0; | |
705 | } | |
706 | ||
707 | EXPORT_SYMBOL(pci_choose_state); | |
708 | ||
89858517 YZ |
709 | #define PCI_EXP_SAVE_REGS 7 |
710 | ||
1b6b8ce2 YZ |
711 | #define pcie_cap_has_devctl(type, flags) 1 |
712 | #define pcie_cap_has_lnkctl(type, flags) \ | |
713 | ((flags & PCI_EXP_FLAGS_VERS) > 1 || \ | |
714 | (type == PCI_EXP_TYPE_ROOT_PORT || \ | |
715 | type == PCI_EXP_TYPE_ENDPOINT || \ | |
716 | type == PCI_EXP_TYPE_LEG_END)) | |
717 | #define pcie_cap_has_sltctl(type, flags) \ | |
718 | ((flags & PCI_EXP_FLAGS_VERS) > 1 || \ | |
719 | ((type == PCI_EXP_TYPE_ROOT_PORT) || \ | |
720 | (type == PCI_EXP_TYPE_DOWNSTREAM && \ | |
721 | (flags & PCI_EXP_FLAGS_SLOT)))) | |
722 | #define pcie_cap_has_rtctl(type, flags) \ | |
723 | ((flags & PCI_EXP_FLAGS_VERS) > 1 || \ | |
724 | (type == PCI_EXP_TYPE_ROOT_PORT || \ | |
725 | type == PCI_EXP_TYPE_RC_EC)) | |
726 | #define pcie_cap_has_devctl2(type, flags) \ | |
727 | ((flags & PCI_EXP_FLAGS_VERS) > 1) | |
728 | #define pcie_cap_has_lnkctl2(type, flags) \ | |
729 | ((flags & PCI_EXP_FLAGS_VERS) > 1) | |
730 | #define pcie_cap_has_sltctl2(type, flags) \ | |
731 | ((flags & PCI_EXP_FLAGS_VERS) > 1) | |
732 | ||
b56a5a23 MT |
733 | static int pci_save_pcie_state(struct pci_dev *dev) |
734 | { | |
735 | int pos, i = 0; | |
736 | struct pci_cap_saved_state *save_state; | |
737 | u16 *cap; | |
1b6b8ce2 | 738 | u16 flags; |
b56a5a23 MT |
739 | |
740 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
741 | if (pos <= 0) | |
742 | return 0; | |
743 | ||
9f35575d | 744 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); |
b56a5a23 | 745 | if (!save_state) { |
e496b617 | 746 | dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
b56a5a23 MT |
747 | return -ENOMEM; |
748 | } | |
749 | cap = (u16 *)&save_state->data[0]; | |
750 | ||
1b6b8ce2 YZ |
751 | pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &flags); |
752 | ||
753 | if (pcie_cap_has_devctl(dev->pcie_type, flags)) | |
754 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]); | |
755 | if (pcie_cap_has_lnkctl(dev->pcie_type, flags)) | |
756 | pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]); | |
757 | if (pcie_cap_has_sltctl(dev->pcie_type, flags)) | |
758 | pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]); | |
759 | if (pcie_cap_has_rtctl(dev->pcie_type, flags)) | |
760 | pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]); | |
761 | if (pcie_cap_has_devctl2(dev->pcie_type, flags)) | |
762 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &cap[i++]); | |
763 | if (pcie_cap_has_lnkctl2(dev->pcie_type, flags)) | |
764 | pci_read_config_word(dev, pos + PCI_EXP_LNKCTL2, &cap[i++]); | |
765 | if (pcie_cap_has_sltctl2(dev->pcie_type, flags)) | |
766 | pci_read_config_word(dev, pos + PCI_EXP_SLTCTL2, &cap[i++]); | |
63f4898a | 767 | |
b56a5a23 MT |
768 | return 0; |
769 | } | |
770 | ||
771 | static void pci_restore_pcie_state(struct pci_dev *dev) | |
772 | { | |
773 | int i = 0, pos; | |
774 | struct pci_cap_saved_state *save_state; | |
775 | u16 *cap; | |
1b6b8ce2 | 776 | u16 flags; |
b56a5a23 MT |
777 | |
778 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); | |
779 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
780 | if (!save_state || pos <= 0) | |
781 | return; | |
782 | cap = (u16 *)&save_state->data[0]; | |
783 | ||
1b6b8ce2 YZ |
784 | pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &flags); |
785 | ||
786 | if (pcie_cap_has_devctl(dev->pcie_type, flags)) | |
787 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]); | |
788 | if (pcie_cap_has_lnkctl(dev->pcie_type, flags)) | |
789 | pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]); | |
790 | if (pcie_cap_has_sltctl(dev->pcie_type, flags)) | |
791 | pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]); | |
792 | if (pcie_cap_has_rtctl(dev->pcie_type, flags)) | |
793 | pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]); | |
794 | if (pcie_cap_has_devctl2(dev->pcie_type, flags)) | |
795 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, cap[i++]); | |
796 | if (pcie_cap_has_lnkctl2(dev->pcie_type, flags)) | |
797 | pci_write_config_word(dev, pos + PCI_EXP_LNKCTL2, cap[i++]); | |
798 | if (pcie_cap_has_sltctl2(dev->pcie_type, flags)) | |
799 | pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]); | |
b56a5a23 MT |
800 | } |
801 | ||
cc692a5f SH |
802 | |
803 | static int pci_save_pcix_state(struct pci_dev *dev) | |
804 | { | |
63f4898a | 805 | int pos; |
cc692a5f | 806 | struct pci_cap_saved_state *save_state; |
cc692a5f SH |
807 | |
808 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
809 | if (pos <= 0) | |
810 | return 0; | |
811 | ||
f34303de | 812 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); |
cc692a5f | 813 | if (!save_state) { |
e496b617 | 814 | dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
cc692a5f SH |
815 | return -ENOMEM; |
816 | } | |
cc692a5f | 817 | |
63f4898a RW |
818 | pci_read_config_word(dev, pos + PCI_X_CMD, (u16 *)save_state->data); |
819 | ||
cc692a5f SH |
820 | return 0; |
821 | } | |
822 | ||
823 | static void pci_restore_pcix_state(struct pci_dev *dev) | |
824 | { | |
825 | int i = 0, pos; | |
826 | struct pci_cap_saved_state *save_state; | |
827 | u16 *cap; | |
828 | ||
829 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); | |
830 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
831 | if (!save_state || pos <= 0) | |
832 | return; | |
833 | cap = (u16 *)&save_state->data[0]; | |
834 | ||
835 | pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]); | |
cc692a5f SH |
836 | } |
837 | ||
838 | ||
1da177e4 LT |
839 | /** |
840 | * pci_save_state - save the PCI configuration space of a device before suspending | |
841 | * @dev: - PCI device that we're dealing with | |
1da177e4 LT |
842 | */ |
843 | int | |
844 | pci_save_state(struct pci_dev *dev) | |
845 | { | |
846 | int i; | |
847 | /* XXX: 100% dword access ok here? */ | |
848 | for (i = 0; i < 16; i++) | |
849 | pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]); | |
aa8c6c93 | 850 | dev->state_saved = true; |
b56a5a23 MT |
851 | if ((i = pci_save_pcie_state(dev)) != 0) |
852 | return i; | |
cc692a5f SH |
853 | if ((i = pci_save_pcix_state(dev)) != 0) |
854 | return i; | |
1da177e4 LT |
855 | return 0; |
856 | } | |
857 | ||
858 | /** | |
859 | * pci_restore_state - Restore the saved state of a PCI device | |
860 | * @dev: - PCI device that we're dealing with | |
1da177e4 LT |
861 | */ |
862 | int | |
863 | pci_restore_state(struct pci_dev *dev) | |
864 | { | |
865 | int i; | |
b4482a4b | 866 | u32 val; |
1da177e4 | 867 | |
c82f63e4 AD |
868 | if (!dev->state_saved) |
869 | return 0; | |
4b77b0a2 | 870 | |
b56a5a23 MT |
871 | /* PCI Express register must be restored first */ |
872 | pci_restore_pcie_state(dev); | |
873 | ||
8b8c8d28 YL |
874 | /* |
875 | * The Base Address register should be programmed before the command | |
876 | * register(s) | |
877 | */ | |
878 | for (i = 15; i >= 0; i--) { | |
04d9c1a1 DJ |
879 | pci_read_config_dword(dev, i * 4, &val); |
880 | if (val != dev->saved_config_space[i]) { | |
80ccba11 BH |
881 | dev_printk(KERN_DEBUG, &dev->dev, "restoring config " |
882 | "space at offset %#x (was %#x, writing %#x)\n", | |
883 | i, val, (int)dev->saved_config_space[i]); | |
04d9c1a1 DJ |
884 | pci_write_config_dword(dev,i * 4, |
885 | dev->saved_config_space[i]); | |
886 | } | |
887 | } | |
cc692a5f | 888 | pci_restore_pcix_state(dev); |
41017f0c | 889 | pci_restore_msi_state(dev); |
8c5cdb6a | 890 | pci_restore_iov_state(dev); |
8fed4b65 | 891 | |
4b77b0a2 RW |
892 | dev->state_saved = false; |
893 | ||
1da177e4 LT |
894 | return 0; |
895 | } | |
896 | ||
38cc1302 HS |
897 | static int do_pci_enable_device(struct pci_dev *dev, int bars) |
898 | { | |
899 | int err; | |
900 | ||
901 | err = pci_set_power_state(dev, PCI_D0); | |
902 | if (err < 0 && err != -EIO) | |
903 | return err; | |
904 | err = pcibios_enable_device(dev, bars); | |
905 | if (err < 0) | |
906 | return err; | |
907 | pci_fixup_device(pci_fixup_enable, dev); | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
912 | /** | |
0b62e13b | 913 | * pci_reenable_device - Resume abandoned device |
38cc1302 HS |
914 | * @dev: PCI device to be resumed |
915 | * | |
916 | * Note this function is a backend of pci_default_resume and is not supposed | |
917 | * to be called by normal code, write proper resume handler and use it instead. | |
918 | */ | |
0b62e13b | 919 | int pci_reenable_device(struct pci_dev *dev) |
38cc1302 | 920 | { |
296ccb08 | 921 | if (pci_is_enabled(dev)) |
38cc1302 HS |
922 | return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1); |
923 | return 0; | |
924 | } | |
925 | ||
b718989d BH |
926 | static int __pci_enable_device_flags(struct pci_dev *dev, |
927 | resource_size_t flags) | |
1da177e4 LT |
928 | { |
929 | int err; | |
b718989d | 930 | int i, bars = 0; |
1da177e4 | 931 | |
9fb625c3 HS |
932 | if (atomic_add_return(1, &dev->enable_cnt) > 1) |
933 | return 0; /* already enabled */ | |
934 | ||
b718989d BH |
935 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) |
936 | if (dev->resource[i].flags & flags) | |
937 | bars |= (1 << i); | |
938 | ||
38cc1302 | 939 | err = do_pci_enable_device(dev, bars); |
95a62965 | 940 | if (err < 0) |
38cc1302 | 941 | atomic_dec(&dev->enable_cnt); |
9fb625c3 | 942 | return err; |
1da177e4 LT |
943 | } |
944 | ||
b718989d BH |
945 | /** |
946 | * pci_enable_device_io - Initialize a device for use with IO space | |
947 | * @dev: PCI device to be initialized | |
948 | * | |
949 | * Initialize device before it's used by a driver. Ask low-level code | |
950 | * to enable I/O resources. Wake up the device if it was suspended. | |
951 | * Beware, this function can fail. | |
952 | */ | |
953 | int pci_enable_device_io(struct pci_dev *dev) | |
954 | { | |
955 | return __pci_enable_device_flags(dev, IORESOURCE_IO); | |
956 | } | |
957 | ||
958 | /** | |
959 | * pci_enable_device_mem - Initialize a device for use with Memory space | |
960 | * @dev: PCI device to be initialized | |
961 | * | |
962 | * Initialize device before it's used by a driver. Ask low-level code | |
963 | * to enable Memory resources. Wake up the device if it was suspended. | |
964 | * Beware, this function can fail. | |
965 | */ | |
966 | int pci_enable_device_mem(struct pci_dev *dev) | |
967 | { | |
968 | return __pci_enable_device_flags(dev, IORESOURCE_MEM); | |
969 | } | |
970 | ||
bae94d02 IPG |
971 | /** |
972 | * pci_enable_device - Initialize device before it's used by a driver. | |
973 | * @dev: PCI device to be initialized | |
974 | * | |
975 | * Initialize device before it's used by a driver. Ask low-level code | |
976 | * to enable I/O and memory. Wake up the device if it was suspended. | |
977 | * Beware, this function can fail. | |
978 | * | |
979 | * Note we don't actually enable the device many times if we call | |
980 | * this function repeatedly (we just increment the count). | |
981 | */ | |
982 | int pci_enable_device(struct pci_dev *dev) | |
983 | { | |
b718989d | 984 | return __pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); |
bae94d02 IPG |
985 | } |
986 | ||
9ac7849e TH |
987 | /* |
988 | * Managed PCI resources. This manages device on/off, intx/msi/msix | |
989 | * on/off and BAR regions. pci_dev itself records msi/msix status, so | |
990 | * there's no need to track it separately. pci_devres is initialized | |
991 | * when a device is enabled using managed PCI device enable interface. | |
992 | */ | |
993 | struct pci_devres { | |
7f375f32 TH |
994 | unsigned int enabled:1; |
995 | unsigned int pinned:1; | |
9ac7849e TH |
996 | unsigned int orig_intx:1; |
997 | unsigned int restore_intx:1; | |
998 | u32 region_mask; | |
999 | }; | |
1000 | ||
1001 | static void pcim_release(struct device *gendev, void *res) | |
1002 | { | |
1003 | struct pci_dev *dev = container_of(gendev, struct pci_dev, dev); | |
1004 | struct pci_devres *this = res; | |
1005 | int i; | |
1006 | ||
1007 | if (dev->msi_enabled) | |
1008 | pci_disable_msi(dev); | |
1009 | if (dev->msix_enabled) | |
1010 | pci_disable_msix(dev); | |
1011 | ||
1012 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) | |
1013 | if (this->region_mask & (1 << i)) | |
1014 | pci_release_region(dev, i); | |
1015 | ||
1016 | if (this->restore_intx) | |
1017 | pci_intx(dev, this->orig_intx); | |
1018 | ||
7f375f32 | 1019 | if (this->enabled && !this->pinned) |
9ac7849e TH |
1020 | pci_disable_device(dev); |
1021 | } | |
1022 | ||
1023 | static struct pci_devres * get_pci_dr(struct pci_dev *pdev) | |
1024 | { | |
1025 | struct pci_devres *dr, *new_dr; | |
1026 | ||
1027 | dr = devres_find(&pdev->dev, pcim_release, NULL, NULL); | |
1028 | if (dr) | |
1029 | return dr; | |
1030 | ||
1031 | new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL); | |
1032 | if (!new_dr) | |
1033 | return NULL; | |
1034 | return devres_get(&pdev->dev, new_dr, NULL, NULL); | |
1035 | } | |
1036 | ||
1037 | static struct pci_devres * find_pci_dr(struct pci_dev *pdev) | |
1038 | { | |
1039 | if (pci_is_managed(pdev)) | |
1040 | return devres_find(&pdev->dev, pcim_release, NULL, NULL); | |
1041 | return NULL; | |
1042 | } | |
1043 | ||
1044 | /** | |
1045 | * pcim_enable_device - Managed pci_enable_device() | |
1046 | * @pdev: PCI device to be initialized | |
1047 | * | |
1048 | * Managed pci_enable_device(). | |
1049 | */ | |
1050 | int pcim_enable_device(struct pci_dev *pdev) | |
1051 | { | |
1052 | struct pci_devres *dr; | |
1053 | int rc; | |
1054 | ||
1055 | dr = get_pci_dr(pdev); | |
1056 | if (unlikely(!dr)) | |
1057 | return -ENOMEM; | |
b95d58ea TH |
1058 | if (dr->enabled) |
1059 | return 0; | |
9ac7849e TH |
1060 | |
1061 | rc = pci_enable_device(pdev); | |
1062 | if (!rc) { | |
1063 | pdev->is_managed = 1; | |
7f375f32 | 1064 | dr->enabled = 1; |
9ac7849e TH |
1065 | } |
1066 | return rc; | |
1067 | } | |
1068 | ||
1069 | /** | |
1070 | * pcim_pin_device - Pin managed PCI device | |
1071 | * @pdev: PCI device to pin | |
1072 | * | |
1073 | * Pin managed PCI device @pdev. Pinned device won't be disabled on | |
1074 | * driver detach. @pdev must have been enabled with | |
1075 | * pcim_enable_device(). | |
1076 | */ | |
1077 | void pcim_pin_device(struct pci_dev *pdev) | |
1078 | { | |
1079 | struct pci_devres *dr; | |
1080 | ||
1081 | dr = find_pci_dr(pdev); | |
7f375f32 | 1082 | WARN_ON(!dr || !dr->enabled); |
9ac7849e | 1083 | if (dr) |
7f375f32 | 1084 | dr->pinned = 1; |
9ac7849e TH |
1085 | } |
1086 | ||
1da177e4 LT |
1087 | /** |
1088 | * pcibios_disable_device - disable arch specific PCI resources for device dev | |
1089 | * @dev: the PCI device to disable | |
1090 | * | |
1091 | * Disables architecture specific PCI resources for the device. This | |
1092 | * is the default implementation. Architecture implementations can | |
1093 | * override this. | |
1094 | */ | |
1095 | void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {} | |
1096 | ||
fa58d305 RW |
1097 | static void do_pci_disable_device(struct pci_dev *dev) |
1098 | { | |
1099 | u16 pci_command; | |
1100 | ||
1101 | pci_read_config_word(dev, PCI_COMMAND, &pci_command); | |
1102 | if (pci_command & PCI_COMMAND_MASTER) { | |
1103 | pci_command &= ~PCI_COMMAND_MASTER; | |
1104 | pci_write_config_word(dev, PCI_COMMAND, pci_command); | |
1105 | } | |
1106 | ||
1107 | pcibios_disable_device(dev); | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * pci_disable_enabled_device - Disable device without updating enable_cnt | |
1112 | * @dev: PCI device to disable | |
1113 | * | |
1114 | * NOTE: This function is a backend of PCI power management routines and is | |
1115 | * not supposed to be called drivers. | |
1116 | */ | |
1117 | void pci_disable_enabled_device(struct pci_dev *dev) | |
1118 | { | |
296ccb08 | 1119 | if (pci_is_enabled(dev)) |
fa58d305 RW |
1120 | do_pci_disable_device(dev); |
1121 | } | |
1122 | ||
1da177e4 LT |
1123 | /** |
1124 | * pci_disable_device - Disable PCI device after use | |
1125 | * @dev: PCI device to be disabled | |
1126 | * | |
1127 | * Signal to the system that the PCI device is not in use by the system | |
1128 | * anymore. This only involves disabling PCI bus-mastering, if active. | |
bae94d02 IPG |
1129 | * |
1130 | * Note we don't actually disable the device until all callers of | |
1131 | * pci_device_enable() have called pci_device_disable(). | |
1da177e4 LT |
1132 | */ |
1133 | void | |
1134 | pci_disable_device(struct pci_dev *dev) | |
1135 | { | |
9ac7849e | 1136 | struct pci_devres *dr; |
99dc804d | 1137 | |
9ac7849e TH |
1138 | dr = find_pci_dr(dev); |
1139 | if (dr) | |
7f375f32 | 1140 | dr->enabled = 0; |
9ac7849e | 1141 | |
bae94d02 IPG |
1142 | if (atomic_sub_return(1, &dev->enable_cnt) != 0) |
1143 | return; | |
1144 | ||
fa58d305 | 1145 | do_pci_disable_device(dev); |
1da177e4 | 1146 | |
fa58d305 | 1147 | dev->is_busmaster = 0; |
1da177e4 LT |
1148 | } |
1149 | ||
f7bdd12d BK |
1150 | /** |
1151 | * pcibios_set_pcie_reset_state - set reset state for device dev | |
1152 | * @dev: the PCI-E device reset | |
1153 | * @state: Reset state to enter into | |
1154 | * | |
1155 | * | |
1156 | * Sets the PCI-E reset state for the device. This is the default | |
1157 | * implementation. Architecture implementations can override this. | |
1158 | */ | |
1159 | int __attribute__ ((weak)) pcibios_set_pcie_reset_state(struct pci_dev *dev, | |
1160 | enum pcie_reset_state state) | |
1161 | { | |
1162 | return -EINVAL; | |
1163 | } | |
1164 | ||
1165 | /** | |
1166 | * pci_set_pcie_reset_state - set reset state for device dev | |
1167 | * @dev: the PCI-E device reset | |
1168 | * @state: Reset state to enter into | |
1169 | * | |
1170 | * | |
1171 | * Sets the PCI reset state for the device. | |
1172 | */ | |
1173 | int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) | |
1174 | { | |
1175 | return pcibios_set_pcie_reset_state(dev, state); | |
1176 | } | |
1177 | ||
eb9d0fe4 RW |
1178 | /** |
1179 | * pci_pme_capable - check the capability of PCI device to generate PME# | |
1180 | * @dev: PCI device to handle. | |
eb9d0fe4 RW |
1181 | * @state: PCI state from which device will issue PME#. |
1182 | */ | |
e5899e1b | 1183 | bool pci_pme_capable(struct pci_dev *dev, pci_power_t state) |
eb9d0fe4 | 1184 | { |
337001b6 | 1185 | if (!dev->pm_cap) |
eb9d0fe4 RW |
1186 | return false; |
1187 | ||
337001b6 | 1188 | return !!(dev->pme_support & (1 << state)); |
eb9d0fe4 RW |
1189 | } |
1190 | ||
1191 | /** | |
1192 | * pci_pme_active - enable or disable PCI device's PME# function | |
1193 | * @dev: PCI device to handle. | |
eb9d0fe4 RW |
1194 | * @enable: 'true' to enable PME# generation; 'false' to disable it. |
1195 | * | |
1196 | * The caller must verify that the device is capable of generating PME# before | |
1197 | * calling this function with @enable equal to 'true'. | |
1198 | */ | |
5a6c9b60 | 1199 | void pci_pme_active(struct pci_dev *dev, bool enable) |
eb9d0fe4 RW |
1200 | { |
1201 | u16 pmcsr; | |
1202 | ||
337001b6 | 1203 | if (!dev->pm_cap) |
eb9d0fe4 RW |
1204 | return; |
1205 | ||
337001b6 | 1206 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
eb9d0fe4 RW |
1207 | /* Clear PME_Status by writing 1 to it and enable PME# */ |
1208 | pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE; | |
1209 | if (!enable) | |
1210 | pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; | |
1211 | ||
337001b6 | 1212 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
eb9d0fe4 | 1213 | |
10c3d71d | 1214 | dev_printk(KERN_DEBUG, &dev->dev, "PME# %s\n", |
eb9d0fe4 RW |
1215 | enable ? "enabled" : "disabled"); |
1216 | } | |
1217 | ||
1da177e4 | 1218 | /** |
075c1771 DB |
1219 | * pci_enable_wake - enable PCI device as wakeup event source |
1220 | * @dev: PCI device affected | |
1221 | * @state: PCI state from which device will issue wakeup events | |
1222 | * @enable: True to enable event generation; false to disable | |
1223 | * | |
1224 | * This enables the device as a wakeup event source, or disables it. | |
1225 | * When such events involves platform-specific hooks, those hooks are | |
1226 | * called automatically by this routine. | |
1227 | * | |
1228 | * Devices with legacy power management (no standard PCI PM capabilities) | |
eb9d0fe4 | 1229 | * always require such platform hooks. |
075c1771 | 1230 | * |
eb9d0fe4 RW |
1231 | * RETURN VALUE: |
1232 | * 0 is returned on success | |
1233 | * -EINVAL is returned if device is not supposed to wake up the system | |
1234 | * Error code depending on the platform is returned if both the platform and | |
1235 | * the native mechanism fail to enable the generation of wake-up events | |
1da177e4 | 1236 | */ |
7d9a73f6 | 1237 | int pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable) |
1da177e4 | 1238 | { |
5bcc2fb4 | 1239 | int ret = 0; |
075c1771 | 1240 | |
bebd590c | 1241 | if (enable && !device_may_wakeup(&dev->dev)) |
eb9d0fe4 | 1242 | return -EINVAL; |
1da177e4 | 1243 | |
e80bb09d RW |
1244 | /* Don't do the same thing twice in a row for one device. */ |
1245 | if (!!enable == !!dev->wakeup_prepared) | |
1246 | return 0; | |
1247 | ||
eb9d0fe4 RW |
1248 | /* |
1249 | * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don | |
1250 | * Anderson we should be doing PME# wake enable followed by ACPI wake | |
1251 | * enable. To disable wake-up we call the platform first, for symmetry. | |
075c1771 | 1252 | */ |
1da177e4 | 1253 | |
5bcc2fb4 RW |
1254 | if (enable) { |
1255 | int error; | |
1da177e4 | 1256 | |
5bcc2fb4 RW |
1257 | if (pci_pme_capable(dev, state)) |
1258 | pci_pme_active(dev, true); | |
1259 | else | |
1260 | ret = 1; | |
eb9d0fe4 | 1261 | error = platform_pci_sleep_wake(dev, true); |
5bcc2fb4 RW |
1262 | if (ret) |
1263 | ret = error; | |
e80bb09d RW |
1264 | if (!ret) |
1265 | dev->wakeup_prepared = true; | |
5bcc2fb4 RW |
1266 | } else { |
1267 | platform_pci_sleep_wake(dev, false); | |
1268 | pci_pme_active(dev, false); | |
e80bb09d | 1269 | dev->wakeup_prepared = false; |
5bcc2fb4 | 1270 | } |
1da177e4 | 1271 | |
5bcc2fb4 | 1272 | return ret; |
eb9d0fe4 | 1273 | } |
1da177e4 | 1274 | |
0235c4fc RW |
1275 | /** |
1276 | * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold | |
1277 | * @dev: PCI device to prepare | |
1278 | * @enable: True to enable wake-up event generation; false to disable | |
1279 | * | |
1280 | * Many drivers want the device to wake up the system from D3_hot or D3_cold | |
1281 | * and this function allows them to set that up cleanly - pci_enable_wake() | |
1282 | * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI | |
1283 | * ordering constraints. | |
1284 | * | |
1285 | * This function only returns error code if the device is not capable of | |
1286 | * generating PME# from both D3_hot and D3_cold, and the platform is unable to | |
1287 | * enable wake-up power for it. | |
1288 | */ | |
1289 | int pci_wake_from_d3(struct pci_dev *dev, bool enable) | |
1290 | { | |
1291 | return pci_pme_capable(dev, PCI_D3cold) ? | |
1292 | pci_enable_wake(dev, PCI_D3cold, enable) : | |
1293 | pci_enable_wake(dev, PCI_D3hot, enable); | |
1294 | } | |
1295 | ||
404cc2d8 | 1296 | /** |
37139074 JB |
1297 | * pci_target_state - find an appropriate low power state for a given PCI dev |
1298 | * @dev: PCI device | |
1299 | * | |
1300 | * Use underlying platform code to find a supported low power state for @dev. | |
1301 | * If the platform can't manage @dev, return the deepest state from which it | |
1302 | * can generate wake events, based on any available PME info. | |
404cc2d8 | 1303 | */ |
e5899e1b | 1304 | pci_power_t pci_target_state(struct pci_dev *dev) |
404cc2d8 RW |
1305 | { |
1306 | pci_power_t target_state = PCI_D3hot; | |
404cc2d8 RW |
1307 | |
1308 | if (platform_pci_power_manageable(dev)) { | |
1309 | /* | |
1310 | * Call the platform to choose the target state of the device | |
1311 | * and enable wake-up from this state if supported. | |
1312 | */ | |
1313 | pci_power_t state = platform_pci_choose_state(dev); | |
1314 | ||
1315 | switch (state) { | |
1316 | case PCI_POWER_ERROR: | |
1317 | case PCI_UNKNOWN: | |
1318 | break; | |
1319 | case PCI_D1: | |
1320 | case PCI_D2: | |
1321 | if (pci_no_d1d2(dev)) | |
1322 | break; | |
1323 | default: | |
1324 | target_state = state; | |
404cc2d8 | 1325 | } |
d2abdf62 RW |
1326 | } else if (!dev->pm_cap) { |
1327 | target_state = PCI_D0; | |
404cc2d8 RW |
1328 | } else if (device_may_wakeup(&dev->dev)) { |
1329 | /* | |
1330 | * Find the deepest state from which the device can generate | |
1331 | * wake-up events, make it the target state and enable device | |
1332 | * to generate PME#. | |
1333 | */ | |
337001b6 RW |
1334 | if (dev->pme_support) { |
1335 | while (target_state | |
1336 | && !(dev->pme_support & (1 << target_state))) | |
1337 | target_state--; | |
404cc2d8 RW |
1338 | } |
1339 | } | |
1340 | ||
e5899e1b RW |
1341 | return target_state; |
1342 | } | |
1343 | ||
1344 | /** | |
1345 | * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state | |
1346 | * @dev: Device to handle. | |
1347 | * | |
1348 | * Choose the power state appropriate for the device depending on whether | |
1349 | * it can wake up the system and/or is power manageable by the platform | |
1350 | * (PCI_D3hot is the default) and put the device into that state. | |
1351 | */ | |
1352 | int pci_prepare_to_sleep(struct pci_dev *dev) | |
1353 | { | |
1354 | pci_power_t target_state = pci_target_state(dev); | |
1355 | int error; | |
1356 | ||
1357 | if (target_state == PCI_POWER_ERROR) | |
1358 | return -EIO; | |
1359 | ||
8efb8c76 | 1360 | pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev)); |
c157dfa3 | 1361 | |
404cc2d8 RW |
1362 | error = pci_set_power_state(dev, target_state); |
1363 | ||
1364 | if (error) | |
1365 | pci_enable_wake(dev, target_state, false); | |
1366 | ||
1367 | return error; | |
1368 | } | |
1369 | ||
1370 | /** | |
443bd1c4 | 1371 | * pci_back_from_sleep - turn PCI device on during system-wide transition into working state |
404cc2d8 RW |
1372 | * @dev: Device to handle. |
1373 | * | |
1374 | * Disable device's sytem wake-up capability and put it into D0. | |
1375 | */ | |
1376 | int pci_back_from_sleep(struct pci_dev *dev) | |
1377 | { | |
1378 | pci_enable_wake(dev, PCI_D0, false); | |
1379 | return pci_set_power_state(dev, PCI_D0); | |
1380 | } | |
1381 | ||
eb9d0fe4 RW |
1382 | /** |
1383 | * pci_pm_init - Initialize PM functions of given PCI device | |
1384 | * @dev: PCI device to handle. | |
1385 | */ | |
1386 | void pci_pm_init(struct pci_dev *dev) | |
1387 | { | |
1388 | int pm; | |
1389 | u16 pmc; | |
1da177e4 | 1390 | |
e80bb09d | 1391 | dev->wakeup_prepared = false; |
337001b6 RW |
1392 | dev->pm_cap = 0; |
1393 | ||
eb9d0fe4 RW |
1394 | /* find PCI PM capability in list */ |
1395 | pm = pci_find_capability(dev, PCI_CAP_ID_PM); | |
1396 | if (!pm) | |
50246dd4 | 1397 | return; |
eb9d0fe4 RW |
1398 | /* Check device's ability to generate PME# */ |
1399 | pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc); | |
075c1771 | 1400 | |
eb9d0fe4 RW |
1401 | if ((pmc & PCI_PM_CAP_VER_MASK) > 3) { |
1402 | dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n", | |
1403 | pmc & PCI_PM_CAP_VER_MASK); | |
50246dd4 | 1404 | return; |
eb9d0fe4 RW |
1405 | } |
1406 | ||
337001b6 RW |
1407 | dev->pm_cap = pm; |
1408 | ||
1409 | dev->d1_support = false; | |
1410 | dev->d2_support = false; | |
1411 | if (!pci_no_d1d2(dev)) { | |
c9ed77ee | 1412 | if (pmc & PCI_PM_CAP_D1) |
337001b6 | 1413 | dev->d1_support = true; |
c9ed77ee | 1414 | if (pmc & PCI_PM_CAP_D2) |
337001b6 | 1415 | dev->d2_support = true; |
c9ed77ee BH |
1416 | |
1417 | if (dev->d1_support || dev->d2_support) | |
1418 | dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n", | |
ec84f126 JB |
1419 | dev->d1_support ? " D1" : "", |
1420 | dev->d2_support ? " D2" : ""); | |
337001b6 RW |
1421 | } |
1422 | ||
1423 | pmc &= PCI_PM_CAP_PME_MASK; | |
1424 | if (pmc) { | |
10c3d71d BH |
1425 | dev_printk(KERN_DEBUG, &dev->dev, |
1426 | "PME# supported from%s%s%s%s%s\n", | |
c9ed77ee BH |
1427 | (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "", |
1428 | (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "", | |
1429 | (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "", | |
1430 | (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "", | |
1431 | (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : ""); | |
337001b6 | 1432 | dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT; |
eb9d0fe4 RW |
1433 | /* |
1434 | * Make device's PM flags reflect the wake-up capability, but | |
1435 | * let the user space enable it to wake up the system as needed. | |
1436 | */ | |
1437 | device_set_wakeup_capable(&dev->dev, true); | |
1438 | device_set_wakeup_enable(&dev->dev, false); | |
1439 | /* Disable the PME# generation functionality */ | |
337001b6 RW |
1440 | pci_pme_active(dev, false); |
1441 | } else { | |
1442 | dev->pme_support = 0; | |
eb9d0fe4 | 1443 | } |
1da177e4 LT |
1444 | } |
1445 | ||
eb9c39d0 JB |
1446 | /** |
1447 | * platform_pci_wakeup_init - init platform wakeup if present | |
1448 | * @dev: PCI device | |
1449 | * | |
1450 | * Some devices don't have PCI PM caps but can still generate wakeup | |
1451 | * events through platform methods (like ACPI events). If @dev supports | |
1452 | * platform wakeup events, set the device flag to indicate as much. This | |
1453 | * may be redundant if the device also supports PCI PM caps, but double | |
1454 | * initialization should be safe in that case. | |
1455 | */ | |
1456 | void platform_pci_wakeup_init(struct pci_dev *dev) | |
1457 | { | |
1458 | if (!platform_pci_can_wakeup(dev)) | |
1459 | return; | |
1460 | ||
1461 | device_set_wakeup_capable(&dev->dev, true); | |
1462 | device_set_wakeup_enable(&dev->dev, false); | |
1463 | platform_pci_sleep_wake(dev, false); | |
1464 | } | |
1465 | ||
63f4898a RW |
1466 | /** |
1467 | * pci_add_save_buffer - allocate buffer for saving given capability registers | |
1468 | * @dev: the PCI device | |
1469 | * @cap: the capability to allocate the buffer for | |
1470 | * @size: requested size of the buffer | |
1471 | */ | |
1472 | static int pci_add_cap_save_buffer( | |
1473 | struct pci_dev *dev, char cap, unsigned int size) | |
1474 | { | |
1475 | int pos; | |
1476 | struct pci_cap_saved_state *save_state; | |
1477 | ||
1478 | pos = pci_find_capability(dev, cap); | |
1479 | if (pos <= 0) | |
1480 | return 0; | |
1481 | ||
1482 | save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL); | |
1483 | if (!save_state) | |
1484 | return -ENOMEM; | |
1485 | ||
1486 | save_state->cap_nr = cap; | |
1487 | pci_add_saved_cap(dev, save_state); | |
1488 | ||
1489 | return 0; | |
1490 | } | |
1491 | ||
1492 | /** | |
1493 | * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities | |
1494 | * @dev: the PCI device | |
1495 | */ | |
1496 | void pci_allocate_cap_save_buffers(struct pci_dev *dev) | |
1497 | { | |
1498 | int error; | |
1499 | ||
89858517 YZ |
1500 | error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, |
1501 | PCI_EXP_SAVE_REGS * sizeof(u16)); | |
63f4898a RW |
1502 | if (error) |
1503 | dev_err(&dev->dev, | |
1504 | "unable to preallocate PCI Express save buffer\n"); | |
1505 | ||
1506 | error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16)); | |
1507 | if (error) | |
1508 | dev_err(&dev->dev, | |
1509 | "unable to preallocate PCI-X save buffer\n"); | |
1510 | } | |
1511 | ||
58c3a727 YZ |
1512 | /** |
1513 | * pci_enable_ari - enable ARI forwarding if hardware support it | |
1514 | * @dev: the PCI device | |
1515 | */ | |
1516 | void pci_enable_ari(struct pci_dev *dev) | |
1517 | { | |
1518 | int pos; | |
1519 | u32 cap; | |
1520 | u16 ctrl; | |
8113587c | 1521 | struct pci_dev *bridge; |
58c3a727 | 1522 | |
8113587c | 1523 | if (!dev->is_pcie || dev->devfn) |
58c3a727 YZ |
1524 | return; |
1525 | ||
8113587c ZY |
1526 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); |
1527 | if (!pos) | |
58c3a727 YZ |
1528 | return; |
1529 | ||
8113587c ZY |
1530 | bridge = dev->bus->self; |
1531 | if (!bridge || !bridge->is_pcie) | |
1532 | return; | |
1533 | ||
1534 | pos = pci_find_capability(bridge, PCI_CAP_ID_EXP); | |
58c3a727 YZ |
1535 | if (!pos) |
1536 | return; | |
1537 | ||
8113587c | 1538 | pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2, &cap); |
58c3a727 YZ |
1539 | if (!(cap & PCI_EXP_DEVCAP2_ARI)) |
1540 | return; | |
1541 | ||
8113587c | 1542 | pci_read_config_word(bridge, pos + PCI_EXP_DEVCTL2, &ctrl); |
58c3a727 | 1543 | ctrl |= PCI_EXP_DEVCTL2_ARI; |
8113587c | 1544 | pci_write_config_word(bridge, pos + PCI_EXP_DEVCTL2, ctrl); |
58c3a727 | 1545 | |
8113587c | 1546 | bridge->ari_enabled = 1; |
58c3a727 YZ |
1547 | } |
1548 | ||
ae21ee65 AK |
1549 | /** |
1550 | * pci_enable_acs - enable ACS if hardware support it | |
1551 | * @dev: the PCI device | |
1552 | */ | |
1553 | void pci_enable_acs(struct pci_dev *dev) | |
1554 | { | |
1555 | int pos; | |
1556 | u16 cap; | |
1557 | u16 ctrl; | |
1558 | ||
1559 | if (!dev->is_pcie) | |
1560 | return; | |
1561 | ||
1562 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); | |
1563 | if (!pos) | |
1564 | return; | |
1565 | ||
1566 | pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap); | |
1567 | pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl); | |
1568 | ||
1569 | /* Source Validation */ | |
1570 | ctrl |= (cap & PCI_ACS_SV); | |
1571 | ||
1572 | /* P2P Request Redirect */ | |
1573 | ctrl |= (cap & PCI_ACS_RR); | |
1574 | ||
1575 | /* P2P Completion Redirect */ | |
1576 | ctrl |= (cap & PCI_ACS_CR); | |
1577 | ||
1578 | /* Upstream Forwarding */ | |
1579 | ctrl |= (cap & PCI_ACS_UF); | |
1580 | ||
1581 | pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl); | |
1582 | } | |
1583 | ||
57c2cf71 BH |
1584 | /** |
1585 | * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge | |
1586 | * @dev: the PCI device | |
1587 | * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTD, 4=INTD) | |
1588 | * | |
1589 | * Perform INTx swizzling for a device behind one level of bridge. This is | |
1590 | * required by section 9.1 of the PCI-to-PCI bridge specification for devices | |
46b952a3 MW |
1591 | * behind bridges on add-in cards. For devices with ARI enabled, the slot |
1592 | * number is always 0 (see the Implementation Note in section 2.2.8.1 of | |
1593 | * the PCI Express Base Specification, Revision 2.1) | |
57c2cf71 BH |
1594 | */ |
1595 | u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin) | |
1596 | { | |
46b952a3 MW |
1597 | int slot; |
1598 | ||
1599 | if (pci_ari_enabled(dev->bus)) | |
1600 | slot = 0; | |
1601 | else | |
1602 | slot = PCI_SLOT(dev->devfn); | |
1603 | ||
1604 | return (((pin - 1) + slot) % 4) + 1; | |
57c2cf71 BH |
1605 | } |
1606 | ||
1da177e4 LT |
1607 | int |
1608 | pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) | |
1609 | { | |
1610 | u8 pin; | |
1611 | ||
514d207d | 1612 | pin = dev->pin; |
1da177e4 LT |
1613 | if (!pin) |
1614 | return -1; | |
878f2e50 | 1615 | |
8784fd4d | 1616 | while (!pci_is_root_bus(dev->bus)) { |
57c2cf71 | 1617 | pin = pci_swizzle_interrupt_pin(dev, pin); |
1da177e4 LT |
1618 | dev = dev->bus->self; |
1619 | } | |
1620 | *bridge = dev; | |
1621 | return pin; | |
1622 | } | |
1623 | ||
68feac87 BH |
1624 | /** |
1625 | * pci_common_swizzle - swizzle INTx all the way to root bridge | |
1626 | * @dev: the PCI device | |
1627 | * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD) | |
1628 | * | |
1629 | * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI | |
1630 | * bridges all the way up to a PCI root bus. | |
1631 | */ | |
1632 | u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp) | |
1633 | { | |
1634 | u8 pin = *pinp; | |
1635 | ||
1eb39487 | 1636 | while (!pci_is_root_bus(dev->bus)) { |
68feac87 BH |
1637 | pin = pci_swizzle_interrupt_pin(dev, pin); |
1638 | dev = dev->bus->self; | |
1639 | } | |
1640 | *pinp = pin; | |
1641 | return PCI_SLOT(dev->devfn); | |
1642 | } | |
1643 | ||
1da177e4 LT |
1644 | /** |
1645 | * pci_release_region - Release a PCI bar | |
1646 | * @pdev: PCI device whose resources were previously reserved by pci_request_region | |
1647 | * @bar: BAR to release | |
1648 | * | |
1649 | * Releases the PCI I/O and memory resources previously reserved by a | |
1650 | * successful call to pci_request_region. Call this function only | |
1651 | * after all use of the PCI regions has ceased. | |
1652 | */ | |
1653 | void pci_release_region(struct pci_dev *pdev, int bar) | |
1654 | { | |
9ac7849e TH |
1655 | struct pci_devres *dr; |
1656 | ||
1da177e4 LT |
1657 | if (pci_resource_len(pdev, bar) == 0) |
1658 | return; | |
1659 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) | |
1660 | release_region(pci_resource_start(pdev, bar), | |
1661 | pci_resource_len(pdev, bar)); | |
1662 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) | |
1663 | release_mem_region(pci_resource_start(pdev, bar), | |
1664 | pci_resource_len(pdev, bar)); | |
9ac7849e TH |
1665 | |
1666 | dr = find_pci_dr(pdev); | |
1667 | if (dr) | |
1668 | dr->region_mask &= ~(1 << bar); | |
1da177e4 LT |
1669 | } |
1670 | ||
1671 | /** | |
f5ddcac4 | 1672 | * __pci_request_region - Reserved PCI I/O and memory resource |
1da177e4 LT |
1673 | * @pdev: PCI device whose resources are to be reserved |
1674 | * @bar: BAR to be reserved | |
1675 | * @res_name: Name to be associated with resource. | |
f5ddcac4 | 1676 | * @exclusive: whether the region access is exclusive or not |
1da177e4 LT |
1677 | * |
1678 | * Mark the PCI region associated with PCI device @pdev BR @bar as | |
1679 | * being reserved by owner @res_name. Do not access any | |
1680 | * address inside the PCI regions unless this call returns | |
1681 | * successfully. | |
1682 | * | |
f5ddcac4 RD |
1683 | * If @exclusive is set, then the region is marked so that userspace |
1684 | * is explicitly not allowed to map the resource via /dev/mem or | |
1685 | * sysfs MMIO access. | |
1686 | * | |
1da177e4 LT |
1687 | * Returns 0 on success, or %EBUSY on error. A warning |
1688 | * message is also printed on failure. | |
1689 | */ | |
e8de1481 AV |
1690 | static int __pci_request_region(struct pci_dev *pdev, int bar, const char *res_name, |
1691 | int exclusive) | |
1da177e4 | 1692 | { |
9ac7849e TH |
1693 | struct pci_devres *dr; |
1694 | ||
1da177e4 LT |
1695 | if (pci_resource_len(pdev, bar) == 0) |
1696 | return 0; | |
1697 | ||
1698 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) { | |
1699 | if (!request_region(pci_resource_start(pdev, bar), | |
1700 | pci_resource_len(pdev, bar), res_name)) | |
1701 | goto err_out; | |
1702 | } | |
1703 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) { | |
e8de1481 AV |
1704 | if (!__request_mem_region(pci_resource_start(pdev, bar), |
1705 | pci_resource_len(pdev, bar), res_name, | |
1706 | exclusive)) | |
1da177e4 LT |
1707 | goto err_out; |
1708 | } | |
9ac7849e TH |
1709 | |
1710 | dr = find_pci_dr(pdev); | |
1711 | if (dr) | |
1712 | dr->region_mask |= 1 << bar; | |
1713 | ||
1da177e4 LT |
1714 | return 0; |
1715 | ||
1716 | err_out: | |
c7dabef8 | 1717 | dev_warn(&pdev->dev, "BAR %d: can't reserve %pR\n", bar, |
096e6f67 | 1718 | &pdev->resource[bar]); |
1da177e4 LT |
1719 | return -EBUSY; |
1720 | } | |
1721 | ||
e8de1481 | 1722 | /** |
f5ddcac4 | 1723 | * pci_request_region - Reserve PCI I/O and memory resource |
e8de1481 AV |
1724 | * @pdev: PCI device whose resources are to be reserved |
1725 | * @bar: BAR to be reserved | |
f5ddcac4 | 1726 | * @res_name: Name to be associated with resource |
e8de1481 | 1727 | * |
f5ddcac4 | 1728 | * Mark the PCI region associated with PCI device @pdev BAR @bar as |
e8de1481 AV |
1729 | * being reserved by owner @res_name. Do not access any |
1730 | * address inside the PCI regions unless this call returns | |
1731 | * successfully. | |
1732 | * | |
1733 | * Returns 0 on success, or %EBUSY on error. A warning | |
1734 | * message is also printed on failure. | |
1735 | */ | |
1736 | int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name) | |
1737 | { | |
1738 | return __pci_request_region(pdev, bar, res_name, 0); | |
1739 | } | |
1740 | ||
1741 | /** | |
1742 | * pci_request_region_exclusive - Reserved PCI I/O and memory resource | |
1743 | * @pdev: PCI device whose resources are to be reserved | |
1744 | * @bar: BAR to be reserved | |
1745 | * @res_name: Name to be associated with resource. | |
1746 | * | |
1747 | * Mark the PCI region associated with PCI device @pdev BR @bar as | |
1748 | * being reserved by owner @res_name. Do not access any | |
1749 | * address inside the PCI regions unless this call returns | |
1750 | * successfully. | |
1751 | * | |
1752 | * Returns 0 on success, or %EBUSY on error. A warning | |
1753 | * message is also printed on failure. | |
1754 | * | |
1755 | * The key difference that _exclusive makes it that userspace is | |
1756 | * explicitly not allowed to map the resource via /dev/mem or | |
1757 | * sysfs. | |
1758 | */ | |
1759 | int pci_request_region_exclusive(struct pci_dev *pdev, int bar, const char *res_name) | |
1760 | { | |
1761 | return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE); | |
1762 | } | |
c87deff7 HS |
1763 | /** |
1764 | * pci_release_selected_regions - Release selected PCI I/O and memory resources | |
1765 | * @pdev: PCI device whose resources were previously reserved | |
1766 | * @bars: Bitmask of BARs to be released | |
1767 | * | |
1768 | * Release selected PCI I/O and memory resources previously reserved. | |
1769 | * Call this function only after all use of the PCI regions has ceased. | |
1770 | */ | |
1771 | void pci_release_selected_regions(struct pci_dev *pdev, int bars) | |
1772 | { | |
1773 | int i; | |
1774 | ||
1775 | for (i = 0; i < 6; i++) | |
1776 | if (bars & (1 << i)) | |
1777 | pci_release_region(pdev, i); | |
1778 | } | |
1779 | ||
e8de1481 AV |
1780 | int __pci_request_selected_regions(struct pci_dev *pdev, int bars, |
1781 | const char *res_name, int excl) | |
c87deff7 HS |
1782 | { |
1783 | int i; | |
1784 | ||
1785 | for (i = 0; i < 6; i++) | |
1786 | if (bars & (1 << i)) | |
e8de1481 | 1787 | if (__pci_request_region(pdev, i, res_name, excl)) |
c87deff7 HS |
1788 | goto err_out; |
1789 | return 0; | |
1790 | ||
1791 | err_out: | |
1792 | while(--i >= 0) | |
1793 | if (bars & (1 << i)) | |
1794 | pci_release_region(pdev, i); | |
1795 | ||
1796 | return -EBUSY; | |
1797 | } | |
1da177e4 | 1798 | |
e8de1481 AV |
1799 | |
1800 | /** | |
1801 | * pci_request_selected_regions - Reserve selected PCI I/O and memory resources | |
1802 | * @pdev: PCI device whose resources are to be reserved | |
1803 | * @bars: Bitmask of BARs to be requested | |
1804 | * @res_name: Name to be associated with resource | |
1805 | */ | |
1806 | int pci_request_selected_regions(struct pci_dev *pdev, int bars, | |
1807 | const char *res_name) | |
1808 | { | |
1809 | return __pci_request_selected_regions(pdev, bars, res_name, 0); | |
1810 | } | |
1811 | ||
1812 | int pci_request_selected_regions_exclusive(struct pci_dev *pdev, | |
1813 | int bars, const char *res_name) | |
1814 | { | |
1815 | return __pci_request_selected_regions(pdev, bars, res_name, | |
1816 | IORESOURCE_EXCLUSIVE); | |
1817 | } | |
1818 | ||
1da177e4 LT |
1819 | /** |
1820 | * pci_release_regions - Release reserved PCI I/O and memory resources | |
1821 | * @pdev: PCI device whose resources were previously reserved by pci_request_regions | |
1822 | * | |
1823 | * Releases all PCI I/O and memory resources previously reserved by a | |
1824 | * successful call to pci_request_regions. Call this function only | |
1825 | * after all use of the PCI regions has ceased. | |
1826 | */ | |
1827 | ||
1828 | void pci_release_regions(struct pci_dev *pdev) | |
1829 | { | |
c87deff7 | 1830 | pci_release_selected_regions(pdev, (1 << 6) - 1); |
1da177e4 LT |
1831 | } |
1832 | ||
1833 | /** | |
1834 | * pci_request_regions - Reserved PCI I/O and memory resources | |
1835 | * @pdev: PCI device whose resources are to be reserved | |
1836 | * @res_name: Name to be associated with resource. | |
1837 | * | |
1838 | * Mark all PCI regions associated with PCI device @pdev as | |
1839 | * being reserved by owner @res_name. Do not access any | |
1840 | * address inside the PCI regions unless this call returns | |
1841 | * successfully. | |
1842 | * | |
1843 | * Returns 0 on success, or %EBUSY on error. A warning | |
1844 | * message is also printed on failure. | |
1845 | */ | |
3c990e92 | 1846 | int pci_request_regions(struct pci_dev *pdev, const char *res_name) |
1da177e4 | 1847 | { |
c87deff7 | 1848 | return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); |
1da177e4 LT |
1849 | } |
1850 | ||
e8de1481 AV |
1851 | /** |
1852 | * pci_request_regions_exclusive - Reserved PCI I/O and memory resources | |
1853 | * @pdev: PCI device whose resources are to be reserved | |
1854 | * @res_name: Name to be associated with resource. | |
1855 | * | |
1856 | * Mark all PCI regions associated with PCI device @pdev as | |
1857 | * being reserved by owner @res_name. Do not access any | |
1858 | * address inside the PCI regions unless this call returns | |
1859 | * successfully. | |
1860 | * | |
1861 | * pci_request_regions_exclusive() will mark the region so that | |
1862 | * /dev/mem and the sysfs MMIO access will not be allowed. | |
1863 | * | |
1864 | * Returns 0 on success, or %EBUSY on error. A warning | |
1865 | * message is also printed on failure. | |
1866 | */ | |
1867 | int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) | |
1868 | { | |
1869 | return pci_request_selected_regions_exclusive(pdev, | |
1870 | ((1 << 6) - 1), res_name); | |
1871 | } | |
1872 | ||
6a479079 BH |
1873 | static void __pci_set_master(struct pci_dev *dev, bool enable) |
1874 | { | |
1875 | u16 old_cmd, cmd; | |
1876 | ||
1877 | pci_read_config_word(dev, PCI_COMMAND, &old_cmd); | |
1878 | if (enable) | |
1879 | cmd = old_cmd | PCI_COMMAND_MASTER; | |
1880 | else | |
1881 | cmd = old_cmd & ~PCI_COMMAND_MASTER; | |
1882 | if (cmd != old_cmd) { | |
1883 | dev_dbg(&dev->dev, "%s bus mastering\n", | |
1884 | enable ? "enabling" : "disabling"); | |
1885 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
1886 | } | |
1887 | dev->is_busmaster = enable; | |
1888 | } | |
e8de1481 | 1889 | |
1da177e4 LT |
1890 | /** |
1891 | * pci_set_master - enables bus-mastering for device dev | |
1892 | * @dev: the PCI device to enable | |
1893 | * | |
1894 | * Enables bus-mastering on the device and calls pcibios_set_master() | |
1895 | * to do the needed arch specific settings. | |
1896 | */ | |
6a479079 | 1897 | void pci_set_master(struct pci_dev *dev) |
1da177e4 | 1898 | { |
6a479079 | 1899 | __pci_set_master(dev, true); |
1da177e4 LT |
1900 | pcibios_set_master(dev); |
1901 | } | |
1902 | ||
6a479079 BH |
1903 | /** |
1904 | * pci_clear_master - disables bus-mastering for device dev | |
1905 | * @dev: the PCI device to disable | |
1906 | */ | |
1907 | void pci_clear_master(struct pci_dev *dev) | |
1908 | { | |
1909 | __pci_set_master(dev, false); | |
1910 | } | |
1911 | ||
1da177e4 | 1912 | /** |
edb2d97e MW |
1913 | * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed |
1914 | * @dev: the PCI device for which MWI is to be enabled | |
1da177e4 | 1915 | * |
edb2d97e MW |
1916 | * Helper function for pci_set_mwi. |
1917 | * Originally copied from drivers/net/acenic.c. | |
1da177e4 LT |
1918 | * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>. |
1919 | * | |
1920 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1921 | */ | |
15ea76d4 | 1922 | int pci_set_cacheline_size(struct pci_dev *dev) |
1da177e4 LT |
1923 | { |
1924 | u8 cacheline_size; | |
1925 | ||
1926 | if (!pci_cache_line_size) | |
15ea76d4 | 1927 | return -EINVAL; |
1da177e4 LT |
1928 | |
1929 | /* Validate current setting: the PCI_CACHE_LINE_SIZE must be | |
1930 | equal to or multiple of the right value. */ | |
1931 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); | |
1932 | if (cacheline_size >= pci_cache_line_size && | |
1933 | (cacheline_size % pci_cache_line_size) == 0) | |
1934 | return 0; | |
1935 | ||
1936 | /* Write the correct value. */ | |
1937 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size); | |
1938 | /* Read it back. */ | |
1939 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); | |
1940 | if (cacheline_size == pci_cache_line_size) | |
1941 | return 0; | |
1942 | ||
80ccba11 BH |
1943 | dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not " |
1944 | "supported\n", pci_cache_line_size << 2); | |
1da177e4 LT |
1945 | |
1946 | return -EINVAL; | |
1947 | } | |
15ea76d4 TH |
1948 | EXPORT_SYMBOL_GPL(pci_set_cacheline_size); |
1949 | ||
1950 | #ifdef PCI_DISABLE_MWI | |
1951 | int pci_set_mwi(struct pci_dev *dev) | |
1952 | { | |
1953 | return 0; | |
1954 | } | |
1955 | ||
1956 | int pci_try_set_mwi(struct pci_dev *dev) | |
1957 | { | |
1958 | return 0; | |
1959 | } | |
1960 | ||
1961 | void pci_clear_mwi(struct pci_dev *dev) | |
1962 | { | |
1963 | } | |
1964 | ||
1965 | #else | |
1da177e4 LT |
1966 | |
1967 | /** | |
1968 | * pci_set_mwi - enables memory-write-invalidate PCI transaction | |
1969 | * @dev: the PCI device for which MWI is enabled | |
1970 | * | |
694625c0 | 1971 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. |
1da177e4 LT |
1972 | * |
1973 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1974 | */ | |
1975 | int | |
1976 | pci_set_mwi(struct pci_dev *dev) | |
1977 | { | |
1978 | int rc; | |
1979 | u16 cmd; | |
1980 | ||
edb2d97e | 1981 | rc = pci_set_cacheline_size(dev); |
1da177e4 LT |
1982 | if (rc) |
1983 | return rc; | |
1984 | ||
1985 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
1986 | if (! (cmd & PCI_COMMAND_INVALIDATE)) { | |
80ccba11 | 1987 | dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n"); |
1da177e4 LT |
1988 | cmd |= PCI_COMMAND_INVALIDATE; |
1989 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
1990 | } | |
1991 | ||
1992 | return 0; | |
1993 | } | |
1994 | ||
694625c0 RD |
1995 | /** |
1996 | * pci_try_set_mwi - enables memory-write-invalidate PCI transaction | |
1997 | * @dev: the PCI device for which MWI is enabled | |
1998 | * | |
1999 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. | |
2000 | * Callers are not required to check the return value. | |
2001 | * | |
2002 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2003 | */ | |
2004 | int pci_try_set_mwi(struct pci_dev *dev) | |
2005 | { | |
2006 | int rc = pci_set_mwi(dev); | |
2007 | return rc; | |
2008 | } | |
2009 | ||
1da177e4 LT |
2010 | /** |
2011 | * pci_clear_mwi - disables Memory-Write-Invalidate for device dev | |
2012 | * @dev: the PCI device to disable | |
2013 | * | |
2014 | * Disables PCI Memory-Write-Invalidate transaction on the device | |
2015 | */ | |
2016 | void | |
2017 | pci_clear_mwi(struct pci_dev *dev) | |
2018 | { | |
2019 | u16 cmd; | |
2020 | ||
2021 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
2022 | if (cmd & PCI_COMMAND_INVALIDATE) { | |
2023 | cmd &= ~PCI_COMMAND_INVALIDATE; | |
2024 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
2025 | } | |
2026 | } | |
edb2d97e | 2027 | #endif /* ! PCI_DISABLE_MWI */ |
1da177e4 | 2028 | |
a04ce0ff BR |
2029 | /** |
2030 | * pci_intx - enables/disables PCI INTx for device dev | |
8f7020d3 RD |
2031 | * @pdev: the PCI device to operate on |
2032 | * @enable: boolean: whether to enable or disable PCI INTx | |
a04ce0ff BR |
2033 | * |
2034 | * Enables/disables PCI INTx for device dev | |
2035 | */ | |
2036 | void | |
2037 | pci_intx(struct pci_dev *pdev, int enable) | |
2038 | { | |
2039 | u16 pci_command, new; | |
2040 | ||
2041 | pci_read_config_word(pdev, PCI_COMMAND, &pci_command); | |
2042 | ||
2043 | if (enable) { | |
2044 | new = pci_command & ~PCI_COMMAND_INTX_DISABLE; | |
2045 | } else { | |
2046 | new = pci_command | PCI_COMMAND_INTX_DISABLE; | |
2047 | } | |
2048 | ||
2049 | if (new != pci_command) { | |
9ac7849e TH |
2050 | struct pci_devres *dr; |
2051 | ||
2fd9d74b | 2052 | pci_write_config_word(pdev, PCI_COMMAND, new); |
9ac7849e TH |
2053 | |
2054 | dr = find_pci_dr(pdev); | |
2055 | if (dr && !dr->restore_intx) { | |
2056 | dr->restore_intx = 1; | |
2057 | dr->orig_intx = !enable; | |
2058 | } | |
a04ce0ff BR |
2059 | } |
2060 | } | |
2061 | ||
f5f2b131 EB |
2062 | /** |
2063 | * pci_msi_off - disables any msi or msix capabilities | |
8d7d86e9 | 2064 | * @dev: the PCI device to operate on |
f5f2b131 EB |
2065 | * |
2066 | * If you want to use msi see pci_enable_msi and friends. | |
2067 | * This is a lower level primitive that allows us to disable | |
2068 | * msi operation at the device level. | |
2069 | */ | |
2070 | void pci_msi_off(struct pci_dev *dev) | |
2071 | { | |
2072 | int pos; | |
2073 | u16 control; | |
2074 | ||
2075 | pos = pci_find_capability(dev, PCI_CAP_ID_MSI); | |
2076 | if (pos) { | |
2077 | pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control); | |
2078 | control &= ~PCI_MSI_FLAGS_ENABLE; | |
2079 | pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control); | |
2080 | } | |
2081 | pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); | |
2082 | if (pos) { | |
2083 | pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); | |
2084 | control &= ~PCI_MSIX_FLAGS_ENABLE; | |
2085 | pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); | |
2086 | } | |
2087 | } | |
2088 | ||
1da177e4 LT |
2089 | #ifndef HAVE_ARCH_PCI_SET_DMA_MASK |
2090 | /* | |
2091 | * These can be overridden by arch-specific implementations | |
2092 | */ | |
2093 | int | |
2094 | pci_set_dma_mask(struct pci_dev *dev, u64 mask) | |
2095 | { | |
2096 | if (!pci_dma_supported(dev, mask)) | |
2097 | return -EIO; | |
2098 | ||
2099 | dev->dma_mask = mask; | |
2100 | ||
2101 | return 0; | |
2102 | } | |
2103 | ||
1da177e4 LT |
2104 | int |
2105 | pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask) | |
2106 | { | |
2107 | if (!pci_dma_supported(dev, mask)) | |
2108 | return -EIO; | |
2109 | ||
2110 | dev->dev.coherent_dma_mask = mask; | |
2111 | ||
2112 | return 0; | |
2113 | } | |
2114 | #endif | |
c87deff7 | 2115 | |
4d57cdfa FT |
2116 | #ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE |
2117 | int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size) | |
2118 | { | |
2119 | return dma_set_max_seg_size(&dev->dev, size); | |
2120 | } | |
2121 | EXPORT_SYMBOL(pci_set_dma_max_seg_size); | |
2122 | #endif | |
2123 | ||
59fc67de FT |
2124 | #ifndef HAVE_ARCH_PCI_SET_DMA_SEGMENT_BOUNDARY |
2125 | int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask) | |
2126 | { | |
2127 | return dma_set_seg_boundary(&dev->dev, mask); | |
2128 | } | |
2129 | EXPORT_SYMBOL(pci_set_dma_seg_boundary); | |
2130 | #endif | |
2131 | ||
8c1c699f | 2132 | static int pcie_flr(struct pci_dev *dev, int probe) |
8dd7f803 | 2133 | { |
8c1c699f YZ |
2134 | int i; |
2135 | int pos; | |
8dd7f803 | 2136 | u32 cap; |
8c1c699f | 2137 | u16 status; |
8dd7f803 | 2138 | |
8c1c699f YZ |
2139 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); |
2140 | if (!pos) | |
8dd7f803 | 2141 | return -ENOTTY; |
8c1c699f YZ |
2142 | |
2143 | pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP, &cap); | |
8dd7f803 SY |
2144 | if (!(cap & PCI_EXP_DEVCAP_FLR)) |
2145 | return -ENOTTY; | |
2146 | ||
d91cdc74 SY |
2147 | if (probe) |
2148 | return 0; | |
2149 | ||
8dd7f803 | 2150 | /* Wait for Transaction Pending bit clean */ |
8c1c699f YZ |
2151 | for (i = 0; i < 4; i++) { |
2152 | if (i) | |
2153 | msleep((1 << (i - 1)) * 100); | |
5fe5db05 | 2154 | |
8c1c699f YZ |
2155 | pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &status); |
2156 | if (!(status & PCI_EXP_DEVSTA_TRPND)) | |
2157 | goto clear; | |
2158 | } | |
2159 | ||
2160 | dev_err(&dev->dev, "transaction is not cleared; " | |
2161 | "proceeding with reset anyway\n"); | |
2162 | ||
2163 | clear: | |
2164 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, | |
8dd7f803 | 2165 | PCI_EXP_DEVCTL_BCR_FLR); |
8c1c699f | 2166 | msleep(100); |
8dd7f803 | 2167 | |
8dd7f803 SY |
2168 | return 0; |
2169 | } | |
d91cdc74 | 2170 | |
8c1c699f | 2171 | static int pci_af_flr(struct pci_dev *dev, int probe) |
1ca88797 | 2172 | { |
8c1c699f YZ |
2173 | int i; |
2174 | int pos; | |
1ca88797 | 2175 | u8 cap; |
8c1c699f | 2176 | u8 status; |
1ca88797 | 2177 | |
8c1c699f YZ |
2178 | pos = pci_find_capability(dev, PCI_CAP_ID_AF); |
2179 | if (!pos) | |
1ca88797 | 2180 | return -ENOTTY; |
8c1c699f YZ |
2181 | |
2182 | pci_read_config_byte(dev, pos + PCI_AF_CAP, &cap); | |
1ca88797 SY |
2183 | if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR)) |
2184 | return -ENOTTY; | |
2185 | ||
2186 | if (probe) | |
2187 | return 0; | |
2188 | ||
1ca88797 | 2189 | /* Wait for Transaction Pending bit clean */ |
8c1c699f YZ |
2190 | for (i = 0; i < 4; i++) { |
2191 | if (i) | |
2192 | msleep((1 << (i - 1)) * 100); | |
2193 | ||
2194 | pci_read_config_byte(dev, pos + PCI_AF_STATUS, &status); | |
2195 | if (!(status & PCI_AF_STATUS_TP)) | |
2196 | goto clear; | |
2197 | } | |
5fe5db05 | 2198 | |
8c1c699f YZ |
2199 | dev_err(&dev->dev, "transaction is not cleared; " |
2200 | "proceeding with reset anyway\n"); | |
5fe5db05 | 2201 | |
8c1c699f YZ |
2202 | clear: |
2203 | pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR); | |
1ca88797 | 2204 | msleep(100); |
8c1c699f | 2205 | |
1ca88797 SY |
2206 | return 0; |
2207 | } | |
2208 | ||
f85876ba | 2209 | static int pci_pm_reset(struct pci_dev *dev, int probe) |
d91cdc74 | 2210 | { |
f85876ba YZ |
2211 | u16 csr; |
2212 | ||
2213 | if (!dev->pm_cap) | |
2214 | return -ENOTTY; | |
d91cdc74 | 2215 | |
f85876ba YZ |
2216 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &csr); |
2217 | if (csr & PCI_PM_CTRL_NO_SOFT_RESET) | |
2218 | return -ENOTTY; | |
d91cdc74 | 2219 | |
f85876ba YZ |
2220 | if (probe) |
2221 | return 0; | |
1ca88797 | 2222 | |
f85876ba YZ |
2223 | if (dev->current_state != PCI_D0) |
2224 | return -EINVAL; | |
2225 | ||
2226 | csr &= ~PCI_PM_CTRL_STATE_MASK; | |
2227 | csr |= PCI_D3hot; | |
2228 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr); | |
2229 | msleep(pci_pm_d3_delay); | |
2230 | ||
2231 | csr &= ~PCI_PM_CTRL_STATE_MASK; | |
2232 | csr |= PCI_D0; | |
2233 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr); | |
2234 | msleep(pci_pm_d3_delay); | |
2235 | ||
2236 | return 0; | |
2237 | } | |
2238 | ||
c12ff1df YZ |
2239 | static int pci_parent_bus_reset(struct pci_dev *dev, int probe) |
2240 | { | |
2241 | u16 ctrl; | |
2242 | struct pci_dev *pdev; | |
2243 | ||
654b75e0 | 2244 | if (pci_is_root_bus(dev->bus) || dev->subordinate || !dev->bus->self) |
c12ff1df YZ |
2245 | return -ENOTTY; |
2246 | ||
2247 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
2248 | if (pdev != dev) | |
2249 | return -ENOTTY; | |
2250 | ||
2251 | if (probe) | |
2252 | return 0; | |
2253 | ||
2254 | pci_read_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, &ctrl); | |
2255 | ctrl |= PCI_BRIDGE_CTL_BUS_RESET; | |
2256 | pci_write_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, ctrl); | |
2257 | msleep(100); | |
2258 | ||
2259 | ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET; | |
2260 | pci_write_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, ctrl); | |
2261 | msleep(100); | |
2262 | ||
2263 | return 0; | |
2264 | } | |
2265 | ||
8c1c699f | 2266 | static int pci_dev_reset(struct pci_dev *dev, int probe) |
d91cdc74 | 2267 | { |
8c1c699f YZ |
2268 | int rc; |
2269 | ||
2270 | might_sleep(); | |
2271 | ||
2272 | if (!probe) { | |
2273 | pci_block_user_cfg_access(dev); | |
2274 | /* block PM suspend, driver probe, etc. */ | |
2275 | down(&dev->dev.sem); | |
2276 | } | |
d91cdc74 | 2277 | |
8c1c699f YZ |
2278 | rc = pcie_flr(dev, probe); |
2279 | if (rc != -ENOTTY) | |
2280 | goto done; | |
d91cdc74 | 2281 | |
8c1c699f | 2282 | rc = pci_af_flr(dev, probe); |
f85876ba YZ |
2283 | if (rc != -ENOTTY) |
2284 | goto done; | |
2285 | ||
2286 | rc = pci_pm_reset(dev, probe); | |
c12ff1df YZ |
2287 | if (rc != -ENOTTY) |
2288 | goto done; | |
2289 | ||
2290 | rc = pci_parent_bus_reset(dev, probe); | |
8c1c699f YZ |
2291 | done: |
2292 | if (!probe) { | |
2293 | up(&dev->dev.sem); | |
2294 | pci_unblock_user_cfg_access(dev); | |
2295 | } | |
1ca88797 | 2296 | |
8c1c699f | 2297 | return rc; |
d91cdc74 SY |
2298 | } |
2299 | ||
2300 | /** | |
8c1c699f YZ |
2301 | * __pci_reset_function - reset a PCI device function |
2302 | * @dev: PCI device to reset | |
d91cdc74 SY |
2303 | * |
2304 | * Some devices allow an individual function to be reset without affecting | |
2305 | * other functions in the same device. The PCI device must be responsive | |
2306 | * to PCI config space in order to use this function. | |
2307 | * | |
2308 | * The device function is presumed to be unused when this function is called. | |
2309 | * Resetting the device will make the contents of PCI configuration space | |
2310 | * random, so any caller of this must be prepared to reinitialise the | |
2311 | * device including MSI, bus mastering, BARs, decoding IO and memory spaces, | |
2312 | * etc. | |
2313 | * | |
8c1c699f | 2314 | * Returns 0 if the device function was successfully reset or negative if the |
d91cdc74 SY |
2315 | * device doesn't support resetting a single function. |
2316 | */ | |
8c1c699f | 2317 | int __pci_reset_function(struct pci_dev *dev) |
d91cdc74 | 2318 | { |
8c1c699f | 2319 | return pci_dev_reset(dev, 0); |
d91cdc74 | 2320 | } |
8c1c699f | 2321 | EXPORT_SYMBOL_GPL(__pci_reset_function); |
8dd7f803 | 2322 | |
711d5779 MT |
2323 | /** |
2324 | * pci_probe_reset_function - check whether the device can be safely reset | |
2325 | * @dev: PCI device to reset | |
2326 | * | |
2327 | * Some devices allow an individual function to be reset without affecting | |
2328 | * other functions in the same device. The PCI device must be responsive | |
2329 | * to PCI config space in order to use this function. | |
2330 | * | |
2331 | * Returns 0 if the device function can be reset or negative if the | |
2332 | * device doesn't support resetting a single function. | |
2333 | */ | |
2334 | int pci_probe_reset_function(struct pci_dev *dev) | |
2335 | { | |
2336 | return pci_dev_reset(dev, 1); | |
2337 | } | |
2338 | ||
8dd7f803 | 2339 | /** |
8c1c699f YZ |
2340 | * pci_reset_function - quiesce and reset a PCI device function |
2341 | * @dev: PCI device to reset | |
8dd7f803 SY |
2342 | * |
2343 | * Some devices allow an individual function to be reset without affecting | |
2344 | * other functions in the same device. The PCI device must be responsive | |
2345 | * to PCI config space in order to use this function. | |
2346 | * | |
2347 | * This function does not just reset the PCI portion of a device, but | |
2348 | * clears all the state associated with the device. This function differs | |
8c1c699f | 2349 | * from __pci_reset_function in that it saves and restores device state |
8dd7f803 SY |
2350 | * over the reset. |
2351 | * | |
8c1c699f | 2352 | * Returns 0 if the device function was successfully reset or negative if the |
8dd7f803 SY |
2353 | * device doesn't support resetting a single function. |
2354 | */ | |
2355 | int pci_reset_function(struct pci_dev *dev) | |
2356 | { | |
8c1c699f | 2357 | int rc; |
8dd7f803 | 2358 | |
8c1c699f YZ |
2359 | rc = pci_dev_reset(dev, 1); |
2360 | if (rc) | |
2361 | return rc; | |
8dd7f803 | 2362 | |
8dd7f803 SY |
2363 | pci_save_state(dev); |
2364 | ||
8c1c699f YZ |
2365 | /* |
2366 | * both INTx and MSI are disabled after the Interrupt Disable bit | |
2367 | * is set and the Bus Master bit is cleared. | |
2368 | */ | |
8dd7f803 SY |
2369 | pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); |
2370 | ||
8c1c699f | 2371 | rc = pci_dev_reset(dev, 0); |
8dd7f803 SY |
2372 | |
2373 | pci_restore_state(dev); | |
8dd7f803 | 2374 | |
8c1c699f | 2375 | return rc; |
8dd7f803 SY |
2376 | } |
2377 | EXPORT_SYMBOL_GPL(pci_reset_function); | |
2378 | ||
d556ad4b PO |
2379 | /** |
2380 | * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count | |
2381 | * @dev: PCI device to query | |
2382 | * | |
2383 | * Returns mmrbc: maximum designed memory read count in bytes | |
2384 | * or appropriate error value. | |
2385 | */ | |
2386 | int pcix_get_max_mmrbc(struct pci_dev *dev) | |
2387 | { | |
b7b095c1 | 2388 | int err, cap; |
d556ad4b PO |
2389 | u32 stat; |
2390 | ||
2391 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
2392 | if (!cap) | |
2393 | return -EINVAL; | |
2394 | ||
2395 | err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat); | |
2396 | if (err) | |
2397 | return -EINVAL; | |
2398 | ||
b7b095c1 | 2399 | return (stat & PCI_X_STATUS_MAX_READ) >> 12; |
d556ad4b PO |
2400 | } |
2401 | EXPORT_SYMBOL(pcix_get_max_mmrbc); | |
2402 | ||
2403 | /** | |
2404 | * pcix_get_mmrbc - get PCI-X maximum memory read byte count | |
2405 | * @dev: PCI device to query | |
2406 | * | |
2407 | * Returns mmrbc: maximum memory read count in bytes | |
2408 | * or appropriate error value. | |
2409 | */ | |
2410 | int pcix_get_mmrbc(struct pci_dev *dev) | |
2411 | { | |
2412 | int ret, cap; | |
2413 | u32 cmd; | |
2414 | ||
2415 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
2416 | if (!cap) | |
2417 | return -EINVAL; | |
2418 | ||
2419 | ret = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd); | |
2420 | if (!ret) | |
2421 | ret = 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2); | |
2422 | ||
2423 | return ret; | |
2424 | } | |
2425 | EXPORT_SYMBOL(pcix_get_mmrbc); | |
2426 | ||
2427 | /** | |
2428 | * pcix_set_mmrbc - set PCI-X maximum memory read byte count | |
2429 | * @dev: PCI device to query | |
2430 | * @mmrbc: maximum memory read count in bytes | |
2431 | * valid values are 512, 1024, 2048, 4096 | |
2432 | * | |
2433 | * If possible sets maximum memory read byte count, some bridges have erratas | |
2434 | * that prevent this. | |
2435 | */ | |
2436 | int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc) | |
2437 | { | |
2438 | int cap, err = -EINVAL; | |
2439 | u32 stat, cmd, v, o; | |
2440 | ||
229f5afd | 2441 | if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc)) |
d556ad4b PO |
2442 | goto out; |
2443 | ||
2444 | v = ffs(mmrbc) - 10; | |
2445 | ||
2446 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
2447 | if (!cap) | |
2448 | goto out; | |
2449 | ||
2450 | err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat); | |
2451 | if (err) | |
2452 | goto out; | |
2453 | ||
2454 | if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21) | |
2455 | return -E2BIG; | |
2456 | ||
2457 | err = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd); | |
2458 | if (err) | |
2459 | goto out; | |
2460 | ||
2461 | o = (cmd & PCI_X_CMD_MAX_READ) >> 2; | |
2462 | if (o != v) { | |
2463 | if (v > o && dev->bus && | |
2464 | (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC)) | |
2465 | return -EIO; | |
2466 | ||
2467 | cmd &= ~PCI_X_CMD_MAX_READ; | |
2468 | cmd |= v << 2; | |
2469 | err = pci_write_config_dword(dev, cap + PCI_X_CMD, cmd); | |
2470 | } | |
2471 | out: | |
2472 | return err; | |
2473 | } | |
2474 | EXPORT_SYMBOL(pcix_set_mmrbc); | |
2475 | ||
2476 | /** | |
2477 | * pcie_get_readrq - get PCI Express read request size | |
2478 | * @dev: PCI device to query | |
2479 | * | |
2480 | * Returns maximum memory read request in bytes | |
2481 | * or appropriate error value. | |
2482 | */ | |
2483 | int pcie_get_readrq(struct pci_dev *dev) | |
2484 | { | |
2485 | int ret, cap; | |
2486 | u16 ctl; | |
2487 | ||
2488 | cap = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
2489 | if (!cap) | |
2490 | return -EINVAL; | |
2491 | ||
2492 | ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); | |
2493 | if (!ret) | |
2494 | ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12); | |
2495 | ||
2496 | return ret; | |
2497 | } | |
2498 | EXPORT_SYMBOL(pcie_get_readrq); | |
2499 | ||
2500 | /** | |
2501 | * pcie_set_readrq - set PCI Express maximum memory read request | |
2502 | * @dev: PCI device to query | |
42e61f4a | 2503 | * @rq: maximum memory read count in bytes |
d556ad4b PO |
2504 | * valid values are 128, 256, 512, 1024, 2048, 4096 |
2505 | * | |
2506 | * If possible sets maximum read byte count | |
2507 | */ | |
2508 | int pcie_set_readrq(struct pci_dev *dev, int rq) | |
2509 | { | |
2510 | int cap, err = -EINVAL; | |
2511 | u16 ctl, v; | |
2512 | ||
229f5afd | 2513 | if (rq < 128 || rq > 4096 || !is_power_of_2(rq)) |
d556ad4b PO |
2514 | goto out; |
2515 | ||
2516 | v = (ffs(rq) - 8) << 12; | |
2517 | ||
2518 | cap = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
2519 | if (!cap) | |
2520 | goto out; | |
2521 | ||
2522 | err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); | |
2523 | if (err) | |
2524 | goto out; | |
2525 | ||
2526 | if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) { | |
2527 | ctl &= ~PCI_EXP_DEVCTL_READRQ; | |
2528 | ctl |= v; | |
2529 | err = pci_write_config_dword(dev, cap + PCI_EXP_DEVCTL, ctl); | |
2530 | } | |
2531 | ||
2532 | out: | |
2533 | return err; | |
2534 | } | |
2535 | EXPORT_SYMBOL(pcie_set_readrq); | |
2536 | ||
c87deff7 HS |
2537 | /** |
2538 | * pci_select_bars - Make BAR mask from the type of resource | |
f95d882d | 2539 | * @dev: the PCI device for which BAR mask is made |
c87deff7 HS |
2540 | * @flags: resource type mask to be selected |
2541 | * | |
2542 | * This helper routine makes bar mask from the type of resource. | |
2543 | */ | |
2544 | int pci_select_bars(struct pci_dev *dev, unsigned long flags) | |
2545 | { | |
2546 | int i, bars = 0; | |
2547 | for (i = 0; i < PCI_NUM_RESOURCES; i++) | |
2548 | if (pci_resource_flags(dev, i) & flags) | |
2549 | bars |= (1 << i); | |
2550 | return bars; | |
2551 | } | |
2552 | ||
613e7ed6 YZ |
2553 | /** |
2554 | * pci_resource_bar - get position of the BAR associated with a resource | |
2555 | * @dev: the PCI device | |
2556 | * @resno: the resource number | |
2557 | * @type: the BAR type to be filled in | |
2558 | * | |
2559 | * Returns BAR position in config space, or 0 if the BAR is invalid. | |
2560 | */ | |
2561 | int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type) | |
2562 | { | |
d1b054da YZ |
2563 | int reg; |
2564 | ||
613e7ed6 YZ |
2565 | if (resno < PCI_ROM_RESOURCE) { |
2566 | *type = pci_bar_unknown; | |
2567 | return PCI_BASE_ADDRESS_0 + 4 * resno; | |
2568 | } else if (resno == PCI_ROM_RESOURCE) { | |
2569 | *type = pci_bar_mem32; | |
2570 | return dev->rom_base_reg; | |
d1b054da YZ |
2571 | } else if (resno < PCI_BRIDGE_RESOURCES) { |
2572 | /* device specific resource */ | |
2573 | reg = pci_iov_resource_bar(dev, resno, type); | |
2574 | if (reg) | |
2575 | return reg; | |
613e7ed6 YZ |
2576 | } |
2577 | ||
2578 | dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno); | |
2579 | return 0; | |
2580 | } | |
2581 | ||
deb2d2ec BH |
2582 | /** |
2583 | * pci_set_vga_state - set VGA decode state on device and parents if requested | |
19eea630 RD |
2584 | * @dev: the PCI device |
2585 | * @decode: true = enable decoding, false = disable decoding | |
2586 | * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY | |
2587 | * @change_bridge: traverse ancestors and change bridges | |
deb2d2ec BH |
2588 | */ |
2589 | int pci_set_vga_state(struct pci_dev *dev, bool decode, | |
2590 | unsigned int command_bits, bool change_bridge) | |
2591 | { | |
2592 | struct pci_bus *bus; | |
2593 | struct pci_dev *bridge; | |
2594 | u16 cmd; | |
2595 | ||
2596 | WARN_ON(command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY)); | |
2597 | ||
2598 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
2599 | if (decode == true) | |
2600 | cmd |= command_bits; | |
2601 | else | |
2602 | cmd &= ~command_bits; | |
2603 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
2604 | ||
2605 | if (change_bridge == false) | |
2606 | return 0; | |
2607 | ||
2608 | bus = dev->bus; | |
2609 | while (bus) { | |
2610 | bridge = bus->self; | |
2611 | if (bridge) { | |
2612 | pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, | |
2613 | &cmd); | |
2614 | if (decode == true) | |
2615 | cmd |= PCI_BRIDGE_CTL_VGA; | |
2616 | else | |
2617 | cmd &= ~PCI_BRIDGE_CTL_VGA; | |
2618 | pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, | |
2619 | cmd); | |
2620 | } | |
2621 | bus = bus->parent; | |
2622 | } | |
2623 | return 0; | |
2624 | } | |
2625 | ||
32a9a682 YS |
2626 | #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE |
2627 | static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0}; | |
2628 | spinlock_t resource_alignment_lock = SPIN_LOCK_UNLOCKED; | |
2629 | ||
2630 | /** | |
2631 | * pci_specified_resource_alignment - get resource alignment specified by user. | |
2632 | * @dev: the PCI device to get | |
2633 | * | |
2634 | * RETURNS: Resource alignment if it is specified. | |
2635 | * Zero if it is not specified. | |
2636 | */ | |
2637 | resource_size_t pci_specified_resource_alignment(struct pci_dev *dev) | |
2638 | { | |
2639 | int seg, bus, slot, func, align_order, count; | |
2640 | resource_size_t align = 0; | |
2641 | char *p; | |
2642 | ||
2643 | spin_lock(&resource_alignment_lock); | |
2644 | p = resource_alignment_param; | |
2645 | while (*p) { | |
2646 | count = 0; | |
2647 | if (sscanf(p, "%d%n", &align_order, &count) == 1 && | |
2648 | p[count] == '@') { | |
2649 | p += count + 1; | |
2650 | } else { | |
2651 | align_order = -1; | |
2652 | } | |
2653 | if (sscanf(p, "%x:%x:%x.%x%n", | |
2654 | &seg, &bus, &slot, &func, &count) != 4) { | |
2655 | seg = 0; | |
2656 | if (sscanf(p, "%x:%x.%x%n", | |
2657 | &bus, &slot, &func, &count) != 3) { | |
2658 | /* Invalid format */ | |
2659 | printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n", | |
2660 | p); | |
2661 | break; | |
2662 | } | |
2663 | } | |
2664 | p += count; | |
2665 | if (seg == pci_domain_nr(dev->bus) && | |
2666 | bus == dev->bus->number && | |
2667 | slot == PCI_SLOT(dev->devfn) && | |
2668 | func == PCI_FUNC(dev->devfn)) { | |
2669 | if (align_order == -1) { | |
2670 | align = PAGE_SIZE; | |
2671 | } else { | |
2672 | align = 1 << align_order; | |
2673 | } | |
2674 | /* Found */ | |
2675 | break; | |
2676 | } | |
2677 | if (*p != ';' && *p != ',') { | |
2678 | /* End of param or invalid format */ | |
2679 | break; | |
2680 | } | |
2681 | p++; | |
2682 | } | |
2683 | spin_unlock(&resource_alignment_lock); | |
2684 | return align; | |
2685 | } | |
2686 | ||
2687 | /** | |
2688 | * pci_is_reassigndev - check if specified PCI is target device to reassign | |
2689 | * @dev: the PCI device to check | |
2690 | * | |
2691 | * RETURNS: non-zero for PCI device is a target device to reassign, | |
2692 | * or zero is not. | |
2693 | */ | |
2694 | int pci_is_reassigndev(struct pci_dev *dev) | |
2695 | { | |
2696 | return (pci_specified_resource_alignment(dev) != 0); | |
2697 | } | |
2698 | ||
2699 | ssize_t pci_set_resource_alignment_param(const char *buf, size_t count) | |
2700 | { | |
2701 | if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1) | |
2702 | count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1; | |
2703 | spin_lock(&resource_alignment_lock); | |
2704 | strncpy(resource_alignment_param, buf, count); | |
2705 | resource_alignment_param[count] = '\0'; | |
2706 | spin_unlock(&resource_alignment_lock); | |
2707 | return count; | |
2708 | } | |
2709 | ||
2710 | ssize_t pci_get_resource_alignment_param(char *buf, size_t size) | |
2711 | { | |
2712 | size_t count; | |
2713 | spin_lock(&resource_alignment_lock); | |
2714 | count = snprintf(buf, size, "%s", resource_alignment_param); | |
2715 | spin_unlock(&resource_alignment_lock); | |
2716 | return count; | |
2717 | } | |
2718 | ||
2719 | static ssize_t pci_resource_alignment_show(struct bus_type *bus, char *buf) | |
2720 | { | |
2721 | return pci_get_resource_alignment_param(buf, PAGE_SIZE); | |
2722 | } | |
2723 | ||
2724 | static ssize_t pci_resource_alignment_store(struct bus_type *bus, | |
2725 | const char *buf, size_t count) | |
2726 | { | |
2727 | return pci_set_resource_alignment_param(buf, count); | |
2728 | } | |
2729 | ||
2730 | BUS_ATTR(resource_alignment, 0644, pci_resource_alignment_show, | |
2731 | pci_resource_alignment_store); | |
2732 | ||
2733 | static int __init pci_resource_alignment_sysfs_init(void) | |
2734 | { | |
2735 | return bus_create_file(&pci_bus_type, | |
2736 | &bus_attr_resource_alignment); | |
2737 | } | |
2738 | ||
2739 | late_initcall(pci_resource_alignment_sysfs_init); | |
2740 | ||
32a2eea7 JG |
2741 | static void __devinit pci_no_domains(void) |
2742 | { | |
2743 | #ifdef CONFIG_PCI_DOMAINS | |
2744 | pci_domains_supported = 0; | |
2745 | #endif | |
2746 | } | |
2747 | ||
0ef5f8f6 AP |
2748 | /** |
2749 | * pci_ext_cfg_enabled - can we access extended PCI config space? | |
2750 | * @dev: The PCI device of the root bridge. | |
2751 | * | |
2752 | * Returns 1 if we can access PCI extended config space (offsets | |
2753 | * greater than 0xff). This is the default implementation. Architecture | |
2754 | * implementations can override this. | |
2755 | */ | |
2756 | int __attribute__ ((weak)) pci_ext_cfg_avail(struct pci_dev *dev) | |
2757 | { | |
2758 | return 1; | |
2759 | } | |
2760 | ||
ad04d31e | 2761 | static int __init pci_setup(char *str) |
1da177e4 LT |
2762 | { |
2763 | while (str) { | |
2764 | char *k = strchr(str, ','); | |
2765 | if (k) | |
2766 | *k++ = 0; | |
2767 | if (*str && (str = pcibios_setup(str)) && *str) { | |
309e57df MW |
2768 | if (!strcmp(str, "nomsi")) { |
2769 | pci_no_msi(); | |
7f785763 RD |
2770 | } else if (!strcmp(str, "noaer")) { |
2771 | pci_no_aer(); | |
32a2eea7 JG |
2772 | } else if (!strcmp(str, "nodomains")) { |
2773 | pci_no_domains(); | |
4516a618 AN |
2774 | } else if (!strncmp(str, "cbiosize=", 9)) { |
2775 | pci_cardbus_io_size = memparse(str + 9, &str); | |
2776 | } else if (!strncmp(str, "cbmemsize=", 10)) { | |
2777 | pci_cardbus_mem_size = memparse(str + 10, &str); | |
32a9a682 YS |
2778 | } else if (!strncmp(str, "resource_alignment=", 19)) { |
2779 | pci_set_resource_alignment_param(str + 19, | |
2780 | strlen(str + 19)); | |
43c16408 AP |
2781 | } else if (!strncmp(str, "ecrc=", 5)) { |
2782 | pcie_ecrc_get_policy(str + 5); | |
28760489 EB |
2783 | } else if (!strncmp(str, "hpiosize=", 9)) { |
2784 | pci_hotplug_io_size = memparse(str + 9, &str); | |
2785 | } else if (!strncmp(str, "hpmemsize=", 10)) { | |
2786 | pci_hotplug_mem_size = memparse(str + 10, &str); | |
309e57df MW |
2787 | } else { |
2788 | printk(KERN_ERR "PCI: Unknown option `%s'\n", | |
2789 | str); | |
2790 | } | |
1da177e4 LT |
2791 | } |
2792 | str = k; | |
2793 | } | |
0637a70a | 2794 | return 0; |
1da177e4 | 2795 | } |
0637a70a | 2796 | early_param("pci", pci_setup); |
1da177e4 | 2797 | |
0b62e13b | 2798 | EXPORT_SYMBOL(pci_reenable_device); |
b718989d BH |
2799 | EXPORT_SYMBOL(pci_enable_device_io); |
2800 | EXPORT_SYMBOL(pci_enable_device_mem); | |
1da177e4 | 2801 | EXPORT_SYMBOL(pci_enable_device); |
9ac7849e TH |
2802 | EXPORT_SYMBOL(pcim_enable_device); |
2803 | EXPORT_SYMBOL(pcim_pin_device); | |
1da177e4 | 2804 | EXPORT_SYMBOL(pci_disable_device); |
1da177e4 LT |
2805 | EXPORT_SYMBOL(pci_find_capability); |
2806 | EXPORT_SYMBOL(pci_bus_find_capability); | |
2807 | EXPORT_SYMBOL(pci_release_regions); | |
2808 | EXPORT_SYMBOL(pci_request_regions); | |
e8de1481 | 2809 | EXPORT_SYMBOL(pci_request_regions_exclusive); |
1da177e4 LT |
2810 | EXPORT_SYMBOL(pci_release_region); |
2811 | EXPORT_SYMBOL(pci_request_region); | |
e8de1481 | 2812 | EXPORT_SYMBOL(pci_request_region_exclusive); |
c87deff7 HS |
2813 | EXPORT_SYMBOL(pci_release_selected_regions); |
2814 | EXPORT_SYMBOL(pci_request_selected_regions); | |
e8de1481 | 2815 | EXPORT_SYMBOL(pci_request_selected_regions_exclusive); |
1da177e4 | 2816 | EXPORT_SYMBOL(pci_set_master); |
6a479079 | 2817 | EXPORT_SYMBOL(pci_clear_master); |
1da177e4 | 2818 | EXPORT_SYMBOL(pci_set_mwi); |
694625c0 | 2819 | EXPORT_SYMBOL(pci_try_set_mwi); |
1da177e4 | 2820 | EXPORT_SYMBOL(pci_clear_mwi); |
a04ce0ff | 2821 | EXPORT_SYMBOL_GPL(pci_intx); |
1da177e4 | 2822 | EXPORT_SYMBOL(pci_set_dma_mask); |
1da177e4 LT |
2823 | EXPORT_SYMBOL(pci_set_consistent_dma_mask); |
2824 | EXPORT_SYMBOL(pci_assign_resource); | |
2825 | EXPORT_SYMBOL(pci_find_parent_resource); | |
c87deff7 | 2826 | EXPORT_SYMBOL(pci_select_bars); |
1da177e4 LT |
2827 | |
2828 | EXPORT_SYMBOL(pci_set_power_state); | |
2829 | EXPORT_SYMBOL(pci_save_state); | |
2830 | EXPORT_SYMBOL(pci_restore_state); | |
e5899e1b | 2831 | EXPORT_SYMBOL(pci_pme_capable); |
5a6c9b60 | 2832 | EXPORT_SYMBOL(pci_pme_active); |
1da177e4 | 2833 | EXPORT_SYMBOL(pci_enable_wake); |
0235c4fc | 2834 | EXPORT_SYMBOL(pci_wake_from_d3); |
e5899e1b | 2835 | EXPORT_SYMBOL(pci_target_state); |
404cc2d8 RW |
2836 | EXPORT_SYMBOL(pci_prepare_to_sleep); |
2837 | EXPORT_SYMBOL(pci_back_from_sleep); | |
f7bdd12d | 2838 | EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state); |
1da177e4 | 2839 |