2 * $Id: pci.c,v 1.91 1999/01/21 13:34:01 davem Exp $
4 * PCI Bus Services, see include/linux/pci.h for further explanation.
6 * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
9 * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/init.h>
15 #include <linux/pci.h>
17 #include <linux/module.h>
18 #include <linux/spinlock.h>
19 #include <linux/string.h>
20 #include <asm/dma.h> /* isa_dma_bridge_buggy */
23 unsigned int pci_pm_d3_delay = 10;
25 #define DEFAULT_CARDBUS_IO_SIZE (256)
26 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
27 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
28 unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE;
29 unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE;
32 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
33 * @bus: pointer to PCI bus structure to search
35 * Given a PCI bus, returns the highest PCI bus number present in the set
36 * including the given PCI bus and its list of child PCI buses.
38 unsigned char pci_bus_max_busnr(struct pci_bus* bus)
40 struct list_head *tmp;
43 max = bus->subordinate;
44 list_for_each(tmp, &bus->children) {
45 n = pci_bus_max_busnr(pci_bus_b(tmp));
51 EXPORT_SYMBOL_GPL(pci_bus_max_busnr);
55 * pci_max_busnr - returns maximum PCI bus number
57 * Returns the highest PCI bus number present in the system global list of
60 unsigned char __devinit
63 struct pci_bus *bus = NULL;
67 while ((bus = pci_find_next_bus(bus)) != NULL) {
68 n = pci_bus_max_busnr(bus);
77 #define PCI_FIND_CAP_TTL 48
79 static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn,
80 u8 pos, int cap, int *ttl)
85 pci_bus_read_config_byte(bus, devfn, pos, &pos);
89 pci_bus_read_config_byte(bus, devfn, pos + PCI_CAP_LIST_ID,
95 pos += PCI_CAP_LIST_NEXT;
100 static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn,
103 int ttl = PCI_FIND_CAP_TTL;
105 return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl);
108 int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap)
110 return __pci_find_next_cap(dev->bus, dev->devfn,
111 pos + PCI_CAP_LIST_NEXT, cap);
113 EXPORT_SYMBOL_GPL(pci_find_next_capability);
115 static int __pci_bus_find_cap_start(struct pci_bus *bus,
116 unsigned int devfn, u8 hdr_type)
120 pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status);
121 if (!(status & PCI_STATUS_CAP_LIST))
125 case PCI_HEADER_TYPE_NORMAL:
126 case PCI_HEADER_TYPE_BRIDGE:
127 return PCI_CAPABILITY_LIST;
128 case PCI_HEADER_TYPE_CARDBUS:
129 return PCI_CB_CAPABILITY_LIST;
138 * pci_find_capability - query for devices' capabilities
139 * @dev: PCI device to query
140 * @cap: capability code
142 * Tell if a device supports a given PCI capability.
143 * Returns the address of the requested capability structure within the
144 * device's PCI configuration space or 0 in case the device does not
145 * support it. Possible values for @cap:
147 * %PCI_CAP_ID_PM Power Management
148 * %PCI_CAP_ID_AGP Accelerated Graphics Port
149 * %PCI_CAP_ID_VPD Vital Product Data
150 * %PCI_CAP_ID_SLOTID Slot Identification
151 * %PCI_CAP_ID_MSI Message Signalled Interrupts
152 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
153 * %PCI_CAP_ID_PCIX PCI-X
154 * %PCI_CAP_ID_EXP PCI Express
156 int pci_find_capability(struct pci_dev *dev, int cap)
160 pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
162 pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap);
168 * pci_bus_find_capability - query for devices' capabilities
169 * @bus: the PCI bus to query
170 * @devfn: PCI device to query
171 * @cap: capability code
173 * Like pci_find_capability() but works for pci devices that do not have a
174 * pci_dev structure set up yet.
176 * Returns the address of the requested capability structure within the
177 * device's PCI configuration space or 0 in case the device does not
180 int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap)
185 pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type);
187 pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f);
189 pos = __pci_find_next_cap(bus, devfn, pos, cap);
195 * pci_find_ext_capability - Find an extended capability
196 * @dev: PCI device to query
197 * @cap: capability code
199 * Returns the address of the requested extended capability structure
200 * within the device's PCI configuration space or 0 if the device does
201 * not support it. Possible values for @cap:
203 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
204 * %PCI_EXT_CAP_ID_VC Virtual Channel
205 * %PCI_EXT_CAP_ID_DSN Device Serial Number
206 * %PCI_EXT_CAP_ID_PWR Power Budgeting
208 int pci_find_ext_capability(struct pci_dev *dev, int cap)
211 int ttl = 480; /* 3840 bytes, minimum 8 bytes per capability */
214 if (dev->cfg_size <= 256)
217 if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
221 * If we have no capabilities, this is indicated by cap ID,
222 * cap version and next pointer all being 0.
228 if (PCI_EXT_CAP_ID(header) == cap)
231 pos = PCI_EXT_CAP_NEXT(header);
235 if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
241 EXPORT_SYMBOL_GPL(pci_find_ext_capability);
243 static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap)
245 int rc, ttl = PCI_FIND_CAP_TTL;
248 if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST)
249 mask = HT_3BIT_CAP_MASK;
251 mask = HT_5BIT_CAP_MASK;
253 pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos,
254 PCI_CAP_ID_HT, &ttl);
256 rc = pci_read_config_byte(dev, pos + 3, &cap);
257 if (rc != PCIBIOS_SUCCESSFUL)
260 if ((cap & mask) == ht_cap)
263 pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn,
264 pos + PCI_CAP_LIST_NEXT,
265 PCI_CAP_ID_HT, &ttl);
271 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
272 * @dev: PCI device to query
273 * @pos: Position from which to continue searching
274 * @ht_cap: Hypertransport capability code
276 * To be used in conjunction with pci_find_ht_capability() to search for
277 * all capabilities matching @ht_cap. @pos should always be a value returned
278 * from pci_find_ht_capability().
280 * NB. To be 100% safe against broken PCI devices, the caller should take
281 * steps to avoid an infinite loop.
283 int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap)
285 return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap);
287 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability);
290 * pci_find_ht_capability - query a device's Hypertransport capabilities
291 * @dev: PCI device to query
292 * @ht_cap: Hypertransport capability code
294 * Tell if a device supports a given Hypertransport capability.
295 * Returns an address within the device's PCI configuration space
296 * or 0 in case the device does not support the request capability.
297 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
298 * which has a Hypertransport capability matching @ht_cap.
300 int pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
304 pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
306 pos = __pci_find_next_ht_cap(dev, pos, ht_cap);
310 EXPORT_SYMBOL_GPL(pci_find_ht_capability);
313 * pci_find_parent_resource - return resource region of parent bus of given region
314 * @dev: PCI device structure contains resources to be searched
315 * @res: child resource record for which parent is sought
317 * For given resource region of given device, return the resource
318 * region of parent bus the given region is contained in or where
319 * it should be allocated from.
322 pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
324 const struct pci_bus *bus = dev->bus;
326 struct resource *best = NULL;
328 for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
329 struct resource *r = bus->resource[i];
332 if (res->start && !(res->start >= r->start && res->end <= r->end))
333 continue; /* Not contained */
334 if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM))
335 continue; /* Wrong type */
336 if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH))
337 return r; /* Exact match */
338 if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH))
339 best = r; /* Approximating prefetchable by non-prefetchable */
345 * pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
346 * @dev: PCI device to have its BARs restored
348 * Restore the BAR values for a given device, so as to make it
349 * accessible by its driver.
352 pci_restore_bars(struct pci_dev *dev)
356 switch (dev->hdr_type) {
357 case PCI_HEADER_TYPE_NORMAL:
360 case PCI_HEADER_TYPE_BRIDGE:
363 case PCI_HEADER_TYPE_CARDBUS:
367 /* Should never get here, but just in case... */
371 for (i = 0; i < numres; i ++)
372 pci_update_resource(dev, &dev->resource[i], i);
375 int (*platform_pci_set_power_state)(struct pci_dev *dev, pci_power_t t);
378 * pci_set_power_state - Set the power state of a PCI device
379 * @dev: PCI device to be suspended
380 * @state: PCI power state (D0, D1, D2, D3hot, D3cold) we're entering
382 * Transition a device to a new power state, using the Power Management
383 * Capabilities in the device's config space.
386 * -EINVAL if trying to enter a lower state than we're already in.
387 * 0 if we're already in the requested state.
388 * -EIO if device does not support PCI PM.
389 * 0 if we can successfully change the power state.
392 pci_set_power_state(struct pci_dev *dev, pci_power_t state)
394 int pm, need_restore = 0;
397 /* bound the state we're entering */
398 if (state > PCI_D3hot)
402 * If the device or the parent bridge can't support PCI PM, ignore
403 * the request if we're doing anything besides putting it into D0
404 * (which would only happen on boot).
406 if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev))
409 /* find PCI PM capability in list */
410 pm = pci_find_capability(dev, PCI_CAP_ID_PM);
412 /* abort if the device doesn't support PM capabilities */
416 /* Validate current state:
417 * Can enter D0 from any state, but if we can only go deeper
418 * to sleep if we're already in a low power state
420 if (state != PCI_D0 && dev->current_state > state) {
421 printk(KERN_ERR "%s(): %s: state=%d, current state=%d\n",
422 __FUNCTION__, pci_name(dev), state, dev->current_state);
424 } else if (dev->current_state == state)
425 return 0; /* we're already there */
428 pci_read_config_word(dev,pm + PCI_PM_PMC,&pmc);
429 if ((pmc & PCI_PM_CAP_VER_MASK) > 3) {
431 "PCI: %s has unsupported PM cap regs version (%u)\n",
432 pci_name(dev), pmc & PCI_PM_CAP_VER_MASK);
436 /* check if this device supports the desired state */
437 if (state == PCI_D1 && !(pmc & PCI_PM_CAP_D1))
439 else if (state == PCI_D2 && !(pmc & PCI_PM_CAP_D2))
442 pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr);
444 /* If we're (effectively) in D3, force entire word to 0.
445 * This doesn't affect PME_Status, disables PME_En, and
446 * sets PowerState to 0.
448 switch (dev->current_state) {
452 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
455 case PCI_UNKNOWN: /* Boot-up */
456 if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot
457 && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET))
459 /* Fall-through: force to D0 */
465 /* enter specified state */
466 pci_write_config_word(dev, pm + PCI_PM_CTRL, pmcsr);
468 /* Mandatory power management transition delays */
469 /* see PCI PM 1.1 5.6.1 table 18 */
470 if (state == PCI_D3hot || dev->current_state == PCI_D3hot)
471 msleep(pci_pm_d3_delay);
472 else if (state == PCI_D2 || dev->current_state == PCI_D2)
476 * Give firmware a chance to be called, such as ACPI _PRx, _PSx
477 * Firmware method after native method ?
479 if (platform_pci_set_power_state)
480 platform_pci_set_power_state(dev, state);
482 dev->current_state = state;
484 /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
485 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
486 * from D3hot to D0 _may_ perform an internal reset, thereby
487 * going to "D0 Uninitialized" rather than "D0 Initialized".
488 * For example, at least some versions of the 3c905B and the
489 * 3c556B exhibit this behaviour.
491 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
492 * devices in a D3hot state at boot. Consequently, we need to
493 * restore at least the BARs so that the device will be
494 * accessible to its driver.
497 pci_restore_bars(dev);
502 pci_power_t (*platform_pci_choose_state)(struct pci_dev *dev, pm_message_t state);
505 * pci_choose_state - Choose the power state of a PCI device
506 * @dev: PCI device to be suspended
507 * @state: target sleep state for the whole system. This is the value
508 * that is passed to suspend() function.
510 * Returns PCI power state suitable for given device and given system
514 pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
518 if (!pci_find_capability(dev, PCI_CAP_ID_PM))
521 if (platform_pci_choose_state) {
522 ret = platform_pci_choose_state(dev, state);
523 if (ret != PCI_POWER_ERROR)
527 switch (state.event) {
530 case PM_EVENT_FREEZE:
531 case PM_EVENT_PRETHAW:
532 /* REVISIT both freeze and pre-thaw "should" use D0 */
533 case PM_EVENT_SUSPEND:
536 printk("Unrecognized suspend event %d\n", state.event);
542 EXPORT_SYMBOL(pci_choose_state);
544 static int pci_save_pcie_state(struct pci_dev *dev)
547 struct pci_cap_saved_state *save_state;
550 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
554 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
556 save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL);
558 dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
561 cap = (u16 *)&save_state->data[0];
563 pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
564 pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
565 pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
566 pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
567 pci_add_saved_cap(dev, save_state);
571 static void pci_restore_pcie_state(struct pci_dev *dev)
574 struct pci_cap_saved_state *save_state;
577 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
578 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
579 if (!save_state || pos <= 0)
581 cap = (u16 *)&save_state->data[0];
583 pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
584 pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
585 pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
586 pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
590 static int pci_save_pcix_state(struct pci_dev *dev)
593 struct pci_cap_saved_state *save_state;
596 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
600 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
602 save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
604 dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
607 cap = (u16 *)&save_state->data[0];
609 pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
610 pci_add_saved_cap(dev, save_state);
614 static void pci_restore_pcix_state(struct pci_dev *dev)
617 struct pci_cap_saved_state *save_state;
620 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
621 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
622 if (!save_state || pos <= 0)
624 cap = (u16 *)&save_state->data[0];
626 pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
631 * pci_save_state - save the PCI configuration space of a device before suspending
632 * @dev: - PCI device that we're dealing with
635 pci_save_state(struct pci_dev *dev)
638 /* XXX: 100% dword access ok here? */
639 for (i = 0; i < 16; i++)
640 pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]);
641 if ((i = pci_save_pcie_state(dev)) != 0)
643 if ((i = pci_save_pcix_state(dev)) != 0)
649 * pci_restore_state - Restore the saved state of a PCI device
650 * @dev: - PCI device that we're dealing with
653 pci_restore_state(struct pci_dev *dev)
658 /* PCI Express register must be restored first */
659 pci_restore_pcie_state(dev);
662 * The Base Address register should be programmed before the command
665 for (i = 15; i >= 0; i--) {
666 pci_read_config_dword(dev, i * 4, &val);
667 if (val != dev->saved_config_space[i]) {
668 printk(KERN_DEBUG "PM: Writing back config space on "
669 "device %s at offset %x (was %x, writing %x)\n",
671 val, (int)dev->saved_config_space[i]);
672 pci_write_config_dword(dev,i * 4,
673 dev->saved_config_space[i]);
676 pci_restore_pcix_state(dev);
677 pci_restore_msi_state(dev);
682 static int do_pci_enable_device(struct pci_dev *dev, int bars)
686 err = pci_set_power_state(dev, PCI_D0);
687 if (err < 0 && err != -EIO)
689 err = pcibios_enable_device(dev, bars);
692 pci_fixup_device(pci_fixup_enable, dev);
698 * pci_reenable_device - Resume abandoned device
699 * @dev: PCI device to be resumed
701 * Note this function is a backend of pci_default_resume and is not supposed
702 * to be called by normal code, write proper resume handler and use it instead.
704 int pci_reenable_device(struct pci_dev *dev)
706 if (atomic_read(&dev->enable_cnt))
707 return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
712 * pci_enable_device_bars - Initialize some of a device for use
713 * @dev: PCI device to be initialized
714 * @bars: bitmask of BAR's that must be configured
716 * Initialize device before it's used by a driver. Ask low-level code
717 * to enable selected I/O and memory resources. Wake up the device if it
718 * was suspended. Beware, this function can fail.
721 pci_enable_device_bars(struct pci_dev *dev, int bars)
725 if (atomic_add_return(1, &dev->enable_cnt) > 1)
726 return 0; /* already enabled */
728 err = do_pci_enable_device(dev, bars);
730 atomic_dec(&dev->enable_cnt);
735 * pci_enable_device - Initialize device before it's used by a driver.
736 * @dev: PCI device to be initialized
738 * Initialize device before it's used by a driver. Ask low-level code
739 * to enable I/O and memory. Wake up the device if it was suspended.
740 * Beware, this function can fail.
742 * Note we don't actually enable the device many times if we call
743 * this function repeatedly (we just increment the count).
745 int pci_enable_device(struct pci_dev *dev)
747 return pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1);
751 * Managed PCI resources. This manages device on/off, intx/msi/msix
752 * on/off and BAR regions. pci_dev itself records msi/msix status, so
753 * there's no need to track it separately. pci_devres is initialized
754 * when a device is enabled using managed PCI device enable interface.
757 unsigned int enabled:1;
758 unsigned int pinned:1;
759 unsigned int orig_intx:1;
760 unsigned int restore_intx:1;
764 static void pcim_release(struct device *gendev, void *res)
766 struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
767 struct pci_devres *this = res;
770 if (dev->msi_enabled)
771 pci_disable_msi(dev);
772 if (dev->msix_enabled)
773 pci_disable_msix(dev);
775 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
776 if (this->region_mask & (1 << i))
777 pci_release_region(dev, i);
779 if (this->restore_intx)
780 pci_intx(dev, this->orig_intx);
782 if (this->enabled && !this->pinned)
783 pci_disable_device(dev);
786 static struct pci_devres * get_pci_dr(struct pci_dev *pdev)
788 struct pci_devres *dr, *new_dr;
790 dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
794 new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
797 return devres_get(&pdev->dev, new_dr, NULL, NULL);
800 static struct pci_devres * find_pci_dr(struct pci_dev *pdev)
802 if (pci_is_managed(pdev))
803 return devres_find(&pdev->dev, pcim_release, NULL, NULL);
808 * pcim_enable_device - Managed pci_enable_device()
809 * @pdev: PCI device to be initialized
811 * Managed pci_enable_device().
813 int pcim_enable_device(struct pci_dev *pdev)
815 struct pci_devres *dr;
818 dr = get_pci_dr(pdev);
821 WARN_ON(!!dr->enabled);
823 rc = pci_enable_device(pdev);
825 pdev->is_managed = 1;
832 * pcim_pin_device - Pin managed PCI device
833 * @pdev: PCI device to pin
835 * Pin managed PCI device @pdev. Pinned device won't be disabled on
836 * driver detach. @pdev must have been enabled with
837 * pcim_enable_device().
839 void pcim_pin_device(struct pci_dev *pdev)
841 struct pci_devres *dr;
843 dr = find_pci_dr(pdev);
844 WARN_ON(!dr || !dr->enabled);
850 * pcibios_disable_device - disable arch specific PCI resources for device dev
851 * @dev: the PCI device to disable
853 * Disables architecture specific PCI resources for the device. This
854 * is the default implementation. Architecture implementations can
857 void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {}
860 * pci_disable_device - Disable PCI device after use
861 * @dev: PCI device to be disabled
863 * Signal to the system that the PCI device is not in use by the system
864 * anymore. This only involves disabling PCI bus-mastering, if active.
866 * Note we don't actually disable the device until all callers of
867 * pci_device_enable() have called pci_device_disable().
870 pci_disable_device(struct pci_dev *dev)
872 struct pci_devres *dr;
875 dr = find_pci_dr(dev);
879 if (atomic_sub_return(1, &dev->enable_cnt) != 0)
882 pci_read_config_word(dev, PCI_COMMAND, &pci_command);
883 if (pci_command & PCI_COMMAND_MASTER) {
884 pci_command &= ~PCI_COMMAND_MASTER;
885 pci_write_config_word(dev, PCI_COMMAND, pci_command);
887 dev->is_busmaster = 0;
889 pcibios_disable_device(dev);
893 * pcibios_set_pcie_reset_state - set reset state for device dev
894 * @dev: the PCI-E device reset
895 * @state: Reset state to enter into
898 * Sets the PCI-E reset state for the device. This is the default
899 * implementation. Architecture implementations can override this.
901 int __attribute__ ((weak)) pcibios_set_pcie_reset_state(struct pci_dev *dev,
902 enum pcie_reset_state state)
908 * pci_set_pcie_reset_state - set reset state for device dev
909 * @dev: the PCI-E device reset
910 * @state: Reset state to enter into
913 * Sets the PCI reset state for the device.
915 int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
917 return pcibios_set_pcie_reset_state(dev, state);
921 * pci_enable_wake - enable PCI device as wakeup event source
922 * @dev: PCI device affected
923 * @state: PCI state from which device will issue wakeup events
924 * @enable: True to enable event generation; false to disable
926 * This enables the device as a wakeup event source, or disables it.
927 * When such events involves platform-specific hooks, those hooks are
928 * called automatically by this routine.
930 * Devices with legacy power management (no standard PCI PM capabilities)
931 * always require such platform hooks. Depending on the platform, devices
932 * supporting the standard PCI PME# signal may require such platform hooks;
933 * they always update bits in config space to allow PME# generation.
935 * -EIO is returned if the device can't ever be a wakeup event source.
936 * -EINVAL is returned if the device can't generate wakeup events from
937 * the specified PCI state. Returns zero if the operation is successful.
939 int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
945 /* Note that drivers should verify device_may_wakeup(&dev->dev)
946 * before calling this function. Platform code should report
947 * errors when drivers try to enable wakeup on devices that
948 * can't issue wakeups, or on which wakeups were disabled by
949 * userspace updating the /sys/devices.../power/wakeup file.
952 status = call_platform_enable_wakeup(&dev->dev, enable);
954 /* find PCI PM capability in list */
955 pm = pci_find_capability(dev, PCI_CAP_ID_PM);
957 /* If device doesn't support PM Capabilities, but caller wants to
958 * disable wake events, it's a NOP. Otherwise fail unless the
959 * platform hooks handled this legacy device already.
962 return enable ? status : 0;
964 /* Check device's ability to generate PME# */
965 pci_read_config_word(dev,pm+PCI_PM_PMC,&value);
967 value &= PCI_PM_CAP_PME_MASK;
968 value >>= ffs(PCI_PM_CAP_PME_MASK) - 1; /* First bit of mask */
970 /* Check if it can generate PME# from requested state. */
971 if (!value || !(value & (1 << state))) {
972 /* if it can't, revert what the platform hook changed,
973 * always reporting the base "EINVAL, can't PME#" error
976 call_platform_enable_wakeup(&dev->dev, 0);
977 return enable ? -EINVAL : 0;
980 pci_read_config_word(dev, pm + PCI_PM_CTRL, &value);
982 /* Clear PME_Status by writing 1 to it and enable PME# */
983 value |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE;
986 value &= ~PCI_PM_CTRL_PME_ENABLE;
988 pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
994 pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
1002 while (dev->bus->self) {
1003 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1004 dev = dev->bus->self;
1011 * pci_release_region - Release a PCI bar
1012 * @pdev: PCI device whose resources were previously reserved by pci_request_region
1013 * @bar: BAR to release
1015 * Releases the PCI I/O and memory resources previously reserved by a
1016 * successful call to pci_request_region. Call this function only
1017 * after all use of the PCI regions has ceased.
1019 void pci_release_region(struct pci_dev *pdev, int bar)
1021 struct pci_devres *dr;
1023 if (pci_resource_len(pdev, bar) == 0)
1025 if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
1026 release_region(pci_resource_start(pdev, bar),
1027 pci_resource_len(pdev, bar));
1028 else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
1029 release_mem_region(pci_resource_start(pdev, bar),
1030 pci_resource_len(pdev, bar));
1032 dr = find_pci_dr(pdev);
1034 dr->region_mask &= ~(1 << bar);
1038 * pci_request_region - Reserved PCI I/O and memory resource
1039 * @pdev: PCI device whose resources are to be reserved
1040 * @bar: BAR to be reserved
1041 * @res_name: Name to be associated with resource.
1043 * Mark the PCI region associated with PCI device @pdev BR @bar as
1044 * being reserved by owner @res_name. Do not access any
1045 * address inside the PCI regions unless this call returns
1048 * Returns 0 on success, or %EBUSY on error. A warning
1049 * message is also printed on failure.
1051 int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
1053 struct pci_devres *dr;
1055 if (pci_resource_len(pdev, bar) == 0)
1058 if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
1059 if (!request_region(pci_resource_start(pdev, bar),
1060 pci_resource_len(pdev, bar), res_name))
1063 else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
1064 if (!request_mem_region(pci_resource_start(pdev, bar),
1065 pci_resource_len(pdev, bar), res_name))
1069 dr = find_pci_dr(pdev);
1071 dr->region_mask |= 1 << bar;
1076 printk (KERN_WARNING "PCI: Unable to reserve %s region #%d:%llx@%llx "
1078 pci_resource_flags(pdev, bar) & IORESOURCE_IO ? "I/O" : "mem",
1079 bar + 1, /* PCI BAR # */
1080 (unsigned long long)pci_resource_len(pdev, bar),
1081 (unsigned long long)pci_resource_start(pdev, bar),
1087 * pci_release_selected_regions - Release selected PCI I/O and memory resources
1088 * @pdev: PCI device whose resources were previously reserved
1089 * @bars: Bitmask of BARs to be released
1091 * Release selected PCI I/O and memory resources previously reserved.
1092 * Call this function only after all use of the PCI regions has ceased.
1094 void pci_release_selected_regions(struct pci_dev *pdev, int bars)
1098 for (i = 0; i < 6; i++)
1099 if (bars & (1 << i))
1100 pci_release_region(pdev, i);
1104 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
1105 * @pdev: PCI device whose resources are to be reserved
1106 * @bars: Bitmask of BARs to be requested
1107 * @res_name: Name to be associated with resource
1109 int pci_request_selected_regions(struct pci_dev *pdev, int bars,
1110 const char *res_name)
1114 for (i = 0; i < 6; i++)
1115 if (bars & (1 << i))
1116 if(pci_request_region(pdev, i, res_name))
1122 if (bars & (1 << i))
1123 pci_release_region(pdev, i);
1129 * pci_release_regions - Release reserved PCI I/O and memory resources
1130 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
1132 * Releases all PCI I/O and memory resources previously reserved by a
1133 * successful call to pci_request_regions. Call this function only
1134 * after all use of the PCI regions has ceased.
1137 void pci_release_regions(struct pci_dev *pdev)
1139 pci_release_selected_regions(pdev, (1 << 6) - 1);
1143 * pci_request_regions - Reserved PCI I/O and memory resources
1144 * @pdev: PCI device whose resources are to be reserved
1145 * @res_name: Name to be associated with resource.
1147 * Mark all PCI regions associated with PCI device @pdev as
1148 * being reserved by owner @res_name. Do not access any
1149 * address inside the PCI regions unless this call returns
1152 * Returns 0 on success, or %EBUSY on error. A warning
1153 * message is also printed on failure.
1155 int pci_request_regions(struct pci_dev *pdev, const char *res_name)
1157 return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name);
1161 * pci_set_master - enables bus-mastering for device dev
1162 * @dev: the PCI device to enable
1164 * Enables bus-mastering on the device and calls pcibios_set_master()
1165 * to do the needed arch specific settings.
1168 pci_set_master(struct pci_dev *dev)
1172 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1173 if (! (cmd & PCI_COMMAND_MASTER)) {
1174 pr_debug("PCI: Enabling bus mastering for device %s\n", pci_name(dev));
1175 cmd |= PCI_COMMAND_MASTER;
1176 pci_write_config_word(dev, PCI_COMMAND, cmd);
1178 dev->is_busmaster = 1;
1179 pcibios_set_master(dev);
1182 #ifdef PCI_DISABLE_MWI
1183 int pci_set_mwi(struct pci_dev *dev)
1188 int pci_try_set_mwi(struct pci_dev *dev)
1193 void pci_clear_mwi(struct pci_dev *dev)
1199 #ifndef PCI_CACHE_LINE_BYTES
1200 #define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES
1203 /* This can be overridden by arch code. */
1204 /* Don't forget this is measured in 32-bit words, not bytes */
1205 u8 pci_cache_line_size = PCI_CACHE_LINE_BYTES / 4;
1208 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
1209 * @dev: the PCI device for which MWI is to be enabled
1211 * Helper function for pci_set_mwi.
1212 * Originally copied from drivers/net/acenic.c.
1213 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
1215 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1218 pci_set_cacheline_size(struct pci_dev *dev)
1222 if (!pci_cache_line_size)
1223 return -EINVAL; /* The system doesn't support MWI. */
1225 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
1226 equal to or multiple of the right value. */
1227 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
1228 if (cacheline_size >= pci_cache_line_size &&
1229 (cacheline_size % pci_cache_line_size) == 0)
1232 /* Write the correct value. */
1233 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size);
1235 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
1236 if (cacheline_size == pci_cache_line_size)
1239 printk(KERN_DEBUG "PCI: cache line size of %d is not supported "
1240 "by device %s\n", pci_cache_line_size << 2, pci_name(dev));
1246 * pci_set_mwi - enables memory-write-invalidate PCI transaction
1247 * @dev: the PCI device for which MWI is enabled
1249 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
1251 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1254 pci_set_mwi(struct pci_dev *dev)
1259 rc = pci_set_cacheline_size(dev);
1263 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1264 if (! (cmd & PCI_COMMAND_INVALIDATE)) {
1265 pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n",
1267 cmd |= PCI_COMMAND_INVALIDATE;
1268 pci_write_config_word(dev, PCI_COMMAND, cmd);
1275 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
1276 * @dev: the PCI device for which MWI is enabled
1278 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
1279 * Callers are not required to check the return value.
1281 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1283 int pci_try_set_mwi(struct pci_dev *dev)
1285 int rc = pci_set_mwi(dev);
1290 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
1291 * @dev: the PCI device to disable
1293 * Disables PCI Memory-Write-Invalidate transaction on the device
1296 pci_clear_mwi(struct pci_dev *dev)
1300 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1301 if (cmd & PCI_COMMAND_INVALIDATE) {
1302 cmd &= ~PCI_COMMAND_INVALIDATE;
1303 pci_write_config_word(dev, PCI_COMMAND, cmd);
1306 #endif /* ! PCI_DISABLE_MWI */
1309 * pci_intx - enables/disables PCI INTx for device dev
1310 * @pdev: the PCI device to operate on
1311 * @enable: boolean: whether to enable or disable PCI INTx
1313 * Enables/disables PCI INTx for device dev
1316 pci_intx(struct pci_dev *pdev, int enable)
1318 u16 pci_command, new;
1320 pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
1323 new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
1325 new = pci_command | PCI_COMMAND_INTX_DISABLE;
1328 if (new != pci_command) {
1329 struct pci_devres *dr;
1331 pci_write_config_word(pdev, PCI_COMMAND, new);
1333 dr = find_pci_dr(pdev);
1334 if (dr && !dr->restore_intx) {
1335 dr->restore_intx = 1;
1336 dr->orig_intx = !enable;
1342 * pci_msi_off - disables any msi or msix capabilities
1343 * @dev: the PCI device to operate on
1345 * If you want to use msi see pci_enable_msi and friends.
1346 * This is a lower level primitive that allows us to disable
1347 * msi operation at the device level.
1349 void pci_msi_off(struct pci_dev *dev)
1354 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
1356 pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
1357 control &= ~PCI_MSI_FLAGS_ENABLE;
1358 pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
1360 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1362 pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
1363 control &= ~PCI_MSIX_FLAGS_ENABLE;
1364 pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
1368 #ifndef HAVE_ARCH_PCI_SET_DMA_MASK
1370 * These can be overridden by arch-specific implementations
1373 pci_set_dma_mask(struct pci_dev *dev, u64 mask)
1375 if (!pci_dma_supported(dev, mask))
1378 dev->dma_mask = mask;
1384 pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
1386 if (!pci_dma_supported(dev, mask))
1389 dev->dev.coherent_dma_mask = mask;
1396 * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
1397 * @dev: PCI device to query
1399 * Returns mmrbc: maximum designed memory read count in bytes
1400 * or appropriate error value.
1402 int pcix_get_max_mmrbc(struct pci_dev *dev)
1407 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1411 err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat);
1415 return (stat & PCI_X_STATUS_MAX_READ) >> 12;
1417 EXPORT_SYMBOL(pcix_get_max_mmrbc);
1420 * pcix_get_mmrbc - get PCI-X maximum memory read byte count
1421 * @dev: PCI device to query
1423 * Returns mmrbc: maximum memory read count in bytes
1424 * or appropriate error value.
1426 int pcix_get_mmrbc(struct pci_dev *dev)
1431 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1435 ret = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd);
1437 ret = 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2);
1441 EXPORT_SYMBOL(pcix_get_mmrbc);
1444 * pcix_set_mmrbc - set PCI-X maximum memory read byte count
1445 * @dev: PCI device to query
1446 * @mmrbc: maximum memory read count in bytes
1447 * valid values are 512, 1024, 2048, 4096
1449 * If possible sets maximum memory read byte count, some bridges have erratas
1450 * that prevent this.
1452 int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc)
1454 int cap, err = -EINVAL;
1455 u32 stat, cmd, v, o;
1457 if (mmrbc < 512 || mmrbc > 4096 || (mmrbc & (mmrbc-1)))
1460 v = ffs(mmrbc) - 10;
1462 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1466 err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat);
1470 if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21)
1473 err = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd);
1477 o = (cmd & PCI_X_CMD_MAX_READ) >> 2;
1479 if (v > o && dev->bus &&
1480 (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC))
1483 cmd &= ~PCI_X_CMD_MAX_READ;
1485 err = pci_write_config_dword(dev, cap + PCI_X_CMD, cmd);
1490 EXPORT_SYMBOL(pcix_set_mmrbc);
1493 * pcie_get_readrq - get PCI Express read request size
1494 * @dev: PCI device to query
1496 * Returns maximum memory read request in bytes
1497 * or appropriate error value.
1499 int pcie_get_readrq(struct pci_dev *dev)
1504 cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
1508 ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
1510 ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12);
1514 EXPORT_SYMBOL(pcie_get_readrq);
1517 * pcie_set_readrq - set PCI Express maximum memory read request
1518 * @dev: PCI device to query
1519 * @rq: maximum memory read count in bytes
1520 * valid values are 128, 256, 512, 1024, 2048, 4096
1522 * If possible sets maximum read byte count
1524 int pcie_set_readrq(struct pci_dev *dev, int rq)
1526 int cap, err = -EINVAL;
1529 if (rq < 128 || rq > 4096 || (rq & (rq-1)))
1532 v = (ffs(rq) - 8) << 12;
1534 cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
1538 err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
1542 if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) {
1543 ctl &= ~PCI_EXP_DEVCTL_READRQ;
1545 err = pci_write_config_dword(dev, cap + PCI_EXP_DEVCTL, ctl);
1551 EXPORT_SYMBOL(pcie_set_readrq);
1554 * pci_select_bars - Make BAR mask from the type of resource
1555 * @dev: the PCI device for which BAR mask is made
1556 * @flags: resource type mask to be selected
1558 * This helper routine makes bar mask from the type of resource.
1560 int pci_select_bars(struct pci_dev *dev, unsigned long flags)
1563 for (i = 0; i < PCI_NUM_RESOURCES; i++)
1564 if (pci_resource_flags(dev, i) & flags)
1569 static int __devinit pci_init(void)
1571 struct pci_dev *dev = NULL;
1573 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1574 pci_fixup_device(pci_fixup_final, dev);
1579 static int __devinit pci_setup(char *str)
1582 char *k = strchr(str, ',');
1585 if (*str && (str = pcibios_setup(str)) && *str) {
1586 if (!strcmp(str, "nomsi")) {
1588 } else if (!strncmp(str, "cbiosize=", 9)) {
1589 pci_cardbus_io_size = memparse(str + 9, &str);
1590 } else if (!strncmp(str, "cbmemsize=", 10)) {
1591 pci_cardbus_mem_size = memparse(str + 10, &str);
1593 printk(KERN_ERR "PCI: Unknown option `%s'\n",
1601 early_param("pci", pci_setup);
1603 device_initcall(pci_init);
1605 EXPORT_SYMBOL_GPL(pci_restore_bars);
1606 EXPORT_SYMBOL(pci_reenable_device);
1607 EXPORT_SYMBOL(pci_enable_device_bars);
1608 EXPORT_SYMBOL(pci_enable_device);
1609 EXPORT_SYMBOL(pcim_enable_device);
1610 EXPORT_SYMBOL(pcim_pin_device);
1611 EXPORT_SYMBOL(pci_disable_device);
1612 EXPORT_SYMBOL(pci_find_capability);
1613 EXPORT_SYMBOL(pci_bus_find_capability);
1614 EXPORT_SYMBOL(pci_release_regions);
1615 EXPORT_SYMBOL(pci_request_regions);
1616 EXPORT_SYMBOL(pci_release_region);
1617 EXPORT_SYMBOL(pci_request_region);
1618 EXPORT_SYMBOL(pci_release_selected_regions);
1619 EXPORT_SYMBOL(pci_request_selected_regions);
1620 EXPORT_SYMBOL(pci_set_master);
1621 EXPORT_SYMBOL(pci_set_mwi);
1622 EXPORT_SYMBOL(pci_try_set_mwi);
1623 EXPORT_SYMBOL(pci_clear_mwi);
1624 EXPORT_SYMBOL_GPL(pci_intx);
1625 EXPORT_SYMBOL(pci_set_dma_mask);
1626 EXPORT_SYMBOL(pci_set_consistent_dma_mask);
1627 EXPORT_SYMBOL(pci_assign_resource);
1628 EXPORT_SYMBOL(pci_find_parent_resource);
1629 EXPORT_SYMBOL(pci_select_bars);
1631 EXPORT_SYMBOL(pci_set_power_state);
1632 EXPORT_SYMBOL(pci_save_state);
1633 EXPORT_SYMBOL(pci_restore_state);
1634 EXPORT_SYMBOL(pci_enable_wake);
1635 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);