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 int (*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);
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.
705 __pci_reenable_device(struct pci_dev *dev)
707 if (atomic_read(&dev->enable_cnt))
708 return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
713 * pci_enable_device_bars - Initialize some of a device for use
714 * @dev: PCI device to be initialized
715 * @bars: bitmask of BAR's that must be configured
717 * Initialize device before it's used by a driver. Ask low-level code
718 * to enable selected I/O and memory resources. Wake up the device if it
719 * was suspended. Beware, this function can fail.
722 pci_enable_device_bars(struct pci_dev *dev, int bars)
726 if (atomic_add_return(1, &dev->enable_cnt) > 1)
727 return 0; /* already enabled */
729 err = do_pci_enable_device(dev, bars);
731 atomic_dec(&dev->enable_cnt);
736 * pci_enable_device - Initialize device before it's used by a driver.
737 * @dev: PCI device to be initialized
739 * Initialize device before it's used by a driver. Ask low-level code
740 * to enable I/O and memory. Wake up the device if it was suspended.
741 * Beware, this function can fail.
743 * Note we don't actually enable the device many times if we call
744 * this function repeatedly (we just increment the count).
746 int pci_enable_device(struct pci_dev *dev)
748 return pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1);
752 * Managed PCI resources. This manages device on/off, intx/msi/msix
753 * on/off and BAR regions. pci_dev itself records msi/msix status, so
754 * there's no need to track it separately. pci_devres is initialized
755 * when a device is enabled using managed PCI device enable interface.
758 unsigned int enabled:1;
759 unsigned int pinned:1;
760 unsigned int orig_intx:1;
761 unsigned int restore_intx:1;
765 static void pcim_release(struct device *gendev, void *res)
767 struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
768 struct pci_devres *this = res;
771 if (dev->msi_enabled)
772 pci_disable_msi(dev);
773 if (dev->msix_enabled)
774 pci_disable_msix(dev);
776 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
777 if (this->region_mask & (1 << i))
778 pci_release_region(dev, i);
780 if (this->restore_intx)
781 pci_intx(dev, this->orig_intx);
783 if (this->enabled && !this->pinned)
784 pci_disable_device(dev);
787 static struct pci_devres * get_pci_dr(struct pci_dev *pdev)
789 struct pci_devres *dr, *new_dr;
791 dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
795 new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
798 return devres_get(&pdev->dev, new_dr, NULL, NULL);
801 static struct pci_devres * find_pci_dr(struct pci_dev *pdev)
803 if (pci_is_managed(pdev))
804 return devres_find(&pdev->dev, pcim_release, NULL, NULL);
809 * pcim_enable_device - Managed pci_enable_device()
810 * @pdev: PCI device to be initialized
812 * Managed pci_enable_device().
814 int pcim_enable_device(struct pci_dev *pdev)
816 struct pci_devres *dr;
819 dr = get_pci_dr(pdev);
822 WARN_ON(!!dr->enabled);
824 rc = pci_enable_device(pdev);
826 pdev->is_managed = 1;
833 * pcim_pin_device - Pin managed PCI device
834 * @pdev: PCI device to pin
836 * Pin managed PCI device @pdev. Pinned device won't be disabled on
837 * driver detach. @pdev must have been enabled with
838 * pcim_enable_device().
840 void pcim_pin_device(struct pci_dev *pdev)
842 struct pci_devres *dr;
844 dr = find_pci_dr(pdev);
845 WARN_ON(!dr || !dr->enabled);
851 * pcibios_disable_device - disable arch specific PCI resources for device dev
852 * @dev: the PCI device to disable
854 * Disables architecture specific PCI resources for the device. This
855 * is the default implementation. Architecture implementations can
858 void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {}
861 * pci_disable_device - Disable PCI device after use
862 * @dev: PCI device to be disabled
864 * Signal to the system that the PCI device is not in use by the system
865 * anymore. This only involves disabling PCI bus-mastering, if active.
867 * Note we don't actually disable the device until all callers of
868 * pci_device_enable() have called pci_device_disable().
871 pci_disable_device(struct pci_dev *dev)
873 struct pci_devres *dr;
876 dr = find_pci_dr(dev);
880 if (atomic_sub_return(1, &dev->enable_cnt) != 0)
883 pci_read_config_word(dev, PCI_COMMAND, &pci_command);
884 if (pci_command & PCI_COMMAND_MASTER) {
885 pci_command &= ~PCI_COMMAND_MASTER;
886 pci_write_config_word(dev, PCI_COMMAND, pci_command);
888 dev->is_busmaster = 0;
890 pcibios_disable_device(dev);
894 * pcibios_set_pcie_reset_state - set reset state for device dev
895 * @dev: the PCI-E device reset
896 * @state: Reset state to enter into
899 * Sets the PCI-E reset state for the device. This is the default
900 * implementation. Architecture implementations can override this.
902 int __attribute__ ((weak)) pcibios_set_pcie_reset_state(struct pci_dev *dev,
903 enum pcie_reset_state state)
909 * pci_set_pcie_reset_state - set reset state for device dev
910 * @dev: the PCI-E device reset
911 * @state: Reset state to enter into
914 * Sets the PCI reset state for the device.
916 int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
918 return pcibios_set_pcie_reset_state(dev, state);
922 * pci_enable_wake - enable PCI device as wakeup event source
923 * @dev: PCI device affected
924 * @state: PCI state from which device will issue wakeup events
925 * @enable: True to enable event generation; false to disable
927 * This enables the device as a wakeup event source, or disables it.
928 * When such events involves platform-specific hooks, those hooks are
929 * called automatically by this routine.
931 * Devices with legacy power management (no standard PCI PM capabilities)
932 * always require such platform hooks. Depending on the platform, devices
933 * supporting the standard PCI PME# signal may require such platform hooks;
934 * they always update bits in config space to allow PME# generation.
936 * -EIO is returned if the device can't ever be a wakeup event source.
937 * -EINVAL is returned if the device can't generate wakeup events from
938 * the specified PCI state. Returns zero if the operation is successful.
940 int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
946 /* Note that drivers should verify device_may_wakeup(&dev->dev)
947 * before calling this function. Platform code should report
948 * errors when drivers try to enable wakeup on devices that
949 * can't issue wakeups, or on which wakeups were disabled by
950 * userspace updating the /sys/devices.../power/wakeup file.
953 status = call_platform_enable_wakeup(&dev->dev, enable);
955 /* find PCI PM capability in list */
956 pm = pci_find_capability(dev, PCI_CAP_ID_PM);
958 /* If device doesn't support PM Capabilities, but caller wants to
959 * disable wake events, it's a NOP. Otherwise fail unless the
960 * platform hooks handled this legacy device already.
963 return enable ? status : 0;
965 /* Check device's ability to generate PME# */
966 pci_read_config_word(dev,pm+PCI_PM_PMC,&value);
968 value &= PCI_PM_CAP_PME_MASK;
969 value >>= ffs(PCI_PM_CAP_PME_MASK) - 1; /* First bit of mask */
971 /* Check if it can generate PME# from requested state. */
972 if (!value || !(value & (1 << state))) {
973 /* if it can't, revert what the platform hook changed,
974 * always reporting the base "EINVAL, can't PME#" error
977 call_platform_enable_wakeup(&dev->dev, 0);
978 return enable ? -EINVAL : 0;
981 pci_read_config_word(dev, pm + PCI_PM_CTRL, &value);
983 /* Clear PME_Status by writing 1 to it and enable PME# */
984 value |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE;
987 value &= ~PCI_PM_CTRL_PME_ENABLE;
989 pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
995 pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
1003 while (dev->bus->self) {
1004 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1005 dev = dev->bus->self;
1012 * pci_release_region - Release a PCI bar
1013 * @pdev: PCI device whose resources were previously reserved by pci_request_region
1014 * @bar: BAR to release
1016 * Releases the PCI I/O and memory resources previously reserved by a
1017 * successful call to pci_request_region. Call this function only
1018 * after all use of the PCI regions has ceased.
1020 void pci_release_region(struct pci_dev *pdev, int bar)
1022 struct pci_devres *dr;
1024 if (pci_resource_len(pdev, bar) == 0)
1026 if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
1027 release_region(pci_resource_start(pdev, bar),
1028 pci_resource_len(pdev, bar));
1029 else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
1030 release_mem_region(pci_resource_start(pdev, bar),
1031 pci_resource_len(pdev, bar));
1033 dr = find_pci_dr(pdev);
1035 dr->region_mask &= ~(1 << bar);
1039 * pci_request_region - Reserved PCI I/O and memory resource
1040 * @pdev: PCI device whose resources are to be reserved
1041 * @bar: BAR to be reserved
1042 * @res_name: Name to be associated with resource.
1044 * Mark the PCI region associated with PCI device @pdev BR @bar as
1045 * being reserved by owner @res_name. Do not access any
1046 * address inside the PCI regions unless this call returns
1049 * Returns 0 on success, or %EBUSY on error. A warning
1050 * message is also printed on failure.
1052 int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
1054 struct pci_devres *dr;
1056 if (pci_resource_len(pdev, bar) == 0)
1059 if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
1060 if (!request_region(pci_resource_start(pdev, bar),
1061 pci_resource_len(pdev, bar), res_name))
1064 else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
1065 if (!request_mem_region(pci_resource_start(pdev, bar),
1066 pci_resource_len(pdev, bar), res_name))
1070 dr = find_pci_dr(pdev);
1072 dr->region_mask |= 1 << bar;
1077 printk (KERN_WARNING "PCI: Unable to reserve %s region #%d:%llx@%llx "
1079 pci_resource_flags(pdev, bar) & IORESOURCE_IO ? "I/O" : "mem",
1080 bar + 1, /* PCI BAR # */
1081 (unsigned long long)pci_resource_len(pdev, bar),
1082 (unsigned long long)pci_resource_start(pdev, bar),
1088 * pci_release_selected_regions - Release selected PCI I/O and memory resources
1089 * @pdev: PCI device whose resources were previously reserved
1090 * @bars: Bitmask of BARs to be released
1092 * Release selected PCI I/O and memory resources previously reserved.
1093 * Call this function only after all use of the PCI regions has ceased.
1095 void pci_release_selected_regions(struct pci_dev *pdev, int bars)
1099 for (i = 0; i < 6; i++)
1100 if (bars & (1 << i))
1101 pci_release_region(pdev, i);
1105 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
1106 * @pdev: PCI device whose resources are to be reserved
1107 * @bars: Bitmask of BARs to be requested
1108 * @res_name: Name to be associated with resource
1110 int pci_request_selected_regions(struct pci_dev *pdev, int bars,
1111 const char *res_name)
1115 for (i = 0; i < 6; i++)
1116 if (bars & (1 << i))
1117 if(pci_request_region(pdev, i, res_name))
1123 if (bars & (1 << i))
1124 pci_release_region(pdev, i);
1130 * pci_release_regions - Release reserved PCI I/O and memory resources
1131 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
1133 * Releases all PCI I/O and memory resources previously reserved by a
1134 * successful call to pci_request_regions. Call this function only
1135 * after all use of the PCI regions has ceased.
1138 void pci_release_regions(struct pci_dev *pdev)
1140 pci_release_selected_regions(pdev, (1 << 6) - 1);
1144 * pci_request_regions - Reserved PCI I/O and memory resources
1145 * @pdev: PCI device whose resources are to be reserved
1146 * @res_name: Name to be associated with resource.
1148 * Mark all PCI regions associated with PCI device @pdev as
1149 * being reserved by owner @res_name. Do not access any
1150 * address inside the PCI regions unless this call returns
1153 * Returns 0 on success, or %EBUSY on error. A warning
1154 * message is also printed on failure.
1156 int pci_request_regions(struct pci_dev *pdev, const char *res_name)
1158 return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name);
1162 * pci_set_master - enables bus-mastering for device dev
1163 * @dev: the PCI device to enable
1165 * Enables bus-mastering on the device and calls pcibios_set_master()
1166 * to do the needed arch specific settings.
1169 pci_set_master(struct pci_dev *dev)
1173 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1174 if (! (cmd & PCI_COMMAND_MASTER)) {
1175 pr_debug("PCI: Enabling bus mastering for device %s\n", pci_name(dev));
1176 cmd |= PCI_COMMAND_MASTER;
1177 pci_write_config_word(dev, PCI_COMMAND, cmd);
1179 dev->is_busmaster = 1;
1180 pcibios_set_master(dev);
1183 #ifdef PCI_DISABLE_MWI
1184 int pci_set_mwi(struct pci_dev *dev)
1189 int pci_try_set_mwi(struct pci_dev *dev)
1194 void pci_clear_mwi(struct pci_dev *dev)
1200 #ifndef PCI_CACHE_LINE_BYTES
1201 #define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES
1204 /* This can be overridden by arch code. */
1205 /* Don't forget this is measured in 32-bit words, not bytes */
1206 u8 pci_cache_line_size = PCI_CACHE_LINE_BYTES / 4;
1209 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
1210 * @dev: the PCI device for which MWI is to be enabled
1212 * Helper function for pci_set_mwi.
1213 * Originally copied from drivers/net/acenic.c.
1214 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
1216 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1219 pci_set_cacheline_size(struct pci_dev *dev)
1223 if (!pci_cache_line_size)
1224 return -EINVAL; /* The system doesn't support MWI. */
1226 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
1227 equal to or multiple of the right value. */
1228 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
1229 if (cacheline_size >= pci_cache_line_size &&
1230 (cacheline_size % pci_cache_line_size) == 0)
1233 /* Write the correct value. */
1234 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size);
1236 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
1237 if (cacheline_size == pci_cache_line_size)
1240 printk(KERN_DEBUG "PCI: cache line size of %d is not supported "
1241 "by device %s\n", pci_cache_line_size << 2, pci_name(dev));
1247 * pci_set_mwi - enables memory-write-invalidate PCI transaction
1248 * @dev: the PCI device for which MWI is enabled
1250 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
1252 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1255 pci_set_mwi(struct pci_dev *dev)
1260 rc = pci_set_cacheline_size(dev);
1264 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1265 if (! (cmd & PCI_COMMAND_INVALIDATE)) {
1266 pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n",
1268 cmd |= PCI_COMMAND_INVALIDATE;
1269 pci_write_config_word(dev, PCI_COMMAND, cmd);
1276 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
1277 * @dev: the PCI device for which MWI is enabled
1279 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
1280 * Callers are not required to check the return value.
1282 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1284 int pci_try_set_mwi(struct pci_dev *dev)
1286 int rc = pci_set_mwi(dev);
1291 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
1292 * @dev: the PCI device to disable
1294 * Disables PCI Memory-Write-Invalidate transaction on the device
1297 pci_clear_mwi(struct pci_dev *dev)
1301 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1302 if (cmd & PCI_COMMAND_INVALIDATE) {
1303 cmd &= ~PCI_COMMAND_INVALIDATE;
1304 pci_write_config_word(dev, PCI_COMMAND, cmd);
1307 #endif /* ! PCI_DISABLE_MWI */
1310 * pci_intx - enables/disables PCI INTx for device dev
1311 * @pdev: the PCI device to operate on
1312 * @enable: boolean: whether to enable or disable PCI INTx
1314 * Enables/disables PCI INTx for device dev
1317 pci_intx(struct pci_dev *pdev, int enable)
1319 u16 pci_command, new;
1321 pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
1324 new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
1326 new = pci_command | PCI_COMMAND_INTX_DISABLE;
1329 if (new != pci_command) {
1330 struct pci_devres *dr;
1332 pci_write_config_word(pdev, PCI_COMMAND, new);
1334 dr = find_pci_dr(pdev);
1335 if (dr && !dr->restore_intx) {
1336 dr->restore_intx = 1;
1337 dr->orig_intx = !enable;
1343 * pci_msi_off - disables any msi or msix capabilities
1344 * @dev: the PCI device to operate on
1346 * If you want to use msi see pci_enable_msi and friends.
1347 * This is a lower level primitive that allows us to disable
1348 * msi operation at the device level.
1350 void pci_msi_off(struct pci_dev *dev)
1355 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
1357 pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
1358 control &= ~PCI_MSI_FLAGS_ENABLE;
1359 pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
1361 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1363 pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
1364 control &= ~PCI_MSIX_FLAGS_ENABLE;
1365 pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
1369 #ifndef HAVE_ARCH_PCI_SET_DMA_MASK
1371 * These can be overridden by arch-specific implementations
1374 pci_set_dma_mask(struct pci_dev *dev, u64 mask)
1376 if (!pci_dma_supported(dev, mask))
1379 dev->dma_mask = mask;
1385 pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
1387 if (!pci_dma_supported(dev, mask))
1390 dev->dev.coherent_dma_mask = mask;
1397 * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
1398 * @dev: PCI device to query
1400 * Returns mmrbc: maximum designed memory read count in bytes
1401 * or appropriate error value.
1403 int pcix_get_max_mmrbc(struct pci_dev *dev)
1408 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1412 err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat);
1416 return (stat & PCI_X_STATUS_MAX_READ) >> 12;
1418 EXPORT_SYMBOL(pcix_get_max_mmrbc);
1421 * pcix_get_mmrbc - get PCI-X maximum memory read byte count
1422 * @dev: PCI device to query
1424 * Returns mmrbc: maximum memory read count in bytes
1425 * or appropriate error value.
1427 int pcix_get_mmrbc(struct pci_dev *dev)
1432 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1436 ret = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd);
1438 ret = 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2);
1442 EXPORT_SYMBOL(pcix_get_mmrbc);
1445 * pcix_set_mmrbc - set PCI-X maximum memory read byte count
1446 * @dev: PCI device to query
1447 * @mmrbc: maximum memory read count in bytes
1448 * valid values are 512, 1024, 2048, 4096
1450 * If possible sets maximum memory read byte count, some bridges have erratas
1451 * that prevent this.
1453 int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc)
1455 int cap, err = -EINVAL;
1456 u32 stat, cmd, v, o;
1458 if (mmrbc < 512 || mmrbc > 4096 || (mmrbc & (mmrbc-1)))
1461 v = ffs(mmrbc) - 10;
1463 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1467 err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat);
1471 if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21)
1474 err = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd);
1478 o = (cmd & PCI_X_CMD_MAX_READ) >> 2;
1480 if (v > o && dev->bus &&
1481 (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC))
1484 cmd &= ~PCI_X_CMD_MAX_READ;
1486 err = pci_write_config_dword(dev, cap + PCI_X_CMD, cmd);
1491 EXPORT_SYMBOL(pcix_set_mmrbc);
1494 * pcie_get_readrq - get PCI Express read request size
1495 * @dev: PCI device to query
1497 * Returns maximum memory read request in bytes
1498 * or appropriate error value.
1500 int pcie_get_readrq(struct pci_dev *dev)
1505 cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
1509 ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
1511 ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12);
1515 EXPORT_SYMBOL(pcie_get_readrq);
1518 * pcie_set_readrq - set PCI Express maximum memory read request
1519 * @dev: PCI device to query
1520 * @count: maximum memory read count in bytes
1521 * valid values are 128, 256, 512, 1024, 2048, 4096
1523 * If possible sets maximum read byte count
1525 int pcie_set_readrq(struct pci_dev *dev, int rq)
1527 int cap, err = -EINVAL;
1530 if (rq < 128 || rq > 4096 || (rq & (rq-1)))
1533 v = (ffs(rq) - 8) << 12;
1535 cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
1539 err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
1543 if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) {
1544 ctl &= ~PCI_EXP_DEVCTL_READRQ;
1546 err = pci_write_config_dword(dev, cap + PCI_EXP_DEVCTL, ctl);
1552 EXPORT_SYMBOL(pcie_set_readrq);
1555 * pci_select_bars - Make BAR mask from the type of resource
1556 * @dev: the PCI device for which BAR mask is made
1557 * @flags: resource type mask to be selected
1559 * This helper routine makes bar mask from the type of resource.
1561 int pci_select_bars(struct pci_dev *dev, unsigned long flags)
1564 for (i = 0; i < PCI_NUM_RESOURCES; i++)
1565 if (pci_resource_flags(dev, i) & flags)
1570 static int __devinit pci_init(void)
1572 struct pci_dev *dev = NULL;
1574 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1575 pci_fixup_device(pci_fixup_final, dev);
1580 static int __devinit pci_setup(char *str)
1583 char *k = strchr(str, ',');
1586 if (*str && (str = pcibios_setup(str)) && *str) {
1587 if (!strcmp(str, "nomsi")) {
1589 } else if (!strncmp(str, "cbiosize=", 9)) {
1590 pci_cardbus_io_size = memparse(str + 9, &str);
1591 } else if (!strncmp(str, "cbmemsize=", 10)) {
1592 pci_cardbus_mem_size = memparse(str + 10, &str);
1594 printk(KERN_ERR "PCI: Unknown option `%s'\n",
1602 early_param("pci", pci_setup);
1604 device_initcall(pci_init);
1606 EXPORT_SYMBOL_GPL(pci_restore_bars);
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);