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>
16 #include <linux/module.h>
17 #include <linux/spinlock.h>
18 #include <linux/string.h>
19 #include <asm/dma.h> /* isa_dma_bridge_buggy */
22 unsigned int pci_pm_d3_delay = 10;
24 #define DEFAULT_CARDBUS_IO_SIZE (256)
25 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
26 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
27 unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE;
28 unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE;
31 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
32 * @bus: pointer to PCI bus structure to search
34 * Given a PCI bus, returns the highest PCI bus number present in the set
35 * including the given PCI bus and its list of child PCI buses.
37 unsigned char __devinit
38 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 /* Validate current state:
410 * Can enter D0 from any state, but if we can only go deeper
411 * to sleep if we're already in a low power state
413 if (state != PCI_D0 && dev->current_state > state) {
414 printk(KERN_ERR "%s(): %s: state=%d, current state=%d\n",
415 __FUNCTION__, pci_name(dev), state, dev->current_state);
417 } else if (dev->current_state == state)
418 return 0; /* we're already there */
421 /* find PCI PM capability in list */
422 pm = pci_find_capability(dev, PCI_CAP_ID_PM);
424 /* abort if the device doesn't support PM capabilities */
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 = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL);
556 dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
559 cap = (u16 *)&save_state->data[0];
561 pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
562 pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
563 pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
564 pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
565 pci_add_saved_cap(dev, save_state);
569 static void pci_restore_pcie_state(struct pci_dev *dev)
572 struct pci_cap_saved_state *save_state;
575 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
576 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
577 if (!save_state || pos <= 0)
579 cap = (u16 *)&save_state->data[0];
581 pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
582 pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
583 pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
584 pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
585 pci_remove_saved_cap(save_state);
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 = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
602 dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
605 cap = (u16 *)&save_state->data[0];
607 pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
608 pci_add_saved_cap(dev, save_state);
612 static void pci_restore_pcix_state(struct pci_dev *dev)
615 struct pci_cap_saved_state *save_state;
618 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
619 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
620 if (!save_state || pos <= 0)
622 cap = (u16 *)&save_state->data[0];
624 pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
625 pci_remove_saved_cap(save_state);
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_msi_state(dev)) != 0)
643 if ((i = pci_save_pcie_state(dev)) != 0)
645 if ((i = pci_save_pcix_state(dev)) != 0)
651 * pci_restore_state - Restore the saved state of a PCI device
652 * @dev: - PCI device that we're dealing with
655 pci_restore_state(struct pci_dev *dev)
660 /* PCI Express register must be restored first */
661 pci_restore_pcie_state(dev);
664 * The Base Address register should be programmed before the command
667 for (i = 15; i >= 0; i--) {
668 pci_read_config_dword(dev, i * 4, &val);
669 if (val != dev->saved_config_space[i]) {
670 printk(KERN_DEBUG "PM: Writing back config space on "
671 "device %s at offset %x (was %x, writing %x)\n",
673 val, (int)dev->saved_config_space[i]);
674 pci_write_config_dword(dev,i * 4,
675 dev->saved_config_space[i]);
678 pci_restore_pcix_state(dev);
679 pci_restore_msi_state(dev);
684 static int do_pci_enable_device(struct pci_dev *dev, int bars)
688 err = pci_set_power_state(dev, PCI_D0);
689 if (err < 0 && err != -EIO)
691 err = pcibios_enable_device(dev, bars);
694 pci_fixup_device(pci_fixup_enable, dev);
700 * __pci_reenable_device - Resume abandoned device
701 * @dev: PCI device to be resumed
703 * Note this function is a backend of pci_default_resume and is not supposed
704 * to be called by normal code, write proper resume handler and use it instead.
707 __pci_reenable_device(struct pci_dev *dev)
709 if (atomic_read(&dev->enable_cnt))
710 return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
715 * pci_enable_device_bars - Initialize some of a device for use
716 * @dev: PCI device to be initialized
717 * @bars: bitmask of BAR's that must be configured
719 * Initialize device before it's used by a driver. Ask low-level code
720 * to enable selected I/O and memory resources. Wake up the device if it
721 * was suspended. Beware, this function can fail.
724 pci_enable_device_bars(struct pci_dev *dev, int bars)
728 if (atomic_add_return(1, &dev->enable_cnt) > 1)
729 return 0; /* already enabled */
731 err = do_pci_enable_device(dev, bars);
733 atomic_dec(&dev->enable_cnt);
738 * pci_enable_device - Initialize device before it's used by a driver.
739 * @dev: PCI device to be initialized
741 * Initialize device before it's used by a driver. Ask low-level code
742 * to enable I/O and memory. Wake up the device if it was suspended.
743 * Beware, this function can fail.
745 * Note we don't actually enable the device many times if we call
746 * this function repeatedly (we just increment the count).
748 int pci_enable_device(struct pci_dev *dev)
750 return pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1);
754 * Managed PCI resources. This manages device on/off, intx/msi/msix
755 * on/off and BAR regions. pci_dev itself records msi/msix status, so
756 * there's no need to track it separately. pci_devres is initialized
757 * when a device is enabled using managed PCI device enable interface.
760 unsigned int disable:1;
761 unsigned int orig_intx:1;
762 unsigned int restore_intx:1;
766 static void pcim_release(struct device *gendev, void *res)
768 struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
769 struct pci_devres *this = res;
772 if (dev->msi_enabled)
773 pci_disable_msi(dev);
774 if (dev->msix_enabled)
775 pci_disable_msix(dev);
777 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
778 if (this->region_mask & (1 << i))
779 pci_release_region(dev, i);
781 if (this->restore_intx)
782 pci_intx(dev, this->orig_intx);
785 pci_disable_device(dev);
788 static struct pci_devres * get_pci_dr(struct pci_dev *pdev)
790 struct pci_devres *dr, *new_dr;
792 dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
796 new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
799 return devres_get(&pdev->dev, new_dr, NULL, NULL);
802 static struct pci_devres * find_pci_dr(struct pci_dev *pdev)
804 if (pci_is_managed(pdev))
805 return devres_find(&pdev->dev, pcim_release, NULL, NULL);
810 * pcim_enable_device - Managed pci_enable_device()
811 * @pdev: PCI device to be initialized
813 * Managed pci_enable_device().
815 int pcim_enable_device(struct pci_dev *pdev)
817 struct pci_devres *dr;
820 dr = get_pci_dr(pdev);
823 WARN_ON(!!dr->disable);
825 rc = pci_enable_device(pdev);
827 pdev->is_managed = 1;
834 * pcim_pin_device - Pin managed PCI device
835 * @pdev: PCI device to pin
837 * Pin managed PCI device @pdev. Pinned device won't be disabled on
838 * driver detach. @pdev must have been enabled with
839 * pcim_enable_device().
841 void pcim_pin_device(struct pci_dev *pdev)
843 struct pci_devres *dr;
845 dr = find_pci_dr(pdev);
846 WARN_ON(!dr || !dr->disable);
852 * pcibios_disable_device - disable arch specific PCI resources for device dev
853 * @dev: the PCI device to disable
855 * Disables architecture specific PCI resources for the device. This
856 * is the default implementation. Architecture implementations can
859 void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {}
862 * pci_disable_device - Disable PCI device after use
863 * @dev: PCI device to be disabled
865 * Signal to the system that the PCI device is not in use by the system
866 * anymore. This only involves disabling PCI bus-mastering, if active.
868 * Note we don't actually disable the device until all callers of
869 * pci_device_enable() have called pci_device_disable().
872 pci_disable_device(struct pci_dev *dev)
874 struct pci_devres *dr;
877 dr = find_pci_dr(dev);
881 if (atomic_sub_return(1, &dev->enable_cnt) != 0)
884 pci_read_config_word(dev, PCI_COMMAND, &pci_command);
885 if (pci_command & PCI_COMMAND_MASTER) {
886 pci_command &= ~PCI_COMMAND_MASTER;
887 pci_write_config_word(dev, PCI_COMMAND, pci_command);
889 dev->is_busmaster = 0;
891 pcibios_disable_device(dev);
895 * pci_enable_wake - enable device to generate PME# when suspended
896 * @dev: - PCI device to operate on
897 * @state: - Current state of device.
898 * @enable: - Flag to enable or disable generation
900 * Set the bits in the device's PM Capabilities to generate PME# when
901 * the system is suspended.
903 * -EIO is returned if device doesn't have PM Capabilities.
904 * -EINVAL is returned if device supports it, but can't generate wake events.
905 * 0 if operation is successful.
908 int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
913 /* find PCI PM capability in list */
914 pm = pci_find_capability(dev, PCI_CAP_ID_PM);
916 /* If device doesn't support PM Capabilities, but request is to disable
917 * wake events, it's a nop; otherwise fail */
919 return enable ? -EIO : 0;
921 /* Check device's ability to generate PME# */
922 pci_read_config_word(dev,pm+PCI_PM_PMC,&value);
924 value &= PCI_PM_CAP_PME_MASK;
925 value >>= ffs(PCI_PM_CAP_PME_MASK) - 1; /* First bit of mask */
927 /* Check if it can generate PME# from requested state. */
928 if (!value || !(value & (1 << state)))
929 return enable ? -EINVAL : 0;
931 pci_read_config_word(dev, pm + PCI_PM_CTRL, &value);
933 /* Clear PME_Status by writing 1 to it and enable PME# */
934 value |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE;
937 value &= ~PCI_PM_CTRL_PME_ENABLE;
939 pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
945 pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
953 while (dev->bus->self) {
954 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
955 dev = dev->bus->self;
962 * pci_release_region - Release a PCI bar
963 * @pdev: PCI device whose resources were previously reserved by pci_request_region
964 * @bar: BAR to release
966 * Releases the PCI I/O and memory resources previously reserved by a
967 * successful call to pci_request_region. Call this function only
968 * after all use of the PCI regions has ceased.
970 void pci_release_region(struct pci_dev *pdev, int bar)
972 struct pci_devres *dr;
974 if (pci_resource_len(pdev, bar) == 0)
976 if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
977 release_region(pci_resource_start(pdev, bar),
978 pci_resource_len(pdev, bar));
979 else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
980 release_mem_region(pci_resource_start(pdev, bar),
981 pci_resource_len(pdev, bar));
983 dr = find_pci_dr(pdev);
985 dr->region_mask &= ~(1 << bar);
989 * pci_request_region - Reserved PCI I/O and memory resource
990 * @pdev: PCI device whose resources are to be reserved
991 * @bar: BAR to be reserved
992 * @res_name: Name to be associated with resource.
994 * Mark the PCI region associated with PCI device @pdev BR @bar as
995 * being reserved by owner @res_name. Do not access any
996 * address inside the PCI regions unless this call returns
999 * Returns 0 on success, or %EBUSY on error. A warning
1000 * message is also printed on failure.
1002 int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
1004 struct pci_devres *dr;
1006 if (pci_resource_len(pdev, bar) == 0)
1009 if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
1010 if (!request_region(pci_resource_start(pdev, bar),
1011 pci_resource_len(pdev, bar), res_name))
1014 else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
1015 if (!request_mem_region(pci_resource_start(pdev, bar),
1016 pci_resource_len(pdev, bar), res_name))
1020 dr = find_pci_dr(pdev);
1022 dr->region_mask |= 1 << bar;
1027 printk (KERN_WARNING "PCI: Unable to reserve %s region #%d:%llx@%llx "
1029 pci_resource_flags(pdev, bar) & IORESOURCE_IO ? "I/O" : "mem",
1030 bar + 1, /* PCI BAR # */
1031 (unsigned long long)pci_resource_len(pdev, bar),
1032 (unsigned long long)pci_resource_start(pdev, bar),
1038 * pci_release_selected_regions - Release selected PCI I/O and memory resources
1039 * @pdev: PCI device whose resources were previously reserved
1040 * @bars: Bitmask of BARs to be released
1042 * Release selected PCI I/O and memory resources previously reserved.
1043 * Call this function only after all use of the PCI regions has ceased.
1045 void pci_release_selected_regions(struct pci_dev *pdev, int bars)
1049 for (i = 0; i < 6; i++)
1050 if (bars & (1 << i))
1051 pci_release_region(pdev, i);
1055 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
1056 * @pdev: PCI device whose resources are to be reserved
1057 * @bars: Bitmask of BARs to be requested
1058 * @res_name: Name to be associated with resource
1060 int pci_request_selected_regions(struct pci_dev *pdev, int bars,
1061 const char *res_name)
1065 for (i = 0; i < 6; i++)
1066 if (bars & (1 << i))
1067 if(pci_request_region(pdev, i, res_name))
1073 if (bars & (1 << i))
1074 pci_release_region(pdev, i);
1080 * pci_release_regions - Release reserved PCI I/O and memory resources
1081 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
1083 * Releases all PCI I/O and memory resources previously reserved by a
1084 * successful call to pci_request_regions. Call this function only
1085 * after all use of the PCI regions has ceased.
1088 void pci_release_regions(struct pci_dev *pdev)
1090 pci_release_selected_regions(pdev, (1 << 6) - 1);
1094 * pci_request_regions - Reserved PCI I/O and memory resources
1095 * @pdev: PCI device whose resources are to be reserved
1096 * @res_name: Name to be associated with resource.
1098 * Mark all PCI regions associated with PCI device @pdev as
1099 * being reserved by owner @res_name. Do not access any
1100 * address inside the PCI regions unless this call returns
1103 * Returns 0 on success, or %EBUSY on error. A warning
1104 * message is also printed on failure.
1106 int pci_request_regions(struct pci_dev *pdev, const char *res_name)
1108 return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name);
1112 * pci_set_master - enables bus-mastering for device dev
1113 * @dev: the PCI device to enable
1115 * Enables bus-mastering on the device and calls pcibios_set_master()
1116 * to do the needed arch specific settings.
1119 pci_set_master(struct pci_dev *dev)
1123 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1124 if (! (cmd & PCI_COMMAND_MASTER)) {
1125 pr_debug("PCI: Enabling bus mastering for device %s\n", pci_name(dev));
1126 cmd |= PCI_COMMAND_MASTER;
1127 pci_write_config_word(dev, PCI_COMMAND, cmd);
1129 dev->is_busmaster = 1;
1130 pcibios_set_master(dev);
1133 #ifdef PCI_DISABLE_MWI
1134 int pci_set_mwi(struct pci_dev *dev)
1139 void pci_clear_mwi(struct pci_dev *dev)
1145 #ifndef PCI_CACHE_LINE_BYTES
1146 #define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES
1149 /* This can be overridden by arch code. */
1150 /* Don't forget this is measured in 32-bit words, not bytes */
1151 u8 pci_cache_line_size = PCI_CACHE_LINE_BYTES / 4;
1154 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
1155 * @dev: the PCI device for which MWI is to be enabled
1157 * Helper function for pci_set_mwi.
1158 * Originally copied from drivers/net/acenic.c.
1159 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
1161 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1164 pci_set_cacheline_size(struct pci_dev *dev)
1168 if (!pci_cache_line_size)
1169 return -EINVAL; /* The system doesn't support MWI. */
1171 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
1172 equal to or multiple of the right value. */
1173 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
1174 if (cacheline_size >= pci_cache_line_size &&
1175 (cacheline_size % pci_cache_line_size) == 0)
1178 /* Write the correct value. */
1179 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size);
1181 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
1182 if (cacheline_size == pci_cache_line_size)
1185 printk(KERN_DEBUG "PCI: cache line size of %d is not supported "
1186 "by device %s\n", pci_cache_line_size << 2, pci_name(dev));
1192 * pci_set_mwi - enables memory-write-invalidate PCI transaction
1193 * @dev: the PCI device for which MWI is enabled
1195 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND,
1196 * and then calls @pcibios_set_mwi to do the needed arch specific
1197 * operations or a generic mwi-prep function.
1199 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1202 pci_set_mwi(struct pci_dev *dev)
1207 rc = pci_set_cacheline_size(dev);
1211 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1212 if (! (cmd & PCI_COMMAND_INVALIDATE)) {
1213 pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n", pci_name(dev));
1214 cmd |= PCI_COMMAND_INVALIDATE;
1215 pci_write_config_word(dev, PCI_COMMAND, cmd);
1222 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
1223 * @dev: the PCI device to disable
1225 * Disables PCI Memory-Write-Invalidate transaction on the device
1228 pci_clear_mwi(struct pci_dev *dev)
1232 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1233 if (cmd & PCI_COMMAND_INVALIDATE) {
1234 cmd &= ~PCI_COMMAND_INVALIDATE;
1235 pci_write_config_word(dev, PCI_COMMAND, cmd);
1238 #endif /* ! PCI_DISABLE_MWI */
1241 * pci_intx - enables/disables PCI INTx for device dev
1242 * @pdev: the PCI device to operate on
1243 * @enable: boolean: whether to enable or disable PCI INTx
1245 * Enables/disables PCI INTx for device dev
1248 pci_intx(struct pci_dev *pdev, int enable)
1250 u16 pci_command, new;
1252 pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
1255 new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
1257 new = pci_command | PCI_COMMAND_INTX_DISABLE;
1260 if (new != pci_command) {
1261 struct pci_devres *dr;
1263 pci_write_config_word(pdev, PCI_COMMAND, new);
1265 dr = find_pci_dr(pdev);
1266 if (dr && !dr->restore_intx) {
1267 dr->restore_intx = 1;
1268 dr->orig_intx = !enable;
1274 * pci_msi_off - disables any msi or msix capabilities
1275 * @pdev: the PCI device to operate on
1277 * If you want to use msi see pci_enable_msi and friends.
1278 * This is a lower level primitive that allows us to disable
1279 * msi operation at the device level.
1281 void pci_msi_off(struct pci_dev *dev)
1286 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
1288 pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
1289 control &= ~PCI_MSI_FLAGS_ENABLE;
1290 pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
1292 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1294 pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
1295 control &= ~PCI_MSIX_FLAGS_ENABLE;
1296 pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
1300 #ifndef HAVE_ARCH_PCI_SET_DMA_MASK
1302 * These can be overridden by arch-specific implementations
1305 pci_set_dma_mask(struct pci_dev *dev, u64 mask)
1307 if (!pci_dma_supported(dev, mask))
1310 dev->dma_mask = mask;
1316 pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
1318 if (!pci_dma_supported(dev, mask))
1321 dev->dev.coherent_dma_mask = mask;
1328 * pci_select_bars - Make BAR mask from the type of resource
1329 * @dev: the PCI device for which BAR mask is made
1330 * @flags: resource type mask to be selected
1332 * This helper routine makes bar mask from the type of resource.
1334 int pci_select_bars(struct pci_dev *dev, unsigned long flags)
1337 for (i = 0; i < PCI_NUM_RESOURCES; i++)
1338 if (pci_resource_flags(dev, i) & flags)
1343 static int __devinit pci_init(void)
1345 struct pci_dev *dev = NULL;
1347 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1348 pci_fixup_device(pci_fixup_final, dev);
1353 static int __devinit pci_setup(char *str)
1356 char *k = strchr(str, ',');
1359 if (*str && (str = pcibios_setup(str)) && *str) {
1360 if (!strcmp(str, "nomsi")) {
1362 } else if (!strncmp(str, "cbiosize=", 9)) {
1363 pci_cardbus_io_size = memparse(str + 9, &str);
1364 } else if (!strncmp(str, "cbmemsize=", 10)) {
1365 pci_cardbus_mem_size = memparse(str + 10, &str);
1367 printk(KERN_ERR "PCI: Unknown option `%s'\n",
1375 early_param("pci", pci_setup);
1377 device_initcall(pci_init);
1379 EXPORT_SYMBOL_GPL(pci_restore_bars);
1380 EXPORT_SYMBOL(pci_enable_device_bars);
1381 EXPORT_SYMBOL(pci_enable_device);
1382 EXPORT_SYMBOL(pcim_enable_device);
1383 EXPORT_SYMBOL(pcim_pin_device);
1384 EXPORT_SYMBOL(pci_disable_device);
1385 EXPORT_SYMBOL(pci_find_capability);
1386 EXPORT_SYMBOL(pci_bus_find_capability);
1387 EXPORT_SYMBOL(pci_release_regions);
1388 EXPORT_SYMBOL(pci_request_regions);
1389 EXPORT_SYMBOL(pci_release_region);
1390 EXPORT_SYMBOL(pci_request_region);
1391 EXPORT_SYMBOL(pci_release_selected_regions);
1392 EXPORT_SYMBOL(pci_request_selected_regions);
1393 EXPORT_SYMBOL(pci_set_master);
1394 EXPORT_SYMBOL(pci_set_mwi);
1395 EXPORT_SYMBOL(pci_clear_mwi);
1396 EXPORT_SYMBOL_GPL(pci_intx);
1397 EXPORT_SYMBOL(pci_set_dma_mask);
1398 EXPORT_SYMBOL(pci_set_consistent_dma_mask);
1399 EXPORT_SYMBOL(pci_assign_resource);
1400 EXPORT_SYMBOL(pci_find_parent_resource);
1401 EXPORT_SYMBOL(pci_select_bars);
1403 EXPORT_SYMBOL(pci_set_power_state);
1404 EXPORT_SYMBOL(pci_save_state);
1405 EXPORT_SYMBOL(pci_restore_state);
1406 EXPORT_SYMBOL(pci_enable_wake);