2 * PCI Bus Services, see include/linux/pci.h for further explanation.
4 * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
7 * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz>
10 #include <linux/kernel.h>
11 #include <linux/delay.h>
12 #include <linux/init.h>
13 #include <linux/pci.h>
15 #include <linux/module.h>
16 #include <linux/spinlock.h>
17 #include <linux/string.h>
18 #include <linux/log2.h>
19 #include <linux/pci-aspm.h>
20 #include <linux/pm_wakeup.h>
21 #include <asm/dma.h> /* isa_dma_bridge_buggy */
24 unsigned int pci_pm_d3_delay = 10;
26 #ifdef CONFIG_PCI_DOMAINS
27 int pci_domains_supported = 1;
30 #define DEFAULT_CARDBUS_IO_SIZE (256)
31 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
32 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
33 unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE;
34 unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE;
37 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
38 * @bus: pointer to PCI bus structure to search
40 * Given a PCI bus, returns the highest PCI bus number present in the set
41 * including the given PCI bus and its list of child PCI buses.
43 unsigned char pci_bus_max_busnr(struct pci_bus* bus)
45 struct list_head *tmp;
48 max = bus->subordinate;
49 list_for_each(tmp, &bus->children) {
50 n = pci_bus_max_busnr(pci_bus_b(tmp));
56 EXPORT_SYMBOL_GPL(pci_bus_max_busnr);
60 * pci_max_busnr - returns maximum PCI bus number
62 * Returns the highest PCI bus number present in the system global list of
65 unsigned char __devinit
68 struct pci_bus *bus = NULL;
72 while ((bus = pci_find_next_bus(bus)) != NULL) {
73 n = pci_bus_max_busnr(bus);
82 #define PCI_FIND_CAP_TTL 48
84 static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn,
85 u8 pos, int cap, int *ttl)
90 pci_bus_read_config_byte(bus, devfn, pos, &pos);
94 pci_bus_read_config_byte(bus, devfn, pos + PCI_CAP_LIST_ID,
100 pos += PCI_CAP_LIST_NEXT;
105 static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn,
108 int ttl = PCI_FIND_CAP_TTL;
110 return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl);
113 int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap)
115 return __pci_find_next_cap(dev->bus, dev->devfn,
116 pos + PCI_CAP_LIST_NEXT, cap);
118 EXPORT_SYMBOL_GPL(pci_find_next_capability);
120 static int __pci_bus_find_cap_start(struct pci_bus *bus,
121 unsigned int devfn, u8 hdr_type)
125 pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status);
126 if (!(status & PCI_STATUS_CAP_LIST))
130 case PCI_HEADER_TYPE_NORMAL:
131 case PCI_HEADER_TYPE_BRIDGE:
132 return PCI_CAPABILITY_LIST;
133 case PCI_HEADER_TYPE_CARDBUS:
134 return PCI_CB_CAPABILITY_LIST;
143 * pci_find_capability - query for devices' capabilities
144 * @dev: PCI device to query
145 * @cap: capability code
147 * Tell if a device supports a given PCI capability.
148 * Returns the address of the requested capability structure within the
149 * device's PCI configuration space or 0 in case the device does not
150 * support it. Possible values for @cap:
152 * %PCI_CAP_ID_PM Power Management
153 * %PCI_CAP_ID_AGP Accelerated Graphics Port
154 * %PCI_CAP_ID_VPD Vital Product Data
155 * %PCI_CAP_ID_SLOTID Slot Identification
156 * %PCI_CAP_ID_MSI Message Signalled Interrupts
157 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
158 * %PCI_CAP_ID_PCIX PCI-X
159 * %PCI_CAP_ID_EXP PCI Express
161 int pci_find_capability(struct pci_dev *dev, int cap)
165 pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
167 pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap);
173 * pci_bus_find_capability - query for devices' capabilities
174 * @bus: the PCI bus to query
175 * @devfn: PCI device to query
176 * @cap: capability code
178 * Like pci_find_capability() but works for pci devices that do not have a
179 * pci_dev structure set up yet.
181 * Returns the address of the requested capability structure within the
182 * device's PCI configuration space or 0 in case the device does not
185 int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap)
190 pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type);
192 pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f);
194 pos = __pci_find_next_cap(bus, devfn, pos, cap);
200 * pci_find_ext_capability - Find an extended capability
201 * @dev: PCI device to query
202 * @cap: capability code
204 * Returns the address of the requested extended capability structure
205 * within the device's PCI configuration space or 0 if the device does
206 * not support it. Possible values for @cap:
208 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
209 * %PCI_EXT_CAP_ID_VC Virtual Channel
210 * %PCI_EXT_CAP_ID_DSN Device Serial Number
211 * %PCI_EXT_CAP_ID_PWR Power Budgeting
213 int pci_find_ext_capability(struct pci_dev *dev, int cap)
216 int ttl = 480; /* 3840 bytes, minimum 8 bytes per capability */
219 if (dev->cfg_size <= 256)
222 if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
226 * If we have no capabilities, this is indicated by cap ID,
227 * cap version and next pointer all being 0.
233 if (PCI_EXT_CAP_ID(header) == cap)
236 pos = PCI_EXT_CAP_NEXT(header);
240 if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
246 EXPORT_SYMBOL_GPL(pci_find_ext_capability);
248 static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap)
250 int rc, ttl = PCI_FIND_CAP_TTL;
253 if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST)
254 mask = HT_3BIT_CAP_MASK;
256 mask = HT_5BIT_CAP_MASK;
258 pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos,
259 PCI_CAP_ID_HT, &ttl);
261 rc = pci_read_config_byte(dev, pos + 3, &cap);
262 if (rc != PCIBIOS_SUCCESSFUL)
265 if ((cap & mask) == ht_cap)
268 pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn,
269 pos + PCI_CAP_LIST_NEXT,
270 PCI_CAP_ID_HT, &ttl);
276 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
277 * @dev: PCI device to query
278 * @pos: Position from which to continue searching
279 * @ht_cap: Hypertransport capability code
281 * To be used in conjunction with pci_find_ht_capability() to search for
282 * all capabilities matching @ht_cap. @pos should always be a value returned
283 * from pci_find_ht_capability().
285 * NB. To be 100% safe against broken PCI devices, the caller should take
286 * steps to avoid an infinite loop.
288 int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap)
290 return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap);
292 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability);
295 * pci_find_ht_capability - query a device's Hypertransport capabilities
296 * @dev: PCI device to query
297 * @ht_cap: Hypertransport capability code
299 * Tell if a device supports a given Hypertransport capability.
300 * Returns an address within the device's PCI configuration space
301 * or 0 in case the device does not support the request capability.
302 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
303 * which has a Hypertransport capability matching @ht_cap.
305 int pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
309 pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
311 pos = __pci_find_next_ht_cap(dev, pos, ht_cap);
315 EXPORT_SYMBOL_GPL(pci_find_ht_capability);
318 * pci_find_parent_resource - return resource region of parent bus of given region
319 * @dev: PCI device structure contains resources to be searched
320 * @res: child resource record for which parent is sought
322 * For given resource region of given device, return the resource
323 * region of parent bus the given region is contained in or where
324 * it should be allocated from.
327 pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
329 const struct pci_bus *bus = dev->bus;
331 struct resource *best = NULL;
333 for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
334 struct resource *r = bus->resource[i];
337 if (res->start && !(res->start >= r->start && res->end <= r->end))
338 continue; /* Not contained */
339 if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM))
340 continue; /* Wrong type */
341 if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH))
342 return r; /* Exact match */
343 if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH))
344 best = r; /* Approximating prefetchable by non-prefetchable */
350 * pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
351 * @dev: PCI device to have its BARs restored
353 * Restore the BAR values for a given device, so as to make it
354 * accessible by its driver.
357 pci_restore_bars(struct pci_dev *dev)
361 switch (dev->hdr_type) {
362 case PCI_HEADER_TYPE_NORMAL:
365 case PCI_HEADER_TYPE_BRIDGE:
368 case PCI_HEADER_TYPE_CARDBUS:
372 /* Should never get here, but just in case... */
376 for (i = 0; i < numres; i ++)
377 pci_update_resource(dev, &dev->resource[i], i);
380 static struct pci_platform_pm_ops *pci_platform_pm;
382 int pci_set_platform_pm(struct pci_platform_pm_ops *ops)
384 if (!ops->is_manageable || !ops->set_state || !ops->choose_state
385 || !ops->sleep_wake || !ops->can_wakeup)
387 pci_platform_pm = ops;
391 static inline bool platform_pci_power_manageable(struct pci_dev *dev)
393 return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false;
396 static inline int platform_pci_set_power_state(struct pci_dev *dev,
399 return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS;
402 static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev)
404 return pci_platform_pm ?
405 pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR;
408 static inline bool platform_pci_can_wakeup(struct pci_dev *dev)
410 return pci_platform_pm ? pci_platform_pm->can_wakeup(dev) : false;
413 static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable)
415 return pci_platform_pm ?
416 pci_platform_pm->sleep_wake(dev, enable) : -ENODEV;
420 * pci_raw_set_power_state - Use PCI PM registers to set the power state of
422 * @dev: PCI device to handle.
423 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
426 * -EINVAL if the requested state is invalid.
427 * -EIO if device does not support PCI PM or its PM capabilities register has a
428 * wrong version, or device doesn't support the requested state.
429 * 0 if device already is in the requested state.
430 * 0 if device's power state has been successfully changed.
433 pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
436 bool need_restore = false;
441 if (state < PCI_D0 || state > PCI_D3hot)
444 /* Validate current state:
445 * Can enter D0 from any state, but if we can only go deeper
446 * to sleep if we're already in a low power state
448 if (dev->current_state == state) {
449 /* we're already there */
451 } else if (state != PCI_D0 && dev->current_state <= PCI_D3cold
452 && dev->current_state > state) {
453 dev_err(&dev->dev, "invalid power transition "
454 "(from state %d to %d)\n", dev->current_state, state);
458 /* check if this device supports the desired state */
459 if ((state == PCI_D1 && !dev->d1_support)
460 || (state == PCI_D2 && !dev->d2_support))
463 pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
465 /* If we're (effectively) in D3, force entire word to 0.
466 * This doesn't affect PME_Status, disables PME_En, and
467 * sets PowerState to 0.
469 switch (dev->current_state) {
473 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
476 case PCI_UNKNOWN: /* Boot-up */
477 if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot
478 && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET))
480 /* Fall-through: force to D0 */
486 /* enter specified state */
487 pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
489 /* Mandatory power management transition delays */
490 /* see PCI PM 1.1 5.6.1 table 18 */
491 if (state == PCI_D3hot || dev->current_state == PCI_D3hot)
492 msleep(pci_pm_d3_delay);
493 else if (state == PCI_D2 || dev->current_state == PCI_D2)
496 dev->current_state = state;
498 /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
499 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
500 * from D3hot to D0 _may_ perform an internal reset, thereby
501 * going to "D0 Uninitialized" rather than "D0 Initialized".
502 * For example, at least some versions of the 3c905B and the
503 * 3c556B exhibit this behaviour.
505 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
506 * devices in a D3hot state at boot. Consequently, we need to
507 * restore at least the BARs so that the device will be
508 * accessible to its driver.
511 pci_restore_bars(dev);
514 pcie_aspm_pm_state_change(dev->bus->self);
520 * pci_update_current_state - Read PCI power state of given device from its
521 * PCI PM registers and cache it
522 * @dev: PCI device to handle.
524 static void pci_update_current_state(struct pci_dev *dev)
529 pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
530 dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
535 * pci_set_power_state - Set the power state of a PCI device
536 * @dev: PCI device to handle.
537 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
539 * Transition a device to a new power state, using the platform formware and/or
540 * the device's PCI PM registers.
543 * -EINVAL if the requested state is invalid.
544 * -EIO if device does not support PCI PM or its PM capabilities register has a
545 * wrong version, or device doesn't support the requested state.
546 * 0 if device already is in the requested state.
547 * 0 if device's power state has been successfully changed.
549 int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
553 /* bound the state we're entering */
554 if (state > PCI_D3hot)
556 else if (state < PCI_D0)
558 else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev))
560 * If the device or the parent bridge do not support PCI PM,
561 * ignore the request if we're doing anything other than putting
562 * it into D0 (which would only happen on boot).
566 if (state == PCI_D0 && platform_pci_power_manageable(dev)) {
568 * Allow the platform to change the state, for example via ACPI
569 * _PR0, _PS0 and some such, but do not trust it.
571 int ret = platform_pci_set_power_state(dev, PCI_D0);
573 pci_update_current_state(dev);
575 /* This device is quirked not to be put into D3, so
576 don't put it in D3 */
577 if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
580 error = pci_raw_set_power_state(dev, state);
582 if (state > PCI_D0 && platform_pci_power_manageable(dev)) {
583 /* Allow the platform to finalize the transition */
584 int ret = platform_pci_set_power_state(dev, state);
586 pci_update_current_state(dev);
595 * pci_choose_state - Choose the power state of a PCI device
596 * @dev: PCI device to be suspended
597 * @state: target sleep state for the whole system. This is the value
598 * that is passed to suspend() function.
600 * Returns PCI power state suitable for given device and given system
604 pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
608 if (!pci_find_capability(dev, PCI_CAP_ID_PM))
611 ret = platform_pci_choose_state(dev);
612 if (ret != PCI_POWER_ERROR)
615 switch (state.event) {
618 case PM_EVENT_FREEZE:
619 case PM_EVENT_PRETHAW:
620 /* REVISIT both freeze and pre-thaw "should" use D0 */
621 case PM_EVENT_SUSPEND:
622 case PM_EVENT_HIBERNATE:
625 dev_info(&dev->dev, "unrecognized suspend event %d\n",
632 EXPORT_SYMBOL(pci_choose_state);
634 static int pci_save_pcie_state(struct pci_dev *dev)
637 struct pci_cap_saved_state *save_state;
641 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
645 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
647 save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL);
651 dev_err(&dev->dev, "out of memory in pci_save_pcie_state\n");
654 cap = (u16 *)&save_state->data[0];
656 pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
657 pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
658 pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
659 pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
660 save_state->cap_nr = PCI_CAP_ID_EXP;
662 pci_add_saved_cap(dev, save_state);
666 static void pci_restore_pcie_state(struct pci_dev *dev)
669 struct pci_cap_saved_state *save_state;
672 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
673 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
674 if (!save_state || pos <= 0)
676 cap = (u16 *)&save_state->data[0];
678 pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
679 pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
680 pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
681 pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
685 static int pci_save_pcix_state(struct pci_dev *dev)
688 struct pci_cap_saved_state *save_state;
692 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
696 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
698 save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
702 dev_err(&dev->dev, "out of memory in pci_save_pcie_state\n");
705 cap = (u16 *)&save_state->data[0];
707 pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
708 save_state->cap_nr = PCI_CAP_ID_PCIX;
710 pci_add_saved_cap(dev, save_state);
714 static void pci_restore_pcix_state(struct pci_dev *dev)
717 struct pci_cap_saved_state *save_state;
720 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
721 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
722 if (!save_state || pos <= 0)
724 cap = (u16 *)&save_state->data[0];
726 pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
731 * pci_save_state - save the PCI configuration space of a device before suspending
732 * @dev: - PCI device that we're dealing with
735 pci_save_state(struct pci_dev *dev)
738 /* XXX: 100% dword access ok here? */
739 for (i = 0; i < 16; i++)
740 pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]);
741 if ((i = pci_save_pcie_state(dev)) != 0)
743 if ((i = pci_save_pcix_state(dev)) != 0)
749 * pci_restore_state - Restore the saved state of a PCI device
750 * @dev: - PCI device that we're dealing with
753 pci_restore_state(struct pci_dev *dev)
758 /* PCI Express register must be restored first */
759 pci_restore_pcie_state(dev);
762 * The Base Address register should be programmed before the command
765 for (i = 15; i >= 0; i--) {
766 pci_read_config_dword(dev, i * 4, &val);
767 if (val != dev->saved_config_space[i]) {
768 dev_printk(KERN_DEBUG, &dev->dev, "restoring config "
769 "space at offset %#x (was %#x, writing %#x)\n",
770 i, val, (int)dev->saved_config_space[i]);
771 pci_write_config_dword(dev,i * 4,
772 dev->saved_config_space[i]);
775 pci_restore_pcix_state(dev);
776 pci_restore_msi_state(dev);
781 static int do_pci_enable_device(struct pci_dev *dev, int bars)
785 err = pci_set_power_state(dev, PCI_D0);
786 if (err < 0 && err != -EIO)
788 err = pcibios_enable_device(dev, bars);
791 pci_fixup_device(pci_fixup_enable, dev);
797 * pci_reenable_device - Resume abandoned device
798 * @dev: PCI device to be resumed
800 * Note this function is a backend of pci_default_resume and is not supposed
801 * to be called by normal code, write proper resume handler and use it instead.
803 int pci_reenable_device(struct pci_dev *dev)
805 if (atomic_read(&dev->enable_cnt))
806 return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
810 static int __pci_enable_device_flags(struct pci_dev *dev,
811 resource_size_t flags)
816 if (atomic_add_return(1, &dev->enable_cnt) > 1)
817 return 0; /* already enabled */
819 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
820 if (dev->resource[i].flags & flags)
823 err = do_pci_enable_device(dev, bars);
825 atomic_dec(&dev->enable_cnt);
830 * pci_enable_device_io - Initialize a device for use with IO space
831 * @dev: PCI device to be initialized
833 * Initialize device before it's used by a driver. Ask low-level code
834 * to enable I/O resources. Wake up the device if it was suspended.
835 * Beware, this function can fail.
837 int pci_enable_device_io(struct pci_dev *dev)
839 return __pci_enable_device_flags(dev, IORESOURCE_IO);
843 * pci_enable_device_mem - Initialize a device for use with Memory space
844 * @dev: PCI device to be initialized
846 * Initialize device before it's used by a driver. Ask low-level code
847 * to enable Memory resources. Wake up the device if it was suspended.
848 * Beware, this function can fail.
850 int pci_enable_device_mem(struct pci_dev *dev)
852 return __pci_enable_device_flags(dev, IORESOURCE_MEM);
856 * pci_enable_device - Initialize device before it's used by a driver.
857 * @dev: PCI device to be initialized
859 * Initialize device before it's used by a driver. Ask low-level code
860 * to enable I/O and memory. Wake up the device if it was suspended.
861 * Beware, this function can fail.
863 * Note we don't actually enable the device many times if we call
864 * this function repeatedly (we just increment the count).
866 int pci_enable_device(struct pci_dev *dev)
868 return __pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO);
872 * Managed PCI resources. This manages device on/off, intx/msi/msix
873 * on/off and BAR regions. pci_dev itself records msi/msix status, so
874 * there's no need to track it separately. pci_devres is initialized
875 * when a device is enabled using managed PCI device enable interface.
878 unsigned int enabled:1;
879 unsigned int pinned:1;
880 unsigned int orig_intx:1;
881 unsigned int restore_intx:1;
885 static void pcim_release(struct device *gendev, void *res)
887 struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
888 struct pci_devres *this = res;
891 if (dev->msi_enabled)
892 pci_disable_msi(dev);
893 if (dev->msix_enabled)
894 pci_disable_msix(dev);
896 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
897 if (this->region_mask & (1 << i))
898 pci_release_region(dev, i);
900 if (this->restore_intx)
901 pci_intx(dev, this->orig_intx);
903 if (this->enabled && !this->pinned)
904 pci_disable_device(dev);
907 static struct pci_devres * get_pci_dr(struct pci_dev *pdev)
909 struct pci_devres *dr, *new_dr;
911 dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
915 new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
918 return devres_get(&pdev->dev, new_dr, NULL, NULL);
921 static struct pci_devres * find_pci_dr(struct pci_dev *pdev)
923 if (pci_is_managed(pdev))
924 return devres_find(&pdev->dev, pcim_release, NULL, NULL);
929 * pcim_enable_device - Managed pci_enable_device()
930 * @pdev: PCI device to be initialized
932 * Managed pci_enable_device().
934 int pcim_enable_device(struct pci_dev *pdev)
936 struct pci_devres *dr;
939 dr = get_pci_dr(pdev);
945 rc = pci_enable_device(pdev);
947 pdev->is_managed = 1;
954 * pcim_pin_device - Pin managed PCI device
955 * @pdev: PCI device to pin
957 * Pin managed PCI device @pdev. Pinned device won't be disabled on
958 * driver detach. @pdev must have been enabled with
959 * pcim_enable_device().
961 void pcim_pin_device(struct pci_dev *pdev)
963 struct pci_devres *dr;
965 dr = find_pci_dr(pdev);
966 WARN_ON(!dr || !dr->enabled);
972 * pcibios_disable_device - disable arch specific PCI resources for device dev
973 * @dev: the PCI device to disable
975 * Disables architecture specific PCI resources for the device. This
976 * is the default implementation. Architecture implementations can
979 void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {}
982 * pci_disable_device - Disable PCI device after use
983 * @dev: PCI device to be disabled
985 * Signal to the system that the PCI device is not in use by the system
986 * anymore. This only involves disabling PCI bus-mastering, if active.
988 * Note we don't actually disable the device until all callers of
989 * pci_device_enable() have called pci_device_disable().
992 pci_disable_device(struct pci_dev *dev)
994 struct pci_devres *dr;
997 dr = find_pci_dr(dev);
1001 if (atomic_sub_return(1, &dev->enable_cnt) != 0)
1004 pci_read_config_word(dev, PCI_COMMAND, &pci_command);
1005 if (pci_command & PCI_COMMAND_MASTER) {
1006 pci_command &= ~PCI_COMMAND_MASTER;
1007 pci_write_config_word(dev, PCI_COMMAND, pci_command);
1009 dev->is_busmaster = 0;
1011 pcibios_disable_device(dev);
1015 * pcibios_set_pcie_reset_state - set reset state for device dev
1016 * @dev: the PCI-E device reset
1017 * @state: Reset state to enter into
1020 * Sets the PCI-E reset state for the device. This is the default
1021 * implementation. Architecture implementations can override this.
1023 int __attribute__ ((weak)) pcibios_set_pcie_reset_state(struct pci_dev *dev,
1024 enum pcie_reset_state state)
1030 * pci_set_pcie_reset_state - set reset state for device dev
1031 * @dev: the PCI-E device reset
1032 * @state: Reset state to enter into
1035 * Sets the PCI reset state for the device.
1037 int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
1039 return pcibios_set_pcie_reset_state(dev, state);
1043 * pci_pme_capable - check the capability of PCI device to generate PME#
1044 * @dev: PCI device to handle.
1045 * @state: PCI state from which device will issue PME#.
1047 bool pci_pme_capable(struct pci_dev *dev, pci_power_t state)
1052 return !!(dev->pme_support & (1 << state));
1056 * pci_pme_active - enable or disable PCI device's PME# function
1057 * @dev: PCI device to handle.
1058 * @enable: 'true' to enable PME# generation; 'false' to disable it.
1060 * The caller must verify that the device is capable of generating PME# before
1061 * calling this function with @enable equal to 'true'.
1063 static void pci_pme_active(struct pci_dev *dev, bool enable)
1070 pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
1071 /* Clear PME_Status by writing 1 to it and enable PME# */
1072 pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE;
1074 pmcsr &= ~PCI_PM_CTRL_PME_ENABLE;
1076 pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
1078 dev_printk(KERN_INFO, &dev->dev, "PME# %s\n",
1079 enable ? "enabled" : "disabled");
1083 * pci_enable_wake - enable PCI device as wakeup event source
1084 * @dev: PCI device affected
1085 * @state: PCI state from which device will issue wakeup events
1086 * @enable: True to enable event generation; false to disable
1088 * This enables the device as a wakeup event source, or disables it.
1089 * When such events involves platform-specific hooks, those hooks are
1090 * called automatically by this routine.
1092 * Devices with legacy power management (no standard PCI PM capabilities)
1093 * always require such platform hooks.
1096 * 0 is returned on success
1097 * -EINVAL is returned if device is not supposed to wake up the system
1098 * Error code depending on the platform is returned if both the platform and
1099 * the native mechanism fail to enable the generation of wake-up events
1101 int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
1104 bool pme_done = false;
1106 if (!device_may_wakeup(&dev->dev))
1110 * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
1111 * Anderson we should be doing PME# wake enable followed by ACPI wake
1112 * enable. To disable wake-up we call the platform first, for symmetry.
1115 if (!enable && platform_pci_can_wakeup(dev))
1116 error = platform_pci_sleep_wake(dev, false);
1118 if (!enable || pci_pme_capable(dev, state)) {
1119 pci_pme_active(dev, enable);
1123 if (enable && platform_pci_can_wakeup(dev))
1124 error = platform_pci_sleep_wake(dev, true);
1126 return pme_done ? 0 : error;
1130 * pci_target_state - find an appropriate low power state for a given PCI dev
1133 * Use underlying platform code to find a supported low power state for @dev.
1134 * If the platform can't manage @dev, return the deepest state from which it
1135 * can generate wake events, based on any available PME info.
1137 pci_power_t pci_target_state(struct pci_dev *dev)
1139 pci_power_t target_state = PCI_D3hot;
1141 if (platform_pci_power_manageable(dev)) {
1143 * Call the platform to choose the target state of the device
1144 * and enable wake-up from this state if supported.
1146 pci_power_t state = platform_pci_choose_state(dev);
1149 case PCI_POWER_ERROR:
1154 if (pci_no_d1d2(dev))
1157 target_state = state;
1159 } else if (device_may_wakeup(&dev->dev)) {
1161 * Find the deepest state from which the device can generate
1162 * wake-up events, make it the target state and enable device
1166 return PCI_POWER_ERROR;
1168 if (dev->pme_support) {
1170 && !(dev->pme_support & (1 << target_state)))
1175 return target_state;
1179 * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
1180 * @dev: Device to handle.
1182 * Choose the power state appropriate for the device depending on whether
1183 * it can wake up the system and/or is power manageable by the platform
1184 * (PCI_D3hot is the default) and put the device into that state.
1186 int pci_prepare_to_sleep(struct pci_dev *dev)
1188 pci_power_t target_state = pci_target_state(dev);
1191 if (target_state == PCI_POWER_ERROR)
1194 pci_enable_wake(dev, target_state, true);
1196 error = pci_set_power_state(dev, target_state);
1199 pci_enable_wake(dev, target_state, false);
1205 * pci_back_from_sleep - turn PCI device on during system-wide transition into working state
1206 * @dev: Device to handle.
1208 * Disable device's sytem wake-up capability and put it into D0.
1210 int pci_back_from_sleep(struct pci_dev *dev)
1212 pci_enable_wake(dev, PCI_D0, false);
1213 return pci_set_power_state(dev, PCI_D0);
1217 * pci_pm_init - Initialize PM functions of given PCI device
1218 * @dev: PCI device to handle.
1220 void pci_pm_init(struct pci_dev *dev)
1227 /* find PCI PM capability in list */
1228 pm = pci_find_capability(dev, PCI_CAP_ID_PM);
1231 /* Check device's ability to generate PME# */
1232 pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc);
1234 if ((pmc & PCI_PM_CAP_VER_MASK) > 3) {
1235 dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n",
1236 pmc & PCI_PM_CAP_VER_MASK);
1242 dev->d1_support = false;
1243 dev->d2_support = false;
1244 if (!pci_no_d1d2(dev)) {
1245 if (pmc & PCI_PM_CAP_D1) {
1246 dev_printk(KERN_DEBUG, &dev->dev, "supports D1\n");
1247 dev->d1_support = true;
1249 if (pmc & PCI_PM_CAP_D2) {
1250 dev_printk(KERN_DEBUG, &dev->dev, "supports D2\n");
1251 dev->d2_support = true;
1255 pmc &= PCI_PM_CAP_PME_MASK;
1257 dev_printk(KERN_INFO, &dev->dev,
1258 "PME# supported from%s%s%s%s%s\n",
1259 (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "",
1260 (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "",
1261 (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "",
1262 (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "",
1263 (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : "");
1264 dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT;
1266 * Make device's PM flags reflect the wake-up capability, but
1267 * let the user space enable it to wake up the system as needed.
1269 device_set_wakeup_capable(&dev->dev, true);
1270 device_set_wakeup_enable(&dev->dev, false);
1271 /* Disable the PME# generation functionality */
1272 pci_pme_active(dev, false);
1274 dev->pme_support = 0;
1279 pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
1287 while (dev->bus->self) {
1288 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1289 dev = dev->bus->self;
1296 * pci_release_region - Release a PCI bar
1297 * @pdev: PCI device whose resources were previously reserved by pci_request_region
1298 * @bar: BAR to release
1300 * Releases the PCI I/O and memory resources previously reserved by a
1301 * successful call to pci_request_region. Call this function only
1302 * after all use of the PCI regions has ceased.
1304 void pci_release_region(struct pci_dev *pdev, int bar)
1306 struct pci_devres *dr;
1308 if (pci_resource_len(pdev, bar) == 0)
1310 if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
1311 release_region(pci_resource_start(pdev, bar),
1312 pci_resource_len(pdev, bar));
1313 else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
1314 release_mem_region(pci_resource_start(pdev, bar),
1315 pci_resource_len(pdev, bar));
1317 dr = find_pci_dr(pdev);
1319 dr->region_mask &= ~(1 << bar);
1323 * pci_request_region - Reserved PCI I/O and memory resource
1324 * @pdev: PCI device whose resources are to be reserved
1325 * @bar: BAR to be reserved
1326 * @res_name: Name to be associated with resource.
1328 * Mark the PCI region associated with PCI device @pdev BR @bar as
1329 * being reserved by owner @res_name. Do not access any
1330 * address inside the PCI regions unless this call returns
1333 * Returns 0 on success, or %EBUSY on error. A warning
1334 * message is also printed on failure.
1336 int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
1338 struct pci_devres *dr;
1340 if (pci_resource_len(pdev, bar) == 0)
1343 if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
1344 if (!request_region(pci_resource_start(pdev, bar),
1345 pci_resource_len(pdev, bar), res_name))
1348 else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
1349 if (!request_mem_region(pci_resource_start(pdev, bar),
1350 pci_resource_len(pdev, bar), res_name))
1354 dr = find_pci_dr(pdev);
1356 dr->region_mask |= 1 << bar;
1361 dev_warn(&pdev->dev, "BAR %d: can't reserve %s region [%#llx-%#llx]\n",
1363 pci_resource_flags(pdev, bar) & IORESOURCE_IO ? "I/O" : "mem",
1364 (unsigned long long)pci_resource_start(pdev, bar),
1365 (unsigned long long)pci_resource_end(pdev, bar));
1370 * pci_release_selected_regions - Release selected PCI I/O and memory resources
1371 * @pdev: PCI device whose resources were previously reserved
1372 * @bars: Bitmask of BARs to be released
1374 * Release selected PCI I/O and memory resources previously reserved.
1375 * Call this function only after all use of the PCI regions has ceased.
1377 void pci_release_selected_regions(struct pci_dev *pdev, int bars)
1381 for (i = 0; i < 6; i++)
1382 if (bars & (1 << i))
1383 pci_release_region(pdev, i);
1387 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
1388 * @pdev: PCI device whose resources are to be reserved
1389 * @bars: Bitmask of BARs to be requested
1390 * @res_name: Name to be associated with resource
1392 int pci_request_selected_regions(struct pci_dev *pdev, int bars,
1393 const char *res_name)
1397 for (i = 0; i < 6; i++)
1398 if (bars & (1 << i))
1399 if(pci_request_region(pdev, i, res_name))
1405 if (bars & (1 << i))
1406 pci_release_region(pdev, i);
1412 * pci_release_regions - Release reserved PCI I/O and memory resources
1413 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
1415 * Releases all PCI I/O and memory resources previously reserved by a
1416 * successful call to pci_request_regions. Call this function only
1417 * after all use of the PCI regions has ceased.
1420 void pci_release_regions(struct pci_dev *pdev)
1422 pci_release_selected_regions(pdev, (1 << 6) - 1);
1426 * pci_request_regions - Reserved PCI I/O and memory resources
1427 * @pdev: PCI device whose resources are to be reserved
1428 * @res_name: Name to be associated with resource.
1430 * Mark all PCI regions associated with PCI device @pdev as
1431 * being reserved by owner @res_name. Do not access any
1432 * address inside the PCI regions unless this call returns
1435 * Returns 0 on success, or %EBUSY on error. A warning
1436 * message is also printed on failure.
1438 int pci_request_regions(struct pci_dev *pdev, const char *res_name)
1440 return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name);
1444 * pci_set_master - enables bus-mastering for device dev
1445 * @dev: the PCI device to enable
1447 * Enables bus-mastering on the device and calls pcibios_set_master()
1448 * to do the needed arch specific settings.
1451 pci_set_master(struct pci_dev *dev)
1455 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1456 if (! (cmd & PCI_COMMAND_MASTER)) {
1457 dev_dbg(&dev->dev, "enabling bus mastering\n");
1458 cmd |= PCI_COMMAND_MASTER;
1459 pci_write_config_word(dev, PCI_COMMAND, cmd);
1461 dev->is_busmaster = 1;
1462 pcibios_set_master(dev);
1465 #ifdef PCI_DISABLE_MWI
1466 int pci_set_mwi(struct pci_dev *dev)
1471 int pci_try_set_mwi(struct pci_dev *dev)
1476 void pci_clear_mwi(struct pci_dev *dev)
1482 #ifndef PCI_CACHE_LINE_BYTES
1483 #define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES
1486 /* This can be overridden by arch code. */
1487 /* Don't forget this is measured in 32-bit words, not bytes */
1488 u8 pci_cache_line_size = PCI_CACHE_LINE_BYTES / 4;
1491 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
1492 * @dev: the PCI device for which MWI is to be enabled
1494 * Helper function for pci_set_mwi.
1495 * Originally copied from drivers/net/acenic.c.
1496 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
1498 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1501 pci_set_cacheline_size(struct pci_dev *dev)
1505 if (!pci_cache_line_size)
1506 return -EINVAL; /* The system doesn't support MWI. */
1508 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
1509 equal to or multiple of the right value. */
1510 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
1511 if (cacheline_size >= pci_cache_line_size &&
1512 (cacheline_size % pci_cache_line_size) == 0)
1515 /* Write the correct value. */
1516 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size);
1518 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
1519 if (cacheline_size == pci_cache_line_size)
1522 dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not "
1523 "supported\n", pci_cache_line_size << 2);
1529 * pci_set_mwi - enables memory-write-invalidate PCI transaction
1530 * @dev: the PCI device for which MWI is enabled
1532 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
1534 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1537 pci_set_mwi(struct pci_dev *dev)
1542 rc = pci_set_cacheline_size(dev);
1546 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1547 if (! (cmd & PCI_COMMAND_INVALIDATE)) {
1548 dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n");
1549 cmd |= PCI_COMMAND_INVALIDATE;
1550 pci_write_config_word(dev, PCI_COMMAND, cmd);
1557 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
1558 * @dev: the PCI device for which MWI is enabled
1560 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
1561 * Callers are not required to check the return value.
1563 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1565 int pci_try_set_mwi(struct pci_dev *dev)
1567 int rc = pci_set_mwi(dev);
1572 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
1573 * @dev: the PCI device to disable
1575 * Disables PCI Memory-Write-Invalidate transaction on the device
1578 pci_clear_mwi(struct pci_dev *dev)
1582 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1583 if (cmd & PCI_COMMAND_INVALIDATE) {
1584 cmd &= ~PCI_COMMAND_INVALIDATE;
1585 pci_write_config_word(dev, PCI_COMMAND, cmd);
1588 #endif /* ! PCI_DISABLE_MWI */
1591 * pci_intx - enables/disables PCI INTx for device dev
1592 * @pdev: the PCI device to operate on
1593 * @enable: boolean: whether to enable or disable PCI INTx
1595 * Enables/disables PCI INTx for device dev
1598 pci_intx(struct pci_dev *pdev, int enable)
1600 u16 pci_command, new;
1602 pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
1605 new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
1607 new = pci_command | PCI_COMMAND_INTX_DISABLE;
1610 if (new != pci_command) {
1611 struct pci_devres *dr;
1613 pci_write_config_word(pdev, PCI_COMMAND, new);
1615 dr = find_pci_dr(pdev);
1616 if (dr && !dr->restore_intx) {
1617 dr->restore_intx = 1;
1618 dr->orig_intx = !enable;
1624 * pci_msi_off - disables any msi or msix capabilities
1625 * @dev: the PCI device to operate on
1627 * If you want to use msi see pci_enable_msi and friends.
1628 * This is a lower level primitive that allows us to disable
1629 * msi operation at the device level.
1631 void pci_msi_off(struct pci_dev *dev)
1636 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
1638 pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
1639 control &= ~PCI_MSI_FLAGS_ENABLE;
1640 pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
1642 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1644 pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
1645 control &= ~PCI_MSIX_FLAGS_ENABLE;
1646 pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
1650 #ifndef HAVE_ARCH_PCI_SET_DMA_MASK
1652 * These can be overridden by arch-specific implementations
1655 pci_set_dma_mask(struct pci_dev *dev, u64 mask)
1657 if (!pci_dma_supported(dev, mask))
1660 dev->dma_mask = mask;
1666 pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
1668 if (!pci_dma_supported(dev, mask))
1671 dev->dev.coherent_dma_mask = mask;
1677 #ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE
1678 int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size)
1680 return dma_set_max_seg_size(&dev->dev, size);
1682 EXPORT_SYMBOL(pci_set_dma_max_seg_size);
1685 #ifndef HAVE_ARCH_PCI_SET_DMA_SEGMENT_BOUNDARY
1686 int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask)
1688 return dma_set_seg_boundary(&dev->dev, mask);
1690 EXPORT_SYMBOL(pci_set_dma_seg_boundary);
1694 * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
1695 * @dev: PCI device to query
1697 * Returns mmrbc: maximum designed memory read count in bytes
1698 * or appropriate error value.
1700 int pcix_get_max_mmrbc(struct pci_dev *dev)
1705 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1709 err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat);
1713 return (stat & PCI_X_STATUS_MAX_READ) >> 12;
1715 EXPORT_SYMBOL(pcix_get_max_mmrbc);
1718 * pcix_get_mmrbc - get PCI-X maximum memory read byte count
1719 * @dev: PCI device to query
1721 * Returns mmrbc: maximum memory read count in bytes
1722 * or appropriate error value.
1724 int pcix_get_mmrbc(struct pci_dev *dev)
1729 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1733 ret = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd);
1735 ret = 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2);
1739 EXPORT_SYMBOL(pcix_get_mmrbc);
1742 * pcix_set_mmrbc - set PCI-X maximum memory read byte count
1743 * @dev: PCI device to query
1744 * @mmrbc: maximum memory read count in bytes
1745 * valid values are 512, 1024, 2048, 4096
1747 * If possible sets maximum memory read byte count, some bridges have erratas
1748 * that prevent this.
1750 int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc)
1752 int cap, err = -EINVAL;
1753 u32 stat, cmd, v, o;
1755 if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc))
1758 v = ffs(mmrbc) - 10;
1760 cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1764 err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat);
1768 if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21)
1771 err = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd);
1775 o = (cmd & PCI_X_CMD_MAX_READ) >> 2;
1777 if (v > o && dev->bus &&
1778 (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC))
1781 cmd &= ~PCI_X_CMD_MAX_READ;
1783 err = pci_write_config_dword(dev, cap + PCI_X_CMD, cmd);
1788 EXPORT_SYMBOL(pcix_set_mmrbc);
1791 * pcie_get_readrq - get PCI Express read request size
1792 * @dev: PCI device to query
1794 * Returns maximum memory read request in bytes
1795 * or appropriate error value.
1797 int pcie_get_readrq(struct pci_dev *dev)
1802 cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
1806 ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
1808 ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12);
1812 EXPORT_SYMBOL(pcie_get_readrq);
1815 * pcie_set_readrq - set PCI Express maximum memory read request
1816 * @dev: PCI device to query
1817 * @rq: maximum memory read count in bytes
1818 * valid values are 128, 256, 512, 1024, 2048, 4096
1820 * If possible sets maximum read byte count
1822 int pcie_set_readrq(struct pci_dev *dev, int rq)
1824 int cap, err = -EINVAL;
1827 if (rq < 128 || rq > 4096 || !is_power_of_2(rq))
1830 v = (ffs(rq) - 8) << 12;
1832 cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
1836 err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
1840 if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) {
1841 ctl &= ~PCI_EXP_DEVCTL_READRQ;
1843 err = pci_write_config_dword(dev, cap + PCI_EXP_DEVCTL, ctl);
1849 EXPORT_SYMBOL(pcie_set_readrq);
1852 * pci_select_bars - Make BAR mask from the type of resource
1853 * @dev: the PCI device for which BAR mask is made
1854 * @flags: resource type mask to be selected
1856 * This helper routine makes bar mask from the type of resource.
1858 int pci_select_bars(struct pci_dev *dev, unsigned long flags)
1861 for (i = 0; i < PCI_NUM_RESOURCES; i++)
1862 if (pci_resource_flags(dev, i) & flags)
1867 static void __devinit pci_no_domains(void)
1869 #ifdef CONFIG_PCI_DOMAINS
1870 pci_domains_supported = 0;
1874 static int __devinit pci_init(void)
1876 struct pci_dev *dev = NULL;
1878 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1879 pci_fixup_device(pci_fixup_final, dev);
1884 static int __devinit pci_setup(char *str)
1887 char *k = strchr(str, ',');
1890 if (*str && (str = pcibios_setup(str)) && *str) {
1891 if (!strcmp(str, "nomsi")) {
1893 } else if (!strcmp(str, "noaer")) {
1895 } else if (!strcmp(str, "nodomains")) {
1897 } else if (!strncmp(str, "cbiosize=", 9)) {
1898 pci_cardbus_io_size = memparse(str + 9, &str);
1899 } else if (!strncmp(str, "cbmemsize=", 10)) {
1900 pci_cardbus_mem_size = memparse(str + 10, &str);
1902 printk(KERN_ERR "PCI: Unknown option `%s'\n",
1910 early_param("pci", pci_setup);
1912 device_initcall(pci_init);
1914 EXPORT_SYMBOL(pci_reenable_device);
1915 EXPORT_SYMBOL(pci_enable_device_io);
1916 EXPORT_SYMBOL(pci_enable_device_mem);
1917 EXPORT_SYMBOL(pci_enable_device);
1918 EXPORT_SYMBOL(pcim_enable_device);
1919 EXPORT_SYMBOL(pcim_pin_device);
1920 EXPORT_SYMBOL(pci_disable_device);
1921 EXPORT_SYMBOL(pci_find_capability);
1922 EXPORT_SYMBOL(pci_bus_find_capability);
1923 EXPORT_SYMBOL(pci_release_regions);
1924 EXPORT_SYMBOL(pci_request_regions);
1925 EXPORT_SYMBOL(pci_release_region);
1926 EXPORT_SYMBOL(pci_request_region);
1927 EXPORT_SYMBOL(pci_release_selected_regions);
1928 EXPORT_SYMBOL(pci_request_selected_regions);
1929 EXPORT_SYMBOL(pci_set_master);
1930 EXPORT_SYMBOL(pci_set_mwi);
1931 EXPORT_SYMBOL(pci_try_set_mwi);
1932 EXPORT_SYMBOL(pci_clear_mwi);
1933 EXPORT_SYMBOL_GPL(pci_intx);
1934 EXPORT_SYMBOL(pci_set_dma_mask);
1935 EXPORT_SYMBOL(pci_set_consistent_dma_mask);
1936 EXPORT_SYMBOL(pci_assign_resource);
1937 EXPORT_SYMBOL(pci_find_parent_resource);
1938 EXPORT_SYMBOL(pci_select_bars);
1940 EXPORT_SYMBOL(pci_set_power_state);
1941 EXPORT_SYMBOL(pci_save_state);
1942 EXPORT_SYMBOL(pci_restore_state);
1943 EXPORT_SYMBOL(pci_pme_capable);
1944 EXPORT_SYMBOL(pci_enable_wake);
1945 EXPORT_SYMBOL(pci_target_state);
1946 EXPORT_SYMBOL(pci_prepare_to_sleep);
1947 EXPORT_SYMBOL(pci_back_from_sleep);
1948 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);