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;
25 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
26 * @bus: pointer to PCI bus structure to search
28 * Given a PCI bus, returns the highest PCI bus number present in the set
29 * including the given PCI bus and its list of child PCI buses.
31 unsigned char __devinit
32 pci_bus_max_busnr(struct pci_bus
* bus
)
34 struct list_head
*tmp
;
37 max
= bus
->subordinate
;
38 list_for_each(tmp
, &bus
->children
) {
39 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
45 EXPORT_SYMBOL_GPL(pci_bus_max_busnr
);
49 * pci_max_busnr - returns maximum PCI bus number
51 * Returns the highest PCI bus number present in the system global list of
54 unsigned char __devinit
57 struct pci_bus
*bus
= NULL
;
61 while ((bus
= pci_find_next_bus(bus
)) != NULL
) {
62 n
= pci_bus_max_busnr(bus
);
71 #define PCI_FIND_CAP_TTL 48
73 static int __pci_find_next_cap_ttl(struct pci_bus
*bus
, unsigned int devfn
,
74 u8 pos
, int cap
, int *ttl
)
79 pci_bus_read_config_byte(bus
, devfn
, pos
, &pos
);
83 pci_bus_read_config_byte(bus
, devfn
, pos
+ PCI_CAP_LIST_ID
,
89 pos
+= PCI_CAP_LIST_NEXT
;
94 static int __pci_find_next_cap(struct pci_bus
*bus
, unsigned int devfn
,
97 int ttl
= PCI_FIND_CAP_TTL
;
99 return __pci_find_next_cap_ttl(bus
, devfn
, pos
, cap
, &ttl
);
102 int pci_find_next_capability(struct pci_dev
*dev
, u8 pos
, int cap
)
104 return __pci_find_next_cap(dev
->bus
, dev
->devfn
,
105 pos
+ PCI_CAP_LIST_NEXT
, cap
);
107 EXPORT_SYMBOL_GPL(pci_find_next_capability
);
109 static int __pci_bus_find_cap_start(struct pci_bus
*bus
,
110 unsigned int devfn
, u8 hdr_type
)
114 pci_bus_read_config_word(bus
, devfn
, PCI_STATUS
, &status
);
115 if (!(status
& PCI_STATUS_CAP_LIST
))
119 case PCI_HEADER_TYPE_NORMAL
:
120 case PCI_HEADER_TYPE_BRIDGE
:
121 return PCI_CAPABILITY_LIST
;
122 case PCI_HEADER_TYPE_CARDBUS
:
123 return PCI_CB_CAPABILITY_LIST
;
132 * pci_find_capability - query for devices' capabilities
133 * @dev: PCI device to query
134 * @cap: capability code
136 * Tell if a device supports a given PCI capability.
137 * Returns the address of the requested capability structure within the
138 * device's PCI configuration space or 0 in case the device does not
139 * support it. Possible values for @cap:
141 * %PCI_CAP_ID_PM Power Management
142 * %PCI_CAP_ID_AGP Accelerated Graphics Port
143 * %PCI_CAP_ID_VPD Vital Product Data
144 * %PCI_CAP_ID_SLOTID Slot Identification
145 * %PCI_CAP_ID_MSI Message Signalled Interrupts
146 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
147 * %PCI_CAP_ID_PCIX PCI-X
148 * %PCI_CAP_ID_EXP PCI Express
150 int pci_find_capability(struct pci_dev
*dev
, int cap
)
154 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
156 pos
= __pci_find_next_cap(dev
->bus
, dev
->devfn
, pos
, cap
);
162 * pci_bus_find_capability - query for devices' capabilities
163 * @bus: the PCI bus to query
164 * @devfn: PCI device to query
165 * @cap: capability code
167 * Like pci_find_capability() but works for pci devices that do not have a
168 * pci_dev structure set up yet.
170 * Returns the address of the requested capability structure within the
171 * device's PCI configuration space or 0 in case the device does not
174 int pci_bus_find_capability(struct pci_bus
*bus
, unsigned int devfn
, int cap
)
179 pci_bus_read_config_byte(bus
, devfn
, PCI_HEADER_TYPE
, &hdr_type
);
181 pos
= __pci_bus_find_cap_start(bus
, devfn
, hdr_type
& 0x7f);
183 pos
= __pci_find_next_cap(bus
, devfn
, pos
, cap
);
189 * pci_find_ext_capability - Find an extended capability
190 * @dev: PCI device to query
191 * @cap: capability code
193 * Returns the address of the requested extended capability structure
194 * within the device's PCI configuration space or 0 if the device does
195 * not support it. Possible values for @cap:
197 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
198 * %PCI_EXT_CAP_ID_VC Virtual Channel
199 * %PCI_EXT_CAP_ID_DSN Device Serial Number
200 * %PCI_EXT_CAP_ID_PWR Power Budgeting
202 int pci_find_ext_capability(struct pci_dev
*dev
, int cap
)
205 int ttl
= 480; /* 3840 bytes, minimum 8 bytes per capability */
208 if (dev
->cfg_size
<= 256)
211 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
215 * If we have no capabilities, this is indicated by cap ID,
216 * cap version and next pointer all being 0.
222 if (PCI_EXT_CAP_ID(header
) == cap
)
225 pos
= PCI_EXT_CAP_NEXT(header
);
229 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
235 EXPORT_SYMBOL_GPL(pci_find_ext_capability
);
237 static int __pci_find_next_ht_cap(struct pci_dev
*dev
, int pos
, int ht_cap
)
239 int rc
, ttl
= PCI_FIND_CAP_TTL
;
242 if (ht_cap
== HT_CAPTYPE_SLAVE
|| ht_cap
== HT_CAPTYPE_HOST
)
243 mask
= HT_3BIT_CAP_MASK
;
245 mask
= HT_5BIT_CAP_MASK
;
247 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
, pos
,
248 PCI_CAP_ID_HT
, &ttl
);
250 rc
= pci_read_config_byte(dev
, pos
+ 3, &cap
);
251 if (rc
!= PCIBIOS_SUCCESSFUL
)
254 if ((cap
& mask
) == ht_cap
)
257 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
,
258 pos
+ PCI_CAP_LIST_NEXT
,
259 PCI_CAP_ID_HT
, &ttl
);
265 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
266 * @dev: PCI device to query
267 * @pos: Position from which to continue searching
268 * @ht_cap: Hypertransport capability code
270 * To be used in conjunction with pci_find_ht_capability() to search for
271 * all capabilities matching @ht_cap. @pos should always be a value returned
272 * from pci_find_ht_capability().
274 * NB. To be 100% safe against broken PCI devices, the caller should take
275 * steps to avoid an infinite loop.
277 int pci_find_next_ht_capability(struct pci_dev
*dev
, int pos
, int ht_cap
)
279 return __pci_find_next_ht_cap(dev
, pos
+ PCI_CAP_LIST_NEXT
, ht_cap
);
281 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability
);
284 * pci_find_ht_capability - query a device's Hypertransport capabilities
285 * @dev: PCI device to query
286 * @ht_cap: Hypertransport capability code
288 * Tell if a device supports a given Hypertransport capability.
289 * Returns an address within the device's PCI configuration space
290 * or 0 in case the device does not support the request capability.
291 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
292 * which has a Hypertransport capability matching @ht_cap.
294 int pci_find_ht_capability(struct pci_dev
*dev
, int ht_cap
)
298 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
300 pos
= __pci_find_next_ht_cap(dev
, pos
, ht_cap
);
304 EXPORT_SYMBOL_GPL(pci_find_ht_capability
);
307 * pci_find_parent_resource - return resource region of parent bus of given region
308 * @dev: PCI device structure contains resources to be searched
309 * @res: child resource record for which parent is sought
311 * For given resource region of given device, return the resource
312 * region of parent bus the given region is contained in or where
313 * it should be allocated from.
316 pci_find_parent_resource(const struct pci_dev
*dev
, struct resource
*res
)
318 const struct pci_bus
*bus
= dev
->bus
;
320 struct resource
*best
= NULL
;
322 for(i
= 0; i
< PCI_BUS_NUM_RESOURCES
; i
++) {
323 struct resource
*r
= bus
->resource
[i
];
326 if (res
->start
&& !(res
->start
>= r
->start
&& res
->end
<= r
->end
))
327 continue; /* Not contained */
328 if ((res
->flags
^ r
->flags
) & (IORESOURCE_IO
| IORESOURCE_MEM
))
329 continue; /* Wrong type */
330 if (!((res
->flags
^ r
->flags
) & IORESOURCE_PREFETCH
))
331 return r
; /* Exact match */
332 if ((res
->flags
& IORESOURCE_PREFETCH
) && !(r
->flags
& IORESOURCE_PREFETCH
))
333 best
= r
; /* Approximating prefetchable by non-prefetchable */
339 * pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
340 * @dev: PCI device to have its BARs restored
342 * Restore the BAR values for a given device, so as to make it
343 * accessible by its driver.
346 pci_restore_bars(struct pci_dev
*dev
)
350 switch (dev
->hdr_type
) {
351 case PCI_HEADER_TYPE_NORMAL
:
354 case PCI_HEADER_TYPE_BRIDGE
:
357 case PCI_HEADER_TYPE_CARDBUS
:
361 /* Should never get here, but just in case... */
365 for (i
= 0; i
< numres
; i
++)
366 pci_update_resource(dev
, &dev
->resource
[i
], i
);
369 int (*platform_pci_set_power_state
)(struct pci_dev
*dev
, pci_power_t t
);
372 * pci_set_power_state - Set the power state of a PCI device
373 * @dev: PCI device to be suspended
374 * @state: PCI power state (D0, D1, D2, D3hot, D3cold) we're entering
376 * Transition a device to a new power state, using the Power Management
377 * Capabilities in the device's config space.
380 * -EINVAL if trying to enter a lower state than we're already in.
381 * 0 if we're already in the requested state.
382 * -EIO if device does not support PCI PM.
383 * 0 if we can successfully change the power state.
386 pci_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
388 int pm
, need_restore
= 0;
391 /* bound the state we're entering */
392 if (state
> PCI_D3hot
)
395 /* Validate current state:
396 * Can enter D0 from any state, but if we can only go deeper
397 * to sleep if we're already in a low power state
399 if (state
!= PCI_D0
&& dev
->current_state
> state
) {
400 printk(KERN_ERR
"%s(): %s: state=%d, current state=%d\n",
401 __FUNCTION__
, pci_name(dev
), state
, dev
->current_state
);
403 } else if (dev
->current_state
== state
)
404 return 0; /* we're already there */
407 * If the device or the parent bridge can't support PCI PM, ignore
408 * the request if we're doing anything besides putting it into D0
409 * (which would only happen on boot).
411 if ((state
== PCI_D1
|| state
== PCI_D2
) && pci_no_d1d2(dev
))
414 /* find PCI PM capability in list */
415 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
417 /* abort if the device doesn't support PM capabilities */
421 pci_read_config_word(dev
,pm
+ PCI_PM_PMC
,&pmc
);
422 if ((pmc
& PCI_PM_CAP_VER_MASK
) > 3) {
424 "PCI: %s has unsupported PM cap regs version (%u)\n",
425 pci_name(dev
), pmc
& PCI_PM_CAP_VER_MASK
);
429 /* check if this device supports the desired state */
430 if (state
== PCI_D1
&& !(pmc
& PCI_PM_CAP_D1
))
432 else if (state
== PCI_D2
&& !(pmc
& PCI_PM_CAP_D2
))
435 pci_read_config_word(dev
, pm
+ PCI_PM_CTRL
, &pmcsr
);
437 /* If we're (effectively) in D3, force entire word to 0.
438 * This doesn't affect PME_Status, disables PME_En, and
439 * sets PowerState to 0.
441 switch (dev
->current_state
) {
445 pmcsr
&= ~PCI_PM_CTRL_STATE_MASK
;
448 case PCI_UNKNOWN
: /* Boot-up */
449 if ((pmcsr
& PCI_PM_CTRL_STATE_MASK
) == PCI_D3hot
450 && !(pmcsr
& PCI_PM_CTRL_NO_SOFT_RESET
))
452 /* Fall-through: force to D0 */
458 /* enter specified state */
459 pci_write_config_word(dev
, pm
+ PCI_PM_CTRL
, pmcsr
);
461 /* Mandatory power management transition delays */
462 /* see PCI PM 1.1 5.6.1 table 18 */
463 if (state
== PCI_D3hot
|| dev
->current_state
== PCI_D3hot
)
464 msleep(pci_pm_d3_delay
);
465 else if (state
== PCI_D2
|| dev
->current_state
== PCI_D2
)
469 * Give firmware a chance to be called, such as ACPI _PRx, _PSx
470 * Firmware method after native method ?
472 if (platform_pci_set_power_state
)
473 platform_pci_set_power_state(dev
, state
);
475 dev
->current_state
= state
;
477 /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
478 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
479 * from D3hot to D0 _may_ perform an internal reset, thereby
480 * going to "D0 Uninitialized" rather than "D0 Initialized".
481 * For example, at least some versions of the 3c905B and the
482 * 3c556B exhibit this behaviour.
484 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
485 * devices in a D3hot state at boot. Consequently, we need to
486 * restore at least the BARs so that the device will be
487 * accessible to its driver.
490 pci_restore_bars(dev
);
495 int (*platform_pci_choose_state
)(struct pci_dev
*dev
, pm_message_t state
);
498 * pci_choose_state - Choose the power state of a PCI device
499 * @dev: PCI device to be suspended
500 * @state: target sleep state for the whole system. This is the value
501 * that is passed to suspend() function.
503 * Returns PCI power state suitable for given device and given system
507 pci_power_t
pci_choose_state(struct pci_dev
*dev
, pm_message_t state
)
511 if (!pci_find_capability(dev
, PCI_CAP_ID_PM
))
514 if (platform_pci_choose_state
) {
515 ret
= platform_pci_choose_state(dev
, state
);
520 switch (state
.event
) {
523 case PM_EVENT_FREEZE
:
524 case PM_EVENT_PRETHAW
:
525 /* REVISIT both freeze and pre-thaw "should" use D0 */
526 case PM_EVENT_SUSPEND
:
529 printk("Unrecognized suspend event %d\n", state
.event
);
535 EXPORT_SYMBOL(pci_choose_state
);
537 static int pci_save_pcie_state(struct pci_dev
*dev
)
540 struct pci_cap_saved_state
*save_state
;
543 pos
= pci_find_capability(dev
, PCI_CAP_ID_EXP
);
547 save_state
= kzalloc(sizeof(*save_state
) + sizeof(u16
) * 4, GFP_KERNEL
);
549 dev_err(&dev
->dev
, "Out of memory in pci_save_pcie_state\n");
552 cap
= (u16
*)&save_state
->data
[0];
554 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, &cap
[i
++]);
555 pci_read_config_word(dev
, pos
+ PCI_EXP_LNKCTL
, &cap
[i
++]);
556 pci_read_config_word(dev
, pos
+ PCI_EXP_SLTCTL
, &cap
[i
++]);
557 pci_read_config_word(dev
, pos
+ PCI_EXP_RTCTL
, &cap
[i
++]);
558 pci_add_saved_cap(dev
, save_state
);
562 static void pci_restore_pcie_state(struct pci_dev
*dev
)
565 struct pci_cap_saved_state
*save_state
;
568 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
569 pos
= pci_find_capability(dev
, PCI_CAP_ID_EXP
);
570 if (!save_state
|| pos
<= 0)
572 cap
= (u16
*)&save_state
->data
[0];
574 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, cap
[i
++]);
575 pci_write_config_word(dev
, pos
+ PCI_EXP_LNKCTL
, cap
[i
++]);
576 pci_write_config_word(dev
, pos
+ PCI_EXP_SLTCTL
, cap
[i
++]);
577 pci_write_config_word(dev
, pos
+ PCI_EXP_RTCTL
, cap
[i
++]);
578 pci_remove_saved_cap(save_state
);
583 static int pci_save_pcix_state(struct pci_dev
*dev
)
586 struct pci_cap_saved_state
*save_state
;
589 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
593 save_state
= kzalloc(sizeof(*save_state
) + sizeof(u16
), GFP_KERNEL
);
595 dev_err(&dev
->dev
, "Out of memory in pci_save_pcie_state\n");
598 cap
= (u16
*)&save_state
->data
[0];
600 pci_read_config_word(dev
, pos
+ PCI_X_CMD
, &cap
[i
++]);
601 pci_add_saved_cap(dev
, save_state
);
605 static void pci_restore_pcix_state(struct pci_dev
*dev
)
608 struct pci_cap_saved_state
*save_state
;
611 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
612 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
613 if (!save_state
|| pos
<= 0)
615 cap
= (u16
*)&save_state
->data
[0];
617 pci_write_config_word(dev
, pos
+ PCI_X_CMD
, cap
[i
++]);
618 pci_remove_saved_cap(save_state
);
624 * pci_save_state - save the PCI configuration space of a device before suspending
625 * @dev: - PCI device that we're dealing with
628 pci_save_state(struct pci_dev
*dev
)
631 /* XXX: 100% dword access ok here? */
632 for (i
= 0; i
< 16; i
++)
633 pci_read_config_dword(dev
, i
* 4,&dev
->saved_config_space
[i
]);
634 if ((i
= pci_save_msi_state(dev
)) != 0)
636 if ((i
= pci_save_msix_state(dev
)) != 0)
638 if ((i
= pci_save_pcie_state(dev
)) != 0)
640 if ((i
= pci_save_pcix_state(dev
)) != 0)
646 * pci_restore_state - Restore the saved state of a PCI device
647 * @dev: - PCI device that we're dealing with
650 pci_restore_state(struct pci_dev
*dev
)
655 /* PCI Express register must be restored first */
656 pci_restore_pcie_state(dev
);
659 * The Base Address register should be programmed before the command
662 for (i
= 15; i
>= 0; i
--) {
663 pci_read_config_dword(dev
, i
* 4, &val
);
664 if (val
!= dev
->saved_config_space
[i
]) {
665 printk(KERN_DEBUG
"PM: Writing back config space on "
666 "device %s at offset %x (was %x, writing %x)\n",
668 val
, (int)dev
->saved_config_space
[i
]);
669 pci_write_config_dword(dev
,i
* 4,
670 dev
->saved_config_space
[i
]);
673 pci_restore_pcix_state(dev
);
674 pci_restore_msi_state(dev
);
675 pci_restore_msix_state(dev
);
679 static int do_pci_enable_device(struct pci_dev
*dev
, int bars
)
683 err
= pci_set_power_state(dev
, PCI_D0
);
684 if (err
< 0 && err
!= -EIO
)
686 err
= pcibios_enable_device(dev
, bars
);
689 pci_fixup_device(pci_fixup_enable
, dev
);
695 * __pci_reenable_device - Resume abandoned device
696 * @dev: PCI device to be resumed
698 * Note this function is a backend of pci_default_resume and is not supposed
699 * to be called by normal code, write proper resume handler and use it instead.
702 __pci_reenable_device(struct pci_dev
*dev
)
704 if (atomic_read(&dev
->enable_cnt
))
705 return do_pci_enable_device(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
710 * pci_enable_device_bars - Initialize some of a device for use
711 * @dev: PCI device to be initialized
712 * @bars: bitmask of BAR's that must be configured
714 * Initialize device before it's used by a driver. Ask low-level code
715 * to enable selected I/O and memory resources. Wake up the device if it
716 * was suspended. Beware, this function can fail.
719 pci_enable_device_bars(struct pci_dev
*dev
, int bars
)
723 if (atomic_add_return(1, &dev
->enable_cnt
) > 1)
724 return 0; /* already enabled */
726 err
= do_pci_enable_device(dev
, bars
);
728 atomic_dec(&dev
->enable_cnt
);
733 * pci_enable_device - Initialize device before it's used by a driver.
734 * @dev: PCI device to be initialized
736 * Initialize device before it's used by a driver. Ask low-level code
737 * to enable I/O and memory. Wake up the device if it was suspended.
738 * Beware, this function can fail.
740 * Note we don't actually enable the device many times if we call
741 * this function repeatedly (we just increment the count).
743 int pci_enable_device(struct pci_dev
*dev
)
745 return pci_enable_device_bars(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
749 * pcibios_disable_device - disable arch specific PCI resources for device dev
750 * @dev: the PCI device to disable
752 * Disables architecture specific PCI resources for the device. This
753 * is the default implementation. Architecture implementations can
756 void __attribute__ ((weak
)) pcibios_disable_device (struct pci_dev
*dev
) {}
759 * pci_disable_device - Disable PCI device after use
760 * @dev: PCI device to be disabled
762 * Signal to the system that the PCI device is not in use by the system
763 * anymore. This only involves disabling PCI bus-mastering, if active.
765 * Note we don't actually disable the device until all callers of
766 * pci_device_enable() have called pci_device_disable().
769 pci_disable_device(struct pci_dev
*dev
)
773 if (atomic_sub_return(1, &dev
->enable_cnt
) != 0)
776 if (dev
->msi_enabled
)
777 disable_msi_mode(dev
, pci_find_capability(dev
, PCI_CAP_ID_MSI
),
779 if (dev
->msix_enabled
)
780 disable_msi_mode(dev
, pci_find_capability(dev
, PCI_CAP_ID_MSI
),
783 pci_read_config_word(dev
, PCI_COMMAND
, &pci_command
);
784 if (pci_command
& PCI_COMMAND_MASTER
) {
785 pci_command
&= ~PCI_COMMAND_MASTER
;
786 pci_write_config_word(dev
, PCI_COMMAND
, pci_command
);
788 dev
->is_busmaster
= 0;
790 pcibios_disable_device(dev
);
794 * pci_enable_wake - enable device to generate PME# when suspended
795 * @dev: - PCI device to operate on
796 * @state: - Current state of device.
797 * @enable: - Flag to enable or disable generation
799 * Set the bits in the device's PM Capabilities to generate PME# when
800 * the system is suspended.
802 * -EIO is returned if device doesn't have PM Capabilities.
803 * -EINVAL is returned if device supports it, but can't generate wake events.
804 * 0 if operation is successful.
807 int pci_enable_wake(struct pci_dev
*dev
, pci_power_t state
, int enable
)
812 /* find PCI PM capability in list */
813 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
815 /* If device doesn't support PM Capabilities, but request is to disable
816 * wake events, it's a nop; otherwise fail */
818 return enable
? -EIO
: 0;
820 /* Check device's ability to generate PME# */
821 pci_read_config_word(dev
,pm
+PCI_PM_PMC
,&value
);
823 value
&= PCI_PM_CAP_PME_MASK
;
824 value
>>= ffs(PCI_PM_CAP_PME_MASK
) - 1; /* First bit of mask */
826 /* Check if it can generate PME# from requested state. */
827 if (!value
|| !(value
& (1 << state
)))
828 return enable
? -EINVAL
: 0;
830 pci_read_config_word(dev
, pm
+ PCI_PM_CTRL
, &value
);
832 /* Clear PME_Status by writing 1 to it and enable PME# */
833 value
|= PCI_PM_CTRL_PME_STATUS
| PCI_PM_CTRL_PME_ENABLE
;
836 value
&= ~PCI_PM_CTRL_PME_ENABLE
;
838 pci_write_config_word(dev
, pm
+ PCI_PM_CTRL
, value
);
844 pci_get_interrupt_pin(struct pci_dev
*dev
, struct pci_dev
**bridge
)
852 while (dev
->bus
->self
) {
853 pin
= (pin
+ PCI_SLOT(dev
->devfn
)) % 4;
854 dev
= dev
->bus
->self
;
861 * pci_release_region - Release a PCI bar
862 * @pdev: PCI device whose resources were previously reserved by pci_request_region
863 * @bar: BAR to release
865 * Releases the PCI I/O and memory resources previously reserved by a
866 * successful call to pci_request_region. Call this function only
867 * after all use of the PCI regions has ceased.
869 void pci_release_region(struct pci_dev
*pdev
, int bar
)
871 if (pci_resource_len(pdev
, bar
) == 0)
873 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
874 release_region(pci_resource_start(pdev
, bar
),
875 pci_resource_len(pdev
, bar
));
876 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
877 release_mem_region(pci_resource_start(pdev
, bar
),
878 pci_resource_len(pdev
, bar
));
882 * pci_request_region - Reserved PCI I/O and memory resource
883 * @pdev: PCI device whose resources are to be reserved
884 * @bar: BAR to be reserved
885 * @res_name: Name to be associated with resource.
887 * Mark the PCI region associated with PCI device @pdev BR @bar as
888 * being reserved by owner @res_name. Do not access any
889 * address inside the PCI regions unless this call returns
892 * Returns 0 on success, or %EBUSY on error. A warning
893 * message is also printed on failure.
895 int pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
)
897 if (pci_resource_len(pdev
, bar
) == 0)
900 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
) {
901 if (!request_region(pci_resource_start(pdev
, bar
),
902 pci_resource_len(pdev
, bar
), res_name
))
905 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
) {
906 if (!request_mem_region(pci_resource_start(pdev
, bar
),
907 pci_resource_len(pdev
, bar
), res_name
))
914 printk (KERN_WARNING
"PCI: Unable to reserve %s region #%d:%llx@%llx "
916 pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
? "I/O" : "mem",
917 bar
+ 1, /* PCI BAR # */
918 (unsigned long long)pci_resource_len(pdev
, bar
),
919 (unsigned long long)pci_resource_start(pdev
, bar
),
925 * pci_release_selected_regions - Release selected PCI I/O and memory resources
926 * @pdev: PCI device whose resources were previously reserved
927 * @bars: Bitmask of BARs to be released
929 * Release selected PCI I/O and memory resources previously reserved.
930 * Call this function only after all use of the PCI regions has ceased.
932 void pci_release_selected_regions(struct pci_dev
*pdev
, int bars
)
936 for (i
= 0; i
< 6; i
++)
938 pci_release_region(pdev
, i
);
942 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
943 * @pdev: PCI device whose resources are to be reserved
944 * @bars: Bitmask of BARs to be requested
945 * @res_name: Name to be associated with resource
947 int pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
948 const char *res_name
)
952 for (i
= 0; i
< 6; i
++)
954 if(pci_request_region(pdev
, i
, res_name
))
961 pci_release_region(pdev
, i
);
967 * pci_release_regions - Release reserved PCI I/O and memory resources
968 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
970 * Releases all PCI I/O and memory resources previously reserved by a
971 * successful call to pci_request_regions. Call this function only
972 * after all use of the PCI regions has ceased.
975 void pci_release_regions(struct pci_dev
*pdev
)
977 pci_release_selected_regions(pdev
, (1 << 6) - 1);
981 * pci_request_regions - Reserved PCI I/O and memory resources
982 * @pdev: PCI device whose resources are to be reserved
983 * @res_name: Name to be associated with resource.
985 * Mark all PCI regions associated with PCI device @pdev as
986 * being reserved by owner @res_name. Do not access any
987 * address inside the PCI regions unless this call returns
990 * Returns 0 on success, or %EBUSY on error. A warning
991 * message is also printed on failure.
993 int pci_request_regions(struct pci_dev
*pdev
, const char *res_name
)
995 return pci_request_selected_regions(pdev
, ((1 << 6) - 1), res_name
);
999 * pci_set_master - enables bus-mastering for device dev
1000 * @dev: the PCI device to enable
1002 * Enables bus-mastering on the device and calls pcibios_set_master()
1003 * to do the needed arch specific settings.
1006 pci_set_master(struct pci_dev
*dev
)
1010 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1011 if (! (cmd
& PCI_COMMAND_MASTER
)) {
1012 pr_debug("PCI: Enabling bus mastering for device %s\n", pci_name(dev
));
1013 cmd
|= PCI_COMMAND_MASTER
;
1014 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
1016 dev
->is_busmaster
= 1;
1017 pcibios_set_master(dev
);
1020 #ifdef PCI_DISABLE_MWI
1021 int pci_set_mwi(struct pci_dev
*dev
)
1026 void pci_clear_mwi(struct pci_dev
*dev
)
1032 #ifndef PCI_CACHE_LINE_BYTES
1033 #define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES
1036 /* This can be overridden by arch code. */
1037 /* Don't forget this is measured in 32-bit words, not bytes */
1038 u8 pci_cache_line_size
= PCI_CACHE_LINE_BYTES
/ 4;
1041 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
1042 * @dev: the PCI device for which MWI is to be enabled
1044 * Helper function for pci_set_mwi.
1045 * Originally copied from drivers/net/acenic.c.
1046 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
1048 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1051 pci_set_cacheline_size(struct pci_dev
*dev
)
1055 if (!pci_cache_line_size
)
1056 return -EINVAL
; /* The system doesn't support MWI. */
1058 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
1059 equal to or multiple of the right value. */
1060 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
1061 if (cacheline_size
>= pci_cache_line_size
&&
1062 (cacheline_size
% pci_cache_line_size
) == 0)
1065 /* Write the correct value. */
1066 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
, pci_cache_line_size
);
1068 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
1069 if (cacheline_size
== pci_cache_line_size
)
1072 printk(KERN_DEBUG
"PCI: cache line size of %d is not supported "
1073 "by device %s\n", pci_cache_line_size
<< 2, pci_name(dev
));
1079 * pci_set_mwi - enables memory-write-invalidate PCI transaction
1080 * @dev: the PCI device for which MWI is enabled
1082 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND,
1083 * and then calls @pcibios_set_mwi to do the needed arch specific
1084 * operations or a generic mwi-prep function.
1086 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1089 pci_set_mwi(struct pci_dev
*dev
)
1094 rc
= pci_set_cacheline_size(dev
);
1098 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1099 if (! (cmd
& PCI_COMMAND_INVALIDATE
)) {
1100 pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n", pci_name(dev
));
1101 cmd
|= PCI_COMMAND_INVALIDATE
;
1102 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
1109 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
1110 * @dev: the PCI device to disable
1112 * Disables PCI Memory-Write-Invalidate transaction on the device
1115 pci_clear_mwi(struct pci_dev
*dev
)
1119 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1120 if (cmd
& PCI_COMMAND_INVALIDATE
) {
1121 cmd
&= ~PCI_COMMAND_INVALIDATE
;
1122 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
1125 #endif /* ! PCI_DISABLE_MWI */
1128 * pci_intx - enables/disables PCI INTx for device dev
1129 * @pdev: the PCI device to operate on
1130 * @enable: boolean: whether to enable or disable PCI INTx
1132 * Enables/disables PCI INTx for device dev
1135 pci_intx(struct pci_dev
*pdev
, int enable
)
1137 u16 pci_command
, new;
1139 pci_read_config_word(pdev
, PCI_COMMAND
, &pci_command
);
1142 new = pci_command
& ~PCI_COMMAND_INTX_DISABLE
;
1144 new = pci_command
| PCI_COMMAND_INTX_DISABLE
;
1147 if (new != pci_command
) {
1148 pci_write_config_word(pdev
, PCI_COMMAND
, new);
1152 #ifndef HAVE_ARCH_PCI_SET_DMA_MASK
1154 * These can be overridden by arch-specific implementations
1157 pci_set_dma_mask(struct pci_dev
*dev
, u64 mask
)
1159 if (!pci_dma_supported(dev
, mask
))
1162 dev
->dma_mask
= mask
;
1168 pci_set_consistent_dma_mask(struct pci_dev
*dev
, u64 mask
)
1170 if (!pci_dma_supported(dev
, mask
))
1173 dev
->dev
.coherent_dma_mask
= mask
;
1180 * pci_select_bars - Make BAR mask from the type of resource
1181 * @pdev: the PCI device for which BAR mask is made
1182 * @flags: resource type mask to be selected
1184 * This helper routine makes bar mask from the type of resource.
1186 int pci_select_bars(struct pci_dev
*dev
, unsigned long flags
)
1189 for (i
= 0; i
< PCI_NUM_RESOURCES
; i
++)
1190 if (pci_resource_flags(dev
, i
) & flags
)
1195 static int __devinit
pci_init(void)
1197 struct pci_dev
*dev
= NULL
;
1199 while ((dev
= pci_get_device(PCI_ANY_ID
, PCI_ANY_ID
, dev
)) != NULL
) {
1200 pci_fixup_device(pci_fixup_final
, dev
);
1205 static int __devinit
pci_setup(char *str
)
1208 char *k
= strchr(str
, ',');
1211 if (*str
&& (str
= pcibios_setup(str
)) && *str
) {
1212 if (!strcmp(str
, "nomsi")) {
1215 printk(KERN_ERR
"PCI: Unknown option `%s'\n",
1223 early_param("pci", pci_setup
);
1225 device_initcall(pci_init
);
1227 EXPORT_SYMBOL_GPL(pci_restore_bars
);
1228 EXPORT_SYMBOL(pci_enable_device_bars
);
1229 EXPORT_SYMBOL(pci_enable_device
);
1230 EXPORT_SYMBOL(pci_disable_device
);
1231 EXPORT_SYMBOL(pci_find_capability
);
1232 EXPORT_SYMBOL(pci_bus_find_capability
);
1233 EXPORT_SYMBOL(pci_release_regions
);
1234 EXPORT_SYMBOL(pci_request_regions
);
1235 EXPORT_SYMBOL(pci_release_region
);
1236 EXPORT_SYMBOL(pci_request_region
);
1237 EXPORT_SYMBOL(pci_release_selected_regions
);
1238 EXPORT_SYMBOL(pci_request_selected_regions
);
1239 EXPORT_SYMBOL(pci_set_master
);
1240 EXPORT_SYMBOL(pci_set_mwi
);
1241 EXPORT_SYMBOL(pci_clear_mwi
);
1242 EXPORT_SYMBOL_GPL(pci_intx
);
1243 EXPORT_SYMBOL(pci_set_dma_mask
);
1244 EXPORT_SYMBOL(pci_set_consistent_dma_mask
);
1245 EXPORT_SYMBOL(pci_assign_resource
);
1246 EXPORT_SYMBOL(pci_find_parent_resource
);
1247 EXPORT_SYMBOL(pci_select_bars
);
1249 EXPORT_SYMBOL(pci_set_power_state
);
1250 EXPORT_SYMBOL(pci_save_state
);
1251 EXPORT_SYMBOL(pci_restore_state
);
1252 EXPORT_SYMBOL(pci_enable_wake
);