2 * $Id: pci.c,v 1.91 1999/01/21 13:34:01 davem Exp $
4 * PCI Bus Services, see include/linux/pci.h for further explanation.
6 * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
9 * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/init.h>
15 #include <linux/pci.h>
17 #include <linux/module.h>
18 #include <linux/spinlock.h>
19 #include <linux/string.h>
20 #include <asm/dma.h> /* isa_dma_bridge_buggy */
23 unsigned int pci_pm_d3_delay
= 10;
25 #define DEFAULT_CARDBUS_IO_SIZE (256)
26 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
27 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
28 unsigned long pci_cardbus_io_size
= DEFAULT_CARDBUS_IO_SIZE
;
29 unsigned long pci_cardbus_mem_size
= DEFAULT_CARDBUS_MEM_SIZE
;
32 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
33 * @bus: pointer to PCI bus structure to search
35 * Given a PCI bus, returns the highest PCI bus number present in the set
36 * including the given PCI bus and its list of child PCI buses.
38 unsigned char __devinit
39 pci_bus_max_busnr(struct pci_bus
* bus
)
41 struct list_head
*tmp
;
44 max
= bus
->subordinate
;
45 list_for_each(tmp
, &bus
->children
) {
46 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
52 EXPORT_SYMBOL_GPL(pci_bus_max_busnr
);
56 * pci_max_busnr - returns maximum PCI bus number
58 * Returns the highest PCI bus number present in the system global list of
61 unsigned char __devinit
64 struct pci_bus
*bus
= NULL
;
68 while ((bus
= pci_find_next_bus(bus
)) != NULL
) {
69 n
= pci_bus_max_busnr(bus
);
78 #define PCI_FIND_CAP_TTL 48
80 static int __pci_find_next_cap_ttl(struct pci_bus
*bus
, unsigned int devfn
,
81 u8 pos
, int cap
, int *ttl
)
86 pci_bus_read_config_byte(bus
, devfn
, pos
, &pos
);
90 pci_bus_read_config_byte(bus
, devfn
, pos
+ PCI_CAP_LIST_ID
,
96 pos
+= PCI_CAP_LIST_NEXT
;
101 static int __pci_find_next_cap(struct pci_bus
*bus
, unsigned int devfn
,
104 int ttl
= PCI_FIND_CAP_TTL
;
106 return __pci_find_next_cap_ttl(bus
, devfn
, pos
, cap
, &ttl
);
109 int pci_find_next_capability(struct pci_dev
*dev
, u8 pos
, int cap
)
111 return __pci_find_next_cap(dev
->bus
, dev
->devfn
,
112 pos
+ PCI_CAP_LIST_NEXT
, cap
);
114 EXPORT_SYMBOL_GPL(pci_find_next_capability
);
116 static int __pci_bus_find_cap_start(struct pci_bus
*bus
,
117 unsigned int devfn
, u8 hdr_type
)
121 pci_bus_read_config_word(bus
, devfn
, PCI_STATUS
, &status
);
122 if (!(status
& PCI_STATUS_CAP_LIST
))
126 case PCI_HEADER_TYPE_NORMAL
:
127 case PCI_HEADER_TYPE_BRIDGE
:
128 return PCI_CAPABILITY_LIST
;
129 case PCI_HEADER_TYPE_CARDBUS
:
130 return PCI_CB_CAPABILITY_LIST
;
139 * pci_find_capability - query for devices' capabilities
140 * @dev: PCI device to query
141 * @cap: capability code
143 * Tell if a device supports a given PCI capability.
144 * Returns the address of the requested capability structure within the
145 * device's PCI configuration space or 0 in case the device does not
146 * support it. Possible values for @cap:
148 * %PCI_CAP_ID_PM Power Management
149 * %PCI_CAP_ID_AGP Accelerated Graphics Port
150 * %PCI_CAP_ID_VPD Vital Product Data
151 * %PCI_CAP_ID_SLOTID Slot Identification
152 * %PCI_CAP_ID_MSI Message Signalled Interrupts
153 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
154 * %PCI_CAP_ID_PCIX PCI-X
155 * %PCI_CAP_ID_EXP PCI Express
157 int pci_find_capability(struct pci_dev
*dev
, int cap
)
161 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
163 pos
= __pci_find_next_cap(dev
->bus
, dev
->devfn
, pos
, cap
);
169 * pci_bus_find_capability - query for devices' capabilities
170 * @bus: the PCI bus to query
171 * @devfn: PCI device to query
172 * @cap: capability code
174 * Like pci_find_capability() but works for pci devices that do not have a
175 * pci_dev structure set up yet.
177 * Returns the address of the requested capability structure within the
178 * device's PCI configuration space or 0 in case the device does not
181 int pci_bus_find_capability(struct pci_bus
*bus
, unsigned int devfn
, int cap
)
186 pci_bus_read_config_byte(bus
, devfn
, PCI_HEADER_TYPE
, &hdr_type
);
188 pos
= __pci_bus_find_cap_start(bus
, devfn
, hdr_type
& 0x7f);
190 pos
= __pci_find_next_cap(bus
, devfn
, pos
, cap
);
196 * pci_find_ext_capability - Find an extended capability
197 * @dev: PCI device to query
198 * @cap: capability code
200 * Returns the address of the requested extended capability structure
201 * within the device's PCI configuration space or 0 if the device does
202 * not support it. Possible values for @cap:
204 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
205 * %PCI_EXT_CAP_ID_VC Virtual Channel
206 * %PCI_EXT_CAP_ID_DSN Device Serial Number
207 * %PCI_EXT_CAP_ID_PWR Power Budgeting
209 int pci_find_ext_capability(struct pci_dev
*dev
, int cap
)
212 int ttl
= 480; /* 3840 bytes, minimum 8 bytes per capability */
215 if (dev
->cfg_size
<= 256)
218 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
222 * If we have no capabilities, this is indicated by cap ID,
223 * cap version and next pointer all being 0.
229 if (PCI_EXT_CAP_ID(header
) == cap
)
232 pos
= PCI_EXT_CAP_NEXT(header
);
236 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
242 EXPORT_SYMBOL_GPL(pci_find_ext_capability
);
244 static int __pci_find_next_ht_cap(struct pci_dev
*dev
, int pos
, int ht_cap
)
246 int rc
, ttl
= PCI_FIND_CAP_TTL
;
249 if (ht_cap
== HT_CAPTYPE_SLAVE
|| ht_cap
== HT_CAPTYPE_HOST
)
250 mask
= HT_3BIT_CAP_MASK
;
252 mask
= HT_5BIT_CAP_MASK
;
254 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
, pos
,
255 PCI_CAP_ID_HT
, &ttl
);
257 rc
= pci_read_config_byte(dev
, pos
+ 3, &cap
);
258 if (rc
!= PCIBIOS_SUCCESSFUL
)
261 if ((cap
& mask
) == ht_cap
)
264 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
,
265 pos
+ PCI_CAP_LIST_NEXT
,
266 PCI_CAP_ID_HT
, &ttl
);
272 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
273 * @dev: PCI device to query
274 * @pos: Position from which to continue searching
275 * @ht_cap: Hypertransport capability code
277 * To be used in conjunction with pci_find_ht_capability() to search for
278 * all capabilities matching @ht_cap. @pos should always be a value returned
279 * from pci_find_ht_capability().
281 * NB. To be 100% safe against broken PCI devices, the caller should take
282 * steps to avoid an infinite loop.
284 int pci_find_next_ht_capability(struct pci_dev
*dev
, int pos
, int ht_cap
)
286 return __pci_find_next_ht_cap(dev
, pos
+ PCI_CAP_LIST_NEXT
, ht_cap
);
288 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability
);
291 * pci_find_ht_capability - query a device's Hypertransport capabilities
292 * @dev: PCI device to query
293 * @ht_cap: Hypertransport capability code
295 * Tell if a device supports a given Hypertransport capability.
296 * Returns an address within the device's PCI configuration space
297 * or 0 in case the device does not support the request capability.
298 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
299 * which has a Hypertransport capability matching @ht_cap.
301 int pci_find_ht_capability(struct pci_dev
*dev
, int ht_cap
)
305 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
307 pos
= __pci_find_next_ht_cap(dev
, pos
, ht_cap
);
311 EXPORT_SYMBOL_GPL(pci_find_ht_capability
);
314 * pci_find_parent_resource - return resource region of parent bus of given region
315 * @dev: PCI device structure contains resources to be searched
316 * @res: child resource record for which parent is sought
318 * For given resource region of given device, return the resource
319 * region of parent bus the given region is contained in or where
320 * it should be allocated from.
323 pci_find_parent_resource(const struct pci_dev
*dev
, struct resource
*res
)
325 const struct pci_bus
*bus
= dev
->bus
;
327 struct resource
*best
= NULL
;
329 for(i
= 0; i
< PCI_BUS_NUM_RESOURCES
; i
++) {
330 struct resource
*r
= bus
->resource
[i
];
333 if (res
->start
&& !(res
->start
>= r
->start
&& res
->end
<= r
->end
))
334 continue; /* Not contained */
335 if ((res
->flags
^ r
->flags
) & (IORESOURCE_IO
| IORESOURCE_MEM
))
336 continue; /* Wrong type */
337 if (!((res
->flags
^ r
->flags
) & IORESOURCE_PREFETCH
))
338 return r
; /* Exact match */
339 if ((res
->flags
& IORESOURCE_PREFETCH
) && !(r
->flags
& IORESOURCE_PREFETCH
))
340 best
= r
; /* Approximating prefetchable by non-prefetchable */
346 * pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
347 * @dev: PCI device to have its BARs restored
349 * Restore the BAR values for a given device, so as to make it
350 * accessible by its driver.
353 pci_restore_bars(struct pci_dev
*dev
)
357 switch (dev
->hdr_type
) {
358 case PCI_HEADER_TYPE_NORMAL
:
361 case PCI_HEADER_TYPE_BRIDGE
:
364 case PCI_HEADER_TYPE_CARDBUS
:
368 /* Should never get here, but just in case... */
372 for (i
= 0; i
< numres
; i
++)
373 pci_update_resource(dev
, &dev
->resource
[i
], i
);
376 int (*platform_pci_set_power_state
)(struct pci_dev
*dev
, pci_power_t t
);
379 * pci_set_power_state - Set the power state of a PCI device
380 * @dev: PCI device to be suspended
381 * @state: PCI power state (D0, D1, D2, D3hot, D3cold) we're entering
383 * Transition a device to a new power state, using the Power Management
384 * Capabilities in the device's config space.
387 * -EINVAL if trying to enter a lower state than we're already in.
388 * 0 if we're already in the requested state.
389 * -EIO if device does not support PCI PM.
390 * 0 if we can successfully change the power state.
393 pci_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
395 int pm
, need_restore
= 0;
398 /* bound the state we're entering */
399 if (state
> PCI_D3hot
)
403 * If the device or the parent bridge can't support PCI PM, ignore
404 * the request if we're doing anything besides putting it into D0
405 * (which would only happen on boot).
407 if ((state
== PCI_D1
|| state
== PCI_D2
) && pci_no_d1d2(dev
))
410 /* Validate current state:
411 * Can enter D0 from any state, but if we can only go deeper
412 * to sleep if we're already in a low power state
414 if (state
!= PCI_D0
&& dev
->current_state
> state
) {
415 printk(KERN_ERR
"%s(): %s: state=%d, current state=%d\n",
416 __FUNCTION__
, pci_name(dev
), state
, dev
->current_state
);
418 } else if (dev
->current_state
== state
)
419 return 0; /* we're already there */
422 /* find PCI PM capability in list */
423 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
425 /* abort if the device doesn't support PM capabilities */
429 pci_read_config_word(dev
,pm
+ PCI_PM_PMC
,&pmc
);
430 if ((pmc
& PCI_PM_CAP_VER_MASK
) > 3) {
432 "PCI: %s has unsupported PM cap regs version (%u)\n",
433 pci_name(dev
), pmc
& PCI_PM_CAP_VER_MASK
);
437 /* check if this device supports the desired state */
438 if (state
== PCI_D1
&& !(pmc
& PCI_PM_CAP_D1
))
440 else if (state
== PCI_D2
&& !(pmc
& PCI_PM_CAP_D2
))
443 pci_read_config_word(dev
, pm
+ PCI_PM_CTRL
, &pmcsr
);
445 /* If we're (effectively) in D3, force entire word to 0.
446 * This doesn't affect PME_Status, disables PME_En, and
447 * sets PowerState to 0.
449 switch (dev
->current_state
) {
453 pmcsr
&= ~PCI_PM_CTRL_STATE_MASK
;
456 case PCI_UNKNOWN
: /* Boot-up */
457 if ((pmcsr
& PCI_PM_CTRL_STATE_MASK
) == PCI_D3hot
458 && !(pmcsr
& PCI_PM_CTRL_NO_SOFT_RESET
))
460 /* Fall-through: force to D0 */
466 /* enter specified state */
467 pci_write_config_word(dev
, pm
+ PCI_PM_CTRL
, pmcsr
);
469 /* Mandatory power management transition delays */
470 /* see PCI PM 1.1 5.6.1 table 18 */
471 if (state
== PCI_D3hot
|| dev
->current_state
== PCI_D3hot
)
472 msleep(pci_pm_d3_delay
);
473 else if (state
== PCI_D2
|| dev
->current_state
== PCI_D2
)
477 * Give firmware a chance to be called, such as ACPI _PRx, _PSx
478 * Firmware method after native method ?
480 if (platform_pci_set_power_state
)
481 platform_pci_set_power_state(dev
, state
);
483 dev
->current_state
= state
;
485 /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
486 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
487 * from D3hot to D0 _may_ perform an internal reset, thereby
488 * going to "D0 Uninitialized" rather than "D0 Initialized".
489 * For example, at least some versions of the 3c905B and the
490 * 3c556B exhibit this behaviour.
492 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
493 * devices in a D3hot state at boot. Consequently, we need to
494 * restore at least the BARs so that the device will be
495 * accessible to its driver.
498 pci_restore_bars(dev
);
503 int (*platform_pci_choose_state
)(struct pci_dev
*dev
, pm_message_t state
);
506 * pci_choose_state - Choose the power state of a PCI device
507 * @dev: PCI device to be suspended
508 * @state: target sleep state for the whole system. This is the value
509 * that is passed to suspend() function.
511 * Returns PCI power state suitable for given device and given system
515 pci_power_t
pci_choose_state(struct pci_dev
*dev
, pm_message_t state
)
519 if (!pci_find_capability(dev
, PCI_CAP_ID_PM
))
522 if (platform_pci_choose_state
) {
523 ret
= platform_pci_choose_state(dev
, state
);
528 switch (state
.event
) {
531 case PM_EVENT_FREEZE
:
532 case PM_EVENT_PRETHAW
:
533 /* REVISIT both freeze and pre-thaw "should" use D0 */
534 case PM_EVENT_SUSPEND
:
537 printk("Unrecognized suspend event %d\n", state
.event
);
543 EXPORT_SYMBOL(pci_choose_state
);
545 static int pci_save_pcie_state(struct pci_dev
*dev
)
548 struct pci_cap_saved_state
*save_state
;
551 pos
= pci_find_capability(dev
, PCI_CAP_ID_EXP
);
555 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
557 save_state
= kzalloc(sizeof(*save_state
) + sizeof(u16
) * 4, GFP_KERNEL
);
559 dev_err(&dev
->dev
, "Out of memory in pci_save_pcie_state\n");
562 cap
= (u16
*)&save_state
->data
[0];
564 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, &cap
[i
++]);
565 pci_read_config_word(dev
, pos
+ PCI_EXP_LNKCTL
, &cap
[i
++]);
566 pci_read_config_word(dev
, pos
+ PCI_EXP_SLTCTL
, &cap
[i
++]);
567 pci_read_config_word(dev
, pos
+ PCI_EXP_RTCTL
, &cap
[i
++]);
568 pci_add_saved_cap(dev
, save_state
);
572 static void pci_restore_pcie_state(struct pci_dev
*dev
)
575 struct pci_cap_saved_state
*save_state
;
578 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
579 pos
= pci_find_capability(dev
, PCI_CAP_ID_EXP
);
580 if (!save_state
|| pos
<= 0)
582 cap
= (u16
*)&save_state
->data
[0];
584 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, cap
[i
++]);
585 pci_write_config_word(dev
, pos
+ PCI_EXP_LNKCTL
, cap
[i
++]);
586 pci_write_config_word(dev
, pos
+ PCI_EXP_SLTCTL
, cap
[i
++]);
587 pci_write_config_word(dev
, pos
+ PCI_EXP_RTCTL
, cap
[i
++]);
591 static int pci_save_pcix_state(struct pci_dev
*dev
)
594 struct pci_cap_saved_state
*save_state
;
597 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
601 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
603 save_state
= kzalloc(sizeof(*save_state
) + sizeof(u16
), GFP_KERNEL
);
605 dev_err(&dev
->dev
, "Out of memory in pci_save_pcie_state\n");
608 cap
= (u16
*)&save_state
->data
[0];
610 pci_read_config_word(dev
, pos
+ PCI_X_CMD
, &cap
[i
++]);
611 pci_add_saved_cap(dev
, save_state
);
615 static void pci_restore_pcix_state(struct pci_dev
*dev
)
618 struct pci_cap_saved_state
*save_state
;
621 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
622 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
623 if (!save_state
|| pos
<= 0)
625 cap
= (u16
*)&save_state
->data
[0];
627 pci_write_config_word(dev
, pos
+ PCI_X_CMD
, cap
[i
++]);
632 * pci_save_state - save the PCI configuration space of a device before suspending
633 * @dev: - PCI device that we're dealing with
636 pci_save_state(struct pci_dev
*dev
)
639 /* XXX: 100% dword access ok here? */
640 for (i
= 0; i
< 16; i
++)
641 pci_read_config_dword(dev
, i
* 4,&dev
->saved_config_space
[i
]);
642 if ((i
= pci_save_pcie_state(dev
)) != 0)
644 if ((i
= pci_save_pcix_state(dev
)) != 0)
650 * pci_restore_state - Restore the saved state of a PCI device
651 * @dev: - PCI device that we're dealing with
654 pci_restore_state(struct pci_dev
*dev
)
659 /* PCI Express register must be restored first */
660 pci_restore_pcie_state(dev
);
663 * The Base Address register should be programmed before the command
666 for (i
= 15; i
>= 0; i
--) {
667 pci_read_config_dword(dev
, i
* 4, &val
);
668 if (val
!= dev
->saved_config_space
[i
]) {
669 printk(KERN_DEBUG
"PM: Writing back config space on "
670 "device %s at offset %x (was %x, writing %x)\n",
672 val
, (int)dev
->saved_config_space
[i
]);
673 pci_write_config_dword(dev
,i
* 4,
674 dev
->saved_config_space
[i
]);
677 pci_restore_pcix_state(dev
);
678 pci_restore_msi_state(dev
);
683 static int do_pci_enable_device(struct pci_dev
*dev
, int bars
)
687 err
= pci_set_power_state(dev
, PCI_D0
);
688 if (err
< 0 && err
!= -EIO
)
690 err
= pcibios_enable_device(dev
, bars
);
693 pci_fixup_device(pci_fixup_enable
, dev
);
699 * __pci_reenable_device - Resume abandoned device
700 * @dev: PCI device to be resumed
702 * Note this function is a backend of pci_default_resume and is not supposed
703 * to be called by normal code, write proper resume handler and use it instead.
706 __pci_reenable_device(struct pci_dev
*dev
)
708 if (atomic_read(&dev
->enable_cnt
))
709 return do_pci_enable_device(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
714 * pci_enable_device_bars - Initialize some of a device for use
715 * @dev: PCI device to be initialized
716 * @bars: bitmask of BAR's that must be configured
718 * Initialize device before it's used by a driver. Ask low-level code
719 * to enable selected I/O and memory resources. Wake up the device if it
720 * was suspended. Beware, this function can fail.
723 pci_enable_device_bars(struct pci_dev
*dev
, int bars
)
727 if (atomic_add_return(1, &dev
->enable_cnt
) > 1)
728 return 0; /* already enabled */
730 err
= do_pci_enable_device(dev
, bars
);
732 atomic_dec(&dev
->enable_cnt
);
737 * pci_enable_device - Initialize device before it's used by a driver.
738 * @dev: PCI device to be initialized
740 * Initialize device before it's used by a driver. Ask low-level code
741 * to enable I/O and memory. Wake up the device if it was suspended.
742 * Beware, this function can fail.
744 * Note we don't actually enable the device many times if we call
745 * this function repeatedly (we just increment the count).
747 int pci_enable_device(struct pci_dev
*dev
)
749 return pci_enable_device_bars(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
753 * Managed PCI resources. This manages device on/off, intx/msi/msix
754 * on/off and BAR regions. pci_dev itself records msi/msix status, so
755 * there's no need to track it separately. pci_devres is initialized
756 * when a device is enabled using managed PCI device enable interface.
759 unsigned int enabled
:1;
760 unsigned int pinned
: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
);
784 if (this->enabled
&& !this->pinned
)
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
->enabled
);
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
->enabled
);
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 PCI device as wakeup event source
896 * @dev: PCI device affected
897 * @state: PCI state from which device will issue wakeup events
898 * @enable: True to enable event generation; false to disable
900 * This enables the device as a wakeup event source, or disables it.
901 * When such events involves platform-specific hooks, those hooks are
902 * called automatically by this routine.
904 * Devices with legacy power management (no standard PCI PM capabilities)
905 * always require such platform hooks. Depending on the platform, devices
906 * supporting the standard PCI PME# signal may require such platform hooks;
907 * they always update bits in config space to allow PME# generation.
909 * -EIO is returned if the device can't ever be a wakeup event source.
910 * -EINVAL is returned if the device can't generate wakeup events from
911 * the specified PCI state. Returns zero if the operation is successful.
913 int pci_enable_wake(struct pci_dev
*dev
, pci_power_t state
, int enable
)
919 /* Note that drivers should verify device_may_wakeup(&dev->dev)
920 * before calling this function. Platform code should report
921 * errors when drivers try to enable wakeup on devices that
922 * can't issue wakeups, or on which wakeups were disabled by
923 * userspace updating the /sys/devices.../power/wakeup file.
926 status
= call_platform_enable_wakeup(&dev
->dev
, enable
);
928 /* find PCI PM capability in list */
929 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
931 /* If device doesn't support PM Capabilities, but caller wants to
932 * disable wake events, it's a NOP. Otherwise fail unless the
933 * platform hooks handled this legacy device already.
936 return enable
? status
: 0;
938 /* Check device's ability to generate PME# */
939 pci_read_config_word(dev
,pm
+PCI_PM_PMC
,&value
);
941 value
&= PCI_PM_CAP_PME_MASK
;
942 value
>>= ffs(PCI_PM_CAP_PME_MASK
) - 1; /* First bit of mask */
944 /* Check if it can generate PME# from requested state. */
945 if (!value
|| !(value
& (1 << state
))) {
946 /* if it can't, revert what the platform hook changed,
947 * always reporting the base "EINVAL, can't PME#" error
950 call_platform_enable_wakeup(&dev
->dev
, 0);
951 return enable
? -EINVAL
: 0;
954 pci_read_config_word(dev
, pm
+ PCI_PM_CTRL
, &value
);
956 /* Clear PME_Status by writing 1 to it and enable PME# */
957 value
|= PCI_PM_CTRL_PME_STATUS
| PCI_PM_CTRL_PME_ENABLE
;
960 value
&= ~PCI_PM_CTRL_PME_ENABLE
;
962 pci_write_config_word(dev
, pm
+ PCI_PM_CTRL
, value
);
968 pci_get_interrupt_pin(struct pci_dev
*dev
, struct pci_dev
**bridge
)
976 while (dev
->bus
->self
) {
977 pin
= (pin
+ PCI_SLOT(dev
->devfn
)) % 4;
978 dev
= dev
->bus
->self
;
985 * pci_release_region - Release a PCI bar
986 * @pdev: PCI device whose resources were previously reserved by pci_request_region
987 * @bar: BAR to release
989 * Releases the PCI I/O and memory resources previously reserved by a
990 * successful call to pci_request_region. Call this function only
991 * after all use of the PCI regions has ceased.
993 void pci_release_region(struct pci_dev
*pdev
, int bar
)
995 struct pci_devres
*dr
;
997 if (pci_resource_len(pdev
, bar
) == 0)
999 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
1000 release_region(pci_resource_start(pdev
, bar
),
1001 pci_resource_len(pdev
, bar
));
1002 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
1003 release_mem_region(pci_resource_start(pdev
, bar
),
1004 pci_resource_len(pdev
, bar
));
1006 dr
= find_pci_dr(pdev
);
1008 dr
->region_mask
&= ~(1 << bar
);
1012 * pci_request_region - Reserved PCI I/O and memory resource
1013 * @pdev: PCI device whose resources are to be reserved
1014 * @bar: BAR to be reserved
1015 * @res_name: Name to be associated with resource.
1017 * Mark the PCI region associated with PCI device @pdev BR @bar as
1018 * being reserved by owner @res_name. Do not access any
1019 * address inside the PCI regions unless this call returns
1022 * Returns 0 on success, or %EBUSY on error. A warning
1023 * message is also printed on failure.
1025 int pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
)
1027 struct pci_devres
*dr
;
1029 if (pci_resource_len(pdev
, bar
) == 0)
1032 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
) {
1033 if (!request_region(pci_resource_start(pdev
, bar
),
1034 pci_resource_len(pdev
, bar
), res_name
))
1037 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
) {
1038 if (!request_mem_region(pci_resource_start(pdev
, bar
),
1039 pci_resource_len(pdev
, bar
), res_name
))
1043 dr
= find_pci_dr(pdev
);
1045 dr
->region_mask
|= 1 << bar
;
1050 printk (KERN_WARNING
"PCI: Unable to reserve %s region #%d:%llx@%llx "
1052 pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
? "I/O" : "mem",
1053 bar
+ 1, /* PCI BAR # */
1054 (unsigned long long)pci_resource_len(pdev
, bar
),
1055 (unsigned long long)pci_resource_start(pdev
, bar
),
1061 * pci_release_selected_regions - Release selected PCI I/O and memory resources
1062 * @pdev: PCI device whose resources were previously reserved
1063 * @bars: Bitmask of BARs to be released
1065 * Release selected PCI I/O and memory resources previously reserved.
1066 * Call this function only after all use of the PCI regions has ceased.
1068 void pci_release_selected_regions(struct pci_dev
*pdev
, int bars
)
1072 for (i
= 0; i
< 6; i
++)
1073 if (bars
& (1 << i
))
1074 pci_release_region(pdev
, i
);
1078 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
1079 * @pdev: PCI device whose resources are to be reserved
1080 * @bars: Bitmask of BARs to be requested
1081 * @res_name: Name to be associated with resource
1083 int pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
1084 const char *res_name
)
1088 for (i
= 0; i
< 6; i
++)
1089 if (bars
& (1 << i
))
1090 if(pci_request_region(pdev
, i
, res_name
))
1096 if (bars
& (1 << i
))
1097 pci_release_region(pdev
, i
);
1103 * pci_release_regions - Release reserved PCI I/O and memory resources
1104 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
1106 * Releases all PCI I/O and memory resources previously reserved by a
1107 * successful call to pci_request_regions. Call this function only
1108 * after all use of the PCI regions has ceased.
1111 void pci_release_regions(struct pci_dev
*pdev
)
1113 pci_release_selected_regions(pdev
, (1 << 6) - 1);
1117 * pci_request_regions - Reserved PCI I/O and memory resources
1118 * @pdev: PCI device whose resources are to be reserved
1119 * @res_name: Name to be associated with resource.
1121 * Mark all PCI regions associated with PCI device @pdev as
1122 * being reserved by owner @res_name. Do not access any
1123 * address inside the PCI regions unless this call returns
1126 * Returns 0 on success, or %EBUSY on error. A warning
1127 * message is also printed on failure.
1129 int pci_request_regions(struct pci_dev
*pdev
, const char *res_name
)
1131 return pci_request_selected_regions(pdev
, ((1 << 6) - 1), res_name
);
1135 * pci_set_master - enables bus-mastering for device dev
1136 * @dev: the PCI device to enable
1138 * Enables bus-mastering on the device and calls pcibios_set_master()
1139 * to do the needed arch specific settings.
1142 pci_set_master(struct pci_dev
*dev
)
1146 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1147 if (! (cmd
& PCI_COMMAND_MASTER
)) {
1148 pr_debug("PCI: Enabling bus mastering for device %s\n", pci_name(dev
));
1149 cmd
|= PCI_COMMAND_MASTER
;
1150 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
1152 dev
->is_busmaster
= 1;
1153 pcibios_set_master(dev
);
1156 #ifdef PCI_DISABLE_MWI
1157 int pci_set_mwi(struct pci_dev
*dev
)
1162 void pci_clear_mwi(struct pci_dev
*dev
)
1168 #ifndef PCI_CACHE_LINE_BYTES
1169 #define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES
1172 /* This can be overridden by arch code. */
1173 /* Don't forget this is measured in 32-bit words, not bytes */
1174 u8 pci_cache_line_size
= PCI_CACHE_LINE_BYTES
/ 4;
1177 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
1178 * @dev: the PCI device for which MWI is to be enabled
1180 * Helper function for pci_set_mwi.
1181 * Originally copied from drivers/net/acenic.c.
1182 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
1184 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1187 pci_set_cacheline_size(struct pci_dev
*dev
)
1191 if (!pci_cache_line_size
)
1192 return -EINVAL
; /* The system doesn't support MWI. */
1194 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
1195 equal to or multiple of the right value. */
1196 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
1197 if (cacheline_size
>= pci_cache_line_size
&&
1198 (cacheline_size
% pci_cache_line_size
) == 0)
1201 /* Write the correct value. */
1202 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
, pci_cache_line_size
);
1204 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
1205 if (cacheline_size
== pci_cache_line_size
)
1208 printk(KERN_DEBUG
"PCI: cache line size of %d is not supported "
1209 "by device %s\n", pci_cache_line_size
<< 2, pci_name(dev
));
1215 * pci_set_mwi - enables memory-write-invalidate PCI transaction
1216 * @dev: the PCI device for which MWI is enabled
1218 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND,
1219 * and then calls @pcibios_set_mwi to do the needed arch specific
1220 * operations or a generic mwi-prep function.
1222 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1225 pci_set_mwi(struct pci_dev
*dev
)
1230 rc
= pci_set_cacheline_size(dev
);
1234 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1235 if (! (cmd
& PCI_COMMAND_INVALIDATE
)) {
1236 pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n", pci_name(dev
));
1237 cmd
|= PCI_COMMAND_INVALIDATE
;
1238 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
1245 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
1246 * @dev: the PCI device to disable
1248 * Disables PCI Memory-Write-Invalidate transaction on the device
1251 pci_clear_mwi(struct pci_dev
*dev
)
1255 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1256 if (cmd
& PCI_COMMAND_INVALIDATE
) {
1257 cmd
&= ~PCI_COMMAND_INVALIDATE
;
1258 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
1261 #endif /* ! PCI_DISABLE_MWI */
1264 * pci_intx - enables/disables PCI INTx for device dev
1265 * @pdev: the PCI device to operate on
1266 * @enable: boolean: whether to enable or disable PCI INTx
1268 * Enables/disables PCI INTx for device dev
1271 pci_intx(struct pci_dev
*pdev
, int enable
)
1273 u16 pci_command
, new;
1275 pci_read_config_word(pdev
, PCI_COMMAND
, &pci_command
);
1278 new = pci_command
& ~PCI_COMMAND_INTX_DISABLE
;
1280 new = pci_command
| PCI_COMMAND_INTX_DISABLE
;
1283 if (new != pci_command
) {
1284 struct pci_devres
*dr
;
1286 pci_write_config_word(pdev
, PCI_COMMAND
, new);
1288 dr
= find_pci_dr(pdev
);
1289 if (dr
&& !dr
->restore_intx
) {
1290 dr
->restore_intx
= 1;
1291 dr
->orig_intx
= !enable
;
1297 * pci_msi_off - disables any msi or msix capabilities
1298 * @pdev: the PCI device to operate on
1300 * If you want to use msi see pci_enable_msi and friends.
1301 * This is a lower level primitive that allows us to disable
1302 * msi operation at the device level.
1304 void pci_msi_off(struct pci_dev
*dev
)
1309 pos
= pci_find_capability(dev
, PCI_CAP_ID_MSI
);
1311 pci_read_config_word(dev
, pos
+ PCI_MSI_FLAGS
, &control
);
1312 control
&= ~PCI_MSI_FLAGS_ENABLE
;
1313 pci_write_config_word(dev
, pos
+ PCI_MSI_FLAGS
, control
);
1315 pos
= pci_find_capability(dev
, PCI_CAP_ID_MSIX
);
1317 pci_read_config_word(dev
, pos
+ PCI_MSIX_FLAGS
, &control
);
1318 control
&= ~PCI_MSIX_FLAGS_ENABLE
;
1319 pci_write_config_word(dev
, pos
+ PCI_MSIX_FLAGS
, control
);
1323 #ifndef HAVE_ARCH_PCI_SET_DMA_MASK
1325 * These can be overridden by arch-specific implementations
1328 pci_set_dma_mask(struct pci_dev
*dev
, u64 mask
)
1330 if (!pci_dma_supported(dev
, mask
))
1333 dev
->dma_mask
= mask
;
1339 pci_set_consistent_dma_mask(struct pci_dev
*dev
, u64 mask
)
1341 if (!pci_dma_supported(dev
, mask
))
1344 dev
->dev
.coherent_dma_mask
= mask
;
1351 * pci_select_bars - Make BAR mask from the type of resource
1352 * @dev: the PCI device for which BAR mask is made
1353 * @flags: resource type mask to be selected
1355 * This helper routine makes bar mask from the type of resource.
1357 int pci_select_bars(struct pci_dev
*dev
, unsigned long flags
)
1360 for (i
= 0; i
< PCI_NUM_RESOURCES
; i
++)
1361 if (pci_resource_flags(dev
, i
) & flags
)
1366 static int __devinit
pci_init(void)
1368 struct pci_dev
*dev
= NULL
;
1370 while ((dev
= pci_get_device(PCI_ANY_ID
, PCI_ANY_ID
, dev
)) != NULL
) {
1371 pci_fixup_device(pci_fixup_final
, dev
);
1376 static int __devinit
pci_setup(char *str
)
1379 char *k
= strchr(str
, ',');
1382 if (*str
&& (str
= pcibios_setup(str
)) && *str
) {
1383 if (!strcmp(str
, "nomsi")) {
1385 } else if (!strncmp(str
, "cbiosize=", 9)) {
1386 pci_cardbus_io_size
= memparse(str
+ 9, &str
);
1387 } else if (!strncmp(str
, "cbmemsize=", 10)) {
1388 pci_cardbus_mem_size
= memparse(str
+ 10, &str
);
1390 printk(KERN_ERR
"PCI: Unknown option `%s'\n",
1398 early_param("pci", pci_setup
);
1400 device_initcall(pci_init
);
1402 EXPORT_SYMBOL_GPL(pci_restore_bars
);
1403 EXPORT_SYMBOL(pci_enable_device_bars
);
1404 EXPORT_SYMBOL(pci_enable_device
);
1405 EXPORT_SYMBOL(pcim_enable_device
);
1406 EXPORT_SYMBOL(pcim_pin_device
);
1407 EXPORT_SYMBOL(pci_disable_device
);
1408 EXPORT_SYMBOL(pci_find_capability
);
1409 EXPORT_SYMBOL(pci_bus_find_capability
);
1410 EXPORT_SYMBOL(pci_release_regions
);
1411 EXPORT_SYMBOL(pci_request_regions
);
1412 EXPORT_SYMBOL(pci_release_region
);
1413 EXPORT_SYMBOL(pci_request_region
);
1414 EXPORT_SYMBOL(pci_release_selected_regions
);
1415 EXPORT_SYMBOL(pci_request_selected_regions
);
1416 EXPORT_SYMBOL(pci_set_master
);
1417 EXPORT_SYMBOL(pci_set_mwi
);
1418 EXPORT_SYMBOL(pci_clear_mwi
);
1419 EXPORT_SYMBOL_GPL(pci_intx
);
1420 EXPORT_SYMBOL(pci_set_dma_mask
);
1421 EXPORT_SYMBOL(pci_set_consistent_dma_mask
);
1422 EXPORT_SYMBOL(pci_assign_resource
);
1423 EXPORT_SYMBOL(pci_find_parent_resource
);
1424 EXPORT_SYMBOL(pci_select_bars
);
1426 EXPORT_SYMBOL(pci_set_power_state
);
1427 EXPORT_SYMBOL(pci_save_state
);
1428 EXPORT_SYMBOL(pci_restore_state
);
1429 EXPORT_SYMBOL(pci_enable_wake
);