linux-hardened/drivers/pci/pci.c

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/*
* PCI Bus Services, see include/linux/pci.h for further explanation.
*
* Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
* David Mosberger-Tang
*
* Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz>
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/log2.h>
#include <linux/pci-aspm.h>
#include <linux/pm_wakeup.h>
#include <linux/interrupt.h>
#include <asm/dma.h> /* isa_dma_bridge_buggy */
#include "pci.h"
unsigned int pci_pm_d3_delay = 10;
#ifdef CONFIG_PCI_DOMAINS
int pci_domains_supported = 1;
#endif
#define DEFAULT_CARDBUS_IO_SIZE (256)
#define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
/* pci=cbmemsize=nnM,cbiosize=nn can override this */
unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE;
unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE;
/**
* pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
* @bus: pointer to PCI bus structure to search
*
* Given a PCI bus, returns the highest PCI bus number present in the set
* including the given PCI bus and its list of child PCI buses.
*/
pci: do not mark exported functions as __devinit Functions marked __devinit will be removed after kernel init. But being exported they are potentially called by a module much later. So the safer choice seems to be to keep the function even in the non CONFIG_HOTPLUG case. This silence the follwoing section mismatch warnings: WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_add_device from __ksymtab_gpl between '__ksymtab_pci_bus_add_device' (at offset 0x20) and '__ksymtab_pci_walk_bus' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_create_bus from __ksymtab_gpl between '__ksymtab_pci_create_bus' (at offset 0x40) and '__ksymtab_pci_stop_bus_device' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_max_busnr from __ksymtab_gpl between '__ksymtab_pci_bus_max_busnr' (at offset 0xc0) and '__ksymtab_pci_assign_resource_fixed' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_claim_resource from __ksymtab_gpl between '__ksymtab_pci_claim_resource' (at offset 0xe0) and '__ksymtab_pcie_port_bus_type' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_add_devices from __ksymtab between '__ksymtab_pci_bus_add_devices' (at offset 0x70) and '__ksymtab_pci_bus_alloc_resource' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_scan_bus_parented from __ksymtab between '__ksymtab_pci_scan_bus_parented' (at offset 0x90) and '__ksymtab_pci_root_buses' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_assign_resources from __ksymtab between '__ksymtab_pci_bus_assign_resources' (at offset 0x4d0) and '__ksymtab_pci_bus_size_bridges' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_size_bridges from __ksymtab between '__ksymtab_pci_bus_size_bridges' (at offset 0x4e0) and '__ksymtab_pci_setup_cardbus' Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-03-27 07:53:30 +02:00
unsigned char pci_bus_max_busnr(struct pci_bus* bus)
{
struct list_head *tmp;
unsigned char max, n;
max = bus->subordinate;
list_for_each(tmp, &bus->children) {
n = pci_bus_max_busnr(pci_bus_b(tmp));
if(n > max)
max = n;
}
return max;
}
EXPORT_SYMBOL_GPL(pci_bus_max_busnr);
#ifdef CONFIG_HAS_IOMEM
void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
{
/*
* Make sure the BAR is actually a memory resource, not an IO resource
*/
if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
WARN_ON(1);
return NULL;
}
return ioremap_nocache(pci_resource_start(pdev, bar),
pci_resource_len(pdev, bar));
}
EXPORT_SYMBOL_GPL(pci_ioremap_bar);
#endif
#if 0
/**
* pci_max_busnr - returns maximum PCI bus number
*
* Returns the highest PCI bus number present in the system global list of
* PCI buses.
*/
unsigned char __devinit
pci_max_busnr(void)
{
struct pci_bus *bus = NULL;
unsigned char max, n;
max = 0;
while ((bus = pci_find_next_bus(bus)) != NULL) {
n = pci_bus_max_busnr(bus);
if(n > max)
max = n;
}
return max;
}
#endif /* 0 */
#define PCI_FIND_CAP_TTL 48
static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn,
u8 pos, int cap, int *ttl)
{
u8 id;
while ((*ttl)--) {
pci_bus_read_config_byte(bus, devfn, pos, &pos);
if (pos < 0x40)
break;
pos &= ~3;
pci_bus_read_config_byte(bus, devfn, pos + PCI_CAP_LIST_ID,
&id);
if (id == 0xff)
break;
if (id == cap)
return pos;
pos += PCI_CAP_LIST_NEXT;
}
return 0;
}
static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn,
u8 pos, int cap)
{
int ttl = PCI_FIND_CAP_TTL;
return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl);
}
int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap)
{
return __pci_find_next_cap(dev->bus, dev->devfn,
pos + PCI_CAP_LIST_NEXT, cap);
}
EXPORT_SYMBOL_GPL(pci_find_next_capability);
static int __pci_bus_find_cap_start(struct pci_bus *bus,
unsigned int devfn, u8 hdr_type)
{
u16 status;
pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status);
if (!(status & PCI_STATUS_CAP_LIST))
return 0;
switch (hdr_type) {
case PCI_HEADER_TYPE_NORMAL:
case PCI_HEADER_TYPE_BRIDGE:
return PCI_CAPABILITY_LIST;
case PCI_HEADER_TYPE_CARDBUS:
return PCI_CB_CAPABILITY_LIST;
default:
return 0;
}
return 0;
}
/**
* pci_find_capability - query for devices' capabilities
* @dev: PCI device to query
* @cap: capability code
*
* Tell if a device supports a given PCI capability.
* Returns the address of the requested capability structure within the
* device's PCI configuration space or 0 in case the device does not
* support it. Possible values for @cap:
*
* %PCI_CAP_ID_PM Power Management
* %PCI_CAP_ID_AGP Accelerated Graphics Port
* %PCI_CAP_ID_VPD Vital Product Data
* %PCI_CAP_ID_SLOTID Slot Identification
* %PCI_CAP_ID_MSI Message Signalled Interrupts
* %PCI_CAP_ID_CHSWP CompactPCI HotSwap
* %PCI_CAP_ID_PCIX PCI-X
* %PCI_CAP_ID_EXP PCI Express
*/
int pci_find_capability(struct pci_dev *dev, int cap)
{
int pos;
pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
if (pos)
pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap);
return pos;
}
/**
* pci_bus_find_capability - query for devices' capabilities
* @bus: the PCI bus to query
* @devfn: PCI device to query
* @cap: capability code
*
* Like pci_find_capability() but works for pci devices that do not have a
* pci_dev structure set up yet.
*
* Returns the address of the requested capability structure within the
* device's PCI configuration space or 0 in case the device does not
* support it.
*/
int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap)
{
int pos;
u8 hdr_type;
pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type);
pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f);
if (pos)
pos = __pci_find_next_cap(bus, devfn, pos, cap);
return pos;
}
/**
* pci_find_ext_capability - Find an extended capability
* @dev: PCI device to query
* @cap: capability code
*
* Returns the address of the requested extended capability structure
* within the device's PCI configuration space or 0 if the device does
* not support it. Possible values for @cap:
*
* %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
* %PCI_EXT_CAP_ID_VC Virtual Channel
* %PCI_EXT_CAP_ID_DSN Device Serial Number
* %PCI_EXT_CAP_ID_PWR Power Budgeting
*/
int pci_find_ext_capability(struct pci_dev *dev, int cap)
{
u32 header;
int ttl;
int pos = PCI_CFG_SPACE_SIZE;
/* minimum 8 bytes per capability */
ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
if (dev->cfg_size <= PCI_CFG_SPACE_SIZE)
return 0;
if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
return 0;
/*
* If we have no capabilities, this is indicated by cap ID,
* cap version and next pointer all being 0.
*/
if (header == 0)
return 0;
while (ttl-- > 0) {
if (PCI_EXT_CAP_ID(header) == cap)
return pos;
pos = PCI_EXT_CAP_NEXT(header);
if (pos < PCI_CFG_SPACE_SIZE)
break;
if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
break;
}
return 0;
}
EXPORT_SYMBOL_GPL(pci_find_ext_capability);
static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap)
{
int rc, ttl = PCI_FIND_CAP_TTL;
u8 cap, mask;
if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST)
mask = HT_3BIT_CAP_MASK;
else
mask = HT_5BIT_CAP_MASK;
pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos,
PCI_CAP_ID_HT, &ttl);
while (pos) {
rc = pci_read_config_byte(dev, pos + 3, &cap);
if (rc != PCIBIOS_SUCCESSFUL)
return 0;
if ((cap & mask) == ht_cap)
return pos;
pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn,
pos + PCI_CAP_LIST_NEXT,
PCI_CAP_ID_HT, &ttl);
}
return 0;
}
/**
* pci_find_next_ht_capability - query a device's Hypertransport capabilities
* @dev: PCI device to query
* @pos: Position from which to continue searching
* @ht_cap: Hypertransport capability code
*
* To be used in conjunction with pci_find_ht_capability() to search for
* all capabilities matching @ht_cap. @pos should always be a value returned
* from pci_find_ht_capability().
*
* NB. To be 100% safe against broken PCI devices, the caller should take
* steps to avoid an infinite loop.
*/
int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap)
{
return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap);
}
EXPORT_SYMBOL_GPL(pci_find_next_ht_capability);
/**
* pci_find_ht_capability - query a device's Hypertransport capabilities
* @dev: PCI device to query
* @ht_cap: Hypertransport capability code
*
* Tell if a device supports a given Hypertransport capability.
* Returns an address within the device's PCI configuration space
* or 0 in case the device does not support the request capability.
* The address points to the PCI capability, of type PCI_CAP_ID_HT,
* which has a Hypertransport capability matching @ht_cap.
*/
int pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
{
int pos;
pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
if (pos)
pos = __pci_find_next_ht_cap(dev, pos, ht_cap);
return pos;
}
EXPORT_SYMBOL_GPL(pci_find_ht_capability);
/**
* pci_find_parent_resource - return resource region of parent bus of given region
* @dev: PCI device structure contains resources to be searched
* @res: child resource record for which parent is sought
*
* For given resource region of given device, return the resource
* region of parent bus the given region is contained in or where
* it should be allocated from.
*/
struct resource *
pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
{
const struct pci_bus *bus = dev->bus;
int i;
struct resource *best = NULL;
for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
struct resource *r = bus->resource[i];
if (!r)
continue;
if (res->start && !(res->start >= r->start && res->end <= r->end))
continue; /* Not contained */
if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM))
continue; /* Wrong type */
if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH))
return r; /* Exact match */
if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH))
best = r; /* Approximating prefetchable by non-prefetchable */
}
return best;
}
[PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration (including BARs) when transitioning from D3hot->D0. This leaves such a device in an inaccessible state. The patch below causes the BARs to be restored when enabling such a device, so that its driver will be able to access it. The patch also adds pci_restore_bars as a new global symbol, and adds a correpsonding EXPORT_SYMBOL_GPL for that. Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a (re)boot. Most drivers call pci_enable_device very early, so devices left in D3hot that lose configuration during the D3hot->D0 transition will be inaccessible to their drivers. Drivers could be modified to account for this, but it would be difficult to know which drivers need modification. This is especially true since often many devices are covered by the same driver. It likely would be necessary to replicate code across dozens of drivers. The patch below should trigger only when transitioning from D3hot->D0 (or at boot), and only for devices that have the "no soft reset" bit cleared in the PM control register. I believe it is safe to include this patch as part of the PCI infrastructure. The cleanest implementation of pci_restore_bars was to call pci_update_resource. Unfortunately, that does not currently exist for the sparc64 architecture. The patch below includes a null implemenation of pci_update_resource for sparc64. Some have expressed interest in making general use of the the pci_restore_bars function, so that has been exported to GPL licensed modules. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-07-27 16:19:44 +02:00
/**
* pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
* @dev: PCI device to have its BARs restored
*
* Restore the BAR values for a given device, so as to make it
* accessible by its driver.
*/
static void
[PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration (including BARs) when transitioning from D3hot->D0. This leaves such a device in an inaccessible state. The patch below causes the BARs to be restored when enabling such a device, so that its driver will be able to access it. The patch also adds pci_restore_bars as a new global symbol, and adds a correpsonding EXPORT_SYMBOL_GPL for that. Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a (re)boot. Most drivers call pci_enable_device very early, so devices left in D3hot that lose configuration during the D3hot->D0 transition will be inaccessible to their drivers. Drivers could be modified to account for this, but it would be difficult to know which drivers need modification. This is especially true since often many devices are covered by the same driver. It likely would be necessary to replicate code across dozens of drivers. The patch below should trigger only when transitioning from D3hot->D0 (or at boot), and only for devices that have the "no soft reset" bit cleared in the PM control register. I believe it is safe to include this patch as part of the PCI infrastructure. The cleanest implementation of pci_restore_bars was to call pci_update_resource. Unfortunately, that does not currently exist for the sparc64 architecture. The patch below includes a null implemenation of pci_update_resource for sparc64. Some have expressed interest in making general use of the the pci_restore_bars function, so that has been exported to GPL licensed modules. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-07-27 16:19:44 +02:00
pci_restore_bars(struct pci_dev *dev)
{
int i;
[PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration (including BARs) when transitioning from D3hot->D0. This leaves such a device in an inaccessible state. The patch below causes the BARs to be restored when enabling such a device, so that its driver will be able to access it. The patch also adds pci_restore_bars as a new global symbol, and adds a correpsonding EXPORT_SYMBOL_GPL for that. Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a (re)boot. Most drivers call pci_enable_device very early, so devices left in D3hot that lose configuration during the D3hot->D0 transition will be inaccessible to their drivers. Drivers could be modified to account for this, but it would be difficult to know which drivers need modification. This is especially true since often many devices are covered by the same driver. It likely would be necessary to replicate code across dozens of drivers. The patch below should trigger only when transitioning from D3hot->D0 (or at boot), and only for devices that have the "no soft reset" bit cleared in the PM control register. I believe it is safe to include this patch as part of the PCI infrastructure. The cleanest implementation of pci_restore_bars was to call pci_update_resource. Unfortunately, that does not currently exist for the sparc64 architecture. The patch below includes a null implemenation of pci_update_resource for sparc64. Some have expressed interest in making general use of the the pci_restore_bars function, so that has been exported to GPL licensed modules. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-07-27 16:19:44 +02:00
for (i = 0; i < PCI_BRIDGE_RESOURCES; i++)
pci_update_resource(dev, i);
[PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration (including BARs) when transitioning from D3hot->D0. This leaves such a device in an inaccessible state. The patch below causes the BARs to be restored when enabling such a device, so that its driver will be able to access it. The patch also adds pci_restore_bars as a new global symbol, and adds a correpsonding EXPORT_SYMBOL_GPL for that. Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a (re)boot. Most drivers call pci_enable_device very early, so devices left in D3hot that lose configuration during the D3hot->D0 transition will be inaccessible to their drivers. Drivers could be modified to account for this, but it would be difficult to know which drivers need modification. This is especially true since often many devices are covered by the same driver. It likely would be necessary to replicate code across dozens of drivers. The patch below should trigger only when transitioning from D3hot->D0 (or at boot), and only for devices that have the "no soft reset" bit cleared in the PM control register. I believe it is safe to include this patch as part of the PCI infrastructure. The cleanest implementation of pci_restore_bars was to call pci_update_resource. Unfortunately, that does not currently exist for the sparc64 architecture. The patch below includes a null implemenation of pci_update_resource for sparc64. Some have expressed interest in making general use of the the pci_restore_bars function, so that has been exported to GPL licensed modules. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-07-27 16:19:44 +02:00
}
static struct pci_platform_pm_ops *pci_platform_pm;
int pci_set_platform_pm(struct pci_platform_pm_ops *ops)
{
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
if (!ops->is_manageable || !ops->set_state || !ops->choose_state
|| !ops->sleep_wake || !ops->can_wakeup)
return -EINVAL;
pci_platform_pm = ops;
return 0;
}
static inline bool platform_pci_power_manageable(struct pci_dev *dev)
{
return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false;
}
static inline int platform_pci_set_power_state(struct pci_dev *dev,
pci_power_t t)
{
return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS;
}
static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev)
{
return pci_platform_pm ?
pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR;
}
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
static inline bool platform_pci_can_wakeup(struct pci_dev *dev)
{
return pci_platform_pm ? pci_platform_pm->can_wakeup(dev) : false;
}
static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable)
{
return pci_platform_pm ?
pci_platform_pm->sleep_wake(dev, enable) : -ENODEV;
}
/**
* pci_raw_set_power_state - Use PCI PM registers to set the power state of
* given PCI device
* @dev: PCI device to handle.
* @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
*
* RETURN VALUE:
* -EINVAL if the requested state is invalid.
* -EIO if device does not support PCI PM or its PM capabilities register has a
* wrong version, or device doesn't support the requested state.
* 0 if device already is in the requested state.
* 0 if device's power state has been successfully changed.
*/
static int
pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
{
u16 pmcsr;
bool need_restore = false;
if (!dev->pm_cap)
return -EIO;
if (state < PCI_D0 || state > PCI_D3hot)
return -EINVAL;
/* Validate current state:
* Can enter D0 from any state, but if we can only go deeper
* to sleep if we're already in a low power state
*/
if (dev->current_state == state) {
/* we're already there */
return 0;
} else if (state != PCI_D0 && dev->current_state <= PCI_D3cold
&& dev->current_state > state) {
dev_err(&dev->dev, "invalid power transition "
"(from state %d to %d)\n", dev->current_state, state);
return -EINVAL;
}
/* check if this device supports the desired state */
if ((state == PCI_D1 && !dev->d1_support)
|| (state == PCI_D2 && !dev->d2_support))
return -EIO;
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
[PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration (including BARs) when transitioning from D3hot->D0. This leaves such a device in an inaccessible state. The patch below causes the BARs to be restored when enabling such a device, so that its driver will be able to access it. The patch also adds pci_restore_bars as a new global symbol, and adds a correpsonding EXPORT_SYMBOL_GPL for that. Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a (re)boot. Most drivers call pci_enable_device very early, so devices left in D3hot that lose configuration during the D3hot->D0 transition will be inaccessible to their drivers. Drivers could be modified to account for this, but it would be difficult to know which drivers need modification. This is especially true since often many devices are covered by the same driver. It likely would be necessary to replicate code across dozens of drivers. The patch below should trigger only when transitioning from D3hot->D0 (or at boot), and only for devices that have the "no soft reset" bit cleared in the PM control register. I believe it is safe to include this patch as part of the PCI infrastructure. The cleanest implementation of pci_restore_bars was to call pci_update_resource. Unfortunately, that does not currently exist for the sparc64 architecture. The patch below includes a null implemenation of pci_update_resource for sparc64. Some have expressed interest in making general use of the the pci_restore_bars function, so that has been exported to GPL licensed modules. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-07-27 16:19:44 +02:00
/* If we're (effectively) in D3, force entire word to 0.
* This doesn't affect PME_Status, disables PME_En, and
* sets PowerState to 0.
*/
switch (dev->current_state) {
case PCI_D0:
case PCI_D1:
case PCI_D2:
pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
pmcsr |= state;
break;
case PCI_UNKNOWN: /* Boot-up */
if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot
&& !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET))
need_restore = true;
/* Fall-through: force to D0 */
default:
pmcsr = 0;
break;
}
/* enter specified state */
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
/* Mandatory power management transition delays */
/* see PCI PM 1.1 5.6.1 table 18 */
if (state == PCI_D3hot || dev->current_state == PCI_D3hot)
msleep(pci_pm_d3_delay);
else if (state == PCI_D2 || dev->current_state == PCI_D2)
udelay(200);
dev->current_state = state;
[PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration (including BARs) when transitioning from D3hot->D0. This leaves such a device in an inaccessible state. The patch below causes the BARs to be restored when enabling such a device, so that its driver will be able to access it. The patch also adds pci_restore_bars as a new global symbol, and adds a correpsonding EXPORT_SYMBOL_GPL for that. Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a (re)boot. Most drivers call pci_enable_device very early, so devices left in D3hot that lose configuration during the D3hot->D0 transition will be inaccessible to their drivers. Drivers could be modified to account for this, but it would be difficult to know which drivers need modification. This is especially true since often many devices are covered by the same driver. It likely would be necessary to replicate code across dozens of drivers. The patch below should trigger only when transitioning from D3hot->D0 (or at boot), and only for devices that have the "no soft reset" bit cleared in the PM control register. I believe it is safe to include this patch as part of the PCI infrastructure. The cleanest implementation of pci_restore_bars was to call pci_update_resource. Unfortunately, that does not currently exist for the sparc64 architecture. The patch below includes a null implemenation of pci_update_resource for sparc64. Some have expressed interest in making general use of the the pci_restore_bars function, so that has been exported to GPL licensed modules. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-07-27 16:19:44 +02:00
/* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
* INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
* from D3hot to D0 _may_ perform an internal reset, thereby
* going to "D0 Uninitialized" rather than "D0 Initialized".
* For example, at least some versions of the 3c905B and the
* 3c556B exhibit this behaviour.
*
* At least some laptop BIOSen (e.g. the Thinkpad T21) leave
* devices in a D3hot state at boot. Consequently, we need to
* restore at least the BARs so that the device will be
* accessible to its driver.
*/
if (need_restore)
pci_restore_bars(dev);
if (dev->bus->self)
pcie_aspm_pm_state_change(dev->bus->self);
return 0;
}
/**
* pci_update_current_state - Read PCI power state of given device from its
* PCI PM registers and cache it
* @dev: PCI device to handle.
*/
static void pci_update_current_state(struct pci_dev *dev)
{
if (dev->pm_cap) {
u16 pmcsr;
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
}
}
/**
* pci_set_power_state - Set the power state of a PCI device
* @dev: PCI device to handle.
* @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
*
* Transition a device to a new power state, using the platform formware and/or
* the device's PCI PM registers.
*
* RETURN VALUE:
* -EINVAL if the requested state is invalid.
* -EIO if device does not support PCI PM or its PM capabilities register has a
* wrong version, or device doesn't support the requested state.
* 0 if device already is in the requested state.
* 0 if device's power state has been successfully changed.
*/
int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
int error;
/* bound the state we're entering */
if (state > PCI_D3hot)
state = PCI_D3hot;
else if (state < PCI_D0)
state = PCI_D0;
else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev))
/*
* If the device or the parent bridge do not support PCI PM,
* ignore the request if we're doing anything other than putting
* it into D0 (which would only happen on boot).
*/
return 0;
if (state == PCI_D0 && platform_pci_power_manageable(dev)) {
/*
* Allow the platform to change the state, for example via ACPI
* _PR0, _PS0 and some such, but do not trust it.
*/
int ret = platform_pci_set_power_state(dev, PCI_D0);
if (!ret)
pci_update_current_state(dev);
}
/* This device is quirked not to be put into D3, so
don't put it in D3 */
if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
return 0;
error = pci_raw_set_power_state(dev, state);
if (state > PCI_D0 && platform_pci_power_manageable(dev)) {
/* Allow the platform to finalize the transition */
int ret = platform_pci_set_power_state(dev, state);
if (!ret) {
pci_update_current_state(dev);
error = 0;
}
}
return error;
}
/**
* pci_choose_state - Choose the power state of a PCI device
* @dev: PCI device to be suspended
* @state: target sleep state for the whole system. This is the value
* that is passed to suspend() function.
*
* Returns PCI power state suitable for given device and given system
* message.
*/
pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
{
pci_power_t ret;
if (!pci_find_capability(dev, PCI_CAP_ID_PM))
return PCI_D0;
ret = platform_pci_choose_state(dev);
if (ret != PCI_POWER_ERROR)
return ret;
switch (state.event) {
case PM_EVENT_ON:
return PCI_D0;
case PM_EVENT_FREEZE:
case PM_EVENT_PRETHAW:
/* REVISIT both freeze and pre-thaw "should" use D0 */
case PM_EVENT_SUSPEND:
case PM_EVENT_HIBERNATE:
return PCI_D3hot;
default:
dev_info(&dev->dev, "unrecognized suspend event %d\n",
state.event);
BUG();
}
return PCI_D0;
}
EXPORT_SYMBOL(pci_choose_state);
static int pci_save_pcie_state(struct pci_dev *dev)
{
int pos, i = 0;
struct pci_cap_saved_state *save_state;
u16 *cap;
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (pos <= 0)
return 0;
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
if (!save_state) {
dev_err(&dev->dev, "buffer not found in %s\n", __FUNCTION__);
return -ENOMEM;
}
cap = (u16 *)&save_state->data[0];
pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
return 0;
}
static void pci_restore_pcie_state(struct pci_dev *dev)
{
int i = 0, pos;
struct pci_cap_saved_state *save_state;
u16 *cap;
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (!save_state || pos <= 0)
return;
cap = (u16 *)&save_state->data[0];
pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
}
static int pci_save_pcix_state(struct pci_dev *dev)
{
int pos;
struct pci_cap_saved_state *save_state;
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (pos <= 0)
return 0;
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
if (!save_state) {
dev_err(&dev->dev, "buffer not found in %s\n", __FUNCTION__);
return -ENOMEM;
}
pci_read_config_word(dev, pos + PCI_X_CMD, (u16 *)save_state->data);
return 0;
}
static void pci_restore_pcix_state(struct pci_dev *dev)
{
int i = 0, pos;
struct pci_cap_saved_state *save_state;
u16 *cap;
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!save_state || pos <= 0)
return;
cap = (u16 *)&save_state->data[0];
pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
}
/**
* pci_save_state - save the PCI configuration space of a device before suspending
* @dev: - PCI device that we're dealing with
*/
int
pci_save_state(struct pci_dev *dev)
{
int i;
/* XXX: 100% dword access ok here? */
for (i = 0; i < 16; i++)
pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]);
if ((i = pci_save_pcie_state(dev)) != 0)
return i;
if ((i = pci_save_pcix_state(dev)) != 0)
return i;
return 0;
}
/**
* pci_restore_state - Restore the saved state of a PCI device
* @dev: - PCI device that we're dealing with
*/
int
pci_restore_state(struct pci_dev *dev)
{
int i;
u32 val;
/* PCI Express register must be restored first */
pci_restore_pcie_state(dev);
/*
* The Base Address register should be programmed before the command
* register(s)
*/
for (i = 15; i >= 0; i--) {
pci_read_config_dword(dev, i * 4, &val);
if (val != dev->saved_config_space[i]) {
dev_printk(KERN_DEBUG, &dev->dev, "restoring config "
"space at offset %#x (was %#x, writing %#x)\n",
i, val, (int)dev->saved_config_space[i]);
pci_write_config_dword(dev,i * 4,
dev->saved_config_space[i]);
}
}
pci_restore_pcix_state(dev);
pci_restore_msi_state(dev);
return 0;
}
static int do_pci_enable_device(struct pci_dev *dev, int bars)
{
int err;
err = pci_set_power_state(dev, PCI_D0);
if (err < 0 && err != -EIO)
return err;
err = pcibios_enable_device(dev, bars);
if (err < 0)
return err;
pci_fixup_device(pci_fixup_enable, dev);
return 0;
}
/**
* pci_reenable_device - Resume abandoned device
* @dev: PCI device to be resumed
*
* Note this function is a backend of pci_default_resume and is not supposed
* to be called by normal code, write proper resume handler and use it instead.
*/
int pci_reenable_device(struct pci_dev *dev)
{
if (atomic_read(&dev->enable_cnt))
return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
return 0;
}
static int __pci_enable_device_flags(struct pci_dev *dev,
resource_size_t flags)
{
int err;
int i, bars = 0;
if (atomic_add_return(1, &dev->enable_cnt) > 1)
return 0; /* already enabled */
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
if (dev->resource[i].flags & flags)
bars |= (1 << i);
err = do_pci_enable_device(dev, bars);
if (err < 0)
atomic_dec(&dev->enable_cnt);
return err;
}
/**
* pci_enable_device_io - Initialize a device for use with IO space
* @dev: PCI device to be initialized
*
* Initialize device before it's used by a driver. Ask low-level code
* to enable I/O resources. Wake up the device if it was suspended.
* Beware, this function can fail.
*/
int pci_enable_device_io(struct pci_dev *dev)
{
return __pci_enable_device_flags(dev, IORESOURCE_IO);
}
/**
* pci_enable_device_mem - Initialize a device for use with Memory space
* @dev: PCI device to be initialized
*
* Initialize device before it's used by a driver. Ask low-level code
* to enable Memory resources. Wake up the device if it was suspended.
* Beware, this function can fail.
*/
int pci_enable_device_mem(struct pci_dev *dev)
{
return __pci_enable_device_flags(dev, IORESOURCE_MEM);
}
PCI: switch pci_{enable,disable}_device() to be nestable Changes the pci_{enable,disable}_device() functions to work in a nested basis, so that eg, three calls to enable_device() require three calls to disable_device(). The reason for this is to simplify PCI drivers for multi-interface/capability devices. These are devices that cram more than one interface in a single function. A relevant example of that is the Wireless [USB] Host Controller Interface (similar to EHCI) [see http://www.intel.com/technology/comms/wusb/whci.htm]. In these kind of devices, multiple interfaces are accessed through a single bar and IRQ line. For that, the drivers map only the smallest area of the bar to access their register banks and use shared IRQ handlers. However, because the order at which those drivers load cannot be known ahead of time, the sequence in which the calls to pci_enable_device() and pci_disable_device() cannot be predicted. Thus: 1. driverA starts pci_enable_device() 2. driverB starts pci_enable_device() 3. driverA shutdown pci_disable_device() 4. driverB shutdown pci_disable_device() between steps 3 and 4, driver B would loose access to it's device, even if it didn't intend to. By using this modification, the device won't be disabled until all the callers to enable() have called disable(). This is implemented by replacing 'struct pci_dev->is_enabled' from a bitfield to an atomic use count. Each caller to enable increments it, each caller to disable decrements it. When the count increments from 0 to 1, __pci_enable_device() is called to actually enable the device. When it drops to zero, pci_disable_device() actually does the disabling. We keep the backend __pci_enable_device() for pci_default_resume() to use and also change the sysfs method implementation, so that userspace enabling/disabling the device doesn't disable it one time too much. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-11-22 21:40:31 +01:00
/**
* pci_enable_device - Initialize device before it's used by a driver.
* @dev: PCI device to be initialized
*
* Initialize device before it's used by a driver. Ask low-level code
* to enable I/O and memory. Wake up the device if it was suspended.
* Beware, this function can fail.
*
* Note we don't actually enable the device many times if we call
* this function repeatedly (we just increment the count).
*/
int pci_enable_device(struct pci_dev *dev)
{
return __pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO);
PCI: switch pci_{enable,disable}_device() to be nestable Changes the pci_{enable,disable}_device() functions to work in a nested basis, so that eg, three calls to enable_device() require three calls to disable_device(). The reason for this is to simplify PCI drivers for multi-interface/capability devices. These are devices that cram more than one interface in a single function. A relevant example of that is the Wireless [USB] Host Controller Interface (similar to EHCI) [see http://www.intel.com/technology/comms/wusb/whci.htm]. In these kind of devices, multiple interfaces are accessed through a single bar and IRQ line. For that, the drivers map only the smallest area of the bar to access their register banks and use shared IRQ handlers. However, because the order at which those drivers load cannot be known ahead of time, the sequence in which the calls to pci_enable_device() and pci_disable_device() cannot be predicted. Thus: 1. driverA starts pci_enable_device() 2. driverB starts pci_enable_device() 3. driverA shutdown pci_disable_device() 4. driverB shutdown pci_disable_device() between steps 3 and 4, driver B would loose access to it's device, even if it didn't intend to. By using this modification, the device won't be disabled until all the callers to enable() have called disable(). This is implemented by replacing 'struct pci_dev->is_enabled' from a bitfield to an atomic use count. Each caller to enable increments it, each caller to disable decrements it. When the count increments from 0 to 1, __pci_enable_device() is called to actually enable the device. When it drops to zero, pci_disable_device() actually does the disabling. We keep the backend __pci_enable_device() for pci_default_resume() to use and also change the sysfs method implementation, so that userspace enabling/disabling the device doesn't disable it one time too much. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-11-22 21:40:31 +01:00
}
/*
* Managed PCI resources. This manages device on/off, intx/msi/msix
* on/off and BAR regions. pci_dev itself records msi/msix status, so
* there's no need to track it separately. pci_devres is initialized
* when a device is enabled using managed PCI device enable interface.
*/
struct pci_devres {
unsigned int enabled:1;
unsigned int pinned:1;
unsigned int orig_intx:1;
unsigned int restore_intx:1;
u32 region_mask;
};
static void pcim_release(struct device *gendev, void *res)
{
struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
struct pci_devres *this = res;
int i;
if (dev->msi_enabled)
pci_disable_msi(dev);
if (dev->msix_enabled)
pci_disable_msix(dev);
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
if (this->region_mask & (1 << i))
pci_release_region(dev, i);
if (this->restore_intx)
pci_intx(dev, this->orig_intx);
if (this->enabled && !this->pinned)
pci_disable_device(dev);
}
static struct pci_devres * get_pci_dr(struct pci_dev *pdev)
{
struct pci_devres *dr, *new_dr;
dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
if (dr)
return dr;
new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
if (!new_dr)
return NULL;
return devres_get(&pdev->dev, new_dr, NULL, NULL);
}
static struct pci_devres * find_pci_dr(struct pci_dev *pdev)
{
if (pci_is_managed(pdev))
return devres_find(&pdev->dev, pcim_release, NULL, NULL);
return NULL;
}
/**
* pcim_enable_device - Managed pci_enable_device()
* @pdev: PCI device to be initialized
*
* Managed pci_enable_device().
*/
int pcim_enable_device(struct pci_dev *pdev)
{
struct pci_devres *dr;
int rc;
dr = get_pci_dr(pdev);
if (unlikely(!dr))
return -ENOMEM;
if (dr->enabled)
return 0;
rc = pci_enable_device(pdev);
if (!rc) {
pdev->is_managed = 1;
dr->enabled = 1;
}
return rc;
}
/**
* pcim_pin_device - Pin managed PCI device
* @pdev: PCI device to pin
*
* Pin managed PCI device @pdev. Pinned device won't be disabled on
* driver detach. @pdev must have been enabled with
* pcim_enable_device().
*/
void pcim_pin_device(struct pci_dev *pdev)
{
struct pci_devres *dr;
dr = find_pci_dr(pdev);
WARN_ON(!dr || !dr->enabled);
if (dr)
dr->pinned = 1;
}
/**
* pcibios_disable_device - disable arch specific PCI resources for device dev
* @dev: the PCI device to disable
*
* Disables architecture specific PCI resources for the device. This
* is the default implementation. Architecture implementations can
* override this.
*/
void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {}
/**
* pci_disable_device - Disable PCI device after use
* @dev: PCI device to be disabled
*
* Signal to the system that the PCI device is not in use by the system
* anymore. This only involves disabling PCI bus-mastering, if active.
PCI: switch pci_{enable,disable}_device() to be nestable Changes the pci_{enable,disable}_device() functions to work in a nested basis, so that eg, three calls to enable_device() require three calls to disable_device(). The reason for this is to simplify PCI drivers for multi-interface/capability devices. These are devices that cram more than one interface in a single function. A relevant example of that is the Wireless [USB] Host Controller Interface (similar to EHCI) [see http://www.intel.com/technology/comms/wusb/whci.htm]. In these kind of devices, multiple interfaces are accessed through a single bar and IRQ line. For that, the drivers map only the smallest area of the bar to access their register banks and use shared IRQ handlers. However, because the order at which those drivers load cannot be known ahead of time, the sequence in which the calls to pci_enable_device() and pci_disable_device() cannot be predicted. Thus: 1. driverA starts pci_enable_device() 2. driverB starts pci_enable_device() 3. driverA shutdown pci_disable_device() 4. driverB shutdown pci_disable_device() between steps 3 and 4, driver B would loose access to it's device, even if it didn't intend to. By using this modification, the device won't be disabled until all the callers to enable() have called disable(). This is implemented by replacing 'struct pci_dev->is_enabled' from a bitfield to an atomic use count. Each caller to enable increments it, each caller to disable decrements it. When the count increments from 0 to 1, __pci_enable_device() is called to actually enable the device. When it drops to zero, pci_disable_device() actually does the disabling. We keep the backend __pci_enable_device() for pci_default_resume() to use and also change the sysfs method implementation, so that userspace enabling/disabling the device doesn't disable it one time too much. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-11-22 21:40:31 +01:00
*
* Note we don't actually disable the device until all callers of
* pci_device_enable() have called pci_device_disable().
*/
void
pci_disable_device(struct pci_dev *dev)
{
struct pci_devres *dr;
u16 pci_command;
dr = find_pci_dr(dev);
if (dr)
dr->enabled = 0;
PCI: switch pci_{enable,disable}_device() to be nestable Changes the pci_{enable,disable}_device() functions to work in a nested basis, so that eg, three calls to enable_device() require three calls to disable_device(). The reason for this is to simplify PCI drivers for multi-interface/capability devices. These are devices that cram more than one interface in a single function. A relevant example of that is the Wireless [USB] Host Controller Interface (similar to EHCI) [see http://www.intel.com/technology/comms/wusb/whci.htm]. In these kind of devices, multiple interfaces are accessed through a single bar and IRQ line. For that, the drivers map only the smallest area of the bar to access their register banks and use shared IRQ handlers. However, because the order at which those drivers load cannot be known ahead of time, the sequence in which the calls to pci_enable_device() and pci_disable_device() cannot be predicted. Thus: 1. driverA starts pci_enable_device() 2. driverB starts pci_enable_device() 3. driverA shutdown pci_disable_device() 4. driverB shutdown pci_disable_device() between steps 3 and 4, driver B would loose access to it's device, even if it didn't intend to. By using this modification, the device won't be disabled until all the callers to enable() have called disable(). This is implemented by replacing 'struct pci_dev->is_enabled' from a bitfield to an atomic use count. Each caller to enable increments it, each caller to disable decrements it. When the count increments from 0 to 1, __pci_enable_device() is called to actually enable the device. When it drops to zero, pci_disable_device() actually does the disabling. We keep the backend __pci_enable_device() for pci_default_resume() to use and also change the sysfs method implementation, so that userspace enabling/disabling the device doesn't disable it one time too much. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-11-22 21:40:31 +01:00
if (atomic_sub_return(1, &dev->enable_cnt) != 0)
return;
pci_read_config_word(dev, PCI_COMMAND, &pci_command);
if (pci_command & PCI_COMMAND_MASTER) {
pci_command &= ~PCI_COMMAND_MASTER;
pci_write_config_word(dev, PCI_COMMAND, pci_command);
}
dev->is_busmaster = 0;
pcibios_disable_device(dev);
}
/**
* pcibios_set_pcie_reset_state - set reset state for device dev
* @dev: the PCI-E device reset
* @state: Reset state to enter into
*
*
* Sets the PCI-E reset state for the device. This is the default
* implementation. Architecture implementations can override this.
*/
int __attribute__ ((weak)) pcibios_set_pcie_reset_state(struct pci_dev *dev,
enum pcie_reset_state state)
{
return -EINVAL;
}
/**
* pci_set_pcie_reset_state - set reset state for device dev
* @dev: the PCI-E device reset
* @state: Reset state to enter into
*
*
* Sets the PCI reset state for the device.
*/
int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
{
return pcibios_set_pcie_reset_state(dev, state);
}
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
/**
* pci_pme_capable - check the capability of PCI device to generate PME#
* @dev: PCI device to handle.
* @state: PCI state from which device will issue PME#.
*/
bool pci_pme_capable(struct pci_dev *dev, pci_power_t state)
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
{
if (!dev->pm_cap)
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
return false;
return !!(dev->pme_support & (1 << state));
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
}
/**
* pci_pme_active - enable or disable PCI device's PME# function
* @dev: PCI device to handle.
* @enable: 'true' to enable PME# generation; 'false' to disable it.
*
* The caller must verify that the device is capable of generating PME# before
* calling this function with @enable equal to 'true'.
*/
void pci_pme_active(struct pci_dev *dev, bool enable)
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
{
u16 pmcsr;
if (!dev->pm_cap)
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
return;
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
/* Clear PME_Status by writing 1 to it and enable PME# */
pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE;
if (!enable)
pmcsr &= ~PCI_PM_CTRL_PME_ENABLE;
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
dev_printk(KERN_INFO, &dev->dev, "PME# %s\n",
enable ? "enabled" : "disabled");
}
/**
* pci_enable_wake - enable PCI device as wakeup event source
* @dev: PCI device affected
* @state: PCI state from which device will issue wakeup events
* @enable: True to enable event generation; false to disable
*
* This enables the device as a wakeup event source, or disables it.
* When such events involves platform-specific hooks, those hooks are
* called automatically by this routine.
*
* Devices with legacy power management (no standard PCI PM capabilities)
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
* always require such platform hooks.
*
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
* RETURN VALUE:
* 0 is returned on success
* -EINVAL is returned if device is not supposed to wake up the system
* Error code depending on the platform is returned if both the platform and
* the native mechanism fail to enable the generation of wake-up events
*/
int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
{
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
int error = 0;
bool pme_done = false;
if (enable && !device_may_wakeup(&dev->dev))
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
return -EINVAL;
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
/*
* According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
* Anderson we should be doing PME# wake enable followed by ACPI wake
* enable. To disable wake-up we call the platform first, for symmetry.
*/
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
if (!enable && platform_pci_can_wakeup(dev))
error = platform_pci_sleep_wake(dev, false);
if (!enable || pci_pme_capable(dev, state)) {
pci_pme_active(dev, enable);
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
pme_done = true;
}
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
if (enable && platform_pci_can_wakeup(dev))
error = platform_pci_sleep_wake(dev, true);
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
return pme_done ? 0 : error;
}
/**
* pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
* @dev: PCI device to prepare
* @enable: True to enable wake-up event generation; false to disable
*
* Many drivers want the device to wake up the system from D3_hot or D3_cold
* and this function allows them to set that up cleanly - pci_enable_wake()
* should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
* ordering constraints.
*
* This function only returns error code if the device is not capable of
* generating PME# from both D3_hot and D3_cold, and the platform is unable to
* enable wake-up power for it.
*/
int pci_wake_from_d3(struct pci_dev *dev, bool enable)
{
return pci_pme_capable(dev, PCI_D3cold) ?
pci_enable_wake(dev, PCI_D3cold, enable) :
pci_enable_wake(dev, PCI_D3hot, enable);
}
/**
* pci_target_state - find an appropriate low power state for a given PCI dev
* @dev: PCI device
*
* Use underlying platform code to find a supported low power state for @dev.
* If the platform can't manage @dev, return the deepest state from which it
* can generate wake events, based on any available PME info.
*/
pci_power_t pci_target_state(struct pci_dev *dev)
{
pci_power_t target_state = PCI_D3hot;
if (platform_pci_power_manageable(dev)) {
/*
* Call the platform to choose the target state of the device
* and enable wake-up from this state if supported.
*/
pci_power_t state = platform_pci_choose_state(dev);
switch (state) {
case PCI_POWER_ERROR:
case PCI_UNKNOWN:
break;
case PCI_D1:
case PCI_D2:
if (pci_no_d1d2(dev))
break;
default:
target_state = state;
}
} else if (device_may_wakeup(&dev->dev)) {
/*
* Find the deepest state from which the device can generate
* wake-up events, make it the target state and enable device
* to generate PME#.
*/
if (!dev->pm_cap)
return PCI_POWER_ERROR;
if (dev->pme_support) {
while (target_state
&& !(dev->pme_support & (1 << target_state)))
target_state--;
}
}
return target_state;
}
/**
* pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
* @dev: Device to handle.
*
* Choose the power state appropriate for the device depending on whether
* it can wake up the system and/or is power manageable by the platform
* (PCI_D3hot is the default) and put the device into that state.
*/
int pci_prepare_to_sleep(struct pci_dev *dev)
{
pci_power_t target_state = pci_target_state(dev);
int error;
if (target_state == PCI_POWER_ERROR)
return -EIO;
pci_enable_wake(dev, target_state, true);
error = pci_set_power_state(dev, target_state);
if (error)
pci_enable_wake(dev, target_state, false);
return error;
}
/**
* pci_back_from_sleep - turn PCI device on during system-wide transition into working state
* @dev: Device to handle.
*
* Disable device's sytem wake-up capability and put it into D0.
*/
int pci_back_from_sleep(struct pci_dev *dev)
{
pci_enable_wake(dev, PCI_D0, false);
return pci_set_power_state(dev, PCI_D0);
}
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
/**
* pci_pm_init - Initialize PM functions of given PCI device
* @dev: PCI device to handle.
*/
void pci_pm_init(struct pci_dev *dev)
{
int pm;
u16 pmc;
dev->pm_cap = 0;
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
/* find PCI PM capability in list */
pm = pci_find_capability(dev, PCI_CAP_ID_PM);
if (!pm)
return;
/* Check device's ability to generate PME# */
pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc);
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
if ((pmc & PCI_PM_CAP_VER_MASK) > 3) {
dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n",
pmc & PCI_PM_CAP_VER_MASK);
return;
}
dev->pm_cap = pm;
dev->d1_support = false;
dev->d2_support = false;
if (!pci_no_d1d2(dev)) {
if (pmc & PCI_PM_CAP_D1)
dev->d1_support = true;
if (pmc & PCI_PM_CAP_D2)
dev->d2_support = true;
if (dev->d1_support || dev->d2_support)
dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n",
dev->d1_support ? " D1" : "",
dev->d2_support ? " D2" : "");
}
pmc &= PCI_PM_CAP_PME_MASK;
if (pmc) {
dev_info(&dev->dev, "PME# supported from%s%s%s%s%s\n",
(pmc & PCI_PM_CAP_PME_D0) ? " D0" : "",
(pmc & PCI_PM_CAP_PME_D1) ? " D1" : "",
(pmc & PCI_PM_CAP_PME_D2) ? " D2" : "",
(pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "",
(pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : "");
dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT;
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
/*
* Make device's PM flags reflect the wake-up capability, but
* let the user space enable it to wake up the system as needed.
*/
device_set_wakeup_capable(&dev->dev, true);
device_set_wakeup_enable(&dev->dev, false);
/* Disable the PME# generation functionality */
pci_pme_active(dev, false);
} else {
dev->pme_support = 0;
PCI ACPI: Rework PCI handling of wake-up * Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-07-07 03:34:48 +02:00
}
}
/**
* pci_add_save_buffer - allocate buffer for saving given capability registers
* @dev: the PCI device
* @cap: the capability to allocate the buffer for
* @size: requested size of the buffer
*/
static int pci_add_cap_save_buffer(
struct pci_dev *dev, char cap, unsigned int size)
{
int pos;
struct pci_cap_saved_state *save_state;
pos = pci_find_capability(dev, cap);
if (pos <= 0)
return 0;
save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL);
if (!save_state)
return -ENOMEM;
save_state->cap_nr = cap;
pci_add_saved_cap(dev, save_state);
return 0;
}
/**
* pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
* @dev: the PCI device
*/
void pci_allocate_cap_save_buffers(struct pci_dev *dev)
{
int error;
error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, 4 * sizeof(u16));
if (error)
dev_err(&dev->dev,
"unable to preallocate PCI Express save buffer\n");
error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16));
if (error)
dev_err(&dev->dev,
"unable to preallocate PCI-X save buffer\n");
}
/**
* pci_enable_ari - enable ARI forwarding if hardware support it
* @dev: the PCI device
*/
void pci_enable_ari(struct pci_dev *dev)
{
int pos;
u32 cap;
u16 ctrl;
struct pci_dev *bridge;
if (!dev->is_pcie || dev->devfn)
return;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
if (!pos)
return;
bridge = dev->bus->self;
if (!bridge || !bridge->is_pcie)
return;
pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
if (!pos)
return;
pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2, &cap);
if (!(cap & PCI_EXP_DEVCAP2_ARI))
return;
pci_read_config_word(bridge, pos + PCI_EXP_DEVCTL2, &ctrl);
ctrl |= PCI_EXP_DEVCTL2_ARI;
pci_write_config_word(bridge, pos + PCI_EXP_DEVCTL2, ctrl);
bridge->ari_enabled = 1;
}
/**
* pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
* @dev: the PCI device
* @pin: the INTx pin (1=INTA, 2=INTB, 3=INTD, 4=INTD)
*
* Perform INTx swizzling for a device behind one level of bridge. This is
* required by section 9.1 of the PCI-to-PCI bridge specification for devices
* behind bridges on add-in cards.
*/
u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin)
{
return (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1;
}
int
pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
{
u8 pin;
pin = dev->pin;
if (!pin)
return -1;
while (dev->bus->self) {
pin = pci_swizzle_interrupt_pin(dev, pin);
dev = dev->bus->self;
}
*bridge = dev;
return pin;
}
/**
* pci_release_region - Release a PCI bar
* @pdev: PCI device whose resources were previously reserved by pci_request_region
* @bar: BAR to release
*
* Releases the PCI I/O and memory resources previously reserved by a
* successful call to pci_request_region. Call this function only
* after all use of the PCI regions has ceased.
*/
void pci_release_region(struct pci_dev *pdev, int bar)
{
struct pci_devres *dr;
if (pci_resource_len(pdev, bar) == 0)
return;
if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
release_region(pci_resource_start(pdev, bar),
pci_resource_len(pdev, bar));
else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
release_mem_region(pci_resource_start(pdev, bar),
pci_resource_len(pdev, bar));
dr = find_pci_dr(pdev);
if (dr)
dr->region_mask &= ~(1 << bar);
}
/**
* pci_request_region - Reserved PCI I/O and memory resource
* @pdev: PCI device whose resources are to be reserved
* @bar: BAR to be reserved
* @res_name: Name to be associated with resource.
*
* Mark the PCI region associated with PCI device @pdev BR @bar as
* being reserved by owner @res_name. Do not access any
* address inside the PCI regions unless this call returns
* successfully.
*
* Returns 0 on success, or %EBUSY on error. A warning
* message is also printed on failure.
*/
static int __pci_request_region(struct pci_dev *pdev, int bar, const char *res_name,
int exclusive)
{
struct pci_devres *dr;
if (pci_resource_len(pdev, bar) == 0)
return 0;
if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
if (!request_region(pci_resource_start(pdev, bar),
pci_resource_len(pdev, bar), res_name))
goto err_out;
}
else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
if (!__request_mem_region(pci_resource_start(pdev, bar),
pci_resource_len(pdev, bar), res_name,
exclusive))
goto err_out;
}
dr = find_pci_dr(pdev);
if (dr)
dr->region_mask |= 1 << bar;
return 0;
err_out:
dev_warn(&pdev->dev, "BAR %d: can't reserve %s region %pR\n",
bar,
pci_resource_flags(pdev, bar) & IORESOURCE_IO ? "I/O" : "mem",
&pdev->resource[bar]);
return -EBUSY;
}
/**
* pci_request_region - Reserved PCI I/O and memory resource
* @pdev: PCI device whose resources are to be reserved
* @bar: BAR to be reserved
* @res_name: Name to be associated with resource.
*
* Mark the PCI region associated with PCI device @pdev BR @bar as
* being reserved by owner @res_name. Do not access any
* address inside the PCI regions unless this call returns
* successfully.
*
* Returns 0 on success, or %EBUSY on error. A warning
* message is also printed on failure.
*/
int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
{
return __pci_request_region(pdev, bar, res_name, 0);
}
/**
* pci_request_region_exclusive - Reserved PCI I/O and memory resource
* @pdev: PCI device whose resources are to be reserved
* @bar: BAR to be reserved
* @res_name: Name to be associated with resource.
*
* Mark the PCI region associated with PCI device @pdev BR @bar as
* being reserved by owner @res_name. Do not access any
* address inside the PCI regions unless this call returns
* successfully.
*
* Returns 0 on success, or %EBUSY on error. A warning
* message is also printed on failure.
*
* The key difference that _exclusive makes it that userspace is
* explicitly not allowed to map the resource via /dev/mem or
* sysfs.
*/
int pci_request_region_exclusive(struct pci_dev *pdev, int bar, const char *res_name)
{
return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE);
}
/**
* pci_release_selected_regions - Release selected PCI I/O and memory resources
* @pdev: PCI device whose resources were previously reserved
* @bars: Bitmask of BARs to be released
*
* Release selected PCI I/O and memory resources previously reserved.
* Call this function only after all use of the PCI regions has ceased.
*/
void pci_release_selected_regions(struct pci_dev *pdev, int bars)
{
int i;
for (i = 0; i < 6; i++)
if (bars & (1 << i))
pci_release_region(pdev, i);
}
int __pci_request_selected_regions(struct pci_dev *pdev, int bars,
const char *res_name, int excl)
{
int i;
for (i = 0; i < 6; i++)
if (bars & (1 << i))
if (__pci_request_region(pdev, i, res_name, excl))
goto err_out;
return 0;
err_out:
while(--i >= 0)
if (bars & (1 << i))
pci_release_region(pdev, i);
return -EBUSY;
}
/**
* pci_request_selected_regions - Reserve selected PCI I/O and memory resources
* @pdev: PCI device whose resources are to be reserved
* @bars: Bitmask of BARs to be requested
* @res_name: Name to be associated with resource
*/
int pci_request_selected_regions(struct pci_dev *pdev, int bars,
const char *res_name)
{
return __pci_request_selected_regions(pdev, bars, res_name, 0);
}
int pci_request_selected_regions_exclusive(struct pci_dev *pdev,
int bars, const char *res_name)
{
return __pci_request_selected_regions(pdev, bars, res_name,
IORESOURCE_EXCLUSIVE);
}
/**
* pci_release_regions - Release reserved PCI I/O and memory resources
* @pdev: PCI device whose resources were previously reserved by pci_request_regions
*
* Releases all PCI I/O and memory resources previously reserved by a
* successful call to pci_request_regions. Call this function only
* after all use of the PCI regions has ceased.
*/
void pci_release_regions(struct pci_dev *pdev)
{
pci_release_selected_regions(pdev, (1 << 6) - 1);
}
/**
* pci_request_regions - Reserved PCI I/O and memory resources
* @pdev: PCI device whose resources are to be reserved
* @res_name: Name to be associated with resource.
*
* Mark all PCI regions associated with PCI device @pdev as
* being reserved by owner @res_name. Do not access any
* address inside the PCI regions unless this call returns
* successfully.
*
* Returns 0 on success, or %EBUSY on error. A warning
* message is also printed on failure.
*/
int pci_request_regions(struct pci_dev *pdev, const char *res_name)
{
return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name);
}
/**
* pci_request_regions_exclusive - Reserved PCI I/O and memory resources
* @pdev: PCI device whose resources are to be reserved
* @res_name: Name to be associated with resource.
*
* Mark all PCI regions associated with PCI device @pdev as
* being reserved by owner @res_name. Do not access any
* address inside the PCI regions unless this call returns
* successfully.
*
* pci_request_regions_exclusive() will mark the region so that
* /dev/mem and the sysfs MMIO access will not be allowed.
*
* Returns 0 on success, or %EBUSY on error. A warning
* message is also printed on failure.
*/
int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name)
{
return pci_request_selected_regions_exclusive(pdev,
((1 << 6) - 1), res_name);
}
/**
* pci_set_master - enables bus-mastering for device dev
* @dev: the PCI device to enable
*
* Enables bus-mastering on the device and calls pcibios_set_master()
* to do the needed arch specific settings.
*/
void
pci_set_master(struct pci_dev *dev)
{
u16 cmd;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (! (cmd & PCI_COMMAND_MASTER)) {
dev_dbg(&dev->dev, "enabling bus mastering\n");
cmd |= PCI_COMMAND_MASTER;
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
dev->is_busmaster = 1;
pcibios_set_master(dev);
}
#ifdef PCI_DISABLE_MWI
int pci_set_mwi(struct pci_dev *dev)
{
return 0;
}
int pci_try_set_mwi(struct pci_dev *dev)
{
return 0;
}
void pci_clear_mwi(struct pci_dev *dev)
{
}
#else
#ifndef PCI_CACHE_LINE_BYTES
#define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES
#endif
/* This can be overridden by arch code. */
/* Don't forget this is measured in 32-bit words, not bytes */
u8 pci_cache_line_size = PCI_CACHE_LINE_BYTES / 4;
/**
* pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
* @dev: the PCI device for which MWI is to be enabled
*
* Helper function for pci_set_mwi.
* Originally copied from drivers/net/acenic.c.
* Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
static int
pci_set_cacheline_size(struct pci_dev *dev)
{
u8 cacheline_size;
if (!pci_cache_line_size)
return -EINVAL; /* The system doesn't support MWI. */
/* Validate current setting: the PCI_CACHE_LINE_SIZE must be
equal to or multiple of the right value. */
pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
if (cacheline_size >= pci_cache_line_size &&
(cacheline_size % pci_cache_line_size) == 0)
return 0;
/* Write the correct value. */
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size);
/* Read it back. */
pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
if (cacheline_size == pci_cache_line_size)
return 0;
dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not "
"supported\n", pci_cache_line_size << 2);
return -EINVAL;
}
/**
* pci_set_mwi - enables memory-write-invalidate PCI transaction
* @dev: the PCI device for which MWI is enabled
*
* Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
int
pci_set_mwi(struct pci_dev *dev)
{
int rc;
u16 cmd;
rc = pci_set_cacheline_size(dev);
if (rc)
return rc;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (! (cmd & PCI_COMMAND_INVALIDATE)) {
dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n");
cmd |= PCI_COMMAND_INVALIDATE;
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
return 0;
}
/**
* pci_try_set_mwi - enables memory-write-invalidate PCI transaction
* @dev: the PCI device for which MWI is enabled
*
* Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
* Callers are not required to check the return value.
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
int pci_try_set_mwi(struct pci_dev *dev)
{
int rc = pci_set_mwi(dev);
return rc;
}
/**
* pci_clear_mwi - disables Memory-Write-Invalidate for device dev
* @dev: the PCI device to disable
*
* Disables PCI Memory-Write-Invalidate transaction on the device
*/
void
pci_clear_mwi(struct pci_dev *dev)
{
u16 cmd;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (cmd & PCI_COMMAND_INVALIDATE) {
cmd &= ~PCI_COMMAND_INVALIDATE;
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
}
#endif /* ! PCI_DISABLE_MWI */
/**
* pci_intx - enables/disables PCI INTx for device dev
* @pdev: the PCI device to operate on
* @enable: boolean: whether to enable or disable PCI INTx
*
* Enables/disables PCI INTx for device dev
*/
void
pci_intx(struct pci_dev *pdev, int enable)
{
u16 pci_command, new;
pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
if (enable) {
new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
} else {
new = pci_command | PCI_COMMAND_INTX_DISABLE;
}
if (new != pci_command) {
struct pci_devres *dr;
pci_write_config_word(pdev, PCI_COMMAND, new);
dr = find_pci_dr(pdev);
if (dr && !dr->restore_intx) {
dr->restore_intx = 1;
dr->orig_intx = !enable;
}
}
}
/**
* pci_msi_off - disables any msi or msix capabilities
* @dev: the PCI device to operate on
*
* If you want to use msi see pci_enable_msi and friends.
* This is a lower level primitive that allows us to disable
* msi operation at the device level.
*/
void pci_msi_off(struct pci_dev *dev)
{
int pos;
u16 control;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (pos) {
pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
control &= ~PCI_MSI_FLAGS_ENABLE;
pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
}
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (pos) {
pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
control &= ~PCI_MSIX_FLAGS_ENABLE;
pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
}
}
#ifndef HAVE_ARCH_PCI_SET_DMA_MASK
/*
* These can be overridden by arch-specific implementations
*/
int
pci_set_dma_mask(struct pci_dev *dev, u64 mask)
{
if (!pci_dma_supported(dev, mask))
return -EIO;
dev->dma_mask = mask;
return 0;
}
int
pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
{
if (!pci_dma_supported(dev, mask))
return -EIO;
dev->dev.coherent_dma_mask = mask;
return 0;
}
#endif
#ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE
int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size)
{
return dma_set_max_seg_size(&dev->dev, size);
}
EXPORT_SYMBOL(pci_set_dma_max_seg_size);
#endif
#ifndef HAVE_ARCH_PCI_SET_DMA_SEGMENT_BOUNDARY
int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask)
{
return dma_set_seg_boundary(&dev->dev, mask);
}
EXPORT_SYMBOL(pci_set_dma_seg_boundary);
#endif
static int __pcie_flr(struct pci_dev *dev, int probe)
{
u16 status;
u32 cap;
int exppos = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (!exppos)
return -ENOTTY;
pci_read_config_dword(dev, exppos + PCI_EXP_DEVCAP, &cap);
if (!(cap & PCI_EXP_DEVCAP_FLR))
return -ENOTTY;
if (probe)
return 0;
pci_block_user_cfg_access(dev);
/* Wait for Transaction Pending bit clean */
msleep(100);
pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status);
if (status & PCI_EXP_DEVSTA_TRPND) {
dev_info(&dev->dev, "Busy after 100ms while trying to reset; "
"sleeping for 1 second\n");
ssleep(1);
pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status);
if (status & PCI_EXP_DEVSTA_TRPND)
dev_info(&dev->dev, "Still busy after 1s; "
"proceeding with reset anyway\n");
}
pci_write_config_word(dev, exppos + PCI_EXP_DEVCTL,
PCI_EXP_DEVCTL_BCR_FLR);
mdelay(100);
pci_unblock_user_cfg_access(dev);
return 0;
}
static int __pci_af_flr(struct pci_dev *dev, int probe)
{
int cappos = pci_find_capability(dev, PCI_CAP_ID_AF);
u8 status;
u8 cap;
if (!cappos)
return -ENOTTY;
pci_read_config_byte(dev, cappos + PCI_AF_CAP, &cap);
if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR))
return -ENOTTY;
if (probe)
return 0;
pci_block_user_cfg_access(dev);
/* Wait for Transaction Pending bit clean */
msleep(100);
pci_read_config_byte(dev, cappos + PCI_AF_STATUS, &status);
if (status & PCI_AF_STATUS_TP) {
dev_info(&dev->dev, "Busy after 100ms while trying to"
" reset; sleeping for 1 second\n");
ssleep(1);
pci_read_config_byte(dev,
cappos + PCI_AF_STATUS, &status);
if (status & PCI_AF_STATUS_TP)
dev_info(&dev->dev, "Still busy after 1s; "
"proceeding with reset anyway\n");
}
pci_write_config_byte(dev, cappos + PCI_AF_CTRL, PCI_AF_CTRL_FLR);
mdelay(100);
pci_unblock_user_cfg_access(dev);
return 0;
}
static int __pci_reset_function(struct pci_dev *pdev, int probe)
{
int res;
res = __pcie_flr(pdev, probe);
if (res != -ENOTTY)
return res;
res = __pci_af_flr(pdev, probe);
if (res != -ENOTTY)
return res;
return res;
}
/**
* pci_execute_reset_function() - Reset a PCI device function
* @dev: Device function to reset
*
* Some devices allow an individual function to be reset without affecting
* other functions in the same device. The PCI device must be responsive
* to PCI config space in order to use this function.
*
* The device function is presumed to be unused when this function is called.
* Resetting the device will make the contents of PCI configuration space
* random, so any caller of this must be prepared to reinitialise the
* device including MSI, bus mastering, BARs, decoding IO and memory spaces,
* etc.
*
* Returns 0 if the device function was successfully reset or -ENOTTY if the
* device doesn't support resetting a single function.
*/
int pci_execute_reset_function(struct pci_dev *dev)
{
return __pci_reset_function(dev, 0);
}
EXPORT_SYMBOL_GPL(pci_execute_reset_function);
/**
* pci_reset_function() - quiesce and reset a PCI device function
* @dev: Device function to reset
*
* Some devices allow an individual function to be reset without affecting
* other functions in the same device. The PCI device must be responsive
* to PCI config space in order to use this function.
*
* This function does not just reset the PCI portion of a device, but
* clears all the state associated with the device. This function differs
* from pci_execute_reset_function in that it saves and restores device state
* over the reset.
*
* Returns 0 if the device function was successfully reset or -ENOTTY if the
* device doesn't support resetting a single function.
*/
int pci_reset_function(struct pci_dev *dev)
{
int r = __pci_reset_function(dev, 1);
if (r < 0)
return r;
if (!dev->msi_enabled && !dev->msix_enabled && dev->irq != 0)
disable_irq(dev->irq);
pci_save_state(dev);
pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
r = pci_execute_reset_function(dev);
pci_restore_state(dev);
if (!dev->msi_enabled && !dev->msix_enabled && dev->irq != 0)
enable_irq(dev->irq);
return r;
}
EXPORT_SYMBOL_GPL(pci_reset_function);
/**
* pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
* @dev: PCI device to query
*
* Returns mmrbc: maximum designed memory read count in bytes
* or appropriate error value.
*/
int pcix_get_max_mmrbc(struct pci_dev *dev)
{
int err, cap;
u32 stat;
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!cap)
return -EINVAL;
err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat);
if (err)
return -EINVAL;
return (stat & PCI_X_STATUS_MAX_READ) >> 12;
}
EXPORT_SYMBOL(pcix_get_max_mmrbc);
/**
* pcix_get_mmrbc - get PCI-X maximum memory read byte count
* @dev: PCI device to query
*
* Returns mmrbc: maximum memory read count in bytes
* or appropriate error value.
*/
int pcix_get_mmrbc(struct pci_dev *dev)
{
int ret, cap;
u32 cmd;
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!cap)
return -EINVAL;
ret = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd);
if (!ret)
ret = 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2);
return ret;
}
EXPORT_SYMBOL(pcix_get_mmrbc);
/**
* pcix_set_mmrbc - set PCI-X maximum memory read byte count
* @dev: PCI device to query
* @mmrbc: maximum memory read count in bytes
* valid values are 512, 1024, 2048, 4096
*
* If possible sets maximum memory read byte count, some bridges have erratas
* that prevent this.
*/
int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc)
{
int cap, err = -EINVAL;
u32 stat, cmd, v, o;
if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc))
goto out;
v = ffs(mmrbc) - 10;
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!cap)
goto out;
err = pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat);
if (err)
goto out;
if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21)
return -E2BIG;
err = pci_read_config_dword(dev, cap + PCI_X_CMD, &cmd);
if (err)
goto out;
o = (cmd & PCI_X_CMD_MAX_READ) >> 2;
if (o != v) {
if (v > o && dev->bus &&
(dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC))
return -EIO;
cmd &= ~PCI_X_CMD_MAX_READ;
cmd |= v << 2;
err = pci_write_config_dword(dev, cap + PCI_X_CMD, cmd);
}
out:
return err;
}
EXPORT_SYMBOL(pcix_set_mmrbc);
/**
* pcie_get_readrq - get PCI Express read request size
* @dev: PCI device to query
*
* Returns maximum memory read request in bytes
* or appropriate error value.
*/
int pcie_get_readrq(struct pci_dev *dev)
{
int ret, cap;
u16 ctl;
cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (!cap)
return -EINVAL;
ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
if (!ret)
ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12);
return ret;
}
EXPORT_SYMBOL(pcie_get_readrq);
/**
* pcie_set_readrq - set PCI Express maximum memory read request
* @dev: PCI device to query
* @rq: maximum memory read count in bytes
* valid values are 128, 256, 512, 1024, 2048, 4096
*
* If possible sets maximum read byte count
*/
int pcie_set_readrq(struct pci_dev *dev, int rq)
{
int cap, err = -EINVAL;
u16 ctl, v;
if (rq < 128 || rq > 4096 || !is_power_of_2(rq))
goto out;
v = (ffs(rq) - 8) << 12;
cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (!cap)
goto out;
err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
if (err)
goto out;
if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) {
ctl &= ~PCI_EXP_DEVCTL_READRQ;
ctl |= v;
err = pci_write_config_dword(dev, cap + PCI_EXP_DEVCTL, ctl);
}
out:
return err;
}
EXPORT_SYMBOL(pcie_set_readrq);
/**
* pci_select_bars - Make BAR mask from the type of resource
* @dev: the PCI device for which BAR mask is made
* @flags: resource type mask to be selected
*
* This helper routine makes bar mask from the type of resource.
*/
int pci_select_bars(struct pci_dev *dev, unsigned long flags)
{
int i, bars = 0;
for (i = 0; i < PCI_NUM_RESOURCES; i++)
if (pci_resource_flags(dev, i) & flags)
bars |= (1 << i);
return bars;
}
/**
* pci_resource_bar - get position of the BAR associated with a resource
* @dev: the PCI device
* @resno: the resource number
* @type: the BAR type to be filled in
*
* Returns BAR position in config space, or 0 if the BAR is invalid.
*/
int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
{
if (resno < PCI_ROM_RESOURCE) {
*type = pci_bar_unknown;
return PCI_BASE_ADDRESS_0 + 4 * resno;
} else if (resno == PCI_ROM_RESOURCE) {
*type = pci_bar_mem32;
return dev->rom_base_reg;
}
dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno);
return 0;
}
static void __devinit pci_no_domains(void)
{
#ifdef CONFIG_PCI_DOMAINS
pci_domains_supported = 0;
#endif
}
/**
* pci_ext_cfg_enabled - can we access extended PCI config space?
* @dev: The PCI device of the root bridge.
*
* Returns 1 if we can access PCI extended config space (offsets
* greater than 0xff). This is the default implementation. Architecture
* implementations can override this.
*/
int __attribute__ ((weak)) pci_ext_cfg_avail(struct pci_dev *dev)
{
return 1;
}
static int __devinit pci_init(void)
{
struct pci_dev *dev = NULL;
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
pci_fixup_device(pci_fixup_final, dev);
}
return 0;
}
static int __init pci_setup(char *str)
{
while (str) {
char *k = strchr(str, ',');
if (k)
*k++ = 0;
if (*str && (str = pcibios_setup(str)) && *str) {
if (!strcmp(str, "nomsi")) {
pci_no_msi();
} else if (!strcmp(str, "noaer")) {
pci_no_aer();
} else if (!strcmp(str, "nodomains")) {
pci_no_domains();
} else if (!strncmp(str, "cbiosize=", 9)) {
pci_cardbus_io_size = memparse(str + 9, &str);
} else if (!strncmp(str, "cbmemsize=", 10)) {
pci_cardbus_mem_size = memparse(str + 10, &str);
} else {
printk(KERN_ERR "PCI: Unknown option `%s'\n",
str);
}
}
str = k;
}
return 0;
}
early_param("pci", pci_setup);
device_initcall(pci_init);
EXPORT_SYMBOL(pci_reenable_device);
EXPORT_SYMBOL(pci_enable_device_io);
EXPORT_SYMBOL(pci_enable_device_mem);
EXPORT_SYMBOL(pci_enable_device);
EXPORT_SYMBOL(pcim_enable_device);
EXPORT_SYMBOL(pcim_pin_device);
EXPORT_SYMBOL(pci_disable_device);
EXPORT_SYMBOL(pci_find_capability);
EXPORT_SYMBOL(pci_bus_find_capability);
EXPORT_SYMBOL(pci_release_regions);
EXPORT_SYMBOL(pci_request_regions);
EXPORT_SYMBOL(pci_request_regions_exclusive);
EXPORT_SYMBOL(pci_release_region);
EXPORT_SYMBOL(pci_request_region);
EXPORT_SYMBOL(pci_request_region_exclusive);
EXPORT_SYMBOL(pci_release_selected_regions);
EXPORT_SYMBOL(pci_request_selected_regions);
EXPORT_SYMBOL(pci_request_selected_regions_exclusive);
EXPORT_SYMBOL(pci_set_master);
EXPORT_SYMBOL(pci_set_mwi);
EXPORT_SYMBOL(pci_try_set_mwi);
EXPORT_SYMBOL(pci_clear_mwi);
EXPORT_SYMBOL_GPL(pci_intx);
EXPORT_SYMBOL(pci_set_dma_mask);
EXPORT_SYMBOL(pci_set_consistent_dma_mask);
EXPORT_SYMBOL(pci_assign_resource);
EXPORT_SYMBOL(pci_find_parent_resource);
EXPORT_SYMBOL(pci_select_bars);
EXPORT_SYMBOL(pci_set_power_state);
EXPORT_SYMBOL(pci_save_state);
EXPORT_SYMBOL(pci_restore_state);
EXPORT_SYMBOL(pci_pme_capable);
EXPORT_SYMBOL(pci_pme_active);
EXPORT_SYMBOL(pci_enable_wake);
EXPORT_SYMBOL(pci_wake_from_d3);
EXPORT_SYMBOL(pci_target_state);
EXPORT_SYMBOL(pci_prepare_to_sleep);
EXPORT_SYMBOL(pci_back_from_sleep);
EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);