diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-acpi.c | 19 | ||||
| -rw-r--r-- | drivers/pci/pci.c | 40 | ||||
| -rw-r--r-- | drivers/pci/pci.h | 26 |
3 files changed, 65 insertions, 20 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 056ea80ee27..e4df71ab79b 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -215,7 +215,6 @@ acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) } EXPORT_SYMBOL(pci_osc_control_set); -#ifdef CONFIG_ACPI_SLEEP /* * _SxD returns the D-state with the highest power * (lowest D-state number) supported in the S-state "x". @@ -259,7 +258,13 @@ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) } return PCI_POWER_ERROR; } -#endif + +static bool acpi_pci_power_manageable(struct pci_dev *dev) +{ + acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); + + return handle ? acpi_bus_power_manageable(handle) : false; +} static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) { @@ -290,6 +295,11 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) return -EINVAL; } +static struct pci_platform_pm_ops acpi_pci_platform_pm = { + .is_manageable = acpi_pci_power_manageable, + .set_state = acpi_pci_set_power_state, + .choose_state = acpi_pci_choose_state, +}; /* ACPI bus type */ static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) @@ -341,10 +351,7 @@ static int __init acpi_pci_init(void) ret = register_acpi_bus_type(&acpi_pci_bus); if (ret) return 0; -#ifdef CONFIG_ACPI_SLEEP - platform_pci_choose_state = acpi_pci_choose_state; -#endif - platform_pci_set_power_state = acpi_pci_set_power_state; + pci_set_platform_pm(&acpi_pci_platform_pm); return 0; } arch_initcall(acpi_pci_init); diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 8e8ecc1da93..f8074525267 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -376,7 +376,32 @@ pci_restore_bars(struct pci_dev *dev) pci_update_resource(dev, &dev->resource[i], i); } -int (*platform_pci_set_power_state)(struct pci_dev *dev, pci_power_t t); +static struct pci_platform_pm_ops *pci_platform_pm; + +int pci_set_platform_pm(struct pci_platform_pm_ops *ops) +{ + if (!ops->is_manageable || !ops->set_state || !ops->choose_state) + 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_set_power_state - Set the power state of a PCI device @@ -479,8 +504,7 @@ pci_set_power_state(struct pci_dev *dev, pci_power_t state) * Give firmware a chance to be called, such as ACPI _PRx, _PSx * Firmware method after native method ? */ - if (platform_pci_set_power_state) - platform_pci_set_power_state(dev, state); + platform_pci_set_power_state(dev, state); dev->current_state = state; @@ -505,8 +529,6 @@ pci_set_power_state(struct pci_dev *dev, pci_power_t state) return 0; } -pci_power_t (*platform_pci_choose_state)(struct pci_dev *dev); - /** * pci_choose_state - Choose the power state of a PCI device * @dev: PCI device to be suspended @@ -524,11 +546,9 @@ pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state) if (!pci_find_capability(dev, PCI_CAP_ID_PM)) return PCI_D0; - if (platform_pci_choose_state) { - ret = platform_pci_choose_state(dev); - if (ret != PCI_POWER_ERROR) - return ret; - } + ret = platform_pci_choose_state(dev); + if (ret != PCI_POWER_ERROR) + return ret; switch (state.event) { case PM_EVENT_ON: diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index e0eff35825a..0cd2e719933 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -5,10 +5,28 @@ extern int pci_create_sysfs_dev_files(struct pci_dev *pdev); extern void pci_remove_sysfs_dev_files(struct pci_dev *pdev); extern void pci_cleanup_rom(struct pci_dev *dev); -/* Firmware callbacks */ -extern pci_power_t (*platform_pci_choose_state)(struct pci_dev *dev); -extern int (*platform_pci_set_power_state)(struct pci_dev *dev, - pci_power_t state); +/** + * Firmware PM callbacks + * + * @is_manageable - returns 'true' if given device is power manageable by the + * platform firmware + * + * @set_state - invokes the platform firmware to set the device's power state + * + * @choose_state - returns PCI power state of given device preferred by the + * platform; to be used during system-wide transitions from a + * sleeping state to the working state and vice versa + * + * If given platform is generally capable of power managing PCI devices, all of + * these callbacks are mandatory. + */ +struct pci_platform_pm_ops { + bool (*is_manageable)(struct pci_dev *dev); + int (*set_state)(struct pci_dev *dev, pci_power_t state); + pci_power_t (*choose_state)(struct pci_dev *dev); +}; + +extern int pci_set_platform_pm(struct pci_platform_pm_ops *ops); extern int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val); extern int pci_user_read_config_word(struct pci_dev *dev, int where, u16 *val); |