From d08ca2ca743f324eceba59e93188f9439e966bce Mon Sep 17 00:00:00 2001 From: Len Brown Date: Fri, 16 Jan 2009 13:52:03 -0500 Subject: ACPI: rename main.c to sleep.c Signed-off-by: Len Brown --- drivers/acpi/Makefile | 2 +- drivers/acpi/main.c | 747 -------------------------------------------------- drivers/acpi/sleep.c | 747 ++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 748 insertions(+), 748 deletions(-) delete mode 100644 drivers/acpi/main.c create mode 100644 drivers/acpi/sleep.c diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index d80f4cc2e0da..65d90c720b5a 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -19,7 +19,7 @@ obj-y += osl.o utils.o reboot.o\ # sleep related files obj-y += wakeup.o -obj-y += main.o +obj-y += sleep.o obj-$(CONFIG_ACPI_SLEEP) += proc.o diff --git a/drivers/acpi/main.c b/drivers/acpi/main.c deleted file mode 100644 index 7e3c609cbef2..000000000000 --- a/drivers/acpi/main.c +++ /dev/null @@ -1,747 +0,0 @@ -/* - * sleep.c - ACPI sleep support. - * - * Copyright (c) 2005 Alexey Starikovskiy - * Copyright (c) 2004 David Shaohua Li - * Copyright (c) 2000-2003 Patrick Mochel - * Copyright (c) 2003 Open Source Development Lab - * - * This file is released under the GPLv2. - * - */ - -#include -#include -#include -#include -#include -#include - -#include - -#include -#include -#include "sleep.h" - -u8 sleep_states[ACPI_S_STATE_COUNT]; - -static void acpi_sleep_tts_switch(u32 acpi_state) -{ - union acpi_object in_arg = { ACPI_TYPE_INTEGER }; - struct acpi_object_list arg_list = { 1, &in_arg }; - acpi_status status = AE_OK; - - in_arg.integer.value = acpi_state; - status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); - if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { - /* - * OS can't evaluate the _TTS object correctly. Some warning - * message will be printed. But it won't break anything. - */ - printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); - } -} - -static int tts_notify_reboot(struct notifier_block *this, - unsigned long code, void *x) -{ - acpi_sleep_tts_switch(ACPI_STATE_S5); - return NOTIFY_DONE; -} - -static struct notifier_block tts_notifier = { - .notifier_call = tts_notify_reboot, - .next = NULL, - .priority = 0, -}; - -static int acpi_sleep_prepare(u32 acpi_state) -{ -#ifdef CONFIG_ACPI_SLEEP - /* do we have a wakeup address for S2 and S3? */ - if (acpi_state == ACPI_STATE_S3) { - if (!acpi_wakeup_address) { - return -EFAULT; - } - acpi_set_firmware_waking_vector( - (acpi_physical_address)acpi_wakeup_address); - - } - ACPI_FLUSH_CPU_CACHE(); - acpi_enable_wakeup_device_prep(acpi_state); -#endif - printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", - acpi_state); - acpi_enter_sleep_state_prep(acpi_state); - return 0; -} - -#ifdef CONFIG_ACPI_SLEEP -static u32 acpi_target_sleep_state = ACPI_STATE_S0; -/* - * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the - * user to request that behavior by using the 'acpi_old_suspend_ordering' - * kernel command line option that causes the following variable to be set. - */ -static bool old_suspend_ordering; - -void __init acpi_old_suspend_ordering(void) -{ - old_suspend_ordering = true; -} - -/* - * According to the ACPI specification the BIOS should make sure that ACPI is - * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still, - * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI - * on such systems during resume. Unfortunately that doesn't help in - * particularly pathological cases in which SCI_EN has to be set directly on - * resume, although the specification states very clearly that this flag is - * owned by the hardware. The set_sci_en_on_resume variable will be set in such - * cases. - */ -static bool set_sci_en_on_resume; -/* - * The ACPI specification wants us to save NVS memory regions during hibernation - * and to restore them during the subsequent resume. However, it is not certain - * if this mechanism is going to work on all machines, so we allow the user to - * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line - * option. - */ -static bool s4_no_nvs; - -void __init acpi_s4_no_nvs(void) -{ - s4_no_nvs = true; -} - -/** - * acpi_pm_disable_gpes - Disable the GPEs. - */ -static int acpi_pm_disable_gpes(void) -{ - acpi_disable_all_gpes(); - return 0; -} - -/** - * __acpi_pm_prepare - Prepare the platform to enter the target state. - * - * If necessary, set the firmware waking vector and do arch-specific - * nastiness to get the wakeup code to the waking vector. - */ -static int __acpi_pm_prepare(void) -{ - int error = acpi_sleep_prepare(acpi_target_sleep_state); - - if (error) - acpi_target_sleep_state = ACPI_STATE_S0; - return error; -} - -/** - * acpi_pm_prepare - Prepare the platform to enter the target sleep - * state and disable the GPEs. - */ -static int acpi_pm_prepare(void) -{ - int error = __acpi_pm_prepare(); - - if (!error) - acpi_disable_all_gpes(); - return error; -} - -/** - * acpi_pm_finish - Instruct the platform to leave a sleep state. - * - * This is called after we wake back up (or if entering the sleep state - * failed). - */ -static void acpi_pm_finish(void) -{ - u32 acpi_state = acpi_target_sleep_state; - - if (acpi_state == ACPI_STATE_S0) - return; - - printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", - acpi_state); - acpi_disable_wakeup_device(acpi_state); - acpi_leave_sleep_state(acpi_state); - - /* reset firmware waking vector */ - acpi_set_firmware_waking_vector((acpi_physical_address) 0); - - acpi_target_sleep_state = ACPI_STATE_S0; -} - -/** - * acpi_pm_end - Finish up suspend sequence. - */ -static void acpi_pm_end(void) -{ - /* - * This is necessary in case acpi_pm_finish() is not called during a - * failing transition to a sleep state. - */ - acpi_target_sleep_state = ACPI_STATE_S0; - acpi_sleep_tts_switch(acpi_target_sleep_state); -} -#else /* !CONFIG_ACPI_SLEEP */ -#define acpi_target_sleep_state ACPI_STATE_S0 -#endif /* CONFIG_ACPI_SLEEP */ - -#ifdef CONFIG_SUSPEND -extern void do_suspend_lowlevel(void); - -static u32 acpi_suspend_states[] = { - [PM_SUSPEND_ON] = ACPI_STATE_S0, - [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, - [PM_SUSPEND_MEM] = ACPI_STATE_S3, - [PM_SUSPEND_MAX] = ACPI_STATE_S5 -}; - -/** - * acpi_suspend_begin - Set the target system sleep state to the state - * associated with given @pm_state, if supported. - */ -static int acpi_suspend_begin(suspend_state_t pm_state) -{ - u32 acpi_state = acpi_suspend_states[pm_state]; - int error = 0; - - if (sleep_states[acpi_state]) { - acpi_target_sleep_state = acpi_state; - acpi_sleep_tts_switch(acpi_target_sleep_state); - } else { - printk(KERN_ERR "ACPI does not support this state: %d\n", - pm_state); - error = -ENOSYS; - } - return error; -} - -/** - * acpi_suspend_enter - Actually enter a sleep state. - * @pm_state: ignored - * - * Flush caches and go to sleep. For STR we have to call arch-specific - * assembly, which in turn call acpi_enter_sleep_state(). - * It's unfortunate, but it works. Please fix if you're feeling frisky. - */ -static int acpi_suspend_enter(suspend_state_t pm_state) -{ - acpi_status status = AE_OK; - unsigned long flags = 0; - u32 acpi_state = acpi_target_sleep_state; - - ACPI_FLUSH_CPU_CACHE(); - - /* Do arch specific saving of state. */ - if (acpi_state == ACPI_STATE_S3) { - int error = acpi_save_state_mem(); - - if (error) - return error; - } - - local_irq_save(flags); - acpi_enable_wakeup_device(acpi_state); - switch (acpi_state) { - case ACPI_STATE_S1: - barrier(); - status = acpi_enter_sleep_state(acpi_state); - break; - - case ACPI_STATE_S3: - do_suspend_lowlevel(); - break; - } - - /* If ACPI is not enabled by the BIOS, we need to enable it here. */ - if (set_sci_en_on_resume) - acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1); - else - acpi_enable(); - - /* Reprogram control registers and execute _BFS */ - acpi_leave_sleep_state_prep(acpi_state); - - /* ACPI 3.0 specs (P62) says that it's the responsibility - * of the OSPM to clear the status bit [ implying that the - * POWER_BUTTON event should not reach userspace ] - */ - if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) - acpi_clear_event(ACPI_EVENT_POWER_BUTTON); - - /* - * Disable and clear GPE status before interrupt is enabled. Some GPEs - * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. - * acpi_leave_sleep_state will reenable specific GPEs later - */ - acpi_disable_all_gpes(); - - local_irq_restore(flags); - printk(KERN_DEBUG "Back to C!\n"); - - /* restore processor state */ - if (acpi_state == ACPI_STATE_S3) - acpi_restore_state_mem(); - - return ACPI_SUCCESS(status) ? 0 : -EFAULT; -} - -static int acpi_suspend_state_valid(suspend_state_t pm_state) -{ - u32 acpi_state; - - switch (pm_state) { - case PM_SUSPEND_ON: - case PM_SUSPEND_STANDBY: - case PM_SUSPEND_MEM: - acpi_state = acpi_suspend_states[pm_state]; - - return sleep_states[acpi_state]; - default: - return 0; - } -} - -static struct platform_suspend_ops acpi_suspend_ops = { - .valid = acpi_suspend_state_valid, - .begin = acpi_suspend_begin, - .prepare = acpi_pm_prepare, - .enter = acpi_suspend_enter, - .finish = acpi_pm_finish, - .end = acpi_pm_end, -}; - -/** - * acpi_suspend_begin_old - Set the target system sleep state to the - * state associated with given @pm_state, if supported, and - * execute the _PTS control method. This function is used if the - * pre-ACPI 2.0 suspend ordering has been requested. - */ -static int acpi_suspend_begin_old(suspend_state_t pm_state) -{ - int error = acpi_suspend_begin(pm_state); - - if (!error) - error = __acpi_pm_prepare(); - return error; -} - -/* - * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has - * been requested. - */ -static struct platform_suspend_ops acpi_suspend_ops_old = { - .valid = acpi_suspend_state_valid, - .begin = acpi_suspend_begin_old, - .prepare = acpi_pm_disable_gpes, - .enter = acpi_suspend_enter, - .finish = acpi_pm_finish, - .end = acpi_pm_end, - .recover = acpi_pm_finish, -}; - -static int __init init_old_suspend_ordering(const struct dmi_system_id *d) -{ - old_suspend_ordering = true; - return 0; -} - -static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d) -{ - set_sci_en_on_resume = true; - return 0; -} - -static struct dmi_system_id __initdata acpisleep_dmi_table[] = { - { - .callback = init_old_suspend_ordering, - .ident = "Abit KN9 (nForce4 variant)", - .matches = { - DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), - DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), - }, - }, - { - .callback = init_old_suspend_ordering, - .ident = "HP xw4600 Workstation", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), - DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), - }, - }, - { - .callback = init_set_sci_en_on_resume, - .ident = "Apple MacBook 1,1", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), - DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"), - }, - }, - { - .callback = init_set_sci_en_on_resume, - .ident = "Apple MacMini 1,1", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), - DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"), - }, - }, - {}, -}; -#endif /* CONFIG_SUSPEND */ - -#ifdef CONFIG_HIBERNATION -static unsigned long s4_hardware_signature; -static struct acpi_table_facs *facs; -static bool nosigcheck; - -void __init acpi_no_s4_hw_signature(void) -{ - nosigcheck = true; -} - -static int acpi_hibernation_begin(void) -{ - int error; - - error = s4_no_nvs ? 0 : hibernate_nvs_alloc(); - if (!error) { - acpi_target_sleep_state = ACPI_STATE_S4; - acpi_sleep_tts_switch(acpi_target_sleep_state); - } - - return error; -} - -static int acpi_hibernation_pre_snapshot(void) -{ - int error = acpi_pm_prepare(); - - if (!error) - hibernate_nvs_save(); - - return error; -} - -static int acpi_hibernation_enter(void) -{ - acpi_status status = AE_OK; - unsigned long flags = 0; - - ACPI_FLUSH_CPU_CACHE(); - - local_irq_save(flags); - acpi_enable_wakeup_device(ACPI_STATE_S4); - /* This shouldn't return. If it returns, we have a problem */ - status = acpi_enter_sleep_state(ACPI_STATE_S4); - /* Reprogram control registers and execute _BFS */ - acpi_leave_sleep_state_prep(ACPI_STATE_S4); - local_irq_restore(flags); - - return ACPI_SUCCESS(status) ? 0 : -EFAULT; -} - -static void acpi_hibernation_finish(void) -{ - hibernate_nvs_free(); - acpi_pm_finish(); -} - -static void acpi_hibernation_leave(void) -{ - /* - * If ACPI is not enabled by the BIOS and the boot kernel, we need to - * enable it here. - */ - acpi_enable(); - /* Reprogram control registers and execute _BFS */ - acpi_leave_sleep_state_prep(ACPI_STATE_S4); - /* Check the hardware signature */ - if (facs && s4_hardware_signature != facs->hardware_signature) { - printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " - "cannot resume!\n"); - panic("ACPI S4 hardware signature mismatch"); - } - /* Restore the NVS memory area */ - hibernate_nvs_restore(); -} - -static void acpi_pm_enable_gpes(void) -{ - acpi_enable_all_runtime_gpes(); -} - -static struct platform_hibernation_ops acpi_hibernation_ops = { - .begin = acpi_hibernation_begin, - .end = acpi_pm_end, - .pre_snapshot = acpi_hibernation_pre_snapshot, - .finish = acpi_hibernation_finish, - .prepare = acpi_pm_prepare, - .enter = acpi_hibernation_enter, - .leave = acpi_hibernation_leave, - .pre_restore = acpi_pm_disable_gpes, - .restore_cleanup = acpi_pm_enable_gpes, -}; - -/** - * acpi_hibernation_begin_old - Set the target system sleep state to - * ACPI_STATE_S4 and execute the _PTS control method. This - * function is used if the pre-ACPI 2.0 suspend ordering has been - * requested. - */ -static int acpi_hibernation_begin_old(void) -{ - int error; - /* - * The _TTS object should always be evaluated before the _PTS object. - * When the old_suspended_ordering is true, the _PTS object is - * evaluated in the acpi_sleep_prepare. - */ - acpi_sleep_tts_switch(ACPI_STATE_S4); - - error = acpi_sleep_prepare(ACPI_STATE_S4); - - if (!error) { - if (!s4_no_nvs) - error = hibernate_nvs_alloc(); - if (!error) - acpi_target_sleep_state = ACPI_STATE_S4; - } - return error; -} - -static int acpi_hibernation_pre_snapshot_old(void) -{ - int error = acpi_pm_disable_gpes(); - - if (!error) - hibernate_nvs_save(); - - return error; -} - -/* - * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has - * been requested. - */ -static struct platform_hibernation_ops acpi_hibernation_ops_old = { - .begin = acpi_hibernation_begin_old, - .end = acpi_pm_end, - .pre_snapshot = acpi_hibernation_pre_snapshot_old, - .finish = acpi_hibernation_finish, - .prepare = acpi_pm_disable_gpes, - .enter = acpi_hibernation_enter, - .leave = acpi_hibernation_leave, - .pre_restore = acpi_pm_disable_gpes, - .restore_cleanup = acpi_pm_enable_gpes, - .recover = acpi_pm_finish, -}; -#endif /* CONFIG_HIBERNATION */ - -int acpi_suspend(u32 acpi_state) -{ - suspend_state_t states[] = { - [1] = PM_SUSPEND_STANDBY, - [3] = PM_SUSPEND_MEM, - [5] = PM_SUSPEND_MAX - }; - - if (acpi_state < 6 && states[acpi_state]) - return pm_suspend(states[acpi_state]); - if (acpi_state == 4) - return hibernate(); - return -EINVAL; -} - -#ifdef CONFIG_PM_SLEEP -/** - * acpi_pm_device_sleep_state - return preferred power state of ACPI device - * in the system sleep state given by %acpi_target_sleep_state - * @dev: device to examine; its driver model wakeup flags control - * whether it should be able to wake up the system - * @d_min_p: used to store the upper limit of allowed states range - * Return value: preferred power state of the device on success, -ENODEV on - * failure (ie. if there's no 'struct acpi_device' for @dev) - * - * Find the lowest power (highest number) ACPI device power state that - * device @dev can be in while the system is in the sleep state represented - * by %acpi_target_sleep_state. If @wake is nonzero, the device should be - * able to wake up the system from this sleep state. If @d_min_p is set, - * the highest power (lowest number) device power state of @dev allowed - * in this system sleep state is stored at the location pointed to by it. - * - * The caller must ensure that @dev is valid before using this function. - * The caller is also responsible for figuring out if the device is - * supposed to be able to wake up the system and passing this information - * via @wake. - */ - -int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) -{ - acpi_handle handle = DEVICE_ACPI_HANDLE(dev); - struct acpi_device *adev; - char acpi_method[] = "_SxD"; - unsigned long long d_min, d_max; - - if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { - printk(KERN_DEBUG "ACPI handle has no context!\n"); - return -ENODEV; - } - - acpi_method[2] = '0' + acpi_target_sleep_state; - /* - * If the sleep state is S0, we will return D3, but if the device has - * _S0W, we will use the value from _S0W - */ - d_min = ACPI_STATE_D0; - d_max = ACPI_STATE_D3; - - /* - * If present, _SxD methods return the minimum D-state (highest power - * state) we can use for the corresponding S-states. Otherwise, the - * minimum D-state is D0 (ACPI 3.x). - * - * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer - * provided -- that's our fault recovery, we ignore retval. - */ - if (acpi_target_sleep_state > ACPI_STATE_S0) - acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); - - /* - * If _PRW says we can wake up the system from the target sleep state, - * the D-state returned by _SxD is sufficient for that (we assume a - * wakeup-aware driver if wake is set). Still, if _SxW exists - * (ACPI 3.x), it should return the maximum (lowest power) D-state that - * can wake the system. _S0W may be valid, too. - */ - if (acpi_target_sleep_state == ACPI_STATE_S0 || - (device_may_wakeup(dev) && adev->wakeup.state.enabled && - adev->wakeup.sleep_state <= acpi_target_sleep_state)) { - acpi_status status; - - acpi_method[3] = 'W'; - status = acpi_evaluate_integer(handle, acpi_method, NULL, - &d_max); - if (ACPI_FAILURE(status)) { - d_max = d_min; - } else if (d_max < d_min) { - /* Warn the user of the broken DSDT */ - printk(KERN_WARNING "ACPI: Wrong value from %s\n", - acpi_method); - /* Sanitize it */ - d_min = d_max; - } - } - - if (d_min_p) - *d_min_p = d_min; - return d_max; -} - -/** - * acpi_pm_device_sleep_wake - enable or disable the system wake-up - * capability of given device - * @dev: device to handle - * @enable: 'true' - enable, 'false' - disable the wake-up capability - */ -int acpi_pm_device_sleep_wake(struct device *dev, bool enable) -{ - acpi_handle handle; - struct acpi_device *adev; - - if (!device_may_wakeup(dev)) - return -EINVAL; - - handle = DEVICE_ACPI_HANDLE(dev); - if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { - printk(KERN_DEBUG "ACPI handle has no context!\n"); - return -ENODEV; - } - - return enable ? - acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : - acpi_disable_wakeup_device_power(adev); -} -#endif - -static void acpi_power_off_prepare(void) -{ - /* Prepare to power off the system */ - acpi_sleep_prepare(ACPI_STATE_S5); - acpi_disable_all_gpes(); -} - -static void acpi_power_off(void) -{ - /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ - printk("%s called\n", __func__); - local_irq_disable(); - acpi_enable_wakeup_device(ACPI_STATE_S5); - acpi_enter_sleep_state(ACPI_STATE_S5); -} - -int __init acpi_sleep_init(void) -{ - acpi_status status; - u8 type_a, type_b; -#ifdef CONFIG_SUSPEND - int i = 0; - - dmi_check_system(acpisleep_dmi_table); -#endif - - if (acpi_disabled) - return 0; - - sleep_states[ACPI_STATE_S0] = 1; - printk(KERN_INFO PREFIX "(supports S0"); - -#ifdef CONFIG_SUSPEND - for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { - status = acpi_get_sleep_type_data(i, &type_a, &type_b); - if (ACPI_SUCCESS(status)) { - sleep_states[i] = 1; - printk(" S%d", i); - } - } - - suspend_set_ops(old_suspend_ordering ? - &acpi_suspend_ops_old : &acpi_suspend_ops); -#endif - -#ifdef CONFIG_HIBERNATION - status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); - if (ACPI_SUCCESS(status)) { - hibernation_set_ops(old_suspend_ordering ? - &acpi_hibernation_ops_old : &acpi_hibernation_ops); - sleep_states[ACPI_STATE_S4] = 1; - printk(" S4"); - if (!nosigcheck) { - acpi_get_table(ACPI_SIG_FACS, 1, - (struct acpi_table_header **)&facs); - if (facs) - s4_hardware_signature = - facs->hardware_signature; - } - } -#endif - status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); - if (ACPI_SUCCESS(status)) { - sleep_states[ACPI_STATE_S5] = 1; - printk(" S5"); - pm_power_off_prepare = acpi_power_off_prepare; - pm_power_off = acpi_power_off; - } - printk(")\n"); - /* - * Register the tts_notifier to reboot notifier list so that the _TTS - * object can also be evaluated when the system enters S5. - */ - register_reboot_notifier(&tts_notifier); - return 0; -} diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c new file mode 100644 index 000000000000..7e3c609cbef2 --- /dev/null +++ b/drivers/acpi/sleep.c @@ -0,0 +1,747 @@ +/* + * sleep.c - ACPI sleep support. + * + * Copyright (c) 2005 Alexey Starikovskiy + * Copyright (c) 2004 David Shaohua Li + * Copyright (c) 2000-2003 Patrick Mochel + * Copyright (c) 2003 Open Source Development Lab + * + * This file is released under the GPLv2. + * + */ + +#include +#include +#include +#include +#include +#include + +#include + +#include +#include +#include "sleep.h" + +u8 sleep_states[ACPI_S_STATE_COUNT]; + +static void acpi_sleep_tts_switch(u32 acpi_state) +{ + union acpi_object in_arg = { ACPI_TYPE_INTEGER }; + struct acpi_object_list arg_list = { 1, &in_arg }; + acpi_status status = AE_OK; + + in_arg.integer.value = acpi_state; + status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { + /* + * OS can't evaluate the _TTS object correctly. Some warning + * message will be printed. But it won't break anything. + */ + printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); + } +} + +static int tts_notify_reboot(struct notifier_block *this, + unsigned long code, void *x) +{ + acpi_sleep_tts_switch(ACPI_STATE_S5); + return NOTIFY_DONE; +} + +static struct notifier_block tts_notifier = { + .notifier_call = tts_notify_reboot, + .next = NULL, + .priority = 0, +}; + +static int acpi_sleep_prepare(u32 acpi_state) +{ +#ifdef CONFIG_ACPI_SLEEP + /* do we have a wakeup address for S2 and S3? */ + if (acpi_state == ACPI_STATE_S3) { + if (!acpi_wakeup_address) { + return -EFAULT; + } + acpi_set_firmware_waking_vector( + (acpi_physical_address)acpi_wakeup_address); + + } + ACPI_FLUSH_CPU_CACHE(); + acpi_enable_wakeup_device_prep(acpi_state); +#endif + printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", + acpi_state); + acpi_enter_sleep_state_prep(acpi_state); + return 0; +} + +#ifdef CONFIG_ACPI_SLEEP +static u32 acpi_target_sleep_state = ACPI_STATE_S0; +/* + * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the + * user to request that behavior by using the 'acpi_old_suspend_ordering' + * kernel command line option that causes the following variable to be set. + */ +static bool old_suspend_ordering; + +void __init acpi_old_suspend_ordering(void) +{ + old_suspend_ordering = true; +} + +/* + * According to the ACPI specification the BIOS should make sure that ACPI is + * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still, + * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI + * on such systems during resume. Unfortunately that doesn't help in + * particularly pathological cases in which SCI_EN has to be set directly on + * resume, although the specification states very clearly that this flag is + * owned by the hardware. The set_sci_en_on_resume variable will be set in such + * cases. + */ +static bool set_sci_en_on_resume; +/* + * The ACPI specification wants us to save NVS memory regions during hibernation + * and to restore them during the subsequent resume. However, it is not certain + * if this mechanism is going to work on all machines, so we allow the user to + * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line + * option. + */ +static bool s4_no_nvs; + +void __init acpi_s4_no_nvs(void) +{ + s4_no_nvs = true; +} + +/** + * acpi_pm_disable_gpes - Disable the GPEs. + */ +static int acpi_pm_disable_gpes(void) +{ + acpi_disable_all_gpes(); + return 0; +} + +/** + * __acpi_pm_prepare - Prepare the platform to enter the target state. + * + * If necessary, set the firmware waking vector and do arch-specific + * nastiness to get the wakeup code to the waking vector. + */ +static int __acpi_pm_prepare(void) +{ + int error = acpi_sleep_prepare(acpi_target_sleep_state); + + if (error) + acpi_target_sleep_state = ACPI_STATE_S0; + return error; +} + +/** + * acpi_pm_prepare - Prepare the platform to enter the target sleep + * state and disable the GPEs. + */ +static int acpi_pm_prepare(void) +{ + int error = __acpi_pm_prepare(); + + if (!error) + acpi_disable_all_gpes(); + return error; +} + +/** + * acpi_pm_finish - Instruct the platform to leave a sleep state. + * + * This is called after we wake back up (or if entering the sleep state + * failed). + */ +static void acpi_pm_finish(void) +{ + u32 acpi_state = acpi_target_sleep_state; + + if (acpi_state == ACPI_STATE_S0) + return; + + printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", + acpi_state); + acpi_disable_wakeup_device(acpi_state); + acpi_leave_sleep_state(acpi_state); + + /* reset firmware waking vector */ + acpi_set_firmware_waking_vector((acpi_physical_address) 0); + + acpi_target_sleep_state = ACPI_STATE_S0; +} + +/** + * acpi_pm_end - Finish up suspend sequence. + */ +static void acpi_pm_end(void) +{ + /* + * This is necessary in case acpi_pm_finish() is not called during a + * failing transition to a sleep state. + */ + acpi_target_sleep_state = ACPI_STATE_S0; + acpi_sleep_tts_switch(acpi_target_sleep_state); +} +#else /* !CONFIG_ACPI_SLEEP */ +#define acpi_target_sleep_state ACPI_STATE_S0 +#endif /* CONFIG_ACPI_SLEEP */ + +#ifdef CONFIG_SUSPEND +extern void do_suspend_lowlevel(void); + +static u32 acpi_suspend_states[] = { + [PM_SUSPEND_ON] = ACPI_STATE_S0, + [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, + [PM_SUSPEND_MEM] = ACPI_STATE_S3, + [PM_SUSPEND_MAX] = ACPI_STATE_S5 +}; + +/** + * acpi_suspend_begin - Set the target system sleep state to the state + * associated with given @pm_state, if supported. + */ +static int acpi_suspend_begin(suspend_state_t pm_state) +{ + u32 acpi_state = acpi_suspend_states[pm_state]; + int error = 0; + + if (sleep_states[acpi_state]) { + acpi_target_sleep_state = acpi_state; + acpi_sleep_tts_switch(acpi_target_sleep_state); + } else { + printk(KERN_ERR "ACPI does not support this state: %d\n", + pm_state); + error = -ENOSYS; + } + return error; +} + +/** + * acpi_suspend_enter - Actually enter a sleep state. + * @pm_state: ignored + * + * Flush caches and go to sleep. For STR we have to call arch-specific + * assembly, which in turn call acpi_enter_sleep_state(). + * It's unfortunate, but it works. Please fix if you're feeling frisky. + */ +static int acpi_suspend_enter(suspend_state_t pm_state) +{ + acpi_status status = AE_OK; + unsigned long flags = 0; + u32 acpi_state = acpi_target_sleep_state; + + ACPI_FLUSH_CPU_CACHE(); + + /* Do arch specific saving of state. */ + if (acpi_state == ACPI_STATE_S3) { + int error = acpi_save_state_mem(); + + if (error) + return error; + } + + local_irq_save(flags); + acpi_enable_wakeup_device(acpi_state); + switch (acpi_state) { + case ACPI_STATE_S1: + barrier(); + status = acpi_enter_sleep_state(acpi_state); + break; + + case ACPI_STATE_S3: + do_suspend_lowlevel(); + break; + } + + /* If ACPI is not enabled by the BIOS, we need to enable it here. */ + if (set_sci_en_on_resume) + acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1); + else + acpi_enable(); + + /* Reprogram control registers and execute _BFS */ + acpi_leave_sleep_state_prep(acpi_state); + + /* ACPI 3.0 specs (P62) says that it's the responsibility + * of the OSPM to clear the status bit [ implying that the + * POWER_BUTTON event should not reach userspace ] + */ + if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) + acpi_clear_event(ACPI_EVENT_POWER_BUTTON); + + /* + * Disable and clear GPE status before interrupt is enabled. Some GPEs + * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. + * acpi_leave_sleep_state will reenable specific GPEs later + */ + acpi_disable_all_gpes(); + + local_irq_restore(flags); + printk(KERN_DEBUG "Back to C!\n"); + + /* restore processor state */ + if (acpi_state == ACPI_STATE_S3) + acpi_restore_state_mem(); + + return ACPI_SUCCESS(status) ? 0 : -EFAULT; +} + +static int acpi_suspend_state_valid(suspend_state_t pm_state) +{ + u32 acpi_state; + + switch (pm_state) { + case PM_SUSPEND_ON: + case PM_SUSPEND_STANDBY: + case PM_SUSPEND_MEM: + acpi_state = acpi_suspend_states[pm_state]; + + return sleep_states[acpi_state]; + default: + return 0; + } +} + +static struct platform_suspend_ops acpi_suspend_ops = { + .valid = acpi_suspend_state_valid, + .begin = acpi_suspend_begin, + .prepare = acpi_pm_prepare, + .enter = acpi_suspend_enter, + .finish = acpi_pm_finish, + .end = acpi_pm_end, +}; + +/** + * acpi_suspend_begin_old - Set the target system sleep state to the + * state associated with given @pm_state, if supported, and + * execute the _PTS control method. This function is used if the + * pre-ACPI 2.0 suspend ordering has been requested. + */ +static int acpi_suspend_begin_old(suspend_state_t pm_state) +{ + int error = acpi_suspend_begin(pm_state); + + if (!error) + error = __acpi_pm_prepare(); + return error; +} + +/* + * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has + * been requested. + */ +static struct platform_suspend_ops acpi_suspend_ops_old = { + .valid = acpi_suspend_state_valid, + .begin = acpi_suspend_begin_old, + .prepare = acpi_pm_disable_gpes, + .enter = acpi_suspend_enter, + .finish = acpi_pm_finish, + .end = acpi_pm_end, + .recover = acpi_pm_finish, +}; + +static int __init init_old_suspend_ordering(const struct dmi_system_id *d) +{ + old_suspend_ordering = true; + return 0; +} + +static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d) +{ + set_sci_en_on_resume = true; + return 0; +} + +static struct dmi_system_id __initdata acpisleep_dmi_table[] = { + { + .callback = init_old_suspend_ordering, + .ident = "Abit KN9 (nForce4 variant)", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), + DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), + }, + }, + { + .callback = init_old_suspend_ordering, + .ident = "HP xw4600 Workstation", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), + }, + }, + { + .callback = init_set_sci_en_on_resume, + .ident = "Apple MacBook 1,1", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"), + }, + }, + { + .callback = init_set_sci_en_on_resume, + .ident = "Apple MacMini 1,1", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"), + }, + }, + {}, +}; +#endif /* CONFIG_SUSPEND */ + +#ifdef CONFIG_HIBERNATION +static unsigned long s4_hardware_signature; +static struct acpi_table_facs *facs; +static bool nosigcheck; + +void __init acpi_no_s4_hw_signature(void) +{ + nosigcheck = true; +} + +static int acpi_hibernation_begin(void) +{ + int error; + + error = s4_no_nvs ? 0 : hibernate_nvs_alloc(); + if (!error) { + acpi_target_sleep_state = ACPI_STATE_S4; + acpi_sleep_tts_switch(acpi_target_sleep_state); + } + + return error; +} + +static int acpi_hibernation_pre_snapshot(void) +{ + int error = acpi_pm_prepare(); + + if (!error) + hibernate_nvs_save(); + + return error; +} + +static int acpi_hibernation_enter(void) +{ + acpi_status status = AE_OK; + unsigned long flags = 0; + + ACPI_FLUSH_CPU_CACHE(); + + local_irq_save(flags); + acpi_enable_wakeup_device(ACPI_STATE_S4); + /* This shouldn't return. If it returns, we have a problem */ + status = acpi_enter_sleep_state(ACPI_STATE_S4); + /* Reprogram control registers and execute _BFS */ + acpi_leave_sleep_state_prep(ACPI_STATE_S4); + local_irq_restore(flags); + + return ACPI_SUCCESS(status) ? 0 : -EFAULT; +} + +static void acpi_hibernation_finish(void) +{ + hibernate_nvs_free(); + acpi_pm_finish(); +} + +static void acpi_hibernation_leave(void) +{ + /* + * If ACPI is not enabled by the BIOS and the boot kernel, we need to + * enable it here. + */ + acpi_enable(); + /* Reprogram control registers and execute _BFS */ + acpi_leave_sleep_state_prep(ACPI_STATE_S4); + /* Check the hardware signature */ + if (facs && s4_hardware_signature != facs->hardware_signature) { + printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " + "cannot resume!\n"); + panic("ACPI S4 hardware signature mismatch"); + } + /* Restore the NVS memory area */ + hibernate_nvs_restore(); +} + +static void acpi_pm_enable_gpes(void) +{ + acpi_enable_all_runtime_gpes(); +} + +static struct platform_hibernation_ops acpi_hibernation_ops = { + .begin = acpi_hibernation_begin, + .end = acpi_pm_end, + .pre_snapshot = acpi_hibernation_pre_snapshot, + .finish = acpi_hibernation_finish, + .prepare = acpi_pm_prepare, + .enter = acpi_hibernation_enter, + .leave = acpi_hibernation_leave, + .pre_restore = acpi_pm_disable_gpes, + .restore_cleanup = acpi_pm_enable_gpes, +}; + +/** + * acpi_hibernation_begin_old - Set the target system sleep state to + * ACPI_STATE_S4 and execute the _PTS control method. This + * function is used if the pre-ACPI 2.0 suspend ordering has been + * requested. + */ +static int acpi_hibernation_begin_old(void) +{ + int error; + /* + * The _TTS object should always be evaluated before the _PTS object. + * When the old_suspended_ordering is true, the _PTS object is + * evaluated in the acpi_sleep_prepare. + */ + acpi_sleep_tts_switch(ACPI_STATE_S4); + + error = acpi_sleep_prepare(ACPI_STATE_S4); + + if (!error) { + if (!s4_no_nvs) + error = hibernate_nvs_alloc(); + if (!error) + acpi_target_sleep_state = ACPI_STATE_S4; + } + return error; +} + +static int acpi_hibernation_pre_snapshot_old(void) +{ + int error = acpi_pm_disable_gpes(); + + if (!error) + hibernate_nvs_save(); + + return error; +} + +/* + * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has + * been requested. + */ +static struct platform_hibernation_ops acpi_hibernation_ops_old = { + .begin = acpi_hibernation_begin_old, + .end = acpi_pm_end, + .pre_snapshot = acpi_hibernation_pre_snapshot_old, + .finish = acpi_hibernation_finish, + .prepare = acpi_pm_disable_gpes, + .enter = acpi_hibernation_enter, + .leave = acpi_hibernation_leave, + .pre_restore = acpi_pm_disable_gpes, + .restore_cleanup = acpi_pm_enable_gpes, + .recover = acpi_pm_finish, +}; +#endif /* CONFIG_HIBERNATION */ + +int acpi_suspend(u32 acpi_state) +{ + suspend_state_t states[] = { + [1] = PM_SUSPEND_STANDBY, + [3] = PM_SUSPEND_MEM, + [5] = PM_SUSPEND_MAX + }; + + if (acpi_state < 6 && states[acpi_state]) + return pm_suspend(states[acpi_state]); + if (acpi_state == 4) + return hibernate(); + return -EINVAL; +} + +#ifdef CONFIG_PM_SLEEP +/** + * acpi_pm_device_sleep_state - return preferred power state of ACPI device + * in the system sleep state given by %acpi_target_sleep_state + * @dev: device to examine; its driver model wakeup flags control + * whether it should be able to wake up the system + * @d_min_p: used to store the upper limit of allowed states range + * Return value: preferred power state of the device on success, -ENODEV on + * failure (ie. if there's no 'struct acpi_device' for @dev) + * + * Find the lowest power (highest number) ACPI device power state that + * device @dev can be in while the system is in the sleep state represented + * by %acpi_target_sleep_state. If @wake is nonzero, the device should be + * able to wake up the system from this sleep state. If @d_min_p is set, + * the highest power (lowest number) device power state of @dev allowed + * in this system sleep state is stored at the location pointed to by it. + * + * The caller must ensure that @dev is valid before using this function. + * The caller is also responsible for figuring out if the device is + * supposed to be able to wake up the system and passing this information + * via @wake. + */ + +int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) +{ + acpi_handle handle = DEVICE_ACPI_HANDLE(dev); + struct acpi_device *adev; + char acpi_method[] = "_SxD"; + unsigned long long d_min, d_max; + + if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { + printk(KERN_DEBUG "ACPI handle has no context!\n"); + return -ENODEV; + } + + acpi_method[2] = '0' + acpi_target_sleep_state; + /* + * If the sleep state is S0, we will return D3, but if the device has + * _S0W, we will use the value from _S0W + */ + d_min = ACPI_STATE_D0; + d_max = ACPI_STATE_D3; + + /* + * If present, _SxD methods return the minimum D-state (highest power + * state) we can use for the corresponding S-states. Otherwise, the + * minimum D-state is D0 (ACPI 3.x). + * + * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer + * provided -- that's our fault recovery, we ignore retval. + */ + if (acpi_target_sleep_state > ACPI_STATE_S0) + acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); + + /* + * If _PRW says we can wake up the system from the target sleep state, + * the D-state returned by _SxD is sufficient for that (we assume a + * wakeup-aware driver if wake is set). Still, if _SxW exists + * (ACPI 3.x), it should return the maximum (lowest power) D-state that + * can wake the system. _S0W may be valid, too. + */ + if (acpi_target_sleep_state == ACPI_STATE_S0 || + (device_may_wakeup(dev) && adev->wakeup.state.enabled && + adev->wakeup.sleep_state <= acpi_target_sleep_state)) { + acpi_status status; + + acpi_method[3] = 'W'; + status = acpi_evaluate_integer(handle, acpi_method, NULL, + &d_max); + if (ACPI_FAILURE(status)) { + d_max = d_min; + } else if (d_max < d_min) { + /* Warn the user of the broken DSDT */ + printk(KERN_WARNING "ACPI: Wrong value from %s\n", + acpi_method); + /* Sanitize it */ + d_min = d_max; + } + } + + if (d_min_p) + *d_min_p = d_min; + return d_max; +} + +/** + * acpi_pm_device_sleep_wake - enable or disable the system wake-up + * capability of given device + * @dev: device to handle + * @enable: 'true' - enable, 'false' - disable the wake-up capability + */ +int acpi_pm_device_sleep_wake(struct device *dev, bool enable) +{ + acpi_handle handle; + struct acpi_device *adev; + + if (!device_may_wakeup(dev)) + return -EINVAL; + + handle = DEVICE_ACPI_HANDLE(dev); + if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { + printk(KERN_DEBUG "ACPI handle has no context!\n"); + return -ENODEV; + } + + return enable ? + acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : + acpi_disable_wakeup_device_power(adev); +} +#endif + +static void acpi_power_off_prepare(void) +{ + /* Prepare to power off the system */ + acpi_sleep_prepare(ACPI_STATE_S5); + acpi_disable_all_gpes(); +} + +static void acpi_power_off(void) +{ + /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ + printk("%s called\n", __func__); + local_irq_disable(); + acpi_enable_wakeup_device(ACPI_STATE_S5); + acpi_enter_sleep_state(ACPI_STATE_S5); +} + +int __init acpi_sleep_init(void) +{ + acpi_status status; + u8 type_a, type_b; +#ifdef CONFIG_SUSPEND + int i = 0; + + dmi_check_system(acpisleep_dmi_table); +#endif + + if (acpi_disabled) + return 0; + + sleep_states[ACPI_STATE_S0] = 1; + printk(KERN_INFO PREFIX "(supports S0"); + +#ifdef CONFIG_SUSPEND + for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { + status = acpi_get_sleep_type_data(i, &type_a, &type_b); + if (ACPI_SUCCESS(status)) { + sleep_states[i] = 1; + printk(" S%d", i); + } + } + + suspend_set_ops(old_suspend_ordering ? + &acpi_suspend_ops_old : &acpi_suspend_ops); +#endif + +#ifdef CONFIG_HIBERNATION + status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); + if (ACPI_SUCCESS(status)) { + hibernation_set_ops(old_suspend_ordering ? + &acpi_hibernation_ops_old : &acpi_hibernation_ops); + sleep_states[ACPI_STATE_S4] = 1; + printk(" S4"); + if (!nosigcheck) { + acpi_get_table(ACPI_SIG_FACS, 1, + (struct acpi_table_header **)&facs); + if (facs) + s4_hardware_signature = + facs->hardware_signature; + } + } +#endif + status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); + if (ACPI_SUCCESS(status)) { + sleep_states[ACPI_STATE_S5] = 1; + printk(" S5"); + pm_power_off_prepare = acpi_power_off_prepare; + pm_power_off = acpi_power_off; + } + printk(")\n"); + /* + * Register the tts_notifier to reboot notifier list so that the _TTS + * object can also be evaluated when the system enters S5. + */ + register_reboot_notifier(&tts_notifier); + return 0; +} -- cgit v1.2.2