/* * sleep.c - ACPI sleep support. * * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> * Copyright (c) 2000-2003 Patrick Mochel * Copyright (c) 2003 Open Source Development Lab * * This file is released under the GPLv2. * */ #include <linux/delay.h> #include <linux/irq.h> #include <linux/dmi.h> #include <linux/device.h> #include <linux/suspend.h> #include <asm/io.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #include "sleep.h" u8 sleep_states[ACPI_S_STATE_COUNT]; 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_PM_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; } /** * acpi_pm_disable_gpes - Disable the GPEs. */ static int acpi_pm_disable_gpes(void) { acpi_hw_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_hw_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; } #endif /* CONFIG_PM_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; } 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; } /* 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_hw_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 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)"), }, }, {}, }; #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) { acpi_target_sleep_state = ACPI_STATE_S4; return 0; } 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_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"); } } static void acpi_pm_enable_gpes(void) { acpi_hw_enable_all_runtime_gpes(); } static struct platform_hibernation_ops acpi_hibernation_ops = { .begin = acpi_hibernation_begin, .end = acpi_pm_end, .pre_snapshot = acpi_pm_prepare, .finish = acpi_pm_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 = acpi_sleep_prepare(ACPI_STATE_S4); if (!error) acpi_target_sleep_state = ACPI_STATE_S4; 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_pm_disable_gpes, .finish = acpi_pm_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 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_hw_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_by_index(ACPI_TABLE_INDEX_FACS, (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"); return 0; }