/* * 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 <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #include "sleep.h" u8 sleep_states[ACPI_S_STATE_COUNT]; static struct pm_ops acpi_pm_ops; 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_DISK] = ACPI_STATE_S4, [PM_SUSPEND_MAX] = ACPI_STATE_S5 }; static int init_8259A_after_S1; /** * acpi_pm_prepare - Do preliminary suspend work. * @pm_state: suspend state we're entering. * * Make sure we support the state. If we do, and we need it, set the * firmware waking vector and do arch-specific nastiness to get the * wakeup code to the waking vector. */ extern int acpi_sleep_prepare(u32 acpi_state); extern void acpi_power_off(void); static int acpi_pm_prepare(suspend_state_t pm_state) { u32 acpi_state = acpi_suspend_states[pm_state]; if (!sleep_states[acpi_state]) { printk("acpi_pm_prepare does not support %d \n", pm_state); return -EPERM; } return acpi_sleep_prepare(acpi_state); } /** * acpi_pm_enter - Actually enter a sleep state. * @pm_state: State we're entering. * * Flush caches and go to sleep. For STR or STD, 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_pm_enter(suspend_state_t pm_state) { acpi_status status = AE_OK; unsigned long flags = 0; u32 acpi_state = acpi_suspend_states[pm_state]; ACPI_FLUSH_CPU_CACHE(); /* Do arch specific saving of state. */ if (pm_state > PM_SUSPEND_STANDBY) { int error = acpi_save_state_mem(); if (error) return error; } local_irq_save(flags); acpi_enable_wakeup_device(acpi_state); switch (pm_state) { case PM_SUSPEND_STANDBY: barrier(); status = acpi_enter_sleep_state(acpi_state); break; case PM_SUSPEND_MEM: do_suspend_lowlevel(); break; case PM_SUSPEND_DISK: if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM) status = acpi_enter_sleep_state(acpi_state); break; case PM_SUSPEND_MAX: acpi_power_off(); break; default: return -EINVAL; } /* ACPI 3.0 specs (P62) says that it's the responsabilty * 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); local_irq_restore(flags); printk(KERN_DEBUG "Back to C!\n"); /* restore processor state * We should only be here if we're coming back from STR or STD. * And, in the case of the latter, the memory image should have already * been loaded from disk. */ if (pm_state > PM_SUSPEND_STANDBY) acpi_restore_state_mem(); return ACPI_SUCCESS(status) ? 0 : -EFAULT; } /** * acpi_pm_finish - Finish up suspend sequence. * @pm_state: State we're coming out of. * * This is called after we wake back up (or if entering the sleep state * failed). */ static int acpi_pm_finish(suspend_state_t pm_state) { u32 acpi_state = acpi_suspend_states[pm_state]; acpi_leave_sleep_state(acpi_state); acpi_disable_wakeup_device(acpi_state); /* reset firmware waking vector */ acpi_set_firmware_waking_vector((acpi_physical_address) 0); if (init_8259A_after_S1) { printk("Broken toshiba laptop -> kicking interrupts\n"); init_8259A(0); } return 0; } int acpi_suspend(u32 acpi_state) { suspend_state_t states[] = { [1] = PM_SUSPEND_STANDBY, [3] = PM_SUSPEND_MEM, [4] = PM_SUSPEND_DISK, [5] = PM_SUSPEND_MAX }; if (acpi_state < 6 && states[acpi_state]) return pm_suspend(states[acpi_state]); return -EINVAL; } static int acpi_pm_state_valid(suspend_state_t pm_state) { u32 acpi_state = acpi_suspend_states[pm_state]; return sleep_states[acpi_state]; } static struct pm_ops acpi_pm_ops = { .valid = acpi_pm_state_valid, .prepare = acpi_pm_prepare, .enter = acpi_pm_enter, .finish = acpi_pm_finish, }; /* * Toshiba fails to preserve interrupts over S1, reinitialization * of 8259 is needed after S1 resume. */ static int __init init_ints_after_s1(struct dmi_system_id *d) { printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident); init_8259A_after_S1 = 1; return 0; } static struct dmi_system_id __initdata acpisleep_dmi_table[] = { { .callback = init_ints_after_s1, .ident = "Toshiba Satellite 4030cdt", .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),}, }, {}, }; int __init acpi_sleep_init(void) { int i = 0; dmi_check_system(acpisleep_dmi_table); if (acpi_disabled) return 0; printk(KERN_INFO PREFIX "(supports"); for (i = 0; i < ACPI_S_STATE_COUNT; i++) { acpi_status status; u8 type_a, type_b; status = acpi_get_sleep_type_data(i, &type_a, &type_b); if (ACPI_SUCCESS(status)) { sleep_states[i] = 1; printk(" S%d", i); } if (i == ACPI_STATE_S4) { if (sleep_states[i]) acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM; } } printk(")\n"); pm_set_ops(&acpi_pm_ops); return 0; }