diff options
Diffstat (limited to 'drivers/acpi/sleep/main.c')
| -rw-r--r-- | drivers/acpi/sleep/main.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c new file mode 100644 index 000000000000..0a5d2a94131e --- /dev/null +++ b/drivers/acpi/sleep/main.c @@ -0,0 +1,234 @@ +/* + * sleep.c - ACPI sleep support. + * + * 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 struct pm_ops acpi_pm_ops; + +extern void do_suspend_lowlevel_s4bios(void); +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, +}; + +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. + */ + +static int acpi_pm_prepare(suspend_state_t pm_state) +{ + u32 acpi_state = acpi_suspend_states[pm_state]; + + if (!sleep_states[acpi_state]) + return -EPERM; + + /* do we have a wakeup address for S2 and S3? */ + /* Here, we support only S4BIOS, those we set the wakeup address */ + /* S4OS is only supported for now via swsusp.. */ + if (pm_state == PM_SUSPEND_MEM || pm_state == PM_SUSPEND_DISK) { + if (!acpi_wakeup_address) + return -EFAULT; + acpi_set_firmware_waking_vector( + (acpi_physical_address) virt_to_phys( + (void *)acpi_wakeup_address)); + } + ACPI_FLUSH_CPU_CACHE(); + acpi_enable_wakeup_device_prep(acpi_state); + acpi_enter_sleep_state_prep(acpi_state); + return 0; +} + + +/** + * 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); + else + do_suspend_lowlevel_s4bios(); + break; + default: + return -EINVAL; + } + 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, + }; + + if (acpi_state <= 4 && states[acpi_state]) + return pm_suspend(states[acpi_state]); + return -EINVAL; +} + +static struct pm_ops acpi_pm_ops = { + .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"), }, + }, + { }, +}; + +static 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 (acpi_gbl_FACS->S4bios_f) { + sleep_states[i] = 1; + printk(" S4bios"); + acpi_pm_ops.pm_disk_mode = PM_DISK_FIRMWARE; + } + if (sleep_states[i]) + acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM; + } + } + printk(")\n"); + + pm_set_ops(&acpi_pm_ops); + return 0; +} + +late_initcall(acpi_sleep_init); |