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Diffstat (limited to 'drivers/acpi/acpica/hwsleep.c')
| -rw-r--r-- | drivers/acpi/acpica/hwsleep.c | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c new file mode 100644 index 000000000..7d21cae6d --- /dev/null +++ b/drivers/acpi/acpica/hwsleep.c @@ -0,0 +1,345 @@ +/****************************************************************************** + * + * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the + * original/legacy sleep/PM registers. + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2015, Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +#include <acpi/acpi.h> +#include <linux/acpi.h> +#include "accommon.h" + +#define _COMPONENT ACPI_HARDWARE +ACPI_MODULE_NAME("hwsleep") + +#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ +/******************************************************************************* + * + * FUNCTION: acpi_hw_legacy_sleep + * + * PARAMETERS: sleep_state - Which sleep state to enter + * + * RETURN: Status + * + * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers + * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED + * + ******************************************************************************/ +acpi_status acpi_hw_legacy_sleep(u8 sleep_state) +{ + struct acpi_bit_register_info *sleep_type_reg_info; + struct acpi_bit_register_info *sleep_enable_reg_info; + u32 pm1a_control; + u32 pm1b_control; + u32 in_value; + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_legacy_sleep); + + sleep_type_reg_info = + acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE); + sleep_enable_reg_info = + acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE); + + /* Clear wake status */ + + status = + acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Clear all fixed and general purpose status bits */ + + status = acpi_hw_clear_acpi_status(); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* + * 1) Disable/Clear all GPEs + * 2) Enable all wakeup GPEs + */ + status = acpi_hw_disable_all_gpes(); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + acpi_gbl_system_awake_and_running = FALSE; + + status = acpi_hw_enable_all_wakeup_gpes(); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Get current value of PM1A control */ + + status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, + &pm1a_control); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + ACPI_DEBUG_PRINT((ACPI_DB_INIT, + "Entering sleep state [S%u]\n", sleep_state)); + + /* Clear the SLP_EN and SLP_TYP fields */ + + pm1a_control &= ~(sleep_type_reg_info->access_bit_mask | + sleep_enable_reg_info->access_bit_mask); + pm1b_control = pm1a_control; + + /* Insert the SLP_TYP bits */ + + pm1a_control |= + (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position); + pm1b_control |= + (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position); + + /* + * We split the writes of SLP_TYP and SLP_EN to workaround + * poorly implemented hardware. + */ + + /* Write #1: write the SLP_TYP data to the PM1 Control registers */ + + status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Insert the sleep enable (SLP_EN) bit */ + + pm1a_control |= sleep_enable_reg_info->access_bit_mask; + pm1b_control |= sleep_enable_reg_info->access_bit_mask; + + /* Flush caches, as per ACPI specification */ + + ACPI_FLUSH_CPU_CACHE(); + + status = acpi_os_prepare_sleep(sleep_state, pm1a_control, + pm1b_control); + if (ACPI_SKIP(status)) + return_ACPI_STATUS(AE_OK); + if (ACPI_FAILURE(status)) + return_ACPI_STATUS(status); + /* Write #2: Write both SLP_TYP + SLP_EN */ + + status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + if (sleep_state > ACPI_STATE_S3) { + /* + * We wanted to sleep > S3, but it didn't happen (by virtue of the + * fact that we are still executing!) + * + * Wait ten seconds, then try again. This is to get S4/S5 to work on + * all machines. + * + * We wait so long to allow chipsets that poll this reg very slowly + * to still read the right value. Ideally, this block would go + * away entirely. + */ + acpi_os_stall(10 * ACPI_USEC_PER_SEC); + + status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL, + sleep_enable_reg_info-> + access_bit_mask); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + } + + /* Wait for transition back to Working State */ + + do { + status = + acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + } while (!in_value); + + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_hw_legacy_wake_prep + * + * PARAMETERS: sleep_state - Which sleep state we just exited + * + * RETURN: Status + * + * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a + * sleep. + * Called with interrupts ENABLED. + * + ******************************************************************************/ + +acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state) +{ + acpi_status status; + struct acpi_bit_register_info *sleep_type_reg_info; + struct acpi_bit_register_info *sleep_enable_reg_info; + u32 pm1a_control; + u32 pm1b_control; + + ACPI_FUNCTION_TRACE(hw_legacy_wake_prep); + + /* + * Set SLP_TYPE and SLP_EN to state S0. + * This is unclear from the ACPI Spec, but it is required + * by some machines. + */ + status = acpi_get_sleep_type_data(ACPI_STATE_S0, + &acpi_gbl_sleep_type_a, + &acpi_gbl_sleep_type_b); + if (ACPI_SUCCESS(status)) { + sleep_type_reg_info = + acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE); + sleep_enable_reg_info = + acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE); + + /* Get current value of PM1A control */ + + status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, + &pm1a_control); + if (ACPI_SUCCESS(status)) { + + /* Clear the SLP_EN and SLP_TYP fields */ + + pm1a_control &= ~(sleep_type_reg_info->access_bit_mask | + sleep_enable_reg_info-> + access_bit_mask); + pm1b_control = pm1a_control; + + /* Insert the SLP_TYP bits */ + + pm1a_control |= (acpi_gbl_sleep_type_a << + sleep_type_reg_info->bit_position); + pm1b_control |= (acpi_gbl_sleep_type_b << + sleep_type_reg_info->bit_position); + + /* Write the control registers and ignore any errors */ + + (void)acpi_hw_write_pm1_control(pm1a_control, + pm1b_control); + } + } + + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_hw_legacy_wake + * + * PARAMETERS: sleep_state - Which sleep state we just exited + * + * RETURN: Status + * + * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep + * Called with interrupts ENABLED. + * + ******************************************************************************/ + +acpi_status acpi_hw_legacy_wake(u8 sleep_state) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_legacy_wake); + + /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */ + + acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID; + acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING); + + /* + * GPEs must be enabled before _WAK is called as GPEs + * might get fired there + * + * Restore the GPEs: + * 1) Disable/Clear all GPEs + * 2) Enable all runtime GPEs + */ + status = acpi_hw_disable_all_gpes(); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + status = acpi_hw_enable_all_runtime_gpes(); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* + * Now we can execute _WAK, etc. Some machines require that the GPEs + * are enabled before the wake methods are executed. + */ + acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state); + + /* + * Some BIOS code assumes that WAK_STS will be cleared on resume + * and use it to determine whether the system is rebooting or + * resuming. Clear WAK_STS for compatibility. + */ + (void)acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, + ACPI_CLEAR_STATUS); + acpi_gbl_system_awake_and_running = TRUE; + + /* Enable power button */ + + (void) + acpi_write_bit_register(acpi_gbl_fixed_event_info + [ACPI_EVENT_POWER_BUTTON]. + enable_register_id, ACPI_ENABLE_EVENT); + + (void) + acpi_write_bit_register(acpi_gbl_fixed_event_info + [ACPI_EVENT_POWER_BUTTON]. + status_register_id, ACPI_CLEAR_STATUS); + + acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING); + return_ACPI_STATUS(status); +} + +#endif /* !ACPI_REDUCED_HARDWARE */ |