diff options
Diffstat (limited to 'drivers/acpi/acpica/hwgpe.c')
| -rw-r--r-- | drivers/acpi/acpica/hwgpe.c | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c new file mode 100644 index 000000000000..2013b66745d2 --- /dev/null +++ b/drivers/acpi/acpica/hwgpe.c @@ -0,0 +1,469 @@ + +/****************************************************************************** + * + * Module Name: hwgpe - Low level GPE enable/disable/clear functions + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2008, 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 "accommon.h" +#include "acevents.h" + +#define _COMPONENT ACPI_HARDWARE +ACPI_MODULE_NAME("hwgpe") + +/* Local prototypes */ +static acpi_status +acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, + void *context); + +/****************************************************************************** + * + * FUNCTION: acpi_hw_low_disable_gpe + * + * PARAMETERS: gpe_event_info - Info block for the GPE to be disabled + * + * RETURN: Status + * + * DESCRIPTION: Disable a single GPE in the enable register. + * + ******************************************************************************/ + +acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info) +{ + struct acpi_gpe_register_info *gpe_register_info; + acpi_status status; + u32 enable_mask; + + /* Get the info block for the entire GPE register */ + + gpe_register_info = gpe_event_info->register_info; + if (!gpe_register_info) { + return (AE_NOT_EXIST); + } + + /* Get current value of the enable register that contains this GPE */ + + status = acpi_read(&enable_mask, &gpe_register_info->enable_address); + if (ACPI_FAILURE(status)) { + return (status); + } + + /* Clear just the bit that corresponds to this GPE */ + + ACPI_CLEAR_BIT(enable_mask, + ((u32) 1 << + (gpe_event_info->gpe_number - + gpe_register_info->base_gpe_number))); + + /* Write the updated enable mask */ + + status = acpi_write(enable_mask, &gpe_register_info->enable_address); + return (status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_write_gpe_enable_reg + * + * PARAMETERS: gpe_event_info - Info block for the GPE to be enabled + * + * RETURN: Status + * + * DESCRIPTION: Write a GPE enable register. Note: The bit for this GPE must + * already be cleared or set in the parent register + * enable_for_run mask. + * + ******************************************************************************/ + +acpi_status +acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info * gpe_event_info) +{ + struct acpi_gpe_register_info *gpe_register_info; + acpi_status status; + + ACPI_FUNCTION_ENTRY(); + + /* Get the info block for the entire GPE register */ + + gpe_register_info = gpe_event_info->register_info; + if (!gpe_register_info) { + return (AE_NOT_EXIST); + } + + /* Write the entire GPE (runtime) enable register */ + + status = acpi_write(gpe_register_info->enable_for_run, + &gpe_register_info->enable_address); + + return (status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_clear_gpe + * + * PARAMETERS: gpe_event_info - Info block for the GPE to be cleared + * + * RETURN: Status + * + * DESCRIPTION: Clear the status bit for a single GPE. + * + ******************************************************************************/ + +acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info) +{ + acpi_status status; + u8 register_bit; + + ACPI_FUNCTION_ENTRY(); + + register_bit = (u8) + (1 << + (gpe_event_info->gpe_number - + gpe_event_info->register_info->base_gpe_number)); + + /* + * Write a one to the appropriate bit in the status register to + * clear this GPE. + */ + status = acpi_write(register_bit, + &gpe_event_info->register_info->status_address); + + return (status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_get_gpe_status + * + * PARAMETERS: gpe_event_info - Info block for the GPE to queried + * event_status - Where the GPE status is returned + * + * RETURN: Status + * + * DESCRIPTION: Return the status of a single GPE. + * + ******************************************************************************/ + +acpi_status +acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info, + acpi_event_status * event_status) +{ + u32 in_byte; + u8 register_bit; + struct acpi_gpe_register_info *gpe_register_info; + acpi_status status; + acpi_event_status local_event_status = 0; + + ACPI_FUNCTION_ENTRY(); + + if (!event_status) { + return (AE_BAD_PARAMETER); + } + + /* Get the info block for the entire GPE register */ + + gpe_register_info = gpe_event_info->register_info; + + /* Get the register bitmask for this GPE */ + + register_bit = (u8) + (1 << + (gpe_event_info->gpe_number - + gpe_event_info->register_info->base_gpe_number)); + + /* GPE currently enabled? (enabled for runtime?) */ + + if (register_bit & gpe_register_info->enable_for_run) { + local_event_status |= ACPI_EVENT_FLAG_ENABLED; + } + + /* GPE enabled for wake? */ + + if (register_bit & gpe_register_info->enable_for_wake) { + local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED; + } + + /* GPE currently active (status bit == 1)? */ + + status = acpi_read(&in_byte, &gpe_register_info->status_address); + if (ACPI_FAILURE(status)) { + goto unlock_and_exit; + } + + if (register_bit & in_byte) { + local_event_status |= ACPI_EVENT_FLAG_SET; + } + + /* Set return value */ + + (*event_status) = local_event_status; + + unlock_and_exit: + return (status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_disable_gpe_block + * + * PARAMETERS: gpe_xrupt_info - GPE Interrupt info + * gpe_block - Gpe Block info + * + * RETURN: Status + * + * DESCRIPTION: Disable all GPEs within a single GPE block + * + ******************************************************************************/ + +acpi_status +acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, void *context) +{ + u32 i; + acpi_status status; + + /* Examine each GPE Register within the block */ + + for (i = 0; i < gpe_block->register_count; i++) { + + /* Disable all GPEs in this register */ + + status = + acpi_write(0x00, + &gpe_block->register_info[i].enable_address); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_clear_gpe_block + * + * PARAMETERS: gpe_xrupt_info - GPE Interrupt info + * gpe_block - Gpe Block info + * + * RETURN: Status + * + * DESCRIPTION: Clear status bits for all GPEs within a single GPE block + * + ******************************************************************************/ + +acpi_status +acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, void *context) +{ + u32 i; + acpi_status status; + + /* Examine each GPE Register within the block */ + + for (i = 0; i < gpe_block->register_count; i++) { + + /* Clear status on all GPEs in this register */ + + status = + acpi_write(0xFF, + &gpe_block->register_info[i].status_address); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_enable_runtime_gpe_block + * + * PARAMETERS: gpe_xrupt_info - GPE Interrupt info + * gpe_block - Gpe Block info + * + * RETURN: Status + * + * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes + * combination wake/run GPEs. + * + ******************************************************************************/ + +acpi_status +acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, void *context) +{ + u32 i; + acpi_status status; + + /* NOTE: assumes that all GPEs are currently disabled */ + + /* Examine each GPE Register within the block */ + + for (i = 0; i < gpe_block->register_count; i++) { + if (!gpe_block->register_info[i].enable_for_run) { + continue; + } + + /* Enable all "runtime" GPEs in this register */ + + status = acpi_write(gpe_block->register_info[i].enable_for_run, + &gpe_block->register_info[i]. + enable_address); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_enable_wakeup_gpe_block + * + * PARAMETERS: gpe_xrupt_info - GPE Interrupt info + * gpe_block - Gpe Block info + * + * RETURN: Status + * + * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes + * combination wake/run GPEs. + * + ******************************************************************************/ + +static acpi_status +acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, + void *context) +{ + u32 i; + acpi_status status; + + /* Examine each GPE Register within the block */ + + for (i = 0; i < gpe_block->register_count; i++) { + if (!gpe_block->register_info[i].enable_for_wake) { + continue; + } + + /* Enable all "wake" GPEs in this register */ + + status = acpi_write(gpe_block->register_info[i].enable_for_wake, + &gpe_block->register_info[i]. + enable_address); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_disable_all_gpes + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Disable and clear all GPEs in all GPE blocks + * + ******************************************************************************/ + +acpi_status acpi_hw_disable_all_gpes(void) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_disable_all_gpes); + + status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL); + status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL); + return_ACPI_STATUS(status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_enable_all_runtime_gpes + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks + * + ******************************************************************************/ + +acpi_status acpi_hw_enable_all_runtime_gpes(void) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes); + + status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block, NULL); + return_ACPI_STATUS(status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_enable_all_wakeup_gpes + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks + * + ******************************************************************************/ + +acpi_status acpi_hw_enable_all_wakeup_gpes(void) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes); + + status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block, NULL); + return_ACPI_STATUS(status); +} |