/****************************************************************************** * * Module Name: hwgpe - Low level GPE enable/disable/clear functions * *****************************************************************************/ /* * Copyright (C) 2000 - 2012, 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_get_gpe_register_bit * * PARAMETERS: gpe_event_info - Info block for the GPE * gpe_register_info - Info block for the GPE register * * RETURN: Register mask with a one in the GPE bit position * * DESCRIPTION: Compute the register mask for this GPE. One bit is set in the * correct position for the input GPE. * ******************************************************************************/ u32 acpi_hw_get_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info, struct acpi_gpe_register_info *gpe_register_info) { return (u32)1 << (gpe_event_info->gpe_number - gpe_register_info->base_gpe_number); } /****************************************************************************** * * FUNCTION: acpi_hw_low_set_gpe * * PARAMETERS: gpe_event_info - Info block for the GPE to be disabled * action - Enable or disable * * RETURN: Status * * DESCRIPTION: Enable or disable a single GPE in the parent enable register. * ******************************************************************************/ acpi_status acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u32 action) { struct acpi_gpe_register_info *gpe_register_info; acpi_status status; u32 enable_mask; u32 register_bit; 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); } /* Get current value of the enable register that contains this GPE */ status = acpi_hw_read(&enable_mask, &gpe_register_info->enable_address); if (ACPI_FAILURE(status)) { return (status); } /* Set or clear just the bit that corresponds to this GPE */ register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info); switch (action) { case ACPI_GPE_CONDITIONAL_ENABLE: /* Only enable if the enable_for_run bit is set */ if (!(register_bit & gpe_register_info->enable_for_run)) { return (AE_BAD_PARAMETER); } /*lint -fallthrough */ case ACPI_GPE_ENABLE: ACPI_SET_BIT(enable_mask, register_bit); break; case ACPI_GPE_DISABLE: ACPI_CLEAR_BIT(enable_mask, register_bit); break; default: ACPI_ERROR((AE_INFO, "Invalid GPE Action, %u\n", action)); return (AE_BAD_PARAMETER); } /* Write the updated enable mask */ status = acpi_hw_write(enable_mask, &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) { struct acpi_gpe_register_info *gpe_register_info; acpi_status status; u32 register_bit; 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 a one to the appropriate bit in the status register to * clear this GPE. */ register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info); status = acpi_hw_write(register_bit, &gpe_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; u32 register_bit; struct acpi_gpe_register_info *gpe_register_info; acpi_event_status local_event_status = 0; acpi_status status; 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 = acpi_hw_get_gpe_register_bit(gpe_event_info, gpe_register_info); /* 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_hw_read(&in_byte, &gpe_register_info->status_address); if (ACPI_FAILURE(status)) { return (status); } if (register_bit & in_byte) { local_event_status |= ACPI_EVENT_FLAG_SET; } /* Set return value */ (*event_status) = local_event_status; return (AE_OK); } /****************************************************************************** * * 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_hw_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_hw_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_hw_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_hw_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); }