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/******************************************************************************

 *

 * Module Name: hwgpe - Low level GPE enable/disable/clear functions

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2007, R. Byron Moore

 * 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 <acpi/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);

/******************************************************************************

 *

 * 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_hw_low_level_write(8, 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_hw_low_level_write(8, 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.

 *

 ******************************************************************************/

#ifdef ACPI_FUTURE_USAGE

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_hw_low_level_read(8, &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);

}

#endif                          /*  ACPI_FUTURE_USAGE  */

/******************************************************************************

 *

 * 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)

{

        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_low_level_write(8, 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)

{

        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_low_level_write(8, 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)

{

        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_low_level_write(8,

                                            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)

{

        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_low_level_write(8,

                                                 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);

        status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);

        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);

        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);

        return_ACPI_STATUS(status);

}