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

 *

 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface

 *

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

/*

 * Copyright (C) 2000 - 2004, 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>

#define _COMPONENT          ACPI_HARDWARE

         ACPI_MODULE_NAME    ("hwacpi")

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

 *

 * FUNCTION:    acpi_hw_initialize

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Initialize and validate various ACPI registers

 *

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

acpi_status

acpi_hw_initialize (

        void)

{

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("hw_initialize");

        /* We must have the ACPI tables by the time we get here */

        if (!acpi_gbl_FADT) {

                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "A FADT is not loaded\n"));

                return_ACPI_STATUS (AE_NO_ACPI_TABLES);

        }

        /* Sanity check the FADT for valid values */

        status = acpi_ut_validate_fadt ();

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        return_ACPI_STATUS (AE_OK);

}

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

 *

 * FUNCTION:    acpi_hw_set_mode

 *

 * PARAMETERS:  Mode            - SYS_MODE_ACPI or SYS_MODE_LEGACY

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Transitions the system into the requested mode.

 *

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

acpi_status

acpi_hw_set_mode (

        u32                             mode)

{

        acpi_status                     status;

        u32                             retry;

        ACPI_FUNCTION_TRACE ("hw_set_mode");

        /*

         * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,

         * system does not support mode transition.

         */

        if (!acpi_gbl_FADT->smi_cmd) {

                ACPI_REPORT_ERROR (("No SMI_CMD in FADT, mode transition failed.\n"));

                return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);

        }

        /*

         * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE

         * in FADT: If it is zero, enabling or disabling is not supported.

         * As old systems may have used zero for mode transition,

         * we make sure both the numbers are zero to determine these

         * transitions are not supported.

         */

        if (!acpi_gbl_FADT->acpi_enable && !acpi_gbl_FADT->acpi_disable) {

                ACPI_REPORT_ERROR (("No ACPI mode transition supported in this system (enable/disable both zero)\n"));

                return_ACPI_STATUS (AE_OK);

        }

        switch (mode) {

        case ACPI_SYS_MODE_ACPI:

                /* BIOS should have disabled ALL fixed and GP events */

                status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd,

                                  (u32) acpi_gbl_FADT->acpi_enable, 8);

                ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));

                break;

        case ACPI_SYS_MODE_LEGACY:

                /*

                 * BIOS should clear all fixed status bits and restore fixed event

                 * enable bits to default

                 */

                status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd,

                                 (u32) acpi_gbl_FADT->acpi_disable, 8);

                ACPI_DEBUG_PRINT ((ACPI_DB_INFO,

                                 "Attempting to enable Legacy (non-ACPI) mode\n"));

                break;

        default:

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        if (ACPI_FAILURE (status)) {

                ACPI_REPORT_ERROR (("Could not write mode change, %s\n", acpi_format_exception (status)));

                return_ACPI_STATUS (status);

        }

        /*

         * Some hardware takes a LONG time to switch modes. Give them 3 sec to

         * do so, but allow faster systems to proceed more quickly.

         */

        retry = 3000;

        while (retry) {

                if (acpi_hw_get_mode() == mode) {

                        ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", mode));

                        return_ACPI_STATUS (AE_OK);

                }

                acpi_os_stall(1000);

                retry--;

        }

        ACPI_REPORT_ERROR (("Hardware never changed modes\n"));

        return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);

}

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

 *

 * FUNCTION:    acpi_hw_get_mode

 *

 * PARAMETERS:  none

 *

 * RETURN:      SYS_MODE_ACPI or SYS_MODE_LEGACY

 *

 * DESCRIPTION: Return current operating state of system.  Determined by

 *              querying the SCI_EN bit.

 *

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

u32

acpi_hw_get_mode (void)

{

        acpi_status                     status;

        u32                             value;

        ACPI_FUNCTION_TRACE ("hw_get_mode");

        /* If there's no smi_cmd port, then it's ACPI only hw */

        if (!acpi_gbl_FADT->smi_cmd)

                return_VALUE (ACPI_SYS_MODE_ACPI);

        /*

         * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,

         * system does not support mode transition.

         */

        if (!acpi_gbl_FADT->smi_cmd) {

                return_VALUE (ACPI_SYS_MODE_ACPI);

        }

        status = acpi_get_register (ACPI_BITREG_SCI_ENABLE, &value, ACPI_MTX_LOCK);

        if (ACPI_FAILURE (status)) {

                return_VALUE (ACPI_SYS_MODE_LEGACY);

        }

        if (value) {

                return_VALUE (ACPI_SYS_MODE_ACPI);

        }

        else {

                return_VALUE (ACPI_SYS_MODE_LEGACY);

        }

}