// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
 *
 * Copyright (C) 2000 - 2021, Intel Corp.
 *
 *****************************************************************************/

#define EXPORT_ACPI_INTERFACES

#include <acpi/acpi.h>
#include "accommon.h"

#define _COMPONENT          ACPI_HARDWARE
ACPI_MODULE_NAME("hwxfsleep")

/* Local prototypes */
#if (!ACPI_REDUCED_HARDWARE)
static acpi_status
acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
                                   acpi_physical_address physical_address,
                                   acpi_physical_address physical_address64);
#endif

/*
 * These functions are removed for the ACPI_REDUCED_HARDWARE case:
 *      acpi_set_firmware_waking_vector
 *      acpi_enter_sleep_state_s4bios
 */

#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
 *
 * FUNCTION:    acpi_hw_set_firmware_waking_vector
 *
 * PARAMETERS:  facs                - Pointer to FACS table
 *              physical_address    - 32-bit physical address of ACPI real mode
 *                                    entry point
 *              physical_address64  - 64-bit physical address of ACPI protected
 *                                    mode entry point
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 *
 ******************************************************************************/

static acpi_status
acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
                                   acpi_physical_address physical_address,
                                   acpi_physical_address physical_address64)
{
        ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);


        /*
         * According to the ACPI specification 2.0c and later, the 64-bit
         * waking vector should be cleared and the 32-bit waking vector should
         * be used, unless we want the wake-up code to be called by the BIOS in
         * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
         * to fail to resume if the 64-bit vector is used.
         */

        /* Set the 32-bit vector */

        facs->firmware_waking_vector = (u32)physical_address;

        if (facs->length > 32) {
                if (facs->version >= 1) {

                        /* Set the 64-bit vector */

                        facs->xfirmware_waking_vector = physical_address64;
                } else {
                        /* Clear the 64-bit vector if it exists */

                        facs->xfirmware_waking_vector = 0;
                }
        }

        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_set_firmware_waking_vector
 *
 * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
 *                                    entry point
 *              physical_address64  - 64-bit physical address of ACPI protected
 *                                    mode entry point
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 *
 ******************************************************************************/

acpi_status
acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
                                acpi_physical_address physical_address64)
{

        ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);

        if (acpi_gbl_FACS) {
                (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS,
                                                         physical_address,
                                                         physical_address64);
        }

        return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)

/*******************************************************************************
 *
 * FUNCTION:    acpi_enter_sleep_state_s4bios
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform a S4 bios request.
 *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 *
 ******************************************************************************/
acpi_status acpi_enter_sleep_state_s4bios(void)
{
        u32 in_value;
        acpi_status status;

        ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);

        /* Clear the wake status bit (PM1) */

        status =
            acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        status = acpi_hw_clear_acpi_status();
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /*
         * 1) Disable 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);
        }

        ACPI_FLUSH_CPU_CACHE();

        status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
                                    (u32)acpi_gbl_FADT.s4_bios_request, 8);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        do {
                acpi_os_stall(ACPI_USEC_PER_MSEC);
                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);
}

ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
#endif                          /* !ACPI_REDUCED_HARDWARE */

/*******************************************************************************
 *
 * FUNCTION:    acpi_enter_sleep_state_prep
 *
 * PARAMETERS:  sleep_state         - Which sleep state to enter
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Prepare to enter a system sleep state.
 *              This function must execute with interrupts enabled.
 *              We break sleeping into 2 stages so that OSPM can handle
 *              various OS-specific tasks between the two steps.
 *
 ******************************************************************************/

acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
{
        acpi_status status;
        struct acpi_object_list arg_list;
        union acpi_object arg;
        u32 sst_value;

        ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);

        status = acpi_get_sleep_type_data(sleep_state,
                                          &acpi_gbl_sleep_type_a,
                                          &acpi_gbl_sleep_type_b);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /* Execute the _PTS method (Prepare To Sleep) */

        arg_list.count = 1;
        arg_list.pointer = &arg;
        arg.type = ACPI_TYPE_INTEGER;
        arg.integer.value = sleep_state;

        status =
            acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
                return_ACPI_STATUS(status);
        }

        /* Setup the argument to the _SST method (System STatus) */

        switch (sleep_state) {
        case ACPI_STATE_S0:

                sst_value = ACPI_SST_WORKING;
                break;

        case ACPI_STATE_S1:
        case ACPI_STATE_S2:
        case ACPI_STATE_S3:

                sst_value = ACPI_SST_SLEEPING;
                break;

        case ACPI_STATE_S4:

                sst_value = ACPI_SST_SLEEP_CONTEXT;
                break;

        default:

                sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
                break;
        }

        /*
         * Set the system indicators to show the desired sleep state.
         * _SST is an optional method (return no error if not found)
         */
        acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
        return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)

/*******************************************************************************
 *
 * FUNCTION:    acpi_enter_sleep_state
 *
 * PARAMETERS:  sleep_state         - Which sleep state to enter
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enter a system sleep state
 *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 *
 ******************************************************************************/
acpi_status acpi_enter_sleep_state(u8 sleep_state)
{
        acpi_status status;

        ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);

        if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
            (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
                ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
                            acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
                return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
        }

#if !ACPI_REDUCED_HARDWARE
        if (!acpi_gbl_reduced_hardware)
                status = acpi_hw_legacy_sleep(sleep_state);
        else
#endif
                status = acpi_hw_extended_sleep(sleep_state);
        return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)

/*******************************************************************************
 *
 * FUNCTION:    acpi_leave_sleep_state_prep
 *
 * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 *              sleep. Called with interrupts DISABLED.
 *              We break wake/resume into 2 stages so that OSPM can handle
 *              various OS-specific tasks between the two steps.
 *
 ******************************************************************************/
acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
{
        acpi_status status;

        ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);

#if !ACPI_REDUCED_HARDWARE
        if (!acpi_gbl_reduced_hardware)
                status = acpi_hw_legacy_wake_prep(sleep_state);
        else
#endif
                status = acpi_hw_extended_wake_prep(sleep_state);
        return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)

/*******************************************************************************
 *
 * FUNCTION:    acpi_leave_sleep_state
 *
 * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 *              Called with interrupts ENABLED.
 *
 ******************************************************************************/
acpi_status acpi_leave_sleep_state(u8 sleep_state)
{
        acpi_status status;

        ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);

#if !ACPI_REDUCED_HARDWARE
        if (!acpi_gbl_reduced_hardware)
                status = acpi_hw_legacy_wake(sleep_state);
        else
#endif
                status = acpi_hw_extended_wake(sleep_state);
        return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)