dist/hardware/hwxface.c

/******************************************************************************
 *
 * Module Name: hwxface - Public ACPICA hardware interfaces
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2021, 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 MERCHANTABILITY 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.
 */

#define EXPORT_ACPI_INTERFACES

#include "acpi.h"
#include "accommon.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_HARDWARE
        ACPI_MODULE_NAME    ("hwxface")


/******************************************************************************
 *
 * FUNCTION:    AcpiReset
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Set reset register in memory or IO space. Note: Does not
 *              support reset register in PCI config space, this must be
 *              handled separately.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiReset (
    void)
{
    ACPI_GENERIC_ADDRESS    *ResetReg;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (AcpiReset);


    ResetReg = &AcpiGbl_FADT.ResetRegister;

    /* Check if the reset register is supported */

    if (!(AcpiGbl_FADT.Flags & ACPI_FADT_RESET_REGISTER) ||
        !ResetReg->Address)
    {
        return_ACPI_STATUS (AE_NOT_EXIST);
    }

    if (ResetReg->SpaceId == ACPI_ADR_SPACE_SYSTEM_IO)
    {
        /*
         * For I/O space, write directly to the OSL. This bypasses the port
         * validation mechanism, which may block a valid write to the reset
         * register.
         *
         * NOTE:
         * The ACPI spec requires the reset register width to be 8, so we
         * hardcode it here and ignore the FADT value. This maintains
         * compatibility with other ACPI implementations that have allowed
         * BIOS code with bad register width values to go unnoticed.
         */
        Status = AcpiOsWritePort ((ACPI_IO_ADDRESS) ResetReg->Address,
            AcpiGbl_FADT.ResetValue, ACPI_RESET_REGISTER_WIDTH);
    }
    else
    {
        /* Write the reset value to the reset register */

        Status = AcpiHwWrite (AcpiGbl_FADT.ResetValue, ResetReg);
    }

    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiReset)


/******************************************************************************
 *
 * FUNCTION:    AcpiRead
 *
 * PARAMETERS:  Value               - Where the value is returned
 *              Reg                 - GAS register structure
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Read from either memory or IO space.
 *
 * LIMITATIONS: <These limitations also apply to AcpiWrite>
 *      BitWidth must be exactly 8, 16, 32, or 64.
 *      SpaceID must be SystemMemory or SystemIO.
 *      BitOffset and AccessWidth are currently ignored, as there has
 *          not been a need to implement these.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiRead (
    UINT64                  *ReturnValue,
    ACPI_GENERIC_ADDRESS    *Reg)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (AcpiRead);


    Status = AcpiHwRead (ReturnValue, Reg);
    return (Status);
}

ACPI_EXPORT_SYMBOL (AcpiRead)


/******************************************************************************
 *
 * FUNCTION:    AcpiWrite
 *
 * PARAMETERS:  Value               - Value to be written
 *              Reg                 - GAS register structure
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Write to either memory or IO space.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiWrite (
    UINT64                  Value,
    ACPI_GENERIC_ADDRESS    *Reg)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (AcpiWrite);


    Status = AcpiHwWrite (Value, Reg);
    return (Status);
}

ACPI_EXPORT_SYMBOL (AcpiWrite)


#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
 *
 * FUNCTION:    AcpiReadBitRegister
 *
 * PARAMETERS:  RegisterId      - ID of ACPI Bit Register to access
 *              ReturnValue     - Value that was read from the register,
 *                                normalized to bit position zero.
 *
 * RETURN:      Status and the value read from the specified Register. Value
 *              returned is normalized to bit0 (is shifted all the way right)
 *
 * DESCRIPTION: ACPI BitRegister read function. Does not acquire the HW lock.
 *
 * SUPPORTS:    Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
 *              PM2 Control.
 *
 * Note: The hardware lock is not required when reading the ACPI bit registers
 *       since almost all of them are single bit and it does not matter that
 *       the parent hardware register can be split across two physical
 *       registers. The only multi-bit field is SLP_TYP in the PM1 control
 *       register, but this field does not cross an 8-bit boundary (nor does
 *       it make much sense to actually read this field.)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiReadBitRegister (
    UINT32                  RegisterId,
    UINT32                  *ReturnValue)
{
    ACPI_BIT_REGISTER_INFO  *BitRegInfo;
    UINT32                  RegisterValue;
    UINT32                  Value;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE_U32 (AcpiReadBitRegister, RegisterId);


    /* Get the info structure corresponding to the requested ACPI Register */

    BitRegInfo = AcpiHwGetBitRegisterInfo (RegisterId);
    if (!BitRegInfo)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Read the entire parent register */

    Status = AcpiHwRegisterRead (BitRegInfo->ParentRegister,
        &RegisterValue);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Normalize the value that was read, mask off other bits */

    Value = ((RegisterValue & BitRegInfo->AccessBitMask)
        >> BitRegInfo->BitPosition);

    ACPI_DEBUG_PRINT ((ACPI_DB_IO,
        "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
        RegisterId, BitRegInfo->ParentRegister, RegisterValue, Value));

    *ReturnValue = Value;
    return_ACPI_STATUS (AE_OK);
}

ACPI_EXPORT_SYMBOL (AcpiReadBitRegister)


/*******************************************************************************
 *
 * FUNCTION:    AcpiWriteBitRegister
 *
 * PARAMETERS:  RegisterId      - ID of ACPI Bit Register to access
 *              Value           - Value to write to the register, in bit
 *                                position zero. The bit is automatically
 *                                shifted to the correct position.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
 *              since most operations require a read/modify/write sequence.
 *
 * SUPPORTS:    Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
 *              PM2 Control.
 *
 * Note that at this level, the fact that there may be actually two
 * hardware registers (A and B - and B may not exist) is abstracted.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiWriteBitRegister (
    UINT32                  RegisterId,
    UINT32                  Value)
{
    ACPI_BIT_REGISTER_INFO  *BitRegInfo;
    ACPI_CPU_FLAGS          LockFlags;
    UINT32                  RegisterValue;
    ACPI_STATUS             Status = AE_OK;


    ACPI_FUNCTION_TRACE_U32 (AcpiWriteBitRegister, RegisterId);


    /* Get the info structure corresponding to the requested ACPI Register */

    BitRegInfo = AcpiHwGetBitRegisterInfo (RegisterId);
    if (!BitRegInfo)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    LockFlags = AcpiOsAcquireLock (AcpiGbl_HardwareLock);

    /*
     * At this point, we know that the parent register is one of the
     * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
     */
    if (BitRegInfo->ParentRegister != ACPI_REGISTER_PM1_STATUS)
    {
        /*
         * 1) Case for PM1 Enable, PM1 Control, and PM2 Control
         *
         * Perform a register read to preserve the bits that we are not
         * interested in
         */
        Status = AcpiHwRegisterRead (BitRegInfo->ParentRegister,
            &RegisterValue);
        if (ACPI_FAILURE (Status))
        {
            goto UnlockAndExit;
        }

        /*
         * Insert the input bit into the value that was just read
         * and write the register
         */
        ACPI_REGISTER_INSERT_VALUE (RegisterValue, BitRegInfo->BitPosition,
            BitRegInfo->AccessBitMask, Value);

        Status = AcpiHwRegisterWrite (BitRegInfo->ParentRegister,
            RegisterValue);
    }
    else
    {
        /*
         * 2) Case for PM1 Status
         *
         * The Status register is different from the rest. Clear an event
         * by writing 1, writing 0 has no effect. So, the only relevant
         * information is the single bit we're interested in, all others
         * should be written as 0 so they will be left unchanged.
         */
        RegisterValue = ACPI_REGISTER_PREPARE_BITS (Value,
            BitRegInfo->BitPosition, BitRegInfo->AccessBitMask);

        /* No need to write the register if value is all zeros */

        if (RegisterValue)
        {
            Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_STATUS,
                RegisterValue);
        }
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_IO,
        "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
        RegisterId, BitRegInfo->ParentRegister, Value, RegisterValue));


UnlockAndExit:

    AcpiOsReleaseLock (AcpiGbl_HardwareLock, LockFlags);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiWriteBitRegister)

#endif /* !ACPI_REDUCED_HARDWARE */


/*******************************************************************************
 *
 * FUNCTION:    AcpiGetSleepTypeData
 *
 * PARAMETERS:  SleepState          - Numeric sleep state
 *              *SleepTypeA         - Where SLP_TYPa is returned
 *              *SleepTypeB         - Where SLP_TYPb is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested
 *              sleep state via the appropriate \_Sx object.
 *
 *  The sleep state package returned from the corresponding \_Sx_ object
 *  must contain at least one integer.
 *
 *  March 2005:
 *  Added support for a package that contains two integers. This
 *  goes against the ACPI specification which defines this object as a
 *  package with one encoded DWORD integer. However, existing practice
 *  by many BIOS vendors is to return a package with 2 or more integer
 *  elements, at least one per sleep type (A/B).
 *
 *  January 2013:
 *  Therefore, we must be prepared to accept a package with either a
 *  single integer or multiple integers.
 *
 *  The single integer DWORD format is as follows:
 *      BYTE 0 - Value for the PM1A SLP_TYP register
 *      BYTE 1 - Value for the PM1B SLP_TYP register
 *      BYTE 2-3 - Reserved
 *
 *  The dual integer format is as follows:
 *      Integer 0 - Value for the PM1A SLP_TYP register
 *      Integer 1 - Value for the PM1A SLP_TYP register
 *
 ******************************************************************************/

ACPI_STATUS
AcpiGetSleepTypeData (
    UINT8                   SleepState,
    UINT8                   *SleepTypeA,
    UINT8                   *SleepTypeB)
{
    ACPI_STATUS             Status;
    ACPI_EVALUATE_INFO      *Info;
    ACPI_OPERAND_OBJECT     **Elements;


    ACPI_FUNCTION_TRACE (AcpiGetSleepTypeData);


    /* Validate parameters */

    if ((SleepState > ACPI_S_STATES_MAX) ||
        !SleepTypeA || !SleepTypeB)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Allocate the evaluation information block */

    Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
    if (!Info)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /*
     * Evaluate the \_Sx namespace object containing the register values
     * for this state
     */
    Info->RelativePathname = AcpiGbl_SleepStateNames[SleepState];

    Status = AcpiNsEvaluate (Info);
    if (ACPI_FAILURE (Status))
    {
        if (Status == AE_NOT_FOUND)
        {
            /* The _Sx states are optional, ignore NOT_FOUND */

            goto FinalCleanup;
        }

        goto WarningCleanup;
    }

    /* Must have a return object */

    if (!Info->ReturnObject)
    {
        ACPI_ERROR ((AE_INFO, "No Sleep State object returned from [%s]",
            Info->RelativePathname));
        Status = AE_AML_NO_RETURN_VALUE;
        goto WarningCleanup;
    }

    /* Return object must be of type Package */

    if (Info->ReturnObject->Common.Type != ACPI_TYPE_PACKAGE)
    {
        ACPI_ERROR ((AE_INFO, "Sleep State return object is not a Package"));
        Status = AE_AML_OPERAND_TYPE;
        goto ReturnValueCleanup;
    }

    /*
     * Any warnings about the package length or the object types have
     * already been issued by the predefined name module -- there is no
     * need to repeat them here.
     */
    Elements = Info->ReturnObject->Package.Elements;
    switch (Info->ReturnObject->Package.Count)
    {
    case 0:

        Status = AE_AML_PACKAGE_LIMIT;
        break;

    case 1:

        if (Elements[0]->Common.Type != ACPI_TYPE_INTEGER)
        {
            Status = AE_AML_OPERAND_TYPE;
            break;
        }

        /* A valid _Sx_ package with one integer */

        *SleepTypeA = (UINT8) Elements[0]->Integer.Value;
        *SleepTypeB = (UINT8) (Elements[0]->Integer.Value >> 8);
        break;

    case 2:
    default:

        if ((Elements[0]->Common.Type != ACPI_TYPE_INTEGER) ||
            (Elements[1]->Common.Type != ACPI_TYPE_INTEGER))
        {
            Status = AE_AML_OPERAND_TYPE;
            break;
        }

        /* A valid _Sx_ package with two integers */

        *SleepTypeA = (UINT8) Elements[0]->Integer.Value;
        *SleepTypeB = (UINT8) Elements[1]->Integer.Value;
        break;
    }

ReturnValueCleanup:
    AcpiUtRemoveReference (Info->ReturnObject);

WarningCleanup:
    if (ACPI_FAILURE (Status))
    {
        ACPI_EXCEPTION ((AE_INFO, Status,
            "While evaluating Sleep State [%s]",
            Info->RelativePathname));
    }

FinalCleanup:
    ACPI_FREE (Info);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiGetSleepTypeData)