evgpeblk.c

acpi tools for linux include acpiexec and acpixtract

    GpeEventInfo = ACPI_ALLOCATE_ZEROED (
                        ((ACPI_SIZE) GpeBlock->RegisterCount *
                        ACPI_GPE_REGISTER_WIDTH) *
                        sizeof (ACPI_GPE_EVENT_INFO));
    if (!GpeEventInfo)
    {
        ACPI_ERROR ((AE_INFO,
            "Could not allocate the GpeEventInfo table"));
        Status = AE_NO_MEMORY;
        goto ErrorExit;
    }

    /* Save the new Info arrays in the GPE block */

    GpeBlock->RegisterInfo = GpeRegisterInfo;
    GpeBlock->EventInfo    = GpeEventInfo;

    /*
     * Initialize the GPE Register and Event structures. A goal of these
     * tables is to hide the fact that there are two separate GPE register sets
     * in a given GPE hardware block, the status registers occupy the first half,
     * and the enable registers occupy the second half.
     */
    ThisRegister = GpeRegisterInfo;
    ThisEvent    = GpeEventInfo;

    for (i = 0; i < GpeBlock->RegisterCount; i++)
    {
        /* Init the RegisterInfo for this GPE register (8 GPEs) */

        ThisRegister->BaseGpeNumber = (UINT8) (GpeBlock->BlockBaseNumber +
                                             (i * ACPI_GPE_REGISTER_WIDTH));

        ThisRegister->StatusAddress.Address =
            GpeBlock->BlockAddress.Address + i;

        ThisRegister->EnableAddress.Address =
            GpeBlock->BlockAddress.Address + i + GpeBlock->RegisterCount;

        ThisRegister->StatusAddress.SpaceId   = GpeBlock->BlockAddress.SpaceId;
        ThisRegister->EnableAddress.SpaceId   = GpeBlock->BlockAddress.SpaceId;
        ThisRegister->StatusAddress.BitWidth  = ACPI_GPE_REGISTER_WIDTH;
        ThisRegister->EnableAddress.BitWidth  = ACPI_GPE_REGISTER_WIDTH;
        ThisRegister->StatusAddress.BitOffset = ACPI_GPE_REGISTER_WIDTH;
        ThisRegister->EnableAddress.BitOffset = ACPI_GPE_REGISTER_WIDTH;

        /* Init the EventInfo for each GPE within this register */

        for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
        {
            ThisEvent->GpeNumber = (UINT8) (ThisRegister->BaseGpeNumber + j);
            ThisEvent->RegisterInfo = ThisRegister;
            ThisEvent++;
        }

        /* Disable all GPEs within this register */

        Status = AcpiHwLowLevelWrite (ACPI_GPE_REGISTER_WIDTH, 0x00,
                    &ThisRegister->EnableAddress);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        /* Clear any pending GPE events within this register */

        Status = AcpiHwLowLevelWrite (ACPI_GPE_REGISTER_WIDTH, 0xFF,
                    &ThisRegister->StatusAddress);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        ThisRegister++;
    }

    return_ACPI_STATUS (AE_OK);


ErrorExit:
    if (GpeRegisterInfo)
    {
        ACPI_FREE (GpeRegisterInfo);
    }
    if (GpeEventInfo)
    {
        ACPI_FREE (GpeEventInfo);
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvCreateGpeBlock
 *
 * PARAMETERS:  GpeDevice           - Handle to the parent GPE block
 *              GpeBlockAddress     - Address and SpaceID
 *              RegisterCount       - Number of GPE register pairs in the block
 *              GpeBlockBaseNumber  - Starting GPE number for the block
 *              InterruptNumber     - H/W interrupt for the block
 *              ReturnGpeBlock      - Where the new block descriptor is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
 *              the block are disabled at exit.
 *              Note: Assumes namespace is locked.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvCreateGpeBlock (
    ACPI_NAMESPACE_NODE     *GpeDevice,
    ACPI_GENERIC_ADDRESS    *GpeBlockAddress,
    UINT32                  RegisterCount,
    UINT8                   GpeBlockBaseNumber,
    UINT32                  InterruptNumber,
    ACPI_GPE_BLOCK_INFO     **ReturnGpeBlock)
{
    ACPI_STATUS             Status;
    ACPI_GPE_BLOCK_INFO     *GpeBlock;


    ACPI_FUNCTION_TRACE (EvCreateGpeBlock);


    if (!RegisterCount)
    {
        return_ACPI_STATUS (AE_OK);
    }

    /* Allocate a new GPE block */

    GpeBlock = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_BLOCK_INFO));
    if (!GpeBlock)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /* Initialize the new GPE block */

    GpeBlock->Node = GpeDevice;
    GpeBlock->RegisterCount = RegisterCount;
    GpeBlock->BlockBaseNumber = GpeBlockBaseNumber;

    ACPI_MEMCPY (&GpeBlock->BlockAddress, GpeBlockAddress,
        sizeof (ACPI_GENERIC_ADDRESS));

    /*
     * Create the RegisterInfo and EventInfo sub-structures
     * Note: disables and clears all GPEs in the block
     */
    Status = AcpiEvCreateGpeInfoBlocks (GpeBlock);
    if (ACPI_FAILURE (Status))
    {
        ACPI_FREE (GpeBlock);
        return_ACPI_STATUS (Status);
    }

    /* Install the new block in the global lists */

    Status = AcpiEvInstallGpeBlock (GpeBlock, InterruptNumber);
    if (ACPI_FAILURE (Status))
    {
        ACPI_FREE (GpeBlock);
        return_ACPI_STATUS (Status);
    }

    /* Find all GPE methods (_Lxx, _Exx) for this block */

    Status = AcpiNsWalkNamespace (ACPI_TYPE_METHOD, GpeDevice,
                ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
                AcpiEvSaveMethodInfo, GpeBlock, NULL);

    /* Return the new block */

    if (ReturnGpeBlock)
    {
        (*ReturnGpeBlock) = GpeBlock;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
        "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
        (UINT32) GpeBlock->BlockBaseNumber,
        (UINT32) (GpeBlock->BlockBaseNumber +
                ((GpeBlock->RegisterCount * ACPI_GPE_REGISTER_WIDTH) -1)),
        GpeDevice->Name.Ascii,
        GpeBlock->RegisterCount,
        InterruptNumber));

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvInitializeGpeBlock
 *
 * PARAMETERS:  GpeDevice           - Handle to the parent GPE block
 *              GpeBlock            - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize and enable a GPE block. First find and run any
 *              _PRT methods associated with the block, then enable the
 *              appropriate GPEs.
 *              Note: Assumes namespace is locked.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvInitializeGpeBlock (
    ACPI_NAMESPACE_NODE     *GpeDevice,
    ACPI_GPE_BLOCK_INFO     *GpeBlock)
{
    ACPI_STATUS             Status;
    ACPI_GPE_EVENT_INFO     *GpeEventInfo;
    ACPI_GPE_WALK_INFO      GpeInfo;
    UINT32                  WakeGpeCount;
    UINT32                  GpeEnabledCount;
    ACPI_NATIVE_UINT        i;
    ACPI_NATIVE_UINT        j;


    ACPI_FUNCTION_TRACE (EvInitializeGpeBlock);


    /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */

    if (!GpeBlock)
    {
        return_ACPI_STATUS (AE_OK);
    }

    /*
     * Runtime option: Should wake GPEs be enabled at runtime?  The default
     * is no, they should only be enabled just as the machine goes to sleep.
     */
    if (AcpiGbl_LeaveWakeGpesDisabled)
    {
        /*
         * Differentiate runtime vs wake GPEs, via the _PRW control methods.
         * Each GPE that has one or more _PRWs that reference it is by
         * definition a wake GPE and will not be enabled while the machine
         * is running.
         */
        GpeInfo.GpeBlock = GpeBlock;
        GpeInfo.GpeDevice = GpeDevice;

        Status = AcpiNsWalkNamespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
                    ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
                    AcpiEvMatchPrwAndGpe, &GpeInfo, NULL);
    }

    /*
     * Enable all GPEs in this block that have these attributes:
     * 1) are "runtime" or "run/wake" GPEs, and
     * 2) have a corresponding _Lxx or _Exx method
     *
     * Any other GPEs within this block must be enabled via the AcpiEnableGpe()
     * external interface.
     */
    WakeGpeCount = 0;
    GpeEnabledCount = 0;

    for (i = 0; i < GpeBlock->RegisterCount; i++)
    {
        for (j = 0; j < 8; j++)
        {
            /* Get the info block for this particular GPE */

            GpeEventInfo = &GpeBlock->EventInfo[(i * ACPI_GPE_REGISTER_WIDTH) + j];

            if (((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_METHOD) &&
                 (GpeEventInfo->Flags & ACPI_GPE_TYPE_RUNTIME))
            {
                GpeEnabledCount++;
            }

            if (GpeEventInfo->Flags & ACPI_GPE_TYPE_WAKE)
            {
                WakeGpeCount++;
            }
        }
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
        "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
        WakeGpeCount, GpeEnabledCount));

    /* Enable all valid runtime GPEs found above */

    Status = AcpiHwEnableRuntimeGpeBlock (NULL, GpeBlock);
    if (ACPI_FAILURE (Status))
    {
        ACPI_ERROR ((AE_INFO, "Could not enable GPEs in GpeBlock %p",
            GpeBlock));
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvGpeInitialize
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize the GPE data structures
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvGpeInitialize (
    void)
{
    UINT32                  RegisterCount0 = 0;
    UINT32                  RegisterCount1 = 0;
    UINT32                  GpeNumberMax = 0;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (EvGpeInitialize);


    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * Initialize the GPE Block(s) defined in the FADT
     *
     * Why the GPE register block lengths are divided by 2:  From the ACPI Spec,
     * section "General-Purpose Event Registers", we have:
     *
     * "Each register block contains two registers of equal length
     *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
     *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
     *  The length of the GPE1_STS and GPE1_EN registers is equal to
     *  half the GPE1_LEN. If a generic register block is not supported
     *  then its respective block pointer and block length values in the
     *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
     *  to be the same size."
     */

    /*
     * Determine the maximum GPE number for this machine.
     *
     * Note: both GPE0 and GPE1 are optional, and either can exist without
     * the other.
     *
     * If EITHER the register length OR the block address are zero, then that
     * particular block is not supported.
     */
    if (AcpiGbl_FADT.Gpe0BlockLength &&
        AcpiGbl_FADT.XGpe0Block.Address)
    {
        /* GPE block 0 exists (has both length and address > 0) */

        RegisterCount0 = (UINT16) (AcpiGbl_FADT.Gpe0BlockLength / 2);

        GpeNumberMax = (RegisterCount0 * ACPI_GPE_REGISTER_WIDTH) - 1;

        /* Install GPE Block 0 */

        Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice,
                    &AcpiGbl_FADT.XGpe0Block, RegisterCount0, 0,
                    AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[0]);

        if (ACPI_FAILURE (Status))
        {
            ACPI_EXCEPTION ((AE_INFO, Status,
                "Could not create GPE Block 0"));
        }
    }

    if (AcpiGbl_FADT.Gpe1BlockLength &&
        AcpiGbl_FADT.XGpe1Block.Address)
    {
        /* GPE block 1 exists (has both length and address > 0) */

        RegisterCount1 = (UINT16) (AcpiGbl_FADT.Gpe1BlockLength / 2);

        /* Check for GPE0/GPE1 overlap (if both banks exist) */

        if ((RegisterCount0) &&
            (GpeNumberMax >= AcpiGbl_FADT.Gpe1Base))
        {
            ACPI_ERROR ((AE_INFO,
                "GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1",
                GpeNumberMax, AcpiGbl_FADT.Gpe1Base,
                AcpiGbl_FADT.Gpe1Base +
                ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1)));

            /* Ignore GPE1 block by setting the register count to zero */

            RegisterCount1 = 0;
        }
        else
        {
            /* Install GPE Block 1 */

            Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice,
                        &AcpiGbl_FADT.XGpe1Block, RegisterCount1,
                        AcpiGbl_FADT.Gpe1Base,
                        AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[1]);

            if (ACPI_FAILURE (Status))
            {
                ACPI_EXCEPTION ((AE_INFO, Status,
                    "Could not create GPE Block 1"));
            }

            /*
             * GPE0 and GPE1 do not have to be contiguous in the GPE number
             * space. However, GPE0 always starts at GPE number zero.
             */
            GpeNumberMax = AcpiGbl_FADT.Gpe1Base +
                            ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1);
        }
    }

    /* Exit if there are no GPE registers */

    if ((RegisterCount0 + RegisterCount1) == 0)
    {
        /* GPEs are not required by ACPI, this is OK */

        ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
            "There are no GPE blocks defined in the FADT\n"));
        Status = AE_OK;
        goto Cleanup;
    }

    /* Check for Max GPE number out-of-range */

    if (GpeNumberMax > ACPI_GPE_MAX)
    {
        ACPI_ERROR ((AE_INFO,
            "Maximum GPE number from FADT is too large: 0x%X",
            GpeNumberMax));
        Status = AE_BAD_VALUE;
        goto Cleanup;
    }

Cleanup:
    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
    return_ACPI_STATUS (AE_OK);
}