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 /******************************************************************************
  *
  * Module Name: hwxface - Public ACPICA hardware interfaces
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
  * All rights reserved.
  *
  * 2. License
  *
  * 2.1. This is your license from Intel Corp. under its intellectual property
  * rights.  You may have additional license terms from the party that provided
  * you this software, covering your right to use that party's intellectual
  * property rights.
  *
  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  * copy of the source code appearing in this file ("Covered Code") an
  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  * base code distributed originally by Intel ("Original Intel Code") to copy,
  * make derivatives, distribute, use and display any portion of the Covered
  * Code in any form, with the right to sublicense such rights; and
  *
  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  * license (with the right to sublicense), under only those claims of Intel
  * patents that are infringed by the Original Intel Code, to make, use, sell,
  * offer to sell, and import the Covered Code and derivative works thereof
  * solely to the minimum extent necessary to exercise the above copyright
  * license, and in no event shall the patent license extend to any additions
  * to or modifications of the Original Intel Code.  No other license or right
  * is granted directly or by implication, estoppel or otherwise;
  *
  * The above copyright and patent license is granted only if the following
  * conditions are met:
  *
  * 3. Conditions
  *
  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification with rights to further distribute source must include
  * the above Copyright Notice, the above License, this list of Conditions,
  * and the following Disclaimer and Export Compliance provision.  In addition,
  * Licensee must cause all Covered Code to which Licensee contributes to
  * contain a file documenting the changes Licensee made to create that Covered
  * Code and the date of any change.  Licensee must include in that file the
  * documentation of any changes made by any predecessor Licensee.  Licensee
  * must include a prominent statement that the modification is derived,
  * directly or indirectly, from Original Intel Code.
  *
  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification without rights to further distribute source must
  * include the following Disclaimer and Export Compliance provision in the
  * documentation and/or other materials provided with distribution.  In
  * addition, Licensee may not authorize further sublicense of source of any
  * portion of the Covered Code, and must include terms to the effect that the
  * license from Licensee to its licensee is limited to the intellectual
  * property embodied in the software Licensee provides to its licensee, and
  * not to intellectual property embodied in modifications its licensee may
  * make.
  *
  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  * substantial portion of the Covered Code or modification must reproduce the
  * above Copyright Notice, and the following Disclaimer and Export Compliance
  * provision in the documentation and/or other materials provided with the
  * distribution.
  *
  * 3.4. Intel retains all right, title, and interest in and to the Original
  * Intel Code.
  *
  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  * Intel shall be used in advertising or otherwise to promote the sale, use or
  * other dealings in products derived from or relating to the Covered Code
  * without prior written authorization from Intel.
  *
  * 4. Disclaimer and Export Compliance
  *
  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  * PARTICULAR PURPOSE.
  *
  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  * LIMITED REMEDY.
  *
  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  * software or system incorporating such software without first obtaining any
  * required license or other approval from the U. S. Department of Commerce or
  * any other agency or department of the United States Government.  In the
  * event Licensee exports any such software from the United States or
  * re-exports any such software from a foreign destination, Licensee shall
  * ensure that the distribution and export/re-export of the software is in
  * compliance with all laws, regulations, orders, or other restrictions of the
  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  * any of its subsidiaries will export/re-export any technical data, process,
  * software, or service, directly or indirectly, to any country for which the
  * United States government or any agency thereof requires an export license,
  * other governmental approval, or letter of assurance, without first obtaining
  * such license, approval or letter.
  *
  *****************************************************************************/
 
 #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);
     }
 
     /* 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)
 {
     UINT32                  Value;
     UINT32                  Width;
     UINT64                  Address;
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_NAME (AcpiRead);
 
 
     if (!ReturnValue)
     {
         return (AE_BAD_PARAMETER);
     }
 
     /* Validate contents of the GAS register. Allow 64-bit transfers */
 
     Status = AcpiHwValidateRegister (Reg, 64, &Address);
     if (ACPI_FAILURE (Status))
     {
         return (Status);
     }
 
     Width = Reg->BitWidth;
     if (Width == 64)
     {
         Width = 32; /* Break into two 32-bit transfers */
     }
 
     /* Initialize entire 64-bit return value to zero */
 
     *ReturnValue = 0;
     Value = 0;
 
     /*
      * Two address spaces supported: Memory or IO. PCI_Config is
      * not supported here because the GAS structure is insufficient
      */
     if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
     {
         Status = AcpiOsReadMemory ((ACPI_PHYSICAL_ADDRESS)
                     Address, &Value, Width);
         if (ACPI_FAILURE (Status))
         {
             return (Status);
         }
         *ReturnValue = Value;
 
         if (Reg->BitWidth == 64)
         {
             /* Read the top 32 bits */
 
             Status = AcpiOsReadMemory ((ACPI_PHYSICAL_ADDRESS)
                         (Address + 4), &Value, 32);
             if (ACPI_FAILURE (Status))
             {
                 return (Status);
             }
             *ReturnValue |= ((UINT64) Value << 32);
         }
     }
     else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
     {
         Status = AcpiHwReadPort ((ACPI_IO_ADDRESS)
                     Address, &Value, Width);
         if (ACPI_FAILURE (Status))
         {
             return (Status);
         }
         *ReturnValue = Value;
 
         if (Reg->BitWidth == 64)
         {
             /* Read the top 32 bits */
 
             Status = AcpiHwReadPort ((ACPI_IO_ADDRESS)
                         (Address + 4), &Value, 32);
             if (ACPI_FAILURE (Status))
             {
                 return (Status);
             }
             *ReturnValue |= ((UINT64) Value << 32);
         }
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_IO,
         "Read:  %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n",
         ACPI_FORMAT_UINT64 (*ReturnValue), Reg->BitWidth,
         ACPI_FORMAT_UINT64 (Address),
         AcpiUtGetRegionName (Reg->SpaceId)));
 
     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)
 {
     UINT32                  Width;
     UINT64                  Address;
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_NAME (AcpiWrite);
 
 
     /* Validate contents of the GAS register. Allow 64-bit transfers */
 
     Status = AcpiHwValidateRegister (Reg, 64, &Address);
     if (ACPI_FAILURE (Status))
     {
         return (Status);
     }
 
     Width = Reg->BitWidth;
     if (Width == 64)
     {
         Width = 32; /* Break into two 32-bit transfers */
     }
 
     /*
      * Two address spaces supported: Memory or IO. PCI_Config is
      * not supported here because the GAS structure is insufficient
      */
     if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
     {
         Status = AcpiOsWriteMemory ((ACPI_PHYSICAL_ADDRESS)
                     Address, ACPI_LODWORD (Value), Width);
         if (ACPI_FAILURE (Status))
         {
             return (Status);
         }
 
         if (Reg->BitWidth == 64)
         {
             Status = AcpiOsWriteMemory ((ACPI_PHYSICAL_ADDRESS)
                         (Address + 4), ACPI_HIDWORD (Value), 32);
             if (ACPI_FAILURE (Status))
             {
                 return (Status);
             }
         }
     }
     else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
     {
         Status = AcpiHwWritePort ((ACPI_IO_ADDRESS)
                     Address, ACPI_LODWORD (Value), Width);
         if (ACPI_FAILURE (Status))
         {
             return (Status);
         }
 
         if (Reg->BitWidth == 64)
         {
             Status = AcpiHwWritePort ((ACPI_IO_ADDRESS)
                         (Address + 4), ACPI_HIDWORD (Value), 32);
             if (ACPI_FAILURE (Status))
             {
                 return (Status);
             }
         }
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_IO,
         "Wrote: %8.8X%8.8X width %2d   to %8.8X%8.8X (%s)\n",
         ACPI_FORMAT_UINT64 (Value), Reg->BitWidth,
         ACPI_FORMAT_UINT64 (Address),
         AcpiUtGetRegionName (Reg->SpaceId)));
 
     return (Status);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiWrite)
 
 
 /*******************************************************************************
  *
  * 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 automaticallly
  *                                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)
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiGetSleepTypeData
  *
  * PARAMETERS:  SleepState          - Numeric sleep state
  *              *SleepTypeA         - Where SLP_TYPa is returned
  *              *SleepTypeB         - Where SLP_TYPb is returned
  *
  * RETURN:      Status - ACPI status
  *
  * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
  *              state.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiGetSleepTypeData (
     UINT8                   SleepState,
     UINT8                   *SleepTypeA,
     UINT8                   *SleepTypeB)
 {
     ACPI_STATUS             Status = AE_OK;
     ACPI_EVALUATE_INFO      *Info;
 
 
     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);
     }
 
     Info->Pathname = ACPI_CAST_PTR (char, AcpiGbl_SleepStateNames[SleepState]);
 
     /* Evaluate the namespace object containing the values for this state */
 
     Status = AcpiNsEvaluate (Info);
     if (ACPI_FAILURE (Status))
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
             "%s while evaluating SleepState [%s]\n",
             AcpiFormatException (Status), Info->Pathname));
 
         goto Cleanup;
     }
 
     /* Must have a return object */
 
     if (!Info->ReturnObject)
     {
         ACPI_ERROR ((AE_INFO, "No Sleep State object returned from [%s]",
             Info->Pathname));
         Status = AE_NOT_EXIST;
     }
 
     /* It must be of type Package */
 
     else 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;
     }
 
     /*
      * The package must have at least two elements. NOTE (March 2005): This
      * goes against the current ACPI spec which defines this object as a
      * package with one encoded DWORD element. However, existing practice
      * by BIOS vendors seems to be to have 2 or more elements, at least
      * one per sleep type (A/B).
      */
     else if (Info->ReturnObject->Package.Count < 2)
     {
         ACPI_ERROR ((AE_INFO,
             "Sleep State return package does not have at least two elements"));
         Status = AE_AML_NO_OPERAND;
     }
 
     /* The first two elements must both be of type Integer */
 
     else if (((Info->ReturnObject->Package.Elements[0])->Common.Type
                 != ACPI_TYPE_INTEGER) ||
              ((Info->ReturnObject->Package.Elements[1])->Common.Type
                 != ACPI_TYPE_INTEGER))
     {
         ACPI_ERROR ((AE_INFO,
             "Sleep State return package elements are not both Integers "
             "(%s, %s)",
             AcpiUtGetObjectTypeName (Info->ReturnObject->Package.Elements[0]),
             AcpiUtGetObjectTypeName (Info->ReturnObject->Package.Elements[1])));
         Status = AE_AML_OPERAND_TYPE;
     }
     else
     {
         /* Valid _Sx_ package size, type, and value */
 
         *SleepTypeA = (UINT8)
             (Info->ReturnObject->Package.Elements[0])->Integer.Value;
         *SleepTypeB = (UINT8)
             (Info->ReturnObject->Package.Elements[1])->Integer.Value;
     }
 
     if (ACPI_FAILURE (Status))
     {
         ACPI_EXCEPTION ((AE_INFO, Status,
             "While evaluating SleepState [%s], bad Sleep object %p type %s",
             Info->Pathname, Info->ReturnObject,
             AcpiUtGetObjectTypeName (Info->ReturnObject)));
     }
 
     AcpiUtRemoveReference (Info->ReturnObject);
 
 Cleanup:
     ACPI_FREE (Info);
     return_ACPI_STATUS (Status);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiGetSleepTypeData)