728 lines
21 KiB
C
728 lines
21 KiB
C
/*******************************************************************************
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*
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* Module Name: hwregs - Read/write access functions for the various ACPI
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* control and status registers.
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "acevents.h"
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#define _COMPONENT ACPI_HARDWARE
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ACPI_MODULE_NAME ("hwregs")
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#if (!ACPI_REDUCED_HARDWARE)
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/* Local Prototypes */
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static ACPI_STATUS
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AcpiHwReadMultiple (
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UINT32 *Value,
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ACPI_GENERIC_ADDRESS *RegisterA,
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ACPI_GENERIC_ADDRESS *RegisterB);
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static ACPI_STATUS
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AcpiHwWriteMultiple (
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UINT32 Value,
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ACPI_GENERIC_ADDRESS *RegisterA,
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ACPI_GENERIC_ADDRESS *RegisterB);
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#endif /* !ACPI_REDUCED_HARDWARE */
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/******************************************************************************
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*
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* FUNCTION: AcpiHwValidateRegister
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*
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* PARAMETERS: Reg - GAS register structure
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* MaxBitWidth - Max BitWidth supported (32 or 64)
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* Address - Pointer to where the gas->address
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* is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Validate the contents of a GAS register. Checks the GAS
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* pointer, Address, SpaceId, BitWidth, and BitOffset.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwValidateRegister (
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ACPI_GENERIC_ADDRESS *Reg,
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UINT8 MaxBitWidth,
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UINT64 *Address)
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{
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/* Must have a valid pointer to a GAS structure */
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if (!Reg)
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{
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return (AE_BAD_PARAMETER);
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}
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/*
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* Copy the target address. This handles possible alignment issues.
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* Address must not be null. A null address also indicates an optional
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* ACPI register that is not supported, so no error message.
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*/
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ACPI_MOVE_64_TO_64 (Address, &Reg->Address);
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if (!(*Address))
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{
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return (AE_BAD_ADDRESS);
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}
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/* Validate the SpaceID */
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if ((Reg->SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
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(Reg->SpaceId != ACPI_ADR_SPACE_SYSTEM_IO))
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{
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ACPI_ERROR ((AE_INFO,
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"Unsupported address space: 0x%X", Reg->SpaceId));
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return (AE_SUPPORT);
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}
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/* Validate the BitWidth */
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if ((Reg->BitWidth != 8) &&
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(Reg->BitWidth != 16) &&
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(Reg->BitWidth != 32) &&
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(Reg->BitWidth != MaxBitWidth))
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{
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ACPI_ERROR ((AE_INFO,
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"Unsupported register bit width: 0x%X", Reg->BitWidth));
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return (AE_SUPPORT);
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}
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/* Validate the BitOffset. Just a warning for now. */
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if (Reg->BitOffset != 0)
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{
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ACPI_WARNING ((AE_INFO,
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"Unsupported register bit offset: 0x%X", Reg->BitOffset));
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}
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return (AE_OK);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiHwRead
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*
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* PARAMETERS: Value - Where the value is returned
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* Reg - GAS register structure
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read from either memory or IO space. This is a 32-bit max
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* version of AcpiRead, used internally since the overhead of
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* 64-bit values is not needed.
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*
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* LIMITATIONS: <These limitations also apply to AcpiHwWrite>
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* BitWidth must be exactly 8, 16, or 32.
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* SpaceID must be SystemMemory or SystemIO.
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* BitOffset and AccessWidth are currently ignored, as there has
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* not been a need to implement these.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwRead (
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UINT32 *Value,
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ACPI_GENERIC_ADDRESS *Reg)
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{
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UINT64 Address;
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UINT64 Value64;
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ACPI_STATUS Status;
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ACPI_FUNCTION_NAME (HwRead);
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/* Validate contents of the GAS register */
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Status = AcpiHwValidateRegister (Reg, 32, &Address);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/* Initialize entire 32-bit return value to zero */
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*Value = 0;
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/*
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* Two address spaces supported: Memory or IO. PCI_Config is
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* not supported here because the GAS structure is insufficient
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*/
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if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
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{
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Status = AcpiOsReadMemory ((ACPI_PHYSICAL_ADDRESS)
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Address, &Value64, Reg->BitWidth);
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*Value = (UINT32) Value64;
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}
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else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
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{
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Status = AcpiHwReadPort ((ACPI_IO_ADDRESS)
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Address, Value, Reg->BitWidth);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_IO,
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"Read: %8.8X width %2d from %8.8X%8.8X (%s)\n",
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*Value, Reg->BitWidth, ACPI_FORMAT_UINT64 (Address),
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AcpiUtGetRegionName (Reg->SpaceId)));
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return (Status);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiHwWrite
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*
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* PARAMETERS: Value - Value to be written
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* Reg - GAS register structure
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write to either memory or IO space. This is a 32-bit max
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* version of AcpiWrite, used internally since the overhead of
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* 64-bit values is not needed.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwWrite (
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UINT32 Value,
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ACPI_GENERIC_ADDRESS *Reg)
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{
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UINT64 Address;
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ACPI_STATUS Status;
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ACPI_FUNCTION_NAME (HwWrite);
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/* Validate contents of the GAS register */
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Status = AcpiHwValidateRegister (Reg, 32, &Address);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/*
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* Two address spaces supported: Memory or IO. PCI_Config is
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* not supported here because the GAS structure is insufficient
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*/
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if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
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{
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Status = AcpiOsWriteMemory ((ACPI_PHYSICAL_ADDRESS)
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Address, (UINT64) Value, Reg->BitWidth);
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}
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else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
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{
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Status = AcpiHwWritePort ((ACPI_IO_ADDRESS)
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Address, Value, Reg->BitWidth);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_IO,
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"Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
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Value, Reg->BitWidth, ACPI_FORMAT_UINT64 (Address),
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AcpiUtGetRegionName (Reg->SpaceId)));
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return (Status);
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}
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#if (!ACPI_REDUCED_HARDWARE)
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwClearAcpiStatus
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Clears all fixed and general purpose status bits
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwClearAcpiStatus (
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void)
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{
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ACPI_STATUS Status;
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ACPI_CPU_FLAGS LockFlags = 0;
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ACPI_FUNCTION_TRACE (HwClearAcpiStatus);
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ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %04X to %8.8X%8.8X\n",
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ACPI_BITMASK_ALL_FIXED_STATUS,
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ACPI_FORMAT_UINT64 (AcpiGbl_XPm1aStatus.Address)));
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LockFlags = AcpiOsAcquireLock (AcpiGbl_HardwareLock);
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/* Clear the fixed events in PM1 A/B */
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Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_STATUS,
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ACPI_BITMASK_ALL_FIXED_STATUS);
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AcpiOsReleaseLock (AcpiGbl_HardwareLock, LockFlags);
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if (ACPI_FAILURE (Status))
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{
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goto Exit;
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}
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/* Clear the GPE Bits in all GPE registers in all GPE blocks */
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Status = AcpiEvWalkGpeList (AcpiHwClearGpeBlock, NULL);
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Exit:
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwGetBitRegisterInfo
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*
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* PARAMETERS: RegisterId - Index of ACPI Register to access
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*
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* RETURN: The bitmask to be used when accessing the register
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*
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* DESCRIPTION: Map RegisterId into a register bitmask.
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*
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******************************************************************************/
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ACPI_BIT_REGISTER_INFO *
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AcpiHwGetBitRegisterInfo (
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UINT32 RegisterId)
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{
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ACPI_FUNCTION_ENTRY ();
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if (RegisterId > ACPI_BITREG_MAX)
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{
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ACPI_ERROR ((AE_INFO, "Invalid BitRegister ID: 0x%X", RegisterId));
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return (NULL);
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}
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return (&AcpiGbl_BitRegisterInfo[RegisterId]);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiHwWritePm1Control
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*
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* PARAMETERS: Pm1aControl - Value to be written to PM1A control
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* Pm1bControl - Value to be written to PM1B control
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write the PM1 A/B control registers. These registers are
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* different than than the PM1 A/B status and enable registers
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* in that different values can be written to the A/B registers.
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* Most notably, the SLP_TYP bits can be different, as per the
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* values returned from the _Sx predefined methods.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwWritePm1Control (
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UINT32 Pm1aControl,
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UINT32 Pm1bControl)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (HwWritePm1Control);
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Status = AcpiHwWrite (Pm1aControl, &AcpiGbl_FADT.XPm1aControlBlock);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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if (AcpiGbl_FADT.XPm1bControlBlock.Address)
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{
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Status = AcpiHwWrite (Pm1bControl, &AcpiGbl_FADT.XPm1bControlBlock);
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}
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return_ACPI_STATUS (Status);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiHwRegisterRead
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*
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* PARAMETERS: RegisterId - ACPI Register ID
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* ReturnValue - Where the register value is returned
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*
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* RETURN: Status and the value read.
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*
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* DESCRIPTION: Read from the specified ACPI register
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwRegisterRead (
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UINT32 RegisterId,
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UINT32 *ReturnValue)
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{
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UINT32 Value = 0;
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (HwRegisterRead);
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switch (RegisterId)
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{
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case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */
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Status = AcpiHwReadMultiple (&Value,
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&AcpiGbl_XPm1aStatus,
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&AcpiGbl_XPm1bStatus);
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break;
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case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */
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Status = AcpiHwReadMultiple (&Value,
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&AcpiGbl_XPm1aEnable,
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&AcpiGbl_XPm1bEnable);
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break;
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case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */
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Status = AcpiHwReadMultiple (&Value,
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&AcpiGbl_FADT.XPm1aControlBlock,
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&AcpiGbl_FADT.XPm1bControlBlock);
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/*
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* Zero the write-only bits. From the ACPI specification, "Hardware
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* Write-Only Bits": "Upon reads to registers with write-only bits,
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* software masks out all write-only bits."
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*/
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Value &= ~ACPI_PM1_CONTROL_WRITEONLY_BITS;
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break;
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case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
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Status = AcpiHwRead (&Value, &AcpiGbl_FADT.XPm2ControlBlock);
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break;
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case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
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Status = AcpiHwRead (&Value, &AcpiGbl_FADT.XPmTimerBlock);
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break;
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case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
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Status = AcpiHwReadPort (AcpiGbl_FADT.SmiCommand, &Value, 8);
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break;
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default:
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ACPI_ERROR ((AE_INFO, "Unknown Register ID: 0x%X",
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RegisterId));
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Status = AE_BAD_PARAMETER;
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break;
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}
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if (ACPI_SUCCESS (Status))
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{
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*ReturnValue = Value;
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}
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return_ACPI_STATUS (Status);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiHwRegisterWrite
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*
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* PARAMETERS: RegisterId - ACPI Register ID
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* Value - The value to write
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write to the specified ACPI register
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*
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* NOTE: In accordance with the ACPI specification, this function automatically
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* preserves the value of the following bits, meaning that these bits cannot be
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* changed via this interface:
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*
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* PM1_CONTROL[0] = SCI_EN
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* PM1_CONTROL[9]
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* PM1_STATUS[11]
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*
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* ACPI References:
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* 1) Hardware Ignored Bits: When software writes to a register with ignored
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* bit fields, it preserves the ignored bit fields
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* 2) SCI_EN: OSPM always preserves this bit position
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwRegisterWrite (
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UINT32 RegisterId,
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UINT32 Value)
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{
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ACPI_STATUS Status;
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UINT32 ReadValue;
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ACPI_FUNCTION_TRACE (HwRegisterWrite);
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switch (RegisterId)
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{
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case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */
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/*
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* Handle the "ignored" bit in PM1 Status. According to the ACPI
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* specification, ignored bits are to be preserved when writing.
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* Normally, this would mean a read/modify/write sequence. However,
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* preserving a bit in the status register is different. Writing a
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* one clears the status, and writing a zero preserves the status.
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* Therefore, we must always write zero to the ignored bit.
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*
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* This behavior is clarified in the ACPI 4.0 specification.
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*/
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Value &= ~ACPI_PM1_STATUS_PRESERVED_BITS;
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Status = AcpiHwWriteMultiple (Value,
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&AcpiGbl_XPm1aStatus,
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&AcpiGbl_XPm1bStatus);
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break;
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case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */
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Status = AcpiHwWriteMultiple (Value,
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&AcpiGbl_XPm1aEnable,
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&AcpiGbl_XPm1bEnable);
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break;
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case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */
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/*
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* Perform a read first to preserve certain bits (per ACPI spec)
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* Note: This includes SCI_EN, we never want to change this bit
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*/
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Status = AcpiHwReadMultiple (&ReadValue,
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&AcpiGbl_FADT.XPm1aControlBlock,
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&AcpiGbl_FADT.XPm1bControlBlock);
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if (ACPI_FAILURE (Status))
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{
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goto Exit;
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}
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/* Insert the bits to be preserved */
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ACPI_INSERT_BITS (Value, ACPI_PM1_CONTROL_PRESERVED_BITS, ReadValue);
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|
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/* Now we can write the data */
|
|
|
|
Status = AcpiHwWriteMultiple (Value,
|
|
&AcpiGbl_FADT.XPm1aControlBlock,
|
|
&AcpiGbl_FADT.XPm1bControlBlock);
|
|
break;
|
|
|
|
case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
|
|
/*
|
|
* For control registers, all reserved bits must be preserved,
|
|
* as per the ACPI spec.
|
|
*/
|
|
Status = AcpiHwRead (&ReadValue, &AcpiGbl_FADT.XPm2ControlBlock);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
goto Exit;
|
|
}
|
|
|
|
/* Insert the bits to be preserved */
|
|
|
|
ACPI_INSERT_BITS (Value, ACPI_PM2_CONTROL_PRESERVED_BITS, ReadValue);
|
|
|
|
Status = AcpiHwWrite (Value, &AcpiGbl_FADT.XPm2ControlBlock);
|
|
break;
|
|
|
|
case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
|
|
|
|
Status = AcpiHwWrite (Value, &AcpiGbl_FADT.XPmTimerBlock);
|
|
break;
|
|
|
|
case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
|
|
|
|
/* SMI_CMD is currently always in IO space */
|
|
|
|
Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, Value, 8);
|
|
break;
|
|
|
|
default:
|
|
|
|
ACPI_ERROR ((AE_INFO, "Unknown Register ID: 0x%X",
|
|
RegisterId));
|
|
Status = AE_BAD_PARAMETER;
|
|
break;
|
|
}
|
|
|
|
Exit:
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
|
|
/******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiHwReadMultiple
|
|
*
|
|
* PARAMETERS: Value - Where the register value is returned
|
|
* RegisterA - First ACPI register (required)
|
|
* RegisterB - Second ACPI register (optional)
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Read from the specified two-part ACPI register (such as PM1 A/B)
|
|
*
|
|
******************************************************************************/
|
|
|
|
static ACPI_STATUS
|
|
AcpiHwReadMultiple (
|
|
UINT32 *Value,
|
|
ACPI_GENERIC_ADDRESS *RegisterA,
|
|
ACPI_GENERIC_ADDRESS *RegisterB)
|
|
{
|
|
UINT32 ValueA = 0;
|
|
UINT32 ValueB = 0;
|
|
ACPI_STATUS Status;
|
|
|
|
|
|
/* The first register is always required */
|
|
|
|
Status = AcpiHwRead (&ValueA, RegisterA);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return (Status);
|
|
}
|
|
|
|
/* Second register is optional */
|
|
|
|
if (RegisterB->Address)
|
|
{
|
|
Status = AcpiHwRead (&ValueB, RegisterB);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return (Status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OR the two return values together. No shifting or masking is necessary,
|
|
* because of how the PM1 registers are defined in the ACPI specification:
|
|
*
|
|
* "Although the bits can be split between the two register blocks (each
|
|
* register block has a unique pointer within the FADT), the bit positions
|
|
* are maintained. The register block with unimplemented bits (that is,
|
|
* those implemented in the other register block) always returns zeros,
|
|
* and writes have no side effects"
|
|
*/
|
|
*Value = (ValueA | ValueB);
|
|
return (AE_OK);
|
|
}
|
|
|
|
|
|
/******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiHwWriteMultiple
|
|
*
|
|
* PARAMETERS: Value - The value to write
|
|
* RegisterA - First ACPI register (required)
|
|
* RegisterB - Second ACPI register (optional)
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Write to the specified two-part ACPI register (such as PM1 A/B)
|
|
*
|
|
******************************************************************************/
|
|
|
|
static ACPI_STATUS
|
|
AcpiHwWriteMultiple (
|
|
UINT32 Value,
|
|
ACPI_GENERIC_ADDRESS *RegisterA,
|
|
ACPI_GENERIC_ADDRESS *RegisterB)
|
|
{
|
|
ACPI_STATUS Status;
|
|
|
|
|
|
/* The first register is always required */
|
|
|
|
Status = AcpiHwWrite (Value, RegisterA);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return (Status);
|
|
}
|
|
|
|
/*
|
|
* Second register is optional
|
|
*
|
|
* No bit shifting or clearing is necessary, because of how the PM1
|
|
* registers are defined in the ACPI specification:
|
|
*
|
|
* "Although the bits can be split between the two register blocks (each
|
|
* register block has a unique pointer within the FADT), the bit positions
|
|
* are maintained. The register block with unimplemented bits (that is,
|
|
* those implemented in the other register block) always returns zeros,
|
|
* and writes have no side effects"
|
|
*/
|
|
if (RegisterB->Address)
|
|
{
|
|
Status = AcpiHwWrite (Value, RegisterB);
|
|
}
|
|
|
|
return (Status);
|
|
}
|
|
|
|
#endif /* !ACPI_REDUCED_HARDWARE */
|