303 lines
12 KiB
C
303 lines
12 KiB
C
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/******************************************************************************
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*
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* Name: hwtimer.c - ACPI Power Management Timer Interface
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* $Revision: 4 $
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*
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*****************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#include "acpi.h"
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#include "achware.h"
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#define _COMPONENT HARDWARE
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MODULE_NAME ("hwtimer")
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/******************************************************************************
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*
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* FUNCTION: AcpiGetTimerResolution
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*
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* PARAMETERS: none
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*
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* RETURN: Number of bits of resolution in the PM Timer (24 or 32).
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*
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* DESCRIPTION: Obtains resolution of the ACPI PM Timer.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiGetTimerResolution (
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UINT32 *Resolution)
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{
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FUNCTION_TRACE ("AcpiGetTimerResolution");
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if (!Resolution)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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if (0 == AcpiGbl_FADT->TmrValExt)
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{
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*Resolution = 24;
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}
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else
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{
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*Resolution = 32;
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}
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return_ACPI_STATUS (AE_OK);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiGetTimer
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*
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* PARAMETERS: none
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*
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* RETURN: Current value of the ACPI PM Timer (in ticks).
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*
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* DESCRIPTION: Obtains current value of ACPI PM Timer.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiGetTimer (
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UINT32 *Ticks)
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{
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FUNCTION_TRACE ("AcpiGetTimer");
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if (!Ticks)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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*Ticks = AcpiOsIn32 ((ACPI_IO_ADDRESS) ACPI_GET_ADDRESS (AcpiGbl_FADT->XPmTmrBlk.Address));
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return_ACPI_STATUS (AE_OK);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiGetTimerDuration
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*
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* PARAMETERS: StartTicks
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* EndTicks
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* TimeElapsed
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*
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* RETURN: TimeElapsed
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*
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* DESCRIPTION: Computes the time elapsed (in microseconds) between two
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* PM Timer time stamps, taking into account the possibility of
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* rollovers, the timer resolution, and timer frequency.
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*
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* The PM Timer's clock ticks at roughly 3.6 times per
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* _microsecond_, and its clock continues through Cx state
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* transitions (unlike many CPU timestamp counters) -- making it
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* a versatile and accurate timer.
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*
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* Note that this function accomodates only a single timer
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* rollover. Thus for 24-bit timers, this function should only
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* be used for calculating durations less than ~4.6 seconds
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* (~20 hours for 32-bit timers).
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiGetTimerDuration (
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UINT32 StartTicks,
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UINT32 EndTicks,
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UINT32 *TimeElapsed)
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{
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UINT32 DeltaTicks = 0;
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UINT32 Seconds = 0;
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UINT32 Milliseconds = 0;
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UINT32 Microseconds = 0;
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UINT32 Remainder = 0;
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FUNCTION_TRACE ("AcpiGetTimerDuration");
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if (!TimeElapsed)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/*
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* Compute Tick Delta:
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* -------------------
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* Handle timer rollovers on 24- versus 32-bit timers.
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*/
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if (StartTicks < EndTicks)
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{
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DeltaTicks = EndTicks - StartTicks;
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}
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else if (StartTicks > EndTicks)
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{
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/* 24-bit Timer */
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if (0 == AcpiGbl_FADT->TmrValExt)
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{
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DeltaTicks = (0x00FFFFFF - StartTicks) + EndTicks;
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}
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/* 32-bit Timer */
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else
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{
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DeltaTicks = (0xFFFFFFFF - StartTicks) + EndTicks;
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}
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}
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/*
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* Compute Duration:
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* -----------------
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* Since certain compilers (gcc/Linux, argh!) don't support 64-bit
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* divides in kernel-space we have to do some trickery to preserve
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* accuracy while using 32-bit math.
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*
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* TODO: Change to use 64-bit math when supported.
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*
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* The process is as follows:
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* 1. Compute the number of seconds by dividing Delta Ticks by
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* the timer frequency.
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* 2. Compute the number of milliseconds in the remainder from step #1
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* by multiplying by 1000 and then dividing by the timer frequency.
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* 3. Compute the number of microseconds in the remainder from step #2
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* by multiplying by 1000 and then dividing by the timer frequency.
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* 4. Add the results from steps 1, 2, and 3 to get the total duration.
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*
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* Example: The time elapsed for DeltaTicks = 0xFFFFFFFF should be
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* 1199864031 microseconds. This is computed as follows:
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* Step #1: Seconds = 1199; Remainder = 3092840
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* Step #2: Milliseconds = 864; Remainder = 113120
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* Step #3: Microseconds = 31; Remainder = <don't care!>
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*/
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/* Step #1 */
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Seconds = DeltaTicks / PM_TIMER_FREQUENCY;
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Remainder = DeltaTicks % PM_TIMER_FREQUENCY;
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/* Step #2 */
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Milliseconds = (Remainder * 1000) / PM_TIMER_FREQUENCY;
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Remainder = (Remainder * 1000) % PM_TIMER_FREQUENCY;
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/* Step #3 */
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Microseconds = (Remainder * 1000) / PM_TIMER_FREQUENCY;
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/* Step #4 */
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*TimeElapsed = Seconds * 1000000;
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*TimeElapsed += Milliseconds * 1000;
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*TimeElapsed += Microseconds;
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return_ACPI_STATUS (AE_OK);
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}
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