177 lines
6.0 KiB
C
177 lines
6.0 KiB
C
/******************************************************************************
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* Filename: vims.c
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* Revised: 2020-02-14 11:30:20 +0100 (Fri, 14 Feb 2020)
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* Revision: 56760
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*
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* Description: Driver for the VIMS.
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*
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* Copyright (c) 2015 - 2017, Texas Instruments Incorporated
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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 are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of the ORGANIZATION nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************/
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#include "vims.h"
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//*****************************************************************************
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//
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// Handle support for DriverLib in ROM:
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// This section will undo prototype renaming made in the header file
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//
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//*****************************************************************************
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#if !defined(DOXYGEN)
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#undef VIMSConfigure
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#define VIMSConfigure NOROM_VIMSConfigure
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#undef VIMSModeSet
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#define VIMSModeSet NOROM_VIMSModeSet
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#undef VIMSModeGet
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#define VIMSModeGet NOROM_VIMSModeGet
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#undef VIMSModeSafeSet
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#define VIMSModeSafeSet NOROM_VIMSModeSafeSet
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#endif
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//*****************************************************************************
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//
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// Configures the VIMS.
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//
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//*****************************************************************************
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void
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VIMSConfigure(uint32_t ui32Base, bool bRoundRobin, bool bPrefetch)
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{
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uint32_t ui32Reg;
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// Check the arguments.
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ASSERT(VIMSBaseValid(ui32Base));
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ui32Reg = HWREG(ui32Base + VIMS_O_CTL);
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ui32Reg &= ~(VIMS_CTL_PREF_EN | VIMS_CTL_ARB_CFG);
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if(bRoundRobin)
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{
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ui32Reg |= VIMS_CTL_ARB_CFG;
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}
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if(bPrefetch)
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{
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ui32Reg |= VIMS_CTL_PREF_EN;
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}
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// Set the Arbitration and prefetch mode.
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HWREG(ui32Base + VIMS_O_CTL) = ui32Reg;
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}
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//*****************************************************************************
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//
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// Set the operational mode of the VIMS
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//
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//*****************************************************************************
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void
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VIMSModeSet(uint32_t ui32Base, uint32_t ui32Mode)
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{
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uint32_t ui32Reg;
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// Check the arguments.
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ASSERT(VIMSBaseValid(ui32Base));
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ASSERT((ui32Mode == VIMS_MODE_DISABLED) ||
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(ui32Mode == VIMS_MODE_ENABLED) ||
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(ui32Mode == VIMS_MODE_OFF));
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// Set the mode.
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ui32Reg = HWREG(ui32Base + VIMS_O_CTL);
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ui32Reg &= ~VIMS_CTL_MODE_M;
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ui32Reg |= (ui32Mode & VIMS_CTL_MODE_M);
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HWREG(ui32Base + VIMS_O_CTL) = ui32Reg;
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}
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//*****************************************************************************
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//
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// Get the current operational mode of the VIMS.
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//
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//*****************************************************************************
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uint32_t
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VIMSModeGet(uint32_t ui32Base)
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{
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uint32_t ui32Reg;
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// Check the arguments.
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ASSERT(VIMSBaseValid(ui32Base));
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ui32Reg = HWREG(ui32Base + VIMS_O_STAT);
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if(ui32Reg & VIMS_STAT_MODE_CHANGING)
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{
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return (VIMS_MODE_CHANGING);
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}
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else
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{
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return (ui32Reg & VIMS_STAT_MODE_M);
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}
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}
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//*****************************************************************************
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//
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// Safe setting of new VIMS mode
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// - Function might be blocking
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// - Can be called for any mode change (also if actually not changing mode)
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//
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//*****************************************************************************
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void
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VIMSModeSafeSet( uint32_t ui32Base, uint32_t ui32NewMode, bool blocking )
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{
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uint32_t currentMode;
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// Check the arguments.
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ASSERT(VIMSBaseValid(ui32Base));
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ASSERT((ui32NewMode == VIMS_MODE_DISABLED) ||
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(ui32NewMode == VIMS_MODE_ENABLED) ||
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(ui32NewMode == VIMS_MODE_OFF));
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// Make sure that only the mode bits are set in the input parameter
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// (done just for security since it is critical to the code flow)
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ui32NewMode &= VIMS_CTL_MODE_M;
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// Wait for any pending change to complete and get current VIMS mode
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// (This is a blocking point but will typically only be a blocking point
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// only if mode is changed multiple times with blocking=0)
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do {
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currentMode = VIMSModeGet( ui32Base );
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} while ( currentMode == VIMS_MODE_CHANGING );
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// First check that it actually is a mode change request
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if ( ui32NewMode != currentMode ) {
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// Set new mode
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VIMSModeSet( ui32Base, ui32NewMode );
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// Wait for final mode change to complete - if blocking is requested
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if ( blocking ) {
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while ( HWREGBITW( VIMS_BASE + VIMS_O_STAT, VIMS_STAT_MODE_CHANGING_BITN )) {
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// Do nothing - wait for change to complete.
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}
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}
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}
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}
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