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/*
* Copyright (c) 2013 - 2015, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "fsl_wdog_driver.h"
#include "fsl_interrupt_manager.h"
#include "fsl_clock_manager.h"
#if FSL_FEATURE_SOC_WDOG_COUNT
/*******************************************************************************
* Variables
*******************************************************************************/
static uint32_t wdogWctInstructionCount;
/*******************************************************************************
* Code
*******************************************************************************/
/*FUNCTION****************************************************************
*
* Function Name : WDOG_DRV_Unlock
* Description : Unlock watchdog register written
* This function is used to unlock the WDOG register written because WDOG register
* will lock automatically after 256 bus clock. Written while the register is
* locked has no affect.
*
*END*********************************************************************/
static void WDOG_DRV_Unlock(void)
{
WDOG_Type *base = g_wdogBase[0];
INT_SYS_DisableIRQGlobal();
WDOG_HAL_Unlock(base);
INT_SYS_EnableIRQGlobal();
}
/*FUNCTION****************************************************************
*
* Function Name : WDOG_DRV_WaitWctClose
* Description : Wait until the WCT is closed
* This function is used wait until the WCT window is closed, WCT time is 256 bus cycles, here
* use nop to wait timeout, one nop running time is one core cycle.
*
*END*********************************************************************/
static void WDOG_DRV_WaitWctClose(void)
{
uint32_t count;
/* here using nop instruction, otherwise empty code will be optimized in release target */
for ( count = 0 ; count < wdogWctInstructionCount; count++ )
{
__NOP();
}
}
/*FUNCTION****************************************************************
*
* Function Name : WDOG_DRV_Init
* Description : Initialize watchdog
* This function is used to initialize the WDOG, after called, the WDOG
* will run immediately according to the configure.
*
*END*********************************************************************/
wdog_status_t WDOG_DRV_Init(const wdog_config_t* userConfigPtr)
{
uint32_t coreClockHz, busClockHz;
if(!userConfigPtr)
{
return kStatus_WDOG_NullArgument;
}
WDOG_Type *base = g_wdogBase[0];
coreClockHz = CLOCK_SYS_GetCoreClockFreq();
busClockHz = CLOCK_SYS_GetBusClockFreq();
wdogWctInstructionCount = ((coreClockHz/busClockHz) << 8); /* WCT is 256 bus clock */
WDOG_DRV_Unlock();
WDOG_HAL_SetConfig(base, userConfigPtr);
WDOG_DRV_WaitWctClose();
return kStatus_WDOG_Success;
}
/*FUNCTION****************************************************************
*
* Function Name : WDOG_DRV_Deinit
* Description : Shutdown watchdog
* This function is used to shutdown the WDOG.
*
*END*********************************************************************/
wdog_status_t WDOG_DRV_Deinit(void)
{
WDOG_Type *base = g_wdogBase[0];
WDOG_DRV_Unlock();
WDOG_HAL_Disable(base);
WDOG_DRV_WaitWctClose();
return kStatus_WDOG_Success;
}
/*FUNCTION****************************************************************
*
* Function Name : WDOG_DRV_IsRunning
* Description : Get watchdog running status
* This function is used to get the WDOG running status.
*
*END*********************************************************************/
bool WDOG_DRV_IsRunning(void)
{
WDOG_Type *base = g_wdogBase[0];
return WDOG_HAL_IsEnable(base);
}
/*FUNCTION****************************************************************
*
* Function Name : WDOG_DRV_Refresh
* Description : Refresh watchdog.
* This function is used to feed the WDOG, it will set the WDOG timer count to zero and
* should be called before watchdog timer is timeout, otherwise a RESET will assert.
*
*END*********************************************************************/
void WDOG_DRV_Refresh(void)
{
WDOG_Type *base = g_wdogBase[0];
INT_SYS_DisableIRQGlobal();
WDOG_HAL_Refresh(base);
INT_SYS_EnableIRQGlobal();
}
/*FUNCTION****************************************************************
*
* Function Name : WDOG_DRV_ResetSystem
* Description : Reset chip by watchdog
* This function is used to reset chip using WDOG.
*
*END*********************************************************************/
void WDOG_DRV_ResetSystem(void)
{
WDOG_Type *base = g_wdogBase[0];
WDOG_HAL_ResetSystem(base);
}
#endif
/*******************************************************************************
* EOF
*******************************************************************************/
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