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/**
*
* @file xwdtps_selftest.c
* @addtogroup wdtps_v3_0
* @{
*
* Contains diagnostic self-test functions for the XWdtPs driver.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ------ -------- --------------------------------------------
* 1.00a ecm/jz 01/15/10 First release
* 1.02a sg 08/01/12 Modified it use the Reset Length mask for the self
* test for CR 658287
* 3.00 kvn 02/13/15 Modified code for MISRA-C:2012 compliance.
* </pre>
*
******************************************************************************/
/***************************** Include Files *********************************/
#include "xil_types.h"
#include "xil_assert.h"
#include "xwdtps.h"
/************************** Constant Definitions *****************************/
/**************************** Type Definitions *******************************/
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
/************************** Variable Definitions *****************************/
/****************************************************************************/
/**
*
* Run a self-test on the timebase. This test verifies that the register access
* locking functions. This is tested by trying to alter a register without
* setting the key value and verifying that the register contents did not
* change.
*
* @param InstancePtr is a pointer to the XWdtPs instance.
*
* @return
* - XST_SUCCESS if self-test was successful.
* - XST_FAILURE if self-test was not successful.
*
* @note None.
*
******************************************************************************/
s32 XWdtPs_SelfTest(XWdtPs *InstancePtr)
{
u32 ZmrOrig;
u32 ZmrValue1;
u32 ZmrValue2;
s32 Status;
/*
* Assert to ensure the inputs are valid and the instance has been
* initialized.
*/
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/*
* Read the ZMR register at start the test.
*/
ZmrOrig = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
XWDTPS_ZMR_OFFSET);
/*
* EX-OR in the length of the interrupt pulse,
* do not set the key value.
*/
ZmrValue1 = ZmrOrig ^ (u32)XWDTPS_ZMR_RSTLN_MASK;
/*
* Try to write to register w/o key value then read back.
*/
XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
ZmrValue1);
ZmrValue2 = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
XWDTPS_ZMR_OFFSET);
if (ZmrValue1 == ZmrValue2) {
/*
* If the values match, the hw failed the test,
* return orig register value.
*/
XWdtPs_WriteReg(InstancePtr->Config.BaseAddress,
XWDTPS_ZMR_OFFSET,
(ZmrOrig | (u32)XWDTPS_ZMR_ZKEY_VAL));
Status = XST_FAILURE;
} else {
/*
* Try to write to register with key value then read back.
*/
XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
(ZmrValue1 | XWDTPS_ZMR_ZKEY_VAL));
ZmrValue2 = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
XWDTPS_ZMR_OFFSET);
if (ZmrValue1 != ZmrValue2) {
/*
* If the values do not match, the hw failed the test,
* return orig register value.
*/
XWdtPs_WriteReg(InstancePtr->Config.BaseAddress,
XWDTPS_ZMR_OFFSET,
ZmrOrig | XWDTPS_ZMR_ZKEY_VAL);
Status = XST_FAILURE;
} else {
/*
* The hardware locking feature is functional, return the original value
* and return success.
*/
XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
ZmrOrig | XWDTPS_ZMR_ZKEY_VAL);
Status = XST_SUCCESS;
}
}
return Status;
}
/** @} */