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   1 /******************************************************************************
   2 *
   3 * Copyright (C) 2010 - 2015 Xilinx, Inc.  All rights reserved.
   4 *
   5 * Permission is hereby granted, free of charge, to any person obtaining a copy
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  10 * furnished to do so, subject to the following conditions:
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  12 * The above copyright notice and this permission notice shall be included in
  13 * all copies or substantial portions of the Software.
  14 *
  15 * Use of the Software is limited solely to applications:
  16 * (a) running on a Xilinx device, or
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  18 *
  19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  29 * this Software without prior written authorization from Xilinx.
  30 *
  31 ******************************************************************************/
  32 /****************************************************************************/
  33 /**
  34 *
  35 * @file xwdtps_selftest.c
  36 * @addtogroup wdtps_v3_0
  37 * @{
  38 *
  39 * Contains diagnostic self-test functions for the XWdtPs driver.
  40 *
  41 * <pre>
  42 * MODIFICATION HISTORY:
  43 *
  44 * Ver   Who    Date     Changes
  45 * ----- ------ -------- --------------------------------------------
  46 * 1.00a ecm/jz 01/15/10 First release
  47 * 1.02a sg     08/01/12 Modified it use the Reset Length mask for the self
  48 *                       test for CR 658287
  49 * 3.00  kvn    02/13/15 Modified code for MISRA-C:2012 compliance.
  50 * </pre>
  51 *
  52 ******************************************************************************/
  53
  54 /***************************** Include Files *********************************/
  55
  56 #include "xil_types.h"
  57 #include "xil_assert.h"
  58 #include "xwdtps.h"
  59
  60 /************************** Constant Definitions *****************************/
  61
  62
  63 /**************************** Type Definitions *******************************/
  64
  65
  66 /***************** Macros (Inline Functions) Definitions *********************/
  67
  68
  69 /************************** Function Prototypes ******************************/
  70
  71
  72 /************************** Variable Definitions *****************************/
  73
  74
  75 /****************************************************************************/
  76 /**
  77 *
  78 * Run a self-test on the timebase. This test verifies that the register access
  79 * locking functions. This is tested by trying to alter a register without
  80 * setting the key value and verifying that the register contents did not
  81 * change.
  82 *
  83 * @param        InstancePtr is a pointer to the XWdtPs instance.
  84 *
  85 * @return
  86 *               - XST_SUCCESS if self-test was successful.
  87 *               - XST_FAILURE if self-test was not successful.
  88 *
  89 * @note         None.
  90 *
  91 ******************************************************************************/
  92 s32 XWdtPs_SelfTest(XWdtPs *InstancePtr)
  93 {
  94         u32 ZmrOrig;
  95         u32 ZmrValue1;
  96         u32 ZmrValue2;
  97         s32 Status;
  98
  99         /*
 100          * Assert to ensure the inputs are valid and the instance has been
 101          * initialized.
 102          */
 103         Xil_AssertNonvoid(InstancePtr != NULL);
 104         Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
 105
 106         /*
 107          * Read the ZMR register at start the test.
 108          */
 109         ZmrOrig = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
 110                                  XWDTPS_ZMR_OFFSET);
 111
 112         /*
 113          * EX-OR in the length of the interrupt pulse,
 114          * do not set the key value.
 115          */
 116         ZmrValue1 = ZmrOrig ^ (u32)XWDTPS_ZMR_RSTLN_MASK;
 117
 118
 119         /*
 120          * Try to write to register w/o key value then read back.
 121          */
 122         XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
 123                           ZmrValue1);
 124
 125         ZmrValue2 =     XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
 126                                  XWDTPS_ZMR_OFFSET);
 127
 128         if (ZmrValue1 == ZmrValue2) {
 129                 /*
 130                  * If the values match, the hw failed the test,
 131                  * return orig register value.
 132                  */
 133                 XWdtPs_WriteReg(InstancePtr->Config.BaseAddress,
 134                                   XWDTPS_ZMR_OFFSET,
 135                                   (ZmrOrig | (u32)XWDTPS_ZMR_ZKEY_VAL));
 136                 Status = XST_FAILURE;
 137         } else {
 138
 139
 140                 /*
 141                  * Try to write to register with key value then read back.
 142                  */
 143                 XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
 144                                   (ZmrValue1 | XWDTPS_ZMR_ZKEY_VAL));
 145
 146                 ZmrValue2 =     XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
 147                                          XWDTPS_ZMR_OFFSET);
 148
 149                 if (ZmrValue1 != ZmrValue2) {
 150                         /*
 151                          * If the values do not match, the hw failed the test,
 152                          * return orig register value.
 153                          */
 154                         XWdtPs_WriteReg(InstancePtr->Config.BaseAddress,
 155                                           XWDTPS_ZMR_OFFSET,
 156                                           ZmrOrig | XWDTPS_ZMR_ZKEY_VAL);
 157                         Status = XST_FAILURE;
 158
 159                 } else {
 160
 161                         /*
 162                          * The hardware locking feature is functional, return the original value
 163                          * and return success.
 164                          */
 165                         XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
 166                                           ZmrOrig | XWDTPS_ZMR_ZKEY_VAL);
 167
 168                         Status = XST_SUCCESS;
 169                 }
 170         }
 171         return Status;
 172 }
 173 /** @} */