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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
   6 * of this software and associated documentation files (the "Software"), to deal
   7 * in the Software without restriction, including without limitation the rights
   8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 * copies of the Software, and to permit persons to whom the Software is
  10 * furnished to do so, subject to the following conditions:
  11 *
  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
  17 * (b) that interact with a Xilinx device through a bus or interconnect.
  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,
  21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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  23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  24 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  25 * SOFTWARE.
  26 *
  27 * Except as contained in this notice, the name of the Xilinx shall not be used
  28 * in advertising or otherwise to promote the sale, use or other dealings in
  29 * this Software without prior written authorization from Xilinx.
  30 *
  31 ******************************************************************************/
  32 /****************************************************************************/
  33 /**
  34 *
  35 * @file xwdtps_selftest.c
  36 *
  37 * Contains diagnostic self-test functions for the XWdtPs driver.
  38 *
  39 * <pre>
  40 * MODIFICATION HISTORY:
  41 *
  42 * Ver   Who    Date     Changes
  43 * ----- ------ -------- --------------------------------------------
  44 * 1.00a ecm/jz 01/15/10 First release
  45 * 1.02a sg     08/01/12 Modified it use the Reset Length mask for the self
  46 *                       test for CR 658287
  47 * 3.00  kvn    02/13/15 Modified code for MISRA-C:2012 compliance.
  48 * </pre>
  49 *
  50 ******************************************************************************/
  51
  52 /***************************** Include Files *********************************/
  53
  54 #include "xil_types.h"
  55 #include "xil_assert.h"
  56 #include "xwdtps.h"
  57
  58 /************************** Constant Definitions *****************************/
  59
  60
  61 /**************************** Type Definitions *******************************/
  62
  63
  64 /***************** Macros (Inline Functions) Definitions *********************/
  65
  66
  67 /************************** Function Prototypes ******************************/
  68
  69
  70 /************************** Variable Definitions *****************************/
  71
  72
  73 /****************************************************************************/
  74 /**
  75 *
  76 * Run a self-test on the timebase. This test verifies that the register access
  77 * locking functions. This is tested by trying to alter a register without
  78 * setting the key value and verifying that the register contents did not
  79 * change.
  80 *
  81 * @param        InstancePtr is a pointer to the XWdtPs instance.
  82 *
  83 * @return
  84 *               - XST_SUCCESS if self-test was successful.
  85 *               - XST_FAILURE if self-test was not successful.
  86 *
  87 * @note         None.
  88 *
  89 ******************************************************************************/
  90 s32 XWdtPs_SelfTest(XWdtPs *InstancePtr)
  91 {
  92         u32 ZmrOrig;
  93         u32 ZmrValue1;
  94         u32 ZmrValue2;
  95         s32 Status;
  96
  97         /*
  98          * Assert to ensure the inputs are valid and the instance has been
  99          * initialized.
 100          */
 101         Xil_AssertNonvoid(InstancePtr != NULL);
 102         Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
 103
 104         /*
 105          * Read the ZMR register at start the test.
 106          */
 107         ZmrOrig = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
 108                                  XWDTPS_ZMR_OFFSET);
 109
 110         /*
 111          * EX-OR in the length of the interrupt pulse,
 112          * do not set the key value.
 113          */
 114         ZmrValue1 = ZmrOrig ^ (u32)XWDTPS_ZMR_RSTLN_MASK;
 115
 116
 117         /*
 118          * Try to write to register w/o key value then read back.
 119          */
 120         XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
 121                           ZmrValue1);
 122
 123         ZmrValue2 =     XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
 124                                  XWDTPS_ZMR_OFFSET);
 125
 126         if (ZmrValue1 == ZmrValue2) {
 127                 /*
 128                  * If the values match, the hw failed the test,
 129                  * return orig register value.
 130                  */
 131                 XWdtPs_WriteReg(InstancePtr->Config.BaseAddress,
 132                                   XWDTPS_ZMR_OFFSET,
 133                                   (ZmrOrig | (u32)XWDTPS_ZMR_ZKEY_VAL));
 134                 Status = XST_FAILURE;
 135         } else {
 136
 137
 138                 /*
 139                  * Try to write to register with key value then read back.
 140                  */
 141                 XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
 142                                   (ZmrValue1 | XWDTPS_ZMR_ZKEY_VAL));
 143
 144                 ZmrValue2 =     XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
 145                                          XWDTPS_ZMR_OFFSET);
 146
 147                 if (ZmrValue1 != ZmrValue2) {
 148                         /*
 149                          * If the values do not match, the hw failed the test,
 150                          * return orig register value.
 151                          */
 152                         XWdtPs_WriteReg(InstancePtr->Config.BaseAddress,
 153                                           XWDTPS_ZMR_OFFSET,
 154                                           ZmrOrig | XWDTPS_ZMR_ZKEY_VAL);
 155                         Status = XST_FAILURE;
 156
 157                 } else {
 158
 159                         /*
 160                          * The hardware locking feature is functional, return the original value
 161                          * and return success.
 162                          */
 163                         XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
 164                                           ZmrOrig | XWDTPS_ZMR_ZKEY_VAL);
 165
 166                         Status = XST_SUCCESS;
 167                 }
 168         }
 169         return Status;
 170 }