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31 ******************************************************************************/
32 /*****************************************************************************/
36 * This file contains low level functions to get/set time from the Global Timer
37 * register in the ARM Cortex A53 MP core.
40 * MODIFICATION HISTORY:
42 * Ver Who Date Changes
43 * ----- ------ -------- ---------------------------------------------------
44 * 5.00 pkp 05/29/14 First release
45 * 5.05 pkp 04/13/16 Added XTime_StartTimer API to start the global timer
46 * counter if it is disabled. Also XTime_GetTime calls
47 * this API to ensure the global timer counter is enabled
48 * 6.02 pkp 01/22/17 Added support for EL1 non-secure
53 ******************************************************************************/
54 /***************************** Include Files *********************************/
57 #include "xpseudo_asm.h"
58 #include "xil_types.h"
59 #include "xil_assert.h"
61 #include "bspconfig.h"
63 /***************** Macros (Inline Functions) Definitions *********************/
65 /**************************** Type Definitions *******************************/
67 /************************** Constant Definitions *****************************/
69 /************************** Variable Definitions *****************************/
71 /************************** Function Prototypes ******************************/
73 /****************************************************************************/
75 * @brief Start the 64-bit physical timer counter.
81 * @note The timer is initialized only if it is disabled. If the timer is
82 * already running this function does not perform any operation. This
83 * API is effective only if BSP is built for EL3. For EL1 Non-secure,
86 ****************************************************************************/
87 void XTime_StartTimer(void)
90 /* Enable the global timer counter only if it is disabled */
91 if(((Xil_In32(XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_CNT_CNTRL_REG_OFFSET))
92 & XIOU_SCNTRS_CNT_CNTRL_REG_EN_MASK) !=
93 XIOU_SCNTRS_CNT_CNTRL_REG_EN){
94 /*write frequency to System Time Stamp Generator Register*/
95 Xil_Out32((XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_FREQ_REG_OFFSET),
97 /*Enable the timer/counter*/
98 Xil_Out32((XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_CNT_CNTRL_REG_OFFSET)
99 ,XIOU_SCNTRS_CNT_CNTRL_REG_EN);
103 /****************************************************************************/
105 * @brief Timer of A53 runs continuously and the time can not be set as
106 * desired. This API doesn't contain anything. It is defined to have
107 * uniformity across platforms.
109 * @param Xtime_Global: 64bit value to be written to the physical timer
110 * counter register. Since API does not do anything, the value is
117 ****************************************************************************/
118 void XTime_SetTime(XTime Xtime_Global)
121 /*As the generic timer of A53 runs constantly time can not be set as desired
122 so the API is left unimplemented*/
125 /****************************************************************************/
127 * @brief Get the time from the physical timer counter register.
129 * @param Xtime_Global: Pointer to the 64-bit location to be updated with the
130 * current value of physical timer counter register.
136 ****************************************************************************/
137 void XTime_GetTime(XTime *Xtime_Global)
140 /* Start global timer counter, it will only be enabled if it is disabled */
143 *Xtime_Global = mfcp(CNTPCT_EL0);