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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
52 ******************************************************************************/
53 /***************************** Include Files *********************************/
56 #include "xpseudo_asm.h"
57 #include "xil_types.h"
58 #include "xil_assert.h"
60 #include "bspconfig.h"
62 /***************** Macros (Inline Functions) Definitions *********************/
64 /**************************** Type Definitions *******************************/
66 /************************** Constant Definitions *****************************/
68 /************************** Variable Definitions *****************************/
70 /************************** Function Prototypes ******************************/
72 /****************************************************************************
74 * Start the Global Timer Counter.
82 ****************************************************************************/
83 void XTime_StartTimer(void)
85 /* Enable the global timer counter only if it is disabled */
86 if(((Xil_In32(XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_CNT_CNTRL_REG_OFFSET))
87 & XIOU_SCNTRS_CNT_CNTRL_REG_EN_MASK) !=
88 XIOU_SCNTRS_CNT_CNTRL_REG_EN){
89 /*write frequency to System Time Stamp Generator Register*/
90 Xil_Out32((XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_FREQ_REG_OFFSET),
92 /*Enable the timer/counter*/
93 Xil_Out32((XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_CNT_CNTRL_REG_OFFSET),
94 XIOU_SCNTRS_CNT_CNTRL_REG_EN);
97 /****************************************************************************
99 * Set the time in the Global Timer Counter Register.
101 * @param Value to be written to the Global Timer Counter Register.
105 * @note In multiprocessor environment reference time will reset/lost for
106 * all processors, when this function called by any one processor.
108 ****************************************************************************/
109 void XTime_SetTime(XTime Xtime_Global)
111 /*As the generic timer of A53 runs constantly time can not be set as desired
112 so the API is left unimplemented*/
115 /****************************************************************************
117 * Get the time from the Global Timer Counter Register.
119 * @param Pointer to the location to be updated with the time.
125 ****************************************************************************/
126 void XTime_GetTime(XTime *Xtime_Global)
128 /* Start global timer counter, it will only be enabled if it is disabled */
131 *Xtime_Global = mfcp(CNTPCT_EL0);