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/**
* @file xtime_l.c
*
* This file contains low level functions to get/set time from the Global Timer
* register in the ARM Cortex A53 MP core.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who    Date     Changes
* ----- ------ -------- ---------------------------------------------------
* 5.00 	pkp	   05/29/14 First release
* 5.05	pkp	   04/13/16 Added XTime_StartTimer API to start the global timer
*						counter if it is disabled. Also XTime_GetTime calls
*						this API to ensure the global timer counter is enabled
* </pre>
*
* @note		None.
*
******************************************************************************/
/***************************** Include Files *********************************/

#include "xtime_l.h"
#include "xpseudo_asm.h"
#include "xil_types.h"
#include "xil_assert.h"
#include "xil_io.h"
#include "bspconfig.h"

/***************** Macros (Inline Functions) Definitions *********************/

/**************************** Type Definitions *******************************/

/************************** Constant Definitions *****************************/

/************************** Variable Definitions *****************************/

/************************** Function Prototypes ******************************/

/****************************************************************************
*
* Start the Global Timer Counter.
*
* @param	None.
*
* @return	None.
*
* @note		None.
*
****************************************************************************/
void XTime_StartTimer(void)
{
	/* Enable the global timer counter only if it is disabled */
	if(((Xil_In32(XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_CNT_CNTRL_REG_OFFSET))
				& XIOU_SCNTRS_CNT_CNTRL_REG_EN_MASK) !=
				XIOU_SCNTRS_CNT_CNTRL_REG_EN){
		/*write frequency to System Time Stamp Generator Register*/
		Xil_Out32((XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_FREQ_REG_OFFSET),
				XIOU_SCNTRS_FREQ);
		/*Enable the timer/counter*/
		Xil_Out32((XIOU_SCNTRS_BASEADDR + XIOU_SCNTRS_CNT_CNTRL_REG_OFFSET),
					XIOU_SCNTRS_CNT_CNTRL_REG_EN);
	}
}
/****************************************************************************
*
* Set the time in the Global Timer Counter Register.
*
* @param	Value to be written to the Global Timer Counter Register.
*
* @return	None.
*
* @note		In multiprocessor environment reference time will reset/lost for
*		all processors, when this function called by any one processor.
*
****************************************************************************/
void XTime_SetTime(XTime Xtime_Global)
{
/*As the generic timer of A53 runs constantly time can not be set as desired
so the API is left unimplemented*/
}

/****************************************************************************
*
* Get the time from the Global Timer Counter Register.
*
* @param	Pointer to the location to be updated with the time.
*
* @return	None.
*
* @note		None.
*
****************************************************************************/
void XTime_GetTime(XTime *Xtime_Global)
{
	/* Start global timer counter, it will only be enabled if it is disabled */
	XTime_StartTimer();

	*Xtime_Global = mfcp(CNTPCT_EL0);
}