blob: b04adefd0f5348b80fb9ce79e645e9df8f496f35 [file] [log] [blame]
/******************************************************************************
*
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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
* 6.02 pkp 01/22/17 Added support for EL1 non-secure
* </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 ******************************/
/****************************************************************************/
/**
* @brief Start the 64-bit physical timer counter.
*
* @param None.
*
* @return None.
*
* @note The timer is initialized only if it is disabled. If the timer is
* already running this function does not perform any operation. This
* API is effective only if BSP is built for EL3. For EL1 Non-secure,
* it simply exits.
*
****************************************************************************/
void XTime_StartTimer(void)
{
if (EL3 == 1){
/* 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);
}
}
}
/****************************************************************************/
/**
* @brief Timer of A53 runs continuously and the time can not be set as
* desired. This API doesn't contain anything. It is defined to have
* uniformity across platforms.
*
* @param Xtime_Global: 64bit value to be written to the physical timer
* counter register. Since API does not do anything, the value is
* not utilized.
*
* @return None.
*
* @note None.
*
****************************************************************************/
void XTime_SetTime(XTime Xtime_Global)
{
(void) Xtime_Global;
/*As the generic timer of A53 runs constantly time can not be set as desired
so the API is left unimplemented*/
}
/****************************************************************************/
/**
* @brief Get the time from the physical timer counter register.
*
* @param Xtime_Global: Pointer to the 64-bit location to be updated with the
* current value of physical timer counter register.
*
* @return None.
*
* @note None.
*
****************************************************************************/
void XTime_GetTime(XTime *Xtime_Global)
{
if (EL3 == 1)
/* Start global timer counter, it will only be enabled if it is disabled */
XTime_StartTimer();
*Xtime_Global = mfcp(CNTPCT_EL0);
}