/******************************************************************************
*
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/*****************************************************************************/
/**
*
* @file microblaze_sleep.c
*
* Contains implementation of microblaze sleep function.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date	 Changes
* ----- ---- -------- -------------------------------------------------------
* 4.1   hk   04/18/14 Add sleep function.
*
* </pre>
*
* @note
*
* This file may contain architecture-dependent code.
*
******************************************************************************/

/***************************** Include Files *********************************/

#include "microblaze_sleep.h"

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


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


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


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



/*****************************************************************************/
/**
*
* Provides delay for requested duration.
*
* @param	Delay time in milliseconds.
*
* @return	None.
*
* @note		Instruction cache should be enabled for this to work.
*
******************************************************************************/
void MB_Sleep(unsigned int MilliSeconds)
{
	if (((mfmsr() & 0x20) == 0)) {
		/*
		 * Instruction cache not enabled.
		 * Delay will be much higher than expected.
		 */
	}

	asm volatile ("\n"
			"1:               \n\t"
			"addik r7, r0, %0 \n\t"
			"2:               \n\t"
			"addik r7, r7, -1 \n\t"
			"bneid  r7, 2b    \n\t"
			"or  r0, r0, r0   \n\t"
			"bneid %1, 1b     \n\t"
			"addik %1, %1, -1 \n\t"
			:: "i"(ITERS_PER_MSEC), "d" (MilliSeconds));

}