/**

 * @file delay.s

 * @brief functions to provide smc interface

 * Copyright (c) 2014 Samsung Electronics Co., Ltd.

 *

 * This software is proprietary of Samsung Electronics.

 * No part of this software, either material or conceptual may be copied

 * or distributed, transmitted, transcribed, stored in a retrieval system

 * or translated into any human or computer language in any form by any means,

 * electronic, mechanical, manual or otherwise, or disclosed to third parties

 * without the express written permission of Samsung Electronics.

 */



#define TIMER_PERIOD	417	/* 41.7 ns * 10 */



	export delay_timer



	area text, code, readonly

	preserve8

	arm

delay_timer

	stmfd	sp!, {r4-r11, lr}

	mov	r4, r0

	mov	r8, #10

	mul	r4, r4, r8

	mov	r9, #TIMER_PERIOD





	mrrc	p15, 0, r5, r6, c14

	cmp	r5, 0

	beq	fail



loop

	mrrc	p15, 0, r7, r8, c14

	sub	r7, r7, r5

	mov r10, r7

	mul	r7, r7, r9

	cmp	r7, r4

	blt	loop

	

	mov	r0, 0

	dsb

	isb

	ldmfd	sp!, {r4-r11, pc}

	bx	lr



fail

	mov	r0, #-1

	dsb

	isb

	ldmfd	sp!, {r4-r11, pc}

	bx	lr



	end