[u-boot.git] / lib_ppc / ticks.S

/*
 * (C) Copyright 2000, 2001
 * Erik Theisen, Wave 7 Optics, [email protected].
 *  base on code by
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#include <config.h>
#include <watchdog.h>

/*
 * unsigned long long get_ticks(void);
 *
 * read timebase as "long long"
 */
	.globl	get_ticks
get_ticks:
1:	mftbu	r3
	mftb	r4
	mftbu	r5
	cmp	0,r3,r5
	bne	1b
	blr

/*
 * Delay for a number of ticks
 */
	.globl	wait_ticks
wait_ticks:
	mflr	r8		/* save link register */
	mr	r7, r3		/* save tick count */
	bl	get_ticks	/* Get start time */

	/* Calculate end time */
	addc    r7, r4, r7	/* Compute end time lower */
	addze	r6, r3		/*     and end time upper */

	WATCHDOG_RESET		/* Trigger watchdog, if needed */
1:	bl	get_ticks	/* Get current time */
	subfc	r4, r4, r7	/* Subtract current time from end time */
	subfe.	r3, r3, r6
	bge	1b		/* Loop until time expired */

	mtlr	r8		/* restore link register */
	blr
Commit	Line	Data
12e4407c WD	1	/*
	2	* (C) Copyright 2000, 2001
	3	* Erik Theisen, Wave 7 Optics, [email protected].
	4	* base on code by
	5	* Wolfgang Denk, DENX Software Engineering, [email protected].
	6	*
	7	* See file CREDITS for list of people who contributed to this
	8	* project.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of
	13	* the License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	23	* MA 02111-1307 USA
	24	*/
	25
	26	#include <ppc_asm.tmpl>
	27	#include <ppc_defs.h>
	28	#include <config.h>
	29	#include <watchdog.h>
	30
	31	/*
	32	* unsigned long long get_ticks(void);
	33	*
	34	* read timebase as "long long"
	35	*/
	36	.globl get_ticks
	37	get_ticks:
	38	1: mftbu r3
	39	mftb r4
	40	mftbu r5
	41	cmp 0,r3,r5
	42	bne 1b
	43	blr
	44
	45	/*
	46	* Delay for a number of ticks
	47	*/
	48	.globl wait_ticks
	49	wait_ticks:
	50	mflr r8 /* save link register */
	51	mr r7, r3 /* save tick count */
	52	bl get_ticks /* Get start time */
	53
	54	/* Calculate end time */
	55	addc r7, r4, r7 /* Compute end time lower */
	56	addze r6, r3 /* and end time upper */
	57
	58	WATCHDOG_RESET /* Trigger watchdog, if needed */
	59	1: bl get_ticks /* Get current time */
	60	subfc r4, r4, r7 /* Subtract current time from end time */
	61	subfe. r3, r3, r6
	62	bge 1b /* Loop until time expired */
	63
	64	mtlr r8 /* restore link register */
65	blr