u-boot/cpu/arm926ejs/davinci/reset.S

/*
 * Processor reset using WDT for TI TMS320DM644x SoC.
 *
 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
 *
 * -----------------------------------------------------
 *
 * 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
 */

.globl reset_cpu
reset_cpu:
	ldr	r0, WDT_TGCR
	mov	r1, $0x08
	str	r1, [r0]
	ldr	r1, [r0]
	orr	r1, r1, $0x03
	str	r1, [r0]
	mov	r1, $0
	ldr	r0, WDT_TIM12
	str	r1, [r0]
	ldr	r0, WDT_TIM34
	str	r1, [r0]
	ldr	r0, WDT_PRD12
	str	r1, [r0]
	ldr	r0, WDT_PRD34
	str	r1, [r0]
	ldr	r0, WDT_TCR
	ldr	r1, [r0]
	orr	r1, r1, $0x40
	str	r1, [r0]
	ldr	r0, WDT_WDTCR
	ldr	r1, [r0]
	orr	r1, r1, $0x4000
	str	r1, [r0]
	ldr	r1, WDTCR_VAL1
	str	r1, [r0]
	ldr	r1, WDTCR_VAL2
	str	r1, [r0]
	/* Write an invalid value to the WDKEY field to trigger
	 * an immediate watchdog reset */
	mov     r1, $0x4000
	str     r1, [r0]
	nop
	nop
	nop
	nop
reset_cpu_loop:
	b	reset_cpu_loop

WDT_TGCR:
	.word	0x01c21c24
WDT_TIM12:
	.word	0x01c21c10
WDT_TIM34:
	.word	0x01c21c14
WDT_PRD12:
	.word	0x01c21c18
WDT_PRD34:
	.word	0x01c21c1c
WDT_TCR:
	.word	0x01c21c20
WDT_WDTCR:
	.word	0x01c21c28
WDTCR_VAL1:
	.word	0xa5c64000
WDTCR_VAL2:
	.word	0xda7e4000