u-boot/drivers/watchdog/mpc8xx_wdt.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2017 CS Systemes d'Information
*/
#include <common.h>
#include <mpc8xx.h>
#include <asm/cpm_8xx.h>
#include <asm/io.h>
void hw_watchdog_reset(void)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
out_be16(&immap->im_siu_conf.sc_swsr, 0x556c); /* write magic1 */
out_be16(&immap->im_siu_conf.sc_swsr, 0xaa39); /* write magic2 */
}