xref: /openbmc/linux/arch/arm/mach-omap2/am33xx-restart.c (revision 7b6d864b48d95e6ea1df7df64475b9cb9616dcf9)

/*
 * am33xx-restart.c - Code common to all AM33xx machines.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/reboot.h>

#include "common.h"
#include "prm-regbits-33xx.h"
#include "prm33xx.h"

/**
 * am3xx_restart - trigger a software restart of the SoC
 * @mode: the "reboot mode", see arch/arm/kernel/{setup,process}.c
 * @cmd: passed from the userspace program rebooting the system (if provided)
 *
 * Resets the SoC.  For @cmd, see the 'reboot' syscall in
 * kernel/sys.c.  No return value.
 */
void am33xx_restart(enum reboot_mode mode, const char *cmd)
{
	/* TODO: Handle mode and cmd if necessary */

	am33xx_prm_rmw_reg_bits(AM33XX_GLOBAL_WARM_SW_RST_MASK,
				AM33XX_GLOBAL_WARM_SW_RST_MASK,
				AM33XX_PRM_DEVICE_MOD,
				AM33XX_PRM_RSTCTRL_OFFSET);

	/* OCP barrier */
	(void)am33xx_prm_read_reg(AM33XX_PRM_DEVICE_MOD,
				  AM33XX_PRM_RSTCTRL_OFFSET);
}