aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/ti81xx-restart.c
blob: 6c3ce7c46dddf7f0cc43fa15e609822649b260c7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
/*
 * 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/init.h>
#include <linux/reboot.h>

#include "iomap.h"
#include "common.h"
#include "control.h"
#include "prm3xxx.h"

#define TI81XX_PRM_DEVICE_RSTCTRL	0x00a0
#define TI81XX_GLOBAL_RST_COLD		BIT(1)

/**
 * ti81xx_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.
 *
 * NOTE: Warm reset does not seem to work, may require resetting
 * clocks to bypass mode.
 */
void ti81xx_restart(enum reboot_mode mode, const char *cmd)
{
	omap2_prm_set_mod_reg_bits(TI81XX_GLOBAL_RST_COLD, 0,
				   TI81XX_PRM_DEVICE_RSTCTRL);
	while (1);
}