ti81xx-restart.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2#include <linux/kernel.h>
 3#include <linux/init.h>
 4#include <linux/reboot.h>
 5
 6#include "iomap.h"
 7#include "common.h"
 8#include "control.h"
 9#include "prm3xxx.h"
10
11#define TI81XX_PRM_DEVICE_RSTCTRL	0x00a0
12#define TI81XX_GLOBAL_RST_COLD		BIT(1)
13
14/**
15 * ti81xx_restart - trigger a software restart of the SoC
16 * @mode: the "reboot mode", see arch/arm/kernel/{setup,process}.c
17 * @cmd: passed from the userspace program rebooting the system (if provided)
18 *
19 * Resets the SoC.  For @cmd, see the 'reboot' syscall in
20 * kernel/sys.c.  No return value.
21 *
22 * NOTE: Warm reset does not seem to work, may require resetting
23 * clocks to bypass mode.
24 */
25void ti81xx_restart(enum reboot_mode mode, const char *cmd)
26{
27	omap2_prm_set_mod_reg_bits(TI81XX_GLOBAL_RST_COLD, 0,
28				   TI81XX_PRM_DEVICE_RSTCTRL);
29	while (1)
30		;
31}