xref: /kernel/linux/linux-5.10/arch/mips/lantiq/falcon/reset.c (revision 8c2ecf20)

// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
 * Copyright (C) 2012 John Crispin <john@phrozen.org>
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/pm.h>
#include <asm/reboot.h>
#include <linux/export.h>

#include <lantiq_soc.h>

/*
 * Dummy implementation.  Used to allow platform code to find out what
 * source was booted from
 */
unsigned char ltq_boot_select(void)
{
	return BS_SPI;
}

#define BOOT_REG_BASE	(KSEG1 | 0x1F200000)
#define BOOT_PW1_REG	(BOOT_REG_BASE | 0x20)
#define BOOT_PW2_REG	(BOOT_REG_BASE | 0x24)
#define BOOT_PW1	0x4C545100
#define BOOT_PW2	0x0051544C

#define WDT_REG_BASE	(KSEG1 | 0x1F8803F0)
#define WDT_PW1		0x00BE0000
#define WDT_PW2		0x00DC0000

static void machine_restart(char *command)
{
	local_irq_disable();

	/* reboot magic */
	ltq_w32(BOOT_PW1, (void *)BOOT_PW1_REG); /* 'LTQ\0' */
	ltq_w32(BOOT_PW2, (void *)BOOT_PW2_REG); /* '\0QTL' */
	ltq_w32(0, (void *)BOOT_REG_BASE); /* reset Bootreg RVEC */

	/* watchdog magic */
	ltq_w32(WDT_PW1, (void *)WDT_REG_BASE);
	ltq_w32(WDT_PW2 |
		(0x3 << 26) | /* PWL */
		(0x2 << 24) | /* CLKDIV */
		(0x1 << 31) | /* enable */
		(1), /* reload */
		(void *)WDT_REG_BASE);
	unreachable();
}

static void machine_halt(void)
{
	local_irq_disable();
	unreachable();
}

static void machine_power_off(void)
{
	local_irq_disable();
	unreachable();
}

static int __init mips_reboot_setup(void)
{
	_machine_restart = machine_restart;
	_machine_halt = machine_halt;
	pm_power_off = machine_power_off;
	return 0;
}

arch_initcall(mips_reboot_setup);