1/*
 2 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
 3 *
 4 *  This program is free software; you can redistribute it and/or modify it
 5 *  under  the terms of the GNU General	 Public License as published by the
 6 *  Free Software Foundation;  either version 2 of the License, or (at your
 7 *  option) any later version.
 8 *
 9 *  You should have received a copy of the GNU General Public License along
10 *  with this program; if not, write to the Free Software Foundation, Inc.,
11 *  675 Mass Ave, Cambridge, MA 02139, USA.
12 *
13 */
14
15#include <linux/clk.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/pm.h>
19
20#include <asm/reboot.h>
21
22#include <asm/mach-jz4740/base.h>
23#include <asm/mach-jz4740/timer.h>
24
25#include "reset.h"
26#include "clock.h"
27
28static void jz4740_halt(void)
29{
30	while (1) {
31		__asm__(".set push;\n"
32			".set mips3;\n"
33			"wait;\n"
34			".set pop;\n"
35		);
36	}
37}
38
39#define JZ_REG_WDT_DATA 0x00
40#define JZ_REG_WDT_COUNTER_ENABLE 0x04
41#define JZ_REG_WDT_COUNTER 0x08
42#define JZ_REG_WDT_CTRL 0x0c
43
44static void jz4740_restart(char *command)
45{
46	void __iomem *wdt_base = ioremap(JZ4740_WDT_BASE_ADDR, 0x0f);
47
48	jz4740_timer_enable_watchdog();
49
50	writeb(0, wdt_base + JZ_REG_WDT_COUNTER_ENABLE);
51
52	writew(0, wdt_base + JZ_REG_WDT_COUNTER);
53	writew(0, wdt_base + JZ_REG_WDT_DATA);
54	writew(BIT(2), wdt_base + JZ_REG_WDT_CTRL);
55
56	writeb(1, wdt_base + JZ_REG_WDT_COUNTER_ENABLE);
57	jz4740_halt();
58}
59
60void jz4740_reset_init(void)
61{
62	_machine_restart = jz4740_restart;
63	_machine_halt = jz4740_halt;
64}