2 * Copyright (C) 1999 ARM Limited
3 * Copyright (C) 2000 Deep Blue Solutions Ltd
4 * Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
5 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
6 * Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include <linux/kernel.h>
20 #include <linux/clk.h>
22 #include <linux/err.h>
23 #include <linux/delay.h>
25 #include <linux/of_address.h>
27 #include <asm/system_misc.h>
28 #include <asm/proc-fns.h>
29 #include <asm/mach-types.h>
34 static void __iomem *wdog_base;
35 static struct clk *wdog_clk;
38 * Reset the system. It is called by machine_restart().
40 void mxc_restart(enum reboot_mode mode, const char *cmd)
42 unsigned int wcr_enable;
48 wcr_enable = (1 << 0);
50 wcr_enable = (1 << 2);
52 /* Assert SRS signal */
53 __raw_writew(wcr_enable, wdog_base);
55 /* wait for reset to assert... */
58 pr_err("%s: Watchdog reset failed to assert reset\n", __func__);
60 /* delay to allow the serial port to show the message */
63 /* we'll take a jump through zero as a poor second */
67 void __init mxc_arch_reset_init(void __iomem *base)
71 wdog_clk = clk_get_sys("imx2-wdt.0", NULL);
72 if (IS_ERR(wdog_clk)) {
73 pr_warn("%s: failed to get wdog clock\n", __func__);
78 clk_prepare(wdog_clk);
81 void __init mxc_arch_reset_init_dt(void)
83 struct device_node *np;
85 np = of_find_compatible_node(NULL, NULL, "fsl,imx21-wdt");
86 wdog_base = of_iomap(np, 0);
89 wdog_clk = of_clk_get(np, 0);
90 if (IS_ERR(wdog_clk)) {
91 pr_warn("%s: failed to get wdog clock\n", __func__);
96 clk_prepare(wdog_clk);