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
);
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