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eea643f7 JB |
1 | /* |
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 | |
74bef9a4 | 6 | * Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com |
eea643f7 JB |
7 | * |
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. | |
12 | * | |
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. | |
eea643f7 JB |
17 | */ |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/clk.h> | |
21 | #include <linux/io.h> | |
74bef9a4 IY |
22 | #include <linux/err.h> |
23 | #include <linux/delay.h> | |
807dfe70 | 24 | #include <linux/module.h> |
eea643f7 | 25 | |
a09e64fb | 26 | #include <mach/hardware.h> |
fd6ac7bb | 27 | #include <mach/common.h> |
9f97da78 | 28 | #include <asm/system_misc.h> |
eea643f7 | 29 | #include <asm/proc-fns.h> |
c2932bf4 | 30 | #include <asm/mach-types.h> |
eea643f7 | 31 | |
f548897f | 32 | void __iomem *(*imx_ioremap)(unsigned long, size_t, unsigned int) = NULL; |
807dfe70 | 33 | EXPORT_SYMBOL_GPL(imx_ioremap); |
41e7daf2 | 34 | |
be124c94 | 35 | static void __iomem *wdog_base; |
eea643f7 JB |
36 | |
37 | /* | |
38 | * Reset the system. It is called by machine_restart(). | |
39 | */ | |
65ea7884 | 40 | void mxc_restart(char mode, const char *cmd) |
eea643f7 | 41 | { |
be124c94 SH |
42 | unsigned int wcr_enable; |
43 | ||
44 | if (cpu_is_mx1()) { | |
45 | wcr_enable = (1 << 0); | |
46 | } else { | |
74bef9a4 | 47 | struct clk *clk; |
eea643f7 | 48 | |
2c1f4672 | 49 | clk = clk_get_sys("imx2-wdt.0", NULL); |
74bef9a4 | 50 | if (!IS_ERR(clk)) |
bcab5010 | 51 | clk_prepare_enable(clk); |
be124c94 | 52 | wcr_enable = (1 << 2); |
eea643f7 JB |
53 | } |
54 | ||
eea643f7 | 55 | /* Assert SRS signal */ |
be124c94 | 56 | __raw_writew(wcr_enable, wdog_base); |
74bef9a4 IY |
57 | |
58 | /* wait for reset to assert... */ | |
59 | mdelay(500); | |
60 | ||
61 | printk(KERN_ERR "Watchdog reset failed to assert reset\n"); | |
62 | ||
63 | /* delay to allow the serial port to show the message */ | |
64 | mdelay(50); | |
65 | ||
66 | /* we'll take a jump through zero as a poor second */ | |
e879c862 | 67 | soft_restart(0); |
eea643f7 | 68 | } |
be124c94 SH |
69 | |
70 | void mxc_arch_reset_init(void __iomem *base) | |
71 | { | |
72 | wdog_base = base; | |
73 | } |