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