| /* |
| * Copyright (C) 1999 ARM Limited |
| * Copyright (C) 2000 Deep Blue Solutions Ltd |
| * Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved. |
| * Copyright 2008 Juergen Beisert, kernel@pengutronix.de |
| * Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/clk.h> |
| #include <linux/io.h> |
| #include <linux/err.h> |
| #include <linux/delay.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| |
| #include <asm/system_misc.h> |
| #include <asm/proc-fns.h> |
| #include <asm/mach-types.h> |
| |
| #include "common.h" |
| #include "hardware.h" |
| |
| static void __iomem *wdog_base; |
| static struct clk *wdog_clk; |
| |
| /* |
| * Reset the system. It is called by machine_restart(). |
| */ |
| void mxc_restart(char mode, const char *cmd) |
| { |
| unsigned int wcr_enable; |
| |
| if (wdog_clk) |
| clk_enable(wdog_clk); |
| |
| if (cpu_is_mx1()) |
| wcr_enable = (1 << 0); |
| else |
| wcr_enable = (1 << 2); |
| |
| /* Assert SRS signal */ |
| __raw_writew(wcr_enable, wdog_base); |
| |
| /* wait for reset to assert... */ |
| mdelay(500); |
| |
| pr_err("%s: Watchdog reset failed to assert reset\n", __func__); |
| |
| /* delay to allow the serial port to show the message */ |
| mdelay(50); |
| |
| /* we'll take a jump through zero as a poor second */ |
| soft_restart(0); |
| } |
| |
| void __init mxc_arch_reset_init(void __iomem *base) |
| { |
| wdog_base = base; |
| |
| wdog_clk = clk_get_sys("imx2-wdt.0", NULL); |
| if (IS_ERR(wdog_clk)) { |
| pr_warn("%s: failed to get wdog clock\n", __func__); |
| wdog_clk = NULL; |
| return; |
| } |
| |
| clk_prepare(wdog_clk); |
| } |
| |
| void __init mxc_arch_reset_init_dt(void) |
| { |
| struct device_node *np; |
| |
| np = of_find_compatible_node(NULL, NULL, "fsl,imx21-wdt"); |
| wdog_base = of_iomap(np, 0); |
| WARN_ON(!wdog_base); |
| |
| wdog_clk = of_clk_get(np, 0); |
| if (IS_ERR(wdog_clk)) { |
| pr_warn("%s: failed to get wdog clock\n", __func__); |
| wdog_clk = NULL; |
| return; |
| } |
| |
| clk_prepare(wdog_clk); |
| } |