From 851db35e2dc07ca1d0a5c02be2652cf1173652eb Mon Sep 17 00:00:00 2001 From: Minkyu Kang Date: Wed, 18 Jan 2012 15:55:05 +0900 Subject: S5P: support generic watchdog timer This patch adds support the generic watchdog timer for s5pc1xx and exynos4 Signed-off-by: Minkyu Kang Signed-off-by: Kyungmin Park Cc: HeungJun, Kim --- arch/arm/cpu/armv7/s5p-common/Makefile | 1 + arch/arm/cpu/armv7/s5p-common/wdt.c | 59 ++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+) create mode 100644 arch/arm/cpu/armv7/s5p-common/wdt.c (limited to 'arch/arm/cpu/armv7/s5p-common') diff --git a/arch/arm/cpu/armv7/s5p-common/Makefile b/arch/arm/cpu/armv7/s5p-common/Makefile index 17053995bd..f975f3f06c 100644 --- a/arch/arm/cpu/armv7/s5p-common/Makefile +++ b/arch/arm/cpu/armv7/s5p-common/Makefile @@ -28,6 +28,7 @@ LIB = $(obj)libs5p-common.o COBJS-y += cpu_info.o COBJS-y += timer.o COBJS-y += sromc.o +COBJS-y += wdt.o COBJS-$(CONFIG_PWM) += pwm.o SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c) diff --git a/arch/arm/cpu/armv7/s5p-common/wdt.c b/arch/arm/cpu/armv7/s5p-common/wdt.c new file mode 100644 index 0000000000..94acc1e4ba --- /dev/null +++ b/arch/arm/cpu/armv7/s5p-common/wdt.c @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2012 Samsung Electronics + * Minkyu Kang + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include +#include + +#define PRESCALER_VAL 255 + +void wdt_stop(void) +{ + struct s5p_watchdog *wdt = + (struct s5p_watchdog *)samsung_get_base_watchdog(); + unsigned int wtcon; + + wtcon = readl(&wdt->wtcon); + wtcon &= ~(WTCON_EN | WTCON_INT | WTCON_RESET); + + writel(wtcon, &wdt->wtcon); +} + +void wdt_start(unsigned int timeout) +{ + struct s5p_watchdog *wdt = + (struct s5p_watchdog *)samsung_get_base_watchdog(); + unsigned int wtcon; + + wdt_stop(); + + wtcon = readl(&wdt->wtcon); + wtcon |= (WTCON_EN | WTCON_CLK(WTCON_CLK_128)); + wtcon &= ~WTCON_INT; + wtcon |= WTCON_RESET; + wtcon |= WTCON_PRESCALER(PRESCALER_VAL); + + writel(timeout, &wdt->wtdat); + writel(timeout, &wdt->wtcnt); + writel(wtcon, &wdt->wtcon); +} -- cgit v1.2.1