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S5P: support generic watchdog timer

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This patch adds support the generic watchdog timer for s5pc1xx and exynos4

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: HeungJun, Kim <riverful.kim@samsung.com>
This commit is contained in:
Minkyu Kang 2012-01-18 15:55:05 +09:00 committed by Albert ARIBAUD
parent 0e94a7113a
commit 851db35e2d
5 changed files with 124 additions and 1 deletions
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1
arch/arm/cpu/armv7/s5p-common/Makefile
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@ -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)

59
arch/arm/cpu/armv7/s5p-common/wdt.c Normal file
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@ -0,0 +1,59 @@
/*
* Copyright (C) 2012 Samsung Electronics
* Minkyu Kang <mk7.kang@samsung.com>
*
* 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 <common.h>
#include <asm/io.h>
#include <asm/arch/watchdog.h>
#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);
}

6
arch/arm/include/asm/arch-exynos/watchdog.h
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@ -42,12 +42,16 @@
#define WTCON_INT (0x1 << WTCON_INTEN_OFFSET)
#ifndef __ASSEMBLY__
struct exynos4_watchdog {
struct s5p_watchdog {
unsigned int wtcon;
unsigned int wtdat;
unsigned int wtcnt;
unsigned int wtclrint;
};
/* functions */
void wdt_stop(void);
void wdt_start(unsigned int timeout);
#endif /* __ASSEMBLY__ */
#endif

1
arch/arm/include/asm/arch-s5pc1xx/cpu.h
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@ -98,6 +98,7 @@ SAMSUNG_BASE(mmc, MMC_BASE)
SAMSUNG_BASE(sromc, SROMC_BASE)
SAMSUNG_BASE(timer, PWMTIMER_BASE)
SAMSUNG_BASE(uart, UART_BASE)
SAMSUNG_BASE(watchdog, WATCHDOG_BASE)
#endif
#endif /* _S5PC1XX_CPU_H */

58
arch/arm/include/asm/arch-s5pc1xx/watchdog.h Normal file
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@ -0,0 +1,58 @@
/*
* Copyright (C) 2011 Samsung Electronics
* Heungjun Kim <riverful.kim@samsung.com>
* Minkyu Kang <mk7.kang@samsung.com>
*
* 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
*/
#ifndef __ASM_ARM_ARCH_WATCHDOG_H_
#define __ASM_ARM_ARCH_WATCHDOG_H_
#define WTCON_RESET_OFFSET 0
#define WTCON_INTEN_OFFSET 2
#define WTCON_CLKSEL_OFFSET 3
#define WTCON_EN_OFFSET 5
#define WTCON_PRE_OFFSET 8
#define WTCON_CLK_16 0x0
#define WTCON_CLK_32 0x1
#define WTCON_CLK_64 0x2
#define WTCON_CLK_128 0x3
#define WTCON_CLK(x) ((x & 0x3) << WTCON_CLKSEL_OFFSET)
#define WTCON_PRESCALER(x) ((x) << WTCON_PRE_OFFSET)
#define WTCON_EN (0x1 << WTCON_EN_OFFSET)
#define WTCON_RESET (0x1 << WTCON_RESET_OFFSET)
#define WTCON_INT (0x1 << WTCON_INTEN_OFFSET)
#ifndef __ASSEMBLY__
struct s5p_watchdog {
unsigned int wtcon;
unsigned int wtdat;
unsigned int wtcnt;
unsigned int wtclrint;
};
/* functions */
void wdt_stop(void);
void wdt_start(unsigned int timeout);
#endif /* __ASSEMBLY__ */
#endif