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watchdog/denali: Adding DesignWare watchdog driver support

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To add the DesignWare watchdog driver support. It required
information such as register base address and clock info from
configuration header file  within include/configs folder.

Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Heiko Schocher <hs@denx.de>
Cc: Tom Rini <trini@ti.com>
This commit is contained in:
Chin Liang See 2014-06-10 01:10:21 -05:00 committed by Albert ARIBAUD
parent 7237d22baa
commit d8c67dc6e1
2 changed files with 75 additions and 0 deletions
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1
drivers/watchdog/Makefile
View file

@ -15,3 +15,4 @@ obj-$(CONFIG_S5P) += s5p_wdt.o
obj-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
obj-$(CONFIG_BFIN_WATCHDOG) += bfin_wdt.o
obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
obj-$(CONFIG_DESIGNWARE_WATCHDOG) += designware_wdt.o

74
drivers/watchdog/designware_wdt.c Normal file
View file

@ -0,0 +1,74 @@
/*
* Copyright (C) 2013 Altera Corporation <www.altera.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <watchdog.h>
#include <asm/io.h>
#include <asm/utils.h>
#define DW_WDT_CR 0x00
#define DW_WDT_TORR 0x04
#define DW_WDT_CRR 0x0C
#define DW_WDT_CR_EN_OFFSET 0x00
#define DW_WDT_CR_RMOD_OFFSET 0x01
#define DW_WDT_CR_RMOD_VAL 0x00
#define DW_WDT_CRR_RESTART_VAL 0x76
/*
* Set the watchdog time interval.
* Counter is 32 bit.
*/
static int designware_wdt_settimeout(unsigned int timeout)
{
signed int i;
/* calculate the timeout range value */
i = (log_2_n_round_up(timeout * CONFIG_DW_WDT_CLOCK_KHZ)) - 16;
if (i > 15)
i = 15;
if (i < 0)
i = 0;
writel((i | (i << 4)), (CONFIG_DW_WDT_BASE + DW_WDT_TORR));
return 0;
}
static void designware_wdt_enable(void)
{
writel(((DW_WDT_CR_RMOD_VAL << DW_WDT_CR_RMOD_OFFSET) |
(0x1 << DW_WDT_CR_EN_OFFSET)),
(CONFIG_DW_WDT_BASE + DW_WDT_CR));
}
static unsigned int designware_wdt_is_enabled(void)
{
unsigned long val;
val = readl((CONFIG_DW_WDT_BASE + DW_WDT_CR));
return val & 0x1;
}
#if defined(CONFIG_HW_WATCHDOG)
void hw_watchdog_reset(void)
{
if (designware_wdt_is_enabled())
/* restart the watchdog counter */
writel(DW_WDT_CRR_RESTART_VAL,
(CONFIG_DW_WDT_BASE + DW_WDT_CRR));
}
void hw_watchdog_init(void)
{
/* reset to disable the watchdog */
hw_watchdog_reset();
/* set timer in miliseconds */
designware_wdt_settimeout(CONFIG_HW_WATCHDOG_TIMEOUT_MS);
/* enable the watchdog */
designware_wdt_enable();
/* reset the watchdog */
hw_watchdog_reset();
}
#endif