[U-Boot] [PATCH] watchdog/denali: Adding DesignWare watchdog driver support

[Chin Liang See <clsee@altera.com>]

Hi guys,

Wonder any comments for this patch?
Thanks

Chin Liang


On Wed, 2013-12-18 at 16:23 -0600, Chin Liang See wrote:
> 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>
> ---
>  drivers/watchdog/Makefile         |    1 +
>  drivers/watchdog/designware_wdt.c |   75 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 76 insertions(+)
>  create mode 100644 drivers/watchdog/designware_wdt.c
> 
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 06ced10..0276a10 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -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
> diff --git a/drivers/watchdog/designware_wdt.c b/drivers/watchdog/designware_wdt.c
> new file mode 100644
> index 0000000..c3b14f5
> --- /dev/null
> +++ b/drivers/watchdog/designware_wdt.c
> @@ -0,0 +1,75 @@
> +/*
> + * 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.
> + */
> +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;
> +}
> +
> +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));
> +}
> +
> +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