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| author | Chin Liang See <clsee@altera.com> | 2014-06-10 01:10:21 -0500 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2014-07-05 00:24:16 +0200 |
| commit | d8c67dc6e1f861bcf6e61c0b67782fbac2e0a010 (patch) | |
| tree | 78fe2e1133108456374c7e6b4fbd492188827a70 /drivers/watchdog | |
| parent | 7237d22baac9ebeffc946dfd30b9f61aaf0bfdbc (diff) | |
| download | u-boot-imx-d8c67dc6e1f861bcf6e61c0b67782fbac2e0a010.zip u-boot-imx-d8c67dc6e1f861bcf6e61c0b67782fbac2e0a010.tar.gz u-boot-imx-d8c67dc6e1f861bcf6e61c0b67782fbac2e0a010.tar.bz2 | |
watchdog/denali: Adding DesignWare watchdog driver support
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>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/watchdog/designware_wdt.c | 74 |
2 files changed, 75 insertions, 0 deletions
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..e788e1b --- /dev/null +++ b/drivers/watchdog/designware_wdt.c @@ -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 |