Initialize by calling the generic API watchdog_enable() with the number of seconds for the watchdog to timeout. It's not possible to disable the watchdog once it's on.
Signed-off-by: Simon Kagstrom simon.kagstrom@netinsight.net --- ChangeLog:
v2: (Some of the comments from Prafulla) * Use readl/writel * Rename WATCHDOG_CNTR -> WATCHDOG_TMR
cpu/arm926ejs/kirkwood/timer.c | 37 +++++++++++++++++++++++++++++++++++++ 1 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/cpu/arm926ejs/kirkwood/timer.c b/cpu/arm926ejs/kirkwood/timer.c index 817ff42..797ab04 100644 --- a/cpu/arm926ejs/kirkwood/timer.c +++ b/cpu/arm926ejs/kirkwood/timer.c @@ -23,8 +23,10 @@
#include <common.h> #include <asm/arch/kirkwood.h> +#include <watchdog.h>
#define UBOOT_CNTR 0 /* counter to use for uboot timer */ +#define WATCHDOG_TMR 2
/* Timer reload and current value registers */ struct kwtmr_val { @@ -166,3 +168,38 @@ int timer_init(void)
return 0; } + +#if defined(CONFIG_HW_WATCHDOG) +static unsigned long watchdog_timeout = 5; +void hw_watchdog_reset(void) +{ + u32 time = CONFIG_SYS_TCLK * watchdog_timeout; + + writel(time, CNTMR_VAL_REG(WATCHDOG_TMR)); +} + +void watchdog_enable(unsigned int timeout_secs) +{ + struct kwcpu_registers *cpureg = + (struct kwcpu_registers *)KW_CPU_REG_BASE; + u32 rstoutn_mask; + u32 cntmrctrl; + + watchdog_timeout = timeout_secs; + /* Enable CPU reset if watchdog expires */ + rstoutn_mask = readl(cpureg->rstoutn_mask); + writel(rstoutn_mask |= WATCHDOG_TMR, &cpureg->rstoutn_mask); + hw_watchdog_reset(); + + /* Enable the watchdog */ + cntmrctrl = readl(CNTMR_CTRL_REG); + cntmrctrl |= CTCR_ARM_TIMER_EN(WATCHDOG_TMR); + cntmrctrl |= CTCR_ARM_TIMER_AUTO_EN(WATCHDOG_TMR); + writel(cntmrctrl, CNTMR_CTRL_REG); +} + +void watchdog_disable(void) +{ + /* Can't be done */ +} +#endif