diff options
| author | Stefano Babic <sbabic@denx.de> | 2011-02-02 00:49:36 +0000 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2011-02-25 11:50:47 +0100 |
| commit | 442874388cecc9256e5171c309a2113e16b8e782 (patch) | |
| tree | a6da3ea364f98bdcc5d63488b900616cf8d5662c | |
| parent | 037ee3c4f489a3cb878897ce081eb6c1d45f3802 (diff) | |
MX31: add support for MX31 watchdog
The patch add CONFIG_HW_WATCHDOG to be used
with the internal watchdog timer of the MX31
processor. Two function are exported for the
board maintainers:
mxc_hw_watchdog_enable
mxc_hw_watchdog_reset
The board maintainer can decide to use mxc_hw_watchdog_reset as
hw_watchdog_reset, or to implement his own function to reset
the watchdog.
The watchdog timer can be configured with CONFIG_SYS_WD_TIMER_SECS
(value in seconds). The MX31 allows values between 0.5
(CONFIG_SYS_WD_TIMER_SECS = 0) and 128 seconds.
Signed-off-by: Stefano Babic <sbabic@denx.de>
| -rw-r--r-- | arch/arm/cpu/arm1136/mx31/timer.c | 38 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-mx31/mx31-regs.h | 10 |
2 files changed, 47 insertions, 1 deletions
diff --git a/arch/arm/cpu/arm1136/mx31/timer.c b/arch/arm/cpu/arm1136/mx31/timer.c index f6be3b94a..27c340fd9 100644 --- a/arch/arm/cpu/arm1136/mx31/timer.c +++ b/arch/arm/cpu/arm1136/mx31/timer.c @@ -24,6 +24,8 @@ #include <common.h> #include <asm/arch/mx31-regs.h> #include <div64.h> +#include <watchdog.h> +#include <asm/io.h> #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */ @@ -165,5 +167,39 @@ void __udelay (unsigned long usec) void reset_cpu (ulong addr) { - __REG16(WDOG_BASE) = 4; + struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE; + wdog->wcr = WDOG_ENABLE; + while (1) + ; } + +#ifdef CONFIG_HW_WATCHDOG +void mxc_hw_watchdog_enable(void) +{ + struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE; + u16 secs; + + /* + * The timer watchdog can be set between + * 0.5 and 128 Seconds. If not defined + * in configuration file, sets 64 Seconds + */ +#ifdef CONFIG_SYS_WD_TIMER_SECS + secs = (CONFIG_SYS_WD_TIMER_SECS << 1) & 0xFF; + if (!secs) secs = 1; +#else + secs = 64; +#endif + writew(readw(&wdog->wcr) | (secs << WDOG_WT_SHIFT) | WDOG_ENABLE, + &wdog->wcr); +} + + +void mxc_hw_watchdog_reset(void) +{ + struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE; + + writew(0x5555, &wdog->wsr); + writew(0xAAAA, &wdog->wsr); +} +#endif diff --git a/arch/arm/include/asm/arch-mx31/mx31-regs.h b/arch/arm/include/asm/arch-mx31/mx31-regs.h index 105f7d8be..37337f287 100644 --- a/arch/arm/include/asm/arch-mx31/mx31-regs.h +++ b/arch/arm/include/asm/arch-mx31/mx31-regs.h @@ -75,6 +75,16 @@ struct cspi_regs { u32 test; }; +/* Watchdog Timer (WDOG) registers */ +#define WDOG_ENABLE (1 << 2) +#define WDOG_WT_SHIFT 8 +struct wdog_regs { + u16 wcr; /* Control */ + u16 wsr; /* Service */ + u16 wrsr; /* Reset Status */ +}; + + #define IOMUX_PADNUM_MASK 0x1ff #define IOMUX_PIN(gpionum, padnum) ((padnum) & IOMUX_PADNUM_MASK) |