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author | Ben Dooks <ben-linux@fluff.org> | 2009-05-17 23:30:45 +0100 |
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committer | Ben Dooks <ben-linux@fluff.org> | 2009-05-17 23:30:45 +0100 |
commit | 3cba5ef862bc2c2a0cf2841d993bfb99b9a6c476 (patch) | |
tree | 97000464c961fca757c2131d53680ebed2997e10 /arch/arm/plat-s3c/include | |
parent | 3f7ea467be1bad860c0f71ba7373dd3cf76b485a (diff) | |
download | linux-rt-3cba5ef862bc2c2a0cf2841d993bfb99b9a6c476.tar.gz |
[ARM] S3C: Move watchdog system reset to own file.
Move the watchdog reset code from <mach/system-reset.h> to
a new file <plat/watchdog-reset.h> as this code is needed
by both s3c2410, s3c64xx and soon-to-be added s3c24a0.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-s3c/include')
-rw-r--r-- | arch/arm/plat-s3c/include/plat/watchdog-reset.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c/include/plat/watchdog-reset.h b/arch/arm/plat-s3c/include/plat/watchdog-reset.h new file mode 100644 index 000000000000..277506aa0d51 --- /dev/null +++ b/arch/arm/plat-s3c/include/plat/watchdog-reset.h @@ -0,0 +1,48 @@ +/* arch/arm/plat-s3c/include/plat/watchdog-reset.h + * + * Copyright (c) 2008 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * S3C2410 - System define for arch_reset() function + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include <plat/regs-watchdog.h> + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> + +static inline void arch_wdt_reset(void) +{ + struct clk *wdtclk; + + printk("arch_reset: attempting watchdog reset\n"); + + __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ + + wdtclk = clk_get(NULL, "watchdog"); + if (!IS_ERR(wdtclk)) { + clk_enable(wdtclk); + } else + printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__); + + /* put initial values into count and data */ + __raw_writel(0x80, S3C2410_WTCNT); + __raw_writel(0x80, S3C2410_WTDAT); + + /* set the watchdog to go and reset... */ + __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | + S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON); + + /* wait for reset to assert... */ + mdelay(500); + + printk(KERN_ERR "Watchdog reset failed to assert reset\n"); + + /* delay to allow the serial port to show the message */ + mdelay(50); +} |