My goal is to disable the watchdog in kernel.

The board is db120,the setup file is arch/mips/ath79/mach-db120.c

I found that there is ath79_wdt_drievr in my kernel,the file is drivers/watchdog/ath79_wdt.c
   the key function is ath79_wdt_disable() or ath79_wdt_shutdown()...

But I don't know how to use the API, is there anyone can give me instructions ?

I tried my best to write a watchdog_disable() in "arch/mips/ath79/mach-db120.c" ,and call it in db120_setup() but it don't works.
static void watchdog_disable(void)
{
    /*variable definition*/
    volatile unsigned int *wdt_control_regaddr = NULL;
    volatile unsigned int *wdt_timer_regaddr = NULL;
       
    /*register virtual address mapping*/
    wdt_control_regaddr = ioremap(0x18060008, sizeof(unsigned int));
    wdt_timer_regaddr = ioremap(0x1806000C, sizeof(unsigned int));

   
    /*set control according to the datasheet, set [1:0] to 0x00 , no action when timeout*/
    *wdt_control_regaddr &= ~(1 << 0);
    *wdt_control_regaddr &= ~(1 << 1);

    printk(KERN_INFO"control register:%08x\n",*wdt_control_regaddr); //it pitintked 00000000
    printk(KERN_INFO"control register:%08x\n",*wdt_timer_regaddr);//it pitintked 00000000 either,  why?????

    /*iounmap*/
    iounmap((volatile void*)wdt_control_regaddr);
    iounmap((volatile void*)wdt_timer_regaddr);
   
}

(Last edited by banglang.huang on 19 Feb 2013, 04:50)