1 /* 2 * watchdog.c - driver for i.mx on-chip watchdog 3 * 4 * Licensed under the GPL-2 or later. 5 */ 6 7 #include <common.h> 8 #include <asm/io.h> 9 #include <watchdog.h> 10 #include <asm/arch/imx-regs.h> 11 #include <fsl_wdog.h> 12 13 #ifdef CONFIG_IMX_WATCHDOG 14 void hw_watchdog_reset(void) 15 { 16 struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; 17 18 writew(0x5555, &wdog->wsr); 19 writew(0xaaaa, &wdog->wsr); 20 } 21 22 void hw_watchdog_init(void) 23 { 24 struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; 25 u16 timeout; 26 27 /* 28 * The timer watchdog can be set between 29 * 0.5 and 128 Seconds. If not defined 30 * in configuration file, sets 128 Seconds 31 */ 32 #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS 33 #define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000 34 #endif 35 timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1; 36 writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS | 37 SET_WCR_WT(timeout), &wdog->wcr); 38 hw_watchdog_reset(); 39 } 40 #endif 41 42 void reset_cpu(ulong addr) 43 { 44 struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; 45 46 clrsetbits_le16(&wdog->wcr, WCR_WT_MSK, WCR_WDE); 47 48 writew(0x5555, &wdog->wsr); 49 writew(0xaaaa, &wdog->wsr); /* load minimum 1/2 second timeout */ 50 while (1) { 51 /* 52 * spin for .5 seconds before reset 53 */ 54 } 55 } 56