1abbab703STroy Kisky /* 2abbab703STroy Kisky * watchdog.c - driver for i.mx on-chip watchdog 3abbab703STroy Kisky * 4abbab703STroy Kisky * Licensed under the GPL-2 or later. 5abbab703STroy Kisky */ 6abbab703STroy Kisky 7abbab703STroy Kisky #include <common.h> 8abbab703STroy Kisky #include <asm/io.h> 9abbab703STroy Kisky #include <watchdog.h> 10abbab703STroy Kisky #include <asm/arch/imx-regs.h> 11f532727dSFabio Estevam #include <fsl_wdog.h> 12abbab703STroy Kisky 13abbab703STroy Kisky #ifdef CONFIG_IMX_WATCHDOG 14abbab703STroy Kisky void hw_watchdog_reset(void) 15abbab703STroy Kisky { 16abbab703STroy Kisky struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; 17abbab703STroy Kisky 18abbab703STroy Kisky writew(0x5555, &wdog->wsr); 19abbab703STroy Kisky writew(0xaaaa, &wdog->wsr); 20abbab703STroy Kisky } 21abbab703STroy Kisky 22abbab703STroy Kisky void hw_watchdog_init(void) 23abbab703STroy Kisky { 24abbab703STroy Kisky struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; 25abbab703STroy Kisky u16 timeout; 26abbab703STroy Kisky 27abbab703STroy Kisky /* 28abbab703STroy Kisky * The timer watchdog can be set between 29abbab703STroy Kisky * 0.5 and 128 Seconds. If not defined 30abbab703STroy Kisky * in configuration file, sets 128 Seconds 31abbab703STroy Kisky */ 32abbab703STroy Kisky #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS 33abbab703STroy Kisky #define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000 34abbab703STroy Kisky #endif 35abbab703STroy Kisky timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1; 36723ec69aSAnatolij Gustschin writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS | 375cab8740SSebastian Siewior SET_WCR_WT(timeout), &wdog->wcr); 38abbab703STroy Kisky hw_watchdog_reset(); 39abbab703STroy Kisky } 40abbab703STroy Kisky #endif 41abbab703STroy Kisky 42abbab703STroy Kisky void reset_cpu(ulong addr) 43abbab703STroy Kisky { 44abbab703STroy Kisky struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; 45abbab703STroy Kisky 46*587c3f8eSAndrey Skvortsov clrsetbits_le16(&wdog->wcr, WCR_WT_MSK, WCR_WDE); 47623d96e8SPeng Fan 48abbab703STroy Kisky writew(0x5555, &wdog->wsr); 49abbab703STroy Kisky writew(0xaaaa, &wdog->wsr); /* load minimum 1/2 second timeout */ 50abbab703STroy Kisky while (1) { 51abbab703STroy Kisky /* 52abbab703STroy Kisky * spin for .5 seconds before reset 53abbab703STroy Kisky */ 54abbab703STroy Kisky } 55abbab703STroy Kisky } 56