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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * Watchdog driver for the FTWDT010 Watch Dog Driver
      4  *
      5  * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
      6  * Based on sa1100_wdt.c by Oleg Drokin <green (at) crimea.edu>
      7  * Based on SoftDog driver by Alan Cox <alan (at) redhat.com>
      8  *
      9  * Copyright (C) 2011 Andes Technology Corporation
     10  * Macpaul Lin, Andes Technology Corporation <macpaul (at) andestech.com>
     11  *
     12  * 27/11/2004 Initial release, Faraday.
     13  * 12/01/2011 Port to u-boot, Macpaul Lin.
     14  */
     15 
     16 #include <common.h>
     17 #include <watchdog.h>
     18 #include <asm/io.h>
     19 #include <faraday/ftwdt010_wdt.h>
     20 
     21 /*
     22  * Set the watchdog time interval.
     23  * Counter is 32 bit.
     24  */
     25 int ftwdt010_wdt_settimeout(unsigned int timeout)
     26 {
     27 	unsigned int reg;
     28 
     29 	struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
     30 
     31 	debug("Activating WDT..\n");
     32 
     33 	/* Check if disabled */
     34 	if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
     35 		printf("sorry, watchdog is disabled\n");
     36 		return -1;
     37 	}
     38 
     39 	/*
     40 	 * In a 66MHz system,
     41 	 * if you set WDLOAD as 0x03EF1480 (66000000)
     42 	 * the reset timer is 1 second.
     43 	 */
     44 	reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
     45 
     46 	writel(reg, &wd->wdload);
     47 
     48 	return 0;
     49 }
     50 
     51 void ftwdt010_wdt_reset(void)
     52 {
     53 	struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
     54 
     55 	/* clear control register */
     56 	writel(0, &wd->wdcr);
     57 
     58 	/* Write Magic number */
     59 	writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
     60 
     61 	/* Enable WDT */
     62 	writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
     63 }
     64 
     65 void ftwdt010_wdt_disable(void)
     66 {
     67 	struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
     68 
     69 	debug("Deactivating WDT..\n");
     70 
     71 	/*
     72 	 * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
     73 	 *
     74 	 * Shut off the timer.
     75 	 * Lock it in if it's a module and we defined ...NOWAYOUT
     76 	 */
     77 	writel(0, &wd->wdcr);
     78 }
     79 
     80 #if defined(CONFIG_HW_WATCHDOG)
     81 void hw_watchdog_reset(void)
     82 {
     83 	ftwdt010_wdt_reset();
     84 }
     85 
     86 void hw_watchdog_init(void)
     87 {
     88 	/* set timer in ms */
     89 	ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
     90 }
     91 #endif
     92