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authorGabor Juhos <juhosg@openwrt.org>2011-04-07 20:53:10 +0000
committerGabor Juhos <juhosg@openwrt.org>2011-04-07 20:53:10 +0000
commit2b064bb398c9349a119eedfcd80a1fd6c034f42d (patch)
tree730ae41b64173ce1aca58ef48c1d805e150d4145 /target
parente4555809c7662032842e1b70ece2e4de49bd0f2a (diff)
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ar71xx: add support for the watchdog of the AR934x SoCs
Signed-off-by: Jaiganesh Narayanan <jnarayanan@atheros.com> SVN-Revision: 26516
Diffstat (limited to 'target')
-rw-r--r--target/linux/ar71xx/files/drivers/watchdog/ar71xx_wdt.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/target/linux/ar71xx/files/drivers/watchdog/ar71xx_wdt.c b/target/linux/ar71xx/files/drivers/watchdog/ar71xx_wdt.c
index abe157c..7163465 100644
--- a/target/linux/ar71xx/files/drivers/watchdog/ar71xx_wdt.c
+++ b/target/linux/ar71xx/files/drivers/watchdog/ar71xx_wdt.c
@@ -1,9 +1,12 @@
/*
* Driver for the Atheros AR71xx SoC's built-in hardware watchdog timer.
*
+ * Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
* Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
*
+ * Parts of this file are based on Atheros 2.6.31 BSP
+ *
* This driver was based on: drivers/watchdog/ixp4xx_wdt.c
* Author: Deepak Saxena <dsaxena@plexity.net>
* Copyright 2004 (c) MontaVista, Software, Inc.
@@ -28,6 +31,7 @@
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/watchdog.h>
+#include <linux/delay.h>
#include <asm/mach-ar71xx/ar71xx.h>
@@ -53,16 +57,18 @@ static unsigned long wdt_flags;
static int wdt_timeout = WDT_TIMEOUT;
static int boot_status;
static int max_timeout;
+static u32 wdt_clk_freq;
static inline void ar71xx_wdt_keepalive(void)
{
- ar71xx_reset_wr(AR71XX_RESET_REG_WDOG, ar71xx_ahb_freq * wdt_timeout);
+ ar71xx_reset_wr(AR71XX_RESET_REG_WDOG, wdt_clk_freq * wdt_timeout);
}
static inline void ar71xx_wdt_enable(void)
{
printk(KERN_DEBUG DRV_NAME ": enabling watchdog timer\n");
ar71xx_wdt_keepalive();
+ udelay(2);
ar71xx_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_FCR);
}
@@ -212,7 +218,19 @@ static int __devinit ar71xx_wdt_probe(struct platform_device *pdev)
{
int ret;
- max_timeout = (0xfffffffful / ar71xx_ahb_freq);
+ switch (ar71xx_soc) {
+ case AR71XX_SOC_AR9341:
+ case AR71XX_SOC_AR9342:
+ case AR71XX_SOC_AR9344:
+ wdt_clk_freq = ar934x_ref_freq;
+ break;
+
+ default:
+ wdt_clk_freq = ar71xx_ahb_freq;
+ break;
+ }
+
+ max_timeout = (0xfffffffful / wdt_clk_freq);
wdt_timeout = (max_timeout < WDT_TIMEOUT) ? max_timeout : WDT_TIMEOUT;
if (ar71xx_reset_rr(AR71XX_RESET_REG_WDOG_CTRL) & WDOG_CTRL_LAST_RESET)