[WATCHDOG] rc32434_wdt: add timeout module parameter

[safe/jmp/linux-2.6] / drivers / watchdog / rc32434_wdt.c

diff --git a/drivers/watchdog/rc32434_wdt.c b/drivers/watchdog/rc32434_wdt.c
index 68fb226..89f326a 100644 (file)
--- a/drivers/watchdog/rc32434_wdt.c
+++ b/drivers/watchdog/rc32434_wdt.c
@@ -34,7 +34,7 @@
 
 #define PFX KBUILD_MODNAME ": "
 
-#define VERSION "0.4"
+#define VERSION "0.5"
 
 static struct {
        unsigned long inuse;
@@ -58,6 +58,9 @@ extern unsigned int idt_cpu_freq;
 #define WATCHDOG_TIMEOUT 20
 
 static int timeout = WATCHDOG_TIMEOUT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout value, in seconds (default="
+               WATCHDOG_TIMEOUT ")");
 
 static int nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, int, 0);
@@ -68,6 +71,21 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 #define SET_BITS(addr, or, nand) \
        writel((readl(&addr) | or) & ~nand, &addr)
 
+static int rc32434_wdt_set(int new_timeout)
+{
+       int max_to = WTCOMP2SEC((u32)-1);
+
+       if (new_timeout < 0 || new_timeout > max_to) {
+               printk(KERN_ERR PFX "timeout value must be between 0 and %d",
+                       max_to);
+               return -EINVAL;
+       }
+       timeout = new_timeout;
+       writel(SEC2WTCOMP(timeout), &wdt_reg->wtcompare);
+
+       return 0;
+}
+
 static void rc32434_wdt_start(void)
 {
        u32 or, nand;
@@ -85,6 +103,9 @@ static void rc32434_wdt_start(void)
 
        SET_BITS(wdt_reg->errcs, or, nand);
 
+       /* set the timeout (either default or based on module param) */
+       rc32434_wdt_set(timeout);
+
        /* reset WTC timeout bit and enable WDT */
        nand = 1 << RC32434_WTC_TO;
        or = 1 << RC32434_WTC_EN;
@@ -102,21 +123,6 @@ static void rc32434_wdt_stop(void)
        printk(KERN_INFO PFX "Stopped watchdog timer.\n");
 }
 
-static int rc32434_wdt_set(int new_timeout)
-{
-       int max_to = WTCOMP2SEC((u32)-1);
-
-       if (new_timeout < 0 || new_timeout > max_to) {
-               printk(KERN_ERR PFX "timeout value must be between 0 and %d",
-                       max_to);
-               return -EINVAL;
-       }
-       timeout = new_timeout;
-       writel(SEC2WTCOMP(timeout), &wdt_reg->wtcompare);
-
-       return 0;
-}
-
 static void rc32434_wdt_ping(void)
 {
        writel(0, &wdt_reg->wtcount);
@@ -264,6 +270,15 @@ static int __devinit rc32434_wdt_probe(struct platform_device *pdev)
                return -ENXIO;
        }
 
+       /* Check that the heartbeat value is within it's range;
+        * if not reset to the default */
+       if (rc32434_wdt_set(timeout)) {
+               rc32434_wdt_set(WATCHDOG_TIMEOUT);
+               printk(KERN_INFO PFX
+                       "timeout value must be between 0 and %d\n",
+                       WTCOMP2SEC((u32)-1));
+       }
+
        ret = misc_register(&rc32434_wdt_miscdev);
        if (ret < 0) {
                printk(KERN_ERR PFX "failed to register watchdog device\n");