the org. sc520 watchdog driver does not work on soekris net45xx series.
with the org. driver the system is not rebooting as it should, after a
watchdog "ping lost"
the sc520 driver need some other gpio stuff. i found this in some
older mail archive from an older kernel 2.6
Index: linux-2.6.23.16/drivers/char/watchdog/sc520_wdt.c
===================================================================
--- linux-2.6.23.16.orig/drivers/char/watchdog/sc520_wdt.c
+++ linux-2.6.23.16/drivers/char/watchdog/sc520_wdt.c
@@ -104,6 +104,7 @@
*/
#define MMCR_BASE 0xfffef000 /* The default base address */
#define OFFS_WDTMRCTL 0xCB0 /* Watchdog Timer Control Register */
+#define OFFS_GPIO 0xC00
/* WDT Control Register bit definitions */
#define WDT_EXP_SEL_01 0x0001 /* [01] Time-out = 496 us (with 33 Mhz clk). */
@@ -119,6 +120,7 @@
#define WDT_ENB 0x8000 /* [15] Watchdog Timer Enable */
static __u16 __iomem *wdtmrctl;
+static __u16 __iomem *gpio;
static void wdt_timer_ping(unsigned long);
static DEFINE_TIMER(timer, wdt_timer_ping, 0, 0);
@@ -133,6 +135,7 @@
static void wdt_timer_ping(unsigned long data)
{
+ u_int8_t echo_mode;
/* If we got a heartbeat pulse within the WDT_US_INTERVAL
* we agree to ping the WDT
*/
@@ -140,8 +143,13 @@
{
/* Ping the WDT */
spin_lock(&wdt_spinlock);
+ echo_mode = readb(gpio);
+ writeb(echo_mode & 0xFE, gpio);
+
writew(0xAAAA, wdtmrctl);
writew(0x5555, wdtmrctl);
+
+ writeb(echo_mode, gpio);
spin_unlock(&wdt_spinlock);
/* Re-set the timer interval */
@@ -159,10 +167,14 @@
{
__u16 dummy;
unsigned long flags;
+ u_int8_t echo_mode;
/* buy some time (ping) */
spin_lock_irqsave(&wdt_spinlock, flags);
dummy=readw(wdtmrctl); /* ensure write synchronization */
+ echo_mode = readb(gpio);
+ writeb(echo_mode & 0xFE, gpio);
+
writew(0xAAAA, wdtmrctl);
writew(0x5555, wdtmrctl);
/* unlock WDT = make WDT configuration register writable one time */
@@ -170,6 +182,8 @@
writew(0xCCCC, wdtmrctl);
/* write WDT configuration register */
writew(writeval, wdtmrctl);
+
+ writeb(echo_mode, gpio);
spin_unlock_irqrestore(&wdt_spinlock, flags);
}
@@ -392,6 +406,9 @@
WATCHDOG_TIMEOUT);
}
+ gpio = ioremap((unsigned long) (MMCR_BASE + OFFS_GPIO), 1);
+ printk(KERN_INFO PFX "WDT Soekris GPIO fix initialised.\n");
+
wdtmrctl = ioremap((unsigned long)(MMCR_BASE + OFFS_WDTMRCTL), 2);
if (!wdtmrctl) {
printk(KERN_ERR PFX "Unable to remap memory\n");
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