blob: 21c95a7652d3e712b4551aa7f38d8f26dc5187a1 (
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--- a/drivers/watchdog/ar7_wdt.c
+++ b/drivers/watchdog/ar7_wdt.c
@@ -298,14 +298,28 @@ static struct miscdevice ar7_wdt_miscdev
.fops = &ar7_wdt_fops,
};
+#define AR7_WDT_HARDWARE_ENABLE 0x10
+
static int __init ar7_wdt_init(void)
{
int rc;
+ u32 *bootcr;
+ u32 bootcr_value;
spin_lock_init(&wdt_lock);
ar7_wdt_get_regs();
+ /* arch/mips/ar7/clocks.c is the only other thing that reads this */
+ bootcr = (u32 *)ioremap_nocache(AR7_REGS_DCL, 4);
+ bootcr_value = *bootcr;
+ iounmap(bootcr);
+
+ if (!(bootcr_value & AR7_WDT_HARDWARE_ENABLE)) {
+ printk(KERN_INFO DRVNAME ": watchdog disabled in hardware (bootcr=%#x)\n", bootcr_value);
+ return -ENODEV;
+ }
+
if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt),
LONGNAME)) {
printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
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