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