register watchdog only if enabled in hardware (#2378)

SVN-Revision: 17125

target/linux/ar7/patches-2.6.27/140-watchdog_bootcr.patch

@@ -0,0 +1,29 @@
+--- a/drivers/watchdog/ar7_wdt.c	2009-01-25 01:17:01.000000000 +1300
++++ b/drivers/watchdog/ar7_wdt.c	2009-01-25 01:19:15.000000000 +1300
+@@ -293,12 +293,26 @@
+ 	.fops		= &ar7_wdt_fops,
+ };
+ 
++#define AR7_WDT_HARDWARE_ENABLE 0x10
++
+ static int __init ar7_wdt_init(void)
+ {
+ 	int rc;
++	u32 *bootcr;
++	u32 bootcr_value;
+ 
+ 	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");

target/linux/ar7/patches-2.6.30/140-watchdog_bootcr.patch

@@ -0,0 +1,31 @@
+--- 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");