MIPS: Loongson1B: Fix reboot problem on LS1B

- Correct the header file of watchdog registers
 - Use ioremap_nocache() to access watchdog registers instead

Signed-off-by: Kelvin Cheung <keguang.zhang@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8022/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mach-loongson1/regs-wdt.h

@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
  *
- * Loongson 1 watchdog register definitions.
+ * Loongson 1 Watchdog Register Definitions.
  *
  * This program is free software; you can redistribute	it and/or modify it
  * under  the terms of	the GNU General	 Public License as published by the
@@ -12,11 +12,8 @@
 #ifndef __ASM_MACH_LOONGSON1_REGS_WDT_H
 #define __ASM_MACH_LOONGSON1_REGS_WDT_H
 
-#define LS1X_WDT_REG(x) \
-		((void __iomem *)KSEG1ADDR(LS1X_WDT_BASE + (x)))
-
-#define LS1X_WDT_EN			LS1X_WDT_REG(0x0)
-#define LS1X_WDT_SET			LS1X_WDT_REG(0x4)
-#define LS1X_WDT_TIMER			LS1X_WDT_REG(0x8)
+#define WDT_EN			0x0
+#define WDT_TIMER		0x4
+#define WDT_SET			0x8
 
 #endif /* __ASM_MACH_LOONGSON1_REGS_WDT_H */

arch/mips/loongson1/common/reset.c

@@ -14,12 +14,7 @@
 
 #include <loongson1.h>
 
-static void ls1x_restart(char *command)
-{
-	__raw_writel(0x1, LS1X_WDT_EN);
-	__raw_writel(0x5000000, LS1X_WDT_TIMER);
-	__raw_writel(0x1, LS1X_WDT_SET);
-}
+static void __iomem *wdt_base;
 
 static void ls1x_halt(void)
 {
@@ -29,6 +24,15 @@ static void ls1x_halt(void)
 	}
 }
 
+static void ls1x_restart(char *command)
+{
+	__raw_writel(0x1, wdt_base + WDT_EN);
+	__raw_writel(0x1, wdt_base + WDT_TIMER);
+	__raw_writel(0x1, wdt_base + WDT_SET);
+
+	ls1x_halt();
+}
+
 static void ls1x_power_off(void)
 {
 	ls1x_halt();
@@ -36,6 +40,10 @@ static void ls1x_power_off(void)
 
 static int __init ls1x_reboot_setup(void)
 {
+	wdt_base = ioremap_nocache(LS1X_WDT_BASE, 0x0f);
+	if (!wdt_base)
+		panic("Failed to remap watchdog registers");
+
 	_machine_restart = ls1x_restart;
 	_machine_halt = ls1x_halt;
 	pm_power_off = ls1x_power_off;