[ARM PATCH] 2325/1: Cleanup IXP2000 reset handling

Patch from Deepak Saxena

On IXDP2801 we need to write a magic sequence to the CPLD to ensure
a full system reset instead of just CPU reset. Also cleanup some
comments and copyrights while we are in here.

Signed-off-by: Deepak Saxena
Signed-off-by: Russell King

include/asm-arm/arch-ixp2000/system.h

@@ -2,6 +2,7 @@
  * linux/include/asm-arm/arch-ixp2000/system.h
  *
  * Copyright (C) 2002 Intel Corp.
+ * Copyricht (C) 2003-2005 MontaVista Software, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -20,11 +21,29 @@ static inline void arch_reset(char mode)
 {
 	cli();
 
-	if (machine_is_ixdp2401() || machine_is_ixdp2801()) {
-		*IXDP2X01_CPLD_FLASH_REG = ((0 >> IXDP2X01_FLASH_WINDOW_BITS) | IXDP2X01_CPLD_FLASH_INTERN);
+	/*
+	 * Reset flash banking register so that we are pointing at
+	 * RedBoot bank.
+	 */
+	if (machine_is_ixdp2401()) {
+		*IXDP2X01_CPLD_FLASH_REG = ((0 >> IXDP2X01_FLASH_WINDOW_BITS)
+						| IXDP2X01_CPLD_FLASH_INTERN);
 		*IXDP2X01_CPLD_RESET_REG = 0xffffffff;
 	}
 
+	/*
+	 * On IXDP2801 we need to write this magic sequence to the CPLD
+	 * to cause a complete reset of the CPU and all external devices
+	 * and moves the flash bank register back to 0.
+	 */
+	if (machine_is_ixdp2801()) {
+		unsigned long reset_reg = *IXDP2X01_CPLD_RESET_REG;
+		reset_reg = 0x55AA0000 | (reset_reg & 0x0000FFFF);
+		*IXDP2X01_CPLD_RESET_REG = reset_reg;
+		mb();
+		*IXDP2X01_CPLD_RESET_REG = 0x80000000;
+	}
+
 	/*
 	 * We do a reset all if we are PCI master. We could be a slave and we
 	 * don't want to do anything funky on the PCI bus.