rework reboot mechanism with the new watchdog fixes

The fixing of the watchdog driver makes it generate a NMI so the reboot_fixup
can no longer be called from NMI context, instead, override the machine_retart
callback with our southrbridge reboot mechanism. Patch by Bernhard Loos.

SVN-Revision: 19977

target/linux/rdc/config-2.6.30

@@ -280,7 +280,7 @@ CONFIG_X86_MINIMUM_CPU_FAMILY=4
 CONFIG_X86_POPAD_OK=y
 # CONFIG_X86_PPRO_FENCE is not set
 CONFIG_X86_RDC321X=y
-CONFIG_X86_REBOOTFIXUPS=y
+# CONFIG_X86_REBOOTFIXUPS is not set
 # CONFIG_X86_RESERVE_LOW_64K is not set
 # CONFIG_X86_UP_APIC is not set
 # CONFIG_X86_VERBOSE_BOOTUP is not set

target/linux/rdc/files-2.6.30/arch/x86/mach-rdc321x/Makefile

@@ -1,5 +1,5 @@
 #
 # Makefile for the RDC321x specific parts of the kernel
 #
-obj-$(CONFIG_X86_RDC321X)        := gpio.o platform.o pci.o
+obj-$(CONFIG_X86_RDC321X)        := gpio.o platform.o pci.o reboot.o
 

target/linux/rdc/files-2.6.30/arch/x86/mach-rdc321x/reboot.c

@@ -0,0 +1,44 @@
+/*
+ *  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 Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the
+ *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+ *
+ */
+
+#include <asm/reboot.h>
+#include <asm/io.h>
+
+static void rdc321x_reset(void)
+{
+	unsigned i;
+
+	/* write to southbridge config register 0x41
+	   enable pci reset on cpu reset, make internal port 0x92 writeable
+	   and switch port 0x92 to internal */
+	outl(0x80003840, 0xCF8);
+	i = inl(0xCFC);
+	i |= 0x1600;
+	outl(i, 0xCFC);
+
+	/* soft reset */
+	outb(1, 0x92);
+}
+
+static int __init rdc_setup_reset(void)
+{
+	machine_ops.emergency_restart = rdc321x_reset;
+	return 0;
+}
+
+arch_initcall(rdc_setup_reset);