[POWERPC] Factor zImage's 44x reset code out of ebony.c

The ebony_exit() function which resets the Ebony board should in fact
be common to most if not all 44x boards.  This moves the function out
into 44x.c, renaming it, so it can be used by other 44x platforms.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/44x.c

@@ -38,3 +38,19 @@ void ibm44x_fixup_memsize(void)
 
 	dt_fixup_memory(0, memsize);
 }
+
+#define SPRN_DBCR0		0x134
+#define   DBCR0_RST_SYSTEM	0x30000000
+
+void ibm44x_dbcr_reset(void)
+{
+	unsigned long tmp;
+
+	asm volatile (
+		"mfspr	%0,%1\n"
+		"oris	%0,%0,%2@h\n"
+		"mtspr	%1,%0"
+		: "=&r"(tmp) : "i"(SPRN_DBCR0), "i"(DBCR0_RST_SYSTEM)
+		);
+
+}

arch/powerpc/boot/44x.h

@@ -11,6 +11,8 @@
 #define _PPC_BOOT_44X_H_
 
 void ibm44x_fixup_memsize(void);
+
+void ibm44x_dbcr_reset(void);
 void ebony_init(void *mac0, void *mac1);
 
 #endif /* _PPC_BOOT_44X_H_ */

arch/powerpc/boot/ebony.c

@@ -102,26 +102,10 @@ static void ebony_fixups(void)
 	dt_fixup_mac_addresses(ebony_mac0, ebony_mac1);
 }
 
-#define SPRN_DBCR0		0x134
-#define   DBCR0_RST_SYSTEM	0x30000000
-
-static void ebony_exit(void)
-{
-	unsigned long tmp;
-
-	asm volatile (
-		"mfspr	%0,%1\n"
-		"oris	%0,%0,%2@h\n"
-		"mtspr	%1,%0"
-		: "=&r"(tmp) : "i"(SPRN_DBCR0), "i"(DBCR0_RST_SYSTEM)
-		);
-
-}
-
 void ebony_init(void *mac0, void *mac1)
 {
 	platform_ops.fixups = ebony_fixups;
-	platform_ops.exit = ebony_exit;
+	platform_ops.exit = ibm44x_dbcr_reset;
 	ebony_mac0 = mac0;
 	ebony_mac1 = mac1;
 	ft_init(_dtb_start, _dtb_end - _dtb_start, 32);