powerpc: Fix major revision number for Freescale cores

Some 74xx cores by Freescale are using the configuration field instead
of the major revision field for their revision number.  This corrects
the wrong behaviour for those ppc cores including my one.

There is a reference document at Freecale.  It describes the PVR
register.  This is based on that pdf.  You can find the document at:

http://www.freescale.com/files/archives/doc/support_info/PPCPVR.pdf

Signed-off-by: Martin Langer <martin-langer@gmx.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/setup-common.c

@@ -254,8 +254,21 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 	/* If we are a Freescale core do a simple check so
 	 * we dont have to keep adding cases in the future */
 	if (PVR_VER(pvr) & 0x8000) {
+		switch (PVR_VER(pvr)) {
+		case 0x8000:	/* 7441/7450/7451, Voyager */
+		case 0x8001:	/* 7445/7455, Apollo 6 */
+		case 0x8002:	/* 7447/7457, Apollo 7 */
+		case 0x8003:	/* 7447A, Apollo 7 PM */
+		case 0x8004:	/* 7448, Apollo 8 */
+		case 0x800c:	/* 7410, Nitro */
+			maj = ((pvr >> 8) & 0xF);
+			min = PVR_MIN(pvr);
+			break;
+		default:	/* e500/book-e */
 			maj = PVR_MAJ(pvr);
 			min = PVR_MIN(pvr);
+			break;
+		}
 	} else {
 		switch (PVR_VER(pvr)) {
 			case 0x0020:	/* 403 family */