[MIPS] Correct 74K/1074K erratum workaround

["Maciej W. Rozycki" <macro@xxxxxxxxxxxxxx>]

Make sure 74K revision numbers are not applied to the 1074K.  Also catch 
invalid usage.

Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx>
---
Ralf,

 Please apply.  I saw a similar change fly by, but it lacked the necessary 
readability and the safety guard, to say nothing of the change explanation 
chosen.

  Maciej

linux-mips-74k-erratum.patch
Index: linux-mips-3.12.0-rc1-20130917-4maxp/arch/mips/mm/c-r4k.c
===================================================================
--- linux-mips-3.12.0-rc1-20130917-4maxp.orig/arch/mips/mm/c-r4k.c
+++ linux-mips-3.12.0-rc1-20130917-4maxp/arch/mips/mm/c-r4k.c
@@ -780,20 +780,30 @@ static inline void rm7k_erratum31(void)
 
 static inline void alias_74k_erratum(struct cpuinfo_mips *c)
 {
+	unsigned int imp = c->processor_id & PRID_IMP_MASK;
+	unsigned int rev = c->processor_id & PRID_REV_MASK;
+
 	/*
 	 * Early versions of the 74K do not update the cache tags on a
 	 * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
 	 * aliases. In this case it is better to treat the cache as always
 	 * having aliases.
 	 */
-	if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_ENCODE_332(2, 4, 0))
-		c->dcache.flags |= MIPS_CACHE_VTAG;
-	if ((c->processor_id & PRID_REV_MASK) == PRID_REV_ENCODE_332(2, 4, 0))
-		write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
-	if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_1074K &&
-	    (c->processor_id & PRID_REV_MASK) <= PRID_REV_ENCODE_332(1, 1, 0)) {
-		c->dcache.flags |= MIPS_CACHE_VTAG;
-		write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
+	switch (imp) {
+	case PRID_IMP_74K:
+		if (rev <= PRID_REV_ENCODE_332(2, 4, 0))
+			c->dcache.flags |= MIPS_CACHE_VTAG;
+		if (rev == PRID_REV_ENCODE_332(2, 4, 0))
+			write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
+		break;
+	case PRID_IMP_1074K:
+		if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) {
+			c->dcache.flags |= MIPS_CACHE_VTAG;
+			write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
+		}
+		break;
+	default:
+		BUG();
 	}
 }