[MIPS] Sibyte: Replace SB1 cachecode with standard R4000 class cache code.

It may not be perfect yet but the SB1 code is badly borken and has
horrible performance issues.

Downside: This seriously breaks support for pass 1 parts of the BCM1250
where indexed cacheops don't work quite reliable but I seem to be the
last one on the planet with a pass 1 part anyway.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 18 insertions, 4 deletions

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index bad571971bf6..738b89803a44 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -9,6 +9,7 @@
  */
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/linkage.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/bitops.h>
@@ -948,12 +949,16 @@ static void __init probe_pcache(void)
         switch (c->cputype) {
         case CPU_20KC:
         case CPU_25KF:
+        case CPU_SB1:
+        case CPU_SB1A:
                 c->dcache.flags |= MIPS_CACHE_PINDEX;
+                break;
+
         case CPU_R10000:
         case CPU_R12000:
         case CPU_R14000:
-        case CPU_SB1:
                 break;
+
         case CPU_24K:
         case CPU_34K:
         case CPU_74K:
@@ -1235,11 +1240,20 @@ void __init r4k_cache_init(void)
 {
         extern void build_clear_page(void);
         extern void build_copy_page(void);
-        extern char except_vec2_generic;
+        extern char __weak except_vec2_generic;
+        extern char __weak except_vec2_sb1;
         struct cpuinfo_mips *c = &current_cpu_data;
 
-        /* Default cache error handler for R4000 and R5000 family */
-        set_uncached_handler (0x100, &except_vec2_generic, 0x80);
+        switch (c->cputype) {
+        case CPU_SB1:
+        case CPU_SB1A:
+                set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
+                break;
+
+        default:
+                set_uncached_handler(0x100, &except_vec2_generic, 0x80);
+                break;
+        }
 
         probe_pcache();
         setup_scache();