SH2(A) cache update

Includes:
- SH2 (7619) Writeback support.
- SH2A cache handling fix.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 36 insertions, 9 deletions

diff --git a/arch/sh/mm/cache-sh2.c b/arch/sh/mm/cache-sh2.c
index 6614033f6be..c4e80d2b764 100644
--- a/arch/sh/mm/cache-sh2.c
+++ b/arch/sh/mm/cache-sh2.c
@@ -2,6 +2,7 @@
  * arch/sh/mm/cache-sh2.c
  *
  * Copyright (C) 2002 Paul Mundt
+ * Copyright (C) 2008 Yoshinori Sato
  *
  * Released under the terms of the GNU GPL v2.0.
  */
@@ -24,8 +25,15 @@ void __flush_wback_region(void *start, int size)
 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
 		& ~(L1_CACHE_BYTES-1);
 	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
-		/* FIXME cache purge */
-		ctrl_outl((v & 0x1ffffc00), (v & 0x00000ff0) | 0x00000008);
+		unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0);
+		int way;
+		for (way = 0; way < 4; way++) {
+			unsigned long data =  ctrl_inl(addr | (way << 12));
+			if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
+				data &= ~SH_CACHE_UPDATED;
+				ctrl_outl(data, addr | (way << 12));
+			}
+		}
 	}
 }
 
@@ -37,21 +45,40 @@ void __flush_purge_region(void *start, int size)
 	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
 		& ~(L1_CACHE_BYTES-1);
-	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
-		ctrl_outl((v & 0x1ffffc00), (v & 0x00000ff0) | 0x00000008);
-	}
+
+	for (v = begin; v < end; v+=L1_CACHE_BYTES)
+		ctrl_outl((v & CACHE_PHYSADDR_MASK),
+			  CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
 }
 
 void __flush_invalidate_region(void *start, int size)
 {
+#ifdef CONFIG_CACHE_WRITEBACK
+	/*
+	 * SH-2 does not support individual line invalidation, only a
+	 * global invalidate.
+	 */
+	unsigned long ccr;
+	unsigned long flags;
+	local_irq_save(flags);
+	jump_to_uncached();
+
+	ccr = ctrl_inl(CCR);
+	ccr |= CCR_CACHE_INVALIDATE;
+	ctrl_outl(ccr, CCR);
+
+	back_to_cached();
+	local_irq_restore(flags);
+#else
 	unsigned long v;
 	unsigned long begin, end;
 
 	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
 		& ~(L1_CACHE_BYTES-1);
-	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
-		ctrl_outl((v & 0x1ffffc00), (v & 0x00000ff0) | 0x00000008);
-	}
-}
 
+	for (v = begin; v < end; v+=L1_CACHE_BYTES)
+		ctrl_outl((v & CACHE_PHYSADDR_MASK),
+			  CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
+#endif
+}