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, 129 insertions, 0 deletions

diff --git a/arch/sh/mm/cache-sh2a.c b/arch/sh/mm/cache-sh2a.c
new file mode 100644
index 0000000..62c0c5f
--- /dev/null
+++ b/arch/sh/mm/cache-sh2a.c
@@ -0,0 +1,129 @@
+/*
+ * arch/sh/mm/cache-sh2a.c
+ *
+ * Copyright (C) 2008 Yoshinori Sato
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+
+#include <asm/cache.h>
+#include <asm/addrspace.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>
+
+void __flush_wback_region(void *start, int size)
+{
+	unsigned long v;
+	unsigned long begin, end;
+	unsigned long flags;
+
+	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+		& ~(L1_CACHE_BYTES-1);
+
+	local_irq_save(flags);
+	jump_to_uncached();
+
+	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+		unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0);
+		int way;
+		for (way = 0; way < 4; way++) {
+			unsigned long data =  ctrl_inl(addr | (way << 11));
+			if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
+				data &= ~SH_CACHE_UPDATED;
+				ctrl_outl(data, addr | (way << 11));
+			}
+		}
+	}
+
+	back_to_cached();
+	local_irq_restore(flags);
+}
+
+void __flush_purge_region(void *start, int size)
+{
+	unsigned long v;
+	unsigned long begin, end;
+	unsigned long flags;
+
+	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+		& ~(L1_CACHE_BYTES-1);
+
+	local_irq_save(flags);
+	jump_to_uncached();
+
+	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+		ctrl_outl((v & CACHE_PHYSADDR_MASK),
+			  CACHE_OC_ADDRESS_ARRAY | (v & 0x000003f0) | 0x00000008);
+	}
+	back_to_cached();
+	local_irq_restore(flags);
+}
+
+void __flush_invalidate_region(void *start, int size)
+{
+	unsigned long v;
+	unsigned long begin, end;
+	unsigned long flags;
+
+	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+		& ~(L1_CACHE_BYTES-1);
+	local_irq_save(flags);
+	jump_to_uncached();
+
+#ifdef CONFIG_CACHE_WRITEBACK
+	ctrl_outl(ctrl_inl(CCR) | CCR_OCACHE_INVALIDATE, CCR);
+	/* I-cache invalidate */
+	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+		ctrl_outl((v & CACHE_PHYSADDR_MASK),
+			  CACHE_IC_ADDRESS_ARRAY | (v & 0x000003f0) | 0x00000008);
+	}
+#else
+	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+		ctrl_outl((v & CACHE_PHYSADDR_MASK),
+			  CACHE_IC_ADDRESS_ARRAY | (v & 0x000003f0) | 0x00000008);
+		ctrl_outl((v & CACHE_PHYSADDR_MASK),
+			  CACHE_OC_ADDRESS_ARRAY | (v & 0x000003f0) | 0x00000008);
+	}
+#endif
+	back_to_cached();
+	local_irq_restore(flags);
+}
+
+/* WBack O-Cache and flush I-Cache */
+void flush_icache_range(unsigned long start, unsigned long end)
+{
+	unsigned long v;
+	unsigned long flags;
+
+	start = start & ~(L1_CACHE_BYTES-1);
+	end = (end + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1);
+
+	local_irq_save(flags);
+	jump_to_uncached();
+
+	for (v = start; v < end; v+=L1_CACHE_BYTES) {
+		unsigned long addr = (v & 0x000007f0);
+		int way;
+		/* O-Cache writeback */
+		for (way = 0; way < 4; way++) {
+			unsigned long data =  ctrl_inl(CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));
+			if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
+				data &= ~SH_CACHE_UPDATED;
+				ctrl_outl(data, CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));
+			}
+		}
+		/* I-Cache invalidate */
+		ctrl_outl(addr,
+			  CACHE_IC_ADDRESS_ARRAY | addr | 0x00000008);
+	}
+
+	back_to_cached();
+	local_irq_restore(flags);
+}