Initial import

1 files changed, 189 insertions, 0 deletions

diff --git a/arch/sh/mm/cache-sh2a.c b/arch/sh/mm/cache-sh2a.c
new file mode 100644
index 000000000..ee87d0812
--- /dev/null
+++ b/arch/sh/mm/cache-sh2a.c
@@ -0,0 +1,189 @@
+/*
+ * 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>
+
+/*
+ * The maximum number of pages we support up to when doing ranged dcache
+ * flushing. Anything exceeding this will simply flush the dcache in its
+ * entirety.
+ */
+#define MAX_OCACHE_PAGES	32
+#define MAX_ICACHE_PAGES	32
+
+#ifdef CONFIG_CACHE_WRITEBACK
+static void sh2a_flush_oc_line(unsigned long v, int way)
+{
+	unsigned long addr = (v & 0x000007f0) | (way << 11);
+	unsigned long data;
+
+	data = __raw_readl(CACHE_OC_ADDRESS_ARRAY | addr);
+	if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
+		data &= ~SH_CACHE_UPDATED;
+		__raw_writel(data, CACHE_OC_ADDRESS_ARRAY | addr);
+	}
+}
+#endif
+
+static void sh2a_invalidate_line(unsigned long cache_addr, unsigned long v)
+{
+	/* Set associative bit to hit all ways */
+	unsigned long addr = (v & 0x000007f0) | SH_CACHE_ASSOC;
+	__raw_writel((addr & CACHE_PHYSADDR_MASK), cache_addr | addr);
+}
+
+/*
+ * Write back the dirty D-caches, but not invalidate them.
+ */
+static void sh2a__flush_wback_region(void *start, int size)
+{
+#ifdef CONFIG_CACHE_WRITEBACK
+	unsigned long v;
+	unsigned long begin, end;
+	unsigned long flags;
+	int nr_ways;
+
+	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+		& ~(L1_CACHE_BYTES-1);
+	nr_ways = current_cpu_data.dcache.ways;
+
+	local_irq_save(flags);
+	jump_to_uncached();
+
+	/* If there are too many pages then flush the entire cache */
+	if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) {
+		begin = CACHE_OC_ADDRESS_ARRAY;
+		end = begin + (nr_ways * current_cpu_data.dcache.way_size);
+
+		for (v = begin; v < end; v += L1_CACHE_BYTES) {
+			unsigned long data = __raw_readl(v);
+			if (data & SH_CACHE_UPDATED)
+				__raw_writel(data & ~SH_CACHE_UPDATED, v);
+		}
+	} else {
+		int way;
+		for (way = 0; way < nr_ways; way++) {
+			for (v = begin; v < end; v += L1_CACHE_BYTES)
+				sh2a_flush_oc_line(v, way);
+		}
+	}
+
+	back_to_cached();
+	local_irq_restore(flags);
+#endif
+}
+
+/*
+ * Write back the dirty D-caches and invalidate them.
+ */
+static void sh2a__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) {
+#ifdef CONFIG_CACHE_WRITEBACK
+		int way;
+		int nr_ways = current_cpu_data.dcache.ways;
+		for (way = 0; way < nr_ways; way++)
+			sh2a_flush_oc_line(v, way);
+#endif
+		sh2a_invalidate_line(CACHE_OC_ADDRESS_ARRAY, v);
+	}
+
+	back_to_cached();
+	local_irq_restore(flags);
+}
+
+/*
+ * Invalidate the D-caches, but no write back please
+ */
+static void sh2a__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();
+
+	/* If there are too many pages then just blow the cache */
+	if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) {
+		__raw_writel(__raw_readl(SH_CCR) | CCR_OCACHE_INVALIDATE,
+			     SH_CCR);
+	} else {
+		for (v = begin; v < end; v += L1_CACHE_BYTES)
+			sh2a_invalidate_line(CACHE_OC_ADDRESS_ARRAY, v);
+	}
+
+	back_to_cached();
+	local_irq_restore(flags);
+}
+
+/*
+ * Write back the range of D-cache, and purge the I-cache.
+ */
+static void sh2a_flush_icache_range(void *args)
+{
+	struct flusher_data *data = args;
+	unsigned long start, end;
+	unsigned long v;
+	unsigned long flags;
+
+	start = data->addr1 & ~(L1_CACHE_BYTES-1);
+	end = (data->addr2 + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1);
+
+#ifdef CONFIG_CACHE_WRITEBACK
+	sh2a__flush_wback_region((void *)start, end-start);
+#endif
+
+	local_irq_save(flags);
+	jump_to_uncached();
+
+	/* I-Cache invalidate */
+	/* If there are too many pages then just blow the cache */
+	if (((end - start) >> PAGE_SHIFT) >= MAX_ICACHE_PAGES) {
+		__raw_writel(__raw_readl(SH_CCR) | CCR_ICACHE_INVALIDATE,
+			     SH_CCR);
+	} else {
+		for (v = start; v < end; v += L1_CACHE_BYTES)
+			sh2a_invalidate_line(CACHE_IC_ADDRESS_ARRAY, v);
+	}
+
+	back_to_cached();
+	local_irq_restore(flags);
+}
+
+void __init sh2a_cache_init(void)
+{
+	local_flush_icache_range	= sh2a_flush_icache_range;
+
+	__flush_wback_region		= sh2a__flush_wback_region;
+	__flush_purge_region		= sh2a__flush_purge_region;
+	__flush_invalidate_region	= sh2a__flush_invalidate_region;
+}