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authorPaul Mundt <lethal@linux-sh.org>2010-04-19 17:27:17 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-04-19 17:27:17 +0900
commit3cf6fa1e334a3a4af702f92229690195018b747f (patch)
treeebb108e02f13a6e95418245164b45a2a616d421c /arch/sh/mm/cache-shx3.c
parentd9c944463d8f3f7cafaaba8f3e44df62ce817484 (diff)
sh: Enable SH-X3 hardware synonym avoidance handling.
This enables support for the hardware synonym avoidance handling on SH-X3 CPUs for the case where dcache aliases are possible. icache handling is retained, but we flip on broadcasting of the block invalidations due to the lack of coherency otherwise on SMP. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm/cache-shx3.c')
-rw-r--r--arch/sh/mm/cache-shx3.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/sh/mm/cache-shx3.c b/arch/sh/mm/cache-shx3.c
new file mode 100644
index 000000000000..65936c4fef03
--- /dev/null
+++ b/arch/sh/mm/cache-shx3.c
@@ -0,0 +1,35 @@
+/*
+ * arch/sh/mm/cache-shx3.c - SH-X3 optimized cache ops
+ *
+ * Copyright (C) 2010 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <asm/cache.h>
+
+#define CCR_CACHE_SNM 0x40000 /* Hardware-assisted synonym avoidance */
+#define CCR_CACHE_IBE 0x1000000 /* ICBI broadcast */
+
+void __init shx3_cache_init(void)
+{
+ unsigned int ccr;
+
+ ccr = __raw_readl(CCR);
+
+ if (boot_cpu_data.dcache.n_aliases)
+ ccr |= CCR_CACHE_SNM;
+
+#ifdef CONFIG_SMP
+ /*
+ * Broadcast I-cache block invalidations by default.
+ */
+ ccr |= CCR_CACHE_IBE;
+#endif
+
+ writel_uncached(ccr, CCR);
+}