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Diffstat (limited to 'arch/sh/kernel/cpu/init.c')
-rw-r--r--arch/sh/kernel/cpu/init.c36
1 files changed, 33 insertions, 3 deletions
diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c
index ad85421099c..e932ebef473 100644
--- a/arch/sh/kernel/cpu/init.c
+++ b/arch/sh/kernel/cpu/init.c
@@ -3,7 +3,7 @@
*
* CPU init code
*
- * Copyright (C) 2002 - 2007 Paul Mundt
+ * Copyright (C) 2002 - 2009 Paul Mundt
* Copyright (C) 2003 Richard Curnow
*
* This file is subject to the terms and conditions of the GNU General Public
@@ -62,6 +62,37 @@ static void __init speculative_execution_init(void)
#define speculative_execution_init() do { } while (0)
#endif
+#ifdef CONFIG_CPU_SH4A
+#define EXPMASK 0xff2f0004
+#define EXPMASK_RTEDS (1 << 0)
+#define EXPMASK_BRDSSLP (1 << 1)
+#define EXPMASK_MMCAW (1 << 4)
+
+static void __init expmask_init(void)
+{
+ unsigned long expmask = __raw_readl(EXPMASK);
+
+ /*
+ * Future proofing.
+ *
+ * Disable support for slottable sleep instruction
+ * and non-nop instructions in the rte delay slot.
+ */
+ expmask &= ~(EXPMASK_RTEDS | EXPMASK_BRDSSLP);
+
+ /*
+ * Enable associative writes to the memory-mapped cache array
+ * until the cache flush ops have been rewritten.
+ */
+ expmask |= EXPMASK_MMCAW;
+
+ __raw_writel(expmask, EXPMASK);
+ ctrl_barrier();
+}
+#else
+#define expmask_init() do { } while (0)
+#endif
+
/* 2nd-level cache init */
void __uses_jump_to_uncached __attribute__ ((weak)) l2_cache_init(void)
{
@@ -268,11 +299,9 @@ asmlinkage void __init sh_cpu_init(void)
cache_init();
if (raw_smp_processor_id() == 0) {
-#ifdef CONFIG_MMU
shm_align_mask = max_t(unsigned long,
current_cpu_data.dcache.way_size - 1,
PAGE_SIZE - 1);
-#endif
/* Boot CPU sets the cache shape */
detect_cache_shape();
@@ -321,4 +350,5 @@ asmlinkage void __init sh_cpu_init(void)
#endif
speculative_execution_init();
+ expmask_init();
}