sh: speculative execution support for SH7780.

SH7780 has a speculative execution mode where it can speculatively
perform an instruction fetch for subroutine returns, this allows it
to be enabled. There are some various pitfalls associated with this
mode, so it's left as depending on CONFIG_EXPERIMENTAL and not
enabled by default.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c
index 726acfcb9b77..6451ad630174 100644
--- a/arch/sh/kernel/cpu/init.c
+++ b/arch/sh/kernel/cpu/init.c
@@ -41,6 +41,23 @@ __setup("no" __stringify(x), x##_setup);
 onchip_setup(fpu);
 onchip_setup(dsp);
 
+#ifdef CONFIG_SPECULATIVE_EXECUTION
+#define CPUOPM          0xff2f0000
+#define CPUOPM_RABD     (1 << 5)
+
+static void __init speculative_execution_init(void)
+{
+        /* Clear RABD */
+        ctrl_outl(ctrl_inl(CPUOPM) & ~CPUOPM_RABD, CPUOPM);
+
+        /* Flush the update */
+        (void)ctrl_inl(CPUOPM);
+        ctrl_barrier();
+}
+#else
+#define speculative_execution_init()    do { } while (0)
+#endif
+
 /*
  * Generic first-level cache init
  */
@@ -261,4 +278,6 @@ asmlinkage void __init sh_cpu_init(void)
          */
         ubc_wakeup();
 #endif
+
+        speculative_execution_init();
 }