[PATCH 14/18] ARM: highbank: Add smc calls to enable/disable the L2

[Ike Panhc]

From: Rob Herring <rob.herring at calxeda.com>

Linux runs in non-secure mode on highbank, so we need secure monitor calls
to enable and disable the PL310.

Signed-off-by: Rob Herring <rob.herring at calxeda.com>
Signed-off-by: Ike Panhc <ike.pan at canonical.com>
---
 arch/arm/mach-highbank/Makefile   |    6 +++++-
 arch/arm/mach-highbank/core.h     |    1 +
 arch/arm/mach-highbank/highbank.c |   15 +++++++++++++++
 arch/arm/mach-highbank/smc.S      |   31 +++++++++++++++++++++++++++++++
 4 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/mach-highbank/smc.S

diff --git a/arch/arm/mach-highbank/Makefile b/arch/arm/mach-highbank/Makefile
index d3f5632..81381c7 100644
--- a/arch/arm/mach-highbank/Makefile
+++ b/arch/arm/mach-highbank/Makefile
@@ -1,4 +1,8 @@
-obj-y					:= clock.o highbank.o system.o
+obj-y					:= clock.o highbank.o system.o smc.o
+
+plus_sec := $(call as-instr,.arch_extension sec,+sec)
+AFLAGS_smc.o				:=-Wa,-march=armv7-a$(plus_sec)
+
 obj-$(CONFIG_DEBUG_HIGHBANK_UART)	+= lluart.o
 obj-$(CONFIG_SMP)			+= platsmp.o
 obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o
diff --git a/arch/arm/mach-highbank/core.h b/arch/arm/mach-highbank/core.h
index 7e33fc9..bc7e77e 100644
--- a/arch/arm/mach-highbank/core.h
+++ b/arch/arm/mach-highbank/core.h
@@ -7,3 +7,4 @@ extern void highbank_lluart_map_io(void);
 static inline void highbank_lluart_map_io(void) {}
 #endif
 
+extern void highbank_smc1(int fn, int arg);
diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c
index 48293f8..3f7a1c4 100644
--- a/arch/arm/mach-highbank/highbank.c
+++ b/arch/arm/mach-highbank/highbank.c
@@ -86,10 +86,25 @@ const static struct of_device_id irq_match[] = {
 	{}
 };
 
+#ifdef CONFIG_CACHE_L2X0
+static void highbank_l2x0_disable(void)
+{
+	/* Disable PL310 L2 Cache controller */
+	highbank_smc1(0x102, 0x0);
+}
+#endif
+
+
 static void __init highbank_init_irq(void)
 {
 	of_irq_init(irq_match);
+
+#ifdef CONFIG_CACHE_L2X0
+	/* Enable PL310 L2 Cache controller */
+	highbank_smc1(0x102, 0x1);
 	l2x0_of_init(0, ~0UL);
+	outer_cache.disable = highbank_l2x0_disable;
+#endif
 }
 
 static void __init highbank_timer_init(void)
diff --git a/arch/arm/mach-highbank/smc.S b/arch/arm/mach-highbank/smc.S
new file mode 100644
index 0000000..8b11632
--- /dev/null
+++ b/arch/arm/mach-highbank/smc.S
@@ -0,0 +1,31 @@
+/*
+ * Copied from omap44xx-smc.S
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Written by Santosh Shilimkar <santosh.shilimkar at ti.com>
+ *
+ *
+ * This program is free software,you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * This is common routine to manage secure monitor API
+ * used to modify the PL310 secure registers.
+ * 'r0' contains the value to be modified and 'r12' contains
+ * the monitor API number. It uses few CPU registers
+ * internally and hence they need be backed up including
+ * link register "lr".
+ * Function signature : void omap_smc1(u32 fn, u32 arg)
+ */
+
+ENTRY(highbank_smc1)
+	stmfd   sp!, {r2-r12, lr}
+	mov	r12, r0
+	mov 	r0, r1
+	dsb
+	smc	#0
+	ldmfd   sp!, {r2-r12, pc}
+ENDPROC(highbank_smc1)
-- 
1.7.9.5