ARM: realview: remove private barrier implementation

The realview barrier implementation tries to avoid calling outer_sync in order
to not lock up as a result of a bug in the l220 cache controller.

This gets in the way of the multiplatform support, but we can still remove
it if we make sure that the outer_sync function never gets called, by replacing
the function pointer with NULL, right after initialization.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[Fixed up header inclusions]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-realview/Kconfig

@@ -36,7 +36,6 @@ config REALVIEW_EB_A9MP
 config REALVIEW_EB_ARM11MP
 	bool "Support ARM11MPCore Tile"
 	depends on MACH_REALVIEW_EB
-	select ARCH_HAS_BARRIERS if SMP
 	select CPU_V6K
 	select HAVE_ARM_SCU if SMP
 	select HAVE_ARM_TWD if SMP
@@ -57,7 +56,6 @@ config REALVIEW_EB_ARM11MP_REVB
 
 config MACH_REALVIEW_PB11MP
 	bool "Support RealView(R) Platform Baseboard for ARM11MPCore"
-	select ARCH_HAS_BARRIERS if SMP
 	select ARM_GIC
 	select CPU_V6K
 	select HAVE_ARM_SCU if SMP

arch/arm/mach-realview/include/mach/barriers.h

-/*
- * Barriers redefined for RealView ARM11MPCore platforms with L220 cache
- * controller to work around hardware errata causing the outer_sync()
- * operation to deadlock the system.
- */
-#define mb()		dsb()
-#define rmb()		dsb()
-#define wmb()		mb()

arch/arm/mach-realview/realview_eb.c

@@ -38,6 +38,7 @@
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/smp_twd.h>
 #include <asm/system_info.h>
+#include <asm/outercache.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -450,6 +451,12 @@ static void __init realview_eb_init(void)
 		 * Bits:  .... ...0 0111 1001 0000 .... .... ....
 		 */
 		l2x0_init(__io_address(REALVIEW_EB11MP_L220_BASE), 0x00790000, 0xfe000fff);
+
+		/*
+		 * due to a bug in the l220 cache controller, we must not call
+		 * the sync function. stub it out here instead!
+		 */
+		outer_cache.sync = NULL;
 #endif
 		pmu_device.name = core_tile_a9mp() ? "armv7-pmu" : "armv6-pmu";
 		platform_device_register(&pmu_device);

arch/arm/mach-realview/realview_pb11mp.c

@@ -42,6 +42,7 @@
 #include <asm/mach/flash.h>
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
+#include <asm/outercache.h>
 
 #include <mach/board-pb11mp.h>
 #include <mach/irqs.h>
@@ -345,6 +346,11 @@ static void __init realview_pb11mp_init(void)
 	 * Bits:  .... ...0 0111 1001 0000 .... .... ....
 	 */
 	l2x0_init(__io_address(REALVIEW_TC11MP_L220_BASE), 0x00790000, 0xfe000fff);
+	/*
+	 * due to a bug in the l220 cache controller, we must not call
+	 * the sync function. stub it out here instead!
+	 */
+	outer_cache.sync = NULL;
 #endif
 
 	realview_flash_register(realview_pb11mp_flash_resource,