[ARM] 4134/1: Add generic support for outer caches

The outer cache can be L2 as on RealView/EB MPCore platform or even L3
or further on ARMv7 cores. This patch adds the generic support for
flushing the outer cache in the DMA operations.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 37 insertions, 0 deletions

diff --git a/include/asm-arm/cacheflush.h b/include/asm-arm/cacheflush.h
index 5f531ea03059..ce60b3702ba5 100644
--- a/include/asm-arm/cacheflush.h
+++ b/include/asm-arm/cacheflush.h
@@ -190,6 +190,12 @@ struct cpu_cache_fns {
         void (*dma_flush_range)(unsigned long, unsigned long);
 };
 
+struct outer_cache_fns {
+        void (*inv_range)(unsigned long, unsigned long);
+        void (*clean_range)(unsigned long, unsigned long);
+        void (*flush_range)(unsigned long, unsigned long);
+};
+
 /*
  * Select the calling method
  */
@@ -246,6 +252,37 @@ extern void dmac_flush_range(unsigned long, unsigned long);
 
 #endif
 
+#ifdef CONFIG_OUTER_CACHE
+
+extern struct outer_cache_fns outer_cache;
+
+static inline void outer_inv_range(unsigned long start, unsigned long end)
+{
+        if (outer_cache.inv_range)
+                outer_cache.inv_range(start, end);
+}
+static inline void outer_clean_range(unsigned long start, unsigned long end)
+{
+        if (outer_cache.clean_range)
+                outer_cache.clean_range(start, end);
+}
+static inline void outer_flush_range(unsigned long start, unsigned long end)
+{
+        if (outer_cache.flush_range)
+                outer_cache.flush_range(start, end);
+}
+
+#else
+
+static inline void outer_inv_range(unsigned long start, unsigned long end)
+{ }
+static inline void outer_clean_range(unsigned long start, unsigned long end)
+{ }
+static inline void outer_flush_range(unsigned long start, unsigned long end)
+{ }
+
+#endif
+
 /*
  * flush_cache_vmap() is used when creating mappings (eg, via vmap,
  * vmalloc, ioremap etc) in kernel space for pages.  Since the