[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>

5 files changed, 50 insertions, 0 deletions

diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 272702accd8b..b4748e3171c6 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -338,6 +338,7 @@ unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
                          */
                         ptr = (unsigned long)buf->ptr;
                         dmac_clean_range(ptr, ptr + size);
+                        outer_clean_range(__pa(ptr), __pa(ptr) + size);
                 }
                 free_safe_buffer(device_info, buf);
         }
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index bbab134cd82d..243aea458057 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -88,6 +88,9 @@ struct cpu_user_fns cpu_user;
 #ifdef MULTI_CACHE
 struct cpu_cache_fns cpu_cache;
 #endif
+#ifdef CONFIG_OUTER_CACHE
+struct outer_cache_fns outer_cache;
+#endif
 
 struct stack {
         u32 irq[3];
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index aade2f72c920..a84eed9f8542 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -609,3 +609,6 @@ config NEEDS_SYSCALL_FOR_CMPXCHG
           Forget about fast user space cmpxchg support.
           It is just not possible.
 
+config OUTER_CACHE
+        bool
+        default n
diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index 6a9c362fef5e..83bd035c7d5e 100644
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -208,6 +208,7 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
                 unsigned long kaddr = (unsigned long)page_address(page);
                 memset(page_address(page), 0, size);
                 dmac_flush_range(kaddr, kaddr + size);
+                outer_flush_range(__pa(kaddr), __pa(kaddr) + size);
         }
 
         /*
@@ -485,15 +486,20 @@ void consistent_sync(void *vaddr, size_t size, int direction)
         unsigned long start = (unsigned long)vaddr;
         unsigned long end   = start + size;
 
+        BUG_ON(!virt_addr_valid(start) || !virt_addr_valid(end));
+
         switch (direction) {
         case DMA_FROM_DEVICE:           /* invalidate only */
                 dmac_inv_range(start, end);
+                outer_inv_range(__pa(start), __pa(end));
                 break;
         case DMA_TO_DEVICE:             /* writeback only */
                 dmac_clean_range(start, end);
+                outer_clean_range(__pa(start), __pa(end));
                 break;
         case DMA_BIDIRECTIONAL:         /* writeback and invalidate */
                 dmac_flush_range(start, end);
+                outer_flush_range(__pa(start), __pa(end));
                 break;
         default:
                 BUG();
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