[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>

2 files changed, 9 insertions, 0 deletions

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();