[PATCH][MIPS] add DMA declare coherent memory support

[Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>]

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>

diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/arch/mips/Kconfig 
linux/arch/mips/Kconfig
--- linux-orig/arch/mips/Kconfig        2009-04-21 10:55:44.353177629 +0900
+++ linux/arch/mips/Kconfig     2009-04-21 11:01:02.801170966 +0900
@@ -3,6 +3,7 @@ config MIPS
        default y
        select HAVE_IDE
        select HAVE_OPROFILE
+       select HAVE_GENERIC_DMA_COHERENT
        select HAVE_ARCH_KGDB
        # Horrible source of confusion.  Die, die, die ...
        select EMBEDDED
diff -pruN -X /home/yuasa/Memo/dontdiff 
linux-orig/arch/mips/include/asm/dma-mapping.h 
linux/arch/mips/include/asm/dma-mapping.h
--- linux-orig/arch/mips/include/asm/dma-mapping.h      2009-04-21 
10:55:44.549177717 +0900
+++ linux/arch/mips/include/asm/dma-mapping.h   2009-04-21 11:19:40.077177611 
+0900
@@ -3,6 +3,7 @@
 
 #include <asm/scatterlist.h>
 #include <asm/cache.h>
+#include <asm-generic/dma-coherent.h>
 
 void *dma_alloc_noncoherent(struct device *dev, size_t size,
                           dma_addr_t *dma_handle, gfp_t flag);
@@ -73,7 +74,6 @@ extern int dma_is_consistent(struct devi
 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
               enum dma_data_direction direction);
 
-#if 0
 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 
 extern int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
@@ -81,6 +81,5 @@ extern int dma_declare_coherent_memory(s
 extern void dma_release_declared_memory(struct device *dev);
 extern void * dma_mark_declared_memory_occupied(struct device *dev,
        dma_addr_t device_addr, size_t size);
-#endif
 
 #endif /* _ASM_DMA_MAPPING_H */
diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/arch/mips/mm/dma-default.c 
linux/arch/mips/mm/dma-default.c
--- linux-orig/arch/mips/mm/dma-default.c       2009-04-21 10:55:46.409177601 
+0900
+++ linux/arch/mips/mm/dma-default.c    2009-04-21 11:21:17.061177557 +0900
@@ -89,6 +89,9 @@ void *dma_alloc_coherent(struct device *
 {
        void *ret;
 
+       if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
+               return ret;
+
        gfp = massage_gfp_flags(dev, gfp);
 
        ret = (void *) __get_free_pages(gfp, get_order(size));
@@ -120,8 +123,12 @@ EXPORT_SYMBOL(dma_free_noncoherent);
 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
        dma_addr_t dma_handle)
 {
+       int order = get_order(size);
        unsigned long addr = (unsigned long) vaddr;
 
+       if (dma_release_from_coherent(dev, order, vaddr))
+               return;
+
        plat_unmap_dma_mem(dev, dma_handle);
 
        if (!plat_device_is_coherent(dev))