nios2: use the generic uncached segment support in dma-direct

Stop providing our own arch alloc/free hooks and just expose the segment
offset and use the generic dma-direct allocator.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ley Foon Tan <ley.foon.tan@intel.com>

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 26a9c76..44b5da3 100644 (file)
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -4,6 +4,7 @@ config NIOS2
        select ARCH_32BIT_OFF_T
        select ARCH_HAS_SYNC_DMA_FOR_CPU
        select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+       select ARCH_HAS_UNCACHED_SEGMENT
        select ARCH_NO_SWAP
        select TIMER_OF
        select GENERIC_ATOMIC64

diff --git a/arch/nios2/include/asm/page.h b/arch/nios2/include/asm/page.h
index f1fbdc4..79fcac6 100644 (file)
--- a/arch/nios2/include/asm/page.h
+++ b/arch/nios2/include/asm/page.h
@@ -101,12 +101,6 @@ static inline bool pfn_valid(unsigned long pfn)
 # define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 
-# define UNCAC_ADDR(addr)      \
-       ((void *)((unsigned)(addr) | CONFIG_NIOS2_IO_REGION_BASE))
-# define CAC_ADDR(addr)                \
-       ((void *)(((unsigned)(addr) & ~CONFIG_NIOS2_IO_REGION_BASE) |   \
-               CONFIG_NIOS2_KERNEL_REGION_BASE))
-
 #include <asm-generic/memory_model.h>
 
 #include <asm-generic/getorder.h>

diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c
index 4af9e5b..9cb2386 100644 (file)
--- a/arch/nios2/mm/dma-mapping.c
+++ b/arch/nios2/mm/dma-mapping.c
@@ -60,32 +60,28 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
        }
 }
 
-void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
-               gfp_t gfp, unsigned long attrs)
+void arch_dma_prep_coherent(struct page *page, size_t size)
 {
-       void *ret;
+       unsigned long start = (unsigned long)page_address(page);
 
-       /* optimized page clearing */
-       gfp |= __GFP_ZERO;
+       flush_dcache_range(start, start + size);
+}
 
-       if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
-               gfp |= GFP_DMA;
+void *uncached_kernel_address(void *ptr)
+{
+       unsigned long addr = (unsigned long)ptr;
 
-       ret = (void *) __get_free_pages(gfp, get_order(size));
-       if (ret != NULL) {
-               *dma_handle = virt_to_phys(ret);
-               flush_dcache_range((unsigned long) ret,
-                       (unsigned long) ret + size);
-               ret = UNCAC_ADDR(ret);
-       }
+       addr |= CONFIG_NIOS2_IO_REGION_BASE;
 
-       return ret;
+       return (void *)ptr;
 }
 
-void arch_dma_free(struct device *dev, size_t size, void *vaddr,
-               dma_addr_t dma_handle, unsigned long attrs)
+void *cached_kernel_address(void *ptr)
 {
-       unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
+       unsigned long addr = (unsigned long)ptr;
+
+       addr &= ~CONFIG_NIOS2_IO_REGION_BASE;
+       addr |= CONFIG_NIOS2_KERNEL_REGION_BASE;
 
-       free_pages(addr, get_order(size));
+       return (void *)ptr;
 }