ARC: dma: implement dma_unmap_page and sg variant

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
index 2a07e6e..1d0326d 100644 (file)
--- a/arch/arc/mm/dma.c
+++ b/arch/arc/mm/dma.c
@@ -153,6 +153,19 @@ static void _dma_cache_sync(phys_addr_t paddr, size_t size,
        }
 }
 
+/*
+ * arc_dma_map_page - map a portion of a page for streaming DMA
+ *
+ * Ensure that any data held in the cache is appropriately discarded
+ * or written back.
+ *
+ * The device owns this memory once this call has completed.  The CPU
+ * can regain ownership by calling dma_unmap_page().
+ *
+ * Note: while it takes struct page as arg, caller can "abuse" it to pass
+ * a region larger than PAGE_SIZE, provided it is physically contiguous
+ * and this still works correctly
+ */
 static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page,
                unsigned long offset, size_t size, enum dma_data_direction dir,
                unsigned long attrs)
@@ -165,6 +178,24 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page,
        return plat_phys_to_dma(dev, paddr);
 }
 
+/*
+ * arc_dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
+ *
+ * After this call, reads by the CPU to the buffer are guaranteed to see
+ * whatever the device wrote there.
+ *
+ * Note: historically this routine was not implemented for ARC
+ */
+static void arc_dma_unmap_page(struct device *dev, dma_addr_t handle,
+                              size_t size, enum dma_data_direction dir,
+                              unsigned long attrs)
+{
+       phys_addr_t paddr = plat_dma_to_phys(dev, handle);
+
+       if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+               _dma_cache_sync(paddr, size, dir);
+}
+
 static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg,
           int nents, enum dma_data_direction dir, unsigned long attrs)
 {
@@ -178,6 +209,18 @@ static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg,
        return nents;
 }
 
+static void arc_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+                            int nents, enum dma_data_direction dir,
+                            unsigned long attrs)
+{
+       struct scatterlist *s;
+       int i;
+
+       for_each_sg(sg, s, nents, i)
+               arc_dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir,
+                                  attrs);
+}
+
 static void arc_dma_sync_single_for_cpu(struct device *dev,
                dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
 {
@@ -223,7 +266,9 @@ const struct dma_map_ops arc_dma_ops = {
        .free                   = arc_dma_free,
        .mmap                   = arc_dma_mmap,
        .map_page               = arc_dma_map_page,
+       .unmap_page             = arc_dma_unmap_page,
        .map_sg                 = arc_dma_map_sg,
+       .unmap_sg               = arc_dma_unmap_sg,
        .sync_single_for_device = arc_dma_sync_single_for_device,
        .sync_single_for_cpu    = arc_dma_sync_single_for_cpu,
        .sync_sg_for_cpu        = arc_dma_sync_sg_for_cpu,