Linux-libre 4.2-gnu

1 files changed, 69 insertions, 0 deletions

diff --git a/arch/h8300/kernel/dma.c b/arch/h8300/kernel/dma.c
new file mode 100644
index 000000000..eeb13d3f2
--- /dev/null
+++ b/arch/h8300/kernel/dma.c
@@ -0,0 +1,69 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/scatterlist.h>
+#include <linux/module.h>
+#include <asm/pgalloc.h>
+
+static void *dma_alloc(struct device *dev, size_t size,
+		       dma_addr_t *dma_handle, gfp_t gfp,
+		       struct dma_attrs *attrs)
+{
+	void *ret;
+
+	/* ignore region specifiers */
+	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+	if (dev == NULL || (*dev->dma_mask < 0xffffffff))
+		gfp |= GFP_DMA;
+	ret = (void *)__get_free_pages(gfp, get_order(size));
+
+	if (ret != NULL) {
+		memset(ret, 0, size);
+		*dma_handle = virt_to_phys(ret);
+	}
+	return ret;
+}
+
+static void dma_free(struct device *dev, size_t size,
+		     void *vaddr, dma_addr_t dma_handle,
+		     struct dma_attrs *attrs)
+
+{
+	free_pages((unsigned long)vaddr, get_order(size));
+}
+
+static dma_addr_t map_page(struct device *dev, struct page *page,
+				  unsigned long offset, size_t size,
+				  enum dma_data_direction direction,
+				  struct dma_attrs *attrs)
+{
+	return page_to_phys(page) + offset;
+}
+
+static int map_sg(struct device *dev, struct scatterlist *sgl,
+		  int nents, enum dma_data_direction direction,
+		  struct dma_attrs *attrs)
+{
+	struct scatterlist *sg;
+	int i;
+
+	for_each_sg(sgl, sg, nents, i) {
+		sg->dma_address = sg_phys(sg);
+	}
+
+	return nents;
+}
+
+struct dma_map_ops h8300_dma_map_ops = {
+	.alloc = dma_alloc,
+	.free = dma_free,
+	.map_page = map_page,
+	.map_sg = map_sg,
+};
+EXPORT_SYMBOL(h8300_dma_map_ops);