These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / h8300 / kernel / dma.c

diff --git a/kernel/arch/h8300/kernel/dma.c b/kernel/arch/h8300/kernel/dma.c
new file mode 100644 (file)
index 0000000..eeb13d3
--- /dev/null
+++ b/kernel/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);