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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /arch/h8300/kernel/dma.c
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'arch/h8300/kernel/dma.c')
-rw-r--r--arch/h8300/kernel/dma.c69
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);