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Diffstat (limited to 'arch/m68k/kernel/dma_no.c')
-rw-r--r--arch/m68k/kernel/dma_no.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/m68k/kernel/dma_no.c b/arch/m68k/kernel/dma_no.c
new file mode 100644
index 00000000000..fc61541aeb7
--- /dev/null
+++ b/arch/m68k/kernel/dma_no.c
@@ -0,0 +1,74 @@
+/*
+ * Dynamic DMA mapping support.
+ *
+ * We never have any address translations to worry about, so this
+ * is just alloc/free.
+ */
+
+#include <linux/types.h>
+#include <linux/gfp.h>
+#include <linux/mm.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <asm/cacheflush.h>
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp)
+{
+ 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;
+}
+
+void dma_free_coherent(struct device *dev, size_t size,
+ void *vaddr, dma_addr_t dma_handle)
+{
+ free_pages((unsigned long)vaddr, get_order(size));
+}
+
+void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir)
+{
+ switch (dir) {
+ case DMA_TO_DEVICE:
+ flush_dcache_range(handle, size);
+ break;
+ case DMA_FROM_DEVICE:
+ /* Should be clear already */
+ break;
+ default:
+ if (printk_ratelimit())
+ printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
+ break;
+ }
+}
+
+EXPORT_SYMBOL(dma_sync_single_for_device);
+dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
+ enum dma_data_direction dir)
+{
+ dma_addr_t handle = virt_to_phys(addr);
+ flush_dcache_range(handle, size);
+ return handle;
+}
+EXPORT_SYMBOL(dma_map_single);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir)
+{
+ dma_addr_t handle = page_to_phys(page) + offset;
+ dma_sync_single_for_device(dev, handle, size, dir);
+ return handle;
+}
+EXPORT_SYMBOL(dma_map_page);