[PATCH] m68knommu: coherent dma allocation

From: <gerg@snapgear.com>

Create the coherent DMA allocation functions for m68knommu.  No current
hardware in this class requires anything special, so it just just does
normal allocations after sanity checks.

arch/m68knommu/kernel/dma.c

+/*
+ * 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/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+			   dma_addr_t *dma_handle, int 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));
+}