1 files changed, 125 insertions, 0 deletions
diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c
new file mode 100644
index 000000000..e99993c57
--- /dev/null
+++ b/arch/m68k/kernel/dma.c
@@ -0,0 +1,125 @@
+/*
+ * 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.
+ */
+
+#undef DEBUG
+
+#include <linux/dma-noncoherent.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/export.h>
+
+#include <asm/pgalloc.h>
+
+#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
+
+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
+		gfp_t flag, unsigned long attrs)
+{
+	struct page *page, **map;
+	pgprot_t pgprot;
+	void *addr;
+	int i, order;
+
+	pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
+
+	size = PAGE_ALIGN(size);
+	order = get_order(size);
+
+	page = alloc_pages(flag, order);
+	if (!page)
+		return NULL;
+
+	*handle = page_to_phys(page);
+	map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
+	if (!map) {
+		__free_pages(page, order);
+		return NULL;
+	}
+	split_page(page, order);
+
+	order = 1 << order;
+	size >>= PAGE_SHIFT;
+	map[0] = page;
+	for (i = 1; i < size; i++)
+		map[i] = page + i;
+	for (; i < order; i++)
+		__free_page(page + i);
+	pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
+	if (CPU_IS_040_OR_060)
+		pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
+	else
+		pgprot_val(pgprot) |= _PAGE_NOCACHE030;
+	addr = vmap(map, size, VM_MAP, pgprot);
+	kfree(map);
+
+	return addr;
+}
+
+void arch_dma_free(struct device *dev, size_t size, void *addr,
+		dma_addr_t handle, unsigned long attrs)
+{
+	pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
+	vfree(addr);
+}
+
+#else
+
+#include <asm/cacheflush.h>
+
+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
+		gfp_t gfp, unsigned long attrs)
+{
+	void *ret;
+
+	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 arch_dma_free(struct device *dev, size_t size, void *vaddr,
+		dma_addr_t dma_handle, unsigned long attrs)
+{
+	free_pages((unsigned long)vaddr, get_order(size));
+}
+
+#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
+
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t handle,
+		size_t size, enum dma_data_direction dir)
+{
+	switch (dir) {
+	case DMA_BIDIRECTIONAL:
+	case DMA_TO_DEVICE:
+		cache_push(handle, size);
+		break;
+	case DMA_FROM_DEVICE:
+		cache_clear(handle, size);
+		break;
+	default:
+		pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
+				   dir);
+		break;
+	}
+}
+
+void arch_setup_pdev_archdata(struct platform_device *pdev)
+{
+	if (pdev->dev.coherent_dma_mask == DMA_MASK_NONE &&
+	    pdev->dev.dma_mask == NULL) {
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	}
+}