1 files changed, 151 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c
new file mode 100644
index 0000000..7c34196
--- /dev/null
+++ b/arch/powerpc/kernel/dma_64.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2004 IBM Corporation
+ *
+ * Implements the generic device dma API for ppc64. Handles
+ * the pci and vio busses
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+/* Include the busses we support */
+#include <linux/pci.h>
+#include <asm/vio.h>
+#include <asm/scatterlist.h>
+#include <asm/bug.h>
+
+static struct dma_mapping_ops *get_dma_ops(struct device *dev)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type)
+		return &pci_dma_ops;
+#endif
+#ifdef CONFIG_IBMVIO
+	if (dev->bus == &vio_bus_type)
+		return &vio_dma_ops;
+#endif
+	return NULL;
+}
+
+int dma_supported(struct device *dev, u64 mask)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		return dma_ops->dma_supported(dev, mask);
+	BUG();
+	return 0;
+}
+EXPORT_SYMBOL(dma_supported);
+
+int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type)
+		return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
+#endif
+#ifdef CONFIG_IBMVIO
+	if (dev->bus == &vio_bus_type)
+		return -EIO;
+#endif /* CONFIG_IBMVIO */
+	BUG();
+	return 0;
+}
+EXPORT_SYMBOL(dma_set_mask);
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+		dma_addr_t *dma_handle, gfp_t flag)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
+	BUG();
+	return NULL;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
+		dma_addr_t dma_handle)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
+	else
+		BUG();
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, size_t size,
+		enum dma_data_direction direction)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		return dma_ops->map_single(dev, cpu_addr, size, direction);
+	BUG();
+	return (dma_addr_t)0;
+}
+EXPORT_SYMBOL(dma_map_single);
+
+void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
+		enum dma_data_direction direction)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		dma_ops->unmap_single(dev, dma_addr, size, direction);
+	else
+		BUG();
+}
+EXPORT_SYMBOL(dma_unmap_single);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+		unsigned long offset, size_t size,
+		enum dma_data_direction direction)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		return dma_ops->map_single(dev,
+				(page_address(page) + offset), size, direction);
+	BUG();
+	return (dma_addr_t)0;
+}
+EXPORT_SYMBOL(dma_map_page);
+
+void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
+		enum dma_data_direction direction)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		dma_ops->unmap_single(dev, dma_address, size, direction);
+	else
+		BUG();
+}
+EXPORT_SYMBOL(dma_unmap_page);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+		enum dma_data_direction direction)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		return dma_ops->map_sg(dev, sg, nents, direction);
+	BUG();
+	return 0;
+}
+EXPORT_SYMBOL(dma_map_sg);
+
+void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
+		enum dma_data_direction direction)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (dma_ops)
+		dma_ops->unmap_sg(dev, sg, nhwentries, direction);
+	else
+		BUG();
+}
+EXPORT_SYMBOL(dma_unmap_sg);