sparc32: Implement more generic dma_*() interfaces.

These dispatch to either PCI or SBUS routines based upon
the device bus type.

This will allow us to let SBUS drivers call these routines.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 227 insertions, 0 deletions

diff --git a/arch/sparc/kernel/dma.c b/arch/sparc/kernel/dma.c
new file mode 100644
index 000000000000..ebc8403b035e
--- /dev/null
+++ b/arch/sparc/kernel/dma.c
@@ -0,0 +1,227 @@
+/* dma.c: PCI and SBUS DMA accessors for 32-bit sparc.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+#include <linux/mm.h>
+
+#ifdef CONFIG_PCI
+#include <linux/pci.h>
+#endif
+
+#include "dma.h"
+
+int dma_supported(struct device *dev, u64 mask)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type)
+		return pci_dma_supported(to_pci_dev(dev), mask);
+#endif
+	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
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(dma_set_mask);
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+			 dma_addr_t *dma_handle, gfp_t flag)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type)
+		return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
+#endif
+	return sbus_alloc_consistent(dev, size, dma_handle);
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_coherent(struct device *dev, size_t size,
+		       void *cpu_addr, dma_addr_t dma_handle)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type) {
+		pci_free_consistent(to_pci_dev(dev), size,
+				    cpu_addr, dma_handle);
+		return;
+	}
+#endif
+	sbus_free_consistent(dev, size, cpu_addr, dma_handle);
+}
+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)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type)
+		return pci_map_single(to_pci_dev(dev), cpu_addr,
+				      size, (int)direction);
+#endif
+	return sbus_map_single(dev, cpu_addr, size, (int)direction);
+}
+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)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type) {
+		pci_unmap_single(to_pci_dev(dev), dma_addr,
+				 size, (int)direction);
+		return;
+	}
+#endif
+	sbus_unmap_single(dev, dma_addr, size, (int)direction);
+}
+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)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type)
+		return pci_map_page(to_pci_dev(dev), page, offset,
+				    size, (int)direction);
+#endif
+	return sbus_map_single(dev, page_address(page) + offset,
+			       size, (int)direction);
+}
+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)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type) {
+		pci_unmap_page(to_pci_dev(dev), dma_address,
+			       size, (int)direction);
+		return;
+	}
+#endif
+	sbus_unmap_single(dev, dma_address, size, (int)direction);
+}
+EXPORT_SYMBOL(dma_unmap_page);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sg,
+			     int nents, enum dma_data_direction direction)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type)
+		return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
+#endif
+	return sbus_map_sg(dev, sg, nents, direction);
+}
+EXPORT_SYMBOL(dma_map_sg);
+
+void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+		  int nents, enum dma_data_direction direction)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type) {
+		pci_unmap_sg(to_pci_dev(dev), sg, nents, (int)direction);
+		return;
+	}
+#endif
+	sbus_unmap_sg(dev, sg, nents, (int)direction);
+}
+EXPORT_SYMBOL(dma_unmap_sg);
+
+void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+			     size_t size, enum dma_data_direction direction)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type) {
+		pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
+					    size, (int)direction);
+		return;
+	}
+#endif
+	sbus_dma_sync_single_for_cpu(dev, dma_handle, size, (int) direction);
+}
+EXPORT_SYMBOL(dma_sync_single_for_cpu);
+
+void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+				size_t size, enum dma_data_direction direction)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type) {
+		pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
+					       size, (int)direction);
+		return;
+	}
+#endif
+	sbus_dma_sync_single_for_device(dev, dma_handle, size, (int) direction);
+}
+EXPORT_SYMBOL(dma_sync_single_for_device);
+
+void dma_sync_single_range_for_cpu(struct device *dev,
+				   dma_addr_t dma_handle,
+				   unsigned long offset,
+				   size_t size,
+				   enum dma_data_direction direction)
+{
+	dma_sync_single_for_cpu(dev, dma_handle+offset, size, direction);
+}
+EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
+
+void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
+				      unsigned long offset, size_t size,
+				      enum dma_data_direction direction)
+{
+	dma_sync_single_for_device(dev, dma_handle+offset, size, direction);
+}
+EXPORT_SYMBOL(dma_sync_single_range_for_device);
+
+void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
+			 int nelems, enum dma_data_direction direction)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type) {
+		pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg,
+					nelems, (int)direction);
+		return;
+	}
+#endif
+	BUG();
+}
+EXPORT_SYMBOL(dma_sync_sg_for_cpu);
+
+void dma_sync_sg_for_device(struct device *dev,
+			    struct scatterlist *sg, int nelems,
+			    enum dma_data_direction direction)
+{
+#ifdef CONFIG_PCI
+	if (dev->bus == &pci_bus_type) {
+		pci_dma_sync_sg_for_device(to_pci_dev(dev), sg,
+					   nelems, (int)direction);
+		return;
+	}
+#endif
+	BUG();
+}
+EXPORT_SYMBOL(dma_sync_sg_for_device);
+
+int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+	return (dma_addr == DMA_ERROR_CODE);
+}
+EXPORT_SYMBOL(dma_mapping_error);
+
+int dma_get_cache_alignment(void)
+{
+	return 32;
+}
+EXPORT_SYMBOL(dma_get_cache_alignment);