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- /* Copyright (C) 2002 by James.Bottomley@HansenPartnership.com
- *
- * Implements the generic device dma API via the existing pci_ one
- * for unconverted architectures
- */
-
- #ifndef _ASM_GENERIC_DMA_MAPPING_H
- #define _ASM_GENERIC_DMA_MAPPING_H
-
- #include <linux/config.h>
-
- #ifdef CONFIG_PCI
-
- /* we implement the API below in terms of the existing PCI one,
- * so include it */
- #include <linux/pci.h>
- /* need struct page definitions */
- #include <linux/mm.h>
-
- static inline int
- dma_supported(struct device *dev, u64 mask)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- return pci_dma_supported(to_pci_dev(dev), mask);
- }
-
- static inline int
- dma_set_mask(struct device *dev, u64 dma_mask)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
- }
-
- static inline void *
- dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
- int flag)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
- }
-
- static inline void
- dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t dma_handle)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- pci_free_consistent(to_pci_dev(dev), size, cpu_addr, dma_handle);
- }
-
- static inline dma_addr_t
- dma_map_single(struct device *dev, void *cpu_addr, size_t size,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- return pci_map_single(to_pci_dev(dev), cpu_addr, size, (int)direction);
- }
-
- static inline void
- dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- pci_unmap_single(to_pci_dev(dev), dma_addr, size, (int)direction);
- }
-
- static inline dma_addr_t
- dma_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- return pci_map_page(to_pci_dev(dev), page, offset, size, (int)direction);
- }
-
- static inline void
- dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- pci_unmap_page(to_pci_dev(dev), dma_address, size, (int)direction);
- }
-
- static inline int
- dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
- }
-
- static inline void
- dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- pci_unmap_sg(to_pci_dev(dev), sg, nhwentries, (int)direction);
- }
-
- static inline void
- dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
- size, (int)direction);
- }
-
- static inline void
- dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
- size, (int)direction);
- }
-
- static inline void
- dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg, nelems, (int)direction);
- }
-
- static inline void
- dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
- enum dma_data_direction direction)
- {
- BUG_ON(dev->bus != &pci_bus_type);
-
- pci_dma_sync_sg_for_device(to_pci_dev(dev), sg, nelems, (int)direction);
- }
-
- static inline int
- dma_mapping_error(dma_addr_t dma_addr)
- {
- return pci_dma_mapping_error(dma_addr);
- }
-
-
- #else
-
- static inline int
- dma_supported(struct device *dev, u64 mask)
- {
- return 0;
- }
-
- static inline int
- dma_set_mask(struct device *dev, u64 dma_mask)
- {
- BUG();
- return 0;
- }
-
- static inline void *
- dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
- int flag)
- {
- BUG();
- return NULL;
- }
-
- static inline void
- dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t dma_handle)
- {
- BUG();
- }
-
- static inline dma_addr_t
- dma_map_single(struct device *dev, void *cpu_addr, size_t size,
- enum dma_data_direction direction)
- {
- BUG();
- return 0;
- }
-
- static inline void
- dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction direction)
- {
- BUG();
- }
-
- static inline dma_addr_t
- dma_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction direction)
- {
- BUG();
- return 0;
- }
-
- static inline void
- dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
- enum dma_data_direction direction)
- {
- BUG();
- }
-
- static inline int
- dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction direction)
- {
- BUG();
- return 0;
- }
-
- static inline void
- dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
- enum dma_data_direction direction)
- {
- BUG();
- }
-
- static inline void
- dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
- enum dma_data_direction direction)
- {
- BUG();
- }
-
- static inline void
- dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
- enum dma_data_direction direction)
- {
- BUG();
- }
-
- static inline void
- dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
- enum dma_data_direction direction)
- {
- BUG();
- }
-
- static inline void
- dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
- enum dma_data_direction direction)
- {
- BUG();
- }
-
- static inline int
- dma_error(dma_addr_t dma_addr)
- {
- return 0;
- }
-
- #endif
-
- /* Now for the API extensions over the pci_ one */
-
- #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
- #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
- #define dma_is_consistent(d) (1)
-
- static inline int
- dma_get_cache_alignment(void)
- {
- /* no easy way to get cache size on all processors, so return
- * the maximum possible, to be safe */
- return (1 << L1_CACHE_SHIFT_MAX);
- }
-
- static inline 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)
- {
- /* just sync everything, that's all the pci API can do */
- dma_sync_single_for_cpu(dev, dma_handle, offset+size, direction);
- }
-
- static inline 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)
- {
- /* just sync everything, that's all the pci API can do */
- dma_sync_single_for_device(dev, dma_handle, offset+size, direction);
- }
-
- static inline void
- dma_cache_sync(void *vaddr, size_t size,
- enum dma_data_direction direction)
- {
- /* could define this in terms of the dma_cache ... operations,
- * but if you get this on a platform, you should convert the platform
- * to using the generic device DMA API */
- BUG();
- }
-
- #endif
-
-