172 lines
4.2 KiB
C
172 lines
4.2 KiB
C
/*
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* include/asm-xtensa/dma-mapping.h
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2003 - 2005 Tensilica Inc.
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*/
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#ifndef _XTENSA_DMA_MAPPING_H
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#define _XTENSA_DMA_MAPPING_H
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#include <asm/cache.h>
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#include <asm/io.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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/*
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* DMA-consistent mapping functions.
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*/
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extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long);
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extern void consistent_free(void*, size_t, dma_addr_t);
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extern void consistent_sync(void*, size_t, int);
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#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
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#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
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void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag);
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void dma_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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static inline dma_addr_t
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dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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consistent_sync(ptr, size, direction);
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return virt_to_phys(ptr);
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}
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static inline void
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dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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}
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static inline int
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dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction)
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{
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int i;
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BUG_ON(direction == DMA_NONE);
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for (i = 0; i < nents; i++, sg++ ) {
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BUG_ON(!sg_page(sg));
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sg->dma_address = sg_phys(sg);
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consistent_sync(sg_virt(sg), sg->length, direction);
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}
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return nents;
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}
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static inline dma_addr_t
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dma_map_page(struct device *dev, struct page *page, unsigned long offset,
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size_t size, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
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}
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static inline void
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dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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}
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static inline void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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}
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static inline void
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dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
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}
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static inline void
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dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
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}
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static inline void
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dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
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}
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static inline void
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dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction dir)
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{
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int i;
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for (i = 0; i < nelems; i++, sg++)
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consistent_sync(sg_virt(sg), sg->length, dir);
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}
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static inline void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction dir)
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{
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int i;
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for (i = 0; i < nelems; i++, sg++)
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consistent_sync(sg_virt(sg), sg->length, dir);
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}
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static inline int
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dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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{
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return 0;
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}
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static inline int
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dma_supported(struct device *dev, u64 mask)
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{
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return 1;
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}
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static inline int
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dma_set_mask(struct device *dev, u64 mask)
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{
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if(!dev->dma_mask || !dma_supported(dev, mask))
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return -EIO;
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*dev->dma_mask = mask;
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return 0;
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}
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static inline void
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dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction)
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{
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consistent_sync(vaddr, size, direction);
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}
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#endif /* _XTENSA_DMA_MAPPING_H */
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