diff options
Diffstat (limited to 'arch/tile/include/asm/dma-mapping.h')
-rw-r--r-- | arch/tile/include/asm/dma-mapping.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h new file mode 100644 index 00000000000..cf466b39aa1 --- /dev/null +++ b/arch/tile/include/asm/dma-mapping.h @@ -0,0 +1,102 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_DMA_MAPPING_H +#define _ASM_TILE_DMA_MAPPING_H + +#include <linux/mm.h> +#include <linux/scatterlist.h> +#include <linux/cache.h> +#include <linux/io.h> + +/* + * Note that on x86 and powerpc, there is a "struct dma_mapping_ops" + * that is used for all the DMA operations. For now, we don't have an + * equivalent on tile, because we only have a single way of doing DMA. + * (Tilera bug 7994 to use dma_mapping_ops.) + */ + +#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) + +extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, + enum dma_data_direction); +extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, + size_t size, enum dma_data_direction); +extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction); +extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg, + int nhwentries, enum dma_data_direction); +extern dma_addr_t dma_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction); +extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address, + size_t size, enum dma_data_direction); +extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, + int nelems, enum dma_data_direction); +extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, + int nelems, enum dma_data_direction); + + +void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag); + +void dma_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle); + +extern void dma_sync_single_for_cpu(struct device *, dma_addr_t, size_t, + enum dma_data_direction); +extern void dma_sync_single_for_device(struct device *, dma_addr_t, + size_t, enum dma_data_direction); +extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t, + unsigned long offset, size_t, + enum dma_data_direction); +extern void dma_sync_single_range_for_device(struct device *, dma_addr_t, + unsigned long offset, size_t, + enum dma_data_direction); +extern void dma_cache_sync(void *vaddr, size_t, enum dma_data_direction); + +static inline int +dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return 0; +} + +static inline int +dma_supported(struct device *dev, u64 mask) +{ + return 1; +} + +static inline int +dma_set_mask(struct device *dev, u64 mask) +{ + if (!dev->dma_mask || !dma_supported(dev, mask)) + return -EIO; + + *dev->dma_mask = mask; + + return 0; +} + +static inline int +dma_get_cache_alignment(void) +{ + return L2_CACHE_BYTES; +} + +#define dma_is_consistent(d, h) (1) + + +#endif /* _ASM_TILE_DMA_MAPPING_H */ |