| Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation, version 2. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for |
| 12 | * more details. |
| 13 | */ |
| 14 | |
| 15 | #ifndef _ASM_TILE_DMA_MAPPING_H |
| 16 | #define _ASM_TILE_DMA_MAPPING_H |
| 17 | |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/scatterlist.h> |
| 20 | #include <linux/cache.h> |
| 21 | #include <linux/io.h> |
| 22 | |
| 23 | /* |
| 24 | * Note that on x86 and powerpc, there is a "struct dma_mapping_ops" |
| 25 | * that is used for all the DMA operations. For now, we don't have an |
| 26 | * equivalent on tile, because we only have a single way of doing DMA. |
| 27 | * (Tilera bug 7994 to use dma_mapping_ops.) |
| 28 | */ |
| 29 | |
| 30 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) |
| 31 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) |
| 32 | |
| 33 | extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, |
| 34 | enum dma_data_direction); |
| 35 | extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, |
| 36 | size_t size, enum dma_data_direction); |
| 37 | extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 38 | enum dma_data_direction); |
| 39 | extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg, |
| 40 | int nhwentries, enum dma_data_direction); |
| 41 | extern dma_addr_t dma_map_page(struct device *dev, struct page *page, |
| 42 | unsigned long offset, size_t size, |
| 43 | enum dma_data_direction); |
| 44 | extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address, |
| 45 | size_t size, enum dma_data_direction); |
| 46 | extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
| 47 | int nelems, enum dma_data_direction); |
| 48 | extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
| 49 | int nelems, enum dma_data_direction); |
| 50 | |
| 51 | |
| 52 | void *dma_alloc_coherent(struct device *dev, size_t size, |
| 53 | dma_addr_t *dma_handle, gfp_t flag); |
| 54 | |
| 55 | void dma_free_coherent(struct device *dev, size_t size, |
| 56 | void *vaddr, dma_addr_t dma_handle); |
| 57 | |
| 58 | extern void dma_sync_single_for_cpu(struct device *, dma_addr_t, size_t, |
| 59 | enum dma_data_direction); |
| 60 | extern void dma_sync_single_for_device(struct device *, dma_addr_t, |
| 61 | size_t, enum dma_data_direction); |
| 62 | extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t, |
| 63 | unsigned long offset, size_t, |
| 64 | enum dma_data_direction); |
| 65 | extern void dma_sync_single_range_for_device(struct device *, dma_addr_t, |
| 66 | unsigned long offset, size_t, |
| 67 | enum dma_data_direction); |
| 68 | extern void dma_cache_sync(void *vaddr, size_t, enum dma_data_direction); |
| 69 | |
| 70 | static inline int |
| 71 | dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
| 72 | { |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static inline int |
| 77 | dma_supported(struct device *dev, u64 mask) |
| 78 | { |
| 79 | return 1; |
| 80 | } |
| 81 | |
| 82 | static inline int |
| 83 | dma_set_mask(struct device *dev, u64 mask) |
| 84 | { |
| 85 | if (!dev->dma_mask || !dma_supported(dev, mask)) |
| 86 | return -EIO; |
| 87 | |
| 88 | *dev->dma_mask = mask; |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static inline int |
| 94 | dma_get_cache_alignment(void) |
| 95 | { |
| 96 | return L2_CACHE_BYTES; |
| 97 | } |
| 98 | |
| 99 | #define dma_is_consistent(d, h) (1) |
| 100 | |
| 101 | |
| 102 | #endif /* _ASM_TILE_DMA_MAPPING_H */ |