| GuanXuetao | 10c9c10 | 2011-01-15 18:18:29 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/unicore32/include/asm/dma-mapping.h |
| 3 | * |
| 4 | * Code specific to PKUnity SoC and UniCore ISA |
| 5 | * |
| 6 | * Copyright (C) 2001-2010 GUAN Xue-tao |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | #ifndef __UNICORE_DMA_MAPPING_H__ |
| 13 | #define __UNICORE_DMA_MAPPING_H__ |
| 14 | |
| 15 | #ifdef __KERNEL__ |
| 16 | |
| 17 | #include <linux/mm_types.h> |
| 18 | #include <linux/scatterlist.h> |
| 19 | #include <linux/swiotlb.h> |
| 20 | |
| GuanXuetao | 10c9c10 | 2011-01-15 18:18:29 +0800 | [diff] [blame] | 21 | #include <asm/memory.h> |
| 22 | #include <asm/cacheflush.h> |
| 23 | |
| 24 | extern struct dma_map_ops swiotlb_dma_map_ops; |
| 25 | |
| 26 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) |
| 27 | { |
| 28 | return &swiotlb_dma_map_ops; |
| 29 | } |
| 30 | |
| 31 | static inline int dma_supported(struct device *dev, u64 mask) |
| 32 | { |
| 33 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
| 34 | |
| 35 | if (unlikely(dma_ops == NULL)) |
| 36 | return 0; |
| 37 | |
| 38 | return dma_ops->dma_supported(dev, mask); |
| 39 | } |
| 40 | |
| 41 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
| 42 | { |
| 43 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
| 44 | |
| 45 | if (dma_ops->mapping_error) |
| 46 | return dma_ops->mapping_error(dev, dma_addr); |
| 47 | |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | #include <asm-generic/dma-mapping-common.h> |
| 52 | |
| 53 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
| 54 | { |
| 55 | if (dev && dev->dma_mask) |
| 56 | return addr + size - 1 <= *dev->dma_mask; |
| 57 | |
| 58 | return 1; |
| 59 | } |
| 60 | |
| 61 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
| 62 | { |
| 63 | return paddr; |
| 64 | } |
| 65 | |
| 66 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) |
| 67 | { |
| 68 | return daddr; |
| 69 | } |
| 70 | |
| 71 | static inline void dma_mark_clean(void *addr, size_t size) {} |
| 72 | |
| 73 | static inline int dma_set_mask(struct device *dev, u64 dma_mask) |
| 74 | { |
| 75 | if (!dev->dma_mask || !dma_supported(dev, dma_mask)) |
| 76 | return -EIO; |
| 77 | |
| 78 | *dev->dma_mask = dma_mask; |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| GuanXuetao | 10c9c10 | 2011-01-15 18:18:29 +0800 | [diff] [blame] | 83 | static inline void dma_cache_sync(struct device *dev, void *vaddr, |
| 84 | size_t size, enum dma_data_direction direction) |
| 85 | { |
| 86 | unsigned long start = (unsigned long)vaddr; |
| 87 | unsigned long end = start + size; |
| 88 | |
| 89 | switch (direction) { |
| 90 | case DMA_NONE: |
| 91 | BUG(); |
| 92 | case DMA_FROM_DEVICE: |
| 93 | case DMA_BIDIRECTIONAL: /* writeback and invalidate */ |
| 94 | __cpuc_dma_flush_range(start, end); |
| 95 | break; |
| 96 | case DMA_TO_DEVICE: /* writeback only */ |
| 97 | __cpuc_dma_clean_range(start, end); |
| 98 | break; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | #endif /* __KERNEL__ */ |
| 103 | #endif |