Richard Kuo | 65c3d7c | 2011-10-31 18:52:22 -0500 | [diff] [blame] | 1 | /* |
| 2 | * DMA operations for the Hexagon architecture |
| 3 | * |
| 4 | * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 and |
| 8 | * only version 2 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 18 | * 02110-1301, USA. |
| 19 | */ |
| 20 | |
| 21 | #ifndef _ASM_DMA_MAPPING_H |
| 22 | #define _ASM_DMA_MAPPING_H |
| 23 | |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/cache.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/scatterlist.h> |
| 28 | #include <linux/dma-mapping.h> |
| 29 | #include <linux/dma-debug.h> |
| 30 | #include <linux/dma-attrs.h> |
| 31 | #include <asm/io.h> |
| 32 | |
| 33 | struct device; |
| 34 | extern int bad_dma_address; |
| 35 | |
| 36 | extern struct dma_map_ops *dma_ops; |
| 37 | |
| 38 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) |
| 39 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) |
| 40 | |
| 41 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) |
| 42 | { |
| 43 | if (unlikely(dev == NULL)) |
| 44 | return NULL; |
| 45 | |
| 46 | return dma_ops; |
| 47 | } |
| 48 | |
| 49 | extern int dma_supported(struct device *dev, u64 mask); |
| 50 | extern int dma_set_mask(struct device *dev, u64 mask); |
| 51 | extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle); |
| 52 | extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
| 53 | enum dma_data_direction direction); |
| 54 | |
| 55 | #include <asm-generic/dma-mapping-common.h> |
| 56 | |
| 57 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
| 58 | { |
| 59 | if (!dev->dma_mask) |
| 60 | return 0; |
| 61 | return addr + size - 1 <= *dev->dma_mask; |
| 62 | } |
| 63 | |
| 64 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
| 65 | { |
| 66 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
| 67 | |
| 68 | if (dma_ops->mapping_error) |
| 69 | return dma_ops->mapping_error(dev, dma_addr); |
| 70 | |
| 71 | return (dma_addr == bad_dma_address); |
| 72 | } |
| 73 | |
| 74 | static inline void *dma_alloc_coherent(struct device *dev, size_t size, |
| 75 | dma_addr_t *dma_handle, gfp_t flag) |
| 76 | { |
| 77 | void *ret; |
| 78 | struct dma_map_ops *ops = get_dma_ops(dev); |
| 79 | |
| 80 | BUG_ON(!dma_ops); |
| 81 | |
| 82 | ret = ops->alloc_coherent(dev, size, dma_handle, flag); |
| 83 | |
| 84 | debug_dma_alloc_coherent(dev, size, *dma_handle, ret); |
| 85 | |
| 86 | return ret; |
| 87 | } |
| 88 | |
| 89 | static inline void dma_free_coherent(struct device *dev, size_t size, |
| 90 | void *cpu_addr, dma_addr_t dma_handle) |
| 91 | { |
| 92 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
| 93 | |
| 94 | BUG_ON(!dma_ops); |
| 95 | |
| 96 | dma_ops->free_coherent(dev, size, cpu_addr, dma_handle); |
| 97 | |
| 98 | debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); |
| 99 | } |
| 100 | |
| 101 | #endif |