Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 1 | /* |
| 2 | * DMA Mapping glue for ARC |
| 3 | * |
| 4 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| 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 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #ifndef ASM_ARC_DMA_MAPPING_H |
| 12 | #define ASM_ARC_DMA_MAPPING_H |
| 13 | |
| 14 | #include <asm-generic/dma-coherent.h> |
| 15 | #include <asm/cacheflush.h> |
Vineet Gupta | fc7943d | 2013-01-22 16:53:57 +0530 | [diff] [blame] | 16 | |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 17 | void *dma_alloc_noncoherent(struct device *dev, size_t size, |
| 18 | dma_addr_t *dma_handle, gfp_t gfp); |
| 19 | |
| 20 | void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, |
| 21 | dma_addr_t dma_handle); |
| 22 | |
| 23 | void *dma_alloc_coherent(struct device *dev, size_t size, |
| 24 | dma_addr_t *dma_handle, gfp_t gfp); |
| 25 | |
| 26 | void dma_free_coherent(struct device *dev, size_t size, void *kvaddr, |
| 27 | dma_addr_t dma_handle); |
| 28 | |
| 29 | /* drivers/base/dma-mapping.c */ |
| 30 | extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, |
| 31 | void *cpu_addr, dma_addr_t dma_addr, size_t size); |
| 32 | extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, |
| 33 | void *cpu_addr, dma_addr_t dma_addr, |
| 34 | size_t size); |
| 35 | |
| 36 | #define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s) |
| 37 | #define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s) |
| 38 | |
| 39 | /* |
| 40 | * streaming DMA Mapping API... |
| 41 | * CPU accesses page via normal paddr, thus needs to explicitly made |
| 42 | * consistent before each use |
| 43 | */ |
| 44 | |
| 45 | static inline void __inline_dma_cache_sync(unsigned long paddr, size_t size, |
| 46 | enum dma_data_direction dir) |
| 47 | { |
| 48 | switch (dir) { |
| 49 | case DMA_FROM_DEVICE: |
| 50 | dma_cache_inv(paddr, size); |
| 51 | break; |
| 52 | case DMA_TO_DEVICE: |
| 53 | dma_cache_wback(paddr, size); |
| 54 | break; |
| 55 | case DMA_BIDIRECTIONAL: |
| 56 | dma_cache_wback_inv(paddr, size); |
| 57 | break; |
| 58 | default: |
| 59 | pr_err("Invalid DMA dir [%d] for OP @ %lx\n", dir, paddr); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | void __arc_dma_cache_sync(unsigned long paddr, size_t size, |
| 64 | enum dma_data_direction dir); |
| 65 | |
| 66 | #define _dma_cache_sync(addr, sz, dir) \ |
| 67 | do { \ |
| 68 | if (__builtin_constant_p(dir)) \ |
| 69 | __inline_dma_cache_sync(addr, sz, dir); \ |
| 70 | else \ |
| 71 | __arc_dma_cache_sync(addr, sz, dir); \ |
| 72 | } \ |
| 73 | while (0); |
| 74 | |
| 75 | static inline dma_addr_t |
| 76 | dma_map_single(struct device *dev, void *cpu_addr, size_t size, |
| 77 | enum dma_data_direction dir) |
| 78 | { |
| 79 | _dma_cache_sync((unsigned long)cpu_addr, size, dir); |
Vineet Gupta | 454bfda | 2015-04-16 21:04:49 +0530 | [diff] [blame] | 80 | return (dma_addr_t)cpu_addr; |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | static inline void |
| 84 | dma_unmap_single(struct device *dev, dma_addr_t dma_addr, |
| 85 | size_t size, enum dma_data_direction dir) |
| 86 | { |
| 87 | } |
| 88 | |
| 89 | static inline dma_addr_t |
| 90 | dma_map_page(struct device *dev, struct page *page, |
| 91 | unsigned long offset, size_t size, |
| 92 | enum dma_data_direction dir) |
| 93 | { |
| 94 | unsigned long paddr = page_to_phys(page) + offset; |
| 95 | return dma_map_single(dev, (void *)paddr, size, dir); |
| 96 | } |
| 97 | |
| 98 | static inline void |
| 99 | dma_unmap_page(struct device *dev, dma_addr_t dma_handle, |
| 100 | size_t size, enum dma_data_direction dir) |
| 101 | { |
| 102 | } |
| 103 | |
| 104 | static inline int |
| 105 | dma_map_sg(struct device *dev, struct scatterlist *sg, |
| 106 | int nents, enum dma_data_direction dir) |
| 107 | { |
| 108 | struct scatterlist *s; |
| 109 | int i; |
| 110 | |
| 111 | for_each_sg(sg, s, nents, i) |
Pierrick Hascoet | 2105fd5 | 2013-03-18 17:04:45 +0100 | [diff] [blame] | 112 | s->dma_address = dma_map_page(dev, sg_page(s), s->offset, |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 113 | s->length, dir); |
| 114 | |
| 115 | return nents; |
| 116 | } |
| 117 | |
| 118 | static inline void |
| 119 | dma_unmap_sg(struct device *dev, struct scatterlist *sg, |
| 120 | int nents, enum dma_data_direction dir) |
| 121 | { |
| 122 | struct scatterlist *s; |
| 123 | int i; |
| 124 | |
| 125 | for_each_sg(sg, s, nents, i) |
| 126 | dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir); |
| 127 | } |
| 128 | |
| 129 | static inline void |
| 130 | dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| 131 | size_t size, enum dma_data_direction dir) |
| 132 | { |
Vineet Gupta | 454bfda | 2015-04-16 21:04:49 +0530 | [diff] [blame] | 133 | _dma_cache_sync(dma_handle, size, DMA_FROM_DEVICE); |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | static inline void |
| 137 | dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, |
| 138 | size_t size, enum dma_data_direction dir) |
| 139 | { |
Vineet Gupta | 454bfda | 2015-04-16 21:04:49 +0530 | [diff] [blame] | 140 | _dma_cache_sync(dma_handle, size, DMA_TO_DEVICE); |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | static inline void |
| 144 | dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| 145 | unsigned long offset, size_t size, |
| 146 | enum dma_data_direction direction) |
| 147 | { |
Vineet Gupta | 454bfda | 2015-04-16 21:04:49 +0530 | [diff] [blame] | 148 | _dma_cache_sync(dma_handle + offset, size, DMA_FROM_DEVICE); |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | static inline void |
| 152 | dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, |
| 153 | unsigned long offset, size_t size, |
| 154 | enum dma_data_direction direction) |
| 155 | { |
Vineet Gupta | 454bfda | 2015-04-16 21:04:49 +0530 | [diff] [blame] | 156 | _dma_cache_sync(dma_handle + offset, size, DMA_TO_DEVICE); |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | static inline void |
Akinobu Mita | 92ed932 | 2015-06-30 14:58:30 -0700 | [diff] [blame] | 160 | dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nelems, |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 161 | enum dma_data_direction dir) |
| 162 | { |
| 163 | int i; |
Akinobu Mita | 92ed932 | 2015-06-30 14:58:30 -0700 | [diff] [blame] | 164 | struct scatterlist *sg; |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 165 | |
Akinobu Mita | 92ed932 | 2015-06-30 14:58:30 -0700 | [diff] [blame] | 166 | for_each_sg(sglist, sg, nelems, i) |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 167 | _dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir); |
| 168 | } |
| 169 | |
| 170 | static inline void |
Akinobu Mita | 92ed932 | 2015-06-30 14:58:30 -0700 | [diff] [blame] | 171 | dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, |
| 172 | int nelems, enum dma_data_direction dir) |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 173 | { |
| 174 | int i; |
Akinobu Mita | 92ed932 | 2015-06-30 14:58:30 -0700 | [diff] [blame] | 175 | struct scatterlist *sg; |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 176 | |
Akinobu Mita | 92ed932 | 2015-06-30 14:58:30 -0700 | [diff] [blame] | 177 | for_each_sg(sglist, sg, nelems, i) |
Vineet Gupta | 1162b07 | 2013-01-18 15:12:20 +0530 | [diff] [blame] | 178 | _dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir); |
| 179 | } |
| 180 | |
| 181 | static inline int dma_supported(struct device *dev, u64 dma_mask) |
| 182 | { |
| 183 | /* Support 32 bit DMA mask exclusively */ |
| 184 | return dma_mask == DMA_BIT_MASK(32); |
| 185 | } |
| 186 | |
| 187 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
| 188 | { |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | static inline int dma_set_mask(struct device *dev, u64 dma_mask) |
| 193 | { |
| 194 | if (!dev->dma_mask || !dma_supported(dev, dma_mask)) |
| 195 | return -EIO; |
| 196 | |
| 197 | *dev->dma_mask = dma_mask; |
| 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | #endif |