Aurelien Jacquiot | 14aa7e8 | 2011-10-04 12:17:19 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Texas Instruments Incorporated |
| 3 | * Author: Mark Salter <msalter@redhat.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/dma-mapping.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/mm_types.h> |
| 13 | #include <linux/scatterlist.h> |
| 14 | |
| 15 | #include <asm/cacheflush.h> |
| 16 | |
| 17 | static void c6x_dma_sync(dma_addr_t handle, size_t size, |
| 18 | enum dma_data_direction dir) |
| 19 | { |
| 20 | unsigned long paddr = handle; |
| 21 | |
| 22 | BUG_ON(!valid_dma_direction(dir)); |
| 23 | |
| 24 | switch (dir) { |
| 25 | case DMA_FROM_DEVICE: |
| 26 | L2_cache_block_invalidate(paddr, paddr + size); |
| 27 | break; |
| 28 | case DMA_TO_DEVICE: |
| 29 | L2_cache_block_writeback(paddr, paddr + size); |
| 30 | break; |
| 31 | case DMA_BIDIRECTIONAL: |
| 32 | L2_cache_block_writeback_invalidate(paddr, paddr + size); |
| 33 | break; |
| 34 | default: |
| 35 | break; |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, |
| 40 | enum dma_data_direction dir) |
| 41 | { |
| 42 | dma_addr_t addr = virt_to_phys(ptr); |
| 43 | |
| 44 | c6x_dma_sync(addr, size, dir); |
| 45 | |
| 46 | debug_dma_map_page(dev, virt_to_page(ptr), |
| 47 | (unsigned long)ptr & ~PAGE_MASK, size, |
| 48 | dir, addr, true); |
| 49 | return addr; |
| 50 | } |
| 51 | EXPORT_SYMBOL(dma_map_single); |
| 52 | |
| 53 | |
| 54 | void dma_unmap_single(struct device *dev, dma_addr_t handle, |
| 55 | size_t size, enum dma_data_direction dir) |
| 56 | { |
| 57 | c6x_dma_sync(handle, size, dir); |
| 58 | |
| 59 | debug_dma_unmap_page(dev, handle, size, dir, true); |
| 60 | } |
| 61 | EXPORT_SYMBOL(dma_unmap_single); |
| 62 | |
| 63 | |
| 64 | int dma_map_sg(struct device *dev, struct scatterlist *sglist, |
| 65 | int nents, enum dma_data_direction dir) |
| 66 | { |
| 67 | struct scatterlist *sg; |
| 68 | int i; |
| 69 | |
| 70 | for_each_sg(sglist, sg, nents, i) |
| 71 | sg->dma_address = dma_map_single(dev, sg_virt(sg), sg->length, |
| 72 | dir); |
| 73 | |
| 74 | debug_dma_map_sg(dev, sglist, nents, nents, dir); |
| 75 | |
| 76 | return nents; |
| 77 | } |
| 78 | EXPORT_SYMBOL(dma_map_sg); |
| 79 | |
| 80 | |
| 81 | void dma_unmap_sg(struct device *dev, struct scatterlist *sglist, |
| 82 | int nents, enum dma_data_direction dir) |
| 83 | { |
| 84 | struct scatterlist *sg; |
| 85 | int i; |
| 86 | |
| 87 | for_each_sg(sglist, sg, nents, i) |
| 88 | dma_unmap_single(dev, sg_dma_address(sg), sg->length, dir); |
| 89 | |
| 90 | debug_dma_unmap_sg(dev, sglist, nents, dir); |
| 91 | } |
| 92 | EXPORT_SYMBOL(dma_unmap_sg); |
| 93 | |
| 94 | void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, |
| 95 | size_t size, enum dma_data_direction dir) |
| 96 | { |
| 97 | c6x_dma_sync(handle, size, dir); |
| 98 | |
| 99 | debug_dma_sync_single_for_cpu(dev, handle, size, dir); |
| 100 | } |
| 101 | EXPORT_SYMBOL(dma_sync_single_for_cpu); |
| 102 | |
| 103 | |
| 104 | void dma_sync_single_for_device(struct device *dev, dma_addr_t handle, |
| 105 | size_t size, enum dma_data_direction dir) |
| 106 | { |
| 107 | c6x_dma_sync(handle, size, dir); |
| 108 | |
| 109 | debug_dma_sync_single_for_device(dev, handle, size, dir); |
| 110 | } |
| 111 | EXPORT_SYMBOL(dma_sync_single_for_device); |
| 112 | |
| 113 | |
| 114 | void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, |
| 115 | int nents, enum dma_data_direction dir) |
| 116 | { |
| 117 | struct scatterlist *sg; |
| 118 | int i; |
| 119 | |
| 120 | for_each_sg(sglist, sg, nents, i) |
| 121 | dma_sync_single_for_cpu(dev, sg_dma_address(sg), |
| 122 | sg->length, dir); |
| 123 | |
| 124 | debug_dma_sync_sg_for_cpu(dev, sglist, nents, dir); |
| 125 | } |
| 126 | EXPORT_SYMBOL(dma_sync_sg_for_cpu); |
| 127 | |
| 128 | |
| 129 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, |
| 130 | int nents, enum dma_data_direction dir) |
| 131 | { |
| 132 | struct scatterlist *sg; |
| 133 | int i; |
| 134 | |
| 135 | for_each_sg(sglist, sg, nents, i) |
| 136 | dma_sync_single_for_device(dev, sg_dma_address(sg), |
| 137 | sg->length, dir); |
| 138 | |
| 139 | debug_dma_sync_sg_for_device(dev, sglist, nents, dir); |
| 140 | } |
| 141 | EXPORT_SYMBOL(dma_sync_sg_for_device); |
| 142 | |
| 143 | |
| 144 | /* Number of entries preallocated for DMA-API debugging */ |
| 145 | #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16) |
| 146 | |
| 147 | static int __init dma_init(void) |
| 148 | { |
| 149 | dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); |
| 150 | |
| 151 | return 0; |
| 152 | } |
| 153 | fs_initcall(dma_init); |