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Linux/arch/microblaze/kernel/dma.c

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  1 /*
  2  * Copyright (C) 2009-2010 PetaLogix
  3  * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
  4  *
  5  * Provide default implementations of the DMA mapping callbacks for
  6  * directly mapped busses.
  7  */
  8 
  9 #include <linux/device.h>
 10 #include <linux/dma-mapping.h>
 11 #include <linux/gfp.h>
 12 #include <linux/dma-debug.h>
 13 #include <linux/export.h>
 14 #include <linux/bug.h>
 15 
 16 #define NOT_COHERENT_CACHE
 17 
 18 static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 19                                        dma_addr_t *dma_handle, gfp_t flag,
 20                                        struct dma_attrs *attrs)
 21 {
 22 #ifdef NOT_COHERENT_CACHE
 23         return consistent_alloc(flag, size, dma_handle);
 24 #else
 25         void *ret;
 26         struct page *page;
 27         int node = dev_to_node(dev);
 28 
 29         /* ignore region specifiers */
 30         flag  &= ~(__GFP_HIGHMEM);
 31 
 32         page = alloc_pages_node(node, flag, get_order(size));
 33         if (page == NULL)
 34                 return NULL;
 35         ret = page_address(page);
 36         memset(ret, 0, size);
 37         *dma_handle = virt_to_phys(ret);
 38 
 39         return ret;
 40 #endif
 41 }
 42 
 43 static void dma_direct_free_coherent(struct device *dev, size_t size,
 44                                      void *vaddr, dma_addr_t dma_handle,
 45                                      struct dma_attrs *attrs)
 46 {
 47 #ifdef NOT_COHERENT_CACHE
 48         consistent_free(size, vaddr);
 49 #else
 50         free_pages((unsigned long)vaddr, get_order(size));
 51 #endif
 52 }
 53 
 54 static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 55                              int nents, enum dma_data_direction direction,
 56                              struct dma_attrs *attrs)
 57 {
 58         struct scatterlist *sg;
 59         int i;
 60 
 61         /* FIXME this part of code is untested */
 62         for_each_sg(sgl, sg, nents, i) {
 63                 sg->dma_address = sg_phys(sg);
 64                 __dma_sync(page_to_phys(sg_page(sg)) + sg->offset,
 65                                                         sg->length, direction);
 66         }
 67 
 68         return nents;
 69 }
 70 
 71 static int dma_direct_dma_supported(struct device *dev, u64 mask)
 72 {
 73         return 1;
 74 }
 75 
 76 static inline dma_addr_t dma_direct_map_page(struct device *dev,
 77                                              struct page *page,
 78                                              unsigned long offset,
 79                                              size_t size,
 80                                              enum dma_data_direction direction,
 81                                              struct dma_attrs *attrs)
 82 {
 83         __dma_sync(page_to_phys(page) + offset, size, direction);
 84         return page_to_phys(page) + offset;
 85 }
 86 
 87 static inline void dma_direct_unmap_page(struct device *dev,
 88                                          dma_addr_t dma_address,
 89                                          size_t size,
 90                                          enum dma_data_direction direction,
 91                                          struct dma_attrs *attrs)
 92 {
 93 /* There is not necessary to do cache cleanup
 94  *
 95  * phys_to_virt is here because in __dma_sync_page is __virt_to_phys and
 96  * dma_address is physical address
 97  */
 98         __dma_sync(dma_address, size, direction);
 99 }
100 
101 static inline void
102 dma_direct_sync_single_for_cpu(struct device *dev,
103                                dma_addr_t dma_handle, size_t size,
104                                enum dma_data_direction direction)
105 {
106         /*
107          * It's pointless to flush the cache as the memory segment
108          * is given to the CPU
109          */
110 
111         if (direction == DMA_FROM_DEVICE)
112                 __dma_sync(dma_handle, size, direction);
113 }
114 
115 static inline void
116 dma_direct_sync_single_for_device(struct device *dev,
117                                   dma_addr_t dma_handle, size_t size,
118                                   enum dma_data_direction direction)
119 {
120         /*
121          * It's pointless to invalidate the cache if the device isn't
122          * supposed to write to the relevant region
123          */
124 
125         if (direction == DMA_TO_DEVICE)
126                 __dma_sync(dma_handle, size, direction);
127 }
128 
129 static inline void
130 dma_direct_sync_sg_for_cpu(struct device *dev,
131                            struct scatterlist *sgl, int nents,
132                            enum dma_data_direction direction)
133 {
134         struct scatterlist *sg;
135         int i;
136 
137         /* FIXME this part of code is untested */
138         if (direction == DMA_FROM_DEVICE)
139                 for_each_sg(sgl, sg, nents, i)
140                         __dma_sync(sg->dma_address, sg->length, direction);
141 }
142 
143 static inline void
144 dma_direct_sync_sg_for_device(struct device *dev,
145                               struct scatterlist *sgl, int nents,
146                               enum dma_data_direction direction)
147 {
148         struct scatterlist *sg;
149         int i;
150 
151         /* FIXME this part of code is untested */
152         if (direction == DMA_TO_DEVICE)
153                 for_each_sg(sgl, sg, nents, i)
154                         __dma_sync(sg->dma_address, sg->length, direction);
155 }
156 
157 static
158 int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
159                              void *cpu_addr, dma_addr_t handle, size_t size,
160                              struct dma_attrs *attrs)
161 {
162 #ifdef CONFIG_MMU
163         unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
164         unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
165         unsigned long off = vma->vm_pgoff;
166         unsigned long pfn;
167 
168         if (off >= count || user_count > (count - off))
169                 return -ENXIO;
170 
171 #ifdef NOT_COHERENT_CACHE
172         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
173         pfn = consistent_virt_to_pfn(cpu_addr);
174 #else
175         pfn = virt_to_pfn(cpu_addr);
176 #endif
177         return remap_pfn_range(vma, vma->vm_start, pfn + off,
178                                vma->vm_end - vma->vm_start, vma->vm_page_prot);
179 #else
180         return -ENXIO;
181 #endif
182 }
183 
184 struct dma_map_ops dma_direct_ops = {
185         .alloc          = dma_direct_alloc_coherent,
186         .free           = dma_direct_free_coherent,
187         .mmap           = dma_direct_mmap_coherent,
188         .map_sg         = dma_direct_map_sg,
189         .dma_supported  = dma_direct_dma_supported,
190         .map_page       = dma_direct_map_page,
191         .unmap_page     = dma_direct_unmap_page,
192         .sync_single_for_cpu            = dma_direct_sync_single_for_cpu,
193         .sync_single_for_device         = dma_direct_sync_single_for_device,
194         .sync_sg_for_cpu                = dma_direct_sync_sg_for_cpu,
195         .sync_sg_for_device             = dma_direct_sync_sg_for_device,
196 };
197 EXPORT_SYMBOL(dma_direct_ops);
198 
199 /* Number of entries preallocated for DMA-API debugging */
200 #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
201 
202 static int __init dma_init(void)
203 {
204         dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
205 
206         return 0;
207 }
208 fs_initcall(dma_init);
209 

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