1 #ifndef _PARISC_DMA_MAPPING_H
2 #define _PARISC_DMA_MAPPING_H
4 #include <linux/config.h>
6 #include <asm/cacheflush.h>
7 #include <asm/scatterlist.h>
9 /* See Documentation/DMA-mapping.txt */
11 int (*dma_supported)(struct device *dev, u64 mask);
12 void *(*alloc_consistent)(struct device *dev, size_t size, dma_addr_t *iova, int flag);
13 void *(*alloc_noncoherent)(struct device *dev, size_t size, dma_addr_t *iova, int flag);
14 void (*free_consistent)(struct device *dev, size_t size, void *vaddr, dma_addr_t iova);
15 dma_addr_t (*map_single)(struct device *dev, void *addr, size_t size, enum dma_data_direction direction);
16 void (*unmap_single)(struct device *dev, dma_addr_t iova, size_t size, enum dma_data_direction direction);
17 int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction);
18 void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nhwents, enum dma_data_direction direction);
19 void (*dma_sync_single_for_cpu)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
20 void (*dma_sync_single_for_device)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
21 void (*dma_sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
22 void (*dma_sync_sg_for_device)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
26 ** We could live without the hppa_dma_ops indirection if we didn't want
27 ** to support 4 different coherent dma models with one binary (they will
28 ** someday be loadable modules):
29 ** I/O MMU consistent method dma_sync behavior
30 ** ============= ====================== =======================
31 ** a) PA-7x00LC uncachable host memory flush/purge
32 ** b) U2/Uturn cachable host memory NOP
33 ** c) Ike/Astro cachable host memory NOP
34 ** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
36 ** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
38 ** Systems (eg PCX-T workstations) that don't fall into the above
39 ** categories will need to modify the needed drivers to perform
40 ** flush/purge and allocate "regular" cacheable pages for everything.
44 extern struct hppa_dma_ops pcxl_dma_ops;
45 extern struct hppa_dma_ops pcx_dma_ops;
48 extern struct hppa_dma_ops *hppa_dma_ops;
51 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
54 return hppa_dma_ops->alloc_consistent(dev, size, dma_handle, flag);
58 dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
61 return hppa_dma_ops->alloc_noncoherent(dev, size, dma_handle, flag);
65 dma_free_coherent(struct device *dev, size_t size,
66 void *vaddr, dma_addr_t dma_handle)
68 hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
72 dma_free_noncoherent(struct device *dev, size_t size,
73 void *vaddr, dma_addr_t dma_handle)
75 hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
78 static inline dma_addr_t
79 dma_map_single(struct device *dev, void *ptr, size_t size,
80 enum dma_data_direction direction)
82 return hppa_dma_ops->map_single(dev, ptr, size, direction);
86 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
87 enum dma_data_direction direction)
89 hppa_dma_ops->unmap_single(dev, dma_addr, size, direction);
93 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
94 enum dma_data_direction direction)
96 return hppa_dma_ops->map_sg(dev, sg, nents, direction);
100 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
101 enum dma_data_direction direction)
103 hppa_dma_ops->unmap_sg(dev, sg, nhwentries, direction);
106 static inline dma_addr_t
107 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
108 size_t size, enum dma_data_direction direction)
110 return dma_map_single(dev, (page_address(page) + (offset)), size, direction);
114 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
115 enum dma_data_direction direction)
117 dma_unmap_single(dev, dma_address, size, direction);
122 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
123 enum dma_data_direction direction)
125 if(hppa_dma_ops->dma_sync_single_for_cpu)
126 hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, 0, size, direction);
130 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
131 enum dma_data_direction direction)
133 if(hppa_dma_ops->dma_sync_single_for_device)
134 hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, 0, size, direction);
138 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
139 unsigned long offset, size_t size,
140 enum dma_data_direction direction)
142 if(hppa_dma_ops->dma_sync_single_for_cpu)
143 hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, offset, size, direction);
147 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
148 unsigned long offset, size_t size,
149 enum dma_data_direction direction)
151 if(hppa_dma_ops->dma_sync_single_for_device)
152 hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, offset, size, direction);
156 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
157 enum dma_data_direction direction)
159 if(hppa_dma_ops->dma_sync_sg_for_cpu)
160 hppa_dma_ops->dma_sync_sg_for_cpu(dev, sg, nelems, direction);
164 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
165 enum dma_data_direction direction)
167 if(hppa_dma_ops->dma_sync_sg_for_device)
168 hppa_dma_ops->dma_sync_sg_for_device(dev, sg, nelems, direction);
172 dma_supported(struct device *dev, u64 mask)
174 return hppa_dma_ops->dma_supported(dev, mask);
178 dma_set_mask(struct device *dev, u64 mask)
180 if(!dev->dma_mask || !dma_supported(dev, mask))
183 *dev->dma_mask = mask;
189 dma_get_cache_alignment(void)
191 return dcache_stride;
195 dma_is_consistent(dma_addr_t dma_addr)
197 return (hppa_dma_ops->dma_sync_single_for_cpu == NULL);
201 dma_cache_sync(void *vaddr, size_t size,
202 enum dma_data_direction direction)
204 if(hppa_dma_ops->dma_sync_single_for_cpu)
205 flush_kernel_dcache_range((unsigned long)vaddr, size);
209 parisc_walk_tree(struct device *dev)
211 struct device *otherdev;
212 if(likely(dev->platform_data != NULL))
213 return dev->platform_data;
214 /* OK, just traverse the bus to find it */
215 for(otherdev = dev->parent; otherdev;
216 otherdev = otherdev->parent) {
217 if(otherdev->platform_data) {
218 dev->platform_data = otherdev->platform_data;
222 BUG_ON(!dev->platform_data);
223 return dev->platform_data;
226 #define GET_IOC(dev) (HBA_DATA(parisc_walk_tree(dev))->iommu);
229 #ifdef CONFIG_IOMMU_CCIO
230 struct parisc_device;
232 void * ccio_get_iommu(const struct parisc_device *dev);
233 int ccio_request_resource(const struct parisc_device *dev,
234 struct resource *res);
235 int ccio_allocate_resource(const struct parisc_device *dev,
236 struct resource *res, unsigned long size,
237 unsigned long min, unsigned long max, unsigned long align);
238 #else /* !CONFIG_IOMMU_CCIO */
239 #define ccio_get_iommu(dev) NULL
240 #define ccio_request_resource(dev, res) request_resource(&iomem_resource, res)
241 #define ccio_allocate_resource(dev, res, size, min, max, align) \
242 allocate_resource(&iomem_resource, res, size, min, max, \
244 #endif /* !CONFIG_IOMMU_CCIO */
246 #ifdef CONFIG_IOMMU_SBA
247 struct parisc_device;
248 void * sba_get_iommu(struct parisc_device *dev);
251 /* At the moment, we panic on error for IOMMU resource exaustion */
252 #define dma_mapping_error(x) 0