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1#ifndef _PARISC_DMA_MAPPING_H
2#define _PARISC_DMA_MAPPING_H
3
4#include <linux/mm.h>
5#include <asm/cacheflush.h>
6#include <asm/scatterlist.h>
7
8/* See Documentation/DMA-API-HOWTO.txt */
9struct hppa_dma_ops {
10 int (*dma_supported)(struct device *dev, u64 mask);
11 void *(*alloc_consistent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);
12 void *(*alloc_noncoherent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);
13 void (*free_consistent)(struct device *dev, size_t size, void *vaddr, dma_addr_t iova);
14 dma_addr_t (*map_single)(struct device *dev, void *addr, size_t size, enum dma_data_direction direction);
15 void (*unmap_single)(struct device *dev, dma_addr_t iova, size_t size, enum dma_data_direction direction);
16 int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction);
17 void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nhwents, enum dma_data_direction direction);
18 void (*dma_sync_single_for_cpu)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
19 void (*dma_sync_single_for_device)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
20 void (*dma_sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
21 void (*dma_sync_sg_for_device)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
22};
23
24/*
25** We could live without the hppa_dma_ops indirection if we didn't want
26** to support 4 different coherent dma models with one binary (they will
27** someday be loadable modules):
28** I/O MMU consistent method dma_sync behavior
29** ============= ====================== =======================
30** a) PA-7x00LC uncachable host memory flush/purge
31** b) U2/Uturn cachable host memory NOP
32** c) Ike/Astro cachable host memory NOP
33** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
34**
35** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
36**
37** Systems (eg PCX-T workstations) that don't fall into the above
38** categories will need to modify the needed drivers to perform
39** flush/purge and allocate "regular" cacheable pages for everything.
40*/
41
42#ifdef CONFIG_PA11
43extern struct hppa_dma_ops pcxl_dma_ops;
44extern struct hppa_dma_ops pcx_dma_ops;
45#endif
46
47extern struct hppa_dma_ops *hppa_dma_ops;
48
49static inline void *
50dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
51 gfp_t flag)
52{
53 return hppa_dma_ops->alloc_consistent(dev, size, dma_handle, flag);
54}
55
56static inline void *
57dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
58 gfp_t flag)
59{
60 return hppa_dma_ops->alloc_noncoherent(dev, size, dma_handle, flag);
61}
62
63static inline void
64dma_free_coherent(struct device *dev, size_t size,
65 void *vaddr, dma_addr_t dma_handle)
66{
67 hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
68}
69
70static inline void
71dma_free_noncoherent(struct device *dev, size_t size,
72 void *vaddr, dma_addr_t dma_handle)
73{
74 hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
75}
76
77static inline dma_addr_t
78dma_map_single(struct device *dev, void *ptr, size_t size,
79 enum dma_data_direction direction)
80{
81 return hppa_dma_ops->map_single(dev, ptr, size, direction);
82}
83
84static inline void
85dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
86 enum dma_data_direction direction)
87{
88 hppa_dma_ops->unmap_single(dev, dma_addr, size, direction);
89}
90
91static inline int
92dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
93 enum dma_data_direction direction)
94{
95 return hppa_dma_ops->map_sg(dev, sg, nents, direction);
96}
97
98static inline void
99dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
100 enum dma_data_direction direction)
101{
102 hppa_dma_ops->unmap_sg(dev, sg, nhwentries, direction);
103}
104
105static inline dma_addr_t
106dma_map_page(struct device *dev, struct page *page, unsigned long offset,
107 size_t size, enum dma_data_direction direction)
108{
109 return dma_map_single(dev, (page_address(page) + (offset)), size, direction);
110}
111
112static inline void
113dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
114 enum dma_data_direction direction)
115{
116 dma_unmap_single(dev, dma_address, size, direction);
117}
118
119
120static inline void
121dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
122 enum dma_data_direction direction)
123{
124 if(hppa_dma_ops->dma_sync_single_for_cpu)
125 hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, 0, size, direction);
126}
127
128static inline void
129dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
130 enum dma_data_direction direction)
131{
132 if(hppa_dma_ops->dma_sync_single_for_device)
133 hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, 0, size, direction);
134}
135
136static inline void
137dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
138 unsigned long offset, size_t size,
139 enum dma_data_direction direction)
140{
141 if(hppa_dma_ops->dma_sync_single_for_cpu)
142 hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, offset, size, direction);
143}
144
145static inline void
146dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
147 unsigned long offset, size_t size,
148 enum dma_data_direction direction)
149{
150 if(hppa_dma_ops->dma_sync_single_for_device)
151 hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, offset, size, direction);
152}
153
154static inline void
155dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
156 enum dma_data_direction direction)
157{
158 if(hppa_dma_ops->dma_sync_sg_for_cpu)
159 hppa_dma_ops->dma_sync_sg_for_cpu(dev, sg, nelems, direction);
160}
161
162static inline void
163dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
164 enum dma_data_direction direction)
165{
166 if(hppa_dma_ops->dma_sync_sg_for_device)
167 hppa_dma_ops->dma_sync_sg_for_device(dev, sg, nelems, direction);
168}
169
170static inline int
171dma_supported(struct device *dev, u64 mask)
172{
173 return hppa_dma_ops->dma_supported(dev, mask);
174}
175
176static inline int
177dma_set_mask(struct device *dev, u64 mask)
178{
179 if(!dev->dma_mask || !dma_supported(dev, mask))
180 return -EIO;
181
182 *dev->dma_mask = mask;
183
184 return 0;
185}
186
187static inline void
188dma_cache_sync(struct device *dev, void *vaddr, size_t size,
189 enum dma_data_direction direction)
190{
191 if(hppa_dma_ops->dma_sync_single_for_cpu)
192 flush_kernel_dcache_range((unsigned long)vaddr, size);
193}
194
195static inline void *
196parisc_walk_tree(struct device *dev)
197{
198 struct device *otherdev;
199 if(likely(dev->platform_data != NULL))
200 return dev->platform_data;
201 /* OK, just traverse the bus to find it */
202 for(otherdev = dev->parent; otherdev;
203 otherdev = otherdev->parent) {
204 if(otherdev->platform_data) {
205 dev->platform_data = otherdev->platform_data;
206 break;
207 }
208 }
209 BUG_ON(!dev->platform_data);
210 return dev->platform_data;
211}
212
213#define GET_IOC(dev) (HBA_DATA(parisc_walk_tree(dev))->iommu)
214
215
216#ifdef CONFIG_IOMMU_CCIO
217struct parisc_device;
218struct ioc;
219void * ccio_get_iommu(const struct parisc_device *dev);
220int ccio_request_resource(const struct parisc_device *dev,
221 struct resource *res);
222int ccio_allocate_resource(const struct parisc_device *dev,
223 struct resource *res, unsigned long size,
224 unsigned long min, unsigned long max, unsigned long align);
225#else /* !CONFIG_IOMMU_CCIO */
226#define ccio_get_iommu(dev) NULL
227#define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res)
228#define ccio_allocate_resource(dev, res, size, min, max, align) \
229 allocate_resource(&iomem_resource, res, size, min, max, \
230 align, NULL, NULL)
231#endif /* !CONFIG_IOMMU_CCIO */
232
233#ifdef CONFIG_IOMMU_SBA
234struct parisc_device;
235void * sba_get_iommu(struct parisc_device *dev);
236#endif
237
238/* At the moment, we panic on error for IOMMU resource exaustion */
239#define dma_mapping_error(dev, x) 0
240
241#endif