1 #ifndef _PARISC_DMA_MAPPING_H
2 #define _PARISC_DMA_MAPPING_H
4 #include <asm/cacheflush.h>
7 ** We need to support 4 different coherent dma models with one binary:
9 ** I/O MMU consistent method dma_sync behavior
10 ** ============= ====================== =======================
11 ** a) PA-7x00LC uncachable host memory flush/purge
12 ** b) U2/Uturn cachable host memory NOP
13 ** c) Ike/Astro cachable host memory NOP
14 ** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
16 ** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
18 ** Systems (eg PCX-T workstations) that don't fall into the above
19 ** categories will need to modify the needed drivers to perform
20 ** flush/purge and allocate "regular" cacheable pages for everything.
24 extern struct dma_map_ops pcxl_dma_ops;
25 extern struct dma_map_ops pcx_dma_ops;
28 extern struct dma_map_ops *hppa_dma_ops;
30 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
36 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
37 enum dma_data_direction direction)
39 if (hppa_dma_ops->sync_single_for_cpu)
40 flush_kernel_dcache_range((unsigned long)vaddr, size);
44 parisc_walk_tree(struct device *dev)
46 struct device *otherdev;
47 if(likely(dev->platform_data != NULL))
48 return dev->platform_data;
49 /* OK, just traverse the bus to find it */
50 for(otherdev = dev->parent; otherdev;
51 otherdev = otherdev->parent) {
52 if(otherdev->platform_data) {
53 dev->platform_data = otherdev->platform_data;
57 BUG_ON(!dev->platform_data);
58 return dev->platform_data;
61 #define GET_IOC(dev) (HBA_DATA(parisc_walk_tree(dev))->iommu)
64 #ifdef CONFIG_IOMMU_CCIO
67 void * ccio_get_iommu(const struct parisc_device *dev);
68 int ccio_request_resource(const struct parisc_device *dev,
69 struct resource *res);
70 int ccio_allocate_resource(const struct parisc_device *dev,
71 struct resource *res, unsigned long size,
72 unsigned long min, unsigned long max, unsigned long align);
73 #else /* !CONFIG_IOMMU_CCIO */
74 #define ccio_get_iommu(dev) NULL
75 #define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res)
76 #define ccio_allocate_resource(dev, res, size, min, max, align) \
77 allocate_resource(&iomem_resource, res, size, min, max, \
79 #endif /* !CONFIG_IOMMU_CCIO */
81 #ifdef CONFIG_IOMMU_SBA
83 void * sba_get_iommu(struct parisc_device *dev);