1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PARISC_DMA_MAPPING_H
3 #define _PARISC_DMA_MAPPING_H
5 #include <asm/cacheflush.h>
8 ** We need to support 4 different coherent dma models with one binary:
10 ** I/O MMU consistent method dma_sync behavior
11 ** ============= ====================== =======================
12 ** a) PA-7x00LC uncachable host memory flush/purge
13 ** b) U2/Uturn cachable host memory NOP
14 ** c) Ike/Astro cachable host memory NOP
15 ** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
17 ** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
19 ** Systems (eg PCX-T workstations) that don't fall into the above
20 ** categories will need to modify the needed drivers to perform
21 ** flush/purge and allocate "regular" cacheable pages for everything.
25 extern const struct dma_map_ops pcxl_dma_ops;
26 extern const struct dma_map_ops pcx_dma_ops;
29 extern const struct dma_map_ops *hppa_dma_ops;
31 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
37 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
38 enum dma_data_direction direction)
40 if (hppa_dma_ops->sync_single_for_cpu)
41 flush_kernel_dcache_range((unsigned long)vaddr, size);
45 parisc_walk_tree(struct device *dev)
47 struct device *otherdev;
48 if(likely(dev->platform_data != NULL))
49 return dev->platform_data;
50 /* OK, just traverse the bus to find it */
51 for(otherdev = dev->parent; otherdev;
52 otherdev = otherdev->parent) {
53 if(otherdev->platform_data) {
54 dev->platform_data = otherdev->platform_data;
58 return dev->platform_data;
61 #define GET_IOC(dev) ({ \
62 void *__pdata = parisc_walk_tree(dev); \
63 __pdata ? HBA_DATA(__pdata)->iommu : NULL; \
66 #ifdef CONFIG_IOMMU_CCIO
69 void * ccio_get_iommu(const struct parisc_device *dev);
70 int ccio_request_resource(const struct parisc_device *dev,
71 struct resource *res);
72 int ccio_allocate_resource(const struct parisc_device *dev,
73 struct resource *res, unsigned long size,
74 unsigned long min, unsigned long max, unsigned long align);
75 #else /* !CONFIG_IOMMU_CCIO */
76 #define ccio_get_iommu(dev) NULL
77 #define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res)
78 #define ccio_allocate_resource(dev, res, size, min, max, align) \
79 allocate_resource(&iomem_resource, res, size, min, max, \
81 #endif /* !CONFIG_IOMMU_CCIO */
83 #ifdef CONFIG_IOMMU_SBA
85 void * sba_get_iommu(struct parisc_device *dev);