1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _PARISC_DMA_MAPPING_H 3 #define _PARISC_DMA_MAPPING_H 4 5 #include <asm/cacheflush.h> 6 7 /* 8 ** We need to support 4 different coherent dma models with one binary: 9 ** 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 16 ** 17 ** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU. 18 ** 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. 22 */ 23 24 #ifdef CONFIG_PA11 25 extern const struct dma_map_ops pcxl_dma_ops; 26 extern const struct dma_map_ops pcx_dma_ops; 27 #endif 28 29 extern const struct dma_map_ops *hppa_dma_ops; 30 31 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) 32 { 33 return hppa_dma_ops; 34 } 35 36 static inline void * 37 parisc_walk_tree(struct device *dev) 38 { 39 struct device *otherdev; 40 if(likely(dev->platform_data != NULL)) 41 return dev->platform_data; 42 /* OK, just traverse the bus to find it */ 43 for(otherdev = dev->parent; otherdev; 44 otherdev = otherdev->parent) { 45 if(otherdev->platform_data) { 46 dev->platform_data = otherdev->platform_data; 47 break; 48 } 49 } 50 return dev->platform_data; 51 } 52 53 #define GET_IOC(dev) ({ \ 54 void *__pdata = parisc_walk_tree(dev); \ 55 __pdata ? HBA_DATA(__pdata)->iommu : NULL; \ 56 }) 57 58 #ifdef CONFIG_IOMMU_CCIO 59 struct parisc_device; 60 struct ioc; 61 void * ccio_get_iommu(const struct parisc_device *dev); 62 int ccio_request_resource(const struct parisc_device *dev, 63 struct resource *res); 64 int ccio_allocate_resource(const struct parisc_device *dev, 65 struct resource *res, unsigned long size, 66 unsigned long min, unsigned long max, unsigned long align); 67 #else /* !CONFIG_IOMMU_CCIO */ 68 #define ccio_get_iommu(dev) NULL 69 #define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res) 70 #define ccio_allocate_resource(dev, res, size, min, max, align) \ 71 allocate_resource(&iomem_resource, res, size, min, max, \ 72 align, NULL, NULL) 73 #endif /* !CONFIG_IOMMU_CCIO */ 74 75 #ifdef CONFIG_IOMMU_SBA 76 struct parisc_device; 77 void * sba_get_iommu(struct parisc_device *dev); 78 #endif 79 80 #endif 81