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 extern const struct dma_map_ops *hppa_dma_ops; 25 26 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) 27 { 28 return hppa_dma_ops; 29 } 30 31 static inline void * 32 parisc_walk_tree(struct device *dev) 33 { 34 struct device *otherdev; 35 if(likely(dev->platform_data != NULL)) 36 return dev->platform_data; 37 /* OK, just traverse the bus to find it */ 38 for(otherdev = dev->parent; otherdev; 39 otherdev = otherdev->parent) { 40 if(otherdev->platform_data) { 41 dev->platform_data = otherdev->platform_data; 42 break; 43 } 44 } 45 return dev->platform_data; 46 } 47 48 #define GET_IOC(dev) ({ \ 49 void *__pdata = parisc_walk_tree(dev); \ 50 __pdata ? HBA_DATA(__pdata)->iommu : NULL; \ 51 }) 52 53 #ifdef CONFIG_IOMMU_CCIO 54 struct parisc_device; 55 struct ioc; 56 void * ccio_get_iommu(const struct parisc_device *dev); 57 int ccio_request_resource(const struct parisc_device *dev, 58 struct resource *res); 59 int ccio_allocate_resource(const struct parisc_device *dev, 60 struct resource *res, unsigned long size, 61 unsigned long min, unsigned long max, unsigned long align); 62 #else /* !CONFIG_IOMMU_CCIO */ 63 #define ccio_get_iommu(dev) NULL 64 #define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res) 65 #define ccio_allocate_resource(dev, res, size, min, max, align) \ 66 allocate_resource(&iomem_resource, res, size, min, max, \ 67 align, NULL, NULL) 68 #endif /* !CONFIG_IOMMU_CCIO */ 69 70 #ifdef CONFIG_IOMMU_SBA 71 struct parisc_device; 72 void * sba_get_iommu(struct parisc_device *dev); 73 #endif 74 75 #endif 76