1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2004 IBM
5 * Implements the generic device dma API for powerpc.
6 * the pci and vio busses
8 #ifndef _ASM_DMA_MAPPING_H
9 #define _ASM_DMA_MAPPING_H
12 #include <linux/types.h>
13 #include <linux/cache.h>
14 /* need struct page definitions */
16 #include <linux/scatterlist.h>
17 #include <linux/dma-debug.h>
19 #include <asm/swiotlb.h>
21 /* Some dma direct funcs must be visible for use in other dma_ops */
22 extern void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
23 dma_addr_t *dma_handle, gfp_t flag,
25 extern void __dma_nommu_free_coherent(struct device *dev, size_t size,
26 void *vaddr, dma_addr_t dma_handle,
29 static inline unsigned long device_to_mask(struct device *dev)
31 if (dev->dma_mask && *dev->dma_mask)
32 return *dev->dma_mask;
33 /* Assume devices without mask can take 32 bit addresses */
38 * Available generic sets of operations
41 extern const struct dma_map_ops dma_iommu_ops;
43 extern const struct dma_map_ops dma_nommu_ops;
45 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
47 /* We don't handle the NULL dev case for ISA for now. We could
48 * do it via an out of line call but it is not needed for now. The
49 * only ISA DMA device we support is the floppy and we have a hack
50 * in the floppy driver directly to get a device for us.
58 * Get the dma offset on configurations where the dma address can be determined
59 * from the physical address by looking at a simple offset. Direct dma and
60 * swiotlb use this function, but it is typically not used by implementations
63 static inline dma_addr_t get_dma_offset(struct device *dev)
66 return dev->archdata.dma_offset;
68 return PCI_DRAM_OFFSET;
71 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
74 dev->archdata.dma_offset = off;
77 #endif /* __KERNEL__ */
78 #endif /* _ASM_DMA_MAPPING_H */