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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 | 2 | /* |
78b09735 SR |
3 | * Copyright (C) 2004 IBM |
4 | * | |
5 | * Implements the generic device dma API for powerpc. | |
6 | * the pci and vio busses | |
1da177e4 | 7 | */ |
78b09735 SR |
8 | #ifndef _ASM_DMA_MAPPING_H |
9 | #define _ASM_DMA_MAPPING_H | |
33ff910f AB |
10 | #ifdef __KERNEL__ |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/cache.h> | |
14 | /* need struct page definitions */ | |
15 | #include <linux/mm.h> | |
16 | #include <linux/scatterlist.h> | |
46bab4e4 | 17 | #include <linux/dma-debug.h> |
33ff910f | 18 | #include <asm/io.h> |
ec3cf2ec | 19 | #include <asm/swiotlb.h> |
33ff910f | 20 | |
ec3cf2ec | 21 | /* Some dma direct funcs must be visible for use in other dma_ops */ |
817820b0 BH |
22 | extern void *__dma_direct_alloc_coherent(struct device *dev, size_t size, |
23 | dma_addr_t *dma_handle, gfp_t flag, | |
00085f1e | 24 | unsigned long attrs); |
817820b0 BH |
25 | extern void __dma_direct_free_coherent(struct device *dev, size_t size, |
26 | void *vaddr, dma_addr_t dma_handle, | |
00085f1e | 27 | unsigned long attrs); |
64ccc9c0 MS |
28 | extern int dma_direct_mmap_coherent(struct device *dev, |
29 | struct vm_area_struct *vma, | |
30 | void *cpu_addr, dma_addr_t handle, | |
00085f1e | 31 | size_t size, unsigned long attrs); |
ec3cf2ec | 32 | |
33ff910f AB |
33 | #ifdef CONFIG_NOT_COHERENT_CACHE |
34 | /* | |
35 | * DMA-consistent mapping functions for PowerPCs that don't support | |
36 | * cache snooping. These allocate/free a region of uncached mapped | |
37 | * memory space for use with DMA devices. Alternatively, you could | |
38 | * allocate the space "normally" and use the cache management functions | |
39 | * to ensure it is consistent. | |
40 | */ | |
8b31e49d BH |
41 | struct device; |
42 | extern void *__dma_alloc_coherent(struct device *dev, size_t size, | |
43 | dma_addr_t *handle, gfp_t gfp); | |
33ff910f AB |
44 | extern void __dma_free_coherent(size_t size, void *vaddr); |
45 | extern void __dma_sync(void *vaddr, size_t size, int direction); | |
46 | extern void __dma_sync_page(struct page *page, unsigned long offset, | |
47 | size_t size, int direction); | |
6090912c | 48 | extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr); |
33ff910f AB |
49 | |
50 | #else /* ! CONFIG_NOT_COHERENT_CACHE */ | |
51 | /* | |
52 | * Cache coherent cores. | |
53 | */ | |
54 | ||
8b31e49d | 55 | #define __dma_alloc_coherent(dev, gfp, size, handle) NULL |
33ff910f AB |
56 | #define __dma_free_coherent(size, addr) ((void)0) |
57 | #define __dma_sync(addr, size, rw) ((void)0) | |
58 | #define __dma_sync_page(pg, off, sz, rw) ((void)0) | |
59 | ||
60 | #endif /* ! CONFIG_NOT_COHERENT_CACHE */ | |
61 | ||
3a4c6f0b MN |
62 | static inline unsigned long device_to_mask(struct device *dev) |
63 | { | |
64 | if (dev->dma_mask && *dev->dma_mask) | |
65 | return *dev->dma_mask; | |
66 | /* Assume devices without mask can take 32 bit addresses */ | |
67 | return 0xfffffffful; | |
68 | } | |
69 | ||
4fc665b8 BB |
70 | /* |
71 | * Available generic sets of operations | |
72 | */ | |
73 | #ifdef CONFIG_PPC64 | |
45223c54 | 74 | extern struct dma_map_ops dma_iommu_ops; |
4fc665b8 | 75 | #endif |
5299709d | 76 | extern const struct dma_map_ops dma_direct_ops; |
4fc665b8 | 77 | |
815dd187 | 78 | static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) |
33ff910f AB |
79 | { |
80 | /* We don't handle the NULL dev case for ISA for now. We could | |
81 | * do it via an out of line call but it is not needed for now. The | |
82 | * only ISA DMA device we support is the floppy and we have a hack | |
83 | * in the floppy driver directly to get a device for us. | |
84 | */ | |
815dd187 | 85 | return NULL; |
1f62a162 ME |
86 | } |
87 | ||
1cebd7a0 BB |
88 | /* |
89 | * get_dma_offset() | |
90 | * | |
91 | * Get the dma offset on configurations where the dma address can be determined | |
92 | * from the physical address by looking at a simple offset. Direct dma and | |
93 | * swiotlb use this function, but it is typically not used by implementations | |
94 | * with an iommu. | |
95 | */ | |
738ef42e | 96 | static inline dma_addr_t get_dma_offset(struct device *dev) |
1cebd7a0 BB |
97 | { |
98 | if (dev) | |
2db4928b | 99 | return dev->archdata.dma_offset; |
1cebd7a0 BB |
100 | |
101 | return PCI_DRAM_OFFSET; | |
102 | } | |
103 | ||
738ef42e BB |
104 | static inline void set_dma_offset(struct device *dev, dma_addr_t off) |
105 | { | |
106 | if (dev) | |
2db4928b | 107 | dev->archdata.dma_offset = off; |
738ef42e BB |
108 | } |
109 | ||
46bab4e4 FT |
110 | /* this will be removed soon */ |
111 | #define flush_write_buffers() | |
112 | ||
452e06af CH |
113 | #define HAVE_ARCH_DMA_SET_MASK 1 |
114 | extern int dma_set_mask(struct device *dev, u64 dma_mask); | |
115 | ||
fe7e85c6 | 116 | extern u64 __dma_get_required_mask(struct device *dev); |
33ff910f | 117 | |
9a937c91 FT |
118 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
119 | { | |
762afb73 FT |
120 | #ifdef CONFIG_SWIOTLB |
121 | struct dev_archdata *sd = &dev->archdata; | |
9a937c91 | 122 | |
762afb73 | 123 | if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr) |
acdb6685 | 124 | return false; |
762afb73 | 125 | #endif |
9a937c91 FT |
126 | |
127 | if (!dev->dma_mask) | |
acdb6685 | 128 | return false; |
9a937c91 | 129 | |
ac2b3e67 | 130 | return addr + size - 1 <= *dev->dma_mask; |
9a937c91 FT |
131 | } |
132 | ||
8d4f5339 FT |
133 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
134 | { | |
1cebd7a0 | 135 | return paddr + get_dma_offset(dev); |
8d4f5339 FT |
136 | } |
137 | ||
138 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) | |
139 | { | |
1cebd7a0 | 140 | return daddr - get_dma_offset(dev); |
8d4f5339 FT |
141 | } |
142 | ||
6090912c BH |
143 | #define ARCH_HAS_DMA_MMAP_COHERENT |
144 | ||
d3fa72e4 | 145 | static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
78b09735 | 146 | enum dma_data_direction direction) |
1da177e4 | 147 | { |
78b09735 | 148 | BUG_ON(direction == DMA_NONE); |
1da177e4 LT |
149 | __dma_sync(vaddr, size, (int)direction); |
150 | } | |
151 | ||
88ced031 | 152 | #endif /* __KERNEL__ */ |
78b09735 | 153 | #endif /* _ASM_DMA_MAPPING_H */ |