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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef ASMARM_DMA_MAPPING_H |
3 | #define ASMARM_DMA_MAPPING_H | |
4 | ||
5 | #ifdef __KERNEL__ | |
6 | ||
98ed7d4b | 7 | #include <linux/mm_types.h> |
dee9ba82 | 8 | #include <linux/scatterlist.h> |
24056f52 | 9 | #include <linux/dma-debug.h> |
1da177e4 | 10 | |
98ed7d4b RK |
11 | #include <asm/memory.h> |
12 | ||
c7e9bc54 SS |
13 | #include <xen/xen.h> |
14 | #include <asm/xen/hypervisor.h> | |
15 | ||
5299709d BVA |
16 | extern const struct dma_map_ops arm_dma_ops; |
17 | extern const struct dma_map_ops arm_coherent_dma_ops; | |
2dc6a016 | 18 | |
815dd187 | 19 | static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) |
c7e9bc54 | 20 | { |
1c51c429 | 21 | return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_noop_ops; |
c7e9bc54 SS |
22 | } |
23 | ||
9eedd963 RK |
24 | #ifdef __arch_page_to_dma |
25 | #error Please update to __arch_pfn_to_dma | |
26 | #endif | |
27 | ||
98ed7d4b | 28 | /* |
9eedd963 RK |
29 | * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private |
30 | * functions used internally by the DMA-mapping API to provide DMA | |
31 | * addresses. They must not be used by drivers. | |
98ed7d4b | 32 | */ |
9eedd963 RK |
33 | #ifndef __arch_pfn_to_dma |
34 | static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) | |
58edb515 | 35 | { |
6ce0d200 GS |
36 | if (dev) |
37 | pfn -= dev->dma_pfn_offset; | |
9eedd963 | 38 | return (dma_addr_t)__pfn_to_bus(pfn); |
58edb515 | 39 | } |
98ed7d4b | 40 | |
9eedd963 | 41 | static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) |
ef1baed8 | 42 | { |
6ce0d200 GS |
43 | unsigned long pfn = __bus_to_pfn(addr); |
44 | ||
45 | if (dev) | |
46 | pfn += dev->dma_pfn_offset; | |
47 | ||
48 | return pfn; | |
ef1baed8 RK |
49 | } |
50 | ||
98ed7d4b RK |
51 | static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) |
52 | { | |
6ce0d200 GS |
53 | if (dev) { |
54 | unsigned long pfn = dma_to_pfn(dev, addr); | |
55 | ||
56 | return phys_to_virt(__pfn_to_phys(pfn)); | |
57 | } | |
58 | ||
01f461a3 | 59 | return (void *)__bus_to_virt((unsigned long)addr); |
98ed7d4b RK |
60 | } |
61 | ||
62 | static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) | |
63 | { | |
6ce0d200 GS |
64 | if (dev) |
65 | return pfn_to_dma(dev, virt_to_pfn(addr)); | |
66 | ||
98ed7d4b RK |
67 | return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); |
68 | } | |
26ba47b1 | 69 | |
98ed7d4b | 70 | #else |
9eedd963 | 71 | static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) |
98ed7d4b | 72 | { |
9eedd963 | 73 | return __arch_pfn_to_dma(dev, pfn); |
98ed7d4b RK |
74 | } |
75 | ||
9eedd963 | 76 | static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) |
ef1baed8 | 77 | { |
9eedd963 | 78 | return __arch_dma_to_pfn(dev, addr); |
ef1baed8 RK |
79 | } |
80 | ||
98ed7d4b RK |
81 | static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) |
82 | { | |
83 | return __arch_dma_to_virt(dev, addr); | |
84 | } | |
85 | ||
86 | static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) | |
87 | { | |
88 | return __arch_virt_to_dma(dev, addr); | |
89 | } | |
90 | #endif | |
1fe53268 | 91 | |
26ba47b1 SS |
92 | /* The ARM override for dma_max_pfn() */ |
93 | static inline unsigned long dma_max_pfn(struct device *dev) | |
94 | { | |
d248220f | 95 | return dma_to_pfn(dev, *dev->dma_mask); |
26ba47b1 SS |
96 | } |
97 | #define dma_max_pfn(dev) dma_max_pfn(dev) | |
98 | ||
a3a60f81 | 99 | #define arch_setup_dma_ops arch_setup_dma_ops |
4bb25789 | 100 | extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, |
53c92d79 | 101 | const struct iommu_ops *iommu, bool coherent); |
4bb25789 WD |
102 | |
103 | #define arch_teardown_dma_ops arch_teardown_dma_ops | |
104 | extern void arch_teardown_dma_ops(struct device *dev); | |
812b99e4 | 105 | |
3d5391ac SS |
106 | /* do not use this function in a driver */ |
107 | static inline bool is_device_dma_coherent(struct device *dev) | |
108 | { | |
109 | return dev->archdata.dma_coherent; | |
110 | } | |
111 | ||
fbd989b1 SS |
112 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
113 | { | |
114 | unsigned int offset = paddr & ~PAGE_MASK; | |
115 | return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset; | |
116 | } | |
117 | ||
118 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) | |
119 | { | |
120 | unsigned int offset = dev_addr & ~PAGE_MASK; | |
121 | return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset; | |
122 | } | |
123 | ||
124 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) | |
125 | { | |
126 | u64 limit, mask; | |
127 | ||
128 | if (!dev->dma_mask) | |
129 | return 0; | |
130 | ||
131 | mask = *dev->dma_mask; | |
132 | ||
133 | limit = (mask + 1) & ~mask; | |
134 | if (limit && size > limit) | |
135 | return 0; | |
136 | ||
137 | if ((addr | (addr + size - 1)) & ~mask) | |
138 | return 0; | |
139 | ||
140 | return 1; | |
141 | } | |
142 | ||
143 | static inline void dma_mark_clean(void *addr, size_t size) { } | |
144 | ||
1da177e4 | 145 | /** |
f99d6034 | 146 | * arm_dma_alloc - allocate consistent memory for DMA |
1da177e4 LT |
147 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
148 | * @size: required memory size | |
149 | * @handle: bus-specific DMA address | |
f99d6034 | 150 | * @attrs: optinal attributes that specific mapping properties |
1da177e4 | 151 | * |
f99d6034 MS |
152 | * Allocate some memory for a device for performing DMA. This function |
153 | * allocates pages, and will return the CPU-viewed address, and sets @handle | |
154 | * to be the device-viewed address. | |
1da177e4 | 155 | */ |
f99d6034 | 156 | extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, |
00085f1e | 157 | gfp_t gfp, unsigned long attrs); |
f99d6034 | 158 | |
1da177e4 | 159 | /** |
f99d6034 | 160 | * arm_dma_free - free memory allocated by arm_dma_alloc |
1da177e4 LT |
161 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
162 | * @size: size of memory originally requested in dma_alloc_coherent | |
163 | * @cpu_addr: CPU-view address returned from dma_alloc_coherent | |
164 | * @handle: device-view address returned from dma_alloc_coherent | |
f99d6034 | 165 | * @attrs: optinal attributes that specific mapping properties |
1da177e4 LT |
166 | * |
167 | * Free (and unmap) a DMA buffer previously allocated by | |
f99d6034 | 168 | * arm_dma_alloc(). |
1da177e4 LT |
169 | * |
170 | * References to memory and mappings associated with cpu_addr/handle | |
171 | * during and after this call executing are illegal. | |
172 | */ | |
f99d6034 | 173 | extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr, |
00085f1e | 174 | dma_addr_t handle, unsigned long attrs); |
f99d6034 | 175 | |
1da177e4 | 176 | /** |
f99d6034 | 177 | * arm_dma_mmap - map a coherent DMA allocation into user space |
1da177e4 LT |
178 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
179 | * @vma: vm_area_struct describing requested user mapping | |
180 | * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent | |
181 | * @handle: device-view address returned from dma_alloc_coherent | |
182 | * @size: size of memory originally requested in dma_alloc_coherent | |
f99d6034 | 183 | * @attrs: optinal attributes that specific mapping properties |
1da177e4 LT |
184 | * |
185 | * Map a coherent DMA buffer previously allocated by dma_alloc_coherent | |
186 | * into user space. The coherent DMA buffer must not be freed by the | |
187 | * driver until the user space mapping has been released. | |
188 | */ | |
f99d6034 MS |
189 | extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, |
190 | void *cpu_addr, dma_addr_t dma_addr, size_t size, | |
00085f1e | 191 | unsigned long attrs); |
1da177e4 | 192 | |
6e5267aa MS |
193 | /* |
194 | * This can be called during early boot to increase the size of the atomic | |
195 | * coherent DMA pool above the default value of 256KiB. It must be called | |
196 | * before postcore_initcall. | |
197 | */ | |
198 | extern void __init init_dma_coherent_pool_size(unsigned long size); | |
199 | ||
8c8a0ec5 RK |
200 | /* |
201 | * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic" | |
202 | * and utilize bounce buffers as needed to work around limited DMA windows. | |
203 | * | |
204 | * On the SA-1111, a bug limits DMA to only certain regions of RAM. | |
205 | * On the IXP425, the PCI inbound window is 64MB (256MB total RAM) | |
206 | * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM) | |
207 | * | |
208 | * The following are helper functions used by the dmabounce subystem | |
209 | * | |
210 | */ | |
211 | ||
212 | /** | |
213 | * dmabounce_register_dev | |
214 | * | |
215 | * @dev: valid struct device pointer | |
216 | * @small_buf_size: size of buffers to use with small buffer pool | |
217 | * @large_buf_size: size of buffers to use with large buffer pool (can be 0) | |
0703ed2a | 218 | * @needs_bounce_fn: called to determine whether buffer needs bouncing |
8c8a0ec5 RK |
219 | * |
220 | * This function should be called by low-level platform code to register | |
221 | * a device as requireing DMA buffer bouncing. The function will allocate | |
222 | * appropriate DMA pools for the device. | |
8c8a0ec5 | 223 | */ |
3216a97b | 224 | extern int dmabounce_register_dev(struct device *, unsigned long, |
0703ed2a | 225 | unsigned long, int (*)(struct device *, dma_addr_t, size_t)); |
8c8a0ec5 RK |
226 | |
227 | /** | |
228 | * dmabounce_unregister_dev | |
229 | * | |
230 | * @dev: valid struct device pointer | |
231 | * | |
232 | * This function should be called by low-level platform code when device | |
233 | * that was previously registered with dmabounce_register_dev is removed | |
234 | * from the system. | |
235 | * | |
236 | */ | |
237 | extern void dmabounce_unregister_dev(struct device *); | |
238 | ||
8c8a0ec5 | 239 | |
24056f52 | 240 | |
afd1a321 RK |
241 | /* |
242 | * The scatter list versions of the above methods. | |
1da177e4 | 243 | */ |
2dc6a016 | 244 | extern int arm_dma_map_sg(struct device *, struct scatterlist *, int, |
00085f1e | 245 | enum dma_data_direction, unsigned long attrs); |
2dc6a016 | 246 | extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int, |
00085f1e | 247 | enum dma_data_direction, unsigned long attrs); |
2dc6a016 | 248 | extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int, |
3216a97b | 249 | enum dma_data_direction); |
2dc6a016 | 250 | extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int, |
3216a97b | 251 | enum dma_data_direction); |
dc2832e1 MS |
252 | extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt, |
253 | void *cpu_addr, dma_addr_t dma_addr, size_t size, | |
00085f1e | 254 | unsigned long attrs); |
1da177e4 | 255 | |
1da177e4 LT |
256 | #endif /* __KERNEL__ */ |
257 | #endif |