Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 IBM |
| 3 | * |
| 4 | * Implements the generic device dma API for powerpc. |
| 5 | * the pci and vio busses |
| 6 | */ |
| 7 | #ifndef _ASM_DMA_MAPPING_H |
| 8 | #define _ASM_DMA_MAPPING_H |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 9 | #ifdef __KERNEL__ |
| 10 | |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/cache.h> |
| 13 | /* need struct page definitions */ |
| 14 | #include <linux/mm.h> |
| 15 | #include <linux/scatterlist.h> |
Mark Nelson | 3affedc | 2008-07-05 05:05:42 +1000 | [diff] [blame] | 16 | #include <linux/dma-attrs.h> |
FUJITA Tomonori | 46bab4e | 2009-08-04 19:08:26 +0000 | [diff] [blame] | 17 | #include <linux/dma-debug.h> |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 18 | #include <asm/io.h> |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 19 | #include <asm/swiotlb.h> |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 20 | |
| 21 | #define DMA_ERROR_CODE (~(dma_addr_t)0x0) |
| 22 | |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 23 | /* Some dma direct funcs must be visible for use in other dma_ops */ |
| 24 | extern void *dma_direct_alloc_coherent(struct device *dev, size_t size, |
Andrzej Pietrasiewicz | bfbf7d6 | 2011-12-06 14:14:46 +0100 | [diff] [blame] | 25 | dma_addr_t *dma_handle, gfp_t flag, |
| 26 | struct dma_attrs *attrs); |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 27 | extern void dma_direct_free_coherent(struct device *dev, size_t size, |
Andrzej Pietrasiewicz | bfbf7d6 | 2011-12-06 14:14:46 +0100 | [diff] [blame] | 28 | void *vaddr, dma_addr_t dma_handle, |
| 29 | struct dma_attrs *attrs); |
Marek Szyprowski | 64ccc9c | 2012-06-14 13:03:04 +0200 | [diff] [blame] | 30 | extern int dma_direct_mmap_coherent(struct device *dev, |
| 31 | struct vm_area_struct *vma, |
| 32 | void *cpu_addr, dma_addr_t handle, |
| 33 | size_t size, struct dma_attrs *attrs); |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 34 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 35 | #ifdef CONFIG_NOT_COHERENT_CACHE |
| 36 | /* |
| 37 | * DMA-consistent mapping functions for PowerPCs that don't support |
| 38 | * cache snooping. These allocate/free a region of uncached mapped |
| 39 | * memory space for use with DMA devices. Alternatively, you could |
| 40 | * allocate the space "normally" and use the cache management functions |
| 41 | * to ensure it is consistent. |
| 42 | */ |
Benjamin Herrenschmidt | 8b31e49 | 2009-05-27 13:50:33 +1000 | [diff] [blame] | 43 | struct device; |
| 44 | extern void *__dma_alloc_coherent(struct device *dev, size_t size, |
| 45 | dma_addr_t *handle, gfp_t gfp); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 46 | extern void __dma_free_coherent(size_t size, void *vaddr); |
| 47 | extern void __dma_sync(void *vaddr, size_t size, int direction); |
| 48 | extern void __dma_sync_page(struct page *page, unsigned long offset, |
| 49 | size_t size, int direction); |
Benjamin Herrenschmidt | 6090912 | 2011-03-24 20:50:06 +0000 | [diff] [blame] | 50 | extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 51 | |
| 52 | #else /* ! CONFIG_NOT_COHERENT_CACHE */ |
| 53 | /* |
| 54 | * Cache coherent cores. |
| 55 | */ |
| 56 | |
Benjamin Herrenschmidt | 8b31e49 | 2009-05-27 13:50:33 +1000 | [diff] [blame] | 57 | #define __dma_alloc_coherent(dev, gfp, size, handle) NULL |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 58 | #define __dma_free_coherent(size, addr) ((void)0) |
| 59 | #define __dma_sync(addr, size, rw) ((void)0) |
| 60 | #define __dma_sync_page(pg, off, sz, rw) ((void)0) |
| 61 | |
| 62 | #endif /* ! CONFIG_NOT_COHERENT_CACHE */ |
| 63 | |
Mark Nelson | 3a4c6f0 | 2008-07-05 05:05:45 +1000 | [diff] [blame] | 64 | static inline unsigned long device_to_mask(struct device *dev) |
| 65 | { |
| 66 | if (dev->dma_mask && *dev->dma_mask) |
| 67 | return *dev->dma_mask; |
| 68 | /* Assume devices without mask can take 32 bit addresses */ |
| 69 | return 0xfffffffful; |
| 70 | } |
| 71 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 72 | /* |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 73 | * Available generic sets of operations |
| 74 | */ |
| 75 | #ifdef CONFIG_PPC64 |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 76 | extern struct dma_map_ops dma_iommu_ops; |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 77 | #endif |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 78 | extern struct dma_map_ops dma_direct_ops; |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 79 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 80 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 81 | { |
| 82 | /* We don't handle the NULL dev case for ISA for now. We could |
| 83 | * do it via an out of line call but it is not needed for now. The |
| 84 | * only ISA DMA device we support is the floppy and we have a hack |
| 85 | * in the floppy driver directly to get a device for us. |
| 86 | */ |
Kumar Gala | 4ae0ff6 | 2009-03-19 03:40:52 +0000 | [diff] [blame] | 87 | if (unlikely(dev == NULL)) |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 88 | return NULL; |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 89 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 90 | return dev->archdata.dma_ops; |
| 91 | } |
| 92 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 93 | static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops) |
Michael Ellerman | 1f62a16 | 2008-01-30 01:13:58 +1100 | [diff] [blame] | 94 | { |
| 95 | dev->archdata.dma_ops = ops; |
| 96 | } |
| 97 | |
Becky Bruce | 1cebd7a | 2009-09-21 08:26:34 +0000 | [diff] [blame] | 98 | /* |
| 99 | * get_dma_offset() |
| 100 | * |
| 101 | * Get the dma offset on configurations where the dma address can be determined |
| 102 | * from the physical address by looking at a simple offset. Direct dma and |
| 103 | * swiotlb use this function, but it is typically not used by implementations |
| 104 | * with an iommu. |
| 105 | */ |
Becky Bruce | 738ef42 | 2009-09-21 08:26:35 +0000 | [diff] [blame] | 106 | static inline dma_addr_t get_dma_offset(struct device *dev) |
Becky Bruce | 1cebd7a | 2009-09-21 08:26:34 +0000 | [diff] [blame] | 107 | { |
| 108 | if (dev) |
Becky Bruce | 738ef42 | 2009-09-21 08:26:35 +0000 | [diff] [blame] | 109 | return dev->archdata.dma_data.dma_offset; |
Becky Bruce | 1cebd7a | 2009-09-21 08:26:34 +0000 | [diff] [blame] | 110 | |
| 111 | return PCI_DRAM_OFFSET; |
| 112 | } |
| 113 | |
Becky Bruce | 738ef42 | 2009-09-21 08:26:35 +0000 | [diff] [blame] | 114 | static inline void set_dma_offset(struct device *dev, dma_addr_t off) |
| 115 | { |
| 116 | if (dev) |
| 117 | dev->archdata.dma_data.dma_offset = off; |
| 118 | } |
| 119 | |
FUJITA Tomonori | 46bab4e | 2009-08-04 19:08:26 +0000 | [diff] [blame] | 120 | /* this will be removed soon */ |
| 121 | #define flush_write_buffers() |
| 122 | |
| 123 | #include <asm-generic/dma-mapping-common.h> |
| 124 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 125 | static inline int dma_supported(struct device *dev, u64 mask) |
| 126 | { |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 127 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 128 | |
| 129 | if (unlikely(dma_ops == NULL)) |
| 130 | return 0; |
| 131 | if (dma_ops->dma_supported == NULL) |
| 132 | return 1; |
| 133 | return dma_ops->dma_supported(dev, mask); |
| 134 | } |
| 135 | |
Benjamin Herrenschmidt | 5b6e9ff | 2010-08-30 19:23:52 +0000 | [diff] [blame] | 136 | extern int dma_set_mask(struct device *dev, u64 dma_mask); |
Benjamin Herrenschmidt | cd15b04 | 2014-02-11 11:32:38 +1100 | [diff] [blame] | 137 | extern int __dma_set_mask(struct device *dev, u64 dma_mask); |
Gavin Shan | fe7e85c | 2014-09-30 12:39:10 +1000 | [diff] [blame] | 138 | extern u64 __dma_get_required_mask(struct device *dev); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 139 | |
Andrzej Pietrasiewicz | bfbf7d6 | 2011-12-06 14:14:46 +0100 | [diff] [blame] | 140 | #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL) |
| 141 | |
| 142 | static inline void *dma_alloc_attrs(struct device *dev, size_t size, |
| 143 | dma_addr_t *dma_handle, gfp_t flag, |
| 144 | struct dma_attrs *attrs) |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 145 | { |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 146 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
FUJITA Tomonori | 80d3e8a | 2009-08-04 19:08:28 +0000 | [diff] [blame] | 147 | void *cpu_addr; |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 148 | |
| 149 | BUG_ON(!dma_ops); |
FUJITA Tomonori | 80d3e8a | 2009-08-04 19:08:28 +0000 | [diff] [blame] | 150 | |
Andrzej Pietrasiewicz | bfbf7d6 | 2011-12-06 14:14:46 +0100 | [diff] [blame] | 151 | cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs); |
FUJITA Tomonori | 80d3e8a | 2009-08-04 19:08:28 +0000 | [diff] [blame] | 152 | |
| 153 | debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr); |
| 154 | |
| 155 | return cpu_addr; |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 156 | } |
| 157 | |
Andrzej Pietrasiewicz | bfbf7d6 | 2011-12-06 14:14:46 +0100 | [diff] [blame] | 158 | #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL) |
| 159 | |
| 160 | static inline void dma_free_attrs(struct device *dev, size_t size, |
| 161 | void *cpu_addr, dma_addr_t dma_handle, |
| 162 | struct dma_attrs *attrs) |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 163 | { |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 164 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 165 | |
| 166 | BUG_ON(!dma_ops); |
FUJITA Tomonori | 80d3e8a | 2009-08-04 19:08:28 +0000 | [diff] [blame] | 167 | |
| 168 | debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); |
| 169 | |
Andrzej Pietrasiewicz | bfbf7d6 | 2011-12-06 14:14:46 +0100 | [diff] [blame] | 170 | dma_ops->free(dev, size, cpu_addr, dma_handle, attrs); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 171 | } |
| 172 | |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 173 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 174 | { |
FUJITA Tomonori | 4a9a6bf | 2009-08-04 19:08:27 +0000 | [diff] [blame] | 175 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
| 176 | |
Shuah Khan | 34daa88 | 2012-11-23 14:35:36 -0700 | [diff] [blame] | 177 | debug_dma_mapping_error(dev, dma_addr); |
FUJITA Tomonori | 4a9a6bf | 2009-08-04 19:08:27 +0000 | [diff] [blame] | 178 | if (dma_ops->mapping_error) |
| 179 | return dma_ops->mapping_error(dev, dma_addr); |
| 180 | |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 181 | #ifdef CONFIG_PPC64 |
| 182 | return (dma_addr == DMA_ERROR_CODE); |
| 183 | #else |
| 184 | return 0; |
| 185 | #endif |
| 186 | } |
| 187 | |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 188 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
| 189 | { |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 190 | #ifdef CONFIG_SWIOTLB |
| 191 | struct dev_archdata *sd = &dev->archdata; |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 192 | |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 193 | if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr) |
Joe Perches | acdb668 | 2015-03-30 16:46:04 -0700 | [diff] [blame] | 194 | return false; |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 195 | #endif |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 196 | |
| 197 | if (!dev->dma_mask) |
Joe Perches | acdb668 | 2015-03-30 16:46:04 -0700 | [diff] [blame] | 198 | return false; |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 199 | |
Jan Beulich | ac2b3e6 | 2009-12-15 16:47:43 -0800 | [diff] [blame] | 200 | return addr + size - 1 <= *dev->dma_mask; |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 201 | } |
| 202 | |
FUJITA Tomonori | 8d4f533 | 2009-07-10 10:05:01 +0900 | [diff] [blame] | 203 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
| 204 | { |
Becky Bruce | 1cebd7a | 2009-09-21 08:26:34 +0000 | [diff] [blame] | 205 | return paddr + get_dma_offset(dev); |
FUJITA Tomonori | 8d4f533 | 2009-07-10 10:05:01 +0900 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) |
| 209 | { |
Becky Bruce | 1cebd7a | 2009-09-21 08:26:34 +0000 | [diff] [blame] | 210 | return daddr - get_dma_offset(dev); |
FUJITA Tomonori | 8d4f533 | 2009-07-10 10:05:01 +0900 | [diff] [blame] | 211 | } |
| 212 | |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 213 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) |
| 214 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 215 | |
Benjamin Herrenschmidt | 6090912 | 2011-03-24 20:50:06 +0000 | [diff] [blame] | 216 | #define ARCH_HAS_DMA_MMAP_COHERENT |
| 217 | |
Ralf Baechle | d3fa72e | 2006-12-06 20:38:56 -0800 | [diff] [blame] | 218 | static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 219 | enum dma_data_direction direction) |
| 220 | { |
| 221 | BUG_ON(direction == DMA_NONE); |
| 222 | __dma_sync(vaddr, size, (int)direction); |
| 223 | } |
| 224 | |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 225 | #endif /* __KERNEL__ */ |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 226 | #endif /* _ASM_DMA_MAPPING_H */ |