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, |
| 25 | dma_addr_t *dma_handle, gfp_t flag); |
| 26 | extern void dma_direct_free_coherent(struct device *dev, size_t size, |
| 27 | void *vaddr, dma_addr_t dma_handle); |
| 28 | |
| 29 | extern unsigned long get_dma_direct_offset(struct device *dev); |
| 30 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 31 | #ifdef CONFIG_NOT_COHERENT_CACHE |
| 32 | /* |
| 33 | * DMA-consistent mapping functions for PowerPCs that don't support |
| 34 | * cache snooping. These allocate/free a region of uncached mapped |
| 35 | * memory space for use with DMA devices. Alternatively, you could |
| 36 | * allocate the space "normally" and use the cache management functions |
| 37 | * to ensure it is consistent. |
| 38 | */ |
Benjamin Herrenschmidt | 8b31e49 | 2009-05-27 13:50:33 +1000 | [diff] [blame] | 39 | struct device; |
| 40 | extern void *__dma_alloc_coherent(struct device *dev, size_t size, |
| 41 | dma_addr_t *handle, gfp_t gfp); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 42 | extern void __dma_free_coherent(size_t size, void *vaddr); |
| 43 | extern void __dma_sync(void *vaddr, size_t size, int direction); |
| 44 | extern void __dma_sync_page(struct page *page, unsigned long offset, |
| 45 | size_t size, int direction); |
| 46 | |
| 47 | #else /* ! CONFIG_NOT_COHERENT_CACHE */ |
| 48 | /* |
| 49 | * Cache coherent cores. |
| 50 | */ |
| 51 | |
Benjamin Herrenschmidt | 8b31e49 | 2009-05-27 13:50:33 +1000 | [diff] [blame] | 52 | #define __dma_alloc_coherent(dev, gfp, size, handle) NULL |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 53 | #define __dma_free_coherent(size, addr) ((void)0) |
| 54 | #define __dma_sync(addr, size, rw) ((void)0) |
| 55 | #define __dma_sync_page(pg, off, sz, rw) ((void)0) |
| 56 | |
| 57 | #endif /* ! CONFIG_NOT_COHERENT_CACHE */ |
| 58 | |
Mark Nelson | 3a4c6f0 | 2008-07-05 05:05:45 +1000 | [diff] [blame] | 59 | static inline unsigned long device_to_mask(struct device *dev) |
| 60 | { |
| 61 | if (dev->dma_mask && *dev->dma_mask) |
| 62 | return *dev->dma_mask; |
| 63 | /* Assume devices without mask can take 32 bit addresses */ |
| 64 | return 0xfffffffful; |
| 65 | } |
| 66 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 67 | /* |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 68 | * Available generic sets of operations |
| 69 | */ |
| 70 | #ifdef CONFIG_PPC64 |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 71 | extern struct dma_map_ops dma_iommu_ops; |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 72 | #endif |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 73 | extern struct dma_map_ops dma_direct_ops; |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 74 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 75 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 76 | { |
| 77 | /* We don't handle the NULL dev case for ISA for now. We could |
| 78 | * do it via an out of line call but it is not needed for now. The |
| 79 | * only ISA DMA device we support is the floppy and we have a hack |
| 80 | * in the floppy driver directly to get a device for us. |
| 81 | */ |
Kumar Gala | 4ae0ff6 | 2009-03-19 03:40:52 +0000 | [diff] [blame] | 82 | if (unlikely(dev == NULL)) |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 83 | return NULL; |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 84 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 85 | return dev->archdata.dma_ops; |
| 86 | } |
| 87 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 88 | 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] | 89 | { |
| 90 | dev->archdata.dma_ops = ops; |
| 91 | } |
| 92 | |
FUJITA Tomonori | 46bab4e | 2009-08-04 19:08:26 +0000 | [diff] [blame] | 93 | /* this will be removed soon */ |
| 94 | #define flush_write_buffers() |
| 95 | |
| 96 | #include <asm-generic/dma-mapping-common.h> |
| 97 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 98 | static inline int dma_supported(struct device *dev, u64 mask) |
| 99 | { |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 100 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 101 | |
| 102 | if (unlikely(dma_ops == NULL)) |
| 103 | return 0; |
| 104 | if (dma_ops->dma_supported == NULL) |
| 105 | return 1; |
| 106 | return dma_ops->dma_supported(dev, mask); |
| 107 | } |
| 108 | |
Michael Ellerman | 84631f3 | 2007-12-17 17:35:53 +1100 | [diff] [blame] | 109 | /* We have our own implementation of pci_set_dma_mask() */ |
| 110 | #define HAVE_ARCH_PCI_SET_DMA_MASK |
| 111 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 112 | static inline int dma_set_mask(struct device *dev, u64 dma_mask) |
| 113 | { |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 114 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 115 | |
| 116 | if (unlikely(dma_ops == NULL)) |
| 117 | return -EIO; |
| 118 | if (dma_ops->set_dma_mask != NULL) |
| 119 | return dma_ops->set_dma_mask(dev, dma_mask); |
| 120 | if (!dev->dma_mask || !dma_supported(dev, dma_mask)) |
| 121 | return -EIO; |
| 122 | *dev->dma_mask = dma_mask; |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | static inline void *dma_alloc_coherent(struct device *dev, size_t size, |
| 127 | dma_addr_t *dma_handle, gfp_t flag) |
| 128 | { |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 129 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
FUJITA Tomonori | 80d3e8a | 2009-08-04 19:08:28 +0000 | [diff] [blame] | 130 | void *cpu_addr; |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 131 | |
| 132 | BUG_ON(!dma_ops); |
FUJITA Tomonori | 80d3e8a | 2009-08-04 19:08:28 +0000 | [diff] [blame] | 133 | |
| 134 | cpu_addr = dma_ops->alloc_coherent(dev, size, dma_handle, flag); |
| 135 | |
| 136 | debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr); |
| 137 | |
| 138 | return cpu_addr; |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | static inline void dma_free_coherent(struct device *dev, size_t size, |
| 142 | void *cpu_addr, dma_addr_t dma_handle) |
| 143 | { |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 144 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 145 | |
| 146 | BUG_ON(!dma_ops); |
FUJITA Tomonori | 80d3e8a | 2009-08-04 19:08:28 +0000 | [diff] [blame] | 147 | |
| 148 | debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); |
| 149 | |
Anton Blanchard | 33ff910 | 2007-10-16 14:54:33 -0500 | [diff] [blame] | 150 | dma_ops->free_coherent(dev, size, cpu_addr, dma_handle); |
| 151 | } |
| 152 | |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 153 | 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] | 154 | { |
FUJITA Tomonori | 4a9a6bf | 2009-08-04 19:08:27 +0000 | [diff] [blame] | 155 | struct dma_map_ops *dma_ops = get_dma_ops(dev); |
| 156 | |
| 157 | if (dma_ops->mapping_error) |
| 158 | return dma_ops->mapping_error(dev, dma_addr); |
| 159 | |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 160 | #ifdef CONFIG_PPC64 |
| 161 | return (dma_addr == DMA_ERROR_CODE); |
| 162 | #else |
| 163 | return 0; |
| 164 | #endif |
| 165 | } |
| 166 | |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 167 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
| 168 | { |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 169 | #ifdef CONFIG_SWIOTLB |
| 170 | struct dev_archdata *sd = &dev->archdata; |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 171 | |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 172 | if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr) |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 173 | return 0; |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 174 | #endif |
FUJITA Tomonori | 9a937c9 | 2009-07-10 10:04:57 +0900 | [diff] [blame] | 175 | |
| 176 | if (!dev->dma_mask) |
| 177 | return 0; |
| 178 | |
| 179 | return addr + size <= *dev->dma_mask; |
| 180 | } |
| 181 | |
FUJITA Tomonori | 8d4f533 | 2009-07-10 10:05:01 +0900 | [diff] [blame] | 182 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
| 183 | { |
| 184 | return paddr + get_dma_direct_offset(dev); |
| 185 | } |
| 186 | |
| 187 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) |
| 188 | { |
| 189 | return daddr - get_dma_direct_offset(dev); |
| 190 | } |
| 191 | |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 192 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) |
| 193 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) |
| 194 | #ifdef CONFIG_NOT_COHERENT_CACHE |
Ralf Baechle | f67637e | 2006-12-06 20:38:54 -0800 | [diff] [blame] | 195 | #define dma_is_consistent(d, h) (0) |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 196 | #else |
Ralf Baechle | f67637e | 2006-12-06 20:38:54 -0800 | [diff] [blame] | 197 | #define dma_is_consistent(d, h) (1) |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 198 | #endif |
| 199 | |
| 200 | static inline int dma_get_cache_alignment(void) |
| 201 | { |
| 202 | #ifdef CONFIG_PPC64 |
| 203 | /* no easy way to get cache size on all processors, so return |
| 204 | * the maximum possible, to be safe */ |
Ravikiran G Thirumalai | 1fd73c6 | 2006-01-08 01:01:28 -0800 | [diff] [blame] | 205 | return (1 << INTERNODE_CACHE_SHIFT); |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 206 | #else |
| 207 | /* |
| 208 | * Each processor family will define its own L1_CACHE_SHIFT, |
| 209 | * L1_CACHE_BYTES wraps to this, so this is always safe. |
| 210 | */ |
| 211 | return L1_CACHE_BYTES; |
| 212 | #endif |
| 213 | } |
| 214 | |
Ralf Baechle | d3fa72e | 2006-12-06 20:38:56 -0800 | [diff] [blame] | 215 | 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] | 216 | enum dma_data_direction direction) |
| 217 | { |
| 218 | BUG_ON(direction == DMA_NONE); |
| 219 | __dma_sync(vaddr, size, (int)direction); |
| 220 | } |
| 221 | |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 222 | #endif /* __KERNEL__ */ |
Stephen Rothwell | 78b0973 | 2005-11-19 01:40:46 +1100 | [diff] [blame] | 223 | #endif /* _ASM_DMA_MAPPING_H */ |