2 * Copyright (C) 2004 IBM
4 * Implements the generic device dma API for powerpc.
5 * the pci and vio busses
7 #ifndef _ASM_DMA_MAPPING_H
8 #define _ASM_DMA_MAPPING_H
11 #include <linux/types.h>
12 #include <linux/cache.h>
13 /* need struct page definitions */
15 #include <linux/scatterlist.h>
16 #include <linux/dma-attrs.h>
17 #include <linux/dma-debug.h>
19 #include <asm/swiotlb.h>
21 #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
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 struct dma_attrs *attrs);
27 extern void __dma_direct_free_coherent(struct device *dev, size_t size,
28 void *vaddr, dma_addr_t dma_handle,
29 struct dma_attrs *attrs);
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);
35 #ifdef CONFIG_NOT_COHERENT_CACHE
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.
44 extern void *__dma_alloc_coherent(struct device *dev, size_t size,
45 dma_addr_t *handle, gfp_t gfp);
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);
50 extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr);
52 #else /* ! CONFIG_NOT_COHERENT_CACHE */
54 * Cache coherent cores.
57 #define __dma_alloc_coherent(dev, gfp, size, handle) NULL
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)
62 #endif /* ! CONFIG_NOT_COHERENT_CACHE */
64 static inline unsigned long device_to_mask(struct device *dev)
66 if (dev->dma_mask && *dev->dma_mask)
67 return *dev->dma_mask;
68 /* Assume devices without mask can take 32 bit addresses */
73 * Available generic sets of operations
76 extern struct dma_map_ops dma_iommu_ops;
78 extern struct dma_map_ops dma_direct_ops;
80 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
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.
87 if (unlikely(dev == NULL))
90 return dev->archdata.dma_ops;
93 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
95 dev->archdata.dma_ops = ops;
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
106 static inline dma_addr_t get_dma_offset(struct device *dev)
109 return dev->archdata.dma_offset;
111 return PCI_DRAM_OFFSET;
114 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
117 dev->archdata.dma_offset = off;
120 /* this will be removed soon */
121 #define flush_write_buffers()
123 #include <asm-generic/dma-mapping-common.h>
125 static inline int dma_supported(struct device *dev, u64 mask)
127 struct dma_map_ops *dma_ops = get_dma_ops(dev);
129 if (unlikely(dma_ops == NULL))
131 if (dma_ops->dma_supported == NULL)
133 return dma_ops->dma_supported(dev, mask);
136 extern int dma_set_mask(struct device *dev, u64 dma_mask);
137 extern int __dma_set_mask(struct device *dev, u64 dma_mask);
138 extern u64 __dma_get_required_mask(struct device *dev);
140 #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
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)
146 struct dma_map_ops *dma_ops = get_dma_ops(dev);
151 cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
153 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
158 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
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)
164 struct dma_map_ops *dma_ops = get_dma_ops(dev);
168 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
170 dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
173 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
175 struct dma_map_ops *dma_ops = get_dma_ops(dev);
177 debug_dma_mapping_error(dev, dma_addr);
178 if (dma_ops->mapping_error)
179 return dma_ops->mapping_error(dev, dma_addr);
182 return (dma_addr == DMA_ERROR_CODE);
188 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
190 #ifdef CONFIG_SWIOTLB
191 struct dev_archdata *sd = &dev->archdata;
193 if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
200 return addr + size - 1 <= *dev->dma_mask;
203 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
205 return paddr + get_dma_offset(dev);
208 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
210 return daddr - get_dma_offset(dev);
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)
216 #define ARCH_HAS_DMA_MMAP_COHERENT
218 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
219 enum dma_data_direction direction)
221 BUG_ON(direction == DMA_NONE);
222 __dma_sync(vaddr, size, (int)direction);
225 #endif /* __KERNEL__ */
226 #endif /* _ASM_DMA_MAPPING_H */