5 * Generic memory allocators
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24 #ifndef __SOUND_MEMALLOC_H
25 #define __SOUND_MEMALLOC_H
34 struct snd_dma_device {
35 int type; /* SNDRV_DMA_TYPE_XXX */
36 struct device *dev; /* generic device */
39 #define snd_dma_pci_data(pci) (&(pci)->dev)
40 #define snd_dma_isa_data() NULL
41 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
47 #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
48 #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
49 #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
50 #define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */
51 #ifdef CONFIG_SND_DMA_SGBUF
52 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
53 #define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
55 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
56 #define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
58 #ifdef CONFIG_GENERIC_ALLOCATOR
59 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
61 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
65 * info for buffer allocation
67 struct snd_dma_buffer {
68 struct snd_dma_device dev; /* device type */
69 unsigned char *area; /* virtual pointer */
70 dma_addr_t addr; /* physical address */
71 size_t bytes; /* buffer size in bytes */
72 void *private_data; /* private for allocator; don't touch */
76 * return the pages matching with the given byte size
78 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
80 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
83 #ifdef CONFIG_SND_DMA_SGBUF
85 * Scatter-Gather generic device pages
87 void *snd_malloc_sgbuf_pages(struct device *device,
88 size_t size, struct snd_dma_buffer *dmab,
90 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
98 int size; /* allocated byte size */
99 int pages; /* allocated pages */
100 int tblsize; /* allocated table size */
101 struct snd_sg_page *table; /* address table */
102 struct page **page_table; /* page table (for vmap/vunmap) */
107 * return the physical address at the corresponding offset
109 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
112 struct snd_sg_buf *sgbuf = dmab->private_data;
113 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
114 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
115 return addr + offset % PAGE_SIZE;
119 * return the virtual address at the corresponding offset
121 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
124 struct snd_sg_buf *sgbuf = dmab->private_data;
125 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
128 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
129 unsigned int ofs, unsigned int size);
131 /* non-SG versions */
132 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
135 return dmab->addr + offset;
138 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
141 return dmab->area + offset;
144 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
146 #endif /* CONFIG_SND_DMA_SGBUF */
148 /* allocate/release a buffer */
149 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
150 struct snd_dma_buffer *dmab);
151 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
152 struct snd_dma_buffer *dmab);
153 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
155 /* basic memory allocation functions */
156 void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
157 void snd_free_pages(void *ptr, size_t size);
159 #endif /* __SOUND_MEMALLOC_H */