Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c1017a4c | 2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
3 | * Takashi Iwai <tiwai@suse.de> |
4 | * | |
5 | * Generic memory allocators | |
6 | * | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #ifndef __SOUND_MEMALLOC_H | |
25 | #define __SOUND_MEMALLOC_H | |
26 | ||
27 | struct device; | |
28 | ||
29 | /* | |
30 | * buffer device info | |
31 | */ | |
32 | struct snd_dma_device { | |
33 | int type; /* SNDRV_DMA_TYPE_XXX */ | |
34 | struct device *dev; /* generic device */ | |
35 | }; | |
36 | ||
37 | #ifndef snd_dma_pci_data | |
38 | #define snd_dma_pci_data(pci) (&(pci)->dev) | |
39 | #define snd_dma_isa_data() NULL | |
40 | #define snd_dma_sbus_data(sbus) ((struct device *)(sbus)) | |
41 | #define snd_dma_continuous_data(x) ((struct device *)(unsigned long)(x)) | |
42 | #endif | |
43 | ||
44 | ||
45 | /* | |
46 | * buffer types | |
47 | */ | |
48 | #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */ | |
49 | #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */ | |
50 | #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */ | |
51 | #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ | |
52 | #define SNDRV_DMA_TYPE_SBUS 4 /* SBUS continuous */ | |
53 | ||
54 | /* | |
55 | * info for buffer allocation | |
56 | */ | |
57 | struct snd_dma_buffer { | |
58 | struct snd_dma_device dev; /* device type */ | |
59 | unsigned char *area; /* virtual pointer */ | |
60 | dma_addr_t addr; /* physical address */ | |
61 | size_t bytes; /* buffer size in bytes */ | |
62 | void *private_data; /* private for allocator; don't touch */ | |
63 | }; | |
64 | ||
65 | /* | |
66 | * Scatter-Gather generic device pages | |
67 | */ | |
68 | struct snd_sg_page { | |
69 | void *buf; | |
70 | dma_addr_t addr; | |
71 | }; | |
72 | ||
73 | struct snd_sg_buf { | |
74 | int size; /* allocated byte size */ | |
75 | int pages; /* allocated pages */ | |
76 | int tblsize; /* allocated table size */ | |
77 | struct snd_sg_page *table; /* address table */ | |
78 | struct page **page_table; /* page table (for vmap/vunmap) */ | |
79 | struct device *dev; | |
80 | }; | |
81 | ||
82 | /* | |
83 | * return the pages matching with the given byte size | |
84 | */ | |
85 | static inline unsigned int snd_sgbuf_aligned_pages(size_t size) | |
86 | { | |
87 | return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
88 | } | |
89 | ||
90 | /* | |
91 | * return the physical address at the corresponding offset | |
92 | */ | |
93 | static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset) | |
94 | { | |
95 | return sgbuf->table[offset >> PAGE_SHIFT].addr + offset % PAGE_SIZE; | |
96 | } | |
97 | ||
98 | ||
99 | /* allocate/release a buffer */ | |
100 | int snd_dma_alloc_pages(int type, struct device *dev, size_t size, | |
101 | struct snd_dma_buffer *dmab); | |
102 | int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, | |
103 | struct snd_dma_buffer *dmab); | |
104 | void snd_dma_free_pages(struct snd_dma_buffer *dmab); | |
105 | ||
106 | /* buffer-preservation managements */ | |
107 | ||
108 | #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device) | |
109 | ||
110 | size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id); | |
111 | int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id); | |
112 | ||
113 | /* basic memory allocation functions */ | |
1ef64e67 | 114 | void *snd_malloc_pages(size_t size, gfp_t gfp_flags); |
1da177e4 LT |
115 | void snd_free_pages(void *ptr, size_t size); |
116 | ||
117 | #endif /* __SOUND_MEMALLOC_H */ | |
118 |