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1 | /* |
2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
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_continuous_data(x) ((struct device *)(unsigned long)(x)) |
41 | #endif |
42 | |
43 | |
44 | /* |
45 | * buffer types |
46 | */ |
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 | #ifdef CONFIG_SND_DMA_SGBUF |
51 | #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ |
52 | #else |
53 | #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ |
54 | #endif |
55 | |
56 | /* |
57 | * info for buffer allocation |
58 | */ |
59 | struct snd_dma_buffer { |
60 | struct snd_dma_device dev; /* device type */ |
61 | unsigned char *area; /* virtual pointer */ |
62 | dma_addr_t addr; /* physical address */ |
63 | size_t bytes; /* buffer size in bytes */ |
64 | void *private_data; /* private for allocator; don't touch */ |
65 | }; |
66 | |
67 | #ifdef CONFIG_SND_DMA_SGBUF |
68 | /* |
69 | * Scatter-Gather generic device pages |
70 | */ |
71 | void *snd_malloc_sgbuf_pages(struct device *device, |
72 | size_t size, struct snd_dma_buffer *dmab, |
73 | size_t *res_size); |
74 | int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); |
75 | |
76 | struct snd_sg_page { |
77 | void *buf; |
78 | dma_addr_t addr; |
79 | }; |
80 | |
81 | struct snd_sg_buf { |
82 | int size; /* allocated byte size */ |
83 | int pages; /* allocated pages */ |
84 | int tblsize; /* allocated table size */ |
85 | struct snd_sg_page *table; /* address table */ |
86 | struct page **page_table; /* page table (for vmap/vunmap) */ |
87 | struct device *dev; |
88 | }; |
89 | |
90 | /* |
91 | * return the pages matching with the given byte size |
92 | */ |
93 | static inline unsigned int snd_sgbuf_aligned_pages(size_t size) |
94 | { |
95 | return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
96 | } |
97 | |
98 | /* |
99 | * return the physical address at the corresponding offset |
100 | */ |
101 | static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset) |
102 | { |
103 | dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; |
104 | addr &= PAGE_MASK; |
105 | return addr + offset % PAGE_SIZE; |
106 | } |
107 | |
108 | /* |
109 | * return the virtual address at the corresponding offset |
110 | */ |
111 | static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset) |
112 | { |
113 | return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; |
114 | } |
115 | #endif /* CONFIG_SND_DMA_SGBUF */ |
116 | |
117 | /* allocate/release a buffer */ |
118 | int snd_dma_alloc_pages(int type, struct device *dev, size_t size, |
119 | struct snd_dma_buffer *dmab); |
120 | int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, |
121 | struct snd_dma_buffer *dmab); |
122 | void snd_dma_free_pages(struct snd_dma_buffer *dmab); |
123 | |
124 | /* buffer-preservation managements */ |
125 | |
126 | #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device) |
127 | |
128 | size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id); |
129 | int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id); |
130 | |
131 | /* basic memory allocation functions */ |
132 | void *snd_malloc_pages(size_t size, gfp_t gfp_flags); |
133 | void snd_free_pages(void *ptr, size_t size); |
134 | |
135 | #endif /* __SOUND_MEMALLOC_H */ |
136 | |
137 |
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