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 #include <asm/page.h>
28
29 struct device;
30
31 /*
32 * buffer device info
33 */
34 struct snd_dma_device {
35 int type; /* SNDRV_DMA_TYPE_XXX */
36 struct device *dev; /* generic device */
37 };
38
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))
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 #ifdef CONFIG_GENERIC_ALLOCATOR
56 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
57 #else
58 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
59 #endif
60
61 /*
62 * info for buffer allocation
63 */
64 struct snd_dma_buffer {
65 struct snd_dma_device dev; /* device type */
66 unsigned char *area; /* virtual pointer */
67 dma_addr_t addr; /* physical address */
68 size_t bytes; /* buffer size in bytes */
69 void *private_data; /* private for allocator; don't touch */
70 };
71
72 /*
73 * return the pages matching with the given byte size
74 */
snd_sgbuf_aligned_pages(size_t size)75 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
76 {
77 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
78 }
79
80 #ifdef CONFIG_SND_DMA_SGBUF
81 /*
82 * Scatter-Gather generic device pages
83 */
84 void *snd_malloc_sgbuf_pages(struct device *device,
85 size_t size, struct snd_dma_buffer *dmab,
86 size_t *res_size);
87 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
88
89 struct snd_sg_page {
90 void *buf;
91 dma_addr_t addr;
92 };
93
94 struct snd_sg_buf {
95 int size; /* allocated byte size */
96 int pages; /* allocated pages */
97 int tblsize; /* allocated table size */
98 struct snd_sg_page *table; /* address table */
99 struct page **page_table; /* page table (for vmap/vunmap) */
100 struct device *dev;
101 };
102
103 /*
104 * return the physical address at the corresponding offset
105 */
snd_sgbuf_get_addr(struct snd_dma_buffer * dmab,size_t offset)106 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
107 size_t offset)
108 {
109 struct snd_sg_buf *sgbuf = dmab->private_data;
110 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
111 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
112 return addr + offset % PAGE_SIZE;
113 }
114
115 /*
116 * return the virtual address at the corresponding offset
117 */
snd_sgbuf_get_ptr(struct snd_dma_buffer * dmab,size_t offset)118 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
119 size_t offset)
120 {
121 struct snd_sg_buf *sgbuf = dmab->private_data;
122 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
123 }
124
125 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
126 unsigned int ofs, unsigned int size);
127 #else
128 /* non-SG versions */
snd_sgbuf_get_addr(struct snd_dma_buffer * dmab,size_t offset)129 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
130 size_t offset)
131 {
132 return dmab->addr + offset;
133 }
134
snd_sgbuf_get_ptr(struct snd_dma_buffer * dmab,size_t offset)135 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
136 size_t offset)
137 {
138 return dmab->area + offset;
139 }
140
141 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
142
143 #endif /* CONFIG_SND_DMA_SGBUF */
144
145 /* allocate/release a buffer */
146 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
147 struct snd_dma_buffer *dmab);
148 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
149 struct snd_dma_buffer *dmab);
150 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
151
152 /* basic memory allocation functions */
153 void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
154 void snd_free_pages(void *ptr, size_t size);
155
156 #endif /* __SOUND_MEMALLOC_H */
157
158