Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 782d1df342082da5327c4c763a571482712b8f49 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *                   Takashi Iwai <tiwai@suse.de>
 * 
 *  Generic memory allocators
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#ifndef __SOUND_MEMALLOC_H
#define __SOUND_MEMALLOC_H

struct device;

/*
 * buffer device info
 */
struct snd_dma_device {
	int type;			/* SNDRV_DMA_TYPE_XXX */
	struct device *dev;		/* generic device */
};

#ifndef snd_dma_pci_data
#define snd_dma_pci_data(pci)	(&(pci)->dev)
#define snd_dma_isa_data()	NULL
#define snd_dma_continuous_data(x)	((struct device *)(__force unsigned long)(x))
#endif


/*
 * buffer types
 */
#define SNDRV_DMA_TYPE_UNKNOWN		0	/* not defined */
#define SNDRV_DMA_TYPE_CONTINUOUS	1	/* continuous no-DMA memory */
#define SNDRV_DMA_TYPE_DEV		2	/* generic device continuous */
#ifdef CONFIG_SND_DMA_SGBUF
#define SNDRV_DMA_TYPE_DEV_SG		3	/* generic device SG-buffer */
#else
#define SNDRV_DMA_TYPE_DEV_SG	SNDRV_DMA_TYPE_DEV /* no SG-buf support */
#endif
#ifdef CONFIG_GENERIC_ALLOCATOR
#define SNDRV_DMA_TYPE_DEV_IRAM		4	/* generic device iram-buffer */
#else
#define SNDRV_DMA_TYPE_DEV_IRAM	SNDRV_DMA_TYPE_DEV
#endif

/*
 * info for buffer allocation
 */
struct snd_dma_buffer {
	struct snd_dma_device dev;	/* device type */
	unsigned char *area;	/* virtual pointer */
	dma_addr_t addr;	/* physical address */
	size_t bytes;		/* buffer size in bytes */
	void *private_data;	/* private for allocator; don't touch */
};

#ifdef CONFIG_SND_DMA_SGBUF
/*
 * Scatter-Gather generic device pages
 */
void *snd_malloc_sgbuf_pages(struct device *device,
			     size_t size, struct snd_dma_buffer *dmab,
			     size_t *res_size);
int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);

struct snd_sg_page {
	void *buf;
	dma_addr_t addr;
};

struct snd_sg_buf {
	int size;	/* allocated byte size */
	int pages;	/* allocated pages */
	int tblsize;	/* allocated table size */
	struct snd_sg_page *table;	/* address table */
	struct page **page_table;	/* page table (for vmap/vunmap) */
	struct device *dev;
};

/*
 * return the pages matching with the given byte size
 */
static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
{
	return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
}

/*
 * return the physical address at the corresponding offset
 */
static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
					   size_t offset)
{
	struct snd_sg_buf *sgbuf = dmab->private_data;
	dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
	addr &= ~((dma_addr_t)PAGE_SIZE - 1);
	return addr + offset % PAGE_SIZE;
}

/*
 * return the virtual address at the corresponding offset
 */
static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
				     size_t offset)
{
	struct snd_sg_buf *sgbuf = dmab->private_data;
	return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
}

unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
				      unsigned int ofs, unsigned int size);
#else
/* non-SG versions */
static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
					    size_t offset)
{
	return dmab->addr + offset;
}

static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
				      size_t offset)
{
	return dmab->area + offset;
}

#define snd_sgbuf_get_chunk_size(dmab, ofs, size)	(size)

#endif /* CONFIG_SND_DMA_SGBUF */

/* allocate/release a buffer */
int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
			struct snd_dma_buffer *dmab);
int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
                                 struct snd_dma_buffer *dmab);
void snd_dma_free_pages(struct snd_dma_buffer *dmab);

/* basic memory allocation functions */
void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
void snd_free_pages(void *ptr, size_t size);

#endif /* __SOUND_MEMALLOC_H */