1/*
2 *  Copyright (c) by Jaroslav Kysela <perex@suse.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
27struct device;
28
29/*
30 * buffer device info
31 */
32struct 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 */
57struct 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 */
68struct snd_sg_page {
69	void *buf;
70	dma_addr_t addr;
71};
72
73struct 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 */
85static 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 */
93static 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 */
100int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
101			struct snd_dma_buffer *dmab);
102int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
103                                 struct snd_dma_buffer *dmab);
104void 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
110size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
111int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
112
113/* basic memory allocation functions */
114void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
115void snd_free_pages(void *ptr, size_t size);
116
117#endif /* __SOUND_MEMALLOC_H */
118