Merge branch 'akpm' (patches from Andrew)
[linux-2.6-microblaze.git] / include / sound / memalloc.h
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *                   Takashi Iwai <tiwai@suse.de>
5  * 
6  *  Generic memory allocators
7  */
8
9 #ifndef __SOUND_MEMALLOC_H
10 #define __SOUND_MEMALLOC_H
11
12 #include <asm/page.h>
13
14 struct device;
15 struct vm_area_struct;
16
17 /*
18  * buffer device info
19  */
20 struct snd_dma_device {
21         int type;                       /* SNDRV_DMA_TYPE_XXX */
22         struct device *dev;             /* generic device */
23 };
24
25 #define snd_dma_continuous_data(x)      ((struct device *)(__force unsigned long)(x))
26
27
28 /*
29  * buffer types
30  */
31 #define SNDRV_DMA_TYPE_UNKNOWN          0       /* not defined */
32 #define SNDRV_DMA_TYPE_CONTINUOUS       1       /* continuous no-DMA memory */
33 #define SNDRV_DMA_TYPE_DEV              2       /* generic device continuous */
34 #define SNDRV_DMA_TYPE_DEV_WC           5       /* continuous write-combined */
35 #ifdef CONFIG_SND_DMA_SGBUF
36 #define SNDRV_DMA_TYPE_DEV_SG           3       /* generic device SG-buffer */
37 #define SNDRV_DMA_TYPE_DEV_WC_SG        6       /* SG write-combined */
38 #else
39 #define SNDRV_DMA_TYPE_DEV_SG   SNDRV_DMA_TYPE_DEV /* no SG-buf support */
40 #define SNDRV_DMA_TYPE_DEV_WC_SG        SNDRV_DMA_TYPE_DEV_WC
41 #endif
42 #ifdef CONFIG_GENERIC_ALLOCATOR
43 #define SNDRV_DMA_TYPE_DEV_IRAM         4       /* generic device iram-buffer */
44 #else
45 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
46 #endif
47 #define SNDRV_DMA_TYPE_VMALLOC          7       /* vmalloc'ed buffer */
48
49 /*
50  * info for buffer allocation
51  */
52 struct snd_dma_buffer {
53         struct snd_dma_device dev;      /* device type */
54         unsigned char *area;    /* virtual pointer */
55         dma_addr_t addr;        /* physical address */
56         size_t bytes;           /* buffer size in bytes */
57         void *private_data;     /* private for allocator; don't touch */
58 };
59
60 /*
61  * return the pages matching with the given byte size
62  */
63 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
64 {
65         return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
66 }
67
68 /* allocate/release a buffer */
69 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
70                         struct snd_dma_buffer *dmab);
71 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
72                                  struct snd_dma_buffer *dmab);
73 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
74 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
75                         struct vm_area_struct *area);
76
77 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
78 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
79 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
80                                       unsigned int ofs, unsigned int size);
81
82 /* device-managed memory allocator */
83 struct snd_dma_buffer *snd_devm_alloc_pages(struct device *dev, int type,
84                                             size_t size);
85
86 #endif /* __SOUND_MEMALLOC_H */
87