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
16 /*
17 * buffer device info
18 */
19 struct snd_dma_device {
20 int type; /* SNDRV_DMA_TYPE_XXX */
21 struct device *dev; /* generic device */
22 };
23
24 #define snd_dma_pci_data(pci) (&(pci)->dev)
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_UC 5 /* continuous non-cahced */
35 #ifdef CONFIG_SND_DMA_SGBUF
36 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
37 #define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
38 #else
39 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
40 #define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
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
48 /*
49 * info for buffer allocation
50 */
51 struct snd_dma_buffer {
52 struct snd_dma_device dev; /* device type */
53 unsigned char *area; /* virtual pointer */
54 dma_addr_t addr; /* physical address */
55 size_t bytes; /* buffer size in bytes */
56 void *private_data; /* private for allocator; don't touch */
57 };
58
59 /*
60 * return the pages matching with the given byte size
61 */
snd_sgbuf_aligned_pages(size_t size)62 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
63 {
64 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
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 physical address at the corresponding offset
92 */
snd_sgbuf_get_addr(struct snd_dma_buffer * dmab,size_t offset)93 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
94 size_t offset)
95 {
96 struct snd_sg_buf *sgbuf = dmab->private_data;
97 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
98 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
99 return addr + offset % PAGE_SIZE;
100 }
101
102 /*
103 * return the virtual address at the corresponding offset
104 */
snd_sgbuf_get_ptr(struct snd_dma_buffer * dmab,size_t offset)105 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
106 size_t offset)
107 {
108 struct snd_sg_buf *sgbuf = dmab->private_data;
109 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
110 }
111
112 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
113 unsigned int ofs, unsigned int size);
114 #else
115 /* non-SG versions */
snd_sgbuf_get_addr(struct snd_dma_buffer * dmab,size_t offset)116 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
117 size_t offset)
118 {
119 return dmab->addr + offset;
120 }
121
snd_sgbuf_get_ptr(struct snd_dma_buffer * dmab,size_t offset)122 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
123 size_t offset)
124 {
125 return dmab->area + offset;
126 }
127
128 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
129
130 #endif /* CONFIG_SND_DMA_SGBUF */
131
132 /* allocate/release a buffer */
133 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
134 struct snd_dma_buffer *dmab);
135 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
136 struct snd_dma_buffer *dmab);
137 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
138
139 #endif /* __SOUND_MEMALLOC_H */
140
141
