2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Takashi Iwai <tiwai@suse.de>
5 * Generic memory allocators
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.
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.
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
24 #ifndef __SOUND_MEMALLOC_H
25 #define __SOUND_MEMALLOC_H
32 struct snd_dma_device {
33 int type; /* SNDRV_DMA_TYPE_XXX */
34 struct device *dev; /* generic device */
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_continuous_data(x) ((struct device *)(__force unsigned long)(x))
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 */
53 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
55 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
58 * info for buffer allocation
60 struct snd_dma_buffer {
61 struct snd_dma_device dev; /* device type */
62 unsigned char *area; /* virtual pointer */
63 dma_addr_t addr; /* physical address */
64 size_t bytes; /* buffer size in bytes */
65 void *private_data; /* private for allocator; don't touch */
68 #ifdef CONFIG_SND_DMA_SGBUF
70 * Scatter-Gather generic device pages
72 void *snd_malloc_sgbuf_pages(struct device *device,
73 size_t size, struct snd_dma_buffer *dmab,
75 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
83 int size; /* allocated byte size */
84 int pages; /* allocated pages */
85 int tblsize; /* allocated table size */
86 struct snd_sg_page *table; /* address table */
87 struct page **page_table; /* page table (for vmap/vunmap) */
92 * return the pages matching with the given byte size
94 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
96 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
100 * return the physical address at the corresponding offset
102 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
105 struct snd_sg_buf *sgbuf = dmab->private_data;
106 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
108 return addr + offset % PAGE_SIZE;
112 * return the virtual address at the corresponding offset
114 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
117 struct snd_sg_buf *sgbuf = dmab->private_data;
118 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
121 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
122 unsigned int ofs, unsigned int size);
124 /* non-SG versions */
125 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
128 return dmab->addr + offset;
131 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
134 return dmab->area + offset;
137 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
139 #endif /* CONFIG_SND_DMA_SGBUF */
141 /* allocate/release a buffer */
142 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
143 struct snd_dma_buffer *dmab);
144 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
145 struct snd_dma_buffer *dmab);
146 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
148 /* buffer-preservation managements */
150 #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
152 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
153 int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
155 /* basic memory allocation functions */
156 void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
157 void snd_free_pages(void *ptr, size_t size);
159 #endif /* __SOUND_MEMALLOC_H */