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 #ifdef CONFIG_GENERIC_ALLOCATOR
56 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
58 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
62 * info for buffer allocation
64 struct snd_dma_buffer {
65 struct snd_dma_device dev; /* device type */
66 unsigned char *area; /* virtual pointer */
67 dma_addr_t addr; /* physical address */
68 size_t bytes; /* buffer size in bytes */
69 void *private_data; /* private for allocator; don't touch */
72 #ifdef CONFIG_SND_DMA_SGBUF
74 * Scatter-Gather generic device pages
76 void *snd_malloc_sgbuf_pages(struct device *device,
77 size_t size, struct snd_dma_buffer *dmab,
79 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
87 int size; /* allocated byte size */
88 int pages; /* allocated pages */
89 int tblsize; /* allocated table size */
90 struct snd_sg_page *table; /* address table */
91 struct page **page_table; /* page table (for vmap/vunmap) */
96 * return the pages matching with the given byte size
98 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
100 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
104 * return the physical address at the corresponding offset
106 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
109 struct snd_sg_buf *sgbuf = dmab->private_data;
110 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
111 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
112 return addr + offset % PAGE_SIZE;
116 * return the virtual address at the corresponding offset
118 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
121 struct snd_sg_buf *sgbuf = dmab->private_data;
122 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
125 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
126 unsigned int ofs, unsigned int size);
128 /* non-SG versions */
129 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
132 return dmab->addr + offset;
135 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
138 return dmab->area + offset;
141 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
143 #endif /* CONFIG_SND_DMA_SGBUF */
145 /* allocate/release a buffer */
146 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
147 struct snd_dma_buffer *dmab);
148 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
149 struct snd_dma_buffer *dmab);
150 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
152 /* buffer-preservation managements */
154 #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
156 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
157 int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
159 /* basic memory allocation functions */
160 void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
161 void snd_free_pages(void *ptr, size_t size);
163 #endif /* __SOUND_MEMALLOC_H */