include/sound/memalloc.h

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