LXR linux/include/sound/memalloc.h

   1/*
   2 *  Copyright (c) by Jaroslav Kysela <perex@perex.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
  27struct device;
  28
  29/*
  30 * buffer device info
  31 */
  32struct 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_continuous_data(x)      ((struct device *)(__force unsigned long)(x))
  41#endif
  42
  43
  44/*
  45 * buffer types
  46 */
  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 */
  52#else
  53#define SNDRV_DMA_TYPE_DEV_SG   SNDRV_DMA_TYPE_DEV /* no SG-buf support */
  54#endif
  55#ifdef CONFIG_GENERIC_ALLOCATOR
  56#define SNDRV_DMA_TYPE_DEV_IRAM         4       /* generic device iram-buffer */
  57#else
  58#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
  59#endif
  60
  61/*
  62 * info for buffer allocation
  63 */
  64struct 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 */
  70};
  71
  72#ifdef CONFIG_SND_DMA_SGBUF
  73/*
  74 * Scatter-Gather generic device pages
  75 */
  76void *snd_malloc_sgbuf_pages(struct device *device,
  77                             size_t size, struct snd_dma_buffer *dmab,
  78                             size_t *res_size);
  79int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
  80
  81struct snd_sg_page {
  82        void *buf;
  83        dma_addr_t addr;
  84};
  85
  86struct snd_sg_buf {
  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) */
  92        struct device *dev;
  93};
  94
  95/*
  96 * return the pages matching with the given byte size
  97 */
  98static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
  99{
 100        return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 101}
 102
 103/*
 104 * return the physical address at the corresponding offset
 105 */
 106static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
 107                                           size_t offset)
 108{
 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;
 113}
 114
 115/*
 116 * return the virtual address at the corresponding offset
 117 */
 118static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
 119                                     size_t offset)
 120{
 121        struct snd_sg_buf *sgbuf = dmab->private_data;
 122        return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
 123}
 124
 125unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
 126                                      unsigned int ofs, unsigned int size);
 127#else
 128/* non-SG versions */
 129static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
 130                                            size_t offset)
 131{
 132        return dmab->addr + offset;
 133}
 134
 135static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
 136                                      size_t offset)
 137{
 138        return dmab->area + offset;
 139}
 140
 141#define snd_sgbuf_get_chunk_size(dmab, ofs, size)       (size)
 142
 143#endif /* CONFIG_SND_DMA_SGBUF */
 144
 145/* allocate/release a buffer */
 146int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
 147                        struct snd_dma_buffer *dmab);
 148int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
 149                                 struct snd_dma_buffer *dmab);
 150void snd_dma_free_pages(struct snd_dma_buffer *dmab);
 151
 152/* basic memory allocation functions */
 153void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
 154void snd_free_pages(void *ptr, size_t size);
 155
 156#endif /* __SOUND_MEMALLOC_H */
 157
 158