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
  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 #define snd_dma_pci_data(pci)   (&(pci)->dev)
  38 #define snd_dma_isa_data()      NULL
  39 #define snd_dma_continuous_data(x)      ((struct device *)(__force unsigned long)(x))
  40
  41
  42 /*
  43  * buffer types
  44  */
  45 #define SNDRV_DMA_TYPE_UNKNOWN          0       /* not defined */
  46 #define SNDRV_DMA_TYPE_CONTINUOUS       1       /* continuous no-DMA memory */
  47 #define SNDRV_DMA_TYPE_DEV              2       /* generic device continuous */
  48 #ifdef CONFIG_SND_DMA_SGBUF
  49 #define SNDRV_DMA_TYPE_DEV_SG           3       /* generic device SG-buffer */
  50 #else
  51 #define SNDRV_DMA_TYPE_DEV_SG   SNDRV_DMA_TYPE_DEV /* no SG-buf support */
  52 #endif
  53 #ifdef CONFIG_GENERIC_ALLOCATOR
  54 #define SNDRV_DMA_TYPE_DEV_IRAM         4       /* generic device iram-buffer */
  55 #else
  56 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
  57 #endif
  58
  59 /*
  60  * info for buffer allocation
  61  */
  62 struct snd_dma_buffer {
  63         struct snd_dma_device dev;      /* device type */
  64         unsigned char *area;    /* virtual pointer */
  65         dma_addr_t addr;        /* physical address */
  66         size_t bytes;           /* buffer size in bytes */
  67         void *private_data;     /* private for allocator; don't touch */
  68 };
  69
  70 #ifdef CONFIG_SND_DMA_SGBUF
  71 /*
  72  * Scatter-Gather generic device pages
  73  */
  74 void *snd_malloc_sgbuf_pages(struct device *device,
  75                              size_t size, struct snd_dma_buffer *dmab,
  76                              size_t *res_size);
  77 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
  78
  79 struct snd_sg_page {
  80         void *buf;
  81         dma_addr_t addr;
  82 };
  83
  84 struct snd_sg_buf {
  85         int size;       /* allocated byte size */
  86         int pages;      /* allocated pages */
  87         int tblsize;    /* allocated table size */
  88         struct snd_sg_page *table;      /* address table */
  89         struct page **page_table;       /* page table (for vmap/vunmap) */
  90         struct device *dev;
  91 };
  92
  93 /*
  94  * return the pages matching with the given byte size
  95  */
  96 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
  97 {
  98         return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
  99 }
 100
 101 /*
 102  * return the physical address at the corresponding offset
 103  */
 104 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
 105                                            size_t offset)
 106 {
 107         struct snd_sg_buf *sgbuf = dmab->private_data;
 108         dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
 109         addr &= ~((dma_addr_t)PAGE_SIZE - 1);
 110         return addr + offset % PAGE_SIZE;
 111 }
 112
 113 /*
 114  * return the virtual address at the corresponding offset
 115  */
 116 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
 117                                      size_t offset)
 118 {
 119         struct snd_sg_buf *sgbuf = dmab->private_data;
 120         return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
 121 }
 122
 123 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
 124                                       unsigned int ofs, unsigned int size);
 125 #else
 126 /* non-SG versions */
 127 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
 128                                             size_t offset)
 129 {
 130         return dmab->addr + offset;
 131 }
 132
 133 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
 134                                       size_t offset)
 135 {
 136         return dmab->area + offset;
 137 }
 138
 139 #define snd_sgbuf_get_chunk_size(dmab, ofs, size)       (size)
 140
 141 #endif /* CONFIG_SND_DMA_SGBUF */
 142
 143 /* allocate/release a buffer */
 144 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
 145                         struct snd_dma_buffer *dmab);
 146 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
 147                                  struct snd_dma_buffer *dmab);
 148 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
 149
 150 /* basic memory allocation functions */
 151 void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
 152 void snd_free_pages(void *ptr, size_t size);
 153
 154 #endif /* __SOUND_MEMALLOC_H */
 155