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 #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  */
  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 */
  70 };
  71
  72 #ifdef CONFIG_SND_DMA_SGBUF
  73 /*
  74  * Scatter-Gather generic device pages
  75  */
  76 void *snd_malloc_sgbuf_pages(struct device *device,
  77                              size_t size, struct snd_dma_buffer *dmab,
  78                              size_t *res_size);
  79 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
  80
  81 struct snd_sg_page {
  82         void *buf;
  83         dma_addr_t addr;
  84 };
  85
  86 struct 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  */
  98 static 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  */
 106 static 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  */
 118 static 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
 125 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
 126                                       unsigned int ofs, unsigned int size);
 127 #else
 128 /* non-SG versions */
 129 static 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
 135 static 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 */
 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);
 151
 152 /* basic memory allocation functions */
 153 void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
 154 void snd_free_pages(void *ptr, size_t size);
 155
 156 #endif /* __SOUND_MEMALLOC_H */
 157