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 */ 118 119