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_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 void *snd_malloc_sgbuf_pages(struct device *device, 69 size_t size, struct snd_dma_buffer *dmab, 70 size_t *res_size); 71 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); 72 73 struct snd_sg_page { 74 void *buf; 75 dma_addr_t addr; 76 }; 77 78 struct snd_sg_buf { 79 int size; /* allocated byte size */ 80 int pages; /* allocated pages */ 81 int tblsize; /* allocated table size */ 82 struct snd_sg_page *table; /* address table */ 83 struct page **page_table; /* page table (for vmap/vunmap) */ 84 struct device *dev; 85 }; 86 87 /* 88 * return the pages matching with the given byte size 89 */ 90 static inline unsigned int snd_sgbuf_aligned_pages(size_t size) 91 { 92 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 93 } 94 95 /* 96 * return the physical address at the corresponding offset 97 */ 98 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset) 99 { 100 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; 101 addr &= PAGE_MASK; 102 return addr + offset % PAGE_SIZE; 103 } 104 105 /* 106 * return the virtual address at the corresponding offset 107 */ 108 static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset) 109 { 110 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; 111 } 112 113 /* allocate/release a buffer */ 114 int snd_dma_alloc_pages(int type, struct device *dev, size_t size, 115 struct snd_dma_buffer *dmab); 116 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 117 struct snd_dma_buffer *dmab); 118 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 119 120 /* buffer-preservation managements */ 121 122 #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device) 123 124 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id); 125 int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id); 126 127 /* basic memory allocation functions */ 128 void *snd_malloc_pages(size_t size, gfp_t gfp_flags); 129 void snd_free_pages(void *ptr, size_t size); 130 131 #endif /* __SOUND_MEMALLOC_H */ 132 133