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 */ 155 156