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 #include <asm/page.h> 28 29 struct device; 30 31 /* 32 * buffer device info 33 */ 34 struct snd_dma_device { 35 int type; /* SNDRV_DMA_TYPE_XXX */ 36 struct device *dev; /* generic device */ 37 }; 38 39 #define snd_dma_pci_data(pci) (&(pci)->dev) 40 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x)) 41 42 43 /* 44 * buffer types 45 */ 46 #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */ 47 #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */ 48 #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */ 49 #define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */ 50 #ifdef CONFIG_SND_DMA_SGBUF 51 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ 52 #define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */ 53 #else 54 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ 55 #define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC 56 #endif 57 #ifdef CONFIG_GENERIC_ALLOCATOR 58 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ 59 #else 60 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV 61 #endif 62 63 /* 64 * info for buffer allocation 65 */ 66 struct snd_dma_buffer { 67 struct snd_dma_device dev; /* device type */ 68 unsigned char *area; /* virtual pointer */ 69 dma_addr_t addr; /* physical address */ 70 size_t bytes; /* buffer size in bytes */ 71 void *private_data; /* private for allocator; don't touch */ 72 }; 73 74 /* 75 * return the pages matching with the given byte size 76 */ 77 static inline unsigned int snd_sgbuf_aligned_pages(size_t size) 78 { 79 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 80 } 81 82 #ifdef CONFIG_SND_DMA_SGBUF 83 /* 84 * Scatter-Gather generic device pages 85 */ 86 void *snd_malloc_sgbuf_pages(struct device *device, 87 size_t size, struct snd_dma_buffer *dmab, 88 size_t *res_size); 89 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); 90 91 struct snd_sg_page { 92 void *buf; 93 dma_addr_t addr; 94 }; 95 96 struct snd_sg_buf { 97 int size; /* allocated byte size */ 98 int pages; /* allocated pages */ 99 int tblsize; /* allocated table size */ 100 struct snd_sg_page *table; /* address table */ 101 struct page **page_table; /* page table (for vmap/vunmap) */ 102 struct device *dev; 103 }; 104 105 /* 106 * return the physical address at the corresponding offset 107 */ 108 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 109 size_t offset) 110 { 111 struct snd_sg_buf *sgbuf = dmab->private_data; 112 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; 113 addr &= ~((dma_addr_t)PAGE_SIZE - 1); 114 return addr + offset % PAGE_SIZE; 115 } 116 117 /* 118 * return the virtual address at the corresponding offset 119 */ 120 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 121 size_t offset) 122 { 123 struct snd_sg_buf *sgbuf = dmab->private_data; 124 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; 125 } 126 127 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 128 unsigned int ofs, unsigned int size); 129 #else 130 /* non-SG versions */ 131 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 132 size_t offset) 133 { 134 return dmab->addr + offset; 135 } 136 137 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 138 size_t offset) 139 { 140 return dmab->area + offset; 141 } 142 143 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size) 144 145 #endif /* CONFIG_SND_DMA_SGBUF */ 146 147 /* allocate/release a buffer */ 148 int snd_dma_alloc_pages(int type, struct device *dev, size_t size, 149 struct snd_dma_buffer *dmab); 150 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 151 struct snd_dma_buffer *dmab); 152 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 153 154 /* basic memory allocation functions */ 155 void *snd_malloc_pages(size_t size, gfp_t gfp_flags); 156 void snd_free_pages(void *ptr, size_t size); 157 158 #endif /* __SOUND_MEMALLOC_H */ 159 160