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_isa_data() NULL 41 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x)) 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 #define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */ 51 #ifdef CONFIG_SND_DMA_SGBUF 52 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ 53 #define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */ 54 #else 55 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ 56 #define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC 57 #endif 58 #ifdef CONFIG_GENERIC_ALLOCATOR 59 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ 60 #else 61 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV 62 #endif 63 64 /* 65 * info for buffer allocation 66 */ 67 struct snd_dma_buffer { 68 struct snd_dma_device dev; /* device type */ 69 unsigned char *area; /* virtual pointer */ 70 dma_addr_t addr; /* physical address */ 71 size_t bytes; /* buffer size in bytes */ 72 void *private_data; /* private for allocator; don't touch */ 73 }; 74 75 /* 76 * return the pages matching with the given byte size 77 */ 78 static inline unsigned int snd_sgbuf_aligned_pages(size_t size) 79 { 80 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 81 } 82 83 #ifdef CONFIG_SND_DMA_SGBUF 84 /* 85 * Scatter-Gather generic device pages 86 */ 87 void *snd_malloc_sgbuf_pages(struct device *device, 88 size_t size, struct snd_dma_buffer *dmab, 89 size_t *res_size); 90 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); 91 92 struct snd_sg_page { 93 void *buf; 94 dma_addr_t addr; 95 }; 96 97 struct snd_sg_buf { 98 int size; /* allocated byte size */ 99 int pages; /* allocated pages */ 100 int tblsize; /* allocated table size */ 101 struct snd_sg_page *table; /* address table */ 102 struct page **page_table; /* page table (for vmap/vunmap) */ 103 struct device *dev; 104 }; 105 106 /* 107 * return the physical address at the corresponding offset 108 */ 109 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 110 size_t offset) 111 { 112 struct snd_sg_buf *sgbuf = dmab->private_data; 113 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; 114 addr &= ~((dma_addr_t)PAGE_SIZE - 1); 115 return addr + offset % PAGE_SIZE; 116 } 117 118 /* 119 * return the virtual address at the corresponding offset 120 */ 121 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 122 size_t offset) 123 { 124 struct snd_sg_buf *sgbuf = dmab->private_data; 125 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; 126 } 127 128 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 129 unsigned int ofs, unsigned int size); 130 #else 131 /* non-SG versions */ 132 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 133 size_t offset) 134 { 135 return dmab->addr + offset; 136 } 137 138 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 139 size_t offset) 140 { 141 return dmab->area + offset; 142 } 143 144 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size) 145 146 #endif /* CONFIG_SND_DMA_SGBUF */ 147 148 /* allocate/release a buffer */ 149 int snd_dma_alloc_pages(int type, struct device *dev, size_t size, 150 struct snd_dma_buffer *dmab); 151 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 152 struct snd_dma_buffer *dmab); 153 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 154 155 /* basic memory allocation functions */ 156 void *snd_malloc_pages(size_t size, gfp_t gfp_flags); 157 void snd_free_pages(void *ptr, size_t size); 158 159 #endif /* __SOUND_MEMALLOC_H */ 160 161