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