| /* |
| * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| * Takashi Iwai <tiwai@suse.de> |
| * |
| * Generic memory allocators |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #ifndef __SOUND_MEMALLOC_H |
| #define __SOUND_MEMALLOC_H |
| |
| struct device; |
| |
| /* |
| * buffer device info |
| */ |
| struct snd_dma_device { |
| int type; /* SNDRV_DMA_TYPE_XXX */ |
| struct device *dev; /* generic device */ |
| }; |
| |
| #ifndef snd_dma_pci_data |
| #define snd_dma_pci_data(pci) (&(pci)->dev) |
| #define snd_dma_isa_data() NULL |
| #define snd_dma_sbus_data(sbus) ((struct device *)(sbus)) |
| #define snd_dma_continuous_data(x) ((struct device *)(unsigned long)(x)) |
| #endif |
| |
| |
| /* |
| * buffer types |
| */ |
| #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */ |
| #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */ |
| #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */ |
| #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ |
| #define SNDRV_DMA_TYPE_SBUS 4 /* SBUS continuous */ |
| |
| /* |
| * info for buffer allocation |
| */ |
| struct snd_dma_buffer { |
| struct snd_dma_device dev; /* device type */ |
| unsigned char *area; /* virtual pointer */ |
| dma_addr_t addr; /* physical address */ |
| size_t bytes; /* buffer size in bytes */ |
| void *private_data; /* private for allocator; don't touch */ |
| }; |
| |
| /* |
| * Scatter-Gather generic device pages |
| */ |
| void *snd_malloc_sgbuf_pages(struct device *device, |
| size_t size, struct snd_dma_buffer *dmab, |
| size_t *res_size); |
| int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); |
| |
| struct snd_sg_page { |
| void *buf; |
| dma_addr_t addr; |
| }; |
| |
| struct snd_sg_buf { |
| int size; /* allocated byte size */ |
| int pages; /* allocated pages */ |
| int tblsize; /* allocated table size */ |
| struct snd_sg_page *table; /* address table */ |
| struct page **page_table; /* page table (for vmap/vunmap) */ |
| struct device *dev; |
| }; |
| |
| /* |
| * return the pages matching with the given byte size |
| */ |
| static inline unsigned int snd_sgbuf_aligned_pages(size_t size) |
| { |
| return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| } |
| |
| /* |
| * return the physical address at the corresponding offset |
| */ |
| static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset) |
| { |
| dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; |
| addr &= PAGE_MASK; |
| return addr + offset % PAGE_SIZE; |
| } |
| |
| /* |
| * return the virtual address at the corresponding offset |
| */ |
| static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset) |
| { |
| return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; |
| } |
| |
| /* allocate/release a buffer */ |
| int snd_dma_alloc_pages(int type, struct device *dev, size_t size, |
| struct snd_dma_buffer *dmab); |
| int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, |
| struct snd_dma_buffer *dmab); |
| void snd_dma_free_pages(struct snd_dma_buffer *dmab); |
| |
| /* buffer-preservation managements */ |
| |
| #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device) |
| |
| size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id); |
| int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id); |
| |
| /* basic memory allocation functions */ |
| void *snd_malloc_pages(size_t size, gfp_t gfp_flags); |
| void snd_free_pages(void *ptr, size_t size); |
| |
| #endif /* __SOUND_MEMALLOC_H */ |
| |