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