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157 lines
4.4 KiB
157 lines
4.4 KiB
/* |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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* Takashi Iwai <[email protected]> |
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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_continuous_data(x) ((struct device *)(__force 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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#ifdef CONFIG_SND_DMA_SGBUF |
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#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ |
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#else |
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#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ |
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#endif |
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#ifdef CONFIG_GENERIC_ALLOCATOR |
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#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ |
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#else |
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#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV |
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#endif |
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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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#ifdef CONFIG_SND_DMA_SGBUF |
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/* |
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* Scatter-Gather generic device pages |
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*/ |
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void *snd_malloc_sgbuf_pages(struct device *device, |
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size_t size, struct snd_dma_buffer *dmab, |
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size_t *res_size); |
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int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); |
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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_dma_buffer *dmab, |
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size_t offset) |
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{ |
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struct snd_sg_buf *sgbuf = dmab->private_data; |
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dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; |
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addr &= ~((dma_addr_t)PAGE_SIZE - 1); |
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return addr + offset % PAGE_SIZE; |
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} |
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/* |
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* return the virtual address at the corresponding offset |
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*/ |
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static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, |
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size_t offset) |
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{ |
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struct snd_sg_buf *sgbuf = dmab->private_data; |
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return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; |
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} |
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unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, |
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unsigned int ofs, unsigned int size); |
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#else |
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/* non-SG versions */ |
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static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, |
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size_t offset) |
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{ |
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return dmab->addr + offset; |
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} |
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static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, |
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size_t offset) |
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{ |
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return dmab->area + offset; |
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} |
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#define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size) |
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#endif /* CONFIG_SND_DMA_SGBUF */ |
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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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/* 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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