[linux-block.git] / include / sound / memalloc.h

/*
 *  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 */
};

#define snd_dma_pci_data(pci)	(&(pci)->dev)
#define snd_dma_isa_data()	NULL
#define snd_dma_continuous_data(x)	((struct device *)(__force unsigned long)(x))


/*
 * 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 */
#ifdef CONFIG_SND_DMA_SGBUF
#define SNDRV_DMA_TYPE_DEV_SG		3	/* generic device SG-buffer */
#else
#define SNDRV_DMA_TYPE_DEV_SG	SNDRV_DMA_TYPE_DEV /* no SG-buf support */
#endif
#ifdef CONFIG_GENERIC_ALLOCATOR
#define SNDRV_DMA_TYPE_DEV_IRAM		4	/* generic device iram-buffer */
#else
#define SNDRV_DMA_TYPE_DEV_IRAM	SNDRV_DMA_TYPE_DEV
#endif

/*
 * 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 */
};

#ifdef CONFIG_SND_DMA_SGBUF
/*
 * 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_dma_buffer *dmab,
					   size_t offset)
{
	struct snd_sg_buf *sgbuf = dmab->private_data;
	dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
	addr &= ~((dma_addr_t)PAGE_SIZE - 1);
	return addr + offset % PAGE_SIZE;
}

/*
 * return the virtual address at the corresponding offset
 */
static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
				     size_t offset)
{
	struct snd_sg_buf *sgbuf = dmab->private_data;
	return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
}

unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
				      unsigned int ofs, unsigned int size);
#else
/* non-SG versions */
static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
					    size_t offset)
{
	return dmab->addr + offset;
}

static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
				      size_t offset)
{
	return dmab->area + offset;
}

#define snd_sgbuf_get_chunk_size(dmab, ofs, size)	(size)

#endif /* CONFIG_SND_DMA_SGBUF */

/* 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);

/* 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 */
Commit	Line	Data
1da177e4	1	/*
c1017a4c	2	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	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	struct device;
	28
	29	/*
	30	* buffer device info
	31	*/
	32	struct snd_dma_device {
	33	int type; /* SNDRV_DMA_TYPE_XXX */
	34	struct device dev; / generic device */
	35	};
	36
1da177e4 LT	37	#define snd_dma_pci_data(pci) (&(pci)->dev)
1da177e4 LT	38	#define snd_dma_isa_data() NULL
019d80db	39	#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
1da177e4 LT	40
	41
	42	/*
	43	* buffer types
	44	*/
	45	#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
	46	#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
	47	#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
cc6a8acd	48	#ifdef CONFIG_SND_DMA_SGBUF
1da177e4	49	#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
cc6a8acd TI	50	#else
	51	#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
	52	#endif
a5606f85	53	#ifdef CONFIG_GENERIC_ALLOCATOR
05503214	54	#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
a5606f85 TI	55	#else
	56	#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
	57	#endif
1da177e4 LT	58
	59	/*
	60	* info for buffer allocation
	61	*/
	62	struct snd_dma_buffer {
	63	struct snd_dma_device dev; /* device type */
	64	unsigned char area; / virtual pointer */
	65	dma_addr_t addr; /* physical address */
	66	size_t bytes; /* buffer size in bytes */
	67	void private_data; / private for allocator; don't touch */
	68	};
	69
cc6a8acd	70	#ifdef CONFIG_SND_DMA_SGBUF
1da177e4 LT	71	/*
	72	* Scatter-Gather generic device pages
	73	*/
77a23f26 TI	74	void snd_malloc_sgbuf_pages(struct device device,
	75	size_t size, struct snd_dma_buffer *dmab,
	76	size_t *res_size);
	77	int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
	78
1da177e4 LT	79	struct snd_sg_page {
	80	void *buf;
	81	dma_addr_t addr;
	82	};
	83
	84	struct snd_sg_buf {
	85	int size; /* allocated byte size */
	86	int pages; /* allocated pages */
	87	int tblsize; /* allocated table size */
	88	struct snd_sg_page table; / address table */
	89	struct page *page_table; / page table (for vmap/vunmap) */
	90	struct device *dev;
	91	};
	92
	93	/*
	94	* return the pages matching with the given byte size
	95	*/
	96	static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
	97	{
	98	return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
	99	}
	100
	101	/*
	102	* return the physical address at the corresponding offset
	103	*/
9d069dc0 TI	104	static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
9d069dc0 TI	105	size_t offset)
1da177e4	106	{
9d069dc0	107	struct snd_sg_buf *sgbuf = dmab->private_data;
51e9f2e6	108	dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
932e9dec	109	addr &= ~((dma_addr_t)PAGE_SIZE - 1);
51e9f2e6	110	return addr + offset % PAGE_SIZE;
1da177e4 LT	111	}
1da177e4 LT	112
77a23f26 TI	113	/*
	114	* return the virtual address at the corresponding offset
	115	*/
9d069dc0 TI	116	static inline void snd_sgbuf_get_ptr(struct snd_dma_buffer dmab,
9d069dc0 TI	117	size_t offset)
77a23f26	118	{
9d069dc0	119	struct snd_sg_buf *sgbuf = dmab->private_data;
77a23f26 TI	120	return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
77a23f26 TI	121	}
9d069dc0 TI	122
	123	unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
	124	unsigned int ofs, unsigned int size);
	125	#else
	126	/* non-SG versions */
	127	static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
	128	size_t offset)
	129	{
	130	return dmab->addr + offset;
	131	}
	132
	133	static inline void snd_sgbuf_get_ptr(struct snd_dma_buffer dmab,
	134	size_t offset)
	135	{
	136	return dmab->area + offset;
	137	}
	138
	139	#define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
	140
cc6a8acd	141	#endif /* CONFIG_SND_DMA_SGBUF */
1da177e4 LT	142
	143	/* allocate/release a buffer */
	144	int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
	145	struct snd_dma_buffer *dmab);
	146	int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
	147	struct snd_dma_buffer *dmab);
	148	void snd_dma_free_pages(struct snd_dma_buffer *dmab);
	149
1da177e4	150	/* basic memory allocation functions */
1ef64e67	151	void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
1da177e4 LT	152	void snd_free_pages(void *ptr, size_t size);
	153
	154	#endif /* __SOUND_MEMALLOC_H */
	155