[net-next-2.6.git] / sound / pci / trident / trident_memory.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *  Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
 *
 *  Trident 4DWave-NX memory page allocation (TLB area)
 *  Trident chip can handle only 16MByte of the memory at the same time.
 *
 *
 *   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
 *
 */

#include <asm/io.h>
#include <linux/pci.h>
#include <linux/time.h>
#include <linux/mutex.h>

#include <sound/core.h>
#include <sound/trident.h>

/* page arguments of these two macros are Trident page (4096 bytes), not like
 * aligned pages in others
 */
#define __set_tlb_bus(trident,page,ptr,addr) \
	do { (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)); \
	     (trident)->tlb.shadow_entries[page] = (ptr); } while (0)
#define __tlb_to_ptr(trident,page) \
	(void*)((trident)->tlb.shadow_entries[page])
#define __tlb_to_addr(trident,page) \
	(dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))

#if PAGE_SIZE == 4096
/* page size == SNDRV_TRIDENT_PAGE_SIZE */
#define ALIGN_PAGE_SIZE		PAGE_SIZE	/* minimum page size for allocation */
#define MAX_ALIGN_PAGES		SNDRV_TRIDENT_MAX_PAGES	/* maxmium aligned pages */
/* fill TLB entrie(s) corresponding to page with ptr */
#define set_tlb_bus(trident,page,ptr,addr) __set_tlb_bus(trident,page,ptr,addr)
/* fill TLB entrie(s) corresponding to page with silence pointer */
#define set_silent_tlb(trident,page)	__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr)
/* get aligned page from offset address */
#define get_aligned_page(offset)	((offset) >> 12)
/* get offset address from aligned page */
#define aligned_page_offset(page)	((page) << 12)
/* get buffer address from aligned page */
#define page_to_ptr(trident,page)	__tlb_to_ptr(trident, page)
/* get PCI physical address from aligned page */
#define page_to_addr(trident,page)	__tlb_to_addr(trident, page)

#elif PAGE_SIZE == 8192
/* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
#define ALIGN_PAGE_SIZE		PAGE_SIZE
#define MAX_ALIGN_PAGES		(SNDRV_TRIDENT_MAX_PAGES / 2)
#define get_aligned_page(offset)	((offset) >> 13)
#define aligned_page_offset(page)	((page) << 13)
#define page_to_ptr(trident,page)	__tlb_to_ptr(trident, (page) << 1)
#define page_to_addr(trident,page)	__tlb_to_addr(trident, (page) << 1)

/* fill TLB entries -- we need to fill two entries */
static inline void set_tlb_bus(struct snd_trident *trident, int page,
			       unsigned long ptr, dma_addr_t addr)
{
	page <<= 1;
	__set_tlb_bus(trident, page, ptr, addr);
	__set_tlb_bus(trident, page+1, ptr + SNDRV_TRIDENT_PAGE_SIZE, addr + SNDRV_TRIDENT_PAGE_SIZE);
}
static inline void set_silent_tlb(struct snd_trident *trident, int page)
{
	page <<= 1;
	__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
	__set_tlb_bus(trident, page+1, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
}

#else
/* arbitrary size */
#define UNIT_PAGES		(PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
#define ALIGN_PAGE_SIZE		(SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
#define MAX_ALIGN_PAGES		(SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
/* Note: if alignment doesn't match to the maximum size, the last few blocks
 * become unusable.  To use such blocks, you'll need to check the validity
 * of accessing page in set_tlb_bus and set_silent_tlb.  search_empty()
 * should also check it, too.
 */
#define get_aligned_page(offset)	((offset) / ALIGN_PAGE_SIZE)
#define aligned_page_offset(page)	((page) * ALIGN_PAGE_SIZE)
#define page_to_ptr(trident,page)	__tlb_to_ptr(trident, (page) * UNIT_PAGES)
#define page_to_addr(trident,page)	__tlb_to_addr(trident, (page) * UNIT_PAGES)

/* fill TLB entries -- UNIT_PAGES entries must be filled */
static inline void set_tlb_bus(struct snd_trident *trident, int page,
			       unsigned long ptr, dma_addr_t addr)
{
	int i;
	page *= UNIT_PAGES;
	for (i = 0; i < UNIT_PAGES; i++, page++) {
		__set_tlb_bus(trident, page, ptr, addr);
		ptr += SNDRV_TRIDENT_PAGE_SIZE;
		addr += SNDRV_TRIDENT_PAGE_SIZE;
	}
}
static inline void set_silent_tlb(struct snd_trident *trident, int page)
{
	int i;
	page *= UNIT_PAGES;
	for (i = 0; i < UNIT_PAGES; i++, page++)
		__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
}

#endif /* PAGE_SIZE */

/* calculate buffer pointer from offset address */
static inline void *offset_ptr(struct snd_trident *trident, int offset)
{
	char *ptr;
	ptr = page_to_ptr(trident, get_aligned_page(offset));
	ptr += offset % ALIGN_PAGE_SIZE;
	return (void*)ptr;
}

/* first and last (aligned) pages of memory block */
#define firstpg(blk)	(((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
#define lastpg(blk)	(((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)

/*
 * search empty pages which may contain given size
 */
static struct snd_util_memblk *
search_empty(struct snd_util_memhdr *hdr, int size)
{
	struct snd_util_memblk *blk, *prev;
	int page, psize;
	struct list_head *p;

	psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
	prev = NULL;
	page = 0;
	list_for_each(p, &hdr->block) {
		blk = list_entry(p, struct snd_util_memblk, list);
		if (page + psize <= firstpg(blk))
			goto __found_pages;
		page = lastpg(blk) + 1;
	}
	if (page + psize > MAX_ALIGN_PAGES)
		return NULL;

__found_pages:
	/* create a new memory block */
	blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
	if (blk == NULL)
		return NULL;
	blk->offset = aligned_page_offset(page); /* set aligned offset */
	firstpg(blk) = page;
	lastpg(blk) = page + psize - 1;
	return blk;
}


/*
 * check if the given pointer is valid for pages
 */
static int is_valid_page(unsigned long ptr)
{
	if (ptr & ~0x3fffffffUL) {
		snd_printk(KERN_ERR "max memory size is 1GB!!\n");
		return 0;
	}
	if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
		snd_printk(KERN_ERR "page is not aligned\n");
		return 0;
	}
	return 1;
}

/*
 * page allocation for DMA (Scatter-Gather version)
 */
static struct snd_util_memblk *
snd_trident_alloc_sg_pages(struct snd_trident *trident,
			   struct snd_pcm_substream *substream)
{
	struct snd_util_memhdr *hdr;
	struct snd_util_memblk *blk;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int idx, page;

	if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
		       runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
					SNDRV_TRIDENT_PAGE_SIZE))
		return NULL;
	hdr = trident->tlb.memhdr;
	if (snd_BUG_ON(!hdr))
		return NULL;

	
	mutex_lock(&hdr->block_mutex);
	blk = search_empty(hdr, runtime->dma_bytes);
	if (blk == NULL) {
		mutex_unlock(&hdr->block_mutex);
		return NULL;
	}
			   
	/* set TLB entries */
	idx = 0;
	for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
		unsigned long ofs = idx << PAGE_SHIFT;
		dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
		unsigned long ptr = (unsigned long)
			snd_pcm_sgbuf_get_ptr(substream, ofs);
		if (! is_valid_page(addr)) {
			__snd_util_mem_free(hdr, blk);
			mutex_unlock(&hdr->block_mutex);
			return NULL;
		}
		set_tlb_bus(trident, page, ptr, addr);
	}
	mutex_unlock(&hdr->block_mutex);
	return blk;
}

/*
 * page allocation for DMA (contiguous version)
 */
static struct snd_util_memblk *
snd_trident_alloc_cont_pages(struct snd_trident *trident,
			     struct snd_pcm_substream *substream)
{
	struct snd_util_memhdr *hdr;
	struct snd_util_memblk *blk;
	int page;
	struct snd_pcm_runtime *runtime = substream->runtime;
	dma_addr_t addr;
	unsigned long ptr;

	if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
		       runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
					SNDRV_TRIDENT_PAGE_SIZE))
		return NULL;
	hdr = trident->tlb.memhdr;
	if (snd_BUG_ON(!hdr))
		return NULL;

	mutex_lock(&hdr->block_mutex);
	blk = search_empty(hdr, runtime->dma_bytes);
	if (blk == NULL) {
		mutex_unlock(&hdr->block_mutex);
		return NULL;
	}
			   
	/* set TLB entries */
	addr = runtime->dma_addr;
	ptr = (unsigned long)runtime->dma_area;
	for (page = firstpg(blk); page <= lastpg(blk); page++,
	     ptr += SNDRV_TRIDENT_PAGE_SIZE, addr += SNDRV_TRIDENT_PAGE_SIZE) {
		if (! is_valid_page(addr)) {
			__snd_util_mem_free(hdr, blk);
			mutex_unlock(&hdr->block_mutex);
			return NULL;
		}
		set_tlb_bus(trident, page, ptr, addr);
	}
	mutex_unlock(&hdr->block_mutex);
	return blk;
}

/*
 * page allocation for DMA
 */
struct snd_util_memblk *
snd_trident_alloc_pages(struct snd_trident *trident,
			struct snd_pcm_substream *substream)
{
	if (snd_BUG_ON(!trident || !substream))
		return NULL;
	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
		return snd_trident_alloc_sg_pages(trident, substream);
	else
		return snd_trident_alloc_cont_pages(trident, substream);
}


/*
 * release DMA buffer from page table
 */
int snd_trident_free_pages(struct snd_trident *trident,
			   struct snd_util_memblk *blk)
{
	struct snd_util_memhdr *hdr;
	int page;

	if (snd_BUG_ON(!trident || !blk))
		return -EINVAL;

	hdr = trident->tlb.memhdr;
	mutex_lock(&hdr->block_mutex);
	/* reset TLB entries */
	for (page = firstpg(blk); page <= lastpg(blk); page++)
		set_silent_tlb(trident, page);
	/* free memory block */
	__snd_util_mem_free(hdr, blk);
	mutex_unlock(&hdr->block_mutex);
	return 0;
}
Commit	Line	Data
1da177e4	1	/*
c1017a4c	2	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	3	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
	4	* Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
	5	*
	6	* Trident 4DWave-NX memory page allocation (TLB area)
	7	* Trident chip can handle only 16MByte of the memory at the same time.
	8	*
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*
	24	*/
	25
1da177e4 LT	26	#include <asm/io.h>
	27	#include <linux/pci.h>
	28	#include <linux/time.h>
62932df8 IM	29	#include <linux/mutex.h>
62932df8 IM	30
1da177e4 LT	31	#include <sound/core.h>
	32	#include <sound/trident.h>
	33
	34	/* page arguments of these two macros are Trident page (4096 bytes), not like
	35	* aligned pages in others
	36	*/
	37	#define __set_tlb_bus(trident,page,ptr,addr) \
	38	do { (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)); \
	39	(trident)->tlb.shadow_entries[page] = (ptr); } while (0)
	40	#define __tlb_to_ptr(trident,page) \
	41	(void*)((trident)->tlb.shadow_entries[page])
	42	#define __tlb_to_addr(trident,page) \
	43	(dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
	44
	45	#if PAGE_SIZE == 4096
	46	/* page size == SNDRV_TRIDENT_PAGE_SIZE */
	47	#define ALIGN_PAGE_SIZE PAGE_SIZE /* minimum page size for allocation */
	48	#define MAX_ALIGN_PAGES SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */
	49	/* fill TLB entrie(s) corresponding to page with ptr */
	50	#define set_tlb_bus(trident,page,ptr,addr) __set_tlb_bus(trident,page,ptr,addr)
	51	/* fill TLB entrie(s) corresponding to page with silence pointer */
	52	#define set_silent_tlb(trident,page) __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr)
	53	/* get aligned page from offset address */
	54	#define get_aligned_page(offset) ((offset) >> 12)
	55	/* get offset address from aligned page */
	56	#define aligned_page_offset(page) ((page) << 12)
	57	/* get buffer address from aligned page */
	58	#define page_to_ptr(trident,page) __tlb_to_ptr(trident, page)
	59	/* get PCI physical address from aligned page */
	60	#define page_to_addr(trident,page) __tlb_to_addr(trident, page)
	61
	62	#elif PAGE_SIZE == 8192
	63	/* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
	64	#define ALIGN_PAGE_SIZE PAGE_SIZE
	65	#define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / 2)
	66	#define get_aligned_page(offset) ((offset) >> 13)
	67	#define aligned_page_offset(page) ((page) << 13)
	68	#define page_to_ptr(trident,page) __tlb_to_ptr(trident, (page) << 1)
	69	#define page_to_addr(trident,page) __tlb_to_addr(trident, (page) << 1)
	70
	71	/* fill TLB entries -- we need to fill two entries */
bee1a5be TI	72	static inline void set_tlb_bus(struct snd_trident *trident, int page,
bee1a5be TI	73	unsigned long ptr, dma_addr_t addr)
1da177e4 LT	74	{
	75	page <<= 1;
	76	__set_tlb_bus(trident, page, ptr, addr);
	77	__set_tlb_bus(trident, page+1, ptr + SNDRV_TRIDENT_PAGE_SIZE, addr + SNDRV_TRIDENT_PAGE_SIZE);
	78	}
bee1a5be	79	static inline void set_silent_tlb(struct snd_trident *trident, int page)
1da177e4 LT	80	{
	81	page <<= 1;
	82	__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
	83	__set_tlb_bus(trident, page+1, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
	84	}
	85
	86	#else
	87	/* arbitrary size */
	88	#define UNIT_PAGES (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
	89	#define ALIGN_PAGE_SIZE (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
	90	#define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
	91	/* Note: if alignment doesn't match to the maximum size, the last few blocks
	92	* become unusable. To use such blocks, you'll need to check the validity
	93	* of accessing page in set_tlb_bus and set_silent_tlb. search_empty()
	94	* should also check it, too.
	95	*/
	96	#define get_aligned_page(offset) ((offset) / ALIGN_PAGE_SIZE)
	97	#define aligned_page_offset(page) ((page) * ALIGN_PAGE_SIZE)
	98	#define page_to_ptr(trident,page) __tlb_to_ptr(trident, (page) * UNIT_PAGES)
	99	#define page_to_addr(trident,page) __tlb_to_addr(trident, (page) * UNIT_PAGES)
	100
	101	/* fill TLB entries -- UNIT_PAGES entries must be filled */
bee1a5be TI	102	static inline void set_tlb_bus(struct snd_trident *trident, int page,
bee1a5be TI	103	unsigned long ptr, dma_addr_t addr)
1da177e4 LT	104	{
	105	int i;
	106	page *= UNIT_PAGES;
	107	for (i = 0; i < UNIT_PAGES; i++, page++) {
	108	__set_tlb_bus(trident, page, ptr, addr);
	109	ptr += SNDRV_TRIDENT_PAGE_SIZE;
	110	addr += SNDRV_TRIDENT_PAGE_SIZE;
	111	}
	112	}
bee1a5be	113	static inline void set_silent_tlb(struct snd_trident *trident, int page)
1da177e4 LT	114	{
	115	int i;
	116	page *= UNIT_PAGES;
	117	for (i = 0; i < UNIT_PAGES; i++, page++)
	118	__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
	119	}
	120
	121	#endif /* PAGE_SIZE */
	122
	123	/* calculate buffer pointer from offset address */
bee1a5be	124	static inline void offset_ptr(struct snd_trident trident, int offset)
1da177e4 LT	125	{
	126	char *ptr;
	127	ptr = page_to_ptr(trident, get_aligned_page(offset));
	128	ptr += offset % ALIGN_PAGE_SIZE;
	129	return (void*)ptr;
	130	}
	131
	132	/* first and last (aligned) pages of memory block */
bee1a5be TI	133	#define firstpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
bee1a5be TI	134	#define lastpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
1da177e4 LT	135
	136	/*
	137	* search empty pages which may contain given size
	138	*/
bee1a5be TI	139	static struct snd_util_memblk *
bee1a5be TI	140	search_empty(struct snd_util_memhdr *hdr, int size)
1da177e4	141	{
bee1a5be	142	struct snd_util_memblk blk, prev;
1da177e4 LT	143	int page, psize;
	144	struct list_head *p;
	145
	146	psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
	147	prev = NULL;
	148	page = 0;
	149	list_for_each(p, &hdr->block) {
bee1a5be	150	blk = list_entry(p, struct snd_util_memblk, list);
1da177e4 LT	151	if (page + psize <= firstpg(blk))
	152	goto __found_pages;
	153	page = lastpg(blk) + 1;
	154	}
	155	if (page + psize > MAX_ALIGN_PAGES)
	156	return NULL;
	157
	158	__found_pages:
	159	/* create a new memory block */
	160	blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
	161	if (blk == NULL)
	162	return NULL;
	163	blk->offset = aligned_page_offset(page); /* set aligned offset */
	164	firstpg(blk) = page;
	165	lastpg(blk) = page + psize - 1;
	166	return blk;
	167	}
	168
	169
	170	/*
	171	* check if the given pointer is valid for pages
	172	*/
	173	static int is_valid_page(unsigned long ptr)
	174	{
	175	if (ptr & ~0x3fffffffUL) {
99b359ba	176	snd_printk(KERN_ERR "max memory size is 1GB!!\n");
1da177e4 LT	177	return 0;
	178	}
	179	if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
99b359ba	180	snd_printk(KERN_ERR "page is not aligned\n");
1da177e4 LT	181	return 0;
	182	}
	183	return 1;
	184	}
	185
	186	/*
	187	* page allocation for DMA (Scatter-Gather version)
	188	*/
bee1a5be TI	189	static struct snd_util_memblk *
	190	snd_trident_alloc_sg_pages(struct snd_trident *trident,
	191	struct snd_pcm_substream *substream)
1da177e4	192	{
bee1a5be TI	193	struct snd_util_memhdr *hdr;
	194	struct snd_util_memblk *blk;
	195	struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4	196	int idx, page;
1da177e4	197
da3cec35 TI	198	if (snd_BUG_ON(runtime->dma_bytes <= 0 \|\|
	199	runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
	200	SNDRV_TRIDENT_PAGE_SIZE))
	201	return NULL;
1da177e4	202	hdr = trident->tlb.memhdr;
da3cec35 TI	203	if (snd_BUG_ON(!hdr))
da3cec35 TI	204	return NULL;
1da177e4 LT	205
	206
	207
62932df8	208	mutex_lock(&hdr->block_mutex);
1da177e4 LT	209	blk = search_empty(hdr, runtime->dma_bytes);
1da177e4 LT	210	if (blk == NULL) {
62932df8	211	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	212	return NULL;
1da177e4 LT	213	}
1da177e4 LT	214
	215	/* set TLB entries */
	216	idx = 0;
	217	for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
77a23f26 TI	218	unsigned long ofs = idx << PAGE_SHIFT;
	219	dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
	220	unsigned long ptr = (unsigned long)
	221	snd_pcm_sgbuf_get_ptr(substream, ofs);
1da177e4 LT	222	if (! is_valid_page(addr)) {
1da177e4 LT	223	__snd_util_mem_free(hdr, blk);
62932df8	224	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	225	return NULL;
	226	}
	227	set_tlb_bus(trident, page, ptr, addr);
	228	}
62932df8	229	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	230	return blk;
	231	}
	232
	233	/*
	234	* page allocation for DMA (contiguous version)
	235	*/
bee1a5be TI	236	static struct snd_util_memblk *
	237	snd_trident_alloc_cont_pages(struct snd_trident *trident,
	238	struct snd_pcm_substream *substream)
1da177e4	239	{
bee1a5be TI	240	struct snd_util_memhdr *hdr;
bee1a5be TI	241	struct snd_util_memblk *blk;
1da177e4	242	int page;
bee1a5be	243	struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 LT	244	dma_addr_t addr;
	245	unsigned long ptr;
	246
da3cec35 TI	247	if (snd_BUG_ON(runtime->dma_bytes <= 0 \|\|
	248	runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
	249	SNDRV_TRIDENT_PAGE_SIZE))
	250	return NULL;
1da177e4	251	hdr = trident->tlb.memhdr;
da3cec35 TI	252	if (snd_BUG_ON(!hdr))
da3cec35 TI	253	return NULL;
1da177e4	254
62932df8	255	mutex_lock(&hdr->block_mutex);
1da177e4 LT	256	blk = search_empty(hdr, runtime->dma_bytes);
1da177e4 LT	257	if (blk == NULL) {
62932df8	258	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	259	return NULL;
	260	}
	261
	262	/* set TLB entries */
	263	addr = runtime->dma_addr;
	264	ptr = (unsigned long)runtime->dma_area;
	265	for (page = firstpg(blk); page <= lastpg(blk); page++,
	266	ptr += SNDRV_TRIDENT_PAGE_SIZE, addr += SNDRV_TRIDENT_PAGE_SIZE) {
	267	if (! is_valid_page(addr)) {
	268	__snd_util_mem_free(hdr, blk);
62932df8	269	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	270	return NULL;
	271	}
	272	set_tlb_bus(trident, page, ptr, addr);
	273	}
62932df8	274	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	275	return blk;
	276	}
	277
	278	/*
	279	* page allocation for DMA
	280	*/
bee1a5be TI	281	struct snd_util_memblk *
	282	snd_trident_alloc_pages(struct snd_trident *trident,
	283	struct snd_pcm_substream *substream)
1da177e4	284	{
da3cec35 TI	285	if (snd_BUG_ON(!trident \|\| !substream))
da3cec35 TI	286	return NULL;
1da177e4 LT	287	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
	288	return snd_trident_alloc_sg_pages(trident, substream);
	289	else
	290	return snd_trident_alloc_cont_pages(trident, substream);
	291	}
	292
	293
	294	/*
	295	* release DMA buffer from page table
	296	*/
bee1a5be TI	297	int snd_trident_free_pages(struct snd_trident *trident,
bee1a5be TI	298	struct snd_util_memblk *blk)
1da177e4	299	{
bee1a5be	300	struct snd_util_memhdr *hdr;
1da177e4 LT	301	int page;
1da177e4 LT	302
da3cec35 TI	303	if (snd_BUG_ON(!trident \|\| !blk))
da3cec35 TI	304	return -EINVAL;
1da177e4 LT	305
1da177e4 LT	306	hdr = trident->tlb.memhdr;
62932df8	307	mutex_lock(&hdr->block_mutex);
1da177e4 LT	308	/* reset TLB entries */
	309	for (page = firstpg(blk); page <= lastpg(blk); page++)
	310	set_silent_tlb(trident, page);
	311	/* free memory block */
	312	__snd_util_mem_free(hdr, blk);
62932df8	313	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	314	return 0;
1da177e4 LT	315	}