[linux-block.git] / sound / pci / trident / trident_memory.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  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.
 */

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

#include <sound/core.h>
#include "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;
	int page, psize;
	struct list_head *p;

	psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
	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
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
c1017a4c	3	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	4	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
	5	* Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
	6	*
	7	* Trident 4DWave-NX memory page allocation (TLB area)
	8	* Trident chip can handle only 16MByte of the memory at the same time.
1da177e4 LT	9	*/
1da177e4 LT	10
6cbbfe1c	11	#include <linux/io.h>
1da177e4 LT	12	#include <linux/pci.h>
1da177e4 LT	13	#include <linux/time.h>
62932df8 IM	14	#include <linux/mutex.h>
62932df8 IM	15
1da177e4	16	#include <sound/core.h>
81fcb170	17	#include "trident.h"
1da177e4 LT	18
	19	/* page arguments of these two macros are Trident page (4096 bytes), not like
	20	* aligned pages in others
	21	*/
	22	#define __set_tlb_bus(trident,page,ptr,addr) \
	23	do { (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)); \
	24	(trident)->tlb.shadow_entries[page] = (ptr); } while (0)
	25	#define __tlb_to_ptr(trident,page) \
	26	(void*)((trident)->tlb.shadow_entries[page])
	27	#define __tlb_to_addr(trident,page) \
	28	(dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
	29
	30	#if PAGE_SIZE == 4096
	31	/* page size == SNDRV_TRIDENT_PAGE_SIZE */
	32	#define ALIGN_PAGE_SIZE PAGE_SIZE /* minimum page size for allocation */
	33	#define MAX_ALIGN_PAGES SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */
	34	/* fill TLB entrie(s) corresponding to page with ptr */
	35	#define set_tlb_bus(trident,page,ptr,addr) __set_tlb_bus(trident,page,ptr,addr)
	36	/* fill TLB entrie(s) corresponding to page with silence pointer */
	37	#define set_silent_tlb(trident,page) __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr)
	38	/* get aligned page from offset address */
	39	#define get_aligned_page(offset) ((offset) >> 12)
	40	/* get offset address from aligned page */
	41	#define aligned_page_offset(page) ((page) << 12)
	42	/* get buffer address from aligned page */
	43	#define page_to_ptr(trident,page) __tlb_to_ptr(trident, page)
	44	/* get PCI physical address from aligned page */
	45	#define page_to_addr(trident,page) __tlb_to_addr(trident, page)
	46
	47	#elif PAGE_SIZE == 8192
	48	/* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
	49	#define ALIGN_PAGE_SIZE PAGE_SIZE
	50	#define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / 2)
	51	#define get_aligned_page(offset) ((offset) >> 13)
	52	#define aligned_page_offset(page) ((page) << 13)
	53	#define page_to_ptr(trident,page) __tlb_to_ptr(trident, (page) << 1)
	54	#define page_to_addr(trident,page) __tlb_to_addr(trident, (page) << 1)
	55
	56	/* fill TLB entries -- we need to fill two entries */
bee1a5be TI	57	static inline void set_tlb_bus(struct snd_trident *trident, int page,
bee1a5be TI	58	unsigned long ptr, dma_addr_t addr)
1da177e4 LT	59	{
	60	page <<= 1;
	61	__set_tlb_bus(trident, page, ptr, addr);
	62	__set_tlb_bus(trident, page+1, ptr + SNDRV_TRIDENT_PAGE_SIZE, addr + SNDRV_TRIDENT_PAGE_SIZE);
	63	}
bee1a5be	64	static inline void set_silent_tlb(struct snd_trident *trident, int page)
1da177e4 LT	65	{
	66	page <<= 1;
	67	__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
	68	__set_tlb_bus(trident, page+1, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
	69	}
	70
	71	#else
	72	/* arbitrary size */
	73	#define UNIT_PAGES (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
	74	#define ALIGN_PAGE_SIZE (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
	75	#define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
	76	/* Note: if alignment doesn't match to the maximum size, the last few blocks
	77	* become unusable. To use such blocks, you'll need to check the validity
	78	* of accessing page in set_tlb_bus and set_silent_tlb. search_empty()
	79	* should also check it, too.
	80	*/
	81	#define get_aligned_page(offset) ((offset) / ALIGN_PAGE_SIZE)
	82	#define aligned_page_offset(page) ((page) * ALIGN_PAGE_SIZE)
	83	#define page_to_ptr(trident,page) __tlb_to_ptr(trident, (page) * UNIT_PAGES)
	84	#define page_to_addr(trident,page) __tlb_to_addr(trident, (page) * UNIT_PAGES)
	85
	86	/* fill TLB entries -- UNIT_PAGES entries must be filled */
bee1a5be TI	87	static inline void set_tlb_bus(struct snd_trident *trident, int page,
bee1a5be TI	88	unsigned long ptr, dma_addr_t addr)
1da177e4 LT	89	{
	90	int i;
	91	page *= UNIT_PAGES;
	92	for (i = 0; i < UNIT_PAGES; i++, page++) {
	93	__set_tlb_bus(trident, page, ptr, addr);
	94	ptr += SNDRV_TRIDENT_PAGE_SIZE;
	95	addr += SNDRV_TRIDENT_PAGE_SIZE;
	96	}
	97	}
bee1a5be	98	static inline void set_silent_tlb(struct snd_trident *trident, int page)
1da177e4 LT	99	{
	100	int i;
	101	page *= UNIT_PAGES;
	102	for (i = 0; i < UNIT_PAGES; i++, page++)
	103	__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
	104	}
	105
	106	#endif /* PAGE_SIZE */
	107
	108	/* calculate buffer pointer from offset address */
bee1a5be	109	static inline void offset_ptr(struct snd_trident trident, int offset)
1da177e4 LT	110	{
	111	char *ptr;
	112	ptr = page_to_ptr(trident, get_aligned_page(offset));
	113	ptr += offset % ALIGN_PAGE_SIZE;
	114	return (void*)ptr;
	115	}
	116
	117	/* first and last (aligned) pages of memory block */
bee1a5be TI	118	#define firstpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
bee1a5be TI	119	#define lastpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
1da177e4 LT	120
	121	/*
	122	* search empty pages which may contain given size
	123	*/
bee1a5be TI	124	static struct snd_util_memblk *
bee1a5be TI	125	search_empty(struct snd_util_memhdr *hdr, int size)
1da177e4	126	{
e2ff8406	127	struct snd_util_memblk *blk;
1da177e4 LT	128	int page, psize;
	129	struct list_head *p;
	130
	131	psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
1da177e4 LT	132	page = 0;
1da177e4 LT	133	list_for_each(p, &hdr->block) {
bee1a5be	134	blk = list_entry(p, struct snd_util_memblk, list);
1da177e4 LT	135	if (page + psize <= firstpg(blk))
	136	goto __found_pages;
	137	page = lastpg(blk) + 1;
	138	}
	139	if (page + psize > MAX_ALIGN_PAGES)
	140	return NULL;
	141
	142	__found_pages:
	143	/* create a new memory block */
	144	blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
	145	if (blk == NULL)
	146	return NULL;
	147	blk->offset = aligned_page_offset(page); /* set aligned offset */
	148	firstpg(blk) = page;
	149	lastpg(blk) = page + psize - 1;
	150	return blk;
	151	}
	152
	153
	154	/*
	155	* check if the given pointer is valid for pages
	156	*/
	157	static int is_valid_page(unsigned long ptr)
	158	{
	159	if (ptr & ~0x3fffffffUL) {
99b359ba	160	snd_printk(KERN_ERR "max memory size is 1GB!!\n");
1da177e4 LT	161	return 0;
	162	}
	163	if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
99b359ba	164	snd_printk(KERN_ERR "page is not aligned\n");
1da177e4 LT	165	return 0;
	166	}
	167	return 1;
	168	}
	169
	170	/*
	171	* page allocation for DMA (Scatter-Gather version)
	172	*/
bee1a5be TI	173	static struct snd_util_memblk *
	174	snd_trident_alloc_sg_pages(struct snd_trident *trident,
	175	struct snd_pcm_substream *substream)
1da177e4	176	{
bee1a5be TI	177	struct snd_util_memhdr *hdr;
	178	struct snd_util_memblk *blk;
	179	struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4	180	int idx, page;
1da177e4	181
da3cec35 TI	182	if (snd_BUG_ON(runtime->dma_bytes <= 0 \|\|
	183	runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
	184	SNDRV_TRIDENT_PAGE_SIZE))
	185	return NULL;
1da177e4	186	hdr = trident->tlb.memhdr;
da3cec35 TI	187	if (snd_BUG_ON(!hdr))
da3cec35 TI	188	return NULL;
1da177e4 LT	189
	190
	191
62932df8	192	mutex_lock(&hdr->block_mutex);
1da177e4 LT	193	blk = search_empty(hdr, runtime->dma_bytes);
1da177e4 LT	194	if (blk == NULL) {
62932df8	195	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	196	return NULL;
1da177e4 LT	197	}
1da177e4 LT	198
	199	/* set TLB entries */
	200	idx = 0;
	201	for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
77a23f26 TI	202	unsigned long ofs = idx << PAGE_SHIFT;
	203	dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
	204	unsigned long ptr = (unsigned long)
	205	snd_pcm_sgbuf_get_ptr(substream, ofs);
1da177e4 LT	206	if (! is_valid_page(addr)) {
1da177e4 LT	207	__snd_util_mem_free(hdr, blk);
62932df8	208	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	209	return NULL;
	210	}
	211	set_tlb_bus(trident, page, ptr, addr);
	212	}
62932df8	213	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	214	return blk;
	215	}
	216
	217	/*
	218	* page allocation for DMA (contiguous version)
	219	*/
bee1a5be TI	220	static struct snd_util_memblk *
	221	snd_trident_alloc_cont_pages(struct snd_trident *trident,
	222	struct snd_pcm_substream *substream)
1da177e4	223	{
bee1a5be TI	224	struct snd_util_memhdr *hdr;
bee1a5be TI	225	struct snd_util_memblk *blk;
1da177e4	226	int page;
bee1a5be	227	struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 LT	228	dma_addr_t addr;
	229	unsigned long ptr;
	230
da3cec35 TI	231	if (snd_BUG_ON(runtime->dma_bytes <= 0 \|\|
	232	runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
	233	SNDRV_TRIDENT_PAGE_SIZE))
	234	return NULL;
1da177e4	235	hdr = trident->tlb.memhdr;
da3cec35 TI	236	if (snd_BUG_ON(!hdr))
da3cec35 TI	237	return NULL;
1da177e4	238
62932df8	239	mutex_lock(&hdr->block_mutex);
1da177e4 LT	240	blk = search_empty(hdr, runtime->dma_bytes);
1da177e4 LT	241	if (blk == NULL) {
62932df8	242	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	243	return NULL;
	244	}
	245
	246	/* set TLB entries */
	247	addr = runtime->dma_addr;
	248	ptr = (unsigned long)runtime->dma_area;
	249	for (page = firstpg(blk); page <= lastpg(blk); page++,
	250	ptr += SNDRV_TRIDENT_PAGE_SIZE, addr += SNDRV_TRIDENT_PAGE_SIZE) {
	251	if (! is_valid_page(addr)) {
	252	__snd_util_mem_free(hdr, blk);
62932df8	253	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	254	return NULL;
	255	}
	256	set_tlb_bus(trident, page, ptr, addr);
	257	}
62932df8	258	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	259	return blk;
	260	}
	261
	262	/*
	263	* page allocation for DMA
	264	*/
bee1a5be TI	265	struct snd_util_memblk *
	266	snd_trident_alloc_pages(struct snd_trident *trident,
	267	struct snd_pcm_substream *substream)
1da177e4	268	{
da3cec35 TI	269	if (snd_BUG_ON(!trident \|\| !substream))
da3cec35 TI	270	return NULL;
1da177e4 LT	271	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
	272	return snd_trident_alloc_sg_pages(trident, substream);
	273	else
	274	return snd_trident_alloc_cont_pages(trident, substream);
	275	}
	276
	277
	278	/*
	279	* release DMA buffer from page table
	280	*/
bee1a5be TI	281	int snd_trident_free_pages(struct snd_trident *trident,
bee1a5be TI	282	struct snd_util_memblk *blk)
1da177e4	283	{
bee1a5be	284	struct snd_util_memhdr *hdr;
1da177e4 LT	285	int page;
1da177e4 LT	286
da3cec35 TI	287	if (snd_BUG_ON(!trident \|\| !blk))
da3cec35 TI	288	return -EINVAL;
1da177e4 LT	289
1da177e4 LT	290	hdr = trident->tlb.memhdr;
62932df8	291	mutex_lock(&hdr->block_mutex);
1da177e4 LT	292	/* reset TLB entries */
	293	for (page = firstpg(blk); page <= lastpg(blk); page++)
	294	set_silent_tlb(trident, page);
	295	/* free memory block */
	296	__snd_util_mem_free(hdr, blk);
62932df8	297	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	298	return 0;
1da177e4 LT	299	}