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DEFINITIONS
This source file includes following definitions.
- set_tlb_bus
- set_silent_tlb
- set_tlb_bus
- set_silent_tlb
- offset_ptr
- search_empty
- is_valid_page
- snd_trident_alloc_sg_pages
- snd_trident_alloc_cont_pages
- snd_trident_alloc_pages
- snd_trident_free_pages
/*
* 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;
}