315 lines
9.7 KiB
C
315 lines
9.7 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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* Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
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*
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* Trident 4DWave-NX memory page allocation (TLB area)
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* Trident chip can handle only 16MByte of the memory at the same time.
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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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#include <asm/io.h>
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#include <linux/pci.h>
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#include <linux/time.h>
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#include <linux/mutex.h>
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#include <sound/core.h>
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#include "trident.h"
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/* page arguments of these two macros are Trident page (4096 bytes), not like
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* aligned pages in others
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*/
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#define __set_tlb_bus(trident,page,ptr,addr) \
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do { (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)); \
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(trident)->tlb.shadow_entries[page] = (ptr); } while (0)
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#define __tlb_to_ptr(trident,page) \
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(void*)((trident)->tlb.shadow_entries[page])
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#define __tlb_to_addr(trident,page) \
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(dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
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#if PAGE_SIZE == 4096
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/* page size == SNDRV_TRIDENT_PAGE_SIZE */
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#define ALIGN_PAGE_SIZE PAGE_SIZE /* minimum page size for allocation */
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#define MAX_ALIGN_PAGES SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */
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/* fill TLB entrie(s) corresponding to page with ptr */
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#define set_tlb_bus(trident,page,ptr,addr) __set_tlb_bus(trident,page,ptr,addr)
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/* fill TLB entrie(s) corresponding to page with silence pointer */
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#define set_silent_tlb(trident,page) __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr)
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/* get aligned page from offset address */
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#define get_aligned_page(offset) ((offset) >> 12)
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/* get offset address from aligned page */
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#define aligned_page_offset(page) ((page) << 12)
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/* get buffer address from aligned page */
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#define page_to_ptr(trident,page) __tlb_to_ptr(trident, page)
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/* get PCI physical address from aligned page */
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#define page_to_addr(trident,page) __tlb_to_addr(trident, page)
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#elif PAGE_SIZE == 8192
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/* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
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#define ALIGN_PAGE_SIZE PAGE_SIZE
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#define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / 2)
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#define get_aligned_page(offset) ((offset) >> 13)
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#define aligned_page_offset(page) ((page) << 13)
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#define page_to_ptr(trident,page) __tlb_to_ptr(trident, (page) << 1)
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#define page_to_addr(trident,page) __tlb_to_addr(trident, (page) << 1)
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/* fill TLB entries -- we need to fill two entries */
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static inline void set_tlb_bus(struct snd_trident *trident, int page,
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unsigned long ptr, dma_addr_t addr)
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{
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page <<= 1;
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__set_tlb_bus(trident, page, ptr, addr);
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__set_tlb_bus(trident, page+1, ptr + SNDRV_TRIDENT_PAGE_SIZE, addr + SNDRV_TRIDENT_PAGE_SIZE);
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}
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static inline void set_silent_tlb(struct snd_trident *trident, int page)
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{
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page <<= 1;
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__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
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__set_tlb_bus(trident, page+1, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
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}
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#else
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/* arbitrary size */
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#define UNIT_PAGES (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
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#define ALIGN_PAGE_SIZE (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
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#define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
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/* Note: if alignment doesn't match to the maximum size, the last few blocks
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* become unusable. To use such blocks, you'll need to check the validity
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* of accessing page in set_tlb_bus and set_silent_tlb. search_empty()
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* should also check it, too.
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*/
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#define get_aligned_page(offset) ((offset) / ALIGN_PAGE_SIZE)
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#define aligned_page_offset(page) ((page) * ALIGN_PAGE_SIZE)
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#define page_to_ptr(trident,page) __tlb_to_ptr(trident, (page) * UNIT_PAGES)
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#define page_to_addr(trident,page) __tlb_to_addr(trident, (page) * UNIT_PAGES)
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/* fill TLB entries -- UNIT_PAGES entries must be filled */
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static inline void set_tlb_bus(struct snd_trident *trident, int page,
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unsigned long ptr, dma_addr_t addr)
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{
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int i;
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page *= UNIT_PAGES;
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for (i = 0; i < UNIT_PAGES; i++, page++) {
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__set_tlb_bus(trident, page, ptr, addr);
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ptr += SNDRV_TRIDENT_PAGE_SIZE;
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addr += SNDRV_TRIDENT_PAGE_SIZE;
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}
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}
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static inline void set_silent_tlb(struct snd_trident *trident, int page)
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{
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int i;
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page *= UNIT_PAGES;
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for (i = 0; i < UNIT_PAGES; i++, page++)
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__set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
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}
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#endif /* PAGE_SIZE */
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/* calculate buffer pointer from offset address */
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static inline void *offset_ptr(struct snd_trident *trident, int offset)
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{
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char *ptr;
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ptr = page_to_ptr(trident, get_aligned_page(offset));
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ptr += offset % ALIGN_PAGE_SIZE;
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return (void*)ptr;
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}
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/* first and last (aligned) pages of memory block */
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#define firstpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
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#define lastpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
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/*
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* search empty pages which may contain given size
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*/
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static struct snd_util_memblk *
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search_empty(struct snd_util_memhdr *hdr, int size)
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{
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struct snd_util_memblk *blk;
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int page, psize;
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struct list_head *p;
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psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
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page = 0;
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list_for_each(p, &hdr->block) {
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blk = list_entry(p, struct snd_util_memblk, list);
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if (page + psize <= firstpg(blk))
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goto __found_pages;
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page = lastpg(blk) + 1;
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}
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if (page + psize > MAX_ALIGN_PAGES)
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return NULL;
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__found_pages:
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/* create a new memory block */
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blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
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if (blk == NULL)
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return NULL;
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blk->offset = aligned_page_offset(page); /* set aligned offset */
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firstpg(blk) = page;
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lastpg(blk) = page + psize - 1;
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return blk;
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}
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/*
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* check if the given pointer is valid for pages
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*/
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static int is_valid_page(unsigned long ptr)
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{
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if (ptr & ~0x3fffffffUL) {
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snd_printk(KERN_ERR "max memory size is 1GB!!\n");
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return 0;
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}
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if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
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snd_printk(KERN_ERR "page is not aligned\n");
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return 0;
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}
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return 1;
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}
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/*
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* page allocation for DMA (Scatter-Gather version)
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*/
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static struct snd_util_memblk *
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snd_trident_alloc_sg_pages(struct snd_trident *trident,
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struct snd_pcm_substream *substream)
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{
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struct snd_util_memhdr *hdr;
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struct snd_util_memblk *blk;
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struct snd_pcm_runtime *runtime = substream->runtime;
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int idx, page;
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if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
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runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
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SNDRV_TRIDENT_PAGE_SIZE))
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return NULL;
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hdr = trident->tlb.memhdr;
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if (snd_BUG_ON(!hdr))
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return NULL;
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mutex_lock(&hdr->block_mutex);
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blk = search_empty(hdr, runtime->dma_bytes);
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if (blk == NULL) {
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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/* set TLB entries */
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idx = 0;
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for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
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unsigned long ofs = idx << PAGE_SHIFT;
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dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
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unsigned long ptr = (unsigned long)
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snd_pcm_sgbuf_get_ptr(substream, ofs);
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if (! is_valid_page(addr)) {
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__snd_util_mem_free(hdr, blk);
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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set_tlb_bus(trident, page, ptr, addr);
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}
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mutex_unlock(&hdr->block_mutex);
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return blk;
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}
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/*
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* page allocation for DMA (contiguous version)
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*/
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static struct snd_util_memblk *
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snd_trident_alloc_cont_pages(struct snd_trident *trident,
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struct snd_pcm_substream *substream)
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{
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struct snd_util_memhdr *hdr;
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struct snd_util_memblk *blk;
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int page;
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struct snd_pcm_runtime *runtime = substream->runtime;
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dma_addr_t addr;
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unsigned long ptr;
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if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
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runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
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SNDRV_TRIDENT_PAGE_SIZE))
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return NULL;
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hdr = trident->tlb.memhdr;
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if (snd_BUG_ON(!hdr))
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return NULL;
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mutex_lock(&hdr->block_mutex);
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blk = search_empty(hdr, runtime->dma_bytes);
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if (blk == NULL) {
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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/* set TLB entries */
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addr = runtime->dma_addr;
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ptr = (unsigned long)runtime->dma_area;
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for (page = firstpg(blk); page <= lastpg(blk); page++,
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ptr += SNDRV_TRIDENT_PAGE_SIZE, addr += SNDRV_TRIDENT_PAGE_SIZE) {
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if (! is_valid_page(addr)) {
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__snd_util_mem_free(hdr, blk);
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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set_tlb_bus(trident, page, ptr, addr);
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}
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mutex_unlock(&hdr->block_mutex);
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return blk;
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}
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/*
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* page allocation for DMA
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*/
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struct snd_util_memblk *
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snd_trident_alloc_pages(struct snd_trident *trident,
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struct snd_pcm_substream *substream)
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{
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if (snd_BUG_ON(!trident || !substream))
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return NULL;
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if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
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return snd_trident_alloc_sg_pages(trident, substream);
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else
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return snd_trident_alloc_cont_pages(trident, substream);
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}
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/*
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* release DMA buffer from page table
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*/
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int snd_trident_free_pages(struct snd_trident *trident,
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struct snd_util_memblk *blk)
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{
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struct snd_util_memhdr *hdr;
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int page;
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if (snd_BUG_ON(!trident || !blk))
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return -EINVAL;
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hdr = trident->tlb.memhdr;
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mutex_lock(&hdr->block_mutex);
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/* reset TLB entries */
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for (page = firstpg(blk); page <= lastpg(blk); page++)
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set_silent_tlb(trident, page);
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/* free memory block */
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__snd_util_mem_free(hdr, blk);
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mutex_unlock(&hdr->block_mutex);
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return 0;
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}
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