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299 lines
9.1 KiB
299 lines
9.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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* Copyright (c) by Takashi Iwai <[email protected]> |
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* Copyright (c) by Scott McNab <[email protected]> |
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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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#include <linux/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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