diff options
Diffstat (limited to 'sound/pci/trident/trident_memory.c')
| -rw-r--r-- | sound/pci/trident/trident_memory.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/sound/pci/trident/trident_memory.c b/sound/pci/trident/trident_memory.c new file mode 100644 index 000000000..b9ebb5189 --- /dev/null +++ b/sound/pci/trident/trident_memory.c @@ -0,0 +1,314 @@ +/* + * 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 <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; +} |