mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
1299 lines
36 KiB
C
1299 lines
36 KiB
C
/*
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* sound/dmabuf.c
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*
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* The DMA buffer manager for digitized voice applications
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*/
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/*
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* Copyright (C) by Hannu Savolainen 1993-1997
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*
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* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
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* Version 2 (June 1991). See the "COPYING" file distributed with this software
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* for more info.
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*
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* Thomas Sailer : moved several static variables into struct audio_operations
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* (which is grossly misnamed btw.) because they have the same
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* lifetime as the rest in there and dynamic allocation saves
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* 12k or so
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* Thomas Sailer : remove {in,out}_sleep_flag. It was used for the sleeper to
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* determine if it was woken up by the expiring timeout or by
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* an explicit wake_up. The return value from schedule_timeout
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* can be used instead; if 0, the wakeup was due to the timeout.
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*
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* Rob Riggs Added persistent DMA buffers (1998/10/17)
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*/
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#define BE_CONSERVATIVE
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#define SAMPLE_ROUNDUP 0
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#include "sound_config.h"
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#define DMAP_FREE_ON_CLOSE 0
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#define DMAP_KEEP_ON_CLOSE 1
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extern int sound_dmap_flag;
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static void dma_reset_output(int dev);
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static void dma_reset_input(int dev);
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static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode);
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static int debugmem; /* switched off by default */
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static int dma_buffsize = DSP_BUFFSIZE;
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static long dmabuf_timeout(struct dma_buffparms *dmap)
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{
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long tmout;
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tmout = (dmap->fragment_size * HZ) / dmap->data_rate;
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tmout += HZ / 5; /* Some safety distance */
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if (tmout < (HZ / 2))
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tmout = HZ / 2;
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if (tmout > 20 * HZ)
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tmout = 20 * HZ;
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return tmout;
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}
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static int sound_alloc_dmap(struct dma_buffparms *dmap)
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{
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char *start_addr, *end_addr;
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int dma_pagesize;
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int sz, size;
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struct page *page;
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dmap->mapping_flags &= ~DMA_MAP_MAPPED;
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if (dmap->raw_buf != NULL)
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return 0; /* Already done */
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if (dma_buffsize < 4096)
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dma_buffsize = 4096;
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dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024);
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/*
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* Now check for the Cyrix problem.
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*/
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if(isa_dma_bridge_buggy==2)
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dma_pagesize=32768;
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dmap->raw_buf = NULL;
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dmap->buffsize = dma_buffsize;
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if (dmap->buffsize > dma_pagesize)
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dmap->buffsize = dma_pagesize;
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start_addr = NULL;
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/*
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* Now loop until we get a free buffer. Try to get smaller buffer if
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* it fails. Don't accept smaller than 8k buffer for performance
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* reasons.
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*/
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while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) {
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for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
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dmap->buffsize = PAGE_SIZE * (1 << sz);
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start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA|__GFP_NOWARN, sz);
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if (start_addr == NULL)
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dmap->buffsize /= 2;
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}
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if (start_addr == NULL) {
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printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n");
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return -ENOMEM;
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} else {
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/* make some checks */
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end_addr = start_addr + dmap->buffsize - 1;
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if (debugmem)
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printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr);
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/* now check if it fits into the same dma-pagesize */
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if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1))
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|| end_addr >= (char *) (MAX_DMA_ADDRESS)) {
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printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize);
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return -EFAULT;
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}
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}
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dmap->raw_buf = start_addr;
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dmap->raw_buf_phys = virt_to_bus(start_addr);
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for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
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SetPageReserved(page);
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return 0;
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}
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static void sound_free_dmap(struct dma_buffparms *dmap)
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{
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int sz, size;
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struct page *page;
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unsigned long start_addr, end_addr;
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if (dmap->raw_buf == NULL)
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return;
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if (dmap->mapping_flags & DMA_MAP_MAPPED)
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return; /* Don't free mmapped buffer. Will use it next time */
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for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
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start_addr = (unsigned long) dmap->raw_buf;
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end_addr = start_addr + dmap->buffsize;
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for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
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ClearPageReserved(page);
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free_pages((unsigned long) dmap->raw_buf, sz);
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dmap->raw_buf = NULL;
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}
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/* Intel version !!!!!!!!! */
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static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode)
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{
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unsigned long flags;
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int chan = dmap->dma;
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/* printk( "Start DMA%d %d, %d\n", chan, (int)(physaddr-dmap->raw_buf_phys), count); */
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flags = claim_dma_lock();
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disable_dma(chan);
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clear_dma_ff(chan);
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set_dma_mode(chan, dma_mode);
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set_dma_addr(chan, physaddr);
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set_dma_count(chan, count);
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enable_dma(chan);
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release_dma_lock(flags);
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return 0;
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}
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static void dma_init_buffers(struct dma_buffparms *dmap)
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{
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dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
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dmap->byte_counter = 0;
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dmap->max_byte_counter = 8000 * 60 * 60;
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dmap->bytes_in_use = dmap->buffsize;
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dmap->dma_mode = DMODE_NONE;
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dmap->mapping_flags = 0;
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dmap->neutral_byte = 0x80;
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dmap->data_rate = 8000;
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dmap->cfrag = -1;
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dmap->closing = 0;
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dmap->nbufs = 1;
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dmap->flags = DMA_BUSY; /* Other flags off */
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}
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static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap)
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{
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int err;
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if (dmap->flags & DMA_BUSY)
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return -EBUSY;
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if ((err = sound_alloc_dmap(dmap)) < 0)
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return err;
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if (dmap->raw_buf == NULL) {
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printk(KERN_WARNING "Sound: DMA buffers not available\n");
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return -ENOSPC; /* Memory allocation failed during boot */
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}
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if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) {
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printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma);
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return -EBUSY;
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}
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dma_init_buffers(dmap);
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spin_lock_init(&dmap->lock);
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dmap->open_mode = mode;
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dmap->subdivision = dmap->underrun_count = 0;
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dmap->fragment_size = 0;
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dmap->max_fragments = 65536; /* Just a large value */
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dmap->byte_counter = 0;
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dmap->max_byte_counter = 8000 * 60 * 60;
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dmap->applic_profile = APF_NORMAL;
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dmap->needs_reorg = 1;
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dmap->audio_callback = NULL;
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dmap->callback_parm = 0;
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return 0;
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}
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static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap)
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{
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unsigned long flags;
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if (dmap->dma >= 0) {
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sound_close_dma(dmap->dma);
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flags=claim_dma_lock();
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disable_dma(dmap->dma);
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release_dma_lock(flags);
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}
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if (dmap->flags & DMA_BUSY)
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dmap->dma_mode = DMODE_NONE;
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dmap->flags &= ~DMA_BUSY;
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if (sound_dmap_flag == DMAP_FREE_ON_CLOSE)
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sound_free_dmap(dmap);
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}
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static unsigned int default_set_bits(int dev, unsigned int bits)
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{
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mm_segment_t fs = get_fs();
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set_fs(get_ds());
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audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (void __user *)&bits);
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set_fs(fs);
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return bits;
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}
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static int default_set_speed(int dev, int speed)
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{
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mm_segment_t fs = get_fs();
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set_fs(get_ds());
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audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (void __user *)&speed);
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set_fs(fs);
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return speed;
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}
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static short default_set_channels(int dev, short channels)
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{
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int c = channels;
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mm_segment_t fs = get_fs();
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set_fs(get_ds());
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audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (void __user *)&c);
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set_fs(fs);
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return c;
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}
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static void check_driver(struct audio_driver *d)
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{
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if (d->set_speed == NULL)
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d->set_speed = default_set_speed;
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if (d->set_bits == NULL)
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d->set_bits = default_set_bits;
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if (d->set_channels == NULL)
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d->set_channels = default_set_channels;
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}
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int DMAbuf_open(int dev, int mode)
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{
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struct audio_operations *adev = audio_devs[dev];
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int retval;
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struct dma_buffparms *dmap_in = NULL;
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struct dma_buffparms *dmap_out = NULL;
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if (!adev)
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return -ENXIO;
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if (!(adev->flags & DMA_DUPLEX))
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adev->dmap_in = adev->dmap_out;
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check_driver(adev->d);
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if ((retval = adev->d->open(dev, mode)) < 0)
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return retval;
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dmap_out = adev->dmap_out;
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dmap_in = adev->dmap_in;
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if (dmap_in == dmap_out)
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adev->flags &= ~DMA_DUPLEX;
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if (mode & OPEN_WRITE) {
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if ((retval = open_dmap(adev, mode, dmap_out)) < 0) {
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adev->d->close(dev);
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return retval;
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}
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}
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adev->enable_bits = mode;
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if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) {
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if ((retval = open_dmap(adev, mode, dmap_in)) < 0) {
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adev->d->close(dev);
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if (mode & OPEN_WRITE)
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close_dmap(adev, dmap_out);
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return retval;
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}
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}
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adev->open_mode = mode;
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adev->go = 1;
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adev->d->set_bits(dev, 8);
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adev->d->set_channels(dev, 1);
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adev->d->set_speed(dev, DSP_DEFAULT_SPEED);
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if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
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memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
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adev->dmap_out->bytes_in_use);
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return 0;
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}
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/* MUST not hold the spinlock */
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void DMAbuf_reset(int dev)
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{
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if (audio_devs[dev]->open_mode & OPEN_WRITE)
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dma_reset_output(dev);
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if (audio_devs[dev]->open_mode & OPEN_READ)
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dma_reset_input(dev);
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}
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static void dma_reset_output(int dev)
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{
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struct audio_operations *adev = audio_devs[dev];
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unsigned long flags,f ;
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struct dma_buffparms *dmap = adev->dmap_out;
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if (!(dmap->flags & DMA_STARTED)) /* DMA is not active */
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return;
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/*
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* First wait until the current fragment has been played completely
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*/
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spin_lock_irqsave(&dmap->lock,flags);
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adev->dmap_out->flags |= DMA_SYNCING;
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adev->dmap_out->underrun_count = 0;
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if (!signal_pending(current) && adev->dmap_out->qlen &&
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adev->dmap_out->underrun_count == 0){
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spin_unlock_irqrestore(&dmap->lock,flags);
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interruptible_sleep_on_timeout(&adev->out_sleeper,
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dmabuf_timeout(dmap));
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spin_lock_irqsave(&dmap->lock,flags);
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}
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adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
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/*
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* Finally shut the device off
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*/
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if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output)
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adev->d->halt_io(dev);
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else
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adev->d->halt_output(dev);
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adev->dmap_out->flags &= ~DMA_STARTED;
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f=claim_dma_lock();
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clear_dma_ff(dmap->dma);
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disable_dma(dmap->dma);
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release_dma_lock(f);
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dmap->byte_counter = 0;
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reorganize_buffers(dev, adev->dmap_out, 0);
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dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
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spin_unlock_irqrestore(&dmap->lock,flags);
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}
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static void dma_reset_input(int dev)
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{
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struct audio_operations *adev = audio_devs[dev];
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unsigned long flags;
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struct dma_buffparms *dmap = adev->dmap_in;
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spin_lock_irqsave(&dmap->lock,flags);
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if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input)
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adev->d->halt_io(dev);
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else
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adev->d->halt_input(dev);
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adev->dmap_in->flags &= ~DMA_STARTED;
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dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
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dmap->byte_counter = 0;
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reorganize_buffers(dev, adev->dmap_in, 1);
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spin_unlock_irqrestore(&dmap->lock,flags);
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}
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/* MUST be called with holding the dmap->lock */
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void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap)
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{
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struct audio_operations *adev = audio_devs[dev];
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if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT))
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return; /* Don't start DMA yet */
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dmap->dma_mode = DMODE_OUTPUT;
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if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
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if (!(dmap->flags & DMA_STARTED)) {
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reorganize_buffers(dev, dmap, 0);
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if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs))
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return;
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if (!(dmap->flags & DMA_NODMA))
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local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE);
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dmap->flags |= DMA_STARTED;
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}
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if (dmap->counts[dmap->qhead] == 0)
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dmap->counts[dmap->qhead] = dmap->fragment_size;
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dmap->dma_mode = DMODE_OUTPUT;
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adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size,
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dmap->counts[dmap->qhead], 1);
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if (adev->d->trigger)
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adev->d->trigger(dev,adev->enable_bits * adev->go);
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}
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dmap->flags |= DMA_ACTIVE;
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}
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int DMAbuf_sync(int dev)
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{
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struct audio_operations *adev = audio_devs[dev];
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unsigned long flags;
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int n = 0;
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struct dma_buffparms *dmap;
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if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT))
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return 0;
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if (adev->dmap_out->dma_mode == DMODE_OUTPUT) {
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dmap = adev->dmap_out;
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spin_lock_irqsave(&dmap->lock,flags);
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if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE))
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DMAbuf_launch_output(dev, dmap);
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adev->dmap_out->flags |= DMA_SYNCING;
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adev->dmap_out->underrun_count = 0;
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while (!signal_pending(current) && n++ <= adev->dmap_out->nbufs &&
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adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) {
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long t = dmabuf_timeout(dmap);
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spin_unlock_irqrestore(&dmap->lock,flags);
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/* FIXME: not safe may miss events */
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t = interruptible_sleep_on_timeout(&adev->out_sleeper, t);
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spin_lock_irqsave(&dmap->lock,flags);
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if (!t) {
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adev->dmap_out->flags &= ~DMA_SYNCING;
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spin_unlock_irqrestore(&dmap->lock,flags);
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return adev->dmap_out->qlen;
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}
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}
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adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
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|
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/*
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* Some devices such as GUS have huge amount of on board RAM for the
|
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* audio data. We have to wait until the device has finished playing.
|
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*/
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|
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/* still holding the lock */
|
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if (adev->d->local_qlen) { /* Device has hidden buffers */
|
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while (!signal_pending(current) &&
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adev->d->local_qlen(dev)){
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spin_unlock_irqrestore(&dmap->lock,flags);
|
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interruptible_sleep_on_timeout(&adev->out_sleeper,
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dmabuf_timeout(dmap));
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
}
|
|
adev->dmap_out->dma_mode = DMODE_NONE;
|
|
return adev->dmap_out->qlen;
|
|
}
|
|
|
|
int DMAbuf_release(int dev, int mode)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap;
|
|
unsigned long flags;
|
|
|
|
dmap = adev->dmap_out;
|
|
if (adev->open_mode & OPEN_WRITE)
|
|
adev->dmap_out->closing = 1;
|
|
|
|
if (adev->open_mode & OPEN_READ){
|
|
adev->dmap_in->closing = 1;
|
|
dmap = adev->dmap_in;
|
|
}
|
|
if (adev->open_mode & OPEN_WRITE)
|
|
if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED))
|
|
if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT))
|
|
DMAbuf_sync(dev);
|
|
if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
|
|
memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use);
|
|
|
|
DMAbuf_reset(dev);
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
adev->d->close(dev);
|
|
|
|
if (adev->open_mode & OPEN_WRITE)
|
|
close_dmap(adev, adev->dmap_out);
|
|
|
|
if (adev->open_mode == OPEN_READ ||
|
|
(adev->open_mode != OPEN_WRITE &&
|
|
(adev->flags & DMA_DUPLEX)))
|
|
close_dmap(adev, adev->dmap_in);
|
|
adev->open_mode = 0;
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
return 0;
|
|
}
|
|
/* called with dmap->lock dold */
|
|
int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
int err;
|
|
|
|
if (!(adev->open_mode & OPEN_READ))
|
|
return 0;
|
|
if (!(adev->enable_bits & PCM_ENABLE_INPUT))
|
|
return 0;
|
|
if (dmap->dma_mode == DMODE_OUTPUT) { /* Direction change */
|
|
/* release lock - it's not recursive */
|
|
spin_unlock_irq(&dmap->lock);
|
|
DMAbuf_sync(dev);
|
|
DMAbuf_reset(dev);
|
|
spin_lock_irq(&dmap->lock);
|
|
dmap->dma_mode = DMODE_NONE;
|
|
}
|
|
if (!dmap->dma_mode) {
|
|
reorganize_buffers(dev, dmap, 1);
|
|
if ((err = adev->d->prepare_for_input(dev,
|
|
dmap->fragment_size, dmap->nbufs)) < 0)
|
|
return err;
|
|
dmap->dma_mode = DMODE_INPUT;
|
|
}
|
|
if (!(dmap->flags & DMA_ACTIVE)) {
|
|
if (dmap->needs_reorg)
|
|
reorganize_buffers(dev, dmap, 0);
|
|
local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
|
|
adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
|
|
dmap->fragment_size, 0);
|
|
dmap->flags |= DMA_ACTIVE;
|
|
if (adev->d->trigger)
|
|
adev->d->trigger(dev, adev->enable_bits * adev->go);
|
|
}
|
|
return 0;
|
|
}
|
|
/* aquires lock */
|
|
int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
unsigned long flags;
|
|
int err = 0, n = 0;
|
|
struct dma_buffparms *dmap = adev->dmap_in;
|
|
int go;
|
|
|
|
if (!(adev->open_mode & OPEN_READ))
|
|
return -EIO;
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
if (dmap->needs_reorg)
|
|
reorganize_buffers(dev, dmap, 0);
|
|
if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) {
|
|
/* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
return -EINVAL;
|
|
} else while (dmap->qlen <= 0 && n++ < 10) {
|
|
long timeout = MAX_SCHEDULE_TIMEOUT;
|
|
if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) {
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
return -EAGAIN;
|
|
}
|
|
if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) {
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
return err;
|
|
}
|
|
/* Wait for the next block */
|
|
|
|
if (dontblock) {
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
return -EAGAIN;
|
|
}
|
|
if ((go = adev->go))
|
|
timeout = dmabuf_timeout(dmap);
|
|
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
timeout = interruptible_sleep_on_timeout(&adev->in_sleeper,
|
|
timeout);
|
|
if (!timeout) {
|
|
/* FIXME: include device name */
|
|
err = -EIO;
|
|
printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n");
|
|
dma_reset_input(dev);
|
|
} else
|
|
err = -EINTR;
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
}
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
|
|
if (dmap->qlen <= 0)
|
|
return err ? err : -EINTR;
|
|
*buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]];
|
|
*len = dmap->fragment_size - dmap->counts[dmap->qhead];
|
|
|
|
return dmap->qhead;
|
|
}
|
|
|
|
int DMAbuf_rmchars(int dev, int buff_no, int c)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = adev->dmap_in;
|
|
int p = dmap->counts[dmap->qhead] + c;
|
|
|
|
if (dmap->mapping_flags & DMA_MAP_MAPPED)
|
|
{
|
|
/* printk("Sound: Can't read from mmapped device (2)\n");*/
|
|
return -EINVAL;
|
|
}
|
|
else if (dmap->qlen <= 0)
|
|
return -EIO;
|
|
else if (p >= dmap->fragment_size) { /* This buffer is completely empty */
|
|
dmap->counts[dmap->qhead] = 0;
|
|
dmap->qlen--;
|
|
dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
|
|
}
|
|
else dmap->counts[dmap->qhead] = p;
|
|
|
|
return 0;
|
|
}
|
|
/* MUST be called with dmap->lock hold */
|
|
int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction)
|
|
{
|
|
/*
|
|
* Try to approximate the active byte position of the DMA pointer within the
|
|
* buffer area as well as possible.
|
|
*/
|
|
|
|
int pos;
|
|
unsigned long f;
|
|
|
|
if (!(dmap->flags & DMA_ACTIVE))
|
|
pos = 0;
|
|
else {
|
|
int chan = dmap->dma;
|
|
|
|
f=claim_dma_lock();
|
|
clear_dma_ff(chan);
|
|
|
|
if(!isa_dma_bridge_buggy)
|
|
disable_dma(dmap->dma);
|
|
|
|
pos = get_dma_residue(chan);
|
|
|
|
pos = dmap->bytes_in_use - pos;
|
|
|
|
if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) {
|
|
if (direction == DMODE_OUTPUT) {
|
|
if (dmap->qhead == 0)
|
|
if (pos > dmap->fragment_size)
|
|
pos = 0;
|
|
} else {
|
|
if (dmap->qtail == 0)
|
|
if (pos > dmap->fragment_size)
|
|
pos = 0;
|
|
}
|
|
}
|
|
if (pos < 0)
|
|
pos = 0;
|
|
if (pos >= dmap->bytes_in_use)
|
|
pos = 0;
|
|
|
|
if(!isa_dma_bridge_buggy)
|
|
enable_dma(dmap->dma);
|
|
|
|
release_dma_lock(f);
|
|
}
|
|
/* printk( "%04x ", pos); */
|
|
|
|
return pos;
|
|
}
|
|
|
|
/*
|
|
* DMAbuf_start_devices() is called by the /dev/music driver to start
|
|
* one or more audio devices at desired moment.
|
|
*/
|
|
|
|
void DMAbuf_start_devices(unsigned int devmask)
|
|
{
|
|
struct audio_operations *adev;
|
|
int dev;
|
|
|
|
for (dev = 0; dev < num_audiodevs; dev++) {
|
|
if (!(devmask & (1 << dev)))
|
|
continue;
|
|
if (!(adev = audio_devs[dev]))
|
|
continue;
|
|
if (adev->open_mode == 0)
|
|
continue;
|
|
if (adev->go)
|
|
continue;
|
|
/* OK to start the device */
|
|
adev->go = 1;
|
|
if (adev->d->trigger)
|
|
adev->d->trigger(dev,adev->enable_bits * adev->go);
|
|
}
|
|
}
|
|
/* via poll called without a lock ?*/
|
|
int DMAbuf_space_in_queue(int dev)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
int len, max, tmp;
|
|
struct dma_buffparms *dmap = adev->dmap_out;
|
|
int lim = dmap->nbufs;
|
|
|
|
if (lim < 2)
|
|
lim = 2;
|
|
|
|
if (dmap->qlen >= lim) /* No space at all */
|
|
return 0;
|
|
|
|
/*
|
|
* Verify that there are no more pending buffers than the limit
|
|
* defined by the process.
|
|
*/
|
|
|
|
max = dmap->max_fragments;
|
|
if (max > lim)
|
|
max = lim;
|
|
len = dmap->qlen;
|
|
|
|
if (adev->d->local_qlen) {
|
|
tmp = adev->d->local_qlen(dev);
|
|
if (tmp && len)
|
|
tmp--; /* This buffer has been counted twice */
|
|
len += tmp;
|
|
}
|
|
if (dmap->byte_counter % dmap->fragment_size) /* There is a partial fragment */
|
|
len = len + 1;
|
|
|
|
if (len >= max)
|
|
return 0;
|
|
return max - len;
|
|
}
|
|
/* MUST not hold the spinlock - this function may sleep */
|
|
static int output_sleep(int dev, int dontblock)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
int err = 0;
|
|
struct dma_buffparms *dmap = adev->dmap_out;
|
|
long timeout;
|
|
long timeout_value;
|
|
|
|
if (dontblock)
|
|
return -EAGAIN;
|
|
if (!(adev->enable_bits & PCM_ENABLE_OUTPUT))
|
|
return -EAGAIN;
|
|
|
|
/*
|
|
* Wait for free space
|
|
*/
|
|
if (signal_pending(current))
|
|
return -EINTR;
|
|
timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT));
|
|
if (timeout)
|
|
timeout_value = dmabuf_timeout(dmap);
|
|
else
|
|
timeout_value = MAX_SCHEDULE_TIMEOUT;
|
|
timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper,
|
|
timeout_value);
|
|
if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) {
|
|
printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n");
|
|
dma_reset_output(dev);
|
|
} else {
|
|
if (signal_pending(current))
|
|
err = -EINTR;
|
|
}
|
|
return err;
|
|
}
|
|
/* called with the lock held */
|
|
static int find_output_space(int dev, char **buf, int *size)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = adev->dmap_out;
|
|
unsigned long active_offs;
|
|
long len, offs;
|
|
int maxfrags;
|
|
int occupied_bytes = (dmap->user_counter % dmap->fragment_size);
|
|
|
|
*buf = dmap->raw_buf;
|
|
if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes)
|
|
return 0;
|
|
|
|
#ifdef BE_CONSERVATIVE
|
|
active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size;
|
|
#else
|
|
active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT);
|
|
/* Check for pointer wrapping situation */
|
|
if (active_offs < 0 || active_offs >= dmap->bytes_in_use)
|
|
active_offs = 0;
|
|
active_offs += dmap->byte_counter;
|
|
#endif
|
|
|
|
offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP;
|
|
if (offs < 0 || offs >= dmap->bytes_in_use) {
|
|
printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs);
|
|
printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use);
|
|
return 0;
|
|
}
|
|
*buf = dmap->raw_buf + offs;
|
|
|
|
len = active_offs + dmap->bytes_in_use - dmap->user_counter; /* Number of unused bytes in buffer */
|
|
|
|
if ((offs + len) > dmap->bytes_in_use)
|
|
len = dmap->bytes_in_use - offs;
|
|
if (len < 0) {
|
|
return 0;
|
|
}
|
|
if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes))
|
|
len = (maxfrags * dmap->fragment_size) - occupied_bytes;
|
|
*size = len & ~SAMPLE_ROUNDUP;
|
|
return (*size > 0);
|
|
}
|
|
/* aquires lock */
|
|
int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
unsigned long flags;
|
|
int err = -EIO;
|
|
struct dma_buffparms *dmap = adev->dmap_out;
|
|
|
|
if (dmap->mapping_flags & DMA_MAP_MAPPED) {
|
|
/* printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/
|
|
return -EINVAL;
|
|
}
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
if (dmap->needs_reorg)
|
|
reorganize_buffers(dev, dmap, 0);
|
|
|
|
if (dmap->dma_mode == DMODE_INPUT) { /* Direction change */
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
DMAbuf_reset(dev);
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
}
|
|
dmap->dma_mode = DMODE_OUTPUT;
|
|
|
|
while (find_output_space(dev, buf, size) <= 0) {
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
if ((err = output_sleep(dev, dontblock)) < 0) {
|
|
return err;
|
|
}
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
return 0;
|
|
}
|
|
/* has to aquire dmap->lock */
|
|
int DMAbuf_move_wrpointer(int dev, int l)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = adev->dmap_out;
|
|
unsigned long ptr;
|
|
unsigned long end_ptr, p;
|
|
int post;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
post= (dmap->flags & DMA_POST);
|
|
ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
|
|
|
|
dmap->flags &= ~DMA_POST;
|
|
dmap->cfrag = -1;
|
|
dmap->user_counter += l;
|
|
dmap->flags |= DMA_DIRTY;
|
|
|
|
if (dmap->byte_counter >= dmap->max_byte_counter) {
|
|
/* Wrap the byte counters */
|
|
long decr = dmap->byte_counter;
|
|
dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
|
|
decr -= dmap->byte_counter;
|
|
dmap->user_counter -= decr;
|
|
}
|
|
end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
|
|
|
|
p = (dmap->user_counter - 1) % dmap->bytes_in_use;
|
|
dmap->neutral_byte = dmap->raw_buf[p];
|
|
|
|
/* Update the fragment based bookkeeping too */
|
|
while (ptr < end_ptr) {
|
|
dmap->counts[dmap->qtail] = dmap->fragment_size;
|
|
dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
|
|
dmap->qlen++;
|
|
ptr += dmap->fragment_size;
|
|
}
|
|
|
|
dmap->counts[dmap->qtail] = dmap->user_counter - ptr;
|
|
|
|
/*
|
|
* Let the low level driver perform some postprocessing to
|
|
* the written data.
|
|
*/
|
|
if (adev->d->postprocess_write)
|
|
adev->d->postprocess_write(dev);
|
|
|
|
if (!(dmap->flags & DMA_ACTIVE))
|
|
if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1)))
|
|
DMAbuf_launch_output(dev, dmap);
|
|
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
return 0;
|
|
}
|
|
|
|
int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
|
|
|
|
if (dmap->raw_buf == NULL) {
|
|
printk(KERN_ERR "sound: DMA buffer(1) == NULL\n");
|
|
printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in");
|
|
return 0;
|
|
}
|
|
if (dmap->dma < 0)
|
|
return 0;
|
|
sound_start_dma(dmap, physaddr, count, dma_mode);
|
|
return count;
|
|
}
|
|
|
|
static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode)
|
|
{
|
|
struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
|
|
|
|
if (dmap->raw_buf == NULL) {
|
|
printk(KERN_ERR "sound: DMA buffer(2) == NULL\n");
|
|
printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in");
|
|
return 0;
|
|
}
|
|
if (dmap->flags & DMA_NODMA)
|
|
return 1;
|
|
if (dmap->dma < 0)
|
|
return 0;
|
|
sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT);
|
|
dmap->flags |= DMA_STARTED;
|
|
return count;
|
|
}
|
|
|
|
static void finish_output_interrupt(int dev, struct dma_buffparms *dmap)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
|
|
if (dmap->audio_callback != NULL)
|
|
dmap->audio_callback(dev, dmap->callback_parm);
|
|
wake_up(&adev->out_sleeper);
|
|
wake_up(&adev->poll_sleeper);
|
|
}
|
|
/* called with dmap->lock held in irq context*/
|
|
static void do_outputintr(int dev, int dummy)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = adev->dmap_out;
|
|
int this_fragment;
|
|
|
|
if (dmap->raw_buf == NULL) {
|
|
printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev);
|
|
return;
|
|
}
|
|
if (dmap->mapping_flags & DMA_MAP_MAPPED) { /* Virtual memory mapped access */
|
|
/* mmapped access */
|
|
dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
|
|
if (dmap->qhead == 0) { /* Wrapped */
|
|
dmap->byte_counter += dmap->bytes_in_use;
|
|
if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
|
|
long decr = dmap->byte_counter;
|
|
dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
|
|
decr -= dmap->byte_counter;
|
|
dmap->user_counter -= decr;
|
|
}
|
|
}
|
|
dmap->qlen++; /* Yes increment it (don't decrement) */
|
|
if (!(adev->flags & DMA_AUTOMODE))
|
|
dmap->flags &= ~DMA_ACTIVE;
|
|
dmap->counts[dmap->qhead] = dmap->fragment_size;
|
|
DMAbuf_launch_output(dev, dmap);
|
|
finish_output_interrupt(dev, dmap);
|
|
return;
|
|
}
|
|
|
|
dmap->qlen--;
|
|
this_fragment = dmap->qhead;
|
|
dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
|
|
|
|
if (dmap->qhead == 0) { /* Wrapped */
|
|
dmap->byte_counter += dmap->bytes_in_use;
|
|
if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
|
|
long decr = dmap->byte_counter;
|
|
dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
|
|
decr -= dmap->byte_counter;
|
|
dmap->user_counter -= decr;
|
|
}
|
|
}
|
|
if (!(adev->flags & DMA_AUTOMODE))
|
|
dmap->flags &= ~DMA_ACTIVE;
|
|
|
|
/*
|
|
* This is dmap->qlen <= 0 except when closing when
|
|
* dmap->qlen < 0
|
|
*/
|
|
|
|
while (dmap->qlen <= -dmap->closing) {
|
|
dmap->underrun_count++;
|
|
dmap->qlen++;
|
|
if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) {
|
|
dmap->flags &= ~DMA_DIRTY;
|
|
memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
|
|
adev->dmap_out->buffsize);
|
|
}
|
|
dmap->user_counter += dmap->fragment_size;
|
|
dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
|
|
}
|
|
if (dmap->qlen > 0)
|
|
DMAbuf_launch_output(dev, dmap);
|
|
finish_output_interrupt(dev, dmap);
|
|
}
|
|
/* called in irq context */
|
|
void DMAbuf_outputintr(int dev, int notify_only)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
unsigned long flags;
|
|
struct dma_buffparms *dmap = adev->dmap_out;
|
|
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
if (!(dmap->flags & DMA_NODMA)) {
|
|
int chan = dmap->dma, pos, n;
|
|
unsigned long f;
|
|
|
|
f=claim_dma_lock();
|
|
|
|
if(!isa_dma_bridge_buggy)
|
|
disable_dma(dmap->dma);
|
|
clear_dma_ff(chan);
|
|
pos = dmap->bytes_in_use - get_dma_residue(chan);
|
|
if(!isa_dma_bridge_buggy)
|
|
enable_dma(dmap->dma);
|
|
release_dma_lock(f);
|
|
|
|
pos = pos / dmap->fragment_size; /* Actual qhead */
|
|
if (pos < 0 || pos >= dmap->nbufs)
|
|
pos = 0;
|
|
n = 0;
|
|
while (dmap->qhead != pos && n++ < dmap->nbufs)
|
|
do_outputintr(dev, notify_only);
|
|
}
|
|
else
|
|
do_outputintr(dev, notify_only);
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
}
|
|
/* called with dmap->lock held in irq context */
|
|
static void do_inputintr(int dev)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = adev->dmap_in;
|
|
|
|
if (dmap->raw_buf == NULL) {
|
|
printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n");
|
|
return;
|
|
}
|
|
if (dmap->mapping_flags & DMA_MAP_MAPPED) {
|
|
dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
|
|
if (dmap->qtail == 0) { /* Wrapped */
|
|
dmap->byte_counter += dmap->bytes_in_use;
|
|
if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
|
|
long decr = dmap->byte_counter;
|
|
dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
|
|
decr -= dmap->byte_counter;
|
|
dmap->user_counter -= decr;
|
|
}
|
|
}
|
|
dmap->qlen++;
|
|
|
|
if (!(adev->flags & DMA_AUTOMODE)) {
|
|
if (dmap->needs_reorg)
|
|
reorganize_buffers(dev, dmap, 0);
|
|
local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ);
|
|
adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
|
|
dmap->fragment_size, 1);
|
|
if (adev->d->trigger)
|
|
adev->d->trigger(dev, adev->enable_bits * adev->go);
|
|
}
|
|
dmap->flags |= DMA_ACTIVE;
|
|
} else if (dmap->qlen >= (dmap->nbufs - 1)) {
|
|
printk(KERN_WARNING "Sound: Recording overrun\n");
|
|
dmap->underrun_count++;
|
|
|
|
/* Just throw away the oldest fragment but keep the engine running */
|
|
dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
|
|
dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
|
|
} else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) {
|
|
dmap->qlen++;
|
|
dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
|
|
if (dmap->qtail == 0) { /* Wrapped */
|
|
dmap->byte_counter += dmap->bytes_in_use;
|
|
if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
|
|
long decr = dmap->byte_counter;
|
|
dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
|
|
decr -= dmap->byte_counter;
|
|
dmap->user_counter -= decr;
|
|
}
|
|
}
|
|
}
|
|
if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
|
|
local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
|
|
adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1);
|
|
if (adev->d->trigger)
|
|
adev->d->trigger(dev,adev->enable_bits * adev->go);
|
|
}
|
|
dmap->flags |= DMA_ACTIVE;
|
|
if (dmap->qlen > 0)
|
|
{
|
|
wake_up(&adev->in_sleeper);
|
|
wake_up(&adev->poll_sleeper);
|
|
}
|
|
}
|
|
/* called in irq context */
|
|
void DMAbuf_inputintr(int dev)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = adev->dmap_in;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
|
|
if (!(dmap->flags & DMA_NODMA)) {
|
|
int chan = dmap->dma, pos, n;
|
|
unsigned long f;
|
|
|
|
f=claim_dma_lock();
|
|
if(!isa_dma_bridge_buggy)
|
|
disable_dma(dmap->dma);
|
|
clear_dma_ff(chan);
|
|
pos = dmap->bytes_in_use - get_dma_residue(chan);
|
|
if(!isa_dma_bridge_buggy)
|
|
enable_dma(dmap->dma);
|
|
release_dma_lock(f);
|
|
|
|
pos = pos / dmap->fragment_size; /* Actual qhead */
|
|
if (pos < 0 || pos >= dmap->nbufs)
|
|
pos = 0;
|
|
|
|
n = 0;
|
|
while (dmap->qtail != pos && ++n < dmap->nbufs)
|
|
do_inputintr(dev);
|
|
} else
|
|
do_inputintr(dev);
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
}
|
|
|
|
int DMAbuf_open_dma(int dev)
|
|
{
|
|
/*
|
|
* NOTE! This routine opens only the primary DMA channel (output).
|
|
*/
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
int err;
|
|
|
|
if ((err = open_dmap(adev, OPEN_READWRITE, adev->dmap_out)) < 0)
|
|
return -EBUSY;
|
|
dma_init_buffers(adev->dmap_out);
|
|
adev->dmap_out->flags |= DMA_ALLOC_DONE;
|
|
adev->dmap_out->fragment_size = adev->dmap_out->buffsize;
|
|
|
|
if (adev->dmap_out->dma >= 0) {
|
|
unsigned long flags;
|
|
|
|
flags=claim_dma_lock();
|
|
clear_dma_ff(adev->dmap_out->dma);
|
|
disable_dma(adev->dmap_out->dma);
|
|
release_dma_lock(flags);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void DMAbuf_close_dma(int dev)
|
|
{
|
|
close_dmap(audio_devs[dev], audio_devs[dev]->dmap_out);
|
|
}
|
|
|
|
void DMAbuf_init(int dev, int dma1, int dma2)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
/*
|
|
* NOTE! This routine could be called several times.
|
|
*/
|
|
|
|
/* drag in audio_syms.o */
|
|
{
|
|
extern char audio_syms_symbol;
|
|
audio_syms_symbol = 0;
|
|
}
|
|
|
|
if (adev && adev->dmap_out == NULL) {
|
|
if (adev->d == NULL)
|
|
panic("OSS: audio_devs[%d]->d == NULL\n", dev);
|
|
|
|
if (adev->parent_dev) { /* Use DMA map of the parent dev */
|
|
int parent = adev->parent_dev - 1;
|
|
adev->dmap_out = audio_devs[parent]->dmap_out;
|
|
adev->dmap_in = audio_devs[parent]->dmap_in;
|
|
} else {
|
|
adev->dmap_out = adev->dmap_in = &adev->dmaps[0];
|
|
adev->dmap_out->dma = dma1;
|
|
if (adev->flags & DMA_DUPLEX) {
|
|
adev->dmap_in = &adev->dmaps[1];
|
|
adev->dmap_in->dma = dma2;
|
|
}
|
|
}
|
|
/* Persistent DMA buffers allocated here */
|
|
if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
|
|
if (adev->dmap_in->raw_buf == NULL)
|
|
sound_alloc_dmap(adev->dmap_in);
|
|
if (adev->dmap_out->raw_buf == NULL)
|
|
sound_alloc_dmap(adev->dmap_out);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */
|
|
static unsigned int poll_input(struct file * file, int dev, poll_table *wait)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = adev->dmap_in;
|
|
|
|
if (!(adev->open_mode & OPEN_READ))
|
|
return 0;
|
|
if (dmap->mapping_flags & DMA_MAP_MAPPED) {
|
|
if (dmap->qlen)
|
|
return POLLIN | POLLRDNORM;
|
|
return 0;
|
|
}
|
|
if (dmap->dma_mode != DMODE_INPUT) {
|
|
if (dmap->dma_mode == DMODE_NONE &&
|
|
adev->enable_bits & PCM_ENABLE_INPUT &&
|
|
!dmap->qlen && adev->go) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dmap->lock,flags);
|
|
DMAbuf_activate_recording(dev, dmap);
|
|
spin_unlock_irqrestore(&dmap->lock,flags);
|
|
}
|
|
return 0;
|
|
}
|
|
if (!dmap->qlen)
|
|
return 0;
|
|
return POLLIN | POLLRDNORM;
|
|
}
|
|
|
|
static unsigned int poll_output(struct file * file, int dev, poll_table *wait)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
struct dma_buffparms *dmap = adev->dmap_out;
|
|
|
|
if (!(adev->open_mode & OPEN_WRITE))
|
|
return 0;
|
|
if (dmap->mapping_flags & DMA_MAP_MAPPED) {
|
|
if (dmap->qlen)
|
|
return POLLOUT | POLLWRNORM;
|
|
return 0;
|
|
}
|
|
if (dmap->dma_mode == DMODE_INPUT)
|
|
return 0;
|
|
if (dmap->dma_mode == DMODE_NONE)
|
|
return POLLOUT | POLLWRNORM;
|
|
if (!DMAbuf_space_in_queue(dev))
|
|
return 0;
|
|
return POLLOUT | POLLWRNORM;
|
|
}
|
|
|
|
unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
poll_wait(file, &adev->poll_sleeper, wait);
|
|
return poll_input(file, dev, wait) | poll_output(file, dev, wait);
|
|
}
|
|
|
|
void DMAbuf_deinit(int dev)
|
|
{
|
|
struct audio_operations *adev = audio_devs[dev];
|
|
/* This routine is called when driver is being unloaded */
|
|
if (!adev)
|
|
return;
|
|
|
|
/* Persistent DMA buffers deallocated here */
|
|
if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
|
|
sound_free_dmap(adev->dmap_out);
|
|
if (adev->flags & DMA_DUPLEX)
|
|
sound_free_dmap(adev->dmap_in);
|
|
}
|
|
}
|