1a46116d9d
available in buffer when buffer was completely empty. It now correctly reports the total buffer space available. Reviewed by: jkh, davidg Obtained from: Linux 1.3.20's sound driver code
1154 lines
25 KiB
C
1154 lines
25 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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* Copyright by Hannu Savolainen 1993, 1994, 1995
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <i386/isa/sound/sound_config.h>
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#ifdef CONFIGURE_SOUNDCARD
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#if !defined(EXCLUDE_AUDIO) || !defined(EXCLUDE_GUS)
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DEFINE_WAIT_QUEUES (dev_sleeper[MAX_AUDIO_DEV], dev_sleep_flag[MAX_AUDIO_DEV]);
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static struct dma_buffparms dmaps[MAX_AUDIO_DEV] =
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{
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{0}}; /*
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* Primitive way to allocate
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* such a large array.
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* Needs dynamic run-time alloction.
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*/
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static int space_in_queue (int);
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static void reorganize_buffers (int);
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static void dma_init_buffers (int);
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static void
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reorganize_buffers (int dev)
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{
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/*
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* This routine breaks the physical device buffers to logical ones.
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*/
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struct dma_buffparms *dmap = audio_devs[dev]->dmap;
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struct audio_operations *dsp_dev = audio_devs[dev];
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unsigned i, p, n;
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unsigned sr, nc, sz, bsz;
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if (dmap->fragment_size == 0)
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{ /* Compute the fragment size using the default algorithm */
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sr = dsp_dev->ioctl (dev, SOUND_PCM_READ_RATE, 0, 1);
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nc = dsp_dev->ioctl (dev, SOUND_PCM_READ_CHANNELS, 0, 1);
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sz = dsp_dev->ioctl (dev, SOUND_PCM_READ_BITS, 0, 1);
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if (sr < 1 || nc < 1 || sz < 1)
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{
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printk ("Warning: Invalid PCM parameters[%d] sr=%d, nc=%d, sz=%d\n",
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dev, sr, nc, sz);
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sr = DSP_DEFAULT_SPEED;
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nc = 1;
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sz = 8;
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}
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sz = sr * nc * sz;
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sz /= 8; /* #bits -> #bytes */
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/*
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* Compute a buffer size for time not exeeding 1 second.
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* Usually this algorithm gives a buffer size for 0.5 to 1.0 seconds
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* of sound (using the current speed, sample size and #channels).
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*/
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bsz = dsp_dev->buffsize;
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while (bsz > sz)
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bsz /= 2;
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if (dsp_dev->buffcount == 1 && bsz == dsp_dev->buffsize)
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bsz /= 2; /* Needs at least 2 buffers */
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if (dmap->subdivision == 0) /* Not already set */
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dmap->subdivision = 1; /* Init to default value */
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else
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bsz /= dmap->subdivision;
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if (bsz < 16)
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bsz = 16; /* Just a sanity check */
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while ((dsp_dev->buffsize * dsp_dev->buffcount) / bsz > MAX_SUB_BUFFERS)
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bsz *= 2;
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dmap->fragment_size = bsz;
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}
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else
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{
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/*
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* The process has specified the buffer sice with SNDCTL_DSP_SETFRAGMENT or
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* the buffer sice computation has already been done.
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*/
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if (dmap->fragment_size > (audio_devs[dev]->buffsize / 2))
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dmap->fragment_size = (audio_devs[dev]->buffsize / 2);
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bsz = dmap->fragment_size;
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}
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bsz &= ~0x03; /* Force size which is multiple of 4 bytes */
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/*
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* Now computing addresses for the logical buffers
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*/
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n = 0;
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for (i = 0; i < dmap->raw_count &&
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n < dmap->max_fragments &&
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n < MAX_SUB_BUFFERS; i++)
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{
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p = 0;
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while ((p + bsz) <= dsp_dev->buffsize &&
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n < dmap->max_fragments &&
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n < MAX_SUB_BUFFERS)
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{
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dmap->buf[n] = dmap->raw_buf[i] + p;
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dmap->buf_phys[n] = dmap->raw_buf_phys[i] + p;
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p += bsz;
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n++;
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}
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}
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dmap->nbufs = n;
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dmap->bytes_in_use = n * bsz;
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for (i = 0; i < dmap->nbufs; i++)
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{
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dmap->counts[i] = 0;
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}
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dmap->flags |= DMA_ALLOC_DONE;
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}
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static void
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dma_init_buffers (int dev)
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{
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struct dma_buffparms *dmap = audio_devs[dev]->dmap = &dmaps[dev];
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RESET_WAIT_QUEUE (dev_sleeper[dev], dev_sleep_flag[dev]);
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dmap->flags = DMA_BUSY; /* Other flags off */
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dmap->qlen = dmap->qhead = dmap->qtail = 0;
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dmap->nbufs = 1;
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dmap->bytes_in_use = audio_devs[dev]->buffsize;
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dmap->dma_mode = DMODE_NONE;
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}
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int
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DMAbuf_open (int dev, int mode)
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{
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int retval;
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struct dma_buffparms *dmap = NULL;
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if (dev >= num_audiodevs)
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{
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printk ("PCM device %d not installed.\n", dev);
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return RET_ERROR (ENXIO);
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}
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if (!audio_devs[dev])
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{
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printk ("PCM device %d not initialized\n", dev);
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return RET_ERROR (ENXIO);
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}
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dmap = audio_devs[dev]->dmap = &dmaps[dev];
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if (dmap->flags & DMA_BUSY)
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return RET_ERROR (EBUSY);
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#ifdef USE_RUNTIME_DMAMEM
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dmap->raw_buf[0] = NULL;
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sound_dma_malloc (dev);
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#endif
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if (dmap->raw_buf[0] == NULL)
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return RET_ERROR (ENOSPC); /* Memory allocation failed during boot */
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if ((retval = audio_devs[dev]->open (dev, mode)) < 0)
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return retval;
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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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dma_init_buffers (dev);
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audio_devs[dev]->ioctl (dev, SOUND_PCM_WRITE_BITS, 8, 1);
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audio_devs[dev]->ioctl (dev, SOUND_PCM_WRITE_CHANNELS, 1, 1);
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audio_devs[dev]->ioctl (dev, SOUND_PCM_WRITE_RATE, DSP_DEFAULT_SPEED, 1);
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return 0;
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}
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static void
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dma_reset (int dev)
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{
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int retval;
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unsigned long flags;
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DISABLE_INTR (flags);
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audio_devs[dev]->reset (dev);
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audio_devs[dev]->close (dev);
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if ((retval = audio_devs[dev]->open (dev, audio_devs[dev]->dmap->open_mode)) < 0)
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printk ("Sound: Reset failed - Can't reopen device\n");
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RESTORE_INTR (flags);
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dma_init_buffers (dev);
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reorganize_buffers (dev);
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}
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static int
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dma_sync (int dev)
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{
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unsigned long flags;
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if (audio_devs[dev]->dmap->dma_mode == DMODE_OUTPUT)
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{
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DISABLE_INTR (flags);
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while (!PROCESS_ABORTING (dev_sleeper[dev], dev_sleep_flag[dev])
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&& audio_devs[dev]->dmap->qlen)
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{
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DO_SLEEP (dev_sleeper[dev], dev_sleep_flag[dev], 10 * HZ);
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if (TIMED_OUT (dev_sleeper[dev], dev_sleep_flag[dev]))
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{
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RESTORE_INTR (flags);
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return audio_devs[dev]->dmap->qlen;
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}
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}
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RESTORE_INTR (flags);
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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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DISABLE_INTR (flags);
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if (audio_devs[dev]->local_qlen) /* Device has hidden buffers */
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{
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while (!(PROCESS_ABORTING (dev_sleeper[dev], dev_sleep_flag[dev]))
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&& audio_devs[dev]->local_qlen (dev))
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{
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DO_SLEEP (dev_sleeper[dev], dev_sleep_flag[dev], HZ);
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}
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}
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RESTORE_INTR (flags);
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}
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return audio_devs[dev]->dmap->qlen;
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}
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int
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DMAbuf_release (int dev, int mode)
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{
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unsigned long flags;
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if (!(PROCESS_ABORTING (dev_sleeper[dev], dev_sleep_flag[dev]))
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&& (audio_devs[dev]->dmap->dma_mode == DMODE_OUTPUT))
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{
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dma_sync (dev);
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}
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#ifdef USE_RUNTIME_DMAMEM
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sound_dma_free (dev);
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#endif
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DISABLE_INTR (flags);
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audio_devs[dev]->reset (dev);
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audio_devs[dev]->close (dev);
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audio_devs[dev]->dmap->dma_mode = DMODE_NONE;
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audio_devs[dev]->dmap->flags &= ~DMA_BUSY;
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RESTORE_INTR (flags);
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return 0;
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}
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int
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DMAbuf_getrdbuffer (int dev, char **buf, int *len, int dontblock)
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{
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unsigned long flags;
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int err = EIO;
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struct dma_buffparms *dmap = audio_devs[dev]->dmap;
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DISABLE_INTR (flags);
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if (!dmap->qlen)
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{
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if (dmap->flags & DMA_RESTART)
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{
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dma_reset (dev);
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dmap->flags &= ~DMA_RESTART;
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}
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if (dmap->dma_mode == DMODE_OUTPUT) /* Direction change */
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{
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dma_sync (dev);
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dma_reset (dev);
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dmap->dma_mode = DMODE_NONE;
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}
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if (!(dmap->flags & DMA_ALLOC_DONE))
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reorganize_buffers (dev);
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if (!dmap->dma_mode)
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{
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int err;
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if ((err = audio_devs[dev]->prepare_for_input (dev,
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dmap->fragment_size, dmap->nbufs)) < 0)
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{
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RESTORE_INTR (flags);
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return err;
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}
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dmap->dma_mode = DMODE_INPUT;
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}
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if (!(dmap->flags & DMA_ACTIVE))
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{
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audio_devs[dev]->start_input (dev, dmap->buf_phys[dmap->qtail],
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dmap->fragment_size, 0,
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!(audio_devs[dev]->flags & DMA_AUTOMODE) ||
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!(dmap->flags & DMA_STARTED));
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dmap->flags |= DMA_ACTIVE | DMA_STARTED;
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}
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if (dontblock)
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{
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RESTORE_INTR (flags);
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#if defined(__FreeBSD__)
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return RET_ERROR (EWOULDBLOCK);
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#else
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return RET_ERROR (EAGAIN);
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#endif
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}
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/* Wait for the next block */
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DO_SLEEP (dev_sleeper[dev], dev_sleep_flag[dev], 2 * HZ);
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if (TIMED_OUT (dev_sleeper[dev], dev_sleep_flag[dev]))
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{
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printk ("Sound: DMA timed out - IRQ/DRQ config error?\n");
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dma_reset (dev);
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err = EIO;
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SET_ABORT_FLAG (dev_sleeper[dev], dev_sleep_flag[dev]);
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}
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else
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err = EINTR;
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}
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RESTORE_INTR (flags);
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if (!dmap->qlen)
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return RET_ERROR (err);
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*buf = &dmap->buf[dmap->qhead][dmap->counts[dmap->qhead]];
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*len = dmap->fragment_size - dmap->counts[dmap->qhead];
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return dmap->qhead;
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}
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int
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DMAbuf_rmchars (int dev, int buff_no, int c)
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{
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struct dma_buffparms *dmap = audio_devs[dev]->dmap;
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int p = dmap->counts[dmap->qhead] + c;
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if (p >= dmap->fragment_size)
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{ /* This buffer is completely empty */
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dmap->counts[dmap->qhead] = 0;
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if (dmap->qlen <= 0 || dmap->qlen > dmap->nbufs)
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printk ("\nSound: Audio queue1 corrupted for dev%d (%d/%d)\n",
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dev, dmap->qlen, dmap->nbufs);
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dmap->qlen--;
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dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
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}
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else
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dmap->counts[dmap->qhead] = p;
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return 0;
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}
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int
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DMAbuf_ioctl (int dev, unsigned int cmd, unsigned int arg, int local)
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{
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struct dma_buffparms *dmap = audio_devs[dev]->dmap;
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switch (cmd)
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{
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case SNDCTL_DSP_RESET:
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dma_reset (dev);
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return 0;
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break;
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case SNDCTL_DSP_SYNC:
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dma_sync (dev);
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dma_reset (dev);
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return 0;
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break;
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case SNDCTL_DSP_GETBLKSIZE:
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if (!(dmap->flags & DMA_ALLOC_DONE))
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reorganize_buffers (dev);
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return IOCTL_OUT (arg, dmap->fragment_size);
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break;
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case SNDCTL_DSP_SETBLKSIZE:
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{
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int size = IOCTL_IN(arg);
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if(!(dmap->flags & DMA_ALLOC_DONE) && size)
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{
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dmap->fragment_size = size;
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return 0;
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}
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else
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return RET_ERROR (EINVAL); /* Too late to change */
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}
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break;
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case SNDCTL_DSP_SUBDIVIDE:
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{
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int fact = IOCTL_IN (arg);
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if (fact == 0)
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{
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fact = dmap->subdivision;
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if (fact == 0)
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fact = 1;
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return IOCTL_OUT (arg, fact);
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}
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if (dmap->subdivision != 0 ||
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dmap->fragment_size) /* Loo late to change */
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return RET_ERROR (EINVAL);
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if (fact > MAX_REALTIME_FACTOR)
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return RET_ERROR (EINVAL);
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if (fact != 1 && fact != 2 && fact != 4 && fact != 8 && fact != 16)
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return RET_ERROR (EINVAL);
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dmap->subdivision = fact;
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return IOCTL_OUT (arg, fact);
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}
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break;
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case SNDCTL_DSP_SETFRAGMENT:
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{
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int fact = IOCTL_IN (arg);
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int bytes, count;
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if (fact == 0)
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return RET_ERROR (EIO);
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if (dmap->subdivision != 0 ||
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dmap->fragment_size) /* Loo late to change */
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return RET_ERROR (EINVAL);
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bytes = fact & 0xffff;
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count = (fact >> 16) & 0xffff;
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if (count == 0)
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count = MAX_SUB_BUFFERS;
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if (bytes < 7 || bytes > 17) /* <64 || > 128k */
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return RET_ERROR (EINVAL);
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if (count < 2)
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return RET_ERROR (EINVAL);
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dmap->fragment_size = (1 << bytes);
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dmap->max_fragments = count;
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if (dmap->fragment_size > audio_devs[dev]->buffsize)
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dmap->fragment_size = audio_devs[dev]->buffsize;
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if (dmap->fragment_size == audio_devs[dev]->buffsize &&
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audio_devs[dev]->flags & DMA_AUTOMODE)
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dmap->fragment_size /= 2; /* Needs at least 2 buffers */
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dmap->subdivision = 1; /* Disable SNDCTL_DSP_SUBDIVIDE */
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return IOCTL_OUT (arg, bytes | (count << 16));
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}
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break;
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case SNDCTL_DSP_GETISPACE:
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case SNDCTL_DSP_GETOSPACE:
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if (!local)
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return RET_ERROR (EINVAL);
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else
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{
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audio_buf_info *info = (audio_buf_info *) arg;
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|
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if (!(dmap->flags & DMA_ALLOC_DONE))
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reorganize_buffers (dev);
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info->fragstotal = dmap->nbufs;
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if (cmd == SNDCTL_DSP_GETISPACE)
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info->fragments = dmap->qlen;
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else
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{
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if (!space_in_queue (dev))
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info->fragments = 0;
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else
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{
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info->fragments = dmap->nbufs - dmap->qlen;
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if (audio_devs[dev]->local_qlen)
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{
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int tmp = audio_devs[dev]->local_qlen (dev);
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|
|
if (tmp & info->fragments)
|
|
tmp--; /*
|
|
* This buffer has been counted twice
|
|
*/
|
|
info->fragments -= tmp;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (info->fragments < 0)
|
|
info->fragments = 0;
|
|
else if (info->fragments > dmap->nbufs)
|
|
info->fragments = dmap->nbufs;
|
|
|
|
info->fragsize = dmap->fragment_size;
|
|
info->bytes = info->fragments * dmap->fragment_size;
|
|
|
|
if (cmd == SNDCTL_DSP_GETISPACE && dmap->qlen)
|
|
info->bytes -= dmap->counts[dmap->qhead];
|
|
}
|
|
return 0;
|
|
|
|
default:
|
|
return audio_devs[dev]->ioctl (dev, cmd, arg, local);
|
|
}
|
|
|
|
}
|
|
|
|
static int
|
|
space_in_queue (int dev)
|
|
{
|
|
int len, max, tmp;
|
|
struct dma_buffparms *dmap = audio_devs[dev]->dmap;
|
|
|
|
if (dmap->qlen >= dmap->nbufs) /* 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;
|
|
len = dmap->qlen;
|
|
|
|
if (audio_devs[dev]->local_qlen)
|
|
{
|
|
tmp = audio_devs[dev]->local_qlen (dev);
|
|
if (tmp & len)
|
|
tmp--; /*
|
|
* This buffer has been counted twice
|
|
*/
|
|
len += tmp;
|
|
}
|
|
|
|
if (len >= max)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
DMAbuf_getwrbuffer (int dev, char **buf, int *size, int dontblock)
|
|
{
|
|
unsigned long flags;
|
|
int abort, err = EIO;
|
|
struct dma_buffparms *dmap = audio_devs[dev]->dmap;
|
|
|
|
if (dmap->dma_mode == DMODE_INPUT) /* Direction change */
|
|
{
|
|
dma_reset (dev);
|
|
dmap->dma_mode = DMODE_NONE;
|
|
}
|
|
else if (dmap->flags & DMA_RESTART) /* Restart buffering */
|
|
{
|
|
dma_sync (dev);
|
|
dma_reset (dev);
|
|
}
|
|
|
|
dmap->flags &= ~DMA_RESTART;
|
|
|
|
if (!(dmap->flags & DMA_ALLOC_DONE))
|
|
reorganize_buffers (dev);
|
|
|
|
if (!dmap->dma_mode)
|
|
{
|
|
int err;
|
|
|
|
dmap->dma_mode = DMODE_OUTPUT;
|
|
if ((err = audio_devs[dev]->prepare_for_output (dev,
|
|
dmap->fragment_size, dmap->nbufs)) < 0)
|
|
return err;
|
|
}
|
|
|
|
DISABLE_INTR (flags);
|
|
|
|
abort = 0;
|
|
while (!space_in_queue (dev) &&
|
|
!abort)
|
|
{
|
|
|
|
if (dontblock)
|
|
{
|
|
RESTORE_INTR (flags);
|
|
return RET_ERROR (EAGAIN);
|
|
}
|
|
|
|
/*
|
|
* Wait for free space
|
|
*/
|
|
DO_SLEEP (dev_sleeper[dev], dev_sleep_flag[dev], 2 * HZ);
|
|
if (TIMED_OUT (dev_sleeper[dev], dev_sleep_flag[dev]))
|
|
{
|
|
printk ("Sound: DMA timed out - IRQ/DRQ config error?\n");
|
|
dma_reset (dev);
|
|
err = EIO;
|
|
abort = 1;
|
|
SET_ABORT_FLAG (dev_sleeper[dev], dev_sleep_flag[dev]);
|
|
}
|
|
else if (PROCESS_ABORTING (dev_sleeper[dev], dev_sleep_flag[dev]))
|
|
{
|
|
err = EINTR;
|
|
abort = 1;
|
|
}
|
|
}
|
|
RESTORE_INTR (flags);
|
|
|
|
if (!space_in_queue (dev))
|
|
{
|
|
return RET_ERROR (err); /* Caught a signal ? */
|
|
}
|
|
|
|
*buf = dmap->buf[dmap->qtail];
|
|
*size = dmap->fragment_size;
|
|
dmap->counts[dmap->qtail] = 0;
|
|
|
|
return dmap->qtail;
|
|
}
|
|
|
|
int
|
|
DMAbuf_start_output (int dev, int buff_no, int l)
|
|
{
|
|
struct dma_buffparms *dmap = audio_devs[dev]->dmap;
|
|
|
|
if (buff_no != dmap->qtail)
|
|
printk ("Sound warning: DMA buffers out of sync %d != %d\n", buff_no, dmap->qtail);
|
|
|
|
dmap->qlen++;
|
|
if (dmap->qlen <= 0 || dmap->qlen > dmap->nbufs)
|
|
printk ("\nSound: Audio queue2 corrupted for dev%d (%d/%d)\n",
|
|
dev, dmap->qlen, dmap->nbufs);
|
|
|
|
dmap->counts[dmap->qtail] = l;
|
|
|
|
if ((l != dmap->fragment_size) &&
|
|
((audio_devs[dev]->flags & DMA_AUTOMODE) &&
|
|
audio_devs[dev]->flags & NEEDS_RESTART))
|
|
dmap->flags |= DMA_RESTART;
|
|
else
|
|
dmap->flags &= ~DMA_RESTART;
|
|
|
|
dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
|
|
|
|
if (!(dmap->flags & DMA_ACTIVE))
|
|
{
|
|
dmap->flags |= DMA_ACTIVE;
|
|
audio_devs[dev]->output_block (dev, dmap->buf_phys[dmap->qhead],
|
|
dmap->counts[dmap->qhead], 0,
|
|
!(audio_devs[dev]->flags & DMA_AUTOMODE) ||
|
|
!(dmap->flags & DMA_STARTED));
|
|
dmap->flags |= DMA_STARTED;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
DMAbuf_start_dma (int dev, unsigned long physaddr, int count, int dma_mode)
|
|
{
|
|
int chan = audio_devs[dev]->dmachan;
|
|
struct dma_buffparms *dmap = audio_devs[dev]->dmap;
|
|
#ifdef linux
|
|
unsigned long flags;
|
|
#endif
|
|
/*
|
|
* This function is not as portable as it should be.
|
|
*/
|
|
|
|
/*
|
|
* The count must be one less than the actual size. This is handled by
|
|
* set_dma_addr()
|
|
*/
|
|
|
|
if (audio_devs[dev]->flags & DMA_AUTOMODE)
|
|
{ /*
|
|
* Auto restart mode. Transfer the whole *
|
|
* buffer
|
|
*/
|
|
#ifdef linux
|
|
DISABLE_INTR (flags);
|
|
disable_dma (chan);
|
|
clear_dma_ff (chan);
|
|
set_dma_mode (chan, dma_mode | DMA_AUTOINIT);
|
|
set_dma_addr (chan, dmap->raw_buf_phys[0]);
|
|
set_dma_count (chan, dmap->bytes_in_use);
|
|
enable_dma (chan);
|
|
RESTORE_INTR (flags);
|
|
#else
|
|
|
|
#if defined(__FreeBSD__)
|
|
|
|
isa_dmastart (B_RAW | ((dma_mode == DMA_MODE_READ) ? B_READ : B_WRITE),
|
|
(caddr_t)dmap->raw_buf_phys[0],
|
|
dmap->bytes_in_use,
|
|
chan);
|
|
#else /* else __FreeBSD__ */
|
|
#if defined(GENERIC_SYSV)
|
|
#ifndef DMAMODE_AUTO
|
|
printk ("sound: Invalid DMA mode for device %d\n", dev);
|
|
#endif
|
|
#if defined(SVR42)
|
|
|
|
/*
|
|
** send full count to snd_dma_prog, it will take care of subtracting
|
|
** one if it is required.
|
|
*/
|
|
snd_dma_prog (chan, dmap->raw_buf_phys[0], dmap->bytes_in_use,
|
|
dma_mode, TRUE);
|
|
|
|
#else /* !SVR42 */
|
|
dma_param (chan, ((dma_mode == DMA_MODE_READ) ? DMA_Rdmode : DMA_Wrmode)
|
|
#ifdef DMAMODE_AUTO
|
|
| DMAMODE_AUTO
|
|
#endif
|
|
,
|
|
dmap->raw_buf_phys[0], dmap->bytes_in_use - 1);
|
|
dma_enable (chan);
|
|
#endif /* ! SVR42 */
|
|
#else
|
|
#error This routine is not valid for this OS.
|
|
#endif
|
|
#endif
|
|
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
#ifdef linux
|
|
DISABLE_INTR (flags);
|
|
disable_dma (chan);
|
|
clear_dma_ff (chan);
|
|
set_dma_mode (chan, dma_mode);
|
|
set_dma_addr (chan, physaddr);
|
|
set_dma_count (chan, count);
|
|
enable_dma (chan);
|
|
RESTORE_INTR (flags);
|
|
#else
|
|
#if defined(__FreeBSD__)
|
|
isa_dmastart ((dma_mode == DMA_MODE_READ) ? B_READ : B_WRITE,
|
|
(caddr_t)physaddr,
|
|
count,
|
|
chan);
|
|
#else /* FreeBSD */
|
|
|
|
#if defined(GENERIC_SYSV)
|
|
#if defined(SVR42)
|
|
|
|
snd_dma_prog (chan, physaddr, count, dma_mode, FALSE);
|
|
|
|
#else /* ! SVR42 */
|
|
dma_param (chan, ((dma_mode == DMA_MODE_READ) ? DMA_Rdmode : DMA_Wrmode),
|
|
physaddr, count);
|
|
dma_enable (chan);
|
|
#endif /* SVR42 */
|
|
#else
|
|
#error This routine is not valid for this OS.
|
|
#endif /* GENERIC_SYSV */
|
|
#endif
|
|
|
|
#endif
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
long
|
|
DMAbuf_init (long mem_start)
|
|
{
|
|
int dev;
|
|
|
|
#if defined(SVR42)
|
|
snd_dma_init ();
|
|
#endif /* SVR42 */
|
|
|
|
/*
|
|
* NOTE! This routine could be called several times.
|
|
*/
|
|
|
|
for (dev = 0; dev < num_audiodevs; dev++)
|
|
audio_devs[dev]->dmap = &dmaps[dev];
|
|
return mem_start;
|
|
}
|
|
|
|
void
|
|
DMAbuf_outputintr (int dev, int event_type)
|
|
{
|
|
/*
|
|
* Event types:
|
|
* 0 = DMA transfer done. Device still has more data in the local
|
|
* buffer.
|
|
* 1 = DMA transfer done. Device doesn't have local buffer or it's
|
|
* empty now.
|
|
* 2 = No DMA transfer but the device has now more space in it's local
|
|
* buffer.
|
|
*/
|
|
|
|
unsigned long flags;
|
|
struct dma_buffparms *dmap = audio_devs[dev]->dmap;
|
|
|
|
#if defined(SVR42)
|
|
snd_dma_intr (audio_devs[dev]->dmachan);
|
|
#endif /* SVR42 */
|
|
|
|
if (event_type != 2)
|
|
{
|
|
if (dmap->qlen <= 0 || dmap->qlen > dmap->nbufs)
|
|
{
|
|
printk ("\nSound: Audio queue3 corrupted for dev%d (%d/%d)\n",
|
|
dev, dmap->qlen, dmap->nbufs);
|
|
return;
|
|
}
|
|
|
|
dmap->qlen--;
|
|
dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
|
|
dmap->flags &= ~DMA_ACTIVE;
|
|
|
|
#ifdef __FreeBSD__
|
|
isa_dmadone(0, 0, 0, audio_devs[dev]->dmachan);
|
|
#endif
|
|
|
|
if (dmap->qlen)
|
|
{
|
|
audio_devs[dev]->output_block (dev, dmap->buf_phys[dmap->qhead],
|
|
dmap->counts[dmap->qhead], 1,
|
|
!(audio_devs[dev]->flags & DMA_AUTOMODE));
|
|
dmap->flags |= DMA_ACTIVE;
|
|
}
|
|
else if (event_type == 1)
|
|
{
|
|
dmap->underrun_count++;
|
|
audio_devs[dev]->halt_xfer (dev);
|
|
if ((audio_devs[dev]->flags & DMA_AUTOMODE) &&
|
|
audio_devs[dev]->flags & NEEDS_RESTART)
|
|
dmap->flags |= DMA_RESTART;
|
|
else
|
|
dmap->flags &= ~DMA_RESTART;
|
|
}
|
|
} /* event_type != 2 */
|
|
|
|
DISABLE_INTR (flags);
|
|
if (SOMEONE_WAITING (dev_sleeper[dev], dev_sleep_flag[dev]))
|
|
{
|
|
WAKE_UP (dev_sleeper[dev], dev_sleep_flag[dev]);
|
|
}
|
|
RESTORE_INTR (flags);
|
|
#if defined(__FreeBSD__)
|
|
if(selinfo[dev].si_pid)
|
|
selwakeup(&selinfo[dev]);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
DMAbuf_inputintr (int dev)
|
|
{
|
|
unsigned long flags;
|
|
struct dma_buffparms *dmap = audio_devs[dev]->dmap;
|
|
|
|
#if defined(SVR42)
|
|
snd_dma_intr (audio_devs[dev]->dmachan);
|
|
#endif /* SVR42 */
|
|
|
|
#ifdef __FreeBSD__
|
|
isa_dmadone(0, 0, 0, audio_devs[dev]->dmachan);
|
|
#endif
|
|
|
|
if (dmap->qlen == (dmap->nbufs - 1))
|
|
{
|
|
#if !defined(__FreeBSD__) /* ignore console message. */
|
|
printk ("Sound: Recording overrun\n");
|
|
#endif
|
|
dmap->underrun_count++;
|
|
audio_devs[dev]->halt_xfer (dev);
|
|
dmap->flags &= ~DMA_ACTIVE;
|
|
if (audio_devs[dev]->flags & DMA_AUTOMODE)
|
|
dmap->flags |= DMA_RESTART;
|
|
else
|
|
dmap->flags &= ~DMA_RESTART;
|
|
}
|
|
else
|
|
{
|
|
dmap->qlen++;
|
|
if (dmap->qlen <= 0 || dmap->qlen > dmap->nbufs)
|
|
printk ("\nSound: Audio queue4 corrupted for dev%d (%d/%d)\n",
|
|
dev, dmap->qlen, dmap->nbufs);
|
|
dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
|
|
|
|
audio_devs[dev]->start_input (dev, dmap->buf_phys[dmap->qtail],
|
|
dmap->fragment_size, 1,
|
|
!(audio_devs[dev]->flags & DMA_AUTOMODE));
|
|
dmap->flags |= DMA_ACTIVE;
|
|
}
|
|
|
|
DISABLE_INTR (flags);
|
|
if (SOMEONE_WAITING (dev_sleeper[dev], dev_sleep_flag[dev]))
|
|
{
|
|
WAKE_UP (dev_sleeper[dev], dev_sleep_flag[dev]);
|
|
}
|
|
RESTORE_INTR (flags);
|
|
#if defined(__FreeBSD__)
|
|
if(selinfo[dev].si_pid)
|
|
selwakeup(&selinfo[dev]);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
DMAbuf_open_dma (int dev)
|
|
{
|
|
unsigned long flags;
|
|
int chan = audio_devs[dev]->dmachan;
|
|
|
|
if (ALLOC_DMA_CHN (chan, audio_devs[dev]->name))
|
|
{
|
|
#if 0
|
|
/* Enough already! This error is reported twice elsewhere */
|
|
printk ("Unable to grab DMA%d for the audio driver\n", chan);
|
|
#endif
|
|
return RET_ERROR (EBUSY);
|
|
}
|
|
|
|
DISABLE_INTR (flags);
|
|
#ifdef linux
|
|
disable_dma (chan);
|
|
clear_dma_ff (chan);
|
|
#endif
|
|
RESTORE_INTR (flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
DMAbuf_close_dma (int dev)
|
|
{
|
|
int chan = audio_devs[dev]->dmachan;
|
|
|
|
DMAbuf_reset_dma (dev);
|
|
RELEASE_DMA_CHN (chan);
|
|
}
|
|
|
|
void
|
|
DMAbuf_reset_dma (int dev)
|
|
{
|
|
}
|
|
|
|
#ifdef ALLOW_SELECT
|
|
int
|
|
DMAbuf_select (int dev, struct fileinfo *file, int sel_type, select_table * wait)
|
|
{
|
|
struct dma_buffparms *dmap = audio_devs[dev]->dmap;
|
|
unsigned long flags;
|
|
|
|
switch (sel_type)
|
|
{
|
|
case SEL_IN:
|
|
if (dmap->dma_mode != DMODE_INPUT)
|
|
return 0;
|
|
|
|
DISABLE_INTR (flags);
|
|
if (!dmap->qlen)
|
|
{
|
|
#if defined(__FreeBSD__)
|
|
selrecord(wait, &selinfo[dev]);
|
|
#else
|
|
dev_sleep_flag[dev].mode = WK_SLEEP;
|
|
select_wait (&dev_sleeper[dev], wait);
|
|
#endif
|
|
RESTORE_INTR (flags);
|
|
return 0;
|
|
}
|
|
RESTORE_INTR (flags);
|
|
return 1;
|
|
break;
|
|
|
|
case SEL_OUT:
|
|
if (dmap->dma_mode == DMODE_INPUT)
|
|
return 0;
|
|
|
|
if (dmap->dma_mode == DMODE_NONE)
|
|
return 1;
|
|
|
|
DISABLE_INTR (flags);
|
|
if (!space_in_queue (dev))
|
|
{
|
|
#if defined(__FreeBSD__)
|
|
selrecord(wait, &selinfo[dev]);
|
|
#else
|
|
dev_sleep_flag[dev].mode = WK_SLEEP;
|
|
select_wait (&dev_sleeper[dev], wait);
|
|
#endif
|
|
RESTORE_INTR (flags);
|
|
return 0;
|
|
}
|
|
RESTORE_INTR (flags);
|
|
return 1;
|
|
break;
|
|
|
|
case SEL_EX:
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* ALLOW_SELECT */
|
|
|
|
#else /* EXCLUDE_AUDIO */
|
|
/*
|
|
* Stub versions if audio services not included
|
|
*/
|
|
|
|
int
|
|
DMAbuf_open (int dev, int mode)
|
|
{
|
|
return RET_ERROR (ENXIO);
|
|
}
|
|
|
|
int
|
|
DMAbuf_release (int dev, int mode)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
DMAbuf_getwrbuffer (int dev, char **buf, int *size, int dontblock)
|
|
{
|
|
return RET_ERROR (EIO);
|
|
}
|
|
|
|
int
|
|
DMAbuf_getrdbuffer (int dev, char **buf, int *len, int dontblock)
|
|
{
|
|
return RET_ERROR (EIO);
|
|
}
|
|
|
|
int
|
|
DMAbuf_rmchars (int dev, int buff_no, int c)
|
|
{
|
|
return RET_ERROR (EIO);
|
|
}
|
|
|
|
int
|
|
DMAbuf_start_output (int dev, int buff_no, int l)
|
|
{
|
|
return RET_ERROR (EIO);
|
|
}
|
|
|
|
int
|
|
DMAbuf_ioctl (int dev, unsigned int cmd, unsigned int arg, int local)
|
|
{
|
|
return RET_ERROR (EIO);
|
|
}
|
|
|
|
long
|
|
DMAbuf_init (long mem_start)
|
|
{
|
|
return mem_start;
|
|
}
|
|
|
|
int
|
|
DMAbuf_start_dma (int dev, unsigned long physaddr, int count, int dma_mode)
|
|
{
|
|
return RET_ERROR (EIO);
|
|
}
|
|
|
|
int
|
|
DMAbuf_open_dma (int dev)
|
|
{
|
|
return RET_ERROR (ENXIO);
|
|
}
|
|
|
|
void
|
|
DMAbuf_close_dma (int dev)
|
|
{
|
|
return;
|
|
}
|
|
|
|
void
|
|
DMAbuf_reset_dma (int dev)
|
|
{
|
|
return;
|
|
}
|
|
|
|
void
|
|
DMAbuf_inputintr (int dev)
|
|
{
|
|
return;
|
|
}
|
|
|
|
void
|
|
DMAbuf_outputintr (int dev, int underrun_flag)
|
|
{
|
|
return;
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|