patch-2.1.90 linux/drivers/sound/dmabuf.c.old
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- Lines: 1600
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.1.89/linux/drivers/sound/dmabuf.c.old
- Orig date:
Mon Dec 1 09:45:01 1997
diff -u --recursive --new-file v2.1.89/linux/drivers/sound/dmabuf.c.old linux/drivers/sound/dmabuf.c.old
@@ -1,1599 +0,0 @@
-/*
- * sound/dmabuf.c
- *
- * The DMA buffer manager for digitized voice applications
- */
-/*
- * Copyright (C) by Hannu Savolainen 1993-1997
- *
- * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
- * Version 2 (June 1991). See the "COPYING" file distributed with this software
- * for more info.
- */
-#include <linux/config.h>
-
-#define BE_CONSERVATIVE
-
-#include "sound_config.h"
-
-#if defined(CONFIG_AUDIO) || defined(CONFIG_GUSHW)
-
-static struct wait_queue *in_sleeper[MAX_AUDIO_DEV] =
-{NULL};
-static volatile struct snd_wait in_sleep_flag[MAX_AUDIO_DEV] =
-{
- {0}};
-static struct wait_queue *out_sleeper[MAX_AUDIO_DEV] =
-{NULL};
-static volatile struct snd_wait out_sleep_flag[MAX_AUDIO_DEV] =
-{
- {0}};
-
-static int ndmaps = 0;
-
-#define MAX_DMAP (MAX_AUDIO_DEV*2)
-
-static struct dma_buffparms dmaps[MAX_DMAP] =
-{
- {0}};
-
-static void dma_reset_output (int dev);
-static void dma_reset_input (int dev);
-static int local_start_dma (int dev, unsigned long physaddr, int count, int dma_mode);
-
-static void
-dma_init_buffers (int dev, struct dma_buffparms *dmap)
-{
-
- dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
- dmap->byte_counter = 0;
- dmap->max_byte_counter = 8000 * 60 * 60;
- dmap->bytes_in_use = dmap->buffsize;
-
- dmap->dma_mode = DMODE_NONE;
- dmap->mapping_flags = 0;
- dmap->neutral_byte = 0x80;
- dmap->data_rate = 8000;
- dmap->cfrag = -1;
- dmap->closing = 0;
- dmap->nbufs = 1;
- dmap->flags = DMA_BUSY; /* Other flags off */
-}
-
-static int
-open_dmap (int dev, int mode, struct dma_buffparms *dmap, int chan)
-{
- if (dmap->flags & DMA_BUSY)
- return -EBUSY;
-
- {
- int err;
-
- if ((err = sound_alloc_dmap (dev, dmap, chan)) < 0)
- return err;
- }
-
- if (dmap->raw_buf == NULL)
- {
- printk ("Sound: DMA buffers not available\n");
- return -ENOSPC; /* Memory allocation failed during boot */
- }
-
- if (sound_open_dma (chan, audio_devs[dev]->name))
- {
- printk ("Unable to grab(2) DMA%d for the audio driver\n", chan);
- return -EBUSY;
- }
-
- dma_init_buffers (dev, dmap);
- dmap->open_mode = mode;
- dmap->subdivision = dmap->underrun_count = 0;
- dmap->fragment_size = 0;
- dmap->max_fragments = 65536; /* Just a large value */
- dmap->byte_counter = 0;
- dmap->max_byte_counter = 8000 * 60 * 60;
- dmap->applic_profile = APF_NORMAL;
- dmap->needs_reorg = 1;
- dmap->audio_callback = NULL;
- dmap->callback_parm = 0;
-
-
- if (dmap->dma_mode & DMODE_OUTPUT)
- {
- out_sleep_flag[dev].opts = WK_NONE;
- }
- else
- {
- in_sleep_flag[dev].opts = WK_NONE;
- }
-
- return 0;
-}
-
-static void
-close_dmap (int dev, struct dma_buffparms *dmap, int chan)
-{
- sound_close_dma (chan);
-
- if (dmap->flags & DMA_BUSY)
- dmap->dma_mode = DMODE_NONE;
- dmap->flags &= ~DMA_BUSY;
-
- disable_dma (dmap->dma);
-}
-
-
-static unsigned int
-default_set_bits (int dev, unsigned int bits)
-{
- return audio_devs[dev]->d->ioctl (dev, SNDCTL_DSP_SETFMT, (caddr_t) & bits);
-}
-
-static int
-default_set_speed (int dev, int speed)
-{
- return audio_devs[dev]->d->ioctl (dev, SNDCTL_DSP_SPEED, (caddr_t) & speed);
-}
-
-static short
-default_set_channels (int dev, short channels)
-{
- int c = channels;
-
- return audio_devs[dev]->d->ioctl (dev, SNDCTL_DSP_CHANNELS, (caddr_t) & c);
-}
-
-static void
-check_driver (struct audio_driver *d)
-{
- if (d->set_speed == NULL)
- d->set_speed = default_set_speed;
- if (d->set_bits == NULL)
- d->set_bits = default_set_bits;
- if (d->set_channels == NULL)
- d->set_channels = default_set_channels;
-}
-
-int
-DMAbuf_open (int dev, int mode)
-{
- int retval;
- struct dma_buffparms *dmap_in = NULL;
- struct dma_buffparms *dmap_out = NULL;
-
- if (dev >= num_audiodevs)
- {
- return -ENXIO;
- }
-
- if (!audio_devs[dev])
- {
- return -ENXIO;
- }
-
- if (!(audio_devs[dev]->flags & DMA_DUPLEX))
- {
- audio_devs[dev]->dmap_in = audio_devs[dev]->dmap_out;
- audio_devs[dev]->dmap_in->dma = audio_devs[dev]->dmap_out->dma;
- }
-
- check_driver (audio_devs[dev]->d);
-
- if ((retval = audio_devs[dev]->d->open (dev, mode)) < 0)
- return retval;
-
- dmap_out = audio_devs[dev]->dmap_out;
- dmap_in = audio_devs[dev]->dmap_in;
-
- if (dmap_in == dmap_out)
- audio_devs[dev]->flags &= ~DMA_DUPLEX;
-
- if (mode & OPEN_WRITE)
- {
- if ((retval = open_dmap (dev, mode, dmap_out, audio_devs[dev]->dmap_out->dma)) < 0)
- {
- audio_devs[dev]->d->close (dev);
- return retval;
- }
- }
-
- audio_devs[dev]->enable_bits = mode;
-
- if (mode == OPEN_READ || (mode != OPEN_WRITE &&
- audio_devs[dev]->flags & DMA_DUPLEX))
- {
- if ((retval = open_dmap (dev, mode, dmap_in, audio_devs[dev]->dmap_in->dma)) < 0)
- {
- audio_devs[dev]->d->close (dev);
-
- if (mode & OPEN_WRITE)
- {
- close_dmap (dev, dmap_out, audio_devs[dev]->dmap_out->dma);
- }
-
- return retval;
- }
- }
-
- audio_devs[dev]->open_mode = mode;
- audio_devs[dev]->go = 1;
-
- if (mode & OPEN_READ)
- in_sleep_flag[dev].opts = WK_NONE;
-
- if (mode & OPEN_WRITE)
- out_sleep_flag[dev].opts = WK_NONE;
-
- audio_devs[dev]->d->set_bits (dev, 8);
- audio_devs[dev]->d->set_channels (dev, 1);
- audio_devs[dev]->d->set_speed (dev, DSP_DEFAULT_SPEED);
-
- if (audio_devs[dev]->dmap_out->dma_mode == DMODE_OUTPUT)
- {
- memset (audio_devs[dev]->dmap_out->raw_buf,
- audio_devs[dev]->dmap_out->neutral_byte,
- audio_devs[dev]->dmap_out->bytes_in_use);
- }
-
- return 0;
-}
-
-void
-DMAbuf_reset (int dev)
-{
- if (audio_devs[dev]->open_mode & OPEN_WRITE)
- dma_reset_output (dev);
-
- if (audio_devs[dev]->open_mode & OPEN_READ)
- dma_reset_input (dev);
-}
-
-static void
-dma_reset_output (int dev)
-{
- unsigned long flags;
- int tmout;
-
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
-
-
- if (!(dmap->flags & DMA_STARTED)) /* DMA is not active */
- return;
-
-/*
- * First wait until the current fragment has been played completely
- */
- save_flags (flags);
- cli ();
-
- tmout =
- (dmap->fragment_size * HZ) / dmap->data_rate;
-
- tmout += HZ / 5; /* Some safety distance */
-
- if (tmout < (HZ / 2))
- tmout = HZ / 2;
- if (tmout > 20 * HZ)
- tmout = 20 * HZ;
-
- audio_devs[dev]->dmap_out->flags |= DMA_SYNCING;
-
- audio_devs[dev]->dmap_out->underrun_count = 0;
- if (!signal_pending(current)
- && audio_devs[dev]->dmap_out->qlen
- && audio_devs[dev]->dmap_out->underrun_count == 0)
- {
-
- {
- unsigned long tlimit;
-
- if (tmout)
- current->timeout = tlimit = jiffies + (tmout);
- else
- tlimit = (unsigned long) -1;
- out_sleep_flag[dev].opts = WK_SLEEP;
- interruptible_sleep_on (&out_sleeper[dev]);
- if (!(out_sleep_flag[dev].opts & WK_WAKEUP))
- {
- if (jiffies >= tlimit)
- out_sleep_flag[dev].opts |= WK_TIMEOUT;
- }
- out_sleep_flag[dev].opts &= ~WK_SLEEP;
- };
- }
- audio_devs[dev]->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
-
-/*
- * Finally shut the device off
- */
-
- if (!(audio_devs[dev]->flags & DMA_DUPLEX) ||
- !audio_devs[dev]->d->halt_output)
- audio_devs[dev]->d->halt_io (dev);
- else
- audio_devs[dev]->d->halt_output (dev);
- audio_devs[dev]->dmap_out->flags &= ~DMA_STARTED;
- restore_flags (flags);
-
- clear_dma_ff (dmap->dma);
- disable_dma (dmap->dma);
- dmap->byte_counter = 0;
- reorganize_buffers (dev, audio_devs[dev]->dmap_out, 0);
- dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
-}
-
-static void
-dma_reset_input (int dev)
-{
- unsigned long flags;
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_in;
-
- save_flags (flags);
- cli ();
- if (!(audio_devs[dev]->flags & DMA_DUPLEX) ||
- !audio_devs[dev]->d->halt_input)
- audio_devs[dev]->d->halt_io (dev);
- else
- audio_devs[dev]->d->halt_input (dev);
- audio_devs[dev]->dmap_in->flags &= ~DMA_STARTED;
- restore_flags (flags);
-
- dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
- dmap->byte_counter = 0;
- reorganize_buffers (dev, audio_devs[dev]->dmap_in, 1);
-}
-
-void
-DMAbuf_launch_output (int dev, struct dma_buffparms *dmap)
-{
- if (!((audio_devs[dev]->enable_bits * audio_devs[dev]->go) & PCM_ENABLE_OUTPUT))
- return; /* Don't start DMA yet */
-
- dmap->dma_mode = DMODE_OUTPUT;
-
- if (!(dmap->flags & DMA_ACTIVE) || !(audio_devs[dev]->flags & DMA_AUTOMODE) || dmap->flags & DMA_NODMA)
- {
- if (!(dmap->flags & DMA_STARTED))
- {
- reorganize_buffers (dev, dmap, 0);
-
- if (audio_devs[dev]->d->prepare_for_output (dev,
- dmap->fragment_size, dmap->nbufs))
- return;
-
- if (!(dmap->flags & DMA_NODMA))
- {
- local_start_dma (dev, dmap->raw_buf_phys, dmap->bytes_in_use,
- DMA_MODE_WRITE);
- }
- dmap->flags |= DMA_STARTED;
- }
- if (dmap->counts[dmap->qhead] == 0)
- dmap->counts[dmap->qhead] = dmap->fragment_size;
-
- dmap->dma_mode = DMODE_OUTPUT;
- audio_devs[dev]->d->output_block (dev, dmap->raw_buf_phys +
- dmap->qhead * dmap->fragment_size,
- dmap->counts[dmap->qhead], 1);
- if (audio_devs[dev]->d->trigger)
- audio_devs[dev]->d->trigger (dev,
- audio_devs[dev]->enable_bits * audio_devs[dev]->go);
- }
- dmap->flags |= DMA_ACTIVE;
-}
-
-int
-DMAbuf_sync (int dev)
-{
- unsigned long flags;
- int tmout, n = 0;
-
- if (!audio_devs[dev]->go && (!audio_devs[dev]->enable_bits & PCM_ENABLE_OUTPUT))
- return 0;
-
- if (audio_devs[dev]->dmap_out->dma_mode == DMODE_OUTPUT)
- {
-
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
-
- save_flags (flags);
- cli ();
-
- tmout =
- (dmap->fragment_size * HZ) / dmap->data_rate;
-
- tmout += HZ / 5; /* Some safety distance */
-
- if (tmout < (HZ / 2))
- tmout = HZ / 2;
- if (tmout > 20 * HZ)
- tmout = 20 * HZ;
-
- ;
- if (dmap->qlen > 0)
- if (!(dmap->flags & DMA_ACTIVE))
- DMAbuf_launch_output (dev, dmap);
- ;
-
- audio_devs[dev]->dmap_out->flags |= DMA_SYNCING;
-
- audio_devs[dev]->dmap_out->underrun_count = 0;
- while (!signal_pending(current)
- && n++ <= audio_devs[dev]->dmap_out->nbufs
- && audio_devs[dev]->dmap_out->qlen
- && audio_devs[dev]->dmap_out->underrun_count == 0)
- {
-
- {
- unsigned long tlimit;
-
- if (tmout)
- current->timeout = tlimit = jiffies + (tmout);
- else
- tlimit = (unsigned long) -1;
- out_sleep_flag[dev].opts = WK_SLEEP;
- interruptible_sleep_on (&out_sleeper[dev]);
- if (!(out_sleep_flag[dev].opts & WK_WAKEUP))
- {
- if (jiffies >= tlimit)
- out_sleep_flag[dev].opts |= WK_TIMEOUT;
- }
- out_sleep_flag[dev].opts &= ~WK_SLEEP;
- };
- if ((out_sleep_flag[dev].opts & WK_TIMEOUT))
- {
- audio_devs[dev]->dmap_out->flags &= ~DMA_SYNCING;
- restore_flags (flags);
- return audio_devs[dev]->dmap_out->qlen;
- }
- }
- audio_devs[dev]->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
- restore_flags (flags);
- /*
- * Some devices such as GUS have huge amount of on board RAM for the
- * audio data. We have to wait until the device has finished playing.
- */
-
- save_flags (flags);
- cli ();
- if (audio_devs[dev]->d->local_qlen) /* Device has hidden buffers */
- {
- while (!signal_pending(current)
- && audio_devs[dev]->d->local_qlen (dev))
- {
-
- {
- unsigned long tlimit;
-
- if (tmout)
- current->timeout = tlimit = jiffies + (tmout);
- else
- tlimit = (unsigned long) -1;
- out_sleep_flag[dev].opts = WK_SLEEP;
- interruptible_sleep_on (&out_sleeper[dev]);
- if (!(out_sleep_flag[dev].opts & WK_WAKEUP))
- {
- if (jiffies >= tlimit)
- out_sleep_flag[dev].opts |= WK_TIMEOUT;
- }
- out_sleep_flag[dev].opts &= ~WK_SLEEP;
- };
- }
- }
- restore_flags (flags);
- }
- audio_devs[dev]->dmap_out->dma_mode = DMODE_NONE;
- return audio_devs[dev]->dmap_out->qlen;
-}
-
-int
-DMAbuf_release (int dev, int mode)
-{
- unsigned long flags;
-
- if (audio_devs[dev]->open_mode & OPEN_WRITE)
- audio_devs[dev]->dmap_out->closing = 1;
- if (audio_devs[dev]->open_mode & OPEN_READ)
- audio_devs[dev]->dmap_in->closing = 1;
-
- if (audio_devs[dev]->open_mode & OPEN_WRITE)
- if (!(audio_devs[dev]->dmap_in->mapping_flags & DMA_MAP_MAPPED))
- if (!signal_pending(current)
- && (audio_devs[dev]->dmap_out->dma_mode == DMODE_OUTPUT))
- {
- DMAbuf_sync (dev);
- }
-
- if (audio_devs[dev]->dmap_out->dma_mode == DMODE_OUTPUT)
- {
- memset (audio_devs[dev]->dmap_out->raw_buf,
- audio_devs[dev]->dmap_out->neutral_byte,
- audio_devs[dev]->dmap_out->bytes_in_use);
- }
-
- save_flags (flags);
- cli ();
-
- DMAbuf_reset (dev);
- audio_devs[dev]->d->close (dev);
-
- if (audio_devs[dev]->open_mode & OPEN_WRITE)
- close_dmap (dev, audio_devs[dev]->dmap_out, audio_devs[dev]->dmap_out->dma);
-
- if (audio_devs[dev]->open_mode == OPEN_READ ||
- (audio_devs[dev]->open_mode != OPEN_WRITE &&
- audio_devs[dev]->flags & DMA_DUPLEX))
- close_dmap (dev, audio_devs[dev]->dmap_in, audio_devs[dev]->dmap_in->dma);
- audio_devs[dev]->open_mode = 0;
-
- restore_flags (flags);
-
- return 0;
-}
-
-int
-DMAbuf_activate_recording (int dev, struct dma_buffparms *dmap)
-{
- if (!(audio_devs[dev]->open_mode & OPEN_READ))
- return 0;
-
- if (!(audio_devs[dev]->enable_bits & PCM_ENABLE_INPUT))
- return 0;
-
- if (dmap->dma_mode == DMODE_OUTPUT) /* Direction change */
- {
- DMAbuf_sync (dev);
- DMAbuf_reset (dev);
- dmap->dma_mode = DMODE_NONE;
- }
-
- if (!dmap->dma_mode)
- {
- int err;
-
- reorganize_buffers (dev, dmap, 1);
- if ((err = audio_devs[dev]->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 (dev, dmap->raw_buf_phys, dmap->bytes_in_use,
- DMA_MODE_READ);
- audio_devs[dev]->d->start_input (dev, dmap->raw_buf_phys +
- dmap->qtail * dmap->fragment_size,
- dmap->fragment_size, 0);
- dmap->flags |= DMA_ACTIVE;
- if (audio_devs[dev]->d->trigger)
- audio_devs[dev]->d->trigger (dev,
- audio_devs[dev]->enable_bits * audio_devs[dev]->go);
- }
- return 0;
-}
-
-int
-DMAbuf_getrdbuffer (int dev, char **buf, int *len, int dontblock)
-{
- unsigned long flags;
- int err = 0, n = 0;
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_in;
-
- if (!(audio_devs[dev]->open_mode & OPEN_READ))
- return -EIO;
- if (dmap->needs_reorg)
- reorganize_buffers (dev, dmap, 0);
-
- save_flags (flags);
- cli ();
- if (audio_devs[dev]->dmap_in->mapping_flags & DMA_MAP_MAPPED)
- {
- printk ("Sound: Can't read from mmapped device (1)\n");
- restore_flags (flags);
- return -EINVAL;
- }
- else
- while (dmap->qlen <= 0 && n++ < 10)
- {
- int tmout;
-
- if (!(audio_devs[dev]->enable_bits & PCM_ENABLE_INPUT) ||
- !audio_devs[dev]->go)
- {
- restore_flags (flags);
- return -EAGAIN;
- }
-
- if ((err = DMAbuf_activate_recording (dev, dmap)) < 0)
- {
- restore_flags (flags);
- return err;
- }
-
- /* Wait for the next block */
-
- if (dontblock)
- {
- restore_flags (flags);
- return -EAGAIN;
- }
-
- if (!audio_devs[dev]->go)
- tmout = 0;
- else
- {
- tmout =
- (dmap->fragment_size * HZ) / dmap->data_rate;
-
- tmout += HZ / 5; /* Some safety distance */
-
- if (tmout < (HZ / 2))
- tmout = HZ / 2;
- if (tmout > 20 * HZ)
- tmout = 20 * HZ;
- }
-
-
- {
- unsigned long tlimit;
-
- if (tmout)
- current->timeout = tlimit = jiffies + (tmout);
- else
- tlimit = (unsigned long) -1;
- in_sleep_flag[dev].opts = WK_SLEEP;
- interruptible_sleep_on (&in_sleeper[dev]);
- if (!(in_sleep_flag[dev].opts & WK_WAKEUP))
- {
- if (jiffies >= tlimit)
- in_sleep_flag[dev].opts |= WK_TIMEOUT;
- }
- in_sleep_flag[dev].opts &= ~WK_SLEEP;
- };
- if ((in_sleep_flag[dev].opts & WK_TIMEOUT))
- {
- err = -EIO;
- printk ("Sound: DMA (input) timed out - IRQ/DRQ config error?\n");
- dma_reset_input (dev);
- ;
- }
- else
- err = -EINTR;
- }
- restore_flags (flags);
-
- if (dmap->qlen <= 0)
- {
- if (err == 0)
- err = -EINTR;
- return err;
- }
-
- *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 dma_buffparms *dmap = audio_devs[dev]->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;
-}
-
-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 flags;
-
- save_flags (flags);
- cli ();
- if (!(dmap->flags & DMA_ACTIVE))
- pos = 0;
- else
- {
- int chan = dmap->dma;
-
- clear_dma_ff (chan);
- 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;
- enable_dma (dmap->dma);
- }
- restore_flags (flags);
- /* 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.
- */
-static void
-DMAbuf_start_device (int dev)
-{
- if (audio_devs[dev]->open_mode != 0)
- if (!audio_devs[dev]->go)
- {
- /* OK to start the device */
- audio_devs[dev]->go = 1;
-
- if (audio_devs[dev]->d->trigger)
- audio_devs[dev]->d->trigger (dev,
- audio_devs[dev]->enable_bits * audio_devs[dev]->go);
- }
-}
-
-void
-DMAbuf_start_devices (unsigned int devmask)
-{
- int dev;
-
- for (dev = 0; dev < num_audiodevs; dev++)
- if (devmask & (1 << dev))
- DMAbuf_start_device (dev);
-}
-
-int
-DMAbuf_space_in_queue (int dev)
-{
- int len, max, tmp;
- struct dma_buffparms *dmap = audio_devs[dev]->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 (audio_devs[dev]->d->local_qlen)
- {
- tmp = audio_devs[dev]->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;
-}
-
-static int
-output_sleep (int dev, int dontblock)
-{
- int tmout;
- int err = 0;
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
-
- if (dontblock)
- {
- return -EAGAIN;
- }
-
- if (!(audio_devs[dev]->enable_bits & PCM_ENABLE_OUTPUT))
- {
- return -EAGAIN;
- }
-
- /*
- * Wait for free space
- */
- if (!audio_devs[dev]->go || dmap->flags & DMA_NOTIMEOUT)
- tmout = 0;
- else
- {
- tmout =
- (dmap->fragment_size * HZ) / dmap->data_rate;
-
- tmout += HZ / 5; /* Some safety distance */
-
- if (tmout < (HZ / 2))
- tmout = HZ / 2;
- if (tmout > 20 * HZ)
- tmout = 20 * HZ;
- }
-
- if (signal_pending(current))
- return -EIO;
-
-
- {
- unsigned long tlimit;
-
- if (tmout)
- current->timeout = tlimit = jiffies + (tmout);
- else
- tlimit = (unsigned long) -1;
- out_sleep_flag[dev].opts = WK_SLEEP;
- interruptible_sleep_on (&out_sleeper[dev]);
- if (!(out_sleep_flag[dev].opts & WK_WAKEUP))
- {
- if (jiffies >= tlimit)
- out_sleep_flag[dev].opts |= WK_TIMEOUT;
- }
- out_sleep_flag[dev].opts &= ~WK_SLEEP;
- };
- if ((out_sleep_flag[dev].opts & WK_TIMEOUT))
- {
- printk ("Sound: DMA (output) timed out - IRQ/DRQ config error?\n");
- ;
- dma_reset_output (dev);
- }
- else if (signal_pending(current))
- {
- err = -EINTR;
- }
-
- return err;
-}
-
-static int
-find_output_space (int dev, char **buf, int *size)
-{
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
- unsigned long flags;
- 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;
- }
-
- save_flags (flags);
- cli ();
-
-#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) & ~3;
- if (offs < 0 || offs >= dmap->bytes_in_use)
- {
- printk ("OSS: 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)
- {
- restore_flags (flags);
- return 0;
- }
-
- if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes))
- {
- len = (maxfrags * dmap->fragment_size) - occupied_bytes;
- }
-
- *size = len & ~3;
-
- restore_flags (flags);
- return (len > 0);
-}
-
-int
-DMAbuf_getwrbuffer (int dev, char **buf, int *size, int dontblock)
-{
- unsigned long flags;
- int err = -EIO;
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
-
- if (dmap->needs_reorg)
- reorganize_buffers (dev, dmap, 0);
-
- if (dmap->mapping_flags & DMA_MAP_MAPPED)
- {
- printk ("Sound: Can't write to mmapped device (3)\n");
- return -EINVAL;
- }
-
- if (dmap->dma_mode == DMODE_INPUT) /* Direction change */
- {
- DMAbuf_reset (dev);
- dmap->dma_mode = DMODE_NONE;
- }
-
- dmap->dma_mode = DMODE_OUTPUT;
-
- save_flags (flags);
- cli ();
-
- while (find_output_space (dev, buf, size) <= 0)
- {
- if ((err = output_sleep (dev, dontblock)) < 0)
- {
- restore_flags (flags);
- return err;
- }
- }
-
- restore_flags (flags);
-
- return 0;
-}
-
-int
-DMAbuf_move_wrpointer (int dev, int l)
-{
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
- unsigned long ptr = (dmap->user_counter / dmap->fragment_size)
- * dmap->fragment_size;
-
- unsigned long end_ptr, p;
- int post = (dmap->flags & DMA_POST);
-
- ;
-
- dmap->flags &= ~DMA_POST;
-
- dmap->cfrag = -1;
-
- dmap->user_counter += l;
- dmap->flags |= DMA_DIRTY;
-
- if (dmap->user_counter >= dmap->max_byte_counter)
- { /* Wrap the byte counters */
- long decr = dmap->user_counter;
-
- dmap->user_counter = (dmap->user_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
- decr -= dmap->user_counter;
- dmap->byte_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 to perform some postprocessing to
- * the written data.
- */
- if (audio_devs[dev]->d->postprocess_write)
- audio_devs[dev]->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);
- }
-
- ;
- return 0;
-}
-
-int
-DMAbuf_start_dma (int dev, unsigned long physaddr, int count, int dma_mode)
-{
- int chan;
- struct dma_buffparms *dmap;
-
- if (dma_mode == DMA_MODE_WRITE)
- {
- chan = audio_devs[dev]->dmap_out->dma;
- dmap = audio_devs[dev]->dmap_out;
- }
- else
- {
- chan = audio_devs[dev]->dmap_in->dma;
- dmap = audio_devs[dev]->dmap_in;
- }
-
- if (dmap->raw_buf == NULL)
- {
- printk ("sound: DMA buffer(1) == NULL\n");
- printk ("Device %d, chn=%s\n", dev, (dmap == audio_devs[dev]->dmap_out) ? "out" : "in");
- return 0;
- }
-
- if (chan < 0)
- return 0;
-
- sound_start_dma (dev, dmap, chan, physaddr, count, dma_mode, 0);
-
- return count;
-}
-
-static int
-local_start_dma (int dev, unsigned long physaddr, int count, int dma_mode)
-{
- int chan;
- struct dma_buffparms *dmap;
-
- if (dma_mode == DMA_MODE_WRITE)
- {
- chan = audio_devs[dev]->dmap_out->dma;
- dmap = audio_devs[dev]->dmap_out;
- }
- else
- {
- chan = audio_devs[dev]->dmap_in->dma;
- dmap = audio_devs[dev]->dmap_in;
- }
-
- if (dmap->raw_buf == NULL)
- {
- printk ("sound: DMA buffer(2) == NULL\n");
- printk ("Device %d, chn=%s\n", dev, (dmap == audio_devs[dev]->dmap_out) ? "out" : "in");
- return 0;
- }
-
- if (dmap->flags & DMA_NODMA)
- {
- return 1;
- }
-
- if (chan < 0)
- return 0;
-
- sound_start_dma (dev, dmap, chan, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode, 1);
- dmap->flags |= DMA_STARTED;
-
- return count;
-}
-
-static void
-finish_output_interrupt (int dev, struct dma_buffparms *dmap)
-{
- unsigned long flags;
-
- if (dmap->audio_callback != NULL)
- dmap->audio_callback (dev, dmap->callback_parm);
-
- save_flags (flags);
- cli ();
- if ((out_sleep_flag[dev].opts & WK_SLEEP))
- {
- {
- out_sleep_flag[dev].opts = WK_WAKEUP;
- wake_up (&out_sleeper[dev]);
- };
- }
- restore_flags (flags);
-}
-
-static void
-do_outputintr (int dev, int dummy)
-{
- unsigned long flags;
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
- int this_fragment;
-
-#ifdef OS_DMA_INTR
- if (audio_devs[dev]->dmap_out->dma >= 0)
- sound_dma_intr (dev, audio_devs[dev]->dmap_out, audio_devs[dev]->dmap_out->dma);
-#endif
-
- if (dmap->raw_buf == NULL)
- {
- printk ("Sound: Fatal 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) + dmap->bytes_in_use;
- decr -= dmap->byte_counter;
- dmap->user_counter -= decr;
- }
- }
-
- dmap->qlen++; /* Yes increment it (don't decrement) */
- if (!(audio_devs[dev]->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;
- }
-
- save_flags (flags);
- cli ();
-
- 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) + dmap->bytes_in_use;
- decr -= dmap->byte_counter;
- dmap->user_counter -= decr;
- }
- }
-
- if (!(audio_devs[dev]->flags & DMA_AUTOMODE))
- dmap->flags &= ~DMA_ACTIVE;
-
- while (dmap->qlen < 0)
- {
- dmap->underrun_count++;
-
- dmap->qlen++;
- if (dmap->flags & DMA_DIRTY && dmap->applic_profile != APF_CPUINTENS)
- {
- dmap->flags &= ~DMA_DIRTY;
- memset (audio_devs[dev]->dmap_out->raw_buf,
- audio_devs[dev]->dmap_out->neutral_byte,
- audio_devs[dev]->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);
-
- restore_flags (flags);
- finish_output_interrupt (dev, dmap);
-}
-
-void
-DMAbuf_outputintr (int dev, int notify_only)
-{
- unsigned long flags;
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
-
- save_flags (flags);
- cli ();
-
- if (!(dmap->flags & DMA_NODMA))
- {
- int chan = dmap->dma, pos, n;
-
- clear_dma_ff (chan);
- disable_dma (dmap->dma);
- pos = dmap->bytes_in_use - get_dma_residue (chan);
- enable_dma (dmap->dma);
-
- 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);
- restore_flags (flags);
-}
-
-static void
-do_inputintr (int dev)
-{
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_in;
- unsigned long flags;
-
-#ifdef OS_DMA_INTR
- if (audio_devs[dev]->dmap_in->dma >= 0)
- sound_dma_intr (dev, audio_devs[dev]->dmap_in, audio_devs[dev]->dmap_in->dma);
-#endif
-
- if (dmap->raw_buf == NULL)
- {
- printk ("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 (!(audio_devs[dev]->flags & DMA_AUTOMODE))
- {
- if (dmap->needs_reorg)
- reorganize_buffers (dev, dmap, 0);
- local_start_dma (dev, dmap->raw_buf_phys, dmap->bytes_in_use,
- DMA_MODE_READ);
- audio_devs[dev]->d->start_input (dev, dmap->raw_buf_phys +
- dmap->qtail * dmap->fragment_size,
- dmap->fragment_size, 1);
- if (audio_devs[dev]->d->trigger)
- audio_devs[dev]->d->trigger (dev,
- audio_devs[dev]->enable_bits * audio_devs[dev]->go);
- }
-
- dmap->flags |= DMA_ACTIVE;
- }
- else if (dmap->qlen >= (dmap->nbufs - 1))
- {
- printk ("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 (!(audio_devs[dev]->flags & DMA_AUTOMODE) || dmap->flags & DMA_NODMA)
- {
- local_start_dma (dev, dmap->raw_buf_phys, dmap->bytes_in_use,
- DMA_MODE_READ);
- audio_devs[dev]->d->start_input (dev, dmap->raw_buf_phys +
- dmap->qtail * dmap->fragment_size,
- dmap->fragment_size, 1);
- if (audio_devs[dev]->d->trigger)
- audio_devs[dev]->d->trigger (dev,
- audio_devs[dev]->enable_bits * audio_devs[dev]->go);
- }
-
- dmap->flags |= DMA_ACTIVE;
-
- save_flags (flags);
- cli ();
- if (dmap->qlen > 0)
- if ((in_sleep_flag[dev].opts & WK_SLEEP))
- {
- {
- in_sleep_flag[dev].opts = WK_WAKEUP;
- wake_up (&in_sleeper[dev]);
- };
- }
- restore_flags (flags);
-}
-
-void
-DMAbuf_inputintr (int dev)
-{
- struct dma_buffparms *dmap = audio_devs[dev]->dmap_in;
- unsigned long flags;
-
- save_flags (flags);
- cli ();
-
- if (!(dmap->flags & DMA_NODMA))
- {
- int chan = dmap->dma, pos, n;
-
- clear_dma_ff (chan);
- disable_dma (dmap->dma);
- pos = dmap->bytes_in_use - get_dma_residue (chan);
- enable_dma (dmap->dma);
-
- 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);
- restore_flags (flags);
-}
-
-int
-DMAbuf_open_dma (int dev)
-{
-/*
- * NOTE! This routine opens only the primary DMA channel (output).
- */
-
- int chan = audio_devs[dev]->dmap_out->dma;
- int err;
-
- if ((err = open_dmap (dev, OPEN_READWRITE, audio_devs[dev]->dmap_out, chan)) < 0)
- {
- return -EBUSY;
- }
- dma_init_buffers (dev, audio_devs[dev]->dmap_out);
- out_sleep_flag[dev].opts = WK_NONE;
- audio_devs[dev]->dmap_out->flags |= DMA_ALLOC_DONE;
- audio_devs[dev]->dmap_out->fragment_size = audio_devs[dev]->dmap_out->buffsize;
-
- if (chan >= 0)
- {
- unsigned long flags;
-
- save_flags (flags);
- cli ();
- disable_dma (audio_devs[dev]->dmap_out->dma);
- clear_dma_ff (chan);
- restore_flags (flags);
- }
-
- return 0;
-}
-
-void
-DMAbuf_close_dma (int dev)
-{
- close_dmap (dev, audio_devs[dev]->dmap_out, audio_devs[dev]->dmap_out->dma);
-}
-
-void
-DMAbuf_init (int dev, int dma1, int dma2)
-{
- /*
- * NOTE! This routine could be called several times.
- */
-
- if (audio_devs[dev]->dmap_out == NULL)
- {
- if (audio_devs[dev]->d == NULL)
- panic ("OSS: audio_devs[%d]->d == NULL\n", dev);
-
- if (audio_devs[dev]->parent_dev)
- { /* Use DMA map of the parent dev */
- int parent = audio_devs[dev]->parent_dev - 1;
-
- audio_devs[dev]->dmap_out = audio_devs[parent]->dmap_out;
- audio_devs[dev]->dmap_in = audio_devs[parent]->dmap_in;
- }
- else
- {
- audio_devs[dev]->dmap_out =
- audio_devs[dev]->dmap_in =
- &dmaps[ndmaps++];
- audio_devs[dev]->dmap_out->dma = dma1;
-
- if (audio_devs[dev]->flags & DMA_DUPLEX)
- {
- audio_devs[dev]->dmap_in =
- &dmaps[ndmaps++];
- audio_devs[dev]->dmap_in->dma = dma2;
- }
- }
- }
-}
-
-int
-DMAbuf_select (int dev, struct fileinfo *file, int sel_type, poll_table * wait)
-{
- struct dma_buffparms *dmap;
- unsigned long flags;
-
- switch (sel_type)
- {
- case SEL_IN:
- if (!(audio_devs[dev]->open_mode & OPEN_READ))
- return 0;
-
- dmap = audio_devs[dev]->dmap_in;
-
- if (dmap->mapping_flags & DMA_MAP_MAPPED)
- {
- if (dmap->qlen)
- return 1;
-
- save_flags (flags);
- cli ();
-
- in_sleep_flag[dev].opts = WK_SLEEP;
- poll_wait (&in_sleeper[dev], wait);
- restore_flags (flags);
- return 0;
- }
-
- if (dmap->dma_mode != DMODE_INPUT)
- {
- if (dmap->dma_mode == DMODE_NONE &&
- audio_devs[dev]->enable_bits & PCM_ENABLE_INPUT &&
- !dmap->qlen &&
- audio_devs[dev]->go)
- {
- unsigned long flags;
-
- save_flags (flags);
- cli ();
- DMAbuf_activate_recording (dev, dmap);
- restore_flags (flags);
- }
- return 0;
- }
-
- if (!dmap->qlen)
- {
- save_flags (flags);
- cli ();
-
- in_sleep_flag[dev].opts = WK_SLEEP;
- poll_wait (&in_sleeper[dev], wait);
- restore_flags (flags);
- return 0;
- }
- return 1;
- break;
-
- case SEL_OUT:
- dmap = audio_devs[dev]->dmap_out;
-
- if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
- return 0;
-
- if (dmap->mapping_flags & DMA_MAP_MAPPED)
- {
- if (dmap->qlen)
- return 1;
-
- save_flags (flags);
- cli ();
-
- out_sleep_flag[dev].opts = WK_SLEEP;
- poll_wait (&out_sleeper[dev], wait);
- restore_flags (flags);
- return 0;
- }
-
- if (dmap->dma_mode == DMODE_INPUT)
- {
- return 0;
- }
-
- if (dmap->dma_mode == DMODE_NONE)
- {
- return 1;
- }
-
- if (!DMAbuf_space_in_queue (dev))
- {
- save_flags (flags);
- cli ();
-
- out_sleep_flag[dev].opts = WK_SLEEP;
- poll_wait (&out_sleeper[dev], wait);
- restore_flags (flags);
- return 0;
- }
- return 1;
- break;
-
- case SEL_EX:
- return 0;
- }
-
- return 0;
-}
-
-
-#endif
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov