dmabuf.c
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上传日期:2013-02-24
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文件大小:34k
- /*
- * 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.
- *
- * Thomas Sailer : moved several static variables into struct audio_operations
- * (which is grossly misnamed btw.) because they have the same
- * lifetime as the rest in there and dynamic allocation saves
- * 12k or so
- * Thomas Sailer : remove {in,out}_sleep_flag. It was used for the sleeper to
- * determine if it was woken up by the expiring timeout or by
- * an explicit wake_up. The return value from schedule_timeout
- * can be used instead; if 0, the wakeup was due to the timeout.
- *
- * Rob Riggs Added persistent DMA buffers (1998/10/17)
- */
- #define BE_CONSERVATIVE
- #define SAMPLE_ROUNDUP 0
- #include "sound_config.h"
- #include <linux/wrapper.h>
- #define DMAP_FREE_ON_CLOSE 0
- #define DMAP_KEEP_ON_CLOSE 1
- extern int sound_dmap_flag;
- static void dma_reset_output(int dev);
- static void dma_reset_input(int dev);
- static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode);
- static int debugmem = 0; /* switched off by default */
- static int dma_buffsize = DSP_BUFFSIZE;
- static long dmabuf_timeout(struct dma_buffparms *dmap)
- {
- long tmout;
- 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;
- return tmout;
- }
- static int sound_alloc_dmap(struct dma_buffparms *dmap)
- {
- char *start_addr, *end_addr;
- int dma_pagesize;
- int sz, size;
- struct page *page;
- dmap->mapping_flags &= ~DMA_MAP_MAPPED;
- if (dmap->raw_buf != NULL)
- return 0; /* Already done */
- if (dma_buffsize < 4096)
- dma_buffsize = 4096;
- dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024);
-
- /*
- * Now check for the Cyrix problem.
- */
-
- if(isa_dma_bridge_buggy==2)
- dma_pagesize=32768;
-
- dmap->raw_buf = NULL;
- dmap->buffsize = dma_buffsize;
- if (dmap->buffsize > dma_pagesize)
- dmap->buffsize = dma_pagesize;
- start_addr = NULL;
- /*
- * Now loop until we get a free buffer. Try to get smaller buffer if
- * it fails. Don't accept smaller than 8k buffer for performance
- * reasons.
- */
- while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) {
- for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
- dmap->buffsize = PAGE_SIZE * (1 << sz);
- start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA, sz);
- if (start_addr == NULL)
- dmap->buffsize /= 2;
- }
- if (start_addr == NULL) {
- printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffern");
- return -ENOMEM;
- } else {
- /* make some checks */
- end_addr = start_addr + dmap->buffsize - 1;
- if (debugmem)
- printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lxn", (long) start_addr, (long) end_addr);
-
- /* now check if it fits into the same dma-pagesize */
- if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1))
- || end_addr >= (char *) (MAX_DMA_ADDRESS)) {
- printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffern", (long) start_addr, dmap->buffsize);
- return -EFAULT;
- }
- }
- dmap->raw_buf = start_addr;
- dmap->raw_buf_phys = virt_to_bus(start_addr);
- for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
- mem_map_reserve(page);
- return 0;
- }
- static void sound_free_dmap(struct dma_buffparms *dmap)
- {
- int sz, size;
- struct page *page;
- unsigned long start_addr, end_addr;
- if (dmap->raw_buf == NULL)
- return;
- if (dmap->mapping_flags & DMA_MAP_MAPPED)
- return; /* Don't free mmapped buffer. Will use it next time */
- for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
- start_addr = (unsigned long) dmap->raw_buf;
- end_addr = start_addr + dmap->buffsize;
- for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
- mem_map_unreserve(page);
- free_pages((unsigned long) dmap->raw_buf, sz);
- dmap->raw_buf = NULL;
- }
- /* Intel version !!!!!!!!! */
- static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode)
- {
- unsigned long flags;
- int chan = dmap->dma;
- /* printk( "Start DMA%d %d, %dn", chan, (int)(physaddr-dmap->raw_buf_phys), count); */
- flags = claim_dma_lock();
- 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);
- release_dma_lock(flags);
- return 0;
- }
- static void dma_init_buffers(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(struct audio_operations *adev, int mode, struct dma_buffparms *dmap)
- {
- int err;
-
- if (dmap->flags & DMA_BUSY)
- return -EBUSY;
- if ((err = sound_alloc_dmap(dmap)) < 0)
- return err;
- if (dmap->raw_buf == NULL) {
- printk(KERN_WARNING "Sound: DMA buffers not availablen");
- return -ENOSPC; /* Memory allocation failed during boot */
- }
- if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) {
- printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio drivern", dmap->dma);
- return -EBUSY;
- }
- dma_init_buffers(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;
- return 0;
- }
- static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap)
- {
- unsigned long flags;
-
- if (dmap->dma >= 0) {
- sound_close_dma(dmap->dma);
- flags=claim_dma_lock();
- disable_dma(dmap->dma);
- release_dma_lock(flags);
- }
- if (dmap->flags & DMA_BUSY)
- dmap->dma_mode = DMODE_NONE;
- dmap->flags &= ~DMA_BUSY;
-
- if (sound_dmap_flag == DMAP_FREE_ON_CLOSE)
- sound_free_dmap(dmap);
- }
- static unsigned int default_set_bits(int dev, unsigned int bits)
- {
- mm_segment_t fs = get_fs();
- set_fs(get_ds());
- audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (caddr_t)&bits);
- set_fs(fs);
- return bits;
- }
- static int default_set_speed(int dev, int speed)
- {
- mm_segment_t fs = get_fs();
- set_fs(get_ds());
- audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (caddr_t)&speed);
- set_fs(fs);
- return speed;
- }
- static short default_set_channels(int dev, short channels)
- {
- int c = channels;
- mm_segment_t fs = get_fs();
- set_fs(get_ds());
- audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (caddr_t)&c);
- set_fs(fs);
- return 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)
- {
- struct audio_operations *adev = audio_devs[dev];
- int retval;
- struct dma_buffparms *dmap_in = NULL;
- struct dma_buffparms *dmap_out = NULL;
- if (!adev)
- return -ENXIO;
- if (!(adev->flags & DMA_DUPLEX))
- adev->dmap_in = adev->dmap_out;
- check_driver(adev->d);
- if ((retval = adev->d->open(dev, mode)) < 0)
- return retval;
- dmap_out = adev->dmap_out;
- dmap_in = adev->dmap_in;
- if (dmap_in == dmap_out)
- adev->flags &= ~DMA_DUPLEX;
- if (mode & OPEN_WRITE) {
- if ((retval = open_dmap(adev, mode, dmap_out)) < 0) {
- adev->d->close(dev);
- return retval;
- }
- }
- adev->enable_bits = mode;
- if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) {
- if ((retval = open_dmap(adev, mode, dmap_in)) < 0) {
- adev->d->close(dev);
- if (mode & OPEN_WRITE)
- close_dmap(adev, dmap_out);
- return retval;
- }
- }
- adev->open_mode = mode;
- adev->go = 1;
- adev->d->set_bits(dev, 8);
- adev->d->set_channels(dev, 1);
- adev->d->set_speed(dev, DSP_DEFAULT_SPEED);
- 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);
- 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)
- {
- struct audio_operations *adev = audio_devs[dev];
- unsigned long flags,f ;
- struct dma_buffparms *dmap = adev->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();
- adev->dmap_out->flags |= DMA_SYNCING;
- adev->dmap_out->underrun_count = 0;
- if (!signal_pending(current) && adev->dmap_out->qlen &&
- adev->dmap_out->underrun_count == 0)
- interruptible_sleep_on_timeout(&adev->out_sleeper,
- dmabuf_timeout(dmap));
- adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
- /*
- * Finally shut the device off
- */
- if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output)
- adev->d->halt_io(dev);
- else
- adev->d->halt_output(dev);
- adev->dmap_out->flags &= ~DMA_STARTED;
-
- f=claim_dma_lock();
- clear_dma_ff(dmap->dma);
- disable_dma(dmap->dma);
- release_dma_lock(f);
-
- restore_flags(flags);
- dmap->byte_counter = 0;
- reorganize_buffers(dev, adev->dmap_out, 0);
- dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
- }
- static void dma_reset_input(int dev)
- {
- struct audio_operations *adev = audio_devs[dev];
- unsigned long flags;
- struct dma_buffparms *dmap = adev->dmap_in;
- save_flags(flags);
- cli();
- if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input)
- adev->d->halt_io(dev);
- else
- adev->d->halt_input(dev);
- adev->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, adev->dmap_in, 1);
- }
- void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap)
- {
- struct audio_operations *adev = audio_devs[dev];
- if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT))
- return; /* Don't start DMA yet */
- dmap->dma_mode = DMODE_OUTPUT;
- if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
- if (!(dmap->flags & DMA_STARTED)) {
- reorganize_buffers(dev, dmap, 0);
- if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs))
- return;
- if (!(dmap->flags & DMA_NODMA))
- local_start_dma(adev, 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;
- adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size,
- dmap->counts[dmap->qhead], 1);
- if (adev->d->trigger)
- adev->d->trigger(dev,adev->enable_bits * adev->go);
- }
- dmap->flags |= DMA_ACTIVE;
- }
- int DMAbuf_sync(int dev)
- {
- struct audio_operations *adev = audio_devs[dev];
- unsigned long flags;
- int n = 0;
- struct dma_buffparms *dmap;
- if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT))
- return 0;
- if (adev->dmap_out->dma_mode == DMODE_OUTPUT) {
- dmap = adev->dmap_out;
- save_flags(flags);
- cli();
- if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE))
- DMAbuf_launch_output(dev, dmap);
- adev->dmap_out->flags |= DMA_SYNCING;
- adev->dmap_out->underrun_count = 0;
- while (!signal_pending(current) && n++ <= adev->dmap_out->nbufs &&
- adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) {
- long t = dmabuf_timeout(dmap);
- t = interruptible_sleep_on_timeout(&adev->out_sleeper,
- t);
- if (!t) {
- adev->dmap_out->flags &= ~DMA_SYNCING;
- restore_flags(flags);
- return adev->dmap_out->qlen;
- }
- }
- adev->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 (adev->d->local_qlen) { /* Device has hidden buffers */
- while (!signal_pending(current) &&
- adev->d->local_qlen(dev))
- interruptible_sleep_on_timeout(&adev->out_sleeper,
- dmabuf_timeout(dmap));
- }
- restore_flags(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];
- unsigned long flags;
- if (adev->open_mode & OPEN_WRITE)
- adev->dmap_out->closing = 1;
- if (adev->open_mode & OPEN_READ)
- adev->dmap_in->closing = 1;
- 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);
- save_flags(flags);
- cli();
- DMAbuf_reset(dev);
- 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;
- restore_flags(flags);
- return 0;
- }
- 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 */
- DMAbuf_sync(dev);
- DMAbuf_reset(dev);
- 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;
- }
- 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;
- if (dmap->needs_reorg)
- reorganize_buffers(dev, dmap, 0);
- save_flags(flags);
- cli();
- if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) {
- /* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)n");*/
- restore_flags(flags);
- return -EINVAL;
- } else while (dmap->qlen <= 0 && n++ < 10) {
- long timeout = MAX_SCHEDULE_TIMEOUT;
- if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->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 ((go = adev->go))
- timeout = dmabuf_timeout(dmap);
- 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;
- }
- restore_flags(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;
- }
- 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;
- unsigned long f;
- save_flags(flags);
- cli();
- 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);
- }
- 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.
- */
- 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);
- }
- }
- 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;
- }
- 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;
- }
- 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 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) & ~SAMPLE_ROUNDUP;
- if (offs < 0 || offs >= dmap->bytes_in_use) {
- restore_flags(flags);
- printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.n", offs);
- printk("Counter = %ld, bytes=%dn", 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 & ~SAMPLE_ROUNDUP;
- restore_flags(flags);
- return (*size > 0);
- }
- 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->needs_reorg)
- reorganize_buffers(dev, dmap, 0);
- if (dmap->mapping_flags & DMA_MAP_MAPPED) {
- /* printk(KERN_DEBUG "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 audio_operations *adev = audio_devs[dev];
- struct dma_buffparms *dmap = adev->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->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 to 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);
- 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) == NULLn");
- printk("Device %d, chn=%sn", 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) == NULLn");
- printk(KERN_ERR "Device %s, chn=%sn", 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);
- }
- static void do_outputintr(int dev, int dummy)
- {
- struct audio_operations *adev = audio_devs[dev];
- unsigned long flags;
- 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;
- }
- 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);
- 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);
- restore_flags(flags);
- finish_output_interrupt(dev, dmap);
- }
- 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;
- save_flags(flags);
- cli();
- 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);
- restore_flags(flags);
- }
- 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 overrunn");
- 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);
- }
- }
- void DMAbuf_inputintr(int dev)
- {
- struct audio_operations *adev = audio_devs[dev];
- struct dma_buffparms *dmap = adev->dmap_in;
- unsigned long flags;
- save_flags(flags);
- cli();
- 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);
- restore_flags(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 == NULLn", 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;
-
- save_flags(flags);
- cli();
- DMAbuf_activate_recording(dev, dmap);
- restore_flags(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);
- }
- }