diff options
Diffstat (limited to 'sound/oss/dmabuf.c')
| -rw-r--r-- | sound/oss/dmabuf.c | 1267 |
1 files changed, 1267 insertions, 0 deletions
diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c new file mode 100644 index 0000000..1e90d76 --- /dev/null +++ b/sound/oss/dmabuf.c @@ -0,0 +1,1267 @@ +/* + * sound/oss/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 <linux/mm.h> +#include "sound_config.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; /* 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|__GFP_NOWARN, sz); + if (start_addr == NULL) + dmap->buffsize /= 2; + } + + if (start_addr == NULL) { + printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n"); + return -ENOMEM; + } else { + /* make some checks */ + end_addr = start_addr + dmap->buffsize - 1; + + if (debugmem) + printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (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-buffer\n", (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++) + SetPageReserved(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++) + ClearPageReserved(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, %d\n", 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 available\n"); + 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 driver\n", dmap->dma); + return -EBUSY; + } + dma_init_buffers(dmap); + spin_lock_init(&dmap->lock); + 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, (void __user *)&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, (void __user *)&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, (void __user *)&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; +} +/* MUST not hold the spinlock */ +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 + */ + spin_lock_irqsave(&dmap->lock,flags); + 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){ + spin_unlock_irqrestore(&dmap->lock,flags); + interruptible_sleep_on_timeout(&adev->out_sleeper, + dmabuf_timeout(dmap)); + spin_lock_irqsave(&dmap->lock,flags); + } + 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); + + dmap->byte_counter = 0; + reorganize_buffers(dev, adev->dmap_out, 0); + dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; + spin_unlock_irqrestore(&dmap->lock,flags); +} + +static void dma_reset_input(int dev) +{ + struct audio_operations *adev = audio_devs[dev]; + unsigned long flags; + struct dma_buffparms *dmap = adev->dmap_in; + + spin_lock_irqsave(&dmap->lock,flags); + 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; + + dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; + dmap->byte_counter = 0; + reorganize_buffers(dev, adev->dmap_in, 1); + spin_unlock_irqrestore(&dmap->lock,flags); +} +/* MUST be called with holding the dmap->lock */ +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; + spin_lock_irqsave(&dmap->lock,flags); + 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); + spin_unlock_irqrestore(&dmap->lock,flags); + /* FIXME: not safe may miss events */ + t = interruptible_sleep_on_timeout(&adev->out_sleeper, t); + spin_lock_irqsave(&dmap->lock,flags); + if (!t) { + adev->dmap_out->flags &= ~DMA_SYNCING; + spin_unlock_irqrestore(&dmap->lock,flags); + return adev->dmap_out->qlen; + } + } + adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); + + /* + * 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. + */ + + /* still holding the lock */ + if (adev->d->local_qlen) { /* Device has hidden buffers */ + while (!signal_pending(current) && + adev->d->local_qlen(dev)){ + spin_unlock_irqrestore(&dmap->lock,flags); + interruptible_sleep_on_timeout(&adev->out_sleeper, + dmabuf_timeout(dmap)); + spin_lock_irqsave(&dmap->lock,flags); + } + } + spin_unlock_irqrestore(&dmap->lock,flags); + } + adev->dmap_out->dma_mode = DMODE_NONE; + return adev->dmap_out->qlen; +} + +int DMAbuf_release(int dev, int mode) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap; + unsigned long flags; + + dmap = adev->dmap_out; + if (adev->open_mode & OPEN_WRITE) + adev->dmap_out->closing = 1; + + if (adev->open_mode & OPEN_READ){ + adev->dmap_in->closing = 1; + dmap = adev->dmap_in; + } + if (adev->open_mode & OPEN_WRITE) + if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED)) + if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT)) + DMAbuf_sync(dev); + if (adev->dmap_out->dma_mode == DMODE_OUTPUT) + memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use); + + DMAbuf_reset(dev); + spin_lock_irqsave(&dmap->lock,flags); + adev->d->close(dev); + + if (adev->open_mode & OPEN_WRITE) + close_dmap(adev, adev->dmap_out); + + if (adev->open_mode == OPEN_READ || + (adev->open_mode != OPEN_WRITE && + (adev->flags & DMA_DUPLEX))) + close_dmap(adev, adev->dmap_in); + adev->open_mode = 0; + spin_unlock_irqrestore(&dmap->lock,flags); + return 0; +} +/* called with dmap->lock dold */ +int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap) +{ + struct audio_operations *adev = audio_devs[dev]; + int err; + + if (!(adev->open_mode & OPEN_READ)) + return 0; + if (!(adev->enable_bits & PCM_ENABLE_INPUT)) + return 0; + if (dmap->dma_mode == DMODE_OUTPUT) { /* Direction change */ + /* release lock - it's not recursive */ + spin_unlock_irq(&dmap->lock); + DMAbuf_sync(dev); + DMAbuf_reset(dev); + spin_lock_irq(&dmap->lock); + dmap->dma_mode = DMODE_NONE; + } + if (!dmap->dma_mode) { + reorganize_buffers(dev, dmap, 1); + if ((err = adev->d->prepare_for_input(dev, + dmap->fragment_size, dmap->nbufs)) < 0) + return err; + dmap->dma_mode = DMODE_INPUT; + } + if (!(dmap->flags & DMA_ACTIVE)) { + if (dmap->needs_reorg) + reorganize_buffers(dev, dmap, 0); + local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); + adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, + dmap->fragment_size, 0); + dmap->flags |= DMA_ACTIVE; + if (adev->d->trigger) + adev->d->trigger(dev, adev->enable_bits * adev->go); + } + return 0; +} +/* acquires lock */ +int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock) +{ + struct audio_operations *adev = audio_devs[dev]; + unsigned long flags; + int err = 0, n = 0; + struct dma_buffparms *dmap = adev->dmap_in; + int go; + + if (!(adev->open_mode & OPEN_READ)) + return -EIO; + spin_lock_irqsave(&dmap->lock,flags); + if (dmap->needs_reorg) + reorganize_buffers(dev, dmap, 0); + if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) { +/* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/ + spin_unlock_irqrestore(&dmap->lock,flags); + return -EINVAL; + } else while (dmap->qlen <= 0 && n++ < 10) { + long timeout = MAX_SCHEDULE_TIMEOUT; + if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) { + spin_unlock_irqrestore(&dmap->lock,flags); + return -EAGAIN; + } + if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) { + spin_unlock_irqrestore(&dmap->lock,flags); + return err; + } + /* Wait for the next block */ + + if (dontblock) { + spin_unlock_irqrestore(&dmap->lock,flags); + return -EAGAIN; + } + if ((go = adev->go)) + timeout = dmabuf_timeout(dmap); + + spin_unlock_irqrestore(&dmap->lock,flags); + timeout = interruptible_sleep_on_timeout(&adev->in_sleeper, + timeout); + if (!timeout) { + /* FIXME: include device name */ + err = -EIO; + printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n"); + dma_reset_input(dev); + } else + err = -EINTR; + spin_lock_irqsave(&dmap->lock,flags); + } + spin_unlock_irqrestore(&dmap->lock,flags); + + if (dmap->qlen <= 0) + return err ? err : -EINTR; + *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]]; + *len = dmap->fragment_size - dmap->counts[dmap->qhead]; + + return dmap->qhead; +} + +int DMAbuf_rmchars(int dev, int buff_no, int c) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = adev->dmap_in; + int p = dmap->counts[dmap->qhead] + c; + + if (dmap->mapping_flags & DMA_MAP_MAPPED) + { +/* printk("Sound: Can't read from mmapped device (2)\n");*/ + return -EINVAL; + } + else if (dmap->qlen <= 0) + return -EIO; + else if (p >= dmap->fragment_size) { /* This buffer is completely empty */ + dmap->counts[dmap->qhead] = 0; + dmap->qlen--; + dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; + } + else dmap->counts[dmap->qhead] = p; + + return 0; +} +/* MUST be called with dmap->lock hold */ +int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction) +{ + /* + * Try to approximate the active byte position of the DMA pointer within the + * buffer area as well as possible. + */ + + int pos; + unsigned long f; + + if (!(dmap->flags & DMA_ACTIVE)) + pos = 0; + else { + int chan = dmap->dma; + + f=claim_dma_lock(); + clear_dma_ff(chan); + + if(!isa_dma_bridge_buggy) + disable_dma(dmap->dma); + + pos = get_dma_residue(chan); + + pos = dmap->bytes_in_use - pos; + + if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) { + if (direction == DMODE_OUTPUT) { + if (dmap->qhead == 0) + if (pos > dmap->fragment_size) + pos = 0; + } else { + if (dmap->qtail == 0) + if (pos > dmap->fragment_size) + pos = 0; + } + } + if (pos < 0) + pos = 0; + if (pos >= dmap->bytes_in_use) + pos = 0; + + if(!isa_dma_bridge_buggy) + enable_dma(dmap->dma); + + release_dma_lock(f); + } + /* printk( "%04x ", pos); */ + + return pos; +} + +/* + * DMAbuf_start_devices() is called by the /dev/music driver to start + * one or more audio devices at desired moment. + */ + +void DMAbuf_start_devices(unsigned int devmask) +{ + struct audio_operations *adev; + int dev; + + for (dev = 0; dev < num_audiodevs; dev++) { + if (!(devmask & (1 << dev))) + continue; + if (!(adev = audio_devs[dev])) + continue; + if (adev->open_mode == 0) + continue; + if (adev->go) + continue; + /* OK to start the device */ + adev->go = 1; + if (adev->d->trigger) + adev->d->trigger(dev,adev->enable_bits * adev->go); + } +} +/* via poll called without a lock ?*/ +int DMAbuf_space_in_queue(int dev) +{ + struct audio_operations *adev = audio_devs[dev]; + int len, max, tmp; + struct dma_buffparms *dmap = adev->dmap_out; + int lim = dmap->nbufs; + + if (lim < 2) + lim = 2; + + if (dmap->qlen >= lim) /* No space at all */ + return 0; + + /* + * Verify that there are no more pending buffers than the limit + * defined by the process. + */ + + max = dmap->max_fragments; + if (max > lim) + max = lim; + len = dmap->qlen; + + if (adev->d->local_qlen) { + tmp = adev->d->local_qlen(dev); + if (tmp && len) + tmp--; /* This buffer has been counted twice */ + len += tmp; + } + if (dmap->byte_counter % dmap->fragment_size) /* There is a partial fragment */ + len = len + 1; + + if (len >= max) + return 0; + return max - len; +} +/* MUST not hold the spinlock - this function may sleep */ +static int output_sleep(int dev, int dontblock) +{ + struct audio_operations *adev = audio_devs[dev]; + int err = 0; + struct dma_buffparms *dmap = adev->dmap_out; + long timeout; + long timeout_value; + + if (dontblock) + return -EAGAIN; + if (!(adev->enable_bits & PCM_ENABLE_OUTPUT)) + return -EAGAIN; + + /* + * Wait for free space + */ + if (signal_pending(current)) + return -EINTR; + timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT)); + if (timeout) + timeout_value = dmabuf_timeout(dmap); + else + timeout_value = MAX_SCHEDULE_TIMEOUT; + timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper, + timeout_value); + if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) { + printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n"); + dma_reset_output(dev); + } else { + if (signal_pending(current)) + err = -EINTR; + } + return err; +} +/* called with the lock held */ +static int find_output_space(int dev, char **buf, int *size) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = adev->dmap_out; + unsigned long active_offs; + long len, offs; + int maxfrags; + int occupied_bytes = (dmap->user_counter % dmap->fragment_size); + + *buf = dmap->raw_buf; + if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes) + return 0; + +#ifdef BE_CONSERVATIVE + active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size; +#else + active_offs = max(DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT), 0); + /* Check for pointer wrapping situation */ + if (active_offs >= dmap->bytes_in_use) + active_offs = 0; + active_offs += dmap->byte_counter; +#endif + + offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP; + if (offs < 0 || offs >= dmap->bytes_in_use) { + printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs); + printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use); + return 0; + } + *buf = dmap->raw_buf + offs; + + len = active_offs + dmap->bytes_in_use - dmap->user_counter; /* Number of unused bytes in buffer */ + + if ((offs + len) > dmap->bytes_in_use) + len = dmap->bytes_in_use - offs; + if (len < 0) { + return 0; + } + if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes)) + len = (maxfrags * dmap->fragment_size) - occupied_bytes; + *size = len & ~SAMPLE_ROUNDUP; + return (*size > 0); +} +/* acquires lock */ +int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock) +{ + struct audio_operations *adev = audio_devs[dev]; + unsigned long flags; + int err = -EIO; + struct dma_buffparms *dmap = adev->dmap_out; + + if (dmap->mapping_flags & DMA_MAP_MAPPED) { +/* printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/ + return -EINVAL; + } + spin_lock_irqsave(&dmap->lock,flags); + if (dmap->needs_reorg) + reorganize_buffers(dev, dmap, 0); + + if (dmap->dma_mode == DMODE_INPUT) { /* Direction change */ + spin_unlock_irqrestore(&dmap->lock,flags); + DMAbuf_reset(dev); + spin_lock_irqsave(&dmap->lock,flags); + } + dmap->dma_mode = DMODE_OUTPUT; + + while (find_output_space(dev, buf, size) <= 0) { + spin_unlock_irqrestore(&dmap->lock,flags); + if ((err = output_sleep(dev, dontblock)) < 0) { + return err; + } + spin_lock_irqsave(&dmap->lock,flags); + } + + spin_unlock_irqrestore(&dmap->lock,flags); + return 0; +} +/* has to acquire dmap->lock */ +int DMAbuf_move_wrpointer(int dev, int l) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = adev->dmap_out; + unsigned long ptr; + unsigned long end_ptr, p; + int post; + unsigned long flags; + + spin_lock_irqsave(&dmap->lock,flags); + post= (dmap->flags & DMA_POST); + ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; + + dmap->flags &= ~DMA_POST; + dmap->cfrag = -1; + dmap->user_counter += l; + dmap->flags |= DMA_DIRTY; + + if (dmap->byte_counter >= dmap->max_byte_counter) { + /* Wrap the byte counters */ + long decr = dmap->byte_counter; + dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); + decr -= dmap->byte_counter; + dmap->user_counter -= decr; + } + end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; + + p = (dmap->user_counter - 1) % dmap->bytes_in_use; + dmap->neutral_byte = dmap->raw_buf[p]; + + /* Update the fragment based bookkeeping too */ + while (ptr < end_ptr) { + dmap->counts[dmap->qtail] = dmap->fragment_size; + dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; + dmap->qlen++; + ptr += dmap->fragment_size; + } + + dmap->counts[dmap->qtail] = dmap->user_counter - ptr; + + /* + * Let the low level driver perform some postprocessing to + * the written data. + */ + if (adev->d->postprocess_write) + adev->d->postprocess_write(dev); + + if (!(dmap->flags & DMA_ACTIVE)) + if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1))) + DMAbuf_launch_output(dev, dmap); + + spin_unlock_irqrestore(&dmap->lock,flags); + return 0; +} + +int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; + + if (dmap->raw_buf == NULL) { + printk(KERN_ERR "sound: DMA buffer(1) == NULL\n"); + printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in"); + return 0; + } + if (dmap->dma < 0) + return 0; + sound_start_dma(dmap, physaddr, count, dma_mode); + return count; +} +EXPORT_SYMBOL(DMAbuf_start_dma); + +static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode) +{ + struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; + + if (dmap->raw_buf == NULL) { + printk(KERN_ERR "sound: DMA buffer(2) == NULL\n"); + printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in"); + return 0; + } + if (dmap->flags & DMA_NODMA) + return 1; + if (dmap->dma < 0) + return 0; + sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT); + dmap->flags |= DMA_STARTED; + return count; +} + +static void finish_output_interrupt(int dev, struct dma_buffparms *dmap) +{ + struct audio_operations *adev = audio_devs[dev]; + + if (dmap->audio_callback != NULL) + dmap->audio_callback(dev, dmap->callback_parm); + wake_up(&adev->out_sleeper); + wake_up(&adev->poll_sleeper); +} +/* called with dmap->lock held in irq context*/ +static void do_outputintr(int dev, int dummy) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = adev->dmap_out; + int this_fragment; + + if (dmap->raw_buf == NULL) { + printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev); + return; + } + if (dmap->mapping_flags & DMA_MAP_MAPPED) { /* Virtual memory mapped access */ + /* mmapped access */ + dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; + if (dmap->qhead == 0) { /* Wrapped */ + dmap->byte_counter += dmap->bytes_in_use; + if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ + long decr = dmap->byte_counter; + dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); + decr -= dmap->byte_counter; + dmap->user_counter -= decr; + } + } + dmap->qlen++; /* Yes increment it (don't decrement) */ + if (!(adev->flags & DMA_AUTOMODE)) + dmap->flags &= ~DMA_ACTIVE; + dmap->counts[dmap->qhead] = dmap->fragment_size; + DMAbuf_launch_output(dev, dmap); + finish_output_interrupt(dev, dmap); + return; + } + + dmap->qlen--; + this_fragment = dmap->qhead; + dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; + + if (dmap->qhead == 0) { /* Wrapped */ + dmap->byte_counter += dmap->bytes_in_use; + if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ + long decr = dmap->byte_counter; + dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); + decr -= dmap->byte_counter; + dmap->user_counter -= decr; + } + } + if (!(adev->flags & DMA_AUTOMODE)) + dmap->flags &= ~DMA_ACTIVE; + + /* + * This is dmap->qlen <= 0 except when closing when + * dmap->qlen < 0 + */ + + while (dmap->qlen <= -dmap->closing) { + dmap->underrun_count++; + dmap->qlen++; + if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) { + dmap->flags &= ~DMA_DIRTY; + memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, + adev->dmap_out->buffsize); + } + dmap->user_counter += dmap->fragment_size; + dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; + } + if (dmap->qlen > 0) + DMAbuf_launch_output(dev, dmap); + finish_output_interrupt(dev, dmap); +} +/* called in irq context */ +void DMAbuf_outputintr(int dev, int notify_only) +{ + struct audio_operations *adev = audio_devs[dev]; + unsigned long flags; + struct dma_buffparms *dmap = adev->dmap_out; + + spin_lock_irqsave(&dmap->lock,flags); + if (!(dmap->flags & DMA_NODMA)) { + int chan = dmap->dma, pos, n; + unsigned long f; + + f=claim_dma_lock(); + + if(!isa_dma_bridge_buggy) + disable_dma(dmap->dma); + clear_dma_ff(chan); + pos = dmap->bytes_in_use - get_dma_residue(chan); + if(!isa_dma_bridge_buggy) + enable_dma(dmap->dma); + release_dma_lock(f); + + pos = pos / dmap->fragment_size; /* Actual qhead */ + if (pos < 0 || pos >= dmap->nbufs) + pos = 0; + n = 0; + while (dmap->qhead != pos && n++ < dmap->nbufs) + do_outputintr(dev, notify_only); + } + else + do_outputintr(dev, notify_only); + spin_unlock_irqrestore(&dmap->lock,flags); +} +EXPORT_SYMBOL(DMAbuf_outputintr); + +/* called with dmap->lock held in irq context */ +static void do_inputintr(int dev) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = adev->dmap_in; + + if (dmap->raw_buf == NULL) { + printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n"); + return; + } + if (dmap->mapping_flags & DMA_MAP_MAPPED) { + dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; + if (dmap->qtail == 0) { /* Wrapped */ + dmap->byte_counter += dmap->bytes_in_use; + if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ + long decr = dmap->byte_counter; + dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; + decr -= dmap->byte_counter; + dmap->user_counter -= decr; + } + } + dmap->qlen++; + + if (!(adev->flags & DMA_AUTOMODE)) { + if (dmap->needs_reorg) + reorganize_buffers(dev, dmap, 0); + local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ); + adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, + dmap->fragment_size, 1); + if (adev->d->trigger) + adev->d->trigger(dev, adev->enable_bits * adev->go); + } + dmap->flags |= DMA_ACTIVE; + } else if (dmap->qlen >= (dmap->nbufs - 1)) { + printk(KERN_WARNING "Sound: Recording overrun\n"); + dmap->underrun_count++; + + /* Just throw away the oldest fragment but keep the engine running */ + dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; + dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; + } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) { + dmap->qlen++; + dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; + if (dmap->qtail == 0) { /* Wrapped */ + dmap->byte_counter += dmap->bytes_in_use; + if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ + long decr = dmap->byte_counter; + dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; + decr -= dmap->byte_counter; + dmap->user_counter -= decr; + } + } + } + if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { + local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); + adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1); + if (adev->d->trigger) + adev->d->trigger(dev,adev->enable_bits * adev->go); + } + dmap->flags |= DMA_ACTIVE; + if (dmap->qlen > 0) + { + wake_up(&adev->in_sleeper); + wake_up(&adev->poll_sleeper); + } +} +/* called in irq context */ +void DMAbuf_inputintr(int dev) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = adev->dmap_in; + unsigned long flags; + + spin_lock_irqsave(&dmap->lock,flags); + + if (!(dmap->flags & DMA_NODMA)) { + int chan = dmap->dma, pos, n; + unsigned long f; + + f=claim_dma_lock(); + if(!isa_dma_bridge_buggy) + disable_dma(dmap->dma); + clear_dma_ff(chan); + pos = dmap->bytes_in_use - get_dma_residue(chan); + if(!isa_dma_bridge_buggy) + enable_dma(dmap->dma); + release_dma_lock(f); + + pos = pos / dmap->fragment_size; /* Actual qhead */ + if (pos < 0 || pos >= dmap->nbufs) + pos = 0; + + n = 0; + while (dmap->qtail != pos && ++n < dmap->nbufs) + do_inputintr(dev); + } else + do_inputintr(dev); + spin_unlock_irqrestore(&dmap->lock,flags); +} +EXPORT_SYMBOL(DMAbuf_inputintr); + +void DMAbuf_init(int dev, int dma1, int dma2) +{ + struct audio_operations *adev = audio_devs[dev]; + /* + * NOTE! This routine could be called several times. + */ + + if (adev && adev->dmap_out == NULL) { + if (adev->d == NULL) + panic("OSS: audio_devs[%d]->d == NULL\n", dev); + + if (adev->parent_dev) { /* Use DMA map of the parent dev */ + int parent = adev->parent_dev - 1; + adev->dmap_out = audio_devs[parent]->dmap_out; + adev->dmap_in = audio_devs[parent]->dmap_in; + } else { + adev->dmap_out = adev->dmap_in = &adev->dmaps[0]; + adev->dmap_out->dma = dma1; + if (adev->flags & DMA_DUPLEX) { + adev->dmap_in = &adev->dmaps[1]; + adev->dmap_in->dma = dma2; + } + } + /* Persistent DMA buffers allocated here */ + if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { + if (adev->dmap_in->raw_buf == NULL) + sound_alloc_dmap(adev->dmap_in); + if (adev->dmap_out->raw_buf == NULL) + sound_alloc_dmap(adev->dmap_out); + } + } +} + +/* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */ +static unsigned int poll_input(struct file * file, int dev, poll_table *wait) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = adev->dmap_in; + + if (!(adev->open_mode & OPEN_READ)) + return 0; + if (dmap->mapping_flags & DMA_MAP_MAPPED) { + if (dmap->qlen) + return POLLIN | POLLRDNORM; + return 0; + } + if (dmap->dma_mode != DMODE_INPUT) { + if (dmap->dma_mode == DMODE_NONE && + adev->enable_bits & PCM_ENABLE_INPUT && + !dmap->qlen && adev->go) { + unsigned long flags; + + spin_lock_irqsave(&dmap->lock,flags); + DMAbuf_activate_recording(dev, dmap); + spin_unlock_irqrestore(&dmap->lock,flags); + } + return 0; + } + if (!dmap->qlen) + return 0; + return POLLIN | POLLRDNORM; +} + +static unsigned int poll_output(struct file * file, int dev, poll_table *wait) +{ + struct audio_operations *adev = audio_devs[dev]; + struct dma_buffparms *dmap = adev->dmap_out; + + if (!(adev->open_mode & OPEN_WRITE)) + return 0; + if (dmap->mapping_flags & DMA_MAP_MAPPED) { + if (dmap->qlen) + return POLLOUT | POLLWRNORM; + return 0; + } + if (dmap->dma_mode == DMODE_INPUT) + return 0; + if (dmap->dma_mode == DMODE_NONE) + return POLLOUT | POLLWRNORM; + if (!DMAbuf_space_in_queue(dev)) + return 0; + return POLLOUT | POLLWRNORM; +} + +unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait) +{ + struct audio_operations *adev = audio_devs[dev]; + poll_wait(file, &adev->poll_sleeper, wait); + return poll_input(file, dev, wait) | poll_output(file, dev, wait); +} + +void DMAbuf_deinit(int dev) +{ + struct audio_operations *adev = audio_devs[dev]; + /* This routine is called when driver is being unloaded */ + if (!adev) + return; + + /* Persistent DMA buffers deallocated here */ + if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { + sound_free_dmap(adev->dmap_out); + if (adev->flags & DMA_DUPLEX) + sound_free_dmap(adev->dmap_in); + } +} |
