diff options
Diffstat (limited to 'sound/oss/dmabuf.c')
| -rw-r--r-- | sound/oss/dmabuf.c | 1268 |
1 files changed, 0 insertions, 1268 deletions
diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c deleted file mode 100644 index c5dd396c66a2..000000000000 --- a/sound/oss/dmabuf.c +++ /dev/null @@ -1,1268 +0,0 @@ -/* - * 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 <linux/gfp.h> -#include <linux/sched/signal.h> - -#include "sound_config.h" -#include "sleep.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 = dma_map_single(NULL, start_addr, dmap->buffsize, DMA_BIDIRECTIONAL); - - 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); - - dma_unmap_single(NULL, dmap->raw_buf_phys, dmap->buffsize, DMA_BIDIRECTIONAL); - 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); - oss_broken_sleep_on(&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 = oss_broken_sleep_on(&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); - oss_broken_sleep_on(&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; - - 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 (adev->go) - timeout = dmabuf_timeout(dmap); - - spin_unlock_irqrestore(&dmap->lock,flags); - timeout = oss_broken_sleep_on(&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 = oss_broken_sleep_on(&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); - } -} |