[alsa-devel] [snd-asihpi 4/8] Allow older non DMA capable cards to use MMAP. Emulate the DMA using read and write functions, get rid of copy & silence callbacks that were used only by older cards.

From: Eliot Blennerhassett eblennerhassett@audioscience.com

Signed-off-by: Eliot Blennerhassett eblennerhassett@audioscience.com --- pci/asihpi/asihpi.c | 205 +++++++++++++++++--------------------------------- 1 files changed, 70 insertions(+), 135 deletions(-)

diff --git a/pci/asihpi/asihpi.c b/pci/asihpi/asihpi.c index a5226e3..d5258aa 100644 --- a/pci/asihpi/asihpi.c +++ b/pci/asihpi/asihpi.c @@ -42,6 +42,7 @@ #include <sound/tlv.h> #include <sound/hwdep.h>

+ MODULE_LICENSE("GPL"); MODULE_AUTHOR("AudioScience inc. support@audioscience.com"); MODULE_DESCRIPTION("AudioScience ALSA ASI5000 ASI6000 ASI87xx ASI89xx"); @@ -146,7 +147,7 @@ struct snd_card_asihpi { u32 h_mixer; struct clk_cache cc;

- u16 support_mmap; + u16 can_dma; u16 support_grouping; u16 support_mrx; u16 update_interval_frames; @@ -491,8 +492,7 @@ static int snd_card_asihpi_pcm_hw_params(struct snd_pcm_substream *substream, }

dpcm->hpi_buffer_attached = 0; - if (card->support_mmap) { - + if (card->can_dma) { err = hpi_stream_host_buffer_attach(dpcm->h_stream, params_buffer_bytes(params), runtime->dma_addr); if (err == 0) { @@ -594,8 +594,7 @@ static int snd_card_asihpi_trigger(struct snd_pcm_substream *substream, continue;

ds->drained_count = 0; - if ((s->stream == SNDRV_PCM_STREAM_PLAYBACK) && - (card->support_mmap)) { + if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) { /* How do I know how much valid data is present * in buffer? Must be at least one period! * Guessing 2 periods, but if @@ -630,7 +629,7 @@ static int snd_card_asihpi_trigger(struct snd_pcm_substream *substream, /* start the master stream */ snd_card_asihpi_pcm_timer_start(substream); if ((substream->stream == SNDRV_PCM_STREAM_CAPTURE) || - !card->support_mmap) + !card->can_dma) hpi_handle_error(hpi_stream_start(dpcm->h_stream)); break;

@@ -766,6 +765,9 @@ static void snd_card_asihpi_timer_function(unsigned long data) /* number of bytes in on-card buffer */ runtime->delay = on_card_bytes;

+ if (!card->can_dma) + on_card_bytes = bytes_avail; + if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) { pcm_buf_dma_ofs = ds->pcm_buf_host_rw_ofs - bytes_avail; if (state == HPI_STATE_STOPPED) { @@ -844,30 +846,63 @@ static void snd_card_asihpi_timer_function(unsigned long data)

ds->pcm_buf_dma_ofs = pcm_buf_dma_ofs;

- if (xfercount && (on_card_bytes <= ds->period_bytes)) { - if (card->support_mmap) { - if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) { - snd_printddd("P%d write x%04x\n", + if (xfercount && + /* Limit use of on card fifo for playback */ + ((on_card_bytes <= ds->period_bytes) || + (s->stream == SNDRV_PCM_STREAM_CAPTURE))) + + { + + unsigned int buf_ofs = ds->pcm_buf_host_rw_ofs % ds->buffer_bytes; + unsigned int xfer1, xfer2; + char *pd = &s->runtime->dma_area[buf_ofs]; + + if (card->can_dma) { + xfer1 = xfercount; + xfer2 = 0; + } else { + xfer1 = min(xfercount, ds->buffer_bytes - buf_ofs); + xfer2 = xfercount - xfer1; + } + + if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) { + snd_printddd("P%d write1 0x%04X 0x%04X\n", + s->number, xfer1, buf_ofs); + hpi_handle_error( + hpi_outstream_write_buf( + ds->h_stream, pd, xfer1, + &ds->format)); + + if (xfer2) { + pd = s->runtime->dma_area; + + snd_printddd("P%d write2 0x%04X 0x%04X\n", s->number, - ds->period_bytes); + xfercount - xfer1, buf_ofs); hpi_handle_error( hpi_outstream_write_buf( - ds->h_stream, - &s->runtime-> - dma_area[0], - xfercount, + ds->h_stream, pd, + xfercount - xfer1, &ds->format)); - } else { - snd_printddd("C%d read x%04x\n", - s->number, - xfercount); + } + } else { + snd_printddd("C%d read1 0x%04x\n", + s->number, xfer1); + hpi_handle_error( + hpi_instream_read_buf( + ds->h_stream, + pd, xfer1)); + if (xfer2) { + pd = s->runtime->dma_area; + snd_printddd("C%d read2 0x%04x\n", + s->number, xfer2); hpi_handle_error( hpi_instream_read_buf( ds->h_stream, - NULL, xfercount)); + pd, xfer2)); } - ds->pcm_buf_host_rw_ofs = ds->pcm_buf_host_rw_ofs + xfercount; - } /* else R/W will be handled by read/write callbacks */ + } + ds->pcm_buf_host_rw_ofs = ds->pcm_buf_host_rw_ofs + xfercount; ds->pcm_buf_elapsed_dma_ofs = pcm_buf_dma_ofs; snd_pcm_period_elapsed(s); } @@ -1004,11 +1039,9 @@ static int snd_card_asihpi_playback_open(struct snd_pcm_substream *substream) SNDRV_PCM_INFO_DOUBLE | SNDRV_PCM_INFO_BATCH | SNDRV_PCM_INFO_BLOCK_TRANSFER | - SNDRV_PCM_INFO_PAUSE; - - if (card->support_mmap) - snd_card_asihpi_playback.info |= SNDRV_PCM_INFO_MMAP | - SNDRV_PCM_INFO_MMAP_VALID; + SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID;

if (card->support_grouping) snd_card_asihpi_playback.info |= SNDRV_PCM_INFO_SYNC_START; @@ -1016,7 +1049,7 @@ static int snd_card_asihpi_playback_open(struct snd_pcm_substream *substream) /* struct is copied, so can create initializer dynamically */ runtime->hw = snd_card_asihpi_playback;

- if (card->support_mmap) + if (card->can_dma) err = snd_pcm_hw_constraint_pow2(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES); if (err < 0) @@ -1046,58 +1079,6 @@ static int snd_card_asihpi_playback_close(struct snd_pcm_substream *substream) return 0; }

-static int snd_card_asihpi_playback_copy(struct snd_pcm_substream *substream, - int channel, - snd_pcm_uframes_t pos, - void __user *src, - snd_pcm_uframes_t count) -{ - struct snd_pcm_runtime *runtime = substream->runtime; - struct snd_card_asihpi_pcm *dpcm = runtime->private_data; - unsigned int len; - - len = frames_to_bytes(runtime, count); - - if (copy_from_user(runtime->dma_area, src, len)) - return -EFAULT; - - snd_printddd("playback copy%d %u bytes\n", - substream->number, len); - - hpi_handle_error(hpi_outstream_write_buf(dpcm->h_stream, - runtime->dma_area, len, &dpcm->format)); - - dpcm->pcm_buf_host_rw_ofs += len; - - return 0; -} - -static int snd_card_asihpi_playback_silence(struct snd_pcm_substream * - substream, int channel, - snd_pcm_uframes_t pos, - snd_pcm_uframes_t count) -{ - /* Usually writes silence to DMA buffer, which should be overwritten - by real audio later. Our fifos cannot be overwritten, and are not - free-running DMAs. Silence is output on fifo underflow. - This callback is still required to allow the copy callback to be used. - */ - return 0; -} - -static struct snd_pcm_ops snd_card_asihpi_playback_ops = { - .open = snd_card_asihpi_playback_open, - .close = snd_card_asihpi_playback_close, - .ioctl = snd_card_asihpi_playback_ioctl, - .hw_params = snd_card_asihpi_pcm_hw_params, - .hw_free = snd_card_asihpi_hw_free, - .prepare = snd_card_asihpi_playback_prepare, - .trigger = snd_card_asihpi_trigger, - .pointer = snd_card_asihpi_playback_pointer, - .copy = snd_card_asihpi_playback_copy, - .silence = snd_card_asihpi_playback_silence, -}; - static struct snd_pcm_ops snd_card_asihpi_playback_mmap_ops = { .open = snd_card_asihpi_playback_open, .close = snd_card_asihpi_playback_close, @@ -1229,18 +1210,16 @@ static int snd_card_asihpi_capture_open(struct snd_pcm_substream *substream) snd_card_asihpi_capture_format(card, dpcm->h_stream, &snd_card_asihpi_capture); snd_card_asihpi_pcm_samplerates(card, &snd_card_asihpi_capture); - snd_card_asihpi_capture.info = SNDRV_PCM_INFO_INTERLEAVED; - - if (card->support_mmap) - snd_card_asihpi_capture.info |= SNDRV_PCM_INFO_MMAP | - SNDRV_PCM_INFO_MMAP_VALID; + snd_card_asihpi_capture.info = SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID;

if (card->support_grouping) snd_card_asihpi_capture.info |= SNDRV_PCM_INFO_SYNC_START;

runtime->hw = snd_card_asihpi_capture;

- if (card->support_mmap) + if (card->can_dma) err = snd_pcm_hw_constraint_pow2(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES); if (err < 0) @@ -1264,28 +1243,6 @@ static int snd_card_asihpi_capture_close(struct snd_pcm_substream *substream) return 0; }

-static int snd_card_asihpi_capture_copy(struct snd_pcm_substream *substream, - int channel, snd_pcm_uframes_t pos, - void __user *dst, snd_pcm_uframes_t count) -{ - struct snd_pcm_runtime *runtime = substream->runtime; - struct snd_card_asihpi_pcm *dpcm = runtime->private_data; - u32 len; - - len = frames_to_bytes(runtime, count); - - snd_printddd("capture copy%d %d bytes\n", substream->number, len); - hpi_handle_error(hpi_instream_read_buf(dpcm->h_stream, - runtime->dma_area, len)); - - dpcm->pcm_buf_host_rw_ofs = dpcm->pcm_buf_host_rw_ofs + len; - - if (copy_to_user(dst, runtime->dma_area, len)) - return -EFAULT; - - return 0; -} - static struct snd_pcm_ops snd_card_asihpi_capture_mmap_ops = { .open = snd_card_asihpi_capture_open, .close = snd_card_asihpi_capture_close, @@ -1297,18 +1254,6 @@ static struct snd_pcm_ops snd_card_asihpi_capture_mmap_ops = { .pointer = snd_card_asihpi_capture_pointer, };

-static struct snd_pcm_ops snd_card_asihpi_capture_ops = { - .open = snd_card_asihpi_capture_open, - .close = snd_card_asihpi_capture_close, - .ioctl = snd_card_asihpi_capture_ioctl, - .hw_params = snd_card_asihpi_pcm_hw_params, - .hw_free = snd_card_asihpi_hw_free, - .prepare = snd_card_asihpi_capture_prepare, - .trigger = snd_card_asihpi_trigger, - .pointer = snd_card_asihpi_capture_pointer, - .copy = snd_card_asihpi_capture_copy -}; - static int __devinit snd_card_asihpi_pcm_new(struct snd_card_asihpi *asihpi, int device, int substreams) { @@ -1321,17 +1266,10 @@ static int __devinit snd_card_asihpi_pcm_new(struct snd_card_asihpi *asihpi, if (err < 0) return err; /* pointer to ops struct is stored, dont change ops afterwards! */ - if (asihpi->support_mmap) { snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_asihpi_playback_mmap_ops); snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_asihpi_capture_mmap_ops); - } else { - snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, - &snd_card_asihpi_playback_ops); - snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, - &snd_card_asihpi_capture_ops); - }

pcm->private_data = asihpi; pcm->info_flags = 0; @@ -2895,14 +2833,14 @@ static int __devinit snd_asihpi_probe(struct pci_dev *pci_dev, if (err) asihpi->update_interval_frames = 512;

- if (!asihpi->support_mmap) + if (!asihpi->can_dma) asihpi->update_interval_frames *= 2;

hpi_handle_error(hpi_instream_open(asihpi->adapter_index, 0, &h_stream));

err = hpi_instream_host_buffer_free(h_stream); - asihpi->support_mmap = (!err); + asihpi->can_dma = (!err);

hpi_handle_error(hpi_instream_close(h_stream));

@@ -2914,8 +2852,8 @@ static int __devinit snd_asihpi_probe(struct pci_dev *pci_dev, asihpi->out_max_chans = 2; }

- snd_printk(KERN_INFO "supports mmap:%d grouping:%d mrx:%d\n", - asihpi->support_mmap, + snd_printk(KERN_INFO "has dma:%d, grouping:%d, mrx:%d\n", + asihpi->can_dma, asihpi->support_grouping, asihpi->support_mrx ); @@ -2945,10 +2883,7 @@ static int __devinit snd_asihpi_probe(struct pci_dev *pci_dev, by enable_hwdep module param*/ snd_asihpi_hpi_new(asihpi, 0, NULL);

- if (asihpi->support_mmap) - strcpy(card->driver, "ASIHPI-MMAP"); - else - strcpy(card->driver, "ASIHPI"); + strcpy(card->driver, "ASIHPI");

sprintf(card->shortname, "AudioScience ASI%4X", asihpi->type); sprintf(card->longname, "%s %i",