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ALSA: asihpi: MMAP for non-busmaster cards
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Allow older non DMA capable cards to use MMAP by
emulating the DMA using read and write functions,
and getting rid of copy & silence callbacks that
were used only by older cards.

Signed-off-by: Eliot Blennerhassett <eblennerhassett@audioscience.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Eliot Blennerhassett authored and Takashi Iwai committed Apr 5, 2011
1 parent 0b7ce9e commit f3d145a
Showing 1 changed file with 70 additions and 135 deletions.
205 changes: 70 additions & 135 deletions sound/pci/asihpi/asihpi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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");
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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) {
Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -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;

Expand Down Expand Up @@ -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) {
Expand Down Expand Up @@ -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);
}
Expand Down Expand Up @@ -1004,19 +1039,17 @@ 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;

/* 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)
Expand Down Expand Up @@ -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,
Expand Down Expand Up @@ -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)
Expand All @@ -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,
Expand All @@ -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)
{
Expand All @@ -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;
Expand Down Expand Up @@ -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));

Expand All @@ -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
);
Expand Down Expand Up @@ -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",
Expand Down

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