[alsa-devel] [[PATCH] snd-asihpi: 4/8] MMAP for non-busmaster cards
linux at audioscience.com
linux at audioscience.com
Tue Apr 5 10:55:44 CEST 2011
From: Eliot Blennerhassett <eblennerhassett at audioscience.com>
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 at 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 at 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",
--
1.7.0.4
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