[ALSA] Xilinx ML403 AC97 Controller Reference device driver
Add ALSA support for the opb_ac97_controller_ref_v1_00_a ip core found in Xilinx' ML403 reference design. Known issue: Currently this driver hits a WARN_ON_ONCE(1) statement in kernel/irq/resend.c (line 70). According to Linus (http://lkml.org/lkml/2007/8/5/5) this may be ignored, right? I haven't had a look into this 'problem' yet. Signed-off-by: Joachim Foerster <JOFT@gmx.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Joachim Foerster
Jaroslav Kysela
Родитель
f1f208d0b4
Коммит
a9f00d8df2
|
|
@ -120,4 +120,16 @@ config SND_PORTMAN2X4
|
|||
To compile this driver as a module, choose M here: the module
|
||||
will be called snd-portman2x4.
|
||||
|
||||
config SND_ML403_AC97CR
|
||||
tristate "Xilinx ML403 AC97 Controller Reference"
|
||||
depends on SND && XILINX_VIRTEX
|
||||
select SND_AC97_CODEC
|
||||
help
|
||||
Say Y here to include support for the
|
||||
opb_ac97_controller_ref_v1_00_a ip core found in Xilinx' ML403
|
||||
reference design.
|
||||
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called snd-ml403_ac97cr.
|
||||
|
||||
endmenu
|
||||
|
|
|
|||
|
|
@ -9,6 +9,7 @@ snd-mts64-objs := mts64.o
|
|||
snd-portman2x4-objs := portman2x4.o
|
||||
snd-serial-u16550-objs := serial-u16550.o
|
||||
snd-virmidi-objs := virmidi.o
|
||||
snd-ml403-ac97cr-objs := ml403-ac97cr.o pcm-indirect2.o
|
||||
|
||||
# Toplevel Module Dependency
|
||||
obj-$(CONFIG_SND_DUMMY) += snd-dummy.o
|
||||
|
|
@ -17,5 +18,6 @@ obj-$(CONFIG_SND_SERIAL_U16550) += snd-serial-u16550.o
|
|||
obj-$(CONFIG_SND_MTPAV) += snd-mtpav.o
|
||||
obj-$(CONFIG_SND_MTS64) += snd-mts64.o
|
||||
obj-$(CONFIG_SND_PORTMAN2X4) += snd-portman2x4.o
|
||||
obj-$(CONFIG_SND_ML403_AC97CR) += snd-ml403-ac97cr.o
|
||||
|
||||
obj-$(CONFIG_SND) += opl3/ opl4/ mpu401/ vx/
|
||||
|
|
|
|||
Разница между файлами не показана из-за своего большого размера
Загрузить разницу
|
|
@ -0,0 +1,591 @@
|
|||
/*
|
||||
* Helper functions for indirect PCM data transfer to a simple FIFO in
|
||||
* hardware (small, no possibility to read "hardware io position",
|
||||
* updating position done by interrupt, ...)
|
||||
*
|
||||
* Copyright (c) by 2007 Joachim Foerster <JOFT@gmx.de>
|
||||
*
|
||||
* Based on "pcm-indirect.h" (alsa-driver-1.0.13) by
|
||||
*
|
||||
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
|
||||
* Jaroslav Kysela <perex@suse.cz>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
/* #dependency of sound/core.h# */
|
||||
#include <sound/driver.h>
|
||||
/* snd_printk/d() */
|
||||
#include <sound/core.h>
|
||||
/* struct snd_pcm_substream, struct snd_pcm_runtime, snd_pcm_uframes_t
|
||||
* snd_pcm_period_elapsed() */
|
||||
#include <sound/pcm.h>
|
||||
|
||||
#include "pcm-indirect2.h"
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
/* jiffies */
|
||||
#include <linux/jiffies.h>
|
||||
|
||||
void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
int i;
|
||||
int j;
|
||||
int k;
|
||||
int seconds = (rec->lastbytetime - rec->firstbytetime) / HZ;
|
||||
|
||||
snd_printk(KERN_DEBUG "STAT: mul_elapsed: %u, mul_elapsed_real: %d, "
|
||||
"irq_occured: %d\n",
|
||||
rec->mul_elapsed, rec->mul_elapsed_real, rec->irq_occured);
|
||||
snd_printk(KERN_DEBUG "STAT: min_multiple: %d (irqs/period)\n",
|
||||
rec->min_multiple);
|
||||
snd_printk(KERN_DEBUG "STAT: firstbytetime: %lu, lastbytetime: %lu, "
|
||||
"firstzerotime: %lu\n",
|
||||
rec->firstbytetime, rec->lastbytetime, rec->firstzerotime);
|
||||
snd_printk(KERN_DEBUG "STAT: bytes2hw: %u Bytes => (by runtime->rate) "
|
||||
"length: %d s\n",
|
||||
rec->bytes2hw, rec->bytes2hw / 2 / 2 / runtime->rate);
|
||||
snd_printk(KERN_DEBUG "STAT: (by measurement) length: %d => "
|
||||
"rate: %d Bytes/s = %d Frames/s|Hz\n",
|
||||
seconds, rec->bytes2hw / seconds,
|
||||
rec->bytes2hw / 2 / 2 / seconds);
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: zeros2hw: %u = %d ms ~ %d * %d zero copies\n",
|
||||
rec->zeros2hw, ((rec->zeros2hw / 2 / 2) * 1000) /
|
||||
runtime->rate,
|
||||
rec->zeros2hw / (rec->hw_buffer_size / 2),
|
||||
(rec->hw_buffer_size / 2));
|
||||
snd_printk(KERN_DEBUG "STAT: pointer_calls: %u, lastdifftime: %u\n",
|
||||
rec->pointer_calls, rec->lastdifftime);
|
||||
snd_printk(KERN_DEBUG "STAT: sw_io: %d, sw_data: %d\n", rec->sw_io,
|
||||
rec->sw_data);
|
||||
snd_printk(KERN_DEBUG "STAT: byte_sizes[]:\n");
|
||||
k = 0;
|
||||
for (j = 0; j < 8; j++) {
|
||||
for (i = j * 8; i < (j + 1) * 8; i++)
|
||||
if (rec->byte_sizes[i] != 0) {
|
||||
snd_printk(KERN_DEBUG "%u: %u",
|
||||
i, rec->byte_sizes[i]);
|
||||
k++;
|
||||
}
|
||||
if (((k % 8) == 0) && (k != 0)) {
|
||||
snd_printk(KERN_DEBUG "\n");
|
||||
k = 0;
|
||||
}
|
||||
}
|
||||
snd_printk(KERN_DEBUG "\n");
|
||||
snd_printk(KERN_DEBUG "STAT: zero_sizes[]:\n");
|
||||
for (j = 0; j < 8; j++) {
|
||||
k = 0;
|
||||
for (i = j * 8; i < (j + 1) * 8; i++)
|
||||
if (rec->zero_sizes[i] != 0)
|
||||
snd_printk(KERN_DEBUG "%u: %u",
|
||||
i, rec->zero_sizes[i]);
|
||||
else
|
||||
k++;
|
||||
if (!k)
|
||||
snd_printk(KERN_DEBUG "\n");
|
||||
}
|
||||
snd_printk(KERN_DEBUG "\n");
|
||||
snd_printk(KERN_DEBUG "STAT: min_adds[]:\n");
|
||||
for (j = 0; j < 8; j++) {
|
||||
if (rec->min_adds[j] != 0)
|
||||
snd_printk(KERN_DEBUG "%u: %u", j, rec->min_adds[j]);
|
||||
}
|
||||
snd_printk(KERN_DEBUG "\n");
|
||||
snd_printk(KERN_DEBUG "STAT: mul_adds[]:\n");
|
||||
for (j = 0; j < 8; j++) {
|
||||
if (rec->mul_adds[j] != 0)
|
||||
snd_printk(KERN_DEBUG "%u: %u", j, rec->mul_adds[j]);
|
||||
}
|
||||
snd_printk(KERN_DEBUG "\n");
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: zero_times_saved: %d, zero_times_notsaved: %d\n",
|
||||
rec->zero_times_saved, rec->zero_times_notsaved);
|
||||
/* snd_printk(KERN_DEBUG "STAT: zero_times[]\n");
|
||||
i = 0;
|
||||
for (j = 0; j < 3750; j++) {
|
||||
if (rec->zero_times[j] != 0) {
|
||||
snd_printk(KERN_DEBUG "%u: %u", j, rec->zero_times[j]);
|
||||
i++;
|
||||
}
|
||||
if (((i % 8) == 0) && (i != 0))
|
||||
snd_printk(KERN_DEBUG "\n");
|
||||
}
|
||||
snd_printk(KERN_DEBUG "\n"); */
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* _internal_ helper function for playback/capture transfer function
|
||||
*/
|
||||
static void
|
||||
snd_pcm_indirect2_increase_min_periods(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec,
|
||||
int isplay, int iscopy,
|
||||
unsigned int bytes)
|
||||
{
|
||||
if (rec->min_periods >= 0) {
|
||||
if (iscopy) {
|
||||
rec->sw_io += bytes;
|
||||
if (rec->sw_io >= rec->sw_buffer_size)
|
||||
rec->sw_io -= rec->sw_buffer_size;
|
||||
} else if (isplay) {
|
||||
/* If application does not write data in multiples of
|
||||
* a period, move sw_data to the next correctly aligned
|
||||
* position, so that sw_io can converge to it (in the
|
||||
* next step).
|
||||
*/
|
||||
if (!rec->check_alignment) {
|
||||
if (rec->bytes2hw %
|
||||
snd_pcm_lib_period_bytes(substream)) {
|
||||
unsigned bytes2hw_aligned =
|
||||
(1 +
|
||||
(rec->bytes2hw /
|
||||
snd_pcm_lib_period_bytes
|
||||
(substream))) *
|
||||
snd_pcm_lib_period_bytes
|
||||
(substream);
|
||||
rec->sw_data =
|
||||
bytes2hw_aligned %
|
||||
rec->sw_buffer_size;
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: @re-align: aligned "
|
||||
"bytes2hw to next period "
|
||||
"size boundary: %d "
|
||||
"(instead of %d)\n",
|
||||
bytes2hw_aligned,
|
||||
rec->bytes2hw);
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: @re-align: sw_data "
|
||||
"moves to: %d\n",
|
||||
rec->sw_data);
|
||||
#endif
|
||||
}
|
||||
rec->check_alignment = 1;
|
||||
}
|
||||
/* We are at the end and are copying zeros into the
|
||||
* fifo.
|
||||
* Now, we have to make sure that sw_io is increased
|
||||
* until the position of sw_data: Filling the fifo with
|
||||
* the first zeros means, the last bytes were played.
|
||||
*/
|
||||
if (rec->sw_io != rec->sw_data) {
|
||||
unsigned int diff;
|
||||
if (rec->sw_data > rec->sw_io)
|
||||
diff = rec->sw_data - rec->sw_io;
|
||||
else
|
||||
diff = (rec->sw_buffer_size -
|
||||
rec->sw_io) +
|
||||
rec->sw_data;
|
||||
if (bytes >= diff)
|
||||
rec->sw_io = rec->sw_data;
|
||||
else {
|
||||
rec->sw_io += bytes;
|
||||
if (rec->sw_io >= rec->sw_buffer_size)
|
||||
rec->sw_io -=
|
||||
rec->sw_buffer_size;
|
||||
}
|
||||
}
|
||||
}
|
||||
rec->min_period_count += bytes;
|
||||
if (rec->min_period_count >= (rec->hw_buffer_size / 2)) {
|
||||
rec->min_periods += (rec->min_period_count /
|
||||
(rec->hw_buffer_size / 2));
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if ((rec->min_period_count /
|
||||
(rec->hw_buffer_size / 2)) > 7)
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: more than 7 (%d) min_adds "
|
||||
"at once - too big to save!\n",
|
||||
(rec->min_period_count /
|
||||
(rec->hw_buffer_size / 2)));
|
||||
else
|
||||
rec->min_adds[(rec->min_period_count /
|
||||
(rec->hw_buffer_size / 2))]++;
|
||||
#endif
|
||||
rec->min_period_count = (rec->min_period_count %
|
||||
(rec->hw_buffer_size / 2));
|
||||
}
|
||||
} else if (isplay && iscopy)
|
||||
rec->min_periods = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* helper function for playback/capture pointer callback
|
||||
*/
|
||||
snd_pcm_uframes_t
|
||||
snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec)
|
||||
{
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
rec->pointer_calls++;
|
||||
#endif
|
||||
return bytes_to_frames(substream->runtime, rec->sw_io);
|
||||
}
|
||||
|
||||
/*
|
||||
* _internal_ helper function for playback interrupt callback
|
||||
*/
|
||||
static void
|
||||
snd_pcm_indirect2_playback_transfer(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec,
|
||||
snd_pcm_indirect2_copy_t copy,
|
||||
snd_pcm_indirect2_zero_t zero)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
|
||||
|
||||
/* runtime->control->appl_ptr: position where ALSA will write next time
|
||||
* rec->appl_ptr: position where ALSA was last time
|
||||
* diff: obviously ALSA wrote that much bytes into the intermediate
|
||||
* buffer since we checked last time
|
||||
*/
|
||||
snd_pcm_sframes_t diff = appl_ptr - rec->appl_ptr;
|
||||
|
||||
if (diff) {
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
rec->lastdifftime = jiffies;
|
||||
#endif
|
||||
if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
|
||||
diff += runtime->boundary;
|
||||
/* number of bytes "added" by ALSA increases the number of
|
||||
* bytes which are ready to "be transfered to HW"/"played"
|
||||
* Then, set rec->appl_ptr to not count bytes twice next time.
|
||||
*/
|
||||
rec->sw_ready += (int)frames_to_bytes(runtime, diff);
|
||||
rec->appl_ptr = appl_ptr;
|
||||
}
|
||||
if (rec->hw_ready && (rec->sw_ready <= 0)) {
|
||||
unsigned int bytes;
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if (rec->firstzerotime == 0) {
|
||||
rec->firstzerotime = jiffies;
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: @firstzerotime: mul_elapsed: %d, "
|
||||
"min_period_count: %d\n",
|
||||
rec->mul_elapsed, rec->min_period_count);
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: @firstzerotime: sw_io: %d, "
|
||||
"sw_data: %d, appl_ptr: %u\n",
|
||||
rec->sw_io, rec->sw_data,
|
||||
(unsigned int)appl_ptr);
|
||||
}
|
||||
if ((jiffies - rec->firstzerotime) < 3750) {
|
||||
rec->zero_times[(jiffies - rec->firstzerotime)]++;
|
||||
rec->zero_times_saved++;
|
||||
} else
|
||||
rec->zero_times_notsaved++;
|
||||
#endif
|
||||
bytes = zero(substream, rec);
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
rec->zeros2hw += bytes;
|
||||
if (bytes < 64)
|
||||
rec->zero_sizes[bytes]++;
|
||||
else
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: %d zero Bytes copied to hardware at "
|
||||
"once - too big to save!\n",
|
||||
bytes);
|
||||
#endif
|
||||
snd_pcm_indirect2_increase_min_periods(substream, rec, 1, 0,
|
||||
bytes);
|
||||
return;
|
||||
}
|
||||
while (rec->hw_ready && (rec->sw_ready > 0)) {
|
||||
/* sw_to_end: max. number of bytes that can be read/take from
|
||||
* the current position (sw_data) in _one_ step
|
||||
*/
|
||||
unsigned int sw_to_end = rec->sw_buffer_size - rec->sw_data;
|
||||
|
||||
/* bytes: number of bytes we have available (for reading) */
|
||||
unsigned int bytes = rec->sw_ready;
|
||||
|
||||
if (sw_to_end < bytes)
|
||||
bytes = sw_to_end;
|
||||
if (!bytes)
|
||||
break;
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if (rec->firstbytetime == 0)
|
||||
rec->firstbytetime = jiffies;
|
||||
rec->lastbytetime = jiffies;
|
||||
#endif
|
||||
/* copy bytes from intermediate buffer position sw_data to the
|
||||
* HW and return number of bytes actually written
|
||||
* Furthermore, set hw_ready to 0, if the fifo isn't empty
|
||||
* now => more could be transfered to fifo
|
||||
*/
|
||||
bytes = copy(substream, rec, bytes);
|
||||
rec->bytes2hw += bytes;
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if (bytes < 64)
|
||||
rec->byte_sizes[bytes]++;
|
||||
else
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: %d Bytes copied to hardware at once "
|
||||
"- too big to save!\n",
|
||||
bytes);
|
||||
#endif
|
||||
/* increase sw_data by the number of actually written bytes
|
||||
* (= number of taken bytes from intermediate buffer)
|
||||
*/
|
||||
rec->sw_data += bytes;
|
||||
if (rec->sw_data == rec->sw_buffer_size)
|
||||
rec->sw_data = 0;
|
||||
/* now sw_data is the position where ALSA is going to write
|
||||
* in the intermediate buffer next time = position we are going
|
||||
* to read from next time
|
||||
*/
|
||||
|
||||
snd_pcm_indirect2_increase_min_periods(substream, rec, 1, 1,
|
||||
bytes);
|
||||
|
||||
/* we read bytes from intermediate buffer, so we need to say
|
||||
* that the number of bytes ready for transfer are decreased
|
||||
* now
|
||||
*/
|
||||
rec->sw_ready -= bytes;
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* helper function for playback interrupt routine
|
||||
*/
|
||||
void
|
||||
snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec,
|
||||
snd_pcm_indirect2_copy_t copy,
|
||||
snd_pcm_indirect2_zero_t zero)
|
||||
{
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
rec->irq_occured++;
|
||||
#endif
|
||||
/* hardware played some bytes, so there is room again (in fifo) */
|
||||
rec->hw_ready = 1;
|
||||
|
||||
/* don't call ack() now, instead call transfer() function directly
|
||||
* (normally called by ack() )
|
||||
*/
|
||||
snd_pcm_indirect2_playback_transfer(substream, rec, copy, zero);
|
||||
|
||||
if (rec->min_periods >= rec->min_multiple) {
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if ((rec->min_periods / rec->min_multiple) > 7)
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: more than 7 (%d) mul_adds - too big "
|
||||
"to save!\n",
|
||||
(rec->min_periods / rec->min_multiple));
|
||||
else
|
||||
rec->mul_adds[(rec->min_periods /
|
||||
rec->min_multiple)]++;
|
||||
rec->mul_elapsed_real += (rec->min_periods /
|
||||
rec->min_multiple);
|
||||
rec->mul_elapsed++;
|
||||
#endif
|
||||
rec->min_periods = 0;
|
||||
snd_pcm_period_elapsed(substream);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* _internal_ helper function for capture interrupt callback
|
||||
*/
|
||||
static void
|
||||
snd_pcm_indirect2_capture_transfer(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec,
|
||||
snd_pcm_indirect2_copy_t copy,
|
||||
snd_pcm_indirect2_zero_t null)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
|
||||
snd_pcm_sframes_t diff = appl_ptr - rec->appl_ptr;
|
||||
|
||||
if (diff) {
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
rec->lastdifftime = jiffies;
|
||||
#endif
|
||||
if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
|
||||
diff += runtime->boundary;
|
||||
rec->sw_ready -= frames_to_bytes(runtime, diff);
|
||||
rec->appl_ptr = appl_ptr;
|
||||
}
|
||||
/* if hardware has something, but the intermediate buffer is full
|
||||
* => skip contents of buffer
|
||||
*/
|
||||
if (rec->hw_ready && (rec->sw_ready >= (int)rec->sw_buffer_size)) {
|
||||
unsigned int bytes;
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if (rec->firstzerotime == 0) {
|
||||
rec->firstzerotime = jiffies;
|
||||
snd_printk(KERN_DEBUG "STAT: (capture) "
|
||||
"@firstzerotime: mul_elapsed: %d, "
|
||||
"min_period_count: %d\n",
|
||||
rec->mul_elapsed, rec->min_period_count);
|
||||
snd_printk(KERN_DEBUG "STAT: (capture) "
|
||||
"@firstzerotime: sw_io: %d, sw_data: %d, "
|
||||
"appl_ptr: %u\n",
|
||||
rec->sw_io, rec->sw_data,
|
||||
(unsigned int)appl_ptr);
|
||||
}
|
||||
if ((jiffies - rec->firstzerotime) < 3750) {
|
||||
rec->zero_times[(jiffies - rec->firstzerotime)]++;
|
||||
rec->zero_times_saved++;
|
||||
} else
|
||||
rec->zero_times_notsaved++;
|
||||
#endif
|
||||
bytes = null(substream, rec);
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
rec->zeros2hw += bytes;
|
||||
if (bytes < 64)
|
||||
rec->zero_sizes[bytes]++;
|
||||
else
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: (capture) %d zero Bytes copied to "
|
||||
"hardware at once - too big to save!\n",
|
||||
bytes);
|
||||
#endif
|
||||
snd_pcm_indirect2_increase_min_periods(substream, rec, 0, 0,
|
||||
bytes);
|
||||
/* report an overrun */
|
||||
rec->sw_io = SNDRV_PCM_POS_XRUN;
|
||||
return;
|
||||
}
|
||||
while (rec->hw_ready && (rec->sw_ready < (int)rec->sw_buffer_size)) {
|
||||
/* sw_to_end: max. number of bytes that we can write to the
|
||||
* intermediate buffer (until it's end)
|
||||
*/
|
||||
size_t sw_to_end = rec->sw_buffer_size - rec->sw_data;
|
||||
|
||||
/* bytes: max. number of bytes, which may be copied to the
|
||||
* intermediate buffer without overflow (in _one_ step)
|
||||
*/
|
||||
size_t bytes = rec->sw_buffer_size - rec->sw_ready;
|
||||
|
||||
/* limit number of bytes (for transfer) by available room in
|
||||
* the intermediate buffer
|
||||
*/
|
||||
if (sw_to_end < bytes)
|
||||
bytes = sw_to_end;
|
||||
if (!bytes)
|
||||
break;
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if (rec->firstbytetime == 0)
|
||||
rec->firstbytetime = jiffies;
|
||||
rec->lastbytetime = jiffies;
|
||||
#endif
|
||||
/* copy bytes from the intermediate buffer (position sw_data)
|
||||
* to the HW at most and return number of bytes actually copied
|
||||
* from HW
|
||||
* Furthermore, set hw_ready to 0, if the fifo is empty now.
|
||||
*/
|
||||
bytes = copy(substream, rec, bytes);
|
||||
rec->bytes2hw += bytes;
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if (bytes < 64)
|
||||
rec->byte_sizes[bytes]++;
|
||||
else
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: (capture) %d Bytes copied to "
|
||||
"hardware at once - too big to save!\n",
|
||||
bytes);
|
||||
#endif
|
||||
/* increase sw_data by the number of actually copied bytes from
|
||||
* HW
|
||||
*/
|
||||
rec->sw_data += bytes;
|
||||
if (rec->sw_data == rec->sw_buffer_size)
|
||||
rec->sw_data = 0;
|
||||
|
||||
snd_pcm_indirect2_increase_min_periods(substream, rec, 0, 1,
|
||||
bytes);
|
||||
|
||||
/* number of bytes in the intermediate buffer, which haven't
|
||||
* been fetched by ALSA yet.
|
||||
*/
|
||||
rec->sw_ready += bytes;
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* helper function for capture interrupt routine
|
||||
*/
|
||||
void
|
||||
snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec,
|
||||
snd_pcm_indirect2_copy_t copy,
|
||||
snd_pcm_indirect2_zero_t null)
|
||||
{
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
rec->irq_occured++;
|
||||
#endif
|
||||
/* hardware recorded some bytes, so there is something to read from the
|
||||
* record fifo:
|
||||
*/
|
||||
rec->hw_ready = 1;
|
||||
|
||||
/* don't call ack() now, instead call transfer() function directly
|
||||
* (normally called by ack() )
|
||||
*/
|
||||
snd_pcm_indirect2_capture_transfer(substream, rec, copy, null);
|
||||
|
||||
if (rec->min_periods >= rec->min_multiple) {
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
if ((rec->min_periods / rec->min_multiple) > 7)
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: more than 7 (%d) mul_adds - "
|
||||
"too big to save!\n",
|
||||
(rec->min_periods / rec->min_multiple));
|
||||
else
|
||||
rec->mul_adds[(rec->min_periods /
|
||||
rec->min_multiple)]++;
|
||||
rec->mul_elapsed_real += (rec->min_periods /
|
||||
rec->min_multiple);
|
||||
rec->mul_elapsed++;
|
||||
|
||||
if (!(rec->mul_elapsed % 4)) {
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
unsigned int appl_ptr =
|
||||
frames_to_bytes(runtime,
|
||||
(unsigned int)runtime->control->
|
||||
appl_ptr) % rec->sw_buffer_size;
|
||||
int diff = rec->sw_data - appl_ptr;
|
||||
if (diff < 0)
|
||||
diff += rec->sw_buffer_size;
|
||||
snd_printk(KERN_DEBUG
|
||||
"STAT: mul_elapsed: %d, sw_data: %u, "
|
||||
"appl_ptr (bytes): %u, diff: %d\n",
|
||||
rec->mul_elapsed, rec->sw_data, appl_ptr,
|
||||
diff);
|
||||
}
|
||||
#endif
|
||||
rec->min_periods = 0;
|
||||
snd_pcm_period_elapsed(substream);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,140 @@
|
|||
/*
|
||||
* Helper functions for indirect PCM data transfer to a simple FIFO in
|
||||
* hardware (small, no possibility to read "hardware io position",
|
||||
* updating position done by interrupt, ...)
|
||||
*
|
||||
* Copyright (c) by 2007 Joachim Foerster <JOFT@gmx.de>
|
||||
*
|
||||
* Based on "pcm-indirect.h" (alsa-driver-1.0.13) by
|
||||
*
|
||||
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
|
||||
* Jaroslav Kysela <perex@suse.cz>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#ifndef __SOUND_PCM_INDIRECT2_H
|
||||
#define __SOUND_PCM_INDIRECT2_H
|
||||
|
||||
/* struct snd_pcm_substream, struct snd_pcm_runtime, snd_pcm_uframes_t */
|
||||
#include <sound/pcm.h>
|
||||
|
||||
/* Debug options for code which may be removed completely in a final version */
|
||||
#ifdef CONFIG_SND_DEBUG
|
||||
#define SND_PCM_INDIRECT2_STAT /* turn on some "statistics" about the
|
||||
* process of copying bytes from the
|
||||
* intermediate buffer to the hardware
|
||||
* fifo and the other way round
|
||||
*/
|
||||
#endif
|
||||
|
||||
struct snd_pcm_indirect2 {
|
||||
unsigned int hw_buffer_size; /* Byte size of hardware buffer */
|
||||
int hw_ready; /* playback: 1 = hw fifo has room left,
|
||||
* 0 = hw fifo is full
|
||||
*/
|
||||
unsigned int min_multiple;
|
||||
int min_periods; /* counts number of min. periods until
|
||||
* min_multiple is reached
|
||||
*/
|
||||
int min_period_count; /* counts bytes to count number of
|
||||
* min. periods
|
||||
*/
|
||||
|
||||
unsigned int sw_buffer_size; /* Byte size of software buffer */
|
||||
|
||||
/* sw_data: position in intermediate buffer, where we will read (or
|
||||
* write) from/to next time (to transfer data to/from HW)
|
||||
*/
|
||||
unsigned int sw_data; /* Offset to next dst (or src) in sw
|
||||
* ring buffer
|
||||
*/
|
||||
/* easiest case (playback):
|
||||
* sw_data is nearly the same as ~ runtime->control->appl_ptr, with the
|
||||
* exception that sw_data is "behind" by the number if bytes ALSA wrote
|
||||
* to the intermediate buffer last time.
|
||||
* A call to ack() callback synchronizes both indirectly.
|
||||
*/
|
||||
|
||||
/* We have no real sw_io pointer here. Usually sw_io is pointing to the
|
||||
* current playback/capture position _inside_ the hardware. Devices
|
||||
* with plain FIFOs often have no possibility to publish this position.
|
||||
* So we say: if sw_data is updated, that means bytes were copied to
|
||||
* the hardware, we increase sw_io by that amount, because there have
|
||||
* to be as much bytes which were played. So sw_io will stay behind
|
||||
* sw_data all the time and has to converge to sw_data at the end of
|
||||
* playback.
|
||||
*/
|
||||
unsigned int sw_io; /* Current software pointer in bytes */
|
||||
|
||||
/* sw_ready: number of bytes ALSA copied to the intermediate buffer, so
|
||||
* it represents the number of bytes which wait for transfer to the HW
|
||||
*/
|
||||
int sw_ready; /* Bytes ready to be transferred to/from hw */
|
||||
|
||||
/* appl_ptr: last known position of ALSA (where ALSA is going to write
|
||||
* next time into the intermediate buffer
|
||||
*/
|
||||
snd_pcm_uframes_t appl_ptr; /* Last seen appl_ptr */
|
||||
|
||||
unsigned int bytes2hw;
|
||||
int check_alignment;
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
unsigned int zeros2hw;
|
||||
unsigned int mul_elapsed;
|
||||
unsigned int mul_elapsed_real;
|
||||
unsigned long firstbytetime;
|
||||
unsigned long lastbytetime;
|
||||
unsigned long firstzerotime;
|
||||
unsigned int byte_sizes[64];
|
||||
unsigned int zero_sizes[64];
|
||||
unsigned int min_adds[8];
|
||||
unsigned int mul_adds[8];
|
||||
unsigned int zero_times[3750]; /* = 15s */
|
||||
unsigned int zero_times_saved;
|
||||
unsigned int zero_times_notsaved;
|
||||
unsigned int irq_occured;
|
||||
unsigned int pointer_calls;
|
||||
unsigned int lastdifftime;
|
||||
#endif
|
||||
};
|
||||
|
||||
typedef size_t (*snd_pcm_indirect2_copy_t) (struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec,
|
||||
size_t bytes);
|
||||
typedef size_t (*snd_pcm_indirect2_zero_t) (struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec);
|
||||
|
||||
#ifdef SND_PCM_INDIRECT2_STAT
|
||||
void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec);
|
||||
#endif
|
||||
|
||||
snd_pcm_uframes_t
|
||||
snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec);
|
||||
void
|
||||
snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec,
|
||||
snd_pcm_indirect2_copy_t copy,
|
||||
snd_pcm_indirect2_zero_t zero);
|
||||
void
|
||||
snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_indirect2 *rec,
|
||||
snd_pcm_indirect2_copy_t copy,
|
||||
snd_pcm_indirect2_zero_t null);
|
||||
|
||||
#endif /* __SOUND_PCM_INDIRECT2_H */
|
||||
Загрузка…
Ссылка в новой задаче