Quelle controller.c
Sprache: C
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Implementation of primary alsa driver code base for Intel HD Audio .
*
* Copyright ( c ) 2004 Intel Corporation
*
* Copyright ( c ) 2004 Takashi Iwai < tiwai @ suse . de >
* PeiSen Hou < pshou @ realtek . com . tw >
*/
#include <linux/clocksource.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#ifdef CONFIG_X86
/* for art-tsc conversion */
#include <asm /tsc.h>
#endif
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm_params.h>
#include "hda_controller.h"
#include "hda_local.h"
#define CREATE_TRACE_POINTS
#include "controller_trace.h"
/* DSP lock helpers */
#define dsp_lock(dev) snd_hdac_dsp_lock(azx_stream(dev))
#define dsp_unlock(dev) snd_hdac_dsp_unlock(azx_stream(dev))
#define dsp_is_locked(dev) snd_hdac_stream_is_locked(azx_stream(dev))
/* assign a stream for the PCM */
static inline struct azx_dev *
azx_assign_device(struct azx *chip, struct snd_pcm_substream *substream)
{
struct hdac_stream *s;
s = snd_hdac_stream_assign(azx_bus(chip), substream);
if (!s)
return NULL;
return stream_to_azx_dev(s);
}
/* release the assigned stream */
static inline void azx_release_device(struct azx_dev *azx_dev)
{
snd_hdac_stream_release(azx_stream(azx_dev));
}
static inline struct hda_pcm_stream *
to_hda_pcm_stream(struct snd_pcm_substream *substream)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
return &apcm->info->stream[substream->stream];
}
static u64 azx_adjust_codec_delay(struct snd_pcm_substream *substream,
u64 nsec)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
u64 codec_frames, codec_nsecs;
if (!hinfo->ops.get_delay)
return nsec;
codec_frames = hinfo->ops.get_delay(hinfo, apcm->codec, substream);
codec_nsecs = div_u64(codec_frames * 1000000000 LL,
substream->runtime->rate);
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
return nsec + codec_nsecs;
return (nsec > codec_nsecs) ? nsec - codec_nsecs : 0 ;
}
/*
* PCM ops
*/
static int azx_pcm_close(struct snd_pcm_substream *substream)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
struct azx *chip = apcm->chip;
struct azx_dev *azx_dev = get_azx_dev(substream);
trace_azx_pcm_close(chip, azx_dev);
mutex_lock(&chip->open_mutex);
azx_release_device(azx_dev);
if (hinfo->ops.close)
hinfo->ops.close(hinfo, apcm->codec, substream);
snd_hda_power_down(apcm->codec);
mutex_unlock(&chip->open_mutex);
snd_hda_codec_pcm_put(apcm->info);
return 0 ;
}
static int azx_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct azx *chip = apcm->chip;
struct azx_dev *azx_dev = get_azx_dev(substream);
struct hdac_stream *hdas = azx_stream(azx_dev);
int ret = 0 ;
trace_azx_pcm_hw_params(chip, azx_dev);
dsp_lock(azx_dev);
if (dsp_is_locked(azx_dev)) {
ret = -EBUSY;
goto unlock;
}
/* Set up BDLEs here, return -ENOMEM if too many BDLEs are required */
hdas->bufsize = params_buffer_bytes(hw_params);
hdas->period_bytes = params_period_bytes(hw_params);
hdas->format_val = 0 ;
hdas->no_period_wakeup =
(hw_params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
(hw_params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
if (snd_hdac_stream_setup_periods(hdas) < 0 )
ret = -ENOMEM;
unlock:
dsp_unlock(azx_dev);
return ret;
}
static int azx_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct azx_dev *azx_dev = get_azx_dev(substream);
struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
/* reset BDL address */
dsp_lock(azx_dev);
if (!dsp_is_locked(azx_dev))
snd_hdac_stream_cleanup(azx_stream(azx_dev));
snd_hda_codec_cleanup(apcm->codec, hinfo, substream);
azx_stream(azx_dev)->prepared = 0 ;
dsp_unlock(azx_dev);
return 0 ;
}
static int azx_pcm_prepare(struct snd_pcm_substream *substream)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct azx *chip = apcm->chip;
struct azx_dev *azx_dev = get_azx_dev(substream);
struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int format_val, stream_tag, bits;
int err;
struct hda_spdif_out *spdif =
snd_hda_spdif_out_of_nid(apcm->codec, hinfo->nid);
unsigned short ctls = spdif ? spdif->ctls : 0 ;
trace_azx_pcm_prepare(chip, azx_dev);
dsp_lock(azx_dev);
if (dsp_is_locked(azx_dev)) {
err = -EBUSY;
goto unlock;
}
snd_hdac_stream_reset(azx_stream(azx_dev));
bits = snd_hdac_stream_format_bits(runtime->format, SNDRV_PCM_SUBFORMAT_STD, hinfo->maxbps);
format_val = snd_hdac_spdif_stream_format(runtime->channels, bits, runtime->rate, ctls);
if (!format_val) {
dev_err(chip->card->dev,
"invalid format_val, rate=%d, ch=%d, format=%d\n" ,
runtime->rate, runtime->channels, runtime->format);
err = -EINVAL;
goto unlock;
}
err = snd_hdac_stream_set_params(azx_stream(azx_dev), format_val);
if (err < 0 )
goto unlock;
snd_hdac_stream_setup(azx_stream(azx_dev), false );
stream_tag = azx_dev->core.stream_tag;
/* CA-IBG chips need the playback stream starting from 1 */
if ((chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND) &&
stream_tag > chip->capture_streams)
stream_tag -= chip->capture_streams;
err = snd_hda_codec_prepare(apcm->codec, hinfo, stream_tag,
azx_dev->core.format_val, substream);
unlock:
if (!err)
azx_stream(azx_dev)->prepared = 1 ;
dsp_unlock(azx_dev);
return err;
}
static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct azx *chip = apcm->chip;
struct hdac_bus *bus = azx_bus(chip);
struct azx_dev *azx_dev;
struct snd_pcm_substream *s;
struct hdac_stream *hstr;
bool start;
int sbits = 0 ;
int sync_reg;
azx_dev = get_azx_dev(substream);
trace_azx_pcm_trigger(chip, azx_dev, cmd);
hstr = azx_stream(azx_dev);
if (chip->driver_caps & AZX_DCAPS_OLD_SSYNC)
sync_reg = AZX_REG_OLD_SSYNC;
else
sync_reg = AZX_REG_SSYNC;
if (dsp_is_locked(azx_dev) || !hstr->prepared)
return -EPIPE;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_RESUME:
start = true ;
break ;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
start = false ;
break ;
default :
return -EINVAL;
}
snd_pcm_group_for_each_entry(s, substream) {
if (s->pcm->card != substream->pcm->card)
continue ;
azx_dev = get_azx_dev(s);
sbits |= 1 << azx_dev->core.index;
snd_pcm_trigger_done(s, substream);
}
spin_lock(&bus->reg_lock);
/* first, set SYNC bits of corresponding streams */
snd_hdac_stream_sync_trigger(hstr, true , sbits, sync_reg);
snd_pcm_group_for_each_entry(s, substream) {
if (s->pcm->card != substream->pcm->card)
continue ;
azx_dev = get_azx_dev(s);
if (start) {
azx_dev->insufficient = 1 ;
snd_hdac_stream_start(azx_stream(azx_dev));
} else {
snd_hdac_stream_stop(azx_stream(azx_dev));
}
}
spin_unlock(&bus->reg_lock);
snd_hdac_stream_sync(hstr, start, sbits);
spin_lock(&bus->reg_lock);
/* reset SYNC bits */
snd_hdac_stream_sync_trigger(hstr, false , sbits, sync_reg);
snd_hdac_stream_timecounter_init(hstr, sbits, start);
spin_unlock(&bus->reg_lock);
return 0 ;
}
unsigned int azx_get_pos_lpib(struct azx *chip, struct azx_dev *azx_dev)
{
return snd_hdac_stream_get_pos_lpib(azx_stream(azx_dev));
}
EXPORT_SYMBOL_GPL(azx_get_pos_lpib);
unsigned int azx_get_pos_posbuf(struct azx *chip, struct azx_dev *azx_dev)
{
return snd_hdac_stream_get_pos_posbuf(azx_stream(azx_dev));
}
EXPORT_SYMBOL_GPL(azx_get_pos_posbuf);
unsigned int azx_get_position(struct azx *chip,
struct azx_dev *azx_dev)
{
struct snd_pcm_substream *substream = azx_dev->core.substream;
unsigned int pos;
int stream = substream->stream;
int delay = 0 ;
if (chip->get_position[stream])
pos = chip->get_position[stream](chip, azx_dev);
else /* use the position buffer as default */
pos = azx_get_pos_posbuf(chip, azx_dev);
if (pos >= azx_dev->core.bufsize)
pos = 0 ;
if (substream->runtime) {
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
if (chip->get_delay[stream])
delay += chip->get_delay[stream](chip, azx_dev, pos);
if (hinfo->ops.get_delay)
delay += hinfo->ops.get_delay(hinfo, apcm->codec,
substream);
substream->runtime->delay = delay;
}
trace_azx_get_position(chip, azx_dev, pos, delay);
return pos;
}
EXPORT_SYMBOL_GPL(azx_get_position);
static snd_pcm_uframes_t azx_pcm_pointer(struct snd_pcm_substream *substream)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct azx *chip = apcm->chip;
struct azx_dev *azx_dev = get_azx_dev(substream);
return bytes_to_frames(substream->runtime,
azx_get_position(chip, azx_dev));
}
/*
* azx_scale64 : Scale base by mult / div while not overflowing sanely
*
* Derived from scale64_check_overflow in kernel / time / timekeeping . c
*
* The tmestamps for a 48 Khz stream can overflow after ( 2 ^ 64 / 10 ^ 9 ) / 48 K which
* is about 384307 ie ~ 4 . 5 days .
*
* This scales the calculation so that overflow will happen but after 2 ^ 64 /
* 48000 secs , which is pretty large !
*
* In caln below :
* base may overflow , but since there isn ’ t any additional division
* performed on base it ’ s OK
* rem can ’ t overflow because both are 32 - bit values
*/
#ifdef CONFIG_X86
static u64 azx_scale64(u64 base, u32 num, u32 den)
{
u64 rem;
rem = do_div(base, den);
base *= num;
rem *= num;
do_div(rem, den);
return base + rem;
}
static int azx_get_sync_time(ktime_t *device,
struct system_counterval_t *system, void *ctx)
{
struct snd_pcm_substream *substream = ctx;
struct azx_dev *azx_dev = get_azx_dev(substream);
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct azx *chip = apcm->chip;
struct snd_pcm_runtime *runtime;
u64 ll_counter, ll_counter_l, ll_counter_h;
u64 tsc_counter, tsc_counter_l, tsc_counter_h;
u32 wallclk_ctr, wallclk_cycles;
bool direction;
u32 dma_select;
u32 timeout;
u32 retry_count = 0 ;
runtime = substream->runtime;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
direction = 1 ;
else
direction = 0 ;
/* 0th stream tag is not used, so DMA ch 0 is for 1st stream tag */
do {
timeout = 100 ;
dma_select = (direction << GTSCC_CDMAS_DMA_DIR_SHIFT) |
(azx_dev->core.stream_tag - 1 );
snd_hdac_chip_writel(azx_bus(chip), GTSCC, dma_select);
/* Enable the capture */
snd_hdac_chip_updatel(azx_bus(chip), GTSCC, 0 , GTSCC_TSCCI_MASK);
while (timeout) {
if (snd_hdac_chip_readl(azx_bus(chip), GTSCC) &
GTSCC_TSCCD_MASK)
break ;
timeout--;
}
if (!timeout) {
dev_err(chip->card->dev, "GTSCC capture Timedout!\n" );
return -EIO;
}
/* Read wall clock counter */
wallclk_ctr = snd_hdac_chip_readl(azx_bus(chip), WALFCC);
/* Read TSC counter */
tsc_counter_l = snd_hdac_chip_readl(azx_bus(chip), TSCCL);
tsc_counter_h = snd_hdac_chip_readl(azx_bus(chip), TSCCU);
/* Read Link counter */
ll_counter_l = snd_hdac_chip_readl(azx_bus(chip), LLPCL);
ll_counter_h = snd_hdac_chip_readl(azx_bus(chip), LLPCU);
/* Ack: registers read done */
snd_hdac_chip_writel(azx_bus(chip), GTSCC, GTSCC_TSCCD_SHIFT);
tsc_counter = (tsc_counter_h << TSCCU_CCU_SHIFT) |
tsc_counter_l;
ll_counter = (ll_counter_h << LLPC_CCU_SHIFT) | ll_counter_l;
wallclk_cycles = wallclk_ctr & WALFCC_CIF_MASK;
/*
* An error occurs near frame " rollover " . The clocks in
* frame value indicates whether this error may have
* occurred . Here we use the value of 10 i . e . ,
* HDA_MAX_CYCLE_OFFSET
*/
if (wallclk_cycles < HDA_MAX_CYCLE_VALUE - HDA_MAX_CYCLE_OFFSET
&& wallclk_cycles > HDA_MAX_CYCLE_OFFSET)
break ;
/*
* Sleep before we read again , else we may again get
* value near to MAX_CYCLE . Try to sleep for different
* amount of time so we dont hit the same number again
*/
udelay(retry_count++);
} while (retry_count != HDA_MAX_CYCLE_READ_RETRY);
if (retry_count == HDA_MAX_CYCLE_READ_RETRY) {
dev_err_ratelimited(chip->card->dev,
"Error in WALFCC cycle count\n" );
return -EIO;
}
*device = ns_to_ktime(azx_scale64(ll_counter,
NSEC_PER_SEC, runtime->rate));
*device = ktime_add_ns(*device, (wallclk_cycles * NSEC_PER_SEC) /
((HDA_MAX_CYCLE_VALUE + 1 ) * runtime->rate));
system->cycles = tsc_counter;
system->cs_id = CSID_X86_ART;
return 0 ;
}
#else
static int azx_get_sync_time(ktime_t *device,
struct system_counterval_t *system, void *ctx)
{
return -ENXIO;
}
#endif
static int azx_get_crosststamp(struct snd_pcm_substream *substream,
struct system_device_crosststamp *xtstamp)
{
return get_device_system_crosststamp(azx_get_sync_time,
substream, NULL, xtstamp);
}
static inline bool is_link_time_supported(struct snd_pcm_runtime *runtime,
struct snd_pcm_audio_tstamp_config *ts)
{
if (runtime->hw.info & SNDRV_PCM_INFO_HAS_LINK_SYNCHRONIZED_ATIME)
if (ts->type_requested == SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED)
return true ;
return false ;
}
static int azx_get_time_info(struct snd_pcm_substream *substream,
struct timespec64 *system_ts, struct timespec64 *audio_ts,
struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
struct snd_pcm_audio_tstamp_report *audio_tstamp_report)
{
struct azx_dev *azx_dev = get_azx_dev(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct system_device_crosststamp xtstamp;
int ret;
u64 nsec;
if ((substream->runtime->hw.info & SNDRV_PCM_INFO_HAS_LINK_ATIME) &&
(audio_tstamp_config->type_requested == SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK)) {
snd_pcm_gettime(substream->runtime, system_ts);
nsec = timecounter_read(&azx_dev->core.tc);
if (audio_tstamp_config->report_delay)
nsec = azx_adjust_codec_delay(substream, nsec);
*audio_ts = ns_to_timespec64(nsec);
audio_tstamp_report->actual_type = SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
audio_tstamp_report->accuracy_report = 1 ; /* rest of structure is valid */
audio_tstamp_report->accuracy = 42 ; /* 24 MHz WallClock == 42ns resolution */
} else if (is_link_time_supported(runtime, audio_tstamp_config)) {
ret = azx_get_crosststamp(substream, &xtstamp);
if (ret)
return ret;
switch (runtime->tstamp_type) {
case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
return -EINVAL;
case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
*system_ts = ktime_to_timespec64(xtstamp.sys_monoraw);
break ;
default :
*system_ts = ktime_to_timespec64(xtstamp.sys_realtime);
break ;
}
*audio_ts = ktime_to_timespec64(xtstamp.device);
audio_tstamp_report->actual_type =
SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED;
audio_tstamp_report->accuracy_report = 1 ;
/* 24 MHz WallClock == 42ns resolution */
audio_tstamp_report->accuracy = 42 ;
} else {
audio_tstamp_report->actual_type = SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
}
return 0 ;
}
static const struct snd_pcm_hardware azx_pcm_hw = {
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID |
/* No full-resume yet implemented */
/* SNDRV_PCM_INFO_RESUME |*/
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_SYNC_START |
SNDRV_PCM_INFO_HAS_WALL_CLOCK | /* legacy */
SNDRV_PCM_INFO_HAS_LINK_ATIME |
SNDRV_PCM_INFO_NO_PERIOD_WAKEUP),
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_48000,
.rate_min = 48000 ,
.rate_max = 48000 ,
.channels_min = 2 ,
.channels_max = 2 ,
.buffer_bytes_max = AZX_MAX_BUF_SIZE,
.period_bytes_min = 128 ,
.period_bytes_max = AZX_MAX_BUF_SIZE / 2 ,
.periods_min = 2 ,
.periods_max = AZX_MAX_FRAG,
.fifo_size = 0 ,
};
static int azx_pcm_open(struct snd_pcm_substream *substream)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
struct azx *chip = apcm->chip;
struct azx_dev *azx_dev;
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
int buff_step;
snd_hda_codec_pcm_get(apcm->info);
mutex_lock(&chip->open_mutex);
azx_dev = azx_assign_device(chip, substream);
trace_azx_pcm_open(chip, azx_dev);
if (azx_dev == NULL) {
err = -EBUSY;
goto unlock;
}
runtime->private_data = azx_dev;
runtime->hw = azx_pcm_hw;
if (chip->gts_present)
runtime->hw.info |= SNDRV_PCM_INFO_HAS_LINK_SYNCHRONIZED_ATIME;
runtime->hw.channels_min = hinfo->channels_min;
runtime->hw.channels_max = hinfo->channels_max;
runtime->hw.formats = hinfo->formats;
runtime->hw.rates = hinfo->rates;
snd_pcm_limit_hw_rates(runtime);
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
/* avoid wrap-around with wall-clock */
snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
20 ,
178000000 );
if (chip->align_buffer_size)
/* constrain buffer sizes to be multiple of 128
bytes . This is more efficient in terms of memory
access but isn ' t required by the HDA spec and
prevents users from specifying exact period / buffer
sizes . For example for 44 . 1 kHz , a period size set
to 20ms will be rounded to 19.59ms. */
buff_step = 128 ;
else
/* Don't enforce steps on buffer sizes, still need to
be multiple of 4 bytes ( HDA spec ) . Tested on Intel
HDA controllers , may not work on all devices where
option needs to be disabled */
buff_step = 4 ;
snd_pcm_hw_constraint_step(runtime, 0 , SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
buff_step);
snd_pcm_hw_constraint_step(runtime, 0 , SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
buff_step);
snd_hda_power_up(apcm->codec);
if (hinfo->ops.open)
err = hinfo->ops.open(hinfo, apcm->codec, substream);
else
err = -ENODEV;
if (err < 0 ) {
azx_release_device(azx_dev);
goto powerdown;
}
snd_pcm_limit_hw_rates(runtime);
/* sanity check */
if (snd_BUG_ON(!runtime->hw.channels_min) ||
snd_BUG_ON(!runtime->hw.channels_max) ||
snd_BUG_ON(!runtime->hw.formats) ||
snd_BUG_ON(!runtime->hw.rates)) {
azx_release_device(azx_dev);
if (hinfo->ops.close)
hinfo->ops.close(hinfo, apcm->codec, substream);
err = -EINVAL;
goto powerdown;
}
/* disable LINK_ATIME timestamps for capture streams
until we figure out how to handle digital inputs */
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
runtime->hw.info &= ~SNDRV_PCM_INFO_HAS_WALL_CLOCK; /* legacy */
runtime->hw.info &= ~SNDRV_PCM_INFO_HAS_LINK_ATIME;
}
snd_pcm_set_sync(substream);
mutex_unlock(&chip->open_mutex);
return 0 ;
powerdown:
snd_hda_power_down(apcm->codec);
unlock:
mutex_unlock(&chip->open_mutex);
snd_hda_codec_pcm_put(apcm->info);
return err;
}
static const struct snd_pcm_ops azx_pcm_ops = {
.open = azx_pcm_open,
.close = azx_pcm_close,
.hw_params = azx_pcm_hw_params,
.hw_free = azx_pcm_hw_free,
.prepare = azx_pcm_prepare,
.trigger = azx_pcm_trigger,
.pointer = azx_pcm_pointer,
.get_time_info = azx_get_time_info,
};
static void azx_pcm_free(struct snd_pcm *pcm)
{
struct azx_pcm *apcm = pcm->private_data;
if (apcm) {
list_del(&apcm->list);
apcm->info->pcm = NULL;
kfree(apcm);
}
}
#define MAX_PREALLOC_SIZE (32 * 1024 * 1024 )
int snd_hda_attach_pcm_stream(struct hda_bus *_bus, struct hda_codec *codec,
struct hda_pcm *cpcm)
{
struct hdac_bus *bus = &_bus->core;
struct azx *chip = bus_to_azx(bus);
struct snd_pcm *pcm;
struct azx_pcm *apcm;
int pcm_dev = cpcm->device;
unsigned int size;
int s, err;
int type = SNDRV_DMA_TYPE_DEV_SG;
list_for_each_entry(apcm, &chip->pcm_list, list) {
if (apcm->pcm->device == pcm_dev) {
dev_err(chip->card->dev, "PCM %d already exists\n" ,
pcm_dev);
return -EBUSY;
}
}
err = snd_pcm_new(chip->card, cpcm->name, pcm_dev,
cpcm->stream[SNDRV_PCM_STREAM_PLAYBACK].substreams,
cpcm->stream[SNDRV_PCM_STREAM_CAPTURE].substreams,
&pcm);
if (err < 0 )
return err;
strscpy(pcm->name, cpcm->name, sizeof (pcm->name));
apcm = kzalloc(sizeof (*apcm), GFP_KERNEL);
if (apcm == NULL) {
snd_device_free(chip->card, pcm);
return -ENOMEM;
}
apcm->chip = chip;
apcm->pcm = pcm;
apcm->codec = codec;
apcm->info = cpcm;
pcm->private_data = apcm;
pcm->private_free = azx_pcm_free;
if (cpcm->pcm_type == HDA_PCM_TYPE_MODEM)
pcm->dev_class = SNDRV_PCM_CLASS_MODEM;
list_add_tail(&apcm->list, &chip->pcm_list);
cpcm->pcm = pcm;
for (s = 0 ; s < 2 ; s++) {
if (cpcm->stream[s].substreams)
snd_pcm_set_ops(pcm, s, &azx_pcm_ops);
}
/* buffer pre-allocation */
size = CONFIG_SND_HDA_PREALLOC_SIZE * 1024 ;
if (size > MAX_PREALLOC_SIZE)
size = MAX_PREALLOC_SIZE;
if (chip->uc_buffer)
type = SNDRV_DMA_TYPE_DEV_WC_SG;
snd_pcm_set_managed_buffer_all(pcm, type, chip->card->dev,
size, MAX_PREALLOC_SIZE);
return 0 ;
}
static unsigned int azx_command_addr(u32 cmd)
{
unsigned int addr = cmd >> 28 ;
if (addr >= AZX_MAX_CODECS) {
snd_BUG();
addr = 0 ;
}
return addr;
}
/* receive a response */
static int azx_rirb_get_response(struct hdac_bus *bus, unsigned int addr,
unsigned int *res)
{
struct azx *chip = bus_to_azx(bus);
struct hda_bus *hbus = &chip->bus;
int err;
again:
err = snd_hdac_bus_get_response(bus, addr, res);
if (!err)
return 0 ;
if (hbus->no_response_fallback)
return -EIO;
if (!bus->polling_mode) {
dev_warn(chip->card->dev,
"azx_get_response timeout, switching to polling mode: last cmd=0x%08x\n" ,
bus->last_cmd[addr]);
bus->polling_mode = 1 ;
goto again;
}
if (chip->msi) {
dev_warn(chip->card->dev,
"No response from codec, disabling MSI: last cmd=0x%08x\n" ,
bus->last_cmd[addr]);
if (chip->ops->disable_msi_reset_irq &&
chip->ops->disable_msi_reset_irq(chip) < 0 )
return -EIO;
goto again;
}
if (chip->probing) {
/* If this critical timeout happens during the codec probing
* phase , this is likely an access to a non - existing codec
* slot . Better to return an error and reset the system .
*/
return -EIO;
}
/* no fallback mechanism? */
if (!chip->fallback_to_single_cmd)
return -EIO;
/* a fatal communication error; need either to reset or to fallback
* to the single_cmd mode
*/
if (hbus->allow_bus_reset && !hbus->response_reset && !hbus->in_reset) {
hbus->response_reset = 1 ;
dev_err(chip->card->dev,
"No response from codec, resetting bus: last cmd=0x%08x\n" ,
bus->last_cmd[addr]);
return -EAGAIN; /* give a chance to retry */
}
dev_err(chip->card->dev,
"azx_get_response timeout, switching to single_cmd mode: last cmd=0x%08x\n" ,
bus->last_cmd[addr]);
chip->single_cmd = 1 ;
hbus->response_reset = 0 ;
snd_hdac_bus_stop_cmd_io(bus);
return -EIO;
}
/*
* Use the single immediate command instead of CORB / RIRB for simplicity
*
* Note : according to Intel , this is not preferred use . The command was
* intended for the BIOS only , and may get confused with unsolicited
* responses . So , we shouldn ' t use it for normal operation from the
* driver .
* I left the codes , however , for debugging / testing purposes .
*/
/* receive a response */
static int azx_single_wait_for_response(struct azx *chip, unsigned int addr)
{
int timeout = 50 ;
while (timeout--) {
/* check IRV busy bit */
if (azx_readw(chip, IRS) & AZX_IRS_VALID) {
/* reuse rirb.res as the response return value */
azx_bus(chip)->rirb.res[addr] = azx_readl(chip, IR);
return 0 ;
}
udelay(1 );
}
if (printk_ratelimit())
dev_dbg(chip->card->dev, "get_response timeout: IRS=0x%x\n" ,
azx_readw(chip, IRS));
azx_bus(chip)->rirb.res[addr] = -1 ;
return -EIO;
}
/* send a command */
static int azx_single_send_cmd(struct hdac_bus *bus, u32 val)
{
struct azx *chip = bus_to_azx(bus);
unsigned int addr = azx_command_addr(val);
int timeout = 50 ;
bus->last_cmd[azx_command_addr(val)] = val;
while (timeout--) {
/* check ICB busy bit */
if (!((azx_readw(chip, IRS) & AZX_IRS_BUSY))) {
/* Clear IRV valid bit */
azx_writew(chip, IRS, azx_readw(chip, IRS) |
AZX_IRS_VALID);
azx_writel(chip, IC, val);
azx_writew(chip, IRS, azx_readw(chip, IRS) |
AZX_IRS_BUSY);
return azx_single_wait_for_response(chip, addr);
}
udelay(1 );
}
if (printk_ratelimit())
dev_dbg(chip->card->dev,
"send_cmd timeout: IRS=0x%x, val=0x%x\n" ,
azx_readw(chip, IRS), val);
return -EIO;
}
/* receive a response */
static int azx_single_get_response(struct hdac_bus *bus, unsigned int addr,
unsigned int *res)
{
if (res)
*res = bus->rirb.res[addr];
return 0 ;
}
/*
* The below are the main callbacks from hda_codec .
*
* They are just the skeleton to call sub - callbacks according to the
* current setting of chip - > single_cmd .
*/
/* send a command */
static int azx_send_cmd(struct hdac_bus *bus, unsigned int val)
{
struct azx *chip = bus_to_azx(bus);
if (chip->disabled)
return 0 ;
if (chip->single_cmd || bus->use_pio_for_commands)
return azx_single_send_cmd(bus, val);
else
return snd_hdac_bus_send_cmd(bus, val);
}
/* get a response */
static int azx_get_response(struct hdac_bus *bus, unsigned int addr,
unsigned int *res)
{
struct azx *chip = bus_to_azx(bus);
if (chip->disabled)
return 0 ;
if (chip->single_cmd || bus->use_pio_for_commands)
return azx_single_get_response(bus, addr, res);
else
return azx_rirb_get_response(bus, addr, res);
}
static const struct hdac_bus_ops bus_core_ops = {
.command = azx_send_cmd,
.get_response = azx_get_response,
};
#ifdef CONFIG_SND_HDA_DSP_LOADER
/*
* DSP loading code ( e . g . for CA0132 )
*/
/* use the first stream for loading DSP */
static struct azx_dev *
azx_get_dsp_loader_dev(struct azx *chip)
{
struct hdac_bus *bus = azx_bus(chip);
struct hdac_stream *s;
list_for_each_entry(s, &bus->stream_list, list)
if (s->index == chip->playback_index_offset)
return stream_to_azx_dev(s);
return NULL;
}
int snd_hda_codec_load_dsp_prepare(struct hda_codec *codec, unsigned int format,
unsigned int byte_size,
struct snd_dma_buffer *bufp)
{
struct hdac_bus *bus = &codec->bus->core;
struct azx *chip = bus_to_azx(bus);
struct azx_dev *azx_dev;
struct hdac_stream *hstr;
bool saved = false ;
int err;
azx_dev = azx_get_dsp_loader_dev(chip);
hstr = azx_stream(azx_dev);
spin_lock_irq(&bus->reg_lock);
if (hstr->opened) {
chip->saved_azx_dev = *azx_dev;
saved = true ;
}
spin_unlock_irq(&bus->reg_lock);
err = snd_hdac_dsp_prepare(hstr, format, byte_size, bufp);
if (err < 0 ) {
spin_lock_irq(&bus->reg_lock);
if (saved)
*azx_dev = chip->saved_azx_dev;
spin_unlock_irq(&bus->reg_lock);
return err;
}
hstr->prepared = 0 ;
return err;
}
EXPORT_SYMBOL_GPL(snd_hda_codec_load_dsp_prepare);
void snd_hda_codec_load_dsp_trigger(struct hda_codec *codec, bool start)
{
struct hdac_bus *bus = &codec->bus->core;
struct azx *chip = bus_to_azx(bus);
struct azx_dev *azx_dev = azx_get_dsp_loader_dev(chip);
snd_hdac_dsp_trigger(azx_stream(azx_dev), start);
}
EXPORT_SYMBOL_GPL(snd_hda_codec_load_dsp_trigger);
void snd_hda_codec_load_dsp_cleanup(struct hda_codec *codec,
struct snd_dma_buffer *dmab)
{
struct hdac_bus *bus = &codec->bus->core;
struct azx *chip = bus_to_azx(bus);
struct azx_dev *azx_dev = azx_get_dsp_loader_dev(chip);
struct hdac_stream *hstr = azx_stream(azx_dev);
if (!dmab->area || !hstr->locked)
return ;
snd_hdac_dsp_cleanup(hstr, dmab);
spin_lock_irq(&bus->reg_lock);
if (hstr->opened)
*azx_dev = chip->saved_azx_dev;
hstr->locked = false ;
spin_unlock_irq(&bus->reg_lock);
}
EXPORT_SYMBOL_GPL(snd_hda_codec_load_dsp_cleanup);
#endif /* CONFIG_SND_HDA_DSP_LOADER */
/*
* reset and start the controller registers
*/
void azx_init_chip(struct azx *chip, bool full_reset)
{
if (snd_hdac_bus_init_chip(azx_bus(chip), full_reset)) {
/* correct RINTCNT for CXT */
if (chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND)
azx_writew(chip, RINTCNT, 0 xc0);
}
}
EXPORT_SYMBOL_GPL(azx_init_chip);
void azx_stop_all_streams(struct azx *chip)
{
struct hdac_bus *bus = azx_bus(chip);
snd_hdac_stop_streams(bus);
}
EXPORT_SYMBOL_GPL(azx_stop_all_streams);
void azx_stop_chip(struct azx *chip)
{
snd_hdac_bus_stop_chip(azx_bus(chip));
}
EXPORT_SYMBOL_GPL(azx_stop_chip);
/*
* interrupt handler
*/
static void stream_update(struct hdac_bus *bus, struct hdac_stream *s)
{
struct azx *chip = bus_to_azx(bus);
struct azx_dev *azx_dev = stream_to_azx_dev(s);
/* check whether this IRQ is really acceptable */
if (!chip->ops->position_check ||
chip->ops->position_check(chip, azx_dev)) {
spin_unlock(&bus->reg_lock);
snd_pcm_period_elapsed(azx_stream(azx_dev)->substream);
spin_lock(&bus->reg_lock);
}
}
irqreturn_t azx_interrupt(int irq, void *dev_id)
{
struct azx *chip = dev_id;
struct hdac_bus *bus = azx_bus(chip);
u32 status;
bool active, handled = false ;
int repeat = 0 ; /* count for avoiding endless loop */
if (azx_has_pm_runtime(chip))
if (!pm_runtime_active(chip->card->dev))
return IRQ_NONE;
spin_lock(&bus->reg_lock);
if (chip->disabled)
goto unlock;
do {
status = azx_readl(chip, INTSTS);
if (status == 0 || status == 0 xffffffff)
break ;
handled = true ;
active = false ;
if (snd_hdac_bus_handle_stream_irq(bus, status, stream_update))
active = true ;
status = azx_readb(chip, RIRBSTS);
if (status & RIRB_INT_MASK) {
/*
* Clearing the interrupt status here ensures that no
* interrupt gets masked after the RIRB wp is read in
* snd_hdac_bus_update_rirb . This avoids a possible
* race condition where codec response in RIRB may
* remain unserviced by IRQ , eventually falling back
* to polling mode in azx_rirb_get_response .
*/
azx_writeb(chip, RIRBSTS, RIRB_INT_MASK);
active = true ;
if (status & RIRB_INT_RESPONSE) {
if (chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND)
udelay(80 );
snd_hdac_bus_update_rirb(bus);
}
}
} while (active && ++repeat < 10 );
unlock:
spin_unlock(&bus->reg_lock);
return IRQ_RETVAL(handled);
}
EXPORT_SYMBOL_GPL(azx_interrupt);
/*
* Codec initerface
*/
/*
* Probe the given codec address
*/
static int probe_codec(struct azx *chip, int addr)
{
unsigned int cmd = (addr << 28 ) | (AC_NODE_ROOT << 20 ) |
(AC_VERB_PARAMETERS << 8 ) | AC_PAR_VENDOR_ID;
struct hdac_bus *bus = azx_bus(chip);
int err;
unsigned int res = -1 ;
mutex_lock(&bus->cmd_mutex);
chip->probing = 1 ;
azx_send_cmd(bus, cmd);
err = azx_get_response(bus, addr, &res);
chip->probing = 0 ;
mutex_unlock(&bus->cmd_mutex);
if (err < 0 || res == -1 )
return -EIO;
dev_dbg(chip->card->dev, "codec #%d probed OK\n" , addr);
return 0 ;
}
void snd_hda_bus_reset(struct hda_bus *bus)
{
struct azx *chip = bus_to_azx(&bus->core);
bus->in_reset = 1 ;
azx_stop_chip(chip);
azx_init_chip(chip, true );
if (bus->core.chip_init)
snd_hda_bus_reset_codecs(bus);
bus->in_reset = 0 ;
}
/* HD-audio bus initialization */
int azx_bus_init(struct azx *chip, const char *model)
{
struct hda_bus *bus = &chip->bus;
int err;
err = snd_hdac_bus_init(&bus->core, chip->card->dev, &bus_core_ops);
if (err < 0 )
return err;
bus->card = chip->card;
mutex_init(&bus->prepare_mutex);
bus->pci = chip->pci;
bus->modelname = model;
bus->mixer_assigned = -1 ;
bus->core.snoop = azx_snoop(chip);
if (chip->get_position[0 ] != azx_get_pos_lpib ||
chip->get_position[1 ] != azx_get_pos_lpib)
bus->core.use_posbuf = true ;
bus->core.bdl_pos_adj = chip->bdl_pos_adj;
if (chip->driver_caps & AZX_DCAPS_CORBRP_SELF_CLEAR)
bus->core.corbrp_self_clear = true ;
if (chip->driver_caps & AZX_DCAPS_4K_BDLE_BOUNDARY)
bus->core.align_bdle_4k = true ;
if (chip->driver_caps & AZX_DCAPS_PIO_COMMANDS)
bus->core.use_pio_for_commands = true ;
/* enable sync_write flag for stable communication as default */
bus->core.sync_write = 1 ;
return 0 ;
}
EXPORT_SYMBOL_GPL(azx_bus_init);
/* Probe codecs */
int azx_probe_codecs(struct azx *chip, unsigned int max_slots)
{
struct hdac_bus *bus = azx_bus(chip);
int c, codecs, err;
codecs = 0 ;
if (!max_slots)
max_slots = AZX_DEFAULT_CODECS;
/* First try to probe all given codec slots */
for (c = 0 ; c < max_slots; c++) {
if ((bus->codec_mask & (1 << c)) & chip->codec_probe_mask) {
if (probe_codec(chip, c) < 0 ) {
/* Some BIOSen give you wrong codec addresses
* that don ' t exist
*/
dev_warn(chip->card->dev,
"Codec #%d probe error; disabling it...\n" , c);
bus->codec_mask &= ~(1 << c);
/* no codecs */
if (bus->codec_mask == 0 )
break ;
/* More badly, accessing to a non-existing
* codec often screws up the controller chip ,
* and disturbs the further communications .
* Thus if an error occurs during probing ,
* better to reset the controller chip to
* get back to the sanity state .
*/
azx_stop_chip(chip);
azx_init_chip(chip, true );
}
}
}
/* Then create codec instances */
for (c = 0 ; c < max_slots; c++) {
if ((bus->codec_mask & (1 << c)) & chip->codec_probe_mask) {
struct hda_codec *codec;
err = snd_hda_codec_new(&chip->bus, chip->card, c, &codec);
if (err < 0 )
continue ;
codec->jackpoll_interval = chip->jackpoll_interval;
codec->beep_mode = chip->beep_mode;
codec->ctl_dev_id = chip->ctl_dev_id;
codecs++;
}
}
if (!codecs) {
dev_err(chip->card->dev, "no codecs initialized\n" );
return -ENXIO;
}
return 0 ;
}
EXPORT_SYMBOL_GPL(azx_probe_codecs);
/* configure each codec instance */
int azx_codec_configure(struct azx *chip)
{
struct hda_codec *codec, *next;
int success = 0 ;
list_for_each_codec(codec, &chip->bus) {
if (!snd_hda_codec_configure(codec))
success++;
}
if (success) {
/* unregister failed codecs if any codec has been probed */
list_for_each_codec_safe(codec, next, &chip->bus) {
if (!codec->configured) {
codec_err(codec, "Unable to configure, disabling\n" );
snd_hdac_device_unregister(&codec->core);
}
}
}
return success ? 0 : -ENODEV;
}
EXPORT_SYMBOL_GPL(azx_codec_configure);
static int stream_direction(struct azx *chip, unsigned char index)
{
if (index >= chip->capture_index_offset &&
index < chip->capture_index_offset + chip->capture_streams)
return SNDRV_PCM_STREAM_CAPTURE;
return SNDRV_PCM_STREAM_PLAYBACK;
}
/* initialize SD streams */
int azx_init_streams(struct azx *chip)
{
int i;
int stream_tags[2 ] = { 0 , 0 };
/* initialize each stream (aka device)
* assign the starting bdl address to each stream ( device )
* and initialize
*/
for (i = 0 ; i < chip->num_streams; i++) {
struct azx_dev *azx_dev = kzalloc(sizeof (*azx_dev), GFP_KERNEL);
int dir, tag;
if (!azx_dev)
return -ENOMEM;
dir = stream_direction(chip, i);
/* stream tag must be unique throughout
* the stream direction group ,
* valid values 1 . . . 15
* use separate stream tag if the flag
* AZX_DCAPS_SEPARATE_STREAM_TAG is used
*/
if (chip->driver_caps & AZX_DCAPS_SEPARATE_STREAM_TAG)
tag = ++stream_tags[dir];
else
tag = i + 1 ;
snd_hdac_stream_init(azx_bus(chip), azx_stream(azx_dev),
i, dir, tag);
}
return 0 ;
}
EXPORT_SYMBOL_GPL(azx_init_streams);
void azx_free_streams(struct azx *chip)
{
struct hdac_bus *bus = azx_bus(chip);
struct hdac_stream *s;
while (!list_empty(&bus->stream_list)) {
s = list_first_entry(&bus->stream_list, struct hdac_stream, list);
list_del(&s->list);
kfree(stream_to_azx_dev(s));
}
}
EXPORT_SYMBOL_GPL(azx_free_streams);
Messung V0.5 in Prozent C=95 H=92 G=93
¤ Dauer der Verarbeitung: 0.16 Sekunden
(vorverarbeitet am 2026-09-28)
¤
*© Formatika GbR, Deutschland
2026-10-11
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