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linux/sound/firewire/tascam/tascam-stream.c
Takashi Sakamoto 07b266424d ALSA: firewire-tascam: reserve/release isochronous resources in pcm.hw_params/hw_free callbacks 
Once allocated, isochronous resources are available for packet
streaming, even if the streaming is cancelled. For this reason,
current implementation handles allocation of the resources and
starting packet streaming at the same time. However, this brings
complicated procedure to start packet streaming.

This commit separates the allocation and starting. The allocation is
done in pcm.hw_params callback and available till pcm.hw_free callback.
Even if any XRUN occurs, pcm.prepare callback is done to restart
packet streaming for allocated the resources.

There are two points to stop packet streaming; in pcm.hw_params and
pcm.prepare callbacks.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2019-06-11 11:36:19 +02:00

500 lines
11 KiB
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/*
* tascam-stream.c - a part of driver for TASCAM FireWire series
*
* Copyright (c) 2015 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include <linux/delay.h>
#include "tascam.h"
#define CALLBACK_TIMEOUT 500
static int get_clock(struct snd_tscm *tscm, u32 *data)
{
__be32 reg;
int err;
err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS,
&reg, sizeof(reg), 0);
if (err >= 0)
*data = be32_to_cpu(reg);
return err;
}
static int set_clock(struct snd_tscm *tscm, unsigned int rate,
enum snd_tscm_clock clock)
{
u32 data;
__be32 reg;
int err;
err = get_clock(tscm, &data);
if (err < 0)
return err;
data &= 0x0000ffff;
if (rate > 0) {
data &= 0x000000ff;
/* Base rate. */
if ((rate % 44100) == 0) {
data |= 0x00000100;
/* Multiplier. */
if (rate / 44100 == 2)
data |= 0x00008000;
} else if ((rate % 48000) == 0) {
data |= 0x00000200;
/* Multiplier. */
if (rate / 48000 == 2)
data |= 0x00008000;
} else {
return -EAGAIN;
}
}
if (clock != INT_MAX) {
data &= 0x0000ff00;
data |= clock + 1;
}
reg = cpu_to_be32(data);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
if (data & 0x00008000)
reg = cpu_to_be32(0x0000001a);
else
reg = cpu_to_be32(0x0000000d);
return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_MULTIPLEX_MODE,
&reg, sizeof(reg), 0);
}
int snd_tscm_stream_get_rate(struct snd_tscm *tscm, unsigned int *rate)
{
u32 data = 0x0;
unsigned int trials = 0;
int err;
while (data == 0x0 || trials++ < 5) {
err = get_clock(tscm, &data);
if (err < 0)
return err;
data = (data & 0xff000000) >> 24;
}
/* Check base rate. */
if ((data & 0x0f) == 0x01)
*rate = 44100;
else if ((data & 0x0f) == 0x02)
*rate = 48000;
else
return -EAGAIN;
/* Check multiplier. */
if ((data & 0xf0) == 0x80)
*rate *= 2;
else if ((data & 0xf0) != 0x00)
return -EAGAIN;
return err;
}
int snd_tscm_stream_get_clock(struct snd_tscm *tscm, enum snd_tscm_clock *clock)
{
u32 data;
int err;
err = get_clock(tscm, &data);
if (err < 0)
return err;
*clock = ((data & 0x00ff0000) >> 16) - 1;
if (*clock < 0 || *clock > SND_TSCM_CLOCK_ADAT)
return -EIO;
return 0;
}
static int enable_data_channels(struct snd_tscm *tscm)
{
__be32 reg;
u32 data;
unsigned int i;
int err;
data = 0;
for (i = 0; i < tscm->spec->pcm_capture_analog_channels; ++i)
data |= BIT(i);
if (tscm->spec->has_adat)
data |= 0x0000ff00;
if (tscm->spec->has_spdif)
data |= 0x00030000;
reg = cpu_to_be32(data);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_TX_PCM_CHANNELS,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
data = 0;
for (i = 0; i < tscm->spec->pcm_playback_analog_channels; ++i)
data |= BIT(i);
if (tscm->spec->has_adat)
data |= 0x0000ff00;
if (tscm->spec->has_spdif)
data |= 0x00030000;
reg = cpu_to_be32(data);
return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_RX_PCM_CHANNELS,
&reg, sizeof(reg), 0);
}
static int set_stream_formats(struct snd_tscm *tscm, unsigned int rate)
{
__be32 reg;
int err;
// Set an option for unknown purpose.
reg = cpu_to_be32(0x00200000);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_SET_OPTION,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
return enable_data_channels(tscm);
}
static void finish_session(struct snd_tscm *tscm)
{
__be32 reg;
reg = 0;
snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_START_STREAMING,
&reg, sizeof(reg), 0);
reg = 0;
snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_ON,
&reg, sizeof(reg), 0);
// Unregister channels.
reg = cpu_to_be32(0x00000000);
snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_CH,
&reg, sizeof(reg), 0);
reg = cpu_to_be32(0x00000000);
snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_UNKNOWN,
&reg, sizeof(reg), 0);
reg = cpu_to_be32(0x00000000);
snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_CH,
&reg, sizeof(reg), 0);
}
static int begin_session(struct snd_tscm *tscm)
{
__be32 reg;
int err;
// Register the isochronous channel for transmitting stream.
reg = cpu_to_be32(tscm->tx_resources.channel);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_CH,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
// Unknown.
reg = cpu_to_be32(0x00000002);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_UNKNOWN,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
// Register the isochronous channel for receiving stream.
reg = cpu_to_be32(tscm->rx_resources.channel);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_CH,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
reg = cpu_to_be32(0x00000001);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_START_STREAMING,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
reg = cpu_to_be32(0x00000001);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_ON,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
// Set an option for unknown purpose.
reg = cpu_to_be32(0x00002000);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_SET_OPTION,
&reg, sizeof(reg), 0);
if (err < 0)
return err;
// Start multiplexing PCM samples on packets.
reg = cpu_to_be32(0x00000001);
return snd_fw_transaction(tscm->unit,
TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_ON,
&reg, sizeof(reg), 0);
}
static int keep_resources(struct snd_tscm *tscm, unsigned int rate,
struct amdtp_stream *stream)
{
struct fw_iso_resources *resources;
int err;
if (stream == &tscm->tx_stream)
resources = &tscm->tx_resources;
else
resources = &tscm->rx_resources;
err = amdtp_tscm_set_parameters(stream, rate);
if (err < 0)
return err;
return fw_iso_resources_allocate(resources,
amdtp_stream_get_max_payload(stream),
fw_parent_device(tscm->unit)->max_speed);
}
int snd_tscm_stream_init_duplex(struct snd_tscm *tscm)
{
unsigned int pcm_channels;
int err;
/* For out-stream. */
err = fw_iso_resources_init(&tscm->rx_resources, tscm->unit);
if (err < 0)
return err;
pcm_channels = tscm->spec->pcm_playback_analog_channels;
if (tscm->spec->has_adat)
pcm_channels += 8;
if (tscm->spec->has_spdif)
pcm_channels += 2;
err = amdtp_tscm_init(&tscm->rx_stream, tscm->unit, AMDTP_OUT_STREAM,
pcm_channels);
if (err < 0)
return err;
/* For in-stream. */
err = fw_iso_resources_init(&tscm->tx_resources, tscm->unit);
if (err < 0)
return err;
pcm_channels = tscm->spec->pcm_capture_analog_channels;
if (tscm->spec->has_adat)
pcm_channels += 8;
if (tscm->spec->has_spdif)
pcm_channels += 2;
err = amdtp_tscm_init(&tscm->tx_stream, tscm->unit, AMDTP_IN_STREAM,
pcm_channels);
if (err < 0)
amdtp_stream_destroy(&tscm->rx_stream);
return err;
}
/* At bus reset, streaming is stopped and some registers are clear. */
void snd_tscm_stream_update_duplex(struct snd_tscm *tscm)
{
amdtp_stream_pcm_abort(&tscm->tx_stream);
amdtp_stream_stop(&tscm->tx_stream);
amdtp_stream_pcm_abort(&tscm->rx_stream);
amdtp_stream_stop(&tscm->rx_stream);
}
/*
* This function should be called before starting streams or after stopping
* streams.
*/
void snd_tscm_stream_destroy_duplex(struct snd_tscm *tscm)
{
amdtp_stream_destroy(&tscm->rx_stream);
amdtp_stream_destroy(&tscm->tx_stream);
fw_iso_resources_destroy(&tscm->rx_resources);
fw_iso_resources_destroy(&tscm->tx_resources);
}
int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate)
{
unsigned int curr_rate;
int err;
err = snd_tscm_stream_get_rate(tscm, &curr_rate);
if (err < 0)
return err;
if (tscm->substreams_counter == 0 || rate != curr_rate) {
amdtp_stream_stop(&tscm->rx_stream);
amdtp_stream_stop(&tscm->tx_stream);
finish_session(tscm);
fw_iso_resources_free(&tscm->tx_resources);
fw_iso_resources_free(&tscm->rx_resources);
err = set_clock(tscm, rate, INT_MAX);
if (err < 0)
return err;
err = keep_resources(tscm, rate, &tscm->tx_stream);
if (err < 0)
return err;
err = keep_resources(tscm, rate, &tscm->rx_stream);
if (err < 0) {
fw_iso_resources_free(&tscm->tx_resources);
return err;
}
}
return 0;
}
void snd_tscm_stream_release_duplex(struct snd_tscm *tscm)
{
if (tscm->substreams_counter == 0) {
fw_iso_resources_free(&tscm->tx_resources);
fw_iso_resources_free(&tscm->rx_resources);
}
}
int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate)
{
int err;
if (tscm->substreams_counter == 0)
return 0;
if (amdtp_streaming_error(&tscm->rx_stream) ||
amdtp_streaming_error(&tscm->tx_stream)) {
amdtp_stream_stop(&tscm->rx_stream);
amdtp_stream_stop(&tscm->tx_stream);
finish_session(tscm);
}
if (!amdtp_stream_running(&tscm->rx_stream)) {
err = set_stream_formats(tscm, rate);
if (err < 0)
goto error;
err = begin_session(tscm);
if (err < 0)
goto error;
err = amdtp_stream_start(&tscm->rx_stream,
tscm->rx_resources.channel,
fw_parent_device(tscm->unit)->max_speed);
if (err < 0)
goto error;
if (!amdtp_stream_wait_callback(&tscm->rx_stream,
CALLBACK_TIMEOUT)) {
err = -ETIMEDOUT;
goto error;
}
}
if (!amdtp_stream_running(&tscm->tx_stream)) {
err = amdtp_stream_start(&tscm->tx_stream,
tscm->tx_resources.channel,
fw_parent_device(tscm->unit)->max_speed);
if (err < 0)
goto error;
if (!amdtp_stream_wait_callback(&tscm->tx_stream,
CALLBACK_TIMEOUT)) {
err = -ETIMEDOUT;
goto error;
}
}
return 0;
error:
amdtp_stream_stop(&tscm->rx_stream);
amdtp_stream_stop(&tscm->tx_stream);
finish_session(tscm);
return err;
}
void snd_tscm_stream_stop_duplex(struct snd_tscm *tscm)
{
if (tscm->substreams_counter == 0) {
amdtp_stream_stop(&tscm->tx_stream);
amdtp_stream_stop(&tscm->rx_stream);
finish_session(tscm);
}
}
void snd_tscm_stream_lock_changed(struct snd_tscm *tscm)
{
tscm->dev_lock_changed = true;
wake_up(&tscm->hwdep_wait);
}
int snd_tscm_stream_lock_try(struct snd_tscm *tscm)
{
int err;
spin_lock_irq(&tscm->lock);
/* user land lock this */
if (tscm->dev_lock_count < 0) {
err = -EBUSY;
goto end;
}
/* this is the first time */
if (tscm->dev_lock_count++ == 0)
snd_tscm_stream_lock_changed(tscm);
err = 0;
end:
spin_unlock_irq(&tscm->lock);
return err;
}
void snd_tscm_stream_lock_release(struct snd_tscm *tscm)
{
spin_lock_irq(&tscm->lock);
if (WARN_ON(tscm->dev_lock_count <= 0))
goto end;
if (--tscm->dev_lock_count == 0)
snd_tscm_stream_lock_changed(tscm);
end:
spin_unlock_irq(&tscm->lock);
}
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