// SPDX-License-Identifier: GPL-2.0-only
/*
* ff-stream.c - a part of driver for RME Fireface series
*
* Copyright (c) 2015-2017 Takashi Sakamoto
*/
#include "ff.h"
#define READY_TIMEOUT_MS 200
int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
enum snd_ff_stream_mode *mode)
{
static const enum snd_ff_stream_mode modes[] = {
[CIP_SFC_32000] = SND_FF_STREAM_MODE_LOW,
[CIP_SFC_44100] = SND_FF_STREAM_MODE_LOW,
[CIP_SFC_48000] = SND_FF_STREAM_MODE_LOW,
[CIP_SFC_88200] = SND_FF_STREAM_MODE_MID,
[CIP_SFC_96000] = SND_FF_STREAM_MODE_MID,
[CIP_SFC_176400] = SND_FF_STREAM_MODE_HIGH,
[CIP_SFC_192000] = SND_FF_STREAM_MODE_HIGH,
};
if (sfc >= CIP_SFC_COUNT)
return -EINVAL;
*mode = modes[sfc];
return 0;
}
static inline void finish_session(struct snd_ff *ff)
{
ff->spec->protocol->finish_session(ff);
ff->spec->protocol->switch_fetching_mode(ff, false);
}
static int init_stream(struct snd_ff *ff, struct amdtp_stream *s)
{
struct fw_iso_resources *resources;
enum amdtp_stream_direction dir;
int err;
if (s == &ff->tx_stream) {
resources = &ff->tx_resources;
dir = AMDTP_IN_STREAM;
} else {
resources = &ff->rx_resources;
dir = AMDTP_OUT_STREAM;
}
err = fw_iso_resources_init(resources, ff->unit);
if (err < 0)
return err;
err = amdtp_ff_init(s, ff->unit, dir);
if (err < 0)
fw_iso_resources_destroy(resources);
return err;
}
static void destroy_stream(struct snd_ff *ff, struct amdtp_stream *s)
{
amdtp_stream_destroy(s);
if (s == &ff->tx_stream)
fw_iso_resources_destroy(&ff->tx_resources);
else
fw_iso_resources_destroy(&ff->rx_resources);
}
int snd_ff_stream_init_duplex(struct snd_ff *ff)
{
int err;
err = init_stream(ff, &ff->rx_stream);
if (err < 0)
return err;
err = init_stream(ff, &ff->tx_stream);
if (err < 0) {
destroy_stream(ff, &ff->rx_stream);
return err;
}
err = amdtp_domain_init(&ff->domain);
if (err < 0) {
destroy_stream(ff, &ff->rx_stream);
destroy_stream(ff, &ff->tx_stream);
}
return err;
}
/*
* This function should be called before starting streams or after stopping
* streams.
*/
void snd_ff_stream_destroy_duplex(struct snd_ff *ff)
{
amdtp_domain_destroy(&ff->domain);
destroy_stream(ff, &ff->rx_stream);
destroy_stream(ff, &ff->tx_stream);
}
int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
unsigned int frames_per_period,
unsigned int frames_per_buffer)
{
unsigned int curr_rate;
enum snd_ff_clock_src src;
int err;
err = ff->spec->protocol->get_clock(ff, &curr_rate, &src);
if (err < 0)
return err;
if (ff->substreams_counter == 0 || curr_rate != rate) {
enum snd_ff_stream_mode mode;
int i;
amdtp_domain_stop(&ff->domain);
finish_session(ff);
fw_iso_resources_free(&ff->tx_resources);
fw_iso_resources_free(&ff->rx_resources);
for (i = 0; i < CIP_SFC_COUNT; ++i) {
if (amdtp_rate_table[i] == rate)
break;
}
if (i >= CIP_SFC_COUNT)
return -EINVAL;
err = snd_ff_stream_get_multiplier_mode(i, &mode);
if (err < 0)
return err;
err = amdtp_ff_set_parameters(&ff->tx_stream, rate,
ff->spec->pcm_capture_channels[mode]);
if (err < 0)
return err;
err = amdtp_ff_set_parameters(&ff->rx_stream, rate,
ff->spec->pcm_playback_channels[mode]);
if (err < 0)
return err;
err = ff->spec->protocol->allocate_resources(ff, rate);
if (err < 0)
return err;
err = amdtp_domain_set_events_per_period(&ff->domain,
frames_per_period, frames_per_buffer);
if (err < 0) {
fw_iso_resources_free(&ff->tx_resources);
fw_iso_resources_free(&ff->rx_resources);
return err;
}
}
return 0;
}
int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
{
int err;
if (ff->substreams_counter == 0)
return 0;
if (amdtp_streaming_error(&ff->tx_stream) ||
amdtp_streaming_error(&ff->rx_stream)) {
amdtp_domain_stop(&ff->domain);
finish_session(ff);
}
/*
* Regardless of current source of clock signal, drivers transfer some
* packets. Then, the device transfers packets.
*/
if (!amdtp_stream_running(&ff->rx_stream)) {
int spd = fw_parent_device(ff->unit)->max_speed;
err = ff->spec->protocol->begin_session(ff, rate);
if (err < 0)
goto error;
err = amdtp_domain_add_stream(&ff->domain, &ff->rx_stream,
ff->rx_resources.channel, spd);
if (err < 0)
goto error;
err = amdtp_domain_add_stream(&ff->domain, &ff->tx_stream,
ff->tx_resources.channel, spd);
if (err < 0)
goto error;
// NOTE: The device doesn't transfer packets unless receiving any packet. The
// sequence of tx packets includes cycle skip corresponding to empty packet or
// NODATA packet in IEC 61883-1/6. The sequence of the number of data blocks per
// packet is important for media clock recovery.
err = amdtp_domain_start(&ff->domain, 0, true, true);
if (err < 0)
goto error;
if (!amdtp_domain_wait_ready(&ff->domain, READY_TIMEOUT_MS)) {
err = -ETIMEDOUT;
goto error;
}
err = ff->spec->protocol->switch_fetching_mode(ff, true);
if (err < 0)
goto error;
}
return 0;
error:
amdtp_domain_stop(&ff->domain);
finish_session(ff);
return err;
}
void snd_ff_stream_stop_duplex(struct snd_ff *ff)
{
if (ff->substreams_counter == 0) {
amdtp_domain_stop(&ff->domain);
finish_session(ff);
fw_iso_resources_free(&ff->tx_resources);
fw_iso_resources_free(&ff->rx_resources);
}
}
void snd_ff_stream_update_duplex(struct snd_ff *ff)
{
amdtp_domain_stop(&ff->domain);
// The device discontinue to transfer packets.
amdtp_stream_pcm_abort(&ff->tx_stream);
amdtp_stream_pcm_abort(&ff->rx_stream);
}
void snd_ff_stream_lock_changed(struct snd_ff *ff)
{
ff->dev_lock_changed = true;
wake_up(&ff->hwdep_wait);
}
int snd_ff_stream_lock_try(struct snd_ff *ff)
{
int err;
spin_lock_irq(&ff->lock);
/* user land lock this */
if (ff->dev_lock_count < 0) {
err = -EBUSY;
goto end;
}
/* this is the first time */
if (ff->dev_lock_count++ == 0)
snd_ff_stream_lock_changed(ff);
err = 0;
end:
spin_unlock_irq(&ff->lock);
return err;
}
void snd_ff_stream_lock_release(struct snd_ff *ff)
{
spin_lock_irq(&ff->lock);
if (WARN_ON(ff->dev_lock_count <= 0))
goto end;
if (--ff->dev_lock_count == 0)
snd_ff_stream_lock_changed(ff);
end:
spin_unlock_irq(&ff->lock);
}
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