[linux-2.6-block.git] / sound / firewire / motu / motu-stream.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * motu-stream.c - a part of driver for MOTU FireWire series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
 */

#include "motu.h"

#define	CALLBACK_TIMEOUT	200

#define ISOC_COMM_CONTROL_OFFSET		0x0b00
#define  ISOC_COMM_CONTROL_MASK			0xffff0000
#define  CHANGE_RX_ISOC_COMM_STATE		0x80000000
#define  RX_ISOC_COMM_IS_ACTIVATED		0x40000000
#define  RX_ISOC_COMM_CHANNEL_MASK		0x3f000000
#define  RX_ISOC_COMM_CHANNEL_SHIFT		24
#define  CHANGE_TX_ISOC_COMM_STATE		0x00800000
#define  TX_ISOC_COMM_IS_ACTIVATED		0x00400000
#define  TX_ISOC_COMM_CHANNEL_MASK		0x003f0000
#define  TX_ISOC_COMM_CHANNEL_SHIFT		16

#define PACKET_FORMAT_OFFSET			0x0b10
#define  TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS	0x00000080
#define  RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS	0x00000040
#define  TX_PACKET_TRANSMISSION_SPEED_MASK	0x0000000f

static int keep_resources(struct snd_motu *motu, unsigned int rate,
			  struct amdtp_stream *stream)
{
	struct fw_iso_resources *resources;
	struct snd_motu_packet_format *packet_format;
	unsigned int midi_ports = 0;
	int err;

	if (stream == &motu->rx_stream) {
		resources = &motu->rx_resources;
		packet_format = &motu->rx_packet_formats;

		if ((motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_2ND_Q) ||
		    (motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_3RD_Q))
			midi_ports = 1;
	} else {
		resources = &motu->tx_resources;
		packet_format = &motu->tx_packet_formats;

		if ((motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_2ND_Q) ||
		    (motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_3RD_Q))
			midi_ports = 1;
	}

	err = amdtp_motu_set_parameters(stream, rate, midi_ports,
					packet_format);
	if (err < 0)
		return err;

	return fw_iso_resources_allocate(resources,
				amdtp_stream_get_max_payload(stream),
				fw_parent_device(motu->unit)->max_speed);
}

static int begin_session(struct snd_motu *motu)
{
	__be32 reg;
	u32 data;
	int err;

	// Configure the unit to start isochronous communication.
	err = snd_motu_transaction_read(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
					sizeof(reg));
	if (err < 0)
		return err;
	data = be32_to_cpu(reg) & ~ISOC_COMM_CONTROL_MASK;

	data |= CHANGE_RX_ISOC_COMM_STATE | RX_ISOC_COMM_IS_ACTIVATED |
		(motu->rx_resources.channel << RX_ISOC_COMM_CHANNEL_SHIFT) |
		CHANGE_TX_ISOC_COMM_STATE | TX_ISOC_COMM_IS_ACTIVATED |
		(motu->tx_resources.channel << TX_ISOC_COMM_CHANNEL_SHIFT);

	reg = cpu_to_be32(data);
	return snd_motu_transaction_write(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
					  sizeof(reg));
}

static void finish_session(struct snd_motu *motu)
{
	__be32 reg;
	u32 data;
	int err;

	err = motu->spec->protocol->switch_fetching_mode(motu, false);
	if (err < 0)
		return;

	err = snd_motu_transaction_read(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
					sizeof(reg));
	if (err < 0)
		return;
	data = be32_to_cpu(reg);

	data &= ~(RX_ISOC_COMM_IS_ACTIVATED | TX_ISOC_COMM_IS_ACTIVATED);
	data |= CHANGE_RX_ISOC_COMM_STATE | CHANGE_TX_ISOC_COMM_STATE;

	reg = cpu_to_be32(data);
	snd_motu_transaction_write(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
				   sizeof(reg));
}

int snd_motu_stream_cache_packet_formats(struct snd_motu *motu)
{
	int err;

	err = motu->spec->protocol->cache_packet_formats(motu);
	if (err < 0)
		return err;

	if (motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_2ND_Q) {
		motu->tx_packet_formats.midi_flag_offset = 4;
		motu->tx_packet_formats.midi_byte_offset = 6;
	} else if (motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_3RD_Q) {
		motu->tx_packet_formats.midi_flag_offset = 8;
		motu->tx_packet_formats.midi_byte_offset = 7;
	}

	if (motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_2ND_Q) {
		motu->rx_packet_formats.midi_flag_offset = 4;
		motu->rx_packet_formats.midi_byte_offset = 6;
	} else if (motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_3RD_Q) {
		motu->rx_packet_formats.midi_flag_offset = 8;
		motu->rx_packet_formats.midi_byte_offset = 7;
	}

	return 0;
}

int snd_motu_stream_reserve_duplex(struct snd_motu *motu, unsigned int rate,
				   unsigned int frames_per_period)
{
	unsigned int curr_rate;
	int err;

	err = motu->spec->protocol->get_clock_rate(motu, &curr_rate);
	if (err < 0)
		return err;
	if (rate == 0)
		rate = curr_rate;

	if (motu->substreams_counter == 0 || curr_rate != rate) {
		amdtp_domain_stop(&motu->domain);
		finish_session(motu);

		fw_iso_resources_free(&motu->tx_resources);
		fw_iso_resources_free(&motu->rx_resources);

		err = motu->spec->protocol->set_clock_rate(motu, rate);
		if (err < 0) {
			dev_err(&motu->unit->device,
				"fail to set sampling rate: %d\n", err);
			return err;
		}

		err = snd_motu_stream_cache_packet_formats(motu);
		if (err < 0)
			return err;

		err = keep_resources(motu, rate, &motu->tx_stream);
		if (err < 0)
			return err;

		err = keep_resources(motu, rate, &motu->rx_stream);
		if (err < 0) {
			fw_iso_resources_free(&motu->tx_resources);
			return err;
		}

		err = amdtp_domain_set_events_per_period(&motu->domain,
							 frames_per_period, 0);
		if (err < 0) {
			fw_iso_resources_free(&motu->tx_resources);
			fw_iso_resources_free(&motu->rx_resources);
			return err;
		}
	}

	return 0;
}

static int ensure_packet_formats(struct snd_motu *motu)
{
	__be32 reg;
	u32 data;
	int err;

	err = snd_motu_transaction_read(motu, PACKET_FORMAT_OFFSET, &reg,
					sizeof(reg));
	if (err < 0)
		return err;
	data = be32_to_cpu(reg);

	data &= ~(TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS |
		  RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS|
		  TX_PACKET_TRANSMISSION_SPEED_MASK);
	if (motu->tx_packet_formats.differed_part_pcm_chunks[0] == 0)
		data |= TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS;
	if (motu->rx_packet_formats.differed_part_pcm_chunks[0] == 0)
		data |= RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS;
	data |= fw_parent_device(motu->unit)->max_speed;

	reg = cpu_to_be32(data);
	return snd_motu_transaction_write(motu, PACKET_FORMAT_OFFSET, &reg,
					  sizeof(reg));
}

int snd_motu_stream_start_duplex(struct snd_motu *motu)
{
	unsigned int generation = motu->rx_resources.generation;
	int err = 0;

	if (motu->substreams_counter == 0)
		return 0;

	if (amdtp_streaming_error(&motu->rx_stream) ||
	    amdtp_streaming_error(&motu->tx_stream)) {
		amdtp_domain_stop(&motu->domain);
		finish_session(motu);
	}

	if (generation != fw_parent_device(motu->unit)->card->generation) {
		err = fw_iso_resources_update(&motu->rx_resources);
		if (err < 0)
			return err;

		err = fw_iso_resources_update(&motu->tx_resources);
		if (err < 0)
			return err;
	}

	if (!amdtp_stream_running(&motu->rx_stream)) {
		int spd = fw_parent_device(motu->unit)->max_speed;

		err = ensure_packet_formats(motu);
		if (err < 0)
			return err;

		err = begin_session(motu);
		if (err < 0) {
			dev_err(&motu->unit->device,
				"fail to start isochronous comm: %d\n", err);
			goto stop_streams;
		}

		err = amdtp_domain_add_stream(&motu->domain, &motu->tx_stream,
					      motu->tx_resources.channel, spd);
		if (err < 0)
			goto stop_streams;

		err = amdtp_domain_add_stream(&motu->domain, &motu->rx_stream,
					      motu->rx_resources.channel, spd);
		if (err < 0)
			goto stop_streams;

		err = amdtp_domain_start(&motu->domain);
		if (err < 0)
			goto stop_streams;

		if (!amdtp_stream_wait_callback(&motu->tx_stream,
						CALLBACK_TIMEOUT) ||
		    !amdtp_stream_wait_callback(&motu->rx_stream,
						CALLBACK_TIMEOUT)) {
			err = -ETIMEDOUT;
			goto stop_streams;
		}

		err = motu->spec->protocol->switch_fetching_mode(motu, true);
		if (err < 0) {
			dev_err(&motu->unit->device,
				"fail to enable frame fetching: %d\n", err);
			goto stop_streams;
		}
	}

	return 0;

stop_streams:
	amdtp_domain_stop(&motu->domain);
	finish_session(motu);
	return err;
}

void snd_motu_stream_stop_duplex(struct snd_motu *motu)
{
	if (motu->substreams_counter == 0) {
		amdtp_domain_stop(&motu->domain);
		finish_session(motu);

		fw_iso_resources_free(&motu->tx_resources);
		fw_iso_resources_free(&motu->rx_resources);
	}
}

static int init_stream(struct snd_motu *motu, struct amdtp_stream *s)
{
	struct fw_iso_resources *resources;
	enum amdtp_stream_direction dir;
	int err;

	if (s == &motu->tx_stream) {
		resources = &motu->tx_resources;
		dir = AMDTP_IN_STREAM;
	} else {
		resources = &motu->rx_resources;
		dir = AMDTP_OUT_STREAM;
	}

	err = fw_iso_resources_init(resources, motu->unit);
	if (err < 0)
		return err;

	err = amdtp_motu_init(s, motu->unit, dir, motu->spec->protocol);
	if (err < 0)
		fw_iso_resources_destroy(resources);

	return err;
}

static void destroy_stream(struct snd_motu *motu, struct amdtp_stream *s)
{
	amdtp_stream_destroy(s);

	if (s == &motu->tx_stream)
		fw_iso_resources_destroy(&motu->tx_resources);
	else
		fw_iso_resources_destroy(&motu->rx_resources);
}

int snd_motu_stream_init_duplex(struct snd_motu *motu)
{
	int err;

	err = init_stream(motu, &motu->tx_stream);
	if (err < 0)
		return err;

	err = init_stream(motu, &motu->rx_stream);
	if (err < 0) {
		destroy_stream(motu, &motu->tx_stream);
		return err;
	}

	err = amdtp_domain_init(&motu->domain);
	if (err < 0) {
		destroy_stream(motu, &motu->tx_stream);
		destroy_stream(motu, &motu->rx_stream);
	}

	return err;
}

// This function should be called before starting streams or after stopping
// streams.
void snd_motu_stream_destroy_duplex(struct snd_motu *motu)
{
	amdtp_domain_destroy(&motu->domain);

	destroy_stream(motu, &motu->rx_stream);
	destroy_stream(motu, &motu->tx_stream);

	motu->substreams_counter = 0;
}

static void motu_lock_changed(struct snd_motu *motu)
{
	motu->dev_lock_changed = true;
	wake_up(&motu->hwdep_wait);
}

int snd_motu_stream_lock_try(struct snd_motu *motu)
{
	int err;

	spin_lock_irq(&motu->lock);

	if (motu->dev_lock_count < 0) {
		err = -EBUSY;
		goto out;
	}

	if (motu->dev_lock_count++ == 0)
		motu_lock_changed(motu);
	err = 0;
out:
	spin_unlock_irq(&motu->lock);
	return err;
}

void snd_motu_stream_lock_release(struct snd_motu *motu)
{
	spin_lock_irq(&motu->lock);

	if (WARN_ON(motu->dev_lock_count <= 0))
		goto out;

	if (--motu->dev_lock_count == 0)
		motu_lock_changed(motu);
out:
	spin_unlock_irq(&motu->lock);
}
Commit	Line	Data
da607e19	1	// SPDX-License-Identifier: GPL-2.0-only
9b2bb4f2 TS	2	/*
	3	* motu-stream.c - a part of driver for MOTU FireWire series
	4	*
	5	* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
9b2bb4f2 TS	6	*/
	7
	8	#include "motu.h"
	9
	10	#define CALLBACK_TIMEOUT 200
	11
	12	#define ISOC_COMM_CONTROL_OFFSET 0x0b00
	13	#define ISOC_COMM_CONTROL_MASK 0xffff0000
	14	#define CHANGE_RX_ISOC_COMM_STATE 0x80000000
	15	#define RX_ISOC_COMM_IS_ACTIVATED 0x40000000
	16	#define RX_ISOC_COMM_CHANNEL_MASK 0x3f000000
	17	#define RX_ISOC_COMM_CHANNEL_SHIFT 24
	18	#define CHANGE_TX_ISOC_COMM_STATE 0x00800000
	19	#define TX_ISOC_COMM_IS_ACTIVATED 0x00400000
	20	#define TX_ISOC_COMM_CHANNEL_MASK 0x003f0000
	21	#define TX_ISOC_COMM_CHANNEL_SHIFT 16
	22
	23	#define PACKET_FORMAT_OFFSET 0x0b10
	24	#define TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS 0x00000080
	25	#define RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS 0x00000040
	26	#define TX_PACKET_TRANSMISSION_SPEED_MASK 0x0000000f
	27
8350132e TS	28	static int keep_resources(struct snd_motu *motu, unsigned int rate,
8350132e TS	29	struct amdtp_stream *stream)
9b2bb4f2	30	{
8350132e TS	31	struct fw_iso_resources *resources;
8350132e TS	32	struct snd_motu_packet_format *packet_format;
9e796e7d	33	unsigned int midi_ports = 0;
9b2bb4f2 TS	34	int err;
9b2bb4f2 TS	35
8350132e TS	36	if (stream == &motu->rx_stream) {
	37	resources = &motu->rx_resources;
	38	packet_format = &motu->rx_packet_formats;
9e796e7d	39
8350132e TS	40	if ((motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_2ND_Q) \|\|
	41	(motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_3RD_Q))
	42	midi_ports = 1;
	43	} else {
	44	resources = &motu->tx_resources;
	45	packet_format = &motu->tx_packet_formats;
9b2bb4f2	46
8350132e TS	47	if ((motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_2ND_Q) \|\|
	48	(motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_3RD_Q))
	49	midi_ports = 1;
	50	}
8b460c76	51
8350132e TS	52	err = amdtp_motu_set_parameters(stream, rate, midi_ports,
8350132e TS	53	packet_format);
9b2bb4f2 TS	54	if (err < 0)
	55	return err;
	56
8350132e TS	57	return fw_iso_resources_allocate(resources,
8350132e TS	58	amdtp_stream_get_max_payload(stream),
9b2bb4f2	59	fw_parent_device(motu->unit)->max_speed);
8350132e TS	60	}
8350132e TS	61
8edc56ec	62	static int begin_session(struct snd_motu *motu)
8350132e TS	63	{
	64	__be32 reg;
	65	u32 data;
	66	int err;
	67
8350132e	68	// Configure the unit to start isochronous communication.
9b2bb4f2 TS	69	err = snd_motu_transaction_read(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
	70	sizeof(reg));
	71	if (err < 0)
	72	return err;
	73	data = be32_to_cpu(reg) & ~ISOC_COMM_CONTROL_MASK;
	74
	75	data \|= CHANGE_RX_ISOC_COMM_STATE \| RX_ISOC_COMM_IS_ACTIVATED \|
	76	(motu->rx_resources.channel << RX_ISOC_COMM_CHANNEL_SHIFT) \|
	77	CHANGE_TX_ISOC_COMM_STATE \| TX_ISOC_COMM_IS_ACTIVATED \|
	78	(motu->tx_resources.channel << TX_ISOC_COMM_CHANNEL_SHIFT);
	79
	80	reg = cpu_to_be32(data);
	81	return snd_motu_transaction_write(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
	82	sizeof(reg));
	83	}
	84
b66ab142	85	static void finish_session(struct snd_motu *motu)
9b2bb4f2 TS	86	{
	87	__be32 reg;
	88	u32 data;
	89	int err;
	90
	91	err = motu->spec->protocol->switch_fetching_mode(motu, false);
	92	if (err < 0)
	93	return;
	94
	95	err = snd_motu_transaction_read(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
	96	sizeof(reg));
	97	if (err < 0)
	98	return;
	99	data = be32_to_cpu(reg);
	100
	101	data &= ~(RX_ISOC_COMM_IS_ACTIVATED \| TX_ISOC_COMM_IS_ACTIVATED);
	102	data \|= CHANGE_RX_ISOC_COMM_STATE \| CHANGE_TX_ISOC_COMM_STATE;
	103
	104	reg = cpu_to_be32(data);
	105	snd_motu_transaction_write(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
	106	sizeof(reg));
9b2bb4f2 TS	107	}
9b2bb4f2 TS	108
8b460c76 TS	109	int snd_motu_stream_cache_packet_formats(struct snd_motu *motu)
	110	{
	111	int err;
	112
	113	err = motu->spec->protocol->cache_packet_formats(motu);
	114	if (err < 0)
	115	return err;
	116
	117	if (motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_2ND_Q) {
	118	motu->tx_packet_formats.midi_flag_offset = 4;
	119	motu->tx_packet_formats.midi_byte_offset = 6;
	120	} else if (motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_3RD_Q) {
	121	motu->tx_packet_formats.midi_flag_offset = 8;
	122	motu->tx_packet_formats.midi_byte_offset = 7;
	123	}
	124
	125	if (motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_2ND_Q) {
	126	motu->rx_packet_formats.midi_flag_offset = 4;
	127	motu->rx_packet_formats.midi_byte_offset = 6;
	128	} else if (motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_3RD_Q) {
	129	motu->rx_packet_formats.midi_flag_offset = 8;
	130	motu->rx_packet_formats.midi_byte_offset = 7;
	131	}
	132
	133	return 0;
	134	}
	135
0d39cd0e TS	136	int snd_motu_stream_reserve_duplex(struct snd_motu *motu, unsigned int rate,
0d39cd0e TS	137	unsigned int frames_per_period)
8edc56ec TS	138	{
	139	unsigned int curr_rate;
	140	int err;
	141
	142	err = motu->spec->protocol->get_clock_rate(motu, &curr_rate);
	143	if (err < 0)
	144	return err;
	145	if (rate == 0)
	146	rate = curr_rate;
	147
	148	if (motu->substreams_counter == 0 \|\| curr_rate != rate) {
ccc6c1b0	149	amdtp_domain_stop(&motu->domain);
8edc56ec TS	150	finish_session(motu);
	151
	152	fw_iso_resources_free(&motu->tx_resources);
	153	fw_iso_resources_free(&motu->rx_resources);
	154
	155	err = motu->spec->protocol->set_clock_rate(motu, rate);
	156	if (err < 0) {
	157	dev_err(&motu->unit->device,
	158	"fail to set sampling rate: %d\n", err);
	159	return err;
	160	}
	161
	162	err = snd_motu_stream_cache_packet_formats(motu);
	163	if (err < 0)
	164	return err;
	165
	166	err = keep_resources(motu, rate, &motu->tx_stream);
	167	if (err < 0)
	168	return err;
	169
	170	err = keep_resources(motu, rate, &motu->rx_stream);
	171	if (err < 0) {
	172	fw_iso_resources_free(&motu->tx_resources);
	173	return err;
	174	}
0d39cd0e TS	175
0d39cd0e TS	176	err = amdtp_domain_set_events_per_period(&motu->domain,
a0e02331	177	frames_per_period, 0);
0d39cd0e TS	178	if (err < 0) {
	179	fw_iso_resources_free(&motu->tx_resources);
	180	fw_iso_resources_free(&motu->rx_resources);
	181	return err;
	182	}
8edc56ec TS	183	}
	184
	185	return 0;
	186	}
	187
9b2bb4f2 TS	188	static int ensure_packet_formats(struct snd_motu *motu)
	189	{
	190	__be32 reg;
	191	u32 data;
	192	int err;
	193
	194	err = snd_motu_transaction_read(motu, PACKET_FORMAT_OFFSET, &reg,
	195	sizeof(reg));
	196	if (err < 0)
	197	return err;
	198	data = be32_to_cpu(reg);
	199
	200	data &= ~(TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS \|
	201	RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS\|
	202	TX_PACKET_TRANSMISSION_SPEED_MASK);
	203	if (motu->tx_packet_formats.differed_part_pcm_chunks[0] == 0)
	204	data \|= TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS;
	205	if (motu->rx_packet_formats.differed_part_pcm_chunks[0] == 0)
	206	data \|= RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS;
	207	data \|= fw_parent_device(motu->unit)->max_speed;
	208
	209	reg = cpu_to_be32(data);
	210	return snd_motu_transaction_write(motu, PACKET_FORMAT_OFFSET, &reg,
	211	sizeof(reg));
	212	}
	213
8edc56ec	214	int snd_motu_stream_start_duplex(struct snd_motu *motu)
9b2bb4f2	215	{
2d103420	216	unsigned int generation = motu->rx_resources.generation;
9b2bb4f2 TS	217	int err = 0;
9b2bb4f2 TS	218
18f26034	219	if (motu->substreams_counter == 0)
9b2bb4f2 TS	220	return 0;
9b2bb4f2 TS	221
8edc56ec	222	if (amdtp_streaming_error(&motu->rx_stream) \|\|
ccc6c1b0 TS	223	amdtp_streaming_error(&motu->tx_stream)) {
ccc6c1b0 TS	224	amdtp_domain_stop(&motu->domain);
b66ab142	225	finish_session(motu);
ccc6c1b0	226	}
9b2bb4f2	227
2d103420 TS	228	if (generation != fw_parent_device(motu->unit)->card->generation) {
	229	err = fw_iso_resources_update(&motu->rx_resources);
	230	if (err < 0)
	231	return err;
	232
	233	err = fw_iso_resources_update(&motu->tx_resources);
	234	if (err < 0)
	235	return err;
	236	}
	237
9b2bb4f2	238	if (!amdtp_stream_running(&motu->rx_stream)) {
ccc6c1b0 TS	239	int spd = fw_parent_device(motu->unit)->max_speed;
ccc6c1b0 TS	240
9b2bb4f2 TS	241	err = ensure_packet_formats(motu);
	242	if (err < 0)
	243	return err;
	244
8edc56ec	245	err = begin_session(motu);
9b2bb4f2 TS	246	if (err < 0) {
	247	dev_err(&motu->unit->device,
	248	"fail to start isochronous comm: %d\n", err);
f16e666b	249	goto stop_streams;
9b2bb4f2 TS	250	}
9b2bb4f2 TS	251
ccc6c1b0 TS	252	err = amdtp_domain_add_stream(&motu->domain, &motu->tx_stream,
	253	motu->tx_resources.channel, spd);
	254	if (err < 0)
f16e666b	255	goto stop_streams;
9b2bb4f2	256
ccc6c1b0 TS	257	err = amdtp_domain_add_stream(&motu->domain, &motu->rx_stream,
	258	motu->rx_resources.channel, spd);
	259	if (err < 0)
	260	goto stop_streams;
	261
	262	err = amdtp_domain_start(&motu->domain);
	263	if (err < 0)
	264	goto stop_streams;
	265
	266	if (!amdtp_stream_wait_callback(&motu->tx_stream,
	267	CALLBACK_TIMEOUT) \|\|
	268	!amdtp_stream_wait_callback(&motu->rx_stream,
	269	CALLBACK_TIMEOUT)) {
	270	err = -ETIMEDOUT;
f16e666b	271	goto stop_streams;
9b2bb4f2	272	}
9b2bb4f2	273
ccc6c1b0	274	err = motu->spec->protocol->switch_fetching_mode(motu, true);
9b2bb4f2 TS	275	if (err < 0) {
9b2bb4f2 TS	276	dev_err(&motu->unit->device,
ccc6c1b0	277	"fail to enable frame fetching: %d\n", err);
f16e666b	278	goto stop_streams;
9b2bb4f2 TS	279	}
	280	}
	281
	282	return 0;
f16e666b ME	283
f16e666b ME	284	stop_streams:
ccc6c1b0	285	amdtp_domain_stop(&motu->domain);
b66ab142	286	finish_session(motu);
f16e666b	287	return err;
9b2bb4f2 TS	288	}
	289
	290	void snd_motu_stream_stop_duplex(struct snd_motu *motu)
	291	{
eccd895c	292	if (motu->substreams_counter == 0) {
ccc6c1b0	293	amdtp_domain_stop(&motu->domain);
ec694fba	294	finish_session(motu);
eccd895c TS	295
	296	fw_iso_resources_free(&motu->tx_resources);
	297	fw_iso_resources_free(&motu->rx_resources);
	298	}
9b2bb4f2 TS	299	}
9b2bb4f2 TS	300
39e522a5	301	static int init_stream(struct snd_motu motu, struct amdtp_stream s)
9b2bb4f2	302	{
9b2bb4f2	303	struct fw_iso_resources *resources;
39e522a5 TS	304	enum amdtp_stream_direction dir;
39e522a5 TS	305	int err;
9b2bb4f2	306
39e522a5	307	if (s == &motu->tx_stream) {
9b2bb4f2	308	resources = &motu->tx_resources;
39e522a5	309	dir = AMDTP_IN_STREAM;
9b2bb4f2	310	} else {
9b2bb4f2	311	resources = &motu->rx_resources;
39e522a5	312	dir = AMDTP_OUT_STREAM;
9b2bb4f2 TS	313	}
	314
	315	err = fw_iso_resources_init(resources, motu->unit);
	316	if (err < 0)
	317	return err;
	318
39e522a5 TS	319	err = amdtp_motu_init(s, motu->unit, dir, motu->spec->protocol);
39e522a5 TS	320	if (err < 0)
9b2bb4f2	321	fw_iso_resources_destroy(resources);
9b2bb4f2 TS	322
	323	return err;
	324	}
	325
39e522a5	326	static void destroy_stream(struct snd_motu motu, struct amdtp_stream s)
9b2bb4f2	327	{
39e522a5	328	amdtp_stream_destroy(s);
9b2bb4f2	329
39e522a5 TS	330	if (s == &motu->tx_stream)
	331	fw_iso_resources_destroy(&motu->tx_resources);
	332	else
	333	fw_iso_resources_destroy(&motu->rx_resources);
9b2bb4f2 TS	334	}
	335
	336	int snd_motu_stream_init_duplex(struct snd_motu *motu)
	337	{
	338	int err;
	339
39e522a5	340	err = init_stream(motu, &motu->tx_stream);
9b2bb4f2 TS	341	if (err < 0)
	342	return err;
	343
39e522a5	344	err = init_stream(motu, &motu->rx_stream);
ccc6c1b0	345	if (err < 0) {
39e522a5	346	destroy_stream(motu, &motu->tx_stream);
ccc6c1b0 TS	347	return err;
	348	}
	349
	350	err = amdtp_domain_init(&motu->domain);
	351	if (err < 0) {
	352	destroy_stream(motu, &motu->tx_stream);
	353	destroy_stream(motu, &motu->rx_stream);
	354	}
9b2bb4f2 TS	355
	356	return err;
	357	}
	358
ccc6c1b0 TS	359	// This function should be called before starting streams or after stopping
ccc6c1b0 TS	360	// streams.
9b2bb4f2 TS	361	void snd_motu_stream_destroy_duplex(struct snd_motu *motu)
9b2bb4f2 TS	362	{
ccc6c1b0 TS	363	amdtp_domain_destroy(&motu->domain);
ccc6c1b0 TS	364
39e522a5 TS	365	destroy_stream(motu, &motu->rx_stream);
39e522a5 TS	366	destroy_stream(motu, &motu->tx_stream);
9b2bb4f2	367
18f26034	368	motu->substreams_counter = 0;
9b2bb4f2	369	}
71c37977 TS	370
	371	static void motu_lock_changed(struct snd_motu *motu)
	372	{
	373	motu->dev_lock_changed = true;
	374	wake_up(&motu->hwdep_wait);
	375	}
	376
	377	int snd_motu_stream_lock_try(struct snd_motu *motu)
	378	{
	379	int err;
	380
	381	spin_lock_irq(&motu->lock);
	382
	383	if (motu->dev_lock_count < 0) {
	384	err = -EBUSY;
	385	goto out;
	386	}
	387
	388	if (motu->dev_lock_count++ == 0)
	389	motu_lock_changed(motu);
	390	err = 0;
	391	out:
	392	spin_unlock_irq(&motu->lock);
	393	return err;
	394	}
	395
	396	void snd_motu_stream_lock_release(struct snd_motu *motu)
	397	{
	398	spin_lock_irq(&motu->lock);
	399
	400	if (WARN_ON(motu->dev_lock_count <= 0))
	401	goto out;
	402
	403	if (--motu->dev_lock_count == 0)
	404	motu_lock_changed(motu);
	405	out:
	406	spin_unlock_irq(&motu->lock);
	407	}