summaryrefslogtreecommitdiffstats
path: root/sound/firewire/motu/amdtp-motu.c
blob: cb0c967dea6318e1a246a60f56f7fac993304bd6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
/*
 * amdtp-motu.c - a part of driver for MOTU FireWire series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include <linux/slab.h>
#include <sound/pcm.h>
#include "motu.h"

#define CREATE_TRACE_POINTS
#include "amdtp-motu-trace.h"

#define CIP_FMT_MOTU		0x02
#define CIP_FMT_MOTU_TX_V3	0x22
#define MOTU_FDF_AM824		0x22

/*
 * Nominally 3125 bytes/second, but the MIDI port's clock might be
 * 1% too slow, and the bus clock 100 ppm too fast.
 */
#define MIDI_BYTES_PER_SECOND	3093

struct amdtp_motu {
	/* For timestamp processing.  */
	unsigned int quotient_ticks_per_event;
	unsigned int remainder_ticks_per_event;
	unsigned int next_ticks;
	unsigned int next_accumulated;
	unsigned int next_cycles;
	unsigned int next_seconds;

	unsigned int pcm_chunks;
	unsigned int pcm_byte_offset;

	struct snd_rawmidi_substream *midi;
	unsigned int midi_ports;
	unsigned int midi_flag_offset;
	unsigned int midi_byte_offset;

	int midi_db_count;
	unsigned int midi_db_interval;
};

int amdtp_motu_set_parameters(struct amdtp_stream *s, unsigned int rate,
			      unsigned int midi_ports,
			      struct snd_motu_packet_format *formats)
{
	static const struct {
		unsigned int quotient_ticks_per_event;
		unsigned int remainder_ticks_per_event;
	} params[] = {
		[CIP_SFC_44100]  = { 557, 123 },
		[CIP_SFC_48000]  = { 512,   0 },
		[CIP_SFC_88200]  = { 278, 282 },
		[CIP_SFC_96000]  = { 256,   0 },
		[CIP_SFC_176400] = { 139, 141 },
		[CIP_SFC_192000] = { 128,   0 },
	};
	struct amdtp_motu *p = s->protocol;
	unsigned int pcm_chunks, data_chunks, data_block_quadlets;
	unsigned int delay;
	unsigned int mode;
	int i, err;

	if (amdtp_stream_running(s))
		return -EBUSY;

	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
		if (snd_motu_clock_rates[i] == rate) {
			mode = i >> 1;
			break;
		}
	}
	if (i == ARRAY_SIZE(snd_motu_clock_rates))
		return -EINVAL;

	pcm_chunks = formats->fixed_part_pcm_chunks[mode] +
		     formats->differed_part_pcm_chunks[mode];
	data_chunks = formats->msg_chunks + pcm_chunks;

	/*
	 * Each data block includes SPH in its head. Data chunks follow with
	 * 3 byte alignment. Padding follows with zero to conform to quadlet
	 * alignment.
	 */
	data_block_quadlets = 1 + DIV_ROUND_UP(data_chunks * 3, 4);

	err = amdtp_stream_set_parameters(s, rate, data_block_quadlets);
	if (err < 0)
		return err;

	p->pcm_chunks = pcm_chunks;
	p->pcm_byte_offset = formats->pcm_byte_offset;

	p->midi_ports = midi_ports;
	p->midi_flag_offset = formats->midi_flag_offset;
	p->midi_byte_offset = formats->midi_byte_offset;

	p->midi_db_count = 0;
	p->midi_db_interval = rate / MIDI_BYTES_PER_SECOND;

	/* IEEE 1394 bus requires. */
	delay = 0x2e00;

	/* For no-data or empty packets to adjust PCM sampling frequency. */
	delay += 8000 * 3072 * s->syt_interval / rate;

	p->next_seconds = 0;
	p->next_cycles = delay / 3072;
	p->quotient_ticks_per_event = params[s->sfc].quotient_ticks_per_event;
	p->remainder_ticks_per_event = params[s->sfc].remainder_ticks_per_event;
	p->next_ticks = delay % 3072;
	p->next_accumulated = 0;

	return 0;
}

static void read_pcm_s32(struct amdtp_stream *s,
			 struct snd_pcm_runtime *runtime,
			 __be32 *buffer, unsigned int data_blocks)
{
	struct amdtp_motu *p = s->protocol;
	unsigned int channels, remaining_frames, i, c;
	u8 *byte;
	u32 *dst;

	channels = p->pcm_chunks;
	dst = (void *)runtime->dma_area +
			frames_to_bytes(runtime, s->pcm_buffer_pointer);
	remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;

	for (i = 0; i < data_blocks; ++i) {
		byte = (u8 *)buffer + p->pcm_byte_offset;

		for (c = 0; c < channels; ++c) {
			*dst = (byte[0] << 24) |
			       (byte[1] << 16) |
			       (byte[2] << 8);
			byte += 3;
			dst++;
		}
		buffer += s->data_block_quadlets;
		if (--remaining_frames == 0)
			dst = (void *)runtime->dma_area;
	}
}

static void write_pcm_s32(struct amdtp_stream *s,
			  struct snd_pcm_runtime *runtime,
			  __be32 *buffer, unsigned int data_blocks)
{
	struct amdtp_motu *p = s->protocol;
	unsigned int channels, remaining_frames, i, c;
	u8 *byte;
	const u32 *src;

	channels = p->pcm_chunks;
	src = (void *)runtime->dma_area +
			frames_to_bytes(runtime, s->pcm_buffer_pointer);
	remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;

	for (i = 0; i < data_blocks; ++i) {
		byte = (u8 *)buffer + p->pcm_byte_offset;

		for (c = 0; c < channels; ++c) {
			byte[0] = (*src >> 24) & 0xff;
			byte[1] = (*src >> 16) & 0xff;
			byte[2] = (*src >>  8) & 0xff;
			byte += 3;
			src++;
		}

		buffer += s->data_block_quadlets;
		if (--remaining_frames == 0)
			src = (void *)runtime->dma_area;
	}
}

static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer,
			      unsigned int data_blocks)
{
	struct amdtp_motu *p = s->protocol;
	unsigned int channels, i, c;
	u8 *byte;

	channels = p->pcm_chunks;

	for (i = 0; i < data_blocks; ++i) {
		byte = (u8 *)buffer + p->pcm_byte_offset;

		for (c = 0; c < channels; ++c) {
			byte[0] = 0;
			byte[1] = 0;
			byte[2] = 0;
			byte += 3;
		}

		buffer += s->data_block_quadlets;
	}
}

int amdtp_motu_add_pcm_hw_constraints(struct amdtp_stream *s,
				      struct snd_pcm_runtime *runtime)
{
	int err;

	/* TODO: how to set an constraint for exactly 24bit PCM sample? */
	err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
	if (err < 0)
		return err;

	return amdtp_stream_add_pcm_hw_constraints(s, runtime);
}

void amdtp_motu_midi_trigger(struct amdtp_stream *s, unsigned int port,
			     struct snd_rawmidi_substream *midi)
{
	struct amdtp_motu *p = s->protocol;

	if (port < p->midi_ports)
		WRITE_ONCE(p->midi, midi);
}

static void write_midi_messages(struct amdtp_stream *s, __be32 *buffer,
				unsigned int data_blocks)
{
	struct amdtp_motu *p = s->protocol;
	struct snd_rawmidi_substream *midi = READ_ONCE(p->midi);
	u8 *b;
	int i;

	for (i = 0; i < data_blocks; i++) {
		b = (u8 *)buffer;

		if (midi && p->midi_db_count == 0 &&
		    snd_rawmidi_transmit(midi, b + p->midi_byte_offset, 1) == 1) {
			b[p->midi_flag_offset] = 0x01;
		} else {
			b[p->midi_byte_offset] = 0x00;
			b[p->midi_flag_offset] = 0x00;
		}

		buffer += s->data_block_quadlets;

		if (--p->midi_db_count < 0)
			p->midi_db_count = p->midi_db_interval;
	}
}

static void read_midi_messages(struct amdtp_stream *s, __be32 *buffer,
			       unsigned int data_blocks)
{
	struct amdtp_motu *p = s->protocol;
	struct snd_rawmidi_substream *midi;
	u8 *b;
	int i;

	for (i = 0; i < data_blocks; i++) {
		b = (u8 *)buffer;
		midi = READ_ONCE(p->midi);

		if (midi && (b[p->midi_flag_offset] & 0x01))
			snd_rawmidi_receive(midi, b + p->midi_byte_offset, 1);

		buffer += s->data_block_quadlets;
	}
}

/* For tracepoints. */
static void __maybe_unused copy_sph(u32 *frames, __be32 *buffer,
				    unsigned int data_blocks,
				    unsigned int data_block_quadlets)
{
	unsigned int i;

	for (i = 0; i < data_blocks; ++i) {
		*frames = be32_to_cpu(*buffer);
		buffer += data_block_quadlets;
		frames++;
	}
}

/* For tracepoints. */
static void __maybe_unused copy_message(u64 *frames, __be32 *buffer,
					unsigned int data_blocks,
					unsigned int data_block_quadlets)
{
	unsigned int i;

	/* This is just for v2/v3 protocol. */
	for (i = 0; i < data_blocks; ++i) {
		*frames = (be32_to_cpu(buffer[1]) << 16) |
			  (be32_to_cpu(buffer[2]) >> 16);
		buffer += data_block_quadlets;
		frames++;
	}
}

static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
				__be32 *buffer, unsigned int data_blocks,
				unsigned int *syt)
{
	struct amdtp_motu *p = s->protocol;
	struct snd_pcm_substream *pcm;

	trace_in_data_block_sph(s, data_blocks, buffer);
	trace_in_data_block_message(s, data_blocks, buffer);

	if (p->midi_ports)
		read_midi_messages(s, buffer, data_blocks);

	pcm = READ_ONCE(s->pcm);
	if (data_blocks > 0 && pcm)
		read_pcm_s32(s, pcm->runtime, buffer, data_blocks);

	return data_blocks;
}

static inline void compute_next_elapse_from_start(struct amdtp_motu *p)
{
	p->next_accumulated += p->remainder_ticks_per_event;
	if (p->next_accumulated >= 441) {
		p->next_accumulated -= 441;
		p->next_ticks++;
	}

	p->next_ticks += p->quotient_ticks_per_event;
	if (p->next_ticks >= 3072) {
		p->next_ticks -= 3072;
		p->next_cycles++;
	}

	if (p->next_cycles >= 8000) {
		p->next_cycles -= 8000;
		p->next_seconds++;
	}

	if (p->next_seconds >= 128)
		p->next_seconds -= 128;
}

static void write_sph(struct amdtp_stream *s, __be32 *buffer,
		      unsigned int data_blocks)
{
	struct amdtp_motu *p = s->protocol;
	unsigned int next_cycles;
	unsigned int i;
	u32 sph;

	for (i = 0; i < data_blocks; i++) {
		next_cycles = (s->start_cycle + p->next_cycles) % 8000;
		sph = ((next_cycles << 12) | p->next_ticks) & 0x01ffffff;
		*buffer = cpu_to_be32(sph);

		compute_next_elapse_from_start(p);

		buffer += s->data_block_quadlets;
	}
}

static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
				__be32 *buffer, unsigned int data_blocks,
				unsigned int *syt)
{
	struct amdtp_motu *p = (struct amdtp_motu *)s->protocol;
	struct snd_pcm_substream *pcm;

	/* Not used. */
	*syt = 0xffff;

	/* TODO: how to interact control messages between userspace? */

	if (p->midi_ports)
		write_midi_messages(s, buffer, data_blocks);

	pcm = READ_ONCE(s->pcm);
	if (pcm)
		write_pcm_s32(s, pcm->runtime, buffer, data_blocks);
	else
		write_pcm_silence(s, buffer, data_blocks);

	write_sph(s, buffer, data_blocks);

	trace_out_data_block_sph(s, data_blocks, buffer);
	trace_out_data_block_message(s, data_blocks, buffer);

	return data_blocks;
}

int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit,
		    enum amdtp_stream_direction dir,
		    const struct snd_motu_protocol *const protocol)
{
	amdtp_stream_process_data_blocks_t process_data_blocks;
	int fmt = CIP_FMT_MOTU;
	int flags = CIP_BLOCKING;
	int err;

	if (dir == AMDTP_IN_STREAM) {
		process_data_blocks = process_tx_data_blocks;

		/*
		 * Units of version 3 transmits packets with invalid CIP header
		 * against IEC 61883-1.
		 */
		if (protocol == &snd_motu_protocol_v3) {
			flags |= CIP_WRONG_DBS |
				 CIP_SKIP_DBC_ZERO_CHECK |
				 CIP_HEADER_WITHOUT_EOH;
			fmt = CIP_FMT_MOTU_TX_V3;
		}

		if (protocol == &snd_motu_protocol_v2) {
			// 8pre has some quirks.
			flags |= CIP_WRONG_DBS |
				 CIP_SKIP_DBC_ZERO_CHECK;
		}
	} else {
		process_data_blocks = process_rx_data_blocks;
		flags |= CIP_DBC_IS_END_EVENT;
	}

	err = amdtp_stream_init(s, unit, dir, flags, fmt, process_data_blocks,
				sizeof(struct amdtp_motu));
	if (err < 0)
		return err;

	s->sph = 1;
	s->fdf = MOTU_FDF_AM824;

	return 0;
}