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
|
// 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, ®,
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, ®,
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, ®,
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, ®,
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);
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, ®,
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, ®,
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);
}
|