1 // SPDX-License-Identifier: GPL-2.0-only
2 // motu-protocol-v1.c - a part of driver for MOTU FireWire series
3 //
4 // Copyright (c) 2021 Takashi Sakamoto <o-takashi@sakamocchi.jp>
5
6 #include "motu.h"
7
8 #include <linux/delay.h>
9
10 // Status register for MOTU 828 (0x'ffff'f000'0b00).
11 //
12 // 0xffff0000: ISOC_COMM_CONTROL_MASK in motu-stream.c.
13 // 0x00008000: mode of optical input interface.
14 // 0x00008000: for S/PDIF signal.
15 // 0x00000000: disabled or for ADAT signal.
16 // 0x00004000: mode of optical output interface.
17 // 0x00004000: for S/PDIF signal.
18 // 0x00000000: disabled or for ADAT signal.
19 // 0x00003f00: monitor input mode.
20 // 0x00000800: analog-1/2
21 // 0x00001a00: analog-3/4
22 // 0x00002c00: analog-5/6
23 // 0x00003e00: analog-7/8
24 // 0x00000000: analog-1
25 // 0x00000900: analog-2
26 // 0x00001200: analog-3
27 // 0x00001b00: analog-4
28 // 0x00002400: analog-5
29 // 0x00002d00: analog-6
30 // 0x00003600: analog-7
31 // 0x00003f00: analog-8
32 // 0x00000080: enable stream input.
33 // 0x00000040: disable monitor input.
34 // 0x00000008: enable main out.
35 // 0x00000004: rate of sampling clock.
36 // 0x00000004: 48.0 kHz
37 // 0x00000000: 44.1 kHz
38 // 0x00000023: source of sampling clock.
39 // 0x00000003: source packet header (SPH)
40 // 0x00000002: S/PDIF on optical/coaxial interface.
41 // 0x00000021: ADAT on optical interface
42 // 0x00000001: ADAT on Dsub 9pin
43 // 0x00000000: internal
44
45 #define CLK_828_STATUS_OFFSET 0x0b00
46 #define CLK_828_STATUS_MASK 0x0000ffff
47 #define CLK_828_STATUS_FLAG_OPT_IN_IFACE_IS_SPDIF 0x00008000
48 #define CLK_828_STATUS_FLAG_OPT_OUT_IFACE_IS_SPDIF 0x00004000
49 #define CLK_828_STATUS_FLAG_FETCH_PCM_FRAMES 0x00000080
50 #define CLK_828_STATUS_FLAG_ENABLE_OUTPUT 0x00000008
51 #define CLK_828_STATUS_FLAG_RATE_48000 0x00000004
52 #define CLK_828_STATUS_MASK_SRC 0x00000023
53 #define CLK_828_STATUS_FLAG_SRC_ADAT_ON_OPT 0x00000021
54 #define CLK_828_STATUS_FLAG_SRC_SPH 0x00000003
55 #define CLK_828_STATUS_FLAG_SRC_SPDIF 0x00000002
56 #define CLK_828_STATUS_FLAG_SRC_ADAT_ON_DSUB 0x00000001
57 #define CLK_828_STATUS_FLAG_SRC_INTERNAL 0x00000000
58
59 // Status register for MOTU 896 (0x'ffff'f000'0b14).
60 //
61 // 0xf0000000: enable physical and stream input to DAC.
62 // 0x80000000: disable
63 // 0x40000000: disable
64 // 0x20000000: enable (prior to the other bits)
65 // 0x10000000: disable
66 // 0x00000000: disable
67 // 0x08000000: speed of word clock signal output on BNC interface.
68 // 0x00000000: force to low rate (44.1/48.0 kHz).
69 // 0x08000000: follow to system clock.
70 // 0x04000000: something relevant to clock.
71 // 0x03000000: enable output.
72 // 0x02000000: enabled irreversibly once standing unless the device voluntarily disables it.
73 // 0x01000000: enabled irreversibly once standing unless the device voluntarily disables it.
74 // 0x00ffff00: monitor input mode.
75 // 0x00000000: disabled
76 // 0x00004800: analog-1/2
77 // 0x00005a00: analog-3/4
78 // 0x00006c00: analog-5/6
79 // 0x00007e00: analog-7/8
80 // 0x00104800: AES/EBU-1/2
81 // 0x00004000: analog-1
82 // 0x00004900: analog-2
83 // 0x00005200: analog-3
84 // 0x00005b00: analog-4
85 // 0x00006400: analog-5
86 // 0x00006d00: analog-6
87 // 0x00007600: analog-7
88 // 0x00007f00: analog-8
89 // 0x00104000: AES/EBU-1
90 // 0x00104900: AES/EBU-2
91 // 0x00000060: sample rate conversion for AES/EBU input/output.
92 // 0x00000000: None
93 // 0x00000020: input signal is converted to system rate
94 // 0x00000040: output is slave to input, ignoring system rate
95 // 0x00000060: output is double rate than system rate
96 // 0x00000018: nominal rate of sampling clock.
97 // 0x00000000: 44.1 kHz
98 // 0x00000008: 48.0 kHz
99 // 0x00000010: 88.2 kHz
100 // 0x00000018: 96.0 kHz
101 // 0x00000007: source of sampling clock.
102 // 0x00000000: internal
103 // 0x00000001: ADAT on optical interface
104 // 0x00000002: AES/EBU on XLR
105 // 0x00000003: source packet header (SPH)
106 // 0x00000004: word clock on BNC
107 // 0x00000005: ADAT on Dsub 9pin
108
109 #define CLK_896_STATUS_OFFSET 0x0b14
110 #define CLK_896_STATUS_FLAG_FETCH_ENABLE 0x20000000
111 #define CLK_896_STATUS_FLAG_OUTPUT_ON 0x03000000
112 #define CLK_896_STATUS_MASK_SRC 0x00000007
113 #define CLK_896_STATUS_FLAG_SRC_INTERNAL 0x00000000
114 #define CLK_896_STATUS_FLAG_SRC_ADAT_ON_OPT 0x00000001
115 #define CLK_896_STATUS_FLAG_SRC_AESEBU 0x00000002
116 #define CLK_896_STATUS_FLAG_SRC_SPH 0x00000003
117 #define CLK_896_STATUS_FLAG_SRC_WORD 0x00000004
118 #define CLK_896_STATUS_FLAG_SRC_ADAT_ON_DSUB 0x00000005
119 #define CLK_896_STATUS_MASK_RATE 0x00000018
120 #define CLK_896_STATUS_FLAG_RATE_44100 0x00000000
121 #define CLK_896_STATUS_FLAG_RATE_48000 0x00000008
122 #define CLK_896_STATUS_FLAG_RATE_88200 0x00000010
123 #define CLK_896_STATUS_FLAG_RATE_96000 0x00000018
124
125 static void parse_clock_rate_828(u32 data, unsigned int *rate)
126 {
127 if (data & CLK_828_STATUS_FLAG_RATE_48000)
128 *rate = 48000;
129 else
130 *rate = 44100;
131 }
132
133 static int get_clock_rate_828(struct snd_motu *motu, unsigned int *rate)
134 {
135 __be32 reg;
136 int err;
137
138 err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, ®, sizeof(reg));
139 if (err < 0)
140 return err;
141 parse_clock_rate_828(be32_to_cpu(reg), rate);
142
143 return 0;
144 }
145
146 static int parse_clock_rate_896(u32 data, unsigned int *rate)
147 {
148 switch (data & CLK_896_STATUS_MASK_RATE) {
149 case CLK_896_STATUS_FLAG_RATE_44100:
150 *rate = 44100;
151 break;
152 case CLK_896_STATUS_FLAG_RATE_48000:
153 *rate = 48000;
154 break;
155 case CLK_896_STATUS_FLAG_RATE_88200:
156 *rate = 88200;
157 break;
158 case CLK_896_STATUS_FLAG_RATE_96000:
159 *rate = 96000;
160 break;
161 default:
162 return -ENXIO;
163 }
164
165 return 0;
166 }
167
168 static int get_clock_rate_896(struct snd_motu *motu, unsigned int *rate)
169 {
170 __be32 reg;
171 int err;
172
173 err = snd_motu_transaction_read(motu, CLK_896_STATUS_OFFSET, ®, sizeof(reg));
174 if (err < 0)
175 return err;
176 return parse_clock_rate_896(be32_to_cpu(reg), rate);
177 }
178
179 int snd_motu_protocol_v1_get_clock_rate(struct snd_motu *motu, unsigned int *rate)
180 {
181 if (motu->spec == &snd_motu_spec_828)
182 return get_clock_rate_828(motu, rate);
183 else if (motu->spec == &snd_motu_spec_896)
184 return get_clock_rate_896(motu, rate);
185 else
186 return -ENXIO;
187 }
188
189 static int set_clock_rate_828(struct snd_motu *motu, unsigned int rate)
190 {
191 __be32 reg;
192 u32 data;
193 int err;
194
195 err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, ®, sizeof(reg));
196 if (err < 0)
197 return err;
198 data = be32_to_cpu(reg) & CLK_828_STATUS_MASK;
199
200 data &= ~CLK_828_STATUS_FLAG_RATE_48000;
201 if (rate == 48000)
202 data |= CLK_828_STATUS_FLAG_RATE_48000;
203
204 reg = cpu_to_be32(data);
205 return snd_motu_transaction_write(motu, CLK_828_STATUS_OFFSET, ®, sizeof(reg));
206 }
207
208 static int set_clock_rate_896(struct snd_motu *motu, unsigned int rate)
209 {
210 unsigned int flag;
211 __be32 reg;
212 u32 data;
213 int err;
214
215 err = snd_motu_transaction_read(motu, CLK_896_STATUS_OFFSET, ®, sizeof(reg));
216 if (err < 0)
217 return err;
218 data = be32_to_cpu(reg);
219
220 switch (rate) {
221 case 44100:
222 flag = CLK_896_STATUS_FLAG_RATE_44100;
223 break;
224 case 48000:
225 flag = CLK_896_STATUS_FLAG_RATE_48000;
226 break;
227 case 88200:
228 flag = CLK_896_STATUS_FLAG_RATE_88200;
229 break;
230 case 96000:
231 flag = CLK_896_STATUS_FLAG_RATE_96000;
232 break;
233 default:
234 return -EINVAL;
235 }
236
237 data &= ~CLK_896_STATUS_MASK_RATE;
238 data |= flag;
239
240 reg = cpu_to_be32(data);
241 return snd_motu_transaction_write(motu, CLK_896_STATUS_OFFSET, ®, sizeof(reg));
242 }
243
244 int snd_motu_protocol_v1_set_clock_rate(struct snd_motu *motu, unsigned int rate)
245 {
246 if (motu->spec == &snd_motu_spec_828)
247 return set_clock_rate_828(motu, rate);
248 else if (motu->spec == &snd_motu_spec_896)
249 return set_clock_rate_896(motu, rate);
250 else
251 return -ENXIO;
252 }
253
254 static int get_clock_source_828(struct snd_motu *motu, enum snd_motu_clock_source *src)
255 {
256 __be32 reg;
257 u32 data;
258 int err;
259
260 err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, ®, sizeof(reg));
261 if (err < 0)
262 return err;
263 data = be32_to_cpu(reg) & CLK_828_STATUS_MASK;
264
265 switch (data & CLK_828_STATUS_MASK_SRC) {
266 case CLK_828_STATUS_FLAG_SRC_ADAT_ON_OPT:
267 *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_OPT;
268 break;
269 case CLK_828_STATUS_FLAG_SRC_SPH:
270 *src = SND_MOTU_CLOCK_SOURCE_SPH;
271 break;
272 case CLK_828_STATUS_FLAG_SRC_SPDIF:
273 {
274 if (data & CLK_828_STATUS_FLAG_OPT_IN_IFACE_IS_SPDIF)
275 *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX;
276 else
277 *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_OPT;
278 break;
279 }
280 case CLK_828_STATUS_FLAG_SRC_ADAT_ON_DSUB:
281 *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_DSUB;
282 break;
283 case CLK_828_STATUS_FLAG_SRC_INTERNAL:
284 *src = SND_MOTU_CLOCK_SOURCE_INTERNAL;
285 break;
286 default:
287 return -ENXIO;
288 }
289
290 return 0;
291 }
292
293 static int get_clock_source_896(struct snd_motu *motu, enum snd_motu_clock_source *src)
294 {
295 __be32 reg;
296 u32 data;
297 int err;
298
299 err = snd_motu_transaction_read(motu, CLK_896_STATUS_OFFSET, ®, sizeof(reg));
300 if (err < 0)
301 return err;
302 data = be32_to_cpu(reg);
303
304 switch (data & CLK_896_STATUS_MASK_SRC) {
305 case CLK_896_STATUS_FLAG_SRC_INTERNAL:
306 *src = SND_MOTU_CLOCK_SOURCE_INTERNAL;
307 break;
308 case CLK_896_STATUS_FLAG_SRC_ADAT_ON_OPT:
309 *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_OPT;
310 break;
311 case CLK_896_STATUS_FLAG_SRC_AESEBU:
312 *src = SND_MOTU_CLOCK_SOURCE_AESEBU_ON_XLR;
313 break;
314 case CLK_896_STATUS_FLAG_SRC_SPH:
315 *src = SND_MOTU_CLOCK_SOURCE_SPH;
316 break;
317 case CLK_896_STATUS_FLAG_SRC_WORD:
318 *src = SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC;
319 break;
320 case CLK_896_STATUS_FLAG_SRC_ADAT_ON_DSUB:
321 *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_DSUB;
322 break;
323 default:
324 return -ENXIO;
325 }
326
327 return 0;
328 }
329
330 int snd_motu_protocol_v1_get_clock_source(struct snd_motu *motu, enum snd_motu_clock_source *src)
331 {
332 if (motu->spec == &snd_motu_spec_828)
333 return get_clock_source_828(motu, src);
334 else if (motu->spec == &snd_motu_spec_896)
335 return get_clock_source_896(motu, src);
336 else
337 return -ENXIO;
338 }
339
340 static int switch_fetching_mode_828(struct snd_motu *motu, bool enable)
341 {
342 __be32 reg;
343 u32 data;
344 int err;
345
346 err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, ®, sizeof(reg));
347 if (err < 0)
348 return err;
349 data = be32_to_cpu(reg) & CLK_828_STATUS_MASK;
350
351 data &= ~(CLK_828_STATUS_FLAG_FETCH_PCM_FRAMES | CLK_828_STATUS_FLAG_ENABLE_OUTPUT);
352 if (enable) {
353 // This transaction should be initiated after the device receives batch of packets
354 // since the device voluntarily mutes outputs. As a workaround, yield processor over
355 // 100 msec.
356 msleep(100);
357 data |= CLK_828_STATUS_FLAG_FETCH_PCM_FRAMES | CLK_828_STATUS_FLAG_ENABLE_OUTPUT;
358 }
359
360 reg = cpu_to_be32(data);
361 return snd_motu_transaction_write(motu, CLK_828_STATUS_OFFSET, ®, sizeof(reg));
362 }
363
364 static int switch_fetching_mode_896(struct snd_motu *motu, bool enable)
365 {
366 __be32 reg;
367 u32 data;
368 int err;
369
370 err = snd_motu_transaction_read(motu, CLK_896_STATUS_OFFSET, ®, sizeof(reg));
371 if (err < 0)
372 return err;
373 data = be32_to_cpu(reg);
374
375 data &= ~CLK_896_STATUS_FLAG_FETCH_ENABLE;
376 if (enable)
377 data |= CLK_896_STATUS_FLAG_FETCH_ENABLE | CLK_896_STATUS_FLAG_OUTPUT_ON;
378
379 reg = cpu_to_be32(data);
380 return snd_motu_transaction_write(motu, CLK_896_STATUS_OFFSET, ®, sizeof(reg));
381 }
382
383 int snd_motu_protocol_v1_switch_fetching_mode(struct snd_motu *motu, bool enable)
384 {
385 if (motu->spec == &snd_motu_spec_828)
386 return switch_fetching_mode_828(motu, enable);
387 else if (motu->spec == &snd_motu_spec_896)
388 return switch_fetching_mode_896(motu, enable);
389 else
390 return -ENXIO;
391 }
392
393 static int detect_packet_formats_828(struct snd_motu *motu)
394 {
395 __be32 reg;
396 u32 data;
397 int err;
398
399 motu->tx_packet_formats.pcm_byte_offset = 4;
400 motu->tx_packet_formats.msg_chunks = 2;
401
402 motu->rx_packet_formats.pcm_byte_offset = 4;
403 motu->rx_packet_formats.msg_chunks = 0;
404
405 err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, ®, sizeof(reg));
406 if (err < 0)
407 return err;
408 data = be32_to_cpu(reg) & CLK_828_STATUS_MASK;
409
410 // The number of chunks is just reduced when SPDIF is activated.
411 if (!(data & CLK_828_STATUS_FLAG_OPT_IN_IFACE_IS_SPDIF))
412 motu->tx_packet_formats.pcm_chunks[0] += 8;
413
414 if (!(data & CLK_828_STATUS_FLAG_OPT_OUT_IFACE_IS_SPDIF))
415 motu->rx_packet_formats.pcm_chunks[0] += 8;
416
417 return 0;
418 }
419
420 static int detect_packet_formats_896(struct snd_motu *motu)
421 {
422 // 24bit PCM frames follow to source packet header without message chunk.
423 motu->tx_packet_formats.pcm_byte_offset = 4;
424 motu->rx_packet_formats.pcm_byte_offset = 4;
425
426 // No message chunk in data block.
427 motu->tx_packet_formats.msg_chunks = 0;
428 motu->rx_packet_formats.msg_chunks = 0;
429
430 // Always enable optical interface for ADAT signal since the device have no registers
431 // to refer to current configuration.
432 motu->tx_packet_formats.pcm_chunks[0] += 8;
433 motu->tx_packet_formats.pcm_chunks[1] += 8;
434
435 motu->rx_packet_formats.pcm_chunks[0] += 8;
436 motu->rx_packet_formats.pcm_chunks[1] += 8;
437
438 return 0;
439 }
440
441 int snd_motu_protocol_v1_cache_packet_formats(struct snd_motu *motu)
442 {
443 memcpy(motu->tx_packet_formats.pcm_chunks, motu->spec->tx_fixed_pcm_chunks,
444 sizeof(motu->tx_packet_formats.pcm_chunks));
445 memcpy(motu->rx_packet_formats.pcm_chunks, motu->spec->rx_fixed_pcm_chunks,
446 sizeof(motu->rx_packet_formats.pcm_chunks));
447
448 if (motu->spec == &snd_motu_spec_828)
449 return detect_packet_formats_828(motu);
450 else if (motu->spec == &snd_motu_spec_896)
451 return detect_packet_formats_896(motu);
452 else
453 return 0;
454 }
455
456 const struct snd_motu_spec snd_motu_spec_828 = {
457 .name = "828",
458 .protocol_version = SND_MOTU_PROTOCOL_V1,
459 .tx_fixed_pcm_chunks = {10, 0, 0},
460 .rx_fixed_pcm_chunks = {10, 0, 0},
461 };
462
463 const struct snd_motu_spec snd_motu_spec_896 = {
464 .name = "896",
465 .tx_fixed_pcm_chunks = {10, 10, 0},
466 .rx_fixed_pcm_chunks = {10, 10, 0},
467 };
468
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