Commit | Line | Data |
---|---|---|
31ef9134 CL |
1 | /* |
2 | * Audio and Music Data Transmission Protocol (IEC 61883-6) streams | |
3 | * with Common Isochronous Packet (IEC 61883-1) headers | |
4 | * | |
5 | * Copyright (c) Clemens Ladisch <clemens@ladisch.de> | |
6 | * Licensed under the terms of the GNU General Public License, version 2. | |
7 | */ | |
8 | ||
9 | #include <linux/device.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/firewire.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
7b3b0d85 | 14 | #include <linux/sched.h> |
31ef9134 | 15 | #include <sound/pcm.h> |
7b2d99fa | 16 | #include <sound/pcm_params.h> |
83d8d72d | 17 | #include <sound/rawmidi.h> |
31ef9134 CL |
18 | #include "amdtp.h" |
19 | ||
20 | #define TICKS_PER_CYCLE 3072 | |
21 | #define CYCLES_PER_SECOND 8000 | |
22 | #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) | |
23 | ||
24 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ | |
25 | ||
b445db44 TS |
26 | /* isochronous header parameters */ |
27 | #define ISO_DATA_LENGTH_SHIFT 16 | |
31ef9134 CL |
28 | #define TAG_CIP 1 |
29 | ||
b445db44 | 30 | /* common isochronous packet header parameters */ |
31ef9134 | 31 | #define CIP_EOH (1u << 31) |
b445db44 | 32 | #define CIP_EOH_MASK 0x80000000 |
31ef9134 | 33 | #define CIP_FMT_AM (0x10 << 24) |
b445db44 TS |
34 | #define CIP_FMT_MASK 0x3f000000 |
35 | #define CIP_SYT_MASK 0x0000ffff | |
36 | #define CIP_SYT_NO_INFO 0xffff | |
37 | #define CIP_FDF_MASK 0x00ff0000 | |
38 | #define CIP_FDF_SFC_SHIFT 16 | |
39 | ||
40 | /* | |
41 | * Audio and Music transfer protocol specific parameters | |
42 | * only "Clock-based rate control mode" is supported | |
43 | */ | |
44 | #define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3)) | |
2b3fc456 | 45 | #define AMDTP_FDF_NO_DATA 0xff |
b445db44 TS |
46 | #define AMDTP_DBS_MASK 0x00ff0000 |
47 | #define AMDTP_DBS_SHIFT 16 | |
48 | #define AMDTP_DBC_MASK 0x000000ff | |
31ef9134 CL |
49 | |
50 | /* TODO: make these configurable */ | |
51 | #define INTERRUPT_INTERVAL 16 | |
52 | #define QUEUE_LENGTH 48 | |
53 | ||
2b3fc456 | 54 | #define IN_PACKET_HEADER_SIZE 4 |
4b7da117 TS |
55 | #define OUT_PACKET_HEADER_SIZE 0 |
56 | ||
76fb8789 CL |
57 | static void pcm_period_tasklet(unsigned long data); |
58 | ||
31ef9134 | 59 | /** |
be4a2894 TS |
60 | * amdtp_stream_init - initialize an AMDTP stream structure |
61 | * @s: the AMDTP stream to initialize | |
31ef9134 | 62 | * @unit: the target of the stream |
3ff7e8f0 | 63 | * @dir: the direction of stream |
31ef9134 CL |
64 | * @flags: the packet transmission method to use |
65 | */ | |
be4a2894 | 66 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
3ff7e8f0 | 67 | enum amdtp_stream_direction dir, enum cip_flags flags) |
31ef9134 | 68 | { |
31ef9134 | 69 | s->unit = fw_unit_get(unit); |
3ff7e8f0 | 70 | s->direction = dir; |
31ef9134 CL |
71 | s->flags = flags; |
72 | s->context = ERR_PTR(-1); | |
73 | mutex_init(&s->mutex); | |
76fb8789 | 74 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 75 | s->packet_index = 0; |
31ef9134 | 76 | |
7b3b0d85 TS |
77 | init_waitqueue_head(&s->callback_wait); |
78 | s->callbacked = false; | |
79 | s->sync_slave = NULL; | |
80 | ||
31ef9134 CL |
81 | return 0; |
82 | } | |
be4a2894 | 83 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
84 | |
85 | /** | |
be4a2894 TS |
86 | * amdtp_stream_destroy - free stream resources |
87 | * @s: the AMDTP stream to destroy | |
31ef9134 | 88 | */ |
be4a2894 | 89 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 90 | { |
be4a2894 | 91 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
92 | mutex_destroy(&s->mutex); |
93 | fw_unit_put(s->unit); | |
94 | } | |
be4a2894 | 95 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 96 | |
c5280e99 | 97 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
98 | [CIP_SFC_32000] = 8, |
99 | [CIP_SFC_44100] = 8, | |
100 | [CIP_SFC_48000] = 8, | |
101 | [CIP_SFC_88200] = 16, | |
102 | [CIP_SFC_96000] = 16, | |
103 | [CIP_SFC_176400] = 32, | |
104 | [CIP_SFC_192000] = 32, | |
105 | }; | |
106 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
107 | ||
7b2d99fa TS |
108 | /** |
109 | * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream | |
110 | * @s: the AMDTP stream, which must be initialized. | |
111 | * @runtime: the PCM substream runtime | |
112 | */ | |
113 | int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, | |
114 | struct snd_pcm_runtime *runtime) | |
115 | { | |
116 | int err; | |
117 | ||
118 | /* AM824 in IEC 61883-6 can deliver 24bit data */ | |
119 | err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); | |
120 | if (err < 0) | |
121 | goto end; | |
122 | ||
123 | /* | |
124 | * Currently firewire-lib processes 16 packets in one software | |
125 | * interrupt callback. This equals to 2msec but actually the | |
126 | * interval of the interrupts has a jitter. | |
127 | * Additionally, even if adding a constraint to fit period size to | |
128 | * 2msec, actual calculated frames per period doesn't equal to 2msec, | |
129 | * depending on sampling rate. | |
130 | * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec. | |
131 | * Here let us use 5msec for safe period interrupt. | |
132 | */ | |
133 | err = snd_pcm_hw_constraint_minmax(runtime, | |
134 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
135 | 5000, UINT_MAX); | |
136 | if (err < 0) | |
137 | goto end; | |
138 | ||
139 | /* Non-Blocking stream has no more constraints */ | |
140 | if (!(s->flags & CIP_BLOCKING)) | |
141 | goto end; | |
142 | ||
143 | /* | |
144 | * One AMDTP packet can include some frames. In blocking mode, the | |
145 | * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, | |
146 | * depending on its sampling rate. For accurate period interrupt, it's | |
147 | * preferrable to aligh period/buffer sizes to current SYT_INTERVAL. | |
148 | * | |
149 | * TODO: These constraints can be improved with propper rules. | |
150 | * Currently apply LCM of SYT_INTEVALs. | |
151 | */ | |
152 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
153 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32); | |
154 | if (err < 0) | |
155 | goto end; | |
156 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
157 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32); | |
158 | end: | |
159 | return err; | |
160 | } | |
161 | EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); | |
162 | ||
31ef9134 | 163 | /** |
be4a2894 TS |
164 | * amdtp_stream_set_parameters - set stream parameters |
165 | * @s: the AMDTP stream to configure | |
31ef9134 | 166 | * @rate: the sample rate |
a7304e3b CL |
167 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
168 | * as AM824 multi-bit linear audio | |
169 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 170 | * |
a7304e3b | 171 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
172 | * changed while the stream is running. |
173 | */ | |
be4a2894 TS |
174 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
175 | unsigned int rate, | |
176 | unsigned int pcm_channels, | |
177 | unsigned int midi_ports) | |
31ef9134 | 178 | { |
a7304e3b CL |
179 | static const unsigned int rates[] = { |
180 | [CIP_SFC_32000] = 32000, | |
181 | [CIP_SFC_44100] = 44100, | |
182 | [CIP_SFC_48000] = 48000, | |
183 | [CIP_SFC_88200] = 88200, | |
184 | [CIP_SFC_96000] = 96000, | |
185 | [CIP_SFC_176400] = 176400, | |
186 | [CIP_SFC_192000] = 192000, | |
31ef9134 | 187 | }; |
77d2a8a4 | 188 | unsigned int i, sfc, midi_channels; |
31ef9134 | 189 | |
83d8d72d TS |
190 | midi_channels = DIV_ROUND_UP(midi_ports, 8); |
191 | ||
77d2a8a4 TS |
192 | if (WARN_ON(amdtp_stream_running(s)) | |
193 | WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) | | |
83d8d72d | 194 | WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI)) |
31ef9134 CL |
195 | return; |
196 | ||
a7304e3b CL |
197 | for (sfc = 0; sfc < CIP_SFC_COUNT; ++sfc) |
198 | if (rates[sfc] == rate) | |
e84d15f6 | 199 | goto sfc_found; |
31ef9134 | 200 | WARN_ON(1); |
e84d15f6 CL |
201 | return; |
202 | ||
203 | sfc_found: | |
10550bea | 204 | s->pcm_channels = pcm_channels; |
e84d15f6 | 205 | s->sfc = sfc; |
77d2a8a4 | 206 | s->data_block_quadlets = s->pcm_channels + midi_channels; |
a7304e3b CL |
207 | s->midi_ports = midi_ports; |
208 | ||
209 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
210 | |
211 | /* default buffering in the device */ | |
212 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
213 | if (s->flags & CIP_BLOCKING) | |
214 | /* additional buffering needed to adjust for no-data packets */ | |
215 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
77d2a8a4 TS |
216 | |
217 | /* init the position map for PCM and MIDI channels */ | |
218 | for (i = 0; i < pcm_channels; i++) | |
219 | s->pcm_positions[i] = i; | |
220 | s->midi_position = s->pcm_channels; | |
31ef9134 | 221 | } |
be4a2894 | 222 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
223 | |
224 | /** | |
be4a2894 TS |
225 | * amdtp_stream_get_max_payload - get the stream's packet size |
226 | * @s: the AMDTP stream | |
31ef9134 CL |
227 | * |
228 | * This function must not be called before the stream has been configured | |
be4a2894 | 229 | * with amdtp_stream_set_parameters(). |
31ef9134 | 230 | */ |
be4a2894 | 231 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 232 | { |
e84d15f6 | 233 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 234 | } |
be4a2894 | 235 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 236 | |
be4a2894 | 237 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
238 | struct snd_pcm_substream *pcm, |
239 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 240 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
241 | struct snd_pcm_substream *pcm, |
242 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
243 | static void amdtp_read_s32(struct amdtp_stream *s, |
244 | struct snd_pcm_substream *pcm, | |
245 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
246 | |
247 | /** | |
be4a2894 TS |
248 | * amdtp_stream_set_pcm_format - set the PCM format |
249 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
250 | * @format: the format of the ALSA PCM device |
251 | * | |
a7304e3b CL |
252 | * The sample format must be set after the other paramters (rate/PCM channels/ |
253 | * MIDI) and before the stream is started, and must not be changed while the | |
254 | * stream is running. | |
31ef9134 | 255 | */ |
be4a2894 TS |
256 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
257 | snd_pcm_format_t format) | |
31ef9134 | 258 | { |
83d8d72d | 259 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
260 | return; |
261 | ||
262 | switch (format) { | |
263 | default: | |
264 | WARN_ON(1); | |
265 | /* fall through */ | |
266 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 | 267 | if (s->direction == AMDTP_OUT_STREAM) { |
10550bea | 268 | s->transfer_samples = amdtp_write_s16; |
2b3fc456 TS |
269 | break; |
270 | } | |
271 | WARN_ON(1); | |
272 | /* fall through */ | |
31ef9134 | 273 | case SNDRV_PCM_FORMAT_S32: |
10550bea TS |
274 | if (s->direction == AMDTP_OUT_STREAM) |
275 | s->transfer_samples = amdtp_write_s32; | |
276 | else | |
277 | s->transfer_samples = amdtp_read_s32; | |
31ef9134 CL |
278 | break; |
279 | } | |
280 | } | |
be4a2894 | 281 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 282 | |
76fb8789 | 283 | /** |
be4a2894 TS |
284 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
285 | * @s: the AMDTP stream | |
76fb8789 CL |
286 | * |
287 | * This function should be called from the PCM device's .prepare callback. | |
288 | */ | |
be4a2894 | 289 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
290 | { |
291 | tasklet_kill(&s->period_tasklet); | |
292 | s->pcm_buffer_pointer = 0; | |
293 | s->pcm_period_pointer = 0; | |
92b862c7 | 294 | s->pointer_flush = true; |
76fb8789 | 295 | } |
be4a2894 | 296 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 297 | |
be4a2894 | 298 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
299 | { |
300 | unsigned int phase, data_blocks; | |
301 | ||
ccccad86 TS |
302 | if (s->flags & CIP_BLOCKING) |
303 | data_blocks = s->syt_interval; | |
304 | else if (!cip_sfc_is_base_44100(s->sfc)) { | |
31ef9134 CL |
305 | /* Sample_rate / 8000 is an integer, and precomputed. */ |
306 | data_blocks = s->data_block_state; | |
307 | } else { | |
308 | phase = s->data_block_state; | |
309 | ||
310 | /* | |
311 | * This calculates the number of data blocks per packet so that | |
312 | * 1) the overall rate is correct and exactly synchronized to | |
313 | * the bus clock, and | |
314 | * 2) packets with a rounded-up number of blocks occur as early | |
315 | * as possible in the sequence (to prevent underruns of the | |
316 | * device's buffer). | |
317 | */ | |
318 | if (s->sfc == CIP_SFC_44100) | |
319 | /* 6 6 5 6 5 6 5 ... */ | |
320 | data_blocks = 5 + ((phase & 1) ^ | |
321 | (phase == 0 || phase >= 40)); | |
322 | else | |
323 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
324 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
325 | if (++phase >= (80 >> (s->sfc >> 1))) | |
326 | phase = 0; | |
327 | s->data_block_state = phase; | |
328 | } | |
329 | ||
330 | return data_blocks; | |
331 | } | |
332 | ||
be4a2894 | 333 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
334 | unsigned int cycle) |
335 | { | |
336 | unsigned int syt_offset, phase, index, syt; | |
337 | ||
338 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
339 | if (!cip_sfc_is_base_44100(s->sfc)) | |
340 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
341 | else { | |
342 | /* | |
343 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
344 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
345 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
346 | * elements is about 1386.23. Rounding the results of this | |
347 | * formula to the SYT precision results in a sequence of | |
348 | * differences that begins with: | |
349 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
350 | * This code generates _exactly_ the same sequence. | |
351 | */ | |
352 | phase = s->syt_offset_state; | |
353 | index = phase % 13; | |
354 | syt_offset = s->last_syt_offset; | |
355 | syt_offset += 1386 + ((index && !(index & 3)) || | |
356 | phase == 146); | |
357 | if (++phase >= 147) | |
358 | phase = 0; | |
359 | s->syt_offset_state = phase; | |
360 | } | |
361 | } else | |
362 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
363 | s->last_syt_offset = syt_offset; | |
364 | ||
be454366 | 365 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 366 | syt_offset += s->transfer_delay; |
be454366 CL |
367 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
368 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 369 | |
b445db44 | 370 | return syt & CIP_SYT_MASK; |
be454366 | 371 | } else { |
b445db44 | 372 | return CIP_SYT_NO_INFO; |
be454366 | 373 | } |
31ef9134 CL |
374 | } |
375 | ||
be4a2894 | 376 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
377 | struct snd_pcm_substream *pcm, |
378 | __be32 *buffer, unsigned int frames) | |
379 | { | |
380 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 381 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
382 | const u32 *src; |
383 | ||
384 | channels = s->pcm_channels; | |
385 | src = (void *)runtime->dma_area + | |
e84841f9 | 386 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 387 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
388 | |
389 | for (i = 0; i < frames; ++i) { | |
390 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
391 | buffer[s->pcm_positions[c]] = |
392 | cpu_to_be32((*src >> 8) | 0x40000000); | |
31ef9134 | 393 | src++; |
31ef9134 | 394 | } |
77d2a8a4 | 395 | buffer += s->data_block_quadlets; |
31ef9134 CL |
396 | if (--remaining_frames == 0) |
397 | src = (void *)runtime->dma_area; | |
398 | } | |
399 | } | |
400 | ||
be4a2894 | 401 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
402 | struct snd_pcm_substream *pcm, |
403 | __be32 *buffer, unsigned int frames) | |
404 | { | |
405 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 406 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
407 | const u16 *src; |
408 | ||
409 | channels = s->pcm_channels; | |
410 | src = (void *)runtime->dma_area + | |
e84841f9 | 411 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 412 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
413 | |
414 | for (i = 0; i < frames; ++i) { | |
415 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
416 | buffer[s->pcm_positions[c]] = |
417 | cpu_to_be32((*src << 8) | 0x40000000); | |
31ef9134 | 418 | src++; |
31ef9134 | 419 | } |
77d2a8a4 | 420 | buffer += s->data_block_quadlets; |
31ef9134 CL |
421 | if (--remaining_frames == 0) |
422 | src = (void *)runtime->dma_area; | |
423 | } | |
424 | } | |
425 | ||
2b3fc456 TS |
426 | static void amdtp_read_s32(struct amdtp_stream *s, |
427 | struct snd_pcm_substream *pcm, | |
428 | __be32 *buffer, unsigned int frames) | |
429 | { | |
430 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
431 | unsigned int channels, remaining_frames, i, c; | |
432 | u32 *dst; | |
433 | ||
434 | channels = s->pcm_channels; | |
435 | dst = (void *)runtime->dma_area + | |
436 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
437 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
438 | ||
439 | for (i = 0; i < frames; ++i) { | |
440 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 441 | *dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8; |
2b3fc456 TS |
442 | dst++; |
443 | } | |
444 | buffer += s->data_block_quadlets; | |
445 | if (--remaining_frames == 0) | |
446 | dst = (void *)runtime->dma_area; | |
447 | } | |
448 | } | |
449 | ||
be4a2894 | 450 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
451 | __be32 *buffer, unsigned int frames) |
452 | { | |
453 | unsigned int i, c; | |
454 | ||
455 | for (i = 0; i < frames; ++i) { | |
456 | for (c = 0; c < s->pcm_channels; ++c) | |
77d2a8a4 | 457 | buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000); |
31ef9134 CL |
458 | buffer += s->data_block_quadlets; |
459 | } | |
460 | } | |
461 | ||
be4a2894 | 462 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
463 | __be32 *buffer, unsigned int frames) |
464 | { | |
83d8d72d TS |
465 | unsigned int f, port; |
466 | u8 *b; | |
467 | ||
468 | for (f = 0; f < frames; f++) { | |
77d2a8a4 TS |
469 | buffer[s->midi_position] = 0; |
470 | b = (u8 *)&buffer[s->midi_position]; | |
83d8d72d TS |
471 | |
472 | port = (s->data_block_counter + f) % 8; | |
473 | if ((s->midi[port] == NULL) || | |
474 | (snd_rawmidi_transmit(s->midi[port], b + 1, 1) <= 0)) | |
475 | b[0] = 0x80; | |
476 | else | |
477 | b[0] = 0x81; | |
478 | ||
479 | buffer += s->data_block_quadlets; | |
480 | } | |
481 | } | |
482 | ||
483 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
484 | __be32 *buffer, unsigned int frames) | |
485 | { | |
486 | unsigned int f, port; | |
487 | int len; | |
488 | u8 *b; | |
489 | ||
490 | for (f = 0; f < frames; f++) { | |
491 | port = (s->data_block_counter + f) % 8; | |
77d2a8a4 | 492 | b = (u8 *)&buffer[s->midi_position]; |
31ef9134 | 493 | |
83d8d72d TS |
494 | len = b[0] - 0x80; |
495 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
496 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
497 | ||
498 | buffer += s->data_block_quadlets; | |
499 | } | |
31ef9134 CL |
500 | } |
501 | ||
4b7da117 TS |
502 | static void update_pcm_pointers(struct amdtp_stream *s, |
503 | struct snd_pcm_substream *pcm, | |
504 | unsigned int frames) | |
505 | { unsigned int ptr; | |
506 | ||
4b7da117 TS |
507 | ptr = s->pcm_buffer_pointer + frames; |
508 | if (ptr >= pcm->runtime->buffer_size) | |
509 | ptr -= pcm->runtime->buffer_size; | |
510 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
511 | ||
512 | s->pcm_period_pointer += frames; | |
513 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
514 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
515 | s->pointer_flush = false; | |
516 | tasklet_hi_schedule(&s->period_tasklet); | |
517 | } | |
518 | } | |
519 | ||
520 | static void pcm_period_tasklet(unsigned long data) | |
521 | { | |
522 | struct amdtp_stream *s = (void *)data; | |
523 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
524 | ||
525 | if (pcm) | |
526 | snd_pcm_period_elapsed(pcm); | |
527 | } | |
528 | ||
529 | static int queue_packet(struct amdtp_stream *s, | |
530 | unsigned int header_length, | |
531 | unsigned int payload_length, bool skip) | |
532 | { | |
533 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
534 | int err = 0; |
535 | ||
536 | if (IS_ERR(s->context)) | |
537 | goto end; | |
4b7da117 TS |
538 | |
539 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
540 | p.tag = TAG_CIP; | |
541 | p.header_length = header_length; | |
542 | p.payload_length = (!skip) ? payload_length : 0; | |
543 | p.skip = skip; | |
544 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
545 | s->buffer.packets[s->packet_index].offset); | |
546 | if (err < 0) { | |
547 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
548 | goto end; | |
549 | } | |
550 | ||
551 | if (++s->packet_index >= QUEUE_LENGTH) | |
552 | s->packet_index = 0; | |
553 | end: | |
554 | return err; | |
555 | } | |
556 | ||
557 | static inline int queue_out_packet(struct amdtp_stream *s, | |
558 | unsigned int payload_length, bool skip) | |
559 | { | |
560 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
561 | payload_length, skip); | |
562 | } | |
563 | ||
2b3fc456 TS |
564 | static inline int queue_in_packet(struct amdtp_stream *s) |
565 | { | |
566 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
567 | amdtp_stream_get_max_payload(s), false); | |
568 | } | |
569 | ||
ccccad86 | 570 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
571 | { |
572 | __be32 *buffer; | |
ccccad86 | 573 | unsigned int data_blocks, payload_length; |
31ef9134 | 574 | struct snd_pcm_substream *pcm; |
31ef9134 | 575 | |
ec00f5e4 CL |
576 | if (s->packet_index < 0) |
577 | return; | |
ec00f5e4 | 578 | |
82755abf | 579 | /* this module generate empty packet for 'no data' */ |
ccccad86 | 580 | if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO)) |
e84d15f6 | 581 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
582 | else |
583 | data_blocks = 0; | |
31ef9134 | 584 | |
ccccad86 | 585 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 586 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 587 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
588 | s->data_block_counter); |
589 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 590 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
591 | buffer += 2; |
592 | ||
593 | pcm = ACCESS_ONCE(s->pcm); | |
594 | if (pcm) | |
595 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
596 | else | |
597 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
598 | if (s->midi_ports) | |
599 | amdtp_fill_midi(s, buffer, data_blocks); | |
600 | ||
601 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
602 | ||
4b7da117 TS |
603 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
604 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 605 | s->packet_index = -1; |
be4a2894 | 606 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
607 | return; |
608 | } | |
31ef9134 | 609 | |
76fb8789 | 610 | if (pcm) |
4b7da117 | 611 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
612 | } |
613 | ||
2b3fc456 TS |
614 | static void handle_in_packet(struct amdtp_stream *s, |
615 | unsigned int payload_quadlets, | |
616 | __be32 *buffer) | |
617 | { | |
618 | u32 cip_header[2]; | |
619 | unsigned int data_blocks, data_block_quadlets, data_block_counter; | |
620 | struct snd_pcm_substream *pcm = NULL; | |
621 | ||
622 | cip_header[0] = be32_to_cpu(buffer[0]); | |
623 | cip_header[1] = be32_to_cpu(buffer[1]); | |
624 | ||
625 | /* | |
626 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 627 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 TS |
628 | */ |
629 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
630 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
631 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
632 | dev_info_ratelimited(&s->unit->device, | |
633 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
634 | cip_header[0], cip_header[1]); | |
635 | goto end; | |
636 | } | |
637 | ||
638 | /* Calculate data blocks */ | |
639 | if (payload_quadlets < 3 || | |
640 | ((cip_header[1] & CIP_FDF_MASK) == | |
641 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
642 | data_blocks = 0; | |
643 | } else { | |
644 | data_block_quadlets = | |
645 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
646 | /* avoid division by zero */ | |
647 | if (data_block_quadlets == 0) { | |
648 | dev_info_ratelimited(&s->unit->device, | |
649 | "Detect invalid value in dbs field: %08X\n", | |
650 | cip_header[0]); | |
651 | goto err; | |
652 | } | |
653 | ||
654 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
655 | } | |
656 | ||
657 | /* Check data block counter continuity */ | |
658 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
659 | if (data_block_counter != s->data_block_counter) { | |
660 | dev_info(&s->unit->device, | |
661 | "Detect discontinuity of CIP: %02X %02X\n", | |
662 | s->data_block_counter, data_block_counter); | |
663 | goto err; | |
664 | } | |
665 | ||
666 | if (data_blocks > 0) { | |
667 | buffer += 2; | |
668 | ||
669 | pcm = ACCESS_ONCE(s->pcm); | |
670 | if (pcm) | |
671 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
672 | |
673 | if (s->midi_ports) | |
674 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
675 | } |
676 | ||
677 | s->data_block_counter = (data_block_counter + data_blocks) & 0xff; | |
678 | end: | |
679 | if (queue_in_packet(s) < 0) | |
680 | goto err; | |
681 | ||
682 | if (pcm) | |
683 | update_pcm_pointers(s, pcm, data_blocks); | |
684 | ||
685 | return; | |
686 | err: | |
687 | s->packet_index = -1; | |
688 | amdtp_stream_pcm_abort(s); | |
689 | } | |
690 | ||
4b7da117 TS |
691 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
692 | size_t header_length, void *header, | |
693 | void *private_data) | |
31ef9134 | 694 | { |
be4a2894 | 695 | struct amdtp_stream *s = private_data; |
ccccad86 | 696 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
697 | |
698 | /* | |
699 | * Compute the cycle of the last queued packet. | |
700 | * (We need only the four lowest bits for the SYT, so we can ignore | |
701 | * that bits 0-11 must wrap around at 3072.) | |
702 | */ | |
703 | cycle += QUEUE_LENGTH - packets; | |
704 | ||
ccccad86 TS |
705 | for (i = 0; i < packets; ++i) { |
706 | syt = calculate_syt(s, ++cycle); | |
707 | handle_out_packet(s, syt); | |
708 | } | |
13882a82 | 709 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
710 | } |
711 | ||
2b3fc456 TS |
712 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
713 | size_t header_length, void *header, | |
714 | void *private_data) | |
715 | { | |
716 | struct amdtp_stream *s = private_data; | |
7b3b0d85 | 717 | unsigned int p, syt, packets, payload_quadlets; |
2b3fc456 TS |
718 | __be32 *buffer, *headers = header; |
719 | ||
720 | /* The number of packets in buffer */ | |
721 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
722 | ||
723 | for (p = 0; p < packets; p++) { | |
724 | if (s->packet_index < 0) | |
7b3b0d85 TS |
725 | break; |
726 | ||
2b3fc456 TS |
727 | buffer = s->buffer.packets[s->packet_index].buffer; |
728 | ||
7b3b0d85 TS |
729 | /* Process sync slave stream */ |
730 | if (s->sync_slave && s->sync_slave->callbacked) { | |
731 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
732 | handle_out_packet(s->sync_slave, syt); | |
733 | } | |
734 | ||
2b3fc456 TS |
735 | /* The number of quadlets in this packet */ |
736 | payload_quadlets = | |
737 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
738 | handle_in_packet(s, payload_quadlets, buffer); | |
739 | } | |
740 | ||
7b3b0d85 TS |
741 | /* Queueing error or detecting discontinuity */ |
742 | if (s->packet_index < 0) { | |
743 | /* Abort sync slave. */ | |
744 | if (s->sync_slave) { | |
745 | s->sync_slave->packet_index = -1; | |
746 | amdtp_stream_pcm_abort(s->sync_slave); | |
747 | } | |
748 | return; | |
749 | } | |
750 | ||
751 | /* when sync to device, flush the packets for slave stream */ | |
752 | if (s->sync_slave && s->sync_slave->callbacked) | |
753 | fw_iso_context_queue_flush(s->sync_slave->context); | |
754 | ||
2b3fc456 TS |
755 | fw_iso_context_queue_flush(s->context); |
756 | } | |
757 | ||
7b3b0d85 TS |
758 | /* processing is done by master callback */ |
759 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
760 | size_t header_length, void *header, | |
761 | void *private_data) | |
762 | { | |
763 | return; | |
764 | } | |
765 | ||
766 | /* this is executed one time */ | |
767 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
768 | u32 cycle, size_t header_length, | |
769 | void *header, void *private_data) | |
770 | { | |
771 | struct amdtp_stream *s = private_data; | |
772 | ||
773 | /* | |
774 | * For in-stream, first packet has come. | |
775 | * For out-stream, prepared to transmit first packet | |
776 | */ | |
777 | s->callbacked = true; | |
778 | wake_up(&s->callback_wait); | |
779 | ||
780 | if (s->direction == AMDTP_IN_STREAM) | |
781 | context->callback.sc = in_stream_callback; | |
782 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
783 | context->callback.sc = slave_stream_callback; | |
784 | else | |
785 | context->callback.sc = out_stream_callback; | |
786 | ||
787 | context->callback.sc(context, cycle, header_length, header, s); | |
788 | } | |
789 | ||
31ef9134 | 790 | /** |
be4a2894 TS |
791 | * amdtp_stream_start - start transferring packets |
792 | * @s: the AMDTP stream to start | |
31ef9134 CL |
793 | * @channel: the isochronous channel on the bus |
794 | * @speed: firewire speed code | |
795 | * | |
796 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
797 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
798 | * device can be started. | |
31ef9134 | 799 | */ |
be4a2894 | 800 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
801 | { |
802 | static const struct { | |
803 | unsigned int data_block; | |
804 | unsigned int syt_offset; | |
805 | } initial_state[] = { | |
806 | [CIP_SFC_32000] = { 4, 3072 }, | |
807 | [CIP_SFC_48000] = { 6, 1024 }, | |
808 | [CIP_SFC_96000] = { 12, 1024 }, | |
809 | [CIP_SFC_192000] = { 24, 1024 }, | |
810 | [CIP_SFC_44100] = { 0, 67 }, | |
811 | [CIP_SFC_88200] = { 0, 67 }, | |
812 | [CIP_SFC_176400] = { 0, 67 }, | |
813 | }; | |
2b3fc456 TS |
814 | unsigned int header_size; |
815 | enum dma_data_direction dir; | |
2b3fc456 | 816 | int type, err; |
31ef9134 CL |
817 | |
818 | mutex_lock(&s->mutex); | |
819 | ||
be4a2894 | 820 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 821 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
822 | err = -EBADFD; |
823 | goto err_unlock; | |
824 | } | |
825 | ||
4b7da117 | 826 | s->data_block_counter = 0; |
31ef9134 CL |
827 | s->data_block_state = initial_state[s->sfc].data_block; |
828 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
829 | s->last_syt_offset = TICKS_PER_CYCLE; | |
830 | ||
2b3fc456 TS |
831 | /* initialize packet buffer */ |
832 | if (s->direction == AMDTP_IN_STREAM) { | |
833 | dir = DMA_FROM_DEVICE; | |
834 | type = FW_ISO_CONTEXT_RECEIVE; | |
835 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
836 | } else { |
837 | dir = DMA_TO_DEVICE; | |
838 | type = FW_ISO_CONTEXT_TRANSMIT; | |
839 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 840 | } |
31ef9134 | 841 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 842 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
843 | if (err < 0) |
844 | goto err_unlock; | |
845 | ||
846 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 847 | type, channel, speed, header_size, |
7b3b0d85 | 848 | amdtp_stream_first_callback, s); |
31ef9134 CL |
849 | if (IS_ERR(s->context)) { |
850 | err = PTR_ERR(s->context); | |
851 | if (err == -EBUSY) | |
852 | dev_err(&s->unit->device, | |
be4a2894 | 853 | "no free stream on this controller\n"); |
31ef9134 CL |
854 | goto err_buffer; |
855 | } | |
856 | ||
be4a2894 | 857 | amdtp_stream_update(s); |
31ef9134 | 858 | |
ec00f5e4 | 859 | s->packet_index = 0; |
4b7da117 | 860 | do { |
2b3fc456 TS |
861 | if (s->direction == AMDTP_IN_STREAM) |
862 | err = queue_in_packet(s); | |
863 | else | |
864 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
865 | if (err < 0) |
866 | goto err_context; | |
867 | } while (s->packet_index > 0); | |
31ef9134 | 868 | |
2b3fc456 | 869 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7b3b0d85 | 870 | s->callbacked = false; |
2b3fc456 TS |
871 | err = fw_iso_context_start(s->context, -1, 0, |
872 | FW_ISO_CONTEXT_MATCH_TAG1); | |
31ef9134 CL |
873 | if (err < 0) |
874 | goto err_context; | |
875 | ||
876 | mutex_unlock(&s->mutex); | |
877 | ||
878 | return 0; | |
879 | ||
880 | err_context: | |
881 | fw_iso_context_destroy(s->context); | |
882 | s->context = ERR_PTR(-1); | |
883 | err_buffer: | |
884 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
885 | err_unlock: | |
886 | mutex_unlock(&s->mutex); | |
887 | ||
888 | return err; | |
889 | } | |
be4a2894 | 890 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 891 | |
e9148ddd | 892 | /** |
be4a2894 TS |
893 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
894 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
895 | * |
896 | * Returns the current buffer position, in frames. | |
897 | */ | |
be4a2894 | 898 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 899 | { |
92b862c7 CL |
900 | /* this optimization is allowed to be racy */ |
901 | if (s->pointer_flush) | |
902 | fw_iso_context_flush_completions(s->context); | |
903 | else | |
904 | s->pointer_flush = true; | |
e9148ddd CL |
905 | |
906 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
907 | } | |
be4a2894 | 908 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 909 | |
31ef9134 | 910 | /** |
be4a2894 TS |
911 | * amdtp_stream_update - update the stream after a bus reset |
912 | * @s: the AMDTP stream | |
31ef9134 | 913 | */ |
be4a2894 | 914 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
915 | { |
916 | ACCESS_ONCE(s->source_node_id_field) = | |
917 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
918 | } | |
be4a2894 | 919 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
920 | |
921 | /** | |
be4a2894 TS |
922 | * amdtp_stream_stop - stop sending packets |
923 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
924 | * |
925 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
926 | * itself can be stopped. | |
927 | */ | |
be4a2894 | 928 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
929 | { |
930 | mutex_lock(&s->mutex); | |
931 | ||
be4a2894 | 932 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
933 | mutex_unlock(&s->mutex); |
934 | return; | |
935 | } | |
936 | ||
76fb8789 | 937 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
938 | fw_iso_context_stop(s->context); |
939 | fw_iso_context_destroy(s->context); | |
940 | s->context = ERR_PTR(-1); | |
941 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
942 | ||
7b3b0d85 TS |
943 | s->callbacked = false; |
944 | ||
31ef9134 CL |
945 | mutex_unlock(&s->mutex); |
946 | } | |
be4a2894 | 947 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
948 | |
949 | /** | |
be4a2894 | 950 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
951 | * @s: the AMDTP stream about to be stopped |
952 | * | |
953 | * If the isochronous stream needs to be stopped asynchronously, call this | |
954 | * function first to stop the PCM device. | |
955 | */ | |
be4a2894 | 956 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
957 | { |
958 | struct snd_pcm_substream *pcm; | |
959 | ||
960 | pcm = ACCESS_ONCE(s->pcm); | |
961 | if (pcm) { | |
962 | snd_pcm_stream_lock_irq(pcm); | |
963 | if (snd_pcm_running(pcm)) | |
964 | snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); | |
965 | snd_pcm_stream_unlock_irq(pcm); | |
966 | } | |
967 | } | |
be4a2894 | 968 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |