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 | ||
53111cdc TS |
81 | s->rx_blocks_for_midi = UINT_MAX; |
82 | ||
31ef9134 CL |
83 | return 0; |
84 | } | |
be4a2894 | 85 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
86 | |
87 | /** | |
be4a2894 TS |
88 | * amdtp_stream_destroy - free stream resources |
89 | * @s: the AMDTP stream to destroy | |
31ef9134 | 90 | */ |
be4a2894 | 91 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 92 | { |
be4a2894 | 93 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
94 | mutex_destroy(&s->mutex); |
95 | fw_unit_put(s->unit); | |
96 | } | |
be4a2894 | 97 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 98 | |
c5280e99 | 99 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
100 | [CIP_SFC_32000] = 8, |
101 | [CIP_SFC_44100] = 8, | |
102 | [CIP_SFC_48000] = 8, | |
103 | [CIP_SFC_88200] = 16, | |
104 | [CIP_SFC_96000] = 16, | |
105 | [CIP_SFC_176400] = 32, | |
106 | [CIP_SFC_192000] = 32, | |
107 | }; | |
108 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
109 | ||
f9503a68 | 110 | const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = { |
1017abed TS |
111 | [CIP_SFC_32000] = 32000, |
112 | [CIP_SFC_44100] = 44100, | |
113 | [CIP_SFC_48000] = 48000, | |
114 | [CIP_SFC_88200] = 88200, | |
115 | [CIP_SFC_96000] = 96000, | |
116 | [CIP_SFC_176400] = 176400, | |
117 | [CIP_SFC_192000] = 192000, | |
118 | }; | |
119 | EXPORT_SYMBOL(amdtp_rate_table); | |
120 | ||
7b2d99fa TS |
121 | /** |
122 | * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream | |
123 | * @s: the AMDTP stream, which must be initialized. | |
124 | * @runtime: the PCM substream runtime | |
125 | */ | |
126 | int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, | |
127 | struct snd_pcm_runtime *runtime) | |
128 | { | |
129 | int err; | |
130 | ||
131 | /* AM824 in IEC 61883-6 can deliver 24bit data */ | |
132 | err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); | |
133 | if (err < 0) | |
134 | goto end; | |
135 | ||
136 | /* | |
137 | * Currently firewire-lib processes 16 packets in one software | |
138 | * interrupt callback. This equals to 2msec but actually the | |
139 | * interval of the interrupts has a jitter. | |
140 | * Additionally, even if adding a constraint to fit period size to | |
141 | * 2msec, actual calculated frames per period doesn't equal to 2msec, | |
142 | * depending on sampling rate. | |
143 | * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec. | |
144 | * Here let us use 5msec for safe period interrupt. | |
145 | */ | |
146 | err = snd_pcm_hw_constraint_minmax(runtime, | |
147 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
148 | 5000, UINT_MAX); | |
149 | if (err < 0) | |
150 | goto end; | |
151 | ||
152 | /* Non-Blocking stream has no more constraints */ | |
153 | if (!(s->flags & CIP_BLOCKING)) | |
154 | goto end; | |
155 | ||
156 | /* | |
157 | * One AMDTP packet can include some frames. In blocking mode, the | |
158 | * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, | |
159 | * depending on its sampling rate. For accurate period interrupt, it's | |
160 | * preferrable to aligh period/buffer sizes to current SYT_INTERVAL. | |
161 | * | |
162 | * TODO: These constraints can be improved with propper rules. | |
163 | * Currently apply LCM of SYT_INTEVALs. | |
164 | */ | |
165 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
166 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32); | |
167 | if (err < 0) | |
168 | goto end; | |
169 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
170 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32); | |
171 | end: | |
172 | return err; | |
173 | } | |
174 | EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); | |
175 | ||
31ef9134 | 176 | /** |
be4a2894 TS |
177 | * amdtp_stream_set_parameters - set stream parameters |
178 | * @s: the AMDTP stream to configure | |
31ef9134 | 179 | * @rate: the sample rate |
a7304e3b CL |
180 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
181 | * as AM824 multi-bit linear audio | |
182 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 183 | * |
a7304e3b | 184 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
185 | * changed while the stream is running. |
186 | */ | |
be4a2894 TS |
187 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
188 | unsigned int rate, | |
189 | unsigned int pcm_channels, | |
190 | unsigned int midi_ports) | |
31ef9134 | 191 | { |
77d2a8a4 | 192 | unsigned int i, sfc, midi_channels; |
31ef9134 | 193 | |
83d8d72d TS |
194 | midi_channels = DIV_ROUND_UP(midi_ports, 8); |
195 | ||
77d2a8a4 TS |
196 | if (WARN_ON(amdtp_stream_running(s)) | |
197 | WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) | | |
83d8d72d | 198 | WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI)) |
31ef9134 CL |
199 | return; |
200 | ||
f9503a68 | 201 | for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) |
1017abed | 202 | if (amdtp_rate_table[sfc] == rate) |
e84d15f6 | 203 | goto sfc_found; |
31ef9134 | 204 | WARN_ON(1); |
e84d15f6 CL |
205 | return; |
206 | ||
207 | sfc_found: | |
10550bea | 208 | s->pcm_channels = pcm_channels; |
e84d15f6 | 209 | s->sfc = sfc; |
77d2a8a4 | 210 | s->data_block_quadlets = s->pcm_channels + midi_channels; |
a7304e3b CL |
211 | s->midi_ports = midi_ports; |
212 | ||
213 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
214 | |
215 | /* default buffering in the device */ | |
216 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
217 | if (s->flags & CIP_BLOCKING) | |
218 | /* additional buffering needed to adjust for no-data packets */ | |
219 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
77d2a8a4 TS |
220 | |
221 | /* init the position map for PCM and MIDI channels */ | |
222 | for (i = 0; i < pcm_channels; i++) | |
223 | s->pcm_positions[i] = i; | |
224 | s->midi_position = s->pcm_channels; | |
31ef9134 | 225 | } |
be4a2894 | 226 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
227 | |
228 | /** | |
be4a2894 TS |
229 | * amdtp_stream_get_max_payload - get the stream's packet size |
230 | * @s: the AMDTP stream | |
31ef9134 CL |
231 | * |
232 | * This function must not be called before the stream has been configured | |
be4a2894 | 233 | * with amdtp_stream_set_parameters(). |
31ef9134 | 234 | */ |
be4a2894 | 235 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 236 | { |
e84d15f6 | 237 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 238 | } |
be4a2894 | 239 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 240 | |
be4a2894 | 241 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
242 | struct snd_pcm_substream *pcm, |
243 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 244 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
245 | struct snd_pcm_substream *pcm, |
246 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
247 | static void amdtp_read_s32(struct amdtp_stream *s, |
248 | struct snd_pcm_substream *pcm, | |
249 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
250 | |
251 | /** | |
be4a2894 TS |
252 | * amdtp_stream_set_pcm_format - set the PCM format |
253 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
254 | * @format: the format of the ALSA PCM device |
255 | * | |
a7304e3b CL |
256 | * The sample format must be set after the other paramters (rate/PCM channels/ |
257 | * MIDI) and before the stream is started, and must not be changed while the | |
258 | * stream is running. | |
31ef9134 | 259 | */ |
be4a2894 TS |
260 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
261 | snd_pcm_format_t format) | |
31ef9134 | 262 | { |
83d8d72d | 263 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
264 | return; |
265 | ||
266 | switch (format) { | |
267 | default: | |
268 | WARN_ON(1); | |
269 | /* fall through */ | |
270 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 | 271 | if (s->direction == AMDTP_OUT_STREAM) { |
10550bea | 272 | s->transfer_samples = amdtp_write_s16; |
2b3fc456 TS |
273 | break; |
274 | } | |
275 | WARN_ON(1); | |
276 | /* fall through */ | |
31ef9134 | 277 | case SNDRV_PCM_FORMAT_S32: |
10550bea TS |
278 | if (s->direction == AMDTP_OUT_STREAM) |
279 | s->transfer_samples = amdtp_write_s32; | |
280 | else | |
281 | s->transfer_samples = amdtp_read_s32; | |
31ef9134 CL |
282 | break; |
283 | } | |
284 | } | |
be4a2894 | 285 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 286 | |
76fb8789 | 287 | /** |
be4a2894 TS |
288 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
289 | * @s: the AMDTP stream | |
76fb8789 CL |
290 | * |
291 | * This function should be called from the PCM device's .prepare callback. | |
292 | */ | |
be4a2894 | 293 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
294 | { |
295 | tasklet_kill(&s->period_tasklet); | |
296 | s->pcm_buffer_pointer = 0; | |
297 | s->pcm_period_pointer = 0; | |
92b862c7 | 298 | s->pointer_flush = true; |
76fb8789 | 299 | } |
be4a2894 | 300 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 301 | |
be4a2894 | 302 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
303 | { |
304 | unsigned int phase, data_blocks; | |
305 | ||
ccccad86 TS |
306 | if (s->flags & CIP_BLOCKING) |
307 | data_blocks = s->syt_interval; | |
308 | else if (!cip_sfc_is_base_44100(s->sfc)) { | |
31ef9134 CL |
309 | /* Sample_rate / 8000 is an integer, and precomputed. */ |
310 | data_blocks = s->data_block_state; | |
311 | } else { | |
312 | phase = s->data_block_state; | |
313 | ||
314 | /* | |
315 | * This calculates the number of data blocks per packet so that | |
316 | * 1) the overall rate is correct and exactly synchronized to | |
317 | * the bus clock, and | |
318 | * 2) packets with a rounded-up number of blocks occur as early | |
319 | * as possible in the sequence (to prevent underruns of the | |
320 | * device's buffer). | |
321 | */ | |
322 | if (s->sfc == CIP_SFC_44100) | |
323 | /* 6 6 5 6 5 6 5 ... */ | |
324 | data_blocks = 5 + ((phase & 1) ^ | |
325 | (phase == 0 || phase >= 40)); | |
326 | else | |
327 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
328 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
329 | if (++phase >= (80 >> (s->sfc >> 1))) | |
330 | phase = 0; | |
331 | s->data_block_state = phase; | |
332 | } | |
333 | ||
334 | return data_blocks; | |
335 | } | |
336 | ||
be4a2894 | 337 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
338 | unsigned int cycle) |
339 | { | |
340 | unsigned int syt_offset, phase, index, syt; | |
341 | ||
342 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
343 | if (!cip_sfc_is_base_44100(s->sfc)) | |
344 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
345 | else { | |
346 | /* | |
347 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
348 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
349 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
350 | * elements is about 1386.23. Rounding the results of this | |
351 | * formula to the SYT precision results in a sequence of | |
352 | * differences that begins with: | |
353 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
354 | * This code generates _exactly_ the same sequence. | |
355 | */ | |
356 | phase = s->syt_offset_state; | |
357 | index = phase % 13; | |
358 | syt_offset = s->last_syt_offset; | |
359 | syt_offset += 1386 + ((index && !(index & 3)) || | |
360 | phase == 146); | |
361 | if (++phase >= 147) | |
362 | phase = 0; | |
363 | s->syt_offset_state = phase; | |
364 | } | |
365 | } else | |
366 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
367 | s->last_syt_offset = syt_offset; | |
368 | ||
be454366 | 369 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 370 | syt_offset += s->transfer_delay; |
be454366 CL |
371 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
372 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 373 | |
b445db44 | 374 | return syt & CIP_SYT_MASK; |
be454366 | 375 | } else { |
b445db44 | 376 | return CIP_SYT_NO_INFO; |
be454366 | 377 | } |
31ef9134 CL |
378 | } |
379 | ||
be4a2894 | 380 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
381 | struct snd_pcm_substream *pcm, |
382 | __be32 *buffer, unsigned int frames) | |
383 | { | |
384 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 385 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
386 | const u32 *src; |
387 | ||
388 | channels = s->pcm_channels; | |
389 | src = (void *)runtime->dma_area + | |
e84841f9 | 390 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 391 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
392 | |
393 | for (i = 0; i < frames; ++i) { | |
394 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
395 | buffer[s->pcm_positions[c]] = |
396 | cpu_to_be32((*src >> 8) | 0x40000000); | |
31ef9134 | 397 | src++; |
31ef9134 | 398 | } |
77d2a8a4 | 399 | buffer += s->data_block_quadlets; |
31ef9134 CL |
400 | if (--remaining_frames == 0) |
401 | src = (void *)runtime->dma_area; | |
402 | } | |
403 | } | |
404 | ||
be4a2894 | 405 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
406 | struct snd_pcm_substream *pcm, |
407 | __be32 *buffer, unsigned int frames) | |
408 | { | |
409 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 410 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
411 | const u16 *src; |
412 | ||
413 | channels = s->pcm_channels; | |
414 | src = (void *)runtime->dma_area + | |
e84841f9 | 415 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 416 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
417 | |
418 | for (i = 0; i < frames; ++i) { | |
419 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 420 | buffer[s->pcm_positions[c]] = |
a6975f2a | 421 | cpu_to_be32((*src << 8) | 0x42000000); |
31ef9134 | 422 | src++; |
31ef9134 | 423 | } |
77d2a8a4 | 424 | buffer += s->data_block_quadlets; |
31ef9134 CL |
425 | if (--remaining_frames == 0) |
426 | src = (void *)runtime->dma_area; | |
427 | } | |
428 | } | |
429 | ||
2b3fc456 TS |
430 | static void amdtp_read_s32(struct amdtp_stream *s, |
431 | struct snd_pcm_substream *pcm, | |
432 | __be32 *buffer, unsigned int frames) | |
433 | { | |
434 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
435 | unsigned int channels, remaining_frames, i, c; | |
436 | u32 *dst; | |
437 | ||
438 | channels = s->pcm_channels; | |
439 | dst = (void *)runtime->dma_area + | |
440 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
441 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
442 | ||
443 | for (i = 0; i < frames; ++i) { | |
444 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 445 | *dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8; |
2b3fc456 TS |
446 | dst++; |
447 | } | |
448 | buffer += s->data_block_quadlets; | |
449 | if (--remaining_frames == 0) | |
450 | dst = (void *)runtime->dma_area; | |
451 | } | |
452 | } | |
453 | ||
be4a2894 | 454 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
455 | __be32 *buffer, unsigned int frames) |
456 | { | |
457 | unsigned int i, c; | |
458 | ||
459 | for (i = 0; i < frames; ++i) { | |
460 | for (c = 0; c < s->pcm_channels; ++c) | |
77d2a8a4 | 461 | buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000); |
31ef9134 CL |
462 | buffer += s->data_block_quadlets; |
463 | } | |
464 | } | |
465 | ||
be4a2894 | 466 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
467 | __be32 *buffer, unsigned int frames) |
468 | { | |
83d8d72d TS |
469 | unsigned int f, port; |
470 | u8 *b; | |
471 | ||
472 | for (f = 0; f < frames; f++) { | |
77d2a8a4 TS |
473 | buffer[s->midi_position] = 0; |
474 | b = (u8 *)&buffer[s->midi_position]; | |
83d8d72d TS |
475 | |
476 | port = (s->data_block_counter + f) % 8; | |
53111cdc TS |
477 | if ((f >= s->rx_blocks_for_midi) || |
478 | (s->midi[port] == NULL) || | |
83d8d72d TS |
479 | (snd_rawmidi_transmit(s->midi[port], b + 1, 1) <= 0)) |
480 | b[0] = 0x80; | |
481 | else | |
482 | b[0] = 0x81; | |
483 | ||
484 | buffer += s->data_block_quadlets; | |
485 | } | |
486 | } | |
487 | ||
488 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
489 | __be32 *buffer, unsigned int frames) | |
490 | { | |
491 | unsigned int f, port; | |
492 | int len; | |
493 | u8 *b; | |
494 | ||
495 | for (f = 0; f < frames; f++) { | |
496 | port = (s->data_block_counter + f) % 8; | |
77d2a8a4 | 497 | b = (u8 *)&buffer[s->midi_position]; |
31ef9134 | 498 | |
83d8d72d TS |
499 | len = b[0] - 0x80; |
500 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
501 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
502 | ||
503 | buffer += s->data_block_quadlets; | |
504 | } | |
31ef9134 CL |
505 | } |
506 | ||
4b7da117 TS |
507 | static void update_pcm_pointers(struct amdtp_stream *s, |
508 | struct snd_pcm_substream *pcm, | |
509 | unsigned int frames) | |
65845f29 TS |
510 | { |
511 | unsigned int ptr; | |
512 | ||
513 | /* | |
514 | * In IEC 61883-6, one data block represents one event. In ALSA, one | |
515 | * event equals to one PCM frame. But Dice has a quirk to transfer | |
516 | * two PCM frames in one data block. | |
517 | */ | |
518 | if (s->double_pcm_frames) | |
519 | frames *= 2; | |
4b7da117 | 520 | |
4b7da117 TS |
521 | ptr = s->pcm_buffer_pointer + frames; |
522 | if (ptr >= pcm->runtime->buffer_size) | |
523 | ptr -= pcm->runtime->buffer_size; | |
524 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
525 | ||
526 | s->pcm_period_pointer += frames; | |
527 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
528 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
529 | s->pointer_flush = false; | |
530 | tasklet_hi_schedule(&s->period_tasklet); | |
531 | } | |
532 | } | |
533 | ||
534 | static void pcm_period_tasklet(unsigned long data) | |
535 | { | |
536 | struct amdtp_stream *s = (void *)data; | |
537 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
538 | ||
539 | if (pcm) | |
540 | snd_pcm_period_elapsed(pcm); | |
541 | } | |
542 | ||
543 | static int queue_packet(struct amdtp_stream *s, | |
544 | unsigned int header_length, | |
545 | unsigned int payload_length, bool skip) | |
546 | { | |
547 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
548 | int err = 0; |
549 | ||
550 | if (IS_ERR(s->context)) | |
551 | goto end; | |
4b7da117 TS |
552 | |
553 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
554 | p.tag = TAG_CIP; | |
555 | p.header_length = header_length; | |
556 | p.payload_length = (!skip) ? payload_length : 0; | |
557 | p.skip = skip; | |
558 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
559 | s->buffer.packets[s->packet_index].offset); | |
560 | if (err < 0) { | |
561 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
562 | goto end; | |
563 | } | |
564 | ||
565 | if (++s->packet_index >= QUEUE_LENGTH) | |
566 | s->packet_index = 0; | |
567 | end: | |
568 | return err; | |
569 | } | |
570 | ||
571 | static inline int queue_out_packet(struct amdtp_stream *s, | |
572 | unsigned int payload_length, bool skip) | |
573 | { | |
574 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
575 | payload_length, skip); | |
576 | } | |
577 | ||
2b3fc456 TS |
578 | static inline int queue_in_packet(struct amdtp_stream *s) |
579 | { | |
580 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
581 | amdtp_stream_get_max_payload(s), false); | |
582 | } | |
583 | ||
ccccad86 | 584 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
585 | { |
586 | __be32 *buffer; | |
ccccad86 | 587 | unsigned int data_blocks, payload_length; |
31ef9134 | 588 | struct snd_pcm_substream *pcm; |
31ef9134 | 589 | |
ec00f5e4 CL |
590 | if (s->packet_index < 0) |
591 | return; | |
ec00f5e4 | 592 | |
82755abf | 593 | /* this module generate empty packet for 'no data' */ |
ccccad86 | 594 | if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO)) |
e84d15f6 | 595 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
596 | else |
597 | data_blocks = 0; | |
31ef9134 | 598 | |
ccccad86 | 599 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 600 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 601 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
602 | s->data_block_counter); |
603 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 604 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
605 | buffer += 2; |
606 | ||
607 | pcm = ACCESS_ONCE(s->pcm); | |
608 | if (pcm) | |
609 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
610 | else | |
611 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
612 | if (s->midi_ports) | |
613 | amdtp_fill_midi(s, buffer, data_blocks); | |
614 | ||
615 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
616 | ||
4b7da117 TS |
617 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
618 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 619 | s->packet_index = -1; |
be4a2894 | 620 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
621 | return; |
622 | } | |
31ef9134 | 623 | |
76fb8789 | 624 | if (pcm) |
4b7da117 | 625 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
626 | } |
627 | ||
2b3fc456 TS |
628 | static void handle_in_packet(struct amdtp_stream *s, |
629 | unsigned int payload_quadlets, | |
630 | __be32 *buffer) | |
631 | { | |
632 | u32 cip_header[2]; | |
d9cd0065 TS |
633 | unsigned int data_blocks, data_block_quadlets, data_block_counter, |
634 | dbc_interval; | |
2b3fc456 | 635 | struct snd_pcm_substream *pcm = NULL; |
c8bdf49b | 636 | bool lost; |
2b3fc456 TS |
637 | |
638 | cip_header[0] = be32_to_cpu(buffer[0]); | |
639 | cip_header[1] = be32_to_cpu(buffer[1]); | |
640 | ||
641 | /* | |
642 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 643 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 TS |
644 | */ |
645 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
646 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
647 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
648 | dev_info_ratelimited(&s->unit->device, | |
649 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
650 | cip_header[0], cip_header[1]); | |
651 | goto end; | |
652 | } | |
653 | ||
654 | /* Calculate data blocks */ | |
655 | if (payload_quadlets < 3 || | |
656 | ((cip_header[1] & CIP_FDF_MASK) == | |
657 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
658 | data_blocks = 0; | |
659 | } else { | |
660 | data_block_quadlets = | |
661 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
662 | /* avoid division by zero */ | |
663 | if (data_block_quadlets == 0) { | |
664 | dev_info_ratelimited(&s->unit->device, | |
665 | "Detect invalid value in dbs field: %08X\n", | |
666 | cip_header[0]); | |
667 | goto err; | |
668 | } | |
69702239 TS |
669 | if (s->flags & CIP_WRONG_DBS) |
670 | data_block_quadlets = s->data_block_quadlets; | |
2b3fc456 TS |
671 | |
672 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
673 | } | |
674 | ||
675 | /* Check data block counter continuity */ | |
676 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
9d59124c TS |
677 | if (data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && |
678 | s->data_block_counter != UINT_MAX) | |
679 | data_block_counter = s->data_block_counter; | |
680 | ||
b6bc8123 TS |
681 | if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) && data_block_counter == 0) || |
682 | (s->data_block_counter == UINT_MAX)) { | |
b84b1a27 TS |
683 | lost = false; |
684 | } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { | |
c8bdf49b | 685 | lost = data_block_counter != s->data_block_counter; |
d9cd0065 TS |
686 | } else { |
687 | if ((data_blocks > 0) && (s->tx_dbc_interval > 0)) | |
688 | dbc_interval = s->tx_dbc_interval; | |
689 | else | |
690 | dbc_interval = data_blocks; | |
691 | ||
c8bdf49b | 692 | lost = data_block_counter != |
d9cd0065 TS |
693 | ((s->data_block_counter + dbc_interval) & 0xff); |
694 | } | |
c8bdf49b TS |
695 | |
696 | if (lost) { | |
2b3fc456 TS |
697 | dev_info(&s->unit->device, |
698 | "Detect discontinuity of CIP: %02X %02X\n", | |
699 | s->data_block_counter, data_block_counter); | |
700 | goto err; | |
701 | } | |
702 | ||
703 | if (data_blocks > 0) { | |
704 | buffer += 2; | |
705 | ||
706 | pcm = ACCESS_ONCE(s->pcm); | |
707 | if (pcm) | |
708 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
709 | |
710 | if (s->midi_ports) | |
711 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
712 | } |
713 | ||
c8bdf49b TS |
714 | if (s->flags & CIP_DBC_IS_END_EVENT) |
715 | s->data_block_counter = data_block_counter; | |
716 | else | |
717 | s->data_block_counter = | |
718 | (data_block_counter + data_blocks) & 0xff; | |
2b3fc456 TS |
719 | end: |
720 | if (queue_in_packet(s) < 0) | |
721 | goto err; | |
722 | ||
723 | if (pcm) | |
724 | update_pcm_pointers(s, pcm, data_blocks); | |
725 | ||
726 | return; | |
727 | err: | |
728 | s->packet_index = -1; | |
729 | amdtp_stream_pcm_abort(s); | |
730 | } | |
731 | ||
4b7da117 TS |
732 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
733 | size_t header_length, void *header, | |
734 | void *private_data) | |
31ef9134 | 735 | { |
be4a2894 | 736 | struct amdtp_stream *s = private_data; |
ccccad86 | 737 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
738 | |
739 | /* | |
740 | * Compute the cycle of the last queued packet. | |
741 | * (We need only the four lowest bits for the SYT, so we can ignore | |
742 | * that bits 0-11 must wrap around at 3072.) | |
743 | */ | |
744 | cycle += QUEUE_LENGTH - packets; | |
745 | ||
ccccad86 TS |
746 | for (i = 0; i < packets; ++i) { |
747 | syt = calculate_syt(s, ++cycle); | |
748 | handle_out_packet(s, syt); | |
749 | } | |
13882a82 | 750 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
751 | } |
752 | ||
2b3fc456 TS |
753 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
754 | size_t header_length, void *header, | |
755 | void *private_data) | |
756 | { | |
757 | struct amdtp_stream *s = private_data; | |
7b3b0d85 | 758 | unsigned int p, syt, packets, payload_quadlets; |
2b3fc456 TS |
759 | __be32 *buffer, *headers = header; |
760 | ||
761 | /* The number of packets in buffer */ | |
762 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
763 | ||
764 | for (p = 0; p < packets; p++) { | |
765 | if (s->packet_index < 0) | |
7b3b0d85 TS |
766 | break; |
767 | ||
2b3fc456 TS |
768 | buffer = s->buffer.packets[s->packet_index].buffer; |
769 | ||
7b3b0d85 TS |
770 | /* Process sync slave stream */ |
771 | if (s->sync_slave && s->sync_slave->callbacked) { | |
772 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
773 | handle_out_packet(s->sync_slave, syt); | |
774 | } | |
775 | ||
2b3fc456 TS |
776 | /* The number of quadlets in this packet */ |
777 | payload_quadlets = | |
778 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
779 | handle_in_packet(s, payload_quadlets, buffer); | |
780 | } | |
781 | ||
7b3b0d85 TS |
782 | /* Queueing error or detecting discontinuity */ |
783 | if (s->packet_index < 0) { | |
784 | /* Abort sync slave. */ | |
785 | if (s->sync_slave) { | |
786 | s->sync_slave->packet_index = -1; | |
787 | amdtp_stream_pcm_abort(s->sync_slave); | |
788 | } | |
789 | return; | |
790 | } | |
791 | ||
792 | /* when sync to device, flush the packets for slave stream */ | |
793 | if (s->sync_slave && s->sync_slave->callbacked) | |
794 | fw_iso_context_queue_flush(s->sync_slave->context); | |
795 | ||
2b3fc456 TS |
796 | fw_iso_context_queue_flush(s->context); |
797 | } | |
798 | ||
7b3b0d85 TS |
799 | /* processing is done by master callback */ |
800 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
801 | size_t header_length, void *header, | |
802 | void *private_data) | |
803 | { | |
804 | return; | |
805 | } | |
806 | ||
807 | /* this is executed one time */ | |
808 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
809 | u32 cycle, size_t header_length, | |
810 | void *header, void *private_data) | |
811 | { | |
812 | struct amdtp_stream *s = private_data; | |
813 | ||
814 | /* | |
815 | * For in-stream, first packet has come. | |
816 | * For out-stream, prepared to transmit first packet | |
817 | */ | |
818 | s->callbacked = true; | |
819 | wake_up(&s->callback_wait); | |
820 | ||
821 | if (s->direction == AMDTP_IN_STREAM) | |
822 | context->callback.sc = in_stream_callback; | |
823 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
824 | context->callback.sc = slave_stream_callback; | |
825 | else | |
826 | context->callback.sc = out_stream_callback; | |
827 | ||
828 | context->callback.sc(context, cycle, header_length, header, s); | |
829 | } | |
830 | ||
31ef9134 | 831 | /** |
be4a2894 TS |
832 | * amdtp_stream_start - start transferring packets |
833 | * @s: the AMDTP stream to start | |
31ef9134 CL |
834 | * @channel: the isochronous channel on the bus |
835 | * @speed: firewire speed code | |
836 | * | |
837 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
838 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
839 | * device can be started. | |
31ef9134 | 840 | */ |
be4a2894 | 841 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
842 | { |
843 | static const struct { | |
844 | unsigned int data_block; | |
845 | unsigned int syt_offset; | |
846 | } initial_state[] = { | |
847 | [CIP_SFC_32000] = { 4, 3072 }, | |
848 | [CIP_SFC_48000] = { 6, 1024 }, | |
849 | [CIP_SFC_96000] = { 12, 1024 }, | |
850 | [CIP_SFC_192000] = { 24, 1024 }, | |
851 | [CIP_SFC_44100] = { 0, 67 }, | |
852 | [CIP_SFC_88200] = { 0, 67 }, | |
853 | [CIP_SFC_176400] = { 0, 67 }, | |
854 | }; | |
2b3fc456 TS |
855 | unsigned int header_size; |
856 | enum dma_data_direction dir; | |
7ab56645 | 857 | int type, tag, err; |
31ef9134 CL |
858 | |
859 | mutex_lock(&s->mutex); | |
860 | ||
be4a2894 | 861 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 862 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
863 | err = -EBADFD; |
864 | goto err_unlock; | |
865 | } | |
866 | ||
b6bc8123 TS |
867 | if (s->direction == AMDTP_IN_STREAM && |
868 | s->flags & CIP_SKIP_INIT_DBC_CHECK) | |
869 | s->data_block_counter = UINT_MAX; | |
870 | else | |
871 | s->data_block_counter = 0; | |
31ef9134 CL |
872 | s->data_block_state = initial_state[s->sfc].data_block; |
873 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
874 | s->last_syt_offset = TICKS_PER_CYCLE; | |
875 | ||
2b3fc456 TS |
876 | /* initialize packet buffer */ |
877 | if (s->direction == AMDTP_IN_STREAM) { | |
878 | dir = DMA_FROM_DEVICE; | |
879 | type = FW_ISO_CONTEXT_RECEIVE; | |
880 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
881 | } else { |
882 | dir = DMA_TO_DEVICE; | |
883 | type = FW_ISO_CONTEXT_TRANSMIT; | |
884 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 885 | } |
31ef9134 | 886 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 887 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
888 | if (err < 0) |
889 | goto err_unlock; | |
890 | ||
891 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 892 | type, channel, speed, header_size, |
7b3b0d85 | 893 | amdtp_stream_first_callback, s); |
31ef9134 CL |
894 | if (IS_ERR(s->context)) { |
895 | err = PTR_ERR(s->context); | |
896 | if (err == -EBUSY) | |
897 | dev_err(&s->unit->device, | |
be4a2894 | 898 | "no free stream on this controller\n"); |
31ef9134 CL |
899 | goto err_buffer; |
900 | } | |
901 | ||
be4a2894 | 902 | amdtp_stream_update(s); |
31ef9134 | 903 | |
ec00f5e4 | 904 | s->packet_index = 0; |
4b7da117 | 905 | do { |
2b3fc456 TS |
906 | if (s->direction == AMDTP_IN_STREAM) |
907 | err = queue_in_packet(s); | |
908 | else | |
909 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
910 | if (err < 0) |
911 | goto err_context; | |
912 | } while (s->packet_index > 0); | |
31ef9134 | 913 | |
2b3fc456 | 914 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7ab56645 TS |
915 | tag = FW_ISO_CONTEXT_MATCH_TAG1; |
916 | if (s->flags & CIP_EMPTY_WITH_TAG0) | |
917 | tag |= FW_ISO_CONTEXT_MATCH_TAG0; | |
918 | ||
7b3b0d85 | 919 | s->callbacked = false; |
7ab56645 | 920 | err = fw_iso_context_start(s->context, -1, 0, tag); |
31ef9134 CL |
921 | if (err < 0) |
922 | goto err_context; | |
923 | ||
924 | mutex_unlock(&s->mutex); | |
925 | ||
926 | return 0; | |
927 | ||
928 | err_context: | |
929 | fw_iso_context_destroy(s->context); | |
930 | s->context = ERR_PTR(-1); | |
931 | err_buffer: | |
932 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
933 | err_unlock: | |
934 | mutex_unlock(&s->mutex); | |
935 | ||
936 | return err; | |
937 | } | |
be4a2894 | 938 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 939 | |
e9148ddd | 940 | /** |
be4a2894 TS |
941 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
942 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
943 | * |
944 | * Returns the current buffer position, in frames. | |
945 | */ | |
be4a2894 | 946 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 947 | { |
92b862c7 | 948 | /* this optimization is allowed to be racy */ |
c8de6dbb | 949 | if (s->pointer_flush && amdtp_stream_running(s)) |
92b862c7 CL |
950 | fw_iso_context_flush_completions(s->context); |
951 | else | |
952 | s->pointer_flush = true; | |
e9148ddd CL |
953 | |
954 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
955 | } | |
be4a2894 | 956 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 957 | |
31ef9134 | 958 | /** |
be4a2894 TS |
959 | * amdtp_stream_update - update the stream after a bus reset |
960 | * @s: the AMDTP stream | |
31ef9134 | 961 | */ |
be4a2894 | 962 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
963 | { |
964 | ACCESS_ONCE(s->source_node_id_field) = | |
965 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
966 | } | |
be4a2894 | 967 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
968 | |
969 | /** | |
be4a2894 TS |
970 | * amdtp_stream_stop - stop sending packets |
971 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
972 | * |
973 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
974 | * itself can be stopped. | |
975 | */ | |
be4a2894 | 976 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
977 | { |
978 | mutex_lock(&s->mutex); | |
979 | ||
be4a2894 | 980 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
981 | mutex_unlock(&s->mutex); |
982 | return; | |
983 | } | |
984 | ||
76fb8789 | 985 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
986 | fw_iso_context_stop(s->context); |
987 | fw_iso_context_destroy(s->context); | |
988 | s->context = ERR_PTR(-1); | |
989 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
990 | ||
7b3b0d85 TS |
991 | s->callbacked = false; |
992 | ||
31ef9134 CL |
993 | mutex_unlock(&s->mutex); |
994 | } | |
be4a2894 | 995 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
996 | |
997 | /** | |
be4a2894 | 998 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
999 | * @s: the AMDTP stream about to be stopped |
1000 | * | |
1001 | * If the isochronous stream needs to be stopped asynchronously, call this | |
1002 | * function first to stop the PCM device. | |
1003 | */ | |
be4a2894 | 1004 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
1005 | { |
1006 | struct snd_pcm_substream *pcm; | |
1007 | ||
1008 | pcm = ACCESS_ONCE(s->pcm); | |
1fb8510c TI |
1009 | if (pcm) |
1010 | snd_pcm_stop_xrun(pcm); | |
31ef9134 | 1011 | } |
be4a2894 | 1012 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |