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> |
83d8d72d | 16 | #include <sound/rawmidi.h> |
31ef9134 CL |
17 | #include "amdtp.h" |
18 | ||
19 | #define TICKS_PER_CYCLE 3072 | |
20 | #define CYCLES_PER_SECOND 8000 | |
21 | #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) | |
22 | ||
23 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ | |
24 | ||
b445db44 TS |
25 | /* isochronous header parameters */ |
26 | #define ISO_DATA_LENGTH_SHIFT 16 | |
31ef9134 CL |
27 | #define TAG_CIP 1 |
28 | ||
b445db44 | 29 | /* common isochronous packet header parameters */ |
31ef9134 | 30 | #define CIP_EOH (1u << 31) |
b445db44 | 31 | #define CIP_EOH_MASK 0x80000000 |
31ef9134 | 32 | #define CIP_FMT_AM (0x10 << 24) |
b445db44 TS |
33 | #define CIP_FMT_MASK 0x3f000000 |
34 | #define CIP_SYT_MASK 0x0000ffff | |
35 | #define CIP_SYT_NO_INFO 0xffff | |
36 | #define CIP_FDF_MASK 0x00ff0000 | |
37 | #define CIP_FDF_SFC_SHIFT 16 | |
38 | ||
39 | /* | |
40 | * Audio and Music transfer protocol specific parameters | |
41 | * only "Clock-based rate control mode" is supported | |
42 | */ | |
43 | #define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3)) | |
2b3fc456 | 44 | #define AMDTP_FDF_NO_DATA 0xff |
b445db44 TS |
45 | #define AMDTP_DBS_MASK 0x00ff0000 |
46 | #define AMDTP_DBS_SHIFT 16 | |
47 | #define AMDTP_DBC_MASK 0x000000ff | |
31ef9134 CL |
48 | |
49 | /* TODO: make these configurable */ | |
50 | #define INTERRUPT_INTERVAL 16 | |
51 | #define QUEUE_LENGTH 48 | |
52 | ||
2b3fc456 | 53 | #define IN_PACKET_HEADER_SIZE 4 |
4b7da117 TS |
54 | #define OUT_PACKET_HEADER_SIZE 0 |
55 | ||
76fb8789 CL |
56 | static void pcm_period_tasklet(unsigned long data); |
57 | ||
31ef9134 | 58 | /** |
be4a2894 TS |
59 | * amdtp_stream_init - initialize an AMDTP stream structure |
60 | * @s: the AMDTP stream to initialize | |
31ef9134 | 61 | * @unit: the target of the stream |
3ff7e8f0 | 62 | * @dir: the direction of stream |
31ef9134 CL |
63 | * @flags: the packet transmission method to use |
64 | */ | |
be4a2894 | 65 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
3ff7e8f0 | 66 | enum amdtp_stream_direction dir, enum cip_flags flags) |
31ef9134 | 67 | { |
31ef9134 | 68 | s->unit = fw_unit_get(unit); |
3ff7e8f0 | 69 | s->direction = dir; |
31ef9134 CL |
70 | s->flags = flags; |
71 | s->context = ERR_PTR(-1); | |
72 | mutex_init(&s->mutex); | |
76fb8789 | 73 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 74 | s->packet_index = 0; |
31ef9134 | 75 | |
7b3b0d85 TS |
76 | init_waitqueue_head(&s->callback_wait); |
77 | s->callbacked = false; | |
78 | s->sync_slave = NULL; | |
79 | ||
31ef9134 CL |
80 | return 0; |
81 | } | |
be4a2894 | 82 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
83 | |
84 | /** | |
be4a2894 TS |
85 | * amdtp_stream_destroy - free stream resources |
86 | * @s: the AMDTP stream to destroy | |
31ef9134 | 87 | */ |
be4a2894 | 88 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 89 | { |
be4a2894 | 90 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
91 | mutex_destroy(&s->mutex); |
92 | fw_unit_put(s->unit); | |
93 | } | |
be4a2894 | 94 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 95 | |
c5280e99 | 96 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
97 | [CIP_SFC_32000] = 8, |
98 | [CIP_SFC_44100] = 8, | |
99 | [CIP_SFC_48000] = 8, | |
100 | [CIP_SFC_88200] = 16, | |
101 | [CIP_SFC_96000] = 16, | |
102 | [CIP_SFC_176400] = 32, | |
103 | [CIP_SFC_192000] = 32, | |
104 | }; | |
105 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
106 | ||
31ef9134 | 107 | /** |
be4a2894 TS |
108 | * amdtp_stream_set_parameters - set stream parameters |
109 | * @s: the AMDTP stream to configure | |
31ef9134 | 110 | * @rate: the sample rate |
a7304e3b CL |
111 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
112 | * as AM824 multi-bit linear audio | |
113 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 114 | * |
a7304e3b | 115 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
116 | * changed while the stream is running. |
117 | */ | |
be4a2894 TS |
118 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
119 | unsigned int rate, | |
120 | unsigned int pcm_channels, | |
121 | unsigned int midi_ports) | |
31ef9134 | 122 | { |
a7304e3b CL |
123 | static const unsigned int rates[] = { |
124 | [CIP_SFC_32000] = 32000, | |
125 | [CIP_SFC_44100] = 44100, | |
126 | [CIP_SFC_48000] = 48000, | |
127 | [CIP_SFC_88200] = 88200, | |
128 | [CIP_SFC_96000] = 96000, | |
129 | [CIP_SFC_176400] = 176400, | |
130 | [CIP_SFC_192000] = 192000, | |
31ef9134 | 131 | }; |
83d8d72d | 132 | unsigned int sfc, midi_channels; |
31ef9134 | 133 | |
83d8d72d TS |
134 | midi_channels = DIV_ROUND_UP(midi_ports, 8); |
135 | ||
136 | if (WARN_ON(amdtp_stream_running(s)) || | |
137 | WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI)) | |
31ef9134 CL |
138 | return; |
139 | ||
a7304e3b CL |
140 | for (sfc = 0; sfc < CIP_SFC_COUNT; ++sfc) |
141 | if (rates[sfc] == rate) | |
e84d15f6 | 142 | goto sfc_found; |
31ef9134 | 143 | WARN_ON(1); |
e84d15f6 CL |
144 | return; |
145 | ||
146 | sfc_found: | |
a7304e3b CL |
147 | s->dual_wire = (s->flags & CIP_HI_DUALWIRE) && sfc > CIP_SFC_96000; |
148 | if (s->dual_wire) { | |
149 | sfc -= 2; | |
150 | rate /= 2; | |
151 | pcm_channels *= 2; | |
152 | } | |
e84d15f6 | 153 | s->sfc = sfc; |
83d8d72d | 154 | s->data_block_quadlets = pcm_channels + midi_channels; |
a7304e3b CL |
155 | s->pcm_channels = pcm_channels; |
156 | s->midi_ports = midi_ports; | |
157 | ||
158 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
159 | |
160 | /* default buffering in the device */ | |
161 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
162 | if (s->flags & CIP_BLOCKING) | |
163 | /* additional buffering needed to adjust for no-data packets */ | |
164 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
31ef9134 | 165 | } |
be4a2894 | 166 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
167 | |
168 | /** | |
be4a2894 TS |
169 | * amdtp_stream_get_max_payload - get the stream's packet size |
170 | * @s: the AMDTP stream | |
31ef9134 CL |
171 | * |
172 | * This function must not be called before the stream has been configured | |
be4a2894 | 173 | * with amdtp_stream_set_parameters(). |
31ef9134 | 174 | */ |
be4a2894 | 175 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 176 | { |
e84d15f6 | 177 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 178 | } |
be4a2894 | 179 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 180 | |
be4a2894 | 181 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
182 | struct snd_pcm_substream *pcm, |
183 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 184 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
185 | struct snd_pcm_substream *pcm, |
186 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 187 | static void amdtp_write_s16_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
188 | struct snd_pcm_substream *pcm, |
189 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 190 | static void amdtp_write_s32_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
191 | struct snd_pcm_substream *pcm, |
192 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
193 | static void amdtp_read_s32(struct amdtp_stream *s, |
194 | struct snd_pcm_substream *pcm, | |
195 | __be32 *buffer, unsigned int frames); | |
196 | static void amdtp_read_s32_dualwire(struct amdtp_stream *s, | |
197 | struct snd_pcm_substream *pcm, | |
198 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
199 | |
200 | /** | |
be4a2894 TS |
201 | * amdtp_stream_set_pcm_format - set the PCM format |
202 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
203 | * @format: the format of the ALSA PCM device |
204 | * | |
a7304e3b CL |
205 | * The sample format must be set after the other paramters (rate/PCM channels/ |
206 | * MIDI) and before the stream is started, and must not be changed while the | |
207 | * stream is running. | |
31ef9134 | 208 | */ |
be4a2894 TS |
209 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
210 | snd_pcm_format_t format) | |
31ef9134 | 211 | { |
83d8d72d | 212 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
213 | return; |
214 | ||
215 | switch (format) { | |
216 | default: | |
217 | WARN_ON(1); | |
218 | /* fall through */ | |
219 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 TS |
220 | if (s->direction == AMDTP_OUT_STREAM) { |
221 | if (s->dual_wire) | |
222 | s->transfer_samples = amdtp_write_s16_dualwire; | |
223 | else | |
224 | s->transfer_samples = amdtp_write_s16; | |
225 | break; | |
226 | } | |
227 | WARN_ON(1); | |
228 | /* fall through */ | |
31ef9134 | 229 | case SNDRV_PCM_FORMAT_S32: |
2b3fc456 TS |
230 | if (s->direction == AMDTP_OUT_STREAM) { |
231 | if (s->dual_wire) | |
232 | s->transfer_samples = amdtp_write_s32_dualwire; | |
233 | else | |
234 | s->transfer_samples = amdtp_write_s32; | |
235 | } else { | |
236 | if (s->dual_wire) | |
237 | s->transfer_samples = amdtp_read_s32_dualwire; | |
238 | else | |
239 | s->transfer_samples = amdtp_read_s32; | |
240 | } | |
31ef9134 CL |
241 | break; |
242 | } | |
243 | } | |
be4a2894 | 244 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 245 | |
76fb8789 | 246 | /** |
be4a2894 TS |
247 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
248 | * @s: the AMDTP stream | |
76fb8789 CL |
249 | * |
250 | * This function should be called from the PCM device's .prepare callback. | |
251 | */ | |
be4a2894 | 252 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
253 | { |
254 | tasklet_kill(&s->period_tasklet); | |
255 | s->pcm_buffer_pointer = 0; | |
256 | s->pcm_period_pointer = 0; | |
92b862c7 | 257 | s->pointer_flush = true; |
76fb8789 | 258 | } |
be4a2894 | 259 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 260 | |
be4a2894 | 261 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
262 | { |
263 | unsigned int phase, data_blocks; | |
264 | ||
ccccad86 TS |
265 | if (s->flags & CIP_BLOCKING) |
266 | data_blocks = s->syt_interval; | |
267 | else if (!cip_sfc_is_base_44100(s->sfc)) { | |
31ef9134 CL |
268 | /* Sample_rate / 8000 is an integer, and precomputed. */ |
269 | data_blocks = s->data_block_state; | |
270 | } else { | |
271 | phase = s->data_block_state; | |
272 | ||
273 | /* | |
274 | * This calculates the number of data blocks per packet so that | |
275 | * 1) the overall rate is correct and exactly synchronized to | |
276 | * the bus clock, and | |
277 | * 2) packets with a rounded-up number of blocks occur as early | |
278 | * as possible in the sequence (to prevent underruns of the | |
279 | * device's buffer). | |
280 | */ | |
281 | if (s->sfc == CIP_SFC_44100) | |
282 | /* 6 6 5 6 5 6 5 ... */ | |
283 | data_blocks = 5 + ((phase & 1) ^ | |
284 | (phase == 0 || phase >= 40)); | |
285 | else | |
286 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
287 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
288 | if (++phase >= (80 >> (s->sfc >> 1))) | |
289 | phase = 0; | |
290 | s->data_block_state = phase; | |
291 | } | |
292 | ||
293 | return data_blocks; | |
294 | } | |
295 | ||
be4a2894 | 296 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
297 | unsigned int cycle) |
298 | { | |
299 | unsigned int syt_offset, phase, index, syt; | |
300 | ||
301 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
302 | if (!cip_sfc_is_base_44100(s->sfc)) | |
303 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
304 | else { | |
305 | /* | |
306 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
307 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
308 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
309 | * elements is about 1386.23. Rounding the results of this | |
310 | * formula to the SYT precision results in a sequence of | |
311 | * differences that begins with: | |
312 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
313 | * This code generates _exactly_ the same sequence. | |
314 | */ | |
315 | phase = s->syt_offset_state; | |
316 | index = phase % 13; | |
317 | syt_offset = s->last_syt_offset; | |
318 | syt_offset += 1386 + ((index && !(index & 3)) || | |
319 | phase == 146); | |
320 | if (++phase >= 147) | |
321 | phase = 0; | |
322 | s->syt_offset_state = phase; | |
323 | } | |
324 | } else | |
325 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
326 | s->last_syt_offset = syt_offset; | |
327 | ||
be454366 | 328 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 329 | syt_offset += s->transfer_delay; |
be454366 CL |
330 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
331 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 332 | |
b445db44 | 333 | return syt & CIP_SYT_MASK; |
be454366 | 334 | } else { |
b445db44 | 335 | return CIP_SYT_NO_INFO; |
be454366 | 336 | } |
31ef9134 CL |
337 | } |
338 | ||
be4a2894 | 339 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
340 | struct snd_pcm_substream *pcm, |
341 | __be32 *buffer, unsigned int frames) | |
342 | { | |
343 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
344 | unsigned int channels, remaining_frames, frame_step, i, c; | |
345 | const u32 *src; | |
346 | ||
347 | channels = s->pcm_channels; | |
348 | src = (void *)runtime->dma_area + | |
e84841f9 | 349 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 CL |
350 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
351 | frame_step = s->data_block_quadlets - channels; | |
352 | ||
353 | for (i = 0; i < frames; ++i) { | |
354 | for (c = 0; c < channels; ++c) { | |
355 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
356 | src++; | |
357 | buffer++; | |
358 | } | |
359 | buffer += frame_step; | |
360 | if (--remaining_frames == 0) | |
361 | src = (void *)runtime->dma_area; | |
362 | } | |
363 | } | |
364 | ||
be4a2894 | 365 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
366 | struct snd_pcm_substream *pcm, |
367 | __be32 *buffer, unsigned int frames) | |
368 | { | |
369 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
370 | unsigned int channels, remaining_frames, frame_step, i, c; | |
371 | const u16 *src; | |
372 | ||
373 | channels = s->pcm_channels; | |
374 | src = (void *)runtime->dma_area + | |
e84841f9 | 375 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 CL |
376 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
377 | frame_step = s->data_block_quadlets - channels; | |
378 | ||
379 | for (i = 0; i < frames; ++i) { | |
380 | for (c = 0; c < channels; ++c) { | |
381 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
382 | src++; | |
383 | buffer++; | |
384 | } | |
385 | buffer += frame_step; | |
386 | if (--remaining_frames == 0) | |
387 | src = (void *)runtime->dma_area; | |
388 | } | |
389 | } | |
390 | ||
be4a2894 | 391 | static void amdtp_write_s32_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
392 | struct snd_pcm_substream *pcm, |
393 | __be32 *buffer, unsigned int frames) | |
394 | { | |
395 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
396 | unsigned int channels, frame_adjust_1, frame_adjust_2, i, c; | |
397 | const u32 *src; | |
398 | ||
399 | channels = s->pcm_channels; | |
400 | src = (void *)runtime->dma_area + | |
401 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
402 | frame_adjust_1 = channels - 1; | |
403 | frame_adjust_2 = 1 - (s->data_block_quadlets - channels); | |
404 | ||
405 | channels /= 2; | |
406 | for (i = 0; i < frames; ++i) { | |
407 | for (c = 0; c < channels; ++c) { | |
408 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
409 | src++; | |
410 | buffer += 2; | |
411 | } | |
412 | buffer -= frame_adjust_1; | |
413 | for (c = 0; c < channels; ++c) { | |
414 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
415 | src++; | |
416 | buffer += 2; | |
417 | } | |
418 | buffer -= frame_adjust_2; | |
419 | } | |
420 | } | |
421 | ||
be4a2894 | 422 | static void amdtp_write_s16_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
423 | struct snd_pcm_substream *pcm, |
424 | __be32 *buffer, unsigned int frames) | |
425 | { | |
426 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
427 | unsigned int channels, frame_adjust_1, frame_adjust_2, i, c; | |
428 | const u16 *src; | |
429 | ||
430 | channels = s->pcm_channels; | |
431 | src = (void *)runtime->dma_area + | |
432 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
433 | frame_adjust_1 = channels - 1; | |
434 | frame_adjust_2 = 1 - (s->data_block_quadlets - channels); | |
435 | ||
436 | channels /= 2; | |
437 | for (i = 0; i < frames; ++i) { | |
438 | for (c = 0; c < channels; ++c) { | |
439 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
440 | src++; | |
441 | buffer += 2; | |
442 | } | |
443 | buffer -= frame_adjust_1; | |
444 | for (c = 0; c < channels; ++c) { | |
445 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
446 | src++; | |
447 | buffer += 2; | |
448 | } | |
449 | buffer -= frame_adjust_2; | |
450 | } | |
451 | } | |
452 | ||
2b3fc456 TS |
453 | static void amdtp_read_s32(struct amdtp_stream *s, |
454 | struct snd_pcm_substream *pcm, | |
455 | __be32 *buffer, unsigned int frames) | |
456 | { | |
457 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
458 | unsigned int channels, remaining_frames, i, c; | |
459 | u32 *dst; | |
460 | ||
461 | channels = s->pcm_channels; | |
462 | dst = (void *)runtime->dma_area + | |
463 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
464 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
465 | ||
466 | for (i = 0; i < frames; ++i) { | |
467 | for (c = 0; c < channels; ++c) { | |
468 | *dst = be32_to_cpu(buffer[c]) << 8; | |
469 | dst++; | |
470 | } | |
471 | buffer += s->data_block_quadlets; | |
472 | if (--remaining_frames == 0) | |
473 | dst = (void *)runtime->dma_area; | |
474 | } | |
475 | } | |
476 | ||
477 | static void amdtp_read_s32_dualwire(struct amdtp_stream *s, | |
478 | struct snd_pcm_substream *pcm, | |
479 | __be32 *buffer, unsigned int frames) | |
480 | { | |
481 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
482 | unsigned int channels, remaining_frames, i, c; | |
483 | u32 *dst; | |
484 | ||
485 | dst = (void *)runtime->dma_area + | |
486 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
487 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
488 | channels = s->pcm_channels / 2; | |
489 | ||
490 | for (i = 0; i < frames; ++i) { | |
491 | for (c = 0; c < channels; ++c) { | |
492 | *dst = be32_to_cpu(buffer[c * 2]) << 8; | |
493 | dst++; | |
494 | } | |
495 | buffer += 1; | |
496 | for (c = 0; c < channels; ++c) { | |
497 | *dst = be32_to_cpu(buffer[c * 2]) << 8; | |
498 | dst++; | |
499 | } | |
500 | buffer += s->data_block_quadlets - 1; | |
501 | if (--remaining_frames == 0) | |
502 | dst = (void *)runtime->dma_area; | |
503 | } | |
504 | } | |
505 | ||
be4a2894 | 506 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
507 | __be32 *buffer, unsigned int frames) |
508 | { | |
509 | unsigned int i, c; | |
510 | ||
511 | for (i = 0; i < frames; ++i) { | |
512 | for (c = 0; c < s->pcm_channels; ++c) | |
513 | buffer[c] = cpu_to_be32(0x40000000); | |
514 | buffer += s->data_block_quadlets; | |
515 | } | |
516 | } | |
517 | ||
be4a2894 | 518 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
519 | __be32 *buffer, unsigned int frames) |
520 | { | |
83d8d72d TS |
521 | unsigned int f, port; |
522 | u8 *b; | |
523 | ||
524 | for (f = 0; f < frames; f++) { | |
525 | buffer[s->pcm_channels + 1] = 0; | |
526 | b = (u8 *)&buffer[s->pcm_channels + 1]; | |
527 | ||
528 | port = (s->data_block_counter + f) % 8; | |
529 | if ((s->midi[port] == NULL) || | |
530 | (snd_rawmidi_transmit(s->midi[port], b + 1, 1) <= 0)) | |
531 | b[0] = 0x80; | |
532 | else | |
533 | b[0] = 0x81; | |
534 | ||
535 | buffer += s->data_block_quadlets; | |
536 | } | |
537 | } | |
538 | ||
539 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
540 | __be32 *buffer, unsigned int frames) | |
541 | { | |
542 | unsigned int f, port; | |
543 | int len; | |
544 | u8 *b; | |
545 | ||
546 | for (f = 0; f < frames; f++) { | |
547 | port = (s->data_block_counter + f) % 8; | |
548 | b = (u8 *)&buffer[s->pcm_channels + 1]; | |
31ef9134 | 549 | |
83d8d72d TS |
550 | len = b[0] - 0x80; |
551 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
552 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
553 | ||
554 | buffer += s->data_block_quadlets; | |
555 | } | |
31ef9134 CL |
556 | } |
557 | ||
4b7da117 TS |
558 | static void update_pcm_pointers(struct amdtp_stream *s, |
559 | struct snd_pcm_substream *pcm, | |
560 | unsigned int frames) | |
561 | { unsigned int ptr; | |
562 | ||
563 | if (s->dual_wire) | |
564 | frames *= 2; | |
565 | ||
566 | ptr = s->pcm_buffer_pointer + frames; | |
567 | if (ptr >= pcm->runtime->buffer_size) | |
568 | ptr -= pcm->runtime->buffer_size; | |
569 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
570 | ||
571 | s->pcm_period_pointer += frames; | |
572 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
573 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
574 | s->pointer_flush = false; | |
575 | tasklet_hi_schedule(&s->period_tasklet); | |
576 | } | |
577 | } | |
578 | ||
579 | static void pcm_period_tasklet(unsigned long data) | |
580 | { | |
581 | struct amdtp_stream *s = (void *)data; | |
582 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
583 | ||
584 | if (pcm) | |
585 | snd_pcm_period_elapsed(pcm); | |
586 | } | |
587 | ||
588 | static int queue_packet(struct amdtp_stream *s, | |
589 | unsigned int header_length, | |
590 | unsigned int payload_length, bool skip) | |
591 | { | |
592 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
593 | int err = 0; |
594 | ||
595 | if (IS_ERR(s->context)) | |
596 | goto end; | |
4b7da117 TS |
597 | |
598 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
599 | p.tag = TAG_CIP; | |
600 | p.header_length = header_length; | |
601 | p.payload_length = (!skip) ? payload_length : 0; | |
602 | p.skip = skip; | |
603 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
604 | s->buffer.packets[s->packet_index].offset); | |
605 | if (err < 0) { | |
606 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
607 | goto end; | |
608 | } | |
609 | ||
610 | if (++s->packet_index >= QUEUE_LENGTH) | |
611 | s->packet_index = 0; | |
612 | end: | |
613 | return err; | |
614 | } | |
615 | ||
616 | static inline int queue_out_packet(struct amdtp_stream *s, | |
617 | unsigned int payload_length, bool skip) | |
618 | { | |
619 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
620 | payload_length, skip); | |
621 | } | |
622 | ||
2b3fc456 TS |
623 | static inline int queue_in_packet(struct amdtp_stream *s) |
624 | { | |
625 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
626 | amdtp_stream_get_max_payload(s), false); | |
627 | } | |
628 | ||
ccccad86 | 629 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
630 | { |
631 | __be32 *buffer; | |
ccccad86 | 632 | unsigned int data_blocks, payload_length; |
31ef9134 | 633 | struct snd_pcm_substream *pcm; |
31ef9134 | 634 | |
ec00f5e4 CL |
635 | if (s->packet_index < 0) |
636 | return; | |
ec00f5e4 | 637 | |
82755abf | 638 | /* this module generate empty packet for 'no data' */ |
ccccad86 | 639 | if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO)) |
e84d15f6 | 640 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
641 | else |
642 | data_blocks = 0; | |
31ef9134 | 643 | |
ccccad86 | 644 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 645 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 646 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
647 | s->data_block_counter); |
648 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 649 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
650 | buffer += 2; |
651 | ||
652 | pcm = ACCESS_ONCE(s->pcm); | |
653 | if (pcm) | |
654 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
655 | else | |
656 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
657 | if (s->midi_ports) | |
658 | amdtp_fill_midi(s, buffer, data_blocks); | |
659 | ||
660 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
661 | ||
4b7da117 TS |
662 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
663 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 664 | s->packet_index = -1; |
be4a2894 | 665 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
666 | return; |
667 | } | |
31ef9134 | 668 | |
76fb8789 | 669 | if (pcm) |
4b7da117 | 670 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
671 | } |
672 | ||
2b3fc456 TS |
673 | static void handle_in_packet(struct amdtp_stream *s, |
674 | unsigned int payload_quadlets, | |
675 | __be32 *buffer) | |
676 | { | |
677 | u32 cip_header[2]; | |
678 | unsigned int data_blocks, data_block_quadlets, data_block_counter; | |
679 | struct snd_pcm_substream *pcm = NULL; | |
680 | ||
681 | cip_header[0] = be32_to_cpu(buffer[0]); | |
682 | cip_header[1] = be32_to_cpu(buffer[1]); | |
683 | ||
684 | /* | |
685 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
686 | * For convinience, also check FMT field is AM824 or not. | |
687 | */ | |
688 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
689 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
690 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
691 | dev_info_ratelimited(&s->unit->device, | |
692 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
693 | cip_header[0], cip_header[1]); | |
694 | goto end; | |
695 | } | |
696 | ||
697 | /* Calculate data blocks */ | |
698 | if (payload_quadlets < 3 || | |
699 | ((cip_header[1] & CIP_FDF_MASK) == | |
700 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
701 | data_blocks = 0; | |
702 | } else { | |
703 | data_block_quadlets = | |
704 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
705 | /* avoid division by zero */ | |
706 | if (data_block_quadlets == 0) { | |
707 | dev_info_ratelimited(&s->unit->device, | |
708 | "Detect invalid value in dbs field: %08X\n", | |
709 | cip_header[0]); | |
710 | goto err; | |
711 | } | |
712 | ||
713 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
714 | } | |
715 | ||
716 | /* Check data block counter continuity */ | |
717 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
718 | if (data_block_counter != s->data_block_counter) { | |
719 | dev_info(&s->unit->device, | |
720 | "Detect discontinuity of CIP: %02X %02X\n", | |
721 | s->data_block_counter, data_block_counter); | |
722 | goto err; | |
723 | } | |
724 | ||
725 | if (data_blocks > 0) { | |
726 | buffer += 2; | |
727 | ||
728 | pcm = ACCESS_ONCE(s->pcm); | |
729 | if (pcm) | |
730 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
731 | |
732 | if (s->midi_ports) | |
733 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
734 | } |
735 | ||
736 | s->data_block_counter = (data_block_counter + data_blocks) & 0xff; | |
737 | end: | |
738 | if (queue_in_packet(s) < 0) | |
739 | goto err; | |
740 | ||
741 | if (pcm) | |
742 | update_pcm_pointers(s, pcm, data_blocks); | |
743 | ||
744 | return; | |
745 | err: | |
746 | s->packet_index = -1; | |
747 | amdtp_stream_pcm_abort(s); | |
748 | } | |
749 | ||
4b7da117 TS |
750 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
751 | size_t header_length, void *header, | |
752 | void *private_data) | |
31ef9134 | 753 | { |
be4a2894 | 754 | struct amdtp_stream *s = private_data; |
ccccad86 | 755 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
756 | |
757 | /* | |
758 | * Compute the cycle of the last queued packet. | |
759 | * (We need only the four lowest bits for the SYT, so we can ignore | |
760 | * that bits 0-11 must wrap around at 3072.) | |
761 | */ | |
762 | cycle += QUEUE_LENGTH - packets; | |
763 | ||
ccccad86 TS |
764 | for (i = 0; i < packets; ++i) { |
765 | syt = calculate_syt(s, ++cycle); | |
766 | handle_out_packet(s, syt); | |
767 | } | |
13882a82 | 768 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
769 | } |
770 | ||
2b3fc456 TS |
771 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
772 | size_t header_length, void *header, | |
773 | void *private_data) | |
774 | { | |
775 | struct amdtp_stream *s = private_data; | |
7b3b0d85 | 776 | unsigned int p, syt, packets, payload_quadlets; |
2b3fc456 TS |
777 | __be32 *buffer, *headers = header; |
778 | ||
779 | /* The number of packets in buffer */ | |
780 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
781 | ||
782 | for (p = 0; p < packets; p++) { | |
783 | if (s->packet_index < 0) | |
7b3b0d85 TS |
784 | break; |
785 | ||
2b3fc456 TS |
786 | buffer = s->buffer.packets[s->packet_index].buffer; |
787 | ||
7b3b0d85 TS |
788 | /* Process sync slave stream */ |
789 | if (s->sync_slave && s->sync_slave->callbacked) { | |
790 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
791 | handle_out_packet(s->sync_slave, syt); | |
792 | } | |
793 | ||
2b3fc456 TS |
794 | /* The number of quadlets in this packet */ |
795 | payload_quadlets = | |
796 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
797 | handle_in_packet(s, payload_quadlets, buffer); | |
798 | } | |
799 | ||
7b3b0d85 TS |
800 | /* Queueing error or detecting discontinuity */ |
801 | if (s->packet_index < 0) { | |
802 | /* Abort sync slave. */ | |
803 | if (s->sync_slave) { | |
804 | s->sync_slave->packet_index = -1; | |
805 | amdtp_stream_pcm_abort(s->sync_slave); | |
806 | } | |
807 | return; | |
808 | } | |
809 | ||
810 | /* when sync to device, flush the packets for slave stream */ | |
811 | if (s->sync_slave && s->sync_slave->callbacked) | |
812 | fw_iso_context_queue_flush(s->sync_slave->context); | |
813 | ||
2b3fc456 TS |
814 | fw_iso_context_queue_flush(s->context); |
815 | } | |
816 | ||
7b3b0d85 TS |
817 | /* processing is done by master callback */ |
818 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
819 | size_t header_length, void *header, | |
820 | void *private_data) | |
821 | { | |
822 | return; | |
823 | } | |
824 | ||
825 | /* this is executed one time */ | |
826 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
827 | u32 cycle, size_t header_length, | |
828 | void *header, void *private_data) | |
829 | { | |
830 | struct amdtp_stream *s = private_data; | |
831 | ||
832 | /* | |
833 | * For in-stream, first packet has come. | |
834 | * For out-stream, prepared to transmit first packet | |
835 | */ | |
836 | s->callbacked = true; | |
837 | wake_up(&s->callback_wait); | |
838 | ||
839 | if (s->direction == AMDTP_IN_STREAM) | |
840 | context->callback.sc = in_stream_callback; | |
841 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
842 | context->callback.sc = slave_stream_callback; | |
843 | else | |
844 | context->callback.sc = out_stream_callback; | |
845 | ||
846 | context->callback.sc(context, cycle, header_length, header, s); | |
847 | } | |
848 | ||
31ef9134 | 849 | /** |
be4a2894 TS |
850 | * amdtp_stream_start - start transferring packets |
851 | * @s: the AMDTP stream to start | |
31ef9134 CL |
852 | * @channel: the isochronous channel on the bus |
853 | * @speed: firewire speed code | |
854 | * | |
855 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
856 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
857 | * device can be started. | |
31ef9134 | 858 | */ |
be4a2894 | 859 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
860 | { |
861 | static const struct { | |
862 | unsigned int data_block; | |
863 | unsigned int syt_offset; | |
864 | } initial_state[] = { | |
865 | [CIP_SFC_32000] = { 4, 3072 }, | |
866 | [CIP_SFC_48000] = { 6, 1024 }, | |
867 | [CIP_SFC_96000] = { 12, 1024 }, | |
868 | [CIP_SFC_192000] = { 24, 1024 }, | |
869 | [CIP_SFC_44100] = { 0, 67 }, | |
870 | [CIP_SFC_88200] = { 0, 67 }, | |
871 | [CIP_SFC_176400] = { 0, 67 }, | |
872 | }; | |
2b3fc456 TS |
873 | unsigned int header_size; |
874 | enum dma_data_direction dir; | |
2b3fc456 | 875 | int type, err; |
31ef9134 CL |
876 | |
877 | mutex_lock(&s->mutex); | |
878 | ||
be4a2894 | 879 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 880 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
881 | err = -EBADFD; |
882 | goto err_unlock; | |
883 | } | |
884 | ||
4b7da117 | 885 | s->data_block_counter = 0; |
31ef9134 CL |
886 | s->data_block_state = initial_state[s->sfc].data_block; |
887 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
888 | s->last_syt_offset = TICKS_PER_CYCLE; | |
889 | ||
2b3fc456 TS |
890 | /* initialize packet buffer */ |
891 | if (s->direction == AMDTP_IN_STREAM) { | |
892 | dir = DMA_FROM_DEVICE; | |
893 | type = FW_ISO_CONTEXT_RECEIVE; | |
894 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
895 | } else { |
896 | dir = DMA_TO_DEVICE; | |
897 | type = FW_ISO_CONTEXT_TRANSMIT; | |
898 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 899 | } |
31ef9134 | 900 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 901 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
902 | if (err < 0) |
903 | goto err_unlock; | |
904 | ||
905 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 906 | type, channel, speed, header_size, |
7b3b0d85 | 907 | amdtp_stream_first_callback, s); |
31ef9134 CL |
908 | if (IS_ERR(s->context)) { |
909 | err = PTR_ERR(s->context); | |
910 | if (err == -EBUSY) | |
911 | dev_err(&s->unit->device, | |
be4a2894 | 912 | "no free stream on this controller\n"); |
31ef9134 CL |
913 | goto err_buffer; |
914 | } | |
915 | ||
be4a2894 | 916 | amdtp_stream_update(s); |
31ef9134 | 917 | |
ec00f5e4 | 918 | s->packet_index = 0; |
4b7da117 | 919 | do { |
2b3fc456 TS |
920 | if (s->direction == AMDTP_IN_STREAM) |
921 | err = queue_in_packet(s); | |
922 | else | |
923 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
924 | if (err < 0) |
925 | goto err_context; | |
926 | } while (s->packet_index > 0); | |
31ef9134 | 927 | |
2b3fc456 | 928 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7b3b0d85 | 929 | s->callbacked = false; |
2b3fc456 TS |
930 | err = fw_iso_context_start(s->context, -1, 0, |
931 | FW_ISO_CONTEXT_MATCH_TAG1); | |
31ef9134 CL |
932 | if (err < 0) |
933 | goto err_context; | |
934 | ||
935 | mutex_unlock(&s->mutex); | |
936 | ||
937 | return 0; | |
938 | ||
939 | err_context: | |
940 | fw_iso_context_destroy(s->context); | |
941 | s->context = ERR_PTR(-1); | |
942 | err_buffer: | |
943 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
944 | err_unlock: | |
945 | mutex_unlock(&s->mutex); | |
946 | ||
947 | return err; | |
948 | } | |
be4a2894 | 949 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 950 | |
e9148ddd | 951 | /** |
be4a2894 TS |
952 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
953 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
954 | * |
955 | * Returns the current buffer position, in frames. | |
956 | */ | |
be4a2894 | 957 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 958 | { |
92b862c7 CL |
959 | /* this optimization is allowed to be racy */ |
960 | if (s->pointer_flush) | |
961 | fw_iso_context_flush_completions(s->context); | |
962 | else | |
963 | s->pointer_flush = true; | |
e9148ddd CL |
964 | |
965 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
966 | } | |
be4a2894 | 967 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 968 | |
31ef9134 | 969 | /** |
be4a2894 TS |
970 | * amdtp_stream_update - update the stream after a bus reset |
971 | * @s: the AMDTP stream | |
31ef9134 | 972 | */ |
be4a2894 | 973 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
974 | { |
975 | ACCESS_ONCE(s->source_node_id_field) = | |
976 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
977 | } | |
be4a2894 | 978 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
979 | |
980 | /** | |
be4a2894 TS |
981 | * amdtp_stream_stop - stop sending packets |
982 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
983 | * |
984 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
985 | * itself can be stopped. | |
986 | */ | |
be4a2894 | 987 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
988 | { |
989 | mutex_lock(&s->mutex); | |
990 | ||
be4a2894 | 991 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
992 | mutex_unlock(&s->mutex); |
993 | return; | |
994 | } | |
995 | ||
76fb8789 | 996 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
997 | fw_iso_context_stop(s->context); |
998 | fw_iso_context_destroy(s->context); | |
999 | s->context = ERR_PTR(-1); | |
1000 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
1001 | ||
7b3b0d85 TS |
1002 | s->callbacked = false; |
1003 | ||
31ef9134 CL |
1004 | mutex_unlock(&s->mutex); |
1005 | } | |
be4a2894 | 1006 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
1007 | |
1008 | /** | |
be4a2894 | 1009 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
1010 | * @s: the AMDTP stream about to be stopped |
1011 | * | |
1012 | * If the isochronous stream needs to be stopped asynchronously, call this | |
1013 | * function first to stop the PCM device. | |
1014 | */ | |
be4a2894 | 1015 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
1016 | { |
1017 | struct snd_pcm_substream *pcm; | |
1018 | ||
1019 | pcm = ACCESS_ONCE(s->pcm); | |
1020 | if (pcm) { | |
1021 | snd_pcm_stream_lock_irq(pcm); | |
1022 | if (snd_pcm_running(pcm)) | |
1023 | snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); | |
1024 | snd_pcm_stream_unlock_irq(pcm); | |
1025 | } | |
1026 | } | |
be4a2894 | 1027 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |