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 | ||
5c697e5b CL |
24 | /* |
25 | * Several devices look only at the first eight data blocks. | |
26 | * In any case, this is more than enough for the MIDI data rate. | |
27 | */ | |
28 | #define MAX_MIDI_RX_BLOCKS 8 | |
29 | ||
30 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ | |
31ef9134 | 31 | |
b445db44 TS |
32 | /* isochronous header parameters */ |
33 | #define ISO_DATA_LENGTH_SHIFT 16 | |
31ef9134 CL |
34 | #define TAG_CIP 1 |
35 | ||
b445db44 | 36 | /* common isochronous packet header parameters */ |
31ef9134 | 37 | #define CIP_EOH (1u << 31) |
b445db44 | 38 | #define CIP_EOH_MASK 0x80000000 |
31ef9134 | 39 | #define CIP_FMT_AM (0x10 << 24) |
b445db44 TS |
40 | #define CIP_FMT_MASK 0x3f000000 |
41 | #define CIP_SYT_MASK 0x0000ffff | |
42 | #define CIP_SYT_NO_INFO 0xffff | |
43 | #define CIP_FDF_MASK 0x00ff0000 | |
44 | #define CIP_FDF_SFC_SHIFT 16 | |
45 | ||
46 | /* | |
47 | * Audio and Music transfer protocol specific parameters | |
48 | * only "Clock-based rate control mode" is supported | |
49 | */ | |
50 | #define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3)) | |
2b3fc456 | 51 | #define AMDTP_FDF_NO_DATA 0xff |
b445db44 TS |
52 | #define AMDTP_DBS_MASK 0x00ff0000 |
53 | #define AMDTP_DBS_SHIFT 16 | |
54 | #define AMDTP_DBC_MASK 0x000000ff | |
31ef9134 CL |
55 | |
56 | /* TODO: make these configurable */ | |
57 | #define INTERRUPT_INTERVAL 16 | |
58 | #define QUEUE_LENGTH 48 | |
59 | ||
2b3fc456 | 60 | #define IN_PACKET_HEADER_SIZE 4 |
4b7da117 TS |
61 | #define OUT_PACKET_HEADER_SIZE 0 |
62 | ||
76fb8789 CL |
63 | static void pcm_period_tasklet(unsigned long data); |
64 | ||
31ef9134 | 65 | /** |
be4a2894 TS |
66 | * amdtp_stream_init - initialize an AMDTP stream structure |
67 | * @s: the AMDTP stream to initialize | |
31ef9134 | 68 | * @unit: the target of the stream |
3ff7e8f0 | 69 | * @dir: the direction of stream |
31ef9134 CL |
70 | * @flags: the packet transmission method to use |
71 | */ | |
be4a2894 | 72 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
3ff7e8f0 | 73 | enum amdtp_stream_direction dir, enum cip_flags flags) |
31ef9134 | 74 | { |
31ef9134 | 75 | s->unit = fw_unit_get(unit); |
3ff7e8f0 | 76 | s->direction = dir; |
31ef9134 CL |
77 | s->flags = flags; |
78 | s->context = ERR_PTR(-1); | |
79 | mutex_init(&s->mutex); | |
76fb8789 | 80 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 81 | s->packet_index = 0; |
31ef9134 | 82 | |
7b3b0d85 TS |
83 | init_waitqueue_head(&s->callback_wait); |
84 | s->callbacked = false; | |
85 | s->sync_slave = NULL; | |
86 | ||
31ef9134 CL |
87 | return 0; |
88 | } | |
be4a2894 | 89 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
90 | |
91 | /** | |
be4a2894 TS |
92 | * amdtp_stream_destroy - free stream resources |
93 | * @s: the AMDTP stream to destroy | |
31ef9134 | 94 | */ |
be4a2894 | 95 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 96 | { |
be4a2894 | 97 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
98 | mutex_destroy(&s->mutex); |
99 | fw_unit_put(s->unit); | |
100 | } | |
be4a2894 | 101 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 102 | |
c5280e99 | 103 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
104 | [CIP_SFC_32000] = 8, |
105 | [CIP_SFC_44100] = 8, | |
106 | [CIP_SFC_48000] = 8, | |
107 | [CIP_SFC_88200] = 16, | |
108 | [CIP_SFC_96000] = 16, | |
109 | [CIP_SFC_176400] = 32, | |
110 | [CIP_SFC_192000] = 32, | |
111 | }; | |
112 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
113 | ||
f9503a68 | 114 | const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = { |
1017abed TS |
115 | [CIP_SFC_32000] = 32000, |
116 | [CIP_SFC_44100] = 44100, | |
117 | [CIP_SFC_48000] = 48000, | |
118 | [CIP_SFC_88200] = 88200, | |
119 | [CIP_SFC_96000] = 96000, | |
120 | [CIP_SFC_176400] = 176400, | |
121 | [CIP_SFC_192000] = 192000, | |
122 | }; | |
123 | EXPORT_SYMBOL(amdtp_rate_table); | |
124 | ||
7b2d99fa TS |
125 | /** |
126 | * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream | |
127 | * @s: the AMDTP stream, which must be initialized. | |
128 | * @runtime: the PCM substream runtime | |
129 | */ | |
130 | int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, | |
131 | struct snd_pcm_runtime *runtime) | |
132 | { | |
133 | int err; | |
134 | ||
135 | /* AM824 in IEC 61883-6 can deliver 24bit data */ | |
136 | err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); | |
137 | if (err < 0) | |
138 | goto end; | |
139 | ||
140 | /* | |
141 | * Currently firewire-lib processes 16 packets in one software | |
142 | * interrupt callback. This equals to 2msec but actually the | |
143 | * interval of the interrupts has a jitter. | |
144 | * Additionally, even if adding a constraint to fit period size to | |
145 | * 2msec, actual calculated frames per period doesn't equal to 2msec, | |
146 | * depending on sampling rate. | |
147 | * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec. | |
148 | * Here let us use 5msec for safe period interrupt. | |
149 | */ | |
150 | err = snd_pcm_hw_constraint_minmax(runtime, | |
151 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
152 | 5000, UINT_MAX); | |
153 | if (err < 0) | |
154 | goto end; | |
155 | ||
156 | /* Non-Blocking stream has no more constraints */ | |
157 | if (!(s->flags & CIP_BLOCKING)) | |
158 | goto end; | |
159 | ||
160 | /* | |
161 | * One AMDTP packet can include some frames. In blocking mode, the | |
162 | * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, | |
163 | * depending on its sampling rate. For accurate period interrupt, it's | |
164 | * preferrable to aligh period/buffer sizes to current SYT_INTERVAL. | |
165 | * | |
166 | * TODO: These constraints can be improved with propper rules. | |
167 | * Currently apply LCM of SYT_INTEVALs. | |
168 | */ | |
169 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
170 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32); | |
171 | if (err < 0) | |
172 | goto end; | |
173 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
174 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32); | |
175 | end: | |
176 | return err; | |
177 | } | |
178 | EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); | |
179 | ||
31ef9134 | 180 | /** |
be4a2894 TS |
181 | * amdtp_stream_set_parameters - set stream parameters |
182 | * @s: the AMDTP stream to configure | |
31ef9134 | 183 | * @rate: the sample rate |
a7304e3b CL |
184 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
185 | * as AM824 multi-bit linear audio | |
186 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 187 | * |
a7304e3b | 188 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
189 | * changed while the stream is running. |
190 | */ | |
be4a2894 TS |
191 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
192 | unsigned int rate, | |
193 | unsigned int pcm_channels, | |
194 | unsigned int midi_ports) | |
31ef9134 | 195 | { |
77d2a8a4 | 196 | unsigned int i, sfc, midi_channels; |
31ef9134 | 197 | |
83d8d72d TS |
198 | midi_channels = DIV_ROUND_UP(midi_ports, 8); |
199 | ||
77d2a8a4 TS |
200 | if (WARN_ON(amdtp_stream_running(s)) | |
201 | WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) | | |
83d8d72d | 202 | WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI)) |
31ef9134 CL |
203 | return; |
204 | ||
f9503a68 | 205 | for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) |
1017abed | 206 | if (amdtp_rate_table[sfc] == rate) |
e84d15f6 | 207 | goto sfc_found; |
31ef9134 | 208 | WARN_ON(1); |
e84d15f6 CL |
209 | return; |
210 | ||
211 | sfc_found: | |
10550bea | 212 | s->pcm_channels = pcm_channels; |
e84d15f6 | 213 | s->sfc = sfc; |
77d2a8a4 | 214 | s->data_block_quadlets = s->pcm_channels + midi_channels; |
a7304e3b CL |
215 | s->midi_ports = midi_ports; |
216 | ||
217 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
218 | |
219 | /* default buffering in the device */ | |
220 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
221 | if (s->flags & CIP_BLOCKING) | |
222 | /* additional buffering needed to adjust for no-data packets */ | |
223 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
77d2a8a4 TS |
224 | |
225 | /* init the position map for PCM and MIDI channels */ | |
226 | for (i = 0; i < pcm_channels; i++) | |
227 | s->pcm_positions[i] = i; | |
228 | s->midi_position = s->pcm_channels; | |
31ef9134 | 229 | } |
be4a2894 | 230 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
231 | |
232 | /** | |
be4a2894 TS |
233 | * amdtp_stream_get_max_payload - get the stream's packet size |
234 | * @s: the AMDTP stream | |
31ef9134 CL |
235 | * |
236 | * This function must not be called before the stream has been configured | |
be4a2894 | 237 | * with amdtp_stream_set_parameters(). |
31ef9134 | 238 | */ |
be4a2894 | 239 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 240 | { |
e84d15f6 | 241 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 242 | } |
be4a2894 | 243 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 244 | |
be4a2894 | 245 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
246 | struct snd_pcm_substream *pcm, |
247 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 248 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
249 | struct snd_pcm_substream *pcm, |
250 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
251 | static void amdtp_read_s32(struct amdtp_stream *s, |
252 | struct snd_pcm_substream *pcm, | |
253 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
254 | |
255 | /** | |
be4a2894 TS |
256 | * amdtp_stream_set_pcm_format - set the PCM format |
257 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
258 | * @format: the format of the ALSA PCM device |
259 | * | |
a7304e3b CL |
260 | * The sample format must be set after the other paramters (rate/PCM channels/ |
261 | * MIDI) and before the stream is started, and must not be changed while the | |
262 | * stream is running. | |
31ef9134 | 263 | */ |
be4a2894 TS |
264 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
265 | snd_pcm_format_t format) | |
31ef9134 | 266 | { |
83d8d72d | 267 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
268 | return; |
269 | ||
270 | switch (format) { | |
271 | default: | |
272 | WARN_ON(1); | |
273 | /* fall through */ | |
274 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 | 275 | if (s->direction == AMDTP_OUT_STREAM) { |
10550bea | 276 | s->transfer_samples = amdtp_write_s16; |
2b3fc456 TS |
277 | break; |
278 | } | |
279 | WARN_ON(1); | |
280 | /* fall through */ | |
31ef9134 | 281 | case SNDRV_PCM_FORMAT_S32: |
10550bea TS |
282 | if (s->direction == AMDTP_OUT_STREAM) |
283 | s->transfer_samples = amdtp_write_s32; | |
284 | else | |
285 | s->transfer_samples = amdtp_read_s32; | |
31ef9134 CL |
286 | break; |
287 | } | |
288 | } | |
be4a2894 | 289 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 290 | |
76fb8789 | 291 | /** |
be4a2894 TS |
292 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
293 | * @s: the AMDTP stream | |
76fb8789 CL |
294 | * |
295 | * This function should be called from the PCM device's .prepare callback. | |
296 | */ | |
be4a2894 | 297 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
298 | { |
299 | tasklet_kill(&s->period_tasklet); | |
300 | s->pcm_buffer_pointer = 0; | |
301 | s->pcm_period_pointer = 0; | |
92b862c7 | 302 | s->pointer_flush = true; |
76fb8789 | 303 | } |
be4a2894 | 304 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 305 | |
be4a2894 | 306 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
307 | { |
308 | unsigned int phase, data_blocks; | |
309 | ||
ccccad86 TS |
310 | if (s->flags & CIP_BLOCKING) |
311 | data_blocks = s->syt_interval; | |
312 | else if (!cip_sfc_is_base_44100(s->sfc)) { | |
31ef9134 CL |
313 | /* Sample_rate / 8000 is an integer, and precomputed. */ |
314 | data_blocks = s->data_block_state; | |
315 | } else { | |
316 | phase = s->data_block_state; | |
317 | ||
318 | /* | |
319 | * This calculates the number of data blocks per packet so that | |
320 | * 1) the overall rate is correct and exactly synchronized to | |
321 | * the bus clock, and | |
322 | * 2) packets with a rounded-up number of blocks occur as early | |
323 | * as possible in the sequence (to prevent underruns of the | |
324 | * device's buffer). | |
325 | */ | |
326 | if (s->sfc == CIP_SFC_44100) | |
327 | /* 6 6 5 6 5 6 5 ... */ | |
328 | data_blocks = 5 + ((phase & 1) ^ | |
329 | (phase == 0 || phase >= 40)); | |
330 | else | |
331 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
332 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
333 | if (++phase >= (80 >> (s->sfc >> 1))) | |
334 | phase = 0; | |
335 | s->data_block_state = phase; | |
336 | } | |
337 | ||
338 | return data_blocks; | |
339 | } | |
340 | ||
be4a2894 | 341 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
342 | unsigned int cycle) |
343 | { | |
344 | unsigned int syt_offset, phase, index, syt; | |
345 | ||
346 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
347 | if (!cip_sfc_is_base_44100(s->sfc)) | |
348 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
349 | else { | |
350 | /* | |
351 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
352 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
353 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
354 | * elements is about 1386.23. Rounding the results of this | |
355 | * formula to the SYT precision results in a sequence of | |
356 | * differences that begins with: | |
357 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
358 | * This code generates _exactly_ the same sequence. | |
359 | */ | |
360 | phase = s->syt_offset_state; | |
361 | index = phase % 13; | |
362 | syt_offset = s->last_syt_offset; | |
363 | syt_offset += 1386 + ((index && !(index & 3)) || | |
364 | phase == 146); | |
365 | if (++phase >= 147) | |
366 | phase = 0; | |
367 | s->syt_offset_state = phase; | |
368 | } | |
369 | } else | |
370 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
371 | s->last_syt_offset = syt_offset; | |
372 | ||
be454366 | 373 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 374 | syt_offset += s->transfer_delay; |
be454366 CL |
375 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
376 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 377 | |
b445db44 | 378 | return syt & CIP_SYT_MASK; |
be454366 | 379 | } else { |
b445db44 | 380 | return CIP_SYT_NO_INFO; |
be454366 | 381 | } |
31ef9134 CL |
382 | } |
383 | ||
be4a2894 | 384 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
385 | struct snd_pcm_substream *pcm, |
386 | __be32 *buffer, unsigned int frames) | |
387 | { | |
388 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 389 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
390 | const u32 *src; |
391 | ||
392 | channels = s->pcm_channels; | |
393 | src = (void *)runtime->dma_area + | |
e84841f9 | 394 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 395 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
396 | |
397 | for (i = 0; i < frames; ++i) { | |
398 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
399 | buffer[s->pcm_positions[c]] = |
400 | cpu_to_be32((*src >> 8) | 0x40000000); | |
31ef9134 | 401 | src++; |
31ef9134 | 402 | } |
77d2a8a4 | 403 | buffer += s->data_block_quadlets; |
31ef9134 CL |
404 | if (--remaining_frames == 0) |
405 | src = (void *)runtime->dma_area; | |
406 | } | |
407 | } | |
408 | ||
be4a2894 | 409 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
410 | struct snd_pcm_substream *pcm, |
411 | __be32 *buffer, unsigned int frames) | |
412 | { | |
413 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 414 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
415 | const u16 *src; |
416 | ||
417 | channels = s->pcm_channels; | |
418 | src = (void *)runtime->dma_area + | |
e84841f9 | 419 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 420 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
421 | |
422 | for (i = 0; i < frames; ++i) { | |
423 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 424 | buffer[s->pcm_positions[c]] = |
a6975f2a | 425 | cpu_to_be32((*src << 8) | 0x42000000); |
31ef9134 | 426 | src++; |
31ef9134 | 427 | } |
77d2a8a4 | 428 | buffer += s->data_block_quadlets; |
31ef9134 CL |
429 | if (--remaining_frames == 0) |
430 | src = (void *)runtime->dma_area; | |
431 | } | |
432 | } | |
433 | ||
2b3fc456 TS |
434 | static void amdtp_read_s32(struct amdtp_stream *s, |
435 | struct snd_pcm_substream *pcm, | |
436 | __be32 *buffer, unsigned int frames) | |
437 | { | |
438 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
439 | unsigned int channels, remaining_frames, i, c; | |
440 | u32 *dst; | |
441 | ||
442 | channels = s->pcm_channels; | |
443 | dst = (void *)runtime->dma_area + | |
444 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
445 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
446 | ||
447 | for (i = 0; i < frames; ++i) { | |
448 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 449 | *dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8; |
2b3fc456 TS |
450 | dst++; |
451 | } | |
452 | buffer += s->data_block_quadlets; | |
453 | if (--remaining_frames == 0) | |
454 | dst = (void *)runtime->dma_area; | |
455 | } | |
456 | } | |
457 | ||
be4a2894 | 458 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
459 | __be32 *buffer, unsigned int frames) |
460 | { | |
461 | unsigned int i, c; | |
462 | ||
463 | for (i = 0; i < frames; ++i) { | |
464 | for (c = 0; c < s->pcm_channels; ++c) | |
77d2a8a4 | 465 | buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000); |
31ef9134 CL |
466 | buffer += s->data_block_quadlets; |
467 | } | |
468 | } | |
469 | ||
be4a2894 | 470 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
471 | __be32 *buffer, unsigned int frames) |
472 | { | |
83d8d72d TS |
473 | unsigned int f, port; |
474 | u8 *b; | |
475 | ||
476 | for (f = 0; f < frames; f++) { | |
77d2a8a4 TS |
477 | buffer[s->midi_position] = 0; |
478 | b = (u8 *)&buffer[s->midi_position]; | |
83d8d72d TS |
479 | |
480 | port = (s->data_block_counter + f) % 8; | |
5c697e5b | 481 | if ((f >= MAX_MIDI_RX_BLOCKS) || |
53111cdc | 482 | (s->midi[port] == NULL) || |
83d8d72d TS |
483 | (snd_rawmidi_transmit(s->midi[port], b + 1, 1) <= 0)) |
484 | b[0] = 0x80; | |
485 | else | |
486 | b[0] = 0x81; | |
487 | ||
488 | buffer += s->data_block_quadlets; | |
489 | } | |
490 | } | |
491 | ||
492 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
493 | __be32 *buffer, unsigned int frames) | |
494 | { | |
495 | unsigned int f, port; | |
496 | int len; | |
497 | u8 *b; | |
498 | ||
499 | for (f = 0; f < frames; f++) { | |
500 | port = (s->data_block_counter + f) % 8; | |
77d2a8a4 | 501 | b = (u8 *)&buffer[s->midi_position]; |
31ef9134 | 502 | |
83d8d72d TS |
503 | len = b[0] - 0x80; |
504 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
505 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
506 | ||
507 | buffer += s->data_block_quadlets; | |
508 | } | |
31ef9134 CL |
509 | } |
510 | ||
4b7da117 TS |
511 | static void update_pcm_pointers(struct amdtp_stream *s, |
512 | struct snd_pcm_substream *pcm, | |
513 | unsigned int frames) | |
65845f29 TS |
514 | { |
515 | unsigned int ptr; | |
516 | ||
517 | /* | |
518 | * In IEC 61883-6, one data block represents one event. In ALSA, one | |
519 | * event equals to one PCM frame. But Dice has a quirk to transfer | |
520 | * two PCM frames in one data block. | |
521 | */ | |
522 | if (s->double_pcm_frames) | |
523 | frames *= 2; | |
4b7da117 | 524 | |
4b7da117 TS |
525 | ptr = s->pcm_buffer_pointer + frames; |
526 | if (ptr >= pcm->runtime->buffer_size) | |
527 | ptr -= pcm->runtime->buffer_size; | |
528 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
529 | ||
530 | s->pcm_period_pointer += frames; | |
531 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
532 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
533 | s->pointer_flush = false; | |
534 | tasklet_hi_schedule(&s->period_tasklet); | |
535 | } | |
536 | } | |
537 | ||
538 | static void pcm_period_tasklet(unsigned long data) | |
539 | { | |
540 | struct amdtp_stream *s = (void *)data; | |
541 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
542 | ||
543 | if (pcm) | |
544 | snd_pcm_period_elapsed(pcm); | |
545 | } | |
546 | ||
547 | static int queue_packet(struct amdtp_stream *s, | |
548 | unsigned int header_length, | |
549 | unsigned int payload_length, bool skip) | |
550 | { | |
551 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
552 | int err = 0; |
553 | ||
554 | if (IS_ERR(s->context)) | |
555 | goto end; | |
4b7da117 TS |
556 | |
557 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
558 | p.tag = TAG_CIP; | |
559 | p.header_length = header_length; | |
560 | p.payload_length = (!skip) ? payload_length : 0; | |
561 | p.skip = skip; | |
562 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
563 | s->buffer.packets[s->packet_index].offset); | |
564 | if (err < 0) { | |
565 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
566 | goto end; | |
567 | } | |
568 | ||
569 | if (++s->packet_index >= QUEUE_LENGTH) | |
570 | s->packet_index = 0; | |
571 | end: | |
572 | return err; | |
573 | } | |
574 | ||
575 | static inline int queue_out_packet(struct amdtp_stream *s, | |
576 | unsigned int payload_length, bool skip) | |
577 | { | |
578 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
579 | payload_length, skip); | |
580 | } | |
581 | ||
2b3fc456 TS |
582 | static inline int queue_in_packet(struct amdtp_stream *s) |
583 | { | |
584 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
585 | amdtp_stream_get_max_payload(s), false); | |
586 | } | |
587 | ||
ccccad86 | 588 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
589 | { |
590 | __be32 *buffer; | |
ccccad86 | 591 | unsigned int data_blocks, payload_length; |
31ef9134 | 592 | struct snd_pcm_substream *pcm; |
31ef9134 | 593 | |
ec00f5e4 CL |
594 | if (s->packet_index < 0) |
595 | return; | |
ec00f5e4 | 596 | |
82755abf | 597 | /* this module generate empty packet for 'no data' */ |
ccccad86 | 598 | if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO)) |
e84d15f6 | 599 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
600 | else |
601 | data_blocks = 0; | |
31ef9134 | 602 | |
ccccad86 | 603 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 604 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 605 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
606 | s->data_block_counter); |
607 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 608 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
609 | buffer += 2; |
610 | ||
611 | pcm = ACCESS_ONCE(s->pcm); | |
612 | if (pcm) | |
613 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
614 | else | |
615 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
616 | if (s->midi_ports) | |
617 | amdtp_fill_midi(s, buffer, data_blocks); | |
618 | ||
619 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
620 | ||
4b7da117 TS |
621 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
622 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 623 | s->packet_index = -1; |
be4a2894 | 624 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
625 | return; |
626 | } | |
31ef9134 | 627 | |
76fb8789 | 628 | if (pcm) |
4b7da117 | 629 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
630 | } |
631 | ||
2b3fc456 TS |
632 | static void handle_in_packet(struct amdtp_stream *s, |
633 | unsigned int payload_quadlets, | |
634 | __be32 *buffer) | |
635 | { | |
636 | u32 cip_header[2]; | |
d9cd0065 TS |
637 | unsigned int data_blocks, data_block_quadlets, data_block_counter, |
638 | dbc_interval; | |
2b3fc456 | 639 | struct snd_pcm_substream *pcm = NULL; |
c8bdf49b | 640 | bool lost; |
2b3fc456 TS |
641 | |
642 | cip_header[0] = be32_to_cpu(buffer[0]); | |
643 | cip_header[1] = be32_to_cpu(buffer[1]); | |
644 | ||
645 | /* | |
646 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 647 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 TS |
648 | */ |
649 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
650 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
651 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
652 | dev_info_ratelimited(&s->unit->device, | |
653 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
654 | cip_header[0], cip_header[1]); | |
655 | goto end; | |
656 | } | |
657 | ||
658 | /* Calculate data blocks */ | |
659 | if (payload_quadlets < 3 || | |
660 | ((cip_header[1] & CIP_FDF_MASK) == | |
661 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
662 | data_blocks = 0; | |
663 | } else { | |
664 | data_block_quadlets = | |
665 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
666 | /* avoid division by zero */ | |
667 | if (data_block_quadlets == 0) { | |
668 | dev_info_ratelimited(&s->unit->device, | |
669 | "Detect invalid value in dbs field: %08X\n", | |
670 | cip_header[0]); | |
671 | goto err; | |
672 | } | |
69702239 TS |
673 | if (s->flags & CIP_WRONG_DBS) |
674 | data_block_quadlets = s->data_block_quadlets; | |
2b3fc456 TS |
675 | |
676 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
677 | } | |
678 | ||
679 | /* Check data block counter continuity */ | |
680 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
9d59124c TS |
681 | if (data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && |
682 | s->data_block_counter != UINT_MAX) | |
683 | data_block_counter = s->data_block_counter; | |
684 | ||
b6bc8123 TS |
685 | if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) && data_block_counter == 0) || |
686 | (s->data_block_counter == UINT_MAX)) { | |
b84b1a27 TS |
687 | lost = false; |
688 | } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { | |
c8bdf49b | 689 | lost = data_block_counter != s->data_block_counter; |
d9cd0065 TS |
690 | } else { |
691 | if ((data_blocks > 0) && (s->tx_dbc_interval > 0)) | |
692 | dbc_interval = s->tx_dbc_interval; | |
693 | else | |
694 | dbc_interval = data_blocks; | |
695 | ||
c8bdf49b | 696 | lost = data_block_counter != |
d9cd0065 TS |
697 | ((s->data_block_counter + dbc_interval) & 0xff); |
698 | } | |
c8bdf49b TS |
699 | |
700 | if (lost) { | |
2b3fc456 TS |
701 | dev_info(&s->unit->device, |
702 | "Detect discontinuity of CIP: %02X %02X\n", | |
703 | s->data_block_counter, data_block_counter); | |
704 | goto err; | |
705 | } | |
706 | ||
707 | if (data_blocks > 0) { | |
708 | buffer += 2; | |
709 | ||
710 | pcm = ACCESS_ONCE(s->pcm); | |
711 | if (pcm) | |
712 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
713 | |
714 | if (s->midi_ports) | |
715 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
716 | } |
717 | ||
c8bdf49b TS |
718 | if (s->flags & CIP_DBC_IS_END_EVENT) |
719 | s->data_block_counter = data_block_counter; | |
720 | else | |
721 | s->data_block_counter = | |
722 | (data_block_counter + data_blocks) & 0xff; | |
2b3fc456 TS |
723 | end: |
724 | if (queue_in_packet(s) < 0) | |
725 | goto err; | |
726 | ||
727 | if (pcm) | |
728 | update_pcm_pointers(s, pcm, data_blocks); | |
729 | ||
730 | return; | |
731 | err: | |
732 | s->packet_index = -1; | |
733 | amdtp_stream_pcm_abort(s); | |
734 | } | |
735 | ||
4b7da117 TS |
736 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
737 | size_t header_length, void *header, | |
738 | void *private_data) | |
31ef9134 | 739 | { |
be4a2894 | 740 | struct amdtp_stream *s = private_data; |
ccccad86 | 741 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
742 | |
743 | /* | |
744 | * Compute the cycle of the last queued packet. | |
745 | * (We need only the four lowest bits for the SYT, so we can ignore | |
746 | * that bits 0-11 must wrap around at 3072.) | |
747 | */ | |
748 | cycle += QUEUE_LENGTH - packets; | |
749 | ||
ccccad86 TS |
750 | for (i = 0; i < packets; ++i) { |
751 | syt = calculate_syt(s, ++cycle); | |
752 | handle_out_packet(s, syt); | |
753 | } | |
13882a82 | 754 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
755 | } |
756 | ||
2b3fc456 TS |
757 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
758 | size_t header_length, void *header, | |
759 | void *private_data) | |
760 | { | |
761 | struct amdtp_stream *s = private_data; | |
7b3b0d85 | 762 | unsigned int p, syt, packets, payload_quadlets; |
2b3fc456 TS |
763 | __be32 *buffer, *headers = header; |
764 | ||
765 | /* The number of packets in buffer */ | |
766 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
767 | ||
768 | for (p = 0; p < packets; p++) { | |
769 | if (s->packet_index < 0) | |
7b3b0d85 TS |
770 | break; |
771 | ||
2b3fc456 TS |
772 | buffer = s->buffer.packets[s->packet_index].buffer; |
773 | ||
7b3b0d85 TS |
774 | /* Process sync slave stream */ |
775 | if (s->sync_slave && s->sync_slave->callbacked) { | |
776 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
777 | handle_out_packet(s->sync_slave, syt); | |
778 | } | |
779 | ||
2b3fc456 TS |
780 | /* The number of quadlets in this packet */ |
781 | payload_quadlets = | |
782 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
783 | handle_in_packet(s, payload_quadlets, buffer); | |
784 | } | |
785 | ||
7b3b0d85 TS |
786 | /* Queueing error or detecting discontinuity */ |
787 | if (s->packet_index < 0) { | |
788 | /* Abort sync slave. */ | |
789 | if (s->sync_slave) { | |
790 | s->sync_slave->packet_index = -1; | |
791 | amdtp_stream_pcm_abort(s->sync_slave); | |
792 | } | |
793 | return; | |
794 | } | |
795 | ||
796 | /* when sync to device, flush the packets for slave stream */ | |
797 | if (s->sync_slave && s->sync_slave->callbacked) | |
798 | fw_iso_context_queue_flush(s->sync_slave->context); | |
799 | ||
2b3fc456 TS |
800 | fw_iso_context_queue_flush(s->context); |
801 | } | |
802 | ||
7b3b0d85 TS |
803 | /* processing is done by master callback */ |
804 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
805 | size_t header_length, void *header, | |
806 | void *private_data) | |
807 | { | |
808 | return; | |
809 | } | |
810 | ||
811 | /* this is executed one time */ | |
812 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
813 | u32 cycle, size_t header_length, | |
814 | void *header, void *private_data) | |
815 | { | |
816 | struct amdtp_stream *s = private_data; | |
817 | ||
818 | /* | |
819 | * For in-stream, first packet has come. | |
820 | * For out-stream, prepared to transmit first packet | |
821 | */ | |
822 | s->callbacked = true; | |
823 | wake_up(&s->callback_wait); | |
824 | ||
825 | if (s->direction == AMDTP_IN_STREAM) | |
826 | context->callback.sc = in_stream_callback; | |
827 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
828 | context->callback.sc = slave_stream_callback; | |
829 | else | |
830 | context->callback.sc = out_stream_callback; | |
831 | ||
832 | context->callback.sc(context, cycle, header_length, header, s); | |
833 | } | |
834 | ||
31ef9134 | 835 | /** |
be4a2894 TS |
836 | * amdtp_stream_start - start transferring packets |
837 | * @s: the AMDTP stream to start | |
31ef9134 CL |
838 | * @channel: the isochronous channel on the bus |
839 | * @speed: firewire speed code | |
840 | * | |
841 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
842 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
843 | * device can be started. | |
31ef9134 | 844 | */ |
be4a2894 | 845 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
846 | { |
847 | static const struct { | |
848 | unsigned int data_block; | |
849 | unsigned int syt_offset; | |
850 | } initial_state[] = { | |
851 | [CIP_SFC_32000] = { 4, 3072 }, | |
852 | [CIP_SFC_48000] = { 6, 1024 }, | |
853 | [CIP_SFC_96000] = { 12, 1024 }, | |
854 | [CIP_SFC_192000] = { 24, 1024 }, | |
855 | [CIP_SFC_44100] = { 0, 67 }, | |
856 | [CIP_SFC_88200] = { 0, 67 }, | |
857 | [CIP_SFC_176400] = { 0, 67 }, | |
858 | }; | |
2b3fc456 TS |
859 | unsigned int header_size; |
860 | enum dma_data_direction dir; | |
7ab56645 | 861 | int type, tag, err; |
31ef9134 CL |
862 | |
863 | mutex_lock(&s->mutex); | |
864 | ||
be4a2894 | 865 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 866 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
867 | err = -EBADFD; |
868 | goto err_unlock; | |
869 | } | |
870 | ||
b6bc8123 TS |
871 | if (s->direction == AMDTP_IN_STREAM && |
872 | s->flags & CIP_SKIP_INIT_DBC_CHECK) | |
873 | s->data_block_counter = UINT_MAX; | |
874 | else | |
875 | s->data_block_counter = 0; | |
31ef9134 CL |
876 | s->data_block_state = initial_state[s->sfc].data_block; |
877 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
878 | s->last_syt_offset = TICKS_PER_CYCLE; | |
879 | ||
2b3fc456 TS |
880 | /* initialize packet buffer */ |
881 | if (s->direction == AMDTP_IN_STREAM) { | |
882 | dir = DMA_FROM_DEVICE; | |
883 | type = FW_ISO_CONTEXT_RECEIVE; | |
884 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
885 | } else { |
886 | dir = DMA_TO_DEVICE; | |
887 | type = FW_ISO_CONTEXT_TRANSMIT; | |
888 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 889 | } |
31ef9134 | 890 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 891 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
892 | if (err < 0) |
893 | goto err_unlock; | |
894 | ||
895 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 896 | type, channel, speed, header_size, |
7b3b0d85 | 897 | amdtp_stream_first_callback, s); |
31ef9134 CL |
898 | if (IS_ERR(s->context)) { |
899 | err = PTR_ERR(s->context); | |
900 | if (err == -EBUSY) | |
901 | dev_err(&s->unit->device, | |
be4a2894 | 902 | "no free stream on this controller\n"); |
31ef9134 CL |
903 | goto err_buffer; |
904 | } | |
905 | ||
be4a2894 | 906 | amdtp_stream_update(s); |
31ef9134 | 907 | |
ec00f5e4 | 908 | s->packet_index = 0; |
4b7da117 | 909 | do { |
2b3fc456 TS |
910 | if (s->direction == AMDTP_IN_STREAM) |
911 | err = queue_in_packet(s); | |
912 | else | |
913 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
914 | if (err < 0) |
915 | goto err_context; | |
916 | } while (s->packet_index > 0); | |
31ef9134 | 917 | |
2b3fc456 | 918 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7ab56645 TS |
919 | tag = FW_ISO_CONTEXT_MATCH_TAG1; |
920 | if (s->flags & CIP_EMPTY_WITH_TAG0) | |
921 | tag |= FW_ISO_CONTEXT_MATCH_TAG0; | |
922 | ||
7b3b0d85 | 923 | s->callbacked = false; |
7ab56645 | 924 | err = fw_iso_context_start(s->context, -1, 0, tag); |
31ef9134 CL |
925 | if (err < 0) |
926 | goto err_context; | |
927 | ||
928 | mutex_unlock(&s->mutex); | |
929 | ||
930 | return 0; | |
931 | ||
932 | err_context: | |
933 | fw_iso_context_destroy(s->context); | |
934 | s->context = ERR_PTR(-1); | |
935 | err_buffer: | |
936 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
937 | err_unlock: | |
938 | mutex_unlock(&s->mutex); | |
939 | ||
940 | return err; | |
941 | } | |
be4a2894 | 942 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 943 | |
e9148ddd | 944 | /** |
be4a2894 TS |
945 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
946 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
947 | * |
948 | * Returns the current buffer position, in frames. | |
949 | */ | |
be4a2894 | 950 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 951 | { |
92b862c7 | 952 | /* this optimization is allowed to be racy */ |
c8de6dbb | 953 | if (s->pointer_flush && amdtp_stream_running(s)) |
92b862c7 CL |
954 | fw_iso_context_flush_completions(s->context); |
955 | else | |
956 | s->pointer_flush = true; | |
e9148ddd CL |
957 | |
958 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
959 | } | |
be4a2894 | 960 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 961 | |
31ef9134 | 962 | /** |
be4a2894 TS |
963 | * amdtp_stream_update - update the stream after a bus reset |
964 | * @s: the AMDTP stream | |
31ef9134 | 965 | */ |
be4a2894 | 966 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
967 | { |
968 | ACCESS_ONCE(s->source_node_id_field) = | |
969 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
970 | } | |
be4a2894 | 971 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
972 | |
973 | /** | |
be4a2894 TS |
974 | * amdtp_stream_stop - stop sending packets |
975 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
976 | * |
977 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
978 | * itself can be stopped. | |
979 | */ | |
be4a2894 | 980 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
981 | { |
982 | mutex_lock(&s->mutex); | |
983 | ||
be4a2894 | 984 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
985 | mutex_unlock(&s->mutex); |
986 | return; | |
987 | } | |
988 | ||
76fb8789 | 989 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
990 | fw_iso_context_stop(s->context); |
991 | fw_iso_context_destroy(s->context); | |
992 | s->context = ERR_PTR(-1); | |
993 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
994 | ||
7b3b0d85 TS |
995 | s->callbacked = false; |
996 | ||
31ef9134 CL |
997 | mutex_unlock(&s->mutex); |
998 | } | |
be4a2894 | 999 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
1000 | |
1001 | /** | |
be4a2894 | 1002 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
1003 | * @s: the AMDTP stream about to be stopped |
1004 | * | |
1005 | * If the isochronous stream needs to be stopped asynchronously, call this | |
1006 | * function first to stop the PCM device. | |
1007 | */ | |
be4a2894 | 1008 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
1009 | { |
1010 | struct snd_pcm_substream *pcm; | |
1011 | ||
1012 | pcm = ACCESS_ONCE(s->pcm); | |
1fb8510c TI |
1013 | if (pcm) |
1014 | snd_pcm_stop_xrun(pcm); | |
31ef9134 | 1015 | } |
be4a2894 | 1016 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |