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 | ||
25ca917c CL |
24 | /* |
25 | * Nominally 3125 bytes/second, but the MIDI port's clock might be | |
26 | * 1% too slow, and the bus clock 100 ppm too fast. | |
27 | */ | |
28 | #define MIDI_BYTES_PER_SECOND 3093 | |
29 | ||
5c697e5b CL |
30 | /* |
31 | * Several devices look only at the first eight data blocks. | |
32 | * In any case, this is more than enough for the MIDI data rate. | |
33 | */ | |
34 | #define MAX_MIDI_RX_BLOCKS 8 | |
35 | ||
ca5b5050 | 36 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 microseconds */ |
31ef9134 | 37 | |
b445db44 TS |
38 | /* isochronous header parameters */ |
39 | #define ISO_DATA_LENGTH_SHIFT 16 | |
31ef9134 CL |
40 | #define TAG_CIP 1 |
41 | ||
b445db44 | 42 | /* common isochronous packet header parameters */ |
31ef9134 | 43 | #define CIP_EOH (1u << 31) |
b445db44 | 44 | #define CIP_EOH_MASK 0x80000000 |
31ef9134 | 45 | #define CIP_FMT_AM (0x10 << 24) |
b445db44 TS |
46 | #define CIP_FMT_MASK 0x3f000000 |
47 | #define CIP_SYT_MASK 0x0000ffff | |
48 | #define CIP_SYT_NO_INFO 0xffff | |
49 | #define CIP_FDF_MASK 0x00ff0000 | |
50 | #define CIP_FDF_SFC_SHIFT 16 | |
51 | ||
52 | /* | |
53 | * Audio and Music transfer protocol specific parameters | |
54 | * only "Clock-based rate control mode" is supported | |
55 | */ | |
56 | #define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3)) | |
2b3fc456 | 57 | #define AMDTP_FDF_NO_DATA 0xff |
b445db44 TS |
58 | #define AMDTP_DBS_MASK 0x00ff0000 |
59 | #define AMDTP_DBS_SHIFT 16 | |
60 | #define AMDTP_DBC_MASK 0x000000ff | |
31ef9134 CL |
61 | |
62 | /* TODO: make these configurable */ | |
63 | #define INTERRUPT_INTERVAL 16 | |
64 | #define QUEUE_LENGTH 48 | |
65 | ||
2b3fc456 | 66 | #define IN_PACKET_HEADER_SIZE 4 |
4b7da117 TS |
67 | #define OUT_PACKET_HEADER_SIZE 0 |
68 | ||
76fb8789 CL |
69 | static void pcm_period_tasklet(unsigned long data); |
70 | ||
31ef9134 | 71 | /** |
be4a2894 TS |
72 | * amdtp_stream_init - initialize an AMDTP stream structure |
73 | * @s: the AMDTP stream to initialize | |
31ef9134 | 74 | * @unit: the target of the stream |
3ff7e8f0 | 75 | * @dir: the direction of stream |
31ef9134 CL |
76 | * @flags: the packet transmission method to use |
77 | */ | |
be4a2894 | 78 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
3ff7e8f0 | 79 | enum amdtp_stream_direction dir, enum cip_flags flags) |
31ef9134 | 80 | { |
31ef9134 | 81 | s->unit = fw_unit_get(unit); |
3ff7e8f0 | 82 | s->direction = dir; |
31ef9134 CL |
83 | s->flags = flags; |
84 | s->context = ERR_PTR(-1); | |
85 | mutex_init(&s->mutex); | |
76fb8789 | 86 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 87 | s->packet_index = 0; |
31ef9134 | 88 | |
7b3b0d85 TS |
89 | init_waitqueue_head(&s->callback_wait); |
90 | s->callbacked = false; | |
91 | s->sync_slave = NULL; | |
92 | ||
31ef9134 CL |
93 | return 0; |
94 | } | |
be4a2894 | 95 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
96 | |
97 | /** | |
be4a2894 TS |
98 | * amdtp_stream_destroy - free stream resources |
99 | * @s: the AMDTP stream to destroy | |
31ef9134 | 100 | */ |
be4a2894 | 101 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 102 | { |
be4a2894 | 103 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
104 | mutex_destroy(&s->mutex); |
105 | fw_unit_put(s->unit); | |
106 | } | |
be4a2894 | 107 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 108 | |
c5280e99 | 109 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
110 | [CIP_SFC_32000] = 8, |
111 | [CIP_SFC_44100] = 8, | |
112 | [CIP_SFC_48000] = 8, | |
113 | [CIP_SFC_88200] = 16, | |
114 | [CIP_SFC_96000] = 16, | |
115 | [CIP_SFC_176400] = 32, | |
116 | [CIP_SFC_192000] = 32, | |
117 | }; | |
118 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
119 | ||
f9503a68 | 120 | const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = { |
1017abed TS |
121 | [CIP_SFC_32000] = 32000, |
122 | [CIP_SFC_44100] = 44100, | |
123 | [CIP_SFC_48000] = 48000, | |
124 | [CIP_SFC_88200] = 88200, | |
125 | [CIP_SFC_96000] = 96000, | |
126 | [CIP_SFC_176400] = 176400, | |
127 | [CIP_SFC_192000] = 192000, | |
128 | }; | |
129 | EXPORT_SYMBOL(amdtp_rate_table); | |
130 | ||
7b2d99fa TS |
131 | /** |
132 | * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream | |
133 | * @s: the AMDTP stream, which must be initialized. | |
134 | * @runtime: the PCM substream runtime | |
135 | */ | |
136 | int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, | |
137 | struct snd_pcm_runtime *runtime) | |
138 | { | |
139 | int err; | |
140 | ||
141 | /* AM824 in IEC 61883-6 can deliver 24bit data */ | |
142 | err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); | |
143 | if (err < 0) | |
144 | goto end; | |
145 | ||
146 | /* | |
147 | * Currently firewire-lib processes 16 packets in one software | |
148 | * interrupt callback. This equals to 2msec but actually the | |
149 | * interval of the interrupts has a jitter. | |
150 | * Additionally, even if adding a constraint to fit period size to | |
151 | * 2msec, actual calculated frames per period doesn't equal to 2msec, | |
152 | * depending on sampling rate. | |
153 | * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec. | |
154 | * Here let us use 5msec for safe period interrupt. | |
155 | */ | |
156 | err = snd_pcm_hw_constraint_minmax(runtime, | |
157 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
158 | 5000, UINT_MAX); | |
159 | if (err < 0) | |
160 | goto end; | |
161 | ||
162 | /* Non-Blocking stream has no more constraints */ | |
163 | if (!(s->flags & CIP_BLOCKING)) | |
164 | goto end; | |
165 | ||
166 | /* | |
167 | * One AMDTP packet can include some frames. In blocking mode, the | |
168 | * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, | |
169 | * depending on its sampling rate. For accurate period interrupt, it's | |
170 | * preferrable to aligh period/buffer sizes to current SYT_INTERVAL. | |
171 | * | |
172 | * TODO: These constraints can be improved with propper rules. | |
173 | * Currently apply LCM of SYT_INTEVALs. | |
174 | */ | |
175 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
176 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32); | |
177 | if (err < 0) | |
178 | goto end; | |
179 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
180 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32); | |
181 | end: | |
182 | return err; | |
183 | } | |
184 | EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); | |
185 | ||
31ef9134 | 186 | /** |
be4a2894 TS |
187 | * amdtp_stream_set_parameters - set stream parameters |
188 | * @s: the AMDTP stream to configure | |
31ef9134 | 189 | * @rate: the sample rate |
a7304e3b CL |
190 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
191 | * as AM824 multi-bit linear audio | |
192 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 193 | * |
a7304e3b | 194 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
195 | * changed while the stream is running. |
196 | */ | |
be4a2894 TS |
197 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
198 | unsigned int rate, | |
199 | unsigned int pcm_channels, | |
200 | unsigned int midi_ports) | |
31ef9134 | 201 | { |
77d2a8a4 | 202 | unsigned int i, sfc, midi_channels; |
31ef9134 | 203 | |
83d8d72d TS |
204 | midi_channels = DIV_ROUND_UP(midi_ports, 8); |
205 | ||
77d2a8a4 TS |
206 | if (WARN_ON(amdtp_stream_running(s)) | |
207 | WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) | | |
83d8d72d | 208 | WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI)) |
31ef9134 CL |
209 | return; |
210 | ||
f9503a68 | 211 | for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) |
1017abed | 212 | if (amdtp_rate_table[sfc] == rate) |
e84d15f6 | 213 | goto sfc_found; |
31ef9134 | 214 | WARN_ON(1); |
e84d15f6 CL |
215 | return; |
216 | ||
217 | sfc_found: | |
10550bea | 218 | s->pcm_channels = pcm_channels; |
e84d15f6 | 219 | s->sfc = sfc; |
77d2a8a4 | 220 | s->data_block_quadlets = s->pcm_channels + midi_channels; |
a7304e3b CL |
221 | s->midi_ports = midi_ports; |
222 | ||
223 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
224 | |
225 | /* default buffering in the device */ | |
226 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
227 | if (s->flags & CIP_BLOCKING) | |
228 | /* additional buffering needed to adjust for no-data packets */ | |
229 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
77d2a8a4 TS |
230 | |
231 | /* init the position map for PCM and MIDI channels */ | |
232 | for (i = 0; i < pcm_channels; i++) | |
233 | s->pcm_positions[i] = i; | |
234 | s->midi_position = s->pcm_channels; | |
25ca917c CL |
235 | |
236 | /* | |
237 | * We do not know the actual MIDI FIFO size of most devices. Just | |
238 | * assume two bytes, i.e., one byte can be received over the bus while | |
239 | * the previous one is transmitted over MIDI. | |
240 | * (The value here is adjusted for midi_ratelimit_per_packet().) | |
241 | */ | |
242 | s->midi_fifo_limit = rate - MIDI_BYTES_PER_SECOND * s->syt_interval + 1; | |
31ef9134 | 243 | } |
be4a2894 | 244 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
245 | |
246 | /** | |
be4a2894 TS |
247 | * amdtp_stream_get_max_payload - get the stream's packet size |
248 | * @s: the AMDTP stream | |
31ef9134 CL |
249 | * |
250 | * This function must not be called before the stream has been configured | |
be4a2894 | 251 | * with amdtp_stream_set_parameters(). |
31ef9134 | 252 | */ |
be4a2894 | 253 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 254 | { |
e84d15f6 | 255 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 256 | } |
be4a2894 | 257 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 258 | |
be4a2894 | 259 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
260 | struct snd_pcm_substream *pcm, |
261 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 262 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
263 | struct snd_pcm_substream *pcm, |
264 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
265 | static void amdtp_read_s32(struct amdtp_stream *s, |
266 | struct snd_pcm_substream *pcm, | |
267 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
268 | |
269 | /** | |
be4a2894 TS |
270 | * amdtp_stream_set_pcm_format - set the PCM format |
271 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
272 | * @format: the format of the ALSA PCM device |
273 | * | |
a7304e3b CL |
274 | * The sample format must be set after the other paramters (rate/PCM channels/ |
275 | * MIDI) and before the stream is started, and must not be changed while the | |
276 | * stream is running. | |
31ef9134 | 277 | */ |
be4a2894 TS |
278 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
279 | snd_pcm_format_t format) | |
31ef9134 | 280 | { |
83d8d72d | 281 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
282 | return; |
283 | ||
284 | switch (format) { | |
285 | default: | |
286 | WARN_ON(1); | |
287 | /* fall through */ | |
288 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 | 289 | if (s->direction == AMDTP_OUT_STREAM) { |
10550bea | 290 | s->transfer_samples = amdtp_write_s16; |
2b3fc456 TS |
291 | break; |
292 | } | |
293 | WARN_ON(1); | |
294 | /* fall through */ | |
31ef9134 | 295 | case SNDRV_PCM_FORMAT_S32: |
10550bea TS |
296 | if (s->direction == AMDTP_OUT_STREAM) |
297 | s->transfer_samples = amdtp_write_s32; | |
298 | else | |
299 | s->transfer_samples = amdtp_read_s32; | |
31ef9134 CL |
300 | break; |
301 | } | |
302 | } | |
be4a2894 | 303 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 304 | |
76fb8789 | 305 | /** |
be4a2894 TS |
306 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
307 | * @s: the AMDTP stream | |
76fb8789 CL |
308 | * |
309 | * This function should be called from the PCM device's .prepare callback. | |
310 | */ | |
be4a2894 | 311 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
312 | { |
313 | tasklet_kill(&s->period_tasklet); | |
314 | s->pcm_buffer_pointer = 0; | |
315 | s->pcm_period_pointer = 0; | |
92b862c7 | 316 | s->pointer_flush = true; |
76fb8789 | 317 | } |
be4a2894 | 318 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 319 | |
be4a2894 | 320 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
321 | { |
322 | unsigned int phase, data_blocks; | |
323 | ||
ccccad86 TS |
324 | if (s->flags & CIP_BLOCKING) |
325 | data_blocks = s->syt_interval; | |
326 | else if (!cip_sfc_is_base_44100(s->sfc)) { | |
31ef9134 CL |
327 | /* Sample_rate / 8000 is an integer, and precomputed. */ |
328 | data_blocks = s->data_block_state; | |
329 | } else { | |
330 | phase = s->data_block_state; | |
331 | ||
332 | /* | |
333 | * This calculates the number of data blocks per packet so that | |
334 | * 1) the overall rate is correct and exactly synchronized to | |
335 | * the bus clock, and | |
336 | * 2) packets with a rounded-up number of blocks occur as early | |
337 | * as possible in the sequence (to prevent underruns of the | |
338 | * device's buffer). | |
339 | */ | |
340 | if (s->sfc == CIP_SFC_44100) | |
341 | /* 6 6 5 6 5 6 5 ... */ | |
342 | data_blocks = 5 + ((phase & 1) ^ | |
343 | (phase == 0 || phase >= 40)); | |
344 | else | |
345 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
346 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
347 | if (++phase >= (80 >> (s->sfc >> 1))) | |
348 | phase = 0; | |
349 | s->data_block_state = phase; | |
350 | } | |
351 | ||
352 | return data_blocks; | |
353 | } | |
354 | ||
be4a2894 | 355 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
356 | unsigned int cycle) |
357 | { | |
358 | unsigned int syt_offset, phase, index, syt; | |
359 | ||
360 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
361 | if (!cip_sfc_is_base_44100(s->sfc)) | |
362 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
363 | else { | |
364 | /* | |
365 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
366 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
367 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
368 | * elements is about 1386.23. Rounding the results of this | |
369 | * formula to the SYT precision results in a sequence of | |
370 | * differences that begins with: | |
371 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
372 | * This code generates _exactly_ the same sequence. | |
373 | */ | |
374 | phase = s->syt_offset_state; | |
375 | index = phase % 13; | |
376 | syt_offset = s->last_syt_offset; | |
377 | syt_offset += 1386 + ((index && !(index & 3)) || | |
378 | phase == 146); | |
379 | if (++phase >= 147) | |
380 | phase = 0; | |
381 | s->syt_offset_state = phase; | |
382 | } | |
383 | } else | |
384 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
385 | s->last_syt_offset = syt_offset; | |
386 | ||
be454366 | 387 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 388 | syt_offset += s->transfer_delay; |
be454366 CL |
389 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
390 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 391 | |
b445db44 | 392 | return syt & CIP_SYT_MASK; |
be454366 | 393 | } else { |
b445db44 | 394 | return CIP_SYT_NO_INFO; |
be454366 | 395 | } |
31ef9134 CL |
396 | } |
397 | ||
be4a2894 | 398 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
399 | struct snd_pcm_substream *pcm, |
400 | __be32 *buffer, unsigned int frames) | |
401 | { | |
402 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 403 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
404 | const u32 *src; |
405 | ||
406 | channels = s->pcm_channels; | |
407 | src = (void *)runtime->dma_area + | |
e84841f9 | 408 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 409 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
410 | |
411 | for (i = 0; i < frames; ++i) { | |
412 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
413 | buffer[s->pcm_positions[c]] = |
414 | cpu_to_be32((*src >> 8) | 0x40000000); | |
31ef9134 | 415 | src++; |
31ef9134 | 416 | } |
77d2a8a4 | 417 | buffer += s->data_block_quadlets; |
31ef9134 CL |
418 | if (--remaining_frames == 0) |
419 | src = (void *)runtime->dma_area; | |
420 | } | |
421 | } | |
422 | ||
be4a2894 | 423 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
424 | struct snd_pcm_substream *pcm, |
425 | __be32 *buffer, unsigned int frames) | |
426 | { | |
427 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 428 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
429 | const u16 *src; |
430 | ||
431 | channels = s->pcm_channels; | |
432 | src = (void *)runtime->dma_area + | |
e84841f9 | 433 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 434 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
435 | |
436 | for (i = 0; i < frames; ++i) { | |
437 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 438 | buffer[s->pcm_positions[c]] = |
a6975f2a | 439 | cpu_to_be32((*src << 8) | 0x42000000); |
31ef9134 | 440 | src++; |
31ef9134 | 441 | } |
77d2a8a4 | 442 | buffer += s->data_block_quadlets; |
31ef9134 CL |
443 | if (--remaining_frames == 0) |
444 | src = (void *)runtime->dma_area; | |
445 | } | |
446 | } | |
447 | ||
2b3fc456 TS |
448 | static void amdtp_read_s32(struct amdtp_stream *s, |
449 | struct snd_pcm_substream *pcm, | |
450 | __be32 *buffer, unsigned int frames) | |
451 | { | |
452 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
453 | unsigned int channels, remaining_frames, i, c; | |
454 | u32 *dst; | |
455 | ||
456 | channels = s->pcm_channels; | |
457 | dst = (void *)runtime->dma_area + | |
458 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
459 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
460 | ||
461 | for (i = 0; i < frames; ++i) { | |
462 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 463 | *dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8; |
2b3fc456 TS |
464 | dst++; |
465 | } | |
466 | buffer += s->data_block_quadlets; | |
467 | if (--remaining_frames == 0) | |
468 | dst = (void *)runtime->dma_area; | |
469 | } | |
470 | } | |
471 | ||
be4a2894 | 472 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
473 | __be32 *buffer, unsigned int frames) |
474 | { | |
475 | unsigned int i, c; | |
476 | ||
477 | for (i = 0; i < frames; ++i) { | |
478 | for (c = 0; c < s->pcm_channels; ++c) | |
77d2a8a4 | 479 | buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000); |
31ef9134 CL |
480 | buffer += s->data_block_quadlets; |
481 | } | |
482 | } | |
483 | ||
25ca917c CL |
484 | /* |
485 | * To avoid sending MIDI bytes at too high a rate, assume that the receiving | |
486 | * device has a FIFO, and track how much it is filled. This values increases | |
487 | * by one whenever we send one byte in a packet, but the FIFO empties at | |
488 | * a constant rate independent of our packet rate. One packet has syt_interval | |
489 | * samples, so the number of bytes that empty out of the FIFO, per packet(!), | |
490 | * is MIDI_BYTES_PER_SECOND * syt_interval / sample_rate. To avoid storing | |
491 | * fractional values, the values in midi_fifo_used[] are measured in bytes | |
492 | * multiplied by the sample rate. | |
493 | */ | |
494 | static bool midi_ratelimit_per_packet(struct amdtp_stream *s, unsigned int port) | |
495 | { | |
496 | int used; | |
497 | ||
498 | used = s->midi_fifo_used[port]; | |
499 | if (used == 0) /* common shortcut */ | |
500 | return true; | |
501 | ||
502 | used -= MIDI_BYTES_PER_SECOND * s->syt_interval; | |
503 | used = max(used, 0); | |
504 | s->midi_fifo_used[port] = used; | |
505 | ||
506 | return used < s->midi_fifo_limit; | |
507 | } | |
508 | ||
509 | static void midi_rate_use_one_byte(struct amdtp_stream *s, unsigned int port) | |
510 | { | |
511 | s->midi_fifo_used[port] += amdtp_rate_table[s->sfc]; | |
512 | } | |
513 | ||
be4a2894 | 514 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
515 | __be32 *buffer, unsigned int frames) |
516 | { | |
83d8d72d TS |
517 | unsigned int f, port; |
518 | u8 *b; | |
519 | ||
520 | for (f = 0; f < frames; f++) { | |
77d2a8a4 | 521 | b = (u8 *)&buffer[s->midi_position]; |
83d8d72d TS |
522 | |
523 | port = (s->data_block_counter + f) % 8; | |
25ca917c CL |
524 | if (f < MAX_MIDI_RX_BLOCKS && |
525 | midi_ratelimit_per_packet(s, port) && | |
526 | s->midi[port] != NULL && | |
527 | snd_rawmidi_transmit(s->midi[port], &b[1], 1) == 1) { | |
528 | midi_rate_use_one_byte(s, port); | |
83d8d72d | 529 | b[0] = 0x81; |
25ca917c CL |
530 | } else { |
531 | b[0] = 0x80; | |
532 | b[1] = 0; | |
533 | } | |
534 | b[2] = 0; | |
535 | b[3] = 0; | |
83d8d72d TS |
536 | |
537 | buffer += s->data_block_quadlets; | |
538 | } | |
539 | } | |
540 | ||
541 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
542 | __be32 *buffer, unsigned int frames) | |
543 | { | |
544 | unsigned int f, port; | |
545 | int len; | |
546 | u8 *b; | |
547 | ||
548 | for (f = 0; f < frames; f++) { | |
549 | port = (s->data_block_counter + f) % 8; | |
77d2a8a4 | 550 | b = (u8 *)&buffer[s->midi_position]; |
31ef9134 | 551 | |
83d8d72d TS |
552 | len = b[0] - 0x80; |
553 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
554 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
555 | ||
556 | buffer += s->data_block_quadlets; | |
557 | } | |
31ef9134 CL |
558 | } |
559 | ||
4b7da117 TS |
560 | static void update_pcm_pointers(struct amdtp_stream *s, |
561 | struct snd_pcm_substream *pcm, | |
562 | unsigned int frames) | |
65845f29 TS |
563 | { |
564 | unsigned int ptr; | |
565 | ||
566 | /* | |
567 | * In IEC 61883-6, one data block represents one event. In ALSA, one | |
568 | * event equals to one PCM frame. But Dice has a quirk to transfer | |
569 | * two PCM frames in one data block. | |
570 | */ | |
571 | if (s->double_pcm_frames) | |
572 | frames *= 2; | |
4b7da117 | 573 | |
4b7da117 TS |
574 | ptr = s->pcm_buffer_pointer + frames; |
575 | if (ptr >= pcm->runtime->buffer_size) | |
576 | ptr -= pcm->runtime->buffer_size; | |
577 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
578 | ||
579 | s->pcm_period_pointer += frames; | |
580 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
581 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
582 | s->pointer_flush = false; | |
583 | tasklet_hi_schedule(&s->period_tasklet); | |
584 | } | |
585 | } | |
586 | ||
587 | static void pcm_period_tasklet(unsigned long data) | |
588 | { | |
589 | struct amdtp_stream *s = (void *)data; | |
590 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
591 | ||
592 | if (pcm) | |
593 | snd_pcm_period_elapsed(pcm); | |
594 | } | |
595 | ||
596 | static int queue_packet(struct amdtp_stream *s, | |
597 | unsigned int header_length, | |
598 | unsigned int payload_length, bool skip) | |
599 | { | |
600 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
601 | int err = 0; |
602 | ||
603 | if (IS_ERR(s->context)) | |
604 | goto end; | |
4b7da117 TS |
605 | |
606 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
607 | p.tag = TAG_CIP; | |
608 | p.header_length = header_length; | |
609 | p.payload_length = (!skip) ? payload_length : 0; | |
610 | p.skip = skip; | |
611 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
612 | s->buffer.packets[s->packet_index].offset); | |
613 | if (err < 0) { | |
614 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
615 | goto end; | |
616 | } | |
617 | ||
618 | if (++s->packet_index >= QUEUE_LENGTH) | |
619 | s->packet_index = 0; | |
620 | end: | |
621 | return err; | |
622 | } | |
623 | ||
624 | static inline int queue_out_packet(struct amdtp_stream *s, | |
625 | unsigned int payload_length, bool skip) | |
626 | { | |
627 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
628 | payload_length, skip); | |
629 | } | |
630 | ||
2b3fc456 TS |
631 | static inline int queue_in_packet(struct amdtp_stream *s) |
632 | { | |
633 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
634 | amdtp_stream_get_max_payload(s), false); | |
635 | } | |
636 | ||
ccccad86 | 637 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
638 | { |
639 | __be32 *buffer; | |
ccccad86 | 640 | unsigned int data_blocks, payload_length; |
31ef9134 | 641 | struct snd_pcm_substream *pcm; |
31ef9134 | 642 | |
ec00f5e4 CL |
643 | if (s->packet_index < 0) |
644 | return; | |
ec00f5e4 | 645 | |
82755abf | 646 | /* this module generate empty packet for 'no data' */ |
ccccad86 | 647 | if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO)) |
e84d15f6 | 648 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
649 | else |
650 | data_blocks = 0; | |
31ef9134 | 651 | |
ccccad86 | 652 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 653 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 654 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
655 | s->data_block_counter); |
656 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 657 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
658 | buffer += 2; |
659 | ||
660 | pcm = ACCESS_ONCE(s->pcm); | |
661 | if (pcm) | |
662 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
663 | else | |
664 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
665 | if (s->midi_ports) | |
666 | amdtp_fill_midi(s, buffer, data_blocks); | |
667 | ||
668 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
669 | ||
4b7da117 TS |
670 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
671 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 672 | s->packet_index = -1; |
be4a2894 | 673 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
674 | return; |
675 | } | |
31ef9134 | 676 | |
76fb8789 | 677 | if (pcm) |
4b7da117 | 678 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
679 | } |
680 | ||
2b3fc456 TS |
681 | static void handle_in_packet(struct amdtp_stream *s, |
682 | unsigned int payload_quadlets, | |
683 | __be32 *buffer) | |
684 | { | |
685 | u32 cip_header[2]; | |
d9cd0065 TS |
686 | unsigned int data_blocks, data_block_quadlets, data_block_counter, |
687 | dbc_interval; | |
2b3fc456 | 688 | struct snd_pcm_substream *pcm = NULL; |
c8bdf49b | 689 | bool lost; |
2b3fc456 TS |
690 | |
691 | cip_header[0] = be32_to_cpu(buffer[0]); | |
692 | cip_header[1] = be32_to_cpu(buffer[1]); | |
693 | ||
694 | /* | |
695 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 696 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 TS |
697 | */ |
698 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
699 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
700 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
701 | dev_info_ratelimited(&s->unit->device, | |
702 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
703 | cip_header[0], cip_header[1]); | |
704 | goto end; | |
705 | } | |
706 | ||
707 | /* Calculate data blocks */ | |
708 | if (payload_quadlets < 3 || | |
709 | ((cip_header[1] & CIP_FDF_MASK) == | |
710 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
711 | data_blocks = 0; | |
712 | } else { | |
713 | data_block_quadlets = | |
714 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
715 | /* avoid division by zero */ | |
716 | if (data_block_quadlets == 0) { | |
717 | dev_info_ratelimited(&s->unit->device, | |
718 | "Detect invalid value in dbs field: %08X\n", | |
719 | cip_header[0]); | |
720 | goto err; | |
721 | } | |
69702239 TS |
722 | if (s->flags & CIP_WRONG_DBS) |
723 | data_block_quadlets = s->data_block_quadlets; | |
2b3fc456 TS |
724 | |
725 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
726 | } | |
727 | ||
728 | /* Check data block counter continuity */ | |
729 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
9d59124c TS |
730 | if (data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && |
731 | s->data_block_counter != UINT_MAX) | |
732 | data_block_counter = s->data_block_counter; | |
733 | ||
b6bc8123 TS |
734 | if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) && data_block_counter == 0) || |
735 | (s->data_block_counter == UINT_MAX)) { | |
b84b1a27 TS |
736 | lost = false; |
737 | } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { | |
c8bdf49b | 738 | lost = data_block_counter != s->data_block_counter; |
d9cd0065 TS |
739 | } else { |
740 | if ((data_blocks > 0) && (s->tx_dbc_interval > 0)) | |
741 | dbc_interval = s->tx_dbc_interval; | |
742 | else | |
743 | dbc_interval = data_blocks; | |
744 | ||
c8bdf49b | 745 | lost = data_block_counter != |
d9cd0065 TS |
746 | ((s->data_block_counter + dbc_interval) & 0xff); |
747 | } | |
c8bdf49b TS |
748 | |
749 | if (lost) { | |
2b3fc456 TS |
750 | dev_info(&s->unit->device, |
751 | "Detect discontinuity of CIP: %02X %02X\n", | |
752 | s->data_block_counter, data_block_counter); | |
753 | goto err; | |
754 | } | |
755 | ||
756 | if (data_blocks > 0) { | |
757 | buffer += 2; | |
758 | ||
759 | pcm = ACCESS_ONCE(s->pcm); | |
760 | if (pcm) | |
761 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
762 | |
763 | if (s->midi_ports) | |
764 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
765 | } |
766 | ||
c8bdf49b TS |
767 | if (s->flags & CIP_DBC_IS_END_EVENT) |
768 | s->data_block_counter = data_block_counter; | |
769 | else | |
770 | s->data_block_counter = | |
771 | (data_block_counter + data_blocks) & 0xff; | |
2b3fc456 TS |
772 | end: |
773 | if (queue_in_packet(s) < 0) | |
774 | goto err; | |
775 | ||
776 | if (pcm) | |
777 | update_pcm_pointers(s, pcm, data_blocks); | |
778 | ||
779 | return; | |
780 | err: | |
781 | s->packet_index = -1; | |
782 | amdtp_stream_pcm_abort(s); | |
783 | } | |
784 | ||
4b7da117 TS |
785 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
786 | size_t header_length, void *header, | |
787 | void *private_data) | |
31ef9134 | 788 | { |
be4a2894 | 789 | struct amdtp_stream *s = private_data; |
ccccad86 | 790 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
791 | |
792 | /* | |
793 | * Compute the cycle of the last queued packet. | |
794 | * (We need only the four lowest bits for the SYT, so we can ignore | |
795 | * that bits 0-11 must wrap around at 3072.) | |
796 | */ | |
797 | cycle += QUEUE_LENGTH - packets; | |
798 | ||
ccccad86 TS |
799 | for (i = 0; i < packets; ++i) { |
800 | syt = calculate_syt(s, ++cycle); | |
801 | handle_out_packet(s, syt); | |
802 | } | |
13882a82 | 803 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
804 | } |
805 | ||
2b3fc456 TS |
806 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
807 | size_t header_length, void *header, | |
808 | void *private_data) | |
809 | { | |
810 | struct amdtp_stream *s = private_data; | |
7b3b0d85 | 811 | unsigned int p, syt, packets, payload_quadlets; |
2b3fc456 TS |
812 | __be32 *buffer, *headers = header; |
813 | ||
814 | /* The number of packets in buffer */ | |
815 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
816 | ||
817 | for (p = 0; p < packets; p++) { | |
818 | if (s->packet_index < 0) | |
7b3b0d85 TS |
819 | break; |
820 | ||
2b3fc456 TS |
821 | buffer = s->buffer.packets[s->packet_index].buffer; |
822 | ||
7b3b0d85 TS |
823 | /* Process sync slave stream */ |
824 | if (s->sync_slave && s->sync_slave->callbacked) { | |
825 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
826 | handle_out_packet(s->sync_slave, syt); | |
827 | } | |
828 | ||
2b3fc456 TS |
829 | /* The number of quadlets in this packet */ |
830 | payload_quadlets = | |
831 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
832 | handle_in_packet(s, payload_quadlets, buffer); | |
833 | } | |
834 | ||
7b3b0d85 TS |
835 | /* Queueing error or detecting discontinuity */ |
836 | if (s->packet_index < 0) { | |
837 | /* Abort sync slave. */ | |
838 | if (s->sync_slave) { | |
839 | s->sync_slave->packet_index = -1; | |
840 | amdtp_stream_pcm_abort(s->sync_slave); | |
841 | } | |
842 | return; | |
843 | } | |
844 | ||
845 | /* when sync to device, flush the packets for slave stream */ | |
846 | if (s->sync_slave && s->sync_slave->callbacked) | |
847 | fw_iso_context_queue_flush(s->sync_slave->context); | |
848 | ||
2b3fc456 TS |
849 | fw_iso_context_queue_flush(s->context); |
850 | } | |
851 | ||
7b3b0d85 TS |
852 | /* processing is done by master callback */ |
853 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
854 | size_t header_length, void *header, | |
855 | void *private_data) | |
856 | { | |
857 | return; | |
858 | } | |
859 | ||
860 | /* this is executed one time */ | |
861 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
862 | u32 cycle, size_t header_length, | |
863 | void *header, void *private_data) | |
864 | { | |
865 | struct amdtp_stream *s = private_data; | |
866 | ||
867 | /* | |
868 | * For in-stream, first packet has come. | |
869 | * For out-stream, prepared to transmit first packet | |
870 | */ | |
871 | s->callbacked = true; | |
872 | wake_up(&s->callback_wait); | |
873 | ||
874 | if (s->direction == AMDTP_IN_STREAM) | |
875 | context->callback.sc = in_stream_callback; | |
876 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
877 | context->callback.sc = slave_stream_callback; | |
878 | else | |
879 | context->callback.sc = out_stream_callback; | |
880 | ||
881 | context->callback.sc(context, cycle, header_length, header, s); | |
882 | } | |
883 | ||
31ef9134 | 884 | /** |
be4a2894 TS |
885 | * amdtp_stream_start - start transferring packets |
886 | * @s: the AMDTP stream to start | |
31ef9134 CL |
887 | * @channel: the isochronous channel on the bus |
888 | * @speed: firewire speed code | |
889 | * | |
890 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
891 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
892 | * device can be started. | |
31ef9134 | 893 | */ |
be4a2894 | 894 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
895 | { |
896 | static const struct { | |
897 | unsigned int data_block; | |
898 | unsigned int syt_offset; | |
899 | } initial_state[] = { | |
900 | [CIP_SFC_32000] = { 4, 3072 }, | |
901 | [CIP_SFC_48000] = { 6, 1024 }, | |
902 | [CIP_SFC_96000] = { 12, 1024 }, | |
903 | [CIP_SFC_192000] = { 24, 1024 }, | |
904 | [CIP_SFC_44100] = { 0, 67 }, | |
905 | [CIP_SFC_88200] = { 0, 67 }, | |
906 | [CIP_SFC_176400] = { 0, 67 }, | |
907 | }; | |
2b3fc456 TS |
908 | unsigned int header_size; |
909 | enum dma_data_direction dir; | |
7ab56645 | 910 | int type, tag, err; |
31ef9134 CL |
911 | |
912 | mutex_lock(&s->mutex); | |
913 | ||
be4a2894 | 914 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 915 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
916 | err = -EBADFD; |
917 | goto err_unlock; | |
918 | } | |
919 | ||
b6bc8123 TS |
920 | if (s->direction == AMDTP_IN_STREAM && |
921 | s->flags & CIP_SKIP_INIT_DBC_CHECK) | |
922 | s->data_block_counter = UINT_MAX; | |
923 | else | |
924 | s->data_block_counter = 0; | |
31ef9134 CL |
925 | s->data_block_state = initial_state[s->sfc].data_block; |
926 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
927 | s->last_syt_offset = TICKS_PER_CYCLE; | |
928 | ||
2b3fc456 TS |
929 | /* initialize packet buffer */ |
930 | if (s->direction == AMDTP_IN_STREAM) { | |
931 | dir = DMA_FROM_DEVICE; | |
932 | type = FW_ISO_CONTEXT_RECEIVE; | |
933 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
934 | } else { |
935 | dir = DMA_TO_DEVICE; | |
936 | type = FW_ISO_CONTEXT_TRANSMIT; | |
937 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 938 | } |
31ef9134 | 939 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 940 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
941 | if (err < 0) |
942 | goto err_unlock; | |
943 | ||
944 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 945 | type, channel, speed, header_size, |
7b3b0d85 | 946 | amdtp_stream_first_callback, s); |
31ef9134 CL |
947 | if (IS_ERR(s->context)) { |
948 | err = PTR_ERR(s->context); | |
949 | if (err == -EBUSY) | |
950 | dev_err(&s->unit->device, | |
be4a2894 | 951 | "no free stream on this controller\n"); |
31ef9134 CL |
952 | goto err_buffer; |
953 | } | |
954 | ||
be4a2894 | 955 | amdtp_stream_update(s); |
31ef9134 | 956 | |
ec00f5e4 | 957 | s->packet_index = 0; |
4b7da117 | 958 | do { |
2b3fc456 TS |
959 | if (s->direction == AMDTP_IN_STREAM) |
960 | err = queue_in_packet(s); | |
961 | else | |
962 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
963 | if (err < 0) |
964 | goto err_context; | |
965 | } while (s->packet_index > 0); | |
31ef9134 | 966 | |
2b3fc456 | 967 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7ab56645 TS |
968 | tag = FW_ISO_CONTEXT_MATCH_TAG1; |
969 | if (s->flags & CIP_EMPTY_WITH_TAG0) | |
970 | tag |= FW_ISO_CONTEXT_MATCH_TAG0; | |
971 | ||
7b3b0d85 | 972 | s->callbacked = false; |
7ab56645 | 973 | err = fw_iso_context_start(s->context, -1, 0, tag); |
31ef9134 CL |
974 | if (err < 0) |
975 | goto err_context; | |
976 | ||
977 | mutex_unlock(&s->mutex); | |
978 | ||
979 | return 0; | |
980 | ||
981 | err_context: | |
982 | fw_iso_context_destroy(s->context); | |
983 | s->context = ERR_PTR(-1); | |
984 | err_buffer: | |
985 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
986 | err_unlock: | |
987 | mutex_unlock(&s->mutex); | |
988 | ||
989 | return err; | |
990 | } | |
be4a2894 | 991 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 992 | |
e9148ddd | 993 | /** |
be4a2894 TS |
994 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
995 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
996 | * |
997 | * Returns the current buffer position, in frames. | |
998 | */ | |
be4a2894 | 999 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 1000 | { |
92b862c7 | 1001 | /* this optimization is allowed to be racy */ |
c8de6dbb | 1002 | if (s->pointer_flush && amdtp_stream_running(s)) |
92b862c7 CL |
1003 | fw_iso_context_flush_completions(s->context); |
1004 | else | |
1005 | s->pointer_flush = true; | |
e9148ddd CL |
1006 | |
1007 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
1008 | } | |
be4a2894 | 1009 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 1010 | |
31ef9134 | 1011 | /** |
be4a2894 TS |
1012 | * amdtp_stream_update - update the stream after a bus reset |
1013 | * @s: the AMDTP stream | |
31ef9134 | 1014 | */ |
be4a2894 | 1015 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
1016 | { |
1017 | ACCESS_ONCE(s->source_node_id_field) = | |
1018 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
1019 | } | |
be4a2894 | 1020 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
1021 | |
1022 | /** | |
be4a2894 TS |
1023 | * amdtp_stream_stop - stop sending packets |
1024 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
1025 | * |
1026 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
1027 | * itself can be stopped. | |
1028 | */ | |
be4a2894 | 1029 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
1030 | { |
1031 | mutex_lock(&s->mutex); | |
1032 | ||
be4a2894 | 1033 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
1034 | mutex_unlock(&s->mutex); |
1035 | return; | |
1036 | } | |
1037 | ||
76fb8789 | 1038 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
1039 | fw_iso_context_stop(s->context); |
1040 | fw_iso_context_destroy(s->context); | |
1041 | s->context = ERR_PTR(-1); | |
1042 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
1043 | ||
7b3b0d85 TS |
1044 | s->callbacked = false; |
1045 | ||
31ef9134 CL |
1046 | mutex_unlock(&s->mutex); |
1047 | } | |
be4a2894 | 1048 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
1049 | |
1050 | /** | |
be4a2894 | 1051 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
1052 | * @s: the AMDTP stream about to be stopped |
1053 | * | |
1054 | * If the isochronous stream needs to be stopped asynchronously, call this | |
1055 | * function first to stop the PCM device. | |
1056 | */ | |
be4a2894 | 1057 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
1058 | { |
1059 | struct snd_pcm_substream *pcm; | |
1060 | ||
1061 | pcm = ACCESS_ONCE(s->pcm); | |
1fb8510c TI |
1062 | if (pcm) |
1063 | snd_pcm_stop_xrun(pcm); | |
31ef9134 | 1064 | } |
be4a2894 | 1065 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |