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Commit | Line | Data |
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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 | { |
c6f224dc | 81 | s->unit = 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 | 104 | mutex_destroy(&s->mutex); |
31ef9134 | 105 | } |
be4a2894 | 106 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 107 | |
c5280e99 | 108 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
109 | [CIP_SFC_32000] = 8, |
110 | [CIP_SFC_44100] = 8, | |
111 | [CIP_SFC_48000] = 8, | |
112 | [CIP_SFC_88200] = 16, | |
113 | [CIP_SFC_96000] = 16, | |
114 | [CIP_SFC_176400] = 32, | |
115 | [CIP_SFC_192000] = 32, | |
116 | }; | |
117 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
118 | ||
f9503a68 | 119 | const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = { |
1017abed TS |
120 | [CIP_SFC_32000] = 32000, |
121 | [CIP_SFC_44100] = 44100, | |
122 | [CIP_SFC_48000] = 48000, | |
123 | [CIP_SFC_88200] = 88200, | |
124 | [CIP_SFC_96000] = 96000, | |
125 | [CIP_SFC_176400] = 176400, | |
126 | [CIP_SFC_192000] = 192000, | |
127 | }; | |
128 | EXPORT_SYMBOL(amdtp_rate_table); | |
129 | ||
7b2d99fa TS |
130 | /** |
131 | * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream | |
132 | * @s: the AMDTP stream, which must be initialized. | |
133 | * @runtime: the PCM substream runtime | |
134 | */ | |
135 | int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, | |
136 | struct snd_pcm_runtime *runtime) | |
137 | { | |
138 | int err; | |
139 | ||
140 | /* AM824 in IEC 61883-6 can deliver 24bit data */ | |
141 | err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); | |
142 | if (err < 0) | |
143 | goto end; | |
144 | ||
145 | /* | |
146 | * Currently firewire-lib processes 16 packets in one software | |
147 | * interrupt callback. This equals to 2msec but actually the | |
148 | * interval of the interrupts has a jitter. | |
149 | * Additionally, even if adding a constraint to fit period size to | |
150 | * 2msec, actual calculated frames per period doesn't equal to 2msec, | |
151 | * depending on sampling rate. | |
152 | * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec. | |
153 | * Here let us use 5msec for safe period interrupt. | |
154 | */ | |
155 | err = snd_pcm_hw_constraint_minmax(runtime, | |
156 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
157 | 5000, UINT_MAX); | |
158 | if (err < 0) | |
159 | goto end; | |
160 | ||
161 | /* Non-Blocking stream has no more constraints */ | |
162 | if (!(s->flags & CIP_BLOCKING)) | |
163 | goto end; | |
164 | ||
165 | /* | |
166 | * One AMDTP packet can include some frames. In blocking mode, the | |
167 | * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, | |
168 | * depending on its sampling rate. For accurate period interrupt, it's | |
ce991981 | 169 | * preferrable to align period/buffer sizes to current SYT_INTERVAL. |
7b2d99fa | 170 | * |
ce991981 YG |
171 | * TODO: These constraints can be improved with proper rules. |
172 | * Currently apply LCM of SYT_INTERVALs. | |
7b2d99fa TS |
173 | */ |
174 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
175 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32); | |
176 | if (err < 0) | |
177 | goto end; | |
178 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
179 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32); | |
180 | end: | |
181 | return err; | |
182 | } | |
183 | EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); | |
184 | ||
31ef9134 | 185 | /** |
be4a2894 TS |
186 | * amdtp_stream_set_parameters - set stream parameters |
187 | * @s: the AMDTP stream to configure | |
31ef9134 | 188 | * @rate: the sample rate |
a7304e3b CL |
189 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
190 | * as AM824 multi-bit linear audio | |
191 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 192 | * |
a7304e3b | 193 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
194 | * changed while the stream is running. |
195 | */ | |
be4a2894 TS |
196 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
197 | unsigned int rate, | |
198 | unsigned int pcm_channels, | |
199 | unsigned int midi_ports) | |
31ef9134 | 200 | { |
77d2a8a4 | 201 | unsigned int i, sfc, midi_channels; |
31ef9134 | 202 | |
83d8d72d TS |
203 | midi_channels = DIV_ROUND_UP(midi_ports, 8); |
204 | ||
77d2a8a4 TS |
205 | if (WARN_ON(amdtp_stream_running(s)) | |
206 | WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) | | |
83d8d72d | 207 | WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI)) |
31ef9134 CL |
208 | return; |
209 | ||
f9503a68 | 210 | for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) |
1017abed | 211 | if (amdtp_rate_table[sfc] == rate) |
e84d15f6 | 212 | goto sfc_found; |
31ef9134 | 213 | WARN_ON(1); |
e84d15f6 CL |
214 | return; |
215 | ||
216 | sfc_found: | |
10550bea | 217 | s->pcm_channels = pcm_channels; |
e84d15f6 | 218 | s->sfc = sfc; |
77d2a8a4 | 219 | s->data_block_quadlets = s->pcm_channels + midi_channels; |
a7304e3b CL |
220 | s->midi_ports = midi_ports; |
221 | ||
222 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
223 | |
224 | /* default buffering in the device */ | |
225 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
226 | if (s->flags & CIP_BLOCKING) | |
227 | /* additional buffering needed to adjust for no-data packets */ | |
228 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
77d2a8a4 TS |
229 | |
230 | /* init the position map for PCM and MIDI channels */ | |
231 | for (i = 0; i < pcm_channels; i++) | |
232 | s->pcm_positions[i] = i; | |
233 | s->midi_position = s->pcm_channels; | |
25ca917c CL |
234 | |
235 | /* | |
236 | * We do not know the actual MIDI FIFO size of most devices. Just | |
237 | * assume two bytes, i.e., one byte can be received over the bus while | |
238 | * the previous one is transmitted over MIDI. | |
239 | * (The value here is adjusted for midi_ratelimit_per_packet().) | |
240 | */ | |
241 | s->midi_fifo_limit = rate - MIDI_BYTES_PER_SECOND * s->syt_interval + 1; | |
31ef9134 | 242 | } |
be4a2894 | 243 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
244 | |
245 | /** | |
be4a2894 TS |
246 | * amdtp_stream_get_max_payload - get the stream's packet size |
247 | * @s: the AMDTP stream | |
31ef9134 CL |
248 | * |
249 | * This function must not be called before the stream has been configured | |
be4a2894 | 250 | * with amdtp_stream_set_parameters(). |
31ef9134 | 251 | */ |
be4a2894 | 252 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 253 | { |
a2064710 TS |
254 | unsigned int multiplier = 1; |
255 | ||
256 | if (s->flags & CIP_JUMBO_PAYLOAD) | |
257 | multiplier = 5; | |
258 | ||
259 | return 8 + s->syt_interval * s->data_block_quadlets * 4 * multiplier; | |
31ef9134 | 260 | } |
be4a2894 | 261 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 262 | |
be4a2894 | 263 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
264 | struct snd_pcm_substream *pcm, |
265 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 266 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
267 | struct snd_pcm_substream *pcm, |
268 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
269 | static void amdtp_read_s32(struct amdtp_stream *s, |
270 | struct snd_pcm_substream *pcm, | |
271 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
272 | |
273 | /** | |
be4a2894 TS |
274 | * amdtp_stream_set_pcm_format - set the PCM format |
275 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
276 | * @format: the format of the ALSA PCM device |
277 | * | |
ce991981 | 278 | * The sample format must be set after the other parameters (rate/PCM channels/ |
a7304e3b CL |
279 | * MIDI) and before the stream is started, and must not be changed while the |
280 | * stream is running. | |
31ef9134 | 281 | */ |
be4a2894 TS |
282 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
283 | snd_pcm_format_t format) | |
31ef9134 | 284 | { |
83d8d72d | 285 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
286 | return; |
287 | ||
288 | switch (format) { | |
289 | default: | |
290 | WARN_ON(1); | |
291 | /* fall through */ | |
292 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 | 293 | if (s->direction == AMDTP_OUT_STREAM) { |
10550bea | 294 | s->transfer_samples = amdtp_write_s16; |
2b3fc456 TS |
295 | break; |
296 | } | |
297 | WARN_ON(1); | |
298 | /* fall through */ | |
31ef9134 | 299 | case SNDRV_PCM_FORMAT_S32: |
10550bea TS |
300 | if (s->direction == AMDTP_OUT_STREAM) |
301 | s->transfer_samples = amdtp_write_s32; | |
302 | else | |
303 | s->transfer_samples = amdtp_read_s32; | |
31ef9134 CL |
304 | break; |
305 | } | |
306 | } | |
be4a2894 | 307 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 308 | |
76fb8789 | 309 | /** |
be4a2894 TS |
310 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
311 | * @s: the AMDTP stream | |
76fb8789 CL |
312 | * |
313 | * This function should be called from the PCM device's .prepare callback. | |
314 | */ | |
be4a2894 | 315 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
316 | { |
317 | tasklet_kill(&s->period_tasklet); | |
318 | s->pcm_buffer_pointer = 0; | |
319 | s->pcm_period_pointer = 0; | |
92b862c7 | 320 | s->pointer_flush = true; |
76fb8789 | 321 | } |
be4a2894 | 322 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 323 | |
875be091 TS |
324 | static unsigned int calculate_data_blocks(struct amdtp_stream *s, |
325 | unsigned int syt) | |
31ef9134 CL |
326 | { |
327 | unsigned int phase, data_blocks; | |
328 | ||
875be091 TS |
329 | /* Blocking mode. */ |
330 | if (s->flags & CIP_BLOCKING) { | |
331 | /* This module generate empty packet for 'no data'. */ | |
332 | if (syt == CIP_SYT_NO_INFO) | |
333 | data_blocks = 0; | |
334 | else | |
335 | data_blocks = s->syt_interval; | |
336 | /* Non-blocking mode. */ | |
31ef9134 | 337 | } else { |
875be091 TS |
338 | if (!cip_sfc_is_base_44100(s->sfc)) { |
339 | /* Sample_rate / 8000 is an integer, and precomputed. */ | |
340 | data_blocks = s->data_block_state; | |
341 | } else { | |
342 | phase = s->data_block_state; | |
31ef9134 CL |
343 | |
344 | /* | |
345 | * This calculates the number of data blocks per packet so that | |
346 | * 1) the overall rate is correct and exactly synchronized to | |
347 | * the bus clock, and | |
348 | * 2) packets with a rounded-up number of blocks occur as early | |
349 | * as possible in the sequence (to prevent underruns of the | |
350 | * device's buffer). | |
351 | */ | |
875be091 TS |
352 | if (s->sfc == CIP_SFC_44100) |
353 | /* 6 6 5 6 5 6 5 ... */ | |
354 | data_blocks = 5 + ((phase & 1) ^ | |
355 | (phase == 0 || phase >= 40)); | |
356 | else | |
357 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
358 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
359 | if (++phase >= (80 >> (s->sfc >> 1))) | |
360 | phase = 0; | |
361 | s->data_block_state = phase; | |
362 | } | |
31ef9134 CL |
363 | } |
364 | ||
365 | return data_blocks; | |
366 | } | |
367 | ||
be4a2894 | 368 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
369 | unsigned int cycle) |
370 | { | |
371 | unsigned int syt_offset, phase, index, syt; | |
372 | ||
373 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
374 | if (!cip_sfc_is_base_44100(s->sfc)) | |
375 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
376 | else { | |
377 | /* | |
378 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
379 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
380 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
381 | * elements is about 1386.23. Rounding the results of this | |
382 | * formula to the SYT precision results in a sequence of | |
383 | * differences that begins with: | |
384 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
385 | * This code generates _exactly_ the same sequence. | |
386 | */ | |
387 | phase = s->syt_offset_state; | |
388 | index = phase % 13; | |
389 | syt_offset = s->last_syt_offset; | |
390 | syt_offset += 1386 + ((index && !(index & 3)) || | |
391 | phase == 146); | |
392 | if (++phase >= 147) | |
393 | phase = 0; | |
394 | s->syt_offset_state = phase; | |
395 | } | |
396 | } else | |
397 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
398 | s->last_syt_offset = syt_offset; | |
399 | ||
be454366 | 400 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 401 | syt_offset += s->transfer_delay; |
be454366 CL |
402 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
403 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 404 | |
b445db44 | 405 | return syt & CIP_SYT_MASK; |
be454366 | 406 | } else { |
b445db44 | 407 | return CIP_SYT_NO_INFO; |
be454366 | 408 | } |
31ef9134 CL |
409 | } |
410 | ||
be4a2894 | 411 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
412 | struct snd_pcm_substream *pcm, |
413 | __be32 *buffer, unsigned int frames) | |
414 | { | |
415 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 416 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
417 | const u32 *src; |
418 | ||
419 | channels = s->pcm_channels; | |
420 | src = (void *)runtime->dma_area + | |
e84841f9 | 421 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 422 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
423 | |
424 | for (i = 0; i < frames; ++i) { | |
425 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
426 | buffer[s->pcm_positions[c]] = |
427 | cpu_to_be32((*src >> 8) | 0x40000000); | |
31ef9134 | 428 | src++; |
31ef9134 | 429 | } |
77d2a8a4 | 430 | buffer += s->data_block_quadlets; |
31ef9134 CL |
431 | if (--remaining_frames == 0) |
432 | src = (void *)runtime->dma_area; | |
433 | } | |
434 | } | |
435 | ||
be4a2894 | 436 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
437 | struct snd_pcm_substream *pcm, |
438 | __be32 *buffer, unsigned int frames) | |
439 | { | |
440 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 441 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
442 | const u16 *src; |
443 | ||
444 | channels = s->pcm_channels; | |
445 | src = (void *)runtime->dma_area + | |
e84841f9 | 446 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 447 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
448 | |
449 | for (i = 0; i < frames; ++i) { | |
450 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 451 | buffer[s->pcm_positions[c]] = |
a6975f2a | 452 | cpu_to_be32((*src << 8) | 0x42000000); |
31ef9134 | 453 | src++; |
31ef9134 | 454 | } |
77d2a8a4 | 455 | buffer += s->data_block_quadlets; |
31ef9134 CL |
456 | if (--remaining_frames == 0) |
457 | src = (void *)runtime->dma_area; | |
458 | } | |
459 | } | |
460 | ||
2b3fc456 TS |
461 | static void amdtp_read_s32(struct amdtp_stream *s, |
462 | struct snd_pcm_substream *pcm, | |
463 | __be32 *buffer, unsigned int frames) | |
464 | { | |
465 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
466 | unsigned int channels, remaining_frames, i, c; | |
467 | u32 *dst; | |
468 | ||
469 | channels = s->pcm_channels; | |
470 | dst = (void *)runtime->dma_area + | |
471 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
472 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
473 | ||
474 | for (i = 0; i < frames; ++i) { | |
475 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 476 | *dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8; |
2b3fc456 TS |
477 | dst++; |
478 | } | |
479 | buffer += s->data_block_quadlets; | |
480 | if (--remaining_frames == 0) | |
481 | dst = (void *)runtime->dma_area; | |
482 | } | |
483 | } | |
484 | ||
be4a2894 | 485 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
486 | __be32 *buffer, unsigned int frames) |
487 | { | |
488 | unsigned int i, c; | |
489 | ||
490 | for (i = 0; i < frames; ++i) { | |
491 | for (c = 0; c < s->pcm_channels; ++c) | |
77d2a8a4 | 492 | buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000); |
31ef9134 CL |
493 | buffer += s->data_block_quadlets; |
494 | } | |
495 | } | |
496 | ||
25ca917c CL |
497 | /* |
498 | * To avoid sending MIDI bytes at too high a rate, assume that the receiving | |
499 | * device has a FIFO, and track how much it is filled. This values increases | |
500 | * by one whenever we send one byte in a packet, but the FIFO empties at | |
501 | * a constant rate independent of our packet rate. One packet has syt_interval | |
502 | * samples, so the number of bytes that empty out of the FIFO, per packet(!), | |
503 | * is MIDI_BYTES_PER_SECOND * syt_interval / sample_rate. To avoid storing | |
504 | * fractional values, the values in midi_fifo_used[] are measured in bytes | |
505 | * multiplied by the sample rate. | |
506 | */ | |
507 | static bool midi_ratelimit_per_packet(struct amdtp_stream *s, unsigned int port) | |
508 | { | |
509 | int used; | |
510 | ||
511 | used = s->midi_fifo_used[port]; | |
512 | if (used == 0) /* common shortcut */ | |
513 | return true; | |
514 | ||
515 | used -= MIDI_BYTES_PER_SECOND * s->syt_interval; | |
516 | used = max(used, 0); | |
517 | s->midi_fifo_used[port] = used; | |
518 | ||
519 | return used < s->midi_fifo_limit; | |
520 | } | |
521 | ||
522 | static void midi_rate_use_one_byte(struct amdtp_stream *s, unsigned int port) | |
523 | { | |
524 | s->midi_fifo_used[port] += amdtp_rate_table[s->sfc]; | |
525 | } | |
526 | ||
be4a2894 | 527 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
528 | __be32 *buffer, unsigned int frames) |
529 | { | |
83d8d72d TS |
530 | unsigned int f, port; |
531 | u8 *b; | |
532 | ||
533 | for (f = 0; f < frames; f++) { | |
77d2a8a4 | 534 | b = (u8 *)&buffer[s->midi_position]; |
83d8d72d TS |
535 | |
536 | port = (s->data_block_counter + f) % 8; | |
25ca917c CL |
537 | if (f < MAX_MIDI_RX_BLOCKS && |
538 | midi_ratelimit_per_packet(s, port) && | |
539 | s->midi[port] != NULL && | |
540 | snd_rawmidi_transmit(s->midi[port], &b[1], 1) == 1) { | |
541 | midi_rate_use_one_byte(s, port); | |
83d8d72d | 542 | b[0] = 0x81; |
25ca917c CL |
543 | } else { |
544 | b[0] = 0x80; | |
545 | b[1] = 0; | |
546 | } | |
547 | b[2] = 0; | |
548 | b[3] = 0; | |
83d8d72d TS |
549 | |
550 | buffer += s->data_block_quadlets; | |
551 | } | |
552 | } | |
553 | ||
554 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
555 | __be32 *buffer, unsigned int frames) | |
556 | { | |
557 | unsigned int f, port; | |
558 | int len; | |
559 | u8 *b; | |
560 | ||
561 | for (f = 0; f < frames; f++) { | |
562 | port = (s->data_block_counter + f) % 8; | |
77d2a8a4 | 563 | b = (u8 *)&buffer[s->midi_position]; |
31ef9134 | 564 | |
83d8d72d TS |
565 | len = b[0] - 0x80; |
566 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
567 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
568 | ||
569 | buffer += s->data_block_quadlets; | |
570 | } | |
31ef9134 CL |
571 | } |
572 | ||
4b7da117 TS |
573 | static void update_pcm_pointers(struct amdtp_stream *s, |
574 | struct snd_pcm_substream *pcm, | |
575 | unsigned int frames) | |
65845f29 TS |
576 | { |
577 | unsigned int ptr; | |
578 | ||
579 | /* | |
580 | * In IEC 61883-6, one data block represents one event. In ALSA, one | |
581 | * event equals to one PCM frame. But Dice has a quirk to transfer | |
582 | * two PCM frames in one data block. | |
583 | */ | |
584 | if (s->double_pcm_frames) | |
585 | frames *= 2; | |
4b7da117 | 586 | |
4b7da117 TS |
587 | ptr = s->pcm_buffer_pointer + frames; |
588 | if (ptr >= pcm->runtime->buffer_size) | |
589 | ptr -= pcm->runtime->buffer_size; | |
590 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
591 | ||
592 | s->pcm_period_pointer += frames; | |
593 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
594 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
595 | s->pointer_flush = false; | |
596 | tasklet_hi_schedule(&s->period_tasklet); | |
597 | } | |
598 | } | |
599 | ||
600 | static void pcm_period_tasklet(unsigned long data) | |
601 | { | |
602 | struct amdtp_stream *s = (void *)data; | |
603 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
604 | ||
605 | if (pcm) | |
606 | snd_pcm_period_elapsed(pcm); | |
607 | } | |
608 | ||
609 | static int queue_packet(struct amdtp_stream *s, | |
610 | unsigned int header_length, | |
611 | unsigned int payload_length, bool skip) | |
612 | { | |
613 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
614 | int err = 0; |
615 | ||
616 | if (IS_ERR(s->context)) | |
617 | goto end; | |
4b7da117 TS |
618 | |
619 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
620 | p.tag = TAG_CIP; | |
621 | p.header_length = header_length; | |
622 | p.payload_length = (!skip) ? payload_length : 0; | |
623 | p.skip = skip; | |
624 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
625 | s->buffer.packets[s->packet_index].offset); | |
626 | if (err < 0) { | |
627 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
628 | goto end; | |
629 | } | |
630 | ||
631 | if (++s->packet_index >= QUEUE_LENGTH) | |
632 | s->packet_index = 0; | |
633 | end: | |
634 | return err; | |
635 | } | |
636 | ||
637 | static inline int queue_out_packet(struct amdtp_stream *s, | |
638 | unsigned int payload_length, bool skip) | |
639 | { | |
640 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
641 | payload_length, skip); | |
642 | } | |
643 | ||
2b3fc456 TS |
644 | static inline int queue_in_packet(struct amdtp_stream *s) |
645 | { | |
646 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
647 | amdtp_stream_get_max_payload(s), false); | |
648 | } | |
649 | ||
ccccad86 | 650 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
651 | { |
652 | __be32 *buffer; | |
ccccad86 | 653 | unsigned int data_blocks, payload_length; |
31ef9134 | 654 | struct snd_pcm_substream *pcm; |
31ef9134 | 655 | |
ec00f5e4 CL |
656 | if (s->packet_index < 0) |
657 | return; | |
ec00f5e4 | 658 | |
875be091 | 659 | data_blocks = calculate_data_blocks(s, syt); |
31ef9134 | 660 | |
ccccad86 | 661 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 662 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 663 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
664 | s->data_block_counter); |
665 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 666 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
667 | buffer += 2; |
668 | ||
669 | pcm = ACCESS_ONCE(s->pcm); | |
670 | if (pcm) | |
671 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
672 | else | |
673 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
674 | if (s->midi_ports) | |
675 | amdtp_fill_midi(s, buffer, data_blocks); | |
676 | ||
677 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
678 | ||
4b7da117 TS |
679 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
680 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 681 | s->packet_index = -1; |
be4a2894 | 682 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
683 | return; |
684 | } | |
31ef9134 | 685 | |
76fb8789 | 686 | if (pcm) |
4b7da117 | 687 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
688 | } |
689 | ||
2b3fc456 TS |
690 | static void handle_in_packet(struct amdtp_stream *s, |
691 | unsigned int payload_quadlets, | |
692 | __be32 *buffer) | |
693 | { | |
694 | u32 cip_header[2]; | |
d9cd0065 TS |
695 | unsigned int data_blocks, data_block_quadlets, data_block_counter, |
696 | dbc_interval; | |
2b3fc456 | 697 | struct snd_pcm_substream *pcm = NULL; |
c8bdf49b | 698 | bool lost; |
2b3fc456 TS |
699 | |
700 | cip_header[0] = be32_to_cpu(buffer[0]); | |
701 | cip_header[1] = be32_to_cpu(buffer[1]); | |
702 | ||
703 | /* | |
704 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 705 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 TS |
706 | */ |
707 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
708 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
709 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
710 | dev_info_ratelimited(&s->unit->device, | |
711 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
712 | cip_header[0], cip_header[1]); | |
713 | goto end; | |
714 | } | |
715 | ||
716 | /* Calculate data blocks */ | |
717 | if (payload_quadlets < 3 || | |
718 | ((cip_header[1] & CIP_FDF_MASK) == | |
719 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
720 | data_blocks = 0; | |
721 | } else { | |
722 | data_block_quadlets = | |
723 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
724 | /* avoid division by zero */ | |
725 | if (data_block_quadlets == 0) { | |
726 | dev_info_ratelimited(&s->unit->device, | |
727 | "Detect invalid value in dbs field: %08X\n", | |
728 | cip_header[0]); | |
729 | goto err; | |
730 | } | |
69702239 TS |
731 | if (s->flags & CIP_WRONG_DBS) |
732 | data_block_quadlets = s->data_block_quadlets; | |
2b3fc456 TS |
733 | |
734 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
735 | } | |
736 | ||
737 | /* Check data block counter continuity */ | |
738 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
9d59124c TS |
739 | if (data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && |
740 | s->data_block_counter != UINT_MAX) | |
741 | data_block_counter = s->data_block_counter; | |
742 | ||
b6bc8123 TS |
743 | if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) && data_block_counter == 0) || |
744 | (s->data_block_counter == UINT_MAX)) { | |
b84b1a27 TS |
745 | lost = false; |
746 | } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { | |
c8bdf49b | 747 | lost = data_block_counter != s->data_block_counter; |
d9cd0065 TS |
748 | } else { |
749 | if ((data_blocks > 0) && (s->tx_dbc_interval > 0)) | |
750 | dbc_interval = s->tx_dbc_interval; | |
751 | else | |
752 | dbc_interval = data_blocks; | |
753 | ||
c8bdf49b | 754 | lost = data_block_counter != |
d9cd0065 TS |
755 | ((s->data_block_counter + dbc_interval) & 0xff); |
756 | } | |
c8bdf49b TS |
757 | |
758 | if (lost) { | |
2b3fc456 TS |
759 | dev_info(&s->unit->device, |
760 | "Detect discontinuity of CIP: %02X %02X\n", | |
761 | s->data_block_counter, data_block_counter); | |
762 | goto err; | |
763 | } | |
764 | ||
765 | if (data_blocks > 0) { | |
766 | buffer += 2; | |
767 | ||
768 | pcm = ACCESS_ONCE(s->pcm); | |
769 | if (pcm) | |
770 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
771 | |
772 | if (s->midi_ports) | |
773 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
774 | } |
775 | ||
c8bdf49b TS |
776 | if (s->flags & CIP_DBC_IS_END_EVENT) |
777 | s->data_block_counter = data_block_counter; | |
778 | else | |
779 | s->data_block_counter = | |
780 | (data_block_counter + data_blocks) & 0xff; | |
2b3fc456 TS |
781 | end: |
782 | if (queue_in_packet(s) < 0) | |
783 | goto err; | |
784 | ||
785 | if (pcm) | |
786 | update_pcm_pointers(s, pcm, data_blocks); | |
787 | ||
788 | return; | |
789 | err: | |
790 | s->packet_index = -1; | |
791 | amdtp_stream_pcm_abort(s); | |
792 | } | |
793 | ||
4b7da117 TS |
794 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
795 | size_t header_length, void *header, | |
796 | void *private_data) | |
31ef9134 | 797 | { |
be4a2894 | 798 | struct amdtp_stream *s = private_data; |
ccccad86 | 799 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
800 | |
801 | /* | |
802 | * Compute the cycle of the last queued packet. | |
803 | * (We need only the four lowest bits for the SYT, so we can ignore | |
804 | * that bits 0-11 must wrap around at 3072.) | |
805 | */ | |
806 | cycle += QUEUE_LENGTH - packets; | |
807 | ||
ccccad86 TS |
808 | for (i = 0; i < packets; ++i) { |
809 | syt = calculate_syt(s, ++cycle); | |
810 | handle_out_packet(s, syt); | |
811 | } | |
13882a82 | 812 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
813 | } |
814 | ||
2b3fc456 TS |
815 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
816 | size_t header_length, void *header, | |
817 | void *private_data) | |
818 | { | |
819 | struct amdtp_stream *s = private_data; | |
a2064710 TS |
820 | unsigned int p, syt, packets; |
821 | unsigned int payload_quadlets, max_payload_quadlets; | |
2b3fc456 TS |
822 | __be32 *buffer, *headers = header; |
823 | ||
824 | /* The number of packets in buffer */ | |
825 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
826 | ||
a2064710 TS |
827 | /* For buffer-over-run prevention. */ |
828 | max_payload_quadlets = amdtp_stream_get_max_payload(s) / 4; | |
829 | ||
2b3fc456 TS |
830 | for (p = 0; p < packets; p++) { |
831 | if (s->packet_index < 0) | |
7b3b0d85 TS |
832 | break; |
833 | ||
2b3fc456 TS |
834 | buffer = s->buffer.packets[s->packet_index].buffer; |
835 | ||
7b3b0d85 TS |
836 | /* Process sync slave stream */ |
837 | if (s->sync_slave && s->sync_slave->callbacked) { | |
838 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
839 | handle_out_packet(s->sync_slave, syt); | |
840 | } | |
841 | ||
2b3fc456 TS |
842 | /* The number of quadlets in this packet */ |
843 | payload_quadlets = | |
844 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
a2064710 TS |
845 | if (payload_quadlets > max_payload_quadlets) { |
846 | dev_err(&s->unit->device, | |
847 | "Detect jumbo payload: %02x %02x\n", | |
848 | payload_quadlets, max_payload_quadlets); | |
849 | s->packet_index = -1; | |
850 | break; | |
851 | } | |
852 | ||
2b3fc456 TS |
853 | handle_in_packet(s, payload_quadlets, buffer); |
854 | } | |
855 | ||
7b3b0d85 TS |
856 | /* Queueing error or detecting discontinuity */ |
857 | if (s->packet_index < 0) { | |
858 | /* Abort sync slave. */ | |
859 | if (s->sync_slave) { | |
860 | s->sync_slave->packet_index = -1; | |
861 | amdtp_stream_pcm_abort(s->sync_slave); | |
862 | } | |
863 | return; | |
864 | } | |
865 | ||
866 | /* when sync to device, flush the packets for slave stream */ | |
867 | if (s->sync_slave && s->sync_slave->callbacked) | |
868 | fw_iso_context_queue_flush(s->sync_slave->context); | |
869 | ||
2b3fc456 TS |
870 | fw_iso_context_queue_flush(s->context); |
871 | } | |
872 | ||
7b3b0d85 TS |
873 | /* processing is done by master callback */ |
874 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
875 | size_t header_length, void *header, | |
876 | void *private_data) | |
877 | { | |
878 | return; | |
879 | } | |
880 | ||
881 | /* this is executed one time */ | |
882 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
883 | u32 cycle, size_t header_length, | |
884 | void *header, void *private_data) | |
885 | { | |
886 | struct amdtp_stream *s = private_data; | |
887 | ||
888 | /* | |
889 | * For in-stream, first packet has come. | |
890 | * For out-stream, prepared to transmit first packet | |
891 | */ | |
892 | s->callbacked = true; | |
893 | wake_up(&s->callback_wait); | |
894 | ||
895 | if (s->direction == AMDTP_IN_STREAM) | |
896 | context->callback.sc = in_stream_callback; | |
897 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
898 | context->callback.sc = slave_stream_callback; | |
899 | else | |
900 | context->callback.sc = out_stream_callback; | |
901 | ||
902 | context->callback.sc(context, cycle, header_length, header, s); | |
903 | } | |
904 | ||
31ef9134 | 905 | /** |
be4a2894 TS |
906 | * amdtp_stream_start - start transferring packets |
907 | * @s: the AMDTP stream to start | |
31ef9134 CL |
908 | * @channel: the isochronous channel on the bus |
909 | * @speed: firewire speed code | |
910 | * | |
911 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
912 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
913 | * device can be started. | |
31ef9134 | 914 | */ |
be4a2894 | 915 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
916 | { |
917 | static const struct { | |
918 | unsigned int data_block; | |
919 | unsigned int syt_offset; | |
920 | } initial_state[] = { | |
921 | [CIP_SFC_32000] = { 4, 3072 }, | |
922 | [CIP_SFC_48000] = { 6, 1024 }, | |
923 | [CIP_SFC_96000] = { 12, 1024 }, | |
924 | [CIP_SFC_192000] = { 24, 1024 }, | |
925 | [CIP_SFC_44100] = { 0, 67 }, | |
926 | [CIP_SFC_88200] = { 0, 67 }, | |
927 | [CIP_SFC_176400] = { 0, 67 }, | |
928 | }; | |
2b3fc456 TS |
929 | unsigned int header_size; |
930 | enum dma_data_direction dir; | |
7ab56645 | 931 | int type, tag, err; |
31ef9134 CL |
932 | |
933 | mutex_lock(&s->mutex); | |
934 | ||
be4a2894 | 935 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 936 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
937 | err = -EBADFD; |
938 | goto err_unlock; | |
939 | } | |
940 | ||
b6bc8123 TS |
941 | if (s->direction == AMDTP_IN_STREAM && |
942 | s->flags & CIP_SKIP_INIT_DBC_CHECK) | |
943 | s->data_block_counter = UINT_MAX; | |
944 | else | |
945 | s->data_block_counter = 0; | |
31ef9134 CL |
946 | s->data_block_state = initial_state[s->sfc].data_block; |
947 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
948 | s->last_syt_offset = TICKS_PER_CYCLE; | |
949 | ||
2b3fc456 TS |
950 | /* initialize packet buffer */ |
951 | if (s->direction == AMDTP_IN_STREAM) { | |
952 | dir = DMA_FROM_DEVICE; | |
953 | type = FW_ISO_CONTEXT_RECEIVE; | |
954 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
955 | } else { |
956 | dir = DMA_TO_DEVICE; | |
957 | type = FW_ISO_CONTEXT_TRANSMIT; | |
958 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 959 | } |
31ef9134 | 960 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 961 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
962 | if (err < 0) |
963 | goto err_unlock; | |
964 | ||
965 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 966 | type, channel, speed, header_size, |
7b3b0d85 | 967 | amdtp_stream_first_callback, s); |
31ef9134 CL |
968 | if (IS_ERR(s->context)) { |
969 | err = PTR_ERR(s->context); | |
970 | if (err == -EBUSY) | |
971 | dev_err(&s->unit->device, | |
be4a2894 | 972 | "no free stream on this controller\n"); |
31ef9134 CL |
973 | goto err_buffer; |
974 | } | |
975 | ||
be4a2894 | 976 | amdtp_stream_update(s); |
31ef9134 | 977 | |
ec00f5e4 | 978 | s->packet_index = 0; |
4b7da117 | 979 | do { |
2b3fc456 TS |
980 | if (s->direction == AMDTP_IN_STREAM) |
981 | err = queue_in_packet(s); | |
982 | else | |
983 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
984 | if (err < 0) |
985 | goto err_context; | |
986 | } while (s->packet_index > 0); | |
31ef9134 | 987 | |
2b3fc456 | 988 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7ab56645 TS |
989 | tag = FW_ISO_CONTEXT_MATCH_TAG1; |
990 | if (s->flags & CIP_EMPTY_WITH_TAG0) | |
991 | tag |= FW_ISO_CONTEXT_MATCH_TAG0; | |
992 | ||
7b3b0d85 | 993 | s->callbacked = false; |
7ab56645 | 994 | err = fw_iso_context_start(s->context, -1, 0, tag); |
31ef9134 CL |
995 | if (err < 0) |
996 | goto err_context; | |
997 | ||
998 | mutex_unlock(&s->mutex); | |
999 | ||
1000 | return 0; | |
1001 | ||
1002 | err_context: | |
1003 | fw_iso_context_destroy(s->context); | |
1004 | s->context = ERR_PTR(-1); | |
1005 | err_buffer: | |
1006 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
1007 | err_unlock: | |
1008 | mutex_unlock(&s->mutex); | |
1009 | ||
1010 | return err; | |
1011 | } | |
be4a2894 | 1012 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 1013 | |
e9148ddd | 1014 | /** |
be4a2894 TS |
1015 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
1016 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
1017 | * |
1018 | * Returns the current buffer position, in frames. | |
1019 | */ | |
be4a2894 | 1020 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 1021 | { |
92b862c7 | 1022 | /* this optimization is allowed to be racy */ |
c8de6dbb | 1023 | if (s->pointer_flush && amdtp_stream_running(s)) |
92b862c7 CL |
1024 | fw_iso_context_flush_completions(s->context); |
1025 | else | |
1026 | s->pointer_flush = true; | |
e9148ddd CL |
1027 | |
1028 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
1029 | } | |
be4a2894 | 1030 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 1031 | |
31ef9134 | 1032 | /** |
be4a2894 TS |
1033 | * amdtp_stream_update - update the stream after a bus reset |
1034 | * @s: the AMDTP stream | |
31ef9134 | 1035 | */ |
be4a2894 | 1036 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
1037 | { |
1038 | ACCESS_ONCE(s->source_node_id_field) = | |
1039 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
1040 | } | |
be4a2894 | 1041 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
1042 | |
1043 | /** | |
be4a2894 TS |
1044 | * amdtp_stream_stop - stop sending packets |
1045 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
1046 | * |
1047 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
1048 | * itself can be stopped. | |
1049 | */ | |
be4a2894 | 1050 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
1051 | { |
1052 | mutex_lock(&s->mutex); | |
1053 | ||
be4a2894 | 1054 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
1055 | mutex_unlock(&s->mutex); |
1056 | return; | |
1057 | } | |
1058 | ||
76fb8789 | 1059 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
1060 | fw_iso_context_stop(s->context); |
1061 | fw_iso_context_destroy(s->context); | |
1062 | s->context = ERR_PTR(-1); | |
1063 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
1064 | ||
7b3b0d85 TS |
1065 | s->callbacked = false; |
1066 | ||
31ef9134 CL |
1067 | mutex_unlock(&s->mutex); |
1068 | } | |
be4a2894 | 1069 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
1070 | |
1071 | /** | |
be4a2894 | 1072 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
1073 | * @s: the AMDTP stream about to be stopped |
1074 | * | |
1075 | * If the isochronous stream needs to be stopped asynchronously, call this | |
1076 | * function first to stop the PCM device. | |
1077 | */ | |
be4a2894 | 1078 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
1079 | { |
1080 | struct snd_pcm_substream *pcm; | |
1081 | ||
1082 | pcm = ACCESS_ONCE(s->pcm); | |
1fb8510c TI |
1083 | if (pcm) |
1084 | snd_pcm_stop_xrun(pcm); | |
31ef9134 | 1085 | } |
be4a2894 | 1086 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |