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 | { |
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 | |
169 | * preferrable to aligh period/buffer sizes to current SYT_INTERVAL. | |
170 | * | |
171 | * TODO: These constraints can be improved with propper rules. | |
172 | * Currently apply LCM of SYT_INTEVALs. | |
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 | { |
e84d15f6 | 254 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 255 | } |
be4a2894 | 256 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 257 | |
be4a2894 | 258 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
259 | struct snd_pcm_substream *pcm, |
260 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 261 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
262 | struct snd_pcm_substream *pcm, |
263 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
264 | static void amdtp_read_s32(struct amdtp_stream *s, |
265 | struct snd_pcm_substream *pcm, | |
266 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
267 | |
268 | /** | |
be4a2894 TS |
269 | * amdtp_stream_set_pcm_format - set the PCM format |
270 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
271 | * @format: the format of the ALSA PCM device |
272 | * | |
a7304e3b CL |
273 | * The sample format must be set after the other paramters (rate/PCM channels/ |
274 | * MIDI) and before the stream is started, and must not be changed while the | |
275 | * stream is running. | |
31ef9134 | 276 | */ |
be4a2894 TS |
277 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
278 | snd_pcm_format_t format) | |
31ef9134 | 279 | { |
83d8d72d | 280 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
281 | return; |
282 | ||
283 | switch (format) { | |
284 | default: | |
285 | WARN_ON(1); | |
286 | /* fall through */ | |
287 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 | 288 | if (s->direction == AMDTP_OUT_STREAM) { |
10550bea | 289 | s->transfer_samples = amdtp_write_s16; |
2b3fc456 TS |
290 | break; |
291 | } | |
292 | WARN_ON(1); | |
293 | /* fall through */ | |
31ef9134 | 294 | case SNDRV_PCM_FORMAT_S32: |
10550bea TS |
295 | if (s->direction == AMDTP_OUT_STREAM) |
296 | s->transfer_samples = amdtp_write_s32; | |
297 | else | |
298 | s->transfer_samples = amdtp_read_s32; | |
31ef9134 CL |
299 | break; |
300 | } | |
301 | } | |
be4a2894 | 302 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 303 | |
76fb8789 | 304 | /** |
be4a2894 TS |
305 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
306 | * @s: the AMDTP stream | |
76fb8789 CL |
307 | * |
308 | * This function should be called from the PCM device's .prepare callback. | |
309 | */ | |
be4a2894 | 310 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
311 | { |
312 | tasklet_kill(&s->period_tasklet); | |
313 | s->pcm_buffer_pointer = 0; | |
314 | s->pcm_period_pointer = 0; | |
92b862c7 | 315 | s->pointer_flush = true; |
76fb8789 | 316 | } |
be4a2894 | 317 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 318 | |
be4a2894 | 319 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
320 | { |
321 | unsigned int phase, data_blocks; | |
322 | ||
ccccad86 TS |
323 | if (s->flags & CIP_BLOCKING) |
324 | data_blocks = s->syt_interval; | |
325 | else if (!cip_sfc_is_base_44100(s->sfc)) { | |
31ef9134 CL |
326 | /* Sample_rate / 8000 is an integer, and precomputed. */ |
327 | data_blocks = s->data_block_state; | |
328 | } else { | |
329 | phase = s->data_block_state; | |
330 | ||
331 | /* | |
332 | * This calculates the number of data blocks per packet so that | |
333 | * 1) the overall rate is correct and exactly synchronized to | |
334 | * the bus clock, and | |
335 | * 2) packets with a rounded-up number of blocks occur as early | |
336 | * as possible in the sequence (to prevent underruns of the | |
337 | * device's buffer). | |
338 | */ | |
339 | if (s->sfc == CIP_SFC_44100) | |
340 | /* 6 6 5 6 5 6 5 ... */ | |
341 | data_blocks = 5 + ((phase & 1) ^ | |
342 | (phase == 0 || phase >= 40)); | |
343 | else | |
344 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
345 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
346 | if (++phase >= (80 >> (s->sfc >> 1))) | |
347 | phase = 0; | |
348 | s->data_block_state = phase; | |
349 | } | |
350 | ||
351 | return data_blocks; | |
352 | } | |
353 | ||
be4a2894 | 354 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
355 | unsigned int cycle) |
356 | { | |
357 | unsigned int syt_offset, phase, index, syt; | |
358 | ||
359 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
360 | if (!cip_sfc_is_base_44100(s->sfc)) | |
361 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
362 | else { | |
363 | /* | |
364 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
365 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
366 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
367 | * elements is about 1386.23. Rounding the results of this | |
368 | * formula to the SYT precision results in a sequence of | |
369 | * differences that begins with: | |
370 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
371 | * This code generates _exactly_ the same sequence. | |
372 | */ | |
373 | phase = s->syt_offset_state; | |
374 | index = phase % 13; | |
375 | syt_offset = s->last_syt_offset; | |
376 | syt_offset += 1386 + ((index && !(index & 3)) || | |
377 | phase == 146); | |
378 | if (++phase >= 147) | |
379 | phase = 0; | |
380 | s->syt_offset_state = phase; | |
381 | } | |
382 | } else | |
383 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
384 | s->last_syt_offset = syt_offset; | |
385 | ||
be454366 | 386 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 387 | syt_offset += s->transfer_delay; |
be454366 CL |
388 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
389 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 390 | |
b445db44 | 391 | return syt & CIP_SYT_MASK; |
be454366 | 392 | } else { |
b445db44 | 393 | return CIP_SYT_NO_INFO; |
be454366 | 394 | } |
31ef9134 CL |
395 | } |
396 | ||
be4a2894 | 397 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
398 | struct snd_pcm_substream *pcm, |
399 | __be32 *buffer, unsigned int frames) | |
400 | { | |
401 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 402 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
403 | const u32 *src; |
404 | ||
405 | channels = s->pcm_channels; | |
406 | src = (void *)runtime->dma_area + | |
e84841f9 | 407 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 408 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
409 | |
410 | for (i = 0; i < frames; ++i) { | |
411 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
412 | buffer[s->pcm_positions[c]] = |
413 | cpu_to_be32((*src >> 8) | 0x40000000); | |
31ef9134 | 414 | src++; |
31ef9134 | 415 | } |
77d2a8a4 | 416 | buffer += s->data_block_quadlets; |
31ef9134 CL |
417 | if (--remaining_frames == 0) |
418 | src = (void *)runtime->dma_area; | |
419 | } | |
420 | } | |
421 | ||
be4a2894 | 422 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
423 | struct snd_pcm_substream *pcm, |
424 | __be32 *buffer, unsigned int frames) | |
425 | { | |
426 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 427 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
428 | const u16 *src; |
429 | ||
430 | channels = s->pcm_channels; | |
431 | src = (void *)runtime->dma_area + | |
e84841f9 | 432 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 433 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
434 | |
435 | for (i = 0; i < frames; ++i) { | |
436 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 437 | buffer[s->pcm_positions[c]] = |
a6975f2a | 438 | cpu_to_be32((*src << 8) | 0x42000000); |
31ef9134 | 439 | src++; |
31ef9134 | 440 | } |
77d2a8a4 | 441 | buffer += s->data_block_quadlets; |
31ef9134 CL |
442 | if (--remaining_frames == 0) |
443 | src = (void *)runtime->dma_area; | |
444 | } | |
445 | } | |
446 | ||
2b3fc456 TS |
447 | static void amdtp_read_s32(struct amdtp_stream *s, |
448 | struct snd_pcm_substream *pcm, | |
449 | __be32 *buffer, unsigned int frames) | |
450 | { | |
451 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
452 | unsigned int channels, remaining_frames, i, c; | |
453 | u32 *dst; | |
454 | ||
455 | channels = s->pcm_channels; | |
456 | dst = (void *)runtime->dma_area + | |
457 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
458 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
459 | ||
460 | for (i = 0; i < frames; ++i) { | |
461 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 462 | *dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8; |
2b3fc456 TS |
463 | dst++; |
464 | } | |
465 | buffer += s->data_block_quadlets; | |
466 | if (--remaining_frames == 0) | |
467 | dst = (void *)runtime->dma_area; | |
468 | } | |
469 | } | |
470 | ||
be4a2894 | 471 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
472 | __be32 *buffer, unsigned int frames) |
473 | { | |
474 | unsigned int i, c; | |
475 | ||
476 | for (i = 0; i < frames; ++i) { | |
477 | for (c = 0; c < s->pcm_channels; ++c) | |
77d2a8a4 | 478 | buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000); |
31ef9134 CL |
479 | buffer += s->data_block_quadlets; |
480 | } | |
481 | } | |
482 | ||
25ca917c CL |
483 | /* |
484 | * To avoid sending MIDI bytes at too high a rate, assume that the receiving | |
485 | * device has a FIFO, and track how much it is filled. This values increases | |
486 | * by one whenever we send one byte in a packet, but the FIFO empties at | |
487 | * a constant rate independent of our packet rate. One packet has syt_interval | |
488 | * samples, so the number of bytes that empty out of the FIFO, per packet(!), | |
489 | * is MIDI_BYTES_PER_SECOND * syt_interval / sample_rate. To avoid storing | |
490 | * fractional values, the values in midi_fifo_used[] are measured in bytes | |
491 | * multiplied by the sample rate. | |
492 | */ | |
493 | static bool midi_ratelimit_per_packet(struct amdtp_stream *s, unsigned int port) | |
494 | { | |
495 | int used; | |
496 | ||
497 | used = s->midi_fifo_used[port]; | |
498 | if (used == 0) /* common shortcut */ | |
499 | return true; | |
500 | ||
501 | used -= MIDI_BYTES_PER_SECOND * s->syt_interval; | |
502 | used = max(used, 0); | |
503 | s->midi_fifo_used[port] = used; | |
504 | ||
505 | return used < s->midi_fifo_limit; | |
506 | } | |
507 | ||
508 | static void midi_rate_use_one_byte(struct amdtp_stream *s, unsigned int port) | |
509 | { | |
510 | s->midi_fifo_used[port] += amdtp_rate_table[s->sfc]; | |
511 | } | |
512 | ||
be4a2894 | 513 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
514 | __be32 *buffer, unsigned int frames) |
515 | { | |
83d8d72d TS |
516 | unsigned int f, port; |
517 | u8 *b; | |
518 | ||
519 | for (f = 0; f < frames; f++) { | |
77d2a8a4 | 520 | b = (u8 *)&buffer[s->midi_position]; |
83d8d72d TS |
521 | |
522 | port = (s->data_block_counter + f) % 8; | |
25ca917c CL |
523 | if (f < MAX_MIDI_RX_BLOCKS && |
524 | midi_ratelimit_per_packet(s, port) && | |
525 | s->midi[port] != NULL && | |
526 | snd_rawmidi_transmit(s->midi[port], &b[1], 1) == 1) { | |
527 | midi_rate_use_one_byte(s, port); | |
83d8d72d | 528 | b[0] = 0x81; |
25ca917c CL |
529 | } else { |
530 | b[0] = 0x80; | |
531 | b[1] = 0; | |
532 | } | |
533 | b[2] = 0; | |
534 | b[3] = 0; | |
83d8d72d TS |
535 | |
536 | buffer += s->data_block_quadlets; | |
537 | } | |
538 | } | |
539 | ||
540 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
541 | __be32 *buffer, unsigned int frames) | |
542 | { | |
543 | unsigned int f, port; | |
544 | int len; | |
545 | u8 *b; | |
546 | ||
547 | for (f = 0; f < frames; f++) { | |
548 | port = (s->data_block_counter + f) % 8; | |
77d2a8a4 | 549 | b = (u8 *)&buffer[s->midi_position]; |
31ef9134 | 550 | |
83d8d72d TS |
551 | len = b[0] - 0x80; |
552 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
553 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
554 | ||
555 | buffer += s->data_block_quadlets; | |
556 | } | |
31ef9134 CL |
557 | } |
558 | ||
4b7da117 TS |
559 | static void update_pcm_pointers(struct amdtp_stream *s, |
560 | struct snd_pcm_substream *pcm, | |
561 | unsigned int frames) | |
65845f29 TS |
562 | { |
563 | unsigned int ptr; | |
564 | ||
565 | /* | |
566 | * In IEC 61883-6, one data block represents one event. In ALSA, one | |
567 | * event equals to one PCM frame. But Dice has a quirk to transfer | |
568 | * two PCM frames in one data block. | |
569 | */ | |
570 | if (s->double_pcm_frames) | |
571 | frames *= 2; | |
4b7da117 | 572 | |
4b7da117 TS |
573 | ptr = s->pcm_buffer_pointer + frames; |
574 | if (ptr >= pcm->runtime->buffer_size) | |
575 | ptr -= pcm->runtime->buffer_size; | |
576 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
577 | ||
578 | s->pcm_period_pointer += frames; | |
579 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
580 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
581 | s->pointer_flush = false; | |
582 | tasklet_hi_schedule(&s->period_tasklet); | |
583 | } | |
584 | } | |
585 | ||
586 | static void pcm_period_tasklet(unsigned long data) | |
587 | { | |
588 | struct amdtp_stream *s = (void *)data; | |
589 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
590 | ||
591 | if (pcm) | |
592 | snd_pcm_period_elapsed(pcm); | |
593 | } | |
594 | ||
595 | static int queue_packet(struct amdtp_stream *s, | |
596 | unsigned int header_length, | |
597 | unsigned int payload_length, bool skip) | |
598 | { | |
599 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
600 | int err = 0; |
601 | ||
602 | if (IS_ERR(s->context)) | |
603 | goto end; | |
4b7da117 TS |
604 | |
605 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
606 | p.tag = TAG_CIP; | |
607 | p.header_length = header_length; | |
608 | p.payload_length = (!skip) ? payload_length : 0; | |
609 | p.skip = skip; | |
610 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
611 | s->buffer.packets[s->packet_index].offset); | |
612 | if (err < 0) { | |
613 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
614 | goto end; | |
615 | } | |
616 | ||
617 | if (++s->packet_index >= QUEUE_LENGTH) | |
618 | s->packet_index = 0; | |
619 | end: | |
620 | return err; | |
621 | } | |
622 | ||
623 | static inline int queue_out_packet(struct amdtp_stream *s, | |
624 | unsigned int payload_length, bool skip) | |
625 | { | |
626 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
627 | payload_length, skip); | |
628 | } | |
629 | ||
2b3fc456 TS |
630 | static inline int queue_in_packet(struct amdtp_stream *s) |
631 | { | |
632 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
633 | amdtp_stream_get_max_payload(s), false); | |
634 | } | |
635 | ||
ccccad86 | 636 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
637 | { |
638 | __be32 *buffer; | |
ccccad86 | 639 | unsigned int data_blocks, payload_length; |
31ef9134 | 640 | struct snd_pcm_substream *pcm; |
31ef9134 | 641 | |
ec00f5e4 CL |
642 | if (s->packet_index < 0) |
643 | return; | |
ec00f5e4 | 644 | |
82755abf | 645 | /* this module generate empty packet for 'no data' */ |
ccccad86 | 646 | if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO)) |
e84d15f6 | 647 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
648 | else |
649 | data_blocks = 0; | |
31ef9134 | 650 | |
ccccad86 | 651 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 652 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 653 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
654 | s->data_block_counter); |
655 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 656 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
657 | buffer += 2; |
658 | ||
659 | pcm = ACCESS_ONCE(s->pcm); | |
660 | if (pcm) | |
661 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
662 | else | |
663 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
664 | if (s->midi_ports) | |
665 | amdtp_fill_midi(s, buffer, data_blocks); | |
666 | ||
667 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
668 | ||
4b7da117 TS |
669 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
670 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 671 | s->packet_index = -1; |
be4a2894 | 672 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
673 | return; |
674 | } | |
31ef9134 | 675 | |
76fb8789 | 676 | if (pcm) |
4b7da117 | 677 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
678 | } |
679 | ||
2b3fc456 TS |
680 | static void handle_in_packet(struct amdtp_stream *s, |
681 | unsigned int payload_quadlets, | |
682 | __be32 *buffer) | |
683 | { | |
684 | u32 cip_header[2]; | |
d9cd0065 TS |
685 | unsigned int data_blocks, data_block_quadlets, data_block_counter, |
686 | dbc_interval; | |
2b3fc456 | 687 | struct snd_pcm_substream *pcm = NULL; |
c8bdf49b | 688 | bool lost; |
2b3fc456 TS |
689 | |
690 | cip_header[0] = be32_to_cpu(buffer[0]); | |
691 | cip_header[1] = be32_to_cpu(buffer[1]); | |
692 | ||
693 | /* | |
694 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 695 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 TS |
696 | */ |
697 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
698 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
699 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
700 | dev_info_ratelimited(&s->unit->device, | |
701 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
702 | cip_header[0], cip_header[1]); | |
703 | goto end; | |
704 | } | |
705 | ||
706 | /* Calculate data blocks */ | |
707 | if (payload_quadlets < 3 || | |
708 | ((cip_header[1] & CIP_FDF_MASK) == | |
709 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
710 | data_blocks = 0; | |
711 | } else { | |
712 | data_block_quadlets = | |
713 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
714 | /* avoid division by zero */ | |
715 | if (data_block_quadlets == 0) { | |
716 | dev_info_ratelimited(&s->unit->device, | |
717 | "Detect invalid value in dbs field: %08X\n", | |
718 | cip_header[0]); | |
719 | goto err; | |
720 | } | |
69702239 TS |
721 | if (s->flags & CIP_WRONG_DBS) |
722 | data_block_quadlets = s->data_block_quadlets; | |
2b3fc456 TS |
723 | |
724 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
725 | } | |
726 | ||
727 | /* Check data block counter continuity */ | |
728 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
9d59124c TS |
729 | if (data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && |
730 | s->data_block_counter != UINT_MAX) | |
731 | data_block_counter = s->data_block_counter; | |
732 | ||
b6bc8123 TS |
733 | if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) && data_block_counter == 0) || |
734 | (s->data_block_counter == UINT_MAX)) { | |
b84b1a27 TS |
735 | lost = false; |
736 | } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { | |
c8bdf49b | 737 | lost = data_block_counter != s->data_block_counter; |
d9cd0065 TS |
738 | } else { |
739 | if ((data_blocks > 0) && (s->tx_dbc_interval > 0)) | |
740 | dbc_interval = s->tx_dbc_interval; | |
741 | else | |
742 | dbc_interval = data_blocks; | |
743 | ||
c8bdf49b | 744 | lost = data_block_counter != |
d9cd0065 TS |
745 | ((s->data_block_counter + dbc_interval) & 0xff); |
746 | } | |
c8bdf49b TS |
747 | |
748 | if (lost) { | |
2b3fc456 TS |
749 | dev_info(&s->unit->device, |
750 | "Detect discontinuity of CIP: %02X %02X\n", | |
751 | s->data_block_counter, data_block_counter); | |
752 | goto err; | |
753 | } | |
754 | ||
755 | if (data_blocks > 0) { | |
756 | buffer += 2; | |
757 | ||
758 | pcm = ACCESS_ONCE(s->pcm); | |
759 | if (pcm) | |
760 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
761 | |
762 | if (s->midi_ports) | |
763 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
764 | } |
765 | ||
c8bdf49b TS |
766 | if (s->flags & CIP_DBC_IS_END_EVENT) |
767 | s->data_block_counter = data_block_counter; | |
768 | else | |
769 | s->data_block_counter = | |
770 | (data_block_counter + data_blocks) & 0xff; | |
2b3fc456 TS |
771 | end: |
772 | if (queue_in_packet(s) < 0) | |
773 | goto err; | |
774 | ||
775 | if (pcm) | |
776 | update_pcm_pointers(s, pcm, data_blocks); | |
777 | ||
778 | return; | |
779 | err: | |
780 | s->packet_index = -1; | |
781 | amdtp_stream_pcm_abort(s); | |
782 | } | |
783 | ||
4b7da117 TS |
784 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
785 | size_t header_length, void *header, | |
786 | void *private_data) | |
31ef9134 | 787 | { |
be4a2894 | 788 | struct amdtp_stream *s = private_data; |
ccccad86 | 789 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
790 | |
791 | /* | |
792 | * Compute the cycle of the last queued packet. | |
793 | * (We need only the four lowest bits for the SYT, so we can ignore | |
794 | * that bits 0-11 must wrap around at 3072.) | |
795 | */ | |
796 | cycle += QUEUE_LENGTH - packets; | |
797 | ||
ccccad86 TS |
798 | for (i = 0; i < packets; ++i) { |
799 | syt = calculate_syt(s, ++cycle); | |
800 | handle_out_packet(s, syt); | |
801 | } | |
13882a82 | 802 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
803 | } |
804 | ||
2b3fc456 TS |
805 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
806 | size_t header_length, void *header, | |
807 | void *private_data) | |
808 | { | |
809 | struct amdtp_stream *s = private_data; | |
7b3b0d85 | 810 | unsigned int p, syt, packets, payload_quadlets; |
2b3fc456 TS |
811 | __be32 *buffer, *headers = header; |
812 | ||
813 | /* The number of packets in buffer */ | |
814 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
815 | ||
816 | for (p = 0; p < packets; p++) { | |
817 | if (s->packet_index < 0) | |
7b3b0d85 TS |
818 | break; |
819 | ||
2b3fc456 TS |
820 | buffer = s->buffer.packets[s->packet_index].buffer; |
821 | ||
7b3b0d85 TS |
822 | /* Process sync slave stream */ |
823 | if (s->sync_slave && s->sync_slave->callbacked) { | |
824 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
825 | handle_out_packet(s->sync_slave, syt); | |
826 | } | |
827 | ||
2b3fc456 TS |
828 | /* The number of quadlets in this packet */ |
829 | payload_quadlets = | |
830 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
831 | handle_in_packet(s, payload_quadlets, buffer); | |
832 | } | |
833 | ||
7b3b0d85 TS |
834 | /* Queueing error or detecting discontinuity */ |
835 | if (s->packet_index < 0) { | |
836 | /* Abort sync slave. */ | |
837 | if (s->sync_slave) { | |
838 | s->sync_slave->packet_index = -1; | |
839 | amdtp_stream_pcm_abort(s->sync_slave); | |
840 | } | |
841 | return; | |
842 | } | |
843 | ||
844 | /* when sync to device, flush the packets for slave stream */ | |
845 | if (s->sync_slave && s->sync_slave->callbacked) | |
846 | fw_iso_context_queue_flush(s->sync_slave->context); | |
847 | ||
2b3fc456 TS |
848 | fw_iso_context_queue_flush(s->context); |
849 | } | |
850 | ||
7b3b0d85 TS |
851 | /* processing is done by master callback */ |
852 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
853 | size_t header_length, void *header, | |
854 | void *private_data) | |
855 | { | |
856 | return; | |
857 | } | |
858 | ||
859 | /* this is executed one time */ | |
860 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
861 | u32 cycle, size_t header_length, | |
862 | void *header, void *private_data) | |
863 | { | |
864 | struct amdtp_stream *s = private_data; | |
865 | ||
866 | /* | |
867 | * For in-stream, first packet has come. | |
868 | * For out-stream, prepared to transmit first packet | |
869 | */ | |
870 | s->callbacked = true; | |
871 | wake_up(&s->callback_wait); | |
872 | ||
873 | if (s->direction == AMDTP_IN_STREAM) | |
874 | context->callback.sc = in_stream_callback; | |
875 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
876 | context->callback.sc = slave_stream_callback; | |
877 | else | |
878 | context->callback.sc = out_stream_callback; | |
879 | ||
880 | context->callback.sc(context, cycle, header_length, header, s); | |
881 | } | |
882 | ||
31ef9134 | 883 | /** |
be4a2894 TS |
884 | * amdtp_stream_start - start transferring packets |
885 | * @s: the AMDTP stream to start | |
31ef9134 CL |
886 | * @channel: the isochronous channel on the bus |
887 | * @speed: firewire speed code | |
888 | * | |
889 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
890 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
891 | * device can be started. | |
31ef9134 | 892 | */ |
be4a2894 | 893 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
894 | { |
895 | static const struct { | |
896 | unsigned int data_block; | |
897 | unsigned int syt_offset; | |
898 | } initial_state[] = { | |
899 | [CIP_SFC_32000] = { 4, 3072 }, | |
900 | [CIP_SFC_48000] = { 6, 1024 }, | |
901 | [CIP_SFC_96000] = { 12, 1024 }, | |
902 | [CIP_SFC_192000] = { 24, 1024 }, | |
903 | [CIP_SFC_44100] = { 0, 67 }, | |
904 | [CIP_SFC_88200] = { 0, 67 }, | |
905 | [CIP_SFC_176400] = { 0, 67 }, | |
906 | }; | |
2b3fc456 TS |
907 | unsigned int header_size; |
908 | enum dma_data_direction dir; | |
7ab56645 | 909 | int type, tag, err; |
31ef9134 CL |
910 | |
911 | mutex_lock(&s->mutex); | |
912 | ||
be4a2894 | 913 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 914 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
915 | err = -EBADFD; |
916 | goto err_unlock; | |
917 | } | |
918 | ||
b6bc8123 TS |
919 | if (s->direction == AMDTP_IN_STREAM && |
920 | s->flags & CIP_SKIP_INIT_DBC_CHECK) | |
921 | s->data_block_counter = UINT_MAX; | |
922 | else | |
923 | s->data_block_counter = 0; | |
31ef9134 CL |
924 | s->data_block_state = initial_state[s->sfc].data_block; |
925 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
926 | s->last_syt_offset = TICKS_PER_CYCLE; | |
927 | ||
2b3fc456 TS |
928 | /* initialize packet buffer */ |
929 | if (s->direction == AMDTP_IN_STREAM) { | |
930 | dir = DMA_FROM_DEVICE; | |
931 | type = FW_ISO_CONTEXT_RECEIVE; | |
932 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
933 | } else { |
934 | dir = DMA_TO_DEVICE; | |
935 | type = FW_ISO_CONTEXT_TRANSMIT; | |
936 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 937 | } |
31ef9134 | 938 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 939 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
940 | if (err < 0) |
941 | goto err_unlock; | |
942 | ||
943 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 944 | type, channel, speed, header_size, |
7b3b0d85 | 945 | amdtp_stream_first_callback, s); |
31ef9134 CL |
946 | if (IS_ERR(s->context)) { |
947 | err = PTR_ERR(s->context); | |
948 | if (err == -EBUSY) | |
949 | dev_err(&s->unit->device, | |
be4a2894 | 950 | "no free stream on this controller\n"); |
31ef9134 CL |
951 | goto err_buffer; |
952 | } | |
953 | ||
be4a2894 | 954 | amdtp_stream_update(s); |
31ef9134 | 955 | |
ec00f5e4 | 956 | s->packet_index = 0; |
4b7da117 | 957 | do { |
2b3fc456 TS |
958 | if (s->direction == AMDTP_IN_STREAM) |
959 | err = queue_in_packet(s); | |
960 | else | |
961 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
962 | if (err < 0) |
963 | goto err_context; | |
964 | } while (s->packet_index > 0); | |
31ef9134 | 965 | |
2b3fc456 | 966 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7ab56645 TS |
967 | tag = FW_ISO_CONTEXT_MATCH_TAG1; |
968 | if (s->flags & CIP_EMPTY_WITH_TAG0) | |
969 | tag |= FW_ISO_CONTEXT_MATCH_TAG0; | |
970 | ||
7b3b0d85 | 971 | s->callbacked = false; |
7ab56645 | 972 | err = fw_iso_context_start(s->context, -1, 0, tag); |
31ef9134 CL |
973 | if (err < 0) |
974 | goto err_context; | |
975 | ||
976 | mutex_unlock(&s->mutex); | |
977 | ||
978 | return 0; | |
979 | ||
980 | err_context: | |
981 | fw_iso_context_destroy(s->context); | |
982 | s->context = ERR_PTR(-1); | |
983 | err_buffer: | |
984 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
985 | err_unlock: | |
986 | mutex_unlock(&s->mutex); | |
987 | ||
988 | return err; | |
989 | } | |
be4a2894 | 990 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 991 | |
e9148ddd | 992 | /** |
be4a2894 TS |
993 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
994 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
995 | * |
996 | * Returns the current buffer position, in frames. | |
997 | */ | |
be4a2894 | 998 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 999 | { |
92b862c7 | 1000 | /* this optimization is allowed to be racy */ |
c8de6dbb | 1001 | if (s->pointer_flush && amdtp_stream_running(s)) |
92b862c7 CL |
1002 | fw_iso_context_flush_completions(s->context); |
1003 | else | |
1004 | s->pointer_flush = true; | |
e9148ddd CL |
1005 | |
1006 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
1007 | } | |
be4a2894 | 1008 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 1009 | |
31ef9134 | 1010 | /** |
be4a2894 TS |
1011 | * amdtp_stream_update - update the stream after a bus reset |
1012 | * @s: the AMDTP stream | |
31ef9134 | 1013 | */ |
be4a2894 | 1014 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
1015 | { |
1016 | ACCESS_ONCE(s->source_node_id_field) = | |
1017 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
1018 | } | |
be4a2894 | 1019 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
1020 | |
1021 | /** | |
be4a2894 TS |
1022 | * amdtp_stream_stop - stop sending packets |
1023 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
1024 | * |
1025 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
1026 | * itself can be stopped. | |
1027 | */ | |
be4a2894 | 1028 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
1029 | { |
1030 | mutex_lock(&s->mutex); | |
1031 | ||
be4a2894 | 1032 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
1033 | mutex_unlock(&s->mutex); |
1034 | return; | |
1035 | } | |
1036 | ||
76fb8789 | 1037 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
1038 | fw_iso_context_stop(s->context); |
1039 | fw_iso_context_destroy(s->context); | |
1040 | s->context = ERR_PTR(-1); | |
1041 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
1042 | ||
7b3b0d85 TS |
1043 | s->callbacked = false; |
1044 | ||
31ef9134 CL |
1045 | mutex_unlock(&s->mutex); |
1046 | } | |
be4a2894 | 1047 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
1048 | |
1049 | /** | |
be4a2894 | 1050 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
1051 | * @s: the AMDTP stream about to be stopped |
1052 | * | |
1053 | * If the isochronous stream needs to be stopped asynchronously, call this | |
1054 | * function first to stop the PCM device. | |
1055 | */ | |
be4a2894 | 1056 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
1057 | { |
1058 | struct snd_pcm_substream *pcm; | |
1059 | ||
1060 | pcm = ACCESS_ONCE(s->pcm); | |
1fb8510c TI |
1061 | if (pcm) |
1062 | snd_pcm_stop_xrun(pcm); | |
31ef9134 | 1063 | } |
be4a2894 | 1064 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |