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> | |
14 | #include <sound/pcm.h> | |
15 | #include "amdtp.h" | |
16 | ||
17 | #define TICKS_PER_CYCLE 3072 | |
18 | #define CYCLES_PER_SECOND 8000 | |
19 | #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) | |
20 | ||
21 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ | |
22 | ||
b445db44 TS |
23 | /* isochronous header parameters */ |
24 | #define ISO_DATA_LENGTH_SHIFT 16 | |
31ef9134 CL |
25 | #define TAG_CIP 1 |
26 | ||
b445db44 | 27 | /* common isochronous packet header parameters */ |
31ef9134 | 28 | #define CIP_EOH (1u << 31) |
b445db44 | 29 | #define CIP_EOH_MASK 0x80000000 |
31ef9134 | 30 | #define CIP_FMT_AM (0x10 << 24) |
b445db44 TS |
31 | #define CIP_FMT_MASK 0x3f000000 |
32 | #define CIP_SYT_MASK 0x0000ffff | |
33 | #define CIP_SYT_NO_INFO 0xffff | |
34 | #define CIP_FDF_MASK 0x00ff0000 | |
35 | #define CIP_FDF_SFC_SHIFT 16 | |
36 | ||
37 | /* | |
38 | * Audio and Music transfer protocol specific parameters | |
39 | * only "Clock-based rate control mode" is supported | |
40 | */ | |
41 | #define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3)) | |
42 | #define AMDTP_DBS_MASK 0x00ff0000 | |
43 | #define AMDTP_DBS_SHIFT 16 | |
44 | #define AMDTP_DBC_MASK 0x000000ff | |
31ef9134 CL |
45 | |
46 | /* TODO: make these configurable */ | |
47 | #define INTERRUPT_INTERVAL 16 | |
48 | #define QUEUE_LENGTH 48 | |
49 | ||
4b7da117 TS |
50 | #define OUT_PACKET_HEADER_SIZE 0 |
51 | ||
76fb8789 CL |
52 | static void pcm_period_tasklet(unsigned long data); |
53 | ||
31ef9134 | 54 | /** |
be4a2894 TS |
55 | * amdtp_stream_init - initialize an AMDTP stream structure |
56 | * @s: the AMDTP stream to initialize | |
31ef9134 | 57 | * @unit: the target of the stream |
3ff7e8f0 | 58 | * @dir: the direction of stream |
31ef9134 CL |
59 | * @flags: the packet transmission method to use |
60 | */ | |
be4a2894 | 61 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
3ff7e8f0 | 62 | enum amdtp_stream_direction dir, enum cip_flags flags) |
31ef9134 | 63 | { |
31ef9134 | 64 | s->unit = fw_unit_get(unit); |
3ff7e8f0 | 65 | s->direction = dir; |
31ef9134 CL |
66 | s->flags = flags; |
67 | s->context = ERR_PTR(-1); | |
68 | mutex_init(&s->mutex); | |
76fb8789 | 69 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 70 | s->packet_index = 0; |
31ef9134 CL |
71 | |
72 | return 0; | |
73 | } | |
be4a2894 | 74 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
75 | |
76 | /** | |
be4a2894 TS |
77 | * amdtp_stream_destroy - free stream resources |
78 | * @s: the AMDTP stream to destroy | |
31ef9134 | 79 | */ |
be4a2894 | 80 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 81 | { |
be4a2894 | 82 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
83 | mutex_destroy(&s->mutex); |
84 | fw_unit_put(s->unit); | |
85 | } | |
be4a2894 | 86 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 87 | |
c5280e99 | 88 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
89 | [CIP_SFC_32000] = 8, |
90 | [CIP_SFC_44100] = 8, | |
91 | [CIP_SFC_48000] = 8, | |
92 | [CIP_SFC_88200] = 16, | |
93 | [CIP_SFC_96000] = 16, | |
94 | [CIP_SFC_176400] = 32, | |
95 | [CIP_SFC_192000] = 32, | |
96 | }; | |
97 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
98 | ||
31ef9134 | 99 | /** |
be4a2894 TS |
100 | * amdtp_stream_set_parameters - set stream parameters |
101 | * @s: the AMDTP stream to configure | |
31ef9134 | 102 | * @rate: the sample rate |
a7304e3b CL |
103 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
104 | * as AM824 multi-bit linear audio | |
105 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 106 | * |
a7304e3b | 107 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
108 | * changed while the stream is running. |
109 | */ | |
be4a2894 TS |
110 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
111 | unsigned int rate, | |
112 | unsigned int pcm_channels, | |
113 | unsigned int midi_ports) | |
31ef9134 | 114 | { |
a7304e3b CL |
115 | static const unsigned int rates[] = { |
116 | [CIP_SFC_32000] = 32000, | |
117 | [CIP_SFC_44100] = 44100, | |
118 | [CIP_SFC_48000] = 48000, | |
119 | [CIP_SFC_88200] = 88200, | |
120 | [CIP_SFC_96000] = 96000, | |
121 | [CIP_SFC_176400] = 176400, | |
122 | [CIP_SFC_192000] = 192000, | |
31ef9134 CL |
123 | }; |
124 | unsigned int sfc; | |
125 | ||
be4a2894 | 126 | if (WARN_ON(amdtp_stream_running(s))) |
31ef9134 CL |
127 | return; |
128 | ||
a7304e3b CL |
129 | for (sfc = 0; sfc < CIP_SFC_COUNT; ++sfc) |
130 | if (rates[sfc] == rate) | |
e84d15f6 | 131 | goto sfc_found; |
31ef9134 | 132 | WARN_ON(1); |
e84d15f6 CL |
133 | return; |
134 | ||
135 | sfc_found: | |
a7304e3b CL |
136 | s->dual_wire = (s->flags & CIP_HI_DUALWIRE) && sfc > CIP_SFC_96000; |
137 | if (s->dual_wire) { | |
138 | sfc -= 2; | |
139 | rate /= 2; | |
140 | pcm_channels *= 2; | |
141 | } | |
e84d15f6 | 142 | s->sfc = sfc; |
a7304e3b CL |
143 | s->data_block_quadlets = pcm_channels + DIV_ROUND_UP(midi_ports, 8); |
144 | s->pcm_channels = pcm_channels; | |
145 | s->midi_ports = midi_ports; | |
146 | ||
147 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
148 | |
149 | /* default buffering in the device */ | |
150 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
151 | if (s->flags & CIP_BLOCKING) | |
152 | /* additional buffering needed to adjust for no-data packets */ | |
153 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
31ef9134 | 154 | } |
be4a2894 | 155 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
156 | |
157 | /** | |
be4a2894 TS |
158 | * amdtp_stream_get_max_payload - get the stream's packet size |
159 | * @s: the AMDTP stream | |
31ef9134 CL |
160 | * |
161 | * This function must not be called before the stream has been configured | |
be4a2894 | 162 | * with amdtp_stream_set_parameters(). |
31ef9134 | 163 | */ |
be4a2894 | 164 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 165 | { |
e84d15f6 | 166 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 167 | } |
be4a2894 | 168 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 169 | |
be4a2894 | 170 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
171 | struct snd_pcm_substream *pcm, |
172 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 173 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
174 | struct snd_pcm_substream *pcm, |
175 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 176 | static void amdtp_write_s16_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
177 | struct snd_pcm_substream *pcm, |
178 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 179 | static void amdtp_write_s32_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
180 | struct snd_pcm_substream *pcm, |
181 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
182 | |
183 | /** | |
be4a2894 TS |
184 | * amdtp_stream_set_pcm_format - set the PCM format |
185 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
186 | * @format: the format of the ALSA PCM device |
187 | * | |
a7304e3b CL |
188 | * The sample format must be set after the other paramters (rate/PCM channels/ |
189 | * MIDI) and before the stream is started, and must not be changed while the | |
190 | * stream is running. | |
31ef9134 | 191 | */ |
be4a2894 TS |
192 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
193 | snd_pcm_format_t format) | |
31ef9134 | 194 | { |
be4a2894 | 195 | if (WARN_ON(amdtp_stream_running(s))) |
31ef9134 CL |
196 | return; |
197 | ||
198 | switch (format) { | |
199 | default: | |
200 | WARN_ON(1); | |
201 | /* fall through */ | |
202 | case SNDRV_PCM_FORMAT_S16: | |
a7304e3b CL |
203 | if (s->dual_wire) |
204 | s->transfer_samples = amdtp_write_s16_dualwire; | |
205 | else | |
206 | s->transfer_samples = amdtp_write_s16; | |
31ef9134 CL |
207 | break; |
208 | case SNDRV_PCM_FORMAT_S32: | |
a7304e3b CL |
209 | if (s->dual_wire) |
210 | s->transfer_samples = amdtp_write_s32_dualwire; | |
211 | else | |
212 | s->transfer_samples = amdtp_write_s32; | |
31ef9134 CL |
213 | break; |
214 | } | |
215 | } | |
be4a2894 | 216 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 217 | |
76fb8789 | 218 | /** |
be4a2894 TS |
219 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
220 | * @s: the AMDTP stream | |
76fb8789 CL |
221 | * |
222 | * This function should be called from the PCM device's .prepare callback. | |
223 | */ | |
be4a2894 | 224 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
225 | { |
226 | tasklet_kill(&s->period_tasklet); | |
227 | s->pcm_buffer_pointer = 0; | |
228 | s->pcm_period_pointer = 0; | |
92b862c7 | 229 | s->pointer_flush = true; |
76fb8789 | 230 | } |
be4a2894 | 231 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 232 | |
be4a2894 | 233 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
234 | { |
235 | unsigned int phase, data_blocks; | |
236 | ||
237 | if (!cip_sfc_is_base_44100(s->sfc)) { | |
238 | /* Sample_rate / 8000 is an integer, and precomputed. */ | |
239 | data_blocks = s->data_block_state; | |
240 | } else { | |
241 | phase = s->data_block_state; | |
242 | ||
243 | /* | |
244 | * This calculates the number of data blocks per packet so that | |
245 | * 1) the overall rate is correct and exactly synchronized to | |
246 | * the bus clock, and | |
247 | * 2) packets with a rounded-up number of blocks occur as early | |
248 | * as possible in the sequence (to prevent underruns of the | |
249 | * device's buffer). | |
250 | */ | |
251 | if (s->sfc == CIP_SFC_44100) | |
252 | /* 6 6 5 6 5 6 5 ... */ | |
253 | data_blocks = 5 + ((phase & 1) ^ | |
254 | (phase == 0 || phase >= 40)); | |
255 | else | |
256 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
257 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
258 | if (++phase >= (80 >> (s->sfc >> 1))) | |
259 | phase = 0; | |
260 | s->data_block_state = phase; | |
261 | } | |
262 | ||
263 | return data_blocks; | |
264 | } | |
265 | ||
be4a2894 | 266 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
267 | unsigned int cycle) |
268 | { | |
269 | unsigned int syt_offset, phase, index, syt; | |
270 | ||
271 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
272 | if (!cip_sfc_is_base_44100(s->sfc)) | |
273 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
274 | else { | |
275 | /* | |
276 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
277 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
278 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
279 | * elements is about 1386.23. Rounding the results of this | |
280 | * formula to the SYT precision results in a sequence of | |
281 | * differences that begins with: | |
282 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
283 | * This code generates _exactly_ the same sequence. | |
284 | */ | |
285 | phase = s->syt_offset_state; | |
286 | index = phase % 13; | |
287 | syt_offset = s->last_syt_offset; | |
288 | syt_offset += 1386 + ((index && !(index & 3)) || | |
289 | phase == 146); | |
290 | if (++phase >= 147) | |
291 | phase = 0; | |
292 | s->syt_offset_state = phase; | |
293 | } | |
294 | } else | |
295 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
296 | s->last_syt_offset = syt_offset; | |
297 | ||
be454366 | 298 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 299 | syt_offset += s->transfer_delay; |
be454366 CL |
300 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
301 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 302 | |
b445db44 | 303 | return syt & CIP_SYT_MASK; |
be454366 | 304 | } else { |
b445db44 | 305 | return CIP_SYT_NO_INFO; |
be454366 | 306 | } |
31ef9134 CL |
307 | } |
308 | ||
be4a2894 | 309 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
310 | struct snd_pcm_substream *pcm, |
311 | __be32 *buffer, unsigned int frames) | |
312 | { | |
313 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
314 | unsigned int channels, remaining_frames, frame_step, i, c; | |
315 | const u32 *src; | |
316 | ||
317 | channels = s->pcm_channels; | |
318 | src = (void *)runtime->dma_area + | |
e84841f9 | 319 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 CL |
320 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
321 | frame_step = s->data_block_quadlets - channels; | |
322 | ||
323 | for (i = 0; i < frames; ++i) { | |
324 | for (c = 0; c < channels; ++c) { | |
325 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
326 | src++; | |
327 | buffer++; | |
328 | } | |
329 | buffer += frame_step; | |
330 | if (--remaining_frames == 0) | |
331 | src = (void *)runtime->dma_area; | |
332 | } | |
333 | } | |
334 | ||
be4a2894 | 335 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
336 | struct snd_pcm_substream *pcm, |
337 | __be32 *buffer, unsigned int frames) | |
338 | { | |
339 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
340 | unsigned int channels, remaining_frames, frame_step, i, c; | |
341 | const u16 *src; | |
342 | ||
343 | channels = s->pcm_channels; | |
344 | src = (void *)runtime->dma_area + | |
e84841f9 | 345 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 CL |
346 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
347 | frame_step = s->data_block_quadlets - channels; | |
348 | ||
349 | for (i = 0; i < frames; ++i) { | |
350 | for (c = 0; c < channels; ++c) { | |
351 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
352 | src++; | |
353 | buffer++; | |
354 | } | |
355 | buffer += frame_step; | |
356 | if (--remaining_frames == 0) | |
357 | src = (void *)runtime->dma_area; | |
358 | } | |
359 | } | |
360 | ||
be4a2894 | 361 | static void amdtp_write_s32_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
362 | struct snd_pcm_substream *pcm, |
363 | __be32 *buffer, unsigned int frames) | |
364 | { | |
365 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
366 | unsigned int channels, frame_adjust_1, frame_adjust_2, i, c; | |
367 | const u32 *src; | |
368 | ||
369 | channels = s->pcm_channels; | |
370 | src = (void *)runtime->dma_area + | |
371 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
372 | frame_adjust_1 = channels - 1; | |
373 | frame_adjust_2 = 1 - (s->data_block_quadlets - channels); | |
374 | ||
375 | channels /= 2; | |
376 | for (i = 0; i < frames; ++i) { | |
377 | for (c = 0; c < channels; ++c) { | |
378 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
379 | src++; | |
380 | buffer += 2; | |
381 | } | |
382 | buffer -= frame_adjust_1; | |
383 | for (c = 0; c < channels; ++c) { | |
384 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
385 | src++; | |
386 | buffer += 2; | |
387 | } | |
388 | buffer -= frame_adjust_2; | |
389 | } | |
390 | } | |
391 | ||
be4a2894 | 392 | static void amdtp_write_s16_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
393 | struct snd_pcm_substream *pcm, |
394 | __be32 *buffer, unsigned int frames) | |
395 | { | |
396 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
397 | unsigned int channels, frame_adjust_1, frame_adjust_2, i, c; | |
398 | const u16 *src; | |
399 | ||
400 | channels = s->pcm_channels; | |
401 | src = (void *)runtime->dma_area + | |
402 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
403 | frame_adjust_1 = channels - 1; | |
404 | frame_adjust_2 = 1 - (s->data_block_quadlets - channels); | |
405 | ||
406 | channels /= 2; | |
407 | for (i = 0; i < frames; ++i) { | |
408 | for (c = 0; c < channels; ++c) { | |
409 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
410 | src++; | |
411 | buffer += 2; | |
412 | } | |
413 | buffer -= frame_adjust_1; | |
414 | for (c = 0; c < channels; ++c) { | |
415 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
416 | src++; | |
417 | buffer += 2; | |
418 | } | |
419 | buffer -= frame_adjust_2; | |
420 | } | |
421 | } | |
422 | ||
be4a2894 | 423 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
424 | __be32 *buffer, unsigned int frames) |
425 | { | |
426 | unsigned int i, c; | |
427 | ||
428 | for (i = 0; i < frames; ++i) { | |
429 | for (c = 0; c < s->pcm_channels; ++c) | |
430 | buffer[c] = cpu_to_be32(0x40000000); | |
431 | buffer += s->data_block_quadlets; | |
432 | } | |
433 | } | |
434 | ||
be4a2894 | 435 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
436 | __be32 *buffer, unsigned int frames) |
437 | { | |
438 | unsigned int i; | |
439 | ||
440 | for (i = 0; i < frames; ++i) | |
441 | buffer[s->pcm_channels + i * s->data_block_quadlets] = | |
442 | cpu_to_be32(0x80000000); | |
443 | } | |
444 | ||
4b7da117 TS |
445 | static void update_pcm_pointers(struct amdtp_stream *s, |
446 | struct snd_pcm_substream *pcm, | |
447 | unsigned int frames) | |
448 | { unsigned int ptr; | |
449 | ||
450 | if (s->dual_wire) | |
451 | frames *= 2; | |
452 | ||
453 | ptr = s->pcm_buffer_pointer + frames; | |
454 | if (ptr >= pcm->runtime->buffer_size) | |
455 | ptr -= pcm->runtime->buffer_size; | |
456 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
457 | ||
458 | s->pcm_period_pointer += frames; | |
459 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
460 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
461 | s->pointer_flush = false; | |
462 | tasklet_hi_schedule(&s->period_tasklet); | |
463 | } | |
464 | } | |
465 | ||
466 | static void pcm_period_tasklet(unsigned long data) | |
467 | { | |
468 | struct amdtp_stream *s = (void *)data; | |
469 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
470 | ||
471 | if (pcm) | |
472 | snd_pcm_period_elapsed(pcm); | |
473 | } | |
474 | ||
475 | static int queue_packet(struct amdtp_stream *s, | |
476 | unsigned int header_length, | |
477 | unsigned int payload_length, bool skip) | |
478 | { | |
479 | struct fw_iso_packet p = {0}; | |
480 | int err; | |
481 | ||
482 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
483 | p.tag = TAG_CIP; | |
484 | p.header_length = header_length; | |
485 | p.payload_length = (!skip) ? payload_length : 0; | |
486 | p.skip = skip; | |
487 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
488 | s->buffer.packets[s->packet_index].offset); | |
489 | if (err < 0) { | |
490 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
491 | goto end; | |
492 | } | |
493 | ||
494 | if (++s->packet_index >= QUEUE_LENGTH) | |
495 | s->packet_index = 0; | |
496 | end: | |
497 | return err; | |
498 | } | |
499 | ||
500 | static inline int queue_out_packet(struct amdtp_stream *s, | |
501 | unsigned int payload_length, bool skip) | |
502 | { | |
503 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
504 | payload_length, skip); | |
505 | } | |
506 | ||
507 | static void handle_out_packet(struct amdtp_stream *s, unsigned int cycle) | |
31ef9134 CL |
508 | { |
509 | __be32 *buffer; | |
4b7da117 | 510 | unsigned int index, data_blocks, syt, payload_length; |
31ef9134 | 511 | struct snd_pcm_substream *pcm; |
31ef9134 | 512 | |
ec00f5e4 CL |
513 | if (s->packet_index < 0) |
514 | return; | |
515 | index = s->packet_index; | |
516 | ||
82755abf | 517 | /* this module generate empty packet for 'no data' */ |
31ef9134 | 518 | syt = calculate_syt(s, cycle); |
82755abf | 519 | if (!(s->flags & CIP_BLOCKING)) |
e84d15f6 | 520 | data_blocks = calculate_data_blocks(s); |
b445db44 | 521 | else if (syt != CIP_SYT_NO_INFO) |
82755abf TS |
522 | data_blocks = s->syt_interval; |
523 | else | |
524 | data_blocks = 0; | |
31ef9134 | 525 | |
ec00f5e4 | 526 | buffer = s->buffer.packets[index].buffer; |
31ef9134 | 527 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 528 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
529 | s->data_block_counter); |
530 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 531 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
532 | buffer += 2; |
533 | ||
534 | pcm = ACCESS_ONCE(s->pcm); | |
535 | if (pcm) | |
536 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
537 | else | |
538 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
539 | if (s->midi_ports) | |
540 | amdtp_fill_midi(s, buffer, data_blocks); | |
541 | ||
542 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
543 | ||
4b7da117 TS |
544 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
545 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 546 | s->packet_index = -1; |
be4a2894 | 547 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
548 | return; |
549 | } | |
31ef9134 | 550 | |
76fb8789 | 551 | if (pcm) |
4b7da117 | 552 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
553 | } |
554 | ||
4b7da117 TS |
555 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
556 | size_t header_length, void *header, | |
557 | void *private_data) | |
31ef9134 | 558 | { |
be4a2894 | 559 | struct amdtp_stream *s = private_data; |
31ef9134 CL |
560 | unsigned int i, packets = header_length / 4; |
561 | ||
562 | /* | |
563 | * Compute the cycle of the last queued packet. | |
564 | * (We need only the four lowest bits for the SYT, so we can ignore | |
565 | * that bits 0-11 must wrap around at 3072.) | |
566 | */ | |
567 | cycle += QUEUE_LENGTH - packets; | |
568 | ||
569 | for (i = 0; i < packets; ++i) | |
4b7da117 | 570 | handle_out_packet(s, ++cycle); |
13882a82 | 571 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
572 | } |
573 | ||
31ef9134 | 574 | /** |
be4a2894 TS |
575 | * amdtp_stream_start - start transferring packets |
576 | * @s: the AMDTP stream to start | |
31ef9134 CL |
577 | * @channel: the isochronous channel on the bus |
578 | * @speed: firewire speed code | |
579 | * | |
580 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
581 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
582 | * device can be started. | |
31ef9134 | 583 | */ |
be4a2894 | 584 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
585 | { |
586 | static const struct { | |
587 | unsigned int data_block; | |
588 | unsigned int syt_offset; | |
589 | } initial_state[] = { | |
590 | [CIP_SFC_32000] = { 4, 3072 }, | |
591 | [CIP_SFC_48000] = { 6, 1024 }, | |
592 | [CIP_SFC_96000] = { 12, 1024 }, | |
593 | [CIP_SFC_192000] = { 24, 1024 }, | |
594 | [CIP_SFC_44100] = { 0, 67 }, | |
595 | [CIP_SFC_88200] = { 0, 67 }, | |
596 | [CIP_SFC_176400] = { 0, 67 }, | |
597 | }; | |
598 | int err; | |
599 | ||
600 | mutex_lock(&s->mutex); | |
601 | ||
be4a2894 | 602 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 603 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
604 | err = -EBADFD; |
605 | goto err_unlock; | |
606 | } | |
607 | ||
4b7da117 | 608 | s->data_block_counter = 0; |
31ef9134 CL |
609 | s->data_block_state = initial_state[s->sfc].data_block; |
610 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
611 | s->last_syt_offset = TICKS_PER_CYCLE; | |
612 | ||
613 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, | |
be4a2894 | 614 | amdtp_stream_get_max_payload(s), |
31ef9134 CL |
615 | DMA_TO_DEVICE); |
616 | if (err < 0) | |
617 | goto err_unlock; | |
618 | ||
619 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
620 | FW_ISO_CONTEXT_TRANSMIT, | |
621 | channel, speed, 0, | |
4b7da117 | 622 | out_stream_callback, s); |
31ef9134 CL |
623 | if (IS_ERR(s->context)) { |
624 | err = PTR_ERR(s->context); | |
625 | if (err == -EBUSY) | |
626 | dev_err(&s->unit->device, | |
be4a2894 | 627 | "no free stream on this controller\n"); |
31ef9134 CL |
628 | goto err_buffer; |
629 | } | |
630 | ||
be4a2894 | 631 | amdtp_stream_update(s); |
31ef9134 | 632 | |
ec00f5e4 | 633 | s->packet_index = 0; |
4b7da117 TS |
634 | do { |
635 | err = queue_out_packet(s, 0, true); | |
636 | if (err < 0) | |
637 | goto err_context; | |
638 | } while (s->packet_index > 0); | |
31ef9134 CL |
639 | |
640 | err = fw_iso_context_start(s->context, -1, 0, 0); | |
641 | if (err < 0) | |
642 | goto err_context; | |
643 | ||
644 | mutex_unlock(&s->mutex); | |
645 | ||
646 | return 0; | |
647 | ||
648 | err_context: | |
649 | fw_iso_context_destroy(s->context); | |
650 | s->context = ERR_PTR(-1); | |
651 | err_buffer: | |
652 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
653 | err_unlock: | |
654 | mutex_unlock(&s->mutex); | |
655 | ||
656 | return err; | |
657 | } | |
be4a2894 | 658 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 659 | |
e9148ddd | 660 | /** |
be4a2894 TS |
661 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
662 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
663 | * |
664 | * Returns the current buffer position, in frames. | |
665 | */ | |
be4a2894 | 666 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 667 | { |
92b862c7 CL |
668 | /* this optimization is allowed to be racy */ |
669 | if (s->pointer_flush) | |
670 | fw_iso_context_flush_completions(s->context); | |
671 | else | |
672 | s->pointer_flush = true; | |
e9148ddd CL |
673 | |
674 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
675 | } | |
be4a2894 | 676 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 677 | |
31ef9134 | 678 | /** |
be4a2894 TS |
679 | * amdtp_stream_update - update the stream after a bus reset |
680 | * @s: the AMDTP stream | |
31ef9134 | 681 | */ |
be4a2894 | 682 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
683 | { |
684 | ACCESS_ONCE(s->source_node_id_field) = | |
685 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
686 | } | |
be4a2894 | 687 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
688 | |
689 | /** | |
be4a2894 TS |
690 | * amdtp_stream_stop - stop sending packets |
691 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
692 | * |
693 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
694 | * itself can be stopped. | |
695 | */ | |
be4a2894 | 696 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
697 | { |
698 | mutex_lock(&s->mutex); | |
699 | ||
be4a2894 | 700 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
701 | mutex_unlock(&s->mutex); |
702 | return; | |
703 | } | |
704 | ||
76fb8789 | 705 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
706 | fw_iso_context_stop(s->context); |
707 | fw_iso_context_destroy(s->context); | |
708 | s->context = ERR_PTR(-1); | |
709 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
710 | ||
711 | mutex_unlock(&s->mutex); | |
712 | } | |
be4a2894 | 713 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
714 | |
715 | /** | |
be4a2894 | 716 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
717 | * @s: the AMDTP stream about to be stopped |
718 | * | |
719 | * If the isochronous stream needs to be stopped asynchronously, call this | |
720 | * function first to stop the PCM device. | |
721 | */ | |
be4a2894 | 722 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
723 | { |
724 | struct snd_pcm_substream *pcm; | |
725 | ||
726 | pcm = ACCESS_ONCE(s->pcm); | |
727 | if (pcm) { | |
728 | snd_pcm_stream_lock_irq(pcm); | |
729 | if (snd_pcm_running(pcm)) | |
730 | snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); | |
731 | snd_pcm_stream_unlock_irq(pcm); | |
732 | } | |
733 | } | |
be4a2894 | 734 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |