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