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Commit | Line | Data |
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31ef9134 CL |
1 | /* |
2 | * Audio and Music Data Transmission Protocol (IEC 61883-6) streams | |
3 | * with Common Isochronous Packet (IEC 61883-1) headers | |
4 | * | |
5 | * Copyright (c) Clemens Ladisch <clemens@ladisch.de> | |
6 | * Licensed under the terms of the GNU General Public License, version 2. | |
7 | */ | |
8 | ||
9 | #include <linux/device.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/firewire.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
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 | ||
23 | #define TAG_CIP 1 | |
24 | ||
25 | #define CIP_EOH (1u << 31) | |
26 | #define CIP_FMT_AM (0x10 << 24) | |
27 | #define AMDTP_FDF_AM824 (0 << 19) | |
28 | #define AMDTP_FDF_SFC_SHIFT 16 | |
29 | ||
30 | /* TODO: make these configurable */ | |
31 | #define INTERRUPT_INTERVAL 16 | |
32 | #define QUEUE_LENGTH 48 | |
33 | ||
76fb8789 CL |
34 | static void pcm_period_tasklet(unsigned long data); |
35 | ||
31ef9134 | 36 | /** |
be4a2894 TS |
37 | * amdtp_stream_init - initialize an AMDTP stream structure |
38 | * @s: the AMDTP stream to initialize | |
31ef9134 CL |
39 | * @unit: the target of the stream |
40 | * @flags: the packet transmission method to use | |
41 | */ | |
be4a2894 TS |
42 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
43 | enum cip_flags flags) | |
31ef9134 | 44 | { |
31ef9134 CL |
45 | s->unit = fw_unit_get(unit); |
46 | s->flags = flags; | |
47 | s->context = ERR_PTR(-1); | |
48 | mutex_init(&s->mutex); | |
76fb8789 | 49 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 50 | s->packet_index = 0; |
31ef9134 CL |
51 | |
52 | return 0; | |
53 | } | |
be4a2894 | 54 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
55 | |
56 | /** | |
be4a2894 TS |
57 | * amdtp_stream_destroy - free stream resources |
58 | * @s: the AMDTP stream to destroy | |
31ef9134 | 59 | */ |
be4a2894 | 60 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 61 | { |
be4a2894 | 62 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
63 | mutex_destroy(&s->mutex); |
64 | fw_unit_put(s->unit); | |
65 | } | |
be4a2894 | 66 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 67 | |
c5280e99 | 68 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
69 | [CIP_SFC_32000] = 8, |
70 | [CIP_SFC_44100] = 8, | |
71 | [CIP_SFC_48000] = 8, | |
72 | [CIP_SFC_88200] = 16, | |
73 | [CIP_SFC_96000] = 16, | |
74 | [CIP_SFC_176400] = 32, | |
75 | [CIP_SFC_192000] = 32, | |
76 | }; | |
77 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
78 | ||
31ef9134 | 79 | /** |
be4a2894 TS |
80 | * amdtp_stream_set_parameters - set stream parameters |
81 | * @s: the AMDTP stream to configure | |
31ef9134 | 82 | * @rate: the sample rate |
a7304e3b CL |
83 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
84 | * as AM824 multi-bit linear audio | |
85 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 86 | * |
a7304e3b | 87 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
88 | * changed while the stream is running. |
89 | */ | |
be4a2894 TS |
90 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
91 | unsigned int rate, | |
92 | unsigned int pcm_channels, | |
93 | unsigned int midi_ports) | |
31ef9134 | 94 | { |
a7304e3b CL |
95 | static const unsigned int rates[] = { |
96 | [CIP_SFC_32000] = 32000, | |
97 | [CIP_SFC_44100] = 44100, | |
98 | [CIP_SFC_48000] = 48000, | |
99 | [CIP_SFC_88200] = 88200, | |
100 | [CIP_SFC_96000] = 96000, | |
101 | [CIP_SFC_176400] = 176400, | |
102 | [CIP_SFC_192000] = 192000, | |
31ef9134 CL |
103 | }; |
104 | unsigned int sfc; | |
105 | ||
be4a2894 | 106 | if (WARN_ON(amdtp_stream_running(s))) |
31ef9134 CL |
107 | return; |
108 | ||
a7304e3b CL |
109 | for (sfc = 0; sfc < CIP_SFC_COUNT; ++sfc) |
110 | if (rates[sfc] == rate) | |
e84d15f6 | 111 | goto sfc_found; |
31ef9134 | 112 | WARN_ON(1); |
e84d15f6 CL |
113 | return; |
114 | ||
115 | sfc_found: | |
a7304e3b CL |
116 | s->dual_wire = (s->flags & CIP_HI_DUALWIRE) && sfc > CIP_SFC_96000; |
117 | if (s->dual_wire) { | |
118 | sfc -= 2; | |
119 | rate /= 2; | |
120 | pcm_channels *= 2; | |
121 | } | |
e84d15f6 | 122 | s->sfc = sfc; |
a7304e3b CL |
123 | s->data_block_quadlets = pcm_channels + DIV_ROUND_UP(midi_ports, 8); |
124 | s->pcm_channels = pcm_channels; | |
125 | s->midi_ports = midi_ports; | |
126 | ||
127 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
128 | |
129 | /* default buffering in the device */ | |
130 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
131 | if (s->flags & CIP_BLOCKING) | |
132 | /* additional buffering needed to adjust for no-data packets */ | |
133 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
31ef9134 | 134 | } |
be4a2894 | 135 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
136 | |
137 | /** | |
be4a2894 TS |
138 | * amdtp_stream_get_max_payload - get the stream's packet size |
139 | * @s: the AMDTP stream | |
31ef9134 CL |
140 | * |
141 | * This function must not be called before the stream has been configured | |
be4a2894 | 142 | * with amdtp_stream_set_parameters(). |
31ef9134 | 143 | */ |
be4a2894 | 144 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 145 | { |
e84d15f6 | 146 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 147 | } |
be4a2894 | 148 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 149 | |
be4a2894 | 150 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
151 | struct snd_pcm_substream *pcm, |
152 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 153 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
154 | struct snd_pcm_substream *pcm, |
155 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 156 | static void amdtp_write_s16_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
157 | struct snd_pcm_substream *pcm, |
158 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 159 | static void amdtp_write_s32_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
160 | struct snd_pcm_substream *pcm, |
161 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
162 | |
163 | /** | |
be4a2894 TS |
164 | * amdtp_stream_set_pcm_format - set the PCM format |
165 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
166 | * @format: the format of the ALSA PCM device |
167 | * | |
a7304e3b CL |
168 | * The sample format must be set after the other paramters (rate/PCM channels/ |
169 | * MIDI) and before the stream is started, and must not be changed while the | |
170 | * stream is running. | |
31ef9134 | 171 | */ |
be4a2894 TS |
172 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
173 | snd_pcm_format_t format) | |
31ef9134 | 174 | { |
be4a2894 | 175 | if (WARN_ON(amdtp_stream_running(s))) |
31ef9134 CL |
176 | return; |
177 | ||
178 | switch (format) { | |
179 | default: | |
180 | WARN_ON(1); | |
181 | /* fall through */ | |
182 | case SNDRV_PCM_FORMAT_S16: | |
a7304e3b CL |
183 | if (s->dual_wire) |
184 | s->transfer_samples = amdtp_write_s16_dualwire; | |
185 | else | |
186 | s->transfer_samples = amdtp_write_s16; | |
31ef9134 CL |
187 | break; |
188 | case SNDRV_PCM_FORMAT_S32: | |
a7304e3b CL |
189 | if (s->dual_wire) |
190 | s->transfer_samples = amdtp_write_s32_dualwire; | |
191 | else | |
192 | s->transfer_samples = amdtp_write_s32; | |
31ef9134 CL |
193 | break; |
194 | } | |
195 | } | |
be4a2894 | 196 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 197 | |
76fb8789 | 198 | /** |
be4a2894 TS |
199 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
200 | * @s: the AMDTP stream | |
76fb8789 CL |
201 | * |
202 | * This function should be called from the PCM device's .prepare callback. | |
203 | */ | |
be4a2894 | 204 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
205 | { |
206 | tasklet_kill(&s->period_tasklet); | |
207 | s->pcm_buffer_pointer = 0; | |
208 | s->pcm_period_pointer = 0; | |
92b862c7 | 209 | s->pointer_flush = true; |
76fb8789 | 210 | } |
be4a2894 | 211 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 212 | |
be4a2894 | 213 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
214 | { |
215 | unsigned int phase, data_blocks; | |
216 | ||
217 | if (!cip_sfc_is_base_44100(s->sfc)) { | |
218 | /* Sample_rate / 8000 is an integer, and precomputed. */ | |
219 | data_blocks = s->data_block_state; | |
220 | } else { | |
221 | phase = s->data_block_state; | |
222 | ||
223 | /* | |
224 | * This calculates the number of data blocks per packet so that | |
225 | * 1) the overall rate is correct and exactly synchronized to | |
226 | * the bus clock, and | |
227 | * 2) packets with a rounded-up number of blocks occur as early | |
228 | * as possible in the sequence (to prevent underruns of the | |
229 | * device's buffer). | |
230 | */ | |
231 | if (s->sfc == CIP_SFC_44100) | |
232 | /* 6 6 5 6 5 6 5 ... */ | |
233 | data_blocks = 5 + ((phase & 1) ^ | |
234 | (phase == 0 || phase >= 40)); | |
235 | else | |
236 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
237 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
238 | if (++phase >= (80 >> (s->sfc >> 1))) | |
239 | phase = 0; | |
240 | s->data_block_state = phase; | |
241 | } | |
242 | ||
243 | return data_blocks; | |
244 | } | |
245 | ||
be4a2894 | 246 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
247 | unsigned int cycle) |
248 | { | |
249 | unsigned int syt_offset, phase, index, syt; | |
250 | ||
251 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
252 | if (!cip_sfc_is_base_44100(s->sfc)) | |
253 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
254 | else { | |
255 | /* | |
256 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
257 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
258 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
259 | * elements is about 1386.23. Rounding the results of this | |
260 | * formula to the SYT precision results in a sequence of | |
261 | * differences that begins with: | |
262 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
263 | * This code generates _exactly_ the same sequence. | |
264 | */ | |
265 | phase = s->syt_offset_state; | |
266 | index = phase % 13; | |
267 | syt_offset = s->last_syt_offset; | |
268 | syt_offset += 1386 + ((index && !(index & 3)) || | |
269 | phase == 146); | |
270 | if (++phase >= 147) | |
271 | phase = 0; | |
272 | s->syt_offset_state = phase; | |
273 | } | |
274 | } else | |
275 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
276 | s->last_syt_offset = syt_offset; | |
277 | ||
be454366 | 278 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 279 | syt_offset += s->transfer_delay; |
be454366 CL |
280 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
281 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 282 | |
be454366 CL |
283 | return syt & 0xffff; |
284 | } else { | |
285 | return 0xffff; /* no info */ | |
286 | } | |
31ef9134 CL |
287 | } |
288 | ||
be4a2894 | 289 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
290 | struct snd_pcm_substream *pcm, |
291 | __be32 *buffer, unsigned int frames) | |
292 | { | |
293 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
294 | unsigned int channels, remaining_frames, frame_step, i, c; | |
295 | const u32 *src; | |
296 | ||
297 | channels = s->pcm_channels; | |
298 | src = (void *)runtime->dma_area + | |
e84841f9 | 299 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 CL |
300 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
301 | frame_step = s->data_block_quadlets - channels; | |
302 | ||
303 | for (i = 0; i < frames; ++i) { | |
304 | for (c = 0; c < channels; ++c) { | |
305 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
306 | src++; | |
307 | buffer++; | |
308 | } | |
309 | buffer += frame_step; | |
310 | if (--remaining_frames == 0) | |
311 | src = (void *)runtime->dma_area; | |
312 | } | |
313 | } | |
314 | ||
be4a2894 | 315 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
316 | struct snd_pcm_substream *pcm, |
317 | __be32 *buffer, unsigned int frames) | |
318 | { | |
319 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
320 | unsigned int channels, remaining_frames, frame_step, i, c; | |
321 | const u16 *src; | |
322 | ||
323 | channels = s->pcm_channels; | |
324 | src = (void *)runtime->dma_area + | |
e84841f9 | 325 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 CL |
326 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
327 | frame_step = s->data_block_quadlets - channels; | |
328 | ||
329 | for (i = 0; i < frames; ++i) { | |
330 | for (c = 0; c < channels; ++c) { | |
331 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
332 | src++; | |
333 | buffer++; | |
334 | } | |
335 | buffer += frame_step; | |
336 | if (--remaining_frames == 0) | |
337 | src = (void *)runtime->dma_area; | |
338 | } | |
339 | } | |
340 | ||
be4a2894 | 341 | static void amdtp_write_s32_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
342 | struct snd_pcm_substream *pcm, |
343 | __be32 *buffer, unsigned int frames) | |
344 | { | |
345 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
346 | unsigned int channels, frame_adjust_1, frame_adjust_2, i, c; | |
347 | const u32 *src; | |
348 | ||
349 | channels = s->pcm_channels; | |
350 | src = (void *)runtime->dma_area + | |
351 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
352 | frame_adjust_1 = channels - 1; | |
353 | frame_adjust_2 = 1 - (s->data_block_quadlets - channels); | |
354 | ||
355 | channels /= 2; | |
356 | for (i = 0; i < frames; ++i) { | |
357 | for (c = 0; c < channels; ++c) { | |
358 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
359 | src++; | |
360 | buffer += 2; | |
361 | } | |
362 | buffer -= frame_adjust_1; | |
363 | for (c = 0; c < channels; ++c) { | |
364 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
365 | src++; | |
366 | buffer += 2; | |
367 | } | |
368 | buffer -= frame_adjust_2; | |
369 | } | |
370 | } | |
371 | ||
be4a2894 | 372 | static void amdtp_write_s16_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
373 | struct snd_pcm_substream *pcm, |
374 | __be32 *buffer, unsigned int frames) | |
375 | { | |
376 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
377 | unsigned int channels, frame_adjust_1, frame_adjust_2, i, c; | |
378 | const u16 *src; | |
379 | ||
380 | channels = s->pcm_channels; | |
381 | src = (void *)runtime->dma_area + | |
382 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
383 | frame_adjust_1 = channels - 1; | |
384 | frame_adjust_2 = 1 - (s->data_block_quadlets - channels); | |
385 | ||
386 | channels /= 2; | |
387 | for (i = 0; i < frames; ++i) { | |
388 | for (c = 0; c < channels; ++c) { | |
389 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
390 | src++; | |
391 | buffer += 2; | |
392 | } | |
393 | buffer -= frame_adjust_1; | |
394 | for (c = 0; c < channels; ++c) { | |
395 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
396 | src++; | |
397 | buffer += 2; | |
398 | } | |
399 | buffer -= frame_adjust_2; | |
400 | } | |
401 | } | |
402 | ||
be4a2894 | 403 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
404 | __be32 *buffer, unsigned int frames) |
405 | { | |
406 | unsigned int i, c; | |
407 | ||
408 | for (i = 0; i < frames; ++i) { | |
409 | for (c = 0; c < s->pcm_channels; ++c) | |
410 | buffer[c] = cpu_to_be32(0x40000000); | |
411 | buffer += s->data_block_quadlets; | |
412 | } | |
413 | } | |
414 | ||
be4a2894 | 415 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
416 | __be32 *buffer, unsigned int frames) |
417 | { | |
418 | unsigned int i; | |
419 | ||
420 | for (i = 0; i < frames; ++i) | |
421 | buffer[s->pcm_channels + i * s->data_block_quadlets] = | |
422 | cpu_to_be32(0x80000000); | |
423 | } | |
424 | ||
be4a2894 | 425 | static void queue_out_packet(struct amdtp_stream *s, unsigned int cycle) |
31ef9134 CL |
426 | { |
427 | __be32 *buffer; | |
ec00f5e4 | 428 | unsigned int index, data_blocks, syt, ptr; |
31ef9134 CL |
429 | struct snd_pcm_substream *pcm; |
430 | struct fw_iso_packet packet; | |
431 | int err; | |
432 | ||
ec00f5e4 CL |
433 | if (s->packet_index < 0) |
434 | return; | |
435 | index = s->packet_index; | |
436 | ||
82755abf | 437 | /* this module generate empty packet for 'no data' */ |
31ef9134 | 438 | syt = calculate_syt(s, cycle); |
82755abf | 439 | if (!(s->flags & CIP_BLOCKING)) |
e84d15f6 | 440 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
441 | else if (syt != 0xffff) |
442 | data_blocks = s->syt_interval; | |
443 | else | |
444 | data_blocks = 0; | |
31ef9134 | 445 | |
ec00f5e4 | 446 | buffer = s->buffer.packets[index].buffer; |
31ef9134 CL |
447 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
448 | (s->data_block_quadlets << 16) | | |
449 | s->data_block_counter); | |
450 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
451 | (s->sfc << AMDTP_FDF_SFC_SHIFT) | syt); | |
452 | buffer += 2; | |
453 | ||
454 | pcm = ACCESS_ONCE(s->pcm); | |
455 | if (pcm) | |
456 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
457 | else | |
458 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
459 | if (s->midi_ports) | |
460 | amdtp_fill_midi(s, buffer, data_blocks); | |
461 | ||
462 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
463 | ||
464 | packet.payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; | |
ec00f5e4 | 465 | packet.interrupt = IS_ALIGNED(index + 1, INTERRUPT_INTERVAL); |
31ef9134 CL |
466 | packet.skip = 0; |
467 | packet.tag = TAG_CIP; | |
468 | packet.sy = 0; | |
469 | packet.header_length = 0; | |
470 | ||
471 | err = fw_iso_context_queue(s->context, &packet, &s->buffer.iso_buffer, | |
ec00f5e4 CL |
472 | s->buffer.packets[index].offset); |
473 | if (err < 0) { | |
31ef9134 | 474 | dev_err(&s->unit->device, "queueing error: %d\n", err); |
ec00f5e4 | 475 | s->packet_index = -1; |
be4a2894 | 476 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
477 | return; |
478 | } | |
31ef9134 | 479 | |
ec00f5e4 CL |
480 | if (++index >= QUEUE_LENGTH) |
481 | index = 0; | |
482 | s->packet_index = index; | |
31ef9134 CL |
483 | |
484 | if (pcm) { | |
a7304e3b CL |
485 | if (s->dual_wire) |
486 | data_blocks *= 2; | |
487 | ||
31ef9134 CL |
488 | ptr = s->pcm_buffer_pointer + data_blocks; |
489 | if (ptr >= pcm->runtime->buffer_size) | |
490 | ptr -= pcm->runtime->buffer_size; | |
491 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
492 | ||
493 | s->pcm_period_pointer += data_blocks; | |
494 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
495 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
92b862c7 | 496 | s->pointer_flush = false; |
76fb8789 | 497 | tasklet_hi_schedule(&s->period_tasklet); |
31ef9134 CL |
498 | } |
499 | } | |
500 | } | |
501 | ||
76fb8789 CL |
502 | static void pcm_period_tasklet(unsigned long data) |
503 | { | |
be4a2894 | 504 | struct amdtp_stream *s = (void *)data; |
76fb8789 CL |
505 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); |
506 | ||
507 | if (pcm) | |
508 | snd_pcm_period_elapsed(pcm); | |
509 | } | |
510 | ||
31ef9134 | 511 | static void out_packet_callback(struct fw_iso_context *context, u32 cycle, |
be4a2894 | 512 | size_t header_length, void *header, void *private_data) |
31ef9134 | 513 | { |
be4a2894 | 514 | struct amdtp_stream *s = private_data; |
31ef9134 CL |
515 | unsigned int i, packets = header_length / 4; |
516 | ||
517 | /* | |
518 | * Compute the cycle of the last queued packet. | |
519 | * (We need only the four lowest bits for the SYT, so we can ignore | |
520 | * that bits 0-11 must wrap around at 3072.) | |
521 | */ | |
522 | cycle += QUEUE_LENGTH - packets; | |
523 | ||
524 | for (i = 0; i < packets; ++i) | |
525 | queue_out_packet(s, ++cycle); | |
13882a82 | 526 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
527 | } |
528 | ||
be4a2894 | 529 | static int queue_initial_skip_packets(struct amdtp_stream *s) |
31ef9134 CL |
530 | { |
531 | struct fw_iso_packet skip_packet = { | |
532 | .skip = 1, | |
533 | }; | |
534 | unsigned int i; | |
535 | int err; | |
536 | ||
537 | for (i = 0; i < QUEUE_LENGTH; ++i) { | |
ec00f5e4 | 538 | skip_packet.interrupt = IS_ALIGNED(s->packet_index + 1, |
31ef9134 CL |
539 | INTERRUPT_INTERVAL); |
540 | err = fw_iso_context_queue(s->context, &skip_packet, NULL, 0); | |
541 | if (err < 0) | |
542 | return err; | |
ec00f5e4 CL |
543 | if (++s->packet_index >= QUEUE_LENGTH) |
544 | s->packet_index = 0; | |
31ef9134 CL |
545 | } |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | /** | |
be4a2894 TS |
551 | * amdtp_stream_start - start transferring packets |
552 | * @s: the AMDTP stream to start | |
31ef9134 CL |
553 | * @channel: the isochronous channel on the bus |
554 | * @speed: firewire speed code | |
555 | * | |
556 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
557 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
558 | * device can be started. | |
31ef9134 | 559 | */ |
be4a2894 | 560 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
561 | { |
562 | static const struct { | |
563 | unsigned int data_block; | |
564 | unsigned int syt_offset; | |
565 | } initial_state[] = { | |
566 | [CIP_SFC_32000] = { 4, 3072 }, | |
567 | [CIP_SFC_48000] = { 6, 1024 }, | |
568 | [CIP_SFC_96000] = { 12, 1024 }, | |
569 | [CIP_SFC_192000] = { 24, 1024 }, | |
570 | [CIP_SFC_44100] = { 0, 67 }, | |
571 | [CIP_SFC_88200] = { 0, 67 }, | |
572 | [CIP_SFC_176400] = { 0, 67 }, | |
573 | }; | |
574 | int err; | |
575 | ||
576 | mutex_lock(&s->mutex); | |
577 | ||
be4a2894 | 578 | if (WARN_ON(amdtp_stream_running(s) || |
31ef9134 CL |
579 | (!s->pcm_channels && !s->midi_ports))) { |
580 | err = -EBADFD; | |
581 | goto err_unlock; | |
582 | } | |
583 | ||
584 | s->data_block_state = initial_state[s->sfc].data_block; | |
585 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
586 | s->last_syt_offset = TICKS_PER_CYCLE; | |
587 | ||
588 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, | |
be4a2894 | 589 | amdtp_stream_get_max_payload(s), |
31ef9134 CL |
590 | DMA_TO_DEVICE); |
591 | if (err < 0) | |
592 | goto err_unlock; | |
593 | ||
594 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
595 | FW_ISO_CONTEXT_TRANSMIT, | |
596 | channel, speed, 0, | |
597 | out_packet_callback, s); | |
598 | if (IS_ERR(s->context)) { | |
599 | err = PTR_ERR(s->context); | |
600 | if (err == -EBUSY) | |
601 | dev_err(&s->unit->device, | |
be4a2894 | 602 | "no free stream on this controller\n"); |
31ef9134 CL |
603 | goto err_buffer; |
604 | } | |
605 | ||
be4a2894 | 606 | amdtp_stream_update(s); |
31ef9134 | 607 | |
ec00f5e4 | 608 | s->packet_index = 0; |
31ef9134 CL |
609 | s->data_block_counter = 0; |
610 | err = queue_initial_skip_packets(s); | |
611 | if (err < 0) | |
612 | goto err_context; | |
613 | ||
614 | err = fw_iso_context_start(s->context, -1, 0, 0); | |
615 | if (err < 0) | |
616 | goto err_context; | |
617 | ||
618 | mutex_unlock(&s->mutex); | |
619 | ||
620 | return 0; | |
621 | ||
622 | err_context: | |
623 | fw_iso_context_destroy(s->context); | |
624 | s->context = ERR_PTR(-1); | |
625 | err_buffer: | |
626 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
627 | err_unlock: | |
628 | mutex_unlock(&s->mutex); | |
629 | ||
630 | return err; | |
631 | } | |
be4a2894 | 632 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 633 | |
e9148ddd | 634 | /** |
be4a2894 TS |
635 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
636 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
637 | * |
638 | * Returns the current buffer position, in frames. | |
639 | */ | |
be4a2894 | 640 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 641 | { |
92b862c7 CL |
642 | /* this optimization is allowed to be racy */ |
643 | if (s->pointer_flush) | |
644 | fw_iso_context_flush_completions(s->context); | |
645 | else | |
646 | s->pointer_flush = true; | |
e9148ddd CL |
647 | |
648 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
649 | } | |
be4a2894 | 650 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 651 | |
31ef9134 | 652 | /** |
be4a2894 TS |
653 | * amdtp_stream_update - update the stream after a bus reset |
654 | * @s: the AMDTP stream | |
31ef9134 | 655 | */ |
be4a2894 | 656 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
657 | { |
658 | ACCESS_ONCE(s->source_node_id_field) = | |
659 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
660 | } | |
be4a2894 | 661 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
662 | |
663 | /** | |
be4a2894 TS |
664 | * amdtp_stream_stop - stop sending packets |
665 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
666 | * |
667 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
668 | * itself can be stopped. | |
669 | */ | |
be4a2894 | 670 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
671 | { |
672 | mutex_lock(&s->mutex); | |
673 | ||
be4a2894 | 674 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
675 | mutex_unlock(&s->mutex); |
676 | return; | |
677 | } | |
678 | ||
76fb8789 | 679 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
680 | fw_iso_context_stop(s->context); |
681 | fw_iso_context_destroy(s->context); | |
682 | s->context = ERR_PTR(-1); | |
683 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
684 | ||
685 | mutex_unlock(&s->mutex); | |
686 | } | |
be4a2894 | 687 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
688 | |
689 | /** | |
be4a2894 | 690 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
691 | * @s: the AMDTP stream about to be stopped |
692 | * | |
693 | * If the isochronous stream needs to be stopped asynchronously, call this | |
694 | * function first to stop the PCM device. | |
695 | */ | |
be4a2894 | 696 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
697 | { |
698 | struct snd_pcm_substream *pcm; | |
699 | ||
700 | pcm = ACCESS_ONCE(s->pcm); | |
701 | if (pcm) { | |
702 | snd_pcm_stream_lock_irq(pcm); | |
703 | if (snd_pcm_running(pcm)) | |
704 | snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); | |
705 | snd_pcm_stream_unlock_irq(pcm); | |
706 | } | |
707 | } | |
be4a2894 | 708 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |