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)) | |
2b3fc456 | 42 | #define AMDTP_FDF_NO_DATA 0xff |
b445db44 TS |
43 | #define AMDTP_DBS_MASK 0x00ff0000 |
44 | #define AMDTP_DBS_SHIFT 16 | |
45 | #define AMDTP_DBC_MASK 0x000000ff | |
31ef9134 CL |
46 | |
47 | /* TODO: make these configurable */ | |
48 | #define INTERRUPT_INTERVAL 16 | |
49 | #define QUEUE_LENGTH 48 | |
50 | ||
2b3fc456 | 51 | #define IN_PACKET_HEADER_SIZE 4 |
4b7da117 TS |
52 | #define OUT_PACKET_HEADER_SIZE 0 |
53 | ||
76fb8789 CL |
54 | static void pcm_period_tasklet(unsigned long data); |
55 | ||
31ef9134 | 56 | /** |
be4a2894 TS |
57 | * amdtp_stream_init - initialize an AMDTP stream structure |
58 | * @s: the AMDTP stream to initialize | |
31ef9134 | 59 | * @unit: the target of the stream |
3ff7e8f0 | 60 | * @dir: the direction of stream |
31ef9134 CL |
61 | * @flags: the packet transmission method to use |
62 | */ | |
be4a2894 | 63 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
3ff7e8f0 | 64 | enum amdtp_stream_direction dir, enum cip_flags flags) |
31ef9134 | 65 | { |
31ef9134 | 66 | s->unit = fw_unit_get(unit); |
3ff7e8f0 | 67 | s->direction = dir; |
31ef9134 CL |
68 | s->flags = flags; |
69 | s->context = ERR_PTR(-1); | |
70 | mutex_init(&s->mutex); | |
76fb8789 | 71 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 72 | s->packet_index = 0; |
31ef9134 CL |
73 | |
74 | return 0; | |
75 | } | |
be4a2894 | 76 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
77 | |
78 | /** | |
be4a2894 TS |
79 | * amdtp_stream_destroy - free stream resources |
80 | * @s: the AMDTP stream to destroy | |
31ef9134 | 81 | */ |
be4a2894 | 82 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 83 | { |
be4a2894 | 84 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
85 | mutex_destroy(&s->mutex); |
86 | fw_unit_put(s->unit); | |
87 | } | |
be4a2894 | 88 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 89 | |
c5280e99 | 90 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
91 | [CIP_SFC_32000] = 8, |
92 | [CIP_SFC_44100] = 8, | |
93 | [CIP_SFC_48000] = 8, | |
94 | [CIP_SFC_88200] = 16, | |
95 | [CIP_SFC_96000] = 16, | |
96 | [CIP_SFC_176400] = 32, | |
97 | [CIP_SFC_192000] = 32, | |
98 | }; | |
99 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
100 | ||
31ef9134 | 101 | /** |
be4a2894 TS |
102 | * amdtp_stream_set_parameters - set stream parameters |
103 | * @s: the AMDTP stream to configure | |
31ef9134 | 104 | * @rate: the sample rate |
a7304e3b CL |
105 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
106 | * as AM824 multi-bit linear audio | |
107 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 108 | * |
a7304e3b | 109 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
110 | * changed while the stream is running. |
111 | */ | |
be4a2894 TS |
112 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
113 | unsigned int rate, | |
114 | unsigned int pcm_channels, | |
115 | unsigned int midi_ports) | |
31ef9134 | 116 | { |
a7304e3b CL |
117 | static const unsigned int rates[] = { |
118 | [CIP_SFC_32000] = 32000, | |
119 | [CIP_SFC_44100] = 44100, | |
120 | [CIP_SFC_48000] = 48000, | |
121 | [CIP_SFC_88200] = 88200, | |
122 | [CIP_SFC_96000] = 96000, | |
123 | [CIP_SFC_176400] = 176400, | |
124 | [CIP_SFC_192000] = 192000, | |
31ef9134 CL |
125 | }; |
126 | unsigned int sfc; | |
127 | ||
be4a2894 | 128 | if (WARN_ON(amdtp_stream_running(s))) |
31ef9134 CL |
129 | return; |
130 | ||
a7304e3b CL |
131 | for (sfc = 0; sfc < CIP_SFC_COUNT; ++sfc) |
132 | if (rates[sfc] == rate) | |
e84d15f6 | 133 | goto sfc_found; |
31ef9134 | 134 | WARN_ON(1); |
e84d15f6 CL |
135 | return; |
136 | ||
137 | sfc_found: | |
a7304e3b CL |
138 | s->dual_wire = (s->flags & CIP_HI_DUALWIRE) && sfc > CIP_SFC_96000; |
139 | if (s->dual_wire) { | |
140 | sfc -= 2; | |
141 | rate /= 2; | |
142 | pcm_channels *= 2; | |
143 | } | |
e84d15f6 | 144 | s->sfc = sfc; |
a7304e3b CL |
145 | s->data_block_quadlets = pcm_channels + DIV_ROUND_UP(midi_ports, 8); |
146 | s->pcm_channels = pcm_channels; | |
147 | s->midi_ports = midi_ports; | |
148 | ||
149 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
150 | |
151 | /* default buffering in the device */ | |
152 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
153 | if (s->flags & CIP_BLOCKING) | |
154 | /* additional buffering needed to adjust for no-data packets */ | |
155 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
31ef9134 | 156 | } |
be4a2894 | 157 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
158 | |
159 | /** | |
be4a2894 TS |
160 | * amdtp_stream_get_max_payload - get the stream's packet size |
161 | * @s: the AMDTP stream | |
31ef9134 CL |
162 | * |
163 | * This function must not be called before the stream has been configured | |
be4a2894 | 164 | * with amdtp_stream_set_parameters(). |
31ef9134 | 165 | */ |
be4a2894 | 166 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 167 | { |
e84d15f6 | 168 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 169 | } |
be4a2894 | 170 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 171 | |
be4a2894 | 172 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
173 | struct snd_pcm_substream *pcm, |
174 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 175 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
176 | struct snd_pcm_substream *pcm, |
177 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 178 | static void amdtp_write_s16_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
179 | struct snd_pcm_substream *pcm, |
180 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 181 | static void amdtp_write_s32_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
182 | struct snd_pcm_substream *pcm, |
183 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
184 | static void amdtp_read_s32(struct amdtp_stream *s, |
185 | struct snd_pcm_substream *pcm, | |
186 | __be32 *buffer, unsigned int frames); | |
187 | static void amdtp_read_s32_dualwire(struct amdtp_stream *s, | |
188 | struct snd_pcm_substream *pcm, | |
189 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
190 | |
191 | /** | |
be4a2894 TS |
192 | * amdtp_stream_set_pcm_format - set the PCM format |
193 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
194 | * @format: the format of the ALSA PCM device |
195 | * | |
a7304e3b CL |
196 | * The sample format must be set after the other paramters (rate/PCM channels/ |
197 | * MIDI) and before the stream is started, and must not be changed while the | |
198 | * stream is running. | |
31ef9134 | 199 | */ |
be4a2894 TS |
200 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
201 | snd_pcm_format_t format) | |
31ef9134 | 202 | { |
be4a2894 | 203 | if (WARN_ON(amdtp_stream_running(s))) |
31ef9134 CL |
204 | return; |
205 | ||
206 | switch (format) { | |
207 | default: | |
208 | WARN_ON(1); | |
209 | /* fall through */ | |
210 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 TS |
211 | if (s->direction == AMDTP_OUT_STREAM) { |
212 | if (s->dual_wire) | |
213 | s->transfer_samples = amdtp_write_s16_dualwire; | |
214 | else | |
215 | s->transfer_samples = amdtp_write_s16; | |
216 | break; | |
217 | } | |
218 | WARN_ON(1); | |
219 | /* fall through */ | |
31ef9134 | 220 | case SNDRV_PCM_FORMAT_S32: |
2b3fc456 TS |
221 | if (s->direction == AMDTP_OUT_STREAM) { |
222 | if (s->dual_wire) | |
223 | s->transfer_samples = amdtp_write_s32_dualwire; | |
224 | else | |
225 | s->transfer_samples = amdtp_write_s32; | |
226 | } else { | |
227 | if (s->dual_wire) | |
228 | s->transfer_samples = amdtp_read_s32_dualwire; | |
229 | else | |
230 | s->transfer_samples = amdtp_read_s32; | |
231 | } | |
31ef9134 CL |
232 | break; |
233 | } | |
234 | } | |
be4a2894 | 235 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 236 | |
76fb8789 | 237 | /** |
be4a2894 TS |
238 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
239 | * @s: the AMDTP stream | |
76fb8789 CL |
240 | * |
241 | * This function should be called from the PCM device's .prepare callback. | |
242 | */ | |
be4a2894 | 243 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
244 | { |
245 | tasklet_kill(&s->period_tasklet); | |
246 | s->pcm_buffer_pointer = 0; | |
247 | s->pcm_period_pointer = 0; | |
92b862c7 | 248 | s->pointer_flush = true; |
76fb8789 | 249 | } |
be4a2894 | 250 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 251 | |
be4a2894 | 252 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
253 | { |
254 | unsigned int phase, data_blocks; | |
255 | ||
256 | if (!cip_sfc_is_base_44100(s->sfc)) { | |
257 | /* Sample_rate / 8000 is an integer, and precomputed. */ | |
258 | data_blocks = s->data_block_state; | |
259 | } else { | |
260 | phase = s->data_block_state; | |
261 | ||
262 | /* | |
263 | * This calculates the number of data blocks per packet so that | |
264 | * 1) the overall rate is correct and exactly synchronized to | |
265 | * the bus clock, and | |
266 | * 2) packets with a rounded-up number of blocks occur as early | |
267 | * as possible in the sequence (to prevent underruns of the | |
268 | * device's buffer). | |
269 | */ | |
270 | if (s->sfc == CIP_SFC_44100) | |
271 | /* 6 6 5 6 5 6 5 ... */ | |
272 | data_blocks = 5 + ((phase & 1) ^ | |
273 | (phase == 0 || phase >= 40)); | |
274 | else | |
275 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
276 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
277 | if (++phase >= (80 >> (s->sfc >> 1))) | |
278 | phase = 0; | |
279 | s->data_block_state = phase; | |
280 | } | |
281 | ||
282 | return data_blocks; | |
283 | } | |
284 | ||
be4a2894 | 285 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
286 | unsigned int cycle) |
287 | { | |
288 | unsigned int syt_offset, phase, index, syt; | |
289 | ||
290 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
291 | if (!cip_sfc_is_base_44100(s->sfc)) | |
292 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
293 | else { | |
294 | /* | |
295 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
296 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
297 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
298 | * elements is about 1386.23. Rounding the results of this | |
299 | * formula to the SYT precision results in a sequence of | |
300 | * differences that begins with: | |
301 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
302 | * This code generates _exactly_ the same sequence. | |
303 | */ | |
304 | phase = s->syt_offset_state; | |
305 | index = phase % 13; | |
306 | syt_offset = s->last_syt_offset; | |
307 | syt_offset += 1386 + ((index && !(index & 3)) || | |
308 | phase == 146); | |
309 | if (++phase >= 147) | |
310 | phase = 0; | |
311 | s->syt_offset_state = phase; | |
312 | } | |
313 | } else | |
314 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
315 | s->last_syt_offset = syt_offset; | |
316 | ||
be454366 | 317 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 318 | syt_offset += s->transfer_delay; |
be454366 CL |
319 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
320 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 321 | |
b445db44 | 322 | return syt & CIP_SYT_MASK; |
be454366 | 323 | } else { |
b445db44 | 324 | return CIP_SYT_NO_INFO; |
be454366 | 325 | } |
31ef9134 CL |
326 | } |
327 | ||
be4a2894 | 328 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
329 | struct snd_pcm_substream *pcm, |
330 | __be32 *buffer, unsigned int frames) | |
331 | { | |
332 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
333 | unsigned int channels, remaining_frames, frame_step, i, c; | |
334 | const u32 *src; | |
335 | ||
336 | channels = s->pcm_channels; | |
337 | src = (void *)runtime->dma_area + | |
e84841f9 | 338 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 CL |
339 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
340 | frame_step = s->data_block_quadlets - channels; | |
341 | ||
342 | for (i = 0; i < frames; ++i) { | |
343 | for (c = 0; c < channels; ++c) { | |
344 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
345 | src++; | |
346 | buffer++; | |
347 | } | |
348 | buffer += frame_step; | |
349 | if (--remaining_frames == 0) | |
350 | src = (void *)runtime->dma_area; | |
351 | } | |
352 | } | |
353 | ||
be4a2894 | 354 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
355 | struct snd_pcm_substream *pcm, |
356 | __be32 *buffer, unsigned int frames) | |
357 | { | |
358 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
359 | unsigned int channels, remaining_frames, frame_step, i, c; | |
360 | const u16 *src; | |
361 | ||
362 | channels = s->pcm_channels; | |
363 | src = (void *)runtime->dma_area + | |
e84841f9 | 364 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 CL |
365 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
366 | frame_step = s->data_block_quadlets - channels; | |
367 | ||
368 | for (i = 0; i < frames; ++i) { | |
369 | for (c = 0; c < channels; ++c) { | |
370 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
371 | src++; | |
372 | buffer++; | |
373 | } | |
374 | buffer += frame_step; | |
375 | if (--remaining_frames == 0) | |
376 | src = (void *)runtime->dma_area; | |
377 | } | |
378 | } | |
379 | ||
be4a2894 | 380 | static void amdtp_write_s32_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
381 | struct snd_pcm_substream *pcm, |
382 | __be32 *buffer, unsigned int frames) | |
383 | { | |
384 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
385 | unsigned int channels, frame_adjust_1, frame_adjust_2, i, c; | |
386 | const u32 *src; | |
387 | ||
388 | channels = s->pcm_channels; | |
389 | src = (void *)runtime->dma_area + | |
390 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
391 | frame_adjust_1 = channels - 1; | |
392 | frame_adjust_2 = 1 - (s->data_block_quadlets - channels); | |
393 | ||
394 | channels /= 2; | |
395 | for (i = 0; i < frames; ++i) { | |
396 | for (c = 0; c < channels; ++c) { | |
397 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
398 | src++; | |
399 | buffer += 2; | |
400 | } | |
401 | buffer -= frame_adjust_1; | |
402 | for (c = 0; c < channels; ++c) { | |
403 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
404 | src++; | |
405 | buffer += 2; | |
406 | } | |
407 | buffer -= frame_adjust_2; | |
408 | } | |
409 | } | |
410 | ||
be4a2894 | 411 | static void amdtp_write_s16_dualwire(struct amdtp_stream *s, |
a7304e3b CL |
412 | struct snd_pcm_substream *pcm, |
413 | __be32 *buffer, unsigned int frames) | |
414 | { | |
415 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
416 | unsigned int channels, frame_adjust_1, frame_adjust_2, i, c; | |
417 | const u16 *src; | |
418 | ||
419 | channels = s->pcm_channels; | |
420 | src = (void *)runtime->dma_area + | |
421 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
422 | frame_adjust_1 = channels - 1; | |
423 | frame_adjust_2 = 1 - (s->data_block_quadlets - channels); | |
424 | ||
425 | channels /= 2; | |
426 | for (i = 0; i < frames; ++i) { | |
427 | for (c = 0; c < channels; ++c) { | |
428 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
429 | src++; | |
430 | buffer += 2; | |
431 | } | |
432 | buffer -= frame_adjust_1; | |
433 | for (c = 0; c < channels; ++c) { | |
434 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
435 | src++; | |
436 | buffer += 2; | |
437 | } | |
438 | buffer -= frame_adjust_2; | |
439 | } | |
440 | } | |
441 | ||
2b3fc456 TS |
442 | static void amdtp_read_s32(struct amdtp_stream *s, |
443 | struct snd_pcm_substream *pcm, | |
444 | __be32 *buffer, unsigned int frames) | |
445 | { | |
446 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
447 | unsigned int channels, remaining_frames, i, c; | |
448 | u32 *dst; | |
449 | ||
450 | channels = s->pcm_channels; | |
451 | dst = (void *)runtime->dma_area + | |
452 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
453 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
454 | ||
455 | for (i = 0; i < frames; ++i) { | |
456 | for (c = 0; c < channels; ++c) { | |
457 | *dst = be32_to_cpu(buffer[c]) << 8; | |
458 | dst++; | |
459 | } | |
460 | buffer += s->data_block_quadlets; | |
461 | if (--remaining_frames == 0) | |
462 | dst = (void *)runtime->dma_area; | |
463 | } | |
464 | } | |
465 | ||
466 | static void amdtp_read_s32_dualwire(struct amdtp_stream *s, | |
467 | struct snd_pcm_substream *pcm, | |
468 | __be32 *buffer, unsigned int frames) | |
469 | { | |
470 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
471 | unsigned int channels, remaining_frames, i, c; | |
472 | u32 *dst; | |
473 | ||
474 | dst = (void *)runtime->dma_area + | |
475 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
476 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
477 | channels = s->pcm_channels / 2; | |
478 | ||
479 | for (i = 0; i < frames; ++i) { | |
480 | for (c = 0; c < channels; ++c) { | |
481 | *dst = be32_to_cpu(buffer[c * 2]) << 8; | |
482 | dst++; | |
483 | } | |
484 | buffer += 1; | |
485 | for (c = 0; c < channels; ++c) { | |
486 | *dst = be32_to_cpu(buffer[c * 2]) << 8; | |
487 | dst++; | |
488 | } | |
489 | buffer += s->data_block_quadlets - 1; | |
490 | if (--remaining_frames == 0) | |
491 | dst = (void *)runtime->dma_area; | |
492 | } | |
493 | } | |
494 | ||
be4a2894 | 495 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
496 | __be32 *buffer, unsigned int frames) |
497 | { | |
498 | unsigned int i, c; | |
499 | ||
500 | for (i = 0; i < frames; ++i) { | |
501 | for (c = 0; c < s->pcm_channels; ++c) | |
502 | buffer[c] = cpu_to_be32(0x40000000); | |
503 | buffer += s->data_block_quadlets; | |
504 | } | |
505 | } | |
506 | ||
be4a2894 | 507 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
508 | __be32 *buffer, unsigned int frames) |
509 | { | |
510 | unsigned int i; | |
511 | ||
512 | for (i = 0; i < frames; ++i) | |
513 | buffer[s->pcm_channels + i * s->data_block_quadlets] = | |
514 | cpu_to_be32(0x80000000); | |
515 | } | |
516 | ||
4b7da117 TS |
517 | static void update_pcm_pointers(struct amdtp_stream *s, |
518 | struct snd_pcm_substream *pcm, | |
519 | unsigned int frames) | |
520 | { unsigned int ptr; | |
521 | ||
522 | if (s->dual_wire) | |
523 | frames *= 2; | |
524 | ||
525 | ptr = s->pcm_buffer_pointer + frames; | |
526 | if (ptr >= pcm->runtime->buffer_size) | |
527 | ptr -= pcm->runtime->buffer_size; | |
528 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
529 | ||
530 | s->pcm_period_pointer += frames; | |
531 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
532 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
533 | s->pointer_flush = false; | |
534 | tasklet_hi_schedule(&s->period_tasklet); | |
535 | } | |
536 | } | |
537 | ||
538 | static void pcm_period_tasklet(unsigned long data) | |
539 | { | |
540 | struct amdtp_stream *s = (void *)data; | |
541 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
542 | ||
543 | if (pcm) | |
544 | snd_pcm_period_elapsed(pcm); | |
545 | } | |
546 | ||
547 | static int queue_packet(struct amdtp_stream *s, | |
548 | unsigned int header_length, | |
549 | unsigned int payload_length, bool skip) | |
550 | { | |
551 | struct fw_iso_packet p = {0}; | |
552 | int err; | |
553 | ||
554 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
555 | p.tag = TAG_CIP; | |
556 | p.header_length = header_length; | |
557 | p.payload_length = (!skip) ? payload_length : 0; | |
558 | p.skip = skip; | |
559 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
560 | s->buffer.packets[s->packet_index].offset); | |
561 | if (err < 0) { | |
562 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
563 | goto end; | |
564 | } | |
565 | ||
566 | if (++s->packet_index >= QUEUE_LENGTH) | |
567 | s->packet_index = 0; | |
568 | end: | |
569 | return err; | |
570 | } | |
571 | ||
572 | static inline int queue_out_packet(struct amdtp_stream *s, | |
573 | unsigned int payload_length, bool skip) | |
574 | { | |
575 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
576 | payload_length, skip); | |
577 | } | |
578 | ||
2b3fc456 TS |
579 | static inline int queue_in_packet(struct amdtp_stream *s) |
580 | { | |
581 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
582 | amdtp_stream_get_max_payload(s), false); | |
583 | } | |
584 | ||
4b7da117 | 585 | static void handle_out_packet(struct amdtp_stream *s, unsigned int cycle) |
31ef9134 CL |
586 | { |
587 | __be32 *buffer; | |
4b7da117 | 588 | unsigned int index, data_blocks, syt, payload_length; |
31ef9134 | 589 | struct snd_pcm_substream *pcm; |
31ef9134 | 590 | |
ec00f5e4 CL |
591 | if (s->packet_index < 0) |
592 | return; | |
593 | index = s->packet_index; | |
594 | ||
82755abf | 595 | /* this module generate empty packet for 'no data' */ |
31ef9134 | 596 | syt = calculate_syt(s, cycle); |
82755abf | 597 | if (!(s->flags & CIP_BLOCKING)) |
e84d15f6 | 598 | data_blocks = calculate_data_blocks(s); |
b445db44 | 599 | else if (syt != CIP_SYT_NO_INFO) |
82755abf TS |
600 | data_blocks = s->syt_interval; |
601 | else | |
602 | data_blocks = 0; | |
31ef9134 | 603 | |
ec00f5e4 | 604 | buffer = s->buffer.packets[index].buffer; |
31ef9134 | 605 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 606 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
607 | s->data_block_counter); |
608 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 609 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
610 | buffer += 2; |
611 | ||
612 | pcm = ACCESS_ONCE(s->pcm); | |
613 | if (pcm) | |
614 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
615 | else | |
616 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
617 | if (s->midi_ports) | |
618 | amdtp_fill_midi(s, buffer, data_blocks); | |
619 | ||
620 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
621 | ||
4b7da117 TS |
622 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
623 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 624 | s->packet_index = -1; |
be4a2894 | 625 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
626 | return; |
627 | } | |
31ef9134 | 628 | |
76fb8789 | 629 | if (pcm) |
4b7da117 | 630 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
631 | } |
632 | ||
2b3fc456 TS |
633 | static void handle_in_packet(struct amdtp_stream *s, |
634 | unsigned int payload_quadlets, | |
635 | __be32 *buffer) | |
636 | { | |
637 | u32 cip_header[2]; | |
638 | unsigned int data_blocks, data_block_quadlets, data_block_counter; | |
639 | struct snd_pcm_substream *pcm = NULL; | |
640 | ||
641 | cip_header[0] = be32_to_cpu(buffer[0]); | |
642 | cip_header[1] = be32_to_cpu(buffer[1]); | |
643 | ||
644 | /* | |
645 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
646 | * For convinience, also check FMT field is AM824 or not. | |
647 | */ | |
648 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
649 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
650 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
651 | dev_info_ratelimited(&s->unit->device, | |
652 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
653 | cip_header[0], cip_header[1]); | |
654 | goto end; | |
655 | } | |
656 | ||
657 | /* Calculate data blocks */ | |
658 | if (payload_quadlets < 3 || | |
659 | ((cip_header[1] & CIP_FDF_MASK) == | |
660 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
661 | data_blocks = 0; | |
662 | } else { | |
663 | data_block_quadlets = | |
664 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
665 | /* avoid division by zero */ | |
666 | if (data_block_quadlets == 0) { | |
667 | dev_info_ratelimited(&s->unit->device, | |
668 | "Detect invalid value in dbs field: %08X\n", | |
669 | cip_header[0]); | |
670 | goto err; | |
671 | } | |
672 | ||
673 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
674 | } | |
675 | ||
676 | /* Check data block counter continuity */ | |
677 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
678 | if (data_block_counter != s->data_block_counter) { | |
679 | dev_info(&s->unit->device, | |
680 | "Detect discontinuity of CIP: %02X %02X\n", | |
681 | s->data_block_counter, data_block_counter); | |
682 | goto err; | |
683 | } | |
684 | ||
685 | if (data_blocks > 0) { | |
686 | buffer += 2; | |
687 | ||
688 | pcm = ACCESS_ONCE(s->pcm); | |
689 | if (pcm) | |
690 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
691 | } | |
692 | ||
693 | s->data_block_counter = (data_block_counter + data_blocks) & 0xff; | |
694 | end: | |
695 | if (queue_in_packet(s) < 0) | |
696 | goto err; | |
697 | ||
698 | if (pcm) | |
699 | update_pcm_pointers(s, pcm, data_blocks); | |
700 | ||
701 | return; | |
702 | err: | |
703 | s->packet_index = -1; | |
704 | amdtp_stream_pcm_abort(s); | |
705 | } | |
706 | ||
4b7da117 TS |
707 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
708 | size_t header_length, void *header, | |
709 | void *private_data) | |
31ef9134 | 710 | { |
be4a2894 | 711 | struct amdtp_stream *s = private_data; |
31ef9134 CL |
712 | unsigned int i, packets = header_length / 4; |
713 | ||
714 | /* | |
715 | * Compute the cycle of the last queued packet. | |
716 | * (We need only the four lowest bits for the SYT, so we can ignore | |
717 | * that bits 0-11 must wrap around at 3072.) | |
718 | */ | |
719 | cycle += QUEUE_LENGTH - packets; | |
720 | ||
721 | for (i = 0; i < packets; ++i) | |
4b7da117 | 722 | handle_out_packet(s, ++cycle); |
13882a82 | 723 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
724 | } |
725 | ||
2b3fc456 TS |
726 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
727 | size_t header_length, void *header, | |
728 | void *private_data) | |
729 | { | |
730 | struct amdtp_stream *s = private_data; | |
731 | unsigned int p, packets, payload_quadlets; | |
732 | __be32 *buffer, *headers = header; | |
733 | ||
734 | /* The number of packets in buffer */ | |
735 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
736 | ||
737 | for (p = 0; p < packets; p++) { | |
738 | if (s->packet_index < 0) | |
739 | return; | |
740 | buffer = s->buffer.packets[s->packet_index].buffer; | |
741 | ||
742 | /* The number of quadlets in this packet */ | |
743 | payload_quadlets = | |
744 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
745 | handle_in_packet(s, payload_quadlets, buffer); | |
746 | } | |
747 | ||
748 | fw_iso_context_queue_flush(s->context); | |
749 | } | |
750 | ||
31ef9134 | 751 | /** |
be4a2894 TS |
752 | * amdtp_stream_start - start transferring packets |
753 | * @s: the AMDTP stream to start | |
31ef9134 CL |
754 | * @channel: the isochronous channel on the bus |
755 | * @speed: firewire speed code | |
756 | * | |
757 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
758 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
759 | * device can be started. | |
31ef9134 | 760 | */ |
be4a2894 | 761 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
762 | { |
763 | static const struct { | |
764 | unsigned int data_block; | |
765 | unsigned int syt_offset; | |
766 | } initial_state[] = { | |
767 | [CIP_SFC_32000] = { 4, 3072 }, | |
768 | [CIP_SFC_48000] = { 6, 1024 }, | |
769 | [CIP_SFC_96000] = { 12, 1024 }, | |
770 | [CIP_SFC_192000] = { 24, 1024 }, | |
771 | [CIP_SFC_44100] = { 0, 67 }, | |
772 | [CIP_SFC_88200] = { 0, 67 }, | |
773 | [CIP_SFC_176400] = { 0, 67 }, | |
774 | }; | |
2b3fc456 TS |
775 | unsigned int header_size; |
776 | enum dma_data_direction dir; | |
777 | fw_iso_callback_t cb; | |
778 | int type, err; | |
31ef9134 CL |
779 | |
780 | mutex_lock(&s->mutex); | |
781 | ||
be4a2894 | 782 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 783 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
784 | err = -EBADFD; |
785 | goto err_unlock; | |
786 | } | |
787 | ||
4b7da117 | 788 | s->data_block_counter = 0; |
31ef9134 CL |
789 | s->data_block_state = initial_state[s->sfc].data_block; |
790 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
791 | s->last_syt_offset = TICKS_PER_CYCLE; | |
792 | ||
2b3fc456 TS |
793 | /* initialize packet buffer */ |
794 | if (s->direction == AMDTP_IN_STREAM) { | |
795 | dir = DMA_FROM_DEVICE; | |
796 | type = FW_ISO_CONTEXT_RECEIVE; | |
797 | header_size = IN_PACKET_HEADER_SIZE; | |
798 | cb = in_stream_callback; | |
799 | } else { | |
800 | dir = DMA_TO_DEVICE; | |
801 | type = FW_ISO_CONTEXT_TRANSMIT; | |
802 | header_size = OUT_PACKET_HEADER_SIZE; | |
803 | cb = out_stream_callback; | |
804 | } | |
31ef9134 | 805 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 806 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
807 | if (err < 0) |
808 | goto err_unlock; | |
809 | ||
810 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 TS |
811 | type, channel, speed, header_size, |
812 | cb, s); | |
31ef9134 CL |
813 | if (IS_ERR(s->context)) { |
814 | err = PTR_ERR(s->context); | |
815 | if (err == -EBUSY) | |
816 | dev_err(&s->unit->device, | |
be4a2894 | 817 | "no free stream on this controller\n"); |
31ef9134 CL |
818 | goto err_buffer; |
819 | } | |
820 | ||
be4a2894 | 821 | amdtp_stream_update(s); |
31ef9134 | 822 | |
ec00f5e4 | 823 | s->packet_index = 0; |
4b7da117 | 824 | do { |
2b3fc456 TS |
825 | if (s->direction == AMDTP_IN_STREAM) |
826 | err = queue_in_packet(s); | |
827 | else | |
828 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
829 | if (err < 0) |
830 | goto err_context; | |
831 | } while (s->packet_index > 0); | |
31ef9134 | 832 | |
2b3fc456 TS |
833 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
834 | err = fw_iso_context_start(s->context, -1, 0, | |
835 | FW_ISO_CONTEXT_MATCH_TAG1); | |
31ef9134 CL |
836 | if (err < 0) |
837 | goto err_context; | |
838 | ||
839 | mutex_unlock(&s->mutex); | |
840 | ||
841 | return 0; | |
842 | ||
843 | err_context: | |
844 | fw_iso_context_destroy(s->context); | |
845 | s->context = ERR_PTR(-1); | |
846 | err_buffer: | |
847 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
848 | err_unlock: | |
849 | mutex_unlock(&s->mutex); | |
850 | ||
851 | return err; | |
852 | } | |
be4a2894 | 853 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 854 | |
e9148ddd | 855 | /** |
be4a2894 TS |
856 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
857 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
858 | * |
859 | * Returns the current buffer position, in frames. | |
860 | */ | |
be4a2894 | 861 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 862 | { |
92b862c7 CL |
863 | /* this optimization is allowed to be racy */ |
864 | if (s->pointer_flush) | |
865 | fw_iso_context_flush_completions(s->context); | |
866 | else | |
867 | s->pointer_flush = true; | |
e9148ddd CL |
868 | |
869 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
870 | } | |
be4a2894 | 871 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 872 | |
31ef9134 | 873 | /** |
be4a2894 TS |
874 | * amdtp_stream_update - update the stream after a bus reset |
875 | * @s: the AMDTP stream | |
31ef9134 | 876 | */ |
be4a2894 | 877 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
878 | { |
879 | ACCESS_ONCE(s->source_node_id_field) = | |
880 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
881 | } | |
be4a2894 | 882 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
883 | |
884 | /** | |
be4a2894 TS |
885 | * amdtp_stream_stop - stop sending packets |
886 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
887 | * |
888 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
889 | * itself can be stopped. | |
890 | */ | |
be4a2894 | 891 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
892 | { |
893 | mutex_lock(&s->mutex); | |
894 | ||
be4a2894 | 895 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
896 | mutex_unlock(&s->mutex); |
897 | return; | |
898 | } | |
899 | ||
76fb8789 | 900 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
901 | fw_iso_context_stop(s->context); |
902 | fw_iso_context_destroy(s->context); | |
903 | s->context = ERR_PTR(-1); | |
904 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
905 | ||
906 | mutex_unlock(&s->mutex); | |
907 | } | |
be4a2894 | 908 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
909 | |
910 | /** | |
be4a2894 | 911 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
912 | * @s: the AMDTP stream about to be stopped |
913 | * | |
914 | * If the isochronous stream needs to be stopped asynchronously, call this | |
915 | * function first to stop the PCM device. | |
916 | */ | |
be4a2894 | 917 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
918 | { |
919 | struct snd_pcm_substream *pcm; | |
920 | ||
921 | pcm = ACCESS_ONCE(s->pcm); | |
922 | if (pcm) { | |
923 | snd_pcm_stream_lock_irq(pcm); | |
924 | if (snd_pcm_running(pcm)) | |
925 | snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); | |
926 | snd_pcm_stream_unlock_irq(pcm); | |
927 | } | |
928 | } | |
be4a2894 | 929 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |