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> | |
7b2d99fa | 15 | #include <sound/pcm_params.h> |
d67c46b9 | 16 | #include "amdtp-stream.h" |
31ef9134 CL |
17 | |
18 | #define TICKS_PER_CYCLE 3072 | |
19 | #define CYCLES_PER_SECOND 8000 | |
20 | #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) | |
21 | ||
0c95c1d6 TS |
22 | /* Always support Linux tracing subsystem. */ |
23 | #define CREATE_TRACE_POINTS | |
24 | #include "amdtp-stream-trace.h" | |
25 | ||
ca5b5050 | 26 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 microseconds */ |
31ef9134 | 27 | |
b445db44 TS |
28 | /* isochronous header parameters */ |
29 | #define ISO_DATA_LENGTH_SHIFT 16 | |
3b196c39 | 30 | #define TAG_NO_CIP_HEADER 0 |
31ef9134 CL |
31 | #define TAG_CIP 1 |
32 | ||
b445db44 | 33 | /* common isochronous packet header parameters */ |
9a2820c1 TS |
34 | #define CIP_EOH_SHIFT 31 |
35 | #define CIP_EOH (1u << CIP_EOH_SHIFT) | |
b445db44 | 36 | #define CIP_EOH_MASK 0x80000000 |
9a2820c1 TS |
37 | #define CIP_SID_SHIFT 24 |
38 | #define CIP_SID_MASK 0x3f000000 | |
39 | #define CIP_DBS_MASK 0x00ff0000 | |
40 | #define CIP_DBS_SHIFT 16 | |
9863874f TS |
41 | #define CIP_SPH_MASK 0x00000400 |
42 | #define CIP_SPH_SHIFT 10 | |
9a2820c1 TS |
43 | #define CIP_DBC_MASK 0x000000ff |
44 | #define CIP_FMT_SHIFT 24 | |
b445db44 | 45 | #define CIP_FMT_MASK 0x3f000000 |
9a2820c1 TS |
46 | #define CIP_FDF_MASK 0x00ff0000 |
47 | #define CIP_FDF_SHIFT 16 | |
b445db44 TS |
48 | #define CIP_SYT_MASK 0x0000ffff |
49 | #define CIP_SYT_NO_INFO 0xffff | |
b445db44 | 50 | |
51c29fd2 | 51 | /* Audio and Music transfer protocol specific parameters */ |
414ba022 | 52 | #define CIP_FMT_AM 0x10 |
2b3fc456 | 53 | #define AMDTP_FDF_NO_DATA 0xff |
31ef9134 CL |
54 | |
55 | /* TODO: make these configurable */ | |
56 | #define INTERRUPT_INTERVAL 16 | |
57 | #define QUEUE_LENGTH 48 | |
58 | ||
2b3fc456 | 59 | #define IN_PACKET_HEADER_SIZE 4 |
4b7da117 TS |
60 | #define OUT_PACKET_HEADER_SIZE 0 |
61 | ||
76fb8789 CL |
62 | static void pcm_period_tasklet(unsigned long data); |
63 | ||
31ef9134 | 64 | /** |
be4a2894 TS |
65 | * amdtp_stream_init - initialize an AMDTP stream structure |
66 | * @s: the AMDTP stream to initialize | |
31ef9134 | 67 | * @unit: the target of the stream |
3ff7e8f0 | 68 | * @dir: the direction of stream |
31ef9134 | 69 | * @flags: the packet transmission method to use |
5955815e | 70 | * @fmt: the value of fmt field in CIP header |
df075fee TS |
71 | * @process_data_blocks: callback handler to process data blocks |
72 | * @protocol_size: the size to allocate newly for protocol | |
31ef9134 | 73 | */ |
be4a2894 | 74 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
5955815e | 75 | enum amdtp_stream_direction dir, enum cip_flags flags, |
df075fee TS |
76 | unsigned int fmt, |
77 | amdtp_stream_process_data_blocks_t process_data_blocks, | |
78 | unsigned int protocol_size) | |
31ef9134 | 79 | { |
df075fee TS |
80 | if (process_data_blocks == NULL) |
81 | return -EINVAL; | |
82 | ||
83 | s->protocol = kzalloc(protocol_size, GFP_KERNEL); | |
84 | if (!s->protocol) | |
85 | return -ENOMEM; | |
86 | ||
c6f224dc | 87 | s->unit = unit; |
3ff7e8f0 | 88 | s->direction = dir; |
31ef9134 CL |
89 | s->flags = flags; |
90 | s->context = ERR_PTR(-1); | |
91 | mutex_init(&s->mutex); | |
76fb8789 | 92 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 93 | s->packet_index = 0; |
31ef9134 | 94 | |
7b3b0d85 TS |
95 | init_waitqueue_head(&s->callback_wait); |
96 | s->callbacked = false; | |
7b3b0d85 | 97 | |
5955815e | 98 | s->fmt = fmt; |
df075fee | 99 | s->process_data_blocks = process_data_blocks; |
414ba022 | 100 | |
31ef9134 CL |
101 | return 0; |
102 | } | |
be4a2894 | 103 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
104 | |
105 | /** | |
be4a2894 TS |
106 | * amdtp_stream_destroy - free stream resources |
107 | * @s: the AMDTP stream to destroy | |
31ef9134 | 108 | */ |
be4a2894 | 109 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 110 | { |
44c376b9 TS |
111 | /* Not initialized. */ |
112 | if (s->protocol == NULL) | |
113 | return; | |
114 | ||
be4a2894 | 115 | WARN_ON(amdtp_stream_running(s)); |
df075fee | 116 | kfree(s->protocol); |
31ef9134 | 117 | mutex_destroy(&s->mutex); |
31ef9134 | 118 | } |
be4a2894 | 119 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 120 | |
c5280e99 | 121 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
122 | [CIP_SFC_32000] = 8, |
123 | [CIP_SFC_44100] = 8, | |
124 | [CIP_SFC_48000] = 8, | |
125 | [CIP_SFC_88200] = 16, | |
126 | [CIP_SFC_96000] = 16, | |
127 | [CIP_SFC_176400] = 32, | |
128 | [CIP_SFC_192000] = 32, | |
129 | }; | |
130 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
131 | ||
f9503a68 | 132 | const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = { |
1017abed TS |
133 | [CIP_SFC_32000] = 32000, |
134 | [CIP_SFC_44100] = 44100, | |
135 | [CIP_SFC_48000] = 48000, | |
136 | [CIP_SFC_88200] = 88200, | |
137 | [CIP_SFC_96000] = 96000, | |
138 | [CIP_SFC_176400] = 176400, | |
139 | [CIP_SFC_192000] = 192000, | |
140 | }; | |
141 | EXPORT_SYMBOL(amdtp_rate_table); | |
142 | ||
7b2d99fa TS |
143 | /** |
144 | * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream | |
145 | * @s: the AMDTP stream, which must be initialized. | |
146 | * @runtime: the PCM substream runtime | |
147 | */ | |
148 | int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, | |
149 | struct snd_pcm_runtime *runtime) | |
150 | { | |
55799c5a | 151 | struct snd_pcm_hardware *hw = &runtime->hw; |
7b2d99fa TS |
152 | int err; |
153 | ||
55799c5a TS |
154 | hw->info = SNDRV_PCM_INFO_BATCH | |
155 | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
156 | SNDRV_PCM_INFO_INTERLEAVED | | |
157 | SNDRV_PCM_INFO_JOINT_DUPLEX | | |
158 | SNDRV_PCM_INFO_MMAP | | |
159 | SNDRV_PCM_INFO_MMAP_VALID; | |
160 | ||
161 | /* SNDRV_PCM_INFO_BATCH */ | |
162 | hw->periods_min = 2; | |
163 | hw->periods_max = UINT_MAX; | |
164 | ||
165 | /* bytes for a frame */ | |
166 | hw->period_bytes_min = 4 * hw->channels_max; | |
167 | ||
168 | /* Just to prevent from allocating much pages. */ | |
169 | hw->period_bytes_max = hw->period_bytes_min * 2048; | |
170 | hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; | |
171 | ||
7b2d99fa TS |
172 | /* |
173 | * Currently firewire-lib processes 16 packets in one software | |
174 | * interrupt callback. This equals to 2msec but actually the | |
175 | * interval of the interrupts has a jitter. | |
176 | * Additionally, even if adding a constraint to fit period size to | |
177 | * 2msec, actual calculated frames per period doesn't equal to 2msec, | |
178 | * depending on sampling rate. | |
179 | * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec. | |
180 | * Here let us use 5msec for safe period interrupt. | |
181 | */ | |
182 | err = snd_pcm_hw_constraint_minmax(runtime, | |
183 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
184 | 5000, UINT_MAX); | |
185 | if (err < 0) | |
186 | goto end; | |
187 | ||
188 | /* Non-Blocking stream has no more constraints */ | |
189 | if (!(s->flags & CIP_BLOCKING)) | |
190 | goto end; | |
191 | ||
192 | /* | |
193 | * One AMDTP packet can include some frames. In blocking mode, the | |
194 | * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, | |
195 | * depending on its sampling rate. For accurate period interrupt, it's | |
ce991981 | 196 | * preferrable to align period/buffer sizes to current SYT_INTERVAL. |
7b2d99fa | 197 | * |
ce991981 YG |
198 | * TODO: These constraints can be improved with proper rules. |
199 | * Currently apply LCM of SYT_INTERVALs. | |
7b2d99fa TS |
200 | */ |
201 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
202 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32); | |
203 | if (err < 0) | |
204 | goto end; | |
205 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
206 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32); | |
207 | end: | |
208 | return err; | |
209 | } | |
210 | EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); | |
211 | ||
31ef9134 | 212 | /** |
be4a2894 TS |
213 | * amdtp_stream_set_parameters - set stream parameters |
214 | * @s: the AMDTP stream to configure | |
31ef9134 | 215 | * @rate: the sample rate |
df075fee | 216 | * @data_block_quadlets: the size of a data block in quadlet unit |
31ef9134 | 217 | * |
a7304e3b | 218 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
219 | * changed while the stream is running. |
220 | */ | |
df075fee TS |
221 | int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, |
222 | unsigned int data_block_quadlets) | |
31ef9134 | 223 | { |
df075fee | 224 | unsigned int sfc; |
31ef9134 | 225 | |
547e631c | 226 | for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) { |
1017abed | 227 | if (amdtp_rate_table[sfc] == rate) |
547e631c TS |
228 | break; |
229 | } | |
230 | if (sfc == ARRAY_SIZE(amdtp_rate_table)) | |
231 | return -EINVAL; | |
e84d15f6 | 232 | |
e84d15f6 | 233 | s->sfc = sfc; |
df075fee | 234 | s->data_block_quadlets = data_block_quadlets; |
a7304e3b | 235 | s->syt_interval = amdtp_syt_intervals[sfc]; |
e84d15f6 CL |
236 | |
237 | /* default buffering in the device */ | |
238 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
239 | if (s->flags & CIP_BLOCKING) | |
240 | /* additional buffering needed to adjust for no-data packets */ | |
241 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
77d2a8a4 | 242 | |
547e631c | 243 | return 0; |
31ef9134 | 244 | } |
be4a2894 | 245 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
246 | |
247 | /** | |
be4a2894 TS |
248 | * amdtp_stream_get_max_payload - get the stream's packet size |
249 | * @s: the AMDTP stream | |
31ef9134 CL |
250 | * |
251 | * This function must not be called before the stream has been configured | |
be4a2894 | 252 | * with amdtp_stream_set_parameters(). |
31ef9134 | 253 | */ |
be4a2894 | 254 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 255 | { |
a2064710 | 256 | unsigned int multiplier = 1; |
3b196c39 | 257 | unsigned int header_size = 0; |
a2064710 TS |
258 | |
259 | if (s->flags & CIP_JUMBO_PAYLOAD) | |
260 | multiplier = 5; | |
3b196c39 TS |
261 | if (!(s->flags & CIP_NO_HEADER)) |
262 | header_size = 8; | |
a2064710 | 263 | |
3b196c39 TS |
264 | return header_size + |
265 | s->syt_interval * s->data_block_quadlets * 4 * multiplier; | |
31ef9134 | 266 | } |
be4a2894 | 267 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 268 | |
76fb8789 | 269 | /** |
be4a2894 TS |
270 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
271 | * @s: the AMDTP stream | |
76fb8789 CL |
272 | * |
273 | * This function should be called from the PCM device's .prepare callback. | |
274 | */ | |
be4a2894 | 275 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
276 | { |
277 | tasklet_kill(&s->period_tasklet); | |
278 | s->pcm_buffer_pointer = 0; | |
279 | s->pcm_period_pointer = 0; | |
280 | } | |
be4a2894 | 281 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 282 | |
875be091 TS |
283 | static unsigned int calculate_data_blocks(struct amdtp_stream *s, |
284 | unsigned int syt) | |
31ef9134 CL |
285 | { |
286 | unsigned int phase, data_blocks; | |
287 | ||
875be091 TS |
288 | /* Blocking mode. */ |
289 | if (s->flags & CIP_BLOCKING) { | |
290 | /* This module generate empty packet for 'no data'. */ | |
291 | if (syt == CIP_SYT_NO_INFO) | |
292 | data_blocks = 0; | |
293 | else | |
294 | data_blocks = s->syt_interval; | |
295 | /* Non-blocking mode. */ | |
31ef9134 | 296 | } else { |
875be091 TS |
297 | if (!cip_sfc_is_base_44100(s->sfc)) { |
298 | /* Sample_rate / 8000 is an integer, and precomputed. */ | |
299 | data_blocks = s->data_block_state; | |
300 | } else { | |
301 | phase = s->data_block_state; | |
31ef9134 CL |
302 | |
303 | /* | |
304 | * This calculates the number of data blocks per packet so that | |
305 | * 1) the overall rate is correct and exactly synchronized to | |
306 | * the bus clock, and | |
307 | * 2) packets with a rounded-up number of blocks occur as early | |
308 | * as possible in the sequence (to prevent underruns of the | |
309 | * device's buffer). | |
310 | */ | |
875be091 TS |
311 | if (s->sfc == CIP_SFC_44100) |
312 | /* 6 6 5 6 5 6 5 ... */ | |
313 | data_blocks = 5 + ((phase & 1) ^ | |
314 | (phase == 0 || phase >= 40)); | |
315 | else | |
316 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
317 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
318 | if (++phase >= (80 >> (s->sfc >> 1))) | |
319 | phase = 0; | |
320 | s->data_block_state = phase; | |
321 | } | |
31ef9134 CL |
322 | } |
323 | ||
324 | return data_blocks; | |
325 | } | |
326 | ||
be4a2894 | 327 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
328 | unsigned int cycle) |
329 | { | |
330 | unsigned int syt_offset, phase, index, syt; | |
331 | ||
332 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
333 | if (!cip_sfc_is_base_44100(s->sfc)) | |
334 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
335 | else { | |
336 | /* | |
337 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
338 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
339 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
340 | * elements is about 1386.23. Rounding the results of this | |
341 | * formula to the SYT precision results in a sequence of | |
342 | * differences that begins with: | |
343 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
344 | * This code generates _exactly_ the same sequence. | |
345 | */ | |
346 | phase = s->syt_offset_state; | |
347 | index = phase % 13; | |
348 | syt_offset = s->last_syt_offset; | |
349 | syt_offset += 1386 + ((index && !(index & 3)) || | |
350 | phase == 146); | |
351 | if (++phase >= 147) | |
352 | phase = 0; | |
353 | s->syt_offset_state = phase; | |
354 | } | |
355 | } else | |
356 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
357 | s->last_syt_offset = syt_offset; | |
358 | ||
be454366 | 359 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 360 | syt_offset += s->transfer_delay; |
be454366 CL |
361 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
362 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 363 | |
b445db44 | 364 | return syt & CIP_SYT_MASK; |
be454366 | 365 | } else { |
b445db44 | 366 | return CIP_SYT_NO_INFO; |
be454366 | 367 | } |
31ef9134 CL |
368 | } |
369 | ||
4b7da117 TS |
370 | static void update_pcm_pointers(struct amdtp_stream *s, |
371 | struct snd_pcm_substream *pcm, | |
372 | unsigned int frames) | |
65845f29 TS |
373 | { |
374 | unsigned int ptr; | |
375 | ||
4b7da117 TS |
376 | ptr = s->pcm_buffer_pointer + frames; |
377 | if (ptr >= pcm->runtime->buffer_size) | |
378 | ptr -= pcm->runtime->buffer_size; | |
6aa7de05 | 379 | WRITE_ONCE(s->pcm_buffer_pointer, ptr); |
4b7da117 TS |
380 | |
381 | s->pcm_period_pointer += frames; | |
382 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
383 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
4b7da117 TS |
384 | tasklet_hi_schedule(&s->period_tasklet); |
385 | } | |
386 | } | |
387 | ||
388 | static void pcm_period_tasklet(unsigned long data) | |
389 | { | |
390 | struct amdtp_stream *s = (void *)data; | |
6aa7de05 | 391 | struct snd_pcm_substream *pcm = READ_ONCE(s->pcm); |
4b7da117 TS |
392 | |
393 | if (pcm) | |
394 | snd_pcm_period_elapsed(pcm); | |
395 | } | |
396 | ||
ff38e0c7 TS |
397 | static int queue_packet(struct amdtp_stream *s, unsigned int header_length, |
398 | unsigned int payload_length) | |
4b7da117 TS |
399 | { |
400 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
401 | int err = 0; |
402 | ||
403 | if (IS_ERR(s->context)) | |
404 | goto end; | |
4b7da117 TS |
405 | |
406 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
3b196c39 | 407 | p.tag = s->tag; |
4b7da117 | 408 | p.header_length = header_length; |
ff38e0c7 TS |
409 | if (payload_length > 0) |
410 | p.payload_length = payload_length; | |
411 | else | |
412 | p.skip = true; | |
4b7da117 TS |
413 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, |
414 | s->buffer.packets[s->packet_index].offset); | |
415 | if (err < 0) { | |
416 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
417 | goto end; | |
418 | } | |
419 | ||
420 | if (++s->packet_index >= QUEUE_LENGTH) | |
421 | s->packet_index = 0; | |
422 | end: | |
423 | return err; | |
424 | } | |
425 | ||
426 | static inline int queue_out_packet(struct amdtp_stream *s, | |
ff38e0c7 | 427 | unsigned int payload_length) |
4b7da117 | 428 | { |
ff38e0c7 | 429 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, payload_length); |
4b7da117 TS |
430 | } |
431 | ||
2b3fc456 TS |
432 | static inline int queue_in_packet(struct amdtp_stream *s) |
433 | { | |
f91c9d76 | 434 | return queue_packet(s, IN_PACKET_HEADER_SIZE, s->max_payload_length); |
2b3fc456 TS |
435 | } |
436 | ||
ff0fb5aa TS |
437 | static int handle_out_packet(struct amdtp_stream *s, |
438 | unsigned int payload_length, unsigned int cycle, | |
a9c4284b | 439 | unsigned int index) |
31ef9134 CL |
440 | { |
441 | __be32 *buffer; | |
390a1512 TS |
442 | unsigned int syt; |
443 | unsigned int data_blocks; | |
20e44577 | 444 | unsigned int pcm_frames; |
31ef9134 | 445 | struct snd_pcm_substream *pcm; |
31ef9134 | 446 | |
ccccad86 | 447 | buffer = s->buffer.packets[s->packet_index].buffer; |
390a1512 TS |
448 | syt = calculate_syt(s, cycle); |
449 | data_blocks = calculate_data_blocks(s, syt); | |
df075fee | 450 | pcm_frames = s->process_data_blocks(s, buffer + 2, data_blocks, &syt); |
20e44577 | 451 | |
9dae017b TS |
452 | if (s->flags & CIP_DBC_IS_END_EVENT) |
453 | s->data_block_counter = | |
454 | (s->data_block_counter + data_blocks) & 0xff; | |
455 | ||
6aa7de05 | 456 | buffer[0] = cpu_to_be32(READ_ONCE(s->source_node_id_field) | |
9a2820c1 | 457 | (s->data_block_quadlets << CIP_DBS_SHIFT) | |
9863874f | 458 | ((s->sph << CIP_SPH_SHIFT) & CIP_SPH_MASK) | |
31ef9134 | 459 | s->data_block_counter); |
414ba022 TS |
460 | buffer[1] = cpu_to_be32(CIP_EOH | |
461 | ((s->fmt << CIP_FMT_SHIFT) & CIP_FMT_MASK) | | |
462 | ((s->fdf << CIP_FDF_SHIFT) & CIP_FDF_MASK) | | |
463 | (syt & CIP_SYT_MASK)); | |
31ef9134 | 464 | |
9dae017b TS |
465 | if (!(s->flags & CIP_DBC_IS_END_EVENT)) |
466 | s->data_block_counter = | |
467 | (s->data_block_counter + data_blocks) & 0xff; | |
4b7da117 | 468 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
0c95c1d6 | 469 | |
a9c4284b | 470 | trace_out_packet(s, cycle, buffer, payload_length, index); |
0c95c1d6 | 471 | |
ff38e0c7 | 472 | if (queue_out_packet(s, payload_length) < 0) |
a4103bd7 | 473 | return -EIO; |
31ef9134 | 474 | |
6aa7de05 | 475 | pcm = READ_ONCE(s->pcm); |
20e44577 TS |
476 | if (pcm && pcm_frames > 0) |
477 | update_pcm_pointers(s, pcm, pcm_frames); | |
a4103bd7 TS |
478 | |
479 | /* No need to return the number of handled data blocks. */ | |
480 | return 0; | |
76fb8789 CL |
481 | } |
482 | ||
3b196c39 TS |
483 | static int handle_out_packet_without_header(struct amdtp_stream *s, |
484 | unsigned int payload_length, unsigned int cycle, | |
485 | unsigned int index) | |
486 | { | |
487 | __be32 *buffer; | |
488 | unsigned int syt; | |
489 | unsigned int data_blocks; | |
490 | unsigned int pcm_frames; | |
491 | struct snd_pcm_substream *pcm; | |
492 | ||
493 | buffer = s->buffer.packets[s->packet_index].buffer; | |
494 | syt = calculate_syt(s, cycle); | |
495 | data_blocks = calculate_data_blocks(s, syt); | |
496 | pcm_frames = s->process_data_blocks(s, buffer, data_blocks, &syt); | |
497 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
498 | ||
499 | payload_length = data_blocks * 4 * s->data_block_quadlets; | |
b164d2fd TS |
500 | |
501 | trace_out_packet_without_header(s, cycle, payload_length, data_blocks, | |
502 | index); | |
503 | ||
3b196c39 TS |
504 | if (queue_out_packet(s, payload_length) < 0) |
505 | return -EIO; | |
506 | ||
6aa7de05 | 507 | pcm = READ_ONCE(s->pcm); |
3b196c39 TS |
508 | if (pcm && pcm_frames > 0) |
509 | update_pcm_pointers(s, pcm, pcm_frames); | |
510 | ||
511 | /* No need to return the number of handled data blocks. */ | |
512 | return 0; | |
513 | } | |
514 | ||
6fc6b9ce | 515 | static int handle_in_packet(struct amdtp_stream *s, |
ff0fb5aa | 516 | unsigned int payload_length, unsigned int cycle, |
a9c4284b | 517 | unsigned int index) |
2b3fc456 | 518 | { |
d9a16fc9 | 519 | __be32 *buffer; |
2b3fc456 | 520 | u32 cip_header[2]; |
9863874f | 521 | unsigned int sph, fmt, fdf, syt; |
6fc6b9ce | 522 | unsigned int data_block_quadlets, data_block_counter, dbc_interval; |
d9a16fc9 | 523 | unsigned int data_blocks; |
20e44577 TS |
524 | struct snd_pcm_substream *pcm; |
525 | unsigned int pcm_frames; | |
c8bdf49b | 526 | bool lost; |
2b3fc456 | 527 | |
d9a16fc9 | 528 | buffer = s->buffer.packets[s->packet_index].buffer; |
2b3fc456 TS |
529 | cip_header[0] = be32_to_cpu(buffer[0]); |
530 | cip_header[1] = be32_to_cpu(buffer[1]); | |
531 | ||
ff0fb5aa | 532 | trace_in_packet(s, cycle, cip_header, payload_length, index); |
0c95c1d6 | 533 | |
2b3fc456 TS |
534 | /* |
535 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 536 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 | 537 | */ |
2128f78f TS |
538 | if ((((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || |
539 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH)) && | |
540 | (!(s->flags & CIP_HEADER_WITHOUT_EOH))) { | |
2b3fc456 TS |
541 | dev_info_ratelimited(&s->unit->device, |
542 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
543 | cip_header[0], cip_header[1]); | |
d9a16fc9 | 544 | data_blocks = 0; |
20e44577 | 545 | pcm_frames = 0; |
2b3fc456 TS |
546 | goto end; |
547 | } | |
548 | ||
414ba022 | 549 | /* Check valid protocol or not. */ |
9863874f | 550 | sph = (cip_header[0] & CIP_SPH_MASK) >> CIP_SPH_SHIFT; |
414ba022 | 551 | fmt = (cip_header[1] & CIP_FMT_MASK) >> CIP_FMT_SHIFT; |
9863874f | 552 | if (sph != s->sph || fmt != s->fmt) { |
2a7e1713 TS |
553 | dev_info_ratelimited(&s->unit->device, |
554 | "Detect unexpected protocol: %08x %08x\n", | |
555 | cip_header[0], cip_header[1]); | |
d9a16fc9 | 556 | data_blocks = 0; |
2a7e1713 TS |
557 | pcm_frames = 0; |
558 | goto end; | |
414ba022 TS |
559 | } |
560 | ||
2b3fc456 | 561 | /* Calculate data blocks */ |
414ba022 | 562 | fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT; |
ff0fb5aa | 563 | if (payload_length < 12 || |
414ba022 | 564 | (fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) { |
d9a16fc9 | 565 | data_blocks = 0; |
2b3fc456 TS |
566 | } else { |
567 | data_block_quadlets = | |
9a2820c1 | 568 | (cip_header[0] & CIP_DBS_MASK) >> CIP_DBS_SHIFT; |
2b3fc456 TS |
569 | /* avoid division by zero */ |
570 | if (data_block_quadlets == 0) { | |
12e0f438 | 571 | dev_err(&s->unit->device, |
2b3fc456 TS |
572 | "Detect invalid value in dbs field: %08X\n", |
573 | cip_header[0]); | |
a9007054 | 574 | return -EPROTO; |
2b3fc456 | 575 | } |
69702239 TS |
576 | if (s->flags & CIP_WRONG_DBS) |
577 | data_block_quadlets = s->data_block_quadlets; | |
2b3fc456 | 578 | |
ff0fb5aa TS |
579 | data_blocks = (payload_length / 4 - 2) / |
580 | data_block_quadlets; | |
2b3fc456 TS |
581 | } |
582 | ||
583 | /* Check data block counter continuity */ | |
9a2820c1 | 584 | data_block_counter = cip_header[0] & CIP_DBC_MASK; |
d9a16fc9 | 585 | if (data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && |
9d59124c TS |
586 | s->data_block_counter != UINT_MAX) |
587 | data_block_counter = s->data_block_counter; | |
588 | ||
18f5ed36 TS |
589 | if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) && |
590 | data_block_counter == s->tx_first_dbc) || | |
591 | s->data_block_counter == UINT_MAX) { | |
b84b1a27 TS |
592 | lost = false; |
593 | } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { | |
c8bdf49b | 594 | lost = data_block_counter != s->data_block_counter; |
d9cd0065 | 595 | } else { |
d9a16fc9 | 596 | if (data_blocks > 0 && s->tx_dbc_interval > 0) |
d9cd0065 TS |
597 | dbc_interval = s->tx_dbc_interval; |
598 | else | |
d9a16fc9 | 599 | dbc_interval = data_blocks; |
d9cd0065 | 600 | |
c8bdf49b | 601 | lost = data_block_counter != |
d9cd0065 TS |
602 | ((s->data_block_counter + dbc_interval) & 0xff); |
603 | } | |
c8bdf49b TS |
604 | |
605 | if (lost) { | |
12e0f438 TS |
606 | dev_err(&s->unit->device, |
607 | "Detect discontinuity of CIP: %02X %02X\n", | |
608 | s->data_block_counter, data_block_counter); | |
6fc6b9ce | 609 | return -EIO; |
2b3fc456 TS |
610 | } |
611 | ||
d9a16fc9 TS |
612 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; |
613 | pcm_frames = s->process_data_blocks(s, buffer + 2, data_blocks, &syt); | |
2b3fc456 | 614 | |
c8bdf49b TS |
615 | if (s->flags & CIP_DBC_IS_END_EVENT) |
616 | s->data_block_counter = data_block_counter; | |
617 | else | |
618 | s->data_block_counter = | |
d9a16fc9 | 619 | (data_block_counter + data_blocks) & 0xff; |
2b3fc456 TS |
620 | end: |
621 | if (queue_in_packet(s) < 0) | |
6fc6b9ce | 622 | return -EIO; |
2b3fc456 | 623 | |
6aa7de05 | 624 | pcm = READ_ONCE(s->pcm); |
20e44577 TS |
625 | if (pcm && pcm_frames > 0) |
626 | update_pcm_pointers(s, pcm, pcm_frames); | |
2b3fc456 | 627 | |
31ea49ba | 628 | return 0; |
2b3fc456 TS |
629 | } |
630 | ||
3b196c39 TS |
631 | static int handle_in_packet_without_header(struct amdtp_stream *s, |
632 | unsigned int payload_quadlets, unsigned int cycle, | |
633 | unsigned int index) | |
634 | { | |
635 | __be32 *buffer; | |
636 | unsigned int data_blocks; | |
637 | struct snd_pcm_substream *pcm; | |
638 | unsigned int pcm_frames; | |
639 | ||
640 | buffer = s->buffer.packets[s->packet_index].buffer; | |
641 | data_blocks = payload_quadlets / s->data_block_quadlets; | |
b164d2fd TS |
642 | |
643 | trace_in_packet_without_header(s, cycle, payload_quadlets, data_blocks, | |
644 | index); | |
645 | ||
3b196c39 TS |
646 | pcm_frames = s->process_data_blocks(s, buffer, data_blocks, NULL); |
647 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
648 | ||
649 | if (queue_in_packet(s) < 0) | |
650 | return -EIO; | |
651 | ||
6aa7de05 | 652 | pcm = READ_ONCE(s->pcm); |
3b196c39 TS |
653 | if (pcm && pcm_frames > 0) |
654 | update_pcm_pointers(s, pcm, pcm_frames); | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
73fc7f08 TS |
659 | /* |
660 | * In CYCLE_TIMER register of IEEE 1394, 7 bits are used to represent second. On | |
661 | * the other hand, in DMA descriptors of 1394 OHCI, 3 bits are used to represent | |
662 | * it. Thus, via Linux firewire subsystem, we can get the 3 bits for second. | |
663 | */ | |
664 | static inline u32 compute_cycle_count(u32 tstamp) | |
665 | { | |
666 | return (((tstamp >> 13) & 0x07) * 8000) + (tstamp & 0x1fff); | |
667 | } | |
668 | ||
669 | static inline u32 increment_cycle_count(u32 cycle, unsigned int addend) | |
670 | { | |
671 | cycle += addend; | |
672 | if (cycle >= 8 * CYCLES_PER_SECOND) | |
673 | cycle -= 8 * CYCLES_PER_SECOND; | |
674 | return cycle; | |
675 | } | |
676 | ||
f90e2ded TS |
677 | static inline u32 decrement_cycle_count(u32 cycle, unsigned int subtrahend) |
678 | { | |
679 | if (cycle < subtrahend) | |
680 | cycle += 8 * CYCLES_PER_SECOND; | |
681 | return cycle - subtrahend; | |
682 | } | |
683 | ||
73fc7f08 | 684 | static void out_stream_callback(struct fw_iso_context *context, u32 tstamp, |
4b7da117 TS |
685 | size_t header_length, void *header, |
686 | void *private_data) | |
31ef9134 | 687 | { |
be4a2894 | 688 | struct amdtp_stream *s = private_data; |
390a1512 | 689 | unsigned int i, packets = header_length / 4; |
73fc7f08 | 690 | u32 cycle; |
31ef9134 | 691 | |
a4103bd7 TS |
692 | if (s->packet_index < 0) |
693 | return; | |
694 | ||
73fc7f08 TS |
695 | cycle = compute_cycle_count(tstamp); |
696 | ||
697 | /* Align to actual cycle count for the last packet. */ | |
698 | cycle = increment_cycle_count(cycle, QUEUE_LENGTH - packets); | |
31ef9134 | 699 | |
ccccad86 | 700 | for (i = 0; i < packets; ++i) { |
73fc7f08 | 701 | cycle = increment_cycle_count(cycle, 1); |
3b196c39 | 702 | if (s->handle_packet(s, 0, cycle, i) < 0) { |
a4103bd7 | 703 | s->packet_index = -1; |
4a9bfafc TS |
704 | if (in_interrupt()) |
705 | amdtp_stream_pcm_abort(s); | |
706 | WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN); | |
a4103bd7 TS |
707 | return; |
708 | } | |
ccccad86 | 709 | } |
a4103bd7 | 710 | |
13882a82 | 711 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
712 | } |
713 | ||
73fc7f08 | 714 | static void in_stream_callback(struct fw_iso_context *context, u32 tstamp, |
2b3fc456 TS |
715 | size_t header_length, void *header, |
716 | void *private_data) | |
717 | { | |
718 | struct amdtp_stream *s = private_data; | |
d9a16fc9 | 719 | unsigned int i, packets; |
ff0fb5aa | 720 | unsigned int payload_length, max_payload_length; |
d9a16fc9 | 721 | __be32 *headers = header; |
f90e2ded | 722 | u32 cycle; |
2b3fc456 | 723 | |
a4103bd7 TS |
724 | if (s->packet_index < 0) |
725 | return; | |
726 | ||
2b3fc456 TS |
727 | /* The number of packets in buffer */ |
728 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
729 | ||
f90e2ded TS |
730 | cycle = compute_cycle_count(tstamp); |
731 | ||
732 | /* Align to actual cycle count for the last packet. */ | |
733 | cycle = decrement_cycle_count(cycle, packets); | |
734 | ||
a2064710 | 735 | /* For buffer-over-run prevention. */ |
f91c9d76 | 736 | max_payload_length = s->max_payload_length; |
a2064710 | 737 | |
d9a16fc9 | 738 | for (i = 0; i < packets; i++) { |
f90e2ded | 739 | cycle = increment_cycle_count(cycle, 1); |
2b3fc456 | 740 | |
f91c9d76 | 741 | /* The number of bytes in this packet */ |
ff0fb5aa TS |
742 | payload_length = |
743 | (be32_to_cpu(headers[i]) >> ISO_DATA_LENGTH_SHIFT); | |
744 | if (payload_length > max_payload_length) { | |
a2064710 | 745 | dev_err(&s->unit->device, |
ff0fb5aa TS |
746 | "Detect jumbo payload: %04x %04x\n", |
747 | payload_length, max_payload_length); | |
a2064710 TS |
748 | break; |
749 | } | |
750 | ||
3b196c39 | 751 | if (s->handle_packet(s, payload_length, cycle, i) < 0) |
6fc6b9ce | 752 | break; |
2b3fc456 TS |
753 | } |
754 | ||
dec63cc8 | 755 | /* Queueing error or detecting invalid payload. */ |
d9a16fc9 | 756 | if (i < packets) { |
dec63cc8 | 757 | s->packet_index = -1; |
4a9bfafc TS |
758 | if (in_interrupt()) |
759 | amdtp_stream_pcm_abort(s); | |
760 | WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN); | |
7b3b0d85 TS |
761 | return; |
762 | } | |
763 | ||
2b3fc456 TS |
764 | fw_iso_context_queue_flush(s->context); |
765 | } | |
766 | ||
7b3b0d85 TS |
767 | /* this is executed one time */ |
768 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
73fc7f08 | 769 | u32 tstamp, size_t header_length, |
7b3b0d85 TS |
770 | void *header, void *private_data) |
771 | { | |
772 | struct amdtp_stream *s = private_data; | |
a04513f8 TS |
773 | u32 cycle; |
774 | unsigned int packets; | |
7b3b0d85 | 775 | |
f91c9d76 TS |
776 | s->max_payload_length = amdtp_stream_get_max_payload(s); |
777 | ||
7b3b0d85 TS |
778 | /* |
779 | * For in-stream, first packet has come. | |
780 | * For out-stream, prepared to transmit first packet | |
781 | */ | |
782 | s->callbacked = true; | |
783 | wake_up(&s->callback_wait); | |
784 | ||
a04513f8 TS |
785 | cycle = compute_cycle_count(tstamp); |
786 | ||
787 | if (s->direction == AMDTP_IN_STREAM) { | |
788 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
789 | cycle = decrement_cycle_count(cycle, packets); | |
7b3b0d85 | 790 | context->callback.sc = in_stream_callback; |
3b196c39 TS |
791 | if (s->flags & CIP_NO_HEADER) |
792 | s->handle_packet = handle_in_packet_without_header; | |
793 | else | |
794 | s->handle_packet = handle_in_packet; | |
a04513f8 TS |
795 | } else { |
796 | packets = header_length / 4; | |
797 | cycle = increment_cycle_count(cycle, QUEUE_LENGTH - packets); | |
7b3b0d85 | 798 | context->callback.sc = out_stream_callback; |
3b196c39 TS |
799 | if (s->flags & CIP_NO_HEADER) |
800 | s->handle_packet = handle_out_packet_without_header; | |
801 | else | |
802 | s->handle_packet = handle_out_packet; | |
a04513f8 TS |
803 | } |
804 | ||
805 | s->start_cycle = cycle; | |
7b3b0d85 | 806 | |
73fc7f08 | 807 | context->callback.sc(context, tstamp, header_length, header, s); |
7b3b0d85 TS |
808 | } |
809 | ||
31ef9134 | 810 | /** |
be4a2894 TS |
811 | * amdtp_stream_start - start transferring packets |
812 | * @s: the AMDTP stream to start | |
31ef9134 CL |
813 | * @channel: the isochronous channel on the bus |
814 | * @speed: firewire speed code | |
815 | * | |
816 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
817 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
818 | * device can be started. | |
31ef9134 | 819 | */ |
be4a2894 | 820 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
821 | { |
822 | static const struct { | |
823 | unsigned int data_block; | |
824 | unsigned int syt_offset; | |
825 | } initial_state[] = { | |
826 | [CIP_SFC_32000] = { 4, 3072 }, | |
827 | [CIP_SFC_48000] = { 6, 1024 }, | |
828 | [CIP_SFC_96000] = { 12, 1024 }, | |
829 | [CIP_SFC_192000] = { 24, 1024 }, | |
830 | [CIP_SFC_44100] = { 0, 67 }, | |
831 | [CIP_SFC_88200] = { 0, 67 }, | |
832 | [CIP_SFC_176400] = { 0, 67 }, | |
833 | }; | |
2b3fc456 TS |
834 | unsigned int header_size; |
835 | enum dma_data_direction dir; | |
7ab56645 | 836 | int type, tag, err; |
31ef9134 CL |
837 | |
838 | mutex_lock(&s->mutex); | |
839 | ||
be4a2894 | 840 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 841 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
842 | err = -EBADFD; |
843 | goto err_unlock; | |
844 | } | |
845 | ||
62f00e40 | 846 | if (s->direction == AMDTP_IN_STREAM) |
b6bc8123 TS |
847 | s->data_block_counter = UINT_MAX; |
848 | else | |
849 | s->data_block_counter = 0; | |
31ef9134 CL |
850 | s->data_block_state = initial_state[s->sfc].data_block; |
851 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
852 | s->last_syt_offset = TICKS_PER_CYCLE; | |
853 | ||
2b3fc456 TS |
854 | /* initialize packet buffer */ |
855 | if (s->direction == AMDTP_IN_STREAM) { | |
856 | dir = DMA_FROM_DEVICE; | |
857 | type = FW_ISO_CONTEXT_RECEIVE; | |
858 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
859 | } else { |
860 | dir = DMA_TO_DEVICE; | |
861 | type = FW_ISO_CONTEXT_TRANSMIT; | |
862 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 863 | } |
31ef9134 | 864 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 865 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
866 | if (err < 0) |
867 | goto err_unlock; | |
868 | ||
869 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 870 | type, channel, speed, header_size, |
7b3b0d85 | 871 | amdtp_stream_first_callback, s); |
31ef9134 CL |
872 | if (IS_ERR(s->context)) { |
873 | err = PTR_ERR(s->context); | |
874 | if (err == -EBUSY) | |
875 | dev_err(&s->unit->device, | |
be4a2894 | 876 | "no free stream on this controller\n"); |
31ef9134 CL |
877 | goto err_buffer; |
878 | } | |
879 | ||
be4a2894 | 880 | amdtp_stream_update(s); |
31ef9134 | 881 | |
3b196c39 TS |
882 | if (s->flags & CIP_NO_HEADER) |
883 | s->tag = TAG_NO_CIP_HEADER; | |
884 | else | |
885 | s->tag = TAG_CIP; | |
886 | ||
ec00f5e4 | 887 | s->packet_index = 0; |
4b7da117 | 888 | do { |
2b3fc456 TS |
889 | if (s->direction == AMDTP_IN_STREAM) |
890 | err = queue_in_packet(s); | |
891 | else | |
ff38e0c7 | 892 | err = queue_out_packet(s, 0); |
4b7da117 TS |
893 | if (err < 0) |
894 | goto err_context; | |
895 | } while (s->packet_index > 0); | |
31ef9134 | 896 | |
2b3fc456 | 897 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7ab56645 | 898 | tag = FW_ISO_CONTEXT_MATCH_TAG1; |
3b196c39 | 899 | if ((s->flags & CIP_EMPTY_WITH_TAG0) || (s->flags & CIP_NO_HEADER)) |
7ab56645 TS |
900 | tag |= FW_ISO_CONTEXT_MATCH_TAG0; |
901 | ||
7b3b0d85 | 902 | s->callbacked = false; |
7ab56645 | 903 | err = fw_iso_context_start(s->context, -1, 0, tag); |
31ef9134 CL |
904 | if (err < 0) |
905 | goto err_context; | |
906 | ||
907 | mutex_unlock(&s->mutex); | |
908 | ||
909 | return 0; | |
910 | ||
911 | err_context: | |
912 | fw_iso_context_destroy(s->context); | |
913 | s->context = ERR_PTR(-1); | |
914 | err_buffer: | |
915 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
916 | err_unlock: | |
917 | mutex_unlock(&s->mutex); | |
918 | ||
919 | return err; | |
920 | } | |
be4a2894 | 921 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 922 | |
e9148ddd | 923 | /** |
be4a2894 TS |
924 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
925 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
926 | * |
927 | * Returns the current buffer position, in frames. | |
928 | */ | |
be4a2894 | 929 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 930 | { |
1dba9db0 TS |
931 | /* |
932 | * This function is called in software IRQ context of period_tasklet or | |
933 | * process context. | |
934 | * | |
935 | * When the software IRQ context was scheduled by software IRQ context | |
936 | * of IR/IT contexts, queued packets were already handled. Therefore, | |
937 | * no need to flush the queue in buffer anymore. | |
938 | * | |
939 | * When the process context reach here, some packets will be already | |
940 | * queued in the buffer. These packets should be handled immediately | |
941 | * to keep better granularity of PCM pointer. | |
942 | * | |
943 | * Later, the process context will sometimes schedules software IRQ | |
944 | * context of the period_tasklet. Then, no need to flush the queue by | |
945 | * the same reason as described for IR/IT contexts. | |
946 | */ | |
947 | if (!in_interrupt() && amdtp_stream_running(s)) | |
92b862c7 | 948 | fw_iso_context_flush_completions(s->context); |
e9148ddd | 949 | |
6aa7de05 | 950 | return READ_ONCE(s->pcm_buffer_pointer); |
e9148ddd | 951 | } |
be4a2894 | 952 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 953 | |
875becf8 TS |
954 | /** |
955 | * amdtp_stream_pcm_ack - acknowledge queued PCM frames | |
956 | * @s: the AMDTP stream that transfers the PCM frames | |
957 | * | |
958 | * Returns zero always. | |
959 | */ | |
960 | int amdtp_stream_pcm_ack(struct amdtp_stream *s) | |
961 | { | |
962 | /* | |
963 | * Process isochronous packets for recent isochronous cycle to handle | |
964 | * queued PCM frames. | |
965 | */ | |
966 | if (amdtp_stream_running(s)) | |
967 | fw_iso_context_flush_completions(s->context); | |
968 | ||
969 | return 0; | |
970 | } | |
971 | EXPORT_SYMBOL(amdtp_stream_pcm_ack); | |
972 | ||
31ef9134 | 973 | /** |
be4a2894 TS |
974 | * amdtp_stream_update - update the stream after a bus reset |
975 | * @s: the AMDTP stream | |
31ef9134 | 976 | */ |
be4a2894 | 977 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 | 978 | { |
9a2820c1 | 979 | /* Precomputing. */ |
6aa7de05 MR |
980 | WRITE_ONCE(s->source_node_id_field, |
981 | (fw_parent_device(s->unit)->card->node_id << CIP_SID_SHIFT) & CIP_SID_MASK); | |
31ef9134 | 982 | } |
be4a2894 | 983 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
984 | |
985 | /** | |
be4a2894 TS |
986 | * amdtp_stream_stop - stop sending packets |
987 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
988 | * |
989 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
990 | * itself can be stopped. | |
991 | */ | |
be4a2894 | 992 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
993 | { |
994 | mutex_lock(&s->mutex); | |
995 | ||
be4a2894 | 996 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
997 | mutex_unlock(&s->mutex); |
998 | return; | |
999 | } | |
1000 | ||
76fb8789 | 1001 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
1002 | fw_iso_context_stop(s->context); |
1003 | fw_iso_context_destroy(s->context); | |
1004 | s->context = ERR_PTR(-1); | |
1005 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
1006 | ||
7b3b0d85 TS |
1007 | s->callbacked = false; |
1008 | ||
31ef9134 CL |
1009 | mutex_unlock(&s->mutex); |
1010 | } | |
be4a2894 | 1011 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
1012 | |
1013 | /** | |
be4a2894 | 1014 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
1015 | * @s: the AMDTP stream about to be stopped |
1016 | * | |
1017 | * If the isochronous stream needs to be stopped asynchronously, call this | |
1018 | * function first to stop the PCM device. | |
1019 | */ | |
be4a2894 | 1020 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
1021 | { |
1022 | struct snd_pcm_substream *pcm; | |
1023 | ||
6aa7de05 | 1024 | pcm = READ_ONCE(s->pcm); |
1fb8510c TI |
1025 | if (pcm) |
1026 | snd_pcm_stop_xrun(pcm); | |
31ef9134 | 1027 | } |
be4a2894 | 1028 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |