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