2 * tascam-stream.c - a part of driver for TASCAM FireWire series
4 * Copyright (c) 2015 Takashi Sakamoto
6 * Licensed under the terms of the GNU General Public License, version 2.
9 #include <linux/delay.h>
12 #define CALLBACK_TIMEOUT 500
14 static int get_clock(struct snd_tscm *tscm, u32 *data)
19 err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST,
20 TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS,
21 ®, sizeof(reg), 0);
23 *data = be32_to_cpu(reg);
28 static int set_clock(struct snd_tscm *tscm, unsigned int rate,
29 enum snd_tscm_clock clock)
35 err = get_clock(tscm, &data);
43 if ((rate % 44100) == 0) {
46 if (rate / 44100 == 2)
48 } else if ((rate % 48000) == 0) {
51 if (rate / 48000 == 2)
58 if (clock != INT_MAX) {
63 reg = cpu_to_be32(data);
65 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
66 TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS,
67 ®, sizeof(reg), 0);
71 if (data & 0x00008000)
72 reg = cpu_to_be32(0x0000001a);
74 reg = cpu_to_be32(0x0000000d);
76 return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
77 TSCM_ADDR_BASE + TSCM_OFFSET_MULTIPLEX_MODE,
78 ®, sizeof(reg), 0);
81 int snd_tscm_stream_get_rate(struct snd_tscm *tscm, unsigned int *rate)
84 unsigned int trials = 0;
87 while (data == 0x0 || trials++ < 5) {
88 err = get_clock(tscm, &data);
92 data = (data & 0xff000000) >> 24;
95 /* Check base rate. */
96 if ((data & 0x0f) == 0x01)
98 else if ((data & 0x0f) == 0x02)
103 /* Check multiplier. */
104 if ((data & 0xf0) == 0x80)
106 else if ((data & 0xf0) != 0x00)
112 int snd_tscm_stream_get_clock(struct snd_tscm *tscm, enum snd_tscm_clock *clock)
117 err = get_clock(tscm, &data);
121 *clock = ((data & 0x00ff0000) >> 16) - 1;
122 if (*clock < 0 || *clock > SND_TSCM_CLOCK_ADAT)
128 static int enable_data_channels(struct snd_tscm *tscm)
136 for (i = 0; i < tscm->spec->pcm_capture_analog_channels; ++i)
138 if (tscm->spec->has_adat)
140 if (tscm->spec->has_spdif)
143 reg = cpu_to_be32(data);
144 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
145 TSCM_ADDR_BASE + TSCM_OFFSET_TX_PCM_CHANNELS,
146 ®, sizeof(reg), 0);
151 for (i = 0; i < tscm->spec->pcm_playback_analog_channels; ++i)
153 if (tscm->spec->has_adat)
155 if (tscm->spec->has_spdif)
158 reg = cpu_to_be32(data);
159 return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
160 TSCM_ADDR_BASE + TSCM_OFFSET_RX_PCM_CHANNELS,
161 ®, sizeof(reg), 0);
164 static int set_stream_formats(struct snd_tscm *tscm, unsigned int rate)
169 /* Set an option for unknown purpose. */
170 reg = cpu_to_be32(0x00200000);
171 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
172 TSCM_ADDR_BASE + TSCM_OFFSET_SET_OPTION,
173 ®, sizeof(reg), 0);
177 err = enable_data_channels(tscm);
181 return set_clock(tscm, rate, INT_MAX);
184 static void finish_session(struct snd_tscm *tscm)
189 snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
190 TSCM_ADDR_BASE + TSCM_OFFSET_START_STREAMING,
191 ®, sizeof(reg), 0);
194 snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
195 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_ON,
196 ®, sizeof(reg), 0);
200 static int begin_session(struct snd_tscm *tscm)
205 reg = cpu_to_be32(0x00000001);
206 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
207 TSCM_ADDR_BASE + TSCM_OFFSET_START_STREAMING,
208 ®, sizeof(reg), 0);
212 reg = cpu_to_be32(0x00000001);
213 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
214 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_ON,
215 ®, sizeof(reg), 0);
219 /* Set an option for unknown purpose. */
220 reg = cpu_to_be32(0x00002000);
221 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
222 TSCM_ADDR_BASE + TSCM_OFFSET_SET_OPTION,
223 ®, sizeof(reg), 0);
227 /* Start multiplexing PCM samples on packets. */
228 reg = cpu_to_be32(0x00000001);
229 return snd_fw_transaction(tscm->unit,
230 TCODE_WRITE_QUADLET_REQUEST,
231 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_ON,
232 ®, sizeof(reg), 0);
235 static void release_resources(struct snd_tscm *tscm)
239 /* Unregister channels. */
240 reg = cpu_to_be32(0x00000000);
241 snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
242 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_CH,
243 ®, sizeof(reg), 0);
244 reg = cpu_to_be32(0x00000000);
245 snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
246 TSCM_ADDR_BASE + TSCM_OFFSET_UNKNOWN,
247 ®, sizeof(reg), 0);
248 reg = cpu_to_be32(0x00000000);
249 snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
250 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_CH,
251 ®, sizeof(reg), 0);
253 /* Release isochronous resources. */
254 fw_iso_resources_free(&tscm->tx_resources);
255 fw_iso_resources_free(&tscm->rx_resources);
258 static int keep_resources(struct snd_tscm *tscm, unsigned int rate)
263 /* Keep resources for in-stream. */
264 err = amdtp_tscm_set_parameters(&tscm->tx_stream, rate);
267 err = fw_iso_resources_allocate(&tscm->tx_resources,
268 amdtp_stream_get_max_payload(&tscm->tx_stream),
269 fw_parent_device(tscm->unit)->max_speed);
273 /* Keep resources for out-stream. */
274 err = amdtp_tscm_set_parameters(&tscm->rx_stream, rate);
277 err = fw_iso_resources_allocate(&tscm->rx_resources,
278 amdtp_stream_get_max_payload(&tscm->rx_stream),
279 fw_parent_device(tscm->unit)->max_speed);
283 /* Register the isochronous channel for transmitting stream. */
284 reg = cpu_to_be32(tscm->tx_resources.channel);
285 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
286 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_CH,
287 ®, sizeof(reg), 0);
292 reg = cpu_to_be32(0x00000002);
293 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
294 TSCM_ADDR_BASE + TSCM_OFFSET_UNKNOWN,
295 ®, sizeof(reg), 0);
299 /* Register the isochronous channel for receiving stream. */
300 reg = cpu_to_be32(tscm->rx_resources.channel);
301 err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
302 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_CH,
303 ®, sizeof(reg), 0);
309 release_resources(tscm);
313 int snd_tscm_stream_init_duplex(struct snd_tscm *tscm)
315 unsigned int pcm_channels;
318 /* For out-stream. */
319 err = fw_iso_resources_init(&tscm->rx_resources, tscm->unit);
322 pcm_channels = tscm->spec->pcm_playback_analog_channels;
323 if (tscm->spec->has_adat)
325 if (tscm->spec->has_spdif)
327 err = amdtp_tscm_init(&tscm->rx_stream, tscm->unit, AMDTP_OUT_STREAM,
333 err = fw_iso_resources_init(&tscm->tx_resources, tscm->unit);
336 pcm_channels = tscm->spec->pcm_capture_analog_channels;
337 if (tscm->spec->has_adat)
339 if (tscm->spec->has_spdif)
341 err = amdtp_tscm_init(&tscm->tx_stream, tscm->unit, AMDTP_IN_STREAM,
344 amdtp_stream_destroy(&tscm->rx_stream);
349 /* At bus reset, streaming is stopped and some registers are clear. */
350 void snd_tscm_stream_update_duplex(struct snd_tscm *tscm)
352 amdtp_stream_pcm_abort(&tscm->tx_stream);
353 amdtp_stream_stop(&tscm->tx_stream);
355 amdtp_stream_pcm_abort(&tscm->rx_stream);
356 amdtp_stream_stop(&tscm->rx_stream);
360 * This function should be called before starting streams or after stopping
363 void snd_tscm_stream_destroy_duplex(struct snd_tscm *tscm)
365 amdtp_stream_destroy(&tscm->rx_stream);
366 amdtp_stream_destroy(&tscm->tx_stream);
368 fw_iso_resources_destroy(&tscm->rx_resources);
369 fw_iso_resources_destroy(&tscm->tx_resources);
372 int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate)
374 unsigned int curr_rate;
377 if (tscm->substreams_counter == 0)
380 err = snd_tscm_stream_get_rate(tscm, &curr_rate);
383 if (curr_rate != rate ||
384 amdtp_streaming_error(&tscm->tx_stream) ||
385 amdtp_streaming_error(&tscm->rx_stream)) {
386 finish_session(tscm);
388 amdtp_stream_stop(&tscm->tx_stream);
389 amdtp_stream_stop(&tscm->rx_stream);
391 release_resources(tscm);
394 if (!amdtp_stream_running(&tscm->tx_stream)) {
395 amdtp_stream_set_sync(CIP_SYNC_TO_DEVICE,
396 &tscm->tx_stream, &tscm->rx_stream);
397 err = keep_resources(tscm, rate);
401 err = set_stream_formats(tscm, rate);
405 err = begin_session(tscm);
409 err = amdtp_stream_start(&tscm->tx_stream,
410 tscm->tx_resources.channel,
411 fw_parent_device(tscm->unit)->max_speed);
415 if (!amdtp_stream_wait_callback(&tscm->tx_stream,
422 if (!amdtp_stream_running(&tscm->rx_stream)) {
423 err = amdtp_stream_start(&tscm->rx_stream,
424 tscm->rx_resources.channel,
425 fw_parent_device(tscm->unit)->max_speed);
429 if (!amdtp_stream_wait_callback(&tscm->rx_stream,
438 amdtp_stream_stop(&tscm->tx_stream);
439 amdtp_stream_stop(&tscm->rx_stream);
441 finish_session(tscm);
442 release_resources(tscm);
447 void snd_tscm_stream_stop_duplex(struct snd_tscm *tscm)
449 if (tscm->substreams_counter > 0)
452 amdtp_stream_stop(&tscm->tx_stream);
453 amdtp_stream_stop(&tscm->rx_stream);
455 finish_session(tscm);
456 release_resources(tscm);
459 void snd_tscm_stream_lock_changed(struct snd_tscm *tscm)
461 tscm->dev_lock_changed = true;
462 wake_up(&tscm->hwdep_wait);
465 int snd_tscm_stream_lock_try(struct snd_tscm *tscm)
469 spin_lock_irq(&tscm->lock);
471 /* user land lock this */
472 if (tscm->dev_lock_count < 0) {
477 /* this is the first time */
478 if (tscm->dev_lock_count++ == 0)
479 snd_tscm_stream_lock_changed(tscm);
482 spin_unlock_irq(&tscm->lock);
486 void snd_tscm_stream_lock_release(struct snd_tscm *tscm)
488 spin_lock_irq(&tscm->lock);
490 if (WARN_ON(tscm->dev_lock_count <= 0))
492 if (--tscm->dev_lock_count == 0)
493 snd_tscm_stream_lock_changed(tscm);
495 spin_unlock_irq(&tscm->lock);