1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ff-stream.c - a part of driver for RME Fireface series
4 *
5 * Copyright (c) 2015-2017 Takashi Sakamoto
6 */
7
8 #include "ff.h"
9
10 #define READY_TIMEOUT_MS 200
11
12 int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
13 enum snd_ff_stream_mode *mode)
14 {
15 static const enum snd_ff_stream_mode modes[] = {
16 [CIP_SFC_32000] = SND_FF_STREAM_MODE_LOW,
17 [CIP_SFC_44100] = SND_FF_STREAM_MODE_LOW,
18 [CIP_SFC_48000] = SND_FF_STREAM_MODE_LOW,
19 [CIP_SFC_88200] = SND_FF_STREAM_MODE_MID,
20 [CIP_SFC_96000] = SND_FF_STREAM_MODE_MID,
21 [CIP_SFC_176400] = SND_FF_STREAM_MODE_HIGH,
22 [CIP_SFC_192000] = SND_FF_STREAM_MODE_HIGH,
23 };
24
25 if (sfc >= CIP_SFC_COUNT)
26 return -EINVAL;
27
28 *mode = modes[sfc];
29
30 return 0;
31 }
32
33 static inline void finish_session(struct snd_ff *ff)
34 {
35 ff->spec->protocol->finish_session(ff);
36 ff->spec->protocol->switch_fetching_mode(ff, false);
37 }
38
39 static int init_stream(struct snd_ff *ff, struct amdtp_stream *s)
40 {
41 struct fw_iso_resources *resources;
42 enum amdtp_stream_direction dir;
43 int err;
44
45 if (s == &ff->tx_stream) {
46 resources = &ff->tx_resources;
47 dir = AMDTP_IN_STREAM;
48 } else {
49 resources = &ff->rx_resources;
50 dir = AMDTP_OUT_STREAM;
51 }
52
53 err = fw_iso_resources_init(resources, ff->unit);
54 if (err < 0)
55 return err;
56
57 err = amdtp_ff_init(s, ff->unit, dir);
58 if (err < 0)
59 fw_iso_resources_destroy(resources);
60
61 return err;
62 }
63
64 static void destroy_stream(struct snd_ff *ff, struct amdtp_stream *s)
65 {
66 amdtp_stream_destroy(s);
67
68 if (s == &ff->tx_stream)
69 fw_iso_resources_destroy(&ff->tx_resources);
70 else
71 fw_iso_resources_destroy(&ff->rx_resources);
72 }
73
74 int snd_ff_stream_init_duplex(struct snd_ff *ff)
75 {
76 int err;
77
78 err = init_stream(ff, &ff->rx_stream);
79 if (err < 0)
80 return err;
81
82 err = init_stream(ff, &ff->tx_stream);
83 if (err < 0) {
84 destroy_stream(ff, &ff->rx_stream);
85 return err;
86 }
87
88 err = amdtp_domain_init(&ff->domain);
89 if (err < 0) {
90 destroy_stream(ff, &ff->rx_stream);
91 destroy_stream(ff, &ff->tx_stream);
92 }
93
94 return err;
95 }
96
97 /*
98 * This function should be called before starting streams or after stopping
99 * streams.
100 */
101 void snd_ff_stream_destroy_duplex(struct snd_ff *ff)
102 {
103 amdtp_domain_destroy(&ff->domain);
104
105 destroy_stream(ff, &ff->rx_stream);
106 destroy_stream(ff, &ff->tx_stream);
107 }
108
109 int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
110 unsigned int frames_per_period,
111 unsigned int frames_per_buffer)
112 {
113 unsigned int curr_rate;
114 enum snd_ff_clock_src src;
115 int err;
116
117 err = ff->spec->protocol->get_clock(ff, &curr_rate, &src);
118 if (err < 0)
119 return err;
120
121 if (ff->substreams_counter == 0 || curr_rate != rate) {
122 enum snd_ff_stream_mode mode;
123 int i;
124
125 amdtp_domain_stop(&ff->domain);
126 finish_session(ff);
127
128 fw_iso_resources_free(&ff->tx_resources);
129 fw_iso_resources_free(&ff->rx_resources);
130
131 for (i = 0; i < CIP_SFC_COUNT; ++i) {
132 if (amdtp_rate_table[i] == rate)
133 break;
134 }
135 if (i >= CIP_SFC_COUNT)
136 return -EINVAL;
137
138 err = snd_ff_stream_get_multiplier_mode(i, &mode);
139 if (err < 0)
140 return err;
141
142 err = amdtp_ff_set_parameters(&ff->tx_stream, rate,
143 ff->spec->pcm_capture_channels[mode]);
144 if (err < 0)
145 return err;
146
147 err = amdtp_ff_set_parameters(&ff->rx_stream, rate,
148 ff->spec->pcm_playback_channels[mode]);
149 if (err < 0)
150 return err;
151
152 err = ff->spec->protocol->allocate_resources(ff, rate);
153 if (err < 0)
154 return err;
155
156 err = amdtp_domain_set_events_per_period(&ff->domain,
157 frames_per_period, frames_per_buffer);
158 if (err < 0) {
159 fw_iso_resources_free(&ff->tx_resources);
160 fw_iso_resources_free(&ff->rx_resources);
161 return err;
162 }
163 }
164
165 return 0;
166 }
167
168 int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
169 {
170 int err;
171
172 if (ff->substreams_counter == 0)
173 return 0;
174
175 if (amdtp_streaming_error(&ff->tx_stream) ||
176 amdtp_streaming_error(&ff->rx_stream)) {
177 amdtp_domain_stop(&ff->domain);
178 finish_session(ff);
179 }
180
181 /*
182 * Regardless of current source of clock signal, drivers transfer some
183 * packets. Then, the device transfers packets.
184 */
185 if (!amdtp_stream_running(&ff->rx_stream)) {
186 int spd = fw_parent_device(ff->unit)->max_speed;
187
188 err = ff->spec->protocol->begin_session(ff, rate);
189 if (err < 0)
190 goto error;
191
192 err = amdtp_domain_add_stream(&ff->domain, &ff->rx_stream,
193 ff->rx_resources.channel, spd);
194 if (err < 0)
195 goto error;
196
197 err = amdtp_domain_add_stream(&ff->domain, &ff->tx_stream,
198 ff->tx_resources.channel, spd);
199 if (err < 0)
200 goto error;
201
202 // NOTE: The device doesn't transfer packets unless receiving any packet. The
203 // sequence of tx packets includes cycle skip corresponding to empty packet or
204 // NODATA packet in IEC 61883-1/6. The sequence of the number of data blocks per
205 // packet is important for media clock recovery.
206 err = amdtp_domain_start(&ff->domain, 0, true, true);
207 if (err < 0)
208 goto error;
209
210 if (!amdtp_domain_wait_ready(&ff->domain, READY_TIMEOUT_MS)) {
211 err = -ETIMEDOUT;
212 goto error;
213 }
214
215 err = ff->spec->protocol->switch_fetching_mode(ff, true);
216 if (err < 0)
217 goto error;
218 }
219
220 return 0;
221 error:
222 amdtp_domain_stop(&ff->domain);
223 finish_session(ff);
224
225 return err;
226 }
227
228 void snd_ff_stream_stop_duplex(struct snd_ff *ff)
229 {
230 if (ff->substreams_counter == 0) {
231 amdtp_domain_stop(&ff->domain);
232 finish_session(ff);
233
234 fw_iso_resources_free(&ff->tx_resources);
235 fw_iso_resources_free(&ff->rx_resources);
236 }
237 }
238
239 void snd_ff_stream_update_duplex(struct snd_ff *ff)
240 {
241 amdtp_domain_stop(&ff->domain);
242
243 // The device discontinue to transfer packets.
244 amdtp_stream_pcm_abort(&ff->tx_stream);
245 amdtp_stream_pcm_abort(&ff->rx_stream);
246 }
247
248 void snd_ff_stream_lock_changed(struct snd_ff *ff)
249 {
250 ff->dev_lock_changed = true;
251 wake_up(&ff->hwdep_wait);
252 }
253
254 int snd_ff_stream_lock_try(struct snd_ff *ff)
255 {
256 int err;
257
258 spin_lock_irq(&ff->lock);
259
260 /* user land lock this */
261 if (ff->dev_lock_count < 0) {
262 err = -EBUSY;
263 goto end;
264 }
265
266 /* this is the first time */
267 if (ff->dev_lock_count++ == 0)
268 snd_ff_stream_lock_changed(ff);
269 err = 0;
270 end:
271 spin_unlock_irq(&ff->lock);
272 return err;
273 }
274
275 void snd_ff_stream_lock_release(struct snd_ff *ff)
276 {
277 spin_lock_irq(&ff->lock);
278
279 if (WARN_ON(ff->dev_lock_count <= 0))
280 goto end;
281 if (--ff->dev_lock_count == 0)
282 snd_ff_stream_lock_changed(ff);
283 end:
284 spin_unlock_irq(&ff->lock);
285 }
286
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