1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
3 #define SOUND_FIREWIRE_AMDTP_H_INCLUDED
4
5 #include <linux/err.h>
6 #include <linux/interrupt.h>
7 #include <linux/mutex.h>
8 #include <linux/sched.h>
9 #include <sound/asound.h>
10 #include "packets-buffer.h"
11
12 /**
13 * enum cip_flags - describes details of the streaming protocol
14 * @CIP_NONBLOCKING: In non-blocking mode, each packet contains
15 * sample_rate/8000 samples, with rounding up or down to adjust
16 * for clock skew and left-over fractional samples. This should
17 * be used if supported by the device.
18 * @CIP_BLOCKING: In blocking mode, each packet contains either zero or
19 * SYT_INTERVAL samples, with these two types alternating so that
20 * the overall sample rate comes out right.
21 * @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0.
22 * @CIP_DBC_IS_END_EVENT: The value of dbc in an packet corresponds to the end
23 * of event in the packet. Out of IEC 61883.
24 * @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets.
25 * The value of data_block_quadlets is used instead of reported value.
26 * @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is
27 * skipped for detecting discontinuity.
28 * @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty
29 * packet is wrong but the others are correct.
30 * @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an
31 * packet is larger than IEC 61883-6 defines. Current implementation
32 * allows 5 times as large as IEC 61883-6 defines.
33 * @CIP_HEADER_WITHOUT_EOH: Only for in-stream. CIP Header doesn't include
34 * valid EOH.
35 * @CIP_NO_HEADERS: a lack of headers in packets
36 * @CIP_UNALIGHED_DBC: Only for in-stream. The value of dbc is not alighed to
37 * the value of current SYT_INTERVAL; e.g. initial value is not zero.
38 * @CIP_UNAWARE_SYT: For outgoing packet, the value in SYT field of CIP is 0xffff.
39 * For incoming packet, the value in SYT field of CIP is not handled.
40 */
41 enum cip_flags {
42 CIP_NONBLOCKING = 0x00,
43 CIP_BLOCKING = 0x01,
44 CIP_EMPTY_WITH_TAG0 = 0x02,
45 CIP_DBC_IS_END_EVENT = 0x04,
46 CIP_WRONG_DBS = 0x08,
47 CIP_SKIP_DBC_ZERO_CHECK = 0x10,
48 CIP_EMPTY_HAS_WRONG_DBC = 0x20,
49 CIP_JUMBO_PAYLOAD = 0x40,
50 CIP_HEADER_WITHOUT_EOH = 0x80,
51 CIP_NO_HEADER = 0x100,
52 CIP_UNALIGHED_DBC = 0x200,
53 CIP_UNAWARE_SYT = 0x400,
54 };
55
56 /**
57 * enum cip_sfc - supported Sampling Frequency Codes (SFCs)
58 * @CIP_SFC_32000: 32,000 data blocks
59 * @CIP_SFC_44100: 44,100 data blocks
60 * @CIP_SFC_48000: 48,000 data blocks
61 * @CIP_SFC_88200: 88,200 data blocks
62 * @CIP_SFC_96000: 96,000 data blocks
63 * @CIP_SFC_176400: 176,400 data blocks
64 * @CIP_SFC_192000: 192,000 data blocks
65 * @CIP_SFC_COUNT: the number of supported SFCs
66 *
67 * These values are used to show nominal Sampling Frequency Code in
68 * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002,
69 * this code means the number of events per second. Actually the code
70 * represents the number of data blocks transferred per second in an AMDTP
71 * stream.
72 *
73 * In IEC 61883-6:2005, some extensions were added to support more types of
74 * data such as 'One Bit LInear Audio', therefore the meaning of SFC became
75 * different depending on the types.
76 *
77 * Currently our implementation is compatible with IEC 61883-6:2002.
78 */
79 enum cip_sfc {
80 CIP_SFC_32000 = 0,
81 CIP_SFC_44100 = 1,
82 CIP_SFC_48000 = 2,
83 CIP_SFC_88200 = 3,
84 CIP_SFC_96000 = 4,
85 CIP_SFC_176400 = 5,
86 CIP_SFC_192000 = 6,
87 CIP_SFC_COUNT
88 };
89
90 struct fw_unit;
91 struct fw_iso_context;
92 struct snd_pcm_substream;
93 struct snd_pcm_runtime;
94
95 enum amdtp_stream_direction {
96 AMDTP_OUT_STREAM = 0,
97 AMDTP_IN_STREAM
98 };
99
100 struct pkt_desc {
101 u32 cycle;
102 u32 syt;
103 unsigned int data_blocks;
104 unsigned int data_block_counter;
105 __be32 *ctx_payload;
106 };
107
108 struct amdtp_stream;
109 typedef unsigned int (*amdtp_stream_process_ctx_payloads_t)(
110 struct amdtp_stream *s,
111 const struct pkt_desc *desc,
112 unsigned int packets,
113 struct snd_pcm_substream *pcm);
114
115 struct amdtp_domain;
116 struct amdtp_stream {
117 struct fw_unit *unit;
118 // The combination of cip_flags enumeration-constants.
119 unsigned int flags;
120 enum amdtp_stream_direction direction;
121 struct mutex mutex;
122
123 /* For packet processing. */
124 struct fw_iso_context *context;
125 struct iso_packets_buffer buffer;
126 unsigned int queue_size;
127 int packet_index;
128 struct pkt_desc *pkt_descs;
129 int tag;
130 union {
131 struct {
132 unsigned int ctx_header_size;
133
134 // limit for payload of iso packet.
135 unsigned int max_ctx_payload_length;
136
137 // For quirks of CIP headers.
138 // Fixed interval of dbc between previos/current
139 // packets.
140 unsigned int dbc_interval;
141
142 // The device starts multiplexing events to the packet.
143 bool event_starts;
144
145 struct {
146 struct seq_desc *descs;
147 unsigned int size;
148 unsigned int tail;
149 } cache;
150 } tx;
151 struct {
152 // To generate CIP header.
153 unsigned int fdf;
154
155 // To generate constant hardware IRQ.
156 unsigned int event_count;
157
158 // To calculate CIP data blocks and tstamp.
159 struct {
160 struct seq_desc *descs;
161 unsigned int size;
162 unsigned int tail;
163 unsigned int head;
164 } seq;
165
166 unsigned int data_block_state;
167 unsigned int syt_offset_state;
168 unsigned int last_syt_offset;
169
170 struct amdtp_stream *replay_target;
171 unsigned int cache_head;
172 } rx;
173 } ctx_data;
174
175 /* For CIP headers. */
176 unsigned int source_node_id_field;
177 unsigned int data_block_quadlets;
178 unsigned int data_block_counter;
179 unsigned int sph;
180 unsigned int fmt;
181
182 // Internal flags.
183 unsigned int transfer_delay;
184 enum cip_sfc sfc;
185 unsigned int syt_interval;
186
187 /* For a PCM substream processing. */
188 struct snd_pcm_substream *pcm;
189 snd_pcm_uframes_t pcm_buffer_pointer;
190 unsigned int pcm_period_pointer;
191
192 // To start processing content of packets at the same cycle in several contexts for
193 // each direction.
194 bool ready_processing;
195 wait_queue_head_t ready_wait;
196 unsigned int next_cycle;
197
198 /* For backends to process data blocks. */
199 void *protocol;
200 amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
201
202 // For domain.
203 int channel;
204 int speed;
205 struct list_head list;
206 struct amdtp_domain *domain;
207 };
208
209 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
210 enum amdtp_stream_direction dir, unsigned int flags,
211 unsigned int fmt,
212 amdtp_stream_process_ctx_payloads_t process_ctx_payloads,
213 unsigned int protocol_size);
214 void amdtp_stream_destroy(struct amdtp_stream *s);
215
216 int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate,
217 unsigned int data_block_quadlets);
218 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
219
220 void amdtp_stream_update(struct amdtp_stream *s);
221
222 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
223 struct snd_pcm_runtime *runtime);
224
225 void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
226 void amdtp_stream_pcm_abort(struct amdtp_stream *s);
227
228 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
229 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
230
231 /**
232 * amdtp_stream_running - check stream is running or not
233 * @s: the AMDTP stream
234 *
235 * If this function returns true, the stream is running.
236 */
amdtp_stream_running(struct amdtp_stream * s)237 static inline bool amdtp_stream_running(struct amdtp_stream *s)
238 {
239 return !IS_ERR(s->context);
240 }
241
242 /**
243 * amdtp_streaming_error - check for streaming error
244 * @s: the AMDTP stream
245 *
246 * If this function returns true, the stream's packet queue has stopped due to
247 * an asynchronous error.
248 */
amdtp_streaming_error(struct amdtp_stream * s)249 static inline bool amdtp_streaming_error(struct amdtp_stream *s)
250 {
251 return s->packet_index < 0;
252 }
253
254 /**
255 * amdtp_stream_pcm_running - check PCM substream is running or not
256 * @s: the AMDTP stream
257 *
258 * If this function returns true, PCM substream in the AMDTP stream is running.
259 */
amdtp_stream_pcm_running(struct amdtp_stream * s)260 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
261 {
262 return !!s->pcm;
263 }
264
265 /**
266 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device
267 * @s: the AMDTP stream
268 * @pcm: the PCM device to be started, or %NULL to stop the current device
269 *
270 * Call this function on a running isochronous stream to enable the actual
271 * transmission of PCM data. This function should be called from the PCM
272 * device's .trigger callback.
273 */
amdtp_stream_pcm_trigger(struct amdtp_stream * s,struct snd_pcm_substream * pcm)274 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
275 struct snd_pcm_substream *pcm)
276 {
277 WRITE_ONCE(s->pcm, pcm);
278 }
279
cip_sfc_is_base_44100(enum cip_sfc sfc)280 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
281 {
282 return sfc & 1;
283 }
284
285 struct seq_desc {
286 unsigned int syt_offset;
287 unsigned int data_blocks;
288 };
289
290 struct amdtp_domain {
291 struct list_head streams;
292
293 unsigned int events_per_period;
294 unsigned int events_per_buffer;
295
296 struct amdtp_stream *irq_target;
297
298 struct {
299 unsigned int tx_init_skip;
300 unsigned int tx_start;
301 unsigned int rx_start;
302 } processing_cycle;
303
304 struct {
305 bool enable:1;
306 bool on_the_fly:1;
307 } replay;
308 };
309
310 int amdtp_domain_init(struct amdtp_domain *d);
311 void amdtp_domain_destroy(struct amdtp_domain *d);
312
313 int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
314 int channel, int speed);
315
316 int amdtp_domain_start(struct amdtp_domain *d, unsigned int tx_init_skip_cycles, bool replay_seq,
317 bool replay_on_the_fly);
318 void amdtp_domain_stop(struct amdtp_domain *d);
319
amdtp_domain_set_events_per_period(struct amdtp_domain * d,unsigned int events_per_period,unsigned int events_per_buffer)320 static inline int amdtp_domain_set_events_per_period(struct amdtp_domain *d,
321 unsigned int events_per_period,
322 unsigned int events_per_buffer)
323 {
324 d->events_per_period = events_per_period;
325 d->events_per_buffer = events_per_buffer;
326
327 return 0;
328 }
329
330 unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d,
331 struct amdtp_stream *s);
332 int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s);
333
334 /**
335 * amdtp_domain_wait_ready - sleep till being ready to process packets or timeout
336 * @d: the AMDTP domain
337 * @timeout_ms: msec till timeout
338 *
339 * If this function return false, the AMDTP domain should be stopped.
340 */
amdtp_domain_wait_ready(struct amdtp_domain * d,unsigned int timeout_ms)341 static inline bool amdtp_domain_wait_ready(struct amdtp_domain *d, unsigned int timeout_ms)
342 {
343 struct amdtp_stream *s;
344
345 list_for_each_entry(s, &d->streams, list) {
346 unsigned int j = msecs_to_jiffies(timeout_ms);
347
348 if (wait_event_interruptible_timeout(s->ready_wait, s->ready_processing, j) <= 0)
349 return false;
350 }
351
352 return true;
353 }
354
355 #endif
356