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 struct work_struct period_work; 190 snd_pcm_uframes_t pcm_buffer_pointer; 191 unsigned int pcm_period_pointer; 192 193 // To start processing content of packets at the same cycle in several contexts for 194 // each direction. 195 bool ready_processing; 196 wait_queue_head_t ready_wait; 197 unsigned int next_cycle; 198 199 /* For backends to process data blocks. */ 200 void *protocol; 201 amdtp_stream_process_ctx_payloads_t process_ctx_payloads; 202 203 // For domain. 204 int channel; 205 int speed; 206 struct list_head list; 207 struct amdtp_domain *domain; 208 }; 209 210 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, 211 enum amdtp_stream_direction dir, unsigned int flags, 212 unsigned int fmt, 213 amdtp_stream_process_ctx_payloads_t process_ctx_payloads, 214 unsigned int protocol_size); 215 void amdtp_stream_destroy(struct amdtp_stream *s); 216 217 int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, 218 unsigned int data_block_quadlets); 219 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s); 220 221 void amdtp_stream_update(struct amdtp_stream *s); 222 223 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, 224 struct snd_pcm_runtime *runtime); 225 226 void amdtp_stream_pcm_prepare(struct amdtp_stream *s); 227 void amdtp_stream_pcm_abort(struct amdtp_stream *s); 228 229 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT]; 230 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT]; 231 232 /** 233 * amdtp_stream_running - check stream is running or not 234 * @s: the AMDTP stream 235 * 236 * If this function returns true, the stream is running. 237 */ 238 static inline bool amdtp_stream_running(struct amdtp_stream *s) 239 { 240 return !IS_ERR(s->context); 241 } 242 243 /** 244 * amdtp_streaming_error - check for streaming error 245 * @s: the AMDTP stream 246 * 247 * If this function returns true, the stream's packet queue has stopped due to 248 * an asynchronous error. 249 */ 250 static inline bool amdtp_streaming_error(struct amdtp_stream *s) 251 { 252 return s->packet_index < 0; 253 } 254 255 /** 256 * amdtp_stream_pcm_running - check PCM substream is running or not 257 * @s: the AMDTP stream 258 * 259 * If this function returns true, PCM substream in the AMDTP stream is running. 260 */ 261 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s) 262 { 263 return !!s->pcm; 264 } 265 266 /** 267 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device 268 * @s: the AMDTP stream 269 * @pcm: the PCM device to be started, or %NULL to stop the current device 270 * 271 * Call this function on a running isochronous stream to enable the actual 272 * transmission of PCM data. This function should be called from the PCM 273 * device's .trigger callback. 274 */ 275 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s, 276 struct snd_pcm_substream *pcm) 277 { 278 WRITE_ONCE(s->pcm, pcm); 279 } 280 281 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) 282 { 283 return sfc & 1; 284 } 285 286 struct seq_desc { 287 unsigned int syt_offset; 288 unsigned int data_blocks; 289 }; 290 291 struct amdtp_domain { 292 struct list_head streams; 293 294 unsigned int events_per_period; 295 unsigned int events_per_buffer; 296 297 struct amdtp_stream *irq_target; 298 299 struct { 300 unsigned int tx_init_skip; 301 unsigned int tx_start; 302 unsigned int rx_start; 303 } processing_cycle; 304 305 struct { 306 bool enable:1; 307 bool on_the_fly:1; 308 } replay; 309 }; 310 311 int amdtp_domain_init(struct amdtp_domain *d); 312 void amdtp_domain_destroy(struct amdtp_domain *d); 313 314 int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s, 315 int channel, int speed); 316 317 int amdtp_domain_start(struct amdtp_domain *d, unsigned int tx_init_skip_cycles, bool replay_seq, 318 bool replay_on_the_fly); 319 void amdtp_domain_stop(struct amdtp_domain *d); 320 321 static inline int amdtp_domain_set_events_per_period(struct amdtp_domain *d, 322 unsigned int events_per_period, 323 unsigned int events_per_buffer) 324 { 325 d->events_per_period = events_per_period; 326 d->events_per_buffer = events_per_buffer; 327 328 return 0; 329 } 330 331 unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d, 332 struct amdtp_stream *s); 333 int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s); 334 335 /** 336 * amdtp_domain_wait_ready - sleep till being ready to process packets or timeout 337 * @d: the AMDTP domain 338 * @timeout_ms: msec till timeout 339 * 340 * If this function return false, the AMDTP domain should be stopped. 341 */ 342 static inline bool amdtp_domain_wait_ready(struct amdtp_domain *d, unsigned int timeout_ms) 343 { 344 struct amdtp_stream *s; 345 346 list_for_each_entry(s, &d->streams, list) { 347 unsigned int j = msecs_to_jiffies(timeout_ms); 348 349 if (wait_event_interruptible_timeout(s->ready_wait, s->ready_processing, j) <= 0) 350 return false; 351 } 352 353 return true; 354 } 355 356 #endif 357