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 * @CIP_DBC_IS_PAYLOAD_QUADLETS: Available for incoming packet, and only effective with 41 * CIP_DBC_IS_END_EVENT flag. The value of dbc field is the number of accumulated quadlets 42 * in CIP payload, instead of the number of accumulated data blocks. 43 */ 44 enum cip_flags { 45 CIP_NONBLOCKING = 0x00, 46 CIP_BLOCKING = 0x01, 47 CIP_EMPTY_WITH_TAG0 = 0x02, 48 CIP_DBC_IS_END_EVENT = 0x04, 49 CIP_WRONG_DBS = 0x08, 50 CIP_SKIP_DBC_ZERO_CHECK = 0x10, 51 CIP_EMPTY_HAS_WRONG_DBC = 0x20, 52 CIP_JUMBO_PAYLOAD = 0x40, 53 CIP_HEADER_WITHOUT_EOH = 0x80, 54 CIP_NO_HEADER = 0x100, 55 CIP_UNALIGHED_DBC = 0x200, 56 CIP_UNAWARE_SYT = 0x400, 57 CIP_DBC_IS_PAYLOAD_QUADLETS = 0x800, 58 }; 59 60 /** 61 * enum cip_sfc - supported Sampling Frequency Codes (SFCs) 62 * @CIP_SFC_32000: 32,000 data blocks 63 * @CIP_SFC_44100: 44,100 data blocks 64 * @CIP_SFC_48000: 48,000 data blocks 65 * @CIP_SFC_88200: 88,200 data blocks 66 * @CIP_SFC_96000: 96,000 data blocks 67 * @CIP_SFC_176400: 176,400 data blocks 68 * @CIP_SFC_192000: 192,000 data blocks 69 * @CIP_SFC_COUNT: the number of supported SFCs 70 * 71 * These values are used to show nominal Sampling Frequency Code in 72 * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002, 73 * this code means the number of events per second. Actually the code 74 * represents the number of data blocks transferred per second in an AMDTP 75 * stream. 76 * 77 * In IEC 61883-6:2005, some extensions were added to support more types of 78 * data such as 'One Bit LInear Audio', therefore the meaning of SFC became 79 * different depending on the types. 80 * 81 * Currently our implementation is compatible with IEC 61883-6:2002. 82 */ 83 enum cip_sfc { 84 CIP_SFC_32000 = 0, 85 CIP_SFC_44100 = 1, 86 CIP_SFC_48000 = 2, 87 CIP_SFC_88200 = 3, 88 CIP_SFC_96000 = 4, 89 CIP_SFC_176400 = 5, 90 CIP_SFC_192000 = 6, 91 CIP_SFC_COUNT 92 }; 93 94 struct fw_unit; 95 struct fw_iso_context; 96 struct snd_pcm_substream; 97 struct snd_pcm_runtime; 98 99 enum amdtp_stream_direction { 100 AMDTP_OUT_STREAM = 0, 101 AMDTP_IN_STREAM 102 }; 103 104 struct pkt_desc { 105 u32 cycle; 106 u32 syt; 107 unsigned int data_blocks; 108 unsigned int data_block_counter; 109 __be32 *ctx_payload; 110 struct list_head link; 111 }; 112 113 struct amdtp_stream; 114 typedef void (*amdtp_stream_process_ctx_payloads_t)(struct amdtp_stream *s, 115 const struct pkt_desc *desc, 116 unsigned int count, 117 struct snd_pcm_substream *pcm); 118 119 struct amdtp_domain; 120 struct amdtp_stream { 121 struct fw_unit *unit; 122 // The combination of cip_flags enumeration-constants. 123 unsigned int flags; 124 enum amdtp_stream_direction direction; 125 struct mutex mutex; 126 127 /* For packet processing. */ 128 struct fw_iso_context *context; 129 struct iso_packets_buffer buffer; 130 unsigned int queue_size; 131 int packet_index; 132 struct pkt_desc *packet_descs; 133 struct list_head packet_descs_list; 134 struct pkt_desc *packet_descs_cursor; 135 int tag; 136 union { 137 struct { 138 unsigned int ctx_header_size; 139 140 // limit for payload of iso packet. 141 unsigned int max_ctx_payload_length; 142 143 // For quirks of CIP headers. 144 // Fixed interval of dbc between previos/current 145 // packets. 146 unsigned int dbc_interval; 147 148 // The device starts multiplexing events to the packet. 149 bool event_starts; 150 151 struct { 152 struct seq_desc *descs; 153 unsigned int size; 154 unsigned int pos; 155 } cache; 156 } tx; 157 struct { 158 // To generate CIP header. 159 unsigned int fdf; 160 161 // To generate constant hardware IRQ. 162 unsigned int event_count; 163 164 // To calculate CIP data blocks and tstamp. 165 struct { 166 struct seq_desc *descs; 167 unsigned int size; 168 unsigned int pos; 169 } seq; 170 171 unsigned int data_block_state; 172 unsigned int syt_offset_state; 173 unsigned int last_syt_offset; 174 175 struct amdtp_stream *replay_target; 176 unsigned int cache_pos; 177 } rx; 178 } ctx_data; 179 180 /* For CIP headers. */ 181 unsigned int source_node_id_field; 182 unsigned int data_block_quadlets; 183 unsigned int data_block_counter; 184 unsigned int sph; 185 unsigned int fmt; 186 187 // Internal flags. 188 unsigned int transfer_delay; 189 enum cip_sfc sfc; 190 unsigned int syt_interval; 191 192 /* For a PCM substream processing. */ 193 struct snd_pcm_substream *pcm; 194 struct work_struct period_work; 195 snd_pcm_uframes_t pcm_buffer_pointer; 196 unsigned int pcm_period_pointer; 197 unsigned int pcm_frame_multiplier; 198 199 // To start processing content of packets at the same cycle in several contexts for 200 // each direction. 201 bool ready_processing; 202 wait_queue_head_t ready_wait; 203 unsigned int next_cycle; 204 205 /* For backends to process data blocks. */ 206 void *protocol; 207 amdtp_stream_process_ctx_payloads_t process_ctx_payloads; 208 209 // For domain. 210 int channel; 211 int speed; 212 struct list_head list; 213 struct amdtp_domain *domain; 214 }; 215 216 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, 217 enum amdtp_stream_direction dir, unsigned int flags, 218 unsigned int fmt, 219 amdtp_stream_process_ctx_payloads_t process_ctx_payloads, 220 unsigned int protocol_size); 221 void amdtp_stream_destroy(struct amdtp_stream *s); 222 223 int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, 224 unsigned int data_block_quadlets, unsigned int pcm_frame_multiplier); 225 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s); 226 227 void amdtp_stream_update(struct amdtp_stream *s); 228 229 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, 230 struct snd_pcm_runtime *runtime); 231 232 void amdtp_stream_pcm_prepare(struct amdtp_stream *s); 233 void amdtp_stream_pcm_abort(struct amdtp_stream *s); 234 235 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT]; 236 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT]; 237 238 /** 239 * amdtp_stream_running - check stream is running or not 240 * @s: the AMDTP stream 241 * 242 * If this function returns true, the stream is running. 243 */ amdtp_stream_running(struct amdtp_stream * s)244 static inline bool amdtp_stream_running(struct amdtp_stream *s) 245 { 246 return !IS_ERR(s->context); 247 } 248 249 /** 250 * amdtp_streaming_error - check for streaming error 251 * @s: the AMDTP stream 252 * 253 * If this function returns true, the stream's packet queue has stopped due to 254 * an asynchronous error. 255 */ amdtp_streaming_error(struct amdtp_stream * s)256 static inline bool amdtp_streaming_error(struct amdtp_stream *s) 257 { 258 return s->packet_index < 0; 259 } 260 261 /** 262 * amdtp_stream_pcm_running - check PCM substream is running or not 263 * @s: the AMDTP stream 264 * 265 * If this function returns true, PCM substream in the AMDTP stream is running. 266 */ amdtp_stream_pcm_running(struct amdtp_stream * s)267 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s) 268 { 269 return !!s->pcm; 270 } 271 272 /** 273 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device 274 * @s: the AMDTP stream 275 * @pcm: the PCM device to be started, or %NULL to stop the current device 276 * 277 * Call this function on a running isochronous stream to enable the actual 278 * transmission of PCM data. This function should be called from the PCM 279 * device's .trigger callback. 280 */ amdtp_stream_pcm_trigger(struct amdtp_stream * s,struct snd_pcm_substream * pcm)281 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s, 282 struct snd_pcm_substream *pcm) 283 { 284 WRITE_ONCE(s->pcm, pcm); 285 } 286 287 /** 288 * amdtp_stream_next_packet_desc - retrieve next descriptor for amdtp packet. 289 * @s: the AMDTP stream 290 * @desc: the descriptor of packet 291 * 292 * This macro computes next descriptor so that the list of descriptors behaves circular queue. 293 */ 294 #define amdtp_stream_next_packet_desc(s, desc) \ 295 list_next_entry_circular(desc, &s->packet_descs_list, link) 296 cip_sfc_is_base_44100(enum cip_sfc sfc)297 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) 298 { 299 return sfc & 1; 300 } 301 302 struct seq_desc { 303 unsigned int syt_offset; 304 unsigned int data_blocks; 305 }; 306 307 struct amdtp_domain { 308 struct list_head streams; 309 310 unsigned int events_per_period; 311 unsigned int events_per_buffer; 312 313 struct amdtp_stream *irq_target; 314 315 struct { 316 unsigned int tx_init_skip; 317 unsigned int tx_start; 318 unsigned int rx_start; 319 } processing_cycle; 320 321 struct { 322 bool enable:1; 323 bool on_the_fly:1; 324 } replay; 325 }; 326 327 int amdtp_domain_init(struct amdtp_domain *d); 328 void amdtp_domain_destroy(struct amdtp_domain *d); 329 330 int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s, 331 int channel, int speed); 332 333 int amdtp_domain_start(struct amdtp_domain *d, unsigned int tx_init_skip_cycles, bool replay_seq, 334 bool replay_on_the_fly); 335 void amdtp_domain_stop(struct amdtp_domain *d); 336 amdtp_domain_set_events_per_period(struct amdtp_domain * d,unsigned int events_per_period,unsigned int events_per_buffer)337 static inline int amdtp_domain_set_events_per_period(struct amdtp_domain *d, 338 unsigned int events_per_period, 339 unsigned int events_per_buffer) 340 { 341 d->events_per_period = events_per_period; 342 d->events_per_buffer = events_per_buffer; 343 344 return 0; 345 } 346 347 unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d, 348 struct amdtp_stream *s); 349 int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s); 350 351 /** 352 * amdtp_domain_wait_ready - sleep till being ready to process packets or timeout 353 * @d: the AMDTP domain 354 * @timeout_ms: msec till timeout 355 * 356 * If this function return false, the AMDTP domain should be stopped. 357 */ amdtp_domain_wait_ready(struct amdtp_domain * d,unsigned int timeout_ms)358 static inline bool amdtp_domain_wait_ready(struct amdtp_domain *d, unsigned int timeout_ms) 359 { 360 struct amdtp_stream *s; 361 362 list_for_each_entry(s, &d->streams, list) { 363 unsigned int j = msecs_to_jiffies(timeout_ms); 364 365 if (wait_event_interruptible_timeout(s->ready_wait, s->ready_processing, j) <= 0) 366 return false; 367 } 368 369 return true; 370 } 371 372 #endif 373