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 */ 39 enum cip_flags { 40 CIP_NONBLOCKING = 0x00, 41 CIP_BLOCKING = 0x01, 42 CIP_EMPTY_WITH_TAG0 = 0x02, 43 CIP_DBC_IS_END_EVENT = 0x04, 44 CIP_WRONG_DBS = 0x08, 45 CIP_SKIP_DBC_ZERO_CHECK = 0x10, 46 CIP_EMPTY_HAS_WRONG_DBC = 0x20, 47 CIP_JUMBO_PAYLOAD = 0x40, 48 CIP_HEADER_WITHOUT_EOH = 0x80, 49 CIP_NO_HEADER = 0x100, 50 CIP_UNALIGHED_DBC = 0x200, 51 }; 52 53 /** 54 * enum cip_sfc - supported Sampling Frequency Codes (SFCs) 55 * @CIP_SFC_32000: 32,000 data blocks 56 * @CIP_SFC_44100: 44,100 data blocks 57 * @CIP_SFC_48000: 48,000 data blocks 58 * @CIP_SFC_88200: 88,200 data blocks 59 * @CIP_SFC_96000: 96,000 data blocks 60 * @CIP_SFC_176400: 176,400 data blocks 61 * @CIP_SFC_192000: 192,000 data blocks 62 * @CIP_SFC_COUNT: the number of supported SFCs 63 * 64 * These values are used to show nominal Sampling Frequency Code in 65 * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002, 66 * this code means the number of events per second. Actually the code 67 * represents the number of data blocks transferred per second in an AMDTP 68 * stream. 69 * 70 * In IEC 61883-6:2005, some extensions were added to support more types of 71 * data such as 'One Bit LInear Audio', therefore the meaning of SFC became 72 * different depending on the types. 73 * 74 * Currently our implementation is compatible with IEC 61883-6:2002. 75 */ 76 enum cip_sfc { 77 CIP_SFC_32000 = 0, 78 CIP_SFC_44100 = 1, 79 CIP_SFC_48000 = 2, 80 CIP_SFC_88200 = 3, 81 CIP_SFC_96000 = 4, 82 CIP_SFC_176400 = 5, 83 CIP_SFC_192000 = 6, 84 CIP_SFC_COUNT 85 }; 86 87 struct fw_unit; 88 struct fw_iso_context; 89 struct snd_pcm_substream; 90 struct snd_pcm_runtime; 91 92 enum amdtp_stream_direction { 93 AMDTP_OUT_STREAM = 0, 94 AMDTP_IN_STREAM 95 }; 96 97 struct pkt_desc { 98 u32 cycle; 99 u32 syt; 100 unsigned int data_blocks; 101 unsigned int data_block_counter; 102 __be32 *ctx_payload; 103 }; 104 105 struct amdtp_stream; 106 typedef unsigned int (*amdtp_stream_process_ctx_payloads_t)( 107 struct amdtp_stream *s, 108 const struct pkt_desc *desc, 109 unsigned int packets, 110 struct snd_pcm_substream *pcm); 111 112 struct amdtp_domain; 113 struct amdtp_stream { 114 struct fw_unit *unit; 115 enum cip_flags flags; 116 enum amdtp_stream_direction direction; 117 struct mutex mutex; 118 119 /* For packet processing. */ 120 struct fw_iso_context *context; 121 struct iso_packets_buffer buffer; 122 unsigned int queue_size; 123 int packet_index; 124 struct pkt_desc *pkt_descs; 125 int tag; 126 union { 127 struct { 128 unsigned int ctx_header_size; 129 130 // limit for payload of iso packet. 131 unsigned int max_ctx_payload_length; 132 133 // For quirks of CIP headers. 134 // Fixed interval of dbc between previos/current 135 // packets. 136 unsigned int dbc_interval; 137 } tx; 138 struct { 139 // To calculate CIP data blocks and tstamp. 140 unsigned int transfer_delay; 141 unsigned int seq_index; 142 143 // To generate CIP header. 144 unsigned int fdf; 145 int syt_override; 146 147 // To generate constant hardware IRQ. 148 unsigned int event_count; 149 unsigned int events_per_period; 150 } rx; 151 } ctx_data; 152 153 /* For CIP headers. */ 154 unsigned int source_node_id_field; 155 unsigned int data_block_quadlets; 156 unsigned int data_block_counter; 157 unsigned int sph; 158 unsigned int fmt; 159 160 /* Internal flags. */ 161 enum cip_sfc sfc; 162 unsigned int syt_interval; 163 164 /* For a PCM substream processing. */ 165 struct snd_pcm_substream *pcm; 166 struct tasklet_struct period_tasklet; 167 snd_pcm_uframes_t pcm_buffer_pointer; 168 unsigned int pcm_period_pointer; 169 170 /* To wait for first packet. */ 171 bool callbacked; 172 wait_queue_head_t callback_wait; 173 u32 start_cycle; 174 175 /* For backends to process data blocks. */ 176 void *protocol; 177 amdtp_stream_process_ctx_payloads_t process_ctx_payloads; 178 179 // For domain. 180 int channel; 181 int speed; 182 struct list_head list; 183 struct amdtp_domain *domain; 184 }; 185 186 int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, 187 enum amdtp_stream_direction dir, enum cip_flags flags, 188 unsigned int fmt, 189 amdtp_stream_process_ctx_payloads_t process_ctx_payloads, 190 unsigned int protocol_size); 191 void amdtp_stream_destroy(struct amdtp_stream *s); 192 193 int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, 194 unsigned int data_block_quadlets); 195 unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s); 196 197 void amdtp_stream_update(struct amdtp_stream *s); 198 199 int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, 200 struct snd_pcm_runtime *runtime); 201 202 void amdtp_stream_pcm_prepare(struct amdtp_stream *s); 203 void amdtp_stream_pcm_abort(struct amdtp_stream *s); 204 205 extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT]; 206 extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT]; 207 208 /** 209 * amdtp_stream_running - check stream is running or not 210 * @s: the AMDTP stream 211 * 212 * If this function returns true, the stream is running. 213 */ 214 static inline bool amdtp_stream_running(struct amdtp_stream *s) 215 { 216 return !IS_ERR(s->context); 217 } 218 219 /** 220 * amdtp_streaming_error - check for streaming error 221 * @s: the AMDTP stream 222 * 223 * If this function returns true, the stream's packet queue has stopped due to 224 * an asynchronous error. 225 */ 226 static inline bool amdtp_streaming_error(struct amdtp_stream *s) 227 { 228 return s->packet_index < 0; 229 } 230 231 /** 232 * amdtp_stream_pcm_running - check PCM substream is running or not 233 * @s: the AMDTP stream 234 * 235 * If this function returns true, PCM substream in the AMDTP stream is running. 236 */ 237 static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s) 238 { 239 return !!s->pcm; 240 } 241 242 /** 243 * amdtp_stream_pcm_trigger - start/stop playback from a PCM device 244 * @s: the AMDTP stream 245 * @pcm: the PCM device to be started, or %NULL to stop the current device 246 * 247 * Call this function on a running isochronous stream to enable the actual 248 * transmission of PCM data. This function should be called from the PCM 249 * device's .trigger callback. 250 */ 251 static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s, 252 struct snd_pcm_substream *pcm) 253 { 254 WRITE_ONCE(s->pcm, pcm); 255 } 256 257 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) 258 { 259 return sfc & 1; 260 } 261 262 /** 263 * amdtp_stream_wait_callback - sleep till callbacked or timeout 264 * @s: the AMDTP stream 265 * @timeout: msec till timeout 266 * 267 * If this function return false, the AMDTP stream should be stopped. 268 */ 269 static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s, 270 unsigned int timeout) 271 { 272 return wait_event_timeout(s->callback_wait, 273 s->callbacked == true, 274 msecs_to_jiffies(timeout)) > 0; 275 } 276 277 struct seq_desc { 278 unsigned int syt_offset; 279 unsigned int data_blocks; 280 }; 281 282 struct amdtp_domain { 283 struct list_head streams; 284 285 unsigned int events_per_period; 286 unsigned int events_per_buffer; 287 288 struct amdtp_stream *irq_target; 289 290 struct seq_desc *seq_descs; 291 unsigned int seq_size; 292 unsigned int seq_tail; 293 294 unsigned int data_block_state; 295 unsigned int syt_offset_state; 296 unsigned int last_syt_offset; 297 }; 298 299 int amdtp_domain_init(struct amdtp_domain *d); 300 void amdtp_domain_destroy(struct amdtp_domain *d); 301 302 int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s, 303 int channel, int speed); 304 305 int amdtp_domain_start(struct amdtp_domain *d, unsigned int ir_delay_cycle); 306 void amdtp_domain_stop(struct amdtp_domain *d); 307 308 static inline int amdtp_domain_set_events_per_period(struct amdtp_domain *d, 309 unsigned int events_per_period, 310 unsigned int events_per_buffer) 311 { 312 d->events_per_period = events_per_period; 313 d->events_per_buffer = events_per_buffer; 314 315 return 0; 316 } 317 318 unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d, 319 struct amdtp_stream *s); 320 int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s); 321 322 #endif 323