1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2d67c46b9STakashi Sakamoto #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED 3d67c46b9STakashi Sakamoto #define SOUND_FIREWIRE_AMDTP_H_INCLUDED 4d67c46b9STakashi Sakamoto 5d67c46b9STakashi Sakamoto #include <linux/err.h> 6d67c46b9STakashi Sakamoto #include <linux/interrupt.h> 7d67c46b9STakashi Sakamoto #include <linux/mutex.h> 85955815eSTakashi Sakamoto #include <linux/sched.h> 9d67c46b9STakashi Sakamoto #include <sound/asound.h> 10d67c46b9STakashi Sakamoto #include "packets-buffer.h" 11d67c46b9STakashi Sakamoto 12d67c46b9STakashi Sakamoto /** 13d67c46b9STakashi Sakamoto * enum cip_flags - describes details of the streaming protocol 14d67c46b9STakashi Sakamoto * @CIP_NONBLOCKING: In non-blocking mode, each packet contains 15d67c46b9STakashi Sakamoto * sample_rate/8000 samples, with rounding up or down to adjust 16d67c46b9STakashi Sakamoto * for clock skew and left-over fractional samples. This should 17d67c46b9STakashi Sakamoto * be used if supported by the device. 18d67c46b9STakashi Sakamoto * @CIP_BLOCKING: In blocking mode, each packet contains either zero or 19d67c46b9STakashi Sakamoto * SYT_INTERVAL samples, with these two types alternating so that 20d67c46b9STakashi Sakamoto * the overall sample rate comes out right. 21d67c46b9STakashi Sakamoto * @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0. 229dae017bSTakashi Sakamoto * @CIP_DBC_IS_END_EVENT: The value of dbc in an packet corresponds to the end 239dae017bSTakashi Sakamoto * of event in the packet. Out of IEC 61883. 24d67c46b9STakashi Sakamoto * @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets. 25d67c46b9STakashi Sakamoto * The value of data_block_quadlets is used instead of reported value. 26d67c46b9STakashi Sakamoto * @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is 27d67c46b9STakashi Sakamoto * skipped for detecting discontinuity. 28d67c46b9STakashi Sakamoto * @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty 29d67c46b9STakashi Sakamoto * packet is wrong but the others are correct. 30d67c46b9STakashi Sakamoto * @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an 31d67c46b9STakashi Sakamoto * packet is larger than IEC 61883-6 defines. Current implementation 32d67c46b9STakashi Sakamoto * allows 5 times as large as IEC 61883-6 defines. 332128f78fSTakashi Sakamoto * @CIP_HEADER_WITHOUT_EOH: Only for in-stream. CIP Header doesn't include 342128f78fSTakashi Sakamoto * valid EOH. 353b196c39STakashi Sakamoto * @CIP_NO_HEADERS: a lack of headers in packets 36588f2e2cSTakashi Sakamoto * @CIP_UNALIGHED_DBC: Only for in-stream. The value of dbc is not alighed to 37588f2e2cSTakashi Sakamoto * the value of current SYT_INTERVAL; e.g. initial value is not zero. 38d67c46b9STakashi Sakamoto */ 39d67c46b9STakashi Sakamoto enum cip_flags { 40d67c46b9STakashi Sakamoto CIP_NONBLOCKING = 0x00, 41d67c46b9STakashi Sakamoto CIP_BLOCKING = 0x01, 42dec63cc8STakashi Sakamoto CIP_EMPTY_WITH_TAG0 = 0x02, 43dec63cc8STakashi Sakamoto CIP_DBC_IS_END_EVENT = 0x04, 44dec63cc8STakashi Sakamoto CIP_WRONG_DBS = 0x08, 45dec63cc8STakashi Sakamoto CIP_SKIP_DBC_ZERO_CHECK = 0x10, 4662f00e40STakashi Sakamoto CIP_EMPTY_HAS_WRONG_DBC = 0x20, 4762f00e40STakashi Sakamoto CIP_JUMBO_PAYLOAD = 0x40, 482128f78fSTakashi Sakamoto CIP_HEADER_WITHOUT_EOH = 0x80, 493b196c39STakashi Sakamoto CIP_NO_HEADER = 0x100, 50588f2e2cSTakashi Sakamoto CIP_UNALIGHED_DBC = 0x200, 51d67c46b9STakashi Sakamoto }; 52d67c46b9STakashi Sakamoto 53d67c46b9STakashi Sakamoto /** 54d67c46b9STakashi Sakamoto * enum cip_sfc - supported Sampling Frequency Codes (SFCs) 55d67c46b9STakashi Sakamoto * @CIP_SFC_32000: 32,000 data blocks 56d67c46b9STakashi Sakamoto * @CIP_SFC_44100: 44,100 data blocks 57d67c46b9STakashi Sakamoto * @CIP_SFC_48000: 48,000 data blocks 58d67c46b9STakashi Sakamoto * @CIP_SFC_88200: 88,200 data blocks 59d67c46b9STakashi Sakamoto * @CIP_SFC_96000: 96,000 data blocks 60d67c46b9STakashi Sakamoto * @CIP_SFC_176400: 176,400 data blocks 61d67c46b9STakashi Sakamoto * @CIP_SFC_192000: 192,000 data blocks 62d67c46b9STakashi Sakamoto * @CIP_SFC_COUNT: the number of supported SFCs 63d67c46b9STakashi Sakamoto * 64d67c46b9STakashi Sakamoto * These values are used to show nominal Sampling Frequency Code in 65d67c46b9STakashi Sakamoto * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002, 66d67c46b9STakashi Sakamoto * this code means the number of events per second. Actually the code 67d67c46b9STakashi Sakamoto * represents the number of data blocks transferred per second in an AMDTP 68d67c46b9STakashi Sakamoto * stream. 69d67c46b9STakashi Sakamoto * 70d67c46b9STakashi Sakamoto * In IEC 61883-6:2005, some extensions were added to support more types of 71d67c46b9STakashi Sakamoto * data such as 'One Bit LInear Audio', therefore the meaning of SFC became 72d67c46b9STakashi Sakamoto * different depending on the types. 73d67c46b9STakashi Sakamoto * 74d67c46b9STakashi Sakamoto * Currently our implementation is compatible with IEC 61883-6:2002. 75d67c46b9STakashi Sakamoto */ 76d67c46b9STakashi Sakamoto enum cip_sfc { 77d67c46b9STakashi Sakamoto CIP_SFC_32000 = 0, 78d67c46b9STakashi Sakamoto CIP_SFC_44100 = 1, 79d67c46b9STakashi Sakamoto CIP_SFC_48000 = 2, 80d67c46b9STakashi Sakamoto CIP_SFC_88200 = 3, 81d67c46b9STakashi Sakamoto CIP_SFC_96000 = 4, 82d67c46b9STakashi Sakamoto CIP_SFC_176400 = 5, 83d67c46b9STakashi Sakamoto CIP_SFC_192000 = 6, 84d67c46b9STakashi Sakamoto CIP_SFC_COUNT 85d67c46b9STakashi Sakamoto }; 86d67c46b9STakashi Sakamoto 87d67c46b9STakashi Sakamoto struct fw_unit; 88d67c46b9STakashi Sakamoto struct fw_iso_context; 89d67c46b9STakashi Sakamoto struct snd_pcm_substream; 90d67c46b9STakashi Sakamoto struct snd_pcm_runtime; 91d67c46b9STakashi Sakamoto 92d67c46b9STakashi Sakamoto enum amdtp_stream_direction { 93d67c46b9STakashi Sakamoto AMDTP_OUT_STREAM = 0, 94d67c46b9STakashi Sakamoto AMDTP_IN_STREAM 95d67c46b9STakashi Sakamoto }; 96d67c46b9STakashi Sakamoto 9704130cf8STakashi Sakamoto struct pkt_desc { 9804130cf8STakashi Sakamoto u32 cycle; 9904130cf8STakashi Sakamoto u32 syt; 10004130cf8STakashi Sakamoto unsigned int data_blocks; 10104130cf8STakashi Sakamoto unsigned int data_block_counter; 10204130cf8STakashi Sakamoto __be32 *ctx_payload; 10304130cf8STakashi Sakamoto }; 10404130cf8STakashi Sakamoto 105df075feeSTakashi Sakamoto struct amdtp_stream; 1069a738ad1STakashi Sakamoto typedef unsigned int (*amdtp_stream_process_ctx_payloads_t)( 107df075feeSTakashi Sakamoto struct amdtp_stream *s, 108d2c104a3STakashi Sakamoto const struct pkt_desc *desc, 1099a738ad1STakashi Sakamoto unsigned int packets, 110d2c104a3STakashi Sakamoto struct snd_pcm_substream *pcm); 111d67c46b9STakashi Sakamoto struct amdtp_stream { 112d67c46b9STakashi Sakamoto struct fw_unit *unit; 113d67c46b9STakashi Sakamoto enum cip_flags flags; 114d67c46b9STakashi Sakamoto enum amdtp_stream_direction direction; 115d67c46b9STakashi Sakamoto struct mutex mutex; 116d67c46b9STakashi Sakamoto 117d67c46b9STakashi Sakamoto /* For packet processing. */ 118d67c46b9STakashi Sakamoto struct fw_iso_context *context; 119d67c46b9STakashi Sakamoto struct iso_packets_buffer buffer; 120d67c46b9STakashi Sakamoto int packet_index; 12104130cf8STakashi Sakamoto struct pkt_desc *pkt_descs; 1223b196c39STakashi Sakamoto int tag; 123d3d10a4aSTakashi Sakamoto union { 124d3d10a4aSTakashi Sakamoto struct { 125d3d10a4aSTakashi Sakamoto unsigned int ctx_header_size; 126d3d10a4aSTakashi Sakamoto 127d3d10a4aSTakashi Sakamoto // limit for payload of iso packet. 128f11453c7STakashi Sakamoto unsigned int max_ctx_payload_length; 129d67c46b9STakashi Sakamoto 130d3d10a4aSTakashi Sakamoto // For quirks of CIP headers. 131d3d10a4aSTakashi Sakamoto // Fixed interval of dbc between previos/current 132d3d10a4aSTakashi Sakamoto // packets. 133d3d10a4aSTakashi Sakamoto unsigned int dbc_interval; 134d3d10a4aSTakashi Sakamoto } tx; 135d3d10a4aSTakashi Sakamoto struct { 136d3d10a4aSTakashi Sakamoto // To calculate CIP data blocks and tstamp. 137d3d10a4aSTakashi Sakamoto unsigned int transfer_delay; 138d3d10a4aSTakashi Sakamoto unsigned int data_block_state; 139d3d10a4aSTakashi Sakamoto unsigned int last_syt_offset; 140d3d10a4aSTakashi Sakamoto unsigned int syt_offset_state; 141d3d10a4aSTakashi Sakamoto 142d3d10a4aSTakashi Sakamoto // To generate CIP header. 143d3d10a4aSTakashi Sakamoto unsigned int fdf; 1443baf3053STakashi Sakamoto int syt_override; 145d3d10a4aSTakashi Sakamoto } rx; 146d3d10a4aSTakashi Sakamoto } ctx_data; 147d3d10a4aSTakashi Sakamoto 148d67c46b9STakashi Sakamoto /* For CIP headers. */ 149d67c46b9STakashi Sakamoto unsigned int source_node_id_field; 150d67c46b9STakashi Sakamoto unsigned int data_block_quadlets; 151d67c46b9STakashi Sakamoto unsigned int data_block_counter; 1529863874fSTakashi Sakamoto unsigned int sph; 153d67c46b9STakashi Sakamoto unsigned int fmt; 154d67c46b9STakashi Sakamoto 155d67c46b9STakashi Sakamoto /* Internal flags. */ 156d67c46b9STakashi Sakamoto enum cip_sfc sfc; 157d67c46b9STakashi Sakamoto unsigned int syt_interval; 158d67c46b9STakashi Sakamoto 159d67c46b9STakashi Sakamoto /* For a PCM substream processing. */ 160d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm; 161d67c46b9STakashi Sakamoto struct tasklet_struct period_tasklet; 1624a9bfafcSTakashi Sakamoto snd_pcm_uframes_t pcm_buffer_pointer; 163d67c46b9STakashi Sakamoto unsigned int pcm_period_pointer; 164d67c46b9STakashi Sakamoto 165d67c46b9STakashi Sakamoto /* To wait for first packet. */ 166d67c46b9STakashi Sakamoto bool callbacked; 167d67c46b9STakashi Sakamoto wait_queue_head_t callback_wait; 168a04513f8STakashi Sakamoto u32 start_cycle; 169d67c46b9STakashi Sakamoto 170df075feeSTakashi Sakamoto /* For backends to process data blocks. */ 171df075feeSTakashi Sakamoto void *protocol; 1729a738ad1STakashi Sakamoto amdtp_stream_process_ctx_payloads_t process_ctx_payloads; 173d67c46b9STakashi Sakamoto }; 174d67c46b9STakashi Sakamoto 175d67c46b9STakashi Sakamoto int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, 176df075feeSTakashi Sakamoto enum amdtp_stream_direction dir, enum cip_flags flags, 177df075feeSTakashi Sakamoto unsigned int fmt, 1789a738ad1STakashi Sakamoto amdtp_stream_process_ctx_payloads_t process_ctx_payloads, 179df075feeSTakashi Sakamoto unsigned int protocol_size); 180d67c46b9STakashi Sakamoto void amdtp_stream_destroy(struct amdtp_stream *s); 181d67c46b9STakashi Sakamoto 182df075feeSTakashi Sakamoto int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, 183df075feeSTakashi Sakamoto unsigned int data_block_quadlets); 184d67c46b9STakashi Sakamoto unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s); 185d67c46b9STakashi Sakamoto 186d67c46b9STakashi Sakamoto int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed); 187d67c46b9STakashi Sakamoto void amdtp_stream_update(struct amdtp_stream *s); 188d67c46b9STakashi Sakamoto void amdtp_stream_stop(struct amdtp_stream *s); 189d67c46b9STakashi Sakamoto 190d67c46b9STakashi Sakamoto int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, 191d67c46b9STakashi Sakamoto struct snd_pcm_runtime *runtime); 192df075feeSTakashi Sakamoto 193d67c46b9STakashi Sakamoto void amdtp_stream_pcm_prepare(struct amdtp_stream *s); 194d67c46b9STakashi Sakamoto unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s); 195875becf8STakashi Sakamoto int amdtp_stream_pcm_ack(struct amdtp_stream *s); 196d67c46b9STakashi Sakamoto void amdtp_stream_pcm_abort(struct amdtp_stream *s); 197d67c46b9STakashi Sakamoto 198d67c46b9STakashi Sakamoto extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT]; 199d67c46b9STakashi Sakamoto extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT]; 200d67c46b9STakashi Sakamoto 201d67c46b9STakashi Sakamoto /** 202d67c46b9STakashi Sakamoto * amdtp_stream_running - check stream is running or not 203d67c46b9STakashi Sakamoto * @s: the AMDTP stream 204d67c46b9STakashi Sakamoto * 205d67c46b9STakashi Sakamoto * If this function returns true, the stream is running. 206d67c46b9STakashi Sakamoto */ 207d67c46b9STakashi Sakamoto static inline bool amdtp_stream_running(struct amdtp_stream *s) 208d67c46b9STakashi Sakamoto { 209d67c46b9STakashi Sakamoto return !IS_ERR(s->context); 210d67c46b9STakashi Sakamoto } 211d67c46b9STakashi Sakamoto 212d67c46b9STakashi Sakamoto /** 213d67c46b9STakashi Sakamoto * amdtp_streaming_error - check for streaming error 214d67c46b9STakashi Sakamoto * @s: the AMDTP stream 215d67c46b9STakashi Sakamoto * 216d67c46b9STakashi Sakamoto * If this function returns true, the stream's packet queue has stopped due to 217d67c46b9STakashi Sakamoto * an asynchronous error. 218d67c46b9STakashi Sakamoto */ 219d67c46b9STakashi Sakamoto static inline bool amdtp_streaming_error(struct amdtp_stream *s) 220d67c46b9STakashi Sakamoto { 221d67c46b9STakashi Sakamoto return s->packet_index < 0; 222d67c46b9STakashi Sakamoto } 223d67c46b9STakashi Sakamoto 224d67c46b9STakashi Sakamoto /** 225d67c46b9STakashi Sakamoto * amdtp_stream_pcm_running - check PCM substream is running or not 226d67c46b9STakashi Sakamoto * @s: the AMDTP stream 227d67c46b9STakashi Sakamoto * 228d67c46b9STakashi Sakamoto * If this function returns true, PCM substream in the AMDTP stream is running. 229d67c46b9STakashi Sakamoto */ 230d67c46b9STakashi Sakamoto static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s) 231d67c46b9STakashi Sakamoto { 232d67c46b9STakashi Sakamoto return !!s->pcm; 233d67c46b9STakashi Sakamoto } 234d67c46b9STakashi Sakamoto 235d67c46b9STakashi Sakamoto /** 236d67c46b9STakashi Sakamoto * amdtp_stream_pcm_trigger - start/stop playback from a PCM device 237d67c46b9STakashi Sakamoto * @s: the AMDTP stream 238d67c46b9STakashi Sakamoto * @pcm: the PCM device to be started, or %NULL to stop the current device 239d67c46b9STakashi Sakamoto * 240d67c46b9STakashi Sakamoto * Call this function on a running isochronous stream to enable the actual 241d67c46b9STakashi Sakamoto * transmission of PCM data. This function should be called from the PCM 242d67c46b9STakashi Sakamoto * device's .trigger callback. 243d67c46b9STakashi Sakamoto */ 244d67c46b9STakashi Sakamoto static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s, 245d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm) 246d67c46b9STakashi Sakamoto { 2476aa7de05SMark Rutland WRITE_ONCE(s->pcm, pcm); 248d67c46b9STakashi Sakamoto } 249d67c46b9STakashi Sakamoto 250d67c46b9STakashi Sakamoto static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) 251d67c46b9STakashi Sakamoto { 252d67c46b9STakashi Sakamoto return sfc & 1; 253d67c46b9STakashi Sakamoto } 254d67c46b9STakashi Sakamoto 255d67c46b9STakashi Sakamoto /** 256d67c46b9STakashi Sakamoto * amdtp_stream_wait_callback - sleep till callbacked or timeout 257d67c46b9STakashi Sakamoto * @s: the AMDTP stream 258d67c46b9STakashi Sakamoto * @timeout: msec till timeout 259d67c46b9STakashi Sakamoto * 260d67c46b9STakashi Sakamoto * If this function return false, the AMDTP stream should be stopped. 261d67c46b9STakashi Sakamoto */ 262d67c46b9STakashi Sakamoto static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s, 263d67c46b9STakashi Sakamoto unsigned int timeout) 264d67c46b9STakashi Sakamoto { 265d67c46b9STakashi Sakamoto return wait_event_timeout(s->callback_wait, 266d67c46b9STakashi Sakamoto s->callbacked == true, 267d67c46b9STakashi Sakamoto msecs_to_jiffies(timeout)) > 0; 268d67c46b9STakashi Sakamoto } 269d67c46b9STakashi Sakamoto 2703ec3d7a3STakashi Sakamoto struct amdtp_domain { 2713ec3d7a3STakashi Sakamoto struct list_head streams; 2723ec3d7a3STakashi Sakamoto }; 2733ec3d7a3STakashi Sakamoto 2743ec3d7a3STakashi Sakamoto int amdtp_domain_init(struct amdtp_domain *d); 2753ec3d7a3STakashi Sakamoto void amdtp_domain_destroy(struct amdtp_domain *d); 2763ec3d7a3STakashi Sakamoto 277d67c46b9STakashi Sakamoto #endif 278