1d67c46b9STakashi Sakamoto /* 2d67c46b9STakashi Sakamoto * Audio and Music Data Transmission Protocol (IEC 61883-6) streams 3d67c46b9STakashi Sakamoto * with Common Isochronous Packet (IEC 61883-1) headers 4d67c46b9STakashi Sakamoto * 5d67c46b9STakashi Sakamoto * Copyright (c) Clemens Ladisch <clemens@ladisch.de> 6d67c46b9STakashi Sakamoto * Licensed under the terms of the GNU General Public License, version 2. 7d67c46b9STakashi Sakamoto */ 8d67c46b9STakashi Sakamoto 9d67c46b9STakashi Sakamoto #include <linux/device.h> 10d67c46b9STakashi Sakamoto #include <linux/err.h> 11d67c46b9STakashi Sakamoto #include <linux/firewire.h> 12d67c46b9STakashi Sakamoto #include <linux/module.h> 13d67c46b9STakashi Sakamoto #include <linux/slab.h> 14d67c46b9STakashi Sakamoto #include <sound/pcm.h> 15d67c46b9STakashi Sakamoto #include <sound/pcm_params.h> 16d67c46b9STakashi Sakamoto #include "amdtp-stream.h" 17d67c46b9STakashi Sakamoto 18d67c46b9STakashi Sakamoto #define TICKS_PER_CYCLE 3072 19d67c46b9STakashi Sakamoto #define CYCLES_PER_SECOND 8000 20d67c46b9STakashi Sakamoto #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) 21d67c46b9STakashi Sakamoto 220c95c1d6STakashi Sakamoto /* Always support Linux tracing subsystem. */ 230c95c1d6STakashi Sakamoto #define CREATE_TRACE_POINTS 240c95c1d6STakashi Sakamoto #include "amdtp-stream-trace.h" 250c95c1d6STakashi Sakamoto 26d67c46b9STakashi Sakamoto #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 microseconds */ 27d67c46b9STakashi Sakamoto 28d67c46b9STakashi Sakamoto /* isochronous header parameters */ 29d67c46b9STakashi Sakamoto #define ISO_DATA_LENGTH_SHIFT 16 303b196c39STakashi Sakamoto #define TAG_NO_CIP_HEADER 0 31d67c46b9STakashi Sakamoto #define TAG_CIP 1 32d67c46b9STakashi Sakamoto 33d67c46b9STakashi Sakamoto /* common isochronous packet header parameters */ 34d67c46b9STakashi Sakamoto #define CIP_EOH_SHIFT 31 35d67c46b9STakashi Sakamoto #define CIP_EOH (1u << CIP_EOH_SHIFT) 36d67c46b9STakashi Sakamoto #define CIP_EOH_MASK 0x80000000 37d67c46b9STakashi Sakamoto #define CIP_SID_SHIFT 24 38d67c46b9STakashi Sakamoto #define CIP_SID_MASK 0x3f000000 39d67c46b9STakashi Sakamoto #define CIP_DBS_MASK 0x00ff0000 40d67c46b9STakashi Sakamoto #define CIP_DBS_SHIFT 16 419863874fSTakashi Sakamoto #define CIP_SPH_MASK 0x00000400 429863874fSTakashi Sakamoto #define CIP_SPH_SHIFT 10 43d67c46b9STakashi Sakamoto #define CIP_DBC_MASK 0x000000ff 44d67c46b9STakashi Sakamoto #define CIP_FMT_SHIFT 24 45d67c46b9STakashi Sakamoto #define CIP_FMT_MASK 0x3f000000 46d67c46b9STakashi Sakamoto #define CIP_FDF_MASK 0x00ff0000 47d67c46b9STakashi Sakamoto #define CIP_FDF_SHIFT 16 48d67c46b9STakashi Sakamoto #define CIP_SYT_MASK 0x0000ffff 49d67c46b9STakashi Sakamoto #define CIP_SYT_NO_INFO 0xffff 50d67c46b9STakashi Sakamoto 5151c29fd2STakashi Sakamoto /* Audio and Music transfer protocol specific parameters */ 52d67c46b9STakashi Sakamoto #define CIP_FMT_AM 0x10 53d67c46b9STakashi Sakamoto #define AMDTP_FDF_NO_DATA 0xff 54d67c46b9STakashi Sakamoto 55d67c46b9STakashi Sakamoto /* TODO: make these configurable */ 56d67c46b9STakashi Sakamoto #define INTERRUPT_INTERVAL 16 57d67c46b9STakashi Sakamoto #define QUEUE_LENGTH 48 58d67c46b9STakashi Sakamoto 59f11453c7STakashi Sakamoto // For iso header, tstamp and 2 CIP header. 60f11453c7STakashi Sakamoto #define IR_CTX_HEADER_SIZE_CIP 16 61f11453c7STakashi Sakamoto // For iso header and tstamp. 62f11453c7STakashi Sakamoto #define IR_CTX_HEADER_SIZE_NO_CIP 8 63cc4f8e91STakashi Sakamoto #define HEADER_TSTAMP_MASK 0x0000ffff 64d67c46b9STakashi Sakamoto 65*b18f0cfaSTakashi Sakamoto #define IT_PKT_HEADER_SIZE_CIP 8 // For 2 CIP header. 66*b18f0cfaSTakashi Sakamoto #define IT_PKT_HEADER_SIZE_NO_CIP 0 // Nothing. 67*b18f0cfaSTakashi Sakamoto 68d67c46b9STakashi Sakamoto static void pcm_period_tasklet(unsigned long data); 69d67c46b9STakashi Sakamoto 70d67c46b9STakashi Sakamoto /** 71d67c46b9STakashi Sakamoto * amdtp_stream_init - initialize an AMDTP stream structure 72d67c46b9STakashi Sakamoto * @s: the AMDTP stream to initialize 73d67c46b9STakashi Sakamoto * @unit: the target of the stream 74d67c46b9STakashi Sakamoto * @dir: the direction of stream 75d67c46b9STakashi Sakamoto * @flags: the packet transmission method to use 765955815eSTakashi Sakamoto * @fmt: the value of fmt field in CIP header 77df075feeSTakashi Sakamoto * @process_data_blocks: callback handler to process data blocks 78df075feeSTakashi Sakamoto * @protocol_size: the size to allocate newly for protocol 79d67c46b9STakashi Sakamoto */ 80d67c46b9STakashi Sakamoto int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, 815955815eSTakashi Sakamoto enum amdtp_stream_direction dir, enum cip_flags flags, 82df075feeSTakashi Sakamoto unsigned int fmt, 83df075feeSTakashi Sakamoto amdtp_stream_process_data_blocks_t process_data_blocks, 84df075feeSTakashi Sakamoto unsigned int protocol_size) 85d67c46b9STakashi Sakamoto { 86df075feeSTakashi Sakamoto if (process_data_blocks == NULL) 87df075feeSTakashi Sakamoto return -EINVAL; 88df075feeSTakashi Sakamoto 89df075feeSTakashi Sakamoto s->protocol = kzalloc(protocol_size, GFP_KERNEL); 90df075feeSTakashi Sakamoto if (!s->protocol) 91df075feeSTakashi Sakamoto return -ENOMEM; 92df075feeSTakashi Sakamoto 93d67c46b9STakashi Sakamoto s->unit = unit; 94d67c46b9STakashi Sakamoto s->direction = dir; 95d67c46b9STakashi Sakamoto s->flags = flags; 96d67c46b9STakashi Sakamoto s->context = ERR_PTR(-1); 97d67c46b9STakashi Sakamoto mutex_init(&s->mutex); 98d67c46b9STakashi Sakamoto tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); 99d67c46b9STakashi Sakamoto s->packet_index = 0; 100d67c46b9STakashi Sakamoto 101d67c46b9STakashi Sakamoto init_waitqueue_head(&s->callback_wait); 102d67c46b9STakashi Sakamoto s->callbacked = false; 103d67c46b9STakashi Sakamoto 1045955815eSTakashi Sakamoto s->fmt = fmt; 105df075feeSTakashi Sakamoto s->process_data_blocks = process_data_blocks; 106d67c46b9STakashi Sakamoto 107d67c46b9STakashi Sakamoto return 0; 108d67c46b9STakashi Sakamoto } 109d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_init); 110d67c46b9STakashi Sakamoto 111d67c46b9STakashi Sakamoto /** 112d67c46b9STakashi Sakamoto * amdtp_stream_destroy - free stream resources 113d67c46b9STakashi Sakamoto * @s: the AMDTP stream to destroy 114d67c46b9STakashi Sakamoto */ 115d67c46b9STakashi Sakamoto void amdtp_stream_destroy(struct amdtp_stream *s) 116d67c46b9STakashi Sakamoto { 11744c376b9STakashi Sakamoto /* Not initialized. */ 11844c376b9STakashi Sakamoto if (s->protocol == NULL) 11944c376b9STakashi Sakamoto return; 12044c376b9STakashi Sakamoto 121d67c46b9STakashi Sakamoto WARN_ON(amdtp_stream_running(s)); 122df075feeSTakashi Sakamoto kfree(s->protocol); 123d67c46b9STakashi Sakamoto mutex_destroy(&s->mutex); 124d67c46b9STakashi Sakamoto } 125d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_destroy); 126d67c46b9STakashi Sakamoto 127d67c46b9STakashi Sakamoto const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { 128d67c46b9STakashi Sakamoto [CIP_SFC_32000] = 8, 129d67c46b9STakashi Sakamoto [CIP_SFC_44100] = 8, 130d67c46b9STakashi Sakamoto [CIP_SFC_48000] = 8, 131d67c46b9STakashi Sakamoto [CIP_SFC_88200] = 16, 132d67c46b9STakashi Sakamoto [CIP_SFC_96000] = 16, 133d67c46b9STakashi Sakamoto [CIP_SFC_176400] = 32, 134d67c46b9STakashi Sakamoto [CIP_SFC_192000] = 32, 135d67c46b9STakashi Sakamoto }; 136d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_syt_intervals); 137d67c46b9STakashi Sakamoto 138d67c46b9STakashi Sakamoto const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = { 139d67c46b9STakashi Sakamoto [CIP_SFC_32000] = 32000, 140d67c46b9STakashi Sakamoto [CIP_SFC_44100] = 44100, 141d67c46b9STakashi Sakamoto [CIP_SFC_48000] = 48000, 142d67c46b9STakashi Sakamoto [CIP_SFC_88200] = 88200, 143d67c46b9STakashi Sakamoto [CIP_SFC_96000] = 96000, 144d67c46b9STakashi Sakamoto [CIP_SFC_176400] = 176400, 145d67c46b9STakashi Sakamoto [CIP_SFC_192000] = 192000, 146d67c46b9STakashi Sakamoto }; 147d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_rate_table); 148d67c46b9STakashi Sakamoto 14959502295STakashi Sakamoto static int apply_constraint_to_size(struct snd_pcm_hw_params *params, 15059502295STakashi Sakamoto struct snd_pcm_hw_rule *rule) 15159502295STakashi Sakamoto { 15259502295STakashi Sakamoto struct snd_interval *s = hw_param_interval(params, rule->var); 15359502295STakashi Sakamoto const struct snd_interval *r = 15459502295STakashi Sakamoto hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 155826b5de9STakashi Sakamoto struct snd_interval t = {0}; 156826b5de9STakashi Sakamoto unsigned int step = 0; 15759502295STakashi Sakamoto int i; 15859502295STakashi Sakamoto 15959502295STakashi Sakamoto for (i = 0; i < CIP_SFC_COUNT; ++i) { 160826b5de9STakashi Sakamoto if (snd_interval_test(r, amdtp_rate_table[i])) 161826b5de9STakashi Sakamoto step = max(step, amdtp_syt_intervals[i]); 16259502295STakashi Sakamoto } 16359502295STakashi Sakamoto 164826b5de9STakashi Sakamoto t.min = roundup(s->min, step); 165826b5de9STakashi Sakamoto t.max = rounddown(s->max, step); 166826b5de9STakashi Sakamoto t.integer = 1; 16759502295STakashi Sakamoto 16859502295STakashi Sakamoto return snd_interval_refine(s, &t); 16959502295STakashi Sakamoto } 17059502295STakashi Sakamoto 171d67c46b9STakashi Sakamoto /** 172d67c46b9STakashi Sakamoto * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream 173d67c46b9STakashi Sakamoto * @s: the AMDTP stream, which must be initialized. 174d67c46b9STakashi Sakamoto * @runtime: the PCM substream runtime 175d67c46b9STakashi Sakamoto */ 176d67c46b9STakashi Sakamoto int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, 177d67c46b9STakashi Sakamoto struct snd_pcm_runtime *runtime) 178d67c46b9STakashi Sakamoto { 17955799c5aSTakashi Sakamoto struct snd_pcm_hardware *hw = &runtime->hw; 180d67c46b9STakashi Sakamoto int err; 181d67c46b9STakashi Sakamoto 18255799c5aSTakashi Sakamoto hw->info = SNDRV_PCM_INFO_BATCH | 18355799c5aSTakashi Sakamoto SNDRV_PCM_INFO_BLOCK_TRANSFER | 18455799c5aSTakashi Sakamoto SNDRV_PCM_INFO_INTERLEAVED | 18555799c5aSTakashi Sakamoto SNDRV_PCM_INFO_JOINT_DUPLEX | 18655799c5aSTakashi Sakamoto SNDRV_PCM_INFO_MMAP | 18755799c5aSTakashi Sakamoto SNDRV_PCM_INFO_MMAP_VALID; 18855799c5aSTakashi Sakamoto 18955799c5aSTakashi Sakamoto /* SNDRV_PCM_INFO_BATCH */ 19055799c5aSTakashi Sakamoto hw->periods_min = 2; 19155799c5aSTakashi Sakamoto hw->periods_max = UINT_MAX; 19255799c5aSTakashi Sakamoto 19355799c5aSTakashi Sakamoto /* bytes for a frame */ 19455799c5aSTakashi Sakamoto hw->period_bytes_min = 4 * hw->channels_max; 19555799c5aSTakashi Sakamoto 19655799c5aSTakashi Sakamoto /* Just to prevent from allocating much pages. */ 19755799c5aSTakashi Sakamoto hw->period_bytes_max = hw->period_bytes_min * 2048; 19855799c5aSTakashi Sakamoto hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; 19955799c5aSTakashi Sakamoto 200d67c46b9STakashi Sakamoto /* 201d67c46b9STakashi Sakamoto * Currently firewire-lib processes 16 packets in one software 202d67c46b9STakashi Sakamoto * interrupt callback. This equals to 2msec but actually the 203d67c46b9STakashi Sakamoto * interval of the interrupts has a jitter. 204d67c46b9STakashi Sakamoto * Additionally, even if adding a constraint to fit period size to 205d67c46b9STakashi Sakamoto * 2msec, actual calculated frames per period doesn't equal to 2msec, 206d67c46b9STakashi Sakamoto * depending on sampling rate. 207d67c46b9STakashi Sakamoto * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec. 208d67c46b9STakashi Sakamoto * Here let us use 5msec for safe period interrupt. 209d67c46b9STakashi Sakamoto */ 210d67c46b9STakashi Sakamoto err = snd_pcm_hw_constraint_minmax(runtime, 211d67c46b9STakashi Sakamoto SNDRV_PCM_HW_PARAM_PERIOD_TIME, 212d67c46b9STakashi Sakamoto 5000, UINT_MAX); 213d67c46b9STakashi Sakamoto if (err < 0) 214d67c46b9STakashi Sakamoto goto end; 215d67c46b9STakashi Sakamoto 216d67c46b9STakashi Sakamoto /* Non-Blocking stream has no more constraints */ 217d67c46b9STakashi Sakamoto if (!(s->flags & CIP_BLOCKING)) 218d67c46b9STakashi Sakamoto goto end; 219d67c46b9STakashi Sakamoto 220d67c46b9STakashi Sakamoto /* 221d67c46b9STakashi Sakamoto * One AMDTP packet can include some frames. In blocking mode, the 222d67c46b9STakashi Sakamoto * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, 223d67c46b9STakashi Sakamoto * depending on its sampling rate. For accurate period interrupt, it's 224d67c46b9STakashi Sakamoto * preferrable to align period/buffer sizes to current SYT_INTERVAL. 225d67c46b9STakashi Sakamoto */ 22659502295STakashi Sakamoto err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 22759502295STakashi Sakamoto apply_constraint_to_size, NULL, 228826b5de9STakashi Sakamoto SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 22959502295STakashi Sakamoto SNDRV_PCM_HW_PARAM_RATE, -1); 230d67c46b9STakashi Sakamoto if (err < 0) 231d67c46b9STakashi Sakamoto goto end; 23259502295STakashi Sakamoto err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 23359502295STakashi Sakamoto apply_constraint_to_size, NULL, 234826b5de9STakashi Sakamoto SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 23559502295STakashi Sakamoto SNDRV_PCM_HW_PARAM_RATE, -1); 23659502295STakashi Sakamoto if (err < 0) 23759502295STakashi Sakamoto goto end; 238d67c46b9STakashi Sakamoto end: 239d67c46b9STakashi Sakamoto return err; 240d67c46b9STakashi Sakamoto } 241d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); 242d67c46b9STakashi Sakamoto 243d67c46b9STakashi Sakamoto /** 244d67c46b9STakashi Sakamoto * amdtp_stream_set_parameters - set stream parameters 245d67c46b9STakashi Sakamoto * @s: the AMDTP stream to configure 246d67c46b9STakashi Sakamoto * @rate: the sample rate 247df075feeSTakashi Sakamoto * @data_block_quadlets: the size of a data block in quadlet unit 248d67c46b9STakashi Sakamoto * 249d67c46b9STakashi Sakamoto * The parameters must be set before the stream is started, and must not be 250d67c46b9STakashi Sakamoto * changed while the stream is running. 251d67c46b9STakashi Sakamoto */ 252df075feeSTakashi Sakamoto int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, 253df075feeSTakashi Sakamoto unsigned int data_block_quadlets) 254d67c46b9STakashi Sakamoto { 255df075feeSTakashi Sakamoto unsigned int sfc; 256d67c46b9STakashi Sakamoto 257d67c46b9STakashi Sakamoto for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) { 258d67c46b9STakashi Sakamoto if (amdtp_rate_table[sfc] == rate) 259d67c46b9STakashi Sakamoto break; 260d67c46b9STakashi Sakamoto } 261d67c46b9STakashi Sakamoto if (sfc == ARRAY_SIZE(amdtp_rate_table)) 262d67c46b9STakashi Sakamoto return -EINVAL; 263d67c46b9STakashi Sakamoto 264d67c46b9STakashi Sakamoto s->sfc = sfc; 265df075feeSTakashi Sakamoto s->data_block_quadlets = data_block_quadlets; 266d67c46b9STakashi Sakamoto s->syt_interval = amdtp_syt_intervals[sfc]; 267d67c46b9STakashi Sakamoto 268d3d10a4aSTakashi Sakamoto // default buffering in the device. 269d3d10a4aSTakashi Sakamoto if (s->direction == AMDTP_OUT_STREAM) { 270d3d10a4aSTakashi Sakamoto s->ctx_data.rx.transfer_delay = 271d3d10a4aSTakashi Sakamoto TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; 272d3d10a4aSTakashi Sakamoto 273d3d10a4aSTakashi Sakamoto if (s->flags & CIP_BLOCKING) { 274d3d10a4aSTakashi Sakamoto // additional buffering needed to adjust for no-data 275d3d10a4aSTakashi Sakamoto // packets. 276d3d10a4aSTakashi Sakamoto s->ctx_data.rx.transfer_delay += 277d3d10a4aSTakashi Sakamoto TICKS_PER_SECOND * s->syt_interval / rate; 278d3d10a4aSTakashi Sakamoto } 279d3d10a4aSTakashi Sakamoto } 280d67c46b9STakashi Sakamoto 281d67c46b9STakashi Sakamoto return 0; 282d67c46b9STakashi Sakamoto } 283d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_set_parameters); 284d67c46b9STakashi Sakamoto 285d67c46b9STakashi Sakamoto /** 286d67c46b9STakashi Sakamoto * amdtp_stream_get_max_payload - get the stream's packet size 287d67c46b9STakashi Sakamoto * @s: the AMDTP stream 288d67c46b9STakashi Sakamoto * 289d67c46b9STakashi Sakamoto * This function must not be called before the stream has been configured 290d67c46b9STakashi Sakamoto * with amdtp_stream_set_parameters(). 291d67c46b9STakashi Sakamoto */ 292d67c46b9STakashi Sakamoto unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) 293d67c46b9STakashi Sakamoto { 294d67c46b9STakashi Sakamoto unsigned int multiplier = 1; 29507ea238cSTakashi Sakamoto unsigned int cip_header_size = 0; 296d67c46b9STakashi Sakamoto 297d67c46b9STakashi Sakamoto if (s->flags & CIP_JUMBO_PAYLOAD) 298d67c46b9STakashi Sakamoto multiplier = 5; 2993b196c39STakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) 30007ea238cSTakashi Sakamoto cip_header_size = sizeof(__be32) * 2; 301d67c46b9STakashi Sakamoto 30207ea238cSTakashi Sakamoto return cip_header_size + 30307ea238cSTakashi Sakamoto s->syt_interval * s->data_block_quadlets * sizeof(__be32) * multiplier; 304d67c46b9STakashi Sakamoto } 305d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_get_max_payload); 306d67c46b9STakashi Sakamoto 307d67c46b9STakashi Sakamoto /** 308d67c46b9STakashi Sakamoto * amdtp_stream_pcm_prepare - prepare PCM device for running 309d67c46b9STakashi Sakamoto * @s: the AMDTP stream 310d67c46b9STakashi Sakamoto * 311d67c46b9STakashi Sakamoto * This function should be called from the PCM device's .prepare callback. 312d67c46b9STakashi Sakamoto */ 313d67c46b9STakashi Sakamoto void amdtp_stream_pcm_prepare(struct amdtp_stream *s) 314d67c46b9STakashi Sakamoto { 315d67c46b9STakashi Sakamoto tasklet_kill(&s->period_tasklet); 316d67c46b9STakashi Sakamoto s->pcm_buffer_pointer = 0; 317d67c46b9STakashi Sakamoto s->pcm_period_pointer = 0; 318d67c46b9STakashi Sakamoto } 319d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_pcm_prepare); 320d67c46b9STakashi Sakamoto 321d67c46b9STakashi Sakamoto static unsigned int calculate_data_blocks(struct amdtp_stream *s, 322d67c46b9STakashi Sakamoto unsigned int syt) 323d67c46b9STakashi Sakamoto { 324d67c46b9STakashi Sakamoto unsigned int phase, data_blocks; 325d67c46b9STakashi Sakamoto 326d67c46b9STakashi Sakamoto /* Blocking mode. */ 327d67c46b9STakashi Sakamoto if (s->flags & CIP_BLOCKING) { 328d67c46b9STakashi Sakamoto /* This module generate empty packet for 'no data'. */ 329d67c46b9STakashi Sakamoto if (syt == CIP_SYT_NO_INFO) 330d67c46b9STakashi Sakamoto data_blocks = 0; 331d67c46b9STakashi Sakamoto else 332d67c46b9STakashi Sakamoto data_blocks = s->syt_interval; 333d67c46b9STakashi Sakamoto /* Non-blocking mode. */ 334d67c46b9STakashi Sakamoto } else { 335d67c46b9STakashi Sakamoto if (!cip_sfc_is_base_44100(s->sfc)) { 336d3d10a4aSTakashi Sakamoto // Sample_rate / 8000 is an integer, and precomputed. 337d3d10a4aSTakashi Sakamoto data_blocks = s->ctx_data.rx.data_block_state; 338d67c46b9STakashi Sakamoto } else { 339d3d10a4aSTakashi Sakamoto phase = s->ctx_data.rx.data_block_state; 340d67c46b9STakashi Sakamoto 341d67c46b9STakashi Sakamoto /* 342d67c46b9STakashi Sakamoto * This calculates the number of data blocks per packet so that 343d67c46b9STakashi Sakamoto * 1) the overall rate is correct and exactly synchronized to 344d67c46b9STakashi Sakamoto * the bus clock, and 345d67c46b9STakashi Sakamoto * 2) packets with a rounded-up number of blocks occur as early 346d67c46b9STakashi Sakamoto * as possible in the sequence (to prevent underruns of the 347d67c46b9STakashi Sakamoto * device's buffer). 348d67c46b9STakashi Sakamoto */ 349d67c46b9STakashi Sakamoto if (s->sfc == CIP_SFC_44100) 350d67c46b9STakashi Sakamoto /* 6 6 5 6 5 6 5 ... */ 351d67c46b9STakashi Sakamoto data_blocks = 5 + ((phase & 1) ^ 352d67c46b9STakashi Sakamoto (phase == 0 || phase >= 40)); 353d67c46b9STakashi Sakamoto else 354d67c46b9STakashi Sakamoto /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ 355d67c46b9STakashi Sakamoto data_blocks = 11 * (s->sfc >> 1) + (phase == 0); 356d67c46b9STakashi Sakamoto if (++phase >= (80 >> (s->sfc >> 1))) 357d67c46b9STakashi Sakamoto phase = 0; 358d3d10a4aSTakashi Sakamoto s->ctx_data.rx.data_block_state = phase; 359d67c46b9STakashi Sakamoto } 360d67c46b9STakashi Sakamoto } 361d67c46b9STakashi Sakamoto 362d67c46b9STakashi Sakamoto return data_blocks; 363d67c46b9STakashi Sakamoto } 364d67c46b9STakashi Sakamoto 365d67c46b9STakashi Sakamoto static unsigned int calculate_syt(struct amdtp_stream *s, 366d67c46b9STakashi Sakamoto unsigned int cycle) 367d67c46b9STakashi Sakamoto { 368d67c46b9STakashi Sakamoto unsigned int syt_offset, phase, index, syt; 369d67c46b9STakashi Sakamoto 370d3d10a4aSTakashi Sakamoto if (s->ctx_data.rx.last_syt_offset < TICKS_PER_CYCLE) { 371d67c46b9STakashi Sakamoto if (!cip_sfc_is_base_44100(s->sfc)) 372d3d10a4aSTakashi Sakamoto syt_offset = s->ctx_data.rx.last_syt_offset + 373d3d10a4aSTakashi Sakamoto s->ctx_data.rx.syt_offset_state; 374d67c46b9STakashi Sakamoto else { 375d67c46b9STakashi Sakamoto /* 376d67c46b9STakashi Sakamoto * The time, in ticks, of the n'th SYT_INTERVAL sample is: 377d67c46b9STakashi Sakamoto * n * SYT_INTERVAL * 24576000 / sample_rate 378d67c46b9STakashi Sakamoto * Modulo TICKS_PER_CYCLE, the difference between successive 379d67c46b9STakashi Sakamoto * elements is about 1386.23. Rounding the results of this 380d67c46b9STakashi Sakamoto * formula to the SYT precision results in a sequence of 381d67c46b9STakashi Sakamoto * differences that begins with: 382d67c46b9STakashi Sakamoto * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... 383d67c46b9STakashi Sakamoto * This code generates _exactly_ the same sequence. 384d67c46b9STakashi Sakamoto */ 385d3d10a4aSTakashi Sakamoto phase = s->ctx_data.rx.syt_offset_state; 386d67c46b9STakashi Sakamoto index = phase % 13; 387d3d10a4aSTakashi Sakamoto syt_offset = s->ctx_data.rx.last_syt_offset; 388d67c46b9STakashi Sakamoto syt_offset += 1386 + ((index && !(index & 3)) || 389d67c46b9STakashi Sakamoto phase == 146); 390d67c46b9STakashi Sakamoto if (++phase >= 147) 391d67c46b9STakashi Sakamoto phase = 0; 392d3d10a4aSTakashi Sakamoto s->ctx_data.rx.syt_offset_state = phase; 393d67c46b9STakashi Sakamoto } 394d67c46b9STakashi Sakamoto } else 395d3d10a4aSTakashi Sakamoto syt_offset = s->ctx_data.rx.last_syt_offset - TICKS_PER_CYCLE; 396d3d10a4aSTakashi Sakamoto s->ctx_data.rx.last_syt_offset = syt_offset; 397d67c46b9STakashi Sakamoto 398d67c46b9STakashi Sakamoto if (syt_offset < TICKS_PER_CYCLE) { 399d3d10a4aSTakashi Sakamoto syt_offset += s->ctx_data.rx.transfer_delay; 400d67c46b9STakashi Sakamoto syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; 401d67c46b9STakashi Sakamoto syt += syt_offset % TICKS_PER_CYCLE; 402d67c46b9STakashi Sakamoto 403d67c46b9STakashi Sakamoto return syt & CIP_SYT_MASK; 404d67c46b9STakashi Sakamoto } else { 405d67c46b9STakashi Sakamoto return CIP_SYT_NO_INFO; 406d67c46b9STakashi Sakamoto } 407d67c46b9STakashi Sakamoto } 408d67c46b9STakashi Sakamoto 409d67c46b9STakashi Sakamoto static void update_pcm_pointers(struct amdtp_stream *s, 410d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm, 411d67c46b9STakashi Sakamoto unsigned int frames) 412d67c46b9STakashi Sakamoto { 413d67c46b9STakashi Sakamoto unsigned int ptr; 414d67c46b9STakashi Sakamoto 415d67c46b9STakashi Sakamoto ptr = s->pcm_buffer_pointer + frames; 416d67c46b9STakashi Sakamoto if (ptr >= pcm->runtime->buffer_size) 417d67c46b9STakashi Sakamoto ptr -= pcm->runtime->buffer_size; 4186aa7de05SMark Rutland WRITE_ONCE(s->pcm_buffer_pointer, ptr); 419d67c46b9STakashi Sakamoto 420d67c46b9STakashi Sakamoto s->pcm_period_pointer += frames; 421d67c46b9STakashi Sakamoto if (s->pcm_period_pointer >= pcm->runtime->period_size) { 422d67c46b9STakashi Sakamoto s->pcm_period_pointer -= pcm->runtime->period_size; 423d67c46b9STakashi Sakamoto tasklet_hi_schedule(&s->period_tasklet); 424d67c46b9STakashi Sakamoto } 425d67c46b9STakashi Sakamoto } 426d67c46b9STakashi Sakamoto 427d67c46b9STakashi Sakamoto static void pcm_period_tasklet(unsigned long data) 428d67c46b9STakashi Sakamoto { 429d67c46b9STakashi Sakamoto struct amdtp_stream *s = (void *)data; 4306aa7de05SMark Rutland struct snd_pcm_substream *pcm = READ_ONCE(s->pcm); 431d67c46b9STakashi Sakamoto 432d67c46b9STakashi Sakamoto if (pcm) 433d67c46b9STakashi Sakamoto snd_pcm_period_elapsed(pcm); 434d67c46b9STakashi Sakamoto } 435d67c46b9STakashi Sakamoto 4366007bf54STakashi Sakamoto static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params) 437d67c46b9STakashi Sakamoto { 4386007bf54STakashi Sakamoto int err; 439d67c46b9STakashi Sakamoto 4406007bf54STakashi Sakamoto params->interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); 4416007bf54STakashi Sakamoto params->tag = s->tag; 4426007bf54STakashi Sakamoto params->sy = 0; 443d67c46b9STakashi Sakamoto 4446007bf54STakashi Sakamoto err = fw_iso_context_queue(s->context, params, &s->buffer.iso_buffer, 445d67c46b9STakashi Sakamoto s->buffer.packets[s->packet_index].offset); 446d67c46b9STakashi Sakamoto if (err < 0) { 447d67c46b9STakashi Sakamoto dev_err(&s->unit->device, "queueing error: %d\n", err); 448d67c46b9STakashi Sakamoto goto end; 449d67c46b9STakashi Sakamoto } 450d67c46b9STakashi Sakamoto 451d67c46b9STakashi Sakamoto if (++s->packet_index >= QUEUE_LENGTH) 452d67c46b9STakashi Sakamoto s->packet_index = 0; 453d67c46b9STakashi Sakamoto end: 454d67c46b9STakashi Sakamoto return err; 455d67c46b9STakashi Sakamoto } 456d67c46b9STakashi Sakamoto 457d67c46b9STakashi Sakamoto static inline int queue_out_packet(struct amdtp_stream *s, 458*b18f0cfaSTakashi Sakamoto struct fw_iso_packet *params) 459d67c46b9STakashi Sakamoto { 460*b18f0cfaSTakashi Sakamoto params->skip = 461*b18f0cfaSTakashi Sakamoto !!(params->header_length == 0 && params->payload_length == 0); 4626007bf54STakashi Sakamoto return queue_packet(s, params); 463d67c46b9STakashi Sakamoto } 464d67c46b9STakashi Sakamoto 4656007bf54STakashi Sakamoto static inline int queue_in_packet(struct amdtp_stream *s, 4666007bf54STakashi Sakamoto struct fw_iso_packet *params) 467d67c46b9STakashi Sakamoto { 4686007bf54STakashi Sakamoto // Queue one packet for IR context. 4696007bf54STakashi Sakamoto params->header_length = s->ctx_data.tx.ctx_header_size; 4706007bf54STakashi Sakamoto params->payload_length = s->ctx_data.tx.max_ctx_payload_length; 4716007bf54STakashi Sakamoto params->skip = false; 4726007bf54STakashi Sakamoto return queue_packet(s, params); 473d67c46b9STakashi Sakamoto } 474d67c46b9STakashi Sakamoto 475252219c7STakashi Sakamoto static void generate_cip_header(struct amdtp_stream *s, __be32 cip_header[2], 476252219c7STakashi Sakamoto unsigned int syt) 477252219c7STakashi Sakamoto { 478252219c7STakashi Sakamoto cip_header[0] = cpu_to_be32(READ_ONCE(s->source_node_id_field) | 479252219c7STakashi Sakamoto (s->data_block_quadlets << CIP_DBS_SHIFT) | 480252219c7STakashi Sakamoto ((s->sph << CIP_SPH_SHIFT) & CIP_SPH_MASK) | 481252219c7STakashi Sakamoto s->data_block_counter); 482252219c7STakashi Sakamoto cip_header[1] = cpu_to_be32(CIP_EOH | 483252219c7STakashi Sakamoto ((s->fmt << CIP_FMT_SHIFT) & CIP_FMT_MASK) | 484252219c7STakashi Sakamoto ((s->ctx_data.rx.fdf << CIP_FDF_SHIFT) & CIP_FDF_MASK) | 485252219c7STakashi Sakamoto (syt & CIP_SYT_MASK)); 486252219c7STakashi Sakamoto } 487252219c7STakashi Sakamoto 4886f3c07d0STakashi Sakamoto static int handle_out_packet(struct amdtp_stream *s, unsigned int cycle, 4898a400b99STakashi Sakamoto const __be32 *ctx_header, __be32 *buffer, 4908a400b99STakashi Sakamoto unsigned int index) 491d67c46b9STakashi Sakamoto { 492390a1512STakashi Sakamoto unsigned int syt; 493390a1512STakashi Sakamoto unsigned int data_blocks; 49416be4589STakashi Sakamoto __be32 *cip_header; 49516be4589STakashi Sakamoto unsigned int pcm_frames; 496d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm; 497*b18f0cfaSTakashi Sakamoto struct { 498*b18f0cfaSTakashi Sakamoto struct fw_iso_packet params; 499*b18f0cfaSTakashi Sakamoto __be32 header[IT_PKT_HEADER_SIZE_CIP / sizeof(__be32)]; 500*b18f0cfaSTakashi Sakamoto } template = { {0}, {0} }; 501d67c46b9STakashi Sakamoto 502390a1512STakashi Sakamoto syt = calculate_syt(s, cycle); 503390a1512STakashi Sakamoto data_blocks = calculate_data_blocks(s, syt); 50416be4589STakashi Sakamoto pcm_frames = s->process_data_blocks(s, buffer, data_blocks, &syt); 505d67c46b9STakashi Sakamoto 5069dae017bSTakashi Sakamoto if (s->flags & CIP_DBC_IS_END_EVENT) 5079dae017bSTakashi Sakamoto s->data_block_counter = 5089dae017bSTakashi Sakamoto (s->data_block_counter + data_blocks) & 0xff; 5099dae017bSTakashi Sakamoto 510*b18f0cfaSTakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) { 511*b18f0cfaSTakashi Sakamoto cip_header = (__be32 *)template.params.header; 51216be4589STakashi Sakamoto generate_cip_header(s, cip_header, syt); 513*b18f0cfaSTakashi Sakamoto template.params.header_length = 2 * sizeof(__be32); 514*b18f0cfaSTakashi Sakamoto } else { 515*b18f0cfaSTakashi Sakamoto cip_header = NULL; 516*b18f0cfaSTakashi Sakamoto } 517d67c46b9STakashi Sakamoto 5189dae017bSTakashi Sakamoto if (!(s->flags & CIP_DBC_IS_END_EVENT)) 5199dae017bSTakashi Sakamoto s->data_block_counter = 5209dae017bSTakashi Sakamoto (s->data_block_counter + data_blocks) & 0xff; 5210c95c1d6STakashi Sakamoto 522*b18f0cfaSTakashi Sakamoto template.params.payload_length = 523*b18f0cfaSTakashi Sakamoto data_blocks * sizeof(__be32) * s->data_block_quadlets; 5240c95c1d6STakashi Sakamoto 525*b18f0cfaSTakashi Sakamoto trace_amdtp_packet(s, cycle, cip_header, template.params.payload_length, 526*b18f0cfaSTakashi Sakamoto data_blocks, index); 527*b18f0cfaSTakashi Sakamoto 528*b18f0cfaSTakashi Sakamoto if (queue_out_packet(s, &template.params) < 0) 529d67c46b9STakashi Sakamoto return -EIO; 530d67c46b9STakashi Sakamoto 5316aa7de05SMark Rutland pcm = READ_ONCE(s->pcm); 532d67c46b9STakashi Sakamoto if (pcm && pcm_frames > 0) 533d67c46b9STakashi Sakamoto update_pcm_pointers(s, pcm, pcm_frames); 534d67c46b9STakashi Sakamoto 5353b196c39STakashi Sakamoto return 0; 5363b196c39STakashi Sakamoto } 5373b196c39STakashi Sakamoto 538e335425bSTakashi Sakamoto static int check_cip_header(struct amdtp_stream *s, const __be32 *buf, 539e335425bSTakashi Sakamoto unsigned int payload_length, 540e335425bSTakashi Sakamoto unsigned int *data_blocks, unsigned int *syt) 541d67c46b9STakashi Sakamoto { 542d67c46b9STakashi Sakamoto u32 cip_header[2]; 543e335425bSTakashi Sakamoto unsigned int sph; 544e335425bSTakashi Sakamoto unsigned int fmt; 545e335425bSTakashi Sakamoto unsigned int fdf; 546e335425bSTakashi Sakamoto unsigned int data_block_counter; 547d67c46b9STakashi Sakamoto bool lost; 548d67c46b9STakashi Sakamoto 549e335425bSTakashi Sakamoto cip_header[0] = be32_to_cpu(buf[0]); 550e335425bSTakashi Sakamoto cip_header[1] = be32_to_cpu(buf[1]); 551d67c46b9STakashi Sakamoto 552d67c46b9STakashi Sakamoto /* 553d67c46b9STakashi Sakamoto * This module supports 'Two-quadlet CIP header with SYT field'. 554d67c46b9STakashi Sakamoto * For convenience, also check FMT field is AM824 or not. 555d67c46b9STakashi Sakamoto */ 5562128f78fSTakashi Sakamoto if ((((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || 5572128f78fSTakashi Sakamoto ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH)) && 5582128f78fSTakashi Sakamoto (!(s->flags & CIP_HEADER_WITHOUT_EOH))) { 559d67c46b9STakashi Sakamoto dev_info_ratelimited(&s->unit->device, 560d67c46b9STakashi Sakamoto "Invalid CIP header for AMDTP: %08X:%08X\n", 561d67c46b9STakashi Sakamoto cip_header[0], cip_header[1]); 562e335425bSTakashi Sakamoto return -EAGAIN; 563d67c46b9STakashi Sakamoto } 564d67c46b9STakashi Sakamoto 565d67c46b9STakashi Sakamoto /* Check valid protocol or not. */ 5669863874fSTakashi Sakamoto sph = (cip_header[0] & CIP_SPH_MASK) >> CIP_SPH_SHIFT; 567d67c46b9STakashi Sakamoto fmt = (cip_header[1] & CIP_FMT_MASK) >> CIP_FMT_SHIFT; 5689863874fSTakashi Sakamoto if (sph != s->sph || fmt != s->fmt) { 5692a7e1713STakashi Sakamoto dev_info_ratelimited(&s->unit->device, 570d67c46b9STakashi Sakamoto "Detect unexpected protocol: %08x %08x\n", 571d67c46b9STakashi Sakamoto cip_header[0], cip_header[1]); 572e335425bSTakashi Sakamoto return -EAGAIN; 573d67c46b9STakashi Sakamoto } 574d67c46b9STakashi Sakamoto 575d67c46b9STakashi Sakamoto /* Calculate data blocks */ 576d67c46b9STakashi Sakamoto fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT; 577e335425bSTakashi Sakamoto if (payload_length < sizeof(__be32) * 2 || 578d67c46b9STakashi Sakamoto (fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) { 579e335425bSTakashi Sakamoto *data_blocks = 0; 580d67c46b9STakashi Sakamoto } else { 581e335425bSTakashi Sakamoto unsigned int data_block_quadlets = 582d67c46b9STakashi Sakamoto (cip_header[0] & CIP_DBS_MASK) >> CIP_DBS_SHIFT; 583d67c46b9STakashi Sakamoto /* avoid division by zero */ 584d67c46b9STakashi Sakamoto if (data_block_quadlets == 0) { 585d67c46b9STakashi Sakamoto dev_err(&s->unit->device, 586d67c46b9STakashi Sakamoto "Detect invalid value in dbs field: %08X\n", 587d67c46b9STakashi Sakamoto cip_header[0]); 588d67c46b9STakashi Sakamoto return -EPROTO; 589d67c46b9STakashi Sakamoto } 590d67c46b9STakashi Sakamoto if (s->flags & CIP_WRONG_DBS) 591d67c46b9STakashi Sakamoto data_block_quadlets = s->data_block_quadlets; 592d67c46b9STakashi Sakamoto 593e335425bSTakashi Sakamoto *data_blocks = (payload_length / sizeof(__be32) - 2) / 594ff0fb5aaSTakashi Sakamoto data_block_quadlets; 595d67c46b9STakashi Sakamoto } 596d67c46b9STakashi Sakamoto 597d67c46b9STakashi Sakamoto /* Check data block counter continuity */ 598d67c46b9STakashi Sakamoto data_block_counter = cip_header[0] & CIP_DBC_MASK; 599e335425bSTakashi Sakamoto if (*data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && 600d67c46b9STakashi Sakamoto s->data_block_counter != UINT_MAX) 601d67c46b9STakashi Sakamoto data_block_counter = s->data_block_counter; 602d67c46b9STakashi Sakamoto 603d67c46b9STakashi Sakamoto if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) && 604d3d10a4aSTakashi Sakamoto data_block_counter == s->ctx_data.tx.first_dbc) || 605d67c46b9STakashi Sakamoto s->data_block_counter == UINT_MAX) { 606d67c46b9STakashi Sakamoto lost = false; 607d67c46b9STakashi Sakamoto } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { 608d67c46b9STakashi Sakamoto lost = data_block_counter != s->data_block_counter; 609d67c46b9STakashi Sakamoto } else { 610e335425bSTakashi Sakamoto unsigned int dbc_interval; 611e335425bSTakashi Sakamoto 612e335425bSTakashi Sakamoto if (*data_blocks > 0 && s->ctx_data.tx.dbc_interval > 0) 613d3d10a4aSTakashi Sakamoto dbc_interval = s->ctx_data.tx.dbc_interval; 614d67c46b9STakashi Sakamoto else 615e335425bSTakashi Sakamoto dbc_interval = *data_blocks; 616d67c46b9STakashi Sakamoto 617d67c46b9STakashi Sakamoto lost = data_block_counter != 618d67c46b9STakashi Sakamoto ((s->data_block_counter + dbc_interval) & 0xff); 619d67c46b9STakashi Sakamoto } 620d67c46b9STakashi Sakamoto 621d67c46b9STakashi Sakamoto if (lost) { 622d67c46b9STakashi Sakamoto dev_err(&s->unit->device, 623d67c46b9STakashi Sakamoto "Detect discontinuity of CIP: %02X %02X\n", 624d67c46b9STakashi Sakamoto s->data_block_counter, data_block_counter); 625d67c46b9STakashi Sakamoto return -EIO; 626d67c46b9STakashi Sakamoto } 627d67c46b9STakashi Sakamoto 628e335425bSTakashi Sakamoto *syt = cip_header[1] & CIP_SYT_MASK; 629e335425bSTakashi Sakamoto 630e335425bSTakashi Sakamoto if (s->flags & CIP_DBC_IS_END_EVENT) { 631e335425bSTakashi Sakamoto s->data_block_counter = data_block_counter; 632e335425bSTakashi Sakamoto } else { 633e335425bSTakashi Sakamoto s->data_block_counter = 634e335425bSTakashi Sakamoto (data_block_counter + *data_blocks) & 0xff; 635e335425bSTakashi Sakamoto } 636e335425bSTakashi Sakamoto 637e335425bSTakashi Sakamoto return 0; 638e335425bSTakashi Sakamoto } 639e335425bSTakashi Sakamoto 640e335425bSTakashi Sakamoto static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle, 641e335425bSTakashi Sakamoto const __be32 *ctx_header, __be32 *buffer, 642e335425bSTakashi Sakamoto unsigned int index) 643e335425bSTakashi Sakamoto { 644e335425bSTakashi Sakamoto unsigned int payload_length; 645f11453c7STakashi Sakamoto const __be32 *cip_header; 646e335425bSTakashi Sakamoto unsigned int syt; 647e335425bSTakashi Sakamoto unsigned int data_blocks; 648e335425bSTakashi Sakamoto struct snd_pcm_substream *pcm; 649e335425bSTakashi Sakamoto unsigned int pcm_frames; 6506007bf54STakashi Sakamoto struct fw_iso_packet params = {0}; 651e335425bSTakashi Sakamoto int err; 652e335425bSTakashi Sakamoto 653e335425bSTakashi Sakamoto payload_length = be32_to_cpu(ctx_header[0]) >> ISO_DATA_LENGTH_SHIFT; 654f11453c7STakashi Sakamoto if (payload_length > s->ctx_data.tx.ctx_header_size + 655f11453c7STakashi Sakamoto s->ctx_data.tx.max_ctx_payload_length) { 656e335425bSTakashi Sakamoto dev_err(&s->unit->device, 657e335425bSTakashi Sakamoto "Detect jumbo payload: %04x %04x\n", 658f11453c7STakashi Sakamoto payload_length, s->ctx_data.tx.max_ctx_payload_length); 659e335425bSTakashi Sakamoto return -EIO; 660e335425bSTakashi Sakamoto } 661e335425bSTakashi Sakamoto 662f11453c7STakashi Sakamoto cip_header = ctx_header + 2; 663947b437eSTakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) { 664947b437eSTakashi Sakamoto cip_header = &ctx_header[2]; 665947b437eSTakashi Sakamoto err = check_cip_header(s, cip_header, payload_length, 666947b437eSTakashi Sakamoto &data_blocks, &syt); 667e335425bSTakashi Sakamoto if (err < 0) { 668e335425bSTakashi Sakamoto if (err != -EAGAIN) 669e335425bSTakashi Sakamoto return err; 670e335425bSTakashi Sakamoto pcm_frames = 0; 671e335425bSTakashi Sakamoto goto end; 672e335425bSTakashi Sakamoto } 673947b437eSTakashi Sakamoto } else { 674947b437eSTakashi Sakamoto cip_header = NULL; 675947b437eSTakashi Sakamoto data_blocks = payload_length / 4 / s->data_block_quadlets; 676947b437eSTakashi Sakamoto syt = 0; 677947b437eSTakashi Sakamoto } 678e335425bSTakashi Sakamoto 679f11453c7STakashi Sakamoto trace_amdtp_packet(s, cycle, cip_header, payload_length, data_blocks, 680f11453c7STakashi Sakamoto index); 68164d0bf4dSTakashi Sakamoto 682f11453c7STakashi Sakamoto pcm_frames = s->process_data_blocks(s, buffer, data_blocks, &syt); 683d67c46b9STakashi Sakamoto end: 6846007bf54STakashi Sakamoto if (queue_in_packet(s, ¶ms) < 0) 685d67c46b9STakashi Sakamoto return -EIO; 686d67c46b9STakashi Sakamoto 6876aa7de05SMark Rutland pcm = READ_ONCE(s->pcm); 688d67c46b9STakashi Sakamoto if (pcm && pcm_frames > 0) 689d67c46b9STakashi Sakamoto update_pcm_pointers(s, pcm, pcm_frames); 690d67c46b9STakashi Sakamoto 691d67c46b9STakashi Sakamoto return 0; 692d67c46b9STakashi Sakamoto } 693d67c46b9STakashi Sakamoto 69426cd1e58STakashi Sakamoto // In CYCLE_TIMER register of IEEE 1394, 7 bits are used to represent second. On 69526cd1e58STakashi Sakamoto // the other hand, in DMA descriptors of 1394 OHCI, 3 bits are used to represent 69626cd1e58STakashi Sakamoto // it. Thus, via Linux firewire subsystem, we can get the 3 bits for second. 69726cd1e58STakashi Sakamoto static inline u32 compute_cycle_count(__be32 ctx_header_tstamp) 69873fc7f08STakashi Sakamoto { 69926cd1e58STakashi Sakamoto u32 tstamp = be32_to_cpu(ctx_header_tstamp) & HEADER_TSTAMP_MASK; 70073fc7f08STakashi Sakamoto return (((tstamp >> 13) & 0x07) * 8000) + (tstamp & 0x1fff); 70173fc7f08STakashi Sakamoto } 70273fc7f08STakashi Sakamoto 70373fc7f08STakashi Sakamoto static inline u32 increment_cycle_count(u32 cycle, unsigned int addend) 70473fc7f08STakashi Sakamoto { 70573fc7f08STakashi Sakamoto cycle += addend; 70673fc7f08STakashi Sakamoto if (cycle >= 8 * CYCLES_PER_SECOND) 70773fc7f08STakashi Sakamoto cycle -= 8 * CYCLES_PER_SECOND; 70873fc7f08STakashi Sakamoto return cycle; 70973fc7f08STakashi Sakamoto } 71073fc7f08STakashi Sakamoto 71126cd1e58STakashi Sakamoto // Align to actual cycle count for the packet which is going to be scheduled. 71226cd1e58STakashi Sakamoto // This module queued the same number of isochronous cycle as QUEUE_LENGTH to 71326cd1e58STakashi Sakamoto // skip isochronous cycle, therefore it's OK to just increment the cycle by 71426cd1e58STakashi Sakamoto // QUEUE_LENGTH for scheduled cycle. 71526cd1e58STakashi Sakamoto static inline u32 compute_it_cycle(const __be32 ctx_header_tstamp) 71626cd1e58STakashi Sakamoto { 71726cd1e58STakashi Sakamoto u32 cycle = compute_cycle_count(ctx_header_tstamp); 71826cd1e58STakashi Sakamoto return increment_cycle_count(cycle, QUEUE_LENGTH); 71926cd1e58STakashi Sakamoto } 72026cd1e58STakashi Sakamoto 721fce9b013STakashi Sakamoto static inline void cancel_stream(struct amdtp_stream *s) 722fce9b013STakashi Sakamoto { 723fce9b013STakashi Sakamoto s->packet_index = -1; 724fce9b013STakashi Sakamoto if (in_interrupt()) 725fce9b013STakashi Sakamoto amdtp_stream_pcm_abort(s); 726fce9b013STakashi Sakamoto WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN); 727fce9b013STakashi Sakamoto } 728fce9b013STakashi Sakamoto 72973fc7f08STakashi Sakamoto static void out_stream_callback(struct fw_iso_context *context, u32 tstamp, 730d67c46b9STakashi Sakamoto size_t header_length, void *header, 731d67c46b9STakashi Sakamoto void *private_data) 732d67c46b9STakashi Sakamoto { 733d67c46b9STakashi Sakamoto struct amdtp_stream *s = private_data; 73426cd1e58STakashi Sakamoto const __be32 *ctx_header = header; 73526cd1e58STakashi Sakamoto unsigned int i, packets = header_length / sizeof(*ctx_header); 736d67c46b9STakashi Sakamoto 737d67c46b9STakashi Sakamoto if (s->packet_index < 0) 738d67c46b9STakashi Sakamoto return; 739d67c46b9STakashi Sakamoto 740d67c46b9STakashi Sakamoto for (i = 0; i < packets; ++i) { 74126cd1e58STakashi Sakamoto u32 cycle; 7428a400b99STakashi Sakamoto __be32 *buffer; 74326cd1e58STakashi Sakamoto 74426cd1e58STakashi Sakamoto cycle = compute_it_cycle(*ctx_header); 7458a400b99STakashi Sakamoto buffer = s->buffer.packets[s->packet_index].buffer; 74626cd1e58STakashi Sakamoto 74716be4589STakashi Sakamoto if (handle_out_packet(s, cycle, ctx_header, buffer, i) < 0) { 748fce9b013STakashi Sakamoto cancel_stream(s); 749d67c46b9STakashi Sakamoto return; 750d67c46b9STakashi Sakamoto } 75126cd1e58STakashi Sakamoto 75226cd1e58STakashi Sakamoto ++ctx_header; 753d67c46b9STakashi Sakamoto } 754d67c46b9STakashi Sakamoto 755d67c46b9STakashi Sakamoto fw_iso_context_queue_flush(s->context); 756d67c46b9STakashi Sakamoto } 757d67c46b9STakashi Sakamoto 75873fc7f08STakashi Sakamoto static void in_stream_callback(struct fw_iso_context *context, u32 tstamp, 759d67c46b9STakashi Sakamoto size_t header_length, void *header, 760d67c46b9STakashi Sakamoto void *private_data) 761d67c46b9STakashi Sakamoto { 762d67c46b9STakashi Sakamoto struct amdtp_stream *s = private_data; 763d9a16fc9STakashi Sakamoto unsigned int i, packets; 764cc4f8e91STakashi Sakamoto __be32 *ctx_header = header; 765d67c46b9STakashi Sakamoto 766d67c46b9STakashi Sakamoto if (s->packet_index < 0) 767d67c46b9STakashi Sakamoto return; 768d67c46b9STakashi Sakamoto 769d3d10a4aSTakashi Sakamoto // The number of packets in buffer. 770d3d10a4aSTakashi Sakamoto packets = header_length / s->ctx_data.tx.ctx_header_size; 771f90e2dedSTakashi Sakamoto 772d9a16fc9STakashi Sakamoto for (i = 0; i < packets; i++) { 77326cd1e58STakashi Sakamoto u32 cycle; 7748a400b99STakashi Sakamoto __be32 *buffer; 775cc4f8e91STakashi Sakamoto 77626cd1e58STakashi Sakamoto cycle = compute_cycle_count(ctx_header[1]); 7778a400b99STakashi Sakamoto buffer = s->buffer.packets[s->packet_index].buffer; 778d67c46b9STakashi Sakamoto 779947b437eSTakashi Sakamoto if (handle_in_packet(s, cycle, ctx_header, buffer, i) < 0) 780d67c46b9STakashi Sakamoto break; 781cc4f8e91STakashi Sakamoto 782d3d10a4aSTakashi Sakamoto ctx_header += s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header); 783d67c46b9STakashi Sakamoto } 784d67c46b9STakashi Sakamoto 785dec63cc8STakashi Sakamoto /* Queueing error or detecting invalid payload. */ 786d9a16fc9STakashi Sakamoto if (i < packets) { 787fce9b013STakashi Sakamoto cancel_stream(s); 788d67c46b9STakashi Sakamoto return; 789d67c46b9STakashi Sakamoto } 790d67c46b9STakashi Sakamoto 791d67c46b9STakashi Sakamoto fw_iso_context_queue_flush(s->context); 792d67c46b9STakashi Sakamoto } 793d67c46b9STakashi Sakamoto 794d67c46b9STakashi Sakamoto /* this is executed one time */ 795d67c46b9STakashi Sakamoto static void amdtp_stream_first_callback(struct fw_iso_context *context, 79673fc7f08STakashi Sakamoto u32 tstamp, size_t header_length, 797d67c46b9STakashi Sakamoto void *header, void *private_data) 798d67c46b9STakashi Sakamoto { 799d67c46b9STakashi Sakamoto struct amdtp_stream *s = private_data; 80026cd1e58STakashi Sakamoto const __be32 *ctx_header = header; 801a04513f8STakashi Sakamoto u32 cycle; 802d67c46b9STakashi Sakamoto 803d67c46b9STakashi Sakamoto /* 804d67c46b9STakashi Sakamoto * For in-stream, first packet has come. 805d67c46b9STakashi Sakamoto * For out-stream, prepared to transmit first packet 806d67c46b9STakashi Sakamoto */ 807d67c46b9STakashi Sakamoto s->callbacked = true; 808d67c46b9STakashi Sakamoto wake_up(&s->callback_wait); 809d67c46b9STakashi Sakamoto 810cc4f8e91STakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 81126cd1e58STakashi Sakamoto cycle = compute_cycle_count(ctx_header[1]); 812a04513f8STakashi Sakamoto 813d67c46b9STakashi Sakamoto context->callback.sc = in_stream_callback; 814a04513f8STakashi Sakamoto } else { 81526cd1e58STakashi Sakamoto cycle = compute_it_cycle(*ctx_header); 81626cd1e58STakashi Sakamoto 817d67c46b9STakashi Sakamoto context->callback.sc = out_stream_callback; 818a04513f8STakashi Sakamoto } 819a04513f8STakashi Sakamoto 820a04513f8STakashi Sakamoto s->start_cycle = cycle; 821d67c46b9STakashi Sakamoto 82273fc7f08STakashi Sakamoto context->callback.sc(context, tstamp, header_length, header, s); 823d67c46b9STakashi Sakamoto } 824d67c46b9STakashi Sakamoto 825d67c46b9STakashi Sakamoto /** 826d67c46b9STakashi Sakamoto * amdtp_stream_start - start transferring packets 827d67c46b9STakashi Sakamoto * @s: the AMDTP stream to start 828d67c46b9STakashi Sakamoto * @channel: the isochronous channel on the bus 829d67c46b9STakashi Sakamoto * @speed: firewire speed code 830d67c46b9STakashi Sakamoto * 831d67c46b9STakashi Sakamoto * The stream cannot be started until it has been configured with 832d67c46b9STakashi Sakamoto * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI 833d67c46b9STakashi Sakamoto * device can be started. 834d67c46b9STakashi Sakamoto */ 835d67c46b9STakashi Sakamoto int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) 836d67c46b9STakashi Sakamoto { 837d67c46b9STakashi Sakamoto static const struct { 838d67c46b9STakashi Sakamoto unsigned int data_block; 839d67c46b9STakashi Sakamoto unsigned int syt_offset; 840d3d10a4aSTakashi Sakamoto } *entry, initial_state[] = { 841d67c46b9STakashi Sakamoto [CIP_SFC_32000] = { 4, 3072 }, 842d67c46b9STakashi Sakamoto [CIP_SFC_48000] = { 6, 1024 }, 843d67c46b9STakashi Sakamoto [CIP_SFC_96000] = { 12, 1024 }, 844d67c46b9STakashi Sakamoto [CIP_SFC_192000] = { 24, 1024 }, 845d67c46b9STakashi Sakamoto [CIP_SFC_44100] = { 0, 67 }, 846d67c46b9STakashi Sakamoto [CIP_SFC_88200] = { 0, 67 }, 847d67c46b9STakashi Sakamoto [CIP_SFC_176400] = { 0, 67 }, 848d67c46b9STakashi Sakamoto }; 849d3d10a4aSTakashi Sakamoto unsigned int ctx_header_size; 850f11453c7STakashi Sakamoto unsigned int max_ctx_payload_size; 851d67c46b9STakashi Sakamoto enum dma_data_direction dir; 852d67c46b9STakashi Sakamoto int type, tag, err; 853d67c46b9STakashi Sakamoto 854d67c46b9STakashi Sakamoto mutex_lock(&s->mutex); 855d67c46b9STakashi Sakamoto 856d67c46b9STakashi Sakamoto if (WARN_ON(amdtp_stream_running(s) || 857d67c46b9STakashi Sakamoto (s->data_block_quadlets < 1))) { 858d67c46b9STakashi Sakamoto err = -EBADFD; 859d67c46b9STakashi Sakamoto goto err_unlock; 860d67c46b9STakashi Sakamoto } 861d67c46b9STakashi Sakamoto 862d3d10a4aSTakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 863d67c46b9STakashi Sakamoto s->data_block_counter = UINT_MAX; 864d3d10a4aSTakashi Sakamoto } else { 865d3d10a4aSTakashi Sakamoto entry = &initial_state[s->sfc]; 866d3d10a4aSTakashi Sakamoto 867d67c46b9STakashi Sakamoto s->data_block_counter = 0; 868d3d10a4aSTakashi Sakamoto s->ctx_data.rx.data_block_state = entry->data_block; 869d3d10a4aSTakashi Sakamoto s->ctx_data.rx.syt_offset_state = entry->syt_offset; 870d3d10a4aSTakashi Sakamoto s->ctx_data.rx.last_syt_offset = TICKS_PER_CYCLE; 871d3d10a4aSTakashi Sakamoto } 872d67c46b9STakashi Sakamoto 873d67c46b9STakashi Sakamoto /* initialize packet buffer */ 874d67c46b9STakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 875d67c46b9STakashi Sakamoto dir = DMA_FROM_DEVICE; 876d67c46b9STakashi Sakamoto type = FW_ISO_CONTEXT_RECEIVE; 877f11453c7STakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) 878f11453c7STakashi Sakamoto ctx_header_size = IR_CTX_HEADER_SIZE_CIP; 879f11453c7STakashi Sakamoto else 880f11453c7STakashi Sakamoto ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP; 881*b18f0cfaSTakashi Sakamoto 882*b18f0cfaSTakashi Sakamoto max_ctx_payload_size = amdtp_stream_get_max_payload(s) - 883*b18f0cfaSTakashi Sakamoto ctx_header_size; 884d67c46b9STakashi Sakamoto } else { 885d67c46b9STakashi Sakamoto dir = DMA_TO_DEVICE; 886d67c46b9STakashi Sakamoto type = FW_ISO_CONTEXT_TRANSMIT; 887df9160b9STakashi Sakamoto ctx_header_size = 0; // No effect for IT context. 888f11453c7STakashi Sakamoto 889*b18f0cfaSTakashi Sakamoto max_ctx_payload_size = amdtp_stream_get_max_payload(s); 890*b18f0cfaSTakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) 891*b18f0cfaSTakashi Sakamoto max_ctx_payload_size -= IT_PKT_HEADER_SIZE_CIP; 892*b18f0cfaSTakashi Sakamoto } 893f11453c7STakashi Sakamoto 894d67c46b9STakashi Sakamoto err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, 895f11453c7STakashi Sakamoto max_ctx_payload_size, dir); 896d67c46b9STakashi Sakamoto if (err < 0) 897d67c46b9STakashi Sakamoto goto err_unlock; 898d67c46b9STakashi Sakamoto 899d67c46b9STakashi Sakamoto s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, 900d3d10a4aSTakashi Sakamoto type, channel, speed, ctx_header_size, 901d67c46b9STakashi Sakamoto amdtp_stream_first_callback, s); 902d67c46b9STakashi Sakamoto if (IS_ERR(s->context)) { 903d67c46b9STakashi Sakamoto err = PTR_ERR(s->context); 904d67c46b9STakashi Sakamoto if (err == -EBUSY) 905d67c46b9STakashi Sakamoto dev_err(&s->unit->device, 906d67c46b9STakashi Sakamoto "no free stream on this controller\n"); 907d67c46b9STakashi Sakamoto goto err_buffer; 908d67c46b9STakashi Sakamoto } 909d67c46b9STakashi Sakamoto 910d67c46b9STakashi Sakamoto amdtp_stream_update(s); 911d67c46b9STakashi Sakamoto 912d3d10a4aSTakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 913f11453c7STakashi Sakamoto s->ctx_data.tx.max_ctx_payload_length = max_ctx_payload_size; 914d3d10a4aSTakashi Sakamoto s->ctx_data.tx.ctx_header_size = ctx_header_size; 915d3d10a4aSTakashi Sakamoto } 91652759c09STakashi Sakamoto 9173b196c39STakashi Sakamoto if (s->flags & CIP_NO_HEADER) 9183b196c39STakashi Sakamoto s->tag = TAG_NO_CIP_HEADER; 9193b196c39STakashi Sakamoto else 9203b196c39STakashi Sakamoto s->tag = TAG_CIP; 9213b196c39STakashi Sakamoto 922d67c46b9STakashi Sakamoto s->packet_index = 0; 923d67c46b9STakashi Sakamoto do { 9246007bf54STakashi Sakamoto struct fw_iso_packet params; 925*b18f0cfaSTakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 9266007bf54STakashi Sakamoto err = queue_in_packet(s, ¶ms); 927*b18f0cfaSTakashi Sakamoto } else { 928*b18f0cfaSTakashi Sakamoto params.header_length = 0; 929*b18f0cfaSTakashi Sakamoto params.payload_length = 0; 930*b18f0cfaSTakashi Sakamoto err = queue_out_packet(s, ¶ms); 931*b18f0cfaSTakashi Sakamoto } 932d67c46b9STakashi Sakamoto if (err < 0) 933d67c46b9STakashi Sakamoto goto err_context; 934d67c46b9STakashi Sakamoto } while (s->packet_index > 0); 935d67c46b9STakashi Sakamoto 936d67c46b9STakashi Sakamoto /* NOTE: TAG1 matches CIP. This just affects in stream. */ 937d67c46b9STakashi Sakamoto tag = FW_ISO_CONTEXT_MATCH_TAG1; 9383b196c39STakashi Sakamoto if ((s->flags & CIP_EMPTY_WITH_TAG0) || (s->flags & CIP_NO_HEADER)) 939d67c46b9STakashi Sakamoto tag |= FW_ISO_CONTEXT_MATCH_TAG0; 940d67c46b9STakashi Sakamoto 941d67c46b9STakashi Sakamoto s->callbacked = false; 942d67c46b9STakashi Sakamoto err = fw_iso_context_start(s->context, -1, 0, tag); 943d67c46b9STakashi Sakamoto if (err < 0) 944d67c46b9STakashi Sakamoto goto err_context; 945d67c46b9STakashi Sakamoto 946d67c46b9STakashi Sakamoto mutex_unlock(&s->mutex); 947d67c46b9STakashi Sakamoto 948d67c46b9STakashi Sakamoto return 0; 949d67c46b9STakashi Sakamoto 950d67c46b9STakashi Sakamoto err_context: 951d67c46b9STakashi Sakamoto fw_iso_context_destroy(s->context); 952d67c46b9STakashi Sakamoto s->context = ERR_PTR(-1); 953d67c46b9STakashi Sakamoto err_buffer: 954d67c46b9STakashi Sakamoto iso_packets_buffer_destroy(&s->buffer, s->unit); 955d67c46b9STakashi Sakamoto err_unlock: 956d67c46b9STakashi Sakamoto mutex_unlock(&s->mutex); 957d67c46b9STakashi Sakamoto 958d67c46b9STakashi Sakamoto return err; 959d67c46b9STakashi Sakamoto } 960d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_start); 961d67c46b9STakashi Sakamoto 962d67c46b9STakashi Sakamoto /** 963d67c46b9STakashi Sakamoto * amdtp_stream_pcm_pointer - get the PCM buffer position 964d67c46b9STakashi Sakamoto * @s: the AMDTP stream that transports the PCM data 965d67c46b9STakashi Sakamoto * 966d67c46b9STakashi Sakamoto * Returns the current buffer position, in frames. 967d67c46b9STakashi Sakamoto */ 968d67c46b9STakashi Sakamoto unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) 969d67c46b9STakashi Sakamoto { 9701dba9db0STakashi Sakamoto /* 9711dba9db0STakashi Sakamoto * This function is called in software IRQ context of period_tasklet or 9721dba9db0STakashi Sakamoto * process context. 9731dba9db0STakashi Sakamoto * 9741dba9db0STakashi Sakamoto * When the software IRQ context was scheduled by software IRQ context 9751dba9db0STakashi Sakamoto * of IR/IT contexts, queued packets were already handled. Therefore, 9761dba9db0STakashi Sakamoto * no need to flush the queue in buffer anymore. 9771dba9db0STakashi Sakamoto * 9781dba9db0STakashi Sakamoto * When the process context reach here, some packets will be already 9791dba9db0STakashi Sakamoto * queued in the buffer. These packets should be handled immediately 9801dba9db0STakashi Sakamoto * to keep better granularity of PCM pointer. 9811dba9db0STakashi Sakamoto * 9821dba9db0STakashi Sakamoto * Later, the process context will sometimes schedules software IRQ 9831dba9db0STakashi Sakamoto * context of the period_tasklet. Then, no need to flush the queue by 9841dba9db0STakashi Sakamoto * the same reason as described for IR/IT contexts. 9851dba9db0STakashi Sakamoto */ 9861dba9db0STakashi Sakamoto if (!in_interrupt() && amdtp_stream_running(s)) 987d67c46b9STakashi Sakamoto fw_iso_context_flush_completions(s->context); 988d67c46b9STakashi Sakamoto 9896aa7de05SMark Rutland return READ_ONCE(s->pcm_buffer_pointer); 990d67c46b9STakashi Sakamoto } 991d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_pcm_pointer); 992d67c46b9STakashi Sakamoto 993d67c46b9STakashi Sakamoto /** 994875becf8STakashi Sakamoto * amdtp_stream_pcm_ack - acknowledge queued PCM frames 995875becf8STakashi Sakamoto * @s: the AMDTP stream that transfers the PCM frames 996875becf8STakashi Sakamoto * 997875becf8STakashi Sakamoto * Returns zero always. 998875becf8STakashi Sakamoto */ 999875becf8STakashi Sakamoto int amdtp_stream_pcm_ack(struct amdtp_stream *s) 1000875becf8STakashi Sakamoto { 1001875becf8STakashi Sakamoto /* 1002875becf8STakashi Sakamoto * Process isochronous packets for recent isochronous cycle to handle 1003875becf8STakashi Sakamoto * queued PCM frames. 1004875becf8STakashi Sakamoto */ 1005875becf8STakashi Sakamoto if (amdtp_stream_running(s)) 1006875becf8STakashi Sakamoto fw_iso_context_flush_completions(s->context); 1007875becf8STakashi Sakamoto 1008875becf8STakashi Sakamoto return 0; 1009875becf8STakashi Sakamoto } 1010875becf8STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_pcm_ack); 1011875becf8STakashi Sakamoto 1012875becf8STakashi Sakamoto /** 1013d67c46b9STakashi Sakamoto * amdtp_stream_update - update the stream after a bus reset 1014d67c46b9STakashi Sakamoto * @s: the AMDTP stream 1015d67c46b9STakashi Sakamoto */ 1016d67c46b9STakashi Sakamoto void amdtp_stream_update(struct amdtp_stream *s) 1017d67c46b9STakashi Sakamoto { 1018d67c46b9STakashi Sakamoto /* Precomputing. */ 10196aa7de05SMark Rutland WRITE_ONCE(s->source_node_id_field, 10206aa7de05SMark Rutland (fw_parent_device(s->unit)->card->node_id << CIP_SID_SHIFT) & CIP_SID_MASK); 1021d67c46b9STakashi Sakamoto } 1022d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_update); 1023d67c46b9STakashi Sakamoto 1024d67c46b9STakashi Sakamoto /** 1025d67c46b9STakashi Sakamoto * amdtp_stream_stop - stop sending packets 1026d67c46b9STakashi Sakamoto * @s: the AMDTP stream to stop 1027d67c46b9STakashi Sakamoto * 1028d67c46b9STakashi Sakamoto * All PCM and MIDI devices of the stream must be stopped before the stream 1029d67c46b9STakashi Sakamoto * itself can be stopped. 1030d67c46b9STakashi Sakamoto */ 1031d67c46b9STakashi Sakamoto void amdtp_stream_stop(struct amdtp_stream *s) 1032d67c46b9STakashi Sakamoto { 1033d67c46b9STakashi Sakamoto mutex_lock(&s->mutex); 1034d67c46b9STakashi Sakamoto 1035d67c46b9STakashi Sakamoto if (!amdtp_stream_running(s)) { 1036d67c46b9STakashi Sakamoto mutex_unlock(&s->mutex); 1037d67c46b9STakashi Sakamoto return; 1038d67c46b9STakashi Sakamoto } 1039d67c46b9STakashi Sakamoto 1040d67c46b9STakashi Sakamoto tasklet_kill(&s->period_tasklet); 1041d67c46b9STakashi Sakamoto fw_iso_context_stop(s->context); 1042d67c46b9STakashi Sakamoto fw_iso_context_destroy(s->context); 1043d67c46b9STakashi Sakamoto s->context = ERR_PTR(-1); 1044d67c46b9STakashi Sakamoto iso_packets_buffer_destroy(&s->buffer, s->unit); 1045d67c46b9STakashi Sakamoto 1046d67c46b9STakashi Sakamoto s->callbacked = false; 1047d67c46b9STakashi Sakamoto 1048d67c46b9STakashi Sakamoto mutex_unlock(&s->mutex); 1049d67c46b9STakashi Sakamoto } 1050d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_stop); 1051d67c46b9STakashi Sakamoto 1052d67c46b9STakashi Sakamoto /** 1053d67c46b9STakashi Sakamoto * amdtp_stream_pcm_abort - abort the running PCM device 1054d67c46b9STakashi Sakamoto * @s: the AMDTP stream about to be stopped 1055d67c46b9STakashi Sakamoto * 1056d67c46b9STakashi Sakamoto * If the isochronous stream needs to be stopped asynchronously, call this 1057d67c46b9STakashi Sakamoto * function first to stop the PCM device. 1058d67c46b9STakashi Sakamoto */ 1059d67c46b9STakashi Sakamoto void amdtp_stream_pcm_abort(struct amdtp_stream *s) 1060d67c46b9STakashi Sakamoto { 1061d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm; 1062d67c46b9STakashi Sakamoto 10636aa7de05SMark Rutland pcm = READ_ONCE(s->pcm); 1064d67c46b9STakashi Sakamoto if (pcm) 1065d67c46b9STakashi Sakamoto snd_pcm_stop_xrun(pcm); 1066d67c46b9STakashi Sakamoto } 1067d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_pcm_abort); 1068