1da607e19SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2d67c46b9STakashi Sakamoto /* 3d67c46b9STakashi Sakamoto * Audio and Music Data Transmission Protocol (IEC 61883-6) streams 4d67c46b9STakashi Sakamoto * with Common Isochronous Packet (IEC 61883-1) headers 5d67c46b9STakashi Sakamoto * 6d67c46b9STakashi Sakamoto * Copyright (c) Clemens Ladisch <clemens@ladisch.de> 7d67c46b9STakashi Sakamoto */ 8d67c46b9STakashi Sakamoto 9d67c46b9STakashi Sakamoto #include <linux/device.h> 10d67c46b9STakashi Sakamoto #include <linux/err.h> 11d67c46b9STakashi Sakamoto #include <linux/firewire.h> 12acfedcbeSTakashi Sakamoto #include <linux/firewire-constants.h> 13d67c46b9STakashi Sakamoto #include <linux/module.h> 14d67c46b9STakashi Sakamoto #include <linux/slab.h> 15d67c46b9STakashi Sakamoto #include <sound/pcm.h> 16d67c46b9STakashi Sakamoto #include <sound/pcm_params.h> 17d67c46b9STakashi Sakamoto #include "amdtp-stream.h" 18d67c46b9STakashi Sakamoto 19d67c46b9STakashi Sakamoto #define TICKS_PER_CYCLE 3072 20d67c46b9STakashi Sakamoto #define CYCLES_PER_SECOND 8000 21d67c46b9STakashi Sakamoto #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) 22d67c46b9STakashi Sakamoto 2310aa8e4aSTakashi Sakamoto #define OHCI_MAX_SECOND 8 2410aa8e4aSTakashi Sakamoto 250c95c1d6STakashi Sakamoto /* Always support Linux tracing subsystem. */ 260c95c1d6STakashi Sakamoto #define CREATE_TRACE_POINTS 270c95c1d6STakashi Sakamoto #include "amdtp-stream-trace.h" 280c95c1d6STakashi Sakamoto 29d67c46b9STakashi Sakamoto #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 microseconds */ 30d67c46b9STakashi Sakamoto 31d67c46b9STakashi Sakamoto /* isochronous header parameters */ 32d67c46b9STakashi Sakamoto #define ISO_DATA_LENGTH_SHIFT 16 333b196c39STakashi Sakamoto #define TAG_NO_CIP_HEADER 0 34d67c46b9STakashi Sakamoto #define TAG_CIP 1 35d67c46b9STakashi Sakamoto 36d67c46b9STakashi Sakamoto /* common isochronous packet header parameters */ 37d67c46b9STakashi Sakamoto #define CIP_EOH_SHIFT 31 38d67c46b9STakashi Sakamoto #define CIP_EOH (1u << CIP_EOH_SHIFT) 39d67c46b9STakashi Sakamoto #define CIP_EOH_MASK 0x80000000 40d67c46b9STakashi Sakamoto #define CIP_SID_SHIFT 24 41d67c46b9STakashi Sakamoto #define CIP_SID_MASK 0x3f000000 42d67c46b9STakashi Sakamoto #define CIP_DBS_MASK 0x00ff0000 43d67c46b9STakashi Sakamoto #define CIP_DBS_SHIFT 16 449863874fSTakashi Sakamoto #define CIP_SPH_MASK 0x00000400 459863874fSTakashi Sakamoto #define CIP_SPH_SHIFT 10 46d67c46b9STakashi Sakamoto #define CIP_DBC_MASK 0x000000ff 47d67c46b9STakashi Sakamoto #define CIP_FMT_SHIFT 24 48d67c46b9STakashi Sakamoto #define CIP_FMT_MASK 0x3f000000 49d67c46b9STakashi Sakamoto #define CIP_FDF_MASK 0x00ff0000 50d67c46b9STakashi Sakamoto #define CIP_FDF_SHIFT 16 51d67c46b9STakashi Sakamoto #define CIP_SYT_MASK 0x0000ffff 52d67c46b9STakashi Sakamoto #define CIP_SYT_NO_INFO 0xffff 53d67c46b9STakashi Sakamoto 5451c29fd2STakashi Sakamoto /* Audio and Music transfer protocol specific parameters */ 55d67c46b9STakashi Sakamoto #define CIP_FMT_AM 0x10 56d67c46b9STakashi Sakamoto #define AMDTP_FDF_NO_DATA 0xff 57d67c46b9STakashi Sakamoto 58f11453c7STakashi Sakamoto // For iso header, tstamp and 2 CIP header. 59f11453c7STakashi Sakamoto #define IR_CTX_HEADER_SIZE_CIP 16 60f11453c7STakashi Sakamoto // For iso header and tstamp. 61f11453c7STakashi Sakamoto #define IR_CTX_HEADER_SIZE_NO_CIP 8 62cc4f8e91STakashi Sakamoto #define HEADER_TSTAMP_MASK 0x0000ffff 63d67c46b9STakashi Sakamoto 64b18f0cfaSTakashi Sakamoto #define IT_PKT_HEADER_SIZE_CIP 8 // For 2 CIP header. 65b18f0cfaSTakashi Sakamoto #define IT_PKT_HEADER_SIZE_NO_CIP 0 // Nothing. 66b18f0cfaSTakashi Sakamoto 67d67c46b9STakashi Sakamoto static void pcm_period_tasklet(unsigned long data); 68d67c46b9STakashi Sakamoto 69d67c46b9STakashi Sakamoto /** 70d67c46b9STakashi Sakamoto * amdtp_stream_init - initialize an AMDTP stream structure 71d67c46b9STakashi Sakamoto * @s: the AMDTP stream to initialize 72d67c46b9STakashi Sakamoto * @unit: the target of the stream 73d67c46b9STakashi Sakamoto * @dir: the direction of stream 74d67c46b9STakashi Sakamoto * @flags: the packet transmission method to use 755955815eSTakashi Sakamoto * @fmt: the value of fmt field in CIP header 769a738ad1STakashi Sakamoto * @process_ctx_payloads: callback handler to process payloads of isoc context 77df075feeSTakashi Sakamoto * @protocol_size: the size to allocate newly for protocol 78d67c46b9STakashi Sakamoto */ 79d67c46b9STakashi Sakamoto int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, 805955815eSTakashi Sakamoto enum amdtp_stream_direction dir, enum cip_flags flags, 81df075feeSTakashi Sakamoto unsigned int fmt, 829a738ad1STakashi Sakamoto amdtp_stream_process_ctx_payloads_t process_ctx_payloads, 83df075feeSTakashi Sakamoto unsigned int protocol_size) 84d67c46b9STakashi Sakamoto { 859a738ad1STakashi Sakamoto if (process_ctx_payloads == NULL) 86df075feeSTakashi Sakamoto return -EINVAL; 87df075feeSTakashi Sakamoto 88df075feeSTakashi Sakamoto s->protocol = kzalloc(protocol_size, GFP_KERNEL); 89df075feeSTakashi Sakamoto if (!s->protocol) 90df075feeSTakashi Sakamoto return -ENOMEM; 91df075feeSTakashi Sakamoto 92d67c46b9STakashi Sakamoto s->unit = unit; 93d67c46b9STakashi Sakamoto s->direction = dir; 94d67c46b9STakashi Sakamoto s->flags = flags; 95d67c46b9STakashi Sakamoto s->context = ERR_PTR(-1); 96d67c46b9STakashi Sakamoto mutex_init(&s->mutex); 97d67c46b9STakashi Sakamoto tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); 98d67c46b9STakashi Sakamoto s->packet_index = 0; 99d67c46b9STakashi Sakamoto 100d67c46b9STakashi Sakamoto init_waitqueue_head(&s->callback_wait); 101d67c46b9STakashi Sakamoto s->callbacked = false; 102d67c46b9STakashi Sakamoto 1035955815eSTakashi Sakamoto s->fmt = fmt; 1049a738ad1STakashi Sakamoto s->process_ctx_payloads = process_ctx_payloads; 105d67c46b9STakashi Sakamoto 1063baf3053STakashi Sakamoto if (dir == AMDTP_OUT_STREAM) 1073baf3053STakashi Sakamoto s->ctx_data.rx.syt_override = -1; 1083baf3053STakashi Sakamoto 109d67c46b9STakashi Sakamoto return 0; 110d67c46b9STakashi Sakamoto } 111d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_init); 112d67c46b9STakashi Sakamoto 113d67c46b9STakashi Sakamoto /** 114d67c46b9STakashi Sakamoto * amdtp_stream_destroy - free stream resources 115d67c46b9STakashi Sakamoto * @s: the AMDTP stream to destroy 116d67c46b9STakashi Sakamoto */ 117d67c46b9STakashi Sakamoto void amdtp_stream_destroy(struct amdtp_stream *s) 118d67c46b9STakashi Sakamoto { 11944c376b9STakashi Sakamoto /* Not initialized. */ 12044c376b9STakashi Sakamoto if (s->protocol == NULL) 12144c376b9STakashi Sakamoto return; 12244c376b9STakashi Sakamoto 123d67c46b9STakashi Sakamoto WARN_ON(amdtp_stream_running(s)); 124df075feeSTakashi Sakamoto kfree(s->protocol); 125d67c46b9STakashi Sakamoto mutex_destroy(&s->mutex); 126d67c46b9STakashi Sakamoto } 127d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_destroy); 128d67c46b9STakashi Sakamoto 129d67c46b9STakashi Sakamoto const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { 130d67c46b9STakashi Sakamoto [CIP_SFC_32000] = 8, 131d67c46b9STakashi Sakamoto [CIP_SFC_44100] = 8, 132d67c46b9STakashi Sakamoto [CIP_SFC_48000] = 8, 133d67c46b9STakashi Sakamoto [CIP_SFC_88200] = 16, 134d67c46b9STakashi Sakamoto [CIP_SFC_96000] = 16, 135d67c46b9STakashi Sakamoto [CIP_SFC_176400] = 32, 136d67c46b9STakashi Sakamoto [CIP_SFC_192000] = 32, 137d67c46b9STakashi Sakamoto }; 138d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_syt_intervals); 139d67c46b9STakashi Sakamoto 140d67c46b9STakashi Sakamoto const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = { 141d67c46b9STakashi Sakamoto [CIP_SFC_32000] = 32000, 142d67c46b9STakashi Sakamoto [CIP_SFC_44100] = 44100, 143d67c46b9STakashi Sakamoto [CIP_SFC_48000] = 48000, 144d67c46b9STakashi Sakamoto [CIP_SFC_88200] = 88200, 145d67c46b9STakashi Sakamoto [CIP_SFC_96000] = 96000, 146d67c46b9STakashi Sakamoto [CIP_SFC_176400] = 176400, 147d67c46b9STakashi Sakamoto [CIP_SFC_192000] = 192000, 148d67c46b9STakashi Sakamoto }; 149d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_rate_table); 150d67c46b9STakashi Sakamoto 15159502295STakashi Sakamoto static int apply_constraint_to_size(struct snd_pcm_hw_params *params, 15259502295STakashi Sakamoto struct snd_pcm_hw_rule *rule) 15359502295STakashi Sakamoto { 15459502295STakashi Sakamoto struct snd_interval *s = hw_param_interval(params, rule->var); 15559502295STakashi Sakamoto const struct snd_interval *r = 15659502295STakashi Sakamoto hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 157826b5de9STakashi Sakamoto struct snd_interval t = {0}; 158826b5de9STakashi Sakamoto unsigned int step = 0; 15959502295STakashi Sakamoto int i; 16059502295STakashi Sakamoto 16159502295STakashi Sakamoto for (i = 0; i < CIP_SFC_COUNT; ++i) { 162826b5de9STakashi Sakamoto if (snd_interval_test(r, amdtp_rate_table[i])) 163826b5de9STakashi Sakamoto step = max(step, amdtp_syt_intervals[i]); 16459502295STakashi Sakamoto } 16559502295STakashi Sakamoto 166826b5de9STakashi Sakamoto t.min = roundup(s->min, step); 167826b5de9STakashi Sakamoto t.max = rounddown(s->max, step); 168826b5de9STakashi Sakamoto t.integer = 1; 16959502295STakashi Sakamoto 17059502295STakashi Sakamoto return snd_interval_refine(s, &t); 17159502295STakashi Sakamoto } 17259502295STakashi Sakamoto 173d67c46b9STakashi Sakamoto /** 174d67c46b9STakashi Sakamoto * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream 175d67c46b9STakashi Sakamoto * @s: the AMDTP stream, which must be initialized. 176d67c46b9STakashi Sakamoto * @runtime: the PCM substream runtime 177d67c46b9STakashi Sakamoto */ 178d67c46b9STakashi Sakamoto int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, 179d67c46b9STakashi Sakamoto struct snd_pcm_runtime *runtime) 180d67c46b9STakashi Sakamoto { 18155799c5aSTakashi Sakamoto struct snd_pcm_hardware *hw = &runtime->hw; 18299921ec6STakashi Sakamoto unsigned int ctx_header_size; 18399921ec6STakashi Sakamoto unsigned int maximum_usec_per_period; 184d67c46b9STakashi Sakamoto int err; 185d67c46b9STakashi Sakamoto 18655799c5aSTakashi Sakamoto hw->info = SNDRV_PCM_INFO_BATCH | 18755799c5aSTakashi Sakamoto SNDRV_PCM_INFO_BLOCK_TRANSFER | 18855799c5aSTakashi Sakamoto SNDRV_PCM_INFO_INTERLEAVED | 18955799c5aSTakashi Sakamoto SNDRV_PCM_INFO_JOINT_DUPLEX | 19055799c5aSTakashi Sakamoto SNDRV_PCM_INFO_MMAP | 19155799c5aSTakashi Sakamoto SNDRV_PCM_INFO_MMAP_VALID; 19255799c5aSTakashi Sakamoto 19355799c5aSTakashi Sakamoto /* SNDRV_PCM_INFO_BATCH */ 19455799c5aSTakashi Sakamoto hw->periods_min = 2; 19555799c5aSTakashi Sakamoto hw->periods_max = UINT_MAX; 19655799c5aSTakashi Sakamoto 19755799c5aSTakashi Sakamoto /* bytes for a frame */ 19855799c5aSTakashi Sakamoto hw->period_bytes_min = 4 * hw->channels_max; 19955799c5aSTakashi Sakamoto 20055799c5aSTakashi Sakamoto /* Just to prevent from allocating much pages. */ 20155799c5aSTakashi Sakamoto hw->period_bytes_max = hw->period_bytes_min * 2048; 20255799c5aSTakashi Sakamoto hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; 20355799c5aSTakashi Sakamoto 20499921ec6STakashi Sakamoto // Linux driver for 1394 OHCI controller voluntarily flushes isoc 20599921ec6STakashi Sakamoto // context when total size of accumulated context header reaches 20699921ec6STakashi Sakamoto // PAGE_SIZE. This kicks tasklet for the isoc context and brings 20799921ec6STakashi Sakamoto // callback in the middle of scheduled interrupts. 20899921ec6STakashi Sakamoto // Although AMDTP streams in the same domain use the same events per 20999921ec6STakashi Sakamoto // IRQ, use the largest size of context header between IT/IR contexts. 21099921ec6STakashi Sakamoto // Here, use the value of context header in IR context is for both 21199921ec6STakashi Sakamoto // contexts. 21299921ec6STakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) 21399921ec6STakashi Sakamoto ctx_header_size = IR_CTX_HEADER_SIZE_CIP; 21499921ec6STakashi Sakamoto else 21599921ec6STakashi Sakamoto ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP; 21699921ec6STakashi Sakamoto maximum_usec_per_period = USEC_PER_SEC * PAGE_SIZE / 21799921ec6STakashi Sakamoto CYCLES_PER_SECOND / ctx_header_size; 21899921ec6STakashi Sakamoto 219f706df4fSTakashi Sakamoto // In IEC 61883-6, one isoc packet can transfer events up to the value 220f706df4fSTakashi Sakamoto // of syt interval. This comes from the interval of isoc cycle. As 1394 221f706df4fSTakashi Sakamoto // OHCI controller can generate hardware IRQ per isoc packet, the 222f706df4fSTakashi Sakamoto // interval is 125 usec. 223f706df4fSTakashi Sakamoto // However, there are two ways of transmission in IEC 61883-6; blocking 224f706df4fSTakashi Sakamoto // and non-blocking modes. In blocking mode, the sequence of isoc packet 225f706df4fSTakashi Sakamoto // includes 'empty' or 'NODATA' packets which include no event. In 226f706df4fSTakashi Sakamoto // non-blocking mode, the number of events per packet is variable up to 227f706df4fSTakashi Sakamoto // the syt interval. 228f706df4fSTakashi Sakamoto // Due to the above protocol design, the minimum PCM frames per 229f706df4fSTakashi Sakamoto // interrupt should be double of the value of syt interval, thus it is 230f706df4fSTakashi Sakamoto // 250 usec. 231d67c46b9STakashi Sakamoto err = snd_pcm_hw_constraint_minmax(runtime, 232d67c46b9STakashi Sakamoto SNDRV_PCM_HW_PARAM_PERIOD_TIME, 233f706df4fSTakashi Sakamoto 250, maximum_usec_per_period); 234d67c46b9STakashi Sakamoto if (err < 0) 235d67c46b9STakashi Sakamoto goto end; 236d67c46b9STakashi Sakamoto 237d67c46b9STakashi Sakamoto /* Non-Blocking stream has no more constraints */ 238d67c46b9STakashi Sakamoto if (!(s->flags & CIP_BLOCKING)) 239d67c46b9STakashi Sakamoto goto end; 240d67c46b9STakashi Sakamoto 241d67c46b9STakashi Sakamoto /* 242d67c46b9STakashi Sakamoto * One AMDTP packet can include some frames. In blocking mode, the 243d67c46b9STakashi Sakamoto * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, 244d67c46b9STakashi Sakamoto * depending on its sampling rate. For accurate period interrupt, it's 245d67c46b9STakashi Sakamoto * preferrable to align period/buffer sizes to current SYT_INTERVAL. 246d67c46b9STakashi Sakamoto */ 24759502295STakashi Sakamoto err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 24859502295STakashi Sakamoto apply_constraint_to_size, NULL, 249826b5de9STakashi Sakamoto SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 25059502295STakashi Sakamoto SNDRV_PCM_HW_PARAM_RATE, -1); 251d67c46b9STakashi Sakamoto if (err < 0) 252d67c46b9STakashi Sakamoto goto end; 25359502295STakashi Sakamoto err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 25459502295STakashi Sakamoto apply_constraint_to_size, NULL, 255826b5de9STakashi Sakamoto SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 25659502295STakashi Sakamoto SNDRV_PCM_HW_PARAM_RATE, -1); 25759502295STakashi Sakamoto if (err < 0) 25859502295STakashi Sakamoto goto end; 259d67c46b9STakashi Sakamoto end: 260d67c46b9STakashi Sakamoto return err; 261d67c46b9STakashi Sakamoto } 262d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); 263d67c46b9STakashi Sakamoto 264d67c46b9STakashi Sakamoto /** 265d67c46b9STakashi Sakamoto * amdtp_stream_set_parameters - set stream parameters 266d67c46b9STakashi Sakamoto * @s: the AMDTP stream to configure 267d67c46b9STakashi Sakamoto * @rate: the sample rate 268df075feeSTakashi Sakamoto * @data_block_quadlets: the size of a data block in quadlet unit 269d67c46b9STakashi Sakamoto * 270d67c46b9STakashi Sakamoto * The parameters must be set before the stream is started, and must not be 271d67c46b9STakashi Sakamoto * changed while the stream is running. 272d67c46b9STakashi Sakamoto */ 273df075feeSTakashi Sakamoto int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, 274df075feeSTakashi Sakamoto unsigned int data_block_quadlets) 275d67c46b9STakashi Sakamoto { 276df075feeSTakashi Sakamoto unsigned int sfc; 277d67c46b9STakashi Sakamoto 278d67c46b9STakashi Sakamoto for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) { 279d67c46b9STakashi Sakamoto if (amdtp_rate_table[sfc] == rate) 280d67c46b9STakashi Sakamoto break; 281d67c46b9STakashi Sakamoto } 282d67c46b9STakashi Sakamoto if (sfc == ARRAY_SIZE(amdtp_rate_table)) 283d67c46b9STakashi Sakamoto return -EINVAL; 284d67c46b9STakashi Sakamoto 285d67c46b9STakashi Sakamoto s->sfc = sfc; 286df075feeSTakashi Sakamoto s->data_block_quadlets = data_block_quadlets; 287d67c46b9STakashi Sakamoto s->syt_interval = amdtp_syt_intervals[sfc]; 288d67c46b9STakashi Sakamoto 289d3d10a4aSTakashi Sakamoto // default buffering in the device. 290d3d10a4aSTakashi Sakamoto if (s->direction == AMDTP_OUT_STREAM) { 291d3d10a4aSTakashi Sakamoto s->ctx_data.rx.transfer_delay = 292d3d10a4aSTakashi Sakamoto TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; 293d3d10a4aSTakashi Sakamoto 294d3d10a4aSTakashi Sakamoto if (s->flags & CIP_BLOCKING) { 295d3d10a4aSTakashi Sakamoto // additional buffering needed to adjust for no-data 296d3d10a4aSTakashi Sakamoto // packets. 297d3d10a4aSTakashi Sakamoto s->ctx_data.rx.transfer_delay += 298d3d10a4aSTakashi Sakamoto TICKS_PER_SECOND * s->syt_interval / rate; 299d3d10a4aSTakashi Sakamoto } 300d3d10a4aSTakashi Sakamoto } 301d67c46b9STakashi Sakamoto 302d67c46b9STakashi Sakamoto return 0; 303d67c46b9STakashi Sakamoto } 304d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_set_parameters); 305d67c46b9STakashi Sakamoto 306d67c46b9STakashi Sakamoto /** 307d67c46b9STakashi Sakamoto * amdtp_stream_get_max_payload - get the stream's packet size 308d67c46b9STakashi Sakamoto * @s: the AMDTP stream 309d67c46b9STakashi Sakamoto * 310d67c46b9STakashi Sakamoto * This function must not be called before the stream has been configured 311d67c46b9STakashi Sakamoto * with amdtp_stream_set_parameters(). 312d67c46b9STakashi Sakamoto */ 313d67c46b9STakashi Sakamoto unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) 314d67c46b9STakashi Sakamoto { 315d67c46b9STakashi Sakamoto unsigned int multiplier = 1; 31607ea238cSTakashi Sakamoto unsigned int cip_header_size = 0; 317d67c46b9STakashi Sakamoto 318d67c46b9STakashi Sakamoto if (s->flags & CIP_JUMBO_PAYLOAD) 319d67c46b9STakashi Sakamoto multiplier = 5; 3203b196c39STakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) 32107ea238cSTakashi Sakamoto cip_header_size = sizeof(__be32) * 2; 322d67c46b9STakashi Sakamoto 32307ea238cSTakashi Sakamoto return cip_header_size + 32407ea238cSTakashi Sakamoto s->syt_interval * s->data_block_quadlets * sizeof(__be32) * multiplier; 325d67c46b9STakashi Sakamoto } 326d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_get_max_payload); 327d67c46b9STakashi Sakamoto 328d67c46b9STakashi Sakamoto /** 329d67c46b9STakashi Sakamoto * amdtp_stream_pcm_prepare - prepare PCM device for running 330d67c46b9STakashi Sakamoto * @s: the AMDTP stream 331d67c46b9STakashi Sakamoto * 332d67c46b9STakashi Sakamoto * This function should be called from the PCM device's .prepare callback. 333d67c46b9STakashi Sakamoto */ 334d67c46b9STakashi Sakamoto void amdtp_stream_pcm_prepare(struct amdtp_stream *s) 335d67c46b9STakashi Sakamoto { 336d67c46b9STakashi Sakamoto tasklet_kill(&s->period_tasklet); 337d67c46b9STakashi Sakamoto s->pcm_buffer_pointer = 0; 338d67c46b9STakashi Sakamoto s->pcm_period_pointer = 0; 339d67c46b9STakashi Sakamoto } 340d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_pcm_prepare); 341d67c46b9STakashi Sakamoto 342*274fc355STakashi Sakamoto static unsigned int calculate_data_blocks(unsigned int *data_block_state, 343*274fc355STakashi Sakamoto bool is_blocking, bool is_no_info, 344*274fc355STakashi Sakamoto unsigned int syt_interval, enum cip_sfc sfc) 345d67c46b9STakashi Sakamoto { 346*274fc355STakashi Sakamoto unsigned int data_blocks; 347d67c46b9STakashi Sakamoto 348d67c46b9STakashi Sakamoto /* Blocking mode. */ 349*274fc355STakashi Sakamoto if (is_blocking) { 350d67c46b9STakashi Sakamoto /* This module generate empty packet for 'no data'. */ 351*274fc355STakashi Sakamoto if (is_no_info) 352d67c46b9STakashi Sakamoto data_blocks = 0; 353d67c46b9STakashi Sakamoto else 354*274fc355STakashi Sakamoto data_blocks = syt_interval; 355d67c46b9STakashi Sakamoto /* Non-blocking mode. */ 356d67c46b9STakashi Sakamoto } else { 357*274fc355STakashi Sakamoto if (!cip_sfc_is_base_44100(sfc)) { 358d3d10a4aSTakashi Sakamoto // Sample_rate / 8000 is an integer, and precomputed. 359*274fc355STakashi Sakamoto data_blocks = *data_block_state; 360d67c46b9STakashi Sakamoto } else { 361*274fc355STakashi Sakamoto unsigned int phase = *data_block_state; 362d67c46b9STakashi Sakamoto 363d67c46b9STakashi Sakamoto /* 364d67c46b9STakashi Sakamoto * This calculates the number of data blocks per packet so that 365d67c46b9STakashi Sakamoto * 1) the overall rate is correct and exactly synchronized to 366d67c46b9STakashi Sakamoto * the bus clock, and 367d67c46b9STakashi Sakamoto * 2) packets with a rounded-up number of blocks occur as early 368d67c46b9STakashi Sakamoto * as possible in the sequence (to prevent underruns of the 369d67c46b9STakashi Sakamoto * device's buffer). 370d67c46b9STakashi Sakamoto */ 371*274fc355STakashi Sakamoto if (sfc == CIP_SFC_44100) 372d67c46b9STakashi Sakamoto /* 6 6 5 6 5 6 5 ... */ 373d67c46b9STakashi Sakamoto data_blocks = 5 + ((phase & 1) ^ 374d67c46b9STakashi Sakamoto (phase == 0 || phase >= 40)); 375d67c46b9STakashi Sakamoto else 376d67c46b9STakashi Sakamoto /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ 377*274fc355STakashi Sakamoto data_blocks = 11 * (sfc >> 1) + (phase == 0); 378*274fc355STakashi Sakamoto if (++phase >= (80 >> (sfc >> 1))) 379d67c46b9STakashi Sakamoto phase = 0; 380*274fc355STakashi Sakamoto *data_block_state = phase; 381d67c46b9STakashi Sakamoto } 382d67c46b9STakashi Sakamoto } 383d67c46b9STakashi Sakamoto 384d67c46b9STakashi Sakamoto return data_blocks; 385d67c46b9STakashi Sakamoto } 386d67c46b9STakashi Sakamoto 387816d8482STakashi Sakamoto static unsigned int calculate_syt_offset(unsigned int *last_syt_offset, 388816d8482STakashi Sakamoto unsigned int *syt_offset_state, enum cip_sfc sfc) 389d67c46b9STakashi Sakamoto { 390816d8482STakashi Sakamoto unsigned int syt_offset; 391d67c46b9STakashi Sakamoto 392816d8482STakashi Sakamoto if (*last_syt_offset < TICKS_PER_CYCLE) { 393816d8482STakashi Sakamoto if (!cip_sfc_is_base_44100(sfc)) 394816d8482STakashi Sakamoto syt_offset = *last_syt_offset + *syt_offset_state; 395d67c46b9STakashi Sakamoto else { 396d67c46b9STakashi Sakamoto /* 397d67c46b9STakashi Sakamoto * The time, in ticks, of the n'th SYT_INTERVAL sample is: 398d67c46b9STakashi Sakamoto * n * SYT_INTERVAL * 24576000 / sample_rate 399d67c46b9STakashi Sakamoto * Modulo TICKS_PER_CYCLE, the difference between successive 400d67c46b9STakashi Sakamoto * elements is about 1386.23. Rounding the results of this 401d67c46b9STakashi Sakamoto * formula to the SYT precision results in a sequence of 402d67c46b9STakashi Sakamoto * differences that begins with: 403d67c46b9STakashi Sakamoto * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... 404d67c46b9STakashi Sakamoto * This code generates _exactly_ the same sequence. 405d67c46b9STakashi Sakamoto */ 406816d8482STakashi Sakamoto unsigned int phase = *syt_offset_state; 407816d8482STakashi Sakamoto unsigned int index = phase % 13; 408816d8482STakashi Sakamoto 409816d8482STakashi Sakamoto syt_offset = *last_syt_offset; 410d67c46b9STakashi Sakamoto syt_offset += 1386 + ((index && !(index & 3)) || 411d67c46b9STakashi Sakamoto phase == 146); 412d67c46b9STakashi Sakamoto if (++phase >= 147) 413d67c46b9STakashi Sakamoto phase = 0; 414816d8482STakashi Sakamoto *syt_offset_state = phase; 415d67c46b9STakashi Sakamoto } 416d67c46b9STakashi Sakamoto } else 417816d8482STakashi Sakamoto syt_offset = *last_syt_offset - TICKS_PER_CYCLE; 418816d8482STakashi Sakamoto *last_syt_offset = syt_offset; 419d67c46b9STakashi Sakamoto 42083cfb5c5STakashi Sakamoto if (syt_offset >= TICKS_PER_CYCLE) 42183cfb5c5STakashi Sakamoto syt_offset = CIP_SYT_NO_INFO; 422d67c46b9STakashi Sakamoto 42383cfb5c5STakashi Sakamoto return syt_offset; 424d67c46b9STakashi Sakamoto } 425d67c46b9STakashi Sakamoto 426d67c46b9STakashi Sakamoto static void update_pcm_pointers(struct amdtp_stream *s, 427d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm, 428d67c46b9STakashi Sakamoto unsigned int frames) 429d67c46b9STakashi Sakamoto { 430d67c46b9STakashi Sakamoto unsigned int ptr; 431d67c46b9STakashi Sakamoto 432d67c46b9STakashi Sakamoto ptr = s->pcm_buffer_pointer + frames; 433d67c46b9STakashi Sakamoto if (ptr >= pcm->runtime->buffer_size) 434d67c46b9STakashi Sakamoto ptr -= pcm->runtime->buffer_size; 4356aa7de05SMark Rutland WRITE_ONCE(s->pcm_buffer_pointer, ptr); 436d67c46b9STakashi Sakamoto 437d67c46b9STakashi Sakamoto s->pcm_period_pointer += frames; 438d67c46b9STakashi Sakamoto if (s->pcm_period_pointer >= pcm->runtime->period_size) { 439d67c46b9STakashi Sakamoto s->pcm_period_pointer -= pcm->runtime->period_size; 440d67c46b9STakashi Sakamoto tasklet_hi_schedule(&s->period_tasklet); 441d67c46b9STakashi Sakamoto } 442d67c46b9STakashi Sakamoto } 443d67c46b9STakashi Sakamoto 444d67c46b9STakashi Sakamoto static void pcm_period_tasklet(unsigned long data) 445d67c46b9STakashi Sakamoto { 446d67c46b9STakashi Sakamoto struct amdtp_stream *s = (void *)data; 4476aa7de05SMark Rutland struct snd_pcm_substream *pcm = READ_ONCE(s->pcm); 448d67c46b9STakashi Sakamoto 449d67c46b9STakashi Sakamoto if (pcm) 450d67c46b9STakashi Sakamoto snd_pcm_period_elapsed(pcm); 451d67c46b9STakashi Sakamoto } 452d67c46b9STakashi Sakamoto 453e229853dSTakashi Sakamoto static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params, 454e229853dSTakashi Sakamoto bool sched_irq) 455d67c46b9STakashi Sakamoto { 4566007bf54STakashi Sakamoto int err; 457d67c46b9STakashi Sakamoto 458e229853dSTakashi Sakamoto params->interrupt = sched_irq; 4596007bf54STakashi Sakamoto params->tag = s->tag; 4606007bf54STakashi Sakamoto params->sy = 0; 461d67c46b9STakashi Sakamoto 4626007bf54STakashi Sakamoto err = fw_iso_context_queue(s->context, params, &s->buffer.iso_buffer, 463d67c46b9STakashi Sakamoto s->buffer.packets[s->packet_index].offset); 464d67c46b9STakashi Sakamoto if (err < 0) { 465d67c46b9STakashi Sakamoto dev_err(&s->unit->device, "queueing error: %d\n", err); 466d67c46b9STakashi Sakamoto goto end; 467d67c46b9STakashi Sakamoto } 468d67c46b9STakashi Sakamoto 469a0e02331STakashi Sakamoto if (++s->packet_index >= s->queue_size) 470d67c46b9STakashi Sakamoto s->packet_index = 0; 471d67c46b9STakashi Sakamoto end: 472d67c46b9STakashi Sakamoto return err; 473d67c46b9STakashi Sakamoto } 474d67c46b9STakashi Sakamoto 475d67c46b9STakashi Sakamoto static inline int queue_out_packet(struct amdtp_stream *s, 476e229853dSTakashi Sakamoto struct fw_iso_packet *params, bool sched_irq) 477d67c46b9STakashi Sakamoto { 478b18f0cfaSTakashi Sakamoto params->skip = 479b18f0cfaSTakashi Sakamoto !!(params->header_length == 0 && params->payload_length == 0); 480e229853dSTakashi Sakamoto return queue_packet(s, params, sched_irq); 481d67c46b9STakashi Sakamoto } 482d67c46b9STakashi Sakamoto 4836007bf54STakashi Sakamoto static inline int queue_in_packet(struct amdtp_stream *s, 48460dd4929STakashi Sakamoto struct fw_iso_packet *params) 485d67c46b9STakashi Sakamoto { 4866007bf54STakashi Sakamoto // Queue one packet for IR context. 4876007bf54STakashi Sakamoto params->header_length = s->ctx_data.tx.ctx_header_size; 4886007bf54STakashi Sakamoto params->payload_length = s->ctx_data.tx.max_ctx_payload_length; 4896007bf54STakashi Sakamoto params->skip = false; 49060dd4929STakashi Sakamoto return queue_packet(s, params, false); 491d67c46b9STakashi Sakamoto } 492d67c46b9STakashi Sakamoto 493252219c7STakashi Sakamoto static void generate_cip_header(struct amdtp_stream *s, __be32 cip_header[2], 494860d798cSTakashi Sakamoto unsigned int data_block_counter, unsigned int syt) 495252219c7STakashi Sakamoto { 496252219c7STakashi Sakamoto cip_header[0] = cpu_to_be32(READ_ONCE(s->source_node_id_field) | 497252219c7STakashi Sakamoto (s->data_block_quadlets << CIP_DBS_SHIFT) | 498252219c7STakashi Sakamoto ((s->sph << CIP_SPH_SHIFT) & CIP_SPH_MASK) | 499860d798cSTakashi Sakamoto data_block_counter); 500252219c7STakashi Sakamoto cip_header[1] = cpu_to_be32(CIP_EOH | 501252219c7STakashi Sakamoto ((s->fmt << CIP_FMT_SHIFT) & CIP_FMT_MASK) | 502252219c7STakashi Sakamoto ((s->ctx_data.rx.fdf << CIP_FDF_SHIFT) & CIP_FDF_MASK) | 503252219c7STakashi Sakamoto (syt & CIP_SYT_MASK)); 504252219c7STakashi Sakamoto } 505252219c7STakashi Sakamoto 5066bc1a269STakashi Sakamoto static void build_it_pkt_header(struct amdtp_stream *s, unsigned int cycle, 5076bc1a269STakashi Sakamoto struct fw_iso_packet *params, 508860d798cSTakashi Sakamoto unsigned int data_blocks, 509860d798cSTakashi Sakamoto unsigned int data_block_counter, 510860d798cSTakashi Sakamoto unsigned int syt, unsigned int index) 511d67c46b9STakashi Sakamoto { 5120ebf3cebSTakashi Sakamoto unsigned int payload_length; 51316be4589STakashi Sakamoto __be32 *cip_header; 514d67c46b9STakashi Sakamoto 5150ebf3cebSTakashi Sakamoto payload_length = data_blocks * sizeof(__be32) * s->data_block_quadlets; 5160ebf3cebSTakashi Sakamoto params->payload_length = payload_length; 5170ebf3cebSTakashi Sakamoto 518b18f0cfaSTakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) { 5196bc1a269STakashi Sakamoto cip_header = (__be32 *)params->header; 520860d798cSTakashi Sakamoto generate_cip_header(s, cip_header, data_block_counter, syt); 5216bc1a269STakashi Sakamoto params->header_length = 2 * sizeof(__be32); 5220ebf3cebSTakashi Sakamoto payload_length += params->header_length; 523b18f0cfaSTakashi Sakamoto } else { 524b18f0cfaSTakashi Sakamoto cip_header = NULL; 525b18f0cfaSTakashi Sakamoto } 526d67c46b9STakashi Sakamoto 527213fa989STakashi Sakamoto trace_amdtp_packet(s, cycle, cip_header, payload_length, data_blocks, 528860d798cSTakashi Sakamoto data_block_counter, index); 5293b196c39STakashi Sakamoto } 5303b196c39STakashi Sakamoto 531e335425bSTakashi Sakamoto static int check_cip_header(struct amdtp_stream *s, const __be32 *buf, 532e335425bSTakashi Sakamoto unsigned int payload_length, 533a35463d1STakashi Sakamoto unsigned int *data_blocks, 534a35463d1STakashi Sakamoto unsigned int *data_block_counter, unsigned int *syt) 535d67c46b9STakashi Sakamoto { 536d67c46b9STakashi Sakamoto u32 cip_header[2]; 537e335425bSTakashi Sakamoto unsigned int sph; 538e335425bSTakashi Sakamoto unsigned int fmt; 539e335425bSTakashi Sakamoto unsigned int fdf; 540a35463d1STakashi Sakamoto unsigned int dbc; 541d67c46b9STakashi Sakamoto bool lost; 542d67c46b9STakashi Sakamoto 543e335425bSTakashi Sakamoto cip_header[0] = be32_to_cpu(buf[0]); 544e335425bSTakashi Sakamoto cip_header[1] = be32_to_cpu(buf[1]); 545d67c46b9STakashi Sakamoto 546d67c46b9STakashi Sakamoto /* 547d67c46b9STakashi Sakamoto * This module supports 'Two-quadlet CIP header with SYT field'. 548d67c46b9STakashi Sakamoto * For convenience, also check FMT field is AM824 or not. 549d67c46b9STakashi Sakamoto */ 5502128f78fSTakashi Sakamoto if ((((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || 5512128f78fSTakashi Sakamoto ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH)) && 5522128f78fSTakashi Sakamoto (!(s->flags & CIP_HEADER_WITHOUT_EOH))) { 553d67c46b9STakashi Sakamoto dev_info_ratelimited(&s->unit->device, 554d67c46b9STakashi Sakamoto "Invalid CIP header for AMDTP: %08X:%08X\n", 555d67c46b9STakashi Sakamoto cip_header[0], cip_header[1]); 556e335425bSTakashi Sakamoto return -EAGAIN; 557d67c46b9STakashi Sakamoto } 558d67c46b9STakashi Sakamoto 559d67c46b9STakashi Sakamoto /* Check valid protocol or not. */ 5609863874fSTakashi Sakamoto sph = (cip_header[0] & CIP_SPH_MASK) >> CIP_SPH_SHIFT; 561d67c46b9STakashi Sakamoto fmt = (cip_header[1] & CIP_FMT_MASK) >> CIP_FMT_SHIFT; 5629863874fSTakashi Sakamoto if (sph != s->sph || fmt != s->fmt) { 5632a7e1713STakashi Sakamoto dev_info_ratelimited(&s->unit->device, 564d67c46b9STakashi Sakamoto "Detect unexpected protocol: %08x %08x\n", 565d67c46b9STakashi Sakamoto cip_header[0], cip_header[1]); 566e335425bSTakashi Sakamoto return -EAGAIN; 567d67c46b9STakashi Sakamoto } 568d67c46b9STakashi Sakamoto 569d67c46b9STakashi Sakamoto /* Calculate data blocks */ 570d67c46b9STakashi Sakamoto fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT; 571e335425bSTakashi Sakamoto if (payload_length < sizeof(__be32) * 2 || 572d67c46b9STakashi Sakamoto (fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) { 573e335425bSTakashi Sakamoto *data_blocks = 0; 574d67c46b9STakashi Sakamoto } else { 575e335425bSTakashi Sakamoto unsigned int data_block_quadlets = 576d67c46b9STakashi Sakamoto (cip_header[0] & CIP_DBS_MASK) >> CIP_DBS_SHIFT; 577d67c46b9STakashi Sakamoto /* avoid division by zero */ 578d67c46b9STakashi Sakamoto if (data_block_quadlets == 0) { 579d67c46b9STakashi Sakamoto dev_err(&s->unit->device, 580d67c46b9STakashi Sakamoto "Detect invalid value in dbs field: %08X\n", 581d67c46b9STakashi Sakamoto cip_header[0]); 582d67c46b9STakashi Sakamoto return -EPROTO; 583d67c46b9STakashi Sakamoto } 584d67c46b9STakashi Sakamoto if (s->flags & CIP_WRONG_DBS) 585d67c46b9STakashi Sakamoto data_block_quadlets = s->data_block_quadlets; 586d67c46b9STakashi Sakamoto 587e335425bSTakashi Sakamoto *data_blocks = (payload_length / sizeof(__be32) - 2) / 588ff0fb5aaSTakashi Sakamoto data_block_quadlets; 589d67c46b9STakashi Sakamoto } 590d67c46b9STakashi Sakamoto 591d67c46b9STakashi Sakamoto /* Check data block counter continuity */ 592a35463d1STakashi Sakamoto dbc = cip_header[0] & CIP_DBC_MASK; 593e335425bSTakashi Sakamoto if (*data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && 594a35463d1STakashi Sakamoto *data_block_counter != UINT_MAX) 595a35463d1STakashi Sakamoto dbc = *data_block_counter; 596d67c46b9STakashi Sakamoto 597a35463d1STakashi Sakamoto if ((dbc == 0x00 && (s->flags & CIP_SKIP_DBC_ZERO_CHECK)) || 598a35463d1STakashi Sakamoto *data_block_counter == UINT_MAX) { 599d67c46b9STakashi Sakamoto lost = false; 600d67c46b9STakashi Sakamoto } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { 601a35463d1STakashi Sakamoto lost = dbc != *data_block_counter; 602d67c46b9STakashi Sakamoto } else { 603e335425bSTakashi Sakamoto unsigned int dbc_interval; 604e335425bSTakashi Sakamoto 605e335425bSTakashi Sakamoto if (*data_blocks > 0 && s->ctx_data.tx.dbc_interval > 0) 606d3d10a4aSTakashi Sakamoto dbc_interval = s->ctx_data.tx.dbc_interval; 607d67c46b9STakashi Sakamoto else 608e335425bSTakashi Sakamoto dbc_interval = *data_blocks; 609d67c46b9STakashi Sakamoto 610a35463d1STakashi Sakamoto lost = dbc != ((*data_block_counter + dbc_interval) & 0xff); 611d67c46b9STakashi Sakamoto } 612d67c46b9STakashi Sakamoto 613d67c46b9STakashi Sakamoto if (lost) { 614d67c46b9STakashi Sakamoto dev_err(&s->unit->device, 615d67c46b9STakashi Sakamoto "Detect discontinuity of CIP: %02X %02X\n", 616a35463d1STakashi Sakamoto *data_block_counter, dbc); 617d67c46b9STakashi Sakamoto return -EIO; 618d67c46b9STakashi Sakamoto } 619d67c46b9STakashi Sakamoto 620753e7179STakashi Sakamoto *data_block_counter = dbc; 621753e7179STakashi Sakamoto 622e335425bSTakashi Sakamoto *syt = cip_header[1] & CIP_SYT_MASK; 623e335425bSTakashi Sakamoto 624e335425bSTakashi Sakamoto return 0; 625e335425bSTakashi Sakamoto } 626e335425bSTakashi Sakamoto 62798e3e43bSTakashi Sakamoto static int parse_ir_ctx_header(struct amdtp_stream *s, unsigned int cycle, 62898e3e43bSTakashi Sakamoto const __be32 *ctx_header, 62998e3e43bSTakashi Sakamoto unsigned int *payload_length, 630a35463d1STakashi Sakamoto unsigned int *data_blocks, 631a35463d1STakashi Sakamoto unsigned int *data_block_counter, 632a35463d1STakashi Sakamoto unsigned int *syt, unsigned int index) 633e335425bSTakashi Sakamoto { 634f11453c7STakashi Sakamoto const __be32 *cip_header; 635e335425bSTakashi Sakamoto int err; 636e335425bSTakashi Sakamoto 63798e3e43bSTakashi Sakamoto *payload_length = be32_to_cpu(ctx_header[0]) >> ISO_DATA_LENGTH_SHIFT; 63898e3e43bSTakashi Sakamoto if (*payload_length > s->ctx_data.tx.ctx_header_size + 639f11453c7STakashi Sakamoto s->ctx_data.tx.max_ctx_payload_length) { 640e335425bSTakashi Sakamoto dev_err(&s->unit->device, 641e335425bSTakashi Sakamoto "Detect jumbo payload: %04x %04x\n", 64298e3e43bSTakashi Sakamoto *payload_length, s->ctx_data.tx.max_ctx_payload_length); 643e335425bSTakashi Sakamoto return -EIO; 644e335425bSTakashi Sakamoto } 645e335425bSTakashi Sakamoto 646947b437eSTakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) { 64798e3e43bSTakashi Sakamoto cip_header = ctx_header + 2; 64898e3e43bSTakashi Sakamoto err = check_cip_header(s, cip_header, *payload_length, 649a35463d1STakashi Sakamoto data_blocks, data_block_counter, syt); 650b8b0e24cSTakashi Sakamoto if (err < 0) 651e335425bSTakashi Sakamoto return err; 652947b437eSTakashi Sakamoto } else { 653947b437eSTakashi Sakamoto cip_header = NULL; 65476864868STakashi Sakamoto err = 0; 65598e3e43bSTakashi Sakamoto *data_blocks = *payload_length / sizeof(__be32) / 65698e3e43bSTakashi Sakamoto s->data_block_quadlets; 65798e3e43bSTakashi Sakamoto *syt = 0; 6587fbf9096STakashi Sakamoto 659a35463d1STakashi Sakamoto if (*data_block_counter == UINT_MAX) 660a35463d1STakashi Sakamoto *data_block_counter = 0; 661947b437eSTakashi Sakamoto } 662e335425bSTakashi Sakamoto 66398e3e43bSTakashi Sakamoto trace_amdtp_packet(s, cycle, cip_header, *payload_length, *data_blocks, 664a35463d1STakashi Sakamoto *data_block_counter, index); 66564d0bf4dSTakashi Sakamoto 66676864868STakashi Sakamoto return err; 667d67c46b9STakashi Sakamoto } 668d67c46b9STakashi Sakamoto 66926cd1e58STakashi Sakamoto // In CYCLE_TIMER register of IEEE 1394, 7 bits are used to represent second. On 67026cd1e58STakashi Sakamoto // the other hand, in DMA descriptors of 1394 OHCI, 3 bits are used to represent 67126cd1e58STakashi Sakamoto // it. Thus, via Linux firewire subsystem, we can get the 3 bits for second. 67226cd1e58STakashi Sakamoto static inline u32 compute_cycle_count(__be32 ctx_header_tstamp) 67373fc7f08STakashi Sakamoto { 67426cd1e58STakashi Sakamoto u32 tstamp = be32_to_cpu(ctx_header_tstamp) & HEADER_TSTAMP_MASK; 67573fc7f08STakashi Sakamoto return (((tstamp >> 13) & 0x07) * 8000) + (tstamp & 0x1fff); 67673fc7f08STakashi Sakamoto } 67773fc7f08STakashi Sakamoto 67873fc7f08STakashi Sakamoto static inline u32 increment_cycle_count(u32 cycle, unsigned int addend) 67973fc7f08STakashi Sakamoto { 68073fc7f08STakashi Sakamoto cycle += addend; 68110aa8e4aSTakashi Sakamoto if (cycle >= OHCI_MAX_SECOND * CYCLES_PER_SECOND) 68210aa8e4aSTakashi Sakamoto cycle -= OHCI_MAX_SECOND * CYCLES_PER_SECOND; 68373fc7f08STakashi Sakamoto return cycle; 68473fc7f08STakashi Sakamoto } 68573fc7f08STakashi Sakamoto 68626cd1e58STakashi Sakamoto // Align to actual cycle count for the packet which is going to be scheduled. 687a0e02331STakashi Sakamoto // This module queued the same number of isochronous cycle as the size of queue 688a0e02331STakashi Sakamoto // to kip isochronous cycle, therefore it's OK to just increment the cycle by 689a0e02331STakashi Sakamoto // the size of queue for scheduled cycle. 690a0e02331STakashi Sakamoto static inline u32 compute_it_cycle(const __be32 ctx_header_tstamp, 691a0e02331STakashi Sakamoto unsigned int queue_size) 69226cd1e58STakashi Sakamoto { 69326cd1e58STakashi Sakamoto u32 cycle = compute_cycle_count(ctx_header_tstamp); 694a0e02331STakashi Sakamoto return increment_cycle_count(cycle, queue_size); 69526cd1e58STakashi Sakamoto } 69626cd1e58STakashi Sakamoto 697753e7179STakashi Sakamoto static int generate_device_pkt_descs(struct amdtp_stream *s, 698753e7179STakashi Sakamoto struct pkt_desc *descs, 699753e7179STakashi Sakamoto const __be32 *ctx_header, 700753e7179STakashi Sakamoto unsigned int packets) 701753e7179STakashi Sakamoto { 702753e7179STakashi Sakamoto unsigned int dbc = s->data_block_counter; 703753e7179STakashi Sakamoto int i; 704753e7179STakashi Sakamoto int err; 705753e7179STakashi Sakamoto 706753e7179STakashi Sakamoto for (i = 0; i < packets; ++i) { 707753e7179STakashi Sakamoto struct pkt_desc *desc = descs + i; 708a0e02331STakashi Sakamoto unsigned int index = (s->packet_index + i) % s->queue_size; 709753e7179STakashi Sakamoto unsigned int cycle; 710753e7179STakashi Sakamoto unsigned int payload_length; 711753e7179STakashi Sakamoto unsigned int data_blocks; 712753e7179STakashi Sakamoto unsigned int syt; 713753e7179STakashi Sakamoto 714753e7179STakashi Sakamoto cycle = compute_cycle_count(ctx_header[1]); 715753e7179STakashi Sakamoto 716753e7179STakashi Sakamoto err = parse_ir_ctx_header(s, cycle, ctx_header, &payload_length, 717753e7179STakashi Sakamoto &data_blocks, &dbc, &syt, i); 718753e7179STakashi Sakamoto if (err < 0) 719753e7179STakashi Sakamoto return err; 720753e7179STakashi Sakamoto 721753e7179STakashi Sakamoto desc->cycle = cycle; 722753e7179STakashi Sakamoto desc->syt = syt; 723753e7179STakashi Sakamoto desc->data_blocks = data_blocks; 724753e7179STakashi Sakamoto desc->data_block_counter = dbc; 725753e7179STakashi Sakamoto desc->ctx_payload = s->buffer.packets[index].buffer; 726753e7179STakashi Sakamoto 727753e7179STakashi Sakamoto if (!(s->flags & CIP_DBC_IS_END_EVENT)) 728753e7179STakashi Sakamoto dbc = (dbc + desc->data_blocks) & 0xff; 729753e7179STakashi Sakamoto 730753e7179STakashi Sakamoto ctx_header += 731753e7179STakashi Sakamoto s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header); 732753e7179STakashi Sakamoto } 733753e7179STakashi Sakamoto 734753e7179STakashi Sakamoto s->data_block_counter = dbc; 735753e7179STakashi Sakamoto 736753e7179STakashi Sakamoto return 0; 737753e7179STakashi Sakamoto } 738753e7179STakashi Sakamoto 73983cfb5c5STakashi Sakamoto static unsigned int compute_syt(unsigned int syt_offset, unsigned int cycle, 74083cfb5c5STakashi Sakamoto unsigned int transfer_delay) 74183cfb5c5STakashi Sakamoto { 74283cfb5c5STakashi Sakamoto unsigned int syt; 74383cfb5c5STakashi Sakamoto 74483cfb5c5STakashi Sakamoto syt_offset += transfer_delay; 74583cfb5c5STakashi Sakamoto syt = ((cycle + syt_offset / TICKS_PER_CYCLE) << 12) | 74683cfb5c5STakashi Sakamoto (syt_offset % TICKS_PER_CYCLE); 74783cfb5c5STakashi Sakamoto return syt & CIP_SYT_MASK; 74883cfb5c5STakashi Sakamoto } 74983cfb5c5STakashi Sakamoto 750f4f6ae7bSTakashi Sakamoto static void generate_ideal_pkt_descs(struct amdtp_stream *s, 751f4f6ae7bSTakashi Sakamoto struct pkt_desc *descs, 752f4f6ae7bSTakashi Sakamoto const __be32 *ctx_header, 753f4f6ae7bSTakashi Sakamoto unsigned int packets) 754f4f6ae7bSTakashi Sakamoto { 755f4f6ae7bSTakashi Sakamoto unsigned int dbc = s->data_block_counter; 756f4f6ae7bSTakashi Sakamoto int i; 757f4f6ae7bSTakashi Sakamoto 758f4f6ae7bSTakashi Sakamoto for (i = 0; i < packets; ++i) { 759f4f6ae7bSTakashi Sakamoto struct pkt_desc *desc = descs + i; 760a0e02331STakashi Sakamoto unsigned int index = (s->packet_index + i) % s->queue_size; 76183cfb5c5STakashi Sakamoto unsigned int syt_offset; 762f4f6ae7bSTakashi Sakamoto 763a0e02331STakashi Sakamoto desc->cycle = compute_it_cycle(*ctx_header, s->queue_size); 764816d8482STakashi Sakamoto syt_offset = calculate_syt_offset( 765816d8482STakashi Sakamoto &s->ctx_data.rx.last_syt_offset, 766816d8482STakashi Sakamoto &s->ctx_data.rx.syt_offset_state, s->sfc); 76783cfb5c5STakashi Sakamoto if (syt_offset != CIP_SYT_NO_INFO) { 76883cfb5c5STakashi Sakamoto desc->syt = compute_syt(syt_offset, desc->cycle, 76983cfb5c5STakashi Sakamoto s->ctx_data.rx.transfer_delay); 77083cfb5c5STakashi Sakamoto } else { 77183cfb5c5STakashi Sakamoto desc->syt = syt_offset; 77283cfb5c5STakashi Sakamoto } 773*274fc355STakashi Sakamoto desc->data_blocks = 774*274fc355STakashi Sakamoto calculate_data_blocks(&s->ctx_data.rx.data_block_state, 775*274fc355STakashi Sakamoto !!(s->flags & CIP_BLOCKING), 776*274fc355STakashi Sakamoto desc->syt == CIP_SYT_NO_INFO, 777*274fc355STakashi Sakamoto s->syt_interval, s->sfc); 778f4f6ae7bSTakashi Sakamoto 779f4f6ae7bSTakashi Sakamoto if (s->flags & CIP_DBC_IS_END_EVENT) 780f4f6ae7bSTakashi Sakamoto dbc = (dbc + desc->data_blocks) & 0xff; 781f4f6ae7bSTakashi Sakamoto 782f4f6ae7bSTakashi Sakamoto desc->data_block_counter = dbc; 783f4f6ae7bSTakashi Sakamoto 784f4f6ae7bSTakashi Sakamoto if (!(s->flags & CIP_DBC_IS_END_EVENT)) 785f4f6ae7bSTakashi Sakamoto dbc = (dbc + desc->data_blocks) & 0xff; 786f4f6ae7bSTakashi Sakamoto 787f4f6ae7bSTakashi Sakamoto desc->ctx_payload = s->buffer.packets[index].buffer; 788f4f6ae7bSTakashi Sakamoto 789f4f6ae7bSTakashi Sakamoto ++ctx_header; 790f4f6ae7bSTakashi Sakamoto } 791f4f6ae7bSTakashi Sakamoto 792f4f6ae7bSTakashi Sakamoto s->data_block_counter = dbc; 793f4f6ae7bSTakashi Sakamoto } 794f4f6ae7bSTakashi Sakamoto 795fce9b013STakashi Sakamoto static inline void cancel_stream(struct amdtp_stream *s) 796fce9b013STakashi Sakamoto { 797fce9b013STakashi Sakamoto s->packet_index = -1; 798fce9b013STakashi Sakamoto if (in_interrupt()) 799fce9b013STakashi Sakamoto amdtp_stream_pcm_abort(s); 800fce9b013STakashi Sakamoto WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN); 801fce9b013STakashi Sakamoto } 802fce9b013STakashi Sakamoto 8030f5cfcb2STakashi Sakamoto static void process_ctx_payloads(struct amdtp_stream *s, 8040f5cfcb2STakashi Sakamoto const struct pkt_desc *descs, 8050f5cfcb2STakashi Sakamoto unsigned int packets) 8060f5cfcb2STakashi Sakamoto { 8079a738ad1STakashi Sakamoto struct snd_pcm_substream *pcm; 8080f5cfcb2STakashi Sakamoto unsigned int pcm_frames; 8090f5cfcb2STakashi Sakamoto 8109a738ad1STakashi Sakamoto pcm = READ_ONCE(s->pcm); 8119a738ad1STakashi Sakamoto pcm_frames = s->process_ctx_payloads(s, descs, packets, pcm); 8129a738ad1STakashi Sakamoto if (pcm) 8130f5cfcb2STakashi Sakamoto update_pcm_pointers(s, pcm, pcm_frames); 8140f5cfcb2STakashi Sakamoto } 8150f5cfcb2STakashi Sakamoto 81673fc7f08STakashi Sakamoto static void out_stream_callback(struct fw_iso_context *context, u32 tstamp, 817d67c46b9STakashi Sakamoto size_t header_length, void *header, 818d67c46b9STakashi Sakamoto void *private_data) 819d67c46b9STakashi Sakamoto { 820d67c46b9STakashi Sakamoto struct amdtp_stream *s = private_data; 82126cd1e58STakashi Sakamoto const __be32 *ctx_header = header; 82260dd4929STakashi Sakamoto unsigned int events_per_period = s->ctx_data.rx.events_per_period; 82360dd4929STakashi Sakamoto unsigned int event_count = s->ctx_data.rx.event_count; 824a0e02331STakashi Sakamoto unsigned int packets; 8250dcb4efbSTakashi Sakamoto int i; 826d67c46b9STakashi Sakamoto 827d67c46b9STakashi Sakamoto if (s->packet_index < 0) 828d67c46b9STakashi Sakamoto return; 829d67c46b9STakashi Sakamoto 830a0e02331STakashi Sakamoto // Calculate the number of packets in buffer and check XRUN. 831a0e02331STakashi Sakamoto packets = header_length / sizeof(*ctx_header); 832a0e02331STakashi Sakamoto 833f4f6ae7bSTakashi Sakamoto generate_ideal_pkt_descs(s, s->pkt_descs, ctx_header, packets); 834f4f6ae7bSTakashi Sakamoto 8350f5cfcb2STakashi Sakamoto process_ctx_payloads(s, s->pkt_descs, packets); 8365e2ece0fSTakashi Sakamoto 8375e2ece0fSTakashi Sakamoto for (i = 0; i < packets; ++i) { 8385e2ece0fSTakashi Sakamoto const struct pkt_desc *desc = s->pkt_descs + i; 839f4f6ae7bSTakashi Sakamoto unsigned int syt; 8406bc1a269STakashi Sakamoto struct { 8416bc1a269STakashi Sakamoto struct fw_iso_packet params; 8426bc1a269STakashi Sakamoto __be32 header[IT_PKT_HEADER_SIZE_CIP / sizeof(__be32)]; 8436bc1a269STakashi Sakamoto } template = { {0}, {0} }; 844e229853dSTakashi Sakamoto bool sched_irq = false; 845860d798cSTakashi Sakamoto 846f4f6ae7bSTakashi Sakamoto if (s->ctx_data.rx.syt_override < 0) 847f4f6ae7bSTakashi Sakamoto syt = desc->syt; 848f4f6ae7bSTakashi Sakamoto else 8493baf3053STakashi Sakamoto syt = s->ctx_data.rx.syt_override; 8503baf3053STakashi Sakamoto 851f4f6ae7bSTakashi Sakamoto build_it_pkt_header(s, desc->cycle, &template.params, 852f4f6ae7bSTakashi Sakamoto desc->data_blocks, desc->data_block_counter, 853f4f6ae7bSTakashi Sakamoto syt, i); 8546bc1a269STakashi Sakamoto 8552472cfb3STakashi Sakamoto if (s == s->domain->irq_target) { 856e229853dSTakashi Sakamoto event_count += desc->data_blocks; 857e229853dSTakashi Sakamoto if (event_count >= events_per_period) { 858e229853dSTakashi Sakamoto event_count -= events_per_period; 859e229853dSTakashi Sakamoto sched_irq = true; 860e229853dSTakashi Sakamoto } 86160dd4929STakashi Sakamoto } 862e229853dSTakashi Sakamoto 863e229853dSTakashi Sakamoto if (queue_out_packet(s, &template.params, sched_irq) < 0) { 864fce9b013STakashi Sakamoto cancel_stream(s); 865d67c46b9STakashi Sakamoto return; 866d67c46b9STakashi Sakamoto } 867d67c46b9STakashi Sakamoto } 868d67c46b9STakashi Sakamoto 86960dd4929STakashi Sakamoto s->ctx_data.rx.event_count = event_count; 870d67c46b9STakashi Sakamoto } 871d67c46b9STakashi Sakamoto 87273fc7f08STakashi Sakamoto static void in_stream_callback(struct fw_iso_context *context, u32 tstamp, 873d67c46b9STakashi Sakamoto size_t header_length, void *header, 874d67c46b9STakashi Sakamoto void *private_data) 875d67c46b9STakashi Sakamoto { 876d67c46b9STakashi Sakamoto struct amdtp_stream *s = private_data; 877cc4f8e91STakashi Sakamoto __be32 *ctx_header = header; 878e229853dSTakashi Sakamoto unsigned int packets; 879753e7179STakashi Sakamoto int i; 880753e7179STakashi Sakamoto int err; 881d67c46b9STakashi Sakamoto 882d67c46b9STakashi Sakamoto if (s->packet_index < 0) 883d67c46b9STakashi Sakamoto return; 884d67c46b9STakashi Sakamoto 885a0e02331STakashi Sakamoto // Calculate the number of packets in buffer and check XRUN. 886d3d10a4aSTakashi Sakamoto packets = header_length / s->ctx_data.tx.ctx_header_size; 887f90e2dedSTakashi Sakamoto 888753e7179STakashi Sakamoto err = generate_device_pkt_descs(s, s->pkt_descs, ctx_header, packets); 889753e7179STakashi Sakamoto if (err < 0) { 890753e7179STakashi Sakamoto if (err != -EAGAIN) { 891753e7179STakashi Sakamoto cancel_stream(s); 892753e7179STakashi Sakamoto return; 893753e7179STakashi Sakamoto } 8945e2ece0fSTakashi Sakamoto } else { 8950f5cfcb2STakashi Sakamoto process_ctx_payloads(s, s->pkt_descs, packets); 8965e2ece0fSTakashi Sakamoto } 8975e2ece0fSTakashi Sakamoto 8985e2ece0fSTakashi Sakamoto for (i = 0; i < packets; ++i) { 8995e2ece0fSTakashi Sakamoto struct fw_iso_packet params = {0}; 900a35463d1STakashi Sakamoto 90160dd4929STakashi Sakamoto if (queue_in_packet(s, ¶ms) < 0) { 902753e7179STakashi Sakamoto cancel_stream(s); 903753e7179STakashi Sakamoto return; 904753e7179STakashi Sakamoto } 905d67c46b9STakashi Sakamoto } 906d67c46b9STakashi Sakamoto } 907d67c46b9STakashi Sakamoto 9082472cfb3STakashi Sakamoto static void irq_target_callback(struct fw_iso_context *context, u32 tstamp, 9092472cfb3STakashi Sakamoto size_t header_length, void *header, 9102472cfb3STakashi Sakamoto void *private_data) 91160dd4929STakashi Sakamoto { 9122472cfb3STakashi Sakamoto struct amdtp_stream *irq_target = private_data; 9132472cfb3STakashi Sakamoto struct amdtp_domain *d = irq_target->domain; 91460dd4929STakashi Sakamoto struct amdtp_stream *s; 91560dd4929STakashi Sakamoto 91660dd4929STakashi Sakamoto out_stream_callback(context, tstamp, header_length, header, irq_target); 91760dd4929STakashi Sakamoto if (amdtp_streaming_error(irq_target)) 91860dd4929STakashi Sakamoto goto error; 91960dd4929STakashi Sakamoto 92060dd4929STakashi Sakamoto list_for_each_entry(s, &d->streams, list) { 92160dd4929STakashi Sakamoto if (s != irq_target && amdtp_stream_running(s)) { 92260dd4929STakashi Sakamoto fw_iso_context_flush_completions(s->context); 92360dd4929STakashi Sakamoto if (amdtp_streaming_error(s)) 92460dd4929STakashi Sakamoto goto error; 92560dd4929STakashi Sakamoto } 92660dd4929STakashi Sakamoto } 92760dd4929STakashi Sakamoto 92860dd4929STakashi Sakamoto return; 92960dd4929STakashi Sakamoto error: 93060dd4929STakashi Sakamoto if (amdtp_stream_running(irq_target)) 93160dd4929STakashi Sakamoto cancel_stream(irq_target); 93260dd4929STakashi Sakamoto 93360dd4929STakashi Sakamoto list_for_each_entry(s, &d->streams, list) { 93460dd4929STakashi Sakamoto if (amdtp_stream_running(s)) 93560dd4929STakashi Sakamoto cancel_stream(s); 93660dd4929STakashi Sakamoto } 93760dd4929STakashi Sakamoto } 93860dd4929STakashi Sakamoto 93960dd4929STakashi Sakamoto // this is executed one time. 940d67c46b9STakashi Sakamoto static void amdtp_stream_first_callback(struct fw_iso_context *context, 94173fc7f08STakashi Sakamoto u32 tstamp, size_t header_length, 942d67c46b9STakashi Sakamoto void *header, void *private_data) 943d67c46b9STakashi Sakamoto { 944d67c46b9STakashi Sakamoto struct amdtp_stream *s = private_data; 94526cd1e58STakashi Sakamoto const __be32 *ctx_header = header; 946a04513f8STakashi Sakamoto u32 cycle; 947d67c46b9STakashi Sakamoto 948d67c46b9STakashi Sakamoto /* 949d67c46b9STakashi Sakamoto * For in-stream, first packet has come. 950d67c46b9STakashi Sakamoto * For out-stream, prepared to transmit first packet 951d67c46b9STakashi Sakamoto */ 952d67c46b9STakashi Sakamoto s->callbacked = true; 953d67c46b9STakashi Sakamoto wake_up(&s->callback_wait); 954d67c46b9STakashi Sakamoto 955cc4f8e91STakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 95626cd1e58STakashi Sakamoto cycle = compute_cycle_count(ctx_header[1]); 957a04513f8STakashi Sakamoto 958d67c46b9STakashi Sakamoto context->callback.sc = in_stream_callback; 959a04513f8STakashi Sakamoto } else { 960a0e02331STakashi Sakamoto cycle = compute_it_cycle(*ctx_header, s->queue_size); 96126cd1e58STakashi Sakamoto 9622472cfb3STakashi Sakamoto if (s == s->domain->irq_target) 9632472cfb3STakashi Sakamoto context->callback.sc = irq_target_callback; 9642472cfb3STakashi Sakamoto else 965d67c46b9STakashi Sakamoto context->callback.sc = out_stream_callback; 966a04513f8STakashi Sakamoto } 967a04513f8STakashi Sakamoto 968a04513f8STakashi Sakamoto s->start_cycle = cycle; 969d67c46b9STakashi Sakamoto 97073fc7f08STakashi Sakamoto context->callback.sc(context, tstamp, header_length, header, s); 971d67c46b9STakashi Sakamoto } 972d67c46b9STakashi Sakamoto 973d67c46b9STakashi Sakamoto /** 974d67c46b9STakashi Sakamoto * amdtp_stream_start - start transferring packets 975d67c46b9STakashi Sakamoto * @s: the AMDTP stream to start 976d67c46b9STakashi Sakamoto * @channel: the isochronous channel on the bus 977d67c46b9STakashi Sakamoto * @speed: firewire speed code 978acfedcbeSTakashi Sakamoto * @start_cycle: the isochronous cycle to start the context. Start immediately 979acfedcbeSTakashi Sakamoto * if negative value is given. 980af86b0b1STakashi Sakamoto * @queue_size: The number of packets in the queue. 981af86b0b1STakashi Sakamoto * @idle_irq_interval: the interval to queue packet during initial state. 982d67c46b9STakashi Sakamoto * 983d67c46b9STakashi Sakamoto * The stream cannot be started until it has been configured with 984d67c46b9STakashi Sakamoto * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI 985d67c46b9STakashi Sakamoto * device can be started. 986d67c46b9STakashi Sakamoto */ 987a0e02331STakashi Sakamoto static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed, 988af86b0b1STakashi Sakamoto int start_cycle, unsigned int queue_size, 989af86b0b1STakashi Sakamoto unsigned int idle_irq_interval) 990d67c46b9STakashi Sakamoto { 991d67c46b9STakashi Sakamoto static const struct { 992d67c46b9STakashi Sakamoto unsigned int data_block; 993d67c46b9STakashi Sakamoto unsigned int syt_offset; 994d3d10a4aSTakashi Sakamoto } *entry, initial_state[] = { 995d67c46b9STakashi Sakamoto [CIP_SFC_32000] = { 4, 3072 }, 996d67c46b9STakashi Sakamoto [CIP_SFC_48000] = { 6, 1024 }, 997d67c46b9STakashi Sakamoto [CIP_SFC_96000] = { 12, 1024 }, 998d67c46b9STakashi Sakamoto [CIP_SFC_192000] = { 24, 1024 }, 999d67c46b9STakashi Sakamoto [CIP_SFC_44100] = { 0, 67 }, 1000d67c46b9STakashi Sakamoto [CIP_SFC_88200] = { 0, 67 }, 1001d67c46b9STakashi Sakamoto [CIP_SFC_176400] = { 0, 67 }, 1002d67c46b9STakashi Sakamoto }; 10032472cfb3STakashi Sakamoto bool is_irq_target = (s == s->domain->irq_target); 1004d3d10a4aSTakashi Sakamoto unsigned int ctx_header_size; 1005f11453c7STakashi Sakamoto unsigned int max_ctx_payload_size; 1006d67c46b9STakashi Sakamoto enum dma_data_direction dir; 1007d67c46b9STakashi Sakamoto int type, tag, err; 1008d67c46b9STakashi Sakamoto 1009d67c46b9STakashi Sakamoto mutex_lock(&s->mutex); 1010d67c46b9STakashi Sakamoto 1011d67c46b9STakashi Sakamoto if (WARN_ON(amdtp_stream_running(s) || 1012d67c46b9STakashi Sakamoto (s->data_block_quadlets < 1))) { 1013d67c46b9STakashi Sakamoto err = -EBADFD; 1014d67c46b9STakashi Sakamoto goto err_unlock; 1015d67c46b9STakashi Sakamoto } 1016d67c46b9STakashi Sakamoto 1017d3d10a4aSTakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 101860dd4929STakashi Sakamoto // NOTE: IT context should be used for constant IRQ. 101960dd4929STakashi Sakamoto if (is_irq_target) { 102060dd4929STakashi Sakamoto err = -EINVAL; 102160dd4929STakashi Sakamoto goto err_unlock; 102260dd4929STakashi Sakamoto } 102360dd4929STakashi Sakamoto 1024d67c46b9STakashi Sakamoto s->data_block_counter = UINT_MAX; 1025d3d10a4aSTakashi Sakamoto } else { 1026d3d10a4aSTakashi Sakamoto entry = &initial_state[s->sfc]; 1027d3d10a4aSTakashi Sakamoto 1028d67c46b9STakashi Sakamoto s->data_block_counter = 0; 1029d3d10a4aSTakashi Sakamoto s->ctx_data.rx.data_block_state = entry->data_block; 1030d3d10a4aSTakashi Sakamoto s->ctx_data.rx.syt_offset_state = entry->syt_offset; 1031d3d10a4aSTakashi Sakamoto s->ctx_data.rx.last_syt_offset = TICKS_PER_CYCLE; 1032d3d10a4aSTakashi Sakamoto } 1033d67c46b9STakashi Sakamoto 1034d67c46b9STakashi Sakamoto /* initialize packet buffer */ 1035d67c46b9STakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 1036d67c46b9STakashi Sakamoto dir = DMA_FROM_DEVICE; 1037d67c46b9STakashi Sakamoto type = FW_ISO_CONTEXT_RECEIVE; 1038f11453c7STakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) 1039f11453c7STakashi Sakamoto ctx_header_size = IR_CTX_HEADER_SIZE_CIP; 1040f11453c7STakashi Sakamoto else 1041f11453c7STakashi Sakamoto ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP; 1042b18f0cfaSTakashi Sakamoto 1043b18f0cfaSTakashi Sakamoto max_ctx_payload_size = amdtp_stream_get_max_payload(s) - 1044b18f0cfaSTakashi Sakamoto ctx_header_size; 1045d67c46b9STakashi Sakamoto } else { 1046d67c46b9STakashi Sakamoto dir = DMA_TO_DEVICE; 1047d67c46b9STakashi Sakamoto type = FW_ISO_CONTEXT_TRANSMIT; 1048df9160b9STakashi Sakamoto ctx_header_size = 0; // No effect for IT context. 1049f11453c7STakashi Sakamoto 1050b18f0cfaSTakashi Sakamoto max_ctx_payload_size = amdtp_stream_get_max_payload(s); 1051b18f0cfaSTakashi Sakamoto if (!(s->flags & CIP_NO_HEADER)) 1052b18f0cfaSTakashi Sakamoto max_ctx_payload_size -= IT_PKT_HEADER_SIZE_CIP; 1053b18f0cfaSTakashi Sakamoto } 1054f11453c7STakashi Sakamoto 1055af86b0b1STakashi Sakamoto err = iso_packets_buffer_init(&s->buffer, s->unit, queue_size, 1056f11453c7STakashi Sakamoto max_ctx_payload_size, dir); 1057d67c46b9STakashi Sakamoto if (err < 0) 1058d67c46b9STakashi Sakamoto goto err_unlock; 1059af86b0b1STakashi Sakamoto s->queue_size = queue_size; 106060dd4929STakashi Sakamoto 1061d67c46b9STakashi Sakamoto s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, 1062d3d10a4aSTakashi Sakamoto type, channel, speed, ctx_header_size, 10632472cfb3STakashi Sakamoto amdtp_stream_first_callback, s); 1064d67c46b9STakashi Sakamoto if (IS_ERR(s->context)) { 1065d67c46b9STakashi Sakamoto err = PTR_ERR(s->context); 1066d67c46b9STakashi Sakamoto if (err == -EBUSY) 1067d67c46b9STakashi Sakamoto dev_err(&s->unit->device, 1068d67c46b9STakashi Sakamoto "no free stream on this controller\n"); 1069d67c46b9STakashi Sakamoto goto err_buffer; 1070d67c46b9STakashi Sakamoto } 1071d67c46b9STakashi Sakamoto 1072d67c46b9STakashi Sakamoto amdtp_stream_update(s); 1073d67c46b9STakashi Sakamoto 1074d3d10a4aSTakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 1075f11453c7STakashi Sakamoto s->ctx_data.tx.max_ctx_payload_length = max_ctx_payload_size; 1076d3d10a4aSTakashi Sakamoto s->ctx_data.tx.ctx_header_size = ctx_header_size; 1077d3d10a4aSTakashi Sakamoto } 107852759c09STakashi Sakamoto 10793b196c39STakashi Sakamoto if (s->flags & CIP_NO_HEADER) 10803b196c39STakashi Sakamoto s->tag = TAG_NO_CIP_HEADER; 10813b196c39STakashi Sakamoto else 10823b196c39STakashi Sakamoto s->tag = TAG_CIP; 10833b196c39STakashi Sakamoto 1084a0e02331STakashi Sakamoto s->pkt_descs = kcalloc(s->queue_size, sizeof(*s->pkt_descs), 108504130cf8STakashi Sakamoto GFP_KERNEL); 108604130cf8STakashi Sakamoto if (!s->pkt_descs) { 108704130cf8STakashi Sakamoto err = -ENOMEM; 108804130cf8STakashi Sakamoto goto err_context; 108904130cf8STakashi Sakamoto } 109004130cf8STakashi Sakamoto 1091d67c46b9STakashi Sakamoto s->packet_index = 0; 1092d67c46b9STakashi Sakamoto do { 10936007bf54STakashi Sakamoto struct fw_iso_packet params; 1094e229853dSTakashi Sakamoto 1095b18f0cfaSTakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 109660dd4929STakashi Sakamoto err = queue_in_packet(s, ¶ms); 1097b18f0cfaSTakashi Sakamoto } else { 109860dd4929STakashi Sakamoto bool sched_irq = false; 109960dd4929STakashi Sakamoto 1100b18f0cfaSTakashi Sakamoto params.header_length = 0; 1101b18f0cfaSTakashi Sakamoto params.payload_length = 0; 110260dd4929STakashi Sakamoto 110360dd4929STakashi Sakamoto if (is_irq_target) { 110460dd4929STakashi Sakamoto sched_irq = !((s->packet_index + 1) % 110560dd4929STakashi Sakamoto idle_irq_interval); 110660dd4929STakashi Sakamoto } 110760dd4929STakashi Sakamoto 1108e229853dSTakashi Sakamoto err = queue_out_packet(s, ¶ms, sched_irq); 1109b18f0cfaSTakashi Sakamoto } 1110d67c46b9STakashi Sakamoto if (err < 0) 111104130cf8STakashi Sakamoto goto err_pkt_descs; 1112d67c46b9STakashi Sakamoto } while (s->packet_index > 0); 1113d67c46b9STakashi Sakamoto 1114d67c46b9STakashi Sakamoto /* NOTE: TAG1 matches CIP. This just affects in stream. */ 1115d67c46b9STakashi Sakamoto tag = FW_ISO_CONTEXT_MATCH_TAG1; 11163b196c39STakashi Sakamoto if ((s->flags & CIP_EMPTY_WITH_TAG0) || (s->flags & CIP_NO_HEADER)) 1117d67c46b9STakashi Sakamoto tag |= FW_ISO_CONTEXT_MATCH_TAG0; 1118d67c46b9STakashi Sakamoto 1119d67c46b9STakashi Sakamoto s->callbacked = false; 1120acfedcbeSTakashi Sakamoto err = fw_iso_context_start(s->context, start_cycle, 0, tag); 1121d67c46b9STakashi Sakamoto if (err < 0) 112204130cf8STakashi Sakamoto goto err_pkt_descs; 1123d67c46b9STakashi Sakamoto 1124d67c46b9STakashi Sakamoto mutex_unlock(&s->mutex); 1125d67c46b9STakashi Sakamoto 1126d67c46b9STakashi Sakamoto return 0; 112704130cf8STakashi Sakamoto err_pkt_descs: 112804130cf8STakashi Sakamoto kfree(s->pkt_descs); 1129d67c46b9STakashi Sakamoto err_context: 1130d67c46b9STakashi Sakamoto fw_iso_context_destroy(s->context); 1131d67c46b9STakashi Sakamoto s->context = ERR_PTR(-1); 1132d67c46b9STakashi Sakamoto err_buffer: 1133d67c46b9STakashi Sakamoto iso_packets_buffer_destroy(&s->buffer, s->unit); 1134d67c46b9STakashi Sakamoto err_unlock: 1135d67c46b9STakashi Sakamoto mutex_unlock(&s->mutex); 1136d67c46b9STakashi Sakamoto 1137d67c46b9STakashi Sakamoto return err; 1138d67c46b9STakashi Sakamoto } 1139d67c46b9STakashi Sakamoto 1140d67c46b9STakashi Sakamoto /** 1141f890f9a0STakashi Sakamoto * amdtp_domain_stream_pcm_pointer - get the PCM buffer position 1142f890f9a0STakashi Sakamoto * @d: the AMDTP domain. 1143d67c46b9STakashi Sakamoto * @s: the AMDTP stream that transports the PCM data 1144d67c46b9STakashi Sakamoto * 1145d67c46b9STakashi Sakamoto * Returns the current buffer position, in frames. 1146d67c46b9STakashi Sakamoto */ 1147f890f9a0STakashi Sakamoto unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d, 1148f890f9a0STakashi Sakamoto struct amdtp_stream *s) 1149d67c46b9STakashi Sakamoto { 1150f890f9a0STakashi Sakamoto struct amdtp_stream *irq_target = d->irq_target; 1151f890f9a0STakashi Sakamoto 1152f890f9a0STakashi Sakamoto if (irq_target && amdtp_stream_running(irq_target)) { 1153f890f9a0STakashi Sakamoto // This function is called in software IRQ context of 1154f890f9a0STakashi Sakamoto // period_tasklet or process context. 1155f890f9a0STakashi Sakamoto // 1156f890f9a0STakashi Sakamoto // When the software IRQ context was scheduled by software IRQ 1157f890f9a0STakashi Sakamoto // context of IT contexts, queued packets were already handled. 1158f890f9a0STakashi Sakamoto // Therefore, no need to flush the queue in buffer furthermore. 1159f890f9a0STakashi Sakamoto // 1160f890f9a0STakashi Sakamoto // When the process context reach here, some packets will be 1161f890f9a0STakashi Sakamoto // already queued in the buffer. These packets should be handled 1162f890f9a0STakashi Sakamoto // immediately to keep better granularity of PCM pointer. 1163f890f9a0STakashi Sakamoto // 1164f890f9a0STakashi Sakamoto // Later, the process context will sometimes schedules software 1165f890f9a0STakashi Sakamoto // IRQ context of the period_tasklet. Then, no need to flush the 1166f890f9a0STakashi Sakamoto // queue by the same reason as described in the above 1167f890f9a0STakashi Sakamoto if (!in_interrupt()) { 1168f890f9a0STakashi Sakamoto // Queued packet should be processed without any kernel 1169f890f9a0STakashi Sakamoto // preemption to keep latency against bus cycle. 1170f890f9a0STakashi Sakamoto preempt_disable(); 1171f890f9a0STakashi Sakamoto fw_iso_context_flush_completions(irq_target->context); 1172f890f9a0STakashi Sakamoto preempt_enable(); 1173f890f9a0STakashi Sakamoto } 1174f890f9a0STakashi Sakamoto } 1175d67c46b9STakashi Sakamoto 11766aa7de05SMark Rutland return READ_ONCE(s->pcm_buffer_pointer); 1177d67c46b9STakashi Sakamoto } 1178f890f9a0STakashi Sakamoto EXPORT_SYMBOL_GPL(amdtp_domain_stream_pcm_pointer); 1179d67c46b9STakashi Sakamoto 1180d67c46b9STakashi Sakamoto /** 1181e6dcc92fSTakashi Sakamoto * amdtp_domain_stream_pcm_ack - acknowledge queued PCM frames 1182e6dcc92fSTakashi Sakamoto * @d: the AMDTP domain. 1183875becf8STakashi Sakamoto * @s: the AMDTP stream that transfers the PCM frames 1184875becf8STakashi Sakamoto * 1185875becf8STakashi Sakamoto * Returns zero always. 1186875becf8STakashi Sakamoto */ 1187e6dcc92fSTakashi Sakamoto int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s) 1188875becf8STakashi Sakamoto { 1189e6dcc92fSTakashi Sakamoto struct amdtp_stream *irq_target = d->irq_target; 1190e6dcc92fSTakashi Sakamoto 1191e6dcc92fSTakashi Sakamoto // Process isochronous packets for recent isochronous cycle to handle 1192e6dcc92fSTakashi Sakamoto // queued PCM frames. 1193e6dcc92fSTakashi Sakamoto if (irq_target && amdtp_stream_running(irq_target)) { 1194e6dcc92fSTakashi Sakamoto // Queued packet should be processed without any kernel 1195e6dcc92fSTakashi Sakamoto // preemption to keep latency against bus cycle. 1196e6dcc92fSTakashi Sakamoto preempt_disable(); 1197e6dcc92fSTakashi Sakamoto fw_iso_context_flush_completions(irq_target->context); 1198e6dcc92fSTakashi Sakamoto preempt_enable(); 1199e6dcc92fSTakashi Sakamoto } 1200875becf8STakashi Sakamoto 1201875becf8STakashi Sakamoto return 0; 1202875becf8STakashi Sakamoto } 1203e6dcc92fSTakashi Sakamoto EXPORT_SYMBOL_GPL(amdtp_domain_stream_pcm_ack); 1204875becf8STakashi Sakamoto 1205875becf8STakashi Sakamoto /** 1206d67c46b9STakashi Sakamoto * amdtp_stream_update - update the stream after a bus reset 1207d67c46b9STakashi Sakamoto * @s: the AMDTP stream 1208d67c46b9STakashi Sakamoto */ 1209d67c46b9STakashi Sakamoto void amdtp_stream_update(struct amdtp_stream *s) 1210d67c46b9STakashi Sakamoto { 1211d67c46b9STakashi Sakamoto /* Precomputing. */ 12126aa7de05SMark Rutland WRITE_ONCE(s->source_node_id_field, 12136aa7de05SMark Rutland (fw_parent_device(s->unit)->card->node_id << CIP_SID_SHIFT) & CIP_SID_MASK); 1214d67c46b9STakashi Sakamoto } 1215d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_update); 1216d67c46b9STakashi Sakamoto 1217d67c46b9STakashi Sakamoto /** 1218d67c46b9STakashi Sakamoto * amdtp_stream_stop - stop sending packets 1219d67c46b9STakashi Sakamoto * @s: the AMDTP stream to stop 1220d67c46b9STakashi Sakamoto * 1221d67c46b9STakashi Sakamoto * All PCM and MIDI devices of the stream must be stopped before the stream 1222d67c46b9STakashi Sakamoto * itself can be stopped. 1223d67c46b9STakashi Sakamoto */ 122474f94e41STakashi Sakamoto static void amdtp_stream_stop(struct amdtp_stream *s) 1225d67c46b9STakashi Sakamoto { 1226d67c46b9STakashi Sakamoto mutex_lock(&s->mutex); 1227d67c46b9STakashi Sakamoto 1228d67c46b9STakashi Sakamoto if (!amdtp_stream_running(s)) { 1229d67c46b9STakashi Sakamoto mutex_unlock(&s->mutex); 1230d67c46b9STakashi Sakamoto return; 1231d67c46b9STakashi Sakamoto } 1232d67c46b9STakashi Sakamoto 1233d67c46b9STakashi Sakamoto tasklet_kill(&s->period_tasklet); 1234d67c46b9STakashi Sakamoto fw_iso_context_stop(s->context); 1235d67c46b9STakashi Sakamoto fw_iso_context_destroy(s->context); 1236d67c46b9STakashi Sakamoto s->context = ERR_PTR(-1); 1237d67c46b9STakashi Sakamoto iso_packets_buffer_destroy(&s->buffer, s->unit); 123804130cf8STakashi Sakamoto kfree(s->pkt_descs); 1239d67c46b9STakashi Sakamoto 1240d67c46b9STakashi Sakamoto s->callbacked = false; 1241d67c46b9STakashi Sakamoto 1242d67c46b9STakashi Sakamoto mutex_unlock(&s->mutex); 1243d67c46b9STakashi Sakamoto } 1244d67c46b9STakashi Sakamoto 1245d67c46b9STakashi Sakamoto /** 1246d67c46b9STakashi Sakamoto * amdtp_stream_pcm_abort - abort the running PCM device 1247d67c46b9STakashi Sakamoto * @s: the AMDTP stream about to be stopped 1248d67c46b9STakashi Sakamoto * 1249d67c46b9STakashi Sakamoto * If the isochronous stream needs to be stopped asynchronously, call this 1250d67c46b9STakashi Sakamoto * function first to stop the PCM device. 1251d67c46b9STakashi Sakamoto */ 1252d67c46b9STakashi Sakamoto void amdtp_stream_pcm_abort(struct amdtp_stream *s) 1253d67c46b9STakashi Sakamoto { 1254d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm; 1255d67c46b9STakashi Sakamoto 12566aa7de05SMark Rutland pcm = READ_ONCE(s->pcm); 1257d67c46b9STakashi Sakamoto if (pcm) 1258d67c46b9STakashi Sakamoto snd_pcm_stop_xrun(pcm); 1259d67c46b9STakashi Sakamoto } 1260d67c46b9STakashi Sakamoto EXPORT_SYMBOL(amdtp_stream_pcm_abort); 12613ec3d7a3STakashi Sakamoto 12623ec3d7a3STakashi Sakamoto /** 12633ec3d7a3STakashi Sakamoto * amdtp_domain_init - initialize an AMDTP domain structure 12643ec3d7a3STakashi Sakamoto * @d: the AMDTP domain to initialize. 12653ec3d7a3STakashi Sakamoto */ 12663ec3d7a3STakashi Sakamoto int amdtp_domain_init(struct amdtp_domain *d) 12673ec3d7a3STakashi Sakamoto { 12683ec3d7a3STakashi Sakamoto INIT_LIST_HEAD(&d->streams); 12693ec3d7a3STakashi Sakamoto 1270d68c3123STakashi Sakamoto d->events_per_period = 0; 1271d68c3123STakashi Sakamoto 12723ec3d7a3STakashi Sakamoto return 0; 12733ec3d7a3STakashi Sakamoto } 12743ec3d7a3STakashi Sakamoto EXPORT_SYMBOL_GPL(amdtp_domain_init); 12753ec3d7a3STakashi Sakamoto 12763ec3d7a3STakashi Sakamoto /** 12773ec3d7a3STakashi Sakamoto * amdtp_domain_destroy - destroy an AMDTP domain structure 12783ec3d7a3STakashi Sakamoto * @d: the AMDTP domain to destroy. 12793ec3d7a3STakashi Sakamoto */ 12803ec3d7a3STakashi Sakamoto void amdtp_domain_destroy(struct amdtp_domain *d) 12813ec3d7a3STakashi Sakamoto { 12828d0d5c3fSTakashi Sakamoto // At present nothing to do. 12838d0d5c3fSTakashi Sakamoto return; 12843ec3d7a3STakashi Sakamoto } 12853ec3d7a3STakashi Sakamoto EXPORT_SYMBOL_GPL(amdtp_domain_destroy); 12866261f90bSTakashi Sakamoto 12876261f90bSTakashi Sakamoto /** 1288157a53eeSTakashi Sakamoto * amdtp_domain_add_stream - register isoc context into the domain. 1289157a53eeSTakashi Sakamoto * @d: the AMDTP domain. 1290157a53eeSTakashi Sakamoto * @s: the AMDTP stream. 1291157a53eeSTakashi Sakamoto * @channel: the isochronous channel on the bus. 1292157a53eeSTakashi Sakamoto * @speed: firewire speed code. 1293157a53eeSTakashi Sakamoto */ 1294157a53eeSTakashi Sakamoto int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s, 1295157a53eeSTakashi Sakamoto int channel, int speed) 1296157a53eeSTakashi Sakamoto { 1297157a53eeSTakashi Sakamoto struct amdtp_stream *tmp; 1298157a53eeSTakashi Sakamoto 1299157a53eeSTakashi Sakamoto list_for_each_entry(tmp, &d->streams, list) { 1300157a53eeSTakashi Sakamoto if (s == tmp) 1301157a53eeSTakashi Sakamoto return -EBUSY; 1302157a53eeSTakashi Sakamoto } 1303157a53eeSTakashi Sakamoto 1304157a53eeSTakashi Sakamoto list_add(&s->list, &d->streams); 1305157a53eeSTakashi Sakamoto 1306157a53eeSTakashi Sakamoto s->channel = channel; 1307157a53eeSTakashi Sakamoto s->speed = speed; 13082472cfb3STakashi Sakamoto s->domain = d; 1309157a53eeSTakashi Sakamoto 1310157a53eeSTakashi Sakamoto return 0; 1311157a53eeSTakashi Sakamoto } 1312157a53eeSTakashi Sakamoto EXPORT_SYMBOL_GPL(amdtp_domain_add_stream); 1313157a53eeSTakashi Sakamoto 1314acfedcbeSTakashi Sakamoto static int get_current_cycle_time(struct fw_card *fw_card, int *cur_cycle) 1315acfedcbeSTakashi Sakamoto { 1316acfedcbeSTakashi Sakamoto int generation; 1317acfedcbeSTakashi Sakamoto int rcode; 1318acfedcbeSTakashi Sakamoto __be32 reg; 1319acfedcbeSTakashi Sakamoto u32 data; 1320acfedcbeSTakashi Sakamoto 1321acfedcbeSTakashi Sakamoto // This is a request to local 1394 OHCI controller and expected to 1322acfedcbeSTakashi Sakamoto // complete without any event waiting. 1323acfedcbeSTakashi Sakamoto generation = fw_card->generation; 1324acfedcbeSTakashi Sakamoto smp_rmb(); // node_id vs. generation. 1325acfedcbeSTakashi Sakamoto rcode = fw_run_transaction(fw_card, TCODE_READ_QUADLET_REQUEST, 1326acfedcbeSTakashi Sakamoto fw_card->node_id, generation, SCODE_100, 1327acfedcbeSTakashi Sakamoto CSR_REGISTER_BASE + CSR_CYCLE_TIME, 1328acfedcbeSTakashi Sakamoto ®, sizeof(reg)); 1329acfedcbeSTakashi Sakamoto if (rcode != RCODE_COMPLETE) 1330acfedcbeSTakashi Sakamoto return -EIO; 1331acfedcbeSTakashi Sakamoto 1332acfedcbeSTakashi Sakamoto data = be32_to_cpu(reg); 1333acfedcbeSTakashi Sakamoto *cur_cycle = data >> 12; 1334acfedcbeSTakashi Sakamoto 1335acfedcbeSTakashi Sakamoto return 0; 1336acfedcbeSTakashi Sakamoto } 1337acfedcbeSTakashi Sakamoto 1338157a53eeSTakashi Sakamoto /** 13399b4702b0STakashi Sakamoto * amdtp_domain_start - start sending packets for isoc context in the domain. 13409b4702b0STakashi Sakamoto * @d: the AMDTP domain. 1341acfedcbeSTakashi Sakamoto * @ir_delay_cycle: the cycle delay to start all IR contexts. 13429b4702b0STakashi Sakamoto */ 1343acfedcbeSTakashi Sakamoto int amdtp_domain_start(struct amdtp_domain *d, unsigned int ir_delay_cycle) 13449b4702b0STakashi Sakamoto { 1345af86b0b1STakashi Sakamoto unsigned int events_per_buffer = d->events_per_buffer; 1346af86b0b1STakashi Sakamoto unsigned int events_per_period = d->events_per_period; 1347af86b0b1STakashi Sakamoto unsigned int idle_irq_interval; 1348af86b0b1STakashi Sakamoto unsigned int queue_size; 13499b4702b0STakashi Sakamoto struct amdtp_stream *s; 1350acfedcbeSTakashi Sakamoto int cycle; 1351acfedcbeSTakashi Sakamoto int err; 13529b4702b0STakashi Sakamoto 135360dd4929STakashi Sakamoto // Select an IT context as IRQ target. 13549b4702b0STakashi Sakamoto list_for_each_entry(s, &d->streams, list) { 135560dd4929STakashi Sakamoto if (s->direction == AMDTP_OUT_STREAM) 13569b4702b0STakashi Sakamoto break; 13579b4702b0STakashi Sakamoto } 135860dd4929STakashi Sakamoto if (!s) 135960dd4929STakashi Sakamoto return -ENXIO; 136060dd4929STakashi Sakamoto d->irq_target = s; 13619b4702b0STakashi Sakamoto 1362af86b0b1STakashi Sakamoto // This is a case that AMDTP streams in domain run just for MIDI 1363af86b0b1STakashi Sakamoto // substream. Use the number of events equivalent to 10 msec as 1364af86b0b1STakashi Sakamoto // interval of hardware IRQ. 1365af86b0b1STakashi Sakamoto if (events_per_period == 0) 1366af86b0b1STakashi Sakamoto events_per_period = amdtp_rate_table[d->irq_target->sfc] / 100; 1367af86b0b1STakashi Sakamoto if (events_per_buffer == 0) 1368af86b0b1STakashi Sakamoto events_per_buffer = events_per_period * 3; 1369af86b0b1STakashi Sakamoto 1370af86b0b1STakashi Sakamoto queue_size = DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_buffer, 1371af86b0b1STakashi Sakamoto amdtp_rate_table[d->irq_target->sfc]); 1372af86b0b1STakashi Sakamoto 1373acfedcbeSTakashi Sakamoto if (ir_delay_cycle > 0) { 1374acfedcbeSTakashi Sakamoto struct fw_card *fw_card = fw_parent_device(s->unit)->card; 1375acfedcbeSTakashi Sakamoto 1376acfedcbeSTakashi Sakamoto err = get_current_cycle_time(fw_card, &cycle); 1377acfedcbeSTakashi Sakamoto if (err < 0) 1378acfedcbeSTakashi Sakamoto return err; 1379acfedcbeSTakashi Sakamoto 1380acfedcbeSTakashi Sakamoto // No need to care overflow in cycle field because of enough 1381acfedcbeSTakashi Sakamoto // width. 1382acfedcbeSTakashi Sakamoto cycle += ir_delay_cycle; 1383acfedcbeSTakashi Sakamoto 1384acfedcbeSTakashi Sakamoto // Round up to sec field. 1385acfedcbeSTakashi Sakamoto if ((cycle & 0x00001fff) >= CYCLES_PER_SECOND) { 1386acfedcbeSTakashi Sakamoto unsigned int sec; 1387acfedcbeSTakashi Sakamoto 1388acfedcbeSTakashi Sakamoto // The sec field can overflow. 1389acfedcbeSTakashi Sakamoto sec = (cycle & 0xffffe000) >> 13; 1390acfedcbeSTakashi Sakamoto cycle = (++sec << 13) | 1391acfedcbeSTakashi Sakamoto ((cycle & 0x00001fff) / CYCLES_PER_SECOND); 1392acfedcbeSTakashi Sakamoto } 1393acfedcbeSTakashi Sakamoto 1394acfedcbeSTakashi Sakamoto // In OHCI 1394 specification, lower 2 bits are available for 1395acfedcbeSTakashi Sakamoto // sec field. 1396acfedcbeSTakashi Sakamoto cycle &= 0x00007fff; 1397acfedcbeSTakashi Sakamoto } else { 1398acfedcbeSTakashi Sakamoto cycle = -1; 1399acfedcbeSTakashi Sakamoto } 1400acfedcbeSTakashi Sakamoto 140160dd4929STakashi Sakamoto list_for_each_entry(s, &d->streams, list) { 1402acfedcbeSTakashi Sakamoto int cycle_match; 1403acfedcbeSTakashi Sakamoto 1404acfedcbeSTakashi Sakamoto if (s->direction == AMDTP_IN_STREAM) { 1405acfedcbeSTakashi Sakamoto cycle_match = cycle; 1406acfedcbeSTakashi Sakamoto } else { 1407acfedcbeSTakashi Sakamoto // IT context starts immediately. 1408acfedcbeSTakashi Sakamoto cycle_match = -1; 1409acfedcbeSTakashi Sakamoto } 1410acfedcbeSTakashi Sakamoto 141160dd4929STakashi Sakamoto if (s != d->irq_target) { 14122472cfb3STakashi Sakamoto err = amdtp_stream_start(s, s->channel, s->speed, 1413af86b0b1STakashi Sakamoto cycle_match, queue_size, 0); 141460dd4929STakashi Sakamoto if (err < 0) 141560dd4929STakashi Sakamoto goto error; 141660dd4929STakashi Sakamoto } 14179b4702b0STakashi Sakamoto } 14189b4702b0STakashi Sakamoto 141960dd4929STakashi Sakamoto s = d->irq_target; 1420af86b0b1STakashi Sakamoto s->ctx_data.rx.events_per_period = events_per_period; 1421af86b0b1STakashi Sakamoto s->ctx_data.rx.event_count = 0; 1422af86b0b1STakashi Sakamoto 1423af86b0b1STakashi Sakamoto idle_irq_interval = DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_period, 1424af86b0b1STakashi Sakamoto amdtp_rate_table[d->irq_target->sfc]); 1425af86b0b1STakashi Sakamoto err = amdtp_stream_start(s, s->channel, s->speed, -1, queue_size, 1426af86b0b1STakashi Sakamoto idle_irq_interval); 142760dd4929STakashi Sakamoto if (err < 0) 142860dd4929STakashi Sakamoto goto error; 142960dd4929STakashi Sakamoto 143060dd4929STakashi Sakamoto return 0; 143160dd4929STakashi Sakamoto error: 143260dd4929STakashi Sakamoto list_for_each_entry(s, &d->streams, list) 143360dd4929STakashi Sakamoto amdtp_stream_stop(s); 14349b4702b0STakashi Sakamoto return err; 14359b4702b0STakashi Sakamoto } 14369b4702b0STakashi Sakamoto EXPORT_SYMBOL_GPL(amdtp_domain_start); 14379b4702b0STakashi Sakamoto 14389b4702b0STakashi Sakamoto /** 14396261f90bSTakashi Sakamoto * amdtp_domain_stop - stop sending packets for isoc context in the same domain. 14406261f90bSTakashi Sakamoto * @d: the AMDTP domain to which the isoc contexts belong. 14416261f90bSTakashi Sakamoto */ 14426261f90bSTakashi Sakamoto void amdtp_domain_stop(struct amdtp_domain *d) 14436261f90bSTakashi Sakamoto { 14446261f90bSTakashi Sakamoto struct amdtp_stream *s, *next; 14456261f90bSTakashi Sakamoto 144660dd4929STakashi Sakamoto if (d->irq_target) 144760dd4929STakashi Sakamoto amdtp_stream_stop(d->irq_target); 144860dd4929STakashi Sakamoto 14496261f90bSTakashi Sakamoto list_for_each_entry_safe(s, next, &d->streams, list) { 14506261f90bSTakashi Sakamoto list_del(&s->list); 14516261f90bSTakashi Sakamoto 145260dd4929STakashi Sakamoto if (s != d->irq_target) 14536261f90bSTakashi Sakamoto amdtp_stream_stop(s); 14546261f90bSTakashi Sakamoto } 1455d68c3123STakashi Sakamoto 1456d68c3123STakashi Sakamoto d->events_per_period = 0; 145760dd4929STakashi Sakamoto d->irq_target = NULL; 14586261f90bSTakashi Sakamoto } 14596261f90bSTakashi Sakamoto EXPORT_SYMBOL_GPL(amdtp_domain_stop); 1460