| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Audio and Music Data Transmission Protocol (IEC 61883-6) streams |
| * with Common Isochronous Packet (IEC 61883-1) headers |
| * |
| * Copyright (c) Clemens Ladisch <clemens@ladisch.de> |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/firewire.h> |
| #include <linux/firewire-constants.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include "amdtp-stream.h" |
| |
| #define TICKS_PER_CYCLE 3072 |
| #define CYCLES_PER_SECOND 8000 |
| #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) |
| |
| #define OHCI_SECOND_MODULUS 8 |
| |
| /* Always support Linux tracing subsystem. */ |
| #define CREATE_TRACE_POINTS |
| #include "amdtp-stream-trace.h" |
| |
| #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 microseconds */ |
| |
| /* isochronous header parameters */ |
| #define ISO_DATA_LENGTH_SHIFT 16 |
| #define TAG_NO_CIP_HEADER 0 |
| #define TAG_CIP 1 |
| |
| // Common Isochronous Packet (CIP) header parameters. Use two quadlets CIP header when supported. |
| #define CIP_HEADER_QUADLETS 2 |
| #define CIP_EOH_SHIFT 31 |
| #define CIP_EOH (1u << CIP_EOH_SHIFT) |
| #define CIP_EOH_MASK 0x80000000 |
| #define CIP_SID_SHIFT 24 |
| #define CIP_SID_MASK 0x3f000000 |
| #define CIP_DBS_MASK 0x00ff0000 |
| #define CIP_DBS_SHIFT 16 |
| #define CIP_SPH_MASK 0x00000400 |
| #define CIP_SPH_SHIFT 10 |
| #define CIP_DBC_MASK 0x000000ff |
| #define CIP_FMT_SHIFT 24 |
| #define CIP_FMT_MASK 0x3f000000 |
| #define CIP_FDF_MASK 0x00ff0000 |
| #define CIP_FDF_SHIFT 16 |
| #define CIP_FDF_NO_DATA 0xff |
| #define CIP_SYT_MASK 0x0000ffff |
| #define CIP_SYT_NO_INFO 0xffff |
| #define CIP_SYT_CYCLE_MODULUS 16 |
| #define CIP_NO_DATA ((CIP_FDF_NO_DATA << CIP_FDF_SHIFT) | CIP_SYT_NO_INFO) |
| |
| #define CIP_HEADER_SIZE (sizeof(__be32) * CIP_HEADER_QUADLETS) |
| |
| /* Audio and Music transfer protocol specific parameters */ |
| #define CIP_FMT_AM 0x10 |
| #define AMDTP_FDF_NO_DATA 0xff |
| |
| // For iso header and tstamp. |
| #define IR_CTX_HEADER_DEFAULT_QUADLETS 2 |
| // Add nothing. |
| #define IR_CTX_HEADER_SIZE_NO_CIP (sizeof(__be32) * IR_CTX_HEADER_DEFAULT_QUADLETS) |
| // Add two quadlets CIP header. |
| #define IR_CTX_HEADER_SIZE_CIP (IR_CTX_HEADER_SIZE_NO_CIP + CIP_HEADER_SIZE) |
| #define HEADER_TSTAMP_MASK 0x0000ffff |
| |
| #define IT_PKT_HEADER_SIZE_CIP CIP_HEADER_SIZE |
| #define IT_PKT_HEADER_SIZE_NO_CIP 0 // Nothing. |
| |
| // The initial firmware of OXFW970 can postpone transmission of packet during finishing |
| // asynchronous transaction. This module accepts 5 cycles to skip as maximum to avoid buffer |
| // overrun. Actual device can skip more, then this module stops the packet streaming. |
| #define IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES 5 |
| |
| /** |
| * amdtp_stream_init - initialize an AMDTP stream structure |
| * @s: the AMDTP stream to initialize |
| * @unit: the target of the stream |
| * @dir: the direction of stream |
| * @flags: the details of the streaming protocol consist of cip_flags enumeration-constants. |
| * @fmt: the value of fmt field in CIP header |
| * @process_ctx_payloads: callback handler to process payloads of isoc context |
| * @protocol_size: the size to allocate newly for protocol |
| */ |
| int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
| enum amdtp_stream_direction dir, unsigned int flags, |
| unsigned int fmt, |
| amdtp_stream_process_ctx_payloads_t process_ctx_payloads, |
| unsigned int protocol_size) |
| { |
| if (process_ctx_payloads == NULL) |
| return -EINVAL; |
| |
| s->protocol = kzalloc(protocol_size, GFP_KERNEL); |
| if (!s->protocol) |
| return -ENOMEM; |
| |
| s->unit = unit; |
| s->direction = dir; |
| s->flags = flags; |
| s->context = ERR_PTR(-1); |
| mutex_init(&s->mutex); |
| s->packet_index = 0; |
| |
| init_waitqueue_head(&s->ready_wait); |
| |
| s->fmt = fmt; |
| s->process_ctx_payloads = process_ctx_payloads; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(amdtp_stream_init); |
| |
| /** |
| * amdtp_stream_destroy - free stream resources |
| * @s: the AMDTP stream to destroy |
| */ |
| void amdtp_stream_destroy(struct amdtp_stream *s) |
| { |
| /* Not initialized. */ |
| if (s->protocol == NULL) |
| return; |
| |
| WARN_ON(amdtp_stream_running(s)); |
| kfree(s->protocol); |
| mutex_destroy(&s->mutex); |
| } |
| EXPORT_SYMBOL(amdtp_stream_destroy); |
| |
| const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
| [CIP_SFC_32000] = 8, |
| [CIP_SFC_44100] = 8, |
| [CIP_SFC_48000] = 8, |
| [CIP_SFC_88200] = 16, |
| [CIP_SFC_96000] = 16, |
| [CIP_SFC_176400] = 32, |
| [CIP_SFC_192000] = 32, |
| }; |
| EXPORT_SYMBOL(amdtp_syt_intervals); |
| |
| const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = { |
| [CIP_SFC_32000] = 32000, |
| [CIP_SFC_44100] = 44100, |
| [CIP_SFC_48000] = 48000, |
| [CIP_SFC_88200] = 88200, |
| [CIP_SFC_96000] = 96000, |
| [CIP_SFC_176400] = 176400, |
| [CIP_SFC_192000] = 192000, |
| }; |
| EXPORT_SYMBOL(amdtp_rate_table); |
| |
| static int apply_constraint_to_size(struct snd_pcm_hw_params *params, |
| struct snd_pcm_hw_rule *rule) |
| { |
| struct snd_interval *s = hw_param_interval(params, rule->var); |
| const struct snd_interval *r = |
| hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); |
| struct snd_interval t = {0}; |
| unsigned int step = 0; |
| int i; |
| |
| for (i = 0; i < CIP_SFC_COUNT; ++i) { |
| if (snd_interval_test(r, amdtp_rate_table[i])) |
| step = max(step, amdtp_syt_intervals[i]); |
| } |
| |
| t.min = roundup(s->min, step); |
| t.max = rounddown(s->max, step); |
| t.integer = 1; |
| |
| return snd_interval_refine(s, &t); |
| } |
| |
| /** |
| * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream |
| * @s: the AMDTP stream, which must be initialized. |
| * @runtime: the PCM substream runtime |
| */ |
| int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, |
| struct snd_pcm_runtime *runtime) |
| { |
| struct snd_pcm_hardware *hw = &runtime->hw; |
| unsigned int ctx_header_size; |
| unsigned int maximum_usec_per_period; |
| int err; |
| |
| hw->info = SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_JOINT_DUPLEX | |
| SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_NO_PERIOD_WAKEUP; |
| |
| hw->periods_min = 2; |
| hw->periods_max = UINT_MAX; |
| |
| /* bytes for a frame */ |
| hw->period_bytes_min = 4 * hw->channels_max; |
| |
| /* Just to prevent from allocating much pages. */ |
| hw->period_bytes_max = hw->period_bytes_min * 2048; |
| hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; |
| |
| // Linux driver for 1394 OHCI controller voluntarily flushes isoc |
| // context when total size of accumulated context header reaches |
| // PAGE_SIZE. This kicks work for the isoc context and brings |
| // callback in the middle of scheduled interrupts. |
| // Although AMDTP streams in the same domain use the same events per |
| // IRQ, use the largest size of context header between IT/IR contexts. |
| // Here, use the value of context header in IR context is for both |
| // contexts. |
| if (!(s->flags & CIP_NO_HEADER)) |
| ctx_header_size = IR_CTX_HEADER_SIZE_CIP; |
| else |
| ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP; |
| maximum_usec_per_period = USEC_PER_SEC * PAGE_SIZE / |
| CYCLES_PER_SECOND / ctx_header_size; |
| |
| // In IEC 61883-6, one isoc packet can transfer events up to the value |
| // of syt interval. This comes from the interval of isoc cycle. As 1394 |
| // OHCI controller can generate hardware IRQ per isoc packet, the |
| // interval is 125 usec. |
| // However, there are two ways of transmission in IEC 61883-6; blocking |
| // and non-blocking modes. In blocking mode, the sequence of isoc packet |
| // includes 'empty' or 'NODATA' packets which include no event. In |
| // non-blocking mode, the number of events per packet is variable up to |
| // the syt interval. |
| // Due to the above protocol design, the minimum PCM frames per |
| // interrupt should be double of the value of syt interval, thus it is |
| // 250 usec. |
| err = snd_pcm_hw_constraint_minmax(runtime, |
| SNDRV_PCM_HW_PARAM_PERIOD_TIME, |
| 250, maximum_usec_per_period); |
| if (err < 0) |
| goto end; |
| |
| /* Non-Blocking stream has no more constraints */ |
| if (!(s->flags & CIP_BLOCKING)) |
| goto end; |
| |
| /* |
| * One AMDTP packet can include some frames. In blocking mode, the |
| * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, |
| * depending on its sampling rate. For accurate period interrupt, it's |
| * preferrable to align period/buffer sizes to current SYT_INTERVAL. |
| */ |
| err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, |
| apply_constraint_to_size, NULL, |
| SNDRV_PCM_HW_PARAM_PERIOD_SIZE, |
| SNDRV_PCM_HW_PARAM_RATE, -1); |
| if (err < 0) |
| goto end; |
| err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, |
| apply_constraint_to_size, NULL, |
| SNDRV_PCM_HW_PARAM_BUFFER_SIZE, |
| SNDRV_PCM_HW_PARAM_RATE, -1); |
| if (err < 0) |
| goto end; |
| end: |
| return err; |
| } |
| EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); |
| |
| /** |
| * amdtp_stream_set_parameters - set stream parameters |
| * @s: the AMDTP stream to configure |
| * @rate: the sample rate |
| * @data_block_quadlets: the size of a data block in quadlet unit |
| * @pcm_frame_multiplier: the multiplier to compute the number of PCM frames by the number of AMDTP |
| * events. |
| * |
| * The parameters must be set before the stream is started, and must not be |
| * changed while the stream is running. |
| */ |
| int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, |
| unsigned int data_block_quadlets, unsigned int pcm_frame_multiplier) |
| { |
| unsigned int sfc; |
| |
| for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) { |
| if (amdtp_rate_table[sfc] == rate) |
| break; |
| } |
| if (sfc == ARRAY_SIZE(amdtp_rate_table)) |
| return -EINVAL; |
| |
| s->sfc = sfc; |
| s->data_block_quadlets = data_block_quadlets; |
| s->syt_interval = amdtp_syt_intervals[sfc]; |
| |
| // default buffering in the device. |
| s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; |
| |
| // additional buffering needed to adjust for no-data packets. |
| if (s->flags & CIP_BLOCKING) |
| s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; |
| |
| s->pcm_frame_multiplier = pcm_frame_multiplier; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(amdtp_stream_set_parameters); |
| |
| // The CIP header is processed in context header apart from context payload. |
| static int amdtp_stream_get_max_ctx_payload_size(struct amdtp_stream *s) |
| { |
| unsigned int multiplier; |
| |
| if (s->flags & CIP_JUMBO_PAYLOAD) |
| multiplier = IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES; |
| else |
| multiplier = 1; |
| |
| return s->syt_interval * s->data_block_quadlets * sizeof(__be32) * multiplier; |
| } |
| |
| /** |
| * amdtp_stream_get_max_payload - get the stream's packet size |
| * @s: the AMDTP stream |
| * |
| * This function must not be called before the stream has been configured |
| * with amdtp_stream_set_parameters(). |
| */ |
| unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
| { |
| unsigned int cip_header_size; |
| |
| if (!(s->flags & CIP_NO_HEADER)) |
| cip_header_size = CIP_HEADER_SIZE; |
| else |
| cip_header_size = 0; |
| |
| return cip_header_size + amdtp_stream_get_max_ctx_payload_size(s); |
| } |
| EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
| |
| /** |
| * amdtp_stream_pcm_prepare - prepare PCM device for running |
| * @s: the AMDTP stream |
| * |
| * This function should be called from the PCM device's .prepare callback. |
| */ |
| void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
| { |
| s->pcm_buffer_pointer = 0; |
| s->pcm_period_pointer = 0; |
| } |
| EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
| |
| #define prev_packet_desc(s, desc) \ |
| list_prev_entry_circular(desc, &s->packet_descs_list, link) |
| |
| static void pool_blocking_data_blocks(struct amdtp_stream *s, struct seq_desc *descs, |
| unsigned int size, unsigned int pos, unsigned int count) |
| { |
| const unsigned int syt_interval = s->syt_interval; |
| int i; |
| |
| for (i = 0; i < count; ++i) { |
| struct seq_desc *desc = descs + pos; |
| |
| if (desc->syt_offset != CIP_SYT_NO_INFO) |
| desc->data_blocks = syt_interval; |
| else |
| desc->data_blocks = 0; |
| |
| pos = (pos + 1) % size; |
| } |
| } |
| |
| static void pool_ideal_nonblocking_data_blocks(struct amdtp_stream *s, struct seq_desc *descs, |
| unsigned int size, unsigned int pos, |
| unsigned int count) |
| { |
| const enum cip_sfc sfc = s->sfc; |
| unsigned int state = s->ctx_data.rx.data_block_state; |
| int i; |
| |
| for (i = 0; i < count; ++i) { |
| struct seq_desc *desc = descs + pos; |
| |
| if (!cip_sfc_is_base_44100(sfc)) { |
| // Sample_rate / 8000 is an integer, and precomputed. |
| desc->data_blocks = state; |
| } else { |
| unsigned int phase = state; |
| |
| /* |
| * This calculates the number of data blocks per packet so that |
| * 1) the overall rate is correct and exactly synchronized to |
| * the bus clock, and |
| * 2) packets with a rounded-up number of blocks occur as early |
| * as possible in the sequence (to prevent underruns of the |
| * device's buffer). |
| */ |
| if (sfc == CIP_SFC_44100) |
| /* 6 6 5 6 5 6 5 ... */ |
| desc->data_blocks = 5 + ((phase & 1) ^ (phase == 0 || phase >= 40)); |
| else |
| /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ |
| desc->data_blocks = 11 * (sfc >> 1) + (phase == 0); |
| if (++phase >= (80 >> (sfc >> 1))) |
| phase = 0; |
| state = phase; |
| } |
| |
| pos = (pos + 1) % size; |
| } |
| |
| s->ctx_data.rx.data_block_state = state; |
| } |
| |
| static unsigned int calculate_syt_offset(unsigned int *last_syt_offset, |
| unsigned int *syt_offset_state, enum cip_sfc sfc) |
| { |
| unsigned int syt_offset; |
| |
| if (*last_syt_offset < TICKS_PER_CYCLE) { |
| if (!cip_sfc_is_base_44100(sfc)) |
| syt_offset = *last_syt_offset + *syt_offset_state; |
| else { |
| /* |
| * The time, in ticks, of the n'th SYT_INTERVAL sample is: |
| * n * SYT_INTERVAL * 24576000 / sample_rate |
| * Modulo TICKS_PER_CYCLE, the difference between successive |
| * elements is about 1386.23. Rounding the results of this |
| * formula to the SYT precision results in a sequence of |
| * differences that begins with: |
| * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... |
| * This code generates _exactly_ the same sequence. |
| */ |
| unsigned int phase = *syt_offset_state; |
| unsigned int index = phase % 13; |
| |
| syt_offset = *last_syt_offset; |
| syt_offset += 1386 + ((index && !(index & 3)) || |
| phase == 146); |
| if (++phase >= 147) |
| phase = 0; |
| *syt_offset_state = phase; |
| } |
| } else |
| syt_offset = *last_syt_offset - TICKS_PER_CYCLE; |
| *last_syt_offset = syt_offset; |
| |
| if (syt_offset >= TICKS_PER_CYCLE) |
| syt_offset = CIP_SYT_NO_INFO; |
| |
| return syt_offset; |
| } |
| |
| static void pool_ideal_syt_offsets(struct amdtp_stream *s, struct seq_desc *descs, |
| unsigned int size, unsigned int pos, unsigned int count) |
| { |
| const enum cip_sfc sfc = s->sfc; |
| unsigned int last = s->ctx_data.rx.last_syt_offset; |
| unsigned int state = s->ctx_data.rx.syt_offset_state; |
| int i; |
| |
| for (i = 0; i < count; ++i) { |
| struct seq_desc *desc = descs + pos; |
| |
| desc->syt_offset = calculate_syt_offset(&last, &state, sfc); |
| |
| pos = (pos + 1) % size; |
| } |
| |
| s->ctx_data.rx.last_syt_offset = last; |
| s->ctx_data.rx.syt_offset_state = state; |
| } |
| |
| static unsigned int compute_syt_offset(unsigned int syt, unsigned int cycle, |
| unsigned int transfer_delay) |
| { |
| unsigned int cycle_lo = (cycle % CYCLES_PER_SECOND) & 0x0f; |
| unsigned int syt_cycle_lo = (syt & 0xf000) >> 12; |
| unsigned int syt_offset; |
| |
| // Round up. |
| if (syt_cycle_lo < cycle_lo) |
| syt_cycle_lo += CIP_SYT_CYCLE_MODULUS; |
| syt_cycle_lo -= cycle_lo; |
| |
| // Subtract transfer delay so that the synchronization offset is not so large |
| // at transmission. |
| syt_offset = syt_cycle_lo * TICKS_PER_CYCLE + (syt & 0x0fff); |
| if (syt_offset < transfer_delay) |
| syt_offset += CIP_SYT_CYCLE_MODULUS * TICKS_PER_CYCLE; |
| |
| return syt_offset - transfer_delay; |
| } |
| |
| // Both of the producer and consumer of the queue runs in the same clock of IEEE 1394 bus. |
| // Additionally, the sequence of tx packets is severely checked against any discontinuity |
| // before filling entries in the queue. The calculation is safe even if it looks fragile by |
| // overrun. |
| static unsigned int calculate_cached_cycle_count(struct amdtp_stream *s, unsigned int head) |
| { |
| const unsigned int cache_size = s->ctx_data.tx.cache.size; |
| unsigned int cycles = s->ctx_data.tx.cache.pos; |
| |
| if (cycles < head) |
| cycles += cache_size; |
| cycles -= head; |
| |
| return cycles; |
| } |
| |
| static void cache_seq(struct amdtp_stream *s, const struct pkt_desc *src, unsigned int desc_count) |
| { |
| const unsigned int transfer_delay = s->transfer_delay; |
| const unsigned int cache_size = s->ctx_data.tx.cache.size; |
| struct seq_desc *cache = s->ctx_data.tx.cache.descs; |
| unsigned int cache_pos = s->ctx_data.tx.cache.pos; |
| bool aware_syt = !(s->flags & CIP_UNAWARE_SYT); |
| int i; |
| |
| for (i = 0; i < desc_count; ++i) { |
| struct seq_desc *dst = cache + cache_pos; |
| |
| if (aware_syt && src->syt != CIP_SYT_NO_INFO) |
| dst->syt_offset = compute_syt_offset(src->syt, src->cycle, transfer_delay); |
| else |
| dst->syt_offset = CIP_SYT_NO_INFO; |
| dst->data_blocks = src->data_blocks; |
| |
| cache_pos = (cache_pos + 1) % cache_size; |
| src = amdtp_stream_next_packet_desc(s, src); |
| } |
| |
| s->ctx_data.tx.cache.pos = cache_pos; |
| } |
| |
| static void pool_ideal_seq_descs(struct amdtp_stream *s, struct seq_desc *descs, unsigned int size, |
| unsigned int pos, unsigned int count) |
| { |
| pool_ideal_syt_offsets(s, descs, size, pos, count); |
| |
| if (s->flags & CIP_BLOCKING) |
| pool_blocking_data_blocks(s, descs, size, pos, count); |
| else |
| pool_ideal_nonblocking_data_blocks(s, descs, size, pos, count); |
| } |
| |
| static void pool_replayed_seq(struct amdtp_stream *s, struct seq_desc *descs, unsigned int size, |
| unsigned int pos, unsigned int count) |
| { |
| struct amdtp_stream *target = s->ctx_data.rx.replay_target; |
| const struct seq_desc *cache = target->ctx_data.tx.cache.descs; |
| const unsigned int cache_size = target->ctx_data.tx.cache.size; |
| unsigned int cache_pos = s->ctx_data.rx.cache_pos; |
| int i; |
| |
| for (i = 0; i < count; ++i) { |
| descs[pos] = cache[cache_pos]; |
| cache_pos = (cache_pos + 1) % cache_size; |
| pos = (pos + 1) % size; |
| } |
| |
| s->ctx_data.rx.cache_pos = cache_pos; |
| } |
| |
| static void pool_seq_descs(struct amdtp_stream *s, struct seq_desc *descs, unsigned int size, |
| unsigned int pos, unsigned int count) |
| { |
| struct amdtp_domain *d = s->domain; |
| void (*pool_seq_descs)(struct amdtp_stream *s, struct seq_desc *descs, unsigned int size, |
| unsigned int pos, unsigned int count); |
| |
| if (!d->replay.enable || !s->ctx_data.rx.replay_target) { |
| pool_seq_descs = pool_ideal_seq_descs; |
| } else { |
| if (!d->replay.on_the_fly) { |
| pool_seq_descs = pool_replayed_seq; |
| } else { |
| struct amdtp_stream *tx = s->ctx_data.rx.replay_target; |
| const unsigned int cache_size = tx->ctx_data.tx.cache.size; |
| const unsigned int cache_pos = s->ctx_data.rx.cache_pos; |
| unsigned int cached_cycles = calculate_cached_cycle_count(tx, cache_pos); |
| |
| if (cached_cycles > count && cached_cycles > cache_size / 2) |
| pool_seq_descs = pool_replayed_seq; |
| else |
| pool_seq_descs = pool_ideal_seq_descs; |
| } |
| } |
| |
| pool_seq_descs(s, descs, size, pos, count); |
| } |
| |
| static void update_pcm_pointers(struct amdtp_stream *s, |
| struct snd_pcm_substream *pcm, |
| unsigned int frames) |
| { |
| unsigned int ptr; |
| |
| ptr = s->pcm_buffer_pointer + frames; |
| if (ptr >= pcm->runtime->buffer_size) |
| ptr -= pcm->runtime->buffer_size; |
| WRITE_ONCE(s->pcm_buffer_pointer, ptr); |
| |
| s->pcm_period_pointer += frames; |
| if (s->pcm_period_pointer >= pcm->runtime->period_size) { |
| s->pcm_period_pointer -= pcm->runtime->period_size; |
| |
| // The program in user process should periodically check the status of intermediate |
| // buffer associated to PCM substream to process PCM frames in the buffer, instead |
| // of receiving notification of period elapsed by poll wait. |
| if (!pcm->runtime->no_period_wakeup) { |
| if (in_softirq()) { |
| // In software IRQ context for 1394 OHCI. |
| snd_pcm_period_elapsed(pcm); |
| } else { |
| // In process context of ALSA PCM application under acquired lock of |
| // PCM substream. |
| snd_pcm_period_elapsed_under_stream_lock(pcm); |
| } |
| } |
| } |
| } |
| |
| static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params, |
| bool sched_irq) |
| { |
| int err; |
| |
| params->interrupt = sched_irq; |
| params->tag = s->tag; |
| params->sy = 0; |
| |
| err = fw_iso_context_queue(s->context, params, &s->buffer.iso_buffer, |
| s->buffer.packets[s->packet_index].offset); |
| if (err < 0) { |
| dev_err(&s->unit->device, "queueing error: %d\n", err); |
| goto end; |
| } |
| |
| if (++s->packet_index >= s->queue_size) |
| s->packet_index = 0; |
| end: |
| return err; |
| } |
| |
| static inline int queue_out_packet(struct amdtp_stream *s, |
| struct fw_iso_packet *params, bool sched_irq) |
| { |
| params->skip = |
| !!(params->header_length == 0 && params->payload_length == 0); |
| return queue_packet(s, params, sched_irq); |
| } |
| |
| static inline int queue_in_packet(struct amdtp_stream *s, |
| struct fw_iso_packet *params) |
| { |
| // Queue one packet for IR context. |
| params->header_length = s->ctx_data.tx.ctx_header_size; |
| params->payload_length = s->ctx_data.tx.max_ctx_payload_length; |
| params->skip = false; |
| return queue_packet(s, params, false); |
| } |
| |
| static void generate_cip_header(struct amdtp_stream *s, __be32 cip_header[2], |
| unsigned int data_block_counter, unsigned int syt) |
| { |
| cip_header[0] = cpu_to_be32(READ_ONCE(s->source_node_id_field) | |
| (s->data_block_quadlets << CIP_DBS_SHIFT) | |
| ((s->sph << CIP_SPH_SHIFT) & CIP_SPH_MASK) | |
| data_block_counter); |
| cip_header[1] = cpu_to_be32(CIP_EOH | |
| ((s->fmt << CIP_FMT_SHIFT) & CIP_FMT_MASK) | |
| ((s->ctx_data.rx.fdf << CIP_FDF_SHIFT) & CIP_FDF_MASK) | |
| (syt & CIP_SYT_MASK)); |
| } |
| |
| static void build_it_pkt_header(struct amdtp_stream *s, unsigned int cycle, |
| struct fw_iso_packet *params, unsigned int header_length, |
| unsigned int data_blocks, |
| unsigned int data_block_counter, |
| unsigned int syt, unsigned int index, u32 curr_cycle_time) |
| { |
| unsigned int payload_length; |
| __be32 *cip_header; |
| |
| payload_length = data_blocks * sizeof(__be32) * s->data_block_quadlets; |
| params->payload_length = payload_length; |
| |
| if (header_length > 0) { |
| cip_header = (__be32 *)params->header; |
| generate_cip_header(s, cip_header, data_block_counter, syt); |
| params->header_length = header_length; |
| } else { |
| cip_header = NULL; |
| } |
| |
| trace_amdtp_packet(s, cycle, cip_header, payload_length + header_length, data_blocks, |
| data_block_counter, s->packet_index, index, curr_cycle_time); |
| } |
| |
| static int check_cip_header(struct amdtp_stream *s, const __be32 *buf, |
| unsigned int payload_length, |
| unsigned int *data_blocks, |
| unsigned int *data_block_counter, unsigned int *syt) |
| { |
| u32 cip_header[2]; |
| unsigned int sph; |
| unsigned int fmt; |
| unsigned int fdf; |
| unsigned int dbc; |
| bool lost; |
| |
| cip_header[0] = be32_to_cpu(buf[0]); |
| cip_header[1] = be32_to_cpu(buf[1]); |
| |
| /* |
| * This module supports 'Two-quadlet CIP header with SYT field'. |
| * For convenience, also check FMT field is AM824 or not. |
| */ |
| if ((((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || |
| ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH)) && |
| (!(s->flags & CIP_HEADER_WITHOUT_EOH))) { |
| dev_info_ratelimited(&s->unit->device, |
| "Invalid CIP header for AMDTP: %08X:%08X\n", |
| cip_header[0], cip_header[1]); |
| return -EAGAIN; |
| } |
| |
| /* Check valid protocol or not. */ |
| sph = (cip_header[0] & CIP_SPH_MASK) >> CIP_SPH_SHIFT; |
| fmt = (cip_header[1] & CIP_FMT_MASK) >> CIP_FMT_SHIFT; |
| if (sph != s->sph || fmt != s->fmt) { |
| dev_info_ratelimited(&s->unit->device, |
| "Detect unexpected protocol: %08x %08x\n", |
| cip_header[0], cip_header[1]); |
| return -EAGAIN; |
| } |
| |
| /* Calculate data blocks */ |
| fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT; |
| if (payload_length == 0 || (fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) { |
| *data_blocks = 0; |
| } else { |
| unsigned int data_block_quadlets = |
| (cip_header[0] & CIP_DBS_MASK) >> CIP_DBS_SHIFT; |
| /* avoid division by zero */ |
| if (data_block_quadlets == 0) { |
| dev_err(&s->unit->device, |
| "Detect invalid value in dbs field: %08X\n", |
| cip_header[0]); |
| return -EPROTO; |
| } |
| if (s->flags & CIP_WRONG_DBS) |
| data_block_quadlets = s->data_block_quadlets; |
| |
| *data_blocks = payload_length / sizeof(__be32) / data_block_quadlets; |
| } |
| |
| /* Check data block counter continuity */ |
| dbc = cip_header[0] & CIP_DBC_MASK; |
| if (*data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) && |
| *data_block_counter != UINT_MAX) |
| dbc = *data_block_counter; |
| |
| if ((dbc == 0x00 && (s->flags & CIP_SKIP_DBC_ZERO_CHECK)) || |
| *data_block_counter == UINT_MAX) { |
| lost = false; |
| } else if (!(s->flags & CIP_DBC_IS_END_EVENT)) { |
| lost = dbc != *data_block_counter; |
| } else { |
| unsigned int dbc_interval; |
| |
| if (!(s->flags & CIP_DBC_IS_PAYLOAD_QUADLETS)) { |
| if (*data_blocks > 0 && s->ctx_data.tx.dbc_interval > 0) |
| dbc_interval = s->ctx_data.tx.dbc_interval; |
| else |
| dbc_interval = *data_blocks; |
| } else { |
| dbc_interval = payload_length / sizeof(__be32); |
| } |
| |
| lost = dbc != ((*data_block_counter + dbc_interval) & 0xff); |
| } |
| |
| if (lost) { |
| dev_err(&s->unit->device, |
| "Detect discontinuity of CIP: %02X %02X\n", |
| *data_block_counter, dbc); |
| return -EIO; |
| } |
| |
| *data_block_counter = dbc; |
| |
| if (!(s->flags & CIP_UNAWARE_SYT)) |
| *syt = cip_header[1] & CIP_SYT_MASK; |
| |
| return 0; |
| } |
| |
| static int parse_ir_ctx_header(struct amdtp_stream *s, unsigned int cycle, |
| const __be32 *ctx_header, |
| unsigned int *data_blocks, |
| unsigned int *data_block_counter, |
| unsigned int *syt, unsigned int packet_index, unsigned int index, |
| u32 curr_cycle_time) |
| { |
| unsigned int payload_length; |
| const __be32 *cip_header; |
| unsigned int cip_header_size; |
| |
| payload_length = be32_to_cpu(ctx_header[0]) >> ISO_DATA_LENGTH_SHIFT; |
| |
| if (!(s->flags & CIP_NO_HEADER)) |
| cip_header_size = CIP_HEADER_SIZE; |
| else |
| cip_header_size = 0; |
| |
| if (payload_length > cip_header_size + s->ctx_data.tx.max_ctx_payload_length) { |
| dev_err(&s->unit->device, |
| "Detect jumbo payload: %04x %04x\n", |
| payload_length, cip_header_size + s->ctx_data.tx.max_ctx_payload_length); |
| return -EIO; |
| } |
| |
| if (cip_header_size > 0) { |
| if (payload_length >= cip_header_size) { |
| int err; |
| |
| cip_header = ctx_header + IR_CTX_HEADER_DEFAULT_QUADLETS; |
| err = check_cip_header(s, cip_header, payload_length - cip_header_size, |
| data_blocks, data_block_counter, syt); |
| if (err < 0) |
| return err; |
| } else { |
| // Handle the cycle so that empty packet arrives. |
| cip_header = NULL; |
| *data_blocks = 0; |
| *syt = 0; |
| } |
| } else { |
| cip_header = NULL; |
| *data_blocks = payload_length / sizeof(__be32) / s->data_block_quadlets; |
| *syt = 0; |
| |
| if (*data_block_counter == UINT_MAX) |
| *data_block_counter = 0; |
| } |
| |
| trace_amdtp_packet(s, cycle, cip_header, payload_length, *data_blocks, |
| *data_block_counter, packet_index, index, curr_cycle_time); |
| |
| return 0; |
| } |
| |
| // In CYCLE_TIMER register of IEEE 1394, 7 bits are used to represent second. On |
| // the other hand, in DMA descriptors of 1394 OHCI, 3 bits are used to represent |
| // it. Thus, via Linux firewire subsystem, we can get the 3 bits for second. |
| static inline u32 compute_ohci_iso_ctx_cycle_count(u32 tstamp) |
| { |
| return (((tstamp >> 13) & 0x07) * CYCLES_PER_SECOND) + (tstamp & 0x1fff); |
| } |
| |
| static inline u32 compute_ohci_cycle_count(__be32 ctx_header_tstamp) |
| { |
| u32 tstamp = be32_to_cpu(ctx_header_tstamp) & HEADER_TSTAMP_MASK; |
| return compute_ohci_iso_ctx_cycle_count(tstamp); |
| } |
| |
| static inline u32 increment_ohci_cycle_count(u32 cycle, unsigned int addend) |
| { |
| cycle += addend; |
| if (cycle >= OHCI_SECOND_MODULUS * CYCLES_PER_SECOND) |
| cycle -= OHCI_SECOND_MODULUS * CYCLES_PER_SECOND; |
| return cycle; |
| } |
| |
| static inline u32 decrement_ohci_cycle_count(u32 minuend, u32 subtrahend) |
| { |
| if (minuend < subtrahend) |
| minuend += OHCI_SECOND_MODULUS * CYCLES_PER_SECOND; |
| |
| return minuend - subtrahend; |
| } |
| |
| static int compare_ohci_cycle_count(u32 lval, u32 rval) |
| { |
| if (lval == rval) |
| return 0; |
| else if (lval < rval && rval - lval < OHCI_SECOND_MODULUS * CYCLES_PER_SECOND / 2) |
| return -1; |
| else |
| return 1; |
| } |
| |
| // Align to actual cycle count for the packet which is going to be scheduled. |
| // This module queued the same number of isochronous cycle as the size of queue |
| // to kip isochronous cycle, therefore it's OK to just increment the cycle by |
| // the size of queue for scheduled cycle. |
| static inline u32 compute_ohci_it_cycle(const __be32 ctx_header_tstamp, |
| unsigned int queue_size) |
| { |
| u32 cycle = compute_ohci_cycle_count(ctx_header_tstamp); |
| return increment_ohci_cycle_count(cycle, queue_size); |
| } |
| |
| static int generate_tx_packet_descs(struct amdtp_stream *s, struct pkt_desc *desc, |
| const __be32 *ctx_header, unsigned int packet_count, |
| unsigned int *desc_count) |
| { |
| unsigned int next_cycle = s->next_cycle; |
| unsigned int dbc = s->data_block_counter; |
| unsigned int packet_index = s->packet_index; |
| unsigned int queue_size = s->queue_size; |
| u32 curr_cycle_time = 0; |
| int i; |
| int err; |
| |
| if (trace_amdtp_packet_enabled()) |
| (void)fw_card_read_cycle_time(fw_parent_device(s->unit)->card, &curr_cycle_time); |
| |
| *desc_count = 0; |
| for (i = 0; i < packet_count; ++i) { |
| unsigned int cycle; |
| bool lost; |
| unsigned int data_blocks; |
| unsigned int syt; |
| |
| cycle = compute_ohci_cycle_count(ctx_header[1]); |
| lost = (next_cycle != cycle); |
| if (lost) { |
| if (s->flags & CIP_NO_HEADER) { |
| // Fireface skips transmission just for an isoc cycle corresponding |
| // to empty packet. |
| unsigned int prev_cycle = next_cycle; |
| |
| next_cycle = increment_ohci_cycle_count(next_cycle, 1); |
| lost = (next_cycle != cycle); |
| if (!lost) { |
| // Prepare a description for the skipped cycle for |
| // sequence replay. |
| desc->cycle = prev_cycle; |
| desc->syt = 0; |
| desc->data_blocks = 0; |
| desc->data_block_counter = dbc; |
| desc->ctx_payload = NULL; |
| desc = amdtp_stream_next_packet_desc(s, desc); |
| ++(*desc_count); |
| } |
| } else if (s->flags & CIP_JUMBO_PAYLOAD) { |
| // OXFW970 skips transmission for several isoc cycles during |
| // asynchronous transaction. The sequence replay is impossible due |
| // to the reason. |
| unsigned int safe_cycle = increment_ohci_cycle_count(next_cycle, |
| IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES); |
| lost = (compare_ohci_cycle_count(safe_cycle, cycle) < 0); |
| } |
| if (lost) { |
| dev_err(&s->unit->device, "Detect discontinuity of cycle: %d %d\n", |
| next_cycle, cycle); |
| return -EIO; |
| } |
| } |
| |
| err = parse_ir_ctx_header(s, cycle, ctx_header, &data_blocks, &dbc, &syt, |
| packet_index, i, curr_cycle_time); |
| if (err < 0) |
| return err; |
| |
| desc->cycle = cycle; |
| desc->syt = syt; |
| desc->data_blocks = data_blocks; |
| desc->data_block_counter = dbc; |
| desc->ctx_payload = s->buffer.packets[packet_index].buffer; |
| |
| if (!(s->flags & CIP_DBC_IS_END_EVENT)) |
| dbc = (dbc + desc->data_blocks) & 0xff; |
| |
| next_cycle = increment_ohci_cycle_count(next_cycle, 1); |
| desc = amdtp_stream_next_packet_desc(s, desc); |
| ++(*desc_count); |
| ctx_header += s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header); |
| packet_index = (packet_index + 1) % queue_size; |
| } |
| |
| s->next_cycle = next_cycle; |
| s->data_block_counter = dbc; |
| |
| return 0; |
| } |
| |
| static unsigned int compute_syt(unsigned int syt_offset, unsigned int cycle, |
| unsigned int transfer_delay) |
| { |
| unsigned int syt; |
| |
| syt_offset += transfer_delay; |
| syt = ((cycle + syt_offset / TICKS_PER_CYCLE) << 12) | |
| (syt_offset % TICKS_PER_CYCLE); |
| return syt & CIP_SYT_MASK; |
| } |
| |
| static void generate_rx_packet_descs(struct amdtp_stream *s, struct pkt_desc *desc, |
| const __be32 *ctx_header, unsigned int packet_count) |
| { |
| struct seq_desc *seq_descs = s->ctx_data.rx.seq.descs; |
| unsigned int seq_size = s->ctx_data.rx.seq.size; |
| unsigned int seq_pos = s->ctx_data.rx.seq.pos; |
| unsigned int dbc = s->data_block_counter; |
| bool aware_syt = !(s->flags & CIP_UNAWARE_SYT); |
| int i; |
| |
| pool_seq_descs(s, seq_descs, seq_size, seq_pos, packet_count); |
| |
| for (i = 0; i < packet_count; ++i) { |
| unsigned int index = (s->packet_index + i) % s->queue_size; |
| const struct seq_desc *seq = seq_descs + seq_pos; |
| |
| desc->cycle = compute_ohci_it_cycle(*ctx_header, s->queue_size); |
| |
| if (aware_syt && seq->syt_offset != CIP_SYT_NO_INFO) |
| desc->syt = compute_syt(seq->syt_offset, desc->cycle, s->transfer_delay); |
| else |
| desc->syt = CIP_SYT_NO_INFO; |
| |
| desc->data_blocks = seq->data_blocks; |
| |
| if (s->flags & CIP_DBC_IS_END_EVENT) |
| dbc = (dbc + desc->data_blocks) & 0xff; |
| |
| desc->data_block_counter = dbc; |
| |
| if (!(s->flags & CIP_DBC_IS_END_EVENT)) |
| dbc = (dbc + desc->data_blocks) & 0xff; |
| |
| desc->ctx_payload = s->buffer.packets[index].buffer; |
| |
| seq_pos = (seq_pos + 1) % seq_size; |
| desc = amdtp_stream_next_packet_desc(s, desc); |
| |
| ++ctx_header; |
| } |
| |
| s->data_block_counter = dbc; |
| s->ctx_data.rx.seq.pos = seq_pos; |
| } |
| |
| static inline void cancel_stream(struct amdtp_stream *s) |
| { |
| s->packet_index = -1; |
| if (in_softirq()) |
| amdtp_stream_pcm_abort(s); |
| WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN); |
| } |
| |
| static snd_pcm_sframes_t compute_pcm_extra_delay(struct amdtp_stream *s, |
| const struct pkt_desc *desc, unsigned int count) |
| { |
| unsigned int data_block_count = 0; |
| u32 latest_cycle; |
| u32 cycle_time; |
| u32 curr_cycle; |
| u32 cycle_gap; |
| int i, err; |
| |
| if (count == 0) |
| goto end; |
| |
| // Forward to the latest record. |
| for (i = 0; i < count - 1; ++i) |
| desc = amdtp_stream_next_packet_desc(s, desc); |
| latest_cycle = desc->cycle; |
| |
| err = fw_card_read_cycle_time(fw_parent_device(s->unit)->card, &cycle_time); |
| if (err < 0) |
| goto end; |
| |
| // Compute cycle count with lower 3 bits of second field and cycle field like timestamp |
| // format of 1394 OHCI isochronous context. |
| curr_cycle = compute_ohci_iso_ctx_cycle_count((cycle_time >> 12) & 0x0000ffff); |
| |
| if (s->direction == AMDTP_IN_STREAM) { |
| // NOTE: The AMDTP packet descriptor should be for the past isochronous cycle since |
| // it corresponds to arrived isochronous packet. |
| if (compare_ohci_cycle_count(latest_cycle, curr_cycle) > 0) |
| goto end; |
| cycle_gap = decrement_ohci_cycle_count(curr_cycle, latest_cycle); |
| |
| // NOTE: estimate delay by recent history of arrived AMDTP packets. The estimated |
| // value expectedly corresponds to a few packets (0-2) since the packet arrived at |
| // the most recent isochronous cycle has been already processed. |
| for (i = 0; i < cycle_gap; ++i) { |
| desc = amdtp_stream_next_packet_desc(s, desc); |
| data_block_count += desc->data_blocks; |
| } |
| } else { |
| // NOTE: The AMDTP packet descriptor should be for the future isochronous cycle |
| // since it was already scheduled. |
| if (compare_ohci_cycle_count(latest_cycle, curr_cycle) < 0) |
| goto end; |
| cycle_gap = decrement_ohci_cycle_count(latest_cycle, curr_cycle); |
| |
| // NOTE: use history of scheduled packets. |
| for (i = 0; i < cycle_gap; ++i) { |
| data_block_count += desc->data_blocks; |
| desc = prev_packet_desc(s, desc); |
| } |
| } |
| end: |
| return data_block_count * s->pcm_frame_multiplier; |
| } |
| |
| static void process_ctx_payloads(struct amdtp_stream *s, |
| const struct pkt_desc *desc, |
| unsigned int count) |
| { |
| struct snd_pcm_substream *pcm; |
| int i; |
| |
| pcm = READ_ONCE(s->pcm); |
| s->process_ctx_payloads(s, desc, count, pcm); |
| |
| if (pcm) { |
| unsigned int data_block_count = 0; |
| |
| pcm->runtime->delay = compute_pcm_extra_delay(s, desc, count); |
| |
| for (i = 0; i < count; ++i) { |
| data_block_count += desc->data_blocks; |
| desc = amdtp_stream_next_packet_desc(s, desc); |
| } |
| |
| update_pcm_pointers(s, pcm, data_block_count * s->pcm_frame_multiplier); |
| } |
| } |
| |
| static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_t header_length, |
| void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| const struct amdtp_domain *d = s->domain; |
| const __be32 *ctx_header = header; |
| const unsigned int events_per_period = d->events_per_period; |
| unsigned int event_count = s->ctx_data.rx.event_count; |
| struct pkt_desc *desc = s->packet_descs_cursor; |
| unsigned int pkt_header_length; |
| unsigned int packets; |
| u32 curr_cycle_time; |
| bool need_hw_irq; |
| int i; |
| |
| if (s->packet_index < 0) |
| return; |
| |
| // Calculate the number of packets in buffer and check XRUN. |
| packets = header_length / sizeof(*ctx_header); |
| |
| generate_rx_packet_descs(s, desc, ctx_header, packets); |
| |
| process_ctx_payloads(s, desc, packets); |
| |
| if (!(s->flags & CIP_NO_HEADER)) |
| pkt_header_length = IT_PKT_HEADER_SIZE_CIP; |
| else |
| pkt_header_length = 0; |
| |
| if (s == d->irq_target) { |
| // At NO_PERIOD_WAKEUP mode, the packets for all IT/IR contexts are processed by |
| // the tasks of user process operating ALSA PCM character device by calling ioctl(2) |
| // with some requests, instead of scheduled hardware IRQ of an IT context. |
| struct snd_pcm_substream *pcm = READ_ONCE(s->pcm); |
| need_hw_irq = !pcm || !pcm->runtime->no_period_wakeup; |
| } else { |
| need_hw_irq = false; |
| } |
| |
| if (trace_amdtp_packet_enabled()) |
| (void)fw_card_read_cycle_time(fw_parent_device(s->unit)->card, &curr_cycle_time); |
| |
| for (i = 0; i < packets; ++i) { |
| DEFINE_RAW_FLEX(struct fw_iso_packet, template, header, CIP_HEADER_QUADLETS); |
| bool sched_irq = false; |
| |
| build_it_pkt_header(s, desc->cycle, template, pkt_header_length, |
| desc->data_blocks, desc->data_block_counter, |
| desc->syt, i, curr_cycle_time); |
| |
| if (s == s->domain->irq_target) { |
| event_count += desc->data_blocks; |
| if (event_count >= events_per_period) { |
| event_count -= events_per_period; |
| sched_irq = need_hw_irq; |
| } |
| } |
| |
| if (queue_out_packet(s, template, sched_irq) < 0) { |
| cancel_stream(s); |
| return; |
| } |
| |
| desc = amdtp_stream_next_packet_desc(s, desc); |
| } |
| |
| s->ctx_data.rx.event_count = event_count; |
| s->packet_descs_cursor = desc; |
| } |
| |
| static void skip_rx_packets(struct fw_iso_context *context, u32 tstamp, size_t header_length, |
| void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| struct amdtp_domain *d = s->domain; |
| const __be32 *ctx_header = header; |
| unsigned int packets; |
| unsigned int cycle; |
| int i; |
| |
| if (s->packet_index < 0) |
| return; |
| |
| packets = header_length / sizeof(*ctx_header); |
| |
| cycle = compute_ohci_it_cycle(ctx_header[packets - 1], s->queue_size); |
| s->next_cycle = increment_ohci_cycle_count(cycle, 1); |
| |
| for (i = 0; i < packets; ++i) { |
| struct fw_iso_packet params = { |
| .header_length = 0, |
| .payload_length = 0, |
| }; |
| bool sched_irq = (s == d->irq_target && i == packets - 1); |
| |
| if (queue_out_packet(s, ¶ms, sched_irq) < 0) { |
| cancel_stream(s); |
| return; |
| } |
| } |
| } |
| |
| static void irq_target_callback(struct fw_iso_context *context, u32 tstamp, size_t header_length, |
| void *header, void *private_data); |
| |
| static void process_rx_packets_intermediately(struct fw_iso_context *context, u32 tstamp, |
| size_t header_length, void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| struct amdtp_domain *d = s->domain; |
| __be32 *ctx_header = header; |
| const unsigned int queue_size = s->queue_size; |
| unsigned int packets; |
| unsigned int offset; |
| |
| if (s->packet_index < 0) |
| return; |
| |
| packets = header_length / sizeof(*ctx_header); |
| |
| offset = 0; |
| while (offset < packets) { |
| unsigned int cycle = compute_ohci_it_cycle(ctx_header[offset], queue_size); |
| |
| if (compare_ohci_cycle_count(cycle, d->processing_cycle.rx_start) >= 0) |
| break; |
| |
| ++offset; |
| } |
| |
| if (offset > 0) { |
| unsigned int length = sizeof(*ctx_header) * offset; |
| |
| skip_rx_packets(context, tstamp, length, ctx_header, private_data); |
| if (amdtp_streaming_error(s)) |
| return; |
| |
| ctx_header += offset; |
| header_length -= length; |
| } |
| |
| if (offset < packets) { |
| s->ready_processing = true; |
| wake_up(&s->ready_wait); |
| |
| if (d->replay.enable) |
| s->ctx_data.rx.cache_pos = 0; |
| |
| process_rx_packets(context, tstamp, header_length, ctx_header, private_data); |
| if (amdtp_streaming_error(s)) |
| return; |
| |
| if (s == d->irq_target) |
| s->context->callback.sc = irq_target_callback; |
| else |
| s->context->callback.sc = process_rx_packets; |
| } |
| } |
| |
| static void process_tx_packets(struct fw_iso_context *context, u32 tstamp, size_t header_length, |
| void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| __be32 *ctx_header = header; |
| struct pkt_desc *desc = s->packet_descs_cursor; |
| unsigned int packet_count; |
| unsigned int desc_count; |
| int i; |
| int err; |
| |
| if (s->packet_index < 0) |
| return; |
| |
| // Calculate the number of packets in buffer and check XRUN. |
| packet_count = header_length / s->ctx_data.tx.ctx_header_size; |
| |
| desc_count = 0; |
| err = generate_tx_packet_descs(s, desc, ctx_header, packet_count, &desc_count); |
| if (err < 0) { |
| if (err != -EAGAIN) { |
| cancel_stream(s); |
| return; |
| } |
| } else { |
| struct amdtp_domain *d = s->domain; |
| |
| process_ctx_payloads(s, desc, desc_count); |
| |
| if (d->replay.enable) |
| cache_seq(s, desc, desc_count); |
| |
| for (i = 0; i < desc_count; ++i) |
| desc = amdtp_stream_next_packet_desc(s, desc); |
| s->packet_descs_cursor = desc; |
| } |
| |
| for (i = 0; i < packet_count; ++i) { |
| struct fw_iso_packet params = {0}; |
| |
| if (queue_in_packet(s, ¶ms) < 0) { |
| cancel_stream(s); |
| return; |
| } |
| } |
| } |
| |
| static void drop_tx_packets(struct fw_iso_context *context, u32 tstamp, size_t header_length, |
| void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| const __be32 *ctx_header = header; |
| unsigned int packets; |
| unsigned int cycle; |
| int i; |
| |
| if (s->packet_index < 0) |
| return; |
| |
| packets = header_length / s->ctx_data.tx.ctx_header_size; |
| |
| ctx_header += (packets - 1) * s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header); |
| cycle = compute_ohci_cycle_count(ctx_header[1]); |
| s->next_cycle = increment_ohci_cycle_count(cycle, 1); |
| |
| for (i = 0; i < packets; ++i) { |
| struct fw_iso_packet params = {0}; |
| |
| if (queue_in_packet(s, ¶ms) < 0) { |
| cancel_stream(s); |
| return; |
| } |
| } |
| } |
| |
| static void process_tx_packets_intermediately(struct fw_iso_context *context, u32 tstamp, |
| size_t header_length, void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| struct amdtp_domain *d = s->domain; |
| __be32 *ctx_header; |
| unsigned int packets; |
| unsigned int offset; |
| |
| if (s->packet_index < 0) |
| return; |
| |
| packets = header_length / s->ctx_data.tx.ctx_header_size; |
| |
| offset = 0; |
| ctx_header = header; |
| while (offset < packets) { |
| unsigned int cycle = compute_ohci_cycle_count(ctx_header[1]); |
| |
| if (compare_ohci_cycle_count(cycle, d->processing_cycle.tx_start) >= 0) |
| break; |
| |
| ctx_header += s->ctx_data.tx.ctx_header_size / sizeof(__be32); |
| ++offset; |
| } |
| |
| ctx_header = header; |
| |
| if (offset > 0) { |
| size_t length = s->ctx_data.tx.ctx_header_size * offset; |
| |
| drop_tx_packets(context, tstamp, length, ctx_header, s); |
| if (amdtp_streaming_error(s)) |
| return; |
| |
| ctx_header += length / sizeof(*ctx_header); |
| header_length -= length; |
| } |
| |
| if (offset < packets) { |
| s->ready_processing = true; |
| wake_up(&s->ready_wait); |
| |
| process_tx_packets(context, tstamp, header_length, ctx_header, s); |
| if (amdtp_streaming_error(s)) |
| return; |
| |
| context->callback.sc = process_tx_packets; |
| } |
| } |
| |
| static void drop_tx_packets_initially(struct fw_iso_context *context, u32 tstamp, |
| size_t header_length, void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| struct amdtp_domain *d = s->domain; |
| __be32 *ctx_header; |
| unsigned int count; |
| unsigned int events; |
| int i; |
| |
| if (s->packet_index < 0) |
| return; |
| |
| count = header_length / s->ctx_data.tx.ctx_header_size; |
| |
| // Attempt to detect any event in the batch of packets. |
| events = 0; |
| ctx_header = header; |
| for (i = 0; i < count; ++i) { |
| unsigned int payload_quads = |
| (be32_to_cpu(*ctx_header) >> ISO_DATA_LENGTH_SHIFT) / sizeof(__be32); |
| unsigned int data_blocks; |
| |
| if (s->flags & CIP_NO_HEADER) { |
| data_blocks = payload_quads / s->data_block_quadlets; |
| } else { |
| __be32 *cip_headers = ctx_header + IR_CTX_HEADER_DEFAULT_QUADLETS; |
| |
| if (payload_quads < CIP_HEADER_QUADLETS) { |
| data_blocks = 0; |
| } else { |
| payload_quads -= CIP_HEADER_QUADLETS; |
| |
| if (s->flags & CIP_UNAWARE_SYT) { |
| data_blocks = payload_quads / s->data_block_quadlets; |
| } else { |
| u32 cip1 = be32_to_cpu(cip_headers[1]); |
| |
| // NODATA packet can includes any data blocks but they are |
| // not available as event. |
| if ((cip1 & CIP_NO_DATA) == CIP_NO_DATA) |
| data_blocks = 0; |
| else |
| data_blocks = payload_quads / s->data_block_quadlets; |
| } |
| } |
| } |
| |
| events += data_blocks; |
| |
| ctx_header += s->ctx_data.tx.ctx_header_size / sizeof(__be32); |
| } |
| |
| drop_tx_packets(context, tstamp, header_length, header, s); |
| |
| if (events > 0) |
| s->ctx_data.tx.event_starts = true; |
| |
| // Decide the cycle count to begin processing content of packet in IR contexts. |
| { |
| unsigned int stream_count = 0; |
| unsigned int event_starts_count = 0; |
| unsigned int cycle = UINT_MAX; |
| |
| list_for_each_entry(s, &d->streams, list) { |
| if (s->direction == AMDTP_IN_STREAM) { |
| ++stream_count; |
| if (s->ctx_data.tx.event_starts) |
| ++event_starts_count; |
| } |
| } |
| |
| if (stream_count == event_starts_count) { |
| unsigned int next_cycle; |
| |
| list_for_each_entry(s, &d->streams, list) { |
| if (s->direction != AMDTP_IN_STREAM) |
| continue; |
| |
| next_cycle = increment_ohci_cycle_count(s->next_cycle, |
| d->processing_cycle.tx_init_skip); |
| if (cycle == UINT_MAX || |
| compare_ohci_cycle_count(next_cycle, cycle) > 0) |
| cycle = next_cycle; |
| |
| s->context->callback.sc = process_tx_packets_intermediately; |
| } |
| |
| d->processing_cycle.tx_start = cycle; |
| } |
| } |
| } |
| |
| static void process_ctxs_in_domain(struct amdtp_domain *d) |
| { |
| struct amdtp_stream *s; |
| |
| list_for_each_entry(s, &d->streams, list) { |
| if (s != d->irq_target && amdtp_stream_running(s)) |
| fw_iso_context_flush_completions(s->context); |
| |
| if (amdtp_streaming_error(s)) |
| goto error; |
| } |
| |
| return; |
| error: |
| if (amdtp_stream_running(d->irq_target)) |
| cancel_stream(d->irq_target); |
| |
| list_for_each_entry(s, &d->streams, list) { |
| if (amdtp_stream_running(s)) |
| cancel_stream(s); |
| } |
| } |
| |
| static void irq_target_callback(struct fw_iso_context *context, u32 tstamp, size_t header_length, |
| void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| struct amdtp_domain *d = s->domain; |
| |
| process_rx_packets(context, tstamp, header_length, header, private_data); |
| process_ctxs_in_domain(d); |
| } |
| |
| static void irq_target_callback_intermediately(struct fw_iso_context *context, u32 tstamp, |
| size_t header_length, void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| struct amdtp_domain *d = s->domain; |
| |
| process_rx_packets_intermediately(context, tstamp, header_length, header, private_data); |
| process_ctxs_in_domain(d); |
| } |
| |
| static void irq_target_callback_skip(struct fw_iso_context *context, u32 tstamp, |
| size_t header_length, void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| struct amdtp_domain *d = s->domain; |
| bool ready_to_start; |
| |
| skip_rx_packets(context, tstamp, header_length, header, private_data); |
| process_ctxs_in_domain(d); |
| |
| if (d->replay.enable && !d->replay.on_the_fly) { |
| unsigned int rx_count = 0; |
| unsigned int rx_ready_count = 0; |
| struct amdtp_stream *rx; |
| |
| list_for_each_entry(rx, &d->streams, list) { |
| struct amdtp_stream *tx; |
| unsigned int cached_cycles; |
| |
| if (rx->direction != AMDTP_OUT_STREAM) |
| continue; |
| ++rx_count; |
| |
| tx = rx->ctx_data.rx.replay_target; |
| cached_cycles = calculate_cached_cycle_count(tx, 0); |
| if (cached_cycles > tx->ctx_data.tx.cache.size / 2) |
| ++rx_ready_count; |
| } |
| |
| ready_to_start = (rx_count == rx_ready_count); |
| } else { |
| ready_to_start = true; |
| } |
| |
| // Decide the cycle count to begin processing content of packet in IT contexts. All of IT |
| // contexts are expected to start and get callback when reaching here. |
| if (ready_to_start) { |
| unsigned int cycle = s->next_cycle; |
| list_for_each_entry(s, &d->streams, list) { |
| if (s->direction != AMDTP_OUT_STREAM) |
| continue; |
| |
| if (compare_ohci_cycle_count(s->next_cycle, cycle) > 0) |
| cycle = s->next_cycle; |
| |
| if (s == d->irq_target) |
| s->context->callback.sc = irq_target_callback_intermediately; |
| else |
| s->context->callback.sc = process_rx_packets_intermediately; |
| } |
| |
| d->processing_cycle.rx_start = cycle; |
| } |
| } |
| |
| // This is executed one time. For in-stream, first packet has come. For out-stream, prepared to |
| // transmit first packet. |
| static void amdtp_stream_first_callback(struct fw_iso_context *context, |
| u32 tstamp, size_t header_length, |
| void *header, void *private_data) |
| { |
| struct amdtp_stream *s = private_data; |
| struct amdtp_domain *d = s->domain; |
| |
| if (s->direction == AMDTP_IN_STREAM) { |
| context->callback.sc = drop_tx_packets_initially; |
| } else { |
| if (s == d->irq_target) |
| context->callback.sc = irq_target_callback_skip; |
| else |
| context->callback.sc = skip_rx_packets; |
| } |
| |
| context->callback.sc(context, tstamp, header_length, header, s); |
| } |
| |
| /** |
| * amdtp_stream_start - start transferring packets |
| * @s: the AMDTP stream to start |
| * @channel: the isochronous channel on the bus |
| * @speed: firewire speed code |
| * @queue_size: The number of packets in the queue. |
| * @idle_irq_interval: the interval to queue packet during initial state. |
| * |
| * The stream cannot be started until it has been configured with |
| * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
| * device can be started. |
| */ |
| static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed, |
| unsigned int queue_size, unsigned int idle_irq_interval) |
| { |
| bool is_irq_target = (s == s->domain->irq_target); |
| unsigned int ctx_header_size; |
| unsigned int max_ctx_payload_size; |
| enum dma_data_direction dir; |
| struct pkt_desc *descs; |
| int i, type, tag, err; |
| |
| mutex_lock(&s->mutex); |
| |
| if (WARN_ON(amdtp_stream_running(s) || |
| (s->data_block_quadlets < 1))) { |
| err = -EBADFD; |
| goto err_unlock; |
| } |
| |
| if (s->direction == AMDTP_IN_STREAM) { |
| // NOTE: IT context should be used for constant IRQ. |
| if (is_irq_target) { |
| err = -EINVAL; |
| goto err_unlock; |
| } |
| |
| s->data_block_counter = UINT_MAX; |
| } else { |
| s->data_block_counter = 0; |
| } |
| |
| // initialize packet buffer. |
| if (s->direction == AMDTP_IN_STREAM) { |
| dir = DMA_FROM_DEVICE; |
| type = FW_ISO_CONTEXT_RECEIVE; |
| if (!(s->flags & CIP_NO_HEADER)) |
| ctx_header_size = IR_CTX_HEADER_SIZE_CIP; |
| else |
| ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP; |
| } else { |
| dir = DMA_TO_DEVICE; |
| type = FW_ISO_CONTEXT_TRANSMIT; |
| ctx_header_size = 0; // No effect for IT context. |
| } |
| max_ctx_payload_size = amdtp_stream_get_max_ctx_payload_size(s); |
| |
| err = iso_packets_buffer_init(&s->buffer, s->unit, queue_size, max_ctx_payload_size, dir); |
| if (err < 0) |
| goto err_unlock; |
| s->queue_size = queue_size; |
| |
| s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, |
| type, channel, speed, ctx_header_size, |
| amdtp_stream_first_callback, s); |
| if (IS_ERR(s->context)) { |
| err = PTR_ERR(s->context); |
| if (err == -EBUSY) |
| dev_err(&s->unit->device, |
| "no free stream on this controller\n"); |
| goto err_buffer; |
| } |
| |
| amdtp_stream_update(s); |
| |
| if (s->direction == AMDTP_IN_STREAM) { |
| s->ctx_data.tx.max_ctx_payload_length = max_ctx_payload_size; |
| s->ctx_data.tx.ctx_header_size = ctx_header_size; |
| s->ctx_data.tx.event_starts = false; |
| |
| if (s->domain->replay.enable) { |
| // struct fw_iso_context.drop_overflow_headers is false therefore it's |
| // possible to cache much unexpectedly. |
| s->ctx_data.tx.cache.size = max_t(unsigned int, s->syt_interval * 2, |
| queue_size * 3 / 2); |
| s->ctx_data.tx.cache.pos = 0; |
| s->ctx_data.tx.cache.descs = kcalloc(s->ctx_data.tx.cache.size, |
| sizeof(*s->ctx_data.tx.cache.descs), GFP_KERNEL); |
| if (!s->ctx_data.tx.cache.descs) { |
| err = -ENOMEM; |
| goto err_context; |
| } |
| } |
| } else { |
| static const struct { |
| unsigned int data_block; |
| unsigned int syt_offset; |
| } *entry, initial_state[] = { |
| [CIP_SFC_32000] = { 4, 3072 }, |
| [CIP_SFC_48000] = { 6, 1024 }, |
| [CIP_SFC_96000] = { 12, 1024 }, |
| [CIP_SFC_192000] = { 24, 1024 }, |
| [CIP_SFC_44100] = { 0, 67 }, |
| [CIP_SFC_88200] = { 0, 67 }, |
| [CIP_SFC_176400] = { 0, 67 }, |
| }; |
| |
| s->ctx_data.rx.seq.descs = kcalloc(queue_size, sizeof(*s->ctx_data.rx.seq.descs), GFP_KERNEL); |
| if (!s->ctx_data.rx.seq.descs) { |
| err = -ENOMEM; |
| goto err_context; |
| } |
| s->ctx_data.rx.seq.size = queue_size; |
| s->ctx_data.rx.seq.pos = 0; |
| |
| entry = &initial_state[s->sfc]; |
| s->ctx_data.rx.data_block_state = entry->data_block; |
| s->ctx_data.rx.syt_offset_state = entry->syt_offset; |
| s->ctx_data.rx.last_syt_offset = TICKS_PER_CYCLE; |
| |
| s->ctx_data.rx.event_count = 0; |
| } |
| |
| if (s->flags & CIP_NO_HEADER) |
| s->tag = TAG_NO_CIP_HEADER; |
| else |
| s->tag = TAG_CIP; |
| |
| // NOTE: When operating without hardIRQ/softIRQ, applications tends to call ioctl request |
| // for runtime of PCM substream in the interval equivalent to the size of PCM buffer. It |
| // could take a round over queue of AMDTP packet descriptors and small loss of history. For |
| // safe, keep more 8 elements for the queue, equivalent to 1 ms. |
| descs = kcalloc(s->queue_size + 8, sizeof(*descs), GFP_KERNEL); |
| if (!descs) { |
| err = -ENOMEM; |
| goto err_context; |
| } |
| s->packet_descs = descs; |
| |
| INIT_LIST_HEAD(&s->packet_descs_list); |
| for (i = 0; i < s->queue_size; ++i) { |
| INIT_LIST_HEAD(&descs->link); |
| list_add_tail(&descs->link, &s->packet_descs_list); |
| ++descs; |
| } |
| s->packet_descs_cursor = list_first_entry(&s->packet_descs_list, struct pkt_desc, link); |
| |
| s->packet_index = 0; |
| do { |
| struct fw_iso_packet params; |
| |
| if (s->direction == AMDTP_IN_STREAM) { |
| err = queue_in_packet(s, ¶ms); |
| } else { |
| bool sched_irq = false; |
| |
| params.header_length = 0; |
| params.payload_length = 0; |
| |
| if (is_irq_target) { |
| sched_irq = !((s->packet_index + 1) % |
| idle_irq_interval); |
| } |
| |
| err = queue_out_packet(s, ¶ms, sched_irq); |
| } |
| if (err < 0) |
| goto err_pkt_descs; |
| } while (s->packet_index > 0); |
| |
| /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
| tag = FW_ISO_CONTEXT_MATCH_TAG1; |
| if ((s->flags & CIP_EMPTY_WITH_TAG0) || (s->flags & CIP_NO_HEADER)) |
| tag |= FW_ISO_CONTEXT_MATCH_TAG0; |
| |
| s->ready_processing = false; |
| err = fw_iso_context_start(s->context, -1, 0, tag); |
| if (err < 0) |
| goto err_pkt_descs; |
| |
| mutex_unlock(&s->mutex); |
| |
| return 0; |
| err_pkt_descs: |
| kfree(s->packet_descs); |
| s->packet_descs = NULL; |
| err_context: |
| if (s->direction == AMDTP_OUT_STREAM) { |
| kfree(s->ctx_data.rx.seq.descs); |
| } else { |
| if (s->domain->replay.enable) |
| kfree(s->ctx_data.tx.cache.descs); |
| } |
| fw_iso_context_destroy(s->context); |
| s->context = ERR_PTR(-1); |
| err_buffer: |
| iso_packets_buffer_destroy(&s->buffer, s->unit); |
| err_unlock: |
| mutex_unlock(&s->mutex); |
| |
| return err; |
| } |
| |
| /** |
| * amdtp_domain_stream_pcm_pointer - get the PCM buffer position |
| * @d: the AMDTP domain. |
| * @s: the AMDTP stream that transports the PCM data |
| * |
| * Returns the current buffer position, in frames. |
| */ |
| unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d, |
| struct amdtp_stream *s) |
| { |
| struct amdtp_stream *irq_target = d->irq_target; |
| |
| // Process isochronous packets queued till recent isochronous cycle to handle PCM frames. |
| if (irq_target && amdtp_stream_running(irq_target)) { |
| // In software IRQ context, the call causes dead-lock to disable the tasklet |
| // synchronously. |
| if (!in_softirq()) |
| fw_iso_context_flush_completions(irq_target->context); |
| } |
| |
| return READ_ONCE(s->pcm_buffer_pointer); |
| } |
| EXPORT_SYMBOL_GPL(amdtp_domain_stream_pcm_pointer); |
| |
| /** |
| * amdtp_domain_stream_pcm_ack - acknowledge queued PCM frames |
| * @d: the AMDTP domain. |
| * @s: the AMDTP stream that transfers the PCM frames |
| * |
| * Returns zero always. |
| */ |
| int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s) |
| { |
| struct amdtp_stream *irq_target = d->irq_target; |
| |
| // Process isochronous packets for recent isochronous cycle to handle |
| // queued PCM frames. |
| if (irq_target && amdtp_stream_running(irq_target)) |
| fw_iso_context_flush_completions(irq_target->context); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(amdtp_domain_stream_pcm_ack); |
| |
| /** |
| * amdtp_stream_update - update the stream after a bus reset |
| * @s: the AMDTP stream |
| */ |
| void amdtp_stream_update(struct amdtp_stream *s) |
| { |
| /* Precomputing. */ |
| WRITE_ONCE(s->source_node_id_field, |
| (fw_parent_device(s->unit)->card->node_id << CIP_SID_SHIFT) & CIP_SID_MASK); |
| } |
| EXPORT_SYMBOL(amdtp_stream_update); |
| |
| /** |
| * amdtp_stream_stop - stop sending packets |
| * @s: the AMDTP stream to stop |
| * |
| * All PCM and MIDI devices of the stream must be stopped before the stream |
| * itself can be stopped. |
| */ |
| static void amdtp_stream_stop(struct amdtp_stream *s) |
| { |
| mutex_lock(&s->mutex); |
| |
| if (!amdtp_stream_running(s)) { |
| mutex_unlock(&s->mutex); |
| return; |
| } |
| |
| fw_iso_context_stop(s->context); |
| fw_iso_context_destroy(s->context); |
| s->context = ERR_PTR(-1); |
| iso_packets_buffer_destroy(&s->buffer, s->unit); |
| kfree(s->packet_descs); |
| s->packet_descs = NULL; |
| |
| if (s->direction == AMDTP_OUT_STREAM) { |
| kfree(s->ctx_data.rx.seq.descs); |
| } else { |
| if (s->domain->replay.enable) |
| kfree(s->ctx_data.tx.cache.descs); |
| } |
| |
| mutex_unlock(&s->mutex); |
| } |
| |
| /** |
| * amdtp_stream_pcm_abort - abort the running PCM device |
| * @s: the AMDTP stream about to be stopped |
| * |
| * If the isochronous stream needs to be stopped asynchronously, call this |
| * function first to stop the PCM device. |
| */ |
| void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
| { |
| struct snd_pcm_substream *pcm; |
| |
| pcm = READ_ONCE(s->pcm); |
| if (pcm) |
| snd_pcm_stop_xrun(pcm); |
| } |
| EXPORT_SYMBOL(amdtp_stream_pcm_abort); |
| |
| /** |
| * amdtp_domain_init - initialize an AMDTP domain structure |
| * @d: the AMDTP domain to initialize. |
| */ |
| int amdtp_domain_init(struct amdtp_domain *d) |
| { |
| INIT_LIST_HEAD(&d->streams); |
| |
| d->events_per_period = 0; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(amdtp_domain_init); |
| |
| /** |
| * amdtp_domain_destroy - destroy an AMDTP domain structure |
| * @d: the AMDTP domain to destroy. |
| */ |
| void amdtp_domain_destroy(struct amdtp_domain *d) |
| { |
| // At present nothing to do. |
| return; |
| } |
| EXPORT_SYMBOL_GPL(amdtp_domain_destroy); |
| |
| /** |
| * amdtp_domain_add_stream - register isoc context into the domain. |
| * @d: the AMDTP domain. |
| * @s: the AMDTP stream. |
| * @channel: the isochronous channel on the bus. |
| * @speed: firewire speed code. |
| */ |
| int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s, |
| int channel, int speed) |
| { |
| struct amdtp_stream *tmp; |
| |
| list_for_each_entry(tmp, &d->streams, list) { |
| if (s == tmp) |
| return -EBUSY; |
| } |
| |
| list_add(&s->list, &d->streams); |
| |
| s->channel = channel; |
| s->speed = speed; |
| s->domain = d; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(amdtp_domain_add_stream); |
| |
| // Make the reference from rx stream to tx stream for sequence replay. When the number of tx streams |
| // is less than the number of rx streams, the first tx stream is selected. |
| static int make_association(struct amdtp_domain *d) |
| { |
| unsigned int dst_index = 0; |
| struct amdtp_stream *rx; |
| |
| // Make association to replay target. |
| list_for_each_entry(rx, &d->streams, list) { |
| if (rx->direction == AMDTP_OUT_STREAM) { |
| unsigned int src_index = 0; |
| struct amdtp_stream *tx = NULL; |
| struct amdtp_stream *s; |
| |
| list_for_each_entry(s, &d->streams, list) { |
| if (s->direction == AMDTP_IN_STREAM) { |
| if (dst_index == src_index) { |
| tx = s; |
| break; |
| } |
| |
| ++src_index; |
| } |
| } |
| if (!tx) { |
| // Select the first entry. |
| list_for_each_entry(s, &d->streams, list) { |
| if (s->direction == AMDTP_IN_STREAM) { |
| tx = s; |
| break; |
| } |
| } |
| // No target is available to replay sequence. |
| if (!tx) |
| return -EINVAL; |
| } |
| |
| rx->ctx_data.rx.replay_target = tx; |
| |
| ++dst_index; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * amdtp_domain_start - start sending packets for isoc context in the domain. |
| * @d: the AMDTP domain. |
| * @tx_init_skip_cycles: the number of cycles to skip processing packets at initial stage of IR |
| * contexts. |
| * @replay_seq: whether to replay the sequence of packet in IR context for the sequence of packet in |
| * IT context. |
| * @replay_on_the_fly: transfer rx packets according to nominal frequency, then begin to replay |
| * according to arrival of events in tx packets. |
| */ |
| int amdtp_domain_start(struct amdtp_domain *d, unsigned int tx_init_skip_cycles, bool replay_seq, |
| bool replay_on_the_fly) |
| { |
| unsigned int events_per_buffer = d->events_per_buffer; |
| unsigned int events_per_period = d->events_per_period; |
| unsigned int queue_size; |
| struct amdtp_stream *s; |
| bool found = false; |
| int err; |
| |
| if (replay_seq) { |
| err = make_association(d); |
| if (err < 0) |
| return err; |
| } |
| d->replay.enable = replay_seq; |
| d->replay.on_the_fly = replay_on_the_fly; |
| |
| // Select an IT context as IRQ target. |
| list_for_each_entry(s, &d->streams, list) { |
| if (s->direction == AMDTP_OUT_STREAM) { |
| found = true; |
| break; |
| } |
| } |
| if (!found) |
| return -ENXIO; |
| d->irq_target = s; |
| |
| d->processing_cycle.tx_init_skip = tx_init_skip_cycles; |
| |
| // This is a case that AMDTP streams in domain run just for MIDI |
| // substream. Use the number of events equivalent to 10 msec as |
| // interval of hardware IRQ. |
| if (events_per_period == 0) |
| events_per_period = amdtp_rate_table[d->irq_target->sfc] / 100; |
| if (events_per_buffer == 0) |
| events_per_buffer = events_per_period * 3; |
| |
| queue_size = DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_buffer, |
| amdtp_rate_table[d->irq_target->sfc]); |
| |
| list_for_each_entry(s, &d->streams, list) { |
| unsigned int idle_irq_interval = 0; |
| |
| if (s->direction == AMDTP_OUT_STREAM && s == d->irq_target) { |
| idle_irq_interval = DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_period, |
| amdtp_rate_table[d->irq_target->sfc]); |
| } |
| |
| // Starts immediately but actually DMA context starts several hundred cycles later. |
| err = amdtp_stream_start(s, s->channel, s->speed, queue_size, idle_irq_interval); |
| if (err < 0) |
| goto error; |
| } |
| |
| return 0; |
| error: |
| list_for_each_entry(s, &d->streams, list) |
| amdtp_stream_stop(s); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(amdtp_domain_start); |
| |
| /** |
| * amdtp_domain_stop - stop sending packets for isoc context in the same domain. |
| * @d: the AMDTP domain to which the isoc contexts belong. |
| */ |
| void amdtp_domain_stop(struct amdtp_domain *d) |
| { |
| struct amdtp_stream *s, *next; |
| |
| if (d->irq_target) |
| amdtp_stream_stop(d->irq_target); |
| |
| list_for_each_entry_safe(s, next, &d->streams, list) { |
| list_del(&s->list); |
| |
| if (s != d->irq_target) |
| amdtp_stream_stop(s); |
| } |
| |
| d->events_per_period = 0; |
| d->irq_target = NULL; |
| } |
| EXPORT_SYMBOL_GPL(amdtp_domain_stop); |