diff options
Diffstat (limited to 'sound/firewire/motu/amdtp-motu.c')
| -rw-r--r-- | sound/firewire/motu/amdtp-motu.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/sound/firewire/motu/amdtp-motu.c b/sound/firewire/motu/amdtp-motu.c index 89638e1fbb69..1741ceb381c7 100644 --- a/sound/firewire/motu/amdtp-motu.c +++ b/sound/firewire/motu/amdtp-motu.c @@ -53,6 +53,8 @@ struct amdtp_motu { int midi_db_count; unsigned int midi_db_interval; + + struct amdtp_motu_cache *cache; }; int amdtp_motu_set_parameters(struct amdtp_stream *s, unsigned int rate, @@ -333,6 +335,34 @@ static void probe_tracepoints_events(struct amdtp_stream *s, } } +static void cache_event_offsets(struct amdtp_motu_cache *cache, const __be32 *buf, + unsigned int data_blocks, unsigned int data_block_quadlets) +{ + unsigned int *event_offsets = cache->event_offsets; + const unsigned int cache_size = cache->size; + unsigned int cache_tail = cache->tail; + unsigned int base_tick = cache->tx_cycle_count * TICKS_PER_CYCLE; + int i; + + for (i = 0; i < data_blocks; ++i) { + u32 sph = be32_to_cpu(*buf); + unsigned int tick; + + tick = ((sph & CIP_SPH_CYCLE_MASK) >> CIP_SPH_CYCLE_SHIFT) * TICKS_PER_CYCLE + + (sph & CIP_SPH_OFFSET_MASK); + + if (tick < base_tick) + tick += TICKS_PER_SECOND; + event_offsets[cache_tail] = tick - base_tick; + + cache_tail = (cache_tail + 1) % cache_size; + buf += data_block_quadlets; + } + + cache->tail = cache_tail; + cache->tx_cycle_count = (cache->tx_cycle_count + 1) % CYCLES_PER_SECOND; +} + static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *descs, unsigned int packets, @@ -342,12 +372,17 @@ static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, unsigned int pcm_frames = 0; int i; + if (p->cache->tx_cycle_count == UINT_MAX) + p->cache->tx_cycle_count = (s->domain->processing_cycle.tx_start % CYCLES_PER_SECOND); + // For data block processing. for (i = 0; i < packets; ++i) { const struct pkt_desc *desc = descs + i; __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks; + cache_event_offsets(p->cache, buf, data_blocks, s->data_block_quadlets); + if (pcm) { read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames); pcm_frames += data_blocks; @@ -449,11 +484,12 @@ static unsigned int process_it_ctx_payloads(struct amdtp_stream *s, int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit, enum amdtp_stream_direction dir, - const struct snd_motu_spec *spec) + const struct snd_motu_spec *spec, struct amdtp_motu_cache *cache) { amdtp_stream_process_ctx_payloads_t process_ctx_payloads; int fmt = CIP_FMT_MOTU; unsigned int flags = CIP_BLOCKING | CIP_UNAWARE_SYT; + struct amdtp_motu *p; int err; if (dir == AMDTP_IN_STREAM) { @@ -493,5 +529,8 @@ int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit, s->ctx_data.rx.fdf = MOTU_FDF_AM824; } + p = s->protocol; + p->cache = cache; + return 0; } |