linux/sound/firewire/motu/amdtp-motu.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * amdtp-motu.c - a part of driver for MOTU FireWire series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto <[email protected]>
 */

#include <linux/slab.h>
#include <sound/pcm.h>
#include "motu.h"

#define CREATE_TRACE_POINTS
#include "amdtp-motu-trace.h"

#define CIP_FMT_MOTU …
#define CIP_FMT_MOTU_TX_V3 …
#define MOTU_FDF_AM824 …

#define TICKS_PER_CYCLE …
#define CYCLES_PER_SECOND …
#define TICKS_PER_SECOND …

#define CIP_SPH_CYCLE_SHIFT …
#define CIP_SPH_CYCLE_MASK …
#define CIP_SPH_OFFSET_MASK …

/*
 * Nominally 3125 bytes/second, but the MIDI port's clock might be
 * 1% too slow, and the bus clock 100 ppm too fast.
 */
#define MIDI_BYTES_PER_SECOND …

struct amdtp_motu { … };

int amdtp_motu_set_parameters(struct amdtp_stream *s, unsigned int rate,
			      unsigned int midi_ports,
			      struct snd_motu_packet_format *formats)
{ … }

static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
			 __be32 *buffer, unsigned int data_blocks,
			 unsigned int pcm_frames)
{ … }

static void write_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
			  __be32 *buffer, unsigned int data_blocks,
			  unsigned int pcm_frames)
{ … }

static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer,
			      unsigned int data_blocks)
{ … }

int amdtp_motu_add_pcm_hw_constraints(struct amdtp_stream *s,
				      struct snd_pcm_runtime *runtime)
{ … }

void amdtp_motu_midi_trigger(struct amdtp_stream *s, unsigned int port,
			     struct snd_rawmidi_substream *midi)
{ … }

static void write_midi_messages(struct amdtp_stream *s, __be32 *buffer,
				unsigned int data_blocks)
{ … }

static void read_midi_messages(struct amdtp_stream *s, __be32 *buffer,
			       unsigned int data_blocks)
{ … }

/* For tracepoints. */
static void __maybe_unused copy_sph(u32 *frames, __be32 *buffer,
				    unsigned int data_blocks,
				    unsigned int data_block_quadlets)
{ … }

/* For tracepoints. */
static void __maybe_unused copy_message(u64 *frames, __be32 *buffer,
					unsigned int data_blocks,
					unsigned int data_block_quadlets)
{ … }

static void probe_tracepoints_events(struct amdtp_stream *s, const struct pkt_desc *desc,
				     unsigned int count)
{ … }

static void cache_event_offsets(struct amdtp_motu_cache *cache, const __be32 *buf,
				unsigned int data_blocks, unsigned int data_block_quadlets)
{ … }

static void process_ir_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
				    unsigned int count, struct snd_pcm_substream *pcm)
{ … }

static void write_sph(struct amdtp_motu_cache *cache, __be32 *buffer, unsigned int data_blocks,
		      unsigned int data_block_quadlets)
{ … }

static void process_it_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
				    unsigned int count, struct snd_pcm_substream *pcm)
{ … }

int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit,
		    enum amdtp_stream_direction dir,
		    const struct snd_motu_spec *spec, struct amdtp_motu_cache *cache)
{ … }