428 lines
10 KiB
C
428 lines
10 KiB
C
/*
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* amdtp-motu.c - a part of driver for MOTU FireWire series
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*
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* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include <linux/slab.h>
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#include <sound/pcm.h>
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#include "motu.h"
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#define CREATE_TRACE_POINTS
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#include "amdtp-motu-trace.h"
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#define CIP_FMT_MOTU 0x02
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#define CIP_FMT_MOTU_TX_V3 0x22
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#define MOTU_FDF_AM824 0x22
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/*
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* Nominally 3125 bytes/second, but the MIDI port's clock might be
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* 1% too slow, and the bus clock 100 ppm too fast.
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*/
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#define MIDI_BYTES_PER_SECOND 3093
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struct amdtp_motu {
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/* For timestamp processing. */
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unsigned int quotient_ticks_per_event;
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unsigned int remainder_ticks_per_event;
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unsigned int next_ticks;
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unsigned int next_accumulated;
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unsigned int next_cycles;
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unsigned int next_seconds;
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unsigned int pcm_chunks;
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unsigned int pcm_byte_offset;
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struct snd_rawmidi_substream *midi;
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unsigned int midi_ports;
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unsigned int midi_flag_offset;
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unsigned int midi_byte_offset;
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int midi_db_count;
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unsigned int midi_db_interval;
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};
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int amdtp_motu_set_parameters(struct amdtp_stream *s, unsigned int rate,
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unsigned int midi_ports,
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struct snd_motu_packet_format *formats)
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{
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static const struct {
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unsigned int quotient_ticks_per_event;
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unsigned int remainder_ticks_per_event;
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} params[] = {
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[CIP_SFC_44100] = { 557, 123 },
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[CIP_SFC_48000] = { 512, 0 },
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[CIP_SFC_88200] = { 278, 282 },
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[CIP_SFC_96000] = { 256, 0 },
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[CIP_SFC_176400] = { 139, 141 },
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[CIP_SFC_192000] = { 128, 0 },
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};
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struct amdtp_motu *p = s->protocol;
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unsigned int pcm_chunks, data_chunks, data_block_quadlets;
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unsigned int delay;
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unsigned int mode;
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int i, err;
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if (amdtp_stream_running(s))
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return -EBUSY;
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for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
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if (snd_motu_clock_rates[i] == rate) {
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mode = i >> 1;
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break;
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}
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}
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if (i == ARRAY_SIZE(snd_motu_clock_rates))
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return -EINVAL;
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pcm_chunks = formats->fixed_part_pcm_chunks[mode] +
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formats->differed_part_pcm_chunks[mode];
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data_chunks = formats->msg_chunks + pcm_chunks;
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/*
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* Each data block includes SPH in its head. Data chunks follow with
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* 3 byte alignment. Padding follows with zero to conform to quadlet
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* alignment.
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*/
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data_block_quadlets = 1 + DIV_ROUND_UP(data_chunks * 3, 4);
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err = amdtp_stream_set_parameters(s, rate, data_block_quadlets);
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if (err < 0)
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return err;
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p->pcm_chunks = pcm_chunks;
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p->pcm_byte_offset = formats->pcm_byte_offset;
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p->midi_ports = midi_ports;
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p->midi_flag_offset = formats->midi_flag_offset;
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p->midi_byte_offset = formats->midi_byte_offset;
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p->midi_db_count = 0;
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p->midi_db_interval = rate / MIDI_BYTES_PER_SECOND;
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/* IEEE 1394 bus requires. */
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delay = 0x2e00;
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/* For no-data or empty packets to adjust PCM sampling frequency. */
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delay += 8000 * 3072 * s->syt_interval / rate;
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p->next_seconds = 0;
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p->next_cycles = delay / 3072;
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p->quotient_ticks_per_event = params[s->sfc].quotient_ticks_per_event;
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p->remainder_ticks_per_event = params[s->sfc].remainder_ticks_per_event;
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p->next_ticks = delay % 3072;
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p->next_accumulated = 0;
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return 0;
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}
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static void read_pcm_s32(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime,
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__be32 *buffer, unsigned int data_blocks)
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{
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struct amdtp_motu *p = s->protocol;
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unsigned int channels, remaining_frames, i, c;
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u8 *byte;
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u32 *dst;
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channels = p->pcm_chunks;
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dst = (void *)runtime->dma_area +
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frames_to_bytes(runtime, s->pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
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for (i = 0; i < data_blocks; ++i) {
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byte = (u8 *)buffer + p->pcm_byte_offset;
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for (c = 0; c < channels; ++c) {
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*dst = (byte[0] << 24) | (byte[1] << 16) | byte[2];
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byte += 3;
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dst++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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dst = (void *)runtime->dma_area;
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}
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}
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static void write_pcm_s32(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime,
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__be32 *buffer, unsigned int data_blocks)
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{
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struct amdtp_motu *p = s->protocol;
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unsigned int channels, remaining_frames, i, c;
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u8 *byte;
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const u32 *src;
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channels = p->pcm_chunks;
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src = (void *)runtime->dma_area +
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frames_to_bytes(runtime, s->pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
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for (i = 0; i < data_blocks; ++i) {
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byte = (u8 *)buffer + p->pcm_byte_offset;
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for (c = 0; c < channels; ++c) {
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byte[0] = (*src >> 24) & 0xff;
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byte[1] = (*src >> 16) & 0xff;
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byte[2] = (*src >> 8) & 0xff;
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byte += 3;
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src++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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src = (void *)runtime->dma_area;
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}
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}
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static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer,
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unsigned int data_blocks)
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{
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struct amdtp_motu *p = s->protocol;
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unsigned int channels, i, c;
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u8 *byte;
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channels = p->pcm_chunks;
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for (i = 0; i < data_blocks; ++i) {
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byte = (u8 *)buffer + p->pcm_byte_offset;
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for (c = 0; c < channels; ++c) {
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byte[0] = 0;
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byte[1] = 0;
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byte[2] = 0;
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byte += 3;
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}
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buffer += s->data_block_quadlets;
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}
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}
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int amdtp_motu_add_pcm_hw_constraints(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime)
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{
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int err;
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/* TODO: how to set an constraint for exactly 24bit PCM sample? */
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err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
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if (err < 0)
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return err;
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return amdtp_stream_add_pcm_hw_constraints(s, runtime);
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}
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void amdtp_motu_midi_trigger(struct amdtp_stream *s, unsigned int port,
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struct snd_rawmidi_substream *midi)
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{
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struct amdtp_motu *p = s->protocol;
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if (port < p->midi_ports)
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WRITE_ONCE(p->midi, midi);
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}
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static void write_midi_messages(struct amdtp_stream *s, __be32 *buffer,
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unsigned int data_blocks)
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{
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struct amdtp_motu *p = s->protocol;
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struct snd_rawmidi_substream *midi = READ_ONCE(p->midi);
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u8 *b;
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int i;
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for (i = 0; i < data_blocks; i++) {
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b = (u8 *)buffer;
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if (midi && p->midi_db_count == 0 &&
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snd_rawmidi_transmit(midi, b + p->midi_byte_offset, 1) == 1) {
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b[p->midi_flag_offset] = 0x01;
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} else {
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b[p->midi_byte_offset] = 0x00;
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b[p->midi_flag_offset] = 0x00;
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}
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buffer += s->data_block_quadlets;
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if (--p->midi_db_count < 0)
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p->midi_db_count = p->midi_db_interval;
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}
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}
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static void read_midi_messages(struct amdtp_stream *s, __be32 *buffer,
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unsigned int data_blocks)
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{
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struct amdtp_motu *p = s->protocol;
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struct snd_rawmidi_substream *midi;
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u8 *b;
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int i;
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for (i = 0; i < data_blocks; i++) {
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b = (u8 *)buffer;
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midi = READ_ONCE(p->midi);
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if (midi && (b[p->midi_flag_offset] & 0x01))
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snd_rawmidi_receive(midi, b + p->midi_byte_offset, 1);
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buffer += s->data_block_quadlets;
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}
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}
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/* For tracepoints. */
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static void __maybe_unused copy_sph(u32 *frames, __be32 *buffer,
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unsigned int data_blocks,
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unsigned int data_block_quadlets)
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{
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unsigned int i;
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for (i = 0; i < data_blocks; ++i) {
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*frames = be32_to_cpu(*buffer);
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buffer += data_block_quadlets;
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frames++;
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}
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}
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/* For tracepoints. */
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static void __maybe_unused copy_message(u64 *frames, __be32 *buffer,
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unsigned int data_blocks,
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unsigned int data_block_quadlets)
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{
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unsigned int i;
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/* This is just for v2/v3 protocol. */
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for (i = 0; i < data_blocks; ++i) {
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*frames = (be32_to_cpu(buffer[1]) << 16) |
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(be32_to_cpu(buffer[2]) >> 16);
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buffer += data_block_quadlets;
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frames++;
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}
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}
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static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
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__be32 *buffer, unsigned int data_blocks,
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unsigned int *syt)
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{
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struct amdtp_motu *p = s->protocol;
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struct snd_pcm_substream *pcm;
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trace_in_data_block_sph(s, data_blocks, buffer);
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trace_in_data_block_message(s, data_blocks, buffer);
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if (p->midi_ports)
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read_midi_messages(s, buffer, data_blocks);
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pcm = READ_ONCE(s->pcm);
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if (data_blocks > 0 && pcm)
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read_pcm_s32(s, pcm->runtime, buffer, data_blocks);
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return data_blocks;
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}
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static inline void compute_next_elapse_from_start(struct amdtp_motu *p)
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{
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p->next_accumulated += p->remainder_ticks_per_event;
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if (p->next_accumulated >= 441) {
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p->next_accumulated -= 441;
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p->next_ticks++;
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}
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p->next_ticks += p->quotient_ticks_per_event;
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if (p->next_ticks >= 3072) {
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p->next_ticks -= 3072;
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p->next_cycles++;
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}
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if (p->next_cycles >= 8000) {
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p->next_cycles -= 8000;
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p->next_seconds++;
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}
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if (p->next_seconds >= 128)
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p->next_seconds -= 128;
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}
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static void write_sph(struct amdtp_stream *s, __be32 *buffer,
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unsigned int data_blocks)
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{
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struct amdtp_motu *p = s->protocol;
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unsigned int next_cycles;
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unsigned int i;
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u32 sph;
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for (i = 0; i < data_blocks; i++) {
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next_cycles = (s->start_cycle + p->next_cycles) % 8000;
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sph = ((next_cycles << 12) | p->next_ticks) & 0x01ffffff;
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*buffer = cpu_to_be32(sph);
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compute_next_elapse_from_start(p);
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buffer += s->data_block_quadlets;
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}
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}
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static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
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__be32 *buffer, unsigned int data_blocks,
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unsigned int *syt)
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{
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struct amdtp_motu *p = (struct amdtp_motu *)s->protocol;
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struct snd_pcm_substream *pcm;
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/* Not used. */
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*syt = 0xffff;
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/* TODO: how to interact control messages between userspace? */
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if (p->midi_ports)
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write_midi_messages(s, buffer, data_blocks);
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pcm = READ_ONCE(s->pcm);
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if (pcm)
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write_pcm_s32(s, pcm->runtime, buffer, data_blocks);
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else
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write_pcm_silence(s, buffer, data_blocks);
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write_sph(s, buffer, data_blocks);
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trace_out_data_block_sph(s, data_blocks, buffer);
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trace_out_data_block_message(s, data_blocks, buffer);
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return data_blocks;
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}
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int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit,
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enum amdtp_stream_direction dir,
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const struct snd_motu_protocol *const protocol)
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{
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amdtp_stream_process_data_blocks_t process_data_blocks;
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int fmt = CIP_FMT_MOTU;
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int flags = CIP_BLOCKING;
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int err;
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if (dir == AMDTP_IN_STREAM) {
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process_data_blocks = process_tx_data_blocks;
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/*
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* Units of version 3 transmits packets with invalid CIP header
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* against IEC 61883-1.
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*/
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if (protocol == &snd_motu_protocol_v3) {
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flags |= CIP_WRONG_DBS |
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CIP_SKIP_DBC_ZERO_CHECK |
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CIP_HEADER_WITHOUT_EOH;
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fmt = CIP_FMT_MOTU_TX_V3;
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}
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} else {
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process_data_blocks = process_rx_data_blocks;
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flags |= CIP_DBC_IS_END_EVENT;
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}
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err = amdtp_stream_init(s, unit, dir, flags, fmt, process_data_blocks,
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sizeof(struct amdtp_motu));
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if (err < 0)
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return err;
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s->sph = 1;
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s->fdf = MOTU_FDF_AM824;
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return 0;
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}
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