486 lines
12 KiB
C
486 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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#define TICKS_PER_CYCLE 3072
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#define CYCLES_PER_SECOND 8000
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#define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND)
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#define CIP_SPH_CYCLE_SHIFT 12
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#define CIP_SPH_CYCLE_MASK 0x01fff000
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#define CIP_SPH_OFFSET_MASK 0x00000fff
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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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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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struct amdtp_motu_cache *cache;
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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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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 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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// 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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pcm_chunks = formats->pcm_chunks[mode];
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data_chunks = formats->msg_chunks + pcm_chunks;
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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, 1);
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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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return 0;
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}
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static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int data_blocks,
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unsigned int pcm_frames)
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{
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struct amdtp_motu *p = s->protocol;
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unsigned int channels = p->pcm_chunks;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int pcm_buffer_pointer;
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int remaining_frames;
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u8 *byte;
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u32 *dst;
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int i, c;
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pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
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pcm_buffer_pointer %= runtime->buffer_size;
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dst = (void *)runtime->dma_area +
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frames_to_bytes(runtime, pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - 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) |
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(byte[1] << 16) |
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(byte[2] << 8);
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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, struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int data_blocks,
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unsigned int pcm_frames)
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{
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struct amdtp_motu *p = s->protocol;
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unsigned int channels = p->pcm_chunks;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int pcm_buffer_pointer;
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int remaining_frames;
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u8 *byte;
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const u32 *src;
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int i, c;
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pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
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pcm_buffer_pointer %= runtime->buffer_size;
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src = (void *)runtime->dma_area +
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frames_to_bytes(runtime, pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - 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]);
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*frames <<= 16;
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*frames |= be32_to_cpu(buffer[2]) >> 16;
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++frames;
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buffer += data_block_quadlets;
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}
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}
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static void probe_tracepoints_events(struct amdtp_stream *s, const struct pkt_desc *desc,
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unsigned int count)
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{
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int i;
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for (i = 0; i < count; ++i) {
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__be32 *buf = desc->ctx_payload;
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unsigned int data_blocks = desc->data_blocks;
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trace_data_block_sph(s, data_blocks, buf);
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trace_data_block_message(s, data_blocks, buf);
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desc = amdtp_stream_next_packet_desc(s, desc);
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}
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}
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static void cache_event_offsets(struct amdtp_motu_cache *cache, const __be32 *buf,
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unsigned int data_blocks, unsigned int data_block_quadlets)
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{
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unsigned int *event_offsets = cache->event_offsets;
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const unsigned int cache_size = cache->size;
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unsigned int cache_tail = cache->tail;
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unsigned int base_tick = cache->tx_cycle_count * TICKS_PER_CYCLE;
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int i;
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for (i = 0; i < data_blocks; ++i) {
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u32 sph = be32_to_cpu(*buf);
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unsigned int tick;
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tick = ((sph & CIP_SPH_CYCLE_MASK) >> CIP_SPH_CYCLE_SHIFT) * TICKS_PER_CYCLE +
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(sph & CIP_SPH_OFFSET_MASK);
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if (tick < base_tick)
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tick += TICKS_PER_SECOND;
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event_offsets[cache_tail] = tick - base_tick;
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cache_tail = (cache_tail + 1) % cache_size;
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buf += data_block_quadlets;
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}
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cache->tail = cache_tail;
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cache->tx_cycle_count = (cache->tx_cycle_count + 1) % CYCLES_PER_SECOND;
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}
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static void process_ir_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
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unsigned int count, struct snd_pcm_substream *pcm)
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{
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struct snd_motu *motu = container_of(s, struct snd_motu, tx_stream);
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struct amdtp_motu *p = s->protocol;
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const struct pkt_desc *cursor = desc;
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unsigned int pcm_frames = 0;
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int i;
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if (p->cache->tx_cycle_count == UINT_MAX)
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p->cache->tx_cycle_count = (s->domain->processing_cycle.tx_start % CYCLES_PER_SECOND);
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// For data block processing.
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for (i = 0; i < count; ++i) {
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__be32 *buf = desc->ctx_payload;
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unsigned int data_blocks = desc->data_blocks;
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cache_event_offsets(p->cache, buf, data_blocks, s->data_block_quadlets);
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if (pcm) {
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read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
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pcm_frames += data_blocks;
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}
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if (p->midi_ports)
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read_midi_messages(s, buf, data_blocks);
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desc = amdtp_stream_next_packet_desc(s, desc);
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}
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desc = cursor;
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if (motu->spec->flags & SND_MOTU_SPEC_REGISTER_DSP)
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snd_motu_register_dsp_message_parser_parse(s, desc, count);
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else if (motu->spec->flags & SND_MOTU_SPEC_COMMAND_DSP)
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snd_motu_command_dsp_message_parser_parse(s, desc, count);
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// For tracepoints.
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if (trace_data_block_sph_enabled() ||
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trace_data_block_message_enabled())
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probe_tracepoints_events(s, desc, count);
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}
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static void write_sph(struct amdtp_motu_cache *cache, __be32 *buffer, unsigned int data_blocks,
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unsigned int data_block_quadlets)
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{
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unsigned int *event_offsets = cache->event_offsets;
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const unsigned int cache_size = cache->size;
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unsigned int cache_head = cache->head;
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unsigned int base_tick = cache->rx_cycle_count * TICKS_PER_CYCLE;
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int i;
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for (i = 0; i < data_blocks; i++) {
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unsigned int tick = (base_tick + event_offsets[cache_head]) % TICKS_PER_SECOND;
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u32 sph = ((tick / TICKS_PER_CYCLE) << CIP_SPH_CYCLE_SHIFT) | (tick % TICKS_PER_CYCLE);
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*buffer = cpu_to_be32(sph);
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cache_head = (cache_head + 1) % cache_size;
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buffer += data_block_quadlets;
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}
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cache->head = cache_head;
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cache->rx_cycle_count = (cache->rx_cycle_count + 1) % CYCLES_PER_SECOND;
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}
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static void process_it_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
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unsigned int count, struct snd_pcm_substream *pcm)
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{
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struct amdtp_motu *p = s->protocol;
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const struct pkt_desc *cursor = desc;
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unsigned int pcm_frames = 0;
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int i;
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if (p->cache->rx_cycle_count == UINT_MAX)
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p->cache->rx_cycle_count = (s->domain->processing_cycle.rx_start % CYCLES_PER_SECOND);
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// For data block processing.
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for (i = 0; i < count; ++i) {
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__be32 *buf = desc->ctx_payload;
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unsigned int data_blocks = desc->data_blocks;
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if (pcm) {
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write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
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pcm_frames += data_blocks;
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} else {
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write_pcm_silence(s, buf, data_blocks);
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}
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if (p->midi_ports)
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write_midi_messages(s, buf, data_blocks);
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write_sph(p->cache, buf, data_blocks, s->data_block_quadlets);
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desc = amdtp_stream_next_packet_desc(s, desc);
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}
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desc = cursor;
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// For tracepoints.
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if (trace_data_block_sph_enabled() ||
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trace_data_block_message_enabled())
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probe_tracepoints_events(s, desc, count);
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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_spec *spec, struct amdtp_motu_cache *cache)
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{
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amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
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int fmt = CIP_FMT_MOTU;
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unsigned int flags = CIP_BLOCKING | CIP_UNAWARE_SYT;
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struct amdtp_motu *p;
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int err;
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if (dir == AMDTP_IN_STREAM) {
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process_ctx_payloads = process_ir_ctx_payloads;
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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 (spec->protocol_version == 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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if (spec == &snd_motu_spec_8pre ||
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spec == &snd_motu_spec_ultralite) {
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// 8pre has some quirks.
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flags |= CIP_WRONG_DBS |
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CIP_SKIP_DBC_ZERO_CHECK;
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}
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} else {
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process_ctx_payloads = process_it_ctx_payloads;
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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_ctx_payloads,
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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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if (dir == AMDTP_OUT_STREAM) {
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// Use fixed value for FDF field.
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s->ctx_data.rx.fdf = MOTU_FDF_AM824;
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}
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p = s->protocol;
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p->cache = cache;
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return 0;
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}
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