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