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/*
* dice_stream.c - a part of driver for DICE based devices
*
* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
* Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp>
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "dice.h"
#define CALLBACK_TIMEOUT 200
const unsigned int snd_dice_rates[SND_DICE_RATES_COUNT] = {
/* mode 0 */
[0] = 32000,
[1] = 44100,
[2] = 48000,
/* mode 1 */
[3] = 88200,
[4] = 96000,
/* mode 2 */
[5] = 176400,
[6] = 192000,
};
int snd_dice_stream_get_rate_mode(struct snd_dice *dice, unsigned int rate,
unsigned int *mode)
{
int i;
for (i = 0; i < ARRAY_SIZE(snd_dice_rates); i++) {
if (!(dice->clock_caps & BIT(i)))
continue;
if (snd_dice_rates[i] != rate)
continue;
*mode = (i - 1) / 2;
return 0;
}
return -EINVAL;
}
static void release_resources(struct snd_dice *dice,
struct fw_iso_resources *resources)
{
unsigned int channel;
/* Reset channel number */
channel = cpu_to_be32((u32)-1);
if (resources == &dice->tx_resources)
snd_dice_transaction_write_tx(dice, TX_ISOCHRONOUS,
&channel, 4);
else
snd_dice_transaction_write_rx(dice, RX_ISOCHRONOUS,
&channel, 4);
fw_iso_resources_free(resources);
}
static int keep_resources(struct snd_dice *dice,
struct fw_iso_resources *resources,
unsigned int max_payload_bytes)
{
unsigned int channel;
int err;
err = fw_iso_resources_allocate(resources, max_payload_bytes,
fw_parent_device(dice->unit)->max_speed);
if (err < 0)
goto end;
/* Set channel number */
channel = cpu_to_be32(resources->channel);
if (resources == &dice->tx_resources)
err = snd_dice_transaction_write_tx(dice, TX_ISOCHRONOUS,
&channel, 4);
else
err = snd_dice_transaction_write_rx(dice, RX_ISOCHRONOUS,
&channel, 4);
if (err < 0)
release_resources(dice, resources);
end:
return err;
}
static void stop_stream(struct snd_dice *dice, struct amdtp_stream *stream)
{
amdtp_stream_pcm_abort(stream);
amdtp_stream_stop(stream);
if (stream == &dice->tx_stream)
release_resources(dice, &dice->tx_resources);
else
release_resources(dice, &dice->rx_resources);
}
static int start_stream(struct snd_dice *dice, struct amdtp_stream *stream,
unsigned int rate)
{
struct fw_iso_resources *resources;
unsigned int i, mode, pcm_chs, midi_ports;
bool double_pcm_frames;
int err;
err = snd_dice_stream_get_rate_mode(dice, rate, &mode);
if (err < 0)
goto end;
if (stream == &dice->tx_stream) {
resources = &dice->tx_resources;
pcm_chs = dice->tx_channels[mode];
midi_ports = dice->tx_midi_ports[mode];
} else {
resources = &dice->rx_resources;
pcm_chs = dice->rx_channels[mode];
midi_ports = dice->rx_midi_ports[mode];
}
/*
* At 176.4/192.0 kHz, Dice has a quirk to transfer two PCM frames in
* one data block of AMDTP packet. Thus sampling transfer frequency is
* a half of PCM sampling frequency, i.e. PCM frames at 192.0 kHz are
* transferred on AMDTP packets at 96 kHz. Two successive samples of a
* channel are stored consecutively in the packet. This quirk is called
* as 'Dual Wire'.
* For this quirk, blocking mode is required and PCM buffer size should
* be aligned to SYT_INTERVAL.
*/
double_pcm_frames = mode > 1;
if (double_pcm_frames) {
rate /= 2;
pcm_chs *= 2;
}
err = amdtp_am824_set_parameters(stream, rate, pcm_chs, midi_ports,
double_pcm_frames);
if (err < 0)
goto end;
if (double_pcm_frames) {
pcm_chs /= 2;
for (i = 0; i < pcm_chs; i++) {
stream->pcm_positions[i] = i * 2;
stream->pcm_positions[i + pcm_chs] = i * 2 + 1;
}
}
err = keep_resources(dice, resources,
amdtp_stream_get_max_payload(stream));
if (err < 0) {
dev_err(&dice->unit->device,
"fail to keep isochronous resources\n");
goto end;
}
err = amdtp_stream_start(stream, resources->channel,
fw_parent_device(dice->unit)->max_speed);
if (err < 0)
release_resources(dice, resources);
end:
return err;
}
static int get_sync_mode(struct snd_dice *dice, enum cip_flags *sync_mode)
{
u32 source;
int err;
err = snd_dice_transaction_get_clock_source(dice, &source);
if (err < 0)
goto end;
switch (source) {
/* So-called 'SYT Match' modes, sync_to_syt value of packets received */
case CLOCK_SOURCE_ARX4: /* in 4th stream */
case CLOCK_SOURCE_ARX3: /* in 3rd stream */
case CLOCK_SOURCE_ARX2: /* in 2nd stream */
err = -ENOSYS;
break;
case CLOCK_SOURCE_ARX1: /* in 1st stream, which this driver uses */
*sync_mode = 0;
break;
default:
*sync_mode = CIP_SYNC_TO_DEVICE;
break;
}
end:
return err;
}
int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
{
struct amdtp_stream *master, *slave;
unsigned int curr_rate;
enum cip_flags sync_mode;
int err = 0;
if (dice->substreams_counter == 0)
goto end;
err = get_sync_mode(dice, &sync_mode);
if (err < 0)
goto end;
if (sync_mode == CIP_SYNC_TO_DEVICE) {
master = &dice->tx_stream;
slave = &dice->rx_stream;
} else {
master = &dice->rx_stream;
slave = &dice->tx_stream;
}
/* Some packet queueing errors. */
if (amdtp_streaming_error(master) || amdtp_streaming_error(slave))
stop_stream(dice, master);
/* Stop stream if rate is different. */
err = snd_dice_transaction_get_rate(dice, &curr_rate);
if (err < 0) {
dev_err(&dice->unit->device,
"fail to get sampling rate\n");
goto end;
}
if (rate == 0)
rate = curr_rate;
if (rate != curr_rate)
stop_stream(dice, master);
if (!amdtp_stream_running(master)) {
stop_stream(dice, slave);
snd_dice_transaction_clear_enable(dice);
amdtp_stream_set_sync(sync_mode, master, slave);
err = snd_dice_transaction_set_rate(dice, rate);
if (err < 0) {
dev_err(&dice->unit->device,
"fail to set sampling rate\n");
goto end;
}
/* Start both streams. */
err = start_stream(dice, master, rate);
if (err < 0) {
dev_err(&dice->unit->device,
"fail to start AMDTP master stream\n");
goto end;
}
err = start_stream(dice, slave, rate);
if (err < 0) {
dev_err
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