swh:1:snp:32555a3fd8878f019c2ebd6c964bc1edcaeff337
Tip revision: 6d08b06e67cd117f6992c46611dfb4ce267cd71e authored by Linus Torvalds on 23 April 2018, 02:20:09 UTC
Linux 4.17-rc2
Linux 4.17-rc2
Tip revision: 6d08b06
dice-stream.c
/*
* 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
#define NOTIFICATION_TIMEOUT_MS (2 * MSEC_PER_SEC)
struct reg_params {
unsigned int count;
unsigned int size;
};
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,
};
/*
* This operation has an effect to synchronize GLOBAL_STATUS/GLOBAL_SAMPLE_RATE
* to GLOBAL_STATUS. Especially, just after powering on, these are different.
*/
static int ensure_phase_lock(struct snd_dice *dice)
{
__be32 reg, nominal;
int err;
err = snd_dice_transaction_read_global(dice, GLOBAL_CLOCK_SELECT,
®, sizeof(reg));
if (err < 0)
return err;
if (completion_done(&dice->clock_accepted))
reinit_completion(&dice->clock_accepted);
err = snd_dice_transaction_write_global(dice, GLOBAL_CLOCK_SELECT,
®, sizeof(reg));
if (err < 0)
return err;
if (wait_for_completion_timeout(&dice->clock_accepted,
msecs_to_jiffies(NOTIFICATION_TIMEOUT_MS)) == 0) {
/*
* Old versions of Dice firmware transfer no notification when
* the same clock status as current one is set. In this case,
* just check current clock status.
*/
err = snd_dice_transaction_read_global(dice, GLOBAL_STATUS,
&nominal, sizeof(nominal));
if (err < 0)
return err;
if (!(be32_to_cpu(nominal) & STATUS_SOURCE_LOCKED))
return -ETIMEDOUT;
}
return 0;
}
static int get_register_params(struct snd_dice *dice,
struct reg_params *tx_params,
struct reg_params *rx_params)
{
__be32 reg[2];
int err;
err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg, sizeof(reg));
if (err < 0)
return err;
tx_params->count =
min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
tx_params->size = be32_to_cpu(reg[1]) * 4;
err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg, sizeof(reg));
if (err < 0)
return err;
rx_params->count =
min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
rx_params->size = be32_to_cpu(reg[1]) * 4;
return 0;
}
static void release_resources(struct snd_dice *dice)
{
unsigned int i;
for (i = 0; i < MAX_STREAMS; i++) {
if (amdtp_stream_running(&dice->tx_stream[i])) {
amdtp_stream_pcm_abort(&dice->tx_stream[i]);
amdtp_stream_stop(&dice->tx_stream[i]);
}
if (amdtp_stream_running(&dice->rx_stream[i])) {
amdtp_stream_pcm_abort(&dice->rx_stream[i]);
amdtp_stream_stop(&dice->rx_stream[i]);
}
fw_iso_resources_free(&dice->tx_resources[i]);
fw_iso_resources_free(&dice->rx_resources[i]);
}
}
static void stop_streams(struct snd_dice *dice, enum amdtp_stream_direction dir,
struct reg_params *params)
{
__be32 reg;
unsigned int i;
for (i = 0; i < params->count; i++) {
reg = cpu_to_be32((u32)-1);
if (dir == AMDTP_IN_STREAM) {
snd_dice_transaction_write_tx(dice,
params->size * i + TX_ISOCHRONOUS,
®, sizeof(reg));
} else {
snd_dice_transaction_write_rx(dice,
params->size * i + RX_ISOCHRONOUS,
®, sizeof(reg));
}
}
}
static int keep_resources(struct snd_dice *dice,
enum amdtp_stream_direction dir, unsigned int index,
unsigned int rate, unsigned int pcm_chs,
unsigned int midi_ports)
{
struct amdtp_stream *stream;
struct fw_iso_resources *resources;
bool double_pcm_frames;
unsigned int i;
int err;
if (dir == AMDTP_IN_STREAM) {
stream = &dice->tx_stream[index];
resources = &dice->tx_resources[index];
} else {
stream = &dice->rx_stream[index];
resources = &dice->rx_resources[index];
}
/*
* 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 = rate > 96000;
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)
return err;
if (double_pcm_frames) {
pcm_chs /= 2;
for (i = 0; i < pcm_chs; i++) {
amdtp_am824_set_pcm_position(stream, i, i * 2);
amdtp_am824_set_pcm_position(stream, i + pcm_chs,
i * 2 + 1);
}
}
return fw_iso_resources_allocate(resources,
amdtp_stream_get_max_payload(stream),
fw_parent_device(dice->unit)->max_speed);
}
static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir,
unsigned int rate, struct reg_params *params)
{
__be32 reg[2];
unsigned int i, pcm_chs, midi_ports;
struct amdtp_stream *streams;
struct fw_iso_resources *resources;
struct fw_device *fw_dev = fw_parent_device(dice->unit);
int err = 0;
if (dir == AMDTP_IN_STREAM) {
streams = dice->tx_stream;
resources = dice->tx_resources;
} else {
streams = dice->rx_stream;
resources = dice->rx_resources;
}
for (i = 0; i < params->count; i++) {
if (dir == AMDTP_IN_STREAM) {
err = snd_dice_transaction_read_tx(dice,
params->size * i + TX_NUMBER_AUDIO,
reg, sizeof(reg));
} else {
err = snd_dice_transaction_read_rx(dice,
params->size * i + RX_NUMBER_AUDIO,
reg, sizeof(reg));
}
if (err < 0)
return err;
pcm_chs = be32_to_cpu(reg[0]);
midi_ports = be32_to_cpu(reg[1]);
err = keep_resources(dice, dir, i, rate, pcm_chs, midi_ports);
if (err < 0)
return err;
reg[0] = cpu_to_be32(resources[i].channel);
if (dir == AMDTP_IN_STREAM) {
err = snd_dice_transaction_write_tx(dice,
params->size * i + TX_ISOCHRONOUS,
reg, sizeof(reg[0]));
} else {
err = snd_dice_transaction_write_rx(dice,
params->size * i + RX_ISOCHRONOUS,
reg, sizeof(reg[0]));
}
if (err < 0)
return err;
if (dir == AMDTP_IN_STREAM) {
reg[0] = cpu_to_be32(fw_dev->max_speed);
err = snd_dice_transaction_write_tx(dice,
params->size * i + TX_SPEED,
reg, sizeof(reg[0]));
if (err < 0)
return err;
}
err = amdtp_stream_start(&streams[i], resources[i].channel,
fw_dev->max_speed);
if (err < 0)
return err;
}
return err;
}
/*
* MEMO: After this function, there're two states of streams:
* - None streams are running.
* - All streams are running.
*/
int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
{
unsigned int curr_rate;
unsigned int i;
struct reg_params tx_params, rx_params;
bool need_to_start;
int err;
if (dice->substreams_counter == 0)
return -EIO;
err = get_register_params(dice, &tx_params, &rx_params);
if (err < 0)
return err;
err = snd_dice_transaction_get_rate(dice, &curr_rate);
if (err < 0) {
dev_err(&dice->unit->device,
"fail to get sampling rate\n");
return err;
}
if (rate == 0)
rate = curr_rate;
if (rate != curr_rate)
return -EINVAL;
/* Judge to need to restart streams. */
for (i = 0; i < MAX_STREAMS; i++) {
if (i < tx_params.count) {
if (amdtp_streaming_error(&dice->tx_stream[i]) ||
!amdtp_stream_running(&dice->tx_stream[i]))
break;
}
if (i < rx_params.count) {
if (amdtp_streaming_error(&dice->rx_stream[i]) ||
!amdtp_stream_running(&dice->rx_stream[i]))
break;
}
}
need_to_start = (i < MAX_STREAMS);
if (need_to_start) {
/* Stop transmission. */
snd_dice_transaction_clear_enable(dice);
stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
release_resources(dice);
err = ensure_phase_lock(dice);
if (err < 0) {
dev_err(&dice->unit->device,
"fail to ensure phase lock\n");
return err;
}
/* Start both streams. */
err = start_streams(dice, AMDTP_IN_STREAM, rate, &tx_params);
if (err < 0)
goto error;
err = start_streams(dice, AMDTP_OUT_STREAM, rate, &rx_params);
if (err < 0)
goto error;
err = snd_dice_transaction_set_enable(dice);
if (err < 0) {
dev_err(&dice->unit->device,
"fail to enable interface\n");
goto error;
}
for (i = 0; i < MAX_STREAMS; i++) {
if ((i < tx_params.count &&
!amdtp_stream_wait_callback(&dice->tx_stream[i],
CALLBACK_TIMEOUT)) ||
(i < rx_params.count &&
!amdtp_stream_wait_callback(&dice->rx_stream[i],
CALLBACK_TIMEOUT))) {
err = -ETIMEDOUT;
goto error;
}
}
}
return err;
error:
snd_dice_transaction_clear_enable(dice);
stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
release_resources(dice);
return err;
}
/*
* MEMO: After this function, there're two states of streams:
* - None streams are running.
* - All streams are running.
*/
void snd_dice_stream_stop_duplex(struct snd_dice *dice)
{
struct reg_params tx_params, rx_params;
if (dice->substreams_counter > 0)
return;
snd_dice_transaction_clear_enable(dice);
if (get_register_params(dice, &tx_params, &rx_params) == 0) {
stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
}
release_resources(dice);
}
static int init_stream(struct snd_dice *dice, enum amdtp_stream_direction dir,
unsigned int index)
{
struct amdtp_stream *stream;
struct fw_iso_resources *resources;
int err;
if (dir == AMDTP_IN_STREAM) {
stream = &dice->tx_stream[index];
resources = &dice->tx_resources[index];
} else {
stream = &dice->rx_stream[index];
resources = &dice->rx_resources[index];
}
err = fw_iso_resources_init(resources, dice->unit);
if (err < 0)
goto end;
resources->channels_mask = 0x00000000ffffffffuLL;
err = amdtp_am824_init(stream, dice->unit, dir, CIP_BLOCKING);
if (err < 0) {
amdtp_stream_destroy(stream);
fw_iso_resources_destroy(resources);
}
end:
return err;
}
/*
* This function should be called before starting streams or after stopping
* streams.
*/
static void destroy_stream(struct snd_dice *dice,
enum amdtp_stream_direction dir,
unsigned int index)
{
struct amdtp_stream *stream;
struct fw_iso_resources *resources;
if (dir == AMDTP_IN_STREAM) {
stream = &dice->tx_stream[index];
resources = &dice->tx_resources[index];
} else {
stream = &dice->rx_stream[index];
resources = &dice->rx_resources[index];
}
amdtp_stream_destroy(stream);
fw_iso_resources_destroy(resources);
}
int snd_dice_stream_init_duplex(struct snd_dice *dice)
{
int i, err;
for (i = 0; i < MAX_STREAMS; i++) {
err = init_stream(dice, AMDTP_IN_STREAM, i);
if (err < 0) {
for (; i >= 0; i--)
destroy_stream(dice, AMDTP_OUT_STREAM, i);
goto end;
}
}
for (i = 0; i < MAX_STREAMS; i++) {
err = init_stream(dice, AMDTP_OUT_STREAM, i);
if (err < 0) {
for (; i >= 0; i--)
destroy_stream(dice, AMDTP_OUT_STREAM, i);
for (i = 0; i < MAX_STREAMS; i++)
destroy_stream(dice, AMDTP_IN_STREAM, i);
break;
}
}
end:
return err;
}
void snd_dice_stream_destroy_duplex(struct snd_dice *dice)
{
unsigned int i;
for (i = 0; i < MAX_STREAMS; i++) {
destroy_stream(dice, AMDTP_IN_STREAM, i);
destroy_stream(dice, AMDTP_OUT_STREAM, i);
}
}
void snd_dice_stream_update_duplex(struct snd_dice *dice)
{
struct reg_params tx_params, rx_params;
/*
* On a bus reset, the DICE firmware disables streaming and then goes
* off contemplating its own navel for hundreds of milliseconds before
* it can react to any of our attempts to reenable streaming. This
* means that we lose synchronization anyway, so we force our streams
* to stop so that the application can restart them in an orderly
* manner.
*/
dice->global_enabled = false;
if (get_register_params(dice, &tx_params, &rx_params) == 0) {
stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
}
}
static void dice_lock_changed(struct snd_dice *dice)
{
dice->dev_lock_changed = true;
wake_up(&dice->hwdep_wait);
}
int snd_dice_stream_lock_try(struct snd_dice *dice)
{
int err;
spin_lock_irq(&dice->lock);
if (dice->dev_lock_count < 0) {
err = -EBUSY;
goto out;
}
if (dice->dev_lock_count++ == 0)
dice_lock_changed(dice);
err = 0;
out:
spin_unlock_irq(&dice->lock);
return err;
}
void snd_dice_stream_lock_release(struct snd_dice *dice)
{
spin_lock_irq(&dice->lock);
if (WARN_ON(dice->dev_lock_count <= 0))
goto out;
if (--dice->dev_lock_count == 0)
dice_lock_changed(dice);
out:
spin_unlock_irq(&dice->lock);
}