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/*
* digi00x-stream.c - a part of driver for Digidesign Digi 002/003 family
*
* Copyright (c) 2014-2015 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "digi00x.h"
#define CALLBACK_TIMEOUT 500
const unsigned int snd_dg00x_stream_rates[SND_DG00X_RATE_COUNT] = {
[SND_DG00X_RATE_44100] = 44100,
[SND_DG00X_RATE_48000] = 48000,
[SND_DG00X_RATE_88200] = 88200,
[SND_DG00X_RATE_96000] = 96000,
};
/* Multi Bit Linear Audio data channels for each sampling transfer frequency. */
const unsigned int
snd_dg00x_stream_pcm_channels[SND_DG00X_RATE_COUNT] = {
/* Analog/ADAT/SPDIF */
[SND_DG00X_RATE_44100] = (8 + 8 + 2),
[SND_DG00X_RATE_48000] = (8 + 8 + 2),
/* Analog/SPDIF */
[SND_DG00X_RATE_88200] = (8 + 2),
[SND_DG00X_RATE_96000] = (8 + 2),
};
int snd_dg00x_stream_get_local_rate(struct snd_dg00x *dg00x, unsigned int *rate)
{
u32 data;
__be32 reg;
int err;
err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_LOCAL_RATE,
®, sizeof(reg), 0);
if (err < 0)
return err;
data = be32_to_cpu(reg) & 0x0f;
if (data < ARRAY_SIZE(snd_dg00x_stream_rates))
*rate = snd_dg00x_stream_rates[data];
else
err = -EIO;
return err;
}
int snd_dg00x_stream_set_local_rate(struct snd_dg00x *dg00x, unsigned int rate)
{
__be32 reg;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(snd_dg00x_stream_rates); i++) {
if (rate == snd_dg00x_stream_rates[i])
break;
}
if (i == ARRAY_SIZE(snd_dg00x_stream_rates))
return -EINVAL;
reg = cpu_to_be32(i);
return snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_LOCAL_RATE,
®, sizeof(reg), 0);
}
int snd_dg00x_stream_get_clock(struct snd_dg00x *dg00x,
enum snd_dg00x_clock *clock)
{
__be32 reg;
int err;
err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_CLOCK_SOURCE,
®, sizeof(reg), 0);
if (err < 0)
return err;
*clock = be32_to_cpu(reg) & 0x0f;
if (*clock >= SND_DG00X_CLOCK_COUNT)
err = -EIO;
return err;
}
int snd_dg00x_stream_check_external_clock(struct snd_dg00x *dg00x, bool *detect)
{
__be32 reg;
int err;
err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_DETECT_EXTERNAL,
®, sizeof(reg), 0);
if (err >= 0)
*detect = be32_to_cpu(reg) > 0;
return err;
}
int snd_dg00x_stream_get_external_rate(struct snd_dg00x *dg00x,
unsigned int *rate)
{
u32 data;
__be32 reg;
int err;
err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_EXTERNAL_RATE,
®, sizeof(reg), 0);
if (err < 0)
return err;
data = be32_to_cpu(reg) & 0x0f;
if (data < ARRAY_SIZE(snd_dg00x_stream_rates))
*rate = snd_dg00x_stream_rates[data];
/* This means desync. */
else
err = -EBUSY;
return err;
}
static void finish_session(struct snd_dg00x *dg00x)
{
__be32 data = cpu_to_be32(0x00000003);
snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_STREAMING_SET,
&data, sizeof(data), 0);
}
static int begin_session(struct snd_dg00x *dg00x)
{
__be32 data;
u32 curr;
int err;
err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_STREAMING_STATE,
&data, sizeof(data), 0);
if (err < 0)
goto error;
curr = be32_to_cpu(data);
if (curr == 0)
curr = 2;
curr--;
while (curr > 0) {
data = cpu_to_be32(curr);
err = snd_fw_transaction(dg00x->unit,
TCODE_WRITE_QUADLET_REQUEST,
DG00X_ADDR_BASE +
DG00X_OFFSET_STREAMING_SET,
&data, sizeof(data), 0);
if (err < 0)
goto error;
msleep(20);
curr--;
}
return 0;
error:
finish_session(dg00x);
return err;
}
static void release_resources(struct snd_dg00x *dg00x)
{
__be32 data = 0;
/* Unregister isochronous channels for both direction. */
snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_ISOC_CHANNELS,
&data, sizeof(data), 0);
/* Release isochronous resources. */
fw_iso_resources_free(&dg00x->tx_resources);
fw_iso_resources_free(&dg00x->rx_resources);
}
static int keep_resources(struct snd_dg00x *dg00x, unsigned int rate)
{
unsigned int i;
__be32 data;
int err;
/* Check sampling rate. */
for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
if (snd_dg00x_stream_rates[i] == rate)
break;
}
if (i == SND_DG00X_RATE_COUNT)
return -EINVAL;
/* Keep resources for out-stream. */
err = amdtp_dot_set_parameters(&dg00x->rx_stream, rate,
snd_dg00x_stream_pcm_channels[i], 0);
if (err < 0)
return err;
err = fw_iso_resources_allocate(&dg00x->rx_resources,
amdtp_stream_get_max_payload(&dg00x->rx_stream),
fw_parent_device(dg00x->unit)->max_speed);
if (err < 0)
return err;
/* Keep resources for in-stream. */
err = amdtp_dot_set_parameters(&dg00x->tx_stream, rate,
snd_dg00x_stream_pcm_channels[i], 0);
if (err < 0)
return err;
err = fw_iso_resources_allocate(&dg00x->tx_resources,
amdtp_stream_get_max_payload(&dg00x->tx_stream),
fw_parent_device(dg00x->unit)->max_speed);
if (err < 0)
goto error;
/* Register isochronous channels for both direction. */
data = cpu_to_be32((dg00x->tx_resources.channel << 16) |
dg00x->rx_resources.channel);
err = snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST,
DG00X_ADDR_BASE + DG00X_OFFSET_ISOC_CHANNELS,
&data, sizeof(data), 0);
if (err < 0)
goto error;
return 0;
error:
release_resources(dg00x);
return err;
}
int snd_dg00x_stream_init_duplex(struct snd_dg00x *dg00x)
{
int err;
/* For out-stream. */
err = fw_iso_resources_init(&dg00x->rx_resources, dg00x->unit);
if (err < 0)
goto error;
err = amdtp_dot_init(&dg00x->rx_stream, dg00x->unit, AMDTP_OUT_STREAM);
if (err < 0)
goto error;
/* For in-stream. */
err = fw_iso_resources_init(&dg00x->tx_resources, dg00x->unit);
if (err < 0)
goto error;
err = amdtp_dot_init(&dg00x->tx_stream, dg00x->unit, AMDTP_IN_STREAM);
if (err < 0)
goto error;
return 0;
error:
snd_dg00x_stream_destroy_duplex(dg00x);
return err;
}
/*
* This function should be called before starting streams or after stopping
* streams.
*/
void snd_dg00x_stream_destroy_duplex(struct snd_dg00x *dg00x)
{
amdtp_stream_destroy(&dg00x->rx_stream);
fw_iso_resources_destroy(&dg00x->rx_resources);
amdtp_stream_destroy(&dg00x->tx_stream);
fw_iso_resources_destroy(&dg00x->tx_resources);
}
int snd_dg00x_stream_start_duplex(struct snd_dg00x *dg00x, unsigned int rate)
{
unsigned int curr_rate;
int err = 0;
if (dg00x->substreams_counter == 0)
goto end;
/* Check current sampling rate. */
err = snd_dg00x_stream_get_local_rate(dg00x, &curr_rate);
if (err < 0)
goto error;
if (curr_rate != rate ||
amdtp_streaming_error(&dg00x->tx_stream) ||
amdtp_streaming_error(&dg00x->rx_stream)) {
finish_session(dg00x);
amdtp_stream_stop(&dg00x->tx_stream);
amdtp_stream_stop(&dg00x->rx_stream);
release_resources(dg00x);
}
/*
* No packets are transmitted without receiving packets, reagardless of
* which source of clock is used.
*/
if (!amdtp_stream_running(&dg00x->rx_stream)) {
err = snd_dg00x_stream_set_local_rate(dg00x, rate);
if (err < 0)
goto error;
err = keep_resources(dg00x, rate);
if (err < 0)
goto error;
err = begin_session(dg00x);
if (err < 0)
goto error;
err = amdtp_stream_start(&dg00x->rx_stream,
dg00x->rx_resources.channel,
fw_parent_device(dg00x->unit)->max_speed);
if (err < 0)
goto error;
if (!amdtp_stream_wait_callback(&dg00x->rx_stream,
CALLBACK_TIMEOUT)) {
err = -ETIMEDOUT;
goto error;
}
}
/*
* The value of SYT field in transmitted packets is always 0x0000. Thus,
* duplex streams with timestamp synchronization cannot be built.
*/
if (!amdtp_stream_running(&dg00x->tx_stream)) {
err = amdtp_stream_start(&dg00x->tx_stream,
dg00x->tx_resources.channel,
fw_parent_device(dg00x->unit)->max_speed);
if (err < 0)
goto error;
if (!amdtp_stream_wait_callback(&dg00x->tx_stream,
CALLBACK_TIMEOUT)) {
err = -ETIMEDOUT;
goto error;
}
}
end:
return err;
error:
finish_session(dg00x);
amdtp_stream_stop(&dg00x->tx_stream);
amdtp_stream_stop(&dg00x->rx_stream);
release_resources(dg00x);
return err;
}
void snd_dg00x_stream_stop_duplex(struct snd_dg00x *dg00x)
{
if (dg00x->substreams_counter > 0)
return;
amdtp_stream_stop(&dg00x->tx_stream);
amdtp_stream_stop(&dg00x->rx_stream);
finish_session(dg00x);
release_resources(dg00x);
/*
* Just after finishing the session, the device may lost transmitting
* functionality for a short time.
*/
msleep(50);
}
void snd_dg00x_stream_update_duplex(struct snd_dg00x *dg00x)
{
fw_iso_resources_update(&dg00x->tx_resources);
fw_iso_resources_update(&dg00x->rx_resources);
amdtp_stream_update(&dg00x->tx_stream);
amdtp_stream_update(&dg00x->rx_stream);
}
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