--- /dev/null
+/*
+ * 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;
+ 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.
+ */
+ if (mode > 1) {
+ rate /= 2;
+ pcm_chs *= 2;
+ stream->double_pcm_frames = true;
+ } else {
+ stream->double_pcm_frames = false;
+ }
+
+ amdtp_stream_set_parameters(stream, rate, pcm_chs, midi_ports);
+ if (mode > 1) {
+ 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(&dice->unit->device,
+ "fail to start AMDTP slave stream\n");
+ stop_stream(dice, master);
+ goto end;
+ }
+ err = snd_dice_transaction_set_enable(dice);
+ if (err < 0) {
+ dev_err(&dice->unit->device,
+ "fail to enable interface\n");
+ stop_stream(dice, master);
+ stop_stream(dice, slave);
+ goto end;
+ }
+
+ /* Wait first callbacks */
+ if (!amdtp_stream_wait_callback(master, CALLBACK_TIMEOUT) ||
+ !amdtp_stream_wait_callback(slave, CALLBACK_TIMEOUT)) {
+ snd_dice_transaction_clear_enable(dice);
+ stop_stream(dice, master);
+ stop_stream(dice, slave);
+ err = -ETIMEDOUT;
+ }
+ }
+end:
+ return err;
+}
+
+void snd_dice_stream_stop_duplex(struct snd_dice *dice)
+{
+ if (dice->substreams_counter > 0)
+ return;
+
+ snd_dice_transaction_clear_enable(dice);
+
+ stop_stream(dice, &dice->tx_stream);
+ stop_stream(dice, &dice->rx_stream);
+}
+
+static int init_stream(struct snd_dice *dice, struct amdtp_stream *stream)
+{
+ int err;
+ struct fw_iso_resources *resources;
+ enum amdtp_stream_direction dir;
+
+ if (stream == &dice->tx_stream) {
+ resources = &dice->tx_resources;
+ dir = AMDTP_IN_STREAM;
+ } else {
+ resources = &dice->rx_resources;
+ dir = AMDTP_OUT_STREAM;
+ }
+
+ err = fw_iso_resources_init(resources, dice->unit);
+ if (err < 0)
+ goto end;
+ resources->channels_mask = 0x00000000ffffffffuLL;
+
+ err = amdtp_stream_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, struct amdtp_stream *stream)
+{
+ struct fw_iso_resources *resources;
+
+ if (stream == &dice->tx_stream)
+ resources = &dice->tx_resources;
+ else
+ resources = &dice->rx_resources;
+
+ amdtp_stream_destroy(stream);
+ fw_iso_resources_destroy(resources);
+}
+
+int snd_dice_stream_init_duplex(struct snd_dice *dice)
+{
+ int err;
+
+ dice->substreams_counter = 0;
+
+ err = init_stream(dice, &dice->tx_stream);
+ if (err < 0)
+ goto end;
+
+ err = init_stream(dice, &dice->rx_stream);
+ if (err < 0)
+ destroy_stream(dice, &dice->tx_stream);
+end:
+ return err;
+}
+
+void snd_dice_stream_destroy_duplex(struct snd_dice *dice)
+{
+ snd_dice_transaction_clear_enable(dice);
+
+ destroy_stream(dice, &dice->tx_stream);
+ destroy_stream(dice, &dice->rx_stream);
+
+ dice->substreams_counter = 0;
+}
+
+void snd_dice_stream_update_duplex(struct snd_dice *dice)
+{
+ /*
+ * 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;
+
+ stop_stream(dice, &dice->rx_stream);
+ stop_stream(dice, &dice->tx_stream);
+
+ fw_iso_resources_update(&dice->rx_resources);
+ fw_iso_resources_update(&dice->tx_resources);
+}
+
+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);
+}
Code Review / kvmfornfv.git / blobdiff