Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 422 insertions, 0 deletions

diff --git a/kernel/sound/firewire/dice/dice-pcm.c b/kernel/sound/firewire/dice/dice-pcm.c
new file mode 100644
index 000000000..f77714511
--- /dev/null
+++ b/kernel/sound/firewire/dice/dice-pcm.c
@@ -0,0 +1,422 @@
+/*
+ * dice_pcm.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"
+
+static int dice_rate_constraint(struct snd_pcm_hw_params *params,
+				struct snd_pcm_hw_rule *rule)
+{
+	struct snd_pcm_substream *substream = rule->private;
+	struct snd_dice *dice = substream->private_data;
+
+	const struct snd_interval *c =
+		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+	struct snd_interval *r =
+		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+	struct snd_interval rates = {
+		.min = UINT_MAX, .max = 0, .integer = 1
+	};
+	unsigned int i, rate, mode, *pcm_channels;
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+		pcm_channels = dice->tx_channels;
+	else
+		pcm_channels = dice->rx_channels;
+
+	for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) {
+		rate = snd_dice_rates[i];
+		if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0)
+			continue;
+
+		if (!snd_interval_test(c, pcm_channels[mode]))
+			continue;
+
+		rates.min = min(rates.min, rate);
+		rates.max = max(rates.max, rate);
+	}
+
+	return snd_interval_refine(r, &rates);
+}
+
+static int dice_channels_constraint(struct snd_pcm_hw_params *params,
+				    struct snd_pcm_hw_rule *rule)
+{
+	struct snd_pcm_substream *substream = rule->private;
+	struct snd_dice *dice = substream->private_data;
+
+	const struct snd_interval *r =
+		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
+	struct snd_interval *c =
+		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+	struct snd_interval channels = {
+		.min = UINT_MAX, .max = 0, .integer = 1
+	};
+	unsigned int i, rate, mode, *pcm_channels;
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+		pcm_channels = dice->tx_channels;
+	else
+		pcm_channels = dice->rx_channels;
+
+	for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) {
+		rate = snd_dice_rates[i];
+		if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0)
+			continue;
+
+		if (!snd_interval_test(r, rate))
+			continue;
+
+		channels.min = min(channels.min, pcm_channels[mode]);
+		channels.max = max(channels.max, pcm_channels[mode]);
+	}
+
+	return snd_interval_refine(c, &channels);
+}
+
+static void limit_channels_and_rates(struct snd_dice *dice,
+				     struct snd_pcm_runtime *runtime,
+				     unsigned int *pcm_channels)
+{
+	struct snd_pcm_hardware *hw = &runtime->hw;
+	unsigned int i, rate, mode;
+
+	hw->channels_min = UINT_MAX;
+	hw->channels_max = 0;
+
+	for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) {
+		rate = snd_dice_rates[i];
+		if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0)
+			continue;
+		hw->rates |= snd_pcm_rate_to_rate_bit(rate);
+
+		if (pcm_channels[mode] == 0)
+			continue;
+		hw->channels_min = min(hw->channels_min, pcm_channels[mode]);
+		hw->channels_max = max(hw->channels_max, pcm_channels[mode]);
+	}
+
+	snd_pcm_limit_hw_rates(runtime);
+}
+
+static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
+{
+	hw->periods_min = 2;			/* SNDRV_PCM_INFO_BATCH */
+	hw->periods_max = UINT_MAX;
+
+	hw->period_bytes_min = 4 * hw->channels_max;    /* byte for a frame */
+
+	/* Just to prevent from allocating much pages. */
+	hw->period_bytes_max = hw->period_bytes_min * 2048;
+	hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
+}
+
+static int init_hw_info(struct snd_dice *dice,
+			struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_pcm_hardware *hw = &runtime->hw;
+	struct amdtp_stream *stream;
+	unsigned int *pcm_channels;
+	int err;
+
+	hw->info = SNDRV_PCM_INFO_MMAP |
+		   SNDRV_PCM_INFO_MMAP_VALID |
+		   SNDRV_PCM_INFO_BATCH |
+		   SNDRV_PCM_INFO_INTERLEAVED |
+		   SNDRV_PCM_INFO_JOINT_DUPLEX |
+		   SNDRV_PCM_INFO_BLOCK_TRANSFER;
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+		hw->formats = AMDTP_IN_PCM_FORMAT_BITS;
+		stream = &dice->tx_stream;
+		pcm_channels = dice->tx_channels;
+	} else {
+		hw->formats = AMDTP_OUT_PCM_FORMAT_BITS;
+		stream = &dice->rx_stream;
+		pcm_channels = dice->rx_channels;
+	}
+
+	limit_channels_and_rates(dice, runtime, pcm_channels);
+	limit_period_and_buffer(hw);
+
+	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+				  dice_rate_constraint, substream,
+				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+	if (err < 0)
+		goto end;
+	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+				  dice_channels_constraint, substream,
+				  SNDRV_PCM_HW_PARAM_RATE, -1);
+	if (err < 0)
+		goto end;
+
+	err = amdtp_stream_add_pcm_hw_constraints(stream, runtime);
+end:
+	return err;
+}
+
+static int pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_dice *dice = substream->private_data;
+	unsigned int source, rate;
+	bool internal;
+	int err;
+
+	err = snd_dice_stream_lock_try(dice);
+	if (err < 0)
+		goto end;
+
+	err = init_hw_info(dice, substream);
+	if (err < 0)
+		goto err_locked;
+
+	err = snd_dice_transaction_get_clock_source(dice, &source);
+	if (err < 0)
+		goto err_locked;
+	switch (source) {
+	case CLOCK_SOURCE_AES1:
+	case CLOCK_SOURCE_AES2:
+	case CLOCK_SOURCE_AES3:
+	case CLOCK_SOURCE_AES4:
+	case CLOCK_SOURCE_AES_ANY:
+	case CLOCK_SOURCE_ADAT:
+	case CLOCK_SOURCE_TDIF:
+	case CLOCK_SOURCE_WC:
+		internal = false;
+		break;
+	default:
+		internal = true;
+		break;
+	}
+
+	/*
+	 * When source of clock is not internal or any PCM streams are running,
+	 * available sampling rate is limited at current sampling rate.
+	 */
+	if (!internal ||
+	    amdtp_stream_pcm_running(&dice->tx_stream) ||
+	    amdtp_stream_pcm_running(&dice->rx_stream)) {
+		err = snd_dice_transaction_get_rate(dice, &rate);
+		if (err < 0)
+			goto err_locked;
+		substream->runtime->hw.rate_min = rate;
+		substream->runtime->hw.rate_max = rate;
+	}
+
+	snd_pcm_set_sync(substream);
+end:
+	return err;
+err_locked:
+	snd_dice_stream_lock_release(dice);
+	return err;
+}
+
+static int pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	snd_dice_stream_lock_release(dice);
+
+	return 0;
+}
+
+static int capture_hw_params(struct snd_pcm_substream *substream,
+			     struct snd_pcm_hw_params *hw_params)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+		mutex_lock(&dice->mutex);
+		dice->substreams_counter++;
+		mutex_unlock(&dice->mutex);
+	}
+
+	amdtp_stream_set_pcm_format(&dice->tx_stream,
+				    params_format(hw_params));
+
+	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+						params_buffer_bytes(hw_params));
+}
+static int playback_hw_params(struct snd_pcm_substream *substream,
+			      struct snd_pcm_hw_params *hw_params)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+		mutex_lock(&dice->mutex);
+		dice->substreams_counter++;
+		mutex_unlock(&dice->mutex);
+	}
+
+	amdtp_stream_set_pcm_format(&dice->rx_stream,
+				    params_format(hw_params));
+
+	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+						params_buffer_bytes(hw_params));
+}
+
+static int capture_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	mutex_lock(&dice->mutex);
+
+	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+		dice->substreams_counter--;
+
+	snd_dice_stream_stop_duplex(dice);
+
+	mutex_unlock(&dice->mutex);
+
+	return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int playback_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	mutex_lock(&dice->mutex);
+
+	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+		dice->substreams_counter--;
+
+	snd_dice_stream_stop_duplex(dice);
+
+	mutex_unlock(&dice->mutex);
+
+	return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int capture_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_dice *dice = substream->private_data;
+	int err;
+
+	mutex_lock(&dice->mutex);
+	err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
+	mutex_unlock(&dice->mutex);
+	if (err >= 0)
+		amdtp_stream_pcm_prepare(&dice->tx_stream);
+
+	return 0;
+}
+static int playback_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_dice *dice = substream->private_data;
+	int err;
+
+	mutex_lock(&dice->mutex);
+	err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
+	mutex_unlock(&dice->mutex);
+	if (err >= 0)
+		amdtp_stream_pcm_prepare(&dice->rx_stream);
+
+	return err;
+}
+
+static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		amdtp_stream_pcm_trigger(&dice->tx_stream, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		amdtp_stream_pcm_trigger(&dice->tx_stream, NULL);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		amdtp_stream_pcm_trigger(&dice->rx_stream, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		amdtp_stream_pcm_trigger(&dice->rx_stream, NULL);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	return amdtp_stream_pcm_pointer(&dice->tx_stream);
+}
+static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_dice *dice = substream->private_data;
+
+	return amdtp_stream_pcm_pointer(&dice->rx_stream);
+}
+
+int snd_dice_create_pcm(struct snd_dice *dice)
+{
+	static struct snd_pcm_ops capture_ops = {
+		.open      = pcm_open,
+		.close     = pcm_close,
+		.ioctl     = snd_pcm_lib_ioctl,
+		.hw_params = capture_hw_params,
+		.hw_free   = capture_hw_free,
+		.prepare   = capture_prepare,
+		.trigger   = capture_trigger,
+		.pointer   = capture_pointer,
+		.page      = snd_pcm_lib_get_vmalloc_page,
+		.mmap      = snd_pcm_lib_mmap_vmalloc,
+	};
+	static struct snd_pcm_ops playback_ops = {
+		.open      = pcm_open,
+		.close     = pcm_close,
+		.ioctl     = snd_pcm_lib_ioctl,
+		.hw_params = playback_hw_params,
+		.hw_free   = playback_hw_free,
+		.prepare   = playback_prepare,
+		.trigger   = playback_trigger,
+		.pointer   = playback_pointer,
+		.page      = snd_pcm_lib_get_vmalloc_page,
+		.mmap      = snd_pcm_lib_mmap_vmalloc,
+	};
+	struct snd_pcm *pcm;
+	unsigned int i, capture, playback;
+	int err;
+
+	capture = playback = 0;
+	for (i = 0; i < 3; i++) {
+		if (dice->tx_channels[i] > 0)
+			capture = 1;
+		if (dice->rx_channels[i] > 0)
+			playback = 1;
+	}
+
+	err = snd_pcm_new(dice->card, "DICE", 0, playback, capture, &pcm);
+	if (err < 0)
+		return err;
+	pcm->private_data = dice;
+	strcpy(pcm->name, dice->card->shortname);
+
+	if (capture > 0)
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
+
+	if (playback > 0)
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
+
+	return 0;
+}