[PATCH v4 13/20] ASoC: SOF: Intel: add SKL+ platform DAIs

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

From: Keyon Jie <yang.jie@linux.intel.com>

Add declarations for DAIs and utilities for link DMA management

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/intel/hda-dai.c | 318 ++++++++++++++++++++++++++++++++++
 1 file changed, 318 insertions(+)
 create mode 100644 sound/soc/sof/intel/hda-dai.c

diff --git a/sound/soc/sof/intel/hda-dai.c b/sound/soc/sof/intel/hda-dai.c
new file mode 100644
index 000000000000..e7ecbb23eb05
--- /dev/null
+++ b/sound/soc/sof/intel/hda-dai.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+//
+// This file is provided under a dual BSD/GPLv2 license.  When using or
+// redistributing this file, you may do so under either license.
+//
+// Copyright(c) 2018 Intel Corporation. All rights reserved.
+//
+// Authors: Keyon Jie <yang.jie@linux.intel.com>
+//
+
+#include <sound/pcm_params.h>
+#include <sound/hdaudio_ext.h>
+#include "../sof-priv.h"
+#include "hda.h"
+
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
+
+struct hda_pipe_params {
+	u8 host_dma_id;
+	u8 link_dma_id;
+	u32 ch;
+	u32 s_freq;
+	u32 s_fmt;
+	u8 linktype;
+	snd_pcm_format_t format;
+	int link_index;
+	int stream;
+	unsigned int host_bps;
+	unsigned int link_bps;
+};
+
+/*
+ * Unlike GP dma, there is a set of stream registers in hda controller
+ * to control the link dma channels. Each register controls one link
+ * dma channel and the relation is fixed. To make sure FW uses correct
+ * link dma channels, host allocates stream registers and sends the
+ * corresponding link dma channels to FW to allocate link dma channel
+ *
+ * FIXME: this API is abused in the sense that tx_num and rx_num are
+ * passed as arguments, not returned. We need to find a better way to
+ * retrieve the stream tag allocated for the link DMA
+ */
+static int hda_link_dma_get_channels(struct snd_soc_dai *dai,
+				     unsigned int *tx_num,
+				     unsigned int *tx_slot,
+				     unsigned int *rx_num,
+				     unsigned int *rx_slot)
+{
+	struct hdac_bus *bus;
+	struct hdac_ext_stream *stream;
+	struct snd_pcm_substream substream;
+	struct snd_sof_dev *sdev =
+		snd_soc_component_get_drvdata(dai->component);
+
+	bus = sof_to_bus(sdev);
+
+	memset(&substream, 0, sizeof(substream));
+	if (*tx_num == 1) {
+		substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
+		stream = snd_hdac_ext_stream_assign(bus, &substream,
+						    HDAC_EXT_STREAM_TYPE_LINK);
+		if (!stream) {
+			dev_err(bus->dev, "error: failed to find a free hda ext stream for playback");
+			return -EBUSY;
+		}
+
+		snd_soc_dai_set_dma_data(dai, &substream, (void *)stream);
+		*tx_slot = hdac_stream(stream)->stream_tag - 1;
+
+		dev_dbg(bus->dev, "link dma channel %d for playback", *tx_slot);
+	}
+
+	if (*rx_num == 1) {
+		substream.stream = SNDRV_PCM_STREAM_CAPTURE;
+		stream = snd_hdac_ext_stream_assign(bus, &substream,
+						    HDAC_EXT_STREAM_TYPE_LINK);
+		if (!stream) {
+			dev_err(bus->dev, "error: failed to find a free hda ext stream for capture");
+			return -EBUSY;
+		}
+
+		snd_soc_dai_set_dma_data(dai, &substream, (void *)stream);
+		*rx_slot = hdac_stream(stream)->stream_tag - 1;
+
+		dev_dbg(bus->dev, "link dma channel %d for capture", *rx_slot);
+	}
+
+	return 0;
+}
+
+static int hda_link_dma_params(struct hdac_ext_stream *stream,
+			       struct hda_pipe_params *params)
+{
+	struct hdac_stream *hstream = &stream->hstream;
+	unsigned char stream_tag = hstream->stream_tag;
+	struct hdac_bus *bus = hstream->bus;
+	struct hdac_ext_link *link;
+	unsigned int format_val;
+
+	snd_hdac_ext_stream_decouple(bus, stream, true);
+	snd_hdac_ext_link_stream_reset(stream);
+
+	format_val = snd_hdac_calc_stream_format(params->s_freq, params->ch,
+						 params->format,
+						 params->link_bps, 0);
+
+	dev_dbg(bus->dev, "format_val=%d, rate=%d, ch=%d, format=%d\n",
+		format_val, params->s_freq, params->ch, params->format);
+
+	snd_hdac_ext_link_stream_setup(stream, format_val);
+
+	if (stream->hstream.direction == SNDRV_PCM_STREAM_PLAYBACK) {
+		list_for_each_entry(link, &bus->hlink_list, list) {
+			if (link->index == params->link_index)
+				snd_hdac_ext_link_set_stream_id(link,
+								stream_tag);
+		}
+	}
+
+	stream->link_prepared = 1;
+
+	return 0;
+}
+
+static int hda_link_hw_params(struct snd_pcm_substream *substream,
+			      struct snd_pcm_hw_params *params,
+			      struct snd_soc_dai *dai)
+{
+	struct hdac_stream *hstream = substream->runtime->private_data;
+	struct hdac_bus *bus = hstream->bus;
+	struct hdac_ext_stream *link_dev;
+	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct hda_pipe_params p_params = {0};
+	struct hdac_ext_link *link;
+	int stream_tag;
+
+	link_dev = snd_soc_dai_get_dma_data(dai, substream);
+
+	link = snd_hdac_ext_bus_get_link(bus, codec_dai->component->name);
+	if (!link)
+		return -EINVAL;
+
+	stream_tag = hdac_stream(link_dev)->stream_tag;
+
+	/* set the stream tag in the codec dai dma params  */
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		snd_soc_dai_set_tdm_slot(codec_dai, stream_tag, 0, 0, 0);
+	else
+		snd_soc_dai_set_tdm_slot(codec_dai, 0, stream_tag, 0, 0);
+
+	p_params.s_fmt = snd_pcm_format_width(params_format(params));
+	p_params.ch = params_channels(params);
+	p_params.s_freq = params_rate(params);
+	p_params.stream = substream->stream;
+	p_params.link_dma_id = stream_tag - 1;
+	p_params.link_index = link->index;
+	p_params.format = params_format(params);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		p_params.link_bps = codec_dai->driver->playback.sig_bits;
+	else
+		p_params.link_bps = codec_dai->driver->capture.sig_bits;
+
+	return hda_link_dma_params(link_dev, &p_params);
+}
+
+static int hda_link_pcm_trigger(struct snd_pcm_substream *substream,
+				int cmd, struct snd_soc_dai *dai)
+{
+	struct hdac_ext_stream *link_dev =
+				snd_soc_dai_get_dma_data(dai, substream);
+
+	dev_dbg(dai->dev, "In %s cmd=%d\n", __func__, cmd);
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		snd_hdac_ext_link_stream_start(link_dev);
+		break;
+
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_STOP:
+		snd_hdac_ext_link_stream_clear(link_dev);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * FIXME: This API is also abused since it's used for two purposes.
+ * when the substream argument is NULL this function is used for cleanups
+ * that aren't necessarily required, and called explicitly by handling
+ * ASoC core structures, which is not recommended.
+ * This part will be reworked in follow-up patches.
+ */
+static int hda_link_hw_free(struct snd_pcm_substream *substream,
+			    struct snd_soc_dai *dai)
+{
+	const char *name;
+	unsigned int stream_tag;
+	struct hdac_bus *bus;
+	struct hdac_ext_link *link;
+	struct hdac_stream *hstream;
+	struct hdac_ext_stream *stream;
+	struct snd_soc_pcm_runtime *rtd;
+	struct hdac_ext_stream *link_dev;
+	struct snd_pcm_substream pcm_substream;
+
+	memset(&pcm_substream, 0, sizeof(pcm_substream));
+	if (substream) {
+		hstream = substream->runtime->private_data;
+		bus = hstream->bus;
+		rtd = snd_pcm_substream_chip(substream);
+		link_dev = snd_soc_dai_get_dma_data(dai, substream);
+		snd_hdac_ext_stream_decouple(bus, link_dev, false);
+		name = rtd->codec_dai->component->name;
+		link = snd_hdac_ext_bus_get_link(bus, name);
+		if (!link)
+			return -EINVAL;
+
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			stream_tag = hdac_stream(link_dev)->stream_tag;
+			snd_hdac_ext_link_clear_stream_id(link, stream_tag);
+		}
+
+		link_dev->link_prepared = 0;
+	} else {
+		/* release all hda streams when dai link is unloaded */
+		pcm_substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
+		stream = snd_soc_dai_get_dma_data(dai, &pcm_substream);
+		if (stream) {
+			snd_soc_dai_set_dma_data(dai, &pcm_substream, NULL);
+			snd_hdac_ext_stream_release(stream,
+						    HDAC_EXT_STREAM_TYPE_LINK);
+		}
+
+		pcm_substream.stream = SNDRV_PCM_STREAM_CAPTURE;
+		stream = snd_soc_dai_get_dma_data(dai, &pcm_substream);
+		if (stream) {
+			snd_soc_dai_set_dma_data(dai, &pcm_substream, NULL);
+			snd_hdac_ext_stream_release(stream,
+						    HDAC_EXT_STREAM_TYPE_LINK);
+		}
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops hda_link_dai_ops = {
+	.hw_params = hda_link_hw_params,
+	.hw_free = hda_link_hw_free,
+	.trigger = hda_link_pcm_trigger,
+	.get_channel_map = hda_link_dma_get_channels,
+};
+#endif
+
+/*
+ * common dai driver for skl+ platforms.
+ * some products who use this DAI array only physically have a subset of
+ * the DAIs, but no harm is done here by adding the whole set.
+ */
+struct snd_soc_dai_driver skl_dai[] = {
+{
+	.name = "SSP0 Pin",
+},
+{
+	.name = "SSP1 Pin",
+},
+{
+	.name = "SSP2 Pin",
+},
+{
+	.name = "SSP3 Pin",
+},
+{
+	.name = "SSP4 Pin",
+},
+{
+	.name = "SSP5 Pin",
+},
+{
+	.name = "DMIC01 Pin",
+},
+{
+	.name = "DMIC16k Pin",
+},
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
+{
+	.name = "iDisp1 Pin",
+	.ops = &hda_link_dai_ops,
+},
+{
+	.name = "iDisp2 Pin",
+	.ops = &hda_link_dai_ops,
+},
+{
+	.name = "iDisp3 Pin",
+	.ops = &hda_link_dai_ops,
+},
+{
+	.name = "Analog CPU DAI",
+	.ops = &hda_link_dai_ops,
+},
+{
+	.name = "Digital CPU DAI",
+	.ops = &hda_link_dai_ops,
+},
+{
+	.name = "Alt Analog CPU DAI",
+	.ops = &hda_link_dai_ops,
+},
+#endif
+};
-- 
2.17.1