ASoC: Intel: avs: Generic soc component driver

Prepare for concrete PCM operations over HDA, DMIC and I2S interfaces by
providing generic soc component implementation. Interface-specific
components re-use this code as majority of flow is shared.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220516101116.190192-3-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-acpi.h

@@ -156,6 +156,7 @@ struct snd_soc_acpi_link_adr {
  * @links: array of link _ADR descriptors, null terminated.
  * @drv_name: machine driver name
  * @fw_filename: firmware file name. Used when SOF is not enabled.
+ * @tplg_filename: topology file name. Used when SOF is not enabled.
  * @board: board name
  * @machine_quirk: pointer to quirk, usually based on DMI information when
  * ACPI ID alone is not sufficient, wrong or misleading
@@ -174,6 +175,7 @@ struct snd_soc_acpi_mach {
 	const struct snd_soc_acpi_link_adr *links;
 	const char *drv_name;
 	const char *fw_filename;
+	const char *tplg_filename;
 	const char *board;
 	struct snd_soc_acpi_mach * (*machine_quirk)(void *arg);
 	const void *quirk_data;

sound/soc/intel/avs/Makefile

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
 snd-soc-avs-objs := dsp.o ipc.o messages.o utils.o core.o loader.o \
-		    topology.o path.o
+		    topology.o path.o pcm.o
 snd-soc-avs-objs += cldma.o
 
 obj-$(CONFIG_SND_SOC_INTEL_AVS) += snd-soc-avs.o

sound/soc/intel/avs/pcm.c

@@ -0,0 +1,275 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright(c) 2021-2022 Intel Corporation. All rights reserved.
+//
+// Authors: Cezary Rojewski <cezary.rojewski@intel.com>
+//          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
+//
+
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <sound/hda_register.h>
+#include <sound/hdaudio_ext.h>
+#include <sound/soc-acpi.h>
+#include <sound/soc-acpi-intel-match.h>
+#include <sound/soc-component.h>
+#include "avs.h"
+#include "path.h"
+#include "topology.h"
+
+struct avs_dma_data {
+	struct avs_tplg_path_template *template;
+	struct avs_path *path;
+	/*
+	 * link stream is stored within substream's runtime
+	 * private_data to fulfill the needs of codec BE path
+	 *
+	 * host stream assigned
+	 */
+	struct hdac_ext_stream *host_stream;
+};
+
+static ssize_t topology_name_read(struct file *file, char __user *user_buf, size_t count,
+				  loff_t *ppos)
+{
+	struct snd_soc_component *component = file->private_data;
+	struct snd_soc_card *card = component->card;
+	struct snd_soc_acpi_mach *mach = dev_get_platdata(card->dev);
+	char buf[64];
+	size_t len;
+
+	len = snprintf(buf, sizeof(buf), "%s/%s\n", component->driver->topology_name_prefix,
+		       mach->tplg_filename);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations topology_name_fops = {
+	.open = simple_open,
+	.read = topology_name_read,
+	.llseek = default_llseek,
+};
+
+static int avs_component_load_libraries(struct avs_soc_component *acomp)
+{
+	struct avs_tplg *tplg = acomp->tplg;
+	struct avs_dev *adev = to_avs_dev(acomp->base.dev);
+	int ret;
+
+	if (!tplg->num_libs)
+		return 0;
+
+	/* Parent device may be asleep and library loading involves IPCs. */
+	ret = pm_runtime_resume_and_get(adev->dev);
+	if (ret < 0)
+		return ret;
+
+	avs_hda_clock_gating_enable(adev, false);
+	avs_hda_l1sen_enable(adev, false);
+
+	ret = avs_dsp_load_libraries(adev, tplg->libs, tplg->num_libs);
+
+	avs_hda_l1sen_enable(adev, true);
+	avs_hda_clock_gating_enable(adev, true);
+
+	if (!ret)
+		ret = avs_module_info_init(adev, false);
+
+	pm_runtime_mark_last_busy(adev->dev);
+	pm_runtime_put_autosuspend(adev->dev);
+
+	return ret;
+}
+
+static int avs_component_probe(struct snd_soc_component *component)
+{
+	struct snd_soc_card *card = component->card;
+	struct snd_soc_acpi_mach *mach;
+	struct avs_soc_component *acomp;
+	struct avs_dev *adev;
+	char *filename;
+	int ret;
+
+	dev_dbg(card->dev, "probing %s card %s\n", component->name, card->name);
+	mach = dev_get_platdata(card->dev);
+	acomp = to_avs_soc_component(component);
+	adev = to_avs_dev(component->dev);
+
+	acomp->tplg = avs_tplg_new(component);
+	if (!acomp->tplg)
+		return -ENOMEM;
+
+	if (!mach->tplg_filename)
+		goto finalize;
+
+	/* Load specified topology and create debugfs for it. */
+	filename = kasprintf(GFP_KERNEL, "%s/%s", component->driver->topology_name_prefix,
+			     mach->tplg_filename);
+	if (!filename)
+		return -ENOMEM;
+
+	ret = avs_load_topology(component, filename);
+	kfree(filename);
+	if (ret < 0)
+		return ret;
+
+	ret = avs_component_load_libraries(acomp);
+	if (ret < 0) {
+		dev_err(card->dev, "libraries loading failed: %d\n", ret);
+		goto err_load_libs;
+	}
+
+finalize:
+	debugfs_create_file("topology_name", 0444, component->debugfs_root, component,
+			    &topology_name_fops);
+
+	mutex_lock(&adev->comp_list_mutex);
+	list_add_tail(&acomp->node, &adev->comp_list);
+	mutex_unlock(&adev->comp_list_mutex);
+
+	return 0;
+
+err_load_libs:
+	avs_remove_topology(component);
+	return ret;
+}
+
+static void avs_component_remove(struct snd_soc_component *component)
+{
+	struct avs_soc_component *acomp = to_avs_soc_component(component);
+	struct snd_soc_acpi_mach *mach;
+	struct avs_dev *adev = to_avs_dev(component->dev);
+	int ret;
+
+	mach = dev_get_platdata(component->card->dev);
+
+	mutex_lock(&adev->comp_list_mutex);
+	list_del(&acomp->node);
+	mutex_unlock(&adev->comp_list_mutex);
+
+	if (mach->tplg_filename) {
+		ret = avs_remove_topology(component);
+		if (ret < 0)
+			dev_err(component->dev, "unload topology failed: %d\n", ret);
+	}
+}
+
+static int avs_component_open(struct snd_soc_component *component,
+			      struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+	struct snd_pcm_hardware hwparams;
+
+	/* only FE DAI links are handled here */
+	if (rtd->dai_link->no_pcm)
+		return 0;
+
+	hwparams.info = SNDRV_PCM_INFO_MMAP |
+			SNDRV_PCM_INFO_MMAP_VALID |
+			SNDRV_PCM_INFO_INTERLEAVED |
+			SNDRV_PCM_INFO_PAUSE |
+			SNDRV_PCM_INFO_NO_PERIOD_WAKEUP;
+
+	hwparams.formats = SNDRV_PCM_FMTBIT_S16_LE |
+			   SNDRV_PCM_FMTBIT_S24_LE |
+			   SNDRV_PCM_FMTBIT_S32_LE;
+	hwparams.period_bytes_min = 128;
+	hwparams.period_bytes_max = AZX_MAX_BUF_SIZE / 2;
+	hwparams.periods_min = 2;
+	hwparams.periods_max = AZX_MAX_FRAG;
+	hwparams.buffer_bytes_max = AZX_MAX_BUF_SIZE;
+	hwparams.fifo_size = 0;
+
+	return snd_soc_set_runtime_hwparams(substream, &hwparams);
+}
+
+static unsigned int avs_hda_stream_dpib_read(struct hdac_ext_stream *stream)
+{
+	return readl(hdac_stream(stream)->bus->remap_addr + AZX_REG_VS_SDXDPIB_XBASE +
+		     (AZX_REG_VS_SDXDPIB_XINTERVAL * hdac_stream(stream)->index));
+}
+
+static snd_pcm_uframes_t
+avs_component_pointer(struct snd_soc_component *component, struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+	struct avs_dma_data *data;
+	struct hdac_ext_stream *host_stream;
+	unsigned int pos;
+
+	data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+	if (!data->host_stream)
+		return 0;
+
+	host_stream = data->host_stream;
+	pos = avs_hda_stream_dpib_read(host_stream);
+
+	if (pos >= hdac_stream(host_stream)->bufsize)
+		pos = 0;
+
+	return bytes_to_frames(substream->runtime, pos);
+}
+
+static int avs_component_mmap(struct snd_soc_component *component,
+			      struct snd_pcm_substream *substream,
+			      struct vm_area_struct *vma)
+{
+	return snd_pcm_lib_default_mmap(substream, vma);
+}
+
+#define MAX_PREALLOC_SIZE	(32 * 1024 * 1024)
+
+static int avs_component_construct(struct snd_soc_component *component,
+				   struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0);
+	struct snd_pcm *pcm = rtd->pcm;
+
+	if (dai->driver->playback.channels_min)
+		snd_pcm_set_managed_buffer(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
+					   SNDRV_DMA_TYPE_DEV_SG, component->dev, 0,
+					   MAX_PREALLOC_SIZE);
+
+	if (dai->driver->capture.channels_min)
+		snd_pcm_set_managed_buffer(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
+					   SNDRV_DMA_TYPE_DEV_SG, component->dev, 0,
+					   MAX_PREALLOC_SIZE);
+
+	return 0;
+}
+
+static const struct snd_soc_component_driver avs_component_driver = {
+	.name			= "avs-pcm",
+	.probe			= avs_component_probe,
+	.remove			= avs_component_remove,
+	.open			= avs_component_open,
+	.pointer		= avs_component_pointer,
+	.mmap			= avs_component_mmap,
+	.pcm_construct		= avs_component_construct,
+	.module_get_upon_open	= 1, /* increment refcount when a pcm is opened */
+	.topology_name_prefix	= "intel/avs",
+	.non_legacy_dai_naming	= true,
+};
+
+__maybe_unused
+static int avs_soc_component_register(struct device *dev, const char *name,
+				      const struct snd_soc_component_driver *drv,
+				      struct snd_soc_dai_driver *cpu_dais, int num_cpu_dais)
+{
+	struct avs_soc_component *acomp;
+	int ret;
+
+	acomp = devm_kzalloc(dev, sizeof(*acomp), GFP_KERNEL);
+	if (!acomp)
+		return -ENOMEM;
+
+	ret = snd_soc_component_initialize(&acomp->base, drv, dev);
+	if (ret < 0)
+		return ret;
+
+	/* force name change after ASoC is done with its init */
+	acomp->base.name = name;
+	INIT_LIST_HEAD(&acomp->node);
+
+	return snd_soc_add_component(&acomp->base, cpu_dais, num_cpu_dais);
+}