ASoC: sm8250: add soundcard support

This patch adds basic MI2S playback over LS expansion port on dummy codec.

THIS PATCH SHOULD NOT BE UPSTREAMED!!!

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

3 files changed, 288 insertions, 0 deletions

diff --git a/sound/soc/qcom/Kconfig b/sound/soc/qcom/Kconfig
index f51b28d1b94d..493f04e472f9 100644
--- a/sound/soc/qcom/Kconfig
+++ b/sound/soc/qcom/Kconfig
@@ -109,3 +109,12 @@ config SND_SOC_SDM845
 	  To add support for audio on Qualcomm Technologies Inc.
 	  SDM845 SoC-based systems.
 	  Say Y if you want to use audio device on this SoCs.
+config SND_SOC_SM8250
+	tristate "SoC Machine driver for SM8250 boards"
+	depends on QCOM_APR
+	select SND_SOC_QDSP6
+	select SND_SOC_QCOM_COMMON
+	help
+	  To add support for audio on Qualcomm Technologies Inc.
+	  SM8250 SoC-based systems.
+	  Say Y if you want to use audio device on this SoCs.
diff --git a/sound/soc/qcom/Makefile b/sound/soc/qcom/Makefile
index 41b2c7a23a4d..8236eed36c22 100644
--- a/sound/soc/qcom/Makefile
+++ b/sound/soc/qcom/Makefile
@@ -15,12 +15,14 @@ snd-soc-storm-objs := storm.o
 snd-soc-apq8016-sbc-objs := apq8016_sbc.o
 snd-soc-apq8096-objs := apq8096.o
 snd-soc-sdm845-objs := sdm845.o
+snd-soc-sm8250-objs := sm8250.o
 snd-soc-qcom-common-objs := common.o
 
 obj-$(CONFIG_SND_SOC_STORM) += snd-soc-storm.o
 obj-$(CONFIG_SND_SOC_APQ8016_SBC) += snd-soc-apq8016-sbc.o
 obj-$(CONFIG_SND_SOC_MSM8996) += snd-soc-apq8096.o
 obj-$(CONFIG_SND_SOC_SDM845) += snd-soc-sdm845.o
+obj-$(CONFIG_SND_SOC_SM8250) += snd-soc-sm8250.o
 obj-$(CONFIG_SND_SOC_QCOM_COMMON) += snd-soc-qcom-common.o
 
 #DSP lib
diff --git a/sound/soc/qcom/sm8250.c b/sound/soc/qcom/sm8250.c
new file mode 100644
index 000000000000..8d6c3f84730b
--- /dev/null
+++ b/sound/soc/qcom/sm8250.c
@@ -0,0 +1,277 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020, Linaro Limited
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/pcm.h>
+#include "qdsp6/q6afe.h"
+
+#define MI2S_BCLK_RATE		1536000
+#define DEFAULT_MCLK_RATE	24576000
+
+static int sm8250_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
+				     struct snd_pcm_hw_params *params)
+{
+	struct snd_interval *rate = hw_param_interval(params,
+					SNDRV_PCM_HW_PARAM_RATE);
+	struct snd_interval *channels = hw_param_interval(params,
+					SNDRV_PCM_HW_PARAM_CHANNELS);
+
+	rate->min = rate->max = 48000;
+	channels->min = channels->max = 2;
+
+	return 0;
+}
+
+static int sm8250_snd_startup(struct snd_pcm_substream *substream)
+{
+	unsigned int fmt = SND_SOC_DAIFMT_CBS_CFS;
+	unsigned int codec_dai_fmt = SND_SOC_DAIFMT_CBS_CFS;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+
+	switch (cpu_dai->id) {
+	case PRIMARY_MI2S_RX:
+		codec_dai_fmt |= SND_SOC_DAIFMT_NB_NF;
+
+		snd_soc_dai_set_sysclk(cpu_dai,
+			Q6AFE_LPASS_CLK_ID_MCLK_1,
+			DEFAULT_MCLK_RATE, SNDRV_PCM_STREAM_PLAYBACK);
+
+		snd_soc_dai_set_sysclk(cpu_dai,
+			Q6AFE_LPASS_CLK_ID_PRI_MI2S_IBIT,
+			MI2S_BCLK_RATE, SNDRV_PCM_STREAM_PLAYBACK);
+		snd_soc_dai_set_fmt(cpu_dai, fmt);
+		snd_soc_dai_set_fmt(codec_dai, codec_dai_fmt);
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const struct snd_soc_ops sm8250_be_ops = {
+	.startup = sm8250_snd_startup,
+};
+
+static void sm8250_add_be_ops(struct snd_soc_card *card)
+{
+	struct snd_soc_dai_link *link;
+	int i;
+
+	for_each_card_prelinks(card, i, link) {
+		if (link->no_pcm == 1) {
+			link->be_hw_params_fixup = sm8250_be_hw_params_fixup;
+			link->ops = &sm8250_be_ops;
+		}
+	}
+}
+
+int sm8250_snd_parse_of(struct snd_soc_card *card)
+{
+	struct device_node *np;
+	struct device_node *codec = NULL;
+	struct device_node *platform = NULL;
+	struct device_node *cpu = NULL;
+	struct device *dev = card->dev;
+	struct snd_soc_dai_link *link;
+	struct of_phandle_args args;
+	struct snd_soc_dai_link_component *dlc;
+	int ret, num_links;
+
+	ret = snd_soc_of_parse_card_name(card, "model");
+	if (ret) {
+		dev_err(dev, "Error parsing card name: %d\n", ret);
+		return ret;
+	}
+
+	/* DAPM routes */
+	if (of_property_read_bool(dev->of_node, "audio-routing")) {
+		ret = snd_soc_of_parse_audio_routing(card,
+				"audio-routing");
+		if (ret)
+			return ret;
+	}
+
+	/* Populate links */
+	num_links = of_get_child_count(dev->of_node);
+
+	/* Allocate the DAI link array */
+	card->dai_link = kcalloc(num_links, sizeof(*link), GFP_KERNEL);
+	if (!card->dai_link)
+		return -ENOMEM;
+
+	card->num_links = num_links;
+	link = card->dai_link;
+
+	for_each_child_of_node(dev->of_node, np) {
+		dlc = devm_kzalloc(dev, 2 * sizeof(*dlc), GFP_KERNEL);
+		if (!dlc)
+			return -ENOMEM;
+
+		link->cpus	= &dlc[0];
+		link->platforms	= &dlc[1];
+
+		link->num_cpus		= 1;
+		link->num_platforms	= 1;
+
+		ret = of_property_read_string(np, "link-name", &link->name);
+		if (ret) {
+			dev_err(card->dev, "error getting codec dai_link name\n");
+			goto err;
+		}
+
+		cpu = of_get_child_by_name(np, "cpu");
+		platform = of_get_child_by_name(np, "platform");
+
+		if (!cpu) {
+			dev_err(dev, "%s: Can't find cpu DT node\n", link->name);
+			ret = -EINVAL;
+			goto err;
+		}
+
+		ret = of_parse_phandle_with_args(cpu, "sound-dai",
+					"#sound-dai-cells", 0, &args);
+		if (ret) {
+			dev_err(card->dev, "%s: error getting cpu phandle\n", link->name);
+			goto err;
+		}
+		link->cpus->of_node = args.np;
+		link->id = args.args[0];
+
+		ret = snd_soc_of_get_dai_name(cpu, &link->cpus->dai_name);
+		if (ret) {
+			dev_err(card->dev, "%s: error getting cpu dai name\n", link->name);
+			goto err;
+		}
+
+		if (platform) {
+			link->platforms->of_node = of_parse_phandle(platform,
+					"sound-dai",
+					0);
+			if (!link->platforms->of_node) {
+				dev_err(card->dev, "%s: platform dai not found\n", link->name);
+				ret = -EINVAL;
+				goto err;
+			}
+
+			dlc = devm_kzalloc(dev, sizeof(*dlc), GFP_KERNEL);
+			if (!dlc)
+				return -ENOMEM;
+
+			link->codecs	 = dlc;
+			link->num_codecs = 1;
+			link->codecs->dai_name = "snd-soc-dummy-dai";
+			link->codecs->name = "snd-soc-dummy";
+
+			link->dynamic = 1;
+			link->no_pcm = 1;
+			link->ignore_pmdown_time = 1;
+
+			if (q6afe_is_rx_port(link->id)) {
+				link->dpcm_playback = 1;
+				link->dpcm_capture = 0;
+			} else {
+				link->dpcm_playback = 0;
+				link->dpcm_capture = 1;
+			}
+
+		} else {
+			dlc = devm_kzalloc(dev, sizeof(*dlc), GFP_KERNEL);
+			if (!dlc)
+				return -ENOMEM;
+
+			link->codecs	 = dlc;
+			link->num_codecs = 1;
+
+			link->platforms->of_node = link->cpus->of_node;
+			link->codecs->dai_name = "snd-soc-dummy-dai";
+			link->codecs->name = "snd-soc-dummy";
+			link->dynamic = 1;
+			link->dpcm_playback = 1;
+			link->dpcm_capture = 1;
+		}
+
+		link->ignore_suspend = 1;
+		link->nonatomic = 1;
+		link->stream_name = link->name;
+		link++;
+
+		of_node_put(cpu);
+		of_node_put(platform);
+	}
+
+	return 0;
+err:
+	of_node_put(np);
+	of_node_put(cpu);
+	of_node_put(codec);
+	of_node_put(platform);
+	kfree(card->dai_link);
+	return ret;
+}
+
+static int sm8250_platform_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	card = kzalloc(sizeof(*card), GFP_KERNEL);
+	if (!card)
+		return -ENOMEM;
+
+	card->dev = dev;
+	dev_set_drvdata(dev, card);
+	ret = sm8250_snd_parse_of(card);
+	if (ret)
+		goto err;
+
+	sm8250_add_be_ops(card);
+	ret = snd_soc_register_card(card);
+	if (ret)
+		goto err_card_register;
+
+	return 0;
+
+err_card_register:
+	kfree(card->dai_link);
+err:
+	kfree(card);
+	return ret;
+}
+
+static int sm8250_platform_remove(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = dev_get_drvdata(&pdev->dev);
+
+	snd_soc_unregister_card(card);
+	kfree(card->dai_link);
+	kfree(card);
+
+	return 0;
+}
+
+static const struct of_device_id snd_sm8250_dt_match[] = {
+	{.compatible = "qcom,sm8250-sndcard"},
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, snd_sm8250_dt_match);
+
+static struct platform_driver snd_sm8250_driver = {
+	.probe  = sm8250_platform_probe,
+	.remove = sm8250_platform_remove,
+	.driver = {
+		.name = "snd-sm8250",
+		.of_match_table = snd_sm8250_dt_match,
+	},
+};
+module_platform_driver(snd_sm8250_driver);
+MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org");
+MODULE_DESCRIPTION("SM8250 ASoC Machine Driver");
+MODULE_LICENSE("GPL v2");