[PATCH v2 3/5] ASoC: SOF: Add DT DSP device support

[Daniel Baluta]

Add support for device tree based SOF DSP devices.

Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxx>
---
This is also on review with SOF community here:
https://github.com/thesofproject/linux/pull/1048

 sound/soc/sof/Kconfig      |   9 +++
 sound/soc/sof/Makefile     |   3 +
 sound/soc/sof/imx/Kconfig  |   1 +
 sound/soc/sof/sof-dt-dev.c | 159 +++++++++++++++++++++++++++++++++++++
 4 files changed, 172 insertions(+)
 create mode 100644 sound/soc/sof/sof-dt-dev.c

diff --git a/sound/soc/sof/Kconfig b/sound/soc/sof/Kconfig
index 61b97fc55bb2..2aa3a1cdf60c 100644
--- a/sound/soc/sof/Kconfig
+++ b/sound/soc/sof/Kconfig
@@ -36,6 +36,15 @@ config SND_SOC_SOF_ACPI
 	  Say Y if you need this option
 	  If unsure select "N".
 
+config SND_SOC_SOF_DT
+	tristate "SOF DT enumeration support"
+	select SND_SOC_SOF
+	select SND_SOC_SOF_OPTIONS
+	help
+	  This adds support for Device Tree enumeration. This option is
+	  required to enable i.MX8 devices.
+	  Say Y if you need this option. If unsure select "N".
+
 config SND_SOC_SOF_OPTIONS
 	tristate
 	help
diff --git a/sound/soc/sof/Makefile b/sound/soc/sof/Makefile
index 6e43d411ffef..8025d9cec4fb 100644
--- a/sound/soc/sof/Makefile
+++ b/sound/soc/sof/Makefile
@@ -5,6 +5,8 @@ snd-sof-objs := core.o ops.o loader.o ipc.o pcm.o pm.o debug.o topology.o\
 
 snd-sof-pci-objs := sof-pci-dev.o
 snd-sof-acpi-objs := sof-acpi-dev.o
+snd-sof-dt-objs := sof-dt-dev.o
+
 snd-sof-nocodec-objs := nocodec.o
 
 obj-$(CONFIG_SND_SOC_SOF) += snd-sof.o
@@ -12,6 +14,7 @@ obj-$(CONFIG_SND_SOC_SOF_NOCODEC) += snd-sof-nocodec.o
 
 
 obj-$(CONFIG_SND_SOC_SOF_ACPI) += sof-acpi-dev.o
+obj-$(CONFIG_SND_SOC_SOF_DT) += sof-dt-dev.o
 obj-$(CONFIG_SND_SOC_SOF_PCI) += sof-pci-dev.o
 
 obj-$(CONFIG_SND_SOC_SOF_INTEL_TOPLEVEL) += intel/
diff --git a/sound/soc/sof/imx/Kconfig b/sound/soc/sof/imx/Kconfig
index fff64a9970f0..fa35994a79c4 100644
--- a/sound/soc/sof/imx/Kconfig
+++ b/sound/soc/sof/imx/Kconfig
@@ -12,6 +12,7 @@ if SND_SOC_SOF_IMX_TOPLEVEL
 
 config SND_SOC_SOF_IMX8
 	tristate "SOF support for i.MX8"
+	select SND_SOC_SOF_DT
 	help
           This adds support for Sound Open Firmware for NXP i.MX8 platforms
           Say Y if you have such a device.
diff --git a/sound/soc/sof/sof-dt-dev.c b/sound/soc/sof/sof-dt-dev.c
new file mode 100644
index 000000000000..31429bbb5c7e
--- /dev/null
+++ b/sound/soc/sof/sof-dt-dev.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+//
+// Copyright 2019 NXP
+//
+// Author: Daniel Baluta <daniel.baluta@xxxxxxx>
+//
+
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <sound/sof.h>
+
+#include "ops.h"
+
+extern struct snd_sof_dsp_ops sof_imx8_ops;
+
+static char *fw_path;
+module_param(fw_path, charp, 0444);
+MODULE_PARM_DESC(fw_path, "alternate path for SOF firmware.");
+
+static char *tplg_path;
+module_param(tplg_path, charp, 0444);
+MODULE_PARM_DESC(tplg_path, "alternate path for SOF topology.");
+
+/* platform specific devices */
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_IMX8)
+static struct sof_dev_desc sof_dt_imx8qxp_desc = {
+	.default_fw_path = "imx/sof",
+	.default_tplg_path = "imx/sof-tplg",
+	.nocodec_fw_filename = "sof-imx8.ri",
+	.nocodec_tplg_filename = "sof-imx8-nocodec.tplg",
+	.ops = &sof_imx8_ops,
+};
+#endif
+
+static const struct dev_pm_ops sof_dt_pm = {
+	SET_SYSTEM_SLEEP_PM_OPS(snd_sof_suspend, snd_sof_resume)
+	SET_RUNTIME_PM_OPS(snd_sof_runtime_suspend, snd_sof_runtime_resume,
+			   NULL)
+};
+
+static void sof_dt_probe_complete(struct device *dev)
+{
+	/* allow runtime_pm */
+	pm_runtime_set_autosuspend_delay(dev, SND_SOF_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_enable(dev);
+}
+
+static int sof_dt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct sof_dev_desc *desc;
+	/*TODO: create a generic snd_soc_xxx_mach */
+	struct snd_soc_acpi_mach *mach;
+	struct snd_sof_pdata *sof_pdata;
+	const struct snd_sof_dsp_ops *ops;
+	int ret;
+
+	dev_info(&pdev->dev, "DT DSP detected");
+
+	sof_pdata = devm_kzalloc(dev, sizeof(*sof_pdata), GFP_KERNEL);
+	if (!sof_pdata)
+		return -ENOMEM;
+
+	desc = device_get_match_data(dev);
+	if (!desc)
+		return -ENODEV;
+
+	/* get ops for platform */
+	ops = desc->ops;
+	if (!ops) {
+		dev_err(dev, "error: no matching DT descriptor ops\n");
+		return -ENODEV;
+	}
+
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_FORCE_NOCODEC_MODE)
+	/* force nocodec mode */
+	dev_warn(dev, "Force to use nocodec mode\n");
+	mach = devm_kzalloc(dev, sizeof(*mach), GFP_KERNEL);
+	if (!mach)
+		return -ENOMEM;
+	ret = sof_nocodec_setup(dev, sof_pdata, mach, desc, ops);
+	if (ret < 0)
+		return ret;
+#else
+	/* TODO: implement case where we actually have a codec */
+	return -ENODEV;
+#endif
+
+	if (mach)
+		mach->mach_params.platform = dev_name(dev);
+
+	sof_pdata->machine = mach;
+	sof_pdata->desc = desc;
+	sof_pdata->dev = &pdev->dev;
+	sof_pdata->platform = dev_name(dev);
+
+	/* alternate fw and tplg filenames */
+	if (fw_path)
+		sof_pdata->fw_filename_prefix = fw_path;
+	else
+		sof_pdata->fw_filename_prefix =
+			sof_pdata->desc->default_fw_path;
+	if (tplg_path)
+		sof_pdata->tplg_filename_prefix = tplg_path;
+	else
+		sof_pdata->tplg_filename_prefix =
+			sof_pdata->desc->default_tplg_path;
+
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE)
+	/* set callback to enable runtime_pm */
+	sof_pdata->sof_probe_complete = sof_dt_probe_complete;
+#endif
+	 /* call sof helper for DSP hardware probe */
+	ret = snd_sof_device_probe(dev, sof_pdata);
+	if (ret) {
+		dev_err(dev, "error: failed to probe DSP hardware\n");
+		return ret;
+	}
+
+#if !IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE)
+	sof_dt_probe_complete(dev);
+#endif
+
+	return ret;
+}
+
+static int sof_dt_remove(struct platform_device *pdev)
+{
+	pm_runtime_disable(&pdev->dev);
+
+	/* call sof helper for DSP hardware remove */
+	snd_sof_device_remove(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id sof_dt_ids[] = {
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_IMX8)
+	{ .compatible = "fsl,imx8qxp-dsp", .data = &sof_dt_imx8qxp_desc},
+#endif
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sof_dt_ids);
+
+/* DT driver definition */
+static struct platform_driver snd_sof_dt_driver = {
+	.probe = sof_dt_probe,
+	.remove = sof_dt_remove,
+	.driver = {
+		.name = "sof-audio-dt",
+		.pm = &sof_dt_pm,
+		.of_match_table = sof_dt_ids
+	},
+};
+module_platform_driver(snd_sof_dt_driver);
+
+MODULE_LICENSE("Dual BSD/GPL");
-- 
2.17.1