msm: CDSP: Enable CDSP loader driver (5a8b3103) · Commits · e / devices / android_kernel_fairphone_FP3

Documentation/devicetree/bindings/qdsp/msm-cdsp-loader.txt

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		Qualcomm Technologies, Inc. CDSP Loader Driver

		msm-cdsp-loader driver implements the mechanism that allows to load CDSP firmware images.

		Required properties:

		- compatible: This must be "qcom,msm-cdsp-loader".
		- qcom,proc-img-to-load: CDSP firmware name, must be "cdsp".

		Example:
		The following for sdm660.

		qcom,msm-cdsp-loader {
		compatible = "qcom,cdsp-loader";
		qcom,proc-img-to-load = "cdsp";
		};

drivers/soc/qcom/Kconfig

+9 −0

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		@@ -525,6 +525,15 @@ config MSM_ADSP_LOADER
		for the platforms that use APRv2.
		Say M if you want to enable this module.

		config MSM_CDSP_LOADER
		tristate "CDSP loader support"
		depends on MSM_GLINK
		help
		Enable CDSP image loader.
		The CDSP loader brings CDSP out of reset
		for platforms that have compute DSP.
		Say M if you want to enable this module.

		config MSM_AVTIMER
		tristate "Avtimer Driver"
		depends on MSM_QDSP6_APRV2_GLINK \|\| MSM_QDSP6_APRV3_GLINK

drivers/soc/qcom/qdsp6v2/Makefile

+1 −0

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		@@ -7,3 +7,4 @@ obj-$(CONFIG_MSM_ADSP_LOADER) += adsp-loader.o
		obj-$(CONFIG_MSM_QDSP6_SSR) += audio_ssr.o
		obj-$(CONFIG_MSM_QDSP6_PDR) += audio_pdr.o
		obj-$(CONFIG_MSM_QDSP6_NOTIFIER) += audio_notifier.o
		obj-$(CONFIG_MSM_CDSP_LOADER) += cdsp-loader.o

drivers/soc/qcom/qdsp6v2/cdsp-loader.c

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		/*
		* Copyright (c) 2012-2014, 2017, The Linux Foundation. All rights reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 and
		* only version 2 as published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*/

		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/err.h>
		#include <linux/delay.h>
		#include <linux/platform_device.h>
		#include <linux/of_device.h>
		#include <linux/sysfs.h>
		#include <soc/qcom/subsystem_restart.h>

		#define BOOT_CMD 1
		#define IMAGE_UNLOAD_CMD 0

		#define CDSP_SUBSYS_DOWN 0
		#define CDSP_SUBSYS_LOADED 1

		static ssize_t cdsp_boot_store(struct kobject *kobj,
		struct kobj_attribute *attr,
		const char *buf, size_t count);

		struct cdsp_loader_private {
		void *pil_h;
		struct kobject *boot_cdsp_obj;
		struct attribute_group *attr_group;
		};

		static struct kobj_attribute cdsp_boot_attribute =
		__ATTR(boot, 0220, NULL, cdsp_boot_store);

		static struct attribute *attrs[] = {
		&cdsp_boot_attribute.attr,
		NULL,
		};

		static u32 cdsp_state = CDSP_SUBSYS_DOWN;
		static struct platform_device *cdsp_private;
		static void cdsp_loader_unload(struct platform_device *pdev);

		static int cdsp_loader_do(struct platform_device *pdev)
		{
		struct cdsp_loader_private *priv = NULL;

		int rc = 0;
		const char *img_name;

		if (!pdev) {
		dev_err(&pdev->dev, "%s: Platform device null\n", __func__);
		goto fail;
		}

		if (!pdev->dev.of_node) {
		dev_err(&pdev->dev,
		"%s: Device tree information missing\n", __func__);

		goto fail;
		}

		rc = of_property_read_string(pdev->dev.of_node,
		"qcom,proc-img-to-load",
		&img_name);
		if (rc)
		goto fail;

		if (!strcmp(img_name, "cdsp")) {
		/* cdsp_state always returns "0".*/
		if (cdsp_state == CDSP_SUBSYS_DOWN) {
		priv = platform_get_drvdata(pdev);
		if (!priv) {
		dev_err(&pdev->dev,
		" %s: Private data get failed\n", __func__);
		goto fail;
		}

		priv->pil_h = subsystem_get("cdsp");
		if (IS_ERR(priv->pil_h)) {
		dev_err(&pdev->dev, "%s: pil get failed,\n",
		__func__);
		goto fail;
		}

		/* Set the state of the CDSP.*/
		cdsp_state = CDSP_SUBSYS_LOADED;
		} else if (cdsp_state == CDSP_SUBSYS_LOADED) {
		dev_dbg(&pdev->dev,
		"%s: CDSP state = %x\n", __func__, cdsp_state);
		}

		dev_dbg(&pdev->dev, "%s: CDSP image is loaded\n", __func__);
		return rc;
		}

		fail:
		dev_err(&pdev->dev, "%s: CDSP image loading failed\n", __func__);
		return rc;
		}


		static ssize_t cdsp_boot_store(struct kobject *kobj,
		struct kobj_attribute *attr,
		const char *buf,
		size_t count)
		{
		int boot = 0, ret = 0;

		ret = sscanf(buf, "%du", &boot);

		if (ret != 1)
		pr_debug("%s: invalid arguments for cdsp_loader.\n", __func__);

		if (boot == BOOT_CMD) {
		pr_debug("%s: going to call cdsp_loader_do\n", __func__);
		cdsp_loader_do(cdsp_private);
		} else if (boot == IMAGE_UNLOAD_CMD) {
		pr_debug("%s: going to call adsp_unloader\n", __func__);
		cdsp_loader_unload(cdsp_private);
		}
		return count;
		}

		static void cdsp_loader_unload(struct platform_device *pdev)
		{
		struct cdsp_loader_private *priv = NULL;

		priv = platform_get_drvdata(pdev);

		if (!priv)
		return;

		if (priv->pil_h) {
		dev_dbg(&pdev->dev, "%s: calling subsystem put\n", __func__);
		subsystem_put(priv->pil_h);
		priv->pil_h = NULL;
		}
		}

		static int cdsp_loader_init_sysfs(struct platform_device *pdev)
		{
		int ret = -EINVAL;
		struct cdsp_loader_private *priv = NULL;

		cdsp_private = NULL;

		priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
		if (!priv) {
		ret = -ENOMEM;
		return ret;
		}

		platform_set_drvdata(pdev, priv);

		priv->pil_h = NULL;
		priv->boot_cdsp_obj = NULL;
		priv->attr_group = devm_kzalloc(&pdev->dev,
		sizeof(*(priv->attr_group)),
		GFP_KERNEL);
		if (!priv->attr_group) {
		dev_err(&pdev->dev, "%s: malloc attr_group failed\n",
		__func__);
		ret = -ENOMEM;
		goto error_return;
		}

		priv->attr_group->attrs = attrs;

		priv->boot_cdsp_obj = kobject_create_and_add("boot_cdsp", kernel_kobj);
		if (!priv->boot_cdsp_obj) {
		dev_err(&pdev->dev, "%s: sysfs create and add failed\n",
		__func__);
		ret = -ENOMEM;
		goto error_return;
		}

		ret = sysfs_create_group(priv->boot_cdsp_obj, priv->attr_group);
		if (ret) {
		dev_err(&pdev->dev, "%s: sysfs create group failed %d\n",
		__func__, ret);
		goto error_return;
		}

		cdsp_private = pdev;

		return 0;

		error_return:

		if (priv->boot_cdsp_obj) {
		kobject_del(priv->boot_cdsp_obj);
		priv->boot_cdsp_obj = NULL;
		}

		return ret;
		}

		static int cdsp_loader_remove(struct platform_device *pdev)
		{
		struct cdsp_loader_private *priv = NULL;

		priv = platform_get_drvdata(pdev);

		if (!priv)
		return 0;

		if (priv->pil_h) {
		subsystem_put(priv->pil_h);
		priv->pil_h = NULL;
		}

		if (priv->boot_cdsp_obj) {
		sysfs_remove_group(priv->boot_cdsp_obj, priv->attr_group);
		kobject_del(priv->boot_cdsp_obj);
		priv->boot_cdsp_obj = NULL;
		}

		return 0;
		}

		static int cdsp_loader_probe(struct platform_device *pdev)
		{
		int ret = cdsp_loader_init_sysfs(pdev);

		if (ret != 0) {
		dev_err(&pdev->dev, "%s: Error in initing sysfs\n", __func__);
		return ret;
		}

		return 0;
		}

		static const struct of_device_id cdsp_loader_dt_match[] = {
		{ .compatible = "qcom,cdsp-loader" },
		{ }
		};
		MODULE_DEVICE_TABLE(of, cdsp_loader_dt_match);

		static struct platform_driver cdsp_loader_driver = {
		.driver = {
		.name = "cdsp-loader",
		.owner = THIS_MODULE,
		.of_match_table = cdsp_loader_dt_match,
		},
		.probe = cdsp_loader_probe,
		.remove = cdsp_loader_remove,
		};

		static int __init cdsp_loader_init(void)
		{
		return platform_driver_register(&cdsp_loader_driver);
		}
		module_init(cdsp_loader_init);

		static void __exit cdsp_loader_exit(void)
		{
		platform_driver_unregister(&cdsp_loader_driver);
		}
		module_exit(cdsp_loader_exit);

		MODULE_DESCRIPTION("CDSP Loader module");
		MODULE_LICENSE("GPL v2");