drivers/coresight/coresight-fuse.c - kernel/msm - Git at Google

 /* Copyright (c) 2013-2015, 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/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_coresight.h>
 #include <linux/of_device.h>
 #include <linux/coresight.h>

 #include "coresight-priv.h"

 #define fuse_writel(drvdata, val, off)	__raw_writel((val), drvdata->base + off)
 #define fuse_readl(drvdata, off)	__raw_readl(drvdata->base + off)

 #define OEM_CONFIG0		(0x000)
 #define OEM_CONFIG1		(0x004)
 #define OEM_CONFIG2		(0x008)
 #define FEATURE_CONFIG2		(0x000)

 #define CORESIGHT_FUSE_VERSION_V1		"arm,coresight-fuse"
 #define CORESIGHT_FUSE_VERSION_V2		"arm,coresight-fuse-v2"
 #define CORESIGHT_FUSE_VERSION_V3		"arm,coresight-fuse-v3"

 /* CoreSight FUSE V1 */
 #define ALL_DEBUG_DISABLE	BIT(21)
 #define APPS_DBGEN_DISABLE	BIT(0)
 #define APPS_NIDEN_DISABLE	BIT(1)
 #define APPS_SPIDEN_DISABLE	BIT(2)
 #define APPS_SPNIDEN_DISABLE	BIT(3)
 #define DAP_DBGEN_DISABLE	BIT(4)
 #define DAP_NIDEN_DISABLE	BIT(5)
 #define DAP_SPIDEN_DISABLE	BIT(6)
 #define DAP_SPNIDEN_DISABLE	BIT(7)
 #define DAP_DEVICEEN_DISABLE	BIT(8)

 /* CoreSight FUSE V2 */
 #define ALL_DEBUG_DISABLE_V2		BIT(0)
 #define APPS_DBGEN_DISABLE_V2		BIT(10)
 #define APPS_NIDEN_DISABLE_V2		BIT(11)
 #define APPS_SPIDEN_DISABLE_V2		BIT(12)
 #define APPS_SPNIDEN_DISABLE_V2	BIT(13)
 #define DAP_DBGEN_DISABLE_V2		BIT(14)
 #define DAP_NIDEN_DISABLE_V2		BIT(15)
 #define DAP_SPIDEN_DISABLE_V2		BIT(16)
 #define DAP_SPNIDEN_DISABLE_V2		BIT(17)
 #define DAP_DEVICEEN_DISABLE_V2	BIT(18)

 /* CoreSight FUSE V3 */
 #define ALL_DEBUG_DISABLE_V3		BIT(29)
 #define APPS_DBGEN_DISABLE_V3		BIT(8)
 #define APPS_NIDEN_DISABLE_V3		BIT(21)
 #define APPS_SPIDEN_DISABLE_V3		BIT(5)
 #define APPS_SPNIDEN_DISABLE_V3		BIT(31)
 #define DAP_DBGEN_DISABLE_V3		BIT(10)
 #define DAP_NIDEN_DISABLE_V3		BIT(23)
 #define DAP_SPIDEN_DISABLE_V3		BIT(7)
 #define DAP_SPNIDEN_DISABLE_V3		BIT(1)
 #define DAP_DEVICEEN_DISABLE_V3		BIT(7)

 #define QPDI_SPMI_DISABLE	BIT(2)
 #define NIDNT_DISABLE	BIT(27)

 struct fuse_nidnt {
 	void __iomem        *base;
 };

 struct fuse_qpdi {
 	void __iomem		*base;
 };

 struct fuse_drvdata {
 	void __iomem		*base;
 	struct fuse_nidnt	*fuse_nidnt;
 	struct fuse_qpdi	*qpdi;
 	struct device		*dev;
 	struct coresight_device	*csdev;
 	bool			fuse_v2;
 	bool			fuse_v3;
 };

 static struct fuse_drvdata *fusedrvdata;

 bool coresight_fuse_nidnt_access_disabled(void)
 {
 	struct fuse_drvdata *drvdata = fusedrvdata;
 	uint32_t nidnt_fuse;
 	bool ret;

 	if (!drvdata || !drvdata->fuse_nidnt)
 		return false;

 	nidnt_fuse = fuse_readl(drvdata->fuse_nidnt, 0);

 	dev_dbg(drvdata->dev, "nidnt_fuse: %lx\n", (unsigned long)nidnt_fuse);

 	if (nidnt_fuse & NIDNT_DISABLE)
 		ret = true;
 	else
 		ret = false;

 	if (ret)
 		dev_dbg(drvdata->dev, "coresight nidnt fuse disabled\n");

 	return ret;
 }
 EXPORT_SYMBOL(coresight_fuse_nidnt_access_disabled);

 bool coresight_fuse_access_disabled(void)
 {
 	struct fuse_drvdata *drvdata = fusedrvdata;
 	uint32_t config0, config1, config2;
 	bool ret = false;

 	if (!drvdata)
 		return false;

 	config0 = fuse_readl(drvdata, OEM_CONFIG0);
 	config1 = fuse_readl(drvdata, OEM_CONFIG1);

 	dev_dbg(drvdata->dev, "config0: %lx\n", (unsigned long)config0);
 	dev_dbg(drvdata->dev, "config1: %lx\n", (unsigned long)config1);

 	if (drvdata->fuse_v3) {
 		config2 = fuse_readl(drvdata, OEM_CONFIG2);
 		dev_dbg(drvdata->dev, "config2: %lx\n", (unsigned long)config2);
 	}

 	if (drvdata->fuse_v2) {
 		if (config1 & ALL_DEBUG_DISABLE_V2)
 			ret = true;
 		else if (config1 & DAP_DBGEN_DISABLE_V2)
 			ret = true;
 		else if (config1 & DAP_NIDEN_DISABLE_V2)
 			ret = true;
 		else if (config1 & DAP_SPIDEN_DISABLE_V2)
 			ret = true;
 		else if (config1 & DAP_SPNIDEN_DISABLE_V2)
 			ret = true;
 		else if (config1 & DAP_DEVICEEN_DISABLE_V2)
 			ret = true;
 	} else if (drvdata->fuse_v3) {
 		if (config0 & ALL_DEBUG_DISABLE_V3)
 			ret = true;
 		else if (config1 & DAP_DBGEN_DISABLE_V3)
 			ret = true;
 		else if (config1 & DAP_NIDEN_DISABLE_V3)
 			ret = true;
 		else if (config2 & DAP_SPIDEN_DISABLE_V3)
 			ret = true;
 		else if (config2 & DAP_SPNIDEN_DISABLE_V3)
 			ret = true;
 		else if (config1 & DAP_DEVICEEN_DISABLE_V3)
 			ret = true;
 	} else {
 		if (config0 & ALL_DEBUG_DISABLE)
 			ret = true;
 		else if (config1 & DAP_DBGEN_DISABLE)
 			ret = true;
 		else if (config1 & DAP_NIDEN_DISABLE)
 			ret = true;
 		else if (config1 & DAP_SPIDEN_DISABLE)
 			ret = true;
 		else if (config1 & DAP_SPNIDEN_DISABLE)
 			ret = true;
 		else if (config1 & DAP_DEVICEEN_DISABLE)
 			ret = true;
 	}

 	if (ret)
 		dev_dbg(drvdata->dev, "coresight fuse disabled\n");

 	return ret;
 }
 EXPORT_SYMBOL(coresight_fuse_access_disabled);

 bool coresight_fuse_apps_access_disabled(void)
 {
 	struct fuse_drvdata *drvdata = fusedrvdata;
 	uint32_t config0, config1, config2;
 	bool ret = false;

 	if (!drvdata)
 		return false;

 	config0 = fuse_readl(drvdata, OEM_CONFIG0);
 	config1 = fuse_readl(drvdata, OEM_CONFIG1);

 	dev_dbg(drvdata->dev, "apps config0: %lx\n", (unsigned long)config0);
 	dev_dbg(drvdata->dev, "apps config1: %lx\n", (unsigned long)config1);

 	if (drvdata->fuse_v3) {
 		config2 = fuse_readl(drvdata, OEM_CONFIG2);
 		dev_dbg(drvdata->dev, "apps config2: %lx\n",
 		       (unsigned long)config2);
 	}

 	if (drvdata->fuse_v2) {
 		if (config1 & ALL_DEBUG_DISABLE_V2)
 			ret = true;
 		else if (config1 & APPS_DBGEN_DISABLE_V2)
 			ret = true;
 		else if (config1 & APPS_NIDEN_DISABLE_V2)
 			ret = true;
 		else if (config1 & APPS_SPIDEN_DISABLE_V2)
 			ret = true;
 		else if (config1 & APPS_SPNIDEN_DISABLE_V2)
 			ret = true;
 		else if (config1 & DAP_DEVICEEN_DISABLE_V2)
 			ret = true;
 	} else if (drvdata->fuse_v3) {
 		if (config0 & ALL_DEBUG_DISABLE_V3)
 			ret = true;
 		else if (config1 & APPS_DBGEN_DISABLE_V3)
 			ret = true;
 		else if (config1 & APPS_NIDEN_DISABLE_V3)
 			ret = true;
 		else if (config2 & APPS_SPIDEN_DISABLE_V3)
 			ret = true;
 		else if (config1 & APPS_SPNIDEN_DISABLE_V3)
 			ret = true;
 		else if (config1 & DAP_DEVICEEN_DISABLE_V3)
 			ret = true;
 	} else {
 		if (config0 & ALL_DEBUG_DISABLE)
 			ret = true;
 		else if (config1 & APPS_DBGEN_DISABLE)
 			ret = true;
 		else if (config1 & APPS_NIDEN_DISABLE)
 			ret = true;
 		else if (config1 & APPS_SPIDEN_DISABLE)
 			ret = true;
 		else if (config1 & APPS_SPNIDEN_DISABLE)
 			ret = true;
 		else if (config1 & DAP_DEVICEEN_DISABLE)
 			ret = true;
 	}

 	if (ret)
 		dev_dbg(drvdata->dev, "apps fuse disabled\n");

 	return ret;
 }
 EXPORT_SYMBOL(coresight_fuse_apps_access_disabled);

 bool coresight_fuse_qpdi_access_disabled(void)
 {
 	struct fuse_drvdata *drvdata = fusedrvdata;
 	uint32_t config;

 	if (!drvdata || !drvdata->qpdi)
 		return false;

 	config = fuse_readl(drvdata->qpdi, FEATURE_CONFIG2);

 	dev_dbg(drvdata->dev, "qpdi config: %lx\n", (unsigned long)config);

 	if (config & QPDI_SPMI_DISABLE) {
 		dev_dbg(drvdata->dev, "qpdi fuse disabled\n");
 		return true;
 	} else {
 		return false;
 	}
 }
 EXPORT_SYMBOL(coresight_fuse_qpdi_access_disabled);

 static struct of_device_id fuse_match[] = {
 	{.compatible = CORESIGHT_FUSE_VERSION_V1 },
 	{.compatible = CORESIGHT_FUSE_VERSION_V2 },
 	{.compatible = CORESIGHT_FUSE_VERSION_V3 },
 	{}
 };

 static int fuse_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct coresight_platform_data *pdata;
 	struct fuse_drvdata *drvdata;
 	struct resource *res;
 	struct coresight_desc *desc;
 	const struct of_device_id *match;

 	if (pdev->dev.of_node) {
 		pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 		pdev->dev.platform_data = pdata;
 	}

 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 	/* Store the driver data pointer for use in exported functions */
 	fusedrvdata = drvdata;
 	drvdata->dev = &pdev->dev;
 	platform_set_drvdata(pdev, drvdata);

 	match = of_match_device(fuse_match, dev);
 	if (!match)
 		return -EINVAL;

 	if (!strcmp(match->compatible, CORESIGHT_FUSE_VERSION_V2))
 		drvdata->fuse_v2 = true;
 	else if (!strcmp(match->compatible, CORESIGHT_FUSE_VERSION_V3))
 		drvdata->fuse_v3 = true;

 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fuse-base");
 	if (!res)
 		return -ENODEV;

 	drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
 	if (!drvdata->base)
 		return -ENOMEM;

 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 					   "qpdi-fuse-base");
 	if (res) {
 		drvdata->qpdi = devm_kzalloc(dev, sizeof(*drvdata->qpdi),
 					     GFP_KERNEL);
 		if (!drvdata->qpdi)
 			return -ENOMEM;

 		drvdata->qpdi->base = devm_ioremap(dev, res->start,
 						   resource_size(res));
 		if (!drvdata->qpdi->base)
 			return -ENOMEM;
 	} else {
 		dev_info(dev, "QPDI fuse not specified\n");
 	}

 	res = platform_get_resource_byname(pdev,
 					   IORESOURCE_MEM,
 					   "nidnt-fuse-base");
 	if (res) {
 		drvdata->fuse_nidnt = devm_kzalloc(dev,
 						   sizeof(*drvdata->fuse_nidnt),
 						   GFP_KERNEL);
 		if (!drvdata->fuse_nidnt)
 			return -ENOMEM;

 		drvdata->fuse_nidnt->base = devm_ioremap(dev, res->start,
 							 resource_size(res));
 		if (!drvdata->fuse_nidnt->base)
 			return -ENOMEM;
 	}

 	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 	if (!desc)
 		return -ENOMEM;
 	desc->type = CORESIGHT_DEV_TYPE_NONE;
 	desc->pdata = pdev->dev.platform_data;
 	desc->dev = &pdev->dev;
 	desc->owner = THIS_MODULE;
 	drvdata->csdev = coresight_register(desc);
 	if (IS_ERR(drvdata->csdev))
 		return PTR_ERR(drvdata->csdev);

 	dev_info(dev, "Fuse initialized\n");
 	return 0;
 }

 static int fuse_remove(struct platform_device *pdev)
 {
 	struct fuse_drvdata *drvdata = platform_get_drvdata(pdev);

 	coresight_unregister(drvdata->csdev);
 	return 0;
 }

 static struct platform_driver fuse_driver = {
 	.probe          = fuse_probe,
 	.remove         = fuse_remove,
 	.driver         = {
 		.name   = "coresight-fuse",
 		.owner	= THIS_MODULE,
 		.of_match_table = fuse_match,
 	},
 };

 static int __init fuse_init(void)
 {
 	return platform_driver_register(&fuse_driver);
 }
 module_init(fuse_init);

 static void __exit fuse_exit(void)
 {
 	platform_driver_unregister(&fuse_driver);
 }
 module_exit(fuse_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("CoreSight Fuse driver");
	/* Copyright (c) 2013-2015, 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/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/of_coresight.h>
	#include <linux/of_device.h>
	#include <linux/coresight.h>

	#include "coresight-priv.h"

	#define fuse_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
	#define fuse_readl(drvdata, off) __raw_readl(drvdata->base + off)

	#define OEM_CONFIG0 (0x000)
	#define OEM_CONFIG1 (0x004)
	#define OEM_CONFIG2 (0x008)
	#define FEATURE_CONFIG2 (0x000)

	#define CORESIGHT_FUSE_VERSION_V1 "arm,coresight-fuse"
	#define CORESIGHT_FUSE_VERSION_V2 "arm,coresight-fuse-v2"
	#define CORESIGHT_FUSE_VERSION_V3 "arm,coresight-fuse-v3"

	/* CoreSight FUSE V1 */
	#define ALL_DEBUG_DISABLE BIT(21)
	#define APPS_DBGEN_DISABLE BIT(0)
	#define APPS_NIDEN_DISABLE BIT(1)
	#define APPS_SPIDEN_DISABLE BIT(2)
	#define APPS_SPNIDEN_DISABLE BIT(3)
	#define DAP_DBGEN_DISABLE BIT(4)
	#define DAP_NIDEN_DISABLE BIT(5)
	#define DAP_SPIDEN_DISABLE BIT(6)
	#define DAP_SPNIDEN_DISABLE BIT(7)
	#define DAP_DEVICEEN_DISABLE BIT(8)

	/* CoreSight FUSE V2 */
	#define ALL_DEBUG_DISABLE_V2 BIT(0)
	#define APPS_DBGEN_DISABLE_V2 BIT(10)
	#define APPS_NIDEN_DISABLE_V2 BIT(11)
	#define APPS_SPIDEN_DISABLE_V2 BIT(12)
	#define APPS_SPNIDEN_DISABLE_V2 BIT(13)
	#define DAP_DBGEN_DISABLE_V2 BIT(14)
	#define DAP_NIDEN_DISABLE_V2 BIT(15)
	#define DAP_SPIDEN_DISABLE_V2 BIT(16)
	#define DAP_SPNIDEN_DISABLE_V2 BIT(17)
	#define DAP_DEVICEEN_DISABLE_V2 BIT(18)

	/* CoreSight FUSE V3 */
	#define ALL_DEBUG_DISABLE_V3 BIT(29)
	#define APPS_DBGEN_DISABLE_V3 BIT(8)
	#define APPS_NIDEN_DISABLE_V3 BIT(21)
	#define APPS_SPIDEN_DISABLE_V3 BIT(5)
	#define APPS_SPNIDEN_DISABLE_V3 BIT(31)
	#define DAP_DBGEN_DISABLE_V3 BIT(10)
	#define DAP_NIDEN_DISABLE_V3 BIT(23)
	#define DAP_SPIDEN_DISABLE_V3 BIT(7)
	#define DAP_SPNIDEN_DISABLE_V3 BIT(1)
	#define DAP_DEVICEEN_DISABLE_V3 BIT(7)

	#define QPDI_SPMI_DISABLE BIT(2)
	#define NIDNT_DISABLE BIT(27)

	struct fuse_nidnt {
	void __iomem *base;
	};

	struct fuse_qpdi {
	void __iomem *base;
	};

	struct fuse_drvdata {
	void __iomem *base;
	struct fuse_nidnt *fuse_nidnt;
	struct fuse_qpdi *qpdi;
	struct device *dev;
	struct coresight_device *csdev;
	bool fuse_v2;
	bool fuse_v3;
	};

	static struct fuse_drvdata *fusedrvdata;

	bool coresight_fuse_nidnt_access_disabled(void)
	{
	struct fuse_drvdata *drvdata = fusedrvdata;
	uint32_t nidnt_fuse;
	bool ret;

	if (!drvdata \|\| !drvdata->fuse_nidnt)
	return false;

	nidnt_fuse = fuse_readl(drvdata->fuse_nidnt, 0);

	dev_dbg(drvdata->dev, "nidnt_fuse: %lx\n", (unsigned long)nidnt_fuse);

	if (nidnt_fuse & NIDNT_DISABLE)
	ret = true;
	else
	ret = false;

	if (ret)
	dev_dbg(drvdata->dev, "coresight nidnt fuse disabled\n");

	return ret;
	}
	EXPORT_SYMBOL(coresight_fuse_nidnt_access_disabled);

	bool coresight_fuse_access_disabled(void)
	{
	struct fuse_drvdata *drvdata = fusedrvdata;
	uint32_t config0, config1, config2;
	bool ret = false;

	if (!drvdata)
	return false;

	config0 = fuse_readl(drvdata, OEM_CONFIG0);
	config1 = fuse_readl(drvdata, OEM_CONFIG1);

	dev_dbg(drvdata->dev, "config0: %lx\n", (unsigned long)config0);
	dev_dbg(drvdata->dev, "config1: %lx\n", (unsigned long)config1);

	if (drvdata->fuse_v3) {
	config2 = fuse_readl(drvdata, OEM_CONFIG2);
	dev_dbg(drvdata->dev, "config2: %lx\n", (unsigned long)config2);
	}

	if (drvdata->fuse_v2) {
	if (config1 & ALL_DEBUG_DISABLE_V2)
	ret = true;
	else if (config1 & DAP_DBGEN_DISABLE_V2)
	ret = true;
	else if (config1 & DAP_NIDEN_DISABLE_V2)
	ret = true;
	else if (config1 & DAP_SPIDEN_DISABLE_V2)
	ret = true;
	else if (config1 & DAP_SPNIDEN_DISABLE_V2)
	ret = true;
	else if (config1 & DAP_DEVICEEN_DISABLE_V2)
	ret = true;
	} else if (drvdata->fuse_v3) {
	if (config0 & ALL_DEBUG_DISABLE_V3)
	ret = true;
	else if (config1 & DAP_DBGEN_DISABLE_V3)
	ret = true;
	else if (config1 & DAP_NIDEN_DISABLE_V3)
	ret = true;
	else if (config2 & DAP_SPIDEN_DISABLE_V3)
	ret = true;
	else if (config2 & DAP_SPNIDEN_DISABLE_V3)
	ret = true;
	else if (config1 & DAP_DEVICEEN_DISABLE_V3)
	ret = true;
	} else {
	if (config0 & ALL_DEBUG_DISABLE)
	ret = true;
	else if (config1 & DAP_DBGEN_DISABLE)
	ret = true;
	else if (config1 & DAP_NIDEN_DISABLE)
	ret = true;
	else if (config1 & DAP_SPIDEN_DISABLE)
	ret = true;
	else if (config1 & DAP_SPNIDEN_DISABLE)
	ret = true;
	else if (config1 & DAP_DEVICEEN_DISABLE)
	ret = true;
	}

	if (ret)
	dev_dbg(drvdata->dev, "coresight fuse disabled\n");

	return ret;
	}
	EXPORT_SYMBOL(coresight_fuse_access_disabled);

	bool coresight_fuse_apps_access_disabled(void)
	{
	struct fuse_drvdata *drvdata = fusedrvdata;
	uint32_t config0, config1, config2;
	bool ret = false;

	if (!drvdata)
	return false;

	config0 = fuse_readl(drvdata, OEM_CONFIG0);
	config1 = fuse_readl(drvdata, OEM_CONFIG1);

	dev_dbg(drvdata->dev, "apps config0: %lx\n", (unsigned long)config0);
	dev_dbg(drvdata->dev, "apps config1: %lx\n", (unsigned long)config1);

	if (drvdata->fuse_v3) {
	config2 = fuse_readl(drvdata, OEM_CONFIG2);
	dev_dbg(drvdata->dev, "apps config2: %lx\n",
	(unsigned long)config2);
	}

	if (drvdata->fuse_v2) {
	if (config1 & ALL_DEBUG_DISABLE_V2)
	ret = true;
	else if (config1 & APPS_DBGEN_DISABLE_V2)
	ret = true;
	else if (config1 & APPS_NIDEN_DISABLE_V2)
	ret = true;
	else if (config1 & APPS_SPIDEN_DISABLE_V2)
	ret = true;
	else if (config1 & APPS_SPNIDEN_DISABLE_V2)
	ret = true;
	else if (config1 & DAP_DEVICEEN_DISABLE_V2)
	ret = true;
	} else if (drvdata->fuse_v3) {
	if (config0 & ALL_DEBUG_DISABLE_V3)
	ret = true;
	else if (config1 & APPS_DBGEN_DISABLE_V3)
	ret = true;
	else if (config1 & APPS_NIDEN_DISABLE_V3)
	ret = true;
	else if (config2 & APPS_SPIDEN_DISABLE_V3)
	ret = true;
	else if (config1 & APPS_SPNIDEN_DISABLE_V3)
	ret = true;
	else if (config1 & DAP_DEVICEEN_DISABLE_V3)
	ret = true;
	} else {
	if (config0 & ALL_DEBUG_DISABLE)
	ret = true;
	else if (config1 & APPS_DBGEN_DISABLE)
	ret = true;
	else if (config1 & APPS_NIDEN_DISABLE)
	ret = true;
	else if (config1 & APPS_SPIDEN_DISABLE)
	ret = true;
	else if (config1 & APPS_SPNIDEN_DISABLE)
	ret = true;
	else if (config1 & DAP_DEVICEEN_DISABLE)
	ret = true;
	}

	if (ret)
	dev_dbg(drvdata->dev, "apps fuse disabled\n");

	return ret;
	}
	EXPORT_SYMBOL(coresight_fuse_apps_access_disabled);

	bool coresight_fuse_qpdi_access_disabled(void)
	{
	struct fuse_drvdata *drvdata = fusedrvdata;
	uint32_t config;

	if (!drvdata \|\| !drvdata->qpdi)
	return false;

	config = fuse_readl(drvdata->qpdi, FEATURE_CONFIG2);

	dev_dbg(drvdata->dev, "qpdi config: %lx\n", (unsigned long)config);

	if (config & QPDI_SPMI_DISABLE) {
	dev_dbg(drvdata->dev, "qpdi fuse disabled\n");
	return true;
	} else {
	return false;
	}
	}
	EXPORT_SYMBOL(coresight_fuse_qpdi_access_disabled);

	static struct of_device_id fuse_match[] = {
	{.compatible = CORESIGHT_FUSE_VERSION_V1 },
	{.compatible = CORESIGHT_FUSE_VERSION_V2 },
	{.compatible = CORESIGHT_FUSE_VERSION_V3 },
	{}
	};

	static int fuse_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct coresight_platform_data *pdata;
	struct fuse_drvdata *drvdata;
	struct resource *res;
	struct coresight_desc *desc;
	const struct of_device_id *match;

	if (pdev->dev.of_node) {
	pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
	if (IS_ERR(pdata))
	return PTR_ERR(pdata);
	pdev->dev.platform_data = pdata;
	}

	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
	return -ENOMEM;
	/* Store the driver data pointer for use in exported functions */
	fusedrvdata = drvdata;
	drvdata->dev = &pdev->dev;
	platform_set_drvdata(pdev, drvdata);

	match = of_match_device(fuse_match, dev);
	if (!match)
	return -EINVAL;

	if (!strcmp(match->compatible, CORESIGHT_FUSE_VERSION_V2))
	drvdata->fuse_v2 = true;
	else if (!strcmp(match->compatible, CORESIGHT_FUSE_VERSION_V3))
	drvdata->fuse_v3 = true;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fuse-base");
	if (!res)
	return -ENODEV;

	drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
	if (!drvdata->base)
	return -ENOMEM;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"qpdi-fuse-base");
	if (res) {
	drvdata->qpdi = devm_kzalloc(dev, sizeof(*drvdata->qpdi),
	GFP_KERNEL);
	if (!drvdata->qpdi)
	return -ENOMEM;

	drvdata->qpdi->base = devm_ioremap(dev, res->start,
	resource_size(res));
	if (!drvdata->qpdi->base)
	return -ENOMEM;
	} else {
	dev_info(dev, "QPDI fuse not specified\n");
	}

	res = platform_get_resource_byname(pdev,
	IORESOURCE_MEM,
	"nidnt-fuse-base");
	if (res) {
	drvdata->fuse_nidnt = devm_kzalloc(dev,
	sizeof(*drvdata->fuse_nidnt),
	GFP_KERNEL);
	if (!drvdata->fuse_nidnt)
	return -ENOMEM;

	drvdata->fuse_nidnt->base = devm_ioremap(dev, res->start,
	resource_size(res));
	if (!drvdata->fuse_nidnt->base)
	return -ENOMEM;
	}

	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
	if (!desc)
	return -ENOMEM;
	desc->type = CORESIGHT_DEV_TYPE_NONE;
	desc->pdata = pdev->dev.platform_data;
	desc->dev = &pdev->dev;
	desc->owner = THIS_MODULE;
	drvdata->csdev = coresight_register(desc);
	if (IS_ERR(drvdata->csdev))
	return PTR_ERR(drvdata->csdev);

	dev_info(dev, "Fuse initialized\n");
	return 0;
	}

	static int fuse_remove(struct platform_device *pdev)
	{
	struct fuse_drvdata *drvdata = platform_get_drvdata(pdev);

	coresight_unregister(drvdata->csdev);
	return 0;
	}

	static struct platform_driver fuse_driver = {
	.probe = fuse_probe,
	.remove = fuse_remove,
	.driver = {
	.name = "coresight-fuse",
	.owner = THIS_MODULE,
	.of_match_table = fuse_match,
	},
	};

	static int __init fuse_init(void)
	{
	return platform_driver_register(&fuse_driver);
	}
	module_init(fuse_init);

	static void __exit fuse_exit(void)
	{
	platform_driver_unregister(&fuse_driver);
	}
	module_exit(fuse_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("CoreSight Fuse driver");