drivers/soc/qcom/spss_utils.c - kernel/msm - Git at Google

 /*
  * Copyright (c) 2016-2017, 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.
  */

 /*
  * Secure-Processor-SubSystem (SPSS) utilities.
  *
  * This driver provides utilities for the Secure Processor (SP).
  *
  * The SP daemon needs to load different SPSS images based on:
  *
  * 1. Test/Production key used to sign the SPSS image (read fuses).
  * 2. SPSS HW version (selected via Device Tree).
  *
  */

 #define pr_fmt(fmt)	"spss_utils [%s]: " fmt, __func__

 #include <linux/kernel.h>   /* min() */
 #include <linux/module.h>   /* MODULE_LICENSE */
 #include <linux/device.h>   /* class_create() */
 #include <linux/slab.h>     /* kzalloc() */
 #include <linux/fs.h>       /* file_operations */
 #include <linux/cdev.h>     /* cdev_add() */
 #include <linux/errno.h>    /* EINVAL, ETIMEDOUT */
 #include <linux/printk.h>   /* pr_err() */
 #include <linux/bitops.h>   /* BIT(x) */
 #include <linux/platform_device.h> /* platform_driver_register() */
 #include <linux/of.h>       /* of_property_count_strings() */
 #include <linux/io.h>       /* ioremap_nocache() */

 #include <soc/qcom/subsystem_restart.h>

 /* driver name */
 #define DEVICE_NAME	"spss-utils"

 enum spss_firmware_type {
 	SPSS_FW_TYPE_DEV = 'd',
 	SPSS_FW_TYPE_TEST = 't',
 	SPSS_FW_TYPE_PROD = 'p',
 };

 static enum spss_firmware_type firmware_type = SPSS_FW_TYPE_TEST;
 static const char *dev_firmware_name;
 static const char *test_firmware_name;
 static const char *prod_firmware_name;
 static const char *firmware_name = "NA";
 static struct device *spss_dev;
 static u32 spss_debug_reg_addr; /* SP_SCSR_MBn_SP2CL_GPm(n,m) */

 /*==========================================================================*/
 /*		Device Sysfs */
 /*==========================================================================*/

 static ssize_t firmware_name_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	int ret;

 	if (!dev || !attr || !buf) {
 		pr_err("invalid param.\n");
 		return -EINVAL;
 	}

 	if (firmware_name == NULL)
 		ret = snprintf(buf, PAGE_SIZE, "%s\n", "unknown");
 	else
 		ret = snprintf(buf, PAGE_SIZE, "%s\n", firmware_name);

 	return ret;
 }

 static ssize_t firmware_name_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t size)
 {
 	pr_err("set firmware name is not allowed.\n");

 	return -EINVAL;
 }

 static DEVICE_ATTR(firmware_name, 0444,
 		firmware_name_show, firmware_name_store);

 static ssize_t test_fuse_state_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	int ret;

 	if (!dev || !attr || !buf) {
 		pr_err("invalid param.\n");
 		return -EINVAL;
 	}

 	switch (firmware_type) {
 	case SPSS_FW_TYPE_DEV:
 		ret = snprintf(buf, PAGE_SIZE, "%s", "dev");
 		break;
 	case SPSS_FW_TYPE_TEST:
 		ret = snprintf(buf, PAGE_SIZE, "%s", "test");
 		break;
 	case SPSS_FW_TYPE_PROD:
 		ret = snprintf(buf, PAGE_SIZE, "%s", "prod");
 		break;
 	default:
 		return -EINVAL;
 	}

 	return ret;
 }

 static ssize_t test_fuse_state_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t size)
 {
 	pr_err("set test fuse state is not allowed.\n");

 	return -EINVAL;
 }

 static DEVICE_ATTR(test_fuse_state, 0444,
 		test_fuse_state_show, test_fuse_state_store);

 static ssize_t spss_debug_reg_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	int ret;
 	void __iomem *spss_debug_reg = NULL;
 	u32 val1, val2;

 	if (!dev || !attr || !buf) {
 		pr_err("invalid param.\n");
 		return -EINVAL;
 	}

 	pr_debug("spss_debug_reg_addr [0x%x].\n", spss_debug_reg_addr);

 	spss_debug_reg = ioremap_nocache(spss_debug_reg_addr, sizeof(u32)*2);

 	if (!spss_debug_reg) {
 		pr_err("can't map debug reg addr.\n");
 		return -EFAULT;
 	}

 	val1 = readl_relaxed(spss_debug_reg);
 	val2 = readl_relaxed(((char *) spss_debug_reg) + sizeof(u32));

 	ret = snprintf(buf, PAGE_SIZE, "val1 [0x%x] val2 [0x%x]", val1, val2);

 	iounmap(spss_debug_reg);

 	return ret;
 }

 static ssize_t spss_debug_reg_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t size)
 {
 	pr_err("set debug reg is not allowed.\n");

 	return -EINVAL;
 }

 static DEVICE_ATTR(spss_debug_reg, 0444,
 		spss_debug_reg_show, spss_debug_reg_store);

 static int spss_create_sysfs(struct device *dev)
 {
 	int ret;

 	ret = device_create_file(dev, &dev_attr_firmware_name);
 	if (ret < 0) {
 		pr_err("failed to create sysfs file for firmware_name.\n");
 		return ret;
 	}

 	ret = device_create_file(dev, &dev_attr_test_fuse_state);
 	if (ret < 0) {
 		pr_err("failed to create sysfs file for test_fuse_state.\n");
 		device_remove_file(dev, &dev_attr_firmware_name);
 		return ret;
 	}

 	ret = device_create_file(dev, &dev_attr_spss_debug_reg);
 	if (ret < 0) {
 		pr_err("failed to create sysfs file for spss_debug_reg.\n");
 		device_remove_file(dev, &dev_attr_firmware_name);
 		device_remove_file(dev, &dev_attr_test_fuse_state);
 		return ret;
 	}

 	return 0;
 }

 /*==========================================================================*/
 /*		Device Tree */
 /*==========================================================================*/

 /**
  * spss_parse_dt() - Parse Device Tree info.
  */
 static int spss_parse_dt(struct device_node *node)
 {
 	int ret;
 	u32 spss_fuse1_addr = 0;
 	u32 spss_fuse1_bit = 0;
 	u32 spss_fuse1_mask = 0;
 	void __iomem *spss_fuse1_reg = NULL;
 	u32 spss_fuse2_addr = 0;
 	u32 spss_fuse2_bit = 0;
 	u32 spss_fuse2_mask = 0;
 	void __iomem *spss_fuse2_reg = NULL;
 	u32 val1 = 0;
 	u32 val2 = 0;

 	ret = of_property_read_string(node, "qcom,spss-dev-firmware-name",
 		&dev_firmware_name);
 	if (ret < 0) {
 		pr_err("can't get dev fw name.\n");
 		return -EFAULT;
 	}

 	ret = of_property_read_string(node, "qcom,spss-test-firmware-name",
 		&test_firmware_name);
 	if (ret < 0) {
 		pr_err("can't get test fw name.\n");
 		return -EFAULT;
 	}

 	ret = of_property_read_string(node, "qcom,spss-prod-firmware-name",
 		&prod_firmware_name);
 	if (ret < 0) {
 		pr_err("can't get prod fw name.\n");
 		return -EFAULT;
 	}

 	ret = of_property_read_u32(node, "qcom,spss-fuse1-addr",
 		&spss_fuse1_addr);
 	if (ret < 0) {
 		pr_err("can't get fuse1 addr.\n");
 		return -EFAULT;
 	}

 	ret = of_property_read_u32(node, "qcom,spss-fuse2-addr",
 		&spss_fuse2_addr);
 	if (ret < 0) {
 		pr_err("can't get fuse2 addr.\n");
 		return -EFAULT;
 	}

 	ret = of_property_read_u32(node, "qcom,spss-fuse1-bit",
 		&spss_fuse1_bit);
 	if (ret < 0) {
 		pr_err("can't get fuse1 bit.\n");
 		return -EFAULT;
 	}

 	ret = of_property_read_u32(node, "qcom,spss-fuse2-bit",
 		&spss_fuse2_bit);
 	if (ret < 0) {
 		pr_err("can't get fuse2 bit.\n");
 		return -EFAULT;
 	}


 	spss_fuse1_mask = BIT(spss_fuse1_bit);
 	spss_fuse2_mask = BIT(spss_fuse2_bit);

 	pr_debug("spss fuse1 addr [0x%x] bit [%d] .\n",
 		(int) spss_fuse1_addr, (int) spss_fuse1_bit);
 	pr_debug("spss fuse2 addr [0x%x] bit [%d] .\n",
 		(int) spss_fuse2_addr, (int) spss_fuse2_bit);

 	spss_fuse1_reg = ioremap_nocache(spss_fuse1_addr, sizeof(u32));

 	if (!spss_fuse1_reg) {
 		pr_err("can't map fuse1 addr.\n");
 		return -EFAULT;
 	}

 	spss_fuse2_reg = ioremap_nocache(spss_fuse2_addr, sizeof(u32));

 	if (!spss_fuse2_reg) {
 		iounmap(spss_fuse1_reg);
 		pr_err("can't map fuse2 addr.\n");
 		return -EFAULT;
 	}

 	val1 = readl_relaxed(spss_fuse1_reg);
 	val2 = readl_relaxed(spss_fuse2_reg);

 	pr_debug("spss fuse1 value [0x%08x].\n", (int) val1);
 	pr_debug("spss fuse2 value [0x%08x].\n", (int) val2);

 	pr_debug("spss fuse1 mask [0x%08x].\n", (int) spss_fuse1_mask);
 	pr_debug("spss fuse2 mask [0x%08x].\n", (int) spss_fuse2_mask);

 	/**
 	 * Set firmware_type based on fuses:
 	 *	SPSS_CONFIG_MODE 11:        dev
 	 *	SPSS_CONFIG_MODE 01 or 10:  test
 	 *	SPSS_CONFIG_MODE 00:        prod
 	 */
 	if ((val1 & spss_fuse1_mask) && (val2 & spss_fuse2_mask))
 		firmware_type = SPSS_FW_TYPE_DEV;
 	else if ((val1 & spss_fuse1_mask) || (val2 & spss_fuse2_mask))
 		firmware_type = SPSS_FW_TYPE_TEST;
 	else
 		firmware_type = SPSS_FW_TYPE_PROD;

 	iounmap(spss_fuse1_reg);
 	iounmap(spss_fuse2_reg);

 	ret = of_property_read_u32(node, "qcom,spss-debug-reg-addr",
 		&spss_debug_reg_addr);
 	if (ret < 0) {
 		pr_err("can't get debug regs addr.\n");
 		return ret;
 	}

 	return 0;
 }

 /**
  * spss_probe() - initialization sequence
  */
 static int spss_probe(struct platform_device *pdev)
 {
 	int ret = 0;
 	struct device_node *np = NULL;
 	struct device *dev = NULL;

 	if (!pdev) {
 		pr_err("invalid pdev.\n");
 		return -ENODEV;
 	}

 	np = pdev->dev.of_node;
 	if (!np) {
 		pr_err("invalid DT node.\n");
 		return -EINVAL;
 	}

 	dev = &pdev->dev;
 	spss_dev = dev;

 	if (dev == NULL) {
 		pr_err("invalid dev.\n");
 		return -EINVAL;
 	}

 	platform_set_drvdata(pdev, dev);

 	ret = spss_parse_dt(np);
 	if (ret < 0) {
 		pr_err("fail to parse device tree.\n");
 		return -EFAULT;
 	}

 	switch (firmware_type) {
 	case SPSS_FW_TYPE_DEV:
 		firmware_name = dev_firmware_name;
 		break;
 	case SPSS_FW_TYPE_TEST:
 		firmware_name = test_firmware_name;
 		break;
 	case SPSS_FW_TYPE_PROD:
 		firmware_name = prod_firmware_name;
 		break;
 	default:
 		return -EINVAL;
 	}

 	ret = subsystem_set_fwname("spss", firmware_name);
 	if (ret < 0) {
 		pr_err("fail to set fw name.\n");
 		return -EFAULT;
 	}

 	ret = spss_create_sysfs(dev);
 	if (ret < 0) {
 		pr_err("fail to create sysfs.\n");
 		return -EFAULT;
 	}

 	pr_info("Initialization completed ok, firmware_name [%s].\n",
 		firmware_name);

 	return 0;
 }

 static const struct of_device_id spss_match_table[] = {
 	{ .compatible = "qcom,spss-utils", },
 	{ },
 };

 static struct platform_driver spss_driver = {
 	.probe = spss_probe,
 	.driver = {
 		.name = DEVICE_NAME,
 		.owner = THIS_MODULE,
 		.of_match_table = of_match_ptr(spss_match_table),
 	},
 };

 /*==========================================================================*/
 /*		Driver Init/Exit					*/
 /*==========================================================================*/
 static int __init spss_init(void)
 {
 	int ret = 0;

 	pr_info("spss-utils driver Ver 2.0 30-Mar-2017.\n");

 	ret = platform_driver_register(&spss_driver);
 	if (ret)
 		pr_err("register platform driver failed, ret [%d]\n", ret);

 	return ret;
 }
 late_initcall(spss_init); /* start after PIL driver */

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Secure Processor Utilities");
	/*
	* Copyright (c) 2016-2017, 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.
	*/

	/*
	* Secure-Processor-SubSystem (SPSS) utilities.
	*
	* This driver provides utilities for the Secure Processor (SP).
	*
	* The SP daemon needs to load different SPSS images based on:
	*
	* 1. Test/Production key used to sign the SPSS image (read fuses).
	* 2. SPSS HW version (selected via Device Tree).
	*
	*/

	#define pr_fmt(fmt) "spss_utils [%s]: " fmt, __func__

	#include <linux/kernel.h> /* min() */
	#include <linux/module.h> /* MODULE_LICENSE */
	#include <linux/device.h> /* class_create() */
	#include <linux/slab.h> /* kzalloc() */
	#include <linux/fs.h> /* file_operations */
	#include <linux/cdev.h> /* cdev_add() */
	#include <linux/errno.h> /* EINVAL, ETIMEDOUT */
	#include <linux/printk.h> /* pr_err() */
	#include <linux/bitops.h> /* BIT(x) */
	#include <linux/platform_device.h> /* platform_driver_register() */
	#include <linux/of.h> /* of_property_count_strings() */
	#include <linux/io.h> /* ioremap_nocache() */

	#include <soc/qcom/subsystem_restart.h>

	/* driver name */
	#define DEVICE_NAME "spss-utils"

	enum spss_firmware_type {
	SPSS_FW_TYPE_DEV = 'd',
	SPSS_FW_TYPE_TEST = 't',
	SPSS_FW_TYPE_PROD = 'p',
	};

	static enum spss_firmware_type firmware_type = SPSS_FW_TYPE_TEST;
	static const char *dev_firmware_name;
	static const char *test_firmware_name;
	static const char *prod_firmware_name;
	static const char *firmware_name = "NA";
	static struct device *spss_dev;
	static u32 spss_debug_reg_addr; /* SP_SCSR_MBn_SP2CL_GPm(n,m) */

	/==========================================================================/
	/* Device Sysfs */
	/==========================================================================/

	static ssize_t firmware_name_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	int ret;

	if (!dev \|\| !attr \|\| !buf) {
	pr_err("invalid param.\n");
	return -EINVAL;
	}

	if (firmware_name == NULL)
	ret = snprintf(buf, PAGE_SIZE, "%s\n", "unknown");
	else
	ret = snprintf(buf, PAGE_SIZE, "%s\n", firmware_name);

	return ret;
	}

	static ssize_t firmware_name_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t size)
	{
	pr_err("set firmware name is not allowed.\n");

	return -EINVAL;
	}

	static DEVICE_ATTR(firmware_name, 0444,
	firmware_name_show, firmware_name_store);

	static ssize_t test_fuse_state_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	int ret;

	if (!dev \|\| !attr \|\| !buf) {
	pr_err("invalid param.\n");
	return -EINVAL;
	}

	switch (firmware_type) {
	case SPSS_FW_TYPE_DEV:
	ret = snprintf(buf, PAGE_SIZE, "%s", "dev");
	break;
	case SPSS_FW_TYPE_TEST:
	ret = snprintf(buf, PAGE_SIZE, "%s", "test");
	break;
	case SPSS_FW_TYPE_PROD:
	ret = snprintf(buf, PAGE_SIZE, "%s", "prod");
	break;
	default:
	return -EINVAL;
	}

	return ret;
	}

	static ssize_t test_fuse_state_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t size)
	{
	pr_err("set test fuse state is not allowed.\n");

	return -EINVAL;
	}

	static DEVICE_ATTR(test_fuse_state, 0444,
	test_fuse_state_show, test_fuse_state_store);

	static ssize_t spss_debug_reg_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	int ret;
	void __iomem *spss_debug_reg = NULL;
	u32 val1, val2;

	if (!dev \|\| !attr \|\| !buf) {
	pr_err("invalid param.\n");
	return -EINVAL;
	}

	pr_debug("spss_debug_reg_addr [0x%x].\n", spss_debug_reg_addr);

	spss_debug_reg = ioremap_nocache(spss_debug_reg_addr, sizeof(u32)*2);

	if (!spss_debug_reg) {
	pr_err("can't map debug reg addr.\n");
	return -EFAULT;
	}

	val1 = readl_relaxed(spss_debug_reg);
	val2 = readl_relaxed(((char *) spss_debug_reg) + sizeof(u32));

	ret = snprintf(buf, PAGE_SIZE, "val1 [0x%x] val2 [0x%x]", val1, val2);

	iounmap(spss_debug_reg);

	return ret;
	}

	static ssize_t spss_debug_reg_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t size)
	{
	pr_err("set debug reg is not allowed.\n");

	return -EINVAL;
	}

	static DEVICE_ATTR(spss_debug_reg, 0444,
	spss_debug_reg_show, spss_debug_reg_store);

	static int spss_create_sysfs(struct device *dev)
	{
	int ret;

	ret = device_create_file(dev, &dev_attr_firmware_name);
	if (ret < 0) {
	pr_err("failed to create sysfs file for firmware_name.\n");
	return ret;
	}

	ret = device_create_file(dev, &dev_attr_test_fuse_state);
	if (ret < 0) {
	pr_err("failed to create sysfs file for test_fuse_state.\n");
	device_remove_file(dev, &dev_attr_firmware_name);
	return ret;
	}

	ret = device_create_file(dev, &dev_attr_spss_debug_reg);
	if (ret < 0) {
	pr_err("failed to create sysfs file for spss_debug_reg.\n");
	device_remove_file(dev, &dev_attr_firmware_name);
	device_remove_file(dev, &dev_attr_test_fuse_state);
	return ret;
	}

	return 0;
	}

	/==========================================================================/
	/* Device Tree */
	/==========================================================================/

	/**
	* spss_parse_dt() - Parse Device Tree info.
	*/
	static int spss_parse_dt(struct device_node *node)
	{
	int ret;
	u32 spss_fuse1_addr = 0;
	u32 spss_fuse1_bit = 0;
	u32 spss_fuse1_mask = 0;
	void __iomem *spss_fuse1_reg = NULL;
	u32 spss_fuse2_addr = 0;
	u32 spss_fuse2_bit = 0;
	u32 spss_fuse2_mask = 0;
	void __iomem *spss_fuse2_reg = NULL;
	u32 val1 = 0;
	u32 val2 = 0;

	ret = of_property_read_string(node, "qcom,spss-dev-firmware-name",
	&dev_firmware_name);
	if (ret < 0) {
	pr_err("can't get dev fw name.\n");
	return -EFAULT;
	}

	ret = of_property_read_string(node, "qcom,spss-test-firmware-name",
	&test_firmware_name);
	if (ret < 0) {
	pr_err("can't get test fw name.\n");
	return -EFAULT;
	}

	ret = of_property_read_string(node, "qcom,spss-prod-firmware-name",
	&prod_firmware_name);
	if (ret < 0) {
	pr_err("can't get prod fw name.\n");
	return -EFAULT;
	}

	ret = of_property_read_u32(node, "qcom,spss-fuse1-addr",
	&spss_fuse1_addr);
	if (ret < 0) {
	pr_err("can't get fuse1 addr.\n");
	return -EFAULT;
	}

	ret = of_property_read_u32(node, "qcom,spss-fuse2-addr",
	&spss_fuse2_addr);
	if (ret < 0) {
	pr_err("can't get fuse2 addr.\n");
	return -EFAULT;
	}

	ret = of_property_read_u32(node, "qcom,spss-fuse1-bit",
	&spss_fuse1_bit);
	if (ret < 0) {
	pr_err("can't get fuse1 bit.\n");
	return -EFAULT;
	}

	ret = of_property_read_u32(node, "qcom,spss-fuse2-bit",
	&spss_fuse2_bit);
	if (ret < 0) {
	pr_err("can't get fuse2 bit.\n");
	return -EFAULT;
	}


	spss_fuse1_mask = BIT(spss_fuse1_bit);
	spss_fuse2_mask = BIT(spss_fuse2_bit);

	pr_debug("spss fuse1 addr [0x%x] bit [%d] .\n",
	(int) spss_fuse1_addr, (int) spss_fuse1_bit);
	pr_debug("spss fuse2 addr [0x%x] bit [%d] .\n",
	(int) spss_fuse2_addr, (int) spss_fuse2_bit);

	spss_fuse1_reg = ioremap_nocache(spss_fuse1_addr, sizeof(u32));

	if (!spss_fuse1_reg) {
	pr_err("can't map fuse1 addr.\n");
	return -EFAULT;
	}

	spss_fuse2_reg = ioremap_nocache(spss_fuse2_addr, sizeof(u32));

	if (!spss_fuse2_reg) {
	iounmap(spss_fuse1_reg);
	pr_err("can't map fuse2 addr.\n");
	return -EFAULT;
	}

	val1 = readl_relaxed(spss_fuse1_reg);
	val2 = readl_relaxed(spss_fuse2_reg);

	pr_debug("spss fuse1 value [0x%08x].\n", (int) val1);
	pr_debug("spss fuse2 value [0x%08x].\n", (int) val2);

	pr_debug("spss fuse1 mask [0x%08x].\n", (int) spss_fuse1_mask);
	pr_debug("spss fuse2 mask [0x%08x].\n", (int) spss_fuse2_mask);

	/**
	* Set firmware_type based on fuses:
	* SPSS_CONFIG_MODE 11: dev
	* SPSS_CONFIG_MODE 01 or 10: test
	* SPSS_CONFIG_MODE 00: prod
	*/
	if ((val1 & spss_fuse1_mask) && (val2 & spss_fuse2_mask))
	firmware_type = SPSS_FW_TYPE_DEV;
	else if ((val1 & spss_fuse1_mask) \|\| (val2 & spss_fuse2_mask))
	firmware_type = SPSS_FW_TYPE_TEST;
	else
	firmware_type = SPSS_FW_TYPE_PROD;

	iounmap(spss_fuse1_reg);
	iounmap(spss_fuse2_reg);

	ret = of_property_read_u32(node, "qcom,spss-debug-reg-addr",
	&spss_debug_reg_addr);
	if (ret < 0) {
	pr_err("can't get debug regs addr.\n");
	return ret;
	}

	return 0;
	}

	/**
	* spss_probe() - initialization sequence
	*/
	static int spss_probe(struct platform_device *pdev)
	{
	int ret = 0;
	struct device_node *np = NULL;
	struct device *dev = NULL;

	if (!pdev) {
	pr_err("invalid pdev.\n");
	return -ENODEV;
	}

	np = pdev->dev.of_node;
	if (!np) {
	pr_err("invalid DT node.\n");
	return -EINVAL;
	}

	dev = &pdev->dev;
	spss_dev = dev;

	if (dev == NULL) {
	pr_err("invalid dev.\n");
	return -EINVAL;
	}

	platform_set_drvdata(pdev, dev);

	ret = spss_parse_dt(np);
	if (ret < 0) {
	pr_err("fail to parse device tree.\n");
	return -EFAULT;
	}

	switch (firmware_type) {
	case SPSS_FW_TYPE_DEV:
	firmware_name = dev_firmware_name;
	break;
	case SPSS_FW_TYPE_TEST:
	firmware_name = test_firmware_name;
	break;
	case SPSS_FW_TYPE_PROD:
	firmware_name = prod_firmware_name;
	break;
	default:
	return -EINVAL;
	}

	ret = subsystem_set_fwname("spss", firmware_name);
	if (ret < 0) {
	pr_err("fail to set fw name.\n");
	return -EFAULT;
	}

	ret = spss_create_sysfs(dev);
	if (ret < 0) {
	pr_err("fail to create sysfs.\n");
	return -EFAULT;
	}

	pr_info("Initialization completed ok, firmware_name [%s].\n",
	firmware_name);

	return 0;
	}

	static const struct of_device_id spss_match_table[] = {
	{ .compatible = "qcom,spss-utils", },
	{ },
	};

	static struct platform_driver spss_driver = {
	.probe = spss_probe,
	.driver = {
	.name = DEVICE_NAME,
	.owner = THIS_MODULE,
	.of_match_table = of_match_ptr(spss_match_table),
	},
	};

	/==========================================================================/
	/* Driver Init/Exit */
	/==========================================================================/
	static int __init spss_init(void)
	{
	int ret = 0;

	pr_info("spss-utils driver Ver 2.0 30-Mar-2017.\n");

	ret = platform_driver_register(&spss_driver);
	if (ret)
	pr_err("register platform driver failed, ret [%d]\n", ret);

	return ret;
	}
	late_initcall(spss_init); /* start after PIL driver */

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("Secure Processor Utilities");