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Commit 92bfac8f authored by Reut Zysman's avatar Reut Zysman
Browse files

soc: qcom: add secure processor subsystem (spss) utils driver 



The spss-util driver provides utilities required for the SPSS.
It provides the fuse state for key selection.
It provides the SPSS HW version.

Change-Id: Ie10809884abeaa4f31a6da1368cc7d986c9297e9
Signed-off-by: default avatarReut Zysman <rzysman@codeaurora.org>
parent d78ef3b5

Documentation/devicetree/bindings/arm/msm/spss_utils.txt

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+35 −0
Original line number Diff line number Diff line 
Qualcomm Technologies, Inc. Secure Processor SubSystem Utilities (spss_utils)



The Secure Processor SubSystem (SPSS) is a dedicated subsystem for security.

It has its own CPU, memories, and cryptographic engine.

It shall provide cryptographic services to other subsystems.

The SPSS firmware is loaded by PIL driver.

The communication with SPSS is done via spcom driver, using glink.



The spss_utils driver selects the SPSS firmware file,

according to a dedicated fuse and the platform HW version.



Required properties:

-compatible : should be "qcom,spss_utils"

-qcom,spss-fuse1-addr: fuse1 register physical address

-qcom,spss-fuse1-bit: fuse1 relevant bit

-qcom,spss-fuse2-addr: fuse2 register physical address

-qcom,spss-fuse2-bit: fuse2 relevant bit

-qcom,spss-dev-firmware-name: dev firmware file name

-qcom,spss-test-firmware-name: test firmware file name

-qcom,spss-prod-firmware-name: production firmware file name

-qcom,spss-debug-reg-addr: debug register physical address



Example:

   qcom,spss_utils {

      compatible = "qcom,spss-utils";



      qcom,spss-fuse1-addr = <0x007841c4>;

      qcom,spss-fuse1-bit = <27>;

      qcom,spss-fuse2-addr = <0x007841c4>;

      qcom,spss-fuse2-bit = <26>;

      qcom,spss-dev-firmware-name  = "spss1d";  /* 8 chars max */

      qcom,spss-test-firmware-name = "spss1t";  /* 8 chars max */

      qcom,spss-prod-firmware-name = "spss1p";  /* 8 chars max */

      qcom,spss-debug-reg-addr = <0x01886020>;

   };

drivers/soc/qcom/Kconfig

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@@ -324,6 +324,17 @@ config MSM_SPCOM 
	  spcom provides clients/server API, although currently only one client

	  or server is allowed per logical channel.



config MSM_SPSS_UTILS

	depends on MSM_PIL

	bool "Secure Processor Utilities"

	help

	  spss-utils driver selects Secure Processor firmware file name.

	  The firmware file name for dev, test or production is selected

	  based on two fuses.

	  Different file name is used for differnt SPSS HW versions,

	  because the SPSS firmware size is too small to support multiple

	  HW versions.



config TRACER_PKT

	bool "Tracer Packet"

	help

drivers/soc/qcom/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ obj-$(CONFIG_MSM_GLINK_LOOPBACK_SERVER) += glink_loopback_server.o 
obj-$(CONFIG_MSM_GLINK_SMEM_NATIVE_XPRT) += glink_smem_native_xprt.o

obj-$(CONFIG_MSM_GLINK_SPI_XPRT) += glink_spi_xprt.o

obj-$(CONFIG_MSM_SPCOM) += spcom.o

obj-$(CONFIG_MSM_SPSS_UTILS) += spss_utils.o

obj-$(CONFIG_TRACER_PKT) += tracer_pkt.o

obj-$(CONFIG_QCOM_BUS_SCALING) += msm_bus/

obj-$(CONFIG_QTI_RPMH_API) += rpmh.o

drivers/soc/qcom/spss_utils.c

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/*

 * 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");