[v8,1/5] ARM: add basic support for Trusted Foundations

Message ID	1381527938-22840-2-git-send-email-acourbot@nvidia.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org> From: Alexandre Courbot <acourbot@nvidia.com> To: Stephen Warren <swarren@wwwdotorg.org> Subject: [PATCH v8 1/5] ARM: add basic support for Trusted Foundations Date: Fri, 11 Oct 2013 14:45:34 -0700 Message-ID: <1381527938-22840-2-git-send-email-acourbot@nvidia.com> In-Reply-To: <1381527938-22840-1-git-send-email-acourbot@nvidia.com> References: <1381527938-22840-1-git-send-email-acourbot@nvidia.com> MIME-Version: 1.0 Cc: Mark Rutland <Mark.Rutland@arm.com>, devicetree@vger.kernel.org, Kevin Hilman <khilman@linaro.org>, Russell King <linux@arm.linux.org.uk>, Pawel Moll <pawel.moll@arm.com>, Arnd Bergmann <arnd@arndb.de>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Tomasz Figa <t.figa@samsung.com>, linux-kernel@vger.kernel.org, Rob Herring <rob.herring@calxeda.com>, linux-tegra@vger.kernel.org, Alexandre Courbot <acourbot@nvidia.com>, Olof Johansson <olof@lixom.net>, Dave Martin <Dave.Martin@arm.com>, linux-arm-kernel@lists.infradead.org Precedence: list Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org> Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org

diff --git a/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundations.txt b/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundations.txt new file mode 100644 index 0000000..2ec75c9 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundations.txt @@ -0,0 +1,20 @@ +Trusted Foundations +------------------- + +Boards that use the Trusted Foundations secure monitor can signal its +presence by declaring a node compatible with "tl,trusted-foundations" +under the /firmware/ node + +Required properties: +- compatible : "tl,trusted-foundations" +- version-major : major version number of Trusted Foundations firmware +- version-minor: minor version number of Trusted Foundations firmware + +Example: + firmware { + trusted-foundations { + compatible = "tl,trusted-foundations"; + version-major = <2>; + version-minor = <8>; + }; + }; diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt index 2956800..a374eaa 100644 --- a/Documentation/devicetree/bindings/vendor-prefixes.txt +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt @@ -66,6 +66,7 @@ ste ST-Ericsson stericsson ST-Ericsson toumaz Toumaz ti Texas Instruments +tl Trusted Logic toshiba Toshiba Corporation v3 V3 Semiconductor via VIA Technologies, Inc. diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 1ad6fb6..bf14cec 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1076,6 +1076,8 @@ config ARM_TIMER_SP804 select CLKSRC_MMIO select CLKSRC_OF if OF +source "arch/arm/firmware/Kconfig" + source arch/arm/mm/Kconfig config ARM_NR_BANKS diff --git a/arch/arm/Makefile b/arch/arm/Makefile index a37a50f..f26712c 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -268,6 +268,7 @@ core-$(CONFIG_KVM_ARM_HOST) += arch/arm/kvm/ core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/ core-y += arch/arm/net/ core-y += arch/arm/crypto/ +core-y += arch/arm/firmware/ core-y += $(machdirs) $(platdirs) drivers-$(CONFIG_OPROFILE) += arch/arm/oprofile/ diff --git a/arch/arm/firmware/Kconfig b/arch/arm/firmware/Kconfig new file mode 100644 index 0000000..bb00ccf --- /dev/null +++ b/arch/arm/firmware/Kconfig @@ -0,0 +1,28 @@ +config ARCH_SUPPORTS_FIRMWARE + bool + +config ARCH_SUPPORTS_TRUSTED_FOUNDATIONS + bool + select ARCH_SUPPORTS_FIRMWARE + +menu "Firmware options" + depends on ARCH_SUPPORTS_FIRMWARE + +config TRUSTED_FOUNDATIONS + bool "Trusted Foundations secure monitor support" + depends on ARCH_SUPPORTS_TRUSTED_FOUNDATIONS + help + Some devices (including most Tegra-based consumer devices on the + market) are booted with the Trusted Foundations secure monitor + active, requiring some core operations to be performed by the secure + monitor instead of the kernel. + + This option allows the kernel to invoke the secure monitor whenever + required on devices using Trusted Foundations. See + arch/arm/include/asm/trusted_foundations.h or the + tl,trusted-foundations device tree binding documentation for details + on how to use it. + + Say n if you don't know what this is about. + +endmenu diff --git a/arch/arm/firmware/Makefile b/arch/arm/firmware/Makefile new file mode 100644 index 0000000..a71f165 --- /dev/null +++ b/arch/arm/firmware/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_TRUSTED_FOUNDATIONS) += trusted_foundations.o diff --git a/arch/arm/firmware/trusted_foundations.c b/arch/arm/firmware/trusted_foundations.c new file mode 100644 index 0000000..fe063d5 --- /dev/null +++ b/arch/arm/firmware/trusted_foundations.c @@ -0,0 +1,79 @@ +/* + * Trusted Foundations support for ARM CPUs + * + * Copyright (c) 2013, NVIDIA Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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/init.h> +#include <linux/of.h> +#include <asm/firmware.h> +#include <asm/trusted_foundations.h> + +#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200 + +static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2) +{ + asm volatile( + ".arch_extension sec\n\t" + "stmfd sp!, {r4 - r11, lr}\n\t" + __asmeq("%0", "r0") + __asmeq("%1", "r1") + __asmeq("%2", "r2") + "mov r3, #0\n\t" + "mov r4, #0\n\t" + "smc #0\n\t" + "ldmfd sp!, {r4 - r11, pc}" + : + : "r" (type), "r" (arg1), "r" (arg2) + : "memory"); +} + +static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr) +{ + tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, boot_addr, 0); + + return 0; +} + +static const struct firmware_ops trusted_foundations_ops = { + .set_cpu_boot_addr = tf_set_cpu_boot_addr, +}; + +void register_trusted_foundations(struct trusted_foundations_platform_data *pd) +{ + /* + * we are not using version information for now since currently + * supported SMCs are compatible with all TF releases + */ + register_firmware_ops(&trusted_foundations_ops); +} + +void of_register_trusted_foundations(void) +{ + struct device_node *node; + struct trusted_foundations_platform_data pdata; + int err; + + node = of_find_compatible_node(NULL, NULL, "tl,trusted-foundations"); + if (!node) + return; + + err = of_property_read_u32(node, "version-major", &pdata.version_major); + if (err != 0) + panic("Trusted Foundation: missing version-major property\n"); + err = of_property_read_u32(node, "version-minor", &pdata.version_minor); + if (err != 0) + panic("Trusted Foundation: missing version-minor property\n"); + register_trusted_foundations(&pdata); +} diff --git a/arch/arm/include/asm/trusted_foundations.h b/arch/arm/include/asm/trusted_foundations.h new file mode 100644 index 0000000..c6f20bd --- /dev/null +++ b/arch/arm/include/asm/trusted_foundations.h @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2013, NVIDIA Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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. + */ + +/* + * Support for the Trusted Foundations secure monitor. + * + * Trusted Foundation comes active on some ARM consumer devices (most + * Tegra-based devices sold on the market are concerned). Such devices can only + * perform some basic operations, like setting the CPU reset vector, through + * SMC calls to the secure monitor. The calls are completely specific to + * Trusted Foundations, and do *not* follow the SMC calling convention or the + * PSCI standard. + */ + +#ifndef __ASM_ARM_TRUSTED_FOUNDATIONS_H +#define __ASM_ARM_TRUSTED_FOUNDATIONS_H + +#include <linux/kconfig.h> + +struct trusted_foundations_platform_data { + unsigned int version_major; + unsigned int version_minor; +}; + +#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS) + +void register_trusted_foundations(struct trusted_foundations_platform_data *pd); +void of_register_trusted_foundations(void); + +#else /* CONFIG_TRUSTED_FOUNDATIONS */ + +#include <linux/printk.h> +#include <linux/of.h> +#include <asm/bug.h> + +static inline void register_trusted_foundations( + struct trusted_foundations_platform_data *pd) +{ + /* + * If we try to register TF, this means the system needs it to continue. + * Its absence if thus a fatal error. + */ + panic("No support for Trusted Foundations, stopping...\n"); +} + +static inline void of_register_trusted_foundations(void) +{ + /* + * If we find the target should enable TF but does not support it, + * fail as the system won't be able to do much anyway + */ + if (of_find_compatible_node(NULL, NULL, "tl,trusted-foundations")) + register_trusted_foundations(NULL); +} +#endif /* CONFIG_TRUSTED_FOUNDATIONS */ + +#endif

[v8,1/5] ARM: add basic support for Trusted Foundations

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