c3af6d6855
When Trusted Foundations is detected as present on the system, but Trusted Foundations support is not built into the kernel, the kernel used to issue a panic very early during boot, leaving little clue to the user as to what is going wrong. It turns out that even without TF support built-in, the kernel can boot on a TF-enabled system provided that SMP and cpuidle are disabled. This patch does this and continue booting on one CPU, leaving the user with a usable (however degraded) system. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Stephen Warren <swarren@nvidia.com>
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/*
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* Copyright (c) 2013, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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/*
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* Support for the Trusted Foundations secure monitor.
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*
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* Trusted Foundation comes active on some ARM consumer devices (most
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* Tegra-based devices sold on the market are concerned). Such devices can only
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* perform some basic operations, like setting the CPU reset vector, through
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* SMC calls to the secure monitor. The calls are completely specific to
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* Trusted Foundations, and do *not* follow the SMC calling convention or the
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* PSCI standard.
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*/
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#ifndef __ASM_ARM_TRUSTED_FOUNDATIONS_H
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#define __ASM_ARM_TRUSTED_FOUNDATIONS_H
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#include <linux/kconfig.h>
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#include <linux/printk.h>
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#include <linux/bug.h>
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#include <linux/of.h>
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#include <linux/cpu.h>
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#include <linux/smp.h>
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struct trusted_foundations_platform_data {
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unsigned int version_major;
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unsigned int version_minor;
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};
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#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
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void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
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void of_register_trusted_foundations(void);
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#else /* CONFIG_TRUSTED_FOUNDATIONS */
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static inline void register_trusted_foundations(
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struct trusted_foundations_platform_data *pd)
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{
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/*
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* If the system requires TF and we cannot provide it, continue booting
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* but disable features that cannot be provided.
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*/
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pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
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pr_err("Secondary processors as well as CPU PM will be disabled.\n");
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setup_max_cpus = 0;
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cpu_idle_poll_ctrl(true);
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}
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static inline void of_register_trusted_foundations(void)
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{
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/*
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* If we find the target should enable TF but does not support it,
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* fail as the system won't be able to do much anyway
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*/
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if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
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register_trusted_foundations(NULL);
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}
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#endif /* CONFIG_TRUSTED_FOUNDATIONS */
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#endif
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