LXR linux/arch/arm/include/asm/trusted

   1/*
   2 * Copyright (c) 2013, NVIDIA Corporation.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 */
  14
  15/*
  16 * Support for the Trusted Foundations secure monitor.
  17 *
  18 * Trusted Foundation comes active on some ARM consumer devices (most
  19 * Tegra-based devices sold on the market are concerned). Such devices can only
  20 * perform some basic operations, like setting the CPU reset vector, through
  21 * SMC calls to the secure monitor. The calls are completely specific to
  22 * Trusted Foundations, and do *not* follow the SMC calling convention or the
  23 * PSCI standard.
  24 */
  25
  26#ifndef __ASM_ARM_TRUSTED_FOUNDATIONS_H
  27#define __ASM_ARM_TRUSTED_FOUNDATIONS_H
  28
  29#include <linux/printk.h>
  30#include <linux/bug.h>
  31#include <linux/of.h>
  32#include <linux/cpu.h>
  33#include <linux/smp.h>
  34
  35struct trusted_foundations_platform_data {
  36        unsigned int version_major;
  37        unsigned int version_minor;
  38};
  39
  40#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
  41
  42void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
  43void of_register_trusted_foundations(void);
  44
  45#else /* CONFIG_TRUSTED_FOUNDATIONS */
  46
  47static inline void register_trusted_foundations(
  48                                   struct trusted_foundations_platform_data *pd)
  49{
  50        /*
  51         * If the system requires TF and we cannot provide it, continue booting
  52         * but disable features that cannot be provided.
  53         */
  54        pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
  55        pr_err("Secondary processors as well as CPU PM will be disabled.\n");
  56#if IS_ENABLED(CONFIG_SMP)
  57        setup_max_cpus = 0;
  58#endif
  59        cpu_idle_poll_ctrl(true);
  60}
  61
  62static inline void of_register_trusted_foundations(void)
  63{
  64        /*
  65         * If we find the target should enable TF but does not support it,
  66         * fail as the system won't be able to do much anyway
  67         */
  68        if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
  69                register_trusted_foundations(NULL);
  70}
  71#endif /* CONFIG_TRUSTED_FOUNDATIONS */
  72
  73#endif
  74