arch/arm/include/asm/trusted_foundations.h

   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
  35 struct trusted_foundations_platform_data {
  36         unsigned int version_major;
  37         unsigned int version_minor;
  38 };
  39
  40 #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
  41
  42 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
  43 void of_register_trusted_foundations(void);
  44
  45 #else /* CONFIG_TRUSTED_FOUNDATIONS */
  46
  47 static 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
  62 static 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