include/linux/firmware/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 __FIRMWARE_TRUSTED_FOUNDATIONS_H
  27 #define __FIRMWARE_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 #include <linux/types.h>
  35
  36 #include <asm/hardware/cache-l2x0.h>
  37 #include <asm/outercache.h>
  38
  39 #define TF_PM_MODE_LP0                  0
  40 #define TF_PM_MODE_LP1                  1
  41 #define TF_PM_MODE_LP1_NO_MC_CLK        2
  42 #define TF_PM_MODE_LP2                  3
  43 #define TF_PM_MODE_LP2_NOFLUSH_L2       4
  44
  45 struct trusted_foundations_platform_data {
  46         unsigned int version_major;
  47         unsigned int version_minor;
  48 };
  49
  50 #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
  51
  52 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
  53 void of_register_trusted_foundations(void);
  54 bool trusted_foundations_registered(void);
  55
  56 #else /* CONFIG_TRUSTED_FOUNDATIONS */
  57 static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
  58 {
  59 }
  60
  61 static inline void register_trusted_foundations(
  62                                    struct trusted_foundations_platform_data *pd)
  63 {
  64         /*
  65          * If the system requires TF and we cannot provide it, continue booting
  66          * but disable features that cannot be provided.
  67          */
  68         pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
  69         pr_err("Secondary processors as well as CPU PM will be disabled.\n");
  70 #if IS_ENABLED(CONFIG_CACHE_L2X0)
  71         pr_err("L2X0 cache will be kept disabled.\n");
  72         outer_cache.write_sec = tf_dummy_write_sec;
  73 #endif
  74 #if IS_ENABLED(CONFIG_SMP)
  75         setup_max_cpus = 0;
  76 #endif
  77         cpu_idle_poll_ctrl(true);
  78 }
  79
  80 static inline void of_register_trusted_foundations(void)
  81 {
  82         /*
  83          * If we find the target should enable TF but does not support it,
  84          * fail as the system won't be able to do much anyway
  85          */
  86         if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
  87                 register_trusted_foundations(NULL);
  88 }
  89
  90 static inline bool trusted_foundations_registered(void)
  91 {
  92         return false;
  93 }
  94 #endif /* CONFIG_TRUSTED_FOUNDATIONS */
  95
  96 #endif