include/linux/firmware/trusted_foundations.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (c) 2013, NVIDIA Corporation.
   4  */
   5
   6 /*
   7  * Support for the Trusted Foundations secure monitor.
   8  *
   9  * Trusted Foundation comes active on some ARM consumer devices (most
  10  * Tegra-based devices sold on the market are concerned). Such devices can only
  11  * perform some basic operations, like setting the CPU reset vector, through
  12  * SMC calls to the secure monitor. The calls are completely specific to
  13  * Trusted Foundations, and do *not* follow the SMC calling convention or the
  14  * PSCI standard.
  15  */
  16
  17 #ifndef __FIRMWARE_TRUSTED_FOUNDATIONS_H
  18 #define __FIRMWARE_TRUSTED_FOUNDATIONS_H
  19
  20 #include <linux/printk.h>
  21 #include <linux/bug.h>
  22 #include <linux/of.h>
  23 #include <linux/cpu.h>
  24 #include <linux/smp.h>
  25 #include <linux/types.h>
  26
  27 #include <asm/hardware/cache-l2x0.h>
  28 #include <asm/outercache.h>
  29
  30 #define TF_PM_MODE_LP0                  0
  31 #define TF_PM_MODE_LP1                  1
  32 #define TF_PM_MODE_LP1_NO_MC_CLK        2
  33 #define TF_PM_MODE_LP2                  3
  34 #define TF_PM_MODE_LP2_NOFLUSH_L2       4
  35 #define TF_PM_MODE_NONE                 5
  36
  37 struct trusted_foundations_platform_data {
  38         unsigned int version_major;
  39         unsigned int version_minor;
  40 };
  41
  42 #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
  43
  44 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
  45 void of_register_trusted_foundations(void);
  46 bool trusted_foundations_registered(void);
  47
  48 #else /* CONFIG_TRUSTED_FOUNDATIONS */
  49 static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
  50 {
  51 }
  52
  53 static inline void register_trusted_foundations(
  54                                    struct trusted_foundations_platform_data *pd)
  55 {
  56         /*
  57          * If the system requires TF and we cannot provide it, continue booting
  58          * but disable features that cannot be provided.
  59          */
  60         pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
  61         pr_err("Secondary processors as well as CPU PM will be disabled.\n");
  62 #if IS_ENABLED(CONFIG_CACHE_L2X0)
  63         pr_err("L2X0 cache will be kept disabled.\n");
  64         outer_cache.write_sec = tf_dummy_write_sec;
  65 #endif
  66 #if IS_ENABLED(CONFIG_SMP)
  67         setup_max_cpus = 0;
  68 #endif
  69         cpu_idle_poll_ctrl(true);
  70 }
  71
  72 static inline void of_register_trusted_foundations(void)
  73 {
  74         /*
  75          * If we find the target should enable TF but does not support it,
  76          * fail as the system won't be able to do much anyway
  77          */
  78         if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
  79                 register_trusted_foundations(NULL);
  80 }
  81
  82 static inline bool trusted_foundations_registered(void)
  83 {
  84         return false;
  85 }
  86 #endif /* CONFIG_TRUSTED_FOUNDATIONS */
  87
  88 #endif