2 * Copyright (c) 2013, NVIDIA Corporation.
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.
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
16 * Support for the Trusted Foundations secure monitor.
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
26 #ifndef __ASM_ARM_TRUSTED_FOUNDATIONS_H
27 #define __ASM_ARM_TRUSTED_FOUNDATIONS_H
29 #include <linux/printk.h>
30 #include <linux/bug.h>
32 #include <linux/cpu.h>
33 #include <linux/smp.h>
35 #define TF_PM_MODE_LP0 0
36 #define TF_PM_MODE_LP1 1
37 #define TF_PM_MODE_LP1_NO_MC_CLK 2
38 #define TF_PM_MODE_LP2 3
39 #define TF_PM_MODE_LP2_NOFLUSH_L2 4
41 struct trusted_foundations_platform_data {
42 unsigned int version_major;
43 unsigned int version_minor;
46 #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
48 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
49 void of_register_trusted_foundations(void);
51 #else /* CONFIG_TRUSTED_FOUNDATIONS */
53 static inline void register_trusted_foundations(
54 struct trusted_foundations_platform_data *pd)
57 * If the system requires TF and we cannot provide it, continue booting
58 * but disable features that cannot be provided.
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_SMP)
65 cpu_idle_poll_ctrl(true);
68 static inline void of_register_trusted_foundations(void)
71 * If we find the target should enable TF but does not support it,
72 * fail as the system won't be able to do much anyway
74 if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
75 register_trusted_foundations(NULL);
77 #endif /* CONFIG_TRUSTED_FOUNDATIONS */