1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (c) 2013, NVIDIA Corporation.
7 * Support for the Trusted Foundations secure monitor.
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
17 #ifndef __FIRMWARE_TRUSTED_FOUNDATIONS_H
18 #define __FIRMWARE_TRUSTED_FOUNDATIONS_H
20 #include <linux/printk.h>
21 #include <linux/bug.h>
23 #include <linux/cpu.h>
24 #include <linux/smp.h>
25 #include <linux/types.h>
27 #include <asm/hardware/cache-l2x0.h>
28 #include <asm/outercache.h>
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
36 struct trusted_foundations_platform_data {
37 unsigned int version_major;
38 unsigned int version_minor;
41 #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
43 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
44 void of_register_trusted_foundations(void);
45 bool trusted_foundations_registered(void);
47 #else /* CONFIG_TRUSTED_FOUNDATIONS */
48 static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
52 static inline void register_trusted_foundations(
53 struct trusted_foundations_platform_data *pd)
56 * If the system requires TF and we cannot provide it, continue booting
57 * but disable features that cannot be provided.
59 pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
60 pr_err("Secondary processors as well as CPU PM will be disabled.\n");
61 #if IS_ENABLED(CONFIG_CACHE_L2X0)
62 pr_err("L2X0 cache will be kept disabled.\n");
63 outer_cache.write_sec = tf_dummy_write_sec;
65 #if IS_ENABLED(CONFIG_SMP)
68 cpu_idle_poll_ctrl(true);
71 static inline void of_register_trusted_foundations(void)
74 * If we find the target should enable TF but does not support it,
75 * fail as the system won't be able to do much anyway
77 if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
78 register_trusted_foundations(NULL);
81 static inline bool trusted_foundations_registered(void)
85 #endif /* CONFIG_TRUSTED_FOUNDATIONS */