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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/kconfig.h> | |
30 | #include <linux/printk.h> | |
31 | #include <linux/bug.h> | |
32 | #include <linux/of.h> | |
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33 | #include <linux/cpu.h> |
34 | #include <linux/smp.h> | |
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35 | |
36 | struct trusted_foundations_platform_data { | |
37 | unsigned int version_major; | |
38 | unsigned int version_minor; | |
39 | }; | |
40 | ||
41 | #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS) | |
42 | ||
43 | void register_trusted_foundations(struct trusted_foundations_platform_data *pd); | |
44 | void of_register_trusted_foundations(void); | |
45 | ||
46 | #else /* CONFIG_TRUSTED_FOUNDATIONS */ | |
47 | ||
48 | static inline void register_trusted_foundations( | |
49 | struct trusted_foundations_platform_data *pd) | |
50 | { | |
51 | /* | |
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52 | * If the system requires TF and we cannot provide it, continue booting |
53 | * but disable features that cannot be provided. | |
d9a1beaa | 54 | */ |
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55 | pr_err("No support for Trusted Foundations, continuing in degraded mode.\n"); |
56 | pr_err("Secondary processors as well as CPU PM will be disabled.\n"); | |
3aae97c8 | 57 | #if IS_ENABLED(CONFIG_SMP) |
c3af6d68 | 58 | setup_max_cpus = 0; |
3aae97c8 | 59 | #endif |
c3af6d68 | 60 | cpu_idle_poll_ctrl(true); |
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61 | } |
62 | ||
63 | static inline void of_register_trusted_foundations(void) | |
64 | { | |
65 | /* | |
66 | * If we find the target should enable TF but does not support it, | |
67 | * fail as the system won't be able to do much anyway | |
68 | */ | |
a553b7f5 | 69 | if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations")) |
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70 | register_trusted_foundations(NULL); |
71 | } | |
72 | #endif /* CONFIG_TRUSTED_FOUNDATIONS */ | |
73 | ||
74 | #endif |