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Alexandre Courbotd9a1bea2013-11-24 15:30:46 +09001/*
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>
Alexandre Courbotc3af6d62014-02-07 13:35:02 +090033#include <linux/cpu.h>
34#include <linux/smp.h>
Alexandre Courbotd9a1bea2013-11-24 15:30:46 +090035
36struct trusted_foundations_platform_data {
37 unsigned int version_major;
38 unsigned int version_minor;
39};
40
41#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
42
43void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
44void of_register_trusted_foundations(void);
45
46#else /* CONFIG_TRUSTED_FOUNDATIONS */
47
48static inline void register_trusted_foundations(
49 struct trusted_foundations_platform_data *pd)
50{
51 /*
Alexandre Courbotc3af6d62014-02-07 13:35:02 +090052 * If the system requires TF and we cannot provide it, continue booting
53 * but disable features that cannot be provided.
Alexandre Courbotd9a1bea2013-11-24 15:30:46 +090054 */
Alexandre Courbotc3af6d62014-02-07 13:35:02 +090055 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");
Alexandre Courbot3aae97c2014-05-23 09:23:32 +090057#if IS_ENABLED(CONFIG_SMP)
Alexandre Courbotc3af6d62014-02-07 13:35:02 +090058 setup_max_cpus = 0;
Alexandre Courbot3aae97c2014-05-23 09:23:32 +090059#endif
Alexandre Courbotc3af6d62014-02-07 13:35:02 +090060 cpu_idle_poll_ctrl(true);
Alexandre Courbotd9a1bea2013-11-24 15:30:46 +090061}
62
63static 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 */
Alexandre Courbota553b7f2014-02-07 13:35:01 +090069 if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
Alexandre Courbotd9a1bea2013-11-24 15:30:46 +090070 register_trusted_foundations(NULL);
71}
72#endif /* CONFIG_TRUSTED_FOUNDATIONS */
73
74#endif