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>
33#include <linux/cpu.h>
34#include <linux/smp.h>
35
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	/*
52	 * If the system requires TF and we cannot provide it, continue booting
53	 * but disable features that cannot be provided.
54	 */
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");
57#if IS_ENABLED(CONFIG_SMP)
58	setup_max_cpus = 0;
59#endif
60	cpu_idle_poll_ctrl(true);
61}
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	 */
69	if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
70		register_trusted_foundations(NULL);
71}
72#endif /* CONFIG_TRUSTED_FOUNDATIONS */
73
74#endif
75