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