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
35 struct trusted_foundations_platform_data {
36 unsigned int version_major;
37 unsigned int version_minor;
38 };
39
40 #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
41
42 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
43 void of_register_trusted_foundations(void);
44
45 #else /* CONFIG_TRUSTED_FOUNDATIONS */
46
register_trusted_foundations(struct trusted_foundations_platform_data * pd)47 static 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
of_register_trusted_foundations(void)62 static 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
74
