Merge tag 'nfs-for-4.9-3' of git://git.linux-nfs.org/projects/anna/linux-nfs
[sfrench/cifs-2.6.git] / arch / arm / include / asm / trusted_foundations.h
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
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
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