treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / include / linux / firmware / trusted_foundations.h
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Copyright (c) 2013, NVIDIA Corporation.
4  */
5
6 /*
7  * Support for the Trusted Foundations secure monitor.
8  *
9  * Trusted Foundation comes active on some ARM consumer devices (most
10  * Tegra-based devices sold on the market are concerned). Such devices can only
11  * perform some basic operations, like setting the CPU reset vector, through
12  * SMC calls to the secure monitor. The calls are completely specific to
13  * Trusted Foundations, and do *not* follow the SMC calling convention or the
14  * PSCI standard.
15  */
16
17 #ifndef __FIRMWARE_TRUSTED_FOUNDATIONS_H
18 #define __FIRMWARE_TRUSTED_FOUNDATIONS_H
19
20 #include <linux/printk.h>
21 #include <linux/bug.h>
22 #include <linux/of.h>
23 #include <linux/cpu.h>
24 #include <linux/smp.h>
25 #include <linux/types.h>
26
27 #include <asm/hardware/cache-l2x0.h>
28 #include <asm/outercache.h>
29
30 #define TF_PM_MODE_LP0                  0
31 #define TF_PM_MODE_LP1                  1
32 #define TF_PM_MODE_LP1_NO_MC_CLK        2
33 #define TF_PM_MODE_LP2                  3
34 #define TF_PM_MODE_LP2_NOFLUSH_L2       4
35
36 struct trusted_foundations_platform_data {
37         unsigned int version_major;
38         unsigned int version_minor;
39 };
40
41 #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
42
43 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
44 void of_register_trusted_foundations(void);
45 bool trusted_foundations_registered(void);
46
47 #else /* CONFIG_TRUSTED_FOUNDATIONS */
48 static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
49 {
50 }
51
52 static inline void register_trusted_foundations(
53                                    struct trusted_foundations_platform_data *pd)
54 {
55         /*
56          * If the system requires TF and we cannot provide it, continue booting
57          * but disable features that cannot be provided.
58          */
59         pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
60         pr_err("Secondary processors as well as CPU PM will be disabled.\n");
61 #if IS_ENABLED(CONFIG_CACHE_L2X0)
62         pr_err("L2X0 cache will be kept disabled.\n");
63         outer_cache.write_sec = tf_dummy_write_sec;
64 #endif
65 #if IS_ENABLED(CONFIG_SMP)
66         setup_max_cpus = 0;
67 #endif
68         cpu_idle_poll_ctrl(true);
69 }
70
71 static inline void of_register_trusted_foundations(void)
72 {
73         /*
74          * If we find the target should enable TF but does not support it,
75          * fail as the system won't be able to do much anyway
76          */
77         if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
78                 register_trusted_foundations(NULL);
79 }
80
81 static inline bool trusted_foundations_registered(void)
82 {
83         return false;
84 }
85 #endif /* CONFIG_TRUSTED_FOUNDATIONS */
86
87 #endif