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#define TF_PM_MODE_NONE 5
36
37struct trusted_foundations_platform_data {
38 unsigned int version_major;
39 unsigned int version_minor;
40};
41
42#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
43
44void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
45void of_register_trusted_foundations(void);
46bool trusted_foundations_registered(void);
47
48#else /* CONFIG_TRUSTED_FOUNDATIONS */
49static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
50{
51}
52
53static inline void register_trusted_foundations(
54 struct trusted_foundations_platform_data *pd)
55{
56 /*
57 * If the system requires TF and we cannot provide it, continue booting
58 * but disable features that cannot be provided.
59 */
60 pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
61 pr_err("Secondary processors as well as CPU PM will be disabled.\n");
62#if IS_ENABLED(CONFIG_CACHE_L2X0)
63 pr_err("L2X0 cache will be kept disabled.\n");
64 outer_cache.write_sec = tf_dummy_write_sec;
65#endif
66#if IS_ENABLED(CONFIG_SMP)
67 setup_max_cpus = 0;
68#endif
69 cpu_idle_poll_ctrl(enable: true);
70}
71
72static inline void of_register_trusted_foundations(void)
73{
74 struct device_node *np = of_find_compatible_node(NULL, NULL, compat: "tlm,trusted-foundations");
75
76 if (!np)
77 return;
78 of_node_put(node: np);
79 /*
80 * If we find the target should enable TF but does not support it,
81 * fail as the system won't be able to do much anyway
82 */
83 register_trusted_foundations(NULL);
84}
85
86static inline bool trusted_foundations_registered(void)
87{
88 return false;
89}
90#endif /* CONFIG_TRUSTED_FOUNDATIONS */
91
92#endif
93

source code of linux/include/linux/firmware/trusted_foundations.h