Quelle  trusted_foundations.h   Sprache: C

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (c) 2013, NVIDIA Corporation.
 */

/*
 * Support for the Trusted Foundations secure monitor.
 *
 * Trusted Foundation comes active on some ARM consumer devices (most
 * Tegra-based devices sold on the market are concerned). Such devices can only
 * perform some basic operations, like setting the CPU reset vector, through
 * SMC calls to the secure monitor. The calls are completely specific to
 * Trusted Foundations, and do *not* follow the SMC calling convention or the
 * PSCI standard.
 */

#ifndef __FIRMWARE_TRUSTED_FOUNDATIONS_H
#define __FIRMWARE_TRUSTED_FOUNDATIONS_H

#include <linux/printk.h>
#include <linux/bug.h>
#include <linux/of.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/types.h>

#include <asm/hardware/cache-l2x0.h>
#include <asm/outercache.h>

#define TF_PM_MODE_LP0   0
#define TF_PM_MODE_LP1   1
#define TF_PM_MODE_LP1_NO_MC_CLK 2
#define TF_PM_MODE_LP2   3
#define TF_PM_MODE_LP2_NOFLUSH_L2 4
#define TF_PM_MODE_NONE   5

struct trusted_foundations_platform_data {
 unsigned int version_major;
 unsigned int version_minor;
};

#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)

void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
void of_register_trusted_foundations(void);
bool trusted_foundations_registered(void);

#else /* CONFIG_TRUSTED_FOUNDATIONS */
static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
{
}

static inline void register_trusted_foundations(
       struct trusted_foundations_platform_data *pd)
{
 /*
 * If the system requires TF and we cannot provide it, continue booting
 * but disable features that cannot be provided.
 */
 pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
 pr_err("Secondary processors as well as CPU PM will be disabled.\n");
#if IS_ENABLED(CONFIG_CACHE_L2X0)
 pr_err("L2X0 cache will be kept disabled.\n");
 outer_cache.write_sec = tf_dummy_write_sec;
#endif
#if IS_ENABLED(CONFIG_SMP)
 setup_max_cpus = 0;
#endif
 cpu_idle_poll_ctrl(true);
}

static inline void of_register_trusted_foundations(void)
{
 struct device_node *np = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");

 if (!np)
  return;
 of_node_put(np);
 /*
 * If we find the target should enable TF but does not support it,
 * fail as the system won't be able to do much anyway
 */
 register_trusted_foundations(NULL);
}

static inline bool trusted_foundations_registered(void)
{
 return false;
}
#endif /* CONFIG_TRUSTED_FOUNDATIONS */

#endif