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/*
* Copyright (c) 2013, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
/*
* 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
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)
{
/*
* 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
*/
if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
register_trusted_foundations(NULL);
}
static inline bool trusted_foundations_registered(void)
{
return false;
}
#endif /* CONFIG_TRUSTED_FOUNDATIONS */
#endif
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