b720aaa347
ASUS TF300T device may not work properly if firmware is asked to fully re-initialize L2 cache after resume from LP2 suspend. The downstream kernel of TF300T uses different opcode to enable cache after resuming from LP2, this opcode also works fine on Nexus 7 and Ouya devices. Supposedly, this may be needed by an older firmware versions. Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Tested-by: Jasper Korten <jja2000@gmail.com> Tested-by: David Heidelberg <david@ixit.cz> Tested-by: Peter Geis <pgwipeout@gmail.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2013, NVIDIA Corporation.
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*/
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/*
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* Support for the Trusted Foundations secure monitor.
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*
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* Trusted Foundation comes active on some ARM consumer devices (most
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* Tegra-based devices sold on the market are concerned). Such devices can only
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* perform some basic operations, like setting the CPU reset vector, through
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* SMC calls to the secure monitor. The calls are completely specific to
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* Trusted Foundations, and do *not* follow the SMC calling convention or the
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* PSCI standard.
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*/
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#ifndef __FIRMWARE_TRUSTED_FOUNDATIONS_H
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#define __FIRMWARE_TRUSTED_FOUNDATIONS_H
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#include <linux/printk.h>
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#include <linux/bug.h>
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#include <linux/of.h>
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#include <linux/cpu.h>
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#include <linux/smp.h>
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#include <linux/types.h>
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#include <asm/hardware/cache-l2x0.h>
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#include <asm/outercache.h>
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#define TF_PM_MODE_LP0 0
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#define TF_PM_MODE_LP1 1
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#define TF_PM_MODE_LP1_NO_MC_CLK 2
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#define TF_PM_MODE_LP2 3
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#define TF_PM_MODE_LP2_NOFLUSH_L2 4
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#define TF_PM_MODE_NONE 5
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struct trusted_foundations_platform_data {
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unsigned int version_major;
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unsigned int version_minor;
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};
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#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
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void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
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void of_register_trusted_foundations(void);
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bool trusted_foundations_registered(void);
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#else /* CONFIG_TRUSTED_FOUNDATIONS */
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static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
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{
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}
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static inline void register_trusted_foundations(
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struct trusted_foundations_platform_data *pd)
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{
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/*
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* If the system requires TF and we cannot provide it, continue booting
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* but disable features that cannot be provided.
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*/
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pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
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pr_err("Secondary processors as well as CPU PM will be disabled.\n");
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#if IS_ENABLED(CONFIG_CACHE_L2X0)
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pr_err("L2X0 cache will be kept disabled.\n");
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outer_cache.write_sec = tf_dummy_write_sec;
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#endif
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#if IS_ENABLED(CONFIG_SMP)
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setup_max_cpus = 0;
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#endif
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cpu_idle_poll_ctrl(true);
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}
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static inline void of_register_trusted_foundations(void)
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{
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/*
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* If we find the target should enable TF but does not support it,
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* fail as the system won't be able to do much anyway
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*/
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if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
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register_trusted_foundations(NULL);
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}
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static inline bool trusted_foundations_registered(void)
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{
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return false;
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}
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#endif /* CONFIG_TRUSTED_FOUNDATIONS */
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#endif
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