mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-10 21:26:19 +09:00
573a3811ed
If the system is running PSCI firmware, the System Reset function (func ID: 0x80000009) is supposed to be handled by PSCI, that is, the SoC/board specific reset implementation should be moved to PSCI. U-Boot should call the PSCI service according to the arm-smccc manner. The arm-smccc is supported on ARMv7 or later. Especially, ARMv8 generation SoCs are likely to run ARM Trusted Firmware BL31. In this case, U-Boot is a non-secure world boot loader, so it should not be able to reset the system directly. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
42 lines
800 B
C
42 lines
800 B
C
/*
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* Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <dm/device.h>
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#include <sysreset.h>
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#include <linux/errno.h>
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#include <linux/psci.h>
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static int psci_sysreset_request(struct udevice *dev, enum sysreset_t type)
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{
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unsigned long function_id;
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switch (type) {
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case SYSRESET_WARM:
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case SYSRESET_COLD:
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function_id = PSCI_0_2_FN_SYSTEM_RESET;
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break;
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case SYSRESET_POWER:
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function_id = PSCI_0_2_FN_SYSTEM_OFF;
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break;
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default:
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return -ENOSYS;
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}
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invoke_psci_fn(function_id, 0, 0, 0);
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return -EINPROGRESS;
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}
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static struct sysreset_ops psci_sysreset_ops = {
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.request = psci_sysreset_request,
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};
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U_BOOT_DRIVER(psci_sysreset) = {
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.name = "psci-sysreset",
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.id = UCLASS_SYSRESET,
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.ops = &psci_sysreset_ops,
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};
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