mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-02 19:03:20 +09:00
![Masahiro Yamada](/assets/img/avatar_default.png)
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
/*
|
|
* Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <dm/device.h>
|
|
#include <sysreset.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/psci.h>
|
|
|
|
static int psci_sysreset_request(struct udevice *dev, enum sysreset_t type)
|
|
{
|
|
unsigned long function_id;
|
|
|
|
switch (type) {
|
|
case SYSRESET_WARM:
|
|
case SYSRESET_COLD:
|
|
function_id = PSCI_0_2_FN_SYSTEM_RESET;
|
|
break;
|
|
case SYSRESET_POWER:
|
|
function_id = PSCI_0_2_FN_SYSTEM_OFF;
|
|
break;
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
|
|
invoke_psci_fn(function_id, 0, 0, 0);
|
|
|
|
return -EINPROGRESS;
|
|
}
|
|
|
|
static struct sysreset_ops psci_sysreset_ops = {
|
|
.request = psci_sysreset_request,
|
|
};
|
|
|
|
U_BOOT_DRIVER(psci_sysreset) = {
|
|
.name = "psci-sysreset",
|
|
.id = UCLASS_SYSRESET,
|
|
.ops = &psci_sysreset_ops,
|
|
};
|