mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-13 00:03:26 +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>
95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/*
|
|
* Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
|
|
*
|
|
* Based on drivers/firmware/psci.c from Linux:
|
|
* Copyright (C) 2015 ARM Limited
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm/device.h>
|
|
#include <dm/lists.h>
|
|
#include <libfdt.h>
|
|
#include <linux/arm-smccc.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/psci.h>
|
|
|
|
psci_fn *invoke_psci_fn;
|
|
|
|
static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
|
|
unsigned long arg0, unsigned long arg1,
|
|
unsigned long arg2)
|
|
{
|
|
struct arm_smccc_res res;
|
|
|
|
arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
|
|
return res.a0;
|
|
}
|
|
|
|
static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
|
|
unsigned long arg0, unsigned long arg1,
|
|
unsigned long arg2)
|
|
{
|
|
struct arm_smccc_res res;
|
|
|
|
arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
|
|
return res.a0;
|
|
}
|
|
|
|
static int psci_bind(struct udevice *dev)
|
|
{
|
|
/* No SYSTEM_RESET support for PSCI 0.1 */
|
|
if (of_device_is_compatible(dev, "arm,psci-0.2") ||
|
|
of_device_is_compatible(dev, "arm,psci-1.0")) {
|
|
int ret;
|
|
|
|
/* bind psci-sysreset optionally */
|
|
ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset",
|
|
NULL);
|
|
if (ret)
|
|
debug("PSCI System Reset was not bound.\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int psci_probe(struct udevice *dev)
|
|
{
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
const char *method;
|
|
|
|
method = fdt_stringlist_get(gd->fdt_blob, dev->of_offset, "method", 0,
|
|
NULL);
|
|
if (!method) {
|
|
printf("missing \"method\" property\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (!strcmp("hvc", method)) {
|
|
invoke_psci_fn = __invoke_psci_fn_hvc;
|
|
} else if (!strcmp("smc", method)) {
|
|
invoke_psci_fn = __invoke_psci_fn_smc;
|
|
} else {
|
|
printf("invalid \"method\" property: %s\n", method);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id psci_of_match[] = {
|
|
{ .compatible = "arm,psci" },
|
|
{ .compatible = "arm,psci-0.2" },
|
|
{ .compatible = "arm,psci-1.0" },
|
|
{},
|
|
};
|
|
|
|
U_BOOT_DRIVER(psci) = {
|
|
.name = "psci",
|
|
.id = UCLASS_FIRMWARE,
|
|
.of_match = psci_of_match,
|
|
.bind = psci_bind,
|
|
.probe = psci_probe,
|
|
};
|