From 573a3811edc89c2ea3bf4fd077e3673b863b9a0d Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Fri, 14 Apr 2017 11:10:24 +0900 Subject: sysreset: psci: support system reset in a generic way with PSCI 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 --- drivers/sysreset/sysreset_psci.c | 41 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 drivers/sysreset/sysreset_psci.c (limited to 'drivers/sysreset/sysreset_psci.c') diff --git a/drivers/sysreset/sysreset_psci.c b/drivers/sysreset/sysreset_psci.c new file mode 100644 index 00000000000..a4911b7d8ff --- /dev/null +++ b/drivers/sysreset/sysreset_psci.c @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2017 Masahiro Yamada + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include + +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, +}; -- cgit v1.2.3