diff options
| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-04-14 11:10:24 +0900 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2017-04-18 10:29:19 -0400 |
| commit | 573a3811edc89c2ea3bf4fd077e3673b863b9a0d (patch) | |
| tree | 8704ecc42d27c29d7aaef07c2f3942a67d8df476 /drivers/sysreset | |
| parent | c54bcf6805cc6762cb998751b8e005f39ee1dad1 (diff) | |
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 <yamada.masahiro@socionext.com>
Diffstat (limited to 'drivers/sysreset')
| -rw-r--r-- | drivers/sysreset/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/sysreset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/sysreset/sysreset_psci.c | 41 |
3 files changed, 52 insertions, 0 deletions
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig index 05a37b9a14..966463036f 100644 --- a/drivers/sysreset/Kconfig +++ b/drivers/sysreset/Kconfig @@ -13,4 +13,14 @@ config SYSRESET to effect a reset. The uclass will try all available drivers when reset_walk() is called. +if SYSRESET + +config SYSRESET_PSCI + bool "Enable support for PSCI System Reset" + depends on ARM_PSCI_FW + help + Enable PSCI SYSTEM_RESET function call. To use this, PSCI firmware + must be running on your system. + +endif endmenu diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile index 49b8bb61c6..7bb840649f 100644 --- a/drivers/sysreset/Makefile +++ b/drivers/sysreset/Makefile @@ -5,6 +5,7 @@ # obj-$(CONFIG_SYSRESET) += sysreset-uclass.o +obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o ifndef CONFIG_SPL_BUILD obj-$(CONFIG_ROCKCHIP_RK3036) += sysreset_rk3036.o diff --git a/drivers/sysreset/sysreset_psci.c b/drivers/sysreset/sysreset_psci.c new file mode 100644 index 0000000000..a4911b7d8f --- /dev/null +++ b/drivers/sysreset/sysreset_psci.c @@ -0,0 +1,41 @@ +/* + * 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, +}; |