Hi Alex,
On 16.8.2016 21:08, Alexander Graf wrote:
> Most armv8 systems have PSCI support enabled in EL3, either through
> ARM Trusted Firmware or other firmware.
>
> On these systems, we do not need to implement system reset manually,
> but can instead rely on higher level firmware to deal with it.
>
> The exclude list seems excessive right now, but NXP is working on
> providing an in-tree PSCI implementation, so that all NXP systems
> can eventually use PSCI as well.
>
> Signed-off-by: Alexander Graf <ag...@suse.de>
> ---
> arch/arm/cpu/armv8/Kconfig | 18 ++++++++++++++++++
> arch/arm/cpu/armv8/fwcall.c | 7 +++++++
> arch/arm/mach-meson/board.c | 5 -----
> board/xilinx/zynqmp/zynqmp.c | 5 -----
> 4 files changed, 25 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm/cpu/armv8/Kconfig b/arch/arm/cpu/armv8/Kconfig
> index 7e1fc4c..cd2d9bb 100644
> --- a/arch/arm/cpu/armv8/Kconfig
> +++ b/arch/arm/cpu/armv8/Kconfig
> @@ -21,4 +21,22 @@ config ARMV8_SPIN_TABLE
> - Reserve the code for the spin-table and the release address
> via a /memreserve/ region in the Device Tree.
>
> +config PSCI_RESET
> + bool "Use PSCI for reset and shutdown"
> + default y
> + depends on !ARCH_EXYNOS7 && !ARCH_BCM283X && !TARGET_LS2080A_EMU && \
> + !TARGET_LS2080A_SIMU && !TARGET_LS2080AQDS && \
> + !TARGET_LS2080ARDB && !TARGET_LS1012AQDS && \
> + !TARGET_LS1012ARDB && !TARGET_LS1012AFRDM && \
> + !TARGET_LS1043ARDB && !ARCH_UNIPHIER && !ARCH_SNAPDRAGON && \
> + !TARGET_S32V234EVB
> + help
> + Most armv8 systems have PSCI support enabled in EL3, either through
> + ARM Trusted Firmware or other firmware.
> +
> + On these systems, we do not need to implement system reset manually,
> + but can instead rely on higher level firmware to deal with it.
> +
> + Select Y here to make use of PSCI calls for system reset
> +
> endif
> diff --git a/arch/arm/cpu/armv8/fwcall.c b/arch/arm/cpu/armv8/fwcall.c
> index b3ef7c0..c57b15f 100644
> --- a/arch/arm/cpu/armv8/fwcall.c
> +++ b/arch/arm/cpu/armv8/fwcall.c
> @@ -112,3 +112,10 @@ void __noreturn psci_system_off(void)
> while (1)
> ;
> }
> +
> +#ifdef CONFIG_PSCI_RESET
> +void reset_misc(void)
> +{
> + psci_system_reset();
maybe we should also consider to check which level we are running at.
if (current_el() != 3) {
...
}
But maybe this should be in checked in smc_call and hvc_call.
Thanks,
Michal
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