Dear Marek,
On 19. 8. 28. 오후 9:10, Marek Szyprowski wrote:
> All CortexA7/A15 based Exynos5 SoCs have ARM architected timers, so enable
> support for them directly in the base dtsi. None of the known firmware
> properly configures CNTFRQ arch timer register, so force clock frequency
> to 24MHz, which is the only configuration supported by the remaining
> clock drivers so far.
>
> Stock firmware for Peach Pit and Pi Chromebooks also doesn't reset
> properly other arch timer registers, so add respective properties
> indicating that. Other Exynos5-based boards behaves correctly in this area,
> what finally allows to enable support for KVM-based virtualization.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> ---
> arch/arm/boot/dts/exynos5420-peach-pit.dts | 4 ++++
> arch/arm/boot/dts/exynos54xx.dtsi | 9 +++++++++
> arch/arm/boot/dts/exynos5800-peach-pi.dts | 4 ++++
> 3 files changed, 17 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> index f78db6809cca..77e08a4c7300 100644
> --- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
> +++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> @@ -1064,6 +1064,10 @@
> status = "okay";
> };
>
> +&timer {
> + arm,cpu-registers-not-fw-configured;
> +};
> +
> &tmu_cpu0 {
> vtmu-supply = <&ldo10_reg>;
> };
> diff --git a/arch/arm/boot/dts/exynos54xx.dtsi b/arch/arm/boot/dts/exynos54xx.dtsi
> index 9c3b63b7cac6..02d34957cd83 100644
> --- a/arch/arm/boot/dts/exynos54xx.dtsi
> +++ b/arch/arm/boot/dts/exynos54xx.dtsi
> @@ -45,6 +45,15 @@
> status = "disabled";
> };
>
> + timer: timer {
> + compatible = "arm,armv7-timer";
> + interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> + <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> + <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> + <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> + clock-frequency = <24000000>;
> + };
> +
> soc: soc {
> sysram@2020000 {
> compatible = "mmio-sram";
> diff --git a/arch/arm/boot/dts/exynos5800-peach-pi.dts b/arch/arm/boot/dts/exynos5800-peach-pi.dts
> index e0f470fe54c8..5e8cec736444 100644
> --- a/arch/arm/boot/dts/exynos5800-peach-pi.dts
> +++ b/arch/arm/boot/dts/exynos5800-peach-pi.dts
> @@ -1033,6 +1033,10 @@
> status = "okay";
> };
>
> +&timer {
> + arm,cpu-registers-not-fw-configured;
> +};
> +
> &tmu_cpu0 {
> vtmu-supply = <&ldo10_reg>;
> };
>
I tested it on odroid-xu3 to enable arch-timer for KVM.
In result, I could just initialize KVM on xu3 without problem.
Tested-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Reviewed-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
--
Best Regards,
Chanwoo Choi
Samsung Electronics
