[RFC PATCH v2 8/9] lib: utils/irqchip: Add wrapper for T-HEAD PLIC delegation

[Anup Patel]

On Mon, May 30, 2022 at 9:07 AM Samuel Holland <samuel at sholland.org> wrote:
>
> The delegation bit is lost along with the rest of the PLIC state when
> the CPU power domain in the Allwinner D1 is powered down, so the PLIC
> needs to be re-delegated to S-mode during the hart resume path.
>
> Signed-off-by: Samuel Holland <samuel at sholland.org>
> ---

Looks good to me.

Reviewed-by: Anup Patel <anup at brainfault.org>

Regards,
Anup

>
> Changes in v2:
>  - New patch for v2
>
>  include/sbi_utils/irqchip/fdt_irqchip_plic.h | 2 ++
>  lib/utils/irqchip/fdt_irqchip_plic.c         | 7 +++++++
>  2 files changed, 9 insertions(+)
>
> diff --git a/include/sbi_utils/irqchip/fdt_irqchip_plic.h b/include/sbi_utils/irqchip/fdt_irqchip_plic.h
> index 66650a2..d1ab5bd 100644
> --- a/include/sbi_utils/irqchip/fdt_irqchip_plic.h
> +++ b/include/sbi_utils/irqchip/fdt_irqchip_plic.h
> @@ -17,4 +17,6 @@ void irqchip_plic_context_save(u32 *enable, u32 *threshold);
>
>  void irqchip_plic_context_restore(const u32 *enable, u32 threshold);
>
> +void thead_plic_restore(void);
> +
>  #endif
> diff --git a/lib/utils/irqchip/fdt_irqchip_plic.c b/lib/utils/irqchip/fdt_irqchip_plic.c
> index 37090d3..5589863 100644
> --- a/lib/utils/irqchip/fdt_irqchip_plic.c
> +++ b/lib/utils/irqchip/fdt_irqchip_plic.c
> @@ -151,6 +151,13 @@ static void thead_plic_plat_init(struct plic_data *pd)
>         writel_relaxed(BIT(0), (char *)pd->addr + THEAD_PLIC_CTRL_REG);
>  }
>
> +void thead_plic_restore(void)
> +{
> +       struct plic_data *plic = plic_hartid2data[current_hartid()];
> +
> +       thead_plic_plat_init(plic);
> +}
> +
>  static const struct fdt_match irqchip_plic_match[] = {
>         { .compatible = "riscv,plic0" },
>         { .compatible = "sifive,plic-1.0.0" },
> --
> 2.35.1
>
>
> --
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