linux-kernel - Re: [PATCH v9 20/37] arm: gic-v3-its: Implement of

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Message-ID: <CAFyOScrfp10DiXeOQ8VXafFAdqwf7VNAtngktOC753=o0n1fog@mail.gmail.com>
Date: Wed, 16 Oct 2024 13:09:10 -0700
From: Moritz Fischer <moritzf@...gle.com>
To: Patrick Rudolph <patrick.rudolph@...ements.com>
Cc: u-boot@...ts.denx.de, linux-kernel@...r.kernel.org, 
	Tom Rini <trini@...sulko.com>
Subject: Re: [PATCH v9 20/37] arm: gic-v3-its: Implement of_xlate

On Tue, Oct 15, 2024 at 11:15 PM Patrick Rudolph
<patrick.rudolph@...ements.com> wrote:
>
> Translate IRQs by implementing of_xlate() as required by
> irq_get_by_index() to parse interrupt properties.
>
> Map DT interrupts to ARM GIC interrupts as follows:
>
> - Interrupt numbers ID32-ID1019 are used for SPIs
> - ID0-ID15 are used for SGIs
> - ID16-ID31 are used for PPIs
>
> TEST: Booted on qemu sbsa-ref that has a GICV3.
>
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>

Reviewed-by: Moritz Fischer <moritzf@...gle.com>
> ---
> Changelog v9:
> - Require at least 3 interrupt-cells
> - Map SPI interrupts to ID32+
> - Map PPI interrupts to ID16+
> ---
>  arch/arm/lib/gic-v3-its.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/arch/arm/lib/gic-v3-its.c b/arch/arm/lib/gic-v3-its.c
> index 22fa46a341..58f8bf864f 100644
> --- a/arch/arm/lib/gic-v3-its.c
> +++ b/arch/arm/lib/gic-v3-its.c
> @@ -4,9 +4,11 @@
>   */
>  #include <cpu_func.h>
>  #include <dm.h>
> +#include <irq.h>
>  #include <asm/gic.h>
>  #include <asm/gic-v3.h>
>  #include <asm/io.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <linux/bitops.h>
>  #include <linux/printk.h>
>  #include <linux/sizes.h>
> @@ -163,8 +165,30 @@ static const struct udevice_id gic_v3_ids[] = {
>         {}
>  };
>
> +static int arm_gic_v3_of_xlate(struct irq *irq, struct ofnode_phandle_args *args)
> +{
> +       if (args->args_count < 3) {
> +               log_debug("Invalid args_count: %d\n", args->args_count);
> +               return -EINVAL;
> +       }
> +
> +       if (args->args[0] == GIC_SPI)
> +               irq->id = args->args[1] + 32;
> +       else
> +               irq->id = args->args[1] + 16;
> +
> +       irq->flags = args->args[2];
> +
> +       return 0;
> +}
> +
> +static const struct irq_ops arm_gic_v3_ops = {
> +       .of_xlate               =  arm_gic_v3_of_xlate,
> +};
> +
>  U_BOOT_DRIVER(arm_gic_v3) = {
>         .name           = "gic-v3",
>         .id             = UCLASS_IRQ,
>         .of_match       = gic_v3_ids,
> +       .ops            = &arm_gic_v3_ops,
>  };
> --
> 2.46.2
>