On Wed, Aug 13, 2014 at 04:00:40PM +0100, suravee.suthikulpanit@xxxxxxx wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
>
> ARM GICv2m specification extends GICv2 to support MSI(-X) with
> a new set of register frame. This patch introduces support for
> the non-secure GICv2m register frame. Currently, GICV2m is available
> in certain version of GIC-400.
>
> The patch introduces a new property in ARM gic binding, the v2m subnode.
> It is optional.
>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> Cc: Mark Rutland <Mark.Rutland@xxxxxxx>
> Cc: Marc Zyngier <Marc.Zyngier@xxxxxxx>
> Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
> Cc: Catalin Marinas <Catalin.Marinas@xxxxxxx>
> Cc: Will Deacon <Will.Deacon@xxxxxxx>
> ---
> Documentation/devicetree/bindings/arm/gic.txt | 32 ++++
> drivers/irqchip/Kconfig | 7 +
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-gic-v2m.c | 215 ++++++++++++++++++++++++++
> drivers/irqchip/irq-gic.c | 75 +++++----
> drivers/irqchip/irq-gic.h | 48 ++++++
> 6 files changed, 348 insertions(+), 30 deletions(-)
> create mode 100644 drivers/irqchip/irq-gic-v2m.c
> create mode 100644 drivers/irqchip/irq-gic.h
>
> diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt
> index 5573c08..8a64179 100644
> --- a/Documentation/devicetree/bindings/arm/gic.txt
> +++ b/Documentation/devicetree/bindings/arm/gic.txt
> @@ -95,3 +95,35 @@ Example:
> <0x2c006000 0x2000>;
> interrupts = <1 9 0xf04>;
> };
> +
> +
> +* GICv2m extension for MSI/MSI-x support (Optional)
> +
> +Certain revision of GIC-400 supports MSI/MSI-x via V2M register frame.
> +This is enabled by specifying v2m sub-node.
> +
> +Required properties:
> +
> +- msi-controller : Identifies the node as an MSI controller.
> +
> +- reg : GICv2m MSI interface register base and size
> +
> +Example:
> +
> + interrupt-controller@e1101000 {
> + compatible = "arm,gic-400";
> + #interrupt-cells = <3>;
> + #address-cells = <2>;
> + #size-cells = <2>;
> + interrupt-controller;
> + interrupts = <1 8 0xf04>;
> + ranges = <0 0 0 0xe1100000 0 0x100000>;
> + reg = <0x0 0xe1110000 0 0x01000>,
> + <0x0 0xe112f000 0 0x02000>,
> + <0x0 0xe1140000 0 0x10000>,
> + <0x0 0xe1160000 0 0x10000>;
> + v2m {
> + msi-controller;
> + reg = <0x0 0x80000 0 0x1000>;
> + };
> + };
[...]
> @@ -1009,6 +1012,16 @@ gic_of_init(struct device_node *node, struct device_node *parent)
> if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
> percpu_offset = 0;
>
> + gic_data[gic_cnt].irq_chip = &gic_chip;
> +
> + /* Currently, we only support one v2m subnode. */
> + child = of_get_child_by_name(node, "v2m");
> + if (child) {
> + ret = gicv2m_of_init(child, &gic_data[gic_cnt]);
> + if (ret)
> + return ret;
> + }
I can't see how you'd sanely expand this to multiple children, which was
the main point of having a separate node for the M block.
Give the M block a compatible string and look for children with that
string.
Thanks,
Mark.
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