On 08/14/2014 12:55 PM, Mark Rutland wrote:
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.
Good point. I can try that. Thank, Suravee -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
