Hi Suravee, Apologies for the late reply on this one. I was hoping that Marc would be able to take another look at this, but he's away at present. On Thu, Jul 10, 2014 at 12:05:03AM +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 frames. This patch introduces support for > the non-secure GICv2m register frame. > > The driver currently matchs "arm,gic-400-plus" in device tree binding, > which implements GICv2m. > > The "msi-controller" keyword in ARM GIC devicetree binding is used to indentify > GIC driver that it should enable MSI(-X) support, The region of GICv2m MSI > register frame is specified using the register frame index 4 in the device tree. > MSI support is optional. > > Each GIC maintains an "msi_chip" structure. To discover the msi_chip, > PCI host driver can do the following: > > struct device_node *gic_node = of_irq_find_parent(pdev->dev.of_node); > pcie_bus->msi_chip = of_pci_find_msi_chip_by_node(gic_node); > > 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> > Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> > --- > Documentation/devicetree/bindings/arm/gic.txt | 20 +- > arch/arm64/Kconfig | 1 + > drivers/irqchip/Kconfig | 7 + > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-gic-v2m.c | 251 ++++++++++++++++++++++++++ > drivers/irqchip/irq-gic-v2m.h | 13 ++ > drivers/irqchip/irq-gic.c | 23 ++- > drivers/irqchip/irq-gic.h | 31 +++- > 8 files changed, 334 insertions(+), 13 deletions(-) > create mode 100644 drivers/irqchip/irq-gic-v2m.c > create mode 100644 drivers/irqchip/irq-gic-v2m.h > > diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt > index 5573c08..d2eea0b 100644 > --- a/Documentation/devicetree/bindings/arm/gic.txt > +++ b/Documentation/devicetree/bindings/arm/gic.txt > @@ -12,11 +12,14 @@ Main node required properties: > > - compatible : should be one of: > "arm,gic-400" > + "arm,gic-400-v2m" I'm still not entirely comfortable about this, as I was under the impression that the MSI frame was a block on the side of the GIC rather than being a composite entity with the rest of the GIC. Which means that it would be entirely possible to attach multiple copies of that block, which this binding doesn't cover. > "arm,cortex-a15-gic" > "arm,cortex-a9-gic" > "arm,cortex-a7-gic" > "arm,arm11mp-gic" > + > - interrupt-controller : Identifies the node as an interrupt controller > + > - #interrupt-cells : Specifies the number of cells needed to encode an > interrupt source. The type shall be a <u32> and the value shall be 3. > > @@ -37,9 +40,16 @@ Main node required properties: > the 8 possible cpus attached to the GIC. A bit set to '1' indicated > the interrupt is wired to that CPU. Only valid for PPI interrupts. > > -- reg : Specifies base physical address(s) and size of the GIC registers. The > - first region is the GIC distributor register base and size. The 2nd region is > - the GIC cpu interface register base and size. > +- reg : Specifies base physical address(s) and size of the GIC register frames. > + > + Region | Description > + Index | > + ------------------------------------------------------------------- > + 0 | GIC distributor register base and size > + 1 | GIC cpu interface register base and size > + 2 | VGIC interface control register base and size (Optional) > + 3 | VGIC CPU interface register base and size (Optional) > + 4 | GICv2m MSI interface register base and size (Optional) And describing it as a separate (but related) component would get around the issue of orthogonality with the GICV and GICH registers. Nit: can we use the architected prefixes here please? GICC, GICD, GICH, and GICV respectively for indexes 0-3. Cheers, Mark. -- 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
