The Tegra210 AGIC interrupt controller is a 2nd level interrupt controller located in a separate power domain to the main GIC interrupt controller. It can route interrupts to the main CPU cluster or an Audio DSP slave. Ideally we would like to re-use the existing ARM GIC driver because the AGIC is a GIC-400. However, in order to do so this requires a few significant changes to the exisiting GIC driver for power management reasons. The purpose of this RFC-V2 is to get some feedback on the approach and see if we can support the AGIC in this way or if a separate driver is warranted for this device. Please note that this RFC does not address the issue of interrupt routing. Ideally I was thinking that having a mechanism/API to migrate an interrupt from the CPU cluster to the DSP would make sense, however, I don't believe this is supported today in the kernel. Would such an approach be acceptable or if not, is there a better way to handle this? Changes from V1: - Prevent IRQ mapping from setting the IRQ type and only program the type when allocating the IRQ. - Resolved some __init section conflicts found with V1 series. Jon Hunter (8): irqdomain: Ensure type settings match for an existing mapping irqdomain: Don't set type when mapping an IRQ genirq: Add runtime power management support for IRQ chips irqchip/gic: Don't initialise chip if mapping IO space fails irqchip/gic: Return an error if GIC initialisation fails irqchip/gic: Assign irqchip dynamically irqchip/gic: Prepare for adding platform driver irqchip/gic: Add support for tegra AGIC interrupt controller drivers/irqchip/irq-gic-common.c | 4 +- drivers/irqchip/irq-gic.c | 473 ++++++++++++++++++++++++++++----------- include/linux/irq.h | 4 + kernel/irq/internals.h | 24 ++ kernel/irq/irqdomain.c | 76 +++++-- kernel/irq/manage.c | 14 ++ 6 files changed, 447 insertions(+), 148 deletions(-) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
