Some socs have a large number of interrupts requests to service
the needs of its many peripherals and subsystems. All of the interrupt
requests lines from the subsystems are not needed at the same
time, so they have to be muxed to the controllers appropriately.
In such places a interrupt controllers are preceded by an
IRQ CROSSBAR that provides flexibility in muxing the device interrupt
requests to the controller inputs.
This series models the peripheral interrupts that can be routed through
the crossbar to the GIC as 'routable-irqs'. The routable irqs are added
in a separate linear domain inside the GIC. The registered routable domain's
callback are invoked as a part of the GIC's callback, which in turn should
allocate a free irq line and configure the IP accordingly. So every peripheral
in the dts files mentions the fixed crossbar number as its interrupt. A free
gic line for that gets allocated and configured when the peripheral interrupts
are mapped.
The minimal crossbar driver to track and allocate free GIC lines and configure
the
crossbar is added here, along with the DT bindings.
V3:
Addressed few more comments from Thomas Gleixner <t...@linutronix.de>
Rebased patches 3,4,5,7 which updates the DTS file on top of below branch
git://git.kernel.org/pub/scm/linux/kernel/git/bcousson/linux-omap-dt.git
for_3.13/dts
Rebased patches 1,2,6 on top of 3.12 mainline
Updated Commit tags
V2:
Addressed Thomas Gleixner <t...@linutronix.de> comments and
Kumar Gala <ga...@codeaurora.org>
Split updating the DRA7.dtsi file for adding the routable-irqs
Previous discussions that led to this is at
https://lkml.org/lkml/2013/9/18/540
The V1,V2 post of these patches is at
[V1] https://lkml.org/lkml/2013/9/30/283
[V2] http://www.spinics.net/lists/linux-omap/msg99540.html
Sricharan R (7):
DRIVERS: IRQCHIP: IRQ-GIC: Add support for routable irqs
DRIVERS: IRQCHIP: CROSSBAR: Add support for Crossbar IP
ARM: DTS: DRA: Add crossbar device binding
ARM: DTS: DRA: Replace peripheral interrupt numbers with crossbar
inputs
ARM: DTS: DRA7: Add routable-irqs property for gic node
ARM: OMAP4+: Correct Wakeup-gen code to use physical irq number
ARM: DRA: Enable Crossbar IP support for DRA7XX
Documentation/devicetree/bindings/arm/gic.txt | 6 +
.../devicetree/bindings/arm/omap/crossbar.txt | 27 +++
arch/arm/boot/dts/dra7.dtsi | 95 +++++----
arch/arm/mach-omap2/Kconfig | 1 +
arch/arm/mach-omap2/omap-wakeupgen.c | 4 +-
arch/arm/mach-omap2/omap4-common.c | 4 +
drivers/irqchip/Kconfig | 8 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-crossbar.c | 206 ++++++++++++++++++++
drivers/irqchip/irq-gic.c | 81 +++++++-
include/linux/irqchip/arm-gic.h | 8 +-
include/linux/irqchip/irq-crossbar.h | 11 ++
12 files changed, 396 insertions(+), 56 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arm/omap/crossbar.txt
create mode 100644 drivers/irqchip/irq-crossbar.c
create mode 100644 include/linux/irqchip/irq-crossbar.h
--
1.7.9.5
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