Commit 5698c50d authored by James Hogan's avatar James Hogan
Browse files

metag: Internal and external irqchips 



Meta core internal interrupts (from HWSTATMETA and friends) are vectored
onto the TR1 core trigger for the current thread. This is demultiplexed
in irq-metag.c to individual Linux IRQs for each internal interrupt.

External SoC interrupts (from HWSTATEXT and friends) are vectored onto
the TR2 core trigger for the current thread. This is demultiplexed in
irq-metag-ext.c to individual Linux IRQs for each external SoC interrupt.
The external irqchip has devicetree bindings for configuring the number
of irq banks and the type of masking available.

Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: Dom Cobley <popcornmix@gmail.com>
Cc: Simon Arlott <simon@fire.lp0.eu>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-doc@vger.kernel.org
parent 63047ea3

Documentation/devicetree/bindings/metag/meta-intc.txt

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* Meta External Trigger Controller Binding



This binding specifies what properties must be available in the device tree

representation of a Meta external trigger controller.



Required properties:



    - compatible: Specifies the compatibility list for the interrupt controller.

      The type shall be <string> and the value shall include "img,meta-intc".



    - num-banks: Specifies the number of interrupt banks (each of which can

      handle 32 interrupt sources).



    - interrupt-controller: The presence of this property identifies the node

      as an interupt controller. No property value shall be defined.



    - #interrupt-cells: Specifies the number of cells needed to encode an

      interrupt source. The type shall be a <u32> and the value shall be 2.



    - #address-cells: Specifies the number of cells needed to encode an

      address. The type shall be <u32> and the value shall be 0. As such,

      'interrupt-map' nodes do not have to specify a parent unit address.



Optional properties:



    - no-mask: The controller doesn't have any mask registers.



* Interrupt Specifier Definition



  Interrupt specifiers consists of 2 cells encoded as follows:



    - <1st-cell>: The interrupt-number that identifies the interrupt source.



    - <2nd-cell>: The Linux interrupt flags containing level-sense information,

                  encoded as follows:

                    1 = edge triggered

                    4 = level-sensitive



* Examples



Example 1:



	/*

	 * Meta external trigger block

	 */

	intc: intc {

		// This is an interrupt controller node.

		interrupt-controller;



		// No address cells so that 'interrupt-map' nodes which

		// reference this interrupt controller node do not need a parent

		// address specifier.

		#address-cells = <0>;



		// Two cells to encode interrupt sources.

		#interrupt-cells = <2>;



		// Number of interrupt banks

		num-banks = <2>;



		// No HWMASKEXT is available (specify on Chorus2 and Comet ES1)

		no-mask;



		// Compatible with Meta hardware trigger block.

		compatible = "img,meta-intc";

	};



Example 2:



	/*

	 * An interrupt generating device that is wired to a Meta external

	 * trigger block.

	 */

	uart1: uart@0x02004c00 {

		// Interrupt source '5' that is level-sensitive.

		// Note that there are only two cells as specified in the

		// interrupt parent's '#interrupt-cells' property.

		interrupts = <5 4 /* level */>;



		// The interrupt controller that this device is wired to.

		interrupt-parent = <&intc>;

	};

MAINTAINERS

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@@ -5040,6 +5040,8 @@ F: arch/metag/ 
F:	Documentation/metag/

F:	Documentation/devicetree/bindings/metag/

F:	drivers/clocksource/metag_generic.c

F:	drivers/irqchip/irq-metag.c

F:	drivers/irqchip/irq-metag-ext.c



MICROBLAZE ARCHITECTURE

M:	Michal Simek <monstr@monstr.eu>

arch/metag/kernel/irq.c

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@@ -6,6 +6,8 @@ 
#include <linux/kernel.h>

#include <linux/interrupt.h>

#include <linux/init.h>

#include <linux/irqchip/metag-ext.h>

#include <linux/irqchip/metag.h>

#include <linux/irqdomain.h>

#include <linux/ratelimit.h>
@@ -258,6 +260,9 @@ void __init init_IRQ(void) 


	irq_ctx_init(smp_processor_id());



	init_internal_IRQ();

	init_external_IRQ();



	if (machine_desc->init_irq)

		machine_desc->init_irq();

}

drivers/irqchip/Makefile

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obj-$(CONFIG_ARCH_BCM2835)		+= irq-bcm2835.o

obj-$(CONFIG_METAG)			+= irq-metag-ext.o

obj-$(CONFIG_METAG_PERFCOUNTER_IRQS)	+= irq-metag.o

obj-$(CONFIG_ARCH_SUNXI)		+= irq-sunxi.o

obj-$(CONFIG_VERSATILE_FPGA_IRQ)	+= irq-versatile-fpga.o

obj-$(CONFIG_ARCH_SPEAR3XX)		+= spear-shirq.o

drivers/irqchip/irq-metag-ext.c

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