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Commit 16a8083c authored by Qais Yousef's avatar Qais Yousef Committed by Thomas Gleixner
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irqchip/mips-gic: Add new DT property to reserve IPIs 



The new property will allow to specify the range of GIC hwirqs to use for IPIs.

This is an optinal property. We preserve the previous behaviour of allocating
the last 2 * gic_vpes if it's not specified or DT is not supported.

Signed-off-by: default avatarQais Yousef <qais.yousef@imgtec.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Acked-by: default avatarRalf Baechle <ralf@linux-mips.org>
Cc: <jason@lakedaemon.net>
Cc: <marc.zyngier@arm.com>
Cc: <jiang.liu@linux.intel.com>
Cc: <linux-mips@linux-mips.org>
Cc: <lisa.parratt@imgtec.com>
Cc: Qais Yousef <qsyousef@gmail.com>
Link: http://lkml.kernel.org/r/1449580830-23652-20-git-send-email-qais.yousef@imgtec.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 7eb8c99d

Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt

+7 −0
Original line number Diff line number Diff line
@@ -23,6 +23,12 @@ Optional properties: 
- mti,reserved-cpu-vectors : Specifies the list of CPU interrupt vectors

  to which the GIC may not route interrupts.  Valid values are 2 - 7.

  This property is ignored if the CPU is started in EIC mode.

- mti,reserved-ipi-vectors : Specifies the range of GIC interrupts that are

  reserved for IPIs.

  It accepts 2 values, the 1st is the starting interrupt and the 2nd is the size

  of the reserved range.

  If not specified, the driver will allocate the last 2 * number of VPEs in the

  system.



Required properties for timer sub-node:

- compatible : Should be "mti,gic-timer".
@@ -44,6 +50,7 @@ Example: 
		#interrupt-cells = <3>;



		mti,reserved-cpu-vectors = <7>;

		mti,reserved-ipi-vectors = <40 8>;



		timer {

			compatible = "mti,gic-timer";

drivers/irqchip/irq-mips-gic.c

+10 −2
Original line number Diff line number Diff line
@@ -957,6 +957,7 @@ static void __init __gic_init(unsigned long gic_base_addr, 
			      struct device_node *node)

{

	unsigned int gicconfig;

	unsigned int v[2];



	__gic_base_addr = gic_base_addr;
@@ -1027,8 +1028,15 @@ static void __init __gic_init(unsigned long gic_base_addr, 


	gic_ipi_domain->bus_token = DOMAIN_BUS_IPI;



	if (node &&

	    !of_property_read_u32_array(node, "mti,reserved-ipi-vectors", v, 2)) {

		bitmap_set(ipi_resrv, v[0], v[1]);

	} else {

		/* Make the last 2 * gic_vpes available for IPIs */

	bitmap_set(ipi_resrv, gic_shared_intrs - 2 * gic_vpes, 2 * gic_vpes);

		bitmap_set(ipi_resrv,

			   gic_shared_intrs - 2 * gic_vpes,

			   2 * gic_vpes);

	}



	gic_basic_init();

}