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Commit 64e0f8ba authored by Nishanth Menon's avatar Nishanth Menon Committed by Jason Cooper
Browse files

irqchip: crossbar: Introduce ti, irqs-skip to skip irqs that bypass crossbar 



When, in the system due to varied reasons, interrupts might be unusable
due to hardware behavior, but register maps do exist, then those interrupts
should be skipped while mapping irq to crossbars.

Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Signed-off-by: default avatarSricharan R <r.sricharan@ti.com>
Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Link: https://lkml.kernel.org/r/1403766634-18543-4-git-send-email-r.sricharan@ti.com


Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 6f16fc87

Documentation/devicetree/bindings/arm/omap/crossbar.txt

+6 −0
Original line number Diff line number Diff line
@@ -17,6 +17,11 @@ Required properties: 
		 so crossbar bar driver should not consider them as free

		 lines.



Optional properties:

- ti,irqs-skip: This is similar to "ti,irqs-reserved", but these are for

  SOC-specific hard-wiring of those irqs which unexpectedly bypasses the

  crossbar. These irqs have a crossbar register, but still cannot be used.



Examples:

		crossbar_mpu: @4a020000 {

			compatible = "ti,irq-crossbar";
@@ -24,4 +29,5 @@ Examples: 
			ti,max-irqs = <160>;

			ti,reg-size = <2>;

			ti,irqs-reserved = <0 1 2 3 5 6 131 132 139 140>;

			ti,irqs-skip = <10 133 139 140>;

		};

drivers/irqchip/irq-crossbar.c

+20 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 


#define IRQ_FREE	-1

#define IRQ_RESERVED	-2

#define IRQ_SKIP	-3

#define GIC_IRQ_START	32



/*
@@ -160,6 +161,25 @@ static int __init crossbar_of_init(struct device_node *node) 
		}

	}



	/* Skip irqs hardwired to bypass the crossbar */

	irqsr = of_get_property(node, "ti,irqs-skip", &size);

	if (irqsr) {

		size /= sizeof(__be32);



		for (i = 0; i < size; i++) {

			of_property_read_u32_index(node,

						   "ti,irqs-skip",

						   i, &entry);

			if (entry > max) {

				pr_err("Invalid skip entry\n");

				ret = -EINVAL;

				goto err3;

			}

			cb->irq_map[entry] = IRQ_SKIP;

		}

	}





	cb->register_offsets = kzalloc(max * sizeof(int), GFP_KERNEL);

	if (!cb->register_offsets)

		goto err3;