The BCM2836 (Raspberry Pi 2) uses two levels of interrupt handling with the CPU-local interrupts being the root, so we need to register ours as chained off of the CPU's local interrupt. Signed-off-by: Eric Anholt <eric@xxxxxxxxxx> --- .../brcm,bcm2835-armctrl-ic.txt | 22 ++++++++++++++++++++++ drivers/irqchip/irq-bcm2835.c | 20 ++++++++++++++++++-- 2 files changed, 40 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt index 7da578d..8363bc4 100644 --- a/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt +++ b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt @@ -5,6 +5,10 @@ The BCM2835 contains a custom top-level interrupt controller, which supports controller, or the HW block containing it, is referred to occasionally as "armctrl" in the SoC documentation, hence naming of this binding. +The BCM2836 contains the same interrupt controller with the same +interrupts, but the per-CPU interrupt controller is the root, and an +interrupt there indicates that the ARMCTRL has an interrupt to handle. + Required properties: - compatible : should be "brcm,bcm2835-armctrl-ic" @@ -20,6 +24,12 @@ Required properties: The 2nd cell contains the interrupt number within the bank. Valid values are 0..7 for bank 0, and 0..31 for bank 1. +Optional properties: +- interrupt-parent : Specifies the parent interrupt controller when this + controller is the second level. +- interrupts : Specifies the interrupt on the parent for this interrupt + controller to handle. + The interrupt sources are as follows: Bank 0: @@ -102,9 +112,21 @@ Bank 2: Example: +/* BCM2835, first level */ +intc: interrupt-controller { + compatible = "brcm,bcm2835-armctrl-ic"; + reg = <0x7e00b200 0x200>; + interrupt-controller; + #interrupt-cells = <2>; +}; + +/* BCM2836, second level */ intc: interrupt-controller { compatible = "brcm,bcm2835-armctrl-ic"; reg = <0x7e00b200 0x200>; interrupt-controller; #interrupt-cells = <2>; + + interrupt-parent = <&local_intc>; + interrupts = <8>; }; diff --git a/drivers/irqchip/irq-bcm2835.c b/drivers/irqchip/irq-bcm2835.c index 382450a..dc6b159 100644 --- a/drivers/irqchip/irq-bcm2835.c +++ b/drivers/irqchip/irq-bcm2835.c @@ -97,6 +97,7 @@ struct armctrl_ic { static struct armctrl_ic intc __read_mostly; static void __exception_irq_entry bcm2835_handle_irq( struct pt_regs *regs); +static void bcm2835_chained_handle_irq(unsigned int irq, struct irq_desc *desc); static void armctrl_mask_irq(struct irq_data *d) { @@ -143,7 +144,7 @@ static int __init armctrl_of_init(struct device_node *node, struct device_node *parent) { void __iomem *base; - int irq, b, i; + int irq, parent_irq, b, i; base = of_iomap(node, 0); if (!base) @@ -169,7 +170,14 @@ static int __init armctrl_of_init(struct device_node *node, } } - set_handle_irq(bcm2835_handle_irq); + parent_irq = irq_of_parse_and_map(node, 0); + if (!parent_irq) { + /* No parent IRQ, so we're the root interrupt controller */ + set_handle_irq(bcm2835_handle_irq); + } else { + irq_set_chained_handler(parent_irq, bcm2835_chained_handle_irq); + } + return 0; } @@ -220,4 +228,12 @@ static void __exception_irq_entry bcm2835_handle_irq( handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs); } +static void bcm2835_chained_handle_irq(unsigned int irq, struct irq_desc *desc) +{ + u32 hwirq; + + while ((hwirq = get_next_armctrl_hwirq()) != ~0) + generic_handle_irq(irq_linear_revmap(intc.domain, hwirq)); +} + IRQCHIP_DECLARE(bcm2835_armctrl_ic, "brcm,bcm2835-armctrl-ic", armctrl_of_init); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html