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    Subject[Patch v3 03/11] irqchip: axi-intc: Add support for parent intc
    Date
    The MIPS based xilfpga platform has the following IRQ structure

    Peripherals --> xilinx_intcontroller -> mips_cpu_int controller

    Add support for the driver to chain the irq handler

    Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>

    ---
    V2 -> V3
    Reused existing parent node instead of finding again.
    Cleanup up handler based on review

    V1 -> V2

    No change
    ---
    drivers/irqchip/irq-axi-intc.c | 24 +++++++++++++++++++++++-
    1 file changed, 23 insertions(+), 1 deletion(-)

    diff --git a/drivers/irqchip/irq-axi-intc.c b/drivers/irqchip/irq-axi-intc.c
    index cb69241..30bb084 100644
    --- a/drivers/irqchip/irq-axi-intc.c
    +++ b/drivers/irqchip/irq-axi-intc.c
    @@ -15,6 +15,7 @@
    #include <linux/of_address.h>
    #include <linux/io.h>
    #include <linux/bug.h>
    +#include <linux/of_irq.h>

    /* No one else should require these constants, so define them locally here. */
    #define ISR 0x00 /* Interrupt Status Register */
    @@ -154,11 +155,23 @@ static const struct irq_domain_ops xintc_irq_domain_ops = {
    .map = xintc_map,
    };

    +static void xil_intc_irq_handler(struct irq_desc *desc)
    +{
    + u32 pending;
    +
    + do {
    + pending = get_irq();
    + if (pending == -1U)
    + break;
    + generic_handle_irq(pending);
    + } while (true);
    +}
    +
    static int __init xilinx_intc_of_init(struct device_node *intc,
    struct device_node *parent)
    {
    u32 nr_irq;
    - int ret;
    + int ret, irq;
    struct xintc_irq_chip *irqc;

    irqc = kzalloc(sizeof(*irqc), GFP_KERNEL);
    @@ -211,6 +224,15 @@ static int __init xilinx_intc_of_init(struct device_node *intc,
    root_domain = irq_domain_add_linear(intc, nr_irq, &xintc_irq_domain_ops,
    irqc);

    + if (parent) {
    + irq = irq_of_parse_and_map(intc, 0);
    + if (irq)
    + irq_set_chained_handler_and_data(irq,
    + xil_intc_irq_handler,
    + root_domain);
    +
    + }
    +
    irq_set_default_host(root_domain);

    return 0;
    --
    1.9.1
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