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    Subject[PATCH v4 02/11] irqchip: nvic: support hierarchy irq domain
    Date
    Add support for hierarchy irq domains. This is required to stack
    the MSCM interrupt router and the NVIC controller found in Vybrid
    SoC.

    Signed-off-by: Stefan Agner <stefan@agner.ch>
    ---
    drivers/irqchip/Kconfig | 1 +
    drivers/irqchip/irq-nvic.c | 28 +++++++++++++++++++++++++++-
    2 files changed, 28 insertions(+), 1 deletion(-)

    diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
    index cc79d2a..ab8de26 100644
    --- a/drivers/irqchip/Kconfig
    +++ b/drivers/irqchip/Kconfig
    @@ -30,6 +30,7 @@ config ARM_GIC_V3_ITS
    config ARM_NVIC
    bool
    select IRQ_DOMAIN
    + select IRQ_DOMAIN_HIERARCHY
    select GENERIC_IRQ_CHIP

    config ARM_VIC
    diff --git a/drivers/irqchip/irq-nvic.c b/drivers/irqchip/irq-nvic.c
    index 4ff0805..5fac910 100644
    --- a/drivers/irqchip/irq-nvic.c
    +++ b/drivers/irqchip/irq-nvic.c
    @@ -49,6 +49,31 @@ nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
    handle_IRQ(irq, regs);
    }

    +static int nvic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
    + unsigned int nr_irqs, void *arg)
    +{
    + int i, ret;
    + irq_hw_number_t hwirq;
    + unsigned int type = IRQ_TYPE_NONE;
    + struct of_phandle_args *irq_data = arg;
    +
    + ret = irq_domain_xlate_onecell(domain, irq_data->np, irq_data->args,
    + irq_data->args_count, &hwirq, &type);
    + if (ret)
    + return ret;
    +
    + for (i = 0; i < nr_irqs; i++)
    + irq_map_generic_chip(domain, virq + i, hwirq + i);
    +
    + return 0;
    +}
    +
    +static const struct irq_domain_ops nvic_irq_domain_ops = {
    + .xlate = irq_domain_xlate_onecell,
    + .alloc = nvic_irq_domain_alloc,
    + .free = irq_domain_free_irqs_top,
    +};
    +
    static int __init nvic_of_init(struct device_node *node,
    struct device_node *parent)
    {
    @@ -70,7 +95,8 @@ static int __init nvic_of_init(struct device_node *node,
    irqs = NVIC_MAX_IRQ;

    nvic_irq_domain =
    - irq_domain_add_linear(node, irqs, &irq_generic_chip_ops, NULL);
    + irq_domain_add_linear(node, irqs, &nvic_irq_domain_ops, NULL);
    +
    if (!nvic_irq_domain) {
    pr_warn("Failed to allocate irq domain\n");
    return -ENOMEM;
    --
    2.3.5


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