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Date: Thu, 1 Sep 2016 17:50:57 +0100 From: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com> To: <monstr@...str.eu>, <ralf@...ux-mips.org>, <tglx@...utronix.de>, <jason@...edaemon.net>, <marc.zyngier@....com> CC: <soren.brinkmann@...inx.com>, <Zubair.Kakakhel@...tec.com>, <linux-kernel@...r.kernel.org>, <linux-mips@...ux-mips.org>, <michal.simek@...inx.com>, <netdev@...r.kernel.org> Subject: [Patch v4 04/12] irqchip: axi-intc: Add support for parent intc 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@...tec.com> --- V3 -> V4 Clean up if/else when a parent is found Pass irqchip structure to handler as data 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 | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/irq-axi-intc.c b/drivers/irqchip/irq-axi-intc.c index ac31548..683b1f7 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 = xintc_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); @@ -217,7 +230,15 @@ 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); - irq_set_default_host(root_domain); + if (parent) { + irq = irq_of_parse_and_map(intc, 0); + if (irq) + irq_set_chained_handler_and_data(irq, + xil_intc_irq_handler, + irqc); + + } else + irq_set_default_host(root_domain); return 0; -- 1.9.1
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