[Patch v3 03/11] irqchip: axi-intc: Add support for parent intc
From: Zubair Lutfullah Kakakhel <hidden>
Date: 2016-08-31 16:37:48
Also in:
linux-mips, lkml
Subsystem:
irqchip drivers, the rest · Maintainers:
Thomas Gleixner, Linus Torvalds
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 <redacted> --- 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