Messages in this thread Patch in this message | | | From | Zubair Lutfullah Kakakhel <> | Subject | [Patch V6 4/6] irqchip: xilinx: Add support for parent intc | Date | Mon, 31 Oct 2016 12:16:45 +0000 |
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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>
--- V5 -> V6 Use chained_irq_enter and chained_irq_exit Add error check for irq_of_parse_and_map Rebase to v4.9-rc3
V4 -> V5 Rebased to v4.9-rc1 Missing curly braces
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-xilinx-intc.c | 36 ++++++++++++++++++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-xilinx-intc.c b/drivers/irqchip/irq-xilinx-intc.c index 1f37089..ea15446 100644 --- a/drivers/irqchip/irq-xilinx-intc.c +++ b/drivers/irqchip/irq-xilinx-intc.c @@ -12,9 +12,11 @@ #include <linux/irqdomain.h> #include <linux/irq.h> #include <linux/irqchip.h> +#include <linux/irqchip/chained_irq.h> #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 +156,26 @@ static int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) .map = xintc_map, }; +static void xil_intc_irq_handler(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + u32 pending; + + chained_irq_enter(chip, desc); + do { + pending = xintc_get_irq(); + if (pending == -1U) + break; + generic_handle_irq(pending); + } while (true); + chained_irq_exit(chip, desc); +} + 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; if (xintc_irqc) { @@ -220,7 +237,22 @@ static int __init xilinx_intc_of_init(struct device_node *intc, goto err_alloc; } - 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 { + pr_err("irq-xilinx: interrupts property not in DT\n"); + ret = -EINVAL; + goto err_alloc; + } + + + } else { + irq_set_default_host(root_domain); + } return 0; -- 1.9.1
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