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@xxxxxxxxxx>
---
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
