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authorZubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>2016-11-14 12:13:49 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2016-11-29 09:14:49 +0000
commit9689c99e49509f19abd4a6c040bfc7fc051ef65b (patch)
treef59592afb2a317d1d31d5b464099adf1b40b1833 /drivers/irqchip
parent2120a43527f3bd0efba0e893799acdd1486c2d1b (diff)
downloadlinux-9689c99e49509f19abd4a6c040bfc7fc051ef65b.tar.bz2
irqchip/xilinx: 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@imgtec.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-xilinx-intc.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-xilinx-intc.c b/drivers/irqchip/irq-xilinx-intc.c
index 34ec609ea898..971c141d575d 100644
--- a/drivers/irqchip/irq-xilinx-intc.c
+++ b/drivers/irqchip/irq-xilinx-intc.c
@@ -12,10 +12,12 @@
#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/jump_label.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 */
@@ -133,11 +135,26 @@ static const struct irq_domain_ops xintc_irq_domain_ops = {
.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) {
@@ -196,7 +213,20 @@ static int __init xilinx_intc_of_init(struct device_node *intc,
goto err_alloc;
}
- irq_set_default_host(irqc->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(irqc->root_domain);
+ }
return 0;