diff options
| author | Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> | 2016-11-14 12:13:49 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-11-29 09:14:49 +0000 |
| commit | 9689c99e49509f19abd4a6c040bfc7fc051ef65b (patch) | |
| tree | f59592afb2a317d1d31d5b464099adf1b40b1833 /drivers/irqchip | |
| parent | 2120a43527f3bd0efba0e893799acdd1486c2d1b (diff) | |
| download | linux-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.c | 34 |
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; |