Hi,
I'm running Linux 2.6.26 on custom board based on AMCC 460EX.
I'm trying to catch interrupt generated by CPLD, but without any luck.
The interrupt is connected to GPIO 45. U-Boot (1.3.4) configures this
pin as external interrupt 12 (interrupt 20 in UIC 3). I've added the
following
entry to board device tree (in opb section)
[EMAIL PROTECTED],0 {
device_type = "cpld";
interrupts = <20 1>;
interrupt-parent = <&UIC3>;
};
In my driver I do the following:
/* Find CPLD node in device tree */
np = of_find_node_by_type(NULL, "cpld");
if (!np) {
printk(KERN_INFO "No CPLD found in device tree\n");
return -1;
}
/* Get and map irq number from device tree */
cpld_irq = irq_of_parse_and_map(np, 0);
if (cpld_irq == NO_IRQ) {
printk(KERN_ERR "irq_of_parse_and_map failed\n");
of_node_put(np);
return -ENODEV;
}
/* Register CPLD interrupt handler */
rc = request_irq(cpld_irq, cpld_interrupt,
IRQF_TRIGGER_LOW, "CPLD", NULL);
And I see this interrupt in /proc/interrups after loading
the driver. However interrupt handler is never invoked,
although hardware guys see that GPIO line goes down
when interrupt is generated.
What am I doing wrong ?
Thanks a lot in advance ?
Felix.
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