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Date: Wed, 15 Oct 2008 16:43:30 +0200
From: Felix Radensky <felix@embedded-sol.com>
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To: linuxppc-embedded@ozlabs.org
Subject: External interrupt on 460EX
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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)

cpld@2,0 {
    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.