kilauea/405ex external interrupts

[Tirumala Reddy Marri]

You will have to program GPIO's to select appropriate external IRQ as
they are shared .

 

From: linuxppc-dev-bounces+tmarri=amcc.com at lists.ozlabs.org
[mailto:linuxppc-dev-bounces+tmarri=amcc.com at lists.ozlabs.org] On Behalf
Of Lada Podivin
Sent: Friday, June 19, 2009 1:01 AM
To: linuxppc-dev at lists.ozlabs.org
Subject: kilauea/405ex external interrupts

 

Hi,
I'm writing a linux driver that uses an external interrupt (ppc 405ex).
I'm using GPIO pin 30 (external IRQ 1) connected to UIC1. I'm aware of
the virtual interrupt stuff, so I added a new node to my device tree in
order to get proper virtual IRQ number. This node describes an external
event and its connection to UIC via the mentioned ext. int. Here is a
sample of the divce-tree:
..

UIC1: interrupt-controller1 {
        compatible = "ibm,uic-405ex","ibm,uic";
        interrupt-controller;
        cell-index = <1>;
        dcr-reg = <0x0d0 0x009>;
        #address-cells = <0>;
        #size-cells = <0>;
        #interrupt-cells = <2>;
        interrupts = <0x1e 0x4 0x1f 0x4>; /* cascade */
        interrupt-parent = <&UIC0>;
};

EXTEVENT: external_event {
        device_type = "external";
        #address-cells = <0>;
        #size-cells = <0>;
        #interrupt-cells = <2>;
        interrupts = <0x1e 0x1>;
        interrupt-parent = <&UIC1>;
};
...

Then I use function "irq_of_parse_and_map()" which returns the virtual
IRQ number 22. So, "request_irq()" seems to be satisfied with this
number. I can see this interrupt in the /proc/interrupts. But! When I
connect a signal source to the pin 30, nothing happens - the interrupt
service routine isn't called. 

Am I suppose to configure anything else? (e. g. pin multiplexing,
further device-tree tuning...) Thank you!

Best regards,
Ladi

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