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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You will have to program GPIO’s to select appropriate external
IRQ as they are shared .<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
linuxppc-dev-bounces+tmarri=amcc.com@lists.ozlabs.org
[mailto:linuxppc-dev-bounces+tmarri=amcc.com@lists.ozlabs.org] <b>On Behalf Of </b>Lada
Podivin<br>
<b>Sent:</b> Friday, June 19, 2009 1:01 AM<br>
<b>To:</b> linuxppc-dev@lists.ozlabs.org<br>
<b>Subject:</b> kilauea/405ex external interrupts<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi,<br>
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:<br>
..<br>
<br>
UIC1: interrupt-controller1 {<br>
compatible =
"ibm,uic-405ex","ibm,uic";<br>
interrupt-controller;<br>
cell-index = <1>;<br>
dcr-reg = <0x0d0 0x009>;<br>
#address-cells = <0>;<br>
#size-cells = <0>;<br>
#interrupt-cells = <2>;<br>
interrupts = <0x1e 0x4 0x1f 0x4>;
/* cascade */<br>
interrupt-parent = <&UIC0>;<br>
};<br>
<br>
EXTEVENT: external_event {<br>
device_type = "external";<br>
#address-cells = <0>;<br>
#size-cells = <0>;<br>
#interrupt-cells = <2>;<br>
interrupts = <0x1e 0x1>;<br>
interrupt-parent = <&UIC1>;<br>
};<br>
...<br>
<br>
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. <br>
<br>
Am I suppose to configure anything else? (e. g. pin multiplexing, further
device-tree tuning...) Thank you!<br>
<br>
Best regards,<br>
Ladi<o:p></o:p></p>
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