From: Guillaume Dargaud <dargaud@lpsc•in2p3.fr>
To: linuxppc-dev@lists•ozlabs.org
Subject: Getting the IRQ number (Was: Basic driver devel questions ?)
Date: Wed, 1 Dec 2010 17:35:58 +0100 [thread overview]
Message-ID: <201012011735.58769.dargaud@lpsc.in2p3.fr> (raw)
In-Reply-To: <1291205941.11595.9.camel@concordia>
> I guess it depends how basic they are :)
>
> If they're basic _powerpc_ driver questions then this is probably the
> right place.
>
> But I'd say just ask and maybe someone will be able to help, or maybe
> they'll point you somewhere else.
OK, here goes then: how do I get the IRQ number so that I can install an
interrupt handler on it ?
In my dts file I have:
xps_acqui_data_0: xps-acqui-data@c9800000 {
compatible = "xlnx,xps-acqui-data-3.00.a";
interrupt-parent = <&xps_intc_0>;
interrupts = < 0 2 >;
reg = < 0xc9800000 0x10000 >;
xlnx,family = "virtex4";
xlnx,include-dphase-timer = <0x1>;
xlnx,mplb-awidth = <0x20>;
xlnx,mplb-clk-period-ps = <0x2710>;
xlnx,mplb-dwidth = <0x40>;
xlnx,mplb-native-dwidth = <0x40>;
xlnx,mplb-p2p = <0x0>;
xlnx,mplb-smallest-slave = <0x20>;
} ;
In my minimal driver init, I have:
first = MKDEV (my_major, my_minor);
register_chrdev_region(first, count, NAME);
cdev_init(my_cdev, &fops);
cdev_add (my_cdev, first, count);
So far so good.
Now how do I connect the dots between the hardware definitions from the dts and
my driver ?
I have:
# ll /proc/device-tree/plb@0/xps-acqui-data@c9800000/
-r--r--r-- 1 root root 27 Dec 1 16:26 compatible
-r--r--r-- 1 root root 4 Dec 1 16:26 interrupt-parent
-r--r--r-- 1 root root 8 Dec 1 16:26 interrupts
-r--r--r-- 1 root root 15 Dec 1 16:26 name
-r--r--r-- 1 root root 8 Dec 1 16:26 reg
-r--r--r-- 1 root root 8 Dec 1 16:26 xlnx,family
-r--r--r-- 1 root root 4 Dec 1 16:26 xlnx,include-dphase-
timer
-r--r--r-- 1 root root 4 Dec 1 16:26 xlnx,mplb-awidth
-r--r--r-- 1 root root 4 Dec 1 16:26 xlnx,mplb-clk-period-ps
-r--r--r-- 1 root root 4 Dec 1 16:26 xlnx,mplb-dwidth
-r--r--r-- 1 root root 4 Dec 1 16:26 xlnx,mplb-native-dwidth
-r--r--r-- 1 root root 4 Dec 1 16:26 xlnx,mplb-p2p
-r--r--r-- 1 root root 4 Dec 1 16:26 xlnx,mplb-smallest-
slave
But first I'm not sure where to find the IRQ in there, and also I'm not sure if
reading the filesystem from a module is allowed.
How do I know if this interrupt is shared or not (is it important ?)
Thanks
--
Guillaume Dargaud
http://www.gdargaud.net/
next prev parent reply other threads:[~2010-12-01 16:36 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-01 10:15 Basic driver devel questions ? Guillaume Dargaud
2010-12-01 12:19 ` Michael Ellerman
2010-12-01 16:35 ` Guillaume Dargaud [this message]
2010-12-01 18:29 ` Getting the IRQ number (Was: Basic driver devel questions ?) Philipp Ittershagen
2010-12-01 18:41 ` Scott Wood
2010-12-02 15:36 ` Guillaume Dargaud
2010-12-02 16:17 ` Timur Tabi
2010-12-02 17:47 ` Guillaume Dargaud
2010-12-02 20:22 ` Benjamin Herrenschmidt
2010-12-03 14:58 ` Guillaume Dargaud
2010-12-03 15:37 ` Martyn Welch
2010-12-06 5:29 ` Michael Ellerman
2010-12-06 6:35 ` Jeremy Kerr
2010-12-06 11:56 ` Michael Ellerman
2010-12-06 9:58 ` Guillaume Dargaud
2010-12-06 12:07 ` Michael Ellerman
2010-12-06 14:44 ` Guillaume Dargaud
2010-12-06 14:47 ` David Laight
2010-12-08 1:03 ` Michael Ellerman
2010-12-08 10:18 ` Guillaume Dargaud
2010-12-08 13:45 ` Michael Ellerman
2010-12-08 15:52 ` Guillaume Dargaud
2010-12-09 0:22 ` Michael Ellerman
2010-12-10 16:21 ` Guillaume Dargaud
2010-12-12 21:46 ` Michael Ellerman
2010-12-08 19:20 ` Joachim Förster
2010-12-06 12:17 ` David Laight
2010-12-07 12:46 ` Guillaume Dargaud
2010-12-08 0:50 ` Michael Ellerman
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