Interrupt Handler in Kernel Module

Does anyone have a working linux device driver that works for interrupt of custom ip-cores?

The AR 51138 shows an example ip-core that contains an own interrupt controller that supports multiple interrupt sources and registers into the global interrupt controller of the Zynq. But the example software is only bare-metal not linux.

http://www.xilinx.com/support/answers/51138.htm

0 Former Member over 12 years ago

I use uio to communicate and react on interrupt.
Maybe my little module can help you:
http://pastebin.com/Huhpuk1s

In userspace you can then use
read(uio0_fd, &irq_count, 4);
to wait for an interrupt.
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0 Former Member over 12 years ago

I am trying to get AR# 50572 into a linux application.

You module got adjusted a bit to match the right adresses and such but for the rest showed no problems.

However, how do i exactly use this module? Right now im trying something like this:
-start kernel
-load module (insmod)
-start application (created in SDK)

The application:
-opens /dev/mem
-map the axi-timer
-initialize timer
-infinite loop with read(mem_fd, &irq_count, 4); in it

irq_count is the interrupt routine in my application i guess? it's not in the module. i declared it as:
void irq_count()
{
printf("Interrupt..
");
}
I'm kind of expecting this to be be wrong, incomplete or both but i can't say for sure. i can compile and run this though.

any help on what i should do to get this interrupt handled?
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0 Former Member over 11 years ago in reply to Former Member

Hi dear,
We are trying to generate AXI GPIO interrupt and want to handle this in C program in linux environment. Could you guide us how exactly can we use you little module or any other information related to this.
thank you
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0 Former Member over 11 years ago

A short while ago i did the same. this is the thread i used to gather infrmation:
http://forums.xilinx.com/t5/Embedded-Linux/AR-50572-Axi-timer-interrupts-in-linux/td-p/335077

The driver i posted there is able to start on its own, but you can use a script/application to write&read.
it stops after 100 interrupts, so you might need/want to change that too.
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0 Former Member over 11 years ago in reply to Former Member

Are you getting printk messages in irq handler.
I have taken your module and compiled it and inserted this module.
but i am not getting any messages
could you please help me out in this.
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0 Former Member over 11 years ago in reply to Former Member

Yes, you should seee a number of messages just by loading the module.
http://i259.photobucket.com/albums/hh290/Brogath/syscalldriver_zpsa4a391b1.png?t=1375971477

The url is ascreenshot from my terminal after loading the module.

you could try to see if the kernel messages appear if you type 'dmesg'.
if youo do not see any messages at all you coudl try to replace the printk commands (especially in the init procedure) with a version that you know that works for you.

if you still do not see any messages try to make another module that just prints something after insmod and rmmod and see if the problem remains. (becasue if it doesnt, you might want to check the kernel instead of the module)
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0 Former Member over 11 years ago in reply to Former Member

Interrupts is done with read()

if ((uio0_fd = open("/dev/uio0", O_RDONLY|O_SYNC)) < 0) {
perror("open uio0");
}

// wait for interrupt
if (read(uio0_fd, &irq_count, 4) != 4) {
perror("read uio0");
}
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0 Former Member over 10 years ago

Hi,
I was successfull in registering and and handling the interrupt in kernel space using the request_irq() function call in kernel space. I tested it oin the AXI GPIO with interrupts enabled.
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0 Former Member over 10 years ago in reply to Former Member

i.designed a axi-gpio under PL .now i want use it in linux,when i set the interrupt .i found we must to set .chip struct .and i get confused .can you give me a sample?
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0 syedzabi95@ over 8 years ago

Hi,
I am new to zedboard, Can anyone suggest how to generate software interrupts with linux in SMP configuration

Thanks
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