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Date: Sun, 24 Feb 2008 18:33:27 +0100
From: Wolfgang Grandegger <wg@domain.hid>
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Subject: Re: [Xenomai-help] BF537-Stamp pushbutton interrupts
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To: Andras Garzo <garzoand@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>

Andras Garzo wrote:
> Hi all,
> 
> I'm trying to handle the BF537-STAMP pushbutton interrupts with rtdm, but
> my system hangs when calling rtdm_irq_request with the following message:
> 
> BUG: failure at arch/blackfin/kernel/bfin_gpio.c:504/set_gpio_maska()!
> Kernel panic - not syncing: BUG!
> 
> I'm using linux kernel 2.6.22 and Xenomai 2.4.1. It could be a kernel bug?
> The following code worked well on 2.6.19 with Xenomai 2.3.2:
> 
> #include <linux/list.h>
> #include <linux/init.h>
> #include <linux/types.h>
> #include <linux/interrupt.h>
> #include <linux/module.h>
> #include <linux/fs.h>
> #include <linux/kernel.h>
> #include <linux/time.h>
> #include <asm/irq.h>
> #include <rtdm/rtdm.h>
> #include <rtdm/rtdm_driver.h>
> 
> #define PPSMOD_IRQ IRQ_PF4
> 
> 
> struct ppsmod_dev
> {
>     unsigned int irqnum;
> };
> 
> rtdm_irq_t irq_handle;
> 
> static int ppsmod_irqhandler(rtdm_irq_t *handle)
> {
>     printk(KERN_WARNING "ppsmod: PPS interrupt triggered.\n");
>     return IRQ_HANDLED;
> }
> 
> static int __init ppsmod_init(void)
> {
>     int alloc_size = sizeof(struct ppsmod_dev);
>     struct ppsmod_dev *dev = (struct ppsmod_dev*)kmalloc(alloc_size, 
> GFP_KERNEL);
>     int ret;
>    
>     printk(KERN_WARNING "ppsmod: module loaded.\n");
>    
>     // installing IRQ handler
>     if(rtdm_irq_request(&irq_handle, PPSMOD_IRQ, &ppsmod_irqhandler, 
> RTDM_IRQTYPE_EDGE, NULL, dev))
>     {
>         printk(KERN_WARNING "ppsmod: PF4 irq is not free.\n");
>         return -EBUSY;
>     }
>     printk(KERN_WARNING "ppsmod: 23231\n");
>     set_irq_type(IRQ_PF4, IRQF_TRIGGER_RISING);
>     rtdm_irq_enable(&irq_handle);

Be aware, that starting with Xenomai v2.4, the interrupt is
automatically enabled by rtdm_irq_request().

Wolfgang.