From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Mon, 25 Feb 2008 21:17:58 +0100
From: Andras Garzo <garzoand@domain.hid>
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Subject: Re: [Xenomai-help] BF537-Stamp pushbutton interrupts
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Thanks for help, now it's working...

Andras

Wolfgang Grandegger wrote:
> 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.
>