ISR for nmi is not working

Hi,

  I am attaching one sample handler.c  file by following this I am writing my Handler.c File.

  Please check it and suggest me the solution.

#include <linux/kernel.h>
#include <linux/module.h>               // for Module init & exit functions
#include <linux/interrupt.h>           /*!We want an interrupt */
#include <mach/gpio.h>


#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <linux/sched.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>


/*!******************************Defines section ******************************/


  #define External_nmi  7


  unsigned long irq_cnt = 0;
  unsigned char irq_flag = 0;
  unsigned long int cnt_intr;


irqreturn_t extn_irq_handler(int irq, void *dev_id, struct pt_regs *regs);


/*!***********************End of Prototype section*****************************/




irqreturn_t extn_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
{

   // Want to toggle LED.
   //for this need information of LED PIN base address
    
    return IRQ_HANDLED;
}

int init_module()
{
        int result      = 0;
        int short_int   = 0;


        printk(KERN_INFO "External Interuppt initialized\n");
  /*******************************************************************************************************************************/
         int request_irq(unsigned int irq, irqreturn_t(*handler)(int, void*, struct pt_regs*), unsigned long flag, const char *dev_name,
                      void *dev_id);

          0 is return if request_irq() success, or negative error code if fails.

              unsigned int irq:                      Interrupt num to be requested
              irqreturn_t(*handler)(int, void*, struct pt_regs*): Pointer to the handler function to be installed
              unsigned long flag: SA_INTERRUP,SA_SHIRQ,SA_SAMPLE_RANDOM.                   
              const char *dev_name: string pass to request_irq()func used in /proc/interrupts to show owner of interrupt
              void *dev_id : pointer used to share interrupt line, if interrupt is not shared dev_id can be set to NULL.


   /*******************************************************************************************************************************/
        
          result = request_irq(External_nmi, (irqreturn_t) extn_irq_handler,IRQF_DISABLED,"EXTn_irq_handler", NULL);

 

       if(result)
         {
            printk(KERN_INFO "Failed to get requested interrupt");
         }
        
       else

         outb(); // enable interrupt reporting 
         
   return ret;
}

/*
 * Cleanup
 */
void cleanup_module()
{
  free_irq(extn_irq_handler, NULL);
        
}

MODULE_LICENSE("GPL");

Have you checked if this interrupt isn't already taken by another handler?

Hi Biser,

   I don't know where to find it in code but, on schematic of Starter Kit I find out that on NMI (AM335x_EXTINT) pin

   input is coming from two sources, SW5 and AR8031_AL1A IC (ETH1_INTn signal). But in code on which files 

   I will get information about it.

  Regards,

  Vishal

Hi,

  Please guide me further. Waiting for response.

 Regards,

 Vishal.