Hi Wolfgang,

On 07/31/2011 06:19 PM, Wolfgang Grandegger wrote:

On 07/31/2011 12:38 PM, Felix Radensky wrote:

quoted

Hi,

I'm running kernel 3.0 on a custom board based on Freescale P1022.
The interrupt line of on-board FPGA is connected to GPIO2_9. FPGA
IRQ is level, active low. The GPIOs are mapped like this:

GPIOs 160-191, /soc@ffe00000/gpio-controller@f200:

GPIOs 192-223, /soc@ffe00000/gpio-controller@f100:

GPIOs 224-255, /soc@ffe00000/gpio-controller@f000:

I've verified that pin mixing is done correctly, and the
FPGA IRQ line is indeed configured as GPIO.

I have the following code in my driver:

     #define FPGA_IRQ_GPIO 169

     err = gpio_request(FPGA_IRQ_GPIO, "FPGA IRQ");
     if (err) {
         printk(KERN_ERR "Failed to request FPGA IRQ GPIO, err=%d\n", err);
         goto out;
     }

     gpio_direction_input(FPGA_IRQ_GPIO);

     irq = gpio_to_irq(FPGA_IRQ_GPIO);
     if (irq<  0) {
         printk(KERN_ERR "Failed to map FPGA GPIO to IRQ\n");
         goto out;
     }

     err = request_irq(irq, gsat_interrupt,
               IRQF_TRIGGER_FALLING, DRVNAME, priv);

     Interrupt handler reads FPGA interrupt status register to clear
interrupt
     and exits.

     What happens when I load my driver is single execution of interrupt
handler
     followed by system freeze. Even if I call disable_irq() in interrupt
handler the
     system still freezes.

Try disable_irq_nosync() instead.

Thanks.  However this doesn't help either.

Felix.