Hi Wolfgang,
On 07/31/2011 06:19 PM, Wolfgang Grandegger wrote:
On 07/31/2011 12:38 PM, Felix Radensky wrote:
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.
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