From: Wolfgang Grandegger <wg@grandegger•com>
To: Felix Radensky <felix@embedded-sol•com>
Cc: "linuxppc-dev@ozlabs•org" <linuxppc-dev@ozlabs•org>,
Tabi Timur-B04825 <B04825@freescale•com>
Subject: Re: GPIO IRQ on P1022
Date: Sun, 31 Jul 2011 17:19:33 +0200 [thread overview]
Message-ID: <4E357285.8080708@grandegger.com> (raw)
In-Reply-To: <4E35309E.4000202@embedded-sol.com>
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.
Wolfgang.
next prev parent reply other threads:[~2011-07-31 15:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-31 10:38 GPIO IRQ on P1022 Felix Radensky
2011-07-31 13:59 ` Tabi Timur-B04825
2011-07-31 14:56 ` Felix Radensky
2011-08-02 10:47 ` Felix Radensky
2011-07-31 15:19 ` Wolfgang Grandegger [this message]
2011-07-31 15:51 ` Felix Radensky
2011-07-31 17:49 ` Wolfgang Grandegger
2011-07-31 19:28 ` Felix Radensky
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