PWM - IRQ - Handler not get called

karthikeyanraju — Wed, 06 Jun 2018 13:43:24 GMT

My Driver Code :

/*
* ISR for PWM Counter
*/
static irqreturn_t pwm_cnt_interrupt(int irq, void *data)
{
printk("==> %s\r\n", __func__);

        //ecap_configure(globle_dev);
        //ecap_intr_event(globle_dev);
   return IRQ_HANDLED;
}

static int ecap_cnt_probe(struct platform_device *pdev)
{
     printk("KARTHIK ==> %s\r\n", __func__);
   struct device_node *np = pdev->dev.of_node;
   int ret, ecapirq;
   struct resource *r;
   struct clk *clk;
   struct ecap_device *pc;

   pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
   if (!pc)
       return -ENOMEM;

   clk = devm_clk_get(&pdev->dev, "fck");
   if (IS_ERR(clk)) {
       if (of_device_is_compatible(np, "ti,counter-ecap")) {
           dev_warn(&pdev->dev, "Binding is obsolete.\n");
           clk = devm_clk_get(pdev->dev.parent, "fck");
       }
   }

   if (IS_ERR(clk)) {
       dev_err(&pdev->dev, "failed to get clock\n");
       return PTR_ERR(clk);
   }

   pc->clk_rate = clk_get_rate(clk);
   if (!pc->clk_rate) {
       dev_err(&pdev->dev, "failed to get clock rate\n");
       return -EINVAL;
   }

r = platform_get_resource(pdev, IORESOURCE_MEM, 0);

   pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);
   if (IS_ERR(pc->mmio_base))
       return PTR_ERR(pc->mmio_base);

        globle_dev = pc;

        /* Get PWM IRQ number */
        ecapirq = platform_get_irq(pdev, 0);
        if (ecapirq < 0) {
            printk(KERN_ERR "Could not get IRQ");
            return -EINVAL;
        }
        printk(KERN_DEBUG "irq = %d\n", ecapirq);

oreore_dentry = debugfs_create_file("counter", 0666, NULL, &value, &fops);

   if(request_irq(ecapirq, pwm_cnt_interrupt, IRQF_SHARED,
                        "counter", (void *)&counter)) {
                printk(KERN_ERR "pwm counter: Can't allocate irq %d\n",
               ecapirq);
                return -EBUSY;
        }

INIT_DELAYED_WORK(&pc->work, capture_polling);
mutex_init(&pc->counter);

platform_set_drvdata(pdev, pc);
printk("TP7 ==> %s\r\n", __func__);

return 0;
}

My Interrupt got registed in /proc/interrupts But, Its not get triggered.

Kernel Log:

#cat /proc/interrupts

190:          1      INTC 37 Level     SGX ISR
191:          0      INTC   7 Level     txsky button
192:          0      INTC 31 Level     counter
194:          8      INTC 18 Level     musb-hdrc.0
195:          8      INTC 19 Level     musb-hdrc.1

I have connected UART with my pwm interrupt pin. I m sending data using uart port. my irq handler is not get called at that time.

Can anyone help me resolve this issue.

Re: PWM - IRQ - Handler not get called

igorpadykov — Wed, 06 Jun 2018 23:06:56 GMT

Hi Karthikeyan

issue may be debugged with AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors
https://www.nxp.com/docs/en/application-note/AN4553.pdf

examples of gpt capture can be found in sdk (please check zip on https://community.nxp.com/thread/432859 )

Best regards
igor
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Re: PWM - IRQ - Handler not get called

karthikeyanraju — Thu, 07 Jun 2018 06:45:34 GMT

Hi Igor,

I think this is not the one i m looking for.

I just want the guidance for PWM IRQ interrupt call.

I have verified with some irq request calls, i didnt find any difference.

Is anything i need to follow specifically for the PWM ?

Please provide the guidance based on this code.

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