Joerg Mohre wrote:
> Hi all,
>
> i am using a MPC52000 and try to handle external interrupts (IRQ1) with
> linux kernel 2.6.32 and Xenomai 2.5.5.2.
> I use the POSIX skin functions to setup interrupt and wait for interrupt
> in user-space.
>
> First for testing, i wrote a kernel module to setup and handle the
> interrupts.
> This worked well.
>
> Now it tried to do the same from user-space with the posix functions.
> But unfortunately this wasn't successful.
>
> I have to load the kernel module before i use my user-space application
> (see code).
> Otherwise pthread_intr_control_np will fail with error -1 and errono = -19.
>
>
> static int mpc5200_intr_setup(void)
> {
> int iret = 0;
> int err = 0;
> pthread_attr_t ThreadAttribute;
> struct sched_param sched_param;
> unsigned char byPriority;
>
> unsigned int i = 0;
>
> byPriority = 90;
> sched_param.sched_priority = byPriority;
> memset (&sched_param, 0, sizeof (sched_param));
>
> if ( (pRegsIntCtrl = (int_ctrl_regs*)ioremap( MBAR_VALUE +
> MBAR_INT_CTRL, REMAP_SIZE )) == NULL) {
> printf("ioremap failed for MBAR_INT_CTRL\n");
> return -1;
> }
>
> //pRegsIntCtrl->irqctl = 0x00201401; //bit 10,21 => 1: IRQ1 rising
> edge active; enable IRQ1
> pRegsIntCtrl->irqctl = 0x00201001; //bit 10 => 1: IRQ1 rising edge
> active; disbable IRQ1
>
> if (pthread_intr_attach_np (&irq_object, 65, 0)) {
> printf("Interrupt source not found!\n");
> return -1;
> }
> else {
> printf("Interrupt source found!\n");
> }
>
> printf("pregs->irqctl = %08X\n",pRegsIntCtrl->irqctl);
>
> sleep(5);
>
> printf("%i\n", i+=1);
> pthread_attr_init( &ThreadAttribute);
> printf("%i\n", i+=1);
> if (pthread_attr_setstacksize(&ThreadAttribute,0x80000)) {
> printf("Failed to set stack size\n");
> return -1;
> }
> printf("%i\n", i+=1);
> if (pthread_create( &Thread, &ThreadAttribute,
> cyclic_interrupt_receiver, NULL)) {
> printf("Failed to create thread\n");
> return -1;
> }
> printf("%i\n", i+=1);
> if (pthread_setschedparam (Thread,SCHED_FIFO,&sched_param)) {
> printf("Failed to set scheduling parameter\n");
> return -1;
> }
> printf("%i\n", i+=1);
> iret = pthread_intr_control_np (irq_object, PTHREAD_IENABLE);
> if (iret)
> {
> err = errno;
> printf("Failed to enable interrupt (%i, errno = %i)\n",
> iret, err);
> return -1;
> }
>
> printf("%i\n", i+=1);
> return iret;
> }
The way you indented it, this code is unreadable.
>
> If i enable IRQ1 with
> //pRegsIntCtrl->irqctl = 0x00201401; //bit 10,21 => 1: IRQ1 rising edge
> active; enable IRQ1
> the CPU seams to be blocked.
>
> I searched the internet but i couldn't find any help for handling
> external interrupts with posix skin in user-space.
>
> Is it necessary to request an irq with native functions from kernel module?
>
> I would expect that all (request, enable setup type ....) is done by the
> posix functions.
It should be done by the call to pthread_intr_attach_np. But do not take
my word for it, have a look at the code.
Anyway, handling interrupts in user-space is hard, handling them in an
RTDM driver is what we recommend.
--
Gilles.
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