Help, how do I debug timer3 Interrupts?  My driver was working and then 
interrupts
stopped coming (most likely blocked).  I have a driver that is very 
similar to
     linuxppc_2_4_devel/drivers/char/pp01_ad64.c
I have attached the complete driver (et.c)

/ # insmod et
ET Display Driver v0.1 loaded ET_TIN irq 16

et_init 00 intr->per_mask  1bfffc00
et_init 10 intr->ctrl      00c01001
et_init 14 intr->main_mask 00010e00
et_init 24 intr->enc_stat  00000001
et_init 28 intr->crit_stat 00000000
et_init 2c intr->main_stat 00002000
et_init 30 intr->per_stat  00000000
et_init 38 intr->per_error 00000000

/ # cat /proc/interrupts
           CPU0
 16:          0  MPC5xxx Edge      et Trubine
 23:       1049  MPC5xxx Edge      eth_xmit
 24:       2468  MPC5xxx Edge      eth_recv
 39:         51  MPC5xxx Edge      serial
 40:          0  MPC5xxx Edge      serial
 43:         69  MPC5xxx Edge      eth_err
BAD:          0

with a pulse train on timer3 input "et_interrupt" no longer gets
called.

code snippets
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#define ET_TIN         3   // Turbine PULSE IN

static void et_interrupt (int irq, void *dev_id, struct pt_regs * regs)
{
    int port = ET_IRQ_TO_PORT(irq);
    unsigned long stat;

    printk(KERN_INFO "et_interrupt IRQ %d port %d main_stat %x gpt.sr %x 
\n",
                        irq, port, intr->main_status, gpt[port].sr );

    if( port == ET_TIN ) {
        // Clear pending interrupt
        stat = in_be32(&gpt[port].sr) & 0xffff;
        out_be32(&gpt[port].sr,  MPC5xxx_GPT_SR_CAPT);
        printk(KERN_INFO "et_int irq=%d port=%d stat %0lx \n", irq, 
port, stat);
        // wake_up_interruptible(&et_wait);
    } else {
        printk(KERN_ERR ET_MSG "Unexpected IRQ %d received", irq);
    }
    spin_lock (&et_lock);
    turbine_per = in_be32(&gpt[port].sr) >> 16;
    spin_unlock (&et_lock);
}


static int __init et_init (void)
....
if (request_irq(ET_PORT_TO_IRQ(ET_TIN), et_interrupt, 0, "et Trubine", 
NULL)) {
            printk(KERN_ERR ET_MSG "couldn't register interrupts\n");
            goto abort_remove_proc;
    }
out_be32(&gpt[ET_TIN].cir, (   66<<16) | 1 );  /* prescale(16), 
period(16)  */
out_be32(&gpt[ET_TIN].emsr,
        MPC5xxx_GPT_EMSR_INP_CAPTURE
      | MPC5xxx_GPT_EMSR_ICT_FALLING
      | MPC5xxx_GPT_EMSR_INT_ENABLE);
...
printk(KERN_INFO "ET Display Driver v%s loaded ET_TIN irq %d\n",
        ET_VERSION, ET_PORT_TO_IRQ(ET_TIN) );

    //broke with or without the following
    intr->main_mask &= ~(0x000000ff);   /* enable timer ints */

    printk(KERN_INFO "et_init 00 intr->per_mask  %08x\n", intr->per_mask);
    printk(KERN_INFO "et_init 10 intr->ctrl      %08x\n", intr->ctrl);
    printk(KERN_INFO "et_init 14 intr->main_mask %08x\n", intr->main_mask);
    printk(KERN_INFO "et_init 24 intr->enc_stat  %08x\n", intr->enc_status);
    printk(KERN_INFO "et_init 28 intr->crit_stat %08x\n", 
intr->crit_status);
    printk(KERN_INFO "et_init 2c intr->main_stat %08x\n", 
intr->main_status);
    printk(KERN_INFO "et_init 30 intr->per_stat  %08x\n", intr->per_status);
    printk(KERN_INFO "et_init 38 intr->per_error %08x\n", intr->per_error);

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thanks in advance for any help,

Frank Bennett

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