[ts-7000] IRQ 7/40 disabling

["Clark" <>]

Trying to get a 1PPS GPS interrupt going on IRQ7/40 for TS7260!
We read all the notes in EP9301 User's Guide, in particular
the bottom of page 525 seems important.  We have been inspecting
the driver's results using a user-space mapping of /dev/mem,
but now we have simplified, we use the /dev/mem technique sans
the driver and the interrupt keeps getting disabled!?

Simple user space code:

    int val = 0x00000004, cuz;
    int fd = open("/dev/mem", O_RDWR|O_SYNC);
    gpio_ptr = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 
0x80840000);

    PFDR = (unsigned int *)(gpio_ptr + 0x30);     // port f data register
    PFDDR = (unsigned int *)(gpio_ptr + 0x34);    // port f direction register
    GPIOFIntEn = (unsigned int *)(gpio_ptr + 0x58);
    GPIOFIntType1 = (unsigned int *)(gpio_ptr + 0x4C);
    GPIOFIntType2 = (unsigned int *)(gpio_ptr + 0x50);
    GPIOFDB = (unsigned int *)(gpio_ptr + 0x64);  // debounce on port f

    /* Exactly as given on pp 525 */
    cuz = *GPIOFIntEn; cuz &= ~val; *GPIOFIntEn = cuz;
    cuz = *PFDDR; cuz &= ~val; *PFDDR = cuz;
    cuz = *GPIOFIntType1; cuz  |= val; *GPIOFIntType1 = cuz;
    cuz = *GPIOFIntType2; cuz |= val; *GPIOFIntType2 = cuz;
    cuz = *GPIOFIntEn; cuz |= val; *GPIOFIntEn = cuz;

    printf( "Aft: PFDR=0x%x PFDDR=0x%x GPIOFDB=0x%x GPIOFIntEn=0x%x 
GPIOFIntType1=0x%x GPIOFIntType2=0x%x\n", *PFDR, *PFDDR, *GPIOFDB, *GPIOFIntEn, 
*GPIOFIntType1, *GPIOFIntType2 );
___________________________
    
The first time it runs, we achieve nada:

Aft: PFDR=0xff PFDDR=0x0 GPIOFDB=0x0 GPIOFIntEn=0x0 GPIOFIntType1=0x0 
GPIOFIntType2=0x0

But the second time it runs immediately after, we get:

Aft: PFDR=0xff PFDDR=0x0 GPIOFDB=0x0 GPIOFIntEn=0x4 GPIOFIntType1=0x4 
GPIOFIntType2=0x4

Now this looks good! But when we run the /dev/mem reader immediately following 
that, we get: 

PFDR=0xff PFDDR=0x0 GPIOFDB=0x0 GPIOFIntEn=0x0 GPIOFIntType1=0x0 
GPIOFIntType2=0x0

Disabled by what?  This is Matthieu's stock 2.6.29.1, lsmod: 8250, tsscard, 
rtc_ep93xx, the rest the usual suspects.  

Any ideas?  Thanks



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