/* gpioinit.c - gpioinit */

#include 

struct  gpiocblk        gpiotab[NGPIO];

/*------------------------------------------------------------------------
 *  gpioinit  -  Initialize settings for a gpio device
 *------------------------------------------------------------------------
 */
devcall gpioinit(
          struct dentry *devptr         /* Entry in device switch table */
        )
{
        struct gpio_csreg *csrptr;      /* Pointer ot GPIO CSRs         */
        struct gpiocblk *gpioptr;       /* Pointer ot GPIO Control block*/
        uint32 *fclkreg;                /* FCLK Register for debounce   */

        csrptr = (struct gpio_csreg *)(devptr->dvcsr);
        gpioptr = &gpiotab[devptr->dvminor];

        /* Get the FCLK Register for the corresponding GPIO module */

        if(csrptr == GPIO1_BASE)        {
                fclkreg = PRCM_FCLK_GPIO1;
        } else if(csrptr == GPIO2_BASE) {
                fclkreg = PRCM_FCLK_GPIO2;
        } else if(csrptr == GPIO3_BASE) {
                fclkreg = PRCM_FCLK_GPIO3;
        } else {
                /* GPIO0 FCLK is ON by default */
                fclkreg = NULL;
        }

        /* Initialize register values */

        csrptr->sysconfig = 0x0;
        
        /* Disable output for all pins */

        csrptr->oe = 0xFFFFFFFF;

        /* Clear all pending interrupts */

        csrptr->irqstatus0 = 0xFFFFFFFF;
        csrptr->irqstatus1 = 0xFFFFFFFF;

        /* Disable all interrupts */

        csrptr->irqclear0 = 0xFFFFFFFF;
        csrptr->irqclear1 = 0xFFFFFFFF;
        
        /* Clear all pins */

        csrptr->clear_data = 0xFFFFFFFF;
        
        /* Clear wakeup settings */

        csrptr->irqwaken0 = 0x0;
        csrptr->irqwaken1 = 0x0;

        /* Clear all interrupt trigger settings */

        csrptr->rising  = 0x0;
        csrptr->falling = 0x0;
        csrptr->level0  = 0x0;
        csrptr->level1  = 0x0;

        /* Disable debouncing */

        csrptr->deb_ena = 0x0;

        /* Setup debouncing clock */

        if(fclkreg != NULL)     {
                *fclkreg |= PRCM_FCLK_BIT;
        }

        /* Interrupt A */

        set_evec( devptr->dvirq, (uint32)devptr->dvintr );

        /* Interrupt B is the next interrupt line */

        set_evec( (devptr->dvirq)+1, (uint32)devptr->dvintr );

        gpioptr->gphookfn = NULL;

        return OK;
}