gpioinit.c File Reference

#include <xinu.h>

Include dependency graph for gpioinit.c:

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Functions
devcall	gpioinit (struct dentry *devptr)

Variables
struct gpiocblk	gpiotab [NGPIO]

Function Documentation

gpioinit()

devcall gpioinit

(

struct dentry *

devptr

)

Definition at line 11 of file gpioinit.c.

References gpio_csreg::clear_data, gpio_csreg::deb_ena, dentry::dvcsr, dentry::dvintr, dentry::dvirq, dentry::dvminor, gpio_csreg::falling, gpiocblk::gphookfn, GPIO1_BASE, GPIO2_BASE, GPIO3_BASE, gpiotab, gpio_csreg::irqclear0, gpio_csreg::irqclear1, gpio_csreg::irqstatus0, gpio_csreg::irqstatus1, gpio_csreg::irqwaken0, gpio_csreg::irqwaken1, gpio_csreg::level0, gpio_csreg::level1, NULL, gpio_csreg::oe, OK, PRCM_FCLK_BIT, PRCM_FCLK_GPIO1, PRCM_FCLK_GPIO2, PRCM_FCLK_GPIO3, gpio_csreg::rising, set_evec(), and gpio_csreg::sysconfig.

{
    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;
}

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Variable Documentation

gpiotab

struct gpiocblk gpiotab[NGPIO]

Definition at line 5 of file gpioinit.c.

Referenced by gpiocontrol(), gpiohandler(), and gpioinit().