cx25821-gpio.c

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/*
 *  Driver for the Conexant CX25821 PCIe bridge
 *
 *  Copyright (C) 2009 Conexant Systems Inc.
 *  Authors  <[email protected]>, <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "cx25821.h"

/********************* GPIO stuffs *********************/
void cx25821_set_gpiopin_direction(struct cx25821_dev *dev,
                   int pin_number, int pin_logic_value)
{
    int bit = pin_number;
    u32 gpio_oe_reg = GPIO_LO_OE;
    u32 gpio_register = 0;
    u32 value = 0;

    /* Check for valid pinNumber */
    if (pin_number >= 47)
        return;

    if (pin_number > 31) {
        bit = pin_number - 31;
        gpio_oe_reg = GPIO_HI_OE;
    }
    /* Here we will make sure that the GPIOs 0 and 1 are output. keep the
     * rest as is */
    gpio_register = cx_read(gpio_oe_reg);

    if (pin_logic_value == 1)
        value = gpio_register | Set_GPIO_Bit(bit);
    else
        value = gpio_register & Clear_GPIO_Bit(bit);

    cx_write(gpio_oe_reg, value);
}
EXPORT_SYMBOL(cx25821_set_gpiopin_direction);

static void cx25821_set_gpiopin_logicvalue(struct cx25821_dev *dev,
                       int pin_number, int pin_logic_value)
{
    int bit = pin_number;
    u32 gpio_reg = GPIO_LO;
    u32 value = 0;

    /* Check for valid pinNumber */
    if (pin_number >= 47)
        return;

    /* change to output direction */
    cx25821_set_gpiopin_direction(dev, pin_number, 0);

    if (pin_number > 31) {
        bit = pin_number - 31;
        gpio_reg = GPIO_HI;
    }

    value = cx_read(gpio_reg);

    if (pin_logic_value == 0)
        value &= Clear_GPIO_Bit(bit);
    else
        value |= Set_GPIO_Bit(bit);

    cx_write(gpio_reg, value);
}

void cx25821_gpio_init(struct cx25821_dev *dev)
{
    if (dev == NULL)
        return;

    switch (dev->board) {
    case CX25821_BOARD_CONEXANT_ATHENA10:
    default:
        /* set GPIO 5 to select the path for Medusa/Athena */
        cx25821_set_gpiopin_logicvalue(dev, 5, 1);
        mdelay(20);
        break;
    }

}