// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for the Conexant CX25821 PCIe bridge
 *
 *  Copyright (C) 2009 Conexant Systems Inc.
 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
 */

#include <linux/module.h>
#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);
                msleep(20);
                break;
        }

}