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/*
* Driver for the Conexant CX25821 PCIe bridge
*
* Copyright (C) 2009 Conexant Systems Inc.
* Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
*
* 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 <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);
mdelay(20);
break;
}
}
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