86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
// 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;
|
|
}
|
|
|
|
}
|