2 * Driver for the Conexant CX25821 PCIe bridge
4 * Copyright (C) 2009 Conexant Systems Inc.
5 * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include <linux/module.h>
22 /********************* GPIO stuffs *********************/
23 void cx25821_set_gpiopin_direction(struct cx25821_dev *dev,
24 int pin_number, int pin_logic_value)
27 u32 gpio_oe_reg = GPIO_LO_OE;
28 u32 gpio_register = 0;
31 /* Check for valid pinNumber */
35 if (pin_number > 31) {
36 bit = pin_number - 31;
37 gpio_oe_reg = GPIO_HI_OE;
39 /* Here we will make sure that the GPIOs 0 and 1 are output. keep the
41 gpio_register = cx_read(gpio_oe_reg);
43 if (pin_logic_value == 1)
44 value = gpio_register | Set_GPIO_Bit(bit);
46 value = gpio_register & Clear_GPIO_Bit(bit);
48 cx_write(gpio_oe_reg, value);
50 EXPORT_SYMBOL(cx25821_set_gpiopin_direction);
52 static void cx25821_set_gpiopin_logicvalue(struct cx25821_dev *dev,
53 int pin_number, int pin_logic_value)
56 u32 gpio_reg = GPIO_LO;
59 /* Check for valid pinNumber */
63 /* change to output direction */
64 cx25821_set_gpiopin_direction(dev, pin_number, 0);
66 if (pin_number > 31) {
67 bit = pin_number - 31;
71 value = cx_read(gpio_reg);
73 if (pin_logic_value == 0)
74 value &= Clear_GPIO_Bit(bit);
76 value |= Set_GPIO_Bit(bit);
78 cx_write(gpio_reg, value);
81 void cx25821_gpio_init(struct cx25821_dev *dev)
87 case CX25821_BOARD_CONEXANT_ATHENA10:
89 /* set GPIO 5 to select the path for Medusa/Athena */
90 cx25821_set_gpiopin_logicvalue(dev, 5, 1);