96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
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/*
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* Driver for the Conexant CX25821 PCIe bridge
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*
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* Copyright (C) 2009 Conexant Systems Inc.
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* Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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*
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include "cx25821.h"
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/********************* GPIO stuffs *********************/
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void cx25821_set_gpiopin_direction(struct cx25821_dev *dev,
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int pin_number, int pin_logic_value)
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{
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int bit = pin_number;
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u32 gpio_oe_reg = GPIO_LO_OE;
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u32 gpio_register = 0;
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u32 value = 0;
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/* Check for valid pinNumber */
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if (pin_number >= 47)
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return;
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if (pin_number > 31) {
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bit = pin_number - 31;
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gpio_oe_reg = GPIO_HI_OE;
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}
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/* Here we will make sure that the GPIOs 0 and 1 are output. keep the
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* rest as is */
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gpio_register = cx_read(gpio_oe_reg);
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if (pin_logic_value == 1)
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value = gpio_register | Set_GPIO_Bit(bit);
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else
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value = gpio_register & Clear_GPIO_Bit(bit);
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cx_write(gpio_oe_reg, value);
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}
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EXPORT_SYMBOL(cx25821_set_gpiopin_direction);
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static void cx25821_set_gpiopin_logicvalue(struct cx25821_dev *dev,
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int pin_number, int pin_logic_value)
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{
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int bit = pin_number;
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u32 gpio_reg = GPIO_LO;
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u32 value = 0;
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/* Check for valid pinNumber */
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if (pin_number >= 47)
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return;
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/* change to output direction */
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cx25821_set_gpiopin_direction(dev, pin_number, 0);
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if (pin_number > 31) {
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bit = pin_number - 31;
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gpio_reg = GPIO_HI;
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}
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value = cx_read(gpio_reg);
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if (pin_logic_value == 0)
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value &= Clear_GPIO_Bit(bit);
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else
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value |= Set_GPIO_Bit(bit);
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cx_write(gpio_reg, value);
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}
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void cx25821_gpio_init(struct cx25821_dev *dev)
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{
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if (dev == NULL)
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return;
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switch (dev->board) {
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case CX25821_BOARD_CONEXANT_ATHENA10:
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default:
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/* set GPIO 5 to select the path for Medusa/Athena */
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cx25821_set_gpiopin_logicvalue(dev, 5, 1);
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msleep(20);
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break;
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}
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}
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