LXR linux/drivers/staging/cx25821/cx25821-gpio.c

   1/*
   2 *  Driver for the Conexant CX25821 PCIe bridge
   3 *
   4 *  Copyright (C) 2009 Conexant Systems Inc.
   5 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
   6 *
   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.
  11 *
  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
  15 *
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to the Free Software
  20 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23#include "cx25821.h"
  24
  25/********************* GPIO stuffs *********************/
  26void cx25821_set_gpiopin_direction(struct cx25821_dev *dev,
  27                                   int pin_number, int pin_logic_value)
  28{
  29        int bit = pin_number;
  30        u32 gpio_oe_reg = GPIO_LO_OE;
  31        u32 gpio_register = 0;
  32        u32 value = 0;
  33
  34        // Check for valid pinNumber
  35        if (pin_number >= 47)
  36                return;
  37
  38        if (pin_number > 31) {
  39                bit = pin_number - 31;
  40                gpio_oe_reg = GPIO_HI_OE;
  41        }
  42        // Here we will make sure that the GPIOs 0 and 1 are output. keep the rest as is
  43        gpio_register = cx_read(gpio_oe_reg);
  44
  45        if (pin_logic_value == 1) {
  46                value = gpio_register | Set_GPIO_Bit(bit);
  47        } else {
  48                value = gpio_register & Clear_GPIO_Bit(bit);
  49        }
  50
  51        cx_write(gpio_oe_reg, value);
  52}
  53
  54static void cx25821_set_gpiopin_logicvalue(struct cx25821_dev *dev,
  55                                           int pin_number, int pin_logic_value)
  56{
  57        int bit = pin_number;
  58        u32 gpio_reg = GPIO_LO;
  59        u32 value = 0;
  60
  61        // Check for valid pinNumber
  62        if (pin_number >= 47)
  63                return;
  64
  65        cx25821_set_gpiopin_direction(dev, pin_number, 0);      // change to output direction
  66
  67        if (pin_number > 31) {
  68                bit = pin_number - 31;
  69                gpio_reg = GPIO_HI;
  70        }
  71
  72        value = cx_read(gpio_reg);
  73
  74        if (pin_logic_value == 0) {
  75                value &= Clear_GPIO_Bit(bit);
  76        } else {
  77                value |= Set_GPIO_Bit(bit);
  78        }
  79
  80        cx_write(gpio_reg, value);
  81}
  82
  83void cx25821_gpio_init(struct cx25821_dev *dev)
  84{
  85        if (dev == NULL) {
  86                return;
  87        }
  88
  89        switch (dev->board) {
  90        case CX25821_BOARD_CONEXANT_ATHENA10:
  91        default:
  92                //set GPIO 5 to select the path for Medusa/Athena
  93                cx25821_set_gpiopin_logicvalue(dev, 5, 1);
  94                mdelay(20);
  95                break;
  96        }
  97
  98}
  99