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 19 #include <linux/module.h> 20 #include "cx25821.h" 21 22 /********************* GPIO stuffs *********************/ 23 void cx25821_set_gpiopin_direction(struct cx25821_dev *dev, 24 int pin_number, int pin_logic_value) 25 { 26 int bit = pin_number; 27 u32 gpio_oe_reg = GPIO_LO_OE; 28 u32 gpio_register = 0; 29 u32 value = 0; 30 31 /* Check for valid pinNumber */ 32 if (pin_number >= 47) 33 return; 34 35 if (pin_number > 31) { 36 bit = pin_number - 31; 37 gpio_oe_reg = GPIO_HI_OE; 38 } 39 /* Here we will make sure that the GPIOs 0 and 1 are output. keep the 40 * rest as is */ 41 gpio_register = cx_read(gpio_oe_reg); 42 43 if (pin_logic_value == 1) 44 value = gpio_register | Set_GPIO_Bit(bit); 45 else 46 value = gpio_register & Clear_GPIO_Bit(bit); 47 48 cx_write(gpio_oe_reg, value); 49 } 50 EXPORT_SYMBOL(cx25821_set_gpiopin_direction); 51 52 static void cx25821_set_gpiopin_logicvalue(struct cx25821_dev *dev, 53 int pin_number, int pin_logic_value) 54 { 55 int bit = pin_number; 56 u32 gpio_reg = GPIO_LO; 57 u32 value = 0; 58 59 /* Check for valid pinNumber */ 60 if (pin_number >= 47) 61 return; 62 63 /* change to output direction */ 64 cx25821_set_gpiopin_direction(dev, pin_number, 0); 65 66 if (pin_number > 31) { 67 bit = pin_number - 31; 68 gpio_reg = GPIO_HI; 69 } 70 71 value = cx_read(gpio_reg); 72 73 if (pin_logic_value == 0) 74 value &= Clear_GPIO_Bit(bit); 75 else 76 value |= Set_GPIO_Bit(bit); 77 78 cx_write(gpio_reg, value); 79 } 80 81 void cx25821_gpio_init(struct cx25821_dev *dev) 82 { 83 if (dev == NULL) 84 return; 85 86 switch (dev->board) { 87 case CX25821_BOARD_CONEXANT_ATHENA10: 88 default: 89 /* set GPIO 5 to select the path for Medusa/Athena */ 90 cx25821_set_gpiopin_logicvalue(dev, 5, 1); 91 msleep(20); 92 break; 93 } 94 95 } 96