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/* * Driver for the Conexant CX25821 PCIe bridge * * Copyright (C) 2009 Conexant Systems Inc. * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * * GNU General Public License for more details. */ #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; } } |