text: /*
   * Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *  * Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *  * Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *  * Neither the name of Google, Inc. nor the names of its contributors
   *    may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <arch/io.h>
  #include <gpio.h>
  #include <soc/iomap.h>
  
  /*******************************************************
  Function description: check for invalid GPIO #
  Arguments :
  gpio_t gpio - Gpio number
  
  Return : GPIO Valid(0)/Invalid(1)
  *******************************************************/
  
  static inline int gpio_not_valid(gpio_t gpio)
  {
  	return (gpio > GPIO_MAX_NUM);
  }
  
  
  /*******************************************************
  Function description: configure GPIO functinality
  Arguments :
  gpio_t gpio - Gpio number
  unsigned func - Functionality number
  unsigned pull - pull up/down, no pull range(0-3)
  unsigned drvstr - range (0 - 7)-> (2- 16)MA steps of 2
  unsigned enable - 0 Disable, 1 - Enable.
  
  Return : None
  *******************************************************/
  
  
  void gpio_tlmm_config_set(gpio_t gpio, unsigned func,
  			  unsigned pull, unsigned drvstr,
  			  unsigned enable)
  {
          unsigned val = 0;
  
  	if (gpio_not_valid(gpio))
  		return;
  
          val |= (pull & GPIO_CFG_PULL_MASK) << GPIO_CFG_PULL_SHIFT;
          val |= (func & GPIO_CFG_FUNC_MASK) << GPIO_CFG_FUNC_SHIFT;
          val |= (drvstr & GPIO_CFG_DRV_MASK) << GPIO_CFG_DRV_SHIFT;
          val |= (enable & GPIO_CFG_OE_MASK) << GPIO_CFG_OE_SHIFT;
  
          write32(GPIO_CONFIG_ADDR(gpio), val);
  }
  
  /*******************************************************
  Function description: Get GPIO configuration
  Arguments :
  gpio_t gpio - Gpio number
  unsigned *func - Functionality number
  unsigned *pull - pull up/down, no pull range(0-3)
  unsigned *drvstr - range (0 - 7)-> (2- 16)MA steps of 2
  unsigned *enable - 0 - Disable, 1- Enable.
  
  Return : None
  *******************************************************/
  
  
  void gpio_tlmm_config_get(gpio_t gpio, unsigned *func,
  			  unsigned *pull, unsigned *drvstr,
  			  unsigned *enable)
  {
          unsigned val;
          void *addr = GPIO_CONFIG_ADDR(gpio);
  
  	if (gpio_not_valid(gpio))
  		return;
  
  	val = read32(addr);
  
  	*pull = (val >> GPIO_CFG_PULL_SHIFT) & GPIO_CFG_PULL_MASK;
  	*func = (val >> GPIO_CFG_FUNC_SHIFT) & GPIO_CFG_FUNC_MASK;
  	*drvstr = (val >> GPIO_CFG_DRV_SHIFT) & GPIO_CFG_DRV_MASK;
  	*enable = (val >> GPIO_CFG_OE_SHIFT) & GPIO_CFG_OE_MASK;
  }
  
  /*******************************************************
  Function description: get GPIO IO functinality details
  Arguments :
  gpio_t gpio - Gpio number
  unsigned *in - Value of GPIO input
  unsigned *out - Value of GPIO output
  
  Return : None
  *******************************************************/
  int gpio_get(gpio_t gpio)
  {
  	if (gpio_not_valid(gpio))
  		return -1;
  
  
  	return (read32(GPIO_IN_OUT_ADDR(gpio)) >> GPIO_IO_IN_SHIFT) &
  		GPIO_IO_IN_MASK;
  }
  
  void gpio_set(gpio_t gpio, int value)
  {
  	if (gpio_not_valid(gpio))
  		return;
  
  	write32(GPIO_IN_OUT_ADDR(gpio), (value & 1) << GPIO_IO_OUT_SHIFT);
  }
  
  void gpio_input_pulldown(gpio_t gpio)
  {
  	gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE,
  			     GPIO_PULL_DOWN, GPIO_2MA, GPIO_DISABLE);
  }
  
  void gpio_input_pullup(gpio_t gpio)
  {
  	gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE,
  			     GPIO_PULL_UP, GPIO_2MA, GPIO_DISABLE);
  }
  
  void gpio_input(gpio_t gpio)
  {
  	gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE,
  			     GPIO_NO_PULL, GPIO_2MA, GPIO_DISABLE);
  }
  