text: /************************************************************************************
   * configs/mikroe_stm32f4/src/up_extmem.c
   * arch/arm/src/board/up_extmem.c
   *
   *   Copyright (C) 2012-2013 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. 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.
   * 3. Neither the name NuttX 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.
   *
   ************************************************************************************/
  
  /************************************************************************************
   * Included Files
   ************************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <assert.h>
  #include <debug.h>
  
  #include <arch/board/board.h>
  
  #include "chip.h"
  #include "up_arch.h"
  
  #include "stm32_fsmc.h"
  #include "stm32_gpio.h"
  #include "stm32.h"
  #include "mikroe-stm32f4-internal.h"
  
  /************************************************************************************
   * Pre-processor Definitions
   ************************************************************************************/
  
  #ifndef CONFIG_STM32_FSMC
  #  warning "FSMC is not enabled"
  #endif
  
  #if STM32_NGPIO_PORTS < 6
  #  error "Required GPIO ports not enabled"
  #endif
  
  #define STM32_FSMC_NADDRCONFIGS 26
  #define STM32_FSMC_NDATACONFIGS 16
  
  /************************************************************************************
   * Public Data
   ************************************************************************************/
  
  /* GPIO configurations common to most external memories */
  
  static const uint32_t g_addressconfig[STM32_FSMC_NADDRCONFIGS] =
  {
    GPIO_FSMC_A0,  GPIO_FSMC_A1 , GPIO_FSMC_A2,  GPIO_FSMC_A3,  GPIO_FSMC_A4 , GPIO_FSMC_A5,
    GPIO_FSMC_A6,  GPIO_FSMC_A7,  GPIO_FSMC_A8,  GPIO_FSMC_A9,  GPIO_FSMC_A10, GPIO_FSMC_A11,
    GPIO_FSMC_A12, GPIO_FSMC_A13, GPIO_FSMC_A14, GPIO_FSMC_A15, GPIO_FSMC_A16, GPIO_FSMC_A17,
    GPIO_FSMC_A18, GPIO_FSMC_A19, GPIO_FSMC_A20, GPIO_FSMC_A21, GPIO_FSMC_A22, GPIO_FSMC_A23,
    GPIO_FSMC_A24, GPIO_FSMC_A25
  };
  
  static const uint32_t g_dataconfig[STM32_FSMC_NDATACONFIGS] =
  {
    GPIO_FSMC_D0,  GPIO_FSMC_D1 , GPIO_FSMC_D2,  GPIO_FSMC_D3,  GPIO_FSMC_D4 , GPIO_FSMC_D5,
    GPIO_FSMC_D6,  GPIO_FSMC_D7,  GPIO_FSMC_D8,  GPIO_FSMC_D9,  GPIO_FSMC_D10, GPIO_FSMC_D11,
    GPIO_FSMC_D12, GPIO_FSMC_D13, GPIO_FSMC_D14, GPIO_FSMC_D15
  };
  
  /************************************************************************************
   * Private Data
   ************************************************************************************/
  
  /************************************************************************************
   * Private Functions
   ************************************************************************************/
  
  /************************************************************************************
   * Public Functions
   ************************************************************************************/
  
  /************************************************************************************
   * Name: stm32_extmemgpios
   *
   * Description:
   *   Initialize GPIOs for external memory usage
   *
   ************************************************************************************/
  
  void stm32_extmemgpios(const uint32_t *gpios, int ngpios)
  {
    int i;
  
    /* Configure GPIOs */
  
    for (i = 0; i < ngpios; i++)
      {
        stm32_configgpio(gpios[i]);
      }
  }
  
  /************************************************************************************
   * Name: stm32_extmemaddr
   *
   * Description:
   *   Initialize adress line GPIOs for external memory access
   *
   ************************************************************************************/
  
  void stm32_extmemaddr(int naddrs)
  {
    stm32_extmemgpios(g_addressconfig, naddrs);
  }
  
  /************************************************************************************
   * Name: stm32_extmemdata
   *
   * Description:
   *   Initialize data line GPIOs for external memory access
   *
   ************************************************************************************/
  
  void stm32_extmemdata(int ndata)
  {
    stm32_extmemgpios(g_dataconfig, ndata);
  }
  
  /************************************************************************************
   * Name: stm32_enablefsmc
   *
   * Description:
   *  enable clocking to the FSMC module
   *
   ************************************************************************************/
  
  void stm32_enablefsmc(void)
  {
    uint32_t regval;
  
    /* Enable AHB clocking to the FSMC */
  
    regval  = getreg32( STM32_RCC_AHB3ENR);
    regval |= RCC_AHB3ENR_FSMCEN;
    putreg32(regval, STM32_RCC_AHB3ENR);
  }
  
  /************************************************************************************
   * Name: stm32_disablefsmc
   *
   * Description:
   *  enable clocking to the FSMC module
   *
   ************************************************************************************/
  
  void stm32_disablefsmc(void)
  {
    uint32_t regval;
  
    /* Disable AHB clocking to the FSMC */
  
    regval  = getreg32(STM32_RCC_AHB3ENR);
    regval &= ~RCC_AHB3ENR_FSMCEN;
    putreg32(regval, STM32_RCC_AHB3ENR);
  }
  