/****************************************************************************
 * arch/arm/src/xmc4/xmc4_usic.h
 *
 *   Copyright (C) 2017 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.
 *
 ****************************************************************************/

#ifndef __ARCH_ARM_SRC_XMC4_XMC4_USIC_H
#define __ARCH_ARM_SRC_XMC4_XMC4_USIC_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#include <stdint.h>
#include "xmc4_config.h"

/****************************************************************************
 * Public Types
 ****************************************************************************/

/* This enumeration identifies the USIC */

enum usic_e
{
  USIC0       = 0,    /* USIC0 */
  USIC1       = 1,    /* USIC1 */
  USIC2       = 2     /* USIC2 */
};

/* This enumeration identifies USIC channels */

enum usic_channel_e
{
  USIC0_CHAN0 = 0,    /* USIC0, Channel 0 */
  USIC0_CHAN1 = 1,    /* USIC0, Channel 1 */
  USIC1_CHAN0 = 2,    /* USIC1, Channel 0 */
  USIC1_CHAN1 = 3,    /* USIC1, Channel 1 */
  USIC2_CHAN0 = 4,    /* USIC2, Channel 0 */
  USIC2_CHAN1 = 5     /* USIC2, Channel 1 */
};

/* This enumeration defines values for the dx input selection */

enum uart_dx_e
{
  USIC_DXA    = 0,    /* USICn_DXmA */
  USIC_DXB    = 1,    /* USICn_DXmB */
  USIC_DXC    = 2,    /* USICn_DXmC */
  USIC_DXD    = 3,    /* USICn_DXmD */
  USIC_DXE    = 4,    /* USICn_DXmE */
  USIC_DXF    = 5,    /* USICn_DXmF */
  USIC_DXG    = 6     /* USICn_DXmG */
};

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Name: xmc4_enable_usic
 *
 * Description:
 *   Enable the USIC module indicated by the 'usic' enumeration value
 *
 * Returned Value:
 *   Zero (OK) is returned on success; A negated errno value is returned to
 *   indicate the nature of any failure.
 *
 ****************************************************************************/

int xmc4_enable_usic(enum usic_e usic);

/****************************************************************************
 * Name: xmc4_disable_usic
 *
 * Description:
 *   Disable the USIC module indicated by the 'usic' enumeration value
 *
 * Returned Value:
 *   Zero (OK) is returned on success; A negated errno value is returned to
 *   indicate the nature of any failure.
 *
 ****************************************************************************/

int xmc4_disable_usic(enum usic_e usic);

/****************************************************************************
 * Name: xmc4_channel2usic
 *
 * Description:
 *   Given a USIC channel enumeration value, return the corresponding USIC
 *   enumerication value.
 *
 * Returned Value:
 *   The corresponding USIC enumeration value.
 *
 ****************************************************************************/

static inline enum usic_e xmc4_channel2usic(enum usic_channel_e channel)
{
  return (enum usic_e)((unsigned int)channel >> 1);
}

/****************************************************************************
 * Name: xmc4_channel_baseaddress
 *
 * Description:
 *   Given a USIC channel enumeration value, return the base address of the
 *   channel registers.
 *
 * Returned Value:
 *   The non-zero address of the channel base registers is return on success.
 *   Zero is returned on any failure.
 *
 ****************************************************************************/

uintptr_t xmc4_channel_baseaddress(enum usic_channel_e channel);

/****************************************************************************
 * Name: xmc4_enable_usic_channel
 *
 * Description:
 *   Enable the USIC channel indicated by 'channel'.  Also enable and reset
 *   the USIC module if it is not already enabled.
 *
 * Returned Value:
 *   Zero (OK) is returned on success; A negated errno value is returned to
 *   indicate the nature of any failure.
 *
 ****************************************************************************/

int xmc4_enable_usic_channel(enum usic_channel_e channel);

/****************************************************************************
 * Name: xmc4_disable_usic_channel
 *
 * Description:
 *   Disable the USIC channel indicated by 'channel'.  Also disable and reset
 *   the USIC module if both channels have been disabled.
 *
 * Returned Value:
 *   Zero (OK) is returned on success; A negated errno value is returned to
 *   indicate the nature of any failure.
 *
 ****************************************************************************/

int xmc4_disable_usic_channel(enum usic_channel_e channel);

/****************************************************************************
 * Name: xmc4_usic_baudrate
 *
 * Description:
 *   Set the USIC baudrate for the USIC channel
 *
 * Returned Value:
 *   Zero (OK) is returned on success; A negated errno value is returned to
 *   indicate the nature of any failure.
 *
 ****************************************************************************/

int xmc4_usic_baudrate(enum usic_channel_e channel, uint32_t baud,
                       uint32_t oversampling);

#endif /* __ARCH_ARM_SRC_XMC4_XMC4_USIC_H */