dm320_serial.c

這是一個實時嵌入式作業系統 實作了MCS51 ARM等MCU

/****************************************************************************
 * dm320/dm320_serial.c
 *
 *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <[e-mail]>
 *
 * 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 <sys/types.h>
#include <unistd.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>
#include <debug.h>

#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/serial.h>
#include <arch/serial.h>

#include "up_arch.h"
#include "os_internal.h"
#include "up_internal.h"

#if CONFIG_NFILE_DESCRIPTORS > 0

/****************************************************************************
 * Definitions
 ****************************************************************************/

#define BASE_BAUD 115200

/****************************************************************************
 * Private Types
 ****************************************************************************/

struct up_dev_s
{
  uint32               uartbase;	/* Base address of UART registers */
  uint32               baud;		/* Configured baud */
  uint16               msr;		/* Saved MSR value */
  ubyte                irq;		/* IRQ associated with this UART */
  ubyte                parity;		/* 0=none, 1=odd, 2=even */
  ubyte                bits;		/* Number of bits (7 or 8) */
  boolean              stopbits2;	/* TRUE: Configure with 2
					 * stop bits instead of 1 */
};

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

static int     up_setup(struct uart_dev_s *dev);
static void    up_shutdown(struct uart_dev_s *dev);
static int     up_attach(struct uart_dev_s *dev);
static void    up_detach(struct uart_dev_s *dev);
static int     up_interrupt(int irq, void *context);
static int     up_ioctl(struct file *filep, int cmd, unsigned long arg);
static int     up_receive(struct uart_dev_s *dev, uint32 *status);
static void    up_rxint(struct uart_dev_s *dev, boolean enable);
static boolean up_rxavailable(struct uart_dev_s *dev);
static void    up_send(struct uart_dev_s *dev, int ch);
static void    up_txint(struct uart_dev_s *dev, boolean enable);
static boolean up_txready(struct uart_dev_s *dev);
static boolean up_txempty(struct uart_dev_s *dev);

/****************************************************************************
 * Private Variables
 ****************************************************************************/

struct uart_ops_s g_uart_ops =
{
  .setup          = up_setup,
  .shutdown       = up_shutdown,
  .attach         = up_attach,
  .detach         = up_detach,
  .ioctl          = up_ioctl,
  .receive        = up_receive,
  .rxint          = up_rxint,
  .rxavailable    = up_rxavailable,
  .send           = up_send,
  .txint          = up_txint,
  .txready        = up_txready,
  .txempty        = up_txempty,
};

/* I/O buffers */

static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];

/* This describes the state of the DM320 uart0 port. */

static struct up_dev_s g_uart0priv =
{
  .uartbase       = DM320_UART0_REGISTER_BASE,
  .baud           = CONFIG_UART0_BAUD,
  .irq            = DM320_IRQ_UART0,
  .parity         = CONFIG_UART0_PARITY,
  .bits           = CONFIG_UART0_BITS,
  .stopbits2      = CONFIG_UART0_2STOP,
};

static uart_dev_t g_uart0port =
{
  .recv     =
  {
    .size   = CONFIG_UART0_RXBUFSIZE,
    .buffer = g_uart0rxbuffer,
  },
  .xmit     =
  {
    .size   = CONFIG_UART0_TXBUFSIZE,
    .buffer = g_uart0txbuffer,
  },
  .ops      = &g_uart_ops,
  .priv     = &g_uart0priv,
};

/* This describes the state of the DM320 uart1 port. */

static struct up_dev_s g_uart1priv =
{
  .uartbase       = DM320_UART1_REGISTER_BASE,
  .baud           = CONFIG_UART1_BAUD,
  .irq            = DM320_IRQ_UART1,
  .parity         = CONFIG_UART1_PARITY,
  .bits           = CONFIG_UART1_BITS,
  .stopbits2      = CONFIG_UART1_2STOP,
};

static uart_dev_t g_uart1port =
{
  .recv     =
  {
    .size   = CONFIG_UART1_RXBUFSIZE,
    .buffer = g_uart1rxbuffer,
  },
  .xmit     =
  {
    .size   = CONFIG_UART1_TXBUFSIZE,
    .buffer = g_uart1txbuffer,
   },
  .ops      = &g_uart_ops,
  .priv     = &g_uart1priv,
};

/* Now, which one with be tty0/console and which tty1? */

#ifdef CONFIG_SERIAL_IRDA_CONSOLE
# define CONSOLE_DEV     g_uart1port
# define TTYS0_DEV       g_uart1port
# define TTYS1_DEV       g_uart0port
#else
# define CONSOLE_DEV     g_uart0port
# define TTYS0_DEV       g_uart0port
# define TTYS1_DEV       g_uart1port
#endif

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: up_serialin
 ****************************************************************************/

static inline uint16 up_serialin(struct up_dev_s *priv, uint32 offset)
{
  return getreg16(priv->uartbase + offset);
}

/****************************************************************************
 * Name: up_serialout
 ****************************************************************************/

static inline void up_serialout(struct up_dev_s *priv, uint32 offset, uint16 value)
{
  putreg16(value, priv->uartbase + offset);
}

/****************************************************************************
 * Name: up_disableuartint
 ****************************************************************************/

static inline void up_disableuartint(struct up_dev_s *priv, uint16 *msr)
{
  if (msr)
    {
      *msr = priv->msr & UART_MSR_ALLIE;
    }

  priv->msr &= ~UART_MSR_ALLIE;
  up_serialout(priv, UART_MSR, priv->msr);
}

/****************************************************************************
 * Name: up_restoreuartint
 ****************************************************************************/

static inline void up_restoreuartint(struct up_dev_s *priv, uint16 msr)
{
  priv->msr |= msr & UART_MSR_ALLIE;
  up_serialout(priv, UART_MSR, priv->msr);
}

/****************************************************************************
 * Name: up_waittxready
 ****************************************************************************/

static inline void up_waittxready(struct up_dev_s *priv)
{
  int tmp;

  for (tmp = 1000 ; tmp > 0 ; tmp--)
    {
      if ((up_serialin(priv, UART_SR) & UART_SR_TFTI) != 0)
        {
          break;
        }
    }
}

/****************************************************************************
 * Name: up_enablebreaks
 ****************************************************************************/

static inline void up_enablebreaks(struct up_dev_s *priv, boolean enable)
{
  uint16 lcr = up_serialin(priv, UART_LCR);
  if (enable)
    {
      lcr |= UART_LCR_BOC;
    }
  else
    {
      lcr &= ~UART_LCR_BOC;
    }
  up_serialout(priv, UART_LCR, lcr);
}

/****************************************************************************
 * Name: up_setup
 *
 * Description:
 *   Configure the UART baud, bits, parity, fifos, etc. This
 *   method is called the first time that the serial port is
 *   opened.
 *
 ****************************************************************************/

static int up_setup(struct uart_dev_s *dev)
{
#ifndef CONFIG_SUPPRESS_UART_CONFIG
  struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
  uint16 brsr;

  /* Clear fifos */

  up_serialout(priv, UART_RFCR, 0x8000);
  up_serialout(priv, UART_TFCR, 0x8000);

  /* Set rx and tx triggers */

  up_serialout(priv, UART_RFCR, UART_RFCR_RTL_1);
  up_serialout(priv, UART_TFCR, UART_TFCR_TTL_16);

  /* Set up the MSR */

  priv->msr = up_serialin(priv, UART_MSR);
  if (priv->bits == 7)
    {
      priv->msr |= UART_DATABIT_7;
    }
  else
    {
      priv->msr &= ~UART_MSR_CLS;
    }

  if (priv->stopbits2)
    {
      priv->msr |= UART_STOPBIT_2;
    }
  else
    {
      priv->msr &= ~UART_MSR_SBLS;
    }

  if (priv->parity == 1)
    {
      priv->msr |= UART_ODDPARITY;
    }
  else if (priv->parity == 2)
    {
      priv->msr |= UART_EVENPARITY;
    }
  else
    {
      priv->msr &= ~(UART_MSR_PSB|UART_MSR_PEB);
    }

  /* Set up the BRSR */

  switch (priv->baud)
    {
      case 2400:
        brsr = UART_BAUD_2400;
        break;
      case 4800:
        brsr = UART_BAUD_4800;
        break;
      default:
      case 9600:
        brsr = UART_BAUD_9600;
        break;
      case 14400:
        brsr = UART_BAUD_14400;
        break;
      case 19200:
        brsr = UART_BAUD_19200;
        break;
      case 28800:
        brsr = UART_BAUD_28800;
        break;
      case 3840:
        brsr = UART_BAUD_38400;
        break;
      case 57600:
        brsr = UART_BAUD_57600;
        break;
      case 115200:
        brsr = UART_BAUD_115200;
        break;
      case 230400:
        brsr = UART_BAUD_230400;
        break;
      case 460800:
        brsr = UART_BAUD_460800;
        break;
      case 921600:
        brsr = UART_BAUD_921600;
        break;
    }

  /* Setup the new UART configuration */

  up_serialout(priv, UART_MSR, priv->msr);
  up_serialout(priv, UART_BRSR, brsr);
  up_enablebreaks(priv, FALSE);
#endif
  return OK;
}

/****************************************************************************
 * Name: up_shutdown
 *
 * Description:
 *   Disable the UART.  This method is called when the serial
 *   port is closed
 *
 ****************************************************************************/

static void up_shutdown(struct uart_dev_s *dev)
{
  struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
  up_disableuartint(priv, NULL);
}

/****************************************************************************
 * Name: up_attach
 *
 * Description:
 *   Configure the UART to operation in interrupt driven mode.  This method is
 *   called when the serial port is opened.  Normally, this is just after the
 *   the setup() method is called, however, the serial console may operate in
 *   a non-interrupt driven mode during the boot phase.
 *
 *   RX and TX interrupts are not enabled when by the attach method (unless the
 *   hardware supports multiple levels of interrupt enabling).  The RX and TX
 *   interrupts are not enabled until the txint() and rxint() methods are called.
 *
 ****************************************************************************/

static int up_attach(struct uart_dev_s *dev)
{