/****************************************************************************
* board/z80_serial.c
*
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <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
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int up_setup(struct uart_dev_s *dev);
static void up_shutdown(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_rxfifonotempty(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_txfifonotfull(struct uart_dev_s *dev);
static boolean up_txfifoempty(struct uart_dev_s *dev);
/****************************************************************************
* Private Variables
****************************************************************************/
struct uart_ops_s g_uart_ops =
{
up_setup, /* setup */
up_shutdown, /* shutdown */
up_interrupt, /* handler */
up_ioctl, /* ioctl */
up_receive, /* receive */
up_rxint, /* rxint */
up_rxfifonotempty, /* rxfifonotempty */
up_send, /* send */
up_txint, /* txint */
up_txfifonotfull, /* txfifonotfull */
up_txfifoempty, /* txfifoempty */
};
/* I/O buffers */
static char g_uartrxbuffer[CONFIG_UART_RXBUFSIZE];
static char g_uarttxbuffer[CONFIG_UART_TXBUFSIZE];
/* This describes the state of the fake UART port. */
static uart_dev_t g_uartport =
{
0, /* open_count */
0, /* irq */
FALSE, /* xmitwaiting */
FALSE, /* recvwaiting */
TRUE, /* isconsole */
{ 1 }, /* closesem */
{ 0 }, /* xmitsem */
{ 0 }, /* recvsem */
{ /* xmit */
{ 1 }, /* sem */
0, /* head */
0, /* tail */
CONFIG_UART_TXBUFSIZE, /* size */
g_uarttxbuffer, /* buffer */
},
{ /* recv */
{ 1 }, /* sem */
0, /* head */
0, /* tail */
CONFIG_UART_RXBUFSIZE, /* size */
g_uartrxbuffer, /* buffer */
},
&g_uart_ops, /* ops */
NULL, /* priv */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* 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)
{
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)
{
}
/****************************************************************************
* Name: up_interrupt
*
* Description:
* This is the UART interrupt handler. It will be invoked
* when an interrupt received on the 'irq' It should call
* uart_transmitchars or uart_receivechar to perform the
* appropriate data transfers. The interrupt handling logic\
* must be able to map the 'irq' number into the approprite
* uart_dev_s structure in order to call these functions.
*
****************************************************************************/
static int up_interrupt(int irq, void *context)
{
return OK;
}
/****************************************************************************
* Name: up_ioctl
*
* Description:
* All ioctl calls will be routed through this method
*
****************************************************************************/
static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
{
*get_errno_ptr() = ENOTTY;
return ERROR;
}
/****************************************************************************
* Name: up_receive
*
* Description:
* Called (usually) from the interrupt level to receive one
* character from the UART. Error bits associated with the
* receipt are provided in the the return 'status'.
*
****************************************************************************/
static int up_receive(struct uart_dev_s *dev, uint32 *status)
{
uint8 ch = up_lowgetc();
*status = 0;
return ch;
}
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void up_rxint(struct uart_dev_s *dev, boolean enable)
{
}
/****************************************************************************
* Name: up_rxfifonotempty
*
* Description:
* Return TRUE if the receive fifo is not empty
*
****************************************************************************/
static boolean up_rxfifonotempty(struct uart_dev_s *dev)
{
return TRUE;
}
/****************************************************************************
* Name: up_send
*
* Description:
* This method will send one byte on the UART
*
****************************************************************************/
static void up_send(struct uart_dev_s *dev, int ch)
{
up_lowputc(ch);
}
/****************************************************************************
* Name: up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void up_txint(struct uart_dev_s *dev, boolean enable)
{
}
/****************************************************************************
* Name: up_txfifonotfull
*
* Description:
* Return TRUE if the tranmsit fifo is not full
*
****************************************************************************/
static boolean up_txfifonotfull(struct uart_dev_s *dev)
{
return TRUE;
}
/****************************************************************************
* Name: up_txfifoempty
*
* Description:
* Return TRUE if the transmit fifo is empty
*
****************************************************************************/
static boolean up_txfifoempty(struct uart_dev_s *dev)
{
return FALSE;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Performs the low level UART initialization early in
* debug so that the serial console will be available
* during bootup. This must be called before up_serialinit.
*
****************************************************************************/
void up_earlyserialinit(void)
{
}
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyserialinit was called previously.
*
****************************************************************************/
void up_serialinit(void)
{
(void)uart_register("/dev/console", &g_uartport);
(void)uart_register("/dev/ttyS0", &g_uartport);
}
#endif /* CONFIG_NFILE_DESCRIPTORS > 0 */
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug
* writes
*
****************************************************************************/
int up_putc(int ch)
{
up_lowputc(ch);
return 0;
}
