415 lines
13 KiB
C
415 lines
13 KiB
C
/****************************************************************************
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* board/xtr_serial.c
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*
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* Copyright (C) 2008 Jacques Pelletier. All rights reserved.
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* Author: Jacques Pelletier
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*
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* This file is a part of NuttX and hence
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/serial.h>
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#include <arch/serial.h>
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#include "up_arch.h"
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#include "os_internal.h"
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#include "up_internal.h"
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#if CONFIG_NFILE_DESCRIPTORS > 0
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#if defined(CONFIG_DEV_CONSOLE) && !defined(CONFIG_DEV_LOWCONSOLE)
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/****************************************************************************
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* Definitions
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****************************************************************************/
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#define TRSDOS 0 /* TRSDOS 1.3 */
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#define LDOS 1 /* LDOS 5.3.1 */
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#define MODEM_STATUS 0xe8
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#define RESET 0xe8
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#define BAUD 0xe9
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#define STATUS 0xea
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#define CONTROL 0xea
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#define RECV_REG 0xeb
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#define XMIT_REG 0xeb
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#define XMIT_REG_EMPTY 0x40
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#define WRINTMASK 0xe0
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#define MASK_XMIT_INT 0x10
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#define MASK_RECV_INT 0x20
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#define MASK_ERR_INT 0x40
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#if TRSDOS
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#define WRINTMASK_SHADOW 0x4213
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#define XMIT_INT_VECTOR 0x4207
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#define RECV_INT_VECTOR 0x420a
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#endif
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#if LDOS
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#define WRINTMASK_SHADOW 0x4474
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#define XMIT_INT_VECTOR 0x447D
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#define RECV_INT_VECTOR 0x447F
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int up_setup(struct uart_dev_s *dev);
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static void up_shutdown(struct uart_dev_s *dev);
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static int up_attach(struct uart_dev_s *dev);
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static void up_detach(struct uart_dev_s *dev);
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static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
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static int up_receive(struct uart_dev_s *dev, uint32 *status);
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static void up_rxint(struct uart_dev_s *dev, boolean enable);
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static boolean up_rxavailable(struct uart_dev_s *dev);
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static void up_send(struct uart_dev_s *dev, int ch);
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static void up_txint(struct uart_dev_s *dev, boolean enable);
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static boolean up_txready(struct uart_dev_s *dev);
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static boolean up_txempty(struct uart_dev_s *dev);
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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struct uart_ops_s g_uart_ops =
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{
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up_setup, /* setup */
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up_shutdown, /* shutdown */
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up_attach, /* attach */
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up_detach, /* detach */
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up_ioctl, /* ioctl */
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up_receive, /* receive */
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up_rxint, /* rxint */
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up_rxavailable, /* rxavailable */
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up_send, /* send */
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up_txint, /* txint */
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up_txready, /* txready */
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up_txempty, /* txempty */
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};
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/* I/O buffers */
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static char g_uartrxbuffer[CONFIG_UART_RXBUFSIZE];
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static char g_uarttxbuffer[CONFIG_UART_TXBUFSIZE];
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/* This describes the state of the fake UART port. */
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static uart_dev_t g_uartport =
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{
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0, /* open_count */
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FALSE, /* xmitwaiting */
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FALSE, /* recvwaiting */
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FALSE, /* isconsole */
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{ 1 }, /* closesem */
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{ 0 }, /* xmitsem */
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{ 0 }, /* recvsem */
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{ /* xmit */
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{ 1 }, /* sem */
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0, /* head */
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0, /* tail */
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CONFIG_UART_TXBUFSIZE, /* size */
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g_uarttxbuffer, /* buffer */
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},
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{ /* recv */
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{ 1 }, /* sem */
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0, /* head */
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0, /* tail */
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CONFIG_UART_RXBUFSIZE, /* size */
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g_uartrxbuffer, /* buffer */
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},
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&g_uart_ops, /* ops */
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NULL, /* priv */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_setup
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*
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* Description:
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* Configure the UART baud, bits, parity, fifos, etc. This
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* method is called the first time that the serial port is
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* opened.
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*
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****************************************************************************/
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static int up_setup(struct uart_dev_s *dev)
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{
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outp(RESET, 0);
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outp(CONTROL, ctrl);
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outp(BAUD, baud);
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return OK;
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}
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/****************************************************************************
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* Name: up_shutdown
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*
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* Description:
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* Disable the UART. This method is called when the serial
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* port is closed
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*
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****************************************************************************/
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static void up_shutdown(struct uart_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: up_attach
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*
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* Description:
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* Configure the UART to operation in interrupt driven mode. This method is
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* called when the serial port is opened. Normally, this is just after the
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* the setup() method is called, however, the serial console may operate in
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* a non-interrupt driven mode during the boot phase.
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*
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* RX and TX interrupts are not enabled when by the attach method (unless the
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* hardware supports multiple levels of interrupt enabling). The RX and TX
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* interrupts are not enabled until the txint() and rxint() methods are called.
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*
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****************************************************************************/
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static int up_attach(struct uart_dev_s *dev)
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{
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// SDCC complains here
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// *((void (*)()) XMIT_INT_VECTOR) = rs232_xmitisr;
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// *((void (*)()) RECV_INT_VECTOR) = rs232_recvisr;
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*((int *) XMIT_INT_VECTOR) = (int) rs232_xmitisr;
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*((int *) RECV_INT_VECTOR) = (int) rs232_recvisr;
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*(char *)WRINTMASK_SHADOW &= ~(MASK_ERR_INT | MASK_XMIT_INT);
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outp(WRINTMASK, *(char *)WRINTMASK_SHADOW |= MASK_RECV_INT);
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return OK;
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}
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/****************************************************************************
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* Name: up_detach
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*
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* Description:
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* Detach UART interrupts. This method is called when the serial port is
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* closed normally just before the shutdown method is called. The exception is
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* the serial console which is never shutdown.
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*
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****************************************************************************/
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static void up_detach(struct uart_dev_s *dev)
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{
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outp(WRINTMASK, *(char *)WRINTMASK_SHADOW &= ~(MASK_ERR_INT | MASK_RECV_INT | MASK_XMIT_INT));
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*((int *) XMIT_INT_VECTOR) = 0x35fa;
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*((int *) RECV_INT_VECTOR) = 0x35fa;
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}
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/****************************************************************************
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* Name: up_ioctl
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*
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* Description:
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* All ioctl calls will be routed through this method
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*
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****************************************************************************/
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static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
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{
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*get_errno_ptr() = ENOTTY;
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return ERROR;
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}
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/****************************************************************************
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* Name: up_receive
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*
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* Description:
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* Called (usually) from the interrupt level to receive one
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* character from the UART. Error bits associated with the
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* receipt are provided in the the return 'status'.
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*
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****************************************************************************/
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static int up_receive(struct uart_dev_s *dev, uint32 *status)
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{
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// uint8 ch = z80_lowputc();
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*status = 0;
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return ch;
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}
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/****************************************************************************
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* Name: up_rxint
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*
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* Description:
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* Call to enable or disable RX interrupts
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*
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****************************************************************************/
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static void up_rxint(struct uart_dev_s *dev, boolean enable)
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{
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}
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/****************************************************************************
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* Name: up_rxavailable
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*
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* Description:
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* Return TRUE if the receive fifo is not empty
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*
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****************************************************************************/
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static boolean up_rxavailable(struct uart_dev_s *dev)
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{
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return TRUE;
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}
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/****************************************************************************
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* Name: up_send
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*
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* Description:
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* This method will send one byte on the UART
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*
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****************************************************************************/
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static void up_send(struct uart_dev_s *dev, int ch)
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{
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z80_lowputc(ch);
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}
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/****************************************************************************
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* Name: up_txint
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*
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* Description:
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* Call to enable or disable TX interrupts
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*
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****************************************************************************/
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static void up_txint(struct uart_dev_s *dev, boolean enable)
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{
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}
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/****************************************************************************
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* Name: up_txready
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*
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* Description:
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* Return TRUE if the transmit fifo is not full
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*
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****************************************************************************/
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static boolean up_txready(struct uart_dev_s *dev)
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{
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return TRUE;
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}
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/****************************************************************************
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* Name: up_txempty
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*
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* Description:
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* Return TRUE if the transmit fifo is empty
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*
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****************************************************************************/
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static boolean up_txempty(struct uart_dev_s *dev)
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{
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return TRUE;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_serialinit
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*
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* Description:
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* Performs the low level UART initialization early in
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* debug so that the serial console will be available
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* during bootup. This must be called before up_serialinit.
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*
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****************************************************************************/
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void up_earlyserialinit(void)
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{
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}
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#endif /* CONFIG_DEV_CONSOLE && !CONFIG_DEV_LOWCONSOLE */
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/****************************************************************************
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* Name: up_serialinit
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*
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* Description:
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* Register serial ports. This assumes
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* that up_earlyserialinit was called previously.
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*
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****************************************************************************/
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void up_serialinit(void)
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{
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#if defined(CONFIG_DEV_LOWCONSOLE)
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(void)lowconsole_init();
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#elif defined(CONFIG_DEV_CONSOLE)
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(void)uart_register("/dev/console", &g_uartport);
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(void)uart_register("/dev/ttyS0", &g_uartport);
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#endif
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}
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#endif /* CONFIG_NFILE_DESCRIPTORS */
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/****************************************************************************
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* Name: up_putc
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*
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* Description:
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* Provide priority, low-level access to support OS debug
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* writes
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*
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****************************************************************************/
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int up_putc(int ch)
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{
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z80_lowputc(ch);
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return 0;
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}
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