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/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *   Massimiliano Giorgi <massy@gandalf.sssup.it>
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 *   Luca Abeni          <luca@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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/**
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 ------------
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 CVS :        $Id: scom.h,v 1.1 2003-03-24 10:54:17 pj Exp $
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 File:        $File$
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 Revision:    $Revision: 1.1 $
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 Last update: $Date: 2003-03-24 10:54:17 $
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 ------------
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**/
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/*
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 * Copyright (C) 2000 Gerardo Lamastra
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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/* Project:     HARTIK 3.0                                      */
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/* Description: Hard Real TIme Kernel for 386 & higher machines */
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/* Author:      Gerardo Lamastra                                */
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/* Date:        9/5/96                                          */
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/* File:        SCOM.H                                          */
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/* Revision:    2.0                                             */
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#ifndef __SCOM_H__
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#define __SCOM_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <modules/sem.h>
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/* Number of available COM links */
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#define COM_LINKS       4
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#define COM1            0
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#define COM2            1
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#define COM3            2
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#define COM4            3
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/* These values identify interrupt type */
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#define RX_FULL         1
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#define TX_EMPTY        2
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#define LS_CHANGED      4
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#define MS_CHANGED      8
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/* This is set when the channel is open */
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#define LINK_BUSY       128
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/* This is set if the fast handler is installed */
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#define FAST_INSTALLED  64
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/* Register displacements */
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#define THR     0
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#define RBR     0
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#define IER     1
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#define FCR     2
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#define IIR     2
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#define LCR     3
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#define MCR     4
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#define LSR     5
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#define MSR     6
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#define SPad    7
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/* Parity value */
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#define NONE    0
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#define ODD     1
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#define EVEN    3
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/* Used for decoding the IIR status */
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extern const int IIRbits[];
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#define DECODE(v)       IIRbits[((v >> 1) & 3)]
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#define PENDIRQ(v)      !((v) & 1)
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/* Bit setting macros */
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#define bit_on(v,b)     v |= (b)
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#define bit_off(v,b)    v &= (~(b))
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/* The descriptor of a serial link                               */
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/* Each array entry is associated to a COM port                  */
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/* The control field is used to specify which kind of interrupts */
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/* are going to be served; the status field tracks if the entry  */
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/* is curretly used & if the shared fast handler is linked       */
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/* The semaphores are opened if you use an asyncronous server    */
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/* with the link                                                 */
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extern struct COM_LINK {
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    /* These fields are for general use */
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    BYTE status;
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    BYTE control;
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    BYTE request;
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    BYTE msk;
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    PID server;
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    sem_t mutex;
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    sem_t tx_sem;
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    sem_t rx_sem;
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    BYTE *tx_buf;
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    BYTE *rx_buf;
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    unsigned tx_len,rx_len;
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    unsigned tx_cnt,rx_cnt;
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} com_link[COM_LINKS];
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/* Available servers */
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TASK duplexServer(int port);
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TASK rxServer(int port);
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int com_open(unsigned int port,DWORD speed,BYTE parity,BYTE len,BYTE stop);
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int com_server(unsigned int port,unsigned int control,PID server);
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int com_close(unsigned int port);
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unsigned com_read(unsigned int port,unsigned int reg);
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unsigned com_receive(unsigned int port);
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void com_write(unsigned int port,unsigned int reg,unsigned int value);
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void com_send(unsigned int port,BYTE b);
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void com_AsyncSend(int port,void *buf,unsigned int len);
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void com_AsyncReceive(int port,void *buf,unsigned int len);
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#ifdef __cplusplus
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};
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#endif
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#endif