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/** rt_com
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* ======
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*
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* RT-Linux kernel module for communication across serial lines.
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*
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* Copyright (C) 1997 Jens Michaelsen
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* Copyright (C) 1997-2000 Jochen Kupper
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* Copyright (C) 1999 Hua Mao <hmao@nmt.edu>
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* Copyright (C) 1999 Roberto Finazzi
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* Copyright (C) 2000-2002 Giuseppe Renoldi
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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; see the file License. if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307, USA.
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*
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* $Id: aip_com.c,v 1.1 2005/09/16 14:16:31 hm Exp hm $ */
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#define VERSION "0.6.pre2-rtaicvs (modified by Hm, IgH for aip)" //Hm, IgH
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#ifdef _RTAI
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#include <rtai.h>
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#endif
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#include "aip_com.h"
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#include "aip_comP.h"
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#include <msr_rcsinfo.h>
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RCS_ID("$Header: /home/hm/projekte/msr_messen_steuern_regeln/ethercat/src-hm/rs232rt/RCS/aip_com.c,v 1.1 2005/09/16 14:16:31 hm Exp hm $");
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/* Hm, IgH
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MODULE_AUTHOR("Jochen Kuepper");
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MODULE_DESCRIPTION("real-time serial port driver");
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MODULE_LICENSE("GPL");
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*/
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/* size of internal queues
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* This is the default value. */
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unsigned int rt_com_buffersize = RT_COM_BUF_SIZ;
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/** Default: mode=0 - no hw flow control
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* used=0 - port and irq setting by rt_com_hwparam.
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* If you want to work like
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* a standard rt_com you can set used=1. */
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struct rt_com_struct rt_com_table[] = {
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{ // ttyS0 - COM1
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RT_COM_BASE_BAUD, // int baud_base;
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0x3f8, // int port;
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4, // int irq;
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rt_com0_isr, // void (*isr)(void);
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115200, // int baud;
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8, // unsigned int wordlength;
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RT_COM_PARITY_NONE, // unsigned int parity;
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1, // stopbits;
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RT_COM_NO_HAND_SHAKE, // int mode;
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RT_COM_FIFO_SIZE_8, // int fifotrig;
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1 //Hm, IgH // int used;
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}, { // ttyS1 - COM2
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RT_COM_BASE_BAUD, // int baud_base;
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0x2f8, // int port;
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3, // int irq;
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rt_com1_isr, // void (*isr)(void);
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0, // int baud;
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8, // unsigned int wordlength;
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RT_COM_PARITY_NONE, // unsigned int parity;
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1, // stopbits;
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RT_COM_NO_HAND_SHAKE, // int mode;
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RT_COM_FIFO_SIZE_8, // int fifotrig;
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0 // int used;
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}
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};
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/** Number and descriptions of serial ports to manage. You also need
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* to create an ISR ( rt_comN_isr() ) for each port. */
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#define RT_COM_CNT (sizeof(rt_com_table) / sizeof(struct rt_com_struct))
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/** Internal: Remaining free space of buffer
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*
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* @return amount of free space remaining in a buffer (input or output)
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*
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* @author Jochen Kupper
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* @version 2000/03/10 */
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static inline unsigned int rt_com_buffer_free(unsigned int head, unsigned int tail)
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{
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return(head < tail) ? (tail - head) : (rt_com_buffersize - (head - tail));
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}
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/** Clear input buffer.
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*
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* @param ttyS Port to use; corresponding to internal numbering scheme.
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* @return 0 if all right, -ENODEV or -EPERM on error.
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*
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* @author Roberto Finazzi, Jochen Kupper
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* @version 2000/03/12 */
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int rt_com_clear_input(unsigned int ttyS)
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{
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if (ttyS >= RT_COM_CNT) {
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return(-ENODEV);
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}
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else if (0 >= (rt_com_table[ttyS]).used) {
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return(-EPERM);
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}
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else {
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struct rt_com_struct *p = &(rt_com_table[ttyS]);
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struct rt_buf_struct *b = &(p->ibuf);
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long state;
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rt_com_irq_off(state);
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b->tail = b->head;
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if (p->fifotrig)
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outb(inb(p->port + RT_COM_FCR) | FCR_INPUT_FIFO_RESET, p->port + RT_COM_FCR);
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rt_com_irq_on(state);
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if (p->mode & RT_COM_HW_FLOW) {
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/* with hardware flow set RTS */
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p->mcr |= MCR_RTS;
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outb(p->mcr, p->port + RT_COM_MCR);
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}
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return(0);
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}
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}
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/** Clear output buffer.
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*
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* @param ttyS Port to use; corresponding to internal numbering scheme.
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* @return 0 if all right, negative error conditions otherwise
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*
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* @author Roberto Finazzi, Jochen Kupper
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* @version 2000/03/12
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*/
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int rt_com_clear_output(unsigned int ttyS)
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{
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if (ttyS >= RT_COM_CNT) {
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return(-ENODEV);
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}
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else {
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struct rt_com_struct *p = &(rt_com_table[ttyS]);
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if (0 >= (rt_com_table[ttyS]).used) {
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return(-EPERM);
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}
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else {
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struct rt_buf_struct *b = &(p->obuf);
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long state;
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rt_com_irq_off(state);
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p->ier &= ~IER_ETBEI;
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outb(p->ier, p->port | RT_COM_IER);
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b->tail = b->head;
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if (p->fifotrig)
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outb(inb(p->port + RT_COM_FCR) | FCR_OUTPUT_FIFO_RESET, p->port + RT_COM_FCR);
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rt_com_irq_on(state);
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return(0);
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}
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}
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}
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/** Set functioning mode.
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*
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* @param ttyS Port to use; corresponding to internal numbering scheme.
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* @param mode functioning mode
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* @return 0 if all right, negative on error
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*
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* @author Roberto Finazzi, Jochen Kupper
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* @version 2000/03/12
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*/
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int rt_com_set_mode(unsigned int ttyS, int mode)
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{
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if (ttyS >= RT_COM_CNT) {
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return(-ENODEV);
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}
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else {
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struct rt_com_struct *p = &(rt_com_table[ttyS]);
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if (0 >= p->used) {
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return(-EPERM);
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}
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else {
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p->mode = mode;
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if (p->used & RT_COM_PORT_SETUP) {
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/* setup done */
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if (mode == RT_COM_NO_HAND_SHAKE) {
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/* if no hw signals disable modem interrupts */
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p->ier &= ~IER_EDSSI;
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}
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else {
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/* else enable it */
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p->ier |= IER_EDSSI;
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}
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outb(p->ier, p->port + RT_COM_IER);
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}
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return(0);
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}
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}
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}
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/** Set receiver fifo trigger level.
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*
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* @param ttyS Port to use; corresponding to internal numbering scheme.
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* @param fifotrig receiver fifo trigger level
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* @return 0 if all right, negative on error
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*
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* @author Roberto Finazzi, Jochen Kupper
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* @version 2000/03/12
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*/
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int rt_com_set_fifotrig(unsigned int ttyS, int fifotrig)
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{
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if (ttyS >= RT_COM_CNT) {
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return(-ENODEV);
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}
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else {
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struct rt_com_struct *p = &(rt_com_table[ttyS]);
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p->fifotrig = fifotrig;
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if (p->used & RT_COM_PORT_SETUP) {
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/* setup done */
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if (p->fifotrig)
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outb(FCR_FIFO_ENABLE | p->fifotrig, p->port + RT_COM_FCR); // enable fifo
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else
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outb(0, p->port + RT_COM_FCR); // disable fifo
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}
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}
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return(0);
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}
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/** Set output signal for modem control (DTR, RTS).
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*
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* @param ttyS Port to use; corresponding to internal numbering scheme.
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* @param signal Output signals: RT_COM_DTR or RT_COM_RTS.
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* @param value Status: 0 or 1.
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* @return 0 if all right, negative error code otherwise
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*
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* @author Roberto Finazzi, Jochen Kupper
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* @version 2000/03/12 */
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int rt_com_write_modem(unsigned int ttyS, int signal, int value)
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{
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if (ttyS >= RT_COM_CNT) {
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return(-ENODEV);
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}
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else if (value &~0x01) {
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return(-EINVAL);
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}
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else {
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struct rt_com_struct *p = &(rt_com_table[ttyS]);
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if (0 >= p->used) {
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return(-EPERM);
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}
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else {
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if (value)
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p->mcr |= signal;
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else
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p->mcr &= ~signal;
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outb(p->mcr, p->port + RT_COM_MCR);
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return(0);
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}
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}
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}
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/** Read input signal from modem (CTS, DSR, RI, DCD).
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*
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* @param ttyS Port to use; corresponding to internal numbering scheme.
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* @param signal Input signals: RT_COM_CTS, RT_COM_DSR, RT_COM_RI, RT_COM_DCD
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* or any combination.
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* @return input signal status; that is the bitwise-OR of the signal
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* argument and the MSR register.
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*
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* @author Roberto Finazzi, Jochen Kupper
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* @version 2000/03/12 */
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int rt_com_read_modem(unsigned int ttyS, int signal)
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{
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if (ttyS >= RT_COM_CNT) {
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return(-ENODEV);
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}
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else if (signal & 0xf) {
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return(-EINVAL);
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}
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else {
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struct rt_com_struct *p = &(rt_com_table[ttyS]);
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if (0 >= p->used) {
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return(-EPERM);
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}
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else {
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return(inb(p->port + RT_COM_MSR) & signal);
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}
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}
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}
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/** Return last error detected.
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*
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* @param ttyS Port to use; corresponding to internal numbering scheme.
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* @return bit 0 :1 = Input buffer overflow
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* bit 1 :1 = Receive data overrun
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* bit 2 :1 = Parity error
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* bit 3 :1 = Framing error
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* bit 4 :1 = Break detected
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*
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* @author Roberto Finazzi
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* @version 2000/03/12
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*/
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int rt_com_error(unsigned int ttyS)
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{
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if (ttyS >= RT_COM_CNT) {
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return(-ENODEV);
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}
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else {
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struct rt_com_struct *p = &(rt_com_table[ttyS]);
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int tmp = p->error;
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p->error = 0;
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return(tmp);
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}
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}
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/** Write data to a line.
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*
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* @param ttyS Port to use; corresponding to internal numbering scheme.
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* @param buffer Address of data.
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* @param count Number of bytes to write. If negative, send byte only if
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* possible to send them all together.
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* @return Number of bytes not written. Negative values are error
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* conditions.
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*
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* @author Jens Michaelsen, Jochen Kupper, Giuseppe Renoldi
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* @version 2000/03/12 */
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int rt_com_write(unsigned int ttyS, char *buffer, int count)
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{
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if (ttyS >= RT_COM_CNT) {
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return(-ENODEV);
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}
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else {
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struct rt_com_struct *p = &(rt_com_table[ttyS]);
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if (!(p->used & RT_COM_PORT_SETUP)) {
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return(-EPERM);
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}
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else {
|
|
|
354 |
struct rt_buf_struct *b = &(p->obuf);
|
|
|
355 |
long state;
|
|
|
356 |
int bytestosend;
|
|
|
357 |
if (count == 0)
|
|
|
358 |
return(0);
|
|
|
359 |
bytestosend = rt_com_buffer_free(b->head, b->tail);
|
|
|
360 |
if (count < 0) {
|
|
|
361 |
count = -count;
|
|
|
362 |
if (count > bytestosend)
|
|
|
363 |
return(count);
|
|
|
364 |
bytestosend = count;
|
|
|
365 |
}
|
|
|
366 |
else {
|
|
|
367 |
if (count <= bytestosend)
|
|
|
368 |
bytestosend = count;
|
|
|
369 |
}
|
|
|
370 |
|
|
|
371 |
rt_com_irq_off(state);
|
|
|
372 |
while (bytestosend-- > 0) {
|
|
|
373 |
/* put byte into buffer, move pointers to next elements */
|
|
|
374 |
b->buf[b->head++] = *buffer++;
|
|
|
375 |
if (b->head >= rt_com_buffersize)
|
|
|
376 |
b->head = 0;
|
|
|
377 |
--count;
|
|
|
378 |
}
|
|
|
379 |
|
|
|
380 |
p->ier |= IER_ETBEI;
|
|
|
381 |
outb(p->ier, p->port + RT_COM_IER);
|
|
|
382 |
rt_com_irq_on(state);
|
|
|
383 |
return(count);
|
|
|
384 |
}
|
|
|
385 |
}
|
|
|
386 |
}
|
|
|
387 |
|
|
|
388 |
/** Read data we got from a line.
|
|
|
389 |
*
|
|
|
390 |
* @param ttyS Port to use corresponding to internal numbering scheme.
|
|
|
391 |
* @param buffer Address of data buffer. Needs to be of size > cnt !
|
|
|
392 |
* @param count Number of bytes to read.
|
|
|
393 |
* @return Number of bytes actually read.
|
|
|
394 |
*
|
|
|
395 |
* @author Jens Michaelsen, Jochen Kupper
|
|
|
396 |
* @version 2000/03/17 */
|
|
|
397 |
int rt_com_read(unsigned int ttyS, char *buffer, int count)
|
|
|
398 |
{
|
|
|
399 |
if (0 > count) {
|
|
|
400 |
return(-EINVAL);
|
|
|
401 |
}
|
|
|
402 |
else if (ttyS >= RT_COM_CNT) {
|
|
|
403 |
return(-ENODEV);
|
|
|
404 |
}
|
|
|
405 |
else {
|
|
|
406 |
struct rt_com_struct *p = &(rt_com_table[ttyS]);
|
|
|
407 |
if (!(p->used & RT_COM_PORT_SETUP)) {
|
|
|
408 |
return(-EPERM);
|
|
|
409 |
}
|
|
|
410 |
else {
|
|
|
411 |
struct rt_buf_struct *b = &(p->ibuf);
|
|
|
412 |
int done = 0;
|
|
|
413 |
long state;
|
|
|
414 |
rt_com_irq_off(state);
|
|
|
415 |
while ((b->head != b->tail) && (--count >= 0)) {
|
|
|
416 |
done++;
|
|
|
417 |
*buffer++ = b->buf[b->tail++];
|
|
|
418 |
b->tail &= (RT_COM_BUF_SIZ - 1);
|
|
|
419 |
}
|
|
|
420 |
|
|
|
421 |
rt_com_irq_on(state);
|
|
|
422 |
if ((p->mode & RT_COM_HW_FLOW) && (rt_com_buffer_free(b->head, b->tail) > RT_COM_BUF_HI)) {
|
|
|
423 |
/* if hardware flow and enough free space on input buffer
|
|
|
424 |
then set RTS */
|
|
|
425 |
p->mcr |= MCR_RTS;
|
|
|
426 |
outb(p->mcr, p->port + RT_COM_MCR);
|
|
|
427 |
}
|
|
|
428 |
|
|
|
429 |
return(done);
|
|
|
430 |
}
|
|
|
431 |
}
|
|
|
432 |
}
|
|
|
433 |
|
|
|
434 |
/** Get first byte from the write buffer.
|
|
|
435 |
*
|
|
|
436 |
* @param p rt_com_struct of the line we are writing to.
|
|
|
437 |
* @param c Address to put the char in.
|
|
|
438 |
* @return Number of characters we actually got.
|
|
|
439 |
*
|
|
|
440 |
* @author Jens Michaelsen, Jochen Kupper
|
|
|
441 |
* @version 1999/10/01
|
|
|
442 |
*/
|
|
|
443 |
static inline int rt_com_irq_get(struct rt_com_struct *p, unsigned char *c)
|
|
|
444 |
{
|
|
|
445 |
struct rt_buf_struct *b = &(p->obuf);
|
|
|
446 |
if (b->head != b->tail) {
|
|
|
447 |
*c = b->buf[b->tail++];
|
|
|
448 |
b->tail &= (RT_COM_BUF_SIZ - 1);
|
|
|
449 |
return(1);
|
|
|
450 |
}
|
|
|
451 |
|
|
|
452 |
return(0);
|
|
|
453 |
}
|
|
|
454 |
|
|
|
455 |
/** Concatenate a byte to the read buffer.
|
|
|
456 |
*
|
|
|
457 |
* @param p rt_com_struct of the line we are writing to.
|
|
|
458 |
* @param ch Byte to put into buffer.
|
|
|
459 |
*
|
|
|
460 |
* @author Jens Michaelsen, Jochen Kupper
|
|
|
461 |
* @version 1999/07/20 */
|
|
|
462 |
static inline void rt_com_irq_put(struct rt_com_struct *p, unsigned char ch)
|
|
|
463 |
{
|
|
|
464 |
struct rt_buf_struct *b = &(p->ibuf);
|
|
|
465 |
b->buf[b->head++] = ch;
|
|
|
466 |
b->head &= (RT_COM_BUF_SIZ - 1);
|
|
|
467 |
}
|
|
|
468 |
|
|
|
469 |
/** Real interrupt handler.
|
|
|
470 |
*
|
|
|
471 |
* This one is called by the registered ISRs and does the actual work.
|
|
|
472 |
*
|
|
|
473 |
* @param ttyS Port to use corresponding to internal numbering scheme.
|
|
|
474 |
*
|
|
|
475 |
* @author Jens Michaelsen, Jochen Kupper, Hua Mao, Roberto Finazzi
|
|
|
476 |
* @version 2000/03/17 */
|
|
|
477 |
static inline int rt_com_isr(unsigned int ttyS)
|
|
|
478 |
{
|
|
|
479 |
struct rt_com_struct *p = &(rt_com_table[ttyS]);
|
|
|
480 |
struct rt_buf_struct *b = &(p->ibuf);
|
|
|
481 |
unsigned int base = p->port;
|
|
|
482 |
int buff, data_to_tx;
|
|
|
483 |
int loop = 4;
|
|
|
484 |
int toFifo = 16;
|
|
|
485 |
unsigned char data, msr, lsr, iir;
|
|
|
486 |
|
|
|
487 |
do {
|
|
|
488 |
//iir=inb(base + RT_COM_IIR);
|
|
|
489 |
//rt_printk("iir=0x%02x\n",iir);
|
|
|
490 |
/* get available data from port */
|
|
|
491 |
lsr = inb(base + RT_COM_LSR);
|
|
|
492 |
if (0x1e & lsr)
|
|
|
493 |
p->error = lsr & 0x1e;
|
|
|
494 |
while (LSR_DATA_READY & lsr) {
|
|
|
495 |
data = inb(base + RT_COM_RXB);
|
|
|
496 |
|
|
|
497 |
//rt_printk("[%02x<- ",data);
|
|
|
498 |
rt_com_irq_put(p, data);
|
|
|
499 |
lsr = inb(base + RT_COM_LSR);
|
|
|
500 |
if (0x1e & lsr)
|
|
|
501 |
p->error = 0x1e & lsr;
|
|
|
502 |
}
|
|
|
503 |
|
|
|
504 |
/* controls on buffer full and RTS clear on hardware flow
|
|
|
505 |
control */
|
|
|
506 |
buff = rt_com_buffer_free(b->head, b->tail);
|
|
|
507 |
if (buff < RT_COM_BUF_FULL)
|
|
|
508 |
p->error = RT_COM_BUFFER_FULL;
|
|
|
509 |
|
|
|
510 |
if ((p->mode & RT_COM_HW_FLOW) && (buff < RT_COM_BUF_LOW)) {
|
|
|
511 |
p->mcr &= ~MCR_RTS;
|
|
|
512 |
outb(p->mcr, p->port + RT_COM_MCR);
|
|
|
513 |
}
|
|
|
514 |
|
|
|
515 |
/* if possible, put data to port */
|
|
|
516 |
msr = inb(base + RT_COM_MSR);
|
|
|
517 |
if
|
|
|
518 |
(
|
|
|
519 |
(p->mode == RT_COM_NO_HAND_SHAKE) ||
|
|
|
520 |
((p->mode & RT_COM_DSR_ON_TX) && (MSR_DSR & msr) && (p->mode & RT_COM_HW_FLOW) && (MSR_CTS & msr))
|
|
|
521 |
) {
|
|
|
522 |
/* (DSR && (CTS || Mode==no hw flow)) or Mode==no handshake */
|
|
|
523 |
// if (THRE==1) i.e. transmitter empty
|
|
|
524 |
if ((lsr = inb(base + RT_COM_LSR)) & LSR_THRE) {
|
|
|
525 |
// if there are data to transmit
|
|
|
526 |
if ((data_to_tx = rt_com_irq_get(p, &data)) != 0) {
|
|
|
527 |
do {
|
|
|
528 |
//rt_printk("->%02x] ",data);
|
|
|
529 |
outb(data, base + RT_COM_TXB);
|
|
|
530 |
} while ((--toFifo > 0) && (data_to_tx = rt_com_irq_get(p, &data) != 0));
|
|
|
531 |
}
|
|
|
532 |
|
|
|
533 |
if (!data_to_tx) {
|
|
|
534 |
/* no data in output buffer, disable Transmitter
|
|
|
535 |
Holding Register Empty Interrupt */
|
|
|
536 |
p->ier &= ~IER_ETBEI;
|
|
|
537 |
outb(p->ier, base + RT_COM_IER);
|
|
|
538 |
}
|
|
|
539 |
}
|
|
|
540 |
}
|
|
|
541 |
|
|
|
542 |
/* check the low nibble of IIR wheather there is another pending
|
|
|
543 |
interrupt. bit 0 = 0 if interrupt pending, bits 1,2,3
|
|
|
544 |
are the interrupt ID */
|
|
|
545 |
iir = inb(base + RT_COM_IIR);
|
|
|
546 |
} while (((iir & 0x0F) != 1) && (--loop > 0));
|
|
|
547 |
|
|
|
548 |
#if defined RTLINUX_V2
|
|
|
549 |
rtl_hard_enable_irq(p->irq);
|
|
|
550 |
#endif
|
|
|
551 |
return 0;
|
|
|
552 |
}
|
|
|
553 |
|
|
|
554 |
/** Interrupt Service Routines
|
|
|
555 |
*
|
|
|
556 |
* These are the Interrupt Service Routines to be registered with the
|
|
|
557 |
* OS. They simply call the genereric interrupt handler for the
|
|
|
558 |
* current port to do the work.
|
|
|
559 |
*
|
|
|
560 |
* @author Jens Michaelsen, Jochen Kupper, Hua Mao
|
|
|
561 |
* @version 1999/11/11 */
|
|
|
562 |
static void rt_com0_isr(void)
|
|
|
563 |
{
|
|
|
564 |
//rt_printk("rt_com0_isr\n");
|
|
|
565 |
rt_com_isr(0);
|
|
|
566 |
}
|
|
|
567 |
|
|
|
568 |
static void rt_com1_isr(void)
|
|
|
569 |
{
|
|
|
570 |
//rt_printk("rt_com1_isr\n");
|
|
|
571 |
rt_com_isr(1);
|
|
|
572 |
}
|
|
|
573 |
|
|
|
574 |
/** Setup one port
|
|
|
575 |
*
|
|
|
576 |
* Calls from init_module + cleanup_module have baud == 0; in these
|
|
|
577 |
* cases we only do some cleanup.
|
|
|
578 |
*
|
|
|
579 |
* To allocate a port, give usefull setup parameter, to deallocate
|
|
|
580 |
* give negative baud.
|
|
|
581 |
*
|
|
|
582 |
* @param ttyS Number corresponding to internal port numbering scheme.
|
|
|
583 |
* This is esp. the index of the rt_com_table to use.
|
|
|
584 |
* @param baud Data transmission rate to use [Byte/s]. If negative,
|
|
|
585 |
* deallocate port instead. Called with baud == 0 from
|
|
|
586 |
* init_module for basic initialization. Needs to be called
|
|
|
587 |
* by user-task again before use !
|
|
|
588 |
* @param mode see rt_com_set_mode docs for now
|
|
|
589 |
* @param parity Parity for transmission protocol.
|
|
|
590 |
* (RT_COM_PARITY_EVEN, RT_COM_PARITY_ODD, RT_COM_PARITY_NONE)
|
|
|
591 |
* @param stopbits Number of stopbits to use. 1 gives you one stopbit, 2
|
|
|
592 |
* actually gives really two stopbits for wordlengths of
|
|
|
593 |
* 6 - 8 bit, but 1.5 stopbits for a wordlength of 5 bits.
|
|
|
594 |
* @param wordlength Number of bits per word (5 - 8 bits).
|
|
|
595 |
* @param fifotrig if <0 set trigger fifo using default value set
|
|
|
596 |
* in rt_com_table[], otherwise set trigger fifo accordingly
|
|
|
597 |
* to the parameter
|
|
|
598 |
* @return 0 - all right
|
|
|
599 |
* -ENODEV - no entry for that ttyS in rt_com_table
|
|
|
600 |
* -EPERM - get hardware resources first (the port needs to
|
|
|
601 |
* be setup hardware-wise first, that means you have
|
|
|
602 |
* to specify a positive used flag at compile time
|
|
|
603 |
* or call rt_com_set_hwparm first.)
|
|
|
604 |
*
|
|
|
605 |
* @author Jens Michaelsen, Jochen Kupper, Roberto Finazzi
|
|
|
606 |
* @version 2000/03/12 */
|
|
|
607 |
int rt_com_setup
|
|
|
608 |
(
|
|
|
609 |
unsigned int ttyS,
|
|
|
610 |
int baud,
|
|
|
611 |
int mode,
|
|
|
612 |
unsigned int parity,
|
|
|
613 |
unsigned int stopbits,
|
|
|
614 |
unsigned int wordlength,
|
|
|
615 |
int fifotrig
|
|
|
616 |
)
|
|
|
617 |
{
|
|
|
618 |
if (ttyS >= RT_COM_CNT) {
|
|
|
619 |
return(-ENODEV);
|
|
|
620 |
}
|
|
|
621 |
else {
|
|
|
622 |
struct rt_com_struct *p = &(rt_com_table[ttyS]);
|
|
|
623 |
if (0 == p->used) {
|
|
|
624 |
/* */
|
|
|
625 |
return(-EPERM);
|
|
|
626 |
}
|
|
|
627 |
else {
|
|
|
628 |
unsigned int base = p->port;
|
|
|
629 |
|
|
|
630 |
/* Stop everything, set DLAB */
|
|
|
631 |
outb(0x00, base + RT_COM_IER);
|
|
|
632 |
outb(0x80, base + RT_COM_LCR);
|
|
|
633 |
|
|
|
634 |
/* clear irqs */
|
|
|
635 |
inb(base + RT_COM_IIR);
|
|
|
636 |
inb(base + RT_COM_LSR);
|
|
|
637 |
inb(base + RT_COM_RXB);
|
|
|
638 |
inb(base + RT_COM_MSR);
|
|
|
639 |
|
|
|
640 |
/* initialize error code */
|
|
|
641 |
p->error = 0;
|
|
|
642 |
|
|
|
643 |
/* if 0 == baud, nothing else to do ! */
|
|
|
644 |
if (baud == 0)
|
|
|
645 |
return(0);
|
|
|
646 |
|
|
|
647 |
if (0 > baud) {
|
|
|
648 |
/* free the port */
|
|
|
649 |
/* disable interrupts */
|
|
|
650 |
outb(0, base + RT_COM_IER);
|
|
|
651 |
//MOD_DEC_USE_COUNT; Hm, IgH
|
|
|
652 |
return(0);
|
|
|
653 |
}
|
|
|
654 |
else {
|
|
|
655 |
/* allocate and set-up the port */
|
|
|
656 |
unsigned int divider = p->baud_base / baud;
|
|
|
657 |
|
|
|
658 |
//MOD_INC_USE_COUNT; Hm, IgH
|
|
|
659 |
|
|
|
660 |
/* set transfer rate */
|
|
|
661 |
outb(divider % 256, base + RT_COM_DLL);
|
|
|
662 |
outb(divider / 256, base + RT_COM_DLM);
|
|
|
663 |
|
|
|
664 |
/* bits 3,4 + 5 determine parity, mask away anything else */
|
|
|
665 |
parity &= 0x38;
|
|
|
666 |
|
|
|
667 |
/* set transmission parameters and clear DLAB */
|
|
|
668 |
outb((wordlength - 5) | ((stopbits - 1) << 2) | parity, base + RT_COM_LCR);
|
|
|
669 |
|
|
|
670 |
/* set-up MCR value and write it */
|
|
|
671 |
p->mcr = MCR_DTR | MCR_RTS | MCR_OUT1 | MCR_OUT2;
|
|
|
672 |
outb(p->mcr, base + RT_COM_MCR);
|
|
|
673 |
|
|
|
674 |
/* set-up IER value and write it */
|
|
|
675 |
p->mode = mode;
|
|
|
676 |
if (p->mode == RT_COM_NO_HAND_SHAKE) {
|
|
|
677 |
/* if no handshaking signals enable only receiver interrupts */
|
|
|
678 |
p->ier = IER_ERBI | IER_ELSI;
|
|
|
679 |
}
|
|
|
680 |
else {
|
|
|
681 |
/* enable receiver and modem interrupts */
|
|
|
682 |
p->ier = IER_ERBI | IER_ELSI | IER_EDSSI;
|
|
|
683 |
}
|
|
|
684 |
|
|
|
685 |
outb(p->ier, base + RT_COM_IER);
|
|
|
686 |
if (fifotrig>=0)
|
|
|
687 |
p->fifotrig = fifotrig;
|
|
|
688 |
outb(FCR_FIFO_ENABLE | p->fifotrig, base + RT_COM_FCR); // enable fifo
|
|
|
689 |
/* mark setup done */
|
|
|
690 |
p->used |= RT_COM_PORT_SETUP;
|
|
|
691 |
return(0);
|
|
|
692 |
}
|
|
|
693 |
}
|
|
|
694 |
|
|
|
695 |
return(0);
|
|
|
696 |
}
|
|
|
697 |
}
|
|
|
698 |
|
|
|
699 |
/** Set hardware parameter for a specific port.
|
|
|
700 |
*
|
|
|
701 |
* Change port address and irq setting for a specified port. The port
|
|
|
702 |
* must have an entry in rt_com_table beforehand.
|
|
|
703 |
*
|
|
|
704 |
* To allow the specification of additional ports we would need to
|
|
|
705 |
* dynamically allocate memory, that's not really feasible within a
|
|
|
706 |
* real-time context, although we could preallocate a few entries in
|
|
|
707 |
* init_module. However, it doesn't make too much sense, as you can
|
|
|
708 |
* specify all ports that really exist (in hardware) at compile time
|
|
|
709 |
* and enable only these you want to use.
|
|
|
710 |
*
|
|
|
711 |
* @param ttyS Port to use; corresponding to internal numbering scheme.
|
|
|
712 |
* @param port port address, if zero, use standard value from rt_com_table
|
|
|
713 |
* @param irq irq address, if zero, use standard value from rt_com_table
|
|
|
714 |
* @return 0 everything all right,
|
|
|
715 |
* -ENODEV no entry in rt_com_table for that device,
|
|
|
716 |
* -EBUSY port-region is used already.
|
|
|
717 |
*
|
|
|
718 |
* @author Roberto Finazzi, Jochen Kupper
|
|
|
719 |
* @version 2000/03/10 */
|
|
|
720 |
int rt_com_hwsetup(unsigned int ttyS, int port, int irq)
|
|
|
721 |
{
|
|
|
722 |
if (ttyS < RT_COM_CNT) {
|
|
|
723 |
struct rt_com_struct *p = &(rt_com_table[ttyS]);
|
|
|
724 |
if (0 == p->used) {
|
|
|
725 |
if (0 != port)
|
|
|
726 |
p->port = port;
|
|
|
727 |
if (0 != irq)
|
|
|
728 |
p->irq = irq;
|
|
|
729 |
if (-EBUSY == check_region(p->port, 8)) {
|
|
|
730 |
return(-EBUSY);
|
|
|
731 |
}
|
|
|
732 |
|
|
|
733 |
request_region(p->port, 8, RT_COM_NAME);
|
|
|
734 |
rt_com_request_irq(p->irq, p->isr);
|
|
|
735 |
p->used = 1;
|
|
|
736 |
rt_com_setup(ttyS, p->baud, p->mode, p->parity, p->stopbits, p->wordlength, p->fifotrig);
|
|
|
737 |
return(0);
|
|
|
738 |
}
|
|
|
739 |
else {
|
|
|
740 |
if (port >= 0)
|
|
|
741 |
return(-EBUSY);
|
|
|
742 |
rt_com_setup(ttyS, 0, 0, 0, 0, 0, 0);
|
|
|
743 |
rt_com_free_irq(p->irq);
|
|
|
744 |
release_region(p->port, 8);
|
|
|
745 |
p->used = 0;
|
|
|
746 |
return(0);
|
|
|
747 |
}
|
|
|
748 |
}
|
|
|
749 |
|
|
|
750 |
return(-ENODEV);
|
|
|
751 |
}
|
|
|
752 |
|
|
|
753 |
/** Initialization
|
|
|
754 |
*
|
|
|
755 |
* For all ports that have a used flag greater than 0, request port
|
|
|
756 |
* memory and register ISRs. If we cannot get the memory of all these
|
|
|
757 |
* ports, release all already requested ports and return an error.
|
|
|
758 |
*
|
|
|
759 |
* @return Success status, zero on success. With a non-zero return
|
|
|
760 |
* value of this routine, insmod will fail to load the module !
|
|
|
761 |
*
|
|
|
762 |
* @author Jochen Kupper, Hua Mao, Roberto Finazzi
|
|
|
763 |
* @version 2000/03/10 */
|
|
|
764 |
//int init_module(void) //Hm, IgH
|
|
|
765 |
int init_aip_com(void)
|
|
|
766 |
{
|
|
|
767 |
int errorcode = 0;
|
|
|
768 |
unsigned int i, j;
|
|
|
769 |
|
|
|
770 |
printk(KERN_INFO "rt_com: Loading real-time serial port driver (version "VERSION ").\n");
|
|
|
771 |
|
|
|
772 |
for (i = 0; i < RT_COM_CNT; i++) {
|
|
|
773 |
struct rt_com_struct *p = &(rt_com_table[i]);
|
|
|
774 |
|
|
|
775 |
// if used set default values
|
|
|
776 |
if (p->used > 0) {
|
|
|
777 |
printk(KERN_WARNING "RS232 testing %d\n",i);
|
|
|
778 |
if (-EBUSY == check_region(p->port, 8)) {
|
|
|
779 |
errorcode = -EBUSY;
|
|
|
780 |
printk(KERN_WARNING "rt_com: error %d: cannot request port region %x\n", errorcode, p->port);
|
|
|
781 |
break;
|
|
|
782 |
}
|
|
|
783 |
|
|
|
784 |
request_region(p->port, 8, "rt_com");
|
|
|
785 |
rt_com_request_irq(p->irq, p->isr);
|
|
|
786 |
printk(KERN_WARNING "RS232 Request IRQ: %d\n",p->irq);
|
|
|
787 |
rt_com_setup(i, p->baud, p->mode, p->parity, p->stopbits, p->wordlength, p->fifotrig);
|
|
|
788 |
}
|
|
|
789 |
}
|
|
|
790 |
|
|
|
791 |
if (0 != errorcode) {
|
|
|
792 |
printk(KERN_WARNING "rt_com: giving up.\n");
|
|
|
793 |
for (j = 0; j < i; j++) {
|
|
|
794 |
struct rt_com_struct *p = &(rt_com_table[j]);
|
|
|
795 |
if (0 < p->used) {
|
|
|
796 |
rt_com_free_irq(p->irq);
|
|
|
797 |
release_region(p->port, 8);
|
|
|
798 |
}
|
|
|
799 |
}
|
|
|
800 |
}
|
|
|
801 |
else {
|
|
|
802 |
printk(KERN_INFO "rt_com: sucessfully loaded.\n");
|
|
|
803 |
}
|
|
|
804 |
|
|
|
805 |
return(errorcode);
|
|
|
806 |
}
|
|
|
807 |
|
|
|
808 |
/** Cleanup
|
|
|
809 |
*
|
|
|
810 |
* Unregister ISR and releases memory for all ports
|
|
|
811 |
*
|
|
|
812 |
* @author Jochen Kupper
|
|
|
813 |
* @version 1999/10/01 */
|
|
|
814 |
//void cleanup_module(void) Hm, IgH
|
|
|
815 |
void cleanup_aip_com(void)
|
|
|
816 |
{
|
|
|
817 |
int i;
|
|
|
818 |
for (i = 0; i < RT_COM_CNT; i++) {
|
|
|
819 |
struct rt_com_struct *p = &(rt_com_table[i]);
|
|
|
820 |
if (0 < p->used) {
|
|
|
821 |
rt_com_free_irq(p->irq);
|
|
|
822 |
rt_com_setup(i, 0, 0, 0, 0, 0, 0);
|
|
|
823 |
release_region(p->port, 8);
|
|
|
824 |
}
|
|
|
825 |
}
|
|
|
826 |
|
|
|
827 |
printk(KERN_INFO "rt_com: unloaded.\n");
|
|
|
828 |
}
|
|
|
829 |
|
|
|
830 |
/*
|
|
|
831 |
EXPORT_SYMBOL(rt_com_buffersize);
|
|
|
832 |
EXPORT_SYMBOL(rt_com_clear_input);
|
|
|
833 |
EXPORT_SYMBOL(rt_com_clear_output);
|
|
|
834 |
EXPORT_SYMBOL(rt_com_error);
|
|
|
835 |
EXPORT_SYMBOL(rt_com_hwsetup);
|
|
|
836 |
EXPORT_SYMBOL(rt_com_read);
|
|
|
837 |
EXPORT_SYMBOL(rt_com_read_modem);
|
|
|
838 |
EXPORT_SYMBOL(rt_com_setup);
|
|
|
839 |
EXPORT_SYMBOL(rt_com_table);
|
|
|
840 |
EXPORT_SYMBOL(rt_com_write);
|
|
|
841 |
EXPORT_SYMBOL(rt_com_write_modem);
|
|
|
842 |
EXPORT_SYMBOL(rt_com_set_mode);
|
|
|
843 |
EXPORT_SYMBOL(rt_com_set_fifotrig);
|
|
|
844 |
*/
|
|
|
845 |
|
|
|
846 |
/**
|
|
|
847 |
* Local Variables:
|
|
|
848 |
* mode: C
|
|
|
849 |
* c-file-style: "Stroustrup"
|
|
|
850 |
* End:
|
|
|
851 |
*/
|