| author | Florian Pose <fp@igh-essen.com> |
| Fri, 18 Nov 2005 09:35:04 +0000 | |
| changeset 16 | f04e93b8af0f |
| parent 5 | 6f2508af550c |
| permissions | -rw-r--r-- |
| 0 | 1 |
/** 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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||
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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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||
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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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/* 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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||
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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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||
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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 {
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struct rt_buf_struct *b = &(p->obuf); |
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long state; |
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int bytestosend; |
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if (count == 0) |
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return(0); |
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bytestosend = rt_com_buffer_free(b->head, b->tail); |
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if (count < 0) {
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count = -count; |
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if (count > bytestosend) |
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return(count); |
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bytestosend = count; |
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} |
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else {
|
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if (count <= bytestosend) |
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bytestosend = count; |
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} |
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||
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rt_com_irq_off(state); |
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while (bytestosend-- > 0) {
|
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/* put byte into buffer, move pointers to next elements */ |
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b->buf[b->head++] = *buffer++; |
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if (b->head >= rt_com_buffersize) |
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b->head = 0; |
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--count; |
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} |
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||
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p->ier |= IER_ETBEI; |
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outb(p->ier, p->port + RT_COM_IER); |
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rt_com_irq_on(state); |
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return(count); |
|
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} |
|
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} |
|
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} |
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||
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/** Read data we got from 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 buffer. Needs to be of size > cnt ! |
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* @param count Number of bytes to read. |
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* @return Number of bytes actually read. |
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* |
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* @author Jens Michaelsen, Jochen Kupper |
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* @version 2000/03/17 */ |
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int rt_com_read(unsigned int ttyS, char *buffer, int count) |
|
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{
|
|
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if (0 > count) {
|
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return(-EINVAL); |
|
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} |
|
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else 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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403 |
if (!(p->used & RT_COM_PORT_SETUP)) {
|
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return(-EPERM); |
|
405 |
} |
|
406 |
else {
|
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407 |
struct rt_buf_struct *b = &(p->ibuf); |
|
408 |
int done = 0; |
|
409 |
long state; |
|
410 |
rt_com_irq_off(state); |
|
411 |
while ((b->head != b->tail) && (--count >= 0)) {
|
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412 |
done++; |
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413 |
*buffer++ = b->buf[b->tail++]; |
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414 |
b->tail &= (RT_COM_BUF_SIZ - 1); |
|
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} |
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||
417 |
rt_com_irq_on(state); |
|
418 |
if ((p->mode & RT_COM_HW_FLOW) && (rt_com_buffer_free(b->head, b->tail) > RT_COM_BUF_HI)) {
|
|
419 |
/* if hardware flow and enough free space on input buffer |
|
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then set RTS */ |
|
421 |
p->mcr |= MCR_RTS; |
|
422 |
outb(p->mcr, p->port + RT_COM_MCR); |
|
423 |
} |
|
424 |
||
425 |
return(done); |
|
426 |
} |
|
427 |
} |
|
428 |
} |
|
429 |
||
430 |
/** Get first byte from the write buffer. |
|
431 |
* |
|
432 |
* @param p rt_com_struct of the line we are writing to. |
|
433 |
* @param c Address to put the char in. |
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434 |
* @return Number of characters we actually got. |
|
435 |
* |
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436 |
* @author Jens Michaelsen, Jochen Kupper |
|
437 |
* @version 1999/10/01 |
|
438 |
*/ |
|
439 |
static inline int rt_com_irq_get(struct rt_com_struct *p, unsigned char *c) |
|
440 |
{
|
|
441 |
struct rt_buf_struct *b = &(p->obuf); |
|
442 |
if (b->head != b->tail) {
|
|
443 |
*c = b->buf[b->tail++]; |
|
444 |
b->tail &= (RT_COM_BUF_SIZ - 1); |
|
445 |
return(1); |
|
446 |
} |
|
447 |
||
448 |
return(0); |
|
449 |
} |
|
450 |
||
451 |
/** Concatenate a byte to the read buffer. |
|
452 |
* |
|
453 |
* @param p rt_com_struct of the line we are writing to. |
|
454 |
* @param ch Byte to put into buffer. |
|
455 |
* |
|
456 |
* @author Jens Michaelsen, Jochen Kupper |
|
457 |
* @version 1999/07/20 */ |
|
458 |
static inline void rt_com_irq_put(struct rt_com_struct *p, unsigned char ch) |
|
459 |
{
|
|
460 |
struct rt_buf_struct *b = &(p->ibuf); |
|
461 |
b->buf[b->head++] = ch; |
|
462 |
b->head &= (RT_COM_BUF_SIZ - 1); |
|
463 |
} |
|
464 |
||
465 |
/** Real interrupt handler. |
|
466 |
* |
|
467 |
* This one is called by the registered ISRs and does the actual work. |
|
468 |
* |
|
469 |
* @param ttyS Port to use corresponding to internal numbering scheme. |
|
470 |
* |
|
471 |
* @author Jens Michaelsen, Jochen Kupper, Hua Mao, Roberto Finazzi |
|
472 |
* @version 2000/03/17 */ |
|
473 |
static inline int rt_com_isr(unsigned int ttyS) |
|
474 |
{
|
|
475 |
struct rt_com_struct *p = &(rt_com_table[ttyS]); |
|
476 |
struct rt_buf_struct *b = &(p->ibuf); |
|
477 |
unsigned int base = p->port; |
|
478 |
int buff, data_to_tx; |
|
479 |
int loop = 4; |
|
480 |
int toFifo = 16; |
|
481 |
unsigned char data, msr, lsr, iir; |
|
482 |
||
483 |
do {
|
|
484 |
//iir=inb(base + RT_COM_IIR); |
|
485 |
//rt_printk("iir=0x%02x\n",iir);
|
|
486 |
/* get available data from port */ |
|
487 |
lsr = inb(base + RT_COM_LSR); |
|
488 |
if (0x1e & lsr) |
|
489 |
p->error = lsr & 0x1e; |
|
490 |
while (LSR_DATA_READY & lsr) {
|
|
491 |
data = inb(base + RT_COM_RXB); |
|
492 |
||
493 |
//rt_printk("[%02x<- ",data);
|
|
494 |
rt_com_irq_put(p, data); |
|
495 |
lsr = inb(base + RT_COM_LSR); |
|
496 |
if (0x1e & lsr) |
|
497 |
p->error = 0x1e & lsr; |
|
498 |
} |
|
499 |
||
500 |
/* controls on buffer full and RTS clear on hardware flow |
|
501 |
control */ |
|
502 |
buff = rt_com_buffer_free(b->head, b->tail); |
|
503 |
if (buff < RT_COM_BUF_FULL) |
|
504 |
p->error = RT_COM_BUFFER_FULL; |
|
505 |
||
506 |
if ((p->mode & RT_COM_HW_FLOW) && (buff < RT_COM_BUF_LOW)) {
|
|
507 |
p->mcr &= ~MCR_RTS; |
|
508 |
outb(p->mcr, p->port + RT_COM_MCR); |
|
509 |
} |
|
510 |
||
511 |
/* if possible, put data to port */ |
|
512 |
msr = inb(base + RT_COM_MSR); |
|
513 |
if |
|
514 |
( |
|
515 |
(p->mode == RT_COM_NO_HAND_SHAKE) || |
|
516 |
((p->mode & RT_COM_DSR_ON_TX) && (MSR_DSR & msr) && (p->mode & RT_COM_HW_FLOW) && (MSR_CTS & msr)) |
|
517 |
) {
|
|
518 |
/* (DSR && (CTS || Mode==no hw flow)) or Mode==no handshake */ |
|
519 |
// if (THRE==1) i.e. transmitter empty |
|
520 |
if ((lsr = inb(base + RT_COM_LSR)) & LSR_THRE) {
|
|
521 |
// if there are data to transmit |
|
522 |
if ((data_to_tx = rt_com_irq_get(p, &data)) != 0) {
|
|
523 |
do {
|
|
524 |
//rt_printk("->%02x] ",data);
|
|
525 |
outb(data, base + RT_COM_TXB); |
|
526 |
} while ((--toFifo > 0) && (data_to_tx = rt_com_irq_get(p, &data) != 0)); |
|
527 |
} |
|
528 |
||
529 |
if (!data_to_tx) {
|
|
530 |
/* no data in output buffer, disable Transmitter |
|
531 |
Holding Register Empty Interrupt */ |
|
532 |
p->ier &= ~IER_ETBEI; |
|
533 |
outb(p->ier, base + RT_COM_IER); |
|
534 |
} |
|
535 |
} |
|
536 |
} |
|
537 |
||
538 |
/* check the low nibble of IIR wheather there is another pending |
|
539 |
interrupt. bit 0 = 0 if interrupt pending, bits 1,2,3 |
|
540 |
are the interrupt ID */ |
|
541 |
iir = inb(base + RT_COM_IIR); |
|
542 |
} while (((iir & 0x0F) != 1) && (--loop > 0)); |
|
543 |
||
544 |
#if defined RTLINUX_V2 |
|
545 |
rtl_hard_enable_irq(p->irq); |
|
546 |
#endif |
|
547 |
return 0; |
|
548 |
} |
|
549 |
||
550 |
/** Interrupt Service Routines |
|
551 |
* |
|
552 |
* These are the Interrupt Service Routines to be registered with the |
|
553 |
* OS. They simply call the genereric interrupt handler for the |
|
554 |
* current port to do the work. |
|
555 |
* |
|
556 |
* @author Jens Michaelsen, Jochen Kupper, Hua Mao |
|
557 |
* @version 1999/11/11 */ |
|
558 |
static void rt_com0_isr(void) |
|
559 |
{
|
|
560 |
//rt_printk("rt_com0_isr\n");
|
|
561 |
rt_com_isr(0); |
|
562 |
} |
|
563 |
||
564 |
static void rt_com1_isr(void) |
|
565 |
{
|
|
566 |
//rt_printk("rt_com1_isr\n");
|
|
567 |
rt_com_isr(1); |
|
568 |
} |
|
569 |
||
570 |
/** Setup one port |
|
571 |
* |
|
572 |
* Calls from init_module + cleanup_module have baud == 0; in these |
|
573 |
* cases we only do some cleanup. |
|
574 |
* |
|
575 |
* To allocate a port, give usefull setup parameter, to deallocate |
|
576 |
* give negative baud. |
|
577 |
* |
|
578 |
* @param ttyS Number corresponding to internal port numbering scheme. |
|
579 |
* This is esp. the index of the rt_com_table to use. |
|
580 |
* @param baud Data transmission rate to use [Byte/s]. If negative, |
|
581 |
* deallocate port instead. Called with baud == 0 from |
|
582 |
* init_module for basic initialization. Needs to be called |
|
583 |
* by user-task again before use ! |
|
584 |
* @param mode see rt_com_set_mode docs for now |
|
585 |
* @param parity Parity for transmission protocol. |
|
586 |
* (RT_COM_PARITY_EVEN, RT_COM_PARITY_ODD, RT_COM_PARITY_NONE) |
|
587 |
* @param stopbits Number of stopbits to use. 1 gives you one stopbit, 2 |
|
588 |
* actually gives really two stopbits for wordlengths of |
|
589 |
* 6 - 8 bit, but 1.5 stopbits for a wordlength of 5 bits. |
|
590 |
* @param wordlength Number of bits per word (5 - 8 bits). |
|
591 |
* @param fifotrig if <0 set trigger fifo using default value set |
|
592 |
* in rt_com_table[], otherwise set trigger fifo accordingly |
|
593 |
* to the parameter |
|
594 |
* @return 0 - all right |
|
595 |
* -ENODEV - no entry for that ttyS in rt_com_table |
|
596 |
* -EPERM - get hardware resources first (the port needs to |
|
597 |
* be setup hardware-wise first, that means you have |
|
598 |
* to specify a positive used flag at compile time |
|
599 |
* or call rt_com_set_hwparm first.) |
|
600 |
* |
|
601 |
* @author Jens Michaelsen, Jochen Kupper, Roberto Finazzi |
|
602 |
* @version 2000/03/12 */ |
|
603 |
int rt_com_setup |
|
604 |
( |
|
605 |
unsigned int ttyS, |
|
606 |
int baud, |
|
607 |
int mode, |
|
608 |
unsigned int parity, |
|
609 |
unsigned int stopbits, |
|
610 |
unsigned int wordlength, |
|
611 |
int fifotrig |
|
612 |
) |
|
613 |
{
|
|
614 |
if (ttyS >= RT_COM_CNT) {
|
|
615 |
return(-ENODEV); |
|
616 |
} |
|
617 |
else {
|
|
618 |
struct rt_com_struct *p = &(rt_com_table[ttyS]); |
|
619 |
if (0 == p->used) {
|
|
620 |
/* */ |
|
621 |
return(-EPERM); |
|
622 |
} |
|
623 |
else {
|
|
624 |
unsigned int base = p->port; |
|
625 |
||
626 |
/* Stop everything, set DLAB */ |
|
627 |
outb(0x00, base + RT_COM_IER); |
|
628 |
outb(0x80, base + RT_COM_LCR); |
|
629 |
||
630 |
/* clear irqs */ |
|
631 |
inb(base + RT_COM_IIR); |
|
632 |
inb(base + RT_COM_LSR); |
|
633 |
inb(base + RT_COM_RXB); |
|
634 |
inb(base + RT_COM_MSR); |
|
635 |
||
636 |
/* initialize error code */ |
|
637 |
p->error = 0; |
|
638 |
||
639 |
/* if 0 == baud, nothing else to do ! */ |
|
640 |
if (baud == 0) |
|
641 |
return(0); |
|
642 |
||
643 |
if (0 > baud) {
|
|
644 |
/* free the port */ |
|
645 |
/* disable interrupts */ |
|
646 |
outb(0, base + RT_COM_IER); |
|
647 |
//MOD_DEC_USE_COUNT; Hm, IgH |
|
648 |
return(0); |
|
649 |
} |
|
650 |
else {
|
|
651 |
/* allocate and set-up the port */ |
|
652 |
unsigned int divider = p->baud_base / baud; |
|
653 |
||
654 |
//MOD_INC_USE_COUNT; Hm, IgH |
|
655 |
||
656 |
/* set transfer rate */ |
|
657 |
outb(divider % 256, base + RT_COM_DLL); |
|
658 |
outb(divider / 256, base + RT_COM_DLM); |
|
659 |
||
660 |
/* bits 3,4 + 5 determine parity, mask away anything else */ |
|
661 |
parity &= 0x38; |
|
662 |
||
663 |
/* set transmission parameters and clear DLAB */ |
|
664 |
outb((wordlength - 5) | ((stopbits - 1) << 2) | parity, base + RT_COM_LCR); |
|
665 |
||
666 |
/* set-up MCR value and write it */ |
|
667 |
p->mcr = MCR_DTR | MCR_RTS | MCR_OUT1 | MCR_OUT2; |
|
668 |
outb(p->mcr, base + RT_COM_MCR); |
|
669 |
||
670 |
/* set-up IER value and write it */ |
|
671 |
p->mode = mode; |
|
672 |
if (p->mode == RT_COM_NO_HAND_SHAKE) {
|
|
673 |
/* if no handshaking signals enable only receiver interrupts */ |
|
674 |
p->ier = IER_ERBI | IER_ELSI; |
|
675 |
} |
|
676 |
else {
|
|
677 |
/* enable receiver and modem interrupts */ |
|
678 |
p->ier = IER_ERBI | IER_ELSI | IER_EDSSI; |
|
679 |
} |
|
680 |
||
681 |
outb(p->ier, base + RT_COM_IER); |
|
682 |
if (fifotrig>=0) |
|
683 |
p->fifotrig = fifotrig; |
|
684 |
outb(FCR_FIFO_ENABLE | p->fifotrig, base + RT_COM_FCR); // enable fifo |
|
685 |
/* mark setup done */ |
|
686 |
p->used |= RT_COM_PORT_SETUP; |
|
687 |
return(0); |
|
688 |
} |
|
689 |
} |
|
690 |
||
691 |
return(0); |
|
692 |
} |
|
693 |
} |
|
694 |
||
695 |
/** Set hardware parameter for a specific port. |
|
696 |
* |
|
697 |
* Change port address and irq setting for a specified port. The port |
|
698 |
* must have an entry in rt_com_table beforehand. |
|
699 |
* |
|
700 |
* To allow the specification of additional ports we would need to |
|
701 |
* dynamically allocate memory, that's not really feasible within a |
|
702 |
* real-time context, although we could preallocate a few entries in |
|
703 |
* init_module. However, it doesn't make too much sense, as you can |
|
704 |
* specify all ports that really exist (in hardware) at compile time |
|
705 |
* and enable only these you want to use. |
|
706 |
* |
|
707 |
* @param ttyS Port to use; corresponding to internal numbering scheme. |
|
708 |
* @param port port address, if zero, use standard value from rt_com_table |
|
709 |
* @param irq irq address, if zero, use standard value from rt_com_table |
|
710 |
* @return 0 everything all right, |
|
711 |
* -ENODEV no entry in rt_com_table for that device, |
|
712 |
* -EBUSY port-region is used already. |
|
713 |
* |
|
714 |
* @author Roberto Finazzi, Jochen Kupper |
|
715 |
* @version 2000/03/10 */ |
|
716 |
int rt_com_hwsetup(unsigned int ttyS, int port, int irq) |
|
717 |
{
|
|
718 |
if (ttyS < RT_COM_CNT) {
|
|
719 |
struct rt_com_struct *p = &(rt_com_table[ttyS]); |
|
720 |
if (0 == p->used) {
|
|
721 |
if (0 != port) |
|
722 |
p->port = port; |
|
723 |
if (0 != irq) |
|
724 |
p->irq = irq; |
|
725 |
if (-EBUSY == check_region(p->port, 8)) {
|
|
726 |
return(-EBUSY); |
|
727 |
} |
|
728 |
||
729 |
request_region(p->port, 8, RT_COM_NAME); |
|
730 |
rt_com_request_irq(p->irq, p->isr); |
|
731 |
p->used = 1; |
|
732 |
rt_com_setup(ttyS, p->baud, p->mode, p->parity, p->stopbits, p->wordlength, p->fifotrig); |
|
733 |
return(0); |
|
734 |
} |
|
735 |
else {
|
|
736 |
if (port >= 0) |
|
737 |
return(-EBUSY); |
|
738 |
rt_com_setup(ttyS, 0, 0, 0, 0, 0, 0); |
|
739 |
rt_com_free_irq(p->irq); |
|
740 |
release_region(p->port, 8); |
|
741 |
p->used = 0; |
|
742 |
return(0); |
|
743 |
} |
|
744 |
} |
|
745 |
||
746 |
return(-ENODEV); |
|
747 |
} |
|
748 |
||
749 |
/** Initialization |
|
750 |
* |
|
751 |
* For all ports that have a used flag greater than 0, request port |
|
752 |
* memory and register ISRs. If we cannot get the memory of all these |
|
753 |
* ports, release all already requested ports and return an error. |
|
754 |
* |
|
755 |
* @return Success status, zero on success. With a non-zero return |
|
756 |
* value of this routine, insmod will fail to load the module ! |
|
757 |
* |
|
758 |
* @author Jochen Kupper, Hua Mao, Roberto Finazzi |
|
759 |
* @version 2000/03/10 */ |
|
760 |
//int init_module(void) //Hm, IgH |
|
761 |
int init_aip_com(void) |
|
762 |
{
|
|
763 |
int errorcode = 0; |
|
764 |
unsigned int i, j; |
|
765 |
||
766 |
printk(KERN_INFO "rt_com: Loading real-time serial port driver (version "VERSION ").\n"); |
|
767 |
||
768 |
for (i = 0; i < RT_COM_CNT; i++) {
|
|
769 |
struct rt_com_struct *p = &(rt_com_table[i]); |
|
770 |
||
771 |
// if used set default values |
|
772 |
if (p->used > 0) {
|
|
773 |
printk(KERN_WARNING "RS232 testing %d\n",i); |
|
774 |
if (-EBUSY == check_region(p->port, 8)) {
|
|
775 |
errorcode = -EBUSY; |
|
776 |
printk(KERN_WARNING "rt_com: error %d: cannot request port region %x\n", errorcode, p->port); |
|
777 |
break; |
|
778 |
} |
|
779 |
||
780 |
request_region(p->port, 8, "rt_com"); |
|
781 |
rt_com_request_irq(p->irq, p->isr); |
|
782 |
printk(KERN_WARNING "RS232 Request IRQ: %d\n",p->irq); |
|
783 |
rt_com_setup(i, p->baud, p->mode, p->parity, p->stopbits, p->wordlength, p->fifotrig); |
|
784 |
} |
|
785 |
} |
|
786 |
||
787 |
if (0 != errorcode) {
|
|
788 |
printk(KERN_WARNING "rt_com: giving up.\n"); |
|
789 |
for (j = 0; j < i; j++) {
|
|
790 |
struct rt_com_struct *p = &(rt_com_table[j]); |
|
791 |
if (0 < p->used) {
|
|
792 |
rt_com_free_irq(p->irq); |
|
793 |
release_region(p->port, 8); |
|
794 |
} |
|
795 |
} |
|
796 |
} |
|
797 |
else {
|
|
798 |
printk(KERN_INFO "rt_com: sucessfully loaded.\n"); |
|
799 |
} |
|
800 |
||
801 |
return(errorcode); |
|
802 |
} |
|
803 |
||
804 |
/** Cleanup |
|
805 |
* |
|
806 |
* Unregister ISR and releases memory for all ports |
|
807 |
* |
|
808 |
* @author Jochen Kupper |
|
809 |
* @version 1999/10/01 */ |
|
810 |
//void cleanup_module(void) Hm, IgH |
|
811 |
void cleanup_aip_com(void) |
|
812 |
{
|
|
|
5
6f2508af550c
Alle ?nderungen aus den Branches no_rtai und no_int nach Trunk portiert.
Florian Pose <fp@igh-essen.com>
parents:
0
diff
changeset
|
813 |
unsigned int i; |
| 0 | 814 |
for (i = 0; i < RT_COM_CNT; i++) {
|
815 |
struct rt_com_struct *p = &(rt_com_table[i]); |
|
816 |
if (0 < p->used) {
|
|
817 |
rt_com_free_irq(p->irq); |
|
818 |
rt_com_setup(i, 0, 0, 0, 0, 0, 0); |
|
819 |
release_region(p->port, 8); |
|
820 |
} |
|
821 |
} |
|
822 |
||
823 |
printk(KERN_INFO "rt_com: unloaded.\n"); |
|
824 |
} |
|
825 |
||
826 |
/* |
|
827 |
EXPORT_SYMBOL(rt_com_buffersize); |
|
828 |
EXPORT_SYMBOL(rt_com_clear_input); |
|
829 |
EXPORT_SYMBOL(rt_com_clear_output); |
|
830 |
EXPORT_SYMBOL(rt_com_error); |
|
831 |
EXPORT_SYMBOL(rt_com_hwsetup); |
|
832 |
EXPORT_SYMBOL(rt_com_read); |
|
833 |
EXPORT_SYMBOL(rt_com_read_modem); |
|
834 |
EXPORT_SYMBOL(rt_com_setup); |
|
835 |
EXPORT_SYMBOL(rt_com_table); |
|
836 |
EXPORT_SYMBOL(rt_com_write); |
|
837 |
EXPORT_SYMBOL(rt_com_write_modem); |
|
838 |
EXPORT_SYMBOL(rt_com_set_mode); |
|
839 |
EXPORT_SYMBOL(rt_com_set_fifotrig); |
|
840 |
*/ |
|
841 |
||
842 |
/** |
|
843 |
* Local Variables: |
|
844 |
* mode: C |
|
845 |
* c-file-style: "Stroustrup" |
|
846 |
* End: |
|
847 |
*/ |