WebSVN – HelenOS – Diff – /trunk/kernel/arch/mips32/src/drivers/serial.c


/*
 * Copyright (c) 2005 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup mips32 
 * @{
 */
/** @file
 */
 
#include <interrupt.h>
#include <arch/cp0.h>
#include <arch/drivers/serial.h>
#include <console/chardev.h>
#include <console/console.h>
#include <ddi/irq.h>
 
#define SERIAL_IRQ 2
 
static irq_t serial_irq;
static chardev_t console;
static serial_t sconf[SERIAL_MAX];
static bool kb_enabled;
 
static void serial_write(chardev_t *d, const char ch)
{
    serial_t *sd = (serial_t *)d->data;
 
    if (ch == '\n')
        serial_write(d, '\r');
    /* Wait until transmit buffer empty */
    while (! (SERIAL_READ_LSR(sd->port) & (1<<TRANSMIT_EMPTY_BIT)))
        ;
    SERIAL_WRITE(sd->port, ch);
}
 
static void serial_enable(chardev_t *d)
{
    kb_enabled = true;
}
 
static void serial_disable(chardev_t *d)
{
    kb_enabled = false;
}
 
int serial_init(void)
{
    int i = 0;
    if (SERIAL_READ_LSR(SERIAL_COM1) == 0x60) {
        sconf[i].port = SERIAL_COM1;
        sconf[i].irq = SERIAL_COM1_IRQ;
        /* Enable interrupt on available data */
        i++;
    }
    return i;
}
 
/** Read character from serial port, wait until available */
static char serial_do_read(chardev_t *dev)
{
    serial_t *sd = (serial_t *)dev->data;
    char ch;
 
    while (!(SERIAL_READ_LSR(sd->port) & 1))
        ;
    ch = SERIAL_READ(sd->port);
 
    if (ch =='\r')
        ch = '\n';
    return ch;
}
 
static void serial_handler(void)
{
    serial_t *sd = (serial_t *) console.data;
    char ch;
 
    if (!(SERIAL_READ_LSR(sd->port) & 1))
        return;
    ch = SERIAL_READ(sd->port);
 
    if (ch =='\r')
        ch = '\n';
    chardev_push_character(&console, ch);
}
 
/** Process keyboard interrupt. Does not work in simics? */
static void serial_irq_handler(irq_t *irq, void *arg, ...)
{
    if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox))
        ipc_irq_send_notif(irq);
    else
        serial_handler();
}
 
static irq_ownership_t serial_claim(void)
{
    return IRQ_ACCEPT;
}
 
static chardev_operations_t serial_ops = {
    .resume = serial_enable,
    .suspend = serial_disable,
    .write = serial_write,
    .read = serial_do_read
};
 
void serial_console(devno_t devno)
{
    serial_t *sd = &sconf[0];
 
 
    chardev_initialize("serial_console", &console, &serial_ops);
    console.data = sd;
    kb_enabled = true;
   
    irq_initialize(&serial_irq);
    serial_irq.devno = devno;
    serial_irq.inr = SERIAL_IRQ;
    serial_irq.claim = serial_claim;
    serial_irq.handler = serial_irq_handler;
    irq_register(&serial_irq);
 
    /* I don't know why, but the serial interrupts simply
     * don't work on simics
     */
    virtual_timer_fnc = &serial_handler;
   
    stdin = &console;
    stdout = &console;
}
 
/** @}
 */
 

Rev 1955	Rev 2071
1	/*	1	/*
2	* Copyright (C) 2005 Ondrej Palkovsky	2	* Copyright (c) 2005 Ondrej Palkovsky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup mips32	29	/** @addtogroup mips32
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <interrupt.h>	35	#include <interrupt.h>
36	#include <arch/cp0.h>	36	#include <arch/cp0.h>
37	#include <arch/drivers/serial.h>	37	#include <arch/drivers/serial.h>
38	#include <console/chardev.h>	38	#include <console/chardev.h>
39	#include <console/console.h>	39	#include <console/console.h>
40	#include <ddi/irq.h>	40	#include <ddi/irq.h>
41		41
42	#define SERIAL_IRQ 2	42	#define SERIAL_IRQ 2
43		43
44	static irq_t serial_irq;	44	static irq_t serial_irq;
45	static chardev_t console;	45	static chardev_t console;
46	static serial_t sconf[SERIAL_MAX];	46	static serial_t sconf[SERIAL_MAX];
47	static bool kb_enabled;	47	static bool kb_enabled;
48		48
49	static void serial_write(chardev_t *d, const char ch)	49	static void serial_write(chardev_t *d, const char ch)
50	{	50	{
51	serial_t sd = (serial_t )d->data;	51	serial_t sd = (serial_t )d->data;
52		52
53	if (ch == '\n')	53	if (ch == '\n')
54	serial_write(d, '\r');	54	serial_write(d, '\r');
55	/* Wait until transmit buffer empty */	55	/* Wait until transmit buffer empty */
56	while (! (SERIAL_READ_LSR(sd->port) & (1<<TRANSMIT_EMPTY_BIT)))	56	while (! (SERIAL_READ_LSR(sd->port) & (1<<TRANSMIT_EMPTY_BIT)))
57	;	57	;
58	SERIAL_WRITE(sd->port, ch);	58	SERIAL_WRITE(sd->port, ch);
59	}	59	}
60		60
61	static void serial_enable(chardev_t *d)	61	static void serial_enable(chardev_t *d)
62	{	62	{
63	kb_enabled = true;	63	kb_enabled = true;
64	}	64	}
65		65
66	static void serial_disable(chardev_t *d)	66	static void serial_disable(chardev_t *d)
67	{	67	{
68	kb_enabled = false;	68	kb_enabled = false;
69	}	69	}
70		70
71	int serial_init(void)	71	int serial_init(void)
72	{	72	{
73	int i = 0;	73	int i = 0;
74	if (SERIAL_READ_LSR(SERIAL_COM1) == 0x60) {	74	if (SERIAL_READ_LSR(SERIAL_COM1) == 0x60) {
75	sconf[i].port = SERIAL_COM1;	75	sconf[i].port = SERIAL_COM1;
76	sconf[i].irq = SERIAL_COM1_IRQ;	76	sconf[i].irq = SERIAL_COM1_IRQ;
77	/* Enable interrupt on available data */	77	/* Enable interrupt on available data */
78	i++;	78	i++;
79	}	79	}
80	return i;	80	return i;
81	}	81	}
82		82
83	/** Read character from serial port, wait until available */	83	/** Read character from serial port, wait until available */
84	static char serial_do_read(chardev_t *dev)	84	static char serial_do_read(chardev_t *dev)
85	{	85	{
86	serial_t sd = (serial_t )dev->data;	86	serial_t sd = (serial_t )dev->data;
87	char ch;	87	char ch;
88		88
89	while (!(SERIAL_READ_LSR(sd->port) & 1))	89	while (!(SERIAL_READ_LSR(sd->port) & 1))
90	;	90	;
91	ch = SERIAL_READ(sd->port);	91	ch = SERIAL_READ(sd->port);
92		92
93	if (ch =='\r')	93	if (ch =='\r')
94	ch = '\n';	94	ch = '\n';
95	return ch;	95	return ch;
96	}	96	}
97		97
98	static void serial_handler(void)	98	static void serial_handler(void)
99	{	99	{
100	serial_t sd = (serial_t ) console.data;	100	serial_t sd = (serial_t ) console.data;
101	char ch;	101	char ch;
102		102
103	if (!(SERIAL_READ_LSR(sd->port) & 1))	103	if (!(SERIAL_READ_LSR(sd->port) & 1))
104	return;	104	return;
105	ch = SERIAL_READ(sd->port);	105	ch = SERIAL_READ(sd->port);
106		106
107	if (ch =='\r')	107	if (ch =='\r')
108	ch = '\n';	108	ch = '\n';
109	chardev_push_character(&console, ch);	109	chardev_push_character(&console, ch);
110	}	110	}
111		111
112	/** Process keyboard interrupt. Does not work in simics? */	112	/** Process keyboard interrupt. Does not work in simics? */
113	static void serial_irq_handler(irq_t irq, void arg, ...)	113	static void serial_irq_handler(irq_t irq, void arg, ...)
114	{	114	{
115	if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox))	115	if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox))
116	ipc_irq_send_notif(irq);	116	ipc_irq_send_notif(irq);
117	else	117	else
118	serial_handler();	118	serial_handler();
119	}	119	}
120		120
121	static irq_ownership_t serial_claim(void)	121	static irq_ownership_t serial_claim(void)
122	{	122	{
123	return IRQ_ACCEPT;	123	return IRQ_ACCEPT;
124	}	124	}
125		125
126	static chardev_operations_t serial_ops = {	126	static chardev_operations_t serial_ops = {
127	.resume = serial_enable,	127	.resume = serial_enable,
128	.suspend = serial_disable,	128	.suspend = serial_disable,
129	.write = serial_write,	129	.write = serial_write,
130	.read = serial_do_read	130	.read = serial_do_read
131	};	131	};
132		132
133	void serial_console(devno_t devno)	133	void serial_console(devno_t devno)
134	{	134	{
135	serial_t *sd = &sconf[0];	135	serial_t *sd = &sconf[0];
136		136
137		137
138	chardev_initialize("serial_console", &console, &serial_ops);	138	chardev_initialize("serial_console", &console, &serial_ops);
139	console.data = sd;	139	console.data = sd;
140	kb_enabled = true;	140	kb_enabled = true;
141		141
142	irq_initialize(&serial_irq);	142	irq_initialize(&serial_irq);
143	serial_irq.devno = devno;	143	serial_irq.devno = devno;
144	serial_irq.inr = SERIAL_IRQ;	144	serial_irq.inr = SERIAL_IRQ;
145	serial_irq.claim = serial_claim;	145	serial_irq.claim = serial_claim;
146	serial_irq.handler = serial_irq_handler;	146	serial_irq.handler = serial_irq_handler;
147	irq_register(&serial_irq);	147	irq_register(&serial_irq);
148		148
149	/* I don't know why, but the serial interrupts simply	149	/* I don't know why, but the serial interrupts simply
150	* don't work on simics	150	* don't work on simics
151	*/	151	*/
152	virtual_timer_fnc = &serial_handler;	152	virtual_timer_fnc = &serial_handler;
153		153
154	stdin = &console;	154	stdin = &console;
155	stdout = &console;	155	stdout = &console;
156	}	156	}
157		157
158	/** @}	158	/** @}
159	*/	159	*/
160		160

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(root)/trunk/kernel/arch/mips32/src/drivers/serial.c – Rev 1955 → 2071