1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
* (c) 2009 Juergen Beisert <j.beisert@saschahauer.de>
*
* Based on code from:
* (c) 2004 Sascha Hauer <sascha@saschahauer.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <driver.h>
#include <init.h>
#include <malloc.h>
#include <asm/io.h>
#include <mach/s3c24xx-generic.h>
#include <mach/s3c24x0-iomap.h>
/* Note: Offsets are for little endian access */
#define ULCON 0x00 /* line control */
#define UCON 0x04 /* UART control */
#define UFCON 0x08 /* FIFO control */
#define UMCON 0x0c /* modem control */
#define UTRSTAT 0x10 /* Rx/Tx status */
#define UERSTAT 0x14 /* error status */
#define UFSTAT 0x18 /* FIFO status */
#define UMSTAT 0x1c /* modem status */
#define UTXH 0x20 /* transmitt */
#define URXH 0x24 /* receive */
#define UBRDIV 0x28 /* baudrate generator */
static int s3c24x0_serial_setbaudrate(struct console_device *cdev, int baudrate)
{
struct device_d *dev = cdev->dev;
unsigned val;
/* value is calculated so : PCLK / (16 * baudrate) -1 */
val = s3c24xx_get_pclk() / (16 * baudrate) - 1;
writew(val, dev->map_base + UBRDIV);
return 0;
}
static int s3c24x0_serial_init_port(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
/* FIFO enable, Tx/Rx FIFO clear */
writeb(0x07, dev->map_base + UFCON);
writeb(0x00, dev->map_base + UMCON);
/* Normal,No parity,1 stop,8 bit */
writeb(0x03, dev->map_base + ULCON);
/*
* tx=level,rx=edge,disable timeout int.,enable rx error int.,
* normal,interrupt or polling
*/
writew(0x0245, dev->map_base + UCON);
#ifdef CONFIG_DRIVER_SERIAL_S3C24X0_AUTOSYNC
writeb(0x01, dev->map_base + UMCON); /* RTS up */
#endif
return 0;
}
static void s3c24x0_serial_putc(struct console_device *cdev, char c)
{
struct device_d *dev = cdev->dev;
/* Wait for Tx FIFO not full */
while (!(readb(dev->map_base + UTRSTAT) & 0x2))
;
writeb(c, dev->map_base + UTXH);
}
static int s3c24x0_serial_tstc(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
/* If receive fifo is empty, return false */
if (readb(dev->map_base + UTRSTAT) & 0x1)
return 1;
return 0;
}
static int s3c24x0_serial_getc(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
/* wait for a character */
while (!(readb(dev->map_base + UTRSTAT) & 0x1))
;
return readb(dev->map_base + URXH);
}
static void s3c24x0_serial_flush(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
while (!(readb(dev->map_base + UTRSTAT) & 0x4))
;
}
static int s3c24x0_serial_probe(struct device_d *dev)
{
struct console_device *cdev;
cdev = xmalloc(sizeof(struct console_device));
dev->type_data = cdev;
cdev->dev = dev;
cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
cdev->tstc = s3c24x0_serial_tstc;
cdev->putc = s3c24x0_serial_putc;
cdev->getc = s3c24x0_serial_getc;
cdev->flush = s3c24x0_serial_flush;
cdev->setbrg = s3c24x0_serial_setbaudrate;
s3c24x0_serial_init_port(cdev);
/* Enable UART */
console_register(cdev);
return 0;
}
static void s3c24x0_serial_remove(struct device_d *dev)
{
struct console_device *cdev = dev->type_data;
s3c24x0_serial_flush(cdev);
free(cdev);
dev->type_data = NULL;
}
static struct driver_d s3c24x0_serial_driver = {
.name = "s3c24x0_serial",
.probe = s3c24x0_serial_probe,
.remove = s3c24x0_serial_remove,
};
static int s3c24x0_serial_init(void)
{
register_driver(&s3c24x0_serial_driver);
return 0;
}
console_initcall(s3c24x0_serial_init);
|
