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
|
/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 <watchdog.h>
#include <asm/io.h>
#include <nios2-io.h>
#include <linux/compiler.h>
#include <serial.h>
DECLARE_GLOBAL_DATA_PTR;
/*------------------------------------------------------------------
* UART the serial port
*-----------------------------------------------------------------*/
static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
/*
* Everything's already setup for fixed-baud PTF
* assignment
*/
static void altera_serial_setbrg(void)
{
}
static int altera_serial_init(void)
{
return 0;
}
#else
static void altera_serial_setbrg(void)
{
unsigned div;
div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
writel (div, &uart->divisor);
}
static int altera_serial_init(void)
{
serial_setbrg();
return 0;
}
#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
/*-----------------------------------------------------------------------
* UART CONSOLE
*---------------------------------------------------------------------*/
static void altera_serial_putc(char c)
{
if (c == '\n')
serial_putc ('\r');
while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
WATCHDOG_RESET ();
writel ((unsigned char)c, &uart->txdata);
}
static void altera_serial_puts(const char *s)
{
while (*s != 0) {
serial_putc (*s++);
}
}
static int altera_serial_tstc(void)
{
return (readl (&uart->status) & NIOS_UART_RRDY);
}
static int altera_serial_getc(void)
{
while (serial_tstc () == 0)
WATCHDOG_RESET ();
return (readl (&uart->rxdata) & 0x00ff );
}
#ifdef CONFIG_SERIAL_MULTI
static struct serial_device altera_serial_drv = {
.name = "altera_serial",
.start = altera_serial_init,
.stop = NULL,
.setbrg = altera_serial_setbrg,
.putc = altera_serial_putc,
.puts = altera_serial_puts,
.getc = altera_serial_getc,
.tstc = altera_serial_tstc,
};
void altera_serial_initialize(void)
{
serial_register(&altera_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &altera_serial_drv;
}
#else
int serial_init(void)
{
return altera_serial_init();
}
void serial_setbrg(void)
{
altera_serial_setbrg();
}
void serial_putc(const char c)
{
altera_serial_putc(c);
}
void serial_puts(const char *s)
{
altera_serial_puts(s);
}
int serial_getc(void)
{
return altera_serial_getc();
}
int serial_tstc(void)
{
return altera_serial_tstc();
}
#endif
|
