summaryrefslogtreecommitdiff
path: root/cpu/nios/serial.c
blob: 5ecdc6d7ea128ef8e831d8032656518d559496d2 (plain)
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
/*
 * (C) Copyright 2003, 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 <nios-io.h>

DECLARE_GLOBAL_DATA_PTR;

/*------------------------------------------------------------------
 * JTAG acts as the serial port
 *-----------------------------------------------------------------*/
#if defined(CONFIG_CONSOLE_JTAG)

static nios_jtag_t *jtag = (nios_jtag_t *)CFG_NIOS_CONSOLE;

void serial_setbrg( void ){ return; }
int serial_init( void ) { return(0);}

void serial_putc (char c)
{
	while ((jtag->txcntl & NIOS_JTAG_TRDY) != 0)
		WATCHDOG_RESET ();
	jtag->txcntl = NIOS_JTAG_TRDY | (unsigned char)c;
}

void serial_puts (const char *s)
{
	while (*s != 0)
		serial_putc (*s++);
}

int serial_tstc (void)
{
	return (jtag->rxcntl & NIOS_JTAG_RRDY);
}

int serial_getc (void)
{
	int c;
	while (serial_tstc() == 0)
		WATCHDOG_RESET ();
	c = jtag->rxcntl & 0x0ff;
	jtag->rxcntl = 0;
	return (c);
}

/*------------------------------------------------------------------
 * UART the serial port
 *-----------------------------------------------------------------*/
#else

static nios_uart_t *uart = (nios_uart_t *)CFG_NIOS_CONSOLE;

#if defined(CFG_NIOS_FIXEDBAUD)

/* Everything's already setup for fixed-baud PTF
 * assignment
 */
void serial_setbrg (void){ return; }
int serial_init (void) { return (0);}

#else

void serial_setbrg (void)
{
	unsigned div;

	div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
	uart->divisor = div;
	return;
}

int serial_init (void)
{
	serial_setbrg ();
	return (0);
}

#endif /* CFG_NIOS_FIXEDBAUD */


/*-----------------------------------------------------------------------
 * UART CONSOLE
 *---------------------------------------------------------------------*/
void serial_putc (char c)
{
	if (c == '\n')
		serial_putc ('\r');
	while ((uart->status & NIOS_UART_TRDY) == 0)
		WATCHDOG_RESET ();
	uart->txdata = (unsigned char)c;
}

void serial_puts (const char *s)
{
	while (*s != 0) {
		serial_putc (*s++);
	}
}

int serial_tstc (void)
{
	return (uart->status & NIOS_UART_RRDY);
}

int serial_getc (void)
{
	while (serial_tstc () == 0)
		WATCHDOG_RESET ();
	return( uart->rxdata & 0x00ff );
}

#endif /* CONFIG_JTAG_CONSOLE */