1 /*
2  * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
3  * Scott McNutt <smcnutt@psyent.com>
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23 
24 #include <common.h>
25 #include <watchdog.h>
26 #include <asm/io.h>
27 #include <nios2-io.h>
28 
29 DECLARE_GLOBAL_DATA_PTR;
30 
31 /*------------------------------------------------------------------
32  * JTAG acts as the serial port
33  *-----------------------------------------------------------------*/
34 static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
35 
36 void serial_setbrg( void ){ return; }
37 int serial_init( void ) { return(0);}
38 
39 void serial_putc (char c)
40 {
41 	while (1) {
42 		unsigned st = readl(&jtag->control);
43 		if (NIOS_JTAG_WSPACE(st))
44 			break;
45 #ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
46 		if (!(st & NIOS_JTAG_AC)) /* no connection */
47 			return;
48 #endif
49 		WATCHDOG_RESET();
50 	}
51 	writel ((unsigned char)c, &jtag->data);
52 }
53 
54 void serial_puts (const char *s)
55 {
56 	while (*s != 0)
57 		serial_putc (*s++);
58 }
59 
60 int serial_tstc (void)
61 {
62 	return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
63 }
64 
65 int serial_getc (void)
66 {
67 	int c;
68 	unsigned val;
69 
70 	while (1) {
71 		WATCHDOG_RESET ();
72 		val = readl (&jtag->data);
73 		if (val & NIOS_JTAG_RVALID)
74 			break;
75 	}
76 	c = val & 0x0ff;
77 	return (c);
78 }
79