Merge branch 'master' of git://git.denx.de/u-boot-net
[platform/kernel/u-boot.git] / common / cmd_terminal.c
1 /*
2  * (C) Copyright 2007 OpenMoko, Inc.
3  * Written by Harald Welte <laforge@openmoko.org>
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 /*
25  * Boot support
26  */
27 #include <common.h>
28 #include <command.h>
29 #include <devices.h>
30 #include <serial.h>
31
32 int do_terminal(cmd_tbl_t * cmd, int flag, int argc, char *argv[])
33 {
34         int last_tilde = 0;
35         device_t *dev = NULL;
36
37         if (argc < 1)
38                 return -1;
39
40         /* Scan for selected output/input device */
41         dev = device_get_by_name(argv[1]);
42         if (!dev)
43                 return -1;
44
45         serial_reinit_all();
46         printf("Entering terminal mode for port %s\n", dev->name);
47         puts("Use '~.' to leave the terminal and get back to u-boot\n");
48
49         while (1) {
50                 int c;
51
52                 /* read from console and display on serial port */
53                 if (stdio_devices[0]->tstc()) {
54                         c = stdio_devices[0]->getc();
55                         if (last_tilde == 1) {
56                                 if (c == '.') {
57                                         putc(c);
58                                         putc('\n');
59                                         break;
60                                 } else {
61                                         last_tilde = 0;
62                                         /* write the delayed tilde */
63                                         dev->putc('~');
64                                         /* fall-through to print current
65                                          * character */
66                                 }
67                         }
68                         if (c == '~') {
69                                 last_tilde = 1;
70                                 puts("[u-boot]");
71                                 putc(c);
72                         }
73                         dev->putc(c);
74                 }
75
76                 /* read from serial port and display on console */
77                 if (dev->tstc()) {
78                         c = dev->getc();
79                         putc(c);
80                 }
81         }
82         return 0;
83 }
84
85
86 /***************************************************/
87
88 U_BOOT_CMD(
89         terminal,       3,      1,      do_terminal,
90         "start terminal emulator",
91         ""
92 );