1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2007 OpenMoko, Inc.
4 * Written by Harald Welte <laforge@openmoko.org>
5 */
6
7 /*
8 * Boot support
9 */
10 #include <common.h>
11 #include <command.h>
12 #include <stdio_dev.h>
13 #include <serial.h>
14
do_terminal(struct cmd_tbl * cmd,int flag,int argc,char * const argv[])15 int do_terminal(struct cmd_tbl *cmd, int flag, int argc, char *const argv[])
16 {
17 int last_tilde = 0;
18 struct stdio_dev *dev = NULL;
19
20 if (argc < 1)
21 return -1;
22
23 /* Scan for selected output/input device */
24 dev = stdio_get_by_name(argv[1]);
25 if (!dev)
26 return -1;
27
28 if (IS_ENABLED(CONFIG_SERIAL))
29 serial_reinit_all();
30
31 printf("Entering terminal mode for port %s\n", dev->name);
32 puts("Use '~.' to leave the terminal and get back to u-boot\n");
33
34 while (1) {
35 int c;
36
37 /* read from console and display on serial port */
38 if (stdio_devices[0]->tstc(stdio_devices[0])) {
39 c = stdio_devices[0]->getc(stdio_devices[0]);
40 if (last_tilde == 1) {
41 if (c == '.') {
42 putc(c);
43 putc('\n');
44 break;
45 } else {
46 last_tilde = 0;
47 /* write the delayed tilde */
48 dev->putc(dev, '~');
49 /* fall-through to print current
50 * character */
51 }
52 }
53 if (c == '~') {
54 last_tilde = 1;
55 puts("[u-boot]");
56 putc(c);
57 }
58 dev->putc(dev, c);
59 }
60
61 /* read from serial port and display on console */
62 if (dev->tstc(dev)) {
63 c = dev->getc(dev);
64 putc(c);
65 }
66 }
67 return 0;
68 }
69
70
71 /***************************************************/
72
73 U_BOOT_CMD(
74 terminal, 3, 1, do_terminal,
75 "start terminal emulator",
76 ""
77 );
78