1 | /*===============================================================*\ |
---|
2 | | File: termios_printk.c | |
---|
3 | +-----------------------------------------------------------------+ |
---|
4 | | Copyright (c) 2002 IMD | |
---|
5 | | Ingenieurbuero fuer Microcomputertechnik Th. Doerfler | |
---|
6 | | Hebststr. 8, 82178 Puchheim, Germany | |
---|
7 | | <Thomas.Doerfler@imd-systems.de> | |
---|
8 | | The license and distribution terms for this file may be | |
---|
9 | | found in the file LICENSE in this distribution or at | |
---|
10 | | http://www.rtems.org/license/LICENSE. | |
---|
11 | | all rights reserved | |
---|
12 | +-----------------------------------------------------------------+ |
---|
13 | | TERMIOS printk support | |
---|
14 | | this module performs low-level printk output using | |
---|
15 | | a polled termios driver | |
---|
16 | | | |
---|
17 | +-----------------------------------------------------------------+ |
---|
18 | | date history ID | |
---|
19 | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
---|
20 | | 13.05.02 creation doe | |
---|
21 | |*****************************************************************| |
---|
22 | \*===============================================================*/ |
---|
23 | |
---|
24 | #ifdef HAVE_CONFIG_H |
---|
25 | #include "config.h" |
---|
26 | #endif |
---|
27 | |
---|
28 | #include <rtems.h> |
---|
29 | #include <rtems/libio_.h> |
---|
30 | #include <errno.h> |
---|
31 | #include <stdio.h> |
---|
32 | #include <fcntl.h> |
---|
33 | #include <termios.h> |
---|
34 | |
---|
35 | #include <rtems/termiostypes.h> |
---|
36 | #include <rtems/bspIo.h> |
---|
37 | #include <rtems/termios_printk.h> |
---|
38 | |
---|
39 | /* |
---|
40 | * internal variables |
---|
41 | */ |
---|
42 | int termios_printk_fd = -1; |
---|
43 | struct rtems_termios_tty *termios_printk_tty; |
---|
44 | |
---|
45 | static void _termios_printk_null_char( |
---|
46 | char c RTEMS_UNUSED) |
---|
47 | { |
---|
48 | return; |
---|
49 | } |
---|
50 | |
---|
51 | BSP_output_char_function_type BSP_output_char = _termios_printk_null_char; |
---|
52 | BSP_polling_getchar_function_type BSP_poll_char; |
---|
53 | |
---|
54 | /*=========================================================================*\ |
---|
55 | | Function: | |
---|
56 | \*-------------------------------------------------------------------------*/ |
---|
57 | void termios_printk_outputchar |
---|
58 | /*-------------------------------------------------------------------------*\ |
---|
59 | | Purpose: | |
---|
60 | | send one character to serial port | |
---|
61 | +---------------------------------------------------------------------------+ |
---|
62 | | Input Parameters: | |
---|
63 | \*-------------------------------------------------------------------------*/ |
---|
64 | ( |
---|
65 | char c /* character to print */ |
---|
66 | ) |
---|
67 | /*-------------------------------------------------------------------------*\ |
---|
68 | | Return Value: | |
---|
69 | | <none> | |
---|
70 | \*=========================================================================*/ |
---|
71 | { |
---|
72 | /* |
---|
73 | * check, whether printk serial port is available |
---|
74 | */ |
---|
75 | |
---|
76 | if ((termios_printk_tty != NULL) && |
---|
77 | (termios_printk_tty->device.write != NULL)) { |
---|
78 | /* |
---|
79 | * call termios_printk polling callout, if available |
---|
80 | */ |
---|
81 | if (termios_printk_conf.callout != NULL) { |
---|
82 | termios_printk_conf.callout(); |
---|
83 | } |
---|
84 | /* |
---|
85 | * send character to debug serial port |
---|
86 | */ |
---|
87 | termios_printk_tty->device.write(termios_printk_tty->minor,&c,1); |
---|
88 | } |
---|
89 | } |
---|
90 | |
---|
91 | /*=========================================================================*\ |
---|
92 | | Function: | |
---|
93 | \*-------------------------------------------------------------------------*/ |
---|
94 | int termios_printk_inputchar |
---|
95 | /*-------------------------------------------------------------------------*\ |
---|
96 | | Purpose: | |
---|
97 | | wait for one character from serial port | |
---|
98 | +---------------------------------------------------------------------------+ |
---|
99 | | Input Parameters: | |
---|
100 | \*-------------------------------------------------------------------------*/ |
---|
101 | ( |
---|
102 | void /* none */ |
---|
103 | ) |
---|
104 | /*-------------------------------------------------------------------------*\ |
---|
105 | | Return Value: | |
---|
106 | | received character | |
---|
107 | \*=========================================================================*/ |
---|
108 | { |
---|
109 | int c = -1; |
---|
110 | /* |
---|
111 | * check, whether debug serial port is available |
---|
112 | */ |
---|
113 | if ((termios_printk_tty != NULL) && |
---|
114 | (termios_printk_tty->device.pollRead != NULL)) { |
---|
115 | do { |
---|
116 | /* |
---|
117 | * call termios_printk polling callout, if available |
---|
118 | */ |
---|
119 | if (termios_printk_conf.callout != NULL) { |
---|
120 | termios_printk_conf.callout(); |
---|
121 | } |
---|
122 | /* |
---|
123 | * get character from debug serial port |
---|
124 | */ |
---|
125 | c = termios_printk_tty->device.pollRead(termios_printk_tty->minor); |
---|
126 | } while (c < 0); |
---|
127 | } |
---|
128 | return c; |
---|
129 | } |
---|
130 | |
---|
131 | |
---|
132 | /*=========================================================================*\ |
---|
133 | | Function: | |
---|
134 | \*-------------------------------------------------------------------------*/ |
---|
135 | int termios_printk_open |
---|
136 | |
---|
137 | /*-------------------------------------------------------------------------*\ |
---|
138 | | Purpose: | |
---|
139 | | try to open given serial debug port | |
---|
140 | +---------------------------------------------------------------------------+ |
---|
141 | | Input Parameters: | |
---|
142 | \*-------------------------------------------------------------------------*/ |
---|
143 | ( |
---|
144 | const char *dev_name, /* name of device to open */ |
---|
145 | uint32_t baudrate /* baud rate to use */ |
---|
146 | ) |
---|
147 | /*-------------------------------------------------------------------------*\ |
---|
148 | | Return Value: | |
---|
149 | | 0 on success, -1 and errno otherwise | |
---|
150 | \*=========================================================================*/ |
---|
151 | { |
---|
152 | bool err_occurred = false; |
---|
153 | rtems_libio_t *iop = NULL; |
---|
154 | struct termios act_termios; |
---|
155 | tcflag_t baudcode = B0; |
---|
156 | |
---|
157 | if (termios_printk_fd >= 0) { |
---|
158 | /* |
---|
159 | * already initialized |
---|
160 | */ |
---|
161 | return 0; |
---|
162 | } |
---|
163 | /* |
---|
164 | * translate baudrate into baud code |
---|
165 | */ |
---|
166 | switch(baudrate) { |
---|
167 | case 50: baudcode = B50; break; |
---|
168 | case 75: baudcode = B75; break; |
---|
169 | case 110: baudcode = B110; break; |
---|
170 | case 134: baudcode = B134; break; |
---|
171 | case 150: baudcode = B150; break; |
---|
172 | case 200: baudcode = B200; break; |
---|
173 | case 300: baudcode = B300; break; |
---|
174 | case 600: baudcode = B600; break; |
---|
175 | case 1200: baudcode = B1200; break; |
---|
176 | case 1800: baudcode = B1800; break; |
---|
177 | case 2400: baudcode = B2400; break; |
---|
178 | case 4800: baudcode = B4800; break; |
---|
179 | case 9600: baudcode = B9600; break; |
---|
180 | case 19200: baudcode = B19200; break; |
---|
181 | case 38400: baudcode = B38400; break; |
---|
182 | case 57600: baudcode = B57600; break; |
---|
183 | case 115200: baudcode = B115200; break; |
---|
184 | case 230400: baudcode = B230400; break; |
---|
185 | case 460800: baudcode = B460800; break; |
---|
186 | default : err_occurred = true; errno = EINVAL; break; |
---|
187 | } |
---|
188 | /* |
---|
189 | * open device for serdbg operation |
---|
190 | */ |
---|
191 | if (!err_occurred && |
---|
192 | (dev_name != NULL) && |
---|
193 | (dev_name[0] != '\0')) { |
---|
194 | termios_printk_fd = open(dev_name,O_RDWR); |
---|
195 | if (termios_printk_fd < 0) { |
---|
196 | err_occurred = true; |
---|
197 | } |
---|
198 | } |
---|
199 | /* |
---|
200 | * capture tty structure |
---|
201 | */ |
---|
202 | if (!err_occurred) { |
---|
203 | iop = &rtems_libio_iops[termios_printk_fd]; |
---|
204 | termios_printk_tty = iop->data1; |
---|
205 | } |
---|
206 | /* |
---|
207 | * set device baudrate |
---|
208 | * (and transp mode, this is not really needed) |
---|
209 | * ... |
---|
210 | */ |
---|
211 | /* |
---|
212 | * ... get fd settings |
---|
213 | */ |
---|
214 | if (!err_occurred && |
---|
215 | (0 != tcgetattr(termios_printk_fd,&act_termios))) { |
---|
216 | err_occurred = true; |
---|
217 | } |
---|
218 | if (!err_occurred) { |
---|
219 | |
---|
220 | cfsetospeed(&act_termios,baudcode); |
---|
221 | cfsetispeed(&act_termios,baudcode); |
---|
222 | |
---|
223 | if (0 != tcsetattr(termios_printk_fd,TCSANOW,&act_termios)) { |
---|
224 | err_occurred = true; |
---|
225 | } |
---|
226 | } |
---|
227 | if (!err_occurred) { |
---|
228 | BSP_output_char = termios_printk_outputchar; |
---|
229 | BSP_poll_char = termios_printk_inputchar; |
---|
230 | } |
---|
231 | return (err_occurred |
---|
232 | ? -1 |
---|
233 | : 0); |
---|
234 | } |
---|