1 /*
2 * (C) Copyright 2002-2007
3 * Detlev Zundel, DENX Software Engineering, dzu@denx.de.
4 *
5 * Code used from linux/kernel/printk.c
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 *
8 * See file CREDITS for list of people who contributed to this
9 * project.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24 * MA 02111-1307 USA
25 *
26 * Comments:
27 *
28 * After relocating the code, the environment variable "loglevel" is
29 * copied to console_loglevel. The functionality is similar to the
30 * handling in the Linux kernel, i.e. messages logged with a priority
31 * less than console_loglevel are also output to stdout.
32 *
33 * If you want messages with the default level (e.g. POST messages) to
34 * appear on stdout also, make sure the environment variable
35 * "loglevel" is set at boot time to a number higher than
36 * default_message_loglevel below.
37 */
38
39 /*
40 * Logbuffer handling routines
41 */
42
43 #include <common.h>
44 #include <command.h>
45 #include <stdio_dev.h>
46 #include <post.h>
47 #include <logbuff.h>
48
49 DECLARE_GLOBAL_DATA_PTR;
50
51 /* Local prototypes */
52 static void logbuff_putc (const char c);
53 static void logbuff_puts (const char *s);
54 static int logbuff_printk(const char *line);
55
56 static char buf[1024];
57
58 /* This combination will not print messages with the default loglevel */
59 static unsigned console_loglevel = 3;
60 static unsigned default_message_loglevel = 4;
61 static unsigned log_version = 1;
62 #ifdef CONFIG_ALT_LB_ADDR
63 static volatile logbuff_t *log;
64 #else
65 static logbuff_t *log;
66 #endif
67 static char *lbuf;
68
__logbuffer_base(void)69 unsigned long __logbuffer_base(void)
70 {
71 return CONFIG_SYS_SDRAM_BASE + gd->bd->bi_memsize - LOGBUFF_LEN;
72 }
73 unsigned long logbuffer_base (void) __attribute__((weak, alias("__logbuffer_base")));
74
logbuff_init_ptrs(void)75 void logbuff_init_ptrs (void)
76 {
77 unsigned long tag, post_word;
78 char *s;
79
80 #ifdef CONFIG_ALT_LB_ADDR
81 log = (logbuff_t *)CONFIG_ALT_LH_ADDR;
82 lbuf = (char *)CONFIG_ALT_LB_ADDR;
83 #else
84 log = (logbuff_t *)(logbuffer_base ()) - 1;
85 lbuf = (char *)log->buf;
86 #endif
87
88 /* Set up log version */
89 if ((s = getenv ("logversion")) != NULL)
90 log_version = (int)simple_strtoul (s, NULL, 10);
91
92 if (log_version == 2)
93 tag = log->v2.tag;
94 else
95 tag = log->v1.tag;
96 post_word = post_word_load();
97 #ifdef CONFIG_POST
98 /* The post routines have setup the word so we can simply test it */
99 if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT)) {
100 logbuff_reset ();
101 }
102 #else
103 /* No post routines, so we do our own checking */
104 if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
105 logbuff_reset ();
106 post_word_store (LOGBUFF_MAGIC);
107 }
108 #endif
109 if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
110 log->v2.start = log->v2.con;
111
112 /* Initialize default loglevel if present */
113 if ((s = getenv ("loglevel")) != NULL)
114 console_loglevel = (int)simple_strtoul (s, NULL, 10);
115
116 gd->flags |= GD_FLG_LOGINIT;
117 }
118
logbuff_reset(void)119 void logbuff_reset (void)
120 {
121 #ifndef CONFIG_ALT_LB_ADDR
122 memset (log, 0, sizeof (logbuff_t));
123 #endif
124 if (log_version == 2) {
125 log->v2.tag = LOGBUFF_MAGIC;
126 #ifdef CONFIG_ALT_LB_ADDR
127 log->v2.start = 0;
128 log->v2.con = 0;
129 log->v2.end = 0;
130 log->v2.chars = 0;
131 #endif
132 } else {
133 log->v1.tag = LOGBUFF_MAGIC;
134 #ifdef CONFIG_ALT_LB_ADDR
135 log->v1.dummy = 0;
136 log->v1.start = 0;
137 log->v1.size = 0;
138 log->v1.chars = 0;
139 #endif
140 }
141 }
142
drv_logbuff_init(void)143 int drv_logbuff_init (void)
144 {
145 struct stdio_dev logdev;
146 int rc;
147
148 /* Device initialization */
149 memset (&logdev, 0, sizeof (logdev));
150
151 strcpy (logdev.name, "logbuff");
152 logdev.ext = 0; /* No extensions */
153 logdev.flags = DEV_FLAGS_OUTPUT; /* Output only */
154 logdev.putc = logbuff_putc; /* 'putc' function */
155 logdev.puts = logbuff_puts; /* 'puts' function */
156
157 rc = stdio_register (&logdev);
158
159 return (rc == 0) ? 1 : rc;
160 }
161
logbuff_putc(const char c)162 static void logbuff_putc (const char c)
163 {
164 char buf[2];
165 buf[0] = c;
166 buf[1] = '\0';
167 logbuff_printk (buf);
168 }
169
logbuff_puts(const char * s)170 static void logbuff_puts (const char *s)
171 {
172 logbuff_printk (s);
173 }
174
logbuff_log(char * msg)175 void logbuff_log(char *msg)
176 {
177 if ((gd->flags & GD_FLG_LOGINIT)) {
178 logbuff_printk (msg);
179 } else {
180 /* Can happen only for pre-relocated errors as logging */
181 /* at that stage should be disabled */
182 puts (msg);
183 }
184 }
185
186 /*
187 * Subroutine: do_log
188 *
189 * Description: Handler for 'log' command..
190 *
191 * Inputs: argv[1] contains the subcommand
192 *
193 * Return: None
194 *
195 */
do_log(cmd_tbl_t * cmdtp,int flag,int argc,char * argv[])196 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
197 {
198 char *s;
199 unsigned long i, start, size;
200
201 if (strcmp(argv[1],"append") == 0) {
202 /* Log concatenation of all arguments separated by spaces */
203 for (i=2; i<argc; i++) {
204 logbuff_printk (argv[i]);
205 logbuff_putc ((i<argc-1) ? ' ' : '\n');
206 }
207 return 0;
208 }
209
210 switch (argc) {
211
212 case 2:
213 if (strcmp(argv[1],"show") == 0) {
214 if (log_version == 2) {
215 start = log->v2.start;
216 size = log->v2.end - log->v2.start;
217 }
218 else {
219 start = log->v1.start;
220 size = log->v1.size;
221 }
222 for (i=0; i < (size&LOGBUFF_MASK); i++) {
223 s = lbuf+((start+i)&LOGBUFF_MASK);
224 putc (*s);
225 }
226 return 0;
227 } else if (strcmp(argv[1],"reset") == 0) {
228 logbuff_reset ();
229 return 0;
230 } else if (strcmp(argv[1],"info") == 0) {
231 printf ("Logbuffer at %08lx\n", (unsigned long)lbuf);
232 if (log_version == 2) {
233 printf ("log_start = %08lx\n", log->v2.start);
234 printf ("log_end = %08lx\n", log->v2.end);
235 printf ("logged_chars = %08lx\n", log->v2.chars);
236 }
237 else {
238 printf ("log_start = %08lx\n", log->v1.start);
239 printf ("log_size = %08lx\n", log->v1.size);
240 printf ("logged_chars = %08lx\n", log->v1.chars);
241 }
242 return 0;
243 }
244 cmd_usage(cmdtp);
245 return 1;
246
247 default:
248 cmd_usage(cmdtp);
249 return 1;
250 }
251 }
252
253 U_BOOT_CMD(
254 log, 255, 1, do_log,
255 "manipulate logbuffer",
256 "info - show pointer details\n"
257 "log reset - clear contents\n"
258 "log show - show contents\n"
259 "log append <msg> - append <msg> to the logbuffer"
260 );
261
logbuff_printk(const char * line)262 static int logbuff_printk(const char *line)
263 {
264 int i;
265 char *msg, *p, *buf_end;
266 int line_feed;
267 static signed char msg_level = -1;
268
269 strcpy (buf + 3, line);
270 i = strlen (line);
271 buf_end = buf + 3 + i;
272 for (p = buf + 3; p < buf_end; p++) {
273 msg = p;
274 if (msg_level < 0) {
275 if (
276 p[0] != '<' ||
277 p[1] < '0' ||
278 p[1] > '7' ||
279 p[2] != '>'
280 ) {
281 p -= 3;
282 p[0] = '<';
283 p[1] = default_message_loglevel + '0';
284 p[2] = '>';
285 } else
286 msg += 3;
287 msg_level = p[1] - '0';
288 }
289 line_feed = 0;
290 for (; p < buf_end; p++) {
291 if (log_version == 2) {
292 lbuf[log->v2.end & LOGBUFF_MASK] = *p;
293 log->v2.end++;
294 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
295 log->v2.start++;
296 log->v2.chars++;
297 }
298 else {
299 lbuf[(log->v1.start + log->v1.size) &
300 LOGBUFF_MASK] = *p;
301 if (log->v1.size < LOGBUFF_LEN)
302 log->v1.size++;
303 else
304 log->v1.start++;
305 log->v1.chars++;
306 }
307 if (*p == '\n') {
308 line_feed = 1;
309 break;
310 }
311 }
312 if (msg_level < console_loglevel) {
313 printf("%s", msg);
314 }
315 if (line_feed)
316 msg_level = -1;
317 }
318 return i;
319 }
320