Enable ULi1575 Ethernet support in 8610HPCD config
[platform/kernel/u-boot.git] / common / cmd_log.c
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 <devices.h>
46 #include <post.h>
47 #include <logbuff.h>
48
49 DECLARE_GLOBAL_DATA_PTR;
50
51 #if defined(CONFIG_LOGBUFFER)
52
53 /* Local prototypes */
54 static void logbuff_putc (const char c);
55 static void logbuff_puts (const char *s);
56 static int logbuff_printk(const char *line);
57
58 static char buf[1024];
59
60 /* This combination will not print messages with the default loglevel */
61 static unsigned console_loglevel = 3;
62 static unsigned default_message_loglevel = 4;
63 static unsigned log_version = 1;
64 static logbuff_t *log;
65
66 void logbuff_init_ptrs (void)
67 {
68         unsigned long tag, post_word;
69         char *s;
70
71         log = (logbuff_t *)(gd->bd->bi_memsize-LOGBUFF_LEN) - 1;
72
73         /* Set up log version */
74         if ((s = getenv ("logversion")) != NULL)
75                 log_version = (int)simple_strtoul (s, NULL, 10);
76
77         if (log_version == 2)
78                 tag = log->v2.tag;
79         else
80                 tag = log->v1.tag;
81         post_word = post_word_load();
82 #ifdef CONFIG_POST
83         /* The post routines have setup the word so we can simply test it */
84         if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT)) {
85                 logbuff_reset ();
86         }
87 #else
88         /* No post routines, so we do our own checking                    */
89         if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
90                 logbuff_reset ();
91                 post_word_store (LOGBUFF_MAGIC);
92         }
93 #endif
94         if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
95                 log->v2.start = log->v2.con;
96
97         /* Initialize default loglevel if present */
98         if ((s = getenv ("loglevel")) != NULL)
99                 console_loglevel = (int)simple_strtoul (s, NULL, 10);
100
101         gd->post_log_word |= LOGBUFF_INITIALIZED;
102 }
103
104 void logbuff_reset (void)
105 {
106         memset (log, 0, sizeof (logbuff_t));
107         if (log_version == 2)
108                 log->v2.tag = LOGBUFF_MAGIC;
109         else
110                 log->v1.tag = LOGBUFF_MAGIC;
111 }
112
113 int drv_logbuff_init (void)
114 {
115         device_t logdev;
116         int rc;
117
118         /* Device initialization */
119         memset (&logdev, 0, sizeof (logdev));
120
121         strcpy (logdev.name, "logbuff");
122         logdev.ext   = 0;                       /* No extensions */
123         logdev.flags = DEV_FLAGS_OUTPUT;        /* Output only */
124         logdev.putc  = logbuff_putc;            /* 'putc' function */
125         logdev.puts  = logbuff_puts;            /* 'puts' function */
126
127         rc = device_register (&logdev);
128
129         return (rc == 0) ? 1 : rc;
130 }
131
132 static void logbuff_putc (const char c)
133 {
134         char buf[2];
135         buf[0] = c;
136         buf[1] = '\0';
137         logbuff_printk (buf);
138 }
139
140 static void logbuff_puts (const char *s)
141 {
142         logbuff_printk (s);
143 }
144
145 void logbuff_log(char *msg)
146 {
147         if ((gd->post_log_word & LOGBUFF_INITIALIZED)) {
148                 logbuff_printk (msg);
149         } else {
150                 /* Can happen only for pre-relocated errors as logging */
151                 /* at that stage should be disabled                    */
152                 puts (msg);
153         }
154 }
155
156 /*
157  * Subroutine:  do_log
158  *
159  * Description: Handler for 'log' command..
160  *
161  * Inputs:      argv[1] contains the subcommand
162  *
163  * Return:      None
164  *
165  */
166 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
167 {
168         char *s;
169         unsigned long i, start, size;
170
171         if (strcmp(argv[1],"append") == 0) {
172                 /* Log concatenation of all arguments separated by spaces */
173                 for (i=2; i<argc; i++) {
174                         logbuff_printk (argv[i]);
175                         logbuff_putc ((i<argc-1) ? ' ' : '\n');
176                 }
177                 return 0;
178         }
179
180         switch (argc) {
181
182         case 2:
183                 if (strcmp(argv[1],"show") == 0) {
184                         if (log_version == 2) {
185                                 start = log->v2.start;
186                                 size = log->v2.end - log->v2.start;
187                         }
188                         else {
189                                 start = log->v1.start;
190                                 size = log->v1.size;
191                         }
192                         for (i=0; i < (size&LOGBUFF_MASK); i++) {
193                                 s = (char *)log->buf+((start+i)&LOGBUFF_MASK);
194                                 putc (*s);
195                         }
196                         return 0;
197                 } else if (strcmp(argv[1],"reset") == 0) {
198                         logbuff_reset ();
199                         return 0;
200                 } else if (strcmp(argv[1],"info") == 0) {
201                         printf ("Logbuffer   at  %08lx\n", (unsigned long)log->buf);
202                         if (log_version == 2) {
203                                 printf ("log_start    =  %08lx\n", log->v2.start);
204                                 printf ("log_end      =  %08lx\n", log->v2.end);
205                                 printf ("logged_chars =  %08lx\n", log->v2.chars);
206                         }
207                         else {
208                                 printf ("log_start    =  %08lx\n", log->v1.start);
209                                 printf ("log_size     =  %08lx\n", log->v1.size);
210                                 printf ("logged_chars =  %08lx\n", log->v1.chars);
211                         }
212                         return 0;
213                 }
214                 printf ("Usage:\n%s\n", cmdtp->usage);
215                 return 1;
216
217         default:
218                 printf ("Usage:\n%s\n", cmdtp->usage);
219                 return 1;
220         }
221 }
222
223 U_BOOT_CMD(
224         log,     255,   1,      do_log,
225         "log     - manipulate logbuffer\n",
226         "info   - show pointer details\n"
227         "log reset  - clear contents\n"
228         "log show   - show contents\n"
229         "log append <msg> - append <msg> to the logbuffer\n"
230 );
231
232 static int logbuff_printk(const char *line)
233 {
234         int i;
235         char *msg, *p, *buf_end;
236         int line_feed;
237         static signed char msg_level = -1;
238
239         strcpy (buf + 3, line);
240         i = strlen (line);
241         buf_end = buf + 3 + i;
242         for (p = buf + 3; p < buf_end; p++) {
243                 msg = p;
244                 if (msg_level < 0) {
245                         if (
246                                 p[0] != '<' ||
247                                 p[1] < '0' ||
248                                 p[1] > '7' ||
249                                 p[2] != '>'
250                         ) {
251                                 p -= 3;
252                                 p[0] = '<';
253                                 p[1] = default_message_loglevel + '0';
254                                 p[2] = '>';
255                         } else
256                                 msg += 3;
257                         msg_level = p[1] - '0';
258                 }
259                 line_feed = 0;
260                 for (; p < buf_end; p++) {
261                         if (log_version == 2) {
262                                 log->buf[log->v2.end & LOGBUFF_MASK] = *p;
263                                 log->v2.end++;
264                                 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
265                                         log->v2.start++;
266                                 log->v2.chars++;
267                         }
268                         else {
269                                 log->buf[(log->v1.start + log->v1.size) &
270                                          LOGBUFF_MASK] = *p;
271                                 if (log->v1.size < LOGBUFF_LEN)
272                                         log->v1.size++;
273                                 else
274                                         log->v1.start++;
275                                 log->v1.chars++;
276                         }
277                         if (*p == '\n') {
278                                 line_feed = 1;
279                                 break;
280                         }
281                 }
282                 if (msg_level < console_loglevel) {
283                         printf("%s", msg);
284                 }
285                 if (line_feed)
286                         msg_level = -1;
287         }
288         return i;
289 }
290
291 #endif /* (CONFIG_LOGBUFFER) */