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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  * SPDX-License-Identifier:     GPL-2.0+
9  *
10  * Comments:
11  *
12  * After relocating the code, the environment variable "loglevel" is
13  * copied to console_loglevel.  The functionality is similar to the
14  * handling in the Linux kernel, i.e. messages logged with a priority
15  * less than console_loglevel are also output to stdout.
16  *
17  * If you want messages with the default level (e.g. POST messages) to
18  * appear on stdout also, make sure the environment variable
19  * "loglevel" is set at boot time to a number higher than
20  * default_message_loglevel below.
21  */
22
23 /*
24  * Logbuffer handling routines
25  */
26
27 #include <common.h>
28 #include <command.h>
29 #include <stdio_dev.h>
30 #include <post.h>
31 #include <logbuff.h>
32
33 DECLARE_GLOBAL_DATA_PTR;
34
35 /* Local prototypes */
36 static void logbuff_putc(const char c);
37 static void logbuff_puts(const char *s);
38 static int logbuff_printk(const char *line);
39
40 static char buf[1024];
41
42 /* This combination will not print messages with the default loglevel */
43 static unsigned console_loglevel = 3;
44 static unsigned default_message_loglevel = 4;
45 static unsigned log_version = 1;
46 #ifdef CONFIG_ALT_LB_ADDR
47 static volatile logbuff_t *log;
48 #else
49 static logbuff_t *log;
50 #endif
51 static char *lbuf;
52
53 unsigned long __logbuffer_base(void)
54 {
55         return CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - LOGBUFF_LEN;
56 }
57 unsigned long logbuffer_base(void)
58 __attribute__((weak, alias("__logbuffer_base")));
59
60 void logbuff_init_ptrs(void)
61 {
62         unsigned long tag, post_word;
63         char *s;
64
65 #ifdef CONFIG_ALT_LB_ADDR
66         log = (logbuff_t *)CONFIG_ALT_LH_ADDR;
67         lbuf = (char *)CONFIG_ALT_LB_ADDR;
68 #else
69         log = (logbuff_t *)(logbuffer_base()) - 1;
70         lbuf = (char *)log->buf;
71 #endif
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 #else
87         /* No post routines, so we do our own checking                    */
88         if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
89                 logbuff_reset ();
90                 post_word_store (LOGBUFF_MAGIC);
91         }
92 #endif
93         if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
94                 log->v2.start = log->v2.con;
95
96         /* Initialize default loglevel if present */
97         if ((s = getenv ("loglevel")) != NULL)
98                 console_loglevel = (int)simple_strtoul(s, NULL, 10);
99
100         gd->flags |= GD_FLG_LOGINIT;
101 }
102
103 void logbuff_reset(void)
104 {
105 #ifndef CONFIG_ALT_LB_ADDR
106         memset(log, 0, sizeof(logbuff_t));
107 #endif
108         if (log_version == 2) {
109                 log->v2.tag = LOGBUFF_MAGIC;
110 #ifdef CONFIG_ALT_LB_ADDR
111                 log->v2.start = 0;
112                 log->v2.con = 0;
113                 log->v2.end = 0;
114                 log->v2.chars = 0;
115 #endif
116         } else {
117                 log->v1.tag = LOGBUFF_MAGIC;
118 #ifdef CONFIG_ALT_LB_ADDR
119                 log->v1.dummy = 0;
120                 log->v1.start = 0;
121                 log->v1.size = 0;
122                 log->v1.chars = 0;
123 #endif
124         }
125 }
126
127 int drv_logbuff_init(void)
128 {
129         struct stdio_dev logdev;
130         int rc;
131
132         /* Device initialization */
133         memset (&logdev, 0, sizeof (logdev));
134
135         strcpy (logdev.name, "logbuff");
136         logdev.ext   = 0;                       /* No extensions */
137         logdev.flags = DEV_FLAGS_OUTPUT;        /* Output only */
138         logdev.putc  = logbuff_putc;            /* 'putc' function */
139         logdev.puts  = logbuff_puts;            /* 'puts' function */
140
141         rc = stdio_register(&logdev);
142
143         return (rc == 0) ? 1 : rc;
144 }
145
146 static void logbuff_putc(const char c)
147 {
148         char buf[2];
149         buf[0] = c;
150         buf[1] = '\0';
151         logbuff_printk(buf);
152 }
153
154 static void logbuff_puts(const char *s)
155 {
156         logbuff_printk (s);
157 }
158
159 void logbuff_log(char *msg)
160 {
161         if ((gd->flags & GD_FLG_LOGINIT)) {
162                 logbuff_printk(msg);
163         } else {
164                 /*
165                  * Can happen only for pre-relocated errors as logging
166                  * at that stage should be disabled
167                  */
168                 puts (msg);
169         }
170 }
171
172 /*
173  * Subroutine:  do_log
174  *
175  * Description: Handler for 'log' command..
176  *
177  * Inputs:      argv[1] contains the subcommand
178  *
179  * Return:      None
180  *
181  */
182 int do_log(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
183 {
184         char *s;
185         unsigned long i, start, size;
186
187         if (strcmp(argv[1], "append") == 0) {
188                 /* Log concatenation of all arguments separated by spaces */
189                 for (i = 2; i < argc; i++) {
190                         logbuff_printk(argv[i]);
191                         logbuff_putc((i < argc - 1) ? ' ' : '\n');
192                 }
193                 return 0;
194         }
195
196         switch (argc) {
197
198         case 2:
199                 if (strcmp(argv[1], "show") == 0) {
200                         if (log_version == 2) {
201                                 start = log->v2.start;
202                                 size = log->v2.end - log->v2.start;
203                         } else {
204                                 start = log->v1.start;
205                                 size = log->v1.size;
206                         }
207                         if (size > LOGBUFF_LEN)
208                                 size = LOGBUFF_LEN;
209                         for (i = 0; i < size; i++) {
210                                 s = lbuf + ((start + i) & LOGBUFF_MASK);
211                                 putc(*s);
212                         }
213                         return 0;
214                 } else if (strcmp(argv[1], "reset") == 0) {
215                         logbuff_reset();
216                         return 0;
217                 } else if (strcmp(argv[1], "info") == 0) {
218                         printf("Logbuffer   at  %08lx\n", (unsigned long)lbuf);
219                         if (log_version == 2) {
220                                 printf("log_start    =  %08lx\n",
221                                         log->v2.start);
222                                 printf("log_end      =  %08lx\n", log->v2.end);
223                                 printf("log_con      =  %08lx\n", log->v2.con);
224                                 printf("logged_chars =  %08lx\n",
225                                         log->v2.chars);
226                         }
227                         else {
228                                 printf("log_start    =  %08lx\n",
229                                         log->v1.start);
230                                 printf("log_size     =  %08lx\n",
231                                         log->v1.size);
232                                 printf("logged_chars =  %08lx\n",
233                                         log->v1.chars);
234                         }
235                         return 0;
236                 }
237                 return CMD_RET_USAGE;
238
239         default:
240                 return CMD_RET_USAGE;
241         }
242 }
243
244 U_BOOT_CMD(
245         log,     255,   1,      do_log,
246         "manipulate logbuffer",
247         "info   - show pointer details\n"
248         "log reset  - clear contents\n"
249         "log show   - show contents\n"
250         "log append <msg> - append <msg> to the logbuffer"
251 );
252
253 static int logbuff_printk(const char *line)
254 {
255         int i;
256         char *msg, *p, *buf_end;
257         int line_feed;
258         static signed char msg_level = -1;
259
260         strcpy(buf + 3, line);
261         i = strlen(line);
262         buf_end = buf + 3 + i;
263         for (p = buf + 3; p < buf_end; p++) {
264                 msg = p;
265                 if (msg_level < 0) {
266                         if (
267                                 p[0] != '<' ||
268                                 p[1] < '0' ||
269                                 p[1] > '7' ||
270                                 p[2] != '>'
271                         ) {
272                                 p -= 3;
273                                 p[0] = '<';
274                                 p[1] = default_message_loglevel + '0';
275                                 p[2] = '>';
276                         } else {
277                                 msg += 3;
278                         }
279                         msg_level = p[1] - '0';
280                 }
281                 line_feed = 0;
282                 for (; p < buf_end; p++) {
283                         if (log_version == 2) {
284                                 lbuf[log->v2.end & LOGBUFF_MASK] = *p;
285                                 log->v2.end++;
286                                 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
287                                         log->v2.start++;
288                                 log->v2.chars++;
289                         } else {
290                                 lbuf[(log->v1.start + log->v1.size) &
291                                          LOGBUFF_MASK] = *p;
292                                 if (log->v1.size < LOGBUFF_LEN)
293                                         log->v1.size++;
294                                 else
295                                         log->v1.start++;
296                                 log->v1.chars++;
297                         }
298                         if (*p == '\n') {
299                                 line_feed = 1;
300                                 break;
301                         }
302                 }
303                 if (msg_level < console_loglevel) {
304                         printf("%s", msg);
305                 }
306                 if (line_feed)
307                         msg_level = -1;
308         }
309         return i;
310 }