avr32: use dlmalloc for DMA buffers
[oweals/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  * 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(struct stdio_dev *dev, const char c);
37 static void logbuff_puts(struct stdio_dev *dev, 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(struct stdio_dev *dev, 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(struct stdio_dev *dev, 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         struct stdio_dev *sdev = NULL;
185         char *s;
186         unsigned long i, start, size;
187
188         if (strcmp(argv[1], "append") == 0) {
189                 /* Log concatenation of all arguments separated by spaces */
190                 for (i = 2; i < argc; i++) {
191                         logbuff_printk(argv[i]);
192                         logbuff_putc(sdev, (i < argc - 1) ? ' ' : '\n');
193                 }
194                 return 0;
195         }
196
197         switch (argc) {
198
199         case 2:
200                 if (strcmp(argv[1], "show") == 0) {
201                         if (log_version == 2) {
202                                 start = log->v2.start;
203                                 size = log->v2.end - log->v2.start;
204                         } else {
205                                 start = log->v1.start;
206                                 size = log->v1.size;
207                         }
208                         if (size > LOGBUFF_LEN)
209                                 size = LOGBUFF_LEN;
210                         for (i = 0; i < size; i++) {
211                                 s = lbuf + ((start + i) & LOGBUFF_MASK);
212                                 putc(*s);
213                         }
214                         return 0;
215                 } else if (strcmp(argv[1], "reset") == 0) {
216                         logbuff_reset();
217                         return 0;
218                 } else if (strcmp(argv[1], "info") == 0) {
219                         printf("Logbuffer   at  %08lx\n", (unsigned long)lbuf);
220                         if (log_version == 2) {
221                                 printf("log_start    =  %08lx\n",
222                                         log->v2.start);
223                                 printf("log_end      =  %08lx\n", log->v2.end);
224                                 printf("log_con      =  %08lx\n", log->v2.con);
225                                 printf("logged_chars =  %08lx\n",
226                                         log->v2.chars);
227                         }
228                         else {
229                                 printf("log_start    =  %08lx\n",
230                                         log->v1.start);
231                                 printf("log_size     =  %08lx\n",
232                                         log->v1.size);
233                                 printf("logged_chars =  %08lx\n",
234                                         log->v1.chars);
235                         }
236                         return 0;
237                 }
238                 return CMD_RET_USAGE;
239
240         default:
241                 return CMD_RET_USAGE;
242         }
243 }
244
245 U_BOOT_CMD(
246         log,     255,   1,      do_log,
247         "manipulate logbuffer",
248         "info   - show pointer details\n"
249         "log reset  - clear contents\n"
250         "log show   - show contents\n"
251         "log append <msg> - append <msg> to the logbuffer"
252 );
253
254 static int logbuff_printk(const char *line)
255 {
256         int i;
257         char *msg, *p, *buf_end;
258         int line_feed;
259         static signed char msg_level = -1;
260
261         strcpy(buf + 3, line);
262         i = strlen(line);
263         buf_end = buf + 3 + i;
264         for (p = buf + 3; p < buf_end; p++) {
265                 msg = p;
266                 if (msg_level < 0) {
267                         if (
268                                 p[0] != '<' ||
269                                 p[1] < '0' ||
270                                 p[1] > '7' ||
271                                 p[2] != '>'
272                         ) {
273                                 p -= 3;
274                                 p[0] = '<';
275                                 p[1] = default_message_loglevel + '0';
276                                 p[2] = '>';
277                         } else {
278                                 msg += 3;
279                         }
280                         msg_level = p[1] - '0';
281                 }
282                 line_feed = 0;
283                 for (; p < buf_end; p++) {
284                         if (log_version == 2) {
285                                 lbuf[log->v2.end & LOGBUFF_MASK] = *p;
286                                 log->v2.end++;
287                                 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
288                                         log->v2.start++;
289                                 log->v2.chars++;
290                         } else {
291                                 lbuf[(log->v1.start + log->v1.size) &
292                                          LOGBUFF_MASK] = *p;
293                                 if (log->v1.size < LOGBUFF_LEN)
294                                         log->v1.size++;
295                                 else
296                                         log->v1.start++;
297                                 log->v1.chars++;
298                         }
299                         if (*p == '\n') {
300                                 line_feed = 1;
301                                 break;
302                         }
303                 }
304                 if (msg_level < console_loglevel) {
305                         printf("%s", msg);
306                 }
307                 if (line_feed)
308                         msg_level = -1;
309         }
310         return i;
311 }