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1 /*
2  * (C) Copyright 2000-2002
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
6  * Andreas Heppel <aheppel@sysgo.de>
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
27 /* #define DEBUG */
28
29 #include <common.h>
30 #include <command.h>
31 #include <environment.h>
32 #include <linux/stddef.h>
33 #include <malloc.h>
34
35 DECLARE_GLOBAL_DATA_PTR;
36
37 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
38 #define CMD_SAVEENV
39 #elif defined(CONFIG_ENV_ADDR_REDUND)
40 #error Cannot use CONFIG_ENV_ADDR_REDUND without CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
41 #endif
42
43 #if defined(CONFIG_ENV_SIZE_REDUND) && (CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE)
44 #error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
45 #endif
46
47 #ifdef CONFIG_INFERNO
48 # ifdef CONFIG_ENV_ADDR_REDUND
49 #error CONFIG_ENV_ADDR_REDUND is not implemented for CONFIG_INFERNO
50 # endif
51 #endif
52
53 char * env_name_spec = "Flash";
54
55 #ifdef ENV_IS_EMBEDDED
56
57 extern uchar environment[];
58 env_t *env_ptr = (env_t *)(&environment[0]);
59
60 #ifdef CMD_SAVEENV
61 /* static env_t *flash_addr = (env_t *)(&environment[0]);-broken on ARM-wd-*/
62 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
63 #endif
64
65 #else /* ! ENV_IS_EMBEDDED */
66
67 env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
68 #ifdef CMD_SAVEENV
69 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
70 #endif
71
72 #endif /* ENV_IS_EMBEDDED */
73
74 #ifdef CONFIG_ENV_ADDR_REDUND
75 static env_t *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
76
77 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
78 static ulong end_addr = CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
79 static ulong end_addr_new = CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
80
81 #define ACTIVE_FLAG   1
82 #define OBSOLETE_FLAG 0
83 #endif /* CONFIG_ENV_ADDR_REDUND */
84
85 extern uchar default_environment[];
86
87
88 uchar env_get_char_spec (int index)
89 {
90         return ( *((uchar *)(gd->env_addr + index)) );
91 }
92
93 #ifdef CONFIG_ENV_ADDR_REDUND
94
95 int  env_init(void)
96 {
97         int crc1_ok = 0, crc2_ok = 0;
98
99         uchar flag1 = flash_addr->flags;
100         uchar flag2 = flash_addr_new->flags;
101
102         ulong addr_default = (ulong)&default_environment[0];
103         ulong addr1 = (ulong)&(flash_addr->data);
104         ulong addr2 = (ulong)&(flash_addr_new->data);
105
106         crc1_ok = (crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc);
107         crc2_ok = (crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc);
108
109         if (crc1_ok && ! crc2_ok) {
110                 gd->env_addr  = addr1;
111                 gd->env_valid = 1;
112         } else if (! crc1_ok && crc2_ok) {
113                 gd->env_addr  = addr2;
114                 gd->env_valid = 1;
115         } else if (! crc1_ok && ! crc2_ok) {
116                 gd->env_addr  = addr_default;
117                 gd->env_valid = 0;
118         } else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
119                 gd->env_addr  = addr1;
120                 gd->env_valid = 1;
121         } else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
122                 gd->env_addr  = addr2;
123                 gd->env_valid = 1;
124         } else if (flag1 == flag2) {
125                 gd->env_addr  = addr1;
126                 gd->env_valid = 2;
127         } else if (flag1 == 0xFF) {
128                 gd->env_addr  = addr1;
129                 gd->env_valid = 2;
130         } else if (flag2 == 0xFF) {
131                 gd->env_addr  = addr2;
132                 gd->env_valid = 2;
133         }
134
135         return (0);
136 }
137
138 #ifdef CMD_SAVEENV
139 int saveenv(void)
140 {
141         char *saved_data = NULL;
142         int rc = 1;
143         char flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
144 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
145         ulong up_data = 0;
146 #endif
147
148         debug ("Protect off %08lX ... %08lX\n",
149                 (ulong)flash_addr, end_addr);
150
151         if (flash_sect_protect (0, (ulong)flash_addr, end_addr)) {
152                 goto Done;
153         }
154
155         debug ("Protect off %08lX ... %08lX\n",
156                 (ulong)flash_addr_new, end_addr_new);
157
158         if (flash_sect_protect (0, (ulong)flash_addr_new, end_addr_new)) {
159                 goto Done;
160         }
161
162 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
163         up_data = (end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE));
164         debug ("Data to save 0x%x\n", up_data);
165         if (up_data) {
166                 if ((saved_data = malloc(up_data)) == NULL) {
167                         printf("Unable to save the rest of sector (%ld)\n",
168                                 up_data);
169                         goto Done;
170                 }
171                 memcpy(saved_data,
172                         (void *)((long)flash_addr_new + CONFIG_ENV_SIZE), up_data);
173                 debug ("Data (start 0x%x, len 0x%x) saved at 0x%x\n",
174                            (long)flash_addr_new + CONFIG_ENV_SIZE,
175                                 up_data, saved_data);
176         }
177 #endif
178         puts ("Erasing Flash...");
179         debug (" %08lX ... %08lX ...",
180                 (ulong)flash_addr_new, end_addr_new);
181
182         if (flash_sect_erase ((ulong)flash_addr_new, end_addr_new)) {
183                 goto Done;
184         }
185
186         puts ("Writing to Flash... ");
187         debug (" %08lX ... %08lX ...",
188                 (ulong)&(flash_addr_new->data),
189                 sizeof(env_ptr->data)+(ulong)&(flash_addr_new->data));
190         if ((rc = flash_write((char *)env_ptr->data,
191                         (ulong)&(flash_addr_new->data),
192                         sizeof(env_ptr->data))) ||
193             (rc = flash_write((char *)&(env_ptr->crc),
194                         (ulong)&(flash_addr_new->crc),
195                         sizeof(env_ptr->crc))) ||
196             (rc = flash_write(&flag,
197                         (ulong)&(flash_addr->flags),
198                         sizeof(flash_addr->flags))) ||
199             (rc = flash_write(&new_flag,
200                         (ulong)&(flash_addr_new->flags),
201                         sizeof(flash_addr_new->flags))))
202         {
203                 flash_perror (rc);
204                 goto Done;
205         }
206         puts ("done\n");
207
208 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
209         if (up_data) { /* restore the rest of sector */
210                 debug ("Restoring the rest of data to 0x%x len 0x%x\n",
211                            (long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
212                 if (flash_write(saved_data,
213                                 (long)flash_addr_new + CONFIG_ENV_SIZE,
214                                 up_data)) {
215                         flash_perror(rc);
216                         goto Done;
217                 }
218         }
219 #endif
220         {
221                 env_t * etmp = flash_addr;
222                 ulong ltmp = end_addr;
223
224                 flash_addr = flash_addr_new;
225                 flash_addr_new = etmp;
226
227                 end_addr = end_addr_new;
228                 end_addr_new = ltmp;
229         }
230
231         rc = 0;
232 Done:
233
234         if (saved_data)
235                 free (saved_data);
236         /* try to re-protect */
237         (void) flash_sect_protect (1, (ulong)flash_addr, end_addr);
238         (void) flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
239
240         return rc;
241 }
242 #endif /* CMD_SAVEENV */
243
244 #else /* ! CONFIG_ENV_ADDR_REDUND */
245
246 int  env_init(void)
247 {
248         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
249                 gd->env_addr  = (ulong)&(env_ptr->data);
250                 gd->env_valid = 1;
251                 return(0);
252         }
253
254         gd->env_addr  = (ulong)&default_environment[0];
255         gd->env_valid = 0;
256         return (0);
257 }
258
259 #ifdef CMD_SAVEENV
260
261 int saveenv(void)
262 {
263         int     len, rc;
264         ulong   end_addr;
265         ulong   flash_sect_addr;
266 #if defined(CONFIG_ENV_SECT_SIZE) && (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE)
267         ulong   flash_offset;
268         uchar   env_buffer[CONFIG_ENV_SECT_SIZE];
269 #else
270         uchar *env_buffer = (uchar *)env_ptr;
271 #endif  /* CONFIG_ENV_SECT_SIZE */
272         int rcode = 0;
273
274 #if defined(CONFIG_ENV_SECT_SIZE) && (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE)
275
276         flash_offset    = ((ulong)flash_addr) & (CONFIG_ENV_SECT_SIZE-1);
277         flash_sect_addr = ((ulong)flash_addr) & ~(CONFIG_ENV_SECT_SIZE-1);
278
279         debug ( "copy old content: "
280                 "sect_addr: %08lX  env_addr: %08lX  offset: %08lX\n",
281                 flash_sect_addr, (ulong)flash_addr, flash_offset);
282
283         /* copy old contents to temporary buffer */
284         memcpy (env_buffer, (void *)flash_sect_addr, CONFIG_ENV_SECT_SIZE);
285
286         /* copy current environment to temporary buffer */
287         memcpy ((uchar *)((unsigned long)env_buffer + flash_offset),
288                 env_ptr,
289                 CONFIG_ENV_SIZE);
290
291         len      = CONFIG_ENV_SECT_SIZE;
292 #else
293         flash_sect_addr = (ulong)flash_addr;
294         len      = CONFIG_ENV_SIZE;
295 #endif  /* CONFIG_ENV_SECT_SIZE */
296
297 #ifndef CONFIG_INFERNO
298         end_addr = flash_sect_addr + len - 1;
299 #else
300         /* this is the last sector, and the size is hardcoded here */
301         /* otherwise we will get stack problems on loading 128 KB environment */
302         end_addr = flash_sect_addr + 0x20000 - 1;
303 #endif
304
305         debug ("Protect off %08lX ... %08lX\n",
306                 (ulong)flash_sect_addr, end_addr);
307
308         if (flash_sect_protect (0, flash_sect_addr, end_addr))
309                 return 1;
310
311         puts ("Erasing Flash...");
312         if (flash_sect_erase (flash_sect_addr, end_addr))
313                 return 1;
314
315         puts ("Writing to Flash... ");
316         rc = flash_write((char *)env_buffer, flash_sect_addr, len);
317         if (rc != 0) {
318                 flash_perror (rc);
319                 rcode = 1;
320         } else {
321                 puts ("done\n");
322         }
323
324         /* try to re-protect */
325         (void) flash_sect_protect (1, flash_sect_addr, end_addr);
326         return rcode;
327 }
328
329 #endif /* CMD_SAVEENV */
330
331 #endif /* CONFIG_ENV_ADDR_REDUND */
332
333 void env_relocate_spec (void)
334 {
335 #if !defined(ENV_IS_EMBEDDED) || defined(CONFIG_ENV_ADDR_REDUND)
336 #ifdef CONFIG_ENV_ADDR_REDUND
337         if (gd->env_addr != (ulong)&(flash_addr->data)) {
338                 env_t * etmp = flash_addr;
339                 ulong ltmp = end_addr;
340
341                 flash_addr = flash_addr_new;
342                 flash_addr_new = etmp;
343
344                 end_addr = end_addr_new;
345                 end_addr_new = ltmp;
346         }
347
348         if (flash_addr_new->flags != OBSOLETE_FLAG &&
349             crc32(0, flash_addr_new->data, ENV_SIZE) ==
350             flash_addr_new->crc) {
351                 char flag = OBSOLETE_FLAG;
352
353                 gd->env_valid = 2;
354                 flash_sect_protect (0, (ulong)flash_addr_new, end_addr_new);
355                 flash_write(&flag,
356                             (ulong)&(flash_addr_new->flags),
357                             sizeof(flash_addr_new->flags));
358                 flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
359         }
360
361         if (flash_addr->flags != ACTIVE_FLAG &&
362             (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
363                 char flag = ACTIVE_FLAG;
364
365                 gd->env_valid = 2;
366                 flash_sect_protect (0, (ulong)flash_addr, end_addr);
367                 flash_write(&flag,
368                             (ulong)&(flash_addr->flags),
369                             sizeof(flash_addr->flags));
370                 flash_sect_protect (1, (ulong)flash_addr, end_addr);
371         }
372
373         if (gd->env_valid == 2)
374                 puts ("*** Warning - some problems detected "
375                       "reading environment; recovered successfully\n\n");
376 #endif /* CONFIG_ENV_ADDR_REDUND */
377 #ifdef CMD_SAVEENV
378         memcpy (env_ptr, (void*)flash_addr, CONFIG_ENV_SIZE);
379 #endif
380 #endif /* ! ENV_IS_EMBEDDED || CONFIG_ENV_ADDR_REDUND */
381 }