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1 /*
2  * (C) Copyright 2000
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23
24 #include <common.h>
25 #include <mpc8xx.h>
26
27 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
28
29 /*-----------------------------------------------------------------------
30  * Functions
31  */
32 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
33 static int write_word (flash_info_t *info, ulong dest, ulong data);
34 static void flash_get_offsets (ulong base, flash_info_t *info);
35
36 /*-----------------------------------------------------------------------
37  */
38
39 unsigned long flash_init (void)
40 {
41         unsigned long size_b0, size_b1;
42         int i;
43
44         /* Init: no FLASHes known */
45         for (i=0; i < CFG_MAX_FLASH_BANKS; ++i)
46             flash_info[i].flash_id = FLASH_UNKNOWN;
47
48         /* Detect size */
49         size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
50
51         /* Setup offsets */
52         flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
53
54 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
55         /* Monitor protection ON by default */
56         flash_protect(FLAG_PROTECT_SET,
57                       CFG_MONITOR_BASE,
58                       CFG_MONITOR_BASE+monitor_flash_len-1,
59                       &flash_info[0]);
60 #endif
61
62         size_b1 = 0 ;
63
64         flash_info[1].flash_id = FLASH_UNKNOWN;
65         flash_info[1].sector_count = -1;
66
67         flash_info[0].size = size_b0;
68         flash_info[1].size = size_b1;
69
70         return (size_b0 + size_b1);
71 }
72
73 /*-----------------------------------------------------------------------
74  * Fix this to support variable sector sizes
75 */
76 static void flash_get_offsets (ulong base, flash_info_t *info)
77 {
78         int i;
79
80         /* set up sector start address table */
81         if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
82                 /* set sector offsets for bottom boot block type        */
83                 for (i = 0; i < info->sector_count; i++)
84                         info->start[i] = base + (i * 0x00010000);
85         }
86 }
87
88 /*-----------------------------------------------------------------------
89  */
90 void flash_print_info  (flash_info_t *info)
91 {
92         int i;
93
94         if (info->flash_id == FLASH_UNKNOWN)
95         {
96                 puts ("missing or unknown FLASH type\n");
97                 return;
98         }
99
100         switch (info->flash_id & FLASH_VENDMASK)
101         {
102                 case FLASH_MAN_AMD:     printf ("AMD ");                break;
103                 case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
104                 case FLASH_MAN_BM:      printf ("BRIGHT MICRO ");       break;
105                 default:                printf ("Unknown Vendor ");     break;
106         }
107
108         switch (info->flash_id & FLASH_TYPEMASK)
109         {
110                 case FLASH_AM040:       printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
111                         break;
112                 case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
113                                         break;
114                 case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
115                                         break;
116                 case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
117                                         break;
118                 case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
119                                         break;
120                 case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
121                                         break;
122                 case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
123                                         break;
124                 case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
125                                         break;
126                 case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
127                                         break;
128                 default:                printf ("Unknown Chip Type\n");
129                                         break;
130         }
131
132         if (info->size >> 20) {
133             printf ("  Size: %ld MB in %d Sectors\n",
134                 info->size >> 20,
135                 info->sector_count);
136         } else {
137             printf ("  Size: %ld KB in %d Sectors\n",
138                 info->size >> 10,
139                 info->sector_count);
140         }
141
142         puts ("  Sector Start Addresses:");
143
144         for (i=0; i<info->sector_count; ++i)
145         {
146                 if ((i % 5) == 0)
147                 {
148                         puts ("\n   ");
149                 }
150
151                 printf (" %08lX%s",
152                         info->start[i],
153                         info->protect[i] ? " (RO)" : "     ");
154         }
155
156         putc ('\n');
157         return;
158 }
159 /*-----------------------------------------------------------------------
160  */
161
162 /*
163  * The following code cannot be run from FLASH!
164  */
165
166 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
167 {
168         short i;
169         volatile unsigned char *caddr;
170         char value;
171
172         caddr = (volatile unsigned char *)addr ;
173
174         /* Write auto select command: read Manufacturer ID */
175
176 #if 0
177         printf("Base address is: %08x\n", caddr);
178 #endif
179
180         caddr[0x0555] = 0xAA;
181         caddr[0x02AA] = 0x55;
182         caddr[0x0555] = 0x90;
183
184         value = caddr[0];
185
186 #if 0
187         printf("Manufact ID: %02x\n", value);
188 #endif
189         switch (value)
190         {
191                 case 0x1: /* AMD_MANUFACT */
192                         info->flash_id = FLASH_MAN_AMD;
193                 break;
194
195                 case 0x4: /* FUJ_MANUFACT */
196                         info->flash_id = FLASH_MAN_FUJ;
197                 break;
198
199                 default:
200                         info->flash_id = FLASH_UNKNOWN;
201                         info->sector_count = 0;
202                         info->size = 0;
203                         break;
204         }
205
206         value = caddr[1];                       /* device ID            */
207 #if 0
208         printf("Device ID: %02x\n", value);
209 #endif
210         switch (value)
211         {
212                 case AMD_ID_LV040B:
213                         info->flash_id += FLASH_AM040;
214                         info->sector_count = 8;
215                         info->size = 0x00080000;
216                         break;                          /* => 512Kb             */
217
218                 default:
219                         info->flash_id = FLASH_UNKNOWN;
220                         return (0);                     /* => no or unknown flash */
221
222         }
223
224         flash_get_offsets ((ulong)addr, &flash_info[0]);
225
226         /* check for protected sectors */
227         for (i = 0; i < info->sector_count; i++)
228         {
229                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
230                 /* D0 = 1 if protected */
231                 caddr = (volatile unsigned char *)(info->start[i]);
232                 info->protect[i] = caddr[2] & 1;
233         }
234
235         /*
236          * Prevent writes to uninitialized FLASH.
237          */
238         if (info->flash_id != FLASH_UNKNOWN)
239         {
240                 caddr = (volatile unsigned char *)info->start[0];
241                 *caddr = 0xF0;  /* reset bank */
242         }
243
244         return (info->size);
245 }
246
247
248 /*-----------------------------------------------------------------------
249  */
250
251 int     flash_erase (flash_info_t *info, int s_first, int s_last)
252 {
253         volatile unsigned char *addr = (volatile unsigned char *)(info->start[0]);
254         int flag, prot, sect, l_sect;
255         ulong start, now, last;
256
257         if ((s_first < 0) || (s_first > s_last)) {
258                 if (info->flash_id == FLASH_UNKNOWN) {
259                         printf ("- missing\n");
260                 } else {
261                         printf ("- no sectors to erase\n");
262                 }
263                 return 1;
264         }
265
266         if ((info->flash_id == FLASH_UNKNOWN) ||
267             (info->flash_id > FLASH_AMD_COMP)) {
268                 printf ("Can't erase unknown flash type - aborted\n");
269                 return 1;
270         }
271
272         prot = 0;
273         for (sect=s_first; sect<=s_last; ++sect) {
274                 if (info->protect[sect]) {
275                         prot++;
276                 }
277         }
278
279         if (prot) {
280                 printf ("- Warning: %d protected sectors will not be erased!\n",
281                         prot);
282         } else {
283                 printf ("\n");
284         }
285
286         l_sect = -1;
287
288         /* Disable interrupts which might cause a timeout here */
289         flag = disable_interrupts();
290
291         addr[0x0555] = 0xAA;
292         addr[0x02AA] = 0x55;
293         addr[0x0555] = 0x80;
294         addr[0x0555] = 0xAA;
295         addr[0x02AA] = 0x55;
296
297         /* Start erase on unprotected sectors */
298         for (sect = s_first; sect<=s_last; sect++) {
299                 if (info->protect[sect] == 0) { /* not protected */
300                         addr = (volatile unsigned char *)(info->start[sect]);
301                         addr[0] = 0x30;
302                         l_sect = sect;
303                 }
304         }
305
306         /* re-enable interrupts if necessary */
307         if (flag)
308                 enable_interrupts();
309
310         /* wait at least 80us - let's wait 1 ms */
311         udelay (1000);
312
313         /*
314          * We wait for the last triggered sector
315          */
316         if (l_sect < 0)
317                 goto DONE;
318
319         start = get_timer (0);
320         last  = start;
321         addr = (volatile unsigned char *)(info->start[l_sect]);
322
323         while ((addr[0] & 0xFF) != 0xFF)
324         {
325                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
326                         printf ("Timeout\n");
327                         return 1;
328                 }
329                 /* show that we're waiting */
330                 if ((now - last) > 1000) {      /* every second */
331                         putc ('.');
332                         last = now;
333                 }
334         }
335
336 DONE:
337         /* reset to read mode */
338         addr = (volatile unsigned char *)info->start[0];
339
340         addr[0] = 0xF0; /* reset bank */
341
342         printf (" done\n");
343         return 0;
344 }
345
346 /*-----------------------------------------------------------------------
347  * Copy memory to flash, returns:
348  * 0 - OK
349  * 1 - write timeout
350  * 2 - Flash not erased
351  */
352
353 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
354 {
355         ulong cp, wp, data;
356         int i, l, rc;
357
358         wp = (addr & ~3);       /* get lower word aligned address */
359
360         /*
361          * handle unaligned start bytes
362          */
363         if ((l = addr - wp) != 0) {
364                 data = 0;
365                 for (i=0, cp=wp; i<l; ++i, ++cp) {
366                         data = (data << 8) | (*(uchar *)cp);
367                 }
368                 for (; i<4 && cnt>0; ++i) {
369                         data = (data << 8) | *src++;
370                         --cnt;
371                         ++cp;
372                 }
373                 for (; cnt==0 && i<4; ++i, ++cp) {
374                         data = (data << 8) | (*(uchar *)cp);
375                 }
376
377                 if ((rc = write_word(info, wp, data)) != 0) {
378                         return (rc);
379                 }
380                 wp += 4;
381         }
382
383         /*
384          * handle word aligned part
385          */
386         while (cnt >= 4) {
387                 data = 0;
388                 for (i=0; i<4; ++i) {
389                         data = (data << 8) | *src++;
390                 }
391                 if ((rc = write_word(info, wp, data)) != 0) {
392                         return (rc);
393                 }
394                 wp  += 4;
395                 cnt -= 4;
396         }
397
398         if (cnt == 0) {
399                 return (0);
400         }
401
402         /*
403          * handle unaligned tail bytes
404          */
405         data = 0;
406         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
407                 data = (data << 8) | *src++;
408                 --cnt;
409         }
410         for (; i<4; ++i, ++cp) {
411                 data = (data << 8) | (*(uchar *)cp);
412         }
413
414         return (write_word(info, wp, data));
415 }
416
417 /*-----------------------------------------------------------------------
418  * Write a word to Flash, returns:
419  * 0 - OK
420  * 1 - write timeout
421  * 2 - Flash not erased
422  */
423 static int write_word (flash_info_t *info, ulong dest, ulong data)
424 {
425         volatile unsigned char *addr = (volatile unsigned char*)(info->start[0]),
426                                 *cdest,*cdata;
427         ulong start;
428         int flag, count = 4 ;
429
430         cdest = (volatile unsigned char *)dest ;
431         cdata = (volatile unsigned char *)&data ;
432
433         /* Check if Flash is (sufficiently) erased */
434         if ((*((vu_long *)dest) & data) != data) {
435                 return (2);
436         }
437
438         while(count--)
439         {
440             /* Disable interrupts which might cause a timeout here */
441             flag = disable_interrupts();
442
443             addr[0x0555] = 0xAA;
444             addr[0x02AA] = 0x55;
445             addr[0x0555] = 0xA0;
446
447             *cdest = *cdata;
448
449             /* re-enable interrupts if necessary */
450             if (flag)
451                 enable_interrupts();
452
453             /* data polling for D7 */
454             start = get_timer (0);
455             while ((*cdest ^ *cdata) & 0x80)
456             {
457                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
458                         return (1);
459                 }
460             }
461
462             cdata++ ;
463             cdest++ ;
464         }
465         return (0);
466 }
467
468 /*-----------------------------------------------------------------------
469  */