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[people/ms/u-boot.git] / board / sandpoint / flash.c
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 <mpc824x.h>
26 #include <asm/processor.h>
27 #include <asm/pci_io.h>
28 #include <w83c553f.h>
29
30 #define ROM_CS0_START 0xFF800000
31 #define ROM_CS1_START 0xFF000000
32
33 flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
34
35 #if defined(CFG_ENV_IS_IN_FLASH)
36 # ifndef CFG_ENV_ADDR
37 # define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET)
38 # endif
39 # ifndef CFG_ENV_SIZE
40 # define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
41 # endif
42 # ifndef CFG_ENV_SECT_SIZE
43 # define CFG_ENV_SECT_SIZE CFG_ENV_SIZE
44 # endif
45 #endif
46
47 /*-----------------------------------------------------------------------
48 * Functions
49 */
50 static int write_word (flash_info_t *info, ulong dest, ulong data);
51 #if 0
52 static void flash_get_offsets (ulong base, flash_info_t *info);
53 #endif /* 0 */
54
55 /*flash command address offsets*/
56
57 #if 0
58 #define ADDR0 (0x555)
59 #define ADDR1 (0x2AA)
60 #define ADDR3 (0x001)
61 #else
62 #define ADDR0 (0xAAA)
63 #define ADDR1 (0x555)
64 #define ADDR3 (0x001)
65 #endif
66
67 #define FLASH_WORD_SIZE unsigned char
68
69 /*-----------------------------------------------------------------------
70 */
71
72 #if 0
73 static int byte_parity_odd(unsigned char x) __attribute__ ((const));
74 #endif /* 0 */
75 static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));
76
77 typedef struct
78 {
79 FLASH_WORD_SIZE extval;
80 unsigned short intval;
81 } map_entry;
82
83 #if 0
84 static int
85 byte_parity_odd(unsigned char x)
86 {
87 x ^= x >> 4;
88 x ^= x >> 2;
89 x ^= x >> 1;
90 return (x & 0x1) != 0;
91 }
92 #endif /* 0 */
93
94
95
96 static unsigned long
97 flash_id(unsigned char mfct, unsigned char chip)
98 {
99 static const map_entry mfct_map[] =
100 {
101 {(FLASH_WORD_SIZE) AMD_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
102 {(FLASH_WORD_SIZE) FUJ_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
103 {(FLASH_WORD_SIZE) STM_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
104 {(FLASH_WORD_SIZE) MT_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
105 {(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
106 {(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
107 };
108
109 static const map_entry chip_map[] =
110 {
111 {AMD_ID_F040B, FLASH_AM040},
112 {(FLASH_WORD_SIZE) STM_ID_x800AB, FLASH_STM800AB}
113 };
114
115 const map_entry *p;
116 unsigned long result = FLASH_UNKNOWN;
117
118 /* find chip id */
119 for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
120 if(p->extval == chip)
121 {
122 result = FLASH_VENDMASK | p->intval;
123 break;
124 }
125
126 /* find vendor id */
127 for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
128 if(p->extval == mfct)
129 {
130 result &= ~FLASH_VENDMASK;
131 result |= (unsigned long) p->intval << 16;
132 break;
133 }
134
135 return result;
136 }
137
138
139
140 unsigned long
141 flash_init(void)
142 {
143 unsigned long i;
144 unsigned char j;
145 static const ulong flash_banks[] = CFG_FLASH_BANKS;
146
147 /* Init: no FLASHes known */
148 for (i = 0; i < CFG_MAX_FLASH_BANKS; i++)
149 {
150 flash_info_t * const pflinfo = &flash_info[i];
151 pflinfo->flash_id = FLASH_UNKNOWN;
152 pflinfo->size = 0;
153 pflinfo->sector_count = 0;
154 }
155
156 /* Enable writes to Sandpoint flash */
157 {
158 register unsigned char temp;
159 CONFIG_READ_BYTE(CFG_WINBOND_ISA_CFG_ADDR + WINBOND_CSCR, temp);
160 temp &= ~0x20; /* clear BIOSWP bit */
161 CONFIG_WRITE_BYTE(CFG_WINBOND_ISA_CFG_ADDR + WINBOND_CSCR, temp);
162 }
163
164 for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++)
165 {
166 flash_info_t * const pflinfo = &flash_info[i];
167 const unsigned long base_address = flash_banks[i];
168 volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;
169 #if 0
170 volatile FLASH_WORD_SIZE * addr2;
171 #endif
172 #if 0
173 /* write autoselect sequence */
174 flash[0x5555] = 0xaa;
175 flash[0x2aaa] = 0x55;
176 flash[0x5555] = 0x90;
177 #else
178 flash[0xAAA << (3 * i)] = 0xaa;
179 flash[0x555 << (3 * i)] = 0x55;
180 flash[0xAAA << (3 * i)] = 0x90;
181 #endif
182 __asm__ __volatile__("sync");
183
184 #if 0
185 pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);
186 #else
187 pflinfo->flash_id = flash_id(flash[0x0], flash[0x2 + 14 * i]);
188 #endif
189
190 switch(pflinfo->flash_id & FLASH_TYPEMASK)
191 {
192 case FLASH_AM040:
193 pflinfo->size = 0x00080000;
194 pflinfo->sector_count = 8;
195 for(j = 0; j < 8; j++)
196 {
197 pflinfo->start[j] = base_address + 0x00010000 * j;
198 pflinfo->protect[j] = flash[(j << 16) | 0x2];
199 }
200 break;
201 case FLASH_STM800AB:
202 pflinfo->size = 0x00100000;
203 pflinfo->sector_count = 19;
204 pflinfo->start[0] = base_address;
205 pflinfo->start[1] = base_address + 0x4000;
206 pflinfo->start[2] = base_address + 0x6000;
207 pflinfo->start[3] = base_address + 0x8000;
208 for(j = 1; j < 16; j++)
209 {
210 pflinfo->start[j+3] = base_address + 0x00010000 * j;
211 }
212 #if 0
213 /* check for protected sectors */
214 for (j = 0; j < pflinfo->sector_count; j++) {
215 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
216 /* D0 = 1 if protected */
217 addr2 = (volatile FLASH_WORD_SIZE *)(pflinfo->start[j]);
218 if (pflinfo->flash_id & FLASH_MAN_SST)
219 pflinfo->protect[j] = 0;
220 else
221 pflinfo->protect[j] = addr2[2] & 1;
222 }
223 #endif
224 break;
225 }
226 /* Protect monitor and environment sectors
227 */
228 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
229 flash_protect(FLAG_PROTECT_SET,
230 CFG_MONITOR_BASE,
231 CFG_MONITOR_BASE + monitor_flash_len - 1,
232 &flash_info[0]);
233 #endif
234
235 #if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
236 flash_protect(FLAG_PROTECT_SET,
237 CFG_ENV_ADDR,
238 CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
239 &flash_info[0]);
240 #endif
241
242 /* reset device to read mode */
243 flash[0x0000] = 0xf0;
244 __asm__ __volatile__("sync");
245 }
246
247 return flash_info[0].size + flash_info[1].size;
248 }
249
250 #if 0
251 static void
252 flash_get_offsets (ulong base, flash_info_t *info)
253 {
254 int i;
255
256 /* set up sector start address table */
257 if (info->flash_id & FLASH_MAN_SST)
258 {
259 for (i = 0; i < info->sector_count; i++)
260 info->start[i] = base + (i * 0x00010000);
261 }
262 else
263 if (info->flash_id & FLASH_BTYPE) {
264 /* set sector offsets for bottom boot block type */
265 info->start[0] = base + 0x00000000;
266 info->start[1] = base + 0x00004000;
267 info->start[2] = base + 0x00006000;
268 info->start[3] = base + 0x00008000;
269 for (i = 4; i < info->sector_count; i++) {
270 info->start[i] = base + (i * 0x00010000) - 0x00030000;
271 }
272 } else {
273 /* set sector offsets for top boot block type */
274 i = info->sector_count - 1;
275 info->start[i--] = base + info->size - 0x00004000;
276 info->start[i--] = base + info->size - 0x00006000;
277 info->start[i--] = base + info->size - 0x00008000;
278 for (; i >= 0; i--) {
279 info->start[i] = base + i * 0x00010000;
280 }
281 }
282
283 }
284 #endif /* 0 */
285
286 /*-----------------------------------------------------------------------
287 */
288 void
289 flash_print_info(flash_info_t *info)
290 {
291 static const char unk[] = "Unknown";
292 const char *mfct = unk, *type = unk;
293 unsigned int i;
294
295 if(info->flash_id != FLASH_UNKNOWN)
296 {
297 switch(info->flash_id & FLASH_VENDMASK)
298 {
299 case FLASH_MAN_AMD: mfct = "AMD"; break;
300 case FLASH_MAN_FUJ: mfct = "FUJITSU"; break;
301 case FLASH_MAN_STM: mfct = "STM"; break;
302 case FLASH_MAN_SST: mfct = "SST"; break;
303 case FLASH_MAN_BM: mfct = "Bright Microelectonics"; break;
304 case FLASH_MAN_INTEL: mfct = "Intel"; break;
305 }
306
307 switch(info->flash_id & FLASH_TYPEMASK)
308 {
309 case FLASH_AM040: type = "AM29F040B (512K * 8, uniform sector size)"; break;
310 case FLASH_AM400B: type = "AM29LV400B (4 Mbit, bottom boot sect)"; break;
311 case FLASH_AM400T: type = "AM29LV400T (4 Mbit, top boot sector)"; break;
312 case FLASH_AM800B: type = "AM29LV800B (8 Mbit, bottom boot sect)"; break;
313 case FLASH_AM800T: type = "AM29LV800T (8 Mbit, top boot sector)"; break;
314 case FLASH_AM160T: type = "AM29LV160T (16 Mbit, top boot sector)"; break;
315 case FLASH_AM320B: type = "AM29LV320B (32 Mbit, bottom boot sect)"; break;
316 case FLASH_AM320T: type = "AM29LV320T (32 Mbit, top boot sector)"; break;
317 case FLASH_STM800AB: type = "M29W800AB (8 Mbit, bottom boot sect)"; break;
318 case FLASH_SST800A: type = "SST39LF/VF800 (8 Mbit, uniform sector size)"; break;
319 case FLASH_SST160A: type = "SST39LF/VF160 (16 Mbit, uniform sector size)"; break;
320 }
321 }
322
323 printf(
324 "\n Brand: %s Type: %s\n"
325 " Size: %lu KB in %d Sectors\n",
326 mfct,
327 type,
328 info->size >> 10,
329 info->sector_count
330 );
331
332 printf (" Sector Start Addresses:");
333
334 for (i = 0; i < info->sector_count; i++)
335 {
336 unsigned long size;
337 unsigned int erased;
338 unsigned long * flash = (unsigned long *) info->start[i];
339
340 /*
341 * Check if whole sector is erased
342 */
343 size =
344 (i != (info->sector_count - 1)) ?
345 (info->start[i + 1] - info->start[i]) >> 2 :
346 (info->start[0] + info->size - info->start[i]) >> 2;
347
348 for(
349 flash = (unsigned long *) info->start[i], erased = 1;
350 (flash != (unsigned long *) info->start[i] + size) && erased;
351 flash++
352 )
353 erased = *flash == ~0x0UL;
354
355 printf(
356 "%s %08lX %s %s",
357 (i % 5) ? "" : "\n ",
358 info->start[i],
359 erased ? "E" : " ",
360 info->protect[i] ? "RO" : " "
361 );
362 }
363
364 puts("\n");
365 return;
366 }
367
368 #if 0
369
370 /*
371 * The following code cannot be run from FLASH!
372 */
373 ulong
374 flash_get_size (vu_long *addr, flash_info_t *info)
375 {
376 short i;
377 FLASH_WORD_SIZE value;
378 ulong base = (ulong)addr;
379 volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
380
381 printf("flash_get_size: \n");
382 /* Write auto select command: read Manufacturer ID */
383 eieio();
384 addr2[ADDR0] = (FLASH_WORD_SIZE)0xAA;
385 addr2[ADDR1] = (FLASH_WORD_SIZE)0x55;
386 addr2[ADDR0] = (FLASH_WORD_SIZE)0x90;
387 value = addr2[0];
388
389 switch (value) {
390 case (FLASH_WORD_SIZE)AMD_MANUFACT:
391 info->flash_id = FLASH_MAN_AMD;
392 break;
393 case (FLASH_WORD_SIZE)FUJ_MANUFACT:
394 info->flash_id = FLASH_MAN_FUJ;
395 break;
396 case (FLASH_WORD_SIZE)SST_MANUFACT:
397 info->flash_id = FLASH_MAN_SST;
398 break;
399 default:
400 info->flash_id = FLASH_UNKNOWN;
401 info->sector_count = 0;
402 info->size = 0;
403 return (0); /* no or unknown flash */
404 }
405 printf("recognised manufacturer");
406
407 value = addr2[ADDR3]; /* device ID */
408 debug ("\ndev_code=%x\n", value);
409
410 switch (value) {
411 case (FLASH_WORD_SIZE)AMD_ID_LV400T:
412 info->flash_id += FLASH_AM400T;
413 info->sector_count = 11;
414 info->size = 0x00080000;
415 break; /* => 0.5 MB */
416
417 case (FLASH_WORD_SIZE)AMD_ID_LV400B:
418 info->flash_id += FLASH_AM400B;
419 info->sector_count = 11;
420 info->size = 0x00080000;
421 break; /* => 0.5 MB */
422
423 case (FLASH_WORD_SIZE)AMD_ID_LV800T:
424 info->flash_id += FLASH_AM800T;
425 info->sector_count = 19;
426 info->size = 0x00100000;
427 break; /* => 1 MB */
428
429 case (FLASH_WORD_SIZE)AMD_ID_LV800B:
430 info->flash_id += FLASH_AM800B;
431 info->sector_count = 19;
432 info->size = 0x00100000;
433 break; /* => 1 MB */
434
435 case (FLASH_WORD_SIZE)AMD_ID_LV160T:
436 info->flash_id += FLASH_AM160T;
437 info->sector_count = 35;
438 info->size = 0x00200000;
439 break; /* => 2 MB */
440
441 case (FLASH_WORD_SIZE)AMD_ID_LV160B:
442 info->flash_id += FLASH_AM160B;
443 info->sector_count = 35;
444 info->size = 0x00200000;
445 break; /* => 2 MB */
446
447 case (FLASH_WORD_SIZE)SST_ID_xF800A:
448 info->flash_id += FLASH_SST800A;
449 info->sector_count = 16;
450 info->size = 0x00100000;
451 break; /* => 1 MB */
452
453 case (FLASH_WORD_SIZE)SST_ID_xF160A:
454 info->flash_id += FLASH_SST160A;
455 info->sector_count = 32;
456 info->size = 0x00200000;
457 break; /* => 2 MB */
458
459 case (FLASH_WORD_SIZE)AMD_ID_F040B:
460 info->flash_id += FLASH_AM040;
461 info->sector_count = 8;
462 info->size = 0x00080000;
463 break; /* => 0.5 MB */
464
465 default:
466 info->flash_id = FLASH_UNKNOWN;
467 return (0); /* => no or unknown flash */
468
469 }
470
471 printf("flash id %lx; sector count %x, size %lx\n", info->flash_id,info->sector_count,info->size);
472 /* set up sector start address table */
473 if (info->flash_id & FLASH_MAN_SST)
474 {
475 for (i = 0; i < info->sector_count; i++)
476 info->start[i] = base + (i * 0x00010000);
477 }
478 else
479 if (info->flash_id & FLASH_BTYPE) {
480 /* set sector offsets for bottom boot block type */
481 info->start[0] = base + 0x00000000;
482 info->start[1] = base + 0x00004000;
483 info->start[2] = base + 0x00006000;
484 info->start[3] = base + 0x00008000;
485 for (i = 4; i < info->sector_count; i++) {
486 info->start[i] = base + (i * 0x00010000) - 0x00030000;
487 }
488 } else {
489 /* set sector offsets for top boot block type */
490 i = info->sector_count - 1;
491 info->start[i--] = base + info->size - 0x00004000;
492 info->start[i--] = base + info->size - 0x00006000;
493 info->start[i--] = base + info->size - 0x00008000;
494 for (; i >= 0; i--) {
495 info->start[i] = base + i * 0x00010000;
496 }
497 }
498
499 /* check for protected sectors */
500 for (i = 0; i < info->sector_count; i++) {
501 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
502 /* D0 = 1 if protected */
503 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
504 if (info->flash_id & FLASH_MAN_SST)
505 info->protect[i] = 0;
506 else
507 info->protect[i] = addr2[2] & 1;
508 }
509
510 /*
511 * Prevent writes to uninitialized FLASH.
512 */
513 if (info->flash_id != FLASH_UNKNOWN) {
514 addr2 = (FLASH_WORD_SIZE *)info->start[0];
515 *addr2 = (FLASH_WORD_SIZE)0x00F000F0; /* reset bank */
516 }
517
518 return (info->size);
519 }
520
521 #endif
522
523
524 int
525 flash_erase(flash_info_t *info, int s_first, int s_last)
526 {
527 volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
528 int flag, prot, sect, l_sect;
529 ulong start, now, last;
530 unsigned char sh8b;
531
532 if ((s_first < 0) || (s_first > s_last)) {
533 if (info->flash_id == FLASH_UNKNOWN) {
534 printf ("- missing\n");
535 } else {
536 printf ("- no sectors to erase\n");
537 }
538 return 1;
539 }
540
541 if ((info->flash_id == FLASH_UNKNOWN) ||
542 (info->flash_id > (FLASH_MAN_STM | FLASH_AMD_COMP))) {
543 printf ("Can't erase unknown flash type - aborted\n");
544 return 1;
545 }
546
547 prot = 0;
548 for (sect=s_first; sect<=s_last; ++sect) {
549 if (info->protect[sect]) {
550 prot++;
551 }
552 }
553
554 if (prot) {
555 printf ("- Warning: %d protected sectors will not be erased!\n",
556 prot);
557 } else {
558 printf ("\n");
559 }
560
561 l_sect = -1;
562
563 /* Check the ROM CS */
564 if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
565 sh8b = 3;
566 else
567 sh8b = 0;
568
569 /* Disable interrupts which might cause a timeout here */
570 flag = disable_interrupts();
571
572 addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
573 addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
574 addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
575 addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
576 addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
577
578 /* Start erase on unprotected sectors */
579 for (sect = s_first; sect<=s_last; sect++) {
580 if (info->protect[sect] == 0) { /* not protected */
581 addr = (FLASH_WORD_SIZE *)(info->start[0] + (
582 (info->start[sect] - info->start[0]) << sh8b));
583 if (info->flash_id & FLASH_MAN_SST)
584 {
585 addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
586 addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
587 addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
588 addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
589 addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
590 addr[0] = (FLASH_WORD_SIZE)0x00500050; /* block erase */
591 udelay(30000); /* wait 30 ms */
592 }
593 else
594 addr[0] = (FLASH_WORD_SIZE)0x00300030; /* sector erase */
595 l_sect = sect;
596 }
597 }
598
599 /* re-enable interrupts if necessary */
600 if (flag)
601 enable_interrupts();
602
603 /* wait at least 80us - let's wait 1 ms */
604 udelay (1000);
605
606 /*
607 * We wait for the last triggered sector
608 */
609 if (l_sect < 0)
610 goto DONE;
611
612 start = get_timer (0);
613 last = start;
614 addr = (FLASH_WORD_SIZE *)(info->start[0] + (
615 (info->start[l_sect] - info->start[0]) << sh8b));
616 while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
617 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
618 printf ("Timeout\n");
619 return 1;
620 }
621 /* show that we're waiting */
622 if ((now - last) > 1000) { /* every second */
623 serial_putc ('.');
624 last = now;
625 }
626 }
627
628 DONE:
629 /* reset to read mode */
630 addr = (FLASH_WORD_SIZE *)info->start[0];
631 addr[0] = (FLASH_WORD_SIZE)0x00F000F0; /* reset bank */
632
633 printf (" done\n");
634 return 0;
635 }
636
637 /*-----------------------------------------------------------------------
638 * Copy memory to flash, returns:
639 * 0 - OK
640 * 1 - write timeout
641 * 2 - Flash not erased
642 */
643
644 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
645 {
646 ulong cp, wp, data;
647 int i, l, rc;
648
649 wp = (addr & ~3); /* get lower word aligned address */
650
651 /*
652 * handle unaligned start bytes
653 */
654 if ((l = addr - wp) != 0) {
655 data = 0;
656 for (i=0, cp=wp; i<l; ++i, ++cp) {
657 data = (data << 8) | (*(uchar *)cp);
658 }
659 for (; i<4 && cnt>0; ++i) {
660 data = (data << 8) | *src++;
661 --cnt;
662 ++cp;
663 }
664 for (; cnt==0 && i<4; ++i, ++cp) {
665 data = (data << 8) | (*(uchar *)cp);
666 }
667
668 if ((rc = write_word(info, wp, data)) != 0) {
669 return (rc);
670 }
671 wp += 4;
672 }
673
674 /*
675 * handle word aligned part
676 */
677 while (cnt >= 4) {
678 data = 0;
679 for (i=0; i<4; ++i) {
680 data = (data << 8) | *src++;
681 }
682 if ((rc = write_word(info, wp, data)) != 0) {
683 return (rc);
684 }
685 wp += 4;
686 cnt -= 4;
687 }
688
689 if (cnt == 0) {
690 return (0);
691 }
692
693 /*
694 * handle unaligned tail bytes
695 */
696 data = 0;
697 for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
698 data = (data << 8) | *src++;
699 --cnt;
700 }
701 for (; i<4; ++i, ++cp) {
702 data = (data << 8) | (*(uchar *)cp);
703 }
704
705 return (write_word(info, wp, data));
706 }
707
708 /*-----------------------------------------------------------------------
709 * Write a word to Flash, returns:
710 * 0 - OK
711 * 1 - write timeout
712 * 2 - Flash not erased
713 */
714 static int write_word (flash_info_t *info, ulong dest, ulong data)
715 {
716 volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)info->start[0];
717 volatile FLASH_WORD_SIZE *dest2;
718 volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
719 ulong start;
720 int flag;
721 int i;
722 unsigned char sh8b;
723
724 /* Check the ROM CS */
725 if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
726 sh8b = 3;
727 else
728 sh8b = 0;
729
730 dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
731 info->start[0]);
732
733 /* Check if Flash is (sufficiently) erased */
734 if ((*dest2 & (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
735 return (2);
736 }
737 /* Disable interrupts which might cause a timeout here */
738 flag = disable_interrupts();
739
740 for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
741 {
742 addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
743 addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
744 addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;
745
746 dest2[i << sh8b] = data2[i];
747
748 /* re-enable interrupts if necessary */
749 if (flag)
750 enable_interrupts();
751
752 /* data polling for D7 */
753 start = get_timer (0);
754 while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
755 (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
756 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
757 return (1);
758 }
759 }
760 }
761
762 return (0);
763 }
764
765 /*-----------------------------------------------------------------------
766 */
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