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