blob: 2d2bf1c8e8fd0efc8576087fc678150c4a44d9b6 [file] [log] [blame]
wdenk7ebf7442002-11-02 23:17:16 +00001/*
2 * (C) Copyright 2001
3 * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
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/*
25 * flash.c - flash support for the 512k, 8bit boot flash on the GEVB
26 * most of this file was based on the existing U-Boot
27 * flash drivers.
28 */
29
30#include <common.h>
31#include <mpc8xx.h>
32#include <galileo/gt64260R.h>
33#include <galileo/memory.h>
34#include "intel_flash.h"
35
36#define FLASH_ROM 0xFFFD /* unknown flash type */
37#define FLASH_RAM 0xFFFE /* unknown flash type */
38#define FLASH_MAN_UNKNOWN 0xFFFF0000
39
40/* #define DEBUG */
41/* #define FLASH_ID_OVERRIDE */ /* Hack to set type to 040B if ROM emulator is installed.
42 * Can be used to program a ROM in circuit if a programmer
43 * is not available by swapping the rom out. */
44
45/* Intel flash commands */
46int flash_erase_intel(flash_info_t *info, int s_first, int s_last);
47int write_word_intel(bank_addr_t addr, bank_word_t value);
48
49flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
50
51/*-----------------------------------------------------------------------
52 * Functions
53 */
54static ulong flash_get_size (int portwidth, vu_long *addr, flash_info_t *info);
55static int write_word (flash_info_t *info, ulong dest, ulong data);
56static void flash_get_offsets (ulong base, flash_info_t *info);
57
58/*-----------------------------------------------------------------------
59 */
60
61unsigned long
62flash_init (void)
63{
64 unsigned int i;
65 unsigned long size_b0 = 0, size_b1 = 0;
66 unsigned long base, flash_size;
67
68 /* Init: no FLASHes known */
69 for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
70 flash_info[i].flash_id = FLASH_UNKNOWN;
71 }
72
73 /* the boot flash */
74 base = CFG_FLASH_BASE;
75 size_b0 = flash_get_size(1, (vu_long *)base, &flash_info[0]);
76
77 printf("[%ldkB@%lx] ", size_b0/1024, base);
78
79 if (flash_info[0].flash_id == FLASH_UNKNOWN) {
80 printf ("## Unknown FLASH at %08lx: Size = 0x%08lx = %ld MB\n",
81 base, size_b0, size_b0<<20);
82 }
83
84 base = memoryGetDeviceBaseAddress(CFG_EXTRA_FLASH_DEVICE);
85 for(i=1;i<CFG_MAX_FLASH_BANKS;i++) {
86 unsigned long size = flash_get_size(CFG_EXTRA_FLASH_WIDTH, (vu_long *)base, &flash_info[i]);
87
88 printf("[%ldMB@%lx] ", size>>20, base);
89
90 if (flash_info[i].flash_id == FLASH_UNKNOWN) {
91 if(i==1) {
92 printf ("## Unknown FLASH at %08lx: Size = 0x%08lx = %ld MB\n",
93 base, size_b1, size_b1<<20);
94 }
95 break;
96 }
97 size_b1+=size;
98 base+=size;
99 }
100
101 flash_size = size_b0 + size_b1;
102 return flash_size;
103}
104
105/*-----------------------------------------------------------------------
106 */
107static void
108flash_get_offsets (ulong base, flash_info_t *info)
109{
110 int i;
111 int sector_size;
112
113 if(!info->sector_count) return;
114
115 /* set up sector start address table */
116 switch(info->flash_id & FLASH_TYPEMASK) {
117 case FLASH_AM040:
118 case FLASH_28F128J3A:
119 case FLASH_28F640J3A:
120 case FLASH_RAM:
121 /* this chip has uniformly spaced sectors */
122 sector_size=info->size/info->sector_count;
123 for (i = 0; i < info->sector_count; i++)
124 info->start[i] = base + (i * sector_size);
125 break;
126 default:
127 if (info->flash_id & FLASH_BTYPE) {
128 /* set sector offsets for bottom boot block type */
129 info->start[0] = base + 0x00000000;
130 info->start[1] = base + 0x00008000;
131 info->start[2] = base + 0x0000C000;
132 info->start[3] = base + 0x00010000;
133 for (i = 4; i < info->sector_count; i++) {
134 info->start[i] = base + (i * 0x00020000) - 0x00060000;
135 }
136 } else {
137 /* set sector offsets for top boot block type */
138 i = info->sector_count - 1;
139 info->start[i--] = base + info->size - 0x00008000;
140 info->start[i--] = base + info->size - 0x0000C000;
141 info->start[i--] = base + info->size - 0x00010000;
142 for (; i >= 0; i--) {
143 info->start[i] = base + i * 0x00020000;
144 }
145 }
146 }
147}
148
149/*-----------------------------------------------------------------------
150 */
151void
152flash_print_info (flash_info_t *info)
153{
154 int i;
155
156 if (info->flash_id == FLASH_UNKNOWN) {
157 printf ("missing or unknown FLASH type\n");
158 return;
159 }
160
161 switch (info->flash_id & FLASH_VENDMASK) {
162 case FLASH_MAN_AMD: printf ("AMD "); break;
163 case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
164 case FLASH_MAN_INTEL: printf ("INTEL "); break;
165 default: printf ("Unknown Vendor "); break;
166 }
167
168 switch (info->flash_id & FLASH_TYPEMASK) {
169 case FLASH_AM040:
170 printf ("AM29LV040B (4 Mbit, bottom boot sect)\n");
171 break;
172 case FLASH_AM400B:
173 printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
174 break;
175 case FLASH_AM400T:
176 printf ("AM29LV400T (4 Mbit, top boot sector)\n");
177 break;
178 case FLASH_AM800B:
179 printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
180 break;
181 case FLASH_AM800T:
182 printf ("AM29LV800T (8 Mbit, top boot sector)\n");
183 break;
184 case FLASH_AM160B:
185 printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
186 break;
187 case FLASH_AM160T:
188 printf ("AM29LV160T (16 Mbit, top boot sector)\n");
189 break;
190 case FLASH_AM320B:
191 printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
192 break;
193 case FLASH_AM320T:
194 printf ("AM29LV320T (32 Mbit, top boot sector)\n");
195 break;
196 case FLASH_28F640J3A:
197 printf ("28F640J3A (64 Mbit)\n");
198 break;
199 case FLASH_28F128J3A:
200 printf ("28F128J3A (128 Mbit)\n");
201 break;
202 case FLASH_ROM:
203 printf ("ROM\n");
204 break;
205 case FLASH_RAM:
206 printf ("RAM\n");
207 break;
208 default:
209 printf ("Unknown Chip Type\n");
210 break;
211 }
212
213 puts (" Size: ");
214 print_size (info->size, "");
215 printf (" in %d Sectors\n", info->sector_count);
216
217 printf (" Sector Start Addresses:");
218 for (i=0; i<info->sector_count; ++i) {
219 if ((i % 5) == 0)
220 printf ("\n ");
221 printf (" %08lX%s",
222 info->start[i],
223 info->protect[i] ? " (RO)" : " "
224 );
225 }
226 printf ("\n");
227 return;
228}
229
230/*-----------------------------------------------------------------------
231 */
232
233
234/*-----------------------------------------------------------------------
235 */
236
237/*
238 * The following code cannot be run from FLASH!
239 */
240
241static inline void flash_cmd(int width, volatile unsigned char *addr, int offset, unsigned char cmd)
242{
243 /* supports 1x8, 1x16, and 2x16 */
244 /* 2x8 and 4x8 are not supported */
245 if(width==4) {
246 /* assuming chips are in 16 bit mode */
247 /* 2x16 */
248 unsigned long cmd32=(cmd<<16)|cmd;
249 *(volatile unsigned long *)(addr+offset*2)=cmd32;
250 } else {
251 /* 1x16 or 1x8 */
252 *(volatile unsigned char *)(addr+offset)=cmd;
253 }
254}
255
256static ulong
257flash_get_size (int portwidth, vu_long *addr, flash_info_t *info)
258{
259 short i;
260 volatile unsigned char *caddr = (unsigned char *)addr;
261 volatile unsigned short *saddr = (unsigned short *)addr;
262 volatile unsigned long *laddr = (unsigned long *)addr;
263 char old[2], save;
264 ulong id, manu, base = (ulong)addr;
265
266 info->portwidth=portwidth;
267
268 save = *caddr;
269
270 flash_cmd(portwidth,caddr,0,0xf0);
271 flash_cmd(portwidth,caddr,0,0xf0);
272
273 udelay(10);
274
275 old[0] = caddr[0];
276 old[1] = caddr[1];
277
278
279 if(old[0]!=0xf0) {
280 flash_cmd(portwidth,caddr,0,0xf0);
281 flash_cmd(portwidth,caddr,0,0xf0);
282
283 udelay(10);
284
285 if(*caddr==0xf0) {
286 /* this area is ROM */
287 *caddr=save;
288#ifndef FLASH_ID_OVERRIDE
289 info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
290 info->sector_count = 8;
291 info->size = 0x80000;
292#else
293 info->flash_id = FLASH_MAN_AMD + FLASH_AM040;
294 info->sector_count = 8;
295 info->size = 0x80000;
296 info->chipwidth=1;
297#endif
298 flash_get_offsets(base, info);
299 return info->size;
300 }
301 } else {
302 *caddr=0;
303
304 udelay(10);
305
306 if(*caddr==0) {
307 /* this area is RAM */
308 *caddr=save;
309 info->flash_id = FLASH_RAM + FLASH_MAN_UNKNOWN;
310 info->sector_count = 8;
311 info->size = 0x80000;
312 flash_get_offsets(base, info);
313 return info->size;
314 }
315 flash_cmd(portwidth,caddr,0,0xf0);
316
317 udelay(10);
318 }
319
320 /* Write auto select command: read Manufacturer ID */
321 flash_cmd(portwidth,caddr,0x555,0xAA);
322 flash_cmd(portwidth,caddr,0x2AA,0x55);
323 flash_cmd(portwidth,caddr,0x555,0x90);
324
325 udelay(10);
326
327 if ((caddr[0] == old[0]) &&
328 (caddr[1] == old[1])) {
329
330 /* this area is ROM */
331#ifndef FLASH_ID_OVERRIDE
332 info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
333 info->sector_count = 8;
334 info->size = 0x80000;
335#else
336 info->flash_id = FLASH_MAN_AMD + FLASH_AM040;
337 info->sector_count = 8;
338 info->size = 0x80000;
339 info->chipwidth=1;
340#endif
341 flash_get_offsets(base, info);
342 return info->size;
343#ifdef DEBUG
344 } else {
345 printf("%px%d: %02x:%02x -> %02x:%02x\n",
346 caddr, portwidth, old[0], old[1],
347 caddr[0], caddr[1]);
348#endif
349 }
350
351 switch(portwidth) {
352 case 1:
353 manu = caddr[0];
354 manu |= manu<<16;
355 id = caddr[1];
356 break;
357 case 2:
358 manu = saddr[0];
359 manu |= manu<<16;
360 id = saddr[1];
361 id |= id<<16;
362 break;
363 case 4:
364 manu = laddr[0];
365 id = laddr[1];
366 break;
367 default:
368 id = manu = -1;
369 break;
370 }
371
372#ifdef DEBUG
373 printf("\n%08lx:%08lx:%08lx\n", base, manu, id);
374 printf("%08lx %08lx %08lx %08lx\n",
375 laddr[0],laddr[1],laddr[2],laddr[3]);
376#endif
377
378 switch (manu) {
379 case AMD_MANUFACT:
380 info->flash_id = FLASH_MAN_AMD;
381 break;
382 case FUJ_MANUFACT:
383 info->flash_id = FLASH_MAN_FUJ;
384 break;
385 case INTEL_MANUFACT:
386 info->flash_id = FLASH_MAN_INTEL;
387 break;
388 default:
389 printf("Unknown Mfr [%08lx]:%08lx\n", manu, id);
390 info->flash_id = FLASH_UNKNOWN;
391 info->sector_count = 0;
392 info->size = 0;
393 return (0); /* no or unknown flash */
394 }
395
396 switch (id) {
397 case AMD_ID_LV400T:
398 info->flash_id += FLASH_AM400T;
399 info->sector_count = 11;
400 info->size = 0x00100000;
401 info->chipwidth=1;
402 break; /* => 1 MB */
403
404 case AMD_ID_LV400B:
405 info->flash_id += FLASH_AM400B;
406 info->sector_count = 11;
407 info->size = 0x00100000;
408 info->chipwidth=1;
409 break; /* => 1 MB */
410
411 case AMD_ID_LV800T:
412 info->flash_id += FLASH_AM800T;
413 info->sector_count = 19;
414 info->size = 0x00200000;
415 info->chipwidth=1;
416 break; /* => 2 MB */
417
418 case AMD_ID_LV800B:
419 info->flash_id += FLASH_AM800B;
420 info->sector_count = 19;
421 info->size = 0x00200000;
422 info->chipwidth=1;
423 break; /* => 2 MB */
424
425 case AMD_ID_LV160T:
426 info->flash_id += FLASH_AM160T;
427 info->sector_count = 35;
428 info->size = 0x00400000;
429 info->chipwidth=1;
430 break; /* => 4 MB */
431
432 case AMD_ID_LV160B:
433 info->flash_id += FLASH_AM160B;
434 info->sector_count = 35;
435 info->size = 0x00400000;
436 info->chipwidth=1;
437 break; /* => 4 MB */
438#if 0 /* enable when device IDs are available */
439 case AMD_ID_LV320T:
440 info->flash_id += FLASH_AM320T;
441 info->sector_count = 67;
442 info->size = 0x00800000;
443 break; /* => 8 MB */
444
445 case AMD_ID_LV320B:
446 info->flash_id += FLASH_AM320B;
447 info->sector_count = 67;
448 info->size = 0x00800000;
449 break; /* => 8 MB */
450#endif
451 case AMD_ID_LV040B:
452 info->flash_id += FLASH_AM040;
453 info->sector_count = 8;
454 info->size = 0x80000;
455 info->chipwidth=1;
456 break;
457
458 case INTEL_ID_28F640J3A:
459 info->flash_id += FLASH_28F640J3A;
460 info->sector_count = 64;
461 info->size = 128*1024 * 64; /* 128kbytes x 64 blocks */
462 info->chipwidth=2;
463 if(portwidth==4) info->size*=2; /* 2x16 */
464 break;
465
466 case INTEL_ID_28F128J3A:
467 info->flash_id += FLASH_28F128J3A;
468 info->sector_count = 128;
469 info->size = 128*1024 * 128; /* 128kbytes x 128 blocks */
470 info->chipwidth=2;
471 if(portwidth==4) info->size*=2; /* 2x16 */
472 break;
473
474 default:
475 printf("Unknown id %lx:[%lx]\n", manu, id);
476 info->flash_id = FLASH_UNKNOWN;
477 info->chipwidth=1;
478 return (0); /* => no or unknown flash */
479
480 }
481
482 flash_get_offsets(base, info);
483
484#if 0
485 /* set up sector start address table */
486 if (info->flash_id & FLASH_AM040) {
487 /* this chip has uniformly spaced sectors */
488 for (i = 0; i < info->sector_count; i++)
489 info->start[i] = base + (i * 0x00010000);
490
491 } else if (info->flash_id & FLASH_BTYPE) {
492 /* set sector offsets for bottom boot block type */
493 info->start[0] = base + 0x00000000;
494 info->start[1] = base + 0x00008000;
495 info->start[2] = base + 0x0000C000;
496 info->start[3] = base + 0x00010000;
497 for (i = 4; i < info->sector_count; i++) {
498 info->start[i] = base + (i * 0x00020000) - 0x00060000;
499 }
500 } else {
501 /* set sector offsets for top boot block type */
502 i = info->sector_count - 1;
503 info->start[i--] = base + info->size - 0x00008000;
504 info->start[i--] = base + info->size - 0x0000C000;
505 info->start[i--] = base + info->size - 0x00010000;
506 for (; i >= 0; i--) {
507 info->start[i] = base + i * 0x00020000;
508 }
509 }
510#endif
511
512 /* check for protected sectors */
513 for (i = 0; i < info->sector_count; i++) {
514 /* read sector protection at sector address, (A7 .. A0)=0x02 */
515 /* D0 = 1 if protected */
516 caddr = (volatile unsigned char *)(info->start[i]);
517 saddr = (volatile unsigned short *)(info->start[i]);
518 laddr = (volatile unsigned long *)(info->start[i]);
519 if(portwidth==1)
520 info->protect[i] = caddr[2] & 1;
521 else if(portwidth==2)
522 info->protect[i] = saddr[2] & 1;
523 else
524 info->protect[i] = laddr[2] & 1;
525 }
526
527 /*
528 * Prevent writes to uninitialized FLASH.
529 */
530 if (info->flash_id != FLASH_UNKNOWN) {
531 caddr = (volatile unsigned char *)info->start[0];
532
533 flash_cmd(portwidth,caddr,0,0xF0); /* reset bank */
534 }
535
536 return (info->size);
537}
538
539/* TODO: 2x16 unsupported */
540int
541flash_erase (flash_info_t *info, int s_first, int s_last)
542{
543 volatile unsigned char *addr = (char *)(info->start[0]);
544 int flag, prot, sect, l_sect;
545 ulong start, now, last;
546
547 /* TODO: 2x16 unsupported */
548 if(info->portwidth==4) return 1;
549
550 if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 1;
551 if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
552 for (sect = s_first; sect<=s_last; sect++) {
553 int sector_size=info->size/info->sector_count;
554 addr = (char *)(info->start[sect]);
555 memset((void *)addr, 0, sector_size);
556 }
557 return 0;
558 }
559
560 if ((s_first < 0) || (s_first > s_last)) {
561 if (info->flash_id == FLASH_UNKNOWN) {
562 printf ("- missing\n");
563 } else {
564 printf ("- no sectors to erase\n");
565 }
566 return 1;
567 }
568
569 if ((info->flash_id&FLASH_VENDMASK) == FLASH_MAN_INTEL) {
570 return flash_erase_intel(info,
571 (unsigned short)s_first,
572 (unsigned short)s_last);
573 }
574
575#if 0
576 if ((info->flash_id == FLASH_UNKNOWN) ||
577 (info->flash_id > FLASH_AMD_COMP)) {
578 printf ("Can't erase unknown flash type %08lx - aborted\n",
579 info->flash_id);
580 return 1;
581 }
582#endif
583
584 prot = 0;
585 for (sect=s_first; sect<=s_last; ++sect) {
586 if (info->protect[sect]) {
587 prot++;
588 }
589 }
590
591 if (prot) {
592 printf ("- Warning: %d protected sectors will not be erased!\n",
593 prot);
594 } else {
595 printf ("\n");
596 }
597
598 l_sect = -1;
599
600 /* Disable interrupts which might cause a timeout here */
601 flag = disable_interrupts();
602
603 flash_cmd(info->portwidth,addr,0x555,0xAA);
604 flash_cmd(info->portwidth,addr,0x2AA,0x55);
605 flash_cmd(info->portwidth,addr,0x555,0x80);
606 flash_cmd(info->portwidth,addr,0x555,0xAA);
607 flash_cmd(info->portwidth,addr,0x2AA,0x55);
608
609 /* Start erase on unprotected sectors */
610 for (sect = s_first; sect<=s_last; sect++) {
611 if (info->protect[sect] == 0) { /* not protected */
612 addr = (char *)(info->start[sect]);
613 flash_cmd(info->portwidth,addr,0,0x30);
614 l_sect = sect;
615 }
616 }
617
618 /* re-enable interrupts if necessary */
619 if (flag)
620 enable_interrupts();
621
622 /* wait at least 80us - let's wait 1 ms */
623 udelay (1000);
624
625 /*
626 * We wait for the last triggered sector
627 */
628 if (l_sect < 0)
629 goto DONE;
630
631 start = get_timer (0);
632 last = start;
633 addr = (volatile unsigned char *)(info->start[l_sect]);
634 /* broken for 2x16: TODO */
635 while ((addr[0] & 0x80) != 0x80) {
636 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
637 printf ("Timeout\n");
638 return 1;
639 }
640 /* show that we're waiting */
641 if ((now - last) > 1000) { /* every second */
642 putc ('.');
643 last = now;
644 }
645 }
646
647DONE:
648 /* reset to read mode */
649 addr = (volatile unsigned char *)info->start[0];
650 flash_cmd(info->portwidth,addr,0,0xf0);
651 flash_cmd(info->portwidth,addr,0,0xf0);
652
653 printf (" done\n");
654 return 0;
655}
656
657/*-----------------------------------------------------------------------
658 * Copy memory to flash, returns:
659 * 0 - OK
660 * 1 - write timeout
661 * 2 - Flash not erased
662 */
663
664/* broken for 2x16: TODO */
665int
666write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
667{
668 ulong cp, wp, data;
669 int i, l, rc;
670
671 if(info->portwidth==4) return 1;
672
673 if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 0;
674 if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
675 memcpy((void *)addr, src, cnt);
676 return 0;
677 }
678
679 wp = (addr & ~3); /* get lower word aligned address */
680
681 /*
682 * handle unaligned start bytes
683 */
684 if ((l = addr - wp) != 0) {
685 data = 0;
686 for (i=0, cp=wp; i<l; ++i, ++cp) {
687 data = (data << 8) | (*(uchar *)cp);
688 }
689 for (; i<4 && cnt>0; ++i) {
690 data = (data << 8) | *src++;
691 --cnt;
692 ++cp;
693 }
694 for (; cnt==0 && i<4; ++i, ++cp) {
695 data = (data << 8) | (*(uchar *)cp);
696 }
697
698 if ((rc = write_word(info, wp, data)) != 0) {
699 return (rc);
700 }
701 wp += 4;
702 }
703
704 /*
705 * handle word aligned part
706 */
707 while (cnt >= 4) {
708 data = 0;
709 for (i=0; i<4; ++i) {
710 data = (data << 8) | *src++;
711 }
712 if ((rc = write_word(info, wp, data)) != 0) {
713 return (rc);
714 }
715 wp += 4;
716 cnt -= 4;
717 }
718
719 if (cnt == 0) {
720 return (0);
721 }
722
723 /*
724 * handle unaligned tail bytes
725 */
726 data = 0;
727 for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
728 data = (data << 8) | *src++;
729 --cnt;
730 }
731 for (; i<4; ++i, ++cp) {
732 data = (data << 8) | (*(uchar *)cp);
733 }
734
735 return (write_word(info, wp, data));
736}
737
738/*-----------------------------------------------------------------------
739 * Write a word to Flash, returns:
740 * 0 - OK
741 * 1 - write timeout
742 * 2 - Flash not erased
743 */
744/* broken for 2x16: TODO */
745static int
746write_word (flash_info_t *info, ulong dest, ulong data)
747{
748 volatile unsigned char *addr = (char *)(info->start[0]);
749 ulong start;
750 int flag, i;
751
752 if(info->portwidth==4) return 1;
753
754 if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 1;
755 if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
756 *(unsigned long *)dest=data;
757 return 0;
758 }
759 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
760 unsigned short low = data & 0xffff;
761 unsigned short hi = (data >> 16) & 0xffff;
762 int ret = write_word_intel((bank_addr_t)dest, hi);
763
764 if (!ret) ret = write_word_intel((bank_addr_t)(dest+2), low);
765
766 return ret;
767 }
768
769 /* Check if Flash is (sufficiently) erased */
770 if ((*((vu_long *)dest) & data) != data) {
771 return (2);
772 }
773 /* Disable interrupts which might cause a timeout here */
774 flag = disable_interrupts();
775
776 /* first, perform an unlock bypass command to speed up flash writes */
777 addr[0x555] = 0xAA;
778 addr[0x2AA] = 0x55;
779 addr[0x555] = 0x20;
780
781 /* write each byte out */
782 for (i = 0; i < 4; i++) {
783 char *data_ch = (char *)&data;
784 addr[0] = 0xA0;
785 *(((char *)dest)+i) = data_ch[i];
786 udelay(10); /* XXX */
787 }
788
789 /* we're done, now do an unlock bypass reset */
790 addr[0] = 0x90;
791 addr[0] = 0x00;
792
793 /* re-enable interrupts if necessary */
794 if (flag)
795 enable_interrupts();
796
797 /* data polling for D7 */
798 start = get_timer (0);
799 while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
800 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
801 return (1);
802 }
803 }
804 return (0);
805}