Merge with /home/wd/git/u-boot/master
[oweals/u-boot.git] / board / esd / cpci440 / strataflash.c
1 /*
2  * (C) Copyright 2002
3  * Brad Kemp, Seranoa Networks, Brad.Kemp@seranoa.com
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 <asm/processor.h>
26
27 #undef  DEBUG_FLASH
28 /*
29  * This file implements a Common Flash Interface (CFI) driver for U-Boot.
30  * The width of the port and the width of the chips are determined at initialization.
31  * These widths are used to calculate the address for access CFI data structures.
32  * It has been tested on an Intel Strataflash implementation.
33  *
34  * References
35  * JEDEC Standard JESD68 - Common Flash Interface (CFI)
36  * JEDEC Standard JEP137-A Common Flash Interface (CFI) ID Codes
37  * Intel Application Note 646 Common Flash Interface (CFI) and Command Sets
38  * Intel 290667-008 3 Volt Intel StrataFlash Memory datasheet
39  *
40  * TODO
41  * Use Primary Extended Query table (PRI) and Alternate Algorithm Query Table (ALT) to determine if protection is available
42  * Add support for other command sets Use the PRI and ALT to determine command set
43  * Verify erase and program timeouts.
44  */
45
46 #define FLASH_CMD_CFI                   0x98
47 #define FLASH_CMD_READ_ID               0x90
48 #define FLASH_CMD_RESET                 0xff
49 #define FLASH_CMD_BLOCK_ERASE           0x20
50 #define FLASH_CMD_ERASE_CONFIRM         0xD0
51 #define FLASH_CMD_WRITE                 0x40
52 #define FLASH_CMD_PROTECT               0x60
53 #define FLASH_CMD_PROTECT_SET           0x01
54 #define FLASH_CMD_PROTECT_CLEAR         0xD0
55 #define FLASH_CMD_CLEAR_STATUS          0x50
56 #define FLASH_CMD_WRITE_TO_BUFFER       0xE8
57 #define FLASH_CMD_WRITE_BUFFER_CONFIRM  0xD0
58
59 #define FLASH_STATUS_DONE               0x80
60 #define FLASH_STATUS_ESS                0x40
61 #define FLASH_STATUS_ECLBS              0x20
62 #define FLASH_STATUS_PSLBS              0x10
63 #define FLASH_STATUS_VPENS              0x08
64 #define FLASH_STATUS_PSS                0x04
65 #define FLASH_STATUS_DPS                0x02
66 #define FLASH_STATUS_R                  0x01
67 #define FLASH_STATUS_PROTECT            0x01
68
69 #define FLASH_OFFSET_CFI                0x55
70 #define FLASH_OFFSET_CFI_RESP           0x10
71 #define FLASH_OFFSET_WTOUT              0x1F
72 #define FLASH_OFFSET_WBTOUT             0x20
73 #define FLASH_OFFSET_ETOUT              0x21
74 #define FLASH_OFFSET_CETOUT             0x22
75 #define FLASH_OFFSET_WMAX_TOUT          0x23
76 #define FLASH_OFFSET_WBMAX_TOUT         0x24
77 #define FLASH_OFFSET_EMAX_TOUT          0x25
78 #define FLASH_OFFSET_CEMAX_TOUT         0x26
79 #define FLASH_OFFSET_SIZE               0x27
80 #define FLASH_OFFSET_INTERFACE          0x28
81 #define FLASH_OFFSET_BUFFER_SIZE        0x2A
82 #define FLASH_OFFSET_NUM_ERASE_REGIONS  0x2C
83 #define FLASH_OFFSET_ERASE_REGIONS      0x2D
84 #define FLASH_OFFSET_PROTECT            0x02
85 #define FLASH_OFFSET_USER_PROTECTION    0x85
86 #define FLASH_OFFSET_INTEL_PROTECTION   0x81
87
88
89 #define FLASH_MAN_CFI                   0x01000000
90
91
92 typedef union {
93         unsigned char c;
94         unsigned short w;
95         unsigned long l;
96 } cfiword_t;
97
98 typedef union {
99         unsigned char * cp;
100         unsigned short *wp;
101         unsigned long *lp;
102 } cfiptr_t;
103
104 #define NUM_ERASE_REGIONS 4
105
106 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
107
108
109 /*-----------------------------------------------------------------------
110  * Functions
111  */
112
113
114 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c);
115 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf);
116 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd);
117 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd);
118 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd);
119 static int flash_detect_cfi(flash_info_t * info);
120 static ulong flash_get_size (ulong base, int banknum);
121 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword);
122 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt);
123 #ifdef CFG_FLASH_USE_BUFFER_WRITE
124 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len);
125 #endif
126 /*-----------------------------------------------------------------------
127  * create an address based on the offset and the port width
128  */
129 inline uchar * flash_make_addr(flash_info_t * info, int sect, int offset)
130 {
131         return ((uchar *)(info->start[sect] + (offset * info->portwidth)));
132 }
133 /*-----------------------------------------------------------------------
134  * read a character at a port width address
135  */
136 inline uchar flash_read_uchar(flash_info_t * info, uchar offset)
137 {
138         uchar *cp;
139         cp = flash_make_addr(info, 0, offset);
140         return (cp[info->portwidth - 1]);
141 }
142
143 /*-----------------------------------------------------------------------
144  * read a short word by swapping for ppc format.
145  */
146 ushort flash_read_ushort(flash_info_t * info, int sect,  uchar offset)
147 {
148     uchar * addr;
149
150     addr = flash_make_addr(info, sect, offset);
151     return ((addr[(2*info->portwidth) - 1] << 8) | addr[info->portwidth - 1]);
152
153 }
154
155 /*-----------------------------------------------------------------------
156  * read a long word by picking the least significant byte of each maiximum
157  * port size word. Swap for ppc format.
158  */
159 ulong flash_read_long(flash_info_t * info, int sect,  uchar offset)
160 {
161     uchar * addr;
162
163     addr = flash_make_addr(info, sect, offset);
164     return ( (addr[(2*info->portwidth) - 1] << 24 ) | (addr[(info->portwidth) -1] << 16) |
165             (addr[(4*info->portwidth) - 1] << 8) | addr[(3*info->portwidth) - 1]);
166
167 }
168
169 /*-----------------------------------------------------------------------
170  */
171 unsigned long flash_init (void)
172 {
173         unsigned long size;
174         int i;
175         unsigned long  address;
176
177
178         /* The flash is positioned back to back, with the demultiplexing of the chip
179          * based on the A24 address line.
180          *
181          */
182
183         address = CFG_FLASH_BASE;
184         size = 0;
185
186         /* Init: no FLASHes known */
187         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
188                 flash_info[i].flash_id = FLASH_UNKNOWN;
189                 size += flash_info[i].size = flash_get_size(address, i);
190                 address += CFG_FLASH_INCREMENT;
191                 if (flash_info[0].flash_id == FLASH_UNKNOWN) {
192                         printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",i,
193                                 flash_info[0].size, flash_info[i].size<<20);
194                 }
195         }
196
197 #if 0 /* test-only */
198         /* Monitor protection ON by default */
199 #if (CFG_MONITOR_BASE >= CFG_FLASH_BASE)
200         for(i=0; flash_info[0].start[i] < CFG_MONITOR_BASE+monitor_flash_len-1; i++)
201                 (void)flash_real_protect(&flash_info[0], i, 1);
202 #endif
203 #endif
204
205         return (size);
206 }
207
208 /*-----------------------------------------------------------------------
209  */
210 int flash_erase (flash_info_t *info, int s_first, int s_last)
211 {
212         int rcode = 0;
213         int prot;
214         int sect;
215
216         if( info->flash_id != FLASH_MAN_CFI) {
217                 printf ("Can't erase unknown flash type - aborted\n");
218                 return 1;
219         }
220         if ((s_first < 0) || (s_first > s_last)) {
221                 printf ("- no sectors to erase\n");
222                 return 1;
223         }
224
225         prot = 0;
226         for (sect=s_first; sect<=s_last; ++sect) {
227                 if (info->protect[sect]) {
228                         prot++;
229                 }
230         }
231         if (prot) {
232                 printf ("- Warning: %d protected sectors will not be erased!\n",
233                         prot);
234         } else {
235                 printf ("\n");
236         }
237
238
239         for (sect = s_first; sect<=s_last; sect++) {
240                 if (info->protect[sect] == 0) { /* not protected */
241                         flash_write_cmd(info, sect, 0, FLASH_CMD_CLEAR_STATUS);
242                         flash_write_cmd(info, sect, 0, FLASH_CMD_BLOCK_ERASE);
243                         flash_write_cmd(info, sect, 0, FLASH_CMD_ERASE_CONFIRM);
244
245                         if(flash_full_status_check(info, sect, info->erase_blk_tout, "erase")) {
246                                 rcode = 1;
247                         } else
248                                 printf(".");
249                 }
250         }
251         printf (" done\n");
252         return rcode;
253 }
254
255 /*-----------------------------------------------------------------------
256  */
257 void flash_print_info  (flash_info_t *info)
258 {
259         int i;
260
261         if (info->flash_id != FLASH_MAN_CFI) {
262                 printf ("missing or unknown FLASH type\n");
263                 return;
264         }
265
266         printf("CFI conformant FLASH (%d x %d)",
267                (info->portwidth  << 3 ), (info->chipwidth  << 3 ));
268         printf ("  Size: %ld MB in %d Sectors\n",
269                 info->size >> 20, info->sector_count);
270         printf(" Erase timeout %ld ms, write timeout %ld ms, buffer write timeout %ld ms, buffer size %d\n",
271                info->erase_blk_tout, info->write_tout, info->buffer_write_tout, info->buffer_size);
272
273         printf ("  Sector Start Addresses:");
274         for (i=0; i<info->sector_count; ++i) {
275                 if ((i % 5) == 0)
276                         printf ("\n");
277                 printf (" %08lX%5s",
278                         info->start[i],
279                         info->protect[i] ? " (RO)" : " "
280                         );
281         }
282         printf ("\n");
283         return;
284 }
285
286 /*-----------------------------------------------------------------------
287  * Copy memory to flash, returns:
288  * 0 - OK
289  * 1 - write timeout
290  * 2 - Flash not erased
291  */
292 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
293 {
294         ulong wp;
295         ulong cp;
296         int aln;
297         cfiword_t cword;
298         int i, rc;
299
300         /* get lower aligned address */
301         wp = (addr & ~(info->portwidth - 1));
302
303         /* handle unaligned start */
304         if((aln = addr - wp) != 0) {
305                 cword.l = 0;
306                 cp = wp;
307                 for(i=0;i<aln; ++i, ++cp)
308                         flash_add_byte(info, &cword, (*(uchar *)cp));
309
310                 for(; (i< info->portwidth) && (cnt > 0) ; i++) {
311                         flash_add_byte(info, &cword, *src++);
312                         cnt--;
313                         cp++;
314                 }
315                 for(; (cnt == 0) && (i < info->portwidth); ++i, ++cp)
316                         flash_add_byte(info, &cword, (*(uchar *)cp));
317                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
318                         return rc;
319                 wp = cp;
320         }
321
322 #ifdef CFG_FLASH_USE_BUFFER_WRITE
323         while(cnt >= info->portwidth) {
324                 i = info->buffer_size > cnt? cnt: info->buffer_size;
325                 if((rc = flash_write_cfibuffer(info, wp, src,i)) != ERR_OK)
326                         return rc;
327                 wp += i;
328                 src += i;
329                 cnt -=i;
330         }
331 #else
332         /* handle the aligned part */
333         while(cnt >= info->portwidth) {
334                 cword.l = 0;
335                 for(i = 0; i < info->portwidth; i++) {
336                         flash_add_byte(info, &cword, *src++);
337                 }
338                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
339                         return rc;
340                 wp += info->portwidth;
341                 cnt -= info->portwidth;
342         }
343 #endif /* CFG_FLASH_USE_BUFFER_WRITE */
344         if (cnt == 0) {
345                 return (0);
346         }
347
348         /*
349          * handle unaligned tail bytes
350          */
351         cword.l = 0;
352         for (i=0, cp=wp; (i<info->portwidth) && (cnt>0); ++i, ++cp) {
353                 flash_add_byte(info, &cword, *src++);
354                 --cnt;
355         }
356         for (; i<info->portwidth; ++i, ++cp) {
357                 flash_add_byte(info, & cword, (*(uchar *)cp));
358         }
359
360         return flash_write_cfiword(info, wp, cword);
361 }
362
363 /*-----------------------------------------------------------------------
364  */
365 int flash_real_protect(flash_info_t *info, long sector, int prot)
366 {
367         int retcode = 0;
368
369         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
370         flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT);
371         if(prot)
372                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_SET);
373         else
374                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_CLEAR);
375
376         if((retcode = flash_full_status_check(info, sector, info->erase_blk_tout,
377                                          prot?"protect":"unprotect")) == 0) {
378
379                 info->protect[sector] = prot;
380                 /* Intel's unprotect unprotects all locking */
381                 if(prot == 0) {
382                         int i;
383                         for(i = 0 ; i<info->sector_count; i++) {
384                                 if(info->protect[i])
385                                         flash_real_protect(info, i, 1);
386                         }
387                 }
388         }
389
390         return retcode;
391 }
392 /*-----------------------------------------------------------------------
393  *  wait for XSR.7 to be set. Time out with an error if it does not.
394  *  This routine does not set the flash to read-array mode.
395  */
396 static int flash_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
397 {
398         ulong start;
399
400         /* Wait for command completion */
401         start = get_timer (0);
402         while(!flash_isset(info, sector, 0, FLASH_STATUS_DONE)) {
403                 if (get_timer(start) > info->erase_blk_tout) {
404                         printf("Flash %s timeout at address %lx\n", prompt, info->start[sector]);
405                         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
406                         return ERR_TIMOUT;
407                 }
408         }
409         return ERR_OK;
410 }
411 /*-----------------------------------------------------------------------
412  * Wait for XSR.7 to be set, if it times out print an error, otherwise do a full status check.
413  * This routine sets the flash to read-array mode.
414  */
415 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
416 {
417         int retcode;
418         retcode = flash_status_check(info, sector, tout, prompt);
419         if((retcode == ERR_OK) && !flash_isequal(info,sector, 0, FLASH_STATUS_DONE)) {
420                 retcode = ERR_INVAL;
421                 printf("Flash %s error at address %lx\n", prompt,info->start[sector]);
422                 if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS | FLASH_STATUS_PSLBS)){
423                         printf("Command Sequence Error.\n");
424                 } else if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS)){
425                         printf("Block Erase Error.\n");
426                         retcode = ERR_NOT_ERASED;
427                 } else if (flash_isset(info, sector, 0, FLASH_STATUS_PSLBS)) {
428                         printf("Locking Error\n");
429                 }
430                 if(flash_isset(info, sector, 0, FLASH_STATUS_DPS)){
431                         printf("Block locked.\n");
432                         retcode = ERR_PROTECTED;
433                 }
434                 if(flash_isset(info, sector, 0, FLASH_STATUS_VPENS))
435                         printf("Vpp Low Error.\n");
436         }
437         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
438         return retcode;
439 }
440 /*-----------------------------------------------------------------------
441  */
442 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c)
443 {
444         switch(info->portwidth) {
445         case FLASH_CFI_8BIT:
446                 cword->c = c;
447                 break;
448         case FLASH_CFI_16BIT:
449                 cword->w = (cword->w << 8) | c;
450                 break;
451         case FLASH_CFI_32BIT:
452                 cword->l = (cword->l << 8) | c;
453         }
454 }
455
456
457 /*-----------------------------------------------------------------------
458  * make a proper sized command based on the port and chip widths
459  */
460 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf)
461 {
462         int i;
463         uchar *cp = (uchar *)cmdbuf;
464         for(i=0; i< info->portwidth; i++)
465                 *cp++ = ((i+1) % info->chipwidth) ? '\0':cmd;
466 }
467
468 /*
469  * Write a proper sized command to the correct address
470  */
471 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd)
472 {
473
474         volatile cfiptr_t addr;
475         cfiword_t cword;
476         addr.cp = flash_make_addr(info, sect, offset);
477         flash_make_cmd(info, cmd, &cword);
478         switch(info->portwidth) {
479         case FLASH_CFI_8BIT:
480                 *addr.cp = cword.c;
481                 break;
482         case FLASH_CFI_16BIT:
483                 *addr.wp = cword.w;
484                 break;
485         case FLASH_CFI_32BIT:
486                 *addr.lp = cword.l;
487                 break;
488         }
489 }
490
491 /*-----------------------------------------------------------------------
492  */
493 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd)
494 {
495         cfiptr_t cptr;
496         cfiword_t cword;
497         int retval;
498         cptr.cp = flash_make_addr(info, sect, offset);
499         flash_make_cmd(info, cmd, &cword);
500         switch(info->portwidth) {
501         case FLASH_CFI_8BIT:
502                 retval = (cptr.cp[0] == cword.c);
503                 break;
504         case FLASH_CFI_16BIT:
505                 retval = (cptr.wp[0] == cword.w);
506                 break;
507         case FLASH_CFI_32BIT:
508                 retval = (cptr.lp[0] == cword.l);
509                 break;
510         default:
511                 retval = 0;
512                 break;
513         }
514         return retval;
515 }
516 /*-----------------------------------------------------------------------
517  */
518 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd)
519 {
520         cfiptr_t cptr;
521         cfiword_t cword;
522         int retval;
523         cptr.cp = flash_make_addr(info, sect, offset);
524         flash_make_cmd(info, cmd, &cword);
525         switch(info->portwidth) {
526         case FLASH_CFI_8BIT:
527                 retval = ((cptr.cp[0] & cword.c) == cword.c);
528                 break;
529         case FLASH_CFI_16BIT:
530                 retval = ((cptr.wp[0] & cword.w) == cword.w);
531                 break;
532         case FLASH_CFI_32BIT:
533                 retval = ((cptr.lp[0] & cword.l) == cword.l);
534                 break;
535         default:
536                 retval = 0;
537                 break;
538         }
539         return retval;
540 }
541
542 /*-----------------------------------------------------------------------
543  * detect if flash is compatible with the Common Flash Interface (CFI)
544  * http://www.jedec.org/download/search/jesd68.pdf
545  *
546  */
547 static int flash_detect_cfi(flash_info_t * info)
548 {
549
550         for(info->portwidth=FLASH_CFI_8BIT; info->portwidth <= FLASH_CFI_32BIT;
551             info->portwidth <<= 1) {
552                 for(info->chipwidth =FLASH_CFI_BY8;
553                     info->chipwidth <= info->portwidth;
554                     info->chipwidth <<= 1) {
555                         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
556                         flash_write_cmd(info, 0, FLASH_OFFSET_CFI, FLASH_CMD_CFI);
557                         if(flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP,'Q') &&
558                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R') &&
559                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y'))
560                                 return 1;
561                 }
562         }
563         return 0;
564 }
565 /*
566  * The following code cannot be run from FLASH!
567  *
568  */
569 static ulong flash_get_size (ulong base, int banknum)
570 {
571         flash_info_t * info = &flash_info[banknum];
572         int i, j;
573         int sect_cnt;
574         unsigned long sector;
575         unsigned long tmp;
576         int size_ratio;
577         uchar num_erase_regions;
578         int  erase_region_size;
579         int  erase_region_count;
580
581         info->start[0] = base;
582
583         if(flash_detect_cfi(info)){
584 #ifdef DEBUG_FLASH
585                 printf("portwidth=%d chipwidth=%d\n", info->portwidth, info->chipwidth); /* test-only */
586 #endif
587                 size_ratio = info->portwidth / info->chipwidth;
588                 num_erase_regions = flash_read_uchar(info, FLASH_OFFSET_NUM_ERASE_REGIONS);
589 #ifdef DEBUG_FLASH
590                 printf("found %d erase regions\n", num_erase_regions);
591 #endif
592                 sect_cnt = 0;
593                 sector = base;
594                 for(i = 0 ; i < num_erase_regions; i++) {
595                         if(i > NUM_ERASE_REGIONS) {
596                                 printf("%d erase regions found, only %d used\n",
597                                        num_erase_regions, NUM_ERASE_REGIONS);
598                                 break;
599                         }
600                         tmp = flash_read_long(info, 0, FLASH_OFFSET_ERASE_REGIONS);
601                         erase_region_size = (tmp & 0xffff)? ((tmp & 0xffff) * 256): 128;
602                         tmp >>= 16;
603                         erase_region_count = (tmp & 0xffff) +1;
604                         for(j = 0; j< erase_region_count; j++) {
605                                 info->start[sect_cnt] = sector;
606                                 sector += (erase_region_size * size_ratio);
607                                 info->protect[sect_cnt] = flash_isset(info, sect_cnt, FLASH_OFFSET_PROTECT, FLASH_STATUS_PROTECT);
608                                 sect_cnt++;
609                         }
610                 }
611
612                 info->sector_count = sect_cnt;
613                 /* multiply the size by the number of chips */
614                 info->size = (1 << flash_read_uchar(info, FLASH_OFFSET_SIZE)) * size_ratio;
615                 info->buffer_size = (1 << flash_read_ushort(info, 0, FLASH_OFFSET_BUFFER_SIZE));
616                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_ETOUT);
617                 info->erase_blk_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_EMAX_TOUT)));
618                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WBTOUT);
619                 info->buffer_write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WBMAX_TOUT)));
620                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WTOUT);
621                 info->write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WMAX_TOUT)))/ 1000;
622                 info->flash_id = FLASH_MAN_CFI;
623         }
624
625         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
626         return(info->size);
627 }
628
629
630 /*-----------------------------------------------------------------------
631  */
632 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword)
633 {
634
635         cfiptr_t ctladdr;
636         cfiptr_t cptr;
637         int flag;
638
639         ctladdr.cp = flash_make_addr(info, 0, 0);
640         cptr.cp = (uchar *)dest;
641
642
643         /* Check if Flash is (sufficiently) erased */
644         switch(info->portwidth) {
645         case FLASH_CFI_8BIT:
646                 flag = ((cptr.cp[0] & cword.c) == cword.c);
647                 break;
648         case FLASH_CFI_16BIT:
649                 flag = ((cptr.wp[0] & cword.w) == cword.w);
650                 break;
651         case FLASH_CFI_32BIT:
652                 flag = ((cptr.lp[0] & cword.l)  == cword.l);
653                 break;
654         default:
655                 return 2;
656         }
657         if(!flag)
658                 return 2;
659
660         /* Disable interrupts which might cause a timeout here */
661         flag = disable_interrupts();
662
663         flash_write_cmd(info, 0, 0, FLASH_CMD_CLEAR_STATUS);
664         flash_write_cmd(info, 0, 0, FLASH_CMD_WRITE);
665
666         switch(info->portwidth) {
667         case FLASH_CFI_8BIT:
668                 cptr.cp[0] = cword.c;
669                 break;
670         case FLASH_CFI_16BIT:
671                 cptr.wp[0] = cword.w;
672                 break;
673         case FLASH_CFI_32BIT:
674                 cptr.lp[0] = cword.l;
675                 break;
676         }
677
678         /* re-enable interrupts if necessary */
679         if(flag)
680                 enable_interrupts();
681
682         return flash_full_status_check(info, 0, info->write_tout, "write");
683 }
684
685 #ifdef CFG_FLASH_USE_BUFFER_WRITE
686
687 /* loop through the sectors from the highest address
688  * when the passed address is greater or equal to the sector address
689  * we have a match
690  */
691 static int find_sector(flash_info_t *info, ulong addr)
692 {
693         int sector;
694         for(sector = info->sector_count - 1; sector >= 0; sector--) {
695                 if(addr >= info->start[sector])
696                         break;
697         }
698         return sector;
699 }
700
701 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len)
702 {
703
704         int sector;
705         int cnt;
706         int retcode;
707         volatile cfiptr_t src;
708         volatile cfiptr_t dst;
709
710         src.cp = cp;
711         dst.cp = (uchar *)dest;
712         sector = find_sector(info, dest);
713         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
714         flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_TO_BUFFER);
715         if((retcode = flash_status_check(info, sector, info->buffer_write_tout,
716                                          "write to buffer")) == ERR_OK) {
717                 switch(info->portwidth) {
718                 case FLASH_CFI_8BIT:
719                         cnt = len;
720                         break;
721                 case FLASH_CFI_16BIT:
722                         cnt = len >> 1;
723                         break;
724                 case FLASH_CFI_32BIT:
725                         cnt = len >> 2;
726                         break;
727                 default:
728                         return ERR_INVAL;
729                         break;
730                 }
731                 flash_write_cmd(info, sector, 0, (uchar)cnt-1);
732                 while(cnt-- > 0) {
733                         switch(info->portwidth) {
734                         case FLASH_CFI_8BIT:
735                                 *dst.cp++ = *src.cp++;
736                                 break;
737                         case FLASH_CFI_16BIT:
738                                 *dst.wp++ = *src.wp++;
739                                 break;
740                         case FLASH_CFI_32BIT:
741                                 *dst.lp++ = *src.lp++;
742                                 break;
743                         default:
744                                 return ERR_INVAL;
745                                 break;
746                         }
747                 }
748                 flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_BUFFER_CONFIRM);
749                 retcode = flash_full_status_check(info, sector, info->buffer_write_tout,
750                                              "buffer write");
751         }
752         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
753         return retcode;
754 }
755 #endif /* CFG_USE_FLASH_BUFFER_WRITE */