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[u-boot] / board / smdk2410 / flash.c
1 /*
2  * (C) Copyright 2002
3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4  * Alex Zuepke <azu@sysgo.de>
5  *
6  * See file CREDITS for list of people who contributed to this
7  * project.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of
12  * the License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22  * MA 02111-1307 USA
23  */
24
25 #include <common.h>
26
27 ulong myflush (void);
28
29
30 #define FLASH_BANK_SIZE PHYS_FLASH_SIZE
31 #define MAIN_SECT_SIZE  0x10000 /* 64 KB */
32
33 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
34
35
36 #define CMD_READ_ARRAY          0x000000F0
37 #define CMD_UNLOCK1             0x000000AA
38 #define CMD_UNLOCK2             0x00000055
39 #define CMD_ERASE_SETUP         0x00000080
40 #define CMD_ERASE_CONFIRM       0x00000030
41 #define CMD_PROGRAM             0x000000A0
42 #define CMD_UNLOCK_BYPASS       0x00000020
43
44 #define MEM_FLASH_ADDR1         (*(volatile u16 *)(CFG_FLASH_BASE + (0x00000555 << 1)))
45 #define MEM_FLASH_ADDR2         (*(volatile u16 *)(CFG_FLASH_BASE + (0x000002AA << 1)))
46
47 #define BIT_ERASE_DONE          0x00000080
48 #define BIT_RDY_MASK            0x00000080
49 #define BIT_PROGRAM_ERROR       0x00000020
50 #define BIT_TIMEOUT             0x80000000      /* our flag */
51
52 #define READY 1
53 #define ERR   2
54 #define TMO   4
55
56 /*-----------------------------------------------------------------------
57  */
58
59 ulong flash_init (void)
60 {
61         int i, j;
62         ulong size = 0;
63
64         for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
65                 ulong flashbase = 0;
66
67                 flash_info[i].flash_id =
68 #if defined(CONFIG_AMD_LV400)
69                         (AMD_MANUFACT & FLASH_VENDMASK) |
70                         (AMD_ID_LV400B & FLASH_TYPEMASK);
71 #elif defined(CONFIG_AMD_LV800)
72                         (AMD_MANUFACT & FLASH_VENDMASK) |
73                         (AMD_ID_LV800B & FLASH_TYPEMASK);
74 #else
75 #error "Unknown flash configured"
76 #endif
77                         flash_info[i].size = FLASH_BANK_SIZE;
78                 flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
79                 memset (flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
80                 if (i == 0)
81                         flashbase = PHYS_FLASH_1;
82                 else
83                         panic ("configured too many flash banks!\n");
84                 for (j = 0; j < flash_info[i].sector_count; j++) {
85                         if (j <= 3) {
86                                 /* 1st one is 16 KB */
87                                 if (j == 0) {
88                                         flash_info[i].start[j] =
89                                                 flashbase + 0;
90                                 }
91
92                                 /* 2nd and 3rd are both 8 KB */
93                                 if ((j == 1) || (j == 2)) {
94                                         flash_info[i].start[j] =
95                                                 flashbase + 0x4000 + (j -
96                                                                       1) *
97                                                 0x2000;
98                                 }
99
100                                 /* 4th 32 KB */
101                                 if (j == 3) {
102                                         flash_info[i].start[j] =
103                                                 flashbase + 0x8000;
104                                 }
105                         } else {
106                                 flash_info[i].start[j] =
107                                         flashbase + (j - 3) * MAIN_SECT_SIZE;
108                         }
109                 }
110                 size += flash_info[i].size;
111         }
112
113         flash_protect (FLAG_PROTECT_SET,
114                        CFG_FLASH_BASE,
115                        CFG_FLASH_BASE + monitor_flash_len - 1,
116                        &flash_info[0]);
117
118         flash_protect (FLAG_PROTECT_SET,
119                        CFG_ENV_ADDR,
120                        CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);
121
122         return size;
123 }
124
125 /*-----------------------------------------------------------------------
126  */
127 void flash_print_info (flash_info_t * info)
128 {
129         int i;
130
131         switch (info->flash_id & FLASH_VENDMASK) {
132         case (AMD_MANUFACT & FLASH_VENDMASK):
133                 printf ("AMD: ");
134                 break;
135         default:
136                 printf ("Unknown Vendor ");
137                 break;
138         }
139
140         switch (info->flash_id & FLASH_TYPEMASK) {
141         case (AMD_ID_LV400B & FLASH_TYPEMASK):
142                 printf ("1x Amd29LV400BB (4Mbit)\n");
143                 break;
144         case (AMD_ID_LV800B & FLASH_TYPEMASK):
145                 printf ("1x Amd29LV800BB (8Mbit)\n");
146                 break;
147         default:
148                 printf ("Unknown Chip Type\n");
149                 goto Done;
150                 break;
151         }
152
153         printf ("  Size: %ld MB in %d Sectors\n",
154                 info->size >> 20, info->sector_count);
155
156         printf ("  Sector Start Addresses:");
157         for (i = 0; i < info->sector_count; i++) {
158                 if ((i % 5) == 0) {
159                         printf ("\n   ");
160                 }
161                 printf (" %08lX%s", info->start[i],
162                         info->protect[i] ? " (RO)" : "     ");
163         }
164         printf ("\n");
165
166       Done:;
167 }
168
169 /*-----------------------------------------------------------------------
170  */
171
172 int flash_erase (flash_info_t * info, int s_first, int s_last)
173 {
174         ushort result;
175         int iflag, cflag, prot, sect;
176         int rc = ERR_OK;
177         int chip;
178
179         /* first look for protection bits */
180
181         if (info->flash_id == FLASH_UNKNOWN)
182                 return ERR_UNKNOWN_FLASH_TYPE;
183
184         if ((s_first < 0) || (s_first > s_last)) {
185                 return ERR_INVAL;
186         }
187
188         if ((info->flash_id & FLASH_VENDMASK) !=
189             (AMD_MANUFACT & FLASH_VENDMASK)) {
190                 return ERR_UNKNOWN_FLASH_VENDOR;
191         }
192
193         prot = 0;
194         for (sect = s_first; sect <= s_last; ++sect) {
195                 if (info->protect[sect]) {
196                         prot++;
197                 }
198         }
199         if (prot)
200                 return ERR_PROTECTED;
201
202         /*
203          * Disable interrupts which might cause a timeout
204          * here. Remember that our exception vectors are
205          * at address 0 in the flash, and we don't want a
206          * (ticker) exception to happen while the flash
207          * chip is in programming mode.
208          */
209         cflag = icache_status ();
210         icache_disable ();
211         iflag = disable_interrupts ();
212
213         /* Start erase on unprotected sectors */
214         for (sect = s_first; sect <= s_last && !ctrlc (); sect++) {
215                 printf ("Erasing sector %2d ... ", sect);
216
217                 /* arm simple, non interrupt dependent timer */
218                 reset_timer_masked ();
219
220                 if (info->protect[sect] == 0) { /* not protected */
221                         vu_short *addr = (vu_short *) (info->start[sect]);
222
223                         MEM_FLASH_ADDR1 = CMD_UNLOCK1;
224                         MEM_FLASH_ADDR2 = CMD_UNLOCK2;
225                         MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;
226
227                         MEM_FLASH_ADDR1 = CMD_UNLOCK1;
228                         MEM_FLASH_ADDR2 = CMD_UNLOCK2;
229                         *addr = CMD_ERASE_CONFIRM;
230
231                         /* wait until flash is ready */
232                         chip = 0;
233
234                         do {
235                                 result = *addr;
236
237                                 /* check timeout */
238                                 if (get_timer_masked () >
239                                     CFG_FLASH_ERASE_TOUT) {
240                                         MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
241                                         chip = TMO;
242                                         break;
243                                 }
244
245                                 if (!chip
246                                     && (result & 0xFFFF) & BIT_ERASE_DONE)
247                                         chip = READY;
248
249                                 if (!chip
250                                     && (result & 0xFFFF) & BIT_PROGRAM_ERROR)
251                                         chip = ERR;
252
253                         } while (!chip);
254
255                         MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
256
257                         if (chip == ERR) {
258                                 rc = ERR_PROG_ERROR;
259                                 goto outahere;
260                         }
261                         if (chip == TMO) {
262                                 rc = ERR_TIMOUT;
263                                 goto outahere;
264                         }
265
266                         printf ("ok.\n");
267                 } else {        /* it was protected */
268
269                         printf ("protected!\n");
270                 }
271         }
272
273         if (ctrlc ())
274                 printf ("User Interrupt!\n");
275
276       outahere:
277         /* allow flash to settle - wait 10 ms */
278         udelay_masked (10000);
279
280         if (iflag)
281                 enable_interrupts ();
282
283         if (cflag)
284                 icache_enable ();
285
286         return rc;
287 }
288
289 /*-----------------------------------------------------------------------
290  * Copy memory to flash
291  */
292
293 volatile static int write_hword (flash_info_t * info, ulong dest, ushort data)
294 {
295         vu_short *addr = (vu_short *) dest;
296         ushort result;
297         int rc = ERR_OK;
298         int cflag, iflag;
299         int chip;
300
301         /*
302          * Check if Flash is (sufficiently) erased
303          */
304         result = *addr;
305         if ((result & data) != data)
306                 return ERR_NOT_ERASED;
307
308
309         /*
310          * Disable interrupts which might cause a timeout
311          * here. Remember that our exception vectors are
312          * at address 0 in the flash, and we don't want a
313          * (ticker) exception to happen while the flash
314          * chip is in programming mode.
315          */
316         cflag = icache_status ();
317         icache_disable ();
318         iflag = disable_interrupts ();
319
320         MEM_FLASH_ADDR1 = CMD_UNLOCK1;
321         MEM_FLASH_ADDR2 = CMD_UNLOCK2;
322         MEM_FLASH_ADDR1 = CMD_UNLOCK_BYPASS;
323         *addr = CMD_PROGRAM;
324         *addr = data;
325
326         /* arm simple, non interrupt dependent timer */
327         reset_timer_masked ();
328
329         /* wait until flash is ready */
330         chip = 0;
331         do {
332                 result = *addr;
333
334                 /* check timeout */
335                 if (get_timer_masked () > CFG_FLASH_ERASE_TOUT) {
336                         chip = ERR | TMO;
337                         break;
338                 }
339                 if (!chip && ((result & 0x80) == (data & 0x80)))
340                         chip = READY;
341
342                 if (!chip && ((result & 0xFFFF) & BIT_PROGRAM_ERROR)) {
343                         result = *addr;
344
345                         if ((result & 0x80) == (data & 0x80))
346                                 chip = READY;
347                         else
348                                 chip = ERR;
349                 }
350
351         } while (!chip);
352
353         *addr = CMD_READ_ARRAY;
354
355         if (chip == ERR || *addr != data)
356                 rc = ERR_PROG_ERROR;
357
358         if (iflag)
359                 enable_interrupts ();
360
361         if (cflag)
362                 icache_enable ();
363
364         return rc;
365 }
366
367 /*-----------------------------------------------------------------------
368  * Copy memory to flash.
369  */
370
371 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
372 {
373         ulong cp, wp;
374         int l;
375         int i, rc;
376         ushort data;
377
378         wp = (addr & ~1);       /* get lower word aligned address */
379
380         /*
381          * handle unaligned start bytes
382          */
383         if ((l = addr - wp) != 0) {
384                 data = 0;
385                 for (i = 0, cp = wp; i < l; ++i, ++cp) {
386                         data = (data >> 8) | (*(uchar *) cp << 8);
387                 }
388                 for (; i < 2 && cnt > 0; ++i) {
389                         data = (data >> 8) | (*src++ << 8);
390                         --cnt;
391                         ++cp;
392                 }
393                 for (; cnt == 0 && i < 2; ++i, ++cp) {
394                         data = (data >> 8) | (*(uchar *) cp << 8);
395                 }
396
397                 if ((rc = write_hword (info, wp, data)) != 0) {
398                         return (rc);
399                 }
400                 wp += 2;
401         }
402
403         /*
404          * handle word aligned part
405          */
406         while (cnt >= 2) {
407                 data = *((vu_short *) src);
408                 if ((rc = write_hword (info, wp, data)) != 0) {
409                         return (rc);
410                 }
411                 src += 2;
412                 wp += 2;
413                 cnt -= 2;
414         }
415
416         if (cnt == 0) {
417                 return ERR_OK;
418         }
419
420         /*
421          * handle unaligned tail bytes
422          */
423         data = 0;
424         for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
425                 data = (data >> 8) | (*src++ << 8);
426                 --cnt;
427         }
428         for (; i < 2; ++i, ++cp) {
429                 data = (data >> 8) | (*(uchar *) cp << 8);
430         }
431
432         return write_hword (info, wp, data);
433 }