]> git.sur5r.net Git - u-boot/blob - board/cray/L1/flash.c
Merge branch 'master' of /home/wd/git/u-boot/custodians
[u-boot] / board / cray / L1 / 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 /*
25  * Modified 4/5/2001
26  * Wait for completion of each sector erase command issued
27  * 4/5/2001
28  * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
29  */
30
31 /*
32  * Modified July 20, 2001
33  * Strip down to support ONLY the AMD29F032B.
34  * Dave Updegraff - Cray, Inc. dave@cray.com
35  */
36
37 #include <common.h>
38 #include <asm/ppc4xx.h>
39 #include <asm/processor.h>
40
41 /* The flash chip we use... */
42 #define AMD_ID_F032B    0x41    /* 29F032B ID  32 Mbit,64 64Kx8 sectors */
43 #define FLASH_AM320B    0x0009
44
45
46 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
47
48 /*-----------------------------------------------------------------------
49  * Functions
50  */
51 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
52 static int write_word (flash_info_t *info, ulong dest, ulong data);
53 static void flash_get_offsets (ulong base, flash_info_t *info);
54
55 #define ADDR0           0x5555
56 #define ADDR1           0x2aaa
57 #define FLASH_WORD_SIZE unsigned char
58
59 /*-----------------------------------------------------------------------
60  */
61
62 unsigned long flash_init (void)
63 {
64         unsigned long size_b0, size_b1;
65         int i;
66
67         /* Init: no FLASHes known */
68         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
69                 flash_info[i].flash_id = FLASH_UNKNOWN;
70         }
71
72         /* Static FLASH Bank configuration here - FIXME XXX */
73
74         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
75
76         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
77                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
78                         size_b0, size_b0<<20);
79         }
80
81         /* Only one bank */
82         if (CONFIG_SYS_MAX_FLASH_BANKS == 1)
83           {
84             /* Setup offsets */
85             flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
86
87 #if 0
88             /* Monitor protection ON by default */
89             (void)flash_protect(FLAG_PROTECT_SET,
90                                 FLASH_BASE0_PRELIM,
91                                 FLASH_BASE0_PRELIM+monitor_flash_len-1,
92                                 &flash_info[0]);
93 #endif
94             size_b1 = 0 ;
95             flash_info[0].size = size_b0;
96           }
97
98         return (size_b0 + size_b1);
99 }
100
101
102 /*-----------------------------------------------------------------------
103  */
104 static void flash_get_offsets (ulong base, flash_info_t *info)
105 {
106         int i;
107
108         /* set up sector start address table */
109         for (i = 0; i < info->sector_count; i++)
110                 info->start[i] = base + (i * 0x00010000);
111 }
112
113 /*-----------------------------------------------------------------------
114  */
115 void flash_print_info  (flash_info_t *info)
116 {
117         int i;
118         int k;
119         int size;
120         int erased;
121         volatile unsigned long *flash;
122
123         if (info->flash_id == FLASH_UNKNOWN) {
124                 printf ("missing or unknown FLASH type\n");
125                 return;
126         }
127
128         switch (info->flash_id & FLASH_VENDMASK) {
129         case FLASH_MAN_AMD:     printf ("AMD ");                break;
130         default:                printf ("Unknown Vendor ");     break;
131         }
132
133         switch (info->flash_id & FLASH_TYPEMASK) {
134         case FLASH_AM320B:printf ("AM29F032B (32 Mbit 64x64KB uniform sectors)\n");
135                                 break;
136         default:                printf ("Unknown Chip Type\n");
137                                 break;
138         }
139
140         printf ("  Size: %ld KB in %d Sectors\n",
141                 info->size >> 10, info->sector_count);
142
143         printf ("  Sector Start Addresses:");
144         for (i=0; i<info->sector_count; ++i) {
145                 /*
146                  * Check if whole sector is erased
147                  */
148                 if (i != (info->sector_count-1))
149                   size = info->start[i+1] - info->start[i];
150                 else
151                   size = info->start[0] + info->size - info->start[i];
152                 erased = 1;
153                 flash = (volatile unsigned long *)info->start[i];
154                 size = size >> 2;        /* divide by 4 for longword access */
155                 for (k=0; k<size; k++)
156                   {
157                     if (*flash++ != 0xffffffff)
158                       {
159                         erased = 0;
160                         break;
161                       }
162                   }
163
164                 if ((i % 5) == 0)
165                         printf ("\n   ");
166
167                 printf (" %08lX%s%s",
168                         info->start[i],
169                         erased ? " E" : "  ",
170                         info->protect[i] ? "RO " : "   "
171                 );
172         }
173         printf ("\n");
174 }
175
176 /*-----------------------------------------------------------------------
177  */
178
179
180 /*-----------------------------------------------------------------------
181  */
182
183 /*
184  * The following code cannot be run from FLASH!
185  */
186 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
187 {
188         short i;
189         FLASH_WORD_SIZE value;
190         ulong base = (ulong)addr;
191         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
192
193         /* Write auto select command: read Manufacturer ID */
194         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
195         addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
196         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
197
198         value = addr2[0];
199
200         switch (value) {
201         case (FLASH_WORD_SIZE)AMD_MANUFACT:
202                 info->flash_id = FLASH_MAN_AMD;
203                 break;
204         default:
205                 info->flash_id = FLASH_UNKNOWN;
206                 info->sector_count = 0;
207                 info->size = 0;
208                 return (0);                     /* no or unknown flash  */
209         }
210
211         value = addr2[1];                       /* device ID            */
212
213         switch (value) {
214         case (FLASH_WORD_SIZE)AMD_ID_F032B:
215                 info->flash_id += FLASH_AM320B;
216                 info->sector_count = 64;
217                 info->size = 0x0400000; /* => 4 MB */
218                 break;
219         default:
220                 info->flash_id = FLASH_UNKNOWN;
221                 return (0);                     /* => no or unknown flash */
222
223         }
224
225         /* set up sector start address table */
226         for (i = 0; i < info->sector_count; i++)
227                 info->start[i] = base + (i * 0x00010000);
228
229         /* check for protected sectors */
230         for (i = 0; i < info->sector_count; i++) {
231                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
232                 /* D0 = 1 if protected */
233                 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
234         info->protect[i] = addr2[2] & 1;
235         }
236
237         /*
238          * Prevent writes to uninitialized FLASH.
239          */
240         if (info->flash_id != FLASH_UNKNOWN) {
241                 addr2 = (FLASH_WORD_SIZE *)info->start[0];
242                 *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
243         }
244
245         return (info->size);
246 }
247
248 int wait_for_DQ7(flash_info_t *info, int sect)
249 {
250         ulong start, now, last;
251         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);
252
253         start = get_timer (0);
254     last  = start;
255     while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
256         if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
257             printf ("Timeout\n");
258             return -1;
259         }
260         /* show that we're waiting */
261         if ((now - last) > 1000) {  /* every second */
262             putc ('.');
263             last = now;
264         }
265     }
266         return 0;
267 }
268
269 /*-----------------------------------------------------------------------
270  */
271
272 int     flash_erase (flash_info_t *info, int s_first, int s_last)
273 {
274         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
275         volatile FLASH_WORD_SIZE *addr2;
276         int flag, prot, sect, l_sect;
277
278         if ((s_first < 0) || (s_first > s_last)) {
279                 if (info->flash_id == FLASH_UNKNOWN) {
280                         printf ("- missing\n");
281                 } else {
282                         printf ("- no sectors to erase\n");
283                 }
284                 return 1;
285         }
286
287         if (info->flash_id == FLASH_UNKNOWN) {
288                 printf ("Can't erase unknown flash type - aborted\n");
289                 return 1;
290         }
291
292         prot = 0;
293         for (sect=s_first; sect<=s_last; ++sect) {
294                 if (info->protect[sect]) {
295                         prot++;
296                 }
297         }
298
299         if (prot) {
300                 printf ("- Warning: %d protected sectors will not be erased!\n",
301                         prot);
302         } else {
303                 printf ("\n");
304         }
305
306         l_sect = -1;
307
308         /* Disable interrupts which might cause a timeout here */
309         flag = disable_interrupts();
310
311         /* Start erase on unprotected sectors */
312         for (sect = s_first; sect<=s_last; sect++) {
313                 if (info->protect[sect] == 0) { /* not protected */
314                     addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
315                     printf("Erasing sector %p\n", addr2);
316
317                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
318                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
319                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
320                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
321                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
322                         addr2[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
323                     l_sect = sect;
324                     /*
325                      * Wait for each sector to complete, it's more
326                      * reliable.  According to AMD Spec, you must
327                      * issue all erase commands within a specified
328                      * timeout.  This has been seen to fail, especially
329                      * if printf()s are included (for debug)!!
330                      */
331                     wait_for_DQ7(info, sect);
332                 }
333         }
334
335         /* re-enable interrupts if necessary */
336         if (flag)
337                 enable_interrupts();
338
339         /* wait at least 80us - let's wait 1 ms */
340         udelay (1000);
341
342         /* reset to read mode */
343         addr = (FLASH_WORD_SIZE *)info->start[0];
344         addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* reset bank */
345
346         printf (" done\n");
347         return 0;
348 }
349
350 /*-----------------------------------------------------------------------
351  * Copy memory to flash, returns:
352  * 0 - OK
353  * 1 - write timeout
354  * 2 - Flash not erased
355  */
356
357 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
358 {
359         ulong cp, wp, data;
360         int i, l, rc;
361
362         wp = (addr & ~3);       /* get lower word aligned address */
363
364         /*
365          * handle unaligned start bytes
366          */
367         if ((l = addr - wp) != 0) {
368                 data = 0;
369                 for (i=0, cp=wp; i<l; ++i, ++cp) {
370                         data = (data << 8) | (*(uchar *)cp);
371                 }
372                 for (; i<4 && cnt>0; ++i) {
373                         data = (data << 8) | *src++;
374                         --cnt;
375                         ++cp;
376                 }
377                 for (; cnt==0 && i<4; ++i, ++cp) {
378                         data = (data << 8) | (*(uchar *)cp);
379                 }
380
381                 if ((rc = write_word(info, wp, data)) != 0) {
382                         return (rc);
383                 }
384                 wp += 4;
385         }
386
387         /*
388          * handle word aligned part
389          */
390         while (cnt >= 4) {
391                 data = 0;
392                 for (i=0; i<4; ++i) {
393                         data = (data << 8) | *src++;
394                 }
395                 if ((rc = write_word(info, wp, data)) != 0) {
396                         return (rc);
397                 }
398                 wp  += 4;
399                 cnt -= 4;
400         }
401
402         if (cnt == 0) {
403                 return (0);
404         }
405
406         /*
407          * handle unaligned tail bytes
408          */
409         data = 0;
410         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
411                 data = (data << 8) | *src++;
412                 --cnt;
413         }
414         for (; i<4; ++i, ++cp) {
415                 data = (data << 8) | (*(uchar *)cp);
416         }
417
418         return (write_word(info, wp, data));
419 }
420
421 /*-----------------------------------------------------------------------
422  * Write a word to Flash, returns:
423  * 0 - OK
424  * 1 - write timeout
425  * 2 - Flash not erased
426  */
427 static int write_word (flash_info_t *info, ulong dest, ulong data)
428 {
429         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)(info->start[0]);
430         volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *)dest;
431         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
432         ulong start;
433         int flag;
434         int i;
435
436         /* Check if Flash is (sufficiently) erased */
437         if ((*((volatile FLASH_WORD_SIZE *)dest) &
438              (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
439                 return (2);
440         }
441         /* Disable interrupts which might cause a timeout here */
442         flag = disable_interrupts();
443
444         for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
445           {
446             addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
447             addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
448             addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;
449
450             dest2[i] = data2[i];
451
452             /* re-enable interrupts if necessary */
453             if (flag)
454               enable_interrupts();
455
456             /* data polling for D7 */
457             start = get_timer (0);
458             while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=
459                    (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
460               if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
461                 return (1);
462               }
463             }
464           }
465
466         return (0);
467 }
468
469 /*-----------------------------------------------------------------------
470  */