summaryrefslogtreecommitdiffstats
path: root/board/gw8260/flash.c
blob: 6cf311f2e0f66c024f517f3abe250d057b29f54c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
/*
 * (C) Copyright 2000
 * Marius Groeger <mgroeger@sysgo.de>
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 *
 * (C) Copyright 2000, 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2001
 * Advent Networks, Inc. <http://www.adventnetworks.com>
 * Oliver Brown <oliverb@alumni.utexas.net>
 *
 *--------------------------------------------------------------------
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*********************************************************************/
/* DESCRIPTION:
 *   This file contains the flash routines for the GW8260 board.
 *
 *
 *
 * MODULE DEPENDENCY:
 *   None
 *
 *
 * RESTRICTIONS/LIMITATIONS:
 *
 *   Only supports the following flash devices:
 *     AMD 29F080B
 *     AMD 29F016D
 *
 * Copyright (c) 2001, Advent Networks, Inc.
 *
 */
/*********************************************************************/

#include <common.h>
#include <mpc8260.h>

flash_info_t flash_info[CFG_MAX_FLASH_BANKS];

static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);

/*********************************************************************/
/*		      functions					     */
/*********************************************************************/

/*********************************************************************/
/* NAME: flash_init() -	 initializes flash banks		     */
/*								     */
/* DESCRIPTION:							     */
/*   This function initializes the flash bank(s).		     */
/*								     */
/* RETURNS:							     */
/*   The size in bytes of the flash				     */
/*								     */
/* RESTRICTIONS/LIMITATIONS:					     */
/*								     */
/*								     */
/*********************************************************************/
unsigned long flash_init (void)
{
    unsigned long size;
    int i;

    /* Init: no FLASHes known */
    for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
	flash_info[i].flash_id = FLASH_UNKNOWN;
    }

    /* for now, only support the 4 MB Flash SIMM */
    size = flash_get_size((vu_long *)CFG_FLASH0_BASE, &flash_info[0]);

    /*
     * protect monitor and environment sectors
     */

#if CFG_MONITOR_BASE >= CFG_FLASH0_BASE
    flash_protect(FLAG_PROTECT_SET,
		  CFG_MONITOR_BASE,
		  CFG_MONITOR_BASE+monitor_flash_len-1,
		  &flash_info[0]);
#endif

#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
# ifndef  CONFIG_ENV_SIZE
#  define CONFIG_ENV_SIZE	CONFIG_ENV_SECT_SIZE
# endif
    flash_protect(FLAG_PROTECT_SET,
		  CONFIG_ENV_ADDR,
		  CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
		  &flash_info[0]);
#endif

    return (CFG_FLASH0_SIZE * 1024 * 1024);  /*size*/
}

/*********************************************************************/
/* NAME: flash_print_info() - prints flash imformation		     */
/*								     */
/* DESCRIPTION:							     */
/*   This function prints the flash information.		     */
/*								     */
/* INPUTS:							     */
/*   flash_info_t *info - flash information structure		     */
/*								     */
/* OUTPUTS:							     */
/*   Displays flash information to console			     */
/*								     */
/* RETURNS:							     */
/*   None							     */
/*								     */
/* RESTRICTIONS/LIMITATIONS:					     */
/*								     */
/*								     */
/*********************************************************************/
void flash_print_info  (flash_info_t *info)
{
    int i;

    if (info->flash_id == FLASH_UNKNOWN) {
	printf ("missing or unknown FLASH type\n");
	return;
    }

    switch ((info->flash_id >> 16) & 0xff) {
    case 0x1:
	printf ("AMD ");
	break;
    default:
	printf ("Unknown Vendor ");
	break;
    }

    switch (info->flash_id & FLASH_TYPEMASK) {
    case AMD_ID_F040B:
	printf ("AM29F040B (4 Mbit)\n");
	break;
    case AMD_ID_F080B:
	printf ("AM29F080B (8 Mbit)\n");
	break;
    case AMD_ID_F016D:
	printf ("AM29F016D (16 Mbit)\n");
	break;
    default:
	printf ("Unknown Chip Type\n");
	break;
    }

    printf ("  Size: %ld MB in %d Sectors\n",
	    info->size >> 20, info->sector_count);

    printf ("  Sector Start Addresses:");
    for (i=0; i<info->sector_count; ++i) {
	if ((i % 5) == 0)
	    printf ("\n	  ");
	printf (" %08lX%s",
		info->start[i],
		info->protect[i] ? " (RO)" : "	   "
	    );
    }
    printf ("\n");
    return;
}

/*********************************************************************/
/*   The following code cannot be run from FLASH!		     */
/*********************************************************************/

/*********************************************************************/
/* NAME: flash_get_size() - detects the flash size		     */
/*								     */
/* DESCRIPTION:							     */
/*   1) Reads vendor ID and devices ID from the flash devices.	     */
/*   2) Initializes flash info struct.				     */
/*   3) Return the flash size					     */
/*								     */
/* INPUTS:							     */
/*   vu_long *addr	- pointer to start of flash		     */
/*   flash_info_t *info - flash information structure		     */
/*								     */
/* OUTPUTS:							     */
/*   None							     */
/*								     */
/* RETURNS:							     */
/*   Size of the flash in bytes, or 0 if device id is unknown.	     */
/*								     */
/* RESTRICTIONS/LIMITATIONS:					     */
/*   Only supports the following devices:			     */
/*     AM29F080D						     */
/*     AM29F016D						     */
/*								     */
/*********************************************************************/
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
    short i;
    vu_long vendor, devid;
    ulong base = (ulong)addr;

    /*printf("addr   = %08lx\n", (unsigned long)addr); */

    /* Reset and Write auto select command: read Manufacturer ID */
    addr[0x0000] = 0xf0f0f0f0;
    addr[0x0555] = 0xAAAAAAAA;
    addr[0x02AA] = 0x55555555;
    addr[0x0555] = 0x90909090;
    udelay (1000);

    vendor = addr[0];
    /*printf("vendor = %08lx\n", vendor); */
    if (vendor != 0x01010101) {
	info->size = 0;
	goto out;
    }

    devid = addr[1];
    /*printf("devid  = %08lx\n", devid); */

    if ((devid & 0xff) == AMD_ID_F080B) {
	info->flash_id	   = (vendor & 0xff) << 16 | AMD_ID_F080B;
	/* we have 16 sectors with 64KB each x 4 */
	info->sector_count = 16;
	info->size	   = 4 * info->sector_count * 64*1024;
    } else if ((devid & 0xff) == AMD_ID_F016D){
	info->flash_id	   = (vendor & 0xff) << 16 | AMD_ID_F016D;
	/* we have 32 sectors with 64KB each x 4 */
	info->sector_count = 32;
	info->size	   = 4 * info->sector_count * 64*1024;
    } else {
	info->size = 0;
	goto out;
    }
    /*printf("sector count = %08x\n", info->sector_count); */
    /* check for protected sectors */
    for (i = 0; i < info->sector_count; i++) {
	/* sector base address */
	info->start[i] = base + i * (info->size / info->sector_count);
	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	/* D0 = 1 if protected */
	addr = (volatile unsigned long *)(info->start[i]);
	info->protect[i] = addr[2] & 1;
    }

    /* reset command */
    addr = (vu_long *)info->start[0];

  out:
    addr[0] = 0xf0f0f0f0;

    /*printf("size = %08x\n", info->size); */
    return info->size;
}

/*********************************************************************/
/* NAME: flash_erase() - erases flash by sector			     */
/*								     */
/* DESCRIPTION:							     */
/*   This function erases flash sectors starting for s_first to	     */
/*   s_last.							     */
/*								     */
/* INPUTS:							     */
/*   flash_info_t *info - flash information structure		     */
/*   int s_first - first sector to erase			     */
/*   int s_last	 - last sector to erase				     */
/*								     */
/* OUTPUTS:							     */
/*   None							     */
/*								     */
/* RETURNS:							     */
/*   Returns 0 for success, 1 for failure.			     */
/*								     */
/* RESTRICTIONS/LIMITATIONS:					     */
/*								     */
/*********************************************************************/
int flash_erase (flash_info_t *info, int s_first, int s_last)
{
    vu_long *addr = (vu_long*)(info->start[0]);
    int flag, prot, sect, l_sect;
    ulong start, now, last;

    if ((s_first < 0) || (s_first > s_last)) {
	if (info->flash_id == FLASH_UNKNOWN) {
	    printf ("- missing\n");
	} else {
	    printf ("- no sectors to erase\n");
	}
	return 1;
    }

    prot = 0;
    for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect]) {
	    prot++;
	}
    }

    if (prot) {
	printf ("- Warning: %d protected sectors will not be erased!\n",
		prot);
    } else {
	printf ("\n");
    }

    l_sect = -1;

    /* Disable interrupts which might cause a timeout here */
    flag = disable_interrupts();

    addr[0x0555] = 0xAAAAAAAA;
    addr[0x02AA] = 0x55555555;
    addr[0x0555] = 0x80808080;
    addr[0x0555] = 0xAAAAAAAA;
    addr[0x02AA] = 0x55555555;
    udelay (100);

    /* Start erase on unprotected sectors */
    for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	    addr = (vu_long*)(info->start[sect]);
	    addr[0] = 0x30303030;
	    l_sect = sect;
	}
    }

    /* re-enable interrupts if necessary */
    if (flag)
	enable_interrupts();

    /* wait at least 80us - let's wait 1 ms */
    udelay (1000);

    /*
     * We wait for the last triggered sector
     */
    if (l_sect < 0)
	goto DONE;

    start = get_timer (0);
    last  = start;
    addr = (vu_long*)(info->start[l_sect]);
    while ((addr[0] & 0x80808080) != 0x80808080) {
	if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
	    printf ("Timeout\n");
	    return 1;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) {  /* every second */
	    serial_putc ('.');
	    last = now;
	}
    }

  DONE:
    /* reset to read mode */
    addr = (volatile unsigned long *)info->start[0];
    addr[0] = 0xF0F0F0F0;   /* reset bank */

    printf (" done\n");
    return 0;
}

/*********************************************************************/
/* NAME: write_buff() - writes a buffer to flash		     */
/*								     */
/* DESCRIPTION:							     */
/*   This function copies a buffer, *src, to flash.		     */
/*								     */
/* INPUTS:							     */
/*  flash_info_t *info - flash information structure		     */
/*  uchar *src - pointer to buffer to write to flash		     */
/*  ulong addr - address to start write at			     */
/*  ulong cnt - number of bytes to write to flash		     */
/*								     */
/* OUTPUTS:							     */
/*   None							     */
/*								     */
/* RETURNS:							     */
/*   0 - OK							     */
/*   1 - write timeout						     */
/*   2 - Flash not erased					     */
/*								     */
/* RESTRICTIONS/LIMITATIONS:					     */
/*								     */
/*********************************************************************/
int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
    ulong cp, wp, data;
    int i, l, rc;

    wp = (addr & ~3);	/* get lower word aligned address */

    /*
     * handle unaligned start bytes
     */
    if ((l = addr - wp) != 0) {
	data = 0;
	for (i = 0, cp = wp; i < l; ++i, ++cp) {
	    data = (data << 8) | (*(uchar *)cp);
	}
	for (; (i < 4) && (cnt > 0); ++i) {
	    data = (data << 8) | *src++;
	    --cnt;
	    ++cp;
	}
	for (; (cnt == 0) && (i < 4); ++i, ++cp) {
	    data = (data << 8) | (*(uchar *)cp);
	}

	if ((rc = write_word(info, wp, data)) != 0) {
	    return (rc);
	}
	wp += 4;
    }

    /*
     * handle word aligned part
     */
    while (cnt >= 4) {
	data = 0;
	for (i = 0; i < 4; ++i) {
	    data = (data << 8) | *src++;
	}
	if ((rc = write_word(info, wp, data)) != 0) {
	    return (rc);
	}
	wp  += 4;
	cnt -= 4;
    }

    if (cnt == 0) {
	return (0);
    }

    /*
     * handle unaligned tail bytes
     */
    data = 0;
    for (i = 0, cp = wp; (i < 4) && (cnt > 0); ++i, ++cp) {
	data = (data << 8) | *src++;
	--cnt;
    }
    for (; (i < 4); ++i, ++cp) {
	data = (data << 8) | (*(uchar *)cp);
    }

    return (write_word(info, wp, data));
}

/*********************************************************************/
/* NAME: write_word() - writes a word to flash			     */
/*								     */
/* DESCRIPTION:							     */
/*   This writes a single word to flash.			     */
/*								     */
/* INPUTS:							     */
/*  flash_info_t *info - flash information structure		     */
/*  ulong dest - address to write				     */
/*  ulong data - data to write					     */
/*								     */
/* OUTPUTS:							     */
/*   None							     */
/*								     */
/* RETURNS:							     */
/*   0 - OK							     */
/*   1 - write timeout						     */
/*   2 - Flash not erased					     */
/*								     */
/* RESTRICTIONS/LIMITATIONS:					     */
/*								     */
/*********************************************************************/
static int write_word (flash_info_t *info, ulong dest, ulong data)
{
    vu_long *addr = (vu_long*)(info->start[0]);
    ulong start;
    int flag;

    /* Check if Flash is (sufficiently) erased */
    if ((*((vu_long *)dest) & data) != data) {
	return (2);
    }
    /* Disable interrupts which might cause a timeout here */
    flag = disable_interrupts();

    addr[0x0555] = 0xAAAAAAAA;
    addr[0x02AA] = 0x55555555;
    addr[0x0555] = 0xA0A0A0A0;

    *((vu_long *)dest) = data;

    /* re-enable interrupts if necessary */
    if (flag)
	enable_interrupts();

    /* data polling for D7 */
    start = get_timer (0);
    while ((*((vu_long *)dest) & 0x80808080) != (data & 0x80808080)) {
	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
	    return (1);
	}
    }
    return (0);
}
/*********************************************************************/
/*			   End of flash.c			     */
/*********************************************************************/
OpenPOWER on IntegriCloud