Statistics
| Branch: | Revision:

root / hw / pflash_cfi01.c @ 99a0949b

History | View | Annotate | Download (17.5 kB)

1
/*
2
 *  CFI parallel flash with Intel command set emulation
3
 *
4
 *  Copyright (c) 2006 Thorsten Zitterell
5
 *  Copyright (c) 2005 Jocelyn Mayer
6
 *
7
 * This library is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2 of the License, or (at your option) any later version.
11
 *
12
 * This library is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19
 */
20

    
21
/*
22
 * For now, this code can emulate flashes of 1, 2 or 4 bytes width.
23
 * Supported commands/modes are:
24
 * - flash read
25
 * - flash write
26
 * - flash ID read
27
 * - sector erase
28
 * - CFI queries
29
 *
30
 * It does not support timings
31
 * It does not support flash interleaving
32
 * It does not implement software data protection as found in many real chips
33
 * It does not implement erase suspend/resume commands
34
 * It does not implement multiple sectors erase
35
 *
36
 * It does not implement much more ...
37
 */
38

    
39
#include "hw.h"
40
#include "flash.h"
41
#include "block.h"
42
#include "qemu-timer.h"
43

    
44
#define PFLASH_BUG(fmt, ...) \
45
do { \
46
    printf("PFLASH: Possible BUG - " fmt, ## __VA_ARGS__); \
47
    exit(1); \
48
} while(0)
49

    
50
/* #define PFLASH_DEBUG */
51
#ifdef PFLASH_DEBUG
52
#define DPRINTF(fmt, ...)                          \
53
do {                                               \
54
    printf("PFLASH: " fmt , ## __VA_ARGS__);       \
55
} while (0)
56
#else
57
#define DPRINTF(fmt, ...) do { } while (0)
58
#endif
59

    
60
struct pflash {
61
    BlockDriverState *bs;
62
    a_target_phys_addr base;
63
    a_target_phys_addr sector_len;
64
    a_target_phys_addr total_len;
65
    int width;
66
    int wcycle; /* if 0, the flash is read normally */
67
    int bypass;
68
    int ro;
69
    uint8_t cmd;
70
    uint8_t status;
71
    uint16_t ident[4];
72
    uint8_t cfi_len;
73
    uint8_t cfi_table[0x52];
74
    a_target_phys_addr counter;
75
    QEMUTimer *timer;
76
    a_ram_addr off;
77
    int fl_mem;
78
    void *storage;
79
};
80

    
81
static void pflash_timer (void *opaque)
82
{
83
    a_pflash *pfl = opaque;
84

    
85
    DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
86
    /* Reset flash */
87
    pfl->status ^= 0x80;
88
    if (pfl->bypass) {
89
        pfl->wcycle = 2;
90
    } else {
91
        cpu_register_physical_memory(pfl->base, pfl->total_len,
92
                        pfl->off | IO_MEM_ROMD | pfl->fl_mem);
93
        pfl->wcycle = 0;
94
    }
95
    pfl->cmd = 0;
96
}
97

    
98
static uint32_t pflash_read (a_pflash *pfl, a_target_phys_addr offset,
99
                             int width)
100
{
101
    a_target_phys_addr boff;
102
    uint32_t ret;
103
    uint8_t *p;
104

    
105
    ret = -1;
106
    boff = offset & 0xFF; /* why this here ?? */
107

    
108
    if (pfl->width == 2)
109
        boff = boff >> 1;
110
    else if (pfl->width == 4)
111
        boff = boff >> 2;
112

    
113
#if 0
114
    DPRINTF("%s: reading offset " TARGET_FMT_plx " under cmd %02x width %d\n",
115
            __func__, offset, pfl->cmd, width);
116
#endif
117
    switch (pfl->cmd) {
118
    case 0x00:
119
        /* Flash area read */
120
        p = pfl->storage;
121
        switch (width) {
122
        case 1:
123
            ret = p[offset];
124
            DPRINTF("%s: data offset " TARGET_FMT_plx " %02x\n",
125
                    __func__, offset, ret);
126
            break;
127
        case 2:
128
#if defined(TARGET_WORDS_BIGENDIAN)
129
            ret = p[offset] << 8;
130
            ret |= p[offset + 1];
131
#else
132
            ret = p[offset];
133
            ret |= p[offset + 1] << 8;
134
#endif
135
            DPRINTF("%s: data offset " TARGET_FMT_plx " %04x\n",
136
                    __func__, offset, ret);
137
            break;
138
        case 4:
139
#if defined(TARGET_WORDS_BIGENDIAN)
140
            ret = p[offset] << 24;
141
            ret |= p[offset + 1] << 16;
142
            ret |= p[offset + 2] << 8;
143
            ret |= p[offset + 3];
144
#else
145
            ret = p[offset];
146
            ret |= p[offset + 1] << 8;
147
            ret |= p[offset + 1] << 8;
148
            ret |= p[offset + 2] << 16;
149
            ret |= p[offset + 3] << 24;
150
#endif
151
            DPRINTF("%s: data offset " TARGET_FMT_plx " %08x\n",
152
                    __func__, offset, ret);
153
            break;
154
        default:
155
            DPRINTF("BUG in %s\n", __func__);
156
        }
157

    
158
        break;
159
    case 0x20: /* Block erase */
160
    case 0x50: /* Clear status register */
161
    case 0x60: /* Block /un)lock */
162
    case 0x70: /* Status Register */
163
    case 0xe8: /* Write block */
164
        /* Status register read */
165
        ret = pfl->status;
166
        DPRINTF("%s: status %x\n", __func__, ret);
167
        break;
168
    case 0x98: /* Query mode */
169
        if (boff > pfl->cfi_len)
170
            ret = 0;
171
        else
172
            ret = pfl->cfi_table[boff];
173
        break;
174
    default:
175
        /* This should never happen : reset state & treat it as a read */
176
        DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
177
        pfl->wcycle = 0;
178
        pfl->cmd = 0;
179
    }
180
    return ret;
181
}
182

    
183
/* update flash content on disk */
184
static void pflash_update(a_pflash *pfl, int offset,
185
                          int size)
186
{
187
    int offset_end;
188
    if (pfl->bs) {
189
        offset_end = offset + size;
190
        /* round to sectors */
191
        offset = offset >> 9;
192
        offset_end = (offset_end + 511) >> 9;
193
        bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
194
                   offset_end - offset);
195
    }
196
}
197

    
198
static inline void pflash_data_write(a_pflash *pfl, a_target_phys_addr offset,
199
                          uint32_t value, int width)
200
{
201
    uint8_t *p = pfl->storage;
202

    
203
    DPRINTF("%s: block write offset " TARGET_FMT_plx
204
            " value %x counter " TARGET_FMT_plx "\n",
205
            __func__, offset, value, pfl->counter);
206
    switch (width) {
207
    case 1:
208
        p[offset] = value;
209
        pflash_update(pfl, offset, 1);
210
        break;
211
    case 2:
212
#if defined(TARGET_WORDS_BIGENDIAN)
213
        p[offset] = value >> 8;
214
        p[offset + 1] = value;
215
#else
216
        p[offset] = value;
217
        p[offset + 1] = value >> 8;
218
#endif
219
        pflash_update(pfl, offset, 2);
220
        break;
221
    case 4:
222
#if defined(TARGET_WORDS_BIGENDIAN)
223
        p[offset] = value >> 24;
224
        p[offset + 1] = value >> 16;
225
        p[offset + 2] = value >> 8;
226
        p[offset + 3] = value;
227
#else
228
        p[offset] = value;
229
        p[offset + 1] = value >> 8;
230
        p[offset + 2] = value >> 16;
231
        p[offset + 3] = value >> 24;
232
#endif
233
        pflash_update(pfl, offset, 4);
234
        break;
235
    }
236

    
237
}
238

    
239
static void pflash_write(a_pflash *pfl, a_target_phys_addr offset,
240
                         uint32_t value, int width)
241
{
242
    a_target_phys_addr boff;
243
    uint8_t *p;
244
    uint8_t cmd;
245

    
246
    cmd = value;
247

    
248
    DPRINTF("%s: writing offset " TARGET_FMT_plx " value %08x width %d wcycle 0x%x\n",
249
            __func__, offset, value, width, pfl->wcycle);
250

    
251
    /* Set the device in I/O access mode */
252
    cpu_register_physical_memory(pfl->base, pfl->total_len, pfl->fl_mem);
253
    boff = offset & (pfl->sector_len - 1);
254

    
255
    if (pfl->width == 2)
256
        boff = boff >> 1;
257
    else if (pfl->width == 4)
258
        boff = boff >> 2;
259

    
260
    switch (pfl->wcycle) {
261
    case 0:
262
        /* read mode */
263
        switch (cmd) {
264
        case 0x00: /* ??? */
265
            goto reset_flash;
266
        case 0x10: /* Single Byte Program */
267
        case 0x40: /* Single Byte Program */
268
            DPRINTF("%s: Single Byte Program\n", __func__);
269
            break;
270
        case 0x20: /* Block erase */
271
            p = pfl->storage;
272
            offset &= ~(pfl->sector_len - 1);
273

    
274
            DPRINTF("%s: block erase at " TARGET_FMT_plx " bytes "
275
                    TARGET_FMT_plx "\n",
276
                    __func__, offset, pfl->sector_len);
277

    
278
            memset(p + offset, 0xff, pfl->sector_len);
279
            pflash_update(pfl, offset, pfl->sector_len);
280
            pfl->status |= 0x80; /* Ready! */
281
            break;
282
        case 0x50: /* Clear status bits */
283
            DPRINTF("%s: Clear status bits\n", __func__);
284
            pfl->status = 0x0;
285
            goto reset_flash;
286
        case 0x60: /* Block (un)lock */
287
            DPRINTF("%s: Block unlock\n", __func__);
288
            break;
289
        case 0x70: /* Status Register */
290
            DPRINTF("%s: Read status register\n", __func__);
291
            pfl->cmd = cmd;
292
            return;
293
        case 0x98: /* CFI query */
294
            DPRINTF("%s: CFI query\n", __func__);
295
            break;
296
        case 0xe8: /* Write to buffer */
297
            DPRINTF("%s: Write to buffer\n", __func__);
298
            pfl->status |= 0x80; /* Ready! */
299
            break;
300
        case 0xff: /* Read array mode */
301
            DPRINTF("%s: Read array mode\n", __func__);
302
            goto reset_flash;
303
        default:
304
            goto error_flash;
305
        }
306
        pfl->wcycle++;
307
        pfl->cmd = cmd;
308
        return;
309
    case 1:
310
        switch (pfl->cmd) {
311
        case 0x10: /* Single Byte Program */
312
        case 0x40: /* Single Byte Program */
313
            DPRINTF("%s: Single Byte Program\n", __func__);
314
            pflash_data_write(pfl, offset, value, width);
315
            pfl->status |= 0x80; /* Ready! */
316
            pfl->wcycle = 0;
317
        break;
318
        case 0x20: /* Block erase */
319
        case 0x28:
320
            if (cmd == 0xd0) { /* confirm */
321
                pfl->wcycle = 0;
322
                pfl->status |= 0x80;
323
            } else if (cmd == 0xff) { /* read array mode */
324
                goto reset_flash;
325
            } else
326
                goto error_flash;
327

    
328
            break;
329
        case 0xe8:
330
            DPRINTF("%s: block write of %x bytes\n", __func__, value);
331
            pfl->counter = value;
332
            pfl->wcycle++;
333
            break;
334
        case 0x60:
335
            if (cmd == 0xd0) {
336
                pfl->wcycle = 0;
337
                pfl->status |= 0x80;
338
            } else if (cmd == 0x01) {
339
                pfl->wcycle = 0;
340
                pfl->status |= 0x80;
341
            } else if (cmd == 0xff) {
342
                goto reset_flash;
343
            } else {
344
                DPRINTF("%s: Unknown (un)locking command\n", __func__);
345
                goto reset_flash;
346
            }
347
            break;
348
        case 0x98:
349
            if (cmd == 0xff) {
350
                goto reset_flash;
351
            } else {
352
                DPRINTF("%s: leaving query mode\n", __func__);
353
            }
354
            break;
355
        default:
356
            goto error_flash;
357
        }
358
        return;
359
    case 2:
360
        switch (pfl->cmd) {
361
        case 0xe8: /* Block write */
362
            pflash_data_write(pfl, offset, value, width);
363

    
364
            pfl->status |= 0x80;
365

    
366
            if (!pfl->counter) {
367
                DPRINTF("%s: block write finished\n", __func__);
368
                pfl->wcycle++;
369
            }
370

    
371
            pfl->counter--;
372
            break;
373
        default:
374
            goto error_flash;
375
        }
376
        return;
377
    case 3: /* Confirm mode */
378
        switch (pfl->cmd) {
379
        case 0xe8: /* Block write */
380
            if (cmd == 0xd0) {
381
                pfl->wcycle = 0;
382
                pfl->status |= 0x80;
383
            } else {
384
                DPRINTF("%s: unknown command for \"write block\"\n", __func__);
385
                PFLASH_BUG("Write block confirm");
386
                goto reset_flash;
387
            }
388
            break;
389
        default:
390
            goto error_flash;
391
        }
392
        return;
393
    default:
394
        /* Should never happen */
395
        DPRINTF("%s: invalid write state\n",  __func__);
396
        goto reset_flash;
397
    }
398
    return;
399

    
400
 error_flash:
401
    printf("%s: Unimplemented flash cmd sequence "
402
           "(offset " TARGET_FMT_plx ", wcycle 0x%x cmd 0x%x value 0x%x)\n",
403
           __func__, offset, pfl->wcycle, pfl->cmd, value);
404

    
405
 reset_flash:
406
    cpu_register_physical_memory(pfl->base, pfl->total_len,
407
                    pfl->off | IO_MEM_ROMD | pfl->fl_mem);
408

    
409
    pfl->bypass = 0;
410
    pfl->wcycle = 0;
411
    pfl->cmd = 0;
412
    return;
413
}
414

    
415

    
416
static uint32_t pflash_readb (void *opaque, a_target_phys_addr addr)
417
{
418
    return pflash_read(opaque, addr, 1);
419
}
420

    
421
static uint32_t pflash_readw (void *opaque, a_target_phys_addr addr)
422
{
423
    a_pflash *pfl = opaque;
424

    
425
    return pflash_read(pfl, addr, 2);
426
}
427

    
428
static uint32_t pflash_readl (void *opaque, a_target_phys_addr addr)
429
{
430
    a_pflash *pfl = opaque;
431

    
432
    return pflash_read(pfl, addr, 4);
433
}
434

    
435
static void pflash_writeb (void *opaque, a_target_phys_addr addr,
436
                           uint32_t value)
437
{
438
    pflash_write(opaque, addr, value, 1);
439
}
440

    
441
static void pflash_writew (void *opaque, a_target_phys_addr addr,
442
                           uint32_t value)
443
{
444
    a_pflash *pfl = opaque;
445

    
446
    pflash_write(pfl, addr, value, 2);
447
}
448

    
449
static void pflash_writel (void *opaque, a_target_phys_addr addr,
450
                           uint32_t value)
451
{
452
    a_pflash *pfl = opaque;
453

    
454
    pflash_write(pfl, addr, value, 4);
455
}
456

    
457
static CPUWriteMemoryFunc * const pflash_write_ops[] = {
458
    &pflash_writeb,
459
    &pflash_writew,
460
    &pflash_writel,
461
};
462

    
463
static CPUReadMemoryFunc * const pflash_read_ops[] = {
464
    &pflash_readb,
465
    &pflash_readw,
466
    &pflash_readl,
467
};
468

    
469
/* Count trailing zeroes of a 32 bits quantity */
470
static int ctz32 (uint32_t n)
471
{
472
    int ret;
473

    
474
    ret = 0;
475
    if (!(n & 0xFFFF)) {
476
        ret += 16;
477
        n = n >> 16;
478
    }
479
    if (!(n & 0xFF)) {
480
        ret += 8;
481
        n = n >> 8;
482
    }
483
    if (!(n & 0xF)) {
484
        ret += 4;
485
        n = n >> 4;
486
    }
487
    if (!(n & 0x3)) {
488
        ret += 2;
489
        n = n >> 2;
490
    }
491
    if (!(n & 0x1)) {
492
        ret++;
493
        n = n >> 1;
494
    }
495
#if 0 /* This is not necessary as n is never 0 */
496
    if (!n)
497
        ret++;
498
#endif
499

    
500
    return ret;
501
}
502

    
503
a_pflash *pflash_cfi01_register(a_target_phys_addr base, a_ram_addr off,
504
                                BlockDriverState *bs, uint32_t sector_len,
505
                                int nb_blocs, int width,
506
                                uint16_t id0, uint16_t id1,
507
                                uint16_t id2, uint16_t id3)
508
{
509
    a_pflash *pfl;
510
    a_target_phys_addr total_len;
511
    int ret;
512

    
513
    total_len = sector_len * nb_blocs;
514

    
515
    /* XXX: to be fixed */
516
#if 0
517
    if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
518
        total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
519
        return NULL;
520
#endif
521

    
522
    pfl = qemu_mallocz(sizeof(a_pflash));
523

    
524
    /* FIXME: Allocate ram ourselves.  */
525
    pfl->storage = qemu_get_ram_ptr(off);
526
    pfl->fl_mem = cpu_register_io_memory(
527
                    pflash_read_ops, pflash_write_ops, pfl);
528
    pfl->off = off;
529
    cpu_register_physical_memory(base, total_len,
530
                    off | pfl->fl_mem | IO_MEM_ROMD);
531

    
532
    pfl->bs = bs;
533
    if (pfl->bs) {
534
        /* read the initial flash content */
535
        ret = bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
536
        if (ret < 0) {
537
            cpu_unregister_io_memory(pfl->fl_mem);
538
            qemu_free(pfl);
539
            return NULL;
540
        }
541
    }
542
#if 0 /* XXX: there should be a bit to set up read-only,
543
       *      the same way the hardware does (with WP pin).
544
       */
545
    pfl->ro = 1;
546
#else
547
    pfl->ro = 0;
548
#endif
549
    pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
550
    pfl->base = base;
551
    pfl->sector_len = sector_len;
552
    pfl->total_len = total_len;
553
    pfl->width = width;
554
    pfl->wcycle = 0;
555
    pfl->cmd = 0;
556
    pfl->status = 0;
557
    pfl->ident[0] = id0;
558
    pfl->ident[1] = id1;
559
    pfl->ident[2] = id2;
560
    pfl->ident[3] = id3;
561
    /* Hardcoded CFI table */
562
    pfl->cfi_len = 0x52;
563
    /* Standard "QRY" string */
564
    pfl->cfi_table[0x10] = 'Q';
565
    pfl->cfi_table[0x11] = 'R';
566
    pfl->cfi_table[0x12] = 'Y';
567
    /* Command set (Intel) */
568
    pfl->cfi_table[0x13] = 0x01;
569
    pfl->cfi_table[0x14] = 0x00;
570
    /* Primary extended table address (none) */
571
    pfl->cfi_table[0x15] = 0x31;
572
    pfl->cfi_table[0x16] = 0x00;
573
    /* Alternate command set (none) */
574
    pfl->cfi_table[0x17] = 0x00;
575
    pfl->cfi_table[0x18] = 0x00;
576
    /* Alternate extended table (none) */
577
    pfl->cfi_table[0x19] = 0x00;
578
    pfl->cfi_table[0x1A] = 0x00;
579
    /* Vcc min */
580
    pfl->cfi_table[0x1B] = 0x45;
581
    /* Vcc max */
582
    pfl->cfi_table[0x1C] = 0x55;
583
    /* Vpp min (no Vpp pin) */
584
    pfl->cfi_table[0x1D] = 0x00;
585
    /* Vpp max (no Vpp pin) */
586
    pfl->cfi_table[0x1E] = 0x00;
587
    /* Reserved */
588
    pfl->cfi_table[0x1F] = 0x07;
589
    /* Timeout for min size buffer write */
590
    pfl->cfi_table[0x20] = 0x07;
591
    /* Typical timeout for block erase */
592
    pfl->cfi_table[0x21] = 0x0a;
593
    /* Typical timeout for full chip erase (4096 ms) */
594
    pfl->cfi_table[0x22] = 0x00;
595
    /* Reserved */
596
    pfl->cfi_table[0x23] = 0x04;
597
    /* Max timeout for buffer write */
598
    pfl->cfi_table[0x24] = 0x04;
599
    /* Max timeout for block erase */
600
    pfl->cfi_table[0x25] = 0x04;
601
    /* Max timeout for chip erase */
602
    pfl->cfi_table[0x26] = 0x00;
603
    /* Device size */
604
    pfl->cfi_table[0x27] = ctz32(total_len); // + 1;
605
    /* Flash device interface (8 & 16 bits) */
606
    pfl->cfi_table[0x28] = 0x02;
607
    pfl->cfi_table[0x29] = 0x00;
608
    /* Max number of bytes in multi-bytes write */
609
    pfl->cfi_table[0x2A] = 0x0B;
610
    pfl->cfi_table[0x2B] = 0x00;
611
    /* Number of erase block regions (uniform) */
612
    pfl->cfi_table[0x2C] = 0x01;
613
    /* Erase block region 1 */
614
    pfl->cfi_table[0x2D] = nb_blocs - 1;
615
    pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
616
    pfl->cfi_table[0x2F] = sector_len >> 8;
617
    pfl->cfi_table[0x30] = sector_len >> 16;
618

    
619
    /* Extended */
620
    pfl->cfi_table[0x31] = 'P';
621
    pfl->cfi_table[0x32] = 'R';
622
    pfl->cfi_table[0x33] = 'I';
623

    
624
    pfl->cfi_table[0x34] = '1';
625
    pfl->cfi_table[0x35] = '1';
626

    
627
    pfl->cfi_table[0x36] = 0x00;
628
    pfl->cfi_table[0x37] = 0x00;
629
    pfl->cfi_table[0x38] = 0x00;
630
    pfl->cfi_table[0x39] = 0x00;
631

    
632
    pfl->cfi_table[0x3a] = 0x00;
633

    
634
    pfl->cfi_table[0x3b] = 0x00;
635
    pfl->cfi_table[0x3c] = 0x00;
636

    
637
    return pfl;
638
}