summaryrefslogtreecommitdiffstats
path: root/apps/plugins/iriver_flash.c
blob: 40c9a2979be1cb07a8fc3f43a745cff27c95bd5b (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
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * !!! DON'T MESS WITH THIS CODE UNLESS YOU'RE ABSOLUTELY SURE WHAT YOU DO !!!
 * 
 * Copyright (C) 2006 by Miika Pekkarinen
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "plugin.h"

/* All CFI flash routines are copied and ported from firmware_flash.c */

#ifndef SIMULATOR /* only for target */

unsigned char *audiobuf;
int audiobuf_size;

#if defined(IRIVER_H120)
#define PLATFORM_ID ID_IRIVER_H100
#else
#undef PLATFORM_ID /* this platform is not (yet) flashable */
#endif

#ifdef PLATFORM_ID

PLUGIN_HEADER

#if CONFIG_KEYPAD == IRIVER_H100_PAD
#define KEY1 BUTTON_OFF
#define KEY2 BUTTON_ON
#define KEY3 BUTTON_SELECT
#define KEYNAME1 "[Stop]"
#define KEYNAME2 "[On]"
#define KEYNAME3 "[Select]"
#endif

struct flash_info
{
    uint8_t manufacturer;
    uint8_t id;
    int size;
    char name[32];
};

static struct plugin_api* rb; /* here is a global api struct pointer */

#ifdef IRIVER_H100_SERIES
#define SEC_SIZE 4096
#define BOOTLOADER_ERASEGUARD  (BOOTLOADER_ENTRYPOINT / SEC_SIZE - 1)

static volatile uint16_t* FB = (uint16_t*)0x00000000; /* Flash base address */
#endif

/* read the manufacturer and device ID */
bool cfi_read_id(volatile uint16_t* pBase, uint8_t* pManufacturerID, uint8_t* pDeviceID)
{
    uint8_t not_manu, not_id; /* read values before switching to ID mode */
    uint8_t manu, id; /* read values when in ID mode */
    
    pBase = (uint16_t*)((uint32_t)pBase & 0xFFF80000); /* down to 512k align */
    
    /* read the normal content */
    not_manu = pBase[0]; /* should be 'A' (0x41) and 'R' (0x52) */
    not_id   = pBase[1]; /*  from the "ARCH" marker */
    
    pBase[0x5555] = 0xAA; /* enter command mode */
    pBase[0x2AAA] = 0x55;
    pBase[0x5555] = 0x90; /* ID command */
    rb->sleep(HZ/50); /* Atmel wants 20ms pause here */
    
    manu = pBase[0];
    id   = pBase[1];
    
    pBase[0] = 0xF0; /* reset flash (back to normal read mode) */
    rb->sleep(HZ/50); /* Atmel wants 20ms pause here */
    
    /* I assume success if the obtained values are different from
    the normal flash content. This is not perfectly bulletproof, they 
    could theoretically be the same by chance, causing us to fail. */
    if (not_manu != manu || not_id != id) /* a value has changed */
    {
        *pManufacturerID = manu; /* return the results */
        *pDeviceID = id;
        return true; /* success */
    }
    return false; /* fail */
}


/* erase the sector which contains the given address */
bool cfi_erase_sector(volatile uint16_t* pAddr)
{
    unsigned timeout = 430000; /* the timeout loop should be no less than 25ms */
    
    FB[0x5555] = 0xAA; /* enter command mode */
    FB[0x2AAA] = 0x55;
    FB[0x5555] = 0x80; /* erase command */
    FB[0x5555] = 0xAA; /* enter command mode */
    FB[0x2AAA] = 0x55;
    *pAddr = 0x30; /* erase the sector */

    /* I counted 7 instructions for this loop -> min. 0.58 us per round */
    /* Plus memory waitstates it will be much more, gives margin */
    while (*pAddr != 0xFFFF && --timeout); /* poll for erased */

    return (timeout != 0);
}


/* address must be in an erased location */
inline bool cfi_program_word(volatile uint16_t* pAddr, uint16_t data)
{
    unsigned timeout = 85; /* the timeout loop should be no less than 20us */
    
    if (~*pAddr & data) /* just a safety feature, not really necessary */
        return false; /* can't set any bit from 0 to 1 */
    
    FB[0x5555] = 0xAA; /* enter command mode */
    FB[0x2AAA] = 0x55;
    FB[0x5555] = 0xA0; /* byte program command */
    
    *pAddr = data;
    
    /* I counted 7 instructions for this loop -> min. 0.58 us per round */
    /* Plus memory waitstates it will be much more, gives margin */
    while (*pAddr != data && --timeout); /* poll for programmed */
    
    return (timeout != 0);
}


/* this returns true if supported and fills the info struct */
bool cfi_get_flash_info(struct flash_info* pInfo)
{
    rb->memset(pInfo, 0, sizeof(struct flash_info));
    
    if (!cfi_read_id(FB, &pInfo->manufacturer, &pInfo->id))
        return false;
    
    if (pInfo->manufacturer == 0xBF) /* SST */
    {
        if (pInfo->id == 0xD6)
        {
            pInfo->size = 256* 1024; /* 256k */
            rb->strcpy(pInfo->name, "SST39VF020");
            return true;
        }
        else if (pInfo->id == 0xD7)
        {
            pInfo->size = 512* 1024; /* 512k */
            rb->strcpy(pInfo->name, "SST39VF040");
            return true;
        }
        else if (pInfo->id == 0x82)
        {
            pInfo->size = 2048* 1024; /* 2 MiB */
            rb->strcpy(pInfo->name, "SST39VF160");
            return true;
        }
        else
            return false;
    }
    return false;
}


/*********** Utility Functions ************/


/* Tool function to calculate a CRC32 across some buffer */
/* third argument is either 0xFFFFFFFF to start or value from last piece */
unsigned crc_32(unsigned char* buf, unsigned len, unsigned crc32)
{
    /* CCITT standard polynomial 0x04C11DB7 */
    static const unsigned crc32_lookup[16] = 
    {   /* lookup table for 4 bits at a time is affordable */
        0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9, 
        0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005, 
        0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61, 
        0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD
    };
    
    unsigned char byte;
    unsigned t;

    while (len--)
    {   
        byte = *buf++; /* get one byte of data */

        /* upper nibble of our data */
        t = crc32 >> 28; /* extract the 4 most significant bits */
        t ^= byte >> 4; /* XOR in 4 bits of data into the extracted bits */
        crc32 <<= 4; /* shift the CRC register left 4 bits */     
        crc32 ^= crc32_lookup[t]; /* do the table lookup and XOR the result */

        /* lower nibble of our data */
        t = crc32 >> 28; /* extract the 4 most significant bits */
        t ^= byte & 0x0F; /* XOR in 4 bits of data into the extracted bits */
        crc32 <<= 4; /* shift the CRC register left 4 bits */     
        crc32 ^= crc32_lookup[t]; /* do the table lookup and XOR the result */
    }
    
    return crc32;
}


/***************** User Interface Functions *****************/
int WaitForButton(void)
{
    int button;
    
    do
    {
        button = rb->button_get(true);
    } while (button & BUTTON_REL);
    
    return button;
}

/* helper for DoUserDialog() */
void ShowFlashInfo(struct flash_info* pInfo)
{
    char buf[32];
    
    if (!pInfo->manufacturer)
    {
        rb->lcd_puts(0, 0, "Flash: M=?? D=??");
        rb->lcd_puts(0, 1, "Impossible to program");
    }
    else
    {
        rb->snprintf(buf, sizeof(buf), "Flash: M=%02x D=%02x",
            pInfo->manufacturer, pInfo->id);
        rb->lcd_puts(0, 0, buf);
        
        
        if (pInfo->size)
        {
            rb->lcd_puts(0, 1, pInfo->name);
            rb->snprintf(buf, sizeof(buf), "Size: %d KB", pInfo->size / 1024);
            rb->lcd_puts(0, 2, buf);
        }
        else
        {
            rb->lcd_puts(0, 1, "Unsupported chip");
        }
        
    }
    
    rb->lcd_update();
}

int load_firmware_file(const char *filename, uint32_t *checksum)
{
    int fd;
    int len, rc;
    int i;
    uint32_t sum;
    
    fd = rb->open(filename,  O_RDONLY);
    if (fd < 0)
        return -1;
    
    len = rb->filesize(fd);
    
    if (audiobuf_size < len)
    {
        rb->splash(HZ*3, true, "Out of memory!");
        rb->close(fd);
        return -2;
    }
    
    rb->read(fd, checksum, 4);
    rb->lseek(fd, FIRMWARE_OFFSET_FILE_DATA, SEEK_SET);
    len -= FIRMWARE_OFFSET_FILE_DATA;
    
    rc = rb->read(fd, audiobuf, len);
    rb->close(fd);
    if (rc != len)
    {
        rb->splash(HZ*3, true, "Read failure");
        return -3;
    }
    
    /* Verify the checksum */
    sum = 0;
    for (i = 0; i < len; i++)
        sum += audiobuf[i];
    
    if (sum != *checksum)
    {
        rb->splash(HZ*3, true, "Checksums mismatch!");
        return -4;
    }
    
    return len;
}

int flash_rockbox(const char *filename)
{
    struct flash_header hdr;
    char buf[32];
    int pos, i, len, rc;
    unsigned long checksum, sum;
    unsigned char *p8;
    uint16_t *p16;
    
    len = load_firmware_file(filename, &checksum);
    if (len < 0)
        return len * 10;
    
    /* Erase the program flash. */
    for (i = 1; i < BOOTLOADER_ERASEGUARD && (i-1)*4096 < len + 32; i++)
    {
        rc = cfi_erase_sector(FB + (SEC_SIZE/2) * i);
        rb->snprintf(buf, sizeof(buf), "Erase: 0x%03x  (%d)", i, rc);
        rb->lcd_puts(0, 3, buf);
        rb->lcd_update();
    }
    
    /* Write the magic and size. */
    rb->memset(&hdr, 0, sizeof(struct flash_header));
    hdr.magic = FLASH_MAGIC;
    hdr.length = len;
    // rb->strncpy(hdr.version, APPSVERSION, sizeof(hdr.version)-1);
    p16 = (uint16_t *)&hdr;
    
    rb->snprintf(buf, sizeof(buf), "Programming");
    rb->lcd_puts(0, 4, buf);
    rb->lcd_update();
    
    pos = FLASH_ENTRYPOINT/2;
    for (i = 0; i < (long)sizeof(struct flash_header)/2; i++)
    {
        cfi_program_word(FB + pos, p16[i]);
        pos++;
    }
    
    p16 = (uint16_t *)audiobuf;
    for (i = 0; i < len/2 && pos < (BOOTLOADER_ENTRYPOINT/2); i++)
        cfi_program_word(FB + pos + i, p16[i]);
    
    /* Verify */
    p8 = (char *)FLASH_ENTRYPOINT;
    p8 += sizeof(struct flash_header);
    sum = 0;
    for (i = 0; i < len; i++)
        sum += p8[i];
    
    if (sum != checksum)
    {
        rb->splash(HZ*3, true, "Verify failed!");
        /* Erase the magic sector so bootloader does not try to load
         * rockbox from flash and crash. */
        cfi_erase_sector(FB + SEC_SIZE/2);
        return -5;
    }
    
    return 0;
}

void show_fatal_error(void)
{
    rb->splash(HZ*30, true, "Disable idle poweroff, connect AC power and DON'T TURN PLAYER OFF!!");
    rb->splash(HZ*30, true, "Contact Rockbox developers as soon as possible!");
    rb->splash(HZ*30, true, "Your device won't be bricked unless you turn off the power");
    rb->splash(HZ*30, true, "Don't use the device before further instructions from Rockbox developers");
}

int flash_bootloader(const char *filename)
{
    char buf[32];
    int pos, i, len, rc;
    unsigned long checksum, sum, crc32;
    unsigned char *p8;
    uint16_t *p16;
    
    (void)buf;
    len = load_firmware_file(filename, &checksum);
    if (len < 0)
        return len * 10;
    
    if (len > 0xFFFF)
    {
        rb->splash(HZ*3, true, "Too big bootloader");
        return -1;
    }
    
    /* Verify the crc32 checksum also. */
    crc32 = crc_32(audiobuf, len, 0xffffffff);
#if 0
    rb->snprintf(buf, sizeof buf, "crc32 = 0x%08x", crc32);
    rb->splash(HZ*10, true, buf);
#else
    if (crc32 != 0xa930906d)
    {
        rb->splash(HZ*3, true, "Untested bootloader");
        return -2;
    }
#endif
    rb->lcd_puts(0, 3, "Processing critical sections...");
    rb->lcd_update();

    /* Erase the boot sector and write a proper reset vector. */
    cfi_erase_sector(FB);
    p16 = (uint16_t *)audiobuf;
    for (i = 0; i < 4; i++)
        cfi_program_word(FB + i, p16[i]);
    
    /* Erase the bootloader flash section. */
    for (i = BOOTLOADER_ENTRYPOINT/SEC_SIZE; i < 0x200; i++)
        rc = cfi_erase_sector(FB + (SEC_SIZE/2) * i);
    
    pos = BOOTLOADER_ENTRYPOINT/2;
    p16 = (uint16_t *)audiobuf;
    for (i = 0; i < len/2; i++)
        cfi_program_word(FB + pos + i, p16[i]);
    
    /* Verify */
    p8 = (char *)BOOTLOADER_ENTRYPOINT;
    sum = 0;
    for (i = 0; i < len; i++)
        sum += p8[i];
    
    if (sum != checksum)
    {
        rb->splash(HZ*3, true, "Verify failed!");
        show_fatal_error();
        return -5;
    }
    
    p8 = (char *)FB;
    for (i = 0; i < 8; i++)
    {
        if (p8[i] != audiobuf[i])
        {
            rb->splash(HZ*3, true, "Bootvector corrupt!");
            show_fatal_error();
            break;
        }
    }
    
    return 0;
}

/* Kind of our main function, defines the application flow. */
void DoUserDialog(char* filename)
{
    struct flash_info fi;
    int rc; /* generic return code */

    /* this can only work if Rockbox runs in DRAM, not flash ROM */
    if ((uint16_t*)rb >= FB && (uint16_t*)rb < FB + 4096*1024) /* 4 MB max */
    {   /* we're running from flash */
        rb->splash(HZ*3, true, "Not from ROM");
        return; /* exit */
    }

    /* refuse to work if the power may fail meanwhile */
    if (!rb->battery_level_safe())
    {
        rb->splash(HZ*3, true, "Battery too low!");
        return; /* exit */
    }
    
    rb->lcd_setfont(FONT_SYSFIXED);

    rc = cfi_get_flash_info(&fi);
    ShowFlashInfo(&fi);
    if (fi.size == 0) /* no valid chip */
    {
        rb->splash(HZ*3, true, "Sorry!");
        return; /* exit */
    }

    /* Debug? */
#if 0
    rb->memcpy(&hdr, (uint8_t *)(FLASH_ENTRYPOINT), sizeof(struct flash_header));
    rb->snprintf(buf, sizeof(buf), "Magic: 0x%03x", hdr.magic);
    rb->lcd_puts(0, 3, buf);
    rb->snprintf(buf, sizeof(buf), "Size: 0x%03x", hdr.length);
    rb->lcd_puts(0, 4, buf);
    rb->lcd_update();
    rb->sleep(HZ*10);
    
    rb->memcpy(&hdr, (uint8_t *)(FLASH_ENTRYPOINT/2), sizeof(struct flash_header));
    rb->snprintf(buf, sizeof(buf), "Magic: 0x%03x", hdr.magic);
    rb->lcd_puts(0, 3, buf);
    rb->snprintf(buf, sizeof(buf), "Size: 0x%03x", hdr.length);
    rb->lcd_puts(0, 4, buf);
    rb->lcd_update();
    rb->sleep(HZ*10);
#endif
    
    /* Restore? */
#if 0
    fd = rb->open("/internal_rom_000000-1FFFFF.bin",  O_RDONLY);
    if (fd < 0)
        return ;
    len = rb->filesize(fd);
    
    /* Erase the program flash. */
    for (i = 1; i < 0x1EF; i++)
    {
        rc = cfi_erase_sector(FB + (SEC_SIZE/2) * i);
        rb->snprintf(buf, sizeof(buf), "Erase: 0x%03x  (%d)", i, rc);
        rb->lcd_puts(0, 3, buf);
        rb->lcd_update();
    }
    
    i = FLASH_ENTRYPOINT/2;
    rb->lseek(fd, i*2, SEEK_SET);
    len -= i*2 - 0xffff;
    for (; len > 0 && i < (0x1F0000/2); i++)
    {
        rb->read(fd, bytes, 2);
        cfi_program_word(FB + i, (bytes[0] << 8) | bytes[1]);
        len -= 2;
    }
    
    rb->close(fd);
    return ;
#endif
    
    if (filename == NULL)
    {
        rb->splash(HZ*3, true, "Please use this plugin with \"Open with...\"");
        return ;
    }
    
    audiobuf = rb->plugin_get_audio_buffer(&audiobuf_size);
    
    if (rb->strcasestr(filename, "/rockbox.iriver"))
        flash_rockbox(filename);
    else if (rb->strcasestr(filename, "/bootloader.iriver"))
        flash_bootloader(filename);
    else
        rb->splash(HZ*3, true, "Unknown file type");
}


/***************** Plugin Entry Point *****************/

enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
{
    int oldmode;

    rb = api; /* copy to global api pointer */
    
    /* now go ahead and have fun! */
    oldmode = rb->system_memory_guard(MEMGUARD_NONE); /*disable memory guard */
    DoUserDialog((char*) parameter);
    rb->system_memory_guard(oldmode);              /* re-enable memory guard */

    return PLUGIN_OK;
}

#endif /* ifdef PLATFORM_ID */
#endif /* #ifndef SIMULATOR */