summaryrefslogtreecommitdiff
path: root/target/linux/brcm47xx/files/drivers/mtd/maps/bcm47xx-flash.c
blob: a9bdc9642d63f7d83437339461da66d0d4fcd790 (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
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
/*
 *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
 *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
 *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
 *
 *  original functions for finding root filesystem from Mike Baker 
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 * 
 *  Copyright 2001-2003, Broadcom Corporation
 *  All Rights Reserved.
 * 
 *  THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
 *  KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
 *  SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
 *  FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
 *
 *  Flash mapping for BCM947XX boards
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif
#include <linux/crc32.h>
#ifdef CONFIG_SSB
#include <linux/ssb/ssb.h>
#endif
#include <asm/io.h>
#include <asm/mach-bcm47xx/nvram.h>
#include <asm/fw/cfe/cfe_api.h>


#define TRX_MAGIC	0x30524448	/* "HDR0" */
#define TRX_VERSION	1
#define TRX_MAX_LEN	0x3A0000
#define TRX_NO_HEADER	1		/* Do not write TRX header */	
#define TRX_GZ_FILES	0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
#define TRX_MAX_OFFSET	3

struct trx_header {
	u32 magic;		/* "HDR0" */
	u32 len;		/* Length of file including header */
	u32 crc32;		/* 32-bit CRC from flag_version to end of file */
	u32 flag_version;	/* 0:15 flags, 16:31 version */
	u32 offsets[TRX_MAX_OFFSET];	/* Offsets of partitions from start of header */
};

/* for Edimax Print servers which use an additional header
 * then the firmware on flash looks like :
 * EDIMAX HEADER | TRX HEADER
 * As this header is 12 bytes long we have to handle it
 * and skip it to find the TRX header
 */
#define EDIMAX_PS_HEADER_MAGIC	0x36315350 /*  "PS16"  */
#define EDIMAX_PS_HEADER_LEN	0xc /* 12 bytes long for edimax header */

#define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
#define NVRAM_SPACE 0x8000
#define WINDOW_ADDR 0x1fc00000
#define WINDOW_SIZE 0x400000
#define BUSWIDTH 2

#define ROUTER_NETGEAR_WGR614L         1
#define ROUTER_NETGEAR_WNR834B         2
#define ROUTER_NETGEAR_WNDR3300        3
#define ROUTER_NETGEAR_WNR3500L        4

#ifdef CONFIG_SSB
extern struct ssb_bus ssb_bcm47xx;
#endif
static struct mtd_info *bcm47xx_mtd;

static void bcm47xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
	if (len==1) {
		memcpy_fromio(to, map->virt + from, len);
	} else {
		int i;
		u16 *dest = (u16 *) to;
		u16 *src  = (u16 *) (map->virt + from);
		for (i = 0; i < (len / 2); i++) {
			dest[i] = src[i];
		}
		if (len & 1)
			*((u8 *)dest+len-1) = src[i] & 0xff;
	}
}

static struct map_info bcm47xx_map = {
	name: "Physically mapped flash",
	size: WINDOW_SIZE,
	bankwidth: BUSWIDTH,
	phys: WINDOW_ADDR,
};

#ifdef CONFIG_MTD_PARTITIONS

static struct mtd_partition bcm47xx_parts[] = {
	{ name: "cfe",	offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
	{ name: "linux", offset: 0, size: 0, },
	{ name: "rootfs", offset: 0, size: 0, },
	{ name: "nvram", offset: 0, size: 0, },
	{ name: NULL, },
};

static int __init
find_cfe_size(struct mtd_info *mtd, size_t size)
{
	struct trx_header *trx;
	unsigned char buf[512];
	int off;
	size_t len;
	int blocksize;

	trx = (struct trx_header *) buf;

	blocksize = mtd->erasesize;
	if (blocksize < 0x10000)
		blocksize = 0x10000;

	for (off = (128*1024); off < size; off += blocksize) {
		memset(buf, 0xe5, sizeof(buf));

		/*
		 * Read into buffer 
		 */
		if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
		    len != sizeof(buf))
			continue;

		if (le32_to_cpu(trx->magic) == EDIMAX_PS_HEADER_MAGIC) {
			if (mtd->read(mtd, off + EDIMAX_PS_HEADER_LEN,
			    sizeof(buf), &len, buf) || len != sizeof(buf)) {
				continue;
			} else {
				printk(KERN_NOTICE"Found edimax header\n");
			}
		}

		/* found a TRX header */
		if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
			goto found;
		}
	}

	printk(KERN_NOTICE
	       "%s: Couldn't find bootloader size\n",
	       mtd->name);
	return -1;

 found:
	printk(KERN_NOTICE "bootloader size: %d\n", off);
	return off;

}

/*
 * Copied from mtdblock.c
 *
 * Cache stuff...
 * 
 * Since typical flash erasable sectors are much larger than what Linux's
 * buffer cache can handle, we must implement read-modify-write on flash
 * sectors for each block write requests.  To avoid over-erasing flash sectors
 * and to speed things up, we locally cache a whole flash sector while it is
 * being written to until a different sector is required.
 */

static void erase_callback(struct erase_info *done)
{
	wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
	wake_up(wait_q);
}

static int erase_write (struct mtd_info *mtd, unsigned long pos, 
			int len, const char *buf)
{
	struct erase_info erase;
	DECLARE_WAITQUEUE(wait, current);
	wait_queue_head_t wait_q;
	size_t retlen;
	int ret;

	/*
	 * First, let's erase the flash block.
	 */

	init_waitqueue_head(&wait_q);
	erase.mtd = mtd;
	erase.callback = erase_callback;
	erase.addr = pos;
	erase.len = len;
	erase.priv = (u_long)&wait_q;

	set_current_state(TASK_INTERRUPTIBLE);
	add_wait_queue(&wait_q, &wait);

	ret = mtd->erase(mtd, &erase);
	if (ret) {
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&wait_q, &wait);
		printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
				     "on \"%s\" failed\n",
			pos, len, mtd->name);
		return ret;
	}

	schedule();  /* Wait for erase to finish. */
	remove_wait_queue(&wait_q, &wait);

	/*
	 * Next, write data to flash.
	 */

	ret = mtd->write (mtd, pos, len, &retlen, buf);
	if (ret)
		return ret;
	if (retlen != len)
		return -EIO;
	return 0;
}


static int __init
find_dual_image_off (struct mtd_info *mtd, size_t size)
{
	struct trx_header trx;
	int off, blocksize;
	size_t len;

	blocksize = mtd->erasesize;
	if (blocksize < 0x10000)
		blocksize = 0x10000;

	for (off = (128*1024); off < size; off += blocksize) {
		memset(&trx, 0xe5, sizeof(trx));
		/*
		* Read into buffer 
		*/
		if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
		    len != sizeof(trx))
			continue;
		/* found last TRX header */
		if (le32_to_cpu(trx.magic) == TRX_MAGIC){ 
			if (le32_to_cpu(trx.flag_version >> 16)==2){
				printk("dual image TRX header found\n");
				return size/2;
			} else {
				return 0;
			}
		}
	}
	return 0;
}


static int __init
find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
{
	struct trx_header trx, *trx2;
	unsigned char buf[512], *block;
	int off, blocksize, trxoff = 0;
	u32 i, crc = ~0;
	size_t len;
	bool edimax = false;

	blocksize = mtd->erasesize;
	if (blocksize < 0x10000)
		blocksize = 0x10000;

	for (off = (128*1024); off < size; off += blocksize) {
		memset(&trx, 0xe5, sizeof(trx));

		/*
		 * Read into buffer 
		 */
		if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
		    len != sizeof(trx))
			continue;

		/* found an edimax header */
		if (le32_to_cpu(trx.magic) == EDIMAX_PS_HEADER_MAGIC) {
			/* read the correct trx header */
			if (mtd->read(mtd, off + EDIMAX_PS_HEADER_LEN,
			    sizeof(trx), &len, (char *) &trx) ||
			    len != sizeof(trx)) {
				continue;
			} else {
				printk(KERN_NOTICE"Found an edimax ps header\n");
				edimax = true;
			}
		}

		/* found a TRX header */
		if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
			part->offset = le32_to_cpu(trx.offsets[2]) ? : 
				le32_to_cpu(trx.offsets[1]);
			part->size = le32_to_cpu(trx.len); 

			part->size -= part->offset;
			part->offset += off;
			if (edimax) {
				off += EDIMAX_PS_HEADER_LEN;
				trxoff = EDIMAX_PS_HEADER_LEN;
			}

			goto found;
		}
	}

	printk(KERN_NOTICE
	       "%s: Couldn't find root filesystem\n",
	       mtd->name);
	return -1;

 found:
	printk(KERN_NOTICE"TRX offset : %lx\n", trxoff);
	if (part->size == 0)
		return 0;
	
	if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
		return 0;

	/* Move the fs outside of the trx */
	part->size = 0;

	if (trx.len != part->offset + part->size - off) {
		/* Update the trx offsets and length */
		trx.len = part->offset + part->size - off;
	
		/* Update the trx crc32 */
		for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
			if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
				return 0;
			crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
		}
		trx.crc32 = crc;

		/* read first eraseblock from the trx */
		block = kmalloc(mtd->erasesize, GFP_KERNEL);
		trx2 = (struct trx_header *) block;
		if (mtd->read(mtd, off - trxoff, mtd->erasesize, &len, block) || len != mtd->erasesize) {
			printk("Error accessing the first trx eraseblock\n");
			return 0;
		}
		
		printk("Updating TRX offsets and length:\n");
		printk("old trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n", trx2->offsets[0], trx2->offsets[1], trx2->offsets[2], trx2->len, trx2->crc32);
		printk("new trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n",   trx.offsets[0],   trx.offsets[1],   trx.offsets[2],   trx.len, trx.crc32);

		/* Write updated trx header to the flash */
		memcpy(block + trxoff, &trx, sizeof(trx));
		if (mtd->unlock)
			mtd->unlock(mtd, off - trxoff, mtd->erasesize);
		erase_write(mtd, off - trxoff, mtd->erasesize, block);
		if (mtd->sync)
			mtd->sync(mtd);
		kfree(block);
		printk("Done\n");
	}
	
	return part->size;
}

static int get_router(void)
{
	char buf[20];
	u32 boardnum = 0;
	u16 boardtype = 0;
	u16 boardrev = 0;
	u32 boardflags = 0;
	u16 sdram_init = 0;
	u16 cardbus = 0;

	if (nvram_getenv("boardnum", buf, sizeof(buf)) >= 0)
		boardnum = simple_strtoul(buf, NULL, 0);
	if (nvram_getenv("boardtype", buf, sizeof(buf)) >= 0)
		boardtype = simple_strtoul(buf, NULL, 0);
	if (nvram_getenv("boardrev", buf, sizeof(buf)) >= 0)
		boardrev = simple_strtoul(buf, NULL, 0);
	if (nvram_getenv("boardflags", buf, sizeof(buf)) >= 0)
		boardflags = simple_strtoul(buf, NULL, 0);
	if (nvram_getenv("sdram_init", buf, sizeof(buf)) >= 0)
		sdram_init = simple_strtoul(buf, NULL, 0);
	if (nvram_getenv("cardbus", buf, sizeof(buf)) >= 0)
		cardbus = simple_strtoul(buf, NULL, 0);

	if ((boardnum == 8 || boardnum == 01)
	  && boardtype == 0x0472 && cardbus == 1) {
		/* Netgear WNR834B, Netgear WNR834Bv2 */
		return ROUTER_NETGEAR_WNR834B;
	}

	if (boardnum == 01 && boardtype == 0x0472 && boardrev == 0x23) {
		/* Netgear WNDR-3300 */
		return ROUTER_NETGEAR_WNDR3300;
	}

	if ((boardnum == 83258 || boardnum == 01)
	  && boardtype == 0x048e
	  && (boardrev == 0x11 || boardrev == 0x10)
	  && boardflags == 0x750
	  && sdram_init == 0x000A) {
		/* Netgear WGR614v8/L/WW 16MB ram, cfe v1.3 or v1.5 */
		return ROUTER_NETGEAR_WGR614L;
	}

	if ((boardnum == 1 || boardnum == 3500)
	  && boardtype == 0x04CF
	  && (boardrev == 0x1213 || boardrev == 02)) {
		/* Netgear WNR3500v2/U/L */
		return ROUTER_NETGEAR_WNR3500L;
	}

	return 0;
}

struct mtd_partition * __init
init_mtd_partitions(struct mtd_info *mtd, size_t size)
{
	int cfe_size;
	int dual_image_offset = 0;
	/* e.g Netgear 0x003e0000-0x003f0000 : "board_data", we exclude this
	 * part from our mapping to prevent overwriting len/checksum on e.g.
	 * Netgear WGR614v8/L/WW
	 */
	int board_data_size = 0;

	switch (get_router()) {
	case ROUTER_NETGEAR_WGR614L:
	case ROUTER_NETGEAR_WNR834B:
	case ROUTER_NETGEAR_WNDR3300:
	case ROUTER_NETGEAR_WNR3500L:
		/* Netgear: checksum is @ 0x003AFFF8 for 4M flash or checksum
		 * is @ 0x007AFFF8 for 8M flash
		 */
		board_data_size = 4 * mtd->erasesize;
		break;
	}

	if ((cfe_size = find_cfe_size(mtd,size)) < 0)
		return NULL;

	/* boot loader */
	bcm47xx_parts[0].offset = 0;
	bcm47xx_parts[0].size   = cfe_size;

	/* nvram */
	if (cfe_size != 384 * 1024) {
		bcm47xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
		bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
	} else {
		/* nvram (old 128kb config partition on netgear wgt634u) */
		bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
		bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
	}

	/* dual image offset*/
	printk("Looking for dual image\n");
	dual_image_offset=find_dual_image_off(mtd,size);
	/* linux (kernel and rootfs) */
	if (cfe_size != 384 * 1024) {
		bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
		bcm47xx_parts[1].size   = bcm47xx_parts[3].offset - dual_image_offset -
			bcm47xx_parts[1].offset - board_data_size;
	} else {
		/* do not count the elf loader, which is on one block */
		bcm47xx_parts[1].offset = bcm47xx_parts[0].size + 
			bcm47xx_parts[3].size + mtd->erasesize;
		bcm47xx_parts[1].size   = size - 
			bcm47xx_parts[0].size - 
			(2*bcm47xx_parts[3].size) - 
			mtd->erasesize - board_data_size;
	}

	/* find and size rootfs */
	find_root(mtd,size,&bcm47xx_parts[2]);
	bcm47xx_parts[2].size = size - dual_image_offset -
				bcm47xx_parts[2].offset -
				bcm47xx_parts[3].size - board_data_size;

	return bcm47xx_parts;
}
#endif

int __init init_bcm47xx_map(void)
{
#ifdef CONFIG_SSB
	struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
#endif
	size_t size;
	int ret = 0;
#ifdef CONFIG_MTD_PARTITIONS
	struct mtd_partition *parts;
	int i;
#endif

#ifdef CONFIG_SSB
	u32 window = mcore->flash_window;
	u32 window_size = mcore->flash_window_size;

	printk("flash init: 0x%08x 0x%08x\n", window, window_size);
	bcm47xx_map.phys = window;
	bcm47xx_map.size = window_size;
	bcm47xx_map.bankwidth = mcore->flash_buswidth;
	bcm47xx_map.virt = ioremap_nocache(window, window_size);
#else
	printk("flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
	bcm47xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
#endif

	if (!bcm47xx_map.virt) {
		printk("Failed to ioremap\n");
		return -EIO;
	}

	simple_map_init(&bcm47xx_map);
	
	if (!(bcm47xx_mtd = do_map_probe("cfi_probe", &bcm47xx_map))) {
		printk("Failed to do_map_probe\n");
		iounmap((void *)bcm47xx_map.virt);
		return -ENXIO;
	}

	/* override copy_from routine */
 	bcm47xx_map.copy_from = bcm47xx_map_copy_from;

	bcm47xx_mtd->owner = THIS_MODULE;

	size = bcm47xx_mtd->size;

	printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);

#ifdef CONFIG_MTD_PARTITIONS
	parts = init_mtd_partitions(bcm47xx_mtd, size);
	for (i = 0; parts[i].name; i++);
	ret = add_mtd_partitions(bcm47xx_mtd, parts, i);
	if (ret) {
		printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
		goto fail;
	}
#endif
	return 0;

 fail:
	if (bcm47xx_mtd)
		map_destroy(bcm47xx_mtd);
	if (bcm47xx_map.virt)
		iounmap((void *)bcm47xx_map.virt);
	bcm47xx_map.virt = 0;
	return ret;
}

void __exit cleanup_bcm47xx_map(void)
{
#ifdef CONFIG_MTD_PARTITIONS
	del_mtd_partitions(bcm47xx_mtd);
#endif
	map_destroy(bcm47xx_mtd);
	iounmap((void *)bcm47xx_map.virt);
}

module_init(init_bcm47xx_map);
module_exit(cleanup_bcm47xx_map);