summaryrefslogtreecommitdiffstats
path: root/target/linux/adm5120/files/drivers/mtd/maps/adm5120-flash.c
blob: ed407ebdec620773f1308217b13288775e258a4a (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
/*
 *  Platform driver for NOR flash devices on ADM5120 based boards
 *
 *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
 *
 *  This file was derived from: drivers/mtd/map/physmap.c
 *	Copyright (C) 2003 MontaVista Software Inc.
 *	Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/platform_device.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/mach-adm5120/adm5120_defs.h>
#include <asm/mach-adm5120/adm5120_switch.h>
#include <asm/mach-adm5120/adm5120_mpmc.h>
#include <asm/mach-adm5120/adm5120_platform.h>

#define DRV_NAME	"adm5120-flash"
#define DRV_DESC	"ADM5120 flash MAP driver"
#define MAX_PARSED_PARTS 8

#ifdef ADM5120_FLASH_DEBUG
#define MAP_DBG(m, f, a...)	printk(KERN_INFO "%s: " f, (m->name) , ## a)
#else
#define MAP_DBG(m, f, a...)	do {} while (0)
#endif
#define MAP_ERR(m, f, a...)	printk(KERN_ERR "%s: " f, (m->name) , ## a)
#define MAP_INFO(m, f, a...)	printk(KERN_INFO "%s: " f, (m->name) , ## a)

struct adm5120_map_info {
	struct map_info	map;
	void 		(*switch_bank)(unsigned);
	unsigned long	window_size;
};

struct adm5120_flash_info {
	struct mtd_info		*mtd;
	struct resource		*res;
	struct platform_device	*dev;
	struct adm5120_map_info	amap;
#ifdef CONFIG_MTD_PARTITIONS
	int			nr_parts;
	struct mtd_partition	*parts[MAX_PARSED_PARTS];
#endif
};

struct flash_desc {
	u32	phys;
	u32	srs_shift;
};

/*
 * Globals
 */
static DEFINE_SPINLOCK(adm5120_flash_spin);
#define FLASH_LOCK()	spin_lock(&adm5120_flash_spin)
#define FLASH_UNLOCK()	spin_unlock(&adm5120_flash_spin)

static u32 flash_bankwidths[4] = { 1, 2, 4, 0 };

static u32 flash_sizes[8] = {
	0, 512*1024, 1024*1024, 2*1024*1024,
	4*1024*1024, 0, 0, 0
};

static struct flash_desc flash_descs[2] = {
	{
		.phys		= ADM5120_SRAM0_BASE,
		.srs_shift	= MEMCTRL_SRS0_SHIFT,
	}, {
		.phys		= ADM5120_SRAM1_BASE,
		.srs_shift	= MEMCTRL_SRS1_SHIFT,
	}
};

static const char *probe_types[] = {
	"cfi_probe",
	"jedec_probe",
	"map_rom",
	NULL
};

#ifdef CONFIG_MTD_PARTITIONS
static const char *parse_types[] = {
	"cmdlinepart",
#ifdef CONFIG_MTD_REDBOOT_PARTS
	"RedBoot",
#endif
#ifdef CONFIG_MTD_MYLOADER_PARTS
	"MyLoader",
#endif
};
#endif

#define BANK_SIZE	(2<<20)
#define BANK_SIZE_MAX	(4<<20)
#define BANK_OFFS_MASK	(BANK_SIZE-1)
#define BANK_START_MASK	(~BANK_OFFS_MASK)

static inline struct adm5120_map_info *map_to_amap(struct map_info *map)
{
	return (struct adm5120_map_info *)map;
}

static void adm5120_flash_switchbank(struct map_info *map,
		unsigned long ofs)
{
	struct adm5120_map_info *amap = map_to_amap(map);
	unsigned bank;

	if (amap->switch_bank == NULL)
		return;

	bank = (ofs & BANK_START_MASK) >> 21;
	if (bank > 1)
		BUG();

	MAP_DBG(map, "switching to bank %u, ofs=%lX\n", bank, ofs);
	amap->switch_bank(bank);
}

static map_word adm5120_flash_read(struct map_info *map, unsigned long ofs)
{
	struct adm5120_map_info *amap = map_to_amap(map);
	map_word ret;

	MAP_DBG(map, "reading from ofs %lX\n", ofs);

	if (ofs >= amap->window_size)
		return map_word_ff(map);

	FLASH_LOCK();
	adm5120_flash_switchbank(map, ofs);
	ret = inline_map_read(map, (ofs & (amap->window_size-1)));
	FLASH_UNLOCK();

	return ret;
}

static void adm5120_flash_write(struct map_info *map, const map_word datum,
		unsigned long ofs)
{
	struct adm5120_map_info *amap = map_to_amap(map);

	MAP_DBG(map, "writing to ofs %lX\n", ofs);

	if (ofs > amap->window_size)
		return;

	FLASH_LOCK();
	adm5120_flash_switchbank(map, ofs);
	inline_map_write(map, datum, (ofs & (amap->window_size-1)));
	FLASH_UNLOCK();
}

static void adm5120_flash_copy_from(struct map_info *map, void *to,
		unsigned long from, ssize_t len)
{
	struct adm5120_map_info *amap = map_to_amap(map);
	char *p;
	ssize_t t;

	MAP_DBG(map, "copy_from, to=%lX, from=%lX, len=%lX\n",
		(unsigned long)to, from, (unsigned long)len);

	if (from > amap->window_size)
		return;

	p = (char *)to;
	while (len > 0) {
		t = len;
		if ((from < BANK_SIZE) && ((from+len) > BANK_SIZE))
			t = BANK_SIZE-from;

		FLASH_LOCK();
		MAP_DBG(map, "copying %lu byte(s) from %lX to %lX\n",
			(unsigned long)t, (from & (amap->window_size-1)),
			(unsigned long)p);
		adm5120_flash_switchbank(map, from);
		inline_map_copy_from(map, p, (from & (amap->window_size-1)), t);
		FLASH_UNLOCK();
		p += t;
		from += t;
		len -= t;
	}
}

static int adm5120_flash_initres(struct adm5120_flash_info *info)
{
	struct map_info *map = &info->amap.map;
	int err = 0;

	info->res = request_mem_region(map->phys, info->amap.window_size,
			map->name);
	if (info->res == NULL) {
		MAP_ERR(map, "could not reserve memory region\n");
		err = -ENOMEM;
		goto out;
	}

	map->virt = ioremap_nocache(map->phys, info->amap.window_size);
	if (map->virt == NULL) {
		MAP_ERR(map, "failed to ioremap flash region\n");
		err = -ENOMEM;
		goto out;
	}

out:
	return err;
}

static int adm5120_flash_initinfo(struct adm5120_flash_info *info,
		struct platform_device *dev)
{
	struct map_info *map = &info->amap.map;
	struct adm5120_flash_platform_data *pdata = dev->dev.platform_data;
	struct flash_desc *fdesc;
	u32 t = 0;

	map->name = dev_name(&dev->dev);

	if (dev->id > 1) {
		MAP_ERR(map, "invalid flash id\n");
		goto err_out;
	}

	fdesc = &flash_descs[dev->id];

	if (pdata)
		info->amap.window_size = pdata->window_size;

	if (info->amap.window_size == 0) {
		/* get memory window size */
		t = SW_READ_REG(SWITCH_REG_MEMCTRL) >> fdesc->srs_shift;
		t &= MEMCTRL_SRS_MASK;
		info->amap.window_size = flash_sizes[t];
	}

	if (info->amap.window_size == 0) {
		MAP_ERR(map, "unable to determine window size\n");
		goto err_out;
	}

	/* get flash bus width */
	switch (dev->id) {
	case 0:
		t = MPMC_READ_REG(SC1) & SC_MW_MASK;
		break;
	case 1:
		t = MPMC_READ_REG(SC0) & SC_MW_MASK;
		break;
	}
	map->bankwidth = flash_bankwidths[t];
	if (map->bankwidth == 0) {
		MAP_ERR(map, "invalid bus width detected\n");
		goto err_out;
	}

	map->phys = fdesc->phys;
	map->size = BANK_SIZE_MAX;

	simple_map_init(map);
	map->read = adm5120_flash_read;
	map->write = adm5120_flash_write;
	map->copy_from = adm5120_flash_copy_from;

	if (pdata) {
		map->set_vpp = pdata->set_vpp;
		info->amap.switch_bank = pdata->switch_bank;
	}

	info->dev = dev;

	MAP_INFO(map, "probing at 0x%lX, size:%ldKiB, width:%d bits\n",
		(unsigned long)map->phys,
		(unsigned long)info->amap.window_size >> 10,
		map->bankwidth*8);

	return 0;

err_out:
	return -ENODEV;
}

static void adm5120_flash_initbanks(struct adm5120_flash_info *info)
{
	struct map_info *map = &info->amap.map;

	if (info->mtd->size <= BANK_SIZE)
		/* no bank switching needed */
		return;

	if (info->amap.switch_bank) {
		info->amap.window_size = info->mtd->size;
		return;
	}

	MAP_ERR(map, "reduce visibility from %ldKiB to %ldKiB\n",
		(unsigned long)map->size >> 10,
		(unsigned long)info->mtd->size >> 10);

	info->mtd->size = info->amap.window_size;
}

#ifdef CONFIG_MTD_PARTITIONS
static int adm5120_flash_initparts(struct adm5120_flash_info *info)
{
	struct adm5120_flash_platform_data *pdata;
	struct map_info *map = &info->amap.map;
	int num_parsers;
	const char *parser[2];
	int err = 0;
	int nr_parts;
	int i;

	info->nr_parts = 0;

	pdata = info->dev->dev.platform_data;
	if (pdata == NULL)
		goto out;

	if (pdata->nr_parts) {
		MAP_INFO(map, "adding static partitions\n");
		err = add_mtd_partitions(info->mtd, pdata->parts,
			pdata->nr_parts);
		if (err == 0) {
			info->nr_parts += pdata->nr_parts;
			goto out;
		}
	}

	num_parsers = ARRAY_SIZE(parse_types);
	if (num_parsers > MAX_PARSED_PARTS)
		num_parsers = MAX_PARSED_PARTS;

	parser[1] = NULL;
	for (i = 0; i < num_parsers; i++) {
		parser[0] = parse_types[i];

		MAP_INFO(map, "parsing \"%s\" partitions\n",
			parser[0]);
		nr_parts = parse_mtd_partitions(info->mtd, parser,
			&info->parts[i], 0);

		if (nr_parts <= 0)
			continue;

		MAP_INFO(map, "adding \"%s\" partitions\n",
			parser[0]);

		err = add_mtd_partitions(info->mtd, info->parts[i], nr_parts);
		if (err)
			break;

		info->nr_parts += nr_parts;
	}
out:
	return err;
}
#else
static int adm5120_flash_initparts(struct adm5120_flash_info *info)
{
	return 0;
}
#endif /* CONFIG_MTD_PARTITIONS */

#ifdef CONFIG_MTD_PARTITIONS
static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
{
	int i;

	if (info->nr_parts) {
		del_mtd_partitions(info->mtd);
		for (i = 0; i < MAX_PARSED_PARTS; i++)
			if (info->parts[i] != NULL)
				kfree(info->parts[i]);
	} else {
		del_mtd_device(info->mtd);
	}
}
#else
static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
{
	del_mtd_device(info->mtd);
}
#endif

static int adm5120_flash_remove(struct platform_device *dev)
{
	struct adm5120_flash_info *info;

	info = platform_get_drvdata(dev);
	if (info == NULL)
		return 0;

	platform_set_drvdata(dev, NULL);

	if (info->mtd != NULL) {
		adm5120_flash_remove_mtd(info);
		map_destroy(info->mtd);
	}

	if (info->amap.map.virt != NULL)
		iounmap(info->amap.map.virt);

	if (info->res != NULL) {
		release_resource(info->res);
		kfree(info->res);
	}

	return 0;
}

static int adm5120_flash_probe(struct platform_device *dev)
{
	struct adm5120_flash_info *info;
	struct map_info *map;
	const char **probe_type;
	int err;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (info == NULL) {
		err = -ENOMEM;
		goto err_out;
	}

	platform_set_drvdata(dev, info);

	err = adm5120_flash_initinfo(info, dev);
	if (err)
		goto err_out;

	err = adm5120_flash_initres(info);
	if (err)
		goto err_out;

	map = &info->amap.map;
	for (probe_type = probe_types; info->mtd == NULL && *probe_type != NULL;
		probe_type++)
		info->mtd = do_map_probe(*probe_type, map);

	if (info->mtd == NULL) {
		MAP_ERR(map, "map_probe failed\n");
		err = -ENXIO;
		goto err_out;
	}

	adm5120_flash_initbanks(info);

	if (info->mtd->size < info->amap.window_size) {
		/* readjust resources */
		iounmap(map->virt);
		release_resource(info->res);
		kfree(info->res);

		info->amap.window_size = info->mtd->size;
		map->size = info->mtd->size;
		MAP_INFO(map, "reducing map size to %ldKiB\n",
			(unsigned long)map->size >> 10);
		err = adm5120_flash_initres(info);
		if (err)
			goto err_out;
	}

	MAP_INFO(map, "found at 0x%lX, size:%ldKiB, width:%d bits\n",
		(unsigned long)map->phys, (unsigned long)info->mtd->size >> 10,
		map->bankwidth*8);

	info->mtd->owner = THIS_MODULE;

	err = adm5120_flash_initparts(info);
	if (err)
		goto err_out;

	if (info->nr_parts == 0) {
		MAP_INFO(map, "no partitions available, registering "
			"whole flash\n");
		add_mtd_device(info->mtd);
	}

	return 0;

err_out:
	adm5120_flash_remove(dev);
	return err;
}

#ifdef CONFIG_PM
static int adm5120_flash_suspend(struct platform_device *dev,
		pm_message_t state)
{
	struct adm5120_flash_info *info = platform_get_drvdata(dev);
	int ret = 0;

	if (info)
		ret = info->mtd->suspend(info->mtd);

	return ret;
}

static int adm5120_flash_resume(struct platform_device *dev)
{
	struct adm5120_flash_info *info = platform_get_drvdata(dev);

	if (info)
		info->mtd->resume(info->mtd);

	return 0;
}

static void adm5120_flash_shutdown(struct platform_device *dev)
{
	struct adm5120_flash_info *info = platform_get_drvdata(dev);

	if (info && info->mtd->suspend(info->mtd) == 0)
		info->mtd->resume(info->mtd);
}
#endif

static struct platform_driver adm5120_flash_driver = {
	.probe		= adm5120_flash_probe,
	.remove		= adm5120_flash_remove,
#ifdef CONFIG_PM
	.suspend	= adm5120_flash_suspend,
	.resume		= adm5120_flash_resume,
	.shutdown	= adm5120_flash_shutdown,
#endif
	.driver		= {
		.name	= DRV_NAME,
	},
};

static int __init adm5120_flash_init(void)
{
	int err;

	err = platform_driver_register(&adm5120_flash_driver);

	return err;
}

static void __exit adm5120_flash_exit(void)
{
	platform_driver_unregister(&adm5120_flash_driver);
}

module_init(adm5120_flash_init);
module_exit(adm5120_flash_exit);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_DESCRIPTION(DRV_DESC);