summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/raw/nand_onfi.c
blob: 7586befce7f920defe3dcceefb2d8ee08172f281 (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
// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
 *		  2002-2006 Thomas Gleixner (tglx@linutronix.de)
 *
 *  Credits:
 *	David Woodhouse for adding multichip support
 *
 *	Aleph One Ltd. and Toby Churchill Ltd. for supporting the
 *	rework for 2K page size chips
 *
 * This file contains all ONFI helpers.
 */

#include <linux/slab.h>

#include "internals.h"

#define ONFI_PARAM_PAGES 3

u16 onfi_crc16(u16 crc, u8 const *p, size_t len)
{
	int i;
	while (len--) {
		crc ^= *p++ << 8;
		for (i = 0; i < 8; i++)
			crc = (crc << 1) ^ ((crc & 0x8000) ? 0x8005 : 0);
	}

	return crc;
}

/* Parse the Extended Parameter Page. */
static int nand_flash_detect_ext_param_page(struct nand_chip *chip,
					    struct nand_onfi_params *p)
{
	struct nand_device *base = &chip->base;
	struct nand_ecc_props requirements;
	struct onfi_ext_param_page *ep;
	struct onfi_ext_section *s;
	struct onfi_ext_ecc_info *ecc;
	uint8_t *cursor;
	int ret;
	int len;
	int i;

	len = le16_to_cpu(p->ext_param_page_length) * 16;
	ep = kmalloc(len, GFP_KERNEL);
	if (!ep)
		return -ENOMEM;

	/*
	 * Use the Change Read Column command to skip the ONFI param pages and
	 * ensure we read at the right location.
	 */
	ret = nand_change_read_column_op(chip,
					 sizeof(*p) * p->num_of_param_pages,
					 ep, len, true);
	if (ret)
		goto ext_out;

	ret = -EINVAL;
	if ((onfi_crc16(ONFI_CRC_BASE, ((uint8_t *)ep) + 2, len - 2)
		!= le16_to_cpu(ep->crc))) {
		pr_debug("fail in the CRC.\n");
		goto ext_out;
	}

	/*
	 * Check the signature.
	 * Do not strictly follow the ONFI spec, maybe changed in future.
	 */
	if (strncmp(ep->sig, "EPPS", 4)) {
		pr_debug("The signature is invalid.\n");
		goto ext_out;
	}

	/* find the ECC section. */
	cursor = (uint8_t *)(ep + 1);
	for (i = 0; i < ONFI_EXT_SECTION_MAX; i++) {
		s = ep->sections + i;
		if (s->type == ONFI_SECTION_TYPE_2)
			break;
		cursor += s->length * 16;
	}
	if (i == ONFI_EXT_SECTION_MAX) {
		pr_debug("We can not find the ECC section.\n");
		goto ext_out;
	}

	/* get the info we want. */
	ecc = (struct onfi_ext_ecc_info *)cursor;

	if (!ecc->codeword_size) {
		pr_debug("Invalid codeword size\n");
		goto ext_out;
	}

	requirements.strength = ecc->ecc_bits;
	requirements.step_size = 1 << ecc->codeword_size;
	nanddev_set_ecc_requirements(base, &requirements);

	ret = 0;

ext_out:
	kfree(ep);
	return ret;
}

/*
 * Recover data with bit-wise majority
 */
static void nand_bit_wise_majority(const void **srcbufs,
				   unsigned int nsrcbufs,
				   void *dstbuf,
				   unsigned int bufsize)
{
	int i, j, k;

	for (i = 0; i < bufsize; i++) {
		u8 val = 0;

		for (j = 0; j < 8; j++) {
			unsigned int cnt = 0;

			for (k = 0; k < nsrcbufs; k++) {
				const u8 *srcbuf = srcbufs[k];

				if (srcbuf[i] & BIT(j))
					cnt++;
			}

			if (cnt > nsrcbufs / 2)
				val |= BIT(j);
		}

		((u8 *)dstbuf)[i] = val;
	}
}

/*
 * Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise.
 */
int nand_onfi_detect(struct nand_chip *chip)
{
	struct nand_device *base = &chip->base;
	struct mtd_info *mtd = nand_to_mtd(chip);
	struct nand_memory_organization *memorg;
	struct nand_onfi_params *p = NULL, *pbuf;
	struct onfi_params *onfi;
	bool use_datain = false;
	int onfi_version = 0;
	char id[4];
	int i, ret, val;
	u16 crc;

	memorg = nanddev_get_memorg(&chip->base);

	/* Try ONFI for unknown chip or LP */
	ret = nand_readid_op(chip, 0x20, id, sizeof(id));
	if (ret || strncmp(id, "ONFI", 4))
		return 0;

	/* ONFI chip: allocate a buffer to hold its parameter page */
	pbuf = kzalloc((sizeof(*pbuf) * ONFI_PARAM_PAGES), GFP_KERNEL);
	if (!pbuf)
		return -ENOMEM;

	if (!nand_has_exec_op(chip) ||
	    !nand_read_data_op(chip, &pbuf[0], sizeof(*pbuf), true, true))
		use_datain = true;

	for (i = 0; i < ONFI_PARAM_PAGES; i++) {
		if (!i)
			ret = nand_read_param_page_op(chip, 0, &pbuf[i],
						      sizeof(*pbuf));
		else if (use_datain)
			ret = nand_read_data_op(chip, &pbuf[i], sizeof(*pbuf),
						true, false);
		else
			ret = nand_change_read_column_op(chip, sizeof(*pbuf) * i,
							 &pbuf[i], sizeof(*pbuf),
							 true);
		if (ret) {
			ret = 0;
			goto free_onfi_param_page;
		}

		crc = onfi_crc16(ONFI_CRC_BASE, (u8 *)&pbuf[i], 254);
		if (crc == le16_to_cpu(pbuf[i].crc)) {
			p = &pbuf[i];
			break;
		}
	}

	if (i == ONFI_PARAM_PAGES) {
		const void *srcbufs[ONFI_PARAM_PAGES];
		unsigned int j;

		for (j = 0; j < ONFI_PARAM_PAGES; j++)
			srcbufs[j] = pbuf + j;

		pr_warn("Could not find a valid ONFI parameter page, trying bit-wise majority to recover it\n");
		nand_bit_wise_majority(srcbufs, ONFI_PARAM_PAGES, pbuf,
				       sizeof(*pbuf));

		crc = onfi_crc16(ONFI_CRC_BASE, (u8 *)pbuf, 254);
		if (crc != le16_to_cpu(pbuf->crc)) {
			pr_err("ONFI parameter recovery failed, aborting\n");
			goto free_onfi_param_page;
		}
		p = pbuf;
	}

	if (chip->manufacturer.desc && chip->manufacturer.desc->ops &&
	    chip->manufacturer.desc->ops->fixup_onfi_param_page)
		chip->manufacturer.desc->ops->fixup_onfi_param_page(chip, p);

	/* Check version */
	val = le16_to_cpu(p->revision);
	if (val & ONFI_VERSION_2_3)
		onfi_version = 23;
	else if (val & ONFI_VERSION_2_2)
		onfi_version = 22;
	else if (val & ONFI_VERSION_2_1)
		onfi_version = 21;
	else if (val & ONFI_VERSION_2_0)
		onfi_version = 20;
	else if (val & ONFI_VERSION_1_0)
		onfi_version = 10;

	if (!onfi_version) {
		pr_info("unsupported ONFI version: %d\n", val);
		goto free_onfi_param_page;
	}

	sanitize_string(p->manufacturer, sizeof(p->manufacturer));
	sanitize_string(p->model, sizeof(p->model));
	chip->parameters.model = kstrdup(p->model, GFP_KERNEL);
	if (!chip->parameters.model) {
		ret = -ENOMEM;
		goto free_onfi_param_page;
	}

	memorg->pagesize = le32_to_cpu(p->byte_per_page);
	mtd->writesize = memorg->pagesize;

	/*
	 * pages_per_block and blocks_per_lun may not be a power-of-2 size
	 * (don't ask me who thought of this...). MTD assumes that these
	 * dimensions will be power-of-2, so just truncate the remaining area.
	 */
	memorg->pages_per_eraseblock =
			1 << (fls(le32_to_cpu(p->pages_per_block)) - 1);
	mtd->erasesize = memorg->pages_per_eraseblock * memorg->pagesize;

	memorg->oobsize = le16_to_cpu(p->spare_bytes_per_page);
	mtd->oobsize = memorg->oobsize;

	memorg->luns_per_target = p->lun_count;
	memorg->planes_per_lun = 1 << p->interleaved_bits;

	/* See erasesize comment */
	memorg->eraseblocks_per_lun =
		1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1);
	memorg->max_bad_eraseblocks_per_lun = le32_to_cpu(p->blocks_per_lun);
	memorg->bits_per_cell = p->bits_per_cell;

	if (le16_to_cpu(p->features) & ONFI_FEATURE_16_BIT_BUS)
		chip->options |= NAND_BUSWIDTH_16;

	if (p->ecc_bits != 0xff) {
		struct nand_ecc_props requirements = {
			.strength = p->ecc_bits,
			.step_size = 512,
		};

		nanddev_set_ecc_requirements(base, &requirements);
	} else if (onfi_version >= 21 &&
		(le16_to_cpu(p->features) & ONFI_FEATURE_EXT_PARAM_PAGE)) {

		/*
		 * The nand_flash_detect_ext_param_page() uses the
		 * Change Read Column command which maybe not supported
		 * by the chip->legacy.cmdfunc. So try to update the
		 * chip->legacy.cmdfunc now. We do not replace user supplied
		 * command function.
		 */
		nand_legacy_adjust_cmdfunc(chip);

		/* The Extended Parameter Page is supported since ONFI 2.1. */
		if (nand_flash_detect_ext_param_page(chip, p))
			pr_warn("Failed to detect ONFI extended param page\n");
	} else {
		pr_warn("Could not retrieve ONFI ECC requirements\n");
	}

	/* Save some parameters from the parameter page for future use */
	if (le16_to_cpu(p->opt_cmd) & ONFI_OPT_CMD_SET_GET_FEATURES) {
		chip->parameters.supports_set_get_features = true;
		bitmap_set(chip->parameters.get_feature_list,
			   ONFI_FEATURE_ADDR_TIMING_MODE, 1);
		bitmap_set(chip->parameters.set_feature_list,
			   ONFI_FEATURE_ADDR_TIMING_MODE, 1);
	}

	onfi = kzalloc(sizeof(*onfi), GFP_KERNEL);
	if (!onfi) {
		ret = -ENOMEM;
		goto free_model;
	}

	onfi->version = onfi_version;
	onfi->tPROG = le16_to_cpu(p->t_prog);
	onfi->tBERS = le16_to_cpu(p->t_bers);
	onfi->tR = le16_to_cpu(p->t_r);
	onfi->tCCS = le16_to_cpu(p->t_ccs);
	onfi->fast_tCAD = le16_to_cpu(p->nvddr_nvddr2_features) & BIT(0);
	onfi->sdr_timing_modes = le16_to_cpu(p->sdr_timing_modes);
	if (le16_to_cpu(p->features) & ONFI_FEATURE_NV_DDR)
		onfi->nvddr_timing_modes = le16_to_cpu(p->nvddr_timing_modes);
	onfi->vendor_revision = le16_to_cpu(p->vendor_revision);
	memcpy(onfi->vendor, p->vendor, sizeof(p->vendor));
	chip->parameters.onfi = onfi;

	/* Identification done, free the full ONFI parameter page and exit */
	kfree(pbuf);

	return 1;

free_model:
	kfree(chip->parameters.model);
free_onfi_param_page:
	kfree(pbuf);

	return ret;
}