Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/mtd/nand.c | |
3 | * | |
4 | * Overview: | |
5 | * This is the generic MTD driver for NAND flash devices. It should be | |
6 | * capable of working with almost all NAND chips currently available. | |
7 | * Basic support for AG-AND chips is provided. | |
61b03bd7 | 8 | * |
1da177e4 LT |
9 | * Additional technical information is available on |
10 | * http://www.linux-mtd.infradead.org/tech/nand.html | |
61b03bd7 | 11 | * |
1da177e4 | 12 | * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) |
2c0a2bed | 13 | * 2002 Thomas Gleixner (tglx@linutronix.de) |
1da177e4 | 14 | * |
61b03bd7 | 15 | * 02-08-2004 tglx: support for strange chips, which cannot auto increment |
1da177e4 LT |
16 | * pages on read / read_oob |
17 | * | |
18 | * 03-17-2004 tglx: Check ready before auto increment check. Simon Bayes | |
19 | * pointed this out, as he marked an auto increment capable chip | |
20 | * as NOAUTOINCR in the board driver. | |
21 | * Make reads over block boundaries work too | |
22 | * | |
23 | * 04-14-2004 tglx: first working version for 2k page size chips | |
61b03bd7 | 24 | * |
1da177e4 LT |
25 | * 05-19-2004 tglx: Basic support for Renesas AG-AND chips |
26 | * | |
27 | * 09-24-2004 tglx: add support for hardware controllers (e.g. ECC) shared | |
2c0a2bed TG |
28 | * among multiple independend devices. Suggestions and initial |
29 | * patch from Ben Dooks <ben-mtd@fluff.org> | |
30 | * | |
31 | * 12-05-2004 dmarlin: add workaround for Renesas AG-AND chips "disturb" | |
32 | * issue. Basically, any block not rewritten may lose data when | |
33 | * surrounding blocks are rewritten many times. JFFS2 ensures | |
34 | * this doesn't happen for blocks it uses, but the Bad Block | |
35 | * Table(s) may not be rewritten. To ensure they do not lose | |
36 | * data, force them to be rewritten when some of the surrounding | |
37 | * blocks are erased. Rather than tracking a specific nearby | |
38 | * block (which could itself go bad), use a page address 'mask' to | |
39 | * select several blocks in the same area, and rewrite the BBT | |
40 | * when any of them are erased. | |
41 | * | |
42 | * 01-03-2005 dmarlin: added support for the device recovery command sequence | |
43 | * for Renesas AG-AND chips. If there was a sudden loss of power | |
44 | * during an erase operation, a "device recovery" operation must | |
45 | * be performed when power is restored to ensure correct | |
46 | * operation. | |
47 | * | |
48 | * 01-20-2005 dmarlin: added support for optional hardware specific callback | |
49 | * routine to perform extra error status checks on erase and write | |
50 | * failures. This required adding a wrapper function for | |
51 | * nand_read_ecc. | |
068e3c0a | 52 | * |
962034f4 VW |
53 | * 08-20-2005 vwool: suspend/resume added |
54 | * | |
1da177e4 | 55 | * Credits: |
61b03bd7 TG |
56 | * David Woodhouse for adding multichip support |
57 | * | |
1da177e4 LT |
58 | * Aleph One Ltd. and Toby Churchill Ltd. for supporting the |
59 | * rework for 2K page size chips | |
60 | * | |
61 | * TODO: | |
62 | * Enable cached programming for 2k page size chips | |
63 | * Check, if mtd->ecctype should be set to MTD_ECC_HW | |
64 | * if we have HW ecc support. | |
65 | * The AG-AND chips have nice features for speed improvement, | |
66 | * which are not supported yet. Read / program 4 pages in one go. | |
67 | * | |
962034f4 | 68 | * $Id: nand_base.c,v 1.150 2005/09/15 13:58:48 vwool Exp $ |
1da177e4 LT |
69 | * |
70 | * This program is free software; you can redistribute it and/or modify | |
71 | * it under the terms of the GNU General Public License version 2 as | |
72 | * published by the Free Software Foundation. | |
73 | * | |
74 | */ | |
75 | ||
552d9205 | 76 | #include <linux/module.h> |
1da177e4 LT |
77 | #include <linux/delay.h> |
78 | #include <linux/errno.h> | |
79 | #include <linux/sched.h> | |
80 | #include <linux/slab.h> | |
81 | #include <linux/types.h> | |
82 | #include <linux/mtd/mtd.h> | |
83 | #include <linux/mtd/nand.h> | |
84 | #include <linux/mtd/nand_ecc.h> | |
85 | #include <linux/mtd/compatmac.h> | |
86 | #include <linux/interrupt.h> | |
87 | #include <linux/bitops.h> | |
8fe833c1 | 88 | #include <linux/leds.h> |
1da177e4 LT |
89 | #include <asm/io.h> |
90 | ||
91 | #ifdef CONFIG_MTD_PARTITIONS | |
92 | #include <linux/mtd/partitions.h> | |
93 | #endif | |
94 | ||
95 | /* Define default oob placement schemes for large and small page devices */ | |
96 | static struct nand_oobinfo nand_oob_8 = { | |
97 | .useecc = MTD_NANDECC_AUTOPLACE, | |
98 | .eccbytes = 3, | |
99 | .eccpos = {0, 1, 2}, | |
e0c7d767 | 100 | .oobfree = {{3, 2}, {6, 2}} |
1da177e4 LT |
101 | }; |
102 | ||
103 | static struct nand_oobinfo nand_oob_16 = { | |
104 | .useecc = MTD_NANDECC_AUTOPLACE, | |
105 | .eccbytes = 6, | |
106 | .eccpos = {0, 1, 2, 3, 6, 7}, | |
e0c7d767 | 107 | .oobfree = {{8, 8}} |
1da177e4 LT |
108 | }; |
109 | ||
110 | static struct nand_oobinfo nand_oob_64 = { | |
111 | .useecc = MTD_NANDECC_AUTOPLACE, | |
112 | .eccbytes = 24, | |
113 | .eccpos = { | |
e0c7d767 DW |
114 | 40, 41, 42, 43, 44, 45, 46, 47, |
115 | 48, 49, 50, 51, 52, 53, 54, 55, | |
116 | 56, 57, 58, 59, 60, 61, 62, 63}, | |
117 | .oobfree = {{2, 38}} | |
1da177e4 LT |
118 | }; |
119 | ||
120 | /* This is used for padding purposes in nand_write_oob */ | |
58dd8f2b | 121 | static uint8_t ffchars[] = { |
1da177e4 LT |
122 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
123 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
124 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
125 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
126 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
127 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
128 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
129 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
130 | }; | |
131 | ||
132 | /* | |
133 | * NAND low-level MTD interface functions | |
134 | */ | |
58dd8f2b TG |
135 | static void nand_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len); |
136 | static void nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len); | |
137 | static int nand_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len); | |
1da177e4 | 138 | |
2c0a2bed | 139 | static int nand_read(struct mtd_info *mtd, loff_t from, size_t len, |
58dd8f2b | 140 | size_t *retlen, uint8_t *buf); |
e0c7d767 | 141 | static int nand_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, |
58dd8f2b | 142 | size_t *retlen, uint8_t *buf, uint8_t *eccbuf, |
2c0a2bed TG |
143 | struct nand_oobinfo *oobsel); |
144 | static int nand_read_oob(struct mtd_info *mtd, loff_t from, size_t len, | |
58dd8f2b | 145 | size_t *retlen, uint8_t *buf); |
2c0a2bed | 146 | static int nand_write(struct mtd_info *mtd, loff_t to, size_t len, |
58dd8f2b | 147 | size_t *retlen, const uint8_t *buf); |
e0c7d767 | 148 | static int nand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len, |
58dd8f2b | 149 | size_t *retlen, const uint8_t *buf, uint8_t *eccbuf, |
2c0a2bed TG |
150 | struct nand_oobinfo *oobsel); |
151 | static int nand_write_oob(struct mtd_info *mtd, loff_t to, size_t len, | |
58dd8f2b | 152 | size_t *retlen, const uint8_t *buf); |
2c0a2bed TG |
153 | static int nand_writev(struct mtd_info *mtd, const struct kvec *vecs, |
154 | unsigned long count, loff_t to, size_t *retlen); | |
e0c7d767 | 155 | static int nand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs, |
2c0a2bed | 156 | unsigned long count, loff_t to, size_t *retlen, |
58dd8f2b | 157 | uint8_t *eccbuf, struct nand_oobinfo *oobsel); |
e0c7d767 DW |
158 | static int nand_erase(struct mtd_info *mtd, struct erase_info *instr); |
159 | static void nand_sync(struct mtd_info *mtd); | |
1da177e4 LT |
160 | |
161 | /* Some internal functions */ | |
2c0a2bed | 162 | static int nand_write_page(struct mtd_info *mtd, struct nand_chip *this, |
58dd8f2b | 163 | int page, uint8_t * oob_buf, |
e0c7d767 | 164 | struct nand_oobinfo *oobsel, int mode); |
1da177e4 | 165 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE |
2c0a2bed | 166 | static int nand_verify_pages(struct mtd_info *mtd, struct nand_chip *this, |
58dd8f2b | 167 | int page, int numpages, uint8_t *oob_buf, |
2c0a2bed TG |
168 | struct nand_oobinfo *oobsel, int chipnr, |
169 | int oobmode); | |
1da177e4 LT |
170 | #else |
171 | #define nand_verify_pages(...) (0) | |
172 | #endif | |
61b03bd7 | 173 | |
2c0a2bed TG |
174 | static int nand_get_device(struct nand_chip *this, struct mtd_info *mtd, |
175 | int new_state); | |
1da177e4 LT |
176 | |
177 | /** | |
178 | * nand_release_device - [GENERIC] release chip | |
179 | * @mtd: MTD device structure | |
61b03bd7 TG |
180 | * |
181 | * Deselect, release chip lock and wake up anyone waiting on the device | |
1da177e4 | 182 | */ |
e0c7d767 | 183 | static void nand_release_device(struct mtd_info *mtd) |
1da177e4 LT |
184 | { |
185 | struct nand_chip *this = mtd->priv; | |
186 | ||
187 | /* De-select the NAND device */ | |
188 | this->select_chip(mtd, -1); | |
0dfc6246 | 189 | |
a36ed299 TG |
190 | /* Release the controller and the chip */ |
191 | spin_lock(&this->controller->lock); | |
192 | this->controller->active = NULL; | |
193 | this->state = FL_READY; | |
194 | wake_up(&this->controller->wq); | |
195 | spin_unlock(&this->controller->lock); | |
1da177e4 LT |
196 | } |
197 | ||
198 | /** | |
199 | * nand_read_byte - [DEFAULT] read one byte from the chip | |
200 | * @mtd: MTD device structure | |
201 | * | |
202 | * Default read function for 8bit buswith | |
203 | */ | |
58dd8f2b | 204 | static uint8_t nand_read_byte(struct mtd_info *mtd) |
1da177e4 LT |
205 | { |
206 | struct nand_chip *this = mtd->priv; | |
207 | return readb(this->IO_ADDR_R); | |
208 | } | |
209 | ||
210 | /** | |
211 | * nand_write_byte - [DEFAULT] write one byte to the chip | |
212 | * @mtd: MTD device structure | |
213 | * @byte: pointer to data byte to write | |
214 | * | |
215 | * Default write function for 8it buswith | |
216 | */ | |
58dd8f2b | 217 | static void nand_write_byte(struct mtd_info *mtd, uint8_t byte) |
1da177e4 LT |
218 | { |
219 | struct nand_chip *this = mtd->priv; | |
220 | writeb(byte, this->IO_ADDR_W); | |
221 | } | |
222 | ||
223 | /** | |
224 | * nand_read_byte16 - [DEFAULT] read one byte endianess aware from the chip | |
225 | * @mtd: MTD device structure | |
226 | * | |
61b03bd7 | 227 | * Default read function for 16bit buswith with |
1da177e4 LT |
228 | * endianess conversion |
229 | */ | |
58dd8f2b | 230 | static uint8_t nand_read_byte16(struct mtd_info *mtd) |
1da177e4 LT |
231 | { |
232 | struct nand_chip *this = mtd->priv; | |
58dd8f2b | 233 | return (uint8_t) cpu_to_le16(readw(this->IO_ADDR_R)); |
1da177e4 LT |
234 | } |
235 | ||
236 | /** | |
237 | * nand_write_byte16 - [DEFAULT] write one byte endianess aware to the chip | |
238 | * @mtd: MTD device structure | |
239 | * @byte: pointer to data byte to write | |
240 | * | |
241 | * Default write function for 16bit buswith with | |
242 | * endianess conversion | |
243 | */ | |
58dd8f2b | 244 | static void nand_write_byte16(struct mtd_info *mtd, uint8_t byte) |
1da177e4 LT |
245 | { |
246 | struct nand_chip *this = mtd->priv; | |
247 | writew(le16_to_cpu((u16) byte), this->IO_ADDR_W); | |
248 | } | |
249 | ||
250 | /** | |
251 | * nand_read_word - [DEFAULT] read one word from the chip | |
252 | * @mtd: MTD device structure | |
253 | * | |
61b03bd7 | 254 | * Default read function for 16bit buswith without |
1da177e4 LT |
255 | * endianess conversion |
256 | */ | |
257 | static u16 nand_read_word(struct mtd_info *mtd) | |
258 | { | |
259 | struct nand_chip *this = mtd->priv; | |
260 | return readw(this->IO_ADDR_R); | |
261 | } | |
262 | ||
263 | /** | |
264 | * nand_write_word - [DEFAULT] write one word to the chip | |
265 | * @mtd: MTD device structure | |
266 | * @word: data word to write | |
267 | * | |
61b03bd7 | 268 | * Default write function for 16bit buswith without |
1da177e4 LT |
269 | * endianess conversion |
270 | */ | |
271 | static void nand_write_word(struct mtd_info *mtd, u16 word) | |
272 | { | |
273 | struct nand_chip *this = mtd->priv; | |
274 | writew(word, this->IO_ADDR_W); | |
275 | } | |
276 | ||
277 | /** | |
278 | * nand_select_chip - [DEFAULT] control CE line | |
279 | * @mtd: MTD device structure | |
280 | * @chip: chipnumber to select, -1 for deselect | |
281 | * | |
282 | * Default select function for 1 chip devices. | |
283 | */ | |
284 | static void nand_select_chip(struct mtd_info *mtd, int chip) | |
285 | { | |
286 | struct nand_chip *this = mtd->priv; | |
e0c7d767 | 287 | switch (chip) { |
1da177e4 | 288 | case -1: |
61b03bd7 | 289 | this->hwcontrol(mtd, NAND_CTL_CLRNCE); |
1da177e4 LT |
290 | break; |
291 | case 0: | |
292 | this->hwcontrol(mtd, NAND_CTL_SETNCE); | |
293 | break; | |
294 | ||
295 | default: | |
296 | BUG(); | |
297 | } | |
298 | } | |
299 | ||
300 | /** | |
301 | * nand_write_buf - [DEFAULT] write buffer to chip | |
302 | * @mtd: MTD device structure | |
303 | * @buf: data buffer | |
304 | * @len: number of bytes to write | |
305 | * | |
306 | * Default write function for 8bit buswith | |
307 | */ | |
58dd8f2b | 308 | static void nand_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len) |
1da177e4 LT |
309 | { |
310 | int i; | |
311 | struct nand_chip *this = mtd->priv; | |
312 | ||
e0c7d767 | 313 | for (i = 0; i < len; i++) |
1da177e4 LT |
314 | writeb(buf[i], this->IO_ADDR_W); |
315 | } | |
316 | ||
317 | /** | |
61b03bd7 | 318 | * nand_read_buf - [DEFAULT] read chip data into buffer |
1da177e4 LT |
319 | * @mtd: MTD device structure |
320 | * @buf: buffer to store date | |
321 | * @len: number of bytes to read | |
322 | * | |
323 | * Default read function for 8bit buswith | |
324 | */ | |
58dd8f2b | 325 | static void nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) |
1da177e4 LT |
326 | { |
327 | int i; | |
328 | struct nand_chip *this = mtd->priv; | |
329 | ||
e0c7d767 | 330 | for (i = 0; i < len; i++) |
1da177e4 LT |
331 | buf[i] = readb(this->IO_ADDR_R); |
332 | } | |
333 | ||
334 | /** | |
61b03bd7 | 335 | * nand_verify_buf - [DEFAULT] Verify chip data against buffer |
1da177e4 LT |
336 | * @mtd: MTD device structure |
337 | * @buf: buffer containing the data to compare | |
338 | * @len: number of bytes to compare | |
339 | * | |
340 | * Default verify function for 8bit buswith | |
341 | */ | |
58dd8f2b | 342 | static int nand_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len) |
1da177e4 LT |
343 | { |
344 | int i; | |
345 | struct nand_chip *this = mtd->priv; | |
346 | ||
e0c7d767 | 347 | for (i = 0; i < len; i++) |
1da177e4 LT |
348 | if (buf[i] != readb(this->IO_ADDR_R)) |
349 | return -EFAULT; | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | /** | |
355 | * nand_write_buf16 - [DEFAULT] write buffer to chip | |
356 | * @mtd: MTD device structure | |
357 | * @buf: data buffer | |
358 | * @len: number of bytes to write | |
359 | * | |
360 | * Default write function for 16bit buswith | |
361 | */ | |
58dd8f2b | 362 | static void nand_write_buf16(struct mtd_info *mtd, const uint8_t *buf, int len) |
1da177e4 LT |
363 | { |
364 | int i; | |
365 | struct nand_chip *this = mtd->priv; | |
366 | u16 *p = (u16 *) buf; | |
367 | len >>= 1; | |
61b03bd7 | 368 | |
e0c7d767 | 369 | for (i = 0; i < len; i++) |
1da177e4 | 370 | writew(p[i], this->IO_ADDR_W); |
61b03bd7 | 371 | |
1da177e4 LT |
372 | } |
373 | ||
374 | /** | |
61b03bd7 | 375 | * nand_read_buf16 - [DEFAULT] read chip data into buffer |
1da177e4 LT |
376 | * @mtd: MTD device structure |
377 | * @buf: buffer to store date | |
378 | * @len: number of bytes to read | |
379 | * | |
380 | * Default read function for 16bit buswith | |
381 | */ | |
58dd8f2b | 382 | static void nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len) |
1da177e4 LT |
383 | { |
384 | int i; | |
385 | struct nand_chip *this = mtd->priv; | |
386 | u16 *p = (u16 *) buf; | |
387 | len >>= 1; | |
388 | ||
e0c7d767 | 389 | for (i = 0; i < len; i++) |
1da177e4 LT |
390 | p[i] = readw(this->IO_ADDR_R); |
391 | } | |
392 | ||
393 | /** | |
61b03bd7 | 394 | * nand_verify_buf16 - [DEFAULT] Verify chip data against buffer |
1da177e4 LT |
395 | * @mtd: MTD device structure |
396 | * @buf: buffer containing the data to compare | |
397 | * @len: number of bytes to compare | |
398 | * | |
399 | * Default verify function for 16bit buswith | |
400 | */ | |
58dd8f2b | 401 | static int nand_verify_buf16(struct mtd_info *mtd, const uint8_t *buf, int len) |
1da177e4 LT |
402 | { |
403 | int i; | |
404 | struct nand_chip *this = mtd->priv; | |
405 | u16 *p = (u16 *) buf; | |
406 | len >>= 1; | |
407 | ||
e0c7d767 | 408 | for (i = 0; i < len; i++) |
1da177e4 LT |
409 | if (p[i] != readw(this->IO_ADDR_R)) |
410 | return -EFAULT; | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | /** | |
416 | * nand_block_bad - [DEFAULT] Read bad block marker from the chip | |
417 | * @mtd: MTD device structure | |
418 | * @ofs: offset from device start | |
419 | * @getchip: 0, if the chip is already selected | |
420 | * | |
61b03bd7 | 421 | * Check, if the block is bad. |
1da177e4 LT |
422 | */ |
423 | static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip) | |
424 | { | |
425 | int page, chipnr, res = 0; | |
426 | struct nand_chip *this = mtd->priv; | |
427 | u16 bad; | |
428 | ||
429 | if (getchip) { | |
430 | page = (int)(ofs >> this->page_shift); | |
431 | chipnr = (int)(ofs >> this->chip_shift); | |
432 | ||
433 | /* Grab the lock and see if the device is available */ | |
e0c7d767 | 434 | nand_get_device(this, mtd, FL_READING); |
1da177e4 LT |
435 | |
436 | /* Select the NAND device */ | |
437 | this->select_chip(mtd, chipnr); | |
61b03bd7 | 438 | } else |
e0c7d767 | 439 | page = (int)ofs; |
1da177e4 LT |
440 | |
441 | if (this->options & NAND_BUSWIDTH_16) { | |
2c0a2bed TG |
442 | this->cmdfunc(mtd, NAND_CMD_READOOB, this->badblockpos & 0xFE, |
443 | page & this->pagemask); | |
1da177e4 LT |
444 | bad = cpu_to_le16(this->read_word(mtd)); |
445 | if (this->badblockpos & 0x1) | |
49196f33 | 446 | bad >>= 8; |
1da177e4 LT |
447 | if ((bad & 0xFF) != 0xff) |
448 | res = 1; | |
449 | } else { | |
2c0a2bed TG |
450 | this->cmdfunc(mtd, NAND_CMD_READOOB, this->badblockpos, |
451 | page & this->pagemask); | |
1da177e4 LT |
452 | if (this->read_byte(mtd) != 0xff) |
453 | res = 1; | |
454 | } | |
61b03bd7 | 455 | |
1da177e4 LT |
456 | if (getchip) { |
457 | /* Deselect and wake up anyone waiting on the device */ | |
458 | nand_release_device(mtd); | |
61b03bd7 TG |
459 | } |
460 | ||
1da177e4 LT |
461 | return res; |
462 | } | |
463 | ||
464 | /** | |
465 | * nand_default_block_markbad - [DEFAULT] mark a block bad | |
466 | * @mtd: MTD device structure | |
467 | * @ofs: offset from device start | |
468 | * | |
469 | * This is the default implementation, which can be overridden by | |
470 | * a hardware specific driver. | |
471 | */ | |
472 | static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
473 | { | |
474 | struct nand_chip *this = mtd->priv; | |
58dd8f2b | 475 | uint8_t buf[2] = { 0, 0 }; |
e0c7d767 | 476 | size_t retlen; |
1da177e4 | 477 | int block; |
61b03bd7 | 478 | |
1da177e4 | 479 | /* Get block number */ |
e0c7d767 | 480 | block = ((int)ofs) >> this->bbt_erase_shift; |
41ce9214 AB |
481 | if (this->bbt) |
482 | this->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1); | |
1da177e4 LT |
483 | |
484 | /* Do we have a flash based bad block table ? */ | |
485 | if (this->options & NAND_USE_FLASH_BBT) | |
e0c7d767 | 486 | return nand_update_bbt(mtd, ofs); |
61b03bd7 | 487 | |
1da177e4 LT |
488 | /* We write two bytes, so we dont have to mess with 16 bit access */ |
489 | ofs += mtd->oobsize + (this->badblockpos & ~0x01); | |
e0c7d767 | 490 | return nand_write_oob(mtd, ofs, 2, &retlen, buf); |
1da177e4 LT |
491 | } |
492 | ||
61b03bd7 | 493 | /** |
1da177e4 LT |
494 | * nand_check_wp - [GENERIC] check if the chip is write protected |
495 | * @mtd: MTD device structure | |
61b03bd7 | 496 | * Check, if the device is write protected |
1da177e4 | 497 | * |
61b03bd7 | 498 | * The function expects, that the device is already selected |
1da177e4 | 499 | */ |
e0c7d767 | 500 | static int nand_check_wp(struct mtd_info *mtd) |
1da177e4 LT |
501 | { |
502 | struct nand_chip *this = mtd->priv; | |
503 | /* Check the WP bit */ | |
e0c7d767 | 504 | this->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1); |
61b03bd7 | 505 | return (this->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1; |
1da177e4 LT |
506 | } |
507 | ||
508 | /** | |
509 | * nand_block_checkbad - [GENERIC] Check if a block is marked bad | |
510 | * @mtd: MTD device structure | |
511 | * @ofs: offset from device start | |
512 | * @getchip: 0, if the chip is already selected | |
513 | * @allowbbt: 1, if its allowed to access the bbt area | |
514 | * | |
515 | * Check, if the block is bad. Either by reading the bad block table or | |
516 | * calling of the scan function. | |
517 | */ | |
2c0a2bed TG |
518 | static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, |
519 | int allowbbt) | |
1da177e4 LT |
520 | { |
521 | struct nand_chip *this = mtd->priv; | |
61b03bd7 | 522 | |
1da177e4 LT |
523 | if (!this->bbt) |
524 | return this->block_bad(mtd, ofs, getchip); | |
61b03bd7 | 525 | |
1da177e4 | 526 | /* Return info from the table */ |
e0c7d767 | 527 | return nand_isbad_bbt(mtd, ofs, allowbbt); |
1da177e4 LT |
528 | } |
529 | ||
8fe833c1 RP |
530 | DEFINE_LED_TRIGGER(nand_led_trigger); |
531 | ||
61b03bd7 | 532 | /* |
3b88775c TG |
533 | * Wait for the ready pin, after a command |
534 | * The timeout is catched later. | |
535 | */ | |
536 | static void nand_wait_ready(struct mtd_info *mtd) | |
537 | { | |
538 | struct nand_chip *this = mtd->priv; | |
e0c7d767 | 539 | unsigned long timeo = jiffies + 2; |
3b88775c | 540 | |
8fe833c1 | 541 | led_trigger_event(nand_led_trigger, LED_FULL); |
3b88775c TG |
542 | /* wait until command is processed or timeout occures */ |
543 | do { | |
544 | if (this->dev_ready(mtd)) | |
8fe833c1 | 545 | break; |
8446f1d3 | 546 | touch_softlockup_watchdog(); |
61b03bd7 | 547 | } while (time_before(jiffies, timeo)); |
8fe833c1 | 548 | led_trigger_event(nand_led_trigger, LED_OFF); |
3b88775c TG |
549 | } |
550 | ||
1da177e4 LT |
551 | /** |
552 | * nand_command - [DEFAULT] Send command to NAND device | |
553 | * @mtd: MTD device structure | |
554 | * @command: the command to be sent | |
555 | * @column: the column address for this command, -1 if none | |
556 | * @page_addr: the page address for this command, -1 if none | |
557 | * | |
558 | * Send command to NAND device. This function is used for small page | |
559 | * devices (256/512 Bytes per page) | |
560 | */ | |
2c0a2bed TG |
561 | static void nand_command(struct mtd_info *mtd, unsigned command, int column, |
562 | int page_addr) | |
1da177e4 LT |
563 | { |
564 | register struct nand_chip *this = mtd->priv; | |
565 | ||
566 | /* Begin command latch cycle */ | |
567 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
568 | /* | |
569 | * Write out the command to the device. | |
570 | */ | |
571 | if (command == NAND_CMD_SEQIN) { | |
572 | int readcmd; | |
573 | ||
574 | if (column >= mtd->oobblock) { | |
575 | /* OOB area */ | |
576 | column -= mtd->oobblock; | |
577 | readcmd = NAND_CMD_READOOB; | |
578 | } else if (column < 256) { | |
579 | /* First 256 bytes --> READ0 */ | |
580 | readcmd = NAND_CMD_READ0; | |
581 | } else { | |
582 | column -= 256; | |
583 | readcmd = NAND_CMD_READ1; | |
584 | } | |
585 | this->write_byte(mtd, readcmd); | |
586 | } | |
587 | this->write_byte(mtd, command); | |
588 | ||
589 | /* Set ALE and clear CLE to start address cycle */ | |
590 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
591 | ||
592 | if (column != -1 || page_addr != -1) { | |
593 | this->hwcontrol(mtd, NAND_CTL_SETALE); | |
594 | ||
595 | /* Serially input address */ | |
596 | if (column != -1) { | |
597 | /* Adjust columns for 16 bit buswidth */ | |
598 | if (this->options & NAND_BUSWIDTH_16) | |
599 | column >>= 1; | |
600 | this->write_byte(mtd, column); | |
601 | } | |
602 | if (page_addr != -1) { | |
58dd8f2b TG |
603 | this->write_byte(mtd, (uint8_t)(page_addr & 0xff)); |
604 | this->write_byte(mtd, (uint8_t)((page_addr >> 8) & 0xff)); | |
1da177e4 LT |
605 | /* One more address cycle for devices > 32MiB */ |
606 | if (this->chipsize > (32 << 20)) | |
58dd8f2b | 607 | this->write_byte(mtd, (uint8_t)((page_addr >> 16) & 0x0f)); |
1da177e4 LT |
608 | } |
609 | /* Latch in address */ | |
610 | this->hwcontrol(mtd, NAND_CTL_CLRALE); | |
611 | } | |
61b03bd7 TG |
612 | |
613 | /* | |
614 | * program and erase have their own busy handlers | |
1da177e4 | 615 | * status and sequential in needs no delay |
e0c7d767 | 616 | */ |
1da177e4 | 617 | switch (command) { |
61b03bd7 | 618 | |
1da177e4 LT |
619 | case NAND_CMD_PAGEPROG: |
620 | case NAND_CMD_ERASE1: | |
621 | case NAND_CMD_ERASE2: | |
622 | case NAND_CMD_SEQIN: | |
623 | case NAND_CMD_STATUS: | |
624 | return; | |
625 | ||
626 | case NAND_CMD_RESET: | |
61b03bd7 | 627 | if (this->dev_ready) |
1da177e4 LT |
628 | break; |
629 | udelay(this->chip_delay); | |
630 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
631 | this->write_byte(mtd, NAND_CMD_STATUS); | |
632 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
e0c7d767 | 633 | while (!(this->read_byte(mtd) & NAND_STATUS_READY)) ; |
1da177e4 LT |
634 | return; |
635 | ||
e0c7d767 | 636 | /* This applies to read commands */ |
1da177e4 | 637 | default: |
61b03bd7 | 638 | /* |
1da177e4 LT |
639 | * If we don't have access to the busy pin, we apply the given |
640 | * command delay | |
e0c7d767 | 641 | */ |
1da177e4 | 642 | if (!this->dev_ready) { |
e0c7d767 | 643 | udelay(this->chip_delay); |
1da177e4 | 644 | return; |
61b03bd7 | 645 | } |
1da177e4 | 646 | } |
1da177e4 LT |
647 | /* Apply this short delay always to ensure that we do wait tWB in |
648 | * any case on any machine. */ | |
e0c7d767 | 649 | ndelay(100); |
3b88775c TG |
650 | |
651 | nand_wait_ready(mtd); | |
1da177e4 LT |
652 | } |
653 | ||
654 | /** | |
655 | * nand_command_lp - [DEFAULT] Send command to NAND large page device | |
656 | * @mtd: MTD device structure | |
657 | * @command: the command to be sent | |
658 | * @column: the column address for this command, -1 if none | |
659 | * @page_addr: the page address for this command, -1 if none | |
660 | * | |
661 | * Send command to NAND device. This is the version for the new large page devices | |
e0c7d767 | 662 | * We dont have the separate regions as we have in the small page devices. |
1da177e4 LT |
663 | * We must emulate NAND_CMD_READOOB to keep the code compatible. |
664 | * | |
665 | */ | |
e0c7d767 | 666 | static void nand_command_lp(struct mtd_info *mtd, unsigned command, int column, int page_addr) |
1da177e4 LT |
667 | { |
668 | register struct nand_chip *this = mtd->priv; | |
669 | ||
670 | /* Emulate NAND_CMD_READOOB */ | |
671 | if (command == NAND_CMD_READOOB) { | |
672 | column += mtd->oobblock; | |
673 | command = NAND_CMD_READ0; | |
674 | } | |
61b03bd7 | 675 | |
1da177e4 LT |
676 | /* Begin command latch cycle */ |
677 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
678 | /* Write out the command to the device. */ | |
30f464b7 | 679 | this->write_byte(mtd, (command & 0xff)); |
1da177e4 LT |
680 | /* End command latch cycle */ |
681 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
682 | ||
683 | if (column != -1 || page_addr != -1) { | |
684 | this->hwcontrol(mtd, NAND_CTL_SETALE); | |
685 | ||
686 | /* Serially input address */ | |
687 | if (column != -1) { | |
688 | /* Adjust columns for 16 bit buswidth */ | |
689 | if (this->options & NAND_BUSWIDTH_16) | |
690 | column >>= 1; | |
691 | this->write_byte(mtd, column & 0xff); | |
692 | this->write_byte(mtd, column >> 8); | |
61b03bd7 | 693 | } |
1da177e4 | 694 | if (page_addr != -1) { |
58dd8f2b TG |
695 | this->write_byte(mtd, (uint8_t)(page_addr & 0xff)); |
696 | this->write_byte(mtd, (uint8_t)((page_addr >> 8) & 0xff)); | |
1da177e4 LT |
697 | /* One more address cycle for devices > 128MiB */ |
698 | if (this->chipsize > (128 << 20)) | |
58dd8f2b | 699 | this->write_byte(mtd, (uint8_t)((page_addr >> 16) & 0xff)); |
1da177e4 LT |
700 | } |
701 | /* Latch in address */ | |
702 | this->hwcontrol(mtd, NAND_CTL_CLRALE); | |
703 | } | |
61b03bd7 TG |
704 | |
705 | /* | |
706 | * program and erase have their own busy handlers | |
30f464b7 DM |
707 | * status, sequential in, and deplete1 need no delay |
708 | */ | |
1da177e4 | 709 | switch (command) { |
61b03bd7 | 710 | |
1da177e4 LT |
711 | case NAND_CMD_CACHEDPROG: |
712 | case NAND_CMD_PAGEPROG: | |
713 | case NAND_CMD_ERASE1: | |
714 | case NAND_CMD_ERASE2: | |
715 | case NAND_CMD_SEQIN: | |
716 | case NAND_CMD_STATUS: | |
30f464b7 | 717 | case NAND_CMD_DEPLETE1: |
1da177e4 LT |
718 | return; |
719 | ||
e0c7d767 DW |
720 | /* |
721 | * read error status commands require only a short delay | |
722 | */ | |
30f464b7 DM |
723 | case NAND_CMD_STATUS_ERROR: |
724 | case NAND_CMD_STATUS_ERROR0: | |
725 | case NAND_CMD_STATUS_ERROR1: | |
726 | case NAND_CMD_STATUS_ERROR2: | |
727 | case NAND_CMD_STATUS_ERROR3: | |
728 | udelay(this->chip_delay); | |
729 | return; | |
1da177e4 LT |
730 | |
731 | case NAND_CMD_RESET: | |
61b03bd7 | 732 | if (this->dev_ready) |
1da177e4 LT |
733 | break; |
734 | udelay(this->chip_delay); | |
735 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
736 | this->write_byte(mtd, NAND_CMD_STATUS); | |
737 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
e0c7d767 | 738 | while (!(this->read_byte(mtd) & NAND_STATUS_READY)) ; |
1da177e4 LT |
739 | return; |
740 | ||
741 | case NAND_CMD_READ0: | |
742 | /* Begin command latch cycle */ | |
743 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
744 | /* Write out the start read command */ | |
745 | this->write_byte(mtd, NAND_CMD_READSTART); | |
746 | /* End command latch cycle */ | |
747 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
748 | /* Fall through into ready check */ | |
61b03bd7 | 749 | |
e0c7d767 | 750 | /* This applies to read commands */ |
1da177e4 | 751 | default: |
61b03bd7 | 752 | /* |
1da177e4 LT |
753 | * If we don't have access to the busy pin, we apply the given |
754 | * command delay | |
e0c7d767 | 755 | */ |
1da177e4 | 756 | if (!this->dev_ready) { |
e0c7d767 | 757 | udelay(this->chip_delay); |
1da177e4 | 758 | return; |
61b03bd7 | 759 | } |
1da177e4 | 760 | } |
3b88775c | 761 | |
1da177e4 LT |
762 | /* Apply this short delay always to ensure that we do wait tWB in |
763 | * any case on any machine. */ | |
e0c7d767 | 764 | ndelay(100); |
3b88775c TG |
765 | |
766 | nand_wait_ready(mtd); | |
1da177e4 LT |
767 | } |
768 | ||
769 | /** | |
770 | * nand_get_device - [GENERIC] Get chip for selected access | |
771 | * @this: the nand chip descriptor | |
772 | * @mtd: MTD device structure | |
61b03bd7 | 773 | * @new_state: the state which is requested |
1da177e4 LT |
774 | * |
775 | * Get the device and lock it for exclusive access | |
776 | */ | |
2c0a2bed TG |
777 | static int |
778 | nand_get_device(struct nand_chip *this, struct mtd_info *mtd, int new_state) | |
1da177e4 | 779 | { |
a36ed299 TG |
780 | spinlock_t *lock = &this->controller->lock; |
781 | wait_queue_head_t *wq = &this->controller->wq; | |
e0c7d767 | 782 | DECLARE_WAITQUEUE(wait, current); |
e0c7d767 | 783 | retry: |
0dfc6246 TG |
784 | spin_lock(lock); |
785 | ||
1da177e4 | 786 | /* Hardware controller shared among independend devices */ |
a36ed299 TG |
787 | /* Hardware controller shared among independend devices */ |
788 | if (!this->controller->active) | |
789 | this->controller->active = this; | |
790 | ||
791 | if (this->controller->active == this && this->state == FL_READY) { | |
0dfc6246 TG |
792 | this->state = new_state; |
793 | spin_unlock(lock); | |
962034f4 VW |
794 | return 0; |
795 | } | |
796 | if (new_state == FL_PM_SUSPENDED) { | |
797 | spin_unlock(lock); | |
798 | return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN; | |
0dfc6246 TG |
799 | } |
800 | set_current_state(TASK_UNINTERRUPTIBLE); | |
801 | add_wait_queue(wq, &wait); | |
802 | spin_unlock(lock); | |
803 | schedule(); | |
804 | remove_wait_queue(wq, &wait); | |
1da177e4 LT |
805 | goto retry; |
806 | } | |
807 | ||
808 | /** | |
809 | * nand_wait - [DEFAULT] wait until the command is done | |
810 | * @mtd: MTD device structure | |
811 | * @this: NAND chip structure | |
812 | * @state: state to select the max. timeout value | |
813 | * | |
814 | * Wait for command done. This applies to erase and program only | |
61b03bd7 | 815 | * Erase can take up to 400ms and program up to 20ms according to |
1da177e4 LT |
816 | * general NAND and SmartMedia specs |
817 | * | |
818 | */ | |
819 | static int nand_wait(struct mtd_info *mtd, struct nand_chip *this, int state) | |
820 | { | |
821 | ||
e0c7d767 DW |
822 | unsigned long timeo = jiffies; |
823 | int status; | |
61b03bd7 | 824 | |
1da177e4 | 825 | if (state == FL_ERASING) |
e0c7d767 | 826 | timeo += (HZ * 400) / 1000; |
1da177e4 | 827 | else |
e0c7d767 | 828 | timeo += (HZ * 20) / 1000; |
1da177e4 | 829 | |
8fe833c1 RP |
830 | led_trigger_event(nand_led_trigger, LED_FULL); |
831 | ||
1da177e4 LT |
832 | /* Apply this short delay always to ensure that we do wait tWB in |
833 | * any case on any machine. */ | |
e0c7d767 | 834 | ndelay(100); |
1da177e4 LT |
835 | |
836 | if ((state == FL_ERASING) && (this->options & NAND_IS_AND)) | |
e0c7d767 | 837 | this->cmdfunc(mtd, NAND_CMD_STATUS_MULTI, -1, -1); |
61b03bd7 | 838 | else |
e0c7d767 | 839 | this->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1); |
1da177e4 | 840 | |
61b03bd7 | 841 | while (time_before(jiffies, timeo)) { |
1da177e4 LT |
842 | /* Check, if we were interrupted */ |
843 | if (this->state != state) | |
844 | return 0; | |
845 | ||
846 | if (this->dev_ready) { | |
847 | if (this->dev_ready(mtd)) | |
61b03bd7 | 848 | break; |
1da177e4 LT |
849 | } else { |
850 | if (this->read_byte(mtd) & NAND_STATUS_READY) | |
851 | break; | |
852 | } | |
20a6c211 | 853 | cond_resched(); |
1da177e4 | 854 | } |
8fe833c1 RP |
855 | led_trigger_event(nand_led_trigger, LED_OFF); |
856 | ||
e0c7d767 | 857 | status = (int)this->read_byte(mtd); |
1da177e4 LT |
858 | return status; |
859 | } | |
860 | ||
861 | /** | |
862 | * nand_write_page - [GENERIC] write one page | |
863 | * @mtd: MTD device structure | |
864 | * @this: NAND chip structure | |
865 | * @page: startpage inside the chip, must be called with (page & this->pagemask) | |
866 | * @oob_buf: out of band data buffer | |
867 | * @oobsel: out of band selecttion structre | |
868 | * @cached: 1 = enable cached programming if supported by chip | |
869 | * | |
870 | * Nand_page_program function is used for write and writev ! | |
871 | * This function will always program a full page of data | |
872 | * If you call it with a non page aligned buffer, you're lost :) | |
873 | * | |
874 | * Cached programming is not supported yet. | |
875 | */ | |
e0c7d767 | 876 | static int nand_write_page(struct mtd_info *mtd, struct nand_chip *this, int page, |
58dd8f2b | 877 | uint8_t *oob_buf, struct nand_oobinfo *oobsel, int cached) |
1da177e4 | 878 | { |
e0c7d767 | 879 | int i, status; |
58dd8f2b | 880 | uint8_t ecc_code[32]; |
e0c7d767 DW |
881 | int eccmode = oobsel->useecc ? this->eccmode : NAND_ECC_NONE; |
882 | int *oob_config = oobsel->eccpos; | |
883 | int datidx = 0, eccidx = 0, eccsteps = this->eccsteps; | |
884 | int eccbytes = 0; | |
61b03bd7 | 885 | |
1da177e4 LT |
886 | /* FIXME: Enable cached programming */ |
887 | cached = 0; | |
61b03bd7 | 888 | |
1da177e4 | 889 | /* Send command to begin auto page programming */ |
e0c7d767 | 890 | this->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page); |
1da177e4 LT |
891 | |
892 | /* Write out complete page of data, take care of eccmode */ | |
893 | switch (eccmode) { | |
e0c7d767 | 894 | /* No ecc, write all */ |
1da177e4 | 895 | case NAND_ECC_NONE: |
e0c7d767 | 896 | printk(KERN_WARNING "Writing data without ECC to NAND-FLASH is not recommended\n"); |
1da177e4 LT |
897 | this->write_buf(mtd, this->data_poi, mtd->oobblock); |
898 | break; | |
61b03bd7 | 899 | |
e0c7d767 | 900 | /* Software ecc 3/256, write all */ |
1da177e4 LT |
901 | case NAND_ECC_SOFT: |
902 | for (; eccsteps; eccsteps--) { | |
903 | this->calculate_ecc(mtd, &this->data_poi[datidx], ecc_code); | |
904 | for (i = 0; i < 3; i++, eccidx++) | |
905 | oob_buf[oob_config[eccidx]] = ecc_code[i]; | |
906 | datidx += this->eccsize; | |
907 | } | |
908 | this->write_buf(mtd, this->data_poi, mtd->oobblock); | |
909 | break; | |
910 | default: | |
911 | eccbytes = this->eccbytes; | |
912 | for (; eccsteps; eccsteps--) { | |
913 | /* enable hardware ecc logic for write */ | |
914 | this->enable_hwecc(mtd, NAND_ECC_WRITE); | |
915 | this->write_buf(mtd, &this->data_poi[datidx], this->eccsize); | |
916 | this->calculate_ecc(mtd, &this->data_poi[datidx], ecc_code); | |
917 | for (i = 0; i < eccbytes; i++, eccidx++) | |
918 | oob_buf[oob_config[eccidx]] = ecc_code[i]; | |
919 | /* If the hardware ecc provides syndromes then | |
920 | * the ecc code must be written immidiately after | |
921 | * the data bytes (words) */ | |
922 | if (this->options & NAND_HWECC_SYNDROME) | |
923 | this->write_buf(mtd, ecc_code, eccbytes); | |
924 | datidx += this->eccsize; | |
925 | } | |
926 | break; | |
927 | } | |
61b03bd7 | 928 | |
1da177e4 LT |
929 | /* Write out OOB data */ |
930 | if (this->options & NAND_HWECC_SYNDROME) | |
931 | this->write_buf(mtd, &oob_buf[oobsel->eccbytes], mtd->oobsize - oobsel->eccbytes); | |
61b03bd7 | 932 | else |
1da177e4 LT |
933 | this->write_buf(mtd, oob_buf, mtd->oobsize); |
934 | ||
935 | /* Send command to actually program the data */ | |
e0c7d767 | 936 | this->cmdfunc(mtd, cached ? NAND_CMD_CACHEDPROG : NAND_CMD_PAGEPROG, -1, -1); |
1da177e4 LT |
937 | |
938 | if (!cached) { | |
939 | /* call wait ready function */ | |
e0c7d767 | 940 | status = this->waitfunc(mtd, this, FL_WRITING); |
068e3c0a DM |
941 | |
942 | /* See if operation failed and additional status checks are available */ | |
943 | if ((status & NAND_STATUS_FAIL) && (this->errstat)) { | |
944 | status = this->errstat(mtd, this, FL_WRITING, status, page); | |
945 | } | |
946 | ||
1da177e4 | 947 | /* See if device thinks it succeeded */ |
a4ab4c5d | 948 | if (status & NAND_STATUS_FAIL) { |
e0c7d767 | 949 | DEBUG(MTD_DEBUG_LEVEL0, "%s: " "Failed write, page 0x%08x, ", __FUNCTION__, page); |
1da177e4 LT |
950 | return -EIO; |
951 | } | |
952 | } else { | |
953 | /* FIXME: Implement cached programming ! */ | |
e0c7d767 | 954 | /* wait until cache is ready */ |
1da177e4 LT |
955 | // status = this->waitfunc (mtd, this, FL_CACHEDRPG); |
956 | } | |
61b03bd7 | 957 | return 0; |
1da177e4 LT |
958 | } |
959 | ||
960 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE | |
961 | /** | |
962 | * nand_verify_pages - [GENERIC] verify the chip contents after a write | |
963 | * @mtd: MTD device structure | |
964 | * @this: NAND chip structure | |
2c0a2bed | 965 | * @page: startpage inside the chip, must be called with (page & this->pagemask) |
1da177e4 LT |
966 | * @numpages: number of pages to verify |
967 | * @oob_buf: out of band data buffer | |
968 | * @oobsel: out of band selecttion structre | |
969 | * @chipnr: number of the current chip | |
970 | * @oobmode: 1 = full buffer verify, 0 = ecc only | |
971 | * | |
972 | * The NAND device assumes that it is always writing to a cleanly erased page. | |
61b03bd7 | 973 | * Hence, it performs its internal write verification only on bits that |
1da177e4 | 974 | * transitioned from 1 to 0. The device does NOT verify the whole page on a |
61b03bd7 TG |
975 | * byte by byte basis. It is possible that the page was not completely erased |
976 | * or the page is becoming unusable due to wear. The read with ECC would catch | |
977 | * the error later when the ECC page check fails, but we would rather catch | |
1da177e4 LT |
978 | * it early in the page write stage. Better to write no data than invalid data. |
979 | */ | |
e0c7d767 | 980 | static int nand_verify_pages(struct mtd_info *mtd, struct nand_chip *this, int page, int numpages, |
58dd8f2b | 981 | uint8_t *oob_buf, struct nand_oobinfo *oobsel, int chipnr, int oobmode) |
1da177e4 | 982 | { |
e0c7d767 DW |
983 | int i, j, datidx = 0, oobofs = 0, res = -EIO; |
984 | int eccsteps = this->eccsteps; | |
985 | int hweccbytes; | |
58dd8f2b | 986 | uint8_t oobdata[64]; |
1da177e4 LT |
987 | |
988 | hweccbytes = (this->options & NAND_HWECC_SYNDROME) ? (oobsel->eccbytes / eccsteps) : 0; | |
989 | ||
990 | /* Send command to read back the first page */ | |
e0c7d767 | 991 | this->cmdfunc(mtd, NAND_CMD_READ0, 0, page); |
1da177e4 | 992 | |
e0c7d767 | 993 | for (;;) { |
1da177e4 LT |
994 | for (j = 0; j < eccsteps; j++) { |
995 | /* Loop through and verify the data */ | |
996 | if (this->verify_buf(mtd, &this->data_poi[datidx], mtd->eccsize)) { | |
e0c7d767 | 997 | DEBUG(MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); |
1da177e4 LT |
998 | goto out; |
999 | } | |
1000 | datidx += mtd->eccsize; | |
1001 | /* Have we a hw generator layout ? */ | |
1002 | if (!hweccbytes) | |
1003 | continue; | |
1004 | if (this->verify_buf(mtd, &this->oob_buf[oobofs], hweccbytes)) { | |
e0c7d767 | 1005 | DEBUG(MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); |
1da177e4 LT |
1006 | goto out; |
1007 | } | |
1008 | oobofs += hweccbytes; | |
1009 | } | |
1010 | ||
1011 | /* check, if we must compare all data or if we just have to | |
1012 | * compare the ecc bytes | |
1013 | */ | |
1014 | if (oobmode) { | |
1015 | if (this->verify_buf(mtd, &oob_buf[oobofs], mtd->oobsize - hweccbytes * eccsteps)) { | |
e0c7d767 | 1016 | DEBUG(MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); |
1da177e4 LT |
1017 | goto out; |
1018 | } | |
1019 | } else { | |
1020 | /* Read always, else autoincrement fails */ | |
1021 | this->read_buf(mtd, oobdata, mtd->oobsize - hweccbytes * eccsteps); | |
1022 | ||
1023 | if (oobsel->useecc != MTD_NANDECC_OFF && !hweccbytes) { | |
1024 | int ecccnt = oobsel->eccbytes; | |
61b03bd7 | 1025 | |
1da177e4 LT |
1026 | for (i = 0; i < ecccnt; i++) { |
1027 | int idx = oobsel->eccpos[i]; | |
e0c7d767 DW |
1028 | if (oobdata[idx] != oob_buf[oobofs + idx]) { |
1029 | DEBUG(MTD_DEBUG_LEVEL0, "%s: Failed ECC write verify, page 0x%08x, %6i bytes were succesful\n", | |
1030 | __FUNCTION__, page, i); | |
1da177e4 LT |
1031 | goto out; |
1032 | } | |
1033 | } | |
61b03bd7 | 1034 | } |
1da177e4 LT |
1035 | } |
1036 | oobofs += mtd->oobsize - hweccbytes * eccsteps; | |
1037 | page++; | |
1038 | numpages--; | |
1039 | ||
61b03bd7 | 1040 | /* Apply delay or wait for ready/busy pin |
1da177e4 LT |
1041 | * Do this before the AUTOINCR check, so no problems |
1042 | * arise if a chip which does auto increment | |
1043 | * is marked as NOAUTOINCR by the board driver. | |
1044 | * Do this also before returning, so the chip is | |
1045 | * ready for the next command. | |
e0c7d767 | 1046 | */ |
61b03bd7 | 1047 | if (!this->dev_ready) |
e0c7d767 | 1048 | udelay(this->chip_delay); |
1da177e4 | 1049 | else |
3b88775c | 1050 | nand_wait_ready(mtd); |
1da177e4 LT |
1051 | |
1052 | /* All done, return happy */ | |
1053 | if (!numpages) | |
1054 | return 0; | |
61b03bd7 | 1055 | |
61b03bd7 | 1056 | /* Check, if the chip supports auto page increment */ |
1da177e4 | 1057 | if (!NAND_CANAUTOINCR(this)) |
e0c7d767 | 1058 | this->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page); |
1da177e4 | 1059 | } |
61b03bd7 | 1060 | /* |
1da177e4 LT |
1061 | * Terminate the read command. We come here in case of an error |
1062 | * So we must issue a reset command. | |
1063 | */ | |
e0c7d767 DW |
1064 | out: |
1065 | this->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); | |
1da177e4 LT |
1066 | return res; |
1067 | } | |
1068 | #endif | |
1069 | ||
1070 | /** | |
068e3c0a | 1071 | * nand_read - [MTD Interface] MTD compability function for nand_do_read_ecc |
1da177e4 LT |
1072 | * @mtd: MTD device structure |
1073 | * @from: offset to read from | |
1074 | * @len: number of bytes to read | |
1075 | * @retlen: pointer to variable to store the number of read bytes | |
1076 | * @buf: the databuffer to put data | |
1077 | * | |
068e3c0a DM |
1078 | * This function simply calls nand_do_read_ecc with oob buffer and oobsel = NULL |
1079 | * and flags = 0xff | |
1080 | */ | |
58dd8f2b | 1081 | static int nand_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, uint8_t *buf) |
1da177e4 | 1082 | { |
e0c7d767 | 1083 | return nand_do_read_ecc(mtd, from, len, retlen, buf, NULL, &mtd->oobinfo, 0xff); |
22c60f5f | 1084 | } |
1da177e4 | 1085 | |
1da177e4 | 1086 | /** |
068e3c0a | 1087 | * nand_read_ecc - [MTD Interface] MTD compability function for nand_do_read_ecc |
1da177e4 LT |
1088 | * @mtd: MTD device structure |
1089 | * @from: offset to read from | |
1090 | * @len: number of bytes to read | |
1091 | * @retlen: pointer to variable to store the number of read bytes | |
1092 | * @buf: the databuffer to put data | |
1093 | * @oob_buf: filesystem supplied oob data buffer | |
1094 | * @oobsel: oob selection structure | |
1095 | * | |
068e3c0a | 1096 | * This function simply calls nand_do_read_ecc with flags = 0xff |
1da177e4 | 1097 | */ |
e0c7d767 | 1098 | static int nand_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, |
58dd8f2b | 1099 | size_t *retlen, uint8_t *buf, uint8_t *oob_buf, struct nand_oobinfo *oobsel) |
068e3c0a | 1100 | { |
22c60f5f TG |
1101 | /* use userspace supplied oobinfo, if zero */ |
1102 | if (oobsel == NULL) | |
1103 | oobsel = &mtd->oobinfo; | |
068e3c0a DM |
1104 | return nand_do_read_ecc(mtd, from, len, retlen, buf, oob_buf, oobsel, 0xff); |
1105 | } | |
1106 | ||
068e3c0a DM |
1107 | /** |
1108 | * nand_do_read_ecc - [MTD Interface] Read data with ECC | |
1109 | * @mtd: MTD device structure | |
1110 | * @from: offset to read from | |
1111 | * @len: number of bytes to read | |
1112 | * @retlen: pointer to variable to store the number of read bytes | |
1113 | * @buf: the databuffer to put data | |
bb75ba4c | 1114 | * @oob_buf: filesystem supplied oob data buffer (can be NULL) |
22c60f5f | 1115 | * @oobsel: oob selection structure |
068e3c0a DM |
1116 | * @flags: flag to indicate if nand_get_device/nand_release_device should be preformed |
1117 | * and how many corrected error bits are acceptable: | |
1118 | * bits 0..7 - number of tolerable errors | |
1119 | * bit 8 - 0 == do not get/release chip, 1 == get/release chip | |
1120 | * | |
1121 | * NAND read with ECC | |
1122 | */ | |
e0c7d767 | 1123 | int nand_do_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, |
58dd8f2b | 1124 | size_t *retlen, uint8_t *buf, uint8_t *oob_buf, struct nand_oobinfo *oobsel, int flags) |
1da177e4 | 1125 | { |
22c60f5f | 1126 | |
1da177e4 LT |
1127 | int i, j, col, realpage, page, end, ecc, chipnr, sndcmd = 1; |
1128 | int read = 0, oob = 0, ecc_status = 0, ecc_failed = 0; | |
1129 | struct nand_chip *this = mtd->priv; | |
58dd8f2b TG |
1130 | uint8_t *data_poi, *oob_data = oob_buf; |
1131 | uint8_t ecc_calc[32]; | |
1132 | uint8_t ecc_code[32]; | |
e0c7d767 DW |
1133 | int eccmode, eccsteps; |
1134 | int *oob_config, datidx; | |
1135 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; | |
1136 | int eccbytes; | |
1137 | int compareecc = 1; | |
1138 | int oobreadlen; | |
1da177e4 | 1139 | |
e0c7d767 | 1140 | DEBUG(MTD_DEBUG_LEVEL3, "nand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int)from, (int)len); |
1da177e4 LT |
1141 | |
1142 | /* Do not allow reads past end of device */ | |
1143 | if ((from + len) > mtd->size) { | |
e0c7d767 | 1144 | DEBUG(MTD_DEBUG_LEVEL0, "nand_read_ecc: Attempt read beyond end of device\n"); |
1da177e4 LT |
1145 | *retlen = 0; |
1146 | return -EINVAL; | |
1147 | } | |
1148 | ||
1149 | /* Grab the lock and see if the device is available */ | |
068e3c0a | 1150 | if (flags & NAND_GET_DEVICE) |
e0c7d767 | 1151 | nand_get_device(this, mtd, FL_READING); |
1da177e4 | 1152 | |
1da177e4 LT |
1153 | /* Autoplace of oob data ? Use the default placement scheme */ |
1154 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) | |
1155 | oobsel = this->autooob; | |
61b03bd7 | 1156 | |
1da177e4 LT |
1157 | eccmode = oobsel->useecc ? this->eccmode : NAND_ECC_NONE; |
1158 | oob_config = oobsel->eccpos; | |
1159 | ||
1160 | /* Select the NAND device */ | |
1161 | chipnr = (int)(from >> this->chip_shift); | |
1162 | this->select_chip(mtd, chipnr); | |
1163 | ||
1164 | /* First we calculate the starting page */ | |
e0c7d767 | 1165 | realpage = (int)(from >> this->page_shift); |
1da177e4 LT |
1166 | page = realpage & this->pagemask; |
1167 | ||
1168 | /* Get raw starting column */ | |
1169 | col = from & (mtd->oobblock - 1); | |
1170 | ||
1171 | end = mtd->oobblock; | |
1172 | ecc = this->eccsize; | |
1173 | eccbytes = this->eccbytes; | |
61b03bd7 | 1174 | |
1da177e4 LT |
1175 | if ((eccmode == NAND_ECC_NONE) || (this->options & NAND_HWECC_SYNDROME)) |
1176 | compareecc = 0; | |
1177 | ||
1178 | oobreadlen = mtd->oobsize; | |
61b03bd7 | 1179 | if (this->options & NAND_HWECC_SYNDROME) |
1da177e4 LT |
1180 | oobreadlen -= oobsel->eccbytes; |
1181 | ||
1182 | /* Loop until all data read */ | |
1183 | while (read < len) { | |
61b03bd7 | 1184 | |
1da177e4 | 1185 | int aligned = (!col && (len - read) >= end); |
61b03bd7 | 1186 | /* |
1da177e4 LT |
1187 | * If the read is not page aligned, we have to read into data buffer |
1188 | * due to ecc, else we read into return buffer direct | |
1189 | */ | |
1190 | if (aligned) | |
1191 | data_poi = &buf[read]; | |
61b03bd7 | 1192 | else |
1da177e4 | 1193 | data_poi = this->data_buf; |
61b03bd7 TG |
1194 | |
1195 | /* Check, if we have this page in the buffer | |
1da177e4 LT |
1196 | * |
1197 | * FIXME: Make it work when we must provide oob data too, | |
1198 | * check the usage of data_buf oob field | |
1199 | */ | |
1200 | if (realpage == this->pagebuf && !oob_buf) { | |
1201 | /* aligned read ? */ | |
1202 | if (aligned) | |
e0c7d767 | 1203 | memcpy(data_poi, this->data_buf, end); |
1da177e4 LT |
1204 | goto readdata; |
1205 | } | |
1206 | ||
1207 | /* Check, if we must send the read command */ | |
1208 | if (sndcmd) { | |
e0c7d767 | 1209 | this->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page); |
1da177e4 | 1210 | sndcmd = 0; |
61b03bd7 | 1211 | } |
1da177e4 LT |
1212 | |
1213 | /* get oob area, if we have no oob buffer from fs-driver */ | |
90e260c8 TG |
1214 | if (!oob_buf || oobsel->useecc == MTD_NANDECC_AUTOPLACE || |
1215 | oobsel->useecc == MTD_NANDECC_AUTOPL_USR) | |
1da177e4 LT |
1216 | oob_data = &this->data_buf[end]; |
1217 | ||
1218 | eccsteps = this->eccsteps; | |
61b03bd7 | 1219 | |
1da177e4 | 1220 | switch (eccmode) { |
e0c7d767 DW |
1221 | case NAND_ECC_NONE:{ |
1222 | /* No ECC, Read in a page */ | |
1223 | static unsigned long lastwhinge = 0; | |
1224 | if ((lastwhinge / HZ) != (jiffies / HZ)) { | |
1225 | printk(KERN_WARNING | |
1226 | "Reading data from NAND FLASH without ECC is not recommended\n"); | |
1227 | lastwhinge = jiffies; | |
1228 | } | |
1229 | this->read_buf(mtd, data_poi, end); | |
1230 | break; | |
1da177e4 | 1231 | } |
61b03bd7 | 1232 | |
1da177e4 LT |
1233 | case NAND_ECC_SOFT: /* Software ECC 3/256: Read in a page + oob data */ |
1234 | this->read_buf(mtd, data_poi, end); | |
e0c7d767 | 1235 | for (i = 0, datidx = 0; eccsteps; eccsteps--, i += 3, datidx += ecc) |
1da177e4 | 1236 | this->calculate_ecc(mtd, &data_poi[datidx], &ecc_calc[i]); |
61b03bd7 | 1237 | break; |
1da177e4 LT |
1238 | |
1239 | default: | |
e0c7d767 | 1240 | for (i = 0, datidx = 0; eccsteps; eccsteps--, i += eccbytes, datidx += ecc) { |
1da177e4 LT |
1241 | this->enable_hwecc(mtd, NAND_ECC_READ); |
1242 | this->read_buf(mtd, &data_poi[datidx], ecc); | |
1243 | ||
1244 | /* HW ecc with syndrome calculation must read the | |
1245 | * syndrome from flash immidiately after the data */ | |
1246 | if (!compareecc) { | |
1247 | /* Some hw ecc generators need to know when the | |
1248 | * syndrome is read from flash */ | |
1249 | this->enable_hwecc(mtd, NAND_ECC_READSYN); | |
1250 | this->read_buf(mtd, &oob_data[i], eccbytes); | |
1251 | /* We calc error correction directly, it checks the hw | |
1252 | * generator for an error, reads back the syndrome and | |
1253 | * does the error correction on the fly */ | |
068e3c0a DM |
1254 | ecc_status = this->correct_data(mtd, &data_poi[datidx], &oob_data[i], &ecc_code[i]); |
1255 | if ((ecc_status == -1) || (ecc_status > (flags && 0xff))) { | |
e0c7d767 DW |
1256 | DEBUG(MTD_DEBUG_LEVEL0, "nand_read_ecc: " |
1257 | "Failed ECC read, page 0x%08x on chip %d\n", page, chipnr); | |
1da177e4 LT |
1258 | ecc_failed++; |
1259 | } | |
1260 | } else { | |
1261 | this->calculate_ecc(mtd, &data_poi[datidx], &ecc_calc[i]); | |
61b03bd7 | 1262 | } |
1da177e4 | 1263 | } |
61b03bd7 | 1264 | break; |
1da177e4 LT |
1265 | } |
1266 | ||
1267 | /* read oobdata */ | |
1268 | this->read_buf(mtd, &oob_data[mtd->oobsize - oobreadlen], oobreadlen); | |
1269 | ||
1270 | /* Skip ECC check, if not requested (ECC_NONE or HW_ECC with syndromes) */ | |
1271 | if (!compareecc) | |
61b03bd7 TG |
1272 | goto readoob; |
1273 | ||
1da177e4 LT |
1274 | /* Pick the ECC bytes out of the oob data */ |
1275 | for (j = 0; j < oobsel->eccbytes; j++) | |
1276 | ecc_code[j] = oob_data[oob_config[j]]; | |
1277 | ||
e0c7d767 | 1278 | /* correct data, if necessary */ |
1da177e4 LT |
1279 | for (i = 0, j = 0, datidx = 0; i < this->eccsteps; i++, datidx += ecc) { |
1280 | ecc_status = this->correct_data(mtd, &data_poi[datidx], &ecc_code[j], &ecc_calc[j]); | |
61b03bd7 | 1281 | |
1da177e4 LT |
1282 | /* Get next chunk of ecc bytes */ |
1283 | j += eccbytes; | |
61b03bd7 TG |
1284 | |
1285 | /* Check, if we have a fs supplied oob-buffer, | |
1da177e4 LT |
1286 | * This is the legacy mode. Used by YAFFS1 |
1287 | * Should go away some day | |
1288 | */ | |
61b03bd7 | 1289 | if (oob_buf && oobsel->useecc == MTD_NANDECC_PLACE) { |
1da177e4 LT |
1290 | int *p = (int *)(&oob_data[mtd->oobsize]); |
1291 | p[i] = ecc_status; | |
1292 | } | |
61b03bd7 TG |
1293 | |
1294 | if ((ecc_status == -1) || (ecc_status > (flags && 0xff))) { | |
e0c7d767 | 1295 | DEBUG(MTD_DEBUG_LEVEL0, "nand_read_ecc: " "Failed ECC read, page 0x%08x\n", page); |
1da177e4 LT |
1296 | ecc_failed++; |
1297 | } | |
61b03bd7 | 1298 | } |
1da177e4 | 1299 | |
e0c7d767 | 1300 | readoob: |
1da177e4 LT |
1301 | /* check, if we have a fs supplied oob-buffer */ |
1302 | if (oob_buf) { | |
1303 | /* without autoplace. Legacy mode used by YAFFS1 */ | |
e0c7d767 | 1304 | switch (oobsel->useecc) { |
1da177e4 | 1305 | case MTD_NANDECC_AUTOPLACE: |
90e260c8 | 1306 | case MTD_NANDECC_AUTOPL_USR: |
1da177e4 | 1307 | /* Walk through the autoplace chunks */ |
82e1d19f | 1308 | for (i = 0; oobsel->oobfree[i][1]; i++) { |
1da177e4 LT |
1309 | int from = oobsel->oobfree[i][0]; |
1310 | int num = oobsel->oobfree[i][1]; | |
1311 | memcpy(&oob_buf[oob], &oob_data[from], num); | |
82e1d19f | 1312 | oob += num; |
1da177e4 | 1313 | } |
1da177e4 LT |
1314 | break; |
1315 | case MTD_NANDECC_PLACE: | |
1316 | /* YAFFS1 legacy mode */ | |
e0c7d767 | 1317 | oob_data += this->eccsteps * sizeof(int); |
1da177e4 LT |
1318 | default: |
1319 | oob_data += mtd->oobsize; | |
1320 | } | |
1321 | } | |
1322 | readdata: | |
1323 | /* Partial page read, transfer data into fs buffer */ | |
61b03bd7 | 1324 | if (!aligned) { |
1da177e4 LT |
1325 | for (j = col; j < end && read < len; j++) |
1326 | buf[read++] = data_poi[j]; | |
61b03bd7 TG |
1327 | this->pagebuf = realpage; |
1328 | } else | |
1da177e4 LT |
1329 | read += mtd->oobblock; |
1330 | ||
61b03bd7 | 1331 | /* Apply delay or wait for ready/busy pin |
1da177e4 LT |
1332 | * Do this before the AUTOINCR check, so no problems |
1333 | * arise if a chip which does auto increment | |
1334 | * is marked as NOAUTOINCR by the board driver. | |
e0c7d767 | 1335 | */ |
61b03bd7 | 1336 | if (!this->dev_ready) |
e0c7d767 | 1337 | udelay(this->chip_delay); |
1da177e4 | 1338 | else |
3b88775c | 1339 | nand_wait_ready(mtd); |
61b03bd7 | 1340 | |
1da177e4 | 1341 | if (read == len) |
61b03bd7 | 1342 | break; |
1da177e4 LT |
1343 | |
1344 | /* For subsequent reads align to page boundary. */ | |
1345 | col = 0; | |
1346 | /* Increment page address */ | |
1347 | realpage++; | |
1348 | ||
1349 | page = realpage & this->pagemask; | |
1350 | /* Check, if we cross a chip boundary */ | |
1351 | if (!page) { | |
1352 | chipnr++; | |
1353 | this->select_chip(mtd, -1); | |
1354 | this->select_chip(mtd, chipnr); | |
1355 | } | |
61b03bd7 TG |
1356 | /* Check, if the chip supports auto page increment |
1357 | * or if we have hit a block boundary. | |
e0c7d767 | 1358 | */ |
1da177e4 | 1359 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) |
61b03bd7 | 1360 | sndcmd = 1; |
1da177e4 LT |
1361 | } |
1362 | ||
1363 | /* Deselect and wake up anyone waiting on the device */ | |
068e3c0a DM |
1364 | if (flags & NAND_GET_DEVICE) |
1365 | nand_release_device(mtd); | |
1da177e4 LT |
1366 | |
1367 | /* | |
1368 | * Return success, if no ECC failures, else -EBADMSG | |
1369 | * fs driver will take care of that, because | |
1370 | * retlen == desired len and result == -EBADMSG | |
1371 | */ | |
1372 | *retlen = read; | |
1373 | return ecc_failed ? -EBADMSG : 0; | |
1374 | } | |
1375 | ||
1376 | /** | |
1377 | * nand_read_oob - [MTD Interface] NAND read out-of-band | |
1378 | * @mtd: MTD device structure | |
1379 | * @from: offset to read from | |
1380 | * @len: number of bytes to read | |
1381 | * @retlen: pointer to variable to store the number of read bytes | |
1382 | * @buf: the databuffer to put data | |
1383 | * | |
1384 | * NAND read out-of-band data from the spare area | |
1385 | */ | |
58dd8f2b | 1386 | static int nand_read_oob(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, uint8_t *buf) |
1da177e4 LT |
1387 | { |
1388 | int i, col, page, chipnr; | |
1389 | struct nand_chip *this = mtd->priv; | |
e0c7d767 | 1390 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; |
1da177e4 | 1391 | |
e0c7d767 | 1392 | DEBUG(MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08x, len = %i\n", (unsigned int)from, (int)len); |
1da177e4 LT |
1393 | |
1394 | /* Shift to get page */ | |
1395 | page = (int)(from >> this->page_shift); | |
1396 | chipnr = (int)(from >> this->chip_shift); | |
61b03bd7 | 1397 | |
1da177e4 LT |
1398 | /* Mask to get column */ |
1399 | col = from & (mtd->oobsize - 1); | |
1400 | ||
1401 | /* Initialize return length value */ | |
1402 | *retlen = 0; | |
1403 | ||
1404 | /* Do not allow reads past end of device */ | |
1405 | if ((from + len) > mtd->size) { | |
e0c7d767 | 1406 | DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: Attempt read beyond end of device\n"); |
1da177e4 LT |
1407 | *retlen = 0; |
1408 | return -EINVAL; | |
1409 | } | |
1410 | ||
1411 | /* Grab the lock and see if the device is available */ | |
e0c7d767 | 1412 | nand_get_device(this, mtd, FL_READING); |
1da177e4 LT |
1413 | |
1414 | /* Select the NAND device */ | |
1415 | this->select_chip(mtd, chipnr); | |
1416 | ||
1417 | /* Send the read command */ | |
e0c7d767 | 1418 | this->cmdfunc(mtd, NAND_CMD_READOOB, col, page & this->pagemask); |
61b03bd7 | 1419 | /* |
1da177e4 LT |
1420 | * Read the data, if we read more than one page |
1421 | * oob data, let the device transfer the data ! | |
1422 | */ | |
1423 | i = 0; | |
1424 | while (i < len) { | |
1425 | int thislen = mtd->oobsize - col; | |
1426 | thislen = min_t(int, thislen, len); | |
1427 | this->read_buf(mtd, &buf[i], thislen); | |
1428 | i += thislen; | |
1da177e4 LT |
1429 | |
1430 | /* Read more ? */ | |
1431 | if (i < len) { | |
1432 | page++; | |
1433 | col = 0; | |
1434 | ||
1435 | /* Check, if we cross a chip boundary */ | |
1436 | if (!(page & this->pagemask)) { | |
1437 | chipnr++; | |
1438 | this->select_chip(mtd, -1); | |
1439 | this->select_chip(mtd, chipnr); | |
1440 | } | |
61b03bd7 TG |
1441 | |
1442 | /* Apply delay or wait for ready/busy pin | |
19870da7 TG |
1443 | * Do this before the AUTOINCR check, so no problems |
1444 | * arise if a chip which does auto increment | |
1445 | * is marked as NOAUTOINCR by the board driver. | |
1446 | */ | |
61b03bd7 | 1447 | if (!this->dev_ready) |
e0c7d767 | 1448 | udelay(this->chip_delay); |
19870da7 TG |
1449 | else |
1450 | nand_wait_ready(mtd); | |
1451 | ||
61b03bd7 TG |
1452 | /* Check, if the chip supports auto page increment |
1453 | * or if we have hit a block boundary. | |
e0c7d767 | 1454 | */ |
1da177e4 LT |
1455 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) { |
1456 | /* For subsequent page reads set offset to 0 */ | |
e0c7d767 | 1457 | this->cmdfunc(mtd, NAND_CMD_READOOB, 0x0, page & this->pagemask); |
1da177e4 LT |
1458 | } |
1459 | } | |
1460 | } | |
1461 | ||
1462 | /* Deselect and wake up anyone waiting on the device */ | |
1463 | nand_release_device(mtd); | |
1464 | ||
1465 | /* Return happy */ | |
1466 | *retlen = len; | |
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | /** | |
1471 | * nand_read_raw - [GENERIC] Read raw data including oob into buffer | |
1472 | * @mtd: MTD device structure | |
1473 | * @buf: temporary buffer | |
1474 | * @from: offset to read from | |
1475 | * @len: number of bytes to read | |
1476 | * @ooblen: number of oob data bytes to read | |
1477 | * | |
1478 | * Read raw data including oob into buffer | |
1479 | */ | |
e0c7d767 | 1480 | int nand_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t from, size_t len, size_t ooblen) |
1da177e4 LT |
1481 | { |
1482 | struct nand_chip *this = mtd->priv; | |
e0c7d767 DW |
1483 | int page = (int)(from >> this->page_shift); |
1484 | int chip = (int)(from >> this->chip_shift); | |
1da177e4 LT |
1485 | int sndcmd = 1; |
1486 | int cnt = 0; | |
1487 | int pagesize = mtd->oobblock + mtd->oobsize; | |
e0c7d767 | 1488 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; |
1da177e4 LT |
1489 | |
1490 | /* Do not allow reads past end of device */ | |
1491 | if ((from + len) > mtd->size) { | |
e0c7d767 | 1492 | DEBUG(MTD_DEBUG_LEVEL0, "nand_read_raw: Attempt read beyond end of device\n"); |
1da177e4 LT |
1493 | return -EINVAL; |
1494 | } | |
1495 | ||
1496 | /* Grab the lock and see if the device is available */ | |
e0c7d767 | 1497 | nand_get_device(this, mtd, FL_READING); |
1da177e4 | 1498 | |
e0c7d767 | 1499 | this->select_chip(mtd, chip); |
61b03bd7 | 1500 | |
1da177e4 LT |
1501 | /* Add requested oob length */ |
1502 | len += ooblen; | |
61b03bd7 | 1503 | |
1da177e4 LT |
1504 | while (len) { |
1505 | if (sndcmd) | |
e0c7d767 | 1506 | this->cmdfunc(mtd, NAND_CMD_READ0, 0, page & this->pagemask); |
61b03bd7 | 1507 | sndcmd = 0; |
1da177e4 | 1508 | |
e0c7d767 | 1509 | this->read_buf(mtd, &buf[cnt], pagesize); |
1da177e4 LT |
1510 | |
1511 | len -= pagesize; | |
1512 | cnt += pagesize; | |
1513 | page++; | |
61b03bd7 TG |
1514 | |
1515 | if (!this->dev_ready) | |
e0c7d767 | 1516 | udelay(this->chip_delay); |
1da177e4 | 1517 | else |
3b88775c | 1518 | nand_wait_ready(mtd); |
61b03bd7 TG |
1519 | |
1520 | /* Check, if the chip supports auto page increment */ | |
1da177e4 LT |
1521 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) |
1522 | sndcmd = 1; | |
1523 | } | |
1524 | ||
1525 | /* Deselect and wake up anyone waiting on the device */ | |
1526 | nand_release_device(mtd); | |
1527 | return 0; | |
1528 | } | |
1529 | ||
61b03bd7 TG |
1530 | /** |
1531 | * nand_prepare_oobbuf - [GENERIC] Prepare the out of band buffer | |
1da177e4 LT |
1532 | * @mtd: MTD device structure |
1533 | * @fsbuf: buffer given by fs driver | |
1534 | * @oobsel: out of band selection structre | |
1535 | * @autoplace: 1 = place given buffer into the oob bytes | |
1536 | * @numpages: number of pages to prepare | |
1537 | * | |
1538 | * Return: | |
1539 | * 1. Filesystem buffer available and autoplacement is off, | |
1540 | * return filesystem buffer | |
1541 | * 2. No filesystem buffer or autoplace is off, return internal | |
1542 | * buffer | |
1543 | * 3. Filesystem buffer is given and autoplace selected | |
1544 | * put data from fs buffer into internal buffer and | |
1545 | * retrun internal buffer | |
1546 | * | |
1547 | * Note: The internal buffer is filled with 0xff. This must | |
1548 | * be done only once, when no autoplacement happens | |
1549 | * Autoplacement sets the buffer dirty flag, which | |
1550 | * forces the 0xff fill before using the buffer again. | |
1551 | * | |
1552 | */ | |
58dd8f2b | 1553 | static uint8_t *nand_prepare_oobbuf(struct mtd_info *mtd, uint8_t *fsbuf, struct nand_oobinfo *oobsel, |
e0c7d767 | 1554 | int autoplace, int numpages) |
1da177e4 LT |
1555 | { |
1556 | struct nand_chip *this = mtd->priv; | |
1557 | int i, len, ofs; | |
1558 | ||
1559 | /* Zero copy fs supplied buffer */ | |
61b03bd7 | 1560 | if (fsbuf && !autoplace) |
1da177e4 LT |
1561 | return fsbuf; |
1562 | ||
1563 | /* Check, if the buffer must be filled with ff again */ | |
61b03bd7 | 1564 | if (this->oobdirty) { |
e0c7d767 | 1565 | memset(this->oob_buf, 0xff, mtd->oobsize << (this->phys_erase_shift - this->page_shift)); |
1da177e4 | 1566 | this->oobdirty = 0; |
61b03bd7 TG |
1567 | } |
1568 | ||
1da177e4 LT |
1569 | /* If we have no autoplacement or no fs buffer use the internal one */ |
1570 | if (!autoplace || !fsbuf) | |
1571 | return this->oob_buf; | |
61b03bd7 | 1572 | |
1da177e4 LT |
1573 | /* Walk through the pages and place the data */ |
1574 | this->oobdirty = 1; | |
1575 | ofs = 0; | |
1576 | while (numpages--) { | |
1577 | for (i = 0, len = 0; len < mtd->oobavail; i++) { | |
1578 | int to = ofs + oobsel->oobfree[i][0]; | |
1579 | int num = oobsel->oobfree[i][1]; | |
e0c7d767 | 1580 | memcpy(&this->oob_buf[to], fsbuf, num); |
1da177e4 LT |
1581 | len += num; |
1582 | fsbuf += num; | |
1583 | } | |
1584 | ofs += mtd->oobavail; | |
1585 | } | |
1586 | return this->oob_buf; | |
1587 | } | |
1588 | ||
1589 | #define NOTALIGNED(x) (x & (mtd->oobblock-1)) != 0 | |
1590 | ||
1591 | /** | |
1592 | * nand_write - [MTD Interface] compability function for nand_write_ecc | |
1593 | * @mtd: MTD device structure | |
1594 | * @to: offset to write to | |
1595 | * @len: number of bytes to write | |
1596 | * @retlen: pointer to variable to store the number of written bytes | |
1597 | * @buf: the data to write | |
1598 | * | |
1599 | * This function simply calls nand_write_ecc with oob buffer and oobsel = NULL | |
1600 | * | |
1601 | */ | |
58dd8f2b | 1602 | static int nand_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const uint8_t *buf) |
1da177e4 | 1603 | { |
e0c7d767 | 1604 | return (nand_write_ecc(mtd, to, len, retlen, buf, NULL, NULL)); |
1da177e4 | 1605 | } |
61b03bd7 | 1606 | |
1da177e4 LT |
1607 | /** |
1608 | * nand_write_ecc - [MTD Interface] NAND write with ECC | |
1609 | * @mtd: MTD device structure | |
1610 | * @to: offset to write to | |
1611 | * @len: number of bytes to write | |
1612 | * @retlen: pointer to variable to store the number of written bytes | |
1613 | * @buf: the data to write | |
1614 | * @eccbuf: filesystem supplied oob data buffer | |
1615 | * @oobsel: oob selection structure | |
1616 | * | |
1617 | * NAND write with ECC | |
1618 | */ | |
e0c7d767 | 1619 | static int nand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len, |
58dd8f2b | 1620 | size_t *retlen, const uint8_t *buf, uint8_t *eccbuf, |
e0c7d767 | 1621 | struct nand_oobinfo *oobsel) |
1da177e4 LT |
1622 | { |
1623 | int startpage, page, ret = -EIO, oob = 0, written = 0, chipnr; | |
1624 | int autoplace = 0, numpages, totalpages; | |
1625 | struct nand_chip *this = mtd->priv; | |
58dd8f2b | 1626 | uint8_t *oobbuf, *bufstart; |
e0c7d767 | 1627 | int ppblock = (1 << (this->phys_erase_shift - this->page_shift)); |
1da177e4 | 1628 | |
e0c7d767 | 1629 | DEBUG(MTD_DEBUG_LEVEL3, "nand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int)to, (int)len); |
1da177e4 LT |
1630 | |
1631 | /* Initialize retlen, in case of early exit */ | |
1632 | *retlen = 0; | |
1633 | ||
1634 | /* Do not allow write past end of device */ | |
1635 | if ((to + len) > mtd->size) { | |
e0c7d767 | 1636 | DEBUG(MTD_DEBUG_LEVEL0, "nand_write_ecc: Attempt to write past end of page\n"); |
1da177e4 LT |
1637 | return -EINVAL; |
1638 | } | |
1639 | ||
61b03bd7 | 1640 | /* reject writes, which are not page aligned */ |
e0c7d767 DW |
1641 | if (NOTALIGNED(to) || NOTALIGNED(len)) { |
1642 | printk(KERN_NOTICE "nand_write_ecc: Attempt to write not page aligned data\n"); | |
1da177e4 LT |
1643 | return -EINVAL; |
1644 | } | |
1645 | ||
1646 | /* Grab the lock and see if the device is available */ | |
e0c7d767 | 1647 | nand_get_device(this, mtd, FL_WRITING); |
1da177e4 LT |
1648 | |
1649 | /* Calculate chipnr */ | |
1650 | chipnr = (int)(to >> this->chip_shift); | |
1651 | /* Select the NAND device */ | |
1652 | this->select_chip(mtd, chipnr); | |
1653 | ||
1654 | /* Check, if it is write protected */ | |
1655 | if (nand_check_wp(mtd)) | |
1656 | goto out; | |
1657 | ||
1658 | /* if oobsel is NULL, use chip defaults */ | |
61b03bd7 TG |
1659 | if (oobsel == NULL) |
1660 | oobsel = &mtd->oobinfo; | |
1661 | ||
1da177e4 LT |
1662 | /* Autoplace of oob data ? Use the default placement scheme */ |
1663 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) { | |
1664 | oobsel = this->autooob; | |
1665 | autoplace = 1; | |
61b03bd7 | 1666 | } |
90e260c8 TG |
1667 | if (oobsel->useecc == MTD_NANDECC_AUTOPL_USR) |
1668 | autoplace = 1; | |
1da177e4 LT |
1669 | |
1670 | /* Setup variables and oob buffer */ | |
1671 | totalpages = len >> this->page_shift; | |
e0c7d767 | 1672 | page = (int)(to >> this->page_shift); |
1da177e4 | 1673 | /* Invalidate the page cache, if we write to the cached page */ |
61b03bd7 | 1674 | if (page <= this->pagebuf && this->pagebuf < (page + totalpages)) |
1da177e4 | 1675 | this->pagebuf = -1; |
61b03bd7 | 1676 | |
1da177e4 LT |
1677 | /* Set it relative to chip */ |
1678 | page &= this->pagemask; | |
1679 | startpage = page; | |
1680 | /* Calc number of pages we can write in one go */ | |
e0c7d767 DW |
1681 | numpages = min(ppblock - (startpage & (ppblock - 1)), totalpages); |
1682 | oobbuf = nand_prepare_oobbuf(mtd, eccbuf, oobsel, autoplace, numpages); | |
58dd8f2b | 1683 | bufstart = (uint8_t *) buf; |
1da177e4 LT |
1684 | |
1685 | /* Loop until all data is written */ | |
1686 | while (written < len) { | |
1687 | ||
58dd8f2b | 1688 | this->data_poi = (uint8_t *) &buf[written]; |
1da177e4 LT |
1689 | /* Write one page. If this is the last page to write |
1690 | * or the last page in this block, then use the | |
1691 | * real pageprogram command, else select cached programming | |
1692 | * if supported by the chip. | |
1693 | */ | |
e0c7d767 | 1694 | ret = nand_write_page(mtd, this, page, &oobbuf[oob], oobsel, (--numpages > 0)); |
1da177e4 | 1695 | if (ret) { |
e0c7d767 | 1696 | DEBUG(MTD_DEBUG_LEVEL0, "nand_write_ecc: write_page failed %d\n", ret); |
1da177e4 | 1697 | goto out; |
61b03bd7 | 1698 | } |
1da177e4 LT |
1699 | /* Next oob page */ |
1700 | oob += mtd->oobsize; | |
1701 | /* Update written bytes count */ | |
1702 | written += mtd->oobblock; | |
61b03bd7 | 1703 | if (written == len) |
1da177e4 | 1704 | goto cmp; |
61b03bd7 | 1705 | |
1da177e4 LT |
1706 | /* Increment page address */ |
1707 | page++; | |
1708 | ||
1709 | /* Have we hit a block boundary ? Then we have to verify and | |
1710 | * if verify is ok, we have to setup the oob buffer for | |
1711 | * the next pages. | |
e0c7d767 DW |
1712 | */ |
1713 | if (!(page & (ppblock - 1))) { | |
1da177e4 LT |
1714 | int ofs; |
1715 | this->data_poi = bufstart; | |
e0c7d767 DW |
1716 | ret = nand_verify_pages(mtd, this, startpage, page - startpage, |
1717 | oobbuf, oobsel, chipnr, (eccbuf != NULL)); | |
1da177e4 | 1718 | if (ret) { |
e0c7d767 | 1719 | DEBUG(MTD_DEBUG_LEVEL0, "nand_write_ecc: verify_pages failed %d\n", ret); |
1da177e4 | 1720 | goto out; |
61b03bd7 | 1721 | } |
1da177e4 LT |
1722 | *retlen = written; |
1723 | ||
1724 | ofs = autoplace ? mtd->oobavail : mtd->oobsize; | |
1725 | if (eccbuf) | |
1726 | eccbuf += (page - startpage) * ofs; | |
1727 | totalpages -= page - startpage; | |
e0c7d767 | 1728 | numpages = min(totalpages, ppblock); |
1da177e4 LT |
1729 | page &= this->pagemask; |
1730 | startpage = page; | |
e0c7d767 | 1731 | oobbuf = nand_prepare_oobbuf(mtd, eccbuf, oobsel, autoplace, numpages); |
868801e5 | 1732 | oob = 0; |
1da177e4 LT |
1733 | /* Check, if we cross a chip boundary */ |
1734 | if (!page) { | |
1735 | chipnr++; | |
1736 | this->select_chip(mtd, -1); | |
1737 | this->select_chip(mtd, chipnr); | |
1738 | } | |
1739 | } | |
1740 | } | |
1741 | /* Verify the remaining pages */ | |
e0c7d767 | 1742 | cmp: |
1da177e4 | 1743 | this->data_poi = bufstart; |
e0c7d767 | 1744 | ret = nand_verify_pages(mtd, this, startpage, totalpages, oobbuf, oobsel, chipnr, (eccbuf != NULL)); |
1da177e4 LT |
1745 | if (!ret) |
1746 | *retlen = written; | |
61b03bd7 | 1747 | else |
e0c7d767 | 1748 | DEBUG(MTD_DEBUG_LEVEL0, "nand_write_ecc: verify_pages failed %d\n", ret); |
1da177e4 | 1749 | |
e0c7d767 | 1750 | out: |
1da177e4 LT |
1751 | /* Deselect and wake up anyone waiting on the device */ |
1752 | nand_release_device(mtd); | |
1753 | ||
1754 | return ret; | |
1755 | } | |
1756 | ||
1da177e4 LT |
1757 | /** |
1758 | * nand_write_oob - [MTD Interface] NAND write out-of-band | |
1759 | * @mtd: MTD device structure | |
1760 | * @to: offset to write to | |
1761 | * @len: number of bytes to write | |
1762 | * @retlen: pointer to variable to store the number of written bytes | |
1763 | * @buf: the data to write | |
1764 | * | |
1765 | * NAND write out-of-band | |
1766 | */ | |
58dd8f2b | 1767 | static int nand_write_oob(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const uint8_t *buf) |
1da177e4 LT |
1768 | { |
1769 | int column, page, status, ret = -EIO, chipnr; | |
1770 | struct nand_chip *this = mtd->priv; | |
1771 | ||
e0c7d767 | 1772 | DEBUG(MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n", (unsigned int)to, (int)len); |
1da177e4 LT |
1773 | |
1774 | /* Shift to get page */ | |
e0c7d767 DW |
1775 | page = (int)(to >> this->page_shift); |
1776 | chipnr = (int)(to >> this->chip_shift); | |
1da177e4 LT |
1777 | |
1778 | /* Mask to get column */ | |
1779 | column = to & (mtd->oobsize - 1); | |
1780 | ||
1781 | /* Initialize return length value */ | |
1782 | *retlen = 0; | |
1783 | ||
1784 | /* Do not allow write past end of page */ | |
1785 | if ((column + len) > mtd->oobsize) { | |
e0c7d767 | 1786 | DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: Attempt to write past end of page\n"); |
1da177e4 LT |
1787 | return -EINVAL; |
1788 | } | |
1789 | ||
1790 | /* Grab the lock and see if the device is available */ | |
e0c7d767 | 1791 | nand_get_device(this, mtd, FL_WRITING); |
1da177e4 LT |
1792 | |
1793 | /* Select the NAND device */ | |
1794 | this->select_chip(mtd, chipnr); | |
1795 | ||
1796 | /* Reset the chip. Some chips (like the Toshiba TC5832DC found | |
1797 | in one of my DiskOnChip 2000 test units) will clear the whole | |
1798 | data page too if we don't do this. I have no clue why, but | |
1799 | I seem to have 'fixed' it in the doc2000 driver in | |
1800 | August 1999. dwmw2. */ | |
1801 | this->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); | |
1802 | ||
1803 | /* Check, if it is write protected */ | |
1804 | if (nand_check_wp(mtd)) | |
1805 | goto out; | |
61b03bd7 | 1806 | |
1da177e4 LT |
1807 | /* Invalidate the page cache, if we write to the cached page */ |
1808 | if (page == this->pagebuf) | |
1809 | this->pagebuf = -1; | |
1810 | ||
1811 | if (NAND_MUST_PAD(this)) { | |
1812 | /* Write out desired data */ | |
e0c7d767 | 1813 | this->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->oobblock, page & this->pagemask); |
1da177e4 LT |
1814 | /* prepad 0xff for partial programming */ |
1815 | this->write_buf(mtd, ffchars, column); | |
1816 | /* write data */ | |
1817 | this->write_buf(mtd, buf, len); | |
1818 | /* postpad 0xff for partial programming */ | |
e0c7d767 | 1819 | this->write_buf(mtd, ffchars, mtd->oobsize - (len + column)); |
1da177e4 LT |
1820 | } else { |
1821 | /* Write out desired data */ | |
e0c7d767 | 1822 | this->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->oobblock + column, page & this->pagemask); |
1da177e4 LT |
1823 | /* write data */ |
1824 | this->write_buf(mtd, buf, len); | |
1825 | } | |
1826 | /* Send command to program the OOB data */ | |
e0c7d767 | 1827 | this->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); |
1da177e4 | 1828 | |
e0c7d767 | 1829 | status = this->waitfunc(mtd, this, FL_WRITING); |
1da177e4 LT |
1830 | |
1831 | /* See if device thinks it succeeded */ | |
a4ab4c5d | 1832 | if (status & NAND_STATUS_FAIL) { |
e0c7d767 | 1833 | DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write, page 0x%08x\n", page); |
1da177e4 LT |
1834 | ret = -EIO; |
1835 | goto out; | |
1836 | } | |
1837 | /* Return happy */ | |
1838 | *retlen = len; | |
1839 | ||
1840 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE | |
1841 | /* Send command to read back the data */ | |
e0c7d767 | 1842 | this->cmdfunc(mtd, NAND_CMD_READOOB, column, page & this->pagemask); |
1da177e4 LT |
1843 | |
1844 | if (this->verify_buf(mtd, buf, len)) { | |
e0c7d767 | 1845 | DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write verify, page 0x%08x\n", page); |
1da177e4 LT |
1846 | ret = -EIO; |
1847 | goto out; | |
1848 | } | |
1849 | #endif | |
1850 | ret = 0; | |
e0c7d767 | 1851 | out: |
1da177e4 LT |
1852 | /* Deselect and wake up anyone waiting on the device */ |
1853 | nand_release_device(mtd); | |
1854 | ||
1855 | return ret; | |
1856 | } | |
1857 | ||
1da177e4 LT |
1858 | /** |
1859 | * nand_writev - [MTD Interface] compabilty function for nand_writev_ecc | |
1860 | * @mtd: MTD device structure | |
1861 | * @vecs: the iovectors to write | |
1862 | * @count: number of vectors | |
1863 | * @to: offset to write to | |
1864 | * @retlen: pointer to variable to store the number of written bytes | |
1865 | * | |
1866 | * NAND write with kvec. This just calls the ecc function | |
1867 | */ | |
e0c7d767 DW |
1868 | static int nand_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, |
1869 | loff_t to, size_t *retlen) | |
1da177e4 | 1870 | { |
e0c7d767 | 1871 | return (nand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL)); |
1da177e4 LT |
1872 | } |
1873 | ||
1874 | /** | |
1875 | * nand_writev_ecc - [MTD Interface] write with iovec with ecc | |
1876 | * @mtd: MTD device structure | |
1877 | * @vecs: the iovectors to write | |
1878 | * @count: number of vectors | |
1879 | * @to: offset to write to | |
1880 | * @retlen: pointer to variable to store the number of written bytes | |
1881 | * @eccbuf: filesystem supplied oob data buffer | |
1882 | * @oobsel: oob selection structure | |
1883 | * | |
1884 | * NAND write with iovec with ecc | |
1885 | */ | |
e0c7d767 | 1886 | static int nand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, |
58dd8f2b | 1887 | loff_t to, size_t *retlen, uint8_t *eccbuf, struct nand_oobinfo *oobsel) |
1da177e4 LT |
1888 | { |
1889 | int i, page, len, total_len, ret = -EIO, written = 0, chipnr; | |
1890 | int oob, numpages, autoplace = 0, startpage; | |
1891 | struct nand_chip *this = mtd->priv; | |
e0c7d767 | 1892 | int ppblock = (1 << (this->phys_erase_shift - this->page_shift)); |
58dd8f2b | 1893 | uint8_t *oobbuf, *bufstart; |
1da177e4 LT |
1894 | |
1895 | /* Preset written len for early exit */ | |
1896 | *retlen = 0; | |
1897 | ||
1898 | /* Calculate total length of data */ | |
1899 | total_len = 0; | |
1900 | for (i = 0; i < count; i++) | |
e0c7d767 | 1901 | total_len += (int)vecs[i].iov_len; |
1da177e4 | 1902 | |
e0c7d767 | 1903 | DEBUG(MTD_DEBUG_LEVEL3, "nand_writev: to = 0x%08x, len = %i, count = %ld\n", (unsigned int)to, (unsigned int)total_len, count); |
1da177e4 LT |
1904 | |
1905 | /* Do not allow write past end of page */ | |
1906 | if ((to + total_len) > mtd->size) { | |
e0c7d767 | 1907 | DEBUG(MTD_DEBUG_LEVEL0, "nand_writev: Attempted write past end of device\n"); |
1da177e4 LT |
1908 | return -EINVAL; |
1909 | } | |
1910 | ||
61b03bd7 | 1911 | /* reject writes, which are not page aligned */ |
e0c7d767 DW |
1912 | if (NOTALIGNED(to) || NOTALIGNED(total_len)) { |
1913 | printk(KERN_NOTICE "nand_write_ecc: Attempt to write not page aligned data\n"); | |
1da177e4 LT |
1914 | return -EINVAL; |
1915 | } | |
1916 | ||
1917 | /* Grab the lock and see if the device is available */ | |
e0c7d767 | 1918 | nand_get_device(this, mtd, FL_WRITING); |
1da177e4 LT |
1919 | |
1920 | /* Get the current chip-nr */ | |
e0c7d767 | 1921 | chipnr = (int)(to >> this->chip_shift); |
1da177e4 LT |
1922 | /* Select the NAND device */ |
1923 | this->select_chip(mtd, chipnr); | |
1924 | ||
1925 | /* Check, if it is write protected */ | |
1926 | if (nand_check_wp(mtd)) | |
1927 | goto out; | |
1928 | ||
1929 | /* if oobsel is NULL, use chip defaults */ | |
61b03bd7 TG |
1930 | if (oobsel == NULL) |
1931 | oobsel = &mtd->oobinfo; | |
1da177e4 LT |
1932 | |
1933 | /* Autoplace of oob data ? Use the default placement scheme */ | |
1934 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) { | |
1935 | oobsel = this->autooob; | |
1936 | autoplace = 1; | |
61b03bd7 | 1937 | } |
90e260c8 TG |
1938 | if (oobsel->useecc == MTD_NANDECC_AUTOPL_USR) |
1939 | autoplace = 1; | |
1da177e4 LT |
1940 | |
1941 | /* Setup start page */ | |
e0c7d767 | 1942 | page = (int)(to >> this->page_shift); |
1da177e4 | 1943 | /* Invalidate the page cache, if we write to the cached page */ |
61b03bd7 | 1944 | if (page <= this->pagebuf && this->pagebuf < ((to + total_len) >> this->page_shift)) |
1da177e4 LT |
1945 | this->pagebuf = -1; |
1946 | ||
1947 | startpage = page & this->pagemask; | |
1948 | ||
1949 | /* Loop until all kvec' data has been written */ | |
1950 | len = 0; | |
1951 | while (count) { | |
1952 | /* If the given tuple is >= pagesize then | |
1953 | * write it out from the iov | |
1954 | */ | |
1955 | if ((vecs->iov_len - len) >= mtd->oobblock) { | |
1956 | /* Calc number of pages we can write | |
1957 | * out of this iov in one go */ | |
1958 | numpages = (vecs->iov_len - len) >> this->page_shift; | |
1959 | /* Do not cross block boundaries */ | |
e0c7d767 DW |
1960 | numpages = min(ppblock - (startpage & (ppblock - 1)), numpages); |
1961 | oobbuf = nand_prepare_oobbuf(mtd, NULL, oobsel, autoplace, numpages); | |
58dd8f2b | 1962 | bufstart = (uint8_t *) vecs->iov_base; |
1da177e4 LT |
1963 | bufstart += len; |
1964 | this->data_poi = bufstart; | |
1965 | oob = 0; | |
1966 | for (i = 1; i <= numpages; i++) { | |
1967 | /* Write one page. If this is the last page to write | |
61b03bd7 | 1968 | * then use the real pageprogram command, else select |
1da177e4 LT |
1969 | * cached programming if supported by the chip. |
1970 | */ | |
e0c7d767 DW |
1971 | ret = nand_write_page(mtd, this, page & this->pagemask, |
1972 | &oobbuf[oob], oobsel, i != numpages); | |
1da177e4 LT |
1973 | if (ret) |
1974 | goto out; | |
1975 | this->data_poi += mtd->oobblock; | |
1976 | len += mtd->oobblock; | |
1977 | oob += mtd->oobsize; | |
1978 | page++; | |
1979 | } | |
1980 | /* Check, if we have to switch to the next tuple */ | |
e0c7d767 | 1981 | if (len >= (int)vecs->iov_len) { |
1da177e4 LT |
1982 | vecs++; |
1983 | len = 0; | |
1984 | count--; | |
1985 | } | |
1986 | } else { | |
61b03bd7 | 1987 | /* We must use the internal buffer, read data out of each |
1da177e4 LT |
1988 | * tuple until we have a full page to write |
1989 | */ | |
1990 | int cnt = 0; | |
1991 | while (cnt < mtd->oobblock) { | |
61b03bd7 | 1992 | if (vecs->iov_base != NULL && vecs->iov_len) |
58dd8f2b | 1993 | this->data_buf[cnt++] = ((uint8_t *) vecs->iov_base)[len++]; |
1da177e4 | 1994 | /* Check, if we have to switch to the next tuple */ |
e0c7d767 | 1995 | if (len >= (int)vecs->iov_len) { |
1da177e4 LT |
1996 | vecs++; |
1997 | len = 0; | |
1998 | count--; | |
1999 | } | |
2000 | } | |
61b03bd7 TG |
2001 | this->pagebuf = page; |
2002 | this->data_poi = this->data_buf; | |
1da177e4 | 2003 | bufstart = this->data_poi; |
61b03bd7 | 2004 | numpages = 1; |
e0c7d767 DW |
2005 | oobbuf = nand_prepare_oobbuf(mtd, NULL, oobsel, autoplace, numpages); |
2006 | ret = nand_write_page(mtd, this, page & this->pagemask, oobbuf, oobsel, 0); | |
1da177e4 LT |
2007 | if (ret) |
2008 | goto out; | |
2009 | page++; | |
2010 | } | |
2011 | ||
2012 | this->data_poi = bufstart; | |
e0c7d767 | 2013 | ret = nand_verify_pages(mtd, this, startpage, numpages, oobbuf, oobsel, chipnr, 0); |
1da177e4 LT |
2014 | if (ret) |
2015 | goto out; | |
61b03bd7 | 2016 | |
1da177e4 LT |
2017 | written += mtd->oobblock * numpages; |
2018 | /* All done ? */ | |
2019 | if (!count) | |
2020 | break; | |
2021 | ||
2022 | startpage = page & this->pagemask; | |
2023 | /* Check, if we cross a chip boundary */ | |
2024 | if (!startpage) { | |
2025 | chipnr++; | |
2026 | this->select_chip(mtd, -1); | |
2027 | this->select_chip(mtd, chipnr); | |
2028 | } | |
2029 | } | |
2030 | ret = 0; | |
e0c7d767 | 2031 | out: |
1da177e4 LT |
2032 | /* Deselect and wake up anyone waiting on the device */ |
2033 | nand_release_device(mtd); | |
2034 | ||
2035 | *retlen = written; | |
2036 | return ret; | |
2037 | } | |
2038 | ||
2039 | /** | |
2040 | * single_erease_cmd - [GENERIC] NAND standard block erase command function | |
2041 | * @mtd: MTD device structure | |
2042 | * @page: the page address of the block which will be erased | |
2043 | * | |
2044 | * Standard erase command for NAND chips | |
2045 | */ | |
e0c7d767 | 2046 | static void single_erase_cmd(struct mtd_info *mtd, int page) |
1da177e4 LT |
2047 | { |
2048 | struct nand_chip *this = mtd->priv; | |
2049 | /* Send commands to erase a block */ | |
e0c7d767 DW |
2050 | this->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page); |
2051 | this->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1); | |
1da177e4 LT |
2052 | } |
2053 | ||
2054 | /** | |
2055 | * multi_erease_cmd - [GENERIC] AND specific block erase command function | |
2056 | * @mtd: MTD device structure | |
2057 | * @page: the page address of the block which will be erased | |
2058 | * | |
2059 | * AND multi block erase command function | |
2060 | * Erase 4 consecutive blocks | |
2061 | */ | |
e0c7d767 | 2062 | static void multi_erase_cmd(struct mtd_info *mtd, int page) |
1da177e4 LT |
2063 | { |
2064 | struct nand_chip *this = mtd->priv; | |
2065 | /* Send commands to erase a block */ | |
e0c7d767 DW |
2066 | this->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++); |
2067 | this->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++); | |
2068 | this->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++); | |
2069 | this->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page); | |
2070 | this->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1); | |
1da177e4 LT |
2071 | } |
2072 | ||
2073 | /** | |
2074 | * nand_erase - [MTD Interface] erase block(s) | |
2075 | * @mtd: MTD device structure | |
2076 | * @instr: erase instruction | |
2077 | * | |
2078 | * Erase one ore more blocks | |
2079 | */ | |
e0c7d767 | 2080 | static int nand_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 | 2081 | { |
e0c7d767 | 2082 | return nand_erase_nand(mtd, instr, 0); |
1da177e4 | 2083 | } |
61b03bd7 | 2084 | |
30f464b7 | 2085 | #define BBT_PAGE_MASK 0xffffff3f |
1da177e4 LT |
2086 | /** |
2087 | * nand_erase_intern - [NAND Interface] erase block(s) | |
2088 | * @mtd: MTD device structure | |
2089 | * @instr: erase instruction | |
2090 | * @allowbbt: allow erasing the bbt area | |
2091 | * | |
2092 | * Erase one ore more blocks | |
2093 | */ | |
e0c7d767 | 2094 | int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr, int allowbbt) |
1da177e4 LT |
2095 | { |
2096 | int page, len, status, pages_per_block, ret, chipnr; | |
2097 | struct nand_chip *this = mtd->priv; | |
30f464b7 DM |
2098 | int rewrite_bbt[NAND_MAX_CHIPS]={0}; /* flags to indicate the page, if bbt needs to be rewritten. */ |
2099 | unsigned int bbt_masked_page; /* bbt mask to compare to page being erased. */ | |
2100 | /* It is used to see if the current page is in the same */ | |
2101 | /* 256 block group and the same bank as the bbt. */ | |
1da177e4 | 2102 | |
e0c7d767 | 2103 | DEBUG(MTD_DEBUG_LEVEL3, "nand_erase: start = 0x%08x, len = %i\n", (unsigned int)instr->addr, (unsigned int)instr->len); |
1da177e4 LT |
2104 | |
2105 | /* Start address must align on block boundary */ | |
2106 | if (instr->addr & ((1 << this->phys_erase_shift) - 1)) { | |
e0c7d767 | 2107 | DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: Unaligned address\n"); |
1da177e4 LT |
2108 | return -EINVAL; |
2109 | } | |
2110 | ||
2111 | /* Length must align on block boundary */ | |
2112 | if (instr->len & ((1 << this->phys_erase_shift) - 1)) { | |
e0c7d767 | 2113 | DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: Length not block aligned\n"); |
1da177e4 LT |
2114 | return -EINVAL; |
2115 | } | |
2116 | ||
2117 | /* Do not allow erase past end of device */ | |
2118 | if ((instr->len + instr->addr) > mtd->size) { | |
e0c7d767 | 2119 | DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: Erase past end of device\n"); |
1da177e4 LT |
2120 | return -EINVAL; |
2121 | } | |
2122 | ||
2123 | instr->fail_addr = 0xffffffff; | |
2124 | ||
2125 | /* Grab the lock and see if the device is available */ | |
e0c7d767 | 2126 | nand_get_device(this, mtd, FL_ERASING); |
1da177e4 LT |
2127 | |
2128 | /* Shift to get first page */ | |
e0c7d767 DW |
2129 | page = (int)(instr->addr >> this->page_shift); |
2130 | chipnr = (int)(instr->addr >> this->chip_shift); | |
1da177e4 LT |
2131 | |
2132 | /* Calculate pages in each block */ | |
2133 | pages_per_block = 1 << (this->phys_erase_shift - this->page_shift); | |
2134 | ||
2135 | /* Select the NAND device */ | |
2136 | this->select_chip(mtd, chipnr); | |
2137 | ||
2138 | /* Check the WP bit */ | |
2139 | /* Check, if it is write protected */ | |
2140 | if (nand_check_wp(mtd)) { | |
e0c7d767 | 2141 | DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: Device is write protected!!!\n"); |
1da177e4 LT |
2142 | instr->state = MTD_ERASE_FAILED; |
2143 | goto erase_exit; | |
2144 | } | |
2145 | ||
30f464b7 DM |
2146 | /* if BBT requires refresh, set the BBT page mask to see if the BBT should be rewritten */ |
2147 | if (this->options & BBT_AUTO_REFRESH) { | |
2148 | bbt_masked_page = this->bbt_td->pages[chipnr] & BBT_PAGE_MASK; | |
2149 | } else { | |
2150 | bbt_masked_page = 0xffffffff; /* should not match anything */ | |
2151 | } | |
2152 | ||
1da177e4 LT |
2153 | /* Loop through the pages */ |
2154 | len = instr->len; | |
2155 | ||
2156 | instr->state = MTD_ERASING; | |
2157 | ||
2158 | while (len) { | |
2159 | /* Check if we have a bad block, we do not erase bad blocks ! */ | |
2160 | if (nand_block_checkbad(mtd, ((loff_t) page) << this->page_shift, 0, allowbbt)) { | |
e0c7d767 | 2161 | printk(KERN_WARNING "nand_erase: attempt to erase a bad block at page 0x%08x\n", page); |
1da177e4 LT |
2162 | instr->state = MTD_ERASE_FAILED; |
2163 | goto erase_exit; | |
2164 | } | |
61b03bd7 TG |
2165 | |
2166 | /* Invalidate the page cache, if we erase the block which contains | |
1da177e4 LT |
2167 | the current cached page */ |
2168 | if (page <= this->pagebuf && this->pagebuf < (page + pages_per_block)) | |
2169 | this->pagebuf = -1; | |
2170 | ||
e0c7d767 | 2171 | this->erase_cmd(mtd, page & this->pagemask); |
61b03bd7 | 2172 | |
e0c7d767 | 2173 | status = this->waitfunc(mtd, this, FL_ERASING); |
1da177e4 | 2174 | |
068e3c0a DM |
2175 | /* See if operation failed and additional status checks are available */ |
2176 | if ((status & NAND_STATUS_FAIL) && (this->errstat)) { | |
2177 | status = this->errstat(mtd, this, FL_ERASING, status, page); | |
2178 | } | |
2179 | ||
1da177e4 | 2180 | /* See if block erase succeeded */ |
a4ab4c5d | 2181 | if (status & NAND_STATUS_FAIL) { |
e0c7d767 | 2182 | DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: " "Failed erase, page 0x%08x\n", page); |
1da177e4 LT |
2183 | instr->state = MTD_ERASE_FAILED; |
2184 | instr->fail_addr = (page << this->page_shift); | |
2185 | goto erase_exit; | |
2186 | } | |
30f464b7 DM |
2187 | |
2188 | /* if BBT requires refresh, set the BBT rewrite flag to the page being erased */ | |
2189 | if (this->options & BBT_AUTO_REFRESH) { | |
61b03bd7 | 2190 | if (((page & BBT_PAGE_MASK) == bbt_masked_page) && |
30f464b7 DM |
2191 | (page != this->bbt_td->pages[chipnr])) { |
2192 | rewrite_bbt[chipnr] = (page << this->page_shift); | |
2193 | } | |
2194 | } | |
61b03bd7 | 2195 | |
1da177e4 LT |
2196 | /* Increment page address and decrement length */ |
2197 | len -= (1 << this->phys_erase_shift); | |
2198 | page += pages_per_block; | |
2199 | ||
2200 | /* Check, if we cross a chip boundary */ | |
2201 | if (len && !(page & this->pagemask)) { | |
2202 | chipnr++; | |
2203 | this->select_chip(mtd, -1); | |
2204 | this->select_chip(mtd, chipnr); | |
30f464b7 | 2205 | |
61b03bd7 | 2206 | /* if BBT requires refresh and BBT-PERCHIP, |
30f464b7 DM |
2207 | * set the BBT page mask to see if this BBT should be rewritten */ |
2208 | if ((this->options & BBT_AUTO_REFRESH) && (this->bbt_td->options & NAND_BBT_PERCHIP)) { | |
2209 | bbt_masked_page = this->bbt_td->pages[chipnr] & BBT_PAGE_MASK; | |
2210 | } | |
2211 | ||
1da177e4 LT |
2212 | } |
2213 | } | |
2214 | instr->state = MTD_ERASE_DONE; | |
2215 | ||
e0c7d767 | 2216 | erase_exit: |
1da177e4 LT |
2217 | |
2218 | ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO; | |
2219 | /* Do call back function */ | |
2220 | if (!ret) | |
2221 | mtd_erase_callback(instr); | |
2222 | ||
2223 | /* Deselect and wake up anyone waiting on the device */ | |
2224 | nand_release_device(mtd); | |
2225 | ||
30f464b7 DM |
2226 | /* if BBT requires refresh and erase was successful, rewrite any selected bad block tables */ |
2227 | if ((this->options & BBT_AUTO_REFRESH) && (!ret)) { | |
2228 | for (chipnr = 0; chipnr < this->numchips; chipnr++) { | |
2229 | if (rewrite_bbt[chipnr]) { | |
2230 | /* update the BBT for chip */ | |
e0c7d767 DW |
2231 | DEBUG(MTD_DEBUG_LEVEL0, "nand_erase_nand: nand_update_bbt (%d:0x%0x 0x%0x)\n", |
2232 | chipnr, rewrite_bbt[chipnr], this->bbt_td->pages[chipnr]); | |
2233 | nand_update_bbt(mtd, rewrite_bbt[chipnr]); | |
30f464b7 DM |
2234 | } |
2235 | } | |
2236 | } | |
2237 | ||
1da177e4 LT |
2238 | /* Return more or less happy */ |
2239 | return ret; | |
2240 | } | |
2241 | ||
2242 | /** | |
2243 | * nand_sync - [MTD Interface] sync | |
2244 | * @mtd: MTD device structure | |
2245 | * | |
2246 | * Sync is actually a wait for chip ready function | |
2247 | */ | |
e0c7d767 | 2248 | static void nand_sync(struct mtd_info *mtd) |
1da177e4 LT |
2249 | { |
2250 | struct nand_chip *this = mtd->priv; | |
2251 | ||
e0c7d767 | 2252 | DEBUG(MTD_DEBUG_LEVEL3, "nand_sync: called\n"); |
1da177e4 LT |
2253 | |
2254 | /* Grab the lock and see if the device is available */ | |
e0c7d767 | 2255 | nand_get_device(this, mtd, FL_SYNCING); |
1da177e4 | 2256 | /* Release it and go back */ |
e0c7d767 | 2257 | nand_release_device(mtd); |
1da177e4 LT |
2258 | } |
2259 | ||
1da177e4 LT |
2260 | /** |
2261 | * nand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad | |
2262 | * @mtd: MTD device structure | |
2263 | * @ofs: offset relative to mtd start | |
2264 | */ | |
e0c7d767 | 2265 | static int nand_block_isbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
2266 | { |
2267 | /* Check for invalid offset */ | |
61b03bd7 | 2268 | if (ofs > mtd->size) |
1da177e4 | 2269 | return -EINVAL; |
61b03bd7 | 2270 | |
e0c7d767 | 2271 | return nand_block_checkbad(mtd, ofs, 1, 0); |
1da177e4 LT |
2272 | } |
2273 | ||
2274 | /** | |
2275 | * nand_block_markbad - [MTD Interface] Mark the block at the given offset as bad | |
2276 | * @mtd: MTD device structure | |
2277 | * @ofs: offset relative to mtd start | |
2278 | */ | |
e0c7d767 | 2279 | static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
2280 | { |
2281 | struct nand_chip *this = mtd->priv; | |
2282 | int ret; | |
2283 | ||
e0c7d767 DW |
2284 | if ((ret = nand_block_isbad(mtd, ofs))) { |
2285 | /* If it was bad already, return success and do nothing. */ | |
1da177e4 LT |
2286 | if (ret > 0) |
2287 | return 0; | |
e0c7d767 DW |
2288 | return ret; |
2289 | } | |
1da177e4 LT |
2290 | |
2291 | return this->block_markbad(mtd, ofs); | |
2292 | } | |
2293 | ||
962034f4 VW |
2294 | /** |
2295 | * nand_suspend - [MTD Interface] Suspend the NAND flash | |
2296 | * @mtd: MTD device structure | |
2297 | */ | |
2298 | static int nand_suspend(struct mtd_info *mtd) | |
2299 | { | |
2300 | struct nand_chip *this = mtd->priv; | |
2301 | ||
e0c7d767 | 2302 | return nand_get_device(this, mtd, FL_PM_SUSPENDED); |
962034f4 VW |
2303 | } |
2304 | ||
2305 | /** | |
2306 | * nand_resume - [MTD Interface] Resume the NAND flash | |
2307 | * @mtd: MTD device structure | |
2308 | */ | |
2309 | static void nand_resume(struct mtd_info *mtd) | |
2310 | { | |
2311 | struct nand_chip *this = mtd->priv; | |
2312 | ||
2313 | if (this->state == FL_PM_SUSPENDED) | |
2314 | nand_release_device(mtd); | |
2315 | else | |
2c0a2bed TG |
2316 | printk(KERN_ERR "nand_resume() called for a chip which is not " |
2317 | "in suspended state\n"); | |
962034f4 VW |
2318 | } |
2319 | ||
a36ed299 TG |
2320 | /* |
2321 | * Free allocated data structures | |
2322 | */ | |
2323 | static void nand_free_kmem(struct nand_chip *this) | |
2324 | { | |
2325 | /* Buffer allocated by nand_scan ? */ | |
2326 | if (this->options & NAND_OOBBUF_ALLOC) | |
2327 | kfree(this->oob_buf); | |
2328 | /* Buffer allocated by nand_scan ? */ | |
2329 | if (this->options & NAND_DATABUF_ALLOC) | |
2330 | kfree(this->data_buf); | |
2331 | /* Controller allocated by nand_scan ? */ | |
2332 | if (this->options & NAND_CONTROLLER_ALLOC) | |
2333 | kfree(this->controller); | |
2334 | } | |
2335 | ||
52239da1 DW |
2336 | /* module_text_address() isn't exported, and it's mostly a pointless |
2337 | test if this is a module _anyway_ -- they'd have to try _really_ hard | |
2338 | to call us from in-kernel code if the core NAND support is modular. */ | |
2339 | #ifdef MODULE | |
2340 | #define caller_is_module() (1) | |
2341 | #else | |
2342 | #define caller_is_module() module_text_address((unsigned long)__builtin_return_address(0)) | |
2343 | #endif | |
2344 | ||
1da177e4 LT |
2345 | /** |
2346 | * nand_scan - [NAND Interface] Scan for the NAND device | |
2347 | * @mtd: MTD device structure | |
2348 | * @maxchips: Number of chips to scan for | |
2349 | * | |
552d9205 | 2350 | * This fills out all the uninitialized function pointers |
1da177e4 LT |
2351 | * with the defaults. |
2352 | * The flash ID is read and the mtd/chip structures are | |
2353 | * filled with the appropriate values. Buffers are allocated if | |
2354 | * they are not provided by the board driver | |
552d9205 | 2355 | * The mtd->owner field must be set to the module of the caller |
1da177e4 LT |
2356 | * |
2357 | */ | |
e0c7d767 | 2358 | int nand_scan(struct mtd_info *mtd, int maxchips) |
1da177e4 | 2359 | { |
3b946e3f | 2360 | int i, nand_maf_id, nand_dev_id, busw, maf_id; |
1da177e4 LT |
2361 | struct nand_chip *this = mtd->priv; |
2362 | ||
52239da1 DW |
2363 | /* Many callers got this wrong, so check for it for a while... */ |
2364 | if (!mtd->owner && caller_is_module()) { | |
552d9205 DW |
2365 | printk(KERN_CRIT "nand_scan() called with NULL mtd->owner!\n"); |
2366 | BUG(); | |
2367 | } | |
2368 | ||
e0c7d767 | 2369 | /* Get buswidth to select the correct functions */ |
1da177e4 LT |
2370 | busw = this->options & NAND_BUSWIDTH_16; |
2371 | ||
2372 | /* check for proper chip_delay setup, set 20us if not */ | |
2373 | if (!this->chip_delay) | |
2374 | this->chip_delay = 20; | |
2375 | ||
2376 | /* check, if a user supplied command function given */ | |
2377 | if (this->cmdfunc == NULL) | |
2378 | this->cmdfunc = nand_command; | |
2379 | ||
2380 | /* check, if a user supplied wait function given */ | |
2381 | if (this->waitfunc == NULL) | |
2382 | this->waitfunc = nand_wait; | |
2383 | ||
2384 | if (!this->select_chip) | |
2385 | this->select_chip = nand_select_chip; | |
2386 | if (!this->write_byte) | |
2387 | this->write_byte = busw ? nand_write_byte16 : nand_write_byte; | |
2388 | if (!this->read_byte) | |
2389 | this->read_byte = busw ? nand_read_byte16 : nand_read_byte; | |
2390 | if (!this->write_word) | |
2391 | this->write_word = nand_write_word; | |
2392 | if (!this->read_word) | |
2393 | this->read_word = nand_read_word; | |
2394 | if (!this->block_bad) | |
2395 | this->block_bad = nand_block_bad; | |
2396 | if (!this->block_markbad) | |
2397 | this->block_markbad = nand_default_block_markbad; | |
2398 | if (!this->write_buf) | |
2399 | this->write_buf = busw ? nand_write_buf16 : nand_write_buf; | |
2400 | if (!this->read_buf) | |
2401 | this->read_buf = busw ? nand_read_buf16 : nand_read_buf; | |
2402 | if (!this->verify_buf) | |
2403 | this->verify_buf = busw ? nand_verify_buf16 : nand_verify_buf; | |
2404 | if (!this->scan_bbt) | |
2405 | this->scan_bbt = nand_default_bbt; | |
2406 | ||
2407 | /* Select the device */ | |
2408 | this->select_chip(mtd, 0); | |
2409 | ||
2410 | /* Send the command for reading device ID */ | |
e0c7d767 | 2411 | this->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1); |
1da177e4 LT |
2412 | |
2413 | /* Read manufacturer and device IDs */ | |
2414 | nand_maf_id = this->read_byte(mtd); | |
2415 | nand_dev_id = this->read_byte(mtd); | |
2416 | ||
2417 | /* Print and store flash device information */ | |
2418 | for (i = 0; nand_flash_ids[i].name != NULL; i++) { | |
61b03bd7 TG |
2419 | |
2420 | if (nand_dev_id != nand_flash_ids[i].id) | |
1da177e4 LT |
2421 | continue; |
2422 | ||
e0c7d767 DW |
2423 | if (!mtd->name) |
2424 | mtd->name = nand_flash_ids[i].name; | |
1da177e4 | 2425 | this->chipsize = nand_flash_ids[i].chipsize << 20; |
61b03bd7 | 2426 | |
1da177e4 LT |
2427 | /* New devices have all the information in additional id bytes */ |
2428 | if (!nand_flash_ids[i].pagesize) { | |
2429 | int extid; | |
2430 | /* The 3rd id byte contains non relevant data ATM */ | |
2431 | extid = this->read_byte(mtd); | |
2432 | /* The 4th id byte is the important one */ | |
2433 | extid = this->read_byte(mtd); | |
2434 | /* Calc pagesize */ | |
2435 | mtd->oobblock = 1024 << (extid & 0x3); | |
2436 | extid >>= 2; | |
2437 | /* Calc oobsize */ | |
d4094661 | 2438 | mtd->oobsize = (8 << (extid & 0x01)) * (mtd->oobblock >> 9); |
1da177e4 LT |
2439 | extid >>= 2; |
2440 | /* Calc blocksize. Blocksize is multiples of 64KiB */ | |
e0c7d767 | 2441 | mtd->erasesize = (64 * 1024) << (extid & 0x03); |
1da177e4 LT |
2442 | extid >>= 2; |
2443 | /* Get buswidth information */ | |
2444 | busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0; | |
61b03bd7 | 2445 | |
1da177e4 LT |
2446 | } else { |
2447 | /* Old devices have this data hardcoded in the | |
2448 | * device id table */ | |
2449 | mtd->erasesize = nand_flash_ids[i].erasesize; | |
2450 | mtd->oobblock = nand_flash_ids[i].pagesize; | |
2451 | mtd->oobsize = mtd->oobblock / 32; | |
2452 | busw = nand_flash_ids[i].options & NAND_BUSWIDTH_16; | |
2453 | } | |
2454 | ||
0ea4a755 KP |
2455 | /* Try to identify manufacturer */ |
2456 | for (maf_id = 0; nand_manuf_ids[maf_id].id != 0x0; maf_id++) { | |
2457 | if (nand_manuf_ids[maf_id].id == nand_maf_id) | |
2458 | break; | |
2459 | } | |
2460 | ||
1da177e4 LT |
2461 | /* Check, if buswidth is correct. Hardware drivers should set |
2462 | * this correct ! */ | |
2463 | if (busw != (this->options & NAND_BUSWIDTH_16)) { | |
e0c7d767 DW |
2464 | printk(KERN_INFO "NAND device: Manufacturer ID:" |
2465 | " 0x%02x, Chip ID: 0x%02x (%s %s)\n", nand_maf_id, nand_dev_id, | |
2466 | nand_manuf_ids[maf_id].name, mtd->name); | |
2467 | printk(KERN_WARNING | |
2468 | "NAND bus width %d instead %d bit\n", | |
2469 | (this->options & NAND_BUSWIDTH_16) ? 16 : 8, busw ? 16 : 8); | |
1da177e4 | 2470 | this->select_chip(mtd, -1); |
61b03bd7 | 2471 | return 1; |
1da177e4 | 2472 | } |
61b03bd7 TG |
2473 | |
2474 | /* Calculate the address shift from the page size */ | |
1da177e4 LT |
2475 | this->page_shift = ffs(mtd->oobblock) - 1; |
2476 | this->bbt_erase_shift = this->phys_erase_shift = ffs(mtd->erasesize) - 1; | |
2477 | this->chip_shift = ffs(this->chipsize) - 1; | |
2478 | ||
2479 | /* Set the bad block position */ | |
e0c7d767 | 2480 | this->badblockpos = mtd->oobblock > 512 ? NAND_LARGE_BADBLOCK_POS : NAND_SMALL_BADBLOCK_POS; |
1da177e4 LT |
2481 | |
2482 | /* Get chip options, preserve non chip based options */ | |
2483 | this->options &= ~NAND_CHIPOPTIONS_MSK; | |
2484 | this->options |= nand_flash_ids[i].options & NAND_CHIPOPTIONS_MSK; | |
e0c7d767 | 2485 | /* Set this as a default. Board drivers can override it, if necessary */ |
1da177e4 LT |
2486 | this->options |= NAND_NO_AUTOINCR; |
2487 | /* Check if this is a not a samsung device. Do not clear the options | |
2488 | * for chips which are not having an extended id. | |
61b03bd7 | 2489 | */ |
1da177e4 LT |
2490 | if (nand_maf_id != NAND_MFR_SAMSUNG && !nand_flash_ids[i].pagesize) |
2491 | this->options &= ~NAND_SAMSUNG_LP_OPTIONS; | |
61b03bd7 | 2492 | |
1da177e4 LT |
2493 | /* Check for AND chips with 4 page planes */ |
2494 | if (this->options & NAND_4PAGE_ARRAY) | |
2495 | this->erase_cmd = multi_erase_cmd; | |
2496 | else | |
2497 | this->erase_cmd = single_erase_cmd; | |
2498 | ||
2499 | /* Do not replace user supplied command function ! */ | |
2500 | if (mtd->oobblock > 512 && this->cmdfunc == nand_command) | |
2501 | this->cmdfunc = nand_command_lp; | |
61b03bd7 | 2502 | |
e0c7d767 DW |
2503 | printk(KERN_INFO "NAND device: Manufacturer ID:" |
2504 | " 0x%02x, Chip ID: 0x%02x (%s %s)\n", nand_maf_id, nand_dev_id, | |
2505 | nand_manuf_ids[maf_id].name, nand_flash_ids[i].name); | |
1da177e4 LT |
2506 | break; |
2507 | } | |
2508 | ||
2509 | if (!nand_flash_ids[i].name) { | |
e0c7d767 | 2510 | printk(KERN_WARNING "No NAND device found!!!\n"); |
1da177e4 LT |
2511 | this->select_chip(mtd, -1); |
2512 | return 1; | |
2513 | } | |
2514 | ||
e0c7d767 | 2515 | for (i = 1; i < maxchips; i++) { |
1da177e4 LT |
2516 | this->select_chip(mtd, i); |
2517 | ||
2518 | /* Send the command for reading device ID */ | |
e0c7d767 | 2519 | this->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1); |
1da177e4 LT |
2520 | |
2521 | /* Read manufacturer and device IDs */ | |
2522 | if (nand_maf_id != this->read_byte(mtd) || | |
2523 | nand_dev_id != this->read_byte(mtd)) | |
2524 | break; | |
2525 | } | |
2526 | if (i > 1) | |
2527 | printk(KERN_INFO "%d NAND chips detected\n", i); | |
61b03bd7 | 2528 | |
e0c7d767 | 2529 | /* Allocate buffers, if necessary */ |
1da177e4 LT |
2530 | if (!this->oob_buf) { |
2531 | size_t len; | |
2532 | len = mtd->oobsize << (this->phys_erase_shift - this->page_shift); | |
e0c7d767 | 2533 | this->oob_buf = kmalloc(len, GFP_KERNEL); |
1da177e4 | 2534 | if (!this->oob_buf) { |
e0c7d767 | 2535 | printk(KERN_ERR "nand_scan(): Cannot allocate oob_buf\n"); |
1da177e4 LT |
2536 | return -ENOMEM; |
2537 | } | |
2538 | this->options |= NAND_OOBBUF_ALLOC; | |
2539 | } | |
61b03bd7 | 2540 | |
1da177e4 LT |
2541 | if (!this->data_buf) { |
2542 | size_t len; | |
2543 | len = mtd->oobblock + mtd->oobsize; | |
e0c7d767 | 2544 | this->data_buf = kmalloc(len, GFP_KERNEL); |
1da177e4 | 2545 | if (!this->data_buf) { |
e0c7d767 | 2546 | printk(KERN_ERR "nand_scan(): Cannot allocate data_buf\n"); |
a36ed299 | 2547 | nand_free_kmem(this); |
1da177e4 LT |
2548 | return -ENOMEM; |
2549 | } | |
2550 | this->options |= NAND_DATABUF_ALLOC; | |
2551 | } | |
2552 | ||
2553 | /* Store the number of chips and calc total size for mtd */ | |
2554 | this->numchips = i; | |
2555 | mtd->size = i * this->chipsize; | |
2556 | /* Convert chipsize to number of pages per chip -1. */ | |
2557 | this->pagemask = (this->chipsize >> this->page_shift) - 1; | |
2558 | /* Preset the internal oob buffer */ | |
2559 | memset(this->oob_buf, 0xff, mtd->oobsize << (this->phys_erase_shift - this->page_shift)); | |
2560 | ||
2561 | /* If no default placement scheme is given, select an | |
2562 | * appropriate one */ | |
2563 | if (!this->autooob) { | |
2564 | /* Select the appropriate default oob placement scheme for | |
2565 | * placement agnostic filesystems */ | |
61b03bd7 | 2566 | switch (mtd->oobsize) { |
1da177e4 LT |
2567 | case 8: |
2568 | this->autooob = &nand_oob_8; | |
2569 | break; | |
2570 | case 16: | |
2571 | this->autooob = &nand_oob_16; | |
2572 | break; | |
2573 | case 64: | |
2574 | this->autooob = &nand_oob_64; | |
2575 | break; | |
2576 | default: | |
e0c7d767 | 2577 | printk(KERN_WARNING "No oob scheme defined for oobsize %d\n", mtd->oobsize); |
1da177e4 LT |
2578 | BUG(); |
2579 | } | |
2580 | } | |
61b03bd7 | 2581 | |
1da177e4 LT |
2582 | /* The number of bytes available for the filesystem to place fs dependend |
2583 | * oob data */ | |
998cf640 TG |
2584 | mtd->oobavail = 0; |
2585 | for (i = 0; this->autooob->oobfree[i][1]; i++) | |
2586 | mtd->oobavail += this->autooob->oobfree[i][1]; | |
1da177e4 | 2587 | |
61b03bd7 | 2588 | /* |
1da177e4 LT |
2589 | * check ECC mode, default to software |
2590 | * if 3byte/512byte hardware ECC is selected and we have 256 byte pagesize | |
61b03bd7 | 2591 | * fallback to software ECC |
e0c7d767 | 2592 | */ |
61b03bd7 | 2593 | this->eccsize = 256; /* set default eccsize */ |
1da177e4 LT |
2594 | this->eccbytes = 3; |
2595 | ||
2596 | switch (this->eccmode) { | |
2597 | case NAND_ECC_HW12_2048: | |
2598 | if (mtd->oobblock < 2048) { | |
2599 | printk(KERN_WARNING "2048 byte HW ECC not possible on %d byte page size, fallback to SW ECC\n", | |
2600 | mtd->oobblock); | |
2601 | this->eccmode = NAND_ECC_SOFT; | |
2602 | this->calculate_ecc = nand_calculate_ecc; | |
2603 | this->correct_data = nand_correct_data; | |
2604 | } else | |
2605 | this->eccsize = 2048; | |
2606 | break; | |
2607 | ||
61b03bd7 TG |
2608 | case NAND_ECC_HW3_512: |
2609 | case NAND_ECC_HW6_512: | |
2610 | case NAND_ECC_HW8_512: | |
1da177e4 | 2611 | if (mtd->oobblock == 256) { |
e0c7d767 | 2612 | printk(KERN_WARNING "512 byte HW ECC not possible on 256 Byte pagesize, fallback to SW ECC \n"); |
1da177e4 LT |
2613 | this->eccmode = NAND_ECC_SOFT; |
2614 | this->calculate_ecc = nand_calculate_ecc; | |
2615 | this->correct_data = nand_correct_data; | |
61b03bd7 | 2616 | } else |
e0c7d767 | 2617 | this->eccsize = 512; /* set eccsize to 512 */ |
1da177e4 | 2618 | break; |
61b03bd7 | 2619 | |
1da177e4 LT |
2620 | case NAND_ECC_HW3_256: |
2621 | break; | |
61b03bd7 TG |
2622 | |
2623 | case NAND_ECC_NONE: | |
e0c7d767 | 2624 | printk(KERN_WARNING "NAND_ECC_NONE selected by board driver. This is not recommended !!\n"); |
1da177e4 LT |
2625 | this->eccmode = NAND_ECC_NONE; |
2626 | break; | |
2627 | ||
61b03bd7 | 2628 | case NAND_ECC_SOFT: |
1da177e4 LT |
2629 | this->calculate_ecc = nand_calculate_ecc; |
2630 | this->correct_data = nand_correct_data; | |
2631 | break; | |
2632 | ||
2633 | default: | |
e0c7d767 | 2634 | printk(KERN_WARNING "Invalid NAND_ECC_MODE %d\n", this->eccmode); |
61b03bd7 TG |
2635 | BUG(); |
2636 | } | |
1da177e4 | 2637 | |
61b03bd7 | 2638 | /* Check hardware ecc function availability and adjust number of ecc bytes per |
1da177e4 | 2639 | * calculation step |
e0c7d767 | 2640 | */ |
1da177e4 LT |
2641 | switch (this->eccmode) { |
2642 | case NAND_ECC_HW12_2048: | |
2643 | this->eccbytes += 4; | |
61b03bd7 | 2644 | case NAND_ECC_HW8_512: |
1da177e4 | 2645 | this->eccbytes += 2; |
61b03bd7 | 2646 | case NAND_ECC_HW6_512: |
1da177e4 | 2647 | this->eccbytes += 3; |
61b03bd7 | 2648 | case NAND_ECC_HW3_512: |
1da177e4 LT |
2649 | case NAND_ECC_HW3_256: |
2650 | if (this->calculate_ecc && this->correct_data && this->enable_hwecc) | |
2651 | break; | |
e0c7d767 | 2652 | printk(KERN_WARNING "No ECC functions supplied, Hardware ECC not possible\n"); |
61b03bd7 | 2653 | BUG(); |
1da177e4 | 2654 | } |
61b03bd7 | 2655 | |
1da177e4 | 2656 | mtd->eccsize = this->eccsize; |
61b03bd7 | 2657 | |
1da177e4 LT |
2658 | /* Set the number of read / write steps for one page to ensure ECC generation */ |
2659 | switch (this->eccmode) { | |
2660 | case NAND_ECC_HW12_2048: | |
2661 | this->eccsteps = mtd->oobblock / 2048; | |
2662 | break; | |
2663 | case NAND_ECC_HW3_512: | |
2664 | case NAND_ECC_HW6_512: | |
2665 | case NAND_ECC_HW8_512: | |
2666 | this->eccsteps = mtd->oobblock / 512; | |
2667 | break; | |
2668 | case NAND_ECC_HW3_256: | |
61b03bd7 | 2669 | case NAND_ECC_SOFT: |
1da177e4 LT |
2670 | this->eccsteps = mtd->oobblock / 256; |
2671 | break; | |
61b03bd7 TG |
2672 | |
2673 | case NAND_ECC_NONE: | |
1da177e4 LT |
2674 | this->eccsteps = 1; |
2675 | break; | |
2676 | } | |
61b03bd7 | 2677 | |
1da177e4 LT |
2678 | /* Initialize state, waitqueue and spinlock */ |
2679 | this->state = FL_READY; | |
a36ed299 TG |
2680 | if (!this->controller) { |
2681 | this->controller = kzalloc(sizeof(struct nand_hw_control), | |
2682 | GFP_KERNEL); | |
2683 | if (!this->controller) { | |
2684 | nand_free_kmem(this); | |
2685 | return -ENOMEM; | |
2686 | } | |
2687 | this->options |= NAND_CONTROLLER_ALLOC; | |
2688 | } | |
2689 | init_waitqueue_head(&this->controller->wq); | |
2690 | spin_lock_init(&this->controller->lock); | |
1da177e4 LT |
2691 | |
2692 | /* De-select the device */ | |
2693 | this->select_chip(mtd, -1); | |
2694 | ||
2695 | /* Invalidate the pagebuffer reference */ | |
2696 | this->pagebuf = -1; | |
2697 | ||
2698 | /* Fill in remaining MTD driver data */ | |
2699 | mtd->type = MTD_NANDFLASH; | |
2700 | mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC; | |
2701 | mtd->ecctype = MTD_ECC_SW; | |
2702 | mtd->erase = nand_erase; | |
2703 | mtd->point = NULL; | |
2704 | mtd->unpoint = NULL; | |
2705 | mtd->read = nand_read; | |
2706 | mtd->write = nand_write; | |
2707 | mtd->read_ecc = nand_read_ecc; | |
2708 | mtd->write_ecc = nand_write_ecc; | |
2709 | mtd->read_oob = nand_read_oob; | |
2710 | mtd->write_oob = nand_write_oob; | |
2711 | mtd->readv = NULL; | |
2712 | mtd->writev = nand_writev; | |
2713 | mtd->writev_ecc = nand_writev_ecc; | |
2714 | mtd->sync = nand_sync; | |
2715 | mtd->lock = NULL; | |
2716 | mtd->unlock = NULL; | |
962034f4 VW |
2717 | mtd->suspend = nand_suspend; |
2718 | mtd->resume = nand_resume; | |
1da177e4 LT |
2719 | mtd->block_isbad = nand_block_isbad; |
2720 | mtd->block_markbad = nand_block_markbad; | |
2721 | ||
2722 | /* and make the autooob the default one */ | |
2723 | memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo)); | |
2724 | ||
0040bf38 TG |
2725 | /* Check, if we should skip the bad block table scan */ |
2726 | if (this->options & NAND_SKIP_BBTSCAN) | |
2727 | return 0; | |
1da177e4 LT |
2728 | |
2729 | /* Build bad block table */ | |
e0c7d767 | 2730 | return this->scan_bbt(mtd); |
1da177e4 LT |
2731 | } |
2732 | ||
2733 | /** | |
61b03bd7 | 2734 | * nand_release - [NAND Interface] Free resources held by the NAND device |
1da177e4 LT |
2735 | * @mtd: MTD device structure |
2736 | */ | |
e0c7d767 | 2737 | void nand_release(struct mtd_info *mtd) |
1da177e4 LT |
2738 | { |
2739 | struct nand_chip *this = mtd->priv; | |
2740 | ||
2741 | #ifdef CONFIG_MTD_PARTITIONS | |
2742 | /* Deregister partitions */ | |
e0c7d767 | 2743 | del_mtd_partitions(mtd); |
1da177e4 LT |
2744 | #endif |
2745 | /* Deregister the device */ | |
e0c7d767 | 2746 | del_mtd_device(mtd); |
1da177e4 | 2747 | |
fa671646 | 2748 | /* Free bad block table memory */ |
e0c7d767 | 2749 | kfree(this->bbt); |
a36ed299 TG |
2750 | /* Free buffers */ |
2751 | nand_free_kmem(this); | |
1da177e4 LT |
2752 | } |
2753 | ||
e0c7d767 DW |
2754 | EXPORT_SYMBOL_GPL(nand_scan); |
2755 | EXPORT_SYMBOL_GPL(nand_release); | |
8fe833c1 RP |
2756 | |
2757 | static int __init nand_base_init(void) | |
2758 | { | |
2759 | led_trigger_register_simple("nand-disk", &nand_led_trigger); | |
2760 | return 0; | |
2761 | } | |
2762 | ||
2763 | static void __exit nand_base_exit(void) | |
2764 | { | |
2765 | led_trigger_unregister_simple(nand_led_trigger); | |
2766 | } | |
2767 | ||
2768 | module_init(nand_base_init); | |
2769 | module_exit(nand_base_exit); | |
2770 | ||
e0c7d767 DW |
2771 | MODULE_LICENSE("GPL"); |
2772 | MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com>, Thomas Gleixner <tglx@linutronix.de>"); | |
2773 | MODULE_DESCRIPTION("Generic NAND flash driver code"); |