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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. | |
8 | * | |
9 | * Additional technical information is available on | |
10 | * http://www.linux-mtd.infradead.org/tech/nand.html | |
11 | * | |
12 | * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) | |
13 | * 2002 Thomas Gleixner (tglx@linutronix.de) | |
14 | * | |
15 | * 02-08-2004 tglx: support for strange chips, which cannot auto increment | |
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 | |
24 | * | |
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 | |
28 | * among multiple independend devices. Suggestions and initial patch | |
29 | * from Ben Dooks <ben-mtd@fluff.org> | |
30 | * | |
30f464b7 DM |
31 | * 12-05-2004 dmarlin: add workaround for Renesas AG-AND chips "disturb" issue. |
32 | * Basically, any block not rewritten may lose data when surrounding blocks | |
33 | * are rewritten many times. JFFS2 ensures this doesn't happen for blocks | |
34 | * it uses, but the Bad Block Table(s) may not be rewritten. To ensure they | |
35 | * do not lose data, force them to be rewritten when some of the surrounding | |
36 | * blocks are erased. Rather than tracking a specific nearby block (which | |
37 | * could itself go bad), use a page address 'mask' to select several blocks | |
38 | * in the same area, and rewrite the BBT when any of them are erased. | |
39 | * | |
40 | * 01-03-2005 dmarlin: added support for the device recovery command sequence for Renesas | |
41 | * AG-AND chips. If there was a sudden loss of power during an erase operation, | |
42 | * a "device recovery" operation must be performed when power is restored | |
43 | * to ensure correct operation. | |
44 | * | |
1da177e4 LT |
45 | * Credits: |
46 | * David Woodhouse for adding multichip support | |
47 | * | |
48 | * Aleph One Ltd. and Toby Churchill Ltd. for supporting the | |
49 | * rework for 2K page size chips | |
50 | * | |
51 | * TODO: | |
52 | * Enable cached programming for 2k page size chips | |
53 | * Check, if mtd->ecctype should be set to MTD_ECC_HW | |
54 | * if we have HW ecc support. | |
55 | * The AG-AND chips have nice features for speed improvement, | |
56 | * which are not supported yet. Read / program 4 pages in one go. | |
57 | * | |
a4ab4c5d | 58 | * $Id: nand_base.c,v 1.129 2005/01/23 18:30:50 dmarlin Exp $ |
1da177e4 LT |
59 | * |
60 | * This program is free software; you can redistribute it and/or modify | |
61 | * it under the terms of the GNU General Public License version 2 as | |
62 | * published by the Free Software Foundation. | |
63 | * | |
64 | */ | |
65 | ||
66 | #include <linux/delay.h> | |
67 | #include <linux/errno.h> | |
68 | #include <linux/sched.h> | |
69 | #include <linux/slab.h> | |
70 | #include <linux/types.h> | |
71 | #include <linux/mtd/mtd.h> | |
72 | #include <linux/mtd/nand.h> | |
73 | #include <linux/mtd/nand_ecc.h> | |
74 | #include <linux/mtd/compatmac.h> | |
75 | #include <linux/interrupt.h> | |
76 | #include <linux/bitops.h> | |
77 | #include <asm/io.h> | |
78 | ||
79 | #ifdef CONFIG_MTD_PARTITIONS | |
80 | #include <linux/mtd/partitions.h> | |
81 | #endif | |
82 | ||
83 | /* Define default oob placement schemes for large and small page devices */ | |
84 | static struct nand_oobinfo nand_oob_8 = { | |
85 | .useecc = MTD_NANDECC_AUTOPLACE, | |
86 | .eccbytes = 3, | |
87 | .eccpos = {0, 1, 2}, | |
88 | .oobfree = { {3, 2}, {6, 2} } | |
89 | }; | |
90 | ||
91 | static struct nand_oobinfo nand_oob_16 = { | |
92 | .useecc = MTD_NANDECC_AUTOPLACE, | |
93 | .eccbytes = 6, | |
94 | .eccpos = {0, 1, 2, 3, 6, 7}, | |
95 | .oobfree = { {8, 8} } | |
96 | }; | |
97 | ||
98 | static struct nand_oobinfo nand_oob_64 = { | |
99 | .useecc = MTD_NANDECC_AUTOPLACE, | |
100 | .eccbytes = 24, | |
101 | .eccpos = { | |
102 | 40, 41, 42, 43, 44, 45, 46, 47, | |
103 | 48, 49, 50, 51, 52, 53, 54, 55, | |
104 | 56, 57, 58, 59, 60, 61, 62, 63}, | |
105 | .oobfree = { {2, 38} } | |
106 | }; | |
107 | ||
108 | /* This is used for padding purposes in nand_write_oob */ | |
109 | static u_char ffchars[] = { | |
110 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
111 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
112 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
113 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
114 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
115 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
116 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
117 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
118 | }; | |
119 | ||
120 | /* | |
121 | * NAND low-level MTD interface functions | |
122 | */ | |
123 | static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len); | |
124 | static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len); | |
125 | static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len); | |
126 | ||
127 | static int nand_read (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf); | |
128 | static int nand_read_ecc (struct mtd_info *mtd, loff_t from, size_t len, | |
129 | size_t * retlen, u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel); | |
130 | static int nand_read_oob (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf); | |
131 | static int nand_write (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char * buf); | |
132 | static int nand_write_ecc (struct mtd_info *mtd, loff_t to, size_t len, | |
133 | size_t * retlen, const u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel); | |
134 | static int nand_write_oob (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char *buf); | |
135 | static int nand_writev (struct mtd_info *mtd, const struct kvec *vecs, | |
136 | unsigned long count, loff_t to, size_t * retlen); | |
137 | static int nand_writev_ecc (struct mtd_info *mtd, const struct kvec *vecs, | |
138 | unsigned long count, loff_t to, size_t * retlen, u_char *eccbuf, struct nand_oobinfo *oobsel); | |
139 | static int nand_erase (struct mtd_info *mtd, struct erase_info *instr); | |
140 | static void nand_sync (struct mtd_info *mtd); | |
141 | ||
142 | /* Some internal functions */ | |
143 | static int nand_write_page (struct mtd_info *mtd, struct nand_chip *this, int page, u_char *oob_buf, | |
144 | struct nand_oobinfo *oobsel, int mode); | |
145 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE | |
146 | static int nand_verify_pages (struct mtd_info *mtd, struct nand_chip *this, int page, int numpages, | |
147 | u_char *oob_buf, struct nand_oobinfo *oobsel, int chipnr, int oobmode); | |
148 | #else | |
149 | #define nand_verify_pages(...) (0) | |
150 | #endif | |
151 | ||
152 | static void nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state); | |
153 | ||
154 | /** | |
155 | * nand_release_device - [GENERIC] release chip | |
156 | * @mtd: MTD device structure | |
157 | * | |
158 | * Deselect, release chip lock and wake up anyone waiting on the device | |
159 | */ | |
160 | static void nand_release_device (struct mtd_info *mtd) | |
161 | { | |
162 | struct nand_chip *this = mtd->priv; | |
163 | ||
164 | /* De-select the NAND device */ | |
165 | this->select_chip(mtd, -1); | |
166 | /* Do we have a hardware controller ? */ | |
167 | if (this->controller) { | |
168 | spin_lock(&this->controller->lock); | |
169 | this->controller->active = NULL; | |
170 | spin_unlock(&this->controller->lock); | |
171 | } | |
172 | /* Release the chip */ | |
173 | spin_lock (&this->chip_lock); | |
174 | this->state = FL_READY; | |
175 | wake_up (&this->wq); | |
176 | spin_unlock (&this->chip_lock); | |
177 | } | |
178 | ||
179 | /** | |
180 | * nand_read_byte - [DEFAULT] read one byte from the chip | |
181 | * @mtd: MTD device structure | |
182 | * | |
183 | * Default read function for 8bit buswith | |
184 | */ | |
185 | static u_char nand_read_byte(struct mtd_info *mtd) | |
186 | { | |
187 | struct nand_chip *this = mtd->priv; | |
188 | return readb(this->IO_ADDR_R); | |
189 | } | |
190 | ||
191 | /** | |
192 | * nand_write_byte - [DEFAULT] write one byte to the chip | |
193 | * @mtd: MTD device structure | |
194 | * @byte: pointer to data byte to write | |
195 | * | |
196 | * Default write function for 8it buswith | |
197 | */ | |
198 | static void nand_write_byte(struct mtd_info *mtd, u_char byte) | |
199 | { | |
200 | struct nand_chip *this = mtd->priv; | |
201 | writeb(byte, this->IO_ADDR_W); | |
202 | } | |
203 | ||
204 | /** | |
205 | * nand_read_byte16 - [DEFAULT] read one byte endianess aware from the chip | |
206 | * @mtd: MTD device structure | |
207 | * | |
208 | * Default read function for 16bit buswith with | |
209 | * endianess conversion | |
210 | */ | |
211 | static u_char nand_read_byte16(struct mtd_info *mtd) | |
212 | { | |
213 | struct nand_chip *this = mtd->priv; | |
214 | return (u_char) cpu_to_le16(readw(this->IO_ADDR_R)); | |
215 | } | |
216 | ||
217 | /** | |
218 | * nand_write_byte16 - [DEFAULT] write one byte endianess aware to the chip | |
219 | * @mtd: MTD device structure | |
220 | * @byte: pointer to data byte to write | |
221 | * | |
222 | * Default write function for 16bit buswith with | |
223 | * endianess conversion | |
224 | */ | |
225 | static void nand_write_byte16(struct mtd_info *mtd, u_char byte) | |
226 | { | |
227 | struct nand_chip *this = mtd->priv; | |
228 | writew(le16_to_cpu((u16) byte), this->IO_ADDR_W); | |
229 | } | |
230 | ||
231 | /** | |
232 | * nand_read_word - [DEFAULT] read one word from the chip | |
233 | * @mtd: MTD device structure | |
234 | * | |
235 | * Default read function for 16bit buswith without | |
236 | * endianess conversion | |
237 | */ | |
238 | static u16 nand_read_word(struct mtd_info *mtd) | |
239 | { | |
240 | struct nand_chip *this = mtd->priv; | |
241 | return readw(this->IO_ADDR_R); | |
242 | } | |
243 | ||
244 | /** | |
245 | * nand_write_word - [DEFAULT] write one word to the chip | |
246 | * @mtd: MTD device structure | |
247 | * @word: data word to write | |
248 | * | |
249 | * Default write function for 16bit buswith without | |
250 | * endianess conversion | |
251 | */ | |
252 | static void nand_write_word(struct mtd_info *mtd, u16 word) | |
253 | { | |
254 | struct nand_chip *this = mtd->priv; | |
255 | writew(word, this->IO_ADDR_W); | |
256 | } | |
257 | ||
258 | /** | |
259 | * nand_select_chip - [DEFAULT] control CE line | |
260 | * @mtd: MTD device structure | |
261 | * @chip: chipnumber to select, -1 for deselect | |
262 | * | |
263 | * Default select function for 1 chip devices. | |
264 | */ | |
265 | static void nand_select_chip(struct mtd_info *mtd, int chip) | |
266 | { | |
267 | struct nand_chip *this = mtd->priv; | |
268 | switch(chip) { | |
269 | case -1: | |
270 | this->hwcontrol(mtd, NAND_CTL_CLRNCE); | |
271 | break; | |
272 | case 0: | |
273 | this->hwcontrol(mtd, NAND_CTL_SETNCE); | |
274 | break; | |
275 | ||
276 | default: | |
277 | BUG(); | |
278 | } | |
279 | } | |
280 | ||
281 | /** | |
282 | * nand_write_buf - [DEFAULT] write buffer to chip | |
283 | * @mtd: MTD device structure | |
284 | * @buf: data buffer | |
285 | * @len: number of bytes to write | |
286 | * | |
287 | * Default write function for 8bit buswith | |
288 | */ | |
289 | static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) | |
290 | { | |
291 | int i; | |
292 | struct nand_chip *this = mtd->priv; | |
293 | ||
294 | for (i=0; i<len; i++) | |
295 | writeb(buf[i], this->IO_ADDR_W); | |
296 | } | |
297 | ||
298 | /** | |
299 | * nand_read_buf - [DEFAULT] read chip data into buffer | |
300 | * @mtd: MTD device structure | |
301 | * @buf: buffer to store date | |
302 | * @len: number of bytes to read | |
303 | * | |
304 | * Default read function for 8bit buswith | |
305 | */ | |
306 | static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) | |
307 | { | |
308 | int i; | |
309 | struct nand_chip *this = mtd->priv; | |
310 | ||
311 | for (i=0; i<len; i++) | |
312 | buf[i] = readb(this->IO_ADDR_R); | |
313 | } | |
314 | ||
315 | /** | |
316 | * nand_verify_buf - [DEFAULT] Verify chip data against buffer | |
317 | * @mtd: MTD device structure | |
318 | * @buf: buffer containing the data to compare | |
319 | * @len: number of bytes to compare | |
320 | * | |
321 | * Default verify function for 8bit buswith | |
322 | */ | |
323 | static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len) | |
324 | { | |
325 | int i; | |
326 | struct nand_chip *this = mtd->priv; | |
327 | ||
328 | for (i=0; i<len; i++) | |
329 | if (buf[i] != readb(this->IO_ADDR_R)) | |
330 | return -EFAULT; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | /** | |
336 | * nand_write_buf16 - [DEFAULT] write buffer to chip | |
337 | * @mtd: MTD device structure | |
338 | * @buf: data buffer | |
339 | * @len: number of bytes to write | |
340 | * | |
341 | * Default write function for 16bit buswith | |
342 | */ | |
343 | static void nand_write_buf16(struct mtd_info *mtd, const u_char *buf, int len) | |
344 | { | |
345 | int i; | |
346 | struct nand_chip *this = mtd->priv; | |
347 | u16 *p = (u16 *) buf; | |
348 | len >>= 1; | |
349 | ||
350 | for (i=0; i<len; i++) | |
351 | writew(p[i], this->IO_ADDR_W); | |
352 | ||
353 | } | |
354 | ||
355 | /** | |
356 | * nand_read_buf16 - [DEFAULT] read chip data into buffer | |
357 | * @mtd: MTD device structure | |
358 | * @buf: buffer to store date | |
359 | * @len: number of bytes to read | |
360 | * | |
361 | * Default read function for 16bit buswith | |
362 | */ | |
363 | static void nand_read_buf16(struct mtd_info *mtd, u_char *buf, int len) | |
364 | { | |
365 | int i; | |
366 | struct nand_chip *this = mtd->priv; | |
367 | u16 *p = (u16 *) buf; | |
368 | len >>= 1; | |
369 | ||
370 | for (i=0; i<len; i++) | |
371 | p[i] = readw(this->IO_ADDR_R); | |
372 | } | |
373 | ||
374 | /** | |
375 | * nand_verify_buf16 - [DEFAULT] Verify chip data against buffer | |
376 | * @mtd: MTD device structure | |
377 | * @buf: buffer containing the data to compare | |
378 | * @len: number of bytes to compare | |
379 | * | |
380 | * Default verify function for 16bit buswith | |
381 | */ | |
382 | static int nand_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len) | |
383 | { | |
384 | int i; | |
385 | struct nand_chip *this = mtd->priv; | |
386 | u16 *p = (u16 *) buf; | |
387 | len >>= 1; | |
388 | ||
389 | for (i=0; i<len; i++) | |
390 | if (p[i] != readw(this->IO_ADDR_R)) | |
391 | return -EFAULT; | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | /** | |
397 | * nand_block_bad - [DEFAULT] Read bad block marker from the chip | |
398 | * @mtd: MTD device structure | |
399 | * @ofs: offset from device start | |
400 | * @getchip: 0, if the chip is already selected | |
401 | * | |
402 | * Check, if the block is bad. | |
403 | */ | |
404 | static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip) | |
405 | { | |
406 | int page, chipnr, res = 0; | |
407 | struct nand_chip *this = mtd->priv; | |
408 | u16 bad; | |
409 | ||
410 | if (getchip) { | |
411 | page = (int)(ofs >> this->page_shift); | |
412 | chipnr = (int)(ofs >> this->chip_shift); | |
413 | ||
414 | /* Grab the lock and see if the device is available */ | |
415 | nand_get_device (this, mtd, FL_READING); | |
416 | ||
417 | /* Select the NAND device */ | |
418 | this->select_chip(mtd, chipnr); | |
419 | } else | |
420 | page = (int) ofs; | |
421 | ||
422 | if (this->options & NAND_BUSWIDTH_16) { | |
423 | this->cmdfunc (mtd, NAND_CMD_READOOB, this->badblockpos & 0xFE, page & this->pagemask); | |
424 | bad = cpu_to_le16(this->read_word(mtd)); | |
425 | if (this->badblockpos & 0x1) | |
426 | bad >>= 1; | |
427 | if ((bad & 0xFF) != 0xff) | |
428 | res = 1; | |
429 | } else { | |
430 | this->cmdfunc (mtd, NAND_CMD_READOOB, this->badblockpos, page & this->pagemask); | |
431 | if (this->read_byte(mtd) != 0xff) | |
432 | res = 1; | |
433 | } | |
434 | ||
435 | if (getchip) { | |
436 | /* Deselect and wake up anyone waiting on the device */ | |
437 | nand_release_device(mtd); | |
438 | } | |
439 | ||
440 | return res; | |
441 | } | |
442 | ||
443 | /** | |
444 | * nand_default_block_markbad - [DEFAULT] mark a block bad | |
445 | * @mtd: MTD device structure | |
446 | * @ofs: offset from device start | |
447 | * | |
448 | * This is the default implementation, which can be overridden by | |
449 | * a hardware specific driver. | |
450 | */ | |
451 | static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
452 | { | |
453 | struct nand_chip *this = mtd->priv; | |
454 | u_char buf[2] = {0, 0}; | |
455 | size_t retlen; | |
456 | int block; | |
457 | ||
458 | /* Get block number */ | |
459 | block = ((int) ofs) >> this->bbt_erase_shift; | |
460 | this->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1); | |
461 | ||
462 | /* Do we have a flash based bad block table ? */ | |
463 | if (this->options & NAND_USE_FLASH_BBT) | |
464 | return nand_update_bbt (mtd, ofs); | |
465 | ||
466 | /* We write two bytes, so we dont have to mess with 16 bit access */ | |
467 | ofs += mtd->oobsize + (this->badblockpos & ~0x01); | |
468 | return nand_write_oob (mtd, ofs , 2, &retlen, buf); | |
469 | } | |
470 | ||
471 | /** | |
472 | * nand_check_wp - [GENERIC] check if the chip is write protected | |
473 | * @mtd: MTD device structure | |
474 | * Check, if the device is write protected | |
475 | * | |
476 | * The function expects, that the device is already selected | |
477 | */ | |
478 | static int nand_check_wp (struct mtd_info *mtd) | |
479 | { | |
480 | struct nand_chip *this = mtd->priv; | |
481 | /* Check the WP bit */ | |
482 | this->cmdfunc (mtd, NAND_CMD_STATUS, -1, -1); | |
a4ab4c5d | 483 | return (this->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1; |
1da177e4 LT |
484 | } |
485 | ||
486 | /** | |
487 | * nand_block_checkbad - [GENERIC] Check if a block is marked bad | |
488 | * @mtd: MTD device structure | |
489 | * @ofs: offset from device start | |
490 | * @getchip: 0, if the chip is already selected | |
491 | * @allowbbt: 1, if its allowed to access the bbt area | |
492 | * | |
493 | * Check, if the block is bad. Either by reading the bad block table or | |
494 | * calling of the scan function. | |
495 | */ | |
496 | static int nand_block_checkbad (struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt) | |
497 | { | |
498 | struct nand_chip *this = mtd->priv; | |
499 | ||
500 | if (!this->bbt) | |
501 | return this->block_bad(mtd, ofs, getchip); | |
502 | ||
503 | /* Return info from the table */ | |
504 | return nand_isbad_bbt (mtd, ofs, allowbbt); | |
505 | } | |
506 | ||
507 | /** | |
508 | * nand_command - [DEFAULT] Send command to NAND device | |
509 | * @mtd: MTD device structure | |
510 | * @command: the command to be sent | |
511 | * @column: the column address for this command, -1 if none | |
512 | * @page_addr: the page address for this command, -1 if none | |
513 | * | |
514 | * Send command to NAND device. This function is used for small page | |
515 | * devices (256/512 Bytes per page) | |
516 | */ | |
517 | static void nand_command (struct mtd_info *mtd, unsigned command, int column, int page_addr) | |
518 | { | |
519 | register struct nand_chip *this = mtd->priv; | |
520 | ||
521 | /* Begin command latch cycle */ | |
522 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
523 | /* | |
524 | * Write out the command to the device. | |
525 | */ | |
526 | if (command == NAND_CMD_SEQIN) { | |
527 | int readcmd; | |
528 | ||
529 | if (column >= mtd->oobblock) { | |
530 | /* OOB area */ | |
531 | column -= mtd->oobblock; | |
532 | readcmd = NAND_CMD_READOOB; | |
533 | } else if (column < 256) { | |
534 | /* First 256 bytes --> READ0 */ | |
535 | readcmd = NAND_CMD_READ0; | |
536 | } else { | |
537 | column -= 256; | |
538 | readcmd = NAND_CMD_READ1; | |
539 | } | |
540 | this->write_byte(mtd, readcmd); | |
541 | } | |
542 | this->write_byte(mtd, command); | |
543 | ||
544 | /* Set ALE and clear CLE to start address cycle */ | |
545 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
546 | ||
547 | if (column != -1 || page_addr != -1) { | |
548 | this->hwcontrol(mtd, NAND_CTL_SETALE); | |
549 | ||
550 | /* Serially input address */ | |
551 | if (column != -1) { | |
552 | /* Adjust columns for 16 bit buswidth */ | |
553 | if (this->options & NAND_BUSWIDTH_16) | |
554 | column >>= 1; | |
555 | this->write_byte(mtd, column); | |
556 | } | |
557 | if (page_addr != -1) { | |
558 | this->write_byte(mtd, (unsigned char) (page_addr & 0xff)); | |
559 | this->write_byte(mtd, (unsigned char) ((page_addr >> 8) & 0xff)); | |
560 | /* One more address cycle for devices > 32MiB */ | |
561 | if (this->chipsize > (32 << 20)) | |
562 | this->write_byte(mtd, (unsigned char) ((page_addr >> 16) & 0x0f)); | |
563 | } | |
564 | /* Latch in address */ | |
565 | this->hwcontrol(mtd, NAND_CTL_CLRALE); | |
566 | } | |
567 | ||
568 | /* | |
569 | * program and erase have their own busy handlers | |
570 | * status and sequential in needs no delay | |
571 | */ | |
572 | switch (command) { | |
573 | ||
574 | case NAND_CMD_PAGEPROG: | |
575 | case NAND_CMD_ERASE1: | |
576 | case NAND_CMD_ERASE2: | |
577 | case NAND_CMD_SEQIN: | |
578 | case NAND_CMD_STATUS: | |
579 | return; | |
580 | ||
581 | case NAND_CMD_RESET: | |
582 | if (this->dev_ready) | |
583 | break; | |
584 | udelay(this->chip_delay); | |
585 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
586 | this->write_byte(mtd, NAND_CMD_STATUS); | |
587 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
a4ab4c5d | 588 | while ( !(this->read_byte(mtd) & NAND_STATUS_READY)); |
1da177e4 LT |
589 | return; |
590 | ||
591 | /* This applies to read commands */ | |
592 | default: | |
593 | /* | |
594 | * If we don't have access to the busy pin, we apply the given | |
595 | * command delay | |
596 | */ | |
597 | if (!this->dev_ready) { | |
598 | udelay (this->chip_delay); | |
599 | return; | |
600 | } | |
601 | } | |
602 | ||
603 | /* Apply this short delay always to ensure that we do wait tWB in | |
604 | * any case on any machine. */ | |
605 | ndelay (100); | |
606 | /* wait until command is processed */ | |
607 | while (!this->dev_ready(mtd)); | |
608 | } | |
609 | ||
610 | /** | |
611 | * nand_command_lp - [DEFAULT] Send command to NAND large page device | |
612 | * @mtd: MTD device structure | |
613 | * @command: the command to be sent | |
614 | * @column: the column address for this command, -1 if none | |
615 | * @page_addr: the page address for this command, -1 if none | |
616 | * | |
617 | * Send command to NAND device. This is the version for the new large page devices | |
618 | * We dont have the seperate regions as we have in the small page devices. | |
619 | * We must emulate NAND_CMD_READOOB to keep the code compatible. | |
620 | * | |
621 | */ | |
622 | static void nand_command_lp (struct mtd_info *mtd, unsigned command, int column, int page_addr) | |
623 | { | |
624 | register struct nand_chip *this = mtd->priv; | |
625 | ||
626 | /* Emulate NAND_CMD_READOOB */ | |
627 | if (command == NAND_CMD_READOOB) { | |
628 | column += mtd->oobblock; | |
629 | command = NAND_CMD_READ0; | |
630 | } | |
631 | ||
632 | ||
633 | /* Begin command latch cycle */ | |
634 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
635 | /* Write out the command to the device. */ | |
30f464b7 | 636 | this->write_byte(mtd, (command & 0xff)); |
1da177e4 LT |
637 | /* End command latch cycle */ |
638 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
639 | ||
640 | if (column != -1 || page_addr != -1) { | |
641 | this->hwcontrol(mtd, NAND_CTL_SETALE); | |
642 | ||
643 | /* Serially input address */ | |
644 | if (column != -1) { | |
645 | /* Adjust columns for 16 bit buswidth */ | |
646 | if (this->options & NAND_BUSWIDTH_16) | |
647 | column >>= 1; | |
648 | this->write_byte(mtd, column & 0xff); | |
649 | this->write_byte(mtd, column >> 8); | |
650 | } | |
651 | if (page_addr != -1) { | |
652 | this->write_byte(mtd, (unsigned char) (page_addr & 0xff)); | |
653 | this->write_byte(mtd, (unsigned char) ((page_addr >> 8) & 0xff)); | |
654 | /* One more address cycle for devices > 128MiB */ | |
655 | if (this->chipsize > (128 << 20)) | |
656 | this->write_byte(mtd, (unsigned char) ((page_addr >> 16) & 0xff)); | |
657 | } | |
658 | /* Latch in address */ | |
659 | this->hwcontrol(mtd, NAND_CTL_CLRALE); | |
660 | } | |
661 | ||
662 | /* | |
663 | * program and erase have their own busy handlers | |
30f464b7 DM |
664 | * status, sequential in, and deplete1 need no delay |
665 | */ | |
1da177e4 LT |
666 | switch (command) { |
667 | ||
668 | case NAND_CMD_CACHEDPROG: | |
669 | case NAND_CMD_PAGEPROG: | |
670 | case NAND_CMD_ERASE1: | |
671 | case NAND_CMD_ERASE2: | |
672 | case NAND_CMD_SEQIN: | |
673 | case NAND_CMD_STATUS: | |
30f464b7 | 674 | case NAND_CMD_DEPLETE1: |
1da177e4 LT |
675 | return; |
676 | ||
30f464b7 DM |
677 | /* |
678 | * read error status commands require only a short delay | |
679 | */ | |
680 | case NAND_CMD_STATUS_ERROR: | |
681 | case NAND_CMD_STATUS_ERROR0: | |
682 | case NAND_CMD_STATUS_ERROR1: | |
683 | case NAND_CMD_STATUS_ERROR2: | |
684 | case NAND_CMD_STATUS_ERROR3: | |
685 | udelay(this->chip_delay); | |
686 | return; | |
1da177e4 LT |
687 | |
688 | case NAND_CMD_RESET: | |
689 | if (this->dev_ready) | |
690 | break; | |
691 | udelay(this->chip_delay); | |
692 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
693 | this->write_byte(mtd, NAND_CMD_STATUS); | |
694 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
a4ab4c5d | 695 | while ( !(this->read_byte(mtd) & NAND_STATUS_READY)); |
1da177e4 LT |
696 | return; |
697 | ||
698 | case NAND_CMD_READ0: | |
699 | /* Begin command latch cycle */ | |
700 | this->hwcontrol(mtd, NAND_CTL_SETCLE); | |
701 | /* Write out the start read command */ | |
702 | this->write_byte(mtd, NAND_CMD_READSTART); | |
703 | /* End command latch cycle */ | |
704 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); | |
705 | /* Fall through into ready check */ | |
706 | ||
707 | /* This applies to read commands */ | |
708 | default: | |
709 | /* | |
710 | * If we don't have access to the busy pin, we apply the given | |
711 | * command delay | |
712 | */ | |
713 | if (!this->dev_ready) { | |
714 | udelay (this->chip_delay); | |
715 | return; | |
716 | } | |
717 | } | |
718 | ||
719 | /* Apply this short delay always to ensure that we do wait tWB in | |
720 | * any case on any machine. */ | |
721 | ndelay (100); | |
722 | /* wait until command is processed */ | |
723 | while (!this->dev_ready(mtd)); | |
724 | } | |
725 | ||
726 | /** | |
727 | * nand_get_device - [GENERIC] Get chip for selected access | |
728 | * @this: the nand chip descriptor | |
729 | * @mtd: MTD device structure | |
730 | * @new_state: the state which is requested | |
731 | * | |
732 | * Get the device and lock it for exclusive access | |
733 | */ | |
734 | static void nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state) | |
735 | { | |
736 | struct nand_chip *active = this; | |
737 | ||
738 | DECLARE_WAITQUEUE (wait, current); | |
739 | ||
740 | /* | |
741 | * Grab the lock and see if the device is available | |
742 | */ | |
743 | retry: | |
744 | /* Hardware controller shared among independend devices */ | |
745 | if (this->controller) { | |
746 | spin_lock (&this->controller->lock); | |
747 | if (this->controller->active) | |
748 | active = this->controller->active; | |
749 | else | |
750 | this->controller->active = this; | |
751 | spin_unlock (&this->controller->lock); | |
752 | } | |
753 | ||
754 | if (active == this) { | |
755 | spin_lock (&this->chip_lock); | |
756 | if (this->state == FL_READY) { | |
757 | this->state = new_state; | |
758 | spin_unlock (&this->chip_lock); | |
759 | return; | |
760 | } | |
761 | } | |
762 | set_current_state (TASK_UNINTERRUPTIBLE); | |
763 | add_wait_queue (&active->wq, &wait); | |
764 | spin_unlock (&active->chip_lock); | |
765 | schedule (); | |
766 | remove_wait_queue (&active->wq, &wait); | |
767 | goto retry; | |
768 | } | |
769 | ||
770 | /** | |
771 | * nand_wait - [DEFAULT] wait until the command is done | |
772 | * @mtd: MTD device structure | |
773 | * @this: NAND chip structure | |
774 | * @state: state to select the max. timeout value | |
775 | * | |
776 | * Wait for command done. This applies to erase and program only | |
777 | * Erase can take up to 400ms and program up to 20ms according to | |
778 | * general NAND and SmartMedia specs | |
779 | * | |
780 | */ | |
781 | static int nand_wait(struct mtd_info *mtd, struct nand_chip *this, int state) | |
782 | { | |
783 | ||
784 | unsigned long timeo = jiffies; | |
785 | int status; | |
786 | ||
787 | if (state == FL_ERASING) | |
788 | timeo += (HZ * 400) / 1000; | |
789 | else | |
790 | timeo += (HZ * 20) / 1000; | |
791 | ||
792 | /* Apply this short delay always to ensure that we do wait tWB in | |
793 | * any case on any machine. */ | |
794 | ndelay (100); | |
795 | ||
796 | if ((state == FL_ERASING) && (this->options & NAND_IS_AND)) | |
797 | this->cmdfunc (mtd, NAND_CMD_STATUS_MULTI, -1, -1); | |
798 | else | |
799 | this->cmdfunc (mtd, NAND_CMD_STATUS, -1, -1); | |
800 | ||
801 | while (time_before(jiffies, timeo)) { | |
802 | /* Check, if we were interrupted */ | |
803 | if (this->state != state) | |
804 | return 0; | |
805 | ||
806 | if (this->dev_ready) { | |
807 | if (this->dev_ready(mtd)) | |
808 | break; | |
809 | } else { | |
810 | if (this->read_byte(mtd) & NAND_STATUS_READY) | |
811 | break; | |
812 | } | |
15266bb7 | 813 | msleep(1); |
1da177e4 LT |
814 | } |
815 | status = (int) this->read_byte(mtd); | |
816 | return status; | |
817 | } | |
818 | ||
819 | /** | |
820 | * nand_write_page - [GENERIC] write one page | |
821 | * @mtd: MTD device structure | |
822 | * @this: NAND chip structure | |
823 | * @page: startpage inside the chip, must be called with (page & this->pagemask) | |
824 | * @oob_buf: out of band data buffer | |
825 | * @oobsel: out of band selecttion structre | |
826 | * @cached: 1 = enable cached programming if supported by chip | |
827 | * | |
828 | * Nand_page_program function is used for write and writev ! | |
829 | * This function will always program a full page of data | |
830 | * If you call it with a non page aligned buffer, you're lost :) | |
831 | * | |
832 | * Cached programming is not supported yet. | |
833 | */ | |
834 | static int nand_write_page (struct mtd_info *mtd, struct nand_chip *this, int page, | |
835 | u_char *oob_buf, struct nand_oobinfo *oobsel, int cached) | |
836 | { | |
837 | int i, status; | |
838 | u_char ecc_code[32]; | |
839 | int eccmode = oobsel->useecc ? this->eccmode : NAND_ECC_NONE; | |
840 | int *oob_config = oobsel->eccpos; | |
841 | int datidx = 0, eccidx = 0, eccsteps = this->eccsteps; | |
842 | int eccbytes = 0; | |
843 | ||
844 | /* FIXME: Enable cached programming */ | |
845 | cached = 0; | |
846 | ||
847 | /* Send command to begin auto page programming */ | |
848 | this->cmdfunc (mtd, NAND_CMD_SEQIN, 0x00, page); | |
849 | ||
850 | /* Write out complete page of data, take care of eccmode */ | |
851 | switch (eccmode) { | |
852 | /* No ecc, write all */ | |
853 | case NAND_ECC_NONE: | |
854 | printk (KERN_WARNING "Writing data without ECC to NAND-FLASH is not recommended\n"); | |
855 | this->write_buf(mtd, this->data_poi, mtd->oobblock); | |
856 | break; | |
857 | ||
858 | /* Software ecc 3/256, write all */ | |
859 | case NAND_ECC_SOFT: | |
860 | for (; eccsteps; eccsteps--) { | |
861 | this->calculate_ecc(mtd, &this->data_poi[datidx], ecc_code); | |
862 | for (i = 0; i < 3; i++, eccidx++) | |
863 | oob_buf[oob_config[eccidx]] = ecc_code[i]; | |
864 | datidx += this->eccsize; | |
865 | } | |
866 | this->write_buf(mtd, this->data_poi, mtd->oobblock); | |
867 | break; | |
868 | default: | |
869 | eccbytes = this->eccbytes; | |
870 | for (; eccsteps; eccsteps--) { | |
871 | /* enable hardware ecc logic for write */ | |
872 | this->enable_hwecc(mtd, NAND_ECC_WRITE); | |
873 | this->write_buf(mtd, &this->data_poi[datidx], this->eccsize); | |
874 | this->calculate_ecc(mtd, &this->data_poi[datidx], ecc_code); | |
875 | for (i = 0; i < eccbytes; i++, eccidx++) | |
876 | oob_buf[oob_config[eccidx]] = ecc_code[i]; | |
877 | /* If the hardware ecc provides syndromes then | |
878 | * the ecc code must be written immidiately after | |
879 | * the data bytes (words) */ | |
880 | if (this->options & NAND_HWECC_SYNDROME) | |
881 | this->write_buf(mtd, ecc_code, eccbytes); | |
882 | datidx += this->eccsize; | |
883 | } | |
884 | break; | |
885 | } | |
886 | ||
887 | /* Write out OOB data */ | |
888 | if (this->options & NAND_HWECC_SYNDROME) | |
889 | this->write_buf(mtd, &oob_buf[oobsel->eccbytes], mtd->oobsize - oobsel->eccbytes); | |
890 | else | |
891 | this->write_buf(mtd, oob_buf, mtd->oobsize); | |
892 | ||
893 | /* Send command to actually program the data */ | |
894 | this->cmdfunc (mtd, cached ? NAND_CMD_CACHEDPROG : NAND_CMD_PAGEPROG, -1, -1); | |
895 | ||
896 | if (!cached) { | |
897 | /* call wait ready function */ | |
898 | status = this->waitfunc (mtd, this, FL_WRITING); | |
899 | /* See if device thinks it succeeded */ | |
a4ab4c5d | 900 | if (status & NAND_STATUS_FAIL) { |
1da177e4 LT |
901 | DEBUG (MTD_DEBUG_LEVEL0, "%s: " "Failed write, page 0x%08x, ", __FUNCTION__, page); |
902 | return -EIO; | |
903 | } | |
904 | } else { | |
905 | /* FIXME: Implement cached programming ! */ | |
906 | /* wait until cache is ready*/ | |
907 | // status = this->waitfunc (mtd, this, FL_CACHEDRPG); | |
908 | } | |
909 | return 0; | |
910 | } | |
911 | ||
912 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE | |
913 | /** | |
914 | * nand_verify_pages - [GENERIC] verify the chip contents after a write | |
915 | * @mtd: MTD device structure | |
916 | * @this: NAND chip structure | |
917 | * @page: startpage inside the chip, must be called with (page & this->pagemask) | |
918 | * @numpages: number of pages to verify | |
919 | * @oob_buf: out of band data buffer | |
920 | * @oobsel: out of band selecttion structre | |
921 | * @chipnr: number of the current chip | |
922 | * @oobmode: 1 = full buffer verify, 0 = ecc only | |
923 | * | |
924 | * The NAND device assumes that it is always writing to a cleanly erased page. | |
925 | * Hence, it performs its internal write verification only on bits that | |
926 | * transitioned from 1 to 0. The device does NOT verify the whole page on a | |
927 | * byte by byte basis. It is possible that the page was not completely erased | |
928 | * or the page is becoming unusable due to wear. The read with ECC would catch | |
929 | * the error later when the ECC page check fails, but we would rather catch | |
930 | * it early in the page write stage. Better to write no data than invalid data. | |
931 | */ | |
932 | static int nand_verify_pages (struct mtd_info *mtd, struct nand_chip *this, int page, int numpages, | |
933 | u_char *oob_buf, struct nand_oobinfo *oobsel, int chipnr, int oobmode) | |
934 | { | |
935 | int i, j, datidx = 0, oobofs = 0, res = -EIO; | |
936 | int eccsteps = this->eccsteps; | |
937 | int hweccbytes; | |
938 | u_char oobdata[64]; | |
939 | ||
940 | hweccbytes = (this->options & NAND_HWECC_SYNDROME) ? (oobsel->eccbytes / eccsteps) : 0; | |
941 | ||
942 | /* Send command to read back the first page */ | |
943 | this->cmdfunc (mtd, NAND_CMD_READ0, 0, page); | |
944 | ||
945 | for(;;) { | |
946 | for (j = 0; j < eccsteps; j++) { | |
947 | /* Loop through and verify the data */ | |
948 | if (this->verify_buf(mtd, &this->data_poi[datidx], mtd->eccsize)) { | |
949 | DEBUG (MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); | |
950 | goto out; | |
951 | } | |
952 | datidx += mtd->eccsize; | |
953 | /* Have we a hw generator layout ? */ | |
954 | if (!hweccbytes) | |
955 | continue; | |
956 | if (this->verify_buf(mtd, &this->oob_buf[oobofs], hweccbytes)) { | |
957 | DEBUG (MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); | |
958 | goto out; | |
959 | } | |
960 | oobofs += hweccbytes; | |
961 | } | |
962 | ||
963 | /* check, if we must compare all data or if we just have to | |
964 | * compare the ecc bytes | |
965 | */ | |
966 | if (oobmode) { | |
967 | if (this->verify_buf(mtd, &oob_buf[oobofs], mtd->oobsize - hweccbytes * eccsteps)) { | |
968 | DEBUG (MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); | |
969 | goto out; | |
970 | } | |
971 | } else { | |
972 | /* Read always, else autoincrement fails */ | |
973 | this->read_buf(mtd, oobdata, mtd->oobsize - hweccbytes * eccsteps); | |
974 | ||
975 | if (oobsel->useecc != MTD_NANDECC_OFF && !hweccbytes) { | |
976 | int ecccnt = oobsel->eccbytes; | |
977 | ||
978 | for (i = 0; i < ecccnt; i++) { | |
979 | int idx = oobsel->eccpos[i]; | |
980 | if (oobdata[idx] != oob_buf[oobofs + idx] ) { | |
981 | DEBUG (MTD_DEBUG_LEVEL0, | |
982 | "%s: Failed ECC write " | |
983 | "verify, page 0x%08x, " "%6i bytes were succesful\n", __FUNCTION__, page, i); | |
984 | goto out; | |
985 | } | |
986 | } | |
987 | } | |
988 | } | |
989 | oobofs += mtd->oobsize - hweccbytes * eccsteps; | |
990 | page++; | |
991 | numpages--; | |
992 | ||
993 | /* Apply delay or wait for ready/busy pin | |
994 | * Do this before the AUTOINCR check, so no problems | |
995 | * arise if a chip which does auto increment | |
996 | * is marked as NOAUTOINCR by the board driver. | |
997 | * Do this also before returning, so the chip is | |
998 | * ready for the next command. | |
999 | */ | |
1000 | if (!this->dev_ready) | |
1001 | udelay (this->chip_delay); | |
1002 | else | |
1003 | while (!this->dev_ready(mtd)); | |
1004 | ||
1005 | /* All done, return happy */ | |
1006 | if (!numpages) | |
1007 | return 0; | |
1008 | ||
1009 | ||
1010 | /* Check, if the chip supports auto page increment */ | |
1011 | if (!NAND_CANAUTOINCR(this)) | |
1012 | this->cmdfunc (mtd, NAND_CMD_READ0, 0x00, page); | |
1013 | } | |
1014 | /* | |
1015 | * Terminate the read command. We come here in case of an error | |
1016 | * So we must issue a reset command. | |
1017 | */ | |
1018 | out: | |
1019 | this->cmdfunc (mtd, NAND_CMD_RESET, -1, -1); | |
1020 | return res; | |
1021 | } | |
1022 | #endif | |
1023 | ||
1024 | /** | |
1025 | * nand_read - [MTD Interface] MTD compability function for nand_read_ecc | |
1026 | * @mtd: MTD device structure | |
1027 | * @from: offset to read from | |
1028 | * @len: number of bytes to read | |
1029 | * @retlen: pointer to variable to store the number of read bytes | |
1030 | * @buf: the databuffer to put data | |
1031 | * | |
1032 | * This function simply calls nand_read_ecc with oob buffer and oobsel = NULL | |
1033 | */ | |
1034 | static int nand_read (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf) | |
1035 | { | |
1036 | return nand_read_ecc (mtd, from, len, retlen, buf, NULL, NULL); | |
1037 | } | |
1038 | ||
1039 | ||
1040 | /** | |
1041 | * nand_read_ecc - [MTD Interface] Read data with ECC | |
1042 | * @mtd: MTD device structure | |
1043 | * @from: offset to read from | |
1044 | * @len: number of bytes to read | |
1045 | * @retlen: pointer to variable to store the number of read bytes | |
1046 | * @buf: the databuffer to put data | |
1047 | * @oob_buf: filesystem supplied oob data buffer | |
1048 | * @oobsel: oob selection structure | |
1049 | * | |
1050 | * NAND read with ECC | |
1051 | */ | |
1052 | static int nand_read_ecc (struct mtd_info *mtd, loff_t from, size_t len, | |
1053 | size_t * retlen, u_char * buf, u_char * oob_buf, struct nand_oobinfo *oobsel) | |
1054 | { | |
1055 | int i, j, col, realpage, page, end, ecc, chipnr, sndcmd = 1; | |
1056 | int read = 0, oob = 0, ecc_status = 0, ecc_failed = 0; | |
1057 | struct nand_chip *this = mtd->priv; | |
1058 | u_char *data_poi, *oob_data = oob_buf; | |
1059 | u_char ecc_calc[32]; | |
1060 | u_char ecc_code[32]; | |
1061 | int eccmode, eccsteps; | |
1062 | int *oob_config, datidx; | |
1063 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; | |
1064 | int eccbytes; | |
1065 | int compareecc = 1; | |
1066 | int oobreadlen; | |
1067 | ||
1068 | ||
1069 | DEBUG (MTD_DEBUG_LEVEL3, "nand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len); | |
1070 | ||
1071 | /* Do not allow reads past end of device */ | |
1072 | if ((from + len) > mtd->size) { | |
1073 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_ecc: Attempt read beyond end of device\n"); | |
1074 | *retlen = 0; | |
1075 | return -EINVAL; | |
1076 | } | |
1077 | ||
1078 | /* Grab the lock and see if the device is available */ | |
30f464b7 | 1079 | nand_get_device (this, mtd, FL_READING); |
1da177e4 LT |
1080 | |
1081 | /* use userspace supplied oobinfo, if zero */ | |
1082 | if (oobsel == NULL) | |
1083 | oobsel = &mtd->oobinfo; | |
1084 | ||
1085 | /* Autoplace of oob data ? Use the default placement scheme */ | |
1086 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) | |
1087 | oobsel = this->autooob; | |
1088 | ||
1089 | eccmode = oobsel->useecc ? this->eccmode : NAND_ECC_NONE; | |
1090 | oob_config = oobsel->eccpos; | |
1091 | ||
1092 | /* Select the NAND device */ | |
1093 | chipnr = (int)(from >> this->chip_shift); | |
1094 | this->select_chip(mtd, chipnr); | |
1095 | ||
1096 | /* First we calculate the starting page */ | |
1097 | realpage = (int) (from >> this->page_shift); | |
1098 | page = realpage & this->pagemask; | |
1099 | ||
1100 | /* Get raw starting column */ | |
1101 | col = from & (mtd->oobblock - 1); | |
1102 | ||
1103 | end = mtd->oobblock; | |
1104 | ecc = this->eccsize; | |
1105 | eccbytes = this->eccbytes; | |
1106 | ||
1107 | if ((eccmode == NAND_ECC_NONE) || (this->options & NAND_HWECC_SYNDROME)) | |
1108 | compareecc = 0; | |
1109 | ||
1110 | oobreadlen = mtd->oobsize; | |
1111 | if (this->options & NAND_HWECC_SYNDROME) | |
1112 | oobreadlen -= oobsel->eccbytes; | |
1113 | ||
1114 | /* Loop until all data read */ | |
1115 | while (read < len) { | |
1116 | ||
1117 | int aligned = (!col && (len - read) >= end); | |
1118 | /* | |
1119 | * If the read is not page aligned, we have to read into data buffer | |
1120 | * due to ecc, else we read into return buffer direct | |
1121 | */ | |
1122 | if (aligned) | |
1123 | data_poi = &buf[read]; | |
1124 | else | |
1125 | data_poi = this->data_buf; | |
1126 | ||
1127 | /* Check, if we have this page in the buffer | |
1128 | * | |
1129 | * FIXME: Make it work when we must provide oob data too, | |
1130 | * check the usage of data_buf oob field | |
1131 | */ | |
1132 | if (realpage == this->pagebuf && !oob_buf) { | |
1133 | /* aligned read ? */ | |
1134 | if (aligned) | |
1135 | memcpy (data_poi, this->data_buf, end); | |
1136 | goto readdata; | |
1137 | } | |
1138 | ||
1139 | /* Check, if we must send the read command */ | |
1140 | if (sndcmd) { | |
1141 | this->cmdfunc (mtd, NAND_CMD_READ0, 0x00, page); | |
1142 | sndcmd = 0; | |
1143 | } | |
1144 | ||
1145 | /* get oob area, if we have no oob buffer from fs-driver */ | |
1146 | if (!oob_buf || oobsel->useecc == MTD_NANDECC_AUTOPLACE) | |
1147 | oob_data = &this->data_buf[end]; | |
1148 | ||
1149 | eccsteps = this->eccsteps; | |
1150 | ||
1151 | switch (eccmode) { | |
1152 | case NAND_ECC_NONE: { /* No ECC, Read in a page */ | |
1153 | static unsigned long lastwhinge = 0; | |
1154 | if ((lastwhinge / HZ) != (jiffies / HZ)) { | |
1155 | printk (KERN_WARNING "Reading data from NAND FLASH without ECC is not recommended\n"); | |
1156 | lastwhinge = jiffies; | |
1157 | } | |
1158 | this->read_buf(mtd, data_poi, end); | |
1159 | break; | |
1160 | } | |
1161 | ||
1162 | case NAND_ECC_SOFT: /* Software ECC 3/256: Read in a page + oob data */ | |
1163 | this->read_buf(mtd, data_poi, end); | |
1164 | for (i = 0, datidx = 0; eccsteps; eccsteps--, i+=3, datidx += ecc) | |
1165 | this->calculate_ecc(mtd, &data_poi[datidx], &ecc_calc[i]); | |
1166 | break; | |
1167 | ||
1168 | default: | |
1169 | for (i = 0, datidx = 0; eccsteps; eccsteps--, i+=eccbytes, datidx += ecc) { | |
1170 | this->enable_hwecc(mtd, NAND_ECC_READ); | |
1171 | this->read_buf(mtd, &data_poi[datidx], ecc); | |
1172 | ||
1173 | /* HW ecc with syndrome calculation must read the | |
1174 | * syndrome from flash immidiately after the data */ | |
1175 | if (!compareecc) { | |
1176 | /* Some hw ecc generators need to know when the | |
1177 | * syndrome is read from flash */ | |
1178 | this->enable_hwecc(mtd, NAND_ECC_READSYN); | |
1179 | this->read_buf(mtd, &oob_data[i], eccbytes); | |
1180 | /* We calc error correction directly, it checks the hw | |
1181 | * generator for an error, reads back the syndrome and | |
1182 | * does the error correction on the fly */ | |
1183 | if (this->correct_data(mtd, &data_poi[datidx], &oob_data[i], &ecc_code[i]) == -1) { | |
1184 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_ecc: " | |
1185 | "Failed ECC read, page 0x%08x on chip %d\n", page, chipnr); | |
1186 | ecc_failed++; | |
1187 | } | |
1188 | } else { | |
1189 | this->calculate_ecc(mtd, &data_poi[datidx], &ecc_calc[i]); | |
1190 | } | |
1191 | } | |
1192 | break; | |
1193 | } | |
1194 | ||
1195 | /* read oobdata */ | |
1196 | this->read_buf(mtd, &oob_data[mtd->oobsize - oobreadlen], oobreadlen); | |
1197 | ||
1198 | /* Skip ECC check, if not requested (ECC_NONE or HW_ECC with syndromes) */ | |
1199 | if (!compareecc) | |
1200 | goto readoob; | |
1201 | ||
1202 | /* Pick the ECC bytes out of the oob data */ | |
1203 | for (j = 0; j < oobsel->eccbytes; j++) | |
1204 | ecc_code[j] = oob_data[oob_config[j]]; | |
1205 | ||
1206 | /* correct data, if neccecary */ | |
1207 | for (i = 0, j = 0, datidx = 0; i < this->eccsteps; i++, datidx += ecc) { | |
1208 | ecc_status = this->correct_data(mtd, &data_poi[datidx], &ecc_code[j], &ecc_calc[j]); | |
1209 | ||
1210 | /* Get next chunk of ecc bytes */ | |
1211 | j += eccbytes; | |
1212 | ||
1213 | /* Check, if we have a fs supplied oob-buffer, | |
1214 | * This is the legacy mode. Used by YAFFS1 | |
1215 | * Should go away some day | |
1216 | */ | |
1217 | if (oob_buf && oobsel->useecc == MTD_NANDECC_PLACE) { | |
1218 | int *p = (int *)(&oob_data[mtd->oobsize]); | |
1219 | p[i] = ecc_status; | |
1220 | } | |
1221 | ||
1222 | if (ecc_status == -1) { | |
1223 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_ecc: " "Failed ECC read, page 0x%08x\n", page); | |
1224 | ecc_failed++; | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | readoob: | |
1229 | /* check, if we have a fs supplied oob-buffer */ | |
1230 | if (oob_buf) { | |
1231 | /* without autoplace. Legacy mode used by YAFFS1 */ | |
1232 | switch(oobsel->useecc) { | |
1233 | case MTD_NANDECC_AUTOPLACE: | |
1234 | /* Walk through the autoplace chunks */ | |
1235 | for (i = 0, j = 0; j < mtd->oobavail; i++) { | |
1236 | int from = oobsel->oobfree[i][0]; | |
1237 | int num = oobsel->oobfree[i][1]; | |
1238 | memcpy(&oob_buf[oob], &oob_data[from], num); | |
1239 | j+= num; | |
1240 | } | |
1241 | oob += mtd->oobavail; | |
1242 | break; | |
1243 | case MTD_NANDECC_PLACE: | |
1244 | /* YAFFS1 legacy mode */ | |
1245 | oob_data += this->eccsteps * sizeof (int); | |
1246 | default: | |
1247 | oob_data += mtd->oobsize; | |
1248 | } | |
1249 | } | |
1250 | readdata: | |
1251 | /* Partial page read, transfer data into fs buffer */ | |
1252 | if (!aligned) { | |
1253 | for (j = col; j < end && read < len; j++) | |
1254 | buf[read++] = data_poi[j]; | |
1255 | this->pagebuf = realpage; | |
1256 | } else | |
1257 | read += mtd->oobblock; | |
1258 | ||
1259 | /* Apply delay or wait for ready/busy pin | |
1260 | * Do this before the AUTOINCR check, so no problems | |
1261 | * arise if a chip which does auto increment | |
1262 | * is marked as NOAUTOINCR by the board driver. | |
1263 | */ | |
1264 | if (!this->dev_ready) | |
1265 | udelay (this->chip_delay); | |
1266 | else | |
1267 | while (!this->dev_ready(mtd)); | |
1268 | ||
1269 | if (read == len) | |
1270 | break; | |
1271 | ||
1272 | /* For subsequent reads align to page boundary. */ | |
1273 | col = 0; | |
1274 | /* Increment page address */ | |
1275 | realpage++; | |
1276 | ||
1277 | page = realpage & this->pagemask; | |
1278 | /* Check, if we cross a chip boundary */ | |
1279 | if (!page) { | |
1280 | chipnr++; | |
1281 | this->select_chip(mtd, -1); | |
1282 | this->select_chip(mtd, chipnr); | |
1283 | } | |
1284 | /* Check, if the chip supports auto page increment | |
1285 | * or if we have hit a block boundary. | |
1286 | */ | |
1287 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) | |
1288 | sndcmd = 1; | |
1289 | } | |
1290 | ||
1291 | /* Deselect and wake up anyone waiting on the device */ | |
1292 | nand_release_device(mtd); | |
1293 | ||
1294 | /* | |
1295 | * Return success, if no ECC failures, else -EBADMSG | |
1296 | * fs driver will take care of that, because | |
1297 | * retlen == desired len and result == -EBADMSG | |
1298 | */ | |
1299 | *retlen = read; | |
1300 | return ecc_failed ? -EBADMSG : 0; | |
1301 | } | |
1302 | ||
1303 | /** | |
1304 | * nand_read_oob - [MTD Interface] NAND read out-of-band | |
1305 | * @mtd: MTD device structure | |
1306 | * @from: offset to read from | |
1307 | * @len: number of bytes to read | |
1308 | * @retlen: pointer to variable to store the number of read bytes | |
1309 | * @buf: the databuffer to put data | |
1310 | * | |
1311 | * NAND read out-of-band data from the spare area | |
1312 | */ | |
1313 | static int nand_read_oob (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf) | |
1314 | { | |
1315 | int i, col, page, chipnr; | |
1316 | struct nand_chip *this = mtd->priv; | |
1317 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; | |
1318 | ||
1319 | DEBUG (MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len); | |
1320 | ||
1321 | /* Shift to get page */ | |
1322 | page = (int)(from >> this->page_shift); | |
1323 | chipnr = (int)(from >> this->chip_shift); | |
1324 | ||
1325 | /* Mask to get column */ | |
1326 | col = from & (mtd->oobsize - 1); | |
1327 | ||
1328 | /* Initialize return length value */ | |
1329 | *retlen = 0; | |
1330 | ||
1331 | /* Do not allow reads past end of device */ | |
1332 | if ((from + len) > mtd->size) { | |
1333 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_oob: Attempt read beyond end of device\n"); | |
1334 | *retlen = 0; | |
1335 | return -EINVAL; | |
1336 | } | |
1337 | ||
1338 | /* Grab the lock and see if the device is available */ | |
1339 | nand_get_device (this, mtd , FL_READING); | |
1340 | ||
1341 | /* Select the NAND device */ | |
1342 | this->select_chip(mtd, chipnr); | |
1343 | ||
1344 | /* Send the read command */ | |
1345 | this->cmdfunc (mtd, NAND_CMD_READOOB, col, page & this->pagemask); | |
1346 | /* | |
1347 | * Read the data, if we read more than one page | |
1348 | * oob data, let the device transfer the data ! | |
1349 | */ | |
1350 | i = 0; | |
1351 | while (i < len) { | |
1352 | int thislen = mtd->oobsize - col; | |
1353 | thislen = min_t(int, thislen, len); | |
1354 | this->read_buf(mtd, &buf[i], thislen); | |
1355 | i += thislen; | |
1356 | ||
1357 | /* Apply delay or wait for ready/busy pin | |
1358 | * Do this before the AUTOINCR check, so no problems | |
1359 | * arise if a chip which does auto increment | |
1360 | * is marked as NOAUTOINCR by the board driver. | |
1361 | */ | |
1362 | if (!this->dev_ready) | |
1363 | udelay (this->chip_delay); | |
1364 | else | |
1365 | while (!this->dev_ready(mtd)); | |
1366 | ||
1367 | /* Read more ? */ | |
1368 | if (i < len) { | |
1369 | page++; | |
1370 | col = 0; | |
1371 | ||
1372 | /* Check, if we cross a chip boundary */ | |
1373 | if (!(page & this->pagemask)) { | |
1374 | chipnr++; | |
1375 | this->select_chip(mtd, -1); | |
1376 | this->select_chip(mtd, chipnr); | |
1377 | } | |
1378 | ||
1379 | /* Check, if the chip supports auto page increment | |
1380 | * or if we have hit a block boundary. | |
1381 | */ | |
1382 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) { | |
1383 | /* For subsequent page reads set offset to 0 */ | |
1384 | this->cmdfunc (mtd, NAND_CMD_READOOB, 0x0, page & this->pagemask); | |
1385 | } | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | /* Deselect and wake up anyone waiting on the device */ | |
1390 | nand_release_device(mtd); | |
1391 | ||
1392 | /* Return happy */ | |
1393 | *retlen = len; | |
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | /** | |
1398 | * nand_read_raw - [GENERIC] Read raw data including oob into buffer | |
1399 | * @mtd: MTD device structure | |
1400 | * @buf: temporary buffer | |
1401 | * @from: offset to read from | |
1402 | * @len: number of bytes to read | |
1403 | * @ooblen: number of oob data bytes to read | |
1404 | * | |
1405 | * Read raw data including oob into buffer | |
1406 | */ | |
1407 | int nand_read_raw (struct mtd_info *mtd, uint8_t *buf, loff_t from, size_t len, size_t ooblen) | |
1408 | { | |
1409 | struct nand_chip *this = mtd->priv; | |
1410 | int page = (int) (from >> this->page_shift); | |
1411 | int chip = (int) (from >> this->chip_shift); | |
1412 | int sndcmd = 1; | |
1413 | int cnt = 0; | |
1414 | int pagesize = mtd->oobblock + mtd->oobsize; | |
1415 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; | |
1416 | ||
1417 | /* Do not allow reads past end of device */ | |
1418 | if ((from + len) > mtd->size) { | |
1419 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_raw: Attempt read beyond end of device\n"); | |
1420 | return -EINVAL; | |
1421 | } | |
1422 | ||
1423 | /* Grab the lock and see if the device is available */ | |
1424 | nand_get_device (this, mtd , FL_READING); | |
1425 | ||
1426 | this->select_chip (mtd, chip); | |
1427 | ||
1428 | /* Add requested oob length */ | |
1429 | len += ooblen; | |
1430 | ||
1431 | while (len) { | |
1432 | if (sndcmd) | |
1433 | this->cmdfunc (mtd, NAND_CMD_READ0, 0, page & this->pagemask); | |
1434 | sndcmd = 0; | |
1435 | ||
1436 | this->read_buf (mtd, &buf[cnt], pagesize); | |
1437 | ||
1438 | len -= pagesize; | |
1439 | cnt += pagesize; | |
1440 | page++; | |
1441 | ||
1442 | if (!this->dev_ready) | |
1443 | udelay (this->chip_delay); | |
1444 | else | |
1445 | while (!this->dev_ready(mtd)); | |
1446 | ||
1447 | /* Check, if the chip supports auto page increment */ | |
1448 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) | |
1449 | sndcmd = 1; | |
1450 | } | |
1451 | ||
1452 | /* Deselect and wake up anyone waiting on the device */ | |
1453 | nand_release_device(mtd); | |
1454 | return 0; | |
1455 | } | |
1456 | ||
1457 | ||
1458 | /** | |
1459 | * nand_prepare_oobbuf - [GENERIC] Prepare the out of band buffer | |
1460 | * @mtd: MTD device structure | |
1461 | * @fsbuf: buffer given by fs driver | |
1462 | * @oobsel: out of band selection structre | |
1463 | * @autoplace: 1 = place given buffer into the oob bytes | |
1464 | * @numpages: number of pages to prepare | |
1465 | * | |
1466 | * Return: | |
1467 | * 1. Filesystem buffer available and autoplacement is off, | |
1468 | * return filesystem buffer | |
1469 | * 2. No filesystem buffer or autoplace is off, return internal | |
1470 | * buffer | |
1471 | * 3. Filesystem buffer is given and autoplace selected | |
1472 | * put data from fs buffer into internal buffer and | |
1473 | * retrun internal buffer | |
1474 | * | |
1475 | * Note: The internal buffer is filled with 0xff. This must | |
1476 | * be done only once, when no autoplacement happens | |
1477 | * Autoplacement sets the buffer dirty flag, which | |
1478 | * forces the 0xff fill before using the buffer again. | |
1479 | * | |
1480 | */ | |
1481 | static u_char * nand_prepare_oobbuf (struct mtd_info *mtd, u_char *fsbuf, struct nand_oobinfo *oobsel, | |
1482 | int autoplace, int numpages) | |
1483 | { | |
1484 | struct nand_chip *this = mtd->priv; | |
1485 | int i, len, ofs; | |
1486 | ||
1487 | /* Zero copy fs supplied buffer */ | |
1488 | if (fsbuf && !autoplace) | |
1489 | return fsbuf; | |
1490 | ||
1491 | /* Check, if the buffer must be filled with ff again */ | |
1492 | if (this->oobdirty) { | |
1493 | memset (this->oob_buf, 0xff, | |
1494 | mtd->oobsize << (this->phys_erase_shift - this->page_shift)); | |
1495 | this->oobdirty = 0; | |
1496 | } | |
1497 | ||
1498 | /* If we have no autoplacement or no fs buffer use the internal one */ | |
1499 | if (!autoplace || !fsbuf) | |
1500 | return this->oob_buf; | |
1501 | ||
1502 | /* Walk through the pages and place the data */ | |
1503 | this->oobdirty = 1; | |
1504 | ofs = 0; | |
1505 | while (numpages--) { | |
1506 | for (i = 0, len = 0; len < mtd->oobavail; i++) { | |
1507 | int to = ofs + oobsel->oobfree[i][0]; | |
1508 | int num = oobsel->oobfree[i][1]; | |
1509 | memcpy (&this->oob_buf[to], fsbuf, num); | |
1510 | len += num; | |
1511 | fsbuf += num; | |
1512 | } | |
1513 | ofs += mtd->oobavail; | |
1514 | } | |
1515 | return this->oob_buf; | |
1516 | } | |
1517 | ||
1518 | #define NOTALIGNED(x) (x & (mtd->oobblock-1)) != 0 | |
1519 | ||
1520 | /** | |
1521 | * nand_write - [MTD Interface] compability function for nand_write_ecc | |
1522 | * @mtd: MTD device structure | |
1523 | * @to: offset to write to | |
1524 | * @len: number of bytes to write | |
1525 | * @retlen: pointer to variable to store the number of written bytes | |
1526 | * @buf: the data to write | |
1527 | * | |
1528 | * This function simply calls nand_write_ecc with oob buffer and oobsel = NULL | |
1529 | * | |
1530 | */ | |
1531 | static int nand_write (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char * buf) | |
1532 | { | |
1533 | return (nand_write_ecc (mtd, to, len, retlen, buf, NULL, NULL)); | |
1534 | } | |
1535 | ||
1536 | /** | |
1537 | * nand_write_ecc - [MTD Interface] NAND write with ECC | |
1538 | * @mtd: MTD device structure | |
1539 | * @to: offset to write to | |
1540 | * @len: number of bytes to write | |
1541 | * @retlen: pointer to variable to store the number of written bytes | |
1542 | * @buf: the data to write | |
1543 | * @eccbuf: filesystem supplied oob data buffer | |
1544 | * @oobsel: oob selection structure | |
1545 | * | |
1546 | * NAND write with ECC | |
1547 | */ | |
1548 | static int nand_write_ecc (struct mtd_info *mtd, loff_t to, size_t len, | |
1549 | size_t * retlen, const u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel) | |
1550 | { | |
1551 | int startpage, page, ret = -EIO, oob = 0, written = 0, chipnr; | |
1552 | int autoplace = 0, numpages, totalpages; | |
1553 | struct nand_chip *this = mtd->priv; | |
1554 | u_char *oobbuf, *bufstart; | |
1555 | int ppblock = (1 << (this->phys_erase_shift - this->page_shift)); | |
1556 | ||
1557 | DEBUG (MTD_DEBUG_LEVEL3, "nand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len); | |
1558 | ||
1559 | /* Initialize retlen, in case of early exit */ | |
1560 | *retlen = 0; | |
1561 | ||
1562 | /* Do not allow write past end of device */ | |
1563 | if ((to + len) > mtd->size) { | |
1564 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: Attempt to write past end of page\n"); | |
1565 | return -EINVAL; | |
1566 | } | |
1567 | ||
1568 | /* reject writes, which are not page aligned */ | |
1569 | if (NOTALIGNED (to) || NOTALIGNED(len)) { | |
1570 | printk (KERN_NOTICE "nand_write_ecc: Attempt to write not page aligned data\n"); | |
1571 | return -EINVAL; | |
1572 | } | |
1573 | ||
1574 | /* Grab the lock and see if the device is available */ | |
1575 | nand_get_device (this, mtd, FL_WRITING); | |
1576 | ||
1577 | /* Calculate chipnr */ | |
1578 | chipnr = (int)(to >> this->chip_shift); | |
1579 | /* Select the NAND device */ | |
1580 | this->select_chip(mtd, chipnr); | |
1581 | ||
1582 | /* Check, if it is write protected */ | |
1583 | if (nand_check_wp(mtd)) | |
1584 | goto out; | |
1585 | ||
1586 | /* if oobsel is NULL, use chip defaults */ | |
1587 | if (oobsel == NULL) | |
1588 | oobsel = &mtd->oobinfo; | |
1589 | ||
1590 | /* Autoplace of oob data ? Use the default placement scheme */ | |
1591 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) { | |
1592 | oobsel = this->autooob; | |
1593 | autoplace = 1; | |
1594 | } | |
1595 | ||
1596 | /* Setup variables and oob buffer */ | |
1597 | totalpages = len >> this->page_shift; | |
1598 | page = (int) (to >> this->page_shift); | |
1599 | /* Invalidate the page cache, if we write to the cached page */ | |
1600 | if (page <= this->pagebuf && this->pagebuf < (page + totalpages)) | |
1601 | this->pagebuf = -1; | |
1602 | ||
1603 | /* Set it relative to chip */ | |
1604 | page &= this->pagemask; | |
1605 | startpage = page; | |
1606 | /* Calc number of pages we can write in one go */ | |
1607 | numpages = min (ppblock - (startpage & (ppblock - 1)), totalpages); | |
1608 | oobbuf = nand_prepare_oobbuf (mtd, eccbuf, oobsel, autoplace, numpages); | |
1609 | bufstart = (u_char *)buf; | |
1610 | ||
1611 | /* Loop until all data is written */ | |
1612 | while (written < len) { | |
1613 | ||
1614 | this->data_poi = (u_char*) &buf[written]; | |
1615 | /* Write one page. If this is the last page to write | |
1616 | * or the last page in this block, then use the | |
1617 | * real pageprogram command, else select cached programming | |
1618 | * if supported by the chip. | |
1619 | */ | |
1620 | ret = nand_write_page (mtd, this, page, &oobbuf[oob], oobsel, (--numpages > 0)); | |
1621 | if (ret) { | |
1622 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: write_page failed %d\n", ret); | |
1623 | goto out; | |
1624 | } | |
1625 | /* Next oob page */ | |
1626 | oob += mtd->oobsize; | |
1627 | /* Update written bytes count */ | |
1628 | written += mtd->oobblock; | |
1629 | if (written == len) | |
1630 | goto cmp; | |
1631 | ||
1632 | /* Increment page address */ | |
1633 | page++; | |
1634 | ||
1635 | /* Have we hit a block boundary ? Then we have to verify and | |
1636 | * if verify is ok, we have to setup the oob buffer for | |
1637 | * the next pages. | |
1638 | */ | |
1639 | if (!(page & (ppblock - 1))){ | |
1640 | int ofs; | |
1641 | this->data_poi = bufstart; | |
1642 | ret = nand_verify_pages (mtd, this, startpage, | |
1643 | page - startpage, | |
1644 | oobbuf, oobsel, chipnr, (eccbuf != NULL)); | |
1645 | if (ret) { | |
1646 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: verify_pages failed %d\n", ret); | |
1647 | goto out; | |
1648 | } | |
1649 | *retlen = written; | |
1650 | ||
1651 | ofs = autoplace ? mtd->oobavail : mtd->oobsize; | |
1652 | if (eccbuf) | |
1653 | eccbuf += (page - startpage) * ofs; | |
1654 | totalpages -= page - startpage; | |
1655 | numpages = min (totalpages, ppblock); | |
1656 | page &= this->pagemask; | |
1657 | startpage = page; | |
1658 | oobbuf = nand_prepare_oobbuf (mtd, eccbuf, oobsel, | |
1659 | autoplace, numpages); | |
1660 | /* Check, if we cross a chip boundary */ | |
1661 | if (!page) { | |
1662 | chipnr++; | |
1663 | this->select_chip(mtd, -1); | |
1664 | this->select_chip(mtd, chipnr); | |
1665 | } | |
1666 | } | |
1667 | } | |
1668 | /* Verify the remaining pages */ | |
1669 | cmp: | |
1670 | this->data_poi = bufstart; | |
1671 | ret = nand_verify_pages (mtd, this, startpage, totalpages, | |
1672 | oobbuf, oobsel, chipnr, (eccbuf != NULL)); | |
1673 | if (!ret) | |
1674 | *retlen = written; | |
1675 | else | |
1676 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: verify_pages failed %d\n", ret); | |
1677 | ||
1678 | out: | |
1679 | /* Deselect and wake up anyone waiting on the device */ | |
1680 | nand_release_device(mtd); | |
1681 | ||
1682 | return ret; | |
1683 | } | |
1684 | ||
1685 | ||
1686 | /** | |
1687 | * nand_write_oob - [MTD Interface] NAND write out-of-band | |
1688 | * @mtd: MTD device structure | |
1689 | * @to: offset to write to | |
1690 | * @len: number of bytes to write | |
1691 | * @retlen: pointer to variable to store the number of written bytes | |
1692 | * @buf: the data to write | |
1693 | * | |
1694 | * NAND write out-of-band | |
1695 | */ | |
1696 | static int nand_write_oob (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char * buf) | |
1697 | { | |
1698 | int column, page, status, ret = -EIO, chipnr; | |
1699 | struct nand_chip *this = mtd->priv; | |
1700 | ||
1701 | DEBUG (MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len); | |
1702 | ||
1703 | /* Shift to get page */ | |
1704 | page = (int) (to >> this->page_shift); | |
1705 | chipnr = (int) (to >> this->chip_shift); | |
1706 | ||
1707 | /* Mask to get column */ | |
1708 | column = to & (mtd->oobsize - 1); | |
1709 | ||
1710 | /* Initialize return length value */ | |
1711 | *retlen = 0; | |
1712 | ||
1713 | /* Do not allow write past end of page */ | |
1714 | if ((column + len) > mtd->oobsize) { | |
1715 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_oob: Attempt to write past end of page\n"); | |
1716 | return -EINVAL; | |
1717 | } | |
1718 | ||
1719 | /* Grab the lock and see if the device is available */ | |
1720 | nand_get_device (this, mtd, FL_WRITING); | |
1721 | ||
1722 | /* Select the NAND device */ | |
1723 | this->select_chip(mtd, chipnr); | |
1724 | ||
1725 | /* Reset the chip. Some chips (like the Toshiba TC5832DC found | |
1726 | in one of my DiskOnChip 2000 test units) will clear the whole | |
1727 | data page too if we don't do this. I have no clue why, but | |
1728 | I seem to have 'fixed' it in the doc2000 driver in | |
1729 | August 1999. dwmw2. */ | |
1730 | this->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); | |
1731 | ||
1732 | /* Check, if it is write protected */ | |
1733 | if (nand_check_wp(mtd)) | |
1734 | goto out; | |
1735 | ||
1736 | /* Invalidate the page cache, if we write to the cached page */ | |
1737 | if (page == this->pagebuf) | |
1738 | this->pagebuf = -1; | |
1739 | ||
1740 | if (NAND_MUST_PAD(this)) { | |
1741 | /* Write out desired data */ | |
1742 | this->cmdfunc (mtd, NAND_CMD_SEQIN, mtd->oobblock, page & this->pagemask); | |
1743 | /* prepad 0xff for partial programming */ | |
1744 | this->write_buf(mtd, ffchars, column); | |
1745 | /* write data */ | |
1746 | this->write_buf(mtd, buf, len); | |
1747 | /* postpad 0xff for partial programming */ | |
1748 | this->write_buf(mtd, ffchars, mtd->oobsize - (len+column)); | |
1749 | } else { | |
1750 | /* Write out desired data */ | |
1751 | this->cmdfunc (mtd, NAND_CMD_SEQIN, mtd->oobblock + column, page & this->pagemask); | |
1752 | /* write data */ | |
1753 | this->write_buf(mtd, buf, len); | |
1754 | } | |
1755 | /* Send command to program the OOB data */ | |
1756 | this->cmdfunc (mtd, NAND_CMD_PAGEPROG, -1, -1); | |
1757 | ||
1758 | status = this->waitfunc (mtd, this, FL_WRITING); | |
1759 | ||
1760 | /* See if device thinks it succeeded */ | |
a4ab4c5d | 1761 | if (status & NAND_STATUS_FAIL) { |
1da177e4 LT |
1762 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write, page 0x%08x\n", page); |
1763 | ret = -EIO; | |
1764 | goto out; | |
1765 | } | |
1766 | /* Return happy */ | |
1767 | *retlen = len; | |
1768 | ||
1769 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE | |
1770 | /* Send command to read back the data */ | |
1771 | this->cmdfunc (mtd, NAND_CMD_READOOB, column, page & this->pagemask); | |
1772 | ||
1773 | if (this->verify_buf(mtd, buf, len)) { | |
1774 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write verify, page 0x%08x\n", page); | |
1775 | ret = -EIO; | |
1776 | goto out; | |
1777 | } | |
1778 | #endif | |
1779 | ret = 0; | |
1780 | out: | |
1781 | /* Deselect and wake up anyone waiting on the device */ | |
1782 | nand_release_device(mtd); | |
1783 | ||
1784 | return ret; | |
1785 | } | |
1786 | ||
1787 | ||
1788 | /** | |
1789 | * nand_writev - [MTD Interface] compabilty function for nand_writev_ecc | |
1790 | * @mtd: MTD device structure | |
1791 | * @vecs: the iovectors to write | |
1792 | * @count: number of vectors | |
1793 | * @to: offset to write to | |
1794 | * @retlen: pointer to variable to store the number of written bytes | |
1795 | * | |
1796 | * NAND write with kvec. This just calls the ecc function | |
1797 | */ | |
1798 | static int nand_writev (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, | |
1799 | loff_t to, size_t * retlen) | |
1800 | { | |
1801 | return (nand_writev_ecc (mtd, vecs, count, to, retlen, NULL, NULL)); | |
1802 | } | |
1803 | ||
1804 | /** | |
1805 | * nand_writev_ecc - [MTD Interface] write with iovec with ecc | |
1806 | * @mtd: MTD device structure | |
1807 | * @vecs: the iovectors to write | |
1808 | * @count: number of vectors | |
1809 | * @to: offset to write to | |
1810 | * @retlen: pointer to variable to store the number of written bytes | |
1811 | * @eccbuf: filesystem supplied oob data buffer | |
1812 | * @oobsel: oob selection structure | |
1813 | * | |
1814 | * NAND write with iovec with ecc | |
1815 | */ | |
1816 | static int nand_writev_ecc (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, | |
1817 | loff_t to, size_t * retlen, u_char *eccbuf, struct nand_oobinfo *oobsel) | |
1818 | { | |
1819 | int i, page, len, total_len, ret = -EIO, written = 0, chipnr; | |
1820 | int oob, numpages, autoplace = 0, startpage; | |
1821 | struct nand_chip *this = mtd->priv; | |
1822 | int ppblock = (1 << (this->phys_erase_shift - this->page_shift)); | |
1823 | u_char *oobbuf, *bufstart; | |
1824 | ||
1825 | /* Preset written len for early exit */ | |
1826 | *retlen = 0; | |
1827 | ||
1828 | /* Calculate total length of data */ | |
1829 | total_len = 0; | |
1830 | for (i = 0; i < count; i++) | |
1831 | total_len += (int) vecs[i].iov_len; | |
1832 | ||
1833 | DEBUG (MTD_DEBUG_LEVEL3, | |
1834 | "nand_writev: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len, count); | |
1835 | ||
1836 | /* Do not allow write past end of page */ | |
1837 | if ((to + total_len) > mtd->size) { | |
1838 | DEBUG (MTD_DEBUG_LEVEL0, "nand_writev: Attempted write past end of device\n"); | |
1839 | return -EINVAL; | |
1840 | } | |
1841 | ||
1842 | /* reject writes, which are not page aligned */ | |
1843 | if (NOTALIGNED (to) || NOTALIGNED(total_len)) { | |
1844 | printk (KERN_NOTICE "nand_write_ecc: Attempt to write not page aligned data\n"); | |
1845 | return -EINVAL; | |
1846 | } | |
1847 | ||
1848 | /* Grab the lock and see if the device is available */ | |
1849 | nand_get_device (this, mtd, FL_WRITING); | |
1850 | ||
1851 | /* Get the current chip-nr */ | |
1852 | chipnr = (int) (to >> this->chip_shift); | |
1853 | /* Select the NAND device */ | |
1854 | this->select_chip(mtd, chipnr); | |
1855 | ||
1856 | /* Check, if it is write protected */ | |
1857 | if (nand_check_wp(mtd)) | |
1858 | goto out; | |
1859 | ||
1860 | /* if oobsel is NULL, use chip defaults */ | |
1861 | if (oobsel == NULL) | |
1862 | oobsel = &mtd->oobinfo; | |
1863 | ||
1864 | /* Autoplace of oob data ? Use the default placement scheme */ | |
1865 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) { | |
1866 | oobsel = this->autooob; | |
1867 | autoplace = 1; | |
1868 | } | |
1869 | ||
1870 | /* Setup start page */ | |
1871 | page = (int) (to >> this->page_shift); | |
1872 | /* Invalidate the page cache, if we write to the cached page */ | |
1873 | if (page <= this->pagebuf && this->pagebuf < ((to + total_len) >> this->page_shift)) | |
1874 | this->pagebuf = -1; | |
1875 | ||
1876 | startpage = page & this->pagemask; | |
1877 | ||
1878 | /* Loop until all kvec' data has been written */ | |
1879 | len = 0; | |
1880 | while (count) { | |
1881 | /* If the given tuple is >= pagesize then | |
1882 | * write it out from the iov | |
1883 | */ | |
1884 | if ((vecs->iov_len - len) >= mtd->oobblock) { | |
1885 | /* Calc number of pages we can write | |
1886 | * out of this iov in one go */ | |
1887 | numpages = (vecs->iov_len - len) >> this->page_shift; | |
1888 | /* Do not cross block boundaries */ | |
1889 | numpages = min (ppblock - (startpage & (ppblock - 1)), numpages); | |
1890 | oobbuf = nand_prepare_oobbuf (mtd, NULL, oobsel, autoplace, numpages); | |
1891 | bufstart = (u_char *)vecs->iov_base; | |
1892 | bufstart += len; | |
1893 | this->data_poi = bufstart; | |
1894 | oob = 0; | |
1895 | for (i = 1; i <= numpages; i++) { | |
1896 | /* Write one page. If this is the last page to write | |
1897 | * then use the real pageprogram command, else select | |
1898 | * cached programming if supported by the chip. | |
1899 | */ | |
1900 | ret = nand_write_page (mtd, this, page & this->pagemask, | |
1901 | &oobbuf[oob], oobsel, i != numpages); | |
1902 | if (ret) | |
1903 | goto out; | |
1904 | this->data_poi += mtd->oobblock; | |
1905 | len += mtd->oobblock; | |
1906 | oob += mtd->oobsize; | |
1907 | page++; | |
1908 | } | |
1909 | /* Check, if we have to switch to the next tuple */ | |
1910 | if (len >= (int) vecs->iov_len) { | |
1911 | vecs++; | |
1912 | len = 0; | |
1913 | count--; | |
1914 | } | |
1915 | } else { | |
1916 | /* We must use the internal buffer, read data out of each | |
1917 | * tuple until we have a full page to write | |
1918 | */ | |
1919 | int cnt = 0; | |
1920 | while (cnt < mtd->oobblock) { | |
1921 | if (vecs->iov_base != NULL && vecs->iov_len) | |
1922 | this->data_buf[cnt++] = ((u_char *) vecs->iov_base)[len++]; | |
1923 | /* Check, if we have to switch to the next tuple */ | |
1924 | if (len >= (int) vecs->iov_len) { | |
1925 | vecs++; | |
1926 | len = 0; | |
1927 | count--; | |
1928 | } | |
1929 | } | |
1930 | this->pagebuf = page; | |
1931 | this->data_poi = this->data_buf; | |
1932 | bufstart = this->data_poi; | |
1933 | numpages = 1; | |
1934 | oobbuf = nand_prepare_oobbuf (mtd, NULL, oobsel, autoplace, numpages); | |
1935 | ret = nand_write_page (mtd, this, page & this->pagemask, | |
1936 | oobbuf, oobsel, 0); | |
1937 | if (ret) | |
1938 | goto out; | |
1939 | page++; | |
1940 | } | |
1941 | ||
1942 | this->data_poi = bufstart; | |
1943 | ret = nand_verify_pages (mtd, this, startpage, numpages, oobbuf, oobsel, chipnr, 0); | |
1944 | if (ret) | |
1945 | goto out; | |
1946 | ||
1947 | written += mtd->oobblock * numpages; | |
1948 | /* All done ? */ | |
1949 | if (!count) | |
1950 | break; | |
1951 | ||
1952 | startpage = page & this->pagemask; | |
1953 | /* Check, if we cross a chip boundary */ | |
1954 | if (!startpage) { | |
1955 | chipnr++; | |
1956 | this->select_chip(mtd, -1); | |
1957 | this->select_chip(mtd, chipnr); | |
1958 | } | |
1959 | } | |
1960 | ret = 0; | |
1961 | out: | |
1962 | /* Deselect and wake up anyone waiting on the device */ | |
1963 | nand_release_device(mtd); | |
1964 | ||
1965 | *retlen = written; | |
1966 | return ret; | |
1967 | } | |
1968 | ||
1969 | /** | |
1970 | * single_erease_cmd - [GENERIC] NAND standard block erase command function | |
1971 | * @mtd: MTD device structure | |
1972 | * @page: the page address of the block which will be erased | |
1973 | * | |
1974 | * Standard erase command for NAND chips | |
1975 | */ | |
1976 | static void single_erase_cmd (struct mtd_info *mtd, int page) | |
1977 | { | |
1978 | struct nand_chip *this = mtd->priv; | |
1979 | /* Send commands to erase a block */ | |
1980 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page); | |
1981 | this->cmdfunc (mtd, NAND_CMD_ERASE2, -1, -1); | |
1982 | } | |
1983 | ||
1984 | /** | |
1985 | * multi_erease_cmd - [GENERIC] AND specific block erase command function | |
1986 | * @mtd: MTD device structure | |
1987 | * @page: the page address of the block which will be erased | |
1988 | * | |
1989 | * AND multi block erase command function | |
1990 | * Erase 4 consecutive blocks | |
1991 | */ | |
1992 | static void multi_erase_cmd (struct mtd_info *mtd, int page) | |
1993 | { | |
1994 | struct nand_chip *this = mtd->priv; | |
1995 | /* Send commands to erase a block */ | |
1996 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page++); | |
1997 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page++); | |
1998 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page++); | |
1999 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page); | |
2000 | this->cmdfunc (mtd, NAND_CMD_ERASE2, -1, -1); | |
2001 | } | |
2002 | ||
2003 | /** | |
2004 | * nand_erase - [MTD Interface] erase block(s) | |
2005 | * @mtd: MTD device structure | |
2006 | * @instr: erase instruction | |
2007 | * | |
2008 | * Erase one ore more blocks | |
2009 | */ | |
2010 | static int nand_erase (struct mtd_info *mtd, struct erase_info *instr) | |
2011 | { | |
2012 | return nand_erase_nand (mtd, instr, 0); | |
2013 | } | |
2014 | ||
30f464b7 | 2015 | #define BBT_PAGE_MASK 0xffffff3f |
1da177e4 LT |
2016 | /** |
2017 | * nand_erase_intern - [NAND Interface] erase block(s) | |
2018 | * @mtd: MTD device structure | |
2019 | * @instr: erase instruction | |
2020 | * @allowbbt: allow erasing the bbt area | |
2021 | * | |
2022 | * Erase one ore more blocks | |
2023 | */ | |
2024 | int nand_erase_nand (struct mtd_info *mtd, struct erase_info *instr, int allowbbt) | |
2025 | { | |
2026 | int page, len, status, pages_per_block, ret, chipnr; | |
2027 | struct nand_chip *this = mtd->priv; | |
30f464b7 DM |
2028 | int rewrite_bbt[NAND_MAX_CHIPS]={0}; /* flags to indicate the page, if bbt needs to be rewritten. */ |
2029 | unsigned int bbt_masked_page; /* bbt mask to compare to page being erased. */ | |
2030 | /* It is used to see if the current page is in the same */ | |
2031 | /* 256 block group and the same bank as the bbt. */ | |
1da177e4 LT |
2032 | |
2033 | DEBUG (MTD_DEBUG_LEVEL3, | |
2034 | "nand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len); | |
2035 | ||
2036 | /* Start address must align on block boundary */ | |
2037 | if (instr->addr & ((1 << this->phys_erase_shift) - 1)) { | |
2038 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: Unaligned address\n"); | |
2039 | return -EINVAL; | |
2040 | } | |
2041 | ||
2042 | /* Length must align on block boundary */ | |
2043 | if (instr->len & ((1 << this->phys_erase_shift) - 1)) { | |
2044 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: Length not block aligned\n"); | |
2045 | return -EINVAL; | |
2046 | } | |
2047 | ||
2048 | /* Do not allow erase past end of device */ | |
2049 | if ((instr->len + instr->addr) > mtd->size) { | |
2050 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: Erase past end of device\n"); | |
2051 | return -EINVAL; | |
2052 | } | |
2053 | ||
2054 | instr->fail_addr = 0xffffffff; | |
2055 | ||
2056 | /* Grab the lock and see if the device is available */ | |
2057 | nand_get_device (this, mtd, FL_ERASING); | |
2058 | ||
2059 | /* Shift to get first page */ | |
2060 | page = (int) (instr->addr >> this->page_shift); | |
2061 | chipnr = (int) (instr->addr >> this->chip_shift); | |
2062 | ||
2063 | /* Calculate pages in each block */ | |
2064 | pages_per_block = 1 << (this->phys_erase_shift - this->page_shift); | |
2065 | ||
2066 | /* Select the NAND device */ | |
2067 | this->select_chip(mtd, chipnr); | |
2068 | ||
2069 | /* Check the WP bit */ | |
2070 | /* Check, if it is write protected */ | |
2071 | if (nand_check_wp(mtd)) { | |
2072 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: Device is write protected!!!\n"); | |
2073 | instr->state = MTD_ERASE_FAILED; | |
2074 | goto erase_exit; | |
2075 | } | |
2076 | ||
30f464b7 DM |
2077 | /* if BBT requires refresh, set the BBT page mask to see if the BBT should be rewritten */ |
2078 | if (this->options & BBT_AUTO_REFRESH) { | |
2079 | bbt_masked_page = this->bbt_td->pages[chipnr] & BBT_PAGE_MASK; | |
2080 | } else { | |
2081 | bbt_masked_page = 0xffffffff; /* should not match anything */ | |
2082 | } | |
2083 | ||
1da177e4 LT |
2084 | /* Loop through the pages */ |
2085 | len = instr->len; | |
2086 | ||
2087 | instr->state = MTD_ERASING; | |
2088 | ||
2089 | while (len) { | |
2090 | /* Check if we have a bad block, we do not erase bad blocks ! */ | |
2091 | if (nand_block_checkbad(mtd, ((loff_t) page) << this->page_shift, 0, allowbbt)) { | |
2092 | printk (KERN_WARNING "nand_erase: attempt to erase a bad block at page 0x%08x\n", page); | |
2093 | instr->state = MTD_ERASE_FAILED; | |
2094 | goto erase_exit; | |
2095 | } | |
2096 | ||
2097 | /* Invalidate the page cache, if we erase the block which contains | |
2098 | the current cached page */ | |
2099 | if (page <= this->pagebuf && this->pagebuf < (page + pages_per_block)) | |
2100 | this->pagebuf = -1; | |
2101 | ||
2102 | this->erase_cmd (mtd, page & this->pagemask); | |
2103 | ||
2104 | status = this->waitfunc (mtd, this, FL_ERASING); | |
2105 | ||
2106 | /* See if block erase succeeded */ | |
a4ab4c5d | 2107 | if (status & NAND_STATUS_FAIL) { |
1da177e4 LT |
2108 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: " "Failed erase, page 0x%08x\n", page); |
2109 | instr->state = MTD_ERASE_FAILED; | |
2110 | instr->fail_addr = (page << this->page_shift); | |
2111 | goto erase_exit; | |
2112 | } | |
30f464b7 DM |
2113 | |
2114 | /* if BBT requires refresh, set the BBT rewrite flag to the page being erased */ | |
2115 | if (this->options & BBT_AUTO_REFRESH) { | |
2116 | if (((page & BBT_PAGE_MASK) == bbt_masked_page) && | |
2117 | (page != this->bbt_td->pages[chipnr])) { | |
2118 | rewrite_bbt[chipnr] = (page << this->page_shift); | |
2119 | } | |
2120 | } | |
1da177e4 LT |
2121 | |
2122 | /* Increment page address and decrement length */ | |
2123 | len -= (1 << this->phys_erase_shift); | |
2124 | page += pages_per_block; | |
2125 | ||
2126 | /* Check, if we cross a chip boundary */ | |
2127 | if (len && !(page & this->pagemask)) { | |
2128 | chipnr++; | |
2129 | this->select_chip(mtd, -1); | |
2130 | this->select_chip(mtd, chipnr); | |
30f464b7 DM |
2131 | |
2132 | /* if BBT requires refresh and BBT-PERCHIP, | |
2133 | * set the BBT page mask to see if this BBT should be rewritten */ | |
2134 | if ((this->options & BBT_AUTO_REFRESH) && (this->bbt_td->options & NAND_BBT_PERCHIP)) { | |
2135 | bbt_masked_page = this->bbt_td->pages[chipnr] & BBT_PAGE_MASK; | |
2136 | } | |
2137 | ||
1da177e4 LT |
2138 | } |
2139 | } | |
2140 | instr->state = MTD_ERASE_DONE; | |
2141 | ||
2142 | erase_exit: | |
2143 | ||
2144 | ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO; | |
2145 | /* Do call back function */ | |
2146 | if (!ret) | |
2147 | mtd_erase_callback(instr); | |
2148 | ||
2149 | /* Deselect and wake up anyone waiting on the device */ | |
2150 | nand_release_device(mtd); | |
2151 | ||
30f464b7 DM |
2152 | /* if BBT requires refresh and erase was successful, rewrite any selected bad block tables */ |
2153 | if ((this->options & BBT_AUTO_REFRESH) && (!ret)) { | |
2154 | for (chipnr = 0; chipnr < this->numchips; chipnr++) { | |
2155 | if (rewrite_bbt[chipnr]) { | |
2156 | /* update the BBT for chip */ | |
2157 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase_nand: nand_update_bbt (%d:0x%0x 0x%0x)\n", | |
2158 | chipnr, rewrite_bbt[chipnr], this->bbt_td->pages[chipnr]); | |
2159 | nand_update_bbt (mtd, rewrite_bbt[chipnr]); | |
2160 | } | |
2161 | } | |
2162 | } | |
2163 | ||
1da177e4 LT |
2164 | /* Return more or less happy */ |
2165 | return ret; | |
2166 | } | |
2167 | ||
2168 | /** | |
2169 | * nand_sync - [MTD Interface] sync | |
2170 | * @mtd: MTD device structure | |
2171 | * | |
2172 | * Sync is actually a wait for chip ready function | |
2173 | */ | |
2174 | static void nand_sync (struct mtd_info *mtd) | |
2175 | { | |
2176 | struct nand_chip *this = mtd->priv; | |
2177 | ||
2178 | DEBUG (MTD_DEBUG_LEVEL3, "nand_sync: called\n"); | |
2179 | ||
2180 | /* Grab the lock and see if the device is available */ | |
2181 | nand_get_device (this, mtd, FL_SYNCING); | |
2182 | /* Release it and go back */ | |
2183 | nand_release_device (mtd); | |
2184 | } | |
2185 | ||
2186 | ||
2187 | /** | |
2188 | * nand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad | |
2189 | * @mtd: MTD device structure | |
2190 | * @ofs: offset relative to mtd start | |
2191 | */ | |
2192 | static int nand_block_isbad (struct mtd_info *mtd, loff_t ofs) | |
2193 | { | |
2194 | /* Check for invalid offset */ | |
2195 | if (ofs > mtd->size) | |
2196 | return -EINVAL; | |
2197 | ||
2198 | return nand_block_checkbad (mtd, ofs, 1, 0); | |
2199 | } | |
2200 | ||
2201 | /** | |
2202 | * nand_block_markbad - [MTD Interface] Mark the block at the given offset as bad | |
2203 | * @mtd: MTD device structure | |
2204 | * @ofs: offset relative to mtd start | |
2205 | */ | |
2206 | static int nand_block_markbad (struct mtd_info *mtd, loff_t ofs) | |
2207 | { | |
2208 | struct nand_chip *this = mtd->priv; | |
2209 | int ret; | |
2210 | ||
2211 | if ((ret = nand_block_isbad(mtd, ofs))) { | |
2212 | /* If it was bad already, return success and do nothing. */ | |
2213 | if (ret > 0) | |
2214 | return 0; | |
2215 | return ret; | |
2216 | } | |
2217 | ||
2218 | return this->block_markbad(mtd, ofs); | |
2219 | } | |
2220 | ||
2221 | /** | |
2222 | * nand_scan - [NAND Interface] Scan for the NAND device | |
2223 | * @mtd: MTD device structure | |
2224 | * @maxchips: Number of chips to scan for | |
2225 | * | |
2226 | * This fills out all the not initialized function pointers | |
2227 | * with the defaults. | |
2228 | * The flash ID is read and the mtd/chip structures are | |
2229 | * filled with the appropriate values. Buffers are allocated if | |
2230 | * they are not provided by the board driver | |
2231 | * | |
2232 | */ | |
2233 | int nand_scan (struct mtd_info *mtd, int maxchips) | |
2234 | { | |
2235 | int i, j, nand_maf_id, nand_dev_id, busw; | |
2236 | struct nand_chip *this = mtd->priv; | |
2237 | ||
2238 | /* Get buswidth to select the correct functions*/ | |
2239 | busw = this->options & NAND_BUSWIDTH_16; | |
2240 | ||
2241 | /* check for proper chip_delay setup, set 20us if not */ | |
2242 | if (!this->chip_delay) | |
2243 | this->chip_delay = 20; | |
2244 | ||
2245 | /* check, if a user supplied command function given */ | |
2246 | if (this->cmdfunc == NULL) | |
2247 | this->cmdfunc = nand_command; | |
2248 | ||
2249 | /* check, if a user supplied wait function given */ | |
2250 | if (this->waitfunc == NULL) | |
2251 | this->waitfunc = nand_wait; | |
2252 | ||
2253 | if (!this->select_chip) | |
2254 | this->select_chip = nand_select_chip; | |
2255 | if (!this->write_byte) | |
2256 | this->write_byte = busw ? nand_write_byte16 : nand_write_byte; | |
2257 | if (!this->read_byte) | |
2258 | this->read_byte = busw ? nand_read_byte16 : nand_read_byte; | |
2259 | if (!this->write_word) | |
2260 | this->write_word = nand_write_word; | |
2261 | if (!this->read_word) | |
2262 | this->read_word = nand_read_word; | |
2263 | if (!this->block_bad) | |
2264 | this->block_bad = nand_block_bad; | |
2265 | if (!this->block_markbad) | |
2266 | this->block_markbad = nand_default_block_markbad; | |
2267 | if (!this->write_buf) | |
2268 | this->write_buf = busw ? nand_write_buf16 : nand_write_buf; | |
2269 | if (!this->read_buf) | |
2270 | this->read_buf = busw ? nand_read_buf16 : nand_read_buf; | |
2271 | if (!this->verify_buf) | |
2272 | this->verify_buf = busw ? nand_verify_buf16 : nand_verify_buf; | |
2273 | if (!this->scan_bbt) | |
2274 | this->scan_bbt = nand_default_bbt; | |
2275 | ||
2276 | /* Select the device */ | |
2277 | this->select_chip(mtd, 0); | |
2278 | ||
2279 | /* Send the command for reading device ID */ | |
2280 | this->cmdfunc (mtd, NAND_CMD_READID, 0x00, -1); | |
2281 | ||
2282 | /* Read manufacturer and device IDs */ | |
2283 | nand_maf_id = this->read_byte(mtd); | |
2284 | nand_dev_id = this->read_byte(mtd); | |
2285 | ||
2286 | /* Print and store flash device information */ | |
2287 | for (i = 0; nand_flash_ids[i].name != NULL; i++) { | |
2288 | ||
2289 | if (nand_dev_id != nand_flash_ids[i].id) | |
2290 | continue; | |
2291 | ||
2292 | if (!mtd->name) mtd->name = nand_flash_ids[i].name; | |
2293 | this->chipsize = nand_flash_ids[i].chipsize << 20; | |
2294 | ||
2295 | /* New devices have all the information in additional id bytes */ | |
2296 | if (!nand_flash_ids[i].pagesize) { | |
2297 | int extid; | |
2298 | /* The 3rd id byte contains non relevant data ATM */ | |
2299 | extid = this->read_byte(mtd); | |
2300 | /* The 4th id byte is the important one */ | |
2301 | extid = this->read_byte(mtd); | |
2302 | /* Calc pagesize */ | |
2303 | mtd->oobblock = 1024 << (extid & 0x3); | |
2304 | extid >>= 2; | |
2305 | /* Calc oobsize */ | |
2306 | mtd->oobsize = (8 << (extid & 0x03)) * (mtd->oobblock / 512); | |
2307 | extid >>= 2; | |
2308 | /* Calc blocksize. Blocksize is multiples of 64KiB */ | |
2309 | mtd->erasesize = (64 * 1024) << (extid & 0x03); | |
2310 | extid >>= 2; | |
2311 | /* Get buswidth information */ | |
2312 | busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0; | |
2313 | ||
2314 | } else { | |
2315 | /* Old devices have this data hardcoded in the | |
2316 | * device id table */ | |
2317 | mtd->erasesize = nand_flash_ids[i].erasesize; | |
2318 | mtd->oobblock = nand_flash_ids[i].pagesize; | |
2319 | mtd->oobsize = mtd->oobblock / 32; | |
2320 | busw = nand_flash_ids[i].options & NAND_BUSWIDTH_16; | |
2321 | } | |
2322 | ||
2323 | /* Check, if buswidth is correct. Hardware drivers should set | |
2324 | * this correct ! */ | |
2325 | if (busw != (this->options & NAND_BUSWIDTH_16)) { | |
2326 | printk (KERN_INFO "NAND device: Manufacturer ID:" | |
2327 | " 0x%02x, Chip ID: 0x%02x (%s %s)\n", nand_maf_id, nand_dev_id, | |
2328 | nand_manuf_ids[i].name , mtd->name); | |
2329 | printk (KERN_WARNING | |
2330 | "NAND bus width %d instead %d bit\n", | |
2331 | (this->options & NAND_BUSWIDTH_16) ? 16 : 8, | |
2332 | busw ? 16 : 8); | |
2333 | this->select_chip(mtd, -1); | |
2334 | return 1; | |
2335 | } | |
2336 | ||
2337 | /* Calculate the address shift from the page size */ | |
2338 | this->page_shift = ffs(mtd->oobblock) - 1; | |
2339 | this->bbt_erase_shift = this->phys_erase_shift = ffs(mtd->erasesize) - 1; | |
2340 | this->chip_shift = ffs(this->chipsize) - 1; | |
2341 | ||
2342 | /* Set the bad block position */ | |
2343 | this->badblockpos = mtd->oobblock > 512 ? | |
2344 | NAND_LARGE_BADBLOCK_POS : NAND_SMALL_BADBLOCK_POS; | |
2345 | ||
2346 | /* Get chip options, preserve non chip based options */ | |
2347 | this->options &= ~NAND_CHIPOPTIONS_MSK; | |
2348 | this->options |= nand_flash_ids[i].options & NAND_CHIPOPTIONS_MSK; | |
2349 | /* Set this as a default. Board drivers can override it, if neccecary */ | |
2350 | this->options |= NAND_NO_AUTOINCR; | |
2351 | /* Check if this is a not a samsung device. Do not clear the options | |
2352 | * for chips which are not having an extended id. | |
2353 | */ | |
2354 | if (nand_maf_id != NAND_MFR_SAMSUNG && !nand_flash_ids[i].pagesize) | |
2355 | this->options &= ~NAND_SAMSUNG_LP_OPTIONS; | |
2356 | ||
2357 | /* Check for AND chips with 4 page planes */ | |
2358 | if (this->options & NAND_4PAGE_ARRAY) | |
2359 | this->erase_cmd = multi_erase_cmd; | |
2360 | else | |
2361 | this->erase_cmd = single_erase_cmd; | |
2362 | ||
2363 | /* Do not replace user supplied command function ! */ | |
2364 | if (mtd->oobblock > 512 && this->cmdfunc == nand_command) | |
2365 | this->cmdfunc = nand_command_lp; | |
2366 | ||
2367 | /* Try to identify manufacturer */ | |
2368 | for (j = 0; nand_manuf_ids[j].id != 0x0; j++) { | |
2369 | if (nand_manuf_ids[j].id == nand_maf_id) | |
2370 | break; | |
2371 | } | |
2372 | printk (KERN_INFO "NAND device: Manufacturer ID:" | |
2373 | " 0x%02x, Chip ID: 0x%02x (%s %s)\n", nand_maf_id, nand_dev_id, | |
2374 | nand_manuf_ids[j].name , nand_flash_ids[i].name); | |
2375 | break; | |
2376 | } | |
2377 | ||
2378 | if (!nand_flash_ids[i].name) { | |
2379 | printk (KERN_WARNING "No NAND device found!!!\n"); | |
2380 | this->select_chip(mtd, -1); | |
2381 | return 1; | |
2382 | } | |
2383 | ||
2384 | for (i=1; i < maxchips; i++) { | |
2385 | this->select_chip(mtd, i); | |
2386 | ||
2387 | /* Send the command for reading device ID */ | |
2388 | this->cmdfunc (mtd, NAND_CMD_READID, 0x00, -1); | |
2389 | ||
2390 | /* Read manufacturer and device IDs */ | |
2391 | if (nand_maf_id != this->read_byte(mtd) || | |
2392 | nand_dev_id != this->read_byte(mtd)) | |
2393 | break; | |
2394 | } | |
2395 | if (i > 1) | |
2396 | printk(KERN_INFO "%d NAND chips detected\n", i); | |
2397 | ||
2398 | /* Allocate buffers, if neccecary */ | |
2399 | if (!this->oob_buf) { | |
2400 | size_t len; | |
2401 | len = mtd->oobsize << (this->phys_erase_shift - this->page_shift); | |
2402 | this->oob_buf = kmalloc (len, GFP_KERNEL); | |
2403 | if (!this->oob_buf) { | |
2404 | printk (KERN_ERR "nand_scan(): Cannot allocate oob_buf\n"); | |
2405 | return -ENOMEM; | |
2406 | } | |
2407 | this->options |= NAND_OOBBUF_ALLOC; | |
2408 | } | |
2409 | ||
2410 | if (!this->data_buf) { | |
2411 | size_t len; | |
2412 | len = mtd->oobblock + mtd->oobsize; | |
2413 | this->data_buf = kmalloc (len, GFP_KERNEL); | |
2414 | if (!this->data_buf) { | |
2415 | if (this->options & NAND_OOBBUF_ALLOC) | |
2416 | kfree (this->oob_buf); | |
2417 | printk (KERN_ERR "nand_scan(): Cannot allocate data_buf\n"); | |
2418 | return -ENOMEM; | |
2419 | } | |
2420 | this->options |= NAND_DATABUF_ALLOC; | |
2421 | } | |
2422 | ||
2423 | /* Store the number of chips and calc total size for mtd */ | |
2424 | this->numchips = i; | |
2425 | mtd->size = i * this->chipsize; | |
2426 | /* Convert chipsize to number of pages per chip -1. */ | |
2427 | this->pagemask = (this->chipsize >> this->page_shift) - 1; | |
2428 | /* Preset the internal oob buffer */ | |
2429 | memset(this->oob_buf, 0xff, mtd->oobsize << (this->phys_erase_shift - this->page_shift)); | |
2430 | ||
2431 | /* If no default placement scheme is given, select an | |
2432 | * appropriate one */ | |
2433 | if (!this->autooob) { | |
2434 | /* Select the appropriate default oob placement scheme for | |
2435 | * placement agnostic filesystems */ | |
2436 | switch (mtd->oobsize) { | |
2437 | case 8: | |
2438 | this->autooob = &nand_oob_8; | |
2439 | break; | |
2440 | case 16: | |
2441 | this->autooob = &nand_oob_16; | |
2442 | break; | |
2443 | case 64: | |
2444 | this->autooob = &nand_oob_64; | |
2445 | break; | |
2446 | default: | |
2447 | printk (KERN_WARNING "No oob scheme defined for oobsize %d\n", | |
2448 | mtd->oobsize); | |
2449 | BUG(); | |
2450 | } | |
2451 | } | |
2452 | ||
2453 | /* The number of bytes available for the filesystem to place fs dependend | |
2454 | * oob data */ | |
2455 | if (this->options & NAND_BUSWIDTH_16) { | |
2456 | mtd->oobavail = mtd->oobsize - (this->autooob->eccbytes + 2); | |
2457 | if (this->autooob->eccbytes & 0x01) | |
2458 | mtd->oobavail--; | |
2459 | } else | |
2460 | mtd->oobavail = mtd->oobsize - (this->autooob->eccbytes + 1); | |
2461 | ||
2462 | /* | |
2463 | * check ECC mode, default to software | |
2464 | * if 3byte/512byte hardware ECC is selected and we have 256 byte pagesize | |
2465 | * fallback to software ECC | |
2466 | */ | |
2467 | this->eccsize = 256; /* set default eccsize */ | |
2468 | this->eccbytes = 3; | |
2469 | ||
2470 | switch (this->eccmode) { | |
2471 | case NAND_ECC_HW12_2048: | |
2472 | if (mtd->oobblock < 2048) { | |
2473 | printk(KERN_WARNING "2048 byte HW ECC not possible on %d byte page size, fallback to SW ECC\n", | |
2474 | mtd->oobblock); | |
2475 | this->eccmode = NAND_ECC_SOFT; | |
2476 | this->calculate_ecc = nand_calculate_ecc; | |
2477 | this->correct_data = nand_correct_data; | |
2478 | } else | |
2479 | this->eccsize = 2048; | |
2480 | break; | |
2481 | ||
2482 | case NAND_ECC_HW3_512: | |
2483 | case NAND_ECC_HW6_512: | |
2484 | case NAND_ECC_HW8_512: | |
2485 | if (mtd->oobblock == 256) { | |
2486 | printk (KERN_WARNING "512 byte HW ECC not possible on 256 Byte pagesize, fallback to SW ECC \n"); | |
2487 | this->eccmode = NAND_ECC_SOFT; | |
2488 | this->calculate_ecc = nand_calculate_ecc; | |
2489 | this->correct_data = nand_correct_data; | |
2490 | } else | |
2491 | this->eccsize = 512; /* set eccsize to 512 */ | |
2492 | break; | |
2493 | ||
2494 | case NAND_ECC_HW3_256: | |
2495 | break; | |
2496 | ||
2497 | case NAND_ECC_NONE: | |
2498 | printk (KERN_WARNING "NAND_ECC_NONE selected by board driver. This is not recommended !!\n"); | |
2499 | this->eccmode = NAND_ECC_NONE; | |
2500 | break; | |
2501 | ||
2502 | case NAND_ECC_SOFT: | |
2503 | this->calculate_ecc = nand_calculate_ecc; | |
2504 | this->correct_data = nand_correct_data; | |
2505 | break; | |
2506 | ||
2507 | default: | |
2508 | printk (KERN_WARNING "Invalid NAND_ECC_MODE %d\n", this->eccmode); | |
2509 | BUG(); | |
2510 | } | |
2511 | ||
2512 | /* Check hardware ecc function availability and adjust number of ecc bytes per | |
2513 | * calculation step | |
2514 | */ | |
2515 | switch (this->eccmode) { | |
2516 | case NAND_ECC_HW12_2048: | |
2517 | this->eccbytes += 4; | |
2518 | case NAND_ECC_HW8_512: | |
2519 | this->eccbytes += 2; | |
2520 | case NAND_ECC_HW6_512: | |
2521 | this->eccbytes += 3; | |
2522 | case NAND_ECC_HW3_512: | |
2523 | case NAND_ECC_HW3_256: | |
2524 | if (this->calculate_ecc && this->correct_data && this->enable_hwecc) | |
2525 | break; | |
2526 | printk (KERN_WARNING "No ECC functions supplied, Hardware ECC not possible\n"); | |
2527 | BUG(); | |
2528 | } | |
2529 | ||
2530 | mtd->eccsize = this->eccsize; | |
2531 | ||
2532 | /* Set the number of read / write steps for one page to ensure ECC generation */ | |
2533 | switch (this->eccmode) { | |
2534 | case NAND_ECC_HW12_2048: | |
2535 | this->eccsteps = mtd->oobblock / 2048; | |
2536 | break; | |
2537 | case NAND_ECC_HW3_512: | |
2538 | case NAND_ECC_HW6_512: | |
2539 | case NAND_ECC_HW8_512: | |
2540 | this->eccsteps = mtd->oobblock / 512; | |
2541 | break; | |
2542 | case NAND_ECC_HW3_256: | |
2543 | case NAND_ECC_SOFT: | |
2544 | this->eccsteps = mtd->oobblock / 256; | |
2545 | break; | |
2546 | ||
2547 | case NAND_ECC_NONE: | |
2548 | this->eccsteps = 1; | |
2549 | break; | |
2550 | } | |
2551 | ||
2552 | /* Initialize state, waitqueue and spinlock */ | |
2553 | this->state = FL_READY; | |
2554 | init_waitqueue_head (&this->wq); | |
2555 | spin_lock_init (&this->chip_lock); | |
2556 | ||
2557 | /* De-select the device */ | |
2558 | this->select_chip(mtd, -1); | |
2559 | ||
2560 | /* Invalidate the pagebuffer reference */ | |
2561 | this->pagebuf = -1; | |
2562 | ||
2563 | /* Fill in remaining MTD driver data */ | |
2564 | mtd->type = MTD_NANDFLASH; | |
2565 | mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC; | |
2566 | mtd->ecctype = MTD_ECC_SW; | |
2567 | mtd->erase = nand_erase; | |
2568 | mtd->point = NULL; | |
2569 | mtd->unpoint = NULL; | |
2570 | mtd->read = nand_read; | |
2571 | mtd->write = nand_write; | |
2572 | mtd->read_ecc = nand_read_ecc; | |
2573 | mtd->write_ecc = nand_write_ecc; | |
2574 | mtd->read_oob = nand_read_oob; | |
2575 | mtd->write_oob = nand_write_oob; | |
2576 | mtd->readv = NULL; | |
2577 | mtd->writev = nand_writev; | |
2578 | mtd->writev_ecc = nand_writev_ecc; | |
2579 | mtd->sync = nand_sync; | |
2580 | mtd->lock = NULL; | |
2581 | mtd->unlock = NULL; | |
2582 | mtd->suspend = NULL; | |
2583 | mtd->resume = NULL; | |
2584 | mtd->block_isbad = nand_block_isbad; | |
2585 | mtd->block_markbad = nand_block_markbad; | |
2586 | ||
2587 | /* and make the autooob the default one */ | |
2588 | memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo)); | |
2589 | ||
2590 | mtd->owner = THIS_MODULE; | |
2591 | ||
2592 | /* Build bad block table */ | |
2593 | return this->scan_bbt (mtd); | |
2594 | } | |
2595 | ||
2596 | /** | |
2597 | * nand_release - [NAND Interface] Free resources held by the NAND device | |
2598 | * @mtd: MTD device structure | |
2599 | */ | |
2600 | void nand_release (struct mtd_info *mtd) | |
2601 | { | |
2602 | struct nand_chip *this = mtd->priv; | |
2603 | ||
2604 | #ifdef CONFIG_MTD_PARTITIONS | |
2605 | /* Deregister partitions */ | |
2606 | del_mtd_partitions (mtd); | |
2607 | #endif | |
2608 | /* Deregister the device */ | |
2609 | del_mtd_device (mtd); | |
2610 | ||
2611 | /* Free bad block table memory, if allocated */ | |
2612 | if (this->bbt) | |
2613 | kfree (this->bbt); | |
2614 | /* Buffer allocated by nand_scan ? */ | |
2615 | if (this->options & NAND_OOBBUF_ALLOC) | |
2616 | kfree (this->oob_buf); | |
2617 | /* Buffer allocated by nand_scan ? */ | |
2618 | if (this->options & NAND_DATABUF_ALLOC) | |
2619 | kfree (this->data_buf); | |
2620 | } | |
2621 | ||
2622 | EXPORT_SYMBOL (nand_scan); | |
2623 | EXPORT_SYMBOL (nand_release); | |
2624 | ||
2625 | MODULE_LICENSE ("GPL"); | |
2626 | MODULE_AUTHOR ("Steven J. Hill <sjhill@realitydiluted.com>, Thomas Gleixner <tglx@linutronix.de>"); | |
2627 | MODULE_DESCRIPTION ("Generic NAND flash driver code"); |