?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
USB: Convert ohci-pnx4008 to a new-style i2c driver
[linux-2.6/mini2440.git] / drivers / mtd / nand / nand_base.c
blob0a9c9cd33f96b0f15f7f1d6f87260baaf9fb05df
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/doc/nand.html
11 *
12 * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
13 * 2002-2006 Thomas Gleixner (tglx@linutronix.de)
14 *
15 * Credits:
16 * David Woodhouse for adding multichip support
17 *
18 * Aleph One Ltd. and Toby Churchill Ltd. for supporting the
19 * rework for 2K page size chips
20 *
21 * TODO:
22 * Enable cached programming for 2k page size chips
23 * Check, if mtd->ecctype should be set to MTD_ECC_HW
24 * if we have HW ecc support.
25 * The AG-AND chips have nice features for speed improvement,
26 * which are not supported yet. Read / program 4 pages in one go.
27 * BBT table is not serialized, has to be fixed
28 *
29 * This program is free software; you can redistribute it and/or modify
30 * it under the terms of the GNU General Public License version 2 as
31 * published by the Free Software Foundation.
32 *
33 */
34
35 #include <linux/module.h>
36 #include <linux/delay.h>
37 #include <linux/errno.h>
38 #include <linux/err.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/types.h>
42 #include <linux/mtd/mtd.h>
43 #include <linux/mtd/nand.h>
44 #include <linux/mtd/nand_ecc.h>
45 #include <linux/mtd/compatmac.h>
46 #include <linux/interrupt.h>
47 #include <linux/bitops.h>
48 #include <linux/leds.h>
49 #include <asm/io.h>
50
51 #ifdef CONFIG_MTD_PARTITIONS
52 #include <linux/mtd/partitions.h>
53 #endif
54
55 /* Define default oob placement schemes for large and small page devices */
56 static struct nand_ecclayout nand_oob_8 = {
57 .eccbytes = 3,
58 .eccpos = {0, 1, 2},
59 .oobfree = {
60 {.offset = 3,
61 .length = 2},
62 {.offset = 6,
63 .length = 2}}
64 };
65
66 static struct nand_ecclayout nand_oob_16 = {
67 .eccbytes = 6,
68 .eccpos = {0, 1, 2, 3, 6, 7},
69 .oobfree = {
70 {.offset = 8,
71 . length = 8}}
72 };
73
74 static struct nand_ecclayout nand_oob_64 = {
75 .eccbytes = 24,
76 .eccpos = {
77 40, 41, 42, 43, 44, 45, 46, 47,
78 48, 49, 50, 51, 52, 53, 54, 55,
79 56, 57, 58, 59, 60, 61, 62, 63},
80 .oobfree = {
81 {.offset = 2,
82 .length = 38}}
83 };
84
85 static int nand_get_device(struct nand_chip *chip, struct mtd_info *mtd,
86 int new_state);
87
88 static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
89 struct mtd_oob_ops *ops);
90
91 /*
92 * For devices which display every fart in the system on a separate LED. Is
93 * compiled away when LED support is disabled.
94 */
95 DEFINE_LED_TRIGGER(nand_led_trigger);
96
97 /**
98 * nand_release_device - [GENERIC] release chip
99 * @mtd: MTD device structure
100 *
101 * Deselect, release chip lock and wake up anyone waiting on the device
102 */
103 static void nand_release_device(struct mtd_info *mtd)
104 {
105 struct nand_chip *chip = mtd->priv;
106
107 /* De-select the NAND device */
108 chip->select_chip(mtd, -1);
109
110 /* Release the controller and the chip */
111 spin_lock(&chip->controller->lock);
112 chip->controller->active = NULL;
113 chip->state = FL_READY;
114 wake_up(&chip->controller->wq);
115 spin_unlock(&chip->controller->lock);
116 }
117
118 /**
119 * nand_read_byte - [DEFAULT] read one byte from the chip
120 * @mtd: MTD device structure
121 *
122 * Default read function for 8bit buswith
123 */
124 static uint8_t nand_read_byte(struct mtd_info *mtd)
125 {
126 struct nand_chip *chip = mtd->priv;
127 return readb(chip->IO_ADDR_R);
128 }
129
130 /**
131 * nand_read_byte16 - [DEFAULT] read one byte endianess aware from the chip
132 * @mtd: MTD device structure
133 *
134 * Default read function for 16bit buswith with
135 * endianess conversion
136 */
137 static uint8_t nand_read_byte16(struct mtd_info *mtd)
138 {
139 struct nand_chip *chip = mtd->priv;
140 return (uint8_t) cpu_to_le16(readw(chip->IO_ADDR_R));
141 }
142
143 /**
144 * nand_read_word - [DEFAULT] read one word from the chip
145 * @mtd: MTD device structure
146 *
147 * Default read function for 16bit buswith without
148 * endianess conversion
149 */
150 static u16 nand_read_word(struct mtd_info *mtd)
151 {
152 struct nand_chip *chip = mtd->priv;
153 return readw(chip->IO_ADDR_R);
154 }
155
156 /**
157 * nand_select_chip - [DEFAULT] control CE line
158 * @mtd: MTD device structure
159 * @chipnr: chipnumber to select, -1 for deselect
160 *
161 * Default select function for 1 chip devices.
162 */
163 static void nand_select_chip(struct mtd_info *mtd, int chipnr)
164 {
165 struct nand_chip *chip = mtd->priv;
166
167 switch (chipnr) {
168 case -1:
169 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
170 break;
171 case 0:
172 break;
173
174 default:
175 BUG();
176 }
177 }
178
179 /**
180 * nand_write_buf - [DEFAULT] write buffer to chip
181 * @mtd: MTD device structure
182 * @buf: data buffer
183 * @len: number of bytes to write
184 *
185 * Default write function for 8bit buswith
186 */
187 static void nand_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
188 {
189 int i;
190 struct nand_chip *chip = mtd->priv;
191
192 for (i = 0; i < len; i++)
193 writeb(buf[i], chip->IO_ADDR_W);
194 }
195
196 /**
197 * nand_read_buf - [DEFAULT] read chip data into buffer
198 * @mtd: MTD device structure
199 * @buf: buffer to store date
200 * @len: number of bytes to read
201 *
202 * Default read function for 8bit buswith
203 */
204 static void nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
205 {
206 int i;
207 struct nand_chip *chip = mtd->priv;
208
209 for (i = 0; i < len; i++)
210 buf[i] = readb(chip->IO_ADDR_R);
211 }
212
213 /**
214 * nand_verify_buf - [DEFAULT] Verify chip data against buffer
215 * @mtd: MTD device structure
216 * @buf: buffer containing the data to compare
217 * @len: number of bytes to compare
218 *
219 * Default verify function for 8bit buswith
220 */
221 static int nand_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
222 {
223 int i;
224 struct nand_chip *chip = mtd->priv;
225
226 for (i = 0; i < len; i++)
227 if (buf[i] != readb(chip->IO_ADDR_R))
228 return -EFAULT;
229 return 0;
230 }
231
232 /**
233 * nand_write_buf16 - [DEFAULT] write buffer to chip
234 * @mtd: MTD device structure
235 * @buf: data buffer
236 * @len: number of bytes to write
237 *
238 * Default write function for 16bit buswith
239 */
240 static void nand_write_buf16(struct mtd_info *mtd, const uint8_t *buf, int len)
241 {
242 int i;
243 struct nand_chip *chip = mtd->priv;
244 u16 *p = (u16 *) buf;
245 len >>= 1;
246
247 for (i = 0; i < len; i++)
248 writew(p[i], chip->IO_ADDR_W);
249
250 }
251
252 /**
253 * nand_read_buf16 - [DEFAULT] read chip data into buffer
254 * @mtd: MTD device structure
255 * @buf: buffer to store date
256 * @len: number of bytes to read
257 *
258 * Default read function for 16bit buswith
259 */
260 static void nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len)
261 {
262 int i;
263 struct nand_chip *chip = mtd->priv;
264 u16 *p = (u16 *) buf;
265 len >>= 1;
266
267 for (i = 0; i < len; i++)
268 p[i] = readw(chip->IO_ADDR_R);
269 }
270
271 /**
272 * nand_verify_buf16 - [DEFAULT] Verify chip data against buffer
273 * @mtd: MTD device structure
274 * @buf: buffer containing the data to compare
275 * @len: number of bytes to compare
276 *
277 * Default verify function for 16bit buswith
278 */
279 static int nand_verify_buf16(struct mtd_info *mtd, const uint8_t *buf, int len)
280 {
281 int i;
282 struct nand_chip *chip = mtd->priv;
283 u16 *p = (u16 *) buf;
284 len >>= 1;
285
286 for (i = 0; i < len; i++)
287 if (p[i] != readw(chip->IO_ADDR_R))
288 return -EFAULT;
289
290 return 0;
291 }
292
293 /**
294 * nand_block_bad - [DEFAULT] Read bad block marker from the chip
295 * @mtd: MTD device structure
296 * @ofs: offset from device start
297 * @getchip: 0, if the chip is already selected
298 *
299 * Check, if the block is bad.
300 */
301 static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
302 {
303 int page, chipnr, res = 0;
304 struct nand_chip *chip = mtd->priv;
305 u16 bad;
306
307 page = (int)(ofs >> chip->page_shift) & chip->pagemask;
308
309 if (getchip) {
310 chipnr = (int)(ofs >> chip->chip_shift);
311
312 nand_get_device(chip, mtd, FL_READING);
313
314 /* Select the NAND device */
315 chip->select_chip(mtd, chipnr);
316 }
317
318 if (chip->options & NAND_BUSWIDTH_16) {
319 chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos & 0xFE,
320 page);
321 bad = cpu_to_le16(chip->read_word(mtd));
322 if (chip->badblockpos & 0x1)
323 bad >>= 8;
324 if ((bad & 0xFF) != 0xff)
325 res = 1;
326 } else {
327 chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos, page);
328 if (chip->read_byte(mtd) != 0xff)
329 res = 1;
330 }
331
332 if (getchip)
333 nand_release_device(mtd);
334
335 return res;
336 }
337
338 /**
339 * nand_default_block_markbad - [DEFAULT] mark a block bad
340 * @mtd: MTD device structure
341 * @ofs: offset from device start
342 *
343 * This is the default implementation, which can be overridden by
344 * a hardware specific driver.
345 */
346 static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
347 {
348 struct nand_chip *chip = mtd->priv;
349 uint8_t buf[2] = { 0, 0 };
350 int block, ret;
351
352 /* Get block number */
353 block = (int)(ofs >> chip->bbt_erase_shift);
354 if (chip->bbt)
355 chip->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
356
357 /* Do we have a flash based bad block table ? */
358 if (chip->options & NAND_USE_FLASH_BBT)
359 ret = nand_update_bbt(mtd, ofs);
360 else {
361 /* We write two bytes, so we dont have to mess with 16 bit
362 * access
363 */
364 nand_get_device(chip, mtd, FL_WRITING);
365 ofs += mtd->oobsize;
366 chip->ops.len = chip->ops.ooblen = 2;
367 chip->ops.datbuf = NULL;
368 chip->ops.oobbuf = buf;
369 chip->ops.ooboffs = chip->badblockpos & ~0x01;
370
371 ret = nand_do_write_oob(mtd, ofs, &chip->ops);
372 nand_release_device(mtd);
373 }
374 if (!ret)
375 mtd->ecc_stats.badblocks++;
376
377 return ret;
378 }
379
380 /**
381 * nand_check_wp - [GENERIC] check if the chip is write protected
382 * @mtd: MTD device structure
383 * Check, if the device is write protected
384 *
385 * The function expects, that the device is already selected
386 */
387 static int nand_check_wp(struct mtd_info *mtd)
388 {
389 struct nand_chip *chip = mtd->priv;
390 /* Check the WP bit */
391 chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
392 return (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1;
393 }
394
395 /**
396 * nand_block_checkbad - [GENERIC] Check if a block is marked bad
397 * @mtd: MTD device structure
398 * @ofs: offset from device start
399 * @getchip: 0, if the chip is already selected
400 * @allowbbt: 1, if its allowed to access the bbt area
401 *
402 * Check, if the block is bad. Either by reading the bad block table or
403 * calling of the scan function.
404 */
405 static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip,
406 int allowbbt)
407 {
408 struct nand_chip *chip = mtd->priv;
409
410 if (!chip->bbt)
411 return chip->block_bad(mtd, ofs, getchip);
412
413 /* Return info from the table */
414 return nand_isbad_bbt(mtd, ofs, allowbbt);
415 }
416
417 /*
418 * Wait for the ready pin, after a command
419 * The timeout is catched later.
420 */
421 void nand_wait_ready(struct mtd_info *mtd)
422 {
423 struct nand_chip *chip = mtd->priv;
424 unsigned long timeo = jiffies + 2;
425
426 led_trigger_event(nand_led_trigger, LED_FULL);
427 /* wait until command is processed or timeout occures */
428 do {
429 if (chip->dev_ready(mtd))
430 break;
431 touch_softlockup_watchdog();
432 } while (time_before(jiffies, timeo));
433 led_trigger_event(nand_led_trigger, LED_OFF);
434 }
435 EXPORT_SYMBOL_GPL(nand_wait_ready);
436
437 /**
438 * nand_command - [DEFAULT] Send command to NAND device
439 * @mtd: MTD device structure
440 * @command: the command to be sent
441 * @column: the column address for this command, -1 if none
442 * @page_addr: the page address for this command, -1 if none
443 *
444 * Send command to NAND device. This function is used for small page
445 * devices (256/512 Bytes per page)
446 */
447 static void nand_command(struct mtd_info *mtd, unsigned int command,
448 int column, int page_addr)
449 {
450 register struct nand_chip *chip = mtd->priv;
451 int ctrl = NAND_CTRL_CLE | NAND_CTRL_CHANGE;
452
453 /*
454 * Write out the command to the device.
455 */
456 if (command == NAND_CMD_SEQIN) {
457 int readcmd;
458
459 if (column >= mtd->writesize) {
460 /* OOB area */
461 column -= mtd->writesize;
462 readcmd = NAND_CMD_READOOB;
463 } else if (column < 256) {
464 /* First 256 bytes --> READ0 */
465 readcmd = NAND_CMD_READ0;
466 } else {
467 column -= 256;
468 readcmd = NAND_CMD_READ1;
469 }
470 chip->cmd_ctrl(mtd, readcmd, ctrl);
471 ctrl &= ~NAND_CTRL_CHANGE;
472 }
473 chip->cmd_ctrl(mtd, command, ctrl);
474
475 /*
476 * Address cycle, when necessary
477 */
478 ctrl = NAND_CTRL_ALE | NAND_CTRL_CHANGE;
479 /* Serially input address */
480 if (column != -1) {
481 /* Adjust columns for 16 bit buswidth */
482 if (chip->options & NAND_BUSWIDTH_16)
483 column >>= 1;
484 chip->cmd_ctrl(mtd, column, ctrl);
485 ctrl &= ~NAND_CTRL_CHANGE;
486 }
487 if (page_addr != -1) {
488 chip->cmd_ctrl(mtd, page_addr, ctrl);
489 ctrl &= ~NAND_CTRL_CHANGE;
490 chip->cmd_ctrl(mtd, page_addr >> 8, ctrl);
491 /* One more address cycle for devices > 32MiB */
492 if (chip->chipsize > (32 << 20))
493 chip->cmd_ctrl(mtd, page_addr >> 16, ctrl);
494 }
495 chip->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
496
497 /*
498 * program and erase have their own busy handlers
499 * status and sequential in needs no delay
500 */
501 switch (command) {
502
503 case NAND_CMD_PAGEPROG:
504 case NAND_CMD_ERASE1:
505 case NAND_CMD_ERASE2:
506 case NAND_CMD_SEQIN:
507 case NAND_CMD_STATUS:
508 return;
509
510 case NAND_CMD_RESET:
511 if (chip->dev_ready)
512 break;
513 udelay(chip->chip_delay);
514 chip->cmd_ctrl(mtd, NAND_CMD_STATUS,
515 NAND_CTRL_CLE | NAND_CTRL_CHANGE);
516 chip->cmd_ctrl(mtd,
517 NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
518 while (!(chip->read_byte(mtd) & NAND_STATUS_READY)) ;
519 return;
520
521 /* This applies to read commands */
522 default:
523 /*
524 * If we don't have access to the busy pin, we apply the given
525 * command delay
526 */
527 if (!chip->dev_ready) {
528 udelay(chip->chip_delay);
529 return;
530 }
531 }
532 /* Apply this short delay always to ensure that we do wait tWB in
533 * any case on any machine. */
534 ndelay(100);
535
536 nand_wait_ready(mtd);
537 }
538
539 /**
540 * nand_command_lp - [DEFAULT] Send command to NAND large page device
541 * @mtd: MTD device structure
542 * @command: the command to be sent
543 * @column: the column address for this command, -1 if none
544 * @page_addr: the page address for this command, -1 if none
545 *
546 * Send command to NAND device. This is the version for the new large page
547 * devices We dont have the separate regions as we have in the small page
548 * devices. We must emulate NAND_CMD_READOOB to keep the code compatible.
549 */
550 static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
551 int column, int page_addr)
552 {
553 register struct nand_chip *chip = mtd->priv;
554
555 /* Emulate NAND_CMD_READOOB */
556 if (command == NAND_CMD_READOOB) {
557 column += mtd->writesize;
558 command = NAND_CMD_READ0;
559 }
560
561 /* Command latch cycle */
562 chip->cmd_ctrl(mtd, command & 0xff,
563 NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
564
565 if (column != -1 || page_addr != -1) {
566 int ctrl = NAND_CTRL_CHANGE | NAND_NCE | NAND_ALE;
567
568 /* Serially input address */
569 if (column != -1) {
570 /* Adjust columns for 16 bit buswidth */
571 if (chip->options & NAND_BUSWIDTH_16)
572 column >>= 1;
573 chip->cmd_ctrl(mtd, column, ctrl);
574 ctrl &= ~NAND_CTRL_CHANGE;
575 chip->cmd_ctrl(mtd, column >> 8, ctrl);
576 }
577 if (page_addr != -1) {
578 chip->cmd_ctrl(mtd, page_addr, ctrl);
579 chip->cmd_ctrl(mtd, page_addr >> 8,
580 NAND_NCE | NAND_ALE);
581 /* One more address cycle for devices > 128MiB */
582 if (chip->chipsize > (128 << 20))
583 chip->cmd_ctrl(mtd, page_addr >> 16,
584 NAND_NCE | NAND_ALE);
585 }
586 }
587 chip->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
588
589 /*
590 * program and erase have their own busy handlers
591 * status, sequential in, and deplete1 need no delay
592 */
593 switch (command) {
594
595 case NAND_CMD_CACHEDPROG:
596 case NAND_CMD_PAGEPROG:
597 case NAND_CMD_ERASE1:
598 case NAND_CMD_ERASE2:
599 case NAND_CMD_SEQIN:
600 case NAND_CMD_RNDIN:
601 case NAND_CMD_STATUS:
602 case NAND_CMD_DEPLETE1:
603 return;
604
605 /*
606 * read error status commands require only a short delay
607 */
608 case NAND_CMD_STATUS_ERROR:
609 case NAND_CMD_STATUS_ERROR0:
610 case NAND_CMD_STATUS_ERROR1:
611 case NAND_CMD_STATUS_ERROR2:
612 case NAND_CMD_STATUS_ERROR3:
613 udelay(chip->chip_delay);
614 return;
615
616 case NAND_CMD_RESET:
617 if (chip->dev_ready)
618 break;
619 udelay(chip->chip_delay);
620 chip->cmd_ctrl(mtd, NAND_CMD_STATUS,
621 NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
622 chip->cmd_ctrl(mtd, NAND_CMD_NONE,
623 NAND_NCE | NAND_CTRL_CHANGE);
624 while (!(chip->read_byte(mtd) & NAND_STATUS_READY)) ;
625 return;
626
627 case NAND_CMD_RNDOUT:
628 /* No ready / busy check necessary */
629 chip->cmd_ctrl(mtd, NAND_CMD_RNDOUTSTART,
630 NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
631 chip->cmd_ctrl(mtd, NAND_CMD_NONE,
632 NAND_NCE | NAND_CTRL_CHANGE);
633 return;
634
635 case NAND_CMD_READ0:
636 chip->cmd_ctrl(mtd, NAND_CMD_READSTART,
637 NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
638 chip->cmd_ctrl(mtd, NAND_CMD_NONE,
639 NAND_NCE | NAND_CTRL_CHANGE);
640
641 /* This applies to read commands */
642 default:
643 /*
644 * If we don't have access to the busy pin, we apply the given
645 * command delay
646 */
647 if (!chip->dev_ready) {
648 udelay(chip->chip_delay);
649 return;
650 }
651 }
652
653 /* Apply this short delay always to ensure that we do wait tWB in
654 * any case on any machine. */
655 ndelay(100);
656
657 nand_wait_ready(mtd);
658 }
659
660 /**
661 * nand_get_device - [GENERIC] Get chip for selected access
662 * @chip: the nand chip descriptor
663 * @mtd: MTD device structure
664 * @new_state: the state which is requested
665 *
666 * Get the device and lock it for exclusive access
667 */
668 static int
669 nand_get_device(struct nand_chip *chip, struct mtd_info *mtd, int new_state)
670 {
671 spinlock_t *lock = &chip->controller->lock;
672 wait_queue_head_t *wq = &chip->controller->wq;
673 DECLARE_WAITQUEUE(wait, current);
674 retry:
675 spin_lock(lock);
676
677 /* Hardware controller shared among independend devices */
678 /* Hardware controller shared among independend devices */
679 if (!chip->controller->active)
680 chip->controller->active = chip;
681
682 if (chip->controller->active == chip && chip->state == FL_READY) {
683 chip->state = new_state;
684 spin_unlock(lock);
685 return 0;
686 }
687 if (new_state == FL_PM_SUSPENDED) {
688 spin_unlock(lock);
689 return (chip->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
690 }
691 set_current_state(TASK_UNINTERRUPTIBLE);
692 add_wait_queue(wq, &wait);
693 spin_unlock(lock);
694 schedule();
695 remove_wait_queue(wq, &wait);
696 goto retry;
697 }
698
699 /**
700 * nand_wait - [DEFAULT] wait until the command is done
701 * @mtd: MTD device structure
702 * @chip: NAND chip structure
703 *
704 * Wait for command done. This applies to erase and program only
705 * Erase can take up to 400ms and program up to 20ms according to
706 * general NAND and SmartMedia specs
707 */
708 static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
709 {
710
711 unsigned long timeo = jiffies;
712 int status, state = chip->state;
713
714 if (state == FL_ERASING)
715 timeo += (HZ * 400) / 1000;
716 else
717 timeo += (HZ * 20) / 1000;
718
719 led_trigger_event(nand_led_trigger, LED_FULL);
720
721 /* Apply this short delay always to ensure that we do wait tWB in
722 * any case on any machine. */
723 ndelay(100);
724
725 if ((state == FL_ERASING) && (chip->options & NAND_IS_AND))
726 chip->cmdfunc(mtd, NAND_CMD_STATUS_MULTI, -1, -1);
727 else
728 chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
729
730 while (time_before(jiffies, timeo)) {
731 if (chip->dev_ready) {
732 if (chip->dev_ready(mtd))
733 break;
734 } else {
735 if (chip->read_byte(mtd) & NAND_STATUS_READY)
736 break;
737 }
738 cond_resched();
739 }
740 led_trigger_event(nand_led_trigger, LED_OFF);
741
742 status = (int)chip->read_byte(mtd);
743 return status;
744 }
745
746 /**
747 * nand_read_page_raw - [Intern] read raw page data without ecc
748 * @mtd: mtd info structure
749 * @chip: nand chip info structure
750 * @buf: buffer to store read data
751 */
752 static int nand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
753 uint8_t *buf)
754 {
755 chip->read_buf(mtd, buf, mtd->writesize);
756 chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
757 return 0;
758 }
759
760 /**
761 * nand_read_page_swecc - [REPLACABLE] software ecc based page read function
762 * @mtd: mtd info structure
763 * @chip: nand chip info structure
764 * @buf: buffer to store read data
765 */
766 static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
767 uint8_t *buf)
768 {
769 int i, eccsize = chip->ecc.size;
770 int eccbytes = chip->ecc.bytes;
771 int eccsteps = chip->ecc.steps;
772 uint8_t *p = buf;
773 uint8_t *ecc_calc = chip->buffers->ecccalc;
774 uint8_t *ecc_code = chip->buffers->ecccode;
775 uint32_t *eccpos = chip->ecc.layout->eccpos;
776
777 chip->ecc.read_page_raw(mtd, chip, buf);
778
779 for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
780 chip->ecc.calculate(mtd, p, &ecc_calc[i]);
781
782 for (i = 0; i < chip->ecc.total; i++)
783 ecc_code[i] = chip->oob_poi[eccpos[i]];
784
785 eccsteps = chip->ecc.steps;
786 p = buf;
787
788 for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
789 int stat;
790
791 stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
792 if (stat < 0)
793 mtd->ecc_stats.failed++;
794 else
795 mtd->ecc_stats.corrected += stat;
796 }
797 return 0;
798 }
799
800 /**
801 * nand_read_subpage - [REPLACABLE] software ecc based sub-page read function
802 * @mtd: mtd info structure
803 * @chip: nand chip info structure
804 * @data_offs: offset of requested data within the page
805 * @readlen: data length
806 * @bufpoi: buffer to store read data
807 */
808 static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip, uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi)
809 {
810 int start_step, end_step, num_steps;
811 uint32_t *eccpos = chip->ecc.layout->eccpos;
812 uint8_t *p;
813 int data_col_addr, i, gaps = 0;
814 int datafrag_len, eccfrag_len, aligned_len, aligned_pos;
815 int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1;
816
817 /* Column address wihin the page aligned to ECC size (256bytes). */
818 start_step = data_offs / chip->ecc.size;
819 end_step = (data_offs + readlen - 1) / chip->ecc.size;
820 num_steps = end_step - start_step + 1;
821
822 /* Data size aligned to ECC ecc.size*/
823 datafrag_len = num_steps * chip->ecc.size;
824 eccfrag_len = num_steps * chip->ecc.bytes;
825
826 data_col_addr = start_step * chip->ecc.size;
827 /* If we read not a page aligned data */
828 if (data_col_addr != 0)
829 chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1);
830
831 p = bufpoi + data_col_addr;
832 chip->read_buf(mtd, p, datafrag_len);
833
834 /* Calculate ECC */
835 for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size)
836 chip->ecc.calculate(mtd, p, &chip->buffers->ecccalc[i]);
837
838 /* The performance is faster if to position offsets
839 according to ecc.pos. Let make sure here that
840 there are no gaps in ecc positions */
841 for (i = 0; i < eccfrag_len - 1; i++) {
842 if (eccpos[i + start_step * chip->ecc.bytes] + 1 !=
843 eccpos[i + start_step * chip->ecc.bytes + 1]) {
844 gaps = 1;
845 break;
846 }
847 }
848 if (gaps) {
849 chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
850 chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
851 } else {
852 /* send the command to read the particular ecc bytes */
853 /* take care about buswidth alignment in read_buf */
854 aligned_pos = eccpos[start_step * chip->ecc.bytes] & ~(busw - 1);
855 aligned_len = eccfrag_len;
856 if (eccpos[start_step * chip->ecc.bytes] & (busw - 1))
857 aligned_len++;
858 if (eccpos[(start_step + num_steps) * chip->ecc.bytes] & (busw - 1))
859 aligned_len++;
860
861 chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize + aligned_pos, -1);
862 chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len);
863 }
864
865 for (i = 0; i < eccfrag_len; i++)
866 chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + start_step * chip->ecc.bytes]];
867
868 p = bufpoi + data_col_addr;
869 for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) {
870 int stat;
871
872 stat = chip->ecc.correct(mtd, p, &chip->buffers->ecccode[i], &chip->buffers->ecccalc[i]);
873 if (stat == -1)
874 mtd->ecc_stats.failed++;
875 else
876 mtd->ecc_stats.corrected += stat;
877 }
878 return 0;
879 }
880
881 /**
882 * nand_read_page_hwecc - [REPLACABLE] hardware ecc based page read function
883 * @mtd: mtd info structure
884 * @chip: nand chip info structure
885 * @buf: buffer to store read data
886 *
887 * Not for syndrome calculating ecc controllers which need a special oob layout
888 */
889 static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
890 uint8_t *buf)
891 {
892 int i, eccsize = chip->ecc.size;
893 int eccbytes = chip->ecc.bytes;
894 int eccsteps = chip->ecc.steps;
895 uint8_t *p = buf;
896 uint8_t *ecc_calc = chip->buffers->ecccalc;
897 uint8_t *ecc_code = chip->buffers->ecccode;
898 uint32_t *eccpos = chip->ecc.layout->eccpos;
899
900 for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
901 chip->ecc.hwctl(mtd, NAND_ECC_READ);
902 chip->read_buf(mtd, p, eccsize);
903 chip->ecc.calculate(mtd, p, &ecc_calc[i]);
904 }
905 chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
906
907 for (i = 0; i < chip->ecc.total; i++)
908 ecc_code[i] = chip->oob_poi[eccpos[i]];
909
910 eccsteps = chip->ecc.steps;
911 p = buf;
912
913 for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
914 int stat;
915
916 stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
917 if (stat < 0)
918 mtd->ecc_stats.failed++;
919 else
920 mtd->ecc_stats.corrected += stat;
921 }
922 return 0;
923 }
924
925 /**
926 * nand_read_page_syndrome - [REPLACABLE] hardware ecc syndrom based page read
927 * @mtd: mtd info structure
928 * @chip: nand chip info structure
929 * @buf: buffer to store read data
930 *
931 * The hw generator calculates the error syndrome automatically. Therefor
932 * we need a special oob layout and handling.
933 */
934 static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
935 uint8_t *buf)
936 {
937 int i, eccsize = chip->ecc.size;
938 int eccbytes = chip->ecc.bytes;
939 int eccsteps = chip->ecc.steps;
940 uint8_t *p = buf;
941 uint8_t *oob = chip->oob_poi;
942
943 for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
944 int stat;
945
946 chip->ecc.hwctl(mtd, NAND_ECC_READ);
947 chip->read_buf(mtd, p, eccsize);
948
949 if (chip->ecc.prepad) {
950 chip->read_buf(mtd, oob, chip->ecc.prepad);
951 oob += chip->ecc.prepad;
952 }
953
954 chip->ecc.hwctl(mtd, NAND_ECC_READSYN);
955 chip->read_buf(mtd, oob, eccbytes);
956 stat = chip->ecc.correct(mtd, p, oob, NULL);
957
958 if (stat < 0)
959 mtd->ecc_stats.failed++;
960 else
961 mtd->ecc_stats.corrected += stat;
962
963 oob += eccbytes;
964
965 if (chip->ecc.postpad) {
966 chip->read_buf(mtd, oob, chip->ecc.postpad);
967 oob += chip->ecc.postpad;
968 }
969 }
970
971 /* Calculate remaining oob bytes */
972 i = mtd->oobsize - (oob - chip->oob_poi);
973 if (i)
974 chip->read_buf(mtd, oob, i);
975
976 return 0;
977 }
978
979 /**
980 * nand_transfer_oob - [Internal] Transfer oob to client buffer
981 * @chip: nand chip structure
982 * @oob: oob destination address
983 * @ops: oob ops structure
984 * @len: size of oob to transfer
985 */
986 static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
987 struct mtd_oob_ops *ops, size_t len)
988 {
989 switch(ops->mode) {
990
991 case MTD_OOB_PLACE:
992 case MTD_OOB_RAW:
993 memcpy(oob, chip->oob_poi + ops->ooboffs, len);
994 return oob + len;
995
996 case MTD_OOB_AUTO: {
997 struct nand_oobfree *free = chip->ecc.layout->oobfree;
998 uint32_t boffs = 0, roffs = ops->ooboffs;
999 size_t bytes = 0;
1000
1001 for(; free->length && len; free++, len -= bytes) {
1002 /* Read request not from offset 0 ? */
1003 if (unlikely(roffs)) {
1004 if (roffs >= free->length) {
1005 roffs -= free->length;
1006 continue;
1007 }
1008 boffs = free->offset + roffs;
1009 bytes = min_t(size_t, len,
1010 (free->length - roffs));
1011 roffs = 0;
1012 } else {
1013 bytes = min_t(size_t, len, free->length);
1014 boffs = free->offset;
1015 }
1016 memcpy(oob, chip->oob_poi + boffs, bytes);
1017 oob += bytes;
1018 }
1019 return oob;
1020 }
1021 default:
1022 BUG();
1023 }
1024 return NULL;
1025 }
1026
1027 /**
1028 * nand_do_read_ops - [Internal] Read data with ECC
1029 *
1030 * @mtd: MTD device structure
1031 * @from: offset to read from
1032 * @ops: oob ops structure
1033 *
1034 * Internal function. Called with chip held.
1035 */
1036 static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
1037 struct mtd_oob_ops *ops)
1038 {
1039 int chipnr, page, realpage, col, bytes, aligned;
1040 struct nand_chip *chip = mtd->priv;
1041 struct mtd_ecc_stats stats;
1042 int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
1043 int sndcmd = 1;
1044 int ret = 0;
1045 uint32_t readlen = ops->len;
1046 uint32_t oobreadlen = ops->ooblen;
1047 uint8_t *bufpoi, *oob, *buf;
1048
1049 stats = mtd->ecc_stats;
1050
1051 chipnr = (int)(from >> chip->chip_shift);
1052 chip->select_chip(mtd, chipnr);
1053
1054 realpage = (int)(from >> chip->page_shift);
1055 page = realpage & chip->pagemask;
1056
1057 col = (int)(from & (mtd->writesize - 1));
1058
1059 buf = ops->datbuf;
1060 oob = ops->oobbuf;
1061
1062 while(1) {
1063 bytes = min(mtd->writesize - col, readlen);
1064 aligned = (bytes == mtd->writesize);
1065
1066 /* Is the current page in the buffer ? */
1067 if (realpage != chip->pagebuf || oob) {
1068 bufpoi = aligned ? buf : chip->buffers->databuf;
1069
1070 if (likely(sndcmd)) {
1071 chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
1072 sndcmd = 0;
1073 }
1074
1075 /* Now read the page into the buffer */
1076 if (unlikely(ops->mode == MTD_OOB_RAW))
1077 ret = chip->ecc.read_page_raw(mtd, chip, bufpoi);
1078 else if (!aligned && NAND_SUBPAGE_READ(chip) && !oob)
1079 ret = chip->ecc.read_subpage(mtd, chip, col, bytes, bufpoi);
1080 else
1081 ret = chip->ecc.read_page(mtd, chip, bufpoi);
1082 if (ret < 0)
1083 break;
1084
1085 /* Transfer not aligned data */
1086 if (!aligned) {
1087 if (!NAND_SUBPAGE_READ(chip) && !oob)
1088 chip->pagebuf = realpage;
1089 memcpy(buf, chip->buffers->databuf + col, bytes);
1090 }
1091
1092 buf += bytes;
1093
1094 if (unlikely(oob)) {
1095 /* Raw mode does data:oob:data:oob */
1096 if (ops->mode != MTD_OOB_RAW) {
1097 int toread = min(oobreadlen,
1098 chip->ecc.layout->oobavail);
1099 if (toread) {
1100 oob = nand_transfer_oob(chip,
1101 oob, ops, toread);
1102 oobreadlen -= toread;
1103 }
1104 } else
1105 buf = nand_transfer_oob(chip,
1106 buf, ops, mtd->oobsize);
1107 }
1108
1109 if (!(chip->options & NAND_NO_READRDY)) {
1110 /*
1111 * Apply delay or wait for ready/busy pin. Do
1112 * this before the AUTOINCR check, so no
1113 * problems arise if a chip which does auto
1114 * increment is marked as NOAUTOINCR by the
1115 * board driver.
1116 */
1117 if (!chip->dev_ready)
1118 udelay(chip->chip_delay);
1119 else
1120 nand_wait_ready(mtd);
1121 }
1122 } else {
1123 memcpy(buf, chip->buffers->databuf + col, bytes);
1124 buf += bytes;
1125 }
1126
1127 readlen -= bytes;
1128
1129 if (!readlen)
1130 break;
1131
1132 /* For subsequent reads align to page boundary. */
1133 col = 0;
1134 /* Increment page address */
1135 realpage++;
1136
1137 page = realpage & chip->pagemask;
1138 /* Check, if we cross a chip boundary */
1139 if (!page) {
1140 chipnr++;
1141 chip->select_chip(mtd, -1);
1142 chip->select_chip(mtd, chipnr);
1143 }
1144
1145 /* Check, if the chip supports auto page increment
1146 * or if we have hit a block boundary.
1147 */
1148 if (!NAND_CANAUTOINCR(chip) || !(page & blkcheck))
1149 sndcmd = 1;
1150 }
1151
1152 ops->retlen = ops->len - (size_t) readlen;
1153 if (oob)
1154 ops->oobretlen = ops->ooblen - oobreadlen;
1155
1156 if (ret)
1157 return ret;
1158
1159 if (mtd->ecc_stats.failed - stats.failed)
1160 return -EBADMSG;
1161
1162 return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
1163 }
1164
1165 /**
1166 * nand_read - [MTD Interface] MTD compability function for nand_do_read_ecc
1167 * @mtd: MTD device structure
1168 * @from: offset to read from
1169 * @len: number of bytes to read
1170 * @retlen: pointer to variable to store the number of read bytes
1171 * @buf: the databuffer to put data
1172 *
1173 * Get hold of the chip and call nand_do_read
1174 */
1175 static int nand_read(struct mtd_info *mtd, loff_t from, size_t len,
1176 size_t *retlen, uint8_t *buf)
1177 {
1178 struct nand_chip *chip = mtd->priv;
1179 int ret;
1180
1181 /* Do not allow reads past end of device */
1182 if ((from + len) > mtd->size)
1183 return -EINVAL;
1184 if (!len)
1185 return 0;
1186
1187 nand_get_device(chip, mtd, FL_READING);
1188
1189 chip->ops.len = len;
1190 chip->ops.datbuf = buf;
1191 chip->ops.oobbuf = NULL;
1192
1193 ret = nand_do_read_ops(mtd, from, &chip->ops);
1194
1195 *retlen = chip->ops.retlen;
1196
1197 nand_release_device(mtd);
1198
1199 return ret;
1200 }
1201
1202 /**
1203 * nand_read_oob_std - [REPLACABLE] the most common OOB data read function
1204 * @mtd: mtd info structure
1205 * @chip: nand chip info structure
1206 * @page: page number to read
1207 * @sndcmd: flag whether to issue read command or not
1208 */
1209 static int nand_read_oob_std(struct mtd_info *mtd, struct nand_chip *chip,
1210 int page, int sndcmd)
1211 {
1212 if (sndcmd) {
1213 chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
1214 sndcmd = 0;
1215 }
1216 chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
1217 return sndcmd;
1218 }
1219
1220 /**
1221 * nand_read_oob_syndrome - [REPLACABLE] OOB data read function for HW ECC
1222 * with syndromes
1223 * @mtd: mtd info structure
1224 * @chip: nand chip info structure
1225 * @page: page number to read
1226 * @sndcmd: flag whether to issue read command or not
1227 */
1228 static int nand_read_oob_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
1229 int page, int sndcmd)
1230 {
1231 uint8_t *buf = chip->oob_poi;
1232 int length = mtd->oobsize;
1233 int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
1234 int eccsize = chip->ecc.size;
1235 uint8_t *bufpoi = buf;
1236 int i, toread, sndrnd = 0, pos;
1237
1238 chip->cmdfunc(mtd, NAND_CMD_READ0, chip->ecc.size, page);
1239 for (i = 0; i < chip->ecc.steps; i++) {
1240 if (sndrnd) {
1241 pos = eccsize + i * (eccsize + chunk);
1242 if (mtd->writesize > 512)
1243 chip->cmdfunc(mtd, NAND_CMD_RNDOUT, pos, -1);
1244 else
1245 chip->cmdfunc(mtd, NAND_CMD_READ0, pos, page);
1246 } else
1247 sndrnd = 1;
1248 toread = min_t(int, length, chunk);
1249 chip->read_buf(mtd, bufpoi, toread);
1250 bufpoi += toread;
1251 length -= toread;
1252 }
1253 if (length > 0)
1254 chip->read_buf(mtd, bufpoi, length);
1255
1256 return 1;
1257 }
1258
1259 /**
1260 * nand_write_oob_std - [REPLACABLE] the most common OOB data write function
1261 * @mtd: mtd info structure
1262 * @chip: nand chip info structure
1263 * @page: page number to write
1264 */
1265 static int nand_write_oob_std(struct mtd_info *mtd, struct nand_chip *chip,
1266 int page)
1267 {
1268 int status = 0;
1269 const uint8_t *buf = chip->oob_poi;
1270 int length = mtd->oobsize;
1271
1272 chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
1273 chip->write_buf(mtd, buf, length);
1274 /* Send command to program the OOB data */
1275 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
1276
1277 status = chip->waitfunc(mtd, chip);
1278
1279 return status & NAND_STATUS_FAIL ? -EIO : 0;
1280 }
1281
1282 /**
1283 * nand_write_oob_syndrome - [REPLACABLE] OOB data write function for HW ECC
1284 * with syndrome - only for large page flash !
1285 * @mtd: mtd info structure
1286 * @chip: nand chip info structure
1287 * @page: page number to write
1288 */
1289 static int nand_write_oob_syndrome(struct mtd_info *mtd,
1290 struct nand_chip *chip, int page)
1291 {
1292 int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
1293 int eccsize = chip->ecc.size, length = mtd->oobsize;
1294 int i, len, pos, status = 0, sndcmd = 0, steps = chip->ecc.steps;
1295 const uint8_t *bufpoi = chip->oob_poi;
1296
1297 /*
1298 * data-ecc-data-ecc ... ecc-oob
1299 * or
1300 * data-pad-ecc-pad-data-pad .... ecc-pad-oob
1301 */
1302 if (!chip->ecc.prepad && !chip->ecc.postpad) {
1303 pos = steps * (eccsize + chunk);
1304 steps = 0;
1305 } else
1306 pos = eccsize;
1307
1308 chip->cmdfunc(mtd, NAND_CMD_SEQIN, pos, page);
1309 for (i = 0; i < steps; i++) {
1310 if (sndcmd) {
1311 if (mtd->writesize <= 512) {
1312 uint32_t fill = 0xFFFFFFFF;
1313
1314 len = eccsize;
1315 while (len > 0) {
1316 int num = min_t(int, len, 4);
1317 chip->write_buf(mtd, (uint8_t *)&fill,
1318 num);
1319 len -= num;
1320 }
1321 } else {
1322 pos = eccsize + i * (eccsize + chunk);
1323 chip->cmdfunc(mtd, NAND_CMD_RNDIN, pos, -1);
1324 }
1325 } else
1326 sndcmd = 1;
1327 len = min_t(int, length, chunk);
1328 chip->write_buf(mtd, bufpoi, len);
1329 bufpoi += len;
1330 length -= len;
1331 }
1332 if (length > 0)
1333 chip->write_buf(mtd, bufpoi, length);
1334
1335 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
1336 status = chip->waitfunc(mtd, chip);
1337
1338 return status & NAND_STATUS_FAIL ? -EIO : 0;
1339 }
1340
1341 /**
1342 * nand_do_read_oob - [Intern] NAND read out-of-band
1343 * @mtd: MTD device structure
1344 * @from: offset to read from
1345 * @ops: oob operations description structure
1346 *
1347 * NAND read out-of-band data from the spare area
1348 */
1349 static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
1350 struct mtd_oob_ops *ops)
1351 {
1352 int page, realpage, chipnr, sndcmd = 1;
1353 struct nand_chip *chip = mtd->priv;
1354 int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
1355 int readlen = ops->ooblen;
1356 int len;
1357 uint8_t *buf = ops->oobbuf;
1358
1359 DEBUG(MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08Lx, len = %i\n",
1360 (unsigned long long)from, readlen);
1361
1362 if (ops->mode == MTD_OOB_AUTO)
1363 len = chip->ecc.layout->oobavail;
1364 else
1365 len = mtd->oobsize;
1366
1367 if (unlikely(ops->ooboffs >= len)) {
1368 DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
1369 "Attempt to start read outside oob\n");
1370 return -EINVAL;
1371 }
1372
1373 /* Do not allow reads past end of device */
1374 if (unlikely(from >= mtd->size ||
1375 ops->ooboffs + readlen > ((mtd->size >> chip->page_shift) -
1376 (from >> chip->page_shift)) * len)) {
1377 DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
1378 "Attempt read beyond end of device\n");
1379 return -EINVAL;
1380 }
1381
1382 chipnr = (int)(from >> chip->chip_shift);
1383 chip->select_chip(mtd, chipnr);
1384
1385 /* Shift to get page */
1386 realpage = (int)(from >> chip->page_shift);
1387 page = realpage & chip->pagemask;
1388
1389 while(1) {
1390 sndcmd = chip->ecc.read_oob(mtd, chip, page, sndcmd);
1391
1392 len = min(len, readlen);
1393 buf = nand_transfer_oob(chip, buf, ops, len);
1394
1395 if (!(chip->options & NAND_NO_READRDY)) {
1396 /*
1397 * Apply delay or wait for ready/busy pin. Do this
1398 * before the AUTOINCR check, so no problems arise if a
1399 * chip which does auto increment is marked as
1400 * NOAUTOINCR by the board driver.
1401 */
1402 if (!chip->dev_ready)
1403 udelay(chip->chip_delay);
1404 else
1405 nand_wait_ready(mtd);
1406 }
1407
1408 readlen -= len;
1409 if (!readlen)
1410 break;
1411
1412 /* Increment page address */
1413 realpage++;
1414
1415 page = realpage & chip->pagemask;
1416 /* Check, if we cross a chip boundary */
1417 if (!page) {
1418 chipnr++;
1419 chip->select_chip(mtd, -1);
1420 chip->select_chip(mtd, chipnr);
1421 }
1422
1423 /* Check, if the chip supports auto page increment
1424 * or if we have hit a block boundary.
1425 */
1426 if (!NAND_CANAUTOINCR(chip) || !(page & blkcheck))
1427 sndcmd = 1;
1428 }
1429
1430 ops->oobretlen = ops->ooblen;
1431 return 0;
1432 }
1433
1434 /**
1435 * nand_read_oob - [MTD Interface] NAND read data and/or out-of-band
1436 * @mtd: MTD device structure
1437 * @from: offset to read from
1438 * @ops: oob operation description structure
1439 *
1440 * NAND read data and/or out-of-band data
1441 */
1442 static int nand_read_oob(struct mtd_info *mtd, loff_t from,
1443 struct mtd_oob_ops *ops)
1444 {
1445 struct nand_chip *chip = mtd->priv;
1446 int ret = -ENOTSUPP;
1447
1448 ops->retlen = 0;
1449
1450 /* Do not allow reads past end of device */
1451 if (ops->datbuf && (from + ops->len) > mtd->size) {
1452 DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
1453 "Attempt read beyond end of device\n");
1454 return -EINVAL;
1455 }
1456
1457 nand_get_device(chip, mtd, FL_READING);
1458
1459 switch(ops->mode) {
1460 case MTD_OOB_PLACE:
1461 case MTD_OOB_AUTO:
1462 case MTD_OOB_RAW:
1463 break;
1464
1465 default:
1466 goto out;
1467 }
1468
1469 if (!ops->datbuf)
1470 ret = nand_do_read_oob(mtd, from, ops);
1471 else
1472 ret = nand_do_read_ops(mtd, from, ops);
1473
1474 out:
1475 nand_release_device(mtd);
1476 return ret;
1477 }
1478
1479
1480 /**
1481 * nand_write_page_raw - [Intern] raw page write function
1482 * @mtd: mtd info structure
1483 * @chip: nand chip info structure
1484 * @buf: data buffer
1485 */
1486 static void nand_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
1487 const uint8_t *buf)
1488 {
1489 chip->write_buf(mtd, buf, mtd->writesize);
1490 chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
1491 }
1492
1493 /**
1494 * nand_write_page_swecc - [REPLACABLE] software ecc based page write function
1495 * @mtd: mtd info structure
1496 * @chip: nand chip info structure
1497 * @buf: data buffer
1498 */
1499 static void nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
1500 const uint8_t *buf)
1501 {
1502 int i, eccsize = chip->ecc.size;
1503 int eccbytes = chip->ecc.bytes;
1504 int eccsteps = chip->ecc.steps;
1505 uint8_t *ecc_calc = chip->buffers->ecccalc;
1506 const uint8_t *p = buf;
1507 uint32_t *eccpos = chip->ecc.layout->eccpos;
1508
1509 /* Software ecc calculation */
1510 for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
1511 chip->ecc.calculate(mtd, p, &ecc_calc[i]);
1512
1513 for (i = 0; i < chip->ecc.total; i++)
1514 chip->oob_poi[eccpos[i]] = ecc_calc[i];
1515
1516 chip->ecc.write_page_raw(mtd, chip, buf);
1517 }
1518
1519 /**
1520 * nand_write_page_hwecc - [REPLACABLE] hardware ecc based page write function
1521 * @mtd: mtd info structure
1522 * @chip: nand chip info structure
1523 * @buf: data buffer
1524 */
1525 static void nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
1526 const uint8_t *buf)
1527 {
1528 int i, eccsize = chip->ecc.size;
1529 int eccbytes = chip->ecc.bytes;
1530 int eccsteps = chip->ecc.steps;
1531 uint8_t *ecc_calc = chip->buffers->ecccalc;
1532 const uint8_t *p = buf;
1533 uint32_t *eccpos = chip->ecc.layout->eccpos;
1534
1535 for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
1536 chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
1537 chip->write_buf(mtd, p, eccsize);
1538 chip->ecc.calculate(mtd, p, &ecc_calc[i]);
1539 }
1540
1541 for (i = 0; i < chip->ecc.total; i++)
1542 chip->oob_poi[eccpos[i]] = ecc_calc[i];
1543
1544 chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
1545 }
1546
1547 /**
1548 * nand_write_page_syndrome - [REPLACABLE] hardware ecc syndrom based page write
1549 * @mtd: mtd info structure
1550 * @chip: nand chip info structure
1551 * @buf: data buffer
1552 *
1553 * The hw generator calculates the error syndrome automatically. Therefor
1554 * we need a special oob layout and handling.
1555 */
1556 static void nand_write_page_syndrome(struct mtd_info *mtd,
1557 struct nand_chip *chip, const uint8_t *buf)
1558 {
1559 int i, eccsize = chip->ecc.size;
1560 int eccbytes = chip->ecc.bytes;
1561 int eccsteps = chip->ecc.steps;
1562 const uint8_t *p = buf;
1563 uint8_t *oob = chip->oob_poi;
1564
1565 for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
1566
1567 chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
1568 chip->write_buf(mtd, p, eccsize);
1569
1570 if (chip->ecc.prepad) {
1571 chip->write_buf(mtd, oob, chip->ecc.prepad);
1572 oob += chip->ecc.prepad;
1573 }
1574
1575 chip->ecc.calculate(mtd, p, oob);
1576 chip->write_buf(mtd, oob, eccbytes);
1577 oob += eccbytes;
1578
1579 if (chip->ecc.postpad) {
1580 chip->write_buf(mtd, oob, chip->ecc.postpad);
1581 oob += chip->ecc.postpad;
1582 }
1583 }
1584
1585 /* Calculate remaining oob bytes */
1586 i = mtd->oobsize - (oob - chip->oob_poi);
1587 if (i)
1588 chip->write_buf(mtd, oob, i);
1589 }
1590
1591 /**
1592 * nand_write_page - [REPLACEABLE] write one page
1593 * @mtd: MTD device structure
1594 * @chip: NAND chip descriptor
1595 * @buf: the data to write
1596 * @page: page number to write
1597 * @cached: cached programming
1598 * @raw: use _raw version of write_page
1599 */
1600 static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
1601 const uint8_t *buf, int page, int cached, int raw)
1602 {
1603 int status;
1604
1605 chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
1606
1607 if (unlikely(raw))
1608 chip->ecc.write_page_raw(mtd, chip, buf);
1609 else
1610 chip->ecc.write_page(mtd, chip, buf);
1611
1612 /*
1613 * Cached progamming disabled for now, Not sure if its worth the
1614 * trouble. The speed gain is not very impressive. (2.3->2.6Mib/s)
1615 */
1616 cached = 0;
1617
1618 if (!cached || !(chip->options & NAND_CACHEPRG)) {
1619
1620 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
1621 status = chip->waitfunc(mtd, chip);
1622 /*
1623 * See if operation failed and additional status checks are
1624 * available
1625 */
1626 if ((status & NAND_STATUS_FAIL) && (chip->errstat))
1627 status = chip->errstat(mtd, chip, FL_WRITING, status,
1628 page);
1629
1630 if (status & NAND_STATUS_FAIL)
1631 return -EIO;
1632 } else {
1633 chip->cmdfunc(mtd, NAND_CMD_CACHEDPROG, -1, -1);
1634 status = chip->waitfunc(mtd, chip);
1635 }
1636
1637 #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
1638 /* Send command to read back the data */
1639 chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
1640
1641 if (chip->verify_buf(mtd, buf, mtd->writesize))
1642 return -EIO;
1643 #endif
1644 return 0;
1645 }
1646
1647 /**
1648 * nand_fill_oob - [Internal] Transfer client buffer to oob
1649 * @chip: nand chip structure
1650 * @oob: oob data buffer
1651 * @ops: oob ops structure
1652 */
1653 static uint8_t *nand_fill_oob(struct nand_chip *chip, uint8_t *oob,
1654 struct mtd_oob_ops *ops)
1655 {
1656 size_t len = ops->ooblen;
1657
1658 switch(ops->mode) {
1659
1660 case MTD_OOB_PLACE:
1661 case MTD_OOB_RAW:
1662 memcpy(chip->oob_poi + ops->ooboffs, oob, len);
1663 return oob + len;
1664
1665 case MTD_OOB_AUTO: {
1666 struct nand_oobfree *free = chip->ecc.layout->oobfree;
1667 uint32_t boffs = 0, woffs = ops->ooboffs;
1668 size_t bytes = 0;
1669
1670 for(; free->length && len; free++, len -= bytes) {
1671 /* Write request not from offset 0 ? */
1672 if (unlikely(woffs)) {
1673 if (woffs >= free->length) {
1674 woffs -= free->length;
1675 continue;
1676 }
1677 boffs = free->offset + woffs;
1678 bytes = min_t(size_t, len,
1679 (free->length - woffs));
1680 woffs = 0;
1681 } else {
1682 bytes = min_t(size_t, len, free->length);
1683 boffs = free->offset;
1684 }
1685 memcpy(chip->oob_poi + boffs, oob, bytes);
1686 oob += bytes;
1687 }
1688 return oob;
1689 }
1690 default:
1691 BUG();
1692 }
1693 return NULL;
1694 }
1695
1696 #define NOTALIGNED(x) (x & (chip->subpagesize - 1)) != 0
1697
1698 /**
1699 * nand_do_write_ops - [Internal] NAND write with ECC
1700 * @mtd: MTD device structure
1701 * @to: offset to write to
1702 * @ops: oob operations description structure
1703 *
1704 * NAND write with ECC
1705 */
1706 static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
1707 struct mtd_oob_ops *ops)
1708 {
1709 int chipnr, realpage, page, blockmask, column;
1710 struct nand_chip *chip = mtd->priv;
1711 uint32_t writelen = ops->len;
1712 uint8_t *oob = ops->oobbuf;
1713 uint8_t *buf = ops->datbuf;
1714 int ret, subpage;
1715
1716 ops->retlen = 0;
1717 if (!writelen)
1718 return 0;
1719
1720 /* reject writes, which are not page aligned */
1721 if (NOTALIGNED(to) || NOTALIGNED(ops->len)) {
1722 printk(KERN_NOTICE "nand_write: "
1723 "Attempt to write not page aligned data\n");
1724 return -EINVAL;
1725 }
1726
1727 column = to & (mtd->writesize - 1);
1728 subpage = column || (writelen & (mtd->writesize - 1));
1729
1730 if (subpage && oob)
1731 return -EINVAL;
1732
1733 chipnr = (int)(to >> chip->chip_shift);
1734 chip->select_chip(mtd, chipnr);
1735
1736 /* Check, if it is write protected */
1737 if (nand_check_wp(mtd))
1738 return -EIO;
1739
1740 realpage = (int)(to >> chip->page_shift);
1741 page = realpage & chip->pagemask;
1742 blockmask = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
1743
1744 /* Invalidate the page cache, when we write to the cached page */
1745 if (to <= (chip->pagebuf << chip->page_shift) &&
1746 (chip->pagebuf << chip->page_shift) < (to + ops->len))
1747 chip->pagebuf = -1;
1748
1749 /* If we're not given explicit OOB data, let it be 0xFF */
1750 if (likely(!oob))
1751 memset(chip->oob_poi, 0xff, mtd->oobsize);
1752
1753 while(1) {
1754 int bytes = mtd->writesize;
1755 int cached = writelen > bytes && page != blockmask;
1756 uint8_t *wbuf = buf;
1757
1758 /* Partial page write ? */
1759 if (unlikely(column || writelen < (mtd->writesize - 1))) {
1760 cached = 0;
1761 bytes = min_t(int, bytes - column, (int) writelen);
1762 chip->pagebuf = -1;
1763 memset(chip->buffers->databuf, 0xff, mtd->writesize);
1764 memcpy(&chip->buffers->databuf[column], buf, bytes);
1765 wbuf = chip->buffers->databuf;
1766 }
1767
1768 if (unlikely(oob))
1769 oob = nand_fill_oob(chip, oob, ops);
1770
1771 ret = chip->write_page(mtd, chip, wbuf, page, cached,
1772 (ops->mode == MTD_OOB_RAW));
1773 if (ret)
1774 break;
1775
1776 writelen -= bytes;
1777 if (!writelen)
1778 break;
1779
1780 column = 0;
1781 buf += bytes;
1782 realpage++;
1783
1784 page = realpage & chip->pagemask;
1785 /* Check, if we cross a chip boundary */
1786 if (!page) {
1787 chipnr++;
1788 chip->select_chip(mtd, -1);
1789 chip->select_chip(mtd, chipnr);
1790 }
1791 }
1792
1793 ops->retlen = ops->len - writelen;
1794 if (unlikely(oob))
1795 ops->oobretlen = ops->ooblen;
1796 return ret;
1797 }
1798
1799 /**
1800 * nand_write - [MTD Interface] NAND write with ECC
1801 * @mtd: MTD device structure
1802 * @to: offset to write to
1803 * @len: number of bytes to write
1804 * @retlen: pointer to variable to store the number of written bytes
1805 * @buf: the data to write
1806 *
1807 * NAND write with ECC
1808 */
1809 static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,
1810 size_t *retlen, const uint8_t *buf)
1811 {
1812 struct nand_chip *chip = mtd->priv;
1813 int ret;
1814
1815 /* Do not allow reads past end of device */
1816 if ((to + len) > mtd->size)
1817 return -EINVAL;
1818 if (!len)
1819 return 0;
1820
1821 nand_get_device(chip, mtd, FL_WRITING);
1822
1823 chip->ops.len = len;
1824 chip->ops.datbuf = (uint8_t *)buf;
1825 chip->ops.oobbuf = NULL;
1826
1827 ret = nand_do_write_ops(mtd, to, &chip->ops);
1828
1829 *retlen = chip->ops.retlen;
1830
1831 nand_release_device(mtd);
1832
1833 return ret;
1834 }
1835
1836 /**
1837 * nand_do_write_oob - [MTD Interface] NAND write out-of-band
1838 * @mtd: MTD device structure
1839 * @to: offset to write to
1840 * @ops: oob operation description structure
1841 *
1842 * NAND write out-of-band
1843 */
1844 static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
1845 struct mtd_oob_ops *ops)
1846 {
1847 int chipnr, page, status, len;
1848 struct nand_chip *chip = mtd->priv;
1849
1850 DEBUG(MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n",
1851 (unsigned int)to, (int)ops->ooblen);
1852
1853 if (ops->mode == MTD_OOB_AUTO)
1854 len = chip->ecc.layout->oobavail;
1855 else
1856 len = mtd->oobsize;
1857
1858 /* Do not allow write past end of page */
1859 if ((ops->ooboffs + ops->ooblen) > len) {
1860 DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: "
1861 "Attempt to write past end of page\n");
1862 return -EINVAL;
1863 }
1864
1865 if (unlikely(ops->ooboffs >= len)) {
1866 DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
1867 "Attempt to start write outside oob\n");
1868 return -EINVAL;
1869 }
1870
1871 /* Do not allow reads past end of device */
1872 if (unlikely(to >= mtd->size ||
1873 ops->ooboffs + ops->ooblen >
1874 ((mtd->size >> chip->page_shift) -
1875 (to >> chip->page_shift)) * len)) {
1876 DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
1877 "Attempt write beyond end of device\n");
1878 return -EINVAL;
1879 }
1880
1881 chipnr = (int)(to >> chip->chip_shift);
1882 chip->select_chip(mtd, chipnr);
1883
1884 /* Shift to get page */
1885 page = (int)(to >> chip->page_shift);
1886
1887 /*
1888 * Reset the chip. Some chips (like the Toshiba TC5832DC found in one
1889 * of my DiskOnChip 2000 test units) will clear the whole data page too
1890 * if we don't do this. I have no clue why, but I seem to have 'fixed'
1891 * it in the doc2000 driver in August 1999. dwmw2.
1892 */
1893 chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
1894
1895 /* Check, if it is write protected */
1896 if (nand_check_wp(mtd))
1897 return -EROFS;
1898
1899 /* Invalidate the page cache, if we write to the cached page */
1900 if (page == chip->pagebuf)
1901 chip->pagebuf = -1;
1902
1903 memset(chip->oob_poi, 0xff, mtd->oobsize);
1904 nand_fill_oob(chip, ops->oobbuf, ops);
1905 status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask);
1906 memset(chip->oob_poi, 0xff, mtd->oobsize);
1907
1908 if (status)
1909 return status;
1910
1911 ops->oobretlen = ops->ooblen;
1912
1913 return 0;
1914 }
1915
1916 /**
1917 * nand_write_oob - [MTD Interface] NAND write data and/or out-of-band
1918 * @mtd: MTD device structure
1919 * @to: offset to write to
1920 * @ops: oob operation description structure
1921 */
1922 static int nand_write_oob(struct mtd_info *mtd, loff_t to,
1923 struct mtd_oob_ops *ops)
1924 {
1925 struct nand_chip *chip = mtd->priv;
1926 int ret = -ENOTSUPP;
1927
1928 ops->retlen = 0;
1929
1930 /* Do not allow writes past end of device */
1931 if (ops->datbuf && (to + ops->len) > mtd->size) {
1932 DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
1933 "Attempt read beyond end of device\n");
1934 return -EINVAL;
1935 }
1936
1937 nand_get_device(chip, mtd, FL_WRITING);
1938
1939 switch(ops->mode) {
1940 case MTD_OOB_PLACE:
1941 case MTD_OOB_AUTO:
1942 case MTD_OOB_RAW:
1943 break;
1944
1945 default:
1946 goto out;
1947 }
1948
1949 if (!ops->datbuf)
1950 ret = nand_do_write_oob(mtd, to, ops);
1951 else
1952 ret = nand_do_write_ops(mtd, to, ops);
1953
1954 out:
1955 nand_release_device(mtd);
1956 return ret;
1957 }
1958
1959 /**
1960 * single_erease_cmd - [GENERIC] NAND standard block erase command function
1961 * @mtd: MTD device structure
1962 * @page: the page address of the block which will be erased
1963 *
1964 * Standard erase command for NAND chips
1965 */
1966 static void single_erase_cmd(struct mtd_info *mtd, int page)
1967 {
1968 struct nand_chip *chip = mtd->priv;
1969 /* Send commands to erase a block */
1970 chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
1971 chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
1972 }
1973
1974 /**
1975 * multi_erease_cmd - [GENERIC] AND specific block erase command function
1976 * @mtd: MTD device structure
1977 * @page: the page address of the block which will be erased
1978 *
1979 * AND multi block erase command function
1980 * Erase 4 consecutive blocks
1981 */
1982 static void multi_erase_cmd(struct mtd_info *mtd, int page)
1983 {
1984 struct nand_chip *chip = mtd->priv;
1985 /* Send commands to erase a block */
1986 chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++);
1987 chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++);
1988 chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page++);
1989 chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
1990 chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
1991 }
1992
1993 /**
1994 * nand_erase - [MTD Interface] erase block(s)
1995 * @mtd: MTD device structure
1996 * @instr: erase instruction
1997 *
1998 * Erase one ore more blocks
1999 */
2000 static int nand_erase(struct mtd_info *mtd, struct erase_info *instr)
2001 {
2002 return nand_erase_nand(mtd, instr, 0);
2003 }
2004
2005 #define BBT_PAGE_MASK 0xffffff3f
2006 /**
2007 * nand_erase_nand - [Internal] erase block(s)
2008 * @mtd: MTD device structure
2009 * @instr: erase instruction
2010 * @allowbbt: allow erasing the bbt area
2011 *
2012 * Erase one ore more blocks
2013 */
2014 int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
2015 int allowbbt)
2016 {
2017 int page, len, status, pages_per_block, ret, chipnr;
2018 struct nand_chip *chip = mtd->priv;
2019 int rewrite_bbt[NAND_MAX_CHIPS]={0};
2020 unsigned int bbt_masked_page = 0xffffffff;
2021
2022 DEBUG(MTD_DEBUG_LEVEL3, "nand_erase: start = 0x%08x, len = %i\n",
2023 (unsigned int)instr->addr, (unsigned int)instr->len);
2024
2025 /* Start address must align on block boundary */
2026 if (instr->addr & ((1 << chip->phys_erase_shift) - 1)) {
2027 DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: Unaligned address\n");
2028 return -EINVAL;
2029 }
2030
2031 /* Length must align on block boundary */
2032 if (instr->len & ((1 << chip->phys_erase_shift) - 1)) {
2033 DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: "
2034 "Length not block aligned\n");
2035 return -EINVAL;
2036 }
2037
2038 /* Do not allow erase past end of device */
2039 if ((instr->len + instr->addr) > mtd->size) {
2040 DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: "
2041 "Erase past end of device\n");
2042 return -EINVAL;
2043 }
2044
2045 instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
2046
2047 /* Grab the lock and see if the device is available */
2048 nand_get_device(chip, mtd, FL_ERASING);
2049
2050 /* Shift to get first page */
2051 page = (int)(instr->addr >> chip->page_shift);
2052 chipnr = (int)(instr->addr >> chip->chip_shift);
2053
2054 /* Calculate pages in each block */
2055 pages_per_block = 1 << (chip->phys_erase_shift - chip->page_shift);
2056
2057 /* Select the NAND device */
2058 chip->select_chip(mtd, chipnr);
2059
2060 /* Check, if it is write protected */
2061 if (nand_check_wp(mtd)) {
2062 DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: "
2063 "Device is write protected!!!\n");
2064 instr->state = MTD_ERASE_FAILED;
2065 goto erase_exit;
2066 }
2067
2068 /*
2069 * If BBT requires refresh, set the BBT page mask to see if the BBT
2070 * should be rewritten. Otherwise the mask is set to 0xffffffff which
2071 * can not be matched. This is also done when the bbt is actually
2072 * erased to avoid recusrsive updates
2073 */
2074 if (chip->options & BBT_AUTO_REFRESH && !allowbbt)
2075 bbt_masked_page = chip->bbt_td->pages[chipnr] & BBT_PAGE_MASK;
2076
2077 /* Loop through the pages */
2078 len = instr->len;
2079
2080 instr->state = MTD_ERASING;
2081
2082 while (len) {
2083 /*
2084 * heck if we have a bad block, we do not erase bad blocks !
2085 */
2086 if (nand_block_checkbad(mtd, ((loff_t) page) <<
2087 chip->page_shift, 0, allowbbt)) {
2088 printk(KERN_WARNING "nand_erase: attempt to erase a "
2089 "bad block at page 0x%08x\n", page);
2090 instr->state = MTD_ERASE_FAILED;
2091 goto erase_exit;
2092 }
2093
2094 /*
2095 * Invalidate the page cache, if we erase the block which
2096 * contains the current cached page
2097 */
2098 if (page <= chip->pagebuf && chip->pagebuf <
2099 (page + pages_per_block))
2100 chip->pagebuf = -1;
2101
2102 chip->erase_cmd(mtd, page & chip->pagemask);
2103
2104 status = chip->waitfunc(mtd, chip);
2105
2106 /*
2107 * See if operation failed and additional status checks are
2108 * available
2109 */
2110 if ((status & NAND_STATUS_FAIL) && (chip->errstat))
2111 status = chip->errstat(mtd, chip, FL_ERASING,
2112 status, page);
2113
2114 /* See if block erase succeeded */
2115 if (status & NAND_STATUS_FAIL) {
2116 DEBUG(MTD_DEBUG_LEVEL0, "nand_erase: "
2117 "Failed erase, page 0x%08x\n", page);
2118 instr->state = MTD_ERASE_FAILED;
2119 instr->fail_addr = (page << chip->page_shift);
2120 goto erase_exit;
2121 }
2122
2123 /*
2124 * If BBT requires refresh, set the BBT rewrite flag to the
2125 * page being erased
2126 */
2127 if (bbt_masked_page != 0xffffffff &&
2128 (page & BBT_PAGE_MASK) == bbt_masked_page)
2129 rewrite_bbt[chipnr] = (page << chip->page_shift);
2130
2131 /* Increment page address and decrement length */
2132 len -= (1 << chip->phys_erase_shift);
2133 page += pages_per_block;
2134
2135 /* Check, if we cross a chip boundary */
2136 if (len && !(page & chip->pagemask)) {
2137 chipnr++;
2138 chip->select_chip(mtd, -1);
2139 chip->select_chip(mtd, chipnr);
2140
2141 /*
2142 * If BBT requires refresh and BBT-PERCHIP, set the BBT
2143 * page mask to see if this BBT should be rewritten
2144 */
2145 if (bbt_masked_page != 0xffffffff &&
2146 (chip->bbt_td->options & NAND_BBT_PERCHIP))
2147 bbt_masked_page = chip->bbt_td->pages[chipnr] &
2148 BBT_PAGE_MASK;
2149 }
2150 }
2151 instr->state = MTD_ERASE_DONE;
2152
2153 erase_exit:
2154
2155 ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
2156
2157 /* Deselect and wake up anyone waiting on the device */
2158 nand_release_device(mtd);
2159
2160 /* Do call back function */
2161 if (!ret)
2162 mtd_erase_callback(instr);
2163
2164 /*
2165 * If BBT requires refresh and erase was successful, rewrite any
2166 * selected bad block tables
2167 */
2168 if (bbt_masked_page == 0xffffffff || ret)
2169 return ret;
2170
2171 for (chipnr = 0; chipnr < chip->numchips; chipnr++) {
2172 if (!rewrite_bbt[chipnr])
2173 continue;
2174 /* update the BBT for chip */
2175 DEBUG(MTD_DEBUG_LEVEL0, "nand_erase_nand: nand_update_bbt "
2176 "(%d:0x%0x 0x%0x)\n", chipnr, rewrite_bbt[chipnr],
2177 chip->bbt_td->pages[chipnr]);
2178 nand_update_bbt(mtd, rewrite_bbt[chipnr]);
2179 }
2180
2181 /* Return more or less happy */
2182 return ret;
2183 }
2184
2185 /**
2186 * nand_sync - [MTD Interface] sync
2187 * @mtd: MTD device structure
2188 *
2189 * Sync is actually a wait for chip ready function
2190 */
2191 static void nand_sync(struct mtd_info *mtd)
2192 {
2193 struct nand_chip *chip = mtd->priv;
2194
2195 DEBUG(MTD_DEBUG_LEVEL3, "nand_sync: called\n");
2196
2197 /* Grab the lock and see if the device is available */
2198 nand_get_device(chip, mtd, FL_SYNCING);
2199 /* Release it and go back */
2200 nand_release_device(mtd);
2201 }
2202
2203 /**
2204 * nand_block_isbad - [MTD Interface] Check if block at offset is bad
2205 * @mtd: MTD device structure
2206 * @offs: offset relative to mtd start
2207 */
2208 static int nand_block_isbad(struct mtd_info *mtd, loff_t offs)
2209 {
2210 /* Check for invalid offset */
2211 if (offs > mtd->size)
2212 return -EINVAL;
2213
2214 return nand_block_checkbad(mtd, offs, 1, 0);
2215 }
2216
2217 /**
2218 * nand_block_markbad - [MTD Interface] Mark block at the given offset as bad
2219 * @mtd: MTD device structure
2220 * @ofs: offset relative to mtd start
2221 */
2222 static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
2223 {
2224 struct nand_chip *chip = mtd->priv;
2225 int ret;
2226
2227 if ((ret = nand_block_isbad(mtd, ofs))) {
2228 /* If it was bad already, return success and do nothing. */
2229 if (ret > 0)
2230 return 0;
2231 return ret;
2232 }
2233
2234 return chip->block_markbad(mtd, ofs);
2235 }
2236
2237 /**
2238 * nand_suspend - [MTD Interface] Suspend the NAND flash
2239 * @mtd: MTD device structure
2240 */
2241 static int nand_suspend(struct mtd_info *mtd)
2242 {
2243 struct nand_chip *chip = mtd->priv;
2244
2245 return nand_get_device(chip, mtd, FL_PM_SUSPENDED);
2246 }
2247
2248 /**
2249 * nand_resume - [MTD Interface] Resume the NAND flash
2250 * @mtd: MTD device structure
2251 */
2252 static void nand_resume(struct mtd_info *mtd)
2253 {
2254 struct nand_chip *chip = mtd->priv;
2255
2256 if (chip->state == FL_PM_SUSPENDED)
2257 nand_release_device(mtd);
2258 else
2259 printk(KERN_ERR "nand_resume() called for a chip which is not "
2260 "in suspended state\n");
2261 }
2262
2263 /*
2264 * Set default functions
2265 */
2266 static void nand_set_defaults(struct nand_chip *chip, int busw)
2267 {
2268 /* check for proper chip_delay setup, set 20us if not */
2269 if (!chip->chip_delay)
2270 chip->chip_delay = 20;
2271
2272 /* check, if a user supplied command function given */
2273 if (chip->cmdfunc == NULL)
2274 chip->cmdfunc = nand_command;
2275
2276 /* check, if a user supplied wait function given */
2277 if (chip->waitfunc == NULL)
2278 chip->waitfunc = nand_wait;
2279
2280 if (!chip->select_chip)
2281 chip->select_chip = nand_select_chip;
2282 if (!chip->read_byte)
2283 chip->read_byte = busw ? nand_read_byte16 : nand_read_byte;
2284 if (!chip->read_word)
2285 chip->read_word = nand_read_word;
2286 if (!chip->block_bad)
2287 chip->block_bad = nand_block_bad;
2288 if (!chip->block_markbad)
2289 chip->block_markbad = nand_default_block_markbad;
2290 if (!chip->write_buf)
2291 chip->write_buf = busw ? nand_write_buf16 : nand_write_buf;
2292 if (!chip->read_buf)
2293 chip->read_buf = busw ? nand_read_buf16 : nand_read_buf;
2294 if (!chip->verify_buf)
2295 chip->verify_buf = busw ? nand_verify_buf16 : nand_verify_buf;
2296 if (!chip->scan_bbt)
2297 chip->scan_bbt = nand_default_bbt;
2298
2299 if (!chip->controller) {
2300 chip->controller = &chip->hwcontrol;
2301 spin_lock_init(&chip->controller->lock);
2302 init_waitqueue_head(&chip->controller->wq);
2303 }
2304
2305 }
2306
2307 /*
2308 * Get the flash and manufacturer id and lookup if the type is supported
2309 */
2310 static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
2311 struct nand_chip *chip,
2312 int busw, int *maf_id)
2313 {
2314 struct nand_flash_dev *type = NULL;
2315 int i, dev_id, maf_idx;
2316 int tmp_id, tmp_manf;
2317
2318 /* Select the device */
2319 chip->select_chip(mtd, 0);
2320
2321 /*
2322 * Reset the chip, required by some chips (e.g. Micron MT29FxGxxxxx)
2323 * after power-up
2324 */
2325 chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
2326
2327 /* Send the command for reading device ID */
2328 chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
2329
2330 /* Read manufacturer and device IDs */
2331 *maf_id = chip->read_byte(mtd);
2332 dev_id = chip->read_byte(mtd);
2333
2334 /* Try again to make sure, as some systems the bus-hold or other
2335 * interface concerns can cause random data which looks like a
2336 * possibly credible NAND flash to appear. If the two results do
2337 * not match, ignore the device completely.
2338 */
2339
2340 chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
2341
2342 /* Read manufacturer and device IDs */
2343
2344 tmp_manf = chip->read_byte(mtd);
2345 tmp_id = chip->read_byte(mtd);
2346
2347 if (tmp_manf != *maf_id || tmp_id != dev_id) {
2348 printk(KERN_INFO "%s: second ID read did not match "
2349 "%02x,%02x against %02x,%02x\n", __func__,
2350 *maf_id, dev_id, tmp_manf, tmp_id);
2351 return ERR_PTR(-ENODEV);
2352 }
2353
2354 /* Lookup the flash id */
2355 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
2356 if (dev_id == nand_flash_ids[i].id) {
2357 type = &nand_flash_ids[i];
2358 break;
2359 }
2360 }
2361
2362 if (!type)
2363 return ERR_PTR(-ENODEV);
2364
2365 if (!mtd->name)
2366 mtd->name = type->name;
2367
2368 chip->chipsize = type->chipsize << 20;
2369
2370 /* Newer devices have all the information in additional id bytes */
2371 if (!type->pagesize) {
2372 int extid;
2373 /* The 3rd id byte holds MLC / multichip data */
2374 chip->cellinfo = chip->read_byte(mtd);
2375 /* The 4th id byte is the important one */
2376 extid = chip->read_byte(mtd);
2377 /* Calc pagesize */
2378 mtd->writesize = 1024 << (extid & 0x3);
2379 extid >>= 2;
2380 /* Calc oobsize */
2381 mtd->oobsize = (8 << (extid & 0x01)) * (mtd->writesize >> 9);
2382 extid >>= 2;
2383 /* Calc blocksize. Blocksize is multiples of 64KiB */
2384 mtd->erasesize = (64 * 1024) << (extid & 0x03);
2385 extid >>= 2;
2386 /* Get buswidth information */
2387 busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0;
2388
2389 } else {
2390 /*
2391 * Old devices have chip data hardcoded in the device id table
2392 */
2393 mtd->erasesize = type->erasesize;
2394 mtd->writesize = type->pagesize;
2395 mtd->oobsize = mtd->writesize / 32;
2396 busw = type->options & NAND_BUSWIDTH_16;
2397 }
2398
2399 /* Try to identify manufacturer */
2400 for (maf_idx = 0; nand_manuf_ids[maf_idx].id != 0x0; maf_idx++) {
2401 if (nand_manuf_ids[maf_idx].id == *maf_id)
2402 break;
2403 }
2404
2405 /*
2406 * Check, if buswidth is correct. Hardware drivers should set
2407 * chip correct !
2408 */
2409 if (busw != (chip->options & NAND_BUSWIDTH_16)) {
2410 printk(KERN_INFO "NAND device: Manufacturer ID:"
2411 " 0x%02x, Chip ID: 0x%02x (%s %s)\n", *maf_id,
2412 dev_id, nand_manuf_ids[maf_idx].name, mtd->name);
2413 printk(KERN_WARNING "NAND bus width %d instead %d bit\n",
2414 (chip->options & NAND_BUSWIDTH_16) ? 16 : 8,
2415 busw ? 16 : 8);
2416 return ERR_PTR(-EINVAL);
2417 }
2418
2419 /* Calculate the address shift from the page size */
2420 chip->page_shift = ffs(mtd->writesize) - 1;
2421 /* Convert chipsize to number of pages per chip -1. */
2422 chip->pagemask = (chip->chipsize >> chip->page_shift) - 1;
2423
2424 chip->bbt_erase_shift = chip->phys_erase_shift =
2425 ffs(mtd->erasesize) - 1;
2426 chip->chip_shift = ffs(chip->chipsize) - 1;
2427
2428 /* Set the bad block position */
2429 chip->badblockpos = mtd->writesize > 512 ?
2430 NAND_LARGE_BADBLOCK_POS : NAND_SMALL_BADBLOCK_POS;
2431
2432 /* Get chip options, preserve non chip based options */
2433 chip->options &= ~NAND_CHIPOPTIONS_MSK;
2434 chip->options |= type->options & NAND_CHIPOPTIONS_MSK;
2435
2436 /*
2437 * Set chip as a default. Board drivers can override it, if necessary
2438 */
2439 chip->options |= NAND_NO_AUTOINCR;
2440
2441 /* Check if chip is a not a samsung device. Do not clear the
2442 * options for chips which are not having an extended id.
2443 */
2444 if (*maf_id != NAND_MFR_SAMSUNG && !type->pagesize)
2445 chip->options &= ~NAND_SAMSUNG_LP_OPTIONS;
2446
2447 /* Check for AND chips with 4 page planes */
2448 if (chip->options & NAND_4PAGE_ARRAY)
2449 chip->erase_cmd = multi_erase_cmd;
2450 else
2451 chip->erase_cmd = single_erase_cmd;
2452
2453 /* Do not replace user supplied command function ! */
2454 if (mtd->writesize > 512 && chip->cmdfunc == nand_command)
2455 chip->cmdfunc = nand_command_lp;
2456
2457 printk(KERN_INFO "NAND device: Manufacturer ID:"
2458 " 0x%02x, Chip ID: 0x%02x (%s %s)\n", *maf_id, dev_id,
2459 nand_manuf_ids[maf_idx].name, type->name);
2460
2461 return type;
2462 }
2463
2464 /**
2465 * nand_scan_ident - [NAND Interface] Scan for the NAND device
2466 * @mtd: MTD device structure
2467 * @maxchips: Number of chips to scan for
2468 *
2469 * This is the first phase of the normal nand_scan() function. It
2470 * reads the flash ID and sets up MTD fields accordingly.
2471 *
2472 * The mtd->owner field must be set to the module of the caller.
2473 */
2474 int nand_scan_ident(struct mtd_info *mtd, int maxchips)
2475 {
2476 int i, busw, nand_maf_id;
2477 struct nand_chip *chip = mtd->priv;
2478 struct nand_flash_dev *type;
2479
2480 /* Get buswidth to select the correct functions */
2481 busw = chip->options & NAND_BUSWIDTH_16;
2482 /* Set the default functions */
2483 nand_set_defaults(chip, busw);
2484
2485 /* Read the flash type */
2486 type = nand_get_flash_type(mtd, chip, busw, &nand_maf_id);
2487
2488 if (IS_ERR(type)) {
2489 printk(KERN_WARNING "No NAND device found!!!\n");
2490 chip->select_chip(mtd, -1);
2491 return PTR_ERR(type);
2492 }
2493
2494 /* Check for a chip array */
2495 for (i = 1; i < maxchips; i++) {
2496 chip->select_chip(mtd, i);
2497 /* See comment in nand_get_flash_type for reset */
2498 chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
2499 /* Send the command for reading device ID */
2500 chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
2501 /* Read manufacturer and device IDs */
2502 if (nand_maf_id != chip->read_byte(mtd) ||
2503 type->id != chip->read_byte(mtd))
2504 break;
2505 }
2506 if (i > 1)
2507 printk(KERN_INFO "%d NAND chips detected\n", i);
2508
2509 /* Store the number of chips and calc total size for mtd */
2510 chip->numchips = i;
2511 mtd->size = i * chip->chipsize;
2512
2513 return 0;
2514 }
2515
2516
2517 /**
2518 * nand_scan_tail - [NAND Interface] Scan for the NAND device
2519 * @mtd: MTD device structure
2520 * @maxchips: Number of chips to scan for
2521 *
2522 * This is the second phase of the normal nand_scan() function. It
2523 * fills out all the uninitialized function pointers with the defaults
2524 * and scans for a bad block table if appropriate.
2525 */
2526 int nand_scan_tail(struct mtd_info *mtd)
2527 {
2528 int i;
2529 struct nand_chip *chip = mtd->priv;
2530
2531 if (!(chip->options & NAND_OWN_BUFFERS))
2532 chip->buffers = kmalloc(sizeof(*chip->buffers), GFP_KERNEL);
2533 if (!chip->buffers)
2534 return -ENOMEM;
2535
2536 /* Set the internal oob buffer location, just after the page data */
2537 chip->oob_poi = chip->buffers->databuf + mtd->writesize;
2538
2539 /*
2540 * If no default placement scheme is given, select an appropriate one
2541 */
2542 if (!chip->ecc.layout) {
2543 switch (mtd->oobsize) {
2544 case 8:
2545 chip->ecc.layout = &nand_oob_8;
2546 break;
2547 case 16:
2548 chip->ecc.layout = &nand_oob_16;
2549 break;
2550 case 64:
2551 chip->ecc.layout = &nand_oob_64;
2552 break;
2553 default:
2554 printk(KERN_WARNING "No oob scheme defined for "
2555 "oobsize %d\n", mtd->oobsize);
2556 BUG();
2557 }
2558 }
2559
2560 if (!chip->write_page)
2561 chip->write_page = nand_write_page;
2562
2563 /*
2564 * check ECC mode, default to software if 3byte/512byte hardware ECC is
2565 * selected and we have 256 byte pagesize fallback to software ECC
2566 */
2567 if (!chip->ecc.read_page_raw)
2568 chip->ecc.read_page_raw = nand_read_page_raw;
2569 if (!chip->ecc.write_page_raw)
2570 chip->ecc.write_page_raw = nand_write_page_raw;
2571
2572 switch (chip->ecc.mode) {
2573 case NAND_ECC_HW:
2574 /* Use standard hwecc read page function ? */
2575 if (!chip->ecc.read_page)
2576 chip->ecc.read_page = nand_read_page_hwecc;
2577 if (!chip->ecc.write_page)
2578 chip->ecc.write_page = nand_write_page_hwecc;
2579 if (!chip->ecc.read_oob)
2580 chip->ecc.read_oob = nand_read_oob_std;
2581 if (!chip->ecc.write_oob)
2582 chip->ecc.write_oob = nand_write_oob_std;
2583
2584 case NAND_ECC_HW_SYNDROME:
2585 if ((!chip->ecc.calculate || !chip->ecc.correct ||
2586 !chip->ecc.hwctl) &&
2587 (!chip->ecc.read_page ||
2588 chip->ecc.read_page == nand_read_page_hwecc ||
2589 !chip->ecc.write_page ||
2590 chip->ecc.write_page == nand_write_page_hwecc)) {
2591 printk(KERN_WARNING "No ECC functions supplied, "
2592 "Hardware ECC not possible\n");
2593 BUG();
2594 }
2595 /* Use standard syndrome read/write page function ? */
2596 if (!chip->ecc.read_page)
2597 chip->ecc.read_page = nand_read_page_syndrome;
2598 if (!chip->ecc.write_page)
2599 chip->ecc.write_page = nand_write_page_syndrome;
2600 if (!chip->ecc.read_oob)
2601 chip->ecc.read_oob = nand_read_oob_syndrome;
2602 if (!chip->ecc.write_oob)
2603 chip->ecc.write_oob = nand_write_oob_syndrome;
2604
2605 if (mtd->writesize >= chip->ecc.size)
2606 break;
2607 printk(KERN_WARNING "%d byte HW ECC not possible on "
2608 "%d byte page size, fallback to SW ECC\n",
2609 chip->ecc.size, mtd->writesize);
2610 chip->ecc.mode = NAND_ECC_SOFT;
2611
2612 case NAND_ECC_SOFT:
2613 chip->ecc.calculate = nand_calculate_ecc;
2614 chip->ecc.correct = nand_correct_data;
2615 chip->ecc.read_page = nand_read_page_swecc;
2616 chip->ecc.read_subpage = nand_read_subpage;
2617 chip->ecc.write_page = nand_write_page_swecc;
2618 chip->ecc.read_oob = nand_read_oob_std;
2619 chip->ecc.write_oob = nand_write_oob_std;
2620 chip->ecc.size = 256;
2621 chip->ecc.bytes = 3;
2622 break;
2623
2624 case NAND_ECC_NONE:
2625 printk(KERN_WARNING "NAND_ECC_NONE selected by board driver. "
2626 "This is not recommended !!\n");
2627 chip->ecc.read_page = nand_read_page_raw;
2628 chip->ecc.write_page = nand_write_page_raw;
2629 chip->ecc.read_oob = nand_read_oob_std;
2630 chip->ecc.write_oob = nand_write_oob_std;
2631 chip->ecc.size = mtd->writesize;
2632 chip->ecc.bytes = 0;
2633 break;
2634
2635 default:
2636 printk(KERN_WARNING "Invalid NAND_ECC_MODE %d\n",
2637 chip->ecc.mode);
2638 BUG();
2639 }
2640
2641 /*
2642 * The number of bytes available for a client to place data into
2643 * the out of band area
2644 */
2645 chip->ecc.layout->oobavail = 0;
2646 for (i = 0; chip->ecc.layout->oobfree[i].length; i++)
2647 chip->ecc.layout->oobavail +=
2648 chip->ecc.layout->oobfree[i].length;
2649 mtd->oobavail = chip->ecc.layout->oobavail;
2650
2651 /*
2652 * Set the number of read / write steps for one page depending on ECC
2653 * mode
2654 */
2655 chip->ecc.steps = mtd->writesize / chip->ecc.size;
2656 if(chip->ecc.steps * chip->ecc.size != mtd->writesize) {
2657 printk(KERN_WARNING "Invalid ecc parameters\n");
2658 BUG();
2659 }
2660 chip->ecc.total = chip->ecc.steps * chip->ecc.bytes;
2661
2662 /*
2663 * Allow subpage writes up to ecc.steps. Not possible for MLC
2664 * FLASH.
2665 */
2666 if (!(chip->options & NAND_NO_SUBPAGE_WRITE) &&
2667 !(chip->cellinfo & NAND_CI_CELLTYPE_MSK)) {
2668 switch(chip->ecc.steps) {
2669 case 2:
2670 mtd->subpage_sft = 1;
2671 break;
2672 case 4:
2673 case 8:
2674 mtd->subpage_sft = 2;
2675 break;
2676 }
2677 }
2678 chip->subpagesize = mtd->writesize >> mtd->subpage_sft;
2679
2680 /* Initialize state */
2681 chip->state = FL_READY;
2682
2683 /* De-select the device */
2684 chip->select_chip(mtd, -1);
2685
2686 /* Invalidate the pagebuffer reference */
2687 chip->pagebuf = -1;
2688
2689 /* Fill in remaining MTD driver data */
2690 mtd->type = MTD_NANDFLASH;
2691 mtd->flags = MTD_CAP_NANDFLASH;
2692 mtd->erase = nand_erase;
2693 mtd->point = NULL;
2694 mtd->unpoint = NULL;
2695 mtd->read = nand_read;
2696 mtd->write = nand_write;
2697 mtd->read_oob = nand_read_oob;
2698 mtd->write_oob = nand_write_oob;
2699 mtd->sync = nand_sync;
2700 mtd->lock = NULL;
2701 mtd->unlock = NULL;
2702 mtd->suspend = nand_suspend;
2703 mtd->resume = nand_resume;
2704 mtd->block_isbad = nand_block_isbad;
2705 mtd->block_markbad = nand_block_markbad;
2706
2707 /* propagate ecc.layout to mtd_info */
2708 mtd->ecclayout = chip->ecc.layout;
2709
2710 /* Check, if we should skip the bad block table scan */
2711 if (chip->options & NAND_SKIP_BBTSCAN)
2712 return 0;
2713
2714 /* Build bad block table */
2715 return chip->scan_bbt(mtd);
2716 }
2717
2718 /* module_text_address() isn't exported, and it's mostly a pointless
2719 test if this is a module _anyway_ -- they'd have to try _really_ hard
2720 to call us from in-kernel code if the core NAND support is modular. */
2721 #ifdef MODULE
2722 #define caller_is_module() (1)
2723 #else
2724 #define caller_is_module() \
2725 module_text_address((unsigned long)__builtin_return_address(0))
2726 #endif
2727
2728 /**
2729 * nand_scan - [NAND Interface] Scan for the NAND device
2730 * @mtd: MTD device structure
2731 * @maxchips: Number of chips to scan for
2732 *
2733 * This fills out all the uninitialized function pointers
2734 * with the defaults.
2735 * The flash ID is read and the mtd/chip structures are
2736 * filled with the appropriate values.
2737 * The mtd->owner field must be set to the module of the caller
2738 *
2739 */
2740 int nand_scan(struct mtd_info *mtd, int maxchips)
2741 {
2742 int ret;
2743
2744 /* Many callers got this wrong, so check for it for a while... */
2745 if (!mtd->owner && caller_is_module()) {
2746 printk(KERN_CRIT "nand_scan() called with NULL mtd->owner!\n");
2747 BUG();
2748 }
2749
2750 ret = nand_scan_ident(mtd, maxchips);
2751 if (!ret)
2752 ret = nand_scan_tail(mtd);
2753 return ret;
2754 }
2755
2756 /**
2757 * nand_release - [NAND Interface] Free resources held by the NAND device
2758 * @mtd: MTD device structure
2759 */
2760 void nand_release(struct mtd_info *mtd)
2761 {
2762 struct nand_chip *chip = mtd->priv;
2763
2764 #ifdef CONFIG_MTD_PARTITIONS
2765 /* Deregister partitions */
2766 del_mtd_partitions(mtd);
2767 #endif
2768 /* Deregister the device */
2769 del_mtd_device(mtd);
2770
2771 /* Free bad block table memory */
2772 kfree(chip->bbt);
2773 if (!(chip->options & NAND_OWN_BUFFERS))
2774 kfree(chip->buffers);
2775 }
2776
2777 EXPORT_SYMBOL_GPL(nand_scan);
2778 EXPORT_SYMBOL_GPL(nand_scan_ident);
2779 EXPORT_SYMBOL_GPL(nand_scan_tail);
2780 EXPORT_SYMBOL_GPL(nand_release);
2781
2782 static int __init nand_base_init(void)
2783 {
2784 led_trigger_register_simple("nand-disk", &nand_led_trigger);
2785 return 0;
2786 }
2787
2788 static void __exit nand_base_exit(void)
2789 {
2790 led_trigger_unregister_simple(nand_led_trigger);
2791 }
2792
2793 module_init(nand_base_init);
2794 module_exit(nand_base_exit);
2795
2796 MODULE_LICENSE("GPL");
2797 MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com>, Thomas Gleixner <tglx@linutronix.de>");
2798 MODULE_DESCRIPTION("Generic NAND flash driver code");
Support for the Chinese Samsung S3C2440 based development boards