2 * Linux driver for Disk-On-Chip Millennium Plus
4 * (c) 2002-2003 Greg Ungerer <gerg@snapgear.com>
5 * (c) 2002-2003 SnapGear Inc
6 * (c) 1999 Machine Vision Holdings, Inc.
7 * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <asm/errno.h>
16 #include <asm/uaccess.h>
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/init.h>
20 #include <linux/types.h>
21 #include <linux/bitops.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/nand.h>
25 #include <linux/mtd/doc2000.h>
27 /* #define ECC_DEBUG */
29 /* I have no idea why some DoC chips can not use memcop_form|to_io().
30 * This may be due to the different revisions of the ASIC controller built-in or
31 * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment
35 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
36 size_t *retlen, u_char *buf);
37 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
38 size_t *retlen, const u_char *buf);
39 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
40 struct mtd_oob_ops *ops);
41 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
42 struct mtd_oob_ops *ops);
43 static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
45 static struct mtd_info *docmilpluslist = NULL;
48 /* Perform the required delay cycles by writing to the NOP register */
49 static void DoC_Delay(void __iomem * docptr, int cycles)
53 for (i = 0; (i < cycles); i++)
54 WriteDOC(0, docptr, Mplus_NOP);
57 #define CDSN_CTRL_FR_B_MASK (CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1)
59 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
60 static int _DoC_WaitReady(void __iomem * docptr)
62 unsigned int c = 0xffff;
64 DEBUG(MTD_DEBUG_LEVEL3,
65 "_DoC_WaitReady called for out-of-line wait\n");
67 /* Out-of-line routine to wait for chip response */
68 while (((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) && --c)
72 DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");
77 static inline int DoC_WaitReady(void __iomem * docptr)
79 /* This is inline, to optimise the common case, where it's ready instantly */
82 /* read form NOP register should be issued prior to the read from CDSNControl
83 see Software Requirement 11.4 item 2. */
86 if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK)
87 /* Call the out-of-line routine to wait */
88 ret = _DoC_WaitReady(docptr);
93 /* For some reason the Millennium Plus seems to occassionally put itself
94 * into reset mode. For me this happens randomly, with no pattern that I
95 * can detect. M-systems suggest always check this on any block level
96 * operation and setting to normal mode if in reset mode.
98 static inline void DoC_CheckASIC(void __iomem * docptr)
100 /* Make sure the DoC is in normal mode */
101 if ((ReadDOC(docptr, Mplus_DOCControl) & DOC_MODE_NORMAL) == 0) {
102 WriteDOC((DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_DOCControl);
103 WriteDOC(~(DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_CtrlConfirm);
107 /* DoC_Command: Send a flash command to the flash chip through the Flash
108 * command register. Need 2 Write Pipeline Terminates to complete send.
110 static void DoC_Command(void __iomem * docptr, unsigned char command,
111 unsigned char xtraflags)
113 WriteDOC(command, docptr, Mplus_FlashCmd);
114 WriteDOC(command, docptr, Mplus_WritePipeTerm);
115 WriteDOC(command, docptr, Mplus_WritePipeTerm);
118 /* DoC_Address: Set the current address for the flash chip through the Flash
119 * Address register. Need 2 Write Pipeline Terminates to complete send.
121 static inline void DoC_Address(struct DiskOnChip *doc, int numbytes,
122 unsigned long ofs, unsigned char xtraflags1,
123 unsigned char xtraflags2)
125 void __iomem * docptr = doc->virtadr;
127 /* Allow for possible Mill Plus internal flash interleaving */
128 ofs >>= doc->interleave;
132 /* Send single byte, bits 0-7. */
133 WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
136 /* Send bits 9-16 followed by 17-23 */
137 WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress);
138 WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
141 /* Send 0-7, 9-16, then 17-23 */
142 WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
143 WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress);
144 WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
150 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
151 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
154 /* DoC_SelectChip: Select a given flash chip within the current floor */
155 static int DoC_SelectChip(void __iomem * docptr, int chip)
157 /* No choice for flash chip on Millennium Plus */
161 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
162 static int DoC_SelectFloor(void __iomem * docptr, int floor)
164 WriteDOC((floor & 0x3), docptr, Mplus_DeviceSelect);
169 * Translate the given offset into the appropriate command and offset.
170 * This does the mapping using the 16bit interleave layout defined by
171 * M-Systems, and looks like this for a sector pair:
172 * +-----------+-------+-------+-------+--------------+---------+-----------+
173 * | 0 --- 511 |512-517|518-519|520-521| 522 --- 1033 |1034-1039|1040 - 1055|
174 * +-----------+-------+-------+-------+--------------+---------+-----------+
175 * | Data 0 | ECC 0 |Flags0 |Flags1 | Data 1 |ECC 1 | OOB 1 + 2 |
176 * +-----------+-------+-------+-------+--------------+---------+-----------+
178 /* FIXME: This lives in INFTL not here. Other users of flash devices
180 static unsigned int DoC_GetDataOffset(struct mtd_info *mtd, loff_t *from)
182 struct DiskOnChip *this = mtd->priv;
184 if (this->interleave) {
185 unsigned int ofs = *from & 0x3ff;
189 cmd = NAND_CMD_READ0;
191 } else if (ofs < 1014) {
192 cmd = NAND_CMD_READ1;
193 ofs = (ofs & 0x1ff) + 10;
195 cmd = NAND_CMD_READOOB;
199 *from = (*from & ~0x3ff) | ofs;
204 return NAND_CMD_READ1;
205 return NAND_CMD_READ0;
209 static unsigned int DoC_GetECCOffset(struct mtd_info *mtd, loff_t *from)
211 unsigned int ofs, cmd;
214 cmd = NAND_CMD_READOOB;
215 ofs = 10 + (*from & 0xf);
217 cmd = NAND_CMD_READ1;
221 *from = (*from & ~0x3ff) | ofs;
225 static unsigned int DoC_GetFlagsOffset(struct mtd_info *mtd, loff_t *from)
227 unsigned int ofs, cmd;
229 cmd = NAND_CMD_READ1;
230 ofs = (*from & 0x200) ? 8 : 6;
231 *from = (*from & ~0x3ff) | ofs;
235 static unsigned int DoC_GetHdrOffset(struct mtd_info *mtd, loff_t *from)
237 unsigned int ofs, cmd;
239 cmd = NAND_CMD_READOOB;
240 ofs = (*from & 0x200) ? 24 : 16;
241 *from = (*from & ~0x3ff) | ofs;
245 static inline void MemReadDOC(void __iomem * docptr, unsigned char *buf, int len)
249 for (i = 0; i < len; i++)
250 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
252 memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len);
256 static inline void MemWriteDOC(void __iomem * docptr, unsigned char *buf, int len)
260 for (i = 0; i < len; i++)
261 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
263 memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
267 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
268 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
272 void __iomem * docptr = doc->virtadr;
274 /* Page in the required floor/chip */
275 DoC_SelectFloor(docptr, floor);
276 DoC_SelectChip(docptr, chip);
278 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
279 WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
281 /* Reset the chip, see Software Requirement 11.4 item 1. */
282 DoC_Command(docptr, NAND_CMD_RESET, 0);
283 DoC_WaitReady(docptr);
285 /* Read the NAND chip ID: 1. Send ReadID command */
286 DoC_Command(docptr, NAND_CMD_READID, 0);
288 /* Read the NAND chip ID: 2. Send address byte zero */
289 DoC_Address(doc, 1, 0x00, 0, 0x00);
291 WriteDOC(0, docptr, Mplus_FlashControl);
292 DoC_WaitReady(docptr);
294 /* Read the manufacturer and device id codes of the flash device through
295 CDSN IO register see Software Requirement 11.4 item 5.*/
296 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
297 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
299 mfr = ReadDOC(docptr, Mil_CDSN_IO);
301 dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */
303 id = ReadDOC(docptr, Mil_CDSN_IO);
305 dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */
307 dummy = ReadDOC(docptr, Mplus_LastDataRead);
308 dummy = ReadDOC(docptr, Mplus_LastDataRead);
310 /* Disable flash internally */
311 WriteDOC(0, docptr, Mplus_FlashSelect);
313 /* No response - return failure */
314 if (mfr == 0xff || mfr == 0)
317 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
318 if (id == nand_flash_ids[i].id) {
319 /* Try to identify manufacturer */
320 for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
321 if (nand_manuf_ids[j].id == mfr)
324 printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
325 "Chip ID: %2.2X (%s:%s)\n", mfr, id,
326 nand_manuf_ids[j].name, nand_flash_ids[i].name);
329 doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
330 doc->erasesize = nand_flash_ids[i].erasesize << doc->interleave;
335 if (nand_flash_ids[i].name == NULL)
340 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
341 static void DoC_ScanChips(struct DiskOnChip *this)
344 int numchips[MAX_FLOORS_MPLUS];
351 /* Work out the intended interleave setting */
352 this->interleave = 0;
353 if (this->ChipID == DOC_ChipID_DocMilPlus32)
354 this->interleave = 1;
356 /* Check the ASIC agrees */
357 if ( (this->interleave << 2) !=
358 (ReadDOC(this->virtadr, Mplus_Configuration) & 4)) {
359 u_char conf = ReadDOC(this->virtadr, Mplus_Configuration);
360 printk(KERN_NOTICE "Setting DiskOnChip Millennium Plus interleave to %s\n",
361 this->interleave?"on (16-bit)":"off (8-bit)");
363 WriteDOC(conf, this->virtadr, Mplus_Configuration);
366 /* For each floor, find the number of valid chips it contains */
367 for (floor = 0,ret = 1; floor < MAX_FLOORS_MPLUS; floor++) {
369 for (chip = 0; chip < MAX_CHIPS_MPLUS && ret != 0; chip++) {
370 ret = DoC_IdentChip(this, floor, chip);
377 /* If there are none at all that we recognise, bail */
378 if (!this->numchips) {
379 printk("No flash chips recognised.\n");
383 /* Allocate an array to hold the information for each chip */
384 this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
386 printk("MTD: No memory for allocating chip info structures\n");
390 /* Fill out the chip array with {floor, chipno} for each
391 * detected chip in the device. */
392 for (floor = 0, ret = 0; floor < MAX_FLOORS_MPLUS; floor++) {
393 for (chip = 0 ; chip < numchips[floor] ; chip++) {
394 this->chips[ret].floor = floor;
395 this->chips[ret].chip = chip;
396 this->chips[ret].curadr = 0;
397 this->chips[ret].curmode = 0x50;
402 /* Calculate and print the total size of the device */
403 this->totlen = this->numchips * (1 << this->chipshift);
404 printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
405 this->numchips ,this->totlen >> 20);
408 static int DoCMilPlus_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
410 int tmp1, tmp2, retval;
412 if (doc1->physadr == doc2->physadr)
415 /* Use the alias resolution register which was set aside for this
416 * purpose. If it's value is the same on both chips, they might
417 * be the same chip, and we write to one and check for a change in
418 * the other. It's unclear if this register is usuable in the
419 * DoC 2000 (it's in the Millennium docs), but it seems to work. */
420 tmp1 = ReadDOC(doc1->virtadr, Mplus_AliasResolution);
421 tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
425 WriteDOC((tmp1+1) % 0xff, doc1->virtadr, Mplus_AliasResolution);
426 tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
427 if (tmp2 == (tmp1+1) % 0xff)
432 /* Restore register contents. May not be necessary, but do it just to
434 WriteDOC(tmp1, doc1->virtadr, Mplus_AliasResolution);
439 /* This routine is found from the docprobe code by symbol_get(),
440 * which will bump the use count of this module. */
441 void DoCMilPlus_init(struct mtd_info *mtd)
443 struct DiskOnChip *this = mtd->priv;
444 struct DiskOnChip *old = NULL;
446 /* We must avoid being called twice for the same device. */
448 old = docmilpluslist->priv;
451 if (DoCMilPlus_is_alias(this, old)) {
452 printk(KERN_NOTICE "Ignoring DiskOnChip Millennium "
453 "Plus at 0x%lX - already configured\n",
455 iounmap(this->virtadr);
460 old = old->nextdoc->priv;
465 mtd->name = "DiskOnChip Millennium Plus";
466 printk(KERN_NOTICE "DiskOnChip Millennium Plus found at "
467 "address 0x%lX\n", this->physadr);
469 mtd->type = MTD_NANDFLASH;
470 mtd->flags = MTD_CAP_NANDFLASH;
474 mtd->writesize = 512;
476 mtd->owner = THIS_MODULE;
477 mtd->erase = doc_erase;
480 mtd->read = doc_read;
481 mtd->write = doc_write;
482 mtd->read_oob = doc_read_oob;
483 mtd->write_oob = doc_write_oob;
491 /* Ident all the chips present. */
496 iounmap(this->virtadr);
498 this->nextdoc = docmilpluslist;
499 docmilpluslist = mtd;
500 mtd->size = this->totlen;
501 mtd->erasesize = this->erasesize;
506 EXPORT_SYMBOL_GPL(DoCMilPlus_init);
509 static int doc_dumpblk(struct mtd_info *mtd, loff_t from)
513 struct DiskOnChip *this = mtd->priv;
514 void __iomem * docptr = this->virtadr;
515 struct Nand *mychip = &this->chips[from >> (this->chipshift)];
516 unsigned char *bp, buf[1056];
521 /* Don't allow read past end of device */
522 if (from >= this->totlen)
525 DoC_CheckASIC(docptr);
527 /* Find the chip which is to be used and select it */
528 if (this->curfloor != mychip->floor) {
529 DoC_SelectFloor(docptr, mychip->floor);
530 DoC_SelectChip(docptr, mychip->chip);
531 } else if (this->curchip != mychip->chip) {
532 DoC_SelectChip(docptr, mychip->chip);
534 this->curfloor = mychip->floor;
535 this->curchip = mychip->chip;
537 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
538 WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
540 /* Reset the chip, see Software Requirement 11.4 item 1. */
541 DoC_Command(docptr, NAND_CMD_RESET, 0);
542 DoC_WaitReady(docptr);
545 DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
546 DoC_Address(this, 3, fofs, 0, 0x00);
547 WriteDOC(0, docptr, Mplus_FlashControl);
548 DoC_WaitReady(docptr);
550 /* disable the ECC engine */
551 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
553 ReadDOC(docptr, Mplus_ReadPipeInit);
554 ReadDOC(docptr, Mplus_ReadPipeInit);
556 /* Read the data via the internal pipeline through CDSN IO
557 register, see Pipelined Read Operations 11.3 */
558 MemReadDOC(docptr, buf, 1054);
559 buf[1054] = ReadDOC(docptr, Mplus_LastDataRead);
560 buf[1055] = ReadDOC(docptr, Mplus_LastDataRead);
562 memset(&c[0], 0, sizeof(c));
563 printk("DUMP OFFSET=%x:\n", (int)from);
565 for (i = 0, bp = &buf[0]; (i < 1056); i++) {
568 printk(" %02x", *bp);
569 c[(i & 0xf)] = ((*bp >= 0x20) && (*bp <= 0x7f)) ? *bp : '.';
571 if (((i + 1) % 16) == 0)
576 /* Disable flash internally */
577 WriteDOC(0, docptr, Mplus_FlashSelect);
583 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
584 size_t *retlen, u_char *buf)
589 unsigned char syndrome[6], eccbuf[6];
590 struct DiskOnChip *this = mtd->priv;
591 void __iomem * docptr = this->virtadr;
592 struct Nand *mychip = &this->chips[from >> (this->chipshift)];
594 /* Don't allow read past end of device */
595 if (from >= this->totlen)
598 /* Don't allow a single read to cross a 512-byte block boundary */
599 if (from + len > ((from | 0x1ff) + 1))
600 len = ((from | 0x1ff) + 1) - from;
602 DoC_CheckASIC(docptr);
604 /* Find the chip which is to be used and select it */
605 if (this->curfloor != mychip->floor) {
606 DoC_SelectFloor(docptr, mychip->floor);
607 DoC_SelectChip(docptr, mychip->chip);
608 } else if (this->curchip != mychip->chip) {
609 DoC_SelectChip(docptr, mychip->chip);
611 this->curfloor = mychip->floor;
612 this->curchip = mychip->chip;
614 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
615 WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
617 /* Reset the chip, see Software Requirement 11.4 item 1. */
618 DoC_Command(docptr, NAND_CMD_RESET, 0);
619 DoC_WaitReady(docptr);
622 DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
623 DoC_Address(this, 3, fofs, 0, 0x00);
624 WriteDOC(0, docptr, Mplus_FlashControl);
625 DoC_WaitReady(docptr);
627 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
628 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
629 WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);
631 /* Let the caller know we completed it */
635 ReadDOC(docptr, Mplus_ReadPipeInit);
636 ReadDOC(docptr, Mplus_ReadPipeInit);
638 /* Read the data via the internal pipeline through CDSN IO
639 register, see Pipelined Read Operations 11.3 */
640 MemReadDOC(docptr, buf, len);
642 /* Read the ECC data following raw data */
643 MemReadDOC(docptr, eccbuf, 4);
644 eccbuf[4] = ReadDOC(docptr, Mplus_LastDataRead);
645 eccbuf[5] = ReadDOC(docptr, Mplus_LastDataRead);
647 /* Flush the pipeline */
648 dummy = ReadDOC(docptr, Mplus_ECCConf);
649 dummy = ReadDOC(docptr, Mplus_ECCConf);
651 /* Check the ECC Status */
652 if (ReadDOC(docptr, Mplus_ECCConf) & 0x80) {
654 /* There was an ECC error */
656 printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
658 /* Read the ECC syndrom through the DiskOnChip ECC logic.
659 These syndrome will be all ZERO when there is no error */
660 for (i = 0; i < 6; i++)
661 syndrome[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);
663 nb_errors = doc_decode_ecc(buf, syndrome);
665 printk("ECC Errors corrected: %x\n", nb_errors);
668 /* We return error, but have actually done the
669 read. Not that this can be told to user-space, via
670 sys_read(), but at least MTD-aware stuff can know
671 about it by checking *retlen */
673 printk("%s(%d): Millennium Plus ECC error (from=0x%x:\n",
674 __FILE__, __LINE__, (int)from);
675 printk(" syndrome= %02x:%02x:%02x:%02x:%02x:"
677 syndrome[0], syndrome[1], syndrome[2],
678 syndrome[3], syndrome[4], syndrome[5]);
679 printk(" eccbuf= %02x:%02x:%02x:%02x:%02x:"
681 eccbuf[0], eccbuf[1], eccbuf[2],
682 eccbuf[3], eccbuf[4], eccbuf[5]);
689 printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
690 (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
691 eccbuf[4], eccbuf[5]);
693 /* disable the ECC engine */
694 WriteDOC(DOC_ECC_DIS, docptr , Mplus_ECCConf);
696 /* Disable flash internally */
697 WriteDOC(0, docptr, Mplus_FlashSelect);
702 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
703 size_t *retlen, const u_char *buf)
705 int i, before, ret = 0;
709 struct DiskOnChip *this = mtd->priv;
710 void __iomem * docptr = this->virtadr;
711 struct Nand *mychip = &this->chips[to >> (this->chipshift)];
713 /* Don't allow write past end of device */
714 if (to >= this->totlen)
717 /* Don't allow writes which aren't exactly one block (512 bytes) */
718 if ((to & 0x1ff) || (len != 0x200))
721 /* Determine position of OOB flags, before or after data */
722 before = (this->interleave && (to & 0x200));
724 DoC_CheckASIC(docptr);
726 /* Find the chip which is to be used and select it */
727 if (this->curfloor != mychip->floor) {
728 DoC_SelectFloor(docptr, mychip->floor);
729 DoC_SelectChip(docptr, mychip->chip);
730 } else if (this->curchip != mychip->chip) {
731 DoC_SelectChip(docptr, mychip->chip);
733 this->curfloor = mychip->floor;
734 this->curchip = mychip->chip;
736 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
737 WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
739 /* Reset the chip, see Software Requirement 11.4 item 1. */
740 DoC_Command(docptr, NAND_CMD_RESET, 0);
741 DoC_WaitReady(docptr);
743 /* Set device to appropriate plane of flash */
745 WriteDOC(DoC_GetDataOffset(mtd, &fto), docptr, Mplus_FlashCmd);
747 /* On interleaved devices the flags for 2nd half 512 are before data */
751 /* issue the Serial Data In command to initial the Page Program process */
752 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
753 DoC_Address(this, 3, fto, 0x00, 0x00);
755 /* Disable the ECC engine */
756 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
759 /* Write the block status BLOCK_USED (0x5555) */
760 WriteDOC(0x55, docptr, Mil_CDSN_IO);
761 WriteDOC(0x55, docptr, Mil_CDSN_IO);
764 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
765 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf);
767 MemWriteDOC(docptr, (unsigned char *) buf, len);
769 /* Write ECC data to flash, the ECC info is generated by
770 the DiskOnChip ECC logic see Reed-Solomon EDC/ECC 11.1 */
771 DoC_Delay(docptr, 3);
773 /* Read the ECC data through the DiskOnChip ECC logic */
774 for (i = 0; i < 6; i++)
775 eccbuf[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);
777 /* disable the ECC engine */
778 WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
780 /* Write the ECC data to flash */
781 MemWriteDOC(docptr, eccbuf, 6);
784 /* Write the block status BLOCK_USED (0x5555) */
785 WriteDOC(0x55, docptr, Mil_CDSN_IO+6);
786 WriteDOC(0x55, docptr, Mil_CDSN_IO+7);
790 printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
791 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
792 eccbuf[4], eccbuf[5]);
795 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
796 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
798 /* Commit the Page Program command and wait for ready
799 see Software Requirement 11.4 item 1.*/
800 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
801 DoC_WaitReady(docptr);
803 /* Read the status of the flash device through CDSN IO register
804 see Software Requirement 11.4 item 5.*/
805 DoC_Command(docptr, NAND_CMD_STATUS, 0);
806 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
807 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
808 DoC_Delay(docptr, 2);
809 if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
810 printk("MTD: Error 0x%x programming at 0x%x\n", dummy, (int)to);
811 /* Error in programming
812 FIXME: implement Bad Block Replacement (in nftl.c ??) */
816 dummy = ReadDOC(docptr, Mplus_LastDataRead);
818 /* Disable flash internally */
819 WriteDOC(0, docptr, Mplus_FlashSelect);
821 /* Let the caller know we completed it */
827 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
828 struct mtd_oob_ops *ops)
831 struct DiskOnChip *this = mtd->priv;
832 void __iomem * docptr = this->virtadr;
833 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
834 size_t i, size, got, want;
835 uint8_t *buf = ops->oobbuf;
836 size_t len = ops->len;
838 BUG_ON(ops->mode != MTD_OOB_PLACE);
842 DoC_CheckASIC(docptr);
844 /* Find the chip which is to be used and select it */
845 if (this->curfloor != mychip->floor) {
846 DoC_SelectFloor(docptr, mychip->floor);
847 DoC_SelectChip(docptr, mychip->chip);
848 } else if (this->curchip != mychip->chip) {
849 DoC_SelectChip(docptr, mychip->chip);
851 this->curfloor = mychip->floor;
852 this->curchip = mychip->chip;
854 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
855 WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
857 /* disable the ECC engine */
858 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
859 DoC_WaitReady(docptr);
861 /* Maximum of 16 bytes in the OOB region, so limit read to that */
867 for (i = 0; ((i < 3) && (want > 0)); i++) {
868 /* Figure out which region we are accessing... */
871 if (!this->interleave) {
872 DoC_Command(docptr, NAND_CMD_READOOB, 0);
874 } else if (base < 6) {
875 DoC_Command(docptr, DoC_GetECCOffset(mtd, &fofs), 0);
877 } else if (base < 8) {
878 DoC_Command(docptr, DoC_GetFlagsOffset(mtd, &fofs), 0);
881 DoC_Command(docptr, DoC_GetHdrOffset(mtd, &fofs), 0);
887 /* Issue read command */
888 DoC_Address(this, 3, fofs, 0, 0x00);
889 WriteDOC(0, docptr, Mplus_FlashControl);
890 DoC_WaitReady(docptr);
892 ReadDOC(docptr, Mplus_ReadPipeInit);
893 ReadDOC(docptr, Mplus_ReadPipeInit);
894 MemReadDOC(docptr, &buf[got], size - 2);
895 buf[got + size - 2] = ReadDOC(docptr, Mplus_LastDataRead);
896 buf[got + size - 1] = ReadDOC(docptr, Mplus_LastDataRead);
903 /* Disable flash internally */
904 WriteDOC(0, docptr, Mplus_FlashSelect);
910 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
911 struct mtd_oob_ops *ops)
915 struct DiskOnChip *this = mtd->priv;
916 void __iomem * docptr = this->virtadr;
917 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
918 size_t i, size, got, want;
920 uint8_t *buf = ops->oobbuf;
921 size_t len = ops->len;
923 BUG_ON(ops->mode != MTD_OOB_PLACE);
927 DoC_CheckASIC(docptr);
929 /* Find the chip which is to be used and select it */
930 if (this->curfloor != mychip->floor) {
931 DoC_SelectFloor(docptr, mychip->floor);
932 DoC_SelectChip(docptr, mychip->chip);
933 } else if (this->curchip != mychip->chip) {
934 DoC_SelectChip(docptr, mychip->chip);
936 this->curfloor = mychip->floor;
937 this->curchip = mychip->chip;
939 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
940 WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
943 /* Maximum of 16 bytes in the OOB region, so limit write to that */
949 for (i = 0; ((i < 3) && (want > 0)); i++) {
950 /* Reset the chip, see Software Requirement 11.4 item 1. */
951 DoC_Command(docptr, NAND_CMD_RESET, 0);
952 DoC_WaitReady(docptr);
954 /* Figure out which region we are accessing... */
957 if (!this->interleave) {
958 WriteDOC(NAND_CMD_READOOB, docptr, Mplus_FlashCmd);
960 } else if (base < 6) {
961 WriteDOC(DoC_GetECCOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
963 } else if (base < 8) {
964 WriteDOC(DoC_GetFlagsOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
967 WriteDOC(DoC_GetHdrOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
973 /* Issue the Serial Data In command to initial the Page Program process */
974 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
975 DoC_Address(this, 3, fofs, 0, 0x00);
977 /* Disable the ECC engine */
978 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
980 /* Write the data via the internal pipeline through CDSN IO
981 register, see Pipelined Write Operations 11.2 */
982 MemWriteDOC(docptr, (unsigned char *) &buf[got], size);
983 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
984 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
986 /* Commit the Page Program command and wait for ready
987 see Software Requirement 11.4 item 1.*/
988 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
989 DoC_WaitReady(docptr);
991 /* Read the status of the flash device through CDSN IO register
992 see Software Requirement 11.4 item 5.*/
993 DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
994 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
995 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
996 DoC_Delay(docptr, 2);
997 if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
998 printk("MTD: Error 0x%x programming oob at 0x%x\n",
1000 /* FIXME: implement Bad Block Replacement */
1004 dummy = ReadDOC(docptr, Mplus_LastDataRead);
1011 /* Disable flash internally */
1012 WriteDOC(0, docptr, Mplus_FlashSelect);
1018 int doc_erase(struct mtd_info *mtd, struct erase_info *instr)
1020 volatile char dummy;
1021 struct DiskOnChip *this = mtd->priv;
1022 __u32 ofs = instr->addr;
1023 __u32 len = instr->len;
1024 void __iomem * docptr = this->virtadr;
1025 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
1027 DoC_CheckASIC(docptr);
1029 if (len != mtd->erasesize)
1030 printk(KERN_WARNING "MTD: Erase not right size (%x != %x)n",
1031 len, mtd->erasesize);
1033 /* Find the chip which is to be used and select it */
1034 if (this->curfloor != mychip->floor) {
1035 DoC_SelectFloor(docptr, mychip->floor);
1036 DoC_SelectChip(docptr, mychip->chip);
1037 } else if (this->curchip != mychip->chip) {
1038 DoC_SelectChip(docptr, mychip->chip);
1040 this->curfloor = mychip->floor;
1041 this->curchip = mychip->chip;
1043 instr->state = MTD_ERASE_PENDING;
1045 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
1046 WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
1048 DoC_Command(docptr, NAND_CMD_RESET, 0x00);
1049 DoC_WaitReady(docptr);
1051 DoC_Command(docptr, NAND_CMD_ERASE1, 0);
1052 DoC_Address(this, 2, ofs, 0, 0x00);
1053 DoC_Command(docptr, NAND_CMD_ERASE2, 0);
1054 DoC_WaitReady(docptr);
1055 instr->state = MTD_ERASING;
1057 /* Read the status of the flash device through CDSN IO register
1058 see Software Requirement 11.4 item 5. */
1059 DoC_Command(docptr, NAND_CMD_STATUS, 0);
1060 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
1061 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
1062 if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
1063 printk("MTD: Error 0x%x erasing at 0x%x\n", dummy, ofs);
1064 /* FIXME: implement Bad Block Replacement (in nftl.c ??) */
1065 instr->state = MTD_ERASE_FAILED;
1067 instr->state = MTD_ERASE_DONE;
1069 dummy = ReadDOC(docptr, Mplus_LastDataRead);
1071 /* Disable flash internally */
1072 WriteDOC(0, docptr, Mplus_FlashSelect);
1074 mtd_erase_callback(instr);
1079 /****************************************************************************
1083 ****************************************************************************/
1085 static void __exit cleanup_doc2001plus(void)
1087 struct mtd_info *mtd;
1088 struct DiskOnChip *this;
1090 while ((mtd=docmilpluslist)) {
1092 docmilpluslist = this->nextdoc;
1094 del_mtd_device(mtd);
1096 iounmap(this->virtadr);
1102 module_exit(cleanup_doc2001plus);
1104 MODULE_LICENSE("GPL");
1105 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com> et al.");
1106 MODULE_DESCRIPTION("Driver for DiskOnChip Millennium Plus");