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/miscdevice.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/types.h>
22 #include <linux/bitops.h>
24 #include <linux/mtd/mtd.h>
25 #include <linux/mtd/nand.h>
26 #include <linux/mtd/doc2000.h>
28 /* #define ECC_DEBUG */
30 /* I have no idea why some DoC chips can not use memcop_form|to_io().
31 * This may be due to the different revisions of the ASIC controller built-in or
32 * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment
36 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
37 size_t *retlen, u_char *buf);
38 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
39 size_t *retlen, const u_char *buf);
40 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
41 struct mtd_oob_ops *ops);
42 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
43 struct mtd_oob_ops *ops);
44 static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
46 static struct mtd_info *docmilpluslist = NULL;
49 /* Perform the required delay cycles by writing to the NOP register */
50 static void DoC_Delay(void __iomem * docptr, int cycles)
54 for (i = 0; (i < cycles); i++)
55 WriteDOC(0, docptr, Mplus_NOP);
58 #define CDSN_CTRL_FR_B_MASK (CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1)
60 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
61 static int _DoC_WaitReady(void __iomem * docptr)
63 unsigned int c = 0xffff;
65 DEBUG(MTD_DEBUG_LEVEL3,
66 "_DoC_WaitReady called for out-of-line wait\n");
68 /* Out-of-line routine to wait for chip response */
69 while (((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) && --c)
73 DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");
78 static inline int DoC_WaitReady(void __iomem * docptr)
80 /* This is inline, to optimise the common case, where it's ready instantly */
83 /* read form NOP register should be issued prior to the read from CDSNControl
84 see Software Requirement 11.4 item 2. */
87 if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK)
88 /* Call the out-of-line routine to wait */
89 ret = _DoC_WaitReady(docptr);
94 /* For some reason the Millennium Plus seems to occassionally put itself
95 * into reset mode. For me this happens randomly, with no pattern that I
96 * can detect. M-systems suggest always check this on any block level
97 * operation and setting to normal mode if in reset mode.
99 static inline void DoC_CheckASIC(void __iomem * docptr)
101 /* Make sure the DoC is in normal mode */
102 if ((ReadDOC(docptr, Mplus_DOCControl) & DOC_MODE_NORMAL) == 0) {
103 WriteDOC((DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_DOCControl);
104 WriteDOC(~(DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_CtrlConfirm);
108 /* DoC_Command: Send a flash command to the flash chip through the Flash
109 * command register. Need 2 Write Pipeline Terminates to complete send.
111 static void DoC_Command(void __iomem * docptr, unsigned char command,
112 unsigned char xtraflags)
114 WriteDOC(command, docptr, Mplus_FlashCmd);
115 WriteDOC(command, docptr, Mplus_WritePipeTerm);
116 WriteDOC(command, docptr, Mplus_WritePipeTerm);
119 /* DoC_Address: Set the current address for the flash chip through the Flash
120 * Address register. Need 2 Write Pipeline Terminates to complete send.
122 static inline void DoC_Address(struct DiskOnChip *doc, int numbytes,
123 unsigned long ofs, unsigned char xtraflags1,
124 unsigned char xtraflags2)
126 void __iomem * docptr = doc->virtadr;
128 /* Allow for possible Mill Plus internal flash interleaving */
129 ofs >>= doc->interleave;
133 /* Send single byte, bits 0-7. */
134 WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
137 /* Send bits 9-16 followed by 17-23 */
138 WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress);
139 WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
142 /* Send 0-7, 9-16, then 17-23 */
143 WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
144 WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress);
145 WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
151 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
152 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
155 /* DoC_SelectChip: Select a given flash chip within the current floor */
156 static int DoC_SelectChip(void __iomem * docptr, int chip)
158 /* No choice for flash chip on Millennium Plus */
162 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
163 static int DoC_SelectFloor(void __iomem * docptr, int floor)
165 WriteDOC((floor & 0x3), docptr, Mplus_DeviceSelect);
170 * Translate the given offset into the appropriate command and offset.
171 * This does the mapping using the 16bit interleave layout defined by
172 * M-Systems, and looks like this for a sector pair:
173 * +-----------+-------+-------+-------+--------------+---------+-----------+
174 * | 0 --- 511 |512-517|518-519|520-521| 522 --- 1033 |1034-1039|1040 - 1055|
175 * +-----------+-------+-------+-------+--------------+---------+-----------+
176 * | Data 0 | ECC 0 |Flags0 |Flags1 | Data 1 |ECC 1 | OOB 1 + 2 |
177 * +-----------+-------+-------+-------+--------------+---------+-----------+
179 /* FIXME: This lives in INFTL not here. Other users of flash devices
181 static unsigned int DoC_GetDataOffset(struct mtd_info *mtd, loff_t *from)
183 struct DiskOnChip *this = mtd->priv;
185 if (this->interleave) {
186 unsigned int ofs = *from & 0x3ff;
190 cmd = NAND_CMD_READ0;
192 } else if (ofs < 1014) {
193 cmd = NAND_CMD_READ1;
194 ofs = (ofs & 0x1ff) + 10;
196 cmd = NAND_CMD_READOOB;
200 *from = (*from & ~0x3ff) | ofs;
205 return NAND_CMD_READ1;
206 return NAND_CMD_READ0;
210 static unsigned int DoC_GetECCOffset(struct mtd_info *mtd, loff_t *from)
212 unsigned int ofs, cmd;
215 cmd = NAND_CMD_READOOB;
216 ofs = 10 + (*from & 0xf);
218 cmd = NAND_CMD_READ1;
222 *from = (*from & ~0x3ff) | ofs;
226 static unsigned int DoC_GetFlagsOffset(struct mtd_info *mtd, loff_t *from)
228 unsigned int ofs, cmd;
230 cmd = NAND_CMD_READ1;
231 ofs = (*from & 0x200) ? 8 : 6;
232 *from = (*from & ~0x3ff) | ofs;
236 static unsigned int DoC_GetHdrOffset(struct mtd_info *mtd, loff_t *from)
238 unsigned int ofs, cmd;
240 cmd = NAND_CMD_READOOB;
241 ofs = (*from & 0x200) ? 24 : 16;
242 *from = (*from & ~0x3ff) | ofs;
246 static inline void MemReadDOC(void __iomem * docptr, unsigned char *buf, int len)
250 for (i = 0; i < len; i++)
251 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
253 memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len);
257 static inline void MemWriteDOC(void __iomem * docptr, unsigned char *buf, int len)
261 for (i = 0; i < len; i++)
262 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
264 memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
268 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
269 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
273 void __iomem * docptr = doc->virtadr;
275 /* Page in the required floor/chip */
276 DoC_SelectFloor(docptr, floor);
277 DoC_SelectChip(docptr, chip);
279 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
280 WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
282 /* Reset the chip, see Software Requirement 11.4 item 1. */
283 DoC_Command(docptr, NAND_CMD_RESET, 0);
284 DoC_WaitReady(docptr);
286 /* Read the NAND chip ID: 1. Send ReadID command */
287 DoC_Command(docptr, NAND_CMD_READID, 0);
289 /* Read the NAND chip ID: 2. Send address byte zero */
290 DoC_Address(doc, 1, 0x00, 0, 0x00);
292 WriteDOC(0, docptr, Mplus_FlashControl);
293 DoC_WaitReady(docptr);
295 /* Read the manufacturer and device id codes of the flash device through
296 CDSN IO register see Software Requirement 11.4 item 5.*/
297 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
298 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
300 mfr = ReadDOC(docptr, Mil_CDSN_IO);
302 dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */
304 id = ReadDOC(docptr, Mil_CDSN_IO);
306 dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */
308 dummy = ReadDOC(docptr, Mplus_LastDataRead);
309 dummy = ReadDOC(docptr, Mplus_LastDataRead);
311 /* Disable flash internally */
312 WriteDOC(0, docptr, Mplus_FlashSelect);
314 /* No response - return failure */
315 if (mfr == 0xff || mfr == 0)
318 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
319 if (id == nand_flash_ids[i].id) {
320 /* Try to identify manufacturer */
321 for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
322 if (nand_manuf_ids[j].id == mfr)
325 printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
326 "Chip ID: %2.2X (%s:%s)\n", mfr, id,
327 nand_manuf_ids[j].name, nand_flash_ids[i].name);
330 doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
331 doc->erasesize = nand_flash_ids[i].erasesize << doc->interleave;
336 if (nand_flash_ids[i].name == NULL)
341 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
342 static void DoC_ScanChips(struct DiskOnChip *this)
345 int numchips[MAX_FLOORS_MPLUS];
352 /* Work out the intended interleave setting */
353 this->interleave = 0;
354 if (this->ChipID == DOC_ChipID_DocMilPlus32)
355 this->interleave = 1;
357 /* Check the ASIC agrees */
358 if ( (this->interleave << 2) !=
359 (ReadDOC(this->virtadr, Mplus_Configuration) & 4)) {
360 u_char conf = ReadDOC(this->virtadr, Mplus_Configuration);
361 printk(KERN_NOTICE "Setting DiskOnChip Millennium Plus interleave to %s\n",
362 this->interleave?"on (16-bit)":"off (8-bit)");
364 WriteDOC(conf, this->virtadr, Mplus_Configuration);
367 /* For each floor, find the number of valid chips it contains */
368 for (floor = 0,ret = 1; floor < MAX_FLOORS_MPLUS; floor++) {
370 for (chip = 0; chip < MAX_CHIPS_MPLUS && ret != 0; chip++) {
371 ret = DoC_IdentChip(this, floor, chip);
378 /* If there are none at all that we recognise, bail */
379 if (!this->numchips) {
380 printk("No flash chips recognised.\n");
384 /* Allocate an array to hold the information for each chip */
385 this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
387 printk("MTD: No memory for allocating chip info structures\n");
391 /* Fill out the chip array with {floor, chipno} for each
392 * detected chip in the device. */
393 for (floor = 0, ret = 0; floor < MAX_FLOORS_MPLUS; floor++) {
394 for (chip = 0 ; chip < numchips[floor] ; chip++) {
395 this->chips[ret].floor = floor;
396 this->chips[ret].chip = chip;
397 this->chips[ret].curadr = 0;
398 this->chips[ret].curmode = 0x50;
403 /* Calculate and print the total size of the device */
404 this->totlen = this->numchips * (1 << this->chipshift);
405 printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
406 this->numchips ,this->totlen >> 20);
409 static int DoCMilPlus_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
411 int tmp1, tmp2, retval;
413 if (doc1->physadr == doc2->physadr)
416 /* Use the alias resolution register which was set aside for this
417 * purpose. If it's value is the same on both chips, they might
418 * be the same chip, and we write to one and check for a change in
419 * the other. It's unclear if this register is usuable in the
420 * DoC 2000 (it's in the Millennium docs), but it seems to work. */
421 tmp1 = ReadDOC(doc1->virtadr, Mplus_AliasResolution);
422 tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
426 WriteDOC((tmp1+1) % 0xff, doc1->virtadr, Mplus_AliasResolution);
427 tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
428 if (tmp2 == (tmp1+1) % 0xff)
433 /* Restore register contents. May not be necessary, but do it just to
435 WriteDOC(tmp1, doc1->virtadr, Mplus_AliasResolution);
440 /* This routine is found from the docprobe code by symbol_get(),
441 * which will bump the use count of this module. */
442 void DoCMilPlus_init(struct mtd_info *mtd)
444 struct DiskOnChip *this = mtd->priv;
445 struct DiskOnChip *old = NULL;
447 /* We must avoid being called twice for the same device. */
449 old = docmilpluslist->priv;
452 if (DoCMilPlus_is_alias(this, old)) {
453 printk(KERN_NOTICE "Ignoring DiskOnChip Millennium "
454 "Plus at 0x%lX - already configured\n",
456 iounmap(this->virtadr);
461 old = old->nextdoc->priv;
466 mtd->name = "DiskOnChip Millennium Plus";
467 printk(KERN_NOTICE "DiskOnChip Millennium Plus found at "
468 "address 0x%lX\n", this->physadr);
470 mtd->type = MTD_NANDFLASH;
471 mtd->flags = MTD_CAP_NANDFLASH;
475 mtd->writesize = 512;
477 mtd->owner = THIS_MODULE;
478 mtd->erase = doc_erase;
481 mtd->read = doc_read;
482 mtd->write = doc_write;
483 mtd->read_oob = doc_read_oob;
484 mtd->write_oob = doc_write_oob;
492 /* Ident all the chips present. */
497 iounmap(this->virtadr);
499 this->nextdoc = docmilpluslist;
500 docmilpluslist = mtd;
501 mtd->size = this->totlen;
502 mtd->erasesize = this->erasesize;
507 EXPORT_SYMBOL_GPL(DoCMilPlus_init);
510 static int doc_dumpblk(struct mtd_info *mtd, loff_t from)
514 struct DiskOnChip *this = mtd->priv;
515 void __iomem * docptr = this->virtadr;
516 struct Nand *mychip = &this->chips[from >> (this->chipshift)];
517 unsigned char *bp, buf[1056];
522 /* Don't allow read past end of device */
523 if (from >= this->totlen)
526 DoC_CheckASIC(docptr);
528 /* Find the chip which is to be used and select it */
529 if (this->curfloor != mychip->floor) {
530 DoC_SelectFloor(docptr, mychip->floor);
531 DoC_SelectChip(docptr, mychip->chip);
532 } else if (this->curchip != mychip->chip) {
533 DoC_SelectChip(docptr, mychip->chip);
535 this->curfloor = mychip->floor;
536 this->curchip = mychip->chip;
538 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
539 WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
541 /* Reset the chip, see Software Requirement 11.4 item 1. */
542 DoC_Command(docptr, NAND_CMD_RESET, 0);
543 DoC_WaitReady(docptr);
546 DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
547 DoC_Address(this, 3, fofs, 0, 0x00);
548 WriteDOC(0, docptr, Mplus_FlashControl);
549 DoC_WaitReady(docptr);
551 /* disable the ECC engine */
552 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
554 ReadDOC(docptr, Mplus_ReadPipeInit);
555 ReadDOC(docptr, Mplus_ReadPipeInit);
557 /* Read the data via the internal pipeline through CDSN IO
558 register, see Pipelined Read Operations 11.3 */
559 MemReadDOC(docptr, buf, 1054);
560 buf[1054] = ReadDOC(docptr, Mplus_LastDataRead);
561 buf[1055] = ReadDOC(docptr, Mplus_LastDataRead);
563 memset(&c[0], 0, sizeof(c));
564 printk("DUMP OFFSET=%x:\n", (int)from);
566 for (i = 0, bp = &buf[0]; (i < 1056); i++) {
569 printk(" %02x", *bp);
570 c[(i & 0xf)] = ((*bp >= 0x20) && (*bp <= 0x7f)) ? *bp : '.';
572 if (((i + 1) % 16) == 0)
577 /* Disable flash internally */
578 WriteDOC(0, docptr, Mplus_FlashSelect);
584 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
585 size_t *retlen, u_char *buf)
590 unsigned char syndrome[6], eccbuf[6];
591 struct DiskOnChip *this = mtd->priv;
592 void __iomem * docptr = this->virtadr;
593 struct Nand *mychip = &this->chips[from >> (this->chipshift)];
595 /* Don't allow read past end of device */
596 if (from >= this->totlen)
599 /* Don't allow a single read to cross a 512-byte block boundary */
600 if (from + len > ((from | 0x1ff) + 1))
601 len = ((from | 0x1ff) + 1) - from;
603 DoC_CheckASIC(docptr);
605 /* Find the chip which is to be used and select it */
606 if (this->curfloor != mychip->floor) {
607 DoC_SelectFloor(docptr, mychip->floor);
608 DoC_SelectChip(docptr, mychip->chip);
609 } else if (this->curchip != mychip->chip) {
610 DoC_SelectChip(docptr, mychip->chip);
612 this->curfloor = mychip->floor;
613 this->curchip = mychip->chip;
615 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
616 WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
618 /* Reset the chip, see Software Requirement 11.4 item 1. */
619 DoC_Command(docptr, NAND_CMD_RESET, 0);
620 DoC_WaitReady(docptr);
623 DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
624 DoC_Address(this, 3, fofs, 0, 0x00);
625 WriteDOC(0, docptr, Mplus_FlashControl);
626 DoC_WaitReady(docptr);
628 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
629 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
630 WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);
632 /* Let the caller know we completed it */
636 ReadDOC(docptr, Mplus_ReadPipeInit);
637 ReadDOC(docptr, Mplus_ReadPipeInit);
639 /* Read the data via the internal pipeline through CDSN IO
640 register, see Pipelined Read Operations 11.3 */
641 MemReadDOC(docptr, buf, len);
643 /* Read the ECC data following raw data */
644 MemReadDOC(docptr, eccbuf, 4);
645 eccbuf[4] = ReadDOC(docptr, Mplus_LastDataRead);
646 eccbuf[5] = ReadDOC(docptr, Mplus_LastDataRead);
648 /* Flush the pipeline */
649 dummy = ReadDOC(docptr, Mplus_ECCConf);
650 dummy = ReadDOC(docptr, Mplus_ECCConf);
652 /* Check the ECC Status */
653 if (ReadDOC(docptr, Mplus_ECCConf) & 0x80) {
655 /* There was an ECC error */
657 printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
659 /* Read the ECC syndrom through the DiskOnChip ECC logic.
660 These syndrome will be all ZERO when there is no error */
661 for (i = 0; i < 6; i++)
662 syndrome[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);
664 nb_errors = doc_decode_ecc(buf, syndrome);
666 printk("ECC Errors corrected: %x\n", nb_errors);
669 /* We return error, but have actually done the
670 read. Not that this can be told to user-space, via
671 sys_read(), but at least MTD-aware stuff can know
672 about it by checking *retlen */
674 printk("%s(%d): Millennium Plus ECC error (from=0x%x:\n",
675 __FILE__, __LINE__, (int)from);
676 printk(" syndrome= %02x:%02x:%02x:%02x:%02x:"
678 syndrome[0], syndrome[1], syndrome[2],
679 syndrome[3], syndrome[4], syndrome[5]);
680 printk(" eccbuf= %02x:%02x:%02x:%02x:%02x:"
682 eccbuf[0], eccbuf[1], eccbuf[2],
683 eccbuf[3], eccbuf[4], eccbuf[5]);
690 printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
691 (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
692 eccbuf[4], eccbuf[5]);
694 /* disable the ECC engine */
695 WriteDOC(DOC_ECC_DIS, docptr , Mplus_ECCConf);
697 /* Disable flash internally */
698 WriteDOC(0, docptr, Mplus_FlashSelect);
703 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
704 size_t *retlen, const u_char *buf)
706 int i, before, ret = 0;
710 struct DiskOnChip *this = mtd->priv;
711 void __iomem * docptr = this->virtadr;
712 struct Nand *mychip = &this->chips[to >> (this->chipshift)];
714 /* Don't allow write past end of device */
715 if (to >= this->totlen)
718 /* Don't allow writes which aren't exactly one block (512 bytes) */
719 if ((to & 0x1ff) || (len != 0x200))
722 /* Determine position of OOB flags, before or after data */
723 before = (this->interleave && (to & 0x200));
725 DoC_CheckASIC(docptr);
727 /* Find the chip which is to be used and select it */
728 if (this->curfloor != mychip->floor) {
729 DoC_SelectFloor(docptr, mychip->floor);
730 DoC_SelectChip(docptr, mychip->chip);
731 } else if (this->curchip != mychip->chip) {
732 DoC_SelectChip(docptr, mychip->chip);
734 this->curfloor = mychip->floor;
735 this->curchip = mychip->chip;
737 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
738 WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
740 /* Reset the chip, see Software Requirement 11.4 item 1. */
741 DoC_Command(docptr, NAND_CMD_RESET, 0);
742 DoC_WaitReady(docptr);
744 /* Set device to appropriate plane of flash */
746 WriteDOC(DoC_GetDataOffset(mtd, &fto), docptr, Mplus_FlashCmd);
748 /* On interleaved devices the flags for 2nd half 512 are before data */
752 /* issue the Serial Data In command to initial the Page Program process */
753 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
754 DoC_Address(this, 3, fto, 0x00, 0x00);
756 /* Disable the ECC engine */
757 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
760 /* Write the block status BLOCK_USED (0x5555) */
761 WriteDOC(0x55, docptr, Mil_CDSN_IO);
762 WriteDOC(0x55, docptr, Mil_CDSN_IO);
765 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
766 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf);
768 MemWriteDOC(docptr, (unsigned char *) buf, len);
770 /* Write ECC data to flash, the ECC info is generated by
771 the DiskOnChip ECC logic see Reed-Solomon EDC/ECC 11.1 */
772 DoC_Delay(docptr, 3);
774 /* Read the ECC data through the DiskOnChip ECC logic */
775 for (i = 0; i < 6; i++)
776 eccbuf[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);
778 /* disable the ECC engine */
779 WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
781 /* Write the ECC data to flash */
782 MemWriteDOC(docptr, eccbuf, 6);
785 /* Write the block status BLOCK_USED (0x5555) */
786 WriteDOC(0x55, docptr, Mil_CDSN_IO+6);
787 WriteDOC(0x55, docptr, Mil_CDSN_IO+7);
791 printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
792 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
793 eccbuf[4], eccbuf[5]);
796 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
797 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
799 /* Commit the Page Program command and wait for ready
800 see Software Requirement 11.4 item 1.*/
801 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
802 DoC_WaitReady(docptr);
804 /* Read the status of the flash device through CDSN IO register
805 see Software Requirement 11.4 item 5.*/
806 DoC_Command(docptr, NAND_CMD_STATUS, 0);
807 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
808 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
809 DoC_Delay(docptr, 2);
810 if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
811 printk("MTD: Error 0x%x programming at 0x%x\n", dummy, (int)to);
812 /* Error in programming
813 FIXME: implement Bad Block Replacement (in nftl.c ??) */
817 dummy = ReadDOC(docptr, Mplus_LastDataRead);
819 /* Disable flash internally */
820 WriteDOC(0, docptr, Mplus_FlashSelect);
822 /* Let the caller know we completed it */
828 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
829 struct mtd_oob_ops *ops)
832 struct DiskOnChip *this = mtd->priv;
833 void __iomem * docptr = this->virtadr;
834 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
835 size_t i, size, got, want;
836 uint8_t *buf = ops->oobbuf;
837 size_t len = ops->len;
839 BUG_ON(ops->mode != MTD_OOB_PLACE);
843 DoC_CheckASIC(docptr);
845 /* Find the chip which is to be used and select it */
846 if (this->curfloor != mychip->floor) {
847 DoC_SelectFloor(docptr, mychip->floor);
848 DoC_SelectChip(docptr, mychip->chip);
849 } else if (this->curchip != mychip->chip) {
850 DoC_SelectChip(docptr, mychip->chip);
852 this->curfloor = mychip->floor;
853 this->curchip = mychip->chip;
855 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
856 WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
858 /* disable the ECC engine */
859 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
860 DoC_WaitReady(docptr);
862 /* Maximum of 16 bytes in the OOB region, so limit read to that */
868 for (i = 0; ((i < 3) && (want > 0)); i++) {
869 /* Figure out which region we are accessing... */
872 if (!this->interleave) {
873 DoC_Command(docptr, NAND_CMD_READOOB, 0);
875 } else if (base < 6) {
876 DoC_Command(docptr, DoC_GetECCOffset(mtd, &fofs), 0);
878 } else if (base < 8) {
879 DoC_Command(docptr, DoC_GetFlagsOffset(mtd, &fofs), 0);
882 DoC_Command(docptr, DoC_GetHdrOffset(mtd, &fofs), 0);
888 /* Issue read command */
889 DoC_Address(this, 3, fofs, 0, 0x00);
890 WriteDOC(0, docptr, Mplus_FlashControl);
891 DoC_WaitReady(docptr);
893 ReadDOC(docptr, Mplus_ReadPipeInit);
894 ReadDOC(docptr, Mplus_ReadPipeInit);
895 MemReadDOC(docptr, &buf[got], size - 2);
896 buf[got + size - 2] = ReadDOC(docptr, Mplus_LastDataRead);
897 buf[got + size - 1] = ReadDOC(docptr, Mplus_LastDataRead);
904 /* Disable flash internally */
905 WriteDOC(0, docptr, Mplus_FlashSelect);
911 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
912 struct mtd_oob_ops *ops)
916 struct DiskOnChip *this = mtd->priv;
917 void __iomem * docptr = this->virtadr;
918 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
919 size_t i, size, got, want;
921 uint8_t *buf = ops->oobbuf;
922 size_t len = ops->len;
924 BUG_ON(ops->mode != MTD_OOB_PLACE);
928 DoC_CheckASIC(docptr);
930 /* Find the chip which is to be used and select it */
931 if (this->curfloor != mychip->floor) {
932 DoC_SelectFloor(docptr, mychip->floor);
933 DoC_SelectChip(docptr, mychip->chip);
934 } else if (this->curchip != mychip->chip) {
935 DoC_SelectChip(docptr, mychip->chip);
937 this->curfloor = mychip->floor;
938 this->curchip = mychip->chip;
940 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
941 WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
944 /* Maximum of 16 bytes in the OOB region, so limit write to that */
950 for (i = 0; ((i < 3) && (want > 0)); i++) {
951 /* Reset the chip, see Software Requirement 11.4 item 1. */
952 DoC_Command(docptr, NAND_CMD_RESET, 0);
953 DoC_WaitReady(docptr);
955 /* Figure out which region we are accessing... */
958 if (!this->interleave) {
959 WriteDOC(NAND_CMD_READOOB, docptr, Mplus_FlashCmd);
961 } else if (base < 6) {
962 WriteDOC(DoC_GetECCOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
964 } else if (base < 8) {
965 WriteDOC(DoC_GetFlagsOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
968 WriteDOC(DoC_GetHdrOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
974 /* Issue the Serial Data In command to initial the Page Program process */
975 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
976 DoC_Address(this, 3, fofs, 0, 0x00);
978 /* Disable the ECC engine */
979 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
981 /* Write the data via the internal pipeline through CDSN IO
982 register, see Pipelined Write Operations 11.2 */
983 MemWriteDOC(docptr, (unsigned char *) &buf[got], size);
984 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
985 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
987 /* Commit the Page Program command and wait for ready
988 see Software Requirement 11.4 item 1.*/
989 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
990 DoC_WaitReady(docptr);
992 /* Read the status of the flash device through CDSN IO register
993 see Software Requirement 11.4 item 5.*/
994 DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
995 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
996 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
997 DoC_Delay(docptr, 2);
998 if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
999 printk("MTD: Error 0x%x programming oob at 0x%x\n",
1001 /* FIXME: implement Bad Block Replacement */
1005 dummy = ReadDOC(docptr, Mplus_LastDataRead);
1012 /* Disable flash internally */
1013 WriteDOC(0, docptr, Mplus_FlashSelect);
1019 int doc_erase(struct mtd_info *mtd, struct erase_info *instr)
1021 volatile char dummy;
1022 struct DiskOnChip *this = mtd->priv;
1023 __u32 ofs = instr->addr;
1024 __u32 len = instr->len;
1025 void __iomem * docptr = this->virtadr;
1026 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
1028 DoC_CheckASIC(docptr);
1030 if (len != mtd->erasesize)
1031 printk(KERN_WARNING "MTD: Erase not right size (%x != %x)n",
1032 len, mtd->erasesize);
1034 /* Find the chip which is to be used and select it */
1035 if (this->curfloor != mychip->floor) {
1036 DoC_SelectFloor(docptr, mychip->floor);
1037 DoC_SelectChip(docptr, mychip->chip);
1038 } else if (this->curchip != mychip->chip) {
1039 DoC_SelectChip(docptr, mychip->chip);
1041 this->curfloor = mychip->floor;
1042 this->curchip = mychip->chip;
1044 instr->state = MTD_ERASE_PENDING;
1046 /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
1047 WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
1049 DoC_Command(docptr, NAND_CMD_RESET, 0x00);
1050 DoC_WaitReady(docptr);
1052 DoC_Command(docptr, NAND_CMD_ERASE1, 0);
1053 DoC_Address(this, 2, ofs, 0, 0x00);
1054 DoC_Command(docptr, NAND_CMD_ERASE2, 0);
1055 DoC_WaitReady(docptr);
1056 instr->state = MTD_ERASING;
1058 /* Read the status of the flash device through CDSN IO register
1059 see Software Requirement 11.4 item 5. */
1060 DoC_Command(docptr, NAND_CMD_STATUS, 0);
1061 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
1062 dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
1063 if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
1064 printk("MTD: Error 0x%x erasing at 0x%x\n", dummy, ofs);
1065 /* FIXME: implement Bad Block Replacement (in nftl.c ??) */
1066 instr->state = MTD_ERASE_FAILED;
1068 instr->state = MTD_ERASE_DONE;
1070 dummy = ReadDOC(docptr, Mplus_LastDataRead);
1072 /* Disable flash internally */
1073 WriteDOC(0, docptr, Mplus_FlashSelect);
1075 mtd_erase_callback(instr);
1080 /****************************************************************************
1084 ****************************************************************************/
1086 static void __exit cleanup_doc2001plus(void)
1088 struct mtd_info *mtd;
1089 struct DiskOnChip *this;
1091 while ((mtd=docmilpluslist)) {
1093 docmilpluslist = this->nextdoc;
1095 del_mtd_device(mtd);
1097 iounmap(this->virtadr);
1103 module_exit(cleanup_doc2001plus);
1105 MODULE_LICENSE("GPL");
1106 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com> et al.");
1107 MODULE_DESCRIPTION("Driver for DiskOnChip Millennium Plus");