3 * Linux driver for Disk-On-Chip 2000 and Millennium
4 * (c) 1999 Machine Vision Holdings, Inc.
5 * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
7 * $Id: doc2000.c,v 1.53 2003/06/11 09:45:19 dwmw2 Exp $
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <asm/errno.h>
14 #include <asm/uaccess.h>
15 #include <linux/miscdevice.h>
16 #include <linux/pci.h>
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/sched.h>
20 #include <linux/init.h>
21 #include <linux/types.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/nand.h>
25 #include <linux/mtd/doc2000.h>
27 #define DOC_SUPPORT_2000
28 #define DOC_SUPPORT_MILLENNIUM
30 #ifdef DOC_SUPPORT_2000
31 #define DoC_is_2000(doc) (doc->ChipID == DOC_ChipID_Doc2k)
33 #define DoC_is_2000(doc) (0)
36 #ifdef DOC_SUPPORT_MILLENNIUM
37 #define DoC_is_Millennium(doc) (doc->ChipID == DOC_ChipID_DocMil)
39 #define DoC_is_Millennium(doc) (0)
42 /* #define ECC_DEBUG */
44 /* I have no idea why some DoC chips can not use memcpy_from|to_io().
45 * This may be due to the different revisions of the ASIC controller built-in or
46 * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment
51 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
52 size_t *retlen, u_char *buf);
53 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
54 size_t *retlen, const u_char *buf);
55 static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
56 size_t *retlen, u_char *buf, u_char *eccbuf,
57 struct nand_oobinfo *unused);
58 static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
59 size_t *retlen, const u_char *buf, u_char *eccbuf,
60 struct nand_oobinfo *unused);
61 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, size_t len,
62 size_t *retlen, u_char *buf);
63 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, size_t len,
64 size_t *retlen, const u_char *buf);
65 static int doc_write_oob_nolock(struct mtd_info *mtd, loff_t ofs, size_t len,
66 size_t *retlen, const u_char *buf);
67 static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
69 static struct mtd_info *doc2klist = NULL;
71 /* Perform the required delay cycles by reading from the appropriate register */
72 static void DoC_Delay(struct DiskOnChip *doc, unsigned short cycles)
77 for (i = 0; i < cycles; i++) {
78 if (DoC_is_Millennium(doc))
79 dummy = ReadDOC(doc->virtadr, NOP);
81 dummy = ReadDOC(doc->virtadr, DOCStatus);
86 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
87 static int _DoC_WaitReady(struct DiskOnChip *doc)
89 unsigned long docptr = doc->virtadr;
90 unsigned long timeo = jiffies + (HZ * 10);
92 DEBUG(MTD_DEBUG_LEVEL3,
93 "_DoC_WaitReady called for out-of-line wait\n");
95 /* Out-of-line routine to wait for chip response */
96 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
97 if (time_after(jiffies, timeo)) {
98 DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");
108 static inline int DoC_WaitReady(struct DiskOnChip *doc)
110 unsigned long docptr = doc->virtadr;
111 /* This is inline, to optimise the common case, where it's ready instantly */
114 /* 4 read form NOP register should be issued in prior to the read from CDSNControl
115 see Software Requirement 11.4 item 2. */
118 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
119 /* Call the out-of-line routine to wait */
120 ret = _DoC_WaitReady(doc);
122 /* issue 2 read from NOP register after reading from CDSNControl register
123 see Software Requirement 11.4 item 2. */
129 /* DoC_Command: Send a flash command to the flash chip through the CDSN Slow IO register to
130 bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
131 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
133 static inline int DoC_Command(struct DiskOnChip *doc, unsigned char command,
134 unsigned char xtraflags)
136 unsigned long docptr = doc->virtadr;
138 if (DoC_is_2000(doc))
139 xtraflags |= CDSN_CTRL_FLASH_IO;
141 /* Assert the CLE (Command Latch Enable) line to the flash chip */
142 WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
143 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
145 if (DoC_is_Millennium(doc))
146 WriteDOC(command, docptr, CDSNSlowIO);
148 /* Send the command */
149 WriteDOC_(command, docptr, doc->ioreg);
151 /* Lower the CLE line */
152 WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
153 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
155 /* Wait for the chip to respond - Software requirement 11.4.1 (extended for any command) */
156 return DoC_WaitReady(doc);
159 /* DoC_Address: Set the current address for the flash chip through the CDSN Slow IO register to
160 bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
161 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
163 static int DoC_Address(struct DiskOnChip *doc, int numbytes, unsigned long ofs,
164 unsigned char xtraflags1, unsigned char xtraflags2)
166 unsigned long docptr;
169 docptr = doc->virtadr;
171 if (DoC_is_2000(doc))
172 xtraflags1 |= CDSN_CTRL_FLASH_IO;
174 /* Assert the ALE (Address Latch Enable) line to the flash chip */
175 WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
177 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
179 /* Send the address */
180 /* Devices with 256-byte page are addressed as:
181 Column (bits 0-7), Page (bits 8-15, 16-23, 24-31)
182 * there is no device on the market with page256
183 and more than 24 bits.
184 Devices with 512-byte page are addressed as:
185 Column (bits 0-7), Page (bits 9-16, 17-24, 25-31)
186 * 25-31 is sent only if the chip support it.
187 * bit 8 changes the read command to be sent
188 (NAND_CMD_READ0 or NAND_CMD_READ1).
191 if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE) {
192 if (DoC_is_Millennium(doc))
193 WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
194 WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
203 if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE) {
204 for (i = 0; i < doc->pageadrlen; i++, ofs = ofs >> 8) {
205 if (DoC_is_Millennium(doc))
206 WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
207 WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
211 DoC_Delay(doc, 2); /* Needed for some slow flash chips. mf. */
213 /* FIXME: The SlowIO's for millennium could be replaced by
214 a single WritePipeTerm here. mf. */
216 /* Lower the ALE line */
217 WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr,
220 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
222 /* Wait for the chip to respond - Software requirement 11.4.1 */
223 return DoC_WaitReady(doc);
226 /* Read a buffer from DoC, taking care of Millennium odditys */
227 static void DoC_ReadBuf(struct DiskOnChip *doc, u_char * buf, int len)
230 int modulus = 0xffff;
231 unsigned long docptr;
234 docptr = doc->virtadr;
239 if (DoC_is_Millennium(doc)) {
240 /* Read the data via the internal pipeline through CDSN IO register,
241 see Pipelined Read Operations 11.3 */
242 dummy = ReadDOC(docptr, ReadPipeInit);
244 /* Millennium should use the LastDataRead register - Pipeline Reads */
247 /* This is needed for correctly ECC calculation */
251 for (i = 0; i < len; i++)
252 buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus));
254 if (DoC_is_Millennium(doc)) {
255 buf[i] = ReadDOC(docptr, LastDataRead);
259 /* Write a buffer to DoC, taking care of Millennium odditys */
260 static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len)
262 unsigned long docptr;
265 docptr = doc->virtadr;
270 for (i = 0; i < len; i++)
271 WriteDOC_(buf[i], docptr, doc->ioreg + i);
273 if (DoC_is_Millennium(doc)) {
274 WriteDOC(0x00, docptr, WritePipeTerm);
279 /* DoC_SelectChip: Select a given flash chip within the current floor */
281 static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip)
283 unsigned long docptr = doc->virtadr;
285 /* Software requirement 11.4.4 before writing DeviceSelect */
286 /* Deassert the CE line to eliminate glitches on the FCE# outputs */
287 WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl);
288 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
290 /* Select the individual flash chip requested */
291 WriteDOC(chip, docptr, CDSNDeviceSelect);
294 /* Reassert the CE line */
295 WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr,
297 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
299 /* Wait for it to be ready */
300 return DoC_WaitReady(doc);
303 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
305 static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor)
307 unsigned long docptr = doc->virtadr;
309 /* Select the floor (bank) of chips required */
310 WriteDOC(floor, docptr, FloorSelect);
312 /* Wait for the chip to be ready */
313 return DoC_WaitReady(doc);
316 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
318 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
323 /* Page in the required floor/chip */
324 DoC_SelectFloor(doc, floor);
325 DoC_SelectChip(doc, chip);
328 if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) {
329 DEBUG(MTD_DEBUG_LEVEL2,
330 "DoC_Command (reset) for %d,%d returned true\n",
336 /* Read the NAND chip ID: 1. Send ReadID command */
337 if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) {
338 DEBUG(MTD_DEBUG_LEVEL2,
339 "DoC_Command (ReadID) for %d,%d returned true\n",
344 /* Read the NAND chip ID: 2. Send address byte zero */
345 DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0);
347 /* Read the manufacturer and device id codes from the device */
349 /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
350 dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
352 mfr = ReadDOC_(doc->virtadr, doc->ioreg);
354 /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
355 dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
357 id = ReadDOC_(doc->virtadr, doc->ioreg);
359 /* No response - return failure */
360 if (mfr == 0xff || mfr == 0)
363 /* Check it's the same as the first chip we identified.
364 * M-Systems say that any given DiskOnChip device should only
365 * contain _one_ type of flash part, although that's not a
366 * hardware restriction. */
368 if (doc->mfr == mfr && doc->id == id)
369 return 1; /* This is another the same the first */
372 "Flash chip at floor %d, chip %d is different:\n",
376 /* Print and store the manufacturer and ID codes. */
377 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
378 if (id == nand_flash_ids[i].id) {
379 /* Try to identify manufacturer */
380 for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
381 if (nand_manuf_ids[j].id == mfr)
385 "Flash chip found: Manufacturer ID: %2.2X, "
386 "Chip ID: %2.2X (%s:%s)\n", mfr, id,
387 nand_manuf_ids[j].name, nand_flash_ids[i].name);
392 nand_flash_ids[i].chipshift;
393 doc->page256 = nand_flash_ids[i].page256;
395 nand_flash_ids[i].chipshift > 25 ? 3 : 2;
397 nand_flash_ids[i].erasesize;
405 /* We haven't fully identified the chip. Print as much as we know. */
406 printk(KERN_WARNING "Unknown flash chip found: %2.2X %2.2X\n",
409 printk(KERN_WARNING "Please report to dwmw2@infradead.org\n");
413 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
415 static void DoC_ScanChips(struct DiskOnChip *this)
418 int numchips[MAX_FLOORS];
419 int maxchips = MAX_CHIPS;
426 if (DoC_is_Millennium(this))
427 maxchips = MAX_CHIPS_MIL;
429 /* For each floor, find the number of valid chips it contains */
430 for (floor = 0; floor < MAX_FLOORS; floor++) {
433 for (chip = 0; chip < maxchips && ret != 0; chip++) {
435 ret = DoC_IdentChip(this, floor, chip);
443 /* If there are none at all that we recognise, bail */
444 if (!this->numchips) {
445 printk(KERN_NOTICE "No flash chips recognised.\n");
449 /* Allocate an array to hold the information for each chip */
450 this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
452 printk(KERN_NOTICE "No memory for allocating chip info structures\n");
458 /* Fill out the chip array with {floor, chipno} for each
459 * detected chip in the device. */
460 for (floor = 0; floor < MAX_FLOORS; floor++) {
461 for (chip = 0; chip < numchips[floor]; chip++) {
462 this->chips[ret].floor = floor;
463 this->chips[ret].chip = chip;
464 this->chips[ret].curadr = 0;
465 this->chips[ret].curmode = 0x50;
470 /* Calculate and print the total size of the device */
471 this->totlen = this->numchips * (1 << this->chipshift);
473 printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
474 this->numchips, this->totlen >> 20);
477 static int DoC2k_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
479 int tmp1, tmp2, retval;
480 if (doc1->physadr == doc2->physadr)
483 /* Use the alias resolution register which was set aside for this
484 * purpose. If it's value is the same on both chips, they might
485 * be the same chip, and we write to one and check for a change in
486 * the other. It's unclear if this register is usuable in the
487 * DoC 2000 (it's in the Millennium docs), but it seems to work. */
488 tmp1 = ReadDOC(doc1->virtadr, AliasResolution);
489 tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
493 WriteDOC((tmp1 + 1) % 0xff, doc1->virtadr, AliasResolution);
494 tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
495 if (tmp2 == (tmp1 + 1) % 0xff)
500 /* Restore register contents. May not be necessary, but do it just to
502 WriteDOC(tmp1, doc1->virtadr, AliasResolution);
507 static const char im_name[] = "DoC2k_init";
509 /* This routine is made available to other mtd code via
510 * inter_module_register. It must only be accessed through
511 * inter_module_get which will bump the use count of this module. The
512 * addresses passed back in mtd are valid as long as the use count of
513 * this module is non-zero, i.e. between inter_module_get and
514 * inter_module_put. Keith Owens <kaos@ocs.com.au> 29 Oct 2000.
516 static void DoC2k_init(struct mtd_info *mtd)
518 struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
519 struct DiskOnChip *old = NULL;
521 /* We must avoid being called twice for the same device. */
524 old = (struct DiskOnChip *) doc2klist->priv;
527 if (DoC2k_is_alias(old, this)) {
529 "Ignoring DiskOnChip 2000 at 0x%lX - already configured\n",
531 iounmap((void *) this->virtadr);
536 old = (struct DiskOnChip *) old->nextdoc->priv;
542 switch (this->ChipID) {
543 case DOC_ChipID_Doc2k:
544 mtd->name = "DiskOnChip 2000";
545 this->ioreg = DoC_2k_CDSN_IO;
547 case DOC_ChipID_DocMil:
548 mtd->name = "DiskOnChip Millennium";
549 this->ioreg = DoC_Mil_CDSN_IO;
553 printk(KERN_NOTICE "%s found at address 0x%lX\n", mtd->name,
556 mtd->type = MTD_NANDFLASH;
557 mtd->flags = MTD_CAP_NANDFLASH;
558 mtd->ecctype = MTD_ECC_RS_DiskOnChip;
563 mtd->owner = THIS_MODULE;
564 mtd->erase = doc_erase;
567 mtd->read = doc_read;
568 mtd->write = doc_write;
569 mtd->read_ecc = doc_read_ecc;
570 mtd->write_ecc = doc_write_ecc;
571 mtd->read_oob = doc_read_oob;
572 mtd->write_oob = doc_write_oob;
580 init_MUTEX(&this->lock);
582 /* Ident all the chips present. */
587 iounmap((void *) this->virtadr);
589 this->nextdoc = doc2klist;
591 mtd->size = this->totlen;
592 mtd->erasesize = this->erasesize;
598 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
599 size_t * retlen, u_char * buf)
601 /* Just a special case of doc_read_ecc */
602 return doc_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
605 static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
606 size_t * retlen, u_char * buf, u_char * eccbuf,
607 struct nand_oobinfo *unused)
609 struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
610 unsigned long docptr;
612 unsigned char syndrome[6];
614 int i, len256 = 0, ret=0;
616 docptr = this->virtadr;
618 /* Don't allow read past end of device */
619 if (from >= this->totlen)
624 /* Don't allow a single read to cross a 512-byte block boundary */
625 if (from + len > ((from | 0x1ff) + 1))
626 len = ((from | 0x1ff) + 1) - from;
628 /* The ECC will not be calculated correctly if less than 512 is read */
629 if (len != 0x200 && eccbuf)
631 "ECC needs a full sector read (adr: %lx size %lx)\n",
632 (long) from, (long) len);
634 /* printk("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len); */
637 /* Find the chip which is to be used and select it */
638 mychip = &this->chips[from >> (this->chipshift)];
640 if (this->curfloor != mychip->floor) {
641 DoC_SelectFloor(this, mychip->floor);
642 DoC_SelectChip(this, mychip->chip);
643 } else if (this->curchip != mychip->chip) {
644 DoC_SelectChip(this, mychip->chip);
647 this->curfloor = mychip->floor;
648 this->curchip = mychip->chip;
652 && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
654 DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP,
658 /* Prime the ECC engine */
659 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
660 WriteDOC(DOC_ECC_EN, docptr, ECCConf);
662 /* disable the ECC engine */
663 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
664 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
667 /* treat crossing 256-byte sector for 2M x 8bits devices */
668 if (this->page256 && from + len > (from | 0xff) + 1) {
669 len256 = (from | 0xff) + 1 - from;
670 DoC_ReadBuf(this, buf, len256);
672 DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP);
673 DoC_Address(this, ADDR_COLUMN_PAGE, from + len256,
674 CDSN_CTRL_WP, CDSN_CTRL_ECC_IO);
677 DoC_ReadBuf(this, &buf[len256], len - len256);
679 /* Let the caller know we completed it */
683 /* Read the ECC data through the DiskOnChip ECC logic */
684 /* Note: this will work even with 2M x 8bit devices as */
685 /* they have 8 bytes of OOB per 256 page. mf. */
686 DoC_ReadBuf(this, eccbuf, 6);
688 /* Flush the pipeline */
689 if (DoC_is_Millennium(this)) {
690 dummy = ReadDOC(docptr, ECCConf);
691 dummy = ReadDOC(docptr, ECCConf);
692 i = ReadDOC(docptr, ECCConf);
694 dummy = ReadDOC(docptr, 2k_ECCStatus);
695 dummy = ReadDOC(docptr, 2k_ECCStatus);
696 i = ReadDOC(docptr, 2k_ECCStatus);
699 /* Check the ECC Status */
702 /* There was an ECC error */
704 printk(KERN_ERR "DiskOnChip ECC Error: Read at %lx\n", (long)from);
706 /* Read the ECC syndrom through the DiskOnChip ECC logic.
707 These syndrome will be all ZERO when there is no error */
708 for (i = 0; i < 6; i++) {
710 ReadDOC(docptr, ECCSyndrome0 + i);
712 nb_errors = doc_decode_ecc(buf, syndrome);
715 printk(KERN_ERR "Errors corrected: %x\n", nb_errors);
718 /* We return error, but have actually done the read. Not that
719 this can be told to user-space, via sys_read(), but at least
720 MTD-aware stuff can know about it by checking *retlen */
726 printk(KERN_DEBUG "ECC DATA at %lxB: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
727 (long)from, eccbuf[0], eccbuf[1], eccbuf[2],
728 eccbuf[3], eccbuf[4], eccbuf[5]);
731 /* disable the ECC engine */
732 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
735 /* according to 11.4.1, we need to wait for the busy line
736 * drop if we read to the end of the page. */
737 if(0 == ((from + *retlen) & 0x1ff))
747 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
748 size_t * retlen, const u_char * buf)
751 return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf, NULL);
754 static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
755 size_t * retlen, const u_char * buf,
757 struct nand_oobinfo *unused)
759 struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
760 int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */
761 unsigned long docptr;
766 docptr = this->virtadr;
768 /* Don't allow write past end of device */
769 if (to >= this->totlen)
774 /* Don't allow a single write to cross a 512-byte block boundary */
775 if (to + len > ((to | 0x1ff) + 1))
776 len = ((to | 0x1ff) + 1) - to;
778 /* The ECC will not be calculated correctly if less than 512 is written */
779 if (len != 0x200 && eccbuf)
781 "ECC needs a full sector write (adr: %lx size %lx)\n",
782 (long) to, (long) len);
784 /* printk("DoC_Write (adr: %lx size %lx)\n", (long) to, (long) len); */
786 /* Find the chip which is to be used and select it */
787 mychip = &this->chips[to >> (this->chipshift)];
789 if (this->curfloor != mychip->floor) {
790 DoC_SelectFloor(this, mychip->floor);
791 DoC_SelectChip(this, mychip->chip);
792 } else if (this->curchip != mychip->chip) {
793 DoC_SelectChip(this, mychip->chip);
796 this->curfloor = mychip->floor;
797 this->curchip = mychip->chip;
799 /* Set device to main plane of flash */
800 DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
803 && (to & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
806 DoC_Command(this, NAND_CMD_SEQIN, 0);
807 DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO);
810 /* Prime the ECC engine */
811 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
812 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
814 /* disable the ECC engine */
815 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
816 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
819 /* treat crossing 256-byte sector for 2M x 8bits devices */
820 if (this->page256 && to + len > (to | 0xff) + 1) {
821 len256 = (to | 0xff) + 1 - to;
822 DoC_WriteBuf(this, buf, len256);
824 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
826 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
827 /* There's an implicit DoC_WaitReady() in DoC_Command */
829 dummy = ReadDOC(docptr, CDSNSlowIO);
832 if (ReadDOC_(docptr, this->ioreg) & 1) {
833 printk(KERN_ERR "Error programming flash\n");
834 /* Error in programming */
840 DoC_Command(this, NAND_CMD_SEQIN, 0);
841 DoC_Address(this, ADDR_COLUMN_PAGE, to + len256, 0,
845 DoC_WriteBuf(this, &buf[len256], len - len256);
848 WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_CE, docptr,
851 if (DoC_is_Millennium(this)) {
852 WriteDOC(0, docptr, NOP);
853 WriteDOC(0, docptr, NOP);
854 WriteDOC(0, docptr, NOP);
856 WriteDOC_(0, docptr, this->ioreg);
857 WriteDOC_(0, docptr, this->ioreg);
858 WriteDOC_(0, docptr, this->ioreg);
861 /* Read the ECC data through the DiskOnChip ECC logic */
862 for (di = 0; di < 6; di++) {
863 eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di);
866 /* Reset the ECC engine */
867 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
871 ("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
872 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
873 eccbuf[4], eccbuf[5]);
877 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
879 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
880 /* There's an implicit DoC_WaitReady() in DoC_Command */
882 dummy = ReadDOC(docptr, CDSNSlowIO);
885 if (ReadDOC_(docptr, this->ioreg) & 1) {
886 printk(KERN_ERR "Error programming flash\n");
887 /* Error in programming */
893 /* Let the caller know we completed it */
901 /* Write the ECC data to flash */
902 for (di=0; di<6; di++)
908 ret = doc_write_oob_nolock(mtd, to, 8, &dummy, x);
916 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, size_t len,
917 size_t * retlen, u_char * buf)
919 struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
921 unsigned long docptr;
926 docptr = this->virtadr;
928 mychip = &this->chips[ofs >> this->chipshift];
930 if (this->curfloor != mychip->floor) {
931 DoC_SelectFloor(this, mychip->floor);
932 DoC_SelectChip(this, mychip->chip);
933 } else if (this->curchip != mychip->chip) {
934 DoC_SelectChip(this, mychip->chip);
936 this->curfloor = mychip->floor;
937 this->curchip = mychip->chip;
939 /* update address for 2M x 8bit devices. OOB starts on the second */
940 /* page to maintain compatibility with doc_read_ecc. */
948 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
949 DoC_Address(this, ADDR_COLUMN_PAGE, ofs, CDSN_CTRL_WP, 0);
951 /* treat crossing 8-byte OOB data for 2M x 8bit devices */
952 /* Note: datasheet says it should automaticaly wrap to the */
953 /* next OOB block, but it didn't work here. mf. */
954 if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
955 len256 = (ofs | 0x7) + 1 - ofs;
956 DoC_ReadBuf(this, buf, len256);
958 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
959 DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff),
963 DoC_ReadBuf(this, &buf[len256], len - len256);
966 /* Reading the full OOB data drops us off of the end of the page,
967 * causing the flash device to go into busy mode, so we need
968 * to wait until ready 11.4.1 and Toshiba TC58256FT docs */
970 ret = DoC_WaitReady(this);
977 static int doc_write_oob_nolock(struct mtd_info *mtd, loff_t ofs, size_t len,
978 size_t * retlen, const u_char * buf)
980 struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
982 unsigned long docptr = this->virtadr;
983 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
986 // printk("doc_write_oob(%lx, %d): %2.2X %2.2X %2.2X %2.2X ... %2.2X %2.2X .. %2.2X %2.2X\n",(long)ofs, len,
987 // buf[0], buf[1], buf[2], buf[3], buf[8], buf[9], buf[14],buf[15]);
989 /* Find the chip which is to be used and select it */
990 if (this->curfloor != mychip->floor) {
991 DoC_SelectFloor(this, mychip->floor);
992 DoC_SelectChip(this, mychip->chip);
993 } else if (this->curchip != mychip->chip) {
994 DoC_SelectChip(this, mychip->chip);
996 this->curfloor = mychip->floor;
997 this->curchip = mychip->chip;
999 /* disable the ECC engine */
1000 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
1001 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
1003 /* Reset the chip, see Software Requirement 11.4 item 1. */
1004 DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
1006 /* issue the Read2 command to set the pointer to the Spare Data Area. */
1007 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1009 /* update address for 2M x 8bit devices. OOB starts on the second */
1010 /* page to maintain compatibility with doc_read_ecc. */
1011 if (this->page256) {
1018 /* issue the Serial Data In command to initial the Page Program process */
1019 DoC_Command(this, NAND_CMD_SEQIN, 0);
1020 DoC_Address(this, ADDR_COLUMN_PAGE, ofs, 0, 0);
1022 /* treat crossing 8-byte OOB data for 2M x 8bit devices */
1023 /* Note: datasheet says it should automaticaly wrap to the */
1024 /* next OOB block, but it didn't work here. mf. */
1025 if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
1026 len256 = (ofs | 0x7) + 1 - ofs;
1027 DoC_WriteBuf(this, buf, len256);
1029 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1030 DoC_Command(this, NAND_CMD_STATUS, 0);
1031 /* DoC_WaitReady() is implicit in DoC_Command */
1033 dummy = ReadDOC(docptr, CDSNSlowIO);
1036 if (ReadDOC_(docptr, this->ioreg) & 1) {
1037 printk(KERN_ERR "Error programming oob data\n");
1038 /* There was an error */
1042 DoC_Command(this, NAND_CMD_SEQIN, 0);
1043 DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), 0, 0);
1046 DoC_WriteBuf(this, &buf[len256], len - len256);
1048 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1049 DoC_Command(this, NAND_CMD_STATUS, 0);
1050 /* DoC_WaitReady() is implicit in DoC_Command */
1052 dummy = ReadDOC(docptr, CDSNSlowIO);
1055 if (ReadDOC_(docptr, this->ioreg) & 1) {
1056 printk(KERN_ERR "Error programming oob data\n");
1057 /* There was an error */
1067 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, size_t len,
1068 size_t * retlen, const u_char * buf)
1070 struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
1074 ret = doc_write_oob_nolock(mtd, ofs, len, retlen, buf);
1080 static int doc_erase(struct mtd_info *mtd, struct erase_info *instr)
1082 struct DiskOnChip *this = (struct DiskOnChip *) mtd->priv;
1083 __u32 ofs = instr->addr;
1084 __u32 len = instr->len;
1086 unsigned long docptr;
1087 struct Nand *mychip;
1091 if (ofs & (mtd->erasesize-1) || len & (mtd->erasesize-1)) {
1096 instr->state = MTD_ERASING;
1098 docptr = this->virtadr;
1100 /* FIXME: Do this in the background. Use timers or schedule_task() */
1102 mychip = &this->chips[ofs >> this->chipshift];
1104 if (this->curfloor != mychip->floor) {
1105 DoC_SelectFloor(this, mychip->floor);
1106 DoC_SelectChip(this, mychip->chip);
1107 } else if (this->curchip != mychip->chip) {
1108 DoC_SelectChip(this, mychip->chip);
1110 this->curfloor = mychip->floor;
1111 this->curchip = mychip->chip;
1113 DoC_Command(this, NAND_CMD_ERASE1, 0);
1114 DoC_Address(this, ADDR_PAGE, ofs, 0, 0);
1115 DoC_Command(this, NAND_CMD_ERASE2, 0);
1117 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1119 dummy = ReadDOC(docptr, CDSNSlowIO);
1122 if (ReadDOC_(docptr, this->ioreg) & 1) {
1123 printk(KERN_ERR "Error erasing at 0x%x\n", ofs);
1124 /* There was an error */
1125 instr->state = MTD_ERASE_FAILED;
1128 ofs += mtd->erasesize;
1129 len -= mtd->erasesize;
1131 instr->state = MTD_ERASE_DONE;
1134 if (instr->callback)
1135 instr->callback(instr);
1142 /****************************************************************************
1146 ****************************************************************************/
1148 int __init init_doc2000(void)
1150 inter_module_register(im_name, THIS_MODULE, &DoC2k_init);
1154 static void __exit cleanup_doc2000(void)
1156 struct mtd_info *mtd;
1157 struct DiskOnChip *this;
1159 while ((mtd = doc2klist)) {
1160 this = (struct DiskOnChip *) mtd->priv;
1161 doc2klist = this->nextdoc;
1163 del_mtd_device(mtd);
1165 iounmap((void *) this->virtadr);
1169 inter_module_unregister(im_name);
1172 module_exit(cleanup_doc2000);
1173 module_init(init_doc2000);
1175 MODULE_LICENSE("GPL");
1176 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
1177 MODULE_DESCRIPTION("MTD driver for DiskOnChip 2000 and Millennium");