3 * Linux driver for Disk-On-Chip Millennium
4 * (c) 1999 Machine Vision Holdings, Inc.
5 * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
7 * $Id: doc2001.c,v 1.49 2005/11/07 11:14:24 gleixner 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/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 *docmillist = NULL;
47 /* Perform the required delay cycles by reading from the NOP register */
48 static void DoC_Delay(void __iomem * docptr, unsigned short cycles)
53 for (i = 0; i < cycles; i++)
54 dummy = ReadDOC(docptr, NOP);
57 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
58 static int _DoC_WaitReady(void __iomem * docptr)
60 unsigned short c = 0xffff;
62 DEBUG(MTD_DEBUG_LEVEL3,
63 "_DoC_WaitReady called for out-of-line wait\n");
65 /* Out-of-line routine to wait for chip response */
66 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B) && --c)
70 DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");
75 static inline int DoC_WaitReady(void __iomem * docptr)
77 /* This is inline, to optimise the common case, where it's ready instantly */
80 /* 4 read form NOP register should be issued in prior to the read from CDSNControl
81 see Software Requirement 11.4 item 2. */
84 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
85 /* Call the out-of-line routine to wait */
86 ret = _DoC_WaitReady(docptr);
88 /* issue 2 read from NOP register after reading from CDSNControl register
89 see Software Requirement 11.4 item 2. */
95 /* DoC_Command: Send a flash command to the flash chip through the CDSN IO register
96 with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
97 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
99 static void DoC_Command(void __iomem * docptr, unsigned char command,
100 unsigned char xtraflags)
102 /* Assert the CLE (Command Latch Enable) line to the flash chip */
103 WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
104 DoC_Delay(docptr, 4);
106 /* Send the command */
107 WriteDOC(command, docptr, Mil_CDSN_IO);
108 WriteDOC(0x00, docptr, WritePipeTerm);
110 /* Lower the CLE line */
111 WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
112 DoC_Delay(docptr, 4);
115 /* DoC_Address: Set the current address for the flash chip through the CDSN IO register
116 with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
117 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
119 static inline void DoC_Address(void __iomem * docptr, int numbytes, unsigned long ofs,
120 unsigned char xtraflags1, unsigned char xtraflags2)
122 /* Assert the ALE (Address Latch Enable) line to the flash chip */
123 WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
124 DoC_Delay(docptr, 4);
126 /* Send the address */
130 /* Send single byte, bits 0-7. */
131 WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
132 WriteDOC(0x00, docptr, WritePipeTerm);
135 /* Send bits 9-16 followed by 17-23 */
136 WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO);
137 WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
138 WriteDOC(0x00, docptr, WritePipeTerm);
141 /* Send 0-7, 9-16, then 17-23 */
142 WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
143 WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO);
144 WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
145 WriteDOC(0x00, docptr, WritePipeTerm);
151 /* Lower the ALE line */
152 WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, CDSNControl);
153 DoC_Delay(docptr, 4);
156 /* DoC_SelectChip: Select a given flash chip within the current floor */
157 static int DoC_SelectChip(void __iomem * docptr, int chip)
159 /* Select the individual flash chip requested */
160 WriteDOC(chip, docptr, CDSNDeviceSelect);
161 DoC_Delay(docptr, 4);
163 /* Wait for it to be ready */
164 return DoC_WaitReady(docptr);
167 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
168 static int DoC_SelectFloor(void __iomem * docptr, int floor)
170 /* Select the floor (bank) of chips required */
171 WriteDOC(floor, docptr, FloorSelect);
173 /* Wait for the chip to be ready */
174 return DoC_WaitReady(docptr);
177 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
178 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
183 /* Page in the required floor/chip
184 FIXME: is this supported by Millennium ?? */
185 DoC_SelectFloor(doc->virtadr, floor);
186 DoC_SelectChip(doc->virtadr, chip);
188 /* Reset the chip, see Software Requirement 11.4 item 1. */
189 DoC_Command(doc->virtadr, NAND_CMD_RESET, CDSN_CTRL_WP);
190 DoC_WaitReady(doc->virtadr);
192 /* Read the NAND chip ID: 1. Send ReadID command */
193 DoC_Command(doc->virtadr, NAND_CMD_READID, CDSN_CTRL_WP);
195 /* Read the NAND chip ID: 2. Send address byte zero */
196 DoC_Address(doc->virtadr, 1, 0x00, CDSN_CTRL_WP, 0x00);
198 /* Read the manufacturer and device id codes of the flash device through
199 CDSN IO register see Software Requirement 11.4 item 5.*/
200 dummy = ReadDOC(doc->virtadr, ReadPipeInit);
201 DoC_Delay(doc->virtadr, 2);
202 mfr = ReadDOC(doc->virtadr, Mil_CDSN_IO);
204 DoC_Delay(doc->virtadr, 2);
205 id = ReadDOC(doc->virtadr, Mil_CDSN_IO);
206 dummy = ReadDOC(doc->virtadr, LastDataRead);
208 /* No response - return failure */
209 if (mfr == 0xff || mfr == 0)
212 /* FIXME: to deal with multi-flash on multi-Millennium case more carefully */
213 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
214 if ( id == nand_flash_ids[i].id) {
215 /* Try to identify manufacturer */
216 for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
217 if (nand_manuf_ids[j].id == mfr)
220 printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
221 "Chip ID: %2.2X (%s:%s)\n",
222 mfr, id, nand_manuf_ids[j].name, nand_flash_ids[i].name);
225 doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
230 if (nand_flash_ids[i].name == NULL)
236 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
237 static void DoC_ScanChips(struct DiskOnChip *this)
240 int numchips[MAX_FLOORS_MIL];
247 /* For each floor, find the number of valid chips it contains */
248 for (floor = 0,ret = 1; floor < MAX_FLOORS_MIL; floor++) {
250 for (chip = 0; chip < MAX_CHIPS_MIL && ret != 0; chip++) {
251 ret = DoC_IdentChip(this, floor, chip);
258 /* If there are none at all that we recognise, bail */
259 if (!this->numchips) {
260 printk("No flash chips recognised.\n");
264 /* Allocate an array to hold the information for each chip */
265 this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
267 printk("No memory for allocating chip info structures\n");
271 /* Fill out the chip array with {floor, chipno} for each
272 * detected chip in the device. */
273 for (floor = 0, ret = 0; floor < MAX_FLOORS_MIL; floor++) {
274 for (chip = 0 ; chip < numchips[floor] ; chip++) {
275 this->chips[ret].floor = floor;
276 this->chips[ret].chip = chip;
277 this->chips[ret].curadr = 0;
278 this->chips[ret].curmode = 0x50;
283 /* Calculate and print the total size of the device */
284 this->totlen = this->numchips * (1 << this->chipshift);
285 printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
286 this->numchips ,this->totlen >> 20);
289 static int DoCMil_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
291 int tmp1, tmp2, retval;
293 if (doc1->physadr == doc2->physadr)
296 /* Use the alias resolution register which was set aside for this
297 * purpose. If it's value is the same on both chips, they might
298 * be the same chip, and we write to one and check for a change in
299 * the other. It's unclear if this register is usuable in the
300 * DoC 2000 (it's in the Millenium docs), but it seems to work. */
301 tmp1 = ReadDOC(doc1->virtadr, AliasResolution);
302 tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
306 WriteDOC((tmp1+1) % 0xff, doc1->virtadr, AliasResolution);
307 tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
308 if (tmp2 == (tmp1+1) % 0xff)
313 /* Restore register contents. May not be necessary, but do it just to
315 WriteDOC(tmp1, doc1->virtadr, AliasResolution);
320 /* This routine is found from the docprobe code by symbol_get(),
321 * which will bump the use count of this module. */
322 void DoCMil_init(struct mtd_info *mtd)
324 struct DiskOnChip *this = mtd->priv;
325 struct DiskOnChip *old = NULL;
327 /* We must avoid being called twice for the same device. */
329 old = docmillist->priv;
332 if (DoCMil_is_alias(this, old)) {
333 printk(KERN_NOTICE "Ignoring DiskOnChip Millennium at "
334 "0x%lX - already configured\n", this->physadr);
335 iounmap(this->virtadr);
340 old = old->nextdoc->priv;
345 mtd->name = "DiskOnChip Millennium";
346 printk(KERN_NOTICE "DiskOnChip Millennium found at address 0x%lX\n",
349 mtd->type = MTD_NANDFLASH;
350 mtd->flags = MTD_CAP_NANDFLASH;
353 /* FIXME: erase size is not always 8KiB */
354 mtd->erasesize = 0x2000;
356 mtd->writesize = 512;
358 mtd->owner = THIS_MODULE;
359 mtd->erase = doc_erase;
362 mtd->read = doc_read;
363 mtd->write = doc_write;
364 mtd->read_oob = doc_read_oob;
365 mtd->write_oob = doc_write_oob;
373 /* Ident all the chips present. */
378 iounmap(this->virtadr);
380 this->nextdoc = docmillist;
382 mtd->size = this->totlen;
387 EXPORT_SYMBOL_GPL(DoCMil_init);
389 static int doc_read (struct mtd_info *mtd, loff_t from, size_t len,
390 size_t *retlen, u_char *buf)
394 unsigned char syndrome[6], eccbuf[6];
395 struct DiskOnChip *this = mtd->priv;
396 void __iomem *docptr = this->virtadr;
397 struct Nand *mychip = &this->chips[from >> (this->chipshift)];
399 /* Don't allow read past end of device */
400 if (from >= this->totlen)
403 /* Don't allow a single read to cross a 512-byte block boundary */
404 if (from + len > ((from | 0x1ff) + 1))
405 len = ((from | 0x1ff) + 1) - from;
407 /* Find the chip which is to be used and select it */
408 if (this->curfloor != mychip->floor) {
409 DoC_SelectFloor(docptr, mychip->floor);
410 DoC_SelectChip(docptr, mychip->chip);
411 } else if (this->curchip != mychip->chip) {
412 DoC_SelectChip(docptr, mychip->chip);
414 this->curfloor = mychip->floor;
415 this->curchip = mychip->chip;
417 /* issue the Read0 or Read1 command depend on which half of the page
418 we are accessing. Polling the Flash Ready bit after issue 3 bytes
419 address in Sequence Read Mode, see Software Requirement 11.4 item 1.*/
420 DoC_Command(docptr, (from >> 8) & 1, CDSN_CTRL_WP);
421 DoC_Address(docptr, 3, from, CDSN_CTRL_WP, 0x00);
422 DoC_WaitReady(docptr);
424 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
425 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
426 WriteDOC (DOC_ECC_EN, docptr, ECCConf);
428 /* Read the data via the internal pipeline through CDSN IO register,
429 see Pipelined Read Operations 11.3 */
430 dummy = ReadDOC(docptr, ReadPipeInit);
432 for (i = 0; i < len-1; i++) {
433 /* N.B. you have to increase the source address in this way or the
434 ECC logic will not work properly */
435 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff));
438 memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
440 buf[len - 1] = ReadDOC(docptr, LastDataRead);
442 /* Let the caller know we completed it */
446 /* Read the ECC data from Spare Data Area,
447 see Reed-Solomon EDC/ECC 11.1 */
448 dummy = ReadDOC(docptr, ReadPipeInit);
450 for (i = 0; i < 5; i++) {
451 /* N.B. you have to increase the source address in this way or the
452 ECC logic will not work properly */
453 eccbuf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
456 memcpy_fromio(eccbuf, docptr + DoC_Mil_CDSN_IO, 5);
458 eccbuf[5] = ReadDOC(docptr, LastDataRead);
460 /* Flush the pipeline */
461 dummy = ReadDOC(docptr, ECCConf);
462 dummy = ReadDOC(docptr, ECCConf);
464 /* Check the ECC Status */
465 if (ReadDOC(docptr, ECCConf) & 0x80) {
467 /* There was an ECC error */
469 printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
471 /* Read the ECC syndrom through the DiskOnChip ECC logic.
472 These syndrome will be all ZERO when there is no error */
473 for (i = 0; i < 6; i++) {
474 syndrome[i] = ReadDOC(docptr, ECCSyndrome0 + i);
476 nb_errors = doc_decode_ecc(buf, syndrome);
478 printk("ECC Errors corrected: %x\n", nb_errors);
481 /* We return error, but have actually done the read. Not that
482 this can be told to user-space, via sys_read(), but at least
483 MTD-aware stuff can know about it by checking *retlen */
489 printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
490 (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
491 eccbuf[4], eccbuf[5]);
494 /* disable the ECC engine */
495 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
500 static int doc_write (struct mtd_info *mtd, loff_t to, size_t len,
501 size_t *retlen, const u_char *buf)
506 struct DiskOnChip *this = mtd->priv;
507 void __iomem *docptr = this->virtadr;
508 struct Nand *mychip = &this->chips[to >> (this->chipshift)];
510 /* Don't allow write past end of device */
511 if (to >= this->totlen)
515 /* Don't allow a single write to cross a 512-byte block boundary */
516 if (to + len > ( (to | 0x1ff) + 1))
517 len = ((to | 0x1ff) + 1) - to;
519 /* Don't allow writes which aren't exactly one block */
520 if (to & 0x1ff || len != 0x200)
524 /* Find the chip which is to be used and select it */
525 if (this->curfloor != mychip->floor) {
526 DoC_SelectFloor(docptr, mychip->floor);
527 DoC_SelectChip(docptr, mychip->chip);
528 } else if (this->curchip != mychip->chip) {
529 DoC_SelectChip(docptr, mychip->chip);
531 this->curfloor = mychip->floor;
532 this->curchip = mychip->chip;
534 /* Reset the chip, see Software Requirement 11.4 item 1. */
535 DoC_Command(docptr, NAND_CMD_RESET, 0x00);
536 DoC_WaitReady(docptr);
537 /* Set device to main plane of flash */
538 DoC_Command(docptr, NAND_CMD_READ0, 0x00);
540 /* issue the Serial Data In command to initial the Page Program process */
541 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
542 DoC_Address(docptr, 3, to, 0x00, 0x00);
543 DoC_WaitReady(docptr);
545 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
546 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
547 WriteDOC (DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
549 /* Write the data via the internal pipeline through CDSN IO register,
550 see Pipelined Write Operations 11.2 */
552 for (i = 0; i < len; i++) {
553 /* N.B. you have to increase the source address in this way or the
554 ECC logic will not work properly */
555 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
558 memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
560 WriteDOC(0x00, docptr, WritePipeTerm);
562 /* Write ECC data to flash, the ECC info is generated by the DiskOnChip ECC logic
563 see Reed-Solomon EDC/ECC 11.1 */
564 WriteDOC(0, docptr, NOP);
565 WriteDOC(0, docptr, NOP);
566 WriteDOC(0, docptr, NOP);
568 /* Read the ECC data through the DiskOnChip ECC logic */
569 for (i = 0; i < 6; i++) {
570 eccbuf[i] = ReadDOC(docptr, ECCSyndrome0 + i);
573 /* ignore the ECC engine */
574 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
577 /* Write the ECC data to flash */
578 for (i = 0; i < 6; i++) {
579 /* N.B. you have to increase the source address in this way or the
580 ECC logic will not work properly */
581 WriteDOC(eccbuf[i], docptr, Mil_CDSN_IO + i);
584 memcpy_toio(docptr + DoC_Mil_CDSN_IO, eccbuf, 6);
587 /* write the block status BLOCK_USED (0x5555) at the end of ECC data
588 FIXME: this is only a hack for programming the IPL area for LinuxBIOS
589 and should be replace with proper codes in user space utilities */
590 WriteDOC(0x55, docptr, Mil_CDSN_IO);
591 WriteDOC(0x55, docptr, Mil_CDSN_IO + 1);
593 WriteDOC(0x00, docptr, WritePipeTerm);
596 printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
597 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
598 eccbuf[4], eccbuf[5]);
601 /* Commit the Page Program command and wait for ready
602 see Software Requirement 11.4 item 1.*/
603 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
604 DoC_WaitReady(docptr);
606 /* Read the status of the flash device through CDSN IO register
607 see Software Requirement 11.4 item 5.*/
608 DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
609 dummy = ReadDOC(docptr, ReadPipeInit);
610 DoC_Delay(docptr, 2);
611 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
612 printk("Error programming flash\n");
613 /* Error in programming
614 FIXME: implement Bad Block Replacement (in nftl.c ??) */
618 dummy = ReadDOC(docptr, LastDataRead);
620 /* Let the caller know we completed it */
626 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
627 struct mtd_oob_ops *ops)
633 struct DiskOnChip *this = mtd->priv;
634 void __iomem *docptr = this->virtadr;
635 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
636 uint8_t *buf = ops->oobbuf;
637 size_t len = ops->len;
639 BUG_ON(ops->mode != MTD_OOB_PLACE);
643 /* Find the chip which is to be used and select it */
644 if (this->curfloor != mychip->floor) {
645 DoC_SelectFloor(docptr, mychip->floor);
646 DoC_SelectChip(docptr, mychip->chip);
647 } else if (this->curchip != mychip->chip) {
648 DoC_SelectChip(docptr, mychip->chip);
650 this->curfloor = mychip->floor;
651 this->curchip = mychip->chip;
653 /* disable the ECC engine */
654 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
655 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
657 /* issue the Read2 command to set the pointer to the Spare Data Area.
658 Polling the Flash Ready bit after issue 3 bytes address in
659 Sequence Read Mode, see Software Requirement 11.4 item 1.*/
660 DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
661 DoC_Address(docptr, 3, ofs, CDSN_CTRL_WP, 0x00);
662 DoC_WaitReady(docptr);
664 /* Read the data out via the internal pipeline through CDSN IO register,
665 see Pipelined Read Operations 11.3 */
666 dummy = ReadDOC(docptr, ReadPipeInit);
668 for (i = 0; i < len-1; i++) {
669 /* N.B. you have to increase the source address in this way or the
670 ECC logic will not work properly */
671 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
674 memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
676 buf[len - 1] = ReadDOC(docptr, LastDataRead);
683 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
684 struct mtd_oob_ops *ops)
691 struct DiskOnChip *this = mtd->priv;
692 void __iomem *docptr = this->virtadr;
693 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
694 uint8_t *buf = ops->oobbuf;
695 size_t len = ops->len;
697 BUG_ON(ops->mode != MTD_OOB_PLACE);
701 /* Find the chip which is to be used and select it */
702 if (this->curfloor != mychip->floor) {
703 DoC_SelectFloor(docptr, mychip->floor);
704 DoC_SelectChip(docptr, mychip->chip);
705 } else if (this->curchip != mychip->chip) {
706 DoC_SelectChip(docptr, mychip->chip);
708 this->curfloor = mychip->floor;
709 this->curchip = mychip->chip;
711 /* disable the ECC engine */
712 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
713 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
715 /* Reset the chip, see Software Requirement 11.4 item 1. */
716 DoC_Command(docptr, NAND_CMD_RESET, CDSN_CTRL_WP);
717 DoC_WaitReady(docptr);
718 /* issue the Read2 command to set the pointer to the Spare Data Area. */
719 DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
721 /* issue the Serial Data In command to initial the Page Program process */
722 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
723 DoC_Address(docptr, 3, ofs, 0x00, 0x00);
725 /* Write the data via the internal pipeline through CDSN IO register,
726 see Pipelined Write Operations 11.2 */
728 for (i = 0; i < len; i++) {
729 /* N.B. you have to increase the source address in this way or the
730 ECC logic will not work properly */
731 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
734 memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
736 WriteDOC(0x00, docptr, WritePipeTerm);
738 /* Commit the Page Program command and wait for ready
739 see Software Requirement 11.4 item 1.*/
740 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
741 DoC_WaitReady(docptr);
743 /* Read the status of the flash device through CDSN IO register
744 see Software Requirement 11.4 item 5.*/
745 DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
746 dummy = ReadDOC(docptr, ReadPipeInit);
747 DoC_Delay(docptr, 2);
748 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
749 printk("Error programming oob data\n");
750 /* FIXME: implement Bad Block Replacement (in nftl.c ??) */
754 dummy = ReadDOC(docptr, LastDataRead);
761 int doc_erase (struct mtd_info *mtd, struct erase_info *instr)
764 struct DiskOnChip *this = mtd->priv;
765 __u32 ofs = instr->addr;
766 __u32 len = instr->len;
767 void __iomem *docptr = this->virtadr;
768 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
770 if (len != mtd->erasesize)
771 printk(KERN_WARNING "Erase not right size (%x != %x)n",
772 len, mtd->erasesize);
774 /* Find the chip which is to be used and select it */
775 if (this->curfloor != mychip->floor) {
776 DoC_SelectFloor(docptr, mychip->floor);
777 DoC_SelectChip(docptr, mychip->chip);
778 } else if (this->curchip != mychip->chip) {
779 DoC_SelectChip(docptr, mychip->chip);
781 this->curfloor = mychip->floor;
782 this->curchip = mychip->chip;
784 instr->state = MTD_ERASE_PENDING;
786 /* issue the Erase Setup command */
787 DoC_Command(docptr, NAND_CMD_ERASE1, 0x00);
788 DoC_Address(docptr, 2, ofs, 0x00, 0x00);
790 /* Commit the Erase Start command and wait for ready
791 see Software Requirement 11.4 item 1.*/
792 DoC_Command(docptr, NAND_CMD_ERASE2, 0x00);
793 DoC_WaitReady(docptr);
795 instr->state = MTD_ERASING;
797 /* Read the status of the flash device through CDSN IO register
798 see Software Requirement 11.4 item 5.
799 FIXME: it seems that we are not wait long enough, some blocks are not
801 DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
802 dummy = ReadDOC(docptr, ReadPipeInit);
803 DoC_Delay(docptr, 2);
804 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
805 printk("Error Erasing at 0x%x\n", ofs);
806 /* There was an error
807 FIXME: implement Bad Block Replacement (in nftl.c ??) */
808 instr->state = MTD_ERASE_FAILED;
810 instr->state = MTD_ERASE_DONE;
811 dummy = ReadDOC(docptr, LastDataRead);
813 mtd_erase_callback(instr);
818 /****************************************************************************
822 ****************************************************************************/
824 static void __exit cleanup_doc2001(void)
826 struct mtd_info *mtd;
827 struct DiskOnChip *this;
829 while ((mtd=docmillist)) {
831 docmillist = this->nextdoc;
835 iounmap(this->virtadr);
841 module_exit(cleanup_doc2001);
843 MODULE_LICENSE("GPL");
844 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
845 MODULE_DESCRIPTION("Alternative driver for DiskOnChip Millennium");