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/sched.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_ecc(struct mtd_info *mtd, loff_t from, size_t len,
41 size_t *retlen, u_char *buf, u_char *eccbuf,
42 struct nand_oobinfo *oobsel);
43 static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
44 size_t *retlen, const u_char *buf, u_char *eccbuf,
45 struct nand_oobinfo *oobsel);
46 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
47 struct mtd_oob_ops *ops);
48 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
49 struct mtd_oob_ops *ops);
50 static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
52 static struct mtd_info *docmillist = NULL;
54 /* Perform the required delay cycles by reading from the NOP register */
55 static void DoC_Delay(void __iomem * docptr, unsigned short cycles)
60 for (i = 0; i < cycles; i++)
61 dummy = ReadDOC(docptr, NOP);
64 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
65 static int _DoC_WaitReady(void __iomem * docptr)
67 unsigned short c = 0xffff;
69 DEBUG(MTD_DEBUG_LEVEL3,
70 "_DoC_WaitReady called for out-of-line wait\n");
72 /* Out-of-line routine to wait for chip response */
73 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B) && --c)
77 DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");
82 static inline int DoC_WaitReady(void __iomem * docptr)
84 /* This is inline, to optimise the common case, where it's ready instantly */
87 /* 4 read form NOP register should be issued in prior to the read from CDSNControl
88 see Software Requirement 11.4 item 2. */
91 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
92 /* Call the out-of-line routine to wait */
93 ret = _DoC_WaitReady(docptr);
95 /* issue 2 read from NOP register after reading from CDSNControl register
96 see Software Requirement 11.4 item 2. */
102 /* DoC_Command: Send a flash command to the flash chip through the CDSN IO register
103 with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
104 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
106 static void DoC_Command(void __iomem * docptr, unsigned char command,
107 unsigned char xtraflags)
109 /* Assert the CLE (Command Latch Enable) line to the flash chip */
110 WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
111 DoC_Delay(docptr, 4);
113 /* Send the command */
114 WriteDOC(command, docptr, Mil_CDSN_IO);
115 WriteDOC(0x00, docptr, WritePipeTerm);
117 /* Lower the CLE line */
118 WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
119 DoC_Delay(docptr, 4);
122 /* DoC_Address: Set the current address for the flash chip through the CDSN IO register
123 with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
124 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
126 static inline void DoC_Address(void __iomem * docptr, int numbytes, unsigned long ofs,
127 unsigned char xtraflags1, unsigned char xtraflags2)
129 /* Assert the ALE (Address Latch Enable) line to the flash chip */
130 WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
131 DoC_Delay(docptr, 4);
133 /* Send the address */
137 /* Send single byte, bits 0-7. */
138 WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
139 WriteDOC(0x00, docptr, WritePipeTerm);
142 /* Send bits 9-16 followed by 17-23 */
143 WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO);
144 WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
145 WriteDOC(0x00, docptr, WritePipeTerm);
148 /* Send 0-7, 9-16, then 17-23 */
149 WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
150 WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO);
151 WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
152 WriteDOC(0x00, docptr, WritePipeTerm);
158 /* Lower the ALE line */
159 WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, CDSNControl);
160 DoC_Delay(docptr, 4);
163 /* DoC_SelectChip: Select a given flash chip within the current floor */
164 static int DoC_SelectChip(void __iomem * docptr, int chip)
166 /* Select the individual flash chip requested */
167 WriteDOC(chip, docptr, CDSNDeviceSelect);
168 DoC_Delay(docptr, 4);
170 /* Wait for it to be ready */
171 return DoC_WaitReady(docptr);
174 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
175 static int DoC_SelectFloor(void __iomem * docptr, int floor)
177 /* Select the floor (bank) of chips required */
178 WriteDOC(floor, docptr, FloorSelect);
180 /* Wait for the chip to be ready */
181 return DoC_WaitReady(docptr);
184 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
185 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
190 /* Page in the required floor/chip
191 FIXME: is this supported by Millennium ?? */
192 DoC_SelectFloor(doc->virtadr, floor);
193 DoC_SelectChip(doc->virtadr, chip);
195 /* Reset the chip, see Software Requirement 11.4 item 1. */
196 DoC_Command(doc->virtadr, NAND_CMD_RESET, CDSN_CTRL_WP);
197 DoC_WaitReady(doc->virtadr);
199 /* Read the NAND chip ID: 1. Send ReadID command */
200 DoC_Command(doc->virtadr, NAND_CMD_READID, CDSN_CTRL_WP);
202 /* Read the NAND chip ID: 2. Send address byte zero */
203 DoC_Address(doc->virtadr, 1, 0x00, CDSN_CTRL_WP, 0x00);
205 /* Read the manufacturer and device id codes of the flash device through
206 CDSN IO register see Software Requirement 11.4 item 5.*/
207 dummy = ReadDOC(doc->virtadr, ReadPipeInit);
208 DoC_Delay(doc->virtadr, 2);
209 mfr = ReadDOC(doc->virtadr, Mil_CDSN_IO);
211 DoC_Delay(doc->virtadr, 2);
212 id = ReadDOC(doc->virtadr, Mil_CDSN_IO);
213 dummy = ReadDOC(doc->virtadr, LastDataRead);
215 /* No response - return failure */
216 if (mfr == 0xff || mfr == 0)
219 /* FIXME: to deal with multi-flash on multi-Millennium case more carefully */
220 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
221 if ( id == nand_flash_ids[i].id) {
222 /* Try to identify manufacturer */
223 for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
224 if (nand_manuf_ids[j].id == mfr)
227 printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
228 "Chip ID: %2.2X (%s:%s)\n",
229 mfr, id, nand_manuf_ids[j].name, nand_flash_ids[i].name);
232 doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
237 if (nand_flash_ids[i].name == NULL)
243 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
244 static void DoC_ScanChips(struct DiskOnChip *this)
247 int numchips[MAX_FLOORS_MIL];
254 /* For each floor, find the number of valid chips it contains */
255 for (floor = 0,ret = 1; floor < MAX_FLOORS_MIL; floor++) {
257 for (chip = 0; chip < MAX_CHIPS_MIL && ret != 0; chip++) {
258 ret = DoC_IdentChip(this, floor, chip);
265 /* If there are none at all that we recognise, bail */
266 if (!this->numchips) {
267 printk("No flash chips recognised.\n");
271 /* Allocate an array to hold the information for each chip */
272 this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
274 printk("No memory for allocating chip info structures\n");
278 /* Fill out the chip array with {floor, chipno} for each
279 * detected chip in the device. */
280 for (floor = 0, ret = 0; floor < MAX_FLOORS_MIL; floor++) {
281 for (chip = 0 ; chip < numchips[floor] ; chip++) {
282 this->chips[ret].floor = floor;
283 this->chips[ret].chip = chip;
284 this->chips[ret].curadr = 0;
285 this->chips[ret].curmode = 0x50;
290 /* Calculate and print the total size of the device */
291 this->totlen = this->numchips * (1 << this->chipshift);
292 printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
293 this->numchips ,this->totlen >> 20);
296 static int DoCMil_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
298 int tmp1, tmp2, retval;
300 if (doc1->physadr == doc2->physadr)
303 /* Use the alias resolution register which was set aside for this
304 * purpose. If it's value is the same on both chips, they might
305 * be the same chip, and we write to one and check for a change in
306 * the other. It's unclear if this register is usuable in the
307 * DoC 2000 (it's in the Millenium docs), but it seems to work. */
308 tmp1 = ReadDOC(doc1->virtadr, AliasResolution);
309 tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
313 WriteDOC((tmp1+1) % 0xff, doc1->virtadr, AliasResolution);
314 tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
315 if (tmp2 == (tmp1+1) % 0xff)
320 /* Restore register contents. May not be necessary, but do it just to
322 WriteDOC(tmp1, doc1->virtadr, AliasResolution);
327 /* This routine is found from the docprobe code by symbol_get(),
328 * which will bump the use count of this module. */
329 void DoCMil_init(struct mtd_info *mtd)
331 struct DiskOnChip *this = mtd->priv;
332 struct DiskOnChip *old = NULL;
334 /* We must avoid being called twice for the same device. */
336 old = docmillist->priv;
339 if (DoCMil_is_alias(this, old)) {
340 printk(KERN_NOTICE "Ignoring DiskOnChip Millennium at "
341 "0x%lX - already configured\n", this->physadr);
342 iounmap(this->virtadr);
347 old = old->nextdoc->priv;
352 mtd->name = "DiskOnChip Millennium";
353 printk(KERN_NOTICE "DiskOnChip Millennium found at address 0x%lX\n",
356 mtd->type = MTD_NANDFLASH;
357 mtd->flags = MTD_CAP_NANDFLASH;
358 mtd->ecctype = MTD_ECC_RS_DiskOnChip;
361 /* FIXME: erase size is not always 8KiB */
362 mtd->erasesize = 0x2000;
364 mtd->writesize = 512;
366 mtd->owner = THIS_MODULE;
367 mtd->erase = doc_erase;
370 mtd->read = doc_read;
371 mtd->write = doc_write;
372 mtd->read_oob = doc_read_oob;
373 mtd->write_oob = doc_write_oob;
381 /* Ident all the chips present. */
386 iounmap(this->virtadr);
388 this->nextdoc = docmillist;
390 mtd->size = this->totlen;
395 EXPORT_SYMBOL_GPL(DoCMil_init);
397 static int doc_read (struct mtd_info *mtd, loff_t from, size_t len,
398 size_t *retlen, u_char *buf)
400 /* Just a special case of doc_read_ecc */
401 return doc_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
404 static int doc_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,
405 size_t *retlen, u_char *buf, u_char *eccbuf,
406 struct nand_oobinfo *oobsel)
410 unsigned char syndrome[6];
411 struct DiskOnChip *this = mtd->priv;
412 void __iomem *docptr = this->virtadr;
413 struct Nand *mychip = &this->chips[from >> (this->chipshift)];
415 /* Don't allow read past end of device */
416 if (from >= this->totlen)
419 /* Don't allow a single read to cross a 512-byte block boundary */
420 if (from + len > ((from | 0x1ff) + 1))
421 len = ((from | 0x1ff) + 1) - from;
423 /* Find the chip which is to be used and select it */
424 if (this->curfloor != mychip->floor) {
425 DoC_SelectFloor(docptr, mychip->floor);
426 DoC_SelectChip(docptr, mychip->chip);
427 } else if (this->curchip != mychip->chip) {
428 DoC_SelectChip(docptr, mychip->chip);
430 this->curfloor = mychip->floor;
431 this->curchip = mychip->chip;
433 /* issue the Read0 or Read1 command depend on which half of the page
434 we are accessing. Polling the Flash Ready bit after issue 3 bytes
435 address in Sequence Read Mode, see Software Requirement 11.4 item 1.*/
436 DoC_Command(docptr, (from >> 8) & 1, CDSN_CTRL_WP);
437 DoC_Address(docptr, 3, from, CDSN_CTRL_WP, 0x00);
438 DoC_WaitReady(docptr);
441 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
442 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
443 WriteDOC (DOC_ECC_EN, docptr, ECCConf);
445 /* disable the ECC engine */
446 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
447 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
450 /* Read the data via the internal pipeline through CDSN IO register,
451 see Pipelined Read Operations 11.3 */
452 dummy = ReadDOC(docptr, ReadPipeInit);
454 for (i = 0; i < len-1; i++) {
455 /* N.B. you have to increase the source address in this way or the
456 ECC logic will not work properly */
457 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff));
460 memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
462 buf[len - 1] = ReadDOC(docptr, LastDataRead);
464 /* Let the caller know we completed it */
469 /* Read the ECC data from Spare Data Area,
470 see Reed-Solomon EDC/ECC 11.1 */
471 dummy = ReadDOC(docptr, ReadPipeInit);
473 for (i = 0; i < 5; i++) {
474 /* N.B. you have to increase the source address in this way or the
475 ECC logic will not work properly */
476 eccbuf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
479 memcpy_fromio(eccbuf, docptr + DoC_Mil_CDSN_IO, 5);
481 eccbuf[5] = ReadDOC(docptr, LastDataRead);
483 /* Flush the pipeline */
484 dummy = ReadDOC(docptr, ECCConf);
485 dummy = ReadDOC(docptr, ECCConf);
487 /* Check the ECC Status */
488 if (ReadDOC(docptr, ECCConf) & 0x80) {
490 /* There was an ECC error */
492 printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
494 /* Read the ECC syndrom through the DiskOnChip ECC logic.
495 These syndrome will be all ZERO when there is no error */
496 for (i = 0; i < 6; i++) {
497 syndrome[i] = ReadDOC(docptr, ECCSyndrome0 + i);
499 nb_errors = doc_decode_ecc(buf, syndrome);
501 printk("ECC Errors corrected: %x\n", nb_errors);
504 /* We return error, but have actually done the read. Not that
505 this can be told to user-space, via sys_read(), but at least
506 MTD-aware stuff can know about it by checking *retlen */
512 printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
513 (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
514 eccbuf[4], eccbuf[5]);
517 /* disable the ECC engine */
518 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
524 static int doc_write (struct mtd_info *mtd, loff_t to, size_t len,
525 size_t *retlen, const u_char *buf)
528 return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf, NULL);
531 static int doc_write_ecc (struct mtd_info *mtd, loff_t to, size_t len,
532 size_t *retlen, const u_char *buf, u_char *eccbuf,
533 struct nand_oobinfo *oobsel)
537 struct DiskOnChip *this = mtd->priv;
538 void __iomem *docptr = this->virtadr;
539 struct Nand *mychip = &this->chips[to >> (this->chipshift)];
541 /* Don't allow write past end of device */
542 if (to >= this->totlen)
546 /* Don't allow a single write to cross a 512-byte block boundary */
547 if (to + len > ( (to | 0x1ff) + 1))
548 len = ((to | 0x1ff) + 1) - to;
550 /* Don't allow writes which aren't exactly one block */
551 if (to & 0x1ff || len != 0x200)
555 /* Find the chip which is to be used and select it */
556 if (this->curfloor != mychip->floor) {
557 DoC_SelectFloor(docptr, mychip->floor);
558 DoC_SelectChip(docptr, mychip->chip);
559 } else if (this->curchip != mychip->chip) {
560 DoC_SelectChip(docptr, mychip->chip);
562 this->curfloor = mychip->floor;
563 this->curchip = mychip->chip;
565 /* Reset the chip, see Software Requirement 11.4 item 1. */
566 DoC_Command(docptr, NAND_CMD_RESET, 0x00);
567 DoC_WaitReady(docptr);
568 /* Set device to main plane of flash */
569 DoC_Command(docptr, NAND_CMD_READ0, 0x00);
571 /* issue the Serial Data In command to initial the Page Program process */
572 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
573 DoC_Address(docptr, 3, to, 0x00, 0x00);
574 DoC_WaitReady(docptr);
577 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
578 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
579 WriteDOC (DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
581 /* disable the ECC engine */
582 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
583 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
586 /* Write the data via the internal pipeline through CDSN IO register,
587 see Pipelined Write Operations 11.2 */
589 for (i = 0; i < len; i++) {
590 /* N.B. you have to increase the source address in this way or the
591 ECC logic will not work properly */
592 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
595 memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
597 WriteDOC(0x00, docptr, WritePipeTerm);
600 /* Write ECC data to flash, the ECC info is generated by the DiskOnChip ECC logic
601 see Reed-Solomon EDC/ECC 11.1 */
602 WriteDOC(0, docptr, NOP);
603 WriteDOC(0, docptr, NOP);
604 WriteDOC(0, docptr, NOP);
606 /* Read the ECC data through the DiskOnChip ECC logic */
607 for (i = 0; i < 6; i++) {
608 eccbuf[i] = ReadDOC(docptr, ECCSyndrome0 + i);
611 /* ignore the ECC engine */
612 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
615 /* Write the ECC data to flash */
616 for (i = 0; i < 6; i++) {
617 /* N.B. you have to increase the source address in this way or the
618 ECC logic will not work properly */
619 WriteDOC(eccbuf[i], docptr, Mil_CDSN_IO + i);
622 memcpy_toio(docptr + DoC_Mil_CDSN_IO, eccbuf, 6);
625 /* write the block status BLOCK_USED (0x5555) at the end of ECC data
626 FIXME: this is only a hack for programming the IPL area for LinuxBIOS
627 and should be replace with proper codes in user space utilities */
628 WriteDOC(0x55, docptr, Mil_CDSN_IO);
629 WriteDOC(0x55, docptr, Mil_CDSN_IO + 1);
631 WriteDOC(0x00, docptr, WritePipeTerm);
634 printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
635 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
636 eccbuf[4], eccbuf[5]);
640 /* Commit the Page Program command and wait for ready
641 see Software Requirement 11.4 item 1.*/
642 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
643 DoC_WaitReady(docptr);
645 /* Read the status of the flash device through CDSN IO register
646 see Software Requirement 11.4 item 5.*/
647 DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
648 dummy = ReadDOC(docptr, ReadPipeInit);
649 DoC_Delay(docptr, 2);
650 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
651 printk("Error programming flash\n");
652 /* Error in programming
653 FIXME: implement Bad Block Replacement (in nftl.c ??) */
657 dummy = ReadDOC(docptr, LastDataRead);
659 /* Let the caller know we completed it */
665 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
666 struct mtd_oob_ops *ops)
672 struct DiskOnChip *this = mtd->priv;
673 void __iomem *docptr = this->virtadr;
674 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
675 uint8_t *buf = ops->oobbuf;
676 size_t len = ops->len;
678 BUG_ON(ops->mode != MTD_OOB_PLACE);
682 /* Find the chip which is to be used and select it */
683 if (this->curfloor != mychip->floor) {
684 DoC_SelectFloor(docptr, mychip->floor);
685 DoC_SelectChip(docptr, mychip->chip);
686 } else if (this->curchip != mychip->chip) {
687 DoC_SelectChip(docptr, mychip->chip);
689 this->curfloor = mychip->floor;
690 this->curchip = mychip->chip;
692 /* disable the ECC engine */
693 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
694 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
696 /* issue the Read2 command to set the pointer to the Spare Data Area.
697 Polling the Flash Ready bit after issue 3 bytes address in
698 Sequence Read Mode, see Software Requirement 11.4 item 1.*/
699 DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
700 DoC_Address(docptr, 3, ofs, CDSN_CTRL_WP, 0x00);
701 DoC_WaitReady(docptr);
703 /* Read the data out via the internal pipeline through CDSN IO register,
704 see Pipelined Read Operations 11.3 */
705 dummy = ReadDOC(docptr, ReadPipeInit);
707 for (i = 0; i < len-1; i++) {
708 /* N.B. you have to increase the source address in this way or the
709 ECC logic will not work properly */
710 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
713 memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
715 buf[len - 1] = ReadDOC(docptr, LastDataRead);
722 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
723 struct mtd_oob_ops *ops)
730 struct DiskOnChip *this = mtd->priv;
731 void __iomem *docptr = this->virtadr;
732 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
733 uint8_t *buf = ops->oobbuf;
734 size_t len = ops->len;
736 BUG_ON(ops->mode != MTD_OOB_PLACE);
740 /* Find the chip which is to be used and select it */
741 if (this->curfloor != mychip->floor) {
742 DoC_SelectFloor(docptr, mychip->floor);
743 DoC_SelectChip(docptr, mychip->chip);
744 } else if (this->curchip != mychip->chip) {
745 DoC_SelectChip(docptr, mychip->chip);
747 this->curfloor = mychip->floor;
748 this->curchip = mychip->chip;
750 /* disable the ECC engine */
751 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
752 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
754 /* Reset the chip, see Software Requirement 11.4 item 1. */
755 DoC_Command(docptr, NAND_CMD_RESET, CDSN_CTRL_WP);
756 DoC_WaitReady(docptr);
757 /* issue the Read2 command to set the pointer to the Spare Data Area. */
758 DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
760 /* issue the Serial Data In command to initial the Page Program process */
761 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
762 DoC_Address(docptr, 3, ofs, 0x00, 0x00);
764 /* Write the data via the internal pipeline through CDSN IO register,
765 see Pipelined Write Operations 11.2 */
767 for (i = 0; i < len; i++) {
768 /* N.B. you have to increase the source address in this way or the
769 ECC logic will not work properly */
770 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
773 memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
775 WriteDOC(0x00, docptr, WritePipeTerm);
777 /* Commit the Page Program command and wait for ready
778 see Software Requirement 11.4 item 1.*/
779 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
780 DoC_WaitReady(docptr);
782 /* Read the status of the flash device through CDSN IO register
783 see Software Requirement 11.4 item 5.*/
784 DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
785 dummy = ReadDOC(docptr, ReadPipeInit);
786 DoC_Delay(docptr, 2);
787 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
788 printk("Error programming oob data\n");
789 /* FIXME: implement Bad Block Replacement (in nftl.c ??) */
793 dummy = ReadDOC(docptr, LastDataRead);
800 int doc_erase (struct mtd_info *mtd, struct erase_info *instr)
803 struct DiskOnChip *this = mtd->priv;
804 __u32 ofs = instr->addr;
805 __u32 len = instr->len;
806 void __iomem *docptr = this->virtadr;
807 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
809 if (len != mtd->erasesize)
810 printk(KERN_WARNING "Erase not right size (%x != %x)n",
811 len, mtd->erasesize);
813 /* Find the chip which is to be used and select it */
814 if (this->curfloor != mychip->floor) {
815 DoC_SelectFloor(docptr, mychip->floor);
816 DoC_SelectChip(docptr, mychip->chip);
817 } else if (this->curchip != mychip->chip) {
818 DoC_SelectChip(docptr, mychip->chip);
820 this->curfloor = mychip->floor;
821 this->curchip = mychip->chip;
823 instr->state = MTD_ERASE_PENDING;
825 /* issue the Erase Setup command */
826 DoC_Command(docptr, NAND_CMD_ERASE1, 0x00);
827 DoC_Address(docptr, 2, ofs, 0x00, 0x00);
829 /* Commit the Erase Start command and wait for ready
830 see Software Requirement 11.4 item 1.*/
831 DoC_Command(docptr, NAND_CMD_ERASE2, 0x00);
832 DoC_WaitReady(docptr);
834 instr->state = MTD_ERASING;
836 /* Read the status of the flash device through CDSN IO register
837 see Software Requirement 11.4 item 5.
838 FIXME: it seems that we are not wait long enough, some blocks are not
840 DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
841 dummy = ReadDOC(docptr, ReadPipeInit);
842 DoC_Delay(docptr, 2);
843 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
844 printk("Error Erasing at 0x%x\n", ofs);
845 /* There was an error
846 FIXME: implement Bad Block Replacement (in nftl.c ??) */
847 instr->state = MTD_ERASE_FAILED;
849 instr->state = MTD_ERASE_DONE;
850 dummy = ReadDOC(docptr, LastDataRead);
852 mtd_erase_callback(instr);
857 /****************************************************************************
861 ****************************************************************************/
863 static void __exit cleanup_doc2001(void)
865 struct mtd_info *mtd;
866 struct DiskOnChip *this;
868 while ((mtd=docmillist)) {
870 docmillist = this->nextdoc;
874 iounmap(this->virtadr);
880 module_exit(cleanup_doc2001);
882 MODULE_LICENSE("GPL");
883 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
884 MODULE_DESCRIPTION("Alternative driver for DiskOnChip Millennium");