lib: make percpu_counter_add take s64
[linux-2.6/linux-2.6-openrd.git] / drivers / mtd / devices / doc2001.c
blob6413efc045e0c98e1e657229fdbdd55e67671b1d
2 /*
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 $
8 */
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <asm/errno.h>
13 #include <asm/io.h>
14 #include <asm/uaccess.h>
15 #include <linux/miscdevice.h>
16 #include <linux/delay.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/types.h>
20 #include <linux/bitops.h>
22 #include <linux/mtd/mtd.h>
23 #include <linux/mtd/nand.h>
24 #include <linux/mtd/doc2000.h>
26 /* #define ECC_DEBUG */
28 /* I have no idea why some DoC chips can not use memcop_form|to_io().
29 * This may be due to the different revisions of the ASIC controller built-in or
30 * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment
31 * this:*/
32 #undef USE_MEMCPY
34 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
35 size_t *retlen, u_char *buf);
36 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
37 size_t *retlen, const u_char *buf);
38 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
39 struct mtd_oob_ops *ops);
40 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
41 struct mtd_oob_ops *ops);
42 static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
44 static struct mtd_info *docmillist = NULL;
46 /* Perform the required delay cycles by reading from the NOP register */
47 static void DoC_Delay(void __iomem * docptr, unsigned short cycles)
49 volatile char dummy;
50 int i;
52 for (i = 0; i < cycles; i++)
53 dummy = ReadDOC(docptr, NOP);
56 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
57 static int _DoC_WaitReady(void __iomem * docptr)
59 unsigned short c = 0xffff;
61 DEBUG(MTD_DEBUG_LEVEL3,
62 "_DoC_WaitReady called for out-of-line wait\n");
64 /* Out-of-line routine to wait for chip response */
65 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B) && --c)
68 if (c == 0)
69 DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");
71 return (c == 0);
74 static inline int DoC_WaitReady(void __iomem * docptr)
76 /* This is inline, to optimise the common case, where it's ready instantly */
77 int ret = 0;
79 /* 4 read form NOP register should be issued in prior to the read from CDSNControl
80 see Software Requirement 11.4 item 2. */
81 DoC_Delay(docptr, 4);
83 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
84 /* Call the out-of-line routine to wait */
85 ret = _DoC_WaitReady(docptr);
87 /* issue 2 read from NOP register after reading from CDSNControl register
88 see Software Requirement 11.4 item 2. */
89 DoC_Delay(docptr, 2);
91 return ret;
94 /* DoC_Command: Send a flash command to the flash chip through the CDSN IO register
95 with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
96 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
98 static void DoC_Command(void __iomem * docptr, unsigned char command,
99 unsigned char xtraflags)
101 /* Assert the CLE (Command Latch Enable) line to the flash chip */
102 WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
103 DoC_Delay(docptr, 4);
105 /* Send the command */
106 WriteDOC(command, docptr, Mil_CDSN_IO);
107 WriteDOC(0x00, docptr, WritePipeTerm);
109 /* Lower the CLE line */
110 WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
111 DoC_Delay(docptr, 4);
114 /* DoC_Address: Set the current address for the flash chip through the CDSN IO register
115 with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
116 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
118 static inline void DoC_Address(void __iomem * docptr, int numbytes, unsigned long ofs,
119 unsigned char xtraflags1, unsigned char xtraflags2)
121 /* Assert the ALE (Address Latch Enable) line to the flash chip */
122 WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
123 DoC_Delay(docptr, 4);
125 /* Send the address */
126 switch (numbytes)
128 case 1:
129 /* Send single byte, bits 0-7. */
130 WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
131 WriteDOC(0x00, docptr, WritePipeTerm);
132 break;
133 case 2:
134 /* Send bits 9-16 followed by 17-23 */
135 WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO);
136 WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
137 WriteDOC(0x00, docptr, WritePipeTerm);
138 break;
139 case 3:
140 /* Send 0-7, 9-16, then 17-23 */
141 WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
142 WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO);
143 WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
144 WriteDOC(0x00, docptr, WritePipeTerm);
145 break;
146 default:
147 return;
150 /* Lower the ALE line */
151 WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, CDSNControl);
152 DoC_Delay(docptr, 4);
155 /* DoC_SelectChip: Select a given flash chip within the current floor */
156 static int DoC_SelectChip(void __iomem * docptr, int chip)
158 /* Select the individual flash chip requested */
159 WriteDOC(chip, docptr, CDSNDeviceSelect);
160 DoC_Delay(docptr, 4);
162 /* Wait for it to be ready */
163 return DoC_WaitReady(docptr);
166 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
167 static int DoC_SelectFloor(void __iomem * docptr, int floor)
169 /* Select the floor (bank) of chips required */
170 WriteDOC(floor, docptr, FloorSelect);
172 /* Wait for the chip to be ready */
173 return DoC_WaitReady(docptr);
176 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
177 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
179 int mfr, id, i, j;
180 volatile char dummy;
182 /* Page in the required floor/chip
183 FIXME: is this supported by Millennium ?? */
184 DoC_SelectFloor(doc->virtadr, floor);
185 DoC_SelectChip(doc->virtadr, chip);
187 /* Reset the chip, see Software Requirement 11.4 item 1. */
188 DoC_Command(doc->virtadr, NAND_CMD_RESET, CDSN_CTRL_WP);
189 DoC_WaitReady(doc->virtadr);
191 /* Read the NAND chip ID: 1. Send ReadID command */
192 DoC_Command(doc->virtadr, NAND_CMD_READID, CDSN_CTRL_WP);
194 /* Read the NAND chip ID: 2. Send address byte zero */
195 DoC_Address(doc->virtadr, 1, 0x00, CDSN_CTRL_WP, 0x00);
197 /* Read the manufacturer and device id codes of the flash device through
198 CDSN IO register see Software Requirement 11.4 item 5.*/
199 dummy = ReadDOC(doc->virtadr, ReadPipeInit);
200 DoC_Delay(doc->virtadr, 2);
201 mfr = ReadDOC(doc->virtadr, Mil_CDSN_IO);
203 DoC_Delay(doc->virtadr, 2);
204 id = ReadDOC(doc->virtadr, Mil_CDSN_IO);
205 dummy = ReadDOC(doc->virtadr, LastDataRead);
207 /* No response - return failure */
208 if (mfr == 0xff || mfr == 0)
209 return 0;
211 /* FIXME: to deal with multi-flash on multi-Millennium case more carefully */
212 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
213 if ( id == nand_flash_ids[i].id) {
214 /* Try to identify manufacturer */
215 for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
216 if (nand_manuf_ids[j].id == mfr)
217 break;
219 printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
220 "Chip ID: %2.2X (%s:%s)\n",
221 mfr, id, nand_manuf_ids[j].name, nand_flash_ids[i].name);
222 doc->mfr = mfr;
223 doc->id = id;
224 doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
225 break;
229 if (nand_flash_ids[i].name == NULL)
230 return 0;
231 else
232 return 1;
235 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
236 static void DoC_ScanChips(struct DiskOnChip *this)
238 int floor, chip;
239 int numchips[MAX_FLOORS_MIL];
240 int ret;
242 this->numchips = 0;
243 this->mfr = 0;
244 this->id = 0;
246 /* For each floor, find the number of valid chips it contains */
247 for (floor = 0,ret = 1; floor < MAX_FLOORS_MIL; floor++) {
248 numchips[floor] = 0;
249 for (chip = 0; chip < MAX_CHIPS_MIL && ret != 0; chip++) {
250 ret = DoC_IdentChip(this, floor, chip);
251 if (ret) {
252 numchips[floor]++;
253 this->numchips++;
257 /* If there are none at all that we recognise, bail */
258 if (!this->numchips) {
259 printk("No flash chips recognised.\n");
260 return;
263 /* Allocate an array to hold the information for each chip */
264 this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
265 if (!this->chips){
266 printk("No memory for allocating chip info structures\n");
267 return;
270 /* Fill out the chip array with {floor, chipno} for each
271 * detected chip in the device. */
272 for (floor = 0, ret = 0; floor < MAX_FLOORS_MIL; floor++) {
273 for (chip = 0 ; chip < numchips[floor] ; chip++) {
274 this->chips[ret].floor = floor;
275 this->chips[ret].chip = chip;
276 this->chips[ret].curadr = 0;
277 this->chips[ret].curmode = 0x50;
278 ret++;
282 /* Calculate and print the total size of the device */
283 this->totlen = this->numchips * (1 << this->chipshift);
284 printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
285 this->numchips ,this->totlen >> 20);
288 static int DoCMil_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
290 int tmp1, tmp2, retval;
292 if (doc1->physadr == doc2->physadr)
293 return 1;
295 /* Use the alias resolution register which was set aside for this
296 * purpose. If it's value is the same on both chips, they might
297 * be the same chip, and we write to one and check for a change in
298 * the other. It's unclear if this register is usuable in the
299 * DoC 2000 (it's in the Millenium docs), but it seems to work. */
300 tmp1 = ReadDOC(doc1->virtadr, AliasResolution);
301 tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
302 if (tmp1 != tmp2)
303 return 0;
305 WriteDOC((tmp1+1) % 0xff, doc1->virtadr, AliasResolution);
306 tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
307 if (tmp2 == (tmp1+1) % 0xff)
308 retval = 1;
309 else
310 retval = 0;
312 /* Restore register contents. May not be necessary, but do it just to
313 * be safe. */
314 WriteDOC(tmp1, doc1->virtadr, AliasResolution);
316 return retval;
319 /* This routine is found from the docprobe code by symbol_get(),
320 * which will bump the use count of this module. */
321 void DoCMil_init(struct mtd_info *mtd)
323 struct DiskOnChip *this = mtd->priv;
324 struct DiskOnChip *old = NULL;
326 /* We must avoid being called twice for the same device. */
327 if (docmillist)
328 old = docmillist->priv;
330 while (old) {
331 if (DoCMil_is_alias(this, old)) {
332 printk(KERN_NOTICE "Ignoring DiskOnChip Millennium at "
333 "0x%lX - already configured\n", this->physadr);
334 iounmap(this->virtadr);
335 kfree(mtd);
336 return;
338 if (old->nextdoc)
339 old = old->nextdoc->priv;
340 else
341 old = NULL;
344 mtd->name = "DiskOnChip Millennium";
345 printk(KERN_NOTICE "DiskOnChip Millennium found at address 0x%lX\n",
346 this->physadr);
348 mtd->type = MTD_NANDFLASH;
349 mtd->flags = MTD_CAP_NANDFLASH;
350 mtd->size = 0;
352 /* FIXME: erase size is not always 8KiB */
353 mtd->erasesize = 0x2000;
355 mtd->writesize = 512;
356 mtd->oobsize = 16;
357 mtd->owner = THIS_MODULE;
358 mtd->erase = doc_erase;
359 mtd->point = NULL;
360 mtd->unpoint = NULL;
361 mtd->read = doc_read;
362 mtd->write = doc_write;
363 mtd->read_oob = doc_read_oob;
364 mtd->write_oob = doc_write_oob;
365 mtd->sync = NULL;
367 this->totlen = 0;
368 this->numchips = 0;
369 this->curfloor = -1;
370 this->curchip = -1;
372 /* Ident all the chips present. */
373 DoC_ScanChips(this);
375 if (!this->totlen) {
376 kfree(mtd);
377 iounmap(this->virtadr);
378 } else {
379 this->nextdoc = docmillist;
380 docmillist = mtd;
381 mtd->size = this->totlen;
382 add_mtd_device(mtd);
383 return;
386 EXPORT_SYMBOL_GPL(DoCMil_init);
388 static int doc_read (struct mtd_info *mtd, loff_t from, size_t len,
389 size_t *retlen, u_char *buf)
391 int i, ret;
392 volatile char dummy;
393 unsigned char syndrome[6], eccbuf[6];
394 struct DiskOnChip *this = mtd->priv;
395 void __iomem *docptr = this->virtadr;
396 struct Nand *mychip = &this->chips[from >> (this->chipshift)];
398 /* Don't allow read past end of device */
399 if (from >= this->totlen)
400 return -EINVAL;
402 /* Don't allow a single read to cross a 512-byte block boundary */
403 if (from + len > ((from | 0x1ff) + 1))
404 len = ((from | 0x1ff) + 1) - from;
406 /* Find the chip which is to be used and select it */
407 if (this->curfloor != mychip->floor) {
408 DoC_SelectFloor(docptr, mychip->floor);
409 DoC_SelectChip(docptr, mychip->chip);
410 } else if (this->curchip != mychip->chip) {
411 DoC_SelectChip(docptr, mychip->chip);
413 this->curfloor = mychip->floor;
414 this->curchip = mychip->chip;
416 /* issue the Read0 or Read1 command depend on which half of the page
417 we are accessing. Polling the Flash Ready bit after issue 3 bytes
418 address in Sequence Read Mode, see Software Requirement 11.4 item 1.*/
419 DoC_Command(docptr, (from >> 8) & 1, CDSN_CTRL_WP);
420 DoC_Address(docptr, 3, from, CDSN_CTRL_WP, 0x00);
421 DoC_WaitReady(docptr);
423 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
424 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
425 WriteDOC (DOC_ECC_EN, docptr, ECCConf);
427 /* Read the data via the internal pipeline through CDSN IO register,
428 see Pipelined Read Operations 11.3 */
429 dummy = ReadDOC(docptr, ReadPipeInit);
430 #ifndef USE_MEMCPY
431 for (i = 0; i < len-1; i++) {
432 /* N.B. you have to increase the source address in this way or the
433 ECC logic will not work properly */
434 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff));
436 #else
437 memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
438 #endif
439 buf[len - 1] = ReadDOC(docptr, LastDataRead);
441 /* Let the caller know we completed it */
442 *retlen = len;
443 ret = 0;
445 /* Read the ECC data from Spare Data Area,
446 see Reed-Solomon EDC/ECC 11.1 */
447 dummy = ReadDOC(docptr, ReadPipeInit);
448 #ifndef USE_MEMCPY
449 for (i = 0; i < 5; i++) {
450 /* N.B. you have to increase the source address in this way or the
451 ECC logic will not work properly */
452 eccbuf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
454 #else
455 memcpy_fromio(eccbuf, docptr + DoC_Mil_CDSN_IO, 5);
456 #endif
457 eccbuf[5] = ReadDOC(docptr, LastDataRead);
459 /* Flush the pipeline */
460 dummy = ReadDOC(docptr, ECCConf);
461 dummy = ReadDOC(docptr, ECCConf);
463 /* Check the ECC Status */
464 if (ReadDOC(docptr, ECCConf) & 0x80) {
465 int nb_errors;
466 /* There was an ECC error */
467 #ifdef ECC_DEBUG
468 printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
469 #endif
470 /* Read the ECC syndrom through the DiskOnChip ECC logic.
471 These syndrome will be all ZERO when there is no error */
472 for (i = 0; i < 6; i++) {
473 syndrome[i] = ReadDOC(docptr, ECCSyndrome0 + i);
475 nb_errors = doc_decode_ecc(buf, syndrome);
476 #ifdef ECC_DEBUG
477 printk("ECC Errors corrected: %x\n", nb_errors);
478 #endif
479 if (nb_errors < 0) {
480 /* We return error, but have actually done the read. Not that
481 this can be told to user-space, via sys_read(), but at least
482 MTD-aware stuff can know about it by checking *retlen */
483 ret = -EIO;
487 #ifdef PSYCHO_DEBUG
488 printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
489 (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
490 eccbuf[4], eccbuf[5]);
491 #endif
493 /* disable the ECC engine */
494 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
496 return ret;
499 static int doc_write (struct mtd_info *mtd, loff_t to, size_t len,
500 size_t *retlen, const u_char *buf)
502 int i,ret = 0;
503 char eccbuf[6];
504 volatile char dummy;
505 struct DiskOnChip *this = mtd->priv;
506 void __iomem *docptr = this->virtadr;
507 struct Nand *mychip = &this->chips[to >> (this->chipshift)];
509 /* Don't allow write past end of device */
510 if (to >= this->totlen)
511 return -EINVAL;
513 #if 0
514 /* Don't allow a single write to cross a 512-byte block boundary */
515 if (to + len > ( (to | 0x1ff) + 1))
516 len = ((to | 0x1ff) + 1) - to;
517 #else
518 /* Don't allow writes which aren't exactly one block */
519 if (to & 0x1ff || len != 0x200)
520 return -EINVAL;
521 #endif
523 /* Find the chip which is to be used and select it */
524 if (this->curfloor != mychip->floor) {
525 DoC_SelectFloor(docptr, mychip->floor);
526 DoC_SelectChip(docptr, mychip->chip);
527 } else if (this->curchip != mychip->chip) {
528 DoC_SelectChip(docptr, mychip->chip);
530 this->curfloor = mychip->floor;
531 this->curchip = mychip->chip;
533 /* Reset the chip, see Software Requirement 11.4 item 1. */
534 DoC_Command(docptr, NAND_CMD_RESET, 0x00);
535 DoC_WaitReady(docptr);
536 /* Set device to main plane of flash */
537 DoC_Command(docptr, NAND_CMD_READ0, 0x00);
539 /* issue the Serial Data In command to initial the Page Program process */
540 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
541 DoC_Address(docptr, 3, to, 0x00, 0x00);
542 DoC_WaitReady(docptr);
544 /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
545 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
546 WriteDOC (DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
548 /* Write the data via the internal pipeline through CDSN IO register,
549 see Pipelined Write Operations 11.2 */
550 #ifndef USE_MEMCPY
551 for (i = 0; i < len; i++) {
552 /* N.B. you have to increase the source address in this way or the
553 ECC logic will not work properly */
554 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
556 #else
557 memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
558 #endif
559 WriteDOC(0x00, docptr, WritePipeTerm);
561 /* Write ECC data to flash, the ECC info is generated by the DiskOnChip ECC logic
562 see Reed-Solomon EDC/ECC 11.1 */
563 WriteDOC(0, docptr, NOP);
564 WriteDOC(0, docptr, NOP);
565 WriteDOC(0, docptr, NOP);
567 /* Read the ECC data through the DiskOnChip ECC logic */
568 for (i = 0; i < 6; i++) {
569 eccbuf[i] = ReadDOC(docptr, ECCSyndrome0 + i);
572 /* ignore the ECC engine */
573 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
575 #ifndef USE_MEMCPY
576 /* Write the ECC data to flash */
577 for (i = 0; i < 6; i++) {
578 /* N.B. you have to increase the source address in this way or the
579 ECC logic will not work properly */
580 WriteDOC(eccbuf[i], docptr, Mil_CDSN_IO + i);
582 #else
583 memcpy_toio(docptr + DoC_Mil_CDSN_IO, eccbuf, 6);
584 #endif
586 /* write the block status BLOCK_USED (0x5555) at the end of ECC data
587 FIXME: this is only a hack for programming the IPL area for LinuxBIOS
588 and should be replace with proper codes in user space utilities */
589 WriteDOC(0x55, docptr, Mil_CDSN_IO);
590 WriteDOC(0x55, docptr, Mil_CDSN_IO + 1);
592 WriteDOC(0x00, docptr, WritePipeTerm);
594 #ifdef PSYCHO_DEBUG
595 printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
596 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
597 eccbuf[4], eccbuf[5]);
598 #endif
600 /* Commit the Page Program command and wait for ready
601 see Software Requirement 11.4 item 1.*/
602 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
603 DoC_WaitReady(docptr);
605 /* Read the status of the flash device through CDSN IO register
606 see Software Requirement 11.4 item 5.*/
607 DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
608 dummy = ReadDOC(docptr, ReadPipeInit);
609 DoC_Delay(docptr, 2);
610 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
611 printk("Error programming flash\n");
612 /* Error in programming
613 FIXME: implement Bad Block Replacement (in nftl.c ??) */
614 *retlen = 0;
615 ret = -EIO;
617 dummy = ReadDOC(docptr, LastDataRead);
619 /* Let the caller know we completed it */
620 *retlen = len;
622 return ret;
625 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
626 struct mtd_oob_ops *ops)
628 #ifndef USE_MEMCPY
629 int i;
630 #endif
631 volatile char dummy;
632 struct DiskOnChip *this = mtd->priv;
633 void __iomem *docptr = this->virtadr;
634 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
635 uint8_t *buf = ops->oobbuf;
636 size_t len = ops->len;
638 BUG_ON(ops->mode != MTD_OOB_PLACE);
640 ofs += ops->ooboffs;
642 /* Find the chip which is to be used and select it */
643 if (this->curfloor != mychip->floor) {
644 DoC_SelectFloor(docptr, mychip->floor);
645 DoC_SelectChip(docptr, mychip->chip);
646 } else if (this->curchip != mychip->chip) {
647 DoC_SelectChip(docptr, mychip->chip);
649 this->curfloor = mychip->floor;
650 this->curchip = mychip->chip;
652 /* disable the ECC engine */
653 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
654 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
656 /* issue the Read2 command to set the pointer to the Spare Data Area.
657 Polling the Flash Ready bit after issue 3 bytes address in
658 Sequence Read Mode, see Software Requirement 11.4 item 1.*/
659 DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
660 DoC_Address(docptr, 3, ofs, CDSN_CTRL_WP, 0x00);
661 DoC_WaitReady(docptr);
663 /* Read the data out via the internal pipeline through CDSN IO register,
664 see Pipelined Read Operations 11.3 */
665 dummy = ReadDOC(docptr, ReadPipeInit);
666 #ifndef USE_MEMCPY
667 for (i = 0; i < len-1; i++) {
668 /* N.B. you have to increase the source address in this way or the
669 ECC logic will not work properly */
670 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
672 #else
673 memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
674 #endif
675 buf[len - 1] = ReadDOC(docptr, LastDataRead);
677 ops->retlen = len;
679 return 0;
682 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
683 struct mtd_oob_ops *ops)
685 #ifndef USE_MEMCPY
686 int i;
687 #endif
688 volatile char dummy;
689 int ret = 0;
690 struct DiskOnChip *this = mtd->priv;
691 void __iomem *docptr = this->virtadr;
692 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
693 uint8_t *buf = ops->oobbuf;
694 size_t len = ops->len;
696 BUG_ON(ops->mode != MTD_OOB_PLACE);
698 ofs += ops->ooboffs;
700 /* Find the chip which is to be used and select it */
701 if (this->curfloor != mychip->floor) {
702 DoC_SelectFloor(docptr, mychip->floor);
703 DoC_SelectChip(docptr, mychip->chip);
704 } else if (this->curchip != mychip->chip) {
705 DoC_SelectChip(docptr, mychip->chip);
707 this->curfloor = mychip->floor;
708 this->curchip = mychip->chip;
710 /* disable the ECC engine */
711 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
712 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
714 /* Reset the chip, see Software Requirement 11.4 item 1. */
715 DoC_Command(docptr, NAND_CMD_RESET, CDSN_CTRL_WP);
716 DoC_WaitReady(docptr);
717 /* issue the Read2 command to set the pointer to the Spare Data Area. */
718 DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
720 /* issue the Serial Data In command to initial the Page Program process */
721 DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
722 DoC_Address(docptr, 3, ofs, 0x00, 0x00);
724 /* Write the data via the internal pipeline through CDSN IO register,
725 see Pipelined Write Operations 11.2 */
726 #ifndef USE_MEMCPY
727 for (i = 0; i < len; i++) {
728 /* N.B. you have to increase the source address in this way or the
729 ECC logic will not work properly */
730 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
732 #else
733 memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
734 #endif
735 WriteDOC(0x00, docptr, WritePipeTerm);
737 /* Commit the Page Program command and wait for ready
738 see Software Requirement 11.4 item 1.*/
739 DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
740 DoC_WaitReady(docptr);
742 /* Read the status of the flash device through CDSN IO register
743 see Software Requirement 11.4 item 5.*/
744 DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
745 dummy = ReadDOC(docptr, ReadPipeInit);
746 DoC_Delay(docptr, 2);
747 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
748 printk("Error programming oob data\n");
749 /* FIXME: implement Bad Block Replacement (in nftl.c ??) */
750 ops->retlen = 0;
751 ret = -EIO;
753 dummy = ReadDOC(docptr, LastDataRead);
755 ops->retlen = len;
757 return ret;
760 int doc_erase (struct mtd_info *mtd, struct erase_info *instr)
762 volatile char dummy;
763 struct DiskOnChip *this = mtd->priv;
764 __u32 ofs = instr->addr;
765 __u32 len = instr->len;
766 void __iomem *docptr = this->virtadr;
767 struct Nand *mychip = &this->chips[ofs >> this->chipshift];
769 if (len != mtd->erasesize)
770 printk(KERN_WARNING "Erase not right size (%x != %x)n",
771 len, mtd->erasesize);
773 /* Find the chip which is to be used and select it */
774 if (this->curfloor != mychip->floor) {
775 DoC_SelectFloor(docptr, mychip->floor);
776 DoC_SelectChip(docptr, mychip->chip);
777 } else if (this->curchip != mychip->chip) {
778 DoC_SelectChip(docptr, mychip->chip);
780 this->curfloor = mychip->floor;
781 this->curchip = mychip->chip;
783 instr->state = MTD_ERASE_PENDING;
785 /* issue the Erase Setup command */
786 DoC_Command(docptr, NAND_CMD_ERASE1, 0x00);
787 DoC_Address(docptr, 2, ofs, 0x00, 0x00);
789 /* Commit the Erase Start command and wait for ready
790 see Software Requirement 11.4 item 1.*/
791 DoC_Command(docptr, NAND_CMD_ERASE2, 0x00);
792 DoC_WaitReady(docptr);
794 instr->state = MTD_ERASING;
796 /* Read the status of the flash device through CDSN IO register
797 see Software Requirement 11.4 item 5.
798 FIXME: it seems that we are not wait long enough, some blocks are not
799 erased fully */
800 DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
801 dummy = ReadDOC(docptr, ReadPipeInit);
802 DoC_Delay(docptr, 2);
803 if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
804 printk("Error Erasing at 0x%x\n", ofs);
805 /* There was an error
806 FIXME: implement Bad Block Replacement (in nftl.c ??) */
807 instr->state = MTD_ERASE_FAILED;
808 } else
809 instr->state = MTD_ERASE_DONE;
810 dummy = ReadDOC(docptr, LastDataRead);
812 mtd_erase_callback(instr);
814 return 0;
817 /****************************************************************************
819 * Module stuff
821 ****************************************************************************/
823 static void __exit cleanup_doc2001(void)
825 struct mtd_info *mtd;
826 struct DiskOnChip *this;
828 while ((mtd=docmillist)) {
829 this = mtd->priv;
830 docmillist = this->nextdoc;
832 del_mtd_device(mtd);
834 iounmap(this->virtadr);
835 kfree(this->chips);
836 kfree(mtd);
840 module_exit(cleanup_doc2001);
842 MODULE_LICENSE("GPL");
843 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
844 MODULE_DESCRIPTION("Alternative driver for DiskOnChip Millennium");