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1da177e4 LT |
1 | /* |
2 | * Linux driver for Disk-On-Chip Millennium Plus | |
3 | * | |
4 | * (c) 2002-2003 Greg Ungerer <gerg@snapgear.com> | |
5 | * (c) 2002-2003 SnapGear Inc | |
6 | * (c) 1999 Machine Vision Holdings, Inc. | |
7 | * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org> | |
8 | * | |
9 | * $Id: doc2001plus.c,v 1.13 2005/01/05 18:05:12 dwmw2 Exp $ | |
10 | * | |
11 | * Released under GPL | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <asm/errno.h> | |
17 | #include <asm/io.h> | |
18 | #include <asm/uaccess.h> | |
19 | #include <linux/miscdevice.h> | |
20 | #include <linux/pci.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/bitops.h> | |
27 | ||
28 | #include <linux/mtd/mtd.h> | |
29 | #include <linux/mtd/nand.h> | |
30 | #include <linux/mtd/doc2000.h> | |
31 | ||
32 | /* #define ECC_DEBUG */ | |
33 | ||
34 | /* I have no idea why some DoC chips can not use memcop_form|to_io(). | |
35 | * This may be due to the different revisions of the ASIC controller built-in or | |
36 | * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment | |
37 | * this:*/ | |
38 | #undef USE_MEMCPY | |
39 | ||
40 | static int doc_read(struct mtd_info *mtd, loff_t from, size_t len, | |
41 | size_t *retlen, u_char *buf); | |
42 | static int doc_write(struct mtd_info *mtd, loff_t to, size_t len, | |
43 | size_t *retlen, const u_char *buf); | |
44 | static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, | |
45 | size_t *retlen, u_char *buf, u_char *eccbuf, | |
46 | struct nand_oobinfo *oobsel); | |
47 | static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len, | |
48 | size_t *retlen, const u_char *buf, u_char *eccbuf, | |
49 | struct nand_oobinfo *oobsel); | |
50 | static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, size_t len, | |
51 | size_t *retlen, u_char *buf); | |
52 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, size_t len, | |
53 | size_t *retlen, const u_char *buf); | |
54 | static int doc_erase (struct mtd_info *mtd, struct erase_info *instr); | |
55 | ||
56 | static struct mtd_info *docmilpluslist = NULL; | |
57 | ||
58 | ||
59 | /* Perform the required delay cycles by writing to the NOP register */ | |
60 | static void DoC_Delay(void __iomem * docptr, int cycles) | |
61 | { | |
62 | int i; | |
63 | ||
64 | for (i = 0; (i < cycles); i++) | |
65 | WriteDOC(0, docptr, Mplus_NOP); | |
66 | } | |
67 | ||
68 | #define CDSN_CTRL_FR_B_MASK (CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1) | |
69 | ||
70 | /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */ | |
71 | static int _DoC_WaitReady(void __iomem * docptr) | |
72 | { | |
73 | unsigned int c = 0xffff; | |
74 | ||
75 | DEBUG(MTD_DEBUG_LEVEL3, | |
76 | "_DoC_WaitReady called for out-of-line wait\n"); | |
77 | ||
78 | /* Out-of-line routine to wait for chip response */ | |
79 | while (((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) && --c) | |
80 | ; | |
81 | ||
82 | if (c == 0) | |
83 | DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n"); | |
84 | ||
85 | return (c == 0); | |
86 | } | |
87 | ||
88 | static inline int DoC_WaitReady(void __iomem * docptr) | |
89 | { | |
90 | /* This is inline, to optimise the common case, where it's ready instantly */ | |
91 | int ret = 0; | |
92 | ||
93 | /* read form NOP register should be issued prior to the read from CDSNControl | |
94 | see Software Requirement 11.4 item 2. */ | |
95 | DoC_Delay(docptr, 4); | |
96 | ||
97 | if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) | |
98 | /* Call the out-of-line routine to wait */ | |
99 | ret = _DoC_WaitReady(docptr); | |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
104 | /* For some reason the Millennium Plus seems to occassionally put itself | |
105 | * into reset mode. For me this happens randomly, with no pattern that I | |
106 | * can detect. M-systems suggest always check this on any block level | |
107 | * operation and setting to normal mode if in reset mode. | |
108 | */ | |
109 | static inline void DoC_CheckASIC(void __iomem * docptr) | |
110 | { | |
111 | /* Make sure the DoC is in normal mode */ | |
112 | if ((ReadDOC(docptr, Mplus_DOCControl) & DOC_MODE_NORMAL) == 0) { | |
113 | WriteDOC((DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_DOCControl); | |
114 | WriteDOC(~(DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_CtrlConfirm); | |
115 | } | |
116 | } | |
117 | ||
118 | /* DoC_Command: Send a flash command to the flash chip through the Flash | |
119 | * command register. Need 2 Write Pipeline Terminates to complete send. | |
120 | */ | |
121 | static inline void DoC_Command(void __iomem * docptr, unsigned char command, | |
122 | unsigned char xtraflags) | |
123 | { | |
124 | WriteDOC(command, docptr, Mplus_FlashCmd); | |
125 | WriteDOC(command, docptr, Mplus_WritePipeTerm); | |
126 | WriteDOC(command, docptr, Mplus_WritePipeTerm); | |
127 | } | |
128 | ||
129 | /* DoC_Address: Set the current address for the flash chip through the Flash | |
130 | * Address register. Need 2 Write Pipeline Terminates to complete send. | |
131 | */ | |
132 | static inline void DoC_Address(struct DiskOnChip *doc, int numbytes, | |
133 | unsigned long ofs, unsigned char xtraflags1, | |
134 | unsigned char xtraflags2) | |
135 | { | |
136 | void __iomem * docptr = doc->virtadr; | |
137 | ||
138 | /* Allow for possible Mill Plus internal flash interleaving */ | |
139 | ofs >>= doc->interleave; | |
140 | ||
141 | switch (numbytes) { | |
142 | case 1: | |
143 | /* Send single byte, bits 0-7. */ | |
144 | WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress); | |
145 | break; | |
146 | case 2: | |
147 | /* Send bits 9-16 followed by 17-23 */ | |
148 | WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress); | |
149 | WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress); | |
150 | break; | |
151 | case 3: | |
152 | /* Send 0-7, 9-16, then 17-23 */ | |
153 | WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress); | |
154 | WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress); | |
155 | WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress); | |
156 | break; | |
157 | default: | |
158 | return; | |
159 | } | |
160 | ||
161 | WriteDOC(0x00, docptr, Mplus_WritePipeTerm); | |
162 | WriteDOC(0x00, docptr, Mplus_WritePipeTerm); | |
163 | } | |
164 | ||
165 | /* DoC_SelectChip: Select a given flash chip within the current floor */ | |
166 | static int DoC_SelectChip(void __iomem * docptr, int chip) | |
167 | { | |
168 | /* No choice for flash chip on Millennium Plus */ | |
169 | return 0; | |
170 | } | |
171 | ||
172 | /* DoC_SelectFloor: Select a given floor (bank of flash chips) */ | |
173 | static int DoC_SelectFloor(void __iomem * docptr, int floor) | |
174 | { | |
175 | WriteDOC((floor & 0x3), docptr, Mplus_DeviceSelect); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Translate the given offset into the appropriate command and offset. | |
181 | * This does the mapping using the 16bit interleave layout defined by | |
182 | * M-Systems, and looks like this for a sector pair: | |
183 | * +-----------+-------+-------+-------+--------------+---------+-----------+ | |
184 | * | 0 --- 511 |512-517|518-519|520-521| 522 --- 1033 |1034-1039|1040 - 1055| | |
185 | * +-----------+-------+-------+-------+--------------+---------+-----------+ | |
186 | * | Data 0 | ECC 0 |Flags0 |Flags1 | Data 1 |ECC 1 | OOB 1 + 2 | | |
187 | * +-----------+-------+-------+-------+--------------+---------+-----------+ | |
188 | */ | |
189 | /* FIXME: This lives in INFTL not here. Other users of flash devices | |
190 | may not want it */ | |
191 | static unsigned int DoC_GetDataOffset(struct mtd_info *mtd, loff_t *from) | |
192 | { | |
193 | struct DiskOnChip *this = mtd->priv; | |
194 | ||
195 | if (this->interleave) { | |
196 | unsigned int ofs = *from & 0x3ff; | |
197 | unsigned int cmd; | |
198 | ||
199 | if (ofs < 512) { | |
200 | cmd = NAND_CMD_READ0; | |
201 | ofs &= 0x1ff; | |
202 | } else if (ofs < 1014) { | |
203 | cmd = NAND_CMD_READ1; | |
204 | ofs = (ofs & 0x1ff) + 10; | |
205 | } else { | |
206 | cmd = NAND_CMD_READOOB; | |
207 | ofs = ofs - 1014; | |
208 | } | |
209 | ||
210 | *from = (*from & ~0x3ff) | ofs; | |
211 | return cmd; | |
212 | } else { | |
213 | /* No interleave */ | |
214 | if ((*from) & 0x100) | |
215 | return NAND_CMD_READ1; | |
216 | return NAND_CMD_READ0; | |
217 | } | |
218 | } | |
219 | ||
220 | static unsigned int DoC_GetECCOffset(struct mtd_info *mtd, loff_t *from) | |
221 | { | |
222 | unsigned int ofs, cmd; | |
223 | ||
224 | if (*from & 0x200) { | |
225 | cmd = NAND_CMD_READOOB; | |
226 | ofs = 10 + (*from & 0xf); | |
227 | } else { | |
228 | cmd = NAND_CMD_READ1; | |
229 | ofs = (*from & 0xf); | |
230 | } | |
231 | ||
232 | *from = (*from & ~0x3ff) | ofs; | |
233 | return cmd; | |
234 | } | |
235 | ||
236 | static unsigned int DoC_GetFlagsOffset(struct mtd_info *mtd, loff_t *from) | |
237 | { | |
238 | unsigned int ofs, cmd; | |
239 | ||
240 | cmd = NAND_CMD_READ1; | |
241 | ofs = (*from & 0x200) ? 8 : 6; | |
242 | *from = (*from & ~0x3ff) | ofs; | |
243 | return cmd; | |
244 | } | |
245 | ||
246 | static unsigned int DoC_GetHdrOffset(struct mtd_info *mtd, loff_t *from) | |
247 | { | |
248 | unsigned int ofs, cmd; | |
249 | ||
250 | cmd = NAND_CMD_READOOB; | |
251 | ofs = (*from & 0x200) ? 24 : 16; | |
252 | *from = (*from & ~0x3ff) | ofs; | |
253 | return cmd; | |
254 | } | |
255 | ||
256 | static inline void MemReadDOC(void __iomem * docptr, unsigned char *buf, int len) | |
257 | { | |
258 | #ifndef USE_MEMCPY | |
259 | int i; | |
260 | for (i = 0; i < len; i++) | |
261 | buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i); | |
262 | #else | |
263 | memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len); | |
264 | #endif | |
265 | } | |
266 | ||
267 | static inline void MemWriteDOC(void __iomem * docptr, unsigned char *buf, int len) | |
268 | { | |
269 | #ifndef USE_MEMCPY | |
270 | int i; | |
271 | for (i = 0; i < len; i++) | |
272 | WriteDOC(buf[i], docptr, Mil_CDSN_IO + i); | |
273 | #else | |
274 | memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len); | |
275 | #endif | |
276 | } | |
277 | ||
278 | /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */ | |
279 | static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip) | |
280 | { | |
281 | int mfr, id, i, j; | |
282 | volatile char dummy; | |
283 | void __iomem * docptr = doc->virtadr; | |
284 | ||
285 | /* Page in the required floor/chip */ | |
286 | DoC_SelectFloor(docptr, floor); | |
287 | DoC_SelectChip(docptr, chip); | |
288 | ||
289 | /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */ | |
290 | WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect); | |
291 | ||
292 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
293 | DoC_Command(docptr, NAND_CMD_RESET, 0); | |
294 | DoC_WaitReady(docptr); | |
295 | ||
296 | /* Read the NAND chip ID: 1. Send ReadID command */ | |
297 | DoC_Command(docptr, NAND_CMD_READID, 0); | |
298 | ||
299 | /* Read the NAND chip ID: 2. Send address byte zero */ | |
300 | DoC_Address(doc, 1, 0x00, 0, 0x00); | |
301 | ||
302 | WriteDOC(0, docptr, Mplus_FlashControl); | |
303 | DoC_WaitReady(docptr); | |
304 | ||
305 | /* Read the manufacturer and device id codes of the flash device through | |
306 | CDSN IO register see Software Requirement 11.4 item 5.*/ | |
307 | dummy = ReadDOC(docptr, Mplus_ReadPipeInit); | |
308 | dummy = ReadDOC(docptr, Mplus_ReadPipeInit); | |
309 | ||
310 | mfr = ReadDOC(docptr, Mil_CDSN_IO); | |
311 | if (doc->interleave) | |
312 | dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */ | |
313 | ||
314 | id = ReadDOC(docptr, Mil_CDSN_IO); | |
315 | if (doc->interleave) | |
316 | dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */ | |
317 | ||
318 | dummy = ReadDOC(docptr, Mplus_LastDataRead); | |
319 | dummy = ReadDOC(docptr, Mplus_LastDataRead); | |
320 | ||
321 | /* Disable flash internally */ | |
322 | WriteDOC(0, docptr, Mplus_FlashSelect); | |
323 | ||
324 | /* No response - return failure */ | |
325 | if (mfr == 0xff || mfr == 0) | |
326 | return 0; | |
327 | ||
328 | for (i = 0; nand_flash_ids[i].name != NULL; i++) { | |
329 | if (id == nand_flash_ids[i].id) { | |
330 | /* Try to identify manufacturer */ | |
331 | for (j = 0; nand_manuf_ids[j].id != 0x0; j++) { | |
332 | if (nand_manuf_ids[j].id == mfr) | |
333 | break; | |
334 | } | |
335 | printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, " | |
336 | "Chip ID: %2.2X (%s:%s)\n", mfr, id, | |
337 | nand_manuf_ids[j].name, nand_flash_ids[i].name); | |
338 | doc->mfr = mfr; | |
339 | doc->id = id; | |
340 | doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1; | |
341 | doc->erasesize = nand_flash_ids[i].erasesize << doc->interleave; | |
342 | break; | |
343 | } | |
344 | } | |
345 | ||
346 | if (nand_flash_ids[i].name == NULL) | |
347 | return 0; | |
348 | return 1; | |
349 | } | |
350 | ||
351 | /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */ | |
352 | static void DoC_ScanChips(struct DiskOnChip *this) | |
353 | { | |
354 | int floor, chip; | |
355 | int numchips[MAX_FLOORS_MPLUS]; | |
356 | int ret; | |
357 | ||
358 | this->numchips = 0; | |
359 | this->mfr = 0; | |
360 | this->id = 0; | |
361 | ||
362 | /* Work out the intended interleave setting */ | |
363 | this->interleave = 0; | |
364 | if (this->ChipID == DOC_ChipID_DocMilPlus32) | |
365 | this->interleave = 1; | |
366 | ||
367 | /* Check the ASIC agrees */ | |
368 | if ( (this->interleave << 2) != | |
369 | (ReadDOC(this->virtadr, Mplus_Configuration) & 4)) { | |
370 | u_char conf = ReadDOC(this->virtadr, Mplus_Configuration); | |
371 | printk(KERN_NOTICE "Setting DiskOnChip Millennium Plus interleave to %s\n", | |
372 | this->interleave?"on (16-bit)":"off (8-bit)"); | |
373 | conf ^= 4; | |
374 | WriteDOC(conf, this->virtadr, Mplus_Configuration); | |
375 | } | |
376 | ||
377 | /* For each floor, find the number of valid chips it contains */ | |
378 | for (floor = 0,ret = 1; floor < MAX_FLOORS_MPLUS; floor++) { | |
379 | numchips[floor] = 0; | |
380 | for (chip = 0; chip < MAX_CHIPS_MPLUS && ret != 0; chip++) { | |
381 | ret = DoC_IdentChip(this, floor, chip); | |
382 | if (ret) { | |
383 | numchips[floor]++; | |
384 | this->numchips++; | |
385 | } | |
386 | } | |
387 | } | |
388 | /* If there are none at all that we recognise, bail */ | |
389 | if (!this->numchips) { | |
390 | printk("No flash chips recognised.\n"); | |
391 | return; | |
392 | } | |
393 | ||
394 | /* Allocate an array to hold the information for each chip */ | |
395 | this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL); | |
396 | if (!this->chips){ | |
397 | printk("MTD: No memory for allocating chip info structures\n"); | |
398 | return; | |
399 | } | |
400 | ||
401 | /* Fill out the chip array with {floor, chipno} for each | |
402 | * detected chip in the device. */ | |
403 | for (floor = 0, ret = 0; floor < MAX_FLOORS_MPLUS; floor++) { | |
404 | for (chip = 0 ; chip < numchips[floor] ; chip++) { | |
405 | this->chips[ret].floor = floor; | |
406 | this->chips[ret].chip = chip; | |
407 | this->chips[ret].curadr = 0; | |
408 | this->chips[ret].curmode = 0x50; | |
409 | ret++; | |
410 | } | |
411 | } | |
412 | ||
413 | /* Calculate and print the total size of the device */ | |
414 | this->totlen = this->numchips * (1 << this->chipshift); | |
415 | printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n", | |
416 | this->numchips ,this->totlen >> 20); | |
417 | } | |
418 | ||
419 | static int DoCMilPlus_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2) | |
420 | { | |
421 | int tmp1, tmp2, retval; | |
422 | ||
423 | if (doc1->physadr == doc2->physadr) | |
424 | return 1; | |
425 | ||
426 | /* Use the alias resolution register which was set aside for this | |
427 | * purpose. If it's value is the same on both chips, they might | |
428 | * be the same chip, and we write to one and check for a change in | |
429 | * the other. It's unclear if this register is usuable in the | |
430 | * DoC 2000 (it's in the Millennium docs), but it seems to work. */ | |
431 | tmp1 = ReadDOC(doc1->virtadr, Mplus_AliasResolution); | |
432 | tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution); | |
433 | if (tmp1 != tmp2) | |
434 | return 0; | |
435 | ||
436 | WriteDOC((tmp1+1) % 0xff, doc1->virtadr, Mplus_AliasResolution); | |
437 | tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution); | |
438 | if (tmp2 == (tmp1+1) % 0xff) | |
439 | retval = 1; | |
440 | else | |
441 | retval = 0; | |
442 | ||
443 | /* Restore register contents. May not be necessary, but do it just to | |
444 | * be safe. */ | |
445 | WriteDOC(tmp1, doc1->virtadr, Mplus_AliasResolution); | |
446 | ||
447 | return retval; | |
448 | } | |
449 | ||
450 | static const char im_name[] = "DoCMilPlus_init"; | |
451 | ||
452 | /* This routine is made available to other mtd code via | |
453 | * inter_module_register. It must only be accessed through | |
454 | * inter_module_get which will bump the use count of this module. The | |
455 | * addresses passed back in mtd are valid as long as the use count of | |
456 | * this module is non-zero, i.e. between inter_module_get and | |
457 | * inter_module_put. Keith Owens <kaos@ocs.com.au> 29 Oct 2000. | |
458 | */ | |
459 | static void DoCMilPlus_init(struct mtd_info *mtd) | |
460 | { | |
461 | struct DiskOnChip *this = mtd->priv; | |
462 | struct DiskOnChip *old = NULL; | |
463 | ||
464 | /* We must avoid being called twice for the same device. */ | |
465 | if (docmilpluslist) | |
466 | old = docmilpluslist->priv; | |
467 | ||
468 | while (old) { | |
469 | if (DoCMilPlus_is_alias(this, old)) { | |
470 | printk(KERN_NOTICE "Ignoring DiskOnChip Millennium " | |
471 | "Plus at 0x%lX - already configured\n", | |
472 | this->physadr); | |
473 | iounmap(this->virtadr); | |
474 | kfree(mtd); | |
475 | return; | |
476 | } | |
477 | if (old->nextdoc) | |
478 | old = old->nextdoc->priv; | |
479 | else | |
480 | old = NULL; | |
481 | } | |
482 | ||
483 | mtd->name = "DiskOnChip Millennium Plus"; | |
484 | printk(KERN_NOTICE "DiskOnChip Millennium Plus found at " | |
485 | "address 0x%lX\n", this->physadr); | |
486 | ||
487 | mtd->type = MTD_NANDFLASH; | |
488 | mtd->flags = MTD_CAP_NANDFLASH; | |
489 | mtd->ecctype = MTD_ECC_RS_DiskOnChip; | |
490 | mtd->size = 0; | |
491 | ||
492 | mtd->erasesize = 0; | |
493 | mtd->oobblock = 512; | |
494 | mtd->oobsize = 16; | |
495 | mtd->owner = THIS_MODULE; | |
496 | mtd->erase = doc_erase; | |
497 | mtd->point = NULL; | |
498 | mtd->unpoint = NULL; | |
499 | mtd->read = doc_read; | |
500 | mtd->write = doc_write; | |
501 | mtd->read_ecc = doc_read_ecc; | |
502 | mtd->write_ecc = doc_write_ecc; | |
503 | mtd->read_oob = doc_read_oob; | |
504 | mtd->write_oob = doc_write_oob; | |
505 | mtd->sync = NULL; | |
506 | ||
507 | this->totlen = 0; | |
508 | this->numchips = 0; | |
509 | this->curfloor = -1; | |
510 | this->curchip = -1; | |
511 | ||
512 | /* Ident all the chips present. */ | |
513 | DoC_ScanChips(this); | |
514 | ||
515 | if (!this->totlen) { | |
516 | kfree(mtd); | |
517 | iounmap(this->virtadr); | |
518 | } else { | |
519 | this->nextdoc = docmilpluslist; | |
520 | docmilpluslist = mtd; | |
521 | mtd->size = this->totlen; | |
522 | mtd->erasesize = this->erasesize; | |
523 | add_mtd_device(mtd); | |
524 | return; | |
525 | } | |
526 | } | |
527 | ||
528 | #if 0 | |
529 | static int doc_dumpblk(struct mtd_info *mtd, loff_t from) | |
530 | { | |
531 | int i; | |
532 | loff_t fofs; | |
533 | struct DiskOnChip *this = mtd->priv; | |
534 | void __iomem * docptr = this->virtadr; | |
535 | struct Nand *mychip = &this->chips[from >> (this->chipshift)]; | |
536 | unsigned char *bp, buf[1056]; | |
537 | char c[32]; | |
538 | ||
539 | from &= ~0x3ff; | |
540 | ||
541 | /* Don't allow read past end of device */ | |
542 | if (from >= this->totlen) | |
543 | return -EINVAL; | |
544 | ||
545 | DoC_CheckASIC(docptr); | |
546 | ||
547 | /* Find the chip which is to be used and select it */ | |
548 | if (this->curfloor != mychip->floor) { | |
549 | DoC_SelectFloor(docptr, mychip->floor); | |
550 | DoC_SelectChip(docptr, mychip->chip); | |
551 | } else if (this->curchip != mychip->chip) { | |
552 | DoC_SelectChip(docptr, mychip->chip); | |
553 | } | |
554 | this->curfloor = mychip->floor; | |
555 | this->curchip = mychip->chip; | |
556 | ||
557 | /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */ | |
558 | WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect); | |
559 | ||
560 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
561 | DoC_Command(docptr, NAND_CMD_RESET, 0); | |
562 | DoC_WaitReady(docptr); | |
563 | ||
564 | fofs = from; | |
565 | DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0); | |
566 | DoC_Address(this, 3, fofs, 0, 0x00); | |
567 | WriteDOC(0, docptr, Mplus_FlashControl); | |
568 | DoC_WaitReady(docptr); | |
569 | ||
570 | /* disable the ECC engine */ | |
571 | WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf); | |
572 | ||
573 | ReadDOC(docptr, Mplus_ReadPipeInit); | |
574 | ReadDOC(docptr, Mplus_ReadPipeInit); | |
575 | ||
576 | /* Read the data via the internal pipeline through CDSN IO | |
577 | register, see Pipelined Read Operations 11.3 */ | |
578 | MemReadDOC(docptr, buf, 1054); | |
579 | buf[1054] = ReadDOC(docptr, Mplus_LastDataRead); | |
580 | buf[1055] = ReadDOC(docptr, Mplus_LastDataRead); | |
581 | ||
582 | memset(&c[0], 0, sizeof(c)); | |
583 | printk("DUMP OFFSET=%x:\n", (int)from); | |
584 | ||
585 | for (i = 0, bp = &buf[0]; (i < 1056); i++) { | |
586 | if ((i % 16) == 0) | |
587 | printk("%08x: ", i); | |
588 | printk(" %02x", *bp); | |
589 | c[(i & 0xf)] = ((*bp >= 0x20) && (*bp <= 0x7f)) ? *bp : '.'; | |
590 | bp++; | |
591 | if (((i + 1) % 16) == 0) | |
592 | printk(" %s\n", c); | |
593 | } | |
594 | printk("\n"); | |
595 | ||
596 | /* Disable flash internally */ | |
597 | WriteDOC(0, docptr, Mplus_FlashSelect); | |
598 | ||
599 | return 0; | |
600 | } | |
601 | #endif | |
602 | ||
603 | static int doc_read(struct mtd_info *mtd, loff_t from, size_t len, | |
604 | size_t *retlen, u_char *buf) | |
605 | { | |
606 | /* Just a special case of doc_read_ecc */ | |
607 | return doc_read_ecc(mtd, from, len, retlen, buf, NULL, NULL); | |
608 | } | |
609 | ||
610 | static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, | |
611 | size_t *retlen, u_char *buf, u_char *eccbuf, | |
612 | struct nand_oobinfo *oobsel) | |
613 | { | |
614 | int ret, i; | |
615 | volatile char dummy; | |
616 | loff_t fofs; | |
617 | unsigned char syndrome[6]; | |
618 | struct DiskOnChip *this = mtd->priv; | |
619 | void __iomem * docptr = this->virtadr; | |
620 | struct Nand *mychip = &this->chips[from >> (this->chipshift)]; | |
621 | ||
622 | /* Don't allow read past end of device */ | |
623 | if (from >= this->totlen) | |
624 | return -EINVAL; | |
625 | ||
626 | /* Don't allow a single read to cross a 512-byte block boundary */ | |
627 | if (from + len > ((from | 0x1ff) + 1)) | |
628 | len = ((from | 0x1ff) + 1) - from; | |
629 | ||
630 | DoC_CheckASIC(docptr); | |
631 | ||
632 | /* Find the chip which is to be used and select it */ | |
633 | if (this->curfloor != mychip->floor) { | |
634 | DoC_SelectFloor(docptr, mychip->floor); | |
635 | DoC_SelectChip(docptr, mychip->chip); | |
636 | } else if (this->curchip != mychip->chip) { | |
637 | DoC_SelectChip(docptr, mychip->chip); | |
638 | } | |
639 | this->curfloor = mychip->floor; | |
640 | this->curchip = mychip->chip; | |
641 | ||
642 | /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */ | |
643 | WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect); | |
644 | ||
645 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
646 | DoC_Command(docptr, NAND_CMD_RESET, 0); | |
647 | DoC_WaitReady(docptr); | |
648 | ||
649 | fofs = from; | |
650 | DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0); | |
651 | DoC_Address(this, 3, fofs, 0, 0x00); | |
652 | WriteDOC(0, docptr, Mplus_FlashControl); | |
653 | DoC_WaitReady(docptr); | |
654 | ||
655 | if (eccbuf) { | |
656 | /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/ | |
657 | WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf); | |
658 | WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf); | |
659 | } else { | |
660 | /* disable the ECC engine */ | |
661 | WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf); | |
662 | } | |
663 | ||
664 | /* Let the caller know we completed it */ | |
665 | *retlen = len; | |
666 | ret = 0; | |
667 | ||
668 | ReadDOC(docptr, Mplus_ReadPipeInit); | |
669 | ReadDOC(docptr, Mplus_ReadPipeInit); | |
670 | ||
671 | if (eccbuf) { | |
672 | /* Read the data via the internal pipeline through CDSN IO | |
673 | register, see Pipelined Read Operations 11.3 */ | |
674 | MemReadDOC(docptr, buf, len); | |
675 | ||
676 | /* Read the ECC data following raw data */ | |
677 | MemReadDOC(docptr, eccbuf, 4); | |
678 | eccbuf[4] = ReadDOC(docptr, Mplus_LastDataRead); | |
679 | eccbuf[5] = ReadDOC(docptr, Mplus_LastDataRead); | |
680 | ||
681 | /* Flush the pipeline */ | |
682 | dummy = ReadDOC(docptr, Mplus_ECCConf); | |
683 | dummy = ReadDOC(docptr, Mplus_ECCConf); | |
684 | ||
685 | /* Check the ECC Status */ | |
686 | if (ReadDOC(docptr, Mplus_ECCConf) & 0x80) { | |
687 | int nb_errors; | |
688 | /* There was an ECC error */ | |
689 | #ifdef ECC_DEBUG | |
690 | printk("DiskOnChip ECC Error: Read at %lx\n", (long)from); | |
691 | #endif | |
692 | /* Read the ECC syndrom through the DiskOnChip ECC logic. | |
693 | These syndrome will be all ZERO when there is no error */ | |
694 | for (i = 0; i < 6; i++) | |
695 | syndrome[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i); | |
696 | ||
697 | nb_errors = doc_decode_ecc(buf, syndrome); | |
698 | #ifdef ECC_DEBUG | |
699 | printk("ECC Errors corrected: %x\n", nb_errors); | |
700 | #endif | |
701 | if (nb_errors < 0) { | |
702 | /* We return error, but have actually done the read. Not that | |
703 | this can be told to user-space, via sys_read(), but at least | |
704 | MTD-aware stuff can know about it by checking *retlen */ | |
705 | #ifdef ECC_DEBUG | |
706 | printk("%s(%d): Millennium Plus ECC error (from=0x%x:\n", | |
707 | __FILE__, __LINE__, (int)from); | |
708 | printk(" syndrome= %02x:%02x:%02x:%02x:%02x:" | |
709 | "%02x\n", | |
710 | syndrome[0], syndrome[1], syndrome[2], | |
711 | syndrome[3], syndrome[4], syndrome[5]); | |
712 | printk(" eccbuf= %02x:%02x:%02x:%02x:%02x:" | |
713 | "%02x\n", | |
714 | eccbuf[0], eccbuf[1], eccbuf[2], | |
715 | eccbuf[3], eccbuf[4], eccbuf[5]); | |
716 | #endif | |
717 | ret = -EIO; | |
718 | } | |
719 | } | |
720 | ||
721 | #ifdef PSYCHO_DEBUG | |
722 | printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", | |
723 | (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3], | |
724 | eccbuf[4], eccbuf[5]); | |
725 | #endif | |
726 | ||
727 | /* disable the ECC engine */ | |
728 | WriteDOC(DOC_ECC_DIS, docptr , Mplus_ECCConf); | |
729 | } else { | |
730 | /* Read the data via the internal pipeline through CDSN IO | |
731 | register, see Pipelined Read Operations 11.3 */ | |
732 | MemReadDOC(docptr, buf, len-2); | |
733 | buf[len-2] = ReadDOC(docptr, Mplus_LastDataRead); | |
734 | buf[len-1] = ReadDOC(docptr, Mplus_LastDataRead); | |
735 | } | |
736 | ||
737 | /* Disable flash internally */ | |
738 | WriteDOC(0, docptr, Mplus_FlashSelect); | |
739 | ||
740 | return ret; | |
741 | } | |
742 | ||
743 | static int doc_write(struct mtd_info *mtd, loff_t to, size_t len, | |
744 | size_t *retlen, const u_char *buf) | |
745 | { | |
746 | char eccbuf[6]; | |
747 | return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf, NULL); | |
748 | } | |
749 | ||
750 | static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len, | |
751 | size_t *retlen, const u_char *buf, u_char *eccbuf, | |
752 | struct nand_oobinfo *oobsel) | |
753 | { | |
754 | int i, before, ret = 0; | |
755 | loff_t fto; | |
756 | volatile char dummy; | |
757 | struct DiskOnChip *this = mtd->priv; | |
758 | void __iomem * docptr = this->virtadr; | |
759 | struct Nand *mychip = &this->chips[to >> (this->chipshift)]; | |
760 | ||
761 | /* Don't allow write past end of device */ | |
762 | if (to >= this->totlen) | |
763 | return -EINVAL; | |
764 | ||
765 | /* Don't allow writes which aren't exactly one block (512 bytes) */ | |
766 | if ((to & 0x1ff) || (len != 0x200)) | |
767 | return -EINVAL; | |
768 | ||
769 | /* Determine position of OOB flags, before or after data */ | |
770 | before = (this->interleave && (to & 0x200)); | |
771 | ||
772 | DoC_CheckASIC(docptr); | |
773 | ||
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); | |
780 | } | |
781 | this->curfloor = mychip->floor; | |
782 | this->curchip = mychip->chip; | |
783 | ||
784 | /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */ | |
785 | WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect); | |
786 | ||
787 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
788 | DoC_Command(docptr, NAND_CMD_RESET, 0); | |
789 | DoC_WaitReady(docptr); | |
790 | ||
791 | /* Set device to appropriate plane of flash */ | |
792 | fto = to; | |
793 | WriteDOC(DoC_GetDataOffset(mtd, &fto), docptr, Mplus_FlashCmd); | |
794 | ||
795 | /* On interleaved devices the flags for 2nd half 512 are before data */ | |
796 | if (eccbuf && before) | |
797 | fto -= 2; | |
798 | ||
799 | /* issue the Serial Data In command to initial the Page Program process */ | |
800 | DoC_Command(docptr, NAND_CMD_SEQIN, 0x00); | |
801 | DoC_Address(this, 3, fto, 0x00, 0x00); | |
802 | ||
803 | /* Disable the ECC engine */ | |
804 | WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf); | |
805 | ||
806 | if (eccbuf) { | |
807 | if (before) { | |
808 | /* Write the block status BLOCK_USED (0x5555) */ | |
809 | WriteDOC(0x55, docptr, Mil_CDSN_IO); | |
810 | WriteDOC(0x55, docptr, Mil_CDSN_IO); | |
811 | } | |
812 | ||
813 | /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/ | |
814 | WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf); | |
815 | } | |
816 | ||
817 | MemWriteDOC(docptr, (unsigned char *) buf, len); | |
818 | ||
819 | if (eccbuf) { | |
820 | /* Write ECC data to flash, the ECC info is generated by | |
821 | the DiskOnChip ECC logic see Reed-Solomon EDC/ECC 11.1 */ | |
822 | DoC_Delay(docptr, 3); | |
823 | ||
824 | /* Read the ECC data through the DiskOnChip ECC logic */ | |
825 | for (i = 0; i < 6; i++) | |
826 | eccbuf[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i); | |
827 | ||
828 | /* disable the ECC engine */ | |
829 | WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf); | |
830 | ||
831 | /* Write the ECC data to flash */ | |
832 | MemWriteDOC(docptr, eccbuf, 6); | |
833 | ||
834 | if (!before) { | |
835 | /* Write the block status BLOCK_USED (0x5555) */ | |
836 | WriteDOC(0x55, docptr, Mil_CDSN_IO+6); | |
837 | WriteDOC(0x55, docptr, Mil_CDSN_IO+7); | |
838 | } | |
839 | ||
840 | #ifdef PSYCHO_DEBUG | |
841 | printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", | |
842 | (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3], | |
843 | eccbuf[4], eccbuf[5]); | |
844 | #endif | |
845 | } | |
846 | ||
847 | WriteDOC(0x00, docptr, Mplus_WritePipeTerm); | |
848 | WriteDOC(0x00, docptr, Mplus_WritePipeTerm); | |
849 | ||
850 | /* Commit the Page Program command and wait for ready | |
851 | see Software Requirement 11.4 item 1.*/ | |
852 | DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00); | |
853 | DoC_WaitReady(docptr); | |
854 | ||
855 | /* Read the status of the flash device through CDSN IO register | |
856 | see Software Requirement 11.4 item 5.*/ | |
857 | DoC_Command(docptr, NAND_CMD_STATUS, 0); | |
858 | dummy = ReadDOC(docptr, Mplus_ReadPipeInit); | |
859 | dummy = ReadDOC(docptr, Mplus_ReadPipeInit); | |
860 | DoC_Delay(docptr, 2); | |
861 | if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) { | |
862 | printk("MTD: Error 0x%x programming at 0x%x\n", dummy, (int)to); | |
863 | /* Error in programming | |
864 | FIXME: implement Bad Block Replacement (in nftl.c ??) */ | |
865 | *retlen = 0; | |
866 | ret = -EIO; | |
867 | } | |
868 | dummy = ReadDOC(docptr, Mplus_LastDataRead); | |
869 | ||
870 | /* Disable flash internally */ | |
871 | WriteDOC(0, docptr, Mplus_FlashSelect); | |
872 | ||
873 | /* Let the caller know we completed it */ | |
874 | *retlen = len; | |
875 | ||
876 | return ret; | |
877 | } | |
878 | ||
879 | static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, size_t len, | |
880 | size_t *retlen, u_char *buf) | |
881 | { | |
882 | loff_t fofs, base; | |
883 | struct DiskOnChip *this = mtd->priv; | |
884 | void __iomem * docptr = this->virtadr; | |
885 | struct Nand *mychip = &this->chips[ofs >> this->chipshift]; | |
886 | size_t i, size, got, want; | |
887 | ||
888 | DoC_CheckASIC(docptr); | |
889 | ||
890 | /* Find the chip which is to be used and select it */ | |
891 | if (this->curfloor != mychip->floor) { | |
892 | DoC_SelectFloor(docptr, mychip->floor); | |
893 | DoC_SelectChip(docptr, mychip->chip); | |
894 | } else if (this->curchip != mychip->chip) { | |
895 | DoC_SelectChip(docptr, mychip->chip); | |
896 | } | |
897 | this->curfloor = mychip->floor; | |
898 | this->curchip = mychip->chip; | |
899 | ||
900 | /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */ | |
901 | WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect); | |
902 | ||
903 | /* disable the ECC engine */ | |
904 | WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf); | |
905 | DoC_WaitReady(docptr); | |
906 | ||
907 | /* Maximum of 16 bytes in the OOB region, so limit read to that */ | |
908 | if (len > 16) | |
909 | len = 16; | |
910 | got = 0; | |
911 | want = len; | |
912 | ||
913 | for (i = 0; ((i < 3) && (want > 0)); i++) { | |
914 | /* Figure out which region we are accessing... */ | |
915 | fofs = ofs; | |
916 | base = ofs & 0xf; | |
917 | if (!this->interleave) { | |
918 | DoC_Command(docptr, NAND_CMD_READOOB, 0); | |
919 | size = 16 - base; | |
920 | } else if (base < 6) { | |
921 | DoC_Command(docptr, DoC_GetECCOffset(mtd, &fofs), 0); | |
922 | size = 6 - base; | |
923 | } else if (base < 8) { | |
924 | DoC_Command(docptr, DoC_GetFlagsOffset(mtd, &fofs), 0); | |
925 | size = 8 - base; | |
926 | } else { | |
927 | DoC_Command(docptr, DoC_GetHdrOffset(mtd, &fofs), 0); | |
928 | size = 16 - base; | |
929 | } | |
930 | if (size > want) | |
931 | size = want; | |
932 | ||
933 | /* Issue read command */ | |
934 | DoC_Address(this, 3, fofs, 0, 0x00); | |
935 | WriteDOC(0, docptr, Mplus_FlashControl); | |
936 | DoC_WaitReady(docptr); | |
937 | ||
938 | ReadDOC(docptr, Mplus_ReadPipeInit); | |
939 | ReadDOC(docptr, Mplus_ReadPipeInit); | |
940 | MemReadDOC(docptr, &buf[got], size - 2); | |
941 | buf[got + size - 2] = ReadDOC(docptr, Mplus_LastDataRead); | |
942 | buf[got + size - 1] = ReadDOC(docptr, Mplus_LastDataRead); | |
943 | ||
944 | ofs += size; | |
945 | got += size; | |
946 | want -= size; | |
947 | } | |
948 | ||
949 | /* Disable flash internally */ | |
950 | WriteDOC(0, docptr, Mplus_FlashSelect); | |
951 | ||
952 | *retlen = len; | |
953 | return 0; | |
954 | } | |
955 | ||
956 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, size_t len, | |
957 | size_t *retlen, const u_char *buf) | |
958 | { | |
959 | volatile char dummy; | |
960 | loff_t fofs, base; | |
961 | struct DiskOnChip *this = mtd->priv; | |
962 | void __iomem * docptr = this->virtadr; | |
963 | struct Nand *mychip = &this->chips[ofs >> this->chipshift]; | |
964 | size_t i, size, got, want; | |
965 | int ret = 0; | |
966 | ||
967 | DoC_CheckASIC(docptr); | |
968 | ||
969 | /* Find the chip which is to be used and select it */ | |
970 | if (this->curfloor != mychip->floor) { | |
971 | DoC_SelectFloor(docptr, mychip->floor); | |
972 | DoC_SelectChip(docptr, mychip->chip); | |
973 | } else if (this->curchip != mychip->chip) { | |
974 | DoC_SelectChip(docptr, mychip->chip); | |
975 | } | |
976 | this->curfloor = mychip->floor; | |
977 | this->curchip = mychip->chip; | |
978 | ||
979 | /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */ | |
980 | WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect); | |
981 | ||
982 | ||
983 | /* Maximum of 16 bytes in the OOB region, so limit write to that */ | |
984 | if (len > 16) | |
985 | len = 16; | |
986 | got = 0; | |
987 | want = len; | |
988 | ||
989 | for (i = 0; ((i < 3) && (want > 0)); i++) { | |
990 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
991 | DoC_Command(docptr, NAND_CMD_RESET, 0); | |
992 | DoC_WaitReady(docptr); | |
993 | ||
994 | /* Figure out which region we are accessing... */ | |
995 | fofs = ofs; | |
996 | base = ofs & 0x0f; | |
997 | if (!this->interleave) { | |
998 | WriteDOC(NAND_CMD_READOOB, docptr, Mplus_FlashCmd); | |
999 | size = 16 - base; | |
1000 | } else if (base < 6) { | |
1001 | WriteDOC(DoC_GetECCOffset(mtd, &fofs), docptr, Mplus_FlashCmd); | |
1002 | size = 6 - base; | |
1003 | } else if (base < 8) { | |
1004 | WriteDOC(DoC_GetFlagsOffset(mtd, &fofs), docptr, Mplus_FlashCmd); | |
1005 | size = 8 - base; | |
1006 | } else { | |
1007 | WriteDOC(DoC_GetHdrOffset(mtd, &fofs), docptr, Mplus_FlashCmd); | |
1008 | size = 16 - base; | |
1009 | } | |
1010 | if (size > want) | |
1011 | size = want; | |
1012 | ||
1013 | /* Issue the Serial Data In command to initial the Page Program process */ | |
1014 | DoC_Command(docptr, NAND_CMD_SEQIN, 0x00); | |
1015 | DoC_Address(this, 3, fofs, 0, 0x00); | |
1016 | ||
1017 | /* Disable the ECC engine */ | |
1018 | WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf); | |
1019 | ||
1020 | /* Write the data via the internal pipeline through CDSN IO | |
1021 | register, see Pipelined Write Operations 11.2 */ | |
1022 | MemWriteDOC(docptr, (unsigned char *) &buf[got], size); | |
1023 | WriteDOC(0x00, docptr, Mplus_WritePipeTerm); | |
1024 | WriteDOC(0x00, docptr, Mplus_WritePipeTerm); | |
1025 | ||
1026 | /* Commit the Page Program command and wait for ready | |
1027 | see Software Requirement 11.4 item 1.*/ | |
1028 | DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00); | |
1029 | DoC_WaitReady(docptr); | |
1030 | ||
1031 | /* Read the status of the flash device through CDSN IO register | |
1032 | see Software Requirement 11.4 item 5.*/ | |
1033 | DoC_Command(docptr, NAND_CMD_STATUS, 0x00); | |
1034 | dummy = ReadDOC(docptr, Mplus_ReadPipeInit); | |
1035 | dummy = ReadDOC(docptr, Mplus_ReadPipeInit); | |
1036 | DoC_Delay(docptr, 2); | |
1037 | if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) { | |
1038 | printk("MTD: Error 0x%x programming oob at 0x%x\n", | |
1039 | dummy, (int)ofs); | |
1040 | /* FIXME: implement Bad Block Replacement */ | |
1041 | *retlen = 0; | |
1042 | ret = -EIO; | |
1043 | } | |
1044 | dummy = ReadDOC(docptr, Mplus_LastDataRead); | |
1045 | ||
1046 | ofs += size; | |
1047 | got += size; | |
1048 | want -= size; | |
1049 | } | |
1050 | ||
1051 | /* Disable flash internally */ | |
1052 | WriteDOC(0, docptr, Mplus_FlashSelect); | |
1053 | ||
1054 | *retlen = len; | |
1055 | return ret; | |
1056 | } | |
1057 | ||
1058 | int doc_erase(struct mtd_info *mtd, struct erase_info *instr) | |
1059 | { | |
1060 | volatile char dummy; | |
1061 | struct DiskOnChip *this = mtd->priv; | |
1062 | __u32 ofs = instr->addr; | |
1063 | __u32 len = instr->len; | |
1064 | void __iomem * docptr = this->virtadr; | |
1065 | struct Nand *mychip = &this->chips[ofs >> this->chipshift]; | |
1066 | ||
1067 | DoC_CheckASIC(docptr); | |
1068 | ||
1069 | if (len != mtd->erasesize) | |
1070 | printk(KERN_WARNING "MTD: Erase not right size (%x != %x)n", | |
1071 | len, mtd->erasesize); | |
1072 | ||
1073 | /* Find the chip which is to be used and select it */ | |
1074 | if (this->curfloor != mychip->floor) { | |
1075 | DoC_SelectFloor(docptr, mychip->floor); | |
1076 | DoC_SelectChip(docptr, mychip->chip); | |
1077 | } else if (this->curchip != mychip->chip) { | |
1078 | DoC_SelectChip(docptr, mychip->chip); | |
1079 | } | |
1080 | this->curfloor = mychip->floor; | |
1081 | this->curchip = mychip->chip; | |
1082 | ||
1083 | instr->state = MTD_ERASE_PENDING; | |
1084 | ||
1085 | /* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */ | |
1086 | WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect); | |
1087 | ||
1088 | DoC_Command(docptr, NAND_CMD_RESET, 0x00); | |
1089 | DoC_WaitReady(docptr); | |
1090 | ||
1091 | DoC_Command(docptr, NAND_CMD_ERASE1, 0); | |
1092 | DoC_Address(this, 2, ofs, 0, 0x00); | |
1093 | DoC_Command(docptr, NAND_CMD_ERASE2, 0); | |
1094 | DoC_WaitReady(docptr); | |
1095 | instr->state = MTD_ERASING; | |
1096 | ||
1097 | /* Read the status of the flash device through CDSN IO register | |
1098 | see Software Requirement 11.4 item 5. */ | |
1099 | DoC_Command(docptr, NAND_CMD_STATUS, 0); | |
1100 | dummy = ReadDOC(docptr, Mplus_ReadPipeInit); | |
1101 | dummy = ReadDOC(docptr, Mplus_ReadPipeInit); | |
1102 | if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) { | |
1103 | printk("MTD: Error 0x%x erasing at 0x%x\n", dummy, ofs); | |
1104 | /* FIXME: implement Bad Block Replacement (in nftl.c ??) */ | |
1105 | instr->state = MTD_ERASE_FAILED; | |
1106 | } else { | |
1107 | instr->state = MTD_ERASE_DONE; | |
1108 | } | |
1109 | dummy = ReadDOC(docptr, Mplus_LastDataRead); | |
1110 | ||
1111 | /* Disable flash internally */ | |
1112 | WriteDOC(0, docptr, Mplus_FlashSelect); | |
1113 | ||
1114 | mtd_erase_callback(instr); | |
1115 | ||
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | /**************************************************************************** | |
1120 | * | |
1121 | * Module stuff | |
1122 | * | |
1123 | ****************************************************************************/ | |
1124 | ||
1125 | static int __init init_doc2001plus(void) | |
1126 | { | |
1127 | inter_module_register(im_name, THIS_MODULE, &DoCMilPlus_init); | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | static void __exit cleanup_doc2001plus(void) | |
1132 | { | |
1133 | struct mtd_info *mtd; | |
1134 | struct DiskOnChip *this; | |
1135 | ||
1136 | while ((mtd=docmilpluslist)) { | |
1137 | this = mtd->priv; | |
1138 | docmilpluslist = this->nextdoc; | |
1139 | ||
1140 | del_mtd_device(mtd); | |
1141 | ||
1142 | iounmap(this->virtadr); | |
1143 | kfree(this->chips); | |
1144 | kfree(mtd); | |
1145 | } | |
1146 | inter_module_unregister(im_name); | |
1147 | } | |
1148 | ||
1149 | module_exit(cleanup_doc2001plus); | |
1150 | module_init(init_doc2001plus); | |
1151 | ||
1152 | MODULE_LICENSE("GPL"); | |
1153 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com> et al."); | |
1154 | MODULE_DESCRIPTION("Driver for DiskOnChip Millennium Plus"); |