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1da177e4 LT |
1 | |
2 | /* | |
3 | * Linux driver for Disk-On-Chip 2000 and Millennium | |
4 | * (c) 1999 Machine Vision Holdings, Inc. | |
5 | * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org> | |
6 | * | |
7 | * $Id: doc2000.c,v 1.66 2005/01/05 18:05:12 dwmw2 Exp $ | |
8 | */ | |
9 | ||
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/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> | |
23 | ||
24 | #include <linux/mtd/mtd.h> | |
25 | #include <linux/mtd/nand.h> | |
26 | #include <linux/mtd/doc2000.h> | |
27 | ||
28 | #define DOC_SUPPORT_2000 | |
29 | #define DOC_SUPPORT_2000TSOP | |
30 | #define DOC_SUPPORT_MILLENNIUM | |
31 | ||
32 | #ifdef DOC_SUPPORT_2000 | |
33 | #define DoC_is_2000(doc) (doc->ChipID == DOC_ChipID_Doc2k) | |
34 | #else | |
35 | #define DoC_is_2000(doc) (0) | |
36 | #endif | |
37 | ||
38 | #if defined(DOC_SUPPORT_2000TSOP) || defined(DOC_SUPPORT_MILLENNIUM) | |
39 | #define DoC_is_Millennium(doc) (doc->ChipID == DOC_ChipID_DocMil) | |
40 | #else | |
41 | #define DoC_is_Millennium(doc) (0) | |
42 | #endif | |
43 | ||
44 | /* #define ECC_DEBUG */ | |
45 | ||
46 | /* I have no idea why some DoC chips can not use memcpy_from|to_io(). | |
47 | * This may be due to the different revisions of the ASIC controller built-in or | |
48 | * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment | |
49 | * this: | |
50 | #undef USE_MEMCPY | |
51 | */ | |
52 | ||
53 | static int doc_read(struct mtd_info *mtd, loff_t from, size_t len, | |
54 | size_t *retlen, u_char *buf); | |
55 | static int doc_write(struct mtd_info *mtd, loff_t to, size_t len, | |
56 | size_t *retlen, const u_char *buf); | |
57 | static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, | |
58 | size_t *retlen, u_char *buf, u_char *eccbuf, struct nand_oobinfo *oobsel); | |
59 | static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len, | |
60 | size_t *retlen, const u_char *buf, u_char *eccbuf, struct nand_oobinfo *oobsel); | |
61 | static int doc_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs, | |
62 | unsigned long count, loff_t to, size_t *retlen, | |
63 | u_char *eccbuf, struct nand_oobinfo *oobsel); | |
64 | static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, size_t len, | |
65 | size_t *retlen, u_char *buf); | |
66 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, size_t len, | |
67 | size_t *retlen, const u_char *buf); | |
68 | static int doc_write_oob_nolock(struct mtd_info *mtd, loff_t ofs, size_t len, | |
69 | size_t *retlen, const u_char *buf); | |
70 | static int doc_erase (struct mtd_info *mtd, struct erase_info *instr); | |
71 | ||
72 | static struct mtd_info *doc2klist = NULL; | |
73 | ||
74 | /* Perform the required delay cycles by reading from the appropriate register */ | |
75 | static void DoC_Delay(struct DiskOnChip *doc, unsigned short cycles) | |
76 | { | |
77 | volatile char dummy; | |
78 | int i; | |
79 | ||
80 | for (i = 0; i < cycles; i++) { | |
81 | if (DoC_is_Millennium(doc)) | |
82 | dummy = ReadDOC(doc->virtadr, NOP); | |
83 | else | |
84 | dummy = ReadDOC(doc->virtadr, DOCStatus); | |
85 | } | |
86 | ||
87 | } | |
88 | ||
89 | /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */ | |
90 | static int _DoC_WaitReady(struct DiskOnChip *doc) | |
91 | { | |
92 | void __iomem *docptr = doc->virtadr; | |
93 | unsigned long timeo = jiffies + (HZ * 10); | |
94 | ||
95 | DEBUG(MTD_DEBUG_LEVEL3, | |
96 | "_DoC_WaitReady called for out-of-line wait\n"); | |
97 | ||
98 | /* Out-of-line routine to wait for chip response */ | |
99 | while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) { | |
100 | /* issue 2 read from NOP register after reading from CDSNControl register | |
101 | see Software Requirement 11.4 item 2. */ | |
102 | DoC_Delay(doc, 2); | |
103 | ||
104 | if (time_after(jiffies, timeo)) { | |
105 | DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n"); | |
106 | return -EIO; | |
107 | } | |
108 | udelay(1); | |
109 | cond_resched(); | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static inline int DoC_WaitReady(struct DiskOnChip *doc) | |
116 | { | |
117 | void __iomem *docptr = doc->virtadr; | |
118 | ||
119 | /* This is inline, to optimise the common case, where it's ready instantly */ | |
120 | int ret = 0; | |
121 | ||
122 | /* 4 read form NOP register should be issued in prior to the read from CDSNControl | |
123 | see Software Requirement 11.4 item 2. */ | |
124 | DoC_Delay(doc, 4); | |
125 | ||
126 | if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) | |
127 | /* Call the out-of-line routine to wait */ | |
128 | ret = _DoC_WaitReady(doc); | |
129 | ||
130 | /* issue 2 read from NOP register after reading from CDSNControl register | |
131 | see Software Requirement 11.4 item 2. */ | |
132 | DoC_Delay(doc, 2); | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | /* DoC_Command: Send a flash command to the flash chip through the CDSN Slow IO register to | |
138 | bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is | |
139 | required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */ | |
140 | ||
141 | static inline int DoC_Command(struct DiskOnChip *doc, unsigned char command, | |
142 | unsigned char xtraflags) | |
143 | { | |
144 | void __iomem *docptr = doc->virtadr; | |
145 | ||
146 | if (DoC_is_2000(doc)) | |
147 | xtraflags |= CDSN_CTRL_FLASH_IO; | |
148 | ||
149 | /* Assert the CLE (Command Latch Enable) line to the flash chip */ | |
150 | WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl); | |
151 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
152 | ||
153 | if (DoC_is_Millennium(doc)) | |
154 | WriteDOC(command, docptr, CDSNSlowIO); | |
155 | ||
156 | /* Send the command */ | |
157 | WriteDOC_(command, docptr, doc->ioreg); | |
158 | if (DoC_is_Millennium(doc)) | |
159 | WriteDOC(command, docptr, WritePipeTerm); | |
160 | ||
161 | /* Lower the CLE line */ | |
162 | WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl); | |
163 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
164 | ||
165 | /* Wait for the chip to respond - Software requirement 11.4.1 (extended for any command) */ | |
166 | return DoC_WaitReady(doc); | |
167 | } | |
168 | ||
169 | /* DoC_Address: Set the current address for the flash chip through the CDSN Slow IO register to | |
170 | bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is | |
171 | required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */ | |
172 | ||
173 | static int DoC_Address(struct DiskOnChip *doc, int numbytes, unsigned long ofs, | |
174 | unsigned char xtraflags1, unsigned char xtraflags2) | |
175 | { | |
176 | int i; | |
177 | void __iomem *docptr = doc->virtadr; | |
178 | ||
179 | if (DoC_is_2000(doc)) | |
180 | xtraflags1 |= CDSN_CTRL_FLASH_IO; | |
181 | ||
182 | /* Assert the ALE (Address Latch Enable) line to the flash chip */ | |
183 | WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl); | |
184 | ||
185 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
186 | ||
187 | /* Send the address */ | |
188 | /* Devices with 256-byte page are addressed as: | |
189 | Column (bits 0-7), Page (bits 8-15, 16-23, 24-31) | |
190 | * there is no device on the market with page256 | |
191 | and more than 24 bits. | |
192 | Devices with 512-byte page are addressed as: | |
193 | Column (bits 0-7), Page (bits 9-16, 17-24, 25-31) | |
194 | * 25-31 is sent only if the chip support it. | |
195 | * bit 8 changes the read command to be sent | |
196 | (NAND_CMD_READ0 or NAND_CMD_READ1). | |
197 | */ | |
198 | ||
199 | if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE) { | |
200 | if (DoC_is_Millennium(doc)) | |
201 | WriteDOC(ofs & 0xff, docptr, CDSNSlowIO); | |
202 | WriteDOC_(ofs & 0xff, docptr, doc->ioreg); | |
203 | } | |
204 | ||
205 | if (doc->page256) { | |
206 | ofs = ofs >> 8; | |
207 | } else { | |
208 | ofs = ofs >> 9; | |
209 | } | |
210 | ||
211 | if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE) { | |
212 | for (i = 0; i < doc->pageadrlen; i++, ofs = ofs >> 8) { | |
213 | if (DoC_is_Millennium(doc)) | |
214 | WriteDOC(ofs & 0xff, docptr, CDSNSlowIO); | |
215 | WriteDOC_(ofs & 0xff, docptr, doc->ioreg); | |
216 | } | |
217 | } | |
218 | ||
219 | if (DoC_is_Millennium(doc)) | |
220 | WriteDOC(ofs & 0xff, docptr, WritePipeTerm); | |
221 | ||
222 | DoC_Delay(doc, 2); /* Needed for some slow flash chips. mf. */ | |
223 | ||
224 | /* FIXME: The SlowIO's for millennium could be replaced by | |
225 | a single WritePipeTerm here. mf. */ | |
226 | ||
227 | /* Lower the ALE line */ | |
228 | WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, | |
229 | CDSNControl); | |
230 | ||
231 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
232 | ||
233 | /* Wait for the chip to respond - Software requirement 11.4.1 */ | |
234 | return DoC_WaitReady(doc); | |
235 | } | |
236 | ||
237 | /* Read a buffer from DoC, taking care of Millennium odditys */ | |
238 | static void DoC_ReadBuf(struct DiskOnChip *doc, u_char * buf, int len) | |
239 | { | |
240 | volatile int dummy; | |
241 | int modulus = 0xffff; | |
242 | void __iomem *docptr = doc->virtadr; | |
243 | int i; | |
244 | ||
245 | if (len <= 0) | |
246 | return; | |
247 | ||
248 | if (DoC_is_Millennium(doc)) { | |
249 | /* Read the data via the internal pipeline through CDSN IO register, | |
250 | see Pipelined Read Operations 11.3 */ | |
251 | dummy = ReadDOC(docptr, ReadPipeInit); | |
252 | ||
253 | /* Millennium should use the LastDataRead register - Pipeline Reads */ | |
254 | len--; | |
255 | ||
256 | /* This is needed for correctly ECC calculation */ | |
257 | modulus = 0xff; | |
258 | } | |
259 | ||
260 | for (i = 0; i < len; i++) | |
261 | buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus)); | |
262 | ||
263 | if (DoC_is_Millennium(doc)) { | |
264 | buf[i] = ReadDOC(docptr, LastDataRead); | |
265 | } | |
266 | } | |
267 | ||
268 | /* Write a buffer to DoC, taking care of Millennium odditys */ | |
269 | static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len) | |
270 | { | |
271 | void __iomem *docptr = doc->virtadr; | |
272 | int i; | |
273 | ||
274 | if (len <= 0) | |
275 | return; | |
276 | ||
277 | for (i = 0; i < len; i++) | |
278 | WriteDOC_(buf[i], docptr, doc->ioreg + i); | |
279 | ||
280 | if (DoC_is_Millennium(doc)) { | |
281 | WriteDOC(0x00, docptr, WritePipeTerm); | |
282 | } | |
283 | } | |
284 | ||
285 | ||
286 | /* DoC_SelectChip: Select a given flash chip within the current floor */ | |
287 | ||
288 | static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip) | |
289 | { | |
290 | void __iomem *docptr = doc->virtadr; | |
291 | ||
292 | /* Software requirement 11.4.4 before writing DeviceSelect */ | |
293 | /* Deassert the CE line to eliminate glitches on the FCE# outputs */ | |
294 | WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl); | |
295 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
296 | ||
297 | /* Select the individual flash chip requested */ | |
298 | WriteDOC(chip, docptr, CDSNDeviceSelect); | |
299 | DoC_Delay(doc, 4); | |
300 | ||
301 | /* Reassert the CE line */ | |
302 | WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr, | |
303 | CDSNControl); | |
304 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
305 | ||
306 | /* Wait for it to be ready */ | |
307 | return DoC_WaitReady(doc); | |
308 | } | |
309 | ||
310 | /* DoC_SelectFloor: Select a given floor (bank of flash chips) */ | |
311 | ||
312 | static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor) | |
313 | { | |
314 | void __iomem *docptr = doc->virtadr; | |
315 | ||
316 | /* Select the floor (bank) of chips required */ | |
317 | WriteDOC(floor, docptr, FloorSelect); | |
318 | ||
319 | /* Wait for the chip to be ready */ | |
320 | return DoC_WaitReady(doc); | |
321 | } | |
322 | ||
323 | /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */ | |
324 | ||
325 | static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip) | |
326 | { | |
327 | int mfr, id, i, j; | |
328 | volatile char dummy; | |
329 | ||
330 | /* Page in the required floor/chip */ | |
331 | DoC_SelectFloor(doc, floor); | |
332 | DoC_SelectChip(doc, chip); | |
333 | ||
334 | /* Reset the chip */ | |
335 | if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) { | |
336 | DEBUG(MTD_DEBUG_LEVEL2, | |
337 | "DoC_Command (reset) for %d,%d returned true\n", | |
338 | floor, chip); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | ||
343 | /* Read the NAND chip ID: 1. Send ReadID command */ | |
344 | if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) { | |
345 | DEBUG(MTD_DEBUG_LEVEL2, | |
346 | "DoC_Command (ReadID) for %d,%d returned true\n", | |
347 | floor, chip); | |
348 | return 0; | |
349 | } | |
350 | ||
351 | /* Read the NAND chip ID: 2. Send address byte zero */ | |
352 | DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0); | |
353 | ||
354 | /* Read the manufacturer and device id codes from the device */ | |
355 | ||
356 | if (DoC_is_Millennium(doc)) { | |
357 | DoC_Delay(doc, 2); | |
358 | dummy = ReadDOC(doc->virtadr, ReadPipeInit); | |
359 | mfr = ReadDOC(doc->virtadr, LastDataRead); | |
360 | ||
361 | DoC_Delay(doc, 2); | |
362 | dummy = ReadDOC(doc->virtadr, ReadPipeInit); | |
363 | id = ReadDOC(doc->virtadr, LastDataRead); | |
364 | } else { | |
365 | /* CDSN Slow IO register see Software Req 11.4 item 5. */ | |
366 | dummy = ReadDOC(doc->virtadr, CDSNSlowIO); | |
367 | DoC_Delay(doc, 2); | |
368 | mfr = ReadDOC_(doc->virtadr, doc->ioreg); | |
369 | ||
370 | /* CDSN Slow IO register see Software Req 11.4 item 5. */ | |
371 | dummy = ReadDOC(doc->virtadr, CDSNSlowIO); | |
372 | DoC_Delay(doc, 2); | |
373 | id = ReadDOC_(doc->virtadr, doc->ioreg); | |
374 | } | |
375 | ||
376 | /* No response - return failure */ | |
377 | if (mfr == 0xff || mfr == 0) | |
378 | return 0; | |
379 | ||
380 | /* Check it's the same as the first chip we identified. | |
381 | * M-Systems say that any given DiskOnChip device should only | |
382 | * contain _one_ type of flash part, although that's not a | |
383 | * hardware restriction. */ | |
384 | if (doc->mfr) { | |
385 | if (doc->mfr == mfr && doc->id == id) | |
386 | return 1; /* This is another the same the first */ | |
387 | else | |
388 | printk(KERN_WARNING | |
389 | "Flash chip at floor %d, chip %d is different:\n", | |
390 | floor, chip); | |
391 | } | |
392 | ||
393 | /* Print and store the manufacturer and ID codes. */ | |
394 | for (i = 0; nand_flash_ids[i].name != NULL; i++) { | |
395 | if (id == nand_flash_ids[i].id) { | |
396 | /* Try to identify manufacturer */ | |
397 | for (j = 0; nand_manuf_ids[j].id != 0x0; j++) { | |
398 | if (nand_manuf_ids[j].id == mfr) | |
399 | break; | |
400 | } | |
401 | printk(KERN_INFO | |
402 | "Flash chip found: Manufacturer ID: %2.2X, " | |
403 | "Chip ID: %2.2X (%s:%s)\n", mfr, id, | |
404 | nand_manuf_ids[j].name, nand_flash_ids[i].name); | |
405 | if (!doc->mfr) { | |
406 | doc->mfr = mfr; | |
407 | doc->id = id; | |
408 | doc->chipshift = | |
409 | ffs((nand_flash_ids[i].chipsize << 20)) - 1; | |
410 | doc->page256 = (nand_flash_ids[i].pagesize == 256) ? 1 : 0; | |
411 | doc->pageadrlen = doc->chipshift > 25 ? 3 : 2; | |
412 | doc->erasesize = | |
413 | nand_flash_ids[i].erasesize; | |
414 | return 1; | |
415 | } | |
416 | return 0; | |
417 | } | |
418 | } | |
419 | ||
420 | ||
421 | /* We haven't fully identified the chip. Print as much as we know. */ | |
422 | printk(KERN_WARNING "Unknown flash chip found: %2.2X %2.2X\n", | |
423 | id, mfr); | |
424 | ||
425 | printk(KERN_WARNING "Please report to dwmw2@infradead.org\n"); | |
426 | return 0; | |
427 | } | |
428 | ||
429 | /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */ | |
430 | ||
431 | static void DoC_ScanChips(struct DiskOnChip *this, int maxchips) | |
432 | { | |
433 | int floor, chip; | |
434 | int numchips[MAX_FLOORS]; | |
435 | int ret = 1; | |
436 | ||
437 | this->numchips = 0; | |
438 | this->mfr = 0; | |
439 | this->id = 0; | |
440 | ||
441 | /* For each floor, find the number of valid chips it contains */ | |
442 | for (floor = 0; floor < MAX_FLOORS; floor++) { | |
443 | ret = 1; | |
444 | numchips[floor] = 0; | |
445 | for (chip = 0; chip < maxchips && ret != 0; chip++) { | |
446 | ||
447 | ret = DoC_IdentChip(this, floor, chip); | |
448 | if (ret) { | |
449 | numchips[floor]++; | |
450 | this->numchips++; | |
451 | } | |
452 | } | |
453 | } | |
454 | ||
455 | /* If there are none at all that we recognise, bail */ | |
456 | if (!this->numchips) { | |
457 | printk(KERN_NOTICE "No flash chips recognised.\n"); | |
458 | return; | |
459 | } | |
460 | ||
461 | /* Allocate an array to hold the information for each chip */ | |
462 | this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL); | |
463 | if (!this->chips) { | |
464 | printk(KERN_NOTICE "No memory for allocating chip info structures\n"); | |
465 | return; | |
466 | } | |
467 | ||
468 | ret = 0; | |
469 | ||
470 | /* Fill out the chip array with {floor, chipno} for each | |
471 | * detected chip in the device. */ | |
472 | for (floor = 0; floor < MAX_FLOORS; floor++) { | |
473 | for (chip = 0; chip < numchips[floor]; chip++) { | |
474 | this->chips[ret].floor = floor; | |
475 | this->chips[ret].chip = chip; | |
476 | this->chips[ret].curadr = 0; | |
477 | this->chips[ret].curmode = 0x50; | |
478 | ret++; | |
479 | } | |
480 | } | |
481 | ||
482 | /* Calculate and print the total size of the device */ | |
483 | this->totlen = this->numchips * (1 << this->chipshift); | |
484 | ||
485 | printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n", | |
486 | this->numchips, this->totlen >> 20); | |
487 | } | |
488 | ||
489 | static int DoC2k_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2) | |
490 | { | |
491 | int tmp1, tmp2, retval; | |
492 | if (doc1->physadr == doc2->physadr) | |
493 | return 1; | |
494 | ||
495 | /* Use the alias resolution register which was set aside for this | |
496 | * purpose. If it's value is the same on both chips, they might | |
497 | * be the same chip, and we write to one and check for a change in | |
498 | * the other. It's unclear if this register is usuable in the | |
499 | * DoC 2000 (it's in the Millennium docs), but it seems to work. */ | |
500 | tmp1 = ReadDOC(doc1->virtadr, AliasResolution); | |
501 | tmp2 = ReadDOC(doc2->virtadr, AliasResolution); | |
502 | if (tmp1 != tmp2) | |
503 | return 0; | |
504 | ||
505 | WriteDOC((tmp1 + 1) % 0xff, doc1->virtadr, AliasResolution); | |
506 | tmp2 = ReadDOC(doc2->virtadr, AliasResolution); | |
507 | if (tmp2 == (tmp1 + 1) % 0xff) | |
508 | retval = 1; | |
509 | else | |
510 | retval = 0; | |
511 | ||
512 | /* Restore register contents. May not be necessary, but do it just to | |
513 | * be safe. */ | |
514 | WriteDOC(tmp1, doc1->virtadr, AliasResolution); | |
515 | ||
516 | return retval; | |
517 | } | |
518 | ||
519 | static const char im_name[] = "DoC2k_init"; | |
520 | ||
521 | /* This routine is made available to other mtd code via | |
522 | * inter_module_register. It must only be accessed through | |
523 | * inter_module_get which will bump the use count of this module. The | |
524 | * addresses passed back in mtd are valid as long as the use count of | |
525 | * this module is non-zero, i.e. between inter_module_get and | |
526 | * inter_module_put. Keith Owens <kaos@ocs.com.au> 29 Oct 2000. | |
527 | */ | |
528 | static void DoC2k_init(struct mtd_info *mtd) | |
529 | { | |
530 | struct DiskOnChip *this = mtd->priv; | |
531 | struct DiskOnChip *old = NULL; | |
532 | int maxchips; | |
533 | ||
534 | /* We must avoid being called twice for the same device. */ | |
535 | ||
536 | if (doc2klist) | |
537 | old = doc2klist->priv; | |
538 | ||
539 | while (old) { | |
540 | if (DoC2k_is_alias(old, this)) { | |
541 | printk(KERN_NOTICE | |
542 | "Ignoring DiskOnChip 2000 at 0x%lX - already configured\n", | |
543 | this->physadr); | |
544 | iounmap(this->virtadr); | |
545 | kfree(mtd); | |
546 | return; | |
547 | } | |
548 | if (old->nextdoc) | |
549 | old = old->nextdoc->priv; | |
550 | else | |
551 | old = NULL; | |
552 | } | |
553 | ||
554 | ||
555 | switch (this->ChipID) { | |
556 | case DOC_ChipID_Doc2kTSOP: | |
557 | mtd->name = "DiskOnChip 2000 TSOP"; | |
558 | this->ioreg = DoC_Mil_CDSN_IO; | |
559 | /* Pretend it's a Millennium */ | |
560 | this->ChipID = DOC_ChipID_DocMil; | |
561 | maxchips = MAX_CHIPS; | |
562 | break; | |
563 | case DOC_ChipID_Doc2k: | |
564 | mtd->name = "DiskOnChip 2000"; | |
565 | this->ioreg = DoC_2k_CDSN_IO; | |
566 | maxchips = MAX_CHIPS; | |
567 | break; | |
568 | case DOC_ChipID_DocMil: | |
569 | mtd->name = "DiskOnChip Millennium"; | |
570 | this->ioreg = DoC_Mil_CDSN_IO; | |
571 | maxchips = MAX_CHIPS_MIL; | |
572 | break; | |
573 | default: | |
574 | printk("Unknown ChipID 0x%02x\n", this->ChipID); | |
575 | kfree(mtd); | |
576 | iounmap(this->virtadr); | |
577 | return; | |
578 | } | |
579 | ||
580 | printk(KERN_NOTICE "%s found at address 0x%lX\n", mtd->name, | |
581 | this->physadr); | |
582 | ||
583 | mtd->type = MTD_NANDFLASH; | |
584 | mtd->flags = MTD_CAP_NANDFLASH; | |
585 | mtd->ecctype = MTD_ECC_RS_DiskOnChip; | |
586 | mtd->size = 0; | |
587 | mtd->erasesize = 0; | |
588 | mtd->oobblock = 512; | |
589 | mtd->oobsize = 16; | |
590 | mtd->owner = THIS_MODULE; | |
591 | mtd->erase = doc_erase; | |
592 | mtd->point = NULL; | |
593 | mtd->unpoint = NULL; | |
594 | mtd->read = doc_read; | |
595 | mtd->write = doc_write; | |
596 | mtd->read_ecc = doc_read_ecc; | |
597 | mtd->write_ecc = doc_write_ecc; | |
598 | mtd->writev_ecc = doc_writev_ecc; | |
599 | mtd->read_oob = doc_read_oob; | |
600 | mtd->write_oob = doc_write_oob; | |
601 | mtd->sync = NULL; | |
602 | ||
603 | this->totlen = 0; | |
604 | this->numchips = 0; | |
605 | ||
606 | this->curfloor = -1; | |
607 | this->curchip = -1; | |
608 | init_MUTEX(&this->lock); | |
609 | ||
610 | /* Ident all the chips present. */ | |
611 | DoC_ScanChips(this, maxchips); | |
612 | ||
613 | if (!this->totlen) { | |
614 | kfree(mtd); | |
615 | iounmap(this->virtadr); | |
616 | } else { | |
617 | this->nextdoc = doc2klist; | |
618 | doc2klist = mtd; | |
619 | mtd->size = this->totlen; | |
620 | mtd->erasesize = this->erasesize; | |
621 | add_mtd_device(mtd); | |
622 | return; | |
623 | } | |
624 | } | |
625 | ||
626 | static int doc_read(struct mtd_info *mtd, loff_t from, size_t len, | |
627 | size_t * retlen, u_char * buf) | |
628 | { | |
629 | /* Just a special case of doc_read_ecc */ | |
630 | return doc_read_ecc(mtd, from, len, retlen, buf, NULL, NULL); | |
631 | } | |
632 | ||
633 | static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, | |
634 | size_t * retlen, u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel) | |
635 | { | |
636 | struct DiskOnChip *this = mtd->priv; | |
637 | void __iomem *docptr = this->virtadr; | |
638 | struct Nand *mychip; | |
639 | unsigned char syndrome[6]; | |
640 | volatile char dummy; | |
641 | int i, len256 = 0, ret=0; | |
642 | size_t left = len; | |
643 | ||
644 | /* Don't allow read past end of device */ | |
645 | if (from >= this->totlen) | |
646 | return -EINVAL; | |
647 | ||
648 | down(&this->lock); | |
649 | ||
650 | *retlen = 0; | |
651 | while (left) { | |
652 | len = left; | |
653 | ||
654 | /* Don't allow a single read to cross a 512-byte block boundary */ | |
655 | if (from + len > ((from | 0x1ff) + 1)) | |
656 | len = ((from | 0x1ff) + 1) - from; | |
657 | ||
658 | /* The ECC will not be calculated correctly if less than 512 is read */ | |
659 | if (len != 0x200 && eccbuf) | |
660 | printk(KERN_WARNING | |
661 | "ECC needs a full sector read (adr: %lx size %lx)\n", | |
662 | (long) from, (long) len); | |
663 | ||
664 | /* printk("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len); */ | |
665 | ||
666 | ||
667 | /* Find the chip which is to be used and select it */ | |
668 | mychip = &this->chips[from >> (this->chipshift)]; | |
669 | ||
670 | if (this->curfloor != mychip->floor) { | |
671 | DoC_SelectFloor(this, mychip->floor); | |
672 | DoC_SelectChip(this, mychip->chip); | |
673 | } else if (this->curchip != mychip->chip) { | |
674 | DoC_SelectChip(this, mychip->chip); | |
675 | } | |
676 | ||
677 | this->curfloor = mychip->floor; | |
678 | this->curchip = mychip->chip; | |
679 | ||
680 | DoC_Command(this, | |
681 | (!this->page256 | |
682 | && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0, | |
683 | CDSN_CTRL_WP); | |
684 | DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP, | |
685 | CDSN_CTRL_ECC_IO); | |
686 | ||
687 | if (eccbuf) { | |
688 | /* Prime the ECC engine */ | |
689 | WriteDOC(DOC_ECC_RESET, docptr, ECCConf); | |
690 | WriteDOC(DOC_ECC_EN, docptr, ECCConf); | |
691 | } else { | |
692 | /* disable the ECC engine */ | |
693 | WriteDOC(DOC_ECC_RESET, docptr, ECCConf); | |
694 | WriteDOC(DOC_ECC_DIS, docptr, ECCConf); | |
695 | } | |
696 | ||
697 | /* treat crossing 256-byte sector for 2M x 8bits devices */ | |
698 | if (this->page256 && from + len > (from | 0xff) + 1) { | |
699 | len256 = (from | 0xff) + 1 - from; | |
700 | DoC_ReadBuf(this, buf, len256); | |
701 | ||
702 | DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP); | |
703 | DoC_Address(this, ADDR_COLUMN_PAGE, from + len256, | |
704 | CDSN_CTRL_WP, CDSN_CTRL_ECC_IO); | |
705 | } | |
706 | ||
707 | DoC_ReadBuf(this, &buf[len256], len - len256); | |
708 | ||
709 | /* Let the caller know we completed it */ | |
710 | *retlen += len; | |
711 | ||
712 | if (eccbuf) { | |
713 | /* Read the ECC data through the DiskOnChip ECC logic */ | |
714 | /* Note: this will work even with 2M x 8bit devices as */ | |
715 | /* they have 8 bytes of OOB per 256 page. mf. */ | |
716 | DoC_ReadBuf(this, eccbuf, 6); | |
717 | ||
718 | /* Flush the pipeline */ | |
719 | if (DoC_is_Millennium(this)) { | |
720 | dummy = ReadDOC(docptr, ECCConf); | |
721 | dummy = ReadDOC(docptr, ECCConf); | |
722 | i = ReadDOC(docptr, ECCConf); | |
723 | } else { | |
724 | dummy = ReadDOC(docptr, 2k_ECCStatus); | |
725 | dummy = ReadDOC(docptr, 2k_ECCStatus); | |
726 | i = ReadDOC(docptr, 2k_ECCStatus); | |
727 | } | |
728 | ||
729 | /* Check the ECC Status */ | |
730 | if (i & 0x80) { | |
731 | int nb_errors; | |
732 | /* There was an ECC error */ | |
733 | #ifdef ECC_DEBUG | |
734 | printk(KERN_ERR "DiskOnChip ECC Error: Read at %lx\n", (long)from); | |
735 | #endif | |
736 | /* Read the ECC syndrom through the DiskOnChip ECC logic. | |
737 | These syndrome will be all ZERO when there is no error */ | |
738 | for (i = 0; i < 6; i++) { | |
739 | syndrome[i] = | |
740 | ReadDOC(docptr, ECCSyndrome0 + i); | |
741 | } | |
742 | nb_errors = doc_decode_ecc(buf, syndrome); | |
743 | ||
744 | #ifdef ECC_DEBUG | |
745 | printk(KERN_ERR "Errors corrected: %x\n", nb_errors); | |
746 | #endif | |
747 | if (nb_errors < 0) { | |
748 | /* We return error, but have actually done the read. Not that | |
749 | this can be told to user-space, via sys_read(), but at least | |
750 | MTD-aware stuff can know about it by checking *retlen */ | |
751 | ret = -EIO; | |
752 | } | |
753 | } | |
754 | ||
755 | #ifdef PSYCHO_DEBUG | |
756 | printk(KERN_DEBUG "ECC DATA at %lxB: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", | |
757 | (long)from, eccbuf[0], eccbuf[1], eccbuf[2], | |
758 | eccbuf[3], eccbuf[4], eccbuf[5]); | |
759 | #endif | |
760 | ||
761 | /* disable the ECC engine */ | |
762 | WriteDOC(DOC_ECC_DIS, docptr , ECCConf); | |
763 | } | |
764 | ||
765 | /* according to 11.4.1, we need to wait for the busy line | |
766 | * drop if we read to the end of the page. */ | |
767 | if(0 == ((from + len) & 0x1ff)) | |
768 | { | |
769 | DoC_WaitReady(this); | |
770 | } | |
771 | ||
772 | from += len; | |
773 | left -= len; | |
774 | buf += len; | |
775 | } | |
776 | ||
777 | up(&this->lock); | |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
782 | static int doc_write(struct mtd_info *mtd, loff_t to, size_t len, | |
783 | size_t * retlen, const u_char * buf) | |
784 | { | |
785 | char eccbuf[6]; | |
786 | return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf, NULL); | |
787 | } | |
788 | ||
789 | static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len, | |
790 | size_t * retlen, const u_char * buf, | |
791 | u_char * eccbuf, struct nand_oobinfo *oobsel) | |
792 | { | |
793 | struct DiskOnChip *this = mtd->priv; | |
794 | int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */ | |
795 | void __iomem *docptr = this->virtadr; | |
796 | volatile char dummy; | |
797 | int len256 = 0; | |
798 | struct Nand *mychip; | |
799 | size_t left = len; | |
800 | int status; | |
801 | ||
802 | /* Don't allow write past end of device */ | |
803 | if (to >= this->totlen) | |
804 | return -EINVAL; | |
805 | ||
806 | down(&this->lock); | |
807 | ||
808 | *retlen = 0; | |
809 | while (left) { | |
810 | len = left; | |
811 | ||
812 | /* Don't allow a single write to cross a 512-byte block boundary */ | |
813 | if (to + len > ((to | 0x1ff) + 1)) | |
814 | len = ((to | 0x1ff) + 1) - to; | |
815 | ||
816 | /* The ECC will not be calculated correctly if less than 512 is written */ | |
817 | /* DBB- | |
818 | if (len != 0x200 && eccbuf) | |
819 | printk(KERN_WARNING | |
820 | "ECC needs a full sector write (adr: %lx size %lx)\n", | |
821 | (long) to, (long) len); | |
822 | -DBB */ | |
823 | ||
824 | /* printk("DoC_Write (adr: %lx size %lx)\n", (long) to, (long) len); */ | |
825 | ||
826 | /* Find the chip which is to be used and select it */ | |
827 | mychip = &this->chips[to >> (this->chipshift)]; | |
828 | ||
829 | if (this->curfloor != mychip->floor) { | |
830 | DoC_SelectFloor(this, mychip->floor); | |
831 | DoC_SelectChip(this, mychip->chip); | |
832 | } else if (this->curchip != mychip->chip) { | |
833 | DoC_SelectChip(this, mychip->chip); | |
834 | } | |
835 | ||
836 | this->curfloor = mychip->floor; | |
837 | this->curchip = mychip->chip; | |
838 | ||
839 | /* Set device to main plane of flash */ | |
840 | DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP); | |
841 | DoC_Command(this, | |
842 | (!this->page256 | |
843 | && (to & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0, | |
844 | CDSN_CTRL_WP); | |
845 | ||
846 | DoC_Command(this, NAND_CMD_SEQIN, 0); | |
847 | DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO); | |
848 | ||
849 | if (eccbuf) { | |
850 | /* Prime the ECC engine */ | |
851 | WriteDOC(DOC_ECC_RESET, docptr, ECCConf); | |
852 | WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf); | |
853 | } else { | |
854 | /* disable the ECC engine */ | |
855 | WriteDOC(DOC_ECC_RESET, docptr, ECCConf); | |
856 | WriteDOC(DOC_ECC_DIS, docptr, ECCConf); | |
857 | } | |
858 | ||
859 | /* treat crossing 256-byte sector for 2M x 8bits devices */ | |
860 | if (this->page256 && to + len > (to | 0xff) + 1) { | |
861 | len256 = (to | 0xff) + 1 - to; | |
862 | DoC_WriteBuf(this, buf, len256); | |
863 | ||
864 | DoC_Command(this, NAND_CMD_PAGEPROG, 0); | |
865 | ||
866 | DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); | |
867 | /* There's an implicit DoC_WaitReady() in DoC_Command */ | |
868 | ||
869 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
870 | DoC_Delay(this, 2); | |
871 | ||
872 | if (ReadDOC_(docptr, this->ioreg) & 1) { | |
873 | printk(KERN_ERR "Error programming flash\n"); | |
874 | /* Error in programming */ | |
875 | *retlen = 0; | |
876 | up(&this->lock); | |
877 | return -EIO; | |
878 | } | |
879 | ||
880 | DoC_Command(this, NAND_CMD_SEQIN, 0); | |
881 | DoC_Address(this, ADDR_COLUMN_PAGE, to + len256, 0, | |
882 | CDSN_CTRL_ECC_IO); | |
883 | } | |
884 | ||
885 | DoC_WriteBuf(this, &buf[len256], len - len256); | |
886 | ||
887 | if (eccbuf) { | |
888 | WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_CE, docptr, | |
889 | CDSNControl); | |
890 | ||
891 | if (DoC_is_Millennium(this)) { | |
892 | WriteDOC(0, docptr, NOP); | |
893 | WriteDOC(0, docptr, NOP); | |
894 | WriteDOC(0, docptr, NOP); | |
895 | } else { | |
896 | WriteDOC_(0, docptr, this->ioreg); | |
897 | WriteDOC_(0, docptr, this->ioreg); | |
898 | WriteDOC_(0, docptr, this->ioreg); | |
899 | } | |
900 | ||
901 | WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_FLASH_IO | CDSN_CTRL_CE, docptr, | |
902 | CDSNControl); | |
903 | ||
904 | /* Read the ECC data through the DiskOnChip ECC logic */ | |
905 | for (di = 0; di < 6; di++) { | |
906 | eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di); | |
907 | } | |
908 | ||
909 | /* Reset the ECC engine */ | |
910 | WriteDOC(DOC_ECC_DIS, docptr, ECCConf); | |
911 | ||
912 | #ifdef PSYCHO_DEBUG | |
913 | printk | |
914 | ("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", | |
915 | (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3], | |
916 | eccbuf[4], eccbuf[5]); | |
917 | #endif | |
918 | } | |
919 | ||
920 | DoC_Command(this, NAND_CMD_PAGEPROG, 0); | |
921 | ||
922 | DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); | |
923 | /* There's an implicit DoC_WaitReady() in DoC_Command */ | |
924 | ||
925 | if (DoC_is_Millennium(this)) { | |
926 | ReadDOC(docptr, ReadPipeInit); | |
927 | status = ReadDOC(docptr, LastDataRead); | |
928 | } else { | |
929 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
930 | DoC_Delay(this, 2); | |
931 | status = ReadDOC_(docptr, this->ioreg); | |
932 | } | |
933 | ||
934 | if (status & 1) { | |
935 | printk(KERN_ERR "Error programming flash\n"); | |
936 | /* Error in programming */ | |
937 | *retlen = 0; | |
938 | up(&this->lock); | |
939 | return -EIO; | |
940 | } | |
941 | ||
942 | /* Let the caller know we completed it */ | |
943 | *retlen += len; | |
944 | ||
945 | if (eccbuf) { | |
946 | unsigned char x[8]; | |
947 | size_t dummy; | |
948 | int ret; | |
949 | ||
950 | /* Write the ECC data to flash */ | |
951 | for (di=0; di<6; di++) | |
952 | x[di] = eccbuf[di]; | |
953 | ||
954 | x[6]=0x55; | |
955 | x[7]=0x55; | |
956 | ||
957 | ret = doc_write_oob_nolock(mtd, to, 8, &dummy, x); | |
958 | if (ret) { | |
959 | up(&this->lock); | |
960 | return ret; | |
961 | } | |
962 | } | |
963 | ||
964 | to += len; | |
965 | left -= len; | |
966 | buf += len; | |
967 | } | |
968 | ||
969 | up(&this->lock); | |
970 | return 0; | |
971 | } | |
972 | ||
973 | static int doc_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs, | |
974 | unsigned long count, loff_t to, size_t *retlen, | |
975 | u_char *eccbuf, struct nand_oobinfo *oobsel) | |
976 | { | |
977 | static char static_buf[512]; | |
978 | static DECLARE_MUTEX(writev_buf_sem); | |
979 | ||
980 | size_t totretlen = 0; | |
981 | size_t thisvecofs = 0; | |
982 | int ret= 0; | |
983 | ||
984 | down(&writev_buf_sem); | |
985 | ||
986 | while(count) { | |
987 | size_t thislen, thisretlen; | |
988 | unsigned char *buf; | |
989 | ||
990 | buf = vecs->iov_base + thisvecofs; | |
991 | thislen = vecs->iov_len - thisvecofs; | |
992 | ||
993 | ||
994 | if (thislen >= 512) { | |
995 | thislen = thislen & ~(512-1); | |
996 | thisvecofs += thislen; | |
997 | } else { | |
998 | /* Not enough to fill a page. Copy into buf */ | |
999 | memcpy(static_buf, buf, thislen); | |
1000 | buf = &static_buf[thislen]; | |
1001 | ||
1002 | while(count && thislen < 512) { | |
1003 | vecs++; | |
1004 | count--; | |
1005 | thisvecofs = min((512-thislen), vecs->iov_len); | |
1006 | memcpy(buf, vecs->iov_base, thisvecofs); | |
1007 | thislen += thisvecofs; | |
1008 | buf += thisvecofs; | |
1009 | } | |
1010 | buf = static_buf; | |
1011 | } | |
1012 | if (count && thisvecofs == vecs->iov_len) { | |
1013 | thisvecofs = 0; | |
1014 | vecs++; | |
1015 | count--; | |
1016 | } | |
1017 | ret = doc_write_ecc(mtd, to, thislen, &thisretlen, buf, eccbuf, oobsel); | |
1018 | ||
1019 | totretlen += thisretlen; | |
1020 | ||
1021 | if (ret || thisretlen != thislen) | |
1022 | break; | |
1023 | ||
1024 | to += thislen; | |
1025 | } | |
1026 | ||
1027 | up(&writev_buf_sem); | |
1028 | *retlen = totretlen; | |
1029 | return ret; | |
1030 | } | |
1031 | ||
1032 | ||
1033 | static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, size_t len, | |
1034 | size_t * retlen, u_char * buf) | |
1035 | { | |
1036 | struct DiskOnChip *this = mtd->priv; | |
1037 | int len256 = 0, ret; | |
1038 | struct Nand *mychip; | |
1039 | ||
1040 | down(&this->lock); | |
1041 | ||
1042 | mychip = &this->chips[ofs >> this->chipshift]; | |
1043 | ||
1044 | if (this->curfloor != mychip->floor) { | |
1045 | DoC_SelectFloor(this, mychip->floor); | |
1046 | DoC_SelectChip(this, mychip->chip); | |
1047 | } else if (this->curchip != mychip->chip) { | |
1048 | DoC_SelectChip(this, mychip->chip); | |
1049 | } | |
1050 | this->curfloor = mychip->floor; | |
1051 | this->curchip = mychip->chip; | |
1052 | ||
1053 | /* update address for 2M x 8bit devices. OOB starts on the second */ | |
1054 | /* page to maintain compatibility with doc_read_ecc. */ | |
1055 | if (this->page256) { | |
1056 | if (!(ofs & 0x8)) | |
1057 | ofs += 0x100; | |
1058 | else | |
1059 | ofs -= 0x8; | |
1060 | } | |
1061 | ||
1062 | DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); | |
1063 | DoC_Address(this, ADDR_COLUMN_PAGE, ofs, CDSN_CTRL_WP, 0); | |
1064 | ||
1065 | /* treat crossing 8-byte OOB data for 2M x 8bit devices */ | |
1066 | /* Note: datasheet says it should automaticaly wrap to the */ | |
1067 | /* next OOB block, but it didn't work here. mf. */ | |
1068 | if (this->page256 && ofs + len > (ofs | 0x7) + 1) { | |
1069 | len256 = (ofs | 0x7) + 1 - ofs; | |
1070 | DoC_ReadBuf(this, buf, len256); | |
1071 | ||
1072 | DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); | |
1073 | DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), | |
1074 | CDSN_CTRL_WP, 0); | |
1075 | } | |
1076 | ||
1077 | DoC_ReadBuf(this, &buf[len256], len - len256); | |
1078 | ||
1079 | *retlen = len; | |
1080 | /* Reading the full OOB data drops us off of the end of the page, | |
1081 | * causing the flash device to go into busy mode, so we need | |
1082 | * to wait until ready 11.4.1 and Toshiba TC58256FT docs */ | |
1083 | ||
1084 | ret = DoC_WaitReady(this); | |
1085 | ||
1086 | up(&this->lock); | |
1087 | return ret; | |
1088 | ||
1089 | } | |
1090 | ||
1091 | static int doc_write_oob_nolock(struct mtd_info *mtd, loff_t ofs, size_t len, | |
1092 | size_t * retlen, const u_char * buf) | |
1093 | { | |
1094 | struct DiskOnChip *this = mtd->priv; | |
1095 | int len256 = 0; | |
1096 | void __iomem *docptr = this->virtadr; | |
1097 | struct Nand *mychip = &this->chips[ofs >> this->chipshift]; | |
1098 | volatile int dummy; | |
1099 | int status; | |
1100 | ||
1101 | // printk("doc_write_oob(%lx, %d): %2.2X %2.2X %2.2X %2.2X ... %2.2X %2.2X .. %2.2X %2.2X\n",(long)ofs, len, | |
1102 | // buf[0], buf[1], buf[2], buf[3], buf[8], buf[9], buf[14],buf[15]); | |
1103 | ||
1104 | /* Find the chip which is to be used and select it */ | |
1105 | if (this->curfloor != mychip->floor) { | |
1106 | DoC_SelectFloor(this, mychip->floor); | |
1107 | DoC_SelectChip(this, mychip->chip); | |
1108 | } else if (this->curchip != mychip->chip) { | |
1109 | DoC_SelectChip(this, mychip->chip); | |
1110 | } | |
1111 | this->curfloor = mychip->floor; | |
1112 | this->curchip = mychip->chip; | |
1113 | ||
1114 | /* disable the ECC engine */ | |
1115 | WriteDOC (DOC_ECC_RESET, docptr, ECCConf); | |
1116 | WriteDOC (DOC_ECC_DIS, docptr, ECCConf); | |
1117 | ||
1118 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
1119 | DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP); | |
1120 | ||
1121 | /* issue the Read2 command to set the pointer to the Spare Data Area. */ | |
1122 | DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); | |
1123 | ||
1124 | /* update address for 2M x 8bit devices. OOB starts on the second */ | |
1125 | /* page to maintain compatibility with doc_read_ecc. */ | |
1126 | if (this->page256) { | |
1127 | if (!(ofs & 0x8)) | |
1128 | ofs += 0x100; | |
1129 | else | |
1130 | ofs -= 0x8; | |
1131 | } | |
1132 | ||
1133 | /* issue the Serial Data In command to initial the Page Program process */ | |
1134 | DoC_Command(this, NAND_CMD_SEQIN, 0); | |
1135 | DoC_Address(this, ADDR_COLUMN_PAGE, ofs, 0, 0); | |
1136 | ||
1137 | /* treat crossing 8-byte OOB data for 2M x 8bit devices */ | |
1138 | /* Note: datasheet says it should automaticaly wrap to the */ | |
1139 | /* next OOB block, but it didn't work here. mf. */ | |
1140 | if (this->page256 && ofs + len > (ofs | 0x7) + 1) { | |
1141 | len256 = (ofs | 0x7) + 1 - ofs; | |
1142 | DoC_WriteBuf(this, buf, len256); | |
1143 | ||
1144 | DoC_Command(this, NAND_CMD_PAGEPROG, 0); | |
1145 | DoC_Command(this, NAND_CMD_STATUS, 0); | |
1146 | /* DoC_WaitReady() is implicit in DoC_Command */ | |
1147 | ||
1148 | if (DoC_is_Millennium(this)) { | |
1149 | ReadDOC(docptr, ReadPipeInit); | |
1150 | status = ReadDOC(docptr, LastDataRead); | |
1151 | } else { | |
1152 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
1153 | DoC_Delay(this, 2); | |
1154 | status = ReadDOC_(docptr, this->ioreg); | |
1155 | } | |
1156 | ||
1157 | if (status & 1) { | |
1158 | printk(KERN_ERR "Error programming oob data\n"); | |
1159 | /* There was an error */ | |
1160 | *retlen = 0; | |
1161 | return -EIO; | |
1162 | } | |
1163 | DoC_Command(this, NAND_CMD_SEQIN, 0); | |
1164 | DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), 0, 0); | |
1165 | } | |
1166 | ||
1167 | DoC_WriteBuf(this, &buf[len256], len - len256); | |
1168 | ||
1169 | DoC_Command(this, NAND_CMD_PAGEPROG, 0); | |
1170 | DoC_Command(this, NAND_CMD_STATUS, 0); | |
1171 | /* DoC_WaitReady() is implicit in DoC_Command */ | |
1172 | ||
1173 | if (DoC_is_Millennium(this)) { | |
1174 | ReadDOC(docptr, ReadPipeInit); | |
1175 | status = ReadDOC(docptr, LastDataRead); | |
1176 | } else { | |
1177 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
1178 | DoC_Delay(this, 2); | |
1179 | status = ReadDOC_(docptr, this->ioreg); | |
1180 | } | |
1181 | ||
1182 | if (status & 1) { | |
1183 | printk(KERN_ERR "Error programming oob data\n"); | |
1184 | /* There was an error */ | |
1185 | *retlen = 0; | |
1186 | return -EIO; | |
1187 | } | |
1188 | ||
1189 | *retlen = len; | |
1190 | return 0; | |
1191 | ||
1192 | } | |
1193 | ||
1194 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, size_t len, | |
1195 | size_t * retlen, const u_char * buf) | |
1196 | { | |
1197 | struct DiskOnChip *this = mtd->priv; | |
1198 | int ret; | |
1199 | ||
1200 | down(&this->lock); | |
1201 | ret = doc_write_oob_nolock(mtd, ofs, len, retlen, buf); | |
1202 | ||
1203 | up(&this->lock); | |
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | static int doc_erase(struct mtd_info *mtd, struct erase_info *instr) | |
1208 | { | |
1209 | struct DiskOnChip *this = mtd->priv; | |
1210 | __u32 ofs = instr->addr; | |
1211 | __u32 len = instr->len; | |
1212 | volatile int dummy; | |
1213 | void __iomem *docptr = this->virtadr; | |
1214 | struct Nand *mychip; | |
1215 | int status; | |
1216 | ||
1217 | down(&this->lock); | |
1218 | ||
1219 | if (ofs & (mtd->erasesize-1) || len & (mtd->erasesize-1)) { | |
1220 | up(&this->lock); | |
1221 | return -EINVAL; | |
1222 | } | |
1223 | ||
1224 | instr->state = MTD_ERASING; | |
1225 | ||
1226 | /* FIXME: Do this in the background. Use timers or schedule_task() */ | |
1227 | while(len) { | |
1228 | mychip = &this->chips[ofs >> this->chipshift]; | |
1229 | ||
1230 | if (this->curfloor != mychip->floor) { | |
1231 | DoC_SelectFloor(this, mychip->floor); | |
1232 | DoC_SelectChip(this, mychip->chip); | |
1233 | } else if (this->curchip != mychip->chip) { | |
1234 | DoC_SelectChip(this, mychip->chip); | |
1235 | } | |
1236 | this->curfloor = mychip->floor; | |
1237 | this->curchip = mychip->chip; | |
1238 | ||
1239 | DoC_Command(this, NAND_CMD_ERASE1, 0); | |
1240 | DoC_Address(this, ADDR_PAGE, ofs, 0, 0); | |
1241 | DoC_Command(this, NAND_CMD_ERASE2, 0); | |
1242 | ||
1243 | DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); | |
1244 | ||
1245 | if (DoC_is_Millennium(this)) { | |
1246 | ReadDOC(docptr, ReadPipeInit); | |
1247 | status = ReadDOC(docptr, LastDataRead); | |
1248 | } else { | |
1249 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
1250 | DoC_Delay(this, 2); | |
1251 | status = ReadDOC_(docptr, this->ioreg); | |
1252 | } | |
1253 | ||
1254 | if (status & 1) { | |
1255 | printk(KERN_ERR "Error erasing at 0x%x\n", ofs); | |
1256 | /* There was an error */ | |
1257 | instr->state = MTD_ERASE_FAILED; | |
1258 | goto callback; | |
1259 | } | |
1260 | ofs += mtd->erasesize; | |
1261 | len -= mtd->erasesize; | |
1262 | } | |
1263 | instr->state = MTD_ERASE_DONE; | |
1264 | ||
1265 | callback: | |
1266 | mtd_erase_callback(instr); | |
1267 | ||
1268 | up(&this->lock); | |
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | ||
1273 | /**************************************************************************** | |
1274 | * | |
1275 | * Module stuff | |
1276 | * | |
1277 | ****************************************************************************/ | |
1278 | ||
1279 | static int __init init_doc2000(void) | |
1280 | { | |
1281 | inter_module_register(im_name, THIS_MODULE, &DoC2k_init); | |
1282 | return 0; | |
1283 | } | |
1284 | ||
1285 | static void __exit cleanup_doc2000(void) | |
1286 | { | |
1287 | struct mtd_info *mtd; | |
1288 | struct DiskOnChip *this; | |
1289 | ||
1290 | while ((mtd = doc2klist)) { | |
1291 | this = mtd->priv; | |
1292 | doc2klist = this->nextdoc; | |
1293 | ||
1294 | del_mtd_device(mtd); | |
1295 | ||
1296 | iounmap(this->virtadr); | |
1297 | kfree(this->chips); | |
1298 | kfree(mtd); | |
1299 | } | |
1300 | inter_module_unregister(im_name); | |
1301 | } | |
1302 | ||
1303 | module_exit(cleanup_doc2000); | |
1304 | module_init(init_doc2000); | |
1305 | ||
1306 | MODULE_LICENSE("GPL"); | |
1307 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al."); | |
1308 | MODULE_DESCRIPTION("MTD driver for DiskOnChip 2000 and Millennium"); | |
1309 |