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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 | * | |
e5580fbe | 7 | * $Id: doc2000.c,v 1.67 2005/11/07 11:14:24 gleixner Exp $ |
1da177e4 LT |
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> | |
1da177e4 LT |
16 | #include <linux/delay.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/bitops.h> | |
040d79f9 | 22 | #include <linux/mutex.h> |
1da177e4 LT |
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); | |
8593fbc6 TG |
57 | static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, |
58 | struct mtd_oob_ops *ops); | |
59 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, | |
60 | struct mtd_oob_ops *ops); | |
1da177e4 LT |
61 | static int doc_write_oob_nolock(struct mtd_info *mtd, loff_t ofs, size_t len, |
62 | size_t *retlen, const u_char *buf); | |
63 | static int doc_erase (struct mtd_info *mtd, struct erase_info *instr); | |
64 | ||
65 | static struct mtd_info *doc2klist = NULL; | |
66 | ||
67 | /* Perform the required delay cycles by reading from the appropriate register */ | |
68 | static void DoC_Delay(struct DiskOnChip *doc, unsigned short cycles) | |
69 | { | |
70 | volatile char dummy; | |
71 | int i; | |
e5580fbe | 72 | |
1da177e4 LT |
73 | for (i = 0; i < cycles; i++) { |
74 | if (DoC_is_Millennium(doc)) | |
75 | dummy = ReadDOC(doc->virtadr, NOP); | |
76 | else | |
77 | dummy = ReadDOC(doc->virtadr, DOCStatus); | |
78 | } | |
e5580fbe | 79 | |
1da177e4 LT |
80 | } |
81 | ||
82 | /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */ | |
83 | static int _DoC_WaitReady(struct DiskOnChip *doc) | |
84 | { | |
85 | void __iomem *docptr = doc->virtadr; | |
86 | unsigned long timeo = jiffies + (HZ * 10); | |
87 | ||
88 | DEBUG(MTD_DEBUG_LEVEL3, | |
89 | "_DoC_WaitReady called for out-of-line wait\n"); | |
90 | ||
91 | /* Out-of-line routine to wait for chip response */ | |
92 | while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) { | |
93 | /* issue 2 read from NOP register after reading from CDSNControl register | |
94 | see Software Requirement 11.4 item 2. */ | |
95 | DoC_Delay(doc, 2); | |
96 | ||
97 | if (time_after(jiffies, timeo)) { | |
98 | DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n"); | |
99 | return -EIO; | |
100 | } | |
101 | udelay(1); | |
102 | cond_resched(); | |
103 | } | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static inline int DoC_WaitReady(struct DiskOnChip *doc) | |
109 | { | |
110 | void __iomem *docptr = doc->virtadr; | |
111 | ||
112 | /* This is inline, to optimise the common case, where it's ready instantly */ | |
113 | int ret = 0; | |
114 | ||
115 | /* 4 read form NOP register should be issued in prior to the read from CDSNControl | |
116 | see Software Requirement 11.4 item 2. */ | |
117 | DoC_Delay(doc, 4); | |
118 | ||
119 | if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) | |
120 | /* Call the out-of-line routine to wait */ | |
121 | ret = _DoC_WaitReady(doc); | |
122 | ||
123 | /* issue 2 read from NOP register after reading from CDSNControl register | |
124 | see Software Requirement 11.4 item 2. */ | |
125 | DoC_Delay(doc, 2); | |
126 | ||
127 | return ret; | |
128 | } | |
129 | ||
130 | /* DoC_Command: Send a flash command to the flash chip through the CDSN Slow IO register to | |
131 | bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is | |
132 | required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */ | |
133 | ||
858119e1 | 134 | static int DoC_Command(struct DiskOnChip *doc, unsigned char command, |
1da177e4 LT |
135 | unsigned char xtraflags) |
136 | { | |
137 | void __iomem *docptr = doc->virtadr; | |
138 | ||
139 | if (DoC_is_2000(doc)) | |
140 | xtraflags |= CDSN_CTRL_FLASH_IO; | |
141 | ||
142 | /* Assert the CLE (Command Latch Enable) line to the flash chip */ | |
143 | WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl); | |
144 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
145 | ||
146 | if (DoC_is_Millennium(doc)) | |
147 | WriteDOC(command, docptr, CDSNSlowIO); | |
148 | ||
149 | /* Send the command */ | |
150 | WriteDOC_(command, docptr, doc->ioreg); | |
151 | if (DoC_is_Millennium(doc)) | |
152 | WriteDOC(command, docptr, WritePipeTerm); | |
153 | ||
154 | /* Lower the CLE line */ | |
155 | WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl); | |
156 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
157 | ||
158 | /* Wait for the chip to respond - Software requirement 11.4.1 (extended for any command) */ | |
159 | return DoC_WaitReady(doc); | |
160 | } | |
161 | ||
162 | /* DoC_Address: Set the current address for the flash chip through the CDSN Slow IO register to | |
163 | bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is | |
164 | required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */ | |
165 | ||
166 | static int DoC_Address(struct DiskOnChip *doc, int numbytes, unsigned long ofs, | |
167 | unsigned char xtraflags1, unsigned char xtraflags2) | |
168 | { | |
169 | int i; | |
170 | void __iomem *docptr = doc->virtadr; | |
171 | ||
172 | if (DoC_is_2000(doc)) | |
173 | xtraflags1 |= CDSN_CTRL_FLASH_IO; | |
174 | ||
175 | /* Assert the ALE (Address Latch Enable) line to the flash chip */ | |
176 | WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl); | |
177 | ||
178 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
179 | ||
180 | /* Send the address */ | |
181 | /* Devices with 256-byte page are addressed as: | |
182 | Column (bits 0-7), Page (bits 8-15, 16-23, 24-31) | |
183 | * there is no device on the market with page256 | |
184 | and more than 24 bits. | |
185 | Devices with 512-byte page are addressed as: | |
186 | Column (bits 0-7), Page (bits 9-16, 17-24, 25-31) | |
187 | * 25-31 is sent only if the chip support it. | |
188 | * bit 8 changes the read command to be sent | |
189 | (NAND_CMD_READ0 or NAND_CMD_READ1). | |
190 | */ | |
191 | ||
192 | if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE) { | |
193 | if (DoC_is_Millennium(doc)) | |
194 | WriteDOC(ofs & 0xff, docptr, CDSNSlowIO); | |
195 | WriteDOC_(ofs & 0xff, docptr, doc->ioreg); | |
196 | } | |
197 | ||
198 | if (doc->page256) { | |
199 | ofs = ofs >> 8; | |
200 | } else { | |
201 | ofs = ofs >> 9; | |
202 | } | |
203 | ||
204 | if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE) { | |
205 | for (i = 0; i < doc->pageadrlen; i++, ofs = ofs >> 8) { | |
206 | if (DoC_is_Millennium(doc)) | |
207 | WriteDOC(ofs & 0xff, docptr, CDSNSlowIO); | |
208 | WriteDOC_(ofs & 0xff, docptr, doc->ioreg); | |
209 | } | |
210 | } | |
211 | ||
212 | if (DoC_is_Millennium(doc)) | |
213 | WriteDOC(ofs & 0xff, docptr, WritePipeTerm); | |
214 | ||
215 | DoC_Delay(doc, 2); /* Needed for some slow flash chips. mf. */ | |
e5580fbe TG |
216 | |
217 | /* FIXME: The SlowIO's for millennium could be replaced by | |
1da177e4 LT |
218 | a single WritePipeTerm here. mf. */ |
219 | ||
220 | /* Lower the ALE line */ | |
221 | WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, | |
222 | CDSNControl); | |
223 | ||
224 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
225 | ||
226 | /* Wait for the chip to respond - Software requirement 11.4.1 */ | |
227 | return DoC_WaitReady(doc); | |
228 | } | |
229 | ||
230 | /* Read a buffer from DoC, taking care of Millennium odditys */ | |
231 | static void DoC_ReadBuf(struct DiskOnChip *doc, u_char * buf, int len) | |
232 | { | |
233 | volatile int dummy; | |
234 | int modulus = 0xffff; | |
235 | void __iomem *docptr = doc->virtadr; | |
236 | int i; | |
237 | ||
238 | if (len <= 0) | |
239 | return; | |
240 | ||
241 | if (DoC_is_Millennium(doc)) { | |
242 | /* Read the data via the internal pipeline through CDSN IO register, | |
243 | see Pipelined Read Operations 11.3 */ | |
244 | dummy = ReadDOC(docptr, ReadPipeInit); | |
245 | ||
246 | /* Millennium should use the LastDataRead register - Pipeline Reads */ | |
247 | len--; | |
248 | ||
249 | /* This is needed for correctly ECC calculation */ | |
250 | modulus = 0xff; | |
251 | } | |
252 | ||
253 | for (i = 0; i < len; i++) | |
254 | buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus)); | |
255 | ||
256 | if (DoC_is_Millennium(doc)) { | |
257 | buf[i] = ReadDOC(docptr, LastDataRead); | |
258 | } | |
259 | } | |
260 | ||
261 | /* Write a buffer to DoC, taking care of Millennium odditys */ | |
262 | static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len) | |
263 | { | |
264 | void __iomem *docptr = doc->virtadr; | |
265 | int i; | |
266 | ||
267 | if (len <= 0) | |
268 | return; | |
269 | ||
270 | for (i = 0; i < len; i++) | |
271 | WriteDOC_(buf[i], docptr, doc->ioreg + i); | |
272 | ||
273 | if (DoC_is_Millennium(doc)) { | |
274 | WriteDOC(0x00, docptr, WritePipeTerm); | |
275 | } | |
276 | } | |
277 | ||
278 | ||
279 | /* DoC_SelectChip: Select a given flash chip within the current floor */ | |
280 | ||
281 | static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip) | |
282 | { | |
283 | void __iomem *docptr = doc->virtadr; | |
284 | ||
285 | /* Software requirement 11.4.4 before writing DeviceSelect */ | |
286 | /* Deassert the CE line to eliminate glitches on the FCE# outputs */ | |
287 | WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl); | |
288 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
289 | ||
290 | /* Select the individual flash chip requested */ | |
291 | WriteDOC(chip, docptr, CDSNDeviceSelect); | |
292 | DoC_Delay(doc, 4); | |
293 | ||
294 | /* Reassert the CE line */ | |
295 | WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr, | |
296 | CDSNControl); | |
297 | DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ | |
298 | ||
299 | /* Wait for it to be ready */ | |
300 | return DoC_WaitReady(doc); | |
301 | } | |
302 | ||
303 | /* DoC_SelectFloor: Select a given floor (bank of flash chips) */ | |
304 | ||
305 | static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor) | |
306 | { | |
307 | void __iomem *docptr = doc->virtadr; | |
308 | ||
309 | /* Select the floor (bank) of chips required */ | |
310 | WriteDOC(floor, docptr, FloorSelect); | |
311 | ||
312 | /* Wait for the chip to be ready */ | |
313 | return DoC_WaitReady(doc); | |
314 | } | |
315 | ||
316 | /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */ | |
317 | ||
318 | static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip) | |
319 | { | |
320 | int mfr, id, i, j; | |
321 | volatile char dummy; | |
322 | ||
323 | /* Page in the required floor/chip */ | |
324 | DoC_SelectFloor(doc, floor); | |
325 | DoC_SelectChip(doc, chip); | |
326 | ||
327 | /* Reset the chip */ | |
328 | if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) { | |
329 | DEBUG(MTD_DEBUG_LEVEL2, | |
330 | "DoC_Command (reset) for %d,%d returned true\n", | |
331 | floor, chip); | |
332 | return 0; | |
333 | } | |
334 | ||
335 | ||
336 | /* Read the NAND chip ID: 1. Send ReadID command */ | |
337 | if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) { | |
338 | DEBUG(MTD_DEBUG_LEVEL2, | |
339 | "DoC_Command (ReadID) for %d,%d returned true\n", | |
340 | floor, chip); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | /* Read the NAND chip ID: 2. Send address byte zero */ | |
345 | DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0); | |
346 | ||
347 | /* Read the manufacturer and device id codes from the device */ | |
348 | ||
349 | if (DoC_is_Millennium(doc)) { | |
350 | DoC_Delay(doc, 2); | |
351 | dummy = ReadDOC(doc->virtadr, ReadPipeInit); | |
352 | mfr = ReadDOC(doc->virtadr, LastDataRead); | |
353 | ||
354 | DoC_Delay(doc, 2); | |
355 | dummy = ReadDOC(doc->virtadr, ReadPipeInit); | |
356 | id = ReadDOC(doc->virtadr, LastDataRead); | |
357 | } else { | |
358 | /* CDSN Slow IO register see Software Req 11.4 item 5. */ | |
359 | dummy = ReadDOC(doc->virtadr, CDSNSlowIO); | |
360 | DoC_Delay(doc, 2); | |
361 | mfr = ReadDOC_(doc->virtadr, doc->ioreg); | |
362 | ||
363 | /* CDSN Slow IO register see Software Req 11.4 item 5. */ | |
364 | dummy = ReadDOC(doc->virtadr, CDSNSlowIO); | |
365 | DoC_Delay(doc, 2); | |
366 | id = ReadDOC_(doc->virtadr, doc->ioreg); | |
367 | } | |
368 | ||
369 | /* No response - return failure */ | |
370 | if (mfr == 0xff || mfr == 0) | |
371 | return 0; | |
372 | ||
e5580fbe | 373 | /* Check it's the same as the first chip we identified. |
1da177e4 | 374 | * M-Systems say that any given DiskOnChip device should only |
e5580fbe | 375 | * contain _one_ type of flash part, although that's not a |
1da177e4 LT |
376 | * hardware restriction. */ |
377 | if (doc->mfr) { | |
378 | if (doc->mfr == mfr && doc->id == id) | |
379 | return 1; /* This is another the same the first */ | |
380 | else | |
381 | printk(KERN_WARNING | |
382 | "Flash chip at floor %d, chip %d is different:\n", | |
383 | floor, chip); | |
384 | } | |
385 | ||
386 | /* Print and store the manufacturer and ID codes. */ | |
387 | for (i = 0; nand_flash_ids[i].name != NULL; i++) { | |
388 | if (id == nand_flash_ids[i].id) { | |
389 | /* Try to identify manufacturer */ | |
390 | for (j = 0; nand_manuf_ids[j].id != 0x0; j++) { | |
391 | if (nand_manuf_ids[j].id == mfr) | |
392 | break; | |
e5580fbe | 393 | } |
1da177e4 LT |
394 | printk(KERN_INFO |
395 | "Flash chip found: Manufacturer ID: %2.2X, " | |
396 | "Chip ID: %2.2X (%s:%s)\n", mfr, id, | |
397 | nand_manuf_ids[j].name, nand_flash_ids[i].name); | |
398 | if (!doc->mfr) { | |
399 | doc->mfr = mfr; | |
400 | doc->id = id; | |
e5580fbe | 401 | doc->chipshift = |
1da177e4 LT |
402 | ffs((nand_flash_ids[i].chipsize << 20)) - 1; |
403 | doc->page256 = (nand_flash_ids[i].pagesize == 256) ? 1 : 0; | |
404 | doc->pageadrlen = doc->chipshift > 25 ? 3 : 2; | |
405 | doc->erasesize = | |
406 | nand_flash_ids[i].erasesize; | |
407 | return 1; | |
408 | } | |
409 | return 0; | |
410 | } | |
411 | } | |
412 | ||
413 | ||
414 | /* We haven't fully identified the chip. Print as much as we know. */ | |
415 | printk(KERN_WARNING "Unknown flash chip found: %2.2X %2.2X\n", | |
416 | id, mfr); | |
417 | ||
418 | printk(KERN_WARNING "Please report to dwmw2@infradead.org\n"); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */ | |
423 | ||
424 | static void DoC_ScanChips(struct DiskOnChip *this, int maxchips) | |
425 | { | |
426 | int floor, chip; | |
427 | int numchips[MAX_FLOORS]; | |
428 | int ret = 1; | |
429 | ||
430 | this->numchips = 0; | |
431 | this->mfr = 0; | |
432 | this->id = 0; | |
433 | ||
434 | /* For each floor, find the number of valid chips it contains */ | |
435 | for (floor = 0; floor < MAX_FLOORS; floor++) { | |
436 | ret = 1; | |
437 | numchips[floor] = 0; | |
438 | for (chip = 0; chip < maxchips && ret != 0; chip++) { | |
439 | ||
440 | ret = DoC_IdentChip(this, floor, chip); | |
441 | if (ret) { | |
442 | numchips[floor]++; | |
443 | this->numchips++; | |
444 | } | |
445 | } | |
446 | } | |
447 | ||
448 | /* If there are none at all that we recognise, bail */ | |
449 | if (!this->numchips) { | |
450 | printk(KERN_NOTICE "No flash chips recognised.\n"); | |
451 | return; | |
452 | } | |
453 | ||
454 | /* Allocate an array to hold the information for each chip */ | |
455 | this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL); | |
456 | if (!this->chips) { | |
457 | printk(KERN_NOTICE "No memory for allocating chip info structures\n"); | |
458 | return; | |
459 | } | |
460 | ||
461 | ret = 0; | |
462 | ||
e5580fbe | 463 | /* Fill out the chip array with {floor, chipno} for each |
1da177e4 LT |
464 | * detected chip in the device. */ |
465 | for (floor = 0; floor < MAX_FLOORS; floor++) { | |
466 | for (chip = 0; chip < numchips[floor]; chip++) { | |
467 | this->chips[ret].floor = floor; | |
468 | this->chips[ret].chip = chip; | |
469 | this->chips[ret].curadr = 0; | |
470 | this->chips[ret].curmode = 0x50; | |
471 | ret++; | |
472 | } | |
473 | } | |
474 | ||
475 | /* Calculate and print the total size of the device */ | |
476 | this->totlen = this->numchips * (1 << this->chipshift); | |
477 | ||
478 | printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n", | |
479 | this->numchips, this->totlen >> 20); | |
480 | } | |
481 | ||
482 | static int DoC2k_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2) | |
483 | { | |
484 | int tmp1, tmp2, retval; | |
485 | if (doc1->physadr == doc2->physadr) | |
486 | return 1; | |
487 | ||
488 | /* Use the alias resolution register which was set aside for this | |
489 | * purpose. If it's value is the same on both chips, they might | |
490 | * be the same chip, and we write to one and check for a change in | |
491 | * the other. It's unclear if this register is usuable in the | |
492 | * DoC 2000 (it's in the Millennium docs), but it seems to work. */ | |
493 | tmp1 = ReadDOC(doc1->virtadr, AliasResolution); | |
494 | tmp2 = ReadDOC(doc2->virtadr, AliasResolution); | |
495 | if (tmp1 != tmp2) | |
496 | return 0; | |
497 | ||
498 | WriteDOC((tmp1 + 1) % 0xff, doc1->virtadr, AliasResolution); | |
499 | tmp2 = ReadDOC(doc2->virtadr, AliasResolution); | |
500 | if (tmp2 == (tmp1 + 1) % 0xff) | |
501 | retval = 1; | |
502 | else | |
503 | retval = 0; | |
504 | ||
505 | /* Restore register contents. May not be necessary, but do it just to | |
506 | * be safe. */ | |
507 | WriteDOC(tmp1, doc1->virtadr, AliasResolution); | |
508 | ||
509 | return retval; | |
510 | } | |
511 | ||
5e535429 DW |
512 | /* This routine is found from the docprobe code by symbol_get(), |
513 | * which will bump the use count of this module. */ | |
514 | void DoC2k_init(struct mtd_info *mtd) | |
1da177e4 LT |
515 | { |
516 | struct DiskOnChip *this = mtd->priv; | |
517 | struct DiskOnChip *old = NULL; | |
518 | int maxchips; | |
519 | ||
520 | /* We must avoid being called twice for the same device. */ | |
521 | ||
522 | if (doc2klist) | |
523 | old = doc2klist->priv; | |
524 | ||
525 | while (old) { | |
526 | if (DoC2k_is_alias(old, this)) { | |
527 | printk(KERN_NOTICE | |
528 | "Ignoring DiskOnChip 2000 at 0x%lX - already configured\n", | |
529 | this->physadr); | |
530 | iounmap(this->virtadr); | |
531 | kfree(mtd); | |
532 | return; | |
533 | } | |
534 | if (old->nextdoc) | |
535 | old = old->nextdoc->priv; | |
536 | else | |
537 | old = NULL; | |
538 | } | |
539 | ||
540 | ||
541 | switch (this->ChipID) { | |
542 | case DOC_ChipID_Doc2kTSOP: | |
543 | mtd->name = "DiskOnChip 2000 TSOP"; | |
544 | this->ioreg = DoC_Mil_CDSN_IO; | |
545 | /* Pretend it's a Millennium */ | |
546 | this->ChipID = DOC_ChipID_DocMil; | |
547 | maxchips = MAX_CHIPS; | |
548 | break; | |
549 | case DOC_ChipID_Doc2k: | |
550 | mtd->name = "DiskOnChip 2000"; | |
551 | this->ioreg = DoC_2k_CDSN_IO; | |
552 | maxchips = MAX_CHIPS; | |
553 | break; | |
554 | case DOC_ChipID_DocMil: | |
555 | mtd->name = "DiskOnChip Millennium"; | |
556 | this->ioreg = DoC_Mil_CDSN_IO; | |
557 | maxchips = MAX_CHIPS_MIL; | |
558 | break; | |
559 | default: | |
560 | printk("Unknown ChipID 0x%02x\n", this->ChipID); | |
561 | kfree(mtd); | |
562 | iounmap(this->virtadr); | |
563 | return; | |
564 | } | |
565 | ||
566 | printk(KERN_NOTICE "%s found at address 0x%lX\n", mtd->name, | |
567 | this->physadr); | |
568 | ||
569 | mtd->type = MTD_NANDFLASH; | |
570 | mtd->flags = MTD_CAP_NANDFLASH; | |
1da177e4 LT |
571 | mtd->size = 0; |
572 | mtd->erasesize = 0; | |
28318776 | 573 | mtd->writesize = 512; |
1da177e4 LT |
574 | mtd->oobsize = 16; |
575 | mtd->owner = THIS_MODULE; | |
576 | mtd->erase = doc_erase; | |
577 | mtd->point = NULL; | |
578 | mtd->unpoint = NULL; | |
579 | mtd->read = doc_read; | |
580 | mtd->write = doc_write; | |
1da177e4 LT |
581 | mtd->read_oob = doc_read_oob; |
582 | mtd->write_oob = doc_write_oob; | |
583 | mtd->sync = NULL; | |
584 | ||
585 | this->totlen = 0; | |
586 | this->numchips = 0; | |
587 | ||
588 | this->curfloor = -1; | |
589 | this->curchip = -1; | |
48b19268 | 590 | mutex_init(&this->lock); |
1da177e4 LT |
591 | |
592 | /* Ident all the chips present. */ | |
593 | DoC_ScanChips(this, maxchips); | |
594 | ||
595 | if (!this->totlen) { | |
596 | kfree(mtd); | |
597 | iounmap(this->virtadr); | |
598 | } else { | |
599 | this->nextdoc = doc2klist; | |
600 | doc2klist = mtd; | |
601 | mtd->size = this->totlen; | |
602 | mtd->erasesize = this->erasesize; | |
603 | add_mtd_device(mtd); | |
604 | return; | |
605 | } | |
606 | } | |
5e535429 | 607 | EXPORT_SYMBOL_GPL(DoC2k_init); |
1da177e4 LT |
608 | |
609 | static int doc_read(struct mtd_info *mtd, loff_t from, size_t len, | |
610 | size_t * retlen, u_char * buf) | |
1da177e4 LT |
611 | { |
612 | struct DiskOnChip *this = mtd->priv; | |
613 | void __iomem *docptr = this->virtadr; | |
614 | struct Nand *mychip; | |
7f8a8940 | 615 | unsigned char syndrome[6], eccbuf[6]; |
1da177e4 LT |
616 | volatile char dummy; |
617 | int i, len256 = 0, ret=0; | |
618 | size_t left = len; | |
619 | ||
620 | /* Don't allow read past end of device */ | |
621 | if (from >= this->totlen) | |
622 | return -EINVAL; | |
623 | ||
48b19268 | 624 | mutex_lock(&this->lock); |
1da177e4 LT |
625 | |
626 | *retlen = 0; | |
627 | while (left) { | |
628 | len = left; | |
629 | ||
630 | /* Don't allow a single read to cross a 512-byte block boundary */ | |
631 | if (from + len > ((from | 0x1ff) + 1)) | |
632 | len = ((from | 0x1ff) + 1) - from; | |
633 | ||
634 | /* The ECC will not be calculated correctly if less than 512 is read */ | |
635 | if (len != 0x200 && eccbuf) | |
636 | printk(KERN_WARNING | |
637 | "ECC needs a full sector read (adr: %lx size %lx)\n", | |
638 | (long) from, (long) len); | |
639 | ||
640 | /* printk("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len); */ | |
641 | ||
642 | ||
643 | /* Find the chip which is to be used and select it */ | |
644 | mychip = &this->chips[from >> (this->chipshift)]; | |
645 | ||
646 | if (this->curfloor != mychip->floor) { | |
647 | DoC_SelectFloor(this, mychip->floor); | |
648 | DoC_SelectChip(this, mychip->chip); | |
649 | } else if (this->curchip != mychip->chip) { | |
650 | DoC_SelectChip(this, mychip->chip); | |
651 | } | |
652 | ||
653 | this->curfloor = mychip->floor; | |
654 | this->curchip = mychip->chip; | |
655 | ||
656 | DoC_Command(this, | |
657 | (!this->page256 | |
658 | && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0, | |
659 | CDSN_CTRL_WP); | |
660 | DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP, | |
661 | CDSN_CTRL_ECC_IO); | |
662 | ||
7f8a8940 TG |
663 | /* Prime the ECC engine */ |
664 | WriteDOC(DOC_ECC_RESET, docptr, ECCConf); | |
665 | WriteDOC(DOC_ECC_EN, docptr, ECCConf); | |
1da177e4 LT |
666 | |
667 | /* treat crossing 256-byte sector for 2M x 8bits devices */ | |
668 | if (this->page256 && from + len > (from | 0xff) + 1) { | |
669 | len256 = (from | 0xff) + 1 - from; | |
670 | DoC_ReadBuf(this, buf, len256); | |
671 | ||
672 | DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP); | |
673 | DoC_Address(this, ADDR_COLUMN_PAGE, from + len256, | |
674 | CDSN_CTRL_WP, CDSN_CTRL_ECC_IO); | |
675 | } | |
676 | ||
677 | DoC_ReadBuf(this, &buf[len256], len - len256); | |
678 | ||
679 | /* Let the caller know we completed it */ | |
680 | *retlen += len; | |
681 | ||
7f8a8940 TG |
682 | /* Read the ECC data through the DiskOnChip ECC logic */ |
683 | /* Note: this will work even with 2M x 8bit devices as */ | |
684 | /* they have 8 bytes of OOB per 256 page. mf. */ | |
685 | DoC_ReadBuf(this, eccbuf, 6); | |
686 | ||
687 | /* Flush the pipeline */ | |
688 | if (DoC_is_Millennium(this)) { | |
689 | dummy = ReadDOC(docptr, ECCConf); | |
690 | dummy = ReadDOC(docptr, ECCConf); | |
691 | i = ReadDOC(docptr, ECCConf); | |
692 | } else { | |
693 | dummy = ReadDOC(docptr, 2k_ECCStatus); | |
694 | dummy = ReadDOC(docptr, 2k_ECCStatus); | |
695 | i = ReadDOC(docptr, 2k_ECCStatus); | |
696 | } | |
1da177e4 | 697 | |
7f8a8940 TG |
698 | /* Check the ECC Status */ |
699 | if (i & 0x80) { | |
700 | int nb_errors; | |
701 | /* There was an ECC error */ | |
1da177e4 | 702 | #ifdef ECC_DEBUG |
7f8a8940 | 703 | printk(KERN_ERR "DiskOnChip ECC Error: Read at %lx\n", (long)from); |
1da177e4 | 704 | #endif |
7f8a8940 TG |
705 | /* Read the ECC syndrom through the DiskOnChip ECC |
706 | logic. These syndrome will be all ZERO when there | |
707 | is no error */ | |
708 | for (i = 0; i < 6; i++) { | |
709 | syndrome[i] = | |
710 | ReadDOC(docptr, ECCSyndrome0 + i); | |
711 | } | |
712 | nb_errors = doc_decode_ecc(buf, syndrome); | |
1da177e4 LT |
713 | |
714 | #ifdef ECC_DEBUG | |
7f8a8940 | 715 | printk(KERN_ERR "Errors corrected: %x\n", nb_errors); |
1da177e4 | 716 | #endif |
7f8a8940 TG |
717 | if (nb_errors < 0) { |
718 | /* We return error, but have actually done the | |
719 | read. Not that this can be told to | |
720 | user-space, via sys_read(), but at least | |
721 | MTD-aware stuff can know about it by | |
722 | checking *retlen */ | |
723 | ret = -EIO; | |
1da177e4 | 724 | } |
7f8a8940 | 725 | } |
1da177e4 LT |
726 | |
727 | #ifdef PSYCHO_DEBUG | |
7f8a8940 TG |
728 | printk(KERN_DEBUG "ECC DATA at %lxB: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", |
729 | (long)from, eccbuf[0], eccbuf[1], eccbuf[2], | |
730 | eccbuf[3], eccbuf[4], eccbuf[5]); | |
1da177e4 | 731 | #endif |
e5580fbe | 732 | |
7f8a8940 TG |
733 | /* disable the ECC engine */ |
734 | WriteDOC(DOC_ECC_DIS, docptr , ECCConf); | |
1da177e4 | 735 | |
e5580fbe | 736 | /* according to 11.4.1, we need to wait for the busy line |
1da177e4 LT |
737 | * drop if we read to the end of the page. */ |
738 | if(0 == ((from + len) & 0x1ff)) | |
739 | { | |
740 | DoC_WaitReady(this); | |
741 | } | |
742 | ||
743 | from += len; | |
744 | left -= len; | |
745 | buf += len; | |
746 | } | |
747 | ||
48b19268 | 748 | mutex_unlock(&this->lock); |
1da177e4 LT |
749 | |
750 | return ret; | |
751 | } | |
752 | ||
753 | static int doc_write(struct mtd_info *mtd, loff_t to, size_t len, | |
754 | size_t * retlen, const u_char * buf) | |
1da177e4 LT |
755 | { |
756 | struct DiskOnChip *this = mtd->priv; | |
757 | int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */ | |
758 | void __iomem *docptr = this->virtadr; | |
7f8a8940 | 759 | unsigned char eccbuf[6]; |
1da177e4 LT |
760 | volatile char dummy; |
761 | int len256 = 0; | |
762 | struct Nand *mychip; | |
763 | size_t left = len; | |
764 | int status; | |
765 | ||
766 | /* Don't allow write past end of device */ | |
767 | if (to >= this->totlen) | |
768 | return -EINVAL; | |
769 | ||
48b19268 | 770 | mutex_lock(&this->lock); |
1da177e4 LT |
771 | |
772 | *retlen = 0; | |
773 | while (left) { | |
774 | len = left; | |
775 | ||
776 | /* Don't allow a single write to cross a 512-byte block boundary */ | |
777 | if (to + len > ((to | 0x1ff) + 1)) | |
778 | len = ((to | 0x1ff) + 1) - to; | |
779 | ||
780 | /* The ECC will not be calculated correctly if less than 512 is written */ | |
781 | /* DBB- | |
782 | if (len != 0x200 && eccbuf) | |
783 | printk(KERN_WARNING | |
784 | "ECC needs a full sector write (adr: %lx size %lx)\n", | |
785 | (long) to, (long) len); | |
786 | -DBB */ | |
787 | ||
788 | /* printk("DoC_Write (adr: %lx size %lx)\n", (long) to, (long) len); */ | |
789 | ||
790 | /* Find the chip which is to be used and select it */ | |
791 | mychip = &this->chips[to >> (this->chipshift)]; | |
792 | ||
793 | if (this->curfloor != mychip->floor) { | |
794 | DoC_SelectFloor(this, mychip->floor); | |
795 | DoC_SelectChip(this, mychip->chip); | |
796 | } else if (this->curchip != mychip->chip) { | |
797 | DoC_SelectChip(this, mychip->chip); | |
798 | } | |
799 | ||
800 | this->curfloor = mychip->floor; | |
801 | this->curchip = mychip->chip; | |
802 | ||
803 | /* Set device to main plane of flash */ | |
804 | DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP); | |
805 | DoC_Command(this, | |
806 | (!this->page256 | |
807 | && (to & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0, | |
808 | CDSN_CTRL_WP); | |
809 | ||
810 | DoC_Command(this, NAND_CMD_SEQIN, 0); | |
811 | DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO); | |
812 | ||
7f8a8940 TG |
813 | /* Prime the ECC engine */ |
814 | WriteDOC(DOC_ECC_RESET, docptr, ECCConf); | |
815 | WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf); | |
1da177e4 LT |
816 | |
817 | /* treat crossing 256-byte sector for 2M x 8bits devices */ | |
818 | if (this->page256 && to + len > (to | 0xff) + 1) { | |
819 | len256 = (to | 0xff) + 1 - to; | |
820 | DoC_WriteBuf(this, buf, len256); | |
821 | ||
822 | DoC_Command(this, NAND_CMD_PAGEPROG, 0); | |
823 | ||
824 | DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); | |
825 | /* There's an implicit DoC_WaitReady() in DoC_Command */ | |
826 | ||
827 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
828 | DoC_Delay(this, 2); | |
829 | ||
830 | if (ReadDOC_(docptr, this->ioreg) & 1) { | |
831 | printk(KERN_ERR "Error programming flash\n"); | |
832 | /* Error in programming */ | |
833 | *retlen = 0; | |
48b19268 | 834 | mutex_unlock(&this->lock); |
1da177e4 LT |
835 | return -EIO; |
836 | } | |
837 | ||
838 | DoC_Command(this, NAND_CMD_SEQIN, 0); | |
839 | DoC_Address(this, ADDR_COLUMN_PAGE, to + len256, 0, | |
840 | CDSN_CTRL_ECC_IO); | |
841 | } | |
842 | ||
843 | DoC_WriteBuf(this, &buf[len256], len - len256); | |
844 | ||
7f8a8940 | 845 | WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_CE, docptr, CDSNControl); |
1da177e4 | 846 | |
7f8a8940 TG |
847 | if (DoC_is_Millennium(this)) { |
848 | WriteDOC(0, docptr, NOP); | |
849 | WriteDOC(0, docptr, NOP); | |
850 | WriteDOC(0, docptr, NOP); | |
851 | } else { | |
852 | WriteDOC_(0, docptr, this->ioreg); | |
853 | WriteDOC_(0, docptr, this->ioreg); | |
854 | WriteDOC_(0, docptr, this->ioreg); | |
855 | } | |
1da177e4 | 856 | |
7f8a8940 TG |
857 | WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_FLASH_IO | CDSN_CTRL_CE, docptr, |
858 | CDSNControl); | |
859 | ||
860 | /* Read the ECC data through the DiskOnChip ECC logic */ | |
861 | for (di = 0; di < 6; di++) { | |
862 | eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di); | |
863 | } | |
1da177e4 | 864 | |
7f8a8940 TG |
865 | /* Reset the ECC engine */ |
866 | WriteDOC(DOC_ECC_DIS, docptr, ECCConf); | |
1da177e4 LT |
867 | |
868 | #ifdef PSYCHO_DEBUG | |
7f8a8940 TG |
869 | printk |
870 | ("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", | |
871 | (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3], | |
872 | eccbuf[4], eccbuf[5]); | |
1da177e4 | 873 | #endif |
1da177e4 LT |
874 | DoC_Command(this, NAND_CMD_PAGEPROG, 0); |
875 | ||
876 | DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); | |
877 | /* There's an implicit DoC_WaitReady() in DoC_Command */ | |
878 | ||
879 | if (DoC_is_Millennium(this)) { | |
880 | ReadDOC(docptr, ReadPipeInit); | |
881 | status = ReadDOC(docptr, LastDataRead); | |
882 | } else { | |
883 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
884 | DoC_Delay(this, 2); | |
885 | status = ReadDOC_(docptr, this->ioreg); | |
886 | } | |
887 | ||
888 | if (status & 1) { | |
889 | printk(KERN_ERR "Error programming flash\n"); | |
890 | /* Error in programming */ | |
891 | *retlen = 0; | |
48b19268 | 892 | mutex_unlock(&this->lock); |
1da177e4 LT |
893 | return -EIO; |
894 | } | |
895 | ||
896 | /* Let the caller know we completed it */ | |
897 | *retlen += len; | |
e5580fbe | 898 | |
1da177e4 LT |
899 | if (eccbuf) { |
900 | unsigned char x[8]; | |
901 | size_t dummy; | |
902 | int ret; | |
903 | ||
904 | /* Write the ECC data to flash */ | |
905 | for (di=0; di<6; di++) | |
906 | x[di] = eccbuf[di]; | |
e5580fbe | 907 | |
1da177e4 LT |
908 | x[6]=0x55; |
909 | x[7]=0x55; | |
e5580fbe | 910 | |
1da177e4 LT |
911 | ret = doc_write_oob_nolock(mtd, to, 8, &dummy, x); |
912 | if (ret) { | |
48b19268 | 913 | mutex_unlock(&this->lock); |
1da177e4 LT |
914 | return ret; |
915 | } | |
916 | } | |
917 | ||
918 | to += len; | |
919 | left -= len; | |
920 | buf += len; | |
921 | } | |
922 | ||
48b19268 | 923 | mutex_unlock(&this->lock); |
1da177e4 LT |
924 | return 0; |
925 | } | |
926 | ||
8593fbc6 TG |
927 | static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, |
928 | struct mtd_oob_ops *ops) | |
1da177e4 LT |
929 | { |
930 | struct DiskOnChip *this = mtd->priv; | |
931 | int len256 = 0, ret; | |
932 | struct Nand *mychip; | |
8593fbc6 TG |
933 | uint8_t *buf = ops->oobbuf; |
934 | size_t len = ops->len; | |
935 | ||
936 | BUG_ON(ops->mode != MTD_OOB_PLACE); | |
937 | ||
938 | ofs += ops->ooboffs; | |
1da177e4 | 939 | |
48b19268 | 940 | mutex_lock(&this->lock); |
1da177e4 LT |
941 | |
942 | mychip = &this->chips[ofs >> this->chipshift]; | |
943 | ||
944 | if (this->curfloor != mychip->floor) { | |
945 | DoC_SelectFloor(this, mychip->floor); | |
946 | DoC_SelectChip(this, mychip->chip); | |
947 | } else if (this->curchip != mychip->chip) { | |
948 | DoC_SelectChip(this, mychip->chip); | |
949 | } | |
950 | this->curfloor = mychip->floor; | |
951 | this->curchip = mychip->chip; | |
952 | ||
953 | /* update address for 2M x 8bit devices. OOB starts on the second */ | |
954 | /* page to maintain compatibility with doc_read_ecc. */ | |
955 | if (this->page256) { | |
956 | if (!(ofs & 0x8)) | |
957 | ofs += 0x100; | |
958 | else | |
959 | ofs -= 0x8; | |
960 | } | |
961 | ||
962 | DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); | |
963 | DoC_Address(this, ADDR_COLUMN_PAGE, ofs, CDSN_CTRL_WP, 0); | |
964 | ||
965 | /* treat crossing 8-byte OOB data for 2M x 8bit devices */ | |
966 | /* Note: datasheet says it should automaticaly wrap to the */ | |
967 | /* next OOB block, but it didn't work here. mf. */ | |
968 | if (this->page256 && ofs + len > (ofs | 0x7) + 1) { | |
969 | len256 = (ofs | 0x7) + 1 - ofs; | |
970 | DoC_ReadBuf(this, buf, len256); | |
971 | ||
972 | DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); | |
973 | DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), | |
974 | CDSN_CTRL_WP, 0); | |
975 | } | |
976 | ||
977 | DoC_ReadBuf(this, &buf[len256], len - len256); | |
978 | ||
8593fbc6 | 979 | ops->retlen = len; |
1da177e4 LT |
980 | /* Reading the full OOB data drops us off of the end of the page, |
981 | * causing the flash device to go into busy mode, so we need | |
982 | * to wait until ready 11.4.1 and Toshiba TC58256FT docs */ | |
e5580fbe | 983 | |
1da177e4 LT |
984 | ret = DoC_WaitReady(this); |
985 | ||
48b19268 | 986 | mutex_unlock(&this->lock); |
1da177e4 LT |
987 | return ret; |
988 | ||
989 | } | |
990 | ||
991 | static int doc_write_oob_nolock(struct mtd_info *mtd, loff_t ofs, size_t len, | |
992 | size_t * retlen, const u_char * buf) | |
993 | { | |
994 | struct DiskOnChip *this = mtd->priv; | |
995 | int len256 = 0; | |
996 | void __iomem *docptr = this->virtadr; | |
997 | struct Nand *mychip = &this->chips[ofs >> this->chipshift]; | |
998 | volatile int dummy; | |
999 | int status; | |
1000 | ||
1001 | // 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, | |
1002 | // buf[0], buf[1], buf[2], buf[3], buf[8], buf[9], buf[14],buf[15]); | |
1003 | ||
1004 | /* Find the chip which is to be used and select it */ | |
1005 | if (this->curfloor != mychip->floor) { | |
1006 | DoC_SelectFloor(this, mychip->floor); | |
1007 | DoC_SelectChip(this, mychip->chip); | |
1008 | } else if (this->curchip != mychip->chip) { | |
1009 | DoC_SelectChip(this, mychip->chip); | |
1010 | } | |
1011 | this->curfloor = mychip->floor; | |
1012 | this->curchip = mychip->chip; | |
1013 | ||
1014 | /* disable the ECC engine */ | |
1015 | WriteDOC (DOC_ECC_RESET, docptr, ECCConf); | |
1016 | WriteDOC (DOC_ECC_DIS, docptr, ECCConf); | |
1017 | ||
1018 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
1019 | DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP); | |
1020 | ||
1021 | /* issue the Read2 command to set the pointer to the Spare Data Area. */ | |
1022 | DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); | |
1023 | ||
1024 | /* update address for 2M x 8bit devices. OOB starts on the second */ | |
1025 | /* page to maintain compatibility with doc_read_ecc. */ | |
1026 | if (this->page256) { | |
1027 | if (!(ofs & 0x8)) | |
1028 | ofs += 0x100; | |
1029 | else | |
1030 | ofs -= 0x8; | |
1031 | } | |
1032 | ||
1033 | /* issue the Serial Data In command to initial the Page Program process */ | |
1034 | DoC_Command(this, NAND_CMD_SEQIN, 0); | |
1035 | DoC_Address(this, ADDR_COLUMN_PAGE, ofs, 0, 0); | |
1036 | ||
1037 | /* treat crossing 8-byte OOB data for 2M x 8bit devices */ | |
1038 | /* Note: datasheet says it should automaticaly wrap to the */ | |
1039 | /* next OOB block, but it didn't work here. mf. */ | |
1040 | if (this->page256 && ofs + len > (ofs | 0x7) + 1) { | |
1041 | len256 = (ofs | 0x7) + 1 - ofs; | |
1042 | DoC_WriteBuf(this, buf, len256); | |
1043 | ||
1044 | DoC_Command(this, NAND_CMD_PAGEPROG, 0); | |
1045 | DoC_Command(this, NAND_CMD_STATUS, 0); | |
1046 | /* DoC_WaitReady() is implicit in DoC_Command */ | |
1047 | ||
1048 | if (DoC_is_Millennium(this)) { | |
1049 | ReadDOC(docptr, ReadPipeInit); | |
1050 | status = ReadDOC(docptr, LastDataRead); | |
1051 | } else { | |
1052 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
1053 | DoC_Delay(this, 2); | |
1054 | status = ReadDOC_(docptr, this->ioreg); | |
1055 | } | |
1056 | ||
1057 | if (status & 1) { | |
1058 | printk(KERN_ERR "Error programming oob data\n"); | |
1059 | /* There was an error */ | |
1060 | *retlen = 0; | |
1061 | return -EIO; | |
1062 | } | |
1063 | DoC_Command(this, NAND_CMD_SEQIN, 0); | |
1064 | DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), 0, 0); | |
1065 | } | |
1066 | ||
1067 | DoC_WriteBuf(this, &buf[len256], len - len256); | |
1068 | ||
1069 | DoC_Command(this, NAND_CMD_PAGEPROG, 0); | |
1070 | DoC_Command(this, NAND_CMD_STATUS, 0); | |
1071 | /* DoC_WaitReady() is implicit in DoC_Command */ | |
1072 | ||
1073 | if (DoC_is_Millennium(this)) { | |
1074 | ReadDOC(docptr, ReadPipeInit); | |
1075 | status = ReadDOC(docptr, LastDataRead); | |
1076 | } else { | |
1077 | dummy = ReadDOC(docptr, CDSNSlowIO); | |
1078 | DoC_Delay(this, 2); | |
1079 | status = ReadDOC_(docptr, this->ioreg); | |
1080 | } | |
1081 | ||
1082 | if (status & 1) { | |
1083 | printk(KERN_ERR "Error programming oob data\n"); | |
1084 | /* There was an error */ | |
1085 | *retlen = 0; | |
1086 | return -EIO; | |
1087 | } | |
1088 | ||
1089 | *retlen = len; | |
1090 | return 0; | |
1091 | ||
1092 | } | |
e5580fbe | 1093 | |
8593fbc6 TG |
1094 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, |
1095 | struct mtd_oob_ops *ops) | |
1da177e4 | 1096 | { |
8593fbc6 TG |
1097 | struct DiskOnChip *this = mtd->priv; |
1098 | int ret; | |
1da177e4 | 1099 | |
8593fbc6 | 1100 | BUG_ON(ops->mode != MTD_OOB_PLACE); |
1da177e4 | 1101 | |
8593fbc6 TG |
1102 | mutex_lock(&this->lock); |
1103 | ret = doc_write_oob_nolock(mtd, ofs + ops->ooboffs, ops->len, | |
1104 | &ops->retlen, ops->oobbuf); | |
1105 | ||
1106 | mutex_unlock(&this->lock); | |
1107 | return ret; | |
1da177e4 LT |
1108 | } |
1109 | ||
1110 | static int doc_erase(struct mtd_info *mtd, struct erase_info *instr) | |
1111 | { | |
1112 | struct DiskOnChip *this = mtd->priv; | |
1113 | __u32 ofs = instr->addr; | |
1114 | __u32 len = instr->len; | |
1115 | volatile int dummy; | |
1116 | void __iomem *docptr = this->virtadr; | |
1117 | struct Nand *mychip; | |
1118 | int status; | |
1119 | ||
48b19268 | 1120 | mutex_lock(&this->lock); |
1da177e4 LT |
1121 | |
1122 | if (ofs & (mtd->erasesize-1) || len & (mtd->erasesize-1)) { | |
48b19268 | 1123 | mutex_unlock(&this->lock); |
1da177e4 LT |
1124 | return -EINVAL; |
1125 | } | |
1126 | ||
1127 | instr->state = MTD_ERASING; | |
e5580fbe | 1128 | |
1da177e4 LT |
1129 | /* FIXME: Do this in the background. Use timers or schedule_task() */ |
1130 | while(len) { | |
1131 | mychip = &this->chips[ofs >> this->chipshift]; | |
1132 | ||
1133 | if (this->curfloor != mychip->floor) { | |
1134 | DoC_SelectFloor(this, mychip->floor); | |
1135 | DoC_SelectChip(this, mychip->chip); | |
1136 | } else if (this->curchip != mychip->chip) { | |
1137 | DoC_SelectChip(this, mychip->chip); | |
1138 | } | |
1139 | this->curfloor = mychip->floor; | |
1140 | this->curchip = mychip->chip; | |
1141 | ||
1142 | DoC_Command(this, NAND_CMD_ERASE1, 0); | |
1143 | DoC_Address(this, ADDR_PAGE, ofs, 0, 0); | |
1144 | DoC_Command(this, NAND_CMD_ERASE2, 0); | |
1145 | ||
1146 | DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); | |
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 erasing at 0x%x\n", ofs); | |
1159 | /* There was an error */ | |
1160 | instr->state = MTD_ERASE_FAILED; | |
1161 | goto callback; | |
1162 | } | |
1163 | ofs += mtd->erasesize; | |
1164 | len -= mtd->erasesize; | |
1165 | } | |
1166 | instr->state = MTD_ERASE_DONE; | |
1167 | ||
1168 | callback: | |
1169 | mtd_erase_callback(instr); | |
1170 | ||
48b19268 | 1171 | mutex_unlock(&this->lock); |
1da177e4 LT |
1172 | return 0; |
1173 | } | |
1174 | ||
1175 | ||
1176 | /**************************************************************************** | |
1177 | * | |
1178 | * Module stuff | |
1179 | * | |
1180 | ****************************************************************************/ | |
1181 | ||
1da177e4 LT |
1182 | static void __exit cleanup_doc2000(void) |
1183 | { | |
1184 | struct mtd_info *mtd; | |
1185 | struct DiskOnChip *this; | |
1186 | ||
1187 | while ((mtd = doc2klist)) { | |
1188 | this = mtd->priv; | |
1189 | doc2klist = this->nextdoc; | |
1190 | ||
1191 | del_mtd_device(mtd); | |
1192 | ||
1193 | iounmap(this->virtadr); | |
1194 | kfree(this->chips); | |
1195 | kfree(mtd); | |
1196 | } | |
1da177e4 LT |
1197 | } |
1198 | ||
1199 | module_exit(cleanup_doc2000); | |
1da177e4 LT |
1200 | |
1201 | MODULE_LICENSE("GPL"); | |
1202 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al."); | |
1203 | MODULE_DESCRIPTION("MTD driver for DiskOnChip 2000 and Millennium"); | |
1204 |