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1da177e4 LT |
1 | |
2 | /* | |
3 | * Linux driver for Disk-On-Chip Millennium | |
4 | * (c) 1999 Machine Vision Holdings, Inc. | |
5 | * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org> | |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/module.h> | |
10 | #include <asm/errno.h> | |
11 | #include <asm/io.h> | |
12 | #include <asm/uaccess.h> | |
1da177e4 LT |
13 | #include <linux/delay.h> |
14 | #include <linux/slab.h> | |
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/types.h> | |
17 | #include <linux/bitops.h> | |
18 | ||
19 | #include <linux/mtd/mtd.h> | |
20 | #include <linux/mtd/nand.h> | |
21 | #include <linux/mtd/doc2000.h> | |
22 | ||
23 | /* #define ECC_DEBUG */ | |
24 | ||
25 | /* I have no idea why some DoC chips can not use memcop_form|to_io(). | |
26 | * This may be due to the different revisions of the ASIC controller built-in or | |
27 | * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment | |
28 | * this:*/ | |
29 | #undef USE_MEMCPY | |
30 | ||
31 | static int doc_read(struct mtd_info *mtd, loff_t from, size_t len, | |
32 | size_t *retlen, u_char *buf); | |
33 | static int doc_write(struct mtd_info *mtd, loff_t to, size_t len, | |
34 | size_t *retlen, const u_char *buf); | |
8593fbc6 TG |
35 | static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, |
36 | struct mtd_oob_ops *ops); | |
37 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, | |
38 | struct mtd_oob_ops *ops); | |
1da177e4 LT |
39 | static int doc_erase (struct mtd_info *mtd, struct erase_info *instr); |
40 | ||
41 | static struct mtd_info *docmillist = NULL; | |
42 | ||
43 | /* Perform the required delay cycles by reading from the NOP register */ | |
44 | static void DoC_Delay(void __iomem * docptr, unsigned short cycles) | |
45 | { | |
46 | volatile char dummy; | |
47 | int i; | |
48 | ||
49 | for (i = 0; i < cycles; i++) | |
50 | dummy = ReadDOC(docptr, NOP); | |
51 | } | |
52 | ||
53 | /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */ | |
54 | static int _DoC_WaitReady(void __iomem * docptr) | |
55 | { | |
56 | unsigned short c = 0xffff; | |
57 | ||
289c0522 | 58 | pr_debug("_DoC_WaitReady called for out-of-line wait\n"); |
1da177e4 LT |
59 | |
60 | /* Out-of-line routine to wait for chip response */ | |
61 | while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B) && --c) | |
62 | ; | |
63 | ||
64 | if (c == 0) | |
289c0522 | 65 | pr_debug("_DoC_WaitReady timed out.\n"); |
1da177e4 LT |
66 | |
67 | return (c == 0); | |
68 | } | |
69 | ||
70 | static inline int DoC_WaitReady(void __iomem * docptr) | |
71 | { | |
72 | /* This is inline, to optimise the common case, where it's ready instantly */ | |
73 | int ret = 0; | |
74 | ||
75 | /* 4 read form NOP register should be issued in prior to the read from CDSNControl | |
76 | see Software Requirement 11.4 item 2. */ | |
77 | DoC_Delay(docptr, 4); | |
78 | ||
79 | if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) | |
80 | /* Call the out-of-line routine to wait */ | |
81 | ret = _DoC_WaitReady(docptr); | |
82 | ||
83 | /* issue 2 read from NOP register after reading from CDSNControl register | |
84 | see Software Requirement 11.4 item 2. */ | |
85 | DoC_Delay(docptr, 2); | |
86 | ||
87 | return ret; | |
88 | } | |
89 | ||
90 | /* DoC_Command: Send a flash command to the flash chip through the CDSN IO register | |
91 | with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is | |
92 | required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */ | |
93 | ||
858119e1 | 94 | static void DoC_Command(void __iomem * docptr, unsigned char command, |
1da177e4 LT |
95 | unsigned char xtraflags) |
96 | { | |
97 | /* Assert the CLE (Command Latch Enable) line to the flash chip */ | |
98 | WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl); | |
99 | DoC_Delay(docptr, 4); | |
100 | ||
101 | /* Send the command */ | |
102 | WriteDOC(command, docptr, Mil_CDSN_IO); | |
103 | WriteDOC(0x00, docptr, WritePipeTerm); | |
104 | ||
105 | /* Lower the CLE line */ | |
106 | WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl); | |
107 | DoC_Delay(docptr, 4); | |
108 | } | |
109 | ||
110 | /* DoC_Address: Set the current address for the flash chip through the CDSN IO register | |
111 | with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is | |
112 | required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */ | |
113 | ||
114 | static inline void DoC_Address(void __iomem * docptr, int numbytes, unsigned long ofs, | |
115 | unsigned char xtraflags1, unsigned char xtraflags2) | |
116 | { | |
117 | /* Assert the ALE (Address Latch Enable) line to the flash chip */ | |
118 | WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl); | |
119 | DoC_Delay(docptr, 4); | |
120 | ||
121 | /* Send the address */ | |
122 | switch (numbytes) | |
123 | { | |
124 | case 1: | |
125 | /* Send single byte, bits 0-7. */ | |
126 | WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO); | |
127 | WriteDOC(0x00, docptr, WritePipeTerm); | |
128 | break; | |
129 | case 2: | |
130 | /* Send bits 9-16 followed by 17-23 */ | |
131 | WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO); | |
132 | WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO); | |
133 | WriteDOC(0x00, docptr, WritePipeTerm); | |
134 | break; | |
135 | case 3: | |
136 | /* Send 0-7, 9-16, then 17-23 */ | |
137 | WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO); | |
138 | WriteDOC((ofs >> 9) & 0xff, docptr, Mil_CDSN_IO); | |
139 | WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO); | |
140 | WriteDOC(0x00, docptr, WritePipeTerm); | |
141 | break; | |
142 | default: | |
143 | return; | |
144 | } | |
145 | ||
146 | /* Lower the ALE line */ | |
147 | WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, CDSNControl); | |
148 | DoC_Delay(docptr, 4); | |
149 | } | |
150 | ||
151 | /* DoC_SelectChip: Select a given flash chip within the current floor */ | |
152 | static int DoC_SelectChip(void __iomem * docptr, int chip) | |
153 | { | |
154 | /* Select the individual flash chip requested */ | |
155 | WriteDOC(chip, docptr, CDSNDeviceSelect); | |
156 | DoC_Delay(docptr, 4); | |
157 | ||
158 | /* Wait for it to be ready */ | |
159 | return DoC_WaitReady(docptr); | |
160 | } | |
161 | ||
162 | /* DoC_SelectFloor: Select a given floor (bank of flash chips) */ | |
163 | static int DoC_SelectFloor(void __iomem * docptr, int floor) | |
164 | { | |
165 | /* Select the floor (bank) of chips required */ | |
166 | WriteDOC(floor, docptr, FloorSelect); | |
167 | ||
168 | /* Wait for the chip to be ready */ | |
169 | return DoC_WaitReady(docptr); | |
170 | } | |
171 | ||
172 | /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */ | |
173 | static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip) | |
174 | { | |
175 | int mfr, id, i, j; | |
176 | volatile char dummy; | |
177 | ||
178 | /* Page in the required floor/chip | |
179 | FIXME: is this supported by Millennium ?? */ | |
180 | DoC_SelectFloor(doc->virtadr, floor); | |
181 | DoC_SelectChip(doc->virtadr, chip); | |
182 | ||
183 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
184 | DoC_Command(doc->virtadr, NAND_CMD_RESET, CDSN_CTRL_WP); | |
185 | DoC_WaitReady(doc->virtadr); | |
186 | ||
e5580fbe | 187 | /* Read the NAND chip ID: 1. Send ReadID command */ |
1da177e4 LT |
188 | DoC_Command(doc->virtadr, NAND_CMD_READID, CDSN_CTRL_WP); |
189 | ||
e5580fbe | 190 | /* Read the NAND chip ID: 2. Send address byte zero */ |
1da177e4 LT |
191 | DoC_Address(doc->virtadr, 1, 0x00, CDSN_CTRL_WP, 0x00); |
192 | ||
193 | /* Read the manufacturer and device id codes of the flash device through | |
194 | CDSN IO register see Software Requirement 11.4 item 5.*/ | |
195 | dummy = ReadDOC(doc->virtadr, ReadPipeInit); | |
196 | DoC_Delay(doc->virtadr, 2); | |
197 | mfr = ReadDOC(doc->virtadr, Mil_CDSN_IO); | |
198 | ||
199 | DoC_Delay(doc->virtadr, 2); | |
200 | id = ReadDOC(doc->virtadr, Mil_CDSN_IO); | |
201 | dummy = ReadDOC(doc->virtadr, LastDataRead); | |
202 | ||
203 | /* No response - return failure */ | |
204 | if (mfr == 0xff || mfr == 0) | |
205 | return 0; | |
206 | ||
207 | /* FIXME: to deal with multi-flash on multi-Millennium case more carefully */ | |
208 | for (i = 0; nand_flash_ids[i].name != NULL; i++) { | |
209 | if ( id == nand_flash_ids[i].id) { | |
210 | /* Try to identify manufacturer */ | |
211 | for (j = 0; nand_manuf_ids[j].id != 0x0; j++) { | |
212 | if (nand_manuf_ids[j].id == mfr) | |
213 | break; | |
e5580fbe | 214 | } |
1da177e4 LT |
215 | printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, " |
216 | "Chip ID: %2.2X (%s:%s)\n", | |
217 | mfr, id, nand_manuf_ids[j].name, nand_flash_ids[i].name); | |
218 | doc->mfr = mfr; | |
219 | doc->id = id; | |
220 | doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1; | |
221 | break; | |
222 | } | |
223 | } | |
224 | ||
225 | if (nand_flash_ids[i].name == NULL) | |
226 | return 0; | |
227 | else | |
228 | return 1; | |
229 | } | |
230 | ||
231 | /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */ | |
232 | static void DoC_ScanChips(struct DiskOnChip *this) | |
233 | { | |
234 | int floor, chip; | |
235 | int numchips[MAX_FLOORS_MIL]; | |
236 | int ret; | |
237 | ||
238 | this->numchips = 0; | |
239 | this->mfr = 0; | |
240 | this->id = 0; | |
241 | ||
242 | /* For each floor, find the number of valid chips it contains */ | |
243 | for (floor = 0,ret = 1; floor < MAX_FLOORS_MIL; floor++) { | |
244 | numchips[floor] = 0; | |
245 | for (chip = 0; chip < MAX_CHIPS_MIL && ret != 0; chip++) { | |
246 | ret = DoC_IdentChip(this, floor, chip); | |
247 | if (ret) { | |
248 | numchips[floor]++; | |
249 | this->numchips++; | |
250 | } | |
251 | } | |
252 | } | |
253 | /* If there are none at all that we recognise, bail */ | |
254 | if (!this->numchips) { | |
255 | printk("No flash chips recognised.\n"); | |
256 | return; | |
257 | } | |
258 | ||
259 | /* Allocate an array to hold the information for each chip */ | |
260 | this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL); | |
261 | if (!this->chips){ | |
262 | printk("No memory for allocating chip info structures\n"); | |
263 | return; | |
264 | } | |
265 | ||
e5580fbe | 266 | /* Fill out the chip array with {floor, chipno} for each |
1da177e4 LT |
267 | * detected chip in the device. */ |
268 | for (floor = 0, ret = 0; floor < MAX_FLOORS_MIL; floor++) { | |
269 | for (chip = 0 ; chip < numchips[floor] ; chip++) { | |
270 | this->chips[ret].floor = floor; | |
271 | this->chips[ret].chip = chip; | |
272 | this->chips[ret].curadr = 0; | |
273 | this->chips[ret].curmode = 0x50; | |
274 | ret++; | |
275 | } | |
276 | } | |
277 | ||
278 | /* Calculate and print the total size of the device */ | |
279 | this->totlen = this->numchips * (1 << this->chipshift); | |
280 | printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n", | |
281 | this->numchips ,this->totlen >> 20); | |
282 | } | |
283 | ||
284 | static int DoCMil_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2) | |
285 | { | |
286 | int tmp1, tmp2, retval; | |
287 | ||
288 | if (doc1->physadr == doc2->physadr) | |
289 | return 1; | |
290 | ||
291 | /* Use the alias resolution register which was set aside for this | |
292 | * purpose. If it's value is the same on both chips, they might | |
293 | * be the same chip, and we write to one and check for a change in | |
294 | * the other. It's unclear if this register is usuable in the | |
295 | * DoC 2000 (it's in the Millenium docs), but it seems to work. */ | |
296 | tmp1 = ReadDOC(doc1->virtadr, AliasResolution); | |
297 | tmp2 = ReadDOC(doc2->virtadr, AliasResolution); | |
298 | if (tmp1 != tmp2) | |
299 | return 0; | |
e5580fbe | 300 | |
1da177e4 LT |
301 | WriteDOC((tmp1+1) % 0xff, doc1->virtadr, AliasResolution); |
302 | tmp2 = ReadDOC(doc2->virtadr, AliasResolution); | |
303 | if (tmp2 == (tmp1+1) % 0xff) | |
304 | retval = 1; | |
305 | else | |
306 | retval = 0; | |
307 | ||
308 | /* Restore register contents. May not be necessary, but do it just to | |
309 | * be safe. */ | |
310 | WriteDOC(tmp1, doc1->virtadr, AliasResolution); | |
311 | ||
312 | return retval; | |
313 | } | |
314 | ||
5e535429 DW |
315 | /* This routine is found from the docprobe code by symbol_get(), |
316 | * which will bump the use count of this module. */ | |
317 | void DoCMil_init(struct mtd_info *mtd) | |
1da177e4 LT |
318 | { |
319 | struct DiskOnChip *this = mtd->priv; | |
320 | struct DiskOnChip *old = NULL; | |
321 | ||
322 | /* We must avoid being called twice for the same device. */ | |
323 | if (docmillist) | |
324 | old = docmillist->priv; | |
325 | ||
326 | while (old) { | |
327 | if (DoCMil_is_alias(this, old)) { | |
328 | printk(KERN_NOTICE "Ignoring DiskOnChip Millennium at " | |
329 | "0x%lX - already configured\n", this->physadr); | |
330 | iounmap(this->virtadr); | |
331 | kfree(mtd); | |
332 | return; | |
333 | } | |
334 | if (old->nextdoc) | |
335 | old = old->nextdoc->priv; | |
336 | else | |
337 | old = NULL; | |
338 | } | |
339 | ||
340 | mtd->name = "DiskOnChip Millennium"; | |
341 | printk(KERN_NOTICE "DiskOnChip Millennium found at address 0x%lX\n", | |
342 | this->physadr); | |
343 | ||
344 | mtd->type = MTD_NANDFLASH; | |
345 | mtd->flags = MTD_CAP_NANDFLASH; | |
1da177e4 LT |
346 | mtd->size = 0; |
347 | ||
348 | /* FIXME: erase size is not always 8KiB */ | |
349 | mtd->erasesize = 0x2000; | |
350 | ||
28318776 | 351 | mtd->writesize = 512; |
1da177e4 LT |
352 | mtd->oobsize = 16; |
353 | mtd->owner = THIS_MODULE; | |
354 | mtd->erase = doc_erase; | |
355 | mtd->point = NULL; | |
356 | mtd->unpoint = NULL; | |
357 | mtd->read = doc_read; | |
358 | mtd->write = doc_write; | |
1da177e4 LT |
359 | mtd->read_oob = doc_read_oob; |
360 | mtd->write_oob = doc_write_oob; | |
361 | mtd->sync = NULL; | |
362 | ||
363 | this->totlen = 0; | |
364 | this->numchips = 0; | |
365 | this->curfloor = -1; | |
366 | this->curchip = -1; | |
367 | ||
368 | /* Ident all the chips present. */ | |
369 | DoC_ScanChips(this); | |
370 | ||
371 | if (!this->totlen) { | |
372 | kfree(mtd); | |
373 | iounmap(this->virtadr); | |
374 | } else { | |
375 | this->nextdoc = docmillist; | |
376 | docmillist = mtd; | |
377 | mtd->size = this->totlen; | |
ee0e87b1 | 378 | mtd_device_register(mtd, NULL, 0); |
1da177e4 LT |
379 | return; |
380 | } | |
381 | } | |
f0ad11d0 | 382 | EXPORT_SYMBOL_GPL(DoCMil_init); |
1da177e4 LT |
383 | |
384 | static int doc_read (struct mtd_info *mtd, loff_t from, size_t len, | |
385 | size_t *retlen, u_char *buf) | |
1da177e4 LT |
386 | { |
387 | int i, ret; | |
388 | volatile char dummy; | |
7f8a8940 | 389 | unsigned char syndrome[6], eccbuf[6]; |
1da177e4 LT |
390 | struct DiskOnChip *this = mtd->priv; |
391 | void __iomem *docptr = this->virtadr; | |
392 | struct Nand *mychip = &this->chips[from >> (this->chipshift)]; | |
393 | ||
394 | /* Don't allow read past end of device */ | |
395 | if (from >= this->totlen) | |
396 | return -EINVAL; | |
397 | ||
398 | /* Don't allow a single read to cross a 512-byte block boundary */ | |
e5580fbe | 399 | if (from + len > ((from | 0x1ff) + 1)) |
1da177e4 LT |
400 | len = ((from | 0x1ff) + 1) - from; |
401 | ||
402 | /* Find the chip which is to be used and select it */ | |
403 | if (this->curfloor != mychip->floor) { | |
404 | DoC_SelectFloor(docptr, mychip->floor); | |
405 | DoC_SelectChip(docptr, mychip->chip); | |
406 | } else if (this->curchip != mychip->chip) { | |
407 | DoC_SelectChip(docptr, mychip->chip); | |
408 | } | |
409 | this->curfloor = mychip->floor; | |
410 | this->curchip = mychip->chip; | |
411 | ||
412 | /* issue the Read0 or Read1 command depend on which half of the page | |
413 | we are accessing. Polling the Flash Ready bit after issue 3 bytes | |
414 | address in Sequence Read Mode, see Software Requirement 11.4 item 1.*/ | |
415 | DoC_Command(docptr, (from >> 8) & 1, CDSN_CTRL_WP); | |
416 | DoC_Address(docptr, 3, from, CDSN_CTRL_WP, 0x00); | |
417 | DoC_WaitReady(docptr); | |
418 | ||
7f8a8940 TG |
419 | /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/ |
420 | WriteDOC (DOC_ECC_RESET, docptr, ECCConf); | |
421 | WriteDOC (DOC_ECC_EN, docptr, ECCConf); | |
1da177e4 LT |
422 | |
423 | /* Read the data via the internal pipeline through CDSN IO register, | |
424 | see Pipelined Read Operations 11.3 */ | |
425 | dummy = ReadDOC(docptr, ReadPipeInit); | |
426 | #ifndef USE_MEMCPY | |
427 | for (i = 0; i < len-1; i++) { | |
428 | /* N.B. you have to increase the source address in this way or the | |
429 | ECC logic will not work properly */ | |
430 | buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff)); | |
431 | } | |
432 | #else | |
433 | memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1); | |
434 | #endif | |
435 | buf[len - 1] = ReadDOC(docptr, LastDataRead); | |
436 | ||
437 | /* Let the caller know we completed it */ | |
438 | *retlen = len; | |
439 | ret = 0; | |
440 | ||
7f8a8940 TG |
441 | /* Read the ECC data from Spare Data Area, |
442 | see Reed-Solomon EDC/ECC 11.1 */ | |
443 | dummy = ReadDOC(docptr, ReadPipeInit); | |
1da177e4 | 444 | #ifndef USE_MEMCPY |
7f8a8940 TG |
445 | for (i = 0; i < 5; i++) { |
446 | /* N.B. you have to increase the source address in this way or the | |
447 | ECC logic will not work properly */ | |
448 | eccbuf[i] = ReadDOC(docptr, Mil_CDSN_IO + i); | |
449 | } | |
1da177e4 | 450 | #else |
7f8a8940 | 451 | memcpy_fromio(eccbuf, docptr + DoC_Mil_CDSN_IO, 5); |
1da177e4 | 452 | #endif |
7f8a8940 | 453 | eccbuf[5] = ReadDOC(docptr, LastDataRead); |
1da177e4 | 454 | |
7f8a8940 TG |
455 | /* Flush the pipeline */ |
456 | dummy = ReadDOC(docptr, ECCConf); | |
457 | dummy = ReadDOC(docptr, ECCConf); | |
1da177e4 | 458 | |
7f8a8940 TG |
459 | /* Check the ECC Status */ |
460 | if (ReadDOC(docptr, ECCConf) & 0x80) { | |
461 | int nb_errors; | |
462 | /* There was an ECC error */ | |
1da177e4 | 463 | #ifdef ECC_DEBUG |
7f8a8940 | 464 | printk("DiskOnChip ECC Error: Read at %lx\n", (long)from); |
1da177e4 | 465 | #endif |
7854d3f7 | 466 | /* Read the ECC syndrome through the DiskOnChip ECC logic. |
7f8a8940 TG |
467 | These syndrome will be all ZERO when there is no error */ |
468 | for (i = 0; i < 6; i++) { | |
469 | syndrome[i] = ReadDOC(docptr, ECCSyndrome0 + i); | |
470 | } | |
471 | nb_errors = doc_decode_ecc(buf, syndrome); | |
1da177e4 | 472 | #ifdef ECC_DEBUG |
7f8a8940 | 473 | printk("ECC Errors corrected: %x\n", nb_errors); |
1da177e4 | 474 | #endif |
7f8a8940 TG |
475 | if (nb_errors < 0) { |
476 | /* We return error, but have actually done the read. Not that | |
477 | this can be told to user-space, via sys_read(), but at least | |
478 | MTD-aware stuff can know about it by checking *retlen */ | |
479 | ret = -EIO; | |
1da177e4 | 480 | } |
7f8a8940 | 481 | } |
1da177e4 LT |
482 | |
483 | #ifdef PSYCHO_DEBUG | |
7f8a8940 TG |
484 | printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", |
485 | (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3], | |
486 | eccbuf[4], eccbuf[5]); | |
1da177e4 LT |
487 | #endif |
488 | ||
7f8a8940 TG |
489 | /* disable the ECC engine */ |
490 | WriteDOC(DOC_ECC_DIS, docptr , ECCConf); | |
1da177e4 LT |
491 | |
492 | return ret; | |
493 | } | |
494 | ||
495 | static int doc_write (struct mtd_info *mtd, loff_t to, size_t len, | |
496 | size_t *retlen, const u_char *buf) | |
1da177e4 LT |
497 | { |
498 | int i,ret = 0; | |
7f8a8940 | 499 | char eccbuf[6]; |
1da177e4 LT |
500 | volatile char dummy; |
501 | struct DiskOnChip *this = mtd->priv; | |
502 | void __iomem *docptr = this->virtadr; | |
503 | struct Nand *mychip = &this->chips[to >> (this->chipshift)]; | |
504 | ||
505 | /* Don't allow write past end of device */ | |
506 | if (to >= this->totlen) | |
507 | return -EINVAL; | |
508 | ||
509 | #if 0 | |
510 | /* Don't allow a single write to cross a 512-byte block boundary */ | |
e5580fbe | 511 | if (to + len > ( (to | 0x1ff) + 1)) |
1da177e4 LT |
512 | len = ((to | 0x1ff) + 1) - to; |
513 | #else | |
514 | /* Don't allow writes which aren't exactly one block */ | |
515 | if (to & 0x1ff || len != 0x200) | |
516 | return -EINVAL; | |
517 | #endif | |
518 | ||
519 | /* Find the chip which is to be used and select it */ | |
520 | if (this->curfloor != mychip->floor) { | |
521 | DoC_SelectFloor(docptr, mychip->floor); | |
522 | DoC_SelectChip(docptr, mychip->chip); | |
523 | } else if (this->curchip != mychip->chip) { | |
524 | DoC_SelectChip(docptr, mychip->chip); | |
525 | } | |
526 | this->curfloor = mychip->floor; | |
527 | this->curchip = mychip->chip; | |
528 | ||
529 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
530 | DoC_Command(docptr, NAND_CMD_RESET, 0x00); | |
531 | DoC_WaitReady(docptr); | |
532 | /* Set device to main plane of flash */ | |
533 | DoC_Command(docptr, NAND_CMD_READ0, 0x00); | |
534 | ||
535 | /* issue the Serial Data In command to initial the Page Program process */ | |
536 | DoC_Command(docptr, NAND_CMD_SEQIN, 0x00); | |
537 | DoC_Address(docptr, 3, to, 0x00, 0x00); | |
538 | DoC_WaitReady(docptr); | |
539 | ||
7f8a8940 TG |
540 | /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/ |
541 | WriteDOC (DOC_ECC_RESET, docptr, ECCConf); | |
542 | WriteDOC (DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf); | |
1da177e4 LT |
543 | |
544 | /* Write the data via the internal pipeline through CDSN IO register, | |
545 | see Pipelined Write Operations 11.2 */ | |
546 | #ifndef USE_MEMCPY | |
547 | for (i = 0; i < len; i++) { | |
548 | /* N.B. you have to increase the source address in this way or the | |
549 | ECC logic will not work properly */ | |
550 | WriteDOC(buf[i], docptr, Mil_CDSN_IO + i); | |
551 | } | |
552 | #else | |
553 | memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len); | |
554 | #endif | |
555 | WriteDOC(0x00, docptr, WritePipeTerm); | |
556 | ||
7f8a8940 TG |
557 | /* Write ECC data to flash, the ECC info is generated by the DiskOnChip ECC logic |
558 | see Reed-Solomon EDC/ECC 11.1 */ | |
559 | WriteDOC(0, docptr, NOP); | |
560 | WriteDOC(0, docptr, NOP); | |
561 | WriteDOC(0, docptr, NOP); | |
1da177e4 | 562 | |
7f8a8940 TG |
563 | /* Read the ECC data through the DiskOnChip ECC logic */ |
564 | for (i = 0; i < 6; i++) { | |
565 | eccbuf[i] = ReadDOC(docptr, ECCSyndrome0 + i); | |
566 | } | |
1da177e4 | 567 | |
7f8a8940 TG |
568 | /* ignore the ECC engine */ |
569 | WriteDOC(DOC_ECC_DIS, docptr , ECCConf); | |
1da177e4 LT |
570 | |
571 | #ifndef USE_MEMCPY | |
7f8a8940 TG |
572 | /* Write the ECC data to flash */ |
573 | for (i = 0; i < 6; i++) { | |
574 | /* N.B. you have to increase the source address in this way or the | |
575 | ECC logic will not work properly */ | |
576 | WriteDOC(eccbuf[i], docptr, Mil_CDSN_IO + i); | |
577 | } | |
1da177e4 | 578 | #else |
7f8a8940 | 579 | memcpy_toio(docptr + DoC_Mil_CDSN_IO, eccbuf, 6); |
1da177e4 LT |
580 | #endif |
581 | ||
7f8a8940 TG |
582 | /* write the block status BLOCK_USED (0x5555) at the end of ECC data |
583 | FIXME: this is only a hack for programming the IPL area for LinuxBIOS | |
584 | and should be replace with proper codes in user space utilities */ | |
585 | WriteDOC(0x55, docptr, Mil_CDSN_IO); | |
586 | WriteDOC(0x55, docptr, Mil_CDSN_IO + 1); | |
1da177e4 | 587 | |
7f8a8940 | 588 | WriteDOC(0x00, docptr, WritePipeTerm); |
1da177e4 LT |
589 | |
590 | #ifdef PSYCHO_DEBUG | |
7f8a8940 TG |
591 | printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", |
592 | (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3], | |
593 | eccbuf[4], eccbuf[5]); | |
1da177e4 | 594 | #endif |
1da177e4 LT |
595 | |
596 | /* Commit the Page Program command and wait for ready | |
597 | see Software Requirement 11.4 item 1.*/ | |
598 | DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00); | |
599 | DoC_WaitReady(docptr); | |
600 | ||
601 | /* Read the status of the flash device through CDSN IO register | |
602 | see Software Requirement 11.4 item 5.*/ | |
603 | DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP); | |
604 | dummy = ReadDOC(docptr, ReadPipeInit); | |
605 | DoC_Delay(docptr, 2); | |
606 | if (ReadDOC(docptr, Mil_CDSN_IO) & 1) { | |
607 | printk("Error programming flash\n"); | |
608 | /* Error in programming | |
609 | FIXME: implement Bad Block Replacement (in nftl.c ??) */ | |
610 | *retlen = 0; | |
611 | ret = -EIO; | |
612 | } | |
613 | dummy = ReadDOC(docptr, LastDataRead); | |
614 | ||
615 | /* Let the caller know we completed it */ | |
616 | *retlen = len; | |
617 | ||
618 | return ret; | |
619 | } | |
620 | ||
8593fbc6 TG |
621 | static int doc_read_oob(struct mtd_info *mtd, loff_t ofs, |
622 | struct mtd_oob_ops *ops) | |
1da177e4 LT |
623 | { |
624 | #ifndef USE_MEMCPY | |
625 | int i; | |
626 | #endif | |
627 | volatile char dummy; | |
628 | struct DiskOnChip *this = mtd->priv; | |
629 | void __iomem *docptr = this->virtadr; | |
630 | struct Nand *mychip = &this->chips[ofs >> this->chipshift]; | |
8593fbc6 TG |
631 | uint8_t *buf = ops->oobbuf; |
632 | size_t len = ops->len; | |
633 | ||
634 | BUG_ON(ops->mode != MTD_OOB_PLACE); | |
635 | ||
636 | ofs += ops->ooboffs; | |
1da177e4 LT |
637 | |
638 | /* Find the chip which is to be used and select it */ | |
639 | if (this->curfloor != mychip->floor) { | |
640 | DoC_SelectFloor(docptr, mychip->floor); | |
641 | DoC_SelectChip(docptr, mychip->chip); | |
642 | } else if (this->curchip != mychip->chip) { | |
643 | DoC_SelectChip(docptr, mychip->chip); | |
644 | } | |
645 | this->curfloor = mychip->floor; | |
646 | this->curchip = mychip->chip; | |
647 | ||
648 | /* disable the ECC engine */ | |
649 | WriteDOC (DOC_ECC_RESET, docptr, ECCConf); | |
650 | WriteDOC (DOC_ECC_DIS, docptr, ECCConf); | |
651 | ||
652 | /* issue the Read2 command to set the pointer to the Spare Data Area. | |
653 | Polling the Flash Ready bit after issue 3 bytes address in | |
654 | Sequence Read Mode, see Software Requirement 11.4 item 1.*/ | |
655 | DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP); | |
656 | DoC_Address(docptr, 3, ofs, CDSN_CTRL_WP, 0x00); | |
657 | DoC_WaitReady(docptr); | |
658 | ||
659 | /* Read the data out via the internal pipeline through CDSN IO register, | |
660 | see Pipelined Read Operations 11.3 */ | |
661 | dummy = ReadDOC(docptr, ReadPipeInit); | |
662 | #ifndef USE_MEMCPY | |
663 | for (i = 0; i < len-1; i++) { | |
664 | /* N.B. you have to increase the source address in this way or the | |
665 | ECC logic will not work properly */ | |
666 | buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i); | |
667 | } | |
668 | #else | |
669 | memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1); | |
670 | #endif | |
671 | buf[len - 1] = ReadDOC(docptr, LastDataRead); | |
672 | ||
8593fbc6 | 673 | ops->retlen = len; |
1da177e4 LT |
674 | |
675 | return 0; | |
676 | } | |
677 | ||
8593fbc6 TG |
678 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, |
679 | struct mtd_oob_ops *ops) | |
1da177e4 LT |
680 | { |
681 | #ifndef USE_MEMCPY | |
682 | int i; | |
683 | #endif | |
684 | volatile char dummy; | |
685 | int ret = 0; | |
686 | struct DiskOnChip *this = mtd->priv; | |
687 | void __iomem *docptr = this->virtadr; | |
688 | struct Nand *mychip = &this->chips[ofs >> this->chipshift]; | |
8593fbc6 TG |
689 | uint8_t *buf = ops->oobbuf; |
690 | size_t len = ops->len; | |
691 | ||
692 | BUG_ON(ops->mode != MTD_OOB_PLACE); | |
693 | ||
694 | ofs += ops->ooboffs; | |
1da177e4 LT |
695 | |
696 | /* Find the chip which is to be used and select it */ | |
697 | if (this->curfloor != mychip->floor) { | |
698 | DoC_SelectFloor(docptr, mychip->floor); | |
699 | DoC_SelectChip(docptr, mychip->chip); | |
700 | } else if (this->curchip != mychip->chip) { | |
701 | DoC_SelectChip(docptr, mychip->chip); | |
702 | } | |
703 | this->curfloor = mychip->floor; | |
704 | this->curchip = mychip->chip; | |
705 | ||
706 | /* disable the ECC engine */ | |
707 | WriteDOC (DOC_ECC_RESET, docptr, ECCConf); | |
708 | WriteDOC (DOC_ECC_DIS, docptr, ECCConf); | |
709 | ||
710 | /* Reset the chip, see Software Requirement 11.4 item 1. */ | |
711 | DoC_Command(docptr, NAND_CMD_RESET, CDSN_CTRL_WP); | |
712 | DoC_WaitReady(docptr); | |
713 | /* issue the Read2 command to set the pointer to the Spare Data Area. */ | |
714 | DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP); | |
715 | ||
716 | /* issue the Serial Data In command to initial the Page Program process */ | |
717 | DoC_Command(docptr, NAND_CMD_SEQIN, 0x00); | |
718 | DoC_Address(docptr, 3, ofs, 0x00, 0x00); | |
719 | ||
720 | /* Write the data via the internal pipeline through CDSN IO register, | |
721 | see Pipelined Write Operations 11.2 */ | |
722 | #ifndef USE_MEMCPY | |
723 | for (i = 0; i < len; i++) { | |
724 | /* N.B. you have to increase the source address in this way or the | |
725 | ECC logic will not work properly */ | |
726 | WriteDOC(buf[i], docptr, Mil_CDSN_IO + i); | |
727 | } | |
728 | #else | |
729 | memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len); | |
730 | #endif | |
731 | WriteDOC(0x00, docptr, WritePipeTerm); | |
732 | ||
733 | /* Commit the Page Program command and wait for ready | |
734 | see Software Requirement 11.4 item 1.*/ | |
735 | DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00); | |
736 | DoC_WaitReady(docptr); | |
737 | ||
738 | /* Read the status of the flash device through CDSN IO register | |
739 | see Software Requirement 11.4 item 5.*/ | |
740 | DoC_Command(docptr, NAND_CMD_STATUS, 0x00); | |
741 | dummy = ReadDOC(docptr, ReadPipeInit); | |
742 | DoC_Delay(docptr, 2); | |
743 | if (ReadDOC(docptr, Mil_CDSN_IO) & 1) { | |
744 | printk("Error programming oob data\n"); | |
745 | /* FIXME: implement Bad Block Replacement (in nftl.c ??) */ | |
8593fbc6 | 746 | ops->retlen = 0; |
1da177e4 LT |
747 | ret = -EIO; |
748 | } | |
749 | dummy = ReadDOC(docptr, LastDataRead); | |
750 | ||
8593fbc6 | 751 | ops->retlen = len; |
1da177e4 LT |
752 | |
753 | return ret; | |
754 | } | |
755 | ||
756 | int doc_erase (struct mtd_info *mtd, struct erase_info *instr) | |
757 | { | |
758 | volatile char dummy; | |
759 | struct DiskOnChip *this = mtd->priv; | |
760 | __u32 ofs = instr->addr; | |
761 | __u32 len = instr->len; | |
762 | void __iomem *docptr = this->virtadr; | |
763 | struct Nand *mychip = &this->chips[ofs >> this->chipshift]; | |
764 | ||
e5580fbe | 765 | if (len != mtd->erasesize) |
1da177e4 LT |
766 | printk(KERN_WARNING "Erase not right size (%x != %x)n", |
767 | len, mtd->erasesize); | |
768 | ||
769 | /* Find the chip which is to be used and select it */ | |
770 | if (this->curfloor != mychip->floor) { | |
771 | DoC_SelectFloor(docptr, mychip->floor); | |
772 | DoC_SelectChip(docptr, mychip->chip); | |
773 | } else if (this->curchip != mychip->chip) { | |
774 | DoC_SelectChip(docptr, mychip->chip); | |
775 | } | |
776 | this->curfloor = mychip->floor; | |
777 | this->curchip = mychip->chip; | |
778 | ||
779 | instr->state = MTD_ERASE_PENDING; | |
780 | ||
781 | /* issue the Erase Setup command */ | |
782 | DoC_Command(docptr, NAND_CMD_ERASE1, 0x00); | |
783 | DoC_Address(docptr, 2, ofs, 0x00, 0x00); | |
784 | ||
785 | /* Commit the Erase Start command and wait for ready | |
786 | see Software Requirement 11.4 item 1.*/ | |
787 | DoC_Command(docptr, NAND_CMD_ERASE2, 0x00); | |
788 | DoC_WaitReady(docptr); | |
789 | ||
790 | instr->state = MTD_ERASING; | |
791 | ||
792 | /* Read the status of the flash device through CDSN IO register | |
793 | see Software Requirement 11.4 item 5. | |
794 | FIXME: it seems that we are not wait long enough, some blocks are not | |
795 | erased fully */ | |
796 | DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP); | |
797 | dummy = ReadDOC(docptr, ReadPipeInit); | |
798 | DoC_Delay(docptr, 2); | |
799 | if (ReadDOC(docptr, Mil_CDSN_IO) & 1) { | |
800 | printk("Error Erasing at 0x%x\n", ofs); | |
801 | /* There was an error | |
802 | FIXME: implement Bad Block Replacement (in nftl.c ??) */ | |
803 | instr->state = MTD_ERASE_FAILED; | |
804 | } else | |
805 | instr->state = MTD_ERASE_DONE; | |
806 | dummy = ReadDOC(docptr, LastDataRead); | |
807 | ||
808 | mtd_erase_callback(instr); | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | /**************************************************************************** | |
814 | * | |
815 | * Module stuff | |
816 | * | |
817 | ****************************************************************************/ | |
818 | ||
1da177e4 LT |
819 | static void __exit cleanup_doc2001(void) |
820 | { | |
821 | struct mtd_info *mtd; | |
822 | struct DiskOnChip *this; | |
823 | ||
824 | while ((mtd=docmillist)) { | |
825 | this = mtd->priv; | |
826 | docmillist = this->nextdoc; | |
e5580fbe | 827 | |
ee0e87b1 | 828 | mtd_device_unregister(mtd); |
e5580fbe | 829 | |
1da177e4 LT |
830 | iounmap(this->virtadr); |
831 | kfree(this->chips); | |
832 | kfree(mtd); | |
833 | } | |
1da177e4 LT |
834 | } |
835 | ||
836 | module_exit(cleanup_doc2001); | |
1da177e4 LT |
837 | |
838 | MODULE_LICENSE("GPL"); | |
839 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al."); | |
840 | MODULE_DESCRIPTION("Alternative driver for DiskOnChip Millennium"); |