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570469f3 MD |
1 | /* |
2 | * Copyright © 2012 Mike Dunn <mikedunn@newsguy.com> | |
3 | * | |
4 | * mtd nand driver for M-Systems DiskOnChip G4 | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * Tested on the Palm Treo 680. The G4 is also present on Toshiba Portege, Asus | |
12 | * P526, some HTC smartphones (Wizard, Prophet, ...), O2 XDA Zinc, maybe others. | |
13 | * Should work on these as well. Let me know! | |
14 | * | |
15 | * TODO: | |
16 | * | |
17 | * Mechanism for management of password-protected areas | |
18 | * | |
19 | * Hamming ecc when reading oob only | |
20 | * | |
21 | * According to the M-Sys documentation, this device is also available in a | |
22 | * "dual-die" configuration having a 256MB capacity, but no mechanism for | |
23 | * detecting this variant is documented. Currently this driver assumes 128MB | |
24 | * capacity. | |
25 | * | |
26 | * Support for multiple cascaded devices ("floors"). Not sure which gadgets | |
27 | * contain multiple G4s in a cascaded configuration, if any. | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <linux/kernel.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/delay.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/export.h> | |
39 | #include <linux/platform_device.h> | |
40 | #include <linux/io.h> | |
41 | #include <linux/bitops.h> | |
42 | #include <linux/mtd/partitions.h> | |
43 | #include <linux/mtd/mtd.h> | |
44 | #include <linux/mtd/nand.h> | |
45 | #include <linux/bch.h> | |
46 | #include <linux/bitrev.h> | |
47 | ||
5a90d41b MD |
48 | /* |
49 | * In "reliable mode" consecutive 2k pages are used in parallel (in some | |
50 | * fashion) to store the same data. The data can be read back from the | |
51 | * even-numbered pages in the normal manner; odd-numbered pages will appear to | |
52 | * contain junk. Systems that boot from the docg4 typically write the secondary | |
53 | * program loader (SPL) code in this mode. The SPL is loaded by the initial | |
54 | * program loader (IPL, stored in the docg4's 2k NOR-like region that is mapped | |
55 | * to the reset vector address). This module parameter enables you to use this | |
56 | * driver to write the SPL. When in this mode, no more than 2k of data can be | |
57 | * written at a time, because the addresses do not increment in the normal | |
58 | * manner, and the starting offset must be within an even-numbered 2k region; | |
59 | * i.e., invalid starting offsets are 0x800, 0xa00, 0xc00, 0xe00, 0x1800, | |
60 | * 0x1a00, ... Reliable mode is a special case and should not be used unless | |
61 | * you know what you're doing. | |
62 | */ | |
63 | static bool reliable_mode; | |
64 | module_param(reliable_mode, bool, 0); | |
65 | MODULE_PARM_DESC(reliable_mode, "pages are programmed in reliable mode"); | |
66 | ||
570469f3 MD |
67 | /* |
68 | * You'll want to ignore badblocks if you're reading a partition that contains | |
69 | * data written by the TrueFFS library (i.e., by PalmOS, Windows, etc), since | |
70 | * it does not use mtd nand's method for marking bad blocks (using oob area). | |
71 | * This will also skip the check of the "page written" flag. | |
72 | */ | |
73 | static bool ignore_badblocks; | |
74 | module_param(ignore_badblocks, bool, 0); | |
75 | MODULE_PARM_DESC(ignore_badblocks, "no badblock checking performed"); | |
76 | ||
77 | struct docg4_priv { | |
78 | struct mtd_info *mtd; | |
79 | struct device *dev; | |
80 | void __iomem *virtadr; | |
81 | int status; | |
82 | struct { | |
83 | unsigned int command; | |
84 | int column; | |
85 | int page; | |
86 | } last_command; | |
87 | uint8_t oob_buf[16]; | |
88 | uint8_t ecc_buf[7]; | |
89 | int oob_page; | |
90 | struct bch_control *bch; | |
91 | }; | |
92 | ||
93 | /* | |
94 | * Defines prefixed with DOCG4 are unique to the diskonchip G4. All others are | |
95 | * shared with other diskonchip devices (P3, G3 at least). | |
96 | * | |
97 | * Functions with names prefixed with docg4_ are mtd / nand interface functions | |
98 | * (though they may also be called internally). All others are internal. | |
99 | */ | |
100 | ||
101 | #define DOC_IOSPACE_DATA 0x0800 | |
102 | ||
103 | /* register offsets */ | |
104 | #define DOC_CHIPID 0x1000 | |
105 | #define DOC_DEVICESELECT 0x100a | |
106 | #define DOC_ASICMODE 0x100c | |
107 | #define DOC_DATAEND 0x101e | |
108 | #define DOC_NOP 0x103e | |
109 | ||
110 | #define DOC_FLASHSEQUENCE 0x1032 | |
111 | #define DOC_FLASHCOMMAND 0x1034 | |
112 | #define DOC_FLASHADDRESS 0x1036 | |
113 | #define DOC_FLASHCONTROL 0x1038 | |
114 | #define DOC_ECCCONF0 0x1040 | |
115 | #define DOC_ECCCONF1 0x1042 | |
116 | #define DOC_HAMMINGPARITY 0x1046 | |
117 | #define DOC_BCH_SYNDROM(idx) (0x1048 + idx) | |
118 | ||
119 | #define DOC_ASICMODECONFIRM 0x1072 | |
120 | #define DOC_CHIPID_INV 0x1074 | |
121 | #define DOC_POWERMODE 0x107c | |
122 | ||
123 | #define DOCG4_MYSTERY_REG 0x1050 | |
124 | ||
125 | /* apparently used only to write oob bytes 6 and 7 */ | |
126 | #define DOCG4_OOB_6_7 0x1052 | |
127 | ||
128 | /* DOC_FLASHSEQUENCE register commands */ | |
129 | #define DOC_SEQ_RESET 0x00 | |
130 | #define DOCG4_SEQ_PAGE_READ 0x03 | |
131 | #define DOCG4_SEQ_FLUSH 0x29 | |
132 | #define DOCG4_SEQ_PAGEWRITE 0x16 | |
133 | #define DOCG4_SEQ_PAGEPROG 0x1e | |
134 | #define DOCG4_SEQ_BLOCKERASE 0x24 | |
5a90d41b | 135 | #define DOCG4_SEQ_SETMODE 0x45 |
570469f3 MD |
136 | |
137 | /* DOC_FLASHCOMMAND register commands */ | |
138 | #define DOCG4_CMD_PAGE_READ 0x00 | |
139 | #define DOC_CMD_ERASECYCLE2 0xd0 | |
140 | #define DOCG4_CMD_FLUSH 0x70 | |
141 | #define DOCG4_CMD_READ2 0x30 | |
142 | #define DOC_CMD_PROG_BLOCK_ADDR 0x60 | |
143 | #define DOCG4_CMD_PAGEWRITE 0x80 | |
144 | #define DOC_CMD_PROG_CYCLE2 0x10 | |
5a90d41b MD |
145 | #define DOCG4_CMD_FAST_MODE 0xa3 /* functionality guessed */ |
146 | #define DOC_CMD_RELIABLE_MODE 0x22 | |
570469f3 MD |
147 | #define DOC_CMD_RESET 0xff |
148 | ||
149 | /* DOC_POWERMODE register bits */ | |
150 | #define DOC_POWERDOWN_READY 0x80 | |
151 | ||
152 | /* DOC_FLASHCONTROL register bits */ | |
153 | #define DOC_CTRL_CE 0x10 | |
154 | #define DOC_CTRL_UNKNOWN 0x40 | |
155 | #define DOC_CTRL_FLASHREADY 0x01 | |
156 | ||
157 | /* DOC_ECCCONF0 register bits */ | |
158 | #define DOC_ECCCONF0_READ_MODE 0x8000 | |
159 | #define DOC_ECCCONF0_UNKNOWN 0x2000 | |
160 | #define DOC_ECCCONF0_ECC_ENABLE 0x1000 | |
161 | #define DOC_ECCCONF0_DATA_BYTES_MASK 0x07ff | |
162 | ||
163 | /* DOC_ECCCONF1 register bits */ | |
164 | #define DOC_ECCCONF1_BCH_SYNDROM_ERR 0x80 | |
165 | #define DOC_ECCCONF1_ECC_ENABLE 0x07 | |
166 | #define DOC_ECCCONF1_PAGE_IS_WRITTEN 0x20 | |
167 | ||
168 | /* DOC_ASICMODE register bits */ | |
169 | #define DOC_ASICMODE_RESET 0x00 | |
170 | #define DOC_ASICMODE_NORMAL 0x01 | |
171 | #define DOC_ASICMODE_POWERDOWN 0x02 | |
172 | #define DOC_ASICMODE_MDWREN 0x04 | |
173 | #define DOC_ASICMODE_BDETCT_RESET 0x08 | |
174 | #define DOC_ASICMODE_RSTIN_RESET 0x10 | |
175 | #define DOC_ASICMODE_RAM_WE 0x20 | |
176 | ||
177 | /* good status values read after read/write/erase operations */ | |
178 | #define DOCG4_PROGSTATUS_GOOD 0x51 | |
179 | #define DOCG4_PROGSTATUS_GOOD_2 0xe0 | |
180 | ||
181 | /* | |
182 | * On read operations (page and oob-only), the first byte read from I/O reg is a | |
183 | * status. On error, it reads 0x73; otherwise, it reads either 0x71 (first read | |
184 | * after reset only) or 0x51, so bit 1 is presumed to be an error indicator. | |
185 | */ | |
186 | #define DOCG4_READ_ERROR 0x02 /* bit 1 indicates read error */ | |
187 | ||
188 | /* anatomy of the device */ | |
189 | #define DOCG4_CHIP_SIZE 0x8000000 | |
190 | #define DOCG4_PAGE_SIZE 0x200 | |
191 | #define DOCG4_PAGES_PER_BLOCK 0x200 | |
192 | #define DOCG4_BLOCK_SIZE (DOCG4_PAGES_PER_BLOCK * DOCG4_PAGE_SIZE) | |
193 | #define DOCG4_NUMBLOCKS (DOCG4_CHIP_SIZE / DOCG4_BLOCK_SIZE) | |
194 | #define DOCG4_OOB_SIZE 0x10 | |
195 | #define DOCG4_CHIP_SHIFT 27 /* log_2(DOCG4_CHIP_SIZE) */ | |
196 | #define DOCG4_PAGE_SHIFT 9 /* log_2(DOCG4_PAGE_SIZE) */ | |
197 | #define DOCG4_ERASE_SHIFT 18 /* log_2(DOCG4_BLOCK_SIZE) */ | |
198 | ||
199 | /* all but the last byte is included in ecc calculation */ | |
200 | #define DOCG4_BCH_SIZE (DOCG4_PAGE_SIZE + DOCG4_OOB_SIZE - 1) | |
201 | ||
202 | #define DOCG4_USERDATA_LEN 520 /* 512 byte page plus 8 oob avail to user */ | |
203 | ||
204 | /* expected values from the ID registers */ | |
205 | #define DOCG4_IDREG1_VALUE 0x0400 | |
206 | #define DOCG4_IDREG2_VALUE 0xfbff | |
207 | ||
208 | /* primitive polynomial used to build the Galois field used by hw ecc gen */ | |
209 | #define DOCG4_PRIMITIVE_POLY 0x4443 | |
210 | ||
211 | #define DOCG4_M 14 /* Galois field is of order 2^14 */ | |
212 | #define DOCG4_T 4 /* BCH alg corrects up to 4 bit errors */ | |
213 | ||
214 | #define DOCG4_FACTORY_BBT_PAGE 16 /* page where read-only factory bbt lives */ | |
3c9c6d65 | 215 | #define DOCG4_REDUNDANT_BBT_PAGE 24 /* page where redundant factory bbt lives */ |
570469f3 MD |
216 | |
217 | /* | |
440b1d73 MD |
218 | * Bytes 0, 1 are used as badblock marker. |
219 | * Bytes 2 - 6 are available to the user. | |
220 | * Byte 7 is hamming ecc for first 7 oob bytes only. | |
221 | * Bytes 8 - 14 are hw-generated ecc covering entire page + oob bytes 0 - 14. | |
570469f3 MD |
222 | * Byte 15 (the last) is used by the driver as a "page written" flag. |
223 | */ | |
224 | static struct nand_ecclayout docg4_oobinfo = { | |
225 | .eccbytes = 9, | |
226 | .eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15}, | |
440b1d73 MD |
227 | .oobavail = 5, |
228 | .oobfree = { {.offset = 2, .length = 5} } | |
570469f3 MD |
229 | }; |
230 | ||
231 | /* | |
232 | * The device has a nop register which M-Sys claims is for the purpose of | |
233 | * inserting precise delays. But beware; at least some operations fail if the | |
234 | * nop writes are replaced with a generic delay! | |
235 | */ | |
236 | static inline void write_nop(void __iomem *docptr) | |
237 | { | |
238 | writew(0, docptr + DOC_NOP); | |
239 | } | |
240 | ||
241 | static void docg4_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) | |
242 | { | |
243 | int i; | |
244 | struct nand_chip *nand = mtd->priv; | |
245 | uint16_t *p = (uint16_t *) buf; | |
246 | len >>= 1; | |
247 | ||
248 | for (i = 0; i < len; i++) | |
249 | p[i] = readw(nand->IO_ADDR_R); | |
250 | } | |
251 | ||
252 | static void docg4_write_buf16(struct mtd_info *mtd, const uint8_t *buf, int len) | |
253 | { | |
254 | int i; | |
255 | struct nand_chip *nand = mtd->priv; | |
256 | uint16_t *p = (uint16_t *) buf; | |
257 | len >>= 1; | |
258 | ||
259 | for (i = 0; i < len; i++) | |
260 | writew(p[i], nand->IO_ADDR_W); | |
261 | } | |
262 | ||
263 | static int poll_status(struct docg4_priv *doc) | |
264 | { | |
265 | /* | |
266 | * Busy-wait for the FLASHREADY bit to be set in the FLASHCONTROL | |
267 | * register. Operations known to take a long time (e.g., block erase) | |
268 | * should sleep for a while before calling this. | |
269 | */ | |
270 | ||
271 | uint16_t flash_status; | |
272 | unsigned int timeo; | |
273 | void __iomem *docptr = doc->virtadr; | |
274 | ||
275 | dev_dbg(doc->dev, "%s...\n", __func__); | |
276 | ||
277 | /* hardware quirk requires reading twice initially */ | |
278 | flash_status = readw(docptr + DOC_FLASHCONTROL); | |
279 | ||
280 | timeo = 1000; | |
281 | do { | |
282 | cpu_relax(); | |
283 | flash_status = readb(docptr + DOC_FLASHCONTROL); | |
284 | } while (!(flash_status & DOC_CTRL_FLASHREADY) && --timeo); | |
285 | ||
286 | ||
287 | if (!timeo) { | |
288 | dev_err(doc->dev, "%s: timed out!\n", __func__); | |
289 | return NAND_STATUS_FAIL; | |
290 | } | |
291 | ||
292 | if (unlikely(timeo < 50)) | |
293 | dev_warn(doc->dev, "%s: nearly timed out; %d remaining\n", | |
294 | __func__, timeo); | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | ||
300 | static int docg4_wait(struct mtd_info *mtd, struct nand_chip *nand) | |
301 | { | |
302 | ||
303 | struct docg4_priv *doc = nand->priv; | |
304 | int status = NAND_STATUS_WP; /* inverse logic?? */ | |
305 | dev_dbg(doc->dev, "%s...\n", __func__); | |
306 | ||
307 | /* report any previously unreported error */ | |
308 | if (doc->status) { | |
309 | status |= doc->status; | |
310 | doc->status = 0; | |
311 | return status; | |
312 | } | |
313 | ||
314 | status |= poll_status(doc); | |
315 | return status; | |
316 | } | |
317 | ||
318 | static void docg4_select_chip(struct mtd_info *mtd, int chip) | |
319 | { | |
320 | /* | |
321 | * Select among multiple cascaded chips ("floors"). Multiple floors are | |
322 | * not yet supported, so the only valid non-negative value is 0. | |
323 | */ | |
324 | struct nand_chip *nand = mtd->priv; | |
325 | struct docg4_priv *doc = nand->priv; | |
326 | void __iomem *docptr = doc->virtadr; | |
327 | ||
328 | dev_dbg(doc->dev, "%s: chip %d\n", __func__, chip); | |
329 | ||
330 | if (chip < 0) | |
331 | return; /* deselected */ | |
332 | ||
333 | if (chip > 0) | |
334 | dev_warn(doc->dev, "multiple floors currently unsupported\n"); | |
335 | ||
336 | writew(0, docptr + DOC_DEVICESELECT); | |
337 | } | |
338 | ||
339 | static void reset(struct mtd_info *mtd) | |
340 | { | |
341 | /* full device reset */ | |
342 | ||
343 | struct nand_chip *nand = mtd->priv; | |
344 | struct docg4_priv *doc = nand->priv; | |
345 | void __iomem *docptr = doc->virtadr; | |
346 | ||
347 | writew(DOC_ASICMODE_RESET | DOC_ASICMODE_MDWREN, | |
348 | docptr + DOC_ASICMODE); | |
349 | writew(~(DOC_ASICMODE_RESET | DOC_ASICMODE_MDWREN), | |
350 | docptr + DOC_ASICMODECONFIRM); | |
351 | write_nop(docptr); | |
352 | ||
353 | writew(DOC_ASICMODE_NORMAL | DOC_ASICMODE_MDWREN, | |
354 | docptr + DOC_ASICMODE); | |
355 | writew(~(DOC_ASICMODE_NORMAL | DOC_ASICMODE_MDWREN), | |
356 | docptr + DOC_ASICMODECONFIRM); | |
357 | ||
358 | writew(DOC_ECCCONF1_ECC_ENABLE, docptr + DOC_ECCCONF1); | |
359 | ||
360 | poll_status(doc); | |
361 | } | |
362 | ||
363 | static void read_hw_ecc(void __iomem *docptr, uint8_t *ecc_buf) | |
364 | { | |
365 | /* read the 7 hw-generated ecc bytes */ | |
366 | ||
367 | int i; | |
368 | for (i = 0; i < 7; i++) { /* hw quirk; read twice */ | |
369 | ecc_buf[i] = readb(docptr + DOC_BCH_SYNDROM(i)); | |
370 | ecc_buf[i] = readb(docptr + DOC_BCH_SYNDROM(i)); | |
371 | } | |
372 | } | |
373 | ||
374 | static int correct_data(struct mtd_info *mtd, uint8_t *buf, int page) | |
375 | { | |
376 | /* | |
377 | * Called after a page read when hardware reports bitflips. | |
378 | * Up to four bitflips can be corrected. | |
379 | */ | |
380 | ||
381 | struct nand_chip *nand = mtd->priv; | |
382 | struct docg4_priv *doc = nand->priv; | |
383 | void __iomem *docptr = doc->virtadr; | |
384 | int i, numerrs, errpos[4]; | |
385 | const uint8_t blank_read_hwecc[8] = { | |
386 | 0xcf, 0x72, 0xfc, 0x1b, 0xa9, 0xc7, 0xb9, 0 }; | |
387 | ||
388 | read_hw_ecc(docptr, doc->ecc_buf); /* read 7 hw-generated ecc bytes */ | |
389 | ||
390 | /* check if read error is due to a blank page */ | |
391 | if (!memcmp(doc->ecc_buf, blank_read_hwecc, 7)) | |
392 | return 0; /* yes */ | |
393 | ||
394 | /* skip additional check of "written flag" if ignore_badblocks */ | |
395 | if (ignore_badblocks == false) { | |
396 | ||
397 | /* | |
398 | * If the hw ecc bytes are not those of a blank page, there's | |
399 | * still a chance that the page is blank, but was read with | |
400 | * errors. Check the "written flag" in last oob byte, which | |
401 | * is set to zero when a page is written. If more than half | |
402 | * the bits are set, assume a blank page. Unfortunately, the | |
403 | * bit flips(s) are not reported in stats. | |
404 | */ | |
405 | ||
aa6d01fa | 406 | if (nand->oob_poi[15]) { |
570469f3 | 407 | int bit, numsetbits = 0; |
aa6d01fa | 408 | unsigned long written_flag = nand->oob_poi[15]; |
570469f3 MD |
409 | for_each_set_bit(bit, &written_flag, 8) |
410 | numsetbits++; | |
411 | if (numsetbits > 4) { /* assume blank */ | |
412 | dev_warn(doc->dev, | |
413 | "error(s) in blank page " | |
414 | "at offset %08x\n", | |
415 | page * DOCG4_PAGE_SIZE); | |
416 | return 0; | |
417 | } | |
418 | } | |
419 | } | |
420 | ||
421 | /* | |
422 | * The hardware ecc unit produces oob_ecc ^ calc_ecc. The kernel's bch | |
423 | * algorithm is used to decode this. However the hw operates on page | |
424 | * data in a bit order that is the reverse of that of the bch alg, | |
425 | * requiring that the bits be reversed on the result. Thanks to Ivan | |
426 | * Djelic for his analysis! | |
427 | */ | |
428 | for (i = 0; i < 7; i++) | |
429 | doc->ecc_buf[i] = bitrev8(doc->ecc_buf[i]); | |
430 | ||
431 | numerrs = decode_bch(doc->bch, NULL, DOCG4_USERDATA_LEN, NULL, | |
432 | doc->ecc_buf, NULL, errpos); | |
433 | ||
434 | if (numerrs == -EBADMSG) { | |
435 | dev_warn(doc->dev, "uncorrectable errors at offset %08x\n", | |
436 | page * DOCG4_PAGE_SIZE); | |
437 | return -EBADMSG; | |
438 | } | |
439 | ||
440 | BUG_ON(numerrs < 0); /* -EINVAL, or anything other than -EBADMSG */ | |
441 | ||
442 | /* undo last step in BCH alg (modulo mirroring not needed) */ | |
443 | for (i = 0; i < numerrs; i++) | |
444 | errpos[i] = (errpos[i] & ~7)|(7-(errpos[i] & 7)); | |
445 | ||
446 | /* fix the errors */ | |
447 | for (i = 0; i < numerrs; i++) { | |
448 | ||
449 | /* ignore if error within oob ecc bytes */ | |
450 | if (errpos[i] > DOCG4_USERDATA_LEN * 8) | |
451 | continue; | |
452 | ||
453 | /* if error within oob area preceeding ecc bytes... */ | |
454 | if (errpos[i] > DOCG4_PAGE_SIZE * 8) | |
455 | change_bit(errpos[i] - DOCG4_PAGE_SIZE * 8, | |
aa6d01fa | 456 | (unsigned long *)nand->oob_poi); |
570469f3 MD |
457 | |
458 | else /* error in page data */ | |
459 | change_bit(errpos[i], (unsigned long *)buf); | |
460 | } | |
461 | ||
462 | dev_notice(doc->dev, "%d error(s) corrected at offset %08x\n", | |
463 | numerrs, page * DOCG4_PAGE_SIZE); | |
464 | ||
465 | return numerrs; | |
466 | } | |
467 | ||
468 | static uint8_t docg4_read_byte(struct mtd_info *mtd) | |
469 | { | |
470 | struct nand_chip *nand = mtd->priv; | |
471 | struct docg4_priv *doc = nand->priv; | |
472 | ||
473 | dev_dbg(doc->dev, "%s\n", __func__); | |
474 | ||
475 | if (doc->last_command.command == NAND_CMD_STATUS) { | |
476 | int status; | |
477 | ||
478 | /* | |
479 | * Previous nand command was status request, so nand | |
480 | * infrastructure code expects to read the status here. If an | |
481 | * error occurred in a previous operation, report it. | |
482 | */ | |
483 | doc->last_command.command = 0; | |
484 | ||
485 | if (doc->status) { | |
486 | status = doc->status; | |
487 | doc->status = 0; | |
488 | } | |
489 | ||
490 | /* why is NAND_STATUS_WP inverse logic?? */ | |
491 | else | |
492 | status = NAND_STATUS_WP | NAND_STATUS_READY; | |
493 | ||
494 | return status; | |
495 | } | |
496 | ||
497 | dev_warn(doc->dev, "unexpectd call to read_byte()\n"); | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | static void write_addr(struct docg4_priv *doc, uint32_t docg4_addr) | |
503 | { | |
504 | /* write the four address bytes packed in docg4_addr to the device */ | |
505 | ||
506 | void __iomem *docptr = doc->virtadr; | |
507 | writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS); | |
508 | docg4_addr >>= 8; | |
509 | writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS); | |
510 | docg4_addr >>= 8; | |
511 | writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS); | |
512 | docg4_addr >>= 8; | |
513 | writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS); | |
514 | } | |
515 | ||
516 | static int read_progstatus(struct docg4_priv *doc) | |
517 | { | |
518 | /* | |
519 | * This apparently checks the status of programming. Done after an | |
520 | * erasure, and after page data is written. On error, the status is | |
521 | * saved, to be later retrieved by the nand infrastructure code. | |
522 | */ | |
523 | void __iomem *docptr = doc->virtadr; | |
524 | ||
525 | /* status is read from the I/O reg */ | |
526 | uint16_t status1 = readw(docptr + DOC_IOSPACE_DATA); | |
527 | uint16_t status2 = readw(docptr + DOC_IOSPACE_DATA); | |
528 | uint16_t status3 = readw(docptr + DOCG4_MYSTERY_REG); | |
529 | ||
530 | dev_dbg(doc->dev, "docg4: %s: %02x %02x %02x\n", | |
531 | __func__, status1, status2, status3); | |
532 | ||
533 | if (status1 != DOCG4_PROGSTATUS_GOOD | |
534 | || status2 != DOCG4_PROGSTATUS_GOOD_2 | |
535 | || status3 != DOCG4_PROGSTATUS_GOOD_2) { | |
536 | doc->status = NAND_STATUS_FAIL; | |
537 | dev_warn(doc->dev, "read_progstatus failed: " | |
538 | "%02x, %02x, %02x\n", status1, status2, status3); | |
539 | return -EIO; | |
540 | } | |
541 | return 0; | |
542 | } | |
543 | ||
544 | static int pageprog(struct mtd_info *mtd) | |
545 | { | |
546 | /* | |
547 | * Final step in writing a page. Writes the contents of its | |
548 | * internal buffer out to the flash array, or some such. | |
549 | */ | |
550 | ||
551 | struct nand_chip *nand = mtd->priv; | |
552 | struct docg4_priv *doc = nand->priv; | |
553 | void __iomem *docptr = doc->virtadr; | |
554 | int retval = 0; | |
555 | ||
556 | dev_dbg(doc->dev, "docg4: %s\n", __func__); | |
557 | ||
558 | writew(DOCG4_SEQ_PAGEPROG, docptr + DOC_FLASHSEQUENCE); | |
559 | writew(DOC_CMD_PROG_CYCLE2, docptr + DOC_FLASHCOMMAND); | |
560 | write_nop(docptr); | |
561 | write_nop(docptr); | |
562 | ||
563 | /* Just busy-wait; usleep_range() slows things down noticeably. */ | |
564 | poll_status(doc); | |
565 | ||
566 | writew(DOCG4_SEQ_FLUSH, docptr + DOC_FLASHSEQUENCE); | |
567 | writew(DOCG4_CMD_FLUSH, docptr + DOC_FLASHCOMMAND); | |
568 | writew(DOC_ECCCONF0_READ_MODE | 4, docptr + DOC_ECCCONF0); | |
569 | write_nop(docptr); | |
570 | write_nop(docptr); | |
571 | write_nop(docptr); | |
572 | write_nop(docptr); | |
573 | write_nop(docptr); | |
574 | ||
575 | retval = read_progstatus(doc); | |
576 | writew(0, docptr + DOC_DATAEND); | |
577 | write_nop(docptr); | |
578 | poll_status(doc); | |
579 | write_nop(docptr); | |
580 | ||
581 | return retval; | |
582 | } | |
583 | ||
584 | static void sequence_reset(struct mtd_info *mtd) | |
585 | { | |
586 | /* common starting sequence for all operations */ | |
587 | ||
588 | struct nand_chip *nand = mtd->priv; | |
589 | struct docg4_priv *doc = nand->priv; | |
590 | void __iomem *docptr = doc->virtadr; | |
591 | ||
592 | writew(DOC_CTRL_UNKNOWN | DOC_CTRL_CE, docptr + DOC_FLASHCONTROL); | |
593 | writew(DOC_SEQ_RESET, docptr + DOC_FLASHSEQUENCE); | |
594 | writew(DOC_CMD_RESET, docptr + DOC_FLASHCOMMAND); | |
595 | write_nop(docptr); | |
596 | write_nop(docptr); | |
597 | poll_status(doc); | |
598 | write_nop(docptr); | |
599 | } | |
600 | ||
601 | static void read_page_prologue(struct mtd_info *mtd, uint32_t docg4_addr) | |
602 | { | |
603 | /* first step in reading a page */ | |
604 | ||
605 | struct nand_chip *nand = mtd->priv; | |
606 | struct docg4_priv *doc = nand->priv; | |
607 | void __iomem *docptr = doc->virtadr; | |
608 | ||
609 | dev_dbg(doc->dev, | |
610 | "docg4: %s: g4 page %08x\n", __func__, docg4_addr); | |
611 | ||
612 | sequence_reset(mtd); | |
613 | ||
614 | writew(DOCG4_SEQ_PAGE_READ, docptr + DOC_FLASHSEQUENCE); | |
615 | writew(DOCG4_CMD_PAGE_READ, docptr + DOC_FLASHCOMMAND); | |
616 | write_nop(docptr); | |
617 | ||
618 | write_addr(doc, docg4_addr); | |
619 | ||
620 | write_nop(docptr); | |
621 | writew(DOCG4_CMD_READ2, docptr + DOC_FLASHCOMMAND); | |
622 | write_nop(docptr); | |
623 | write_nop(docptr); | |
624 | ||
625 | poll_status(doc); | |
626 | } | |
627 | ||
628 | static void write_page_prologue(struct mtd_info *mtd, uint32_t docg4_addr) | |
629 | { | |
630 | /* first step in writing a page */ | |
631 | ||
632 | struct nand_chip *nand = mtd->priv; | |
633 | struct docg4_priv *doc = nand->priv; | |
634 | void __iomem *docptr = doc->virtadr; | |
635 | ||
636 | dev_dbg(doc->dev, | |
637 | "docg4: %s: g4 addr: %x\n", __func__, docg4_addr); | |
638 | sequence_reset(mtd); | |
5a90d41b MD |
639 | |
640 | if (unlikely(reliable_mode)) { | |
641 | writew(DOCG4_SEQ_SETMODE, docptr + DOC_FLASHSEQUENCE); | |
642 | writew(DOCG4_CMD_FAST_MODE, docptr + DOC_FLASHCOMMAND); | |
643 | writew(DOC_CMD_RELIABLE_MODE, docptr + DOC_FLASHCOMMAND); | |
644 | write_nop(docptr); | |
645 | } | |
646 | ||
570469f3 MD |
647 | writew(DOCG4_SEQ_PAGEWRITE, docptr + DOC_FLASHSEQUENCE); |
648 | writew(DOCG4_CMD_PAGEWRITE, docptr + DOC_FLASHCOMMAND); | |
649 | write_nop(docptr); | |
650 | write_addr(doc, docg4_addr); | |
651 | write_nop(docptr); | |
652 | write_nop(docptr); | |
653 | poll_status(doc); | |
654 | } | |
655 | ||
656 | static uint32_t mtd_to_docg4_address(int page, int column) | |
657 | { | |
658 | /* | |
659 | * Convert mtd address to format used by the device, 32 bit packed. | |
660 | * | |
661 | * Some notes on G4 addressing... The M-Sys documentation on this device | |
662 | * claims that pages are 2K in length, and indeed, the format of the | |
663 | * address used by the device reflects that. But within each page are | |
664 | * four 512 byte "sub-pages", each with its own oob data that is | |
665 | * read/written immediately after the 512 bytes of page data. This oob | |
666 | * data contains the ecc bytes for the preceeding 512 bytes. | |
667 | * | |
668 | * Rather than tell the mtd nand infrastructure that page size is 2k, | |
669 | * with four sub-pages each, we engage in a little subterfuge and tell | |
670 | * the infrastructure code that pages are 512 bytes in size. This is | |
671 | * done because during the course of reverse-engineering the device, I | |
672 | * never observed an instance where an entire 2K "page" was read or | |
673 | * written as a unit. Each "sub-page" is always addressed individually, | |
674 | * its data read/written, and ecc handled before the next "sub-page" is | |
675 | * addressed. | |
676 | * | |
677 | * This requires us to convert addresses passed by the mtd nand | |
678 | * infrastructure code to those used by the device. | |
679 | * | |
680 | * The address that is written to the device consists of four bytes: the | |
681 | * first two are the 2k page number, and the second is the index into | |
682 | * the page. The index is in terms of 16-bit half-words and includes | |
683 | * the preceeding oob data, so e.g., the index into the second | |
684 | * "sub-page" is 0x108, and the full device address of the start of mtd | |
685 | * page 0x201 is 0x00800108. | |
686 | */ | |
687 | int g4_page = page / 4; /* device's 2K page */ | |
688 | int g4_index = (page % 4) * 0x108 + column/2; /* offset into page */ | |
689 | return (g4_page << 16) | g4_index; /* pack */ | |
690 | } | |
691 | ||
692 | static void docg4_command(struct mtd_info *mtd, unsigned command, int column, | |
693 | int page_addr) | |
694 | { | |
695 | /* handle standard nand commands */ | |
696 | ||
697 | struct nand_chip *nand = mtd->priv; | |
698 | struct docg4_priv *doc = nand->priv; | |
699 | uint32_t g4_addr = mtd_to_docg4_address(page_addr, column); | |
700 | ||
701 | dev_dbg(doc->dev, "%s %x, page_addr=%x, column=%x\n", | |
702 | __func__, command, page_addr, column); | |
703 | ||
704 | /* | |
705 | * Save the command and its arguments. This enables emulation of | |
706 | * standard flash devices, and also some optimizations. | |
707 | */ | |
708 | doc->last_command.command = command; | |
709 | doc->last_command.column = column; | |
710 | doc->last_command.page = page_addr; | |
711 | ||
712 | switch (command) { | |
713 | ||
714 | case NAND_CMD_RESET: | |
715 | reset(mtd); | |
716 | break; | |
717 | ||
718 | case NAND_CMD_READ0: | |
719 | read_page_prologue(mtd, g4_addr); | |
720 | break; | |
721 | ||
722 | case NAND_CMD_STATUS: | |
723 | /* next call to read_byte() will expect a status */ | |
724 | break; | |
725 | ||
726 | case NAND_CMD_SEQIN: | |
5a90d41b MD |
727 | if (unlikely(reliable_mode)) { |
728 | uint16_t g4_page = g4_addr >> 16; | |
729 | ||
730 | /* writes to odd-numbered 2k pages are invalid */ | |
731 | if (g4_page & 0x01) | |
732 | dev_warn(doc->dev, | |
733 | "invalid reliable mode address\n"); | |
734 | } | |
735 | ||
570469f3 MD |
736 | write_page_prologue(mtd, g4_addr); |
737 | ||
738 | /* hack for deferred write of oob bytes */ | |
739 | if (doc->oob_page == page_addr) | |
740 | memcpy(nand->oob_poi, doc->oob_buf, 16); | |
741 | break; | |
742 | ||
743 | case NAND_CMD_PAGEPROG: | |
744 | pageprog(mtd); | |
745 | break; | |
746 | ||
747 | /* we don't expect these, based on review of nand_base.c */ | |
748 | case NAND_CMD_READOOB: | |
749 | case NAND_CMD_READID: | |
750 | case NAND_CMD_ERASE1: | |
751 | case NAND_CMD_ERASE2: | |
752 | dev_warn(doc->dev, "docg4_command: " | |
753 | "unexpected nand command 0x%x\n", command); | |
754 | break; | |
755 | ||
756 | } | |
757 | } | |
758 | ||
759 | static int read_page(struct mtd_info *mtd, struct nand_chip *nand, | |
760 | uint8_t *buf, int page, bool use_ecc) | |
761 | { | |
762 | struct docg4_priv *doc = nand->priv; | |
763 | void __iomem *docptr = doc->virtadr; | |
764 | uint16_t status, edc_err, *buf16; | |
3f91e94f | 765 | int bits_corrected = 0; |
570469f3 MD |
766 | |
767 | dev_dbg(doc->dev, "%s: page %08x\n", __func__, page); | |
768 | ||
769 | writew(DOC_ECCCONF0_READ_MODE | | |
770 | DOC_ECCCONF0_ECC_ENABLE | | |
771 | DOC_ECCCONF0_UNKNOWN | | |
772 | DOCG4_BCH_SIZE, | |
773 | docptr + DOC_ECCCONF0); | |
774 | write_nop(docptr); | |
775 | write_nop(docptr); | |
776 | write_nop(docptr); | |
777 | write_nop(docptr); | |
778 | write_nop(docptr); | |
779 | ||
780 | /* the 1st byte from the I/O reg is a status; the rest is page data */ | |
781 | status = readw(docptr + DOC_IOSPACE_DATA); | |
782 | if (status & DOCG4_READ_ERROR) { | |
783 | dev_err(doc->dev, | |
784 | "docg4_read_page: bad status: 0x%02x\n", status); | |
785 | writew(0, docptr + DOC_DATAEND); | |
786 | return -EIO; | |
787 | } | |
788 | ||
789 | dev_dbg(doc->dev, "%s: status = 0x%x\n", __func__, status); | |
790 | ||
791 | docg4_read_buf(mtd, buf, DOCG4_PAGE_SIZE); /* read the page data */ | |
792 | ||
aa6d01fa | 793 | /* this device always reads oob after page data */ |
570469f3 | 794 | /* first 14 oob bytes read from I/O reg */ |
aa6d01fa | 795 | docg4_read_buf(mtd, nand->oob_poi, 14); |
570469f3 MD |
796 | |
797 | /* last 2 read from another reg */ | |
aa6d01fa | 798 | buf16 = (uint16_t *)(nand->oob_poi + 14); |
570469f3 MD |
799 | *buf16 = readw(docptr + DOCG4_MYSTERY_REG); |
800 | ||
801 | write_nop(docptr); | |
802 | ||
803 | if (likely(use_ecc == true)) { | |
804 | ||
805 | /* read the register that tells us if bitflip(s) detected */ | |
806 | edc_err = readw(docptr + DOC_ECCCONF1); | |
807 | edc_err = readw(docptr + DOC_ECCCONF1); | |
808 | dev_dbg(doc->dev, "%s: edc_err = 0x%02x\n", __func__, edc_err); | |
809 | ||
810 | /* If bitflips are reported, attempt to correct with ecc */ | |
811 | if (edc_err & DOC_ECCCONF1_BCH_SYNDROM_ERR) { | |
3f91e94f | 812 | bits_corrected = correct_data(mtd, buf, page); |
570469f3 MD |
813 | if (bits_corrected == -EBADMSG) |
814 | mtd->ecc_stats.failed++; | |
815 | else | |
816 | mtd->ecc_stats.corrected += bits_corrected; | |
817 | } | |
818 | } | |
819 | ||
820 | writew(0, docptr + DOC_DATAEND); | |
5bf3d66a MD |
821 | if (bits_corrected == -EBADMSG) /* uncorrectable errors */ |
822 | return 0; | |
3f91e94f | 823 | return bits_corrected; |
570469f3 MD |
824 | } |
825 | ||
826 | ||
827 | static int docg4_read_page_raw(struct mtd_info *mtd, struct nand_chip *nand, | |
1fbb938d | 828 | uint8_t *buf, int oob_required, int page) |
570469f3 MD |
829 | { |
830 | return read_page(mtd, nand, buf, page, false); | |
831 | } | |
832 | ||
833 | static int docg4_read_page(struct mtd_info *mtd, struct nand_chip *nand, | |
1fbb938d | 834 | uint8_t *buf, int oob_required, int page) |
570469f3 MD |
835 | { |
836 | return read_page(mtd, nand, buf, page, true); | |
837 | } | |
838 | ||
839 | static int docg4_read_oob(struct mtd_info *mtd, struct nand_chip *nand, | |
5c2ffb11 | 840 | int page) |
570469f3 MD |
841 | { |
842 | struct docg4_priv *doc = nand->priv; | |
843 | void __iomem *docptr = doc->virtadr; | |
844 | uint16_t status; | |
845 | ||
846 | dev_dbg(doc->dev, "%s: page %x\n", __func__, page); | |
847 | ||
570469f3 MD |
848 | docg4_command(mtd, NAND_CMD_READ0, nand->ecc.size, page); |
849 | ||
850 | writew(DOC_ECCCONF0_READ_MODE | DOCG4_OOB_SIZE, docptr + DOC_ECCCONF0); | |
851 | write_nop(docptr); | |
852 | write_nop(docptr); | |
853 | write_nop(docptr); | |
854 | write_nop(docptr); | |
855 | write_nop(docptr); | |
856 | ||
857 | /* the 1st byte from the I/O reg is a status; the rest is oob data */ | |
858 | status = readw(docptr + DOC_IOSPACE_DATA); | |
859 | if (status & DOCG4_READ_ERROR) { | |
860 | dev_warn(doc->dev, | |
861 | "docg4_read_oob failed: status = 0x%02x\n", status); | |
862 | return -EIO; | |
863 | } | |
864 | ||
865 | dev_dbg(doc->dev, "%s: status = 0x%x\n", __func__, status); | |
866 | ||
867 | docg4_read_buf(mtd, nand->oob_poi, 16); | |
868 | ||
869 | write_nop(docptr); | |
870 | write_nop(docptr); | |
871 | write_nop(docptr); | |
872 | writew(0, docptr + DOC_DATAEND); | |
873 | write_nop(docptr); | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
878 | static void docg4_erase_block(struct mtd_info *mtd, int page) | |
879 | { | |
880 | struct nand_chip *nand = mtd->priv; | |
881 | struct docg4_priv *doc = nand->priv; | |
882 | void __iomem *docptr = doc->virtadr; | |
883 | uint16_t g4_page; | |
884 | ||
885 | dev_dbg(doc->dev, "%s: page %04x\n", __func__, page); | |
886 | ||
887 | sequence_reset(mtd); | |
888 | ||
889 | writew(DOCG4_SEQ_BLOCKERASE, docptr + DOC_FLASHSEQUENCE); | |
890 | writew(DOC_CMD_PROG_BLOCK_ADDR, docptr + DOC_FLASHCOMMAND); | |
891 | write_nop(docptr); | |
892 | ||
893 | /* only 2 bytes of address are written to specify erase block */ | |
894 | g4_page = (uint16_t)(page / 4); /* to g4's 2k page addressing */ | |
895 | writeb(g4_page & 0xff, docptr + DOC_FLASHADDRESS); | |
896 | g4_page >>= 8; | |
897 | writeb(g4_page & 0xff, docptr + DOC_FLASHADDRESS); | |
898 | write_nop(docptr); | |
899 | ||
900 | /* start the erasure */ | |
901 | writew(DOC_CMD_ERASECYCLE2, docptr + DOC_FLASHCOMMAND); | |
902 | write_nop(docptr); | |
903 | write_nop(docptr); | |
904 | ||
905 | usleep_range(500, 1000); /* erasure is long; take a snooze */ | |
906 | poll_status(doc); | |
907 | writew(DOCG4_SEQ_FLUSH, docptr + DOC_FLASHSEQUENCE); | |
908 | writew(DOCG4_CMD_FLUSH, docptr + DOC_FLASHCOMMAND); | |
909 | writew(DOC_ECCCONF0_READ_MODE | 4, docptr + DOC_ECCCONF0); | |
910 | write_nop(docptr); | |
911 | write_nop(docptr); | |
912 | write_nop(docptr); | |
913 | write_nop(docptr); | |
914 | write_nop(docptr); | |
915 | ||
916 | read_progstatus(doc); | |
917 | ||
918 | writew(0, docptr + DOC_DATAEND); | |
919 | write_nop(docptr); | |
920 | poll_status(doc); | |
921 | write_nop(docptr); | |
922 | } | |
923 | ||
fdbad98d | 924 | static int write_page(struct mtd_info *mtd, struct nand_chip *nand, |
570469f3 MD |
925 | const uint8_t *buf, bool use_ecc) |
926 | { | |
927 | struct docg4_priv *doc = nand->priv; | |
928 | void __iomem *docptr = doc->virtadr; | |
929 | uint8_t ecc_buf[8]; | |
930 | ||
931 | dev_dbg(doc->dev, "%s...\n", __func__); | |
932 | ||
933 | writew(DOC_ECCCONF0_ECC_ENABLE | | |
934 | DOC_ECCCONF0_UNKNOWN | | |
935 | DOCG4_BCH_SIZE, | |
936 | docptr + DOC_ECCCONF0); | |
937 | write_nop(docptr); | |
938 | ||
939 | /* write the page data */ | |
940 | docg4_write_buf16(mtd, buf, DOCG4_PAGE_SIZE); | |
941 | ||
942 | /* oob bytes 0 through 5 are written to I/O reg */ | |
943 | docg4_write_buf16(mtd, nand->oob_poi, 6); | |
944 | ||
945 | /* oob byte 6 written to a separate reg */ | |
946 | writew(nand->oob_poi[6], docptr + DOCG4_OOB_6_7); | |
947 | ||
948 | write_nop(docptr); | |
949 | write_nop(docptr); | |
950 | ||
951 | /* write hw-generated ecc bytes to oob */ | |
952 | if (likely(use_ecc == true)) { | |
953 | /* oob byte 7 is hamming code */ | |
954 | uint8_t hamming = readb(docptr + DOC_HAMMINGPARITY); | |
955 | hamming = readb(docptr + DOC_HAMMINGPARITY); /* 2nd read */ | |
956 | writew(hamming, docptr + DOCG4_OOB_6_7); | |
957 | write_nop(docptr); | |
958 | ||
959 | /* read the 7 bch bytes from ecc regs */ | |
960 | read_hw_ecc(docptr, ecc_buf); | |
961 | ecc_buf[7] = 0; /* clear the "page written" flag */ | |
962 | } | |
963 | ||
964 | /* write user-supplied bytes to oob */ | |
965 | else { | |
966 | writew(nand->oob_poi[7], docptr + DOCG4_OOB_6_7); | |
967 | write_nop(docptr); | |
968 | memcpy(ecc_buf, &nand->oob_poi[8], 8); | |
969 | } | |
970 | ||
971 | docg4_write_buf16(mtd, ecc_buf, 8); | |
972 | write_nop(docptr); | |
973 | write_nop(docptr); | |
974 | writew(0, docptr + DOC_DATAEND); | |
975 | write_nop(docptr); | |
fdbad98d JW |
976 | |
977 | return 0; | |
570469f3 MD |
978 | } |
979 | ||
fdbad98d | 980 | static int docg4_write_page_raw(struct mtd_info *mtd, struct nand_chip *nand, |
1fbb938d | 981 | const uint8_t *buf, int oob_required) |
570469f3 MD |
982 | { |
983 | return write_page(mtd, nand, buf, false); | |
984 | } | |
985 | ||
fdbad98d | 986 | static int docg4_write_page(struct mtd_info *mtd, struct nand_chip *nand, |
1fbb938d | 987 | const uint8_t *buf, int oob_required) |
570469f3 MD |
988 | { |
989 | return write_page(mtd, nand, buf, true); | |
990 | } | |
991 | ||
992 | static int docg4_write_oob(struct mtd_info *mtd, struct nand_chip *nand, | |
993 | int page) | |
994 | { | |
995 | /* | |
996 | * Writing oob-only is not really supported, because MLC nand must write | |
997 | * oob bytes at the same time as page data. Nonetheless, we save the | |
998 | * oob buffer contents here, and then write it along with the page data | |
999 | * if the same page is subsequently written. This allows user space | |
1000 | * utilities that write the oob data prior to the page data to work | |
1001 | * (e.g., nandwrite). The disdvantage is that, if the intention was to | |
1002 | * write oob only, the operation is quietly ignored. Also, oob can get | |
1003 | * corrupted if two concurrent processes are running nandwrite. | |
1004 | */ | |
1005 | ||
1006 | /* note that bytes 7..14 are hw generated hamming/ecc and overwritten */ | |
1007 | struct docg4_priv *doc = nand->priv; | |
1008 | doc->oob_page = page; | |
1009 | memcpy(doc->oob_buf, nand->oob_poi, 16); | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | static int __init read_factory_bbt(struct mtd_info *mtd) | |
1014 | { | |
1015 | /* | |
1016 | * The device contains a read-only factory bad block table. Read it and | |
1017 | * update the memory-based bbt accordingly. | |
1018 | */ | |
1019 | ||
1020 | struct nand_chip *nand = mtd->priv; | |
1021 | struct docg4_priv *doc = nand->priv; | |
1022 | uint32_t g4_addr = mtd_to_docg4_address(DOCG4_FACTORY_BBT_PAGE, 0); | |
1023 | uint8_t *buf; | |
3c9c6d65 MD |
1024 | int i, block; |
1025 | __u32 eccfailed_stats = mtd->ecc_stats.failed; | |
570469f3 MD |
1026 | |
1027 | buf = kzalloc(DOCG4_PAGE_SIZE, GFP_KERNEL); | |
1028 | if (buf == NULL) | |
1029 | return -ENOMEM; | |
1030 | ||
1031 | read_page_prologue(mtd, g4_addr); | |
3c9c6d65 | 1032 | docg4_read_page(mtd, nand, buf, 0, DOCG4_FACTORY_BBT_PAGE); |
570469f3 MD |
1033 | |
1034 | /* | |
1035 | * If no memory-based bbt was created, exit. This will happen if module | |
1036 | * parameter ignore_badblocks is set. Then why even call this function? | |
1037 | * For an unknown reason, block erase always fails if it's the first | |
1038 | * operation after device power-up. The above read ensures it never is. | |
1039 | * Ugly, I know. | |
1040 | */ | |
1041 | if (nand->bbt == NULL) /* no memory-based bbt */ | |
1042 | goto exit; | |
1043 | ||
3c9c6d65 MD |
1044 | if (mtd->ecc_stats.failed > eccfailed_stats) { |
1045 | /* | |
1046 | * Whoops, an ecc failure ocurred reading the factory bbt. | |
1047 | * It is stored redundantly, so we get another chance. | |
1048 | */ | |
1049 | eccfailed_stats = mtd->ecc_stats.failed; | |
1050 | docg4_read_page(mtd, nand, buf, 0, DOCG4_REDUNDANT_BBT_PAGE); | |
1051 | if (mtd->ecc_stats.failed > eccfailed_stats) { | |
1052 | dev_warn(doc->dev, | |
1053 | "The factory bbt could not be read!\n"); | |
1054 | goto exit; | |
1055 | } | |
1056 | } | |
1057 | ||
570469f3 MD |
1058 | /* |
1059 | * Parse factory bbt and update memory-based bbt. Factory bbt format is | |
1060 | * simple: one bit per block, block numbers increase left to right (msb | |
1061 | * to lsb). Bit clear means bad block. | |
1062 | */ | |
1063 | for (i = block = 0; block < DOCG4_NUMBLOCKS; block += 8, i++) { | |
1064 | int bitnum; | |
1065 | unsigned long bits = ~buf[i]; | |
1066 | for_each_set_bit(bitnum, &bits, 8) { | |
1067 | int badblock = block + 7 - bitnum; | |
1068 | nand->bbt[badblock / 4] |= | |
1069 | 0x03 << ((badblock % 4) * 2); | |
1070 | mtd->ecc_stats.badblocks++; | |
1071 | dev_notice(doc->dev, "factory-marked bad block: %d\n", | |
1072 | badblock); | |
1073 | } | |
1074 | } | |
1075 | exit: | |
1076 | kfree(buf); | |
3c9c6d65 | 1077 | return 0; |
570469f3 MD |
1078 | } |
1079 | ||
1080 | static int docg4_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
1081 | { | |
1082 | /* | |
1083 | * Mark a block as bad. Bad blocks are marked in the oob area of the | |
1084 | * first page of the block. The default scan_bbt() in the nand | |
1085 | * infrastructure code works fine for building the memory-based bbt | |
1086 | * during initialization, as does the nand infrastructure function that | |
1087 | * checks if a block is bad by reading the bbt. This function replaces | |
1088 | * the nand default because writes to oob-only are not supported. | |
1089 | */ | |
1090 | ||
1091 | int ret, i; | |
1092 | uint8_t *buf; | |
1093 | struct nand_chip *nand = mtd->priv; | |
1094 | struct docg4_priv *doc = nand->priv; | |
1095 | struct nand_bbt_descr *bbtd = nand->badblock_pattern; | |
570469f3 MD |
1096 | int page = (int)(ofs >> nand->page_shift); |
1097 | uint32_t g4_addr = mtd_to_docg4_address(page, 0); | |
1098 | ||
1099 | dev_dbg(doc->dev, "%s: %08llx\n", __func__, ofs); | |
1100 | ||
1101 | if (unlikely(ofs & (DOCG4_BLOCK_SIZE - 1))) | |
1102 | dev_warn(doc->dev, "%s: ofs %llx not start of block!\n", | |
1103 | __func__, ofs); | |
1104 | ||
1105 | /* allocate blank buffer for page data */ | |
1106 | buf = kzalloc(DOCG4_PAGE_SIZE, GFP_KERNEL); | |
1107 | if (buf == NULL) | |
1108 | return -ENOMEM; | |
1109 | ||
570469f3 MD |
1110 | /* write bit-wise negation of pattern to oob buffer */ |
1111 | memset(nand->oob_poi, 0xff, mtd->oobsize); | |
1112 | for (i = 0; i < bbtd->len; i++) | |
1113 | nand->oob_poi[bbtd->offs + i] = ~bbtd->pattern[i]; | |
1114 | ||
1115 | /* write first page of block */ | |
1116 | write_page_prologue(mtd, g4_addr); | |
1fbb938d | 1117 | docg4_write_page(mtd, nand, buf, 1); |
570469f3 | 1118 | ret = pageprog(mtd); |
570469f3 MD |
1119 | |
1120 | kfree(buf); | |
1121 | ||
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | static int docg4_block_neverbad(struct mtd_info *mtd, loff_t ofs, int getchip) | |
1126 | { | |
1127 | /* only called when module_param ignore_badblocks is set */ | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | static int docg4_suspend(struct platform_device *pdev, pm_message_t state) | |
1132 | { | |
1133 | /* | |
1134 | * Put the device into "deep power-down" mode. Note that CE# must be | |
1135 | * deasserted for this to take effect. The xscale, e.g., can be | |
1136 | * configured to float this signal when the processor enters power-down, | |
1137 | * and a suitable pull-up ensures its deassertion. | |
1138 | */ | |
1139 | ||
1140 | int i; | |
1141 | uint8_t pwr_down; | |
1142 | struct docg4_priv *doc = platform_get_drvdata(pdev); | |
1143 | void __iomem *docptr = doc->virtadr; | |
1144 | ||
1145 | dev_dbg(doc->dev, "%s...\n", __func__); | |
1146 | ||
1147 | /* poll the register that tells us we're ready to go to sleep */ | |
1148 | for (i = 0; i < 10; i++) { | |
1149 | pwr_down = readb(docptr + DOC_POWERMODE); | |
1150 | if (pwr_down & DOC_POWERDOWN_READY) | |
1151 | break; | |
1152 | usleep_range(1000, 4000); | |
1153 | } | |
1154 | ||
1155 | if (pwr_down & DOC_POWERDOWN_READY) { | |
1156 | dev_err(doc->dev, "suspend failed; " | |
1157 | "timeout polling DOC_POWERDOWN_READY\n"); | |
1158 | return -EIO; | |
1159 | } | |
1160 | ||
1161 | writew(DOC_ASICMODE_POWERDOWN | DOC_ASICMODE_MDWREN, | |
1162 | docptr + DOC_ASICMODE); | |
1163 | writew(~(DOC_ASICMODE_POWERDOWN | DOC_ASICMODE_MDWREN), | |
1164 | docptr + DOC_ASICMODECONFIRM); | |
1165 | ||
1166 | write_nop(docptr); | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | static int docg4_resume(struct platform_device *pdev) | |
1172 | { | |
1173 | ||
1174 | /* | |
1175 | * Exit power-down. Twelve consecutive reads of the address below | |
1176 | * accomplishes this, assuming CE# has been asserted. | |
1177 | */ | |
1178 | ||
1179 | struct docg4_priv *doc = platform_get_drvdata(pdev); | |
1180 | void __iomem *docptr = doc->virtadr; | |
1181 | int i; | |
1182 | ||
1183 | dev_dbg(doc->dev, "%s...\n", __func__); | |
1184 | ||
1185 | for (i = 0; i < 12; i++) | |
1186 | readb(docptr + 0x1fff); | |
1187 | ||
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | static void __init init_mtd_structs(struct mtd_info *mtd) | |
1192 | { | |
1193 | /* initialize mtd and nand data structures */ | |
1194 | ||
1195 | /* | |
1196 | * Note that some of the following initializations are not usually | |
1197 | * required within a nand driver because they are performed by the nand | |
1198 | * infrastructure code as part of nand_scan(). In this case they need | |
1199 | * to be initialized here because we skip call to nand_scan_ident() (the | |
1200 | * first half of nand_scan()). The call to nand_scan_ident() is skipped | |
1201 | * because for this device the chip id is not read in the manner of a | |
1202 | * standard nand device. Unfortunately, nand_scan_ident() does other | |
1203 | * things as well, such as call nand_set_defaults(). | |
1204 | */ | |
1205 | ||
1206 | struct nand_chip *nand = mtd->priv; | |
1207 | struct docg4_priv *doc = nand->priv; | |
1208 | ||
1209 | mtd->size = DOCG4_CHIP_SIZE; | |
1210 | mtd->name = "Msys_Diskonchip_G4"; | |
1211 | mtd->writesize = DOCG4_PAGE_SIZE; | |
1212 | mtd->erasesize = DOCG4_BLOCK_SIZE; | |
1213 | mtd->oobsize = DOCG4_OOB_SIZE; | |
1214 | nand->chipsize = DOCG4_CHIP_SIZE; | |
1215 | nand->chip_shift = DOCG4_CHIP_SHIFT; | |
1216 | nand->bbt_erase_shift = nand->phys_erase_shift = DOCG4_ERASE_SHIFT; | |
1217 | nand->chip_delay = 20; | |
1218 | nand->page_shift = DOCG4_PAGE_SHIFT; | |
1219 | nand->pagemask = 0x3ffff; | |
1220 | nand->badblockpos = NAND_LARGE_BADBLOCK_POS; | |
1221 | nand->badblockbits = 8; | |
1222 | nand->ecc.layout = &docg4_oobinfo; | |
1223 | nand->ecc.mode = NAND_ECC_HW_SYNDROME; | |
1224 | nand->ecc.size = DOCG4_PAGE_SIZE; | |
1225 | nand->ecc.prepad = 8; | |
1226 | nand->ecc.bytes = 8; | |
6a918bad | 1227 | nand->ecc.strength = DOCG4_T; |
1826dbcc | 1228 | nand->options = NAND_BUSWIDTH_16 | NAND_NO_SUBPAGE_WRITE; |
570469f3 MD |
1229 | nand->IO_ADDR_R = nand->IO_ADDR_W = doc->virtadr + DOC_IOSPACE_DATA; |
1230 | nand->controller = &nand->hwcontrol; | |
1231 | spin_lock_init(&nand->controller->lock); | |
1232 | init_waitqueue_head(&nand->controller->wq); | |
1233 | ||
1234 | /* methods */ | |
1235 | nand->cmdfunc = docg4_command; | |
1236 | nand->waitfunc = docg4_wait; | |
1237 | nand->select_chip = docg4_select_chip; | |
1238 | nand->read_byte = docg4_read_byte; | |
1239 | nand->block_markbad = docg4_block_markbad; | |
1240 | nand->read_buf = docg4_read_buf; | |
1241 | nand->write_buf = docg4_write_buf16; | |
1242 | nand->scan_bbt = nand_default_bbt; | |
1243 | nand->erase_cmd = docg4_erase_block; | |
1244 | nand->ecc.read_page = docg4_read_page; | |
1245 | nand->ecc.write_page = docg4_write_page; | |
1246 | nand->ecc.read_page_raw = docg4_read_page_raw; | |
1247 | nand->ecc.write_page_raw = docg4_write_page_raw; | |
1248 | nand->ecc.read_oob = docg4_read_oob; | |
1249 | nand->ecc.write_oob = docg4_write_oob; | |
1250 | ||
1251 | /* | |
1252 | * The way the nand infrastructure code is written, a memory-based bbt | |
1253 | * is not created if NAND_SKIP_BBTSCAN is set. With no memory bbt, | |
1254 | * nand->block_bad() is used. So when ignoring bad blocks, we skip the | |
1255 | * scan and define a dummy block_bad() which always returns 0. | |
1256 | */ | |
1257 | if (ignore_badblocks) { | |
1258 | nand->options |= NAND_SKIP_BBTSCAN; | |
1259 | nand->block_bad = docg4_block_neverbad; | |
1260 | } | |
1261 | ||
1262 | } | |
1263 | ||
1264 | static int __init read_id_reg(struct mtd_info *mtd) | |
1265 | { | |
1266 | struct nand_chip *nand = mtd->priv; | |
1267 | struct docg4_priv *doc = nand->priv; | |
1268 | void __iomem *docptr = doc->virtadr; | |
1269 | uint16_t id1, id2; | |
1270 | ||
1271 | /* check for presence of g4 chip by reading id registers */ | |
1272 | id1 = readw(docptr + DOC_CHIPID); | |
1273 | id1 = readw(docptr + DOCG4_MYSTERY_REG); | |
1274 | id2 = readw(docptr + DOC_CHIPID_INV); | |
1275 | id2 = readw(docptr + DOCG4_MYSTERY_REG); | |
1276 | ||
1277 | if (id1 == DOCG4_IDREG1_VALUE && id2 == DOCG4_IDREG2_VALUE) { | |
1278 | dev_info(doc->dev, | |
1279 | "NAND device: 128MiB Diskonchip G4 detected\n"); | |
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | return -ENODEV; | |
1284 | } | |
1285 | ||
1286 | static char const *part_probes[] = { "cmdlinepart", "saftlpart", NULL }; | |
1287 | ||
1288 | static int __init probe_docg4(struct platform_device *pdev) | |
1289 | { | |
1290 | struct mtd_info *mtd; | |
1291 | struct nand_chip *nand; | |
1292 | void __iomem *virtadr; | |
1293 | struct docg4_priv *doc; | |
1294 | int len, retval; | |
1295 | struct resource *r; | |
1296 | struct device *dev = &pdev->dev; | |
1297 | ||
1298 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1299 | if (r == NULL) { | |
1300 | dev_err(dev, "no io memory resource defined!\n"); | |
1301 | return -ENODEV; | |
1302 | } | |
1303 | ||
1304 | virtadr = ioremap(r->start, resource_size(r)); | |
1305 | if (!virtadr) { | |
2c4ae276 | 1306 | dev_err(dev, "Diskonchip ioremap failed: %pR\n", r); |
570469f3 MD |
1307 | return -EIO; |
1308 | } | |
1309 | ||
1310 | len = sizeof(struct mtd_info) + sizeof(struct nand_chip) + | |
1311 | sizeof(struct docg4_priv); | |
1312 | mtd = kzalloc(len, GFP_KERNEL); | |
1313 | if (mtd == NULL) { | |
1314 | retval = -ENOMEM; | |
1315 | goto fail; | |
1316 | } | |
1317 | nand = (struct nand_chip *) (mtd + 1); | |
1318 | doc = (struct docg4_priv *) (nand + 1); | |
1319 | mtd->priv = nand; | |
1320 | nand->priv = doc; | |
1321 | mtd->owner = THIS_MODULE; | |
1322 | doc->virtadr = virtadr; | |
1323 | doc->dev = dev; | |
1324 | ||
1325 | init_mtd_structs(mtd); | |
1326 | ||
1327 | /* initialize kernel bch algorithm */ | |
1328 | doc->bch = init_bch(DOCG4_M, DOCG4_T, DOCG4_PRIMITIVE_POLY); | |
1329 | if (doc->bch == NULL) { | |
1330 | retval = -EINVAL; | |
1331 | goto fail; | |
1332 | } | |
1333 | ||
1334 | platform_set_drvdata(pdev, doc); | |
1335 | ||
1336 | reset(mtd); | |
1337 | retval = read_id_reg(mtd); | |
1338 | if (retval == -ENODEV) { | |
1339 | dev_warn(dev, "No diskonchip G4 device found.\n"); | |
1340 | goto fail; | |
1341 | } | |
1342 | ||
1343 | retval = nand_scan_tail(mtd); | |
1344 | if (retval) | |
1345 | goto fail; | |
1346 | ||
1347 | retval = read_factory_bbt(mtd); | |
1348 | if (retval) | |
1349 | goto fail; | |
1350 | ||
1351 | retval = mtd_device_parse_register(mtd, part_probes, NULL, NULL, 0); | |
1352 | if (retval) | |
1353 | goto fail; | |
1354 | ||
1355 | doc->mtd = mtd; | |
1356 | return 0; | |
1357 | ||
1358 | fail: | |
1359 | iounmap(virtadr); | |
1360 | if (mtd) { | |
1361 | /* re-declarations avoid compiler warning */ | |
1362 | struct nand_chip *nand = mtd->priv; | |
1363 | struct docg4_priv *doc = nand->priv; | |
1364 | nand_release(mtd); /* deletes partitions and mtd devices */ | |
570469f3 MD |
1365 | free_bch(doc->bch); |
1366 | kfree(mtd); | |
1367 | } | |
1368 | ||
1369 | return retval; | |
1370 | } | |
1371 | ||
1372 | static int __exit cleanup_docg4(struct platform_device *pdev) | |
1373 | { | |
1374 | struct docg4_priv *doc = platform_get_drvdata(pdev); | |
1375 | nand_release(doc->mtd); | |
570469f3 MD |
1376 | free_bch(doc->bch); |
1377 | kfree(doc->mtd); | |
1378 | iounmap(doc->virtadr); | |
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | static struct platform_driver docg4_driver = { | |
1383 | .driver = { | |
1384 | .name = "docg4", | |
1385 | .owner = THIS_MODULE, | |
1386 | }, | |
1387 | .suspend = docg4_suspend, | |
1388 | .resume = docg4_resume, | |
1389 | .remove = __exit_p(cleanup_docg4), | |
1390 | }; | |
1391 | ||
725a2277 | 1392 | module_platform_driver_probe(docg4_driver, probe_docg4); |
570469f3 MD |
1393 | |
1394 | MODULE_LICENSE("GPL"); | |
1395 | MODULE_AUTHOR("Mike Dunn"); | |
1396 | MODULE_DESCRIPTION("M-Systems DiskOnChip G4 device driver"); |