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sfc: Don't use enums as a bitmask.
[zen-stable.git] / drivers / mtd / nand / diskonchip.c
blob96c0b34ba8dbcfb18b564cabf3c22f3bc74f5a19
1 /*
2 * drivers/mtd/nand/diskonchip.c
3 *
4 * (C) 2003 Red Hat, Inc.
5 * (C) 2004 Dan Brown <dan_brown@ieee.org>
6 * (C) 2004 Kalev Lember <kalev@smartlink.ee>
7 *
8 * Author: David Woodhouse <dwmw2@infradead.org>
9 * Additional Diskonchip 2000 and Millennium support by Dan Brown <dan_brown@ieee.org>
10 * Diskonchip Millennium Plus support by Kalev Lember <kalev@smartlink.ee>
11 *
12 * Error correction code lifted from the old docecc code
13 * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
14 * Copyright (C) 2000 Netgem S.A.
15 * converted to the generic Reed-Solomon library by Thomas Gleixner <tglx@linutronix.de>
16 *
17 * Interface to generic NAND code for M-Systems DiskOnChip devices
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/sched.h>
23 #include <linux/delay.h>
24 #include <linux/rslib.h>
25 #include <linux/moduleparam.h>
26 #include <linux/slab.h>
27 #include <asm/io.h>
28
29 #include <linux/mtd/mtd.h>
30 #include <linux/mtd/nand.h>
31 #include <linux/mtd/doc2000.h>
32 #include <linux/mtd/partitions.h>
33 #include <linux/mtd/inftl.h>
34
35 /* Where to look for the devices? */
36 #ifndef CONFIG_MTD_NAND_DISKONCHIP_PROBE_ADDRESS
37 #define CONFIG_MTD_NAND_DISKONCHIP_PROBE_ADDRESS 0
38 #endif
39
40 static unsigned long __initdata doc_locations[] = {
41 #if defined (__alpha__) || defined(__i386__) || defined(__x86_64__)
42 #ifdef CONFIG_MTD_NAND_DISKONCHIP_PROBE_HIGH
43 0xfffc8000, 0xfffca000, 0xfffcc000, 0xfffce000,
44 0xfffd0000, 0xfffd2000, 0xfffd4000, 0xfffd6000,
45 0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000,
46 0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000,
47 0xfffe8000, 0xfffea000, 0xfffec000, 0xfffee000,
48 #else /* CONFIG_MTD_DOCPROBE_HIGH */
49 0xc8000, 0xca000, 0xcc000, 0xce000,
50 0xd0000, 0xd2000, 0xd4000, 0xd6000,
51 0xd8000, 0xda000, 0xdc000, 0xde000,
52 0xe0000, 0xe2000, 0xe4000, 0xe6000,
53 0xe8000, 0xea000, 0xec000, 0xee000,
54 #endif /* CONFIG_MTD_DOCPROBE_HIGH */
55 #else
56 #warning Unknown architecture for DiskOnChip. No default probe locations defined
57 #endif
58 0xffffffff };
59
60 static struct mtd_info *doclist = NULL;
61
62 struct doc_priv {
63 void __iomem *virtadr;
64 unsigned long physadr;
65 u_char ChipID;
66 u_char CDSNControl;
67 int chips_per_floor; /* The number of chips detected on each floor */
68 int curfloor;
69 int curchip;
70 int mh0_page;
71 int mh1_page;
72 struct mtd_info *nextdoc;
73 };
74
75 /* This is the syndrome computed by the HW ecc generator upon reading an empty
76 page, one with all 0xff for data and stored ecc code. */
77 static u_char empty_read_syndrome[6] = { 0x26, 0xff, 0x6d, 0x47, 0x73, 0x7a };
78
79 /* This is the ecc value computed by the HW ecc generator upon writing an empty
80 page, one with all 0xff for data. */
81 static u_char empty_write_ecc[6] = { 0x4b, 0x00, 0xe2, 0x0e, 0x93, 0xf7 };
82
83 #define INFTL_BBT_RESERVED_BLOCKS 4
84
85 #define DoC_is_MillenniumPlus(doc) ((doc)->ChipID == DOC_ChipID_DocMilPlus16 || (doc)->ChipID == DOC_ChipID_DocMilPlus32)
86 #define DoC_is_Millennium(doc) ((doc)->ChipID == DOC_ChipID_DocMil)
87 #define DoC_is_2000(doc) ((doc)->ChipID == DOC_ChipID_Doc2k)
88
89 static void doc200x_hwcontrol(struct mtd_info *mtd, int cmd,
90 unsigned int bitmask);
91 static void doc200x_select_chip(struct mtd_info *mtd, int chip);
92
93 static int debug = 0;
94 module_param(debug, int, 0);
95
96 static int try_dword = 1;
97 module_param(try_dword, int, 0);
98
99 static int no_ecc_failures = 0;
100 module_param(no_ecc_failures, int, 0);
101
102 static int no_autopart = 0;
103 module_param(no_autopart, int, 0);
104
105 static int show_firmware_partition = 0;
106 module_param(show_firmware_partition, int, 0);
107
108 #ifdef CONFIG_MTD_NAND_DISKONCHIP_BBTWRITE
109 static int inftl_bbt_write = 1;
110 #else
111 static int inftl_bbt_write = 0;
112 #endif
113 module_param(inftl_bbt_write, int, 0);
114
115 static unsigned long doc_config_location = CONFIG_MTD_NAND_DISKONCHIP_PROBE_ADDRESS;
116 module_param(doc_config_location, ulong, 0);
117 MODULE_PARM_DESC(doc_config_location, "Physical memory address at which to probe for DiskOnChip");
118
119 /* Sector size for HW ECC */
120 #define SECTOR_SIZE 512
121 /* The sector bytes are packed into NB_DATA 10 bit words */
122 #define NB_DATA (((SECTOR_SIZE + 1) * 8 + 6) / 10)
123 /* Number of roots */
124 #define NROOTS 4
125 /* First consective root */
126 #define FCR 510
127 /* Number of symbols */
128 #define NN 1023
129
130 /* the Reed Solomon control structure */
131 static struct rs_control *rs_decoder;
132
133 /*
134 * The HW decoder in the DoC ASIC's provides us a error syndrome,
135 * which we must convert to a standard syndrom usable by the generic
136 * Reed-Solomon library code.
137 *
138 * Fabrice Bellard figured this out in the old docecc code. I added
139 * some comments, improved a minor bit and converted it to make use
140 * of the generic Reed-Solomon library. tglx
141 */
142 static int doc_ecc_decode(struct rs_control *rs, uint8_t *data, uint8_t *ecc)
143 {
144 int i, j, nerr, errpos[8];
145 uint8_t parity;
146 uint16_t ds[4], s[5], tmp, errval[8], syn[4];
147
148 memset(syn, 0, sizeof(syn));
149 /* Convert the ecc bytes into words */
150 ds[0] = ((ecc[4] & 0xff) >> 0) | ((ecc[5] & 0x03) << 8);
151 ds[1] = ((ecc[5] & 0xfc) >> 2) | ((ecc[2] & 0x0f) << 6);
152 ds[2] = ((ecc[2] & 0xf0) >> 4) | ((ecc[3] & 0x3f) << 4);
153 ds[3] = ((ecc[3] & 0xc0) >> 6) | ((ecc[0] & 0xff) << 2);
154 parity = ecc[1];
155
156 /* Initialize the syndrom buffer */
157 for (i = 0; i < NROOTS; i++)
158 s[i] = ds[0];
159 /*
160 * Evaluate
161 * s[i] = ds[3]x^3 + ds[2]x^2 + ds[1]x^1 + ds[0]
162 * where x = alpha^(FCR + i)
163 */
164 for (j = 1; j < NROOTS; j++) {
165 if (ds[j] == 0)
166 continue;
167 tmp = rs->index_of[ds[j]];
168 for (i = 0; i < NROOTS; i++)
169 s[i] ^= rs->alpha_to[rs_modnn(rs, tmp + (FCR + i) * j)];
170 }
171
172 /* Calc syn[i] = s[i] / alpha^(v + i) */
173 for (i = 0; i < NROOTS; i++) {
174 if (s[i])
175 syn[i] = rs_modnn(rs, rs->index_of[s[i]] + (NN - FCR - i));
176 }
177 /* Call the decoder library */
178 nerr = decode_rs16(rs, NULL, NULL, 1019, syn, 0, errpos, 0, errval);
179
180 /* Incorrectable errors ? */
181 if (nerr < 0)
182 return nerr;
183
184 /*
185 * Correct the errors. The bitpositions are a bit of magic,
186 * but they are given by the design of the de/encoder circuit
187 * in the DoC ASIC's.
188 */
189 for (i = 0; i < nerr; i++) {
190 int index, bitpos, pos = 1015 - errpos[i];
191 uint8_t val;
192 if (pos >= NB_DATA && pos < 1019)
193 continue;
194 if (pos < NB_DATA) {
195 /* extract bit position (MSB first) */
196 pos = 10 * (NB_DATA - 1 - pos) - 6;
197 /* now correct the following 10 bits. At most two bytes
198 can be modified since pos is even */
199 index = (pos >> 3) ^ 1;
200 bitpos = pos & 7;
201 if ((index >= 0 && index < SECTOR_SIZE) || index == (SECTOR_SIZE + 1)) {
202 val = (uint8_t) (errval[i] >> (2 + bitpos));
203 parity ^= val;
204 if (index < SECTOR_SIZE)
205 data[index] ^= val;
206 }
207 index = ((pos >> 3) + 1) ^ 1;
208 bitpos = (bitpos + 10) & 7;
209 if (bitpos == 0)
210 bitpos = 8;
211 if ((index >= 0 && index < SECTOR_SIZE) || index == (SECTOR_SIZE + 1)) {
212 val = (uint8_t) (errval[i] << (8 - bitpos));
213 parity ^= val;
214 if (index < SECTOR_SIZE)
215 data[index] ^= val;
216 }
217 }
218 }
219 /* If the parity is wrong, no rescue possible */
220 return parity ? -EBADMSG : nerr;
221 }
222
223 static void DoC_Delay(struct doc_priv *doc, unsigned short cycles)
224 {
225 volatile char dummy;
226 int i;
227
228 for (i = 0; i < cycles; i++) {
229 if (DoC_is_Millennium(doc))
230 dummy = ReadDOC(doc->virtadr, NOP);
231 else if (DoC_is_MillenniumPlus(doc))
232 dummy = ReadDOC(doc->virtadr, Mplus_NOP);
233 else
234 dummy = ReadDOC(doc->virtadr, DOCStatus);
235 }
236
237 }
238
239 #define CDSN_CTRL_FR_B_MASK (CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1)
240
241 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
242 static int _DoC_WaitReady(struct doc_priv *doc)
243 {
244 void __iomem *docptr = doc->virtadr;
245 unsigned long timeo = jiffies + (HZ * 10);
246
247 if (debug)
248 printk("_DoC_WaitReady...\n");
249 /* Out-of-line routine to wait for chip response */
250 if (DoC_is_MillenniumPlus(doc)) {
251 while ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) {
252 if (time_after(jiffies, timeo)) {
253 printk("_DoC_WaitReady timed out.\n");
254 return -EIO;
255 }
256 udelay(1);
257 cond_resched();
258 }
259 } else {
260 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
261 if (time_after(jiffies, timeo)) {
262 printk("_DoC_WaitReady timed out.\n");
263 return -EIO;
264 }
265 udelay(1);
266 cond_resched();
267 }
268 }
269
270 return 0;
271 }
272
273 static inline int DoC_WaitReady(struct doc_priv *doc)
274 {
275 void __iomem *docptr = doc->virtadr;
276 int ret = 0;
277
278 if (DoC_is_MillenniumPlus(doc)) {
279 DoC_Delay(doc, 4);
280
281 if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK)
282 /* Call the out-of-line routine to wait */
283 ret = _DoC_WaitReady(doc);
284 } else {
285 DoC_Delay(doc, 4);
286
287 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
288 /* Call the out-of-line routine to wait */
289 ret = _DoC_WaitReady(doc);
290 DoC_Delay(doc, 2);
291 }
292
293 if (debug)
294 printk("DoC_WaitReady OK\n");
295 return ret;
296 }
297
298 static void doc2000_write_byte(struct mtd_info *mtd, u_char datum)
299 {
300 struct nand_chip *this = mtd->priv;
301 struct doc_priv *doc = this->priv;
302 void __iomem *docptr = doc->virtadr;
303
304 if (debug)
305 printk("write_byte %02x\n", datum);
306 WriteDOC(datum, docptr, CDSNSlowIO);
307 WriteDOC(datum, docptr, 2k_CDSN_IO);
308 }
309
310 static u_char doc2000_read_byte(struct mtd_info *mtd)
311 {
312 struct nand_chip *this = mtd->priv;
313 struct doc_priv *doc = this->priv;
314 void __iomem *docptr = doc->virtadr;
315 u_char ret;
316
317 ReadDOC(docptr, CDSNSlowIO);
318 DoC_Delay(doc, 2);
319 ret = ReadDOC(docptr, 2k_CDSN_IO);
320 if (debug)
321 printk("read_byte returns %02x\n", ret);
322 return ret;
323 }
324
325 static void doc2000_writebuf(struct mtd_info *mtd, const u_char *buf, int len)
326 {
327 struct nand_chip *this = mtd->priv;
328 struct doc_priv *doc = this->priv;
329 void __iomem *docptr = doc->virtadr;
330 int i;
331 if (debug)
332 printk("writebuf of %d bytes: ", len);
333 for (i = 0; i < len; i++) {
334 WriteDOC_(buf[i], docptr, DoC_2k_CDSN_IO + i);
335 if (debug && i < 16)
336 printk("%02x ", buf[i]);
337 }
338 if (debug)
339 printk("\n");
340 }
341
342 static void doc2000_readbuf(struct mtd_info *mtd, u_char *buf, int len)
343 {
344 struct nand_chip *this = mtd->priv;
345 struct doc_priv *doc = this->priv;
346 void __iomem *docptr = doc->virtadr;
347 int i;
348
349 if (debug)
350 printk("readbuf of %d bytes: ", len);
351
352 for (i = 0; i < len; i++) {
353 buf[i] = ReadDOC(docptr, 2k_CDSN_IO + i);
354 }
355 }
356
357 static void doc2000_readbuf_dword(struct mtd_info *mtd, u_char *buf, int len)
358 {
359 struct nand_chip *this = mtd->priv;
360 struct doc_priv *doc = this->priv;
361 void __iomem *docptr = doc->virtadr;
362 int i;
363
364 if (debug)
365 printk("readbuf_dword of %d bytes: ", len);
366
367 if (unlikely((((unsigned long)buf) | len) & 3)) {
368 for (i = 0; i < len; i++) {
369 *(uint8_t *) (&buf[i]) = ReadDOC(docptr, 2k_CDSN_IO + i);
370 }
371 } else {
372 for (i = 0; i < len; i += 4) {
373 *(uint32_t *) (&buf[i]) = readl(docptr + DoC_2k_CDSN_IO + i);
374 }
375 }
376 }
377
378 static int doc2000_verifybuf(struct mtd_info *mtd, const u_char *buf, int len)
379 {
380 struct nand_chip *this = mtd->priv;
381 struct doc_priv *doc = this->priv;
382 void __iomem *docptr = doc->virtadr;
383 int i;
384
385 for (i = 0; i < len; i++)
386 if (buf[i] != ReadDOC(docptr, 2k_CDSN_IO))
387 return -EFAULT;
388 return 0;
389 }
390
391 static uint16_t __init doc200x_ident_chip(struct mtd_info *mtd, int nr)
392 {
393 struct nand_chip *this = mtd->priv;
394 struct doc_priv *doc = this->priv;
395 uint16_t ret;
396
397 doc200x_select_chip(mtd, nr);
398 doc200x_hwcontrol(mtd, NAND_CMD_READID,
399 NAND_CTRL_CLE | NAND_CTRL_CHANGE);
400 doc200x_hwcontrol(mtd, 0, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
401 doc200x_hwcontrol(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
402
403 /* We can't' use dev_ready here, but at least we wait for the
404 * command to complete
405 */
406 udelay(50);
407
408 ret = this->read_byte(mtd) << 8;
409 ret |= this->read_byte(mtd);
410
411 if (doc->ChipID == DOC_ChipID_Doc2k && try_dword && !nr) {
412 /* First chip probe. See if we get same results by 32-bit access */
413 union {
414 uint32_t dword;
415 uint8_t byte[4];
416 } ident;
417 void __iomem *docptr = doc->virtadr;
418
419 doc200x_hwcontrol(mtd, NAND_CMD_READID,
420 NAND_CTRL_CLE | NAND_CTRL_CHANGE);
421 doc200x_hwcontrol(mtd, 0, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
422 doc200x_hwcontrol(mtd, NAND_CMD_NONE,
423 NAND_NCE | NAND_CTRL_CHANGE);
424
425 udelay(50);
426
427 ident.dword = readl(docptr + DoC_2k_CDSN_IO);
428 if (((ident.byte[0] << 8) | ident.byte[1]) == ret) {
429 printk(KERN_INFO "DiskOnChip 2000 responds to DWORD access\n");
430 this->read_buf = &doc2000_readbuf_dword;
431 }
432 }
433
434 return ret;
435 }
436
437 static void __init doc2000_count_chips(struct mtd_info *mtd)
438 {
439 struct nand_chip *this = mtd->priv;
440 struct doc_priv *doc = this->priv;
441 uint16_t mfrid;
442 int i;
443
444 /* Max 4 chips per floor on DiskOnChip 2000 */
445 doc->chips_per_floor = 4;
446
447 /* Find out what the first chip is */
448 mfrid = doc200x_ident_chip(mtd, 0);
449
450 /* Find how many chips in each floor. */
451 for (i = 1; i < 4; i++) {
452 if (doc200x_ident_chip(mtd, i) != mfrid)
453 break;
454 }
455 doc->chips_per_floor = i;
456 printk(KERN_DEBUG "Detected %d chips per floor.\n", i);
457 }
458
459 static int doc200x_wait(struct mtd_info *mtd, struct nand_chip *this)
460 {
461 struct doc_priv *doc = this->priv;
462
463 int status;
464
465 DoC_WaitReady(doc);
466 this->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
467 DoC_WaitReady(doc);
468 status = (int)this->read_byte(mtd);
469
470 return status;
471 }
472
473 static void doc2001_write_byte(struct mtd_info *mtd, u_char datum)
474 {
475 struct nand_chip *this = mtd->priv;
476 struct doc_priv *doc = this->priv;
477 void __iomem *docptr = doc->virtadr;
478
479 WriteDOC(datum, docptr, CDSNSlowIO);
480 WriteDOC(datum, docptr, Mil_CDSN_IO);
481 WriteDOC(datum, docptr, WritePipeTerm);
482 }
483
484 static u_char doc2001_read_byte(struct mtd_info *mtd)
485 {
486 struct nand_chip *this = mtd->priv;
487 struct doc_priv *doc = this->priv;
488 void __iomem *docptr = doc->virtadr;
489
490 //ReadDOC(docptr, CDSNSlowIO);
491 /* 11.4.5 -- delay twice to allow extended length cycle */
492 DoC_Delay(doc, 2);
493 ReadDOC(docptr, ReadPipeInit);
494 //return ReadDOC(docptr, Mil_CDSN_IO);
495 return ReadDOC(docptr, LastDataRead);
496 }
497
498 static void doc2001_writebuf(struct mtd_info *mtd, const u_char *buf, int len)
499 {
500 struct nand_chip *this = mtd->priv;
501 struct doc_priv *doc = this->priv;
502 void __iomem *docptr = doc->virtadr;
503 int i;
504
505 for (i = 0; i < len; i++)
506 WriteDOC_(buf[i], docptr, DoC_Mil_CDSN_IO + i);
507 /* Terminate write pipeline */
508 WriteDOC(0x00, docptr, WritePipeTerm);
509 }
510
511 static void doc2001_readbuf(struct mtd_info *mtd, u_char *buf, int len)
512 {
513 struct nand_chip *this = mtd->priv;
514 struct doc_priv *doc = this->priv;
515 void __iomem *docptr = doc->virtadr;
516 int i;
517
518 /* Start read pipeline */
519 ReadDOC(docptr, ReadPipeInit);
520
521 for (i = 0; i < len - 1; i++)
522 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff));
523
524 /* Terminate read pipeline */
525 buf[i] = ReadDOC(docptr, LastDataRead);
526 }
527
528 static int doc2001_verifybuf(struct mtd_info *mtd, const u_char *buf, int len)
529 {
530 struct nand_chip *this = mtd->priv;
531 struct doc_priv *doc = this->priv;
532 void __iomem *docptr = doc->virtadr;
533 int i;
534
535 /* Start read pipeline */
536 ReadDOC(docptr, ReadPipeInit);
537
538 for (i = 0; i < len - 1; i++)
539 if (buf[i] != ReadDOC(docptr, Mil_CDSN_IO)) {
540 ReadDOC(docptr, LastDataRead);
541 return i;
542 }
543 if (buf[i] != ReadDOC(docptr, LastDataRead))
544 return i;
545 return 0;
546 }
547
548 static u_char doc2001plus_read_byte(struct mtd_info *mtd)
549 {
550 struct nand_chip *this = mtd->priv;
551 struct doc_priv *doc = this->priv;
552 void __iomem *docptr = doc->virtadr;
553 u_char ret;
554
555 ReadDOC(docptr, Mplus_ReadPipeInit);
556 ReadDOC(docptr, Mplus_ReadPipeInit);
557 ret = ReadDOC(docptr, Mplus_LastDataRead);
558 if (debug)
559 printk("read_byte returns %02x\n", ret);
560 return ret;
561 }
562
563 static void doc2001plus_writebuf(struct mtd_info *mtd, const u_char *buf, int len)
564 {
565 struct nand_chip *this = mtd->priv;
566 struct doc_priv *doc = this->priv;
567 void __iomem *docptr = doc->virtadr;
568 int i;
569
570 if (debug)
571 printk("writebuf of %d bytes: ", len);
572 for (i = 0; i < len; i++) {
573 WriteDOC_(buf[i], docptr, DoC_Mil_CDSN_IO + i);
574 if (debug && i < 16)
575 printk("%02x ", buf[i]);
576 }
577 if (debug)
578 printk("\n");
579 }
580
581 static void doc2001plus_readbuf(struct mtd_info *mtd, u_char *buf, int len)
582 {
583 struct nand_chip *this = mtd->priv;
584 struct doc_priv *doc = this->priv;
585 void __iomem *docptr = doc->virtadr;
586 int i;
587
588 if (debug)
589 printk("readbuf of %d bytes: ", len);
590
591 /* Start read pipeline */
592 ReadDOC(docptr, Mplus_ReadPipeInit);
593 ReadDOC(docptr, Mplus_ReadPipeInit);
594
595 for (i = 0; i < len - 2; i++) {
596 buf[i] = ReadDOC(docptr, Mil_CDSN_IO);
597 if (debug && i < 16)
598 printk("%02x ", buf[i]);
599 }
600
601 /* Terminate read pipeline */
602 buf[len - 2] = ReadDOC(docptr, Mplus_LastDataRead);
603 if (debug && i < 16)
604 printk("%02x ", buf[len - 2]);
605 buf[len - 1] = ReadDOC(docptr, Mplus_LastDataRead);
606 if (debug && i < 16)
607 printk("%02x ", buf[len - 1]);
608 if (debug)
609 printk("\n");
610 }
611
612 static int doc2001plus_verifybuf(struct mtd_info *mtd, const u_char *buf, int len)
613 {
614 struct nand_chip *this = mtd->priv;
615 struct doc_priv *doc = this->priv;
616 void __iomem *docptr = doc->virtadr;
617 int i;
618
619 if (debug)
620 printk("verifybuf of %d bytes: ", len);
621
622 /* Start read pipeline */
623 ReadDOC(docptr, Mplus_ReadPipeInit);
624 ReadDOC(docptr, Mplus_ReadPipeInit);
625
626 for (i = 0; i < len - 2; i++)
627 if (buf[i] != ReadDOC(docptr, Mil_CDSN_IO)) {
628 ReadDOC(docptr, Mplus_LastDataRead);
629 ReadDOC(docptr, Mplus_LastDataRead);
630 return i;
631 }
632 if (buf[len - 2] != ReadDOC(docptr, Mplus_LastDataRead))
633 return len - 2;
634 if (buf[len - 1] != ReadDOC(docptr, Mplus_LastDataRead))
635 return len - 1;
636 return 0;
637 }
638
639 static void doc2001plus_select_chip(struct mtd_info *mtd, int chip)
640 {
641 struct nand_chip *this = mtd->priv;
642 struct doc_priv *doc = this->priv;
643 void __iomem *docptr = doc->virtadr;
644 int floor = 0;
645
646 if (debug)
647 printk("select chip (%d)\n", chip);
648
649 if (chip == -1) {
650 /* Disable flash internally */
651 WriteDOC(0, docptr, Mplus_FlashSelect);
652 return;
653 }
654
655 floor = chip / doc->chips_per_floor;
656 chip -= (floor * doc->chips_per_floor);
657
658 /* Assert ChipEnable and deassert WriteProtect */
659 WriteDOC((DOC_FLASH_CE), docptr, Mplus_FlashSelect);
660 this->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
661
662 doc->curchip = chip;
663 doc->curfloor = floor;
664 }
665
666 static void doc200x_select_chip(struct mtd_info *mtd, int chip)
667 {
668 struct nand_chip *this = mtd->priv;
669 struct doc_priv *doc = this->priv;
670 void __iomem *docptr = doc->virtadr;
671 int floor = 0;
672
673 if (debug)
674 printk("select chip (%d)\n", chip);
675
676 if (chip == -1)
677 return;
678
679 floor = chip / doc->chips_per_floor;
680 chip -= (floor * doc->chips_per_floor);
681
682 /* 11.4.4 -- deassert CE before changing chip */
683 doc200x_hwcontrol(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
684
685 WriteDOC(floor, docptr, FloorSelect);
686 WriteDOC(chip, docptr, CDSNDeviceSelect);
687
688 doc200x_hwcontrol(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
689
690 doc->curchip = chip;
691 doc->curfloor = floor;
692 }
693
694 #define CDSN_CTRL_MSK (CDSN_CTRL_CE | CDSN_CTRL_CLE | CDSN_CTRL_ALE)
695
696 static void doc200x_hwcontrol(struct mtd_info *mtd, int cmd,
697 unsigned int ctrl)
698 {
699 struct nand_chip *this = mtd->priv;
700 struct doc_priv *doc = this->priv;
701 void __iomem *docptr = doc->virtadr;
702
703 if (ctrl & NAND_CTRL_CHANGE) {
704 doc->CDSNControl &= ~CDSN_CTRL_MSK;
705 doc->CDSNControl |= ctrl & CDSN_CTRL_MSK;
706 if (debug)
707 printk("hwcontrol(%d): %02x\n", cmd, doc->CDSNControl);
708 WriteDOC(doc->CDSNControl, docptr, CDSNControl);
709 /* 11.4.3 -- 4 NOPs after CSDNControl write */
710 DoC_Delay(doc, 4);
711 }
712 if (cmd != NAND_CMD_NONE) {
713 if (DoC_is_2000(doc))
714 doc2000_write_byte(mtd, cmd);
715 else
716 doc2001_write_byte(mtd, cmd);
717 }
718 }
719
720 static void doc2001plus_command(struct mtd_info *mtd, unsigned command, int column, int page_addr)
721 {
722 struct nand_chip *this = mtd->priv;
723 struct doc_priv *doc = this->priv;
724 void __iomem *docptr = doc->virtadr;
725
726 /*
727 * Must terminate write pipeline before sending any commands
728 * to the device.
729 */
730 if (command == NAND_CMD_PAGEPROG) {
731 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
732 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
733 }
734
735 /*
736 * Write out the command to the device.
737 */
738 if (command == NAND_CMD_SEQIN) {
739 int readcmd;
740
741 if (column >= mtd->writesize) {
742 /* OOB area */
743 column -= mtd->writesize;
744 readcmd = NAND_CMD_READOOB;
745 } else if (column < 256) {
746 /* First 256 bytes --> READ0 */
747 readcmd = NAND_CMD_READ0;
748 } else {
749 column -= 256;
750 readcmd = NAND_CMD_READ1;
751 }
752 WriteDOC(readcmd, docptr, Mplus_FlashCmd);
753 }
754 WriteDOC(command, docptr, Mplus_FlashCmd);
755 WriteDOC(0, docptr, Mplus_WritePipeTerm);
756 WriteDOC(0, docptr, Mplus_WritePipeTerm);
757
758 if (column != -1 || page_addr != -1) {
759 /* Serially input address */
760 if (column != -1) {
761 /* Adjust columns for 16 bit buswidth */
762 if (this->options & NAND_BUSWIDTH_16)
763 column >>= 1;
764 WriteDOC(column, docptr, Mplus_FlashAddress);
765 }
766 if (page_addr != -1) {
767 WriteDOC((unsigned char)(page_addr & 0xff), docptr, Mplus_FlashAddress);
768 WriteDOC((unsigned char)((page_addr >> 8) & 0xff), docptr, Mplus_FlashAddress);
769 /* One more address cycle for higher density devices */
770 if (this->chipsize & 0x0c000000) {
771 WriteDOC((unsigned char)((page_addr >> 16) & 0x0f), docptr, Mplus_FlashAddress);
772 printk("high density\n");
773 }
774 }
775 WriteDOC(0, docptr, Mplus_WritePipeTerm);
776 WriteDOC(0, docptr, Mplus_WritePipeTerm);
777 /* deassert ALE */
778 if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
779 command == NAND_CMD_READOOB || command == NAND_CMD_READID)
780 WriteDOC(0, docptr, Mplus_FlashControl);
781 }
782
783 /*
784 * program and erase have their own busy handlers
785 * status and sequential in needs no delay
786 */
787 switch (command) {
788
789 case NAND_CMD_PAGEPROG:
790 case NAND_CMD_ERASE1:
791 case NAND_CMD_ERASE2:
792 case NAND_CMD_SEQIN:
793 case NAND_CMD_STATUS:
794 return;
795
796 case NAND_CMD_RESET:
797 if (this->dev_ready)
798 break;
799 udelay(this->chip_delay);
800 WriteDOC(NAND_CMD_STATUS, docptr, Mplus_FlashCmd);
801 WriteDOC(0, docptr, Mplus_WritePipeTerm);
802 WriteDOC(0, docptr, Mplus_WritePipeTerm);
803 while (!(this->read_byte(mtd) & 0x40)) ;
804 return;
805
806 /* This applies to read commands */
807 default:
808 /*
809 * If we don't have access to the busy pin, we apply the given
810 * command delay
811 */
812 if (!this->dev_ready) {
813 udelay(this->chip_delay);
814 return;
815 }
816 }
817
818 /* Apply this short delay always to ensure that we do wait tWB in
819 * any case on any machine. */
820 ndelay(100);
821 /* wait until command is processed */
822 while (!this->dev_ready(mtd)) ;
823 }
824
825 static int doc200x_dev_ready(struct mtd_info *mtd)
826 {
827 struct nand_chip *this = mtd->priv;
828 struct doc_priv *doc = this->priv;
829 void __iomem *docptr = doc->virtadr;
830
831 if (DoC_is_MillenniumPlus(doc)) {
832 /* 11.4.2 -- must NOP four times before checking FR/B# */
833 DoC_Delay(doc, 4);
834 if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) {
835 if (debug)
836 printk("not ready\n");
837 return 0;
838 }
839 if (debug)
840 printk("was ready\n");
841 return 1;
842 } else {
843 /* 11.4.2 -- must NOP four times before checking FR/B# */
844 DoC_Delay(doc, 4);
845 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
846 if (debug)
847 printk("not ready\n");
848 return 0;
849 }
850 /* 11.4.2 -- Must NOP twice if it's ready */
851 DoC_Delay(doc, 2);
852 if (debug)
853 printk("was ready\n");
854 return 1;
855 }
856 }
857
858 static int doc200x_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
859 {
860 /* This is our last resort if we couldn't find or create a BBT. Just
861 pretend all blocks are good. */
862 return 0;
863 }
864
865 static void doc200x_enable_hwecc(struct mtd_info *mtd, int mode)
866 {
867 struct nand_chip *this = mtd->priv;
868 struct doc_priv *doc = this->priv;
869 void __iomem *docptr = doc->virtadr;
870
871 /* Prime the ECC engine */
872 switch (mode) {
873 case NAND_ECC_READ:
874 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
875 WriteDOC(DOC_ECC_EN, docptr, ECCConf);
876 break;
877 case NAND_ECC_WRITE:
878 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
879 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
880 break;
881 }
882 }
883
884 static void doc2001plus_enable_hwecc(struct mtd_info *mtd, int mode)
885 {
886 struct nand_chip *this = mtd->priv;
887 struct doc_priv *doc = this->priv;
888 void __iomem *docptr = doc->virtadr;
889
890 /* Prime the ECC engine */
891 switch (mode) {
892 case NAND_ECC_READ:
893 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
894 WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);
895 break;
896 case NAND_ECC_WRITE:
897 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
898 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf);
899 break;
900 }
901 }
902
903 /* This code is only called on write */
904 static int doc200x_calculate_ecc(struct mtd_info *mtd, const u_char *dat, unsigned char *ecc_code)
905 {
906 struct nand_chip *this = mtd->priv;
907 struct doc_priv *doc = this->priv;
908 void __iomem *docptr = doc->virtadr;
909 int i;
910 int emptymatch = 1;
911
912 /* flush the pipeline */
913 if (DoC_is_2000(doc)) {
914 WriteDOC(doc->CDSNControl & ~CDSN_CTRL_FLASH_IO, docptr, CDSNControl);
915 WriteDOC(0, docptr, 2k_CDSN_IO);
916 WriteDOC(0, docptr, 2k_CDSN_IO);
917 WriteDOC(0, docptr, 2k_CDSN_IO);
918 WriteDOC(doc->CDSNControl, docptr, CDSNControl);
919 } else if (DoC_is_MillenniumPlus(doc)) {
920 WriteDOC(0, docptr, Mplus_NOP);
921 WriteDOC(0, docptr, Mplus_NOP);
922 WriteDOC(0, docptr, Mplus_NOP);
923 } else {
924 WriteDOC(0, docptr, NOP);
925 WriteDOC(0, docptr, NOP);
926 WriteDOC(0, docptr, NOP);
927 }
928
929 for (i = 0; i < 6; i++) {
930 if (DoC_is_MillenniumPlus(doc))
931 ecc_code[i] = ReadDOC_(docptr, DoC_Mplus_ECCSyndrome0 + i);
932 else
933 ecc_code[i] = ReadDOC_(docptr, DoC_ECCSyndrome0 + i);
934 if (ecc_code[i] != empty_write_ecc[i])
935 emptymatch = 0;
936 }
937 if (DoC_is_MillenniumPlus(doc))
938 WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
939 else
940 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
941 #if 0
942 /* If emptymatch=1, we might have an all-0xff data buffer. Check. */
943 if (emptymatch) {
944 /* Note: this somewhat expensive test should not be triggered
945 often. It could be optimized away by examining the data in
946 the writebuf routine, and remembering the result. */
947 for (i = 0; i < 512; i++) {
948 if (dat[i] == 0xff)
949 continue;
950 emptymatch = 0;
951 break;
952 }
953 }
954 /* If emptymatch still =1, we do have an all-0xff data buffer.
955 Return all-0xff ecc value instead of the computed one, so
956 it'll look just like a freshly-erased page. */
957 if (emptymatch)
958 memset(ecc_code, 0xff, 6);
959 #endif
960 return 0;
961 }
962
963 static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
964 u_char *read_ecc, u_char *isnull)
965 {
966 int i, ret = 0;
967 struct nand_chip *this = mtd->priv;
968 struct doc_priv *doc = this->priv;
969 void __iomem *docptr = doc->virtadr;
970 uint8_t calc_ecc[6];
971 volatile u_char dummy;
972 int emptymatch = 1;
973
974 /* flush the pipeline */
975 if (DoC_is_2000(doc)) {
976 dummy = ReadDOC(docptr, 2k_ECCStatus);
977 dummy = ReadDOC(docptr, 2k_ECCStatus);
978 dummy = ReadDOC(docptr, 2k_ECCStatus);
979 } else if (DoC_is_MillenniumPlus(doc)) {
980 dummy = ReadDOC(docptr, Mplus_ECCConf);
981 dummy = ReadDOC(docptr, Mplus_ECCConf);
982 dummy = ReadDOC(docptr, Mplus_ECCConf);
983 } else {
984 dummy = ReadDOC(docptr, ECCConf);
985 dummy = ReadDOC(docptr, ECCConf);
986 dummy = ReadDOC(docptr, ECCConf);
987 }
988
989 /* Error occurred ? */
990 if (dummy & 0x80) {
991 for (i = 0; i < 6; i++) {
992 if (DoC_is_MillenniumPlus(doc))
993 calc_ecc[i] = ReadDOC_(docptr, DoC_Mplus_ECCSyndrome0 + i);
994 else
995 calc_ecc[i] = ReadDOC_(docptr, DoC_ECCSyndrome0 + i);
996 if (calc_ecc[i] != empty_read_syndrome[i])
997 emptymatch = 0;
998 }
999 /* If emptymatch=1, the read syndrome is consistent with an
1000 all-0xff data and stored ecc block. Check the stored ecc. */
1001 if (emptymatch) {
1002 for (i = 0; i < 6; i++) {
1003 if (read_ecc[i] == 0xff)
1004 continue;
1005 emptymatch = 0;
1006 break;
1007 }
1008 }
1009 /* If emptymatch still =1, check the data block. */
1010 if (emptymatch) {
1011 /* Note: this somewhat expensive test should not be triggered
1012 often. It could be optimized away by examining the data in
1013 the readbuf routine, and remembering the result. */
1014 for (i = 0; i < 512; i++) {
1015 if (dat[i] == 0xff)
1016 continue;
1017 emptymatch = 0;
1018 break;
1019 }
1020 }
1021 /* If emptymatch still =1, this is almost certainly a freshly-
1022 erased block, in which case the ECC will not come out right.
1023 We'll suppress the error and tell the caller everything's
1024 OK. Because it is. */
1025 if (!emptymatch)
1026 ret = doc_ecc_decode(rs_decoder, dat, calc_ecc);
1027 if (ret > 0)
1028 printk(KERN_ERR "doc200x_correct_data corrected %d errors\n", ret);
1029 }
1030 if (DoC_is_MillenniumPlus(doc))
1031 WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
1032 else
1033 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1034 if (no_ecc_failures && (ret == -EBADMSG)) {
1035 printk(KERN_ERR "suppressing ECC failure\n");
1036 ret = 0;
1037 }
1038 return ret;
1039 }
1040
1041 //u_char mydatabuf[528];
1042
1043 /* The strange out-of-order .oobfree list below is a (possibly unneeded)
1044 * attempt to retain compatibility. It used to read:
1045 * .oobfree = { {8, 8} }
1046 * Since that leaves two bytes unusable, it was changed. But the following
1047 * scheme might affect existing jffs2 installs by moving the cleanmarker:
1048 * .oobfree = { {6, 10} }
1049 * jffs2 seems to handle the above gracefully, but the current scheme seems
1050 * safer. The only problem with it is that any code that parses oobfree must
1051 * be able to handle out-of-order segments.
1052 */
1053 static struct nand_ecclayout doc200x_oobinfo = {
1054 .eccbytes = 6,
1055 .eccpos = {0, 1, 2, 3, 4, 5},
1056 .oobfree = {{8, 8}, {6, 2}}
1057 };
1058
1059 /* Find the (I)NFTL Media Header, and optionally also the mirror media header.
1060 On successful return, buf will contain a copy of the media header for
1061 further processing. id is the string to scan for, and will presumably be
1062 either "ANAND" or "BNAND". If findmirror=1, also look for the mirror media
1063 header. The page #s of the found media headers are placed in mh0_page and
1064 mh1_page in the DOC private structure. */
1065 static int __init find_media_headers(struct mtd_info *mtd, u_char *buf, const char *id, int findmirror)
1066 {
1067 struct nand_chip *this = mtd->priv;
1068 struct doc_priv *doc = this->priv;
1069 unsigned offs;
1070 int ret;
1071 size_t retlen;
1072
1073 for (offs = 0; offs < mtd->size; offs += mtd->erasesize) {
1074 ret = mtd->read(mtd, offs, mtd->writesize, &retlen, buf);
1075 if (retlen != mtd->writesize)
1076 continue;
1077 if (ret) {
1078 printk(KERN_WARNING "ECC error scanning DOC at 0x%x\n", offs);
1079 }
1080 if (memcmp(buf, id, 6))
1081 continue;
1082 printk(KERN_INFO "Found DiskOnChip %s Media Header at 0x%x\n", id, offs);
1083 if (doc->mh0_page == -1) {
1084 doc->mh0_page = offs >> this->page_shift;
1085 if (!findmirror)
1086 return 1;
1087 continue;
1088 }
1089 doc->mh1_page = offs >> this->page_shift;
1090 return 2;
1091 }
1092 if (doc->mh0_page == -1) {
1093 printk(KERN_WARNING "DiskOnChip %s Media Header not found.\n", id);
1094 return 0;
1095 }
1096 /* Only one mediaheader was found. We want buf to contain a
1097 mediaheader on return, so we'll have to re-read the one we found. */
1098 offs = doc->mh0_page << this->page_shift;
1099 ret = mtd->read(mtd, offs, mtd->writesize, &retlen, buf);
1100 if (retlen != mtd->writesize) {
1101 /* Insanity. Give up. */
1102 printk(KERN_ERR "Read DiskOnChip Media Header once, but can't reread it???\n");
1103 return 0;
1104 }
1105 return 1;
1106 }
1107
1108 static inline int __init nftl_partscan(struct mtd_info *mtd, struct mtd_partition *parts)
1109 {
1110 struct nand_chip *this = mtd->priv;
1111 struct doc_priv *doc = this->priv;
1112 int ret = 0;
1113 u_char *buf;
1114 struct NFTLMediaHeader *mh;
1115 const unsigned psize = 1 << this->page_shift;
1116 int numparts = 0;
1117 unsigned blocks, maxblocks;
1118 int offs, numheaders;
1119
1120 buf = kmalloc(mtd->writesize, GFP_KERNEL);
1121 if (!buf) {
1122 printk(KERN_ERR "DiskOnChip mediaheader kmalloc failed!\n");
1123 return 0;
1124 }
1125 if (!(numheaders = find_media_headers(mtd, buf, "ANAND", 1)))
1126 goto out;
1127 mh = (struct NFTLMediaHeader *)buf;
1128
1129 le16_to_cpus(&mh->NumEraseUnits);
1130 le16_to_cpus(&mh->FirstPhysicalEUN);
1131 le32_to_cpus(&mh->FormattedSize);
1132
1133 printk(KERN_INFO " DataOrgID = %s\n"
1134 " NumEraseUnits = %d\n"
1135 " FirstPhysicalEUN = %d\n"
1136 " FormattedSize = %d\n"
1137 " UnitSizeFactor = %d\n",
1138 mh->DataOrgID, mh->NumEraseUnits,
1139 mh->FirstPhysicalEUN, mh->FormattedSize,
1140 mh->UnitSizeFactor);
1141
1142 blocks = mtd->size >> this->phys_erase_shift;
1143 maxblocks = min(32768U, mtd->erasesize - psize);
1144
1145 if (mh->UnitSizeFactor == 0x00) {
1146 /* Auto-determine UnitSizeFactor. The constraints are:
1147 - There can be at most 32768 virtual blocks.
1148 - There can be at most (virtual block size - page size)
1149 virtual blocks (because MediaHeader+BBT must fit in 1).
1150 */
1151 mh->UnitSizeFactor = 0xff;
1152 while (blocks > maxblocks) {
1153 blocks >>= 1;
1154 maxblocks = min(32768U, (maxblocks << 1) + psize);
1155 mh->UnitSizeFactor--;
1156 }
1157 printk(KERN_WARNING "UnitSizeFactor=0x00 detected. Correct value is assumed to be 0x%02x.\n", mh->UnitSizeFactor);
1158 }
1159
1160 /* NOTE: The lines below modify internal variables of the NAND and MTD
1161 layers; variables with have already been configured by nand_scan.
1162 Unfortunately, we didn't know before this point what these values
1163 should be. Thus, this code is somewhat dependent on the exact
1164 implementation of the NAND layer. */
1165 if (mh->UnitSizeFactor != 0xff) {
1166 this->bbt_erase_shift += (0xff - mh->UnitSizeFactor);
1167 mtd->erasesize <<= (0xff - mh->UnitSizeFactor);
1168 printk(KERN_INFO "Setting virtual erase size to %d\n", mtd->erasesize);
1169 blocks = mtd->size >> this->bbt_erase_shift;
1170 maxblocks = min(32768U, mtd->erasesize - psize);
1171 }
1172
1173 if (blocks > maxblocks) {
1174 printk(KERN_ERR "UnitSizeFactor of 0x%02x is inconsistent with device size. Aborting.\n", mh->UnitSizeFactor);
1175 goto out;
1176 }
1177
1178 /* Skip past the media headers. */
1179 offs = max(doc->mh0_page, doc->mh1_page);
1180 offs <<= this->page_shift;
1181 offs += mtd->erasesize;
1182
1183 if (show_firmware_partition == 1) {
1184 parts[0].name = " DiskOnChip Firmware / Media Header partition";
1185 parts[0].offset = 0;
1186 parts[0].size = offs;
1187 numparts = 1;
1188 }
1189
1190 parts[numparts].name = " DiskOnChip BDTL partition";
1191 parts[numparts].offset = offs;
1192 parts[numparts].size = (mh->NumEraseUnits - numheaders) << this->bbt_erase_shift;
1193
1194 offs += parts[numparts].size;
1195 numparts++;
1196
1197 if (offs < mtd->size) {
1198 parts[numparts].name = " DiskOnChip Remainder partition";
1199 parts[numparts].offset = offs;
1200 parts[numparts].size = mtd->size - offs;
1201 numparts++;
1202 }
1203
1204 ret = numparts;
1205 out:
1206 kfree(buf);
1207 return ret;
1208 }
1209
1210 /* This is a stripped-down copy of the code in inftlmount.c */
1211 static inline int __init inftl_partscan(struct mtd_info *mtd, struct mtd_partition *parts)
1212 {
1213 struct nand_chip *this = mtd->priv;
1214 struct doc_priv *doc = this->priv;
1215 int ret = 0;
1216 u_char *buf;
1217 struct INFTLMediaHeader *mh;
1218 struct INFTLPartition *ip;
1219 int numparts = 0;
1220 int blocks;
1221 int vshift, lastvunit = 0;
1222 int i;
1223 int end = mtd->size;
1224
1225 if (inftl_bbt_write)
1226 end -= (INFTL_BBT_RESERVED_BLOCKS << this->phys_erase_shift);
1227
1228 buf = kmalloc(mtd->writesize, GFP_KERNEL);
1229 if (!buf) {
1230 printk(KERN_ERR "DiskOnChip mediaheader kmalloc failed!\n");
1231 return 0;
1232 }
1233
1234 if (!find_media_headers(mtd, buf, "BNAND", 0))
1235 goto out;
1236 doc->mh1_page = doc->mh0_page + (4096 >> this->page_shift);
1237 mh = (struct INFTLMediaHeader *)buf;
1238
1239 le32_to_cpus(&mh->NoOfBootImageBlocks);
1240 le32_to_cpus(&mh->NoOfBinaryPartitions);
1241 le32_to_cpus(&mh->NoOfBDTLPartitions);
1242 le32_to_cpus(&mh->BlockMultiplierBits);
1243 le32_to_cpus(&mh->FormatFlags);
1244 le32_to_cpus(&mh->PercentUsed);
1245
1246 printk(KERN_INFO " bootRecordID = %s\n"
1247 " NoOfBootImageBlocks = %d\n"
1248 " NoOfBinaryPartitions = %d\n"
1249 " NoOfBDTLPartitions = %d\n"
1250 " BlockMultiplerBits = %d\n"
1251 " FormatFlgs = %d\n"
1252 " OsakVersion = %d.%d.%d.%d\n"
1253 " PercentUsed = %d\n",
1254 mh->bootRecordID, mh->NoOfBootImageBlocks,
1255 mh->NoOfBinaryPartitions,
1256 mh->NoOfBDTLPartitions,
1257 mh->BlockMultiplierBits, mh->FormatFlags,
1258 ((unsigned char *) &mh->OsakVersion)[0] & 0xf,
1259 ((unsigned char *) &mh->OsakVersion)[1] & 0xf,
1260 ((unsigned char *) &mh->OsakVersion)[2] & 0xf,
1261 ((unsigned char *) &mh->OsakVersion)[3] & 0xf,
1262 mh->PercentUsed);
1263
1264 vshift = this->phys_erase_shift + mh->BlockMultiplierBits;
1265
1266 blocks = mtd->size >> vshift;
1267 if (blocks > 32768) {
1268 printk(KERN_ERR "BlockMultiplierBits=%d is inconsistent with device size. Aborting.\n", mh->BlockMultiplierBits);
1269 goto out;
1270 }
1271
1272 blocks = doc->chips_per_floor << (this->chip_shift - this->phys_erase_shift);
1273 if (inftl_bbt_write && (blocks > mtd->erasesize)) {
1274 printk(KERN_ERR "Writeable BBTs spanning more than one erase block are not yet supported. FIX ME!\n");
1275 goto out;
1276 }
1277
1278 /* Scan the partitions */
1279 for (i = 0; (i < 4); i++) {
1280 ip = &(mh->Partitions[i]);
1281 le32_to_cpus(&ip->virtualUnits);
1282 le32_to_cpus(&ip->firstUnit);
1283 le32_to_cpus(&ip->lastUnit);
1284 le32_to_cpus(&ip->flags);
1285 le32_to_cpus(&ip->spareUnits);
1286 le32_to_cpus(&ip->Reserved0);
1287
1288 printk(KERN_INFO " PARTITION[%d] ->\n"
1289 " virtualUnits = %d\n"
1290 " firstUnit = %d\n"
1291 " lastUnit = %d\n"
1292 " flags = 0x%x\n"
1293 " spareUnits = %d\n",
1294 i, ip->virtualUnits, ip->firstUnit,
1295 ip->lastUnit, ip->flags,
1296 ip->spareUnits);
1297
1298 if ((show_firmware_partition == 1) &&
1299 (i == 0) && (ip->firstUnit > 0)) {
1300 parts[0].name = " DiskOnChip IPL / Media Header partition";
1301 parts[0].offset = 0;
1302 parts[0].size = mtd->erasesize * ip->firstUnit;
1303 numparts = 1;
1304 }
1305
1306 if (ip->flags & INFTL_BINARY)
1307 parts[numparts].name = " DiskOnChip BDK partition";
1308 else
1309 parts[numparts].name = " DiskOnChip BDTL partition";
1310 parts[numparts].offset = ip->firstUnit << vshift;
1311 parts[numparts].size = (1 + ip->lastUnit - ip->firstUnit) << vshift;
1312 numparts++;
1313 if (ip->lastUnit > lastvunit)
1314 lastvunit = ip->lastUnit;
1315 if (ip->flags & INFTL_LAST)
1316 break;
1317 }
1318 lastvunit++;
1319 if ((lastvunit << vshift) < end) {
1320 parts[numparts].name = " DiskOnChip Remainder partition";
1321 parts[numparts].offset = lastvunit << vshift;
1322 parts[numparts].size = end - parts[numparts].offset;
1323 numparts++;
1324 }
1325 ret = numparts;
1326 out:
1327 kfree(buf);
1328 return ret;
1329 }
1330
1331 static int __init nftl_scan_bbt(struct mtd_info *mtd)
1332 {
1333 int ret, numparts;
1334 struct nand_chip *this = mtd->priv;
1335 struct doc_priv *doc = this->priv;
1336 struct mtd_partition parts[2];
1337
1338 memset((char *)parts, 0, sizeof(parts));
1339 /* On NFTL, we have to find the media headers before we can read the
1340 BBTs, since they're stored in the media header eraseblocks. */
1341 numparts = nftl_partscan(mtd, parts);
1342 if (!numparts)
1343 return -EIO;
1344 this->bbt_td->options = NAND_BBT_ABSPAGE | NAND_BBT_8BIT |
1345 NAND_BBT_SAVECONTENT | NAND_BBT_WRITE |
1346 NAND_BBT_VERSION;
1347 this->bbt_td->veroffs = 7;
1348 this->bbt_td->pages[0] = doc->mh0_page + 1;
1349 if (doc->mh1_page != -1) {
1350 this->bbt_md->options = NAND_BBT_ABSPAGE | NAND_BBT_8BIT |
1351 NAND_BBT_SAVECONTENT | NAND_BBT_WRITE |
1352 NAND_BBT_VERSION;
1353 this->bbt_md->veroffs = 7;
1354 this->bbt_md->pages[0] = doc->mh1_page + 1;
1355 } else {
1356 this->bbt_md = NULL;
1357 }
1358
1359 /* It's safe to set bd=NULL below because NAND_BBT_CREATE is not set.
1360 At least as nand_bbt.c is currently written. */
1361 if ((ret = nand_scan_bbt(mtd, NULL)))
1362 return ret;
1363 add_mtd_device(mtd);
1364 #ifdef CONFIG_MTD_PARTITIONS
1365 if (!no_autopart)
1366 add_mtd_partitions(mtd, parts, numparts);
1367 #endif
1368 return 0;
1369 }
1370
1371 static int __init inftl_scan_bbt(struct mtd_info *mtd)
1372 {
1373 int ret, numparts;
1374 struct nand_chip *this = mtd->priv;
1375 struct doc_priv *doc = this->priv;
1376 struct mtd_partition parts[5];
1377
1378 if (this->numchips > doc->chips_per_floor) {
1379 printk(KERN_ERR "Multi-floor INFTL devices not yet supported.\n");
1380 return -EIO;
1381 }
1382
1383 if (DoC_is_MillenniumPlus(doc)) {
1384 this->bbt_td->options = NAND_BBT_2BIT | NAND_BBT_ABSPAGE;
1385 if (inftl_bbt_write)
1386 this->bbt_td->options |= NAND_BBT_WRITE;
1387 this->bbt_td->pages[0] = 2;
1388 this->bbt_md = NULL;
1389 } else {
1390 this->bbt_td->options = NAND_BBT_LASTBLOCK | NAND_BBT_8BIT | NAND_BBT_VERSION;
1391 if (inftl_bbt_write)
1392 this->bbt_td->options |= NAND_BBT_WRITE;
1393 this->bbt_td->offs = 8;
1394 this->bbt_td->len = 8;
1395 this->bbt_td->veroffs = 7;
1396 this->bbt_td->maxblocks = INFTL_BBT_RESERVED_BLOCKS;
1397 this->bbt_td->reserved_block_code = 0x01;
1398 this->bbt_td->pattern = "MSYS_BBT";
1399
1400 this->bbt_md->options = NAND_BBT_LASTBLOCK | NAND_BBT_8BIT | NAND_BBT_VERSION;
1401 if (inftl_bbt_write)
1402 this->bbt_md->options |= NAND_BBT_WRITE;
1403 this->bbt_md->offs = 8;
1404 this->bbt_md->len = 8;
1405 this->bbt_md->veroffs = 7;
1406 this->bbt_md->maxblocks = INFTL_BBT_RESERVED_BLOCKS;
1407 this->bbt_md->reserved_block_code = 0x01;
1408 this->bbt_md->pattern = "TBB_SYSM";
1409 }
1410
1411 /* It's safe to set bd=NULL below because NAND_BBT_CREATE is not set.
1412 At least as nand_bbt.c is currently written. */
1413 if ((ret = nand_scan_bbt(mtd, NULL)))
1414 return ret;
1415 memset((char *)parts, 0, sizeof(parts));
1416 numparts = inftl_partscan(mtd, parts);
1417 /* At least for now, require the INFTL Media Header. We could probably
1418 do without it for non-INFTL use, since all it gives us is
1419 autopartitioning, but I want to give it more thought. */
1420 if (!numparts)
1421 return -EIO;
1422 add_mtd_device(mtd);
1423 #ifdef CONFIG_MTD_PARTITIONS
1424 if (!no_autopart)
1425 add_mtd_partitions(mtd, parts, numparts);
1426 #endif
1427 return 0;
1428 }
1429
1430 static inline int __init doc2000_init(struct mtd_info *mtd)
1431 {
1432 struct nand_chip *this = mtd->priv;
1433 struct doc_priv *doc = this->priv;
1434
1435 this->read_byte = doc2000_read_byte;
1436 this->write_buf = doc2000_writebuf;
1437 this->read_buf = doc2000_readbuf;
1438 this->verify_buf = doc2000_verifybuf;
1439 this->scan_bbt = nftl_scan_bbt;
1440
1441 doc->CDSNControl = CDSN_CTRL_FLASH_IO | CDSN_CTRL_ECC_IO;
1442 doc2000_count_chips(mtd);
1443 mtd->name = "DiskOnChip 2000 (NFTL Model)";
1444 return (4 * doc->chips_per_floor);
1445 }
1446
1447 static inline int __init doc2001_init(struct mtd_info *mtd)
1448 {
1449 struct nand_chip *this = mtd->priv;
1450 struct doc_priv *doc = this->priv;
1451
1452 this->read_byte = doc2001_read_byte;
1453 this->write_buf = doc2001_writebuf;
1454 this->read_buf = doc2001_readbuf;
1455 this->verify_buf = doc2001_verifybuf;
1456
1457 ReadDOC(doc->virtadr, ChipID);
1458 ReadDOC(doc->virtadr, ChipID);
1459 ReadDOC(doc->virtadr, ChipID);
1460 if (ReadDOC(doc->virtadr, ChipID) != DOC_ChipID_DocMil) {
1461 /* It's not a Millennium; it's one of the newer
1462 DiskOnChip 2000 units with a similar ASIC.
1463 Treat it like a Millennium, except that it
1464 can have multiple chips. */
1465 doc2000_count_chips(mtd);
1466 mtd->name = "DiskOnChip 2000 (INFTL Model)";
1467 this->scan_bbt = inftl_scan_bbt;
1468 return (4 * doc->chips_per_floor);
1469 } else {
1470 /* Bog-standard Millennium */
1471 doc->chips_per_floor = 1;
1472 mtd->name = "DiskOnChip Millennium";
1473 this->scan_bbt = nftl_scan_bbt;
1474 return 1;
1475 }
1476 }
1477
1478 static inline int __init doc2001plus_init(struct mtd_info *mtd)
1479 {
1480 struct nand_chip *this = mtd->priv;
1481 struct doc_priv *doc = this->priv;
1482
1483 this->read_byte = doc2001plus_read_byte;
1484 this->write_buf = doc2001plus_writebuf;
1485 this->read_buf = doc2001plus_readbuf;
1486 this->verify_buf = doc2001plus_verifybuf;
1487 this->scan_bbt = inftl_scan_bbt;
1488 this->cmd_ctrl = NULL;
1489 this->select_chip = doc2001plus_select_chip;
1490 this->cmdfunc = doc2001plus_command;
1491 this->ecc.hwctl = doc2001plus_enable_hwecc;
1492
1493 doc->chips_per_floor = 1;
1494 mtd->name = "DiskOnChip Millennium Plus";
1495
1496 return 1;
1497 }
1498
1499 static int __init doc_probe(unsigned long physadr)
1500 {
1501 unsigned char ChipID;
1502 struct mtd_info *mtd;
1503 struct nand_chip *nand;
1504 struct doc_priv *doc;
1505 void __iomem *virtadr;
1506 unsigned char save_control;
1507 unsigned char tmp, tmpb, tmpc;
1508 int reg, len, numchips;
1509 int ret = 0;
1510
1511 virtadr = ioremap(physadr, DOC_IOREMAP_LEN);
1512 if (!virtadr) {
1513 printk(KERN_ERR "Diskonchip ioremap failed: 0x%x bytes at 0x%lx\n", DOC_IOREMAP_LEN, physadr);
1514 return -EIO;
1515 }
1516
1517 /* It's not possible to cleanly detect the DiskOnChip - the
1518 * bootup procedure will put the device into reset mode, and
1519 * it's not possible to talk to it without actually writing
1520 * to the DOCControl register. So we store the current contents
1521 * of the DOCControl register's location, in case we later decide
1522 * that it's not a DiskOnChip, and want to put it back how we
1523 * found it.
1524 */
1525 save_control = ReadDOC(virtadr, DOCControl);
1526
1527 /* Reset the DiskOnChip ASIC */
1528 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET, virtadr, DOCControl);
1529 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET, virtadr, DOCControl);
1530
1531 /* Enable the DiskOnChip ASIC */
1532 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL, virtadr, DOCControl);
1533 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL, virtadr, DOCControl);
1534
1535 ChipID = ReadDOC(virtadr, ChipID);
1536
1537 switch (ChipID) {
1538 case DOC_ChipID_Doc2k:
1539 reg = DoC_2k_ECCStatus;
1540 break;
1541 case DOC_ChipID_DocMil:
1542 reg = DoC_ECCConf;
1543 break;
1544 case DOC_ChipID_DocMilPlus16:
1545 case DOC_ChipID_DocMilPlus32:
1546 case 0:
1547 /* Possible Millennium Plus, need to do more checks */
1548 /* Possibly release from power down mode */
1549 for (tmp = 0; (tmp < 4); tmp++)
1550 ReadDOC(virtadr, Mplus_Power);
1551
1552 /* Reset the Millennium Plus ASIC */
1553 tmp = DOC_MODE_RESET | DOC_MODE_MDWREN | DOC_MODE_RST_LAT | DOC_MODE_BDECT;
1554 WriteDOC(tmp, virtadr, Mplus_DOCControl);
1555 WriteDOC(~tmp, virtadr, Mplus_CtrlConfirm);
1556
1557 mdelay(1);
1558 /* Enable the Millennium Plus ASIC */
1559 tmp = DOC_MODE_NORMAL | DOC_MODE_MDWREN | DOC_MODE_RST_LAT | DOC_MODE_BDECT;
1560 WriteDOC(tmp, virtadr, Mplus_DOCControl);
1561 WriteDOC(~tmp, virtadr, Mplus_CtrlConfirm);
1562 mdelay(1);
1563
1564 ChipID = ReadDOC(virtadr, ChipID);
1565
1566 switch (ChipID) {
1567 case DOC_ChipID_DocMilPlus16:
1568 reg = DoC_Mplus_Toggle;
1569 break;
1570 case DOC_ChipID_DocMilPlus32:
1571 printk(KERN_ERR "DiskOnChip Millennium Plus 32MB is not supported, ignoring.\n");
1572 default:
1573 ret = -ENODEV;
1574 goto notfound;
1575 }
1576 break;
1577
1578 default:
1579 ret = -ENODEV;
1580 goto notfound;
1581 }
1582 /* Check the TOGGLE bit in the ECC register */
1583 tmp = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
1584 tmpb = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
1585 tmpc = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
1586 if ((tmp == tmpb) || (tmp != tmpc)) {
1587 printk(KERN_WARNING "Possible DiskOnChip at 0x%lx failed TOGGLE test, dropping.\n", physadr);
1588 ret = -ENODEV;
1589 goto notfound;
1590 }
1591
1592 for (mtd = doclist; mtd; mtd = doc->nextdoc) {
1593 unsigned char oldval;
1594 unsigned char newval;
1595 nand = mtd->priv;
1596 doc = nand->priv;
1597 /* Use the alias resolution register to determine if this is
1598 in fact the same DOC aliased to a new address. If writes
1599 to one chip's alias resolution register change the value on
1600 the other chip, they're the same chip. */
1601 if (ChipID == DOC_ChipID_DocMilPlus16) {
1602 oldval = ReadDOC(doc->virtadr, Mplus_AliasResolution);
1603 newval = ReadDOC(virtadr, Mplus_AliasResolution);
1604 } else {
1605 oldval = ReadDOC(doc->virtadr, AliasResolution);
1606 newval = ReadDOC(virtadr, AliasResolution);
1607 }
1608 if (oldval != newval)
1609 continue;
1610 if (ChipID == DOC_ChipID_DocMilPlus16) {
1611 WriteDOC(~newval, virtadr, Mplus_AliasResolution);
1612 oldval = ReadDOC(doc->virtadr, Mplus_AliasResolution);
1613 WriteDOC(newval, virtadr, Mplus_AliasResolution); // restore it
1614 } else {
1615 WriteDOC(~newval, virtadr, AliasResolution);
1616 oldval = ReadDOC(doc->virtadr, AliasResolution);
1617 WriteDOC(newval, virtadr, AliasResolution); // restore it
1618 }
1619 newval = ~newval;
1620 if (oldval == newval) {
1621 printk(KERN_DEBUG "Found alias of DOC at 0x%lx to 0x%lx\n", doc->physadr, physadr);
1622 goto notfound;
1623 }
1624 }
1625
1626 printk(KERN_NOTICE "DiskOnChip found at 0x%lx\n", physadr);
1627
1628 len = sizeof(struct mtd_info) +
1629 sizeof(struct nand_chip) + sizeof(struct doc_priv) + (2 * sizeof(struct nand_bbt_descr));
1630 mtd = kzalloc(len, GFP_KERNEL);
1631 if (!mtd) {
1632 printk(KERN_ERR "DiskOnChip kmalloc (%d bytes) failed!\n", len);
1633 ret = -ENOMEM;
1634 goto fail;
1635 }
1636
1637 nand = (struct nand_chip *) (mtd + 1);
1638 doc = (struct doc_priv *) (nand + 1);
1639 nand->bbt_td = (struct nand_bbt_descr *) (doc + 1);
1640 nand->bbt_md = nand->bbt_td + 1;
1641
1642 mtd->priv = nand;
1643 mtd->owner = THIS_MODULE;
1644
1645 nand->priv = doc;
1646 nand->select_chip = doc200x_select_chip;
1647 nand->cmd_ctrl = doc200x_hwcontrol;
1648 nand->dev_ready = doc200x_dev_ready;
1649 nand->waitfunc = doc200x_wait;
1650 nand->block_bad = doc200x_block_bad;
1651 nand->ecc.hwctl = doc200x_enable_hwecc;
1652 nand->ecc.calculate = doc200x_calculate_ecc;
1653 nand->ecc.correct = doc200x_correct_data;
1654
1655 nand->ecc.layout = &doc200x_oobinfo;
1656 nand->ecc.mode = NAND_ECC_HW_SYNDROME;
1657 nand->ecc.size = 512;
1658 nand->ecc.bytes = 6;
1659 nand->options = NAND_USE_FLASH_BBT;
1660
1661 doc->physadr = physadr;
1662 doc->virtadr = virtadr;
1663 doc->ChipID = ChipID;
1664 doc->curfloor = -1;
1665 doc->curchip = -1;
1666 doc->mh0_page = -1;
1667 doc->mh1_page = -1;
1668 doc->nextdoc = doclist;
1669
1670 if (ChipID == DOC_ChipID_Doc2k)
1671 numchips = doc2000_init(mtd);
1672 else if (ChipID == DOC_ChipID_DocMilPlus16)
1673 numchips = doc2001plus_init(mtd);
1674 else
1675 numchips = doc2001_init(mtd);
1676
1677 if ((ret = nand_scan(mtd, numchips))) {
1678 /* DBB note: i believe nand_release is necessary here, as
1679 buffers may have been allocated in nand_base. Check with
1680 Thomas. FIX ME! */
1681 /* nand_release will call del_mtd_device, but we haven't yet
1682 added it. This is handled without incident by
1683 del_mtd_device, as far as I can tell. */
1684 nand_release(mtd);
1685 kfree(mtd);
1686 goto fail;
1687 }
1688
1689 /* Success! */
1690 doclist = mtd;
1691 return 0;
1692
1693 notfound:
1694 /* Put back the contents of the DOCControl register, in case it's not
1695 actually a DiskOnChip. */
1696 WriteDOC(save_control, virtadr, DOCControl);
1697 fail:
1698 iounmap(virtadr);
1699 return ret;
1700 }
1701
1702 static void release_nanddoc(void)
1703 {
1704 struct mtd_info *mtd, *nextmtd;
1705 struct nand_chip *nand;
1706 struct doc_priv *doc;
1707
1708 for (mtd = doclist; mtd; mtd = nextmtd) {
1709 nand = mtd->priv;
1710 doc = nand->priv;
1711
1712 nextmtd = doc->nextdoc;
1713 nand_release(mtd);
1714 iounmap(doc->virtadr);
1715 kfree(mtd);
1716 }
1717 }
1718
1719 static int __init init_nanddoc(void)
1720 {
1721 int i, ret = 0;
1722
1723 /* We could create the decoder on demand, if memory is a concern.
1724 * This way we have it handy, if an error happens
1725 *
1726 * Symbolsize is 10 (bits)
1727 * Primitve polynomial is x^10+x^3+1
1728 * first consecutive root is 510
1729 * primitve element to generate roots = 1
1730 * generator polinomial degree = 4
1731 */
1732 rs_decoder = init_rs(10, 0x409, FCR, 1, NROOTS);
1733 if (!rs_decoder) {
1734 printk(KERN_ERR "DiskOnChip: Could not create a RS decoder\n");
1735 return -ENOMEM;
1736 }
1737
1738 if (doc_config_location) {
1739 printk(KERN_INFO "Using configured DiskOnChip probe address 0x%lx\n", doc_config_location);
1740 ret = doc_probe(doc_config_location);
1741 if (ret < 0)
1742 goto outerr;
1743 } else {
1744 for (i = 0; (doc_locations[i] != 0xffffffff); i++) {
1745 doc_probe(doc_locations[i]);
1746 }
1747 }
1748 /* No banner message any more. Print a message if no DiskOnChip
1749 found, so the user knows we at least tried. */
1750 if (!doclist) {
1751 printk(KERN_INFO "No valid DiskOnChip devices found\n");
1752 ret = -ENODEV;
1753 goto outerr;
1754 }
1755 return 0;
1756 outerr:
1757 free_rs(rs_decoder);
1758 return ret;
1759 }
1760
1761 static void __exit cleanup_nanddoc(void)
1762 {
1763 /* Cleanup the nand/DoC resources */
1764 release_nanddoc();
1765
1766 /* Free the reed solomon resources */
1767 if (rs_decoder) {
1768 free_rs(rs_decoder);
1769 }
1770 }
1771
1772 module_init(init_nanddoc);
1773 module_exit(cleanup_nanddoc);
1774
1775 MODULE_LICENSE("GPL");
1776 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1777 MODULE_DESCRIPTION("M-Systems DiskOnChip 2000, Millennium and Millennium Plus device driver");