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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / mtd / nand / cafe_nand.c
blob22a6b2e50e917467dbacb08f45775934d5a51832
1 /*
2 * Driver for One Laptop Per Child ‘CAFÉ’ controller, aka Marvell 88ALP01
3 *
4 * The data sheet for this device can be found at:
5 * http://www.marvell.com/products/pcconn/88ALP01.jsp
6 *
7 * Copyright © 2006 Red Hat, Inc.
8 * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
9 */
10
11 #define DEBUG
12
13 #include <linux/device.h>
14 #undef DEBUG
15 #include <linux/mtd/mtd.h>
16 #include <linux/mtd/nand.h>
17 #include <linux/mtd/partitions.h>
18 #include <linux/rslib.h>
19 #include <linux/pci.h>
20 #include <linux/delay.h>
21 #include <linux/interrupt.h>
22 #include <linux/dma-mapping.h>
23 #include <asm/io.h>
24
25 #define CAFE_NAND_CTRL1 0x00
26 #define CAFE_NAND_CTRL2 0x04
27 #define CAFE_NAND_CTRL3 0x08
28 #define CAFE_NAND_STATUS 0x0c
29 #define CAFE_NAND_IRQ 0x10
30 #define CAFE_NAND_IRQ_MASK 0x14
31 #define CAFE_NAND_DATA_LEN 0x18
32 #define CAFE_NAND_ADDR1 0x1c
33 #define CAFE_NAND_ADDR2 0x20
34 #define CAFE_NAND_TIMING1 0x24
35 #define CAFE_NAND_TIMING2 0x28
36 #define CAFE_NAND_TIMING3 0x2c
37 #define CAFE_NAND_NONMEM 0x30
38 #define CAFE_NAND_ECC_RESULT 0x3C
39 #define CAFE_NAND_DMA_CTRL 0x40
40 #define CAFE_NAND_DMA_ADDR0 0x44
41 #define CAFE_NAND_DMA_ADDR1 0x48
42 #define CAFE_NAND_ECC_SYN01 0x50
43 #define CAFE_NAND_ECC_SYN23 0x54
44 #define CAFE_NAND_ECC_SYN45 0x58
45 #define CAFE_NAND_ECC_SYN67 0x5c
46 #define CAFE_NAND_READ_DATA 0x1000
47 #define CAFE_NAND_WRITE_DATA 0x2000
48
49 #define CAFE_GLOBAL_CTRL 0x3004
50 #define CAFE_GLOBAL_IRQ 0x3008
51 #define CAFE_GLOBAL_IRQ_MASK 0x300c
52 #define CAFE_NAND_RESET 0x3034
53
54 /* Missing from the datasheet: bit 19 of CTRL1 sets CE0 vs. CE1 */
55 #define CTRL1_CHIPSELECT (1<<19)
56
57 struct cafe_priv {
58 struct nand_chip nand;
59 struct mtd_partition *parts;
60 struct pci_dev *pdev;
61 void __iomem *mmio;
62 struct rs_control *rs;
63 uint32_t ctl1;
64 uint32_t ctl2;
65 int datalen;
66 int nr_data;
67 int data_pos;
68 int page_addr;
69 dma_addr_t dmaaddr;
70 unsigned char *dmabuf;
71 };
72
73 static int usedma = 1;
74 module_param(usedma, int, 0644);
75
76 static int skipbbt = 0;
77 module_param(skipbbt, int, 0644);
78
79 static int debug = 0;
80 module_param(debug, int, 0644);
81
82 static int regdebug = 0;
83 module_param(regdebug, int, 0644);
84
85 static int checkecc = 1;
86 module_param(checkecc, int, 0644);
87
88 static unsigned int numtimings;
89 static int timing[3];
90 module_param_array(timing, int, &numtimings, 0644);
91
92 #ifdef CONFIG_MTD_PARTITIONS
93 static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
94 #endif
95
96 /* Hrm. Why isn't this already conditional on something in the struct device? */
97 #define cafe_dev_dbg(dev, args...) do { if (debug) dev_dbg(dev, ##args); } while(0)
98
99 /* Make it easier to switch to PIO if we need to */
100 #define cafe_readl(cafe, addr) readl((cafe)->mmio + CAFE_##addr)
101 #define cafe_writel(cafe, datum, addr) writel(datum, (cafe)->mmio + CAFE_##addr)
102
103 static int cafe_device_ready(struct mtd_info *mtd)
104 {
105 struct cafe_priv *cafe = mtd->priv;
106 int result = !!(cafe_readl(cafe, NAND_STATUS) | 0x40000000);
107 uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
108
109 cafe_writel(cafe, irqs, NAND_IRQ);
110
111 cafe_dev_dbg(&cafe->pdev->dev, "NAND device is%s ready, IRQ %x (%x) (%x,%x)\n",
112 result?"":" not", irqs, cafe_readl(cafe, NAND_IRQ),
113 cafe_readl(cafe, GLOBAL_IRQ), cafe_readl(cafe, GLOBAL_IRQ_MASK));
114
115 return result;
116 }
117
118
119 static void cafe_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
120 {
121 struct cafe_priv *cafe = mtd->priv;
122
123 if (usedma)
124 memcpy(cafe->dmabuf + cafe->datalen, buf, len);
125 else
126 memcpy_toio(cafe->mmio + CAFE_NAND_WRITE_DATA + cafe->datalen, buf, len);
127
128 cafe->datalen += len;
129
130 cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes to write buffer. datalen 0x%x\n",
131 len, cafe->datalen);
132 }
133
134 static void cafe_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
135 {
136 struct cafe_priv *cafe = mtd->priv;
137
138 if (usedma)
139 memcpy(buf, cafe->dmabuf + cafe->datalen, len);
140 else
141 memcpy_fromio(buf, cafe->mmio + CAFE_NAND_READ_DATA + cafe->datalen, len);
142
143 cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes from position 0x%x in read buffer.\n",
144 len, cafe->datalen);
145 cafe->datalen += len;
146 }
147
148 static uint8_t cafe_read_byte(struct mtd_info *mtd)
149 {
150 struct cafe_priv *cafe = mtd->priv;
151 uint8_t d;
152
153 cafe_read_buf(mtd, &d, 1);
154 cafe_dev_dbg(&cafe->pdev->dev, "Read %02x\n", d);
155
156 return d;
157 }
158
159 static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
160 int column, int page_addr)
161 {
162 struct cafe_priv *cafe = mtd->priv;
163 int adrbytes = 0;
164 uint32_t ctl1;
165 uint32_t doneint = 0x80000000;
166
167 cafe_dev_dbg(&cafe->pdev->dev, "cmdfunc %02x, 0x%x, 0x%x\n",
168 command, column, page_addr);
169
170 if (command == NAND_CMD_ERASE2 || command == NAND_CMD_PAGEPROG) {
171 /* Second half of a command we already calculated */
172 cafe_writel(cafe, cafe->ctl2 | 0x100 | command, NAND_CTRL2);
173 ctl1 = cafe->ctl1;
174 cafe->ctl2 &= ~(1<<30);
175 cafe_dev_dbg(&cafe->pdev->dev, "Continue command, ctl1 %08x, #data %d\n",
176 cafe->ctl1, cafe->nr_data);
177 goto do_command;
178 }
179 /* Reset ECC engine */
180 cafe_writel(cafe, 0, NAND_CTRL2);
181
182 /* Emulate NAND_CMD_READOOB on large-page chips */
183 if (mtd->writesize > 512 &&
184 command == NAND_CMD_READOOB) {
185 column += mtd->writesize;
186 command = NAND_CMD_READ0;
187 }
188
189 /* FIXME: Do we need to send read command before sending data
190 for small-page chips, to position the buffer correctly? */
191
192 if (column != -1) {
193 cafe_writel(cafe, column, NAND_ADDR1);
194 adrbytes = 2;
195 if (page_addr != -1)
196 goto write_adr2;
197 } else if (page_addr != -1) {
198 cafe_writel(cafe, page_addr & 0xffff, NAND_ADDR1);
199 page_addr >>= 16;
200 write_adr2:
201 cafe_writel(cafe, page_addr, NAND_ADDR2);
202 adrbytes += 2;
203 if (mtd->size > mtd->writesize << 16)
204 adrbytes++;
205 }
206
207 cafe->data_pos = cafe->datalen = 0;
208
209 /* Set command valid bit, mask in the chip select bit */
210 ctl1 = 0x80000000 | command | (cafe->ctl1 & CTRL1_CHIPSELECT);
211
212 /* Set RD or WR bits as appropriate */
213 if (command == NAND_CMD_READID || command == NAND_CMD_STATUS) {
214 ctl1 |= (1<<26); /* rd */
215 /* Always 5 bytes, for now */
216 cafe->datalen = 4;
217 /* And one address cycle -- even for STATUS, since the controller doesn't work without */
218 adrbytes = 1;
219 } else if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
220 command == NAND_CMD_READOOB || command == NAND_CMD_RNDOUT) {
221 ctl1 |= 1<<26; /* rd */
222 /* For now, assume just read to end of page */
223 cafe->datalen = mtd->writesize + mtd->oobsize - column;
224 } else if (command == NAND_CMD_SEQIN)
225 ctl1 |= 1<<25; /* wr */
226
227 /* Set number of address bytes */
228 if (adrbytes)
229 ctl1 |= ((adrbytes-1)|8) << 27;
230
231 if (command == NAND_CMD_SEQIN || command == NAND_CMD_ERASE1) {
232 /* Ignore the first command of a pair; the hardware
233 deals with them both at once, later */
234 cafe->ctl1 = ctl1;
235 cafe_dev_dbg(&cafe->pdev->dev, "Setup for delayed command, ctl1 %08x, dlen %x\n",
236 cafe->ctl1, cafe->datalen);
237 return;
238 }
239 /* RNDOUT and READ0 commands need a following byte */
240 if (command == NAND_CMD_RNDOUT)
241 cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_RNDOUTSTART, NAND_CTRL2);
242 else if (command == NAND_CMD_READ0 && mtd->writesize > 512)
243 cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_READSTART, NAND_CTRL2);
244
245 do_command:
246 cafe_dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
247 cafe->datalen, ctl1, cafe_readl(cafe, NAND_CTRL2));
248
249 /* NB: The datasheet lies -- we really should be subtracting 1 here */
250 cafe_writel(cafe, cafe->datalen, NAND_DATA_LEN);
251 cafe_writel(cafe, 0x90000000, NAND_IRQ);
252 if (usedma && (ctl1 & (3<<25))) {
253 uint32_t dmactl = 0xc0000000 + cafe->datalen;
254 /* If WR or RD bits set, set up DMA */
255 if (ctl1 & (1<<26)) {
256 /* It's a read */
257 dmactl |= (1<<29);
258 /* ... so it's done when the DMA is done, not just
259 the command. */
260 doneint = 0x10000000;
261 }
262 cafe_writel(cafe, dmactl, NAND_DMA_CTRL);
263 }
264 cafe->datalen = 0;
265
266 if (unlikely(regdebug)) {
267 int i;
268 printk("About to write command %08x to register 0\n", ctl1);
269 for (i=4; i< 0x5c; i+=4)
270 printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
271 }
272
273 cafe_writel(cafe, ctl1, NAND_CTRL1);
274 /* Apply this short delay always to ensure that we do wait tWB in
275 * any case on any machine. */
276 ndelay(100);
277
278 if (1) {
279 int c;
280 uint32_t irqs;
281
282 for (c = 500000; c != 0; c--) {
283 irqs = cafe_readl(cafe, NAND_IRQ);
284 if (irqs & doneint)
285 break;
286 udelay(1);
287 if (!(c % 100000))
288 cafe_dev_dbg(&cafe->pdev->dev, "Wait for ready, IRQ %x\n", irqs);
289 cpu_relax();
290 }
291 cafe_writel(cafe, doneint, NAND_IRQ);
292 cafe_dev_dbg(&cafe->pdev->dev, "Command %x completed after %d usec, irqs %x (%x)\n",
293 command, 500000-c, irqs, cafe_readl(cafe, NAND_IRQ));
294 }
295
296 WARN_ON(cafe->ctl2 & (1<<30));
297
298 switch (command) {
299
300 case NAND_CMD_CACHEDPROG:
301 case NAND_CMD_PAGEPROG:
302 case NAND_CMD_ERASE1:
303 case NAND_CMD_ERASE2:
304 case NAND_CMD_SEQIN:
305 case NAND_CMD_RNDIN:
306 case NAND_CMD_STATUS:
307 case NAND_CMD_DEPLETE1:
308 case NAND_CMD_RNDOUT:
309 case NAND_CMD_STATUS_ERROR:
310 case NAND_CMD_STATUS_ERROR0:
311 case NAND_CMD_STATUS_ERROR1:
312 case NAND_CMD_STATUS_ERROR2:
313 case NAND_CMD_STATUS_ERROR3:
314 cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
315 return;
316 }
317 nand_wait_ready(mtd);
318 cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
319 }
320
321 static void cafe_select_chip(struct mtd_info *mtd, int chipnr)
322 {
323 struct cafe_priv *cafe = mtd->priv;
324
325 cafe_dev_dbg(&cafe->pdev->dev, "select_chip %d\n", chipnr);
326
327 /* Mask the appropriate bit into the stored value of ctl1
328 which will be used by cafe_nand_cmdfunc() */
329 if (chipnr)
330 cafe->ctl1 |= CTRL1_CHIPSELECT;
331 else
332 cafe->ctl1 &= ~CTRL1_CHIPSELECT;
333 }
334
335 static int cafe_nand_interrupt(int irq, void *id)
336 {
337 struct mtd_info *mtd = id;
338 struct cafe_priv *cafe = mtd->priv;
339 uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
340 cafe_writel(cafe, irqs & ~0x90000000, NAND_IRQ);
341 if (!irqs)
342 return IRQ_NONE;
343
344 cafe_dev_dbg(&cafe->pdev->dev, "irq, bits %x (%x)\n", irqs, cafe_readl(cafe, NAND_IRQ));
345 return IRQ_HANDLED;
346 }
347
348 static void cafe_nand_bug(struct mtd_info *mtd)
349 {
350 BUG();
351 }
352
353 static int cafe_nand_write_oob(struct mtd_info *mtd,
354 struct nand_chip *chip, int page)
355 {
356 int status = 0;
357
358 chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
359 chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
360 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
361 status = chip->waitfunc(mtd, chip);
362
363 return status & NAND_STATUS_FAIL ? -EIO : 0;
364 }
365
366 /* Don't use -- use nand_read_oob_std for now */
367 static int cafe_nand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
368 int page, int sndcmd)
369 {
370 chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
371 chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
372 return 1;
373 }
374 /**
375 * cafe_nand_read_page_syndrome - {REPLACABLE] hardware ecc syndrom based page read
376 * @mtd: mtd info structure
377 * @chip: nand chip info structure
378 * @buf: buffer to store read data
379 *
380 * The hw generator calculates the error syndrome automatically. Therefor
381 * we need a special oob layout and handling.
382 */
383 static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
384 uint8_t *buf)
385 {
386 struct cafe_priv *cafe = mtd->priv;
387
388 cafe_dev_dbg(&cafe->pdev->dev, "ECC result %08x SYN1,2 %08x\n",
389 cafe_readl(cafe, NAND_ECC_RESULT),
390 cafe_readl(cafe, NAND_ECC_SYN01));
391
392 chip->read_buf(mtd, buf, mtd->writesize);
393 chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
394
395 if (checkecc && cafe_readl(cafe, NAND_ECC_RESULT) & (1<<18)) {
396 unsigned short syn[8], pat[4];
397 int pos[4];
398 u8 *oob = chip->oob_poi;
399 int i, n;
400
401 for (i=0; i<8; i+=2) {
402 uint32_t tmp = cafe_readl(cafe, NAND_ECC_SYN01 + (i*2));
403 syn[i] = cafe->rs->index_of[tmp & 0xfff];
404 syn[i+1] = cafe->rs->index_of[(tmp >> 16) & 0xfff];
405 }
406
407 n = decode_rs16(cafe->rs, NULL, NULL, 1367, syn, 0, pos, 0,
408 pat);
409
410 for (i = 0; i < n; i++) {
411 int p = pos[i];
412
413 /* The 12-bit symbols are mapped to bytes here */
414
415 if (p > 1374) {
416 /* out of range */
417 n = -1374;
418 } else if (p == 0) {
419 /* high four bits do not correspond to data */
420 if (pat[i] > 0xff)
421 n = -2048;
422 else
423 buf[0] ^= pat[i];
424 } else if (p == 1365) {
425 buf[2047] ^= pat[i] >> 4;
426 oob[0] ^= pat[i] << 4;
427 } else if (p > 1365) {
428 if ((p & 1) == 1) {
429 oob[3*p/2 - 2048] ^= pat[i] >> 4;
430 oob[3*p/2 - 2047] ^= pat[i] << 4;
431 } else {
432 oob[3*p/2 - 2049] ^= pat[i] >> 8;
433 oob[3*p/2 - 2048] ^= pat[i];
434 }
435 } else if ((p & 1) == 1) {
436 buf[3*p/2] ^= pat[i] >> 4;
437 buf[3*p/2 + 1] ^= pat[i] << 4;
438 } else {
439 buf[3*p/2 - 1] ^= pat[i] >> 8;
440 buf[3*p/2] ^= pat[i];
441 }
442 }
443
444 if (n < 0) {
445 dev_dbg(&cafe->pdev->dev, "Failed to correct ECC at %08x\n",
446 cafe_readl(cafe, NAND_ADDR2) * 2048);
447 for (i = 0; i < 0x5c; i += 4)
448 printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
449 mtd->ecc_stats.failed++;
450 } else {
451 dev_dbg(&cafe->pdev->dev, "Corrected %d symbol errors\n", n);
452 mtd->ecc_stats.corrected += n;
453 }
454 }
455
456 return 0;
457 }
458
459 static struct nand_ecclayout cafe_oobinfo_2048 = {
460 .eccbytes = 14,
461 .eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
462 .oobfree = {{14, 50}}
463 };
464
465 /* Ick. The BBT code really ought to be able to work this bit out
466 for itself from the above, at least for the 2KiB case */
467 static uint8_t cafe_bbt_pattern_2048[] = { 'B', 'b', 't', '0' };
468 static uint8_t cafe_mirror_pattern_2048[] = { '1', 't', 'b', 'B' };
469
470 static uint8_t cafe_bbt_pattern_512[] = { 0xBB };
471 static uint8_t cafe_mirror_pattern_512[] = { 0xBC };
472
473
474 static struct nand_bbt_descr cafe_bbt_main_descr_2048 = {
475 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
476 | NAND_BBT_2BIT | NAND_BBT_VERSION,
477 .offs = 14,
478 .len = 4,
479 .veroffs = 18,
480 .maxblocks = 4,
481 .pattern = cafe_bbt_pattern_2048
482 };
483
484 static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
485 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
486 | NAND_BBT_2BIT | NAND_BBT_VERSION,
487 .offs = 14,
488 .len = 4,
489 .veroffs = 18,
490 .maxblocks = 4,
491 .pattern = cafe_mirror_pattern_2048
492 };
493
494 static struct nand_ecclayout cafe_oobinfo_512 = {
495 .eccbytes = 14,
496 .eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
497 .oobfree = {{14, 2}}
498 };
499
500 static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
501 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
502 | NAND_BBT_2BIT | NAND_BBT_VERSION,
503 .offs = 14,
504 .len = 1,
505 .veroffs = 15,
506 .maxblocks = 4,
507 .pattern = cafe_bbt_pattern_512
508 };
509
510 static struct nand_bbt_descr cafe_bbt_mirror_descr_512 = {
511 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
512 | NAND_BBT_2BIT | NAND_BBT_VERSION,
513 .offs = 14,
514 .len = 1,
515 .veroffs = 15,
516 .maxblocks = 4,
517 .pattern = cafe_mirror_pattern_512
518 };
519
520
521 static void cafe_nand_write_page_lowlevel(struct mtd_info *mtd,
522 struct nand_chip *chip, const uint8_t *buf)
523 {
524 struct cafe_priv *cafe = mtd->priv;
525
526 chip->write_buf(mtd, buf, mtd->writesize);
527 chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
528
529 /* Set up ECC autogeneration */
530 cafe->ctl2 |= (1<<30);
531 }
532
533 static int cafe_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
534 const uint8_t *buf, int page, int cached, int raw)
535 {
536 int status;
537
538 chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
539
540 if (unlikely(raw))
541 chip->ecc.write_page_raw(mtd, chip, buf);
542 else
543 chip->ecc.write_page(mtd, chip, buf);
544
545 /*
546 * Cached progamming disabled for now, Not sure if its worth the
547 * trouble. The speed gain is not very impressive. (2.3->2.6Mib/s)
548 */
549 cached = 0;
550
551 if (!cached || !(chip->options & NAND_CACHEPRG)) {
552
553 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
554 status = chip->waitfunc(mtd, chip);
555 /*
556 * See if operation failed and additional status checks are
557 * available
558 */
559 if ((status & NAND_STATUS_FAIL) && (chip->errstat))
560 status = chip->errstat(mtd, chip, FL_WRITING, status,
561 page);
562
563 if (status & NAND_STATUS_FAIL)
564 return -EIO;
565 } else {
566 chip->cmdfunc(mtd, NAND_CMD_CACHEDPROG, -1, -1);
567 status = chip->waitfunc(mtd, chip);
568 }
569
570 #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
571 /* Send command to read back the data */
572 chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
573
574 if (chip->verify_buf(mtd, buf, mtd->writesize))
575 return -EIO;
576 #endif
577 return 0;
578 }
579
580 static int cafe_nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
581 {
582 return 0;
583 }
584
585 /* F_2[X]/(X**6+X+1) */
586 static unsigned short __devinit gf64_mul(u8 a, u8 b)
587 {
588 u8 c;
589 unsigned int i;
590
591 c = 0;
592 for (i = 0; i < 6; i++) {
593 if (a & 1)
594 c ^= b;
595 a >>= 1;
596 b <<= 1;
597 if ((b & 0x40) != 0)
598 b ^= 0x43;
599 }
600
601 return c;
602 }
603
604 /* F_64[X]/(X**2+X+A**-1) with A the generator of F_64[X] */
605 static u16 __devinit gf4096_mul(u16 a, u16 b)
606 {
607 u8 ah, al, bh, bl, ch, cl;
608
609 ah = a >> 6;
610 al = a & 0x3f;
611 bh = b >> 6;
612 bl = b & 0x3f;
613
614 ch = gf64_mul(ah ^ al, bh ^ bl) ^ gf64_mul(al, bl);
615 cl = gf64_mul(gf64_mul(ah, bh), 0x21) ^ gf64_mul(al, bl);
616
617 return (ch << 6) ^ cl;
618 }
619
620 static int __devinit cafe_mul(int x)
621 {
622 if (x == 0)
623 return 1;
624 return gf4096_mul(x, 0xe01);
625 }
626
627 static int __devinit cafe_nand_probe(struct pci_dev *pdev,
628 const struct pci_device_id *ent)
629 {
630 struct mtd_info *mtd;
631 struct cafe_priv *cafe;
632 uint32_t ctrl;
633 int err = 0;
634 #ifdef CONFIG_MTD_PARTITIONS
635 struct mtd_partition *parts;
636 int nr_parts;
637 #endif
638
639 /* Very old versions shared the same PCI ident for all three
640 functions on the chip. Verify the class too... */
641 if ((pdev->class >> 8) != PCI_CLASS_MEMORY_FLASH)
642 return -ENODEV;
643
644 err = pci_enable_device(pdev);
645 if (err)
646 return err;
647
648 pci_set_master(pdev);
649
650 mtd = kzalloc(sizeof(*mtd) + sizeof(struct cafe_priv), GFP_KERNEL);
651 if (!mtd) {
652 dev_warn(&pdev->dev, "failed to alloc mtd_info\n");
653 return -ENOMEM;
654 }
655 cafe = (void *)(&mtd[1]);
656
657 mtd->priv = cafe;
658 mtd->owner = THIS_MODULE;
659
660 cafe->pdev = pdev;
661 cafe->mmio = pci_iomap(pdev, 0, 0);
662 if (!cafe->mmio) {
663 dev_warn(&pdev->dev, "failed to iomap\n");
664 err = -ENOMEM;
665 goto out_free_mtd;
666 }
667 cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112 + sizeof(struct nand_buffers),
668 &cafe->dmaaddr, GFP_KERNEL);
669 if (!cafe->dmabuf) {
670 err = -ENOMEM;
671 goto out_ior;
672 }
673 cafe->nand.buffers = (void *)cafe->dmabuf + 2112;
674
675 cafe->rs = init_rs_non_canonical(12, &cafe_mul, 0, 1, 8);
676 if (!cafe->rs) {
677 err = -ENOMEM;
678 goto out_ior;
679 }
680
681 cafe->nand.cmdfunc = cafe_nand_cmdfunc;
682 cafe->nand.dev_ready = cafe_device_ready;
683 cafe->nand.read_byte = cafe_read_byte;
684 cafe->nand.read_buf = cafe_read_buf;
685 cafe->nand.write_buf = cafe_write_buf;
686 cafe->nand.select_chip = cafe_select_chip;
687
688 cafe->nand.chip_delay = 0;
689
690 /* Enable the following for a flash based bad block table */
691 cafe->nand.options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR | NAND_OWN_BUFFERS;
692
693 if (skipbbt) {
694 cafe->nand.options |= NAND_SKIP_BBTSCAN;
695 cafe->nand.block_bad = cafe_nand_block_bad;
696 }
697
698 if (numtimings && numtimings != 3) {
699 dev_warn(&cafe->pdev->dev, "%d timing register values ignored; precisely three are required\n", numtimings);
700 }
701
702 if (numtimings == 3) {
703 cafe_dev_dbg(&cafe->pdev->dev, "Using provided timings (%08x %08x %08x)\n",
704 timing[0], timing[1], timing[2]);
705 } else {
706 timing[0] = cafe_readl(cafe, NAND_TIMING1);
707 timing[1] = cafe_readl(cafe, NAND_TIMING2);
708 timing[2] = cafe_readl(cafe, NAND_TIMING3);
709
710 if (timing[0] | timing[1] | timing[2]) {
711 cafe_dev_dbg(&cafe->pdev->dev, "Timing registers already set (%08x %08x %08x)\n",
712 timing[0], timing[1], timing[2]);
713 } else {
714 dev_warn(&cafe->pdev->dev, "Timing registers unset; using most conservative defaults\n");
715 timing[0] = timing[1] = timing[2] = 0xffffffff;
716 }
717 }
718
719 /* Start off by resetting the NAND controller completely */
720 cafe_writel(cafe, 1, NAND_RESET);
721 cafe_writel(cafe, 0, NAND_RESET);
722
723 cafe_writel(cafe, timing[0], NAND_TIMING1);
724 cafe_writel(cafe, timing[1], NAND_TIMING2);
725 cafe_writel(cafe, timing[2], NAND_TIMING3);
726
727 cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
728 err = request_irq(pdev->irq, &cafe_nand_interrupt, IRQF_SHARED,
729 "CAFE NAND", mtd);
730 if (err) {
731 dev_warn(&pdev->dev, "Could not register IRQ %d\n", pdev->irq);
732 goto out_free_dma;
733 }
734
735 /* Disable master reset, enable NAND clock */
736 ctrl = cafe_readl(cafe, GLOBAL_CTRL);
737 ctrl &= 0xffffeff0;
738 ctrl |= 0x00007000;
739 cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
740 cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
741 cafe_writel(cafe, 0, NAND_DMA_CTRL);
742
743 cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
744 cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
745
746 /* Set up DMA address */
747 cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
748 if (sizeof(cafe->dmaaddr) > 4)
749 /* Shift in two parts to shut the compiler up */
750 cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
751 else
752 cafe_writel(cafe, 0, NAND_DMA_ADDR1);
753
754 cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
755 cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
756
757 /* Enable NAND IRQ in global IRQ mask register */
758 cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
759 cafe_dev_dbg(&cafe->pdev->dev, "Control %x, IRQ mask %x\n",
760 cafe_readl(cafe, GLOBAL_CTRL), cafe_readl(cafe, GLOBAL_IRQ_MASK));
761
762 /* Scan to find existence of the device */
763 if (nand_scan_ident(mtd, 2)) {
764 err = -ENXIO;
765 goto out_irq;
766 }
767
768 cafe->ctl2 = 1<<27; /* Reed-Solomon ECC */
769 if (mtd->writesize == 2048)
770 cafe->ctl2 |= 1<<29; /* 2KiB page size */
771
772 /* Set up ECC according to the type of chip we found */
773 if (mtd->writesize == 2048) {
774 cafe->nand.ecc.layout = &cafe_oobinfo_2048;
775 cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
776 cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
777 } else if (mtd->writesize == 512) {
778 cafe->nand.ecc.layout = &cafe_oobinfo_512;
779 cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
780 cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
781 } else {
782 printk(KERN_WARNING "Unexpected NAND flash writesize %d. Aborting\n",
783 mtd->writesize);
784 goto out_irq;
785 }
786 cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
787 cafe->nand.ecc.size = mtd->writesize;
788 cafe->nand.ecc.bytes = 14;
789 cafe->nand.ecc.hwctl = (void *)cafe_nand_bug;
790 cafe->nand.ecc.calculate = (void *)cafe_nand_bug;
791 cafe->nand.ecc.correct = (void *)cafe_nand_bug;
792 cafe->nand.write_page = cafe_nand_write_page;
793 cafe->nand.ecc.write_page = cafe_nand_write_page_lowlevel;
794 cafe->nand.ecc.write_oob = cafe_nand_write_oob;
795 cafe->nand.ecc.read_page = cafe_nand_read_page;
796 cafe->nand.ecc.read_oob = cafe_nand_read_oob;
797
798 err = nand_scan_tail(mtd);
799 if (err)
800 goto out_irq;
801
802 pci_set_drvdata(pdev, mtd);
803
804 /* We register the whole device first, separate from the partitions */
805 add_mtd_device(mtd);
806
807 #ifdef CONFIG_MTD_PARTITIONS
808 #ifdef CONFIG_MTD_CMDLINE_PARTS
809 mtd->name = "cafe_nand";
810 #endif
811 nr_parts = parse_mtd_partitions(mtd, part_probes, &parts, 0);
812 if (nr_parts > 0) {
813 cafe->parts = parts;
814 dev_info(&cafe->pdev->dev, "%d partitions found\n", nr_parts);
815 add_mtd_partitions(mtd, parts, nr_parts);
816 }
817 #endif
818 goto out;
819
820 out_irq:
821 /* Disable NAND IRQ in global IRQ mask register */
822 cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
823 free_irq(pdev->irq, mtd);
824 out_free_dma:
825 dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
826 out_ior:
827 pci_iounmap(pdev, cafe->mmio);
828 out_free_mtd:
829 kfree(mtd);
830 out:
831 return err;
832 }
833
834 static void __devexit cafe_nand_remove(struct pci_dev *pdev)
835 {
836 struct mtd_info *mtd = pci_get_drvdata(pdev);
837 struct cafe_priv *cafe = mtd->priv;
838
839 del_mtd_device(mtd);
840 /* Disable NAND IRQ in global IRQ mask register */
841 cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
842 free_irq(pdev->irq, mtd);
843 nand_release(mtd);
844 free_rs(cafe->rs);
845 pci_iounmap(pdev, cafe->mmio);
846 dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
847 kfree(mtd);
848 }
849
850 static struct pci_device_id cafe_nand_tbl[] = {
851 { PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_88ALP01_NAND,
852 PCI_ANY_ID, PCI_ANY_ID },
853 { }
854 };
855
856 MODULE_DEVICE_TABLE(pci, cafe_nand_tbl);
857
858 static int cafe_nand_resume(struct pci_dev *pdev)
859 {
860 uint32_t ctrl;
861 struct mtd_info *mtd = pci_get_drvdata(pdev);
862 struct cafe_priv *cafe = mtd->priv;
863
864 /* Start off by resetting the NAND controller completely */
865 cafe_writel(cafe, 1, NAND_RESET);
866 cafe_writel(cafe, 0, NAND_RESET);
867 cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
868
869 /* Restore timing configuration */
870 cafe_writel(cafe, timing[0], NAND_TIMING1);
871 cafe_writel(cafe, timing[1], NAND_TIMING2);
872 cafe_writel(cafe, timing[2], NAND_TIMING3);
873
874 /* Disable master reset, enable NAND clock */
875 ctrl = cafe_readl(cafe, GLOBAL_CTRL);
876 ctrl &= 0xffffeff0;
877 ctrl |= 0x00007000;
878 cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
879 cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
880 cafe_writel(cafe, 0, NAND_DMA_CTRL);
881 cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
882 cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
883
884 /* Set up DMA address */
885 cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
886 if (sizeof(cafe->dmaaddr) > 4)
887 /* Shift in two parts to shut the compiler up */
888 cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
889 else
890 cafe_writel(cafe, 0, NAND_DMA_ADDR1);
891
892 /* Enable NAND IRQ in global IRQ mask register */
893 cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
894 return 0;
895 }
896
897 static struct pci_driver cafe_nand_pci_driver = {
898 .name = "CAFÉ NAND",
899 .id_table = cafe_nand_tbl,
900 .probe = cafe_nand_probe,
901 .remove = __devexit_p(cafe_nand_remove),
902 .resume = cafe_nand_resume,
903 };
904
905 static int cafe_nand_init(void)
906 {
907 return pci_register_driver(&cafe_nand_pci_driver);
908 }
909
910 static void cafe_nand_exit(void)
911 {
912 pci_unregister_driver(&cafe_nand_pci_driver);
913 }
914 module_init(cafe_nand_init);
915 module_exit(cafe_nand_exit);
916
917 MODULE_LICENSE("GPL");
918 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
919 MODULE_DESCRIPTION("NAND flash driver for OLPC CAFÉ chip");
Nao low-level kernelspace/userspace library that runs on our robots, Nao-Team HTWK