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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / mtd / nand / raw / cafe_nand.c
blob2d1c22dc88c15394fe7d1d621f5c32fdd1d937a4
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for One Laptop Per Child ‘CAFÉ’ controller, aka Marvell 88ALP01
4 *
5 * The data sheet for this device can be found at:
6 * http://wiki.laptop.org/go/Datasheets
7 *
8 * Copyright © 2006 Red Hat, Inc.
9 * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
10 */
11
12 #define DEBUG
13
14 #include <linux/device.h>
15 #undef DEBUG
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/rawnand.h>
18 #include <linux/mtd/partitions.h>
19 #include <linux/rslib.h>
20 #include <linux/pci.h>
21 #include <linux/delay.h>
22 #include <linux/interrupt.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <asm/io.h>
27
28 #define CAFE_NAND_CTRL1 0x00
29 #define CAFE_NAND_CTRL2 0x04
30 #define CAFE_NAND_CTRL3 0x08
31 #define CAFE_NAND_STATUS 0x0c
32 #define CAFE_NAND_IRQ 0x10
33 #define CAFE_NAND_IRQ_MASK 0x14
34 #define CAFE_NAND_DATA_LEN 0x18
35 #define CAFE_NAND_ADDR1 0x1c
36 #define CAFE_NAND_ADDR2 0x20
37 #define CAFE_NAND_TIMING1 0x24
38 #define CAFE_NAND_TIMING2 0x28
39 #define CAFE_NAND_TIMING3 0x2c
40 #define CAFE_NAND_NONMEM 0x30
41 #define CAFE_NAND_ECC_RESULT 0x3C
42 #define CAFE_NAND_DMA_CTRL 0x40
43 #define CAFE_NAND_DMA_ADDR0 0x44
44 #define CAFE_NAND_DMA_ADDR1 0x48
45 #define CAFE_NAND_ECC_SYN01 0x50
46 #define CAFE_NAND_ECC_SYN23 0x54
47 #define CAFE_NAND_ECC_SYN45 0x58
48 #define CAFE_NAND_ECC_SYN67 0x5c
49 #define CAFE_NAND_READ_DATA 0x1000
50 #define CAFE_NAND_WRITE_DATA 0x2000
51
52 #define CAFE_GLOBAL_CTRL 0x3004
53 #define CAFE_GLOBAL_IRQ 0x3008
54 #define CAFE_GLOBAL_IRQ_MASK 0x300c
55 #define CAFE_NAND_RESET 0x3034
56
57 /* Missing from the datasheet: bit 19 of CTRL1 sets CE0 vs. CE1 */
58 #define CTRL1_CHIPSELECT (1<<19)
59
60 struct cafe_priv {
61 struct nand_chip nand;
62 struct pci_dev *pdev;
63 void __iomem *mmio;
64 struct rs_control *rs;
65 uint32_t ctl1;
66 uint32_t ctl2;
67 int datalen;
68 int nr_data;
69 int data_pos;
70 int page_addr;
71 bool usedma;
72 dma_addr_t dmaaddr;
73 unsigned char *dmabuf;
74 };
75
76 static int usedma = 1;
77 module_param(usedma, int, 0644);
78
79 static int skipbbt = 0;
80 module_param(skipbbt, int, 0644);
81
82 static int debug = 0;
83 module_param(debug, int, 0644);
84
85 static int regdebug = 0;
86 module_param(regdebug, int, 0644);
87
88 static int checkecc = 1;
89 module_param(checkecc, int, 0644);
90
91 static unsigned int numtimings;
92 static int timing[3];
93 module_param_array(timing, int, &numtimings, 0644);
94
95 static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
96
97 /* Hrm. Why isn't this already conditional on something in the struct device? */
98 #define cafe_dev_dbg(dev, args...) do { if (debug) dev_dbg(dev, ##args); } while(0)
99
100 /* Make it easier to switch to PIO if we need to */
101 #define cafe_readl(cafe, addr) readl((cafe)->mmio + CAFE_##addr)
102 #define cafe_writel(cafe, datum, addr) writel(datum, (cafe)->mmio + CAFE_##addr)
103
104 static int cafe_device_ready(struct nand_chip *chip)
105 {
106 struct cafe_priv *cafe = nand_get_controller_data(chip);
107 int result = !!(cafe_readl(cafe, NAND_STATUS) & 0x40000000);
108 uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
109
110 cafe_writel(cafe, irqs, NAND_IRQ);
111
112 cafe_dev_dbg(&cafe->pdev->dev, "NAND device is%s ready, IRQ %x (%x) (%x,%x)\n",
113 result?"":" not", irqs, cafe_readl(cafe, NAND_IRQ),
114 cafe_readl(cafe, GLOBAL_IRQ), cafe_readl(cafe, GLOBAL_IRQ_MASK));
115
116 return result;
117 }
118
119
120 static void cafe_write_buf(struct nand_chip *chip, const uint8_t *buf, int len)
121 {
122 struct cafe_priv *cafe = nand_get_controller_data(chip);
123
124 if (cafe->usedma)
125 memcpy(cafe->dmabuf + cafe->datalen, buf, len);
126 else
127 memcpy_toio(cafe->mmio + CAFE_NAND_WRITE_DATA + cafe->datalen, buf, len);
128
129 cafe->datalen += len;
130
131 cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes to write buffer. datalen 0x%x\n",
132 len, cafe->datalen);
133 }
134
135 static void cafe_read_buf(struct nand_chip *chip, uint8_t *buf, int len)
136 {
137 struct cafe_priv *cafe = nand_get_controller_data(chip);
138
139 if (cafe->usedma)
140 memcpy(buf, cafe->dmabuf + cafe->datalen, len);
141 else
142 memcpy_fromio(buf, cafe->mmio + CAFE_NAND_READ_DATA + cafe->datalen, len);
143
144 cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes from position 0x%x in read buffer.\n",
145 len, cafe->datalen);
146 cafe->datalen += len;
147 }
148
149 static uint8_t cafe_read_byte(struct nand_chip *chip)
150 {
151 struct cafe_priv *cafe = nand_get_controller_data(chip);
152 uint8_t d;
153
154 cafe_read_buf(chip, &d, 1);
155 cafe_dev_dbg(&cafe->pdev->dev, "Read %02x\n", d);
156
157 return d;
158 }
159
160 static void cafe_nand_cmdfunc(struct nand_chip *chip, unsigned command,
161 int column, int page_addr)
162 {
163 struct mtd_info *mtd = nand_to_mtd(chip);
164 struct cafe_priv *cafe = nand_get_controller_data(chip);
165 int adrbytes = 0;
166 uint32_t ctl1;
167 uint32_t doneint = 0x80000000;
168
169 cafe_dev_dbg(&cafe->pdev->dev, "cmdfunc %02x, 0x%x, 0x%x\n",
170 command, column, page_addr);
171
172 if (command == NAND_CMD_ERASE2 || command == NAND_CMD_PAGEPROG) {
173 /* Second half of a command we already calculated */
174 cafe_writel(cafe, cafe->ctl2 | 0x100 | command, NAND_CTRL2);
175 ctl1 = cafe->ctl1;
176 cafe->ctl2 &= ~(1<<30);
177 cafe_dev_dbg(&cafe->pdev->dev, "Continue command, ctl1 %08x, #data %d\n",
178 cafe->ctl1, cafe->nr_data);
179 goto do_command;
180 }
181 /* Reset ECC engine */
182 cafe_writel(cafe, 0, NAND_CTRL2);
183
184 /* Emulate NAND_CMD_READOOB on large-page chips */
185 if (mtd->writesize > 512 &&
186 command == NAND_CMD_READOOB) {
187 column += mtd->writesize;
188 command = NAND_CMD_READ0;
189 }
190
191 /* FIXME: Do we need to send read command before sending data
192 for small-page chips, to position the buffer correctly? */
193
194 if (column != -1) {
195 cafe_writel(cafe, column, NAND_ADDR1);
196 adrbytes = 2;
197 if (page_addr != -1)
198 goto write_adr2;
199 } else if (page_addr != -1) {
200 cafe_writel(cafe, page_addr & 0xffff, NAND_ADDR1);
201 page_addr >>= 16;
202 write_adr2:
203 cafe_writel(cafe, page_addr, NAND_ADDR2);
204 adrbytes += 2;
205 if (mtd->size > mtd->writesize << 16)
206 adrbytes++;
207 }
208
209 cafe->data_pos = cafe->datalen = 0;
210
211 /* Set command valid bit, mask in the chip select bit */
212 ctl1 = 0x80000000 | command | (cafe->ctl1 & CTRL1_CHIPSELECT);
213
214 /* Set RD or WR bits as appropriate */
215 if (command == NAND_CMD_READID || command == NAND_CMD_STATUS) {
216 ctl1 |= (1<<26); /* rd */
217 /* Always 5 bytes, for now */
218 cafe->datalen = 4;
219 /* And one address cycle -- even for STATUS, since the controller doesn't work without */
220 adrbytes = 1;
221 } else if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
222 command == NAND_CMD_READOOB || command == NAND_CMD_RNDOUT) {
223 ctl1 |= 1<<26; /* rd */
224 /* For now, assume just read to end of page */
225 cafe->datalen = mtd->writesize + mtd->oobsize - column;
226 } else if (command == NAND_CMD_SEQIN)
227 ctl1 |= 1<<25; /* wr */
228
229 /* Set number of address bytes */
230 if (adrbytes)
231 ctl1 |= ((adrbytes-1)|8) << 27;
232
233 if (command == NAND_CMD_SEQIN || command == NAND_CMD_ERASE1) {
234 /* Ignore the first command of a pair; the hardware
235 deals with them both at once, later */
236 cafe->ctl1 = ctl1;
237 cafe_dev_dbg(&cafe->pdev->dev, "Setup for delayed command, ctl1 %08x, dlen %x\n",
238 cafe->ctl1, cafe->datalen);
239 return;
240 }
241 /* RNDOUT and READ0 commands need a following byte */
242 if (command == NAND_CMD_RNDOUT)
243 cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_RNDOUTSTART, NAND_CTRL2);
244 else if (command == NAND_CMD_READ0 && mtd->writesize > 512)
245 cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_READSTART, NAND_CTRL2);
246
247 do_command:
248 cafe_dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
249 cafe->datalen, ctl1, cafe_readl(cafe, NAND_CTRL2));
250
251 /* NB: The datasheet lies -- we really should be subtracting 1 here */
252 cafe_writel(cafe, cafe->datalen, NAND_DATA_LEN);
253 cafe_writel(cafe, 0x90000000, NAND_IRQ);
254 if (cafe->usedma && (ctl1 & (3<<25))) {
255 uint32_t dmactl = 0xc0000000 + cafe->datalen;
256 /* If WR or RD bits set, set up DMA */
257 if (ctl1 & (1<<26)) {
258 /* It's a read */
259 dmactl |= (1<<29);
260 /* ... so it's done when the DMA is done, not just
261 the command. */
262 doneint = 0x10000000;
263 }
264 cafe_writel(cafe, dmactl, NAND_DMA_CTRL);
265 }
266 cafe->datalen = 0;
267
268 if (unlikely(regdebug)) {
269 int i;
270 printk("About to write command %08x to register 0\n", ctl1);
271 for (i=4; i< 0x5c; i+=4)
272 printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
273 }
274
275 cafe_writel(cafe, ctl1, NAND_CTRL1);
276 /* Apply this short delay always to ensure that we do wait tWB in
277 * any case on any machine. */
278 ndelay(100);
279
280 if (1) {
281 int c;
282 uint32_t irqs;
283
284 for (c = 500000; c != 0; c--) {
285 irqs = cafe_readl(cafe, NAND_IRQ);
286 if (irqs & doneint)
287 break;
288 udelay(1);
289 if (!(c % 100000))
290 cafe_dev_dbg(&cafe->pdev->dev, "Wait for ready, IRQ %x\n", irqs);
291 cpu_relax();
292 }
293 cafe_writel(cafe, doneint, NAND_IRQ);
294 cafe_dev_dbg(&cafe->pdev->dev, "Command %x completed after %d usec, irqs %x (%x)\n",
295 command, 500000-c, irqs, cafe_readl(cafe, NAND_IRQ));
296 }
297
298 WARN_ON(cafe->ctl2 & (1<<30));
299
300 switch (command) {
301
302 case NAND_CMD_CACHEDPROG:
303 case NAND_CMD_PAGEPROG:
304 case NAND_CMD_ERASE1:
305 case NAND_CMD_ERASE2:
306 case NAND_CMD_SEQIN:
307 case NAND_CMD_RNDIN:
308 case NAND_CMD_STATUS:
309 case NAND_CMD_RNDOUT:
310 cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
311 return;
312 }
313 nand_wait_ready(chip);
314 cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
315 }
316
317 static void cafe_select_chip(struct nand_chip *chip, int chipnr)
318 {
319 struct cafe_priv *cafe = nand_get_controller_data(chip);
320
321 cafe_dev_dbg(&cafe->pdev->dev, "select_chip %d\n", chipnr);
322
323 /* Mask the appropriate bit into the stored value of ctl1
324 which will be used by cafe_nand_cmdfunc() */
325 if (chipnr)
326 cafe->ctl1 |= CTRL1_CHIPSELECT;
327 else
328 cafe->ctl1 &= ~CTRL1_CHIPSELECT;
329 }
330
331 static irqreturn_t cafe_nand_interrupt(int irq, void *id)
332 {
333 struct mtd_info *mtd = id;
334 struct nand_chip *chip = mtd_to_nand(mtd);
335 struct cafe_priv *cafe = nand_get_controller_data(chip);
336 uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
337 cafe_writel(cafe, irqs & ~0x90000000, NAND_IRQ);
338 if (!irqs)
339 return IRQ_NONE;
340
341 cafe_dev_dbg(&cafe->pdev->dev, "irq, bits %x (%x)\n", irqs, cafe_readl(cafe, NAND_IRQ));
342 return IRQ_HANDLED;
343 }
344
345 static int cafe_nand_write_oob(struct nand_chip *chip, int page)
346 {
347 struct mtd_info *mtd = nand_to_mtd(chip);
348
349 return nand_prog_page_op(chip, page, mtd->writesize, chip->oob_poi,
350 mtd->oobsize);
351 }
352
353 /* Don't use -- use nand_read_oob_std for now */
354 static int cafe_nand_read_oob(struct nand_chip *chip, int page)
355 {
356 struct mtd_info *mtd = nand_to_mtd(chip);
357
358 return nand_read_oob_op(chip, page, 0, chip->oob_poi, mtd->oobsize);
359 }
360 /**
361 * cafe_nand_read_page_syndrome - [REPLACEABLE] hardware ecc syndrome based page read
362 * @mtd: mtd info structure
363 * @chip: nand chip info structure
364 * @buf: buffer to store read data
365 * @oob_required: caller expects OOB data read to chip->oob_poi
366 *
367 * The hw generator calculates the error syndrome automatically. Therefore
368 * we need a special oob layout and handling.
369 */
370 static int cafe_nand_read_page(struct nand_chip *chip, uint8_t *buf,
371 int oob_required, int page)
372 {
373 struct mtd_info *mtd = nand_to_mtd(chip);
374 struct cafe_priv *cafe = nand_get_controller_data(chip);
375 unsigned int max_bitflips = 0;
376
377 cafe_dev_dbg(&cafe->pdev->dev, "ECC result %08x SYN1,2 %08x\n",
378 cafe_readl(cafe, NAND_ECC_RESULT),
379 cafe_readl(cafe, NAND_ECC_SYN01));
380
381 nand_read_page_op(chip, page, 0, buf, mtd->writesize);
382 chip->legacy.read_buf(chip, chip->oob_poi, mtd->oobsize);
383
384 if (checkecc && cafe_readl(cafe, NAND_ECC_RESULT) & (1<<18)) {
385 unsigned short syn[8], pat[4];
386 int pos[4];
387 u8 *oob = chip->oob_poi;
388 int i, n;
389
390 for (i=0; i<8; i+=2) {
391 uint32_t tmp = cafe_readl(cafe, NAND_ECC_SYN01 + (i*2));
392
393 syn[i] = cafe->rs->codec->index_of[tmp & 0xfff];
394 syn[i+1] = cafe->rs->codec->index_of[(tmp >> 16) & 0xfff];
395 }
396
397 n = decode_rs16(cafe->rs, NULL, NULL, 1367, syn, 0, pos, 0,
398 pat);
399
400 for (i = 0; i < n; i++) {
401 int p = pos[i];
402
403 /* The 12-bit symbols are mapped to bytes here */
404
405 if (p > 1374) {
406 /* out of range */
407 n = -1374;
408 } else if (p == 0) {
409 /* high four bits do not correspond to data */
410 if (pat[i] > 0xff)
411 n = -2048;
412 else
413 buf[0] ^= pat[i];
414 } else if (p == 1365) {
415 buf[2047] ^= pat[i] >> 4;
416 oob[0] ^= pat[i] << 4;
417 } else if (p > 1365) {
418 if ((p & 1) == 1) {
419 oob[3*p/2 - 2048] ^= pat[i] >> 4;
420 oob[3*p/2 - 2047] ^= pat[i] << 4;
421 } else {
422 oob[3*p/2 - 2049] ^= pat[i] >> 8;
423 oob[3*p/2 - 2048] ^= pat[i];
424 }
425 } else if ((p & 1) == 1) {
426 buf[3*p/2] ^= pat[i] >> 4;
427 buf[3*p/2 + 1] ^= pat[i] << 4;
428 } else {
429 buf[3*p/2 - 1] ^= pat[i] >> 8;
430 buf[3*p/2] ^= pat[i];
431 }
432 }
433
434 if (n < 0) {
435 dev_dbg(&cafe->pdev->dev, "Failed to correct ECC at %08x\n",
436 cafe_readl(cafe, NAND_ADDR2) * 2048);
437 for (i = 0; i < 0x5c; i += 4)
438 printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
439 mtd->ecc_stats.failed++;
440 } else {
441 dev_dbg(&cafe->pdev->dev, "Corrected %d symbol errors\n", n);
442 mtd->ecc_stats.corrected += n;
443 max_bitflips = max_t(unsigned int, max_bitflips, n);
444 }
445 }
446
447 return max_bitflips;
448 }
449
450 static int cafe_ooblayout_ecc(struct mtd_info *mtd, int section,
451 struct mtd_oob_region *oobregion)
452 {
453 struct nand_chip *chip = mtd_to_nand(mtd);
454
455 if (section)
456 return -ERANGE;
457
458 oobregion->offset = 0;
459 oobregion->length = chip->ecc.total;
460
461 return 0;
462 }
463
464 static int cafe_ooblayout_free(struct mtd_info *mtd, int section,
465 struct mtd_oob_region *oobregion)
466 {
467 struct nand_chip *chip = mtd_to_nand(mtd);
468
469 if (section)
470 return -ERANGE;
471
472 oobregion->offset = chip->ecc.total;
473 oobregion->length = mtd->oobsize - chip->ecc.total;
474
475 return 0;
476 }
477
478 static const struct mtd_ooblayout_ops cafe_ooblayout_ops = {
479 .ecc = cafe_ooblayout_ecc,
480 .free = cafe_ooblayout_free,
481 };
482
483 /* Ick. The BBT code really ought to be able to work this bit out
484 for itself from the above, at least for the 2KiB case */
485 static uint8_t cafe_bbt_pattern_2048[] = { 'B', 'b', 't', '0' };
486 static uint8_t cafe_mirror_pattern_2048[] = { '1', 't', 'b', 'B' };
487
488 static uint8_t cafe_bbt_pattern_512[] = { 0xBB };
489 static uint8_t cafe_mirror_pattern_512[] = { 0xBC };
490
491
492 static struct nand_bbt_descr cafe_bbt_main_descr_2048 = {
493 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
494 | NAND_BBT_2BIT | NAND_BBT_VERSION,
495 .offs = 14,
496 .len = 4,
497 .veroffs = 18,
498 .maxblocks = 4,
499 .pattern = cafe_bbt_pattern_2048
500 };
501
502 static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
503 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
504 | NAND_BBT_2BIT | NAND_BBT_VERSION,
505 .offs = 14,
506 .len = 4,
507 .veroffs = 18,
508 .maxblocks = 4,
509 .pattern = cafe_mirror_pattern_2048
510 };
511
512 static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
513 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
514 | NAND_BBT_2BIT | NAND_BBT_VERSION,
515 .offs = 14,
516 .len = 1,
517 .veroffs = 15,
518 .maxblocks = 4,
519 .pattern = cafe_bbt_pattern_512
520 };
521
522 static struct nand_bbt_descr cafe_bbt_mirror_descr_512 = {
523 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
524 | NAND_BBT_2BIT | NAND_BBT_VERSION,
525 .offs = 14,
526 .len = 1,
527 .veroffs = 15,
528 .maxblocks = 4,
529 .pattern = cafe_mirror_pattern_512
530 };
531
532
533 static int cafe_nand_write_page_lowlevel(struct nand_chip *chip,
534 const uint8_t *buf, int oob_required,
535 int page)
536 {
537 struct mtd_info *mtd = nand_to_mtd(chip);
538 struct cafe_priv *cafe = nand_get_controller_data(chip);
539
540 nand_prog_page_begin_op(chip, page, 0, buf, mtd->writesize);
541 chip->legacy.write_buf(chip, chip->oob_poi, mtd->oobsize);
542
543 /* Set up ECC autogeneration */
544 cafe->ctl2 |= (1<<30);
545
546 return nand_prog_page_end_op(chip);
547 }
548
549 static int cafe_nand_block_bad(struct nand_chip *chip, loff_t ofs)
550 {
551 return 0;
552 }
553
554 /* F_2[X]/(X**6+X+1) */
555 static unsigned short gf64_mul(u8 a, u8 b)
556 {
557 u8 c;
558 unsigned int i;
559
560 c = 0;
561 for (i = 0; i < 6; i++) {
562 if (a & 1)
563 c ^= b;
564 a >>= 1;
565 b <<= 1;
566 if ((b & 0x40) != 0)
567 b ^= 0x43;
568 }
569
570 return c;
571 }
572
573 /* F_64[X]/(X**2+X+A**-1) with A the generator of F_64[X] */
574 static u16 gf4096_mul(u16 a, u16 b)
575 {
576 u8 ah, al, bh, bl, ch, cl;
577
578 ah = a >> 6;
579 al = a & 0x3f;
580 bh = b >> 6;
581 bl = b & 0x3f;
582
583 ch = gf64_mul(ah ^ al, bh ^ bl) ^ gf64_mul(al, bl);
584 cl = gf64_mul(gf64_mul(ah, bh), 0x21) ^ gf64_mul(al, bl);
585
586 return (ch << 6) ^ cl;
587 }
588
589 static int cafe_mul(int x)
590 {
591 if (x == 0)
592 return 1;
593 return gf4096_mul(x, 0xe01);
594 }
595
596 static int cafe_nand_attach_chip(struct nand_chip *chip)
597 {
598 struct mtd_info *mtd = nand_to_mtd(chip);
599 struct cafe_priv *cafe = nand_get_controller_data(chip);
600 int err = 0;
601
602 cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112,
603 &cafe->dmaaddr, GFP_KERNEL);
604 if (!cafe->dmabuf)
605 return -ENOMEM;
606
607 /* Set up DMA address */
608 cafe_writel(cafe, lower_32_bits(cafe->dmaaddr), NAND_DMA_ADDR0);
609 cafe_writel(cafe, upper_32_bits(cafe->dmaaddr), NAND_DMA_ADDR1);
610
611 cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
612 cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
613
614 /* Restore the DMA flag */
615 cafe->usedma = usedma;
616
617 cafe->ctl2 = BIT(27); /* Reed-Solomon ECC */
618 if (mtd->writesize == 2048)
619 cafe->ctl2 |= BIT(29); /* 2KiB page size */
620
621 /* Set up ECC according to the type of chip we found */
622 mtd_set_ooblayout(mtd, &cafe_ooblayout_ops);
623 if (mtd->writesize == 2048) {
624 cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
625 cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
626 } else if (mtd->writesize == 512) {
627 cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
628 cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
629 } else {
630 dev_warn(&cafe->pdev->dev,
631 "Unexpected NAND flash writesize %d. Aborting\n",
632 mtd->writesize);
633 err = -ENOTSUPP;
634 goto out_free_dma;
635 }
636
637 cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
638 cafe->nand.ecc.size = mtd->writesize;
639 cafe->nand.ecc.bytes = 14;
640 cafe->nand.ecc.strength = 4;
641 cafe->nand.ecc.write_page = cafe_nand_write_page_lowlevel;
642 cafe->nand.ecc.write_oob = cafe_nand_write_oob;
643 cafe->nand.ecc.read_page = cafe_nand_read_page;
644 cafe->nand.ecc.read_oob = cafe_nand_read_oob;
645
646 return 0;
647
648 out_free_dma:
649 dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
650
651 return err;
652 }
653
654 static void cafe_nand_detach_chip(struct nand_chip *chip)
655 {
656 struct cafe_priv *cafe = nand_get_controller_data(chip);
657
658 dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
659 }
660
661 static const struct nand_controller_ops cafe_nand_controller_ops = {
662 .attach_chip = cafe_nand_attach_chip,
663 .detach_chip = cafe_nand_detach_chip,
664 };
665
666 static int cafe_nand_probe(struct pci_dev *pdev,
667 const struct pci_device_id *ent)
668 {
669 struct mtd_info *mtd;
670 struct cafe_priv *cafe;
671 uint32_t ctrl;
672 int err = 0;
673
674 /* Very old versions shared the same PCI ident for all three
675 functions on the chip. Verify the class too... */
676 if ((pdev->class >> 8) != PCI_CLASS_MEMORY_FLASH)
677 return -ENODEV;
678
679 err = pci_enable_device(pdev);
680 if (err)
681 return err;
682
683 pci_set_master(pdev);
684
685 cafe = kzalloc(sizeof(*cafe), GFP_KERNEL);
686 if (!cafe)
687 return -ENOMEM;
688
689 mtd = nand_to_mtd(&cafe->nand);
690 mtd->dev.parent = &pdev->dev;
691 nand_set_controller_data(&cafe->nand, cafe);
692
693 cafe->pdev = pdev;
694 cafe->mmio = pci_iomap(pdev, 0, 0);
695 if (!cafe->mmio) {
696 dev_warn(&pdev->dev, "failed to iomap\n");
697 err = -ENOMEM;
698 goto out_free_mtd;
699 }
700
701 cafe->rs = init_rs_non_canonical(12, &cafe_mul, 0, 1, 8);
702 if (!cafe->rs) {
703 err = -ENOMEM;
704 goto out_ior;
705 }
706
707 cafe->nand.legacy.cmdfunc = cafe_nand_cmdfunc;
708 cafe->nand.legacy.dev_ready = cafe_device_ready;
709 cafe->nand.legacy.read_byte = cafe_read_byte;
710 cafe->nand.legacy.read_buf = cafe_read_buf;
711 cafe->nand.legacy.write_buf = cafe_write_buf;
712 cafe->nand.legacy.select_chip = cafe_select_chip;
713 cafe->nand.legacy.set_features = nand_get_set_features_notsupp;
714 cafe->nand.legacy.get_features = nand_get_set_features_notsupp;
715
716 cafe->nand.legacy.chip_delay = 0;
717
718 /* Enable the following for a flash based bad block table */
719 cafe->nand.bbt_options = NAND_BBT_USE_FLASH;
720
721 if (skipbbt) {
722 cafe->nand.options |= NAND_SKIP_BBTSCAN;
723 cafe->nand.legacy.block_bad = cafe_nand_block_bad;
724 }
725
726 if (numtimings && numtimings != 3) {
727 dev_warn(&cafe->pdev->dev, "%d timing register values ignored; precisely three are required\n", numtimings);
728 }
729
730 if (numtimings == 3) {
731 cafe_dev_dbg(&cafe->pdev->dev, "Using provided timings (%08x %08x %08x)\n",
732 timing[0], timing[1], timing[2]);
733 } else {
734 timing[0] = cafe_readl(cafe, NAND_TIMING1);
735 timing[1] = cafe_readl(cafe, NAND_TIMING2);
736 timing[2] = cafe_readl(cafe, NAND_TIMING3);
737
738 if (timing[0] | timing[1] | timing[2]) {
739 cafe_dev_dbg(&cafe->pdev->dev, "Timing registers already set (%08x %08x %08x)\n",
740 timing[0], timing[1], timing[2]);
741 } else {
742 dev_warn(&cafe->pdev->dev, "Timing registers unset; using most conservative defaults\n");
743 timing[0] = timing[1] = timing[2] = 0xffffffff;
744 }
745 }
746
747 /* Start off by resetting the NAND controller completely */
748 cafe_writel(cafe, 1, NAND_RESET);
749 cafe_writel(cafe, 0, NAND_RESET);
750
751 cafe_writel(cafe, timing[0], NAND_TIMING1);
752 cafe_writel(cafe, timing[1], NAND_TIMING2);
753 cafe_writel(cafe, timing[2], NAND_TIMING3);
754
755 cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
756 err = request_irq(pdev->irq, &cafe_nand_interrupt, IRQF_SHARED,
757 "CAFE NAND", mtd);
758 if (err) {
759 dev_warn(&pdev->dev, "Could not register IRQ %d\n", pdev->irq);
760 goto out_ior;
761 }
762
763 /* Disable master reset, enable NAND clock */
764 ctrl = cafe_readl(cafe, GLOBAL_CTRL);
765 ctrl &= 0xffffeff0;
766 ctrl |= 0x00007000;
767 cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
768 cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
769 cafe_writel(cafe, 0, NAND_DMA_CTRL);
770
771 cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
772 cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
773
774 /* Enable NAND IRQ in global IRQ mask register */
775 cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
776 cafe_dev_dbg(&cafe->pdev->dev, "Control %x, IRQ mask %x\n",
777 cafe_readl(cafe, GLOBAL_CTRL),
778 cafe_readl(cafe, GLOBAL_IRQ_MASK));
779
780 /* Do not use the DMA during the NAND identification */
781 cafe->usedma = 0;
782
783 /* Scan to find existence of the device */
784 cafe->nand.legacy.dummy_controller.ops = &cafe_nand_controller_ops;
785 err = nand_scan(&cafe->nand, 2);
786 if (err)
787 goto out_irq;
788
789 pci_set_drvdata(pdev, mtd);
790
791 mtd->name = "cafe_nand";
792 err = mtd_device_parse_register(mtd, part_probes, NULL, NULL, 0);
793 if (err)
794 goto out_cleanup_nand;
795
796 goto out;
797
798 out_cleanup_nand:
799 nand_cleanup(&cafe->nand);
800 out_irq:
801 /* Disable NAND IRQ in global IRQ mask register */
802 cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
803 free_irq(pdev->irq, mtd);
804 out_ior:
805 pci_iounmap(pdev, cafe->mmio);
806 out_free_mtd:
807 kfree(cafe);
808 out:
809 return err;
810 }
811
812 static void cafe_nand_remove(struct pci_dev *pdev)
813 {
814 struct mtd_info *mtd = pci_get_drvdata(pdev);
815 struct nand_chip *chip = mtd_to_nand(mtd);
816 struct cafe_priv *cafe = nand_get_controller_data(chip);
817
818 /* Disable NAND IRQ in global IRQ mask register */
819 cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
820 free_irq(pdev->irq, mtd);
821 nand_release(chip);
822 free_rs(cafe->rs);
823 pci_iounmap(pdev, cafe->mmio);
824 dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
825 kfree(cafe);
826 }
827
828 static const struct pci_device_id cafe_nand_tbl[] = {
829 { PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_88ALP01_NAND,
830 PCI_ANY_ID, PCI_ANY_ID },
831 { }
832 };
833
834 MODULE_DEVICE_TABLE(pci, cafe_nand_tbl);
835
836 static int cafe_nand_resume(struct pci_dev *pdev)
837 {
838 uint32_t ctrl;
839 struct mtd_info *mtd = pci_get_drvdata(pdev);
840 struct nand_chip *chip = mtd_to_nand(mtd);
841 struct cafe_priv *cafe = nand_get_controller_data(chip);
842
843 /* Start off by resetting the NAND controller completely */
844 cafe_writel(cafe, 1, NAND_RESET);
845 cafe_writel(cafe, 0, NAND_RESET);
846 cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
847
848 /* Restore timing configuration */
849 cafe_writel(cafe, timing[0], NAND_TIMING1);
850 cafe_writel(cafe, timing[1], NAND_TIMING2);
851 cafe_writel(cafe, timing[2], NAND_TIMING3);
852
853 /* Disable master reset, enable NAND clock */
854 ctrl = cafe_readl(cafe, GLOBAL_CTRL);
855 ctrl &= 0xffffeff0;
856 ctrl |= 0x00007000;
857 cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
858 cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
859 cafe_writel(cafe, 0, NAND_DMA_CTRL);
860 cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
861 cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
862
863 /* Set up DMA address */
864 cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
865 if (sizeof(cafe->dmaaddr) > 4)
866 /* Shift in two parts to shut the compiler up */
867 cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
868 else
869 cafe_writel(cafe, 0, NAND_DMA_ADDR1);
870
871 /* Enable NAND IRQ in global IRQ mask register */
872 cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
873 return 0;
874 }
875
876 static struct pci_driver cafe_nand_pci_driver = {
877 .name = "CAFÉ NAND",
878 .id_table = cafe_nand_tbl,
879 .probe = cafe_nand_probe,
880 .remove = cafe_nand_remove,
881 .resume = cafe_nand_resume,
882 };
883
884 module_pci_driver(cafe_nand_pci_driver);
885
886 MODULE_LICENSE("GPL");
887 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
888 MODULE_DESCRIPTION("NAND flash driver for OLPC CAFÉ chip");
Linux with added FPC-III support