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Merge tag 'fbdev-for-3.8' of git://gitorious.org/linux-omap-dss2/linux
[deliverable/linux.git] / drivers / mtd / nand / atmel_nand.c
CommitLineData
42cb1403 1/*
1c7b874d 2 * Copyright © 2003 Rick Bronson
42cb1403
AV		 3 *
4 * Derived from drivers/mtd/nand/autcpu12.c
1c7b874d 5 * Copyright © 2001 Thomas Gleixner (gleixner@autronix.de)
42cb1403
AV		 6 *
7 * Derived from drivers/mtd/spia.c
1c7b874d 8 * Copyright © 2000 Steven J. Hill (sjhill@cotw.com)
42cb1403 9 *
77f5492c
RG		 10 *
11 * Add Hardware ECC support for AT91SAM9260 / AT91SAM9263
1c7b874d 12 * Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright © 2007
77f5492c
RG		 13 *
14 * Derived from Das U-Boot source code
15 * (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c)
1c7b874d 16 * © Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
77f5492c 17 *
1c7b874d
JW		 18 * Add Programmable Multibit ECC support for various AT91 SoC
19 * © Copyright 2012 ATMEL, Hong Xu
77f5492c 20 *
42cb1403
AV		 21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License version 2 as
23 * published by the Free Software Foundation.
24 *
25 */
26
b7f080cf 27#include <linux/dma-mapping.h>
42cb1403
AV		 28#include <linux/slab.h>
29#include <linux/module.h>
f4fa697c 30#include <linux/moduleparam.h>
42cb1403 31#include <linux/platform_device.h>
d6a01661
JCPV		 32#include <linux/of.h>
33#include <linux/of_device.h>
34#include <linux/of_gpio.h>
35#include <linux/of_mtd.h>
42cb1403
AV		 36#include <linux/mtd/mtd.h>
37#include <linux/mtd/nand.h>
38#include <linux/mtd/partitions.h>
39
5c39c4c5 40#include <linux/dmaengine.h>
90574d0a
DW		 41#include <linux/gpio.h>
42#include <linux/io.h>
bf4289cb 43#include <linux/platform_data/atmel.h>
251e783a 44#include <linux/pinctrl/consumer.h>
42cb1403 45
a09e64fb 46#include <mach/cpu.h>
42cb1403 47
cbc6c5e7
HX		 48static int use_dma = 1;
49module_param(use_dma, int, 0);
50
f4fa697c
SP		 51static int on_flash_bbt = 0;
52module_param(on_flash_bbt, int, 0);
53
77f5492c
RG		 54/* Register access macros */
55#define ecc_readl(add, reg) \
3c3796cc 56 __raw_readl(add + ATMEL_ECC_##reg)
77f5492c 57#define ecc_writel(add, reg, value) \
3c3796cc 58 __raw_writel((value), add + ATMEL_ECC_##reg)
77f5492c 59
d4f4c0aa 60#include "atmel_nand_ecc.h" /* Hardware ECC registers */
77f5492c
RG		 61
62/* oob layout for large page size
63 * bad block info is on bytes 0 and 1
64 * the bytes have to be consecutives to avoid
65 * several NAND_CMD_RNDOUT during read
66 */
3c3796cc 67static struct nand_ecclayout atmel_oobinfo_large = {
77f5492c
RG		 68 .eccbytes = 4,
69 .eccpos = {60, 61, 62, 63},
70 .oobfree = {
71 {2, 58}
72 },
73};
74
75/* oob layout for small page size
76 * bad block info is on bytes 4 and 5
77 * the bytes have to be consecutives to avoid
78 * several NAND_CMD_RNDOUT during read
79 */
3c3796cc 80static struct nand_ecclayout atmel_oobinfo_small = {
77f5492c
RG		 81 .eccbytes = 4,
82 .eccpos = {0, 1, 2, 3},
83 .oobfree = {
84 {6, 10}
85 },
86};
87
3c3796cc 88struct atmel_nand_host {
42cb1403
AV		 89 struct nand_chip nand_chip;
90 struct mtd_info mtd;
91 void __iomem *io_base;
cbc6c5e7 92 dma_addr_t io_phys;
d6a01661 93 struct atmel_nand_data board;
77f5492c
RG		 94 struct device *dev;
95 void __iomem *ecc;
cbc6c5e7
HX		 96
97 struct completion comp;
98 struct dma_chan *dma_chan;
a41b51a1
JW		 99
100 bool has_pmecc;
101 u8 pmecc_corr_cap;
102 u16 pmecc_sector_size;
103 u32 pmecc_lookup_table_offset;
1c7b874d
JW		 104
105 int pmecc_bytes_per_sector;
106 int pmecc_sector_number;
107 int pmecc_degree; /* Degree of remainders */
108 int pmecc_cw_len; /* Length of codeword */
109
110 void __iomem *pmerrloc_base;
111 void __iomem *pmecc_rom_base;
112
113 /* lookup table for alpha_to and index_of */
114 void __iomem *pmecc_alpha_to;
115 void __iomem *pmecc_index_of;
116
117 /* data for pmecc computation */
118 int16_t *pmecc_partial_syn;
119 int16_t *pmecc_si;
120 int16_t *pmecc_smu; /* Sigma table */
121 int16_t *pmecc_lmu; /* polynomal order */
122 int *pmecc_mu;
123 int *pmecc_dmu;
124 int *pmecc_delta;
42cb1403
AV		 125};
126
1c7b874d
JW		 127static struct nand_ecclayout atmel_pmecc_oobinfo;
128
cbc6c5e7
HX		 129static int cpu_has_dma(void)
130{
131 return cpu_is_at91sam9rl() || cpu_is_at91sam9g45();
132}
133
8136508c
AN		 134/*
135 * Enable NAND.
136 */
3c3796cc 137static void atmel_nand_enable(struct atmel_nand_host *host)
8136508c 138{
d6a01661
JCPV		 139 if (gpio_is_valid(host->board.enable_pin))
140 gpio_set_value(host->board.enable_pin, 0);
8136508c
AN		 141}
142
143/*
144 * Disable NAND.
145 */
3c3796cc 146static void atmel_nand_disable(struct atmel_nand_host *host)
8136508c 147{
d6a01661
JCPV		 148 if (gpio_is_valid(host->board.enable_pin))
149 gpio_set_value(host->board.enable_pin, 1);
8136508c
AN		 150}
151
42cb1403
AV		 152/*
153 * Hardware specific access to control-lines
154 */
3c3796cc 155static void atmel_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
42cb1403
AV		 156{
157 struct nand_chip *nand_chip = mtd->priv;
3c3796cc 158 struct atmel_nand_host *host = nand_chip->priv;
42cb1403 159
8136508c 160 if (ctrl & NAND_CTRL_CHANGE) {
2314488e 161 if (ctrl & NAND_NCE)
3c3796cc 162 atmel_nand_enable(host);
2314488e 163 else
3c3796cc 164 atmel_nand_disable(host);
2314488e 165 }
42cb1403
AV		 166 if (cmd == NAND_CMD_NONE)
167 return;
168
169 if (ctrl & NAND_CLE)
d6a01661 170 writeb(cmd, host->io_base + (1 << host->board.cle));
42cb1403 171 else
d6a01661 172 writeb(cmd, host->io_base + (1 << host->board.ale));
42cb1403
AV		 173}
174
175/*
176 * Read the Device Ready pin.
177 */
3c3796cc 178static int atmel_nand_device_ready(struct mtd_info *mtd)
42cb1403
AV		 179{
180 struct nand_chip *nand_chip = mtd->priv;
3c3796cc 181 struct atmel_nand_host *host = nand_chip->priv;
42cb1403 182
d6a01661
JCPV		 183 return gpio_get_value(host->board.rdy_pin) ^
184 !!host->board.rdy_pin_active_low;
42cb1403
AV		 185}
186
50082319
AB		 187/*
188 * Minimal-overhead PIO for data access.
189 */
190static void atmel_read_buf8(struct mtd_info *mtd, u8 *buf, int len)
191{
192 struct nand_chip *nand_chip = mtd->priv;
193
194 __raw_readsb(nand_chip->IO_ADDR_R, buf, len);
195}
196
197static void atmel_read_buf16(struct mtd_info *mtd, u8 *buf, int len)
198{
199 struct nand_chip *nand_chip = mtd->priv;
200
201 __raw_readsw(nand_chip->IO_ADDR_R, buf, len / 2);
202}
203
204static void atmel_write_buf8(struct mtd_info *mtd, const u8 *buf, int len)
205{
206 struct nand_chip *nand_chip = mtd->priv;
207
208 __raw_writesb(nand_chip->IO_ADDR_W, buf, len);
209}
210
211static void atmel_write_buf16(struct mtd_info *mtd, const u8 *buf, int len)
212{
213 struct nand_chip *nand_chip = mtd->priv;
214
215 __raw_writesw(nand_chip->IO_ADDR_W, buf, len / 2);
216}
217
cbc6c5e7
HX		 218static void dma_complete_func(void *completion)
219{
220 complete(completion);
221}
222
223static int atmel_nand_dma_op(struct mtd_info *mtd, void *buf, int len,
224 int is_read)
225{
226 struct dma_device *dma_dev;
227 enum dma_ctrl_flags flags;
228 dma_addr_t dma_src_addr, dma_dst_addr, phys_addr;
229 struct dma_async_tx_descriptor *tx = NULL;
230 dma_cookie_t cookie;
231 struct nand_chip *chip = mtd->priv;
232 struct atmel_nand_host *host = chip->priv;
233 void *p = buf;
234 int err = -EIO;
235 enum dma_data_direction dir = is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
236
80b4f81a
HX		 237 if (buf >= high_memory)
238 goto err_buf;
cbc6c5e7
HX		 239
240 dma_dev = host->dma_chan->device;
241
242 flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP |
243 DMA_COMPL_SKIP_DEST_UNMAP;
244
245 phys_addr = dma_map_single(dma_dev->dev, p, len, dir);
246 if (dma_mapping_error(dma_dev->dev, phys_addr)) {
247 dev_err(host->dev, "Failed to dma_map_single\n");
248 goto err_buf;
249 }
250
251 if (is_read) {
252 dma_src_addr = host->io_phys;
253 dma_dst_addr = phys_addr;
254 } else {
255 dma_src_addr = phys_addr;
256 dma_dst_addr = host->io_phys;
257 }
258
259 tx = dma_dev->device_prep_dma_memcpy(host->dma_chan, dma_dst_addr,
260 dma_src_addr, len, flags);
261 if (!tx) {
262 dev_err(host->dev, "Failed to prepare DMA memcpy\n");
263 goto err_dma;
264 }
265
266 init_completion(&host->comp);
267 tx->callback = dma_complete_func;
268 tx->callback_param = &host->comp;
269
270 cookie = tx->tx_submit(tx);
271 if (dma_submit_error(cookie)) {
272 dev_err(host->dev, "Failed to do DMA tx_submit\n");
273 goto err_dma;
274 }
275
276 dma_async_issue_pending(host->dma_chan);
277 wait_for_completion(&host->comp);
278
279 err = 0;
280
281err_dma:
282 dma_unmap_single(dma_dev->dev, phys_addr, len, dir);
283err_buf:
284 if (err != 0)
285 dev_warn(host->dev, "Fall back to CPU I/O\n");
286 return err;
287}
288
289static void atmel_read_buf(struct mtd_info *mtd, u8 *buf, int len)
290{
291 struct nand_chip *chip = mtd->priv;
50082319 292 struct atmel_nand_host *host = chip->priv;
cbc6c5e7 293
9d51567e
NF		 294 if (use_dma && len > mtd->oobsize)
295 /* only use DMA for bigger than oob size: better performances */
cbc6c5e7
HX		 296 if (atmel_nand_dma_op(mtd, buf, len, 1) == 0)
297 return;
298
d6a01661 299 if (host->board.bus_width_16)
50082319
AB		 300 atmel_read_buf16(mtd, buf, len);
301 else
302 atmel_read_buf8(mtd, buf, len);
cbc6c5e7
HX		 303}
304
305static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
306{
307 struct nand_chip *chip = mtd->priv;
50082319 308 struct atmel_nand_host *host = chip->priv;
cbc6c5e7 309
9d51567e
NF		 310 if (use_dma && len > mtd->oobsize)
311 /* only use DMA for bigger than oob size: better performances */
cbc6c5e7
HX		 312 if (atmel_nand_dma_op(mtd, (void *)buf, len, 0) == 0)
313 return;
314
d6a01661 315 if (host->board.bus_width_16)
50082319
AB		 316 atmel_write_buf16(mtd, buf, len);
317 else
318 atmel_write_buf8(mtd, buf, len);
cbc6c5e7
HX		 319}
320
1c7b874d
JW		 321/*
322 * Return number of ecc bytes per sector according to sector size and
323 * correction capability
324 *
325 * Following table shows what at91 PMECC supported:
326 * Correction Capability Sector_512_bytes Sector_1024_bytes
327 * ===================== ================ =================
328 * 2-bits 4-bytes 4-bytes
329 * 4-bits 7-bytes 7-bytes
330 * 8-bits 13-bytes 14-bytes
331 * 12-bits 20-bytes 21-bytes
332 * 24-bits 39-bytes 42-bytes
333 */
334static int __devinit pmecc_get_ecc_bytes(int cap, int sector_size)
335{
336 int m = 12 + sector_size / 512;
337 return (m * cap + 7) / 8;
338}
339
340static void __devinit pmecc_config_ecc_layout(struct nand_ecclayout *layout,
341 int oobsize, int ecc_len)
342{
343 int i;
344
345 layout->eccbytes = ecc_len;
346
347 /* ECC will occupy the last ecc_len bytes continuously */
348 for (i = 0; i < ecc_len; i++)
349 layout->eccpos[i] = oobsize - ecc_len + i;
350
351 layout->oobfree[0].offset = 2;
352 layout->oobfree[0].length =
353 oobsize - ecc_len - layout->oobfree[0].offset;
354}
355
356static void __devinit __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
357{
358 int table_size;
359
360 table_size = host->pmecc_sector_size == 512 ?
361 PMECC_LOOKUP_TABLE_SIZE_512 : PMECC_LOOKUP_TABLE_SIZE_1024;
362
363 return host->pmecc_rom_base + host->pmecc_lookup_table_offset +
364 table_size * sizeof(int16_t);
365}
366
367static void pmecc_data_free(struct atmel_nand_host *host)
368{
369 kfree(host->pmecc_partial_syn);
370 kfree(host->pmecc_si);
371 kfree(host->pmecc_lmu);
372 kfree(host->pmecc_smu);
373 kfree(host->pmecc_mu);
374 kfree(host->pmecc_dmu);
375 kfree(host->pmecc_delta);
376}
377
378static int __devinit pmecc_data_alloc(struct atmel_nand_host *host)
379{
380 const int cap = host->pmecc_corr_cap;
381
382 host->pmecc_partial_syn = kzalloc((2 * cap + 1) * sizeof(int16_t),
383 GFP_KERNEL);
384 host->pmecc_si = kzalloc((2 * cap + 1) * sizeof(int16_t), GFP_KERNEL);
385 host->pmecc_lmu = kzalloc((cap + 1) * sizeof(int16_t), GFP_KERNEL);
386 host->pmecc_smu = kzalloc((cap + 2) * (2 * cap + 1) * sizeof(int16_t),
387 GFP_KERNEL);
388 host->pmecc_mu = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL);
389 host->pmecc_dmu = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL);
390 host->pmecc_delta = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL);
391
392 if (host->pmecc_partial_syn &&
393 host->pmecc_si &&
394 host->pmecc_lmu &&
395 host->pmecc_smu &&
396 host->pmecc_mu &&
397 host->pmecc_dmu &&
398 host->pmecc_delta)
399 return 0;
400
401 /* error happened */
402 pmecc_data_free(host);
403 return -ENOMEM;
404}
405
406static void pmecc_gen_syndrome(struct mtd_info *mtd, int sector)
407{
408 struct nand_chip *nand_chip = mtd->priv;
409 struct atmel_nand_host *host = nand_chip->priv;
410 int i;
411 uint32_t value;
412
413 /* Fill odd syndromes */
414 for (i = 0; i < host->pmecc_corr_cap; i++) {
415 value = pmecc_readl_rem_relaxed(host->ecc, sector, i / 2);
416 if (i & 1)
417 value >>= 16;
418 value &= 0xffff;
419 host->pmecc_partial_syn[(2 * i) + 1] = (int16_t)value;
420 }
421}
422
423static void pmecc_substitute(struct mtd_info *mtd)
424{
425 struct nand_chip *nand_chip = mtd->priv;
426 struct atmel_nand_host *host = nand_chip->priv;
427 int16_t __iomem *alpha_to = host->pmecc_alpha_to;
428 int16_t __iomem *index_of = host->pmecc_index_of;
429 int16_t *partial_syn = host->pmecc_partial_syn;
430 const int cap = host->pmecc_corr_cap;
431 int16_t *si;
432 int i, j;
433
434 /* si[] is a table that holds the current syndrome value,
435 * an element of that table belongs to the field
436 */
437 si = host->pmecc_si;
438
439 memset(&si[1], 0, sizeof(int16_t) * (2 * cap - 1));
440
441 /* Computation 2t syndromes based on S(x) */
442 /* Odd syndromes */
443 for (i = 1; i < 2 * cap; i += 2) {
444 for (j = 0; j < host->pmecc_degree; j++) {
445 if (partial_syn[i] & ((unsigned short)0x1 << j))
446 si[i] = readw_relaxed(alpha_to + i * j) ^ si[i];
447 }
448 }
449 /* Even syndrome = (Odd syndrome) ** 2 */
450 for (i = 2, j = 1; j <= cap; i = ++j << 1) {
451 if (si[j] == 0) {
452 si[i] = 0;
453 } else {
454 int16_t tmp;
455
456 tmp = readw_relaxed(index_of + si[j]);
457 tmp = (tmp * 2) % host->pmecc_cw_len;
458 si[i] = readw_relaxed(alpha_to + tmp);
459 }
460 }
461
462 return;
463}
464
465static void pmecc_get_sigma(struct mtd_info *mtd)
466{
467 struct nand_chip *nand_chip = mtd->priv;
468 struct atmel_nand_host *host = nand_chip->priv;
469
470 int16_t *lmu = host->pmecc_lmu;
471 int16_t *si = host->pmecc_si;
472 int *mu = host->pmecc_mu;
473 int *dmu = host->pmecc_dmu; /* Discrepancy */
474 int *delta = host->pmecc_delta; /* Delta order */
475 int cw_len = host->pmecc_cw_len;
476 const int16_t cap = host->pmecc_corr_cap;
477 const int num = 2 * cap + 1;
478 int16_t __iomem *index_of = host->pmecc_index_of;
479 int16_t __iomem *alpha_to = host->pmecc_alpha_to;
480 int i, j, k;
481 uint32_t dmu_0_count, tmp;
482 int16_t *smu = host->pmecc_smu;
483
484 /* index of largest delta */
485 int ro;
486 int largest;
487 int diff;
488
489 dmu_0_count = 0;
490
491 /* First Row */
492
493 /* Mu */
494 mu[0] = -1;
495
496 memset(smu, 0, sizeof(int16_t) * num);
497 smu[0] = 1;
498
499 /* discrepancy set to 1 */
500 dmu[0] = 1;
501 /* polynom order set to 0 */
502 lmu[0] = 0;
503 delta[0] = (mu[0] * 2 - lmu[0]) >> 1;
504
505 /* Second Row */
506
507 /* Mu */
508 mu[1] = 0;
509 /* Sigma(x) set to 1 */
510 memset(&smu[num], 0, sizeof(int16_t) * num);
511 smu[num] = 1;
512
513 /* discrepancy set to S1 */
514 dmu[1] = si[1];
515
516 /* polynom order set to 0 */
517 lmu[1] = 0;
518
519 delta[1] = (mu[1] * 2 - lmu[1]) >> 1;
520
521 /* Init the Sigma(x) last row */
522 memset(&smu[(cap + 1) * num], 0, sizeof(int16_t) * num);
523
524 for (i = 1; i <= cap; i++) {
525 mu[i + 1] = i << 1;
526 /* Begin Computing Sigma (Mu+1) and L(mu) */
527 /* check if discrepancy is set to 0 */
528 if (dmu[i] == 0) {
529 dmu_0_count++;
530
531 tmp = ((cap - (lmu[i] >> 1) - 1) / 2);
532 if ((cap - (lmu[i] >> 1) - 1) & 0x1)
533 tmp += 2;
534 else
535 tmp += 1;
536
537 if (dmu_0_count == tmp) {
538 for (j = 0; j <= (lmu[i] >> 1) + 1; j++)
539 smu[(cap + 1) * num + j] =
540 smu[i * num + j];
541
542 lmu[cap + 1] = lmu[i];
543 return;
544 }
545
546 /* copy polynom */
547 for (j = 0; j <= lmu[i] >> 1; j++)
548 smu[(i + 1) * num + j] = smu[i * num + j];
549
550 /* copy previous polynom order to the next */
551 lmu[i + 1] = lmu[i];
552 } else {
553 ro = 0;
554 largest = -1;
555 /* find largest delta with dmu != 0 */
556 for (j = 0; j < i; j++) {
557 if ((dmu[j]) && (delta[j] > largest)) {
558 largest = delta[j];
559 ro = j;
560 }
561 }
562
563 /* compute difference */
564 diff = (mu[i] - mu[ro]);
565
566 /* Compute degree of the new smu polynomial */
567 if ((lmu[i] >> 1) > ((lmu[ro] >> 1) + diff))
568 lmu[i + 1] = lmu[i];
569 else
570 lmu[i + 1] = ((lmu[ro] >> 1) + diff) * 2;
571
572 /* Init smu[i+1] with 0 */
573 for (k = 0; k < num; k++)
574 smu[(i + 1) * num + k] = 0;
575
576 /* Compute smu[i+1] */
577 for (k = 0; k <= lmu[ro] >> 1; k++) {
578 int16_t a, b, c;
579
580 if (!(smu[ro * num + k] && dmu[i]))
581 continue;
582 a = readw_relaxed(index_of + dmu[i]);
583 b = readw_relaxed(index_of + dmu[ro]);
584 c = readw_relaxed(index_of + smu[ro * num + k]);
585 tmp = a + (cw_len - b) + c;
586 a = readw_relaxed(alpha_to + tmp % cw_len);
587 smu[(i + 1) * num + (k + diff)] = a;
588 }
589
590 for (k = 0; k <= lmu[i] >> 1; k++)
591 smu[(i + 1) * num + k] ^= smu[i * num + k];
592 }
593
594 /* End Computing Sigma (Mu+1) and L(mu) */
595 /* In either case compute delta */
596 delta[i + 1] = (mu[i + 1] * 2 - lmu[i + 1]) >> 1;
597
598 /* Do not compute discrepancy for the last iteration */
599 if (i >= cap)
600 continue;
601
602 for (k = 0; k <= (lmu[i + 1] >> 1); k++) {
603 tmp = 2 * (i - 1);
604 if (k == 0) {
605 dmu[i + 1] = si[tmp + 3];
606 } else if (smu[(i + 1) * num + k] && si[tmp + 3 - k]) {
607 int16_t a, b, c;
608 a = readw_relaxed(index_of +
609 smu[(i + 1) * num + k]);
610 b = si[2 * (i - 1) + 3 - k];
611 c = readw_relaxed(index_of + b);
612 tmp = a + c;
613 tmp %= cw_len;
614 dmu[i + 1] = readw_relaxed(alpha_to + tmp) ^
615 dmu[i + 1];
616 }
617 }
618 }
619
620 return;
621}
622
623static int pmecc_err_location(struct mtd_info *mtd)
624{
625 struct nand_chip *nand_chip = mtd->priv;
626 struct atmel_nand_host *host = nand_chip->priv;
627 unsigned long end_time;
628 const int cap = host->pmecc_corr_cap;
629 const int num = 2 * cap + 1;
630 int sector_size = host->pmecc_sector_size;
631 int err_nbr = 0; /* number of error */
632 int roots_nbr; /* number of roots */
633 int i;
634 uint32_t val;
635 int16_t *smu = host->pmecc_smu;
636
637 pmerrloc_writel(host->pmerrloc_base, ELDIS, PMERRLOC_DISABLE);
638
639 for (i = 0; i <= host->pmecc_lmu[cap + 1] >> 1; i++) {
640 pmerrloc_writel_sigma_relaxed(host->pmerrloc_base, i,
641 smu[(cap + 1) * num + i]);
642 err_nbr++;
643 }
644
645 val = (err_nbr - 1) << 16;
646 if (sector_size == 1024)
647 val |= 1;
648
649 pmerrloc_writel(host->pmerrloc_base, ELCFG, val);
650 pmerrloc_writel(host->pmerrloc_base, ELEN,
651 sector_size * 8 + host->pmecc_degree * cap);
652
653 end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS);
654 while (!(pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR)
655 & PMERRLOC_CALC_DONE)) {
656 if (unlikely(time_after(jiffies, end_time))) {
657 dev_err(host->dev, "PMECC: Timeout to calculate error location.\n");
658 return -1;
659 }
660 cpu_relax();
661 }
662
663 roots_nbr = (pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR)
664 & PMERRLOC_ERR_NUM_MASK) >> 8;
665 /* Number of roots == degree of smu hence <= cap */
666 if (roots_nbr == host->pmecc_lmu[cap + 1] >> 1)
667 return err_nbr - 1;
668
669 /* Number of roots does not match the degree of smu
670 * unable to correct error */
671 return -1;
672}
673
674static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
675 int sector_num, int extra_bytes, int err_nbr)
676{
677 struct nand_chip *nand_chip = mtd->priv;
678 struct atmel_nand_host *host = nand_chip->priv;
679 int i = 0;
680 int byte_pos, bit_pos, sector_size, pos;
681 uint32_t tmp;
682 uint8_t err_byte;
683
684 sector_size = host->pmecc_sector_size;
685
686 while (err_nbr) {
687 tmp = pmerrloc_readl_el_relaxed(host->pmerrloc_base, i) - 1;
688 byte_pos = tmp / 8;
689 bit_pos = tmp % 8;
690
691 if (byte_pos >= (sector_size + extra_bytes))
692 BUG(); /* should never happen */
693
694 if (byte_pos < sector_size) {
695 err_byte = *(buf + byte_pos);
696 *(buf + byte_pos) ^= (1 << bit_pos);
697
698 pos = sector_num * host->pmecc_sector_size + byte_pos;
699 dev_info(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
700 pos, bit_pos, err_byte, *(buf + byte_pos));
701 } else {
702 /* Bit flip in OOB area */
703 tmp = sector_num * host->pmecc_bytes_per_sector
704 + (byte_pos - sector_size);
705 err_byte = ecc[tmp];
706 ecc[tmp] ^= (1 << bit_pos);
707
708 pos = tmp + nand_chip->ecc.layout->eccpos[0];
709 dev_info(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
710 pos, bit_pos, err_byte, ecc[tmp]);
711 }
712
713 i++;
714 err_nbr--;
715 }
716
717 return;
718}
719
720static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf,
721 u8 *ecc)
722{
723 struct nand_chip *nand_chip = mtd->priv;
724 struct atmel_nand_host *host = nand_chip->priv;
725 int i, err_nbr, eccbytes;
726 uint8_t *buf_pos;
727
728 eccbytes = nand_chip->ecc.bytes;
729 for (i = 0; i < eccbytes; i++)
730 if (ecc[i] != 0xff)
731 goto normal_check;
732 /* Erased page, return OK */
733 return 0;
734
735normal_check:
736 for (i = 0; i < host->pmecc_sector_number; i++) {
737 err_nbr = 0;
738 if (pmecc_stat & 0x1) {
739 buf_pos = buf + i * host->pmecc_sector_size;
740
741 pmecc_gen_syndrome(mtd, i);
742 pmecc_substitute(mtd);
743 pmecc_get_sigma(mtd);
744
745 err_nbr = pmecc_err_location(mtd);
746 if (err_nbr == -1) {
747 dev_err(host->dev, "PMECC: Too many errors\n");
748 mtd->ecc_stats.failed++;
749 return -EIO;
750 } else {
751 pmecc_correct_data(mtd, buf_pos, ecc, i,
752 host->pmecc_bytes_per_sector, err_nbr);
753 mtd->ecc_stats.corrected += err_nbr;
754 }
755 }
756 pmecc_stat >>= 1;
757 }
758
759 return 0;
760}
761
762static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
763 struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
764{
765 struct atmel_nand_host *host = chip->priv;
766 int eccsize = chip->ecc.size;
767 uint8_t *oob = chip->oob_poi;
768 uint32_t *eccpos = chip->ecc.layout->eccpos;
769 uint32_t stat;
770 unsigned long end_time;
771
772 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
773 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
774 pmecc_writel(host->ecc, CFG, (pmecc_readl_relaxed(host->ecc, CFG)
775 & ~PMECC_CFG_WRITE_OP) | PMECC_CFG_AUTO_ENABLE);
776
777 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
778 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DATA);
779
780 chip->read_buf(mtd, buf, eccsize);
781 chip->read_buf(mtd, oob, mtd->oobsize);
782
783 end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS);
784 while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) {
785 if (unlikely(time_after(jiffies, end_time))) {
786 dev_err(host->dev, "PMECC: Timeout to get error status.\n");
787 return -EIO;
788 }
789 cpu_relax();
790 }
791
792 stat = pmecc_readl_relaxed(host->ecc, ISR);
793 if (stat != 0)
794 if (pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]) != 0)
795 return -EIO;
796
797 return 0;
798}
799
800static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
801 struct nand_chip *chip, const uint8_t *buf, int oob_required)
802{
803 struct atmel_nand_host *host = chip->priv;
804 uint32_t *eccpos = chip->ecc.layout->eccpos;
805 int i, j;
806 unsigned long end_time;
807
808 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
809 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
810
811 pmecc_writel(host->ecc, CFG, (pmecc_readl_relaxed(host->ecc, CFG) |
812 PMECC_CFG_WRITE_OP) & ~PMECC_CFG_AUTO_ENABLE);
813
814 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
815 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DATA);
816
817 chip->write_buf(mtd, (u8 *)buf, mtd->writesize);
818
819 end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS);
820 while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) {
821 if (unlikely(time_after(jiffies, end_time))) {
822 dev_err(host->dev, "PMECC: Timeout to get ECC value.\n");
823 return -EIO;
824 }
825 cpu_relax();
826 }
827
828 for (i = 0; i < host->pmecc_sector_number; i++) {
829 for (j = 0; j < host->pmecc_bytes_per_sector; j++) {
830 int pos;
831
832 pos = i * host->pmecc_bytes_per_sector + j;
833 chip->oob_poi[eccpos[pos]] =
834 pmecc_readb_ecc_relaxed(host->ecc, i, j);
835 }
836 }
837 chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
838
839 return 0;
840}
841
842static void atmel_pmecc_core_init(struct mtd_info *mtd)
843{
844 struct nand_chip *nand_chip = mtd->priv;
845 struct atmel_nand_host *host = nand_chip->priv;
846 uint32_t val = 0;
847 struct nand_ecclayout *ecc_layout;
848
849 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
850 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
851
852 switch (host->pmecc_corr_cap) {
853 case 2:
854 val = PMECC_CFG_BCH_ERR2;
855 break;
856 case 4:
857 val = PMECC_CFG_BCH_ERR4;
858 break;
859 case 8:
860 val = PMECC_CFG_BCH_ERR8;
861 break;
862 case 12:
863 val = PMECC_CFG_BCH_ERR12;
864 break;
865 case 24:
866 val = PMECC_CFG_BCH_ERR24;
867 break;
868 }
869
870 if (host->pmecc_sector_size == 512)
871 val |= PMECC_CFG_SECTOR512;
872 else if (host->pmecc_sector_size == 1024)
873 val |= PMECC_CFG_SECTOR1024;
874
875 switch (host->pmecc_sector_number) {
876 case 1:
877 val |= PMECC_CFG_PAGE_1SECTOR;
878 break;
879 case 2:
880 val |= PMECC_CFG_PAGE_2SECTORS;
881 break;
882 case 4:
883 val |= PMECC_CFG_PAGE_4SECTORS;
884 break;
885 case 8:
886 val |= PMECC_CFG_PAGE_8SECTORS;
887 break;
888 }
889
890 val |= (PMECC_CFG_READ_OP | PMECC_CFG_SPARE_DISABLE
891 | PMECC_CFG_AUTO_DISABLE);
892 pmecc_writel(host->ecc, CFG, val);
893
894 ecc_layout = nand_chip->ecc.layout;
895 pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
896 pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
897 pmecc_writel(host->ecc, EADDR,
898 ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
899 /* See datasheet about PMECC Clock Control Register */
900 pmecc_writel(host->ecc, CLK, 2);
901 pmecc_writel(host->ecc, IDR, 0xff);
902 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
903}
904
905static int __init atmel_pmecc_nand_init_params(struct platform_device *pdev,
906 struct atmel_nand_host *host)
907{
908 struct mtd_info *mtd = &host->mtd;
909 struct nand_chip *nand_chip = &host->nand_chip;
910 struct resource *regs, *regs_pmerr, *regs_rom;
911 int cap, sector_size, err_no;
912
913 cap = host->pmecc_corr_cap;
914 sector_size = host->pmecc_sector_size;
915 dev_info(host->dev, "Initialize PMECC params, cap: %d, sector: %d\n",
916 cap, sector_size);
917
918 regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
919 if (!regs) {
920 dev_warn(host->dev,
921 "Can't get I/O resource regs for PMECC controller, rolling back on software ECC\n");
922 nand_chip->ecc.mode = NAND_ECC_SOFT;
923 return 0;
924 }
925
926 host->ecc = ioremap(regs->start, resource_size(regs));
927 if (host->ecc == NULL) {
928 dev_err(host->dev, "ioremap failed\n");
929 err_no = -EIO;
930 goto err_pmecc_ioremap;
931 }
932
933 regs_pmerr = platform_get_resource(pdev, IORESOURCE_MEM, 2);
934 regs_rom = platform_get_resource(pdev, IORESOURCE_MEM, 3);
935 if (regs_pmerr && regs_rom) {
936 host->pmerrloc_base = ioremap(regs_pmerr->start,
937 resource_size(regs_pmerr));
938 host->pmecc_rom_base = ioremap(regs_rom->start,
939 resource_size(regs_rom));
940 }
941
942 if (!host->pmerrloc_base || !host->pmecc_rom_base) {
943 dev_err(host->dev,
944 "Can not get I/O resource for PMECC ERRLOC controller or ROM!\n");
945 err_no = -EIO;
946 goto err_pmloc_ioremap;
947 }
948
949 /* ECC is calculated for the whole page (1 step) */
950 nand_chip->ecc.size = mtd->writesize;
951
952 /* set ECC page size and oob layout */
953 switch (mtd->writesize) {
954 case 2048:
955 host->pmecc_degree = PMECC_GF_DIMENSION_13;
956 host->pmecc_cw_len = (1 << host->pmecc_degree) - 1;
957 host->pmecc_sector_number = mtd->writesize / sector_size;
958 host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes(
959 cap, sector_size);
960 host->pmecc_alpha_to = pmecc_get_alpha_to(host);
961 host->pmecc_index_of = host->pmecc_rom_base +
962 host->pmecc_lookup_table_offset;
963
964 nand_chip->ecc.steps = 1;
965 nand_chip->ecc.strength = cap;
966 nand_chip->ecc.bytes = host->pmecc_bytes_per_sector *
967 host->pmecc_sector_number;
968 if (nand_chip->ecc.bytes > mtd->oobsize - 2) {
969 dev_err(host->dev, "No room for ECC bytes\n");
970 err_no = -EINVAL;
971 goto err_no_ecc_room;
972 }
973 pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
974 mtd->oobsize,
975 nand_chip->ecc.bytes);
976 nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
977 break;
978 case 512:
979 case 1024:
980 case 4096:
981 /* TODO */
982 dev_warn(host->dev,
983 "Unsupported page size for PMECC, use Software ECC\n");
984 default:
985 /* page size not handled by HW ECC */
986 /* switching back to soft ECC */
987 nand_chip->ecc.mode = NAND_ECC_SOFT;
988 return 0;
989 }
990
991 /* Allocate data for PMECC computation */
992 err_no = pmecc_data_alloc(host);
993 if (err_no) {
994 dev_err(host->dev,
995 "Cannot allocate memory for PMECC computation!\n");
996 goto err_pmecc_data_alloc;
997 }
998
999 nand_chip->ecc.read_page = atmel_nand_pmecc_read_page;
1000 nand_chip->ecc.write_page = atmel_nand_pmecc_write_page;
1001
1002 atmel_pmecc_core_init(mtd);
1003
1004 return 0;
1005
1006err_pmecc_data_alloc:
1007err_no_ecc_room:
1008err_pmloc_ioremap:
1009 iounmap(host->ecc);
1010 if (host->pmerrloc_base)
1011 iounmap(host->pmerrloc_base);
1012 if (host->pmecc_rom_base)
1013 iounmap(host->pmecc_rom_base);
1014err_pmecc_ioremap:
1015 return err_no;
1016}
1017
77f5492c
RG		 1018/*
1019 * Calculate HW ECC
1020 *
1021 * function called after a write
1022 *
1023 * mtd: MTD block structure
1024 * dat: raw data (unused)
1025 * ecc_code: buffer for ECC
1026 */
3c3796cc 1027static int atmel_nand_calculate(struct mtd_info *mtd,
77f5492c
RG		 1028 const u_char *dat, unsigned char *ecc_code)
1029{
1030 struct nand_chip *nand_chip = mtd->priv;
3c3796cc 1031 struct atmel_nand_host *host = nand_chip->priv;
77f5492c
RG		 1032 unsigned int ecc_value;
1033
1034 /* get the first 2 ECC bytes */
d43fa149 1035 ecc_value = ecc_readl(host->ecc, PR);
77f5492c 1036
3fc23898
RG		 1037 ecc_code[0] = ecc_value & 0xFF;
1038 ecc_code[1] = (ecc_value >> 8) & 0xFF;
77f5492c
RG		 1039
1040 /* get the last 2 ECC bytes */
3c3796cc 1041 ecc_value = ecc_readl(host->ecc, NPR) & ATMEL_ECC_NPARITY;
77f5492c 1042
3fc23898
RG		 1043 ecc_code[2] = ecc_value & 0xFF;
1044 ecc_code[3] = (ecc_value >> 8) & 0xFF;
77f5492c
RG		 1045
1046 return 0;
1047}
1048
1049/*
1050 * HW ECC read page function
1051 *
1052 * mtd: mtd info structure
1053 * chip: nand chip info structure
1054 * buf: buffer to store read data
1fbb938d 1055 * oob_required: caller expects OOB data read to chip->oob_poi
77f5492c 1056 */
1fbb938d
BN		 1057static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
1058 uint8_t *buf, int oob_required, int page)
77f5492c
RG		 1059{
1060 int eccsize = chip->ecc.size;
1061 int eccbytes = chip->ecc.bytes;
1062 uint32_t *eccpos = chip->ecc.layout->eccpos;
1063 uint8_t *p = buf;
1064 uint8_t *oob = chip->oob_poi;
1065 uint8_t *ecc_pos;
1066 int stat;
3f91e94f 1067 unsigned int max_bitflips = 0;
77f5492c 1068
d6248fdd
HS		 1069 /*
1070 * Errata: ALE is incorrectly wired up to the ECC controller
1071 * on the AP7000, so it will include the address cycles in the
1072 * ECC calculation.
1073 *
1074 * Workaround: Reset the parity registers before reading the
1075 * actual data.
1076 */
1077 if (cpu_is_at32ap7000()) {
1078 struct atmel_nand_host *host = chip->priv;
1079 ecc_writel(host->ecc, CR, ATMEL_ECC_RST);
1080 }
1081
77f5492c
RG		 1082 /* read the page */
1083 chip->read_buf(mtd, p, eccsize);
1084
1085 /* move to ECC position if needed */
1086 if (eccpos[0] != 0) {
1087 /* This only works on large pages
1088 * because the ECC controller waits for
1089 * NAND_CMD_RNDOUTSTART after the
1090 * NAND_CMD_RNDOUT.
1091 * anyway, for small pages, the eccpos[0] == 0
1092 */
1093 chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
1094 mtd->writesize + eccpos[0], -1);
1095 }
1096
1097 /* the ECC controller needs to read the ECC just after the data */
1098 ecc_pos = oob + eccpos[0];
1099 chip->read_buf(mtd, ecc_pos, eccbytes);
1100
1101 /* check if there's an error */
1102 stat = chip->ecc.correct(mtd, p, oob, NULL);
1103
3f91e94f 1104 if (stat < 0) {
77f5492c 1105 mtd->ecc_stats.failed++;
3f91e94f 1106 } else {
77f5492c 1107 mtd->ecc_stats.corrected += stat;
3f91e94f
MD		 1108 max_bitflips = max_t(unsigned int, max_bitflips, stat);
1109 }
77f5492c
RG		 1110
1111 /* get back to oob start (end of page) */
1112 chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
1113
1114 /* read the oob */
1115 chip->read_buf(mtd, oob, mtd->oobsize);
1116
3f91e94f 1117 return max_bitflips;
77f5492c
RG		 1118}
1119
1120/*
1121 * HW ECC Correction
1122 *
1123 * function called after a read
1124 *
1125 * mtd: MTD block structure
1126 * dat: raw data read from the chip
1127 * read_ecc: ECC from the chip (unused)
1128 * isnull: unused
1129 *
1130 * Detect and correct a 1 bit error for a page
1131 */
3c3796cc 1132static int atmel_nand_correct(struct mtd_info *mtd, u_char *dat,
77f5492c
RG		 1133 u_char *read_ecc, u_char *isnull)
1134{
1135 struct nand_chip *nand_chip = mtd->priv;
3c3796cc 1136 struct atmel_nand_host *host = nand_chip->priv;
77f5492c
RG		 1137 unsigned int ecc_status;
1138 unsigned int ecc_word, ecc_bit;
1139
1140 /* get the status from the Status Register */
1141 ecc_status = ecc_readl(host->ecc, SR);
1142
1143 /* if there's no error */
3c3796cc 1144 if (likely(!(ecc_status & ATMEL_ECC_RECERR)))
77f5492c
RG		 1145 return 0;
1146
1147 /* get error bit offset (4 bits) */
3c3796cc 1148 ecc_bit = ecc_readl(host->ecc, PR) & ATMEL_ECC_BITADDR;
77f5492c 1149 /* get word address (12 bits) */
3c3796cc 1150 ecc_word = ecc_readl(host->ecc, PR) & ATMEL_ECC_WORDADDR;
77f5492c
RG		 1151 ecc_word >>= 4;
1152
1153 /* if there are multiple errors */
3c3796cc 1154 if (ecc_status & ATMEL_ECC_MULERR) {
77f5492c
RG		 1155 /* check if it is a freshly erased block
1156 * (filled with 0xff) */
3c3796cc
HS		 1157 if ((ecc_bit == ATMEL_ECC_BITADDR)
1158 && (ecc_word == (ATMEL_ECC_WORDADDR >> 4))) {
77f5492c
RG		 1159 /* the block has just been erased, return OK */
1160 return 0;
1161 }
1162 /* it doesn't seems to be a freshly
1163 * erased block.
1164 * We can't correct so many errors */
3c3796cc 1165 dev_dbg(host->dev, "atmel_nand : multiple errors detected."
77f5492c
RG		 1166 " Unable to correct.\n");
1167 return -EIO;
1168 }
1169
1170 /* if there's a single bit error : we can correct it */
3c3796cc 1171 if (ecc_status & ATMEL_ECC_ECCERR) {
77f5492c
RG		 1172 /* there's nothing much to do here.
1173 * the bit error is on the ECC itself.
1174 */
3c3796cc 1175 dev_dbg(host->dev, "atmel_nand : one bit error on ECC code."
77f5492c
RG		 1176 " Nothing to correct\n");
1177 return 0;
1178 }
1179
3c3796cc 1180 dev_dbg(host->dev, "atmel_nand : one bit error on data."
77f5492c
RG		 1181 " (word offset in the page :"
1182 " 0x%x bit offset : 0x%x)\n",
1183 ecc_word, ecc_bit);
1184 /* correct the error */
1185 if (nand_chip->options & NAND_BUSWIDTH_16) {
1186 /* 16 bits words */
1187 ((unsigned short *) dat)[ecc_word] ^= (1 << ecc_bit);
1188 } else {
1189 /* 8 bits words */
1190 dat[ecc_word] ^= (1 << ecc_bit);
1191 }
3c3796cc 1192 dev_dbg(host->dev, "atmel_nand : error corrected\n");
77f5492c
RG		 1193 return 1;
1194}
1195
1196/*
d6248fdd 1197 * Enable HW ECC : unused on most chips
77f5492c 1198 */
d6248fdd
HS		 1199static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
1200{
1201 if (cpu_is_at32ap7000()) {
1202 struct nand_chip *nand_chip = mtd->priv;
1203 struct atmel_nand_host *host = nand_chip->priv;
1204 ecc_writel(host->ecc, CR, ATMEL_ECC_RST);
1205 }
1206}
77f5492c 1207
d6a01661
JCPV		 1208#if defined(CONFIG_OF)
1209static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
1210 struct device_node *np)
1211{
a41b51a1
JW		 1212 u32 val, table_offset;
1213 u32 offset[2];
d6a01661
JCPV		 1214 int ecc_mode;
1215 struct atmel_nand_data *board = &host->board;
1216 enum of_gpio_flags flags;
1217
1218 if (of_property_read_u32(np, "atmel,nand-addr-offset", &val) == 0) {
1219 if (val >= 32) {
1220 dev_err(host->dev, "invalid addr-offset %u\n", val);
1221 return -EINVAL;
1222 }
1223 board->ale = val;
1224 }
1225
1226 if (of_property_read_u32(np, "atmel,nand-cmd-offset", &val) == 0) {
1227 if (val >= 32) {
1228 dev_err(host->dev, "invalid cmd-offset %u\n", val);
1229 return -EINVAL;
1230 }
1231 board->cle = val;
1232 }
1233
1234 ecc_mode = of_get_nand_ecc_mode(np);
1235
1236 board->ecc_mode = ecc_mode < 0 ? NAND_ECC_SOFT : ecc_mode;
1237
1238 board->on_flash_bbt = of_get_nand_on_flash_bbt(np);
1239
1240 if (of_get_nand_bus_width(np) == 16)
1241 board->bus_width_16 = 1;
1242
1243 board->rdy_pin = of_get_gpio_flags(np, 0, &flags);
1244 board->rdy_pin_active_low = (flags == OF_GPIO_ACTIVE_LOW);
1245
1246 board->enable_pin = of_get_gpio(np, 1);
1247 board->det_pin = of_get_gpio(np, 2);
1248
a41b51a1
JW		 1249 host->has_pmecc = of_property_read_bool(np, "atmel,has-pmecc");
1250
1251 if (!(board->ecc_mode == NAND_ECC_HW) || !host->has_pmecc)
1252 return 0; /* Not using PMECC */
1253
1254 /* use PMECC, get correction capability, sector size and lookup
1255 * table offset.
1256 */
1257 if (of_property_read_u32(np, "atmel,pmecc-cap", &val) != 0) {
1258 dev_err(host->dev, "Cannot decide PMECC Capability\n");
1259 return -EINVAL;
1260 } else if ((val != 2) && (val != 4) && (val != 8) && (val != 12) &&
1261 (val != 24)) {
1262 dev_err(host->dev,
1263 "Unsupported PMECC correction capability: %d; should be 2, 4, 8, 12 or 24\n",
1264 val);
1265 return -EINVAL;
1266 }
1267 host->pmecc_corr_cap = (u8)val;
1268
1269 if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) != 0) {
1270 dev_err(host->dev, "Cannot decide PMECC Sector Size\n");
1271 return -EINVAL;
1272 } else if ((val != 512) && (val != 1024)) {
1273 dev_err(host->dev,
1274 "Unsupported PMECC sector size: %d; should be 512 or 1024 bytes\n",
1275 val);
1276 return -EINVAL;
1277 }
1278 host->pmecc_sector_size = (u16)val;
1279
1280 if (of_property_read_u32_array(np, "atmel,pmecc-lookup-table-offset",
1281 offset, 2) != 0) {
1282 dev_err(host->dev, "Cannot get PMECC lookup table offset\n");
1283 return -EINVAL;
1284 }
1285 table_offset = host->pmecc_sector_size == 512 ? offset[0] : offset[1];
1286
1287 if (!table_offset) {
1288 dev_err(host->dev, "Invalid PMECC lookup table offset\n");
1289 return -EINVAL;
1290 }
1291 host->pmecc_lookup_table_offset = table_offset;
1292
d6a01661
JCPV		 1293 return 0;
1294}
1295#else
1296static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
1297 struct device_node *np)
1298{
1299 return -EINVAL;
1300}
1301#endif
1302
3dfe41a4
JW		 1303static int __init atmel_hw_nand_init_params(struct platform_device *pdev,
1304 struct atmel_nand_host *host)
1305{
1306 struct mtd_info *mtd = &host->mtd;
1307 struct nand_chip *nand_chip = &host->nand_chip;
1308 struct resource *regs;
1309
1310 regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1311 if (!regs) {
1312 dev_err(host->dev,
1313 "Can't get I/O resource regs, use software ECC\n");
1314 nand_chip->ecc.mode = NAND_ECC_SOFT;
1315 return 0;
1316 }
1317
1318 host->ecc = ioremap(regs->start, resource_size(regs));
1319 if (host->ecc == NULL) {
1320 dev_err(host->dev, "ioremap failed\n");
1321 return -EIO;
1322 }
1323
1324 /* ECC is calculated for the whole page (1 step) */
1325 nand_chip->ecc.size = mtd->writesize;
1326
1327 /* set ECC page size and oob layout */
1328 switch (mtd->writesize) {
1329 case 512:
1330 nand_chip->ecc.layout = &atmel_oobinfo_small;
1331 ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
1332 break;
1333 case 1024:
1334 nand_chip->ecc.layout = &atmel_oobinfo_large;
1335 ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
1336 break;
1337 case 2048:
1338 nand_chip->ecc.layout = &atmel_oobinfo_large;
1339 ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
1340 break;
1341 case 4096:
1342 nand_chip->ecc.layout = &atmel_oobinfo_large;
1343 ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
1344 break;
1345 default:
1346 /* page size not handled by HW ECC */
1347 /* switching back to soft ECC */
1348 nand_chip->ecc.mode = NAND_ECC_SOFT;
1349 return 0;
1350 }
1351
1352 /* set up for HW ECC */
1353 nand_chip->ecc.calculate = atmel_nand_calculate;
1354 nand_chip->ecc.correct = atmel_nand_correct;
1355 nand_chip->ecc.hwctl = atmel_nand_hwctl;
1356 nand_chip->ecc.read_page = atmel_nand_read_page;
1357 nand_chip->ecc.bytes = 4;
1358 nand_chip->ecc.strength = 1;
1359
1360 return 0;
1361}
1362
42cb1403
AV		 1363/*
1364 * Probe for the NAND device.
1365 */
3c3796cc 1366static int __init atmel_nand_probe(struct platform_device *pdev)
42cb1403 1367{
3c3796cc 1368 struct atmel_nand_host *host;
42cb1403
AV		 1369 struct mtd_info *mtd;
1370 struct nand_chip *nand_chip;
77f5492c 1371 struct resource *mem;
d6a01661 1372 struct mtd_part_parser_data ppdata = {};
42cb1403 1373 int res;
251e783a 1374 struct pinctrl *pinctrl;
42cb1403 1375
cc0c72e1
HS		 1376 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1377 if (!mem) {
1378 printk(KERN_ERR "atmel_nand: can't get I/O resource mem\n");
1379 return -ENXIO;
1380 }
1381
42cb1403 1382 /* Allocate memory for the device structure (and zero it) */
3c3796cc 1383 host = kzalloc(sizeof(struct atmel_nand_host), GFP_KERNEL);
42cb1403 1384 if (!host) {
3c3796cc 1385 printk(KERN_ERR "atmel_nand: failed to allocate device structure.\n");
42cb1403
AV		 1386 return -ENOMEM;
1387 }
1388
cbc6c5e7
HX		 1389 host->io_phys = (dma_addr_t)mem->start;
1390
28f65c11 1391 host->io_base = ioremap(mem->start, resource_size(mem));
42cb1403 1392 if (host->io_base == NULL) {
3c3796cc 1393 printk(KERN_ERR "atmel_nand: ioremap failed\n");
cc0c72e1
HS		 1394 res = -EIO;
1395 goto err_nand_ioremap;
42cb1403
AV		 1396 }
1397
1398 mtd = &host->mtd;
1399 nand_chip = &host->nand_chip;
77f5492c 1400 host->dev = &pdev->dev;
d6a01661
JCPV		 1401 if (pdev->dev.of_node) {
1402 res = atmel_of_init_port(host, pdev->dev.of_node);
1403 if (res)
28446acb 1404 goto err_ecc_ioremap;
d6a01661
JCPV		 1405 } else {
1406 memcpy(&host->board, pdev->dev.platform_data,
1407 sizeof(struct atmel_nand_data));
1408 }
42cb1403
AV		 1409
1410 nand_chip->priv = host; /* link the private data structures */
1411 mtd->priv = nand_chip;
1412 mtd->owner = THIS_MODULE;
1413
1414 /* Set address of NAND IO lines */
1415 nand_chip->IO_ADDR_R = host->io_base;
1416 nand_chip->IO_ADDR_W = host->io_base;
3c3796cc 1417 nand_chip->cmd_ctrl = atmel_nand_cmd_ctrl;
a4265f8d 1418
251e783a
JCPV		 1419 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
1420 if (IS_ERR(pinctrl)) {
1421 dev_err(host->dev, "Failed to request pinctrl\n");
1422 res = PTR_ERR(pinctrl);
1423 goto err_ecc_ioremap;
1424 }
1425
28446acb
JCPV		 1426 if (gpio_is_valid(host->board.rdy_pin)) {
1427 res = gpio_request(host->board.rdy_pin, "nand_rdy");
1428 if (res < 0) {
1429 dev_err(&pdev->dev,
1430 "can't request rdy gpio %d\n",
1431 host->board.rdy_pin);
1432 goto err_ecc_ioremap;
1433 }
1434
1435 res = gpio_direction_input(host->board.rdy_pin);
1436 if (res < 0) {
1437 dev_err(&pdev->dev,
1438 "can't request input direction rdy gpio %d\n",
1439 host->board.rdy_pin);
1440 goto err_ecc_ioremap;
1441 }
1442
3c3796cc 1443 nand_chip->dev_ready = atmel_nand_device_ready;
28446acb
JCPV		 1444 }
1445
1446 if (gpio_is_valid(host->board.enable_pin)) {
1447 res = gpio_request(host->board.enable_pin, "nand_enable");
1448 if (res < 0) {
1449 dev_err(&pdev->dev,
1450 "can't request enable gpio %d\n",
1451 host->board.enable_pin);
1452 goto err_ecc_ioremap;
1453 }
1454
1455 res = gpio_direction_output(host->board.enable_pin, 1);
1456 if (res < 0) {
1457 dev_err(&pdev->dev,
1458 "can't request output direction enable gpio %d\n",
1459 host->board.enable_pin);
1460 goto err_ecc_ioremap;
1461 }
1462 }
a4265f8d 1463
d6a01661 1464 nand_chip->ecc.mode = host->board.ecc_mode;
42cb1403
AV		 1465 nand_chip->chip_delay = 20; /* 20us command delay time */
1466
d6a01661 1467 if (host->board.bus_width_16) /* 16-bit bus width */
dd11b8cd 1468 nand_chip->options |= NAND_BUSWIDTH_16;
cbc6c5e7
HX		 1469
1470 nand_chip->read_buf = atmel_read_buf;
1471 nand_chip->write_buf = atmel_write_buf;
dd11b8cd 1472
42cb1403 1473 platform_set_drvdata(pdev, host);
3c3796cc 1474 atmel_nand_enable(host);
42cb1403 1475
d6a01661 1476 if (gpio_is_valid(host->board.det_pin)) {
28446acb
JCPV		 1477 res = gpio_request(host->board.det_pin, "nand_det");
1478 if (res < 0) {
1479 dev_err(&pdev->dev,
1480 "can't request det gpio %d\n",
1481 host->board.det_pin);
1482 goto err_no_card;
1483 }
1484
1485 res = gpio_direction_input(host->board.det_pin);
1486 if (res < 0) {
1487 dev_err(&pdev->dev,
1488 "can't request input direction det gpio %d\n",
1489 host->board.det_pin);
1490 goto err_no_card;
1491 }
1492
d6a01661 1493 if (gpio_get_value(host->board.det_pin)) {
f4fa697c 1494 printk(KERN_INFO "No SmartMedia card inserted.\n");
895fb494 1495 res = -ENXIO;
cc0c72e1 1496 goto err_no_card;
42cb1403
AV		 1497 }
1498 }
1499
d6a01661 1500 if (host->board.on_flash_bbt || on_flash_bbt) {
f4fa697c 1501 printk(KERN_INFO "atmel_nand: Use On Flash BBT\n");
bb9ebd4e 1502 nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
f4fa697c
SP		 1503 }
1504
cb457a4d
HX		 1505 if (!cpu_has_dma())
1506 use_dma = 0;
1507
1508 if (use_dma) {
cbc6c5e7
HX		 1509 dma_cap_mask_t mask;
1510
1511 dma_cap_zero(mask);
1512 dma_cap_set(DMA_MEMCPY, mask);
201ab536 1513 host->dma_chan = dma_request_channel(mask, NULL, NULL);
cbc6c5e7
HX		 1514 if (!host->dma_chan) {
1515 dev_err(host->dev, "Failed to request DMA channel\n");
1516 use_dma = 0;
1517 }
1518 }
1519 if (use_dma)
042bc9c0
NF		 1520 dev_info(host->dev, "Using %s for DMA transfers.\n",
1521 dma_chan_name(host->dma_chan));
cbc6c5e7
HX		 1522 else
1523 dev_info(host->dev, "No DMA support for NAND access.\n");
1524
77f5492c 1525 /* first scan to find the device and get the page size */
5e81e88a 1526 if (nand_scan_ident(mtd, 1, NULL)) {
77f5492c 1527 res = -ENXIO;
cc0c72e1 1528 goto err_scan_ident;
77f5492c
RG		 1529 }
1530
3fc23898 1531 if (nand_chip->ecc.mode == NAND_ECC_HW) {
1c7b874d
JW		 1532 if (host->has_pmecc)
1533 res = atmel_pmecc_nand_init_params(pdev, host);
1534 else
1535 res = atmel_hw_nand_init_params(pdev, host);
1536
3dfe41a4
JW		 1537 if (res != 0)
1538 goto err_hw_ecc;
77f5492c
RG		 1539 }
1540
1541 /* second phase scan */
1542 if (nand_scan_tail(mtd)) {
42cb1403 1543 res = -ENXIO;
cc0c72e1 1544 goto err_scan_tail;
42cb1403
AV		 1545 }
1546
3c3796cc 1547 mtd->name = "atmel_nand";
d6a01661
JCPV		 1548 ppdata.of_node = pdev->dev.of_node;
1549 res = mtd_device_parse_register(mtd, NULL, &ppdata,
1550 host->board.parts, host->board.num_parts);
42cb1403
AV		 1551 if (!res)
1552 return res;
1553
cc0c72e1 1554err_scan_tail:
1c7b874d
JW		 1555 if (host->has_pmecc && host->nand_chip.ecc.mode == NAND_ECC_HW) {
1556 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
1557 pmecc_data_free(host);
1558 }
3dfe41a4
JW		 1559 if (host->ecc)
1560 iounmap(host->ecc);
1c7b874d
JW		 1561 if (host->pmerrloc_base)
1562 iounmap(host->pmerrloc_base);
1563 if (host->pmecc_rom_base)
1564 iounmap(host->pmecc_rom_base);
3dfe41a4 1565err_hw_ecc:
cc0c72e1
HS		 1566err_scan_ident:
1567err_no_card:
3c3796cc 1568 atmel_nand_disable(host);
42cb1403 1569 platform_set_drvdata(pdev, NULL);
cbc6c5e7
HX		 1570 if (host->dma_chan)
1571 dma_release_channel(host->dma_chan);
28446acb 1572err_ecc_ioremap:
42cb1403 1573 iounmap(host->io_base);
cc0c72e1 1574err_nand_ioremap:
42cb1403
AV		 1575 kfree(host);
1576 return res;
1577}
1578
1579/*
1580 * Remove a NAND device.
1581 */
23a346ca 1582static int __exit atmel_nand_remove(struct platform_device *pdev)
42cb1403 1583{
3c3796cc 1584 struct atmel_nand_host *host = platform_get_drvdata(pdev);
42cb1403
AV		 1585 struct mtd_info *mtd = &host->mtd;
1586
1587 nand_release(mtd);
1588
3c3796cc 1589 atmel_nand_disable(host);
42cb1403 1590
1c7b874d
JW		 1591 if (host->has_pmecc && host->nand_chip.ecc.mode == NAND_ECC_HW) {
1592 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
1593 pmerrloc_writel(host->pmerrloc_base, ELDIS,
1594 PMERRLOC_DISABLE);
1595 pmecc_data_free(host);
1596 }
1597
28446acb
JCPV		 1598 if (gpio_is_valid(host->board.det_pin))
1599 gpio_free(host->board.det_pin);
1600
1601 if (gpio_is_valid(host->board.enable_pin))
1602 gpio_free(host->board.enable_pin);
1603
1604 if (gpio_is_valid(host->board.rdy_pin))
1605 gpio_free(host->board.rdy_pin);
1606
cc0c72e1
HS		 1607 if (host->ecc)
1608 iounmap(host->ecc);
1c7b874d
JW		 1609 if (host->pmecc_rom_base)
1610 iounmap(host->pmecc_rom_base);
1611 if (host->pmerrloc_base)
1612 iounmap(host->pmerrloc_base);
cbc6c5e7
HX		 1613
1614 if (host->dma_chan)
1615 dma_release_channel(host->dma_chan);
1616
42cb1403
AV		 1617 iounmap(host->io_base);
1618 kfree(host);
1619
1620 return 0;
1621}
1622
d6a01661
JCPV		 1623#if defined(CONFIG_OF)
1624static const struct of_device_id atmel_nand_dt_ids[] = {
1625 { .compatible = "atmel,at91rm9200-nand" },
1626 { /* sentinel */ }
1627};
1628
1629MODULE_DEVICE_TABLE(of, atmel_nand_dt_ids);
1630#endif
1631
3c3796cc 1632static struct platform_driver atmel_nand_driver = {
23a346ca 1633 .remove = __exit_p(atmel_nand_remove),
42cb1403 1634 .driver = {
3c3796cc 1635 .name = "atmel_nand",
42cb1403 1636 .owner = THIS_MODULE,
d6a01661 1637 .of_match_table = of_match_ptr(atmel_nand_dt_ids),
42cb1403
AV		 1638 },
1639};
1640
3c3796cc 1641static int __init atmel_nand_init(void)
42cb1403 1642{
23a346ca 1643 return platform_driver_probe(&atmel_nand_driver, atmel_nand_probe);
42cb1403
AV		 1644}
1645
1646
3c3796cc 1647static void __exit atmel_nand_exit(void)
42cb1403 1648{
3c3796cc 1649 platform_driver_unregister(&atmel_nand_driver);
42cb1403
AV		 1650}
1651
1652
3c3796cc
HS		 1653module_init(atmel_nand_init);
1654module_exit(atmel_nand_exit);
42cb1403
AV		 1655
1656MODULE_LICENSE("GPL");
1657MODULE_AUTHOR("Rick Bronson");
d4f4c0aa 1658MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91 / AVR32");
3c3796cc 1659MODULE_ALIAS("platform:atmel_nand");
Linux kernel - Deliverables
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