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22#include <linux/slab.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/mtd/mtd.h>
26#include <linux/mtd/rawnand.h>
27#include <linux/mtd/partitions.h>
28#include <linux/clk.h>
29#include <linux/err.h>
30#include <linux/delay.h>
31#include <linux/io.h>
32#include <linux/mm.h>
33#include <linux/dma-mapping.h>
34#include <linux/dmaengine.h>
35#include <linux/mtd/nand_ecc.h>
36#include <linux/gpio.h>
37#include <linux/of.h>
38#include <linux/of_gpio.h>
39#include <linux/mtd/lpc32xx_slc.h>
40
41#define LPC32XX_MODNAME "lpc32xx-nand"
42
43
44
45
46
47#define SLC_DATA(x) (x + 0x000)
48#define SLC_ADDR(x) (x + 0x004)
49#define SLC_CMD(x) (x + 0x008)
50#define SLC_STOP(x) (x + 0x00C)
51#define SLC_CTRL(x) (x + 0x010)
52#define SLC_CFG(x) (x + 0x014)
53#define SLC_STAT(x) (x + 0x018)
54#define SLC_INT_STAT(x) (x + 0x01C)
55#define SLC_IEN(x) (x + 0x020)
56#define SLC_ISR(x) (x + 0x024)
57#define SLC_ICR(x) (x + 0x028)
58#define SLC_TAC(x) (x + 0x02C)
59#define SLC_TC(x) (x + 0x030)
60#define SLC_ECC(x) (x + 0x034)
61#define SLC_DMA_DATA(x) (x + 0x038)
62
63
64
65
66#define SLCCTRL_SW_RESET (1 << 2)
67#define SLCCTRL_ECC_CLEAR (1 << 1)
68#define SLCCTRL_DMA_START (1 << 0)
69
70
71
72
73#define SLCCFG_CE_LOW (1 << 5)
74#define SLCCFG_DMA_ECC (1 << 4)
75#define SLCCFG_ECC_EN (1 << 3)
76#define SLCCFG_DMA_BURST (1 << 2)
77#define SLCCFG_DMA_DIR (1 << 1)
78#define SLCCFG_WIDTH (1 << 0)
79
80
81
82
83#define SLCSTAT_DMA_FIFO (1 << 2)
84#define SLCSTAT_SLC_FIFO (1 << 1)
85#define SLCSTAT_NAND_READY (1 << 0)
86
87
88
89
90#define SLCSTAT_INT_TC (1 << 1)
91#define SLCSTAT_INT_RDY_EN (1 << 0)
92
93
94
95
96
97#define SLCTAC_CLOCKS(c, n, s) (min_t(u32, DIV_ROUND_UP(c, n) - 1, 0xF) << s)
98
99
100#define SLCTAC_WDR(n) (((n) & 0xF) << 28)
101
102#define SLCTAC_WWIDTH(c, n) (SLCTAC_CLOCKS(c, n, 24))
103
104#define SLCTAC_WHOLD(c, n) (SLCTAC_CLOCKS(c, n, 20))
105
106#define SLCTAC_WSETUP(c, n) (SLCTAC_CLOCKS(c, n, 16))
107
108#define SLCTAC_RDR(n) (((n) & 0xF) << 12)
109
110#define SLCTAC_RWIDTH(c, n) (SLCTAC_CLOCKS(c, n, 8))
111
112#define SLCTAC_RHOLD(c, n) (SLCTAC_CLOCKS(c, n, 4))
113
114#define SLCTAC_RSETUP(c, n) (SLCTAC_CLOCKS(c, n, 0))
115
116
117
118
119
120#define SLCECC_TO_LINEPAR(n) (((n) >> 6) & 0x7FFF)
121#define SLCECC_TO_COLPAR(n) ((n) & 0x3F)
122
123
124
125
126
127
128#define LPC32XX_DMA_DATA_SIZE 4096
129#define LPC32XX_ECC_SAVE_SIZE ((4096 / 256) * 4)
130
131
132#define LPC32XX_SLC_DEV_ECC_BYTES 3
133
134
135
136
137
138
139#define LPC32XX_DEF_BUS_RATE 133250000
140
141
142#define LPC32XX_DMA_TIMEOUT 100
143
144
145
146
147
148static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
149 struct mtd_oob_region *oobregion)
150{
151 if (section)
152 return -ERANGE;
153
154 oobregion->length = 6;
155 oobregion->offset = 10;
156
157 return 0;
158}
159
160static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
161 struct mtd_oob_region *oobregion)
162{
163 if (section > 1)
164 return -ERANGE;
165
166 if (!section) {
167 oobregion->offset = 0;
168 oobregion->length = 4;
169 } else {
170 oobregion->offset = 6;
171 oobregion->length = 4;
172 }
173
174 return 0;
175}
176
177static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
178 .ecc = lpc32xx_ooblayout_ecc,
179 .free = lpc32xx_ooblayout_free,
180};
181
182static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
183static u8 mirror_pattern[] = {'1', 't', 'b', 'B' };
184
185
186
187
188
189static struct nand_bbt_descr bbt_smallpage_main_descr = {
190 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
191 | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
192 .offs = 0,
193 .len = 4,
194 .veroffs = 6,
195 .maxblocks = 4,
196 .pattern = bbt_pattern
197};
198
199static struct nand_bbt_descr bbt_smallpage_mirror_descr = {
200 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
201 | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
202 .offs = 0,
203 .len = 4,
204 .veroffs = 6,
205 .maxblocks = 4,
206 .pattern = mirror_pattern
207};
208
209
210
211
212struct lpc32xx_nand_cfg_slc {
213 uint32_t wdr_clks;
214 uint32_t wwidth;
215 uint32_t whold;
216 uint32_t wsetup;
217 uint32_t rdr_clks;
218 uint32_t rwidth;
219 uint32_t rhold;
220 uint32_t rsetup;
221 int wp_gpio;
222 struct mtd_partition *parts;
223 unsigned num_parts;
224};
225
226struct lpc32xx_nand_host {
227 struct nand_chip nand_chip;
228 struct lpc32xx_slc_platform_data *pdata;
229 struct clk *clk;
230 void __iomem *io_base;
231 struct lpc32xx_nand_cfg_slc *ncfg;
232
233 struct completion comp;
234 struct dma_chan *dma_chan;
235 uint32_t dma_buf_len;
236 struct dma_slave_config dma_slave_config;
237 struct scatterlist sgl;
238
239
240
241
242 uint32_t *ecc_buf;
243 uint8_t *data_buf;
244 dma_addr_t io_base_dma;
245};
246
247static void lpc32xx_nand_setup(struct lpc32xx_nand_host *host)
248{
249 uint32_t clkrate, tmp;
250
251
252 writel(SLCCTRL_SW_RESET, SLC_CTRL(host->io_base));
253 udelay(1000);
254
255
256 writel(0, SLC_CFG(host->io_base));
257 writel(0, SLC_IEN(host->io_base));
258 writel((SLCSTAT_INT_TC | SLCSTAT_INT_RDY_EN),
259 SLC_ICR(host->io_base));
260
261
262 clkrate = clk_get_rate(host->clk);
263 if (clkrate == 0)
264 clkrate = LPC32XX_DEF_BUS_RATE;
265
266
267 tmp = SLCTAC_WDR(host->ncfg->wdr_clks) |
268 SLCTAC_WWIDTH(clkrate, host->ncfg->wwidth) |
269 SLCTAC_WHOLD(clkrate, host->ncfg->whold) |
270 SLCTAC_WSETUP(clkrate, host->ncfg->wsetup) |
271 SLCTAC_RDR(host->ncfg->rdr_clks) |
272 SLCTAC_RWIDTH(clkrate, host->ncfg->rwidth) |
273 SLCTAC_RHOLD(clkrate, host->ncfg->rhold) |
274 SLCTAC_RSETUP(clkrate, host->ncfg->rsetup);
275 writel(tmp, SLC_TAC(host->io_base));
276}
277
278
279
280
281static void lpc32xx_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
282 unsigned int ctrl)
283{
284 uint32_t tmp;
285 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
286
287
288 tmp = readl(SLC_CFG(host->io_base));
289 if (ctrl & NAND_NCE)
290 tmp |= SLCCFG_CE_LOW;
291 else
292 tmp &= ~SLCCFG_CE_LOW;
293 writel(tmp, SLC_CFG(host->io_base));
294
295 if (cmd != NAND_CMD_NONE) {
296 if (ctrl & NAND_CLE)
297 writel(cmd, SLC_CMD(host->io_base));
298 else
299 writel(cmd, SLC_ADDR(host->io_base));
300 }
301}
302
303
304
305
306static int lpc32xx_nand_device_ready(struct nand_chip *chip)
307{
308 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
309 int rdy = 0;
310
311 if ((readl(SLC_STAT(host->io_base)) & SLCSTAT_NAND_READY) != 0)
312 rdy = 1;
313
314 return rdy;
315}
316
317
318
319
320static void lpc32xx_wp_enable(struct lpc32xx_nand_host *host)
321{
322 if (gpio_is_valid(host->ncfg->wp_gpio))
323 gpio_set_value(host->ncfg->wp_gpio, 0);
324}
325
326
327
328
329static void lpc32xx_wp_disable(struct lpc32xx_nand_host *host)
330{
331 if (gpio_is_valid(host->ncfg->wp_gpio))
332 gpio_set_value(host->ncfg->wp_gpio, 1);
333}
334
335
336
337
338static void lpc32xx_nand_ecc_enable(struct nand_chip *chip, int mode)
339{
340
341}
342
343
344
345
346static int lpc32xx_nand_ecc_calculate(struct nand_chip *chip,
347 const unsigned char *buf,
348 unsigned char *code)
349{
350
351
352
353
354 return 0;
355}
356
357
358
359
360static uint8_t lpc32xx_nand_read_byte(struct nand_chip *chip)
361{
362 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
363
364 return (uint8_t)readl(SLC_DATA(host->io_base));
365}
366
367
368
369
370static void lpc32xx_nand_read_buf(struct nand_chip *chip, u_char *buf, int len)
371{
372 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
373
374
375 while (len-- > 0)
376 *buf++ = (uint8_t)readl(SLC_DATA(host->io_base));
377}
378
379
380
381
382static void lpc32xx_nand_write_buf(struct nand_chip *chip, const uint8_t *buf,
383 int len)
384{
385 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
386
387
388 while (len-- > 0)
389 writel((uint32_t)*buf++, SLC_DATA(host->io_base));
390}
391
392
393
394
395static int lpc32xx_nand_read_oob_syndrome(struct nand_chip *chip, int page)
396{
397 struct mtd_info *mtd = nand_to_mtd(chip);
398
399 return nand_read_oob_op(chip, page, 0, chip->oob_poi, mtd->oobsize);
400}
401
402
403
404
405static int lpc32xx_nand_write_oob_syndrome(struct nand_chip *chip, int page)
406{
407 struct mtd_info *mtd = nand_to_mtd(chip);
408
409 return nand_prog_page_op(chip, page, mtd->writesize, chip->oob_poi,
410 mtd->oobsize);
411}
412
413
414
415
416static void lpc32xx_slc_ecc_copy(uint8_t *spare, const uint32_t *ecc, int count)
417{
418 int i;
419
420 for (i = 0; i < (count * 3); i += 3) {
421 uint32_t ce = ecc[i / 3];
422 ce = ~(ce << 2) & 0xFFFFFF;
423 spare[i + 2] = (uint8_t)(ce & 0xFF);
424 ce >>= 8;
425 spare[i + 1] = (uint8_t)(ce & 0xFF);
426 ce >>= 8;
427 spare[i] = (uint8_t)(ce & 0xFF);
428 }
429}
430
431static void lpc32xx_dma_complete_func(void *completion)
432{
433 complete(completion);
434}
435
436static int lpc32xx_xmit_dma(struct mtd_info *mtd, dma_addr_t dma,
437 void *mem, int len, enum dma_transfer_direction dir)
438{
439 struct nand_chip *chip = mtd_to_nand(mtd);
440 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
441 struct dma_async_tx_descriptor *desc;
442 int flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
443 int res;
444
445 host->dma_slave_config.direction = dir;
446 host->dma_slave_config.src_addr = dma;
447 host->dma_slave_config.dst_addr = dma;
448 host->dma_slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
449 host->dma_slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
450 host->dma_slave_config.src_maxburst = 4;
451 host->dma_slave_config.dst_maxburst = 4;
452
453 host->dma_slave_config.device_fc = false;
454 if (dmaengine_slave_config(host->dma_chan, &host->dma_slave_config)) {
455 dev_err(mtd->dev.parent, "Failed to setup DMA slave\n");
456 return -ENXIO;
457 }
458
459 sg_init_one(&host->sgl, mem, len);
460
461 res = dma_map_sg(host->dma_chan->device->dev, &host->sgl, 1,
462 DMA_BIDIRECTIONAL);
463 if (res != 1) {
464 dev_err(mtd->dev.parent, "Failed to map sg list\n");
465 return -ENXIO;
466 }
467 desc = dmaengine_prep_slave_sg(host->dma_chan, &host->sgl, 1, dir,
468 flags);
469 if (!desc) {
470 dev_err(mtd->dev.parent, "Failed to prepare slave sg\n");
471 goto out1;
472 }
473
474 init_completion(&host->comp);
475 desc->callback = lpc32xx_dma_complete_func;
476 desc->callback_param = &host->comp;
477
478 dmaengine_submit(desc);
479 dma_async_issue_pending(host->dma_chan);
480
481 wait_for_completion_timeout(&host->comp, msecs_to_jiffies(1000));
482
483 dma_unmap_sg(host->dma_chan->device->dev, &host->sgl, 1,
484 DMA_BIDIRECTIONAL);
485
486 return 0;
487out1:
488 dma_unmap_sg(host->dma_chan->device->dev, &host->sgl, 1,
489 DMA_BIDIRECTIONAL);
490 return -ENXIO;
491}
492
493
494
495
496static int lpc32xx_xfer(struct mtd_info *mtd, uint8_t *buf, int eccsubpages,
497 int read)
498{
499 struct nand_chip *chip = mtd_to_nand(mtd);
500 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
501 int i, status = 0;
502 unsigned long timeout;
503 int res;
504 enum dma_transfer_direction dir =
505 read ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
506 uint8_t *dma_buf;
507 bool dma_mapped;
508
509 if ((void *)buf <= high_memory) {
510 dma_buf = buf;
511 dma_mapped = true;
512 } else {
513 dma_buf = host->data_buf;
514 dma_mapped = false;
515 if (!read)
516 memcpy(host->data_buf, buf, mtd->writesize);
517 }
518
519 if (read) {
520 writel(readl(SLC_CFG(host->io_base)) |
521 SLCCFG_DMA_DIR | SLCCFG_ECC_EN | SLCCFG_DMA_ECC |
522 SLCCFG_DMA_BURST, SLC_CFG(host->io_base));
523 } else {
524 writel((readl(SLC_CFG(host->io_base)) |
525 SLCCFG_ECC_EN | SLCCFG_DMA_ECC | SLCCFG_DMA_BURST) &
526 ~SLCCFG_DMA_DIR,
527 SLC_CFG(host->io_base));
528 }
529
530
531 writel(SLCCTRL_ECC_CLEAR, SLC_CTRL(host->io_base));
532
533
534 writel(mtd->writesize, SLC_TC(host->io_base));
535
536
537 writel(readl(SLC_CTRL(host->io_base)) | SLCCTRL_DMA_START,
538 SLC_CTRL(host->io_base));
539
540 for (i = 0; i < chip->ecc.steps; i++) {
541
542 res = lpc32xx_xmit_dma(mtd, SLC_DMA_DATA(host->io_base_dma),
543 dma_buf + i * chip->ecc.size,
544 mtd->writesize / chip->ecc.steps, dir);
545 if (res)
546 return res;
547
548
549 if (i == chip->ecc.steps - 1)
550 break;
551 if (!read)
552 udelay(10);
553 res = lpc32xx_xmit_dma(mtd, SLC_ECC(host->io_base_dma),
554 &host->ecc_buf[i], 4, DMA_DEV_TO_MEM);
555 if (res)
556 return res;
557 }
558
559
560
561
562
563
564
565
566 if (readl(SLC_STAT(host->io_base)) & SLCSTAT_DMA_FIFO) {
567 dev_warn(mtd->dev.parent, "FIFO not empty!\n");
568 timeout = jiffies + msecs_to_jiffies(LPC32XX_DMA_TIMEOUT);
569 while ((readl(SLC_STAT(host->io_base)) & SLCSTAT_DMA_FIFO) &&
570 time_before(jiffies, timeout))
571 cpu_relax();
572 if (!time_before(jiffies, timeout)) {
573 dev_err(mtd->dev.parent, "FIFO held data too long\n");
574 status = -EIO;
575 }
576 }
577
578
579 if (!read)
580 udelay(10);
581 host->ecc_buf[chip->ecc.steps - 1] =
582 readl(SLC_ECC(host->io_base));
583
584
585 dmaengine_terminate_all(host->dma_chan);
586
587 if (readl(SLC_STAT(host->io_base)) & SLCSTAT_DMA_FIFO ||
588 readl(SLC_TC(host->io_base))) {
589
590 dev_err(mtd->dev.parent, "DMA FIFO failure\n");
591 status = -EIO;
592 }
593
594
595 writel(readl(SLC_CTRL(host->io_base)) & ~SLCCTRL_DMA_START,
596 SLC_CTRL(host->io_base));
597 writel(readl(SLC_CFG(host->io_base)) &
598 ~(SLCCFG_DMA_DIR | SLCCFG_ECC_EN | SLCCFG_DMA_ECC |
599 SLCCFG_DMA_BURST), SLC_CFG(host->io_base));
600
601 if (!dma_mapped && read)
602 memcpy(buf, host->data_buf, mtd->writesize);
603
604 return status;
605}
606
607
608
609
610
611static int lpc32xx_nand_read_page_syndrome(struct nand_chip *chip, uint8_t *buf,
612 int oob_required, int page)
613{
614 struct mtd_info *mtd = nand_to_mtd(chip);
615 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
616 struct mtd_oob_region oobregion = { };
617 int stat, i, status, error;
618 uint8_t *oobecc, tmpecc[LPC32XX_ECC_SAVE_SIZE];
619
620
621 nand_read_page_op(chip, page, 0, NULL, 0);
622
623
624 status = lpc32xx_xfer(mtd, buf, chip->ecc.steps, 1);
625
626
627 chip->legacy.read_buf(chip, chip->oob_poi, mtd->oobsize);
628
629
630 lpc32xx_slc_ecc_copy(tmpecc, (uint32_t *) host->ecc_buf, chip->ecc.steps);
631
632
633 error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
634 if (error)
635 return error;
636
637 oobecc = chip->oob_poi + oobregion.offset;
638
639 for (i = 0; i < chip->ecc.steps; i++) {
640 stat = chip->ecc.correct(chip, buf, oobecc,
641 &tmpecc[i * chip->ecc.bytes]);
642 if (stat < 0)
643 mtd->ecc_stats.failed++;
644 else
645 mtd->ecc_stats.corrected += stat;
646
647 buf += chip->ecc.size;
648 oobecc += chip->ecc.bytes;
649 }
650
651 return status;
652}
653
654
655
656
657
658static int lpc32xx_nand_read_page_raw_syndrome(struct nand_chip *chip,
659 uint8_t *buf, int oob_required,
660 int page)
661{
662 struct mtd_info *mtd = nand_to_mtd(chip);
663
664
665 nand_read_page_op(chip, page, 0, NULL, 0);
666
667
668 chip->legacy.read_buf(chip, buf, chip->ecc.size * chip->ecc.steps);
669 chip->legacy.read_buf(chip, chip->oob_poi, mtd->oobsize);
670
671 return 0;
672}
673
674
675
676
677
678static int lpc32xx_nand_write_page_syndrome(struct nand_chip *chip,
679 const uint8_t *buf,
680 int oob_required, int page)
681{
682 struct mtd_info *mtd = nand_to_mtd(chip);
683 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
684 struct mtd_oob_region oobregion = { };
685 uint8_t *pb;
686 int error;
687
688 nand_prog_page_begin_op(chip, page, 0, NULL, 0);
689
690
691 error = lpc32xx_xfer(mtd, (uint8_t *)buf, chip->ecc.steps, 0);
692 if (error)
693 return error;
694
695
696
697
698
699 error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
700 if (error)
701 return error;
702
703 pb = chip->oob_poi + oobregion.offset;
704 lpc32xx_slc_ecc_copy(pb, (uint32_t *)host->ecc_buf, chip->ecc.steps);
705
706
707 chip->legacy.write_buf(chip, chip->oob_poi, mtd->oobsize);
708
709 return nand_prog_page_end_op(chip);
710}
711
712
713
714
715
716static int lpc32xx_nand_write_page_raw_syndrome(struct nand_chip *chip,
717 const uint8_t *buf,
718 int oob_required, int page)
719{
720 struct mtd_info *mtd = nand_to_mtd(chip);
721
722
723 nand_prog_page_begin_op(chip, page, 0, buf,
724 chip->ecc.size * chip->ecc.steps);
725 chip->legacy.write_buf(chip, chip->oob_poi, mtd->oobsize);
726
727 return nand_prog_page_end_op(chip);
728}
729
730static int lpc32xx_nand_dma_setup(struct lpc32xx_nand_host *host)
731{
732 struct mtd_info *mtd = nand_to_mtd(&host->nand_chip);
733 dma_cap_mask_t mask;
734
735 if (!host->pdata || !host->pdata->dma_filter) {
736 dev_err(mtd->dev.parent, "no DMA platform data\n");
737 return -ENOENT;
738 }
739
740 dma_cap_zero(mask);
741 dma_cap_set(DMA_SLAVE, mask);
742 host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter,
743 "nand-slc");
744 if (!host->dma_chan) {
745 dev_err(mtd->dev.parent, "Failed to request DMA channel\n");
746 return -EBUSY;
747 }
748
749 return 0;
750}
751
752static struct lpc32xx_nand_cfg_slc *lpc32xx_parse_dt(struct device *dev)
753{
754 struct lpc32xx_nand_cfg_slc *ncfg;
755 struct device_node *np = dev->of_node;
756
757 ncfg = devm_kzalloc(dev, sizeof(*ncfg), GFP_KERNEL);
758 if (!ncfg)
759 return NULL;
760
761 of_property_read_u32(np, "nxp,wdr-clks", &ncfg->wdr_clks);
762 of_property_read_u32(np, "nxp,wwidth", &ncfg->wwidth);
763 of_property_read_u32(np, "nxp,whold", &ncfg->whold);
764 of_property_read_u32(np, "nxp,wsetup", &ncfg->wsetup);
765 of_property_read_u32(np, "nxp,rdr-clks", &ncfg->rdr_clks);
766 of_property_read_u32(np, "nxp,rwidth", &ncfg->rwidth);
767 of_property_read_u32(np, "nxp,rhold", &ncfg->rhold);
768 of_property_read_u32(np, "nxp,rsetup", &ncfg->rsetup);
769
770 if (!ncfg->wdr_clks || !ncfg->wwidth || !ncfg->whold ||
771 !ncfg->wsetup || !ncfg->rdr_clks || !ncfg->rwidth ||
772 !ncfg->rhold || !ncfg->rsetup) {
773 dev_err(dev, "chip parameters not specified correctly\n");
774 return NULL;
775 }
776
777 ncfg->wp_gpio = of_get_named_gpio(np, "gpios", 0);
778
779 return ncfg;
780}
781
782static int lpc32xx_nand_attach_chip(struct nand_chip *chip)
783{
784 struct mtd_info *mtd = nand_to_mtd(chip);
785 struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
786
787
788 host->ecc_buf = (uint32_t *)(host->data_buf + LPC32XX_DMA_DATA_SIZE);
789
790
791
792
793
794
795 if (mtd->writesize <= 512)
796 mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
797
798
799 chip->ecc.size = 256;
800 chip->ecc.bytes = LPC32XX_SLC_DEV_ECC_BYTES;
801 chip->ecc.prepad = 0;
802 chip->ecc.postpad = 0;
803
804
805
806
807
808
809 if ((chip->bbt_options & NAND_BBT_USE_FLASH) &&
810 mtd->writesize <= 512) {
811 chip->bbt_td = &bbt_smallpage_main_descr;
812 chip->bbt_md = &bbt_smallpage_mirror_descr;
813 }
814
815 return 0;
816}
817
818static const struct nand_controller_ops lpc32xx_nand_controller_ops = {
819 .attach_chip = lpc32xx_nand_attach_chip,
820};
821
822
823
824
825static int lpc32xx_nand_probe(struct platform_device *pdev)
826{
827 struct lpc32xx_nand_host *host;
828 struct mtd_info *mtd;
829 struct nand_chip *chip;
830 struct resource *rc;
831 int res;
832
833
834 host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
835 if (!host)
836 return -ENOMEM;
837
838 rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
839 host->io_base = devm_ioremap_resource(&pdev->dev, rc);
840 if (IS_ERR(host->io_base))
841 return PTR_ERR(host->io_base);
842
843 host->io_base_dma = rc->start;
844 if (pdev->dev.of_node)
845 host->ncfg = lpc32xx_parse_dt(&pdev->dev);
846 if (!host->ncfg) {
847 dev_err(&pdev->dev,
848 "Missing or bad NAND config from device tree\n");
849 return -ENOENT;
850 }
851 if (host->ncfg->wp_gpio == -EPROBE_DEFER)
852 return -EPROBE_DEFER;
853 if (gpio_is_valid(host->ncfg->wp_gpio) && devm_gpio_request(&pdev->dev,
854 host->ncfg->wp_gpio, "NAND WP")) {
855 dev_err(&pdev->dev, "GPIO not available\n");
856 return -EBUSY;
857 }
858 lpc32xx_wp_disable(host);
859
860 host->pdata = dev_get_platdata(&pdev->dev);
861
862 chip = &host->nand_chip;
863 mtd = nand_to_mtd(chip);
864 nand_set_controller_data(chip, host);
865 nand_set_flash_node(chip, pdev->dev.of_node);
866 mtd->owner = THIS_MODULE;
867 mtd->dev.parent = &pdev->dev;
868
869
870 host->clk = devm_clk_get(&pdev->dev, NULL);
871 if (IS_ERR(host->clk)) {
872 dev_err(&pdev->dev, "Clock failure\n");
873 res = -ENOENT;
874 goto enable_wp;
875 }
876 res = clk_prepare_enable(host->clk);
877 if (res)
878 goto enable_wp;
879
880
881 chip->legacy.IO_ADDR_R = SLC_DATA(host->io_base);
882 chip->legacy.IO_ADDR_W = SLC_DATA(host->io_base);
883 chip->legacy.cmd_ctrl = lpc32xx_nand_cmd_ctrl;
884 chip->legacy.dev_ready = lpc32xx_nand_device_ready;
885 chip->legacy.chip_delay = 20;
886
887
888 lpc32xx_nand_setup(host);
889
890 platform_set_drvdata(pdev, host);
891
892
893 chip->ecc.mode = NAND_ECC_HW_SYNDROME;
894 chip->legacy.read_byte = lpc32xx_nand_read_byte;
895 chip->legacy.read_buf = lpc32xx_nand_read_buf;
896 chip->legacy.write_buf = lpc32xx_nand_write_buf;
897 chip->ecc.read_page_raw = lpc32xx_nand_read_page_raw_syndrome;
898 chip->ecc.read_page = lpc32xx_nand_read_page_syndrome;
899 chip->ecc.write_page_raw = lpc32xx_nand_write_page_raw_syndrome;
900 chip->ecc.write_page = lpc32xx_nand_write_page_syndrome;
901 chip->ecc.write_oob = lpc32xx_nand_write_oob_syndrome;
902 chip->ecc.read_oob = lpc32xx_nand_read_oob_syndrome;
903 chip->ecc.calculate = lpc32xx_nand_ecc_calculate;
904 chip->ecc.correct = nand_correct_data;
905 chip->ecc.strength = 1;
906 chip->ecc.hwctl = lpc32xx_nand_ecc_enable;
907
908
909
910
911
912 host->dma_buf_len = LPC32XX_DMA_DATA_SIZE + LPC32XX_ECC_SAVE_SIZE;
913 host->data_buf = devm_kzalloc(&pdev->dev, host->dma_buf_len,
914 GFP_KERNEL);
915 if (host->data_buf == NULL) {
916 res = -ENOMEM;
917 goto unprepare_clk;
918 }
919
920 res = lpc32xx_nand_dma_setup(host);
921 if (res) {
922 res = -EIO;
923 goto unprepare_clk;
924 }
925
926
927 chip->legacy.dummy_controller.ops = &lpc32xx_nand_controller_ops;
928 res = nand_scan(chip, 1);
929 if (res)
930 goto release_dma;
931
932 mtd->name = "nxp_lpc3220_slc";
933 res = mtd_device_register(mtd, host->ncfg->parts,
934 host->ncfg->num_parts);
935 if (res)
936 goto cleanup_nand;
937
938 return 0;
939
940cleanup_nand:
941 nand_cleanup(chip);
942release_dma:
943 dma_release_channel(host->dma_chan);
944unprepare_clk:
945 clk_disable_unprepare(host->clk);
946enable_wp:
947 lpc32xx_wp_enable(host);
948
949 return res;
950}
951
952
953
954
955static int lpc32xx_nand_remove(struct platform_device *pdev)
956{
957 uint32_t tmp;
958 struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
959
960 nand_release(&host->nand_chip);
961 dma_release_channel(host->dma_chan);
962
963
964 tmp = readl(SLC_CTRL(host->io_base));
965 tmp &= ~SLCCFG_CE_LOW;
966 writel(tmp, SLC_CTRL(host->io_base));
967
968 clk_disable_unprepare(host->clk);
969 lpc32xx_wp_enable(host);
970
971 return 0;
972}
973
974#ifdef CONFIG_PM
975static int lpc32xx_nand_resume(struct platform_device *pdev)
976{
977 struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
978 int ret;
979
980
981 ret = clk_prepare_enable(host->clk);
982 if (ret)
983 return ret;
984
985
986 lpc32xx_nand_setup(host);
987
988
989 lpc32xx_wp_disable(host);
990
991 return 0;
992}
993
994static int lpc32xx_nand_suspend(struct platform_device *pdev, pm_message_t pm)
995{
996 uint32_t tmp;
997 struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
998
999
1000 tmp = readl(SLC_CTRL(host->io_base));
1001 tmp &= ~SLCCFG_CE_LOW;
1002 writel(tmp, SLC_CTRL(host->io_base));
1003
1004
1005 lpc32xx_wp_enable(host);
1006
1007
1008 clk_disable_unprepare(host->clk);
1009
1010 return 0;
1011}
1012
1013#else
1014#define lpc32xx_nand_resume NULL
1015#define lpc32xx_nand_suspend NULL
1016#endif
1017
1018static const struct of_device_id lpc32xx_nand_match[] = {
1019 { .compatible = "nxp,lpc3220-slc" },
1020 { },
1021};
1022MODULE_DEVICE_TABLE(of, lpc32xx_nand_match);
1023
1024static struct platform_driver lpc32xx_nand_driver = {
1025 .probe = lpc32xx_nand_probe,
1026 .remove = lpc32xx_nand_remove,
1027 .resume = lpc32xx_nand_resume,
1028 .suspend = lpc32xx_nand_suspend,
1029 .driver = {
1030 .name = LPC32XX_MODNAME,
1031 .of_match_table = lpc32xx_nand_match,
1032 },
1033};
1034
1035module_platform_driver(lpc32xx_nand_driver);
1036
1037MODULE_LICENSE("GPL");
1038MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
1039MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
1040MODULE_DESCRIPTION("NAND driver for the NXP LPC32XX SLC controller");
1041