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25#include <linux/dma-mapping.h>
26#include <linux/slab.h>
27#include <linux/module.h>
28#include <linux/moduleparam.h>
29#include <linux/platform_device.h>
30#include <linux/of.h>
31#include <linux/of_device.h>
32#include <linux/of_gpio.h>
33#include <linux/of_mtd.h>
34#include <linux/mtd/mtd.h>
35#include <linux/mtd/nand.h>
36#include <linux/mtd/partitions.h>
37#include <linux/clk.h>
38#include <linux/delay.h>
39#include <linux/dmaengine.h>
40#include <linux/gpio.h>
41#include <linux/interrupt.h>
42#include <linux/io.h>
43
44#define NFC_REG_CTL 0x0000
45#define NFC_REG_ST 0x0004
46#define NFC_REG_INT 0x0008
47#define NFC_REG_TIMING_CTL 0x000C
48#define NFC_REG_TIMING_CFG 0x0010
49#define NFC_REG_ADDR_LOW 0x0014
50#define NFC_REG_ADDR_HIGH 0x0018
51#define NFC_REG_SECTOR_NUM 0x001C
52#define NFC_REG_CNT 0x0020
53#define NFC_REG_CMD 0x0024
54#define NFC_REG_RCMD_SET 0x0028
55#define NFC_REG_WCMD_SET 0x002C
56#define NFC_REG_IO_DATA 0x0030
57#define NFC_REG_ECC_CTL 0x0034
58#define NFC_REG_ECC_ST 0x0038
59#define NFC_REG_DEBUG 0x003C
60#define NFC_REG_ECC_ERR_CNT(x) ((0x0040 + (x)) & ~0x3)
61#define NFC_REG_USER_DATA(x) (0x0050 + ((x) * 4))
62#define NFC_REG_SPARE_AREA 0x00A0
63#define NFC_RAM0_BASE 0x0400
64#define NFC_RAM1_BASE 0x0800
65
66
67#define NFC_EN BIT(0)
68#define NFC_RESET BIT(1)
69#define NFC_BUS_WIDTH_MSK BIT(2)
70#define NFC_BUS_WIDTH_8 (0 << 2)
71#define NFC_BUS_WIDTH_16 (1 << 2)
72#define NFC_RB_SEL_MSK BIT(3)
73#define NFC_RB_SEL(x) ((x) << 3)
74#define NFC_CE_SEL_MSK GENMASK(26, 24)
75#define NFC_CE_SEL(x) ((x) << 24)
76#define NFC_CE_CTL BIT(6)
77#define NFC_PAGE_SHIFT_MSK GENMASK(11, 8)
78#define NFC_PAGE_SHIFT(x) (((x) < 10 ? 0 : (x) - 10) << 8)
79#define NFC_SAM BIT(12)
80#define NFC_RAM_METHOD BIT(14)
81#define NFC_DEBUG_CTL BIT(31)
82
83
84#define NFC_RB_B2R BIT(0)
85#define NFC_CMD_INT_FLAG BIT(1)
86#define NFC_DMA_INT_FLAG BIT(2)
87#define NFC_CMD_FIFO_STATUS BIT(3)
88#define NFC_STA BIT(4)
89#define NFC_NATCH_INT_FLAG BIT(5)
90#define NFC_RB_STATE(x) BIT(x + 8)
91
92
93#define NFC_B2R_INT_ENABLE BIT(0)
94#define NFC_CMD_INT_ENABLE BIT(1)
95#define NFC_DMA_INT_ENABLE BIT(2)
96#define NFC_INT_MASK (NFC_B2R_INT_ENABLE | \
97 NFC_CMD_INT_ENABLE | \
98 NFC_DMA_INT_ENABLE)
99
100
101#define NFC_TIMING_CTL_EDO BIT(8)
102
103
104#define NFC_TIMING_CFG(tWB, tADL, tWHR, tRHW, tCAD) \
105 (((tWB) & 0x3) | (((tADL) & 0x3) << 2) | \
106 (((tWHR) & 0x3) << 4) | (((tRHW) & 0x3) << 6) | \
107 (((tCAD) & 0x7) << 8))
108
109
110#define NFC_CMD_LOW_BYTE_MSK GENMASK(7, 0)
111#define NFC_CMD_HIGH_BYTE_MSK GENMASK(15, 8)
112#define NFC_CMD(x) (x)
113#define NFC_ADR_NUM_MSK GENMASK(18, 16)
114#define NFC_ADR_NUM(x) (((x) - 1) << 16)
115#define NFC_SEND_ADR BIT(19)
116#define NFC_ACCESS_DIR BIT(20)
117#define NFC_DATA_TRANS BIT(21)
118#define NFC_SEND_CMD1 BIT(22)
119#define NFC_WAIT_FLAG BIT(23)
120#define NFC_SEND_CMD2 BIT(24)
121#define NFC_SEQ BIT(25)
122#define NFC_DATA_SWAP_METHOD BIT(26)
123#define NFC_ROW_AUTO_INC BIT(27)
124#define NFC_SEND_CMD3 BIT(28)
125#define NFC_SEND_CMD4 BIT(29)
126#define NFC_CMD_TYPE_MSK GENMASK(31, 30)
127#define NFC_NORMAL_OP (0 << 30)
128#define NFC_ECC_OP (1 << 30)
129#define NFC_PAGE_OP (2 << 30)
130
131
132#define NFC_READ_CMD_MSK GENMASK(7, 0)
133#define NFC_RND_READ_CMD0_MSK GENMASK(15, 8)
134#define NFC_RND_READ_CMD1_MSK GENMASK(23, 16)
135
136
137#define NFC_PROGRAM_CMD_MSK GENMASK(7, 0)
138#define NFC_RND_WRITE_CMD_MSK GENMASK(15, 8)
139#define NFC_READ_CMD0_MSK GENMASK(23, 16)
140#define NFC_READ_CMD1_MSK GENMASK(31, 24)
141
142
143#define NFC_ECC_EN BIT(0)
144#define NFC_ECC_PIPELINE BIT(3)
145#define NFC_ECC_EXCEPTION BIT(4)
146#define NFC_ECC_BLOCK_SIZE_MSK BIT(5)
147#define NFC_RANDOM_EN BIT(9)
148#define NFC_RANDOM_DIRECTION BIT(10)
149#define NFC_ECC_MODE_MSK GENMASK(15, 12)
150#define NFC_ECC_MODE(x) ((x) << 12)
151#define NFC_RANDOM_SEED_MSK GENMASK(30, 16)
152#define NFC_RANDOM_SEED(x) ((x) << 16)
153
154
155#define NFC_ECC_ERR(x) BIT(x)
156#define NFC_ECC_PAT_FOUND(x) BIT(x + 16)
157#define NFC_ECC_ERR_CNT(b, x) (((x) >> ((b) * 8)) & 0xff)
158
159#define NFC_DEFAULT_TIMEOUT_MS 1000
160
161#define NFC_SRAM_SIZE 1024
162
163#define NFC_MAX_CS 7
164
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177
178enum sunxi_nand_rb_type {
179 RB_NONE,
180 RB_NATIVE,
181 RB_GPIO,
182};
183
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191struct sunxi_nand_rb {
192 enum sunxi_nand_rb_type type;
193 union {
194 int gpio;
195 int nativeid;
196 } info;
197};
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205struct sunxi_nand_chip_sel {
206 u8 cs;
207 struct sunxi_nand_rb rb;
208};
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217struct sunxi_nand_hw_ecc {
218 int mode;
219 struct nand_ecclayout layout;
220};
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234struct sunxi_nand_chip {
235 struct list_head node;
236 struct nand_chip nand;
237 struct mtd_info mtd;
238 unsigned long clk_rate;
239 u32 timing_cfg;
240 u32 timing_ctl;
241 int selected;
242 int nsels;
243 struct sunxi_nand_chip_sel sels[0];
244};
245
246static inline struct sunxi_nand_chip *to_sunxi_nand(struct nand_chip *nand)
247{
248 return container_of(nand, struct sunxi_nand_chip, nand);
249}
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266struct sunxi_nfc {
267 struct nand_hw_control controller;
268 struct device *dev;
269 void __iomem *regs;
270 struct clk *ahb_clk;
271 struct clk *mod_clk;
272 unsigned long assigned_cs;
273 unsigned long clk_rate;
274 struct list_head chips;
275 struct completion complete;
276};
277
278static inline struct sunxi_nfc *to_sunxi_nfc(struct nand_hw_control *ctrl)
279{
280 return container_of(ctrl, struct sunxi_nfc, controller);
281}
282
283static irqreturn_t sunxi_nfc_interrupt(int irq, void *dev_id)
284{
285 struct sunxi_nfc *nfc = dev_id;
286 u32 st = readl(nfc->regs + NFC_REG_ST);
287 u32 ien = readl(nfc->regs + NFC_REG_INT);
288
289 if (!(ien & st))
290 return IRQ_NONE;
291
292 if ((ien & st) == ien)
293 complete(&nfc->complete);
294
295 writel(st & NFC_INT_MASK, nfc->regs + NFC_REG_ST);
296 writel(~st & ien & NFC_INT_MASK, nfc->regs + NFC_REG_INT);
297
298 return IRQ_HANDLED;
299}
300
301static int sunxi_nfc_wait_int(struct sunxi_nfc *nfc, u32 flags,
302 unsigned int timeout_ms)
303{
304 init_completion(&nfc->complete);
305
306 writel(flags, nfc->regs + NFC_REG_INT);
307
308 if (!timeout_ms)
309 timeout_ms = NFC_DEFAULT_TIMEOUT_MS;
310
311 if (!wait_for_completion_timeout(&nfc->complete,
312 msecs_to_jiffies(timeout_ms))) {
313 dev_err(nfc->dev, "wait interrupt timedout\n");
314 return -ETIMEDOUT;
315 }
316
317 return 0;
318}
319
320static int sunxi_nfc_wait_cmd_fifo_empty(struct sunxi_nfc *nfc)
321{
322 unsigned long timeout = jiffies +
323 msecs_to_jiffies(NFC_DEFAULT_TIMEOUT_MS);
324
325 do {
326 if (!(readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS))
327 return 0;
328 } while (time_before(jiffies, timeout));
329
330 dev_err(nfc->dev, "wait for empty cmd FIFO timedout\n");
331 return -ETIMEDOUT;
332}
333
334static int sunxi_nfc_rst(struct sunxi_nfc *nfc)
335{
336 unsigned long timeout = jiffies +
337 msecs_to_jiffies(NFC_DEFAULT_TIMEOUT_MS);
338
339 writel(0, nfc->regs + NFC_REG_ECC_CTL);
340 writel(NFC_RESET, nfc->regs + NFC_REG_CTL);
341
342 do {
343 if (!(readl(nfc->regs + NFC_REG_CTL) & NFC_RESET))
344 return 0;
345 } while (time_before(jiffies, timeout));
346
347 dev_err(nfc->dev, "wait for NAND controller reset timedout\n");
348 return -ETIMEDOUT;
349}
350
351static int sunxi_nfc_dev_ready(struct mtd_info *mtd)
352{
353 struct nand_chip *nand = mtd->priv;
354 struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
355 struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
356 struct sunxi_nand_rb *rb;
357 unsigned long timeo = (sunxi_nand->nand.state == FL_ERASING ? 400 : 20);
358 int ret;
359
360 if (sunxi_nand->selected < 0)
361 return 0;
362
363 rb = &sunxi_nand->sels[sunxi_nand->selected].rb;
364
365 switch (rb->type) {
366 case RB_NATIVE:
367 ret = !!(readl(nfc->regs + NFC_REG_ST) &
368 NFC_RB_STATE(rb->info.nativeid));
369 if (ret)
370 break;
371
372 sunxi_nfc_wait_int(nfc, NFC_RB_B2R, timeo);
373 ret = !!(readl(nfc->regs + NFC_REG_ST) &
374 NFC_RB_STATE(rb->info.nativeid));
375 break;
376 case RB_GPIO:
377 ret = gpio_get_value(rb->info.gpio);
378 break;
379 case RB_NONE:
380 default:
381 ret = 0;
382 dev_err(nfc->dev, "cannot check R/B NAND status!\n");
383 break;
384 }
385
386 return ret;
387}
388
389static void sunxi_nfc_select_chip(struct mtd_info *mtd, int chip)
390{
391 struct nand_chip *nand = mtd->priv;
392 struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
393 struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
394 struct sunxi_nand_chip_sel *sel;
395 u32 ctl;
396
397 if (chip > 0 && chip >= sunxi_nand->nsels)
398 return;
399
400 if (chip == sunxi_nand->selected)
401 return;
402
403 ctl = readl(nfc->regs + NFC_REG_CTL) &
404 ~(NFC_PAGE_SHIFT_MSK | NFC_CE_SEL_MSK | NFC_RB_SEL_MSK | NFC_EN);
405
406 if (chip >= 0) {
407 sel = &sunxi_nand->sels[chip];
408
409 ctl |= NFC_CE_SEL(sel->cs) | NFC_EN |
410 NFC_PAGE_SHIFT(nand->page_shift - 10);
411 if (sel->rb.type == RB_NONE) {
412 nand->dev_ready = NULL;
413 } else {
414 nand->dev_ready = sunxi_nfc_dev_ready;
415 if (sel->rb.type == RB_NATIVE)
416 ctl |= NFC_RB_SEL(sel->rb.info.nativeid);
417 }
418
419 writel(mtd->writesize, nfc->regs + NFC_REG_SPARE_AREA);
420
421 if (nfc->clk_rate != sunxi_nand->clk_rate) {
422 clk_set_rate(nfc->mod_clk, sunxi_nand->clk_rate);
423 nfc->clk_rate = sunxi_nand->clk_rate;
424 }
425 }
426
427 writel(sunxi_nand->timing_ctl, nfc->regs + NFC_REG_TIMING_CTL);
428 writel(sunxi_nand->timing_cfg, nfc->regs + NFC_REG_TIMING_CFG);
429 writel(ctl, nfc->regs + NFC_REG_CTL);
430
431 sunxi_nand->selected = chip;
432}
433
434static void sunxi_nfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
435{
436 struct nand_chip *nand = mtd->priv;
437 struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
438 struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
439 int ret;
440 int cnt;
441 int offs = 0;
442 u32 tmp;
443
444 while (len > offs) {
445 cnt = min(len - offs, NFC_SRAM_SIZE);
446
447 ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
448 if (ret)
449 break;
450
451 writel(cnt, nfc->regs + NFC_REG_CNT);
452 tmp = NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD;
453 writel(tmp, nfc->regs + NFC_REG_CMD);
454
455 ret = sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
456 if (ret)
457 break;
458
459 if (buf)
460 memcpy_fromio(buf + offs, nfc->regs + NFC_RAM0_BASE,
461 cnt);
462 offs += cnt;
463 }
464}
465
466static void sunxi_nfc_write_buf(struct mtd_info *mtd, const uint8_t *buf,
467 int len)
468{
469 struct nand_chip *nand = mtd->priv;
470 struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
471 struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
472 int ret;
473 int cnt;
474 int offs = 0;
475 u32 tmp;
476
477 while (len > offs) {
478 cnt = min(len - offs, NFC_SRAM_SIZE);
479
480 ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
481 if (ret)
482 break;
483
484 writel(cnt, nfc->regs + NFC_REG_CNT);
485 memcpy_toio(nfc->regs + NFC_RAM0_BASE, buf + offs, cnt);
486 tmp = NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD |
487 NFC_ACCESS_DIR;
488 writel(tmp, nfc->regs + NFC_REG_CMD);
489
490 ret = sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
491 if (ret)
492 break;
493
494 offs += cnt;
495 }
496}
497
498static uint8_t sunxi_nfc_read_byte(struct mtd_info *mtd)
499{
500 uint8_t ret;
501
502 sunxi_nfc_read_buf(mtd, &ret, 1);
503
504 return ret;
505}
506
507static void sunxi_nfc_cmd_ctrl(struct mtd_info *mtd, int dat,
508 unsigned int ctrl)
509{
510 struct nand_chip *nand = mtd->priv;
511 struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
512 struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
513 int ret;
514 u32 tmp;
515
516 ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
517 if (ret)
518 return;
519
520 if (ctrl & NAND_CTRL_CHANGE) {
521 tmp = readl(nfc->regs + NFC_REG_CTL);
522 if (ctrl & NAND_NCE)
523 tmp |= NFC_CE_CTL;
524 else
525 tmp &= ~NFC_CE_CTL;
526 writel(tmp, nfc->regs + NFC_REG_CTL);
527 }
528
529 if (dat == NAND_CMD_NONE)
530 return;
531
532 if (ctrl & NAND_CLE) {
533 writel(NFC_SEND_CMD1 | dat, nfc->regs + NFC_REG_CMD);
534 } else {
535 writel(dat, nfc->regs + NFC_REG_ADDR_LOW);
536 writel(NFC_SEND_ADR, nfc->regs + NFC_REG_CMD);
537 }
538
539 sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
540}
541
542static void sunxi_nfc_hw_ecc_enable(struct mtd_info *mtd)
543{
544 struct nand_chip *nand = mtd->priv;
545 struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
546 struct sunxi_nand_hw_ecc *data = nand->ecc.priv;
547 u32 ecc_ctl;
548
549 ecc_ctl = readl(nfc->regs + NFC_REG_ECC_CTL);
550 ecc_ctl &= ~(NFC_ECC_MODE_MSK | NFC_ECC_PIPELINE |
551 NFC_ECC_BLOCK_SIZE_MSK);
552 ecc_ctl |= NFC_ECC_EN | NFC_ECC_MODE(data->mode) | NFC_ECC_EXCEPTION;
553
554 writel(ecc_ctl, nfc->regs + NFC_REG_ECC_CTL);
555}
556
557static void sunxi_nfc_hw_ecc_disable(struct mtd_info *mtd)
558{
559 struct nand_chip *nand = mtd->priv;
560 struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
561
562 writel(readl(nfc->regs + NFC_REG_ECC_CTL) & ~NFC_ECC_EN,
563 nfc->regs + NFC_REG_ECC_CTL);
564}
565
566static inline void sunxi_nfc_user_data_to_buf(u32 user_data, u8 *buf)
567{
568 buf[0] = user_data;
569 buf[1] = user_data >> 8;
570 buf[2] = user_data >> 16;
571 buf[3] = user_data >> 24;
572}
573
574static int sunxi_nfc_hw_ecc_read_chunk(struct mtd_info *mtd,
575 u8 *data, int data_off,
576 u8 *oob, int oob_off,
577 int *cur_off,
578 unsigned int *max_bitflips)
579{
580 struct nand_chip *nand = mtd->priv;
581 struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
582 struct nand_ecc_ctrl *ecc = &nand->ecc;
583 u32 status;
584 int ret;
585
586 if (*cur_off != data_off)
587 nand->cmdfunc(mtd, NAND_CMD_RNDOUT, data_off, -1);
588
589 sunxi_nfc_read_buf(mtd, NULL, ecc->size);
590
591 if (data_off + ecc->size != oob_off)
592 nand->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_off, -1);
593
594 ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
595 if (ret)
596 return ret;
597
598 writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | NFC_ECC_OP,
599 nfc->regs + NFC_REG_CMD);
600
601 ret = sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
602 if (ret)
603 return ret;
604
605 status = readl(nfc->regs + NFC_REG_ECC_ST);
606 ret = NFC_ECC_ERR_CNT(0, readl(nfc->regs + NFC_REG_ECC_ERR_CNT(0)));
607
608 memcpy_fromio(data, nfc->regs + NFC_RAM0_BASE, ecc->size);
609
610 nand->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_off, -1);
611 sunxi_nfc_read_buf(mtd, oob, ecc->bytes + 4);
612
613 if (status & NFC_ECC_ERR(0)) {
614 ret = nand_check_erased_ecc_chunk(data, ecc->size,
615 oob, ecc->bytes + 4,
616 NULL, 0, ecc->strength);
617 } else {
618
619
620
621
622 sunxi_nfc_user_data_to_buf(readl(nfc->regs + NFC_REG_USER_DATA(0)),
623 oob);
624 }
625
626 if (ret < 0) {
627 mtd->ecc_stats.failed++;
628 } else {
629 mtd->ecc_stats.corrected += ret;
630 *max_bitflips = max_t(unsigned int, *max_bitflips, ret);
631 }
632
633 *cur_off = oob_off + ecc->bytes + 4;
634
635 return 0;
636}
637
638static void sunxi_nfc_hw_ecc_read_extra_oob(struct mtd_info *mtd,
639 u8 *oob, int *cur_off)
640{
641 struct nand_chip *nand = mtd->priv;
642 struct nand_ecc_ctrl *ecc = &nand->ecc;
643 int offset = ((ecc->bytes + 4) * ecc->steps);
644 int len = mtd->oobsize - offset;
645
646 if (len <= 0)
647 return;
648
649 if (*cur_off != offset)
650 nand->cmdfunc(mtd, NAND_CMD_RNDOUT,
651 offset + mtd->writesize, -1);
652
653 sunxi_nfc_read_buf(mtd, oob + offset, len);
654
655 *cur_off = mtd->oobsize + mtd->writesize;
656}
657
658static inline u32 sunxi_nfc_buf_to_user_data(const u8 *buf)
659{
660 return buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
661}
662
663static int sunxi_nfc_hw_ecc_write_chunk(struct mtd_info *mtd,
664 const u8 *data, int data_off,
665 const u8 *oob, int oob_off,
666 int *cur_off)
667{
668 struct nand_chip *nand = mtd->priv;
669 struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
670 struct nand_ecc_ctrl *ecc = &nand->ecc;
671 int ret;
672
673 if (data_off != *cur_off)
674 nand->cmdfunc(mtd, NAND_CMD_RNDIN, data_off, -1);
675
676 sunxi_nfc_write_buf(mtd, data, ecc->size);
677
678
679 writel(sunxi_nfc_buf_to_user_data(oob),
680 nfc->regs + NFC_REG_USER_DATA(0));
681
682 if (data_off + ecc->size != oob_off)
683 nand->cmdfunc(mtd, NAND_CMD_RNDIN, oob_off, -1);
684
685 ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
686 if (ret)
687 return ret;
688
689 writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD |
690 NFC_ACCESS_DIR | NFC_ECC_OP,
691 nfc->regs + NFC_REG_CMD);
692
693 ret = sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
694 if (ret)
695 return ret;
696
697 *cur_off = oob_off + ecc->bytes + 4;
698
699 return 0;
700}
701
702static void sunxi_nfc_hw_ecc_write_extra_oob(struct mtd_info *mtd,
703 u8 *oob, int *cur_off)
704{
705 struct nand_chip *nand = mtd->priv;
706 struct nand_ecc_ctrl *ecc = &nand->ecc;
707 int offset = ((ecc->bytes + 4) * ecc->steps);
708 int len = mtd->oobsize - offset;
709
710 if (len <= 0)
711 return;
712
713 if (*cur_off != offset)
714 nand->cmdfunc(mtd, NAND_CMD_RNDIN,
715 offset + mtd->writesize, -1);
716
717 sunxi_nfc_write_buf(mtd, oob + offset, len);
718
719 *cur_off = mtd->oobsize + mtd->writesize;
720}
721
722static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd,
723 struct nand_chip *chip, uint8_t *buf,
724 int oob_required, int page)
725{
726 struct nand_ecc_ctrl *ecc = &chip->ecc;
727 unsigned int max_bitflips = 0;
728 int ret, i, cur_off = 0;
729
730 sunxi_nfc_hw_ecc_enable(mtd);
731
732 for (i = 0; i < ecc->steps; i++) {
733 int data_off = i * ecc->size;
734 int oob_off = i * (ecc->bytes + 4);
735 u8 *data = buf + data_off;
736 u8 *oob = chip->oob_poi + oob_off;
737
738 ret = sunxi_nfc_hw_ecc_read_chunk(mtd, data, data_off, oob,
739 oob_off + mtd->writesize,
740 &cur_off, &max_bitflips);
741 if (ret)
742 return ret;
743 }
744
745 if (oob_required)
746 sunxi_nfc_hw_ecc_read_extra_oob(mtd, chip->oob_poi, &cur_off);
747
748 sunxi_nfc_hw_ecc_disable(mtd);
749
750 return max_bitflips;
751}
752
753static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd,
754 struct nand_chip *chip,
755 const uint8_t *buf, int oob_required,
756 int page)
757{
758 struct nand_ecc_ctrl *ecc = &chip->ecc;
759 int ret, i, cur_off = 0;
760
761 sunxi_nfc_hw_ecc_enable(mtd);
762
763 for (i = 0; i < ecc->steps; i++) {
764 int data_off = i * ecc->size;
765 int oob_off = i * (ecc->bytes + 4);
766 const u8 *data = buf + data_off;
767 const u8 *oob = chip->oob_poi + oob_off;
768
769 ret = sunxi_nfc_hw_ecc_write_chunk(mtd, data, data_off, oob,
770 oob_off + mtd->writesize,
771 &cur_off);
772 if (ret)
773 return ret;
774 }
775
776 if (oob_required)
777 sunxi_nfc_hw_ecc_write_extra_oob(mtd, chip->oob_poi, &cur_off);
778
779 sunxi_nfc_hw_ecc_disable(mtd);
780
781 return 0;
782}
783
784static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd,
785 struct nand_chip *chip,
786 uint8_t *buf, int oob_required,
787 int page)
788{
789 struct nand_ecc_ctrl *ecc = &chip->ecc;
790 unsigned int max_bitflips = 0;
791 int ret, i, cur_off = 0;
792
793 sunxi_nfc_hw_ecc_enable(mtd);
794
795 for (i = 0; i < ecc->steps; i++) {
796 int data_off = i * (ecc->size + ecc->bytes + 4);
797 int oob_off = data_off + ecc->size;
798 u8 *data = buf + (i * ecc->size);
799 u8 *oob = chip->oob_poi + (i * (ecc->bytes + 4));
800
801 ret = sunxi_nfc_hw_ecc_read_chunk(mtd, data, data_off, oob,
802 oob_off, &cur_off,
803 &max_bitflips);
804 if (ret)
805 return ret;
806 }
807
808 if (oob_required)
809 sunxi_nfc_hw_ecc_read_extra_oob(mtd, chip->oob_poi, &cur_off);
810
811 sunxi_nfc_hw_ecc_disable(mtd);
812
813 return max_bitflips;
814}
815
816static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd,
817 struct nand_chip *chip,
818 const uint8_t *buf,
819 int oob_required, int page)
820{
821 struct nand_ecc_ctrl *ecc = &chip->ecc;
822 int ret, i, cur_off = 0;
823
824 sunxi_nfc_hw_ecc_enable(mtd);
825
826 for (i = 0; i < ecc->steps; i++) {
827 int data_off = i * (ecc->size + ecc->bytes + 4);
828 int oob_off = data_off + ecc->size;
829 const u8 *data = buf + (i * ecc->size);
830 const u8 *oob = chip->oob_poi + (i * (ecc->bytes + 4));
831
832 ret = sunxi_nfc_hw_ecc_write_chunk(mtd, data, data_off,
833 oob, oob_off, &cur_off);
834 if (ret)
835 return ret;
836 }
837
838 if (oob_required)
839 sunxi_nfc_hw_ecc_write_extra_oob(mtd, chip->oob_poi, &cur_off);
840
841 sunxi_nfc_hw_ecc_disable(mtd);
842
843 return 0;
844}
845
846static const s32 tWB_lut[] = {6, 12, 16, 20};
847static const s32 tRHW_lut[] = {4, 8, 12, 20};
848
849static int _sunxi_nand_lookup_timing(const s32 *lut, int lut_size, u32 duration,
850 u32 clk_period)
851{
852 u32 clk_cycles = DIV_ROUND_UP(duration, clk_period);
853 int i;
854
855 for (i = 0; i < lut_size; i++) {
856 if (clk_cycles <= lut[i])
857 return i;
858 }
859
860
861 return -EINVAL;
862}
863
864#define sunxi_nand_lookup_timing(l, p, c) \
865 _sunxi_nand_lookup_timing(l, ARRAY_SIZE(l), p, c)
866
867static int sunxi_nand_chip_set_timings(struct sunxi_nand_chip *chip,
868 const struct nand_sdr_timings *timings)
869{
870 struct sunxi_nfc *nfc = to_sunxi_nfc(chip->nand.controller);
871 u32 min_clk_period = 0;
872 s32 tWB, tADL, tWHR, tRHW, tCAD;
873
874
875 if (timings->tCLS_min > min_clk_period)
876 min_clk_period = timings->tCLS_min;
877
878
879 if (timings->tCLH_min > min_clk_period)
880 min_clk_period = timings->tCLH_min;
881
882
883 if (timings->tCS_min > min_clk_period)
884 min_clk_period = timings->tCS_min;
885
886
887 if (timings->tCH_min > min_clk_period)
888 min_clk_period = timings->tCH_min;
889
890
891 if (timings->tWP_min > min_clk_period)
892 min_clk_period = timings->tWP_min;
893
894
895 if (timings->tWH_min > min_clk_period)
896 min_clk_period = timings->tWH_min;
897
898
899 if (timings->tALS_min > min_clk_period)
900 min_clk_period = timings->tALS_min;
901
902
903 if (timings->tDS_min > min_clk_period)
904 min_clk_period = timings->tDS_min;
905
906
907 if (timings->tDH_min > min_clk_period)
908 min_clk_period = timings->tDH_min;
909
910
911 if (timings->tRR_min > (min_clk_period * 3))
912 min_clk_period = DIV_ROUND_UP(timings->tRR_min, 3);
913
914
915 if (timings->tALH_min > min_clk_period)
916 min_clk_period = timings->tALH_min;
917
918
919 if (timings->tRP_min > min_clk_period)
920 min_clk_period = timings->tRP_min;
921
922
923 if (timings->tREH_min > min_clk_period)
924 min_clk_period = timings->tREH_min;
925
926
927 if (timings->tRC_min > (min_clk_period * 2))
928 min_clk_period = DIV_ROUND_UP(timings->tRC_min, 2);
929
930
931 if (timings->tWC_min > (min_clk_period * 2))
932 min_clk_period = DIV_ROUND_UP(timings->tWC_min, 2);
933
934
935 tWB = sunxi_nand_lookup_timing(tWB_lut, timings->tWB_max,
936 min_clk_period);
937 if (tWB < 0) {
938 dev_err(nfc->dev, "unsupported tWB\n");
939 return tWB;
940 }
941
942 tADL = DIV_ROUND_UP(timings->tADL_min, min_clk_period) >> 3;
943 if (tADL > 3) {
944 dev_err(nfc->dev, "unsupported tADL\n");
945 return -EINVAL;
946 }
947
948 tWHR = DIV_ROUND_UP(timings->tWHR_min, min_clk_period) >> 3;
949 if (tWHR > 3) {
950 dev_err(nfc->dev, "unsupported tWHR\n");
951 return -EINVAL;
952 }
953
954 tRHW = sunxi_nand_lookup_timing(tRHW_lut, timings->tRHW_min,
955 min_clk_period);
956 if (tRHW < 0) {
957 dev_err(nfc->dev, "unsupported tRHW\n");
958 return tRHW;
959 }
960
961
962
963
964
965 tCAD = 0x7;
966
967
968 chip->timing_cfg = NFC_TIMING_CFG(tWB, tADL, tWHR, tRHW, tCAD);
969
970
971
972
973
974
975 chip->timing_ctl = (timings->tRC_min < 30000) ? NFC_TIMING_CTL_EDO : 0;
976
977
978 min_clk_period = DIV_ROUND_UP(min_clk_period, 1000);
979
980
981
982
983
984
985
986 chip->clk_rate = (2 * NSEC_PER_SEC) / min_clk_period;
987
988 return 0;
989}
990
991static int sunxi_nand_chip_init_timings(struct sunxi_nand_chip *chip,
992 struct device_node *np)
993{
994 const struct nand_sdr_timings *timings;
995 int ret;
996 int mode;
997
998 mode = onfi_get_async_timing_mode(&chip->nand);
999 if (mode == ONFI_TIMING_MODE_UNKNOWN) {
1000 mode = chip->nand.onfi_timing_mode_default;
1001 } else {
1002 uint8_t feature[ONFI_SUBFEATURE_PARAM_LEN] = {};
1003 int i;
1004
1005 mode = fls(mode) - 1;
1006 if (mode < 0)
1007 mode = 0;
1008
1009 feature[0] = mode;
1010 for (i = 0; i < chip->nsels; i++) {
1011 chip->nand.select_chip(&chip->mtd, i);
1012 ret = chip->nand.onfi_set_features(&chip->mtd,
1013 &chip->nand,
1014 ONFI_FEATURE_ADDR_TIMING_MODE,
1015 feature);
1016 chip->nand.select_chip(&chip->mtd, -1);
1017 if (ret)
1018 return ret;
1019 }
1020 }
1021
1022 timings = onfi_async_timing_mode_to_sdr_timings(mode);
1023 if (IS_ERR(timings))
1024 return PTR_ERR(timings);
1025
1026 return sunxi_nand_chip_set_timings(chip, timings);
1027}
1028
1029static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
1030 struct nand_ecc_ctrl *ecc,
1031 struct device_node *np)
1032{
1033 static const u8 strengths[] = { 16, 24, 28, 32, 40, 48, 56, 60, 64 };
1034 struct nand_chip *nand = mtd->priv;
1035 struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
1036 struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
1037 struct sunxi_nand_hw_ecc *data;
1038 struct nand_ecclayout *layout;
1039 int nsectors;
1040 int ret;
1041 int i;
1042
1043 data = kzalloc(sizeof(*data), GFP_KERNEL);
1044 if (!data)
1045 return -ENOMEM;
1046
1047
1048 for (i = 0; i < ARRAY_SIZE(strengths); i++) {
1049 if (ecc->strength <= strengths[i])
1050 break;
1051 }
1052
1053 if (i >= ARRAY_SIZE(strengths)) {
1054 dev_err(nfc->dev, "unsupported strength\n");
1055 ret = -ENOTSUPP;
1056 goto err;
1057 }
1058
1059 data->mode = i;
1060
1061
1062 ecc->bytes = DIV_ROUND_UP(ecc->strength * fls(8 * 1024), 8);
1063
1064
1065 ecc->bytes = ALIGN(ecc->bytes, 2);
1066
1067 layout = &data->layout;
1068 nsectors = mtd->writesize / ecc->size;
1069
1070 if (mtd->oobsize < ((ecc->bytes + 4) * nsectors)) {
1071 ret = -EINVAL;
1072 goto err;
1073 }
1074
1075 layout->eccbytes = (ecc->bytes * nsectors);
1076
1077 ecc->layout = layout;
1078 ecc->priv = data;
1079
1080 return 0;
1081
1082err:
1083 kfree(data);
1084
1085 return ret;
1086}
1087
1088static void sunxi_nand_hw_common_ecc_ctrl_cleanup(struct nand_ecc_ctrl *ecc)
1089{
1090 kfree(ecc->priv);
1091}
1092
1093static int sunxi_nand_hw_ecc_ctrl_init(struct mtd_info *mtd,
1094 struct nand_ecc_ctrl *ecc,
1095 struct device_node *np)
1096{
1097 struct nand_ecclayout *layout;
1098 int nsectors;
1099 int i, j;
1100 int ret;
1101
1102 ret = sunxi_nand_hw_common_ecc_ctrl_init(mtd, ecc, np);
1103 if (ret)
1104 return ret;
1105
1106 ecc->read_page = sunxi_nfc_hw_ecc_read_page;
1107 ecc->write_page = sunxi_nfc_hw_ecc_write_page;
1108 layout = ecc->layout;
1109 nsectors = mtd->writesize / ecc->size;
1110
1111 for (i = 0; i < nsectors; i++) {
1112 if (i) {
1113 layout->oobfree[i].offset =
1114 layout->oobfree[i - 1].offset +
1115 layout->oobfree[i - 1].length +
1116 ecc->bytes;
1117 layout->oobfree[i].length = 4;
1118 } else {
1119
1120
1121
1122
1123
1124 layout->oobfree[i].length = 2;
1125 layout->oobfree[i].offset = 2;
1126 }
1127
1128 for (j = 0; j < ecc->bytes; j++)
1129 layout->eccpos[(ecc->bytes * i) + j] =
1130 layout->oobfree[i].offset +
1131 layout->oobfree[i].length + j;
1132 }
1133
1134 if (mtd->oobsize > (ecc->bytes + 4) * nsectors) {
1135 layout->oobfree[nsectors].offset =
1136 layout->oobfree[nsectors - 1].offset +
1137 layout->oobfree[nsectors - 1].length +
1138 ecc->bytes;
1139 layout->oobfree[nsectors].length = mtd->oobsize -
1140 ((ecc->bytes + 4) * nsectors);
1141 }
1142
1143 return 0;
1144}
1145
1146static int sunxi_nand_hw_syndrome_ecc_ctrl_init(struct mtd_info *mtd,
1147 struct nand_ecc_ctrl *ecc,
1148 struct device_node *np)
1149{
1150 struct nand_ecclayout *layout;
1151 int nsectors;
1152 int i;
1153 int ret;
1154
1155 ret = sunxi_nand_hw_common_ecc_ctrl_init(mtd, ecc, np);
1156 if (ret)
1157 return ret;
1158
1159 ecc->prepad = 4;
1160 ecc->read_page = sunxi_nfc_hw_syndrome_ecc_read_page;
1161 ecc->write_page = sunxi_nfc_hw_syndrome_ecc_write_page;
1162
1163 layout = ecc->layout;
1164 nsectors = mtd->writesize / ecc->size;
1165
1166 for (i = 0; i < (ecc->bytes * nsectors); i++)
1167 layout->eccpos[i] = i;
1168
1169 layout->oobfree[0].length = mtd->oobsize - i;
1170 layout->oobfree[0].offset = i;
1171
1172 return 0;
1173}
1174
1175static void sunxi_nand_ecc_cleanup(struct nand_ecc_ctrl *ecc)
1176{
1177 switch (ecc->mode) {
1178 case NAND_ECC_HW:
1179 case NAND_ECC_HW_SYNDROME:
1180 sunxi_nand_hw_common_ecc_ctrl_cleanup(ecc);
1181 break;
1182 case NAND_ECC_NONE:
1183 kfree(ecc->layout);
1184 default:
1185 break;
1186 }
1187}
1188
1189static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
1190 struct device_node *np)
1191{
1192 struct nand_chip *nand = mtd->priv;
1193 int ret;
1194
1195 if (!ecc->size) {
1196 ecc->size = nand->ecc_step_ds;
1197 ecc->strength = nand->ecc_strength_ds;
1198 }
1199
1200 if (!ecc->size || !ecc->strength)
1201 return -EINVAL;
1202
1203 switch (ecc->mode) {
1204 case NAND_ECC_SOFT_BCH:
1205 break;
1206 case NAND_ECC_HW:
1207 ret = sunxi_nand_hw_ecc_ctrl_init(mtd, ecc, np);
1208 if (ret)
1209 return ret;
1210 break;
1211 case NAND_ECC_HW_SYNDROME:
1212 ret = sunxi_nand_hw_syndrome_ecc_ctrl_init(mtd, ecc, np);
1213 if (ret)
1214 return ret;
1215 break;
1216 case NAND_ECC_NONE:
1217 ecc->layout = kzalloc(sizeof(*ecc->layout), GFP_KERNEL);
1218 if (!ecc->layout)
1219 return -ENOMEM;
1220 ecc->layout->oobfree[0].length = mtd->oobsize;
1221 case NAND_ECC_SOFT:
1222 break;
1223 default:
1224 return -EINVAL;
1225 }
1226
1227 return 0;
1228}
1229
1230static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
1231 struct device_node *np)
1232{
1233 const struct nand_sdr_timings *timings;
1234 struct sunxi_nand_chip *chip;
1235 struct mtd_part_parser_data ppdata;
1236 struct mtd_info *mtd;
1237 struct nand_chip *nand;
1238 int nsels;
1239 int ret;
1240 int i;
1241 u32 tmp;
1242
1243 if (!of_get_property(np, "reg", &nsels))
1244 return -EINVAL;
1245
1246 nsels /= sizeof(u32);
1247 if (!nsels) {
1248 dev_err(dev, "invalid reg property size\n");
1249 return -EINVAL;
1250 }
1251
1252 chip = devm_kzalloc(dev,
1253 sizeof(*chip) +
1254 (nsels * sizeof(struct sunxi_nand_chip_sel)),
1255 GFP_KERNEL);
1256 if (!chip) {
1257 dev_err(dev, "could not allocate chip\n");
1258 return -ENOMEM;
1259 }
1260
1261 chip->nsels = nsels;
1262 chip->selected = -1;
1263
1264 for (i = 0; i < nsels; i++) {
1265 ret = of_property_read_u32_index(np, "reg", i, &tmp);
1266 if (ret) {
1267 dev_err(dev, "could not retrieve reg property: %d\n",
1268 ret);
1269 return ret;
1270 }
1271
1272 if (tmp > NFC_MAX_CS) {
1273 dev_err(dev,
1274 "invalid reg value: %u (max CS = 7)\n",
1275 tmp);
1276 return -EINVAL;
1277 }
1278
1279 if (test_and_set_bit(tmp, &nfc->assigned_cs)) {
1280 dev_err(dev, "CS %d already assigned\n", tmp);
1281 return -EINVAL;
1282 }
1283
1284 chip->sels[i].cs = tmp;
1285
1286 if (!of_property_read_u32_index(np, "allwinner,rb", i, &tmp) &&
1287 tmp < 2) {
1288 chip->sels[i].rb.type = RB_NATIVE;
1289 chip->sels[i].rb.info.nativeid = tmp;
1290 } else {
1291 ret = of_get_named_gpio(np, "rb-gpios", i);
1292 if (ret >= 0) {
1293 tmp = ret;
1294 chip->sels[i].rb.type = RB_GPIO;
1295 chip->sels[i].rb.info.gpio = tmp;
1296 ret = devm_gpio_request(dev, tmp, "nand-rb");
1297 if (ret)
1298 return ret;
1299
1300 ret = gpio_direction_input(tmp);
1301 if (ret)
1302 return ret;
1303 } else {
1304 chip->sels[i].rb.type = RB_NONE;
1305 }
1306 }
1307 }
1308
1309 timings = onfi_async_timing_mode_to_sdr_timings(0);
1310 if (IS_ERR(timings)) {
1311 ret = PTR_ERR(timings);
1312 dev_err(dev,
1313 "could not retrieve timings for ONFI mode 0: %d\n",
1314 ret);
1315 return ret;
1316 }
1317
1318 ret = sunxi_nand_chip_set_timings(chip, timings);
1319 if (ret) {
1320 dev_err(dev, "could not configure chip timings: %d\n", ret);
1321 return ret;
1322 }
1323
1324 nand = &chip->nand;
1325
1326 nand->chip_delay = 200;
1327 nand->controller = &nfc->controller;
1328
1329
1330
1331
1332 nand->ecc.mode = NAND_ECC_HW;
1333 nand->flash_node = np;
1334 nand->select_chip = sunxi_nfc_select_chip;
1335 nand->cmd_ctrl = sunxi_nfc_cmd_ctrl;
1336 nand->read_buf = sunxi_nfc_read_buf;
1337 nand->write_buf = sunxi_nfc_write_buf;
1338 nand->read_byte = sunxi_nfc_read_byte;
1339
1340 mtd = &chip->mtd;
1341 mtd->dev.parent = dev;
1342 mtd->priv = nand;
1343
1344 ret = nand_scan_ident(mtd, nsels, NULL);
1345 if (ret)
1346 return ret;
1347
1348 if (nand->bbt_options & NAND_BBT_USE_FLASH)
1349 nand->bbt_options |= NAND_BBT_NO_OOB;
1350
1351 ret = sunxi_nand_chip_init_timings(chip, np);
1352 if (ret) {
1353 dev_err(dev, "could not configure chip timings: %d\n", ret);
1354 return ret;
1355 }
1356
1357 ret = sunxi_nand_ecc_init(mtd, &nand->ecc, np);
1358 if (ret) {
1359 dev_err(dev, "ECC init failed: %d\n", ret);
1360 return ret;
1361 }
1362
1363 ret = nand_scan_tail(mtd);
1364 if (ret) {
1365 dev_err(dev, "nand_scan_tail failed: %d\n", ret);
1366 return ret;
1367 }
1368
1369 ppdata.of_node = np;
1370 ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
1371 if (ret) {
1372 dev_err(dev, "failed to register mtd device: %d\n", ret);
1373 nand_release(mtd);
1374 return ret;
1375 }
1376
1377 list_add_tail(&chip->node, &nfc->chips);
1378
1379 return 0;
1380}
1381
1382static int sunxi_nand_chips_init(struct device *dev, struct sunxi_nfc *nfc)
1383{
1384 struct device_node *np = dev->of_node;
1385 struct device_node *nand_np;
1386 int nchips = of_get_child_count(np);
1387 int ret;
1388
1389 if (nchips > 8) {
1390 dev_err(dev, "too many NAND chips: %d (max = 8)\n", nchips);
1391 return -EINVAL;
1392 }
1393
1394 for_each_child_of_node(np, nand_np) {
1395 ret = sunxi_nand_chip_init(dev, nfc, nand_np);
1396 if (ret)
1397 return ret;
1398 }
1399
1400 return 0;
1401}
1402
1403static void sunxi_nand_chips_cleanup(struct sunxi_nfc *nfc)
1404{
1405 struct sunxi_nand_chip *chip;
1406
1407 while (!list_empty(&nfc->chips)) {
1408 chip = list_first_entry(&nfc->chips, struct sunxi_nand_chip,
1409 node);
1410 nand_release(&chip->mtd);
1411 sunxi_nand_ecc_cleanup(&chip->nand.ecc);
1412 list_del(&chip->node);
1413 }
1414}
1415
1416static int sunxi_nfc_probe(struct platform_device *pdev)
1417{
1418 struct device *dev = &pdev->dev;
1419 struct resource *r;
1420 struct sunxi_nfc *nfc;
1421 int irq;
1422 int ret;
1423
1424 nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
1425 if (!nfc)
1426 return -ENOMEM;
1427
1428 nfc->dev = dev;
1429 spin_lock_init(&nfc->controller.lock);
1430 init_waitqueue_head(&nfc->controller.wq);
1431 INIT_LIST_HEAD(&nfc->chips);
1432
1433 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1434 nfc->regs = devm_ioremap_resource(dev, r);
1435 if (IS_ERR(nfc->regs))
1436 return PTR_ERR(nfc->regs);
1437
1438 irq = platform_get_irq(pdev, 0);
1439 if (irq < 0) {
1440 dev_err(dev, "failed to retrieve irq\n");
1441 return irq;
1442 }
1443
1444 nfc->ahb_clk = devm_clk_get(dev, "ahb");
1445 if (IS_ERR(nfc->ahb_clk)) {
1446 dev_err(dev, "failed to retrieve ahb clk\n");
1447 return PTR_ERR(nfc->ahb_clk);
1448 }
1449
1450 ret = clk_prepare_enable(nfc->ahb_clk);
1451 if (ret)
1452 return ret;
1453
1454 nfc->mod_clk = devm_clk_get(dev, "mod");
1455 if (IS_ERR(nfc->mod_clk)) {
1456 dev_err(dev, "failed to retrieve mod clk\n");
1457 ret = PTR_ERR(nfc->mod_clk);
1458 goto out_ahb_clk_unprepare;
1459 }
1460
1461 ret = clk_prepare_enable(nfc->mod_clk);
1462 if (ret)
1463 goto out_ahb_clk_unprepare;
1464
1465 ret = sunxi_nfc_rst(nfc);
1466 if (ret)
1467 goto out_mod_clk_unprepare;
1468
1469 writel(0, nfc->regs + NFC_REG_INT);
1470 ret = devm_request_irq(dev, irq, sunxi_nfc_interrupt,
1471 0, "sunxi-nand", nfc);
1472 if (ret)
1473 goto out_mod_clk_unprepare;
1474
1475 platform_set_drvdata(pdev, nfc);
1476
1477 ret = sunxi_nand_chips_init(dev, nfc);
1478 if (ret) {
1479 dev_err(dev, "failed to init nand chips\n");
1480 goto out_mod_clk_unprepare;
1481 }
1482
1483 return 0;
1484
1485out_mod_clk_unprepare:
1486 clk_disable_unprepare(nfc->mod_clk);
1487out_ahb_clk_unprepare:
1488 clk_disable_unprepare(nfc->ahb_clk);
1489
1490 return ret;
1491}
1492
1493static int sunxi_nfc_remove(struct platform_device *pdev)
1494{
1495 struct sunxi_nfc *nfc = platform_get_drvdata(pdev);
1496
1497 sunxi_nand_chips_cleanup(nfc);
1498
1499 return 0;
1500}
1501
1502static const struct of_device_id sunxi_nfc_ids[] = {
1503 { .compatible = "allwinner,sun4i-a10-nand" },
1504 { }
1505};
1506MODULE_DEVICE_TABLE(of, sunxi_nfc_ids);
1507
1508static struct platform_driver sunxi_nfc_driver = {
1509 .driver = {
1510 .name = "sunxi_nand",
1511 .of_match_table = sunxi_nfc_ids,
1512 },
1513 .probe = sunxi_nfc_probe,
1514 .remove = sunxi_nfc_remove,
1515};
1516module_platform_driver(sunxi_nfc_driver);
1517
1518MODULE_LICENSE("GPL v2");
1519MODULE_AUTHOR("Boris BREZILLON");
1520MODULE_DESCRIPTION("Allwinner NAND Flash Controller driver");
1521MODULE_ALIAS("platform:sunxi_nand");
1522
