2 * (C) Copyright 2004-2008 Texas Instruments, <www.ti.com>
3 * Rohit Choraria <rohitkc@ti.com>
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/errno.h>
11 #include <asm/arch/mem.h>
12 #include <linux/mtd/omap_gpmc.h>
13 #include <linux/mtd/nand_ecc.h>
14 #include <linux/bch.h>
15 #include <linux/compiler.h>
17 #include <linux/mtd/omap_elm.h>
19 #define BADBLOCK_MARKER_LENGTH 2
20 #define SECTOR_BYTES 512
21 #define ECCCLEAR (0x1 << 8)
22 #define ECCRESULTREG1 (0x1 << 0)
23 /* 4 bit padding to make byte aligned, 56 = 52 + 4 */
24 #define BCH4_BIT_PAD 4
27 static u8 bch8_polynomial[] = {0xef, 0x51, 0x2e, 0x09, 0xed, 0x93, 0x9a, 0xc2,
28 0x97, 0x79, 0xe5, 0x24, 0xb5};
31 static __maybe_unused struct nand_ecclayout omap_ecclayout;
34 * omap_nand_hwcontrol - Set the address pointers corretly for the
35 * following address/data/command operation
37 static void omap_nand_hwcontrol(struct mtd_info *mtd, int32_t cmd,
40 register struct nand_chip *this = mtd->priv;
43 * Point the IO_ADDR to DATA and ADDRESS registers instead
47 case NAND_CTRL_CHANGE | NAND_CTRL_CLE:
48 this->IO_ADDR_W = (void __iomem *)&gpmc_cfg->cs[cs].nand_cmd;
50 case NAND_CTRL_CHANGE | NAND_CTRL_ALE:
51 this->IO_ADDR_W = (void __iomem *)&gpmc_cfg->cs[cs].nand_adr;
53 case NAND_CTRL_CHANGE | NAND_NCE:
54 this->IO_ADDR_W = (void __iomem *)&gpmc_cfg->cs[cs].nand_dat;
58 if (cmd != NAND_CMD_NONE)
59 writeb(cmd, this->IO_ADDR_W);
62 #ifdef CONFIG_SPL_BUILD
63 /* Check wait pin as dev ready indicator */
64 int omap_spl_dev_ready(struct mtd_info *mtd)
66 return gpmc_cfg->status & (1 << 8);
72 * gen_true_ecc - This function will generate true ECC value, which
73 * can be used when correcting data read from NAND flash memory core
75 * @ecc_buf: buffer to store ecc code
77 * @return: re-formatted ECC value
79 static uint32_t gen_true_ecc(uint8_t *ecc_buf)
81 return ecc_buf[0] | (ecc_buf[1] << 16) | ((ecc_buf[2] & 0xF0) << 20) |
82 ((ecc_buf[2] & 0x0F) << 8);
86 * omap_correct_data - Compares the ecc read from nand spare area with ECC
87 * registers values and corrects one bit error if it has occured
88 * Further details can be had from OMAP TRM and the following selected links:
89 * http://en.wikipedia.org/wiki/Hamming_code
90 * http://www.cs.utexas.edu/users/plaxton/c/337/05f/slides/ErrorCorrection-4.pdf
92 * @mtd: MTD device structure
94 * @read_ecc: ecc read from nand flash
95 * @calc_ecc: ecc read from ECC registers
97 * @return 0 if data is OK or corrected, else returns -1
99 static int __maybe_unused omap_correct_data(struct mtd_info *mtd, uint8_t *dat,
100 uint8_t *read_ecc, uint8_t *calc_ecc)
102 uint32_t orig_ecc, new_ecc, res, hm;
103 uint16_t parity_bits, byte;
106 /* Regenerate the orginal ECC */
107 orig_ecc = gen_true_ecc(read_ecc);
108 new_ecc = gen_true_ecc(calc_ecc);
109 /* Get the XOR of real ecc */
110 res = orig_ecc ^ new_ecc;
112 /* Get the hamming width */
114 /* Single bit errors can be corrected! */
116 /* Correctable data! */
117 parity_bits = res >> 16;
118 bit = (parity_bits & 0x7);
119 byte = (parity_bits >> 3) & 0x1FF;
120 /* Flip the bit to correct */
121 dat[byte] ^= (0x1 << bit);
122 } else if (hm == 1) {
123 printf("Error: Ecc is wrong\n");
124 /* ECC itself is corrupted */
128 * hm distance != parity pairs OR one, could mean 2 bit
129 * error OR potentially be on a blank page..
130 * orig_ecc: contains spare area data from nand flash.
131 * new_ecc: generated ecc while reading data area.
132 * Note: if the ecc = 0, all data bits from which it was
133 * generated are 0xFF.
134 * The 3 byte(24 bits) ecc is generated per 512byte
135 * chunk of a page. If orig_ecc(from spare area)
136 * is 0xFF && new_ecc(computed now from data area)=0x0,
137 * this means that data area is 0xFF and spare area is
138 * 0xFF. A sure sign of a erased page!
140 if ((orig_ecc == 0x0FFF0FFF) && (new_ecc == 0x00000000))
142 printf("Error: Bad compare! failed\n");
143 /* detected 2 bit error */
151 * Driver configurations
153 struct omap_nand_info {
154 struct bch_control *control;
155 enum omap_ecc ecc_scheme;
159 * This can be a single instance cause all current users have only one NAND
160 * with nearly the same setup (BCH8, some with ELM and others with sw BCH
162 * When some users with other BCH strength will exists this have to change!
164 static __maybe_unused struct omap_nand_info omap_nand_info = {
169 * omap_reverse_list - re-orders list elements in reverse order [internal]
170 * @list: pointer to start of list
171 * @length: length of list
173 void omap_reverse_list(u8 *list, unsigned int length)
176 unsigned int half_length = length / 2;
178 for (i = 0, j = length - 1; i < half_length; i++, j--) {
186 * omap_enable_hwecc - configures GPMC as per ECC scheme before read/write
187 * @mtd: MTD device structure
188 * @mode: Read/Write mode
191 static void omap_enable_hwecc(struct mtd_info *mtd, int32_t mode)
193 struct nand_chip *nand = mtd->priv;
194 struct omap_nand_info *info = nand->priv;
195 unsigned int dev_width = (nand->options & NAND_BUSWIDTH_16) ? 1 : 0;
196 unsigned int ecc_algo = 0;
197 unsigned int bch_type = 0;
198 unsigned int eccsize1 = 0x00, eccsize0 = 0x00, bch_wrapmode = 0x00;
199 u32 ecc_size_config_val = 0;
200 u32 ecc_config_val = 0;
202 /* configure GPMC for specific ecc-scheme */
203 switch (info->ecc_scheme) {
204 case OMAP_ECC_HAM1_CODE_SW:
206 case OMAP_ECC_HAM1_CODE_HW:
213 case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
214 case OMAP_ECC_BCH8_CODE_HW:
217 if (mode == NAND_ECC_WRITE) {
219 eccsize0 = 0; /* extra bits in nibbles per sector */
220 eccsize1 = 28; /* OOB bits in nibbles per sector */
223 eccsize0 = 26; /* ECC bits in nibbles per sector */
224 eccsize1 = 2; /* non-ECC bits in nibbles per sector */
230 /* Clear ecc and enable bits */
231 writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control);
232 /* Configure ecc size for BCH */
233 ecc_size_config_val = (eccsize1 << 22) | (eccsize0 << 12);
234 writel(ecc_size_config_val, &gpmc_cfg->ecc_size_config);
236 /* Configure device details for BCH engine */
237 ecc_config_val = ((ecc_algo << 16) | /* HAM1 | BCHx */
238 (bch_type << 12) | /* BCH4/BCH8/BCH16 */
239 (bch_wrapmode << 8) | /* wrap mode */
240 (dev_width << 7) | /* bus width */
241 (0x0 << 4) | /* number of sectors */
242 (cs << 1) | /* ECC CS */
243 (0x1)); /* enable ECC */
244 writel(ecc_config_val, &gpmc_cfg->ecc_config);
248 * omap_calculate_ecc - Read ECC result
249 * @mtd: MTD structure
251 * @ecc_code: ecc_code buffer
252 * Using noninverted ECC can be considered ugly since writing a blank
253 * page ie. padding will clear the ECC bytes. This is no problem as
254 * long nobody is trying to write data on the seemingly unused page.
255 * Reading an erased page will produce an ECC mismatch between
256 * generated and read ECC bytes that has to be dealt with separately.
257 * E.g. if page is 0xFF (fresh erased), and if HW ECC engine within GPMC
258 * is used, the result of read will be 0x0 while the ECC offsets of the
259 * spare area will be 0xFF which will result in an ECC mismatch.
261 static int omap_calculate_ecc(struct mtd_info *mtd, const uint8_t *dat,
264 struct nand_chip *chip = mtd->priv;
265 struct omap_nand_info *info = chip->priv;
266 uint32_t *ptr, val = 0;
269 switch (info->ecc_scheme) {
270 case OMAP_ECC_HAM1_CODE_HW:
271 val = readl(&gpmc_cfg->ecc1_result);
272 ecc_code[0] = val & 0xFF;
273 ecc_code[1] = (val >> 16) & 0xFF;
274 ecc_code[2] = ((val >> 8) & 0x0F) | ((val >> 20) & 0xF0);
277 case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
279 case OMAP_ECC_BCH8_CODE_HW:
280 ptr = &gpmc_cfg->bch_result_0_3[0].bch_result_x[3];
282 ecc_code[i++] = (val >> 0) & 0xFF;
284 for (j = 0; j < 3; j++) {
286 ecc_code[i++] = (val >> 24) & 0xFF;
287 ecc_code[i++] = (val >> 16) & 0xFF;
288 ecc_code[i++] = (val >> 8) & 0xFF;
289 ecc_code[i++] = (val >> 0) & 0xFF;
296 /* ECC scheme specific syndrome customizations */
297 switch (info->ecc_scheme) {
298 case OMAP_ECC_HAM1_CODE_HW:
301 case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
303 for (i = 0; i < chip->ecc.bytes; i++)
304 *(ecc_code + i) = *(ecc_code + i) ^
308 case OMAP_ECC_BCH8_CODE_HW:
309 ecc_code[chip->ecc.bytes - 1] = 0x00;
317 #ifdef CONFIG_NAND_OMAP_ELM
319 * omap_correct_data_bch - Compares the ecc read from nand spare area
320 * with ECC registers values and corrects one bit error if it has occured
322 * @mtd: MTD device structure
324 * @read_ecc: ecc read from nand flash (ignored)
325 * @calc_ecc: ecc read from ECC registers
327 * @return 0 if data is OK or corrected, else returns -1
329 static int omap_correct_data_bch(struct mtd_info *mtd, uint8_t *dat,
330 uint8_t *read_ecc, uint8_t *calc_ecc)
332 struct nand_chip *chip = mtd->priv;
333 struct omap_nand_info *info = chip->priv;
334 struct nand_ecc_ctrl *ecc = &chip->ecc;
335 uint32_t error_count = 0, error_max;
336 uint32_t error_loc[8];
337 enum bch_level bch_type;
338 uint32_t i, ecc_flag = 0;
339 uint8_t count, err = 0;
340 uint32_t byte_pos, bit_pos;
342 /* check calculated ecc */
343 for (i = 0; i < ecc->bytes && !ecc_flag; i++) {
344 if (calc_ecc[i] != 0x00)
350 /* check for whether its a erased-page */
352 for (i = 0; i < ecc->bytes && !ecc_flag; i++) {
353 if (read_ecc[i] != 0xff)
360 * while reading ECC result we read it in big endian.
361 * Hence while loading to ELM we have rotate to get the right endian.
363 switch (info->ecc_scheme) {
364 case OMAP_ECC_BCH8_CODE_HW:
365 bch_type = BCH_8_BIT;
366 omap_reverse_list(calc_ecc, ecc->bytes - 1);
371 /* use elm module to check for errors */
372 elm_config(bch_type);
373 err = elm_check_error(calc_ecc, bch_type, &error_count, error_loc);
377 /* correct bch error */
378 for (count = 0; count < error_count; count++) {
379 switch (info->ecc_scheme) {
380 case OMAP_ECC_BCH8_CODE_HW:
381 /* 14th byte in ECC is reserved to match ROM layout */
382 error_max = SECTOR_BYTES + (ecc->bytes - 1);
387 byte_pos = error_max - (error_loc[count] / 8) - 1;
388 bit_pos = error_loc[count] % 8;
389 if (byte_pos < SECTOR_BYTES) {
390 dat[byte_pos] ^= 1 << bit_pos;
391 printf("nand: bit-flip corrected @data=%d\n", byte_pos);
392 } else if (byte_pos < error_max) {
393 read_ecc[byte_pos - SECTOR_BYTES] ^= 1 << bit_pos;
394 printf("nand: bit-flip corrected @oob=%d\n", byte_pos -
398 printf("nand: error: invalid bit-flip location\n");
401 return (err) ? err : error_count;
405 * omap_read_page_bch - hardware ecc based page read function
406 * @mtd: mtd info structure
407 * @chip: nand chip info structure
408 * @buf: buffer to store read data
409 * @oob_required: caller expects OOB data read to chip->oob_poi
410 * @page: page number to read
413 static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
414 uint8_t *buf, int oob_required, int page)
416 int i, eccsize = chip->ecc.size;
417 int eccbytes = chip->ecc.bytes;
418 int eccsteps = chip->ecc.steps;
420 uint8_t *ecc_calc = chip->buffers->ecccalc;
421 uint8_t *ecc_code = chip->buffers->ecccode;
422 uint32_t *eccpos = chip->ecc.layout->eccpos;
423 uint8_t *oob = chip->oob_poi;
429 oob_pos = (eccsize * eccsteps) + chip->ecc.layout->eccpos[0];
430 oob += chip->ecc.layout->eccpos[0];
432 for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize,
434 chip->ecc.hwctl(mtd, NAND_ECC_READ);
436 chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_pos, page);
437 chip->read_buf(mtd, p, eccsize);
439 /* read respective ecc from oob area */
440 chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, page);
441 chip->read_buf(mtd, oob, eccbytes);
443 chip->ecc.calculate(mtd, p, &ecc_calc[i]);
449 for (i = 0; i < chip->ecc.total; i++)
450 ecc_code[i] = chip->oob_poi[eccpos[i]];
452 eccsteps = chip->ecc.steps;
455 for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
458 stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
460 mtd->ecc_stats.failed++;
462 mtd->ecc_stats.corrected += stat;
466 #endif /* CONFIG_NAND_OMAP_ELM */
469 * OMAP3 BCH8 support (with BCH library)
473 * omap_correct_data_bch_sw - Decode received data and correct errors
474 * @mtd: MTD device structure
476 * @read_ecc: ecc read from nand flash
477 * @calc_ecc: ecc read from HW ECC registers
479 static int omap_correct_data_bch_sw(struct mtd_info *mtd, u_char *data,
480 u_char *read_ecc, u_char *calc_ecc)
483 /* cannot correct more than 8 errors */
484 unsigned int errloc[8];
485 struct nand_chip *chip = mtd->priv;
486 struct omap_nand_info *info = chip->priv;
488 count = decode_bch(info->control, NULL, 512, read_ecc, calc_ecc,
492 for (i = 0; i < count; i++) {
493 /* correct data only, not ecc bytes */
494 if (errloc[i] < 8*512)
495 data[errloc[i]/8] ^= 1 << (errloc[i] & 7);
496 printf("corrected bitflip %u\n", errloc[i]);
500 * BCH8 have 13 bytes of ECC; BCH4 needs adoption
503 for (i = 0; i < 13; i++)
504 printf("%02x ", read_ecc[i]);
507 for (i = 0; i < 13; i++)
508 printf("%02x ", calc_ecc[i]);
512 } else if (count < 0) {
513 puts("ecc unrecoverable error\n");
519 * omap_free_bch - Release BCH ecc resources
520 * @mtd: MTD device structure
522 static void __maybe_unused omap_free_bch(struct mtd_info *mtd)
524 struct nand_chip *chip = mtd->priv;
525 struct omap_nand_info *info = chip->priv;
528 free_bch(info->control);
529 info->control = NULL;
532 #endif /* CONFIG_BCH */
535 * omap_select_ecc_scheme - configures driver for particular ecc-scheme
536 * @nand: NAND chip device structure
537 * @ecc_scheme: ecc scheme to configure
538 * @pagesize: number of main-area bytes per page of NAND device
539 * @oobsize: number of OOB/spare bytes per page of NAND device
541 static int omap_select_ecc_scheme(struct nand_chip *nand,
542 enum omap_ecc ecc_scheme, unsigned int pagesize, unsigned int oobsize) {
543 struct omap_nand_info *info = nand->priv;
544 struct nand_ecclayout *ecclayout = &omap_ecclayout;
545 int eccsteps = pagesize / SECTOR_BYTES;
548 switch (ecc_scheme) {
549 case OMAP_ECC_HAM1_CODE_SW:
550 debug("nand: selected OMAP_ECC_HAM1_CODE_SW\n");
551 /* For this ecc-scheme, ecc.bytes, ecc.layout, ... are
552 * initialized in nand_scan_tail(), so just set ecc.mode */
553 info->control = NULL;
554 nand->ecc.mode = NAND_ECC_SOFT;
555 nand->ecc.layout = NULL;
559 case OMAP_ECC_HAM1_CODE_HW:
560 debug("nand: selected OMAP_ECC_HAM1_CODE_HW\n");
561 /* check ecc-scheme requirements before updating ecc info */
562 if ((3 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) {
563 printf("nand: error: insufficient OOB: require=%d\n", (
564 (3 * eccsteps) + BADBLOCK_MARKER_LENGTH));
567 info->control = NULL;
568 /* populate ecc specific fields */
569 memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl));
570 nand->ecc.mode = NAND_ECC_HW;
571 nand->ecc.strength = 1;
572 nand->ecc.size = SECTOR_BYTES;
574 nand->ecc.hwctl = omap_enable_hwecc;
575 nand->ecc.correct = omap_correct_data;
576 nand->ecc.calculate = omap_calculate_ecc;
577 /* define ecc-layout */
578 ecclayout->eccbytes = nand->ecc.bytes * eccsteps;
579 for (i = 0; i < ecclayout->eccbytes; i++) {
580 if (nand->options & NAND_BUSWIDTH_16)
581 ecclayout->eccpos[i] = i + 2;
583 ecclayout->eccpos[i] = i + 1;
585 ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH;
586 ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes -
587 BADBLOCK_MARKER_LENGTH;
590 case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
592 debug("nand: selected OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n");
593 /* check ecc-scheme requirements before updating ecc info */
594 if ((13 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) {
595 printf("nand: error: insufficient OOB: require=%d\n", (
596 (13 * eccsteps) + BADBLOCK_MARKER_LENGTH));
599 /* check if BCH S/W library can be used for error detection */
600 info->control = init_bch(13, 8, 0x201b);
601 if (!info->control) {
602 printf("nand: error: could not init_bch()\n");
605 /* populate ecc specific fields */
606 memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl));
607 nand->ecc.mode = NAND_ECC_HW;
608 nand->ecc.strength = 8;
609 nand->ecc.size = SECTOR_BYTES;
610 nand->ecc.bytes = 13;
611 nand->ecc.hwctl = omap_enable_hwecc;
612 nand->ecc.correct = omap_correct_data_bch_sw;
613 nand->ecc.calculate = omap_calculate_ecc;
614 /* define ecc-layout */
615 ecclayout->eccbytes = nand->ecc.bytes * eccsteps;
616 ecclayout->eccpos[0] = BADBLOCK_MARKER_LENGTH;
617 for (i = 1; i < ecclayout->eccbytes; i++) {
618 if (i % nand->ecc.bytes)
619 ecclayout->eccpos[i] =
620 ecclayout->eccpos[i - 1] + 1;
622 ecclayout->eccpos[i] =
623 ecclayout->eccpos[i - 1] + 2;
625 ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH;
626 ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes -
627 BADBLOCK_MARKER_LENGTH;
630 printf("nand: error: CONFIG_BCH required for ECC\n");
634 case OMAP_ECC_BCH8_CODE_HW:
635 #ifdef CONFIG_NAND_OMAP_ELM
636 debug("nand: selected OMAP_ECC_BCH8_CODE_HW\n");
637 /* check ecc-scheme requirements before updating ecc info */
638 if ((14 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) {
639 printf("nand: error: insufficient OOB: require=%d\n", (
640 (14 * eccsteps) + BADBLOCK_MARKER_LENGTH));
643 /* intialize ELM for ECC error detection */
645 info->control = NULL;
646 /* populate ecc specific fields */
647 memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl));
648 nand->ecc.mode = NAND_ECC_HW;
649 nand->ecc.strength = 8;
650 nand->ecc.size = SECTOR_BYTES;
651 nand->ecc.bytes = 14;
652 nand->ecc.hwctl = omap_enable_hwecc;
653 nand->ecc.correct = omap_correct_data_bch;
654 nand->ecc.calculate = omap_calculate_ecc;
655 nand->ecc.read_page = omap_read_page_bch;
656 /* define ecc-layout */
657 ecclayout->eccbytes = nand->ecc.bytes * eccsteps;
658 for (i = 0; i < ecclayout->eccbytes; i++)
659 ecclayout->eccpos[i] = i + BADBLOCK_MARKER_LENGTH;
660 ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH;
661 ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes -
662 BADBLOCK_MARKER_LENGTH;
665 printf("nand: error: CONFIG_NAND_OMAP_ELM required for ECC\n");
670 debug("nand: error: ecc scheme not enabled or supported\n");
674 /* nand_scan_tail() sets ham1 sw ecc; hw ecc layout is set by driver */
675 if (ecc_scheme != OMAP_ECC_HAM1_CODE_SW)
676 nand->ecc.layout = ecclayout;
678 info->ecc_scheme = ecc_scheme;
682 #ifndef CONFIG_SPL_BUILD
684 * omap_nand_switch_ecc - switch the ECC operation between different engines
685 * (h/w and s/w) and different algorithms (hamming and BCHx)
687 * @hardware - true if one of the HW engines should be used
688 * @eccstrength - the number of bits that could be corrected
689 * (1 - hamming, 4 - BCH4, 8 - BCH8, 16 - BCH16)
691 int __maybe_unused omap_nand_switch_ecc(uint32_t hardware, uint32_t eccstrength)
693 struct nand_chip *nand;
694 struct mtd_info *mtd;
697 if (nand_curr_device < 0 ||
698 nand_curr_device >= CONFIG_SYS_MAX_NAND_DEVICE ||
699 !nand_info[nand_curr_device].name) {
700 printf("nand: error: no NAND devices found\n");
704 mtd = &nand_info[nand_curr_device];
706 nand->options |= NAND_OWN_BUFFERS;
707 nand->options &= ~NAND_SUBPAGE_READ;
708 /* Setup the ecc configurations again */
710 if (eccstrength == 1) {
711 err = omap_select_ecc_scheme(nand,
712 OMAP_ECC_HAM1_CODE_HW,
713 mtd->writesize, mtd->oobsize);
714 } else if (eccstrength == 8) {
715 err = omap_select_ecc_scheme(nand,
716 OMAP_ECC_BCH8_CODE_HW,
717 mtd->writesize, mtd->oobsize);
719 printf("nand: error: unsupported ECC scheme\n");
723 err = omap_select_ecc_scheme(nand, OMAP_ECC_HAM1_CODE_SW,
724 mtd->writesize, mtd->oobsize);
727 /* Update NAND handling after ECC mode switch */
729 err = nand_scan_tail(mtd);
732 #endif /* CONFIG_SPL_BUILD */
735 * Board-specific NAND initialization. The following members of the
736 * argument are board-specific:
737 * - IO_ADDR_R: address to read the 8 I/O lines of the flash device
738 * - IO_ADDR_W: address to write the 8 I/O lines of the flash device
739 * - cmd_ctrl: hardwarespecific function for accesing control-lines
740 * - waitfunc: hardwarespecific function for accesing device ready/busy line
741 * - ecc.hwctl: function to enable (reset) hardware ecc generator
742 * - ecc.mode: mode of ecc, see defines
743 * - chip_delay: chip dependent delay for transfering data from array to
745 * - options: various chip options. They can partly be set to inform
746 * nand_scan about special functionality. See the defines for further
749 int board_nand_init(struct nand_chip *nand)
751 int32_t gpmc_config = 0;
755 * xloader/Uboot's gpmc configuration would have configured GPMC for
756 * nand type of memory. The following logic scans and latches on to the
757 * first CS with NAND type memory.
758 * TBD: need to make this logic generic to handle multiple CS NAND
761 while (cs < GPMC_MAX_CS) {
762 /* Check if NAND type is set */
763 if ((readl(&gpmc_cfg->cs[cs].config1) & 0xC00) == 0x800) {
769 if (cs >= GPMC_MAX_CS) {
770 printf("nand: error: Unable to find NAND settings in "
771 "GPMC Configuration - quitting\n");
775 gpmc_config = readl(&gpmc_cfg->config);
776 /* Disable Write protect */
778 writel(gpmc_config, &gpmc_cfg->config);
780 nand->IO_ADDR_R = (void __iomem *)&gpmc_cfg->cs[cs].nand_dat;
781 nand->IO_ADDR_W = (void __iomem *)&gpmc_cfg->cs[cs].nand_cmd;
782 nand->priv = &omap_nand_info;
783 nand->cmd_ctrl = omap_nand_hwcontrol;
784 nand->options |= NAND_NO_PADDING | NAND_CACHEPRG;
785 /* If we are 16 bit dev, our gpmc config tells us that */
786 if ((readl(&gpmc_cfg->cs[cs].config1) & 0x3000) == 0x1000)
787 nand->options |= NAND_BUSWIDTH_16;
789 nand->chip_delay = 100;
790 nand->ecc.layout = &omap_ecclayout;
792 /* select ECC scheme */
793 #if defined(CONFIG_NAND_OMAP_ECCSCHEME)
794 err = omap_select_ecc_scheme(nand, CONFIG_NAND_OMAP_ECCSCHEME,
795 CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE);
797 /* pagesize and oobsize are not required to configure sw ecc-scheme */
798 err = omap_select_ecc_scheme(nand, OMAP_ECC_HAM1_CODE_SW,
804 #ifdef CONFIG_SPL_BUILD
805 if (nand->options & NAND_BUSWIDTH_16)
806 nand->read_buf = nand_read_buf16;
808 nand->read_buf = nand_read_buf;
809 nand->dev_ready = omap_spl_dev_ready;