1 // SPDX-License-Identifier: GPL-2.0+
3 * Freescale i.MX28 NAND flash driver
5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
6 * on behalf of DENX Software Engineering GmbH
8 * Based on code from LTIB:
9 * Freescale GPMI NFC NAND Flash Driver
11 * Copyright (C) 2010 Freescale Semiconductor, Inc.
12 * Copyright (C) 2008 Embedded Alley Solutions, Inc.
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/rawnand.h>
18 #include <linux/sizes.h>
19 #include <linux/types.h>
22 #include <linux/errno.h>
24 #include <asm/arch/clock.h>
25 #include <asm/arch/imx-regs.h>
26 #include <asm/mach-imx/regs-bch.h>
27 #include <asm/mach-imx/regs-gpmi.h>
28 #include <asm/arch/sys_proto.h>
29 #include <asm/mach-imx/dma.h>
32 #define MXS_NAND_DMA_DESCRIPTOR_COUNT 4
34 #if (defined(CONFIG_MX6) || defined(CONFIG_MX7))
35 #define MXS_NAND_CHUNK_DATA_CHUNK_SIZE_SHIFT 2
37 #define MXS_NAND_CHUNK_DATA_CHUNK_SIZE_SHIFT 0
39 #define MXS_NAND_METADATA_SIZE 10
40 #define MXS_NAND_BITS_PER_ECC_LEVEL 13
42 #if !defined(CONFIG_SYS_CACHELINE_SIZE) || CONFIG_SYS_CACHELINE_SIZE < 32
43 #define MXS_NAND_COMMAND_BUFFER_SIZE 32
45 #define MXS_NAND_COMMAND_BUFFER_SIZE CONFIG_SYS_CACHELINE_SIZE
48 #define MXS_NAND_BCH_TIMEOUT 10000
51 * @gf_len: The length of Galois Field. (e.g., 13 or 14)
52 * @ecc_strength: A number that describes the strength of the ECC
54 * @ecc_chunk_size: The size, in bytes, of a single ECC chunk. Note
55 * the first chunk in the page includes both data and
56 * metadata, so it's a bit larger than this value.
57 * @ecc_chunk_count: The number of ECC chunks in the page,
58 * @block_mark_byte_offset: The byte offset in the ECC-based page view at
59 * which the underlying physical block mark appears.
60 * @block_mark_bit_offset: The bit offset into the ECC-based page view at
61 * which the underlying physical block mark appears.
65 unsigned int ecc_strength;
66 unsigned int ecc_chunk_size;
67 unsigned int ecc_chunk_count;
68 unsigned int block_mark_byte_offset;
69 unsigned int block_mark_bit_offset;
72 struct mxs_nand_info {
73 struct nand_chip chip;
74 unsigned int max_ecc_strength_supported;
78 uint32_t cmd_queue_len;
79 uint32_t data_buf_size;
80 struct bch_geometry bch_geometry;
86 uint8_t marking_block_bad;
89 struct mxs_gpmi_regs *gpmi_regs;
90 struct mxs_bch_regs *bch_regs;
92 /* Functions with altered behaviour */
93 int (*hooked_read_oob)(struct mtd_info *mtd,
94 loff_t from, struct mtd_oob_ops *ops);
95 int (*hooked_write_oob)(struct mtd_info *mtd,
96 loff_t to, struct mtd_oob_ops *ops);
97 int (*hooked_block_markbad)(struct mtd_info *mtd,
100 /* DMA descriptors */
101 struct mxs_dma_desc **desc;
105 struct nand_ecclayout fake_ecc_layout;
108 * Cache management functions
110 #ifndef CONFIG_SYS_DCACHE_OFF
111 static void mxs_nand_flush_data_buf(struct mxs_nand_info *info)
113 uint32_t addr = (uint32_t)info->data_buf;
115 flush_dcache_range(addr, addr + info->data_buf_size);
118 static void mxs_nand_inval_data_buf(struct mxs_nand_info *info)
120 uint32_t addr = (uint32_t)info->data_buf;
122 invalidate_dcache_range(addr, addr + info->data_buf_size);
125 static void mxs_nand_flush_cmd_buf(struct mxs_nand_info *info)
127 uint32_t addr = (uint32_t)info->cmd_buf;
129 flush_dcache_range(addr, addr + MXS_NAND_COMMAND_BUFFER_SIZE);
132 static inline void mxs_nand_flush_data_buf(struct mxs_nand_info *info) {}
133 static inline void mxs_nand_inval_data_buf(struct mxs_nand_info *info) {}
134 static inline void mxs_nand_flush_cmd_buf(struct mxs_nand_info *info) {}
137 static struct mxs_dma_desc *mxs_nand_get_dma_desc(struct mxs_nand_info *info)
139 struct mxs_dma_desc *desc;
141 if (info->desc_index >= MXS_NAND_DMA_DESCRIPTOR_COUNT) {
142 printf("MXS NAND: Too many DMA descriptors requested\n");
146 desc = info->desc[info->desc_index];
152 static void mxs_nand_return_dma_descs(struct mxs_nand_info *info)
155 struct mxs_dma_desc *desc;
157 for (i = 0; i < info->desc_index; i++) {
158 desc = info->desc[i];
159 memset(desc, 0, sizeof(struct mxs_dma_desc));
160 desc->address = (dma_addr_t)desc;
163 info->desc_index = 0;
166 static uint32_t mxs_nand_aux_status_offset(void)
168 return (MXS_NAND_METADATA_SIZE + 0x3) & ~0x3;
171 static inline int mxs_nand_calc_mark_offset(struct bch_geometry *geo,
172 uint32_t page_data_size)
174 uint32_t chunk_data_size_in_bits = geo->ecc_chunk_size * 8;
175 uint32_t chunk_ecc_size_in_bits = geo->ecc_strength * geo->gf_len;
176 uint32_t chunk_total_size_in_bits;
177 uint32_t block_mark_chunk_number;
178 uint32_t block_mark_chunk_bit_offset;
179 uint32_t block_mark_bit_offset;
181 chunk_total_size_in_bits =
182 chunk_data_size_in_bits + chunk_ecc_size_in_bits;
184 /* Compute the bit offset of the block mark within the physical page. */
185 block_mark_bit_offset = page_data_size * 8;
187 /* Subtract the metadata bits. */
188 block_mark_bit_offset -= MXS_NAND_METADATA_SIZE * 8;
191 * Compute the chunk number (starting at zero) in which the block mark
194 block_mark_chunk_number =
195 block_mark_bit_offset / chunk_total_size_in_bits;
198 * Compute the bit offset of the block mark within its chunk, and
201 block_mark_chunk_bit_offset = block_mark_bit_offset -
202 (block_mark_chunk_number * chunk_total_size_in_bits);
204 if (block_mark_chunk_bit_offset > chunk_data_size_in_bits)
208 * Now that we know the chunk number in which the block mark appears,
209 * we can subtract all the ECC bits that appear before it.
211 block_mark_bit_offset -=
212 block_mark_chunk_number * chunk_ecc_size_in_bits;
214 geo->block_mark_byte_offset = block_mark_bit_offset >> 3;
215 geo->block_mark_bit_offset = block_mark_bit_offset & 0x7;
220 static inline int mxs_nand_calc_ecc_layout_by_info(struct bch_geometry *geo,
221 struct mtd_info *mtd)
223 struct nand_chip *chip = mtd_to_nand(mtd);
224 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
226 if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
229 switch (chip->ecc_step_ds) {
240 geo->ecc_chunk_size = chip->ecc_step_ds;
241 geo->ecc_strength = round_up(chip->ecc_strength_ds, 2);
243 /* Keep the C >= O */
244 if (geo->ecc_chunk_size < mtd->oobsize)
247 if (geo->ecc_strength > nand_info->max_ecc_strength_supported)
250 geo->ecc_chunk_count = mtd->writesize / geo->ecc_chunk_size;
255 static inline int mxs_nand_calc_ecc_layout(struct bch_geometry *geo,
256 struct mtd_info *mtd)
258 struct nand_chip *chip = mtd_to_nand(mtd);
259 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
261 /* The default for the length of Galois Field. */
264 /* The default for chunk size. */
265 geo->ecc_chunk_size = 512;
267 if (geo->ecc_chunk_size < mtd->oobsize) {
269 geo->ecc_chunk_size *= 2;
272 if (mtd->oobsize > geo->ecc_chunk_size) {
273 printf("Not support the NAND chips whose oob size is larger then %d bytes!\n",
274 geo->ecc_chunk_size);
278 geo->ecc_chunk_count = mtd->writesize / geo->ecc_chunk_size;
281 * Determine the ECC layout with the formula:
282 * ECC bits per chunk = (total page spare data bits) /
283 * (bits per ECC level) / (chunks per page)
285 * total page spare data bits =
286 * (page oob size - meta data size) * (bits per byte)
288 geo->ecc_strength = ((mtd->oobsize - MXS_NAND_METADATA_SIZE) * 8)
289 / (geo->gf_len * geo->ecc_chunk_count);
291 geo->ecc_strength = min(round_down(geo->ecc_strength, 2),
292 nand_info->max_ecc_strength_supported);
298 * Wait for BCH complete IRQ and clear the IRQ
300 static int mxs_nand_wait_for_bch_complete(struct mxs_nand_info *nand_info)
302 int timeout = MXS_NAND_BCH_TIMEOUT;
305 ret = mxs_wait_mask_set(&nand_info->bch_regs->hw_bch_ctrl_reg,
306 BCH_CTRL_COMPLETE_IRQ, timeout);
308 writel(BCH_CTRL_COMPLETE_IRQ, &nand_info->bch_regs->hw_bch_ctrl_clr);
314 * This is the function that we install in the cmd_ctrl function pointer of the
315 * owning struct nand_chip. The only functions in the reference implementation
316 * that use these functions pointers are cmdfunc and select_chip.
318 * In this driver, we implement our own select_chip, so this function will only
319 * be called by the reference implementation's cmdfunc. For this reason, we can
320 * ignore the chip enable bit and concentrate only on sending bytes to the NAND
323 static void mxs_nand_cmd_ctrl(struct mtd_info *mtd, int data, unsigned int ctrl)
325 struct nand_chip *nand = mtd_to_nand(mtd);
326 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
327 struct mxs_dma_desc *d;
328 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
332 * If this condition is true, something is _VERY_ wrong in MTD
335 if (nand_info->cmd_queue_len == MXS_NAND_COMMAND_BUFFER_SIZE) {
336 printf("MXS NAND: Command queue too long\n");
341 * Every operation begins with a command byte and a series of zero or
342 * more address bytes. These are distinguished by either the Address
343 * Latch Enable (ALE) or Command Latch Enable (CLE) signals being
344 * asserted. When MTD is ready to execute the command, it will
345 * deasert both latch enables.
347 * Rather than run a separate DMA operation for every single byte, we
348 * queue them up and run a single DMA operation for the entire series
349 * of command and data bytes.
351 if (ctrl & (NAND_ALE | NAND_CLE)) {
352 if (data != NAND_CMD_NONE)
353 nand_info->cmd_buf[nand_info->cmd_queue_len++] = data;
358 * If control arrives here, MTD has deasserted both the ALE and CLE,
359 * which means it's ready to run an operation. Check if we have any
362 if (nand_info->cmd_queue_len == 0)
365 /* Compile the DMA descriptor -- a descriptor that sends command. */
366 d = mxs_nand_get_dma_desc(nand_info);
368 MXS_DMA_DESC_COMMAND_DMA_READ | MXS_DMA_DESC_IRQ |
369 MXS_DMA_DESC_CHAIN | MXS_DMA_DESC_DEC_SEM |
370 MXS_DMA_DESC_WAIT4END | (3 << MXS_DMA_DESC_PIO_WORDS_OFFSET) |
371 (nand_info->cmd_queue_len << MXS_DMA_DESC_BYTES_OFFSET);
373 d->cmd.address = (dma_addr_t)nand_info->cmd_buf;
375 d->cmd.pio_words[0] =
376 GPMI_CTRL0_COMMAND_MODE_WRITE |
377 GPMI_CTRL0_WORD_LENGTH |
378 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
379 GPMI_CTRL0_ADDRESS_NAND_CLE |
380 GPMI_CTRL0_ADDRESS_INCREMENT |
381 nand_info->cmd_queue_len;
383 mxs_dma_desc_append(channel, d);
386 mxs_nand_flush_cmd_buf(nand_info);
388 /* Execute the DMA chain. */
389 ret = mxs_dma_go(channel);
391 printf("MXS NAND: Error sending command\n");
393 mxs_nand_return_dma_descs(nand_info);
395 /* Reset the command queue. */
396 nand_info->cmd_queue_len = 0;
400 * Test if the NAND flash is ready.
402 static int mxs_nand_device_ready(struct mtd_info *mtd)
404 struct nand_chip *chip = mtd_to_nand(mtd);
405 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
408 tmp = readl(&nand_info->gpmi_regs->hw_gpmi_stat);
409 tmp >>= (GPMI_STAT_READY_BUSY_OFFSET + nand_info->cur_chip);
415 * Select the NAND chip.
417 static void mxs_nand_select_chip(struct mtd_info *mtd, int chip)
419 struct nand_chip *nand = mtd_to_nand(mtd);
420 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
422 nand_info->cur_chip = chip;
426 * Handle block mark swapping.
428 * Note that, when this function is called, it doesn't know whether it's
429 * swapping the block mark, or swapping it *back* -- but it doesn't matter
430 * because the the operation is the same.
432 static void mxs_nand_swap_block_mark(struct bch_geometry *geo,
433 uint8_t *data_buf, uint8_t *oob_buf)
435 uint32_t bit_offset = geo->block_mark_bit_offset;
436 uint32_t buf_offset = geo->block_mark_byte_offset;
442 * Get the byte from the data area that overlays the block mark. Since
443 * the ECC engine applies its own view to the bits in the page, the
444 * physical block mark won't (in general) appear on a byte boundary in
447 src = data_buf[buf_offset] >> bit_offset;
448 src |= data_buf[buf_offset + 1] << (8 - bit_offset);
454 data_buf[buf_offset] &= ~(0xff << bit_offset);
455 data_buf[buf_offset + 1] &= 0xff << bit_offset;
457 data_buf[buf_offset] |= dst << bit_offset;
458 data_buf[buf_offset + 1] |= dst >> (8 - bit_offset);
462 * Read data from NAND.
464 static void mxs_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int length)
466 struct nand_chip *nand = mtd_to_nand(mtd);
467 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
468 struct mxs_dma_desc *d;
469 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
472 if (length > NAND_MAX_PAGESIZE) {
473 printf("MXS NAND: DMA buffer too big\n");
478 printf("MXS NAND: DMA buffer is NULL\n");
482 /* Compile the DMA descriptor - a descriptor that reads data. */
483 d = mxs_nand_get_dma_desc(nand_info);
485 MXS_DMA_DESC_COMMAND_DMA_WRITE | MXS_DMA_DESC_IRQ |
486 MXS_DMA_DESC_DEC_SEM | MXS_DMA_DESC_WAIT4END |
487 (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET) |
488 (length << MXS_DMA_DESC_BYTES_OFFSET);
490 d->cmd.address = (dma_addr_t)nand_info->data_buf;
492 d->cmd.pio_words[0] =
493 GPMI_CTRL0_COMMAND_MODE_READ |
494 GPMI_CTRL0_WORD_LENGTH |
495 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
496 GPMI_CTRL0_ADDRESS_NAND_DATA |
499 mxs_dma_desc_append(channel, d);
502 * A DMA descriptor that waits for the command to end and the chip to
505 * I think we actually should *not* be waiting for the chip to become
506 * ready because, after all, we don't care. I think the original code
507 * did that and no one has re-thought it yet.
509 d = mxs_nand_get_dma_desc(nand_info);
511 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_IRQ |
512 MXS_DMA_DESC_NAND_WAIT_4_READY | MXS_DMA_DESC_DEC_SEM |
513 MXS_DMA_DESC_WAIT4END | (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
517 d->cmd.pio_words[0] =
518 GPMI_CTRL0_COMMAND_MODE_WAIT_FOR_READY |
519 GPMI_CTRL0_WORD_LENGTH |
520 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
521 GPMI_CTRL0_ADDRESS_NAND_DATA;
523 mxs_dma_desc_append(channel, d);
525 /* Invalidate caches */
526 mxs_nand_inval_data_buf(nand_info);
528 /* Execute the DMA chain. */
529 ret = mxs_dma_go(channel);
531 printf("MXS NAND: DMA read error\n");
535 /* Invalidate caches */
536 mxs_nand_inval_data_buf(nand_info);
538 memcpy(buf, nand_info->data_buf, length);
541 mxs_nand_return_dma_descs(nand_info);
545 * Write data to NAND.
547 static void mxs_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
550 struct nand_chip *nand = mtd_to_nand(mtd);
551 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
552 struct mxs_dma_desc *d;
553 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
556 if (length > NAND_MAX_PAGESIZE) {
557 printf("MXS NAND: DMA buffer too big\n");
562 printf("MXS NAND: DMA buffer is NULL\n");
566 memcpy(nand_info->data_buf, buf, length);
568 /* Compile the DMA descriptor - a descriptor that writes data. */
569 d = mxs_nand_get_dma_desc(nand_info);
571 MXS_DMA_DESC_COMMAND_DMA_READ | MXS_DMA_DESC_IRQ |
572 MXS_DMA_DESC_DEC_SEM | MXS_DMA_DESC_WAIT4END |
573 (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET) |
574 (length << MXS_DMA_DESC_BYTES_OFFSET);
576 d->cmd.address = (dma_addr_t)nand_info->data_buf;
578 d->cmd.pio_words[0] =
579 GPMI_CTRL0_COMMAND_MODE_WRITE |
580 GPMI_CTRL0_WORD_LENGTH |
581 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
582 GPMI_CTRL0_ADDRESS_NAND_DATA |
585 mxs_dma_desc_append(channel, d);
588 mxs_nand_flush_data_buf(nand_info);
590 /* Execute the DMA chain. */
591 ret = mxs_dma_go(channel);
593 printf("MXS NAND: DMA write error\n");
595 mxs_nand_return_dma_descs(nand_info);
599 * Read a single byte from NAND.
601 static uint8_t mxs_nand_read_byte(struct mtd_info *mtd)
604 mxs_nand_read_buf(mtd, &buf, 1);
609 * Read a page from NAND.
611 static int mxs_nand_ecc_read_page(struct mtd_info *mtd, struct nand_chip *nand,
612 uint8_t *buf, int oob_required,
615 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
616 struct bch_geometry *geo = &nand_info->bch_geometry;
617 struct mxs_dma_desc *d;
618 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
619 uint32_t corrected = 0, failed = 0;
623 /* Compile the DMA descriptor - wait for ready. */
624 d = mxs_nand_get_dma_desc(nand_info);
626 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN |
627 MXS_DMA_DESC_NAND_WAIT_4_READY | MXS_DMA_DESC_WAIT4END |
628 (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
632 d->cmd.pio_words[0] =
633 GPMI_CTRL0_COMMAND_MODE_WAIT_FOR_READY |
634 GPMI_CTRL0_WORD_LENGTH |
635 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
636 GPMI_CTRL0_ADDRESS_NAND_DATA;
638 mxs_dma_desc_append(channel, d);
640 /* Compile the DMA descriptor - enable the BCH block and read. */
641 d = mxs_nand_get_dma_desc(nand_info);
643 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN |
644 MXS_DMA_DESC_WAIT4END | (6 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
648 d->cmd.pio_words[0] =
649 GPMI_CTRL0_COMMAND_MODE_READ |
650 GPMI_CTRL0_WORD_LENGTH |
651 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
652 GPMI_CTRL0_ADDRESS_NAND_DATA |
653 (mtd->writesize + mtd->oobsize);
654 d->cmd.pio_words[1] = 0;
655 d->cmd.pio_words[2] =
656 GPMI_ECCCTRL_ENABLE_ECC |
657 GPMI_ECCCTRL_ECC_CMD_DECODE |
658 GPMI_ECCCTRL_BUFFER_MASK_BCH_PAGE;
659 d->cmd.pio_words[3] = mtd->writesize + mtd->oobsize;
660 d->cmd.pio_words[4] = (dma_addr_t)nand_info->data_buf;
661 d->cmd.pio_words[5] = (dma_addr_t)nand_info->oob_buf;
663 mxs_dma_desc_append(channel, d);
665 /* Compile the DMA descriptor - disable the BCH block. */
666 d = mxs_nand_get_dma_desc(nand_info);
668 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN |
669 MXS_DMA_DESC_NAND_WAIT_4_READY | MXS_DMA_DESC_WAIT4END |
670 (3 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
674 d->cmd.pio_words[0] =
675 GPMI_CTRL0_COMMAND_MODE_WAIT_FOR_READY |
676 GPMI_CTRL0_WORD_LENGTH |
677 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
678 GPMI_CTRL0_ADDRESS_NAND_DATA |
679 (mtd->writesize + mtd->oobsize);
680 d->cmd.pio_words[1] = 0;
681 d->cmd.pio_words[2] = 0;
683 mxs_dma_desc_append(channel, d);
685 /* Compile the DMA descriptor - deassert the NAND lock and interrupt. */
686 d = mxs_nand_get_dma_desc(nand_info);
688 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_IRQ |
689 MXS_DMA_DESC_DEC_SEM;
693 mxs_dma_desc_append(channel, d);
695 /* Invalidate caches */
696 mxs_nand_inval_data_buf(nand_info);
698 /* Execute the DMA chain. */
699 ret = mxs_dma_go(channel);
701 printf("MXS NAND: DMA read error\n");
705 ret = mxs_nand_wait_for_bch_complete(nand_info);
707 printf("MXS NAND: BCH read timeout\n");
711 /* Invalidate caches */
712 mxs_nand_inval_data_buf(nand_info);
714 /* Read DMA completed, now do the mark swapping. */
715 mxs_nand_swap_block_mark(geo, nand_info->data_buf, nand_info->oob_buf);
717 /* Loop over status bytes, accumulating ECC status. */
718 status = nand_info->oob_buf + mxs_nand_aux_status_offset();
719 for (i = 0; i < geo->ecc_chunk_count; i++) {
720 if (status[i] == 0x00)
723 if (status[i] == 0xff)
726 if (status[i] == 0xfe) {
731 corrected += status[i];
734 /* Propagate ECC status to the owning MTD. */
735 mtd->ecc_stats.failed += failed;
736 mtd->ecc_stats.corrected += corrected;
739 * It's time to deliver the OOB bytes. See mxs_nand_ecc_read_oob() for
740 * details about our policy for delivering the OOB.
742 * We fill the caller's buffer with set bits, and then copy the block
743 * mark to the caller's buffer. Note that, if block mark swapping was
744 * necessary, it has already been done, so we can rely on the first
745 * byte of the auxiliary buffer to contain the block mark.
747 memset(nand->oob_poi, 0xff, mtd->oobsize);
749 nand->oob_poi[0] = nand_info->oob_buf[0];
751 memcpy(buf, nand_info->data_buf, mtd->writesize);
754 mxs_nand_return_dma_descs(nand_info);
760 * Write a page to NAND.
762 static int mxs_nand_ecc_write_page(struct mtd_info *mtd,
763 struct nand_chip *nand, const uint8_t *buf,
764 int oob_required, int page)
766 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
767 struct bch_geometry *geo = &nand_info->bch_geometry;
768 struct mxs_dma_desc *d;
769 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
772 memcpy(nand_info->data_buf, buf, mtd->writesize);
773 memcpy(nand_info->oob_buf, nand->oob_poi, mtd->oobsize);
775 /* Handle block mark swapping. */
776 mxs_nand_swap_block_mark(geo, nand_info->data_buf, nand_info->oob_buf);
778 /* Compile the DMA descriptor - write data. */
779 d = mxs_nand_get_dma_desc(nand_info);
781 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_IRQ |
782 MXS_DMA_DESC_DEC_SEM | MXS_DMA_DESC_WAIT4END |
783 (6 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
787 d->cmd.pio_words[0] =
788 GPMI_CTRL0_COMMAND_MODE_WRITE |
789 GPMI_CTRL0_WORD_LENGTH |
790 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
791 GPMI_CTRL0_ADDRESS_NAND_DATA;
792 d->cmd.pio_words[1] = 0;
793 d->cmd.pio_words[2] =
794 GPMI_ECCCTRL_ENABLE_ECC |
795 GPMI_ECCCTRL_ECC_CMD_ENCODE |
796 GPMI_ECCCTRL_BUFFER_MASK_BCH_PAGE;
797 d->cmd.pio_words[3] = (mtd->writesize + mtd->oobsize);
798 d->cmd.pio_words[4] = (dma_addr_t)nand_info->data_buf;
799 d->cmd.pio_words[5] = (dma_addr_t)nand_info->oob_buf;
801 mxs_dma_desc_append(channel, d);
804 mxs_nand_flush_data_buf(nand_info);
806 /* Execute the DMA chain. */
807 ret = mxs_dma_go(channel);
809 printf("MXS NAND: DMA write error\n");
813 ret = mxs_nand_wait_for_bch_complete(nand_info);
815 printf("MXS NAND: BCH write timeout\n");
820 mxs_nand_return_dma_descs(nand_info);
825 * Read OOB from NAND.
827 * This function is a veneer that replaces the function originally installed by
828 * the NAND Flash MTD code.
830 static int mxs_nand_hook_read_oob(struct mtd_info *mtd, loff_t from,
831 struct mtd_oob_ops *ops)
833 struct nand_chip *chip = mtd_to_nand(mtd);
834 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
837 if (ops->mode == MTD_OPS_RAW)
838 nand_info->raw_oob_mode = 1;
840 nand_info->raw_oob_mode = 0;
842 ret = nand_info->hooked_read_oob(mtd, from, ops);
844 nand_info->raw_oob_mode = 0;
852 * This function is a veneer that replaces the function originally installed by
853 * the NAND Flash MTD code.
855 static int mxs_nand_hook_write_oob(struct mtd_info *mtd, loff_t to,
856 struct mtd_oob_ops *ops)
858 struct nand_chip *chip = mtd_to_nand(mtd);
859 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
862 if (ops->mode == MTD_OPS_RAW)
863 nand_info->raw_oob_mode = 1;
865 nand_info->raw_oob_mode = 0;
867 ret = nand_info->hooked_write_oob(mtd, to, ops);
869 nand_info->raw_oob_mode = 0;
875 * Mark a block bad in NAND.
877 * This function is a veneer that replaces the function originally installed by
878 * the NAND Flash MTD code.
880 static int mxs_nand_hook_block_markbad(struct mtd_info *mtd, loff_t ofs)
882 struct nand_chip *chip = mtd_to_nand(mtd);
883 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
886 nand_info->marking_block_bad = 1;
888 ret = nand_info->hooked_block_markbad(mtd, ofs);
890 nand_info->marking_block_bad = 0;
896 * There are several places in this driver where we have to handle the OOB and
897 * block marks. This is the function where things are the most complicated, so
898 * this is where we try to explain it all. All the other places refer back to
901 * These are the rules, in order of decreasing importance:
903 * 1) Nothing the caller does can be allowed to imperil the block mark, so all
904 * write operations take measures to protect it.
906 * 2) In read operations, the first byte of the OOB we return must reflect the
907 * true state of the block mark, no matter where that block mark appears in
910 * 3) ECC-based read operations return an OOB full of set bits (since we never
911 * allow ECC-based writes to the OOB, it doesn't matter what ECC-based reads
914 * 4) "Raw" read operations return a direct view of the physical bytes in the
915 * page, using the conventional definition of which bytes are data and which
916 * are OOB. This gives the caller a way to see the actual, physical bytes
917 * in the page, without the distortions applied by our ECC engine.
919 * What we do for this specific read operation depends on whether we're doing
920 * "raw" read, or an ECC-based read.
922 * It turns out that knowing whether we want an "ECC-based" or "raw" read is not
923 * easy. When reading a page, for example, the NAND Flash MTD code calls our
924 * ecc.read_page or ecc.read_page_raw function. Thus, the fact that MTD wants an
925 * ECC-based or raw view of the page is implicit in which function it calls
926 * (there is a similar pair of ECC-based/raw functions for writing).
928 * Since MTD assumes the OOB is not covered by ECC, there is no pair of
929 * ECC-based/raw functions for reading or or writing the OOB. The fact that the
930 * caller wants an ECC-based or raw view of the page is not propagated down to
933 * Since our OOB *is* covered by ECC, we need this information. So, we hook the
934 * ecc.read_oob and ecc.write_oob function pointers in the owning
935 * struct mtd_info with our own functions. These hook functions set the
936 * raw_oob_mode field so that, when control finally arrives here, we'll know
939 static int mxs_nand_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *nand,
942 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
945 * First, fill in the OOB buffer. If we're doing a raw read, we need to
946 * get the bytes from the physical page. If we're not doing a raw read,
947 * we need to fill the buffer with set bits.
949 if (nand_info->raw_oob_mode) {
951 * If control arrives here, we're doing a "raw" read. Send the
952 * command to read the conventional OOB and read it.
954 nand->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
955 nand->read_buf(mtd, nand->oob_poi, mtd->oobsize);
958 * If control arrives here, we're not doing a "raw" read. Fill
959 * the OOB buffer with set bits and correct the block mark.
961 memset(nand->oob_poi, 0xff, mtd->oobsize);
963 nand->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
964 mxs_nand_read_buf(mtd, nand->oob_poi, 1);
972 * Write OOB data to NAND.
974 static int mxs_nand_ecc_write_oob(struct mtd_info *mtd, struct nand_chip *nand,
977 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
978 uint8_t block_mark = 0;
981 * There are fundamental incompatibilities between the i.MX GPMI NFC and
982 * the NAND Flash MTD model that make it essentially impossible to write
983 * the out-of-band bytes.
985 * We permit *ONE* exception. If the *intent* of writing the OOB is to
986 * mark a block bad, we can do that.
989 if (!nand_info->marking_block_bad) {
990 printf("NXS NAND: Writing OOB isn't supported\n");
994 /* Write the block mark. */
995 nand->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
996 nand->write_buf(mtd, &block_mark, 1);
997 nand->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
999 /* Check if it worked. */
1000 if (nand->waitfunc(mtd, nand) & NAND_STATUS_FAIL)
1007 * Claims all blocks are good.
1009 * In principle, this function is *only* called when the NAND Flash MTD system
1010 * isn't allowed to keep an in-memory bad block table, so it is forced to ask
1011 * the driver for bad block information.
1013 * In fact, we permit the NAND Flash MTD system to have an in-memory BBT, so
1014 * this function is *only* called when we take it away.
1016 * Thus, this function is only called when we want *all* blocks to look good,
1017 * so it *always* return success.
1019 static int mxs_nand_block_bad(struct mtd_info *mtd, loff_t ofs)
1025 * At this point, the physical NAND Flash chips have been identified and
1026 * counted, so we know the physical geometry. This enables us to make some
1027 * important configuration decisions.
1029 * The return value of this function propagates directly back to this driver's
1030 * board_nand_init(). Anything other than zero will cause this driver to
1031 * tear everything down and declare failure.
1033 int mxs_nand_setup_ecc(struct mtd_info *mtd)
1035 struct nand_chip *nand = mtd_to_nand(mtd);
1036 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
1037 struct bch_geometry *geo = &nand_info->bch_geometry;
1038 struct mxs_bch_regs *bch_regs = nand_info->bch_regs;
1040 int ret = -ENOTSUPP;
1042 if (nand_info->use_minimum_ecc)
1043 ret = mxs_nand_calc_ecc_layout_by_info(geo, mtd);
1045 if (ret == -ENOTSUPP)
1046 ret = mxs_nand_calc_ecc_layout(geo, mtd);
1051 mxs_nand_calc_mark_offset(geo, mtd->writesize);
1053 /* Configure BCH and set NFC geometry */
1054 mxs_reset_block(&bch_regs->hw_bch_ctrl_reg);
1056 /* Configure layout 0 */
1057 tmp = (geo->ecc_chunk_count - 1) << BCH_FLASHLAYOUT0_NBLOCKS_OFFSET;
1058 tmp |= MXS_NAND_METADATA_SIZE << BCH_FLASHLAYOUT0_META_SIZE_OFFSET;
1059 tmp |= (geo->ecc_strength >> 1) << BCH_FLASHLAYOUT0_ECC0_OFFSET;
1060 tmp |= geo->ecc_chunk_size >> MXS_NAND_CHUNK_DATA_CHUNK_SIZE_SHIFT;
1061 tmp |= (geo->gf_len == 14 ? 1 : 0) <<
1062 BCH_FLASHLAYOUT0_GF13_0_GF14_1_OFFSET;
1063 writel(tmp, &bch_regs->hw_bch_flash0layout0);
1065 tmp = (mtd->writesize + mtd->oobsize)
1066 << BCH_FLASHLAYOUT1_PAGE_SIZE_OFFSET;
1067 tmp |= (geo->ecc_strength >> 1) << BCH_FLASHLAYOUT1_ECCN_OFFSET;
1068 tmp |= geo->ecc_chunk_size >> MXS_NAND_CHUNK_DATA_CHUNK_SIZE_SHIFT;
1069 tmp |= (geo->gf_len == 14 ? 1 : 0) <<
1070 BCH_FLASHLAYOUT1_GF13_0_GF14_1_OFFSET;
1071 writel(tmp, &bch_regs->hw_bch_flash0layout1);
1073 /* Set *all* chip selects to use layout 0 */
1074 writel(0, &bch_regs->hw_bch_layoutselect);
1076 /* Enable BCH complete interrupt */
1077 writel(BCH_CTRL_COMPLETE_IRQ_EN, &bch_regs->hw_bch_ctrl_set);
1079 /* Hook some operations at the MTD level. */
1080 if (mtd->_read_oob != mxs_nand_hook_read_oob) {
1081 nand_info->hooked_read_oob = mtd->_read_oob;
1082 mtd->_read_oob = mxs_nand_hook_read_oob;
1085 if (mtd->_write_oob != mxs_nand_hook_write_oob) {
1086 nand_info->hooked_write_oob = mtd->_write_oob;
1087 mtd->_write_oob = mxs_nand_hook_write_oob;
1090 if (mtd->_block_markbad != mxs_nand_hook_block_markbad) {
1091 nand_info->hooked_block_markbad = mtd->_block_markbad;
1092 mtd->_block_markbad = mxs_nand_hook_block_markbad;
1099 * Allocate DMA buffers
1101 int mxs_nand_alloc_buffers(struct mxs_nand_info *nand_info)
1104 const int size = NAND_MAX_PAGESIZE + NAND_MAX_OOBSIZE;
1106 nand_info->data_buf_size = roundup(size, MXS_DMA_ALIGNMENT);
1109 buf = memalign(MXS_DMA_ALIGNMENT, nand_info->data_buf_size);
1111 printf("MXS NAND: Error allocating DMA buffers\n");
1115 memset(buf, 0, nand_info->data_buf_size);
1117 nand_info->data_buf = buf;
1118 nand_info->oob_buf = buf + NAND_MAX_PAGESIZE;
1119 /* Command buffers */
1120 nand_info->cmd_buf = memalign(MXS_DMA_ALIGNMENT,
1121 MXS_NAND_COMMAND_BUFFER_SIZE);
1122 if (!nand_info->cmd_buf) {
1124 printf("MXS NAND: Error allocating command buffers\n");
1127 memset(nand_info->cmd_buf, 0, MXS_NAND_COMMAND_BUFFER_SIZE);
1128 nand_info->cmd_queue_len = 0;
1134 * Initializes the NFC hardware.
1136 int mxs_nand_init_dma(struct mxs_nand_info *info)
1138 int i = 0, j, ret = 0;
1140 info->desc = malloc(sizeof(struct mxs_dma_desc *) *
1141 MXS_NAND_DMA_DESCRIPTOR_COUNT);
1147 /* Allocate the DMA descriptors. */
1148 for (i = 0; i < MXS_NAND_DMA_DESCRIPTOR_COUNT; i++) {
1149 info->desc[i] = mxs_dma_desc_alloc();
1150 if (!info->desc[i]) {
1156 /* Init the DMA controller. */
1158 for (j = MXS_DMA_CHANNEL_AHB_APBH_GPMI0;
1159 j <= MXS_DMA_CHANNEL_AHB_APBH_GPMI7; j++) {
1160 ret = mxs_dma_init_channel(j);
1165 /* Reset the GPMI block. */
1166 mxs_reset_block(&info->gpmi_regs->hw_gpmi_ctrl0_reg);
1167 mxs_reset_block(&info->bch_regs->hw_bch_ctrl_reg);
1170 * Choose NAND mode, set IRQ polarity, disable write protection and
1173 clrsetbits_le32(&info->gpmi_regs->hw_gpmi_ctrl1,
1174 GPMI_CTRL1_GPMI_MODE,
1175 GPMI_CTRL1_ATA_IRQRDY_POLARITY | GPMI_CTRL1_DEV_RESET |
1176 GPMI_CTRL1_BCH_MODE);
1181 for (--j; j >= MXS_DMA_CHANNEL_AHB_APBH_GPMI0; j--)
1184 for (--i; i >= 0; i--)
1185 mxs_dma_desc_free(info->desc[i]);
1189 printf("MXS NAND: Unable to allocate DMA descriptors\n");
1193 int mxs_nand_init_spl(struct nand_chip *nand)
1195 struct mxs_nand_info *nand_info;
1198 nand_info = malloc(sizeof(struct mxs_nand_info));
1200 printf("MXS NAND: Failed to allocate private data\n");
1203 memset(nand_info, 0, sizeof(struct mxs_nand_info));
1205 nand_info->gpmi_regs = (struct mxs_gpmi_regs *)MXS_GPMI_BASE;
1206 nand_info->bch_regs = (struct mxs_bch_regs *)MXS_BCH_BASE;
1207 err = mxs_nand_alloc_buffers(nand_info);
1211 err = mxs_nand_init_dma(nand_info);
1215 nand_set_controller_data(nand, nand_info);
1217 nand->options |= NAND_NO_SUBPAGE_WRITE;
1219 nand->cmd_ctrl = mxs_nand_cmd_ctrl;
1220 nand->dev_ready = mxs_nand_device_ready;
1221 nand->select_chip = mxs_nand_select_chip;
1223 nand->read_byte = mxs_nand_read_byte;
1224 nand->read_buf = mxs_nand_read_buf;
1226 nand->ecc.read_page = mxs_nand_ecc_read_page;
1228 nand->ecc.mode = NAND_ECC_HW;
1229 nand->ecc.bytes = 9;
1230 nand->ecc.size = 512;
1231 nand->ecc.strength = 8;
1236 int mxs_nand_init(struct mxs_nand_info *nand_info)
1238 struct mtd_info *mtd;
1239 struct nand_chip *nand;
1242 nand = &nand_info->chip;
1243 mtd = nand_to_mtd(nand);
1244 err = mxs_nand_alloc_buffers(nand_info);
1248 err = mxs_nand_init_dma(nand_info);
1250 goto err_free_buffers;
1252 memset(&fake_ecc_layout, 0, sizeof(fake_ecc_layout));
1254 #ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
1255 nand->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
1258 nand_set_controller_data(nand, nand_info);
1259 nand->options |= NAND_NO_SUBPAGE_WRITE;
1261 nand->cmd_ctrl = mxs_nand_cmd_ctrl;
1263 nand->dev_ready = mxs_nand_device_ready;
1264 nand->select_chip = mxs_nand_select_chip;
1265 nand->block_bad = mxs_nand_block_bad;
1267 nand->read_byte = mxs_nand_read_byte;
1269 nand->read_buf = mxs_nand_read_buf;
1270 nand->write_buf = mxs_nand_write_buf;
1272 /* first scan to find the device and get the page size */
1273 if (nand_scan_ident(mtd, CONFIG_SYS_MAX_NAND_DEVICE, NULL))
1274 goto err_free_buffers;
1276 if (mxs_nand_setup_ecc(mtd))
1277 goto err_free_buffers;
1279 nand->ecc.read_page = mxs_nand_ecc_read_page;
1280 nand->ecc.write_page = mxs_nand_ecc_write_page;
1281 nand->ecc.read_oob = mxs_nand_ecc_read_oob;
1282 nand->ecc.write_oob = mxs_nand_ecc_write_oob;
1284 nand->ecc.layout = &fake_ecc_layout;
1285 nand->ecc.mode = NAND_ECC_HW;
1286 nand->ecc.size = nand_info->bch_geometry.ecc_chunk_size;
1287 nand->ecc.strength = nand_info->bch_geometry.ecc_strength;
1289 /* second phase scan */
1290 err = nand_scan_tail(mtd);
1292 goto err_free_buffers;
1294 err = nand_register(0, mtd);
1296 goto err_free_buffers;
1301 free(nand_info->data_buf);
1302 free(nand_info->cmd_buf);
1307 void board_nand_init(void)
1309 struct mxs_nand_info *nand_info;
1311 nand_info = malloc(sizeof(struct mxs_nand_info));
1313 printf("MXS NAND: Failed to allocate private data\n");
1316 memset(nand_info, 0, sizeof(struct mxs_nand_info));
1318 nand_info->gpmi_regs = (struct mxs_gpmi_regs *)MXS_GPMI_BASE;
1319 nand_info->bch_regs = (struct mxs_bch_regs *)MXS_BCH_BASE;
1321 /* Refer to Chapter 17 for i.MX6DQ, Chapter 18 for i.MX6SX */
1322 if (is_mx6sx() || is_mx7())
1323 nand_info->max_ecc_strength_supported = 62;
1325 nand_info->max_ecc_strength_supported = 40;
1327 #ifdef CONFIG_NAND_MXS_USE_MINIMUM_ECC
1328 nand_info->use_minimum_ecc = true;
1331 if (mxs_nand_init(nand_info) < 0)