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.
17 #include <linux/mtd/rawnand.h>
18 #include <linux/sizes.h>
19 #include <linux/types.h>
21 #include <linux/errno.h>
23 #include <asm/arch/clock.h>
24 #include <asm/arch/imx-regs.h>
25 #include <asm/mach-imx/regs-bch.h>
26 #include <asm/mach-imx/regs-gpmi.h>
27 #include <asm/arch/sys_proto.h>
30 #define MXS_NAND_DMA_DESCRIPTOR_COUNT 4
32 #if (defined(CONFIG_MX6) || defined(CONFIG_MX7))
33 #define MXS_NAND_CHUNK_DATA_CHUNK_SIZE_SHIFT 2
35 #define MXS_NAND_CHUNK_DATA_CHUNK_SIZE_SHIFT 0
37 #define MXS_NAND_METADATA_SIZE 10
38 #define MXS_NAND_BITS_PER_ECC_LEVEL 13
40 #if !defined(CONFIG_SYS_CACHELINE_SIZE) || CONFIG_SYS_CACHELINE_SIZE < 32
41 #define MXS_NAND_COMMAND_BUFFER_SIZE 32
43 #define MXS_NAND_COMMAND_BUFFER_SIZE CONFIG_SYS_CACHELINE_SIZE
46 #define MXS_NAND_BCH_TIMEOUT 10000
48 struct nand_ecclayout fake_ecc_layout;
51 * Cache management functions
53 #ifndef CONFIG_SYS_DCACHE_OFF
54 static void mxs_nand_flush_data_buf(struct mxs_nand_info *info)
56 uint32_t addr = (uint32_t)info->data_buf;
58 flush_dcache_range(addr, addr + info->data_buf_size);
61 static void mxs_nand_inval_data_buf(struct mxs_nand_info *info)
63 uint32_t addr = (uint32_t)info->data_buf;
65 invalidate_dcache_range(addr, addr + info->data_buf_size);
68 static void mxs_nand_flush_cmd_buf(struct mxs_nand_info *info)
70 uint32_t addr = (uint32_t)info->cmd_buf;
72 flush_dcache_range(addr, addr + MXS_NAND_COMMAND_BUFFER_SIZE);
75 static inline void mxs_nand_flush_data_buf(struct mxs_nand_info *info) {}
76 static inline void mxs_nand_inval_data_buf(struct mxs_nand_info *info) {}
77 static inline void mxs_nand_flush_cmd_buf(struct mxs_nand_info *info) {}
80 static struct mxs_dma_desc *mxs_nand_get_dma_desc(struct mxs_nand_info *info)
82 struct mxs_dma_desc *desc;
84 if (info->desc_index >= MXS_NAND_DMA_DESCRIPTOR_COUNT) {
85 printf("MXS NAND: Too many DMA descriptors requested\n");
89 desc = info->desc[info->desc_index];
95 static void mxs_nand_return_dma_descs(struct mxs_nand_info *info)
98 struct mxs_dma_desc *desc;
100 for (i = 0; i < info->desc_index; i++) {
101 desc = info->desc[i];
102 memset(desc, 0, sizeof(struct mxs_dma_desc));
103 desc->address = (dma_addr_t)desc;
106 info->desc_index = 0;
109 static uint32_t mxs_nand_aux_status_offset(void)
111 return (MXS_NAND_METADATA_SIZE + 0x3) & ~0x3;
114 static inline int mxs_nand_calc_mark_offset(struct bch_geometry *geo,
115 uint32_t page_data_size)
117 uint32_t chunk_data_size_in_bits = geo->ecc_chunk_size * 8;
118 uint32_t chunk_ecc_size_in_bits = geo->ecc_strength * geo->gf_len;
119 uint32_t chunk_total_size_in_bits;
120 uint32_t block_mark_chunk_number;
121 uint32_t block_mark_chunk_bit_offset;
122 uint32_t block_mark_bit_offset;
124 chunk_total_size_in_bits =
125 chunk_data_size_in_bits + chunk_ecc_size_in_bits;
127 /* Compute the bit offset of the block mark within the physical page. */
128 block_mark_bit_offset = page_data_size * 8;
130 /* Subtract the metadata bits. */
131 block_mark_bit_offset -= MXS_NAND_METADATA_SIZE * 8;
134 * Compute the chunk number (starting at zero) in which the block mark
137 block_mark_chunk_number =
138 block_mark_bit_offset / chunk_total_size_in_bits;
141 * Compute the bit offset of the block mark within its chunk, and
144 block_mark_chunk_bit_offset = block_mark_bit_offset -
145 (block_mark_chunk_number * chunk_total_size_in_bits);
147 if (block_mark_chunk_bit_offset > chunk_data_size_in_bits)
151 * Now that we know the chunk number in which the block mark appears,
152 * we can subtract all the ECC bits that appear before it.
154 block_mark_bit_offset -=
155 block_mark_chunk_number * chunk_ecc_size_in_bits;
157 geo->block_mark_byte_offset = block_mark_bit_offset >> 3;
158 geo->block_mark_bit_offset = block_mark_bit_offset & 0x7;
163 static inline int mxs_nand_calc_ecc_layout_by_info(struct bch_geometry *geo,
164 struct mtd_info *mtd)
166 struct nand_chip *chip = mtd_to_nand(mtd);
167 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
169 if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
172 switch (chip->ecc_step_ds) {
183 geo->ecc_chunk_size = chip->ecc_step_ds;
184 geo->ecc_strength = round_up(chip->ecc_strength_ds, 2);
186 /* Keep the C >= O */
187 if (geo->ecc_chunk_size < mtd->oobsize)
190 if (geo->ecc_strength > nand_info->max_ecc_strength_supported)
193 geo->ecc_chunk_count = mtd->writesize / geo->ecc_chunk_size;
198 static inline int mxs_nand_calc_ecc_layout(struct bch_geometry *geo,
199 struct mtd_info *mtd)
201 struct nand_chip *chip = mtd_to_nand(mtd);
202 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
204 /* The default for the length of Galois Field. */
207 /* The default for chunk size. */
208 geo->ecc_chunk_size = 512;
210 if (geo->ecc_chunk_size < mtd->oobsize) {
212 geo->ecc_chunk_size *= 2;
215 if (mtd->oobsize > geo->ecc_chunk_size) {
216 printf("Not support the NAND chips whose oob size is larger then %d bytes!\n",
217 geo->ecc_chunk_size);
221 geo->ecc_chunk_count = mtd->writesize / geo->ecc_chunk_size;
224 * Determine the ECC layout with the formula:
225 * ECC bits per chunk = (total page spare data bits) /
226 * (bits per ECC level) / (chunks per page)
228 * total page spare data bits =
229 * (page oob size - meta data size) * (bits per byte)
231 geo->ecc_strength = ((mtd->oobsize - MXS_NAND_METADATA_SIZE) * 8)
232 / (geo->gf_len * geo->ecc_chunk_count);
234 geo->ecc_strength = min(round_down(geo->ecc_strength, 2),
235 nand_info->max_ecc_strength_supported);
241 * Wait for BCH complete IRQ and clear the IRQ
243 static int mxs_nand_wait_for_bch_complete(struct mxs_nand_info *nand_info)
245 int timeout = MXS_NAND_BCH_TIMEOUT;
248 ret = mxs_wait_mask_set(&nand_info->bch_regs->hw_bch_ctrl_reg,
249 BCH_CTRL_COMPLETE_IRQ, timeout);
251 writel(BCH_CTRL_COMPLETE_IRQ, &nand_info->bch_regs->hw_bch_ctrl_clr);
257 * This is the function that we install in the cmd_ctrl function pointer of the
258 * owning struct nand_chip. The only functions in the reference implementation
259 * that use these functions pointers are cmdfunc and select_chip.
261 * In this driver, we implement our own select_chip, so this function will only
262 * be called by the reference implementation's cmdfunc. For this reason, we can
263 * ignore the chip enable bit and concentrate only on sending bytes to the NAND
266 static void mxs_nand_cmd_ctrl(struct mtd_info *mtd, int data, unsigned int ctrl)
268 struct nand_chip *nand = mtd_to_nand(mtd);
269 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
270 struct mxs_dma_desc *d;
271 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
275 * If this condition is true, something is _VERY_ wrong in MTD
278 if (nand_info->cmd_queue_len == MXS_NAND_COMMAND_BUFFER_SIZE) {
279 printf("MXS NAND: Command queue too long\n");
284 * Every operation begins with a command byte and a series of zero or
285 * more address bytes. These are distinguished by either the Address
286 * Latch Enable (ALE) or Command Latch Enable (CLE) signals being
287 * asserted. When MTD is ready to execute the command, it will
288 * deasert both latch enables.
290 * Rather than run a separate DMA operation for every single byte, we
291 * queue them up and run a single DMA operation for the entire series
292 * of command and data bytes.
294 if (ctrl & (NAND_ALE | NAND_CLE)) {
295 if (data != NAND_CMD_NONE)
296 nand_info->cmd_buf[nand_info->cmd_queue_len++] = data;
301 * If control arrives here, MTD has deasserted both the ALE and CLE,
302 * which means it's ready to run an operation. Check if we have any
305 if (nand_info->cmd_queue_len == 0)
308 /* Compile the DMA descriptor -- a descriptor that sends command. */
309 d = mxs_nand_get_dma_desc(nand_info);
311 MXS_DMA_DESC_COMMAND_DMA_READ | MXS_DMA_DESC_IRQ |
312 MXS_DMA_DESC_CHAIN | MXS_DMA_DESC_DEC_SEM |
313 MXS_DMA_DESC_WAIT4END | (3 << MXS_DMA_DESC_PIO_WORDS_OFFSET) |
314 (nand_info->cmd_queue_len << MXS_DMA_DESC_BYTES_OFFSET);
316 d->cmd.address = (dma_addr_t)nand_info->cmd_buf;
318 d->cmd.pio_words[0] =
319 GPMI_CTRL0_COMMAND_MODE_WRITE |
320 GPMI_CTRL0_WORD_LENGTH |
321 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
322 GPMI_CTRL0_ADDRESS_NAND_CLE |
323 GPMI_CTRL0_ADDRESS_INCREMENT |
324 nand_info->cmd_queue_len;
326 mxs_dma_desc_append(channel, d);
329 mxs_nand_flush_cmd_buf(nand_info);
331 /* Execute the DMA chain. */
332 ret = mxs_dma_go(channel);
334 printf("MXS NAND: Error sending command\n");
336 mxs_nand_return_dma_descs(nand_info);
338 /* Reset the command queue. */
339 nand_info->cmd_queue_len = 0;
343 * Test if the NAND flash is ready.
345 static int mxs_nand_device_ready(struct mtd_info *mtd)
347 struct nand_chip *chip = mtd_to_nand(mtd);
348 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
351 tmp = readl(&nand_info->gpmi_regs->hw_gpmi_stat);
352 tmp >>= (GPMI_STAT_READY_BUSY_OFFSET + nand_info->cur_chip);
358 * Select the NAND chip.
360 static void mxs_nand_select_chip(struct mtd_info *mtd, int chip)
362 struct nand_chip *nand = mtd_to_nand(mtd);
363 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
365 nand_info->cur_chip = chip;
369 * Handle block mark swapping.
371 * Note that, when this function is called, it doesn't know whether it's
372 * swapping the block mark, or swapping it *back* -- but it doesn't matter
373 * because the the operation is the same.
375 static void mxs_nand_swap_block_mark(struct bch_geometry *geo,
376 uint8_t *data_buf, uint8_t *oob_buf)
378 uint32_t bit_offset = geo->block_mark_bit_offset;
379 uint32_t buf_offset = geo->block_mark_byte_offset;
385 * Get the byte from the data area that overlays the block mark. Since
386 * the ECC engine applies its own view to the bits in the page, the
387 * physical block mark won't (in general) appear on a byte boundary in
390 src = data_buf[buf_offset] >> bit_offset;
391 src |= data_buf[buf_offset + 1] << (8 - bit_offset);
397 data_buf[buf_offset] &= ~(0xff << bit_offset);
398 data_buf[buf_offset + 1] &= 0xff << bit_offset;
400 data_buf[buf_offset] |= dst << bit_offset;
401 data_buf[buf_offset + 1] |= dst >> (8 - bit_offset);
405 * Read data from NAND.
407 static void mxs_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int length)
409 struct nand_chip *nand = mtd_to_nand(mtd);
410 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
411 struct mxs_dma_desc *d;
412 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
415 if (length > NAND_MAX_PAGESIZE) {
416 printf("MXS NAND: DMA buffer too big\n");
421 printf("MXS NAND: DMA buffer is NULL\n");
425 /* Compile the DMA descriptor - a descriptor that reads data. */
426 d = mxs_nand_get_dma_desc(nand_info);
428 MXS_DMA_DESC_COMMAND_DMA_WRITE | MXS_DMA_DESC_IRQ |
429 MXS_DMA_DESC_DEC_SEM | MXS_DMA_DESC_WAIT4END |
430 (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET) |
431 (length << MXS_DMA_DESC_BYTES_OFFSET);
433 d->cmd.address = (dma_addr_t)nand_info->data_buf;
435 d->cmd.pio_words[0] =
436 GPMI_CTRL0_COMMAND_MODE_READ |
437 GPMI_CTRL0_WORD_LENGTH |
438 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
439 GPMI_CTRL0_ADDRESS_NAND_DATA |
442 mxs_dma_desc_append(channel, d);
445 * A DMA descriptor that waits for the command to end and the chip to
448 * I think we actually should *not* be waiting for the chip to become
449 * ready because, after all, we don't care. I think the original code
450 * did that and no one has re-thought it yet.
452 d = mxs_nand_get_dma_desc(nand_info);
454 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_IRQ |
455 MXS_DMA_DESC_NAND_WAIT_4_READY | MXS_DMA_DESC_DEC_SEM |
456 MXS_DMA_DESC_WAIT4END | (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
460 d->cmd.pio_words[0] =
461 GPMI_CTRL0_COMMAND_MODE_WAIT_FOR_READY |
462 GPMI_CTRL0_WORD_LENGTH |
463 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
464 GPMI_CTRL0_ADDRESS_NAND_DATA;
466 mxs_dma_desc_append(channel, d);
468 /* Invalidate caches */
469 mxs_nand_inval_data_buf(nand_info);
471 /* Execute the DMA chain. */
472 ret = mxs_dma_go(channel);
474 printf("MXS NAND: DMA read error\n");
478 /* Invalidate caches */
479 mxs_nand_inval_data_buf(nand_info);
481 memcpy(buf, nand_info->data_buf, length);
484 mxs_nand_return_dma_descs(nand_info);
488 * Write data to NAND.
490 static void mxs_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
493 struct nand_chip *nand = mtd_to_nand(mtd);
494 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
495 struct mxs_dma_desc *d;
496 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
499 if (length > NAND_MAX_PAGESIZE) {
500 printf("MXS NAND: DMA buffer too big\n");
505 printf("MXS NAND: DMA buffer is NULL\n");
509 memcpy(nand_info->data_buf, buf, length);
511 /* Compile the DMA descriptor - a descriptor that writes data. */
512 d = mxs_nand_get_dma_desc(nand_info);
514 MXS_DMA_DESC_COMMAND_DMA_READ | MXS_DMA_DESC_IRQ |
515 MXS_DMA_DESC_DEC_SEM | MXS_DMA_DESC_WAIT4END |
516 (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET) |
517 (length << MXS_DMA_DESC_BYTES_OFFSET);
519 d->cmd.address = (dma_addr_t)nand_info->data_buf;
521 d->cmd.pio_words[0] =
522 GPMI_CTRL0_COMMAND_MODE_WRITE |
523 GPMI_CTRL0_WORD_LENGTH |
524 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
525 GPMI_CTRL0_ADDRESS_NAND_DATA |
528 mxs_dma_desc_append(channel, d);
531 mxs_nand_flush_data_buf(nand_info);
533 /* Execute the DMA chain. */
534 ret = mxs_dma_go(channel);
536 printf("MXS NAND: DMA write error\n");
538 mxs_nand_return_dma_descs(nand_info);
542 * Read a single byte from NAND.
544 static uint8_t mxs_nand_read_byte(struct mtd_info *mtd)
547 mxs_nand_read_buf(mtd, &buf, 1);
552 * Read a page from NAND.
554 static int mxs_nand_ecc_read_page(struct mtd_info *mtd, struct nand_chip *nand,
555 uint8_t *buf, int oob_required,
558 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
559 struct bch_geometry *geo = &nand_info->bch_geometry;
560 struct mxs_dma_desc *d;
561 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
562 uint32_t corrected = 0, failed = 0;
566 /* Compile the DMA descriptor - wait for ready. */
567 d = mxs_nand_get_dma_desc(nand_info);
569 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN |
570 MXS_DMA_DESC_NAND_WAIT_4_READY | MXS_DMA_DESC_WAIT4END |
571 (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
575 d->cmd.pio_words[0] =
576 GPMI_CTRL0_COMMAND_MODE_WAIT_FOR_READY |
577 GPMI_CTRL0_WORD_LENGTH |
578 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
579 GPMI_CTRL0_ADDRESS_NAND_DATA;
581 mxs_dma_desc_append(channel, d);
583 /* Compile the DMA descriptor - enable the BCH block and read. */
584 d = mxs_nand_get_dma_desc(nand_info);
586 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN |
587 MXS_DMA_DESC_WAIT4END | (6 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
591 d->cmd.pio_words[0] =
592 GPMI_CTRL0_COMMAND_MODE_READ |
593 GPMI_CTRL0_WORD_LENGTH |
594 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
595 GPMI_CTRL0_ADDRESS_NAND_DATA |
596 (mtd->writesize + mtd->oobsize);
597 d->cmd.pio_words[1] = 0;
598 d->cmd.pio_words[2] =
599 GPMI_ECCCTRL_ENABLE_ECC |
600 GPMI_ECCCTRL_ECC_CMD_DECODE |
601 GPMI_ECCCTRL_BUFFER_MASK_BCH_PAGE;
602 d->cmd.pio_words[3] = mtd->writesize + mtd->oobsize;
603 d->cmd.pio_words[4] = (dma_addr_t)nand_info->data_buf;
604 d->cmd.pio_words[5] = (dma_addr_t)nand_info->oob_buf;
606 mxs_dma_desc_append(channel, d);
608 /* Compile the DMA descriptor - disable the BCH block. */
609 d = mxs_nand_get_dma_desc(nand_info);
611 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN |
612 MXS_DMA_DESC_NAND_WAIT_4_READY | MXS_DMA_DESC_WAIT4END |
613 (3 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
617 d->cmd.pio_words[0] =
618 GPMI_CTRL0_COMMAND_MODE_WAIT_FOR_READY |
619 GPMI_CTRL0_WORD_LENGTH |
620 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
621 GPMI_CTRL0_ADDRESS_NAND_DATA |
622 (mtd->writesize + mtd->oobsize);
623 d->cmd.pio_words[1] = 0;
624 d->cmd.pio_words[2] = 0;
626 mxs_dma_desc_append(channel, d);
628 /* Compile the DMA descriptor - deassert the NAND lock and interrupt. */
629 d = mxs_nand_get_dma_desc(nand_info);
631 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_IRQ |
632 MXS_DMA_DESC_DEC_SEM;
636 mxs_dma_desc_append(channel, d);
638 /* Invalidate caches */
639 mxs_nand_inval_data_buf(nand_info);
641 /* Execute the DMA chain. */
642 ret = mxs_dma_go(channel);
644 printf("MXS NAND: DMA read error\n");
648 ret = mxs_nand_wait_for_bch_complete(nand_info);
650 printf("MXS NAND: BCH read timeout\n");
654 /* Invalidate caches */
655 mxs_nand_inval_data_buf(nand_info);
657 /* Read DMA completed, now do the mark swapping. */
658 mxs_nand_swap_block_mark(geo, nand_info->data_buf, nand_info->oob_buf);
660 /* Loop over status bytes, accumulating ECC status. */
661 status = nand_info->oob_buf + mxs_nand_aux_status_offset();
662 for (i = 0; i < geo->ecc_chunk_count; i++) {
663 if (status[i] == 0x00)
666 if (status[i] == 0xff)
669 if (status[i] == 0xfe) {
674 corrected += status[i];
677 /* Propagate ECC status to the owning MTD. */
678 mtd->ecc_stats.failed += failed;
679 mtd->ecc_stats.corrected += corrected;
682 * It's time to deliver the OOB bytes. See mxs_nand_ecc_read_oob() for
683 * details about our policy for delivering the OOB.
685 * We fill the caller's buffer with set bits, and then copy the block
686 * mark to the caller's buffer. Note that, if block mark swapping was
687 * necessary, it has already been done, so we can rely on the first
688 * byte of the auxiliary buffer to contain the block mark.
690 memset(nand->oob_poi, 0xff, mtd->oobsize);
692 nand->oob_poi[0] = nand_info->oob_buf[0];
694 memcpy(buf, nand_info->data_buf, mtd->writesize);
697 mxs_nand_return_dma_descs(nand_info);
703 * Write a page to NAND.
705 static int mxs_nand_ecc_write_page(struct mtd_info *mtd,
706 struct nand_chip *nand, const uint8_t *buf,
707 int oob_required, int page)
709 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
710 struct bch_geometry *geo = &nand_info->bch_geometry;
711 struct mxs_dma_desc *d;
712 uint32_t channel = MXS_DMA_CHANNEL_AHB_APBH_GPMI0 + nand_info->cur_chip;
715 memcpy(nand_info->data_buf, buf, mtd->writesize);
716 memcpy(nand_info->oob_buf, nand->oob_poi, mtd->oobsize);
718 /* Handle block mark swapping. */
719 mxs_nand_swap_block_mark(geo, nand_info->data_buf, nand_info->oob_buf);
721 /* Compile the DMA descriptor - write data. */
722 d = mxs_nand_get_dma_desc(nand_info);
724 MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_IRQ |
725 MXS_DMA_DESC_DEC_SEM | MXS_DMA_DESC_WAIT4END |
726 (6 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
730 d->cmd.pio_words[0] =
731 GPMI_CTRL0_COMMAND_MODE_WRITE |
732 GPMI_CTRL0_WORD_LENGTH |
733 (nand_info->cur_chip << GPMI_CTRL0_CS_OFFSET) |
734 GPMI_CTRL0_ADDRESS_NAND_DATA;
735 d->cmd.pio_words[1] = 0;
736 d->cmd.pio_words[2] =
737 GPMI_ECCCTRL_ENABLE_ECC |
738 GPMI_ECCCTRL_ECC_CMD_ENCODE |
739 GPMI_ECCCTRL_BUFFER_MASK_BCH_PAGE;
740 d->cmd.pio_words[3] = (mtd->writesize + mtd->oobsize);
741 d->cmd.pio_words[4] = (dma_addr_t)nand_info->data_buf;
742 d->cmd.pio_words[5] = (dma_addr_t)nand_info->oob_buf;
744 mxs_dma_desc_append(channel, d);
747 mxs_nand_flush_data_buf(nand_info);
749 /* Execute the DMA chain. */
750 ret = mxs_dma_go(channel);
752 printf("MXS NAND: DMA write error\n");
756 ret = mxs_nand_wait_for_bch_complete(nand_info);
758 printf("MXS NAND: BCH write timeout\n");
763 mxs_nand_return_dma_descs(nand_info);
768 * Read OOB from NAND.
770 * This function is a veneer that replaces the function originally installed by
771 * the NAND Flash MTD code.
773 static int mxs_nand_hook_read_oob(struct mtd_info *mtd, loff_t from,
774 struct mtd_oob_ops *ops)
776 struct nand_chip *chip = mtd_to_nand(mtd);
777 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
780 if (ops->mode == MTD_OPS_RAW)
781 nand_info->raw_oob_mode = 1;
783 nand_info->raw_oob_mode = 0;
785 ret = nand_info->hooked_read_oob(mtd, from, ops);
787 nand_info->raw_oob_mode = 0;
795 * This function is a veneer that replaces the function originally installed by
796 * the NAND Flash MTD code.
798 static int mxs_nand_hook_write_oob(struct mtd_info *mtd, loff_t to,
799 struct mtd_oob_ops *ops)
801 struct nand_chip *chip = mtd_to_nand(mtd);
802 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
805 if (ops->mode == MTD_OPS_RAW)
806 nand_info->raw_oob_mode = 1;
808 nand_info->raw_oob_mode = 0;
810 ret = nand_info->hooked_write_oob(mtd, to, ops);
812 nand_info->raw_oob_mode = 0;
818 * Mark a block bad in NAND.
820 * This function is a veneer that replaces the function originally installed by
821 * the NAND Flash MTD code.
823 static int mxs_nand_hook_block_markbad(struct mtd_info *mtd, loff_t ofs)
825 struct nand_chip *chip = mtd_to_nand(mtd);
826 struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
829 nand_info->marking_block_bad = 1;
831 ret = nand_info->hooked_block_markbad(mtd, ofs);
833 nand_info->marking_block_bad = 0;
839 * There are several places in this driver where we have to handle the OOB and
840 * block marks. This is the function where things are the most complicated, so
841 * this is where we try to explain it all. All the other places refer back to
844 * These are the rules, in order of decreasing importance:
846 * 1) Nothing the caller does can be allowed to imperil the block mark, so all
847 * write operations take measures to protect it.
849 * 2) In read operations, the first byte of the OOB we return must reflect the
850 * true state of the block mark, no matter where that block mark appears in
853 * 3) ECC-based read operations return an OOB full of set bits (since we never
854 * allow ECC-based writes to the OOB, it doesn't matter what ECC-based reads
857 * 4) "Raw" read operations return a direct view of the physical bytes in the
858 * page, using the conventional definition of which bytes are data and which
859 * are OOB. This gives the caller a way to see the actual, physical bytes
860 * in the page, without the distortions applied by our ECC engine.
862 * What we do for this specific read operation depends on whether we're doing
863 * "raw" read, or an ECC-based read.
865 * It turns out that knowing whether we want an "ECC-based" or "raw" read is not
866 * easy. When reading a page, for example, the NAND Flash MTD code calls our
867 * ecc.read_page or ecc.read_page_raw function. Thus, the fact that MTD wants an
868 * ECC-based or raw view of the page is implicit in which function it calls
869 * (there is a similar pair of ECC-based/raw functions for writing).
871 * Since MTD assumes the OOB is not covered by ECC, there is no pair of
872 * ECC-based/raw functions for reading or or writing the OOB. The fact that the
873 * caller wants an ECC-based or raw view of the page is not propagated down to
876 * Since our OOB *is* covered by ECC, we need this information. So, we hook the
877 * ecc.read_oob and ecc.write_oob function pointers in the owning
878 * struct mtd_info with our own functions. These hook functions set the
879 * raw_oob_mode field so that, when control finally arrives here, we'll know
882 static int mxs_nand_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *nand,
885 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
888 * First, fill in the OOB buffer. If we're doing a raw read, we need to
889 * get the bytes from the physical page. If we're not doing a raw read,
890 * we need to fill the buffer with set bits.
892 if (nand_info->raw_oob_mode) {
894 * If control arrives here, we're doing a "raw" read. Send the
895 * command to read the conventional OOB and read it.
897 nand->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
898 nand->read_buf(mtd, nand->oob_poi, mtd->oobsize);
901 * If control arrives here, we're not doing a "raw" read. Fill
902 * the OOB buffer with set bits and correct the block mark.
904 memset(nand->oob_poi, 0xff, mtd->oobsize);
906 nand->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
907 mxs_nand_read_buf(mtd, nand->oob_poi, 1);
915 * Write OOB data to NAND.
917 static int mxs_nand_ecc_write_oob(struct mtd_info *mtd, struct nand_chip *nand,
920 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
921 uint8_t block_mark = 0;
924 * There are fundamental incompatibilities between the i.MX GPMI NFC and
925 * the NAND Flash MTD model that make it essentially impossible to write
926 * the out-of-band bytes.
928 * We permit *ONE* exception. If the *intent* of writing the OOB is to
929 * mark a block bad, we can do that.
932 if (!nand_info->marking_block_bad) {
933 printf("NXS NAND: Writing OOB isn't supported\n");
937 /* Write the block mark. */
938 nand->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
939 nand->write_buf(mtd, &block_mark, 1);
940 nand->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
942 /* Check if it worked. */
943 if (nand->waitfunc(mtd, nand) & NAND_STATUS_FAIL)
950 * Claims all blocks are good.
952 * In principle, this function is *only* called when the NAND Flash MTD system
953 * isn't allowed to keep an in-memory bad block table, so it is forced to ask
954 * the driver for bad block information.
956 * In fact, we permit the NAND Flash MTD system to have an in-memory BBT, so
957 * this function is *only* called when we take it away.
959 * Thus, this function is only called when we want *all* blocks to look good,
960 * so it *always* return success.
962 static int mxs_nand_block_bad(struct mtd_info *mtd, loff_t ofs)
968 * At this point, the physical NAND Flash chips have been identified and
969 * counted, so we know the physical geometry. This enables us to make some
970 * important configuration decisions.
972 * The return value of this function propagates directly back to this driver's
973 * board_nand_init(). Anything other than zero will cause this driver to
974 * tear everything down and declare failure.
976 int mxs_nand_setup_ecc(struct mtd_info *mtd)
978 struct nand_chip *nand = mtd_to_nand(mtd);
979 struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
980 struct bch_geometry *geo = &nand_info->bch_geometry;
981 struct mxs_bch_regs *bch_regs = nand_info->bch_regs;
985 if (nand_info->use_minimum_ecc)
986 ret = mxs_nand_calc_ecc_layout_by_info(geo, mtd);
988 if (ret == -ENOTSUPP)
989 ret = mxs_nand_calc_ecc_layout(geo, mtd);
994 mxs_nand_calc_mark_offset(geo, mtd->writesize);
996 /* Configure BCH and set NFC geometry */
997 mxs_reset_block(&bch_regs->hw_bch_ctrl_reg);
999 /* Configure layout 0 */
1000 tmp = (geo->ecc_chunk_count - 1) << BCH_FLASHLAYOUT0_NBLOCKS_OFFSET;
1001 tmp |= MXS_NAND_METADATA_SIZE << BCH_FLASHLAYOUT0_META_SIZE_OFFSET;
1002 tmp |= (geo->ecc_strength >> 1) << BCH_FLASHLAYOUT0_ECC0_OFFSET;
1003 tmp |= geo->ecc_chunk_size >> MXS_NAND_CHUNK_DATA_CHUNK_SIZE_SHIFT;
1004 tmp |= (geo->gf_len == 14 ? 1 : 0) <<
1005 BCH_FLASHLAYOUT0_GF13_0_GF14_1_OFFSET;
1006 writel(tmp, &bch_regs->hw_bch_flash0layout0);
1008 tmp = (mtd->writesize + mtd->oobsize)
1009 << BCH_FLASHLAYOUT1_PAGE_SIZE_OFFSET;
1010 tmp |= (geo->ecc_strength >> 1) << BCH_FLASHLAYOUT1_ECCN_OFFSET;
1011 tmp |= geo->ecc_chunk_size >> MXS_NAND_CHUNK_DATA_CHUNK_SIZE_SHIFT;
1012 tmp |= (geo->gf_len == 14 ? 1 : 0) <<
1013 BCH_FLASHLAYOUT1_GF13_0_GF14_1_OFFSET;
1014 writel(tmp, &bch_regs->hw_bch_flash0layout1);
1016 /* Set *all* chip selects to use layout 0 */
1017 writel(0, &bch_regs->hw_bch_layoutselect);
1019 /* Enable BCH complete interrupt */
1020 writel(BCH_CTRL_COMPLETE_IRQ_EN, &bch_regs->hw_bch_ctrl_set);
1022 /* Hook some operations at the MTD level. */
1023 if (mtd->_read_oob != mxs_nand_hook_read_oob) {
1024 nand_info->hooked_read_oob = mtd->_read_oob;
1025 mtd->_read_oob = mxs_nand_hook_read_oob;
1028 if (mtd->_write_oob != mxs_nand_hook_write_oob) {
1029 nand_info->hooked_write_oob = mtd->_write_oob;
1030 mtd->_write_oob = mxs_nand_hook_write_oob;
1033 if (mtd->_block_markbad != mxs_nand_hook_block_markbad) {
1034 nand_info->hooked_block_markbad = mtd->_block_markbad;
1035 mtd->_block_markbad = mxs_nand_hook_block_markbad;
1042 * Allocate DMA buffers
1044 int mxs_nand_alloc_buffers(struct mxs_nand_info *nand_info)
1047 const int size = NAND_MAX_PAGESIZE + NAND_MAX_OOBSIZE;
1049 nand_info->data_buf_size = roundup(size, MXS_DMA_ALIGNMENT);
1052 buf = memalign(MXS_DMA_ALIGNMENT, nand_info->data_buf_size);
1054 printf("MXS NAND: Error allocating DMA buffers\n");
1058 memset(buf, 0, nand_info->data_buf_size);
1060 nand_info->data_buf = buf;
1061 nand_info->oob_buf = buf + NAND_MAX_PAGESIZE;
1062 /* Command buffers */
1063 nand_info->cmd_buf = memalign(MXS_DMA_ALIGNMENT,
1064 MXS_NAND_COMMAND_BUFFER_SIZE);
1065 if (!nand_info->cmd_buf) {
1067 printf("MXS NAND: Error allocating command buffers\n");
1070 memset(nand_info->cmd_buf, 0, MXS_NAND_COMMAND_BUFFER_SIZE);
1071 nand_info->cmd_queue_len = 0;
1077 * Initializes the NFC hardware.
1079 int mxs_nand_init_dma(struct mxs_nand_info *info)
1081 int i = 0, j, ret = 0;
1083 info->desc = malloc(sizeof(struct mxs_dma_desc *) *
1084 MXS_NAND_DMA_DESCRIPTOR_COUNT);
1090 /* Allocate the DMA descriptors. */
1091 for (i = 0; i < MXS_NAND_DMA_DESCRIPTOR_COUNT; i++) {
1092 info->desc[i] = mxs_dma_desc_alloc();
1093 if (!info->desc[i]) {
1099 /* Init the DMA controller. */
1101 for (j = MXS_DMA_CHANNEL_AHB_APBH_GPMI0;
1102 j <= MXS_DMA_CHANNEL_AHB_APBH_GPMI7; j++) {
1103 ret = mxs_dma_init_channel(j);
1108 /* Reset the GPMI block. */
1109 mxs_reset_block(&info->gpmi_regs->hw_gpmi_ctrl0_reg);
1110 mxs_reset_block(&info->bch_regs->hw_bch_ctrl_reg);
1113 * Choose NAND mode, set IRQ polarity, disable write protection and
1116 clrsetbits_le32(&info->gpmi_regs->hw_gpmi_ctrl1,
1117 GPMI_CTRL1_GPMI_MODE,
1118 GPMI_CTRL1_ATA_IRQRDY_POLARITY | GPMI_CTRL1_DEV_RESET |
1119 GPMI_CTRL1_BCH_MODE);
1124 for (--j; j >= MXS_DMA_CHANNEL_AHB_APBH_GPMI0; j--)
1127 for (--i; i >= 0; i--)
1128 mxs_dma_desc_free(info->desc[i]);
1132 printf("MXS NAND: Unable to allocate DMA descriptors\n");
1136 int mxs_nand_init_spl(struct nand_chip *nand)
1138 struct mxs_nand_info *nand_info;
1141 nand_info = malloc(sizeof(struct mxs_nand_info));
1143 printf("MXS NAND: Failed to allocate private data\n");
1146 memset(nand_info, 0, sizeof(struct mxs_nand_info));
1148 nand_info->gpmi_regs = (struct mxs_gpmi_regs *)MXS_GPMI_BASE;
1149 nand_info->bch_regs = (struct mxs_bch_regs *)MXS_BCH_BASE;
1150 err = mxs_nand_alloc_buffers(nand_info);
1154 err = mxs_nand_init_dma(nand_info);
1158 nand_set_controller_data(nand, nand_info);
1160 nand->options |= NAND_NO_SUBPAGE_WRITE;
1162 nand->cmd_ctrl = mxs_nand_cmd_ctrl;
1163 nand->dev_ready = mxs_nand_device_ready;
1164 nand->select_chip = mxs_nand_select_chip;
1166 nand->read_byte = mxs_nand_read_byte;
1167 nand->read_buf = mxs_nand_read_buf;
1169 nand->ecc.read_page = mxs_nand_ecc_read_page;
1171 nand->ecc.mode = NAND_ECC_HW;
1172 nand->ecc.bytes = 9;
1173 nand->ecc.size = 512;
1174 nand->ecc.strength = 8;
1179 int mxs_nand_init_ctrl(struct mxs_nand_info *nand_info)
1181 struct mtd_info *mtd;
1182 struct nand_chip *nand;
1185 nand = &nand_info->chip;
1186 mtd = nand_to_mtd(nand);
1187 err = mxs_nand_alloc_buffers(nand_info);
1191 err = mxs_nand_init_dma(nand_info);
1193 goto err_free_buffers;
1195 memset(&fake_ecc_layout, 0, sizeof(fake_ecc_layout));
1197 #ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
1198 nand->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
1201 nand_set_controller_data(nand, nand_info);
1202 nand->options |= NAND_NO_SUBPAGE_WRITE;
1205 nand->flash_node = dev_of_offset(nand_info->dev);
1207 nand->cmd_ctrl = mxs_nand_cmd_ctrl;
1209 nand->dev_ready = mxs_nand_device_ready;
1210 nand->select_chip = mxs_nand_select_chip;
1211 nand->block_bad = mxs_nand_block_bad;
1213 nand->read_byte = mxs_nand_read_byte;
1215 nand->read_buf = mxs_nand_read_buf;
1216 nand->write_buf = mxs_nand_write_buf;
1218 /* first scan to find the device and get the page size */
1219 if (nand_scan_ident(mtd, CONFIG_SYS_MAX_NAND_DEVICE, NULL))
1220 goto err_free_buffers;
1222 if (mxs_nand_setup_ecc(mtd))
1223 goto err_free_buffers;
1225 nand->ecc.read_page = mxs_nand_ecc_read_page;
1226 nand->ecc.write_page = mxs_nand_ecc_write_page;
1227 nand->ecc.read_oob = mxs_nand_ecc_read_oob;
1228 nand->ecc.write_oob = mxs_nand_ecc_write_oob;
1230 nand->ecc.layout = &fake_ecc_layout;
1231 nand->ecc.mode = NAND_ECC_HW;
1232 nand->ecc.size = nand_info->bch_geometry.ecc_chunk_size;
1233 nand->ecc.strength = nand_info->bch_geometry.ecc_strength;
1235 /* second phase scan */
1236 err = nand_scan_tail(mtd);
1238 goto err_free_buffers;
1240 err = nand_register(0, mtd);
1242 goto err_free_buffers;
1247 free(nand_info->data_buf);
1248 free(nand_info->cmd_buf);
1253 #ifndef CONFIG_NAND_MXS_DT
1254 void board_nand_init(void)
1256 struct mxs_nand_info *nand_info;
1258 nand_info = malloc(sizeof(struct mxs_nand_info));
1260 printf("MXS NAND: Failed to allocate private data\n");
1263 memset(nand_info, 0, sizeof(struct mxs_nand_info));
1265 nand_info->gpmi_regs = (struct mxs_gpmi_regs *)MXS_GPMI_BASE;
1266 nand_info->bch_regs = (struct mxs_bch_regs *)MXS_BCH_BASE;
1268 /* Refer to Chapter 17 for i.MX6DQ, Chapter 18 for i.MX6SX */
1269 if (is_mx6sx() || is_mx7())
1270 nand_info->max_ecc_strength_supported = 62;
1272 nand_info->max_ecc_strength_supported = 40;
1274 #ifdef CONFIG_NAND_MXS_USE_MINIMUM_ECC
1275 nand_info->use_minimum_ecc = true;
1278 if (mxs_nand_init_ctrl(nand_info) < 0)