[PATCH v2 03/14] nand: move nand_util.c to NAND core folder
Alexey Romanov
avromanov at salutedevices.com
Tue Jan 9 18:32:15 CET 2024
This is right place for this API. Now, fastboot code uses this
API: these functions should be available regardless of the
selected NAND type (RAW / SPI).
Signed-off-by: Alexey Romanov <avromanov at salutedevices.com>
---
drivers/mtd/nand/Makefile | 2 +-
drivers/mtd/nand/raw/nand_util.c | 511 -----------------------------
drivers/mtd/nand/util.c | 543 +++++++++++++++++++++++++++++++
3 files changed, 544 insertions(+), 512 deletions(-)
create mode 100644 drivers/mtd/nand/util.c
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 96e186600a..301b1bceff 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0+
ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
-nandcore-objs := core.o bbt.o
+nandcore-objs := core.o bbt.o util.o
obj-$(CONFIG_MTD_NAND_CORE) += nandcore.o
obj-$(CONFIG_MTD_RAW_NAND) += raw/
obj-$(CONFIG_MTD_SPI_NAND) += spi/
diff --git a/drivers/mtd/nand/raw/nand_util.c b/drivers/mtd/nand/raw/nand_util.c
index 72cc24f403..9c18ce63b9 100644
--- a/drivers/mtd/nand/raw/nand_util.c
+++ b/drivers/mtd/nand/raw/nand_util.c
@@ -35,7 +35,6 @@
#include <jffs2/jffs2.h>
typedef struct erase_info erase_info_t;
-typedef struct mtd_info mtd_info_t;
/* support only for native endian JFFS2 */
#define cpu_to_je16(x) (x)
@@ -395,513 +394,3 @@ int nand_unlock(struct mtd_info *mtd, loff_t start, size_t length,
return ret;
}
#endif
-
-/**
- * check_skip_len
- *
- * Check if there are any bad blocks, and whether length including bad
- * blocks fits into device
- *
- * @param mtd nand mtd instance
- * @param offset offset in flash
- * @param length image length
- * @param used length of flash needed for the requested length
- * Return: 0 if the image fits and there are no bad blocks
- * 1 if the image fits, but there are bad blocks
- * -1 if the image does not fit
- */
-static int check_skip_len(struct mtd_info *mtd, loff_t offset, size_t length,
- size_t *used)
-{
- size_t len_excl_bad = 0;
- int ret = 0;
-
- while (len_excl_bad < length) {
- size_t block_len, block_off;
- loff_t block_start;
-
- if (offset >= mtd->size)
- return -1;
-
- block_start = offset & ~(loff_t)(mtd->erasesize - 1);
- block_off = offset & (mtd->erasesize - 1);
- block_len = mtd->erasesize - block_off;
-
- if (!nand_block_isbad(mtd, block_start))
- len_excl_bad += block_len;
- else
- ret = 1;
-
- offset += block_len;
- *used += block_len;
- }
-
- /* If the length is not a multiple of block_len, adjust. */
- if (len_excl_bad > length)
- *used -= (len_excl_bad - length);
-
- return ret;
-}
-
-#ifdef CONFIG_CMD_NAND_TRIMFFS
-static size_t drop_ffs(const struct mtd_info *mtd, const u_char *buf,
- const size_t *len)
-{
- size_t l = *len;
- ssize_t i;
-
- for (i = l - 1; i >= 0; i--)
- if (buf[i] != 0xFF)
- break;
-
- /* The resulting length must be aligned to the minimum flash I/O size */
- l = i + 1;
- l = (l + mtd->writesize - 1) / mtd->writesize;
- l *= mtd->writesize;
-
- /*
- * since the input length may be unaligned, prevent access past the end
- * of the buffer
- */
- return min(l, *len);
-}
-#endif
-
-/**
- * nand_verify_page_oob:
- *
- * Verify a page of NAND flash, including the OOB.
- * Reads page of NAND and verifies the contents and OOB against the
- * values in ops.
- *
- * @param mtd nand mtd instance
- * @param ops MTD operations, including data to verify
- * @param ofs offset in flash
- * Return: 0 in case of success
- */
-int nand_verify_page_oob(struct mtd_info *mtd, struct mtd_oob_ops *ops,
- loff_t ofs)
-{
- int rval;
- struct mtd_oob_ops vops;
- size_t verlen = mtd->writesize + mtd->oobsize;
-
- memcpy(&vops, ops, sizeof(vops));
-
- vops.datbuf = memalign(ARCH_DMA_MINALIGN, verlen);
-
- if (!vops.datbuf)
- return -ENOMEM;
-
- vops.oobbuf = vops.datbuf + mtd->writesize;
-
- rval = mtd_read_oob(mtd, ofs, &vops);
- if (!rval)
- rval = memcmp(ops->datbuf, vops.datbuf, vops.len);
- if (!rval)
- rval = memcmp(ops->oobbuf, vops.oobbuf, vops.ooblen);
-
- free(vops.datbuf);
-
- return rval ? -EIO : 0;
-}
-
-/**
- * nand_verify:
- *
- * Verify a region of NAND flash.
- * Reads NAND in page-sized chunks and verifies the contents against
- * the contents of a buffer. The offset into the NAND must be
- * page-aligned, and the function doesn't handle skipping bad blocks.
- *
- * @param mtd nand mtd instance
- * @param ofs offset in flash
- * @param len buffer length
- * @param buf buffer to read from
- * Return: 0 in case of success
- */
-int nand_verify(struct mtd_info *mtd, loff_t ofs, size_t len, u_char *buf)
-{
- int rval = 0;
- size_t verofs;
- size_t verlen = mtd->writesize;
- uint8_t *verbuf = memalign(ARCH_DMA_MINALIGN, verlen);
-
- if (!verbuf)
- return -ENOMEM;
-
- /* Read the NAND back in page-size groups to limit malloc size */
- for (verofs = ofs; verofs < ofs + len;
- verofs += verlen, buf += verlen) {
- verlen = min(mtd->writesize, (uint32_t)(ofs + len - verofs));
- rval = nand_read(mtd, verofs, &verlen, verbuf);
- if (!rval || (rval == -EUCLEAN))
- rval = memcmp(buf, verbuf, verlen);
-
- if (rval)
- break;
- }
-
- free(verbuf);
-
- return rval ? -EIO : 0;
-}
-
-/**
- * nand_write_skip_bad:
- *
- * Write image to NAND flash.
- * Blocks that are marked bad are skipped and the is written to the next
- * block instead as long as the image is short enough to fit even after
- * skipping the bad blocks. Due to bad blocks we may not be able to
- * perform the requested write. In the case where the write would
- * extend beyond the end of the NAND device, both length and actual (if
- * not NULL) are set to 0. In the case where the write would extend
- * beyond the limit we are passed, length is set to 0 and actual is set
- * to the required length.
- *
- * @param mtd nand mtd instance
- * @param offset offset in flash
- * @param length buffer length
- * @param actual set to size required to write length worth of
- * buffer or 0 on error, if not NULL
- * @param lim maximum size that actual may be in order to not
- * exceed the buffer
- * @param buffer buffer to read from
- * @param flags flags modifying the behaviour of the write to NAND
- * Return: 0 in case of success
- */
-int nand_write_skip_bad(struct mtd_info *mtd, loff_t offset, size_t *length,
- size_t *actual, loff_t lim, u_char *buffer, int flags)
-{
- int rval = 0, blocksize;
- size_t left_to_write = *length;
- size_t used_for_write = 0;
- u_char *p_buffer = buffer;
- int need_skip;
-
- if (actual)
- *actual = 0;
-
- blocksize = mtd->erasesize;
-
- /*
- * nand_write() handles unaligned, partial page writes.
- *
- * We allow length to be unaligned, for convenience in
- * using the $filesize variable.
- *
- * However, starting at an unaligned offset makes the
- * semantics of bad block skipping ambiguous (really,
- * you should only start a block skipping access at a
- * partition boundary). So don't try to handle that.
- */
- if ((offset & (mtd->writesize - 1)) != 0) {
- printf("Attempt to write non page-aligned data\n");
- *length = 0;
- return -EINVAL;
- }
-
- need_skip = check_skip_len(mtd, offset, *length, &used_for_write);
-
- if (actual)
- *actual = used_for_write;
-
- if (need_skip < 0) {
- printf("Attempt to write outside the flash area\n");
- *length = 0;
- return -EINVAL;
- }
-
- if (used_for_write > lim) {
- puts("Size of write exceeds partition or device limit\n");
- *length = 0;
- return -EFBIG;
- }
-
- if (!need_skip && !(flags & WITH_DROP_FFS)) {
- rval = nand_write(mtd, offset, length, buffer);
-
- if ((flags & WITH_WR_VERIFY) && !rval)
- rval = nand_verify(mtd, offset, *length, buffer);
-
- if (rval == 0)
- return 0;
-
- *length = 0;
- printf("NAND write to offset %llx failed %d\n",
- offset, rval);
- return rval;
- }
-
- while (left_to_write > 0) {
- loff_t block_start = offset & ~(loff_t)(mtd->erasesize - 1);
- size_t block_offset = offset & (mtd->erasesize - 1);
- size_t write_size, truncated_write_size;
-
- schedule();
-
- if (nand_block_isbad(mtd, block_start)) {
- printf("Skip bad block 0x%08llx\n", block_start);
- offset += mtd->erasesize - block_offset;
- continue;
- }
-
- if (left_to_write < (blocksize - block_offset))
- write_size = left_to_write;
- else
- write_size = blocksize - block_offset;
-
- truncated_write_size = write_size;
-#ifdef CONFIG_CMD_NAND_TRIMFFS
- if (flags & WITH_DROP_FFS)
- truncated_write_size = drop_ffs(mtd, p_buffer,
- &write_size);
-#endif
-
- rval = nand_write(mtd, offset, &truncated_write_size,
- p_buffer);
-
- if ((flags & WITH_WR_VERIFY) && !rval)
- rval = nand_verify(mtd, offset,
- truncated_write_size, p_buffer);
-
- offset += write_size;
- p_buffer += write_size;
-
- if (rval != 0) {
- printf("NAND write to offset %llx failed %d\n",
- offset, rval);
- *length -= left_to_write;
- return rval;
- }
-
- left_to_write -= write_size;
- }
-
- return 0;
-}
-
-/**
- * nand_read_skip_bad:
- *
- * Read image from NAND flash.
- * Blocks that are marked bad are skipped and the next block is read
- * instead as long as the image is short enough to fit even after
- * skipping the bad blocks. Due to bad blocks we may not be able to
- * perform the requested read. In the case where the read would extend
- * beyond the end of the NAND device, both length and actual (if not
- * NULL) are set to 0. In the case where the read would extend beyond
- * the limit we are passed, length is set to 0 and actual is set to the
- * required length.
- *
- * @param mtd nand mtd instance
- * @param offset offset in flash
- * @param length buffer length, on return holds number of read bytes
- * @param actual set to size required to read length worth of buffer or 0
- * on error, if not NULL
- * @param lim maximum size that actual may be in order to not exceed the
- * buffer
- * @param buffer buffer to write to
- * Return: 0 in case of success
- */
-int nand_read_skip_bad(struct mtd_info *mtd, loff_t offset, size_t *length,
- size_t *actual, loff_t lim, u_char *buffer)
-{
- int rval;
- size_t left_to_read = *length;
- size_t used_for_read = 0;
- u_char *p_buffer = buffer;
- int need_skip;
-
- if ((offset & (mtd->writesize - 1)) != 0) {
- printf("Attempt to read non page-aligned data\n");
- *length = 0;
- if (actual)
- *actual = 0;
- return -EINVAL;
- }
-
- need_skip = check_skip_len(mtd, offset, *length, &used_for_read);
-
- if (actual)
- *actual = used_for_read;
-
- if (need_skip < 0) {
- printf("Attempt to read outside the flash area\n");
- *length = 0;
- return -EINVAL;
- }
-
- if (used_for_read > lim) {
- puts("Size of read exceeds partition or device limit\n");
- *length = 0;
- return -EFBIG;
- }
-
- if (!need_skip) {
- rval = nand_read(mtd, offset, length, buffer);
- if (!rval || rval == -EUCLEAN)
- return 0;
-
- *length = 0;
- printf("NAND read from offset %llx failed %d\n",
- offset, rval);
- return rval;
- }
-
- while (left_to_read > 0) {
- size_t block_offset = offset & (mtd->erasesize - 1);
- size_t read_length;
-
- schedule();
-
- if (nand_block_isbad(mtd, offset & ~(mtd->erasesize - 1))) {
- printf("Skipping bad block 0x%08llx\n",
- offset & ~(mtd->erasesize - 1));
- offset += mtd->erasesize - block_offset;
- continue;
- }
-
- if (left_to_read < (mtd->erasesize - block_offset))
- read_length = left_to_read;
- else
- read_length = mtd->erasesize - block_offset;
-
- rval = nand_read(mtd, offset, &read_length, p_buffer);
- if (rval && rval != -EUCLEAN) {
- printf("NAND read from offset %llx failed %d\n",
- offset, rval);
- *length -= left_to_read;
- return rval;
- }
-
- left_to_read -= read_length;
- offset += read_length;
- p_buffer += read_length;
- }
-
- return 0;
-}
-
-#ifdef CONFIG_CMD_NAND_TORTURE
-
-/**
- * check_pattern:
- *
- * Check if buffer contains only a certain byte pattern.
- *
- * @param buf buffer to check
- * @param patt the pattern to check
- * @param size buffer size in bytes
- * Return: 1 if there are only patt bytes in buf
- * 0 if something else was found
- */
-static int check_pattern(const u_char *buf, u_char patt, int size)
-{
- int i;
-
- for (i = 0; i < size; i++)
- if (buf[i] != patt)
- return 0;
- return 1;
-}
-
-/**
- * nand_torture:
- *
- * Torture a block of NAND flash.
- * This is useful to determine if a block that caused a write error is still
- * good or should be marked as bad.
- *
- * @param mtd nand mtd instance
- * @param offset offset in flash
- * Return: 0 if the block is still good
- */
-int nand_torture(struct mtd_info *mtd, loff_t offset)
-{
- u_char patterns[] = {0xa5, 0x5a, 0x00};
- struct erase_info instr = {
- .mtd = mtd,
- .addr = offset,
- .len = mtd->erasesize,
- };
- size_t retlen;
- int err, ret = -1, i, patt_count;
- u_char *buf;
-
- if ((offset & (mtd->erasesize - 1)) != 0) {
- puts("Attempt to torture a block at a non block-aligned offset\n");
- return -EINVAL;
- }
-
- if (offset + mtd->erasesize > mtd->size) {
- puts("Attempt to torture a block outside the flash area\n");
- return -EINVAL;
- }
-
- patt_count = ARRAY_SIZE(patterns);
-
- buf = malloc_cache_aligned(mtd->erasesize);
- if (buf == NULL) {
- puts("Out of memory for erase block buffer\n");
- return -ENOMEM;
- }
-
- for (i = 0; i < patt_count; i++) {
- err = mtd_erase(mtd, &instr);
- if (err) {
- printf("%s: erase() failed for block at 0x%llx: %d\n",
- mtd->name, instr.addr, err);
- goto out;
- }
-
- /* Make sure the block contains only 0xff bytes */
- err = mtd_read(mtd, offset, mtd->erasesize, &retlen, buf);
- if ((err && err != -EUCLEAN) || retlen != mtd->erasesize) {
- printf("%s: read() failed for block at 0x%llx: %d\n",
- mtd->name, instr.addr, err);
- goto out;
- }
-
- err = check_pattern(buf, 0xff, mtd->erasesize);
- if (!err) {
- printf("Erased block at 0x%llx, but a non-0xff byte was found\n",
- offset);
- ret = -EIO;
- goto out;
- }
-
- /* Write a pattern and check it */
- memset(buf, patterns[i], mtd->erasesize);
- err = mtd_write(mtd, offset, mtd->erasesize, &retlen, buf);
- if (err || retlen != mtd->erasesize) {
- printf("%s: write() failed for block at 0x%llx: %d\n",
- mtd->name, instr.addr, err);
- goto out;
- }
-
- err = mtd_read(mtd, offset, mtd->erasesize, &retlen, buf);
- if ((err && err != -EUCLEAN) || retlen != mtd->erasesize) {
- printf("%s: read() failed for block at 0x%llx: %d\n",
- mtd->name, instr.addr, err);
- goto out;
- }
-
- err = check_pattern(buf, patterns[i], mtd->erasesize);
- if (!err) {
- printf("Pattern 0x%.2x checking failed for block at "
- "0x%llx\n", patterns[i], offset);
- ret = -EIO;
- goto out;
- }
- }
-
- ret = 0;
-
-out:
- free(buf);
- return ret;
-}
-
-#endif
diff --git a/drivers/mtd/nand/util.c b/drivers/mtd/nand/util.c
new file mode 100644
index 0000000000..4a372bb67d
--- /dev/null
+++ b/drivers/mtd/nand/util.c
@@ -0,0 +1,543 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * drivers/mtd/nand/util.c
+ *
+ * Copyright (C) 2006 by Weiss-Electronic GmbH.
+ * All rights reserved.
+ *
+ * @author: Guido Classen <clagix at gmail.com>
+ * @descr: NAND Flash support
+ * @references: borrowed heavily from Linux mtd-utils code:
+ * flash_eraseall.c by Arcom Control System Ltd
+ * nandwrite.c by Steven J. Hill (sjhill at realitydiluted.com)
+ * and Thomas Gleixner (tglx at linutronix.de)
+ *
+ * Copyright (C) 2008 Nokia Corporation: drop_ffs() function by
+ * Artem Bityutskiy <dedekind1 at gmail.com> from mtd-utils
+ *
+ * Copyright 2010 Freescale Semiconductor
+ */
+
+#include <common.h>
+#include <command.h>
+#include <log.h>
+#include <watchdog.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <div64.h>
+#include <asm/cache.h>
+#include <dm/devres.h>
+
+#include <linux/errno.h>
+#include <linux/mtd/mtd.h>
+#include <nand.h>
+
+/**
+ * check_skip_len
+ *
+ * Check if there are any bad blocks, and whether length including bad
+ * blocks fits into device
+ *
+ * @param mtd nand mtd instance
+ * @param offset offset in flash
+ * @param length image length
+ * @param used length of flash needed for the requested length
+ * Return: 0 if the image fits and there are no bad blocks
+ * 1 if the image fits, but there are bad blocks
+ * -1 if the image does not fit
+ */
+static int check_skip_len(struct mtd_info *mtd, loff_t offset, size_t length,
+ size_t *used)
+{
+ size_t len_excl_bad = 0;
+ int ret = 0;
+
+ while (len_excl_bad < length) {
+ size_t block_len, block_off;
+ loff_t block_start;
+
+ if (offset >= mtd->size)
+ return -1;
+
+ block_start = offset & ~(loff_t)(mtd->erasesize - 1);
+ block_off = offset & (mtd->erasesize - 1);
+ block_len = mtd->erasesize - block_off;
+
+ if (!nand_block_isbad(mtd, block_start))
+ len_excl_bad += block_len;
+ else
+ ret = 1;
+
+ offset += block_len;
+ *used += block_len;
+ }
+
+ /* If the length is not a multiple of block_len, adjust. */
+ if (len_excl_bad > length)
+ *used -= (len_excl_bad - length);
+
+ return ret;
+}
+
+#ifdef CONFIG_CMD_NAND_TRIMFFS
+static size_t drop_ffs(const struct mtd_info *mtd, const u_char *buf,
+ const size_t *len)
+{
+ size_t l = *len;
+ ssize_t i;
+
+ for (i = l - 1; i >= 0; i--)
+ if (buf[i] != 0xFF)
+ break;
+
+ /* The resulting length must be aligned to the minimum flash I/O size */
+ l = i + 1;
+ l = (l + mtd->writesize - 1) / mtd->writesize;
+ l *= mtd->writesize;
+
+ /*
+ * since the input length may be unaligned, prevent access past the end
+ * of the buffer
+ */
+ return min(l, *len);
+}
+#endif
+
+/**
+ * nand_verify_page_oob:
+ *
+ * Verify a page of NAND flash, including the OOB.
+ * Reads page of NAND and verifies the contents and OOB against the
+ * values in ops.
+ *
+ * @param mtd nand mtd instance
+ * @param ops MTD operations, including data to verify
+ * @param ofs offset in flash
+ * Return: 0 in case of success
+ */
+int nand_verify_page_oob(struct mtd_info *mtd, struct mtd_oob_ops *ops,
+ loff_t ofs)
+{
+ int rval;
+ struct mtd_oob_ops vops;
+ size_t verlen = mtd->writesize + mtd->oobsize;
+
+ memcpy(&vops, ops, sizeof(vops));
+
+ vops.datbuf = memalign(ARCH_DMA_MINALIGN, verlen);
+
+ if (!vops.datbuf)
+ return -ENOMEM;
+
+ vops.oobbuf = vops.datbuf + mtd->writesize;
+
+ rval = mtd_read_oob(mtd, ofs, &vops);
+ if (!rval)
+ rval = memcmp(ops->datbuf, vops.datbuf, vops.len);
+ if (!rval)
+ rval = memcmp(ops->oobbuf, vops.oobbuf, vops.ooblen);
+
+ free(vops.datbuf);
+
+ return rval ? -EIO : 0;
+}
+
+/**
+ * nand_verify:
+ *
+ * Verify a region of NAND flash.
+ * Reads NAND in page-sized chunks and verifies the contents against
+ * the contents of a buffer. The offset into the NAND must be
+ * page-aligned, and the function doesn't handle skipping bad blocks.
+ *
+ * @param mtd nand mtd instance
+ * @param ofs offset in flash
+ * @param len buffer length
+ * @param buf buffer to read from
+ * Return: 0 in case of success
+ */
+int nand_verify(struct mtd_info *mtd, loff_t ofs, size_t len, u_char *buf)
+{
+ int rval = 0;
+ size_t verofs;
+ size_t verlen = mtd->writesize;
+ uint8_t *verbuf = memalign(ARCH_DMA_MINALIGN, verlen);
+
+ if (!verbuf)
+ return -ENOMEM;
+
+ /* Read the NAND back in page-size groups to limit malloc size */
+ for (verofs = ofs; verofs < ofs + len;
+ verofs += verlen, buf += verlen) {
+ verlen = min(mtd->writesize, (uint32_t)(ofs + len - verofs));
+ rval = nand_read(mtd, verofs, &verlen, verbuf);
+ if (!rval || (rval == -EUCLEAN))
+ rval = memcmp(buf, verbuf, verlen);
+
+ if (rval)
+ break;
+ }
+
+ free(verbuf);
+
+ return rval ? -EIO : 0;
+}
+
+/**
+ * nand_write_skip_bad:
+ *
+ * Write image to NAND flash.
+ * Blocks that are marked bad are skipped and the is written to the next
+ * block instead as long as the image is short enough to fit even after
+ * skipping the bad blocks. Due to bad blocks we may not be able to
+ * perform the requested write. In the case where the write would
+ * extend beyond the end of the NAND device, both length and actual (if
+ * not NULL) are set to 0. In the case where the write would extend
+ * beyond the limit we are passed, length is set to 0 and actual is set
+ * to the required length.
+ *
+ * @param mtd nand mtd instance
+ * @param offset offset in flash
+ * @param length buffer length
+ * @param actual set to size required to write length worth of
+ * buffer or 0 on error, if not NULL
+ * @param lim maximum size that actual may be in order to not
+ * exceed the buffer
+ * @param buffer buffer to read from
+ * @param flags flags modifying the behaviour of the write to NAND
+ * Return: 0 in case of success
+ */
+int nand_write_skip_bad(struct mtd_info *mtd, loff_t offset, size_t *length,
+ size_t *actual, loff_t lim, u_char *buffer, int flags)
+{
+ int rval = 0, blocksize;
+ size_t left_to_write = *length;
+ size_t used_for_write = 0;
+ u_char *p_buffer = buffer;
+ int need_skip;
+
+ if (actual)
+ *actual = 0;
+
+ blocksize = mtd->erasesize;
+
+ /*
+ * nand_write() handles unaligned, partial page writes.
+ *
+ * We allow length to be unaligned, for convenience in
+ * using the $filesize variable.
+ *
+ * However, starting at an unaligned offset makes the
+ * semantics of bad block skipping ambiguous (really,
+ * you should only start a block skipping access at a
+ * partition boundary). So don't try to handle that.
+ */
+ if ((offset & (mtd->writesize - 1)) != 0) {
+ printf("Attempt to write non page-aligned data\n");
+ *length = 0;
+ return -EINVAL;
+ }
+
+ need_skip = check_skip_len(mtd, offset, *length, &used_for_write);
+
+ if (actual)
+ *actual = used_for_write;
+
+ if (need_skip < 0) {
+ printf("Attempt to write outside the flash area\n");
+ *length = 0;
+ return -EINVAL;
+ }
+
+ if (used_for_write > lim) {
+ puts("Size of write exceeds partition or device limit\n");
+ *length = 0;
+ return -EFBIG;
+ }
+
+ if (!need_skip && !(flags & WITH_DROP_FFS)) {
+ rval = nand_write(mtd, offset, length, buffer);
+
+ if ((flags & WITH_WR_VERIFY) && !rval)
+ rval = nand_verify(mtd, offset, *length, buffer);
+
+ if (rval == 0)
+ return 0;
+
+ *length = 0;
+ printf("NAND write to offset %llx failed %d\n",
+ offset, rval);
+ return rval;
+ }
+
+ while (left_to_write > 0) {
+ loff_t block_start = offset & ~(loff_t)(mtd->erasesize - 1);
+ size_t block_offset = offset & (mtd->erasesize - 1);
+ size_t write_size, truncated_write_size;
+
+ schedule();
+
+ if (nand_block_isbad(mtd, block_start)) {
+ printf("Skip bad block 0x%08llx\n", block_start);
+ offset += mtd->erasesize - block_offset;
+ continue;
+ }
+
+ if (left_to_write < (blocksize - block_offset))
+ write_size = left_to_write;
+ else
+ write_size = blocksize - block_offset;
+
+ truncated_write_size = write_size;
+#ifdef CONFIG_CMD_NAND_TRIMFFS
+ if (flags & WITH_DROP_FFS)
+ truncated_write_size = drop_ffs(mtd, p_buffer,
+ &write_size);
+#endif
+
+ rval = nand_write(mtd, offset, &truncated_write_size,
+ p_buffer);
+
+ if ((flags & WITH_WR_VERIFY) && !rval)
+ rval = nand_verify(mtd, offset,
+ truncated_write_size, p_buffer);
+
+ offset += write_size;
+ p_buffer += write_size;
+
+ if (rval != 0) {
+ printf("NAND write to offset %llx failed %d\n",
+ offset, rval);
+ *length -= left_to_write;
+ return rval;
+ }
+
+ left_to_write -= write_size;
+ }
+
+ return 0;
+}
+
+/**
+ * nand_read_skip_bad:
+ *
+ * Read image from NAND flash.
+ * Blocks that are marked bad are skipped and the next block is read
+ * instead as long as the image is short enough to fit even after
+ * skipping the bad blocks. Due to bad blocks we may not be able to
+ * perform the requested read. In the case where the read would extend
+ * beyond the end of the NAND device, both length and actual (if not
+ * NULL) are set to 0. In the case where the read would extend beyond
+ * the limit we are passed, length is set to 0 and actual is set to the
+ * required length.
+ *
+ * @param mtd nand mtd instance
+ * @param offset offset in flash
+ * @param length buffer length, on return holds number of read bytes
+ * @param actual set to size required to read length worth of buffer or 0
+ * on error, if not NULL
+ * @param lim maximum size that actual may be in order to not exceed the
+ * buffer
+ * @param buffer buffer to write to
+ * Return: 0 in case of success
+ */
+int nand_read_skip_bad(struct mtd_info *mtd, loff_t offset, size_t *length,
+ size_t *actual, loff_t lim, u_char *buffer)
+{
+ int rval;
+ size_t left_to_read = *length;
+ size_t used_for_read = 0;
+ u_char *p_buffer = buffer;
+ int need_skip;
+
+ if ((offset & (mtd->writesize - 1)) != 0) {
+ printf("Attempt to read non page-aligned data\n");
+ *length = 0;
+ if (actual)
+ *actual = 0;
+ return -EINVAL;
+ }
+
+ need_skip = check_skip_len(mtd, offset, *length, &used_for_read);
+
+ if (actual)
+ *actual = used_for_read;
+
+ if (need_skip < 0) {
+ printf("Attempt to read outside the flash area\n");
+ *length = 0;
+ return -EINVAL;
+ }
+
+ if (used_for_read > lim) {
+ puts("Size of read exceeds partition or device limit\n");
+ *length = 0;
+ return -EFBIG;
+ }
+
+ if (!need_skip) {
+ rval = nand_read(mtd, offset, length, buffer);
+ if (!rval || rval == -EUCLEAN)
+ return 0;
+
+ *length = 0;
+ printf("NAND read from offset %llx failed %d\n",
+ offset, rval);
+ return rval;
+ }
+
+ while (left_to_read > 0) {
+ size_t block_offset = offset & (mtd->erasesize - 1);
+ size_t read_length;
+
+ schedule();
+
+ if (nand_block_isbad(mtd, offset & ~(mtd->erasesize - 1))) {
+ printf("Skipping bad block 0x%08llx\n",
+ offset & ~(mtd->erasesize - 1));
+ offset += mtd->erasesize - block_offset;
+ continue;
+ }
+
+ if (left_to_read < (mtd->erasesize - block_offset))
+ read_length = left_to_read;
+ else
+ read_length = mtd->erasesize - block_offset;
+
+ rval = nand_read(mtd, offset, &read_length, p_buffer);
+ if (rval && rval != -EUCLEAN) {
+ printf("NAND read from offset %llx failed %d\n",
+ offset, rval);
+ *length -= left_to_read;
+ return rval;
+ }
+
+ left_to_read -= read_length;
+ offset += read_length;
+ p_buffer += read_length;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_CMD_NAND_TORTURE
+
+/**
+ * check_pattern:
+ *
+ * Check if buffer contains only a certain byte pattern.
+ *
+ * @param buf buffer to check
+ * @param patt the pattern to check
+ * @param size buffer size in bytes
+ * Return: 1 if there are only patt bytes in buf
+ * 0 if something else was found
+ */
+static int check_pattern(const u_char *buf, u_char patt, int size)
+{
+ int i;
+
+ for (i = 0; i < size; i++)
+ if (buf[i] != patt)
+ return 0;
+ return 1;
+}
+
+/**
+ * nand_torture:
+ *
+ * Torture a block of NAND flash.
+ * This is useful to determine if a block that caused a write error is still
+ * good or should be marked as bad.
+ *
+ * @param mtd nand mtd instance
+ * @param offset offset in flash
+ * Return: 0 if the block is still good
+ */
+int nand_torture(struct mtd_info *mtd, loff_t offset)
+{
+ u_char patterns[] = {0xa5, 0x5a, 0x00};
+ struct erase_info instr = {
+ .mtd = mtd,
+ .addr = offset,
+ .len = mtd->erasesize,
+ };
+ size_t retlen;
+ int err, ret = -1, i, patt_count;
+ u_char *buf;
+
+ if ((offset & (mtd->erasesize - 1)) != 0) {
+ puts("Attempt to torture a block at a non block-aligned offset\n");
+ return -EINVAL;
+ }
+
+ if (offset + mtd->erasesize > mtd->size) {
+ puts("Attempt to torture a block outside the flash area\n");
+ return -EINVAL;
+ }
+
+ patt_count = ARRAY_SIZE(patterns);
+
+ buf = malloc_cache_aligned(mtd->erasesize);
+ if (buf == NULL) {
+ puts("Out of memory for erase block buffer\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < patt_count; i++) {
+ err = mtd_erase(mtd, &instr);
+ if (err) {
+ printf("%s: erase() failed for block at 0x%llx: %d\n",
+ mtd->name, instr.addr, err);
+ goto out;
+ }
+
+ /* Make sure the block contains only 0xff bytes */
+ err = mtd_read(mtd, offset, mtd->erasesize, &retlen, buf);
+ if ((err && err != -EUCLEAN) || retlen != mtd->erasesize) {
+ printf("%s: read() failed for block at 0x%llx: %d\n",
+ mtd->name, instr.addr, err);
+ goto out;
+ }
+
+ err = check_pattern(buf, 0xff, mtd->erasesize);
+ if (!err) {
+ printf("Erased block at 0x%llx, but a non-0xff byte was found\n",
+ offset);
+ ret = -EIO;
+ goto out;
+ }
+
+ /* Write a pattern and check it */
+ memset(buf, patterns[i], mtd->erasesize);
+ err = mtd_write(mtd, offset, mtd->erasesize, &retlen, buf);
+ if (err || retlen != mtd->erasesize) {
+ printf("%s: write() failed for block at 0x%llx: %d\n",
+ mtd->name, instr.addr, err);
+ goto out;
+ }
+
+ err = mtd_read(mtd, offset, mtd->erasesize, &retlen, buf);
+ if ((err && err != -EUCLEAN) || retlen != mtd->erasesize) {
+ printf("%s: read() failed for block at 0x%llx: %d\n",
+ mtd->name, instr.addr, err);
+ goto out;
+ }
+
+ err = check_pattern(buf, patterns[i], mtd->erasesize);
+ if (!err) {
+ printf("Pattern 0x%.2x checking failed for block at "
+ "0x%llx\n", patterns[i], offset);
+ ret = -EIO;
+ goto out;
+ }
+ }
+
+ ret = 0;
+
+out:
+ free(buf);
+ return ret;
+}
+
+#endif
--
2.30.1
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