[PATCH v2 1/3] mtd: nand: extract some onfi functions to nandcore

From: Chuanhong Guo
Date: Thu Apr 14 2022 - 23:49:25 EST

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These functions will be shared between raw nand and spi nand.
Extract them into mtd/nand/onfi.c.

Signed-off-by: Chuanhong Guo <gch981213@xxxxxxxxx>
---
Change since v1: new patch

drivers/mtd/nand/Makefile | 2 +-
drivers/mtd/nand/onfi.c | 115 ++++++++++++++++++++++++++++++
drivers/mtd/nand/raw/internals.h | 1 -
drivers/mtd/nand/raw/nand_base.c | 18 -----
drivers/mtd/nand/raw/nand_jedec.c | 4 +-
drivers/mtd/nand/raw/nand_onfi.c | 70 ++----------------
include/linux/mtd/onfi.h | 8 +++
7 files changed, 130 insertions(+), 88 deletions(-)
create mode 100644 drivers/mtd/nand/onfi.c

diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 19e1291ac4d5..4251be5e655d 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0

-nandcore-objs := core.o bbt.o
+nandcore-objs := core.o bbt.o onfi.o
obj-$(CONFIG_MTD_NAND_CORE) += nandcore.o
obj-$(CONFIG_MTD_NAND_ECC_MEDIATEK) += ecc-mtk.o

diff --git a/drivers/mtd/nand/onfi.c b/drivers/mtd/nand/onfi.c
new file mode 100644
index 000000000000..bc8020cf70a9
--- /dev/null
+++ b/drivers/mtd/nand/onfi.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ONFI helpers shared between raw nand and spi nand support
+ */
+#include <linux/mtd/onfi.h>
+
+/**
+ * onfi_bit_wise_majority() - recover data from multiple copies using bit-wise
+ * majority
+ *
+ * @srcbufs: array of pointers to multiple copies
+ * @nsrcbufs: number of copies
+ * @dstbuf: pointer to the destination buffer
+ * @bufsize: length of data to recover
+ */
+void onfi_bit_wise_majority(const void **srcbufs, unsigned int nsrcbufs,
+ void *dstbuf, unsigned int bufsize)
+{
+ int i, j, k;
+
+ for (i = 0; i < bufsize; i++) {
+ u8 val = 0;
+
+ for (j = 0; j < 8; j++) {
+ unsigned int cnt = 0;
+
+ for (k = 0; k < nsrcbufs; k++) {
+ const u8 *srcbuf = srcbufs[k];
+
+ if (srcbuf[i] & BIT(j))
+ cnt++;
+ }
+
+ if (cnt > nsrcbufs / 2)
+ val |= BIT(j);
+ }
+
+ ((u8 *)dstbuf)[i] = val;
+ }
+}
+EXPORT_SYMBOL_GPL(onfi_bit_wise_majority);
+
+/**
+ * onfi_crc16() - calculate CRC16 in ONFI parameter page
+ * @crc: value to start with
+ * @p: data buffer
+ * @len: length of the data
+ */
+u16 onfi_crc16(u16 crc, u8 const *p, size_t len)
+{
+ int i;
+
+ while (len--) {
+ crc ^= *p++ << 8;
+ for (i = 0; i < 8; i++)
+ crc = (crc << 1) ^ ((crc & 0x8000) ? 0x8005 : 0);
+ }
+
+ return crc;
+}
+EXPORT_SYMBOL_GPL(onfi_crc16);
+
+/**
+ * onfi_parse_memorg() - parse nand memory organization from onfi parameters
+ * @p: ONFI parameters
+ * @memorg: nand memory organization struct to write to
+ */
+void onfi_parse_memorg(const struct nand_onfi_params *p,
+ struct nand_memory_organization *memorg)
+{
+ memorg->pagesize = le32_to_cpu(p->byte_per_page);
+
+ /*
+ * pages_per_block and blocks_per_lun may not be a power-of-2 size
+ * (don't ask me who thought of this...). MTD assumes that these
+ * dimensions will be power-of-2, so just truncate the remaining area.
+ */
+ memorg->pages_per_eraseblock =
+ 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1);
+
+ memorg->oobsize = le16_to_cpu(p->spare_bytes_per_page);
+
+ memorg->luns_per_target = p->lun_count;
+ memorg->planes_per_lun = 1 << p->interleaved_bits;
+
+ /* See erasesize comment */
+ memorg->eraseblocks_per_lun =
+ 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1);
+ memorg->max_bad_eraseblocks_per_lun = le32_to_cpu(p->blocks_per_lun);
+ memorg->bits_per_cell = p->bits_per_cell;
+}
+EXPORT_SYMBOL_GPL(onfi_parse_memorg);
+
+/**
+ * onfi_sanitize_string() - Sanitize ONFI strings so we can safely print them
+ * @s: string to sanitize
+ * @len: length of the buffer
+ */
+void onfi_sanitize_string(uint8_t *s, size_t len)
+{
+ ssize_t i;
+
+ /* Null terminate */
+ s[len - 1] = 0;
+
+ /* Remove non printable chars */
+ for (i = 0; i < len - 1; i++) {
+ if (s[i] < ' ' || s[i] > 127)
+ s[i] = '?';
+ }
+
+ /* Remove trailing spaces */
+ strim(s);
+}
+EXPORT_SYMBOL_GPL(onfi_sanitize_string);
diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h
index 7016e0f38398..e41c7d6d2c69 100644
--- a/drivers/mtd/nand/raw/internals.h
+++ b/drivers/mtd/nand/raw/internals.h
@@ -110,7 +110,6 @@ int nand_read_param_page_op(struct nand_chip *chip, u8 page, void *buf,
unsigned int len);
void nand_decode_ext_id(struct nand_chip *chip);
void panic_nand_wait(struct nand_chip *chip, unsigned long timeo);
-void sanitize_string(uint8_t *s, size_t len);

static inline bool nand_has_exec_op(struct nand_chip *chip)
{
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 6b67b7dfe7ce..b11b9042ff25 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4715,24 +4715,6 @@ static void nand_set_defaults(struct nand_chip *chip)
chip->buf_align = 1;
}

-/* Sanitize ONFI strings so we can safely print them */
-void sanitize_string(uint8_t *s, size_t len)
-{
- ssize_t i;
-
- /* Null terminate */
- s[len - 1] = 0;
-
- /* Remove non printable chars */
- for (i = 0; i < len - 1; i++) {
- if (s[i] < ' ' || s[i] > 127)
- s[i] = '?';
- }
-
- /* Remove trailing spaces */
- strim(s);
-}
-
/*
* nand_id_has_period - Check if an ID string has a given wraparound period
* @id_data: the ID string
diff --git a/drivers/mtd/nand/raw/nand_jedec.c b/drivers/mtd/nand/raw/nand_jedec.c
index 85b6d9372d80..e3fc59587da2 100644
--- a/drivers/mtd/nand/raw/nand_jedec.c
+++ b/drivers/mtd/nand/raw/nand_jedec.c
@@ -87,8 +87,8 @@ int nand_jedec_detect(struct nand_chip *chip)
goto free_jedec_param_page;
}

- sanitize_string(p->manufacturer, sizeof(p->manufacturer));
- sanitize_string(p->model, sizeof(p->model));
+ onfi_sanitize_string(p->manufacturer, sizeof(p->manufacturer));
+ onfi_sanitize_string(p->model, sizeof(p->model));
chip->parameters.model = kstrdup(p->model, GFP_KERNEL);
if (!chip->parameters.model) {
ret = -ENOMEM;
diff --git a/drivers/mtd/nand/raw/nand_onfi.c b/drivers/mtd/nand/raw/nand_onfi.c
index 7586befce7f9..1d5734942b08 100644
--- a/drivers/mtd/nand/raw/nand_onfi.c
+++ b/drivers/mtd/nand/raw/nand_onfi.c
@@ -18,18 +18,6 @@

#define ONFI_PARAM_PAGES 3

-u16 onfi_crc16(u16 crc, u8 const *p, size_t len)
-{
- int i;
- while (len--) {
- crc ^= *p++ << 8;
- for (i = 0; i < 8; i++)
- crc = (crc << 1) ^ ((crc & 0x8000) ? 0x8005 : 0);
- }
-
- return crc;
-}
-
/* Parse the Extended Parameter Page. */
static int nand_flash_detect_ext_param_page(struct nand_chip *chip,
struct nand_onfi_params *p)
@@ -107,37 +95,6 @@ static int nand_flash_detect_ext_param_page(struct nand_chip *chip,
return ret;
}

-/*
- * Recover data with bit-wise majority
- */
-static void nand_bit_wise_majority(const void **srcbufs,
- unsigned int nsrcbufs,
- void *dstbuf,
- unsigned int bufsize)
-{
- int i, j, k;
-
- for (i = 0; i < bufsize; i++) {
- u8 val = 0;
-
- for (j = 0; j < 8; j++) {
- unsigned int cnt = 0;
-
- for (k = 0; k < nsrcbufs; k++) {
- const u8 *srcbuf = srcbufs[k];
-
- if (srcbuf[i] & BIT(j))
- cnt++;
- }
-
- if (cnt > nsrcbufs / 2)
- val |= BIT(j);
- }
-
- ((u8 *)dstbuf)[i] = val;
- }
-}
-
/*
* Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise.
*/
@@ -201,7 +158,7 @@ int nand_onfi_detect(struct nand_chip *chip)
srcbufs[j] = pbuf + j;

pr_warn("Could not find a valid ONFI parameter page, trying bit-wise majority to recover it\n");
- nand_bit_wise_majority(srcbufs, ONFI_PARAM_PAGES, pbuf,
+ onfi_bit_wise_majority(srcbufs, ONFI_PARAM_PAGES, pbuf,
sizeof(*pbuf));

crc = onfi_crc16(ONFI_CRC_BASE, (u8 *)pbuf, 254);
@@ -234,38 +191,19 @@ int nand_onfi_detect(struct nand_chip *chip)
goto free_onfi_param_page;
}

- sanitize_string(p->manufacturer, sizeof(p->manufacturer));
- sanitize_string(p->model, sizeof(p->model));
+ onfi_sanitize_string(p->manufacturer, sizeof(p->manufacturer));
+ onfi_sanitize_string(p->model, sizeof(p->model));
chip->parameters.model = kstrdup(p->model, GFP_KERNEL);
if (!chip->parameters.model) {
ret = -ENOMEM;
goto free_onfi_param_page;
}

- memorg->pagesize = le32_to_cpu(p->byte_per_page);
+ onfi_parse_memorg(p, memorg);
mtd->writesize = memorg->pagesize;
-
- /*
- * pages_per_block and blocks_per_lun may not be a power-of-2 size
- * (don't ask me who thought of this...). MTD assumes that these
- * dimensions will be power-of-2, so just truncate the remaining area.
- */
- memorg->pages_per_eraseblock =
- 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1);
mtd->erasesize = memorg->pages_per_eraseblock * memorg->pagesize;
-
- memorg->oobsize = le16_to_cpu(p->spare_bytes_per_page);
mtd->oobsize = memorg->oobsize;

- memorg->luns_per_target = p->lun_count;
- memorg->planes_per_lun = 1 << p->interleaved_bits;
-
- /* See erasesize comment */
- memorg->eraseblocks_per_lun =
- 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1);
- memorg->max_bad_eraseblocks_per_lun = le32_to_cpu(p->blocks_per_lun);
- memorg->bits_per_cell = p->bits_per_cell;
-
if (le16_to_cpu(p->features) & ONFI_FEATURE_16_BIT_BUS)
chip->options |= NAND_BUSWIDTH_16;

diff --git a/include/linux/mtd/onfi.h b/include/linux/mtd/onfi.h
index a7376f9beddf..728d9ee9dabe 100644
--- a/include/linux/mtd/onfi.h
+++ b/include/linux/mtd/onfi.h
@@ -12,6 +12,7 @@

#include <linux/types.h>
#include <linux/bitfield.h>
+#include <linux/mtd/nand.h>

/* ONFI version bits */
#define ONFI_VERSION_1_0 BIT(1)
@@ -186,4 +187,11 @@ struct onfi_params {
u8 vendor[88];
};

+void onfi_bit_wise_majority(const void **srcbufs, unsigned int nsrcbufs,
+ void *dstbuf, unsigned int bufsize);
+u16 onfi_crc16(u16 crc, u8 const *p, size_t len);
+void onfi_parse_memorg(const struct nand_onfi_params *p,
+ struct nand_memory_organization *memorg);
+void onfi_sanitize_string(uint8_t *s, size_t len);
+
#endif /* __LINUX_MTD_ONFI_H */
--
2.35.1

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