linux-kernel - [PATCH 3/8] mtd: nand: create ONFI table parsing instance

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Message-Id: <20190722055621.23526-4-sshivamurthy@micron.com>
Date:   Mon, 22 Jul 2019 07:56:16 +0200
From:   shiva.linuxworks@...il.com
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Shivamurthy Shastri <sshivamurthy@...ron.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jeff Kletsky <git-commits@...ycomm.com>,
        Chuanhong Guo <gch981213@...il.com>,
        liaoweixiong <liaoweixiong@...winnertech.com>
Subject: [PATCH 3/8] mtd: nand: create ONFI table parsing instance

From: Shivamurthy Shastri <sshivamurthy@...ron.com>

ONFI table parsing is common, as most of the variables are common
between raw and SPI NAND. The parsing function is instantiated in
onfi.c, which fills ONFI parameters into nand_memory_organization.

Signed-off-by: Shivamurthy Shastri <sshivamurthy@...ron.com>
---
 drivers/mtd/nand/onfi.c          | 32 ++++++++++++++++++++++++++++++++
 drivers/mtd/nand/raw/nand_onfi.c | 22 ++--------------------
 include/linux/mtd/onfi.h         |  2 ++
 3 files changed, 36 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/nand/onfi.c b/drivers/mtd/nand/onfi.c
index 7aaf36dfc5e0..e78700894aea 100644
--- a/drivers/mtd/nand/onfi.c
+++ b/drivers/mtd/nand/onfi.c
@@ -87,3 +87,35 @@ void sanitize_string(u8 *s, size_t len)
 	strim(s);
 }
 EXPORT_SYMBOL_GPL(sanitize_string);
+
+/**
+ * fill_nand_memorg() - Parse ONFI table and fill memorg
+ * @memorg: NAND memorg to be filled
+ * @p: ONFI table to be parsed
+ *
+ */
+void parse_onfi_params(struct nand_memory_organization *memorg,
+		       struct nand_onfi_params *p)
+{
+	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(parse_onfi_params);
diff --git a/drivers/mtd/nand/raw/nand_onfi.c b/drivers/mtd/nand/raw/nand_onfi.c
index 2e8edfa636ef..263796d3298c 100644
--- a/drivers/mtd/nand/raw/nand_onfi.c
+++ b/drivers/mtd/nand/raw/nand_onfi.c
@@ -181,30 +181,12 @@ int nand_onfi_detect(struct nand_chip *chip)
 		goto free_onfi_param_page;
 	}
 
-	memorg->pagesize = le32_to_cpu(p->byte_per_page);
-	mtd->writesize = memorg->pagesize;
+	parse_onfi_params(memorg, p);
 
-	/*
-	 * 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->writesize = memorg->pagesize;
 	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 2c8a05a02bb0..4cacf4e9db6d 100644
--- a/include/linux/mtd/onfi.h
+++ b/include/linux/mtd/onfi.h
@@ -183,5 +183,7 @@ void nand_bit_wise_majority(const void **srcbufs,
 			    void *dstbuf,
 			    unsigned int bufsize);
 void sanitize_string(u8 *s, size_t len);
+void parse_onfi_params(struct nand_memory_organization *memorg,
+		       struct nand_onfi_params *p);
 
 #endif /* __LINUX_MTD_ONFI_H */
-- 
2.17.1