linux-kernel - [PATCH 03/12] mtd: nand_bbt: add new API definitions

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Message-ID: <87F60714EC601C4C83DFF1D2E3D390A0326CC872@NTXXIAMBX02.xacn.micron.com>
Date:	Fri, 25 Sep 2015 06:38:50 +0000
From:	Peter Pan 潘栋 (peterpandong) 
	<peterpandong@...ron.com>
To:	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	"fransklaver@...il.com" <fransklaver@...il.com>,
	"wsa@...-dreams.de" <wsa@...-dreams.de>,
	"zajec5@...il.com" <zajec5@...il.com>,
	"boris.brezillon@...e-electrons.com" 
	<boris.brezillon@...e-electrons.com>,
	"baruch@...s.co.il" <baruch@...s.co.il>,
	"ezequiel.garcia@...e-electrons.com" 
	<ezequiel.garcia@...e-electrons.com>,
	"kdasu.kdev@...il.com" <kdasu.kdev@...il.com>,
	"rogerq@...com" <rogerq@...com>,
	"asierra@...-inc.com" <asierra@...-inc.com>, bpqw <bpqw@...ron.com>
CC:	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Frank Liu 刘群 (frankliu) 
	<frankliu@...ron.com>,
	Peter Pan 潘栋 (peterpandong) 
	<peterpandong@...ron.com>, Kamil Debski <Kamil.Debski@...tec.com>,
	"Ionela Voinescu" <Ionela.Voinescu@...tec.com>,
	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>
Subject: [PATCH 03/12] mtd: nand_bbt: add new API definitions

Add new API definitions for nand_bbt to replace old ones without
any users. These API includes:
	int nand_bbt_init(struct nand_bbt *bbt);
	void nand_bbt_release(struct nand_bbt *bbt);
	int nand_bbt_markbad(struct nand_bbt *bbt, loff_t offs);
	int nand_bbt_isreserved(struct nand_bbt *bbt, loff_t offs);
	int nand_bbt_isbad(struct nand_bbt *bbt, loff_t offs);

Signed-off-by: Brian Norris <computersforpeace@...il.com>
---
 drivers/mtd/nand/nand_bbt.c  | 71 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mtd/nand_bbt.h |  6 ++++
 2 files changed, 77 insertions(+)

diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 63a1a36..3b7d1e1 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -1375,3 +1375,74 @@ int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs)
 }
 
 EXPORT_SYMBOL(nand_scan_bbt);
+
+/**
+ * nand_bbt_init - [NAND BBT Interface] Initialize and locate/create a bad block
+ * table
+ * @bbt: NAND BBT structure
+ *
+ * This function selects the default bad block table support for the device and
+ * scans for an existing table, or else creates one.
+ */
+int nand_bbt_init(struct nand_bbt *bbt)
+{
+	/*
+	 * FIXME: For now, we call nand_default_bbt() directly. It will change
+	 * when we use struct nand_bbt instead of struct nand_chip.
+	 */
+	return nand_default_bbt(bbt->mtd);
+}
+EXPORT_SYMBOL(nand_bbt_init);
+
+void nand_bbt_release(struct nand_bbt *bbt)
+{
+	kfree(bbt->bbt);
+}
+EXPORT_SYMBOL(nand_bbt_release);
+
+/**
+ * nand_bbt_isreserved - [NAND BBT Interface] Check if a block is reserved
+ * @bbt: NAND BBT structure
+ * @offs: offset in the device
+ */
+int nand_bbt_isreserved(struct nand_bbt *bbt, loff_t offs)
+{
+	/*
+	 * FIXME: For now, we call nand_isreserved_bbt() directly. It will
+	 * change when we use struct nand_bbt instead of struct nand_chip.
+	 */
+	return nand_isreserved_bbt(bbt->mtd, offs);
+}
+EXPORT_SYMBOL(nand_bbt_isreserved);
+
+/**
+ * nand_bbt_isbad - [NAND BBT Interface] Check if a block is bad
+ * @bbt: NAND BBT structure
+ * @offs: offset in the device
+ */
+int nand_bbt_isbad(struct nand_bbt *bbt, loff_t offs)
+{
+	/*
+	 * FIXME: For now, we call nand_isbad_bbt() directly. It will change
+	 * when we use struct nand_bbt instead of struct nand_chip.
+	 * Since we already have nand_bbt_isreserved(), we don't need to
+	 * check pass down allow_bbt.
+	 */
+	return nand_isbad_bbt(bbt->mtd, offs, 1);
+}
+EXPORT_SYMBOL(nand_bbt_isbad);
+
+/**
+ * nand_bbt_markbad - [NAND BBT Interface] Mark a block bad in the BBT
+ * @bbt: NAND BBT structure
+ * @offs: offset of the bad block
+ */
+int nand_bbt_markbad(struct nand_bbt *bbt, loff_t offs)
+{
+	/*
+	 * FIXME: For now, we call nand_markbad_bbt() directly. It will change
+	 * when we use struct nand_bbt instead of struct nand_chip.
+	 */
+	return nand_markbad_bbt(bbt->mtd, offs);
+}
+EXPORT_SYMBOL(nand_bbt_markbad);
diff --git a/include/linux/mtd/nand_bbt.h b/include/linux/mtd/nand_bbt.h
index e468571..150c49a 100644
--- a/include/linux/mtd/nand_bbt.h
+++ b/include/linux/mtd/nand_bbt.h
@@ -174,4 +174,10 @@ struct nand_bbt {
 	u8 *bbt;
 };
 
+int nand_bbt_init(struct nand_bbt *bbt);
+void nand_bbt_release(struct nand_bbt *bbt);
+int nand_bbt_markbad(struct nand_bbt *bbt, loff_t offs);
+int nand_bbt_isreserved(struct nand_bbt *bbt, loff_t offs);
+int nand_bbt_isbad(struct nand_bbt *bbt, loff_t offs);
+
 #endif	/* __LINUX_MTD_NAND_BBT_H */
-- 
1.9.1