[PATCH v2 1/3] mtd: sharpsl: add sharpslpart MTD partition parser

2017-04-22 Thread Andrea Adami 
The Sharp SL Series (Zaurus) PXA handhelds have 16/64/128M of NAND flash
and share the same layout of the first 7M partition, managed by Sharp FTL.

The purpose of this self-contained patch is to add a common parser and
remove the hardcoded sizes in the board files (these devices are not yet
converted to devicetree).
Users will have benefits because the mtdparts= tag will not be necessary
anymore and they will be free to repartition the little sized flash.

The obsolete bootloader can not pass the partitioning info to modern
kernels anymore so it has to be read from flash at known logical addresses.
(see http://www.h5.dion.ne.jp/~rimemoon/zaurus/memo_006.htm )

In kernel, under arch/arm/mach-pxa we have already 8 machines:
MACH_POODLE, MACH_CORGI, MACH_SHEPERD, MACH_HUSKY, MACH_AKITA, MACH_SPITZ,
MACH_BORZOI, MACH_TOSA.
Lost after the 2.4 vendor kernel are MACH_BOXER and MACH_TERRIER.

Almost every model has different factory partitioning: add to this the
units can be repartitioned by users with userspace tools (nandlogical)
and installers for popular (back then) linux distributions.

The Parameter Area in the first (boot) partition extends from 0x0004 to
0x0007bfff (176k) and contains two copies of the partition table:
...
0x0006: Partition Info1 16k
0x00064000: Partition Info2 16k
0x00668000: Model   16k
...

The first 7M partition is managed by the Sharp FTL reserving 5% + 1 blocks
for wear-leveling: some blocks are remapped and one layer of translation
(logical to physical) is necessary.

There isn't much documentation about this FTL in the 2.4 sources, just the
MTD methods for reading and writing using logical addresses and the block
management (wear-leveling, use counter).
For the purpose of the MTD parser only the read part of the code was taken.

The NAND drivers that can use this parser are sharpsl.c and tmio_nand.c.

Signed-off-by: Andrea Adami 
---
 drivers/mtd/Kconfig   |   8 ++
 drivers/mtd/Makefile  |   2 +
 drivers/mtd/sharpsl_ftl.c | 219 ++
 drivers/mtd/sharpsl_ftl.h |  34 +++
 drivers/mtd/sharpslpart.c | 132 
 5 files changed, 395 insertions(+)
 create mode 100644 drivers/mtd/sharpsl_ftl.c
 create mode 100644 drivers/mtd/sharpsl_ftl.h
 create mode 100644 drivers/mtd/sharpslpart.c

diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index e83a279..5c96127 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -155,6 +155,14 @@ config MTD_BCM47XX_PARTS
  This provides partitions parser for devices based on BCM47xx
  boards.
 
+config MTD_SHARPSL_PARTS
+   tristate "Sharp SL Series NAND flash partition parser"
+   depends on MTD_NAND_SHARPSL || MTD_NAND_TMIO
+   help
+ This provides the read-only FTL logic necessary to read the partition
+ table from the NAND flash of Sharp SL Series (Zaurus) and the MTD
+ partition parser using this code.
+
 comment "User Modules And Translation Layers"
 
 #
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index 99bb9a1..89f707b 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -13,6 +13,8 @@ obj-$(CONFIG_MTD_AFS_PARTS)   += afs.o
 obj-$(CONFIG_MTD_AR7_PARTS)+= ar7part.o
 obj-$(CONFIG_MTD_BCM63XX_PARTS)+= bcm63xxpart.o
 obj-$(CONFIG_MTD_BCM47XX_PARTS)+= bcm47xxpart.o
+obj-$(CONFIG_MTD_SHARPSL_PARTS)+= sharpsl-part.o
+sharpsl-part-objs := sharpsl_ftl.o sharpslpart.o
 
 # 'Users' - code which presents functionality to userspace.
 obj-$(CONFIG_MTD_BLKDEVS)  += mtd_blkdevs.o
diff --git a/drivers/mtd/sharpsl_ftl.c b/drivers/mtd/sharpsl_ftl.c
new file mode 100644
index 000..6b82144
--- /dev/null
+++ b/drivers/mtd/sharpsl_ftl.c
@@ -0,0 +1,219 @@
+/*
+ * MTD method for NAND accessing via logical address (SHARP FTL)
+ *
+ * Copyright (C) 2017 Andrea Adami 
+ *
+ * Based on 2.4 sources: drivers/mtd/nand/sharp_sl_logical.c
+ * Copyright (C) 2002  SHARP
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include "sharpsl_ftl.h"
+
+/* oob structure */
+#define NAND_NOOB_LOGADDR_00   8
+#define NAND_NOOB_LOGADDR_01   9
+#define NAND_NOOB_LOGADDR_10   10
+#define NAND_NOOB_LOGADDR_11   11
+#define NAND_NOOB_LOGADDR_20   12
+#define NAND_NOOB_LOGADDR_21   13
+
+/* Logical Table */
+struct mtd_logical {
+   u32 size;

[PATCH v2 1/3] mtd: sharpsl: add sharpslpart MTD partition parser

2017-04-22 Thread Andrea Adami 
The Sharp SL Series (Zaurus) PXA handhelds have 16/64/128M of NAND flash
and share the same layout of the first 7M partition, managed by Sharp FTL.

The purpose of this self-contained patch is to add a common parser and
remove the hardcoded sizes in the board files (these devices are not yet
converted to devicetree).
Users will have benefits because the mtdparts= tag will not be necessary
anymore and they will be free to repartition the little sized flash.

The obsolete bootloader can not pass the partitioning info to modern
kernels anymore so it has to be read from flash at known logical addresses.
(see http://www.h5.dion.ne.jp/~rimemoon/zaurus/memo_006.htm )

In kernel, under arch/arm/mach-pxa we have already 8 machines:
MACH_POODLE, MACH_CORGI, MACH_SHEPERD, MACH_HUSKY, MACH_AKITA, MACH_SPITZ,
MACH_BORZOI, MACH_TOSA.
Lost after the 2.4 vendor kernel are MACH_BOXER and MACH_TERRIER.

Almost every model has different factory partitioning: add to this the
units can be repartitioned by users with userspace tools (nandlogical)
and installers for popular (back then) linux distributions.

The Parameter Area in the first (boot) partition extends from 0x0004 to
0x0007bfff (176k) and contains two copies of the partition table:
...
0x0006: Partition Info1 16k
0x00064000: Partition Info2 16k
0x00668000: Model   16k
...

The first 7M partition is managed by the Sharp FTL reserving 5% + 1 blocks
for wear-leveling: some blocks are remapped and one layer of translation
(logical to physical) is necessary.

There isn't much documentation about this FTL in the 2.4 sources, just the
MTD methods for reading and writing using logical addresses and the block
management (wear-leveling, use counter).
For the purpose of the MTD parser only the read part of the code was taken.

The NAND drivers that can use this parser are sharpsl.c and tmio_nand.c.

Signed-off-by: Andrea Adami 
---
 drivers/mtd/Kconfig   |   8 ++
 drivers/mtd/Makefile  |   2 +
 drivers/mtd/sharpsl_ftl.c | 219 ++
 drivers/mtd/sharpsl_ftl.h |  34 +++
 drivers/mtd/sharpslpart.c | 132 
 5 files changed, 395 insertions(+)
 create mode 100644 drivers/mtd/sharpsl_ftl.c
 create mode 100644 drivers/mtd/sharpsl_ftl.h
 create mode 100644 drivers/mtd/sharpslpart.c

diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index e83a279..5c96127 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -155,6 +155,14 @@ config MTD_BCM47XX_PARTS
  This provides partitions parser for devices based on BCM47xx
  boards.
 
+config MTD_SHARPSL_PARTS
+   tristate "Sharp SL Series NAND flash partition parser"
+   depends on MTD_NAND_SHARPSL || MTD_NAND_TMIO
+   help
+ This provides the read-only FTL logic necessary to read the partition
+ table from the NAND flash of Sharp SL Series (Zaurus) and the MTD
+ partition parser using this code.
+
 comment "User Modules And Translation Layers"
 
 #
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index 99bb9a1..89f707b 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -13,6 +13,8 @@ obj-$(CONFIG_MTD_AFS_PARTS)   += afs.o
 obj-$(CONFIG_MTD_AR7_PARTS)+= ar7part.o
 obj-$(CONFIG_MTD_BCM63XX_PARTS)+= bcm63xxpart.o
 obj-$(CONFIG_MTD_BCM47XX_PARTS)+= bcm47xxpart.o
+obj-$(CONFIG_MTD_SHARPSL_PARTS)+= sharpsl-part.o
+sharpsl-part-objs := sharpsl_ftl.o sharpslpart.o
 
 # 'Users' - code which presents functionality to userspace.
 obj-$(CONFIG_MTD_BLKDEVS)  += mtd_blkdevs.o
diff --git a/drivers/mtd/sharpsl_ftl.c b/drivers/mtd/sharpsl_ftl.c
new file mode 100644
index 000..6b82144
--- /dev/null
+++ b/drivers/mtd/sharpsl_ftl.c
@@ -0,0 +1,219 @@
+/*
+ * MTD method for NAND accessing via logical address (SHARP FTL)
+ *
+ * Copyright (C) 2017 Andrea Adami 
+ *
+ * Based on 2.4 sources: drivers/mtd/nand/sharp_sl_logical.c
+ * Copyright (C) 2002  SHARP
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include "sharpsl_ftl.h"
+
+/* oob structure */
+#define NAND_NOOB_LOGADDR_00   8
+#define NAND_NOOB_LOGADDR_01   9
+#define NAND_NOOB_LOGADDR_10   10
+#define NAND_NOOB_LOGADDR_11   11
+#define NAND_NOOB_LOGADDR_20   12
+#define NAND_NOOB_LOGADDR_21   13
+
+/* Logical Table */
+struct mtd_logical {
+   u32 size;   /* size of the handled partition