Revert "mtd: nand: Kill the chip->scan_bbt() hook" ...

This reverts commit 95ce697.

mtd: nand: Kill the chip->scan_bbt() hook ...

Linux commit e80eba758151 adapted for Barebox:

  None of the existing drivers are overloading the ->scan_bbt()
  method, let's get rid of it and replace calls to ->scan_bbt()
  by nand_create_bbt() ones.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand_bbt: scan for next free bbt block if writing bbt fails ...

Linux commit 10ffd570f117 adapted for Barebox:

  If erasing or writing the BBT fails, we should mark the current BBT
  block as bad and use the BBT descriptor to scan for the next available
  unused block in the BBT. We should only return a failure if there isn't
  any space left.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand_bbt: Move BBT block selection logic out of write_bbt() ...

Linux commit c3baf278d3bf adapted for Barebox:

  This clarifies the write_bbt() function by removing the write label
  and simplifying the error/exit path.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand_bbt: unify/fix error handling in nand_scan_bbt() ...

Linux commit 83c59542d0af adapted for Barebox:

  Don't leak this->bbt, and return early if check_create() fails. It helps
  to have a single error path to avoid these problems.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand_bbt: make nand_scan_bbt() static ...

Linux commit 17799359e7b adapted for Barebox:

  This implementation detail is no longer needed outside of nand_bbt.c.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand_bbt: handle error case for nand_create_badblock_pattern() ...

Linux commit abb9cf78e80a adapted for Barebox.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand_bbt: kill NAND_BBT_SCANALLPAGES ...

Linux commit 5961ad2cb4dd adapted for Barebox:

  Now that the last user of NAND_BBT_SCANALLPAGES has been removed, let's
  kill this peculiar BBT feature flag.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand: remove NAND_BBT_SCANEMPTY ...

Relevant part of Linux commit dad2256269cb:

  NAND_BBT_SCANEMPTY is a strange, badly-supported option with omap as its
  single remaining user.

  NAND_BBT_SCANEMPTY was likely used by accident in omap2[1]. And anyway,
  omap2 doesn't scan the chip for bad blocks (courtesy of
  NAND_SKIP_BBTSCAN), and so its use of this option is irrelevant.

  This patch drops the NAND_BBT_SCANEMPTY option.

  [1] http://lists.infradead.org/pipermail/linux-mtd/2012-July/042902.html

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand: hide in-memory BBT implementation details ...

Linux commit b32843b772db adapted for Barebox:

  nand_base.c shouldn't have to know the implementation details of
  nand_bbt's in-memory BBT. Specifically, nand_base shouldn't perform the
  bit masking and shifting to isolate a BBT entry.

  Instead, just move some of the BBT code into a new nand_markbad_bbt()
  interface. This interface allows external users (i.e., nand_base) to
  mark a single block as bad in the BBT. Then nand_bbt will take care of
  modifying the in-memory BBT and updating the flash-based BBT (if
  applicable).

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand: remove multiplied-by-2 block logic ...

Linux commit b4d20d601f1e adapted for Barebox

  This patch removes any points where the block number is
  doubled/halved/otherwise-shifted, instead representing the block
  number in its most natural form: as the actual block number.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand: don't break long print messages ...

Linux commit 2ac63d901b11 adapted for Barebox:

  ...However, never break user-visible strings such as printk
  messages, because that breaks the ability to grep for them.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand: add accessors, macros for in-memory BBT ...

Linux commit 771c568bcf91:

  There is an abundance of magic numbers and complicated shifting/masking
  logic in the in-memory BBT code which makes the code unnecessary complex
  and hard to read.

  This patch adds macros to represent the 00b, 01b, 10b, and 11b
  memory-BBT magic numbers, as well as two accessor functions for reading
  and marking the memory-BBT bitfield for a given block.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand: bbt: Remove unused variable ...

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: Turn 'bad block at' message into pr_debug ...

As bad blocks get more and more on modern nand flashes this message
starts getting annoying.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand: update to v3.11-rc1 ...

This updates the NAND stuff to Linux-3.11-rc1. It is synchronized
as best as we can get:

- locks removed
- The splitting in different files we had to better support different
  features has been dropped. Instead this is now done mostly with the
  use of __maybe_unused

Some barebox adjustments are forward ported, like:

- Allow partial page writes
- Optionally allow to erase bad blocks
- check for all_ff before writing a page

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: rename MTD_OOB_* to MTD_OPS_* ...

To sync with the Linux kernel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: nand: replace NAND_USE_FLASH_BBT with NAND_BBT_USE_FLASH ...

To sync with the kernel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: Use mtd_* functions where appropriate ...

Instead of dereferencing struct mtd_info members directly use
the wrapper functions which have an additional check if the
callback exists if it is optional, like mark_bad or is_bad.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd nand: Specify pr_fmt and change messages to pr_* ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: scan_write_bbt is only needed with mtd write support ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/mtd: transfer NAND notions to MTD core ...

Change NAND_WRITE into MTD_WRITE.
Change "page_shift" references in the core, which are purely
NAND, into mtd->writesize which is MTD generic.
Rename all "info" (struct mtd_info) into "mtd".

Also provide a parameter to add_mtd_device() so that legacy
nand devices still appear as nand<N>.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nand: Make write support optional ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

move drivers/nand to drivers/mtd/nand ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>