drop CONFIG_PARTITION_NEED_MTD ...

With CONFIG_PARTITION_NEED_MTD enabled we use mtd rather than devfs
directly to create partitions on mtd devices. Since:

| commit b32cd8d
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Wed Apr 9 15:49:32 2014 +0200
|
|     mtd: nand: bb: use mtd api directly
|
|     The devfs layer just adds an addition indirection between mtd
|     and the bb devices with no purpose. Drop it.
|
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

The bad block aware device creation doesn't work if this option
is disabled. With this we remove CONFIG_PARTITION_NEED_MTD and always
use mtd partitions on mtd devices.

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

devfs-core: return new cdev also for mtd partitions ...

__devfs_add_partition returns the newly created cdev, but in case
of mtd partitions it accidently returns 0. Fix this.

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

Merge branch 'for-next/partitionhelper' ...

Conflicts:
	fs/devfs-core.c

devfs: partitioning: add new helper devfs_create_partitions ...

Compared to devfs_add_partition which adds a single partition
devfs_create_partitions creates several partitions at once. One nice
benefit is that this simplifies appending partitions because the start
of the latter partition doesn't need to be specified explicitly.
Also dev_add_bb_dev() is called by the new helper if the bbname is
specified for a partition.

Note that adding partitions is also more flexible now (also via
devfs_add_partition) because negative values for offset and size now
have a proper meaning instead of creating broken partitions.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

devfs_add_partition: make flags parameter unsigned ...

The value is only used to assign to a (*struct cdev)->flags which is an
unsigned int and it is passed as fourth parameter of mtd_add_partition which
is an unsigned long.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

devfs: partitioning: add missing free in error path ...

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: register mtd partitions as real mtd devices ...

So far mtd partitions were mtd devices, but these were not registered.
This patch changes this. mtd partitions are now registered like real
mtd devices. This makes them part of the device hierarchy.

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

mtd: Add subpagesize to mtd_info_user ...

ubiformat needs the subpagesize to work correctly. The kernel uses
sysfs to pass the subpagesize, but in barebox we have the possibility
to extend struct mtd_info_user. Add a corresponding field and use it
in ubiformat.

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

cdev: add device_find_partition ...

device_find_partition allows to find a partition of a device with
a particular name.

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

cdev: allow to open a struct cdev ...

cdev_open() opens a cdev by name. This introduces cdev_do_open which
allows to open a cdev when the cdev is already found by other means.

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

cdev: introduce partition names ...

currently most partition cdevs have the name <devname>.<partname>
This makes it hard to find a partition by <partname>. This introduces
a partname field in struct cdev so that.

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

devfs: let devfs_add_partition return the new partition ...

Useful for unregistering later or for adding addional flags.

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

devfs & mtd: add MEMERASE ioctl support ...

To make that, we need to shift mtd_erase before mtd_ioctl.
ubi-utils need that, especially ubiformat.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

devfs-core: add writesize in mtd partition ioctl ...

Add writesize in mtd partition MEMGETINFO ioctl.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

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

partitions: Make 64bit capable ...

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

make cdev 64bit capable ...

Next step to 64bit support: Make cdev size a 64bit type.

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

mtd: fix arguments to bad block ioctls ...

In the Kernel the mtd ioctls expect a pointer to the offset, whereas
barebox interprets the pointer itself as an offset. Since we want
to add 64bit support for file sizes a pointer may not be sufficient,
so align with the kernel and convert it to a pointer to the offset.

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

complete: add delpart complete support ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

devfs-code: fix warning ...

/opt/work/barebox/fs/devfs-core.c: In function 'partition_ioctl':
/opt/work/barebox/fs/devfs-core.c27: warning: unused variable 'reg'

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ioctl: add support for ECCGETSTATS and MEMGETREGIONINFO ...

Support added for ioctl of ECCGETSTATS and MEMGETREGIONINFO.

Fix default handling in core.c to return -EINVAL, if request
was unknown.

Signed-off-by: Alexander Aring <a.aring@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

cdev: pass flags to open function ...

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

Create a unique cdev number for on demand devices ...

For disk like devices attached to MCI, ATA or USB it depends on the order they
will be recognized. So an unique number for all disk like devices is required.

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

devfs: factor out core devfs functionality ...

This makes it possible to compile without devfs. devfs_create/devfs_remove
is used by drivers and thus must still be present even without devfs support.
Also, this patch adds cdev_open/cdev_close/cdev_flush/cdev_ioctl calls to
work with devices without using the file api.

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