commands/*: Replace license and copyright boilerplate by SPDX identfiers ...

While at it also drop references to the non-existing CREDITS file and do
some small rearrangements for some uniform formatting.
(SPDX-License-Identifier first, then copyright texts and then an empty
line.)

The advantage is that these specifiers are machine-parseable which helps
license conformance.

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

mci: provide wrapper for mci_get_device_by_name ∘ devpath_to_name ...

Also convert the only user of mci_get_device_by_name to this new
wrapper.

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

commands: mmc_extcsd: describe missing bit ...

The EXT_CSD_EXCEPTION_EVENTS_STATUS array entry is wrongly duplicated.
Replace the index by the correct field at byte offset 58[1].

[1]: See http://webshop.atlantiksysteme.de/temp/FLEXXONeMMC4.5pSLCSPECV1.2.pdf

Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: mmc_extcsd: fix extcsd value meanings ...

As specified by the JEDEC Standard No. 84-A441 the RESET_BOOT_BUS_WIDTH
(Bit[2]) is specified the other way around. Also the BOOT_MODE is a two
bit register.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: mmc_extcsd: Make use of devpath_to_name() ...

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mmc_extcsd command: Add cmd option to set bkops-enable ...

This patch is for convenience to set bkops-enable (EXT_CSD_BKOPS_EN[163])
on devices which have it not yet activated.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: mmc_extcsd: Add support to write multibyte registers ...

It has been possible to write only the first byte of a multibyte register.
Updated the command to write the complete value of a multibyte register at once.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Reviewed-by: Bastian Stender <bst@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: drop unused parameter from mci_switch() ...

The SWITCH command has two purposes:
 a) switch the command set
 b) Write to the EXT_CSD register

If the access field (bits [25:24]) in the argument are b00, we're in
case a), otherwise in b). As mci_switch() always passes
MMC_SWITCH_MODE_WRITE_BYTE (0b3) in the access field, only case b) is
relevant here. According to the eMMC specification[1] the command set
field is ignored in case b) and so the respective parameter (that is
unused already now) can be dropped.

[1] Embedded Multi-Media Card (e•MMC) Electrical Standard (5.1),
    February 2015; paragraph 6.6.1

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

mmc_extcsd command: rework ...

This patch is a rework of the mmc_extcsd command:

- Always print registers. Previously we never printed registers that
  were already present in an older version of the spec
- Put register names, access type and width into an array indexed by the
  register number
- Print multibyte registers only once with the resulting value, and not
  bytewise.

There's still more to cleanup, like for example we want to write
multibyte registers once with the complete value, not bytewise. Anyway,
this is a start.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

mmc_extcsd command: Fix multiline prints ...

The multiline prints lack the indention at the beginning of the second
line. Add these.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

commands/mmc_extcsd: Relicense under GPLv2+ ...

GPLv3 is incompatible with the projects license. Relicense file
under GPLv2+

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Daniel Schultz <d.schultz@phytec.de>

commands: mmc_extcsd: Fix incorrect usage of sprintf ...

In a number of places print_field_ge_v7() and print_field() function
would call sprintf() without providing is with appropriate output
buffer (str is initialized to NULL). Replace the sprintf() with
basprintf() to fix that.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

stdio: rename getc to getchar ...

The function we have implemented as getc has the semantics of the
standard function getchar, so rename it accorgingly.

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

commands: Add MMC ext. CSD register tool ...

This tools can read/write to the extended CSD register of MMC devices.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>