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: allow skipping SD card initialization ...

This patch allows to skip SD card initialization for eMMCs by setting
the "no-sd" property in the host controller device tree node. Avoiding
two SD command timeouts speeds up detection time by well over 200 ms.

Signed-off-by: Philipp Zabel <p.zabel@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: add eMMC v5 and V5.1 detection support ...

Just add the defines.

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

mmc: Consistently use EXT_CSD_* names from eMMC 5.1 spec ...

We have kept the EXT_CSD registers which were added in the 5.1 spec
separately for no good reason. Order the EXT_CSD defines by register
number instead. Also we had some duplicates, for these consistently
use the names from the 5.1 spec.

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

mci: Allow parsing for explicit DT node ...

Convert mci_of_parse into mci_of_parse_node, a function that takes
explicit deivce tree node pointer to be used for SD/MMC related
properties extraction. Implement original mci_of_parse as a wrapper
around the call to new function.

This is useful for controllers who specify parameter like bus witdth and
GPIOs as a part of main controller's child nodes (e.g. AT91 SoCs).

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: Allow to partition eMMC boot partitions ...

So far the eMMC boot partitions cannot be partitioned from the
device tree. Since they are often 4MiB in size they are big enough
to hold a barebox image and the environment. Add partition parsing
to the boot partitions to allow this usecase.

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

mci: Fix version numbers again ...

The SD and eMMC version numbers are a pain to print and sort, since
they are inconsistent in if a two digit minor version shdoulde be
treated as a single number or as minor and micro version numbers.

This allows version 1.10 and 4.5 and 4.41, where 41 is less than 5.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mci: core: bus-width property should override driver default ...

The OF code for parsing bus-width would only add the specified width
to those the driver might have already set capability flags for.

Because of this, if the driver had set 8 or 4 bit width, it wasn't
possible for the DT to specify that fewer pins were used on the board
and a smaller width was necessary.

Change this so the width in the DT overrides whatever widths the
driver says it supports.  There is no reason to have an incorrect
device tree and it makes far more sense for the DT to override the
driver default than for the driver default to override the DT.

The widths the driver puts in host_caps before calling mci_of_parse()
are considered the default if the DT doesn't specify bus-width.  This
should cause the least amount of change to existing boards, as despite
a comment that no bus-width meant to use 1 bit, using the driver
default is what was really happening.

Unfortunately, half of existing drivers default to the largest width
they support while the other half default to the smallest.  Boards
should just stick the width in the device tree.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers: mci: Add mci_get_device_by_name function ...

Get a 'struct mci' by search after the device name.

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

include: mci: Add new ext. CSD field defines ...

Added missing defines for the extended CSD register until standard 5.1.

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

drivers: mci: Make two functions public ...

There is no possibility to read/write to the extended CSD register of
MMC devices from a command. To avoid duplicated driver code, two driver
functions have to be public.

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

mci: implement non-removable property ...

There is no need to check the card-detect status
for non-removable devices.

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

mci: Add regulator support ...

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

mci: Fix version handling ...

Currently the version defines reflect the digits in the version
number. MMC_VERSION_4_41 is defined as 0x441 and MMC_VERSION_4_5
is defined as 0x405. This results in MMC_VERSION_4_5 < MMC_VERSION_4_41
becoming true which was surely not intended. Fix this by
redefining the versions as 0x<major><minor><micro>. This makes the
string generation more complicated but makes versions comparable
again.

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

mci: add DSR support ...

The eMMC and the SD-Card specifications describe the optional SET_DSR command.
During measurements at our lab we found that some cards implementing this feature
having really strong driver strengts per default. This can lead to voltage peaks
above the specification of the host on signal edges for data sent from a card to
the host.

Since availability of a given card type may be shorter than the time a certain
hardware will be produced it is useful to have support for this command (Alternative
would be changing termination resistors and adapting the driver strength of the
host to the used card.)

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

mci: Support the correct version for eMMC ...

eMMC is available up to version 4.5 but the
correct version is not decoded. Change version
definitions to support more minor verions, add
missing versions and parse the minor versions from
ext_csd.

After this, card detection code and devinfo reports
correct versions.

Handling is inspired by u-boot code.

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

mci: mxs: support overwriting the device name via platform data ...

The current implementation of the bootloader specification depends on the
hardware name and the name of the device in /dev to match. As the default
hardware name is mciX and the device name is diskY the bootloader spec
cannot be used as is.

This patch implements a way to overwrite the device name similar to what is
possible for the imx-esdhc driver.

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

mci: add max_req_size support ...

Some controller such as the ARM AMBA pl181 can not handle more than 16bits
data length request.

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

mci: Use tran_speed field to fix highspeed MMC card clock ...

The tran_speed field as decoded from csd is valid in most cases,
so use it to determine the maximum clock we can support. It is
not valid though for MMC highspeed cards, in this case the
csd contains invalid values and we have to set tran_speed explicitly
to the maximum speed. As the values passed into mci_set_clock are
now based on tran_speed we no longer have to limit the rate to
tran_speed in mci_set_clock.

The (intended) effect of this patch is that highspeed MMC cards are
no longer limited to non highspeed rates.

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

mci: provide static inline function for mmc_host_is_spi ...

To prevent compiler warnings like:

warning: unused variable 'host'

When CONFIG_MCI_SPI is disabled.

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

mci: rename capabilities flags ...

Use MMC_CAP_ names instead of MMC_MODE_. This makes it more
clear that these are capabilities of host/card and do not refer
to the current mode. These are in line with the Linux Kernel
except for MMC_CAP_MMC_HIGHSPEED_52MHZ which could be fixed
later.

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

mci: Add devicetree helper function ...

This adds helper code to parse the bus-width and max-frequency
property from devicetree.

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

mci: implement detect driver callback ...

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

mci: embed mci device into struct mci ...

To safe a separate allocation and to make the code simpler.

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

mci: Add support for MMC boot partitions ...

Some MMC cards support boot partitions. These are special regions
on the MMC card intended to put a bootloader on.

This patch adds support for these partitions, they are accessible
as /dev/diskx.boot[0|1].

Additionally the partitions can be configured bootable using a
device parameter. This can be used to mark the user area or one
of the boot partitions as bootable.

Since this feature is mostly seen on eMMC cards it is made optional
to lower the size impact for boards which do not have eMMC.

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

mci: Use dev_add_param_int for probe parameter ...

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

mci: add card_write_protected ...

Currently there is no common way for the mci host driver to tell
that thee car is write protected. This adds a card_write_protected callback
which is used by the framework to tell whether it's protected or not.

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

mci: Add card_present callback ...

Currently there is no common way for the mci host driver to tell
that there is no card present. This adds a card_present callback
which is used by the framework to tell whether it's present or not.

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

mci: Allow to specify device name ...

When multiple MMC/SD cards are present in the system we often
have to have persistent names to identify them during runtime.
This patch allows to overwrite the devicename which is used.

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