This core driver will be used by a MIPS platform driver
or by an ARM64 PCI driver. The core driver implements the
mmc_host_ops and slot probe & remove functions.
Callbacks are provided to allow platform specific interrupt
enable and bus locking.

The host controller supports:
- up to 4 slots that can contain sd-cards or eMMC chips
- 1, 4 and 8 bit bus width
- SDR and DDR
- transfers up to 52 Mhz (might be less when multiple slots are used)
- DMA read/write
- multi-block read/write (but not stream mode)

Voltage is limited to 3.3v and shared for all slots (vmmc and vmmcq).

A global lock for all MMC devices is required because the host
controller is shared.
Signed-off-by: NJan Glauber <jglauber@cavium.com>
Signed-off-by: NDavid Daney <david.daney@cavium.com>
Signed-off-by: NSteven J. Hill <steven.hill@cavium.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

We have this construction:

if (a && b && !c)
   finalize;
else
   block;
   finalize;

Which is equivalent by boolean logic to:

if (!a || !b || c)
   block;
finalize;

Which is simpler code.
Reviewed-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

mmc_wait_for_data_req_done() is called in exactly one place,
and having it spread out is making things hard to oversee.
Factor this function into mmc_finalize_areq().
Reviewed-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

"previous" is a better name for the variable storing the previous
asynchronous request, better than the opaque name "data" atleast.
We see that we assign the return status to the returned variable
on all code paths, so we might as well just do that immediately
after calling mmc_finalize_areq().
Reviewed-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

In preparation to reuse the code for CQE support.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

In preparation to reuse the code for CQE support.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Factor out data preparation into a separate function mmc_blk_data_prep()
which can be re-used for command queuing.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

mmc_apply_rel_rw() will be used by Software Command Queuing also. In that
case the command argument is not the block address so change
mmc_apply_rel_rw() to get block address from the request.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

RPMB does not allow Command Queue commands. Disable and re-enable the
Command Queue when switching.

Note that the driver only switches partitions when the queue is empty.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NHarjani Ritesh <riteshh@codeaurora.org>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Normal read and write commands may not be used while the command queue is
enabled. Disable the Command Queue when mmc_test is probed and re-enable it
when it is removed.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NHarjani Ritesh <riteshh@codeaurora.org>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Add helper functions to enable or disable the Command Queue.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

eMMC can have multiple internal partitions that are represented as separate
disks / queues. However switching between partitions is only done when the
queue is empty. Consequently the array of mmc requests that are queued can
be shared between partitions saving memory.

Keep a pointer to the mmc request queue on the card, and use that instead
of allocating a new one for each partition.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Change from viewing the requests in progress as 'current' and 'previous',
to viewing them as a queue. The current request is allocated to the first
free slot. The presence of incomplete requests is determined from the
count (mq->qcnt) of entries in the queue. Non-read-write requests (i.e.
discards and flushes) are not added to the queue at all and require no
special handling. Also no special handling is needed for the
MMC_BLK_NEW_REQUEST case.

As well as allowing an arbitrarily sized queue, the queue thread function
is significantly simpler.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

A subsequent patch will remove 'mq->mqrq_cur'. Prepare for that by
assigning it to a local variable.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Allows configuring Samsung S3C24XX MMC/SD/SDIO controller using a device
tree.
Signed-off-by: NSergio Prado <sergio.prado@e-labworks.com>
[Arnd: fix broken conditional expression]
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Set MMC_CAP_AGGRESSIVE_PM for BYT-related Intel SD card
controllers.
Signed-off-by: NAzhar Shaikh <azhar.shaikh@intel.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Set MMC_CAP_AGGRESSIVE_PM for BYT-related Intel SD card
controllers.
Signed-off-by: NAzhar Shaikh <azhar.shaikh@intel.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Factor out setting the response configuration bits thus further reducing
complexity of function meson_mmc_start_cmd.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Factor out setting the block size. This also contributes to reducing
complexity of function meson_mmc_start_cmd.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Use added dev variable for devm_clk_get.
Signed-off-by: NPiotr Sroka <piotrs@cadence.com>
Reviewed-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

DTS properties are used instead of fixed data
because PHY settings can be different for different chips/boards.
Signed-off-by: NPiotr Sroka <piotrs@cadence.com>
Reviewed-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Add polling for ACK to be sure that data are written to PHY register.
Signed-off-by: NPiotr Sroka <piotrs@cadence.com>
Reviewed-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This fixes a NULL pointer dereference in case of a MMC request with a
set block count command and no data.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Tested-by: NPeter Robinson <pbrobinson@gmail.com>
Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Use new core function mmc_get_dma_dir().
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

CMD23 mode (use "set block count" command before transferring multiple
data blocks) typically is more performant as host / card know upfront
how many data blocks to expect. Therefore add support for this mode to
the driver.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Currently we use a fixed timeout of 4s for all data transfers. Switch
to dynamic timeout values by making use of data->timeout_ns.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

So far the driver name is used as interrupt description, therefore in
/proc/interrupts it's not possible to tell which interrupt belongs to
which port. Change this by switching to NULL what causes the default
(device name) to be used. In our case that's the DT node name.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Use GENMASK consistently for all bit masks and switch to using the
bitfield macros FIELD_GET and FIELD_PREP. This hides parts of the
complexity of dealing with bit fields.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Currently the get_timeout_clock callback doesn't clearly
have a statement that it needs the variant drivers to return
the timeout clock rate in kHz if the SDHCI_TIMEOUT_CLK_UNIT
isn't present, otherwise the variant drivers should return it
in MHz. It's also very likely that further variant drivers which
are going to use this callback will be confused by this situation.
Given the fact that moderm sdhci variant hosts are very prone to get
the timeout clock from common clock framework (actually the only three
users did that), it's more natural to return the value in Hz and we
make an explicit comment there. Then we put the unit conversion inside
the sdhci core. Thus will improve the code and prevent further misuses.
Reported-by: NAnssi Hannula <anssi.hannula@bitwise.fi>
Signed-off-by: NShawn Lin <shawn.lin@rock-chips.com>
Acked-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

The controller's errors are usually normal (for example, for MMC or SDIO
cards, some errors are expected to happen; and for boards without a
dedicated card detect pin the error info will even flood console and
hide other normal messages) and hard to understand.

Change their print level to debug, thus it won't be shown to generic
users.
Signed-off-by: NIcenowy Zheng <icenowy@aosc.xyz>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

We don't need variable cmd_cfg_timeout, so remove it and simplify the
code a little.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>

Centralize setting data->bytes_xfered in one place and make sure
that the number of transfererd bytes is set only if we receive
the end-of-chain interrupt and there was no error.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>

Response reading can be slightly improved by doing it in just one place.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>

Simplify the code by using two variables instead of a struct sd_emmc_desc.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>

Replace cmd->data with a local variable to simplify code a little.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>

The variables holding the configuration bits are zero-initialized.
So we can remove all bit resets.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>

If we don't select a set of better parameters for our emmc host,
It may easily occur CMD response CRC error. And also it may cause
cannot boot up issue.

Fot getting a set of better parameters, our emmc host supports
data tune mechanism.Therefore, our emmc driver also should change
to use data tune for CMD line.

Because our emmc host use the different clock source to sample the
CMD signal between HS200 and HS400 mode, the parameters are also
different between these two modes.
Separate cmd internal delay for HS200/HS400 mode.

This change can fix "System can not boot up" issue.
Signed-off-by: NYong Mao <yong.mao@mediatek.com>
Signed-off-by: NChaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Improve mmc_io_rw_extended a little:
- using DIV_ROUND_UP achieves the same but is better readable
- simplify code by using sg_set_buf
- simplify one statement by using -= operator
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Current code gets number of taps only once and keeps the value. This is
not correct, we need to obtain it every time before executing tuning,
so remove the outer if-block.
Signed-off-by: NMasaharu Hayakawa <masaharu.hayakawa.ry@renesas.com>
[wsa: extracted from a larger patch and reworded commit message]
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

In the (maybe academical) case, we don't get a DATAEND interrupt after
DMA completed, we will wait endlessly for the completion to complete.
This is not bad per se, since we have a more generic completion tracking
a timeout. In that rare case, however, the DMA buffer will not get
unmapped and we have a leak. Reorder the code, so unmapping will always
take place.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>