Allow TMIO and SDHI driver implementations to provide values for
max_segs and max_blk_count.

A follow-up patch will set these values for Renesas Gen3 SoCs
the using an SDHI driver.
Signed-off-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NAi Kyuse <ai.kyuse.uw@renesas.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Trivial updates to improve checkpatch cleanness.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Update copyrights to reflect work by Wolfram Sang and myself since last
year.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

It is 'R-Car', not 'RCar'. No code or binding changes, only descriptive text.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Make renesas_sdhi_sys_dmac.c a top-level module file that makes use of
library code supplied by renesas_sdhi_core.c

This is in order to facilitate adding other variants of SDHI;
in particular SDHI using different DMA controllers.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
[Arnd: Fixed module build error]
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

Rename the source file SDHI. A follow-up patch will make it a library
file used by a different top-level module file.

The name "renesas" is chosen as the SDHI driver is applicable to a wider
range of SoCs than SH-Mobile it seems to be a more appropriate name.
However, the SDHI driver source itself, is left as sh_mobile_sdhi to
avoid unnecessary churn.

the name "core" was chosen to reflect the desired role of this file,
to provide core functionality to the sdhi driver. A follow-up patch will
move the file into that role.

Internal symbols have also been renamed to reflect the filename change.

The .name member of struct platform_driver and parameter to
MODULE_ALIAS() have not been changed in order to avoid the complication
of potentially breaking SH SoCs which still use platform drivers.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Rename the source file for DMA for SDHI as a follow-up to attaching
DMA code to the SDHI driver rather than the tmio_core driver.

The name "renesas" is chosen as the SDHI driver is applicable to a wider
range of SoCs than SH-Mobile it seems to be a more appropriate name.
However, the SDHI driver source itself, is left as sh_mobile_sdhi to
avoid unnecessary churn.

The name sys_dmac was chosen to reflect the type of DMA used.

Internal symbols have also been renamed to reflect the filename change.

A follow-up patch will re-organise the SDHI driver removing
the need for renesas_sdhi_get_dma_ops().
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Refactor DMA support to allow it to be provided by a set of call-backs
that are provided by a host driver. The motivation is to allow multiple
DMA implementations to be provided and instantiated at run-time.

Instantiate the existing DMA implementation from the sh_mobile_sdhi driver
which appears to match the current use-case. This has the side effect
of moving the DMA code from the tmio_core to the sh_mobile_sdhi driver.

A follow-up patch will change the source file for the SDHI DMA
implementation accordingly. Another follow-up patch will re-organise the
SDHI driver removing the need for tmio_mmc_get_dma_ops().
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Some controllers have 2 clock sources instead of 1. The 2nd clock
is for the internal card detect logic and must be enabled/disabled
along with the main core clock for proper operation.
Signed-off-by: NChris Brandt <chris.brandt@renesas.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>

QUIRK sounds like there is something wrong, but actually there are just
some bits which need to be 1. Rename it to be more clear.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Setup tuning when the board is HS200 enabled.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

The function will only be available if SDR104 was detected in probe,
so no need to check in the function itself again.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

The function will only be available if SDR104 was detected in probe,
so no need to check in the function itself again.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

The capability for HW_RESET is only activated if SDR104 is present, so
no need to check for SDR104 in the function itself again.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Prerequisites for tuning are the same as for hw_reset. We need an SCC
and a supported mode. Populate the tuning related functions only when
those conditions are met. This also removes a tiny race window.
Previously, the functions were populated when the SCC offset was not
initialized which could have led to an OOPS.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

We need a SCC unit for hw_reset. Those units can only be described in
of_data. So, of_data and a valid SCC offset are prerequisites for
enabling the hw_reset capability. Merge the two 'if' conditions into one
and add a check for an scc offset.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

By using the helper of_device_get_match_data(), we can skip some
checking and make the code simpler.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Add tuning support for use with SDR104 mode
This includes adding support for the sampling clock controller (SCC).

Based on work by Ai Kyuse.

Cc: Ai Kyuse <ai.kyuse.uw@renesas.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Acked-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Add support for r7s72100 SoC.
Signed-off-by: NChris Brandt <chris.brandt@renesas.com>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

In moving platforms from board files to DT, there still needs to be a way
to set the ocr_mask setting for the tmio driver during probe. Without this
setting, the probe will fail because the supported voltages are not known.

This patch will also traditional platform registration platforms to
migrate to DT.
Signed-off-by: NChris Brandt <chris.brandt@renesas.com>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Add support for r8a7796 SoC.
Signed-off-by: NAi Kyuse <ai.kyuse.uw@renesas.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Populating card_busy caused a side-effect on a chip variant we don't
have documentation for (r8a73a4). So, enable it and voltage switching
only on devices known to support those features.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Fixes: 452e5eef ("mmc: tmio: Add UHS-I mode support")

card_busy is only used/tested on SDHI for R-Car Gen2 and later.
Move it to the SDHI driver, so we can then activate it conditionally
depending on the SDHI type.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Replace hardcoded values with meaningful names and document what we
know.
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>

Tested on a Salvator-X board with a Spectec SDW-823 WLAN card.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

And return the old clock rate if something went wrong.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

We had a regression on r8a7740 where the SDHI clock was a generic
peripheral clock, so changing its rate was not desired. This should be
fixed in the clock driver. However, it also shows that the new clock
calculation should only be used on tested systems. Add a check for that.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

RCar Gen2 and later implementations of TMIO/SDHI have their own set of
features and additions. FAST_CLK_CHG is just one of them and I see a few
others being added soon. Some may work on older chipsets but this needs
to be tested case by case. Instead of adding a bunch of flags for each
feature, add a global RCar2+ one for now. We can still break out
features if the need arises.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Save a few lines, the codebase is large enough.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This bit has a different meaning in SDHI and original TMIO. Document
that and use the proper naming.
Reviewed-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

There is no support for this platform in the kernel anymore.
Reported-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

A last minute fix applied by Ulf made room for some simplification.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

There is no user left in the kernel, so this code can be removed.
(Legacy, non-DT sh_mobile boards have been removed a while ago.) The

diff looks more complicated than it is: The if-block for multiplexed isr
is now the main code path, the rest is removed.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

We won't access an index based array to get our DT config, but create
separate structs instead. So, remove the array which only wastes memory.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Implement voltage switch, supporting modes up to SDR-50.

Based on work by Shinobu Uehara, Rob Taylor, William Towle and Ian Molton.
Signed-off-by: NBen Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Currently tmio_mmc assumes that the input clock frequency is fixed and
only its own clock divider can be changed.  This is not true in the
case of sh_mobile_sdhi; we can use the clock API to change it.

In tmio_mmc:
- Delegate setting of f_min from tmio to the clk_enable operation (if
  implemented), as it can be smaller than f_max / 512
- Add an optional clk_update operation called from tmio_mmc_set_clock()
  that updates the input clock frequency
- Rename tmio_mmc_clk_update() to tmio_mmc_clk_enable(), to avoid
  confusion with the clk_update operation

In sh_mobile_sdhi:
- Make the setting of f_max conditional; it should be set through the
  max-frequency property in the device tree in future
- Set f_min based on the input clock's minimum frequency
- Implement the clk_update operation, selecting the best input clock
  frequency for the bus frequency that's wanted

sh_mobile_sdhi_clk_update() is loosely based on Kuninori Morimoto's work
in sh_mmcif.
Signed-off-by: NBen Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Change the clk_enable operation to take a pointer to the struct
tmio_mmc_host and have it set f_max.  For consistency, also change the
clk_disable operation to take a pointer to struct tmio_mmc_host.
Signed-off-by: NBen Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Registers are 64bit apart, so we refactor bus_shift handling a little and set
it based on the DT compatible. Also, EXT_ACC is different. It has been tested
on a Salvator-X (Gen3) and, to check for regressions, on a Lager (Gen2).
Signed-off-by: NAi Kyuse <ai.kyuse.uw@renesas.com>
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

We will get a full dump anyhow.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>