This patch adds support for the SD/MMC host controller found
on Wondermedia 8xxx series SoCs, currently supported under
arm/arch-vt8500.

A binding document is also included, based on mmc.txt with
additional properties.
Signed-off-by: NTony Prisk <linux@prisktech.co.nz>
Signed-off-by: NChris Ball <cjb@laptop.org>

RPMB partition is accessing though /dev/block/mmcXrpmb device
User callers can read and write entire data frame(s) as defined
by JEDEC Standard JESD84-A441, using standard IOCTL interface.
Signed-off-by: NAlex Macro <alex.macro@stericsson.com>
Signed-off-by: NLoic Pallardy <loic.pallardy@stericsson.com>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NKrishna Konda <kkonda@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Provide support for automatically sending Set Block Count
(CMD23) messages. Used at least for RPMB support.
Signed-off-by: NAlex Macro <alex.macro@stericsson.com>
Signed-off-by: NLoic Pallardy <loic.pallardy@stericsson.com>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NJohan Rudholm <johan.rudholm@stericsson.com>
Acked-by: NKrishna Konda <kkonda@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Extend current sysfs access to ext_csd rpmb parameters (RPMB partition
size) and rel_sector information.
Signed-off-by: NLoic Pallardy <loic.pallardy@stericsson.com>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NJohan Rudholm <johan.rudholm@stericsson.com>
Acked-by: NKrishna Konda <kkonda@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Do not scan rpmb partitions for "soft" partitions, since the rpmb
partition contains protected data. Silences the following message
during boot:

 mmcblkXRPMB: unknown partition table
Signed-off-by: NJohan Rudholm <johan.rudholm@stericsson.com>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NKrishna Konda <kkonda@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Following JEDEC standard, if the mmc supports RPMB partition,
a new interface is created and exposed via /dev/block.
Users will be able to access RPMB partition using standard
mmc IOCTL commands.
Signed-off-by: NAlex Macro <alex.macro@stericsson.com>
Signed-off-by: NLoic Pallardy <loic.pallardy@stericsson.com>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NJohan Rudholm <johan.rudholm@stericsson.com>
Acked-by: NKrishna Konda <kkonda@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Both of MMC_TIMING_LEGACY and MMC_TIMING_UHS_SDR12 are defined
to 0. And ios->timing is set to MMC_TIMING_LEGACY during power up.
But set_ios can't distinguish these two timing if host support
spec 3.0. Just adjust timing values to be different can resolve
this issue without any other impact.
Reviewed-by: NGirish K S <girish.shivananjappa@linaro.org>
Acked-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NKevin Liu <kliu5@marvell.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Enable the quirk SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN since
SD_CAPABILITIES_1[15:8](BASE_FREQ) can't get correct base clock value.
It returns a fixed pre-set value like 200 on some sdhci-pxav3 based
platforms like MMP3 while return 0 on the other sdhci-pxav3 based
platforms.  So we enable the quirk and get the base clock via function
get_max_clock. Also add get_max_clock.
Reported-by: NPhilip Rakity <prakity@marvell.com>
Reviewed-by: NPhilip Rakity <prakity@Marvell.com>
Acked-by: NZhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: NKevin Liu <kliu5@marvell.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

There are discrepancies with regards to how MMC capabilities
are carried throughout the subsystem. Let's standardise them
to eliminate any confusion.
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

All MXS users have been converted to device tree and the board files have
been removed.

No need to keep platform data in the driver.

Also move bus_width declaration in the beggining of mxs_mmc_probe() to
avoid: 'warning: ISO C90 forbids mixed declarations and code'.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Acked-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

Before this patch, we always used only single sg entry for SDIO transfer.
This patch switches to using multiple sg entries. In the case of dwmci,
it supports only up to 4KB size per single sg entry. So if we want to
transfer more than 4KB, we should send more than 1 command.

When we tested before applying this patch, it took around 335 us for
5K(5120) bytes transfer with dwmci controller. After applying this patch,
it takes 242 us for 5K bytes. So this patch makes around 38% performance
improvement for 5K bytes transfer. If the transfer size is bigger, then
the performance improvement ratio will be increased.
Signed-off-by: NKyoungil Kim <ki0351.kim@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

There are infinite loops in the mmc code that can be caused by bad
hardware.  The code will loop forever if the device never comes back
from program mode, R1_STATE_PRG, and it is not ready for data,
R1_READY_FOR_DATA.

A long timeout is added to prevent the code from looping forever.
The timeout will occur if the device never comes back from program
state or the device never becomes ready for data.

It's not clear whether the timeout will do more than log a pr_err()
and then start a fresh hang all over again.  We may need to extend
this patch later to perform some kind of reset of the device (is
that possible?) or rejection of new I/O to the device.
Signed-off-by: NTrey Ramsay <tramsay@linux.vnet.ibm.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

The patch "dw_mmc: fix multiple drv_data NULL dereferences" has
unfortunately clashed with my "mmc: dw_mmc: constify dw_mci_idmac_ops
in exynos back-end" patch, causing new warnings to appear.

This should hopefully fix the issue for good.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

The at91-mci driver is not needed anymore since the atmel-mci driver now
supports all Atmel devices.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

MMC debounce clock is applicable only for omap2430, warning message gets
printed when enable fails for debounce clock. Remove the get debounce clock
failure message as it is noisy for other platforms.
Signed-off-by: NBalaji T K <balajitk@ti.com>
Reported-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Acked-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Maximum bus frequency can be limited by external circuitry like level
shifters etc. Allow passing this value from DT.
Signed-off-by: NDaniel Mack <zonque@gmail.com>
Signed-off-by: NVenkatraman S <svenkatr@ti.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

This allows DT-driven board to set up the pin mux only when the driver
is in use.
Signed-off-by: NDaniel Mack <zonque@gmail.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NVenkatraman S <svenkatr@ti.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

When a SD card is initialized some data transfers of 64 and 8 bytes
are issued. It seems the DMA has some problems dealing with these kind
of "short" transfers, leading sometimes to the SD card not being detected.

In order to solve this problem, do not use DMA for transfer sizes lower
than the sector size.
Signed-off-by: NJavier Martin <javier.martin@vista-silicon.com>
Acked-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

Since v3.2 we have nice macro to define the platform driver's init and exit
calls. This patch simplifies the dw_mmc platform driver by using that macro.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NGirish K S <girish.shivanajappa@linaro.org>
Acked-by: NWill Newton <will.newton@imgtec.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NGirish K S <girish.shivananjappa@linaro.org>
Acked-by: NWill Newton <will.newton@imgtec.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

In case both 'req' and 'mq->mqrq_prev->req' are null, there is no request
to be processed. That means there is no need to switch buffer.
Switching buffer is required only after finishing 'issue_fn'.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: NPer Forlin <per.forlin@stericsson.com>
Tested-by: NJohan Rudholm <johan.rudholm@stericsson.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Signed-off-by: NJohan Rudholm <johan.rudholm@stericsson.com>
Reviewed-by: NPhilip Rakity <prakity@nvidia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

The vmmc regulator enable in sdhci_add_host is NOT necessary since
it can be enabled during mmc_power_up by function mmc_regulator_set_ocr.
And this extra enable will make regulator_enable/regulator_disable
unbalanced. Consequently, vmmc can't be disabled during mmc_power_off.

Also, if the vqmmc regulator exists, it should be enabled regardless it
support 1.8v or not.
Signed-off-by: NKevin Liu <kliu5@marvell.com>
Signed-off-by: NPhilip Rakity <prakity@marvell.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

On some systems, e.g., kzm9g, MMCIF interfaces can produce spurious
interrupts without any active request. To prevent the Oops, that results
in such cases, don't dereference the mmc request pointer until we make
sure, that we are indeed processing such a request.
Reported-by: NTetsuyuki Kobayashi <koba@kmckk.co.jp>
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Tested-by: NTetsuyuki Kobayashi <koba@kmckk.co.jp>
Cc: stable@vger.kernel.org
Signed-off-by: NChris Ball <cjb@laptop.org>

This reverts commit 8464dd52, which was a misapplied debugging
version of the patch, not the final patch itself.
Signed-off-by: NChris Ball <cjb@laptop.org>
Cc: stable@vger.kernel.org

2abeb5c5 ("Add clk_(enable/disable) in runtime suspend/resume")
added the capability to stop the clocks when the device is runtime
suspended, but forgot to handle the case of the card-detect using
an external gpio.

Therefore in the case that runtime-pm is enabled, start the io-clock
when a card is inserted and stop it again once it is removed.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

If host clock is disabled, host cannot detect a card in case of using
CD internal for detection.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Convert clk_enable/clk_disable to clk_prepare_enable/clk_disable_unprepare
calls as required by common clock framework.
Signed-off-by: NThomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

The of_device_id match data is now marked as const and
must not be modified. This changes the dw_mmc to mark
all pointers passing the dw_mci_drv_data or dw_mci_dma_ops
structures as const, and also marks the static definitions
as const.

drivers/mmc/host/dw_mmc-exynos.c: In function 'dw_mci_exynos_probe':
drivers/mmc/host/dw_mmc-exynos.c:234:11: warning: assignment discards 'const' qualifier from pointer target type [enabled by default]
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Thomas Abraham <thomas.abraham@linaro.org>
Cc: Will Newton <will.newton@imgtec.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

The MODULE_DEVICE_TABLE entry for dw_mci_exynos_match
was incorrectly copied from the platform back-end, which
causes this error when building the driver as a loadable
module:

drivers/mmc/host/dw_mmc-exynos.c: At top level:
drivers/mmc/host/dw_mmc-exynos.c:226:34: error: '__mod_of_device_table' aliased to undefined symbol 'dw_mci_pltfm_match'

This patch fixes the problem by just using the correct
string.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Thomas Abraham <thomas.abraham@linaro.org>
Cc: Will Newton <will.newton@imgtec.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Commit 473b095a ("mmc: sdhci: fix incorrect command used in tuning")
introduced a NULL dereference at resume-time if an SD 3.0 host controller
raises the SDHCI_NEEDS_TUNING flag while no card is inserted.  Seen on an
OLPC XO-4 with sdhci-pxav3, but presumably affects other controllers too.
Signed-off-by: NChris Ball <cjb@laptop.org>
Cc: stable <stable@vger.kernel.org> [3.3+]

There are two problems here:

The check for vmmc was printing an unnecessary pr_info() when
host->vmmc is NULL.

The intent of the check for vqmmc was to only remove UHS if we have a
regulator that doesn't support the required voltage, but since IS_ERR()
doesn't catch NULL, we were actually removing UHS modes if vqmmc isn't
present at all -- since it isn't present for most users, this breaks
UHS for them.  This patch fixes that UHS regression in 3.7-rc1.
Signed-off-by: NKevin Liu <kliu5@marvell.com>
Signed-off-by: NBin Wang <binw@marvell.com>
Reviewed-by: NPhilip Rakity <prakity@marvell.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

1. Never ever publish a device in the system before it has been setup
   to a usable state.
2. Unregister the device _BEFORE_ taking away any resources it may be
   using.
3. Don't check clks against NULL.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Tested-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

A recent commit "mmc: sh_mmcif: fix clock management" has introduced a
use after free bug in sh_mmcif.c: in sh_mmcif_remove() the call to
mmc_free_host() frees private driver data, therefore using it afterwards
is a bug. Revert that hunk.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: stable@vger.kernel.org [3.6]
Signed-off-by: NChris Ball <cjb@laptop.org>

The SDHCI standard defines a 256 byte register set but a device
that specifies a larger iomem region is not an error.  Alter the
message condition accordingly.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

The correct name for the driver is "mxc-mmc".
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

dev->platform_data is NULL in case of device tree boot,
instead use the saved version in struct omap_hsmmc_host.
Signed-off-by: NBalaji T K <balajitk@ti.com>
Signed-off-by: NVenkatraman S <svenkatr@ti.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

struct omap_hsmmc_host *host should not be accessed after mmc_free_host().
Reorder mmc_free_host() after iounmap(host->base).
Signed-off-by: NBalaji T K <balajitk@ti.com>
Signed-off-by: NVenkatraman S <svenkatr@ti.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

800d78bf ("mmc: dw_mmc: add support for implementation specific
callbacks") -- merged in v3.7-rc1 -- introduced multiple NULL pointer
dereferences when the default dw_mci_pltfm_probe() is used, as it sets
host->drv_data to NULL, and that's only checked against NULL in 1 out of
the 7 cases where it is dereferenced.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Acked-by: NJaehoon Chung <jh80.chung@samsung.com>
Acked-by: NWill Newton <will.newton@imgtec.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

As mmc_start_host is getting called before enabling the dw_mmc controller
interrupt, there is a problem of missing the SDMMC_INT_CMD_DONE for the
very first command sent by the sdio_reset.

This problem occurs only when we disable MMC debugging i.e, MMC_DEBUG=n.
This patch enables the dw_mmc controller interrupt before mmc_start_host.
Signed-off-by: NYuvaraj CD <yuvaraj.cd@samsung.com>
Reviewed-by: NGirish K S <girish.shivananjappa@linaro.org>
Acked-by: NWill Newton <will.newton@imgtec.com>
Signed-off-by: NChris Ball <cjb@laptop.org>