Adding card detect callback function and card detect configuration
function for MMC1 Controller on OMAP4.

Card detect configuration function does initial configuration of the
MMC Control & PullUp-PullDown registers of Phoenix.

For MMC1 Controller, card detect interrupt source is
twl6030 which is non-gpio. The card detect call back function provides
card present/absent status by reading MMC Control register present
on twl6030.

Since OMAP4 doesn't use any GPIO line as used in OMAP3 for card detect,
the suspend/resume initialization which was done in omap_hsmmc_gpio_init
previously is moved to the probe thus making it generic for both OMAP3 &
OMAP4.

Cc: Tony Lindgren <tony@atomide.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Madhusudhan Chikkature <madhu.cr@ti.com>
Cc: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: NKishore Kadiyala <kishore.kadiyala@ti.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Adjust the tmio_mmc block size check to accept 2-byte requests in 4-bit
mode if the hardware supports it.

Tested with the SDHI hardware block included in sh7724.
Signed-off-by: NYusuke Goda <yusuke.goda.sx@renesas.com>
Signed-off-by: NMatt Fleming <matt@console-pimps.org>
Acked-by: NMagnus Damm <damm@opensource.se>
Tested-by: NArnd Hannemann <arnd@arndnet.de>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

In some platforms (e.g. AP4EVB) the card detect pin of a slot is not
directly connected to the sh_mmcif controller, so that polling needs
to be used. To overcome the overhead induced by querying the controller
on each poll cycle, card detection can be handled in the platform code
more efficiently.
This patch exposes a get_cd hook for that purpose.
Signed-off-by: NArnd Hannemann <arnd@arndnet.de>
Tested-by: NYusuke Goda <yusuke.goda.sx@renesas.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Some controllers, supported by the tmio_mmc driver do not have the card
detect pin of a slot connected, so that polling needs to be used and
card detection is handled by other means.
This patch exposes a get_cd hook for that purpose.
Signed-off-by: NArnd Hannemann <arnd@arndnet.de>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

This adds the support of atmel-mci sd/mmc driver in at91sam9g45 devices and
board files. This also configures the DMA controller slave interface for
at_hdmac dmaengine driver.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

Support Marvell PXA168/PXA910/MMP2 SD Host Controller.
Signed-off-by: NZhangfei Gao <zhangfei.gao@marvell.com>
Acked-by: NHaojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

The old limit of number of minor numbers per mmcblk device was hardcoded
at 8.  This isn't enough for some of the more elaborate partitioning
schemes, for example those used by Chrome OS.

Since there might be a bunch of systems out there with static /dev
contents that relies on the old numbering scheme, let's make it a
build-time option with the default set to the previous 8.

Also provide a boot/modprobe-time parameter to override the config
default: mmcblk.perdev_minors.
Signed-off-by: NOlof Johansson <olof@lixom.net>
Cc: Mandeep Baines <msb@chromium.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

The SPI bus is not reliable for large data transfers on all platforms.
The current mmc_spi driver fails SD read/write commands immediately if
occasional CRC errors are reported by the SD device.  This patch makes
the operation recover from CRC errors by repeating the last SD command.
The retry count is set to 5 to ensure the driver passes stress tests.
Signed-off-by: NSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

This driver adds basic support for the esdhc-core found on e.g.
imx35/51, as a platform driver.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NAnton Vorontsov <cbouatmailru@gmail.com>
Tested-by: NEric Bénard <eric@eukrea.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Put everything which can be shared between the OF and platform version
of this driver into a local .h file.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Tested-by: NEric Bénard <eric@eukrea.com>
[cjb: fix compile error: sdhci-esdhc.c->sdhci-esdhc.h]
Signed-off-by: NChris Ball <cjb@laptop.org>

The custom init call may need more data to perform its job, so we pass
it a pointer to pdata, too. Also, always use the platform_id specific
data even if platform_data is present. Doing that, platform_data can
additionally be parsed by init() for board-specific information (via
sdhci->mmc->parent).

(Note: the old behaviour was that you could override the platform_id
specific data with your own. However, one can still do this by using the
"sdhci" id instead of "sdhci-<something>".)
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Tested-by: NEric Bénard <eric@eukrea.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Some controllers handle their write-protection differently. Introduce a
callback to be able to handle it, ensuring the same locking takes place
for it. Rename the status variable to make it more obvious why the read
from the registers needs to be inverted.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Tested-by: NEric Bénard <eric@eukrea.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Make use of the include/linux/mmc directory.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NAnton Vorontsov <cbouatmailru@gmail.com>
Tested-by: NEric Bénard <eric@eukrea.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

We need to carry some information per host, e.g. the clock. Add a
structure for it and initialize it in the generic part. Also improve
the check for a parent.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Cc: Richard Röjfors <richard.rojfors.ext@mocean-labs.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Fix kconfig dependency warning to satisfy dependencies:

  warning: (MMC_CB710 && MMC && PCI) selects CB710_CORE which has
  unmet direct dependencies (MISC_DEVICES && PCI)
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Acked-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: NChris Ball <cjb@laptop.org>

Signed-off-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: NChris Ball <cjb@laptop.org>

Signed-off-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: NChris Ball <cjb@laptop.org>

Signed-off-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: NChris Ball <cjb@laptop.org>

Signed-off-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: NChris Ball <cjb@laptop.org>

Clock divider selection in partially verified, so document known facts
in code.
Signed-off-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: NChris Ball <cjb@laptop.org>

For debugging power management features it is convenient to have the
possibility of changing the MMC host controller clock at runtime.  This
patch adds a 'clock' file for this under the MMC host root of debugfs.

Usage is as follows:

	# cat /sys/kernel/debug/mmc0/clock
	52000000

	# echo "1000000000" > /sys/kernel/debug/mmc0/clock
	# cat /sys/kernel/debug/mmc0/clock
	52000000

	# echo "48000000" > /sys/kernel/debug/mmc0/clock
	# cat /sys/kernel/debug/mmc0/clock
	48000000

The middle example shows limits being applied by the host driver.
Signed-off-by: NAndy Shevchenko <ext-andriy.shevchenko@nokia.com>
Cc: Adrian Hunter <adrian.hunter@nokia.com>
[cjb: modify changelog language]
Signed-off-by: NChris Ball <cjb@laptop.org>

Snippet of code for how adaptation layer should handle the call:
/*
 * eMMC spec calls for the host to send 74 clocks to the card
 * during initialization, right after voltage stabilization.
 * create the clocks manually right here.
 */
void generate_init_clocks_A0(struct sdhci_host *host, u8 power_mode)
{
	struct sdhci_mmc_slot *slot = sdhci_priv(host);

	if (slot->power_mode == MMC_POWER_UP &&
	    power_mode == MMC_POWER_ON) {
		/* controller specific code here */
		/* slot->power_mode holds previous power setting */
	}
	slot->power_mode = power_mode;
}
Signed-off-by: NPhilip Rakity <prakity@marvell.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

The SD and MMC code set highspeed using different constants.
Change the sd driver to recognize this and switch to high speed.
Validated code when testing eMMC dual data rate.
Signed-off-by: NPhilip Rakity <prakity@marvell.com>
[cjb: changelog + indentation fixes]
Signed-off-by: NChris Ball <cjb@laptop.org>

This adds the basic identifiers. Due to the various chip quirks it's not
enough to make MRST support very useful for earlier steppings but that can
follow.

(I'm currently trying to verify which steps actually matter outside Intel
 so I can avoid unneeded stuff going upstream)

[Extracted from original development]
Signed-off-by: NJiebingLi <jiebing.li@intel.com>
[Folds in fixes]
Signed-off-by: NChuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Basic support for the Intel Medfield devices

Give them their own quirks as we will need to update this later.
Signed-off-by: NXiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Currently we write it to the chip data, but if the probe handler overrides
it we ignore the new value and keep using our cached one. Fix this so that
a probe handler can adjust the slot count.
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Bring SDIO devices back to full power before their suspend
handler is invoked.

Doing so ensures that SDIO suspend/resume semantics are
maintained (drivers still get to decide whether their
card should be removed or kept during system suspend,
and at what power state), and that SDIO suspend/resume
execution paths are unchanged.

This is achieved by resuming a runtime-suspended SDIO device
in its ->prepare() PM callback (similary to the PCI subsystem).

Since the PM core always increments the run-time usage
counter before calling the ->prepare() callback and decrements
it after calling the ->complete() callback, it is guaranteed
that when the system will come out of suspend, our device's
power state will reflect its runtime PM usage counter.
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

To prevent an erroneous removal of the card, make sure
the device is powered when it is mmc_sdio_detect()ed.

This is required since mmc_sdio_detect may be invoked
while the device is runtime suspended (e.g., MMC core
is rescanning when system comes out of suspend).
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Enable runtime PM for SDIO functions.

SDIO functions are initialized with a disabled runtime PM state,
and are set active (and their usage count is incremented)
only before potential drivers are probed.

SDIO function drivers that support runtime PM should call
pm_runtime_put_noidle() in their probe routine, and
pm_runtime_get_noresume() in their remove routine (very
similarly to PCI drivers).

In case a matching driver does not support runtime PM, power will
always be kept high (since the usage count is positive).
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Enable runtime PM for new SDIO cards.

As soon as the card will be added to the device tree, runtime PM core
will release its power, since it doesn't have any users yet.
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Assign the generic runtime PM handlers for SDIO.

These handlers invoke the relevant SDIO function drivers'
handlers, if exist, otherwise they just return success
(so SDIO drivers don't have to define any runtime PM handlers
unless they need to).

Runtime PM is still disabled by default, so this patch alone
has no immediate effect.
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Add MMC runtime PM handlers, which call mmc_power_save_host
and mmc_power_restore_host in response to runtime_suspend and
runtime_resume events.

Runtime PM is still disabled by default, so this patch alone
has no immediate effect.
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Add a power_restore handler to the SDIO bus ops,
in order to support waking up SDIO cards that
were powered off by runtime pm.
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Allow power save/restore and their relevant mmc_bus_ops handlers
exit with a return value.
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

On resume, let mmc_sdio_init_card go all the way, instead
of skipping the reconfiguration of the card's speed and width.

This is needed to ensure cards wake up with their clock
reconfigured (otherwise it's kept low).

This patch also removes the explicit bus width reconfiguration
on resume, since now this is part of mmc_sdio_init_card.
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Tested-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Some platforms based on sdhci-pltfm need to set their own quirks.
Previously to this patch, the quirks were in drivers/mmc/host/sdhci.h.

This patch splits drivers/mmc/host/sdhci.h into two parts:

* drivers/mmc/host/sdhci.h  includes the HC registers and I/O accessors.
* include/linux/mmc/sdhci.h includes the sdhci structure and quirks.

Instead of including drivers/mmc/host/sdhci.h, -pltfm drivers should
now include include/linux/mmc/sdhci.h and include/linux/sdhci-pltfm.h.

This patch avoids adding/changing the calls/flags in the
sdhci_pltfm_data structure.  It has been tested on STM platforms
(e.g. STx7106, STx7108, STx5206) where the driver is configured
and used as shown in the example below:

[snip]
static int mmc_pad_resources(struct sdhci_host *sdhci)
{
	if (!devm_stm_pad_claim(sdhci->mmc->parent,
				&stx7108_mmc_pad_config,
				dev_name(sdhci->mmc->parent)))
		return -ENODEV;

	return 0;
}

static struct sdhci_pltfm_data stx7108_mmc_platform_data = {
	.init = mmc_pad_resources,
	.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
};

static struct platform_device stx7108_mmc_device = {
	.name = "sdhci",
[snip]

Note: drivers/mmc/host/sdhci.h now also includes linux/mmc/sdhci.h,
and no modifications should be needed on other sdhci-<XXX> drivers.
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch fixes a warning when compiling the sdhci driver:
  pwr may be used uninitialized in sdhci_set_power

Tested with the following compiler versions: 4.2.4 and 4.4.4
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch adds the suspend and resume functions
in the sdhci-pltfm device driver.
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

Usually there are multiple mmc host controllers; rename mmc queue thread
by host index so we can easily identify which controller it belongs to.
Signed-off-by: NEthan Du <ethan.too@gmail.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

One flaw with DDR support is that MMC core does not inform the driver
which DDR mode it has selected.  This patch expands the ios->ddr flag
to do that.
Signed-off-by: NAdrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: NChris Ball <cjb@laptop.org>