Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC: r227309 (partial)

Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.

The SYSCTL_NODE macro defines a list that stores all child-elements of
that node. If there's no SYSCTL_DECL macro anywhere else, there's no
reason why it shouldn't be static.

Merge 231266 from head:
Add support for RICOH R5CE823 card reader, that can be found in
some Lenovo laptops.

The conroller needs a quirk to lower its frequency, and after
that it operates normally.

Toss bogus mergeinfo.

MFC r235634

Fix and update battery status bits according to linux driver

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix read_ivar implementation for MMC and SD.

1. Both mmc_read_ivar() and sdhci_read_ivar() use the expression
'*(int *)result = val' to assign to result which is uintptr_t *.
This does not work on big-endian 64 bit systems.

2. The media_size ivar is declared as 'off_t' which does not fit
into uintptr_t in 32bit systems, change this to long.

Submitted by: kanthms at netlogicmicro com (initial version)

Force DMA for controller found in Lenovo T510 (probably in others too).
This makes reads 10 times faster.

Discussed with: mav

Add support for interruptless kernel dumping.

Fix read_ivar prototype.

Add hw.sdhci.debug sysctl to control debug level.

Cleanup msleep() arguments.
Move wakeup() out of the lock.

Forget current bus power settings on full reset. Chip must be reconfigured.

Do not issue command if there is no card, clock or power.
Controller will not detect command timeout without clock active.

Add controller suspend/resume support.

To be able to correctly suspend/resume with card inserted,
respective support should be also implemented at mmc and mmcsd layers.

Allow card reader bridge driver to report maximum supported transfer size.
sdhci supports up to 65535 blocks transfers, at91_mci - one block.

Enable multiblock operations disabled before to follow at91_mci driver
limitations.

Reviewed by: imp@

Import sdhci (PCI SD Host Controller) driver.
Driver supports PCI devices with class 8 and subclass 5 according to
SD Host Controller Specification.

Update NOTES, enable module and static build.
Enable related mmc and mmcsd modules build.

Discussed on: mobile@, current@