RFC: PCI SD host controller driver & mmc/mmcsd modules improvements

[Jacques Fourie]

> Alexander Motin wrote:
>>
>> I would like to present initial revision of my generic PCI SD Host
>> Controller driver (sdhci). It support PCI devices with class 8 and subclass
>> 5 according to SD Host Controller Specification.
>> Latest patches against 8-CURRENT (mostly fit 7-STABLE) may be found at:
>> http://people.freebsd.org/~mav/sdhci/
>
> For those who are not tracking actively, I would like to report that most of
> original driver's child illnesses are now healed.
>
> Driver now supports both PIO and DMA modes. Because of some special tunings
> DMA works fine even on almost broken ENE chips. I am reaching 15MB/s
> transfer (maximum for my controller's bus) with only about 1% of CPU load.
> Implemented 4 bits bus width and high speed timing modes support for high
> data rates up to 52MHz. Cards hot insertion/removing is now working.
> Together with in-tree mmc/mmcsd drivers improvements most of card types (SD,
> SDHC, standard and high capacity MMC) are now supported.
>
> --
> Alexander Motin
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>

The device in my HP nw8240 notebook is a Texas Instruments 7621. This
device is a multi-function PCI device with a CardBus, firewire, Flash
Media and SD controller. The only way that I could get this driver to
work for me is to disable SD card detection on the Flash Media
controller, which is function 3 :

pcitweak -w 02:06:03 -b 0x4c 0x02

Thanks for the great work!