Re: RFC: PCI SD host controller driver & mmc/mmcsd modules improvements
Rui Paulo <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.mobile,gmane.os.freebsd.devel.arm,gmane.os.freebsd.current |
|---|---|
| Message-ID | <[email protected]> |
On 27 Sep 2008, at 22:43, Alexander Motin <[email protected]> wrote: > Hi. > > 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. With some > limitations it successfully works on my Acer TM6292 notebook with > ENE CB714 card reader. > > Things that are working now: > - PIO mode single and multiple block read and write, > - 1 and 4 bits bus width support. > > In PIO mode with 4GB SD card on 30MHz 4bit bus I have reached about > 3.5MB/s (limited by CPU) linear read and 7MB/s (limited by card) > linear write. Small blocks read/write performance limited by card. > > Things that are not working yet: > - DMA modes (code is written, but as my controller looks like has > broken DMA I have no ability to debug it), > - card insert/remove detection (need more thinking), you should > reload mmc module to rescan cards, > - SDHC and MMC cards (have no such cards now to debug that code), > only standard capacity SD Memory cards up to 4GB size are supported > now, > - high speed (double rate) bus mode (need more thinking and DMA > support). > > Also to get such results I have improved existing mmc and mmcsd > drivers a bit. mmc driver got: > - 4 bit bus width support, > - write protection switch support, > - cards with more then 2GB capacity support. > mmcsd driver got: > - multiple block read and write support, > - cards with more then 2GB capacity support, > - I/O error reporting, > - write protection switch support. > > Latest patches against 8-CURRENT (should also fit 7-STABLE) may be > found at: > http://people.freebsd.org/~mav/sdhci/ > > I will be grateful for any feedbacks, comments and support. Well, here's my support: Great work! :-) -- Rui Paulo _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-mobile To unsubscribe, send any mail to "[email protected]"