Re: RFC: PCI SD host controller driver & mmc/mmcsd modules improvements
"M. Warner Losh" <[email protected]>
| Newsgroups | gmane.os.freebsd.current,gmane.os.freebsd.devel.arm,gmane.os.freebsd.devel.mobile |
|---|---|
| Message-ID | <[email protected]> |
In message: <[email protected]> Alexander Motin <[email protected]> writes: : 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. I'll take a look at the driver and post a code review... Warner _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[email protected]"