• Boris Brezillon's avatar
    mtd: introduce the mtd_pairing_scheme concept · 477b0229
    Boris Brezillon authored
    MLC and TLC NAND devices are using NAND cells exposing more than one bit,
    but instead of attaching all the bits in a given cell to a single NAND
    page, each bit is usually attached to a different page. This concept is
    called 'page pairing', and has significant impacts on the flash storage
    usage.
    The main problem showed by these devices is that interrupting a page
    program operation may not only corrupt the page we are programming
    but also the page it is paired with, hence the need to expose to MTD
    users the pairing scheme information.
    
    The pairing APIs allows one to query pairing information attached to a
    given page (here called wunit), or the other way around (the wunit
    pointed by pairing information).
    It also provides several helpers to help the conversion between absolute
    offsets and wunits, and query the number of pairing groups.
    Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
    Reviewed-by: default avatarBrian Norris <computersforpeace@gmail.com>
    477b0229
mtd.h 18.7 KB