target/linux/rb532/patches-2.6.28/005-pata_rb532_cf_4bytes_rw.patch

   1 * rename the offset definition to avoid abiguity with the standard ATA
   2   IO address
   3 * read and write four bytes at once like the original driver does
   4 * use writesl() and readsl() which implicitly iterate over the data
   5
   6 This patch assumes buflen to be a multiple of four, which is true for
   7 ATA devices. ATAPI support is not known, though unlikely, as the
   8 original driver always transfers 512 Bytes at once.
   9
  10 Signed-off-by: Phil Sutter <n0-1@freewrt.org>
  11 Acked-by: Sergei Shtyltov <sshtylyov@ru.mvista.com>
  12 ---
  13 --- a/drivers/ata/pata_rb532_cf.c
  14 +++ b/drivers/ata/pata_rb532_cf.c
  15 @@ -82,13 +82,10 @@ static unsigned int rb532_pata_data_xfer
  16         void __iomem *ioaddr = ap->ioaddr.data_addr;
  17         int retlen = buflen;
  18
  19 -       if (write_data) {
  20 -               for (; buflen > 0; buflen--, buf++)
  21 -                       writeb(*buf, ioaddr);
  22 -       } else {
  23 -               for (; buflen > 0; buflen--, buf++)
  24 -                       *buf = readb(ioaddr);
  25 -       }
  26 +       if (write_data)
  27 +               writesl(ioaddr, buf, buflen / sizeof(u32));
  28 +       else
  29 +               readsl(ioaddr, buf, buflen / sizeof(u32));
  30
  31         rb532_pata_finish_io(adev->link->ap);
  32         return retlen;