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 diff -urN linux-2.6.28.7/drivers/ata/pata_rb532_cf.c linux-2.6.28.7.new/drivers/ata/pata_rb532_cf.c
  14 --- linux-2.6.28.7/drivers/ata/pata_rb532_cf.c  2009-03-15 13:24:24.000000000 +0100
  15 +++ linux-2.6.28.7.new/drivers/ata/pata_rb532_cf.c      2009-03-15 13:26:19.000000000 +0100
  16 @@ -82,13 +82,10 @@
  17         void __iomem *ioaddr = ap->ioaddr.data_addr;
  18         int retlen = buflen;
  19
  20 -       if (write_data) {
  21 -               for (; buflen > 0; buflen--, buf++)
  22 -                       writeb(*buf, ioaddr);
  23 -       } else {
  24 -               for (; buflen > 0; buflen--, buf++)
  25 -                       *buf = readb(ioaddr);
  26 -       }
  27 +       if (write_data)
  28 +               writesl(ioaddr, buf, buflen / sizeof(u32));
  29 +       else
  30 +               readsl(ioaddr, buf, buflen / sizeof(u32));
  31
  32         rb532_pata_finish_io(adev->link->ap);
  33         return retlen;