1. 23 Feb, 2011 4 commits
  2. 22 Feb, 2011 8 commits
  3. 17 Feb, 2011 27 commits
  4. 04 Feb, 2011 1 commit
    • Stephen Boyd's avatar
      hvc_dcc: Simplify assembly for v6 and v7 ARM · 8e6d3fe1
      Stephen Boyd authored
      The inline assembly differences for v6 vs. v7 in the hvc_dcc
      driver are purely optimizations. On a v7 processor, an mrc with
      the pc sets the condition codes to the 28-31 bits of the register
      being read. It just so happens that the TX/RX full bits the DCC
      driver is testing for are high enough in the register to be put
      into the condition codes. On a v6 processor, this "feature" isn't
      implemented and thus we have to do the usual read, mask, test
      operations to check for TX/RX full.
      
      Since we already test the RX/TX full bits before calling
      __dcc_getchar() and __dcc_putchar() we don't actually need to do
      anything special for v7 over v6. The only difference is in
      hvc_dcc_get_chars(). We would test RX full, poll RX full, and
      then read a character from the buffer, whereas now we will test
      RX full, read a character from the buffer, and then test RX full
      again for the second iteration of the loop. It doesn't seem
      possible for the buffer to go from full to empty between testing
      the RX full and reading a character. Therefore, replace the v7
      versions with the v6 versions and everything works the same.
      Acked-by: default avatarTony Lindgren <tony@atomide.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
      Cc: Daniel Walker <dwalker@codeaurora.org>
      Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      8e6d3fe1