1. 18 7月, 2007 1 次提交
    • M
      zs: move to the serial subsystem · 8b4a4080
      Maciej W. Rozycki 提交于
      This is a reimplementation of the zs driver for the serial subsystem.  Any
      resemblance to the old driver is purely coincidential.  ;-) I do hope I got
      the handling of modem lines right -- better do not tackle me about the
      issue unless you feel too good...
      
      Any users of the old driver: please note the numbers of the serial lines
      have now been swapped, i.e.  ttyS0 <-> ttyS1 and ttyS2 <-> ttyS3.  It has
      to do with the modem lines mentioned above; basically the port A in a given
      chip has to be initialised before the port B if you want to use the latter
      as the serial console (which is usually the case), as operations on modem
      lines of the serial line associated with the port B access both ports (see
      the comment at the top of the driver for the details of wiring used).
      Please update your scripts.
      
      This is also the reason each SCC now requests an IRQ once only (as seen in
      "/proc/interrupts") -- the handler takes care of both ports at once as the
      line associated with the port B has to take status update interrupts from
      both ports (and yet the line of the port A takes its own for itself too).
      The old driver never got it right...
      Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      8b4a4080
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