serial: imx: add DMA support for imx6q

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We only enable the DMA support when the following are meet:

  [1] The uart port supports the hardware flow control(CTS/RTS).
      (Some uart port does not support the CTS/RTS.)

  [2] The application enables the CTS/RTS.

  [3] The Soc is imx6q.
      For the sdma's firmware limit, we do not support the DMA except
      the imx6q platform.

  [4] The uart is not used as a console.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Huang Shijie

2013-07-08 17:14:18 +08:00

committed by Greg Kroah-Hartman

parent 09bd00f6e9

commit b4cdc8f61b

1 changed files with 400 additions and 5 deletions

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drivers/tty/serial/imx.c

+400 -5

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