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| author | Robert Baldyga <r.baldyga@samsung.com> | 2014-12-10 12:49:27 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-09 14:25:39 -0800 |
| commit | b543c301c2c5fbf24ed160a0c227122f09f38e5f (patch) | |
| tree | b03b32eb6a783fbd68ebccd9567306eef33ba08f /drivers/tty/serial/samsung.h | |
| parent | 29bef79908459d20a7a3db654bceb8f3ce4601dc (diff) | |
| download | blackbird-obmc-linux-b543c301c2c5fbf24ed160a0c227122f09f38e5f.tar.gz blackbird-obmc-linux-b543c301c2c5fbf24ed160a0c227122f09f38e5f.zip | |
serial: samsung: add DMA support for RX
Add RX DMA transfers support for samsung serial driver. It's enabled
when DMA controller for RX channel is specified in device-tree.
DMA transactions are started when number of bytes in RX FIFO reaches
trigger level, otherwise PIO mode is used. DMA transfer size is always
PAGE_SIZE which can cause large latency when smaller data amount is
transferred, so we always terminate DMA transaction on RX timeout
interrupt. Timeout interval is set to 64 frame times.
Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/samsung.h')
| -rw-r--r-- | drivers/tty/serial/samsung.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h index e60011c591e8..d275032aa68d 100644 --- a/drivers/tty/serial/samsung.h +++ b/drivers/tty/serial/samsung.h @@ -88,6 +88,7 @@ struct s3c24xx_uart_port { unsigned int tx_in_progress; unsigned int tx_mode; + unsigned int rx_mode; struct s3c24xx_uart_info *info; struct clk *clk; |
