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| author | Qipan Li <Qipan.Li@csr.com> | 2015-05-14 08:45:25 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 21:50:41 +0200 |
| commit | 7f60f2fe16206d5db6a228dfe1de5ea0a9e5da46 (patch) | |
| tree | 6ba0de32add0c54ef2ad25241645f60e6f0bea8f /drivers/tty/serial/sirfsoc_uart.c | |
| parent | serial: sirf: add uart receive's some error counter and mark (diff) | |
| download | linux-7f60f2fe16206d5db6a228dfe1de5ea0a9e5da46.tar.xz linux-7f60f2fe16206d5db6a228dfe1de5ea0a9e5da46.zip | |
serial: sirf: add serial loopback function support
Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/sirfsoc_uart.c')
| -rw-r--r-- | drivers/tty/serial/sirfsoc_uart.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c index a5007216338d..0e4379939703 100644 --- a/drivers/tty/serial/sirfsoc_uart.c +++ b/drivers/tty/serial/sirfsoc_uart.c @@ -108,6 +108,26 @@ static void sirfsoc_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) unsigned int val = assert ? SIRFUART_AFC_CTRL_RX_THD : 0x0; unsigned int current_val; + if (mctrl & TIOCM_LOOP) { + if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) + wr_regl(port, ureg->sirfsoc_line_ctrl, + rd_regl(port, ureg->sirfsoc_line_ctrl) | + SIRFUART_LOOP_BACK); + else + wr_regl(port, ureg->sirfsoc_mode1, + rd_regl(port, ureg->sirfsoc_mode1) | + SIRFSOC_USP_LOOP_BACK_CTRL); + } else { + if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) + wr_regl(port, ureg->sirfsoc_line_ctrl, + rd_regl(port, ureg->sirfsoc_line_ctrl) & + ~SIRFUART_LOOP_BACK); + else + wr_regl(port, ureg->sirfsoc_mode1, + rd_regl(port, ureg->sirfsoc_mode1) & + ~SIRFSOC_USP_LOOP_BACK_CTRL); + } + if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled) return; if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { |