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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>
This commit is contained in:
Qipan Li 2015-05-14 06:45:25 +00:00 committed by Greg Kroah-Hartman
parent d9e8e976fa
commit 7f60f2fe16
2 changed files with 21 additions and 1 deletions
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20
drivers/tty/serial/sirfsoc_uart.c
View File

@ -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) {

2
drivers/tty/serial/sirfsoc_uart.h
View File

@ -322,7 +322,7 @@ struct sirfsoc_uart_register sirfsoc_uart = {
#define SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET 24
#define SIRFSOC_USP_ASYNC_DIV2_MASK 0x3f
#define SIRFSOC_USP_ASYNC_DIV2_OFFSET 16
#define SIRFSOC_USP_LOOP_BACK_CTRL BIT(2)
/* USP-UART Common */
#define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000)
#define SIRFUART_RECV_TIMEOUT_VALUE(x) \