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serial: sh-sci: Add support for loopback mode. 

This plugs in loopback control for SCFCR-enabled ports and plugs it in
via the TIOCM_LOOP control, as others do.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2011-11-24 20:20:53 +09:00
parent cdf7c42fec
commit dc7e3ef7da
1 changed files with 14 additions and 1 deletions
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15
drivers/tty/serial/sh-sci.c
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@ -1113,10 +1113,23 @@ static unsigned int sci_tx_empty(struct uart_port *port)
* handled via the ->init_pins() op, which is a bit of a one-way street,
* lacking any ability to defer pin control -- this will later be
* converted over to the GPIO framework).
*
* Other modes (such as loopback) are supported generically on certain
* port types, but not others. For these it's sufficient to test for the
* existence of the support register and simply ignore the port type.
*/
static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* Nothing to do here. */
if (mctrl & TIOCM_LOOP) {
struct plat_sci_reg *reg;
/*
* Standard loopback mode for SCFCR ports.
*/
reg = sci_getreg(port, SCFCR);
if (reg->size)
sci_out(port, SCFCR, sci_in(port, SCFCR) | 1);
}
}
static unsigned int sci_get_mctrl(struct uart_port *port)