diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2011-11-24 20:20:53 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2011-11-24 20:20:53 +0900 |
| commit | dc7e3ef7dade7041fb1809f2a5403efac655a791 (patch) | |
| tree | 0ff9ec0b0ee270c9c737b15ae66462aefba9abff /drivers/tty | |
| parent | cdf7c42fece7c641fcb85cfbf190fdc2a95d19ac (diff) | |
| download | linux-dc7e3ef7dade7041fb1809f2a5403efac655a791.tar.bz2 | |
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 680d34af71f9..46deaaec836d 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -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) |