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serial: sh-sci: modify sci_break_ctl()

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SCIF modules which have SCSPTR can output the break signal. Now that we
have a way of determining port features/capabilities, add trivial break
control via SCSPTR support. Tested on sh7757lcr.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Shimoda, Yoshihiro 2012-04-06 09:59:14 +09:00 committed by Paul Mundt
parent 0034102808
commit bbb4ce50f3
2 changed files with 28 additions and 4 deletions
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30
drivers/tty/serial/sh-sci.c
View File

@ -1564,10 +1564,32 @@ static void sci_enable_ms(struct uart_port *port)
static void sci_break_ctl(struct uart_port *port, int break_state)
{
/*
* Not supported by hardware. Most parts couple break and rx
* interrupts together, with break detection always enabled.
*/
struct sci_port *s = to_sci_port(port);
unsigned short scscr, scsptr;
switch (s->cfg->regtype) {
case SCIx_SH4_SCIF_REGTYPE:
scsptr = serial_port_in(port, SCSPTR);
scscr = serial_port_in(port, SCSCR);
if (break_state == -1) {
scsptr = (scsptr | SCSPTR_SPB2IO) & ~SCSPTR_SPB2DT;
scscr &= ~SCSCR_TE;
} else {
scsptr = (scsptr | SCSPTR_SPB2DT) & ~SCSPTR_SPB2IO;
scscr |= SCSCR_TE;
}
serial_port_out(port, SCSPTR, scsptr);
serial_port_out(port, SCSCR, scscr);
break;
default:
/*
* Not supported by hardware. Most parts couple break and rx
* interrupts together, with break detection always enabled.
*/
break;
}
}
#ifdef CONFIG_SERIAL_SH_SCI_DMA

2
include/linux/serial_sci.h
View File

@ -52,6 +52,8 @@ enum {
/* SCSPTR, optional */
#define SCSPTR_RTSIO (1 << 7)
#define SCSPTR_CTSIO (1 << 5)
#define SCSPTR_SPB2IO (1 << 1)
#define SCSPTR_SPB2DT (1 << 0)
/* Offsets into the sci_port->irqs array */
enum {