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ARM: 5933/1: amba-pl011: support hardware flow control 

Enable/disable automatic hardware flow control as requested by the
termios.  The controller does not allow us to control the RTS line when
auto-RTS is enabled, so we enable auto-RTS only if the kernel has not
disabled RTS.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rabin Vincent 2010-02-12 06:43:11 +01:00 committed by Russell King
parent 18fe1cad88
commit 3b43816f68
1 changed files with 19 additions and 0 deletions
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19
drivers/serial/amba-pl011.c
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@ -71,6 +71,7 @@ struct uart_amba_port {
unsigned int im; /* interrupt mask */
unsigned int old_status;
unsigned int ifls; /* vendor-specific */
bool autorts;
};
/* There is by now at least one vendor with differing details, so handle it */
@ -308,6 +309,11 @@ static void pl011_set_mctrl(struct uart_port *port, unsigned int mctrl)
TIOCMBIT(TIOCM_OUT1, UART011_CR_OUT1);
TIOCMBIT(TIOCM_OUT2, UART011_CR_OUT2);
TIOCMBIT(TIOCM_LOOP, UART011_CR_LBE);
if (uap->autorts) {
/* We need to disable auto-RTS if we want to turn RTS off */
TIOCMBIT(TIOCM_RTS, UART011_CR_RTSEN);
}
#undef TIOCMBIT
writew(cr, uap->port.membase + UART011_CR);
@ -437,6 +443,7 @@ static void pl011_shutdown(struct uart_port *port)
/*
* disable the port
*/
uap->autorts = false;
writew(UART01x_CR_UARTEN | UART011_CR_TXE, uap->port.membase + UART011_CR);
/*
@ -456,6 +463,7 @@ static void
pl011_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int lcr_h, old_cr;
unsigned long flags;
unsigned int baud, quot;
@ -532,6 +540,17 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
old_cr = readw(port->membase + UART011_CR);
writew(0, port->membase + UART011_CR);
if (termios->c_cflag & CRTSCTS) {
if (old_cr & UART011_CR_RTS)
old_cr |= UART011_CR_RTSEN;
old_cr |= UART011_CR_CTSEN;
uap->autorts = true;
} else {
old_cr &= ~(UART011_CR_CTSEN | UART011_CR_RTSEN);
uap->autorts = false;
}
/* Set baud rate */
writew(quot & 0x3f, port->membase + UART011_FBRD);
writew(quot >> 6, port->membase + UART011_IBRD);