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serial: amba-pl011: factor out code for writing LCR_H register

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The code to cope with a split tx/rx LCR_H register is non-trivial
so put it into it's own function to avoid duplication.

Signed-off-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jon Medhurst 2013-12-10 10:18:59 +00:00 committed by Greg Kroah-Hartman
parent fe43390702
commit b60f2f66a5
1 changed files with 17 additions and 22 deletions
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39
drivers/tty/serial/amba-pl011.c
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@ -1511,6 +1511,21 @@ static int pl011_hwinit(struct uart_port *port)
return retval;
}
static void pl011_write_lcr_h(struct uart_amba_port *uap, unsigned int lcr_h)
{
writew(lcr_h, uap->port.membase + uap->lcrh_rx);
if (uap->lcrh_rx != uap->lcrh_tx) {
int i;
/*
* Wait 10 PCLKs before writing LCRH_TX register,
* to get this delay write read only register 10 times
*/
for (i = 0; i < 10; ++i)
writew(0xff, uap->port.membase + UART011_MIS);
writew(lcr_h, uap->port.membase + uap->lcrh_tx);
}
}
static int pl011_startup(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
@ -1541,17 +1556,7 @@ static int pl011_startup(struct uart_port *port)
writew(cr, uap->port.membase + UART011_CR);
writew(0, uap->port.membase + UART011_FBRD);
writew(1, uap->port.membase + UART011_IBRD);
writew(0, uap->port.membase + uap->lcrh_rx);
if (uap->lcrh_tx != uap->lcrh_rx) {
int i;
/*
* Wait 10 PCLKs before writing LCRH_TX register,
* to get this delay write read only register 10 times
*/
for (i = 0; i < 10; ++i)
writew(0xff, uap->port.membase + UART011_MIS);
writew(0, uap->port.membase + uap->lcrh_tx);
}
pl011_write_lcr_h(uap, 0);
writew(0, uap->port.membase + UART01x_DR);
while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_BUSY)
barrier();
@ -1801,17 +1806,7 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
* UART011_FBRD & UART011_IBRD.
* ----------^----------^----------^----------^-----
*/
writew(lcr_h, port->membase + uap->lcrh_rx);
if (uap->lcrh_rx != uap->lcrh_tx) {
int i;
/*
* Wait 10 PCLKs before writing LCRH_TX register,
* to get this delay write read only register 10 times
*/
for (i = 0; i < 10; ++i)
writew(0xff, uap->port.membase + UART011_MIS);
writew(lcr_h, port->membase + uap->lcrh_tx);
}
pl011_write_lcr_h(uap, lcr_h);
writew(old_cr, port->membase + UART011_CR);
spin_unlock_irqrestore(&port->lock, flags);