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uart: pl011: Improve LCRH register access decision

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Improve LCRH register access decision as ARM PL011 lcrh
register serve as both TX and RX, while other SOC may
implement TX and RX function with separated register.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jun Nie 2015-07-31 15:49:18 +08:00 committed by Greg Kroah-Hartman
parent 2c096a9eed
commit 09dcc7dfc0
1 changed files with 7 additions and 2 deletions
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9
drivers/tty/serial/amba-pl011.c
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@ -249,6 +249,11 @@ struct uart_amba_port {
#endif
};
static bool is_implemented(struct uart_amba_port *uap, unsigned int reg)
{
return uap->reg_lut[reg] != (u16)~0;
}
static unsigned int pl011_readw(struct uart_amba_port *uap, int index)
{
WARN_ON(index > REG_NR);
@ -1649,7 +1654,7 @@ static int pl011_hwinit(struct uart_port *port)
static void pl011_write_lcr_h(struct uart_amba_port *uap, unsigned int lcr_h)
{
pl011_writew(uap, lcr_h, uap->lcrh_rx);
if (uap->lcrh_rx != uap->lcrh_tx) {
if (is_implemented(uap, REG_ST_LCRH_RX)) {
int i;
/*
* Wait 10 PCLKs before writing LCRH_TX register,
@ -1784,7 +1789,7 @@ static void pl011_disable_uart(struct uart_amba_port *uap)
* disable break condition and fifos
*/
pl011_shutdown_channel(uap, uap->lcrh_rx);
if (uap->lcrh_rx != uap->lcrh_tx)
if (is_implemented(uap, REG_ST_LCRH_RX))
pl011_shutdown_channel(uap, uap->lcrh_tx);
}