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serial: imx: add imx_poll_init()

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For the console poll usage, .poll_init() will perform deeper hardware
initialization to ensure the serial port is always active.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Huang Shijie <b32955@freescale.com>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Thompson 2014-10-28 09:28:08 +01:00 committed by Greg Kroah-Hartman
parent f968ef3494
commit 6b8bdad961
1 changed files with 36 additions and 0 deletions
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36
drivers/tty/serial/imx.c
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@ -1455,6 +1455,41 @@ imx_verify_port(struct uart_port *port, struct serial_struct *ser)
}
#if defined(CONFIG_CONSOLE_POLL)
static int imx_poll_init(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
unsigned long flags;
unsigned long temp;
int retval;
retval = clk_prepare_enable(sport->clk_ipg);
if (retval)
return retval;
retval = clk_prepare_enable(sport->clk_per);
if (retval)
clk_disable_unprepare(sport->clk_ipg);
imx_setup_ufcr(sport, 0);
spin_lock_irqsave(&sport->port.lock, flags);
temp = readl(sport->port.membase + UCR1);
if (is_imx1_uart(sport))
temp |= IMX1_UCR1_UARTCLKEN;
temp |= UCR1_UARTEN | UCR1_RRDYEN;
temp &= ~(UCR1_TXMPTYEN | UCR1_RTSDEN);
writel(temp, sport->port.membase + UCR1);
temp = readl(sport->port.membase + UCR2);
temp |= UCR2_RXEN;
writel(temp, sport->port.membase + UCR2);
spin_unlock_irqrestore(&sport->port.lock, flags);
return 0;
}
static int imx_poll_get_char(struct uart_port *port)
{
if (!(readl_relaxed(port->membase + USR2) & USR2_RDR))
@ -1499,6 +1534,7 @@ static struct uart_ops imx_pops = {
.config_port = imx_config_port,
.verify_port = imx_verify_port,
#if defined(CONFIG_CONSOLE_POLL)
.poll_init = imx_poll_init,
.poll_get_char = imx_poll_get_char,
.poll_put_char = imx_poll_put_char,
#endif