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authorFabio Estevam <festevam@gmail.com>2011-12-13 07:23:48 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-05 04:30:33 +0400
commitdb1a9b55004c83ded54c1f869f81a8a59c6dde87 (patch)
tree760d3165b96af9069b64f861f538855f0d00dd99 /drivers/tty/serial/imx.c
parent59087384e41e33ed070575aa4a834a7ff7d67e77 (diff)
downloadlinux-db1a9b55004c83ded54c1f869f81a8a59c6dde87.tar.xz
tty: serial: imx: Allow UART to be a source for wakeup
Allow UART to be a source for wakeup from low power mode. Tested on a MX27PDK by doing: echo enabled > /sys/devices/platform/imx21-uart.0/tty/ttymxc0/power/wakeup echo mem > /sys/power/state and then pressing a key in the console will wakeup the sytem. Suggested-by: Shawn Guo <shawn.guo@freescale.com> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Tested-by: Richard Zhao <richard.zhao@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/serial/imx.c')
-rw-r--r--drivers/tty/serial/imx.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 962cafa175f7..ed6e1448e7eb 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -566,6 +566,9 @@ static irqreturn_t imx_int(int irq, void *dev_id)
if (sts & USR1_RTSD)
imx_rtsint(irq, dev_id);
+ if (sts & USR1_AWAKE)
+ writel(USR1_AWAKE, sport->port.membase + USR1);
+
return IRQ_HANDLED;
}
@@ -1269,6 +1272,12 @@ static struct uart_driver imx_reg = {
static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
{
struct imx_port *sport = platform_get_drvdata(dev);
+ unsigned int val;
+
+ /* enable wakeup from i.MX UART */
+ val = readl(sport->port.membase + UCR3);
+ val |= UCR3_AWAKEN;
+ writel(val, sport->port.membase + UCR3);
if (sport)
uart_suspend_port(&imx_reg, &sport->port);
@@ -1279,6 +1288,12 @@ static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
static int serial_imx_resume(struct platform_device *dev)
{
struct imx_port *sport = platform_get_drvdata(dev);
+ unsigned int val;
+
+ /* disable wakeup from i.MX UART */
+ val = readl(sport->port.membase + UCR3);
+ val &= ~UCR3_AWAKEN;
+ writel(val, sport->port.membase + UCR3);
if (sport)
uart_resume_port(&imx_reg, &sport->port);