diff options
| author | Fabio Estevam <festevam@gmail.com> | 2011-12-13 01:23:48 -0200 |
|---|---|---|
| committer | Eric Miao <eric.miao@linaro.org> | 2012-01-11 13:51:37 +0800 |
| commit | a27acc5f824bcbee91f405d3368d9be9efecefea (patch) | |
| tree | 5b95318ab05174a4b14ce24cd259b2fa40b453af | |
| parent | 6155aface4a5048b6398fe2b5bc33687db9fb26b (diff) | |
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>
| -rw-r--r-- | drivers/tty/serial/imx.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index e018aef88df..0f4ba212fd6 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); |