[PATCH v4] tty: serial: imx: Allow UART to be a source for wakeup

[Fabio Estevam]

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/power/wakeup

echo mem > /sys/power/state

and then pressing a key in the console will wakeup the sytem.

Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
---
Changes since v3:
- Remove IMXUART_CANWAKE flag. Let userspace write in /sys/ file
in order to enable UART wakeup source.
Changes since v2:
- Remove incorrect enable_irq_wake from serial_imx_resume
Changes since v1:
- Pass the can-wake property via DT correctly
 drivers/tty/serial/imx.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 163fc90..283bf21 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 +1272,15 @@ 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;
+
+	if (device_may_wakeup(&dev->dev)) {
+		enable_irq_wake(sport->rxirq);
+		/* 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 +1291,15 @@ 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;
+
+	if (device_may_wakeup(&dev->dev)) {
+		/* disable wakeup from i.MX UART */
+		val = readl(sport->port.membase + UCR3);
+		val &= ~UCR3_AWAKEN;
+		writel(val, sport->port.membase + UCR3);
+		disable_irq_wake(sport->rxirq);
+	}
 
 	if (sport)
 		uart_resume_port(&imx_reg, &sport->port);
@@ -1408,6 +1429,9 @@ static int serial_imx_probe(struct platform_device *pdev)
 		goto deinit;
 	platform_set_drvdata(pdev, &sport->port);
 
+	device_init_wakeup(&pdev->dev, 1);
+	device_set_wakeup_enable(&pdev->dev, 0);
+
 	return 0;
 deinit:
 	if (pdata && pdata->exit)
-- 
1.7.1