@@ -8,6 +8,8 @@ Required properties:
Optional properties:
- fsl,uart-has-rtscts : Indicate the uart has rts and cts
- fsl,irda-mode : Indicate the uart supports irda mode
+- fsl,uart-can-wake : Indicate that uart can be a source for wakeup from
+low-power mode
Example:
@@ -21,6 +21,7 @@
#define IMXUART_HAVE_RTSCTS (1<<0)
#define IMXUART_IRDA (1<<1)
+#define IMXUART_CANWAKE (1<<2)
struct imxuart_platform_data {
int (*init)(struct platform_device *pdev);
@@ -200,6 +200,7 @@ struct imx_port {
int txirq,rxirq,rtsirq;
unsigned int have_rtscts:1;
unsigned int use_irda:1;
+ unsigned int can_wake:1;
unsigned int irda_inv_rx:1;
unsigned int irda_inv_tx:1;
unsigned short trcv_delay; /* transceiver delay */
@@ -566,6 +567,9 @@ 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;
}
@@ -660,6 +664,7 @@ static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
static int imx_startup(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
+ struct tty_struct *tty;
int retval;
unsigned long flags, temp;
@@ -791,6 +796,8 @@ static int imx_startup(struct uart_port *port)
if (pdata->irda_enable)
pdata->irda_enable(1);
}
+ tty = sport->port.state->port.tty;
+ device_set_wakeup_enable(tty->dev, 1);
return 0;
@@ -1269,6 +1276,15 @@ 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 +1295,15 @@ 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);
@@ -1311,6 +1336,9 @@ static int serial_imx_probe_dt(struct imx_port *sport,
if (of_get_property(np, "fsl,irda-mode", NULL))
sport->use_irda = 1;
+ if (of_get_property(np, "fsl,uart-can-wake", NULL))
+ sport->can_wake = 1;
+
sport->devdata = of_id->data;
return 0;
@@ -1339,6 +1367,9 @@ static void serial_imx_probe_pdata(struct imx_port *sport,
if (pdata->flags & IMXUART_IRDA)
sport->use_irda = 1;
+
+ if (pdata->flags & IMXUART_CANWAKE)
+ sport->can_wake = 1;
}
static int serial_imx_probe(struct platform_device *pdev)
@@ -1408,6 +1439,11 @@ static int serial_imx_probe(struct platform_device *pdev)
goto deinit;
platform_set_drvdata(pdev, &sport->port);
+ if (sport->can_wake)
+ device_init_wakeup(&pdev->dev, 1);
+ else
+ device_init_wakeup(&pdev->dev, 0);
+
return 0;
deinit:
if (pdata && pdata->exit)
Allow UART to be a source for wakeup from low power mode. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> --- Changes since v2: - Remove incorrect enable_irq_wake from serial_imx_resume Changes since v1: - Pass the can-wake property via DT correctly .../bindings/tty/serial/fsl-imx-uart.txt | 2 + arch/arm/plat-mxc/include/mach/imx-uart.h | 1 + drivers/tty/serial/imx.c | 36 ++++++++++++++++++++ 3 files changed, 39 insertions(+), 0 deletions(-)