1 files changed, 347 insertions, 119 deletions

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index f0b9f6b52b3..d017cec8a34 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -39,10 +39,13 @@
 #include <linux/irq.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
+#include <linux/of_irq.h>
 #include <linux/gpio.h>
-#include <linux/pinctrl/consumer.h>
+#include <linux/of_gpio.h>
 #include <linux/platform_data/serial-omap.h>
 
+#include <dt-bindings/gpio/gpio.h>
+
 #define OMAP_MAX_HSUART_PORTS	6
 
 #define UART_BUILD_REVISION(x, y)	(((x) << 8) | (y))
@@ -52,6 +55,11 @@
 #define OMAP_UART_REV_52 0x0502
 #define OMAP_UART_REV_63 0x0603
 
+#define OMAP_UART_TX_WAKEUP_EN		BIT(7)
+
+/* Feature flags */
+#define OMAP_UART_WER_HAS_TX_WAKEUP	BIT(0)
+
 #define UART_ERRATA_i202_MDR1_ACCESS	BIT(0)
 #define UART_ERRATA_i291_DMA_FORCEIDLE	BIT(1)
 
@@ -127,6 +135,7 @@ struct uart_omap_port {
 	struct uart_port	port;
 	struct uart_omap_dma	uart_dma;
 	struct device		*dev;
+	int			wakeirq;
 
 	unsigned char		ier;
 	unsigned char		lcr;
@@ -137,6 +146,7 @@ struct uart_omap_port {
 	unsigned char		dlh;
 	unsigned char		mdr1;
 	unsigned char		scr;
+	unsigned char		wer;
 
 	int			use_dma;
 	/*
@@ -151,27 +161,25 @@ struct uart_omap_port {
 	int			context_loss_cnt;
 	u32			errata;
 	u8			wakeups_enabled;
+	u32			features;
 
-	int			DTR_gpio;
-	int			DTR_inverted;
-	int			DTR_active;
+	struct serial_rs485	rs485;
+	int			rts_gpio;
 
 	struct pm_qos_request	pm_qos_request;
 	u32			latency;
 	u32			calc_latency;
 	struct work_struct	qos_work;
-	struct pinctrl		*pins;
+	bool			is_suspending;
 };
 
-#define to_uart_omap_port(p)	((container_of((p), struct uart_omap_port, port)))
+#define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
 
 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 
 /* Forward declaration of functions */
 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
 
-static struct workqueue_struct *serial_omap_uart_wq;
-
 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
 {
 	offset <<= up->port.regshift;
@@ -194,17 +202,35 @@ static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
 
 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
 {
-	struct omap_uart_port_info *pdata = up->dev->platform_data;
+	struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
 
 	if (!pdata || !pdata->get_context_loss_count)
-		return 0;
+		return -EINVAL;
 
 	return pdata->get_context_loss_count(up->dev);
 }
 
+static inline void serial_omap_enable_wakeirq(struct uart_omap_port *up,
+				       bool enable)
+{
+	if (!up->wakeirq)
+		return;
+
+	if (enable)
+		enable_irq(up->wakeirq);
+	else
+		disable_irq_nosync(up->wakeirq);
+}
+
 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
 {
-	struct omap_uart_port_info *pdata = up->dev->platform_data;
+	struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
+
+	if (enable == up->wakeups_enabled)
+		return;
+
+	serial_omap_enable_wakeirq(up, enable);
+	up->wakeups_enabled = enable;
 
 	if (!pdata || !pdata->enable_wakeup)
 		return;
@@ -230,12 +256,12 @@ serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
 	unsigned int n16 = port->uartclk / (16 * baud);
 	int baudAbsDiff13 = baud - (port->uartclk / (13 * n13));
 	int baudAbsDiff16 = baud - (port->uartclk / (16 * n16));
-	if(baudAbsDiff13 < 0)
+	if (baudAbsDiff13 < 0)
 		baudAbsDiff13 = -baudAbsDiff13;
-	if(baudAbsDiff16 < 0)
+	if (baudAbsDiff16 < 0)
 		baudAbsDiff16 = -baudAbsDiff16;
 
-	return (baudAbsDiff13 > baudAbsDiff16);
+	return (baudAbsDiff13 >= baudAbsDiff16);
 }
 
 /*
@@ -246,13 +272,13 @@ serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
 static unsigned int
 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
 {
-	unsigned int divisor;
+	unsigned int mode;
 
 	if (!serial_omap_baud_is_mode16(port, baud))
-		divisor = 13;
+		mode = 13;
 	else
-		divisor = 16;
-	return port->uartclk/(baud * divisor);
+		mode = 16;
+	return port->uartclk/(mode * baud);
 }
 
 static void serial_omap_enable_ms(struct uart_port *port)
@@ -271,13 +297,61 @@ static void serial_omap_enable_ms(struct uart_port *port)
 static void serial_omap_stop_tx(struct uart_port *port)
 {
 	struct uart_omap_port *up = to_uart_omap_port(port);
+	int res;
 
 	pm_runtime_get_sync(up->dev);
+
+	/* Handle RS-485 */
+	if (up->rs485.flags & SER_RS485_ENABLED) {
+		if (up->scr & OMAP_UART_SCR_TX_EMPTY) {
+			/* THR interrupt is fired when both TX FIFO and TX
+			 * shift register are empty. This means there's nothing
+			 * left to transmit now, so make sure the THR interrupt
+			 * is fired when TX FIFO is below the trigger level,
+			 * disable THR interrupts and toggle the RS-485 GPIO
+			 * data direction pin if needed.
+			 */
+			up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
+			serial_out(up, UART_OMAP_SCR, up->scr);
+			res = (up->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 1 : 0;
+			if (gpio_get_value(up->rts_gpio) != res) {
+				if (up->rs485.delay_rts_after_send > 0)
+					mdelay(up->rs485.delay_rts_after_send);
+				gpio_set_value(up->rts_gpio, res);
+			}
+		} else {
+			/* We're asked to stop, but there's still stuff in the
+			 * UART FIFO, so make sure the THR interrupt is fired
+			 * when both TX FIFO and TX shift register are empty.
+			 * The next THR interrupt (if no transmission is started
+			 * in the meantime) will indicate the end of a
+			 * transmission. Therefore we _don't_ disable THR
+			 * interrupts in this situation.
+			 */
+			up->scr |= OMAP_UART_SCR_TX_EMPTY;
+			serial_out(up, UART_OMAP_SCR, up->scr);
+			return;
+		}
+	}
+
 	if (up->ier & UART_IER_THRI) {
 		up->ier &= ~UART_IER_THRI;
 		serial_out(up, UART_IER, up->ier);
 	}
 
+	if ((up->rs485.flags & SER_RS485_ENABLED) &&
+	    !(up->rs485.flags & SER_RS485_RX_DURING_TX)) {
+		/*
+		 * Empty the RX FIFO, we are not interested in anything
+		 * received during the half-duplex transmission.
+		 */
+		serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_RCVR);
+		/* Re-enable RX interrupts */
+		up->ier |= UART_IER_RLSI | UART_IER_RDI;
+		up->port.read_status_mask |= UART_LSR_DR;
+		serial_out(up, UART_IER, up->ier);
+	}
+
 	pm_runtime_mark_last_busy(up->dev);
 	pm_runtime_put_autosuspend(up->dev);
 }
@@ -287,7 +361,7 @@ static void serial_omap_stop_rx(struct uart_port *port)
 	struct uart_omap_port *up = to_uart_omap_port(port);
 
 	pm_runtime_get_sync(up->dev);
-	up->ier &= ~UART_IER_RLSI;
+	up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
 	up->port.read_status_mask &= ~UART_LSR_DR;
 	serial_out(up, UART_IER, up->ier);
 	pm_runtime_mark_last_busy(up->dev);
@@ -318,11 +392,8 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
 			break;
 	} while (--count > 0);
 
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
-		spin_unlock(&up->port.lock);
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(&up->port);
-		spin_lock(&up->port.lock);
-	}
 
 	if (uart_circ_empty(xmit))
 		serial_omap_stop_tx(&up->port);
@@ -339,8 +410,29 @@ static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
 static void serial_omap_start_tx(struct uart_port *port)
 {
 	struct uart_omap_port *up = to_uart_omap_port(port);
+	int res;
 
 	pm_runtime_get_sync(up->dev);
+
+	/* Handle RS-485 */
+	if (up->rs485.flags & SER_RS485_ENABLED) {
+		/* Fire THR interrupts when FIFO is below trigger level */
+		up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
+		serial_out(up, UART_OMAP_SCR, up->scr);
+
+		/* if rts not already enabled */
+		res = (up->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
+		if (gpio_get_value(up->rts_gpio) != res) {
+			gpio_set_value(up->rts_gpio, res);
+			if (up->rs485.delay_rts_before_send > 0)
+				mdelay(up->rs485.delay_rts_before_send);
+		}
+	}
+
+	if ((up->rs485.flags & SER_RS485_ENABLED) &&
+	    !(up->rs485.flags & SER_RS485_RX_DURING_TX))
+		serial_omap_stop_rx(port);
+
 	serial_omap_enable_ier_thri(up);
 	pm_runtime_mark_last_busy(up->dev);
 	pm_runtime_put_autosuspend(up->dev);
@@ -596,16 +688,6 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	serial_out(up, UART_MCR, up->mcr);
 	pm_runtime_mark_last_busy(up->dev);
 	pm_runtime_put_autosuspend(up->dev);
-
-	if (gpio_is_valid(up->DTR_gpio) &&
-	    !!(mctrl & TIOCM_DTR) != up->DTR_active) {
-		up->DTR_active = !up->DTR_active;
-		if (gpio_cansleep(up->DTR_gpio))
-			schedule_work(&up->qos_work);
-		else
-			gpio_set_value(up->DTR_gpio,
-				       up->DTR_active != up->DTR_inverted);
-	}
 }
 
 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
@@ -640,6 +722,17 @@ static int serial_omap_startup(struct uart_port *port)
 	if (retval)
 		return retval;
 
+	/* Optional wake-up IRQ */
+	if (up->wakeirq) {
+		retval = request_irq(up->wakeirq, serial_omap_irq,
+				     up->port.irqflags, up->name, up);
+		if (retval) {
+			free_irq(up->port.irq, up);
+			return retval;
+		}
+		disable_irq(up->wakeirq);
+	}
+
 	dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
 
 	pm_runtime_get_sync(up->dev);
@@ -682,7 +775,11 @@ static int serial_omap_startup(struct uart_port *port)
 	serial_out(up, UART_IER, up->ier);
 
 	/* Enable module level wake up */
-	serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
+	up->wer = OMAP_UART_WER_MOD_WKUP;
+	if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP)
+		up->wer |= OMAP_UART_TX_WAKEUP_EN;
+
+	serial_out(up, UART_OMAP_WER, up->wer);
 
 	pm_runtime_mark_last_busy(up->dev);
 	pm_runtime_put_autosuspend(up->dev);
@@ -724,6 +821,8 @@ static void serial_omap_shutdown(struct uart_port *port)
 	pm_runtime_mark_last_busy(up->dev);
 	pm_runtime_put_autosuspend(up->dev);
 	free_irq(up->port.irq, up);
+	if (up->wakeirq)
+		free_irq(up->wakeirq, up);
 }
 
 static void serial_omap_uart_qos_work(struct work_struct *work)
@@ -732,9 +831,6 @@ static void serial_omap_uart_qos_work(struct work_struct *work)
 						qos_work);
 
 	pm_qos_update_request(&up->pm_qos_request, up->latency);
-	if (gpio_is_valid(up->DTR_gpio))
-		gpio_set_value_cansleep(up->DTR_gpio,
-					up->DTR_active != up->DTR_inverted);
 }
 
 static void
@@ -875,7 +971,7 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 	 */
 
 	/* Set receive FIFO threshold to 16 characters and
-	 * transmit FIFO threshold to 16 spaces
+	 * transmit FIFO threshold to 32 spaces
 	 */
 	up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
 	up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
@@ -997,15 +1093,6 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 	dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
 }
 
-static int serial_omap_set_wake(struct uart_port *port, unsigned int state)
-{
-	struct uart_omap_port *up = to_uart_omap_port(port);
-
-	serial_omap_enable_wakeup(up, state);
-
-	return 0;
-}
-
 static void
 serial_omap_pm(struct uart_port *port, unsigned int state,
 	       unsigned int oldstate)
@@ -1253,6 +1340,85 @@ static inline void serial_omap_add_console_port(struct uart_omap_port *up)
 
 #endif
 
+/* Enable or disable the rs485 support */
+static void
+serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
+{
+	struct uart_omap_port *up = to_uart_omap_port(port);
+	unsigned long flags;
+	unsigned int mode;
+	int val;
+
+	pm_runtime_get_sync(up->dev);
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	/* Disable interrupts from this port */
+	mode = up->ier;
+	up->ier = 0;
+	serial_out(up, UART_IER, 0);
+
+	/* store new config */
+	up->rs485 = *rs485conf;
+
+	/*
+	 * Just as a precaution, only allow rs485
+	 * to be enabled if the gpio pin is valid
+	 */
+	if (gpio_is_valid(up->rts_gpio)) {
+		/* enable / disable rts */
+		val = (up->rs485.flags & SER_RS485_ENABLED) ?
+			SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
+		val = (up->rs485.flags & val) ? 1 : 0;
+		gpio_set_value(up->rts_gpio, val);
+	} else
+		up->rs485.flags &= ~SER_RS485_ENABLED;
+
+	/* Enable interrupts */
+	up->ier = mode;
+	serial_out(up, UART_IER, up->ier);
+
+	/* If RS-485 is disabled, make sure the THR interrupt is fired when
+	 * TX FIFO is below the trigger level.
+	 */
+	if (!(up->rs485.flags & SER_RS485_ENABLED) &&
+	    (up->scr & OMAP_UART_SCR_TX_EMPTY)) {
+		up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
+		serial_out(up, UART_OMAP_SCR, up->scr);
+	}
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+	pm_runtime_mark_last_busy(up->dev);
+	pm_runtime_put_autosuspend(up->dev);
+}
+
+static int
+serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
+{
+	struct serial_rs485 rs485conf;
+
+	switch (cmd) {
+	case TIOCSRS485:
+		if (copy_from_user(&rs485conf, (void __user *) arg,
+					sizeof(rs485conf)))
+			return -EFAULT;
+
+		serial_omap_config_rs485(port, &rs485conf);
+		break;
+
+	case TIOCGRS485:
+		if (copy_to_user((void __user *) arg,
+					&(to_uart_omap_port(port)->rs485),
+					sizeof(rs485conf)))
+			return -EFAULT;
+		break;
+
+	default:
+		return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+
 static struct uart_ops serial_omap_pops = {
 	.tx_empty	= serial_omap_tx_empty,
 	.set_mctrl	= serial_omap_set_mctrl,
@@ -1268,12 +1434,12 @@ static struct uart_ops serial_omap_pops = {
 	.shutdown	= serial_omap_shutdown,
 	.set_termios	= serial_omap_set_termios,
 	.pm		= serial_omap_pm,
-	.set_wake	= serial_omap_set_wake,
 	.type		= serial_omap_type,
 	.release_port	= serial_omap_release_port,
 	.request_port	= serial_omap_request_port,
 	.config_port	= serial_omap_config_port,
 	.verify_port	= serial_omap_verify_port,
+	.ioctl		= serial_omap_ioctl,
 #ifdef CONFIG_CONSOLE_POLL
 	.poll_put_char  = serial_omap_poll_put_char,
 	.poll_get_char  = serial_omap_poll_get_char,
@@ -1289,6 +1455,22 @@ static struct uart_driver serial_omap_reg = {
 };
 
 #ifdef CONFIG_PM_SLEEP
+static int serial_omap_prepare(struct device *dev)
+{
+	struct uart_omap_port *up = dev_get_drvdata(dev);
+
+	up->is_suspending = true;
+
+	return 0;
+}
+
+static void serial_omap_complete(struct device *dev)
+{
+	struct uart_omap_port *up = dev_get_drvdata(dev);
+
+	up->is_suspending = false;
+}
+
 static int serial_omap_suspend(struct device *dev)
 {
 	struct uart_omap_port *up = dev_get_drvdata(dev);
@@ -1296,6 +1478,11 @@ static int serial_omap_suspend(struct device *dev)
 	uart_suspend_port(&serial_omap_reg, &up->port);
 	flush_work(&up->qos_work);
 
+	if (device_may_wakeup(dev))
+		serial_omap_enable_wakeup(up, true);
+	else
+		serial_omap_enable_wakeup(up, false);
+
 	return 0;
 }
 
@@ -1303,18 +1490,24 @@ static int serial_omap_resume(struct device *dev)
 {
 	struct uart_omap_port *up = dev_get_drvdata(dev);
 
+	if (device_may_wakeup(dev))
+		serial_omap_enable_wakeup(up, false);
+
 	uart_resume_port(&serial_omap_reg, &up->port);
 
 	return 0;
 }
-#endif
+#else
+#define serial_omap_prepare NULL
+#define serial_omap_complete NULL
+#endif /* CONFIG_PM_SLEEP */
 
 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
 {
 	u32 mvr, scheme;
 	u16 revision, major, minor;
 
-	mvr = serial_in(up, UART_OMAP_MVER);
+	mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
 
 	/* Check revision register scheme */
 	scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
@@ -1353,9 +1546,11 @@ static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
 	case OMAP_UART_REV_52:
 		up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
 				UART_ERRATA_i291_DMA_FORCEIDLE);
+		up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
 		break;
 	case OMAP_UART_REV_63:
 		up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
+		up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
 		break;
 	default:
 		break;
@@ -1375,62 +1570,98 @@ static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
 	return omap_up_info;
 }
 
-static int serial_omap_probe(struct platform_device *pdev)
+static int serial_omap_probe_rs485(struct uart_omap_port *up,
+				   struct device_node *np)
 {
-	struct uart_omap_port	*up;
-	struct resource		*mem, *irq;
-	struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
+	struct serial_rs485 *rs485conf = &up->rs485;
+	u32 rs485_delay[2];
+	enum of_gpio_flags flags;
 	int ret;
 
-	if (pdev->dev.of_node)
-		omap_up_info = of_get_uart_port_info(&pdev->dev);
+	rs485conf->flags = 0;
+	up->rts_gpio = -EINVAL;
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!mem) {
-		dev_err(&pdev->dev, "no mem resource?\n");
-		return -ENODEV;
-	}
-
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!irq) {
-		dev_err(&pdev->dev, "no irq resource?\n");
-		return -ENODEV;
-	}
+	if (!np)
+		return 0;
 
-	if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
-				pdev->dev.driver->name)) {
-		dev_err(&pdev->dev, "memory region already claimed\n");
-		return -EBUSY;
-	}
+	if (of_property_read_bool(np, "rs485-rts-active-high"))
+		rs485conf->flags |= SER_RS485_RTS_ON_SEND;
+	else
+		rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
 
-	if (gpio_is_valid(omap_up_info->DTR_gpio) &&
-	    omap_up_info->DTR_present) {
-		ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
+	/* check for tx enable gpio */
+	up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
+	if (gpio_is_valid(up->rts_gpio)) {
+		ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
 		if (ret < 0)
 			return ret;
-		ret = gpio_direction_output(omap_up_info->DTR_gpio,
-					    omap_up_info->DTR_inverted);
+		ret = gpio_direction_output(up->rts_gpio,
+					    flags & SER_RS485_RTS_AFTER_SEND);
 		if (ret < 0)
 			return ret;
+	} else if (up->rts_gpio == -EPROBE_DEFER) {
+		return -EPROBE_DEFER;
+	} else {
+		up->rts_gpio = -EINVAL;
+	}
+
+	if (of_property_read_u32_array(np, "rs485-rts-delay",
+				    rs485_delay, 2) == 0) {
+		rs485conf->delay_rts_before_send = rs485_delay[0];
+		rs485conf->delay_rts_after_send = rs485_delay[1];
+	}
+
+	if (of_property_read_bool(np, "rs485-rx-during-tx"))
+		rs485conf->flags |= SER_RS485_RX_DURING_TX;
+
+	if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time"))
+		rs485conf->flags |= SER_RS485_ENABLED;
+
+	return 0;
+}
+
+static int serial_omap_probe(struct platform_device *pdev)
+{
+	struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
+	struct uart_omap_port *up;
+	struct resource *mem;
+	void __iomem *base;
+	int uartirq = 0;
+	int wakeirq = 0;
+	int ret;
+
+	/* The optional wakeirq may be specified in the board dts file */
+	if (pdev->dev.of_node) {
+		uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+		if (!uartirq)
+			return -EPROBE_DEFER;
+		wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1);
+		omap_up_info = of_get_uart_port_info(&pdev->dev);
+		pdev->dev.platform_data = omap_up_info;
+	} else {
+		uartirq = platform_get_irq(pdev, 0);
+		if (uartirq < 0)
+			return -EPROBE_DEFER;
 	}
 
 	up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
 	if (!up)
 		return -ENOMEM;
 
-	if (gpio_is_valid(omap_up_info->DTR_gpio) &&
-	    omap_up_info->DTR_present) {
-		up->DTR_gpio = omap_up_info->DTR_gpio;
-		up->DTR_inverted = omap_up_info->DTR_inverted;
-	} else
-		up->DTR_gpio = -EINVAL;
-	up->DTR_active = 0;
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, mem);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
 	up->dev = &pdev->dev;
 	up->port.dev = &pdev->dev;
 	up->port.type = PORT_OMAP;
 	up->port.iotype = UPIO_MEM;
-	up->port.irq = irq->start;
+	up->port.irq = uartirq;
+	up->wakeirq = wakeirq;
+	if (!up->wakeirq)
+		dev_info(up->port.dev, "no wakeirq for uart%d\n",
+			 up->port.line);
 
 	up->port.regshift = 2;
 	up->port.fifosize = 64;
@@ -1448,45 +1679,40 @@ static int serial_omap_probe(struct platform_device *pdev)
 		goto err_port_line;
 	}
 
-	up->pins = devm_pinctrl_get_select_default(&pdev->dev);
-	if (IS_ERR(up->pins)) {
-		dev_warn(&pdev->dev, "did not get pins for uart%i error: %li\n",
-			 up->port.line, PTR_ERR(up->pins));
-		up->pins = NULL;
-	}
+	ret = serial_omap_probe_rs485(up, pdev->dev.of_node);
+	if (ret < 0)
+		goto err_rs485;
 
 	sprintf(up->name, "OMAP UART%d", up->port.line);
 	up->port.mapbase = mem->start;
-	up->port.membase = devm_ioremap(&pdev->dev, mem->start,
-						resource_size(mem));
-	if (!up->port.membase) {
-		dev_err(&pdev->dev, "can't ioremap UART\n");
-		ret = -ENOMEM;
-		goto err_ioremap;
-	}
-
+	up->port.membase = base;
 	up->port.flags = omap_up_info->flags;
 	up->port.uartclk = omap_up_info->uartclk;
 	if (!up->port.uartclk) {
 		up->port.uartclk = DEFAULT_CLK_SPEED;
-		dev_warn(&pdev->dev, "No clock speed specified: using default:"
-						"%d\n", DEFAULT_CLK_SPEED);
+		dev_warn(&pdev->dev,
+			 "No clock speed specified: using default: %d\n",
+			 DEFAULT_CLK_SPEED);
 	}
 
 	up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
 	up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
 	pm_qos_add_request(&up->pm_qos_request,
 		PM_QOS_CPU_DMA_LATENCY, up->latency);
-	serial_omap_uart_wq = create_singlethread_workqueue(up->name);
 	INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
 
 	platform_set_drvdata(pdev, up);
-	pm_runtime_enable(&pdev->dev);
+	if (omap_up_info->autosuspend_timeout == 0)
+		omap_up_info->autosuspend_timeout = -1;
+
+	device_init_wakeup(up->dev, true);
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_set_autosuspend_delay(&pdev->dev,
 			omap_up_info->autosuspend_timeout);
 
 	pm_runtime_irq_safe(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
 	pm_runtime_get_sync(&pdev->dev);
 
 	omap_serial_fill_features_erratas(up);
@@ -1505,7 +1731,7 @@ static int serial_omap_probe(struct platform_device *pdev)
 err_add_port:
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-err_ioremap:
+err_rs485:
 err_port_line:
 	dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
 				pdev->id, __func__, ret);
@@ -1520,6 +1746,7 @@ static int serial_omap_remove(struct platform_device *dev)
 	pm_runtime_disable(up->dev);
 	uart_remove_one_port(&serial_omap_reg, &up->port);
 	pm_qos_remove_request(&up->pm_qos_request);
+	device_init_wakeup(&dev->dev, false);
 
 	return 0;
 }
@@ -1586,32 +1813,29 @@ static void serial_omap_restore_context(struct uart_omap_port *up)
 		serial_omap_mdr1_errataset(up, up->mdr1);
 	else
 		serial_out(up, UART_OMAP_MDR1, up->mdr1);
+	serial_out(up, UART_OMAP_WER, up->wer);
 }
 
 static int serial_omap_runtime_suspend(struct device *dev)
 {
 	struct uart_omap_port *up = dev_get_drvdata(dev);
-	struct omap_uart_port_info *pdata = dev->platform_data;
 
 	if (!up)
 		return -EINVAL;
 
-	if (!pdata)
-		return 0;
+	/*
+	* When using 'no_console_suspend', the console UART must not be
+	* suspended. Since driver suspend is managed by runtime suspend,
+	* preventing runtime suspend (by returning error) will keep device
+	* active during suspend.
+	*/
+	if (up->is_suspending && !console_suspend_enabled &&
+	    uart_console(&up->port))
+		return -EBUSY;
 
 	up->context_loss_cnt = serial_omap_get_context_loss_count(up);
 
-	if (device_may_wakeup(dev)) {
-		if (!up->wakeups_enabled) {
-			serial_omap_enable_wakeup(up, true);
-			up->wakeups_enabled = true;
-		}
-	} else {
-		if (up->wakeups_enabled) {
-			serial_omap_enable_wakeup(up, false);
-			up->wakeups_enabled = false;
-		}
-	}
+	serial_omap_enable_wakeup(up, true);
 
 	up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
 	schedule_work(&up->qos_work);
@@ -1625,8 +1849,10 @@ static int serial_omap_runtime_resume(struct device *dev)
 
 	int loss_cnt = serial_omap_get_context_loss_count(up);
 
+	serial_omap_enable_wakeup(up, false);
+
 	if (loss_cnt < 0) {
-		dev_err(dev, "serial_omap_get_context_loss_count failed : %d\n",
+		dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n",
 			loss_cnt);
 		serial_omap_restore_context(up);
 	} else if (up->context_loss_cnt != loss_cnt) {
@@ -1643,6 +1869,8 @@ static const struct dev_pm_ops serial_omap_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
 	SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
 				serial_omap_runtime_resume, NULL)
+	.prepare        = serial_omap_prepare,
+	.complete       = serial_omap_complete,
 };
 
 #if defined(CONFIG_OF)