[PATCH] tty/serial: add MVF uart driver support

* [PATCH] tty/serial: add MVF uart driver support
@ 2013-04-12  7:10 Jingchang Lu
  2013-04-12 12:30 ` Sascha Hauer
  2013-04-13 20:41 ` Fabio Estevam
  0 siblings, 2 replies; 4+ messages in thread
From: Jingchang Lu @ 2013-04-12  7:10 UTC (permalink / raw)
  To: linux-arm-kernel

It adds Freescale Vybrid Family uart driver support

Signed-off-by: Jingchang Lu <b35083@freescale.com>
---
 drivers/tty/serial/Kconfig       |   17 +
 drivers/tty/serial/Makefile      |    1 +
 drivers/tty/serial/mvf.c         | 1246 ++++++++++++++++++++++++++++++++++++++
 include/uapi/linux/serial_core.h |    3 +
 4 files changed, 1267 insertions(+)
 create mode 100644 drivers/tty/serial/mvf.c

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 7e7006f..ab6dc27 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -574,6 +574,23 @@ config SERIAL_IMX_CONSOLE
 	  your boot loader (lilo or loadlin) about how to pass options to the
 	  kernel at boot time.)
 
+config SERIAL_MVF
+	bool "Freescale Vybrid serial port support"
+	depends on ARCH_MVF
+	select SERIAL_CORE
+	select RATIONAL
+	help
+	  If you have a machine based on a Freescale Vybrid CPU you
+	  can enable its onboard serial port by enabling this option.
+
+config SERIAL_MVF_CONSOLE
+	bool "Console on Vybrid serial port"
+	depends on SERIAL_MVF
+	select SERIAL_CORE_CONSOLE
+	help
+	  If you have enabled the serial port on the Freescale Vybrid family
+	  CPU you can make it the console by answering Y to this option.
+
 config SERIAL_UARTLITE
 	tristate "Xilinx uartlite serial port support"
 	depends on PPC32 || MICROBLAZE || MFD_TIMBERDALE
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index eedfec4..be2ed68 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o
 obj-$(CONFIG_SERIAL_SGI_L1_CONSOLE) += sn_console.o
 obj-$(CONFIG_SERIAL_CPM) += cpm_uart/
 obj-$(CONFIG_SERIAL_IMX) += imx.o
+obj-$(CONFIG_SERIAL_MVF) += mvf.o
 obj-$(CONFIG_SERIAL_MPC52xx) += mpc52xx_uart.o
 obj-$(CONFIG_SERIAL_ICOM) += icom.o
 obj-$(CONFIG_SERIAL_M32R_SIO) += m32r_sio.o
diff --git a/drivers/tty/serial/mvf.c b/drivers/tty/serial/mvf.c
new file mode 100644
index 0000000..b3b7ffd
--- /dev/null
+++ b/drivers/tty/serial/mvf.c
@@ -0,0 +1,1246 @@
+/*
+ *  Driver for Freescale Vybrid Family serial ports
+ *
+ *  Based on drivers/tty/serial/imx.c
+ *
+ *  Copyright 2012-2013 Freescale Semiconductor, Inc.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#if defined(CONFIG_SERIAL_MVF_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/rational.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <linux/platform_data/serial-imx.h>
+#include <linux/platform_data/dma-imx.h>
+
+/* All uart module registers for MVF is 8-bit width */
+#define MXC_UARTBDH		0x00 /* Baud rate reg: high */
+#define MXC_UARTBDL		0x01 /* Baud rate reg: low */
+#define MXC_UARTCR1		0x02 /* Control reg 1 */
+#define MXC_UARTCR2		0x03 /* Control reg 2 */
+#define MXC_UARTSR1		0x04 /* Status reg 1 */
+#define MXC_UARTSR2		0x05 /* Status reg 2 */
+#define MXC_UARTCR3		0x06 /* Control reg 3 */
+#define MXC_UARTDR		0x07 /* Data reg */
+#define MXC_UARTMAR1		0x08 /* Match address reg 1 */
+#define MXC_UARTMAR2		0x09 /* Match address reg 2 */
+#define MXC_UARTCR4		0x0A /* Control reg 4 */
+#define MXC_UARTCR5		0x0B /* Control reg 5 */
+#define MXC_UARTEDR		0x0C /* Extended data reg */
+#define MXC_UARTMODEM		0x0D /* Modem reg */
+#define MXC_UARTIR		0x0E /* Infrared reg */
+#define MXC_UARTPFIFO		0x10 /* FIFO parameter reg */
+#define MXC_UARTCFIFO		0x11 /* FIFO control reg */
+#define MXC_UARTSFIFO		0x12 /* FIFO status reg */
+#define MXC_UARTTWFIFO		0x13 /* FIFO transmit watermark reg */
+#define MXC_UARTTCFIFO		0x14 /* FIFO transmit count reg */
+#define MXC_UARTRWFIFO		0x15 /* FIFO receive watermark reg */
+#define MXC_UARTRCFIFO		0x16 /* FIFO receive count reg */
+#define MXC_UARTC7816		0x18 /* 7816 control reg */
+#define MXC_UARTIE7816		0x19 /* 7816 interrupt enable reg */
+#define MXC_UARTIS7816		0x1A /* 7816 interrupt status reg */
+#define MXC_UARTWP7816T0	0x1B /* 7816 wait parameter reg */
+#define MXC_UARTWP7816T1	0x1B /* 7816 wait parameter reg */
+#define MXC_UARTWN7816		0x1C /* 7816 wait N reg */
+#define MXC_UARTWF7816		0x1D /* 7816 wait FD reg */
+#define MXC_UARTET7816		0x1E /* 7816 error threshold reg */
+#define MXC_UARTTL7816		0x1F /* 7816 transmit length reg */
+#define MXC_UARTCR6		0x21 /* CEA709.1-B contrl reg */
+#define MXC_UARTPCTH		0x22 /* CEA709.1-B packet cycle counter high */
+#define MXC_UARTPCTL		0x23 /* CEA709.1-B packet cycle counter low */
+#define MXC_UARTB1T		0x24 /* CEA709.1-B beta 1 time */
+#define MXC_UARTSDTH		0x25 /* CEA709.1-B secondary delay timer high */
+#define MXC_UARTSDTL		0x26 /* CEA709.1-B secondary delay timer low */
+#define MXC_UARTPRE		0x27 /* CEA709.1-B preamble */
+#define MXC_UARTTPL		0x28 /* CEA709.1-B transmit packet length */
+#define MXC_UARTIE		0x29 /* CEA709.1-B transmit interrupt enable */
+#define MXC_UARTSR3		0x2B /* CEA709.1-B status reg */
+#define MXC_UARTSR4		0x2C /* CEA709.1-B status reg */
+#define MXC_UARTRPL		0x2D /* CEA709.1-B received packet length */
+#define MXC_UARTRPREL		0x2E /* CEA709.1-B received preamble length */
+#define MXC_UARTCPW		0x2F /* CEA709.1-B collision pulse width */
+#define MXC_UARTRIDT		0x30 /* CEA709.1-B receive indeterminate time */
+#define MXC_UARTTIDT		0x31 /* CEA709.1-B transmit indeterminate time*/
+
+/* Bit definations of BDH */
+#define MXC_UARTBDH_LBKDIE	0x80 /* LIN break detect interrupt enable */
+#define MXC_UARTBDH_RXEDGIE	0x40 /* RxD input Active edge interrupt enable*/
+#define MXC_UARTBDH_SBR_MASK	0x1f /* Uart baud rate high 5-bits */
+/* Bit definations of CR1 */
+#define MXC_UARTCR1_LOOPS	0x80 /* Loop mode select */
+#define MXC_UARTCR1_RSRC	0x20 /* Receiver source select */
+#define MXC_UARTCR1_M		0x10 /* 9-bit 8-bit mode select */
+#define MXC_UARTCR1_WAKE	0x08 /* Receiver wakeup method */
+#define MXC_UARTCR1_ILT		0x04 /* Idle line type */
+#define MXC_UARTCR1_PE		0x02 /* Parity enable */
+#define MXC_UARTCR1_PT		0x01 /* Parity type */
+/* Bit definations of CR2 */
+#define MXC_UARTCR2_TIE		0x80 /* Tx interrupt or DMA request enable */
+#define MXC_UARTCR2_TCIE	0x40 /* Transmission complete int enable */
+#define MXC_UARTCR2_RIE		0x20 /* Rx full int or DMA request enable */
+#define MXC_UARTCR2_ILIE	0x10 /* Idle line interrupt enable */
+#define MXC_UARTCR2_TE		0x08 /* Transmitter enable */
+#define MXC_UARTCR2_RE		0x04 /* Receiver enable */
+#define MXC_UARTCR2_RWU		0x02 /* Receiver wakeup control */
+#define MXC_UARTCR2_SBK		0x01 /* Send break */
+/* Bit definations of SR1 */
+#define MXC_UARTSR1_TDRE	0x80 /* Tx data reg empty */
+#define MXC_UARTSR1_TC		0x40 /* Transmit complete */
+#define MXC_UARTSR1_RDRF	0x20 /* Rx data reg full */
+#define MXC_UARTSR1_IDLE	0x10 /* Idle line flag */
+#define MXC_UARTSR1_OR		0x08 /* Receiver overrun */
+#define MXC_UARTSR1_NF		0x04 /* Noise flag */
+#define MXC_UARTSR1_FE		0x02 /* Frame error */
+#define MXC_UARTSR1_PE		0x01 /* Parity error */
+/* Bit definations of SR2 */
+#define MXC_UARTSR2_LBKDIF	0x80 /* LIN brk detect interrupt flag */
+#define MXC_UARTSR2_RXEDGIF	0x40 /* RxD pin active edge interrupt flag */
+#define MXC_UARTSR2_MSBF	0x20 /* MSB first */
+#define MXC_UARTSR2_RXINV	0x10 /* Receive data inverted */
+#define MXC_UARTSR2_RWUID	0x08 /* Receive wakeup idle detect */
+#define MXC_UARTSR2_BRK13	0x04 /* Break transmit character length */
+#define MXC_UARTSR2_LBKDE	0x02 /* LIN break detection enable */
+#define MXC_UARTSR2_RAF		0x01 /* Receiver active flag */
+/* Bit definations of CR3 */
+#define MXC_UARTCR3_R8		0x80 /* Received bit8, for 9-bit data format */
+#define MXC_UARTCR3_T8		0x40 /* transmit bit8, for 9-bit data format */
+#define MXC_UARTCR3_TXDIR	0x20 /* Tx pin direction in single-wire mode */
+#define MXC_UARTCR3_TXINV	0x10 /* Transmit data inversion */
+#define MXC_UARTCR3_ORIE	0x08 /* Overrun error interrupt enable */
+#define MXC_UARTCR3_NEIE	0x04 /* Noise error interrupt enable */
+#define MXC_UARTCR3_FEIE	0x02 /* Framing error interrupt enable */
+#define MXC_UARTCR3_PEIE	0x01 /* Parity errror interrupt enable */
+/* Bit definations of CR4 */
+#define MXC_UARTCR4_MAEN1	0x80 /* Match address mode enable 1 */
+#define MXC_UARTCR4_MAEN2	0x40 /* Match address mode enable 2 */
+#define MXC_UARTCR4_M10		0x20 /* 10-bit mode select */
+#define MXC_UARTCR4_BRFA_MASK	0x1F /* Baud rate fine adjust */
+#define MXC_UARTCR4_BRFA_OFF	0
+/* Bit definations of CR5 */
+#define MXC_UARTCR5_TDMAS	0x80 /* Transmitter DMA select */
+#define MXC_UARTCR5_RDMAS	0x20 /* Receiver DMA select */
+/* Bit definations of Modem */
+#define MXC_UARTMODEM_RXRTSE	0x08 /* Enable receiver request-to-send */
+#define MXC_UARTMODEM_TXRTSPOL	0x04 /* Select transmitter RTS polarity */
+#define MXC_UARTMODEM_TXRTSE	0x02 /* Enable transmitter request-to-send */
+#define MXC_UARTMODEM_TXCTSE	0x01 /* Enable transmitter CTS clear-to-send */
+/* Bit definations of EDR */
+#define MXC_UARTEDR_NOISY	0x80 /* Current dataword received with noise */
+#define MXC_UARTEDR_PARITYE	0x40 /* Dataword received with parity error */
+/* Bit definations of Infrared reg(IR) */
+#define MXC_UARTIR_IREN		0x04 /* Infrared enable */
+#define MXC_UARTIR_TNP_MASK	0x03 /* Transmitter narrow pluse */
+#define MXC_UARTIR_TNP_OFF	0
+/* Bit definations of FIFO parameter reg */
+#define MXC_UARTPFIFO_TXFE	0x80 /* Transmit fifo enable */
+#define MXC_UARTPFIFO_TXFIFOSIZE_MASK	0x7
+#define MXC_UARTPFIFO_TXFIFOSIZE_OFF	4
+#define MXC_UARTPFIFO_RXFE	0x08 /* Receiver fifo enable */
+#define MXC_UARTPFIFO_RXFIFOSIZE_MASK	0x7
+#define MXC_UARTPFIFO_RXFIFOSIZE_OFF	0
+/* Bit definations of FIFO control reg */
+#define MXC_UARTCFIFO_TXFLUSH	0x80 /* Transmit FIFO/buffer flush */
+#define MXC_UARTCFIFO_RXFLUSH	0x40 /* Receive FIFO/buffer flush */
+#define MXC_UARTCFIFO_RXOFE	0x04 /* Receive fifo overflow INT enable */
+#define MXC_UARTCFIFO_TXOFE	0x02 /* Transmit fifo overflow INT enable */
+#define MXC_UARTCFIFO_RXUFE	0x01 /* Receive fifo underflow INT enable */
+/* Bit definations of FIFO status reg */
+#define MXC_UARTSFIFO_TXEMPT	0x80 /* Transmit fifo/buffer empty */
+#define MXC_UARTSFIFO_RXEMPT	0x40 /* Receive fifo/buffer empty */
+#define MXC_UARTSFIFO_RXOF	0x04 /* Rx buffer overflow flag */
+#define MXC_UARTSFIFO_TXOF	0x02 /* Tx buffer overflow flag */
+#define MXC_UARTSFIFO_RXUF	0x01 /* Rx buffer underflow flag */
+
+
+
+#undef CONFIG_MVF_SERIAL_DMA
+/* follow IMX dev node number */
+#define SERIAL_IMX_MAJOR	207
+#define MINOR_START		24
+#define DEV_NAME	"ttymxc"
+#define MAX_INTERNAL_IRQ	MXC_INTERNAL_IRQS
+
+/*
+ * This determines how often we check the modem status signals
+ * for any change.  They generally aren't connected to an IRQ
+ * so we have to poll them.  We also check immediately before
+ * filling the TX fifo incase CTS has been dropped.
+ */
+#define MCTRL_TIMEOUT	(250*HZ/1000)
+
+#define DRIVER_NAME "MVF-uart"
+
+#define UART_NR 6
+
+struct mvf_port {
+	struct uart_port	port;
+	unsigned int		old_status;
+	int			txirq, rxirq, rtsirq;
+	unsigned int		have_rtscts:1;
+	unsigned int		use_dcedte:1;
+	unsigned int		use_irda:1;
+	unsigned int		irda_inv_rx:1;
+	unsigned int		irda_inv_tx:1;
+	unsigned int		fifo_en:1; /* enable FIFO mode */
+	unsigned int		mark_en:1; /* enable Mark address match */
+	unsigned int		format_9bits:1; /* 9bits data format */
+	unsigned short		trcv_delay; /* transceiver delay */
+	unsigned char		ma_addr; /* Match address */
+	struct clk		*clk;
+
+	unsigned int		tx_fifo_size, rx_fifo_size;
+
+	/* DMA fields */
+	int			enable_dma;
+	unsigned long		dma_tx_ch; /* configured eDMA channel */
+	struct imx_dma_data	dma_data;
+	struct dma_chan		*dma_chan_rx, *dma_chan_tx;
+	struct scatterlist	rx_sgl, tx_sgl;
+	void			*rx_buf;
+	unsigned char		*tx_buf;
+	unsigned int		rx_bytes, tx_bytes;
+	struct work_struct	tsk_dma_rx, tsk_dma_tx;
+	unsigned int		dma_tx_nents;
+	bool			dma_is_rxing, dma_is_txing;
+	wait_queue_head_t	dma_wait;
+};
+
+#ifdef CONFIG_IRDA
+#define USE_IRDA(sport)	((sport)->use_irda)
+#else
+#define USE_IRDA(sport)	(0)
+#endif
+enum mvf_uart_type {
+	MVF600_UART,
+};
+
+struct mvf_uart_data {
+	unsigned uts_reg;
+	enum mvf_uart_type devtype;
+};
+
+static struct mvf_uart_data mvf_uart_devdata[] = {
+	[MVF600_UART] = {
+		.devtype = MVF600_UART,
+	},
+};
+
+static struct platform_device_id mvf_uart_devtype[] = {
+	{
+		.name = "mvf600-uart",
+		.driver_data = (kernel_ulong_t) &mvf_uart_devdata[MVF600_UART],
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(platform, mvf_uart_devtype);
+
+static struct of_device_id mvf_uart_dt_ids[] = {
+	{
+		.compatible = "fsl,mvf-uart",
+		.data = &mvf_uart_devdata[MVF600_UART],
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mvf_uart_dt_ids);
+
+/*
+ * interrupts disabled on entry
+ */
+static void mvf_stop_tx(struct uart_port *port)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	unsigned char temp;
+
+	temp = readb(sport->port.membase + MXC_UARTCR2);
+	writeb(temp & ~(MXC_UARTCR2_TIE | MXC_UARTCR2_TCIE),
+			sport->port.membase + MXC_UARTCR2);
+}
+
+/*
+ * interrupts disabled on entry
+ */
+static void mvf_stop_rx(struct uart_port *port)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	unsigned char temp;
+
+	/* if the DMA RX thread is running, wait for it to finish. */
+	if (sport->enable_dma && sport->dma_is_rxing)
+		return;
+
+	temp = readb(sport->port.membase + MXC_UARTCR2);
+	writeb(temp & ~MXC_UARTCR2_RE, sport->port.membase + MXC_UARTCR2);
+}
+
+ /* modem status update function */
+static void mvf_enable_ms(struct uart_port *port)
+{
+}
+
+static inline void mvf_transmit_buffer(struct mvf_port *sport)
+{
+	struct circ_buf *xmit = &sport->port.state->xmit;
+
+	while (!uart_circ_empty(xmit) && (sport->fifo_en == 1 ?
+	(readb(sport->port.membase + MXC_UARTTCFIFO) < sport->tx_fifo_size) :
+		(readb(sport->port.membase + MXC_UARTSR1) & MXC_UARTSR1_TDRE)
+		)) {
+		/* send out xmit->buf[xmit->tail] */
+		writeb(xmit->buf[xmit->tail], sport->port.membase + MXC_UARTDR);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		sport->port.icount.tx++;
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&sport->port);
+
+	if (uart_circ_empty(xmit))
+		mvf_stop_tx(&sport->port);
+}
+
+/*
+ * interrupts disabled on entry
+ */
+static void mvf_start_tx(struct uart_port *port)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	unsigned char temp;
+
+	if (!sport->enable_dma) {
+		temp = readb(sport->port.membase + MXC_UARTCR2);
+		writeb(temp | MXC_UARTCR2_TIE,
+				sport->port.membase + MXC_UARTCR2);
+	}
+
+	if (sport->enable_dma) {
+		schedule_work(&sport->tsk_dma_tx);
+		return;
+	}
+
+	if (readb(sport->port.membase + MXC_UARTSR1) & MXC_UARTSR1_TDRE)
+		mvf_transmit_buffer(sport);
+}
+
+
+static irqreturn_t mvf_txint(int irq, void *dev_id)
+{
+	struct mvf_port *sport = dev_id;
+	struct circ_buf *xmit = &sport->port.state->xmit;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+	if (sport->port.x_char) {
+		/* Send next char */
+		writeb(sport->port.x_char, sport->port.membase + MXC_UARTDR);
+		goto out;
+	}
+
+	if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
+		mvf_stop_tx(&sport->port);
+		goto out;
+	}
+
+	mvf_transmit_buffer(sport);
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&sport->port);
+
+out:
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mvf_rxint(int irq, void *dev_id)
+{
+	struct mvf_port *sport = dev_id;
+	unsigned int flg, ignored = 0;
+	struct tty_port *port = &sport->port.state->port;
+	unsigned long flags;
+	unsigned char r8, rx, sr;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+
+	while (!(readb(sport->port.membase + MXC_UARTSFIFO) &
+				MXC_UARTSFIFO_RXEMPT)) {
+		flg = TTY_NORMAL;
+		sport->port.icount.rx++;
+
+		/*  To clear the FE, OR, NF, FE, PE flags when set,
+		 *  read SR1 then read DR
+		 */
+		sr = readb(sport->port.membase + MXC_UARTSR1);
+
+		r8 = readb(sport->port.membase + MXC_UARTCR3) & MXC_UARTCR3_R8;
+		rx = readb(sport->port.membase + MXC_UARTDR);
+
+		if (sport->mark_en &&
+			(sport->format_9bits ? r8 : (rx == sport->ma_addr)))
+				continue;
+
+		if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
+			continue;
+		if (sr & (MXC_UARTSR1_PE | MXC_UARTSR1_OR | MXC_UARTSR1_FE)) {
+			if (sr & MXC_UARTSR1_PE)
+				sport->port.icount.parity++;
+			else if (sr & MXC_UARTSR1_FE)
+				sport->port.icount.frame++;
+			if (sr & MXC_UARTSR1_OR)
+				sport->port.icount.overrun++;
+
+			if (sr & sport->port.ignore_status_mask) {
+				if (++ignored > 100)
+					goto out;
+				continue;
+			}
+
+			sr &= sport->port.read_status_mask;
+
+			if (sr & MXC_UARTSR1_PE)
+				flg = TTY_PARITY;
+			else if (sr & MXC_UARTSR1_FE)
+				flg = TTY_FRAME;
+			if (sr & MXC_UARTSR1_OR)
+				flg = TTY_OVERRUN;
+
+#ifdef SUPPORT_SYSRQ
+			sport->port.sysrq = 0;
+#endif
+		}
+
+		tty_insert_flip_char(port, rx, flg);
+	}
+
+out:
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+
+	tty_flip_buffer_push(port);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mvf_int(int irq, void *dev_id)
+{
+	struct mvf_port *sport = dev_id;
+	unsigned int sts;
+
+	sts = readb(sport->port.membase + MXC_UARTSR1);
+
+	if (sts & MXC_UARTSR1_RDRF)
+			mvf_rxint(irq, dev_id);
+
+	if (sts & MXC_UARTSR1_TDRE &&
+		!(readb(sport->port.membase + MXC_UARTCR5) &
+			MXC_UARTCR5_TDMAS))
+		mvf_txint(irq, dev_id);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Return TIOCSER_TEMT when transmitter is not busy.
+ */
+static unsigned int mvf_tx_empty(struct uart_port *port)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+
+	return (readb(sport->port.membase + MXC_UARTSR1) & MXC_UARTSR1_TC) ?
+		TIOCSER_TEMT : 0;
+}
+
+static unsigned int mvf_get_mctrl(struct uart_port *port)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	unsigned int tmp = 0;
+	unsigned char reg;
+
+	reg = readb(sport->port.membase + MXC_UARTMODEM);
+	if (reg & MXC_UARTMODEM_TXCTSE)
+		tmp |= TIOCM_CTS;
+
+	if (reg & MXC_UARTMODEM_RXRTSE)
+		tmp |= TIOCM_RTS;
+
+	return tmp;
+}
+
+static void mvf_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	unsigned long temp;
+
+	temp = readb(sport->port.membase + MXC_UARTMODEM) &
+			~(MXC_UARTMODEM_RXRTSE | MXC_UARTMODEM_TXCTSE);
+
+	if (mctrl & TIOCM_RTS)
+		temp |= MXC_UARTMODEM_RXRTSE;
+	if (mctrl & TIOCM_CTS)
+		temp |= MXC_UARTMODEM_TXCTSE;
+
+	writeb(temp, sport->port.membase + MXC_UARTMODEM);
+}
+
+/*
+ * Interrupts always disabled.
+ */
+static void mvf_break_ctl(struct uart_port *port, int break_state)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	unsigned long flags;
+	unsigned char temp;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+
+	temp = readb(sport->port.membase + MXC_UARTCR2) & ~MXC_UARTCR2_SBK;
+
+	if (break_state != 0)
+		temp |= MXC_UARTCR2_SBK;
+
+	writeb(temp, sport->port.membase + MXC_UARTCR2);
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+#define TXTL 2
+#define RXTL 1
+
+static int mvf_setup_watermark(struct mvf_port *sport, unsigned int mode)
+{
+	unsigned char val, old_cr2, cr2;
+
+	/* set receiver/transmitter trigger level. */
+	old_cr2 = cr2 = readb(sport->port.membase + MXC_UARTCR2);
+	cr2 &= ~(MXC_UARTCR2_TIE | MXC_UARTCR2_TCIE | MXC_UARTCR2_TE |
+			MXC_UARTCR2_RIE | MXC_UARTCR2_RE);
+	writeb(cr2, sport->port.membase + MXC_UARTCR2);
+
+	val = TXTL;
+	writeb(val, sport->port.membase + MXC_UARTTWFIFO);
+	val = RXTL;
+	writeb(val, sport->port.membase + MXC_UARTRWFIFO);
+
+	/* Enable Tx and Rx FIFO */
+	val = readb(sport->port.membase + MXC_UARTPFIFO);
+	sport->tx_fifo_size = 0x1 << (((val >> MXC_UARTPFIFO_TXFIFOSIZE_OFF) &
+		MXC_UARTPFIFO_TXFIFOSIZE_MASK) + 1);
+	sport->rx_fifo_size = 0x1 << (((val >> MXC_UARTPFIFO_RXFIFOSIZE_OFF) &
+		MXC_UARTPFIFO_RXFIFOSIZE_MASK) + 1);
+	writeb(val | MXC_UARTPFIFO_TXFE | MXC_UARTPFIFO_RXFE,
+			sport->port.membase + MXC_UARTPFIFO);
+
+	/* Flush the Tx and Rx FIFO to a known state */
+	writeb(MXC_UARTCFIFO_TXFLUSH | MXC_UARTCFIFO_RXFLUSH,
+			sport->port.membase + MXC_UARTCFIFO);
+
+	/* restore CR2 */
+	writeb(old_cr2, sport->port.membase + MXC_UARTCR2);
+
+	return 0;
+}
+
+
+static int mvf_startup(struct uart_port *port)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	int retval;
+	unsigned long flags, temp;
+
+	if (sport->fifo_en)
+		mvf_setup_watermark(sport, 0);
+
+	temp = readb(sport->port.membase + MXC_UARTCR2);
+
+	writeb(temp & ~MXC_UARTCR2_RIE, sport->port.membase + MXC_UARTCR2);
+
+	/*
+	 * Allocate the IRQ(s)
+	 * Vybrid chips only have one interrupt.
+	 */
+	retval = request_irq(sport->port.irq, mvf_int, 0,
+				DRIVER_NAME, sport);
+	if (retval)
+		goto error_out1;
+
+	/* Enable the DMA ops for uart. */
+	if (sport->enable_dma) {
+		sport->dma_is_txing = 0;
+
+		/* enable DMA request generation */
+		temp = readb(sport->port.membase + MXC_UARTCR5);
+		temp |= MXC_UARTCR5_TDMAS;
+		writeb(temp, sport->port.membase + MXC_UARTCR5);
+
+		init_waitqueue_head(&sport->dma_wait);
+	}
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+
+	/* Finally, clear and enable interrupts */
+	temp = readb(sport->port.membase + MXC_UARTCR2);
+	temp |= MXC_UARTCR2_RIE | MXC_UARTCR2_TIE;
+	writeb(temp, sport->port.membase + MXC_UARTCR2);
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+
+	return 0;
+
+error_out1:
+	return retval;
+}
+
+static void mvf_shutdown(struct uart_port *port)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	unsigned char temp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+	temp = readb(sport->port.membase + MXC_UARTCR2);
+	temp &= ~(MXC_UARTCR2_TE | MXC_UARTCR2_RE);
+	writeb(temp, sport->port.membase + MXC_UARTCR2);
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+
+	/*
+	 * Free the interrupts
+	 */
+	if (sport->txirq > 0) {
+		if (!USE_IRDA(sport))
+			free_irq(sport->rtsirq, sport);
+		free_irq(sport->txirq, sport);
+		free_irq(sport->rxirq, sport);
+	} else
+		free_irq(sport->port.irq, sport);
+
+	/*
+	 * Disable all interrupts, port and break condition.
+	 */
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+	temp = readb(sport->port.membase + MXC_UARTCR2);
+	temp &= ~(MXC_UARTCR2_TIE | MXC_UARTCR2_TCIE | MXC_UARTCR2_RIE);
+	writeb(temp, sport->port.membase + MXC_UARTCR2);
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static void
+mvf_set_termios(struct uart_port *port, struct ktermios *termios,
+		   struct ktermios *old)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	unsigned long flags;
+	unsigned char cr1, old_cr1, old_cr2, cr4, bdh, modem;
+	unsigned int  baud;
+	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
+	unsigned int sbr, brfa;
+
+	cr1 = old_cr1 = readb(sport->port.membase + MXC_UARTCR1);
+	old_cr2 = readb(sport->port.membase + MXC_UARTCR2);
+	cr4 = readb(sport->port.membase + MXC_UARTCR4);
+	bdh = readb(sport->port.membase + MXC_UARTBDH);
+	modem = readb(sport->port.membase + MXC_UARTMODEM);
+	/*
+	 * If we don't support modem control lines, don't allow
+	 * these to be set.
+	 */
+	if (0) {
+		termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
+		termios->c_cflag |= CLOCAL;
+	}
+
+	/*
+	 * We only support CS8 and CS7,but CS7 must enable PE.
+	 * supported mode:
+	 *  - (7,e/o,1)
+	 *  - (8,n,1)
+	 *  - (8,m/s,1)
+	 *  - (8,e/o,1)
+	 */
+	while ((termios->c_cflag & CSIZE) != CS8 &&
+		(termios->c_cflag & CSIZE) != CS7) {
+		termios->c_cflag &= ~CSIZE;
+		termios->c_cflag |= old_csize;
+		old_csize = CS8;
+	}
+
+	if ((termios->c_cflag & CSIZE) == CS8 ||
+		(termios->c_cflag & CSIZE) == CS7)
+		cr1 = old_cr1 & ~MXC_UARTCR1_M;
+
+	if (termios->c_cflag & CMSPAR) {
+		if ((termios->c_cflag & CSIZE) != CS8) {
+			termios->c_cflag &= ~CSIZE;
+			termios->c_cflag |= CS8;
+		}
+		cr1 |= MXC_UARTCR1_M;
+	}
+
+	if (termios->c_cflag & CRTSCTS) {
+		if (sport->have_rtscts)
+			modem |= (MXC_UARTMODEM_RXRTSE | MXC_UARTMODEM_TXCTSE);
+
+	} else {
+		termios->c_cflag &= ~CRTSCTS;
+		modem &= ~(MXC_UARTMODEM_RXRTSE | MXC_UARTMODEM_TXCTSE);
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		termios->c_cflag &= ~CSTOPB;
+
+	/* parity must enable when CS7 to match 8-bits format */
+	if ((termios->c_cflag & CSIZE) == CS7)
+		termios->c_cflag |= PARENB;
+
+	if ((termios->c_cflag & PARENB)) {
+		if (termios->c_cflag & CMSPAR) {
+			cr1 &= ~MXC_UARTCR1_PE;
+			cr1 |= MXC_UARTCR1_M;
+			sport->format_9bits = 1;
+		} else {
+			cr1 |= MXC_UARTCR1_PE;
+			if ((termios->c_cflag & CSIZE) == CS8)
+				cr1 |= MXC_UARTCR1_M;
+			if (termios->c_cflag & PARODD)
+				cr1 |= MXC_UARTCR1_PT;
+			else
+				cr1 &= ~MXC_UARTCR1_PT;
+		}
+	}
+
+	/*
+	 * Ask the core to calculate the divisor for us.
+	 */
+	baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+
+	sport->port.read_status_mask = 0;
+	if (termios->c_iflag & INPCK)
+		sport->port.read_status_mask |=
+					(MXC_UARTSR1_FE | MXC_UARTSR1_PE);
+	if (termios->c_iflag & (BRKINT | PARMRK))
+		sport->port.read_status_mask |= MXC_UARTSR1_FE;
+
+	/*
+	 * Characters to ignore
+	 */
+	sport->port.ignore_status_mask = 0;
+	if (termios->c_iflag & IGNPAR)
+		sport->port.ignore_status_mask |= MXC_UARTSR1_PE;
+	if (termios->c_iflag & IGNBRK) {
+		sport->port.ignore_status_mask |= MXC_UARTSR1_FE;
+		/*
+		 * If we're ignoring parity and break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (termios->c_iflag & IGNPAR)
+			sport->port.ignore_status_mask |= MXC_UARTSR1_OR;
+	}
+
+	/*
+	 * Update the per-port timeout.
+	 */
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	/* wait transmit engin complete */
+	while (!(readb(sport->port.membase + MXC_UARTSR1) & MXC_UARTSR1_TC))
+		barrier();
+
+	writeb(old_cr2 & ~(MXC_UARTCR2_TE | MXC_UARTCR2_RE),
+			sport->port.membase + MXC_UARTCR2);
+
+	/* disable transmit and receive */
+	sbr = sport->port.uartclk / (16 * baud);
+	brfa = ((sport->port.uartclk - (16 * sbr * baud)) * 2)/baud;
+
+	bdh &= ~MXC_UARTBDH_SBR_MASK;
+	bdh |= (sbr >> 8) & 0x1F;
+
+	cr4 &= ~MXC_UARTCR4_BRFA_MASK;
+	brfa &= MXC_UARTCR4_BRFA_MASK;
+	writeb(cr4 | brfa, sport->port.membase + MXC_UARTCR4);
+	writeb(bdh, sport->port.membase + MXC_UARTBDH);
+	writeb(sbr & 0xFF, sport->port.membase + MXC_UARTBDL);
+	writeb(cr1, sport->port.membase + MXC_UARTCR1);
+	writeb(modem, sport->port.membase + MXC_UARTMODEM);
+
+	/* restore control register */
+	writeb(old_cr2, sport->port.membase + MXC_UARTCR2);
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static const char *mvf_type(struct uart_port *port)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+
+	return sport->port.type == PORT_MVF ? "MVF" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void mvf_release_port(struct uart_port *port)
+{
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct resource *mmres;
+
+	mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(mmres->start, mmres->end - mmres->start + 1);
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int mvf_request_port(struct uart_port *port)
+{
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct resource *mmres;
+	void *ret;
+
+	mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mmres)
+		return -ENODEV;
+
+	ret = request_mem_region(mmres->start, mmres->end - mmres->start + 1,
+			"imx-uart");
+
+	return  ret ? 0 : -EBUSY;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void mvf_config_port(struct uart_port *port, int flags)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+
+	if (flags & UART_CONFIG_TYPE &&
+	    mvf_request_port(&sport->port) == 0)
+		sport->port.type = PORT_MVF;
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ * The only change we allow are to the flags and type, and
+ * even then only between PORT_MVF and PORT_UNKNOWN
+ */
+static int
+mvf_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+	int ret = 0;
+
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_MVF)
+		ret = -EINVAL;
+	if (sport->port.irq != ser->irq)
+		ret = -EINVAL;
+	if (ser->io_type != UPIO_MEM)
+		ret = -EINVAL;
+	if (sport->port.uartclk / 16 != ser->baud_base)
+		ret = -EINVAL;
+	if (sport->port.iobase != ser->port)
+		ret = -EINVAL;
+	if (ser->hub6 != 0)
+		ret = -EINVAL;
+	return ret;
+}
+
+
+static struct uart_ops mvf_pops = {
+	.tx_empty	= mvf_tx_empty,
+	.set_mctrl	= mvf_set_mctrl,
+	.get_mctrl	= mvf_get_mctrl,
+	.stop_tx	= mvf_stop_tx,
+	.start_tx	= mvf_start_tx,
+	.stop_rx	= mvf_stop_rx,
+	.enable_ms	= mvf_enable_ms,
+	.break_ctl	= mvf_break_ctl,
+	.startup	= mvf_startup,
+	.shutdown	= mvf_shutdown,
+	.set_termios	= mvf_set_termios,
+	.type		= mvf_type,
+	.release_port	= mvf_release_port,
+	.request_port	= mvf_request_port,
+	.config_port	= mvf_config_port,
+	.verify_port	= mvf_verify_port,
+};
+
+static struct mvf_port *mvf_ports[UART_NR];
+
+#ifdef CONFIG_SERIAL_MVF_CONSOLE
+static void mvf_console_putchar(struct uart_port *port, int ch)
+{
+	struct mvf_port *sport = (struct mvf_port *)port;
+
+	while (!(readb(sport->port.membase + MXC_UARTSR1) & MXC_UARTSR1_TDRE))
+		barrier();
+
+	writeb(ch, sport->port.membase + MXC_UARTDR);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+mvf_console_write(struct console *co, const char *s, unsigned int count)
+{
+	struct mvf_port *sport = mvf_ports[co->index];
+	unsigned int  old_cr2, cr2;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+	/*
+	 * First, save UCR1/2 and then disable interrupts
+	 */
+	cr2 = old_cr2 = readb(sport->port.membase + MXC_UARTCR2);
+
+	cr2 |= (MXC_UARTCR2_TE |  MXC_UARTCR2_RE);
+	cr2 &= ~(MXC_UARTCR2_TIE | MXC_UARTCR2_TCIE | MXC_UARTCR2_RIE);
+
+	writeb(cr2, sport->port.membase + MXC_UARTCR2);
+
+	uart_console_write(&sport->port, s, count, mvf_console_putchar);
+
+	/*
+	 * wait for transmitter finish complete and restore CR2
+	 */
+	while (!(readb(sport->port.membase + MXC_UARTSR1) & MXC_UARTSR1_TC))
+		;
+
+	writeb(old_cr2, sport->port.membase + MXC_UARTCR2);
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+/*
+ * If the port was already initialised (eg, by a boot loader),
+ * try to determine the current setup.
+ */
+static void __init
+mvf_console_get_options(struct mvf_port *sport, int *baud,
+			   int *parity, int *bits)
+{
+
+	if (readb(sport->port.membase + MXC_UARTCR2) &
+			(MXC_UARTCR2_TE | MXC_UARTCR2)) {
+		/* ok, the port was enabled */
+		unsigned char cr1, bdh, bdl, brfa;
+		unsigned int sbr, uartclk;
+		unsigned int baud_raw;
+
+		cr1 = readb(sport->port.membase + MXC_UARTCR1);
+
+		*parity = 'n';
+		if (cr1 & MXC_UARTCR1_PE) {
+			if (cr1 & MXC_UARTCR1_PT)
+				*parity = 'o';
+			else
+				*parity = 'e';
+		}
+
+		if (cr1 & MXC_UARTCR1_M)
+			*bits = 9;
+		else
+			*bits = 8;
+
+		bdh = readb(sport->port.membase + MXC_UARTBDH) &
+						MXC_UARTBDH_SBR_MASK;
+		bdl = readb(sport->port.membase + MXC_UARTBDL);
+		sbr = bdh;
+		sbr <<= 8;
+		sbr |= bdl;
+		brfa = readb(sport->port.membase + MXC_UARTCR4) &
+						MXC_UARTCR4_BRFA_MASK;
+		uartclk = clk_get_rate(sport->clk);
+		/*
+		 * Baud = mod_clk/(16*(sbr[13]+(brfa)/32)
+		 */
+		baud_raw = uartclk/(16 * (sbr + brfa/32));
+
+		if (*baud != baud_raw)
+			printk(KERN_INFO "Serial: Console IMX "
+					"rounded baud rate from %d to %d\n",
+				baud_raw, *baud);
+	}
+}
+
+static int __init
+mvf_console_setup(struct console *co, char *options)
+{
+	struct mvf_port *sport;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	/*
+	 * Check whether an invalid uart number has been specified, and
+	 * if so, search for the first available port that does have
+	 * console support.
+	 */
+	if (co->index == -1 || co->index >= ARRAY_SIZE(mvf_ports))
+		co->index = 0;
+	sport = mvf_ports[co->index];
+
+	if (sport == NULL)
+		return -ENODEV;
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+	else
+		mvf_console_get_options(sport, &baud, &parity, &bits);
+
+	if (sport->fifo_en == 1)
+		mvf_setup_watermark(sport, 0);
+
+	return uart_set_options(&sport->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver mvf_reg;
+static struct console mvf_console = {
+	.name		= DEV_NAME,
+	.write		= mvf_console_write,
+	.device		= uart_console_device,
+	.setup		= mvf_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+	.data		= &mvf_reg,
+};
+
+#define MVF_CONSOLE	(&mvf_console)
+#else
+#define MVF_CONSOLE	NULL
+#endif
+
+static struct uart_driver mvf_reg = {
+	.owner          = THIS_MODULE,
+	.driver_name    = DRIVER_NAME,
+	.dev_name       = DEV_NAME,
+	.major          = SERIAL_IMX_MAJOR,
+	.minor          = MINOR_START,
+	.nr             = ARRAY_SIZE(mvf_ports),
+	.cons           = MVF_CONSOLE,
+};
+
+static int serial_mvf_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct mvf_port *sport = platform_get_drvdata(dev);
+
+	/* Enable UART wakeup */
+
+	if (sport)
+		uart_suspend_port(&mvf_reg, &sport->port);
+
+	return 0;
+}
+
+static int serial_mvf_resume(struct platform_device *dev)
+{
+	struct mvf_port *sport = platform_get_drvdata(dev);
+
+	if (sport)
+		uart_resume_port(&mvf_reg, &sport->port);
+
+	/* Disable UART wakeup */
+
+	return 0;
+}
+
+static int serial_mvf_probe_dt(struct mvf_port *sport,
+		struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int ret;
+
+	if (!np)
+		/* no device tree device */
+		return 1;
+
+	ret = of_alias_get_id(np, "serial");
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
+		return ret;
+	}
+	sport->port.line = ret;
+
+	if (of_get_property(np, "fsl,uart-fifo-mode", NULL))
+		sport->fifo_en = 1;
+
+	return 0;
+}
+
+static int serial_mvf_probe(struct platform_device *pdev)
+{
+	struct mvf_port *sport;
+	struct imxuart_platform_data *pdata;
+	void __iomem *base;
+	int ret = 0;
+	struct resource *res;
+
+	sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
+	if (!sport)
+		return -ENOMEM;
+
+	pdev->dev.coherent_dma_mask = 0;
+
+	ret = serial_mvf_probe_dt(sport, pdev);
+	if (ret < 0)
+		return ret ;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+
+	base = devm_ioremap(&pdev->dev, res->start, PAGE_SIZE);
+	if (!base)
+		return -ENOMEM;
+
+	sport->port.dev = &pdev->dev;
+	sport->port.mapbase = res->start;
+	sport->port.membase = base;
+	sport->port.type = PORT_MVF,
+	sport->port.iotype = UPIO_MEM;
+	sport->port.irq = platform_get_irq(pdev, 0);
+	sport->port.fifosize = 32;
+	sport->port.ops = &mvf_pops;
+	sport->port.flags = UPF_BOOT_AUTOCONF;
+	if (pdev->id >= 0)
+		sport->port.line = pdev->id;
+
+	sport->clk = devm_clk_get(&pdev->dev, "ipg");
+	if (IS_ERR(sport->clk)) {
+		ret = PTR_ERR(sport->clk);
+		dev_err(&pdev->dev, "failed to uart clk: %d\n", ret);
+		return ret;
+	}
+
+	clk_prepare_enable(sport->clk);
+
+	sport->port.uartclk = clk_get_rate(sport->clk);
+
+	mvf_ports[sport->port.line] = sport;
+
+	pdata = pdev->dev.platform_data;
+
+	/* all uarts support hardware RTS/CTS */
+	sport->have_rtscts = 1;
+
+	if (pdata && pdata->init) {
+		ret = pdata->init(pdev);
+		if (ret)
+			goto clkput;
+	}
+
+	ret = uart_add_one_port(&mvf_reg, &sport->port);
+
+	if (ret)
+		goto deinit;
+	platform_set_drvdata(pdev, &sport->port);
+
+	return 0;
+deinit:
+	if (pdata && pdata->exit)
+		pdata->exit(pdev);
+clkput:
+	clk_disable_unprepare(sport->clk);
+
+	return ret;
+}
+
+static int serial_mvf_remove(struct platform_device *pdev)
+{
+	struct imxuart_platform_data *pdata;
+	struct mvf_port *sport = platform_get_drvdata(pdev);
+
+	pdata = pdev->dev.platform_data;
+
+	platform_set_drvdata(pdev, NULL);
+
+	if (sport)
+		uart_remove_one_port(&mvf_reg, &sport->port);
+
+	clk_disable_unprepare(sport->clk);
+
+	if (pdata && pdata->exit)
+		pdata->exit(pdev);
+
+	return 0;
+}
+
+static struct platform_driver serial_mvf_driver = {
+	.probe		= serial_mvf_probe,
+	.remove		= serial_mvf_remove,
+
+	.suspend	= serial_mvf_suspend,
+	.resume		= serial_mvf_resume,
+	.id_table       = mvf_uart_devtype,
+	.driver		= {
+		.name	= "mvf-uart",
+		.owner	= THIS_MODULE,
+		.of_match_table = mvf_uart_dt_ids,
+	},
+};
+
+static int __init mvf_serial_init(void)
+{
+	int ret;
+
+	pr_info("Serial: Vybrid Family driver\n");
+
+	ret = uart_register_driver(&mvf_reg);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&serial_mvf_driver);
+	if (ret != 0)
+		uart_unregister_driver(&mvf_reg);
+
+	return 0;
+}
+
+static void __exit mvf_serial_exit(void)
+{
+	platform_driver_unregister(&serial_mvf_driver);
+	uart_unregister_driver(&mvf_reg);
+}
+
+module_init(mvf_serial_init);
+module_exit(mvf_serial_exit);
+
+MODULE_DESCRIPTION("Vybrid Family serial port driver");
+MODULE_LICENSE("GPL");
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index 74c2bf7..ffb7192 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -226,4 +226,7 @@
 /* Rocketport EXPRESS/INFINITY */
 #define PORT_RP2	102
 
+/* Freescale Vybrid uart */
+#define PORT_MVF	103
+
 #endif /* _UAPILINUX_SERIAL_CORE_H */
-- 
1.8.0

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