Re: Reposting: [PATCH v1] serial: Add OMAP high-speed UART driver.

[Govindraj.R]

Hi Greg,

Could you please have this patch into your tty tree now?

As I do not see any further comment in community on this
for quite long time now.

-- 
Regards,
Govindraj.R

> This time CC'ing Linux-serial and LKML too, forgot last time.
>
> --
> Govindraj.R
>
>
> This patch adds driver support for OMAP3/4 high speed UART.
>
> This driver is made separate from 8250 driver as we cannot
> over load 8250 driver with omap platform specific configuration for
> features like DMA, it makes easier to implement features like DMA and
> hardware flow control and software flow control configuration with
> this driver as required for the omap-platform.
>
> This patch involves only the core driver and its dependent.
> This patch doesn't incorporate platform specific data as this will be
> posted from linux-omap tree and this driver was tested with Kevins PM
> branch which currently hosts the omap-serial platform data which utilises
> the omap-hwmod framework.
>
> Cc: Tony Lindgren <tony@xxxxxxxxxxx>
> Cc: Olof Johansson <olof@xxxxxxxxx>
> Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
> Tested-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Govindraj R <govindraj.raja@xxxxxx>
> ---
>  arch/arm/plat-omap/include/plat/omap-serial.h |  128 +++
>  drivers/serial/Kconfig                        |   27 +
>  drivers/serial/Makefile                       |    1 +
>  drivers/serial/omap-serial.c                  | 1316 +++++++++++++++++++++++++
>  include/linux/serial_core.h                   |    3 +
>  5 files changed, 1475 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/plat-omap/include/plat/omap-serial.h
>  create mode 100644 drivers/serial/omap-serial.c
>
> diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h
> b/arch/arm/plat-omap/include/plat/omap-serial.h
> new file mode 100644
> index 0000000..2a1e7f9
> --- /dev/null
> +++ b/arch/arm/plat-omap/include/plat/omap-serial.h
> @@ -0,0 +1,128 @@
> +/*
> + * Driver for OMAP-UART controller.
> + * Based on drivers/serial/8250.c
> + *
> + * Copyright (C) 2010 Texas Instruments.
> + *
> + * Authors:
> + *	Govindraj R	<govindraj.raja@xxxxxx>
> + *	Thara Gopinath	<thara@xxxxxx>
> + *
> + * 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.
> + */
> +
> +#ifndef __OMAP_SERIAL_H__
> +#define __OMAP_SERIAL_H__
> +
> +#include <linux/serial_core.h>
> +#include <linux/platform_device.h>
> +
> +#include <plat/control.h>
> +#include <plat/mux.h>
> +
> +#define DRIVER_NAME	"omap-hsuart"
> +
> +/*
> + * Use tty device name as ttyO, [O -> OMAP]
> + * in bootargs we specify as console=ttyO0 if uart1
> + * is used as console uart.
> + */
> +#define OMAP_SERIAL_NAME	"ttyO"
> +
> +#define OMAP_MDR1_DISABLE	0x07
> +#define OMAP_MDR1_MODE13X	0x03
> +#define OMAP_MDR1_MODE16X	0x00
> +#define OMAP_MODE13X_SPEED	230400
> +
> +/*
> + * LCR = 0XBF: Switch to Configuration Mode B.
> + * In configuration mode b allow access
> + * to EFR,DLL,DLH.
> + * Reference OMAP TRM Chapter 17
> + * Section: 1.4.3 Mode Selection
> + */
> +#define OMAP_UART_LCR_CONF_MDB	0XBF
> +
> +/* WER = 0x7F
> + * Enable module level wakeup in WER reg
> + */
> +#define OMAP_UART_WER_MOD_WKUP	0X7F
> +
> +/* Enable XON/XOFF flow control on output */
> +#define OMAP_UART_SW_TX		0x04
> +
> +/* Enable XON/XOFF flow control on input */
> +#define OMAP_UART_SW_RX		0x04
> +
> +#define OMAP_UART_SYSC_RESET	0X07
> +#define OMAP_UART_TCR_TRIG	0X0F
> +#define OMAP_UART_SW_CLR	0XF0
> +
> +#define OMAP_UART_DMA_CH_FREE	-1
> +
> +#define RX_TIMEOUT		(3 * HZ)
> +#define OMAP_MAX_HSUART_PORTS	4
> +
> +#define MSR_SAVE_FLAGS		UART_MSR_ANY_DELTA
> +
> +struct omap_uart_port_info {
> +	bool			dma_enabled;	/* To specify DMA Mode */
> +	unsigned int		uartclk;	/* UART clock rate */
> +	void __iomem		*membase;	/* ioremap cookie or NULL */
> +	resource_size_t		mapbase;	/* resource base */
> +	unsigned long		irqflags;	/* request_irq flags */
> +	upf_t			flags;		/* UPF_* flags */
> +};
> +
> +struct uart_omap_dma {
> +	u8			uart_dma_tx;
> +	u8			uart_dma_rx;
> +	int			rx_dma_channel;
> +	int			tx_dma_channel;
> +	dma_addr_t		rx_buf_dma_phys;
> +	dma_addr_t		tx_buf_dma_phys;
> +	unsigned int		uart_base;
> +	/*
> +	 * Buffer for rx dma.It is not required for tx because the buffer
> +	 * comes from port structure.
> +	 */
> +	unsigned char		*rx_buf;
> +	unsigned int		prev_rx_dma_pos;
> +	int			tx_buf_size;
> +	int			tx_dma_used;
> +	int			rx_dma_used;
> +	spinlock_t		tx_lock;
> +	spinlock_t		rx_lock;
> +	/* timer to poll activity on rx dma */
> +	struct timer_list	rx_timer;
> +	int			rx_buf_size;
> +	int			rx_timeout;
> +};
> +
> +struct uart_omap_port {
> +	struct uart_port	port;
> +	struct uart_omap_dma	uart_dma;
> +	struct platform_device	*pdev;
> +
> +	unsigned char		ier;
> +	unsigned char		lcr;
> +	unsigned char		mcr;
> +	unsigned char		fcr;
> +	unsigned char		efr;
> +
> +	int			use_dma;
> +	/*
> +	 * Some bits in registers are cleared on a read, so they must
> +	 * be saved whenever the register is read but the bits will not
> +	 * be immediately processed.
> +	 */
> +	unsigned int		lsr_break_flag;
> +	unsigned char		msr_saved_flags;
> +	char			name[20];
> +	unsigned long		port_activity;
> +};
> +
> +#endif /* __OMAP_SERIAL_H__ */
> diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
> index 9ff47db..95055e7 100644
> --- a/drivers/serial/Kconfig
> +++ b/drivers/serial/Kconfig
> @@ -1366,6 +1366,33 @@ config SERIAL_OF_PLATFORM
>  	  Currently, only 8250 compatible ports are supported, but
>  	  others can easily be added.
>
> +config SERIAL_OMAP
> +	tristate "OMAP serial port support"
> +	depends on ARCH_OMAP3 || ARCH_OMAP4
> +	select SERIAL_CORE
> +	help
> +	  If you have a machine based on an Texas Instruments OMAP CPU you
> +	  can enable its onboard serial ports by enabling this option.
> +
> +	  By enabling this option you take advantage of dma feature available
> +	  with the omap-serial driver. DMA support can be enabled from platform
> +	  data.
> +
> +config SERIAL_OMAP_CONSOLE
> +	bool "Console on OMAP serial port"
> +	depends on SERIAL_OMAP
> +	select SERIAL_CORE_CONSOLE
> +	help
> +	  Select this option if you would like to use omap serial port as
> +	  console.
> +
> +	  Even if you say Y here, the currently visible virtual console
> +	  (/dev/tty0) will still be used as the system console by default, but
> +	  you can alter that using a kernel command line option such as
> +	  "console=ttyOx". (Try "man bootparam" or see the documentation of
> +	  your boot loader about how to pass options to the kernel at
> +	  boot time.)
> +
>  config SERIAL_OF_PLATFORM_NWPSERIAL
>  	tristate "NWP serial port driver"
>  	depends on PPC_OF && PPC_DCR
> diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
> index 5548fe7..42962b3 100644
> --- a/drivers/serial/Makefile
> +++ b/drivers/serial/Makefile
> @@ -82,3 +82,4 @@ obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgdboc.o
>  obj-$(CONFIG_SERIAL_QE) += ucc_uart.o
>  obj-$(CONFIG_SERIAL_TIMBERDALE)	+= timbuart.o
>  obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o
> +obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
> diff --git a/drivers/serial/omap-serial.c b/drivers/serial/omap-serial.c
> new file mode 100644
> index 0000000..3e6d608
> --- /dev/null
> +++ b/drivers/serial/omap-serial.c
> @@ -0,0 +1,1316 @@
> +/*
> + * Driver for OMAP-UART controller.
> + * Based on drivers/serial/8250.c
> + *
> + * Copyright (C) 2010 Texas Instruments.
> + *
> + * Authors:
> + *	Govindraj R	<govindraj.raja@xxxxxx>
> + *	Thara Gopinath	<thara@xxxxxx>
> + *
> + * 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.
> + *
> + * Note: This driver is made seperate from 8250 driver as we cannot
> + * over load 8250 driver with omap platform specific configuration for
> + * features like DMA, it makes easier to implement features like DMA and
> + * hardware flow control and software flow control configuration with
> + * this driver as required for the omap-platform.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/console.h>
> +#include <linux/serial_reg.h>
> +#include <linux/delay.h>
> +#include <linux/tty.h>
> +#include <linux/tty_flip.h>
> +#include <linux/io.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/clk.h>
> +#include <linux/serial_core.h>
> +
> +#include <asm/irq.h>
> +#include <plat/dma.h>
> +#include <plat/dmtimer.h>
> +#include <plat/omap-serial.h>
> +
> +static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
> +
> +/* Forward declaration of functions */
> +static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
> +static void serial_omap_rx_timeout(unsigned long uart_no);
> +static int serial_omap_start_rxdma(struct uart_omap_port *up);
> +
> +static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
> +{
> +	offset <<= up->port.regshift;
> +	return readw(up->port.membase + offset);
> +}
> +
> +static inline void serial_out(struct uart_omap_port *up, int offset, int value)
> +{
> +	offset <<= up->port.regshift;
> +	writew(value, up->port.membase + offset);
> +}
> +
> +static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
> +{
> +	serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
> +	serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
> +		       UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
> +	serial_out(up, UART_FCR, 0);
> +}
> +
> +/**
> + * serial_omap_get_divisor() - calculate divisor value
> + * @port: uart port info
> + * @baud: baudrate for which divisor needs to be calculated.
> + *
> + * We have written our own function to get the divisor so as to support
> + * 13x mode. 3Mbps Baudrate as an different divisor.
> + * Reference OMAP TRM Chapter 17:
> + * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
> + * referring to oversampling - divisor value
> + * baudrate 460,800 to 3,686,400 all have divisor 13
> + * except 3,000,000 which has divisor value 16
> + */
> +static unsigned int
> +serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
> +{
> +	unsigned int divisor;
> +
> +	if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
> +		divisor = 13;
> +	else
> +		divisor = 16;
> +	return port->uartclk/(baud * divisor);
> +}
> +
> +static void serial_omap_stop_rxdma(struct uart_omap_port *up)
> +{
> +	if (up->uart_dma.rx_dma_used) {
> +		del_timer_sync(&up->uart_dma.rx_timer);
> +		omap_stop_dma(up->uart_dma.rx_dma_channel);
> +		omap_free_dma(up->uart_dma.rx_dma_channel);
> +		up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
> +		up->uart_dma.rx_dma_used = false;
> +	}
> +}
> +
> +static void serial_omap_enable_ms(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> +	dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->pdev->id);
> +	up->ier |= UART_IER_MSI;
> +	serial_out(up, UART_IER, up->ier);
> +}
> +
> +static void serial_omap_stop_tx(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> +	if (up->use_dma &&
> +		up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) {
> +		/*
> +		 * Check if dma is still active. If yes do nothing,
> +		 * return. Else stop dma
> +		 */
> +		if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel))
> +			return;
> +		omap_stop_dma(up->uart_dma.tx_dma_channel);
> +		omap_free_dma(up->uart_dma.tx_dma_channel);
> +		up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
> +	}
> +
> +	if (up->ier & UART_IER_THRI) {
> +		up->ier &= ~UART_IER_THRI;
> +		serial_out(up, UART_IER, up->ier);
> +	}
> +}
> +
> +static void serial_omap_stop_rx(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> +	if (up->use_dma)
> +		serial_omap_stop_rxdma(up);
> +	up->ier &= ~UART_IER_RLSI;
> +	up->port.read_status_mask &= ~UART_LSR_DR;
> +	serial_out(up, UART_IER, up->ier);
> +}
> +
> +static inline void receive_chars(struct uart_omap_port *up, int *status)
> +{
> +	struct tty_struct *tty = up->port.state->port.tty;
> +	unsigned int flag;
> +	unsigned char ch, lsr = *status;
> +	int max_count = 256;
> +
> +	do {
> +		if (likely(lsr & UART_LSR_DR))
> +			ch = serial_in(up, UART_RX);
> +		flag = TTY_NORMAL;
> +		up->port.icount.rx++;
> +
> +		if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
> +			/*
> +			 * For statistics only
> +			 */
> +			if (lsr & UART_LSR_BI) {
> +				lsr &= ~(UART_LSR_FE | UART_LSR_PE);
> +				up->port.icount.brk++;
> +				/*
> +				 * We do the SysRQ and SAK checking
> +				 * here because otherwise the break
> +				 * may get masked by ignore_status_mask
> +				 * or read_status_mask.
> +				 */
> +				if (uart_handle_break(&up->port))
> +					goto ignore_char;
> +			} else if (lsr & UART_LSR_PE)
> +				up->port.icount.parity++;
> +			else if (lsr & UART_LSR_FE)
> +				up->port.icount.frame++;
> +			if (lsr & UART_LSR_OE)
> +				up->port.icount.overrun++;
> +
> +			/*
> +			 * Mask off conditions which should be ignored.
> +			 */
> +			lsr &= up->port.read_status_mask;
> +
> +#ifdef CONFIG_SERIAL_OMAP_CONSOLE
> +			if (up->port.line == up->port.cons->index) {
> +				/* Recover the break flag from console xmit */
> +				lsr |= up->lsr_break_flag;
> +				up->lsr_break_flag = 0;
> +			}
> +#endif
> +			if (lsr & UART_LSR_BI)
> +				flag = TTY_BREAK;
> +			else if (lsr & UART_LSR_PE)
> +				flag = TTY_PARITY;
> +			else if (lsr & UART_LSR_FE)
> +				flag = TTY_FRAME;
> +		}
> +
> +		if (uart_handle_sysrq_char(&up->port, ch))
> +			goto ignore_char;
> +		uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
> +ignore_char:
> +		lsr = serial_in(up, UART_LSR);
> +	} while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
> +	spin_unlock(&up->port.lock);
> +	tty_flip_buffer_push(tty);
> +	spin_lock(&up->port.lock);
> +}
> +
> +static void transmit_chars(struct uart_omap_port *up)
> +{
> +	struct circ_buf *xmit = &up->port.state->xmit;
> +	int count;
> +
> +	if (up->port.x_char) {
> +		serial_out(up, UART_TX, up->port.x_char);
> +		up->port.icount.tx++;
> +		up->port.x_char = 0;
> +		return;
> +	}
> +	if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
> +		serial_omap_stop_tx(&up->port);
> +		return;
> +	}
> +	count = up->port.fifosize / 4;
> +	do {
> +		serial_out(up, UART_TX, xmit->buf[xmit->tail]);
> +		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> +		up->port.icount.tx++;
> +		if (uart_circ_empty(xmit))
> +			break;
> +	} while (--count > 0);
> +
> +	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
> +		uart_write_wakeup(&up->port);
> +
> +	if (uart_circ_empty(xmit))
> +		serial_omap_stop_tx(&up->port);
> +}
> +
> +static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
> +{
> +	if (!(up->ier & UART_IER_THRI)) {
> +		up->ier |= UART_IER_THRI;
> +		serial_out(up, UART_IER, up->ier);
> +	}
> +}
> +
> +static void serial_omap_start_tx(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	struct circ_buf *xmit;
> +	unsigned int start;
> +	int ret = 0;
> +
> +	if (!up->use_dma || up->port.x_char) {
> +		serial_omap_enable_ier_thri(up);
> +		return;
> +	}
> +
> +	xmit = &up->port.state->xmit;
> +	if (uart_circ_empty(xmit) || up->uart_dma.tx_dma_used)
> +		return;
> +
> +	if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE)
> +		ret = omap_request_dma(up->uart_dma.uart_dma_tx,
> +				"UART Tx DMA",
> +				(void *)uart_tx_dma_callback, up,
> +				&(up->uart_dma.tx_dma_channel));
> +
> +	if (ret < 0) {
> +		serial_omap_enable_ier_thri(up);
> +		return;
> +	}
> +
> +	start = up->uart_dma.tx_buf_dma_phys +
> +				(xmit->tail & (UART_XMIT_SIZE - 1));
> +	spin_lock(&(up->uart_dma.tx_lock));
> +	up->uart_dma.tx_dma_used = true;
> +	spin_unlock(&(up->uart_dma.tx_lock));
> +
> +	up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
> +	/*
> +	 * It is a circular buffer. See if the buffer has wounded back.
> +	 * If yes it will have to be transferred in two separate dma
> +	 * transfers
> +	 */
> +	if (start + up->uart_dma.tx_buf_size >=
> +			up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
> +		up->uart_dma.tx_buf_size =
> +			(up->uart_dma.tx_buf_dma_phys +
> +			UART_XMIT_SIZE) - start;
> +
> +	omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
> +				OMAP_DMA_AMODE_CONSTANT,
> +				up->uart_dma.uart_base, 0, 0);
> +	omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
> +				OMAP_DMA_AMODE_POST_INC, start, 0, 0);
> +	omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
> +				OMAP_DMA_DATA_TYPE_S8,
> +				up->uart_dma.tx_buf_size, 1,
> +				OMAP_DMA_SYNC_ELEMENT,
> +				up->uart_dma.uart_dma_tx, 0);
> +	/* FIXME: Cache maintenance needed here? */
> +	omap_start_dma(up->uart_dma.tx_dma_channel);
> +}
> +
> +static unsigned int check_modem_status(struct uart_omap_port *up)
> +{
> +	int status;
> +	status = serial_in(up, UART_MSR);
> +
> +	status |= up->msr_saved_flags;
> +	up->msr_saved_flags = 0;
> +
> +	if ((status & UART_MSR_ANY_DELTA) == 0)
> +		return status;
> +	if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
> +	    up->port.state != NULL) {
> +		if (status & UART_MSR_TERI)
> +			up->port.icount.rng++;
> +		if (status & UART_MSR_DDSR)
> +			up->port.icount.dsr++;
> +		if (status & UART_MSR_DDCD)
> +			uart_handle_dcd_change
> +				(&up->port, status & UART_MSR_DCD);
> +		if (status & UART_MSR_DCTS)
> +			uart_handle_cts_change
> +				(&up->port, status & UART_MSR_CTS);
> +		wake_up_interruptible(&up->port.state->port.delta_msr_wait);
> +	}
> +
> +	return status;
> +}
> +
> +/**
> + * serial_omap_irq() - This handles the interrupt from one port
> + * @irq: uart port irq number
> + * @dev_id: uart port info
> + */
> +static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
> +{
> +	struct uart_omap_port *up = dev_id;
> +	unsigned int iir, lsr;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&up->port.lock, flags);
> +	iir = serial_in(up, UART_IIR);
> +	if (iir & UART_IIR_NO_INT)
> +		return IRQ_NONE;
> +
> +	lsr = serial_in(up, UART_LSR);
> +	if (iir & UART_IER_RLSI) {
> +		if (up->use_dma)
> +			up->ier &= ~UART_IER_RDI;
> +			serial_out(up, UART_IER, up->ier);
> +		if (!up->use_dma ||
> +				serial_omap_start_rxdma(up) != 0)
> +			if (lsr & UART_LSR_DR)
> +				receive_chars(up, &lsr);
> +		}
> +
> +	check_modem_status(up);
> +	if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI))
> +		transmit_chars(up);
> +
> +	spin_unlock_irqrestore(&up->port.lock, flags);
> +	up->port_activity = jiffies;
> +	return IRQ_HANDLED;
> +}
> +
> +static unsigned int serial_omap_tx_empty(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	unsigned long flags = 0;
> +	unsigned int ret = 0;
> +
> +	dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->pdev->id);
> +	spin_lock_irqsave(&up->port.lock, flags);
> +	ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
> +	spin_unlock_irqrestore(&up->port.lock, flags);
> +
> +	return ret;
> +}
> +
> +static unsigned int serial_omap_get_mctrl(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	unsigned char status;
> +	unsigned int ret = 0;
> +
> +	status = check_modem_status(up);
> +	dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->pdev->id);
> +
> +	if (status & UART_MSR_DCD)
> +		ret |= TIOCM_CAR;
> +	if (status & UART_MSR_RI)
> +		ret |= TIOCM_RNG;
> +	if (status & UART_MSR_DSR)
> +		ret |= TIOCM_DSR;
> +	if (status & UART_MSR_CTS)
> +		ret |= TIOCM_CTS;
> +	return ret;
> +}
> +
> +static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	unsigned char mcr = 0;
> +
> +	dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->pdev->id);
> +	if (mctrl & TIOCM_RTS)
> +		mcr |= UART_MCR_RTS;
> +	if (mctrl & TIOCM_DTR)
> +		mcr |= UART_MCR_DTR;
> +	if (mctrl & TIOCM_OUT1)
> +		mcr |= UART_MCR_OUT1;
> +	if (mctrl & TIOCM_OUT2)
> +		mcr |= UART_MCR_OUT2;
> +	if (mctrl & TIOCM_LOOP)
> +		mcr |= UART_MCR_LOOP;
> +
> +	mcr |= up->mcr;
> +	serial_out(up, UART_MCR, mcr);
> +}
> +
> +static void serial_omap_break_ctl(struct uart_port *port, int break_state)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	unsigned long flags = 0;
> +
> +	dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->pdev->id);
> +	spin_lock_irqsave(&up->port.lock, flags);
> +	if (break_state == -1)
> +		up->lcr |= UART_LCR_SBC;
> +	else
> +		up->lcr &= ~UART_LCR_SBC;
> +	serial_out(up, UART_LCR, up->lcr);
> +	spin_unlock_irqrestore(&up->port.lock, flags);
> +}
> +
> +static int serial_omap_startup(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	unsigned long flags = 0;
> +	int retval;
> +
> +	/*
> +	 * Allocate the IRQ
> +	 */
> +	retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
> +				up->name, up);
> +	if (retval)
> +		return retval;
> +
> +	dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->pdev->id);
> +
> +	/*
> +	 * Clear the FIFO buffers and disable them.
> +	 * (they will be reenabled in set_termios())
> +	 */
> +	serial_omap_clear_fifos(up);
> +	/* For Hardware flow control */
> +	serial_out(up, UART_MCR, UART_MCR_RTS);
> +
> +	/*
> +	 * Clear the interrupt registers.
> +	 */
> +	(void) serial_in(up, UART_LSR);
> +	if (serial_in(up, UART_LSR) & UART_LSR_DR)
> +		(void) serial_in(up, UART_RX);
> +	(void) serial_in(up, UART_IIR);
> +	(void) serial_in(up, UART_MSR);
> +
> +	/*
> +	 * Now, initialize the UART
> +	 */
> +	serial_out(up, UART_LCR, UART_LCR_WLEN8);
> +	spin_lock_irqsave(&up->port.lock, flags);
> +	/*
> +	 * Most PC uarts need OUT2 raised to enable interrupts.
> +	 */
> +	up->port.mctrl |= TIOCM_OUT2;
> +	serial_omap_set_mctrl(&up->port, up->port.mctrl);
> +	spin_unlock_irqrestore(&up->port.lock, flags);
> +
> +	up->msr_saved_flags = 0;
> +	if (up->use_dma) {
> +		free_page((unsigned long)up->port.state->xmit.buf);
> +		up->port.state->xmit.buf = dma_alloc_coherent(NULL,
> +			UART_XMIT_SIZE,
> +			(dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys),
> +			0);
> +		init_timer(&(up->uart_dma.rx_timer));
> +		up->uart_dma.rx_timer.function = serial_omap_rx_timeout;
> +		up->uart_dma.rx_timer.data = up->pdev->id;
> +		/* Currently the buffer size is 4KB. Can increase it */
> +		up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
> +			up->uart_dma.rx_buf_size,
> +			(dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
> +	}
> +	/*
> +	 * Finally, enable interrupts. Note: Modem status interrupts
> +	 * are set via set_termios(), which will be occurring imminently
> +	 * anyway, so we don't enable them here.
> +	 */
> +	up->ier = UART_IER_RLSI | UART_IER_RDI;
> +	serial_out(up, UART_IER, up->ier);
> +
> +	up->port_activity = jiffies;
> +	return 0;
> +}
> +
> +static void serial_omap_shutdown(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	unsigned long flags = 0;
> +
> +	dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id);
> +	/*
> +	 * Disable interrupts from this port
> +	 */
> +	up->ier = 0;
> +	serial_out(up, UART_IER, 0);
> +
> +	spin_lock_irqsave(&up->port.lock, flags);
> +	up->port.mctrl &= ~TIOCM_OUT2;
> +	serial_omap_set_mctrl(&up->port, up->port.mctrl);
> +	spin_unlock_irqrestore(&up->port.lock, flags);
> +
> +	/*
> +	 * Disable break condition and FIFOs
> +	 */
> +	serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
> +	serial_omap_clear_fifos(up);
> +
> +	/*
> +	 * Read data port to reset things, and then free the irq
> +	 */
> +	if (serial_in(up, UART_LSR) & UART_LSR_DR)
> +		(void) serial_in(up, UART_RX);
> +	if (up->use_dma) {
> +		int tmp;
> +		dma_free_coherent(up->port.dev,
> +			UART_XMIT_SIZE,	up->port.state->xmit.buf,
> +			up->uart_dma.tx_buf_dma_phys);
> +		up->port.state->xmit.buf = NULL;
> +		serial_omap_stop_rx(port);
> +		dma_free_coherent(up->port.dev,
> +			up->uart_dma.rx_buf_size, up->uart_dma.rx_buf,
> +			up->uart_dma.rx_buf_dma_phys);
> +		up->uart_dma.rx_buf = NULL;
> +		tmp = serial_in(up, UART_OMAP_SYSC) & OMAP_UART_SYSC_RESET;
> +		serial_out(up, UART_OMAP_SYSC, tmp); /* force-idle */
> +	}
> +	free_irq(up->port.irq, up);
> +}
> +
> +static inline void
> +serial_omap_configure_xonxoff
> +		(struct uart_omap_port *up, struct ktermios *termios)
> +{
> +	unsigned char efr = 0;
> +
> +	up->lcr = serial_in(up, UART_LCR);
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +	up->efr = serial_in(up, UART_EFR);
> +	serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
> +
> +	serial_out(up, UART_XON1, termios->c_cc[VSTART]);
> +	serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
> +
> +	/* clear SW control mode bits */
> +	efr = up->efr;
> +	efr &= OMAP_UART_SW_CLR;
> +
> +	/*
> +	 * IXON Flag:
> +	 * Enable XON/XOFF flow control on output.
> +	 * Transmit XON1, XOFF1
> +	 */
> +	if (termios->c_iflag & IXON)
> +		efr |= OMAP_UART_SW_TX;
> +
> +	/*
> +	 * IXOFF Flag:
> +	 * Enable XON/XOFF flow control on input.
> +	 * Receiver compares XON1, XOFF1.
> +	 */
> +	if (termios->c_iflag & IXOFF)
> +		efr |= OMAP_UART_SW_RX;
> +
> +	serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
> +	serial_out(up, UART_LCR, UART_LCR_DLAB);
> +
> +	up->mcr = serial_in(up, UART_MCR);
> +
> +	/*
> +	 * IXANY Flag:
> +	 * Enable any character to restart output.
> +	 * Operation resumes after receiving any
> +	 * character after recognition of the XOFF character
> +	 */
> +	if (termios->c_iflag & IXANY)
> +		up->mcr |= UART_MCR_XONANY;
> +
> +	serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +	serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
> +	/* Enable special char function UARTi.EFR_REG[5] and
> +	 * load the new software flow control mode IXON or IXOFF
> +	 * and restore the UARTi.EFR_REG[4] ENHANCED_EN value.
> +	 */
> +	serial_out(up, UART_EFR, efr | UART_EFR_SCD);
> +	serial_out(up, UART_LCR, UART_LCR_DLAB);
> +
> +	serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
> +	serial_out(up, UART_LCR, up->lcr);
> +}
> +
> +static void
> +serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
> +			struct ktermios *old)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	unsigned char cval = 0;
> +	unsigned char efr = 0;
> +	unsigned long flags = 0;
> +	unsigned int baud, quot;
> +
> +	switch (termios->c_cflag & CSIZE) {
> +	case CS5:
> +		cval = UART_LCR_WLEN5;
> +		break;
> +	case CS6:
> +		cval = UART_LCR_WLEN6;
> +		break;
> +	case CS7:
> +		cval = UART_LCR_WLEN7;
> +		break;
> +	default:
> +	case CS8:
> +		cval = UART_LCR_WLEN8;
> +		break;
> +	}
> +
> +	if (termios->c_cflag & CSTOPB)
> +		cval |= UART_LCR_STOP;
> +	if (termios->c_cflag & PARENB)
> +		cval |= UART_LCR_PARITY;
> +	if (!(termios->c_cflag & PARODD))
> +		cval |= UART_LCR_EPAR;
> +
> +	/*
> +	 * Ask the core to calculate the divisor for us.
> +	 */
> +
> +	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
> +	quot = serial_omap_get_divisor(port, baud);
> +
> +	up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
> +			UART_FCR_ENABLE_FIFO;
> +	if (up->use_dma)
> +		up->fcr |= UART_FCR_DMA_SELECT;
> +
> +	/*
> +	 * Ok, we're now changing the port state. Do it with
> +	 * interrupts disabled.
> +	 */
> +	spin_lock_irqsave(&up->port.lock, flags);
> +
> +	/*
> +	 * Update the per-port timeout.
> +	 */
> +	uart_update_timeout(port, termios->c_cflag, baud);
> +
> +	up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
> +	if (termios->c_iflag & INPCK)
> +		up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
> +	if (termios->c_iflag & (BRKINT | PARMRK))
> +		up->port.read_status_mask |= UART_LSR_BI;
> +
> +	/*
> +	 * Characters to ignore
> +	 */
> +	up->port.ignore_status_mask = 0;
> +	if (termios->c_iflag & IGNPAR)
> +		up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
> +	if (termios->c_iflag & IGNBRK) {
> +		up->port.ignore_status_mask |= UART_LSR_BI;
> +		/*
> +		 * If we're ignoring parity and break indicators,
> +		 * ignore overruns too (for real raw support).
> +		 */
> +		if (termios->c_iflag & IGNPAR)
> +			up->port.ignore_status_mask |= UART_LSR_OE;
> +	}
> +
> +	/*
> +	 * ignore all characters if CREAD is not set
> +	 */
> +	if ((termios->c_cflag & CREAD) == 0)
> +		up->port.ignore_status_mask |= UART_LSR_DR;
> +
> +	/*
> +	 * Modem status interrupts
> +	 */
> +	up->ier &= ~UART_IER_MSI;
> +	if (UART_ENABLE_MS(&up->port, termios->c_cflag))
> +		up->ier |= UART_IER_MSI;
> +	serial_out(up, UART_IER, up->ier);
> +	serial_out(up, UART_LCR, cval);		/* reset DLAB */
> +
> +	/* FIFOs and DMA Settings */
> +
> +	/* FCR can be changed only when the
> +	 * baud clock is not running
> +	 * DLL_REG and DLH_REG set to 0.
> +	 */
> +	serial_out(up, UART_LCR, UART_LCR_DLAB);
> +	serial_out(up, UART_DLL, 0);
> +	serial_out(up, UART_DLM, 0);
> +	serial_out(up, UART_LCR, 0);
> +
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> +	up->efr = serial_in(up, UART_EFR);
> +	serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
> +
> +	serial_out(up, UART_LCR, 0);
> +	up->mcr = serial_in(up, UART_MCR);
> +	serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
> +	/* FIFO ENABLE, DMA MODE */
> +	serial_out(up, UART_FCR, up->fcr);
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> +	if (up->use_dma) {
> +		serial_out(up, UART_TI752_TLR, 0);
> +		serial_out(up, UART_OMAP_SCR,
> +			(UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8));
> +	}
> +
> +	serial_out(up, UART_EFR, up->efr);
> +	serial_out(up, UART_LCR, UART_LCR_DLAB);
> +	serial_out(up, UART_MCR, up->mcr);
> +
> +	/* Protocol, Baud Rate, and Interrupt Settings */
> +
> +	serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_DISABLE);
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> +	up->efr = serial_in(up, UART_EFR);
> +	serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
> +
> +	serial_out(up, UART_LCR, 0);
> +	serial_out(up, UART_IER, 0);
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> +	serial_out(up, UART_DLL, quot & 0xff);          /* LS of divisor */
> +	serial_out(up, UART_DLM, quot >> 8);            /* MS of divisor */
> +
> +	serial_out(up, UART_LCR, 0);
> +	serial_out(up, UART_IER, up->ier);
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> +	serial_out(up, UART_EFR, up->efr);
> +	serial_out(up, UART_LCR, cval);
> +
> +	if (baud > 230400 && baud != 3000000)
> +		serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_MODE13X);
> +	else
> +		serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_MODE16X);
> +
> +	/* Hardware Flow Control Configuration */
> +
> +	if (termios->c_cflag & CRTSCTS) {
> +		efr |= (UART_EFR_CTS | UART_EFR_RTS);
> +		serial_out(up, UART_LCR, UART_LCR_DLAB);
> +
> +		up->mcr = serial_in(up, UART_MCR);
> +		serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
> +
> +		serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +		up->efr = serial_in(up, UART_EFR);
> +		serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
> +
> +		serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
> +		serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */
> +		serial_out(up, UART_LCR, UART_LCR_DLAB);
> +		serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
> +		serial_out(up, UART_LCR, cval);
> +	}
> +
> +	serial_omap_set_mctrl(&up->port, up->port.mctrl);
> +	/* Software Flow Control Configuration */
> +	if (termios->c_iflag & (IXON | IXOFF))
> +		serial_omap_configure_xonxoff(up, termios);
> +
> +	spin_unlock_irqrestore(&up->port.lock, flags);
> +	dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id);
> +}
> +
> +static void
> +serial_omap_pm(struct uart_port *port, unsigned int state,
> +	       unsigned int oldstate)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +	unsigned char efr;
> +
> +	dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id);
> +	efr = serial_in(up, UART_EFR);
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +	serial_out(up, UART_EFR, efr | UART_EFR_ECB);
> +	serial_out(up, UART_LCR, 0);
> +
> +	serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
> +	serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +	serial_out(up, UART_EFR, efr);
> +	serial_out(up, UART_LCR, 0);
> +	/* Enable module level wake up */
> +	serial_out(up, UART_OMAP_WER,
> +		(state != 0) ? OMAP_UART_WER_MOD_WKUP : 0);
> +}
> +
> +static void serial_omap_release_port(struct uart_port *port)
> +{
> +	dev_dbg(port->dev, "serial_omap_release_port+\n");
> +}
> +
> +static int serial_omap_request_port(struct uart_port *port)
> +{
> +	dev_dbg(port->dev, "serial_omap_request_port+\n");
> +	return 0;
> +}
> +
> +static void serial_omap_config_port(struct uart_port *port, int flags)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> +	dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
> +							up->pdev->id);
> +	up->port.type = PORT_OMAP;
> +}
> +
> +static int
> +serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
> +{
> +	/* we don't want the core code to modify any port params */
> +	dev_dbg(port->dev, "serial_omap_verify_port+\n");
> +	return -EINVAL;
> +}
> +
> +static const char *
> +serial_omap_type(struct uart_port *port)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> +	dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id);
> +	return up->name;
> +}
> +
> +#ifdef CONFIG_SERIAL_OMAP_CONSOLE
> +
> +static struct uart_omap_port *serial_omap_console_ports[4];
> +
> +static struct uart_driver serial_omap_reg;
> +
> +#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
> +
> +static inline void wait_for_xmitr(struct uart_omap_port *up)
> +{
> +	unsigned int status, tmout = 10000;
> +
> +	/* Wait up to 10ms for the character(s) to be sent. */
> +	do {
> +		status = serial_in(up, UART_LSR);
> +
> +		if (status & UART_LSR_BI)
> +			up->lsr_break_flag = UART_LSR_BI;
> +
> +		if (--tmout == 0)
> +			break;
> +		udelay(1);
> +	} while ((status & BOTH_EMPTY) != BOTH_EMPTY);
> +
> +	/* Wait up to 1s for flow control if necessary */
> +	if (up->port.flags & UPF_CONS_FLOW) {
> +		tmout = 1000000;
> +		for (tmout = 1000000; tmout; tmout--) {
> +			unsigned int msr = serial_in(up, UART_MSR);
> +			up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
> +			if (msr & UART_MSR_CTS)
> +				break;
> +			udelay(1);
> +		}
> +	}
> +}
> +
> +static void serial_omap_console_putchar(struct uart_port *port, int ch)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> +	wait_for_xmitr(up);
> +	serial_out(up, UART_TX, ch);
> +}
> +
> +static void
> +serial_omap_console_write(struct console *co, const char *s,
> +		unsigned int count)
> +{
> +	struct uart_omap_port *up = serial_omap_console_ports[co->index];
> +	unsigned int ier;
> +
> +	/*
> +	 * First save the IER then disable the interrupts
> +	 */
> +	ier = serial_in(up, UART_IER);
> +	serial_out(up, UART_IER, 0);
> +
> +	uart_console_write(&up->port, s, count, serial_omap_console_putchar);
> +
> +	/*
> +	 * Finally, wait for transmitter to become empty
> +	 * and restore the IER
> +	 */
> +	wait_for_xmitr(up);
> +	serial_out(up, UART_IER, ier);
> +	/*
> +	 * The receive handling will happen properly because the
> +	 * receive ready bit will still be set; it is not cleared
> +	 * on read.  However, modem control will not, we must
> +	 * call it if we have saved something in the saved flags
> +	 * while processing with interrupts off.
> +	 */
> +	if (up->msr_saved_flags)
> +		check_modem_status(up);
> +}
> +
> +static int __init
> +serial_omap_console_setup(struct console *co, char *options)
> +{
> +	struct uart_omap_port *up;
> +	int baud = 115200;
> +	int bits = 8;
> +	int parity = 'n';
> +	int flow = 'n';
> +	int r;
> +
> +	if (serial_omap_console_ports[co->index] == NULL)
> +		return -ENODEV;
> +	up = serial_omap_console_ports[co->index];
> +
> +	if (options)
> +		uart_parse_options(options, &baud, &parity, &bits, &flow);
> +
> +	r = uart_set_options(&up->port, co, baud, parity, bits, flow);
> +
> +	return r;
> +}
> +
> +static struct console serial_omap_console = {
> +	.name		= OMAP_SERIAL_NAME,
> +	.write		= serial_omap_console_write,
> +	.device		= uart_console_device,
> +	.setup		= serial_omap_console_setup,
> +	.flags		= CON_PRINTBUFFER,
> +	.index		= -1,
> +	.data		= &serial_omap_reg,
> +};
> +
> +static void serial_omap_add_console_port(struct uart_omap_port *up)
> +{
> +	serial_omap_console_ports[up->pdev->id] = up;
> +}
> +
> +#define OMAP_CONSOLE	(&serial_omap_console)
> +
> +#else
> +
> +#define OMAP_CONSOLE	NULL
> +
> +static inline void serial_omap_add_console_port(struct uart_omap_port *up)
> +{}
> +
> +#endif
> +
> +struct uart_ops serial_omap_pops = {
> +	.tx_empty	= serial_omap_tx_empty,
> +	.set_mctrl	= serial_omap_set_mctrl,
> +	.get_mctrl	= serial_omap_get_mctrl,
> +	.stop_tx	= serial_omap_stop_tx,
> +	.start_tx	= serial_omap_start_tx,
> +	.stop_rx	= serial_omap_stop_rx,
> +	.enable_ms	= serial_omap_enable_ms,
> +	.break_ctl	= serial_omap_break_ctl,
> +	.startup	= serial_omap_startup,
> +	.shutdown	= serial_omap_shutdown,
> +	.set_termios	= serial_omap_set_termios,
> +	.pm		= serial_omap_pm,
> +	.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,
> +};
> +
> +static struct uart_driver serial_omap_reg = {
> +	.owner		= THIS_MODULE,
> +	.driver_name	= "OMAP-SERIAL",
> +	.dev_name	= OMAP_SERIAL_NAME,
> +	.nr		= OMAP_MAX_HSUART_PORTS,
> +	.cons		= OMAP_CONSOLE,
> +};
> +
> +static int
> +serial_omap_suspend(struct platform_device *pdev, pm_message_t state)
> +{
> +	struct uart_omap_port *up = platform_get_drvdata(pdev);
> +
> +	if (up)
> +		uart_suspend_port(&serial_omap_reg, &up->port);
> +	return 0;
> +}
> +
> +static int serial_omap_resume(struct platform_device *dev)
> +{
> +	struct uart_omap_port *up = platform_get_drvdata(dev);
> +
> +	if (up)
> +		uart_resume_port(&serial_omap_reg, &up->port);
> +	return 0;
> +}
> +
> +static void serial_omap_rx_timeout(unsigned long uart_no)
> +{
> +	struct uart_omap_port *up = ui[uart_no];
> +	unsigned int curr_dma_pos, curr_transmitted_size;
> +	unsigned int ret = 0;
> +
> +	curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
> +	if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
> +			     (curr_dma_pos == 0)) {
> +		if (jiffies_to_msecs(jiffies - up->port_activity) <
> +							RX_TIMEOUT) {
> +			mod_timer(&up->uart_dma.rx_timer, jiffies +
> +				usecs_to_jiffies(up->uart_dma.rx_timeout));
> +		} else {
> +			serial_omap_stop_rxdma(up);
> +			up->ier |= UART_IER_RDI;
> +			serial_out(up, UART_IER, up->ier);
> +		}
> +		return;
> +	}
> +
> +	curr_transmitted_size = curr_dma_pos -
> +					up->uart_dma.prev_rx_dma_pos;
> +	up->port.icount.rx += curr_transmitted_size;
> +	tty_insert_flip_string(up->port.state->port.tty,
> +			up->uart_dma.rx_buf +
> +			(up->uart_dma.prev_rx_dma_pos -
> +			up->uart_dma.rx_buf_dma_phys),
> +			curr_transmitted_size);
> +	tty_flip_buffer_push(up->port.state->port.tty);
> +	up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
> +	if (up->uart_dma.rx_buf_size +
> +			up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
> +		ret = serial_omap_start_rxdma(up);
> +		if (ret < 0) {
> +			serial_omap_stop_rxdma(up);
> +			up->ier |= UART_IER_RDI;
> +			serial_out(up, UART_IER, up->ier);
> +		}
> +	} else  {
> +		mod_timer(&up->uart_dma.rx_timer, jiffies +
> +			usecs_to_jiffies(up->uart_dma.rx_timeout));
> +	}
> +	up->port_activity = jiffies;
> +}
> +
> +static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
> +{
> +	return;
> +}
> +
> +static int serial_omap_start_rxdma(struct uart_omap_port *up)
> +{
> +	int ret = 0;
> +
> +	if (up->uart_dma.rx_dma_channel == -1) {
> +		ret = omap_request_dma(up->uart_dma.uart_dma_rx,
> +				"UART Rx DMA",
> +				(void *)uart_rx_dma_callback, up,
> +				&(up->uart_dma.rx_dma_channel));
> +		if (ret < 0)
> +			return ret;
> +
> +		omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
> +				OMAP_DMA_AMODE_CONSTANT,
> +				up->uart_dma.uart_base, 0, 0);
> +		omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
> +				OMAP_DMA_AMODE_POST_INC,
> +				up->uart_dma.rx_buf_dma_phys, 0, 0);
> +		omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
> +				OMAP_DMA_DATA_TYPE_S8,
> +				up->uart_dma.rx_buf_size, 1,
> +				OMAP_DMA_SYNC_ELEMENT,
> +				up->uart_dma.uart_dma_rx, 0);
> +	}
> +	up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
> +	/* FIXME: Cache maintenance needed here? */
> +	omap_start_dma(up->uart_dma.rx_dma_channel);
> +	mod_timer(&up->uart_dma.rx_timer, jiffies +
> +				usecs_to_jiffies(up->uart_dma.rx_timeout));
> +	up->uart_dma.rx_dma_used = true;
> +	return ret;
> +}
> +
> +static void serial_omap_continue_tx(struct uart_omap_port *up)
> +{
> +	struct circ_buf *xmit = &up->port.state->xmit;
> +	int start = up->uart_dma.tx_buf_dma_phys
> +			+ (xmit->tail & (UART_XMIT_SIZE - 1));
> +
> +	if (uart_circ_empty(xmit))
> +		return;
> +
> +	up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
> +	/*
> +	 * It is a circular buffer. See if the buffer has wounded back.
> +	 * If yes it will have to be transferred in two separate dma
> +	 * transfers
> +	 */
> +	if (start + up->uart_dma.tx_buf_size >=
> +			up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
> +		up->uart_dma.tx_buf_size =
> +			(up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
> +	omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
> +				OMAP_DMA_AMODE_CONSTANT,
> +				up->uart_dma.uart_base, 0, 0);
> +	omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
> +				OMAP_DMA_AMODE_POST_INC, start, 0, 0);
> +	omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
> +				OMAP_DMA_DATA_TYPE_S8,
> +				up->uart_dma.tx_buf_size, 1,
> +				OMAP_DMA_SYNC_ELEMENT,
> +				up->uart_dma.uart_dma_tx, 0);
> +	/* FIXME: Cache maintenance needed here? */
> +	omap_start_dma(up->uart_dma.tx_dma_channel);
> +}
> +
> +static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
> +{
> +	struct uart_omap_port *up = (struct uart_omap_port *)data;
> +	struct circ_buf *xmit = &up->port.state->xmit;
> +
> +	xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \
> +			(UART_XMIT_SIZE - 1);
> +	up->port.icount.tx += up->uart_dma.tx_buf_size;
> +
> +	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
> +		uart_write_wakeup(&up->port);
> +
> +	if (uart_circ_empty(xmit)) {
> +		spin_lock(&(up->uart_dma.tx_lock));
> +		serial_omap_stop_tx(&up->port);
> +		up->uart_dma.tx_dma_used = false;
> +		spin_unlock(&(up->uart_dma.tx_lock));
> +	} else {
> +		omap_stop_dma(up->uart_dma.tx_dma_channel);
> +		serial_omap_continue_tx(up);
> +	}
> +	up->port_activity = jiffies;
> +	return;
> +}
> +
> +static int serial_omap_probe(struct platform_device *pdev)
> +{
> +	struct uart_omap_port	*up;
> +	struct resource		*mem, *irq, *dma_tx, *dma_rx;
> +	struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
> +	int ret = -ENOSPC;
> +
> +	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 (!request_mem_region(mem->start, (mem->end - mem->start) + 1,
> +				     pdev->dev.driver->name)) {
> +		dev_err(&pdev->dev, "memory region already claimed\n");
> +		return -EBUSY;
> +	}
> +
> +	dma_tx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
> +	if (!dma_tx) {
> +		ret = -EINVAL;
> +		goto err;
> +	}
> +
> +	dma_rx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
> +	if (!dma_rx) {
> +		ret = -EINVAL;
> +		goto err;
> +	}
> +
> +	up = kzalloc(sizeof(*up), GFP_KERNEL);
> +	if (up == NULL) {
> +		ret = -ENOMEM;
> +		goto do_release_region;
> +	}
> +	sprintf(up->name, "OMAP UART%d", pdev->id);
> +	up->pdev = pdev;
> +	up->port.dev = &pdev->dev;
> +	up->port.type = PORT_OMAP;
> +	up->port.iotype = UPIO_MEM;
> +	up->port.irq = irq->start;
> +	if (cpu_is_omap44xx())
> +		up->port.irq += 32;
> +
> +	up->port.regshift = 2;
> +	up->port.fifosize = 64;
> +	up->port.ops = &serial_omap_pops;
> +	up->port.line = pdev->id;
> +
> +	up->port.membase = omap_up_info->membase;
> +	up->port.mapbase = omap_up_info->mapbase;
> +	up->port.flags = omap_up_info->flags;
> +	up->port.irqflags = omap_up_info->irqflags;
> +	up->port.uartclk = omap_up_info->uartclk;
> +	up->uart_dma.uart_base = mem->start;
> +
> +	if (omap_up_info->dma_enabled) {
> +		up->uart_dma.uart_dma_tx = dma_tx->start;
> +		up->uart_dma.uart_dma_rx = dma_rx->start;
> +		up->use_dma = 1;
> +		up->uart_dma.rx_buf_size = 4096;
> +		up->uart_dma.rx_timeout = 1;
> +		spin_lock_init(&(up->uart_dma.tx_lock));
> +		spin_lock_init(&(up->uart_dma.rx_lock));
> +		up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
> +		up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
> +	}
> +
> +	ui[pdev->id] = up;
> +	serial_omap_add_console_port(up);
> +
> +	ret = uart_add_one_port(&serial_omap_reg, &up->port);
> +	if (ret != 0)
> +		goto do_release_region;
> +
> +	platform_set_drvdata(pdev, up);
> +	return 0;
> +err:
> +	dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
> +				pdev->id, __func__, ret);
> +do_release_region:
> +	release_mem_region(mem->start, (mem->end - mem->start) + 1);
> +	return ret;
> +}
> +
> +static int serial_omap_remove(struct platform_device *dev)
> +{
> +	struct uart_omap_port *up = platform_get_drvdata(dev);
> +
> +	platform_set_drvdata(dev, NULL);
> +	if (up) {
> +		uart_remove_one_port(&serial_omap_reg, &up->port);
> +		kfree(up);
> +	}
> +	return 0;
> +}
> +
> +static struct platform_driver serial_omap_driver = {
> +	.probe          = serial_omap_probe,
> +	.remove         = serial_omap_remove,
> +
> +	.suspend	= serial_omap_suspend,
> +	.resume		= serial_omap_resume,
> +	.driver		= {
> +		.name	= DRIVER_NAME,
> +	},
> +};
> +
> +int __init serial_omap_init(void)
> +{
> +	int ret;
> +
> +	ret = uart_register_driver(&serial_omap_reg);
> +	if (ret != 0)
> +		return ret;
> +	ret = platform_driver_register(&serial_omap_driver);
> +	if (ret != 0)
> +		uart_unregister_driver(&serial_omap_reg);
> +	return ret;
> +}
> +
> +void __exit serial_omap_exit(void)
> +{
> +	platform_driver_unregister(&serial_omap_driver);
> +	uart_unregister_driver(&serial_omap_reg);
> +}
> +
> +module_init(serial_omap_init);
> +module_exit(serial_omap_exit);
> +
> +MODULE_DESCRIPTION("OMAP High Speed UART driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Texas Instruments Inc");
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 8c3dd36..e02b945 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -182,6 +182,9 @@
>  /* Aeroflex Gaisler GRLIB APBUART */
>  #define PORT_APBUART    90
>
> +/* TI OMAP-UART */
> +#define PORT_OMAP	91
> +
>  #ifdef __KERNEL__
>
>  #include <linux/compiler.h>
> --
> 1.6.3.3
>
>


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