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C++ serial_omap_port_enable函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中serial_omap_port_enable函数的典型用法代码示例。如果您正苦于以下问题：C++ serial_omap_port_enable函数的具体用法？C++ serial_omap_port_enable怎么用？C++ serial_omap_port_enable使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了serial_omap_port_enable函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: serial_omap_stop_tx

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;
		serial_omap_port_disable(up);
	}

	serial_omap_port_enable(up);
	if (up->ier & UART_IER_THRI) {
		up->ier &= ~UART_IER_THRI;
		serial_out(up, UART_IER, up->ier);
	}

	serial_omap_port_disable(up);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:26，代码来源:omap-serial.c


示例2: serial_omap_pm

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;
	unsigned char lcr;

	dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id);

	serial_omap_port_enable(up);
	lcr = serial_in(up, UART_LCR);
	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
	efr = serial_in(up, UART_EFR);
	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, UART_LCR_CONF_MODE_B);
	serial_out(up, UART_EFR, efr);
	serial_out(up, UART_LCR, lcr);
	if (state)
		pm_runtime_put_sync(&up->pdev->dev);
	else
		serial_omap_port_disable(up);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:26，代码来源:omap-serial.c


示例3: serial_omap_start_rxdma

static int serial_omap_start_rxdma(struct uart_omap_port *up)
{
	int ret = 0;

	if (up->uart_dma.rx_dma_channel == -1) {
		serial_omap_port_enable(up);
		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_poll_rate));
	up->uart_dma.rx_dma_used = true;
	return ret;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:33，代码来源:omap-serial.c


示例4: serial_omap_poll_put_char

static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
{
	struct uart_omap_port *up = (struct uart_omap_port *)port;

	serial_omap_port_enable(up);
	wait_for_xmitr(up);
	serial_out(up, UART_TX, ch);
	serial_omap_port_disable(up);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:9，代码来源:omap-serial.c


示例5: serial_omap_enable_ms

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);

	serial_omap_port_enable(up);
	up->ier |= UART_IER_MSI;
	serial_out(up, UART_IER, up->ier);
	serial_omap_port_disable(up);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:11，代码来源:omap-serial.c


示例6: serial_omap_stop_rx

static void serial_omap_stop_rx(struct uart_port *port)
{
	struct uart_omap_port *up = (struct uart_omap_port *)port;

	serial_omap_port_enable(up);
	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);
	serial_omap_port_disable(up);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:12，代码来源:omap-serial.c


示例7: omap_uart_wake

int omap_uart_wake(u8 uart_num)
{
	if (uart_num > OMAP_MAX_HSUART_PORTS)
		return -ENODEV;

	if (!ui[uart_num - 1])
		return -ENODEV;

	serial_omap_port_enable(ui[uart_num - 1]);
	serial_omap_port_disable(ui[uart_num - 1]);

	return 0;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:13，代码来源:omap-serial.c


示例8: serial_omap_poll_get_char

static int serial_omap_poll_get_char(struct uart_port *port)
{
	struct uart_omap_port *up = (struct uart_omap_port *)port;
	unsigned int status;

	serial_omap_port_enable(up);
	status = serial_in(up, UART_LSR);
	if (!(status & UART_LSR_DR))
		return NO_POLL_CHAR;

	status = serial_in(up, UART_RX);
	serial_omap_port_disable(up);
	return status;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:14，代码来源:omap-serial.c


示例9: omap_serial_ext_uart_enable

/* Used by ext client device connected to uart to control uart */
int omap_serial_ext_uart_enable(u8 port_id)
{
	struct uart_omap_port *up;
	int err = 0;

	if (port_id > OMAP_MAX_HSUART_PORTS) {
		pr_err("Invalid Port_id %d passed to %s\n", port_id, __func__);
		err = -ENODEV;
	} else {
		up = ui[port_id];
		serial_omap_port_enable(up);
	}
	return err;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:15，代码来源:omap-serial.c


示例10: serial_omap_tx_empty

//static unsigned int serial_omap_tx_empty(struct uart_port *port)
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;

	serial_omap_port_enable(up);
	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);
	serial_omap_port_disable(up);
	return ret;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:15，代码来源:omap-serial.c


示例11: serial_omap_irq

/**
 * 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 int int_id;
	unsigned long flags;
	int ret = IRQ_HANDLED;
	u8 tx_fifo_lvl;

	serial_omap_port_enable(up);
	iir = serial_in(up, UART_IIR);
	if (iir & UART_IIR_NO_INT) {
		serial_omap_port_disable(up);
		return IRQ_NONE;
	}

	int_id = iir & UART_OMAP_IIR_ID;

	spin_lock_irqsave(&up->port.lock, flags);
	lsr = serial_in(up, UART_LSR);
	if (int_id == UART_IIR_RDI || int_id == UART_OMAP_IIR_RX_TIMEOUT ||
	    int_id == UART_IIR_RLSI) {
		if (!up->use_dma) {
			if (lsr & UART_LSR_DR)
				receive_chars(up, &lsr);
		} else {
			up->ier &= ~(UART_IER_RDI | UART_IER_RLSI);
			serial_out(up, UART_IER, up->ier);
			if ((serial_omap_start_rxdma(up) != 0) &&
					(lsr & UART_LSR_DR))
				receive_chars(up, &lsr);
		}
	}

	check_modem_status(up);
	if (int_id == UART_IIR_THRI) {
		tx_fifo_lvl = serial_in(up, UART_OMAP_TXFIFO_LVL);
		if (lsr & UART_LSR_THRE || tx_fifo_lvl < up->port.fifosize)
			transmit_chars(up, tx_fifo_lvl);
		else
			ret = IRQ_NONE;
	}

	spin_unlock_irqrestore(&up->port.lock, flags);
	serial_omap_port_disable(up);

	up->port_activity = jiffies;
	return ret;
}
开发者ID:kf-otterx，项目名称:kernel_omap_otter-common，代码行数:54，代码来源:omap-serial.c


示例12: serial_omap_break_ctl

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);
	serial_omap_port_enable(up);
	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);
	serial_omap_port_disable(up);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:16，代码来源:omap-serial.c


示例13: serial_omap_shutdown

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);

	serial_omap_port_enable(up);
	/*
	 * Disable interrupts & wakeup events from this port
	 */
	up->ier = 0;
	up->wer_restore = 0;
	serial_out(up, UART_OMAP_WER, 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) {
		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;
	}
	serial_omap_port_disable(up);
	free_irq(up->port.irq, up);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:46，代码来源:omap-serial.c


示例14: serial_omap_resume

static int serial_omap_resume(struct device *dev)
{
	struct uart_omap_port *up = dev_get_drvdata(dev);

	if (up) {
		uart_resume_port(&serial_omap_reg, &up->port);
		up->suspended = false;
        serial_omap_port_enable(up);//add enable and disable to make sure RTS state right after resume
        if (up->rts_mux_driver_control && up->rts_pullup_in_suspend) {
            omap_rts_mux_write(0, up->port.line);
            up->rts_pullup_in_suspend = 0;
        }
        serial_omap_port_disable(up);
	}

	return 0;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:17，代码来源:omap-serial.c


示例15: omap_uart_resume_idle

/* TBD: Should be removed once we irq-chaining mechanism in place */
u32 omap_uart_resume_idle()
{
	int i;
	u32 ret = 0;

	for (i = 0; i < OMAP_MAX_HSUART_PORTS; i++) {
		struct uart_omap_port *up = ui[i];

		if (!up)
			continue;

		if (up->chk_wakeup(up->pdev)) {
			serial_omap_port_enable(up);
			serial_omap_port_disable(up);
			ret++;
		}
	}
	return ret;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:20，代码来源:omap-serial.c


示例16: serial_omap_get_mctrl

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;

	serial_omap_port_enable(up);
	status = check_modem_status(up);
	serial_omap_port_disable(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;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:22，代码来源:omap-serial.c


示例17: serial_omap_set_mctrl

//static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
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;

	serial_omap_port_enable(up);
	up->mcr = serial_in(up, UART_MCR);
	up->mcr |= mcr;
	serial_out(up, UART_MCR, up->mcr);
	serial_omap_port_disable(up);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:24，代码来源:omap-serial.c


示例18: serial_omap_set_termios

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 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->dll = quot & 0xff;
	up->dlh = quot >> 8;
	up->mdr1 = UART_OMAP_MDR1_DISABLE;

	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.
	 */
	serial_omap_port_enable(up);
	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 */
	up->lcr = cval;
	up->scr = OMAP_UART_SCR_TX_EMPTY;

	/* FIFOs and DMA Settings */
//.........这里部分代码省略.........
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:101，代码来源:omap-serial.c


示例19: serial_omap_startup

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);

	serial_omap_port_enable(up);
	/*
	 * 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);
	up->mcr = serial_in(up, UART_MCR);

	/*
	 * 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); //CTS status change before startup will be missed, no need  to clear

	/*
	 * 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_rxdma_poll;
		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);

	/* Enable module level wake up */
	up->wer_restore = up->wer;
	serial_out(up, UART_OMAP_WER, up->wer);

	serial_omap_port_disable(up);
	up->port_activity = jiffies;
	return 0;
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:78，代码来源:omap-serial.c


示例20: serial_omap_start_tx

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) {
		serial_omap_port_enable(up);
		serial_omap_enable_ier_thri(up);
		serial_omap_port_disable(up);
		return;
	}

	if (up->uart_dma.tx_dma_used)
		return;

	xmit = &up->port.state->xmit;

	if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) {
		serial_omap_port_enable(up);
		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;
		}
	}
	spin_lock(&(up->uart_dma.tx_lock));
	up->uart_dma.tx_dma_used = true;
	spin_unlock(&(up->uart_dma.tx_lock));

	start = up->uart_dma.tx_buf_dma_phys +
				(xmit->tail & (UART_XMIT_SIZE - 1));

	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);
}
开发者ID:manusreload，项目名称:android_kernel_huawei_omap4，代码行数:63，代码来源:omap-serial.c



注：本文中的serial_omap_port_enable函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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