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	/*
	* Copyright 2004-2011 Freescale Semiconductor, Inc. All Rights Reserved.
	*/
	/*
	* The code contained herein is licensed under the GNU General Public
	* License. You may obtain a copy of the GNU General Public License
	* Version 2 or later at the following locations:
	*
	* http://www.opensource.org/licenses/gpl-license.html
	* http://www.gnu.org/copyleft/gpl.html
	*/
	/*!
	* @file drivers/serial/mxc_uart.c
	*
	* @brief Driver for the Freescale Semiconductor MXC serial ports based on
	* drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
	*
	* @ingroup UART
	*/
	static void mxcuart_dma_writecallback(void *arg, int error, unsigned int count)
	{
	uart_mxc_port *umxc = arg;
	struct circ_buf *xmit = &umxc->port.state->xmit;
	int tx_num;
	if (error != MXC_DMA_TRANSFER_ERROR) {
	tx_num = count;
	umxc->port.icount.tx += tx_num;
	xmit->tail = (xmit->tail + tx_num) & (UART_XMIT_SIZE - 1);
	}
	dma_unmap_single(umxc->port.dev, umxc->tx_handle, TXDMA_BUFF_SIZE,
	DMA_TO_DEVICE);
	tx_num = uart_circ_chars_pending(xmit);
	if (tx_num > 0)
	mxcuart_dma_tx(umxc);
	else
	dma_list[umxc->port.line].dma_txchnl_inuse = 0;
	if (tx_num < WAKEUP_CHARS)
	uart_write_wakeup(&umxc->port);
	}

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