C++ (Cpp) serial8250_tx_dma示例

示例#1

文件： 8250_dma.c 项目： Announcement/linux

static void __dma_tx_complete(void *param)
{
	struct uart_8250_port	*p = param;
	struct uart_8250_dma	*dma = p->dma;
	struct circ_buf		*xmit = &p->port.state->xmit;
	unsigned long	flags;
	int		ret;

	dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr,
				UART_XMIT_SIZE, DMA_TO_DEVICE);

	spin_lock_irqsave(&p->port.lock, flags);

	dma->tx_running = 0;

	xmit->tail += dma->tx_size;
	xmit->tail &= UART_XMIT_SIZE - 1;
	p->port.icount.tx += dma->tx_size;

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(&p->port);

	ret = serial8250_tx_dma(p);
	if (ret) {
		p->ier |= UART_IER_THRI;
		serial_port_out(&p->port, UART_IER, p->ier);
	}

	spin_unlock_irqrestore(&p->port.lock, flags);
}

示例#2

文件： 8250_dma.c 项目： AD5GB/kernel_n5_3.10-experimental

static void __dma_tx_complete(void *param)
{
	struct uart_8250_port	*p = param;
	struct uart_8250_dma	*dma = p->dma;
	struct circ_buf		*xmit = &p->port.state->xmit;

	dma->tx_running = 0;

	dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr,
				UART_XMIT_SIZE, DMA_TO_DEVICE);

	xmit->tail += dma->tx_size;
	xmit->tail &= UART_XMIT_SIZE - 1;
	p->port.icount.tx += dma->tx_size;

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(&p->port);

	if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port))
		serial8250_tx_dma(p);
}