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Commit 4a818c43 authored by Stefan Agner's avatar Stefan Agner Committed by Greg Kroah-Hartman
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serial: fsl_lpuart: move DMA channel request to probe 



Move the DMA channel request to probe to avoid requesting the DMA
channel on each opening of the ttyLPx device. This also fixes a
potential issue that TX channel is not freed when only RX channel
allocation fails. The DMA channels are now handled independently,
so one could use UART with DMA only in TX direction for instance.

Signed-off-by: default avatarStefan Agner <stefan@agner.ch>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5f1437f6

drivers/tty/serial/fsl_lpuart.c

+44 −52
Original line number Diff line number Diff line
@@ -237,7 +237,8 @@ struct lpuart_port { 
	unsigned int		rxfifo_size;

	bool			lpuart32;



	bool			lpuart_dma_use;

	bool			lpuart_dma_tx_use;

	bool			lpuart_dma_rx_use;

	struct dma_chan		*dma_tx_chan;

	struct dma_chan		*dma_rx_chan;

	struct dma_async_tx_descriptor  *dma_tx_desc;
@@ -568,7 +569,7 @@ static void lpuart_start_tx(struct uart_port *port) 
	temp = readb(port->membase + UARTCR2);

	writeb(temp | UARTCR2_TIE, port->membase + UARTCR2);



	if (sport->lpuart_dma_use) {

	if (sport->lpuart_dma_tx_use) {

		if (!uart_circ_empty(xmit) && !sport->dma_tx_in_progress)

			lpuart_prepare_tx(sport);

	} else {
@@ -761,13 +762,13 @@ static irqreturn_t lpuart_int(int irq, void *dev_id) 
	crdma = readb(sport->port.membase + UARTCR5);



	if (sts & UARTSR1_RDRF && !(crdma & UARTCR5_RDMAS)) {

		if (sport->lpuart_dma_use)

		if (sport->lpuart_dma_rx_use)

			lpuart_prepare_rx(sport);

		else

			lpuart_rxint(irq, dev_id);

	}

	if (sts & UARTSR1_TDRE && !(crdma & UARTCR5_TDMAS)) {

		if (sport->lpuart_dma_use)

		if (sport->lpuart_dma_tx_use)

			lpuart_pio_tx(sport);

		else

			lpuart_txint(irq, dev_id);
@@ -950,26 +951,17 @@ static int lpuart_dma_tx_request(struct uart_port *port) 
{

	struct lpuart_port *sport = container_of(port,

					struct lpuart_port, port);

	struct dma_chan *tx_chan;

	struct dma_slave_config dma_tx_sconfig;

	dma_addr_t dma_bus;

	unsigned char *dma_buf;

	int ret;



	tx_chan  = dma_request_slave_channel(sport->port.dev, "tx");



	if (!tx_chan) {

		dev_err(sport->port.dev, "Dma tx channel request failed!\n");

		return -ENODEV;

	}



	dma_bus = dma_map_single(tx_chan->device->dev,

	dma_bus = dma_map_single(sport->dma_tx_chan->device->dev,

				sport->port.state->xmit.buf,

				UART_XMIT_SIZE, DMA_TO_DEVICE);



	if (dma_mapping_error(tx_chan->device->dev, dma_bus)) {

	if (dma_mapping_error(sport->dma_tx_chan->device->dev, dma_bus)) {

		dev_err(sport->port.dev, "dma_map_single tx failed\n");

		dma_release_channel(tx_chan);

		return -ENOMEM;

	}
@@ -978,16 +970,14 @@ static int lpuart_dma_tx_request(struct uart_port *port) 
	dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;

	dma_tx_sconfig.dst_maxburst = sport->txfifo_size;

	dma_tx_sconfig.direction = DMA_MEM_TO_DEV;

	ret = dmaengine_slave_config(tx_chan, &dma_tx_sconfig);

	ret = dmaengine_slave_config(sport->dma_tx_chan, &dma_tx_sconfig);



	if (ret < 0) {

		dev_err(sport->port.dev,

				"Dma slave config failed, err = %d\n", ret);

		dma_release_channel(tx_chan);

		return ret;

	}



	sport->dma_tx_chan = tx_chan;

	sport->dma_tx_buf_virt = dma_buf;

	sport->dma_tx_buf_bus = dma_bus;

	sport->dma_tx_in_progress = 0;
@@ -999,34 +989,24 @@ static int lpuart_dma_rx_request(struct uart_port *port) 
{

	struct lpuart_port *sport = container_of(port,

					struct lpuart_port, port);

	struct dma_chan *rx_chan;

	struct dma_slave_config dma_rx_sconfig;

	dma_addr_t dma_bus;

	unsigned char *dma_buf;

	int ret;



	rx_chan  = dma_request_slave_channel(sport->port.dev, "rx");



	if (!rx_chan) {

		dev_err(sport->port.dev, "Dma rx channel request failed!\n");

		return -ENODEV;

	}



	dma_buf = devm_kzalloc(sport->port.dev,

				FSL_UART_RX_DMA_BUFFER_SIZE, GFP_KERNEL);



	if (!dma_buf) {

		dev_err(sport->port.dev, "Dma rx alloc failed\n");

		dma_release_channel(rx_chan);

		return -ENOMEM;

	}



	dma_bus = dma_map_single(rx_chan->device->dev, dma_buf,

	dma_bus = dma_map_single(sport->dma_rx_chan->device->dev, dma_buf,

				FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);



	if (dma_mapping_error(rx_chan->device->dev, dma_bus)) {

	if (dma_mapping_error(sport->dma_rx_chan->device->dev, dma_bus)) {

		dev_err(sport->port.dev, "dma_map_single rx failed\n");

		dma_release_channel(rx_chan);

		return -ENOMEM;

	}
@@ -1034,16 +1014,14 @@ static int lpuart_dma_rx_request(struct uart_port *port) 
	dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;

	dma_rx_sconfig.src_maxburst = 1;

	dma_rx_sconfig.direction = DMA_DEV_TO_MEM;

	ret = dmaengine_slave_config(rx_chan, &dma_rx_sconfig);

	ret = dmaengine_slave_config(sport->dma_rx_chan, &dma_rx_sconfig);



	if (ret < 0) {

		dev_err(sport->port.dev,

				"Dma slave config failed, err = %d\n", ret);

		dma_release_channel(rx_chan);

		return ret;

	}



	sport->dma_rx_chan = rx_chan;

	sport->dma_rx_buf_virt = dma_buf;

	sport->dma_rx_buf_bus = dma_bus;

	sport->dma_rx_in_progress = 0;
@@ -1055,31 +1033,24 @@ static void lpuart_dma_tx_free(struct uart_port *port) 
{

	struct lpuart_port *sport = container_of(port,

					struct lpuart_port, port);

	struct dma_chan *dma_chan;



	dma_unmap_single(sport->port.dev, sport->dma_tx_buf_bus,

			UART_XMIT_SIZE, DMA_TO_DEVICE);

	dma_chan = sport->dma_tx_chan;

	sport->dma_tx_chan = NULL;



	sport->dma_tx_buf_bus = 0;

	sport->dma_tx_buf_virt = NULL;

	dma_release_channel(dma_chan);

}



static void lpuart_dma_rx_free(struct uart_port *port)

{

	struct lpuart_port *sport = container_of(port,

					struct lpuart_port, port);

	struct dma_chan *dma_chan;



	dma_unmap_single(sport->port.dev, sport->dma_rx_buf_bus,

			FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);



	dma_chan = sport->dma_rx_chan;

	sport->dma_rx_chan = NULL;

	sport->dma_rx_buf_bus = 0;

	sport->dma_rx_buf_virt = NULL;

	dma_release_channel(dma_chan);

}



static int lpuart_startup(struct uart_port *port)
@@ -1098,17 +1069,21 @@ static int lpuart_startup(struct uart_port *port) 
	sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) &

		UARTPFIFO_FIFOSIZE_MASK) + 1);



	/* Whether use dma support by dma request results */

	if (lpuart_dma_tx_request(port) || lpuart_dma_rx_request(port)) {

		sport->lpuart_dma_use = false;

	} else {

		sport->lpuart_dma_use = true;

	if (sport->dma_rx_chan && !lpuart_dma_rx_request(port)) {

		sport->lpuart_dma_rx_use = true;

		setup_timer(&sport->lpuart_timer, lpuart_timer_func,

			    (unsigned long)sport);

	} else

		sport->lpuart_dma_rx_use = false;





	if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {

		sport->lpuart_dma_tx_use = true;

		temp = readb(port->membase + UARTCR5);

		temp &= ~UARTCR5_RDMAS;

		writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);

	}

	} else

		sport->lpuart_dma_tx_use = false;



	ret = devm_request_irq(port->dev, port->irq, lpuart_int, 0,

				DRIVER_NAME, sport);
@@ -1179,12 +1154,13 @@ static void lpuart_shutdown(struct uart_port *port) 


	devm_free_irq(port->dev, port->irq, sport);



	if (sport->lpuart_dma_use) {

	if (sport->lpuart_dma_rx_use) {

		lpuart_dma_rx_free(&sport->port);

		del_timer_sync(&sport->lpuart_timer);



		lpuart_dma_tx_free(port);

		lpuart_dma_rx_free(port);

	}



	if (sport->lpuart_dma_tx_use)

		lpuart_dma_tx_free(&sport->port);

}



static void lpuart32_shutdown(struct uart_port *port)
@@ -1306,7 +1282,7 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios, 
	/* update the per-port timeout */

	uart_update_timeout(port, termios->c_cflag, baud);



	if (sport->lpuart_dma_use) {

	if (sport->lpuart_dma_rx_use) {

		/* Calculate delay for 1.5 DMA buffers */

		sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *

					FSL_UART_RX_DMA_BUFFER_SIZE * 3 /
@@ -1835,6 +1811,16 @@ static int lpuart_probe(struct platform_device *pdev) 
		return ret;

	}



	sport->dma_tx_chan = dma_request_slave_channel(sport->port.dev, "tx");

	if (!sport->dma_tx_chan)

		dev_info(sport->port.dev, "DMA tx channel request failed, "

				"operating without tx DMA\n");



	sport->dma_rx_chan = dma_request_slave_channel(sport->port.dev, "rx");

	if (!sport->dma_rx_chan)

		dev_info(sport->port.dev, "DMA rx channel request failed, "

				"operating without rx DMA\n");



	return 0;

}
@@ -1846,6 +1832,12 @@ static int lpuart_remove(struct platform_device *pdev) 


	clk_disable_unprepare(sport->clk);



	if (sport->dma_tx_chan)

		dma_release_channel(sport->dma_tx_chan);



	if (sport->dma_rx_chan)

		dma_release_channel(sport->dma_rx_chan);



	return 0;

}