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Commit 01732dd2 authored by Robert Baldyga's avatar Robert Baldyga Committed by Greg Kroah-Hartman
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serial: samsung: introduce s3c24xx_serial_rx_drain_fifo() function 



This patch introduces s3c24xx_serial_rx_drain_fifo() which reads data
from RX FIFO and writes it to tty buffer. It also checks for special
conditions (such as 'break') and handles it. This function has been
separated from s3c24xx_serial_rx_chars_pio() as it contains code which
can be used also in DMA mode.

Signed-off-by: default avatarRobert Baldyga <r.baldyga@samsung.com>
Reviewed-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 620bb214

drivers/tty/serial/samsung.c

+13 −10
Original line number Diff line number Diff line
@@ -621,16 +621,12 @@ static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id) 
	return IRQ_HANDLED;

}



static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)

static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)

{

	struct s3c24xx_uart_port *ourport = dev_id;

	struct uart_port *port = &ourport->port;

	unsigned int ufcon, ch, flag, ufstat, uerstat;

	unsigned long flags;

	int max_count = port->fifosize;



	spin_lock_irqsave(&port->lock, flags);



	while (max_count-- > 0) {

		ufcon = rd_regl(port, S3C2410_UFCON);

		ufstat = rd_regl(port, S3C2410_UFSTAT);
@@ -654,9 +650,7 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id) 
					ufcon |= S3C2410_UFCON_RESETRX;

					wr_regl(port, S3C2410_UFCON, ufcon);

					rx_enabled(port) = 1;

					spin_unlock_irqrestore(&port->lock,

							flags);

					goto out;

					return;

				}

				continue;

			}
@@ -702,10 +696,19 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id) 
				 ch, flag);

	}



	spin_unlock_irqrestore(&port->lock, flags);

	tty_flip_buffer_push(&port->state->port);

}



static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)

{

	struct s3c24xx_uart_port *ourport = dev_id;

	struct uart_port *port = &ourport->port;

	unsigned long flags;



	spin_lock_irqsave(&port->lock, flags);

	s3c24xx_serial_rx_drain_fifo(ourport);

	spin_unlock_irqrestore(&port->lock, flags);



out:

	return IRQ_HANDLED;

}