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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: Robert Baldyga <r.baldyga@samsung.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
620bb21448
commit
01732dd25c
1 changed files with 13 additions and 10 deletions
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@ -621,16 +621,12 @@ static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
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return IRQ_HANDLED;
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}
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static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
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static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
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{
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struct s3c24xx_uart_port *ourport = dev_id;
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struct uart_port *port = &ourport->port;
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unsigned int ufcon, ch, flag, ufstat, uerstat;
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unsigned long flags;
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int max_count = port->fifosize;
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spin_lock_irqsave(&port->lock, flags);
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while (max_count-- > 0) {
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ufcon = rd_regl(port, S3C2410_UFCON);
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ufstat = rd_regl(port, S3C2410_UFSTAT);
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@ -654,9 +650,7 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
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ufcon |= S3C2410_UFCON_RESETRX;
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wr_regl(port, S3C2410_UFCON, ufcon);
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rx_enabled(port) = 1;
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spin_unlock_irqrestore(&port->lock,
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flags);
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goto out;
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return;
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}
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continue;
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}
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@ -702,10 +696,19 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
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ch, flag);
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}
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spin_unlock_irqrestore(&port->lock, flags);
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tty_flip_buffer_push(&port->state->port);
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}
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static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
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{
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struct s3c24xx_uart_port *ourport = dev_id;
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struct uart_port *port = &ourport->port;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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s3c24xx_serial_rx_drain_fifo(ourport);
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spin_unlock_irqrestore(&port->lock, flags);
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out:
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return IRQ_HANDLED;
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}
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