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Subject[PATCH 31/32] Blackfin serial driver: implement support for ignoring parity/break errors
Date
From: Mike Frysinger <michael.frysinger@analog.com>

properly setting up and respecting the read_status_mask / ignore_status_mask fields of the serial core

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
drivers/serial/bfin_5xx.c | 97 ++++++++++++++++++++++++++++-----------------
1 files changed, 61 insertions(+), 36 deletions(-)

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index a8271d9..787dc71 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -6,8 +6,6 @@
* Created:
* Description: Driver for blackfin 5xx serial ports
*
- * Rev: $Id: bfin_5xx.c,v 1.19 2006/09/24 02:33:53 aubrey Exp $
- *
* Modified:
* Copyright 2006 Analog Devices Inc.
*
@@ -152,7 +150,7 @@ static void local_put_char(struct bfin_serial_port *uart, char ch)

static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
{
- struct tty_struct *tty = uart->port.info?uart->port.info->tty:0;
+ struct tty_struct *tty = uart->port.info->tty;
unsigned int status, ch, flg;
#ifdef BF533_FAMILY
static int in_break = 0;
@@ -173,8 +171,10 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
if (ch != 0) {
in_break = 0;
ch = UART_GET_CHAR(uart);
- }
- return;
+ if (bfin_revid() < 5)
+ return;
+ } else
+ return;
}
#endif

@@ -185,27 +185,32 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
uart->port.icount.brk++;
if (uart_handle_break(&uart->port))
goto ignore_char;
- flg = TTY_BREAK;
- } else if (status & PE) {
- flg = TTY_PARITY;
+ }
+ if (status & PE)
uart->port.icount.parity++;
- } else if (status & OE) {
- flg = TTY_OVERRUN;
+ if (status & OE)
uart->port.icount.overrun++;
- } else if (status & FE) {
- flg = TTY_FRAME;
+ if (status & FE)
uart->port.icount.frame++;
- } else
+
+ status &= uart->port.read_status_mask;
+
+ if (status & BI)
+ flg = TTY_BREAK;
+ else if (status & PE)
+ flg = TTY_PARITY;
+ else if (status & FE)
+ flg = TTY_FRAME;
+ else
flg = TTY_NORMAL;

if (uart_handle_sysrq_char(&uart->port, ch))
goto ignore_char;
- if (tty)
- uart_insert_char(&uart->port, status, 2, ch, flg);

-ignore_char:
- if (tty)
- tty_flip_buffer_push(tty);
+ uart_insert_char(&uart->port, status, OE, ch, flg);
+
+ ignore_char:
+ tty_flip_buffer_push(tty);
}

static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
@@ -254,7 +259,6 @@ static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
{
struct bfin_serial_port *uart = dev_id;
- unsigned short status;

spin_lock(&uart->port.lock);
while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY)
@@ -325,7 +329,7 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
spin_unlock_irqrestore(&uart->port.lock, flags);
}

-static void bfin_serial_dma_rx_chars(struct bfin_serial_port * uart)
+static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
{
struct tty_struct *tty = uart->port.info->tty;
int i, flg, status;
@@ -337,25 +341,32 @@ static void bfin_serial_dma_rx_chars(struct bfin_serial_port * uart)
uart->port.icount.brk++;
if (uart_handle_break(&uart->port))
goto dma_ignore_char;
- flg = TTY_BREAK;
- } else if (status & PE) {
- flg = TTY_PARITY;
+ }
+ if (status & PE)
uart->port.icount.parity++;
- } else if (status & OE) {
- flg = TTY_OVERRUN;
+ if (status & OE)
uart->port.icount.overrun++;
- } else if (status & FE) {
- flg = TTY_FRAME;
+ if (status & FE)
uart->port.icount.frame++;
- } else
+
+ status &= uart->port.read_status_mask;
+
+ if (status & BI)
+ flg = TTY_BREAK;
+ else if (status & PE)
+ flg = TTY_PARITY;
+ else if (status & FE)
+ flg = TTY_FRAME;
+ else
flg = TTY_NORMAL;

for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
goto dma_ignore_char;
- uart_insert_char(&uart->port, status, 2, uart->rx_dma_buf.buf[i], flg);
+ uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
}
-dma_ignore_char:
+
+ dma_ignore_char:
tty_flip_buffer_push(tty);
}

@@ -620,13 +631,27 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
lcr |= EPS;
}

- /* These controls are not implemented for this port */
- termios->c_iflag |= INPCK | BRKINT | PARMRK;
- termios->c_iflag &= ~(IGNPAR | IGNBRK);
+ port->read_status_mask = OE;
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= (FE | PE);
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ port->read_status_mask |= BI;

- /* These controls are not implemented for this port */
- termios->c_iflag |= INPCK | BRKINT | PARMRK;
- termios->c_iflag &= ~(IGNPAR | IGNBRK);
+ /*
+ * Characters to ignore
+ */
+ port->ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |= FE | PE;
+ if (termios->c_iflag & IGNBRK) {
+ port->ignore_status_mask |= BI;
+ /*
+ * If we're ignoring parity and break indicators,
+ * ignore overruns too (for real raw support).
+ */
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |= OE;
+ }

baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
quot = uart_get_divisor(port, baud);
--
1.5.1.2
-
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