Blackfin serial driver: implement support for ignoring parity/break errors

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 61 insertions, 36 deletions

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index a8271d9c620..787dc7168f3 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);