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This patch was derived from the Vizzini driver and this patch:
https://www.spinics.net/lists/linux-serial/msg25999.html
Since all prior versions of MTCDT used the Vizzini driver,
the mapping of 5 bit serial to multidrop (9 bit serial) was
used.
The purpose of this patch is to reserve the Atmel 5 bit mode
for 9 bit usage on MTCDT MTAC-MFSER.
===========================================================================================
diff --git orig/drivers/tty/serial/atmel_serial.c new/drivers/tty/serial/atmel_serial.c
index 1297853..cd7987b 100644
--- orig/drivers/tty/serial/atmel_serial.c
+++ new/drivers/tty/serial/atmel_serial.c
@@ -2073,7 +2073,7 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned long flags;
- unsigned int old_mode, mode, imr, quot, baud, div, cd, fp = 0;
+ unsigned int old_mode, mode, mdrop, imr, quot, baud, div, cd, fp = 0;
/* save the current mode register */
mode = old_mode = atmel_uart_readl(port, ATMEL_US_MR);
@@ -2084,10 +2084,13 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+ mdrop = 0;
/* byte size */
switch (termios->c_cflag & CSIZE) {
case CS5:
- mode |= ATMEL_US_CHRL_5;
+ mode |= ATMEL_US_PAR_MULTI_DROP;
+ mdrop = ATMEL_US_SENDA;
+ printk(KERN_INFO "termios: Setting Atmel Multi-Drop serial");
break;
case CS6:
mode |= ATMEL_US_CHRL_6;
@@ -2246,7 +2249,8 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
atmel_uart_writel(port, ATMEL_US_BRGR, quot);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
- atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN);
+ atmel_uart_writel(port, ATMEL_US_CR,
+ mdrop | ATMEL_US_TXEN | ATMEL_US_RXEN);
atmel_port->tx_stopped = false;
/* restore interrupts */
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