Hardware flowcontrol on XR17D154

["Søren holm" <sgh@sgh.dk>]

[-- Attachment #1: Type: text/plain, Size: 258 bytes --]

Hi

I have hacked hardware flowcontrol into 8250.c for the XR17D154. I have 
attached the patch. The fix just uses another address for the EFR-register.

I would like to have some adwise as to how to do this the right way. 

Thanks.
-- 
Søren Holm

[-- Attachment #2: xr17d154_hwflow.patch --]
[-- Type: text/x-patch, Size: 1245 bytes --]

diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index b3b881b..ba28eb8 100644
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -301,7 +301,7 @@ static const struct serial8250_config uart_config[] = {
 		.fifo_size	= 64,
 		.tx_loadsz	= 64,
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
-		.flags		= UART_CAP_FIFO | UART_CAP_AFE,
+		.flags		= UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR,
 	},
 };
 
@@ -2420,7 +2420,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 			efr |= UART_EFR_CTS;
 
 		serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
-		serial_outp(up, UART_EFR, efr);
+		serial_outp(up, UART_EFR2, efr);
 	}
 
 #ifdef CONFIG_ARCH_OMAP
diff --git a/include/linux/serial_reg.h b/include/linux/serial_reg.h
index 3ecb71a..56b2569 100644
--- a/include/linux/serial_reg.h
+++ b/include/linux/serial_reg.h
@@ -150,6 +150,7 @@
  * LCR=0xBF (or DLAB=1 for 16C660)
  */
 #define UART_EFR	2	/* I/O: Extended Features Register */
+#define UART_EFR2	9	/* I/O: Extended Features Register for Exari XR17D154 */
 #define UART_EFR_CTS		0x80 /* CTS flow control */
 #define UART_EFR_RTS		0x40 /* RTS flow control */
 #define UART_EFR_SCD		0x20 /* Special character detect */