openwrtv4/target/linux/at91-2.6/patches/008-fdl-serial.patch

--- linux-2.6.19.2.old/drivers/serial/atmel_serial.c	2007-05-01 13:08:03.000000000 +0200
+++ linux-2.6.19.2/drivers/serial/atmel_serial.c	2007-05-09 10:21:45.000000000 +0200
@@ -173,6 +173,34 @@
 				at91_set_gpio_value(AT91_PIN_PA21, 0);
 			else
 				at91_set_gpio_value(AT91_PIN_PA21, 1);
+
+			/* 
+			 * FDL VersaLink adds GPIOS to provide full modem control on
+			 * USART 0 - Drive DTR and RI pins manually
+			 */
+			if (mctrl & TIOCM_DTR)
+				at91_set_gpio_value(AT91_PIN_PB6, 0);
+			else
+				at91_set_gpio_value(AT91_PIN_PB6, 1);
+			if (mctrl & TIOCM_RI)
+				at91_set_gpio_value(AT91_PIN_PB7, 0);
+			else
+				at91_set_gpio_value(AT91_PIN_PB7, 1);
+		}
+
+		/* 
+		 * FDL VersaLink adds GPIOS to provide full modem control on
+		 * USART 3 - Drive DTR and RI pins manually
+		 */
+		if (port->mapbase == AT91RM9200_BASE_US3) {
+			if (mctrl & TIOCM_DTR)
+				at91_set_gpio_value(AT91_PIN_PB29, 0);
+			else
+				at91_set_gpio_value(AT91_PIN_PB29, 1);
+			if (mctrl & TIOCM_RI)
+				at91_set_gpio_value(AT91_PIN_PB2, 0);
+			else
+				at91_set_gpio_value(AT91_PIN_PB2, 1);
 		}
 	}
 #endif
@@ -210,8 +238,14 @@
 	/*
 	 * The control signals are active low.
 	 */
-	if (!(status & ATMEL_US_DCD))
-		ret |= TIOCM_CD;
+
+	/* 
+	 * Ignore DCD reister for USARTS 0 and 3 as FDL Versalink uses
+	 * GPIO's for these signals
+	 */
+	if (!(port->mapbase == AT91RM9200_BASE_US0 || port->mapbase == AT91RM9200_BASE_US3))
+		if (!(status & ATMEL_US_DCD))
+			ret |= TIOCM_CD;
 	if (!(status & ATMEL_US_CTS))
 		ret |= TIOCM_CTS;
 	if (!(status & ATMEL_US_DSR))
@@ -219,6 +253,16 @@
 	if (!(status & ATMEL_US_RI))
 		ret |= TIOCM_RI;
 
+	/*
+	 * Read the GPIO's for the FDL VersaLink special case
+	 */
+	if (port->mapbase == AT91RM9200_BASE_US0)
+		if (!(at91_get_gpio_value(AT91_PIN_PA19)))
+			ret |= TIOCM_CD;
+	if (port->mapbase == AT91RM9200_BASE_US3)
+		if (!(at91_get_gpio_value(AT91_PIN_PA24)))
+			ret |= TIOCM_CD;
+
 	return ret;
 }