Merge bk://bk.arm.linux.org.uk/linux-2.6-serial

into home.osdl.org:/home/torvalds/v2.5/linux

MAINTAINERS

@@ -114,8 +114,8 @@ W:	http://sourceforge.net/projects/gkernel/
 S:	Maintained
 
 8250/16?50 (AND CLONE UARTS) SERIAL DRIVER
-P:	Theodore Ts'o
-M:	tytso@mit.edu
+P:	Russell King
+M:	rmk+serial@arm.linux.org.uk
 L:	linux-serial@vger.kernel.org
 W:	http://serial.sourceforge.net
 S:	Maintained

drivers/serial/8250.c

@@ -469,8 +469,14 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 	 */
 	serial_outp(up, UART_LCR, UART_LCR_DLAB);
 	if (serial_in(up, UART_EFR) == 0) {
+		serial_outp(up, UART_EFR, 0xA8);
+		if (serial_in(up, UART_EFR) != 0) {
 			DEBUG_AUTOCONF("EFRv1 ");
 			up->port.type = PORT_16650;
+		} else {
+			DEBUG_AUTOCONF("Motorola 8xxx DUART ");
+		}
+		serial_outp(up, UART_EFR, 0);
 		return;
 	}
 
@@ -490,7 +496,9 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 	 * Attempt to switch to bank 2, read the value of the LOOP bit
 	 * from EXCR1. Switch back to bank 0, change it in MCR. Then
 	 * switch back to bank 2, read it from EXCR1 again and check
-	 * it's changed. If so, set baud_base in EXCR2 to 921600.
+	 * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2
+	 * On PowerPC we don't want to change baud_base, as we have
+	 * a number of different divisors.  -- Tom Rini
 	 */
 	serial_outp(up, UART_LCR, 0);
 	status1 = serial_in(up, UART_MCR);
@@ -506,12 +514,14 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 		serial_outp(up, UART_MCR, status1);
 
 		if ((status2 ^ status1) & UART_MCR_LOOP) {
+#ifndef CONFIG_PPC
 			serial_outp(up, UART_LCR, 0xE0);
 			status1 = serial_in(up, 0x04); /* EXCR1 */
 			status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
 			status1 |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
 			serial_outp(up, 0x04, status1);
 			serial_outp(up, UART_LCR, 0);
+#endif
 
 			up->port.type = PORT_NS16550A;
 			up->port.uartclk = 921600*16;