[SERIAL] OMAP1510 serial fix for 115200 baud

The patch below is necessary for 115200 baud on an OMAP1510 internal UART.
It's been in the linux-omap tree for some time and with it applied to a
vanilla Linus git tree the serial console on the Amstrad Delta (which is
OMAP1510 based and whose initial bootloader runs at 115200) works fine (it
doesn't without it).
Signed-off-by: NJonathan McDowell <noodles@earth.li>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

drivers/serial/8250.c

@@ -1896,6 +1896,17 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
 		serial_outp(up, UART_EFR, efr);
 	}
 
+#ifdef CONFIG_ARCH_OMAP15XX
+	/* Workaround to enable 115200 baud on OMAP1510 internal ports */
+	if (cpu_is_omap1510() && is_omap_port((unsigned int)up->port.membase)) {
+		if (baud == 115200) {
+			quot = 1;
+			serial_out(up, UART_OMAP_OSC_12M_SEL, 1);
+		} else
+			serial_out(up, UART_OMAP_OSC_12M_SEL, 0);
+	}
+#endif
+
 	if (up->capabilities & UART_NATSEMI) {
 		/* Switch to bank 2 not bank 1, to avoid resetting EXCR2 */
 		serial_outp(up, UART_LCR, 0xe0);