[ARM] S3C: Update number of serial ports

Update the serial driver to handle the 4 ports of the
S3C2443 and S364XX series.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

drivers/serial/Kconfig

@@ -455,6 +455,16 @@ config SERIAL_SAMSUNG
 	  provide all of these ports, depending on how the serial port
 	  pins are configured.
 
+config SERIAL_SAMSUNG_UARTS
+	int
+	depends on SERIAL_SAMSUNG
+	default 2 if ARCH_S3C2400
+	default 4 if ARCH_S3C64XX || CPU_S3C2443
+	default 3
+	help
+	  Select the number of available UART ports for the Samsung S3C
+	  serial driver
+
 config SERIAL_SAMSUNG_DEBUG
 	bool "Samsung SoC serial debug"
 	depends on SERIAL_SAMSUNG && DEBUG_LL

drivers/serial/samsung.c

@@ -59,14 +59,6 @@
 #define S3C24XX_SERIAL_MAJOR	204
 #define S3C24XX_SERIAL_MINOR	64
 
-/* we can support 3 uarts, but not always use them */
-
-#if defined(CONFIG_CPU_S3C2400) || defined(CONFIG_CPU_S3C24A0)
-#define NR_PORTS (2)
-#else
-#define NR_PORTS (3)
-#endif
-
 /* macros to change one thing to another */
 
 #define tx_enabled(port) ((port)->unused[0])
@@ -839,7 +831,7 @@ static struct uart_driver s3c24xx_uart_drv = {
 	.minor		= S3C24XX_SERIAL_MINOR,
 };
 
-static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
+static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
 	[0] = {
 		.port = {
 			.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
@@ -864,7 +856,7 @@ static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
 			.line		= 1,
 		}
 	},
-#if NR_PORTS > 2
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 2
 
 	[2] = {
 		.port = {
@@ -877,6 +869,20 @@ static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
 			.flags		= UPF_BOOT_AUTOCONF,
 			.line		= 2,
 		}
+	},
+#endif
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
+	[3] = {
+		.port = {
+			.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock),
+			.iotype		= UPIO_MEM,
+			.irq		= IRQ_S3CUART_RX3,
+			.uartclk	= 0,
+			.fifosize	= 16,
+			.ops		= &s3c24xx_serial_ops,
+			.flags		= UPF_BOOT_AUTOCONF,
+			.line		= 3,
+		}
 	}
 #endif
 };
@@ -1324,7 +1330,7 @@ static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info)
 
 	platdev_ptr = s3c24xx_uart_devs;
 
-	for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) {
+	for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++, ptr++, platdev_ptr++) {
 		s3c24xx_serial_init_port(ptr, info, *platdev_ptr);
 	}
 
@@ -1345,7 +1351,7 @@ s3c24xx_serial_console_setup(struct console *co, char *options)
 
 	/* is this a valid port */
 
-	if (co->index == -1 || co->index >= NR_PORTS)
+	if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
 		co->index = 0;
 
 	port = &s3c24xx_serial_ports[co->index].port;