serial: mvebu-uart: support extended port registers layout

Define the missing register offsets and bit fields for the extended
UART port. Add a second driver data structure filled with its port data,
selected with the right compatible (marvell,armada-3700-uart-ext).

Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/mvebu-uart.c

@@ -39,10 +39,13 @@
 
 /* Register Map */
 #define UART_STD_RBR		0x00
+#define UART_EXT_RBR		0x18
 
 #define UART_STD_TSH		0x04
+#define UART_EXT_TSH		0x1C
 
 #define UART_STD_CTRL1		0x08
+#define UART_EXT_CTRL1		0x04
 #define  CTRL_SOFT_RST		BIT(31)
 #define  CTRL_TXFIFO_RST	BIT(15)
 #define  CTRL_RXFIFO_RST	BIT(14)
@@ -55,15 +58,20 @@
 				CTRL_PAR_ERR_INT | CTRL_OVR_ERR_INT)
 
 #define UART_STD_CTRL2		UART_STD_CTRL1
+#define UART_EXT_CTRL2		0x20
 #define  CTRL_STD_TX_RDY_INT	BIT(5)
+#define  CTRL_EXT_TX_RDY_INT	BIT(6)
 #define  CTRL_STD_RX_RDY_INT	BIT(4)
+#define  CTRL_EXT_RX_RDY_INT	BIT(5)
 
 #define UART_STAT		0x0C
 #define  STAT_TX_FIFO_EMP	BIT(13)
 #define  STAT_TX_FIFO_FUL	BIT(11)
 #define  STAT_TX_EMP		BIT(6)
 #define  STAT_STD_TX_RDY	BIT(5)
+#define  STAT_EXT_TX_RDY	BIT(15)
 #define  STAT_STD_RX_RDY	BIT(4)
+#define  STAT_EXT_RX_RDY	BIT(14)
 #define  STAT_BRK_DET		BIT(3)
 #define  STAT_FRM_ERR		BIT(2)
 #define  STAT_PAR_ERR		BIT(1)
@@ -865,12 +873,28 @@ static struct mvebu_uart_driver_data uart_std_driver_data = {
 	.flags.stat_rx_rdy = STAT_STD_RX_RDY,
 };
 
+static struct mvebu_uart_driver_data uart_ext_driver_data = {
+	.is_ext = true,
+	.regs.rbr = UART_EXT_RBR,
+	.regs.tsh = UART_EXT_TSH,
+	.regs.ctrl = UART_EXT_CTRL1,
+	.regs.intr = UART_EXT_CTRL2,
+	.flags.ctrl_tx_rdy_int = CTRL_EXT_TX_RDY_INT,
+	.flags.ctrl_rx_rdy_int = CTRL_EXT_RX_RDY_INT,
+	.flags.stat_tx_rdy = STAT_EXT_TX_RDY,
+	.flags.stat_rx_rdy = STAT_EXT_RX_RDY,
+};
+
 /* Match table for of_platform binding */
 static const struct of_device_id mvebu_uart_of_match[] = {
 	{
 		.compatible = "marvell,armada-3700-uart",
 		.data = (void *)&uart_std_driver_data,
 	},
+	{
+		.compatible = "marvell,armada-3700-uart-ext",
+		.data = (void *)&uart_ext_driver_data,
+	},
 	{}
 };