[PATCH v7 2/3] serial: exar: split out the exar code from 8250_pci

[Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>]

Add the serial driver for the exar chips. And also register the
platform device for the exar gpio.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@xxxxxxxxxxxxxxx>
---

Hi Andy,
Headers, if arranged in alphabetical order, will give a build warning.
And thanks for revewing that v6. I think those were the worst patch I
have ever posted.

 drivers/tty/serial/8250/8250_exar.c | 515 ++++++++++++++++++++++++++++++++++++
 drivers/tty/serial/8250/Kconfig     |   5 +
 drivers/tty/serial/8250/Makefile    |   1 +
 3 files changed, 521 insertions(+)
 create mode 100644 drivers/tty/serial/8250/8250_exar.c

diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
new file mode 100644
index 0000000..abfd803
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -0,0 +1,515 @@
+/*
+ *  Probe module for 8250/16550-type Exar chips PCI serial ports.
+ *
+ *  Based on drivers/tty/serial/8250/8250_pci.c,
+ *
+ *  Copyright (C) 2017 Sudip Mukherjee, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+
+#undef DEBUG
+#include <asm/byteorder.h>
+#include <linux/pci.h>
+#include <linux/8250_pci.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/tty.h>
+
+#include "8250.h"
+
+#define PCI_DEVICE_ID_COMMTECH_4224PCIE	0x0020
+#define PCI_DEVICE_ID_COMMTECH_4228PCIE	0x0021
+#define PCI_DEVICE_ID_COMMTECH_4222PCIE	0x0022
+#define PCI_DEVICE_ID_EXAR_XR17V4358	0x4358
+#define PCI_DEVICE_ID_EXAR_XR17V8358	0x8358
+
+#define UART_EXAR_MPIOINT_7_0	0x8f	/* MPIOINT[7:0] */
+#define UART_EXAR_MPIOLVL_7_0	0x90	/* MPIOLVL[7:0] */
+#define UART_EXAR_MPIO3T_7_0	0x91	/* MPIO3T[7:0] */
+#define UART_EXAR_MPIOINV_7_0	0x92	/* MPIOINV[7:0] */
+#define UART_EXAR_MPIOSEL_7_0	0x93	/* MPIOSEL[7:0] */
+#define UART_EXAR_MPIOOD_7_0	0x94	/* MPIOOD[7:0] */
+#define UART_EXAR_MPIOINT_15_8	0x95	/* MPIOINT[15:8] */
+#define UART_EXAR_MPIOLVL_15_8	0x96	/* MPIOLVL[15:8] */
+#define UART_EXAR_MPIO3T_15_8	0x97	/* MPIO3T[15:8] */
+#define UART_EXAR_MPIOINV_15_8	0x98	/* MPIOINV[15:8] */
+#define UART_EXAR_MPIOSEL_15_8	0x99	/* MPIOSEL[15:8] */
+#define UART_EXAR_MPIOOD_15_8	0x9a	/* MPIOOD[15:8] */
+
+#define PCI_NUM_BAR_RESOURCES	6
+
+struct exar8250;
+
+struct exar8250_board {
+	unsigned int num_ports;
+	unsigned int base_baud;
+	unsigned int uart_offset; /* the space between channels */
+	/*
+	 * reg_shift:  describes how the UART registers are mapped
+	 * to PCI memory by the card.
+	 */
+	unsigned int reg_shift;
+	unsigned int first_offset;
+	int	(*setup)(struct exar8250 *,
+			 const struct exar8250_board *,
+			 struct uart_8250_port *, int);
+	void	(*exit)(struct pci_dev *dev);
+};
+
+struct exar8250 {
+	struct pci_dev		*dev;
+	unsigned int		nr;
+	struct exar8250_board	*board;
+	int			line[0];
+};
+
+static int default_setup(struct exar8250 *priv,
+			     const struct exar8250_board *board,
+			     struct uart_8250_port *port, int idx)
+{
+	unsigned int bar = 0, offset = board->first_offset, maxnr;
+	struct pci_dev *dev = priv->dev;
+
+	offset += idx * board->uart_offset;
+
+	maxnr = (pci_resource_len(dev, bar) - board->first_offset) >>
+		(board->reg_shift + 3);
+
+	if (idx >= maxnr)
+		return 1;
+
+	if (!pcim_iomap(dev, bar, 0) && !pcim_iomap_table(dev))
+		return -ENOMEM;
+
+	port->port.iotype = UPIO_MEM;
+	port->port.iobase = 0;
+	port->port.mapbase = pci_resource_start(dev, bar) + offset;
+	port->port.membase = pcim_iomap_table(dev)[bar] + offset;
+	port->port.regshift = board->reg_shift;
+
+	return 0;
+}
+
+static int
+pci_xr17c154_setup(struct exar8250 *priv,
+		   const struct exar8250_board *board,
+		  struct uart_8250_port *port, int idx)
+{
+	port->port.flags |= UPF_EXAR_EFR;
+	return default_setup(priv, board, port, idx);
+}
+
+static inline int
+xr17v35x_has_slave(struct exar8250 *priv)
+{
+	const int dev_id = priv->dev->device;
+
+	return ((dev_id == PCI_DEVICE_ID_EXAR_XR17V4358) ||
+		(dev_id == PCI_DEVICE_ID_EXAR_XR17V8358));
+}
+
+static int
+pci_xr17v35x_setup(struct exar8250 *priv,
+		   const struct exar8250_board *board,
+		  struct uart_8250_port *port, int idx)
+{
+	u8 __iomem *p;
+	int ret;
+
+	p = pci_ioremap_bar(priv->dev, 0);
+	if (!p)
+		return -ENOMEM;
+
+	port->port.flags |= UPF_EXAR_EFR;
+
+	/*
+	 * Setup the uart clock for the devices on expansion slot to
+	 * half the clock speed of the main chip (which is 125MHz)
+	 */
+	if (xr17v35x_has_slave(priv) && idx >= 8)
+		port->port.uartclk = (7812500 * 16 / 2);
+
+	/*
+	 * Setup Multipurpose Input/Output pins.
+	 */
+	if (idx == 0) {
+		writeb(0x00, p + UART_EXAR_MPIOINT_7_0);
+		writeb(0x00, p + UART_EXAR_MPIOLVL_7_0);
+		writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
+		writeb(0x00, p + UART_EXAR_MPIOINV_7_0);
+		writeb(0x00, p + UART_EXAR_MPIOSEL_7_0);
+		writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
+		writeb(0x00, p + UART_EXAR_MPIOINT_15_8);
+		writeb(0x00, p + UART_EXAR_MPIOLVL_15_8);
+		writeb(0x00, p + UART_EXAR_MPIO3T_15_8);
+		writeb(0x00, p + UART_EXAR_MPIOINV_15_8);
+		writeb(0x00, p + UART_EXAR_MPIOSEL_15_8);
+		writeb(0x00, p + UART_EXAR_MPIOOD_15_8);
+	}
+	writeb(0x00, p + UART_EXAR_8XMODE);
+	writeb(UART_FCTR_EXAR_TRGD, p + UART_EXAR_FCTR);
+	writeb(128, p + UART_EXAR_TXTRG);
+	writeb(128, p + UART_EXAR_RXTRG);
+	iounmap(p);
+
+	ret = default_setup(priv, board, port, idx);
+	if (ret)
+		return ret;
+
+	if (idx == 0) {
+		struct platform_device *device;
+
+		device = platform_device_alloc("gpio_exar",
+					       PLATFORM_DEVID_AUTO);
+		if (!device)
+			return -ENOMEM;
+
+		platform_set_drvdata(device, priv->dev);
+		if (platform_device_add(device) < 0) {
+			platform_device_put(device);
+			return -ENODEV;
+		}
+
+		port->port.private_data = device;
+	}
+
+	return 0;
+}
+
+static void pci_xr17v35x_exit(struct pci_dev *dev)
+{
+	struct exar8250 *priv = pci_get_drvdata(dev);
+	struct uart_8250_port *port = serial8250_get_port(priv->line[0]);
+	struct platform_device *pdev = port->port.private_data;
+
+	if (pdev) {
+		platform_device_unregister(pdev);
+		port->port.private_data = NULL;
+	}
+}
+
+static int
+exar_pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
+{
+	struct exar8250_board *board;
+	struct uart_8250_port uart;
+	struct exar8250 *priv;
+	int nr_ports, i;
+	int rc;
+
+	board = (struct exar8250_board *)ent->driver_data;
+
+	rc = pcim_enable_device(dev);
+	pci_save_state(dev);
+	if (rc)
+		return rc;
+
+	nr_ports = board->num_ports;
+
+	priv = kzalloc(sizeof(*priv) + sizeof(unsigned int) * nr_ports,
+		       GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	priv->board = board;
+
+	memset(&uart, 0, sizeof(uart));
+	uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
+	uart.port.uartclk = board->base_baud * 16;
+	uart.port.irq = dev->irq;
+	uart.port.dev = &dev->dev;
+
+	for (i = 0; i < nr_ports; i++) {
+		if (board->setup(priv, board, &uart, i))
+			break;
+
+		dev_dbg(&dev->dev, "Setup PCI port: port %lx, irq %d, type %d\n",
+			uart.port.iobase, uart.port.irq, uart.port.iotype);
+
+		priv->line[i] = serial8250_register_8250_port(&uart);
+		if (priv->line[i] < 0) {
+			dev_err(&dev->dev,
+				"Couldn't register serial port %lx, irq %d, type %d, error %d\n",
+				uart.port.iobase, uart.port.irq,
+				uart.port.iotype, priv->line[i]);
+			break;
+		}
+	}
+	priv->nr = i;
+	pci_set_drvdata(dev, priv);
+	return 0;
+}
+
+static void exar_pci_remove(struct pci_dev *dev)
+{
+	int i;
+	struct exar8250 *priv = pci_get_drvdata(dev);
+
+	for (i = 0; i < priv->nr; i++)
+		serial8250_unregister_port(priv->line[i]);
+
+	if (priv->board->exit)
+		priv->board->exit(priv->dev);
+
+	kfree(priv);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int exar_suspend(struct device *dev)
+{
+	int i;
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct exar8250 *priv = pci_get_drvdata(pdev);
+
+
+	for (i = 0; i < priv->nr; i++)
+		if (priv->line[i] >= 0)
+			serial8250_suspend_port(priv->line[i]);
+
+	/*
+	 * Ensure that every init quirk is properly torn down
+	 */
+	if (priv->board->exit)
+		priv->board->exit(priv->dev);
+
+	return 0;
+}
+
+static int exar_resume(struct device *dev)
+{
+	int i;
+	int err;
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct exar8250 *priv = pci_get_drvdata(pdev);
+
+	if (priv) {
+		/*
+		 * The device may have been disabled.  Re-enable it.
+		 */
+		err = pci_enable_device(pdev);
+		/* FIXME: We cannot simply error out here */
+		if (err)
+			dev_err(dev, "Unable to re-enable ports, trying to continue.\n");
+
+		for (i = 0; i < priv->nr; i++)
+			if (priv->line[i] >= 0)
+				serial8250_resume_port(priv->line[i]);
+	}
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(exar_pci_pm, exar_suspend, exar_resume);
+
+static const struct exar8250_board pbn_b0_2_1843200_200 = {
+	.num_ports	= 2,
+	.base_baud	= 1843200,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup
+};
+
+static const struct exar8250_board pbn_b0_4_1843200_200 = {
+	.num_ports	= 4,
+	.base_baud	= 1843200,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup
+};
+
+static const struct exar8250_board pbn_b0_8_1843200_200 = {
+	.num_ports	= 8,
+	.base_baud	= 1843200,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_ibm_saturn = {
+	.num_ports	= 1,
+	.base_baud	= 921600,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_XR17C152 = {
+	.num_ports	= 2,
+	.base_baud	= 921600,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_XR17C154 = {
+	.num_ports	= 4,
+	.base_baud	= 921600,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_XR17C158 = {
+	.num_ports	= 8,
+	.base_baud	= 921600,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_XR17V352 = {
+	.num_ports	= 2,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_exar_XR17V354 = {
+	.num_ports	= 4,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_exar_XR17V358 = {
+	.num_ports	= 8,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_exar_XR17V4358 = {
+	.num_ports	= 12,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_exar_XR17V8358 = {
+	.num_ports	= 16,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static struct pci_device_id exar_pci_tbl[] = {
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C152,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_232), 0, 0,
+		(kernel_ulong_t)&pbn_b0_2_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C154,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_232), 0, 0,
+		(kernel_ulong_t)&pbn_b0_4_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C158,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_232), 0, 0,
+		(kernel_ulong_t)&pbn_b0_8_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C152,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_1_1), 0, 0,
+		(kernel_ulong_t)&pbn_b0_2_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C154,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_2), 0, 0,
+		(kernel_ulong_t)&pbn_b0_4_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C158,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4), 0, 0,
+		(kernel_ulong_t)&pbn_b0_8_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C152,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2), 0, 0,
+		(kernel_ulong_t)&pbn_b0_2_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C154,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4), 0, 0,
+		(kernel_ulong_t)&pbn_b0_4_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C158,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8), 0, 0,
+		(kernel_ulong_t)&pbn_b0_8_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C152,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_485), 0, 0,
+		(kernel_ulong_t)&pbn_b0_2_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C154,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_485), 0, 0,
+		(kernel_ulong_t)&pbn_b0_4_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C158,
+		PCI_SUBVENDOR_ID_CONNECT_TECH,
+		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_485), 0, 0,
+		(kernel_ulong_t)&pbn_b0_8_1843200_200 },
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C152,
+		PCI_VENDOR_ID_IBM,
+		PCI_SUBDEVICE_ID_IBM_SATURN_SERIAL_ONE_PORT), 0, 0,
+		(kernel_ulong_t)&pbn_exar_ibm_saturn },
+	/*
+	 * Exar Corp. XR17C15[248] Dual/Quad/Octal UART
+	 */
+	{	PCI_VDEVICE(EXAR, PCI_DEVICE_ID_EXAR_XR17C152),
+		(kernel_ulong_t)&pbn_exar_XR17C152 },
+	{	PCI_VDEVICE(EXAR, PCI_DEVICE_ID_EXAR_XR17C154),
+		(kernel_ulong_t)&pbn_exar_XR17C154 },
+	{	PCI_VDEVICE(EXAR, PCI_DEVICE_ID_EXAR_XR17C158),
+		(kernel_ulong_t)&pbn_exar_XR17C158 },
+	/*
+	 * Exar Corp. XR17V[48]35[248] Dual/Quad/Octal/Hexa PCIe UARTs
+	 */
+	{	PCI_VDEVICE(EXAR, PCI_DEVICE_ID_EXAR_XR17V352),
+		(kernel_ulong_t)&pbn_exar_XR17V352 },
+	{	PCI_VDEVICE(EXAR, PCI_DEVICE_ID_EXAR_XR17V354),
+		(kernel_ulong_t)&pbn_exar_XR17V354 },
+	{	PCI_VDEVICE(EXAR, PCI_DEVICE_ID_EXAR_XR17V358),
+		(kernel_ulong_t)&pbn_exar_XR17V358 },
+	{	PCI_VDEVICE(EXAR, PCI_DEVICE_ID_EXAR_XR17V4358),
+		(kernel_ulong_t)&pbn_exar_XR17V4358 },
+	{	PCI_VDEVICE(EXAR, PCI_DEVICE_ID_EXAR_XR17V8358),
+		(kernel_ulong_t)&pbn_exar_XR17V8358 },
+	{	PCI_VDEVICE(COMMTECH, PCI_DEVICE_ID_COMMTECH_4222PCIE),
+		(kernel_ulong_t)&pbn_exar_XR17V352 },
+	{	PCI_VDEVICE(COMMTECH, PCI_DEVICE_ID_COMMTECH_4224PCIE),
+		(kernel_ulong_t)&pbn_exar_XR17V354 },
+	{	PCI_VDEVICE(COMMTECH, PCI_DEVICE_ID_COMMTECH_4228PCIE),
+		(kernel_ulong_t)&pbn_exar_XR17V358 },
+	{ 0, }
+};
+
+static struct pci_driver exar_pci_driver = {
+	.name		= "exar_serial",
+	.probe		= exar_pci_probe,
+	.remove		= exar_pci_remove,
+	.driver         = {
+		.pm     = &exar_pci_pm,
+	},
+	.id_table	= exar_pci_tbl,
+};
+
+module_pci_driver(exar_pci_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Exar Serial Dricer");
+MODULE_DEVICE_TABLE(pci, exar_pci_tbl);
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 8998347..9f8bd0a 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -127,6 +127,11 @@ config SERIAL_8250_PCI
 	  Note that serial ports on NetMos 9835 Multi-I/O cards are handled
 	  by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
 
+config SERIAL_8250_EXAR
+        tristate "8250/16550 PCI device support"
+        depends on SERIAL_8250_PCI
+	default SERIAL_8250
+
 config SERIAL_8250_HP300
 	tristate
 	depends on SERIAL_8250 && HP300
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 276c6fb..b771d37 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_SERIAL_8250)		+= 8250.o 8250_base.o
 8250_base-$(CONFIG_SERIAL_8250_FINTEK)	+= 8250_fintek.o
 obj-$(CONFIG_SERIAL_8250_GSC)		+= 8250_gsc.o
 obj-$(CONFIG_SERIAL_8250_PCI)		+= 8250_pci.o
+obj-$(CONFIG_SERIAL_8250_EXAR)		+= 8250_exar.o
 obj-$(CONFIG_SERIAL_8250_HP300)		+= 8250_hp300.o
 obj-$(CONFIG_SERIAL_8250_CS)		+= serial_cs.o
 obj-$(CONFIG_SERIAL_8250_ACORN)		+= 8250_acorn.o
-- 
1.9.1

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