Revert "tty: serial: Add UART driver for Cortina-Access platform"

This reverts commit b61c8bf4694b5115766849378dcb8787ff54e65e.  It never
made it to a public mailing list and still needs some work based on the
review comments.  So revert it for now.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/CAMuHMdXA9-ajoAza2JAW5879ECieMm1dbBbKHgJhDa7=3kWu3w@mail.gmail.com
Cc: Jason Li <jason.li@cortina-access.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 0 insertions, 818 deletions

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2fa39cd78c56..24282ad99d85 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1561,25 +1561,6 @@ config SERIAL_LITEUART_CONSOLE
 	  and warnings and which allows logins in single user mode).
 	  Otherwise, say 'N'.
 
-config SERIAL_CORTINA_ACCESS
-	tristate "Cortina-Access serial port support"
-	select SERIAL_CORE
-	help
-	  This driver is for Cortina-Access SoC's UART. If you have a machine
-	  based on the Cortina-Access SoC and wish to use the serial port,
-	  say 'Y' here. Otherwise, say 'N'.
-
-config SERIAL_CORTINA_ACCESS_CONSOLE
-	bool "Console on Cortina-ACCESS serial port"
-	depends on SERIAL_CORTINA_ACCESS=y
-	select SERIAL_CORE_CONSOLE
-	select SERIAL_EARLYCON
-	help
-	  Say 'Y' here if you wish to use Cortina-Access UART as the system
-	  console. (the system console is the device which receives all kernel
-	  messages and warnings and which allows logins in single user mode)
-	  /dev/ttyS* is default device node.
-
 endmenu
 
 config SERIAL_MCTRL_GPIO
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index f3f531a48854..7da0856cd198 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -87,7 +87,6 @@ obj-$(CONFIG_SERIAL_RDA)	+= rda-uart.o
 obj-$(CONFIG_SERIAL_MILBEAUT_USIO) += milbeaut_usio.o
 obj-$(CONFIG_SERIAL_SIFIVE)	+= sifive.o
 obj-$(CONFIG_SERIAL_LITEUART) += liteuart.o
-obj-$(CONFIG_SERIAL_CORTINA_ACCESS)	+= serial_cortina-access.o
 
 # GPIOLIB helpers for modem control lines
 obj-$(CONFIG_SERIAL_MCTRL_GPIO)	+= serial_mctrl_gpio.o
diff --git a/drivers/tty/serial/serial_cortina-access.c b/drivers/tty/serial/serial_cortina-access.c
deleted file mode 100644
index b4b9362bb4e6..000000000000
--- a/drivers/tty/serial/serial_cortina-access.c
+++ /dev/null
@@ -1,798 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  UART driver for Cortina-Access Soc platform
- *  Copyright (C) 2021 Cortina-Access Inc.
- */
-#include <linux/module.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial.h>
-#include <linux/sysrq.h>
-#include <linux/console.h>
-#include <linux/serial_core.h>
-#include <linux/delay.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-
-/***************************************
- *	UART Related registers
- ****************************************/
-/* register definitions */
-#define	CFG			0x00
-#define	FC			0x04
-#define	RX_SAMPLE		0x08
-#define	RT_TUNE			0x0C
-#define	TX_DAT			0x10
-#define	RX_DAT			0x14
-#define	INFO			0x18
-#define	IE			0x1C
-#define	INT			0x24
-#define	STATUS			0x2C
-
-/* CFG */
-#define	CFG_STOP_2BIT		BIT(2)
-#define	CFG_PARITY_EVEN	BIT(3)
-#define	CFG_PARITY_EN		BIT(4)
-#define	CFG_TX_EN		BIT(5)
-#define	CFG_RX_EN		BIT(6)
-#define	CFG_UART_EN		BIT(7)
-#define	CFG_BAUD_SART_SHIFT	8
-
-/* INFO */
-#define	INFO_TX_EMPTY		BIT(3)
-#define	INFO_TX_FULL		BIT(2)
-#define	INFO_RX_EMPTY		BIT(1)
-#define	INFO_RX_FULL		BIT(0)
-
-/* Interrupt */
-#define	RX_BREAK		BIT(7)
-#define	RX_FIFO_NONEMPTYE	BIT(6)
-#define	TX_FIFO_EMPTYE		BIT(5)
-#define	RX_FIFO_UNDERRUNE	BIT(4)
-#define	RX_FIFO_OVERRUNE	BIT(3)
-#define	RX_PARITY_ERRE		BIT(2)
-#define	RX_STOP_ERRE		BIT(1)
-#define	TX_FIFO_OVERRUNE	BIT(0)
-
-#define TX_TIMEOUT		5000
-#define UART_NR 4
-#define CA_UART_NAME_LEN	32
-struct cortina_uart_port {
-	struct uart_port uart;
-	char name[CA_UART_NAME_LEN];
-	char has_bi;
-	unsigned int may_wakeup;
-};
-
-static struct cortina_uart_port *cortina_uart_ports;
-
-static irqreturn_t cortina_uart_interrupt(int irq, void *dev_id);
-
-/* Return uart_port pointer base on index */
-struct cortina_uart_port *cortina_uart_get_port(unsigned int index)
-{
-	struct cortina_uart_port *pca_port = cortina_uart_ports;
-
-	if (index >= UART_NR) {
-		/* return 1st element if invalid index */
-		index = 0;
-	}
-
-	pca_port += index;
-
-	return pca_port;
-}
-
-/* uart_ops functions */
-static unsigned int cortina_uart_tx_empty(struct uart_port *port)
-{
-	/* Return 0 on FIXO condition, TIOCSER_TEMT otherwise */
-	return (readl(port->membase + INFO) & INFO_TX_EMPTY) ? TIOCSER_TEMT : 0;
-}
-
-static void cortina_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-/*
- * Even if we do not support configuring the modem control lines, this
- * function must be proided to the serial core.
- * port->ops->set_mctrl() be called in uart_configure_port()
- */
-}
-
-static unsigned int cortina_uart_get_mctrl(struct uart_port *port)
-{
-	/* Unimplemented signals asserted, per Documentation/serial/driver */
-	return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
-}
-
-static void cortina_uart_stop_tx(struct uart_port *port)
-{
-	/* Turn off Tx interrupts. The port lock is held at this point */
-	unsigned int reg_v;
-
-	reg_v = readl(port->membase + IE);
-	writel(reg_v & ~TX_FIFO_EMPTYE, port->membase + IE);
-}
-
-static inline void cortina_transmit_buffer(struct uart_port *port)
-{
-	struct circ_buf *xmit = &port->state->xmit;
-
-	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
-		cortina_uart_stop_tx(port);
-		return;
-	}
-
-	do {
-		/* send xmit->buf[xmit->tail] out the port here */
-		writel(xmit->buf[xmit->tail], port->membase + TX_DAT);
-		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-		port->icount.tx++;
-		if ((readl(port->membase + INFO) & INFO_TX_FULL))
-			break;
-	} while (!uart_circ_empty(xmit));
-
-	if (uart_circ_empty(xmit))
-		cortina_uart_stop_tx(port);
-}
-
-static void cortina_uart_start_tx(struct uart_port *port)
-{
-	/* Turn on Tx interrupts. The port lock is held at this point */
-	unsigned int reg_v;
-
-	reg_v = readl(port->membase + IE);
-	writel((reg_v | TX_FIFO_EMPTYE), port->membase + IE);
-
-	reg_v = readl(port->membase + CFG);
-	writel(reg_v | CFG_TX_EN, port->membase + CFG);
-
-	if (readl(port->membase + INFO) & INFO_TX_EMPTY)
-		cortina_transmit_buffer(port);
-}
-
-static void cortina_uart_stop_rx(struct uart_port *port)
-{
-	/* Turn off Rx interrupts. The port lock is held at this point */
-	unsigned int reg_v;
-
-	reg_v = readl(port->membase + IE);
-	writel(reg_v & ~RX_FIFO_NONEMPTYE, port->membase + IE);
-}
-
-static void cortina_uart_enable_ms(struct uart_port *port)
-{
-	/* Nope, you really can't hope to attach a modem to this */
-}
-
-static int cortina_uart_startup(struct uart_port *port)
-{
-	unsigned int reg_v;
-	int retval;
-	unsigned long flags;
-
-	/* Disable interrupt */
-	writel(0, port->membase + IE);
-
-	retval =
-	    request_irq(port->irq, cortina_uart_interrupt, 0, "cortina_uart",
-			port);
-	if (retval)
-		return retval;
-
-	spin_lock_irqsave(&port->lock, flags);
-
-	reg_v = readl(port->membase + CFG);
-	reg_v |= (CFG_UART_EN | CFG_TX_EN | CFG_RX_EN | 0x3 /* 8-bits data */);
-	writel(reg_v, port->membase + CFG);
-	reg_v = readl(port->membase + IE);
-	writel(reg_v | RX_FIFO_NONEMPTYE | TX_FIFO_EMPTYE, port->membase + IE);
-
-	spin_unlock_irqrestore(&port->lock, flags);
-	return 0;
-}
-
-static void cortina_uart_shutdown(struct uart_port *port)
-{
-	cortina_uart_stop_tx(port);
-	cortina_uart_stop_rx(port);
-	free_irq(port->irq, port);
-}
-
-static void cortina_uart_set_termios(struct uart_port *port,
-				     struct ktermios *termios,
-				     struct ktermios *old)
-{
-	unsigned long flags;
-	int baud;
-	unsigned int reg_v, sample_freq = 0;
-
-	baud = uart_get_baud_rate(port, termios, old, 0, 230400);
-	reg_v = readl(port->membase + CFG);
-	/* mask off the baud settings */
-	reg_v &= 0xff;
-	reg_v |= (port->uartclk / baud) << CFG_BAUD_SART_SHIFT;
-
-	/* Sampling rate should be half of baud count */
-	sample_freq = (reg_v >> CFG_BAUD_SART_SHIFT) / 2;
-
-	/* See include/uapi/asm-generic/termbits.h for CSIZE definition */
-	/* mask off the data width */
-	reg_v &= 0xfffffffc;
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		reg_v |= 0x0;
-		break;
-	case CS6:
-		reg_v |= 0x1;
-		break;
-	case CS7:
-		reg_v |= 0x2;
-		break;
-	case CS8:
-	default:
-		reg_v |= 0x3;
-		break;
-	}
-
-	/* mask off Stop bits */
-	reg_v &= ~(CFG_STOP_2BIT);
-	if (termios->c_cflag & CSTOPB)
-		reg_v |= CFG_STOP_2BIT;
-
-	/* Parity */
-	reg_v &= ~(CFG_PARITY_EN);
-	reg_v |= CFG_PARITY_EVEN;
-	if (termios->c_cflag & PARENB) {
-		reg_v |= CFG_PARITY_EN;
-		if (termios->c_cflag & PARODD)
-			reg_v &= ~(CFG_PARITY_EVEN);
-	}
-
-	spin_lock_irqsave(&port->lock, flags);
-	writel(reg_v, port->membase + CFG);
-	writel(sample_freq, port->membase + RX_SAMPLE);
-	spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static const char *cortina_uart_type(struct uart_port *port)
-{
-	return container_of(port, struct cortina_uart_port, uart)->name;
-}
-
-static void cortina_uart_config_port(struct uart_port *port, int flags)
-{
-	/*
-	 * Driver core for serial ports forces a non-zero value for port type.
-	 * Write an arbitrary value here to accommodate the serial core driver,
-	 * as ID part of UAPI is redundant.
-	 */
-	port->type = 1;
-}
-
-static int cortina_uart_verify_port(struct uart_port *port,
-				    struct serial_struct *ser)
-{
-	if (ser->type != PORT_UNKNOWN && ser->type != 1)
-		return -EINVAL;
-	return 0;
-}
-
-static void cortina_access_power(struct uart_port *port, unsigned int state,
-		      unsigned int oldstate)
-{
-	unsigned int reg_v;
-
-	/* Read Config register */
-	reg_v = readl(port->membase + CFG);
-	switch (state) {
-	case UART_PM_STATE_ON:
-		reg_v |= CFG_UART_EN;
-		break;
-	case UART_PM_STATE_OFF:
-		reg_v &= ~CFG_UART_EN;
-		break;
-	default:
-		pr_err("cortina-access serial: Unknown PM state %d\n", state);
-	}
-	writel(reg_v, port->membase + CFG);
-}
-
-#ifdef CONFIG_CONSOLE_POLL
-static int cortina_poll_get_char(struct uart_port *port)
-{
-	unsigned int rx;
-
-	if (readl(port->membase + INFO) & INFO_RX_EMPTY)
-		return NO_POLL_CHAR;
-
-	rx = readl(port->membase + RX_DAT);
-
-	return rx;
-}
-
-static void cortina_poll_put_char(struct uart_port *port, unsigned char c)
-{
-	unsigned long time_out;
-
-	time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
-
-	while (time_before(jiffies, time_out) &&
-		(readl(port->membase + INFO) & INFO_TX_FULL))
-		cpu_relax();
-
-	/* Give up if FIFO stuck! */
-	if ((readl(port->membase + INFO) & INFO_TX_FULL))
-		return;
-
-	writel(c, port->membase + TX_DAT);
-}
-
-#endif
-
-static const struct uart_ops cortina_uart_ops = {
-	.tx_empty = cortina_uart_tx_empty,
-	.set_mctrl = cortina_uart_set_mctrl,
-	.get_mctrl = cortina_uart_get_mctrl,
-	.stop_tx = cortina_uart_stop_tx,
-	.start_tx = cortina_uart_start_tx,
-	.stop_rx = cortina_uart_stop_rx,
-	.enable_ms = cortina_uart_enable_ms,
-	.startup = cortina_uart_startup,
-	.shutdown = cortina_uart_shutdown,
-	.set_termios = cortina_uart_set_termios,
-	.type = cortina_uart_type,
-	.config_port = cortina_uart_config_port,
-	.verify_port = cortina_uart_verify_port,
-	.pm = cortina_access_power,
-#ifdef CONFIG_CONSOLE_POLL
-	.poll_get_char = cortina_poll_get_char,
-	.poll_put_char = cortina_poll_put_char,
-#endif
-};
-
-static inline void cortina_uart_interrupt_rx_chars(struct uart_port *port,
-						   unsigned long status)
-{
-	struct tty_port *ttyport = &port->state->port;
-	unsigned int ch;
-	unsigned int rx, flg;
-	struct cortina_uart_port *pca_port;
-
-	rx = readl(port->membase + INFO);
-	if (INFO_RX_EMPTY & rx)
-		return;
-
-	if (status & RX_FIFO_OVERRUNE)
-		port->icount.overrun++;
-
-	pca_port = cortina_uart_get_port(port->line);
-
-	/* Read the character while FIFO is not empty */
-	do {
-		flg = TTY_NORMAL;
-		port->icount.rx++;
-		ch = readl(port->membase + RX_DAT);
-		if (status & RX_PARITY_ERRE) {
-			port->icount.parity++;
-			flg = TTY_PARITY;
-		}
-
-		if (pca_port->has_bi) {
-			/* If BI supported ? */
-			if (status & RX_BREAK) {
-				port->icount.brk++;
-				if (uart_handle_break(port))
-					goto ignore;
-			}
-		} else {
-			/* Treat stop err as BI */
-			if (status & RX_STOP_ERRE) {
-				port->icount.brk++;
-				if (uart_handle_break(port))
-					goto ignore;
-			}
-		}
-		if (!(ch & 0x100)) /* RX char is not valid */
-			goto ignore;
-
-		if (uart_handle_sysrq_char(port, (unsigned char)ch))
-			goto ignore;
-
-		tty_insert_flip_char(ttyport, ch, flg);
- ignore:
-		rx = readl(port->membase + INFO);
-	} while (!(INFO_RX_EMPTY & rx));
-
-	spin_unlock(&port->lock);
-	tty_flip_buffer_push(ttyport);
-	spin_lock(&port->lock);
-}
-
-static inline void cortina_uart_interrupt_tx_chars(struct uart_port *port)
-{
-	struct circ_buf *xmit = &port->state->xmit;
-
-	/* Process out of band chars */
-	if (port->x_char) {
-		/* Send next char */
-		writel(port->x_char, port->membase + TX_DAT);
-		goto done;
-	}
-
-	/* Nothing to do ? */
-	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
-		cortina_uart_stop_tx(port);
-		goto done;
-	}
-
-	cortina_transmit_buffer(port);
-
-	/* Wake up */
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(port);
-
-	/* Maybe we're done after all */
-	if (uart_circ_empty(xmit))
-		cortina_uart_stop_tx(port);
-
- done:
-	return;
-}
-
-irqreturn_t cortina_uart_interrupt(int irq, void *dev_id)
-{
-	struct uart_port *port = (struct uart_port *)dev_id;
-	unsigned int irq_status;
-
-	spin_lock(&port->lock);
-
-	/* Clear interrupt! */
-	irq_status = readl(port->membase + INT);
-	writel(irq_status, port->membase + INT);
-
-	/* Process any Rx chars first */
-	cortina_uart_interrupt_rx_chars(port, irq_status);
-	/* Then use any Tx space */
-	cortina_uart_interrupt_tx_chars(port);
-
-	spin_unlock(&port->lock);
-
-	return IRQ_HANDLED;
-}
-
-#ifdef CONFIG_SERIAL_CORTINA_ACCESS_CONSOLE
-void cortina_console_write(struct console *co, const char *s,
-			   unsigned int count)
-{
-	struct uart_port *port;
-	struct cortina_uart_port *pca_port;
-	unsigned int i, previous;
-	unsigned long flags;
-	int locked;
-
-	pca_port = cortina_uart_get_port(co->index);
-	port = &pca_port->uart;
-
-	local_irq_save(flags);
-	if (port->sysrq) {
-		locked = 0;
-	} else if (oops_in_progress) {
-		locked = spin_trylock(&port->lock);
-	} else {
-		spin_lock(&port->lock);
-		locked = 1;
-	}
-
-	/* Save current state */
-	previous = readl(port->membase + IE);
-	/* Disable Tx interrupts so this all goes out in one go */
-	cortina_uart_stop_tx(port);
-
-	/* Write all the chars */
-	for (i = 0; i < count; i++) {
-		/* Wait the TX buffer to be empty, which can't take forever */
-		while (!(readl(port->membase + INFO) & INFO_TX_EMPTY))
-			cpu_relax();
-
-		/* Send the char */
-		writel(*s, port->membase + TX_DAT);
-
-		/* CR/LF stuff */
-		if (*s++ == '\n') {
-			/* Wait the TX buffer to be empty */
-			while (!(readl(port->membase + INFO) & INFO_TX_EMPTY))
-				cpu_relax();
-			writel('\r', port->membase + TX_DAT);
-		}
-	}
-
-	writel(previous, port->membase + IE);	/* Put it all back */
-
-	if (locked)
-		spin_unlock(&port->lock);
-	local_irq_restore(flags);
-}
-
-static int __init cortina_console_setup(struct console *co, char *options)
-{
-	struct uart_port *port;
-	struct cortina_uart_port *pca_port;
-	int baud = 115200;
-	int bits = 8;
-	int parity = 'n';
-	int flow = 'n';
-
-	if (co->index < 0 || co->index >= UART_NR)
-		return -ENODEV;
-
-	pca_port = cortina_uart_get_port(co->index);
-	port = &pca_port->uart;
-
-	/* This isn't going to do much, but it might change the baud rate. */
-	if (options)
-		uart_parse_options(options, &baud, &parity, &bits, &flow);
-
-	return uart_set_options(port, co, baud, parity, bits, flow);
-}
-
-static struct uart_driver cortina_uart_driver;
-
-static struct console cortina_console = {
-	.name = "ttyS",
-	.write = cortina_console_write,
-	.device = uart_console_device,
-	.setup = cortina_console_setup,
-	.flags = CON_PRINTBUFFER,
-	.index = -1,		/* Only possible option. */
-	.data = &cortina_uart_driver,
-};
-#define CORTINA_CONSOLE (&cortina_console)
-
-/* Support EARLYCON */
-static void cortina_putc(struct uart_port *port, int c)
-{
-	unsigned int tmout;
-
-	/* No jiffie at early boot stage!
-	 * Wait up to 5ms for the character to be sent.
-	 */
-	tmout = TX_TIMEOUT;
-	while (--tmout) {
-		if (!(readl(port->membase + INFO) & INFO_TX_FULL))
-			break;
-		udelay(1);
-	}
-
-	/* Give up if FIFO stuck! */
-	while ((readl(port->membase + INFO) & INFO_TX_FULL))
-		return;
-
-	/* Send the char */
-	writel(c, port->membase + TX_DAT);
-}
-
-static void cortina_early_write(struct console *con, const char *s,
-				unsigned int n)
-{
-	struct earlycon_device *dev = con->data;
-
-	uart_console_write(&dev->port, s, n, cortina_putc);
-}
-
-static int __init cortina_early_console_setup(struct earlycon_device *device,
-					      const char *opt)
-{
-	if (!device->port.membase)
-		return -ENODEV;
-
-	device->con->write = cortina_early_write;
-	return 0;
-}
-
-EARLYCON_DECLARE(serial, cortina_early_console_setup);
-OF_EARLYCON_DECLARE(serial, "cortina-access,serial", cortina_early_console_setup);
-#else
-#define CORTINA_CONSOLE	NULL
-#endif
-
-static struct uart_driver cortina_uart_driver = {
-	.owner = THIS_MODULE,
-	.driver_name = "cortina-access_uart",
-	.dev_name = "ttyS",
-	.major = TTY_MAJOR,
-	.minor = 64,
-	.nr = UART_NR,
-	.cons = CORTINA_CONSOLE,
-};
-
-/* Match table for of_platform binding */
-static const struct of_device_id cortina_uart_of_match[] = {
-	{.compatible = "cortina-access,serial",},
-	{}
-};
-MODULE_DEVICE_TABLE(of, cortina_uart_of_match);
-
-static int serial_cortina_probe(struct platform_device *pdev)
-{
-	int ret;
-	void __iomem *base;
-	struct cortina_uart_port *port;
-	const struct of_device_id *match;
-
-	/* assign DT node pointer */
-	struct device_node *np = pdev->dev.of_node;
-	struct resource mem_resource;
-	u32 of_clock_frequency;
-	struct clk *pclk_info;
-	int uart_idx;
-
-	/* search DT for a match */
-	match = of_match_device(cortina_uart_of_match, &pdev->dev);
-	if (!match)
-		return -EINVAL;
-
-	if (cortina_uart_ports == NULL)
-		cortina_uart_ports = kzalloc(UART_NR * sizeof(struct cortina_uart_port),
-					     GFP_KERNEL);
-
-	port = cortina_uart_ports;
-	for (uart_idx = 0; uart_idx < UART_NR; ++uart_idx) {
-		/* Find first empty slot */
-		if (strlen(port->name) == 0)
-			break;
-		port++;
-	}
-
-	if (uart_idx >= UART_NR)
-		return -EINVAL;
-
-	snprintf(port->name, sizeof(port->name), "Cortina-Access UART%d", uart_idx);
-
-	/* Retrieve HW base address */
-	ret = of_address_to_resource(np, 0, &mem_resource);
-	if (ret) {
-		dev_warn(&pdev->dev, "invalid address %d\n", ret);
-		return ret;
-	}
-
-	base = devm_ioremap(&pdev->dev, mem_resource.start,
-			    resource_size(&mem_resource));
-	if (!base) {
-		devm_kfree(&pdev->dev, port);
-		return -ENOMEM;
-	}
-
-	/* assign reg base and irq from DT */
-	port->uart.irq = irq_of_parse_and_map(np, 0);
-	port->uart.membase = base;
-	port->uart.mapbase = mem_resource.start;
-	port->uart.ops = &cortina_uart_ops;
-	port->uart.dev = &pdev->dev;
-	port->uart.line = uart_idx;
-	port->uart.has_sysrq = IS_ENABLED(CONFIG_SERIAL_CORTINA_ACCESS_CONSOLE);
-
-	/* get clock-freqency tuple from DT and store value */
-	if (of_property_read_u32(np, "clock-frequency", &of_clock_frequency)) {
-		/* If we are here, it means DT node did not contain
-		 * clock-frequency tuple. Therefore, instead try to get
-		 * clk rate through the clk driver that DT has stated
-		 * we are consuming.
-		 */
-		pclk_info = clk_get(&pdev->dev, NULL);
-		if (IS_ERR(pclk_info)) {
-			dev_warn(&pdev->dev,
-				 "clk or clock-frequency not defined\n");
-			return PTR_ERR(pclk_info);
-		}
-
-		clk_prepare_enable(pclk_info);
-		of_clock_frequency = clk_get_rate(pclk_info);
-	}
-	port->uart.uartclk = of_clock_frequency;
-
-	if (of_property_read_bool(np, "wakeup-source"))
-		port->may_wakeup = true;
-	if (of_property_read_bool(np, "break-indicator"))
-		port->has_bi = true;
-
-	port->uart.type = PORT_UNKNOWN;
-
-	if (port->may_wakeup)
-		device_init_wakeup(&pdev->dev, true);
-
-	ret = uart_add_one_port(&cortina_uart_driver, &port->uart);
-	if (ret)
-		return ret;
-
-	platform_set_drvdata(pdev, port);
-
-	return 0;
-}
-
-static int serial_cortina_remove(struct platform_device *pdev)
-{
-	struct uart_port *port = platform_get_drvdata(pdev);
-	struct cortina_uart_port *pca_port;
-
-	if (port) {
-		pca_port = cortina_uart_get_port(port->line);
-		memset(pca_port->name, 0, CA_UART_NAME_LEN);
-		uart_remove_one_port(&cortina_uart_driver, port);
-	}
-
-	platform_set_drvdata(pdev, NULL);
-	return 0;
-}
-
-#ifdef CONFIG_PM
-static int serial_cortina_suspend(struct platform_device *pdev,
-				  pm_message_t state)
-{
-	struct cortina_uart_port *p =
-	    (struct cortina_uart_port *)pdev->dev.driver_data;
-
-	uart_suspend_port(&cortina_uart_driver, &p->uart);
-
-	return 0;
-}
-
-static int serial_cortina_resume(struct platform_device *pdev)
-{
-	struct cortina_uart_port *p =
-	    (struct cortina_uart_port *)pdev->dev.driver_data;
-
-	uart_resume_port(&cortina_uart_driver, &p->uart);
-
-	return 0;
-}
-#else
-#define serial_cortina_suspend NULL
-#define serial_cortina_resume NULL
-#endif
-
-static struct platform_driver serial_cortina_driver = {
-	.probe = serial_cortina_probe,
-	.remove = serial_cortina_remove,
-#ifdef CONFIG_PM
-	.suspend = serial_cortina_suspend,
-	.resume = serial_cortina_resume,
-#endif
-	.driver = {
-		   .name = "cortina-access_serial",
-		   .owner = THIS_MODULE,
-		   .of_match_table = cortina_uart_of_match,
-	},
-};
-
-static int __init cortina_uart_init(void)
-{
-	int ret;
-
-	ret = uart_register_driver(&cortina_uart_driver);
-	if (ret)
-		return ret;
-
-	ret = platform_driver_register(&serial_cortina_driver);
-	if (ret)
-		uart_unregister_driver(&cortina_uart_driver);
-
-	return ret;
-}
-
-static void __exit cortina_uart_exit(void)
-{
-	platform_driver_unregister(&serial_cortina_driver);
-	uart_unregister_driver(&cortina_uart_driver);
-}
-
-module_init(cortina_uart_init);
-module_exit(cortina_uart_exit);
-
-MODULE_AUTHOR("Cortina-Access Inc.");
-MODULE_DESCRIPTION(" Cortina-Access UART driver");
-MODULE_LICENSE("GPL");