path: root/target/linux/lantiq/patches/200-serial.patch

--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -1397,6 +1397,14 @@
 	help
 	  Support for Console on the NWP serial ports.
 
+config SERIAL_LANTIQ
+	bool "Lantiq serial driver"
+	depends on LANTIQ
+	select SERIAL_CORE
+	select SERIAL_CORE_CONSOLE
+	help
+	  Driver for the Lantiq SoC ASC hardware
+
 config SERIAL_QE
 	tristate "Freescale QUICC Engine serial port support"
 	depends on QUICC_ENGINE
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -84,3 +84,4 @@
 obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o
 obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o
 obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o
+obj-$(CONFIG_SERIAL_LANTIQ) += lantiq.o
--- /dev/null
+++ b/drivers/serial/lantiq.c
@@ -0,0 +1,772 @@
+/*
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Copyright (C) 2004 Infineon IFAP DC COM CPE
+ * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
+ * Copyright (C) 2010 Thomas Langer, Lantiq Deutschland
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#define lq_r32(reg)			__raw_readl(reg)
+#define lq_r8(reg)				__raw_readb(reg)
+#define lq_w32(val, reg)			__raw_writel(val, reg)
+#define lq_w8(val, reg)			__raw_writeb(val, reg)
+#define lq_w32_mask(clear, set, reg)	lq_w32((lq_r32(reg) & ~(clear)) | (set), reg)
+
+#define PORT_IFXMIPSASC		111
+#define MAXPORTS		2
+
+#define UART_DUMMY_UER_RX 1
+
+#define DRVNAME "lq_asc"
+
+#ifdef __BIG_ENDIAN
+#define IFXMIPS_ASC_TBUF		(0x0020 + 3)
+#define IFXMIPS_ASC_RBUF		(0x0024 + 3)
+#else
+#define IFXMIPS_ASC_TBUF		0x0020
+#define IFXMIPS_ASC_RBUF		0x0024
+#endif
+
+#define IFXMIPS_ASC_FSTAT		0x0048
+#define IFXMIPS_ASC_WHBSTATE		0x0018
+#define IFXMIPS_ASC_STATE		0x0014
+#define IFXMIPS_ASC_IRNCR		0x00F8
+#define IFXMIPS_ASC_CLC			0x0000
+#define IFXMIPS_ASC_ID			0x0008
+#define IFXMIPS_ASC_PISEL		0x0004
+#define IFXMIPS_ASC_TXFCON		0x0044
+#define IFXMIPS_ASC_RXFCON		0x0040
+#define IFXMIPS_ASC_CON			0x0010
+#define IFXMIPS_ASC_BG			0x0050
+#define IFXMIPS_ASC_IRNREN		0x00F4
+
+#define ASC_IRNREN_TX			0x1
+#define ASC_IRNREN_RX			0x2
+#define ASC_IRNREN_ERR			0x4
+#define ASC_IRNREN_TX_BUF		0x8
+#define ASC_IRNCR_TIR			0x1
+#define ASC_IRNCR_RIR			0x2
+#define ASC_IRNCR_EIR			0x4
+
+#define ASCOPT_CSIZE			0x3
+#define ASCOPT_CS7			0x1
+#define ASCOPT_CS8			0x2
+#define ASCOPT_PARENB			0x4
+#define ASCOPT_STOPB			0x8
+#define ASCOPT_PARODD			0x0
+#define ASCOPT_CREAD			0x20
+#define TXFIFO_FL			1
+#define RXFIFO_FL			1
+#define ASCCLC_DISS			0x2
+#define ASCCLC_RMCMASK			0x0000FF00
+#define ASCCLC_RMCOFFSET		8
+#define ASCCON_M_8ASYNC			0x0
+#define ASCCON_M_7ASYNC			0x2
+#define ASCCON_ODD			0x00000020
+#define ASCCON_STP			0x00000080
+#define ASCCON_BRS			0x00000100
+#define ASCCON_FDE			0x00000200
+#define ASCCON_R			0x00008000
+#define ASCCON_FEN			0x00020000
+#define ASCCON_ROEN			0x00080000
+#define ASCCON_TOEN			0x00100000
+#define ASCSTATE_PE			0x00010000
+#define ASCSTATE_FE			0x00020000
+#define ASCSTATE_ROE			0x00080000
+#define ASCSTATE_ANY			(ASCSTATE_ROE|ASCSTATE_PE|ASCSTATE_FE)
+#define ASCWHBSTATE_CLRREN		0x00000001
+#define ASCWHBSTATE_SETREN		0x00000002
+#define ASCWHBSTATE_CLRPE		0x00000004
+#define ASCWHBSTATE_CLRFE		0x00000008
+#define ASCWHBSTATE_CLRROE		0x00000020
+#define ASCTXFCON_TXFEN			0x0001
+#define ASCTXFCON_TXFFLU		0x0002
+#define ASCTXFCON_TXFITLMASK		0x3F00
+#define ASCTXFCON_TXFITLOFF		8
+#define ASCRXFCON_RXFEN			0x0001
+#define ASCRXFCON_RXFFLU		0x0002
+#define ASCRXFCON_RXFITLMASK		0x3F00
+#define ASCRXFCON_RXFITLOFF		8
+#define ASCFSTAT_RXFFLMASK		0x003F
+#define ASCFSTAT_TXFFLMASK		0x3F00
+#define ASCFSTAT_TXFFLOFF		8
+#define ASCFSTAT_RXFREEMASK		0x003F0000
+#define ASCFSTAT_RXFREEOFF		16
+#define ASCFSTAT_TXFREEMASK		0x3F000000
+#define ASCFSTAT_TXFREEOFF		24
+
+static void lqasc_tx_chars(struct uart_port *port);
+extern void prom_printf(const char *fmt, ...);
+static struct lq_uart_port *lqasc_port[2];
+static struct uart_driver lqasc_reg;
+
+struct lq_uart_port {
+	struct uart_port	port;
+	struct clk			*clk;
+	unsigned int		tx_irq;
+	unsigned int		rx_irq;
+	unsigned int		err_irq;
+};
+
+static inline struct
+lq_uart_port *to_lq_uart_port(struct uart_port *port)
+{
+	return container_of(port, struct lq_uart_port, port);
+}
+
+static void
+lqasc_stop_tx(struct uart_port *port)
+{
+	return;
+}
+
+static void
+lqasc_start_tx(struct uart_port *port)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	lqasc_tx_chars(port);
+	local_irq_restore(flags);
+	return;
+}
+
+static void
+lqasc_stop_rx(struct uart_port *port)
+{
+	lq_w32(ASCWHBSTATE_CLRREN, port->membase + IFXMIPS_ASC_WHBSTATE);
+}
+
+static void
+lqasc_enable_ms(struct uart_port *port)
+{
+}
+
+static void
+lqasc_rx_chars(struct uart_port *port)
+{
+	struct tty_struct *tty = port->state->port.tty;
+	unsigned int ch = 0, rsr = 0, fifocnt;
+
+	fifocnt = lq_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
+	while (fifocnt--) {
+		u8 flag = TTY_NORMAL;
+		ch = lq_r8(port->membase + IFXMIPS_ASC_RBUF);
+		rsr = (lq_r32(port->membase + IFXMIPS_ASC_STATE)
+			& ASCSTATE_ANY) | UART_DUMMY_UER_RX;
+		tty_flip_buffer_push(tty);
+		port->icount.rx++;
+
+		/*
+		 * Note that the error handling code is
+		 * out of the main execution path
+		 */
+		if (rsr & ASCSTATE_ANY) {
+			if (rsr & ASCSTATE_PE) {
+				port->icount.parity++;
+				lq_w32_mask(0, ASCWHBSTATE_CLRPE,
+					port->membase + IFXMIPS_ASC_WHBSTATE);
+			} else if (rsr & ASCSTATE_FE) {
+				port->icount.frame++;
+				lq_w32_mask(0, ASCWHBSTATE_CLRFE,
+					port->membase + IFXMIPS_ASC_WHBSTATE);
+			}
+			if (rsr & ASCSTATE_ROE) {
+				port->icount.overrun++;
+				lq_w32_mask(0, ASCWHBSTATE_CLRROE,
+					port->membase + IFXMIPS_ASC_WHBSTATE);
+			}
+
+			rsr &= port->read_status_mask;
+
+			if (rsr & ASCSTATE_PE)
+				flag = TTY_PARITY;
+			else if (rsr & ASCSTATE_FE)
+				flag = TTY_FRAME;
+		}
+
+		if ((rsr & port->ignore_status_mask) == 0)
+			tty_insert_flip_char(tty, ch, flag);
+
+		if (rsr & ASCSTATE_ROE)
+			/*
+			 * Overrun is special, since it's reported
+			 * immediately, and doesn't affect the current
+			 * character
+			 */
+			tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+	}
+	if (ch != 0)
+		tty_flip_buffer_push(tty);
+	return;
+}
+
+static void
+lqasc_tx_chars(struct uart_port *port)
+{
+	struct circ_buf *xmit = &port->state->xmit;
+	if (uart_tx_stopped(port)) {
+		lqasc_stop_tx(port);
+		return;
+	}
+
+	while (((lq_r32(port->membase + IFXMIPS_ASC_FSTAT) &
+		ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF) != 0) {
+		if (port->x_char) {
+			lq_w8(port->x_char, port->membase + IFXMIPS_ASC_TBUF);
+			port->icount.tx++;
+			port->x_char = 0;
+			continue;
+		}
+
+		if (uart_circ_empty(xmit))
+			break;
+
+		lq_w8(port->state->xmit.buf[port->state->xmit.tail],
+			port->membase + IFXMIPS_ASC_TBUF);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		port->icount.tx++;
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+}
+
+static irqreturn_t
+lqasc_tx_int(int irq, void *_port)
+{
+	struct uart_port *port = (struct uart_port *)_port;
+	lq_w32(ASC_IRNCR_TIR, port->membase + IFXMIPS_ASC_IRNCR);
+	lqasc_start_tx(port);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t
+lqasc_err_int(int irq, void *_port)
+{
+	struct uart_port *port = (struct uart_port *)_port;
+	/* clear any pending interrupts */
+	lq_w32_mask(0, ASCWHBSTATE_CLRPE | ASCWHBSTATE_CLRFE | ASCWHBSTATE_CLRROE,
+		port->membase + IFXMIPS_ASC_WHBSTATE);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t
+lqasc_rx_int(int irq, void *_port)
+{
+	struct uart_port *port = (struct uart_port *)_port;
+	lq_w32(ASC_IRNCR_RIR, port->membase + IFXMIPS_ASC_IRNCR);
+	lqasc_rx_chars(port);
+	return IRQ_HANDLED;
+}
+
+static unsigned int
+lqasc_tx_empty(struct uart_port *port)
+{
+	int status;
+	status = lq_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK;
+	return status ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int
+lqasc_get_mctrl(struct uart_port *port)
+{
+	return TIOCM_CTS | TIOCM_CAR | TIOCM_DSR;
+}
+
+static void
+lqasc_set_mctrl(struct uart_port *port, u_int mctrl)
+{
+}
+
+static void
+lqasc_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+static int
+lqasc_startup(struct uart_port *port)
+{
+	struct lq_uart_port *ifx_port = to_lq_uart_port(port);
+	int retval;
+
+	port->uartclk = clk_get_rate(ifx_port->clk);
+
+	lq_w32_mask(ASCCLC_DISS | ASCCLC_RMCMASK, (1 << ASCCLC_RMCOFFSET),
+		port->membase + IFXMIPS_ASC_CLC);
+
+	lq_w32(0, port->membase + IFXMIPS_ASC_PISEL);
+	lq_w32(
+		((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) |
+		ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU,
+		port->membase + IFXMIPS_ASC_TXFCON);
+	lq_w32(
+		((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK)
+		| ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU,
+		port->membase + IFXMIPS_ASC_RXFCON);
+	/* make sure other settings are written to hardware before setting enable bits */
+	wmb();
+	lq_w32_mask(0, ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN |
+		ASCCON_ROEN, port->membase + IFXMIPS_ASC_CON);
+
+	retval = request_irq(ifx_port->tx_irq, lqasc_tx_int,
+		IRQF_DISABLED, "asc_tx", port);
+	if (retval) {
+		pr_err("failed to request lqasc_tx_int\n");
+		return retval;
+	}
+
+	retval = request_irq(ifx_port->rx_irq, lqasc_rx_int,
+		IRQF_DISABLED, "asc_rx", port);
+	if (retval) {
+		pr_err("failed to request lqasc_rx_int\n");
+		goto err1;
+	}
+
+	retval = request_irq(ifx_port->err_irq, lqasc_err_int,
+		IRQF_DISABLED, "asc_err", port);
+	if (retval) {
+		pr_err("failed to request lqasc_err_int\n");
+		goto err2;
+	}
+
+	lq_w32(ASC_IRNREN_RX | ASC_IRNREN_ERR | ASC_IRNREN_TX,
+		port->membase + IFXMIPS_ASC_IRNREN);
+	return 0;
+
+err2:
+	free_irq(ifx_port->rx_irq, port);
+err1:
+	free_irq(ifx_port->tx_irq, port);
+	return retval;
+}
+
+static void
+lqasc_shutdown(struct uart_port *port)
+{
+	struct lq_uart_port *ifx_port = to_lq_uart_port(port);
+	free_irq(ifx_port->tx_irq, port);
+	free_irq(ifx_port->rx_irq, port);
+	free_irq(ifx_port->err_irq, port);
+
+	lq_w32(0, port->membase + IFXMIPS_ASC_CON);
+	lq_w32_mask(ASCRXFCON_RXFEN, ASCRXFCON_RXFFLU,
+		port->membase + IFXMIPS_ASC_RXFCON);
+	lq_w32_mask(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU,
+		port->membase + IFXMIPS_ASC_TXFCON);
+}
+
+static void
+lqasc_set_termios(struct uart_port *port,
+	struct ktermios *new, struct ktermios *old)
+{
+	unsigned int cflag;
+	unsigned int iflag;
+	unsigned int quot;
+	unsigned int baud;
+	unsigned int con = 0;
+	unsigned long flags;
+
+	cflag = new->c_cflag;
+	iflag = new->c_iflag;
+
+	switch (cflag & CSIZE) {
+	case CS7:
+		con = ASCCON_M_7ASYNC;
+		break;
+
+	case CS5:
+	case CS6:
+	default:
+		con = ASCCON_M_8ASYNC;
+		break;
+	}
+
+	if (cflag & CSTOPB)
+		con |= ASCCON_STP;
+
+	if (cflag & PARENB) {
+		if (!(cflag & PARODD))
+			con &= ~ASCCON_ODD;
+		else
+			con |= ASCCON_ODD;
+	}
+
+	port->read_status_mask = ASCSTATE_ROE;
+	if (iflag & INPCK)
+		port->read_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
+
+	port->ignore_status_mask = 0;
+	if (iflag & IGNPAR)
+		port->ignore_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
+
+	if (iflag & IGNBRK) {
+		/*
+		 * If we're ignoring parity and break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (iflag & IGNPAR)
+			port->ignore_status_mask |= ASCSTATE_ROE;
+	}
+
+	if ((cflag & CREAD) == 0)
+		port->ignore_status_mask |= UART_DUMMY_UER_RX;
+
+	/* set error signals  - framing, parity  and overrun, enable receiver */
+	con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN;
+
+	local_irq_save(flags);
+
+	/* set up CON */
+	lq_w32_mask(0, con, port->membase + IFXMIPS_ASC_CON);
+
+	/* Set baud rate - take a divider of 2 into account */
+	baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
+	quot = uart_get_divisor(port, baud);
+	quot = quot / 2 - 1;
+
+	/* disable the baudrate generator */
+	lq_w32_mask(ASCCON_R, 0, port->membase + IFXMIPS_ASC_CON);
+
+	/* make sure the fractional divider is off */
+	lq_w32_mask(ASCCON_FDE, 0, port->membase + IFXMIPS_ASC_CON);
+
+	/* set up to use divisor of 2 */
+	lq_w32_mask(ASCCON_BRS, 0, port->membase + IFXMIPS_ASC_CON);
+
+	/* now we can write the new baudrate into the register */
+	lq_w32(quot, port->membase + IFXMIPS_ASC_BG);
+
+	/* turn the baudrate generator back on */
+	lq_w32_mask(0, ASCCON_R, port->membase + IFXMIPS_ASC_CON);
+
+	/* enable rx */
+	lq_w32(ASCWHBSTATE_SETREN, port->membase + IFXMIPS_ASC_WHBSTATE);
+
+	local_irq_restore(flags);
+}
+
+static const char*
+lqasc_type(struct uart_port *port)
+{
+	if (port->type == PORT_IFXMIPSASC)
+		return DRVNAME;
+	else
+		return NULL;
+}
+
+static void
+lqasc_release_port(struct uart_port *port)
+{
+	if (port->flags & UPF_IOREMAP) {
+		iounmap(port->membase);
+		port->membase = NULL;
+	}
+}
+
+static int
+lqasc_request_port(struct uart_port *port)
+{
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct resource *mmres;
+	int size;
+
+	mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mmres)
+		return -ENODEV;
+	size = resource_size(mmres);
+
+	if (port->flags & UPF_IOREMAP) {
+		port->membase = ioremap_nocache(port->mapbase, size);
+		if (port->membase == NULL)
+			return -ENOMEM;
+	}
+	return 0;
+}
+
+static void
+lqasc_config_port(struct uart_port *port, int flags)
+{
+	if (flags & UART_CONFIG_TYPE) {
+		port->type = PORT_IFXMIPSASC;
+		lqasc_request_port(port);
+	}
+}
+
+static int
+lqasc_verify_port(struct uart_port *port,
+	struct serial_struct *ser)
+{
+	int ret = 0;
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_IFXMIPSASC)
+		ret = -EINVAL;
+	if (ser->irq < 0 || ser->irq >= NR_IRQS)
+		ret = -EINVAL;
+	if (ser->baud_base < 9600)
+		ret = -EINVAL;
+	return ret;
+}
+
+static struct uart_ops lqasc_pops = {
+	.tx_empty =	lqasc_tx_empty,
+	.set_mctrl =	lqasc_set_mctrl,
+	.get_mctrl =	lqasc_get_mctrl,
+	.stop_tx =	lqasc_stop_tx,
+	.start_tx =	lqasc_start_tx,
+	.stop_rx =	lqasc_stop_rx,
+	.enable_ms =	lqasc_enable_ms,
+	.break_ctl =	lqasc_break_ctl,
+	.startup =	lqasc_startup,
+	.shutdown =	lqasc_shutdown,
+	.set_termios =	lqasc_set_termios,
+	.type =		lqasc_type,
+	.release_port =	lqasc_release_port,
+	.request_port =	lqasc_request_port,
+	.config_port =	lqasc_config_port,
+	.verify_port =	lqasc_verify_port,
+};
+
+static void
+lqasc_console_putchar(struct uart_port *port, int ch)
+{
+	int fifofree;
+
+	if (!port->membase)
+		return;
+
+	do {
+		fifofree = (lq_r32(port->membase + IFXMIPS_ASC_FSTAT)
+			& ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF;
+	} while (fifofree == 0);
+	lq_w8(ch, port->membase + IFXMIPS_ASC_TBUF);
+}
+
+
+static void
+lqasc_console_write(struct console *co, const char *s, u_int count)
+{
+	struct lq_uart_port *ifx_port;
+	struct uart_port *port;
+	unsigned long flags;
+
+	if (co->index >= MAXPORTS)
+		return;
+
+	ifx_port = lqasc_port[co->index];
+	if (!ifx_port)
+		return;
+
+	port = &ifx_port->port;
+
+	local_irq_save(flags);
+	uart_console_write(port, s, count, lqasc_console_putchar);
+	local_irq_restore(flags);
+}
+
+static int __init
+lqasc_console_setup(struct console *co, char *options)
+{
+	struct lq_uart_port *ifx_port;
+	struct uart_port *port;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	if (co->index >= MAXPORTS)
+		return -ENODEV;
+
+	ifx_port = lqasc_port[co->index];
+	if (!ifx_port)
+		return -ENODEV;
+
+	port = &ifx_port->port;
+
+	port->uartclk = clk_get_rate(ifx_port->clk);
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+	return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct console lqasc_console = {
+	.name =		"ttyS",
+	.write =	lqasc_console_write,
+	.device =	uart_console_device,
+	.setup =	lqasc_console_setup,
+	.flags =	CON_PRINTBUFFER,
+	.index =	-1,
+	.data =		&lqasc_reg,
+};
+
+static int __init
+lqasc_console_init(void)
+{
+	register_console(&lqasc_console);
+	return 0;
+}
+console_initcall(lqasc_console_init);
+
+static struct uart_driver lqasc_reg = {
+	.owner =	THIS_MODULE,
+	.driver_name =	DRVNAME,
+	.dev_name =	"ttyS",
+	.major =	TTY_MAJOR,
+	.minor =	64,
+	.nr =		MAXPORTS,
+	.cons =		&lqasc_console,
+};
+
+static int __devinit
+lqasc_probe(struct platform_device *pdev)
+{
+	struct lq_uart_port *ifx_port;
+	struct uart_port *port;
+	struct resource *mmres, *irqres;
+	int tx_irq, rx_irq, err_irq;
+	struct clk *clk;
+	int ret;
+
+	mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!mmres || !irqres)
+		return -ENODEV;
+
+	if (pdev->id >= MAXPORTS)
+		return -EBUSY;
+
+	if (lqasc_port[pdev->id] != NULL)
+		return -EBUSY;
+
+	clk = clk_get(&pdev->dev, "fpi");
+	if (IS_ERR(clk)) {
+		pr_err("failed to get fpi clk\n");
+		return -ENOENT;
+	}
+
+	tx_irq = platform_get_irq_byname(pdev, "tx");
+	if (tx_irq < 0) {
+		/* without named resources: assume standard irq scheme */
+		tx_irq = irqres->start;
+		rx_irq = irqres->start+2;
+		err_irq = irqres->start+3;
+	} else {
+		/* other irqs must be named also! */
+		rx_irq = platform_get_irq_byname(pdev, "rx");
+		err_irq = platform_get_irq_byname(pdev, "err");
+		if ((rx_irq < 0) | (err_irq < 0))
+			return -ENODEV;
+	}
+
+	ifx_port = kzalloc(sizeof(struct lq_uart_port), GFP_KERNEL);
+	if (!ifx_port)
+		return -ENOMEM;
+
+	port = &ifx_port->port;
+
+	port->iotype	= SERIAL_IO_MEM;
+	port->flags	= ASYNC_BOOT_AUTOCONF | UPF_IOREMAP;
+	port->ops	= &lqasc_pops;
+	port->fifosize	= 16;
+	port->type	= PORT_IFXMIPSASC,
+	port->line	= pdev->id;
+	port->dev	= &pdev->dev;
+
+	port->irq	= tx_irq; /* unused, just to be backward-compatibe */
+	port->mapbase	= mmres->start;
+
+	ifx_port->clk	= clk;
+
+	ifx_port->tx_irq = tx_irq;
+	ifx_port->rx_irq = rx_irq;
+	ifx_port->err_irq = err_irq;
+
+	lqasc_port[pdev->id] = ifx_port;
+	platform_set_drvdata(pdev, ifx_port);
+
+	ret = uart_add_one_port(&lqasc_reg, port);
+
+	return ret;
+}
+
+static int __devexit
+lqasc_remove(struct platform_device *pdev)
+{
+	struct lq_uart_port *ifx_port = platform_get_drvdata(pdev);
+	int ret;
+
+	clk_put(ifx_port->clk);
+	platform_set_drvdata(pdev, NULL);
+	lqasc_port[pdev->id] = NULL;
+	ret = uart_remove_one_port(&lqasc_reg, &ifx_port->port);
+	kfree(ifx_port);
+
+	return 0;
+}
+
+static struct platform_driver lqasc_driver = {
+	.probe		= lqasc_probe,
+	.remove		= __devexit_p(lqasc_remove),
+
+	.driver		= {
+		.name	= DRVNAME,
+		.owner	= THIS_MODULE,
+	},
+};
+
+int __init
+init_lqasc(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&lqasc_reg);
+	if (ret != 0)
+		return ret;
+
+	ret = platform_driver_register(&lqasc_driver);
+	if (ret != 0)
+		uart_unregister_driver(&lqasc_reg);
+
+	return ret;
+}
+
+void __exit
+exit_lqasc(void)
+{
+	platform_driver_unregister(&lqasc_driver);
+	uart_unregister_driver(&lqasc_reg);
+}
+
+module_init(init_lqasc);
+module_exit(exit_lqasc);
+
+MODULE_DESCRIPTION("Lantiq serial port driver");
+MODULE_LICENSE("GPL");