Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1612 insertions, 0 deletions

diff --git a/drivers/tty/serial/cpm_uart.c b/drivers/tty/serial/cpm_uart.c
new file mode 100644
index 0000000000..626423022d
--- /dev/null
+++ b/drivers/tty/serial/cpm_uart.c
@@ -0,0 +1,1612 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Driver for CPM (SCC/SMC) serial ports; core driver
+ *
+ *  Based on arch/ppc/cpm2_io/uart.c by Dan Malek
+ *  Based on ppc8xx.c by Thomas Gleixner
+ *  Based on drivers/serial/amba.c by Russell King
+ *
+ *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
+ *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
+ *
+ *  Copyright (C) 2004, 2007 Freescale Semiconductor, Inc.
+ *            (C) 2004 Intracom, S.A.
+ *            (C) 2005-2006 MontaVista Software, Inc.
+ *		Vitaly Bordug <vbordug@ru.mvista.com>
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/memblock.h>
+#include <linux/dma-mapping.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/gpio/consumer.h>
+#include <linux/clk.h>
+
+#include <sysdev/fsl_soc.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/delay.h>
+#include <asm/udbg.h>
+
+#include <linux/serial_core.h>
+#include <linux/kernel.h>
+
+#include "cpm_uart.h"
+
+
+/**************************************************************/
+
+static int  cpm_uart_tx_pump(struct uart_port *port);
+static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
+
+/**************************************************************/
+
+#define HW_BUF_SPD_THRESHOLD    2400
+
+static void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
+{
+	cpm_command(port->command, cmd);
+}
+
+/*
+ * Check, if transmit buffers are processed
+*/
+static unsigned int cpm_uart_tx_empty(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	cbd_t __iomem *bdp = pinfo->tx_bd_base;
+	int ret = 0;
+
+	while (1) {
+		if (in_be16(&bdp->cbd_sc) & BD_SC_READY)
+			break;
+
+		if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP) {
+			ret = TIOCSER_TEMT;
+			break;
+		}
+		bdp++;
+	}
+
+	pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret);
+
+	return ret;
+}
+
+static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+
+	if (pinfo->gpios[GPIO_RTS])
+		gpiod_set_value(pinfo->gpios[GPIO_RTS], !(mctrl & TIOCM_RTS));
+
+	if (pinfo->gpios[GPIO_DTR])
+		gpiod_set_value(pinfo->gpios[GPIO_DTR], !(mctrl & TIOCM_DTR));
+}
+
+static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	unsigned int mctrl = TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+	if (pinfo->gpios[GPIO_CTS]) {
+		if (gpiod_get_value(pinfo->gpios[GPIO_CTS]))
+			mctrl &= ~TIOCM_CTS;
+	}
+
+	if (pinfo->gpios[GPIO_DSR]) {
+		if (gpiod_get_value(pinfo->gpios[GPIO_DSR]))
+			mctrl &= ~TIOCM_DSR;
+	}
+
+	if (pinfo->gpios[GPIO_DCD]) {
+		if (gpiod_get_value(pinfo->gpios[GPIO_DCD]))
+			mctrl &= ~TIOCM_CAR;
+	}
+
+	if (pinfo->gpios[GPIO_RI]) {
+		if (!gpiod_get_value(pinfo->gpios[GPIO_RI]))
+			mctrl |= TIOCM_RNG;
+	}
+
+	return mctrl;
+}
+
+/*
+ * Stop transmitter
+ */
+static void cpm_uart_stop_tx(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	smc_t __iomem *smcp = pinfo->smcp;
+	scc_t __iomem *sccp = pinfo->sccp;
+
+	pr_debug("CPM uart[%d]:stop tx\n", port->line);
+
+	if (IS_SMC(pinfo))
+		clrbits8(&smcp->smc_smcm, SMCM_TX);
+	else
+		clrbits16(&sccp->scc_sccm, UART_SCCM_TX);
+}
+
+/*
+ * Start transmitter
+ */
+static void cpm_uart_start_tx(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	smc_t __iomem *smcp = pinfo->smcp;
+	scc_t __iomem *sccp = pinfo->sccp;
+
+	pr_debug("CPM uart[%d]:start tx\n", port->line);
+
+	if (IS_SMC(pinfo)) {
+		if (in_8(&smcp->smc_smcm) & SMCM_TX)
+			return;
+	} else {
+		if (in_be16(&sccp->scc_sccm) & UART_SCCM_TX)
+			return;
+	}
+
+	if (cpm_uart_tx_pump(port) != 0) {
+		if (IS_SMC(pinfo)) {
+			setbits8(&smcp->smc_smcm, SMCM_TX);
+		} else {
+			setbits16(&sccp->scc_sccm, UART_SCCM_TX);
+		}
+	}
+}
+
+/*
+ * Stop receiver
+ */
+static void cpm_uart_stop_rx(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	smc_t __iomem *smcp = pinfo->smcp;
+	scc_t __iomem *sccp = pinfo->sccp;
+
+	pr_debug("CPM uart[%d]:stop rx\n", port->line);
+
+	if (IS_SMC(pinfo))
+		clrbits8(&smcp->smc_smcm, SMCM_RX);
+	else
+		clrbits16(&sccp->scc_sccm, UART_SCCM_RX);
+}
+
+/*
+ * Generate a break.
+ */
+static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+
+	pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line,
+		break_state);
+
+	if (break_state)
+		cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
+	else
+		cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
+}
+
+/*
+ * Transmit characters, refill buffer descriptor, if possible
+ */
+static void cpm_uart_int_tx(struct uart_port *port)
+{
+	pr_debug("CPM uart[%d]:TX INT\n", port->line);
+
+	cpm_uart_tx_pump(port);
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int serial_polled;
+#endif
+
+/*
+ * Receive characters
+ */
+static void cpm_uart_int_rx(struct uart_port *port)
+{
+	int i;
+	unsigned char ch;
+	u8 *cp;
+	struct tty_port *tport = &port->state->port;
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	cbd_t __iomem *bdp;
+	u16 status;
+	unsigned int flg;
+
+	pr_debug("CPM uart[%d]:RX INT\n", port->line);
+
+	/* Just loop through the closed BDs and copy the characters into
+	 * the buffer.
+	 */
+	bdp = pinfo->rx_cur;
+	for (;;) {
+#ifdef CONFIG_CONSOLE_POLL
+		if (unlikely(serial_polled)) {
+			serial_polled = 0;
+			return;
+		}
+#endif
+		/* get status */
+		status = in_be16(&bdp->cbd_sc);
+		/* If this one is empty, return happy */
+		if (status & BD_SC_EMPTY)
+			break;
+
+		/* get number of characters, and check spce in flip-buffer */
+		i = in_be16(&bdp->cbd_datlen);
+
+		/* If we have not enough room in tty flip buffer, then we try
+		 * later, which will be the next rx-interrupt or a timeout
+		 */
+		if (tty_buffer_request_room(tport, i) < i) {
+			printk(KERN_WARNING "No room in flip buffer\n");
+			return;
+		}
+
+		/* get pointer */
+		cp = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
+
+		/* loop through the buffer */
+		while (i-- > 0) {
+			ch = *cp++;
+			port->icount.rx++;
+			flg = TTY_NORMAL;
+
+			if (status &
+			    (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
+				goto handle_error;
+			if (uart_handle_sysrq_char(port, ch))
+				continue;
+#ifdef CONFIG_CONSOLE_POLL
+			if (unlikely(serial_polled)) {
+				serial_polled = 0;
+				return;
+			}
+#endif
+		      error_return:
+			tty_insert_flip_char(tport, ch, flg);
+
+		}		/* End while (i--) */
+
+		/* This BD is ready to be used again. Clear status. get next */
+		clrbits16(&bdp->cbd_sc, BD_SC_BR | BD_SC_FR | BD_SC_PR |
+		                        BD_SC_OV | BD_SC_ID);
+		setbits16(&bdp->cbd_sc, BD_SC_EMPTY);
+
+		if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+			bdp = pinfo->rx_bd_base;
+		else
+			bdp++;
+
+	} /* End for (;;) */
+
+	/* Write back buffer pointer */
+	pinfo->rx_cur = bdp;
+
+	/* activate BH processing */
+	tty_flip_buffer_push(tport);
+
+	return;
+
+	/* Error processing */
+
+      handle_error:
+	/* Statistics */
+	if (status & BD_SC_BR)
+		port->icount.brk++;
+	if (status & BD_SC_PR)
+		port->icount.parity++;
+	if (status & BD_SC_FR)
+		port->icount.frame++;
+	if (status & BD_SC_OV)
+		port->icount.overrun++;
+
+	/* Mask out ignored conditions */
+	status &= port->read_status_mask;
+
+	/* Handle the remaining ones */
+	if (status & BD_SC_BR)
+		flg = TTY_BREAK;
+	else if (status & BD_SC_PR)
+		flg = TTY_PARITY;
+	else if (status & BD_SC_FR)
+		flg = TTY_FRAME;
+
+	/* overrun does not affect the current character ! */
+	if (status & BD_SC_OV) {
+		ch = 0;
+		flg = TTY_OVERRUN;
+		/* We skip this buffer */
+		/* CHECK: Is really nothing senseful there */
+		/* ASSUMPTION: it contains nothing valid */
+		i = 0;
+	}
+	port->sysrq = 0;
+	goto error_return;
+}
+
+/*
+ * Asynchron mode interrupt handler
+ */
+static irqreturn_t cpm_uart_int(int irq, void *data)
+{
+	u8 events;
+	struct uart_port *port = data;
+	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+	smc_t __iomem *smcp = pinfo->smcp;
+	scc_t __iomem *sccp = pinfo->sccp;
+
+	pr_debug("CPM uart[%d]:IRQ\n", port->line);
+
+	if (IS_SMC(pinfo)) {
+		events = in_8(&smcp->smc_smce);
+		out_8(&smcp->smc_smce, events);
+		if (events & SMCM_BRKE)
+			uart_handle_break(port);
+		if (events & SMCM_RX)
+			cpm_uart_int_rx(port);
+		if (events & SMCM_TX)
+			cpm_uart_int_tx(port);
+	} else {
+		events = in_be16(&sccp->scc_scce);
+		out_be16(&sccp->scc_scce, events);
+		if (events & UART_SCCM_BRKE)
+			uart_handle_break(port);
+		if (events & UART_SCCM_RX)
+			cpm_uart_int_rx(port);
+		if (events & UART_SCCM_TX)
+			cpm_uart_int_tx(port);
+	}
+	return (events) ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static int cpm_uart_startup(struct uart_port *port)
+{
+	int retval;
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+
+	pr_debug("CPM uart[%d]:startup\n", port->line);
+
+	/* If the port is not the console, make sure rx is disabled. */
+	if (!(pinfo->flags & FLAG_CONSOLE)) {
+		/* Disable UART rx */
+		if (IS_SMC(pinfo)) {
+			clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN);
+			clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
+		} else {
+			clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR);
+			clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
+		}
+		cpm_uart_initbd(pinfo);
+		if (IS_SMC(pinfo)) {
+			out_be32(&pinfo->smcup->smc_rstate, 0);
+			out_be32(&pinfo->smcup->smc_tstate, 0);
+			out_be16(&pinfo->smcup->smc_rbptr,
+				 in_be16(&pinfo->smcup->smc_rbase));
+			out_be16(&pinfo->smcup->smc_tbptr,
+				 in_be16(&pinfo->smcup->smc_tbase));
+		} else {
+			cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
+		}
+	}
+	/* Install interrupt handler. */
+	retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port);
+	if (retval)
+		return retval;
+
+	/* Startup rx-int */
+	if (IS_SMC(pinfo)) {
+		setbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
+		setbits16(&pinfo->smcp->smc_smcmr, (SMCMR_REN | SMCMR_TEN));
+	} else {
+		setbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
+		setbits32(&pinfo->sccp->scc_gsmrl, (SCC_GSMRL_ENR | SCC_GSMRL_ENT));
+	}
+
+	return 0;
+}
+
+inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo)
+{
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	schedule_timeout(pinfo->wait_closing);
+}
+
+/*
+ * Shutdown the uart
+ */
+static void cpm_uart_shutdown(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+
+	pr_debug("CPM uart[%d]:shutdown\n", port->line);
+
+	/* free interrupt handler */
+	free_irq(port->irq, port);
+
+	/* If the port is not the console, disable Rx and Tx. */
+	if (!(pinfo->flags & FLAG_CONSOLE)) {
+		/* Wait for all the BDs marked sent */
+		while(!cpm_uart_tx_empty(port)) {
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			schedule_timeout(2);
+		}
+
+		if (pinfo->wait_closing)
+			cpm_uart_wait_until_send(pinfo);
+
+		/* Stop uarts */
+		if (IS_SMC(pinfo)) {
+			smc_t __iomem *smcp = pinfo->smcp;
+			clrbits16(&smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+			clrbits8(&smcp->smc_smcm, SMCM_RX | SMCM_TX);
+		} else {
+			scc_t __iomem *sccp = pinfo->sccp;
+			clrbits32(&sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+			clrbits16(&sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
+		}
+
+		/* Shut them really down and reinit buffer descriptors */
+		if (IS_SMC(pinfo)) {
+			out_be16(&pinfo->smcup->smc_brkcr, 0);
+			cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
+		} else {
+			out_be16(&pinfo->sccup->scc_brkcr, 0);
+			cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
+		}
+
+		cpm_uart_initbd(pinfo);
+	}
+}
+
+static void cpm_uart_set_termios(struct uart_port *port,
+                                 struct ktermios *termios,
+                                 const struct ktermios *old)
+{
+	int baud;
+	unsigned long flags;
+	u16 cval, scval, prev_mode;
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	smc_t __iomem *smcp = pinfo->smcp;
+	scc_t __iomem *sccp = pinfo->sccp;
+	int maxidl;
+
+	pr_debug("CPM uart[%d]:set_termios\n", port->line);
+
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+	if (baud < HW_BUF_SPD_THRESHOLD || port->flags & UPF_LOW_LATENCY)
+		pinfo->rx_fifosize = 1;
+	else
+		pinfo->rx_fifosize = RX_BUF_SIZE;
+
+	/* MAXIDL is the timeout after which a receive buffer is closed
+	 * when not full if no more characters are received.
+	 * We calculate it from the baudrate so that the duration is
+	 * always the same at standard rates: about 4ms.
+	 */
+	maxidl = baud / 2400;
+	if (maxidl < 1)
+		maxidl = 1;
+	if (maxidl > 0x10)
+		maxidl = 0x10;
+
+	cval = 0;
+	scval = 0;
+
+	if (termios->c_cflag & CSTOPB) {
+		cval |= SMCMR_SL;	/* Two stops */
+		scval |= SCU_PSMR_SL;
+	}
+
+	if (termios->c_cflag & PARENB) {
+		cval |= SMCMR_PEN;
+		scval |= SCU_PSMR_PEN;
+		if (!(termios->c_cflag & PARODD)) {
+			cval |= SMCMR_PM_EVEN;
+			scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP);
+		}
+	}
+
+	/*
+	 * Update the timeout
+	 */
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	/*
+	 * Set up parity check flag
+	 */
+	port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
+	if (termios->c_iflag & INPCK)
+		port->read_status_mask |= BD_SC_FR | BD_SC_PR;
+	if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK))
+		port->read_status_mask |= BD_SC_BR;
+
+	/*
+	 * Characters to ignore
+	 */
+	port->ignore_status_mask = 0;
+	if (termios->c_iflag & IGNPAR)
+		port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
+	if (termios->c_iflag & IGNBRK) {
+		port->ignore_status_mask |= BD_SC_BR;
+		/*
+		 * If we're ignore parity and break indicators, ignore
+		 * overruns too.  (For real raw support).
+		 */
+		if (termios->c_iflag & IGNPAR)
+			port->ignore_status_mask |= BD_SC_OV;
+	}
+	/*
+	 * !!! ignore all characters if CREAD is not set
+	 */
+	if ((termios->c_cflag & CREAD) == 0)
+		port->read_status_mask &= ~BD_SC_EMPTY;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (IS_SMC(pinfo)) {
+		unsigned int bits = tty_get_frame_size(termios->c_cflag);
+
+		/*
+		 * MRBLR can be changed while an SMC/SCC is operating only
+		 * if it is done in a single bus cycle with one 16-bit move
+		 * (not two 8-bit bus cycles back-to-back). This occurs when
+		 * the cp shifts control to the next RxBD, so the change does
+		 * not take effect immediately. To guarantee the exact RxBD
+		 * on which the change occurs, change MRBLR only while the
+		 * SMC/SCC receiver is disabled.
+		 */
+		out_be16(&pinfo->smcup->smc_mrblr, pinfo->rx_fifosize);
+		out_be16(&pinfo->smcup->smc_maxidl, maxidl);
+
+		/* Set the mode register.  We want to keep a copy of the
+		 * enables, because we want to put them back if they were
+		 * present.
+		 */
+		prev_mode = in_be16(&smcp->smc_smcmr) & (SMCMR_REN | SMCMR_TEN);
+		/* Output in *one* operation, so we don't interrupt RX/TX if they
+		 * were already enabled.
+		 * Character length programmed into the register is frame bits minus 1.
+		 */
+		out_be16(&smcp->smc_smcmr, smcr_mk_clen(bits - 1) | cval |
+					   SMCMR_SM_UART | prev_mode);
+	} else {
+		unsigned int bits = tty_get_char_size(termios->c_cflag);
+
+		out_be16(&pinfo->sccup->scc_genscc.scc_mrblr, pinfo->rx_fifosize);
+		out_be16(&pinfo->sccup->scc_maxidl, maxidl);
+		out_be16(&sccp->scc_psmr, (UART_LCR_WLEN(bits) << 12) | scval);
+	}
+
+	if (pinfo->clk)
+		clk_set_rate(pinfo->clk, baud);
+	else
+		cpm_setbrg(pinfo->brg - 1, baud);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *cpm_uart_type(struct uart_port *port)
+{
+	pr_debug("CPM uart[%d]:uart_type\n", port->line);
+
+	return port->type == PORT_CPM ? "CPM UART" : NULL;
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int cpm_uart_verify_port(struct uart_port *port,
+				struct serial_struct *ser)
+{
+	int ret = 0;
+
+	pr_debug("CPM uart[%d]:verify_port\n", port->line);
+
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
+		ret = -EINVAL;
+	if (ser->irq < 0 || ser->irq >= nr_irqs)
+		ret = -EINVAL;
+	if (ser->baud_base < 9600)
+		ret = -EINVAL;
+	return ret;
+}
+
+/*
+ * Transmit characters, refill buffer descriptor, if possible
+ */
+static int cpm_uart_tx_pump(struct uart_port *port)
+{
+	cbd_t __iomem *bdp;
+	u8 *p;
+	int count;
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	struct circ_buf *xmit = &port->state->xmit;
+
+	/* Handle xon/xoff */
+	if (port->x_char) {
+		/* Pick next descriptor and fill from buffer */
+		bdp = pinfo->tx_cur;
+
+		p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
+
+		*p++ = port->x_char;
+
+		out_be16(&bdp->cbd_datlen, 1);
+		setbits16(&bdp->cbd_sc, BD_SC_READY);
+		/* Get next BD. */
+		if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+			bdp = pinfo->tx_bd_base;
+		else
+			bdp++;
+		pinfo->tx_cur = bdp;
+
+		port->icount.tx++;
+		port->x_char = 0;
+		return 1;
+	}
+
+	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+		cpm_uart_stop_tx(port);
+		return 0;
+	}
+
+	/* Pick next descriptor and fill from buffer */
+	bdp = pinfo->tx_cur;
+
+	while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) && !uart_circ_empty(xmit)) {
+		count = 0;
+		p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
+		while (count < pinfo->tx_fifosize) {
+			*p++ = xmit->buf[xmit->tail];
+			uart_xmit_advance(port, 1);
+			count++;
+			if (uart_circ_empty(xmit))
+				break;
+		}
+		out_be16(&bdp->cbd_datlen, count);
+		setbits16(&bdp->cbd_sc, BD_SC_READY);
+		/* Get next BD. */
+		if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+			bdp = pinfo->tx_bd_base;
+		else
+			bdp++;
+	}
+	pinfo->tx_cur = bdp;
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	if (uart_circ_empty(xmit)) {
+		cpm_uart_stop_tx(port);
+		return 0;
+	}
+
+	return 1;
+}
+
+/*
+ * init buffer descriptors
+ */
+static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
+{
+	int i;
+	u8 *mem_addr;
+	cbd_t __iomem *bdp;
+
+	pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
+
+	/* Set the physical address of the host memory
+	 * buffers in the buffer descriptors, and the
+	 * virtual address for us to work with.
+	 */
+	mem_addr = pinfo->mem_addr;
+	bdp = pinfo->rx_cur = pinfo->rx_bd_base;
+	for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
+		out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
+		out_be16(&bdp->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT);
+		mem_addr += pinfo->rx_fifosize;
+	}
+
+	out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
+	out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT);
+
+	/* Set the physical address of the host memory
+	 * buffers in the buffer descriptors, and the
+	 * virtual address for us to work with.
+	 */
+	mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
+	bdp = pinfo->tx_cur = pinfo->tx_bd_base;
+	for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
+		out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
+		out_be16(&bdp->cbd_sc, BD_SC_INTRPT);
+		mem_addr += pinfo->tx_fifosize;
+	}
+
+	out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
+	out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_INTRPT);
+}
+
+static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
+{
+	scc_t __iomem *scp;
+	scc_uart_t __iomem *sup;
+
+	pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line);
+
+	scp = pinfo->sccp;
+	sup = pinfo->sccup;
+
+	/* Store address */
+	out_be16(&pinfo->sccup->scc_genscc.scc_rbase,
+	         (u8 __iomem *)pinfo->rx_bd_base - DPRAM_BASE);
+	out_be16(&pinfo->sccup->scc_genscc.scc_tbase,
+	         (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE);
+
+	/* Set up the uart parameters in the
+	 * parameter ram.
+	 */
+
+	out_8(&sup->scc_genscc.scc_rfcr, CPMFCR_GBL | CPMFCR_EB);
+	out_8(&sup->scc_genscc.scc_tfcr, CPMFCR_GBL | CPMFCR_EB);
+
+	out_be16(&sup->scc_genscc.scc_mrblr, pinfo->rx_fifosize);
+	out_be16(&sup->scc_maxidl, 0x10);
+	out_be16(&sup->scc_brkcr, 1);
+	out_be16(&sup->scc_parec, 0);
+	out_be16(&sup->scc_frmec, 0);
+	out_be16(&sup->scc_nosec, 0);
+	out_be16(&sup->scc_brkec, 0);
+	out_be16(&sup->scc_uaddr1, 0);
+	out_be16(&sup->scc_uaddr2, 0);
+	out_be16(&sup->scc_toseq, 0);
+	out_be16(&sup->scc_char1, 0x8000);
+	out_be16(&sup->scc_char2, 0x8000);
+	out_be16(&sup->scc_char3, 0x8000);
+	out_be16(&sup->scc_char4, 0x8000);
+	out_be16(&sup->scc_char5, 0x8000);
+	out_be16(&sup->scc_char6, 0x8000);
+	out_be16(&sup->scc_char7, 0x8000);
+	out_be16(&sup->scc_char8, 0x8000);
+	out_be16(&sup->scc_rccm, 0xc0ff);
+
+	/* Send the CPM an initialize command.
+	 */
+	cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
+
+	/* Set UART mode, 8 bit, no parity, one stop.
+	 * Enable receive and transmit.
+	 */
+	out_be32(&scp->scc_gsmrh, 0);
+	out_be32(&scp->scc_gsmrl,
+	         SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
+
+	/* Enable rx interrupts  and clear all pending events.  */
+	out_be16(&scp->scc_sccm, 0);
+	out_be16(&scp->scc_scce, 0xffff);
+	out_be16(&scp->scc_dsr, 0x7e7e);
+	out_be16(&scp->scc_psmr, 0x3000);
+
+	setbits32(&scp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+}
+
+static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
+{
+	smc_t __iomem *sp;
+	smc_uart_t __iomem *up;
+
+	pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line);
+
+	sp = pinfo->smcp;
+	up = pinfo->smcup;
+
+	/* Store address */
+	out_be16(&pinfo->smcup->smc_rbase,
+	         (u8 __iomem *)pinfo->rx_bd_base - DPRAM_BASE);
+	out_be16(&pinfo->smcup->smc_tbase,
+	         (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE);
+
+/*
+ *  In case SMC is being relocated...
+ */
+	out_be16(&up->smc_rbptr, in_be16(&pinfo->smcup->smc_rbase));
+	out_be16(&up->smc_tbptr, in_be16(&pinfo->smcup->smc_tbase));
+	out_be32(&up->smc_rstate, 0);
+	out_be32(&up->smc_tstate, 0);
+	out_be16(&up->smc_brkcr, 1);              /* number of break chars */
+	out_be16(&up->smc_brkec, 0);
+
+	/* Set up the uart parameters in the
+	 * parameter ram.
+	 */
+	out_8(&up->smc_rfcr, CPMFCR_GBL | CPMFCR_EB);
+	out_8(&up->smc_tfcr, CPMFCR_GBL | CPMFCR_EB);
+
+	/* Using idle character time requires some additional tuning.  */
+	out_be16(&up->smc_mrblr, pinfo->rx_fifosize);
+	out_be16(&up->smc_maxidl, 0x10);
+	out_be16(&up->smc_brklen, 0);
+	out_be16(&up->smc_brkec, 0);
+	out_be16(&up->smc_brkcr, 1);
+
+	/* Set UART mode, 8 bit, no parity, one stop.
+	 * Enable receive and transmit.
+	 */
+	out_be16(&sp->smc_smcmr, smcr_mk_clen(9) | SMCMR_SM_UART);
+
+	/* Enable only rx interrupts clear all pending events. */
+	out_8(&sp->smc_smcm, 0);
+	out_8(&sp->smc_smce, 0xff);
+
+	setbits16(&sp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+}
+
+/*
+ * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
+ * receive buffer descriptors from dual port ram, and a character
+ * buffer area from host mem. If we are allocating for the console we need
+ * to do it from bootmem
+ */
+static int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
+{
+	int dpmemsz, memsz;
+	u8 __iomem *dp_mem;
+	unsigned long dp_offset;
+	u8 *mem_addr;
+	dma_addr_t dma_addr = 0;
+
+	pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
+
+	dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
+	dp_offset = cpm_muram_alloc(dpmemsz, 8);
+	if (IS_ERR_VALUE(dp_offset)) {
+		pr_err("%s: could not allocate buffer descriptors\n", __func__);
+		return -ENOMEM;
+	}
+
+	dp_mem = cpm_muram_addr(dp_offset);
+
+	memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
+	    L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
+	if (IS_ENABLED(CONFIG_CPM1) && is_con) {
+		/* was hostalloc but changed cause it blows away the */
+		/* large tlb mapping when pinning the kernel area    */
+		mem_addr = (u8 __force *)cpm_muram_addr(cpm_muram_alloc(memsz, 8));
+		dma_addr = cpm_muram_dma((void __iomem *)mem_addr);
+	} else if (is_con) {
+		mem_addr = kzalloc(memsz, GFP_NOWAIT);
+		dma_addr = virt_to_bus(mem_addr);
+	} else {
+		mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
+					      GFP_KERNEL);
+	}
+
+	if (!mem_addr) {
+		cpm_muram_free(dp_offset);
+		pr_err("%s: could not allocate coherent memory\n", __func__);
+		return -ENOMEM;
+	}
+
+	pinfo->dp_addr = dp_offset;
+	pinfo->mem_addr = mem_addr;
+	pinfo->dma_addr = dma_addr;
+	pinfo->mem_size = memsz;
+
+	pinfo->rx_buf = mem_addr;
+	pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
+						       * pinfo->rx_fifosize);
+
+	pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
+	pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
+
+	return 0;
+}
+
+static void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
+{
+	dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
+							  pinfo->rx_fifosize) +
+			  L1_CACHE_ALIGN(pinfo->tx_nrfifos *
+					 pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
+			  pinfo->dma_addr);
+
+	cpm_muram_free(pinfo->dp_addr);
+}
+
+/*
+ * Initialize port. This is called from early_console stuff
+ * so we have to be careful here !
+ */
+static int cpm_uart_request_port(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	int ret;
+
+	pr_debug("CPM uart[%d]:request port\n", port->line);
+
+	if (pinfo->flags & FLAG_CONSOLE)
+		return 0;
+
+	if (IS_SMC(pinfo)) {
+		clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
+		clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+	} else {
+		clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
+		clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+	}
+
+	ret = cpm_uart_allocbuf(pinfo, 0);
+
+	if (ret)
+		return ret;
+
+	cpm_uart_initbd(pinfo);
+	if (IS_SMC(pinfo))
+		cpm_uart_init_smc(pinfo);
+	else
+		cpm_uart_init_scc(pinfo);
+
+	return 0;
+}
+
+static void cpm_uart_release_port(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+
+	if (!(pinfo->flags & FLAG_CONSOLE))
+		cpm_uart_freebuf(pinfo);
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void cpm_uart_config_port(struct uart_port *port, int flags)
+{
+	pr_debug("CPM uart[%d]:config_port\n", port->line);
+
+	if (flags & UART_CONFIG_TYPE) {
+		port->type = PORT_CPM;
+		cpm_uart_request_port(port);
+	}
+}
+
+#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_CPM_CONSOLE)
+/*
+ * Write a string to the serial port
+ * Note that this is called with interrupts already disabled
+ */
+static void cpm_uart_early_write(struct uart_cpm_port *pinfo,
+		const char *string, u_int count, bool handle_linefeed)
+{
+	unsigned int i;
+	cbd_t __iomem *bdp, *bdbase;
+	unsigned char *cpm_outp_addr;
+
+	/* Get the address of the host memory buffer.
+	 */
+	bdp = pinfo->tx_cur;
+	bdbase = pinfo->tx_bd_base;
+
+	/*
+	 * Now, do each character.  This is not as bad as it looks
+	 * since this is a holding FIFO and not a transmitting FIFO.
+	 * We could add the complexity of filling the entire transmit
+	 * buffer, but we would just wait longer between accesses......
+	 */
+	for (i = 0; i < count; i++, string++) {
+		/* Wait for transmitter fifo to empty.
+		 * Ready indicates output is ready, and xmt is doing
+		 * that, not that it is ready for us to send.
+		 */
+		while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
+			;
+
+		/* Send the character out.
+		 * If the buffer address is in the CPM DPRAM, don't
+		 * convert it.
+		 */
+		cpm_outp_addr = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr),
+					pinfo);
+		*cpm_outp_addr = *string;
+
+		out_be16(&bdp->cbd_datlen, 1);
+		setbits16(&bdp->cbd_sc, BD_SC_READY);
+
+		if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+			bdp = bdbase;
+		else
+			bdp++;
+
+		/* if a LF, also do CR... */
+		if (handle_linefeed && *string == 10) {
+			while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
+				;
+
+			cpm_outp_addr = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr),
+						pinfo);
+			*cpm_outp_addr = 13;
+
+			out_be16(&bdp->cbd_datlen, 1);
+			setbits16(&bdp->cbd_sc, BD_SC_READY);
+
+			if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+				bdp = bdbase;
+			else
+				bdp++;
+		}
+	}
+
+	/*
+	 * Finally, Wait for transmitter & holding register to empty
+	 *  and restore the IER
+	 */
+	while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
+		;
+
+	pinfo->tx_cur = bdp;
+}
+#endif
+
+#ifdef CONFIG_CONSOLE_POLL
+/* Serial polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+#define GDB_BUF_SIZE	512	/* power of 2, please */
+
+static char poll_buf[GDB_BUF_SIZE];
+static char *pollp;
+static int poll_chars;
+
+static int poll_wait_key(char *obuf, struct uart_cpm_port *pinfo)
+{
+	u_char		c, *cp;
+	volatile cbd_t	*bdp;
+	int		i;
+
+	/* Get the address of the host memory buffer.
+	 */
+	bdp = pinfo->rx_cur;
+	if (bdp->cbd_sc & BD_SC_EMPTY)
+		return NO_POLL_CHAR;
+
+	/* If the buffer address is in the CPM DPRAM, don't
+	 * convert it.
+	 */
+	cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
+
+	if (obuf) {
+		i = c = bdp->cbd_datlen;
+		while (i-- > 0)
+			*obuf++ = *cp++;
+	} else
+		c = *cp;
+	bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
+	bdp->cbd_sc |= BD_SC_EMPTY;
+
+	if (bdp->cbd_sc & BD_SC_WRAP)
+		bdp = pinfo->rx_bd_base;
+	else
+		bdp++;
+	pinfo->rx_cur = (cbd_t *)bdp;
+
+	return (int)c;
+}
+
+static int cpm_get_poll_char(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+
+	if (!serial_polled) {
+		serial_polled = 1;
+		poll_chars = 0;
+	}
+	if (poll_chars <= 0) {
+		int ret = poll_wait_key(poll_buf, pinfo);
+
+		if (ret == NO_POLL_CHAR)
+			return ret;
+		poll_chars = ret;
+		pollp = poll_buf;
+	}
+	poll_chars--;
+	return *pollp++;
+}
+
+static void cpm_put_poll_char(struct uart_port *port,
+			 unsigned char c)
+{
+	struct uart_cpm_port *pinfo =
+		container_of(port, struct uart_cpm_port, port);
+	static char ch[2];
+
+	ch[0] = (char)c;
+	cpm_uart_early_write(pinfo, ch, 1, false);
+}
+
+#ifdef CONFIG_SERIAL_CPM_CONSOLE
+static struct uart_port *udbg_port;
+
+static void udbg_cpm_putc(char c)
+{
+	if (c == '\n')
+		cpm_put_poll_char(udbg_port, '\r');
+	cpm_put_poll_char(udbg_port, c);
+}
+
+static int udbg_cpm_getc_poll(void)
+{
+	int c = cpm_get_poll_char(udbg_port);
+
+	return c == NO_POLL_CHAR ? -1 : c;
+}
+
+static int udbg_cpm_getc(void)
+{
+	int c;
+
+	while ((c = udbg_cpm_getc_poll()) == -1)
+		cpu_relax();
+	return c;
+}
+#endif /* CONFIG_SERIAL_CPM_CONSOLE */
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+static const struct uart_ops cpm_uart_pops = {
+	.tx_empty	= cpm_uart_tx_empty,
+	.set_mctrl	= cpm_uart_set_mctrl,
+	.get_mctrl	= cpm_uart_get_mctrl,
+	.stop_tx	= cpm_uart_stop_tx,
+	.start_tx	= cpm_uart_start_tx,
+	.stop_rx	= cpm_uart_stop_rx,
+	.break_ctl	= cpm_uart_break_ctl,
+	.startup	= cpm_uart_startup,
+	.shutdown	= cpm_uart_shutdown,
+	.set_termios	= cpm_uart_set_termios,
+	.type		= cpm_uart_type,
+	.release_port	= cpm_uart_release_port,
+	.request_port	= cpm_uart_request_port,
+	.config_port	= cpm_uart_config_port,
+	.verify_port	= cpm_uart_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char = cpm_get_poll_char,
+	.poll_put_char = cpm_put_poll_char,
+#endif
+};
+
+static struct uart_cpm_port cpm_uart_ports[UART_NR];
+
+static void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
+				       struct device_node *np)
+{
+	void __iomem *pram;
+	unsigned long offset;
+	struct resource res;
+	resource_size_t len;
+
+	/* Don't remap parameter RAM if it has already been initialized
+	 * during console setup.
+	 */
+	if (IS_SMC(port) && port->smcup)
+		return port->smcup;
+	else if (!IS_SMC(port) && port->sccup)
+		return port->sccup;
+
+	if (of_address_to_resource(np, 1, &res))
+		return NULL;
+
+	len = resource_size(&res);
+	pram = ioremap(res.start, len);
+	if (!pram)
+		return NULL;
+
+	if (!IS_ENABLED(CONFIG_CPM2) || !IS_SMC(port))
+		return pram;
+
+	if (len != 2) {
+		pr_warn("cpm_uart[%d]: device tree references "
+			"SMC pram, using boot loader/wrapper pram mapping. "
+			"Please fix your device tree to reference the pram "
+			"base register instead.\n",
+			port->port.line);
+		return pram;
+	}
+
+	offset = cpm_muram_alloc(64, 64);
+	out_be16(pram, offset);
+	iounmap(pram);
+	return cpm_muram_addr(offset);
+}
+
+static void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
+{
+	if (!IS_ENABLED(CONFIG_CPM2) || !IS_SMC(port))
+		iounmap(pram);
+}
+
+static int cpm_uart_init_port(struct device_node *np,
+                              struct uart_cpm_port *pinfo)
+{
+	const u32 *data;
+	void __iomem *mem, *pram;
+	struct device *dev = pinfo->port.dev;
+	int len;
+	int ret;
+	int i;
+
+	data = of_get_property(np, "clock", NULL);
+	if (data) {
+		struct clk *clk = clk_get(NULL, (const char*)data);
+		if (!IS_ERR(clk))
+			pinfo->clk = clk;
+	}
+	if (!pinfo->clk) {
+		data = of_get_property(np, "fsl,cpm-brg", &len);
+		if (!data || len != 4) {
+			printk(KERN_ERR "CPM UART %pOFn has no/invalid "
+			                "fsl,cpm-brg property.\n", np);
+			return -EINVAL;
+		}
+		pinfo->brg = *data;
+	}
+
+	data = of_get_property(np, "fsl,cpm-command", &len);
+	if (!data || len != 4) {
+		printk(KERN_ERR "CPM UART %pOFn has no/invalid "
+		                "fsl,cpm-command property.\n", np);
+		return -EINVAL;
+	}
+	pinfo->command = *data;
+
+	mem = of_iomap(np, 0);
+	if (!mem)
+		return -ENOMEM;
+
+	if (of_device_is_compatible(np, "fsl,cpm1-scc-uart") ||
+	    of_device_is_compatible(np, "fsl,cpm2-scc-uart")) {
+		pinfo->sccp = mem;
+		pinfo->sccup = pram = cpm_uart_map_pram(pinfo, np);
+	} else if (of_device_is_compatible(np, "fsl,cpm1-smc-uart") ||
+	           of_device_is_compatible(np, "fsl,cpm2-smc-uart")) {
+		pinfo->flags |= FLAG_SMC;
+		pinfo->smcp = mem;
+		pinfo->smcup = pram = cpm_uart_map_pram(pinfo, np);
+	} else {
+		ret = -ENODEV;
+		goto out_mem;
+	}
+
+	if (!pram) {
+		ret = -ENOMEM;
+		goto out_mem;
+	}
+
+	pinfo->tx_nrfifos = TX_NUM_FIFO;
+	pinfo->tx_fifosize = TX_BUF_SIZE;
+	pinfo->rx_nrfifos = RX_NUM_FIFO;
+	pinfo->rx_fifosize = RX_BUF_SIZE;
+
+	pinfo->port.uartclk = ppc_proc_freq;
+	pinfo->port.mapbase = (unsigned long)mem;
+	pinfo->port.type = PORT_CPM;
+	pinfo->port.ops = &cpm_uart_pops;
+	pinfo->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_CPM_CONSOLE);
+	pinfo->port.iotype = UPIO_MEM;
+	pinfo->port.fifosize = pinfo->tx_nrfifos * pinfo->tx_fifosize;
+	spin_lock_init(&pinfo->port.lock);
+
+	for (i = 0; i < NUM_GPIOS; i++) {
+		struct gpio_desc *gpiod;
+
+		pinfo->gpios[i] = NULL;
+
+		gpiod = devm_gpiod_get_index_optional(dev, NULL, i, GPIOD_ASIS);
+
+		if (IS_ERR(gpiod)) {
+			ret = PTR_ERR(gpiod);
+			goto out_pram;
+		}
+
+		if (gpiod) {
+			if (i == GPIO_RTS || i == GPIO_DTR)
+				ret = gpiod_direction_output(gpiod, 0);
+			else
+				ret = gpiod_direction_input(gpiod);
+			if (ret) {
+				pr_err("can't set direction for gpio #%d: %d\n",
+					i, ret);
+				continue;
+			}
+			pinfo->gpios[i] = gpiod;
+		}
+	}
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
+#if defined(CONFIG_CONSOLE_POLL) && defined(CONFIG_SERIAL_CPM_CONSOLE)
+	if (!udbg_port)
+#endif
+		udbg_putc = NULL;
+#endif
+
+	return cpm_uart_request_port(&pinfo->port);
+
+out_pram:
+	cpm_uart_unmap_pram(pinfo, pram);
+out_mem:
+	iounmap(mem);
+	return ret;
+}
+
+#ifdef CONFIG_SERIAL_CPM_CONSOLE
+/*
+ *	Print a string to the serial port trying not to disturb
+ *	any possible real use of the port...
+ *
+ *	Note that this is called with interrupts already disabled
+ */
+static void cpm_uart_console_write(struct console *co, const char *s,
+				   u_int count)
+{
+	struct uart_cpm_port *pinfo = &cpm_uart_ports[co->index];
+	unsigned long flags;
+
+	if (unlikely(oops_in_progress)) {
+		local_irq_save(flags);
+		cpm_uart_early_write(pinfo, s, count, true);
+		local_irq_restore(flags);
+	} else {
+		spin_lock_irqsave(&pinfo->port.lock, flags);
+		cpm_uart_early_write(pinfo, s, count, true);
+		spin_unlock_irqrestore(&pinfo->port.lock, flags);
+	}
+}
+
+
+static int __init cpm_uart_console_setup(struct console *co, char *options)
+{
+	int baud = 38400;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+	int ret;
+	struct uart_cpm_port *pinfo;
+	struct uart_port *port;
+
+	struct device_node *np;
+	int i = 0;
+
+	if (co->index >= UART_NR) {
+		printk(KERN_ERR "cpm_uart: console index %d too high\n",
+		       co->index);
+		return -ENODEV;
+	}
+
+	for_each_node_by_type(np, "serial") {
+		if (!of_device_is_compatible(np, "fsl,cpm1-smc-uart") &&
+		    !of_device_is_compatible(np, "fsl,cpm1-scc-uart") &&
+		    !of_device_is_compatible(np, "fsl,cpm2-smc-uart") &&
+		    !of_device_is_compatible(np, "fsl,cpm2-scc-uart"))
+			continue;
+
+		if (i++ == co->index)
+			break;
+	}
+
+	if (!np)
+		return -ENODEV;
+
+	pinfo = &cpm_uart_ports[co->index];
+
+	pinfo->flags |= FLAG_CONSOLE;
+	port = &pinfo->port;
+
+	ret = cpm_uart_init_port(np, pinfo);
+	of_node_put(np);
+	if (ret)
+		return ret;
+
+	if (options) {
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+	} else {
+		baud = get_baudrate();
+		if (baud == -1)
+			baud = 9600;
+	}
+
+	if (IS_SMC(pinfo)) {
+		out_be16(&pinfo->smcup->smc_brkcr, 0);
+		cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
+		clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
+		clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+	} else {
+		out_be16(&pinfo->sccup->scc_brkcr, 0);
+		cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
+		clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
+		clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+	}
+
+	ret = cpm_uart_allocbuf(pinfo, 1);
+
+	if (ret)
+		return ret;
+
+	cpm_uart_initbd(pinfo);
+
+	if (IS_SMC(pinfo))
+		cpm_uart_init_smc(pinfo);
+	else
+		cpm_uart_init_scc(pinfo);
+
+	uart_set_options(port, co, baud, parity, bits, flow);
+	cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
+
+#ifdef CONFIG_CONSOLE_POLL
+	if (!udbg_port) {
+		udbg_port = &pinfo->port;
+		udbg_putc = udbg_cpm_putc;
+		udbg_getc = udbg_cpm_getc;
+		udbg_getc_poll = udbg_cpm_getc_poll;
+	}
+#endif
+
+	return 0;
+}
+
+static struct uart_driver cpm_reg;
+static struct console cpm_scc_uart_console = {
+	.name		= "ttyCPM",
+	.write		= cpm_uart_console_write,
+	.device		= uart_console_device,
+	.setup		= cpm_uart_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+	.data		= &cpm_reg,
+};
+
+static int __init cpm_uart_console_init(void)
+{
+	cpm_muram_init();
+	register_console(&cpm_scc_uart_console);
+	return 0;
+}
+
+console_initcall(cpm_uart_console_init);
+
+#define CPM_UART_CONSOLE	&cpm_scc_uart_console
+#else
+#define CPM_UART_CONSOLE	NULL
+#endif
+
+static struct uart_driver cpm_reg = {
+	.owner		= THIS_MODULE,
+	.driver_name	= "ttyCPM",
+	.dev_name	= "ttyCPM",
+	.major		= SERIAL_CPM_MAJOR,
+	.minor		= SERIAL_CPM_MINOR,
+	.cons		= CPM_UART_CONSOLE,
+	.nr		= UART_NR,
+};
+
+static int probe_index;
+
+static int cpm_uart_probe(struct platform_device *ofdev)
+{
+	int index = probe_index++;
+	struct uart_cpm_port *pinfo = &cpm_uart_ports[index];
+	int ret;
+
+	pinfo->port.line = index;
+
+	if (index >= UART_NR)
+		return -ENODEV;
+
+	platform_set_drvdata(ofdev, pinfo);
+
+	/* initialize the device pointer for the port */
+	pinfo->port.dev = &ofdev->dev;
+
+	pinfo->port.irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
+	if (!pinfo->port.irq)
+		return -EINVAL;
+
+	ret = cpm_uart_init_port(ofdev->dev.of_node, pinfo);
+	if (!ret)
+		return uart_add_one_port(&cpm_reg, &pinfo->port);
+
+	irq_dispose_mapping(pinfo->port.irq);
+
+	return ret;
+}
+
+static int cpm_uart_remove(struct platform_device *ofdev)
+{
+	struct uart_cpm_port *pinfo = platform_get_drvdata(ofdev);
+
+	uart_remove_one_port(&cpm_reg, &pinfo->port);
+
+	return 0;
+}
+
+static const struct of_device_id cpm_uart_match[] = {
+	{
+		.compatible = "fsl,cpm1-smc-uart",
+	},
+	{
+		.compatible = "fsl,cpm1-scc-uart",
+	},
+	{
+		.compatible = "fsl,cpm2-smc-uart",
+	},
+	{
+		.compatible = "fsl,cpm2-scc-uart",
+	},
+	{}
+};
+MODULE_DEVICE_TABLE(of, cpm_uart_match);
+
+static struct platform_driver cpm_uart_driver = {
+	.driver = {
+		.name = "cpm_uart",
+		.of_match_table = cpm_uart_match,
+	},
+	.probe = cpm_uart_probe,
+	.remove = cpm_uart_remove,
+ };
+
+static int __init cpm_uart_init(void)
+{
+	int ret = uart_register_driver(&cpm_reg);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&cpm_uart_driver);
+	if (ret)
+		uart_unregister_driver(&cpm_reg);
+
+	return ret;
+}
+
+static void __exit cpm_uart_exit(void)
+{
+	platform_driver_unregister(&cpm_uart_driver);
+	uart_unregister_driver(&cpm_reg);
+}
+
+module_init(cpm_uart_init);
+module_exit(cpm_uart_exit);
+
+MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis");
+MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR);