Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 1922 insertions, 0 deletions

diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
new file mode 100644
index 0000000000..916507b8f3
--- /dev/null
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -0,0 +1,1922 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
+ *
+ * FIXME According to the usermanual the status bits in the status register
+ * are only updated when the peripherals access the FIFO and not when the
+ * CPU access them. So since we use this bits to know when we stop writing
+ * and reading, they may not be updated in-time and a race condition may
+ * exists. But I haven't be able to prove this and I don't care. But if
+ * any problem arises, it might worth checking. The TX/RX FIFO Stats
+ * registers should be used in addition.
+ * Update: Actually, they seem updated ... At least the bits we use.
+ *
+ *
+ * Maintainer : Sylvain Munaut <tnt@246tNt.com>
+ *
+ * Some of the code has been inspired/copied from the 2.4 code written
+ * by Dale Farnsworth <dfarnsworth@mvista.com>.
+ *
+ * Copyright (C) 2008 Freescale Semiconductor Inc.
+ *                    John Rigby <jrigby@gmail.com>
+ * Added support for MPC5121
+ * Copyright (C) 2006 Secret Lab Technologies Ltd.
+ *                    Grant Likely <grant.likely@secretlab.ca>
+ * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
+ * Copyright (C) 2003 MontaVista, Software, Inc.
+ */
+
+#undef DEBUG
+
+#include <linux/device.h>
+#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/delay.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+#include <asm/mpc52xx.h>
+#include <asm/mpc52xx_psc.h>
+
+#include <linux/serial_core.h>
+
+
+/* We've been assigned a range on the "Low-density serial ports" major */
+#define SERIAL_PSC_MAJOR	204
+#define SERIAL_PSC_MINOR	148
+
+
+#define ISR_PASS_LIMIT 256	/* Max number of iteration in the interrupt */
+
+
+static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
+	/* Rem: - We use the read_status_mask as a shadow of
+	 *        psc->mpc52xx_psc_imr
+	 *      - It's important that is array is all zero on start as we
+	 *        use it to know if it's initialized or not ! If it's not sure
+	 *        it's cleared, then a memset(...,0,...) should be added to
+	 *        the console_init
+	 */
+
+/* lookup table for matching device nodes to index numbers */
+static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
+
+static void mpc52xx_uart_of_enumerate(void);
+
+
+#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
+
+
+/* Forward declaration of the interruption handling routine */
+static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
+static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
+
+/* ======================================================================== */
+/* PSC fifo operations for isolating differences between 52xx and 512x      */
+/* ======================================================================== */
+
+struct psc_ops {
+	void		(*fifo_init)(struct uart_port *port);
+	unsigned int	(*raw_rx_rdy)(struct uart_port *port);
+	unsigned int	(*raw_tx_rdy)(struct uart_port *port);
+	unsigned int	(*rx_rdy)(struct uart_port *port);
+	unsigned int	(*tx_rdy)(struct uart_port *port);
+	unsigned int	(*tx_empty)(struct uart_port *port);
+	void		(*stop_rx)(struct uart_port *port);
+	void		(*start_tx)(struct uart_port *port);
+	void		(*stop_tx)(struct uart_port *port);
+	void		(*rx_clr_irq)(struct uart_port *port);
+	void		(*tx_clr_irq)(struct uart_port *port);
+	void		(*write_char)(struct uart_port *port, unsigned char c);
+	unsigned char	(*read_char)(struct uart_port *port);
+	void		(*cw_disable_ints)(struct uart_port *port);
+	void		(*cw_restore_ints)(struct uart_port *port);
+	unsigned int	(*set_baudrate)(struct uart_port *port,
+					struct ktermios *new,
+					const struct ktermios *old);
+	int		(*clock_alloc)(struct uart_port *port);
+	void		(*clock_relse)(struct uart_port *port);
+	int		(*clock)(struct uart_port *port, int enable);
+	int		(*fifoc_init)(void);
+	void		(*fifoc_uninit)(void);
+	void		(*get_irq)(struct uart_port *, struct device_node *);
+	irqreturn_t	(*handle_irq)(struct uart_port *port);
+	u16		(*get_status)(struct uart_port *port);
+	u8		(*get_ipcr)(struct uart_port *port);
+	void		(*command)(struct uart_port *port, u8 cmd);
+	void		(*set_mode)(struct uart_port *port, u8 mr1, u8 mr2);
+	void		(*set_rts)(struct uart_port *port, int state);
+	void		(*enable_ms)(struct uart_port *port);
+	void		(*set_sicr)(struct uart_port *port, u32 val);
+	void		(*set_imr)(struct uart_port *port, u16 val);
+	u8		(*get_mr1)(struct uart_port *port);
+};
+
+/* setting the prescaler and divisor reg is common for all chips */
+static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
+				       u16 prescaler, unsigned int divisor)
+{
+	/* select prescaler */
+	out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
+	out_8(&psc->ctur, divisor >> 8);
+	out_8(&psc->ctlr, divisor & 0xff);
+}
+
+static u16 mpc52xx_psc_get_status(struct uart_port *port)
+{
+	return in_be16(&PSC(port)->mpc52xx_psc_status);
+}
+
+static u8 mpc52xx_psc_get_ipcr(struct uart_port *port)
+{
+	return in_8(&PSC(port)->mpc52xx_psc_ipcr);
+}
+
+static void mpc52xx_psc_command(struct uart_port *port, u8 cmd)
+{
+	out_8(&PSC(port)->command, cmd);
+}
+
+static void mpc52xx_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
+{
+	out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
+	out_8(&PSC(port)->mode, mr1);
+	out_8(&PSC(port)->mode, mr2);
+}
+
+static void mpc52xx_psc_set_rts(struct uart_port *port, int state)
+{
+	if (state)
+		out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
+	else
+		out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
+}
+
+static void mpc52xx_psc_enable_ms(struct uart_port *port)
+{
+	struct mpc52xx_psc __iomem *psc = PSC(port);
+
+	/* clear D_*-bits by reading them */
+	in_8(&psc->mpc52xx_psc_ipcr);
+	/* enable CTS and DCD as IPC interrupts */
+	out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
+
+	port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
+	out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void mpc52xx_psc_set_sicr(struct uart_port *port, u32 val)
+{
+	out_be32(&PSC(port)->sicr, val);
+}
+
+static void mpc52xx_psc_set_imr(struct uart_port *port, u16 val)
+{
+	out_be16(&PSC(port)->mpc52xx_psc_imr, val);
+}
+
+static u8 mpc52xx_psc_get_mr1(struct uart_port *port)
+{
+	out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
+	return in_8(&PSC(port)->mode);
+}
+
+#ifdef CONFIG_PPC_MPC52xx
+#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
+static void mpc52xx_psc_fifo_init(struct uart_port *port)
+{
+	struct mpc52xx_psc __iomem *psc = PSC(port);
+	struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
+
+	out_8(&fifo->rfcntl, 0x00);
+	out_be16(&fifo->rfalarm, 0x1ff);
+	out_8(&fifo->tfcntl, 0x07);
+	out_be16(&fifo->tfalarm, 0x80);
+
+	port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
+	out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static unsigned int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
+{
+	return in_be16(&PSC(port)->mpc52xx_psc_status)
+	    & MPC52xx_PSC_SR_RXRDY;
+}
+
+static unsigned int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
+{
+	return in_be16(&PSC(port)->mpc52xx_psc_status)
+	    & MPC52xx_PSC_SR_TXRDY;
+}
+
+
+static unsigned int mpc52xx_psc_rx_rdy(struct uart_port *port)
+{
+	return in_be16(&PSC(port)->mpc52xx_psc_isr)
+	    & port->read_status_mask
+	    & MPC52xx_PSC_IMR_RXRDY;
+}
+
+static unsigned int mpc52xx_psc_tx_rdy(struct uart_port *port)
+{
+	return in_be16(&PSC(port)->mpc52xx_psc_isr)
+	    & port->read_status_mask
+	    & MPC52xx_PSC_IMR_TXRDY;
+}
+
+static unsigned int mpc52xx_psc_tx_empty(struct uart_port *port)
+{
+	u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status);
+
+	return (sts & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;
+}
+
+static void mpc52xx_psc_start_tx(struct uart_port *port)
+{
+	port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
+	out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void mpc52xx_psc_stop_tx(struct uart_port *port)
+{
+	port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
+	out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void mpc52xx_psc_stop_rx(struct uart_port *port)
+{
+	port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
+	out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
+{
+}
+
+static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
+{
+}
+
+static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
+{
+	out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
+}
+
+static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
+{
+	return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
+}
+
+static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
+{
+	out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
+}
+
+static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
+{
+	out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
+					     struct ktermios *new,
+					     const struct ktermios *old)
+{
+	unsigned int baud;
+	unsigned int divisor;
+
+	/* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
+	baud = uart_get_baud_rate(port, new, old,
+				  port->uartclk / (32 * 0xffff) + 1,
+				  port->uartclk / 32);
+	divisor = (port->uartclk + 16 * baud) / (32 * baud);
+
+	/* enable the /32 prescaler and set the divisor */
+	mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
+	return baud;
+}
+
+static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
+					      struct ktermios *new,
+					      const struct ktermios *old)
+{
+	unsigned int baud;
+	unsigned int divisor;
+	u16 prescaler;
+
+	/* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
+	 * ipb freq */
+	baud = uart_get_baud_rate(port, new, old,
+				  port->uartclk / (32 * 0xffff) + 1,
+				  port->uartclk / 4);
+	divisor = (port->uartclk + 2 * baud) / (4 * baud);
+
+	/* select the proper prescaler and set the divisor
+	 * prefer high prescaler for more tolerance on low baudrates */
+	if (divisor > 0xffff || baud <= 115200) {
+		divisor = (divisor + 4) / 8;
+		prescaler = 0xdd00; /* /32 */
+	} else
+		prescaler = 0xff00; /* /4 */
+	mpc52xx_set_divisor(PSC(port), prescaler, divisor);
+	return baud;
+}
+
+static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
+{
+	port->irqflags = 0;
+	port->irq = irq_of_parse_and_map(np, 0);
+}
+
+/* 52xx specific interrupt handler. The caller holds the port lock */
+static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
+{
+	return mpc5xxx_uart_process_int(port);
+}
+
+static const struct psc_ops mpc52xx_psc_ops = {
+	.fifo_init = mpc52xx_psc_fifo_init,
+	.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
+	.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
+	.rx_rdy = mpc52xx_psc_rx_rdy,
+	.tx_rdy = mpc52xx_psc_tx_rdy,
+	.tx_empty = mpc52xx_psc_tx_empty,
+	.stop_rx = mpc52xx_psc_stop_rx,
+	.start_tx = mpc52xx_psc_start_tx,
+	.stop_tx = mpc52xx_psc_stop_tx,
+	.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
+	.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
+	.write_char = mpc52xx_psc_write_char,
+	.read_char = mpc52xx_psc_read_char,
+	.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
+	.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
+	.set_baudrate = mpc5200_psc_set_baudrate,
+	.get_irq = mpc52xx_psc_get_irq,
+	.handle_irq = mpc52xx_psc_handle_irq,
+	.get_status = mpc52xx_psc_get_status,
+	.get_ipcr = mpc52xx_psc_get_ipcr,
+	.command = mpc52xx_psc_command,
+	.set_mode = mpc52xx_psc_set_mode,
+	.set_rts = mpc52xx_psc_set_rts,
+	.enable_ms = mpc52xx_psc_enable_ms,
+	.set_sicr = mpc52xx_psc_set_sicr,
+	.set_imr = mpc52xx_psc_set_imr,
+	.get_mr1 = mpc52xx_psc_get_mr1,
+};
+
+static const struct psc_ops mpc5200b_psc_ops = {
+	.fifo_init = mpc52xx_psc_fifo_init,
+	.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
+	.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
+	.rx_rdy = mpc52xx_psc_rx_rdy,
+	.tx_rdy = mpc52xx_psc_tx_rdy,
+	.tx_empty = mpc52xx_psc_tx_empty,
+	.stop_rx = mpc52xx_psc_stop_rx,
+	.start_tx = mpc52xx_psc_start_tx,
+	.stop_tx = mpc52xx_psc_stop_tx,
+	.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
+	.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
+	.write_char = mpc52xx_psc_write_char,
+	.read_char = mpc52xx_psc_read_char,
+	.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
+	.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
+	.set_baudrate = mpc5200b_psc_set_baudrate,
+	.get_irq = mpc52xx_psc_get_irq,
+	.handle_irq = mpc52xx_psc_handle_irq,
+	.get_status = mpc52xx_psc_get_status,
+	.get_ipcr = mpc52xx_psc_get_ipcr,
+	.command = mpc52xx_psc_command,
+	.set_mode = mpc52xx_psc_set_mode,
+	.set_rts = mpc52xx_psc_set_rts,
+	.enable_ms = mpc52xx_psc_enable_ms,
+	.set_sicr = mpc52xx_psc_set_sicr,
+	.set_imr = mpc52xx_psc_set_imr,
+	.get_mr1 = mpc52xx_psc_get_mr1,
+};
+
+#endif /* CONFIG_PPC_MPC52xx */
+
+#ifdef CONFIG_PPC_MPC512x
+#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
+
+/* PSC FIFO Controller for mpc512x */
+struct psc_fifoc {
+	u32 fifoc_cmd;
+	u32 fifoc_int;
+	u32 fifoc_dma;
+	u32 fifoc_axe;
+	u32 fifoc_debug;
+};
+
+static struct psc_fifoc __iomem *psc_fifoc;
+static unsigned int psc_fifoc_irq;
+static struct clk *psc_fifoc_clk;
+
+static void mpc512x_psc_fifo_init(struct uart_port *port)
+{
+	/* /32 prescaler */
+	out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
+
+	out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
+	out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
+	out_be32(&FIFO_512x(port)->txalarm, 1);
+	out_be32(&FIFO_512x(port)->tximr, 0);
+
+	out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
+	out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
+	out_be32(&FIFO_512x(port)->rxalarm, 1);
+	out_be32(&FIFO_512x(port)->rximr, 0);
+
+	out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
+	out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
+}
+
+static unsigned int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
+{
+	return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
+}
+
+static unsigned int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
+{
+	return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
+}
+
+static unsigned int mpc512x_psc_rx_rdy(struct uart_port *port)
+{
+	return in_be32(&FIFO_512x(port)->rxsr)
+	    & in_be32(&FIFO_512x(port)->rximr)
+	    & MPC512x_PSC_FIFO_ALARM;
+}
+
+static unsigned int mpc512x_psc_tx_rdy(struct uart_port *port)
+{
+	return in_be32(&FIFO_512x(port)->txsr)
+	    & in_be32(&FIFO_512x(port)->tximr)
+	    & MPC512x_PSC_FIFO_ALARM;
+}
+
+static unsigned int mpc512x_psc_tx_empty(struct uart_port *port)
+{
+	return in_be32(&FIFO_512x(port)->txsr)
+	    & MPC512x_PSC_FIFO_EMPTY;
+}
+
+static void mpc512x_psc_stop_rx(struct uart_port *port)
+{
+	unsigned long rx_fifo_imr;
+
+	rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
+	rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
+	out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
+}
+
+static void mpc512x_psc_start_tx(struct uart_port *port)
+{
+	unsigned long tx_fifo_imr;
+
+	tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
+	tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
+	out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
+}
+
+static void mpc512x_psc_stop_tx(struct uart_port *port)
+{
+	unsigned long tx_fifo_imr;
+
+	tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
+	tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
+	out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
+}
+
+static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
+{
+	out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
+}
+
+static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
+{
+	out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
+}
+
+static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
+{
+	out_8(&FIFO_512x(port)->txdata_8, c);
+}
+
+static unsigned char mpc512x_psc_read_char(struct uart_port *port)
+{
+	return in_8(&FIFO_512x(port)->rxdata_8);
+}
+
+static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
+{
+	port->read_status_mask =
+		in_be32(&FIFO_512x(port)->tximr) << 16 |
+		in_be32(&FIFO_512x(port)->rximr);
+	out_be32(&FIFO_512x(port)->tximr, 0);
+	out_be32(&FIFO_512x(port)->rximr, 0);
+}
+
+static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
+{
+	out_be32(&FIFO_512x(port)->tximr,
+		(port->read_status_mask >> 16) & 0x7f);
+	out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
+}
+
+static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
+					     struct ktermios *new,
+					     const struct ktermios *old)
+{
+	unsigned int baud;
+	unsigned int divisor;
+
+	/*
+	 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
+	 * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
+	 * Furthermore, it states that "After reset, the prescaler by 10
+	 * for the UART mode is selected", but the reset register value is
+	 * 0x0000 which means a /32 prescaler. This is wrong.
+	 *
+	 * In reality using /32 prescaler doesn't work, as it is not supported!
+	 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
+	 * Chapter 4.1 PSC in UART Mode.
+	 * Calculate with a /16 prescaler here.
+	 */
+
+	/* uartclk contains the ips freq */
+	baud = uart_get_baud_rate(port, new, old,
+				  port->uartclk / (16 * 0xffff) + 1,
+				  port->uartclk / 16);
+	divisor = (port->uartclk + 8 * baud) / (16 * baud);
+
+	/* enable the /16 prescaler and set the divisor */
+	mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
+	return baud;
+}
+
+/* Init PSC FIFO Controller */
+static int __init mpc512x_psc_fifoc_init(void)
+{
+	int err;
+	struct device_node *np;
+	struct clk *clk;
+
+	/* default error code, potentially overwritten by clock calls */
+	err = -ENODEV;
+
+	np = of_find_compatible_node(NULL, NULL,
+				     "fsl,mpc5121-psc-fifo");
+	if (!np) {
+		pr_err("%s: Can't find FIFOC node\n", __func__);
+		goto out_err;
+	}
+
+	clk = of_clk_get(np, 0);
+	if (IS_ERR(clk)) {
+		/* backwards compat with device trees that lack clock specs */
+		clk = clk_get_sys(np->name, "ipg");
+	}
+	if (IS_ERR(clk)) {
+		pr_err("%s: Can't lookup FIFO clock\n", __func__);
+		err = PTR_ERR(clk);
+		goto out_ofnode_put;
+	}
+	if (clk_prepare_enable(clk)) {
+		pr_err("%s: Can't enable FIFO clock\n", __func__);
+		clk_put(clk);
+		goto out_ofnode_put;
+	}
+	psc_fifoc_clk = clk;
+
+	psc_fifoc = of_iomap(np, 0);
+	if (!psc_fifoc) {
+		pr_err("%s: Can't map FIFOC\n", __func__);
+		goto out_clk_disable;
+	}
+
+	psc_fifoc_irq = irq_of_parse_and_map(np, 0);
+	if (psc_fifoc_irq == 0) {
+		pr_err("%s: Can't get FIFOC irq\n", __func__);
+		goto out_unmap;
+	}
+
+	of_node_put(np);
+	return 0;
+
+out_unmap:
+	iounmap(psc_fifoc);
+out_clk_disable:
+	clk_disable_unprepare(psc_fifoc_clk);
+	clk_put(psc_fifoc_clk);
+out_ofnode_put:
+	of_node_put(np);
+out_err:
+	return err;
+}
+
+static void __exit mpc512x_psc_fifoc_uninit(void)
+{
+	iounmap(psc_fifoc);
+
+	/* disable the clock, errors are not fatal */
+	if (psc_fifoc_clk) {
+		clk_disable_unprepare(psc_fifoc_clk);
+		clk_put(psc_fifoc_clk);
+		psc_fifoc_clk = NULL;
+	}
+}
+
+/* 512x specific interrupt handler. The caller holds the port lock */
+static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
+{
+	unsigned long fifoc_int;
+	int psc_num;
+
+	/* Read pending PSC FIFOC interrupts */
+	fifoc_int = in_be32(&psc_fifoc->fifoc_int);
+
+	/* Check if it is an interrupt for this port */
+	psc_num = (port->mapbase & 0xf00) >> 8;
+	if (test_bit(psc_num, &fifoc_int) ||
+	    test_bit(psc_num + 16, &fifoc_int))
+		return mpc5xxx_uart_process_int(port);
+
+	return IRQ_NONE;
+}
+
+static struct clk *psc_mclk_clk[MPC52xx_PSC_MAXNUM];
+static struct clk *psc_ipg_clk[MPC52xx_PSC_MAXNUM];
+
+/* called from within the .request_port() callback (allocation) */
+static int mpc512x_psc_alloc_clock(struct uart_port *port)
+{
+	int psc_num;
+	struct clk *clk;
+	int err;
+
+	psc_num = (port->mapbase & 0xf00) >> 8;
+
+	clk = devm_clk_get(port->dev, "mclk");
+	if (IS_ERR(clk)) {
+		dev_err(port->dev, "Failed to get MCLK!\n");
+		err = PTR_ERR(clk);
+		goto out_err;
+	}
+	err = clk_prepare_enable(clk);
+	if (err) {
+		dev_err(port->dev, "Failed to enable MCLK!\n");
+		goto out_err;
+	}
+	psc_mclk_clk[psc_num] = clk;
+
+	clk = devm_clk_get(port->dev, "ipg");
+	if (IS_ERR(clk)) {
+		dev_err(port->dev, "Failed to get IPG clock!\n");
+		err = PTR_ERR(clk);
+		goto out_err;
+	}
+	err = clk_prepare_enable(clk);
+	if (err) {
+		dev_err(port->dev, "Failed to enable IPG clock!\n");
+		goto out_err;
+	}
+	psc_ipg_clk[psc_num] = clk;
+
+	return 0;
+
+out_err:
+	if (psc_mclk_clk[psc_num]) {
+		clk_disable_unprepare(psc_mclk_clk[psc_num]);
+		psc_mclk_clk[psc_num] = NULL;
+	}
+	if (psc_ipg_clk[psc_num]) {
+		clk_disable_unprepare(psc_ipg_clk[psc_num]);
+		psc_ipg_clk[psc_num] = NULL;
+	}
+	return err;
+}
+
+/* called from within the .release_port() callback (release) */
+static void mpc512x_psc_relse_clock(struct uart_port *port)
+{
+	int psc_num;
+	struct clk *clk;
+
+	psc_num = (port->mapbase & 0xf00) >> 8;
+	clk = psc_mclk_clk[psc_num];
+	if (clk) {
+		clk_disable_unprepare(clk);
+		psc_mclk_clk[psc_num] = NULL;
+	}
+	if (psc_ipg_clk[psc_num]) {
+		clk_disable_unprepare(psc_ipg_clk[psc_num]);
+		psc_ipg_clk[psc_num] = NULL;
+	}
+}
+
+/* implementation of the .clock() callback (enable/disable) */
+static int mpc512x_psc_endis_clock(struct uart_port *port, int enable)
+{
+	int psc_num;
+	struct clk *psc_clk;
+	int ret;
+
+	if (uart_console(port))
+		return 0;
+
+	psc_num = (port->mapbase & 0xf00) >> 8;
+	psc_clk = psc_mclk_clk[psc_num];
+	if (!psc_clk) {
+		dev_err(port->dev, "Failed to get PSC clock entry!\n");
+		return -ENODEV;
+	}
+
+	dev_dbg(port->dev, "mclk %sable\n", enable ? "en" : "dis");
+	if (enable) {
+		ret = clk_enable(psc_clk);
+		if (ret)
+			dev_err(port->dev, "Failed to enable MCLK!\n");
+		return ret;
+	} else {
+		clk_disable(psc_clk);
+		return 0;
+	}
+}
+
+static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
+{
+	port->irqflags = IRQF_SHARED;
+	port->irq = psc_fifoc_irq;
+}
+
+#define PSC_5125(port) ((struct mpc5125_psc __iomem *)((port)->membase))
+#define FIFO_5125(port) ((struct mpc512x_psc_fifo __iomem *)(PSC_5125(port)+1))
+
+static void mpc5125_psc_fifo_init(struct uart_port *port)
+{
+	/* /32 prescaler */
+	out_8(&PSC_5125(port)->mpc52xx_psc_clock_select, 0xdd);
+
+	out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
+	out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
+	out_be32(&FIFO_5125(port)->txalarm, 1);
+	out_be32(&FIFO_5125(port)->tximr, 0);
+
+	out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
+	out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
+	out_be32(&FIFO_5125(port)->rxalarm, 1);
+	out_be32(&FIFO_5125(port)->rximr, 0);
+
+	out_be32(&FIFO_5125(port)->tximr, MPC512x_PSC_FIFO_ALARM);
+	out_be32(&FIFO_5125(port)->rximr, MPC512x_PSC_FIFO_ALARM);
+}
+
+static unsigned int mpc5125_psc_raw_rx_rdy(struct uart_port *port)
+{
+	return !(in_be32(&FIFO_5125(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
+}
+
+static unsigned int mpc5125_psc_raw_tx_rdy(struct uart_port *port)
+{
+	return !(in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_FULL);
+}
+
+static unsigned int mpc5125_psc_rx_rdy(struct uart_port *port)
+{
+	return in_be32(&FIFO_5125(port)->rxsr) &
+	       in_be32(&FIFO_5125(port)->rximr) & MPC512x_PSC_FIFO_ALARM;
+}
+
+static unsigned int mpc5125_psc_tx_rdy(struct uart_port *port)
+{
+	return in_be32(&FIFO_5125(port)->txsr) &
+	       in_be32(&FIFO_5125(port)->tximr) & MPC512x_PSC_FIFO_ALARM;
+}
+
+static unsigned int mpc5125_psc_tx_empty(struct uart_port *port)
+{
+	return in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_EMPTY;
+}
+
+static void mpc5125_psc_stop_rx(struct uart_port *port)
+{
+	unsigned long rx_fifo_imr;
+
+	rx_fifo_imr = in_be32(&FIFO_5125(port)->rximr);
+	rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
+	out_be32(&FIFO_5125(port)->rximr, rx_fifo_imr);
+}
+
+static void mpc5125_psc_start_tx(struct uart_port *port)
+{
+	unsigned long tx_fifo_imr;
+
+	tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
+	tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
+	out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
+}
+
+static void mpc5125_psc_stop_tx(struct uart_port *port)
+{
+	unsigned long tx_fifo_imr;
+
+	tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
+	tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
+	out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
+}
+
+static void mpc5125_psc_rx_clr_irq(struct uart_port *port)
+{
+	out_be32(&FIFO_5125(port)->rxisr, in_be32(&FIFO_5125(port)->rxisr));
+}
+
+static void mpc5125_psc_tx_clr_irq(struct uart_port *port)
+{
+	out_be32(&FIFO_5125(port)->txisr, in_be32(&FIFO_5125(port)->txisr));
+}
+
+static void mpc5125_psc_write_char(struct uart_port *port, unsigned char c)
+{
+	out_8(&FIFO_5125(port)->txdata_8, c);
+}
+
+static unsigned char mpc5125_psc_read_char(struct uart_port *port)
+{
+	return in_8(&FIFO_5125(port)->rxdata_8);
+}
+
+static void mpc5125_psc_cw_disable_ints(struct uart_port *port)
+{
+	port->read_status_mask =
+		in_be32(&FIFO_5125(port)->tximr) << 16 |
+		in_be32(&FIFO_5125(port)->rximr);
+	out_be32(&FIFO_5125(port)->tximr, 0);
+	out_be32(&FIFO_5125(port)->rximr, 0);
+}
+
+static void mpc5125_psc_cw_restore_ints(struct uart_port *port)
+{
+	out_be32(&FIFO_5125(port)->tximr,
+		(port->read_status_mask >> 16) & 0x7f);
+	out_be32(&FIFO_5125(port)->rximr, port->read_status_mask & 0x7f);
+}
+
+static inline void mpc5125_set_divisor(struct mpc5125_psc __iomem *psc,
+		u8 prescaler, unsigned int divisor)
+{
+	/* select prescaler */
+	out_8(&psc->mpc52xx_psc_clock_select, prescaler);
+	out_8(&psc->ctur, divisor >> 8);
+	out_8(&psc->ctlr, divisor & 0xff);
+}
+
+static unsigned int mpc5125_psc_set_baudrate(struct uart_port *port,
+					     struct ktermios *new,
+					     const struct ktermios *old)
+{
+	unsigned int baud;
+	unsigned int divisor;
+
+	/*
+	 * Calculate with a /16 prescaler here.
+	 */
+
+	/* uartclk contains the ips freq */
+	baud = uart_get_baud_rate(port, new, old,
+				  port->uartclk / (16 * 0xffff) + 1,
+				  port->uartclk / 16);
+	divisor = (port->uartclk + 8 * baud) / (16 * baud);
+
+	/* enable the /16 prescaler and set the divisor */
+	mpc5125_set_divisor(PSC_5125(port), 0xdd, divisor);
+	return baud;
+}
+
+/*
+ * MPC5125 have compatible PSC FIFO Controller.
+ * Special init not needed.
+ */
+static u16 mpc5125_psc_get_status(struct uart_port *port)
+{
+	return in_be16(&PSC_5125(port)->mpc52xx_psc_status);
+}
+
+static u8 mpc5125_psc_get_ipcr(struct uart_port *port)
+{
+	return in_8(&PSC_5125(port)->mpc52xx_psc_ipcr);
+}
+
+static void mpc5125_psc_command(struct uart_port *port, u8 cmd)
+{
+	out_8(&PSC_5125(port)->command, cmd);
+}
+
+static void mpc5125_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
+{
+	out_8(&PSC_5125(port)->mr1, mr1);
+	out_8(&PSC_5125(port)->mr2, mr2);
+}
+
+static void mpc5125_psc_set_rts(struct uart_port *port, int state)
+{
+	if (state & TIOCM_RTS)
+		out_8(&PSC_5125(port)->op1, MPC52xx_PSC_OP_RTS);
+	else
+		out_8(&PSC_5125(port)->op0, MPC52xx_PSC_OP_RTS);
+}
+
+static void mpc5125_psc_enable_ms(struct uart_port *port)
+{
+	struct mpc5125_psc __iomem *psc = PSC_5125(port);
+
+	/* clear D_*-bits by reading them */
+	in_8(&psc->mpc52xx_psc_ipcr);
+	/* enable CTS and DCD as IPC interrupts */
+	out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
+
+	port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
+	out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void mpc5125_psc_set_sicr(struct uart_port *port, u32 val)
+{
+	out_be32(&PSC_5125(port)->sicr, val);
+}
+
+static void mpc5125_psc_set_imr(struct uart_port *port, u16 val)
+{
+	out_be16(&PSC_5125(port)->mpc52xx_psc_imr, val);
+}
+
+static u8 mpc5125_psc_get_mr1(struct uart_port *port)
+{
+	return in_8(&PSC_5125(port)->mr1);
+}
+
+static const struct psc_ops mpc5125_psc_ops = {
+	.fifo_init = mpc5125_psc_fifo_init,
+	.raw_rx_rdy = mpc5125_psc_raw_rx_rdy,
+	.raw_tx_rdy = mpc5125_psc_raw_tx_rdy,
+	.rx_rdy = mpc5125_psc_rx_rdy,
+	.tx_rdy = mpc5125_psc_tx_rdy,
+	.tx_empty = mpc5125_psc_tx_empty,
+	.stop_rx = mpc5125_psc_stop_rx,
+	.start_tx = mpc5125_psc_start_tx,
+	.stop_tx = mpc5125_psc_stop_tx,
+	.rx_clr_irq = mpc5125_psc_rx_clr_irq,
+	.tx_clr_irq = mpc5125_psc_tx_clr_irq,
+	.write_char = mpc5125_psc_write_char,
+	.read_char = mpc5125_psc_read_char,
+	.cw_disable_ints = mpc5125_psc_cw_disable_ints,
+	.cw_restore_ints = mpc5125_psc_cw_restore_ints,
+	.set_baudrate = mpc5125_psc_set_baudrate,
+	.clock_alloc = mpc512x_psc_alloc_clock,
+	.clock_relse = mpc512x_psc_relse_clock,
+	.clock = mpc512x_psc_endis_clock,
+	.fifoc_init = mpc512x_psc_fifoc_init,
+	.fifoc_uninit = mpc512x_psc_fifoc_uninit,
+	.get_irq = mpc512x_psc_get_irq,
+	.handle_irq = mpc512x_psc_handle_irq,
+	.get_status = mpc5125_psc_get_status,
+	.get_ipcr = mpc5125_psc_get_ipcr,
+	.command = mpc5125_psc_command,
+	.set_mode = mpc5125_psc_set_mode,
+	.set_rts = mpc5125_psc_set_rts,
+	.enable_ms = mpc5125_psc_enable_ms,
+	.set_sicr = mpc5125_psc_set_sicr,
+	.set_imr = mpc5125_psc_set_imr,
+	.get_mr1 = mpc5125_psc_get_mr1,
+};
+
+static const struct psc_ops mpc512x_psc_ops = {
+	.fifo_init = mpc512x_psc_fifo_init,
+	.raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
+	.raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
+	.rx_rdy = mpc512x_psc_rx_rdy,
+	.tx_rdy = mpc512x_psc_tx_rdy,
+	.tx_empty = mpc512x_psc_tx_empty,
+	.stop_rx = mpc512x_psc_stop_rx,
+	.start_tx = mpc512x_psc_start_tx,
+	.stop_tx = mpc512x_psc_stop_tx,
+	.rx_clr_irq = mpc512x_psc_rx_clr_irq,
+	.tx_clr_irq = mpc512x_psc_tx_clr_irq,
+	.write_char = mpc512x_psc_write_char,
+	.read_char = mpc512x_psc_read_char,
+	.cw_disable_ints = mpc512x_psc_cw_disable_ints,
+	.cw_restore_ints = mpc512x_psc_cw_restore_ints,
+	.set_baudrate = mpc512x_psc_set_baudrate,
+	.clock_alloc = mpc512x_psc_alloc_clock,
+	.clock_relse = mpc512x_psc_relse_clock,
+	.clock = mpc512x_psc_endis_clock,
+	.fifoc_init = mpc512x_psc_fifoc_init,
+	.fifoc_uninit = mpc512x_psc_fifoc_uninit,
+	.get_irq = mpc512x_psc_get_irq,
+	.handle_irq = mpc512x_psc_handle_irq,
+	.get_status = mpc52xx_psc_get_status,
+	.get_ipcr = mpc52xx_psc_get_ipcr,
+	.command = mpc52xx_psc_command,
+	.set_mode = mpc52xx_psc_set_mode,
+	.set_rts = mpc52xx_psc_set_rts,
+	.enable_ms = mpc52xx_psc_enable_ms,
+	.set_sicr = mpc52xx_psc_set_sicr,
+	.set_imr = mpc52xx_psc_set_imr,
+	.get_mr1 = mpc52xx_psc_get_mr1,
+};
+#endif /* CONFIG_PPC_MPC512x */
+
+
+static const struct psc_ops *psc_ops;
+
+/* ======================================================================== */
+/* UART operations                                                          */
+/* ======================================================================== */
+
+static unsigned int
+mpc52xx_uart_tx_empty(struct uart_port *port)
+{
+	return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
+}
+
+static void
+mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	psc_ops->set_rts(port, mctrl & TIOCM_RTS);
+}
+
+static unsigned int
+mpc52xx_uart_get_mctrl(struct uart_port *port)
+{
+	unsigned int ret = TIOCM_DSR;
+	u8 status = psc_ops->get_ipcr(port);
+
+	if (!(status & MPC52xx_PSC_CTS))
+		ret |= TIOCM_CTS;
+	if (!(status & MPC52xx_PSC_DCD))
+		ret |= TIOCM_CAR;
+
+	return ret;
+}
+
+static void
+mpc52xx_uart_stop_tx(struct uart_port *port)
+{
+	/* port->lock taken by caller */
+	psc_ops->stop_tx(port);
+}
+
+static void
+mpc52xx_uart_start_tx(struct uart_port *port)
+{
+	/* port->lock taken by caller */
+	psc_ops->start_tx(port);
+}
+
+static void
+mpc52xx_uart_stop_rx(struct uart_port *port)
+{
+	/* port->lock taken by caller */
+	psc_ops->stop_rx(port);
+}
+
+static void
+mpc52xx_uart_enable_ms(struct uart_port *port)
+{
+	psc_ops->enable_ms(port);
+}
+
+static void
+mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (ctl == -1)
+		psc_ops->command(port, MPC52xx_PSC_START_BRK);
+	else
+		psc_ops->command(port, MPC52xx_PSC_STOP_BRK);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int
+mpc52xx_uart_startup(struct uart_port *port)
+{
+	int ret;
+
+	if (psc_ops->clock) {
+		ret = psc_ops->clock(port, 1);
+		if (ret)
+			return ret;
+	}
+
+	/* Request IRQ */
+	ret = request_irq(port->irq, mpc52xx_uart_int,
+			  port->irqflags, "mpc52xx_psc_uart", port);
+	if (ret)
+		return ret;
+
+	/* Reset/activate the port, clear and enable interrupts */
+	psc_ops->command(port, MPC52xx_PSC_RST_RX);
+	psc_ops->command(port, MPC52xx_PSC_RST_TX);
+
+	/*
+	 * According to Freescale's support the RST_TX command can produce a
+	 * spike on the TX pin. So they recommend to delay "for one character".
+	 * One millisecond should be enough for everyone.
+	 */
+	msleep(1);
+
+	psc_ops->set_sicr(port, 0);	/* UART mode DCD ignored */
+
+	psc_ops->fifo_init(port);
+
+	psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
+	psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
+
+	return 0;
+}
+
+static void
+mpc52xx_uart_shutdown(struct uart_port *port)
+{
+	/* Shut down the port.  Leave TX active if on a console port */
+	psc_ops->command(port, MPC52xx_PSC_RST_RX);
+	if (!uart_console(port))
+		psc_ops->command(port, MPC52xx_PSC_RST_TX);
+
+	port->read_status_mask = 0;
+	psc_ops->set_imr(port, port->read_status_mask);
+
+	if (psc_ops->clock)
+		psc_ops->clock(port, 0);
+
+	/* Disable interrupt */
+	psc_ops->cw_disable_ints(port);
+
+	/* Release interrupt */
+	free_irq(port->irq, port);
+}
+
+static void
+mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
+			 const struct ktermios *old)
+{
+	unsigned long flags;
+	unsigned char mr1, mr2;
+	unsigned int j;
+	unsigned int baud;
+
+	/* Prepare what we're gonna write */
+	mr1 = 0;
+
+	switch (new->c_cflag & CSIZE) {
+	case CS5:	mr1 |= MPC52xx_PSC_MODE_5_BITS;
+		break;
+	case CS6:	mr1 |= MPC52xx_PSC_MODE_6_BITS;
+		break;
+	case CS7:	mr1 |= MPC52xx_PSC_MODE_7_BITS;
+		break;
+	case CS8:
+	default:	mr1 |= MPC52xx_PSC_MODE_8_BITS;
+	}
+
+	if (new->c_cflag & PARENB) {
+		if (new->c_cflag & CMSPAR)
+			mr1 |= MPC52xx_PSC_MODE_PARFORCE;
+
+		/* With CMSPAR, PARODD also means high parity (same as termios) */
+		mr1 |= (new->c_cflag & PARODD) ?
+			MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
+	} else {
+		mr1 |= MPC52xx_PSC_MODE_PARNONE;
+	}
+
+	mr2 = 0;
+
+	if (new->c_cflag & CSTOPB)
+		mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
+	else
+		mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
+			MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
+			MPC52xx_PSC_MODE_ONE_STOP;
+
+	if (new->c_cflag & CRTSCTS) {
+		mr1 |= MPC52xx_PSC_MODE_RXRTS;
+		mr2 |= MPC52xx_PSC_MODE_TXCTS;
+	}
+
+	/* Get the lock */
+	spin_lock_irqsave(&port->lock, flags);
+
+	/* Do our best to flush TX & RX, so we don't lose anything */
+	/* But we don't wait indefinitely ! */
+	j = 5000000;	/* Maximum wait */
+	/* FIXME Can't receive chars since set_termios might be called at early
+	 * boot for the console, all stuff is not yet ready to receive at that
+	 * time and that just makes the kernel oops */
+	/* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
+	while (!mpc52xx_uart_tx_empty(port) && --j)
+		udelay(1);
+
+	if (!j)
+		printk(KERN_ERR "mpc52xx_uart.c: "
+			"Unable to flush RX & TX fifos in-time in set_termios."
+			"Some chars may have been lost.\n");
+
+	/* Reset the TX & RX */
+	psc_ops->command(port, MPC52xx_PSC_RST_RX);
+	psc_ops->command(port, MPC52xx_PSC_RST_TX);
+
+	/* Send new mode settings */
+	psc_ops->set_mode(port, mr1, mr2);
+	baud = psc_ops->set_baudrate(port, new, old);
+
+	/* Update the per-port timeout */
+	uart_update_timeout(port, new->c_cflag, baud);
+
+	if (UART_ENABLE_MS(port, new->c_cflag))
+		mpc52xx_uart_enable_ms(port);
+
+	/* Reenable TX & RX */
+	psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
+	psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
+
+	/* We're all set, release the lock */
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *
+mpc52xx_uart_type(struct uart_port *port)
+{
+	/*
+	 * We keep using PORT_MPC52xx for historic reasons although it applies
+	 * for MPC512x, too, but print "MPC5xxx" to not irritate users
+	 */
+	return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
+}
+
+static void
+mpc52xx_uart_release_port(struct uart_port *port)
+{
+	if (psc_ops->clock_relse)
+		psc_ops->clock_relse(port);
+
+	/* remapped by us ? */
+	if (port->flags & UPF_IOREMAP) {
+		iounmap(port->membase);
+		port->membase = NULL;
+	}
+
+	release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
+}
+
+static int
+mpc52xx_uart_request_port(struct uart_port *port)
+{
+	int err;
+
+	if (port->flags & UPF_IOREMAP) /* Need to remap ? */
+		port->membase = ioremap(port->mapbase,
+					sizeof(struct mpc52xx_psc));
+
+	if (!port->membase)
+		return -EINVAL;
+
+	err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
+			"mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
+
+	if (err)
+		goto out_membase;
+
+	if (psc_ops->clock_alloc) {
+		err = psc_ops->clock_alloc(port);
+		if (err)
+			goto out_mapregion;
+	}
+
+	return 0;
+
+out_mapregion:
+	release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
+out_membase:
+	if (port->flags & UPF_IOREMAP) {
+		iounmap(port->membase);
+		port->membase = NULL;
+	}
+	return err;
+}
+
+static void
+mpc52xx_uart_config_port(struct uart_port *port, int flags)
+{
+	if ((flags & UART_CONFIG_TYPE)
+		&& (mpc52xx_uart_request_port(port) == 0))
+		port->type = PORT_MPC52xx;
+}
+
+static int
+mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
+		return -EINVAL;
+
+	if ((ser->irq != port->irq) ||
+	    (ser->io_type != UPIO_MEM) ||
+	    (ser->baud_base != port->uartclk)  ||
+	    (ser->iomem_base != (void *)port->mapbase) ||
+	    (ser->hub6 != 0))
+		return -EINVAL;
+
+	return 0;
+}
+
+
+static const struct uart_ops mpc52xx_uart_ops = {
+	.tx_empty	= mpc52xx_uart_tx_empty,
+	.set_mctrl	= mpc52xx_uart_set_mctrl,
+	.get_mctrl	= mpc52xx_uart_get_mctrl,
+	.stop_tx	= mpc52xx_uart_stop_tx,
+	.start_tx	= mpc52xx_uart_start_tx,
+	.stop_rx	= mpc52xx_uart_stop_rx,
+	.enable_ms	= mpc52xx_uart_enable_ms,
+	.break_ctl	= mpc52xx_uart_break_ctl,
+	.startup	= mpc52xx_uart_startup,
+	.shutdown	= mpc52xx_uart_shutdown,
+	.set_termios	= mpc52xx_uart_set_termios,
+/*	.pm		= mpc52xx_uart_pm,		Not supported yet */
+	.type		= mpc52xx_uart_type,
+	.release_port	= mpc52xx_uart_release_port,
+	.request_port	= mpc52xx_uart_request_port,
+	.config_port	= mpc52xx_uart_config_port,
+	.verify_port	= mpc52xx_uart_verify_port
+};
+
+
+/* ======================================================================== */
+/* Interrupt handling                                                       */
+/* ======================================================================== */
+
+static inline bool
+mpc52xx_uart_int_rx_chars(struct uart_port *port)
+{
+	struct tty_port *tport = &port->state->port;
+	unsigned char ch, flag;
+	unsigned short status;
+
+	/* While we can read, do so ! */
+	while (psc_ops->raw_rx_rdy(port)) {
+		/* Get the char */
+		ch = psc_ops->read_char(port);
+
+		/* Handle sysreq char */
+		if (uart_handle_sysrq_char(port, ch))
+			continue;
+
+		/* Store it */
+
+		flag = TTY_NORMAL;
+		port->icount.rx++;
+
+		status = psc_ops->get_status(port);
+
+		if (status & (MPC52xx_PSC_SR_PE |
+			      MPC52xx_PSC_SR_FE |
+			      MPC52xx_PSC_SR_RB)) {
+
+			if (status & MPC52xx_PSC_SR_RB) {
+				flag = TTY_BREAK;
+				uart_handle_break(port);
+				port->icount.brk++;
+			} else if (status & MPC52xx_PSC_SR_PE) {
+				flag = TTY_PARITY;
+				port->icount.parity++;
+			}
+			else if (status & MPC52xx_PSC_SR_FE) {
+				flag = TTY_FRAME;
+				port->icount.frame++;
+			}
+
+			/* Clear error condition */
+			psc_ops->command(port, MPC52xx_PSC_RST_ERR_STAT);
+
+		}
+		tty_insert_flip_char(tport, ch, flag);
+		if (status & MPC52xx_PSC_SR_OE) {
+			/*
+			 * Overrun is special, since it's
+			 * reported immediately, and doesn't
+			 * affect the current character
+			 */
+			tty_insert_flip_char(tport, 0, TTY_OVERRUN);
+			port->icount.overrun++;
+		}
+	}
+
+	tty_flip_buffer_push(tport);
+
+	return psc_ops->raw_rx_rdy(port);
+}
+
+static inline bool
+mpc52xx_uart_int_tx_chars(struct uart_port *port)
+{
+	u8 ch;
+
+	return uart_port_tx(port, ch,
+		psc_ops->raw_tx_rdy(port),
+		psc_ops->write_char(port, ch));
+}
+
+static irqreturn_t
+mpc5xxx_uart_process_int(struct uart_port *port)
+{
+	unsigned long pass = ISR_PASS_LIMIT;
+	bool keepgoing;
+	u8 status;
+
+	/* While we have stuff to do, we continue */
+	do {
+		/* If we don't find anything to do, we stop */
+		keepgoing = false;
+
+		psc_ops->rx_clr_irq(port);
+		if (psc_ops->rx_rdy(port))
+			keepgoing |= mpc52xx_uart_int_rx_chars(port);
+
+		psc_ops->tx_clr_irq(port);
+		if (psc_ops->tx_rdy(port))
+			keepgoing |= mpc52xx_uart_int_tx_chars(port);
+
+		status = psc_ops->get_ipcr(port);
+		if (status & MPC52xx_PSC_D_DCD)
+			uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
+
+		if (status & MPC52xx_PSC_D_CTS)
+			uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
+
+		/* Limit number of iteration */
+		if (!(--pass))
+			keepgoing = false;
+
+	} while (keepgoing);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t
+mpc52xx_uart_int(int irq, void *dev_id)
+{
+	struct uart_port *port = dev_id;
+	irqreturn_t ret;
+
+	spin_lock(&port->lock);
+
+	ret = psc_ops->handle_irq(port);
+
+	spin_unlock(&port->lock);
+
+	return ret;
+}
+
+/* ======================================================================== */
+/* Console ( if applicable )                                                */
+/* ======================================================================== */
+
+#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
+
+static void __init
+mpc52xx_console_get_options(struct uart_port *port,
+			    int *baud, int *parity, int *bits, int *flow)
+{
+	unsigned char mr1;
+
+	pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
+
+	/* Read the mode registers */
+	mr1 = psc_ops->get_mr1(port);
+
+	/* CT{U,L}R are write-only ! */
+	*baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
+
+	/* Parse them */
+	switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
+	case MPC52xx_PSC_MODE_5_BITS:
+		*bits = 5;
+		break;
+	case MPC52xx_PSC_MODE_6_BITS:
+		*bits = 6;
+		break;
+	case MPC52xx_PSC_MODE_7_BITS:
+		*bits = 7;
+		break;
+	case MPC52xx_PSC_MODE_8_BITS:
+	default:
+		*bits = 8;
+	}
+
+	if (mr1 & MPC52xx_PSC_MODE_PARNONE)
+		*parity = 'n';
+	else
+		*parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
+}
+
+static void
+mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
+{
+	struct uart_port *port = &mpc52xx_uart_ports[co->index];
+	unsigned int i, j;
+
+	/* Disable interrupts */
+	psc_ops->cw_disable_ints(port);
+
+	/* Wait the TX buffer to be empty */
+	j = 5000000;	/* Maximum wait */
+	while (!mpc52xx_uart_tx_empty(port) && --j)
+		udelay(1);
+
+	/* Write all the chars */
+	for (i = 0; i < count; i++, s++) {
+		/* Line return handling */
+		if (*s == '\n')
+			psc_ops->write_char(port, '\r');
+
+		/* Send the char */
+		psc_ops->write_char(port, *s);
+
+		/* Wait the TX buffer to be empty */
+		j = 20000;	/* Maximum wait */
+		while (!mpc52xx_uart_tx_empty(port) && --j)
+			udelay(1);
+	}
+
+	/* Restore interrupt state */
+	psc_ops->cw_restore_ints(port);
+}
+
+
+static int __init
+mpc52xx_console_setup(struct console *co, char *options)
+{
+	struct uart_port *port = &mpc52xx_uart_ports[co->index];
+	struct device_node *np = mpc52xx_uart_nodes[co->index];
+	unsigned int uartclk;
+	struct resource res;
+	int ret;
+
+	int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
+		 co, co->index, options);
+
+	if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
+		pr_debug("PSC%x out of range\n", co->index);
+		return -EINVAL;
+	}
+
+	if (!np) {
+		pr_debug("PSC%x not found in device tree\n", co->index);
+		return -EINVAL;
+	}
+
+	pr_debug("Console on ttyPSC%x is %pOF\n",
+		 co->index, mpc52xx_uart_nodes[co->index]);
+
+	/* Fetch register locations */
+	ret = of_address_to_resource(np, 0, &res);
+	if (ret) {
+		pr_debug("Could not get resources for PSC%x\n", co->index);
+		return ret;
+	}
+
+	uartclk = mpc5xxx_fwnode_get_bus_frequency(of_fwnode_handle(np));
+	if (uartclk == 0) {
+		pr_debug("Could not find uart clock frequency!\n");
+		return -EINVAL;
+	}
+
+	/* Basic port init. Needed since we use some uart_??? func before
+	 * real init for early access */
+	spin_lock_init(&port->lock);
+	port->uartclk = uartclk;
+	port->ops	= &mpc52xx_uart_ops;
+	port->mapbase = res.start;
+	port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
+	port->irq = irq_of_parse_and_map(np, 0);
+
+	if (port->membase == NULL)
+		return -EINVAL;
+
+	pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
+		 (void *)port->mapbase, port->membase,
+		 port->irq, port->uartclk);
+
+	/* Setup the port parameters accoding to options */
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+	else
+		mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
+
+	pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
+		 baud, bits, parity, flow);
+
+	return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+
+static struct uart_driver mpc52xx_uart_driver;
+
+static struct console mpc52xx_console = {
+	.name	= "ttyPSC",
+	.write	= mpc52xx_console_write,
+	.device	= uart_console_device,
+	.setup	= mpc52xx_console_setup,
+	.flags	= CON_PRINTBUFFER,
+	.index	= -1,	/* Specified on the cmdline (e.g. console=ttyPSC0) */
+	.data	= &mpc52xx_uart_driver,
+};
+
+
+static int __init
+mpc52xx_console_init(void)
+{
+	mpc52xx_uart_of_enumerate();
+	register_console(&mpc52xx_console);
+	return 0;
+}
+
+console_initcall(mpc52xx_console_init);
+
+#define MPC52xx_PSC_CONSOLE &mpc52xx_console
+#else
+#define MPC52xx_PSC_CONSOLE NULL
+#endif
+
+
+/* ======================================================================== */
+/* UART Driver                                                              */
+/* ======================================================================== */
+
+static struct uart_driver mpc52xx_uart_driver = {
+	.driver_name	= "mpc52xx_psc_uart",
+	.dev_name	= "ttyPSC",
+	.major		= SERIAL_PSC_MAJOR,
+	.minor		= SERIAL_PSC_MINOR,
+	.nr		= MPC52xx_PSC_MAXNUM,
+	.cons		= MPC52xx_PSC_CONSOLE,
+};
+
+/* ======================================================================== */
+/* OF Platform Driver                                                       */
+/* ======================================================================== */
+
+static const struct of_device_id mpc52xx_uart_of_match[] = {
+#ifdef CONFIG_PPC_MPC52xx
+	{ .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
+	{ .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
+	/* binding used by old lite5200 device trees: */
+	{ .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
+	/* binding used by efika: */
+	{ .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
+#endif
+#ifdef CONFIG_PPC_MPC512x
+	{ .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
+	{ .compatible = "fsl,mpc5125-psc-uart", .data = &mpc5125_psc_ops, },
+#endif
+	{},
+};
+
+static int mpc52xx_uart_of_probe(struct platform_device *op)
+{
+	int idx = -1;
+	unsigned int uartclk;
+	struct uart_port *port = NULL;
+	struct resource res;
+	int ret;
+
+	/* Check validity & presence */
+	for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
+		if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
+			break;
+	if (idx >= MPC52xx_PSC_MAXNUM)
+		return -EINVAL;
+	pr_debug("Found %pOF assigned to ttyPSC%x\n",
+		 mpc52xx_uart_nodes[idx], idx);
+
+	/* set the uart clock to the input clock of the psc, the different
+	 * prescalers are taken into account in the set_baudrate() methods
+	 * of the respective chip */
+	uartclk = mpc5xxx_get_bus_frequency(&op->dev);
+	if (uartclk == 0) {
+		dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
+		return -EINVAL;
+	}
+
+	/* Init the port structure */
+	port = &mpc52xx_uart_ports[idx];
+
+	spin_lock_init(&port->lock);
+	port->uartclk = uartclk;
+	port->fifosize	= 512;
+	port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MPC52xx_CONSOLE);
+	port->iotype	= UPIO_MEM;
+	port->flags	= UPF_BOOT_AUTOCONF |
+			  (uart_console(port) ? 0 : UPF_IOREMAP);
+	port->line	= idx;
+	port->ops	= &mpc52xx_uart_ops;
+	port->dev	= &op->dev;
+
+	/* Search for IRQ and mapbase */
+	ret = of_address_to_resource(op->dev.of_node, 0, &res);
+	if (ret)
+		return ret;
+
+	port->mapbase = res.start;
+	if (!port->mapbase) {
+		dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
+		return -EINVAL;
+	}
+
+	psc_ops->get_irq(port, op->dev.of_node);
+	if (port->irq == 0) {
+		dev_dbg(&op->dev, "Could not get irq\n");
+		return -EINVAL;
+	}
+
+	dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
+		(void *)port->mapbase, port->irq, port->uartclk);
+
+	/* Add the port to the uart sub-system */
+	ret = uart_add_one_port(&mpc52xx_uart_driver, port);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(op, (void *)port);
+	return 0;
+}
+
+static int
+mpc52xx_uart_of_remove(struct platform_device *op)
+{
+	struct uart_port *port = platform_get_drvdata(op);
+
+	if (port)
+		uart_remove_one_port(&mpc52xx_uart_driver, port);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int
+mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
+{
+	struct uart_port *port = platform_get_drvdata(op);
+
+	if (port)
+		uart_suspend_port(&mpc52xx_uart_driver, port);
+
+	return 0;
+}
+
+static int
+mpc52xx_uart_of_resume(struct platform_device *op)
+{
+	struct uart_port *port = platform_get_drvdata(op);
+
+	if (port)
+		uart_resume_port(&mpc52xx_uart_driver, port);
+
+	return 0;
+}
+#endif
+
+static void
+mpc52xx_uart_of_assign(struct device_node *np)
+{
+	int i;
+
+	/* Find the first free PSC number */
+	for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
+		if (mpc52xx_uart_nodes[i] == NULL) {
+			of_node_get(np);
+			mpc52xx_uart_nodes[i] = np;
+			return;
+		}
+	}
+}
+
+static void
+mpc52xx_uart_of_enumerate(void)
+{
+	static int enum_done;
+	struct device_node *np;
+	const struct  of_device_id *match;
+	int i;
+
+	if (enum_done)
+		return;
+
+	/* Assign index to each PSC in device tree */
+	for_each_matching_node(np, mpc52xx_uart_of_match) {
+		match = of_match_node(mpc52xx_uart_of_match, np);
+		psc_ops = match->data;
+		mpc52xx_uart_of_assign(np);
+	}
+
+	enum_done = 1;
+
+	for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
+		if (mpc52xx_uart_nodes[i])
+			pr_debug("%pOF assigned to ttyPSC%x\n",
+				 mpc52xx_uart_nodes[i], i);
+	}
+}
+
+MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
+
+static struct platform_driver mpc52xx_uart_of_driver = {
+	.probe		= mpc52xx_uart_of_probe,
+	.remove		= mpc52xx_uart_of_remove,
+#ifdef CONFIG_PM
+	.suspend	= mpc52xx_uart_of_suspend,
+	.resume		= mpc52xx_uart_of_resume,
+#endif
+	.driver = {
+		.name = "mpc52xx-psc-uart",
+		.of_match_table = mpc52xx_uart_of_match,
+	},
+};
+
+
+/* ======================================================================== */
+/* Module                                                                   */
+/* ======================================================================== */
+
+static int __init
+mpc52xx_uart_init(void)
+{
+	int ret;
+
+	printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
+
+	ret = uart_register_driver(&mpc52xx_uart_driver);
+	if (ret) {
+		printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
+		       __FILE__, ret);
+		return ret;
+	}
+
+	mpc52xx_uart_of_enumerate();
+
+	/*
+	 * Map the PSC FIFO Controller and init if on MPC512x.
+	 */
+	if (psc_ops && psc_ops->fifoc_init) {
+		ret = psc_ops->fifoc_init();
+		if (ret)
+			goto err_init;
+	}
+
+	ret = platform_driver_register(&mpc52xx_uart_of_driver);
+	if (ret) {
+		printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
+		       __FILE__, ret);
+		goto err_reg;
+	}
+
+	return 0;
+err_reg:
+	if (psc_ops && psc_ops->fifoc_uninit)
+		psc_ops->fifoc_uninit();
+err_init:
+	uart_unregister_driver(&mpc52xx_uart_driver);
+	return ret;
+}
+
+static void __exit
+mpc52xx_uart_exit(void)
+{
+	if (psc_ops->fifoc_uninit)
+		psc_ops->fifoc_uninit();
+
+	platform_driver_unregister(&mpc52xx_uart_of_driver);
+	uart_unregister_driver(&mpc52xx_uart_driver);
+}
+
+
+module_init(mpc52xx_uart_init);
+module_exit(mpc52xx_uart_exit);
+
+MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
+MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
+MODULE_LICENSE("GPL");