Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 1632 insertions, 0 deletions

diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
new file mode 100644
index 000000000..319e5ceb6
--- /dev/null
+++ b/drivers/tty/serial/sunsu.c
@@ -0,0 +1,1632 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ * Copyright (C) 1998-1999  Pete Zaitcev   (zaitcev@yahoo.com)
+ *
+ * This is mainly a variation of 8250.c, credits go to authors mentioned
+ * therein.  In fact this driver should be merged into the generic 8250.c
+ * infrastructure perhaps using a 8250_sparc.c module.
+ *
+ * Fixed to use tty_get_baud_rate().
+ *   Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
+ *
+ * Converted to new 2.5.x UART layer.
+ *   David S. Miller (davem@davemloft.net), 2002-Jul-29
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/slab.h>
+#ifdef CONFIG_SERIO
+#include <linux/serio.h>
+#endif
+#include <linux/serial_reg.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/of_device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/prom.h>
+#include <asm/setup.h>
+
+#include <linux/serial_core.h>
+#include <linux/sunserialcore.h>
+
+/* We are on a NS PC87303 clocked with 24.0 MHz, which results
+ * in a UART clock of 1.8462 MHz.
+ */
+#define SU_BASE_BAUD	(1846200 / 16)
+
+enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
+static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };
+
+struct serial_uart_config {
+	char	*name;
+	int	dfl_xmit_fifo_size;
+	int	flags;
+};
+
+/*
+ * Here we define the default xmit fifo size used for each type of UART.
+ */
+static const struct serial_uart_config uart_config[] = {
+	{ "unknown",	1,	0 },
+	{ "8250",	1,	0 },
+	{ "16450",	1,	0 },
+	{ "16550",	1,	0 },
+	{ "16550A",	16,	UART_CLEAR_FIFO | UART_USE_FIFO },
+	{ "Cirrus",	1, 	0 },
+	{ "ST16650",	1,	UART_CLEAR_FIFO | UART_STARTECH },
+	{ "ST16650V2",	32,	UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
+	{ "TI16750",	64,	UART_CLEAR_FIFO | UART_USE_FIFO },
+	{ "Startech",	1,	0 },
+	{ "16C950/954",	128,	UART_CLEAR_FIFO | UART_USE_FIFO },
+	{ "ST16654",	64,	UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
+	{ "XR16850",	128,	UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
+	{ "RSA",	2048,	UART_CLEAR_FIFO | UART_USE_FIFO }
+};
+
+struct uart_sunsu_port {
+	struct uart_port	port;
+	unsigned char		acr;
+	unsigned char		ier;
+	unsigned short		rev;
+	unsigned char		lcr;
+	unsigned int		lsr_break_flag;
+	unsigned int		cflag;
+
+	/* Probing information.  */
+	enum su_type		su_type;
+	unsigned int		type_probed;	/* XXX Stupid */
+	unsigned long		reg_size;
+
+#ifdef CONFIG_SERIO
+	struct serio		serio;
+	int			serio_open;
+#endif
+};
+
+static unsigned int serial_in(struct uart_sunsu_port *up, int offset)
+{
+	offset <<= up->port.regshift;
+
+	switch (up->port.iotype) {
+	case UPIO_HUB6:
+		outb(up->port.hub6 - 1 + offset, up->port.iobase);
+		return inb(up->port.iobase + 1);
+
+	case UPIO_MEM:
+		return readb(up->port.membase + offset);
+
+	default:
+		return inb(up->port.iobase + offset);
+	}
+}
+
+static void serial_out(struct uart_sunsu_port *up, int offset, int value)
+{
+#ifndef CONFIG_SPARC64
+	/*
+	 * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
+	 * connected with a gate then go to SlavIO. When IRQ4 goes tristated
+	 * gate outputs a logical one. Since we use level triggered interrupts
+	 * we have lockup and watchdog reset. We cannot mask IRQ because
+	 * keyboard shares IRQ with us (Word has it as Bob Smelik's design).
+	 * This problem is similar to what Alpha people suffer, see serial.c.
+	 */
+	if (offset == UART_MCR)
+		value |= UART_MCR_OUT2;
+#endif
+	offset <<= up->port.regshift;
+
+	switch (up->port.iotype) {
+	case UPIO_HUB6:
+		outb(up->port.hub6 - 1 + offset, up->port.iobase);
+		outb(value, up->port.iobase + 1);
+		break;
+
+	case UPIO_MEM:
+		writeb(value, up->port.membase + offset);
+		break;
+
+	default:
+		outb(value, up->port.iobase + offset);
+	}
+}
+
+/*
+ * We used to support using pause I/O for certain machines.  We
+ * haven't supported this for a while, but just in case it's badly
+ * needed for certain old 386 machines, I've left these #define's
+ * in....
+ */
+#define serial_inp(up, offset)		serial_in(up, offset)
+#define serial_outp(up, offset, value)	serial_out(up, offset, value)
+
+
+/*
+ * For the 16C950
+ */
+static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
+{
+	serial_out(up, UART_SCR, offset);
+	serial_out(up, UART_ICR, value);
+}
+
+#if 0 /* Unused currently */
+static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
+{
+	unsigned int value;
+
+	serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
+	serial_out(up, UART_SCR, offset);
+	value = serial_in(up, UART_ICR);
+	serial_icr_write(up, UART_ACR, up->acr);
+
+	return value;
+}
+#endif
+
+#ifdef CONFIG_SERIAL_8250_RSA
+/*
+ * Attempts to turn on the RSA FIFO.  Returns zero on failure.
+ * We set the port uart clock rate if we succeed.
+ */
+static int __enable_rsa(struct uart_sunsu_port *up)
+{
+	unsigned char mode;
+	int result;
+
+	mode = serial_inp(up, UART_RSA_MSR);
+	result = mode & UART_RSA_MSR_FIFO;
+
+	if (!result) {
+		serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
+		mode = serial_inp(up, UART_RSA_MSR);
+		result = mode & UART_RSA_MSR_FIFO;
+	}
+
+	if (result)
+		up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
+
+	return result;
+}
+
+static void enable_rsa(struct uart_sunsu_port *up)
+{
+	if (up->port.type == PORT_RSA) {
+		if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
+			spin_lock_irq(&up->port.lock);
+			__enable_rsa(up);
+			spin_unlock_irq(&up->port.lock);
+		}
+		if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
+			serial_outp(up, UART_RSA_FRR, 0);
+	}
+}
+
+/*
+ * Attempts to turn off the RSA FIFO.  Returns zero on failure.
+ * It is unknown why interrupts were disabled in here.  However,
+ * the caller is expected to preserve this behaviour by grabbing
+ * the spinlock before calling this function.
+ */
+static void disable_rsa(struct uart_sunsu_port *up)
+{
+	unsigned char mode;
+	int result;
+
+	if (up->port.type == PORT_RSA &&
+	    up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
+		spin_lock_irq(&up->port.lock);
+
+		mode = serial_inp(up, UART_RSA_MSR);
+		result = !(mode & UART_RSA_MSR_FIFO);
+
+		if (!result) {
+			serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
+			mode = serial_inp(up, UART_RSA_MSR);
+			result = !(mode & UART_RSA_MSR_FIFO);
+		}
+
+		if (result)
+			up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
+		spin_unlock_irq(&up->port.lock);
+	}
+}
+#endif /* CONFIG_SERIAL_8250_RSA */
+
+static inline void __stop_tx(struct uart_sunsu_port *p)
+{
+	if (p->ier & UART_IER_THRI) {
+		p->ier &= ~UART_IER_THRI;
+		serial_out(p, UART_IER, p->ier);
+	}
+}
+
+static void sunsu_stop_tx(struct uart_port *port)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+
+	__stop_tx(up);
+
+	/*
+	 * We really want to stop the transmitter from sending.
+	 */
+	if (up->port.type == PORT_16C950) {
+		up->acr |= UART_ACR_TXDIS;
+		serial_icr_write(up, UART_ACR, up->acr);
+	}
+}
+
+static void sunsu_start_tx(struct uart_port *port)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+
+	if (!(up->ier & UART_IER_THRI)) {
+		up->ier |= UART_IER_THRI;
+		serial_out(up, UART_IER, up->ier);
+	}
+
+	/*
+	 * Re-enable the transmitter if we disabled it.
+	 */
+	if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
+		up->acr &= ~UART_ACR_TXDIS;
+		serial_icr_write(up, UART_ACR, up->acr);
+	}
+}
+
+static void sunsu_stop_rx(struct uart_port *port)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+
+	up->ier &= ~UART_IER_RLSI;
+	up->port.read_status_mask &= ~UART_LSR_DR;
+	serial_out(up, UART_IER, up->ier);
+}
+
+static void sunsu_enable_ms(struct uart_port *port)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+	unsigned long flags;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	up->ier |= UART_IER_MSI;
+	serial_out(up, UART_IER, up->ier);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+receive_chars(struct uart_sunsu_port *up, unsigned char *status)
+{
+	struct tty_port *port = &up->port.state->port;
+	unsigned char ch, flag;
+	int max_count = 256;
+	int saw_console_brk = 0;
+
+	do {
+		ch = serial_inp(up, UART_RX);
+		flag = TTY_NORMAL;
+		up->port.icount.rx++;
+
+		if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+				       UART_LSR_FE | UART_LSR_OE))) {
+			/*
+			 * For statistics only
+			 */
+			if (*status & UART_LSR_BI) {
+				*status &= ~(UART_LSR_FE | UART_LSR_PE);
+				up->port.icount.brk++;
+				if (up->port.cons != NULL &&
+				    up->port.line == up->port.cons->index)
+					saw_console_brk = 1;
+				/*
+				 * We do the SysRQ and SAK checking
+				 * here because otherwise the break
+				 * may get masked by ignore_status_mask
+				 * or read_status_mask.
+				 */
+				if (uart_handle_break(&up->port))
+					goto ignore_char;
+			} else if (*status & UART_LSR_PE)
+				up->port.icount.parity++;
+			else if (*status & UART_LSR_FE)
+				up->port.icount.frame++;
+			if (*status & UART_LSR_OE)
+				up->port.icount.overrun++;
+
+			/*
+			 * Mask off conditions which should be ingored.
+			 */
+			*status &= up->port.read_status_mask;
+
+			if (up->port.cons != NULL &&
+			    up->port.line == up->port.cons->index) {
+				/* Recover the break flag from console xmit */
+				*status |= up->lsr_break_flag;
+				up->lsr_break_flag = 0;
+			}
+
+			if (*status & UART_LSR_BI) {
+				flag = TTY_BREAK;
+			} else if (*status & UART_LSR_PE)
+				flag = TTY_PARITY;
+			else if (*status & UART_LSR_FE)
+				flag = TTY_FRAME;
+		}
+		if (uart_handle_sysrq_char(&up->port, ch))
+			goto ignore_char;
+		if ((*status & up->port.ignore_status_mask) == 0)
+			tty_insert_flip_char(port, ch, flag);
+		if (*status & UART_LSR_OE)
+			/*
+			 * Overrun is special, since it's reported
+			 * immediately, and doesn't affect the current
+			 * character.
+			 */
+			 tty_insert_flip_char(port, 0, TTY_OVERRUN);
+	ignore_char:
+		*status = serial_inp(up, UART_LSR);
+	} while ((*status & UART_LSR_DR) && (max_count-- > 0));
+
+	if (saw_console_brk)
+		sun_do_break();
+}
+
+static void transmit_chars(struct uart_sunsu_port *up)
+{
+	struct circ_buf *xmit = &up->port.state->xmit;
+	int count;
+
+	if (up->port.x_char) {
+		serial_outp(up, UART_TX, up->port.x_char);
+		up->port.icount.tx++;
+		up->port.x_char = 0;
+		return;
+	}
+	if (uart_tx_stopped(&up->port)) {
+		sunsu_stop_tx(&up->port);
+		return;
+	}
+	if (uart_circ_empty(xmit)) {
+		__stop_tx(up);
+		return;
+	}
+
+	count = up->port.fifosize;
+	do {
+		serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		up->port.icount.tx++;
+		if (uart_circ_empty(xmit))
+			break;
+	} while (--count > 0);
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&up->port);
+
+	if (uart_circ_empty(xmit))
+		__stop_tx(up);
+}
+
+static void check_modem_status(struct uart_sunsu_port *up)
+{
+	int status;
+
+	status = serial_in(up, UART_MSR);
+
+	if ((status & UART_MSR_ANY_DELTA) == 0)
+		return;
+
+	if (status & UART_MSR_TERI)
+		up->port.icount.rng++;
+	if (status & UART_MSR_DDSR)
+		up->port.icount.dsr++;
+	if (status & UART_MSR_DDCD)
+		uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
+	if (status & UART_MSR_DCTS)
+		uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
+
+	wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+}
+
+static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
+{
+	struct uart_sunsu_port *up = dev_id;
+	unsigned long flags;
+	unsigned char status;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	do {
+		status = serial_inp(up, UART_LSR);
+		if (status & UART_LSR_DR)
+			receive_chars(up, &status);
+		check_modem_status(up);
+		if (status & UART_LSR_THRE)
+			transmit_chars(up);
+
+		spin_unlock_irqrestore(&up->port.lock, flags);
+
+		tty_flip_buffer_push(&up->port.state->port);
+
+		spin_lock_irqsave(&up->port.lock, flags);
+
+	} while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+/* Separate interrupt handling path for keyboard/mouse ports.  */
+
+static void
+sunsu_change_speed(struct uart_port *port, unsigned int cflag,
+		   unsigned int iflag, unsigned int quot);
+
+static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
+{
+	unsigned int cur_cflag = up->cflag;
+	int quot, new_baud;
+
+	up->cflag &= ~CBAUD;
+	up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
+
+	quot = up->port.uartclk / (16 * new_baud);
+
+	sunsu_change_speed(&up->port, up->cflag, 0, quot);
+}
+
+static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break)
+{
+	do {
+		unsigned char ch = serial_inp(up, UART_RX);
+
+		/* Stop-A is handled by drivers/char/keyboard.c now. */
+		if (up->su_type == SU_PORT_KBD) {
+#ifdef CONFIG_SERIO
+			serio_interrupt(&up->serio, ch, 0);
+#endif
+		} else if (up->su_type == SU_PORT_MS) {
+			int ret = suncore_mouse_baud_detection(ch, is_break);
+
+			switch (ret) {
+			case 2:
+				sunsu_change_mouse_baud(up);
+				fallthrough;
+			case 1:
+				break;
+
+			case 0:
+#ifdef CONFIG_SERIO
+				serio_interrupt(&up->serio, ch, 0);
+#endif
+				break;
+			}
+		}
+	} while (serial_in(up, UART_LSR) & UART_LSR_DR);
+}
+
+static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id)
+{
+	struct uart_sunsu_port *up = dev_id;
+
+	if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
+		unsigned char status = serial_inp(up, UART_LSR);
+
+		if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
+			receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static unsigned int sunsu_tx_empty(struct uart_port *port)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+	unsigned long flags;
+	unsigned int ret;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	return ret;
+}
+
+static unsigned int sunsu_get_mctrl(struct uart_port *port)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+	unsigned char status;
+	unsigned int ret;
+
+	status = serial_in(up, UART_MSR);
+
+	ret = 0;
+	if (status & UART_MSR_DCD)
+		ret |= TIOCM_CAR;
+	if (status & UART_MSR_RI)
+		ret |= TIOCM_RNG;
+	if (status & UART_MSR_DSR)
+		ret |= TIOCM_DSR;
+	if (status & UART_MSR_CTS)
+		ret |= TIOCM_CTS;
+	return ret;
+}
+
+static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+	unsigned char mcr = 0;
+
+	if (mctrl & TIOCM_RTS)
+		mcr |= UART_MCR_RTS;
+	if (mctrl & TIOCM_DTR)
+		mcr |= UART_MCR_DTR;
+	if (mctrl & TIOCM_OUT1)
+		mcr |= UART_MCR_OUT1;
+	if (mctrl & TIOCM_OUT2)
+		mcr |= UART_MCR_OUT2;
+	if (mctrl & TIOCM_LOOP)
+		mcr |= UART_MCR_LOOP;
+
+	serial_out(up, UART_MCR, mcr);
+}
+
+static void sunsu_break_ctl(struct uart_port *port, int break_state)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+	unsigned long flags;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	if (break_state == -1)
+		up->lcr |= UART_LCR_SBC;
+	else
+		up->lcr &= ~UART_LCR_SBC;
+	serial_out(up, UART_LCR, up->lcr);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static int sunsu_startup(struct uart_port *port)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+	unsigned long flags;
+	int retval;
+
+	if (up->port.type == PORT_16C950) {
+		/* Wake up and initialize UART */
+		up->acr = 0;
+		serial_outp(up, UART_LCR, 0xBF);
+		serial_outp(up, UART_EFR, UART_EFR_ECB);
+		serial_outp(up, UART_IER, 0);
+		serial_outp(up, UART_LCR, 0);
+		serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
+		serial_outp(up, UART_LCR, 0xBF);
+		serial_outp(up, UART_EFR, UART_EFR_ECB);
+		serial_outp(up, UART_LCR, 0);
+	}
+
+#ifdef CONFIG_SERIAL_8250_RSA
+	/*
+	 * If this is an RSA port, see if we can kick it up to the
+	 * higher speed clock.
+	 */
+	enable_rsa(up);
+#endif
+
+	/*
+	 * Clear the FIFO buffers and disable them.
+	 * (they will be reenabled in set_termios())
+	 */
+	if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
+		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+				UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+		serial_outp(up, UART_FCR, 0);
+	}
+
+	/*
+	 * Clear the interrupt registers.
+	 */
+	(void) serial_inp(up, UART_LSR);
+	(void) serial_inp(up, UART_RX);
+	(void) serial_inp(up, UART_IIR);
+	(void) serial_inp(up, UART_MSR);
+
+	/*
+	 * At this point, there's no way the LSR could still be 0xff;
+	 * if it is, then bail out, because there's likely no UART
+	 * here.
+	 */
+	if (!(up->port.flags & UPF_BUGGY_UART) &&
+	    (serial_inp(up, UART_LSR) == 0xff)) {
+		printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
+		return -ENODEV;
+	}
+
+	if (up->su_type != SU_PORT_PORT) {
+		retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
+				     IRQF_SHARED, su_typev[up->su_type], up);
+	} else {
+		retval = request_irq(up->port.irq, sunsu_serial_interrupt,
+				     IRQF_SHARED, su_typev[up->su_type], up);
+	}
+	if (retval) {
+		printk("su: Cannot register IRQ %d\n", up->port.irq);
+		return retval;
+	}
+
+	/*
+	 * Now, initialize the UART
+	 */
+	serial_outp(up, UART_LCR, UART_LCR_WLEN8);
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	up->port.mctrl |= TIOCM_OUT2;
+
+	sunsu_set_mctrl(&up->port, up->port.mctrl);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	/*
+	 * Finally, enable interrupts.  Note: Modem status interrupts
+	 * are set via set_termios(), which will be occurring imminently
+	 * anyway, so we don't enable them here.
+	 */
+	up->ier = UART_IER_RLSI | UART_IER_RDI;
+	serial_outp(up, UART_IER, up->ier);
+
+	if (up->port.flags & UPF_FOURPORT) {
+		unsigned int icp;
+		/*
+		 * Enable interrupts on the AST Fourport board
+		 */
+		icp = (up->port.iobase & 0xfe0) | 0x01f;
+		outb_p(0x80, icp);
+		(void) inb_p(icp);
+	}
+
+	/*
+	 * And clear the interrupt registers again for luck.
+	 */
+	(void) serial_inp(up, UART_LSR);
+	(void) serial_inp(up, UART_RX);
+	(void) serial_inp(up, UART_IIR);
+	(void) serial_inp(up, UART_MSR);
+
+	return 0;
+}
+
+static void sunsu_shutdown(struct uart_port *port)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+	unsigned long flags;
+
+	/*
+	 * Disable interrupts from this port
+	 */
+	up->ier = 0;
+	serial_outp(up, UART_IER, 0);
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	if (up->port.flags & UPF_FOURPORT) {
+		/* reset interrupts on the AST Fourport board */
+		inb((up->port.iobase & 0xfe0) | 0x1f);
+		up->port.mctrl |= TIOCM_OUT1;
+	} else
+		up->port.mctrl &= ~TIOCM_OUT2;
+
+	sunsu_set_mctrl(&up->port, up->port.mctrl);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	/*
+	 * Disable break condition and FIFOs
+	 */
+	serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
+	serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+				  UART_FCR_CLEAR_RCVR |
+				  UART_FCR_CLEAR_XMIT);
+	serial_outp(up, UART_FCR, 0);
+
+#ifdef CONFIG_SERIAL_8250_RSA
+	/*
+	 * Reset the RSA board back to 115kbps compat mode.
+	 */
+	disable_rsa(up);
+#endif
+
+	/*
+	 * Read data port to reset things.
+	 */
+	(void) serial_in(up, UART_RX);
+
+	free_irq(up->port.irq, up);
+}
+
+static void
+sunsu_change_speed(struct uart_port *port, unsigned int cflag,
+		   unsigned int iflag, unsigned int quot)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+	unsigned char cval, fcr = 0;
+	unsigned long flags;
+
+	switch (cflag & CSIZE) {
+	case CS5:
+		cval = 0x00;
+		break;
+	case CS6:
+		cval = 0x01;
+		break;
+	case CS7:
+		cval = 0x02;
+		break;
+	default:
+	case CS8:
+		cval = 0x03;
+		break;
+	}
+
+	if (cflag & CSTOPB)
+		cval |= 0x04;
+	if (cflag & PARENB)
+		cval |= UART_LCR_PARITY;
+	if (!(cflag & PARODD))
+		cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+	if (cflag & CMSPAR)
+		cval |= UART_LCR_SPAR;
+#endif
+
+	/*
+	 * Work around a bug in the Oxford Semiconductor 952 rev B
+	 * chip which causes it to seriously miscalculate baud rates
+	 * when DLL is 0.
+	 */
+	if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
+	    up->rev == 0x5201)
+		quot ++;
+
+	if (uart_config[up->port.type].flags & UART_USE_FIFO) {
+		if ((up->port.uartclk / quot) < (2400 * 16))
+			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
+#ifdef CONFIG_SERIAL_8250_RSA
+		else if (up->port.type == PORT_RSA)
+			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
+#endif
+		else
+			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
+	}
+	if (up->port.type == PORT_16750)
+		fcr |= UART_FCR7_64BYTE;
+
+	/*
+	 * Ok, we're now changing the port state.  Do it with
+	 * interrupts disabled.
+	 */
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	/*
+	 * Update the per-port timeout.
+	 */
+	uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
+
+	up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+	if (iflag & INPCK)
+		up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+	if (iflag & (IGNBRK | BRKINT | PARMRK))
+		up->port.read_status_mask |= UART_LSR_BI;
+
+	/*
+	 * Characteres to ignore
+	 */
+	up->port.ignore_status_mask = 0;
+	if (iflag & IGNPAR)
+		up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+	if (iflag & IGNBRK) {
+		up->port.ignore_status_mask |= UART_LSR_BI;
+		/*
+		 * If we're ignoring parity and break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (iflag & IGNPAR)
+			up->port.ignore_status_mask |= UART_LSR_OE;
+	}
+
+	/*
+	 * ignore all characters if CREAD is not set
+	 */
+	if ((cflag & CREAD) == 0)
+		up->port.ignore_status_mask |= UART_LSR_DR;
+
+	/*
+	 * CTS flow control flag and modem status interrupts
+	 */
+	up->ier &= ~UART_IER_MSI;
+	if (UART_ENABLE_MS(&up->port, cflag))
+		up->ier |= UART_IER_MSI;
+
+	serial_out(up, UART_IER, up->ier);
+
+	if (uart_config[up->port.type].flags & UART_STARTECH) {
+		serial_outp(up, UART_LCR, 0xBF);
+		serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
+	}
+	serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
+	serial_outp(up, UART_DLL, quot & 0xff);		/* LS of divisor */
+	serial_outp(up, UART_DLM, quot >> 8);		/* MS of divisor */
+	if (up->port.type == PORT_16750)
+		serial_outp(up, UART_FCR, fcr);		/* set fcr */
+	serial_outp(up, UART_LCR, cval);		/* reset DLAB */
+	up->lcr = cval;					/* Save LCR */
+	if (up->port.type != PORT_16750) {
+		if (fcr & UART_FCR_ENABLE_FIFO) {
+			/* emulated UARTs (Lucent Venus 167x) need two steps */
+			serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+		}
+		serial_outp(up, UART_FCR, fcr);		/* set fcr */
+	}
+
+	up->cflag = cflag;
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+sunsu_set_termios(struct uart_port *port, struct ktermios *termios,
+		  struct ktermios *old)
+{
+	unsigned int baud, quot;
+
+	/*
+	 * Ask the core to calculate the divisor for us.
+	 */
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = uart_get_divisor(port, baud);
+
+	sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
+}
+
+static void sunsu_release_port(struct uart_port *port)
+{
+}
+
+static int sunsu_request_port(struct uart_port *port)
+{
+	return 0;
+}
+
+static void sunsu_config_port(struct uart_port *port, int flags)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+
+	if (flags & UART_CONFIG_TYPE) {
+		/*
+		 * We are supposed to call autoconfig here, but this requires
+		 * splitting all the OBP probing crap from the UART probing.
+		 * We'll do it when we kill sunsu.c altogether.
+		 */
+		port->type = up->type_probed;	/* XXX */
+	}
+}
+
+static int
+sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	return -EINVAL;
+}
+
+static const char *
+sunsu_type(struct uart_port *port)
+{
+	int type = port->type;
+
+	if (type >= ARRAY_SIZE(uart_config))
+		type = 0;
+	return uart_config[type].name;
+}
+
+static const struct uart_ops sunsu_pops = {
+	.tx_empty	= sunsu_tx_empty,
+	.set_mctrl	= sunsu_set_mctrl,
+	.get_mctrl	= sunsu_get_mctrl,
+	.stop_tx	= sunsu_stop_tx,
+	.start_tx	= sunsu_start_tx,
+	.stop_rx	= sunsu_stop_rx,
+	.enable_ms	= sunsu_enable_ms,
+	.break_ctl	= sunsu_break_ctl,
+	.startup	= sunsu_startup,
+	.shutdown	= sunsu_shutdown,
+	.set_termios	= sunsu_set_termios,
+	.type		= sunsu_type,
+	.release_port	= sunsu_release_port,
+	.request_port	= sunsu_request_port,
+	.config_port	= sunsu_config_port,
+	.verify_port	= sunsu_verify_port,
+};
+
+#define UART_NR	4
+
+static struct uart_sunsu_port sunsu_ports[UART_NR];
+static int nr_inst; /* Number of already registered ports */
+
+#ifdef CONFIG_SERIO
+
+static DEFINE_SPINLOCK(sunsu_serio_lock);
+
+static int sunsu_serio_write(struct serio *serio, unsigned char ch)
+{
+	struct uart_sunsu_port *up = serio->port_data;
+	unsigned long flags;
+	int lsr;
+
+	spin_lock_irqsave(&sunsu_serio_lock, flags);
+
+	do {
+		lsr = serial_in(up, UART_LSR);
+	} while (!(lsr & UART_LSR_THRE));
+
+	/* Send the character out. */
+	serial_out(up, UART_TX, ch);
+
+	spin_unlock_irqrestore(&sunsu_serio_lock, flags);
+
+	return 0;
+}
+
+static int sunsu_serio_open(struct serio *serio)
+{
+	struct uart_sunsu_port *up = serio->port_data;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&sunsu_serio_lock, flags);
+	if (!up->serio_open) {
+		up->serio_open = 1;
+		ret = 0;
+	} else
+		ret = -EBUSY;
+	spin_unlock_irqrestore(&sunsu_serio_lock, flags);
+
+	return ret;
+}
+
+static void sunsu_serio_close(struct serio *serio)
+{
+	struct uart_sunsu_port *up = serio->port_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sunsu_serio_lock, flags);
+	up->serio_open = 0;
+	spin_unlock_irqrestore(&sunsu_serio_lock, flags);
+}
+
+#endif /* CONFIG_SERIO */
+
+static void sunsu_autoconfig(struct uart_sunsu_port *up)
+{
+	unsigned char status1, status2, scratch, scratch2, scratch3;
+	unsigned char save_lcr, save_mcr;
+	unsigned long flags;
+
+	if (up->su_type == SU_PORT_NONE)
+		return;
+
+	up->type_probed = PORT_UNKNOWN;
+	up->port.iotype = UPIO_MEM;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	if (!(up->port.flags & UPF_BUGGY_UART)) {
+		/*
+		 * Do a simple existence test first; if we fail this, there's
+		 * no point trying anything else.
+		 *
+		 * 0x80 is used as a nonsense port to prevent against false
+		 * positives due to ISA bus float.  The assumption is that
+		 * 0x80 is a non-existent port; which should be safe since
+		 * include/asm/io.h also makes this assumption.
+		 */
+		scratch = serial_inp(up, UART_IER);
+		serial_outp(up, UART_IER, 0);
+#ifdef __i386__
+		outb(0xff, 0x080);
+#endif
+		scratch2 = serial_inp(up, UART_IER);
+		serial_outp(up, UART_IER, 0x0f);
+#ifdef __i386__
+		outb(0, 0x080);
+#endif
+		scratch3 = serial_inp(up, UART_IER);
+		serial_outp(up, UART_IER, scratch);
+		if (scratch2 != 0 || scratch3 != 0x0F)
+			goto out;	/* We failed; there's nothing here */
+	}
+
+	save_mcr = serial_in(up, UART_MCR);
+	save_lcr = serial_in(up, UART_LCR);
+
+	/* 
+	 * Check to see if a UART is really there.  Certain broken
+	 * internal modems based on the Rockwell chipset fail this
+	 * test, because they apparently don't implement the loopback
+	 * test mode.  So this test is skipped on the COM 1 through
+	 * COM 4 ports.  This *should* be safe, since no board
+	 * manufacturer would be stupid enough to design a board
+	 * that conflicts with COM 1-4 --- we hope!
+	 */
+	if (!(up->port.flags & UPF_SKIP_TEST)) {
+		serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
+		status1 = serial_inp(up, UART_MSR) & 0xF0;
+		serial_outp(up, UART_MCR, save_mcr);
+		if (status1 != 0x90)
+			goto out;	/* We failed loopback test */
+	}
+	serial_outp(up, UART_LCR, 0xBF);	/* set up for StarTech test */
+	serial_outp(up, UART_EFR, 0);		/* EFR is the same as FCR */
+	serial_outp(up, UART_LCR, 0);
+	serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+	scratch = serial_in(up, UART_IIR) >> 6;
+	switch (scratch) {
+		case 0:
+			up->port.type = PORT_16450;
+			break;
+		case 1:
+			up->port.type = PORT_UNKNOWN;
+			break;
+		case 2:
+			up->port.type = PORT_16550;
+			break;
+		case 3:
+			up->port.type = PORT_16550A;
+			break;
+	}
+	if (up->port.type == PORT_16550A) {
+		/* Check for Startech UART's */
+		serial_outp(up, UART_LCR, UART_LCR_DLAB);
+		if (serial_in(up, UART_EFR) == 0) {
+			up->port.type = PORT_16650;
+		} else {
+			serial_outp(up, UART_LCR, 0xBF);
+			if (serial_in(up, UART_EFR) == 0)
+				up->port.type = PORT_16650V2;
+		}
+	}
+	if (up->port.type == PORT_16550A) {
+		/* Check for TI 16750 */
+		serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
+		serial_outp(up, UART_FCR,
+			    UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
+		scratch = serial_in(up, UART_IIR) >> 5;
+		if (scratch == 7) {
+			/*
+			 * If this is a 16750, and not a cheap UART
+			 * clone, then it should only go into 64 byte
+			 * mode if the UART_FCR7_64BYTE bit was set
+			 * while UART_LCR_DLAB was latched.
+			 */
+ 			serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+			serial_outp(up, UART_LCR, 0);
+			serial_outp(up, UART_FCR,
+				    UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
+			scratch = serial_in(up, UART_IIR) >> 5;
+			if (scratch == 6)
+				up->port.type = PORT_16750;
+		}
+		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+	}
+	serial_outp(up, UART_LCR, save_lcr);
+	if (up->port.type == PORT_16450) {
+		scratch = serial_in(up, UART_SCR);
+		serial_outp(up, UART_SCR, 0xa5);
+		status1 = serial_in(up, UART_SCR);
+		serial_outp(up, UART_SCR, 0x5a);
+		status2 = serial_in(up, UART_SCR);
+		serial_outp(up, UART_SCR, scratch);
+
+		if ((status1 != 0xa5) || (status2 != 0x5a))
+			up->port.type = PORT_8250;
+	}
+
+	up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
+
+	if (up->port.type == PORT_UNKNOWN)
+		goto out;
+	up->type_probed = up->port.type;	/* XXX */
+
+	/*
+	 * Reset the UART.
+	 */
+#ifdef CONFIG_SERIAL_8250_RSA
+	if (up->port.type == PORT_RSA)
+		serial_outp(up, UART_RSA_FRR, 0);
+#endif
+	serial_outp(up, UART_MCR, save_mcr);
+	serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
+				     UART_FCR_CLEAR_RCVR |
+				     UART_FCR_CLEAR_XMIT));
+	serial_outp(up, UART_FCR, 0);
+	(void)serial_in(up, UART_RX);
+	serial_outp(up, UART_IER, 0);
+
+out:
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static struct uart_driver sunsu_reg = {
+	.owner			= THIS_MODULE,
+	.driver_name		= "sunsu",
+	.dev_name		= "ttyS",
+	.major			= TTY_MAJOR,
+};
+
+static int sunsu_kbd_ms_init(struct uart_sunsu_port *up)
+{
+	int quot, baud;
+#ifdef CONFIG_SERIO
+	struct serio *serio;
+#endif
+
+	if (up->su_type == SU_PORT_KBD) {
+		up->cflag = B1200 | CS8 | CLOCAL | CREAD;
+		baud = 1200;
+	} else {
+		up->cflag = B4800 | CS8 | CLOCAL | CREAD;
+		baud = 4800;
+	}
+	quot = up->port.uartclk / (16 * baud);
+
+	sunsu_autoconfig(up);
+	if (up->port.type == PORT_UNKNOWN)
+		return -ENODEV;
+
+	printk("%pOF: %s port at %llx, irq %u\n",
+	       up->port.dev->of_node,
+	       (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
+	       (unsigned long long) up->port.mapbase,
+	       up->port.irq);
+
+#ifdef CONFIG_SERIO
+	serio = &up->serio;
+	serio->port_data = up;
+
+	serio->id.type = SERIO_RS232;
+	if (up->su_type == SU_PORT_KBD) {
+		serio->id.proto = SERIO_SUNKBD;
+		strlcpy(serio->name, "sukbd", sizeof(serio->name));
+	} else {
+		serio->id.proto = SERIO_SUN;
+		serio->id.extra = 1;
+		strlcpy(serio->name, "sums", sizeof(serio->name));
+	}
+	strlcpy(serio->phys,
+		(!(up->port.line & 1) ? "su/serio0" : "su/serio1"),
+		sizeof(serio->phys));
+
+	serio->write = sunsu_serio_write;
+	serio->open = sunsu_serio_open;
+	serio->close = sunsu_serio_close;
+	serio->dev.parent = up->port.dev;
+
+	serio_register_port(serio);
+#endif
+
+	sunsu_change_speed(&up->port, up->cflag, 0, quot);
+
+	sunsu_startup(&up->port);
+	return 0;
+}
+
+/*
+ * ------------------------------------------------------------
+ * Serial console driver
+ * ------------------------------------------------------------
+ */
+
+#ifdef CONFIG_SERIAL_SUNSU_CONSOLE
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+/*
+ *	Wait for transmitter & holding register to empty
+ */
+static void wait_for_xmitr(struct uart_sunsu_port *up)
+{
+	unsigned int status, tmout = 10000;
+
+	/* Wait up to 10ms for the character(s) to be sent. */
+	do {
+		status = serial_in(up, UART_LSR);
+
+		if (status & UART_LSR_BI)
+			up->lsr_break_flag = UART_LSR_BI;
+
+		if (--tmout == 0)
+			break;
+		udelay(1);
+	} while ((status & BOTH_EMPTY) != BOTH_EMPTY);
+
+	/* Wait up to 1s for flow control if necessary */
+	if (up->port.flags & UPF_CONS_FLOW) {
+		tmout = 1000000;
+		while (--tmout &&
+		       ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
+			udelay(1);
+	}
+}
+
+static void sunsu_console_putchar(struct uart_port *port, int ch)
+{
+	struct uart_sunsu_port *up =
+		container_of(port, struct uart_sunsu_port, port);
+
+	wait_for_xmitr(up);
+	serial_out(up, UART_TX, ch);
+}
+
+/*
+ *	Print a string to the serial port trying not to disturb
+ *	any possible real use of the port...
+ */
+static void sunsu_console_write(struct console *co, const char *s,
+				unsigned int count)
+{
+	struct uart_sunsu_port *up = &sunsu_ports[co->index];
+	unsigned long flags;
+	unsigned int ier;
+	int locked = 1;
+
+	if (up->port.sysrq || oops_in_progress)
+		locked = spin_trylock_irqsave(&up->port.lock, flags);
+	else
+		spin_lock_irqsave(&up->port.lock, flags);
+
+	/*
+	 *	First save the UER then disable the interrupts
+	 */
+	ier = serial_in(up, UART_IER);
+	serial_out(up, UART_IER, 0);
+
+	uart_console_write(&up->port, s, count, sunsu_console_putchar);
+
+	/*
+	 *	Finally, wait for transmitter to become empty
+	 *	and restore the IER
+	 */
+	wait_for_xmitr(up);
+	serial_out(up, UART_IER, ier);
+
+	if (locked)
+		spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+/*
+ *	Setup initial baud/bits/parity. We do two things here:
+ *	- construct a cflag setting for the first su_open()
+ *	- initialize the serial port
+ *	Return non-zero if we didn't find a serial port.
+ */
+static int __init sunsu_console_setup(struct console *co, char *options)
+{
+	static struct ktermios dummy;
+	struct ktermios termios;
+	struct uart_port *port;
+
+	printk("Console: ttyS%d (SU)\n",
+	       (sunsu_reg.minor - 64) + co->index);
+
+	if (co->index > nr_inst)
+		return -ENODEV;
+	port = &sunsu_ports[co->index].port;
+
+	/*
+	 * Temporary fix.
+	 */
+	spin_lock_init(&port->lock);
+
+	/* Get firmware console settings.  */
+	sunserial_console_termios(co, port->dev->of_node);
+
+	memset(&termios, 0, sizeof(struct ktermios));
+	termios.c_cflag = co->cflag;
+	port->mctrl |= TIOCM_DTR;
+	port->ops->set_termios(port, &termios, &dummy);
+
+	return 0;
+}
+
+static struct console sunsu_console = {
+	.name	=	"ttyS",
+	.write	=	sunsu_console_write,
+	.device	=	uart_console_device,
+	.setup	=	sunsu_console_setup,
+	.flags	=	CON_PRINTBUFFER,
+	.index	=	-1,
+	.data	=	&sunsu_reg,
+};
+
+/*
+ *	Register console.
+ */
+
+static inline struct console *SUNSU_CONSOLE(void)
+{
+	return &sunsu_console;
+}
+#else
+#define SUNSU_CONSOLE()			(NULL)
+#define sunsu_serial_console_init()	do { } while (0)
+#endif
+
+static enum su_type su_get_type(struct device_node *dp)
+{
+	struct device_node *ap = of_find_node_by_path("/aliases");
+	enum su_type rc = SU_PORT_PORT;
+
+	if (ap) {
+		const char *keyb = of_get_property(ap, "keyboard", NULL);
+		const char *ms = of_get_property(ap, "mouse", NULL);
+		struct device_node *match;
+
+		if (keyb) {
+			match = of_find_node_by_path(keyb);
+
+			/*
+			 * The pointer is used as an identifier not
+			 * as a pointer, we can drop the refcount on
+			 * the of__node immediately after getting it.
+			 */
+			of_node_put(match);
+
+			if (dp == match) {
+				rc = SU_PORT_KBD;
+				goto out;
+			}
+		}
+		if (ms) {
+			match = of_find_node_by_path(ms);
+
+			of_node_put(match);
+
+			if (dp == match) {
+				rc = SU_PORT_MS;
+				goto out;
+			}
+		}
+	}
+
+out:
+	of_node_put(ap);
+	return rc;
+}
+
+static int su_probe(struct platform_device *op)
+{
+	struct device_node *dp = op->dev.of_node;
+	struct uart_sunsu_port *up;
+	struct resource *rp;
+	enum su_type type;
+	bool ignore_line;
+	int err;
+
+	type = su_get_type(dp);
+	if (type == SU_PORT_PORT) {
+		if (nr_inst >= UART_NR)
+			return -EINVAL;
+		up = &sunsu_ports[nr_inst];
+	} else {
+		up = kzalloc(sizeof(*up), GFP_KERNEL);
+		if (!up)
+			return -ENOMEM;
+	}
+
+	up->port.line = nr_inst;
+
+	spin_lock_init(&up->port.lock);
+
+	up->su_type = type;
+
+	rp = &op->resource[0];
+	up->port.mapbase = rp->start;
+	up->reg_size = resource_size(rp);
+	up->port.membase = of_ioremap(rp, 0, up->reg_size, "su");
+	if (!up->port.membase) {
+		if (type != SU_PORT_PORT)
+			kfree(up);
+		return -ENOMEM;
+	}
+
+	up->port.irq = op->archdata.irqs[0];
+
+	up->port.dev = &op->dev;
+
+	up->port.type = PORT_UNKNOWN;
+	up->port.uartclk = (SU_BASE_BAUD * 16);
+	up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNSU_CONSOLE);
+
+	err = 0;
+	if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
+		err = sunsu_kbd_ms_init(up);
+		if (err) {
+			of_iounmap(&op->resource[0],
+				   up->port.membase, up->reg_size);
+			kfree(up);
+			return err;
+		}
+		platform_set_drvdata(op, up);
+
+		nr_inst++;
+
+		return 0;
+	}
+
+	up->port.flags |= UPF_BOOT_AUTOCONF;
+
+	sunsu_autoconfig(up);
+
+	err = -ENODEV;
+	if (up->port.type == PORT_UNKNOWN)
+		goto out_unmap;
+
+	up->port.ops = &sunsu_pops;
+
+	ignore_line = false;
+	if (of_node_name_eq(dp, "rsc-console") ||
+	    of_node_name_eq(dp, "lom-console"))
+		ignore_line = true;
+
+	sunserial_console_match(SUNSU_CONSOLE(), dp,
+				&sunsu_reg, up->port.line,
+				ignore_line);
+	err = uart_add_one_port(&sunsu_reg, &up->port);
+	if (err)
+		goto out_unmap;
+
+	platform_set_drvdata(op, up);
+
+	nr_inst++;
+
+	return 0;
+
+out_unmap:
+	of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
+	kfree(up);
+	return err;
+}
+
+static int su_remove(struct platform_device *op)
+{
+	struct uart_sunsu_port *up = platform_get_drvdata(op);
+	bool kbdms = false;
+
+	if (up->su_type == SU_PORT_MS ||
+	    up->su_type == SU_PORT_KBD)
+		kbdms = true;
+
+	if (kbdms) {
+#ifdef CONFIG_SERIO
+		serio_unregister_port(&up->serio);
+#endif
+	} else if (up->port.type != PORT_UNKNOWN)
+		uart_remove_one_port(&sunsu_reg, &up->port);
+
+	if (up->port.membase)
+		of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
+
+	if (kbdms)
+		kfree(up);
+
+	return 0;
+}
+
+static const struct of_device_id su_match[] = {
+	{
+		.name = "su",
+	},
+	{
+		.name = "su_pnp",
+	},
+	{
+		.name = "serial",
+		.compatible = "su",
+	},
+	{
+		.type = "serial",
+		.compatible = "su",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, su_match);
+
+static struct platform_driver su_driver = {
+	.driver = {
+		.name = "su",
+		.of_match_table = su_match,
+	},
+	.probe		= su_probe,
+	.remove		= su_remove,
+};
+
+static int __init sunsu_init(void)
+{
+	struct device_node *dp;
+	int err;
+	int num_uart = 0;
+
+	for_each_node_by_name(dp, "su") {
+		if (su_get_type(dp) == SU_PORT_PORT)
+			num_uart++;
+	}
+	for_each_node_by_name(dp, "su_pnp") {
+		if (su_get_type(dp) == SU_PORT_PORT)
+			num_uart++;
+	}
+	for_each_node_by_name(dp, "serial") {
+		if (of_device_is_compatible(dp, "su")) {
+			if (su_get_type(dp) == SU_PORT_PORT)
+				num_uart++;
+		}
+	}
+	for_each_node_by_type(dp, "serial") {
+		if (of_device_is_compatible(dp, "su")) {
+			if (su_get_type(dp) == SU_PORT_PORT)
+				num_uart++;
+		}
+	}
+
+	if (num_uart) {
+		err = sunserial_register_minors(&sunsu_reg, num_uart);
+		if (err)
+			return err;
+	}
+
+	err = platform_driver_register(&su_driver);
+	if (err && num_uart)
+		sunserial_unregister_minors(&sunsu_reg, num_uart);
+
+	return err;
+}
+
+static void __exit sunsu_exit(void)
+{
+	platform_driver_unregister(&su_driver);
+	if (sunsu_reg.nr)
+		sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr);
+}
+
+module_init(sunsu_init);
+module_exit(sunsu_exit);
+
+MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller");
+MODULE_DESCRIPTION("Sun SU serial port driver");
+MODULE_VERSION("2.0");
+MODULE_LICENSE("GPL");