tty: move drivers/serial/ to drivers/tty/serial/

The serial drivers are really just tty drivers, so move them to
drivers/tty/ to make things a bit neater overall.

This is part of the tty/serial driver movement proceedure as proposed by
Arnd Bergmann and approved by everyone involved a number of months ago.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rogier Wolff <R.E.Wolff@bitwizard.nl>
Cc: Michael H. Warfield <mhw@wittsend.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 1304 deletions

diff --git a/drivers/serial/zs.c b/drivers/serial/zs.c
deleted file mode 100644
index 1a7fd3e..0000000
--- a/drivers/serial/zs.c
+++ /dev/null
@@ -1,1304 +0,0 @@
-/*
- * zs.c: Serial port driver for IOASIC DECstations.
- *
- * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
- * Derived from drivers/macintosh/macserial.c by Harald Koerfgen.
- *
- * DECstation changes
- * Copyright (C) 1998-2000 Harald Koerfgen
- * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007  Maciej W. Rozycki
- *
- * For the rest of the code the original Copyright applies:
- * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- *
- *
- * Note: for IOASIC systems the wiring is as follows:
- *
- * mouse/keyboard:
- * DIN-7 MJ-4  signal        SCC
- * 2     1     TxD       <-  A.TxD
- * 3     4     RxD       ->  A.RxD
- *
- * EIA-232/EIA-423:
- * DB-25 MMJ-6 signal        SCC
- * 2     2     TxD       <-  B.TxD
- * 3     5     RxD       ->  B.RxD
- * 4           RTS       <- ~A.RTS
- * 5           CTS       -> ~B.CTS
- * 6     6     DSR       -> ~A.SYNC
- * 8           CD        -> ~B.DCD
- * 12          DSRS(DCE) -> ~A.CTS  (*)
- * 15          TxC       ->  B.TxC
- * 17          RxC       ->  B.RxC
- * 20    1     DTR       <- ~A.DTR
- * 22          RI        -> ~A.DCD
- * 23          DSRS(DTE) <- ~B.RTS
- *
- * (*) EIA-232 defines the signal at this pin to be SCD, while DSRS(DCE)
- *     is shared with DSRS(DTE) at pin 23.
- *
- * As you can immediately notice the wiring of the RTS, DTR and DSR signals
- * is a bit odd.  This makes the handling of port B unnecessarily
- * complicated and prevents the use of some automatic modes of operation.
- */
-
-#if defined(CONFIG_SERIAL_ZS_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/bug.h>
-#include <linux/console.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
-#include <linux/irqflags.h>
-#include <linux/kernel.h>
-#include <linux/major.h>
-#include <linux/serial.h>
-#include <linux/serial_core.h>
-#include <linux/spinlock.h>
-#include <linux/sysrq.h>
-#include <linux/tty.h>
-#include <linux/types.h>
-
-#include <asm/atomic.h>
-#include <asm/system.h>
-
-#include <asm/dec/interrupts.h>
-#include <asm/dec/ioasic_addrs.h>
-#include <asm/dec/system.h>
-
-#include "zs.h"
-
-
-MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
-MODULE_DESCRIPTION("DECstation Z85C30 serial driver");
-MODULE_LICENSE("GPL");
-
-
-static char zs_name[] __initdata = "DECstation Z85C30 serial driver version ";
-static char zs_version[] __initdata = "0.10";
-
-/*
- * It would be nice to dynamically allocate everything that
- * depends on ZS_NUM_SCCS, so we could support any number of
- * Z85C30s, but for now...
- */
-#define ZS_NUM_SCCS	2		/* Max # of ZS chips supported.  */
-#define ZS_NUM_CHAN	2		/* 2 channels per chip.  */
-#define ZS_CHAN_A	0		/* Index of the channel A.  */
-#define ZS_CHAN_B	1		/* Index of the channel B.  */
-#define ZS_CHAN_IO_SIZE 8		/* IOMEM space size.  */
-#define ZS_CHAN_IO_STRIDE 4		/* Register alignment.  */
-#define ZS_CHAN_IO_OFFSET 1		/* The SCC resides on the high byte
-					   of the 16-bit IOBUS.  */
-#define ZS_CLOCK        7372800 	/* Z85C30 PCLK input clock rate.  */
-
-#define to_zport(uport) container_of(uport, struct zs_port, port)
-
-struct zs_parms {
-	resource_size_t scc[ZS_NUM_SCCS];
-	int irq[ZS_NUM_SCCS];
-};
-
-static struct zs_scc zs_sccs[ZS_NUM_SCCS];
-
-static u8 zs_init_regs[ZS_NUM_REGS] __initdata = {
-	0,				/* write 0 */
-	PAR_SPEC,			/* write 1 */
-	0,				/* write 2 */
-	0,				/* write 3 */
-	X16CLK | SB1,			/* write 4 */
-	0,				/* write 5 */
-	0, 0, 0,			/* write 6, 7, 8 */
-	MIE | DLC | NV,			/* write 9 */
-	NRZ,				/* write 10 */
-	TCBR | RCBR,			/* write 11 */
-	0, 0,				/* BRG time constant, write 12 + 13 */
-	BRSRC | BRENABL,		/* write 14 */
-	0,				/* write 15 */
-};
-
-/*
- * Debugging.
- */
-#undef ZS_DEBUG_REGS
-
-
-/*
- * Reading and writing Z85C30 registers.
- */
-static void recovery_delay(void)
-{
-	udelay(2);
-}
-
-static u8 read_zsreg(struct zs_port *zport, int reg)
-{
-	void __iomem *control = zport->port.membase + ZS_CHAN_IO_OFFSET;
-	u8 retval;
-
-	if (reg != 0) {
-		writeb(reg & 0xf, control);
-		fast_iob();
-		recovery_delay();
-	}
-	retval = readb(control);
-	recovery_delay();
-	return retval;
-}
-
-static void write_zsreg(struct zs_port *zport, int reg, u8 value)
-{
-	void __iomem *control = zport->port.membase + ZS_CHAN_IO_OFFSET;
-
-	if (reg != 0) {
-		writeb(reg & 0xf, control);
-		fast_iob(); recovery_delay();
-	}
-	writeb(value, control);
-	fast_iob();
-	recovery_delay();
-	return;
-}
-
-static u8 read_zsdata(struct zs_port *zport)
-{
-	void __iomem *data = zport->port.membase +
-			     ZS_CHAN_IO_STRIDE + ZS_CHAN_IO_OFFSET;
-	u8 retval;
-
-	retval = readb(data);
-	recovery_delay();
-	return retval;
-}
-
-static void write_zsdata(struct zs_port *zport, u8 value)
-{
-	void __iomem *data = zport->port.membase +
-			     ZS_CHAN_IO_STRIDE + ZS_CHAN_IO_OFFSET;
-
-	writeb(value, data);
-	fast_iob();
-	recovery_delay();
-	return;
-}
-
-#ifdef ZS_DEBUG_REGS
-void zs_dump(void)
-{
-	struct zs_port *zport;
-	int i, j;
-
-	for (i = 0; i < ZS_NUM_SCCS * ZS_NUM_CHAN; i++) {
-		zport = &zs_sccs[i / ZS_NUM_CHAN].zport[i % ZS_NUM_CHAN];
-
-		if (!zport->scc)
-			continue;
-
-		for (j = 0; j < 16; j++)
-			printk("W%-2d = 0x%02x\t", j, zport->regs[j]);
-		printk("\n");
-		for (j = 0; j < 16; j++)
-			printk("R%-2d = 0x%02x\t", j, read_zsreg(zport, j));
-		printk("\n\n");
-	}
-}
-#endif
-
-
-static void zs_spin_lock_cond_irq(spinlock_t *lock, int irq)
-{
-	if (irq)
-		spin_lock_irq(lock);
-	else
-		spin_lock(lock);
-}
-
-static void zs_spin_unlock_cond_irq(spinlock_t *lock, int irq)
-{
-	if (irq)
-		spin_unlock_irq(lock);
-	else
-		spin_unlock(lock);
-}
-
-static int zs_receive_drain(struct zs_port *zport)
-{
-	int loops = 10000;
-
-	while ((read_zsreg(zport, R0) & Rx_CH_AV) && --loops)
-		read_zsdata(zport);
-	return loops;
-}
-
-static int zs_transmit_drain(struct zs_port *zport, int irq)
-{
-	struct zs_scc *scc = zport->scc;
-	int loops = 10000;
-
-	while (!(read_zsreg(zport, R0) & Tx_BUF_EMP) && --loops) {
-		zs_spin_unlock_cond_irq(&scc->zlock, irq);
-		udelay(2);
-		zs_spin_lock_cond_irq(&scc->zlock, irq);
-	}
-	return loops;
-}
-
-static int zs_line_drain(struct zs_port *zport, int irq)
-{
-	struct zs_scc *scc = zport->scc;
-	int loops = 10000;
-
-	while (!(read_zsreg(zport, R1) & ALL_SNT) && --loops) {
-		zs_spin_unlock_cond_irq(&scc->zlock, irq);
-		udelay(2);
-		zs_spin_lock_cond_irq(&scc->zlock, irq);
-	}
-	return loops;
-}
-
-
-static void load_zsregs(struct zs_port *zport, u8 *regs, int irq)
-{
-	/* Let the current transmission finish.  */
-	zs_line_drain(zport, irq);
-	/* Load 'em up.  */
-	write_zsreg(zport, R3, regs[3] & ~RxENABLE);
-	write_zsreg(zport, R5, regs[5] & ~TxENAB);
-	write_zsreg(zport, R4, regs[4]);
-	write_zsreg(zport, R9, regs[9]);
-	write_zsreg(zport, R1, regs[1]);
-	write_zsreg(zport, R2, regs[2]);
-	write_zsreg(zport, R10, regs[10]);
-	write_zsreg(zport, R14, regs[14] & ~BRENABL);
-	write_zsreg(zport, R11, regs[11]);
-	write_zsreg(zport, R12, regs[12]);
-	write_zsreg(zport, R13, regs[13]);
-	write_zsreg(zport, R14, regs[14]);
-	write_zsreg(zport, R15, regs[15]);
-	if (regs[3] & RxENABLE)
-		write_zsreg(zport, R3, regs[3]);
-	if (regs[5] & TxENAB)
-		write_zsreg(zport, R5, regs[5]);
-	return;
-}
-
-
-/*
- * Status handling routines.
- */
-
-/*
- * zs_tx_empty() -- get the transmitter empty status
- *
- * Purpose: Let user call ioctl() to get info when the UART physically
- * 	    is emptied.  On bus types like RS485, the transmitter must
- * 	    release the bus after transmitting.  This must be done when
- * 	    the transmit shift register is empty, not be done when the
- * 	    transmit holding register is empty.  This functionality
- * 	    allows an RS485 driver to be written in user space.
- */
-static unsigned int zs_tx_empty(struct uart_port *uport)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	unsigned long flags;
-	u8 status;
-
-	spin_lock_irqsave(&scc->zlock, flags);
-	status = read_zsreg(zport, R1);
-	spin_unlock_irqrestore(&scc->zlock, flags);
-
-	return status & ALL_SNT ? TIOCSER_TEMT : 0;
-}
-
-static unsigned int zs_raw_get_ab_mctrl(struct zs_port *zport_a,
-					struct zs_port *zport_b)
-{
-	u8 status_a, status_b;
-	unsigned int mctrl;
-
-	status_a = read_zsreg(zport_a, R0);
-	status_b = read_zsreg(zport_b, R0);
-
-	mctrl = ((status_b & CTS) ? TIOCM_CTS : 0) |
-		((status_b & DCD) ? TIOCM_CAR : 0) |
-		((status_a & DCD) ? TIOCM_RNG : 0) |
-		((status_a & SYNC_HUNT) ? TIOCM_DSR : 0);
-
-	return mctrl;
-}
-
-static unsigned int zs_raw_get_mctrl(struct zs_port *zport)
-{
-	struct zs_port *zport_a = &zport->scc->zport[ZS_CHAN_A];
-
-	return zport != zport_a ? zs_raw_get_ab_mctrl(zport_a, zport) : 0;
-}
-
-static unsigned int zs_raw_xor_mctrl(struct zs_port *zport)
-{
-	struct zs_port *zport_a = &zport->scc->zport[ZS_CHAN_A];
-	unsigned int mmask, mctrl, delta;
-	u8 mask_a, mask_b;
-
-	if (zport == zport_a)
-		return 0;
-
-	mask_a = zport_a->regs[15];
-	mask_b = zport->regs[15];
-
-	mmask = ((mask_b & CTSIE) ? TIOCM_CTS : 0) |
-		((mask_b & DCDIE) ? TIOCM_CAR : 0) |
-		((mask_a & DCDIE) ? TIOCM_RNG : 0) |
-		((mask_a & SYNCIE) ? TIOCM_DSR : 0);
-
-	mctrl = zport->mctrl;
-	if (mmask) {
-		mctrl &= ~mmask;
-		mctrl |= zs_raw_get_ab_mctrl(zport_a, zport) & mmask;
-	}
-
-	delta = mctrl ^ zport->mctrl;
-	if (delta)
-		zport->mctrl = mctrl;
-
-	return delta;
-}
-
-static unsigned int zs_get_mctrl(struct uart_port *uport)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	unsigned int mctrl;
-
-	spin_lock(&scc->zlock);
-	mctrl = zs_raw_get_mctrl(zport);
-	spin_unlock(&scc->zlock);
-
-	return mctrl;
-}
-
-static void zs_set_mctrl(struct uart_port *uport, unsigned int mctrl)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
-	u8 oldloop, newloop;
-
-	spin_lock(&scc->zlock);
-	if (zport != zport_a) {
-		if (mctrl & TIOCM_DTR)
-			zport_a->regs[5] |= DTR;
-		else
-			zport_a->regs[5] &= ~DTR;
-		if (mctrl & TIOCM_RTS)
-			zport_a->regs[5] |= RTS;
-		else
-			zport_a->regs[5] &= ~RTS;
-		write_zsreg(zport_a, R5, zport_a->regs[5]);
-	}
-
-	/* Rarely modified, so don't poke at hardware unless necessary. */
-	oldloop = zport->regs[14];
-	newloop = oldloop;
-	if (mctrl & TIOCM_LOOP)
-		newloop |= LOOPBAK;
-	else
-		newloop &= ~LOOPBAK;
-	if (newloop != oldloop) {
-		zport->regs[14] = newloop;
-		write_zsreg(zport, R14, zport->regs[14]);
-	}
-	spin_unlock(&scc->zlock);
-}
-
-static void zs_raw_stop_tx(struct zs_port *zport)
-{
-	write_zsreg(zport, R0, RES_Tx_P);
-	zport->tx_stopped = 1;
-}
-
-static void zs_stop_tx(struct uart_port *uport)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-
-	spin_lock(&scc->zlock);
-	zs_raw_stop_tx(zport);
-	spin_unlock(&scc->zlock);
-}
-
-static void zs_raw_transmit_chars(struct zs_port *);
-
-static void zs_start_tx(struct uart_port *uport)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-
-	spin_lock(&scc->zlock);
-	if (zport->tx_stopped) {
-		zs_transmit_drain(zport, 0);
-		zport->tx_stopped = 0;
-		zs_raw_transmit_chars(zport);
-	}
-	spin_unlock(&scc->zlock);
-}
-
-static void zs_stop_rx(struct uart_port *uport)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
-
-	spin_lock(&scc->zlock);
-	zport->regs[15] &= ~BRKIE;
-	zport->regs[1] &= ~(RxINT_MASK | TxINT_ENAB);
-	zport->regs[1] |= RxINT_DISAB;
-
-	if (zport != zport_a) {
-		/* A-side DCD tracks RI and SYNC tracks DSR.  */
-		zport_a->regs[15] &= ~(DCDIE | SYNCIE);
-		write_zsreg(zport_a, R15, zport_a->regs[15]);
-		if (!(zport_a->regs[15] & BRKIE)) {
-			zport_a->regs[1] &= ~EXT_INT_ENAB;
-			write_zsreg(zport_a, R1, zport_a->regs[1]);
-		}
-
-		/* This-side DCD tracks DCD and CTS tracks CTS.  */
-		zport->regs[15] &= ~(DCDIE | CTSIE);
-		zport->regs[1] &= ~EXT_INT_ENAB;
-	} else {
-		/* DCD tracks RI and SYNC tracks DSR for the B side.  */
-		if (!(zport->regs[15] & (DCDIE | SYNCIE)))
-			zport->regs[1] &= ~EXT_INT_ENAB;
-	}
-
-	write_zsreg(zport, R15, zport->regs[15]);
-	write_zsreg(zport, R1, zport->regs[1]);
-	spin_unlock(&scc->zlock);
-}
-
-static void zs_enable_ms(struct uart_port *uport)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
-
-	if (zport == zport_a)
-		return;
-
-	spin_lock(&scc->zlock);
-
-	/* Clear Ext interrupts if not being handled already.  */
-	if (!(zport_a->regs[1] & EXT_INT_ENAB))
-		write_zsreg(zport_a, R0, RES_EXT_INT);
-
-	/* A-side DCD tracks RI and SYNC tracks DSR.  */
-	zport_a->regs[1] |= EXT_INT_ENAB;
-	zport_a->regs[15] |= DCDIE | SYNCIE;
-
-	/* This-side DCD tracks DCD and CTS tracks CTS.  */
-	zport->regs[15] |= DCDIE | CTSIE;
-
-	zs_raw_xor_mctrl(zport);
-
-	write_zsreg(zport_a, R1, zport_a->regs[1]);
-	write_zsreg(zport_a, R15, zport_a->regs[15]);
-	write_zsreg(zport, R15, zport->regs[15]);
-	spin_unlock(&scc->zlock);
-}
-
-static void zs_break_ctl(struct uart_port *uport, int break_state)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	unsigned long flags;
-
-	spin_lock_irqsave(&scc->zlock, flags);
-	if (break_state == -1)
-		zport->regs[5] |= SND_BRK;
-	else
-		zport->regs[5] &= ~SND_BRK;
-	write_zsreg(zport, R5, zport->regs[5]);
-	spin_unlock_irqrestore(&scc->zlock, flags);
-}
-
-
-/*
- * Interrupt handling routines.
- */
-#define Rx_BRK 0x0100			/* BREAK event software flag.  */
-#define Rx_SYS 0x0200			/* SysRq event software flag.  */
-
-static void zs_receive_chars(struct zs_port *zport)
-{
-	struct uart_port *uport = &zport->port;
-	struct zs_scc *scc = zport->scc;
-	struct uart_icount *icount;
-	unsigned int avail, status, ch, flag;
-	int count;
-
-	for (count = 16; count; count--) {
-		spin_lock(&scc->zlock);
-		avail = read_zsreg(zport, R0) & Rx_CH_AV;
-		spin_unlock(&scc->zlock);
-		if (!avail)
-			break;
-
-		spin_lock(&scc->zlock);
-		status = read_zsreg(zport, R1) & (Rx_OVR | FRM_ERR | PAR_ERR);
-		ch = read_zsdata(zport);
-		spin_unlock(&scc->zlock);
-
-		flag = TTY_NORMAL;
-
-		icount = &uport->icount;
-		icount->rx++;
-
-		/* Handle the null char got when BREAK is removed.  */
-		if (!ch)
-			status |= zport->tty_break;
-		if (unlikely(status &
-			     (Rx_OVR | FRM_ERR | PAR_ERR | Rx_SYS | Rx_BRK))) {
-			zport->tty_break = 0;
-
-			/* Reset the error indication.  */
-			if (status & (Rx_OVR | FRM_ERR | PAR_ERR)) {
-				spin_lock(&scc->zlock);
-				write_zsreg(zport, R0, ERR_RES);
-				spin_unlock(&scc->zlock);
-			}
-
-			if (status & (Rx_SYS | Rx_BRK)) {
-				icount->brk++;
-				/* SysRq discards the null char.  */
-				if (status & Rx_SYS)
-					continue;
-			} else if (status & FRM_ERR)
-				icount->frame++;
-			else if (status & PAR_ERR)
-				icount->parity++;
-			if (status & Rx_OVR)
-				icount->overrun++;
-
-			status &= uport->read_status_mask;
-			if (status & Rx_BRK)
-				flag = TTY_BREAK;
-			else if (status & FRM_ERR)
-				flag = TTY_FRAME;
-			else if (status & PAR_ERR)
-				flag = TTY_PARITY;
-		}
-
-		if (uart_handle_sysrq_char(uport, ch))
-			continue;
-
-		uart_insert_char(uport, status, Rx_OVR, ch, flag);
-	}
-
-	tty_flip_buffer_push(uport->state->port.tty);
-}
-
-static void zs_raw_transmit_chars(struct zs_port *zport)
-{
-	struct circ_buf *xmit = &zport->port.state->xmit;
-
-	/* XON/XOFF chars.  */
-	if (zport->port.x_char) {
-		write_zsdata(zport, zport->port.x_char);
-		zport->port.icount.tx++;
-		zport->port.x_char = 0;
-		return;
-	}
-
-	/* If nothing to do or stopped or hardware stopped.  */
-	if (uart_circ_empty(xmit) || uart_tx_stopped(&zport->port)) {
-		zs_raw_stop_tx(zport);
-		return;
-	}
-
-	/* Send char.  */
-	write_zsdata(zport, xmit->buf[xmit->tail]);
-	xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-	zport->port.icount.tx++;
-
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(&zport->port);
-
-	/* Are we are done?  */
-	if (uart_circ_empty(xmit))
-		zs_raw_stop_tx(zport);
-}
-
-static void zs_transmit_chars(struct zs_port *zport)
-{
-	struct zs_scc *scc = zport->scc;
-
-	spin_lock(&scc->zlock);
-	zs_raw_transmit_chars(zport);
-	spin_unlock(&scc->zlock);
-}
-
-static void zs_status_handle(struct zs_port *zport, struct zs_port *zport_a)
-{
-	struct uart_port *uport = &zport->port;
-	struct zs_scc *scc = zport->scc;
-	unsigned int delta;
-	u8 status, brk;
-
-	spin_lock(&scc->zlock);
-
-	/* Get status from Read Register 0.  */
-	status = read_zsreg(zport, R0);
-
-	if (zport->regs[15] & BRKIE) {
-		brk = status & BRK_ABRT;
-		if (brk && !zport->brk) {
-			spin_unlock(&scc->zlock);
-			if (uart_handle_break(uport))
-				zport->tty_break = Rx_SYS;
-			else
-				zport->tty_break = Rx_BRK;
-			spin_lock(&scc->zlock);
-		}
-		zport->brk = brk;
-	}
-
-	if (zport != zport_a) {
-		delta = zs_raw_xor_mctrl(zport);
-		spin_unlock(&scc->zlock);
-
-		if (delta & TIOCM_CTS)
-			uart_handle_cts_change(uport,
-					       zport->mctrl & TIOCM_CTS);
-		if (delta & TIOCM_CAR)
-			uart_handle_dcd_change(uport,
-					       zport->mctrl & TIOCM_CAR);
-		if (delta & TIOCM_RNG)
-			uport->icount.dsr++;
-		if (delta & TIOCM_DSR)
-			uport->icount.rng++;
-
-		if (delta)
-			wake_up_interruptible(&uport->state->port.delta_msr_wait);
-
-		spin_lock(&scc->zlock);
-	}
-
-	/* Clear the status condition...  */
-	write_zsreg(zport, R0, RES_EXT_INT);
-
-	spin_unlock(&scc->zlock);
-}
-
-/*
- * This is the Z85C30 driver's generic interrupt routine.
- */
-static irqreturn_t zs_interrupt(int irq, void *dev_id)
-{
-	struct zs_scc *scc = dev_id;
-	struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
-	struct zs_port *zport_b = &scc->zport[ZS_CHAN_B];
-	irqreturn_t status = IRQ_NONE;
-	u8 zs_intreg;
-	int count;
-
-	/*
-	 * NOTE: The read register 3, which holds the irq status,
-	 *       does so for both channels on each chip.  Although
-	 *       the status value itself must be read from the A
-	 *       channel and is only valid when read from channel A.
-	 *       Yes... broken hardware...
-	 */
-	for (count = 16; count; count--) {
-		spin_lock(&scc->zlock);
-		zs_intreg = read_zsreg(zport_a, R3);
-		spin_unlock(&scc->zlock);
-		if (!zs_intreg)
-			break;
-
-		/*
-		 * We do not like losing characters, so we prioritise
-		 * interrupt sources a little bit differently than
-		 * the SCC would, was it allowed to.
-		 */
-		if (zs_intreg & CHBRxIP)
-			zs_receive_chars(zport_b);
-		if (zs_intreg & CHARxIP)
-			zs_receive_chars(zport_a);
-		if (zs_intreg & CHBEXT)
-			zs_status_handle(zport_b, zport_a);
-		if (zs_intreg & CHAEXT)
-			zs_status_handle(zport_a, zport_a);
-		if (zs_intreg & CHBTxIP)
-			zs_transmit_chars(zport_b);
-		if (zs_intreg & CHATxIP)
-			zs_transmit_chars(zport_a);
-
-		status = IRQ_HANDLED;
-	}
-
-	return status;
-}
-
-
-/*
- * Finally, routines used to initialize the serial port.
- */
-static int zs_startup(struct uart_port *uport)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	unsigned long flags;
-	int irq_guard;
-	int ret;
-
-	irq_guard = atomic_add_return(1, &scc->irq_guard);
-	if (irq_guard == 1) {
-		ret = request_irq(zport->port.irq, zs_interrupt,
-				  IRQF_SHARED, "scc", scc);
-		if (ret) {
-			atomic_add(-1, &scc->irq_guard);
-			printk(KERN_ERR "zs: can't get irq %d\n",
-			       zport->port.irq);
-			return ret;
-		}
-	}
-
-	spin_lock_irqsave(&scc->zlock, flags);
-
-	/* Clear the receive FIFO.  */
-	zs_receive_drain(zport);
-
-	/* Clear the interrupt registers.  */
-	write_zsreg(zport, R0, ERR_RES);
-	write_zsreg(zport, R0, RES_Tx_P);
-	/* But Ext only if not being handled already.  */
-	if (!(zport->regs[1] & EXT_INT_ENAB))
-		write_zsreg(zport, R0, RES_EXT_INT);
-
-	/* Finally, enable sequencing and interrupts.  */
-	zport->regs[1] &= ~RxINT_MASK;
-	zport->regs[1] |= RxINT_ALL | TxINT_ENAB | EXT_INT_ENAB;
-	zport->regs[3] |= RxENABLE;
-	zport->regs[15] |= BRKIE;
-	write_zsreg(zport, R1, zport->regs[1]);
-	write_zsreg(zport, R3, zport->regs[3]);
-	write_zsreg(zport, R5, zport->regs[5]);
-	write_zsreg(zport, R15, zport->regs[15]);
-
-	/* Record the current state of RR0.  */
-	zport->mctrl = zs_raw_get_mctrl(zport);
-	zport->brk = read_zsreg(zport, R0) & BRK_ABRT;
-
-	zport->tx_stopped = 1;
-
-	spin_unlock_irqrestore(&scc->zlock, flags);
-
-	return 0;
-}
-
-static void zs_shutdown(struct uart_port *uport)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	unsigned long flags;
-	int irq_guard;
-
-	spin_lock_irqsave(&scc->zlock, flags);
-
-	zport->regs[3] &= ~RxENABLE;
-	write_zsreg(zport, R5, zport->regs[5]);
-	write_zsreg(zport, R3, zport->regs[3]);
-
-	spin_unlock_irqrestore(&scc->zlock, flags);
-
-	irq_guard = atomic_add_return(-1, &scc->irq_guard);
-	if (!irq_guard)
-		free_irq(zport->port.irq, scc);
-}
-
-
-static void zs_reset(struct zs_port *zport)
-{
-	struct zs_scc *scc = zport->scc;
-	int irq;
-	unsigned long flags;
-
-	spin_lock_irqsave(&scc->zlock, flags);
-	irq = !irqs_disabled_flags(flags);
-	if (!scc->initialised) {
-		/* Reset the pointer first, just in case...  */
-		read_zsreg(zport, R0);
-		/* And let the current transmission finish.  */
-		zs_line_drain(zport, irq);
-		write_zsreg(zport, R9, FHWRES);
-		udelay(10);
-		write_zsreg(zport, R9, 0);
-		scc->initialised = 1;
-	}
-	load_zsregs(zport, zport->regs, irq);
-	spin_unlock_irqrestore(&scc->zlock, flags);
-}
-
-static void zs_set_termios(struct uart_port *uport, struct ktermios *termios,
-			   struct ktermios *old_termios)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
-	int irq;
-	unsigned int baud, brg;
-	unsigned long flags;
-
-	spin_lock_irqsave(&scc->zlock, flags);
-	irq = !irqs_disabled_flags(flags);
-
-	/* Byte size.  */
-	zport->regs[3] &= ~RxNBITS_MASK;
-	zport->regs[5] &= ~TxNBITS_MASK;
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		zport->regs[3] |= Rx5;
-		zport->regs[5] |= Tx5;
-		break;
-	case CS6:
-		zport->regs[3] |= Rx6;
-		zport->regs[5] |= Tx6;
-		break;
-	case CS7:
-		zport->regs[3] |= Rx7;
-		zport->regs[5] |= Tx7;
-		break;
-	case CS8:
-	default:
-		zport->regs[3] |= Rx8;
-		zport->regs[5] |= Tx8;
-		break;
-	}
-
-	/* Parity and stop bits.  */
-	zport->regs[4] &= ~(XCLK_MASK | SB_MASK | PAR_ENA | PAR_EVEN);
-	if (termios->c_cflag & CSTOPB)
-		zport->regs[4] |= SB2;
-	else
-		zport->regs[4] |= SB1;
-	if (termios->c_cflag & PARENB)
-		zport->regs[4] |= PAR_ENA;
-	if (!(termios->c_cflag & PARODD))
-		zport->regs[4] |= PAR_EVEN;
-	switch (zport->clk_mode) {
-	case 64:
-		zport->regs[4] |= X64CLK;
-		break;
-	case 32:
-		zport->regs[4] |= X32CLK;
-		break;
-	case 16:
-		zport->regs[4] |= X16CLK;
-		break;
-	case 1:
-		zport->regs[4] |= X1CLK;
-		break;
-	default:
-		BUG();
-	}
-
-	baud = uart_get_baud_rate(uport, termios, old_termios, 0,
-				  uport->uartclk / zport->clk_mode / 4);
-
-	brg = ZS_BPS_TO_BRG(baud, uport->uartclk / zport->clk_mode);
-	zport->regs[12] = brg & 0xff;
-	zport->regs[13] = (brg >> 8) & 0xff;
-
-	uart_update_timeout(uport, termios->c_cflag, baud);
-
-	uport->read_status_mask = Rx_OVR;
-	if (termios->c_iflag & INPCK)
-		uport->read_status_mask |= FRM_ERR | PAR_ERR;
-	if (termios->c_iflag & (BRKINT | PARMRK))
-		uport->read_status_mask |= Rx_BRK;
-
-	uport->ignore_status_mask = 0;
-	if (termios->c_iflag & IGNPAR)
-		uport->ignore_status_mask |= FRM_ERR | PAR_ERR;
-	if (termios->c_iflag & IGNBRK) {
-		uport->ignore_status_mask |= Rx_BRK;
-		if (termios->c_iflag & IGNPAR)
-			uport->ignore_status_mask |= Rx_OVR;
-	}
-
-	if (termios->c_cflag & CREAD)
-		zport->regs[3] |= RxENABLE;
-	else
-		zport->regs[3] &= ~RxENABLE;
-
-	if (zport != zport_a) {
-		if (!(termios->c_cflag & CLOCAL)) {
-			zport->regs[15] |= DCDIE;
-		} else
-			zport->regs[15] &= ~DCDIE;
-		if (termios->c_cflag & CRTSCTS) {
-			zport->regs[15] |= CTSIE;
-		} else
-			zport->regs[15] &= ~CTSIE;
-		zs_raw_xor_mctrl(zport);
-	}
-
-	/* Load up the new values.  */
-	load_zsregs(zport, zport->regs, irq);
-
-	spin_unlock_irqrestore(&scc->zlock, flags);
-}
-
-/*
- * Hack alert!
- * Required solely so that the initial PROM-based console
- * works undisturbed in parallel with this one.
- */
-static void zs_pm(struct uart_port *uport, unsigned int state,
-		  unsigned int oldstate)
-{
-	struct zs_port *zport = to_zport(uport);
-
-	if (state < 3)
-		zport->regs[5] |= TxENAB;
-	else
-		zport->regs[5] &= ~TxENAB;
-	write_zsreg(zport, R5, zport->regs[5]);
-}
-
-
-static const char *zs_type(struct uart_port *uport)
-{
-	return "Z85C30 SCC";
-}
-
-static void zs_release_port(struct uart_port *uport)
-{
-	iounmap(uport->membase);
-	uport->membase = 0;
-	release_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE);
-}
-
-static int zs_map_port(struct uart_port *uport)
-{
-	if (!uport->membase)
-		uport->membase = ioremap_nocache(uport->mapbase,
-						 ZS_CHAN_IO_SIZE);
-	if (!uport->membase) {
-		printk(KERN_ERR "zs: Cannot map MMIO\n");
-		return -ENOMEM;
-	}
-	return 0;
-}
-
-static int zs_request_port(struct uart_port *uport)
-{
-	int ret;
-
-	if (!request_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE, "scc")) {
-		printk(KERN_ERR "zs: Unable to reserve MMIO resource\n");
-		return -EBUSY;
-	}
-	ret = zs_map_port(uport);
-	if (ret) {
-		release_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE);
-		return ret;
-	}
-	return 0;
-}
-
-static void zs_config_port(struct uart_port *uport, int flags)
-{
-	struct zs_port *zport = to_zport(uport);
-
-	if (flags & UART_CONFIG_TYPE) {
-		if (zs_request_port(uport))
-			return;
-
-		uport->type = PORT_ZS;
-
-		zs_reset(zport);
-	}
-}
-
-static int zs_verify_port(struct uart_port *uport, struct serial_struct *ser)
-{
-	struct zs_port *zport = to_zport(uport);
-	int ret = 0;
-
-	if (ser->type != PORT_UNKNOWN && ser->type != PORT_ZS)
-		ret = -EINVAL;
-	if (ser->irq != uport->irq)
-		ret = -EINVAL;
-	if (ser->baud_base != uport->uartclk / zport->clk_mode / 4)
-		ret = -EINVAL;
-	return ret;
-}
-
-
-static struct uart_ops zs_ops = {
-	.tx_empty	= zs_tx_empty,
-	.set_mctrl	= zs_set_mctrl,
-	.get_mctrl	= zs_get_mctrl,
-	.stop_tx	= zs_stop_tx,
-	.start_tx	= zs_start_tx,
-	.stop_rx	= zs_stop_rx,
-	.enable_ms	= zs_enable_ms,
-	.break_ctl	= zs_break_ctl,
-	.startup	= zs_startup,
-	.shutdown	= zs_shutdown,
-	.set_termios	= zs_set_termios,
-	.pm		= zs_pm,
-	.type		= zs_type,
-	.release_port	= zs_release_port,
-	.request_port	= zs_request_port,
-	.config_port	= zs_config_port,
-	.verify_port	= zs_verify_port,
-};
-
-/*
- * Initialize Z85C30 port structures.
- */
-static int __init zs_probe_sccs(void)
-{
-	static int probed;
-	struct zs_parms zs_parms;
-	int chip, side, irq;
-	int n_chips = 0;
-	int i;
-
-	if (probed)
-		return 0;
-
-	irq = dec_interrupt[DEC_IRQ_SCC0];
-	if (irq >= 0) {
-		zs_parms.scc[n_chips] = IOASIC_SCC0;
-		zs_parms.irq[n_chips] = dec_interrupt[DEC_IRQ_SCC0];
-		n_chips++;
-	}
-	irq = dec_interrupt[DEC_IRQ_SCC1];
-	if (irq >= 0) {
-		zs_parms.scc[n_chips] = IOASIC_SCC1;
-		zs_parms.irq[n_chips] = dec_interrupt[DEC_IRQ_SCC1];
-		n_chips++;
-	}
-	if (!n_chips)
-		return -ENXIO;
-
-	probed = 1;
-
-	for (chip = 0; chip < n_chips; chip++) {
-		spin_lock_init(&zs_sccs[chip].zlock);
-		for (side = 0; side < ZS_NUM_CHAN; side++) {
-			struct zs_port *zport = &zs_sccs[chip].zport[side];
-			struct uart_port *uport = &zport->port;
-
-			zport->scc	= &zs_sccs[chip];
-			zport->clk_mode	= 16;
-
-			uport->irq	= zs_parms.irq[chip];
-			uport->uartclk	= ZS_CLOCK;
-			uport->fifosize	= 1;
-			uport->iotype	= UPIO_MEM;
-			uport->flags	= UPF_BOOT_AUTOCONF;
-			uport->ops	= &zs_ops;
-			uport->line	= chip * ZS_NUM_CHAN + side;
-			uport->mapbase	= dec_kn_slot_base +
-					  zs_parms.scc[chip] +
-					  (side ^ ZS_CHAN_B) * ZS_CHAN_IO_SIZE;
-
-			for (i = 0; i < ZS_NUM_REGS; i++)
-				zport->regs[i] = zs_init_regs[i];
-		}
-	}
-
-	return 0;
-}
-
-
-#ifdef CONFIG_SERIAL_ZS_CONSOLE
-static void zs_console_putchar(struct uart_port *uport, int ch)
-{
-	struct zs_port *zport = to_zport(uport);
-	struct zs_scc *scc = zport->scc;
-	int irq;
-	unsigned long flags;
-
-	spin_lock_irqsave(&scc->zlock, flags);
-	irq = !irqs_disabled_flags(flags);
-	if (zs_transmit_drain(zport, irq))
-		write_zsdata(zport, ch);
-	spin_unlock_irqrestore(&scc->zlock, flags);
-}
-
-/*
- * Print a string to the serial port trying not to disturb
- * any possible real use of the port...
- */
-static void zs_console_write(struct console *co, const char *s,
-			     unsigned int count)
-{
-	int chip = co->index / ZS_NUM_CHAN, side = co->index % ZS_NUM_CHAN;
-	struct zs_port *zport = &zs_sccs[chip].zport[side];
-	struct zs_scc *scc = zport->scc;
-	unsigned long flags;
-	u8 txint, txenb;
-	int irq;
-
-	/* Disable transmit interrupts and enable the transmitter. */
-	spin_lock_irqsave(&scc->zlock, flags);
-	txint = zport->regs[1];
-	txenb = zport->regs[5];
-	if (txint & TxINT_ENAB) {
-		zport->regs[1] = txint & ~TxINT_ENAB;
-		write_zsreg(zport, R1, zport->regs[1]);
-	}
-	if (!(txenb & TxENAB)) {
-		zport->regs[5] = txenb | TxENAB;
-		write_zsreg(zport, R5, zport->regs[5]);
-	}
-	spin_unlock_irqrestore(&scc->zlock, flags);
-
-	uart_console_write(&zport->port, s, count, zs_console_putchar);
-
-	/* Restore transmit interrupts and the transmitter enable. */
-	spin_lock_irqsave(&scc->zlock, flags);
-	irq = !irqs_disabled_flags(flags);
-	zs_line_drain(zport, irq);
-	if (!(txenb & TxENAB)) {
-		zport->regs[5] &= ~TxENAB;
-		write_zsreg(zport, R5, zport->regs[5]);
-	}
-	if (txint & TxINT_ENAB) {
-		zport->regs[1] |= TxINT_ENAB;
-		write_zsreg(zport, R1, zport->regs[1]);
-	}
-	spin_unlock_irqrestore(&scc->zlock, flags);
-}
-
-/*
- * Setup serial console baud/bits/parity.  We do two things here:
- * - construct a cflag setting for the first uart_open()
- * - initialise the serial port
- * Return non-zero if we didn't find a serial port.
- */
-static int __init zs_console_setup(struct console *co, char *options)
-{
-	int chip = co->index / ZS_NUM_CHAN, side = co->index % ZS_NUM_CHAN;
-	struct zs_port *zport = &zs_sccs[chip].zport[side];
-	struct uart_port *uport = &zport->port;
-	int baud = 9600;
-	int bits = 8;
-	int parity = 'n';
-	int flow = 'n';
-	int ret;
-
-	ret = zs_map_port(uport);
-	if (ret)
-		return ret;
-
-	zs_reset(zport);
-	zs_pm(uport, 0, -1);
-
-	if (options)
-		uart_parse_options(options, &baud, &parity, &bits, &flow);
-	return uart_set_options(uport, co, baud, parity, bits, flow);
-}
-
-static struct uart_driver zs_reg;
-static struct console zs_console = {
-	.name	= "ttyS",
-	.write	= zs_console_write,
-	.device	= uart_console_device,
-	.setup	= zs_console_setup,
-	.flags	= CON_PRINTBUFFER,
-	.index	= -1,
-	.data	= &zs_reg,
-};
-
-/*
- *	Register console.
- */
-static int __init zs_serial_console_init(void)
-{
-	int ret;
-
-	ret = zs_probe_sccs();
-	if (ret)
-		return ret;
-	register_console(&zs_console);
-
-	return 0;
-}
-
-console_initcall(zs_serial_console_init);
-
-#define SERIAL_ZS_CONSOLE	&zs_console
-#else
-#define SERIAL_ZS_CONSOLE	NULL
-#endif /* CONFIG_SERIAL_ZS_CONSOLE */
-
-static struct uart_driver zs_reg = {
-	.owner			= THIS_MODULE,
-	.driver_name		= "serial",
-	.dev_name		= "ttyS",
-	.major			= TTY_MAJOR,
-	.minor			= 64,
-	.nr			= ZS_NUM_SCCS * ZS_NUM_CHAN,
-	.cons			= SERIAL_ZS_CONSOLE,
-};
-
-/* zs_init inits the driver. */
-static int __init zs_init(void)
-{
-	int i, ret;
-
-	pr_info("%s%s\n", zs_name, zs_version);
-
-	/* Find out how many Z85C30 SCCs we have.  */
-	ret = zs_probe_sccs();
-	if (ret)
-		return ret;
-
-	ret = uart_register_driver(&zs_reg);
-	if (ret)
-		return ret;
-
-	for (i = 0; i < ZS_NUM_SCCS * ZS_NUM_CHAN; i++) {
-		struct zs_scc *scc = &zs_sccs[i / ZS_NUM_CHAN];
-		struct zs_port *zport = &scc->zport[i % ZS_NUM_CHAN];
-		struct uart_port *uport = &zport->port;
-
-		if (zport->scc)
-			uart_add_one_port(&zs_reg, uport);
-	}
-
-	return 0;
-}
-
-static void __exit zs_exit(void)
-{
-	int i;
-
-	for (i = ZS_NUM_SCCS * ZS_NUM_CHAN - 1; i >= 0; i--) {
-		struct zs_scc *scc = &zs_sccs[i / ZS_NUM_CHAN];
-		struct zs_port *zport = &scc->zport[i % ZS_NUM_CHAN];
-		struct uart_port *uport = &zport->port;
-
-		if (zport->scc)
-			uart_remove_one_port(&zs_reg, uport);
-	}
-
-	uart_unregister_driver(&zs_reg);
-}
-
-module_init(zs_init);
-module_exit(zs_exit);