patch-2.1.51 linux/drivers/macintosh/macserial.c

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diff -u --recursive --new-file v2.1.50/linux/drivers/macintosh/macserial.c linux/drivers/macintosh/macserial.c
@@ -0,0 +1,1923 @@
+/*
+ * macserial.c: Serial port driver for Power Macintoshes.
+ *
+ * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
+ *
+ * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/prom.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/bitops.h>
+
+#include "macserial.h"
+
+/*
+ * It would be nice to dynamically allocate everything that
+ * depends on NUM_SERIAL, so we could support any number of
+ * Z8530s, but for now...
+ */
+#define NUM_SERIAL	2		/* Max number of ZS chips supported */
+#define NUM_CHANNELS	(NUM_SERIAL * 2)	/* 2 channels per chip */
+
+/* On PowerMacs, the hardware takes care of the SCC recovery time,
+   but we need the eieio to make sure that the accesses occur
+   in the order we want. */
+#define RECOVERY_DELAY	eieio()
+
+struct mac_zschannel *zs_kgdbchan;
+struct mac_zschannel zs_channels[NUM_CHANNELS];
+
+struct mac_serial zs_soft[NUM_CHANNELS];
+int zs_channels_found;
+struct mac_serial *zs_chain;	/* list of all channels */
+
+struct tty_struct zs_ttys[NUM_CHANNELS];
+/** struct tty_struct *zs_constty; **/
+
+/* Console hooks... */
+static int zs_cons_chan = 0;
+struct mac_serial *zs_consinfo = 0;
+struct mac_zschannel *zs_conschan;
+
+/*
+ * Initialization values for when a channel is used for
+ * kernel gdb support.
+ */
+static unsigned char kgdb_regs[16] = {
+	0, 0, 0,		/* write 0, 1, 2 */
+	(Rx8 | RxENABLE),	/* write 3 */
+	(X16CLK | SB1),		/* write 4 */
+	(Tx8 | TxENAB | RTS),	/* write 5 */
+	0, 0, 0,		/* write 6, 7, 8 */
+	(NV),			/* write 9 */
+	(NRZ),			/* write 10 */
+	(TCBR | RCBR),		/* write 11 */
+	1, 0,			/* 38400 baud divisor, write 12 + 13 */
+	(BRENABL),		/* write 14 */
+	(DCDIE)			/* write 15 */
+};
+
+#define ZS_CLOCK         3686400 	/* Z8530 RTxC input clock rate */
+
+DECLARE_TASK_QUEUE(tq_serial);
+
+struct tty_driver serial_driver, callout_driver;
+static int serial_refcount;
+
+/* serial subtype definitions */
+#define SERIAL_TYPE_NORMAL	1
+#define SERIAL_TYPE_CALLOUT	2
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/* Debugging... DEBUG_INTR is bad to use when one of the zs
+ * lines is your console ;(
+ */
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+
+#define RS_STROBE_TIME 10
+#define RS_ISR_PASS_LIMIT 256
+
+#define _INLINE_ inline
+
+static void probe_sccs(void);
+static void change_speed(struct mac_serial *info);
+
+static struct tty_struct *serial_table[NUM_CHANNELS];
+static struct termios *serial_termios[NUM_CHANNELS];
+static struct termios *serial_termios_locked[NUM_CHANNELS];
+
+#ifndef MIN
+#define MIN(a,b)	((a) < (b) ? (a) : (b))
+#endif
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write.  We need to
+ * lock it in case the copy_from_user blocks while swapping in a page,
+ * and some other program tries to do a serial write at the same time.
+ * Since the lock will only come under contention when the system is
+ * swapping and available memory is low, it makes sense to share one
+ * buffer across all the serial ports, since it significantly saves
+ * memory if large numbers of serial ports are open.
+ */
+static unsigned char tmp_buf[4096]; /* This is cheating */
+static struct semaphore tmp_buf_sem = MUTEX;
+
+static inline int serial_paranoia_check(struct mac_serial *info,
+					dev_t device, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+	static const char *badmagic =
+		"Warning: bad magic number for serial struct (%d, %d) in %s\n";
+	static const char *badinfo =
+		"Warning: null mac_serial for (%d, %d) in %s\n";
+
+	if (!info) {
+		printk(badinfo, MAJOR(device), MINOR(device), routine);
+		return 1;
+	}
+	if (info->magic != SERIAL_MAGIC) {
+		printk(badmagic, MAJOR(device), MINOR(device), routine);
+		return 1;
+	}
+#endif
+	return 0;
+}
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts
+ */
+static int baud_table[] = {
+	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+	9600, 19200, 38400, 57600, 115200, 230400, 0 };
+
+/* 
+ * Reading and writing Z8530 registers.
+ */
+static inline unsigned char read_zsreg(struct mac_zschannel *channel,
+				       unsigned char reg)
+{
+	unsigned char retval;
+
+	if (reg != 0) {
+		*channel->control = reg;
+		RECOVERY_DELAY;
+	}
+	retval = *channel->control;
+	RECOVERY_DELAY;
+	return retval;
+}
+
+static inline void write_zsreg(struct mac_zschannel *channel,
+			       unsigned char reg, unsigned char value)
+{
+	if (reg != 0) {
+		*channel->control = reg;
+		RECOVERY_DELAY;
+	}
+	*channel->control = value;
+	RECOVERY_DELAY;
+	return;
+}
+
+static inline unsigned char read_zsdata(struct mac_zschannel *channel)
+{
+	unsigned char retval;
+
+	retval = *channel->data;
+	RECOVERY_DELAY;
+	return retval;
+}
+
+static inline void write_zsdata(struct mac_zschannel *channel,
+				unsigned char value)
+{
+	*channel->data = value;
+	RECOVERY_DELAY;
+	return;
+}
+
+static inline void load_zsregs(struct mac_zschannel *channel,
+			       unsigned char *regs)
+{
+	ZS_CLEARERR(channel);
+	ZS_CLEARFIFO(channel);
+	/* Load 'em up */
+	write_zsreg(channel, R4, regs[R4]);
+	write_zsreg(channel, R10, regs[R10]);
+	write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
+	write_zsreg(channel, R5, regs[R5] & ~TxENAB);
+	write_zsreg(channel, R1, regs[R1]);
+	write_zsreg(channel, R9, regs[R9]);
+	write_zsreg(channel, R11, regs[R11]);
+	write_zsreg(channel, R12, regs[R12]);
+	write_zsreg(channel, R13, regs[R13]);
+	write_zsreg(channel, R14, regs[R14]);
+	write_zsreg(channel, R15, regs[R15]);
+	write_zsreg(channel, R3, regs[R3]);
+	write_zsreg(channel, R5, regs[R5]);
+	return;
+}
+
+/* Sets or clears DTR/RTS on the requested line */
+static inline void zs_rtsdtr(struct mac_serial *ss, int set)
+{
+	if (set)
+		ss->curregs[5] |= (RTS | DTR);
+	else
+		ss->curregs[5] &= ~(RTS | DTR);
+	write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
+	return;
+}
+
+static inline void kgdb_chaninit(struct mac_serial *ss, int intson, int bps)
+{
+	int brg;
+
+	if (intson) {
+		kgdb_regs[R1] = INT_ALL_Rx;
+		kgdb_regs[R9] |= MIE;
+	} else {
+		kgdb_regs[R1] = 0;
+		kgdb_regs[R9] &= ~MIE;
+	}
+	brg = BPS_TO_BRG(bps, ZS_CLOCK/16);
+	kgdb_regs[R12] = brg;
+	kgdb_regs[R13] = brg >> 8;
+	load_zsregs(ss->zs_channel, kgdb_regs);
+}
+
+/* Utility routines for the Zilog */
+static inline int get_zsbaud(struct mac_serial *ss)
+{
+	struct mac_zschannel *channel = ss->zs_channel;
+	int brg;
+
+	if ((ss->curregs[R11] & TCBR) == 0) {
+		/* higher rates don't use the baud rate generator */
+		return (ss->curregs[R4] & X32CLK)? ZS_CLOCK/32: ZS_CLOCK/16;
+	}
+	/* The baud rate is split up between two 8-bit registers in
+	 * what is termed 'BRG time constant' format in my docs for
+	 * the chip, it is a function of the clk rate the chip is
+	 * receiving which happens to be constant.
+	 */
+	brg = (read_zsreg(channel, 13) << 8);
+	brg |= read_zsreg(channel, 12);
+	return BRG_TO_BPS(brg, (ZS_CLOCK/(ss->clk_divisor)));
+}
+
+/* On receive, this clears errors and the receiver interrupts */
+static inline void rs_recv_clear(struct mac_zschannel *zsc)
+{
+	write_zsreg(zsc, 0, ERR_RES);
+	write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines.  All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt().  They were separated out for readability's sake.
+ *
+ * 				- Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static _INLINE_ void rs_sched_event(struct mac_serial *info,
+				  int event)
+{
+	info->event |= 1 << event;
+	queue_task(&info->tqueue, &tq_serial);
+	mark_bh(SERIAL_BH);
+}
+
+extern void breakpoint(void);  /* For the KGDB frame character */
+
+static _INLINE_ void receive_chars(struct mac_serial *info,
+				   struct pt_regs *regs)
+{
+	struct tty_struct *tty = info->tty;
+	unsigned char ch, stat, flag;
+
+	while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) != 0) {
+
+		stat = read_zsreg(info->zs_channel, R1);
+		ch = read_zsdata(info->zs_channel);
+
+#if 0	/* KGDB not yet supported */
+		/* Look for kgdb 'stop' character, consult the gdb documentation
+		 * for remote target debugging and arch/sparc/kernel/sparc-stub.c
+		 * to see how all this works.
+		 */
+		if ((info->kgdb_channel) && (ch =='\003')) {
+			breakpoint();
+			continue;
+		}
+#endif
+
+		if (!tty)
+			continue;
+		queue_task(&tty->flip.tqueue, &tq_timer);
+
+		if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
+			static int flip_buf_ovf;
+			++flip_buf_ovf;
+			continue;
+		}
+		tty->flip.count++;
+		{
+			static int flip_max_cnt;
+			if (flip_max_cnt < tty->flip.count)
+				flip_max_cnt = tty->flip.count;
+		}
+		if (stat & Rx_OVR) {
+			flag = TTY_OVERRUN;
+			/* reset the error indication */
+			write_zsreg(info->zs_channel, 0, ERR_RES);
+		} else if (stat & FRM_ERR) {
+			/* this error is not sticky */
+			flag = TTY_FRAME;
+		} else if (stat & PAR_ERR) {
+			flag = TTY_PARITY;
+			/* reset the error indication */
+			write_zsreg(info->zs_channel, 0, ERR_RES);
+		} else
+			flag = 0;
+		*tty->flip.flag_buf_ptr++ = flag;
+		*tty->flip.char_buf_ptr++ = ch;
+	}
+}
+
+static void transmit_chars(struct mac_serial *info)
+{
+	if ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0)
+		return;
+	info->tx_active = 0;
+
+	if (info->x_char) {
+		/* Send next char */
+		write_zsdata(info->zs_channel, info->x_char);
+		info->x_char = 0;
+		info->tx_active = 1;
+		return;
+	}
+
+	if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tx_stopped) {
+		write_zsreg(info->zs_channel, 0, RES_Tx_P);
+		return;
+	}
+
+	/* Send char */
+	write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
+	info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+	info->xmit_cnt--;
+	info->tx_active = 1;
+
+	if (info->xmit_cnt < WAKEUP_CHARS)
+		rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+}
+
+static _INLINE_ void status_handle(struct mac_serial *info)
+{
+	unsigned char status;
+
+	/* Get status from Read Register 0 */
+	status = read_zsreg(info->zs_channel, 0);
+
+	/* Check for DCD transitions */
+	if (((status ^ info->read_reg_zero) & DCD) != 0
+	    && info->tty && !C_CLOCAL(info->tty)) {
+		if (status & DCD) {
+			wake_up_interruptible(&info->open_wait);
+		} else if (!(info->flags & ZILOG_CALLOUT_ACTIVE)) {
+			queue_task(&info->tqueue_hangup, &tq_scheduler);
+		}
+	}
+
+	/* Check for CTS transitions */
+	if (info->tty && C_CRTSCTS(info->tty)) {
+		/*
+		 * For some reason, on the Power Macintosh,
+		 * it seems that the CTS bit is 1 when CTS is
+		 * *negated* and 0 when it is asserted.
+		 * The DCD bit doesn't seem to be inverted
+		 * like this.
+		 */
+		if ((status & CTS) == 0) {
+			if (info->tx_stopped) {
+				info->tx_stopped = 0;
+				if (!info->tx_active)
+					transmit_chars(info);
+			}
+		} else {
+			info->tx_stopped = 1;
+		}
+	}
+
+	/* Clear status condition... */
+	write_zsreg(info->zs_channel, 0, RES_EXT_INT);
+	info->read_reg_zero = status;
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+	struct mac_serial *info = (struct mac_serial *) dev_id;
+	unsigned char zs_intreg;
+	int shift;
+
+	/* 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...
+	 */
+#define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
+
+	if (info->zs_chan_a == info->zs_channel)
+		shift = 3;	/* Channel A */
+	else
+		shift = 0;	/* Channel B */
+
+	for (;;) {
+		zs_intreg = read_zsreg(info->zs_chan_a, 3) >> shift;
+		if ((zs_intreg & CHAN_IRQMASK) == 0)
+			break;
+
+		if (zs_intreg & CHBRxIP)
+			receive_chars(info, regs);
+		if (zs_intreg & CHBTxIP)
+			transmit_chars(info);
+		if (zs_intreg & CHBEXT)
+			status_handle(info);
+	}
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * ------------------------------------------------------------
+ */
+static void rs_stop(struct tty_struct *tty)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+
+	if (serial_paranoia_check(info, tty->device, "rs_stop"))
+		return;
+	
+#if 0
+	save_flags(flags); cli();
+	if (info->curregs[5] & TxENAB) {
+		info->curregs[5] &= ~TxENAB;
+		info->pendregs[5] &= ~TxENAB;
+		write_zsreg(info->zs_channel, 5, info->curregs[5]);
+	}
+	restore_flags(flags);
+#endif
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+	unsigned long flags;
+	
+	if (serial_paranoia_check(info, tty->device, "rs_start"))
+		return;
+	
+	save_flags(flags); cli();
+#if 0
+	if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) {
+		info->curregs[5] |= TxENAB;
+		info->pendregs[5] = info->curregs[5];
+		write_zsreg(info->zs_channel, 5, info->curregs[5]);
+	}
+#else
+	if (info->xmit_cnt && info->xmit_buf && !info->tx_active) {
+		transmit_chars(info);
+	}
+#endif
+	restore_flags(flags);
+}
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+static void do_serial_bh(void)
+{
+	run_task_queue(&tq_serial);
+}
+
+static void do_softint(void *private_)
+{
+	struct mac_serial	*info = (struct mac_serial *) private_;
+	struct tty_struct	*tty;
+	
+	tty = info->tty;
+	if (!tty)
+		return;
+
+	if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
+		if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+		    tty->ldisc.write_wakeup)
+			(tty->ldisc.write_wakeup)(tty);
+		wake_up_interruptible(&tty->write_wait);
+	}
+}
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred.  The path of
+ * hangup processing is:
+ *
+ * 	serial interrupt routine -> (scheduler tqueue) ->
+ * 	do_serial_hangup() -> tty->hangup() -> rs_hangup()
+ * 
+ */
+static void do_serial_hangup(void *private_)
+{
+	struct mac_serial	*info = (struct mac_serial *) private_;
+	struct tty_struct	*tty;
+	
+	tty = info->tty;
+	if (!tty)
+		return;
+
+	tty_hangup(tty);
+}
+
+static void rs_timer(void)
+{
+}
+
+static int startup(struct mac_serial * info)
+{
+	unsigned long flags;
+
+	if (info->flags & ZILOG_INITIALIZED)
+		return 0;
+
+	if (!info->xmit_buf) {
+		info->xmit_buf = (unsigned char *) get_free_page(GFP_KERNEL);
+		if (!info->xmit_buf)
+			return -ENOMEM;
+	}
+
+	save_flags(flags); cli();
+
+#ifdef SERIAL_DEBUG_OPEN
+	printk("starting up ttyS%d (irq %d)...", info->line, info->irq);
+#endif
+
+	/*
+	 * Clear the receive FIFO.
+	 */
+	ZS_CLEARFIFO(info->zs_channel);
+	info->xmit_fifo_size = 1;
+
+	/*
+	 * Clear the interrupt registers.
+	 */
+	write_zsreg(info->zs_channel, 0, ERR_RES);
+	write_zsreg(info->zs_channel, 0, RES_H_IUS);
+
+	/*
+	 * Turn on RTS and DTR.
+	 */
+	zs_rtsdtr(info, 1);
+
+	/*
+	 * Finally, enable sequencing and interrupts
+	 */
+	info->curregs[1] = (info->curregs[1] & ~0x18) | (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB);
+	info->pendregs[1] = info->curregs[1];
+	info->curregs[3] |= (RxENABLE | Rx8);
+	info->pendregs[3] = info->curregs[3];
+	info->curregs[5] |= (TxENAB | Tx8);
+	info->pendregs[5] = info->curregs[5];
+	info->curregs[9] |= (NV | MIE);
+	info->pendregs[9] = info->curregs[9];
+	write_zsreg(info->zs_channel, 3, info->curregs[3]);
+	write_zsreg(info->zs_channel, 5, info->curregs[5]);
+	write_zsreg(info->zs_channel, 9, info->curregs[9]);
+
+	if (info->tty)
+		clear_bit(TTY_IO_ERROR, &info->tty->flags);
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+	/*
+	 * Set the speed of the serial port
+	 */
+	change_speed(info);
+
+	/* Save the current value of RR0 */
+	info->read_reg_zero = read_zsreg(info->zs_channel, 0);
+
+	info->flags |= ZILOG_INITIALIZED;
+	restore_flags(flags);
+	return 0;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void shutdown(struct mac_serial * info)
+{
+	unsigned long	flags;
+
+	if (!(info->flags & ZILOG_INITIALIZED))
+		return;
+
+#ifdef SERIAL_DEBUG_OPEN
+	printk("Shutting down serial port %d (irq %d)....", info->line,
+	       info->irq);
+#endif
+	
+	save_flags(flags); cli(); /* Disable interrupts */
+	
+	if (info->xmit_buf) {
+		free_page((unsigned long) info->xmit_buf);
+		info->xmit_buf = 0;
+	}
+
+	info->pendregs[1] = info->curregs[1] = 0;
+	write_zsreg(info->zs_channel, 1, 0);	/* no interrupts */
+
+	info->curregs[3] &= ~RxENABLE;
+	info->pendregs[3] = info->curregs[3];
+	write_zsreg(info->zs_channel, 3, info->curregs[3]);
+
+	info->curregs[5] &= ~TxENAB;
+	if (!info->tty || C_HUPCL(info->tty))
+		info->curregs[5] &= ~(DTR | RTS);
+	info->pendregs[5] = info->curregs[5];
+	write_zsreg(info->zs_channel, 5, info->curregs[5]);
+
+	if (info->tty)
+		set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+	info->flags &= ~ZILOG_INITIALIZED;
+	restore_flags(flags);
+}
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void change_speed(struct mac_serial *info)
+{
+	unsigned short port;
+	unsigned cflag;
+	int	i;
+	int	brg;
+	unsigned long flags;
+
+	if (!info->tty || !info->tty->termios)
+		return;
+	cflag = info->tty->termios->c_cflag;
+	if (!(port = info->port))
+		return;
+	i = cflag & CBAUD;
+
+	save_flags(flags); cli();
+	info->zs_baud = baud_table[i];
+	info->clk_divisor = 16;
+
+	switch (info->zs_baud) {
+	case ZS_CLOCK/16:	/* 230400 */
+		info->curregs[4] = X16CLK;
+		info->curregs[11] = 0;
+		break;
+	case ZS_CLOCK/32:	/* 115200 */
+		info->curregs[4] = X32CLK;
+		info->curregs[11] = 0;
+		break;
+	default:
+		info->curregs[4] = X16CLK;
+		info->curregs[11] = TCBR | RCBR;
+		brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor);
+		info->curregs[12] = (brg & 255);
+		info->curregs[13] = ((brg >> 8) & 255);
+		info->curregs[14] = BRENABL;
+	}
+
+	/* byte size and parity */
+	info->curregs[3] &= ~RxNBITS_MASK;
+	info->curregs[5] &= ~TxNBITS_MASK;
+	switch (cflag & CSIZE) {
+	case CS5:
+		info->curregs[3] |= Rx5;
+		info->curregs[5] |= Tx5;
+		break;
+	case CS6:
+		info->curregs[3] |= Rx6;
+		info->curregs[5] |= Tx6;
+		break;
+	case CS7:
+		info->curregs[3] |= Rx7;
+		info->curregs[5] |= Tx7;
+		break;
+	case CS8:
+	default: /* defaults to 8 bits */
+		info->curregs[3] |= Rx8;
+		info->curregs[5] |= Tx8;
+		break;
+	}
+	info->pendregs[3] = info->curregs[3];
+	info->pendregs[5] = info->curregs[5];
+
+	info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
+	if (cflag & CSTOPB) {
+		info->curregs[4] |= SB2;
+	} else {
+		info->curregs[4] |= SB1;
+	}
+	if (cflag & PARENB) {
+		info->curregs[4] |= PAR_ENA;
+	}
+	if (!(cflag & PARODD)) {
+		info->curregs[4] |= PAR_EVEN;
+	}
+	info->pendregs[4] = info->curregs[4];
+
+	if (!(cflag & CLOCAL)) {
+		if (!(info->curregs[15] & DCDIE))
+			info->read_reg_zero = read_zsreg(info->zs_channel, 0);
+		info->curregs[15] |= DCDIE;
+	} else
+		info->curregs[15] &= ~DCDIE;
+	if (cflag & CRTSCTS) {
+		info->curregs[15] |= CTSIE;
+		if ((read_zsreg(info->zs_channel, 0) & CTS) != 0)
+			info->tx_stopped = 1;
+	} else {
+		info->curregs[15] &= ~CTSIE;
+		info->tx_stopped = 0;
+	}
+	info->pendregs[15] = info->curregs[15];
+
+	/* Load up the new values */
+	load_zsregs(info->zs_channel, info->curregs);
+
+	restore_flags(flags);
+}
+
+/* This is for console output over ttya/ttyb */
+static void rs_put_char(char ch)
+{
+	struct mac_zschannel *chan = zs_conschan;
+	int loops = 0;
+	unsigned long flags;
+
+	if(!chan)
+		return;
+
+	save_flags(flags); cli();
+	while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0)
+		if (++loops >= 1000000)
+			break;
+	write_zsdata(chan, ch);
+	restore_flags(flags);
+}
+
+/* These are for receiving and sending characters under the kgdb
+ * source level kernel debugger.
+ */
+void putDebugChar(char kgdb_char)
+{
+	struct mac_zschannel *chan = zs_kgdbchan;
+
+	while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0)
+		udelay(5);
+	write_zsdata(chan, kgdb_char);
+}
+
+char getDebugChar(void)
+{
+	struct mac_zschannel *chan = zs_kgdbchan;
+
+	while ((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
+		udelay(5);
+	return read_zsdata(chan);
+}
+
+/*
+ * Fair output driver allows a process to speak.
+ */
+static void rs_fair_output(void)
+{
+	int left;		/* Output no more than that */
+	unsigned long flags;
+	struct mac_serial *info = zs_consinfo;
+	char c;
+
+	if (info == 0) return;
+	if (info->xmit_buf == 0) return;
+
+	save_flags(flags);  cli();
+	left = info->xmit_cnt;
+	while (left != 0) {
+		c = info->xmit_buf[info->xmit_tail];
+		info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
+		info->xmit_cnt--;
+		restore_flags(flags);
+
+		rs_put_char(c);
+
+		save_flags(flags);  cli();
+		left = MIN(info->xmit_cnt, left-1);
+	}
+
+	restore_flags(flags);
+	return;
+}
+
+/*
+ * zs_console_print is registered for printk.
+ */
+static void zs_console_print(const char *p)
+{
+	char c;
+
+	while ((c = *(p++)) != 0) {
+		if (c == '\n')
+			rs_put_char('\r');
+		rs_put_char(c);
+	}
+
+	/* Comment this if you want to have a strict interrupt-driven output */
+	rs_fair_output();
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+	unsigned long flags;
+
+	if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
+		return;
+
+	if (info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped ||
+	    !info->xmit_buf)
+		return;
+
+	/* Enable transmitter */
+	save_flags(flags); cli();
+	transmit_chars(info);
+	restore_flags(flags);
+}
+
+static int rs_write(struct tty_struct * tty, int from_user,
+		    const unsigned char *buf, int count)
+{
+	int	c, total = 0;
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+	unsigned long flags;
+
+	if (serial_paranoia_check(info, tty->device, "rs_write"))
+		return 0;
+
+	if (!tty || !info->xmit_buf)
+		return 0;
+
+	save_flags(flags);
+	while (1) {
+		cli();		
+		c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+				   SERIAL_XMIT_SIZE - info->xmit_head));
+		if (c <= 0)
+			break;
+
+		if (from_user) {
+			down(&tmp_buf_sem);
+			copy_from_user(tmp_buf, buf, c);
+			c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+				       SERIAL_XMIT_SIZE - info->xmit_head));
+			memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
+			up(&tmp_buf_sem);
+		} else
+			memcpy(info->xmit_buf + info->xmit_head, buf, c);
+		info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
+		info->xmit_cnt += c;
+		restore_flags(flags);
+		buf += c;
+		count -= c;
+		total += c;
+	}
+	if (info->xmit_cnt && !tty->stopped && !info->tx_stopped
+	    && !info->tx_active)
+		transmit_chars(info);
+	restore_flags(flags);
+	return total;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+	int	ret;
+				
+	if (serial_paranoia_check(info, tty->device, "rs_write_room"))
+		return 0;
+	ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+	if (ret < 0)
+		ret = 0;
+	return ret;
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+				
+	if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
+		return 0;
+	return info->xmit_cnt;
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+				
+	if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
+		return;
+	cli();
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+	sti();
+	wake_up_interruptible(&tty->write_wait);
+	if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+	    tty->ldisc.write_wakeup)
+		(tty->ldisc.write_wakeup)(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ * 
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_throttle(struct tty_struct * tty)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+	unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+	char	buf[64];
+	
+	printk("throttle %s: %d....\n", _tty_name(tty, buf),
+	       tty->ldisc.chars_in_buffer(tty));
+#endif
+
+	if (serial_paranoia_check(info, tty->device, "rs_throttle"))
+		return;
+	
+	if (I_IXOFF(tty)) {
+		save_flags(flags); cli();
+		info->x_char = STOP_CHAR(tty);
+		if (!info->tx_active)
+			transmit_chars(info);
+		restore_flags(flags);
+	}
+
+	if (C_CRTSCTS(tty)) {
+		/*
+		 * Here we want to turn off the RTS line.  On Macintoshes,
+		 * we only get the DTR line, which goes to both DTR and
+		 * RTS on the modem.  RTS doesn't go out to the serial
+		 * port socket.  So you should make sure your modem is
+		 * set to ignore DTR if you're using CRTSCTS.
+		 */
+		save_flags(flags); cli();
+		info->curregs[5] &= ~(DTR | RTS);
+		info->pendregs[5] &= ~(DTR | RTS);
+		write_zsreg(info->zs_channel, 5, info->curregs[5]);
+		restore_flags(flags);
+	}
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+	unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+	char	buf[64];
+	
+	printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
+	       tty->ldisc.chars_in_buffer(tty));
+#endif
+
+	if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
+		return;
+	
+	if (I_IXOFF(tty)) {
+		save_flags(flags); cli();
+		if (info->x_char)
+			info->x_char = 0;
+		else {
+			info->x_char = START_CHAR(tty);
+			if (!info->tx_active)
+				transmit_chars(info);
+		}
+		restore_flags(flags);
+	}
+
+	if (C_CRTSCTS(tty)) {
+		/* Assert RTS and DTR lines */
+		save_flags(flags); cli();
+		info->curregs[5] |= DTR | RTS;
+		info->pendregs[5] |= DTR | RTS;
+		write_zsreg(info->zs_channel, 5, info->curregs[5]);
+		restore_flags(flags);
+	}
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct mac_serial * info,
+			   struct serial_struct * retinfo)
+{
+	struct serial_struct tmp;
+  
+	if (!retinfo)
+		return -EFAULT;
+	memset(&tmp, 0, sizeof(tmp));
+	tmp.type = info->type;
+	tmp.line = info->line;
+	tmp.port = info->port;
+	tmp.irq = info->irq;
+	tmp.flags = info->flags;
+	tmp.baud_base = info->baud_base;
+	tmp.close_delay = info->close_delay;
+	tmp.closing_wait = info->closing_wait;
+	tmp.custom_divisor = info->custom_divisor;
+	return copy_to_user(retinfo,&tmp,sizeof(*retinfo));
+}
+
+static int set_serial_info(struct mac_serial * info,
+			   struct serial_struct * new_info)
+{
+	struct serial_struct new_serial;
+	struct mac_serial old_info;
+	int 			retval = 0;
+
+	if (!new_info)
+		return -EFAULT;
+	copy_from_user(&new_serial,new_info,sizeof(new_serial));
+	old_info = *info;
+
+	if (!suser()) {
+		if ((new_serial.baud_base != info->baud_base) ||
+		    (new_serial.type != info->type) ||
+		    (new_serial.close_delay != info->close_delay) ||
+		    ((new_serial.flags & ~ZILOG_USR_MASK) !=
+		     (info->flags & ~ZILOG_USR_MASK)))
+			return -EPERM;
+		info->flags = ((info->flags & ~ZILOG_USR_MASK) |
+			       (new_serial.flags & ZILOG_USR_MASK));
+		info->custom_divisor = new_serial.custom_divisor;
+		goto check_and_exit;
+	}
+
+	if (info->count > 1)
+		return -EBUSY;
+
+	/*
+	 * OK, past this point, all the error checking has been done.
+	 * At this point, we start making changes.....
+	 */
+
+	info->baud_base = new_serial.baud_base;
+	info->flags = ((info->flags & ~ZILOG_FLAGS) |
+			(new_serial.flags & ZILOG_FLAGS));
+	info->type = new_serial.type;
+	info->close_delay = new_serial.close_delay;
+	info->closing_wait = new_serial.closing_wait;
+
+check_and_exit:
+	retval = startup(info);
+	return retval;
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * 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 int get_lsr_info(struct mac_serial * info, unsigned int *value)
+{
+	unsigned char status;
+
+	cli();
+	status = read_zsreg(info->zs_channel, 0);
+	sti();
+	put_user(status,value);
+	return 0;
+}
+
+static int get_modem_info(struct mac_serial *info, unsigned int *value)
+{
+	unsigned char control, status;
+	unsigned int result;
+
+	cli();
+	control = info->curregs[5];
+	status = read_zsreg(info->zs_channel, 0);
+	sti();
+	result =  ((control & RTS) ? TIOCM_RTS: 0)
+		| ((control & DTR) ? TIOCM_DTR: 0)
+		| ((status  & DCD) ? TIOCM_CAR: 0)
+		| ((status  & CTS) ? 0: TIOCM_CTS);
+	put_user(result,value);
+	return 0;
+}
+
+static int set_modem_info(struct mac_serial *info, unsigned int cmd,
+			  unsigned int *value)
+{
+	int error;
+	unsigned int arg, bits;
+
+	error = verify_area(VERIFY_READ, value, sizeof(int));
+	if (error)
+		return error;
+	get_user(arg, value);
+	bits = (arg & TIOCM_RTS? RTS: 0) + (arg & TIOCM_DTR? DTR: 0);
+	cli();
+	switch (cmd) {
+	case TIOCMBIS:
+		info->curregs[5] |= bits;
+		break;
+	case TIOCMBIC:
+		info->curregs[5] &= ~bits;
+		break;
+	case TIOCMSET:
+		info->curregs[5] = (info->curregs[5] & ~(DTR | RTS)) | bits;
+		break;
+	default:
+		sti();
+		return -EINVAL;
+	}
+	info->pendregs[5] = info->curregs[5];
+	write_zsreg(info->zs_channel, 5, info->curregs[5]);
+	sti();
+	return 0;
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break(	struct mac_serial * info, int duration)
+{
+	if (!info->port)
+		return;
+	current->state = TASK_INTERRUPTIBLE;
+	current->timeout = jiffies + duration;
+	cli();
+	info->curregs[5] |= SND_BRK;
+	write_zsreg(info->zs_channel, 5, info->curregs[5]);
+	schedule();
+	info->curregs[5] &= ~SND_BRK;
+	write_zsreg(info->zs_channel, 5, info->curregs[5]);
+	sti();
+}
+
+static int rs_ioctl(struct tty_struct *tty, struct file * file,
+		    unsigned int cmd, unsigned long arg)
+{
+	int error;
+	struct mac_serial * info = (struct mac_serial *)tty->driver_data;
+	int retval;
+
+	if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
+		return -ENODEV;
+
+	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+	    (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
+	    (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
+		if (tty->flags & (1 << TTY_IO_ERROR))
+		    return -EIO;
+	}
+	
+	switch (cmd) {
+		case TCSBRK:	/* SVID version: non-zero arg --> no break */
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+			tty_wait_until_sent(tty, 0);
+			if (!arg)
+				send_break(info, HZ/4);	/* 1/4 second */
+			return 0;
+		case TCSBRKP:	/* support for POSIX tcsendbreak() */
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+			tty_wait_until_sent(tty, 0);
+			send_break(info, arg ? arg*(HZ/10) : HZ/4);
+			return 0;
+		case TIOCGSOFTCAR:
+			return put_user(C_CLOCAL(tty) ? 1 : 0, (int *) arg);
+		case TIOCSSOFTCAR:
+			error = get_user(arg, (int *) arg);
+			if (error)
+				return error;
+			tty->termios->c_cflag =
+				((tty->termios->c_cflag & ~CLOCAL) |
+				 (arg ? CLOCAL : 0));
+			return 0;
+		case TIOCMGET:
+			error = verify_area(VERIFY_WRITE, (void *) arg,
+				sizeof(unsigned int));
+			if (error)
+				return error;
+			return get_modem_info(info, (unsigned int *) arg);
+		case TIOCMBIS:
+		case TIOCMBIC:
+		case TIOCMSET:
+			return set_modem_info(info, cmd, (unsigned int *) arg);
+		case TIOCGSERIAL:
+			error = verify_area(VERIFY_WRITE, (void *) arg,
+						sizeof(struct serial_struct));
+			if (error)
+				return error;
+			return get_serial_info(info,
+					       (struct serial_struct *) arg);
+		case TIOCSSERIAL:
+			return set_serial_info(info,
+					       (struct serial_struct *) arg);
+		case TIOCSERGETLSR: /* Get line status register */
+			error = verify_area(VERIFY_WRITE, (void *) arg,
+				sizeof(unsigned int));
+			if (error)
+				return error;
+			else
+			    return get_lsr_info(info, (unsigned int *) arg);
+
+		case TIOCSERGSTRUCT:
+			error = verify_area(VERIFY_WRITE, (void *) arg,
+						sizeof(struct mac_serial));
+			if (error)
+				return error;
+			copy_from_user((struct mac_serial *) arg,
+				       info, sizeof(struct mac_serial));
+			return 0;
+			
+		default:
+			return -ENOIOCTLCMD;
+		}
+	return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
+	int was_stopped;
+
+	if (tty->termios->c_cflag == old_termios->c_cflag)
+		return;
+	was_stopped = info->tx_stopped;
+
+	change_speed(info);
+
+	if (was_stopped && !info->tx_stopped)
+		rs_start(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_close()
+ * 
+ * This routine is called when the serial port gets closed.
+ * Wait for the last remaining data to be sent.
+ * ------------------------------------------------------------
+ */
+static void rs_close(struct tty_struct *tty, struct file * filp)
+{
+	struct mac_serial * info = (struct mac_serial *)tty->driver_data;
+	unsigned long flags;
+	unsigned long timeout;
+
+	if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
+		return;
+	
+	save_flags(flags); cli();
+	
+	if (tty_hung_up_p(filp)) {
+		restore_flags(flags);
+		return;
+	}
+	
+#ifdef SERIAL_DEBUG_OPEN
+	printk("rs_close ttys%d, count = %d\n", info->line, info->count);
+#endif
+	if ((tty->count == 1) && (info->count != 1)) {
+		/*
+		 * Uh, oh.  tty->count is 1, which means that the tty
+		 * structure will be freed.  Info->count should always
+		 * be one in these conditions.  If it's greater than
+		 * one, we've got real problems, since it means the
+		 * serial port won't be shutdown.
+		 */
+		printk("rs_close: bad serial port count; tty->count is 1, "
+		       "info->count is %d\n", info->count);
+		info->count = 1;
+	}
+	if (--info->count < 0) {
+		printk("rs_close: bad serial port count for ttys%d: %d\n",
+		       info->line, info->count);
+		info->count = 0;
+	}
+	if (info->count) {
+		restore_flags(flags);
+		return;
+	}
+	info->flags |= ZILOG_CLOSING;
+	/*
+	 * Save the termios structure, since this port may have
+	 * separate termios for callout and dialin.
+	 */
+	if (info->flags & ZILOG_NORMAL_ACTIVE)
+		info->normal_termios = *tty->termios;
+	if (info->flags & ZILOG_CALLOUT_ACTIVE)
+		info->callout_termios = *tty->termios;
+	/*
+	 * Now we wait for the transmit buffer to clear; and we notify 
+	 * the line discipline to only process XON/XOFF characters.
+	 */
+	tty->closing = 1;
+	if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE)
+		tty_wait_until_sent(tty, info->closing_wait);
+	/*
+	 * At this point we stop accepting input.  To do this, we
+	 * disable the receiver and receive interrupts.
+	 */
+	/** if (!info->iscons) ... **/
+	info->curregs[3] &= ~RxENABLE;
+	info->pendregs[3] = info->curregs[3];
+	write_zsreg(info->zs_channel, 3, info->curregs[3]);
+	info->curregs[1] &= ~(0x18);	/* disable any rx ints */
+	info->pendregs[1] = info->curregs[1];
+	write_zsreg(info->zs_channel, 1, info->curregs[1]);
+	ZS_CLEARFIFO(info->zs_channel);
+	if (info->flags & ZILOG_INITIALIZED) {
+		/*
+		 * Before we drop DTR, make sure the SCC transmitter
+		 * has completely drained.
+		 */
+		timeout = jiffies+HZ;
+		while ((read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) {
+			current->state = TASK_INTERRUPTIBLE;
+			current->timeout = jiffies + info->timeout;
+			schedule();
+			if (jiffies > timeout)
+				break;
+		}
+	}
+
+	shutdown(info);
+	if (tty->driver.flush_buffer)
+		tty->driver.flush_buffer(tty);
+	if (tty->ldisc.flush_buffer)
+		tty->ldisc.flush_buffer(tty);
+	tty->closing = 0;
+	info->event = 0;
+	info->tty = 0;
+	if (tty->ldisc.num != ldiscs[N_TTY].num) {
+		if (tty->ldisc.close)
+			(tty->ldisc.close)(tty);
+		tty->ldisc = ldiscs[N_TTY];
+		tty->termios->c_line = N_TTY;
+		if (tty->ldisc.open)
+			(tty->ldisc.open)(tty);
+	}
+	if (info->blocked_open) {
+		if (info->close_delay) {
+			current->state = TASK_INTERRUPTIBLE;
+			current->timeout = jiffies + info->close_delay;
+			schedule();
+		}
+		wake_up_interruptible(&info->open_wait);
+	}
+	info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE|
+			 ZILOG_CLOSING);
+	wake_up_interruptible(&info->close_wait);
+	restore_flags(flags);
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+void rs_hangup(struct tty_struct *tty)
+{
+	struct mac_serial * info = (struct mac_serial *)tty->driver_data;
+
+	if (serial_paranoia_check(info, tty->device, "rs_hangup"))
+		return;
+
+	rs_flush_buffer(tty);
+	shutdown(info);
+	info->event = 0;
+	info->count = 0;
+	info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE);
+	info->tty = 0;
+	wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+			   struct mac_serial *info)
+{
+	struct wait_queue wait = { current, NULL };
+	int		retval;
+	int		do_clocal = 0;
+
+	/*
+	 * If the device is in the middle of being closed, then block
+	 * until it's done, and then try again.
+	 */
+	if (info->flags & ZILOG_CLOSING) {
+		interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+		if (info->flags & ZILOG_HUP_NOTIFY)
+			return -EAGAIN;
+		else
+			return -ERESTARTSYS;
+#else
+		return -EAGAIN;
+#endif
+	}
+
+	/*
+	 * If this is a callout device, then just make sure the normal
+	 * device isn't being used.
+	 */
+	if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
+		if (info->flags & ZILOG_NORMAL_ACTIVE)
+			return -EBUSY;
+		if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
+		    (info->flags & ZILOG_SESSION_LOCKOUT) &&
+		    (info->session != current->session))
+		    return -EBUSY;
+		if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
+		    (info->flags & ZILOG_PGRP_LOCKOUT) &&
+		    (info->pgrp != current->pgrp))
+		    return -EBUSY;
+		info->flags |= ZILOG_CALLOUT_ACTIVE;
+		return 0;
+	}
+	
+	/*
+	 * If non-blocking mode is set, or the port is not enabled,
+	 * then make the check up front and then exit.
+	 */
+	if ((filp->f_flags & O_NONBLOCK) ||
+	    (tty->flags & (1 << TTY_IO_ERROR))) {
+		if (info->flags & ZILOG_CALLOUT_ACTIVE)
+			return -EBUSY;
+		info->flags |= ZILOG_NORMAL_ACTIVE;
+		return 0;
+	}
+
+	if (info->flags & ZILOG_CALLOUT_ACTIVE) {
+		if (info->normal_termios.c_cflag & CLOCAL)
+			do_clocal = 1;
+	} else {
+		if (tty->termios->c_cflag & CLOCAL)
+			do_clocal = 1;
+	}
+	
+	/*
+	 * Block waiting for the carrier detect and the line to become
+	 * free (i.e., not in use by the callout).  While we are in
+	 * this loop, info->count is dropped by one, so that
+	 * rs_close() knows when to free things.  We restore it upon
+	 * exit, either normal or abnormal.
+	 */
+	retval = 0;
+	add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+	printk("block_til_ready before block: ttys%d, count = %d\n",
+	       info->line, info->count);
+#endif
+	cli();
+	if (!tty_hung_up_p(filp)) 
+		info->count--;
+	sti();
+	info->blocked_open++;
+	while (1) {
+		cli();
+		if (!(info->flags & ZILOG_CALLOUT_ACTIVE) &&
+		    (tty->termios->c_cflag & CBAUD))
+			zs_rtsdtr(info, 1);
+		sti();
+		current->state = TASK_INTERRUPTIBLE;
+		if (tty_hung_up_p(filp) ||
+		    !(info->flags & ZILOG_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+			if (info->flags & ZILOG_HUP_NOTIFY)
+				retval = -EAGAIN;
+			else
+				retval = -ERESTARTSYS;	
+#else
+			retval = -EAGAIN;
+#endif
+			break;
+		}
+		if (!(info->flags & ZILOG_CALLOUT_ACTIVE) &&
+		    !(info->flags & ZILOG_CLOSING) &&
+		    (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD)))
+			break;
+		if (current->signal & ~current->blocked) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+#ifdef SERIAL_DEBUG_OPEN
+		printk("block_til_ready blocking: ttys%d, count = %d\n",
+		       info->line, info->count);
+#endif
+		schedule();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&info->open_wait, &wait);
+	if (!tty_hung_up_p(filp))
+		info->count++;
+	info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+	printk("block_til_ready after blocking: ttys%d, count = %d\n",
+	       info->line, info->count);
+#endif
+	if (retval)
+		return retval;
+	info->flags |= ZILOG_NORMAL_ACTIVE;
+	return 0;
+}	
+
+/*
+ * This routine is called whenever a serial port is opened.  It
+ * enables interrupts for a serial port, linking in its ZILOG structure into
+ * the IRQ chain.   It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+int rs_open(struct tty_struct *tty, struct file * filp)
+{
+	struct mac_serial	*info;
+	int 			retval, line;
+
+	line = MINOR(tty->device) - tty->driver.minor_start;
+	if ((line < 0) || (line >= zs_channels_found))
+		return -ENODEV;
+	info = zs_soft + line;
+
+	/* Is the kgdb running over this line? */
+	if (info->kgdb_channel)
+		return -ENODEV;
+	if (serial_paranoia_check(info, tty->device, "rs_open"))
+		return -ENODEV;
+#ifdef SERIAL_DEBUG_OPEN
+	printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
+	       info->count);
+#endif
+
+	info->count++;
+	tty->driver_data = info;
+	info->tty = tty;
+
+	/*
+	 * Start up serial port
+	 */
+	retval = startup(info);
+	if (retval)
+		return retval;
+
+	retval = block_til_ready(tty, filp, info);
+	if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+		printk("rs_open returning after block_til_ready with %d\n",
+		       retval);
+#endif
+		return retval;
+	}
+
+	if ((info->count == 1) && (info->flags & ZILOG_SPLIT_TERMIOS)) {
+		if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+			*tty->termios = info->normal_termios;
+		else 
+			*tty->termios = info->callout_termios;
+		change_speed(info);
+	}
+
+	info->session = current->session;
+	info->pgrp = current->pgrp;
+
+#ifdef SERIAL_DEBUG_OPEN
+	printk("rs_open ttys%d successful...", info->line);
+#endif
+	return 0;
+}
+
+/* Finally, routines used to initialize the serial driver. */
+
+static void show_serial_version(void)
+{
+	printk("PowerMac Z8530 serial driver version 1.00\n");
+}
+
+/* Ask the PROM how many Z8530s we have and initialize their zs_channels */
+static void
+probe_sccs()
+{
+	struct device_node *dev, *ch;
+	struct mac_serial **pp;
+	int n;
+
+	n = 0;
+	pp = &zs_chain;
+	for (dev = find_devices("escc"); dev != 0; dev = dev->next) {
+		if (n >= NUM_CHANNELS) {
+			printk("Sorry, can't use %s: no more channels\n",
+			       dev->full_name);
+			continue;
+		}
+		for (ch = dev->child; ch != 0; ch = ch->sibling) {
+			if (ch->n_addrs < 1 || ch ->n_intrs < 1) {
+				printk("Can't use %s: %d addrs %d intrs\n",
+				      ch->full_name, ch->n_addrs, ch->n_intrs);
+				continue;
+			}
+			zs_channels[n].control = (volatile unsigned char *)
+				ch->addrs[0].address;
+			zs_channels[n].data = zs_channels[n].control
+				+ ch->addrs[0].size / 2;
+			zs_soft[n].zs_channel = &zs_channels[n];
+			zs_soft[n].irq = ch->intrs[0];
+			if (request_irq(ch->intrs[0], rs_interrupt, 0,
+					"SCC", &zs_soft[n]))
+				panic("macserial: can't get irq %d",
+				      ch->intrs[0]);
+			/* XXX this assumes the prom puts chan A before B */
+			if (n & 1)
+				zs_soft[n].zs_chan_a = &zs_channels[n-1];
+			else
+				zs_soft[n].zs_chan_a = &zs_channels[n];
+
+			*pp = &zs_soft[n];
+			pp = &zs_soft[n].zs_next;
+			++n;
+		}
+	}
+	*pp = 0;
+	zs_channels_found = n;
+}
+
+/* rs_init inits the driver */
+int rs_init(void)
+{
+	int channel, i;
+	unsigned long flags;
+	struct mac_serial *info;
+
+	/* Setup base handler, and timer table. */
+	init_bh(SERIAL_BH, do_serial_bh);
+	timer_table[RS_TIMER].fn = rs_timer;
+	timer_table[RS_TIMER].expires = 0;
+
+	/* Find out how many Z8530 SCCs we have */
+	if (zs_chain == 0)
+		probe_sccs();
+
+	show_serial_version();
+
+	/* Initialize the tty_driver structure */
+	/* Not all of this is exactly right for us. */
+
+	memset(&serial_driver, 0, sizeof(struct tty_driver));
+	serial_driver.magic = TTY_DRIVER_MAGIC;
+	serial_driver.name = "ttyS";
+	serial_driver.major = TTY_MAJOR;
+	serial_driver.minor_start = 64;
+	serial_driver.num = zs_channels_found;
+	serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
+	serial_driver.subtype = SERIAL_TYPE_NORMAL;
+	serial_driver.init_termios = tty_std_termios;
+
+	serial_driver.init_termios.c_cflag =
+		B38400 | CS8 | CREAD | HUPCL | CLOCAL;
+	serial_driver.flags = TTY_DRIVER_REAL_RAW;
+	serial_driver.refcount = &serial_refcount;
+	serial_driver.table = serial_table;
+	serial_driver.termios = serial_termios;
+	serial_driver.termios_locked = serial_termios_locked;
+
+	serial_driver.open = rs_open;
+	serial_driver.close = rs_close;
+	serial_driver.write = rs_write;
+	serial_driver.flush_chars = rs_flush_chars;
+	serial_driver.write_room = rs_write_room;
+	serial_driver.chars_in_buffer = rs_chars_in_buffer;
+	serial_driver.flush_buffer = rs_flush_buffer;
+	serial_driver.ioctl = rs_ioctl;
+	serial_driver.throttle = rs_throttle;
+	serial_driver.unthrottle = rs_unthrottle;
+	serial_driver.set_termios = rs_set_termios;
+	serial_driver.stop = rs_stop;
+	serial_driver.start = rs_start;
+	serial_driver.hangup = rs_hangup;
+
+	/*
+	 * The callout device is just like normal device except for
+	 * major number and the subtype code.
+	 */
+	callout_driver = serial_driver;
+	callout_driver.name = "cua";
+	callout_driver.major = TTYAUX_MAJOR;
+	callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+
+	if (tty_register_driver(&serial_driver))
+		panic("Couldn't register serial driver\n");
+	if (tty_register_driver(&callout_driver))
+		panic("Couldn't register callout driver\n");
+
+	save_flags(flags); cli();
+
+	for (channel = 0; channel < zs_channels_found; ++channel) {
+		zs_soft[channel].clk_divisor = 16;
+		zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
+
+		/* If console serial line, then enable interrupts. */
+		if (zs_soft[channel].is_cons) {
+			write_zsreg(zs_soft[channel].zs_channel, R1,
+				    (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB));
+			write_zsreg(zs_soft[channel].zs_channel, R9,
+				    (NV | MIE));
+		}
+		/* If this is the kgdb line, enable interrupts because we
+		 * now want to receive the 'control-c' character from the
+		 * client attached to us asynchronously.
+		 */
+		if (zs_soft[channel].kgdb_channel)
+			kgdb_chaninit(&zs_soft[channel], 1,
+				      zs_soft[channel].zs_baud);
+	}
+
+	for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
+	{
+		info->magic = SERIAL_MAGIC;
+		info->port = (int) info->zs_channel->control;
+		info->line = i;
+		info->tty = 0;
+		info->custom_divisor = 16;
+		info->close_delay = 50;
+		info->closing_wait = 3000;
+		info->x_char = 0;
+		info->event = 0;
+		info->count = 0;
+		info->blocked_open = 0;
+		info->tqueue.routine = do_softint;
+		info->tqueue.data = info;
+		info->tqueue_hangup.routine = do_serial_hangup;
+		info->tqueue_hangup.data = info;
+		info->callout_termios =callout_driver.init_termios;
+		info->normal_termios = serial_driver.init_termios;
+		info->open_wait = 0;
+		info->close_wait = 0;
+		printk("tty%02d at 0x%08x (irq = %d)", info->line, 
+		       info->port, info->irq);
+		printk(" is a Z8530 ESCC\n");
+	}
+
+	restore_flags(flags);
+
+	return 0;
+}
+
+/*
+ * register_serial and unregister_serial allows for serial ports to be
+ * configured at run-time, to support PCMCIA modems.
+ */
+/* PowerMac: Unused at this time, just here to make things link. */
+int register_serial(struct serial_struct *req)
+{
+	return -1;
+}
+
+void unregister_serial(int line)
+{
+	return;
+}
+
+extern void register_console(void (*proc)(const char *));
+
+/*
+ * Initialization values for when a channel is used for
+ * a serial console.
+ */
+static unsigned char cons_init_regs[16] = {
+	0, 0, 0,		/* write 0, 1, 2 */
+	(Rx8 | RxENABLE),	/* write 3 */
+	(X16CLK | SB1),		/* write 4 */
+	(Tx8 | TxENAB | RTS),	/* write 5 */
+	0, 0, 0,		/* write 6, 7, 8 */
+	0,			/* write 9 */
+	(NRZ),			/* write 10 */
+	(TCBR | RCBR),		/* write 11 */
+	1, 0,			/* 38400 baud divisor, write 12 + 13 */
+	(BRENABL),		/* write 14 */
+	0			/* write 15 */
+};
+
+/*
+ * Hooks for running a serial console.  con_init() calls this if the
+ * console is being run over one of the serial ports.
+ * 'channel' is decoded as 1=modem, 2=printer.
+ */
+void
+rs_cons_hook(int chip, int out, int channel)
+{
+	int brg;
+
+	if (!out)
+		return;
+	if (zs_consinfo != 0) {
+		printk("rs_cons_hook called twice?\n");
+		return;
+	}
+	if (zs_chain == 0)
+		probe_sccs();
+	--channel;
+	if (channel < 0 || channel >= zs_channels_found) {
+		printk("rs_cons_hook: channel = %d?\n", channel);
+		return;
+	}
+
+	zs_cons_chan = channel;
+	zs_consinfo = &zs_soft[channel];
+	zs_conschan = zs_consinfo->zs_channel;
+	zs_consinfo->clk_divisor = 16;
+	zs_consinfo->zs_baud = 38400;
+	zs_consinfo->is_cons = 1;
+
+	memcpy(zs_consinfo->curregs, cons_init_regs, sizeof(cons_init_regs));
+	brg = BPS_TO_BRG(zs_consinfo->zs_baud, ZS_CLOCK/16);
+	zs_consinfo->curregs[R12] = brg;
+	zs_consinfo->curregs[R13] = brg >> 8;
+	load_zsregs(zs_conschan, zs_consinfo->curregs);
+
+	register_console(zs_console_print);
+	printk("zs%d: console I/O\n", channel);
+}
+
+/* This is called at boot time to prime the kgdb serial debugging
+ * serial line.  The 'tty_num' argument is 0 for /dev/ttyS0 and 1
+ * for /dev/ttyS1 which is determined in setup_arch() from the
+ * boot command line flags.
+ */
+void
+rs_kgdb_hook(int tty_num)
+{
+	if (zs_chain == 0)
+		probe_sccs();
+	zs_kgdbchan = zs_soft[tty_num].zs_channel;
+	zs_soft[tty_num].clk_divisor = 16;
+	zs_soft[tty_num].zs_baud = get_zsbaud(&zs_soft[tty_num]);
+	zs_soft[tty_num].kgdb_channel = 1;     /* This runs kgdb */
+	zs_soft[tty_num ^ 1].kgdb_channel = 0; /* This does not */
+	/* Turn on transmitter/receiver at 8-bits/char */
+	kgdb_chaninit(&zs_soft[tty_num], 0, 9600);
+	ZS_CLEARERR(zs_kgdbchan);
+	ZS_CLEARFIFO(zs_kgdbchan);
+}

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov