Serial console support for macppc. Serial console will work if the modem

has been replaced with a serial port adapter on any machine that has
a real serial port internally. This will also power on the internal modem
for keylargo based machines (tested on original PBG4) when the serial port
is open. ok miod@

5 files changed, 2973 insertions, 45 deletions

diff --git a/sys/arch/macppc/dev/z8530reg.h b/sys/arch/macppc/dev/z8530reg.h
new file mode 100644
index 00000000000..9b4bd925caf
--- /dev/null
+++ b/sys/arch/macppc/dev/z8530reg.h
@@ -0,0 +1,451 @@
+/*	$OpenBSD: z8530reg.h,v 1.1 2002/09/06 13:56:51 drahn Exp $	*/
+/*	$NetBSD: z8530reg.h,v 1.9 1998/07/31 05:08:38 wrstuden Exp $ */
+
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Lawrence Berkeley Laboratory.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)zsreg.h	8.1 (Berkeley) 6/11/93
+ */
+
+/*
+ * Zilog SCC registers, as implemented on the Sun-4c.
+ *
+ * Each Z8530 implements two channels (called `a' and `b').
+ *
+ * The damnable chip was designed to fit on Z80 I/O ports, and thus
+ * has everything multiplexed out the wazoo.  We have to select
+ * a register, then read or write the register, and so on.  Worse,
+ * the parameter bits are scattered all over the register space.
+ * This thing is full of `miscellaneous' control registers.
+ *
+ * Worse yet, the registers have incompatible functions on read
+ * and write operations.  We describe the registers below according
+ * to whether they are `read registers' (RR) or `write registers' (WR).
+ * As if this were not enough, some of the channel B status bits show
+ * up in channel A, and vice versa.  The blasted thing shares write
+ * registers 2 and 9 across both channels, and reads registers 2 and 3
+ * differently for the two channels.  We can, however, ignore this much
+ * of the time.
+ *
+ * This file also includes flags for the Z85C30 and Z85230 enhanced scc.
+ * The CMOS 8530 includes extra SDLC functionality, and is used in a
+ * number of Macs (often in the Z85C80, an 85C30 combined w/ a SCSI
+ * controller). -wrs
+ *
+ * Some of the names in this files were chosen to make the hsis driver
+ * work unchanged (which means that they will match some in SunOS).
+ *
+ * `S.C.' stands for Special Condition, which is any of these:
+ *	receiver overrun	(aka silo overflow)
+ *	framing error		(missing stop bit, etc)
+ *	end of frame		(in synchronous modes)
+ *	parity error		(when `parity error is S.C.' is set)
+ *
+ * Registers with only a single `numeric value' get a name.
+ * Other registers hold bits and are only numbered; the bit
+ * definitions imply the register number (see below).
+ *
+ * We never use the receive and transmit data registers as
+ * indirects (choosing instead the zc_data register), so they
+ * are not defined here.
+ */
+#define	ZSRR_IVEC	2	/* interrupt vector (channel 0) */
+#define	ZSRR_IPEND	3	/* interrupt pending (ch. 0 only) */
+#define	ZSRR_TXSYNC	6	/* sync transmit char (monosync mode) */
+#define	ZSRR_RXSYNC	7	/* sync receive char (monosync mode) */
+#define	ZSRR_SYNCLO	6	/* sync low byte (bisync mode) */
+#define	ZSRR_SYNCHI	7	/* sync high byte (bisync mode) */
+#define	ZSRR_SDLC_ADDR	6	/* SDLC address (SDLC mode) */
+#define	ZSRR_SDLC_FLAG	7	/* SDLC flag 0x7E (SDLC mode) */
+#define	ZSRR_BAUDLO	12	/* baud rate generator (low half) */
+#define	ZSRR_BAUDHI	13	/* baud rate generator (high half) */
+#define	ZSRR_ENHANCED	14	/* read address of WR7' - yes, it's not 7!*/
+
+#define	ZSWR_IVEC	2	/* interrupt vector (shared) */
+#define	ZSWR_TXSYNC	6	/* sync transmit char (monosync mode) */
+#define	ZSWR_RXSYNC	7	/* sync receive char (monosync mode) */
+#define	ZSWR_SYNCLO	6	/* sync low byte (bisync mode) */
+#define	ZSWR_SYNCHI	7	/* sync high byte (bisync mode) */
+#define	ZSWR_SDLC_ADDR	6	/* SDLC address (SDLC mode) */
+#define	ZSWR_SDLC_FLAG	7	/* SDLC flag 0x7E (SDLC mode) */
+#define	ZSWR_BAUDLO	12	/* baud rate generator (low half) */
+#define	ZSWR_BAUDHI	13	/* baud rate generator (high half) */
+#define	ZSWR_ENHANCED	7	/* write address of WR7' */
+
+/*
+ * Registers 0 through 7 may be written with any one of the 8 command
+ * modifiers, and/or any one of the 4 reset modifiers, defined below.
+ * To write registers 8 through 15, however, the command modifier must
+ * always be `point high'.  Rather than track this bizzareness all over
+ * the driver, we try to avoid using any modifiers, ever (but they are
+ * defined here if you want them).
+ */
+#define	ZSM_RESET_TXUEOM	0xc0	/* reset xmit underrun / eom latch */
+#define	ZSM_RESET_TXCRC		0x80	/* reset xmit crc generator */
+#define	ZSM_RESET_RXCRC		0x40	/* reset recv crc checker */
+#define	ZSM_NULL		0x00	/* nothing special */
+
+#define	ZSM_RESET_IUS		0x38	/* reset interrupt under service */
+#define	ZSM_RESET_ERR		0x30	/* reset error cond */
+#define	ZSM_RESET_TXINT		0x28	/* reset xmit interrupt pending */
+#define	ZSM_EI_NEXTRXC		0x20	/* enable int. on next rcvd char */
+#define	ZSM_SEND_ABORT		0x18	/* send abort (SDLC) */
+#define	ZSM_RESET_STINT		0x10	/* reset external/status interrupt */
+#define	ZSM_POINTHIGH		0x08	/* `point high' (use r8-r15) */
+#define	ZSM_NULL		0x00	/* nothing special */
+
+/*
+ * Commands for Write Register 0 (`Command Register').
+ * These are just the command modifiers or'ed with register number 0
+ * (which of course equals the command modifier).
+ */
+#define	ZSWR0_RESET_EOM		ZSM_RESET_TXUEOM
+#define	ZSWR0_RESET_TXCRC	ZSM_RESET_TXCRC
+#define	ZSWR0_RESET_RXCRC	ZSM_RESET_RXCRC
+#define	ZSWR0_CLR_INTR		ZSM_RESET_IUS
+#define	ZSWR0_RESET_ERRORS	ZSM_RESET_ERR
+#define	ZSWR0_EI_NEXTRXC	ZSM_EI_NEXTRXC
+#define	ZSWR0_SEND_ABORT	ZSM_SEND_ABORT
+#define	ZSWR0_RESET_STATUS	ZSM_RESET_STINT
+#define	ZSWR0_RESET_TXINT	ZSM_RESET_TXINT
+
+/*
+ * Bits in Write Register 1 (`Transmit/Receive Interrupt and Data
+ * Transfer Mode Definition').  Note that bits 3 and 4 are taken together
+ * as a single unit, and bits 5 and 6 are useful only if bit 7 is set.
+ */
+#define	ZSWR1_REQ_WAIT		0x80	/* WAIT*-REQ* pin gives WAIT* */
+#define	ZSWR1_REQ_REQ		0xc0	/* WAIT*-REQ* pin gives REQ* */
+#define	ZSWR1_REQ_TX		0x00	/* WAIT*-REQ* pin follows xmit buf */
+#define	ZSWR1_REQ_RX		0x20	/* WAIT*-REQ* pin follows recv buf */
+
+#define	ZSWR1_RIE_NONE		0x00	/* disable rxint entirely */
+#define	ZSWR1_RIE_FIRST		0x08	/* rxint on first char & on S.C. */
+#define	ZSWR1_RIE		0x10	/* rxint per char & on S.C. */
+#define	ZSWR1_RIE_SPECIAL_ONLY	0x18	/* rxint on S.C. only */
+
+#define	ZSWR1_PE_SC		0x04	/* parity error is special condition */
+#define	ZSWR1_TIE		0x02	/* transmit interrupt enable */
+#define	ZSWR1_SIE		0x01	/* external/status interrupt enable */
+
+#define	ZSWR1_IMASK 	0x1F	/* mask of all itr. enable bits. */
+
+/* HSIS compat */
+#define	ZSWR1_REQ_ENABLE	(ZSWR1_REQ_WAIT | ZSWR1_REQ_TX)
+
+/*
+ * Bits in Write Register 3 (`Receive Parameters and Control').
+ * Bits 7 and 6 are taken as a unit.  Note that the receive bits
+ * per character ordering is insane.
+ *
+ * Here `hardware flow control' means CTS enables the transmitter
+ * and DCD enables the receiver.  The latter is neither interesting
+ * nor useful, and gets in our way, making it almost unusable.
+ */
+#define	ZSWR3_RX_5		0x00	/* receive 5 bits per char */
+#define	ZSWR3_RX_7		0x40	/* receive 7 bits per char */
+#define	ZSWR3_RX_6		0x80	/* receive 6 bits per char */
+#define	ZSWR3_RX_8		0xc0	/* receive 8 bits per char */
+#define	ZSWR3_RXSIZE		0xc0	/* receive char size mask */
+
+#define	ZSWR3_HFC		0x20	/* hardware flow control */
+#define	ZSWR3_HUNT		0x10	/* enter hunt mode */
+#define	ZSWR3_RXCRC_ENABLE	0x08	/* enable recv crc calculation */
+#define	ZSWR3_ADDR_SEARCH_MODE	0x04	/* address search mode (SDLC only) */
+#define	ZSWR3_SDLC_SHORT_ADDR	0x02	/* short address mode (SDLC only) */
+#define	ZSWR3_SYNC_LOAD_INH	0x02	/* sync character load inhibit */
+#define	ZSWR3_RX_ENABLE		0x01	/* receiver enable */
+
+/*
+ * Bits in Write Register 4 (`Transmit/Receive Miscellaneous Parameters
+ * and Modes').  Bits 7&6, 5&4, and 3&2 are taken as units.
+ */
+#define	ZSWR4_CLK_X1		0x00	/* clock divisor = 1 */
+#define	ZSWR4_CLK_X16		0x40	/* clock divisor = 16 */
+#define	ZSWR4_CLK_X32		0x80	/* clock divisor = 32 */
+#define	ZSWR4_CLK_X64		0xc0	/* clock divisor = 64 */
+#define	ZSWR4_CLK_MASK		0xc0	/* clock divisor mask */
+
+#define	ZSWR4_MONOSYNC		0x00	/* 8 bit sync char (sync only) */
+#define	ZSWR4_BISYNC		0x10	/* 16 bit sync char (sync only) */
+#define	ZSWR4_SDLC  		0x20	/* SDLC mode */
+#define	ZSWR4_EXTSYNC		0x30	/* external sync mode */
+#define	ZSWR4_SYNC_MASK		0x30	/* sync mode bit mask */
+
+#define	ZSWR4_SYNCMODE		0x00	/* no stop bit (sync mode only) */
+#define	ZSWR4_ONESB 		0x04	/* 1 stop bit */
+#define	ZSWR4_1P5SB 		0x08	/* 1.5 stop bits (clk cannot be 1x) */
+#define	ZSWR4_TWOSB 		0x0c	/* 2 stop bits */
+#define	ZSWR4_SBMASK		0x0c	/* mask of all stop bits */
+
+#define	ZSWR4_EVENP 		0x02	/* check for even parity */
+#define	ZSWR4_PARENB		0x01	/* enable parity checking */
+#define	ZSWR4_PARMASK		0x03	/* mask of all parity bits */
+
+/*
+ * Bits in Write Register 5 (`Transmit Parameter and Controls').
+ * Bits 6 and 5 are taken as a unit; the ordering is, as with RX
+ * bits per char, not sensible.
+ */
+#define	ZSWR5_DTR		0x80	/* assert (set to -12V) DTR */
+
+#define	ZSWR5_TX_5		0x00	/* transmit 5 or fewer bits */
+#define	ZSWR5_TX_7		0x20	/* transmit 7 bits */
+#define	ZSWR5_TX_6		0x40	/* transmit 6 bits */
+#define	ZSWR5_TX_8		0x60	/* transmit 8 bits */
+#define	ZSWR5_TXSIZE		0x60	/* transmit char size mask */
+
+#define	ZSWR5_BREAK		0x10	/* send break (continuous 0s) */
+#define	ZSWR5_TX_ENABLE		0x08	/* enable transmitter */
+#define	ZSWR5_CRC16		0x04	/* use CRC16 (off => use SDLC) */
+#define	ZSWR5_RTS		0x02	/* assert RTS */
+#define	ZSWR5_TXCRC_ENABLE	0x01	/* enable xmit crc calculation */
+
+#ifdef not_done_here
+/*
+ * Bits in Write Register 7 when the chip is in SDLC mode.
+ */
+#define	ZSWR7_SDLCFLAG		0x7e	/* this value makes SDLC mode work */
+#endif
+
+/*
+ * Bits in Write Register 7' (ZSWR_ENHANCED above). This register is
+ * only available on the 85230. Dispite the fact it contains flags
+ * and not a single value, the register was named as it is read
+ * via RR14. Weird.
+ */
+			/*	0x80	unused */
+#define	ZSWR7P_EXTEND_READ	0x40	/* modify read map; make most regs readable */
+#define	ZSWR7P_TX_FIFO		0x20	/* change level for Tx FIFO empty int */
+#define	ZSWR7P_DTR_TIME		0x10	/* modifies deact. speed of /DTR//REQ */
+#define	ZSWR7P_RX_FIFO		0x08	/* Rx FIFO int on 1/2 full? */
+#define	ZSWR7P_RTS_DEACT	0x04	/* automatically deassert RTS */
+#define	ZSWR7P_AUTO_EOM_RESET	0x02	/* automatically reset EMO/Tx Underrun */
+#define	ZSWR7P_AUTO_TX_FLAG	0x01	/* Auto send SDLC flag at transmit start */
+
+/*
+ * Bits in Write Register 9 (`Master Interrupt Control').  Bits 7 & 6
+ * are taken as a unit and indicate the type of reset; 00 means no reset
+ * (and is not defined here).
+ */
+#define	ZSWR9_HARD_RESET	0xc0	/* force hardware reset */
+#define	ZSWR9_A_RESET		0x80	/* reset channel A (0) */
+#define	ZSWR9_B_RESET		0x40	/* reset channel B (1) */
+#define	ZSWR9_SOFT_INTAC	0x20	/* Not in NMOS version */
+
+#define	ZSWR9_STATUS_HIGH	0x10	/* status in high bits of intr vec */
+#define	ZSWR9_MASTER_IE		0x08	/* master interrupt enable */
+#define	ZSWR9_DLC		0x04	/* disable lower chain */
+#define	ZSWR9_NO_VECTOR		0x02	/* no vector */
+#define	ZSWR9_VECTOR_INCL_STAT	0x01	/* vector includes status */
+
+/*
+ * Bits in Write Register 10 (`Miscellaneous Transmitter/Receiver Control
+ * Bits').  Bits 6 & 5 are taken as a unit, and some of the bits are
+ * meaningful only in certain modes.  Bleah.
+ */
+#define	ZSWR10_PRESET_ONES	0x80	/* preset CRC to all 1 (else all 0) */
+
+#define	ZSWR10_NRZ		0x00	/* NRZ encoding */
+#define	ZSWR10_NRZI		0x20	/* NRZI encoding */
+#define	ZSWR10_FM1		0x40	/* FM1 encoding */
+#define	ZSWR10_FM0		0x60	/* FM0 encoding */
+
+#define	ZSWR10_GA_ON_POLL	0x10	/* go active on poll (loop mode) */
+#define	ZSWR10_MARK_IDLE	0x08	/* all 1s (vs flag) when idle (SDLC) */
+#define	ZSWR10_ABORT_ON_UNDERRUN 0x4	/* abort on xmit underrun (SDLC) */
+#define	ZSWR10_LOOP_MODE	0x02	/* loop mode (SDLC) */
+#define	ZSWR10_6_BIT_SYNC	0x01	/* 6 bits per sync char (sync modes) */
+
+/*
+ * Bits in Write Register 11 (`Clock Mode Control').  Bits 6&5, 4&3, and
+ * 1&0 are taken as units.  Various bits depend on other bits in complex
+ * ways; see the Zilog manual.
+ */
+#define	ZSWR11_XTAL		0x80	/* have xtal between RTxC* and SYNC* */
+					/* (else have TTL oscil. on RTxC*) */
+#define	ZSWR11_RXCLK_RTXC	0x00	/* recv clock taken from RTxC* pin */
+#define	ZSWR11_RXCLK_TRXC	0x20	/* recv clock taken from TRxC* pin */
+#define	ZSWR11_RXCLK_BAUD	0x40	/* recv clock taken from BRG */
+#define	ZSWR11_RXCLK_DPLL	0x60	/* recv clock taken from DPLL */
+
+#define	ZSWR11_TXCLK_RTXC	0x00	/* xmit clock taken from RTxC* pin */
+#define	ZSWR11_TXCLK_TRXC	0x08	/* xmit clock taken from TRxC* pin */
+#define	ZSWR11_TXCLK_BAUD	0x10	/* xmit clock taken from BRG */
+#define	ZSWR11_TXCLK_DPLL	0x18	/* xmit clock taken from DPLL */
+
+#define	ZSWR11_TRXC_OUT_ENA	0x04	/* TRxC* pin will be an output */
+					/* (unless it is being used above) */
+#define	ZSWR11_TRXC_XTAL	0x00	/* TRxC output from xtal oscillator */
+#define	ZSWR11_TRXC_XMIT	0x01	/* TRxC output from xmit clock */
+#define	ZSWR11_TRXC_BAUD	0x02	/* TRxC output from BRG */
+#define	ZSWR11_TRXC_DPLL	0x03	/* TRxC output from DPLL */
+
+/*
+ * Formula for Write Registers 12 and 13 (`Lower Byte of Baud Rate
+ * Generator Time Constant' and `Upper Byte of ...').  Inputs:
+ *
+ *	f	BRG input clock frequency (in Hz) AFTER division
+ *		by 1, 16, 32, or 64 (per clock divisor in WR4)
+ *	bps	desired rate in bits per second (9600, etc)
+ *
+ * We want
+ *
+ *	  f
+ *	----- + 0.5 - 2
+ *	2 bps
+ *
+ * rounded down to an integer.  This can be computed entirely
+ * in integer arithemtic as:
+ *
+ *	f + bps
+ *	------- - 2
+ *	 2 bps
+ */
+#define	BPS_TO_TCONST(f, bps)	((((f) + (bps)) / (2 * (bps))) - 2)
+
+/* inverse of above: given a BRG Time Constant, return Bits Per Second */
+#define	TCONST_TO_BPS(f, tc)	((f) / 2 / ((tc) + 2))
+
+/*
+ * Bits in Write Register 14 (`Miscellaneous Control Bits').
+ * Bits 7 through 5 are taken as a unit and make up a `DPLL command'.
+ */
+#define	ZSWR14_DPLL_NOOP	0x00	/* leave DPLL alone */
+#define	ZSWR14_DPLL_SEARCH	0x20	/* enter search mode */
+#define	ZSWR14_DPLL_RESET_CM	0x40	/* reset `clock missing' in RR10 */
+#define	ZSWR14_DPLL_DISABLE	0x60	/* disable DPLL (continuous search) */
+#define	ZSWR14_DPLL_SRC_BAUD	0x80	/* set DPLL src = BRG */
+#define	ZSWR14_DPLL_SRC_RTXC	0xa0	/* set DPLL src = RTxC* or xtal osc */
+#define	ZSWR14_DPLL_FM		0xc0	/* operate in FM mode */
+#define	ZSWR14_DPLL_NRZI	0xe0	/* operate in NRZI mode */
+
+#define	ZSWR14_LOCAL_LOOPBACK	0x10	/* set local loopback mode */
+#define	ZSWR14_AUTO_ECHO	0x08	/* set auto echo mode */
+#define	ZSWR14_DTR_REQ		0x04	/* DTR* / REQ* pin gives REQ* */
+#define	ZSWR14_BAUD_FROM_PCLK	0x02	/* BRG clock taken from PCLK */
+					/* (else from RTxC* pin or xtal osc) */
+#define	ZSWR14_BAUD_ENA		0x01	/* enable BRG countdown */
+
+/*
+ * Bits in Write Register 15 (`External/Status Interrupt Control').
+ * Most of these cause status interrupts whenever the corresponding
+ * bit or pin changes state (i.e., any rising or falling edge).
+ *
+ * NOTE: ZSWR15_SDLC_FIFO & ZSWR15_ENABLE_ENHANCED should not be
+ * set on an NMOS 8530. Also, ZSWR15_ENABLE_ENHANCED is only
+ * available on the 85230.
+ */
+#define	ZSWR15_BREAK_IE		0x80	/* enable break/abort status int */
+#define	ZSWR15_TXUEOM_IE	0x40	/* enable TX underrun/EOM status int */
+#define	ZSWR15_CTS_IE		0x20	/* enable CTS* pin status int */
+#define	ZSWR15_SYNCHUNT_IE	0x10	/* enable SYNC* pin/hunt status int */
+#define	ZSWR15_DCD_IE		0x08	/* enable DCD* pin status int */
+#define	ZSWR15_SDLC_FIFO	0x04	/* enable SDLC FIFO enhancements */
+#define	ZSWR15_ZERO_COUNT_IE	0x02	/* enable BRG-counter = 0 status int */
+#define	ZSWR15_ENABLE_ENHANCED	0x01	/* enable writing WR7' at reg 7 */
+
+/*
+ * Bits in Read Register 0 (`Transmit/Receive Buffer Status and External
+ * Status').
+ */
+#define	ZSRR0_BREAK		0x80	/* break/abort detected */
+#define	ZSRR0_TXUNDER		0x40	/* transmit underrun/EOM (sync) */
+#define	ZSRR0_CTS		0x20	/* clear to send */
+#define	ZSRR0_SYNC_HUNT		0x10	/* sync/hunt (sync mode) */
+#define	ZSRR0_DCD		0x08	/* data carrier detect */
+#define	ZSRR0_TX_READY		0x04	/* transmit buffer empty */
+#define	ZSRR0_ZERO_COUNT	0x02	/* zero count in baud clock */
+#define	ZSRR0_RX_READY		0x01	/* received character ready */
+
+/*
+ * Bits in Read Register 1 (the Zilog book does not name this one).
+ */
+#define	ZSRR1_EOF		0x80	/* end of frame (SDLC mode) */
+#define	ZSRR1_FE		0x40	/* CRC/framing error */
+#define	ZSRR1_DO		0x20	/* data (receiver) overrun */
+#define	ZSRR1_PE		0x10	/* parity error */
+#define	ZSRR1_RC0		0x08	/* residue code 0 (SDLC mode) */
+#define	ZSRR1_RC1		0x04	/* residue code 1 (SDLC mode) */
+#define	ZSRR1_RC2		0x02	/* residue code 2 (SDLC mode) */
+#define	ZSRR1_ALL_SENT		0x01	/* all chars out of xmitter (async) */
+
+/*
+ * Read Register 2 in B channel contains status bits if VECTOR_INCL_STAT
+ * is set.
+ */
+
+/*
+ * Bits in Read Register 3 (`Interrupt Pending').  Only channel A
+ * has an RR3.
+ */
+			/*	0x80	   unused, returned as 0 */
+			/*	0x40	   unused, returned as 0 */
+#define	ZSRR3_IP_A_RX		0x20	/* channel A recv int pending */
+#define	ZSRR3_IP_A_TX		0x10	/* channel A xmit int pending */
+#define	ZSRR3_IP_A_STAT		0x08	/* channel A status int pending */
+#define	ZSRR3_IP_B_RX		0x04	/* channel B recv int pending */
+#define	ZSRR3_IP_B_TX		0x02	/* channel B xmit int pending */
+#define	ZSRR3_IP_B_STAT		0x01	/* channel B status int pending */
+
+/*
+ * Bits in Read Register 10 (`contains some miscellaneous status bits').
+ */
+#define	ZSRR10_1_CLOCK_MISSING	0x80	/* 1 clock edge missing (FM mode) */
+#define	ZSRR10_2_CLOCKS_MISSING	0x40	/* 2 clock edges missing (FM mode) */
+			/*	0x20	   unused */
+#define	ZSRR10_LOOP_SENDING	0x10	/* xmitter controls loop (SDLC loop) */
+			/*	0x08	   unused */
+			/*	0x04	   unused */
+#define	ZSRR10_ON_LOOP		0x02	/* SCC is on loop (SDLC/X.21 modes) */
+
+/*
+ * Bits in Read Register 15.  This register is one of the few that
+ * simply reads back the corresponding Write Register.
+ */
+#define	ZSRR15_BREAK_IE		0x80	/* break/abort status int enable */
+#define	ZSRR15_TXUEOM_IE	0x40	/* TX underrun/EOM status int enable */
+#define	ZSRR15_CTS_IE		0x20	/* CTS* pin status int enable */
+#define	ZSRR15_SYNCHUNT_IE	0x10	/* SYNC* pin/hunt status int enable */
+#define	ZSRR15_DCD_IE		0x08	/* DCD* pin status int enable */
+			/*	0x04	   unused, returned as zero */
+#define	ZSRR15_ZERO_COUNT_IE	0x02	/* BRG-counter = 0 status int enable */
+			/*	0x01	   unused, returned as zero */
diff --git a/sys/arch/macppc/dev/z8530sc.c b/sys/arch/macppc/dev/z8530sc.c
new file mode 100644
index 00000000000..96de093e249
--- /dev/null
+++ b/sys/arch/macppc/dev/z8530sc.c
@@ -0,0 +1,357 @@
+/*	$OpenBSD: z8530sc.c,v 1.1 2002/09/06 13:56:51 drahn Exp $ */
+/*	$NetBSD: z8530sc.c,v 1.4 1996/05/17 19:30:34 gwr Exp $	*/
+
+/*
+ * Copyright (c) 1994 Gordon W. Ross
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Lawrence Berkeley Laboratory.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)zs.c	8.1 (Berkeley) 7/19/93
+ */
+
+/*
+ * Zilog Z8530 Dual UART driver (common part)
+ *
+ * This file contains the machine-independent parts of the
+ * driver common to tty and keyboard/mouse sub-drivers.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/tty.h>
+#include <sys/time.h>
+#include <sys/kernel.h>
+#include <sys/syslog.h>
+
+#include <macppc/dev/z8530reg.h>
+#include <machine/z8530var.h>
+
+void
+zs_break(cs, set)
+	struct zs_chanstate *cs;
+	int set;
+{
+
+	if (set) {
+		cs->cs_preg[5] |= ZSWR5_BREAK;
+		cs->cs_creg[5] |= ZSWR5_BREAK;
+	} else {
+		cs->cs_preg[5] &= ~ZSWR5_BREAK;
+		cs->cs_creg[5] &= ~ZSWR5_BREAK;
+	}
+	zs_write_reg(cs, 5, cs->cs_creg[5]);
+}
+
+
+/*
+ * drain on-chip fifo
+ */
+void
+zs_iflush(cs)
+	struct zs_chanstate *cs;
+{
+	u_char c, rr0, rr1;
+	int i;
+
+	/*
+	 * Count how many times we loop. Some systems, such as some
+	 * Apple PowerBooks, claim to have SCC's which they really don't.
+	 */
+	for (i = 0; i < 32; i++) {
+		/* Is there input available? */
+		rr0 = zs_read_csr(cs);
+		if ((rr0 & ZSRR0_RX_READY) == 0)
+			break;
+
+		/*
+		 * First read the status, because reading the data
+		 * destroys the status of this char.
+		 */
+		rr1 = zs_read_reg(cs, 1);
+		c = zs_read_data(cs);
+
+		if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
+			/* Clear the receive error. */
+			zs_write_csr(cs, ZSWR0_RESET_ERRORS);
+		}
+	}
+}
+	
+
+/*
+ * Write the given register set to the given zs channel in the proper order.
+ * The channel must not be transmitting at the time.  The receiver will
+ * be disabled for the time it takes to write all the registers.
+ * Call this with interrupts disabled.
+ */
+void
+zs_loadchannelregs(cs)
+	struct zs_chanstate *cs;
+{
+	u_char *reg;
+
+	zs_write_csr(cs, ZSM_RESET_ERR);	/* XXX: reset error condition */
+
+#if 1
+	/*
+	 * XXX: Is this really a good idea?
+	 * XXX: Should go elsewhere! -gwr
+	 */
+	zs_iflush(cs);	/* XXX */
+#endif
+
+	if (memcmp((caddr_t)cs->cs_preg, (caddr_t)cs->cs_creg, 16) == 0)
+		return;		/* only change if values are different */
+
+	/* Copy "pending" regs to "current" */
+	memcpy((caddr_t)cs->cs_creg, (caddr_t)cs->cs_preg, 16);
+	reg = cs->cs_creg;	/* current regs */
+
+	/* disable interrupts */
+	zs_write_reg(cs, 1, reg[1] & ~ZSWR1_IMASK);
+
+	/* baud clock divisor, stop bits, parity */
+	zs_write_reg(cs, 4, reg[4]);
+
+	/* misc. TX/RX control bits */
+	zs_write_reg(cs, 10, reg[10]);
+
+	/* char size, enable (RX/TX) */
+	zs_write_reg(cs, 3, reg[3] & ~ZSWR3_RX_ENABLE);
+	zs_write_reg(cs, 5, reg[5] & ~ZSWR5_TX_ENABLE);
+
+	/* synchronous mode stuff */
+	zs_write_reg(cs, 6, reg[6]);
+	zs_write_reg(cs, 7, reg[7]);
+
+#if 0
+	/*
+	 * Registers 2 and 9 are special because they are
+	 * actually common to both channels, but must be
+	 * programmed through channel A.  The "zsc" attach
+	 * function takes care of setting these registers
+	 * and they should not be touched thereafter.
+	 */
+	/* interrupt vector */
+	zs_write_reg(cs, 2, reg[2]);
+	/* master interrupt control */
+	zs_write_reg(cs, 9, reg[9]);
+#endif
+
+	/* Shut down the BRG */
+	zs_write_reg(cs, 14, reg[14] & ~ZSWR14_BAUD_ENA);
+
+#ifdef	ZS_MD_SETCLK
+	/* Let the MD code setup any external clock. */
+	ZS_MD_SETCLK(cs);
+#endif	/* ZS_MD_SETCLK */
+
+	/* clock mode control */
+	zs_write_reg(cs, 11, reg[11]);
+
+	/* baud rate (lo/hi) */
+	zs_write_reg(cs, 12, reg[12]);
+	zs_write_reg(cs, 13, reg[13]);
+
+	/* Misc. control bits */
+	zs_write_reg(cs, 14, reg[14]);
+
+	/* which lines cause status interrupts */
+	zs_write_reg(cs, 15, reg[15]);
+
+	/*
+	 * Zilog docs recommend resetting external status twice at this
+	 * point. Mainly as the status bits are latched, and the first
+	 * interrupt clear might unlatch them to new values, generating
+	 * a second interrupt request.
+	 */
+	zs_write_csr(cs, ZSM_RESET_STINT);
+	zs_write_csr(cs, ZSM_RESET_STINT);
+
+	/* char size, enable (RX/TX)*/
+	zs_write_reg(cs, 3, reg[3]);
+	zs_write_reg(cs, 5, reg[5]);
+
+	/* interrupt enables: TX, TX, STATUS */
+	zs_write_reg(cs, 1, reg[1]);
+}
+
+
+/*
+ * ZS hardware interrupt.  Scan all ZS channels.  NB: we know here that
+ * channels are kept in (A,B) pairs.
+ *
+ * Do just a little, then get out; set a software interrupt if more
+ * work is needed.
+ *
+ * We deliberately ignore the vectoring Zilog gives us, and match up
+ * only the number of `reset interrupt under service' operations, not
+ * the order.
+ */
+int
+zsc_intr_hard(arg)
+	void *arg;
+{
+	struct zsc_softc *zsc = arg;
+	struct zs_chanstate *cs;
+	u_char rr3;
+
+	/* First look at channel A. */
+	cs = zsc->zsc_cs[0];
+	/* Note: only channel A has an RR3 */
+	rr3 = zs_read_reg(cs, 3);
+
+	/*
+	 * Clear interrupt first to avoid a race condition.
+	 * If a new interrupt condition happens while we are
+	 * servicing this one, we will get another interrupt
+	 * shortly.  We can NOT just sit here in a loop, or
+	 * we will cause horrible latency for other devices
+	 * on this interrupt level (i.e. sun3x floppy disk).
+	 */
+	if (rr3 & (ZSRR3_IP_A_RX | ZSRR3_IP_A_TX | ZSRR3_IP_A_STAT)) {
+		zs_write_csr(cs, ZSWR0_CLR_INTR);
+		if (rr3 & ZSRR3_IP_A_RX)
+			(*cs->cs_ops->zsop_rxint)(cs);
+		if (rr3 & ZSRR3_IP_A_STAT)
+			(*cs->cs_ops->zsop_stint)(cs, 0);
+		if (rr3 & ZSRR3_IP_A_TX)
+			(*cs->cs_ops->zsop_txint)(cs);
+	}
+
+	/* Now look at channel B. */
+	cs = zsc->zsc_cs[1];
+	if (rr3 & (ZSRR3_IP_B_RX | ZSRR3_IP_B_TX | ZSRR3_IP_B_STAT)) {
+		zs_write_csr(cs, ZSWR0_CLR_INTR);
+		if (rr3 & ZSRR3_IP_B_RX)
+			(*cs->cs_ops->zsop_rxint)(cs);
+		if (rr3 & ZSRR3_IP_B_STAT)
+			(*cs->cs_ops->zsop_stint)(cs, 0);
+		if (rr3 & ZSRR3_IP_B_TX)
+			(*cs->cs_ops->zsop_txint)(cs);
+	}
+
+	/* Note: caller will check cs_x->cs_softreq and DTRT. */
+	return (rr3);
+}
+
+
+/*
+ * ZS software interrupt.  Scan all channels for deferred interrupts.
+ */
+int
+zsc_intr_soft(arg)
+	void *arg;
+{
+	struct zsc_softc *zsc = arg;
+	struct zs_chanstate *cs;
+	int rval, chan;
+
+	rval = 0;
+	for (chan = 0; chan < 2; chan++) {
+		cs = zsc->zsc_cs[chan];
+
+		/*
+		 * The softint flag can be safely cleared once
+		 * we have decided to call the softint routine.
+		 * (No need to do splzs() first.)
+		 */
+		if (cs->cs_softreq) {
+			cs->cs_softreq = 0;
+			(*cs->cs_ops->zsop_softint)(cs);
+			rval++;
+		}
+	}
+	return (rval);
+}
+
+/*
+ * Provide a null zs "ops" vector.
+ */
+
+void zsnull_rxint(struct zs_chanstate *);
+void zsnull_stint(struct zs_chanstate *, int);
+void zsnull_txint(struct zs_chanstate *);
+void zsnull_softint(struct zs_chanstate *);
+
+void
+zsnull_rxint(cs)
+	struct zs_chanstate *cs;
+{
+	/* Ask for softint() call. */
+	cs->cs_softreq = 1;
+}
+
+void
+zsnull_stint(cs, force)
+	struct zs_chanstate *cs;
+	int force;
+{
+	/* Ask for softint() call. */
+	cs->cs_softreq = 1;
+}
+
+void
+zsnull_txint(cs)
+	struct zs_chanstate *cs;
+{
+	/* Ask for softint() call. */
+	cs->cs_softreq = 1;
+}
+
+void
+zsnull_softint(cs)
+	struct zs_chanstate *cs;
+{
+	zs_write_reg(cs,  1, 0);
+	zs_write_reg(cs, 15, 0);
+}
+
+struct zsops zsops_null = {
+	zsnull_rxint,	/* receive char available */
+	zsnull_stint,	/* external/status */
+	zsnull_txint,	/* xmit buffer empty */
+	zsnull_softint,	/* process software interrupt */
+};
diff --git a/sys/arch/macppc/dev/z8530sc.h b/sys/arch/macppc/dev/z8530sc.h
new file mode 100644
index 00000000000..b3020c30eb0
--- /dev/null
+++ b/sys/arch/macppc/dev/z8530sc.h
@@ -0,0 +1,158 @@
+/*	$OpenBSD: z8530sc.h,v 1.1 2002/09/06 13:56:51 drahn Exp $	*/
+/*	$NetBSD: z8530sc.h,v 1.15 2001/05/11 01:40:48 thorpej Exp $	*/
+
+/*
+ * Copyright (c) 1994 Gordon W. Ross
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Lawrence Berkeley Laboratory.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)zsvar.h	8.1 (Berkeley) 6/11/93
+ */
+
+
+/*
+ * Function vector - per channel
+ */
+struct zs_chanstate;
+struct zsops {
+	void	(*zsop_rxint)(struct zs_chanstate *);
+					/* receive char available */
+	void	(*zsop_stint)(struct zs_chanstate *, int);
+					/* external/status */
+	void	(*zsop_txint)(struct zs_chanstate *);
+					/* xmit buffer empty */
+	void	(*zsop_softint)(struct zs_chanstate *);
+					/* process software interrupt */
+};
+
+extern struct zsops zsops_null;
+
+
+/*
+ * Software state, per zs channel.
+ */
+struct zs_chanstate {
+
+	/* Pointers to the device registers. */
+	volatile u_char	*cs_reg_csr; 	/* ctrl, status, and reg. number. */
+	volatile u_char	*cs_reg_data;	/* data or numbered register */
+
+	int	cs_channel;		/* sub-unit number */
+	void   *cs_private;		/* sub-driver data pointer */
+	struct zsops *cs_ops;
+
+	int	cs_brg_clk;		/* BAUD Rate Generator clock
+					 * (usually PCLK / 16) */
+	int	cs_defspeed;		/* default baud rate */
+	int	cs_defcflag;		/* default cflag */
+
+	/*
+	 * We must keep a copy of the write registers as they are
+	 * mostly write-only and we sometimes need to set and clear
+	 * individual bits (e.g., in WR3).  Not all of these are
+	 * needed but 16 bytes is cheap and this makes the addressing
+	 * simpler.  Unfortunately, we can only write to some registers
+	 * when the chip is not actually transmitting, so whenever
+	 * we are expecting a `transmit done' interrupt the preg array
+	 * is allowed to `get ahead' of the current values.  In a
+	 * few places we must change the current value of a register,
+	 * rather than (or in addition to) the pending value; for these
+	 * cs_creg[] contains the current value.
+	 */
+	u_char	cs_creg[16];		/* current values */
+	u_char	cs_preg[16];		/* pending values */
+	int 	cs_heldchange;		/* change pending (creg != preg) */
+
+	u_char	cs_rr0;			/* last rr0 processed */
+	u_char	cs_rr0_delta;		/* rr0 changes at status intr. */
+	u_char	cs_rr0_mask;		/* rr0 bits that stop output */
+	u_char	cs_rr0_dcd;		/* which bit to read as DCD */
+	u_char	cs_rr0_cts;		/* which bit to read as CTS */
+	u_char	cs_rr0_pps;		/* which bit to use for PPS */
+	/* the above is set only while CRTSCTS is enabled. */
+
+	u_char	cs_wr5_dtr;		/* which bit to write as DTR */
+	u_char	cs_wr5_rts;		/* which bit to write as RTS */
+	/* the above is set only while CRTSCTS is enabled. */
+
+	char	cs_softreq;		/* need soft interrupt call */
+	char	cs_spare1;  	/* (for skippy :) */
+
+	/* power management hooks */
+	int	(*enable)(struct zs_chanstate *);
+	void	(*disable)(struct zs_chanstate *);
+	int	enabled;
+
+	/* MD code might define a larger variant of this. */
+};
+
+struct consdev;
+struct zsc_attach_args {
+	char *type;		/* type name 'serial', 'keyboard', 'mouse' */
+	int channel;		/* two serial channels per zsc */
+	int hwflags;		/* see definitions below */
+	/* `consdev' is only valid if ZS_HWFLAG_USE_CONSDEV is set */
+	struct consdev *consdev;
+};
+/* In case of split console devices, use these: */
+#define ZS_HWFLAG_CONSOLE_INPUT		1
+#define ZS_HWFLAG_CONSOLE_OUTPUT	2
+#define ZS_HWFLAG_CONSOLE		\
+	(ZS_HWFLAG_CONSOLE_INPUT | ZS_HWFLAG_CONSOLE_OUTPUT)
+#define ZS_HWFLAG_NO_DCD	4	/* Ignore the DCD bit */
+#define ZS_HWFLAG_NO_CTS	8	/* Ignore the CTS bit */
+#define ZS_HWFLAG_RAW   	16	/* advise raw mode */
+#define ZS_HWFLAG_USE_CONSDEV  	32	/* Use console ops from `consdev' */
+#define	ZS_HWFLAG_NORESET	64	/* Don't reset at attach time */
+
+int 	zsc_intr_soft(void *);
+int 	zsc_intr_hard(void *);
+
+void	zs_abort(struct zs_chanstate *);
+void	zs_break(struct zs_chanstate *, int);
+void	zs_iflush(struct zs_chanstate *);
+void	zs_loadchannelregs(struct zs_chanstate *);
+int 	zs_set_speed(struct zs_chanstate *, int);
+int 	zs_set_modes(struct zs_chanstate *, int);
+
+extern int zs_major;
+
+int zs_check_kgdb(struct zs_chanstate *, int);
+
diff --git a/sys/arch/macppc/dev/z8530tty.c b/sys/arch/macppc/dev/z8530tty.c
new file mode 100644
index 00000000000..fa5ed80f464
--- /dev/null
+++ b/sys/arch/macppc/dev/z8530tty.c
@@ -0,0 +1,1642 @@
+/*	$OpenBSD: z8530tty.c,v 1.1 2002/09/06 13:56:51 drahn Exp $ */
+/*	$NetBSD: z8530tty.c,v 1.13 1996/10/16 20:42:14 gwr Exp $	*/
+
+/*-
+ * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998, 1999
+ *      Charles M. Hannum.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Charles M. Hannum.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 1994 Gordon W. Ross
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Lawrence Berkeley Laboratory.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)zs.c	8.1 (Berkeley) 7/19/93
+ */
+
+/*
+ * Zilog Z8530 Dual UART driver (tty interface)
+ *
+ * This is the "slave" driver that will be attached to
+ * the "zsc" driver for plain "tty" async. serial lines.
+ *
+ * Credits, history:
+ *
+ * The original version of this code was the sparc/dev/zs.c driver
+ * as distributed with the Berkeley 4.4 Lite release.  Since then,
+ * Gordon Ross reorganized the code into the current parent/child
+ * driver scheme, separating the Sun keyboard and mouse support
+ * into independent child drivers.
+ *
+ * RTS/CTS flow-control support was a collaboration of:
+ *	Gordon Ross <gwr@netbsd.org>,
+ *	Bill Studenmund <wrstuden@loki.stanford.edu>
+ *	Ian Dall <Ian.Dall@dsto.defence.gov.au>
+ *
+ * The driver was massively overhauled in November 1997 by Charles Hannum,
+ * fixing *many* bugs, and substantially improving performance.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/malloc.h>
+#include <sys/tty.h>
+#include <sys/time.h>
+#include <sys/kernel.h>
+#include <sys/syslog.h>
+
+#include <macppc/dev/z8530reg.h>
+#include <machine/z8530var.h>
+
+#include <dev/cons.h>
+
+#ifdef KGDB
+extern int zs_check_kgdb();
+#endif
+
+/*
+ * Allow the MD var.h to override the default CFLAG so that
+ * console messages during boot come out with correct parity.
+ */
+#ifndef	ZSTTY_DEF_CFLAG
+#define	ZSTTY_DEF_CFLAG	TTYDEF_CFLAG
+#endif
+
+/*
+ * How many input characters we can buffer.
+ * The port-specific var.h may override this.
+ * Note: must be a power of two!
+ */
+#ifndef	ZSTTY_RING_SIZE
+#define	ZSTTY_RING_SIZE	2048
+#endif
+
+/*
+ * Make this an option variable one can patch.
+ * But be warned:  this must be a power of 2!
+ */
+u_int zstty_rbuf_size = ZSTTY_RING_SIZE;
+
+/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */
+u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4;
+u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4;
+
+struct zstty_softc {
+	struct	device zst_dev;		/* required first: base device */
+	struct  tty *zst_tty;
+	struct	zs_chanstate *zst_cs;
+
+        struct timeout zst_diag_ch;
+
+	u_int zst_overflows,
+	      zst_floods,
+	      zst_errors;
+
+	int zst_hwflags,	/* see z8530var.h */
+	    zst_swflags;	/* TIOCFLAG_SOFTCAR, ... <ttycom.h> */
+
+	u_int zst_r_hiwat,
+	      zst_r_lowat;
+	u_char *volatile zst_rbget,
+	       *volatile zst_rbput;
+	volatile u_int zst_rbavail;
+	u_char *zst_rbuf,
+	       *zst_ebuf;
+
+	/*
+	 * The transmit byte count and address are used for pseudo-DMA
+	 * output in the hardware interrupt code.  PDMA can be suspended
+	 * to get pending changes done; heldtbc is used for this.  It can
+	 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state.
+	 */
+	u_char *zst_tba;		/* transmit buffer address */
+	u_int zst_tbc,			/* transmit byte count */
+	      zst_heldtbc;		/* held tbc while xmission stopped */
+
+	/* Flags to communicate with zstty_softint() */
+	volatile u_char zst_rx_flags,	/* receiver blocked */
+#define RX_TTY_BLOCKED          0x01
+#define RX_TTY_OVERFLOWED       0x02
+#define RX_IBUF_BLOCKED         0x04
+#define RX_IBUF_OVERFLOWED      0x08
+#define RX_ANY_BLOCK            0x0f
+			zst_tx_busy,	/* working on an output chunk */
+			zst_tx_done,	/* done with one output chunk */
+			zst_tx_stopped,	/* H/W level stop (lost CTS) */
+			zst_st_check,	/* got a status interrupt */
+			zst_rx_ready;
+
+	/* PPS signal on DCD, with or without inkernel clock disciplining */
+	u_char  zst_ppsmask;			/* pps signal mask */
+	u_char  zst_ppsassert;			/* pps leading edge */
+	u_char  zst_ppsclear;			/* pps trailing edge */
+};
+
+
+/* Definition of the driver for autoconfig. */
+int	zstty_match(struct device *, void *, void *);
+void	zstty_attach(struct device *, struct device *, void *);
+
+struct cfattach zstty_ca = {
+	sizeof(struct zstty_softc), zstty_match, zstty_attach
+};
+
+struct cfdriver zstty_cd = {
+	NULL, "zstty", DV_TTY
+};
+
+struct zsops zsops_tty;
+
+/* Routines called from other code. */
+cdev_decl(zs);	/* open, close, read, write, ioctl, stop, ... */
+
+void zs_shutdown(struct zstty_softc *);
+void	zsstart(struct tty *);
+int	zsparam(struct tty *, struct termios *);
+void zs_modem(struct zstty_softc *, int);
+void tiocm_to_zs(struct zstty_softc *, u_long, int);
+int  zs_to_tiocm(struct zstty_softc *);
+int    zshwiflow(struct tty *, int);
+void  zs_hwiflow(struct zstty_softc *);
+void zs_maskintr(struct zstty_softc *);
+
+/* Low-level routines. */
+void zstty_rxint(struct zs_chanstate *);
+void zstty_stint(struct zs_chanstate *, int);
+void zstty_txint(struct zs_chanstate *);
+void zstty_softint(struct zs_chanstate *);
+void zstty_diag(void *);
+
+#define ZSUNIT(x)       (minor(x) & 0x7ffff)
+#define ZSDIALOUT(x)    (minor(x) & 0x80000)
+
+/*
+ * zstty_match: how is this zs channel configured?
+ */
+int
+zstty_match(parent, match, aux)
+	struct device *parent;
+	void   *match, *aux;
+{
+	struct cfdata *cf = match;
+	struct zsc_attach_args *args = aux;
+
+	/* Exact match is better than wildcard. */
+	if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
+		return 2;
+
+	/* This driver accepts wildcard. */
+	if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT)
+		return 1;
+
+	return 0;
+}
+
+void
+zstty_attach(parent, self, aux)
+	struct device *parent, *self;
+	void   *aux;
+
+{
+	struct zsc_softc *zsc = (void *) parent;
+	struct zstty_softc *zst = (void *) self;
+	struct zsc_attach_args *args = aux;
+	struct zs_chanstate *cs;
+	struct cfdata *cf;
+	struct tty *tp;
+	int channel, s, tty_unit;
+	dev_t dev;
+	char *i, *o;
+	int maj;
+
+	cf = zst->zst_dev.dv_cfdata;
+
+        timeout_set(&zst->zst_diag_ch, zstty_diag, zst);
+
+	tty_unit = zst->zst_dev.dv_unit;
+	channel = args->channel;
+	cs = zsc->zsc_cs[channel];
+	cs->cs_private = zst;
+	cs->cs_ops = &zsops_tty;
+
+	zst->zst_cs = cs;
+	zst->zst_swflags = cf->cf_flags;	/* softcar, etc. */
+	zst->zst_hwflags = args->hwflags;
+	/* locate the major number */
+	for (maj = 0; maj < nchrdev; maj++)
+		if (cdevsw[maj].d_open == zsopen)
+			break;
+	dev = makedev(maj, tty_unit);
+
+	if (zst->zst_swflags)
+		printf(" flags 0x%x", zst->zst_swflags);
+
+	/*
+	 * Check whether we serve as a console device.
+	 * XXX - split console input/output channels aren't
+	 *       supported yet on /dev/console
+	 */
+	i = o = NULL;
+	if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) {
+		i = "input";
+		if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
+			args->consdev->cn_dev = dev;
+			cn_tab->cn_pollc = args->consdev->cn_pollc;
+			cn_tab->cn_getc = args->consdev->cn_getc;
+		}
+		cn_tab->cn_dev = dev;
+		/* Set console magic to BREAK */
+	}
+	if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) {
+		o = "output";
+		if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
+			cn_tab->cn_putc = args->consdev->cn_putc;
+		}
+		cn_tab->cn_dev = dev;
+	}
+	if (i != NULL || o != NULL)
+		printf(" (console %s)", i ? (o ? "i/o" : i) : o);
+
+#ifdef KGDB
+	/*
+	 * Allow kgdb to "take over" this port.  If this port is
+	 * NOT the kgdb port, zs_check_kgdb() will return zero.
+	 * If it IS the kgdb port, it will print "kgdb,...\n"
+	 * and then return non-zero.
+	 */
+	if (zs_check_kgdb(cs, dev)) {
+		printf(" (kgdb)\n");
+		/*
+		 * This is the kgdb port (exclusive use)
+		 * so skip the normal attach code.
+		 */
+		return;
+	}
+#endif
+
+	if (strcmp(args->type, "keyboard") == 0 ||
+	    strcmp(args->type, "mouse") == 0)
+		printf(": %s", args->type);
+
+	printf("\n");
+
+	tp = ttymalloc();
+	tp->t_dev = dev;
+	tp->t_oproc = zsstart;
+	tp->t_param = zsparam;
+	tp->t_hwiflow = zshwiflow;
+	tty_attach(tp);
+
+	zst->zst_tty = tp;
+	zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK);
+	zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1);
+	/* Disable the high water mark. */
+	zst->zst_r_hiwat = 0;
+	zst->zst_r_lowat = 0;
+	zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
+	zst->zst_rbavail = zstty_rbuf_size;
+
+	/* if there are no enable/disable functions, assume the device
+	   is always enabled */
+	if (!cs->enable)
+		cs->enabled = 1;
+
+	/*
+	 * Hardware init
+	 */
+	if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
+		/* Call zsparam similar to open. */
+		struct termios t;
+
+		/* Wait a while for previous console output to complete */
+		DELAY(10000);
+
+		/* Setup the "new" parameters in t. */
+		t.c_ispeed = 0;
+		t.c_ospeed = cs->cs_defspeed;
+		t.c_cflag = cs->cs_defcflag;
+
+		s = splzs();
+
+		/*
+		 * Turn on receiver and status interrupts.
+		 * We defer the actual write of the register to zsparam(),
+		 * but we must make sure status interrupts are turned on by
+		 * the time zsparam() reads the initial rr0 state.
+		 */
+		SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
+
+		splx(s);
+
+		/* Make sure zsparam will see changes. */
+		tp->t_ospeed = 0;
+		(void) zsparam(tp, &t);
+
+		s = splzs();
+
+		/* Make sure DTR is on now. */
+		zs_modem(zst, 1);
+
+		splx(s);
+	} else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) {
+		/* Not the console; may need reset. */
+		int reset;
+
+		reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET;
+
+		s = splzs();
+
+		zs_write_reg(cs, 9, reset);
+
+		/* Will raise DTR in open. */
+		zs_modem(zst, 0);
+
+		splx(s);
+	}
+}
+
+
+/*
+ * Return pointer to our tty.
+ */
+struct tty *
+zstty(dev)
+	dev_t dev;
+{
+	struct zstty_softc *zst;
+	int unit = minor(dev);
+
+#ifdef	DIAGNOSTIC
+	if (unit >= zstty_cd.cd_ndevs)
+		panic("zstty");
+#endif
+	zst = zstty_cd.cd_devs[unit];
+	return (zst->zst_tty);
+}
+
+
+void
+zs_shutdown(zst)
+	struct zstty_softc *zst;
+{
+	struct zs_chanstate *cs = zst->zst_cs;
+	struct tty *tp = zst->zst_tty;
+	int s;
+
+	s = splzs();
+
+	/* If we were asserting flow control, then deassert it. */
+	SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
+	zs_hwiflow(zst);
+
+	/* Clear any break condition set with TIOCSBRK. */
+	zs_break(cs, 0);
+
+	/* Turn off PPS capture on last close. */
+	zst->zst_ppsmask = 0;
+
+	/*
+	 * Hang up if necessary.  Wait a bit, so the other side has time to
+	 * notice even if we immediately open the port again.
+	 */
+	if (ISSET(tp->t_cflag, HUPCL)) {
+		zs_modem(zst, 0);
+		(void) tsleep(cs, TTIPRI, ttclos, hz);
+	}
+
+	/* Turn off interrupts if not the console. */
+	if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
+		CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
+		cs->cs_creg[1] = cs->cs_preg[1];
+		zs_write_reg(cs, 1, cs->cs_creg[1]);
+	}
+
+/* Call the power management hook. */
+	if (cs->disable) {
+#ifdef DIAGNOSTIC
+		if (!cs->enabled)
+			panic("zs_shutdown: not enabled?");
+#endif
+		(*cs->disable)(zst->zst_cs);
+	}
+
+	splx(s);
+}
+
+/*
+ * Open a zs serial (tty) port.
+ */
+int
+zsopen(dev, flags, mode, p)
+	dev_t dev;
+	int flags;
+	int mode;
+	struct proc *p;
+{
+	register struct tty *tp;
+	register struct zs_chanstate *cs;
+	struct zstty_softc *zst;
+	int s, s2;
+	int error, unit;
+
+	unit = minor(dev);
+	if (unit >= zstty_cd.cd_ndevs)
+		return (ENXIO);
+	zst = zstty_cd.cd_devs[unit];
+	if (zst == NULL)
+		return (ENXIO);
+	tp = zst->zst_tty;
+	cs = zst->zst_cs;
+
+	/* If KGDB took the line, then tp==NULL */
+	if (tp == NULL)
+		return (EBUSY);
+
+	if (ISSET(tp->t_state, TS_ISOPEN) &&
+	    ISSET(tp->t_state, TS_XCLUDE) &&
+	    p->p_ucred->cr_uid != 0)
+		return (EBUSY);
+
+	s = spltty();
+
+	/*
+	 * Do the following iff this is a first open.
+	 */
+	if (!ISSET(tp->t_state, TS_ISOPEN)) {
+		struct termios t;
+
+		tp->t_dev = dev;
+
+		/* Call the power management hook. */
+		if (cs->enable) {
+			if ((*cs->enable)(cs)) {
+				splx(s);
+				printf("%s: device enable failed\n",
+				zst->zst_dev.dv_xname);
+				return (EIO);
+			}
+		}
+
+		/*
+		 * Initialize the termios status to the defaults.  Add in the
+		 * sticky bits from TIOCSFLAGS.
+		 */
+		t.c_ispeed = 0;
+		t.c_ospeed = cs->cs_defspeed;
+		t.c_cflag = cs->cs_defcflag;
+		if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL))
+			SET(t.c_cflag, CLOCAL);
+		if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS))
+			SET(t.c_cflag, CRTSCTS);
+		if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF))
+			SET(t.c_cflag, MDMBUF);
+
+		s2 = splzs();
+
+		/*
+		 * Turn on receiver and status interrupts.
+		 * We defer the actual write of the register to zsparam(),
+		 * but we must make sure status interrupts are turned on by
+		 * the time zsparam() reads the initial rr0 state.
+		 */
+		SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
+
+		/* Clear PPS capture state on first open. */
+		zst->zst_ppsmask = 0;
+
+		splx(s2);
+
+		/* Make sure zsparam will see changes. */
+		tp->t_ospeed = 0;
+		(void) zsparam(tp, &t);
+
+		/*
+		 * Note: zsparam has done: cflag, ispeed, ospeed
+		 * so we just need to do: iflag, oflag, lflag, cc
+		 * For "raw" mode, just leave all zeros.
+		 */
+		if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) {
+			tp->t_iflag = TTYDEF_IFLAG;
+			tp->t_oflag = TTYDEF_OFLAG;
+			tp->t_lflag = TTYDEF_LFLAG;
+		} else {
+			tp->t_iflag = 0;
+			tp->t_oflag = 0;
+			tp->t_lflag = 0;
+		}
+		ttychars(tp);
+		ttsetwater(tp);
+
+		s2 = splzs();
+
+		/*
+		 * Turn on DTR.  We must always do this, even if carrier is not
+		 * present, because otherwise we'd have to use TIOCSDTR
+		 * immediately after setting CLOCAL, which applications do not
+		 * expect.  We always assert DTR while the device is open
+		 * unless explicitly requested to deassert it.
+		 */
+		zs_modem(zst, 1);
+
+		/* Clear the input ring, and unblock. */
+		zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
+		zst->zst_rbavail = zstty_rbuf_size;
+		zs_iflush(cs);
+		CLR(zst->zst_rx_flags, RX_ANY_BLOCK);
+		zs_hwiflow(zst);
+
+		splx(s2);
+	}
+
+	splx(s);
+
+	error = ((*linesw[tp->t_line].l_open)(dev, tp));
+	if (error)
+		goto bad;
+
+	return (0);
+
+bad:
+	if (!ISSET(tp->t_state, TS_ISOPEN)) {
+		/*
+		 * We failed to open the device, and nobody else had it opened.
+		 * Clean up the state as appropriate.
+		 */
+		zs_shutdown(zst);
+	}
+
+	return (error);
+}
+
+/*
+ * Close a zs serial port.
+ */
+int
+zsclose(dev, flags, mode, p)
+	dev_t dev;
+	int flags;
+	int mode;
+	struct proc *p;
+{
+	struct zstty_softc *zst;
+	register struct zs_chanstate *cs;
+	register struct tty *tp;
+
+	zst = zstty_cd.cd_devs[minor(dev)];
+	cs = zst->zst_cs;
+	tp = zst->zst_tty;
+
+	/* XXX This is for cons.c. */
+	if (!ISSET(tp->t_state, TS_ISOPEN))
+		return 0;
+
+	(*linesw[tp->t_line].l_close)(tp, flags);
+	ttyclose(tp);
+
+	if (!ISSET(tp->t_state, TS_ISOPEN)) {
+		/*
+		 * Although we got a last close, the device may still be in
+		 * use; e.g. if this was the dialout node, and there are still
+		 * processes waiting for carrier on the non-dialout node.
+		 */
+		zs_shutdown(zst);
+	}
+
+	return (0);
+}
+
+/*
+ * Read/write zs serial port.
+ */
+int
+zsread(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	struct zstty_softc *zst;
+	struct tty *tp;
+
+	zst = zstty_cd.cd_devs[minor(dev)];
+	tp = zst->zst_tty;
+
+	return (*linesw[tp->t_line].l_read)(tp, uio, flags);
+}
+
+int
+zswrite(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	struct zstty_softc *zst;
+	struct tty *tp;
+
+	zst = zstty_cd.cd_devs[minor(dev)];
+	tp = zst->zst_tty;
+
+	return (*linesw[tp->t_line].l_write)(tp, uio, flags);
+}
+
+#define TIOCFLAG_ALL (TIOCFLAG_SOFTCAR | TIOCFLAG_CLOCAL | \
+                      TIOCFLAG_CRTSCTS | TIOCFLAG_MDMBUF )
+
+int
+zsioctl(dev, cmd, data, flag, p)
+	dev_t dev;
+	u_long cmd;
+	caddr_t data;
+	int flag;
+	struct proc *p;
+{
+	struct zstty_softc *zst;
+	struct zs_chanstate *cs;
+	struct tty *tp;
+	int error;
+	int s;
+
+	zst = zstty_cd.cd_devs[minor(dev)];
+	cs = zst->zst_cs;
+	tp = zst->zst_tty;
+
+	error = ((*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p));
+	if (error >= 0)
+		return (error);
+
+	error = ttioctl(tp, cmd, data, flag, p);
+	if (error >= 0)
+		return (error);
+
+#ifdef	ZS_MD_IOCTL
+	error = ZS_MD_IOCTL;
+	if (error >= 0)
+		return (error);
+#endif	/* ZS_MD_IOCTL */
+
+	error = 0;
+
+	s = splzs();
+
+	switch (cmd) {
+	case TIOCSBRK:
+		zs_break(cs, 1);
+		break;
+
+	case TIOCCBRK:
+		zs_break(cs, 0);
+		break;
+
+	case TIOCGFLAGS:
+		*(int *)data = zst->zst_swflags;
+		break;
+
+	case TIOCSFLAGS:
+		error = suser(p->p_ucred, &p->p_acflag);
+		if (error != 0)
+			break;
+		zst->zst_swflags = *(int *)data;
+		break;
+
+	case TIOCSDTR:
+		zs_modem(zst, 1);
+		break;
+
+	case TIOCCDTR:
+		zs_modem(zst, 0);
+		break;
+
+	case TIOCMSET:
+	case TIOCMBIS:
+	case TIOCMBIC:
+		tiocm_to_zs(zst, cmd, *(int *)data);
+		break;
+
+	case TIOCMGET:
+		*(int *)data = zs_to_tiocm(zst);
+		break;
+
+	default:
+		error = ENOTTY;
+		break;
+	}
+
+	splx(s);
+
+	return (error);
+}
+
+/*
+ * Start or restart transmission.
+ */
+void
+zsstart(tp)
+	struct tty *tp;
+{
+	struct zstty_softc *zst;
+	struct zs_chanstate *cs;
+	int s;
+
+	zst = zstty_cd.cd_devs[minor(tp->t_dev)];
+	cs = zst->zst_cs;
+
+	s = spltty();
+	if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
+		goto out;
+	if (zst->zst_tx_stopped)
+		goto out;
+
+	if (tp->t_outq.c_cc <= tp->t_lowat) {
+		if (ISSET(tp->t_state, TS_ASLEEP)) {
+			CLR(tp->t_state, TS_ASLEEP);
+			wakeup((caddr_t)&tp->t_outq);
+		}
+		selwakeup(&tp->t_wsel);
+		if (tp->t_outq.c_cc == 0)
+			goto out;
+	}
+
+	/* Grab the first contiguous region of buffer space. */
+	{
+		u_char *tba;
+		int tbc;
+
+		tba = tp->t_outq.c_cf;
+		tbc = ndqb(&tp->t_outq, 0);
+
+		(void) splzs();
+
+		zst->zst_tba = tba;
+		zst->zst_tbc = tbc;
+	}
+
+	SET(tp->t_state, TS_BUSY);
+	zst->zst_tx_busy = 1;
+
+	/* Enable transmit completion interrupts if necessary. */
+	if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
+		SET(cs->cs_preg[1], ZSWR1_TIE);
+		cs->cs_creg[1] = cs->cs_preg[1];
+		zs_write_reg(cs, 1, cs->cs_creg[1]);
+	}
+
+	/* Output the first character of the contiguous buffer. */
+	{
+		zs_write_data(cs, *zst->zst_tba);
+		zst->zst_tbc--;
+		zst->zst_tba++;
+	}
+out:
+	splx(s);
+}
+
+/*
+ * Stop output, e.g., for ^S or output flush.
+ */
+int
+zsstop(tp, flag)
+	struct tty *tp;
+	int flag;
+{
+	struct zstty_softc *zst;
+	struct zs_chanstate *cs;
+	int s;
+
+	zst = zstty_cd.cd_devs[minor(tp->t_dev)];
+	cs = zst->zst_cs;
+
+	s = splzs();
+	if (ISSET(tp->t_state, TS_BUSY)) {
+		/* Stop transmitting at the next chunk. */
+		zst->zst_tbc = 0;
+		zst->zst_heldtbc = 0;
+		if (!ISSET(tp->t_state, TS_TTSTOP))
+			SET(tp->t_state, TS_FLUSH);
+	}
+	splx(s);
+	return (0);
+}
+
+/*
+ * Set ZS tty parameters from termios.
+ * XXX - Should just copy the whole termios after
+ * making sure all the changes could be done.
+ */
+int
+zsparam(tp, t)
+	struct tty *tp;
+	struct termios *t;
+{
+	struct zstty_softc *zst;
+	struct zs_chanstate *cs;
+	int ospeed, cflag;
+	u_char tmp3, tmp4, tmp5;
+	int s, error;
+
+	zst = zstty_cd.cd_devs[minor(tp->t_dev)];
+	cs = zst->zst_cs;
+
+	ospeed = t->c_ospeed;
+	cflag = t->c_cflag;
+
+	/* Check requested parameters. */
+	if (ospeed < 0)
+		return (EINVAL);
+	if (t->c_ispeed && t->c_ispeed != ospeed)
+		return (EINVAL);
+
+	/*
+	 * For the console, always force CLOCAL and !HUPCL, so that the port
+	 * is always active.
+	 */
+	if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) ||
+	    ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
+		SET(cflag, CLOCAL);
+		CLR(cflag, HUPCL);
+	}
+
+	/*
+	 * Only whack the UART when params change.
+	 * Some callers need to clear tp->t_ospeed
+	 * to make sure initialization gets done.
+	 */
+	if (tp->t_ospeed == ospeed &&
+	    tp->t_cflag == cflag)
+		return (0);
+
+	/*
+	 * Call MD functions to deal with changed
+	 * clock modes or H/W flow control modes.
+	 * The BRG divisor is set now. (reg 12,13)
+	 */
+	error = zs_set_speed(cs, ospeed);
+	if (error)
+		return (error);
+	error = zs_set_modes(cs, cflag);
+	if (error)
+		return (error);
+
+	/*
+	 * Block interrupts so that state will not
+	 * be altered until we are done setting it up.
+	 *
+	 * Initial values in cs_preg are set before
+	 * our attach routine is called.  The master
+	 * interrupt enable is handled by zsc.c
+	 */
+	s = splzs();
+
+	/*
+	 * Recalculate which status ints to enable.
+	 */
+	zs_maskintr(zst);
+
+	/* Recompute character size bits. */
+	tmp3 = cs->cs_preg[3];
+	tmp5 = cs->cs_preg[5];
+	CLR(tmp3, ZSWR3_RXSIZE);
+	CLR(tmp5, ZSWR5_TXSIZE);
+	switch (ISSET(cflag, CSIZE)) {
+	case CS5:
+		SET(tmp3, ZSWR3_RX_5);
+		SET(tmp5, ZSWR5_TX_5);
+		break;
+	case CS6:
+		SET(tmp3, ZSWR3_RX_6);
+		SET(tmp5, ZSWR5_TX_6);
+		break;
+	case CS7:
+		SET(tmp3, ZSWR3_RX_7);
+		SET(tmp5, ZSWR5_TX_7);
+		break;
+	case CS8:
+		SET(tmp3, ZSWR3_RX_8);
+		SET(tmp5, ZSWR5_TX_8);
+		break;
+	}
+	cs->cs_preg[3] = tmp3;
+	cs->cs_preg[5] = tmp5;
+
+	/*
+	 * Recompute the stop bits and parity bits.  Note that
+	 * zs_set_speed() may have set clock selection bits etc.
+	 * in wr4, so those must preserved.
+	 */
+	tmp4 = cs->cs_preg[4];
+	CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK);
+	if (ISSET(cflag, CSTOPB))
+		SET(tmp4, ZSWR4_TWOSB);
+	else
+		SET(tmp4, ZSWR4_ONESB);
+	if (!ISSET(cflag, PARODD))
+		SET(tmp4, ZSWR4_EVENP);
+	if (ISSET(cflag, PARENB))
+		SET(tmp4, ZSWR4_PARENB);
+	cs->cs_preg[4] = tmp4;
+
+	/* And copy to tty. */
+	tp->t_ispeed = 0;
+	tp->t_ospeed = ospeed;
+	tp->t_cflag = cflag;
+
+	/*
+	 * If nothing is being transmitted, set up new current values,
+	 * else mark them as pending.
+	 */
+	if (!cs->cs_heldchange) {
+		if (zst->zst_tx_busy) {
+			zst->zst_heldtbc = zst->zst_tbc;
+			zst->zst_tbc = 0;
+			cs->cs_heldchange = 1;
+		} else
+			zs_loadchannelregs(cs);
+	}
+
+	/*
+	 * If hardware flow control is disabled, turn off the buffer water
+	 * marks and unblock any soft flow control state.  Otherwise, enable
+	 * the water marks.
+	 */
+	if (!ISSET(cflag, CHWFLOW)) {
+		zst->zst_r_hiwat = 0;
+		zst->zst_r_lowat = 0;
+		if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
+			CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
+			zst->zst_rx_ready = 1;
+			cs->cs_softreq = 1;
+		}
+		if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) {
+			CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED);
+			zs_hwiflow(zst);
+		}
+	} else {
+		zst->zst_r_hiwat = zstty_rbuf_hiwat;
+		zst->zst_r_lowat = zstty_rbuf_lowat;
+	}
+
+	/*
+	 * Force a recheck of the hardware carrier and flow control status,
+	 * since we may have changed which bits we're looking at.
+	 */
+	zstty_stint(cs, 1);
+
+	splx(s);
+
+	/*
+	 * If hardware flow control is disabled, unblock any hard flow control
+	 * state.
+	 */
+	if (!ISSET(cflag, CHWFLOW)) {
+		if (zst->zst_tx_stopped) {
+			zst->zst_tx_stopped = 0;
+			zsstart(tp);
+		}
+	}
+
+	zstty_softint(cs);
+
+	return (0);
+}
+
+/*
+ * Compute interupt enable bits and set in the pending bits. Called both
+ * in zsparam() and when PPS (pulse per second timing) state changes.
+ * Must be called at splzs().
+ */
+void
+zs_maskintr(zst)
+	struct zstty_softc *zst;
+{
+	struct zs_chanstate *cs = zst->zst_cs;
+	int tmp15;
+
+	cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd;
+	if (zst->zst_ppsmask != 0)
+		cs->cs_rr0_mask |= cs->cs_rr0_pps;
+	tmp15 = cs->cs_preg[15];
+	if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD))
+		SET(tmp15, ZSWR15_DCD_IE);
+	else
+		CLR(tmp15, ZSWR15_DCD_IE);
+	if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS))
+		SET(tmp15, ZSWR15_CTS_IE);
+	else
+		CLR(tmp15, ZSWR15_CTS_IE);
+	cs->cs_preg[15] = tmp15;
+}
+
+/*
+ * Raise or lower modem control (DTR/RTS) signals.  If a character is
+ * in transmission, the change is deferred.
+ */
+void
+zs_modem(zst, onoff)
+	struct zstty_softc *zst;
+	int onoff;
+{
+	struct zs_chanstate *cs = zst->zst_cs;
+
+	if (cs->cs_wr5_dtr == 0)
+		return;
+
+	if (onoff)
+		SET(cs->cs_preg[5], cs->cs_wr5_dtr);
+	else
+		CLR(cs->cs_preg[5], cs->cs_wr5_dtr);
+
+	if (!cs->cs_heldchange) {
+		if (zst->zst_tx_busy) {
+			zst->zst_heldtbc = zst->zst_tbc;
+			zst->zst_tbc = 0;
+			cs->cs_heldchange = 1;
+		} else
+			zs_loadchannelregs(cs);
+	}
+}
+
+void
+tiocm_to_zs(zst, how, ttybits)
+	struct zstty_softc *zst;
+	u_long how;
+	int ttybits;
+{
+	struct zs_chanstate *cs = zst->zst_cs;
+	u_char zsbits;
+
+	zsbits = 0;
+	if (ISSET(ttybits, TIOCM_DTR))
+		SET(zsbits, ZSWR5_DTR);
+	if (ISSET(ttybits, TIOCM_RTS))
+		SET(zsbits, ZSWR5_RTS);
+
+	switch (how) {
+	case TIOCMBIC:
+		CLR(cs->cs_preg[5], zsbits);
+		break;
+
+	case TIOCMBIS:
+		SET(cs->cs_preg[5], zsbits);
+		break;
+
+	case TIOCMSET:
+		CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR);
+		SET(cs->cs_preg[5], zsbits);
+		break;
+	}
+
+	if (!cs->cs_heldchange) {
+		if (zst->zst_tx_busy) {
+			zst->zst_heldtbc = zst->zst_tbc;
+			zst->zst_tbc = 0;
+			cs->cs_heldchange = 1;
+		} else
+			zs_loadchannelregs(cs);
+	}
+}
+
+int
+zs_to_tiocm(zst)
+	struct zstty_softc *zst;
+{
+	struct zs_chanstate *cs = zst->zst_cs;
+	u_char zsbits;
+	int ttybits = 0;
+
+	zsbits = cs->cs_preg[5];
+	if (ISSET(zsbits, ZSWR5_DTR))
+		SET(ttybits, TIOCM_DTR);
+	if (ISSET(zsbits, ZSWR5_RTS))
+		SET(ttybits, TIOCM_RTS);
+
+	zsbits = cs->cs_rr0;
+	if (ISSET(zsbits, ZSRR0_DCD))
+		SET(ttybits, TIOCM_CD);
+	if (ISSET(zsbits, ZSRR0_CTS))
+		SET(ttybits, TIOCM_CTS);
+
+	return (ttybits);
+}
+
+/*
+ * Try to block or unblock input using hardware flow-control.
+ * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and
+ * if this function returns non-zero, the TS_TBLOCK flag will
+ * be set or cleared according to the "block" arg passed.
+ */
+int
+zshwiflow(tp, block)
+	struct tty *tp;
+	int block;
+{
+	struct zstty_softc *zst;
+	struct zs_chanstate *cs;
+	int s;
+
+	zst = zstty_cd.cd_devs[minor(tp->t_dev)];
+	cs = zst->zst_cs;
+
+	if (cs->cs_wr5_rts == 0)
+		return (0);
+
+	s = splzs();
+	if (block) {
+		if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
+			SET(zst->zst_rx_flags, RX_TTY_BLOCKED);
+			zs_hwiflow(zst);
+		}
+	} else {
+		if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
+			CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
+			zst->zst_rx_ready = 1;
+			cs->cs_softreq = 1;
+		}
+		if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
+			CLR(zst->zst_rx_flags, RX_TTY_BLOCKED);
+			zs_hwiflow(zst);
+		}
+	}
+	splx(s);
+	return (1);
+}
+
+/*
+ * Internal version of zshwiflow
+ * called at splzs
+ */
+void
+zs_hwiflow(zst)
+	struct zstty_softc *zst;
+{
+	struct zs_chanstate *cs = zst->zst_cs;
+
+	if (cs->cs_wr5_rts == 0)
+		return;
+
+	if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) {
+		CLR(cs->cs_preg[5], cs->cs_wr5_rts);
+		CLR(cs->cs_creg[5], cs->cs_wr5_rts);
+	} else {
+		SET(cs->cs_preg[5], cs->cs_wr5_rts);
+		SET(cs->cs_creg[5], cs->cs_wr5_rts);
+	}
+	zs_write_reg(cs, 5, cs->cs_creg[5]);
+}
+
+
+/****************************************************************
+ * Interface to the lower layer (zscc)
+ ****************************************************************/
+
+void zstty_rxsoft(struct zstty_softc *, struct tty *);
+void zstty_txsoft(struct zstty_softc *, struct tty *);
+void zstty_stsoft(struct zstty_softc *, struct tty *);
+
+/*
+ * receiver ready interrupt.
+ * called at splzs
+ */
+void
+zstty_rxint(cs)
+	struct zs_chanstate *cs;
+{
+	struct zstty_softc *zst = cs->cs_private;
+	u_char *put, *end;
+	u_int cc;
+	u_char rr0, rr1, c;
+
+	end = zst->zst_ebuf;
+	put = zst->zst_rbput;
+	cc = zst->zst_rbavail;
+
+	while (cc > 0) {
+		/*
+		 * First read the status, because reading the received char
+		 * destroys the status of this char.
+		 */
+		rr1 = zs_read_reg(cs, 1);
+		c = zs_read_data(cs);
+
+		if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
+			/* Clear the receive error. */
+			zs_write_csr(cs, ZSWR0_RESET_ERRORS);
+		}
+
+		put[0] = c;
+		put[1] = rr1;
+		put += 2;
+		if (put >= end)
+			put = zst->zst_rbuf;
+		cc--;
+
+		rr0 = zs_read_csr(cs);
+		if (!ISSET(rr0, ZSRR0_RX_READY))
+			break;
+	}
+
+	/*
+	 * Current string of incoming characters ended because
+	 * no more data was available or we ran out of space.
+	 * Schedule a receive event if any data was received.
+	 * If we're out of space, turn off receive interrupts.
+	 */
+	zst->zst_rbput = put;
+	zst->zst_rbavail = cc;
+	if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
+		zst->zst_rx_ready = 1;
+		cs->cs_softreq = 1;
+	}
+
+	/*
+	 * See if we are in danger of overflowing a buffer. If
+	 * so, use hardware flow control to ease the pressure.
+	 */
+	if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) &&
+	    cc < zst->zst_r_hiwat) {
+		SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
+		zs_hwiflow(zst);
+	}
+
+	/*
+	 * If we're out of space, disable receive interrupts
+	 * until the queue has drained a bit.
+	 */
+	if (!cc) {
+		SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
+		CLR(cs->cs_preg[1], ZSWR1_RIE);
+		cs->cs_creg[1] = cs->cs_preg[1];
+		zs_write_reg(cs, 1, cs->cs_creg[1]);
+	}
+}
+
+/*
+ * transmitter ready interrupt.  (splzs)
+ */
+void
+zstty_txint(cs)
+	struct zs_chanstate *cs;
+{
+	struct zstty_softc *zst = cs->cs_private;
+
+	/*
+	 * If we've delayed a parameter change, do it now, and restart
+	 * output.
+	 */
+	if (cs->cs_heldchange) {
+		zs_loadchannelregs(cs);
+		cs->cs_heldchange = 0;
+		zst->zst_tbc = zst->zst_heldtbc;
+		zst->zst_heldtbc = 0;
+	}
+
+	/* Output the next character in the buffer, if any. */
+	if (zst->zst_tbc > 0) {
+		zs_write_data(cs, *zst->zst_tba);
+		zst->zst_tbc--;
+		zst->zst_tba++;
+	} else {
+		/* Disable transmit completion interrupts if necessary. */
+		if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
+			CLR(cs->cs_preg[1], ZSWR1_TIE);
+			cs->cs_creg[1] = cs->cs_preg[1];
+			zs_write_reg(cs, 1, cs->cs_creg[1]);
+		}
+		if (zst->zst_tx_busy) {
+			zst->zst_tx_busy = 0;
+			zst->zst_tx_done = 1;
+			cs->cs_softreq = 1;
+		}
+	}
+}
+
+#ifdef DDB
+#include <ddb/db_var.h>
+#define	DB_CONSOLE	db_console
+#else
+#define	DB_CONSOLE	1
+#endif
+
+/*
+ * status change interrupt.  (splzs)
+ */
+void
+zstty_stint(cs, force)
+	struct zs_chanstate *cs;
+	int force;
+{
+	struct zstty_softc *zst = cs->cs_private;
+	u_char rr0, delta;
+
+	rr0 = zs_read_csr(cs);
+	zs_write_csr(cs, ZSWR0_RESET_STATUS);
+
+	/*
+	 * Check here for console break, so that we can abort
+	 * even when interrupts are locking up the machine.
+	 */
+	if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) &&
+	    ISSET(rr0, ZSRR0_BREAK) && DB_CONSOLE)
+		zs_abort(cs);
+
+	if (!force)
+		delta = rr0 ^ cs->cs_rr0;
+	else
+		delta = cs->cs_rr0_mask;
+	cs->cs_rr0 = rr0;
+
+	if (ISSET(delta, cs->cs_rr0_mask)) {
+		SET(cs->cs_rr0_delta, delta);
+
+		/*
+		 * Stop output immediately if we lose the output
+		 * flow control signal or carrier detect.
+		 */
+		if (ISSET(~rr0, cs->cs_rr0_mask)) {
+			zst->zst_tbc = 0;
+			zst->zst_heldtbc = 0;
+		}
+
+		zst->zst_st_check = 1;
+		cs->cs_softreq = 1;
+	}
+}
+
+void
+zstty_diag(arg)
+	void *arg;
+{
+	struct zstty_softc *zst = arg;
+	int overflows, floods;
+	int s;
+
+	s = splzs();
+	overflows = zst->zst_overflows;
+	zst->zst_overflows = 0;
+	floods = zst->zst_floods;
+	zst->zst_floods = 0;
+	zst->zst_errors = 0;
+	splx(s);
+
+	log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
+	    zst->zst_dev.dv_xname,
+	    overflows, overflows == 1 ? "" : "s",
+	    floods, floods == 1 ? "" : "s");
+}
+
+void
+zstty_rxsoft(zst, tp)
+	struct zstty_softc *zst;
+	struct tty *tp;
+{
+	struct zs_chanstate *cs = zst->zst_cs;
+	int (*rint)(int c, struct tty *tp) = linesw[tp->t_line].l_rint;
+	u_char *get, *end;
+	u_int cc, scc;
+	u_char rr1;
+	int code;
+	int s;
+
+	end = zst->zst_ebuf;
+	get = zst->zst_rbget;
+	scc = cc = zstty_rbuf_size - zst->zst_rbavail;
+
+	if (cc == zstty_rbuf_size) {
+		zst->zst_floods++;
+		if (zst->zst_errors++ == 0)
+			timeout_add(&zst->zst_diag_ch, 60 * hz);
+	}
+
+	/* If not yet open, drop the entire buffer content here */
+	if (!ISSET(tp->t_state, TS_ISOPEN)) {
+		get += cc << 1;
+		if (get >= end)
+			get -= zstty_rbuf_size << 1;
+		cc = 0;
+	}
+	while (cc) {
+		code = get[0];
+		rr1 = get[1];
+		if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) {
+			if (ISSET(rr1, ZSRR1_DO)) {
+				zst->zst_overflows++;
+				if (zst->zst_errors++ == 0)
+					timeout_add(&zst->zst_diag_ch, 60 * hz);
+			}
+			if (ISSET(rr1, ZSRR1_FE))
+				SET(code, TTY_FE);
+			if (ISSET(rr1, ZSRR1_PE))
+				SET(code, TTY_PE);
+		}
+		if ((*rint)(code, tp) == -1) {
+			/*
+			 * The line discipline's buffer is out of space.
+			 */
+			if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
+				/*
+				 * We're either not using flow control, or the
+				 * line discipline didn't tell us to block for
+				 * some reason.  Either way, we have no way to
+				 * know when there's more space available, so
+				 * just drop the rest of the data.
+				 */
+				get += cc << 1;
+				if (get >= end)
+					get -= zstty_rbuf_size << 1;
+				cc = 0;
+			} else {
+				/*
+				 * Don't schedule any more receive processing
+				 * until the line discipline tells us there's
+				 * space available (through comhwiflow()).
+				 * Leave the rest of the data in the input
+				 * buffer.
+				 */
+				SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
+			}
+			break;
+		}
+		get += 2;
+		if (get >= end)
+			get = zst->zst_rbuf;
+		cc--;
+	}
+
+	if (cc != scc) {
+		zst->zst_rbget = get;
+		s = splzs();
+		cc = zst->zst_rbavail += scc - cc;
+		/* Buffers should be ok again, release possible block. */
+		if (cc >= zst->zst_r_lowat) {
+			if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) {
+				CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
+				SET(cs->cs_preg[1], ZSWR1_RIE);
+				cs->cs_creg[1] = cs->cs_preg[1];
+				zs_write_reg(cs, 1, cs->cs_creg[1]);
+			}
+			if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) {
+				CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED);
+				zs_hwiflow(zst);
+			}
+		}
+		splx(s);
+	}
+}
+
+void
+zstty_txsoft(zst, tp)
+	struct zstty_softc *zst;
+	struct tty *tp;
+{
+
+	CLR(tp->t_state, TS_BUSY);
+	if (ISSET(tp->t_state, TS_FLUSH))
+		CLR(tp->t_state, TS_FLUSH);
+	else
+		ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf));
+	(*linesw[tp->t_line].l_start)(tp);
+}
+
+void
+zstty_stsoft(zst, tp)
+	struct zstty_softc *zst;
+	struct tty *tp;
+{
+	struct zs_chanstate *cs = zst->zst_cs;
+	u_char rr0, delta;
+	int s;
+
+	s = splzs();
+	rr0 = cs->cs_rr0;
+	delta = cs->cs_rr0_delta;
+	cs->cs_rr0_delta = 0;
+	splx(s);
+
+	if (ISSET(delta, cs->cs_rr0_dcd)) {
+		/*
+		 * Inform the tty layer that carrier detect changed.
+		 */
+		(void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD));
+	}
+
+	if (ISSET(delta, cs->cs_rr0_cts)) {
+		/* Block or unblock output according to flow control. */
+		if (ISSET(rr0, cs->cs_rr0_cts)) {
+			zst->zst_tx_stopped = 0;
+			(*linesw[tp->t_line].l_start)(tp);
+		} else {
+			zst->zst_tx_stopped = 1;
+		}
+	}
+}
+
+/*
+ * Software interrupt.  Called at zssoft
+ *
+ * The main job to be done here is to empty the input ring
+ * by passing its contents up to the tty layer.  The ring is
+ * always emptied during this operation, therefore the ring
+ * must not be larger than the space after "high water" in
+ * the tty layer, or the tty layer might drop our input.
+ *
+ * Note: an "input blockage" condition is assumed to exist if
+ * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set.
+ */
+void
+zstty_softint(cs)
+	struct zs_chanstate *cs;
+{
+	struct zstty_softc *zst = cs->cs_private;
+	struct tty *tp = zst->zst_tty;
+	int s;
+
+	s = spltty();
+
+	if (zst->zst_rx_ready) {
+		zst->zst_rx_ready = 0;
+		zstty_rxsoft(zst, tp);
+	}
+
+	if (zst->zst_st_check) {
+		zst->zst_st_check = 0;
+		zstty_stsoft(zst, tp);
+	}
+
+	if (zst->zst_tx_done) {
+		zst->zst_tx_done = 0;
+		zstty_txsoft(zst, tp);
+	}
+
+	splx(s);
+}
+
+struct zsops zsops_tty = {
+	zstty_rxint,	/* receive char available */
+	zstty_stint,	/* external/status */
+	zstty_txint,	/* xmit buffer empty */
+	zstty_softint,	/* process software interrupt */
+};
diff --git a/sys/arch/macppc/dev/zs.c b/sys/arch/macppc/dev/zs.c
index 4d7cfebdee6..03803abc61b 100644
--- a/sys/arch/macppc/dev/zs.c
+++ b/sys/arch/macppc/dev/zs.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: zs.c,v 1.6 2002/03/14 01:26:36 millert Exp $	*/
+/*	$OpenBSD: zs.c,v 1.7 2002/09/06 13:56:51 drahn Exp $	*/
 /*	$NetBSD: zs.c,v 1.17 2001/06/19 13:42:15 wiz Exp $	*/
 
 /*
@@ -79,15 +79,12 @@
 #define ZSMAC_RAW	0x01
 #define ZSMAC_LOCALTALK	0x02
 
-#define	PCLK	(9600 * 384)
-
 #include "zsc.h"	/* get the # of zs chips defined */
 
 /*
  * Some warts needed by z8530tty.c -
  */
 int zs_def_cflag = (CREAD | CS8 | HUPCL);
-int zs_major = 12;
 
 /*
  * abort detection on console will now timeout after iterating on a loop
@@ -96,13 +93,6 @@ int zs_major = 12;
  */
 #define ZSABORT_DELAY 3000000
 
-/* The layout of this is hardware-dependent (padding, order). */
-struct zschan {
-	volatile u_char	zc_csr;		/* ctrl,status, and indirect access */
-	u_char		zc_xxx0[15];
-	volatile u_char	zc_data;	/* data */
-	u_char		zc_xxx1[15];
-};
 struct zsdevice {
 	/* Yes, they are backwards. */
 	struct	zschan zs_chan_b;
@@ -128,7 +118,7 @@ int	zs_cons_canabort = 0;
 /* device to which the console is attached--if serial. */
 /* Mac stuff */
 
-static int zs_get_speed(struct zs_chanstate *);
+int zs_get_speed(struct zs_chanstate *);
 
 /*
  * Even though zsparam will set up the clock multiples, etc., we
@@ -169,6 +159,10 @@ int	zsc_match(struct device *, void *, void *);
 void	zsc_attach(struct device *, struct device *, void *);
 int	zsc_print(void *, const char *name);
 
+/* Power management hooks */
+int  zs_enable (struct zs_chanstate *);
+void zs_disable (struct zs_chanstate *);
+
 struct cfattach zsc_ca = {
 	sizeof(struct zsc_softc), zsc_match, zsc_attach
 };
@@ -178,7 +172,7 @@ extern struct cfdriver zsc_cd;
 int zshard(void *);
 int zssoft(void *);
 #ifdef ZS_TXDMA
-static int zs_txdma_int(void *);
+int zs_txdma_int(void *);
 #endif
 
 void zscnprobe(struct consdev *);
@@ -224,13 +218,16 @@ zsc_attach(parent, self, aux)
 	struct confargs *ca = aux;
 	struct zsc_attach_args zsc_args;
 	volatile struct zschan *zc;
+	struct xzs_chanstate *xcs;
 	struct zs_chanstate *cs;
 	struct zsdevice *zsd;
-	int channel;
+	int zsc_unit, channel;
 	int s, theflags;
 	int node, intr[3][3];
 	u_int regs[16];
 
+	zsc_unit = zsc->zsc_dev.dv_unit;
+
 	zsd = mapiodev(ca->ca_baseaddr + ca->ca_reg[0], ca->ca_reg[1]);
 	node = OF_child(ca->ca_node);	/* ch-a */
 
@@ -267,8 +264,10 @@ zsc_attach(parent, self, aux)
 	 */
 	for (channel = 0; channel < 2; channel++) {
 		zsc_args.channel = channel;
-		zsc_args.hwflags = zs_hwflags[0][channel];
-		cs = &zsc->zsc_cs[channel];
+		zsc_args.hwflags = zs_hwflags[zsc_unit][channel];
+		xcs = &zsc->xzsc_xcs_store[channel];
+		cs  = &xcs->xzs_cs;
+		zsc->zsc_cs[channel] = cs;
 
 		cs->cs_channel = channel;
 		cs->cs_private = NULL;
@@ -283,12 +282,25 @@ zsc_attach(parent, self, aux)
 		memcpy(cs->cs_preg, zs_init_reg, 16);
 
 		/* Current BAUD rate generator clock. */
-		cs->cs_brg_clk = PCLK / 16;	/* RTxC is 230400*16, so use 230400 */
+		/* RTxC is 230400*16, so use 230400 */
+		cs->cs_brg_clk = PCLK / 16;
 		if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE)
 			cs->cs_defspeed = zs_get_speed(cs);
 		else
-			cs->cs_defspeed = zs_defspeed[0][channel];
-#ifdef NOTYET
+			cs->cs_defspeed =
+			    zs_defspeed[zsc_unit][channel];
+		cs->cs_defcflag = zs_def_cflag;
+
+		/* Make these correspond to cs_defcflag (-crtscts) */
+		cs->cs_rr0_dcd = ZSRR0_DCD;
+		cs->cs_rr0_cts = 0;
+		cs->cs_wr5_dtr = ZSWR5_DTR;
+		cs->cs_wr5_rts = 0;
+
+#ifdef __notyet__
+		cs->cs_slave_type = ZS_SLAVE_NONE;
+#endif
+
 		/* Define BAUD rate stuff. */
 		xcs->cs_clocks[0].clk = PCLK;
 		xcs->cs_clocks[0].flags = ZSC_RTXBRG | ZSC_RTXDIV;
@@ -316,13 +328,22 @@ zsc_attach(parent, self, aux)
 			xcs->cs_clocks[1].clk = 0;
 			xcs->cs_clocks[2].clk = 0;
 		}
+		if (xcs->cs_clocks[1].clk)
+			zsc_args.hwflags |= ZS_HWFLAG_NO_DCD;
+		if (xcs->cs_clocks[2].clk)
+			zsc_args.hwflags |= ZS_HWFLAG_NO_CTS;
 
 		/* Set defaults in our "extended" chanstate. */
 		xcs->cs_csource = 0;
 		xcs->cs_psource = 0;
 		xcs->cs_cclk_flag = 0;  /* Nothing fancy by default */
 		xcs->cs_pclk_flag = 0;
-#endif
+
+		if (theflags & ZSMAC_RAW) {
+			zsc_args.hwflags |= ZS_HWFLAG_RAW;
+			printf(" (raw defaults)");
+		}
+
 		/*
 		 * XXX - This might be better done with a "stub" driver
 		 * (to replace zstty) that ignores LocalTalk for now.
@@ -341,6 +362,16 @@ zsc_attach(parent, self, aux)
 		}
 
 		/*
+		 * We used to disable chip interrupts here, but we now
+		 * do that in zscnprobe, just in case MacOS left the chip on.
+		 */
+		
+		xcs->cs_chip = 0;
+		
+		/* Stash away a copy of the final H/W flags. */
+		xcs->cs_hwflags = zsc_args.hwflags;
+		
+		/*
 		 * Look for a child driver for this channel.
 		 * The child attach will setup the hardware.
 		 */
@@ -356,27 +387,31 @@ zsc_attach(parent, self, aux)
 
 	/* XXX - Now safe to install interrupt handlers. */
 	mac_intr_establish(parent, intr[0][0], IST_LEVEL, IPL_TTY,
-	    zshard, NULL, "zs");
+	    zshard, NULL, "zs0");
 	mac_intr_establish(parent, intr[1][0], IST_LEVEL, IPL_TTY,
-	    zshard, NULL, "zs");
+	    zshard, NULL, "zs1");
 #ifdef ZS_TXDMA
 	mac_intr_establish(parent, intr[0][1], IST_LEVEL, IPL_TTY,
-	    zs_txdma_int, (void *)0, "zs");
+	    zs_txdma_int, (void *)0, "zsdma0");
 	mac_intr_establish(parent, intr[1][1], IST_LEVEL, IPL_TTY,
-	    zs_txdma_int, (void *)1, "zs");
+	    zs_txdma_int, (void *)1, "zsdma1");
 #endif
 
 	/*
 	 * Set the master interrupt enable and interrupt vector.
 	 * (common to both channels, do it on A)
 	 */
-	cs = &zsc->zsc_cs[0];
+	cs = zsc->zsc_cs[0];
 	s = splzs();
 	/* interrupt vector */
 	zs_write_reg(cs, 2, zs_init_reg[2]);
 	/* master interrupt control (enable) */
 	zs_write_reg(cs, 9, zs_init_reg[9]);
 	splx(s);
+
+	/* connect power management for port 0 */
+	cs->enable = zs_enable;
+	cs->disable = zs_disable;
 }
 
 int
@@ -445,7 +480,7 @@ zshard(arg)
 		if (zsc == NULL)
 			continue;
 		rval |= zsc_intr_hard(zsc);
-		if (zsc->zsc_cs->cs_softreq)
+		if (zsc->zsc_cs[0]->cs_softreq)
 		{
 			/* zsc_req_softint(zsc); */
 			/* We are at splzs here, so no need to lock. */
@@ -555,6 +590,247 @@ zs_get_speed(cs)
 	return TCONST_TO_BPS(cs->cs_brg_clk, tconst);
 }
 
+#ifndef ZS_TOLERANCE
+#define ZS_TOLERANCE 51
+/* 5% in tenths of a %, plus 1 so that exactly 5% will be ok. */
+#endif
+
+/*
+ * Search through the signal sources in the channel, and
+ * pick the best one for the baud rate requested. Return
+ * a -1 if not achievable in tolerance. Otherwise return 0
+ * and fill in the values.
+ *
+ * This routine draws inspiration from the Atari port's zs.c
+ * driver in NetBSD 1.1 which did the same type of source switching.
+ * Tolerance code inspired by comspeed routine in isa/com.c.
+ *
+ * By Bill Studenmund, 1996-05-12
+ */
+int
+zs_set_speed(cs, bps)
+	struct zs_chanstate *cs;
+	int bps;	/* bits per second */
+{
+	struct xzs_chanstate *xcs = (void *)cs;
+	int i, tc, tc0 = 0, tc1, s, sf = 0;
+	int src, rate0, rate1, err, tol;
+
+	if (bps == 0)
+		return (0);
+
+	src = -1;		/* no valid source yet */
+	tol = ZS_TOLERANCE;
+
+	/*
+	 * Step through all the sources and see which one matches
+	 * the best. A source has to match BETTER than tol to be chosen.
+	 * Thus if two sources give the same error, the first one will be
+	 * chosen. Also, allow for the possability that one source might run
+	 * both the BRG and the direct divider (i.e. RTxC).
+	 */
+	for (i = 0; i < xcs->cs_clock_count; i++) {
+		if (xcs->cs_clocks[i].clk <= 0)
+			continue;	/* skip non-existent or bad clocks */
+		if (xcs->cs_clocks[i].flags & ZSC_BRG) {
+			/* check out BRG at /16 */
+			tc1 = BPS_TO_TCONST(xcs->cs_clocks[i].clk >> 4, bps);
+			if (tc1 >= 0) {
+				rate1 = TCONST_TO_BPS(xcs->cs_clocks[i].clk >> 4, tc1);
+				err = abs(((rate1 - bps)*1000)/bps);
+				if (err < tol) {
+					tol = err;
+					src = i;
+					sf = xcs->cs_clocks[i].flags & ~ZSC_DIV;
+					tc0 = tc1;
+					rate0 = rate1;
+				}
+			}
+		}
+		if (xcs->cs_clocks[i].flags & ZSC_DIV) {
+			/*
+			 * Check out either /1, /16, /32, or /64
+			 * Note: for /1, you'd better be using a synchronized
+			 * clock!
+			 */
+			int b0 = xcs->cs_clocks[i].clk, e0 = abs(b0-bps);
+			int b1 = b0 >> 4, e1 = abs(b1-bps);
+			int b2 = b1 >> 1, e2 = abs(b2-bps);
+			int b3 = b2 >> 1, e3 = abs(b3-bps);
+
+			if (e0 < e1 && e0 < e2 && e0 < e3) {
+				err = e0;
+				rate1 = b0;
+				tc1 = ZSWR4_CLK_X1;
+			} else if (e0 > e1 && e1 < e2  && e1 < e3) {
+				err = e1;
+				rate1 = b1;
+				tc1 = ZSWR4_CLK_X16;
+			} else if (e0 > e2 && e1 > e2 && e2 < e3) {
+				err = e2;
+				rate1 = b2;
+				tc1 = ZSWR4_CLK_X32;
+			} else {
+				err = e3;
+				rate1 = b3;
+				tc1 = ZSWR4_CLK_X64;
+			}
+
+			err = (err * 1000)/bps;
+			if (err < tol) {
+				tol = err;
+				src = i;
+				sf = xcs->cs_clocks[i].flags & ~ZSC_BRG;
+				tc0 = tc1;
+				rate0 = rate1;
+			}
+		}
+	}
+#ifdef ZSMACDEBUG
+	zsprintf("Checking for rate %d. Found source #%d.\n",bps, src);
+#endif
+	if (src == -1)
+		return (EINVAL); /* no can do */
+
+	/*
+	 * The M.I. layer likes to keep cs_brg_clk current, even though
+	 * we are the only ones who should be touching the BRG's rate.
+	 *
+	 * Note: we are assuming that any ZSC_EXTERN signal source comes in
+	 * on the RTxC pin. Correct for the mac68k obio zsc.
+	 */
+	if (sf & ZSC_EXTERN)
+		cs->cs_brg_clk = xcs->cs_clocks[i].clk >> 4;
+	else
+		cs->cs_brg_clk = PCLK / 16;
+
+	/*
+	 * Now we have a source, so set it up.
+	 */
+	s = splzs();
+	xcs->cs_psource = src;
+	xcs->cs_pclk_flag = sf;
+	bps = rate0;
+	if (sf & ZSC_BRG) {
+		cs->cs_preg[4] = ZSWR4_CLK_X16;
+		cs->cs_preg[11]= ZSWR11_RXCLK_BAUD | ZSWR11_TXCLK_BAUD;
+		if (sf & ZSC_PCLK) {
+			cs->cs_preg[14] = ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK;
+		} else {
+			cs->cs_preg[14] = ZSWR14_BAUD_ENA;
+		}
+		tc = tc0;
+	} else {
+		cs->cs_preg[4] = tc0;
+		if (sf & ZSC_RTXDIV) {
+			cs->cs_preg[11] = ZSWR11_RXCLK_RTXC | ZSWR11_TXCLK_RTXC;
+		} else {
+			cs->cs_preg[11] = ZSWR11_RXCLK_TRXC | ZSWR11_TXCLK_TRXC;
+		}
+		cs->cs_preg[14]= 0;
+		tc = 0xffff;
+	}
+	/* Set the BAUD rate divisor. */
+	cs->cs_preg[12] = tc;
+	cs->cs_preg[13] = tc >> 8;
+	splx(s);
+
+#ifdef ZSMACDEBUG
+	zsprintf("Rate is %7d, tc is %7d, source no. %2d, flags %4x\n", \
+	    bps, tc, src, sf);
+	zsprintf("Registers are: 4 %x, 11 %x, 14 %x\n\n",
+		cs->cs_preg[4], cs->cs_preg[11], cs->cs_preg[14]);
+#endif
+
+	cs->cs_preg[5] |= ZSWR5_RTS;	/* Make sure the drivers are on! */
+
+	/* Caller will stuff the pending registers. */
+	return (0);
+}
+
+int
+zs_set_modes(cs, cflag)
+	struct zs_chanstate *cs;
+	int cflag;	/* bits per second */
+{
+	struct xzs_chanstate *xcs = (void*)cs;
+	int s;
+
+	/*
+	 * Make sure we don't enable hfc on a signal line we're ignoring.
+	 * As we enable CTS interrupts only if we have CRTSCTS or CDTRCTS,
+	 * this code also effectivly turns off ZSWR15_CTS_IE.
+	 *
+	 * Also, disable DCD interrupts if we've been told to ignore
+	 * the DCD pin. Happens on mac68k because the input line for
+	 * DCD can also be used as a clock input.  (Just set CLOCAL.)
+	 *
+	 * If someone tries to turn an invalid flow mode on, Just Say No
+	 * (Suggested by gwr)
+	 */
+	if (xcs->cs_hwflags & ZS_HWFLAG_NO_DCD) {
+		if (cflag & MDMBUF)
+		printf(" opps\n");
+		if (cflag & MDMBUF)
+			return (EINVAL);
+		cflag |= CLOCAL;
+	}
+#if 0
+	if ((xcs->cs_hwflags & ZS_HWFLAG_NO_CTS) && (cflag & CRTSCTS))
+		return (EINVAL);
+#endif
+
+	/*
+	 * Output hardware flow control on the chip is horrendous:
+	 * if carrier detect drops, the receiver is disabled, and if
+	 * CTS drops, the transmitter is stoped IN MID CHARACTER!
+	 * Therefore, NEVER set the HFC bit, and instead use the
+	 * status interrupt to detect CTS changes.
+	 */
+	s = splzs();
+	if ((cflag & (CLOCAL | MDMBUF)) != 0)
+		cs->cs_rr0_dcd = 0;
+	else
+		cs->cs_rr0_dcd = ZSRR0_DCD;
+	/*
+	 * The mac hardware only has one output, DTR (HSKo in Mac
+	 * parlance). In HFC mode, we use it for the functions
+	 * typically served by RTS and DTR on other ports, so we
+	 * have to fake the upper layer out some.
+	 *
+	 * CRTSCTS we use CTS as an input which tells us when to shut up.
+	 * We make no effort to shut up the other side of the connection.
+	 * DTR is used to hang up the modem.
+	 *
+	 * In CDTRCTS, we use CTS to tell us to stop, but we use DTR to
+	 * shut up the other side.
+	 */
+	if ((cflag & CRTSCTS) != 0) {
+		cs->cs_wr5_dtr = ZSWR5_DTR;
+		cs->cs_wr5_rts = 0;
+		cs->cs_rr0_cts = ZSRR0_CTS;
+#if 0
+	} else if ((cflag & CDTRCTS) != 0) {
+		cs->cs_wr5_dtr = 0;
+		cs->cs_wr5_rts = ZSWR5_DTR;
+		cs->cs_rr0_cts = ZSRR0_CTS;
+#endif
+	} else if ((cflag & MDMBUF) != 0) {
+		cs->cs_wr5_dtr = 0;
+		cs->cs_wr5_rts = ZSWR5_DTR;
+		cs->cs_rr0_cts = ZSRR0_DCD;
+	} else {
+		cs->cs_wr5_dtr = ZSWR5_DTR;
+		cs->cs_wr5_rts = 0;
+		cs->cs_rr0_cts = 0;
+	}
+	splx(s);
+
+	/* Caller will stuff the pending registers. */
+	return (0);
+}
+
+
 /*
  * Read or write the chip with suitable delays.
  * MacII hardware has the delay built in.
@@ -627,6 +903,33 @@ void  zs_write_data(cs, val)
 	ZS_DELAY();
 }
 
+/*
+ * Power management hooks for zsopen() and zsclose().
+ * We use them to power on/off the ports, if necessary.
+ * This should be modified to turn on/off modem in PBG4, etc.
+ */
+void macobio_modem_power(int enable);
+int zs_enable(struct zs_chanstate *cs);
+void zs_disable(struct zs_chanstate *cs);
+
+int
+zs_enable(cs)
+	struct zs_chanstate *cs;
+{
+	macobio_modem_power(1); /* Whee */
+	cs->enabled = 1;
+	return(0);
+}
+ 
+void
+zs_disable(cs)
+	struct zs_chanstate *cs;
+{
+	macobio_modem_power(0); /* Whee */
+	cs->enabled = 0;
+}
+
+
 /****************************************************************
  * Console support functions (powermac specific!)
  * Note: this code is allowed to know about the layout of
@@ -635,11 +938,10 @@ void  zs_write_data(cs, val)
  * XXX - Well :-P  :-)  -wrs
  ****************************************************************/
 
-#define zscnpollc	nullcnpollc
 cons_decl(zs);
 
-static void	zs_putc(register volatile struct zschan *, int);
-static int	zs_getc(register volatile struct zschan *);
+void	zs_putc(register volatile struct zschan *, int);
+int	zs_getc(register volatile struct zschan *);
 extern int	zsopen( dev_t dev, int flags, int mode, struct proc *p);
 
 static int stdin, stdout;
@@ -753,24 +1055,13 @@ zscnputc(dev, c)
 	}
 }
 
-extern int ofccngetc(dev_t);
-extern void ofccnputc(dev_t, int);
-
-struct consdev consdev_zs = {
-	zscnprobe,
-	zscninit,
-	zscngetc,
-	zscnputc,
-	zscnpollc,
-	NULL,
-};
-
 void
 zscnprobe(cp)
 	struct consdev *cp;
 {
 	int chosen, pkg;
 	int unit = 0;
+	int maj;
 	char name[16];
 
 	if ((chosen = OF_finddevice("/chosen")) == -1)
@@ -798,15 +1089,22 @@ zscnprobe(cp)
 	if (strcmp(name, "ch-b") == 0)
 		unit = 1;
 
-	cp->cn_dev = makedev(zs_major, unit);
+	/* locate the major number */
+	for (maj = 0; maj < nchrdev; maj++)
+		if (cdevsw[maj].d_open == zsopen)
+			break;
+
+	cp->cn_dev = makedev(maj, unit);
 	cp->cn_pri = CN_REMOTE;
 }
 
+
 void
 zscninit(cp)
 	struct consdev *cp;
 {
-	int escc, escc_ch, obio, zs_offset, zs_size;
+	int escc, escc_ch, obio;
+	unsigned int zs_offset, zs_size;
 	int ch = 0;
 	u_int32_t reg[5];
 	char name[16];
@@ -821,7 +1119,7 @@ zscninit(cp)
 	if (strcmp(name, "ch-b") == 0)
 		ch = 1;
 
-	if (OF_getprop(escc_ch, "reg", reg, sizeof(reg)) < 4)
+	if (OF_getprop(escc_ch, "reg", reg, sizeof(reg)) < 8)
 		return;
 	zs_offset = reg[0];
 	zs_size   = reg[1];
@@ -837,7 +1135,29 @@ zscninit(cp)
 }
 
 void
-zs_abort()
+zs_abort(struct zs_chanstate *channel)
 {
 
 }
+
+/* copied from sparc - XXX? */
+void
+zscnpollc(dev, on)
+        dev_t dev;
+	int on;  
+{
+	/*
+	 * Need to tell zs driver to acknowledge all interrupts or we get
+	 * annoying spurious interrupt messages.  This is because mucking
+	 * with spl() levels during polling does not prevent interrupts from
+	 * being generated.
+	 */
+
+#if 0
+	if (on)
+		swallow_zsintrs++;
+	else
+		swallow_zsintrs--;
+#endif
+}
+