[PATCH] ppc32: remove obsolete macserial driver

The macserial driver has been obsoleted by the new pmac_zilog driver for a
while now and probably doesn't even work anymore on recent kernels.  This
patch removes it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 0 insertions, 3505 deletions

diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig
index 8a7117a08cf..b0ace5bc950 100644
--- a/drivers/macintosh/Kconfig
+++ b/drivers/macintosh/Kconfig
@@ -126,13 +126,6 @@ config PMAC_BACKLIGHT
 	  events; also, the PowerBook button device will be enabled so you can
 	  change the screen brightness.
 
-config MAC_SERIAL
-	tristate "Support for PowerMac serial ports (OBSOLETE DRIVER)"
-	depends on PPC_PMAC && BROKEN
-	help
-	  This driver is obsolete. Use CONFIG_SERIAL_PMACZILOG in
-	  "Character devices --> Serial drivers --> PowerMac z85c30" option.
-
 config ADB_MACIO
 	bool "Include MacIO (CHRP) ADB driver"
 	depends on ADB && PPC_CHRP && !PPC_PMAC64
diff --git a/drivers/macintosh/Makefile b/drivers/macintosh/Makefile
index c3a4705a829..b3f88a4fcef 100644
--- a/drivers/macintosh/Makefile
+++ b/drivers/macintosh/Makefile
@@ -7,7 +7,6 @@
 obj-$(CONFIG_PPC_PMAC)		+= macio_asic.o
 
 obj-$(CONFIG_PMAC_PBOOK)	+= mediabay.o
-obj-$(CONFIG_MAC_SERIAL)	+= macserial.o
 obj-$(CONFIG_MAC_EMUMOUSEBTN)	+= mac_hid.o
 obj-$(CONFIG_INPUT_ADBHID)	+= adbhid.o
 obj-$(CONFIG_ANSLCD)		+= ans-lcd.o
diff --git a/drivers/macintosh/macserial.c b/drivers/macintosh/macserial.c
deleted file mode 100644
index 0be3ac6cc16..00000000000
--- a/drivers/macintosh/macserial.c
+++ /dev/null
@@ -1,3036 +0,0 @@
-/*
- * macserial.c: Serial port driver for Power Macintoshes.
- *
- * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
- *
- * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- *
- * Receive DMA code by Takashi Oe <toe@unlserve.unl.edu>.
- *
- * $Id: macserial.c,v 1.24.2.4 1999/10/19 04:36:42 paulus Exp $
- */
-
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/timer.h>
-#include <linux/interrupt.h>
-#include <linux/workqueue.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/major.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/mm.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#ifdef CONFIG_SERIAL_CONSOLE
-#include <linux/console.h>
-#endif
-#include <linux/slab.h>
-#include <linux/bitops.h>
-
-#include <asm/sections.h>
-#include <asm/io.h>
-#include <asm/pgtable.h>
-#include <asm/irq.h>
-#include <asm/prom.h>
-#include <asm/system.h>
-#include <asm/segment.h>
-#include <asm/machdep.h>
-#include <asm/pmac_feature.h>
-#include <linux/adb.h>
-#include <linux/pmu.h>
-#ifdef CONFIG_KGDB
-#include <asm/kgdb.h>
-#endif
-#include <asm/dbdma.h>
-
-#include "macserial.h"
-
-#ifdef CONFIG_PMAC_PBOOK
-static int serial_notify_sleep(struct pmu_sleep_notifier *self, int when);
-static struct pmu_sleep_notifier serial_sleep_notifier = {
-	serial_notify_sleep,
-	SLEEP_LEVEL_MISC,
-};
-#endif
-
-#define SUPPORT_SERIAL_DMA
-#define MACSERIAL_VERSION	"2.0"
-
-/*
- * It would be nice to dynamically allocate everything that
- * depends on NUM_SERIAL, so we could support any number of
- * Z8530s, but for now...
- */
-#define NUM_SERIAL	2		/* Max number of ZS chips supported */
-#define NUM_CHANNELS	(NUM_SERIAL * 2)	/* 2 channels per chip */
-
-/* On PowerMacs, the hardware takes care of the SCC recovery time,
-   but we need the eieio to make sure that the accesses occur
-   in the order we want. */
-#define RECOVERY_DELAY	eieio()
-
-static struct tty_driver *serial_driver;
-
-struct mac_zschannel zs_channels[NUM_CHANNELS];
-
-struct mac_serial zs_soft[NUM_CHANNELS];
-int zs_channels_found;
-struct mac_serial *zs_chain;	/* list of all channels */
-
-struct tty_struct zs_ttys[NUM_CHANNELS];
-
-static int is_powerbook;
-
-#ifdef CONFIG_SERIAL_CONSOLE
-static struct console sercons;
-#endif
-
-#ifdef CONFIG_KGDB
-struct mac_zschannel *zs_kgdbchan;
-static unsigned char scc_inittab[] = {
-	9,  0x80,	/* reset A side (CHRA) */
-	13, 0,		/* set baud rate divisor */
-	12, 1,
-	14, 1,		/* baud rate gen enable, src=rtxc (BRENABL) */
-	11, 0x50,	/* clocks = br gen (RCBR | TCBR) */
-	5,  0x6a,	/* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */
-	4,  0x44,	/* x16 clock, 1 stop (SB1 | X16CLK)*/
-	3,  0xc1,	/* rx enable, 8 bits (RxENABLE | Rx8)*/
-};
-#endif
-#define ZS_CLOCK         3686400 	/* Z8530 RTxC input clock rate */
-
-/* serial subtype definitions */
-#define SERIAL_TYPE_NORMAL	1
-
-/* number of characters left in xmit buffer before we ask for more */
-#define WAKEUP_CHARS 256
-
-/*
- * Debugging.
- */
-#undef SERIAL_DEBUG_INTR
-#undef SERIAL_DEBUG_OPEN
-#undef SERIAL_DEBUG_FLOW
-#undef SERIAL_DEBUG_POWER
-#undef SERIAL_DEBUG_THROTTLE
-#undef SERIAL_DEBUG_STOP
-#undef SERIAL_DEBUG_BAUDS
-
-#define RS_STROBE_TIME 10
-#define RS_ISR_PASS_LIMIT 256
-
-#define _INLINE_ inline
-
-#ifdef SERIAL_DEBUG_OPEN
-#define OPNDBG(fmt, arg...)	printk(KERN_DEBUG fmt , ## arg)
-#else
-#define OPNDBG(fmt, arg...)	do { } while (0)
-#endif
-#ifdef SERIAL_DEBUG_POWER
-#define PWRDBG(fmt, arg...)	printk(KERN_DEBUG fmt , ## arg)
-#else
-#define PWRDBG(fmt, arg...)	do { } while (0)
-#endif
-#ifdef SERIAL_DEBUG_BAUDS
-#define BAUDBG(fmt, arg...)	printk(fmt , ## arg)
-#else
-#define BAUDBG(fmt, arg...)	do { } while (0)
-#endif
-
-static void probe_sccs(void);
-static void change_speed(struct mac_serial *info, struct termios *old);
-static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
-static int set_scc_power(struct mac_serial * info, int state);
-static int setup_scc(struct mac_serial * info);
-static void dbdma_reset(volatile struct dbdma_regs *dma);
-static void dbdma_flush(volatile struct dbdma_regs *dma);
-static irqreturn_t rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs);
-static irqreturn_t rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs);
-static void dma_init(struct mac_serial * info);
-static void rxdma_start(struct mac_serial * info, int curr);
-static void rxdma_to_tty(struct mac_serial * info);
-
-/*
- * tmp_buf is used as a temporary buffer by serial_write.  We need to
- * lock it in case the copy_from_user blocks while swapping in a page,
- * and some other program tries to do a serial write at the same time.
- * Since the lock will only come under contention when the system is
- * swapping and available memory is low, it makes sense to share one
- * buffer across all the serial ports, since it significantly saves
- * memory if large numbers of serial ports are open.
- */
-static unsigned char *tmp_buf;
-static DECLARE_MUTEX(tmp_buf_sem);
-
-
-static inline int __pmac
-serial_paranoia_check(struct mac_serial *info,
-		      char *name, const char *routine)
-{
-#ifdef SERIAL_PARANOIA_CHECK
-	static const char badmagic[] = KERN_WARNING
-		"Warning: bad magic number for serial struct %s in %s\n";
-	static const char badinfo[] = KERN_WARNING
-		"Warning: null mac_serial for %s in %s\n";
-
-	if (!info) {
-		printk(badinfo, name, routine);
-		return 1;
-	}
-	if (info->magic != SERIAL_MAGIC) {
-		printk(badmagic, name, routine);
-		return 1;
-	}
-#endif
-	return 0;
-}
-
-/* 
- * Reading and writing Z8530 registers.
- */
-static inline unsigned char __pmac read_zsreg(struct mac_zschannel *channel,
-					      unsigned char reg)
-{
-	unsigned char retval;
-	unsigned long flags;
-
-	/*
-	 * We have to make this atomic.
-	 */
-	spin_lock_irqsave(&channel->lock, flags);
-	if (reg != 0) {
-		*channel->control = reg;
-		RECOVERY_DELAY;
-	}
-	retval = *channel->control;
-	RECOVERY_DELAY;
-	spin_unlock_irqrestore(&channel->lock, flags);
-	return retval;
-}
-
-static inline void __pmac write_zsreg(struct mac_zschannel *channel,
-				      unsigned char reg, unsigned char value)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&channel->lock, flags);
-	if (reg != 0) {
-		*channel->control = reg;
-		RECOVERY_DELAY;
-	}
-	*channel->control = value;
-	RECOVERY_DELAY;
-	spin_unlock_irqrestore(&channel->lock, flags);
-	return;
-}
-
-static inline unsigned char __pmac read_zsdata(struct mac_zschannel *channel)
-{
-	unsigned char retval;
-
-	retval = *channel->data;
-	RECOVERY_DELAY;
-	return retval;
-}
-
-static inline void write_zsdata(struct mac_zschannel *channel,
-				unsigned char value)
-{
-	*channel->data = value;
-	RECOVERY_DELAY;
-	return;
-}
-
-static inline void load_zsregs(struct mac_zschannel *channel,
-			       unsigned char *regs)
-{
-	ZS_CLEARERR(channel);
-	ZS_CLEARFIFO(channel);
-	/* Load 'em up */
-	write_zsreg(channel, R4, regs[R4]);
-	write_zsreg(channel, R10, regs[R10]);
-	write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
-	write_zsreg(channel, R5, regs[R5] & ~TxENAB);
-	write_zsreg(channel, R1, regs[R1]);
-	write_zsreg(channel, R9, regs[R9]);
-	write_zsreg(channel, R11, regs[R11]);
-	write_zsreg(channel, R12, regs[R12]);
-	write_zsreg(channel, R13, regs[R13]);
-	write_zsreg(channel, R14, regs[R14]);
-	write_zsreg(channel, R15, regs[R15]);
-	write_zsreg(channel, R3, regs[R3]);
-	write_zsreg(channel, R5, regs[R5]);
-	return;
-}
-
-/* Sets or clears DTR/RTS on the requested line */
-static inline void zs_rtsdtr(struct mac_serial *ss, int set)
-{
-	if (set)
-		ss->curregs[5] |= (RTS | DTR);
-	else
-		ss->curregs[5] &= ~(RTS | DTR);
-	write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
-	return;
-}
-
-/* Utility routines for the Zilog */
-static inline int get_zsbaud(struct mac_serial *ss)
-{
-	struct mac_zschannel *channel = ss->zs_channel;
-	int brg;
-
-	if ((ss->curregs[R11] & TCBR) == 0) {
-		/* higher rates don't use the baud rate generator */
-		return (ss->curregs[R4] & X32CLK)? ZS_CLOCK/32: ZS_CLOCK/16;
-	}
-	/* The baud rate is split up between two 8-bit registers in
-	 * what is termed 'BRG time constant' format in my docs for
-	 * the chip, it is a function of the clk rate the chip is
-	 * receiving which happens to be constant.
-	 */
-	brg = (read_zsreg(channel, 13) << 8);
-	brg |= read_zsreg(channel, 12);
-	return BRG_TO_BPS(brg, (ZS_CLOCK/(ss->clk_divisor)));
-}
-
-/* On receive, this clears errors and the receiver interrupts */
-static inline void rs_recv_clear(struct mac_zschannel *zsc)
-{
-	write_zsreg(zsc, 0, ERR_RES);
-	write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */
-}
-
-/*
- * Reset a Descriptor-Based DMA channel.
- */
-static void dbdma_reset(volatile struct dbdma_regs *dma)
-{
-	int i;
-
-	out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16);
-
-	/*
-	 * Yes this looks peculiar, but apparently it needs to be this
-	 * way on some machines.  (We need to make sure the DBDMA
-	 * engine has actually got the write above and responded
-	 * to it. - paulus)
-	 */
-	for (i = 200; i > 0; --i)
-		if (ld_le32(&dma->status) & RUN)
-			udelay(1);
-}
-
-/*
- * Tells a DBDMA channel to stop and write any buffered data
- * it might have to memory.
- */
-static _INLINE_ void dbdma_flush(volatile struct dbdma_regs *dma)
-{
-	int i = 0;
-
-	out_le32(&dma->control, (FLUSH << 16) | FLUSH);
-	while (((in_le32(&dma->status) & FLUSH) != 0) && (i++ < 100))
-		udelay(1);
-}
-
-/*
- * ----------------------------------------------------------------------
- *
- * Here starts the interrupt handling routines.  All of the following
- * subroutines are declared as inline and are folded into
- * rs_interrupt().  They were separated out for readability's sake.
- *
- * 				- Ted Ts'o (tytso@mit.edu), 7-Mar-93
- * -----------------------------------------------------------------------
- */
-
-/*
- * This routine is used by the interrupt handler to schedule
- * processing in the software interrupt portion of the driver.
- */
-static _INLINE_ void rs_sched_event(struct mac_serial *info,
-				  int event)
-{
-	info->event |= 1 << event;
-	schedule_work(&info->tqueue);
-}
-
-/* Work out the flag value for a z8530 status value. */
-static _INLINE_ int stat_to_flag(int stat)
-{
-	int flag;
-
-	if (stat & Rx_OVR) {
-		flag = TTY_OVERRUN;
-	} else if (stat & FRM_ERR) {
-		flag = TTY_FRAME;
-	} else if (stat & PAR_ERR) {
-		flag = TTY_PARITY;
-	} else
-		flag = 0;
-	return flag;
-}
-
-static _INLINE_ void receive_chars(struct mac_serial *info,
-				   struct pt_regs *regs)
-{
-	struct tty_struct *tty = info->tty;
-	unsigned char ch, stat, flag;
-
-	while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) != 0) {
-
-		stat = read_zsreg(info->zs_channel, R1);
-		ch = read_zsdata(info->zs_channel);
-
-#ifdef CONFIG_KGDB
-		if (info->kgdb_channel) {
-			if (ch == 0x03 || ch == '$')
-				breakpoint();
-			if (stat & (Rx_OVR|FRM_ERR|PAR_ERR))
-				write_zsreg(info->zs_channel, 0, ERR_RES);
-			return;
-		}
-#endif
-		if (!tty)
-			continue;
-		if (tty->flip.count >= TTY_FLIPBUF_SIZE)
-			tty_flip_buffer_push(tty);
-
-		if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
-			static int flip_buf_ovf;
-			if (++flip_buf_ovf <= 1)
-				printk(KERN_WARNING "FB. overflow: %d\n",
-						    flip_buf_ovf);
-			break;
-		}
-		tty->flip.count++;
-		{
-			static int flip_max_cnt;
-			if (flip_max_cnt < tty->flip.count)
-				flip_max_cnt = tty->flip.count;
-		}
-		flag = stat_to_flag(stat);
-		if (flag)
-			/* reset the error indication */
-			write_zsreg(info->zs_channel, 0, ERR_RES);
-		*tty->flip.flag_buf_ptr++ = flag;
-		*tty->flip.char_buf_ptr++ = ch;
-	}
-	if (tty)
-		tty_flip_buffer_push(tty);
-}
-
-static void transmit_chars(struct mac_serial *info)
-{
-	if ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0)
-		return;
-	info->tx_active = 0;
-
-	if (info->x_char && !info->power_wait) {
-		/* Send next char */
-		write_zsdata(info->zs_channel, info->x_char);
-		info->x_char = 0;
-		info->tx_active = 1;
-		return;
-	}
-
-	if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tx_stopped
-	    || info->power_wait) {
-		write_zsreg(info->zs_channel, 0, RES_Tx_P);
-		return;
-	}
-
-	/* Send char */
-	write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
-	info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
-	info->xmit_cnt--;
-	info->tx_active = 1;
-
-	if (info->xmit_cnt < WAKEUP_CHARS)
-		rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
-}
-
-static void powerup_done(unsigned long data)
-{
-	struct mac_serial *info = (struct mac_serial *) data;
-	unsigned long flags;
-
-	spin_lock_irqsave(&info->lock, flags);
-	info->power_wait = 0;
-	transmit_chars(info);
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static _INLINE_ void status_handle(struct mac_serial *info)
-{
-	unsigned char status;
-
-	/* Get status from Read Register 0 */
-	status = read_zsreg(info->zs_channel, 0);
-
-	/* Check for DCD transitions */
-	if (((status ^ info->read_reg_zero) & DCD) != 0
-	    && info->tty && !C_CLOCAL(info->tty)) {
-		if (status & DCD) {
-			wake_up_interruptible(&info->open_wait);
-		} else {
-			if (info->tty)
-				tty_hangup(info->tty);
-		}
-	}
-
-	/* Check for CTS transitions */
-	if (info->tty && C_CRTSCTS(info->tty)) {
-		/*
-		 * For some reason, on the Power Macintosh,
-		 * it seems that the CTS bit is 1 when CTS is
-		 * *negated* and 0 when it is asserted.
-		 * The DCD bit doesn't seem to be inverted
-		 * like this.
-		 */
-		if ((status & CTS) == 0) {
-			if (info->tx_stopped) {
-#ifdef SERIAL_DEBUG_FLOW
-				printk(KERN_DEBUG "CTS up\n");
-#endif
-				info->tx_stopped = 0;
-				if (!info->tx_active)
-					transmit_chars(info);
-			}
-		} else {
-#ifdef SERIAL_DEBUG_FLOW
-			printk(KERN_DEBUG "CTS down\n");
-#endif
-			info->tx_stopped = 1;
-		}
-	}
-
-	/* Clear status condition... */
-	write_zsreg(info->zs_channel, 0, RES_EXT_INT);
-	info->read_reg_zero = status;
-}
-
-static _INLINE_ void receive_special_dma(struct mac_serial *info)
-{
-	unsigned char stat, flag;
-	volatile struct dbdma_regs *rd = &info->rx->dma;
-	int where = RX_BUF_SIZE;
-
-	spin_lock(&info->rx_dma_lock);
-	if ((ld_le32(&rd->status) & ACTIVE) != 0)
-		dbdma_flush(rd);
-	if (in_le32(&rd->cmdptr)
-	    == virt_to_bus(info->rx_cmds[info->rx_cbuf] + 1))
-		where -= in_le16(&info->rx->res_count);
-	where--;
-
-	stat = read_zsreg(info->zs_channel, R1);
-
-	flag = stat_to_flag(stat);
-	if (flag) {
-		info->rx_flag_buf[info->rx_cbuf][where] = flag;
-		/* reset the error indication */
-		write_zsreg(info->zs_channel, 0, ERR_RES);
-	}
-
-	spin_unlock(&info->rx_dma_lock);
-}
-
-/*
- * This is the serial driver's generic interrupt routine
- */
-static irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
-{
-	struct mac_serial *info = (struct mac_serial *) dev_id;
-	unsigned char zs_intreg;
-	int shift;
-	unsigned long flags;
-	int handled = 0;
-
-	if (!(info->flags & ZILOG_INITIALIZED)) {
-		printk(KERN_WARNING "rs_interrupt: irq %d, port not "
-				    "initialized\n", irq);
-		disable_irq(irq);
-		return IRQ_NONE;
-	}
-
-	/* NOTE: The read register 3, which holds the irq status,
-	 *       does so for both channels on each chip.  Although
-	 *       the status value itself must be read from the A
-	 *       channel and is only valid when read from channel A.
-	 *       Yes... broken hardware...
-	 */
-#define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
-
-	if (info->zs_chan_a == info->zs_channel)
-		shift = 3;	/* Channel A */
-	else
-		shift = 0;	/* Channel B */
-
-	spin_lock_irqsave(&info->lock, flags);
-	for (;;) {
-		zs_intreg = read_zsreg(info->zs_chan_a, 3) >> shift;
-#ifdef SERIAL_DEBUG_INTR
-		printk(KERN_DEBUG "rs_interrupt: irq %d, zs_intreg 0x%x\n",
-		       irq, (int)zs_intreg);
-#endif
-
-		if ((zs_intreg & CHAN_IRQMASK) == 0)
-			break;
-		handled = 1;
-
-		if (zs_intreg & CHBRxIP) {
-			/* If we are doing DMA, we only ask for interrupts
-			   on characters with errors or special conditions. */
-			if (info->dma_initted)
-				receive_special_dma(info);
-			else
-				receive_chars(info, regs);
-		}
-		if (zs_intreg & CHBTxIP)
-			transmit_chars(info);
-		if (zs_intreg & CHBEXT)
-			status_handle(info);
-	}
-	spin_unlock_irqrestore(&info->lock, flags);
-	return IRQ_RETVAL(handled);
-}
-
-/* Transmit DMA interrupt - not used at present */
-static irqreturn_t rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
-	return IRQ_HANDLED;
-}
-
-/*
- * Receive DMA interrupt.
- */
-static irqreturn_t rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
-	struct mac_serial *info = (struct mac_serial *) dev_id;
-	volatile struct dbdma_cmd *cd;
-
-	if (!info->dma_initted)
-		return IRQ_NONE;
-	spin_lock(&info->rx_dma_lock);
-	/* First, confirm that this interrupt is, indeed, coming */
-	/* from Rx DMA */
-	cd = info->rx_cmds[info->rx_cbuf] + 2;
-	if ((in_le16(&cd->xfer_status) & (RUN | ACTIVE)) != (RUN | ACTIVE)) {
-		spin_unlock(&info->rx_dma_lock);
-		return IRQ_NONE;
-	}
-	if (info->rx_fbuf != RX_NO_FBUF) {
-		info->rx_cbuf = info->rx_fbuf;
-		if (++info->rx_fbuf == info->rx_nbuf)
-			info->rx_fbuf = 0;
-		if (info->rx_fbuf == info->rx_ubuf)
-			info->rx_fbuf = RX_NO_FBUF;
-	}
-	spin_unlock(&info->rx_dma_lock);
-	return IRQ_HANDLED;
-}
-
-/*
- * -------------------------------------------------------------------
- * Here ends the serial interrupt routines.
- * -------------------------------------------------------------------
- */
-
-/*
- * ------------------------------------------------------------
- * rs_stop() and rs_start()
- *
- * This routines are called before setting or resetting tty->stopped.
- * ------------------------------------------------------------
- */
-static void rs_stop(struct tty_struct *tty)
-{
-	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
-
-#ifdef SERIAL_DEBUG_STOP
-	printk(KERN_DEBUG "rs_stop %ld....\n",
-	       tty->ldisc.chars_in_buffer(tty));
-#endif
-
-	if (serial_paranoia_check(info, tty->name, "rs_stop"))
-		return;
-
-#if 0
-	spin_lock_irqsave(&info->lock, flags);
-	if (info->curregs[5] & TxENAB) {
-		info->curregs[5] &= ~TxENAB;
-		info->pendregs[5] &= ~TxENAB;
-		write_zsreg(info->zs_channel, 5, info->curregs[5]);
-	}
-	spin_unlock_irqrestore(&info->lock, flags);
-#endif
-}
-
-static void rs_start(struct tty_struct *tty)
-{
-	struct mac_serial *info = (struct mac_serial *)tty->driver_data;
-	unsigned long flags;
-
-#ifdef SERIAL_DEBUG_STOP
-	printk(KERN_DEBUG "rs_start %ld....\n", 
-	       tty->ldisc.chars_in_buffer(tty));
-#endif
-
-	if (serial_paranoia_check(info, tty->name, "rs_start"))
-		return;
-
-	spin_lock_irqsave(&info->lock, flags);
-#if 0
-	if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) {
-		info->curregs[5] |= TxENAB;
-		info->pendregs[5] = info->curregs[5];
-		write_zsreg(info->zs_channel, 5, info->curregs[5]);
-	}
-#else
-	if (info->xmit_cnt && info->xmit_buf && !info->tx_active) {
-		transmit_chars(info);
-	}
-#endif
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void do_softint(void *private_)
-{
-	struct mac_serial	*info = (struct mac_serial *) private_;
-	struct tty_struct	*tty;
-
-	tty = info->tty;
-	if (!tty)
-		return;
-
-	if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
-		tty_wakeup(tty);
-}
-
-static int startup(struct mac_serial * info)
-{
-	int delay;
-
-	OPNDBG("startup() (ttyS%d, irq %d)\n", info->line, info->irq);
- 
-	if (info->flags & ZILOG_INITIALIZED) {
-		OPNDBG(" -> already inited\n");
- 		return 0;
-	}
-
-	if (!info->xmit_buf) {
-		info->xmit_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
-		if (!info->xmit_buf)
-			return -ENOMEM;
-	}
-
-	OPNDBG("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
-
-	delay = set_scc_power(info, 1);
-
-	setup_scc(info);
-
-	if (delay) {
-		unsigned long flags;
-
-		/* delay is in ms */
-		spin_lock_irqsave(&info->lock, flags);
-		info->power_wait = 1;
-		mod_timer(&info->powerup_timer,
-			  jiffies + (delay * HZ + 999) / 1000);
-		spin_unlock_irqrestore(&info->lock, flags);
-	}
-
-	OPNDBG("enabling IRQ on ttyS%d (irq %d)...\n", info->line, info->irq);
-
-	info->flags |= ZILOG_INITIALIZED;
-	enable_irq(info->irq);
-	if (info->dma_initted) {
-		enable_irq(info->rx_dma_irq);
-	}
-
-	return 0;
-}
-
-static _INLINE_ void rxdma_start(struct mac_serial * info, int curr)
-{
-	volatile struct dbdma_regs *rd = &info->rx->dma;
-	volatile struct dbdma_cmd *cd = info->rx_cmds[curr];
-
-//printk(KERN_DEBUG "SCC: rxdma_start\n");
-
-	st_le32(&rd->cmdptr, virt_to_bus(cd));
-	out_le32(&rd->control, (RUN << 16) | RUN);
-}
-
-static void rxdma_to_tty(struct mac_serial *info)
-{
-	struct tty_struct	*tty = info->tty;
-	volatile struct dbdma_regs *rd = &info->rx->dma;
-	unsigned long flags;
-	int residue, available, space, do_queue;
-
-	if (!tty)
-		return;
-
-	do_queue = 0;
-	spin_lock_irqsave(&info->rx_dma_lock, flags);
-more:
-	space = TTY_FLIPBUF_SIZE - tty->flip.count;
-	if (!space) {
-		do_queue++;
-		goto out;
-	}
-	residue = 0;
-	if (info->rx_ubuf == info->rx_cbuf) {
-		if ((ld_le32(&rd->status) & ACTIVE) != 0) {
-			dbdma_flush(rd);
-			if (in_le32(&rd->cmdptr)
-			    == virt_to_bus(info->rx_cmds[info->rx_cbuf]+1))
-				residue = in_le16(&info->rx->res_count);
-		}
-	}
-	available = RX_BUF_SIZE - residue - info->rx_done_bytes;
-	if (available > space)
-		available = space;
-	if (available) {
-		memcpy(tty->flip.char_buf_ptr,
-		       info->rx_char_buf[info->rx_ubuf] + info->rx_done_bytes,
-		       available);
-		memcpy(tty->flip.flag_buf_ptr,
-		       info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes,
-		       available);
-		tty->flip.char_buf_ptr += available;
-		tty->flip.count += available;
-		tty->flip.flag_buf_ptr += available;
-		memset(info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes,
-		       0, available);
-		info->rx_done_bytes += available;
-		do_queue++;
-	}
-	if (info->rx_done_bytes == RX_BUF_SIZE) {
-		volatile struct dbdma_cmd *cd = info->rx_cmds[info->rx_ubuf];
-
-		if (info->rx_ubuf == info->rx_cbuf)
-			goto out;
-		/* mark rx_char_buf[rx_ubuf] free */
-		st_le16(&cd->command, DBDMA_NOP);
-		cd++;
-		st_le32(&cd->cmd_dep, 0);
-		st_le32((unsigned int *)&cd->res_count, 0);
-		cd++;
-		st_le16(&cd->xfer_status, 0);
-
-		if (info->rx_fbuf == RX_NO_FBUF) {
-			info->rx_fbuf = info->rx_ubuf;
-			if (!(ld_le32(&rd->status) & ACTIVE)) {
-				dbdma_reset(&info->rx->dma);
-				rxdma_start(info, info->rx_ubuf);
-				info->rx_cbuf = info->rx_ubuf;
-			}
-		}
-		info->rx_done_bytes = 0;
-		if (++info->rx_ubuf == info->rx_nbuf)
-			info->rx_ubuf = 0;
-		if (info->rx_fbuf == info->rx_ubuf)
-			info->rx_fbuf = RX_NO_FBUF;
-		goto more;
-	}
-out:
-	spin_unlock_irqrestore(&info->rx_dma_lock, flags);
-	if (do_queue)
-		tty_flip_buffer_push(tty);
-}
-
-static void poll_rxdma(unsigned long private_)
-{
-	struct mac_serial	*info = (struct mac_serial *) private_;
-	unsigned long flags;
-
-	rxdma_to_tty(info);
-	spin_lock_irqsave(&info->rx_dma_lock, flags);
-	mod_timer(&info->poll_dma_timer, RX_DMA_TIMER);
-	spin_unlock_irqrestore(&info->rx_dma_lock, flags);
-}
-
-static void dma_init(struct mac_serial * info)
-{
-	int i, size;
-	volatile struct dbdma_cmd *cd;
-	unsigned char *p;
-
-	info->rx_nbuf = 8;
-
-	/* various mem set up */
-	size = sizeof(struct dbdma_cmd) * (3 * info->rx_nbuf + 2)
-		+ (RX_BUF_SIZE * 2 + sizeof(*info->rx_cmds)
-		   + sizeof(*info->rx_char_buf) + sizeof(*info->rx_flag_buf))
-		* info->rx_nbuf;
-	info->dma_priv = kmalloc(size, GFP_KERNEL | GFP_DMA);
-	if (info->dma_priv == NULL)
-		return;
-	memset(info->dma_priv, 0, size);
-
-	info->rx_cmds = (volatile struct dbdma_cmd **)info->dma_priv;
-	info->rx_char_buf = (unsigned char **) (info->rx_cmds + info->rx_nbuf);
-	info->rx_flag_buf = info->rx_char_buf + info->rx_nbuf;
-	p = (unsigned char *) (info->rx_flag_buf + info->rx_nbuf);
-	for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE)
-		info->rx_char_buf[i] = p;
-	for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE)
-		info->rx_flag_buf[i] = p;
-
-	/* a bit of DMA programming */
-	cd = info->rx_cmds[0] = (volatile struct dbdma_cmd *) DBDMA_ALIGN(p);
-	st_le16(&cd->command, DBDMA_NOP);
-	cd++;
-	st_le16(&cd->req_count, RX_BUF_SIZE);
-	st_le16(&cd->command, INPUT_MORE);
-	st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[0]));
-	cd++;
-	st_le16(&cd->req_count, 4);
-	st_le16(&cd->command, STORE_WORD | INTR_ALWAYS);
-	st_le32(&cd->phy_addr, virt_to_bus(cd-2));
-	st_le32(&cd->cmd_dep, DBDMA_STOP);
-	for (i = 1; i < info->rx_nbuf; i++) {
-		info->rx_cmds[i] = ++cd;
-		st_le16(&cd->command, DBDMA_NOP);
-		cd++;
-		st_le16(&cd->req_count, RX_BUF_SIZE);
-		st_le16(&cd->command, INPUT_MORE);
-		st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[i]));
-		cd++;
-		st_le16(&cd->req_count, 4);
-		st_le16(&cd->command, STORE_WORD | INTR_ALWAYS);
-		st_le32(&cd->phy_addr, virt_to_bus(cd-2));
-		st_le32(&cd->cmd_dep, DBDMA_STOP);
-	}
-	cd++;
-	st_le16(&cd->command, DBDMA_NOP | BR_ALWAYS);
-	st_le32(&cd->cmd_dep, virt_to_bus(info->rx_cmds[0]));
-
-	/* setup DMA to our liking */
-	dbdma_reset(&info->rx->dma);
-	st_le32(&info->rx->dma.intr_sel, 0x10001);
-	st_le32(&info->rx->dma.br_sel, 0x10001);
-	out_le32(&info->rx->dma.wait_sel, 0x10001);
-
-	/* set various flags */
-	info->rx_ubuf = 0;
-	info->rx_cbuf = 0;
-	info->rx_fbuf = info->rx_ubuf + 1;
-	if (info->rx_fbuf == info->rx_nbuf)
-		info->rx_fbuf = RX_NO_FBUF;
-	info->rx_done_bytes = 0;
-
-	/* setup polling */
-	init_timer(&info->poll_dma_timer);
-	info->poll_dma_timer.function = (void *)&poll_rxdma;
-	info->poll_dma_timer.data = (unsigned long)info;
-
-	info->dma_initted = 1;
-}
-
-/*
- * FixZeroBug....Works around a bug in the SCC receving channel.
- * Taken from Darwin code, 15 Sept. 2000  -DanM
- *
- * The following sequence prevents a problem that is seen with O'Hare ASICs
- * (most versions -- also with some Heathrow and Hydra ASICs) where a zero
- * at the input to the receiver becomes 'stuck' and locks up the receiver.
- * This problem can occur as a result of a zero bit at the receiver input
- * coincident with any of the following events:
- *
- *	The SCC is initialized (hardware or software).
- *	A framing error is detected.
- *	The clocking option changes from synchronous or X1 asynchronous
- *		clocking to X16, X32, or X64 asynchronous clocking.
- *	The decoding mode is changed among NRZ, NRZI, FM0, or FM1.
- *
- * This workaround attempts to recover from the lockup condition by placing
- * the SCC in synchronous loopback mode with a fast clock before programming
- * any of the asynchronous modes.
- */
-static void fix_zero_bug_scc(struct mac_serial * info)
-{
-	write_zsreg(info->zs_channel, 9,
-		    (info->zs_channel == info->zs_chan_a? CHRA: CHRB));
-	udelay(10);
-	write_zsreg(info->zs_channel, 9,
-		    ((info->zs_channel == info->zs_chan_a? CHRA: CHRB) | NV));
-
-	write_zsreg(info->zs_channel, 4, (X1CLK | EXTSYNC));
-
-	/* I think this is wrong....but, I just copying code....
-	*/
-	write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE));
-
-	write_zsreg(info->zs_channel, 5, (8 & ~TxENAB));
-	write_zsreg(info->zs_channel, 9, NV);	/* Didn't we already do this? */
-	write_zsreg(info->zs_channel, 11, (RCBR | TCBR));
-	write_zsreg(info->zs_channel, 12, 0);
-	write_zsreg(info->zs_channel, 13, 0);
-	write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR));
-	write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR | BRENABL));
-	write_zsreg(info->zs_channel, 3, (8 | RxENABLE));
-	write_zsreg(info->zs_channel, 0, RES_EXT_INT);
-	write_zsreg(info->zs_channel, 0, RES_EXT_INT);	/* to kill some time */
-
-	/* The channel should be OK now, but it is probably receiving
-	 * loopback garbage.
-	 * Switch to asynchronous mode, disable the receiver,
-	 * and discard everything in the receive buffer.
-	 */
-	write_zsreg(info->zs_channel, 9, NV);
-	write_zsreg(info->zs_channel, 4, PAR_ENA);
-	write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE));
-
-	while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV) {
-		(void)read_zsreg(info->zs_channel, 8);
-		write_zsreg(info->zs_channel, 0, RES_EXT_INT);
-		write_zsreg(info->zs_channel, 0, ERR_RES);
-	}
-}
-
-static int setup_scc(struct mac_serial * info)
-{
-	unsigned long flags;
-
-	OPNDBG("setting up ttyS%d SCC...\n", info->line);
-
-	spin_lock_irqsave(&info->lock, flags);
-
-	/* Nice buggy HW ... */
-	fix_zero_bug_scc(info);
-
-	/*
-	 * Reset the chip.
-	 */
-	write_zsreg(info->zs_channel, 9,
-		    (info->zs_channel == info->zs_chan_a? CHRA: CHRB));
-	udelay(10);
-	write_zsreg(info->zs_channel, 9, 0);
-
-	/*
-	 * Clear the receive FIFO.
-	 */
-	ZS_CLEARFIFO(info->zs_channel);
-	info->xmit_fifo_size = 1;
-
-	/*
-	 * Reset DMAs
-	 */
-	if (info->has_dma)
-		dma_init(info);
-
-	/*
-	 * Clear the interrupt registers.
-	 */
-	write_zsreg(info->zs_channel, 0, ERR_RES);
-	write_zsreg(info->zs_channel, 0, RES_H_IUS);
-
-	/*
-	 * Turn on RTS and DTR.
-	 */
-	if (!info->is_irda)
-		zs_rtsdtr(info, 1);
-
-	/*
-	 * Finally, enable sequencing and interrupts
-	 */
-	if (!info->dma_initted) {
-		/* interrupt on ext/status changes, all received chars,
-		   transmit ready */
-		info->curregs[1] = (info->curregs[1] & ~0x18)
-				| (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB);
-	} else {
-		/* interrupt on ext/status changes, W/Req pin is
-		   receive DMA request */
-		info->curregs[1] = (info->curregs[1] & ~(0x18 | TxINT_ENAB))
-				| (EXT_INT_ENAB | WT_RDY_RT | WT_FN_RDYFN);
-		write_zsreg(info->zs_channel, 1, info->curregs[1]);
-		/* enable W/Req pin */
-		info->curregs[1] |= WT_RDY_ENAB;