powerpc/iseries: remove the old viocons driver

This driver was declared obsolete over 2 years ago, the alternative
console driver for legacy iSeries (hvc_iseries) was made the default
over 1 year ago and this driver has been build broken for over 3
months, so remove it.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 2 insertions, 1179 deletions

diff --git a/arch/powerpc/platforms/iseries/Kconfig b/arch/powerpc/platforms/iseries/Kconfig
index ea3e541ac74..45ffd8e542f 100644
--- a/arch/powerpc/platforms/iseries/Kconfig
+++ b/arch/powerpc/platforms/iseries/Kconfig
@@ -7,15 +7,6 @@ config PPC_ISERIES
 menu "iSeries device drivers"
 	depends on PPC_ISERIES
 
-config VIOCONS
-	bool "iSeries Virtual Console Support (Obsolete)"
-	depends on !HVC_ISERIES
-	default n
-	help
-	  This is the old virtual console driver for legacy iSeries.
-	  You should use the iSeries Hypervisor Virtual Console
-	  support instead.
-
 config VIODASD
 	tristate "iSeries Virtual I/O disk support"
 	help
@@ -38,5 +29,5 @@ endmenu
 
 config VIOPATH
 	bool
-	depends on VIOCONS || VIODASD || VIOCD || VIOTAPE || ISERIES_VETH
+	depends on VIODASD || VIOCD || VIOTAPE || ISERIES_VETH
 	default y
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index d0ac944e169..caff85149b9 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -8,7 +8,7 @@ config VT
 	bool "Virtual terminal" if EMBEDDED
 	depends on !S390
 	select INPUT
-	default y if !VIOCONS
+	default y
 	---help---
 	  If you say Y here, you will get support for terminal devices with
 	  display and keyboard devices. These are called "virtual" because you
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 8a161c30e1d..6850f6da757 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -55,7 +55,6 @@ obj-$(CONFIG_RAW_DRIVER)	+= raw.o
 obj-$(CONFIG_SGI_SNSC)		+= snsc.o snsc_event.o
 obj-$(CONFIG_MSPEC)		+= mspec.o
 obj-$(CONFIG_MMTIMER)		+= mmtimer.o
-obj-$(CONFIG_VIOCONS)		+= viocons.o
 obj-$(CONFIG_VIOTAPE)		+= viotape.o
 obj-$(CONFIG_HVCS)		+= hvcs.o
 obj-$(CONFIG_IBM_BSR)		+= bsr.o
diff --git a/drivers/char/viocons.c b/drivers/char/viocons.c
deleted file mode 100644
index 7feeb774a10..00000000000
--- a/drivers/char/viocons.c
+++ /dev/null
@@ -1,1167 +0,0 @@
-/* -*- linux-c -*-
- *
- *  drivers/char/viocons.c
- *
- *  iSeries Virtual Terminal
- *
- *  Authors: Dave Boutcher <boutcher@us.ibm.com>
- *           Ryan Arnold <ryanarn@us.ibm.com>
- *           Colin Devilbiss <devilbis@us.ibm.com>
- *           Stephen Rothwell
- *
- * (C) Copyright 2000, 2001, 2002, 2003, 2004 IBM Corporation
- *
- * This program is free software;  you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) anyu later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include <linux/kernel.h>
-#include <linux/proc_fs.h>
-#include <linux/errno.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-#include <linux/console.h>
-#include <linux/module.h>
-#include <asm/uaccess.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <linux/spinlock.h>
-#include <asm/ioctls.h>
-#include <linux/kd.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/sysrq.h>
-
-#include <asm/firmware.h>
-#include <asm/iseries/vio.h>
-#include <asm/iseries/hv_lp_event.h>
-#include <asm/iseries/hv_call_event.h>
-#include <asm/iseries/hv_lp_config.h>
-#include <asm/iseries/hv_call.h>
-
-#ifdef CONFIG_VT
-#error You must turn off CONFIG_VT to use CONFIG_VIOCONS
-#endif
-
-#define VIOTTY_MAGIC (0x0DCB)
-#define VTTY_PORTS 10
-
-#define VIOCONS_KERN_WARN	KERN_WARNING "viocons: "
-#define VIOCONS_KERN_INFO	KERN_INFO "viocons: "
-
-static DEFINE_SPINLOCK(consolelock);
-static DEFINE_SPINLOCK(consoleloglock);
-
-static int vio_sysrq_pressed;
-
-#define VIOCHAR_NUM_BUF		16
-
-/*
- * Our port information.  We store a pointer to one entry in the
- * tty_driver_data
- */
-static struct port_info {
-	int magic;
-	struct tty_struct *tty;
-	HvLpIndex lp;
-	u8 vcons;
-	u64 seq;	/* sequence number of last HV send */
-	u64 ack;	/* last ack from HV */
-/*
- * When we get writes faster than we can send it to the partition,
- * buffer the data here. Note that used is a bit map of used buffers.
- * It had better have enough bits to hold VIOCHAR_NUM_BUF the bitops assume
- * it is a multiple of unsigned long
- */
-	unsigned long used;
-	u8 *buffer[VIOCHAR_NUM_BUF];
-	int bufferBytes[VIOCHAR_NUM_BUF];
-	int curbuf;
-	int bufferOverflow;
-	int overflowMessage;
-} port_info[VTTY_PORTS];
-
-#define viochar_is_console(pi)	((pi) == &port_info[0])
-#define viochar_port(pi)	((pi) - &port_info[0])
-
-static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp);
-
-static struct tty_driver *viotty_driver;
-
-static void hvlog(char *fmt, ...)
-{
-	int i;
-	unsigned long flags;
-	va_list args;
-	static char buf[256];
-
-	spin_lock_irqsave(&consoleloglock, flags);
-	va_start(args, fmt);
-	i = vscnprintf(buf, sizeof(buf) - 1, fmt, args);
-	va_end(args);
-	buf[i++] = '\r';
-	HvCall_writeLogBuffer(buf, i);
-	spin_unlock_irqrestore(&consoleloglock, flags);
-}
-
-static void hvlogOutput(const char *buf, int count)
-{
-	unsigned long flags;
-	int begin;
-	int index;
-	static const char cr = '\r';
-
-	begin = 0;
-	spin_lock_irqsave(&consoleloglock, flags);
-	for (index = 0; index < count; index++) {
-		if (buf[index] == '\n') {
-			/*
-			 * Start right after the last '\n' or at the zeroth
-			 * array position and output the number of characters
-			 * including the newline.
-			 */
-			HvCall_writeLogBuffer(&buf[begin], index - begin + 1);
-			begin = index + 1;
-			HvCall_writeLogBuffer(&cr, 1);
-		}
-	}
-	if ((index - begin) > 0)
-		HvCall_writeLogBuffer(&buf[begin], index - begin);
-	spin_unlock_irqrestore(&consoleloglock, flags);
-}
-
-/*
- * Make sure we're pointing to a valid port_info structure.  Shamelessly
- * plagerized from serial.c
- */
-static inline int viotty_paranoia_check(struct port_info *pi,
-					char *name, const char *routine)
-{
-	static const char *bad_pi_addr = VIOCONS_KERN_WARN
-		"warning: bad address for port_info struct (%s) in %s\n";
-	static const char *badmagic = VIOCONS_KERN_WARN
-		"warning: bad magic number for port_info struct (%s) in %s\n";
-
-	if ((pi < &port_info[0]) || (viochar_port(pi) > VTTY_PORTS)) {
-		printk(bad_pi_addr, name, routine);
-		return 1;
-	}
-	if (pi->magic != VIOTTY_MAGIC) {
-		printk(badmagic, name, routine);
-		return 1;
-	}
-	return 0;
-}
-
-/*
- * Add data to our pending-send buffers.  
- *
- * NOTE: Don't use printk in here because it gets nastily recursive.
- * hvlog can be used to log to the hypervisor buffer
- */
-static int buffer_add(struct port_info *pi, const char *buf, size_t len)
-{
-	size_t bleft;
-	size_t curlen;
-	const char *curbuf;
-	int nextbuf;
-
-	curbuf = buf;
-	bleft = len;
-	while (bleft > 0) {
-		/*
-		 * If there is no space left in the current buffer, we have
-		 * filled everything up, so return.  If we filled the previous
-		 * buffer we would already have moved to the next one.
-		 */
-		if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) {
-			hvlog ("\n\rviocons: No overflow buffer available for memcpy().\n");
-			pi->bufferOverflow++;
-			pi->overflowMessage = 1;
-			break;
-		}
-
-		/*
-		 * Turn on the "used" bit for this buffer.  If it's already on,
-		 * that's fine.
-		 */
-		set_bit(pi->curbuf, &pi->used);
-
-		/*
-		 * See if this buffer has been allocated.  If not, allocate it.
-		 */
-		if (pi->buffer[pi->curbuf] == NULL) {
-			pi->buffer[pi->curbuf] =
-			    kmalloc(VIOCHAR_MAX_DATA, GFP_ATOMIC);
-			if (pi->buffer[pi->curbuf] == NULL) {
-				hvlog("\n\rviocons: kmalloc failed allocating spaces for buffer %d.",
-					pi->curbuf);
-				break;
-			}
-		}
-
-		/* Figure out how much we can copy into this buffer. */
-		if (bleft < (VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf]))
-			curlen = bleft;
-		else
-			curlen = VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf];
-
-		/* Copy the data into the buffer. */
-		memcpy(pi->buffer[pi->curbuf] + pi->bufferBytes[pi->curbuf],
-				curbuf, curlen);
-
-		pi->bufferBytes[pi->curbuf] += curlen;
-		curbuf += curlen;
-		bleft -= curlen;
-
-		/*
-		 * Now see if we've filled this buffer.  If not then
-		 * we'll try to use it again later.  If we've filled it
-		 * up then we'll advance the curbuf to the next in the
-		 * circular queue.
-		 */
-		if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) {
-			nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF;
-			/*
-			 * Move to the next buffer if it hasn't been used yet
-			 */
-			if (test_bit(nextbuf, &pi->used) == 0)
-				pi->curbuf = nextbuf;
-		}
-	}
-	return len - bleft;
-}
-
-/*
- * Send pending data
- *
- * NOTE: Don't use printk in here because it gets nastily recursive.
- * hvlog can be used to log to the hypervisor buffer
- */
-static void send_buffers(struct port_info *pi)
-{
-	HvLpEvent_Rc hvrc;
-	int nextbuf;
-	struct viocharlpevent *viochar;
-	unsigned long flags;
-
-	spin_lock_irqsave(&consolelock, flags);
-
-	viochar = (struct viocharlpevent *)
-	    vio_get_event_buffer(viomajorsubtype_chario);
-
-	/* Make sure we got a buffer */
-	if (viochar == NULL) {
-		hvlog("\n\rviocons: Can't get viochar buffer in sendBuffers().");
-		spin_unlock_irqrestore(&consolelock, flags);
-		return;
-	}
-
-	if (pi->used == 0) {
-		hvlog("\n\rviocons: in sendbuffers(), but no buffers used.\n");
-		vio_free_event_buffer(viomajorsubtype_chario, viochar);
-		spin_unlock_irqrestore(&consolelock, flags);
-		return;
-	}
-
-	/*
-	 * curbuf points to the buffer we're filling.  We want to
-	 * start sending AFTER this one.  
-	 */
-	nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF;
-
-	/*
-	 * Loop until we find a buffer with the used bit on
-	 */
-	while (test_bit(nextbuf, &pi->used) == 0)
-		nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF;
-
-	initDataEvent(viochar, pi->lp);
-
-	/*
-	 * While we have buffers with data, and our send window
-	 * is open, send them
-	 */
-	while ((test_bit(nextbuf, &pi->used)) &&
-	       ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
-		viochar->len = pi->bufferBytes[nextbuf];
-		viochar->event.xCorrelationToken = pi->seq++;
-		viochar->event.xSizeMinus1 =
-			offsetof(struct viocharlpevent, data) + viochar->len;
-
-		memcpy(viochar->data, pi->buffer[nextbuf], viochar->len);
-
-		hvrc = HvCallEvent_signalLpEvent(&viochar->event);
-		if (hvrc) {
-			/*
-			 * MUST unlock the spinlock before doing a printk
-			 */
-			vio_free_event_buffer(viomajorsubtype_chario, viochar);
-			spin_unlock_irqrestore(&consolelock, flags);
-
-			printk(VIOCONS_KERN_WARN
-			       "error sending event! return code %d\n",
-			       (int)hvrc);
-			return;
-		}
-
-		/*
-		 * clear the used bit, zero the number of bytes in
-		 * this buffer, and move to the next buffer
-		 */
-		clear_bit(nextbuf, &pi->used);
-		pi->bufferBytes[nextbuf] = 0;
-		nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF;
-	}
-
-	/*
-	 * If we have emptied all the buffers, start at 0 again.
-	 * this will re-use any allocated buffers
-	 */
-	if (pi->used == 0) {
-		pi->curbuf = 0;
-
-		if (pi->overflowMessage)
-			pi->overflowMessage = 0;
-
-		if (pi->tty) {
-			tty_wakeup(pi->tty);
-		}
-	}
-
-	vio_free_event_buffer(viomajorsubtype_chario, viochar);
-	spin_unlock_irqrestore(&consolelock, flags);
-}
-
-/*
- * Our internal writer.  Gets called both from the console device and
- * the tty device.  the tty pointer will be NULL if called from the console.
- * Return total number of bytes "written".
- *
- * NOTE: Don't use printk in here because it gets nastily recursive.  hvlog
- * can be used to log to the hypervisor buffer
- */
-static int internal_write(struct port_info *pi, const char *buf, size_t len)
-{
-	HvLpEvent_Rc hvrc;
-	size_t bleft;
-	size_t curlen;
-	const char *curbuf;
-	unsigned long flags;
-	struct viocharlpevent *viochar;
-
-	/*
-	 * Write to the hvlog of inbound data are now done prior to
-	 * calling internal_write() since internal_write() is only called in
-	 * the event that an lp event path is active, which isn't the case for
-	 * logging attempts prior to console initialization.
-	 *
-	 * If there is already data queued for this port, send it prior to
-	 * attempting to send any new data.
-	 */
-	if (pi->used)
-		send_buffers(pi);
-
-	spin_lock_irqsave(&consolelock, flags);
-
-	viochar = vio_get_event_buffer(viomajorsubtype_chario);
-	if (viochar == NULL) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		hvlog("\n\rviocons: Can't get vio buffer in internal_write().");
-		return -EAGAIN;
-	}
-	initDataEvent(viochar, pi->lp);
-
-	curbuf = buf;
-	bleft = len;
-
-	while ((bleft > 0) && (pi->used == 0) &&
-	       ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
-		if (bleft > VIOCHAR_MAX_DATA)
-			curlen = VIOCHAR_MAX_DATA;
-		else
-			curlen = bleft;
-
-		viochar->event.xCorrelationToken = pi->seq++;
-		memcpy(viochar->data, curbuf, curlen);
-		viochar->len = curlen;
-		viochar->event.xSizeMinus1 =
-		    offsetof(struct viocharlpevent, data) + curlen;
-
-		hvrc = HvCallEvent_signalLpEvent(&viochar->event);
-		if (hvrc) {
-			hvlog("viocons: error sending event! %d\n", (int)hvrc);
-			goto out;
-		}
-		curbuf += curlen;
-		bleft -= curlen;
-	}
-
-	/* If we didn't send it all, buffer as much of it as we can. */
-	if (bleft > 0)
-		bleft -= buffer_add(pi, curbuf, bleft);
-out:
-	vio_free_event_buffer(viomajorsubtype_chario, viochar);
-	spin_unlock_irqrestore(&consolelock, flags);
-	return len - bleft;
-}
-
-static struct port_info *get_port_data(struct tty_struct *tty)
-{
-	unsigned long flags;
-	struct port_info *pi;
-
-	spin_lock_irqsave(&consolelock, flags);
-	if (tty) {
-		pi = (struct port_info *)tty->driver_data;
-		if (!pi || viotty_paranoia_check(pi, tty->name,
-					     "get_port_data")) {
-			pi = NULL;
-		}
-	} else
-		/*
-		 * If this is the console device, use the lp from
-		 * the first port entry
-		 */
-		pi = &port_info[0];
-	spin_unlock_irqrestore(&consolelock, flags);
-	return pi;
-}
-
-/*
- * Initialize the common fields in a charLpEvent
- */
-static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp)
-{
-	struct HvLpEvent *hev = &viochar->event;
-
-	memset(viochar, 0, sizeof(struct viocharlpevent));
-
-	hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK |
-		HV_LP_EVENT_INT;
-	hev->xType = HvLpEvent_Type_VirtualIo;
-	hev->xSubtype = viomajorsubtype_chario | viochardata;
-	hev->xSourceLp = HvLpConfig_getLpIndex();
-	hev->xTargetLp = lp;
-	hev->xSizeMinus1 = sizeof(struct viocharlpevent);
-	hev->xSourceInstanceId = viopath_sourceinst(lp);
-	hev->xTargetInstanceId = viopath_targetinst(lp);
-}
-
-/*
- * early console device write
- */
-static void viocons_write_early(struct console *co, const char *s, unsigned count)
-{
-	hvlogOutput(s, count);
-}
-
-/*
- * console device write
- */
-static void viocons_write(struct console *co, const char *s, unsigned count)
-{
-	int index;
-	int begin;
-	struct port_info *pi;
-
-	static const char cr = '\r';
-
-	/*
-	 * Check port data first because the target LP might be valid but
-	 * simply not active, in which case we want to hvlog the output.
-	 */
-	pi = get_port_data(NULL);
-	if (pi == NULL) {
-		hvlog("\n\rviocons_write: unable to get port data.");
-		return;
-	}
-
-	hvlogOutput(s, count);
-
-	if (!viopath_isactive(pi->lp))
-		return;
-
-	/* 
-	 * Any newline character found will cause a
-	 * carriage return character to be emitted as well. 
-	 */
-	begin = 0;
-	for (index = 0; index < count; index++) {
-		if (s[index] == '\n') {
-			/* 
-			 * Newline found. Print everything up to and 
-			 * including the newline
-			 */
-			internal_write(pi, &s[begin], index - begin + 1);
-			begin = index + 1;
-			/* Emit a carriage return as well */
-			internal_write(pi, &cr, 1);
-		}
-	}
-
-	/* If any characters left to write, write them now */
-	if ((index - begin) > 0)
-		internal_write(pi, &s[begin], index - begin);
-}
-
-/*
- * Work out the device associate with this console
- */
-static struct tty_driver *viocons_device(struct console *c, int *index)
-{
-	*index = c->index;
-	return viotty_driver;
-}
-
-/*
- * console device I/O methods
- */
-static struct console viocons_early = {
-	.name = "viocons",
-	.write = viocons_write_early,
-	.flags = CON_PRINTBUFFER,
-	.index = -1,
-};
-
-static struct console viocons = {
-	.name = "viocons",
-	.write = viocons_write,
-	.device = viocons_device,
-	.flags = CON_PRINTBUFFER,
-	.index = -1,
-};
-
-/*
- * TTY Open method
- */
-static int viotty_open(struct tty_struct *tty, struct file *filp)
-{
-	int port;
-	unsigned long flags;
-	struct port_info *pi;
-
-	port = tty->index;
-
-	if ((port < 0) || (port >= VTTY_PORTS))
-		return -ENODEV;
-
-	spin_lock_irqsave(&consolelock, flags);
-
-	pi = &port_info[port];
-	/* If some other TTY is already connected here, reject the open */
-	if ((pi->tty) && (pi->tty != tty)) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		printk(VIOCONS_KERN_WARN
-		       "attempt to open device twice from different ttys\n");
-		return -EBUSY;
-	}
-	tty->driver_data = pi;
-	pi->tty = tty;
-	spin_unlock_irqrestore(&consolelock, flags);
-
-	return 0;
-}
-
-/*
- * TTY Close method
- */
-static void viotty_close(struct tty_struct *tty, struct file *filp)
-{
-	unsigned long flags;
-	struct port_info *pi;
-
-	spin_lock_irqsave(&consolelock, flags);
-	pi = (struct port_info *)tty->driver_data;
-
-	if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_close")) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		return;
-	}
-	if (tty->count == 1)
-		pi->tty = NULL;
-	spin_unlock_irqrestore(&consolelock, flags);
-}
-
-/*
- * TTY Write method
- */
-static int viotty_write(struct tty_struct *tty, const unsigned char *buf,
-		int count)
-{
-	struct port_info *pi;
-
-	pi = get_port_data(tty);
-	if (pi == NULL) {
-		hvlog("\n\rviotty_write: no port data.");
-		return -ENODEV;
-	}
-
-	if (viochar_is_console(pi))
-		hvlogOutput(buf, count);
-
-	/*
-	 * If the path to this LP is closed, don't bother doing anything more.
-	 * just dump the data on the floor and return count.  For some reason
-	 * some user level programs will attempt to probe available tty's and
-	 * they'll attempt a viotty_write on an invalid port which maps to an
-	 * invalid target lp.  If this is the case then ignore the
-	 * viotty_write call and, since the viopath isn't active to this
-	 * partition, return count.
-	 */
-	if (!viopath_isactive(pi->lp))
-		return count;
-
-	return internal_write(pi, buf, count);
-}
-
-/*
- * TTY put_char method
- */
-static int viotty_put_char(struct tty_struct *tty, unsigned char ch)
-{
-	struct port_info *pi;
-
-	pi = get_port_data(tty);
-	if (pi == NULL)
-		return 0;
-
-	/* This will append '\r' as well if the char is '\n' */
-	if (viochar_is_console(pi))
-		hvlogOutput(&ch, 1);
-
-	if (viopath_isactive(pi->lp))
-		internal_write(pi, &ch, 1);
-	return 1;
-}
-
-/*
- * TTY write_room method
- */
-static int viotty_write_room(struct tty_struct *tty)
-{
-	int i;
-	int room = 0;
-	struct port_info *pi;
-	unsigned long flags;
-
-	spin_lock_irqsave(&consolelock, flags);
-	pi = (struct port_info *)tty->driver_data;
-	if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_write_room")) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		return 0;
-	}
-
-	/* If no buffers are used, return the max size. */
-	if (pi->used == 0) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		return VIOCHAR_MAX_DATA * VIOCHAR_NUM_BUF;
-	}
-
-	/*
-	 * We retain the spinlock because we want to get an accurate
-	 * count and it can change on us between each operation if we
-	 * don't hold the spinlock.
-	 */
-	for (i = 0; ((i < VIOCHAR_NUM_BUF) && (room < VIOCHAR_MAX_DATA)); i++)
-		room += (VIOCHAR_MAX_DATA - pi->bufferBytes[i]);
-	spin_unlock_irqrestore(&consolelock, flags);
-
-	if (room > VIOCHAR_MAX_DATA)
-		room = VIOCHAR_MAX_DATA;
-	return room;
-}
-
-/*
- * TTY chars_in_buffer method
- */
-static int viotty_chars_in_buffer(struct tty_struct *tty)
-{
-	return 0;
-}
-
-static int viotty_ioctl(struct tty_struct *tty, struct file *file,
-			unsigned int cmd, unsigned long arg)
-{
-	switch (cmd) {
-	/*
-	 * the ioctls below read/set the flags usually shown in the leds
-	 * don't use them - they will go away without warning
-	 */
-	case KDGETLED:
-	case KDGKBLED:
-		return put_user(0, (char *)arg);
-
-	case KDSKBLED:
-		return 0;
-	}
-	return -ENOIOCTLCMD;
-}
-
-/*
- * Handle an open charLpEvent.  Could be either interrupt or ack
- */
-static void vioHandleOpenEvent(struct HvLpEvent *event)
-{
-	unsigned long flags;
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-	u8 port = cevent->virtual_device;
-	struct port_info *pi;
-	int reject = 0;
-
-	if (hvlpevent_is_ack(event)) {
-		if (port >= VTTY_PORTS)
-			return;
-
-		spin_lock_irqsave(&consolelock, flags);
-		/* Got the lock, don't cause console output */
-
-		pi = &port_info[port];
-		if (event->xRc == HvLpEvent_Rc_Good) {
-			pi->seq = pi->ack = 0;
-			/*
-			 * This line allows connections from the primary
-			 * partition but once one is connected from the
-			 * primary partition nothing short of a reboot
-			 * of linux will allow access from the hosting
-			 * partition again without a required iSeries fix.
-			 */
-			pi->lp = event->xTargetLp;
-		}
-
-		spin_unlock_irqrestore(&consolelock, flags);
-		if (event->xRc != HvLpEvent_Rc_Good)
-			printk(VIOCONS_KERN_WARN
-			       "handle_open_event: event->xRc == (%d).\n",
-			       event->xRc);
-
-		if (event->xCorrelationToken != 0) {
-			atomic_t *aptr= (atomic_t *)event->xCorrelationToken;
-			atomic_set(aptr, 1);
-		} else
-			printk(VIOCONS_KERN_WARN
-			       "weird...got open ack without atomic\n");
-		return;
-	}
-
-	/* This had better require an ack, otherwise complain */
-	if (!hvlpevent_need_ack(event)) {
-		printk(VIOCONS_KERN_WARN "viocharopen without ack bit!\n");
-		return;
-	}
-
-	spin_lock_irqsave(&consolelock, flags);
-	/* Got the lock, don't cause console output */
-
-	/* Make sure this is a good virtual tty */
-	if (port >= VTTY_PORTS) {
-		event->xRc = HvLpEvent_Rc_SubtypeError;
-		cevent->subtype_result_code = viorc_openRejected;
-		/*
-		 * Flag state here since we can't printk while holding
-		 * a spinlock.
-		 */
-		reject = 1;
-	} else {
-		pi = &port_info[port];
-		if ((pi->lp != HvLpIndexInvalid) &&
-				(pi->lp != event->xSourceLp)) {
-			/*
-			 * If this is tty is already connected to a different
-			 * partition, fail.
-			 */
-			event->xRc = HvLpEvent_Rc_SubtypeError;
-			cevent->subtype_result_code = viorc_openRejected;
-			reject = 2;
-		} else {
-			pi->lp = event->xSourceLp;
-			event->xRc = HvLpEvent_Rc_Good;
-			cevent->subtype_result_code = viorc_good;
-			pi->seq = pi->ack = 0;
-			reject = 0;
-		}
-	}
-
-	spin_unlock_irqrestore(&consolelock, flags);
-
-	if (reject == 1)
-		printk(VIOCONS_KERN_WARN "open rejected: bad virtual tty.\n");
-	else if (reject == 2)
-		printk(VIOCONS_KERN_WARN
-			"open rejected: console in exclusive use by another partition.\n");
-
-	/* Return the acknowledgement */
-	HvCallEvent_ackLpEvent(event);
-}
-
-/*
- * Handle a close charLpEvent.  This should ONLY be an Interrupt because the
- * virtual console should never actually issue a close event to the hypervisor
- * because the virtual console never goes away.  A close event coming from the
- * hypervisor simply means that there are no client consoles connected to the
- * virtual console.
- *
- * Regardless of the number of connections masqueraded on the other side of
- * the hypervisor ONLY ONE close event should be called to accompany the ONE
- * open event that is called.  The close event should ONLY be called when NO
- * MORE connections (masqueraded or not) exist on the other side of the
- * hypervisor.
- */
-static void vioHandleCloseEvent(struct HvLpEvent *event)
-{
-	unsigned long flags;
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-	u8 port = cevent->virtual_device;
-
-	if (hvlpevent_is_int(event)) {
-		if (port >= VTTY_PORTS) {
-			printk(VIOCONS_KERN_WARN
-					"close message from invalid virtual device.\n");
-			return;
-		}
-
-		/* For closes, just mark the console partition invalid */
-		spin_lock_irqsave(&consolelock, flags);
-		/* Got the lock, don't cause console output */
-
-		if (port_info[port].lp == event->xSourceLp)
-			port_info[port].lp = HvLpIndexInvalid;
-
-		spin_unlock_irqrestore(&consolelock, flags);
-		printk(VIOCONS_KERN_INFO "close from %d\n", event->xSourceLp);
-	} else
-		printk(VIOCONS_KERN_WARN
-				"got unexpected close acknowlegement\n");
-}
-
-/*
- * Handle a config charLpEvent.  Could be either interrupt or ack
- */
-static void vioHandleConfig(struct HvLpEvent *event)
-{
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-
-	HvCall_writeLogBuffer(cevent->data, cevent->len);
-
-	if (cevent->data[0] == 0x01)
-		printk(VIOCONS_KERN_INFO "window resized to %d: %d: %d: %d\n",
-		       cevent->data[1], cevent->data[2],
-		       cevent->data[3], cevent->data[4]);
-	else
-		printk(VIOCONS_KERN_WARN "unknown config event\n");
-}
-
-/*
- * Handle a data charLpEvent. 
- */
-static void vioHandleData(struct HvLpEvent *event)
-{
-	struct tty_struct *tty;
-	unsigned long flags;
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-	struct port_info *pi;
-	int index;
-	int num_pushed;
-	u8 port = cevent->virtual_device;
-
-	if (port >= VTTY_PORTS) {
-		printk(VIOCONS_KERN_WARN "data on invalid virtual device %d\n",
-				port);
-		return;
-	}
-
-	/*
-	 * Hold the spinlock so that we don't take an interrupt that
-	 * changes tty between the time we fetch the port_info
-	 * pointer and the time we paranoia check.
-	 */
-	spin_lock_irqsave(&consolelock, flags);
-	pi = &port_info[port];
-
-	/*
-	 * Change 05/01/2003 - Ryan Arnold: If a partition other than
-	 * the current exclusive partition tries to send us data
-	 * events then just drop them on the floor because we don't
-	 * want his stinking data.  He isn't authorized to receive
-	 * data because he wasn't the first one to get the console,
-	 * therefore he shouldn't be allowed to send data either.
-	 * This will work without an iSeries fix.
-	 */
-	if (pi->lp != event->xSourceLp) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		return;
-	}
-
-	tty = pi->tty;
-	if (tty == NULL) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		printk(VIOCONS_KERN_WARN "no tty for virtual device %d\n",
-				port);
-		return;
-	}
-
-	if (tty->magic != TTY_MAGIC) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		printk(VIOCONS_KERN_WARN "tty bad magic\n");
-		return;
-	}
-
-	/*
-	 * Just to be paranoid, make sure the tty points back to this port
-	 */
-	pi = (struct port_info *)tty->driver_data;
-	if (!pi || viotty_paranoia_check(pi, tty->name, "vioHandleData")) {
-		spin_unlock_irqrestore(&consolelock, flags);
-		return;
-	}
-	spin_unlock_irqrestore(&consolelock, flags);
-
-	/*
-	 * Change 07/21/2003 - Ryan Arnold: functionality added to
-	 * support sysrq utilizing ^O as the sysrq key.  The sysrq
-	 * functionality will only work if built into the kernel and
-	 * then only if sysrq is enabled through the proc filesystem.
-	 */
-	num_pushed = 0;
-	for (index = 0; index < cevent->len; index++) {
-		/*
-		 * Will be optimized away if !CONFIG_MAGIC_SYSRQ:
-		 */
-		if (sysrq_on()) {
-			/* 0x0f is the ascii character for ^O */
-			if (cevent->data[index] == '\x0f') {
-				vio_sysrq_pressed = 1;
-				/*
-				 * continue because we don't want to add
-				 * the sysrq key into the data string.
-				 */
-				continue;
-			} else if (vio_sysrq_pressed) {
-				handle_sysrq(cevent->data[index], tty);
-				vio_sysrq_pressed = 0;
-				/*
-				 * continue because we don't want to add
-				 * the sysrq sequence into the data string.
-				 */
-				continue;
-			}
-		}
-		/*
-		 * The sysrq sequence isn't included in this check if
-		 * sysrq is enabled and compiled into the kernel because
-		 * the sequence will never get inserted into the buffer.
-		 * Don't attempt to copy more data into the buffer than we
-		 * have room for because it would fail without indication.
-		 */
-		if(tty_insert_flip_char(tty, cevent->data[index], TTY_NORMAL) == 0) {
-			printk(VIOCONS_KERN_WARN "input buffer overflow!\n");
-			break;
-		}
-		num_pushed++;
-	}
-
-	if (num_pushed)
-		tty_flip_buffer_push(tty);
-}
-
-/*
- * Handle an ack charLpEvent. 
- */
-static void vioHandleAck(struct HvLpEvent *event)
-{
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-	unsigned long flags;
-	u8 port = cevent->virtual_device;
-
-	if (port >= VTTY_PORTS) {
-		printk(VIOCONS_KERN_WARN "data on invalid virtual device\n");
-		return;
-	}
-
-	spin_lock_irqsave(&consolelock, flags);
-	port_info[port].ack = event->xCorrelationToken;
-	spin_unlock_irqrestore(&consolelock, flags);
-
-	if (port_info[port].used)
-		send_buffers(&port_info[port]);
-}
-
-/*
- * Handle charLpEvents and route to the appropriate routine
- */
-static void vioHandleCharEvent(struct HvLpEvent *event)
-{
-	int charminor;
-
-	if (event == NULL)
-		return;
-
-	charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
-	switch (charminor) {
-	case viocharopen:
-		vioHandleOpenEvent(event);
-		break;
-	case viocharclose:
-		vioHandleCloseEvent(event);
-		break;
-	case viochardata:
-		vioHandleData(event);
-		break;
-	case viocharack:
-		vioHandleAck(event);
-		break;
-	case viocharconfig:
-		vioHandleConfig(event);
-		break;
-	default:
-		if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {
-			event->xRc = HvLpEvent_Rc_InvalidSubtype;
-			HvCallEvent_ackLpEvent(event);
-		}
-	}
-}
-
-/*
- * Send an open event
- */
-static int send_open(HvLpIndex remoteLp, void *sem)
-{
-	return HvCallEvent_signalLpEventFast(remoteLp,
-			HvLpEvent_Type_VirtualIo,
-			viomajorsubtype_chario | viocharopen,
-			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
-			viopath_sourceinst(remoteLp),
-			viopath_targetinst(remoteLp),
-			(u64)(unsigned long)sem, VIOVERSION << 16,
-			0, 0, 0, 0);
-}
-
-static const struct tty_operations serial_ops = {
-	.open = viotty_open,
-	.close = viotty_close,
-	.write = viotty_write,
-	.put_char = viotty_put_char,
-	.write_room = viotty_write_room,
-	.chars_in_buffer = viotty_chars_in_buffer,
-	.ioctl = viotty_ioctl,
-};
-
-static int __init viocons_init2(void)
-{
-	atomic_t wait_flag;
-	int rc;
-
-	if (!firmware_has_feature(FW_FEATURE_ISERIES))
-		return -ENODEV;
-
-	/* +2 for fudge */
-	rc = viopath_open(HvLpConfig_getPrimaryLpIndex(),
-			viomajorsubtype_chario, VIOCHAR_WINDOW + 2);
-	if (rc)
-		printk(VIOCONS_KERN_WARN "error opening to primary %d\n", rc);
-
-	if (viopath_hostLp == HvLpIndexInvalid)
-		vio_set_hostlp();
-
-	/*
-	 * And if the primary is not the same as the hosting LP, open to the 
-	 * hosting lp
-	 */
-	if ((viopath_hostLp != HvLpIndexInvalid) &&
-	    (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) {
-		printk(VIOCONS_KERN_INFO "open path to hosting (%d)\n",
-				viopath_hostLp);
-		rc = viopath_open(viopath_hostLp, viomajorsubtype_chario,
-				VIOCHAR_WINDOW + 2);	/* +2 for fudge */
-		if (rc)
-			printk(VIOCONS_KERN_WARN
-				"error opening to partition %d: %d\n",
-				viopath_hostLp, rc);
-	}
-
-	if (vio_setHandler(viomajorsubtype_chario, vioHandleCharEvent) < 0)
-		printk(VIOCONS_KERN_WARN
-				"error seting handler for console events!\n");
-
-	/*
-	 * First, try to open the console to the hosting lp.
-	 * Wait on a semaphore for the response.
-	 */
-	atomic_set(&wait_flag, 0);
-	if ((viopath_isactive(viopath_hostLp)) &&
-	    (send_open(viopath_hostLp, (void *)&wait_flag) == 0)) {
-		printk(VIOCONS_KERN_INFO "hosting partition %d\n",
-			viopath_hostLp);
-		while (atomic_read(&wait_flag) == 0)
-			mb();
-		atomic_set(&wait_flag, 0);
-	}
-
-	/*
-	 * If we don't have an active console, try the primary
-	 */
-	if ((!viopath_isactive(port_info[0].lp)) &&
-	    (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) &&
-	    (send_open(HvLpConfig_getPrimaryLpIndex(), (void *)&wait_flag)
-	     == 0)) {
-		printk(VIOCONS_KERN_INFO "opening console to primary partition\n");
-		while (atomic_read(&wait_flag) == 0)
-			mb();
-	}
-
-	/* Initialize the tty_driver structure */
-	viotty_driver = alloc_tty_driver(VTTY_PORTS);
-	viotty_driver->owner = THIS_MODULE;
-	viotty_driver->driver_name = "vioconsole";
-	viotty_driver->name = "tty";
-	viotty_driver->name_base = 1;
-	viotty_driver->major = TTY_MAJOR;
-	viotty_driver->minor_start = 1;
-	viotty_driver->type = TTY_DRIVER_TYPE_CONSOLE;
-	viotty_driver->subtype = 1;
-	viotty_driver->init_termios = tty_std_termios;
-	viotty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
-	tty_set_operations(viotty_driver, &serial_ops);
-
-	if (tty_register_driver(viotty_driver)) {
-		printk(VIOCONS_KERN_WARN "couldn't register console driver\n");
-		put_tty_driver(viotty_driver);
-		viotty_driver = NULL;
-	}
-
-	unregister_console(&viocons_early);
-	register_console(&viocons);
-
-	return 0;
-}
-
-static int __init viocons_init(void)
-{
-	int i;
-
-	if (!firmware_has_feature(FW_FEATURE_ISERIES))
-		return -ENODEV;
-
-	printk(VIOCONS_KERN_INFO "registering console\n");
-	for (i = 0; i < VTTY_PORTS; i++) {
-		port_info[i].lp = HvLpIndexInvalid;
-		port_info[i].magic = VIOTTY_MAGIC;
-	}
-	HvCall_setLogBufferFormatAndCodepage(HvCall_LogBuffer_ASCII, 437);
-	add_preferred_console("viocons", 0, NULL);
-	register_console(&viocons_early);
-	return 0;
-}
-
-console_initcall(viocons_init);
-module_init(viocons_init2);