Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

Pull powerpc merge from Benjamin Herrenschmidt:
 "Here's the powerpc batch for this merge window.  It is going to be a
  bit more nasty than usual as in touching things outside of
  arch/powerpc mostly due to the big iSeriesectomy :-) We finally got
  rid of the bugger (legacy iSeries support) which was a PITA to
  maintain and that nobody really used anymore.

  Here are some of the highlights:

   - Legacy iSeries is gone.  Thanks Stephen ! There's still some bits
     and pieces remaining if you do a grep -ir series arch/powerpc but
     they are harmless and will be removed in the next few weeks
     hopefully.

   - The 'fadump' functionality (Firmware Assisted Dump) replaces the
     previous (equivalent) "pHyp assisted dump"...  it's a rewrite of a
     mechanism to get the hypervisor to do crash dumps on pSeries, the
     new implementation hopefully being much more reliable.  Thanks
     Mahesh Salgaonkar.

   - The "EEH" code (pSeries PCI error handling & recovery) got a big
     spring cleaning, motivated by the need to be able to implement a
     new backend for it on top of some new different type of firwmare.

     The work isn't complete yet, but a good chunk of the cleanups is
     there.  Note that this adds a field to struct device_node which is
     not very nice and which Grant objects to.  I will have a patch soon
     that moves that to a powerpc private data structure (hopefully
     before rc1) and we'll improve things further later on (hopefully
     getting rid of the need for that pointer completely).  Thanks Gavin
     Shan.

   - I dug into our exception & interrupt handling code to improve the
     way we do lazy interrupt handling (and make it work properly with
     "edge" triggered interrupt sources), and while at it found & fixed
     a wagon of issues in those areas, including adding support for page
     fault retry & fatal signals on page faults.

   - Your usual random batch of small fixes & updates, including a bunch
     of new embedded boards, both Freescale and APM based ones, etc..."

I fixed up some conflicts with the generalized irq-domain changes from
Grant Likely, hopefully correctly.

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (141 commits)
  powerpc/ps3: Do not adjust the wrapper load address
  powerpc: Remove the rest of the legacy iSeries include files
  powerpc: Remove the remaining CONFIG_PPC_ISERIES pieces
  init: Remove CONFIG_PPC_ISERIES
  powerpc: Remove FW_FEATURE ISERIES from arch code
  tty/hvc_vio: FW_FEATURE_ISERIES is no longer selectable
  powerpc/spufs: Fix double unlocks
  powerpc/5200: convert mpc5200 to use of_platform_populate()
  powerpc/mpc5200: add options to mpc5200_defconfig
  powerpc/mpc52xx: add a4m072 board support
  powerpc/mpc5200: update mpc5200_defconfig to fit for charon board
  Documentation/powerpc/mpc52xx.txt: Checkpatch cleanup
  powerpc/44x: Add additional device support for APM821xx SoC and Bluestone board
  powerpc/44x: Add support PCI-E for APM821xx SoC and Bluestone board
  MAINTAINERS: Update PowerPC 4xx tree
  powerpc/44x: The bug fixed support for APM821xx SoC and Bluestone board
  powerpc: document the FSL MPIC message register binding
  powerpc: add support for MPIC message register API
  powerpc/fsl: Added aliased MSIIR register address to MSI node in dts
  powerpc/85xx: mpc8548cds - add 36-bit dts
  ...

5 files changed, 11 insertions, 615 deletions

diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
index 4222035acfb7..48cb8d3d1758 100644
--- a/drivers/tty/hvc/Kconfig
+++ b/drivers/tty/hvc/Kconfig
@@ -24,16 +24,6 @@ config HVC_OLD_HVSI
 	depends on HVC_CONSOLE
 	default n
 
-config HVC_ISERIES
-	bool "iSeries Hypervisor Virtual Console support"
-	depends on PPC_ISERIES
-	default y
-	select HVC_DRIVER
-	select HVC_IRQ
-	select VIOPATH
-	help
-	  iSeries machines support a hypervisor virtual console.
-
 config HVC_OPAL
 	bool "OPAL Console support"
 	depends on PPC_POWERNV
@@ -81,6 +71,10 @@ config HVC_UDBG
        depends on PPC && EXPERIMENTAL
        select HVC_DRIVER
        default n
+       help
+         This is meant to be used during HW bring up or debugging when
+	 no other console mechanism exist but udbg, to get you a quick
+	 console for userspace. Do NOT enable in production kernels. 
 
 config HVC_DCC
        bool "ARM JTAG DCC console"
diff --git a/drivers/tty/hvc/Makefile b/drivers/tty/hvc/Makefile
index 89abf40bc73d..4ca3723b0a3a 100644
--- a/drivers/tty/hvc/Makefile
+++ b/drivers/tty/hvc/Makefile
@@ -1,7 +1,6 @@
 obj-$(CONFIG_HVC_CONSOLE)	+= hvc_vio.o hvsi_lib.o
 obj-$(CONFIG_HVC_OPAL)		+= hvc_opal.o hvsi_lib.o
 obj-$(CONFIG_HVC_OLD_HVSI)	+= hvsi.o
-obj-$(CONFIG_HVC_ISERIES)	+= hvc_iseries.o
 obj-$(CONFIG_HVC_RTAS)		+= hvc_rtas.o
 obj-$(CONFIG_HVC_TILE)		+= hvc_tile.o
 obj-$(CONFIG_HVC_DCC)		+= hvc_dcc.o
diff --git a/drivers/tty/hvc/hvc_iseries.c b/drivers/tty/hvc/hvc_iseries.c
deleted file mode 100644
index 3f4a897bf4d7..000000000000
--- a/drivers/tty/hvc/hvc_iseries.c
+++ /dev/null
@@ -1,599 +0,0 @@
-/*
- * iSeries vio driver interface to hvc_console.c
- *
- * This code is based heavily on hvc_vio.c and viocons.c
- *
- * Copyright (C) 2006 Stephen Rothwell, 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) any 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 <stdarg.h>
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/console.h>
-
-#include <asm/hvconsole.h>
-#include <asm/vio.h>
-#include <asm/prom.h>
-#include <asm/firmware.h>
-#include <asm/iseries/vio.h>
-#include <asm/iseries/hv_call.h>
-#include <asm/iseries/hv_lp_config.h>
-#include <asm/iseries/hv_lp_event.h>
-
-#include "hvc_console.h"
-
-#define VTTY_PORTS 10
-
-static DEFINE_SPINLOCK(consolelock);
-static DEFINE_SPINLOCK(consoleloglock);
-
-static const char hvc_driver_name[] = "hvc_console";
-
-#define IN_BUF_SIZE	200
-
-/*
- * Our port information.
- */
-static struct port_info {
-	HvLpIndex lp;
-	u64 seq;	/* sequence number of last HV send */
-	u64 ack;	/* last ack from HV */
-	struct hvc_struct *hp;
-	int in_start;
-	int in_end;
-	unsigned char in_buf[IN_BUF_SIZE];
-} port_info[VTTY_PORTS] = {
-	[ 0 ... VTTY_PORTS - 1 ] = {
-		.lp = HvLpIndexInvalid
-	}
-};
-
-#define viochar_is_console(pi)	((pi) == &port_info[0])
-
-static struct vio_device_id hvc_driver_table[] __devinitdata = {
-	{"serial", "IBM,iSeries-vty"},
-	{ "", "" }
-};
-MODULE_DEVICE_TABLE(vio, hvc_driver_table);
-
-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);
-}
-
-/*
- * Initialize the common fields in a charLpEvent
- */
-static void init_data_event(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);
-}
-
-static int get_chars(uint32_t vtermno, char *buf, int count)
-{
-	struct port_info *pi;
-	int n = 0;
-	unsigned long flags;
-
-	if (vtermno >= VTTY_PORTS)
-		return -EINVAL;
-	if (count == 0)
-		return 0;
-
-	pi = &port_info[vtermno];
-	spin_lock_irqsave(&consolelock, flags);
-
-	if (pi->in_end == 0)
-		goto done;
-
-	n = pi->in_end - pi->in_start;
-	if (n > count)
-		n = count;
-	memcpy(buf, &pi->in_buf[pi->in_start], n);
-	pi->in_start += n;
-	if (pi->in_start == pi->in_end) {
-		pi->in_start = 0;
-		pi->in_end = 0;
-	}
-done:
-	spin_unlock_irqrestore(&consolelock, flags);
-	return n;
-}
-
-static int put_chars(uint32_t vtermno, const char *buf, int count)
-{
-	struct viocharlpevent *viochar;
-	struct port_info *pi;
-	HvLpEvent_Rc hvrc;
-	unsigned long flags;
-	int sent = 0;
-
-	if (vtermno >= VTTY_PORTS)
-		return -EINVAL;
-
-	pi = &port_info[vtermno];
-
-	spin_lock_irqsave(&consolelock, flags);
-
-	if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) {
-		HvCall_writeLogBuffer(buf, count);
-		sent = count;
-		goto done;
-	}
-
-	viochar = vio_get_event_buffer(viomajorsubtype_chario);
-	if (viochar == NULL) {
-		hvlog("\n\rviocons: Can't get viochar buffer.");
-		goto done;
-	}
-
-	while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
-		int len;
-
-		len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count;
-
-		if (viochar_is_console(pi))
-			HvCall_writeLogBuffer(buf, len);
-
-		init_data_event(viochar, pi->lp);
-
-		viochar->len = len;
-		viochar->event.xCorrelationToken = pi->seq++;
-		viochar->event.xSizeMinus1 =
-			offsetof(struct viocharlpevent, data) + len;
-
-		memcpy(viochar->data, buf, len);
-
-		hvrc = HvCallEvent_signalLpEvent(&viochar->event);
-		if (hvrc)
-			hvlog("\n\rerror sending event! return code %d\n\r",
-				(int)hvrc);
-		sent += len;
-		count -= len;
-		buf += len;
-	}
-
-	vio_free_event_buffer(viomajorsubtype_chario, viochar);
-done:
-	spin_unlock_irqrestore(&consolelock, flags);
-	return sent;
-}
-
-static const struct hv_ops hvc_get_put_ops = {
-	.get_chars = get_chars,
-	.put_chars = put_chars,
-	.notifier_add = notifier_add_irq,
-	.notifier_del = notifier_del_irq,
-	.notifier_hangup = notifier_hangup_irq,
-};
-
-static int __devinit hvc_vio_probe(struct vio_dev *vdev,
-			const struct vio_device_id *id)
-{
-	struct hvc_struct *hp;
-	struct port_info *pi;
-
-	/* probed with invalid parameters. */
-	if (!vdev || !id)
-		return -EPERM;
-
-	if (vdev->unit_address >= VTTY_PORTS)
-		return -ENODEV;
-
-	pi = &port_info[vdev->unit_address];
-
-	hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
-			VIOCHAR_MAX_DATA);
-	if (IS_ERR(hp))
-		return PTR_ERR(hp);
-	pi->hp = hp;
-	dev_set_drvdata(&vdev->dev, pi);
-
-	return 0;
-}
-
-static int __devexit hvc_vio_remove(struct vio_dev *vdev)
-{
-	struct port_info *pi = dev_get_drvdata(&vdev->dev);
-	struct hvc_struct *hp = pi->hp;
-
-	return hvc_remove(hp);
-}
-
-static struct vio_driver hvc_vio_driver = {
-	.id_table	= hvc_driver_table,
-	.probe		= hvc_vio_probe,
-	.remove		= __devexit_p(hvc_vio_remove),
-	.driver		= {
-		.name	= hvc_driver_name,
-		.owner	= THIS_MODULE,
-	}
-};
-
-static void hvc_open_event(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);
-
-		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(KERN_WARNING
-			       "hvc: 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(KERN_WARNING
-			       "hvc: weird...got open ack without atomic\n");
-		return;
-	}
-
-	/* This had better require an ack, otherwise complain */
-	if (!hvlpevent_need_ack(event)) {
-		printk(KERN_WARNING "hvc: viocharopen without ack bit!\n");
-		return;
-	}
-
-	spin_lock_irqsave(&consolelock, flags);
-
-	/* 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
-		 * the consolelock 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;
-		}
-	}
-
-	spin_unlock_irqrestore(&consolelock, flags);
-
-	if (reject == 1)
-		printk(KERN_WARNING "hvc: open rejected: bad virtual tty.\n");
-	else if (reject == 2)
-		printk(KERN_WARNING "hvc: 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.
- */
-static void hvc_close_event(struct HvLpEvent *event)
-{
-	unsigned long flags;
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-	u8 port = cevent->virtual_device;
-
-	if (!hvlpevent_is_int(event)) {
-		printk(KERN_WARNING
-			"hvc: got unexpected close acknowledgement\n");
-		return;
-	}
-
-	if (port >= VTTY_PORTS) {
-		printk(KERN_WARNING
-			"hvc: close message from invalid virtual device.\n");
-		return;
-	}
-
-	/* For closes, just mark the console partition invalid */
-	spin_lock_irqsave(&consolelock, flags);
-
-	if (port_info[port].lp == event->xSourceLp)
-		port_info[port].lp = HvLpIndexInvalid;
-
-	spin_unlock_irqrestore(&consolelock, flags);
-}
-
-static void hvc_data_event(struct HvLpEvent *event)
-{
-	unsigned long flags;
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-	struct port_info *pi;
-	int n;
-	u8 port = cevent->virtual_device;
-
-	if (port >= VTTY_PORTS) {
-		printk(KERN_WARNING "hvc: data on invalid virtual device %d\n",
-				port);
-		return;
-	}
-	if (cevent->len == 0)
-		return;
-
-	/*
-	 * 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.
-	 */
-	pi = &port_info[port];
-	if (pi->lp != event->xSourceLp)
-		return;
-
-	spin_lock_irqsave(&consolelock, flags);
-
-	n = IN_BUF_SIZE - pi->in_end;
-	if (n > cevent->len)
-		n = cevent->len;
-	if (n > 0) {
-		memcpy(&pi->in_buf[pi->in_end], cevent->data, n);
-		pi->in_end += n;
-	}
-	spin_unlock_irqrestore(&consolelock, flags);
-	if (n == 0)
-		printk(KERN_WARNING "hvc: input buffer overflow\n");
-}
-
-static void hvc_ack_event(struct HvLpEvent *event)
-{
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-	unsigned long flags;
-	u8 port = cevent->virtual_device;
-
-	if (port >= VTTY_PORTS) {
-		printk(KERN_WARNING "hvc: data on invalid virtual device\n");
-		return;
-	}
-
-	spin_lock_irqsave(&consolelock, flags);
-	port_info[port].ack = event->xCorrelationToken;
-	spin_unlock_irqrestore(&consolelock, flags);
-}
-
-static void hvc_config_event(struct HvLpEvent *event)
-{
-	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
-
-	if (cevent->data[0] == 0x01)
-		printk(KERN_INFO "hvc: window resized to %d: %d: %d: %d\n",
-		       cevent->data[1], cevent->data[2],
-		       cevent->data[3], cevent->data[4]);
-	else
-		printk(KERN_WARNING "hvc: unknown config event\n");
-}
-
-static void hvc_handle_event(struct HvLpEvent *event)
-{
-	int charminor;
-
-	if (event == NULL)
-		return;
-
-	charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
-	switch (charminor) {
-	case viocharopen:
-		hvc_open_event(event);
-		break;
-	case viocharclose:
-		hvc_close_event(event);
-		break;
-	case viochardata:
-		hvc_data_event(event);
-		break;
-	case viocharack:
-		hvc_ack_event(event);
-		break;
-	case viocharconfig:
-		hvc_config_event(event);
-		break;
-	default:
-		if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {
-			event->xRc = HvLpEvent_Rc_InvalidSubtype;
-			HvCallEvent_ackLpEvent(event);
-		}
-	}
-}
-
-static int __init 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 int __init hvc_vio_init(void)
-{
-	atomic_t wait_flag;
-	int rc;
-
-	if (!firmware_has_feature(FW_FEATURE_ISERIES))
-		return -EIO;
-
-	/* +2 for fudge */
-	rc = viopath_open(HvLpConfig_getPrimaryLpIndex(),
-			viomajorsubtype_chario, VIOCHAR_WINDOW + 2);
-	if (rc)
-		printk(KERN_WARNING "hvc: 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(KERN_INFO "hvc: open path to hosting (%d)\n",
-				viopath_hostLp);
-		rc = viopath_open(viopath_hostLp, viomajorsubtype_chario,
-				VIOCHAR_WINDOW + 2);	/* +2 for fudge */
-		if (rc)
-			printk(KERN_WARNING
-				"error opening to partition %d: %d\n",
-				viopath_hostLp, rc);
-	}
-
-	if (vio_setHandler(viomajorsubtype_chario, hvc_handle_event) < 0)
-		printk(KERN_WARNING
-			"hvc: 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, &wait_flag) == 0)) {
-		printk(KERN_INFO "hvc: 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(), &wait_flag) == 0)) {
-		printk(KERN_INFO "hvc: opening console to primary partition\n");
-		while (atomic_read(&wait_flag) == 0)
-			mb();
-	}
-
-	/* Register as a vio device to receive callbacks */
-	rc = vio_register_driver(&hvc_vio_driver);
-
-	return rc;
-}
-module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
-
-static void __exit hvc_vio_exit(void)
-{
-	vio_unregister_driver(&hvc_vio_driver);
-}
-module_exit(hvc_vio_exit);
-
-/* the device tree order defines our numbering */
-static int __init hvc_find_vtys(void)
-{
-	struct device_node *vty;
-	int num_found = 0;
-
-	for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
-			vty = of_find_node_by_name(vty, "vty")) {
-		const uint32_t *vtermno;
-
-		/* We have statically defined space for only a certain number
-		 * of console adapters.
-		 */
-		if ((num_found >= MAX_NR_HVC_CONSOLES) ||
-				(num_found >= VTTY_PORTS)) {
-			of_node_put(vty);
-			break;
-		}
-
-		vtermno = of_get_property(vty, "reg", NULL);
-		if (!vtermno)
-			continue;
-
-		if (!of_device_is_compatible(vty, "IBM,iSeries-vty"))
-			continue;
-
-		if (num_found == 0)
-			add_preferred_console("hvc", 0, NULL);
-		hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
-		++num_found;
-	}
-
-	return num_found;
-}
-console_initcall(hvc_find_vtys);
diff --git a/drivers/tty/hvc/hvc_udbg.c b/drivers/tty/hvc/hvc_udbg.c
index 4c9b13e7748c..72228276fe31 100644
--- a/drivers/tty/hvc/hvc_udbg.c
+++ b/drivers/tty/hvc/hvc_udbg.c
@@ -36,7 +36,7 @@ static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
 {
 	int i;
 
-	for (i = 0; i < count; i++)
+	for (i = 0; i < count && udbg_putc; i++)
 		udbg_putc(buf[i]);
 
 	return i;
@@ -67,6 +67,9 @@ static int __init hvc_udbg_init(void)
 {
 	struct hvc_struct *hp;
 
+	if (!udbg_putc)
+		return -ENODEV;
+
 	BUG_ON(hvc_udbg_dev);
 
 	hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16);
@@ -88,6 +91,9 @@ module_exit(hvc_udbg_exit);
 
 static int __init hvc_udbg_console_init(void)
 {
+	if (!udbg_putc)
+		return -ENODEV;
+
 	hvc_instantiate(0, 0, &hvc_udbg_ops);
 	add_preferred_console("hvc", 0, NULL);
 
diff --git a/drivers/tty/hvc/hvc_vio.c b/drivers/tty/hvc/hvc_vio.c
index fc3c3ad6c072..3a0d53d6368f 100644
--- a/drivers/tty/hvc/hvc_vio.c
+++ b/drivers/tty/hvc/hvc_vio.c
@@ -46,7 +46,6 @@
 #include <asm/hvconsole.h>
 #include <asm/vio.h>
 #include <asm/prom.h>
-#include <asm/firmware.h>
 #include <asm/hvsi.h>
 #include <asm/udbg.h>
 
@@ -322,9 +321,6 @@ static int __init hvc_vio_init(void)
 {
 	int rc;
 
-	if (firmware_has_feature(FW_FEATURE_ISERIES))
-		return -EIO;
-
 	/* Register as a vio device to receive callbacks */
 	rc = vio_register_driver(&hvc_vio_driver);