47 files changed, 1058 insertions, 207 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index c40e487d9f5c..320ad7ba11d4 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -495,6 +495,21 @@ config LEGACY_PTY_COUNT
           When not in use, each legacy PTY occupies 12 bytes on 32-bit
           architectures and 24 bytes on 64-bit architectures.
 
+config BRIQ_PANEL
+        tristate 'Total Impact briQ front panel driver'
+        depends on PPC
+        ---help---
+          The briQ is a small footprint CHRP computer with a frontpanel VFD, a
+          tristate led and two switches. It is the size of a CDROM drive.
+
+          If you have such one and want anything showing on the VFD then you
+          must answer Y here.
+
+          To compile this driver as a module, choose M here: the
+          module will be called briq_panel.
+
+          It's safe to say N here.
+
 config PRINTER
         tristate "Parallel printer support"
         depends on PARPORT
@@ -596,6 +611,13 @@ config HVC_CONSOLE
           console. This driver allows each pSeries partition to have a console
           which is accessed via the HMC.
 
+config HVC_ISERIES
+        bool "iSeries Hypervisor Virtual Console support"
+        depends on PPC_ISERIES && !VIOCONS
+        select HVC_DRIVER
+        help
+          iSeries machines support a hypervisor virtual console.
+
 config HVC_RTAS
         bool "IBM RTAS Console support"
         depends on PPC_RTAS
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 6e0f4469d8bb..8c6dfc621520 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
 obj-$(CONFIG_SX)                += sx.o generic_serial.o
 obj-$(CONFIG_RIO)               += rio/ generic_serial.o
 obj-$(CONFIG_HVC_CONSOLE)       += hvc_vio.o hvsi.o
+obj-$(CONFIG_HVC_ISERIES)       += hvc_iseries.o
 obj-$(CONFIG_HVC_RTAS)          += hvc_rtas.o
 obj-$(CONFIG_HVC_DRIVER)        += hvc_console.o
 obj-$(CONFIG_RAW_DRIVER)        += raw.o
@@ -51,6 +52,7 @@ obj-$(CONFIG_VIOCONS)		+= viocons.o
 obj-$(CONFIG_VIOTAPE)           += viotape.o
 obj-$(CONFIG_HVCS)              += hvcs.o
 obj-$(CONFIG_SGI_MBCS)          += mbcs.o
+obj-$(CONFIG_BRIQ_PANEL)        += briq_panel.o
 
 obj-$(CONFIG_PRINTER)           += lp.o
 obj-$(CONFIG_TIPAR)             += tipar.o
diff --git a/drivers/char/agp/uninorth-agp.c b/drivers/char/agp/uninorth-agp.c
index 1de1b12043bf..91b71e750ee1 100644
--- a/drivers/char/agp/uninorth-agp.c
+++ b/drivers/char/agp/uninorth-agp.c
@@ -601,8 +601,8 @@ static int __devinit agp_uninorth_probe(struct pci_dev *pdev,
                 uninorth_node = of_find_node_by_name(NULL, "u3");
         }
         if (uninorth_node) {
-                int *revprop = (int *)
-                        get_property(uninorth_node, "device-rev", NULL);
+                const int *revprop = get_property(uninorth_node,
+                                "device-rev", NULL);
                 if (revprop != NULL)
                         uninorth_rev = *revprop & 0x3f;
                 of_node_put(uninorth_node);
diff --git a/drivers/char/briq_panel.c b/drivers/char/briq_panel.c
new file mode 100644
index 000000000000..a0e5eac5f33a
--- /dev/null
+++ b/drivers/char/briq_panel.c
@@ -0,0 +1,268 @@
+/*
+ * Drivers for the Total Impact PPC based computer "BRIQ"
+ * by Dr. Karsten Jeppesen
+ *
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/tty.h>
+#include <linux/timer.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/wait.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+
+#define         BRIQ_PANEL_MINOR        156
+#define         BRIQ_PANEL_VFD_IOPORT   0x0390
+#define         BRIQ_PANEL_LED_IOPORT   0x0398
+#define         BRIQ_PANEL_VER          "1.1 (04/20/2002)"
+#define         BRIQ_PANEL_MSG0         "Loading Linux"
+
+static int              vfd_is_open;
+static unsigned char    vfd[40];
+static int              vfd_cursor;
+static unsigned char    ledpb, led;
+
+static void update_vfd(void)
+{
+        int     i;
+
+        /* cursor home */
+        outb(0x02, BRIQ_PANEL_VFD_IOPORT);
+        for (i=0; i<20; i++)
+                outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
+
+        /* cursor to next line */
+        outb(0xc0, BRIQ_PANEL_VFD_IOPORT);
+        for (i=20; i<40; i++)
+                outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
+
+}
+
+static void set_led(char state)
+{
+        if (state == 'R')
+                led = 0x01;
+        else if (state == 'G')
+                led = 0x02;
+        else if (state == 'Y')
+                led = 0x03;
+        else if (state == 'X')
+                led = 0x00;
+        outb(led, BRIQ_PANEL_LED_IOPORT);
+}
+
+static int briq_panel_open(struct inode *ino, struct file *filep)
+{
+        /* enforce single access */
+        if (vfd_is_open)
+                return -EBUSY;
+        vfd_is_open = 1;
+
+        return 0;
+}
+
+static int briq_panel_release(struct inode *ino, struct file *filep)
+{
+        if (!vfd_is_open)
+                return -ENODEV;
+
+        vfd_is_open = 0;
+
+        return 0;
+}
+
+static ssize_t briq_panel_read(struct file *file, char *buf, size_t count,
+                         loff_t *ppos)
+{
+        unsigned short c;
+        unsigned char cp;
+
+#if 0   /*  Can't seek (pread) on this device  */
+        if (ppos != &file->f_pos)
+                return -ESPIPE;
+#endif
+
+        if (!vfd_is_open)
+                return -ENODEV;
+
+        c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003);
+        set_led(' ');
+        /* upper button released */
+        if ((!(ledpb & 0x0004)) && (c & 0x0004)) {
+                cp = ' ';
+                ledpb = c;
+                if (copy_to_user(buf, &cp, 1))
+                        return -EFAULT;
+                return 1;
+        }
+        /* lower button released */
+        else if ((!(ledpb & 0x0008)) && (c & 0x0008)) {
+                cp = '\r';
+                ledpb = c;
+                if (copy_to_user(buf, &cp, 1))
+                        return -EFAULT;
+                return 1;
+        } else {
+                ledpb = c;
+                return 0;
+        }
+}
+
+static void scroll_vfd( void )
+{
+        int     i;
+
+        for (i=0; i<20; i++) {
+                vfd[i] = vfd[i+20];
+                vfd[i+20] = ' ';
+        }
+        vfd_cursor = 20;
+}
+
+static ssize_t briq_panel_write(struct file *file, const char *buf, size_t len,
+                          loff_t *ppos)
+{
+        size_t indx = len;
+        int i, esc = 0;
+
+#if 0   /*  Can't seek (pwrite) on this device  */
+        if (ppos != &file->f_pos)
+                return -ESPIPE;
+#endif
+
+        if (!vfd_is_open)
+                return -EBUSY;
+
+        for (;;) {
+                if (!indx)
+                        break;
+                if (esc) {
+                        set_led(*buf);
+                        esc = 0;
+                } else if (*buf == 27) {
+                        esc = 1;
+                } else if (*buf == 12) {
+                        /* do a form feed */
+                        for (i=0; i<40; i++)
+                                vfd[i] = ' ';
+                        vfd_cursor = 0;
+                } else if (*buf == 10) {
+                        if (vfd_cursor < 20)
+                                vfd_cursor = 20;
+                        else if (vfd_cursor < 40)
+                                vfd_cursor = 40;
+                        else if (vfd_cursor < 60)
+                                vfd_cursor = 60;
+                        if (vfd_cursor > 59)
+                                scroll_vfd();
+                } else {
+                        /* just a character */
+                        if (vfd_cursor > 39)
+                                scroll_vfd();
+                        vfd[vfd_cursor++] = *buf;
+                }
+                indx--;
+                buf++;
+        }
+        update_vfd();
+
+        return len;
+}
+
+static struct file_operations briq_panel_fops = {
+        .owner          = THIS_MODULE,
+        .read           = briq_panel_read,
+        .write          = briq_panel_write,
+        .open           = briq_panel_open,
+        .release        = briq_panel_release,
+};
+
+static struct miscdevice briq_panel_miscdev = {
+        BRIQ_PANEL_MINOR,
+        "briq_panel",
+        &briq_panel_fops
+};
+
+static int __init briq_panel_init(void)
+{
+        struct device_node *root = find_path_device("/");
+        char *machine;
+        int i;
+
+        machine = get_property(root, "model", NULL);
+        if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0)
+                return -ENODEV;
+
+        printk(KERN_INFO
+                "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
+                BRIQ_PANEL_VER);
+
+        if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
+                return -EBUSY;
+
+        if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
+                release_region(BRIQ_PANEL_VFD_IOPORT, 4);
+                return -EBUSY;
+        }
+        ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
+
+        if (misc_register(&briq_panel_miscdev) < 0) {
+                release_region(BRIQ_PANEL_VFD_IOPORT, 4);
+                release_region(BRIQ_PANEL_LED_IOPORT, 2);
+                return -EBUSY;
+        }
+
+        outb(0x38, BRIQ_PANEL_VFD_IOPORT);      /* Function set */
+        outb(0x01, BRIQ_PANEL_VFD_IOPORT);      /* Clear display */
+        outb(0x0c, BRIQ_PANEL_VFD_IOPORT);      /* Display on */
+        outb(0x06, BRIQ_PANEL_VFD_IOPORT);      /* Entry normal */
+        for (i=0; i<40; i++)
+                vfd[i]=' ';
+#ifndef MODULE
+        vfd[0] = 'L';
+        vfd[1] = 'o';
+        vfd[2] = 'a';
+        vfd[3] = 'd';
+        vfd[4] = 'i';
+        vfd[5] = 'n';
+        vfd[6] = 'g';
+        vfd[7] = ' ';
+        vfd[8] = '.';
+        vfd[9] = '.';
+        vfd[10] = '.';
+#endif /* !MODULE */
+
+        update_vfd();
+
+        return 0;
+}
+
+static void __exit briq_panel_exit(void)
+{
+        misc_deregister(&briq_panel_miscdev);
+        release_region(BRIQ_PANEL_VFD_IOPORT, 4);
+        release_region(BRIQ_PANEL_LED_IOPORT, 2);
+}
+
+module_init(briq_panel_init);
+module_exit(briq_panel_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
+MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index ca2f538e549e..dbee8bed0530 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -80,7 +80,8 @@ struct hvc_struct {
         struct tty_struct *tty;
         unsigned int count;
         int do_wakeup;
-        char outbuf[N_OUTBUF] __ALIGNED__;
+        char *outbuf;
+        int outbuf_size;
         int n_outbuf;
         uint32_t vtermno;
         struct hv_ops *ops;
@@ -505,7 +506,7 @@ static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count
         if (hp->n_outbuf > 0)
                 hvc_push(hp);
 
-        while (count > 0 && (rsize = N_OUTBUF - hp->n_outbuf) > 0) {
+        while (count > 0 && (rsize = hp->outbuf_size - hp->n_outbuf) > 0) {
                 if (rsize > count)
                         rsize = count;
                 memcpy(hp->outbuf + hp->n_outbuf, buf, rsize);
@@ -538,7 +539,7 @@ static int hvc_write_room(struct tty_struct *tty)
         if (!hp)
                 return -1;
 
-        return N_OUTBUF - hp->n_outbuf;
+        return hp->outbuf_size - hp->n_outbuf;
 }
 
 static int hvc_chars_in_buffer(struct tty_struct *tty)
@@ -728,12 +729,13 @@ static struct kobj_type hvc_kobj_type = {
 };
 
 struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
-                                        struct hv_ops *ops)
+                                        struct hv_ops *ops, int outbuf_size)
 {
         struct hvc_struct *hp;
         int i;
 
-        hp = kmalloc(sizeof(*hp), GFP_KERNEL);
+        hp = kmalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
+                        GFP_KERNEL);
         if (!hp)
                 return ERR_PTR(-ENOMEM);
 
@@ -742,6 +744,8 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
         hp->vtermno = vtermno;
         hp->irq = irq;
         hp->ops = ops;
+        hp->outbuf_size = outbuf_size;
+        hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
 
         kobject_init(&hp->kobj);
         hp->kobj.ktype = &hvc_kobj_type;
diff --git a/drivers/char/hvc_console.h b/drivers/char/hvc_console.h
index 96b7401319c1..8c59818050e6 100644
--- a/drivers/char/hvc_console.h
+++ b/drivers/char/hvc_console.h
@@ -56,7 +56,7 @@ extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
 
 /* register a vterm for hvc tty operation (module_init or hotplug add) */
 extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq,
-                                                 struct hv_ops *ops);
+                                struct hv_ops *ops, int outbuf_size);
 /* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
 extern int __devexit hvc_remove(struct hvc_struct *hp);
 
diff --git a/drivers/char/hvc_iseries.c b/drivers/char/hvc_iseries.c
new file mode 100644
index 000000000000..4747729459c7
--- /dev/null
+++ b/drivers/char/hvc_iseries.c
@@ -0,0 +1,594 @@
+/*
+ * 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/spinlock.h>
+#include <linux/console.h>
+
+#include <asm/hvconsole.h>
+#include <asm/vio.h>
+#include <asm/prom.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)) {
+                spin_lock_irqsave(&consoleloglock, flags);
+                HvCall_writeLogBuffer(buf, count);
+                spin_unlock_irqrestore(&consoleloglock, flags);
+                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)) {
+                        spin_lock_irqsave(&consoleloglock, flags);
+                        HvCall_writeLogBuffer(buf, len);
+                        spin_unlock_irqrestore(&consoleloglock, flags);
+                }
+
+                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 struct hv_ops hvc_get_put_ops = {
+        .get_chars = get_chars,
+        .put_chars = put_chars,
+};
+
+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         = 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 acknowlegement\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 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 hvc_vio_init(void)
+{
+        atomic_t wait_flag;
+        int rc;
+
+        /* +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 hvc_vio_exit(void)
+{
+        vio_unregister_driver(&hvc_vio_driver);
+}
+module_exit(hvc_vio_exit);
+
+/* the device tree order defines our numbering */
+static int 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")) {
+                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))
+                        break;
+
+                vtermno = (uint32_t *)get_property(vty, "reg", NULL);
+                if (!vtermno)
+                        continue;
+
+                if (!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/char/hvc_rtas.c b/drivers/char/hvc_rtas.c
index 57106e02fd2e..4b97eaf18602 100644
--- a/drivers/char/hvc_rtas.c
+++ b/drivers/char/hvc_rtas.c
@@ -94,7 +94,7 @@ static int hvc_rtas_init(void)
 
         /* Allocate an hvc_struct for the console device we instantiated
          * earlier.  Save off hp so that we can return it on exit */
-        hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops);
+        hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops, 16);
         if (IS_ERR(hp))
                 return PTR_ERR(hp);
 
diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c
index 9add81ceb440..cc95941148fb 100644
--- a/drivers/char/hvc_vio.c
+++ b/drivers/char/hvc_vio.c
@@ -90,7 +90,8 @@ static int __devinit hvc_vio_probe(struct vio_dev *vdev,
         if (!vdev || !id)
                 return -EPERM;
 
-        hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops);
+        hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
+                        MAX_VIO_PUT_CHARS);
         if (IS_ERR(hp))
                 return PTR_ERR(hp);
         dev_set_drvdata(&vdev->dev, hp);
@@ -140,7 +141,7 @@ static int hvc_find_vtys(void)
 
         for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
                         vty = of_find_node_by_name(vty, "vty")) {
-                uint32_t *vtermno;
+                const uint32_t *vtermno;
 
                 /* We have statically defined space for only a certain number
                  * of console adapters.
@@ -148,7 +149,7 @@ static int hvc_find_vtys(void)
                 if (num_found >= MAX_NR_HVC_CONSOLES)
                         break;
 
-                vtermno = (uint32_t *)get_property(vty, "reg", NULL);
+                vtermno = get_property(vty, "reg", NULL);
                 if (!vtermno)
                         continue;
 
diff --git a/drivers/char/hvsi.c b/drivers/char/hvsi.c
index 41db8060e8f7..9101784ecf02 100644
--- a/drivers/char/hvsi.c
+++ b/drivers/char/hvsi.c
@@ -1276,11 +1276,10 @@ static int __init hvsi_console_init(void)
                         vty != NULL;
                         vty = of_find_compatible_node(vty, "serial", "hvterm-protocol")) {
                 struct hvsi_struct *hp;
-                uint32_t *vtermno;
-                uint32_t *irq;
+                const uint32_t *vtermno, *irq;
 
-                vtermno = (uint32_t *)get_property(vty, "reg", NULL);
-                irq = (uint32_t *)get_property(vty, "interrupts", NULL);
+                vtermno = get_property(vty, "reg", NULL);
+                irq = get_property(vty, "interrupts", NULL);
                 if (!vtermno || !irq)
                         continue;
 
diff --git a/drivers/char/tpm/tpm_atmel.h b/drivers/char/tpm/tpm_atmel.h
index 2e68eeb8a2cd..aefd683c60b7 100644
--- a/drivers/char/tpm/tpm_atmel.h
+++ b/drivers/char/tpm/tpm_atmel.h
@@ -37,7 +37,7 @@ static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
 {
         struct device_node *dn;
         unsigned long address, size;
-        unsigned int *reg;
+        const unsigned int *reg;
         int reglen;
         int naddrc;
         int nsizec;
@@ -52,7 +52,7 @@ static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
                 return NULL;
         }
 
-        reg = (unsigned int *) get_property(dn, "reg", &reglen);
+        reg = get_property(dn, "reg", &reglen);
         naddrc = prom_n_addr_cells(dn);
         nsizec = prom_n_size_cells(dn);
 
diff --git a/drivers/char/viocons.c b/drivers/char/viocons.c
index 766f7864c6c6..f3efeaf2826e 100644
--- a/drivers/char/viocons.c
+++ b/drivers/char/viocons.c
@@ -43,7 +43,6 @@
 #include <linux/sysrq.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>
@@ -67,35 +66,6 @@ static int vio_sysrq_pressed;
 extern int sysrq_enabled;
 #endif
 
-/*
- * The structure of the events that flow between us and OS/400.  You can't
- * mess with this unless the OS/400 side changes too
- */
-struct viocharlpevent {
-        struct HvLpEvent event;
-        u32 reserved;
-        u16 version;
-        u16 subtype_result_code;
-        u8 virtual_device;
-        u8 len;
-        u8 data[VIOCHAR_MAX_DATA];
-};
-
-#define VIOCHAR_WINDOW          10
-#define VIOCHAR_HIGHWATERMARK   3
-
-enum viocharsubtype {
-        viocharopen = 0x0001,
-        viocharclose = 0x0002,
-        viochardata = 0x0003,
-        viocharack = 0x0004,
-        viocharconfig = 0x0005
-};
-
-enum viochar_rc {
-        viochar_rc_ebusy = 1
-};
-
 #define VIOCHAR_NUM_BUF         16
 
 /*
@@ -1183,6 +1153,7 @@ static int __init viocons_init(void)
                 port_info[i].magic = VIOTTY_MAGIC;
         }
         HvCall_setLogBufferFormatAndCodepage(HvCall_LogBuffer_ASCII, 437);
+        add_preferred_console("viocons", 0, NULL);
         register_console(&viocons_early);
         return 0;
 }
diff --git a/drivers/char/viotape.c b/drivers/char/viotape.c
index b72b2049aaae..73c78bf75d7f 100644
--- a/drivers/char/viotape.c
+++ b/drivers/char/viotape.c
@@ -940,7 +940,6 @@ static void vioHandleTapeEvent(struct HvLpEvent *event)
 
 static int viotape_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 {
-        char tapename[32];
         int i = vdev->unit_address;
         int j;
 
@@ -956,10 +955,9 @@ static int viotape_probe(struct vio_dev *vdev, const struct vio_device_id *id)
                         "iseries!vt%d", i);
         class_device_create(tape_class, NULL, MKDEV(VIOTAPE_MAJOR, i | 0x80),
                         NULL, "iseries!nvt%d", i);
-        sprintf(tapename, "iseries/vt%d", i);
-        printk(VIOTAPE_KERN_INFO "tape %s is iSeries "
+        printk(VIOTAPE_KERN_INFO "tape iseries/vt%d is iSeries "
                         "resource %10.10s type %4.4s, model %3.3s\n",
-                        tapename, viotape_unitinfo[i].rsrcname,
+                        i, viotape_unitinfo[i].rsrcname,
                         viotape_unitinfo[i].type, viotape_unitinfo[i].model);
         return 0;
 }
diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c
index 53bb43593863..d658d9107955 100644
--- a/drivers/i2c/busses/i2c-powermac.c
+++ b/drivers/i2c/busses/i2c-powermac.c
@@ -207,7 +207,8 @@ static int i2c_powermac_probe(struct device *dev)
         struct pmac_i2c_bus *bus = dev->platform_data;
         struct device_node *parent = NULL;
         struct i2c_adapter *adapter;
-        char name[32], *basename;
+        char name[32];
+        const char *basename;
         int rc;
 
         if (bus == NULL)
diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index ebf961f1718d..fa46856e8068 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -1154,7 +1154,7 @@ static int
 pmac_ide_setup_device(pmac_ide_hwif_t *pmif, ide_hwif_t *hwif)
 {
         struct device_node *np = pmif->node;
-        int *bidp;
+        const int *bidp;
 
         pmif->cable_80 = 0;
         pmif->broken_dma = pmif->broken_dma_warn = 0;
@@ -1176,14 +1176,14 @@ pmac_ide_setup_device(pmac_ide_hwif_t *pmif, ide_hwif_t *hwif)
                 pmif->broken_dma = 1;
         }
 
-        bidp = (int *)get_property(np, "AAPL,bus-id", NULL);
+        bidp = get_property(np, "AAPL,bus-id", NULL);
         pmif->aapl_bus_id =  bidp ? *bidp : 0;
 
         /* Get cable type from device-tree */
         if (pmif->kind == controller_kl_ata4 || pmif->kind == controller_un_ata6
             || pmif->kind == controller_k2_ata6
             || pmif->kind == controller_sh_ata6) {
-                char* cable = get_property(np, "cable-type", NULL);
+                const char* cable = get_property(np, "cable-type", NULL);
                 if (cable && !strncmp(cable, "80-", 3))
                         pmif->cable_80 = 1;
         }
diff --git a/drivers/macintosh/macio_asic.c b/drivers/macintosh/macio_asic.c
index 82657bc86d19..d56216067549 100644
--- a/drivers/macintosh/macio_asic.c
+++ b/drivers/macintosh/macio_asic.c
@@ -139,7 +139,9 @@ static int macio_uevent(struct device *dev, char **envp, int num_envp,
 {
         struct macio_dev * macio_dev;
         struct of_device * of;
-        char *scratch, *compat, *compat2;
+        char *scratch;
+        const char *compat, *compat2;
+
         int i = 0;
         int length, cplen, cplen2, seen = 0;
 
@@ -173,7 +175,7 @@ static int macio_uevent(struct device *dev, char **envp, int num_envp,
          * it's not really legal to split it out with commas. We split it
          * up using a number of environment variables instead. */
 
-        compat = (char *) get_property(of->node, "compatible", &cplen);
+        compat = get_property(of->node, "compatible", &cplen);
         compat2 = compat;
         cplen2= cplen;
         while (compat && cplen > 0) {
@@ -454,7 +456,7 @@ static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
                                                struct resource *parent_res)
 {
         struct macio_dev *dev;
-        u32 *reg;
+        const u32 *reg;
         
         if (np == NULL)
                 return NULL;
@@ -489,7 +491,7 @@ static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
 #endif
                         MAX_NODE_NAME_SIZE, np->name);
         } else {
-                reg = (u32 *)get_property(np, "reg", NULL);
+                reg = get_property(np, "reg", NULL);
                 sprintf(dev->ofdev.dev.bus_id, "%1d.%08x:%.*s",
                         chip->lbus.index,
                         reg ? *reg : 0, MAX_NODE_NAME_SIZE, np->name);
diff --git a/drivers/macintosh/macio_sysfs.c b/drivers/macintosh/macio_sysfs.c
index cae24a13526a..8566bdfdd4b8 100644
--- a/drivers/macintosh/macio_sysfs.c
+++ b/drivers/macintosh/macio_sysfs.c
@@ -16,12 +16,12 @@ static ssize_t
 compatible_show (struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct of_device *of;
-        char *compat;
+        const char *compat;
         int cplen;
         int length = 0;
 
         of = &to_macio_device (dev)->ofdev;
-        compat = (char *) get_property(of->node, "compatible", &cplen);
+        compat = get_property(of->node, "compatible", &cplen);
         if (!compat) {
                 *buf = '\0';
                 return 0;
@@ -42,12 +42,12 @@ static ssize_t modalias_show (struct device *dev, struct device_attribute *attr,
                               char *buf)
 {
         struct of_device *of;
-        char *compat;
+        const char *compat;
         int cplen;
         int length;
 
         of = &to_macio_device (dev)->ofdev;
-        compat = (char *) get_property (of->node, "compatible", &cplen);
+        compat = get_property(of->node, "compatible", &cplen);
         if (!compat) compat = "", cplen = 1;
         length = sprintf (buf, "of:N%sT%s", of->node->name, of->node->type);
         buf += length;
diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index 00ef46898147..090e40fc5013 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -454,7 +454,7 @@ EXPORT_SYMBOL(smu_present);
 int __init smu_init (void)
 {
         struct device_node *np;
-        u32 *data;
+        const u32 *data;
 
         np = of_find_node_by_type(NULL, "smu");
         if (np == NULL)
@@ -490,7 +490,7 @@ int __init smu_init (void)
                 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
                 goto fail;
         }
-        data = (u32 *)get_property(smu->db_node, "reg", NULL);
+        data = get_property(smu->db_node, "reg", NULL);
         if (data == NULL) {
                 of_node_put(smu->db_node);
                 smu->db_node = NULL;
@@ -511,7 +511,7 @@ int __init smu_init (void)
                 smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
                 if (smu->msg_node == NULL)
                         break;
-                data = (u32 *)get_property(smu->msg_node, "reg", NULL);
+                data = get_property(smu->msg_node, "reg", NULL);
                 if (data == NULL) {
                         of_node_put(smu->msg_node);
                         smu->msg_node = NULL;
@@ -982,11 +982,11 @@ static struct smu_sdbp_header *smu_create_sdb_partition(int id)
 /* Note: Only allowed to return error code in pointers (using ERR_PTR)
  * when interruptible is 1
  */
-struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size,
-                                                int interruptible)
+const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
+                unsigned int *size, int interruptible)
 {
         char pname[32];
-        struct smu_sdbp_header *part;
+        const struct smu_sdbp_header *part;
 
         if (!smu)
                 return NULL;
@@ -1003,8 +1003,7 @@ struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size,
         } else
                 mutex_lock(&smu_part_access);
 
-        part = (struct smu_sdbp_header *)get_property(smu->of_node,
-                                                      pname, size);
+        part = get_property(smu->of_node, pname, size);
         if (part == NULL) {
                 DPRINTK("trying to extract from SMU ...\n");
                 part = smu_create_sdb_partition(id);
@@ -1015,7 +1014,7 @@ struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size,
         return part;
 }
 
-struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
+const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
 {
         return __smu_get_sdb_partition(id, size, 0);
 }
@@ -1094,7 +1093,7 @@ static ssize_t smu_write(struct file *file, const char __user *buf,
                 pp->mode = smu_file_events;
                 return 0;
         } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
-                struct smu_sdbp_header *part;
+                const struct smu_sdbp_header *part;
                 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
                 if (part == NULL)
                         return -EINVAL;
diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index 7f86478bdd36..a0f30d0853ea 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -47,7 +47,7 @@ static u8 FAN_SPD_SET[2] = {0x30, 0x31};
 
 static u8 default_limits_local[3] = {70, 50, 70};    /* local, sensor1, sensor2 */
 static u8 default_limits_chip[3] = {80, 65, 80};    /* local, sensor1, sensor2 */
-static char *sensor_location[3] = {NULL, NULL, NULL};
+static const char *sensor_location[3] = {NULL, NULL, NULL};
 
 static int limit_adjust = 0;
 static int fan_speed = -1;
@@ -553,7 +553,7 @@ static int __init
 thermostat_init(void)
 {
         struct device_node* np;
-        u32 *prop;
+        const u32 *prop;
         int i = 0, offset = 0;
         
         np = of_find_node_by_name(NULL, "fan");
@@ -566,13 +566,13 @@ thermostat_init(void)
         else
                 return -ENODEV;
 
-        prop = (u32 *)get_property(np, "hwsensor-params-version", NULL);
+        prop = get_property(np, "hwsensor-params-version", NULL);
         printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
                          (*prop == 1)?"":"un");
         if (*prop != 1)
                 return -ENODEV;
 
-        prop = (u32 *)get_property(np, "reg", NULL);
+        prop = get_property(np, "reg", NULL);
         if (!prop)
                 return -ENODEV;
 
diff --git a/drivers/macintosh/therm_pm72.c b/drivers/macintosh/therm_pm72.c
index 20bf67244e2c..d00c0c37a12e 100644
--- a/drivers/macintosh/therm_pm72.c
+++ b/drivers/macintosh/therm_pm72.c
@@ -660,7 +660,7 @@ static int read_eeprom(int cpu, struct mpu_data *out)
 {
         struct device_node *np;
         char nodename[64];
-        u8 *data;
+        const u8 *data;
         int len;
 
         /* prom.c routine for finding a node by path is a bit brain dead
@@ -673,7 +673,7 @@ static int read_eeprom(int cpu, struct mpu_data *out)
                 printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid node from device-tree\n");
                 return -ENODEV;
         }
-        data = (u8 *)get_property(np, "cpuid", &len);
+        data = get_property(np, "cpuid", &len);
         if (data == NULL) {
                 printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid property from device-tree\n");
                 of_node_put(np);
@@ -1336,7 +1336,7 @@ static int init_backside_state(struct backside_pid_state *state)
          */
         u3 = of_find_node_by_path("/u3@0,f8000000");
         if (u3 != NULL) {
-                u32 *vers = (u32 *)get_property(u3, "device-rev", NULL);
+                const u32 *vers = get_property(u3, "device-rev", NULL);
                 if (vers)
                         if (((*vers) & 0x3f) < 0x34)
                                 u3h = 0;
@@ -2111,8 +2111,8 @@ static void fcu_lookup_fans(struct device_node *fcu_node)
 
         while ((np = of_get_next_child(fcu_node, np)) != NULL) {
                 int type = -1;
-                char *loc;
-                u32 *reg;
+                const char *loc;
+                const u32 *reg;
 
                 DBG(" control: %s, type: %s\n", np->name, np->type);
 
@@ -2128,8 +2128,8 @@ static void fcu_lookup_fans(struct device_node *fcu_node)
                         continue;
 
                 /* Lookup for a matching location */
-                loc = (char *)get_property(np, "location", NULL);
-                reg = (u32 *)get_property(np, "reg", NULL);
+                loc = get_property(np, "location", NULL);
+                reg = get_property(np, "reg", NULL);
                 if (loc == NULL || reg == NULL)
                         continue;
                 DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg);
diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c
index c7d1c290cb0c..738faab1b22c 100644
--- a/drivers/macintosh/therm_windtunnel.c
+++ b/drivers/macintosh/therm_windtunnel.c
@@ -484,14 +484,14 @@ struct apple_thermal_info {
 static int __init
 g4fan_init( void )
 {
-        struct apple_thermal_info *info;
+        const struct apple_thermal_info *info;
         struct device_node *np;
 
         init_MUTEX( &x.lock );
 
         if( !(np=of_find_node_by_name(NULL, "power-mgt")) )
                 return -ENODEV;
-        info = (struct apple_thermal_info*)get_property(np, "thermal-info", NULL);
+        info = get_property(np, "thermal-info", NULL);
         of_node_put(np);
 
         if( !info || !machine_is_compatible("PowerMac3,6") )
diff --git a/drivers/macintosh/via-cuda.c b/drivers/macintosh/via-cuda.c
index 69d5452fd22f..7512d1c15207 100644
--- a/drivers/macintosh/via-cuda.c
+++ b/drivers/macintosh/via-cuda.c
@@ -123,7 +123,7 @@ int __init find_via_cuda(void)
 {
     struct adb_request req;
     phys_addr_t taddr;
-    u32 *reg;
+    const u32 *reg;
     int err;
 
     if (vias != 0)
@@ -132,7 +132,7 @@ int __init find_via_cuda(void)
     if (vias == 0)
         return 0;
 
-    reg = (u32 *)get_property(vias, "reg", NULL);
+    reg = get_property(vias, "reg", NULL);
     if (reg == NULL) {
             printk(KERN_ERR "via-cuda: No \"reg\" property !\n");
             goto fail;
diff --git a/drivers/macintosh/via-pmu-led.c b/drivers/macintosh/via-pmu-led.c
index 5189d5454b1f..179af10105d9 100644
--- a/drivers/macintosh/via-pmu-led.c
+++ b/drivers/macintosh/via-pmu-led.c
@@ -120,7 +120,7 @@ static int __init via_pmu_led_init(void)
         dt = of_find_node_by_path("/");
         if (dt == NULL)
                 return -ENODEV;
-        model = (const char *)get_property(dt, "model", NULL);
+        model = get_property(dt, "model", NULL);
         if (model == NULL)
                 return -ENODEV;
         if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index ea386801e215..0df500b9a66b 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -280,7 +280,7 @@ static char *pbook_type[] = {
 int __init find_via_pmu(void)
 {
         u64 taddr;
-        u32 *reg;
+        const u32 *reg;
 
         if (via != 0)
                 return 1;
@@ -288,7 +288,7 @@ int __init find_via_pmu(void)
         if (vias == NULL)
                 return 0;
 
-        reg = (u32 *)get_property(vias, "reg", NULL);
+        reg = get_property(vias, "reg", NULL);
         if (reg == NULL) {
                 printk(KERN_ERR "via-pmu: No \"reg\" property !\n");
                 goto fail;
@@ -330,7 +330,7 @@ int __init find_via_pmu(void)
                 
                 gpiop = of_find_node_by_name(NULL, "gpio");
                 if (gpiop) {
-                        reg = (u32 *)get_property(gpiop, "reg", NULL);
+                        reg = get_property(gpiop, "reg", NULL);
                         if (reg)
                                 gaddr = of_translate_address(gpiop, reg);
                         if (gaddr != OF_BAD_ADDR)
@@ -479,9 +479,9 @@ static int __init via_pmu_dev_init(void)
                 pmu_batteries[1].flags |= PMU_BATT_TYPE_SMART;
         } else {
                 struct device_node* prim = find_devices("power-mgt");
-                u32 *prim_info = NULL;
+                const u32 *prim_info = NULL;
                 if (prim)
-                        prim_info = (u32 *)get_property(prim, "prim-info", NULL);
+                        prim_info = get_property(prim, "prim-info", NULL);
                 if (prim_info) {
                         /* Other stuffs here yet unknown */
                         pmu_battery_count = (prim_info[6] >> 16) & 0xff;
diff --git a/drivers/macintosh/windfarm_pm81.c b/drivers/macintosh/windfarm_pm81.c
index f1df6efcbe68..2ff546e4c92f 100644
--- a/drivers/macintosh/windfarm_pm81.c
+++ b/drivers/macintosh/windfarm_pm81.c
@@ -396,7 +396,7 @@ static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
 static void wf_smu_create_cpu_fans(void)
 {
         struct wf_cpu_pid_param pid_param;
-        struct smu_sdbp_header *hdr;
+        const struct smu_sdbp_header *hdr;
         struct smu_sdbp_cpupiddata *piddata;
         struct smu_sdbp_fvt *fvt;
         s32 tmax, tdelta, maxpow, powadj;
@@ -702,7 +702,7 @@ static struct notifier_block wf_smu_events = {
 
 static int wf_init_pm(void)
 {
-        struct smu_sdbp_header *hdr;
+        const struct smu_sdbp_header *hdr;
 
         hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
         if (hdr != 0) {
diff --git a/drivers/macintosh/windfarm_pm91.c b/drivers/macintosh/windfarm_pm91.c
index 0d6372e96d32..59e9ffe37c39 100644
--- a/drivers/macintosh/windfarm_pm91.c
+++ b/drivers/macintosh/windfarm_pm91.c
@@ -144,7 +144,7 @@ static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
 static void wf_smu_create_cpu_fans(void)
 {
         struct wf_cpu_pid_param pid_param;
-        struct smu_sdbp_header *hdr;
+        const struct smu_sdbp_header *hdr;
         struct smu_sdbp_cpupiddata *piddata;
         struct smu_sdbp_fvt *fvt;
         s32 tmax, tdelta, maxpow, powadj;
diff --git a/drivers/macintosh/windfarm_smu_controls.c b/drivers/macintosh/windfarm_smu_controls.c
index a9e88edc0c72..bff1f372f188 100644
--- a/drivers/macintosh/windfarm_smu_controls.c
+++ b/drivers/macintosh/windfarm_smu_controls.c
@@ -159,14 +159,15 @@ static struct smu_fan_control *smu_fan_create(struct device_node *node,
                                               int pwm_fan)
 {
         struct smu_fan_control *fct;
-        s32 *v; u32 *reg;
-        char *l;
+        const s32 *v;
+        const u32 *reg;
+        const char *l;
 
         fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
         if (fct == NULL)
                 return NULL;
         fct->ctrl.ops = &smu_fan_ops;
-        l = (char *)get_property(node, "location", NULL);
+        l = get_property(node, "location", NULL);
         if (l == NULL)
                 goto fail;
 
@@ -223,17 +224,17 @@ static struct smu_fan_control *smu_fan_create(struct device_node *node,
                 goto fail;
 
         /* Get min & max values*/
-        v = (s32 *)get_property(node, "min-value", NULL);
+        v = get_property(node, "min-value", NULL);
         if (v == NULL)
                 goto fail;
         fct->min = *v;
-        v = (s32 *)get_property(node, "max-value", NULL);
+        v = get_property(node, "max-value", NULL);
         if (v == NULL)
                 goto fail;
         fct->max = *v;
 
         /* Get "reg" value */
-        reg = (u32 *)get_property(node, "reg", NULL);
+        reg = get_property(node, "reg", NULL);
         if (reg == NULL)
                 goto fail;
         fct->reg = *reg;
diff --git a/drivers/macintosh/windfarm_smu_sat.c b/drivers/macintosh/windfarm_smu_sat.c
index e295a07a1ebc..aceb61d9fbc8 100644
--- a/drivers/macintosh/windfarm_smu_sat.c
+++ b/drivers/macintosh/windfarm_smu_sat.c
@@ -233,15 +233,15 @@ static void wf_sat_create(struct i2c_adapter *adapter, struct device_node *dev)
 {
         struct wf_sat *sat;
         struct wf_sat_sensor *sens;
-        u32 *reg;
-        char *loc, *type;
+        const u32 *reg;
+        const char *loc, *type;
         u8 addr, chip, core;
         struct device_node *child;
         int shift, cpu, index;
         char *name;
         int vsens[2], isens[2];
 
-        reg = (u32 *) get_property(dev, "reg", NULL);
+        reg = get_property(dev, "reg", NULL);
         if (reg == NULL)
                 return;
         addr = *reg;
@@ -268,7 +268,7 @@ static void wf_sat_create(struct i2c_adapter *adapter, struct device_node *dev)
         isens[0] = isens[1] = -1;
         child = NULL;
         while ((child = of_get_next_child(dev, child)) != NULL) {
-                reg = (u32 *) get_property(child, "reg", NULL);
+                reg = get_property(child, "reg", NULL);
                 type = get_property(child, "device_type", NULL);
                 loc = get_property(child, "location", NULL);
                 if (reg == NULL || loc == NULL)
diff --git a/drivers/macintosh/windfarm_smu_sensors.c b/drivers/macintosh/windfarm_smu_sensors.c
index bed25dcf8a1e..defe9922ebd1 100644
--- a/drivers/macintosh/windfarm_smu_sensors.c
+++ b/drivers/macintosh/windfarm_smu_sensors.c
@@ -198,14 +198,14 @@ static struct wf_sensor_ops smu_slotspow_ops = {
 static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
 {
         struct smu_ad_sensor *ads;
-        char *c, *l;
-        u32 *v;
+        const char *c, *l;
+        const u32 *v;
 
         ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
         if (ads == NULL)
                 return NULL;
-        c = (char *)get_property(node, "device_type", NULL);
-        l = (char *)get_property(node, "location", NULL);
+        c = get_property(node, "device_type", NULL);
+        l = get_property(node, "location", NULL);
         if (c == NULL || l == NULL)
                 goto fail;
 
@@ -255,7 +255,7 @@ static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
         } else
                 goto fail;
 
-        v = (u32 *)get_property(node, "reg", NULL);
+        v = get_property(node, "reg", NULL);
         if (v == NULL)
                 goto fail;
         ads->reg = *v;
@@ -382,7 +382,7 @@ smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
 
 static void smu_fetch_param_partitions(void)
 {
-        struct smu_sdbp_header *hdr;
+        const struct smu_sdbp_header *hdr;
 
         /* Get CPU voltage/current/power calibration data */
         hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
diff --git a/drivers/net/bmac.c b/drivers/net/bmac.c
index 6fad83f24c4f..711609665632 100644
--- a/drivers/net/bmac.c
+++ b/drivers/net/bmac.c
@@ -1264,7 +1264,8 @@ static int __devinit bmac_probe(struct macio_dev *mdev, const struct of_device_i
 {
         int j, rev, ret;
         struct bmac_data *bp;
-        unsigned char *addr;
+        const unsigned char *prop_addr;
+        unsigned char addr[6];
         struct net_device *dev;
         int is_bmac_plus = ((int)match->data) != 0;
 
@@ -1272,14 +1273,16 @@ static int __devinit bmac_probe(struct macio_dev *mdev, const struct of_device_i
                 printk(KERN_ERR "BMAC: can't use, need 3 addrs and 3 intrs\n");
                 return -ENODEV;
         }
-        addr = get_property(macio_get_of_node(mdev), "mac-address", NULL);
-        if (addr == NULL) {
-                addr = get_property(macio_get_of_node(mdev), "local-mac-address", NULL);
-                if (addr == NULL) {
+        prop_addr = get_property(macio_get_of_node(mdev), "mac-address", NULL);
+        if (prop_addr == NULL) {
+                prop_addr = get_property(macio_get_of_node(mdev),
+                                "local-mac-address", NULL);
+                if (prop_addr == NULL) {
                         printk(KERN_ERR "BMAC: Can't get mac-address\n");
                         return -ENODEV;
                 }
         }
+        memcpy(addr, prop_addr, sizeof(addr));
 
         dev = alloc_etherdev(PRIV_BYTES);
         if (!dev) {
diff --git a/drivers/net/ibmveth.h b/drivers/net/ibmveth.h
index 8385bf836507..149191cef2f0 100644
--- a/drivers/net/ibmveth.h
+++ b/drivers/net/ibmveth.h
@@ -41,16 +41,6 @@
 #define IbmVethMcastRemoveFilter     0x2UL
 #define IbmVethMcastClearFilterTable 0x3UL
 
-/* hcall numbers */
-#define H_VIO_SIGNAL             0x104
-#define H_REGISTER_LOGICAL_LAN   0x114
-#define H_FREE_LOGICAL_LAN       0x118
-#define H_ADD_LOGICAL_LAN_BUFFER 0x11C
-#define H_SEND_LOGICAL_LAN       0x120
-#define H_MULTICAST_CTRL         0x130
-#define H_CHANGE_LOGICAL_LAN_MAC 0x14C
-#define H_FREE_LOGICAL_LAN_BUFFER 0x1D4
-
 /* hcall macros */
 #define h_register_logical_lan(ua, buflst, rxq, fltlst, mac) \
   plpar_hcall_norets(H_REGISTER_LOGICAL_LAN, ua, buflst, rxq, fltlst, mac)
diff --git a/drivers/net/mace.c b/drivers/net/mace.c
index 29e4b5aa6ead..5d80e0e6a8e9 100644
--- a/drivers/net/mace.c
+++ b/drivers/net/mace.c
@@ -113,7 +113,7 @@ static int __devinit mace_probe(struct macio_dev *mdev, const struct of_device_i
         struct device_node *mace = macio_get_of_node(mdev);
         struct net_device *dev;
         struct mace_data *mp;
-        unsigned char *addr;
+        const unsigned char *addr;
         int j, rev, rc = -EBUSY;
 
         if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) {
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index 647f62e9707d..ec1a8e2d458e 100644
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -1698,10 +1698,10 @@ spider_net_setup_phy(struct spider_net_card *card)
  */
 static int
 spider_net_download_firmware(struct spider_net_card *card,
-                             u8 *firmware_ptr)
+                             const void *firmware_ptr)
 {
         int sequencer, i;
-        u32 *fw_ptr = (u32 *)firmware_ptr;
+        const u32 *fw_ptr = firmware_ptr;
 
         /* stop sequencers */
         spider_net_write_reg(card, SPIDER_NET_GSINIT,
@@ -1758,7 +1758,7 @@ spider_net_init_firmware(struct spider_net_card *card)
 {
         struct firmware *firmware = NULL;
         struct device_node *dn;
-        u8 *fw_prop = NULL;
+        const u8 *fw_prop = NULL;
         int err = -ENOENT;
         int fw_size;
 
@@ -1784,7 +1784,7 @@ try_host_fw:
         if (!dn)
                 goto out_err;
 
-        fw_prop = (u8 *)get_property(dn, "firmware", &fw_size);
+        fw_prop = get_property(dn, "firmware", &fw_size);
         if (!fw_prop)
                 goto out_err;
 
@@ -1987,7 +1987,7 @@ spider_net_setup_netdev(struct spider_net_card *card)
         struct net_device *netdev = card->netdev;
         struct device_node *dn;
         struct sockaddr addr;
-        u8 *mac;
+        const u8 *mac;
 
         SET_MODULE_OWNER(netdev);
         SET_NETDEV_DEV(netdev, &card->pdev->dev);
@@ -2017,7 +2017,7 @@ spider_net_setup_netdev(struct spider_net_card *card)
         if (!dn)
                 return -EIO;
 
-        mac = (u8 *)get_property(dn, "local-mac-address", NULL);
+        mac = get_property(dn, "local-mac-address", NULL);
         if (!mac)
                 return -EIO;
         memcpy(addr.sa_data, mac, ETH_ALEN);
diff --git a/drivers/net/sungem.c b/drivers/net/sungem.c
index b70bbd748978..d7b1d1882cab 100644
--- a/drivers/net/sungem.c
+++ b/drivers/net/sungem.c
@@ -2896,7 +2896,7 @@ static int __devinit gem_get_device_address(struct gem *gp)
         if (use_idprom)
                 memcpy(dev->dev_addr, idprom->id_ethaddr, 6);
 #elif defined(CONFIG_PPC_PMAC)
-        unsigned char *addr;
+        const unsigned char *addr;
 
         addr = get_property(gp->of_node, "local-mac-address", NULL);
         if (addr == NULL) {
diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index 076bd6dcafae..7288a3eccfb3 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -176,16 +176,16 @@ static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_spe
         return 0;
 }
 
-static int get_children_props(struct device_node *dn, int **drc_indexes,
-                int **drc_names, int **drc_types, int **drc_power_domains)
+static int get_children_props(struct device_node *dn, const int **drc_indexes,
+                const int **drc_names, const int **drc_types,
+                const int **drc_power_domains)
 {
-        int *indexes, *names;
-        int *types, *domains;
+        const int *indexes, *names, *types, *domains;
 
-        indexes = (int *) get_property(dn, "ibm,drc-indexes", NULL);
-        names = (int *) get_property(dn, "ibm,drc-names", NULL);
-        types = (int *) get_property(dn, "ibm,drc-types", NULL);
-        domains = (int *) get_property(dn, "ibm,drc-power-domains", NULL);
+        indexes = get_property(dn, "ibm,drc-indexes", NULL);
+        names = get_property(dn, "ibm,drc-names", NULL);
+        types = get_property(dn, "ibm,drc-types", NULL);
+        domains = get_property(dn, "ibm,drc-power-domains", NULL);
 
         if (!indexes || !names || !types || !domains) {
                 /* Slot does not have dynamically-removable children */
@@ -212,13 +212,13 @@ static int get_children_props(struct device_node *dn, int **drc_indexes,
 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
                 char **drc_name, char **drc_type, int *drc_power_domain)
 {
-        int *indexes, *names;
-        int *types, *domains;
-        unsigned int *my_index;
+        const int *indexes, *names;
+        const int *types, *domains;
+        const unsigned int *my_index;
         char *name_tmp, *type_tmp;
         int i, rc;
 
-        my_index = (int *) get_property(dn, "ibm,my-drc-index", NULL);
+        my_index = get_property(dn, "ibm,my-drc-index", NULL);
         if (!my_index) {
                 /* Node isn't DLPAR/hotplug capable */
                 return -EINVAL;
@@ -265,10 +265,10 @@ static int is_php_type(char *drc_type)
         return 1;
 }
 
-static int is_php_dn(struct device_node *dn, int **indexes, int **names,
-                int **types, int **power_domains)
+static int is_php_dn(struct device_node *dn, const int **indexes,
+                const int **names, const int **types, const int **power_domains)
 {
-        int *drc_types;
+        const int *drc_types;
         int rc;
 
         rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
@@ -296,7 +296,7 @@ int rpaphp_add_slot(struct device_node *dn)
         struct slot *slot;
         int retval = 0;
         int i;
-        int *indexes, *names, *types, *power_domains;
+        const int *indexes, *names, *types, *power_domains;
         char *name, *type;
 
         dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
diff --git a/drivers/scsi/ibmvscsi/rpa_vscsi.c b/drivers/scsi/ibmvscsi/rpa_vscsi.c
index ed22b96580c6..01b8ac641eb8 100644
--- a/drivers/scsi/ibmvscsi/rpa_vscsi.c
+++ b/drivers/scsi/ibmvscsi/rpa_vscsi.c
@@ -156,8 +156,8 @@ static void gather_partition_info(void)
 {
         struct device_node *rootdn;
 
-        char *ppartition_name;
-        unsigned int *p_number_ptr;
+        const char *ppartition_name;
+        const unsigned int *p_number_ptr;
 
         /* Retrieve information about this partition */
         rootdn = find_path_device("/");
@@ -165,14 +165,11 @@ static void gather_partition_info(void)
                 return;
         }
 
-        ppartition_name =
-                get_property(rootdn, "ibm,partition-name", NULL);
+        ppartition_name = get_property(rootdn, "ibm,partition-name", NULL);
         if (ppartition_name)
                 strncpy(partition_name, ppartition_name,
                                 sizeof(partition_name));
-        p_number_ptr =
-                (unsigned int *)get_property(rootdn, "ibm,partition-no",
-                                             NULL);
+        p_number_ptr = get_property(rootdn, "ibm,partition-no", NULL);
         if (p_number_ptr)
                 partition_number = *p_number_ptr;
 }
diff --git a/drivers/scsi/mac53c94.c b/drivers/scsi/mac53c94.c
index 89ef34df5a1d..6422de72bf43 100644
--- a/drivers/scsi/mac53c94.c
+++ b/drivers/scsi/mac53c94.c
@@ -431,7 +431,7 @@ static int mac53c94_probe(struct macio_dev *mdev, const struct of_device_id *mat
         struct fsc_state *state;
         struct Scsi_Host *host;
         void *dma_cmd_space;
-        unsigned char *clkprop;
+        const unsigned char *clkprop;
         int proplen, rc = -ENODEV;
 
         if (macio_resource_count(mdev) != 2 || macio_irq_count(mdev) != 2) {
diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index 5572981a9f92..592b52afe658 100644
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -1850,7 +1850,8 @@ static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match)
 {
         struct device_node *mesh = macio_get_of_node(mdev);
         struct pci_dev* pdev = macio_get_pci_dev(mdev);
-        int tgt, *cfp, minper;
+        int tgt, minper;
+        const int *cfp;
         struct mesh_state *ms;
         struct Scsi_Host *mesh_host;
         void *dma_cmd_space;
@@ -1939,7 +1940,7 @@ static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match)
                 ms->tgts[tgt].current_req = NULL;
         }
 
-        if ((cfp = (int *) get_property(mesh, "clock-frequency", NULL)))
+        if ((cfp = get_property(mesh, "clock-frequency", NULL)))
                 ms->clk_freq = *cfp;
         else {
                 printk(KERN_INFO "mesh: assuming 50MHz clock frequency\n");
diff --git a/drivers/scsi/sata_svw.c b/drivers/scsi/sata_svw.c
index 7d0858095e1f..6b70c3c76dfd 100644
--- a/drivers/scsi/sata_svw.c
+++ b/drivers/scsi/sata_svw.c
@@ -268,7 +268,7 @@ static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
         /* Match it to a port node */
         index = (ap == ap->host_set->ports[0]) ? 0 : 1;
         for (np = np->child; np != NULL; np = np->sibling) {
-                u32 *reg = (u32 *)get_property(np, "reg", NULL);
+                const u32 *reg = get_property(np, "reg", NULL);
                 if (!reg)
                         continue;
                 if (index == *reg)
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c
index bfd2a22759eb..a3b99caf80e6 100644
--- a/drivers/serial/pmac_zilog.c
+++ b/drivers/serial/pmac_zilog.c
@@ -1400,8 +1400,8 @@ static struct uart_ops pmz_pops = {
 static int __init pmz_init_port(struct uart_pmac_port *uap)
 {
         struct device_node *np = uap->node;
-        char *conn;
-        struct slot_names_prop {
+        const char *conn;
+        const struct slot_names_prop {
                 int     count;
                 char    name[1];
         } *slots;
@@ -1458,7 +1458,7 @@ no_dma:
                 uap->flags |= PMACZILOG_FLAG_IS_IRDA;
         uap->port_type = PMAC_SCC_ASYNC;
         /* 1999 Powerbook G3 has slot-names property instead */
-        slots = (struct slot_names_prop *)get_property(np, "slot-names", &len);
+        slots = get_property(np, "slot-names", &len);
         if (slots && slots->count > 0) {
                 if (strcmp(slots->name, "IrDA") == 0)
                         uap->flags |= PMACZILOG_FLAG_IS_IRDA;
@@ -1470,7 +1470,8 @@ no_dma:
         if (ZS_IS_INTMODEM(uap)) {
                 struct device_node* i2c_modem = find_devices("i2c-modem");
                 if (i2c_modem) {
-                        char* mid = get_property(i2c_modem, "modem-id", NULL);
+                        const char* mid =
+                                get_property(i2c_modem, "modem-id", NULL);
                         if (mid) switch(*mid) {
                         case 0x04 :
                         case 0x05 :
diff --git a/drivers/video/S3triofb.c b/drivers/video/S3triofb.c
index afd146f5f683..397005eb392d 100644
--- a/drivers/video/S3triofb.c
+++ b/drivers/video/S3triofb.c
@@ -349,30 +349,30 @@ static void __init s3triofb_of_init(struct device_node *dp)
     s3trio_name[sizeof(s3trio_name)-1] = '\0';
     strcpy(fb_fix.id, s3trio_name);
 
-    if((pp = (int *)get_property(dp, "vendor-id", &len)) != NULL
+    if((pp = get_property(dp, "vendor-id", &len)) != NULL
         && *pp!=PCI_VENDOR_ID_S3) {
         printk("%s: can't find S3 Trio board\n", dp->full_name);
         return;
     }
 
-    if((pp = (int *)get_property(dp, "device-id", &len)) != NULL
+    if((pp = get_property(dp, "device-id", &len)) != NULL
         && *pp!=PCI_DEVICE_ID_S3_TRIO) {
         printk("%s: can't find S3 Trio board\n", dp->full_name);
         return;
     }
 
-    if ((pp = (int *)get_property(dp, "depth", &len)) != NULL
+    if ((pp = get_property(dp, "depth", &len)) != NULL
         && len == sizeof(int) && *pp != 8) {
         printk("%s: can't use depth = %d\n", dp->full_name, *pp);
         return;
     }
-    if ((pp = (int *)get_property(dp, "width", &len)) != NULL
+    if ((pp = get_property(dp, "width", &len)) != NULL
         && len == sizeof(int))
         fb_var.xres = fb_var.xres_virtual = *pp;
-    if ((pp = (int *)get_property(dp, "height", &len)) != NULL
+    if ((pp = get_property(dp, "height", &len)) != NULL
         && len == sizeof(int))
         fb_var.yres = fb_var.yres_virtual = *pp;
-    if ((pp = (int *)get_property(dp, "linebytes", &len)) != NULL
+    if ((pp = get_property(dp, "linebytes", &len)) != NULL
         && len == sizeof(int))
         fb_fix.line_length = *pp;
     else
diff --git a/drivers/video/aty/radeon_base.c b/drivers/video/aty/radeon_base.c
index 8e3400d5dd21..0ed577e7cc21 100644
--- a/drivers/video/aty/radeon_base.c
+++ b/drivers/video/aty/radeon_base.c
@@ -413,11 +413,11 @@ static int  __devinit radeon_find_mem_vbios(struct radeonfb_info *rinfo)
 static int __devinit radeon_read_xtal_OF (struct radeonfb_info *rinfo)
 {
         struct device_node *dp = rinfo->of_node;
-        u32 *val;
+        const u32 *val;
 
         if (dp == NULL)
                 return -ENODEV;
-        val = (u32 *) get_property(dp, "ATY,RefCLK", NULL);
+        val = get_property(dp, "ATY,RefCLK", NULL);
         if (!val || !*val) {
                 printk(KERN_WARNING "radeonfb: No ATY,RefCLK property !\n");
                 return -EINVAL;
@@ -425,11 +425,11 @@ static int __devinit radeon_read_xtal_OF (struct radeonfb_info *rinfo)
 
         rinfo->pll.ref_clk = (*val) / 10;
 
-        val = (u32 *) get_property(dp, "ATY,SCLK", NULL);
+        val = get_property(dp, "ATY,SCLK", NULL);
         if (val && *val)
                 rinfo->pll.sclk = (*val) / 10;
 
-        val = (u32 *) get_property(dp, "ATY,MCLK", NULL);
+        val = get_property(dp, "ATY,MCLK", NULL);
         if (val && *val)
                 rinfo->pll.mclk = (*val) / 10;
 
diff --git a/drivers/video/aty/radeon_monitor.c b/drivers/video/aty/radeon_monitor.c
index 98c05bc0de44..ea531a6f45d1 100644
--- a/drivers/video/aty/radeon_monitor.c
+++ b/drivers/video/aty/radeon_monitor.c
@@ -64,13 +64,13 @@ static int __devinit radeon_parse_montype_prop(struct device_node *dp, u8 **out_
 {
         static char *propnames[] = { "DFP,EDID", "LCD,EDID", "EDID",
                                      "EDID1", "EDID2",  NULL };
-        u8 *pedid = NULL;
-        u8 *pmt = NULL;
+        const u8 *pedid = NULL;
+        const u8 *pmt = NULL;
         u8 *tmp;
         int i, mt = MT_NONE;  
         
         RTRACE("analyzing OF properties...\n");
-        pmt = (u8 *)get_property(dp, "display-type", NULL);
+        pmt = get_property(dp, "display-type", NULL);
         if (!pmt)
                 return MT_NONE;
         RTRACE("display-type: %s\n", pmt);
@@ -89,7 +89,7 @@ static int __devinit radeon_parse_montype_prop(struct device_node *dp, u8 **out_
         }
 
         for (i = 0; propnames[i] != NULL; ++i) {
-                pedid = (u8 *)get_property(dp, propnames[i], NULL);
+                pedid = get_property(dp, propnames[i], NULL);
                 if (pedid != NULL)
                         break;
         }
@@ -124,14 +124,14 @@ static int __devinit radeon_probe_OF_head(struct radeonfb_info *rinfo, int head_
                 return MT_NONE;
 
         if (rinfo->has_CRTC2) {
-                char *pname;
+                const char *pname;
                 int len, second = 0;
 
                 dp = dp->child;
                 do {
                         if (!dp)
                                 return MT_NONE;
-                        pname = (char *)get_property(dp, "name", NULL);
+                        pname = get_property(dp, "name", NULL);
                         if (!pname)
                                 return MT_NONE;
                         len = strlen(pname);
diff --git a/drivers/video/aty/radeon_pm.c b/drivers/video/aty/radeon_pm.c
index f31e606a2ded..e308ed2d249a 100644
--- a/drivers/video/aty/radeon_pm.c
+++ b/drivers/video/aty/radeon_pm.c
@@ -1268,7 +1268,7 @@ static void radeon_pm_full_reset_sdram(struct radeonfb_info *rinfo)
                           0x21320032, 0xa1320032, 0x21320032, 0xffffffff,
                           0x31320032 };
 
-                u32 *mrtable = default_mrtable;
+                const u32 *mrtable = default_mrtable;
                 int i, mrtable_size = ARRAY_SIZE(default_mrtable);
 
                 mdelay(30);
@@ -1287,7 +1287,7 @@ static void radeon_pm_full_reset_sdram(struct radeonfb_info *rinfo)
                 if (rinfo->of_node != NULL) {
                         int size;
 
-                        mrtable = (u32 *)get_property(rinfo->of_node, "ATY,MRT", &size);
+                        mrtable = get_property(rinfo->of_node, "ATY,MRT", &size);
                         if (mrtable)
                                 mrtable_size = size >> 2;
                         else
diff --git a/drivers/video/nvidia/nv_of.c b/drivers/video/nvidia/nv_of.c
index 8209106e26ee..d9af88c2b580 100644
--- a/drivers/video/nvidia/nv_of.c
+++ b/drivers/video/nvidia/nv_of.c
@@ -32,7 +32,7 @@ int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
 {
         struct nvidia_par *par = info->par;
         struct device_node *parent, *dp;
-        unsigned char *pedid = NULL;
+        const unsigned char *pedid = NULL;
         static char *propnames[] = {
                 "DFP,EDID", "LCD,EDID", "EDID", "EDID1",
                 "EDID,B", "EDID,A", NULL };
@@ -42,20 +42,19 @@ int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
         if (parent == NULL)
                 return -1;
         if (par->twoHeads) {
-                char *pname;
+                const char *pname;
                 int len;
 
                 for (dp = NULL;
                      (dp = of_get_next_child(parent, dp)) != NULL;) {
-                        pname = (char *)get_property(dp, "name", NULL);
+                        pname = get_property(dp, "name", NULL);
                         if (!pname)
                                 continue;
                         len = strlen(pname);
                         if ((pname[len-1] == 'A' && conn == 1) ||
                             (pname[len-1] == 'B' && conn == 2)) {
                                 for (i = 0; propnames[i] != NULL; ++i) {
-                                        pedid = (unsigned char *)
-                                                get_property(dp, propnames[i],
+                                        pedid = get_property(dp, propnames[i],
                                                              NULL);
                                         if (pedid != NULL)
                                                 break;
@@ -67,8 +66,7 @@ int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
         }
         if (pedid == NULL) {
                 for (i = 0; propnames[i] != NULL; ++i) {
-                        pedid = (unsigned char *)
-                                get_property(parent, propnames[i], NULL);
+                        pedid = get_property(parent, propnames[i], NULL);
                         if (pedid != NULL)
                                 break;
                 }
diff --git a/drivers/video/offb.c b/drivers/video/offb.c
index 0013311e0564..bad0e98fb3b6 100644
--- a/drivers/video/offb.c
+++ b/drivers/video/offb.c
@@ -409,30 +409,30 @@ static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
         unsigned int flags, rsize, addr_prop = 0;
         unsigned long max_size = 0;
         u64 rstart, address = OF_BAD_ADDR;
-        u32 *pp, *addrp, *up;
+        const u32 *pp, *addrp, *up;
         u64 asize;
 
-        pp = (u32 *)get_property(dp, "linux,bootx-depth", &len);
+        pp = get_property(dp, "linux,bootx-depth", &len);
         if (pp == NULL)
-                pp = (u32 *)get_property(dp, "depth", &len);
+                pp = get_property(dp, "depth", &len);
         if (pp && len == sizeof(u32))
                 depth = *pp;
 
-        pp = (u32 *)get_property(dp, "linux,bootx-width", &len);
+        pp = get_property(dp, "linux,bootx-width", &len);
         if (pp == NULL)
-                pp = (u32 *)get_property(dp, "width", &len);
+                pp = get_property(dp, "width", &len);
         if (pp && len == sizeof(u32))
                 width = *pp;
 
-        pp = (u32 *)get_property(dp, "linux,bootx-height", &len);
+        pp = get_property(dp, "linux,bootx-height", &len);
         if (pp == NULL)
-                pp = (u32 *)get_property(dp, "height", &len);
+                pp = get_property(dp, "height", &len);
         if (pp && len == sizeof(u32))
                 height = *pp;
 
-        pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
+        pp = get_property(dp, "linux,bootx-linebytes", &len);
         if (pp == NULL)
-                pp = (u32 *)get_property(dp, "linebytes", &len);
+                pp = get_property(dp, "linebytes", &len);
         if (pp && len == sizeof(u32))
                 pitch = *pp;
         else
@@ -450,9 +450,9 @@ static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
          * ranges and pick one that is both big enough and if possible encloses
          * the "address" property. If none match, we pick the biggest
          */
-        up = (u32 *)get_property(dp, "linux,bootx-addr", &len);
+        up = get_property(dp, "linux,bootx-addr", &len);
         if (up == NULL)
-                up = (u32 *)get_property(dp, "address", &len);
+                up = get_property(dp, "address", &len);
         if (up && len == sizeof(u32))
                 addr_prop = *up;
 
diff --git a/drivers/video/riva/fbdev.c b/drivers/video/riva/fbdev.c
index 76fc9d355eb7..9823ba939e11 100644
--- a/drivers/video/riva/fbdev.c
+++ b/drivers/video/riva/fbdev.c
@@ -1831,14 +1831,13 @@ static int __devinit riva_get_EDID_OF(struct fb_info *info, struct pci_dev *pd)
         NVTRACE_ENTER();
         dp = pci_device_to_OF_node(pd);
         for (; dp != NULL; dp = dp->child) {
-                disptype = (unsigned char *)get_property(dp, "display-type", NULL);
+                disptype = get_property(dp, "display-type", NULL);
                 if (disptype == NULL)
                         continue;
                 if (strncmp(disptype, "LCD", 3) != 0)
                         continue;
                 for (i = 0; propnames[i] != NULL; ++i) {
-                        pedid = (unsigned char *)
-                                get_property(dp, propnames[i], NULL);
+                        pedid = get_property(dp, propnames[i], NULL);
                         if (pedid != NULL) {
                                 par->EDID = pedid;
                                 NVTRACE("LCD found.\n");