i2o: move to staging

The I2O layer deals with a technology that to say the least didn't catch on
in the market.

The only relevant products are some of the AMI MegaRAID - which supported I2O
and its native mode (The native mode is faster and runs on Linux), an
obscure crypto ethernet card that's now so many years out of date nobody
would use it, the old DPT controllers, which speak their own dialect and
have their own driver - and ermm.. thats about it.

We also know the code isn't in good shape as recently a patch was proposed
and queried as buggy, which in turn showed the existing code was broken
already by prior "clean up" and nobody had noticed that either.

It's coding style robot code nothing more. Like some forgotten corridor
cleaned relentlessly by a lost Roomba but where no user has trodden in years.

Move it to staging and then to /dev/null.

The headers remain as they are shared with dpt_i2o.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1247 insertions, 0 deletions

diff --git a/drivers/staging/i2o/iop.c b/drivers/staging/i2o/iop.c
new file mode 100644
index 000000000000..52334fc8b547
--- /dev/null
+++ b/drivers/staging/i2o/iop.c
@@ -0,0 +1,1247 @@
+/*
+ *	Functions to handle I2O controllers and I2O message handling
+ *
+ *	Copyright (C) 1999-2002	Red Hat Software
+ *
+ *	Written by Alan Cox, Building Number Three Ltd
+ *
+ *	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.
+ *
+ *	A lot of the I2O message side code from this is taken from the
+ *	Red Creek RCPCI45 adapter driver by Red Creek Communications
+ *
+ *	Fixes/additions:
+ *		Philipp Rumpf
+ *		Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
+ *		Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
+ *		Deepak Saxena <deepak@plexity.net>
+ *		Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
+ *		Alan Cox <alan@lxorguk.ukuu.org.uk>:
+ *			Ported to Linux 2.5.
+ *		Markus Lidel <Markus.Lidel@shadowconnect.com>:
+ *			Minor fixes for 2.6.
+ */
+
+#include <linux/module.h>
+#include "i2o.h"
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include "core.h"
+
+#define OSM_NAME	"i2o"
+#define OSM_VERSION	"1.325"
+#define OSM_DESCRIPTION	"I2O subsystem"
+
+/* global I2O controller list */
+LIST_HEAD(i2o_controllers);
+
+/*
+ * global I2O System Table. Contains information about all the IOPs in the
+ * system. Used to inform IOPs about each others existence.
+ */
+static struct i2o_dma i2o_systab;
+
+static int i2o_hrt_get(struct i2o_controller *c);
+
+/**
+ *	i2o_msg_get_wait - obtain an I2O message from the IOP
+ *	@c: I2O controller
+ *	@wait: how long to wait until timeout
+ *
+ *	This function waits up to wait seconds for a message slot to be
+ *	available.
+ *
+ *	On a success the message is returned and the pointer to the message is
+ *	set in msg. The returned message is the physical page frame offset
+ *	address from the read port (see the i2o spec). If no message is
+ *	available returns I2O_QUEUE_EMPTY and msg is leaved untouched.
+ */
+struct i2o_message *i2o_msg_get_wait(struct i2o_controller *c, int wait)
+{
+	unsigned long timeout = jiffies + wait * HZ;
+	struct i2o_message *msg;
+
+	while (IS_ERR(msg = i2o_msg_get(c))) {
+		if (time_after(jiffies, timeout)) {
+			osm_debug("%s: Timeout waiting for message frame.\n",
+				  c->name);
+			return ERR_PTR(-ETIMEDOUT);
+		}
+		schedule_timeout_uninterruptible(1);
+	}
+
+	return msg;
+};
+
+#if BITS_PER_LONG == 64
+/**
+ *      i2o_cntxt_list_add - Append a pointer to context list and return a id
+ *	@c: controller to which the context list belong
+ *	@ptr: pointer to add to the context list
+ *
+ *	Because the context field in I2O is only 32-bit large, on 64-bit the
+ *	pointer is to large to fit in the context field. The i2o_cntxt_list
+ *	functions therefore map pointers to context fields.
+ *
+ *	Returns context id > 0 on success or 0 on failure.
+ */
+u32 i2o_cntxt_list_add(struct i2o_controller * c, void *ptr)
+{
+	struct i2o_context_list_element *entry;
+	unsigned long flags;
+
+	if (!ptr)
+		osm_err("%s: couldn't add NULL pointer to context list!\n",
+			c->name);
+
+	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+	if (!entry) {
+		osm_err("%s: Could not allocate memory for context list element"
+			"\n", c->name);
+		return 0;
+	}
+
+	entry->ptr = ptr;
+	entry->timestamp = jiffies;
+	INIT_LIST_HEAD(&entry->list);
+
+	spin_lock_irqsave(&c->context_list_lock, flags);
+
+	if (unlikely(atomic_inc_and_test(&c->context_list_counter)))
+		atomic_inc(&c->context_list_counter);
+
+	entry->context = atomic_read(&c->context_list_counter);
+
+	list_add(&entry->list, &c->context_list);
+
+	spin_unlock_irqrestore(&c->context_list_lock, flags);
+
+	osm_debug("%s: Add context to list %p -> %d\n", c->name, ptr, context);
+
+	return entry->context;
+};
+
+/**
+ *      i2o_cntxt_list_remove - Remove a pointer from the context list
+ *	@c: controller to which the context list belong
+ *	@ptr: pointer which should be removed from the context list
+ *
+ *	Removes a previously added pointer from the context list and returns
+ *	the matching context id.
+ *
+ *	Returns context id on success or 0 on failure.
+ */
+u32 i2o_cntxt_list_remove(struct i2o_controller * c, void *ptr)
+{
+	struct i2o_context_list_element *entry;
+	u32 context = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&c->context_list_lock, flags);
+	list_for_each_entry(entry, &c->context_list, list)
+	    if (entry->ptr == ptr) {
+		list_del(&entry->list);
+		context = entry->context;
+		kfree(entry);
+		break;
+	}
+	spin_unlock_irqrestore(&c->context_list_lock, flags);
+
+	if (!context)
+		osm_warn("%s: Could not remove nonexistent ptr %p\n", c->name,
+			 ptr);
+
+	osm_debug("%s: remove ptr from context list %d -> %p\n", c->name,
+		  context, ptr);
+
+	return context;
+};
+
+/**
+ *      i2o_cntxt_list_get - Get a pointer from the context list and remove it
+ *	@c: controller to which the context list belong
+ *	@context: context id to which the pointer belong
+ *
+ *	Returns pointer to the matching context id on success or NULL on
+ *	failure.
+ */
+void *i2o_cntxt_list_get(struct i2o_controller *c, u32 context)
+{
+	struct i2o_context_list_element *entry;
+	unsigned long flags;
+	void *ptr = NULL;
+
+	spin_lock_irqsave(&c->context_list_lock, flags);
+	list_for_each_entry(entry, &c->context_list, list)
+	    if (entry->context == context) {
+		list_del(&entry->list);
+		ptr = entry->ptr;
+		kfree(entry);
+		break;
+	}
+	spin_unlock_irqrestore(&c->context_list_lock, flags);
+
+	if (!ptr)
+		osm_warn("%s: context id %d not found\n", c->name, context);
+
+	osm_debug("%s: get ptr from context list %d -> %p\n", c->name, context,
+		  ptr);
+
+	return ptr;
+};
+
+/**
+ *      i2o_cntxt_list_get_ptr - Get a context id from the context list
+ *	@c: controller to which the context list belong
+ *	@ptr: pointer to which the context id should be fetched
+ *
+ *	Returns context id which matches to the pointer on success or 0 on
+ *	failure.
+ */
+u32 i2o_cntxt_list_get_ptr(struct i2o_controller * c, void *ptr)
+{
+	struct i2o_context_list_element *entry;
+	u32 context = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&c->context_list_lock, flags);
+	list_for_each_entry(entry, &c->context_list, list)
+	    if (entry->ptr == ptr) {
+		context = entry->context;
+		break;
+	}
+	spin_unlock_irqrestore(&c->context_list_lock, flags);
+
+	if (!context)
+		osm_warn("%s: Could not find nonexistent ptr %p\n", c->name,
+			 ptr);
+
+	osm_debug("%s: get context id from context list %p -> %d\n", c->name,
+		  ptr, context);
+
+	return context;
+};
+#endif
+
+/**
+ *	i2o_iop_find - Find an I2O controller by id
+ *	@unit: unit number of the I2O controller to search for
+ *
+ *	Lookup the I2O controller on the controller list.
+ *
+ *	Returns pointer to the I2O controller on success or NULL if not found.
+ */
+struct i2o_controller *i2o_find_iop(int unit)
+{
+	struct i2o_controller *c;
+
+	list_for_each_entry(c, &i2o_controllers, list) {
+		if (c->unit == unit)
+			return c;
+	}
+
+	return NULL;
+};
+
+/**
+ *	i2o_iop_find_device - Find a I2O device on an I2O controller
+ *	@c: I2O controller where the I2O device hangs on
+ *	@tid: TID of the I2O device to search for
+ *
+ *	Searches the devices of the I2O controller for a device with TID tid and
+ *	returns it.
+ *
+ *	Returns a pointer to the I2O device if found, otherwise NULL.
+ */
+struct i2o_device *i2o_iop_find_device(struct i2o_controller *c, u16 tid)
+{
+	struct i2o_device *dev;
+
+	list_for_each_entry(dev, &c->devices, list)
+	    if (dev->lct_data.tid == tid)
+		return dev;
+
+	return NULL;
+};
+
+/**
+ *	i2o_quiesce_controller - quiesce controller
+ *	@c: controller
+ *
+ *	Quiesce an IOP. Causes IOP to make external operation quiescent
+ *	(i2o 'READY' state). Internal operation of the IOP continues normally.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_iop_quiesce(struct i2o_controller *c)
+{
+	struct i2o_message *msg;
+	i2o_status_block *sb = c->status_block.virt;
+	int rc;
+
+	i2o_status_get(c);
+
+	/* SysQuiesce discarded if IOP not in READY or OPERATIONAL state */
+	if ((sb->iop_state != ADAPTER_STATE_READY) &&
+	    (sb->iop_state != ADAPTER_STATE_OPERATIONAL))
+		return 0;
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return PTR_ERR(msg);
+
+	msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_SYS_QUIESCE << 24 | HOST_TID << 12 |
+			ADAPTER_TID);
+
+	/* Long timeout needed for quiesce if lots of devices */
+	if ((rc = i2o_msg_post_wait(c, msg, 240)))
+		osm_info("%s: Unable to quiesce (status=%#x).\n", c->name, -rc);
+	else
+		osm_debug("%s: Quiesced.\n", c->name);
+
+	i2o_status_get(c);	// Entered READY state
+
+	return rc;
+};
+
+/**
+ *	i2o_iop_enable - move controller from ready to OPERATIONAL
+ *	@c: I2O controller
+ *
+ *	Enable IOP. This allows the IOP to resume external operations and
+ *	reverses the effect of a quiesce. Returns zero or an error code if
+ *	an error occurs.
+ */
+static int i2o_iop_enable(struct i2o_controller *c)
+{
+	struct i2o_message *msg;
+	i2o_status_block *sb = c->status_block.virt;
+	int rc;
+
+	i2o_status_get(c);
+
+	/* Enable only allowed on READY state */
+	if (sb->iop_state != ADAPTER_STATE_READY)
+		return -EINVAL;
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return PTR_ERR(msg);
+
+	msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_SYS_ENABLE << 24 | HOST_TID << 12 |
+			ADAPTER_TID);
+
+	/* How long of a timeout do we need? */
+	if ((rc = i2o_msg_post_wait(c, msg, 240)))
+		osm_err("%s: Could not enable (status=%#x).\n", c->name, -rc);
+	else
+		osm_debug("%s: Enabled.\n", c->name);
+
+	i2o_status_get(c);	// entered OPERATIONAL state
+
+	return rc;
+};
+
+/**
+ *	i2o_iop_quiesce_all - Quiesce all I2O controllers on the system
+ *
+ *	Quiesce all I2O controllers which are connected to the system.
+ */
+static inline void i2o_iop_quiesce_all(void)
+{
+	struct i2o_controller *c, *tmp;
+
+	list_for_each_entry_safe(c, tmp, &i2o_controllers, list) {
+		if (!c->no_quiesce)
+			i2o_iop_quiesce(c);
+	}
+};
+
+/**
+ *	i2o_iop_enable_all - Enables all controllers on the system
+ *
+ *	Enables all I2O controllers which are connected to the system.
+ */
+static inline void i2o_iop_enable_all(void)
+{
+	struct i2o_controller *c, *tmp;
+
+	list_for_each_entry_safe(c, tmp, &i2o_controllers, list)
+	    i2o_iop_enable(c);
+};
+
+/**
+ *	i2o_clear_controller - Bring I2O controller into HOLD state
+ *	@c: controller
+ *
+ *	Clear an IOP to HOLD state, ie. terminate external operations, clear all
+ *	input queues and prepare for a system restart. IOP's internal operation
+ *	continues normally and the outbound queue is alive. The IOP is not
+ *	expected to rebuild its LCT.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_iop_clear(struct i2o_controller *c)
+{
+	struct i2o_message *msg;
+	int rc;
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return PTR_ERR(msg);
+
+	/* Quiesce all IOPs first */
+	i2o_iop_quiesce_all();
+
+	msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_ADAPTER_CLEAR << 24 | HOST_TID << 12 |
+			ADAPTER_TID);
+
+	if ((rc = i2o_msg_post_wait(c, msg, 30)))
+		osm_info("%s: Unable to clear (status=%#x).\n", c->name, -rc);
+	else
+		osm_debug("%s: Cleared.\n", c->name);
+
+	/* Enable all IOPs */
+	i2o_iop_enable_all();
+
+	return rc;
+}
+
+/**
+ *	i2o_iop_init_outbound_queue - setup the outbound message queue
+ *	@c: I2O controller
+ *
+ *	Clear and (re)initialize IOP's outbound queue and post the message
+ *	frames to the IOP.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_iop_init_outbound_queue(struct i2o_controller *c)
+{
+	u32 m;
+	volatile u8 *status = c->status.virt;
+	struct i2o_message *msg;
+	ulong timeout;
+	int i;
+
+	osm_debug("%s: Initializing Outbound Queue...\n", c->name);
+
+	memset(c->status.virt, 0, 4);
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return PTR_ERR(msg);
+
+	msg->u.head[0] = cpu_to_le32(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_OUTBOUND_INIT << 24 | HOST_TID << 12 |
+			ADAPTER_TID);
+	msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
+	msg->u.s.tcntxt = cpu_to_le32(0x00000000);
+	msg->body[0] = cpu_to_le32(PAGE_SIZE);
+	/* Outbound msg frame size in words and Initcode */
+	msg->body[1] = cpu_to_le32(I2O_OUTBOUND_MSG_FRAME_SIZE << 16 | 0x80);
+	msg->body[2] = cpu_to_le32(0xd0000004);
+	msg->body[3] = cpu_to_le32(i2o_dma_low(c->status.phys));
+	msg->body[4] = cpu_to_le32(i2o_dma_high(c->status.phys));
+
+	i2o_msg_post(c, msg);
+
+	timeout = jiffies + I2O_TIMEOUT_INIT_OUTBOUND_QUEUE * HZ;
+	while (*status <= I2O_CMD_IN_PROGRESS) {
+		if (time_after(jiffies, timeout)) {
+			osm_warn("%s: Timeout Initializing\n", c->name);
+			return -ETIMEDOUT;
+		}
+		schedule_timeout_uninterruptible(1);
+	}
+
+	m = c->out_queue.phys;
+
+	/* Post frames */
+	for (i = 0; i < I2O_MAX_OUTBOUND_MSG_FRAMES; i++) {
+		i2o_flush_reply(c, m);
+		udelay(1);	/* Promise */
+		m += I2O_OUTBOUND_MSG_FRAME_SIZE * sizeof(u32);
+	}
+
+	return 0;
+}
+
+/**
+ *	i2o_iop_reset - reset an I2O controller
+ *	@c: controller to reset
+ *
+ *	Reset the IOP into INIT state and wait until IOP gets into RESET state.
+ *	Terminate all external operations, clear IOP's inbound and outbound
+ *	queues, terminate all DDMs, and reload the IOP's operating environment
+ *	and all local DDMs. The IOP rebuilds its LCT.
+ */
+static int i2o_iop_reset(struct i2o_controller *c)
+{
+	volatile u8 *status = c->status.virt;
+	struct i2o_message *msg;
+	unsigned long timeout;
+	i2o_status_block *sb = c->status_block.virt;
+	int rc = 0;
+
+	osm_debug("%s: Resetting controller\n", c->name);
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return PTR_ERR(msg);
+
+	memset(c->status_block.virt, 0, 8);
+
+	/* Quiesce all IOPs first */
+	i2o_iop_quiesce_all();
+
+	msg->u.head[0] = cpu_to_le32(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_0);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_ADAPTER_RESET << 24 | HOST_TID << 12 |
+			ADAPTER_TID);
+	msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
+	msg->u.s.tcntxt = cpu_to_le32(0x00000000);
+	msg->body[0] = cpu_to_le32(0x00000000);
+	msg->body[1] = cpu_to_le32(0x00000000);
+	msg->body[2] = cpu_to_le32(i2o_dma_low(c->status.phys));
+	msg->body[3] = cpu_to_le32(i2o_dma_high(c->status.phys));
+
+	i2o_msg_post(c, msg);
+
+	/* Wait for a reply */
+	timeout = jiffies + I2O_TIMEOUT_RESET * HZ;
+	while (!*status) {
+		if (time_after(jiffies, timeout))
+			break;
+
+		schedule_timeout_uninterruptible(1);
+	}
+
+	switch (*status) {
+	case I2O_CMD_REJECTED:
+		osm_warn("%s: IOP reset rejected\n", c->name);
+		rc = -EPERM;
+		break;
+
+	case I2O_CMD_IN_PROGRESS:
+		/*
+		 * Once the reset is sent, the IOP goes into the INIT state
+		 * which is indeterminate. We need to wait until the IOP has
+		 * rebooted before we can let the system talk to it. We read
+		 * the inbound Free_List until a message is available. If we
+		 * can't read one in the given amount of time, we assume the
+		 * IOP could not reboot properly.
+		 */
+		osm_debug("%s: Reset in progress, waiting for reboot...\n",
+			  c->name);
+
+		while (IS_ERR(msg = i2o_msg_get_wait(c, I2O_TIMEOUT_RESET))) {
+			if (time_after(jiffies, timeout)) {
+				osm_err("%s: IOP reset timeout.\n", c->name);
+				rc = PTR_ERR(msg);
+				goto exit;
+			}
+			schedule_timeout_uninterruptible(1);
+		}
+		i2o_msg_nop(c, msg);
+
+		/* from here all quiesce commands are safe */
+		c->no_quiesce = 0;
+
+		/* verify if controller is in state RESET */
+		i2o_status_get(c);
+
+		if (!c->promise && (sb->iop_state != ADAPTER_STATE_RESET))
+			osm_warn("%s: reset completed, but adapter not in RESET"
+				 " state.\n", c->name);
+		else
+			osm_debug("%s: reset completed.\n", c->name);
+
+		break;
+
+	default:
+		osm_err("%s: IOP reset timeout.\n", c->name);
+		rc = -ETIMEDOUT;
+		break;
+	}
+
+      exit:
+	/* Enable all IOPs */
+	i2o_iop_enable_all();
+
+	return rc;
+};
+
+/**
+ *	i2o_iop_activate - Bring controller up to HOLD
+ *	@c: controller
+ *
+ *	This function brings an I2O controller into HOLD state. The adapter
+ *	is reset if necessary and then the queues and resource table are read.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_iop_activate(struct i2o_controller *c)
+{
+	i2o_status_block *sb = c->status_block.virt;
+	int rc;
+	int state;
+
+	/* In INIT state, Wait Inbound Q to initialize (in i2o_status_get) */
+	/* In READY state, Get status */
+
+	rc = i2o_status_get(c);
+	if (rc) {
+		osm_info("%s: Unable to obtain status, attempting a reset.\n",
+			 c->name);
+		rc = i2o_iop_reset(c);
+		if (rc)
+			return rc;
+	}
+
+	if (sb->i2o_version > I2OVER15) {
+		osm_err("%s: Not running version 1.5 of the I2O Specification."
+			"\n", c->name);
+		return -ENODEV;
+	}
+
+	switch (sb->iop_state) {
+	case ADAPTER_STATE_FAULTED:
+		osm_err("%s: hardware fault\n", c->name);
+		return -EFAULT;
+
+	case ADAPTER_STATE_READY:
+	case ADAPTER_STATE_OPERATIONAL:
+	case ADAPTER_STATE_HOLD:
+	case ADAPTER_STATE_FAILED:
+		osm_debug("%s: already running, trying to reset...\n", c->name);
+		rc = i2o_iop_reset(c);
+		if (rc)
+			return rc;
+	}
+
+	/* preserve state */
+	state = sb->iop_state;
+
+	rc = i2o_iop_init_outbound_queue(c);
+	if (rc)
+		return rc;
+
+	/* if adapter was not in RESET state clear now */
+	if (state != ADAPTER_STATE_RESET)
+		i2o_iop_clear(c);
+
+	i2o_status_get(c);
+
+	if (sb->iop_state != ADAPTER_STATE_HOLD) {
+		osm_err("%s: failed to bring IOP into HOLD state\n", c->name);
+		return -EIO;
+	}
+
+	return i2o_hrt_get(c);
+};
+
+static void i2o_res_alloc(struct i2o_controller *c, unsigned long flags)
+{
+	i2o_status_block *sb = c->status_block.virt;
+	struct resource *res = &c->mem_resource;
+	resource_size_t size, align;
+	int err;
+
+	res->name = c->pdev->bus->name;
+	res->flags = flags;
+	res->start = 0;
+	res->end = 0;
+	osm_info("%s: requires private memory resources.\n", c->name);
+
+	if (flags & IORESOURCE_MEM) {
+		size = sb->desired_mem_size;
+		align = 1 << 20;	/* unspecified, use 1Mb and play safe */
+	} else {
+		size = sb->desired_io_size;
+		align = 1 << 12;	/* unspecified, use 4Kb and play safe */
+	}
+
+	err = pci_bus_alloc_resource(c->pdev->bus, res, size, align, 0, 0,
+				     NULL, NULL);
+	if (err < 0)
+		return;
+
+	if (flags & IORESOURCE_MEM) {
+		c->mem_alloc = 1;
+		sb->current_mem_size = resource_size(res);
+		sb->current_mem_base = res->start;
+	} else if (flags & IORESOURCE_IO) {
+		c->io_alloc = 1;
+		sb->current_io_size = resource_size(res);
+		sb->current_io_base = res->start;
+	}
+	osm_info("%s: allocated PCI space %pR\n", c->name, res);
+}
+
+/**
+ *	i2o_iop_systab_set - Set the I2O System Table of the specified IOP
+ *	@c: I2O controller to which the system table should be send
+ *
+ *	Before the systab could be set i2o_systab_build() must be called.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_iop_systab_set(struct i2o_controller *c)
+{
+	struct i2o_message *msg;
+	i2o_status_block *sb = c->status_block.virt;
+	struct device *dev = &c->pdev->dev;
+	int rc;
+
+	if (sb->current_mem_size < sb->desired_mem_size)
+		i2o_res_alloc(c, IORESOURCE_MEM);
+
+	if (sb->current_io_size < sb->desired_io_size)
+		i2o_res_alloc(c, IORESOURCE_IO);
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return PTR_ERR(msg);
+
+	i2o_systab.phys = dma_map_single(dev, i2o_systab.virt, i2o_systab.len,
+					 PCI_DMA_TODEVICE);
+	if (!i2o_systab.phys) {
+		i2o_msg_nop(c, msg);
+		return -ENOMEM;
+	}
+
+	msg->u.head[0] = cpu_to_le32(I2O_MESSAGE_SIZE(12) | SGL_OFFSET_6);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_SYS_TAB_SET << 24 | HOST_TID << 12 |
+			ADAPTER_TID);
+
+	/*
+	 * Provide three SGL-elements:
+	 * System table (SysTab), Private memory space declaration and
+	 * Private i/o space declaration
+	 */
+
+	msg->body[0] = cpu_to_le32(c->unit + 2);
+	msg->body[1] = cpu_to_le32(0x00000000);
+	msg->body[2] = cpu_to_le32(0x54000000 | i2o_systab.len);
+	msg->body[3] = cpu_to_le32(i2o_systab.phys);
+	msg->body[4] = cpu_to_le32(0x54000000 | sb->current_mem_size);
+	msg->body[5] = cpu_to_le32(sb->current_mem_base);
+	msg->body[6] = cpu_to_le32(0xd4000000 | sb->current_io_size);
+	msg->body[6] = cpu_to_le32(sb->current_io_base);
+
+	rc = i2o_msg_post_wait(c, msg, 120);
+
+	dma_unmap_single(dev, i2o_systab.phys, i2o_systab.len,
+			 PCI_DMA_TODEVICE);
+
+	if (rc < 0)
+		osm_err("%s: Unable to set SysTab (status=%#x).\n", c->name,
+			-rc);
+	else
+		osm_debug("%s: SysTab set.\n", c->name);
+
+	return rc;
+}
+
+/**
+ *	i2o_iop_online - Bring a controller online into OPERATIONAL state.
+ *	@c: I2O controller
+ *
+ *	Send the system table and enable the I2O controller.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_iop_online(struct i2o_controller *c)
+{
+	int rc;
+
+	rc = i2o_iop_systab_set(c);
+	if (rc)
+		return rc;
+
+	/* In READY state */
+	osm_debug("%s: Attempting to enable...\n", c->name);
+	rc = i2o_iop_enable(c);
+	if (rc)
+		return rc;
+
+	return 0;
+};
+
+/**
+ *	i2o_iop_remove - Remove the I2O controller from the I2O core
+ *	@c: I2O controller
+ *
+ *	Remove the I2O controller from the I2O core. If devices are attached to
+ *	the controller remove these also and finally reset the controller.
+ */
+void i2o_iop_remove(struct i2o_controller *c)
+{
+	struct i2o_device *dev, *tmp;
+
+	osm_debug("%s: deleting controller\n", c->name);
+
+	i2o_driver_notify_controller_remove_all(c);
+
+	list_del(&c->list);
+
+	list_for_each_entry_safe(dev, tmp, &c->devices, list)
+	    i2o_device_remove(dev);
+
+	device_del(&c->device);
+
+	/* Ask the IOP to switch to RESET state */
+	i2o_iop_reset(c);
+}
+
+/**
+ *	i2o_systab_build - Build system table
+ *
+ *	The system table contains information about all the IOPs in the system
+ *	(duh) and is used by the Executives on the IOPs to establish peer2peer
+ *	connections. We're not supporting peer2peer at the moment, but this
+ *	will be needed down the road for things like lan2lan forwarding.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_systab_build(void)
+{
+	struct i2o_controller *c, *tmp;
+	int num_controllers = 0;
+	u32 change_ind = 0;
+	int count = 0;
+	struct i2o_sys_tbl *systab = i2o_systab.virt;
+
+	list_for_each_entry_safe(c, tmp, &i2o_controllers, list)
+	    num_controllers++;
+
+	if (systab) {
+		change_ind = systab->change_ind;
+		kfree(i2o_systab.virt);
+	}
+
+	/* Header + IOPs */
+	i2o_systab.len = sizeof(struct i2o_sys_tbl) + num_controllers *
+	    sizeof(struct i2o_sys_tbl_entry);
+
+	systab = i2o_systab.virt = kzalloc(i2o_systab.len, GFP_KERNEL);
+	if (!systab) {
+		osm_err("unable to allocate memory for System Table\n");
+		return -ENOMEM;
+	}
+
+	systab->version = I2OVERSION;
+	systab->change_ind = change_ind + 1;
+
+	list_for_each_entry_safe(c, tmp, &i2o_controllers, list) {
+		i2o_status_block *sb;
+
+		if (count >= num_controllers) {
+			osm_err("controller added while building system table"
+				"\n");
+			break;
+		}
+
+		sb = c->status_block.virt;
+
+		/*
+		 * Get updated IOP state so we have the latest information
+		 *
+		 * We should delete the controller at this point if it
+		 * doesn't respond since if it's not on the system table
+		 * it is techninically not part of the I2O subsystem...
+		 */
+		if (unlikely(i2o_status_get(c))) {
+			osm_err("%s: Deleting b/c could not get status while "
+				"attempting to build system table\n", c->name);
+			i2o_iop_remove(c);
+			continue;	// try the next one
+		}
+
+		systab->iops[count].org_id = sb->org_id;
+		systab->iops[count].iop_id = c->unit + 2;
+		systab->iops[count].seg_num = 0;
+		systab->iops[count].i2o_version = sb->i2o_version;
+		systab->iops[count].iop_state = sb->iop_state;
+		systab->iops[count].msg_type = sb->msg_type;
+		systab->iops[count].frame_size = sb->inbound_frame_size;
+		systab->iops[count].last_changed = change_ind;
+		systab->iops[count].iop_capabilities = sb->iop_capabilities;
+		systab->iops[count].inbound_low =
+		    i2o_dma_low(c->base.phys + I2O_IN_PORT);
+		systab->iops[count].inbound_high =
+		    i2o_dma_high(c->base.phys + I2O_IN_PORT);
+
+		count++;
+	}
+
+	systab->num_entries = count;
+
+	return 0;
+};
+
+/**
+ *	i2o_parse_hrt - Parse the hardware resource table.
+ *	@c: I2O controller
+ *
+ *	We don't do anything with it except dumping it (in debug mode).
+ *
+ *	Returns 0.
+ */
+static int i2o_parse_hrt(struct i2o_controller *c)
+{
+	i2o_dump_hrt(c);
+	return 0;
+};
+
+/**
+ *	i2o_status_get - Get the status block from the I2O controller
+ *	@c: I2O controller
+ *
+ *	Issue a status query on the controller. This updates the attached
+ *	status block. The status block could then be accessed through
+ *	c->status_block.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+int i2o_status_get(struct i2o_controller *c)
+{
+	struct i2o_message *msg;
+	volatile u8 *status_block;
+	unsigned long timeout;
+
+	status_block = (u8 *) c->status_block.virt;
+	memset(c->status_block.virt, 0, sizeof(i2o_status_block));
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return PTR_ERR(msg);
+
+	msg->u.head[0] = cpu_to_le32(NINE_WORD_MSG_SIZE | SGL_OFFSET_0);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_STATUS_GET << 24 | HOST_TID << 12 |
+			ADAPTER_TID);
+	msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
+	msg->u.s.tcntxt = cpu_to_le32(0x00000000);
+	msg->body[0] = cpu_to_le32(0x00000000);
+	msg->body[1] = cpu_to_le32(0x00000000);
+	msg->body[2] = cpu_to_le32(i2o_dma_low(c->status_block.phys));
+	msg->body[3] = cpu_to_le32(i2o_dma_high(c->status_block.phys));
+	msg->body[4] = cpu_to_le32(sizeof(i2o_status_block));	/* always 88 bytes */
+
+	i2o_msg_post(c, msg);
+
+	/* Wait for a reply */
+	timeout = jiffies + I2O_TIMEOUT_STATUS_GET * HZ;
+	while (status_block[87] != 0xFF) {
+		if (time_after(jiffies, timeout)) {
+			osm_err("%s: Get status timeout.\n", c->name);
+			return -ETIMEDOUT;
+		}
+
+		schedule_timeout_uninterruptible(1);
+	}
+
+#ifdef DEBUG
+	i2o_debug_state(c);
+#endif
+
+	return 0;
+}
+
+/*
+ *	i2o_hrt_get - Get the Hardware Resource Table from the I2O controller
+ *	@c: I2O controller from which the HRT should be fetched
+ *
+ *	The HRT contains information about possible hidden devices but is
+ *	mostly useless to us.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_hrt_get(struct i2o_controller *c)
+{
+	int rc;
+	int i;
+	i2o_hrt *hrt = c->hrt.virt;
+	u32 size = sizeof(i2o_hrt);
+	struct device *dev = &c->pdev->dev;
+
+	for (i = 0; i < I2O_HRT_GET_TRIES; i++) {
+		struct i2o_message *msg;
+
+		msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+		if (IS_ERR(msg))
+			return PTR_ERR(msg);
+
+		msg->u.head[0] = cpu_to_le32(SIX_WORD_MSG_SIZE | SGL_OFFSET_4);
+		msg->u.head[1] =
+		    cpu_to_le32(I2O_CMD_HRT_GET << 24 | HOST_TID << 12 |
+				ADAPTER_TID);
+		msg->body[0] = cpu_to_le32(0xd0000000 | c->hrt.len);
+		msg->body[1] = cpu_to_le32(c->hrt.phys);
+
+		rc = i2o_msg_post_wait_mem(c, msg, 20, &c->hrt);
+
+		if (rc < 0) {
+			osm_err("%s: Unable to get HRT (status=%#x)\n", c->name,
+				-rc);
+			return rc;
+		}
+
+		size = hrt->num_entries * hrt->entry_len << 2;
+		if (size > c->hrt.len) {
+			if (i2o_dma_realloc(dev, &c->hrt, size))
+				return -ENOMEM;
+			else
+				hrt = c->hrt.virt;
+		} else
+			return i2o_parse_hrt(c);
+	}
+
+	osm_err("%s: Unable to get HRT after %d tries, giving up\n", c->name,
+		I2O_HRT_GET_TRIES);
+
+	return -EBUSY;
+}
+
+/**
+ *	i2o_iop_release - release the memory for a I2O controller
+ *	@dev: I2O controller which should be released
+ *
+ *	Release the allocated memory. This function is called if refcount of
+ *	device reaches 0 automatically.
+ */
+static void i2o_iop_release(struct device *dev)
+{
+	struct i2o_controller *c = to_i2o_controller(dev);
+
+	i2o_iop_free(c);
+};
+
+/**
+ *	i2o_iop_alloc - Allocate and initialize a i2o_controller struct
+ *
+ *	Allocate the necessary memory for a i2o_controller struct and
+ *	initialize the lists and message mempool.
+ *
+ *	Returns a pointer to the I2O controller or a negative error code on
+ *	failure.
+ */
+struct i2o_controller *i2o_iop_alloc(void)
+{
+	static int unit = 0;	/* 0 and 1 are NULL IOP and Local Host */
+	struct i2o_controller *c;
+	char poolname[32];
+
+	c = kzalloc(sizeof(*c), GFP_KERNEL);
+	if (!c) {
+		osm_err("i2o: Insufficient memory to allocate a I2O controller."
+			"\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	c->unit = unit++;
+	sprintf(c->name, "iop%d", c->unit);
+
+	snprintf(poolname, sizeof(poolname), "i2o_%s_msg_inpool", c->name);
+	if (i2o_pool_alloc
+	    (&c->in_msg, poolname, I2O_INBOUND_MSG_FRAME_SIZE * 4 + sizeof(u32),
+	     I2O_MSG_INPOOL_MIN)) {
+		kfree(c);
+		return ERR_PTR(-ENOMEM);
+	};
+
+	INIT_LIST_HEAD(&c->devices);
+	spin_lock_init(&c->lock);
+	mutex_init(&c->lct_lock);
+
+	device_initialize(&c->device);
+
+	c->device.release = &i2o_iop_release;
+
+	dev_set_name(&c->device, "iop%d", c->unit);
+
+#if BITS_PER_LONG == 64
+	spin_lock_init(&c->context_list_lock);
+	atomic_set(&c->context_list_counter, 0);
+	INIT_LIST_HEAD(&c->context_list);
+#endif
+
+	return c;
+};
+
+/**
+ *	i2o_iop_add - Initialize the I2O controller and add him to the I2O core
+ *	@c: controller
+ *
+ *	Initialize the I2O controller and if no error occurs add him to the I2O
+ *	core.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+int i2o_iop_add(struct i2o_controller *c)
+{
+	int rc;
+
+	if ((rc = device_add(&c->device))) {
+		osm_err("%s: could not add controller\n", c->name);
+		goto iop_reset;
+	}
+
+	osm_info("%s: Activating I2O controller...\n", c->name);
+	osm_info("%s: This may take a few minutes if there are many devices\n",
+		 c->name);
+
+	if ((rc = i2o_iop_activate(c))) {
+		osm_err("%s: could not activate controller\n", c->name);
+		goto device_del;
+	}
+
+	osm_debug("%s: building sys table...\n", c->name);
+
+	if ((rc = i2o_systab_build()))
+		goto device_del;
+
+	osm_debug("%s: online controller...\n", c->name);
+
+	if ((rc = i2o_iop_online(c)))
+		goto device_del;
+
+	osm_debug("%s: getting LCT...\n", c->name);
+
+	if ((rc = i2o_exec_lct_get(c)))
+		goto device_del;
+
+	list_add(&c->list, &i2o_controllers);
+
+	i2o_driver_notify_controller_add_all(c);
+
+	osm_info("%s: Controller added\n", c->name);
+
+	return 0;
+
+      device_del:
+	device_del(&c->device);
+
+      iop_reset:
+	i2o_iop_reset(c);
+
+	return rc;
+};
+
+/**
+ *	i2o_event_register - Turn on/off event notification for a I2O device
+ *	@dev: I2O device which should receive the event registration request
+ *	@drv: driver which want to get notified
+ *	@tcntxt: transaction context to use with this notifier
+ *	@evt_mask: mask of events
+ *
+ *	Create and posts an event registration message to the task. No reply
+ *	is waited for, or expected. If you do not want further notifications,
+ *	call the i2o_event_register again with a evt_mask of 0.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+int i2o_event_register(struct i2o_device *dev, struct i2o_driver *drv,
+		       int tcntxt, u32 evt_mask)
+{
+	struct i2o_controller *c = dev->iop;
+	struct i2o_message *msg;
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return PTR_ERR(msg);
+
+	msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_UTIL_EVT_REGISTER << 24 | HOST_TID << 12 | dev->
+			lct_data.tid);
+	msg->u.s.icntxt = cpu_to_le32(drv->context);
+	msg->u.s.tcntxt = cpu_to_le32(tcntxt);
+	msg->body[0] = cpu_to_le32(evt_mask);
+
+	i2o_msg_post(c, msg);
+
+	return 0;
+};
+
+/**
+ *	i2o_iop_init - I2O main initialization function
+ *
+ *	Initialize the I2O drivers (OSM) functions, register the Executive OSM,
+ *	initialize the I2O PCI part and finally initialize I2O device stuff.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int __init i2o_iop_init(void)
+{
+	int rc = 0;
+
+	printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
+
+	if ((rc = i2o_driver_init()))
+		goto exit;
+
+	if ((rc = i2o_exec_init()))
+		goto driver_exit;
+
+	if ((rc = i2o_pci_init()))
+		goto exec_exit;
+
+	return 0;
+
+      exec_exit:
+	i2o_exec_exit();
+
+      driver_exit:
+	i2o_driver_exit();
+
+      exit:
+	return rc;
+}
+
+/**
+ *	i2o_iop_exit - I2O main exit function
+ *
+ *	Removes I2O controllers from PCI subsystem and shut down OSMs.
+ */
+static void __exit i2o_iop_exit(void)
+{
+	i2o_pci_exit();
+	i2o_exec_exit();
+	i2o_driver_exit();
+};
+
+module_init(i2o_iop_init);
+module_exit(i2o_iop_exit);
+
+MODULE_AUTHOR("Red Hat Software");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(OSM_DESCRIPTION);
+MODULE_VERSION(OSM_VERSION);
+
+#if BITS_PER_LONG == 64
+EXPORT_SYMBOL(i2o_cntxt_list_add);
+EXPORT_SYMBOL(i2o_cntxt_list_get);
+EXPORT_SYMBOL(i2o_cntxt_list_remove);
+EXPORT_SYMBOL(i2o_cntxt_list_get_ptr);
+#endif
+EXPORT_SYMBOL(i2o_msg_get_wait);
+EXPORT_SYMBOL(i2o_find_iop);
+EXPORT_SYMBOL(i2o_iop_find_device);
+EXPORT_SYMBOL(i2o_event_register);
+EXPORT_SYMBOL(i2o_status_get);
+EXPORT_SYMBOL(i2o_controllers);