Initial import

1 files changed, 1384 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/ibmphp_core.c b/drivers/pci/hotplug/ibmphp_core.c
new file mode 100644
index 000000000..15302475f
--- /dev/null
+++ b/drivers/pci/hotplug/ibmphp_core.c
@@ -0,0 +1,1384 @@
+/*
+ * IBM Hot Plug Controller Driver
+ *
+ * Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
+ *
+ * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2001-2003 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * 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, GOOD TITLE or
+ * NON INFRINGEMENT.  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <gregkh@us.ibm.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include "../pci.h"
+#include <asm/pci_x86.h>		/* for struct irq_routing_table */
+#include <asm/io_apic.h>
+#include "ibmphp.h"
+
+#define attn_on(sl)  ibmphp_hpc_writeslot (sl, HPC_SLOT_ATTNON)
+#define attn_off(sl) ibmphp_hpc_writeslot (sl, HPC_SLOT_ATTNOFF)
+#define attn_LED_blink(sl) ibmphp_hpc_writeslot (sl, HPC_SLOT_BLINKLED)
+#define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot (sl, READ_REVLEVEL, rev)
+#define get_hpc_options(sl, opt) ibmphp_hpc_readslot (sl, READ_HPCOPTIONS, opt)
+
+#define DRIVER_VERSION	"0.6"
+#define DRIVER_DESC	"IBM Hot Plug PCI Controller Driver"
+
+int ibmphp_debug;
+
+static bool debug;
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC (debug, "Debugging mode enabled or not");
+MODULE_LICENSE ("GPL");
+MODULE_DESCRIPTION (DRIVER_DESC);
+
+struct pci_bus *ibmphp_pci_bus;
+static int max_slots;
+
+static int irqs[16];    /* PIC mode IRQs we're using so far (in case MPS
+			 * tables don't provide default info for empty slots */
+
+static int init_flag;
+
+/*
+static int get_max_adapter_speed_1 (struct hotplug_slot *, u8 *, u8);
+
+static inline int get_max_adapter_speed (struct hotplug_slot *hs, u8 *value)
+{
+	return get_max_adapter_speed_1 (hs, value, 1);
+}
+*/
+static inline int get_cur_bus_info(struct slot **sl)
+{
+	int rc = 1;
+	struct slot *slot_cur = *sl;
+
+	debug("options = %x\n", slot_cur->ctrl->options);
+	debug("revision = %x\n", slot_cur->ctrl->revision);
+
+	if (READ_BUS_STATUS(slot_cur->ctrl))
+		rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL);
+
+	if (rc)
+		return rc;
+
+	slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus);
+	if (READ_BUS_MODE(slot_cur->ctrl))
+		slot_cur->bus_on->current_bus_mode =
+				CURRENT_BUS_MODE(slot_cur->busstatus);
+	else
+		slot_cur->bus_on->current_bus_mode = 0xFF;
+
+	debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n",
+			slot_cur->busstatus,
+			slot_cur->bus_on->current_speed,
+			slot_cur->bus_on->current_bus_mode);
+
+	*sl = slot_cur;
+	return 0;
+}
+
+static inline int slot_update(struct slot **sl)
+{
+	int rc;
+	rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL);
+	if (rc)
+		return rc;
+	if (!init_flag)
+		rc = get_cur_bus_info(sl);
+	return rc;
+}
+
+static int __init get_max_slots (void)
+{
+	struct slot *slot_cur;
+	struct list_head *tmp;
+	u8 slot_count = 0;
+
+	list_for_each(tmp, &ibmphp_slot_head) {
+		slot_cur = list_entry(tmp, struct slot, ibm_slot_list);
+		/* sometimes the hot-pluggable slots start with 4 (not always from 1) */
+		slot_count = max(slot_count, slot_cur->number);
+	}
+	return slot_count;
+}
+
+/* This routine will put the correct slot->device information per slot.  It's
+ * called from initialization of the slot structures. It will also assign
+ * interrupt numbers per each slot.
+ * Parameters: struct slot
+ * Returns 0 or errors
+ */
+int ibmphp_init_devno(struct slot **cur_slot)
+{
+	struct irq_routing_table *rtable;
+	int len;
+	int loop;
+	int i;
+
+	rtable = pcibios_get_irq_routing_table();
+	if (!rtable) {
+		err("no BIOS routing table...\n");
+		return -ENOMEM;
+	}
+
+	len = (rtable->size - sizeof(struct irq_routing_table)) /
+			sizeof(struct irq_info);
+
+	if (!len) {
+		kfree(rtable);
+		return -1;
+	}
+	for (loop = 0; loop < len; loop++) {
+		if ((*cur_slot)->number == rtable->slots[loop].slot &&
+		    (*cur_slot)->bus == rtable->slots[loop].bus) {
+			(*cur_slot)->device = PCI_SLOT(rtable->slots[loop].devfn);
+			for (i = 0; i < 4; i++)
+				(*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector((int) (*cur_slot)->bus,
+						(int) (*cur_slot)->device, i);
+
+			debug("(*cur_slot)->irq[0] = %x\n",
+					(*cur_slot)->irq[0]);
+			debug("(*cur_slot)->irq[1] = %x\n",
+					(*cur_slot)->irq[1]);
+			debug("(*cur_slot)->irq[2] = %x\n",
+					(*cur_slot)->irq[2]);
+			debug("(*cur_slot)->irq[3] = %x\n",
+					(*cur_slot)->irq[3]);
+
+			debug("rtable->exclusive_irqs = %x\n",
+					rtable->exclusive_irqs);
+			debug("rtable->slots[loop].irq[0].bitmap = %x\n",
+					rtable->slots[loop].irq[0].bitmap);
+			debug("rtable->slots[loop].irq[1].bitmap = %x\n",
+					rtable->slots[loop].irq[1].bitmap);
+			debug("rtable->slots[loop].irq[2].bitmap = %x\n",
+					rtable->slots[loop].irq[2].bitmap);
+			debug("rtable->slots[loop].irq[3].bitmap = %x\n",
+					rtable->slots[loop].irq[3].bitmap);
+
+			debug("rtable->slots[loop].irq[0].link = %x\n",
+					rtable->slots[loop].irq[0].link);
+			debug("rtable->slots[loop].irq[1].link = %x\n",
+					rtable->slots[loop].irq[1].link);
+			debug("rtable->slots[loop].irq[2].link = %x\n",
+					rtable->slots[loop].irq[2].link);
+			debug("rtable->slots[loop].irq[3].link = %x\n",
+					rtable->slots[loop].irq[3].link);
+			debug("end of init_devno\n");
+			kfree(rtable);
+			return 0;
+		}
+	}
+
+	kfree(rtable);
+	return -1;
+}
+
+static inline int power_on(struct slot *slot_cur)
+{
+	u8 cmd = HPC_SLOT_ON;
+	int retval;
+
+	retval = ibmphp_hpc_writeslot(slot_cur, cmd);
+	if (retval) {
+		err("power on failed\n");
+		return retval;
+	}
+	if (CTLR_RESULT(slot_cur->ctrl->status)) {
+		err("command not completed successfully in power_on\n");
+		return -EIO;
+	}
+	msleep(3000);	/* For ServeRAID cards, and some 66 PCI */
+	return 0;
+}
+
+static inline int power_off(struct slot *slot_cur)
+{
+	u8 cmd = HPC_SLOT_OFF;
+	int retval;
+
+	retval = ibmphp_hpc_writeslot(slot_cur, cmd);
+	if (retval) {
+		err("power off failed\n");
+		return retval;
+	}
+	if (CTLR_RESULT(slot_cur->ctrl->status)) {
+		err("command not completed successfully in power_off\n");
+		retval = -EIO;
+	}
+	return retval;
+}
+
+static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
+{
+	int rc = 0;
+	struct slot *pslot;
+	u8 cmd = 0x00;     /* avoid compiler warning */
+
+	debug("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n",
+			(ulong) hotplug_slot, value);
+	ibmphp_lock_operations();
+
+
+	if (hotplug_slot) {
+		switch (value) {
+		case HPC_SLOT_ATTN_OFF:
+			cmd = HPC_SLOT_ATTNOFF;
+			break;
+		case HPC_SLOT_ATTN_ON:
+			cmd = HPC_SLOT_ATTNON;
+			break;
+		case HPC_SLOT_ATTN_BLINK:
+			cmd = HPC_SLOT_BLINKLED;
+			break;
+		default:
+			rc = -ENODEV;
+			err("set_attention_status - Error : invalid input [%x]\n",
+					value);
+			break;
+		}
+		if (rc == 0) {
+			pslot = hotplug_slot->private;
+			if (pslot)
+				rc = ibmphp_hpc_writeslot(pslot, cmd);
+			else
+				rc = -ENODEV;
+		}
+	} else
+		rc = -ENODEV;
+
+	ibmphp_unlock_operations();
+
+	debug("set_attention_status - Exit rc[%d]\n", rc);
+	return rc;
+}
+
+static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	struct slot myslot;
+
+	debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
+					(ulong) hotplug_slot, (ulong) value);
+
+	ibmphp_lock_operations();
+	if (hotplug_slot) {
+		pslot = hotplug_slot->private;
+		if (pslot) {
+			memcpy(&myslot, pslot, sizeof(struct slot));
+			rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
+						&(myslot.status));
+			if (!rc)
+				rc = ibmphp_hpc_readslot(pslot,
+						READ_EXTSLOTSTATUS,
+						&(myslot.ext_status));
+			if (!rc)
+				*value = SLOT_ATTN(myslot.status,
+						myslot.ext_status);
+		}
+	}
+
+	ibmphp_unlock_operations();
+	debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value);
+	return rc;
+}
+
+static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	struct slot myslot;
+
+	debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
+					(ulong) hotplug_slot, (ulong) value);
+	ibmphp_lock_operations();
+	if (hotplug_slot) {
+		pslot = hotplug_slot->private;
+		if (pslot) {
+			memcpy(&myslot, pslot, sizeof(struct slot));
+			rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
+						&(myslot.status));
+			if (!rc)
+				*value = SLOT_LATCH(myslot.status);
+		}
+	}
+
+	ibmphp_unlock_operations();
+	debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n",
+			rc, rc, *value);
+	return rc;
+}
+
+
+static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	struct slot myslot;
+
+	debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
+					(ulong) hotplug_slot, (ulong) value);
+	ibmphp_lock_operations();
+	if (hotplug_slot) {
+		pslot = hotplug_slot->private;
+		if (pslot) {
+			memcpy(&myslot, pslot, sizeof(struct slot));
+			rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
+						&(myslot.status));
+			if (!rc)
+				*value = SLOT_PWRGD(myslot.status);
+		}
+	}
+
+	ibmphp_unlock_operations();
+	debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n",
+			rc, rc, *value);
+	return rc;
+}
+
+static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	u8 present;
+	struct slot myslot;
+
+	debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
+					(ulong) hotplug_slot, (ulong) value);
+	ibmphp_lock_operations();
+	if (hotplug_slot) {
+		pslot = hotplug_slot->private;
+		if (pslot) {
+			memcpy(&myslot, pslot, sizeof(struct slot));
+			rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
+						&(myslot.status));
+			if (!rc) {
+				present = SLOT_PRESENT(myslot.status);
+				if (present == HPC_SLOT_EMPTY)
+					*value = 0;
+				else
+					*value = 1;
+			}
+		}
+	}
+
+	ibmphp_unlock_operations();
+	debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value);
+	return rc;
+}
+
+static int get_max_bus_speed(struct slot *slot)
+{
+	int rc;
+	u8 mode = 0;
+	enum pci_bus_speed speed;
+	struct pci_bus *bus = slot->hotplug_slot->pci_slot->bus;
+
+	debug("%s - Entry slot[%p]\n", __func__, slot);
+
+	ibmphp_lock_operations();
+	mode = slot->supported_bus_mode;
+	speed = slot->supported_speed;
+	ibmphp_unlock_operations();
+
+	switch (speed) {
+	case BUS_SPEED_33:
+		break;
+	case BUS_SPEED_66:
+		if (mode == BUS_MODE_PCIX)
+			speed += 0x01;
+		break;
+	case BUS_SPEED_100:
+	case BUS_SPEED_133:
+		speed += 0x01;
+		break;
+	default:
+		/* Note (will need to change): there would be soon 256, 512 also */
+		rc = -ENODEV;
+	}
+
+	if (!rc)
+		bus->max_bus_speed = speed;
+
+	debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed);
+	return rc;
+}
+
+/*
+static int get_max_adapter_speed_1(struct hotplug_slot *hotplug_slot, u8 *value, u8 flag)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	struct slot myslot;
+
+	debug("get_max_adapter_speed_1 - Entry hotplug_slot[%lx] pvalue[%lx]\n",
+						(ulong)hotplug_slot, (ulong) value);
+
+	if (flag)
+		ibmphp_lock_operations();
+
+	if (hotplug_slot && value) {
+		pslot = hotplug_slot->private;
+		if (pslot) {
+			memcpy(&myslot, pslot, sizeof(struct slot));
+			rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
+						&(myslot.status));
+
+			if (!(SLOT_LATCH (myslot.status)) &&
+					(SLOT_PRESENT (myslot.status))) {
+				rc = ibmphp_hpc_readslot(pslot,
+						READ_EXTSLOTSTATUS,
+						&(myslot.ext_status));
+				if (!rc)
+					*value = SLOT_SPEED(myslot.ext_status);
+			} else
+				*value = MAX_ADAPTER_NONE;
+                }
+	}
+
+	if (flag)
+		ibmphp_unlock_operations();
+
+	debug("get_max_adapter_speed_1 - Exit rc[%d] value[%x]\n", rc, *value);
+	return rc;
+}
+
+static int get_bus_name(struct hotplug_slot *hotplug_slot, char *value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot = NULL;
+
+	debug("get_bus_name - Entry hotplug_slot[%lx]\n", (ulong)hotplug_slot);
+
+	ibmphp_lock_operations();
+
+	if (hotplug_slot) {
+		pslot = hotplug_slot->private;
+		if (pslot) {
+			rc = 0;
+			snprintf(value, 100, "Bus %x", pslot->bus);
+		}
+	} else
+		rc = -ENODEV;
+
+	ibmphp_unlock_operations();
+	debug("get_bus_name - Exit rc[%d] value[%x]\n", rc, *value);
+	return rc;
+}
+*/
+
+/****************************************************************************
+ * This routine will initialize the ops data structure used in the validate
+ * function. It will also power off empty slots that are powered on since BIOS
+ * leaves those on, albeit disconnected
+ ****************************************************************************/
+static int __init init_ops(void)
+{
+	struct slot *slot_cur;
+	struct list_head *tmp;
+	int retval;
+	int rc;
+
+	list_for_each(tmp, &ibmphp_slot_head) {
+		slot_cur = list_entry(tmp, struct slot, ibm_slot_list);
+
+		if (!slot_cur)
+			return -ENODEV;
+
+		debug("BEFORE GETTING SLOT STATUS, slot # %x\n",
+							slot_cur->number);
+		if (slot_cur->ctrl->revision == 0xFF)
+			if (get_ctrl_revision(slot_cur,
+						&slot_cur->ctrl->revision))
+				return -1;
+
+		if (slot_cur->bus_on->current_speed == 0xFF)
+			if (get_cur_bus_info(&slot_cur))
+				return -1;
+		get_max_bus_speed(slot_cur);
+
+		if (slot_cur->ctrl->options == 0xFF)
+			if (get_hpc_options(slot_cur, &slot_cur->ctrl->options))
+				return -1;
+
+		retval = slot_update(&slot_cur);
+		if (retval)
+			return retval;
+
+		debug("status = %x\n", slot_cur->status);
+		debug("ext_status = %x\n", slot_cur->ext_status);
+		debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status));
+		debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status));
+		debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status));
+
+		if ((SLOT_PWRGD(slot_cur->status)) &&
+		    !(SLOT_PRESENT(slot_cur->status)) &&
+		    !(SLOT_LATCH(slot_cur->status))) {
+			debug("BEFORE POWER OFF COMMAND\n");
+				rc = power_off(slot_cur);
+				if (rc)
+					return rc;
+
+	/*		retval = slot_update(&slot_cur);
+	 *		if (retval)
+	 *			return retval;
+	 *		ibmphp_update_slot_info(slot_cur);
+	 */
+		}
+	}
+	init_flag = 0;
+	return 0;
+}
+
+/* This operation will check whether the slot is within the bounds and
+ * the operation is valid to perform on that slot
+ * Parameters: slot, operation
+ * Returns: 0 or error codes
+ */
+static int validate(struct slot *slot_cur, int opn)
+{
+	int number;
+	int retval;
+
+	if (!slot_cur)
+		return -ENODEV;
+	number = slot_cur->number;
+	if ((number > max_slots) || (number < 0))
+		return -EBADSLT;
+	debug("slot_number in validate is %d\n", slot_cur->number);
+
+	retval = slot_update(&slot_cur);
+	if (retval)
+		return retval;
+
+	switch (opn) {
+		case ENABLE:
+			if (!(SLOT_PWRGD(slot_cur->status)) &&
+			     (SLOT_PRESENT(slot_cur->status)) &&
+			     !(SLOT_LATCH(slot_cur->status)))
+				return 0;
+			break;
+		case DISABLE:
+			if ((SLOT_PWRGD(slot_cur->status)) &&
+			    (SLOT_PRESENT(slot_cur->status)) &&
+			    !(SLOT_LATCH(slot_cur->status)))
+				return 0;
+			break;
+		default:
+			break;
+	}
+	err("validate failed....\n");
+	return -EINVAL;
+}
+
+/****************************************************************************
+ * This routine is for updating the data structures in the hotplug core
+ * Parameters: struct slot
+ * Returns: 0 or error
+ ****************************************************************************/
+int ibmphp_update_slot_info(struct slot *slot_cur)
+{
+	struct hotplug_slot_info *info;
+	struct pci_bus *bus = slot_cur->hotplug_slot->pci_slot->bus;
+	int rc;
+	u8 bus_speed;
+	u8 mode;
+
+	info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
+	if (!info) {
+		err("out of system memory\n");
+		return -ENOMEM;
+	}
+
+	info->power_status = SLOT_PWRGD(slot_cur->status);
+	info->attention_status = SLOT_ATTN(slot_cur->status,
+						slot_cur->ext_status);
+	info->latch_status = SLOT_LATCH(slot_cur->status);
+        if (!SLOT_PRESENT(slot_cur->status)) {
+                info->adapter_status = 0;
+/*		info->max_adapter_speed_status = MAX_ADAPTER_NONE; */
+	} else {
+                info->adapter_status = 1;
+/*		get_max_adapter_speed_1(slot_cur->hotplug_slot,
+					&info->max_adapter_speed_status, 0); */
+	}
+
+	bus_speed = slot_cur->bus_on->current_speed;
+	mode = slot_cur->bus_on->current_bus_mode;
+
+	switch (bus_speed) {
+		case BUS_SPEED_33:
+			break;
+		case BUS_SPEED_66:
+			if (mode == BUS_MODE_PCIX)
+				bus_speed += 0x01;
+			else if (mode == BUS_MODE_PCI)
+				;
+			else
+				bus_speed = PCI_SPEED_UNKNOWN;
+			break;
+		case BUS_SPEED_100:
+		case BUS_SPEED_133:
+			bus_speed += 0x01;
+			break;
+		default:
+			bus_speed = PCI_SPEED_UNKNOWN;
+	}
+
+	bus->cur_bus_speed = bus_speed;
+	// To do: bus_names
+
+	rc = pci_hp_change_slot_info(slot_cur->hotplug_slot, info);
+	kfree(info);
+	return rc;
+}
+
+
+/******************************************************************************
+ * This function will return the pci_func, given bus and devfunc, or NULL.  It
+ * is called from visit routines
+ ******************************************************************************/
+
+static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function)
+{
+	struct pci_func *func_cur;
+	struct slot *slot_cur;
+	struct list_head *tmp;
+	list_for_each(tmp, &ibmphp_slot_head) {
+		slot_cur = list_entry(tmp, struct slot, ibm_slot_list);
+		if (slot_cur->func) {
+			func_cur = slot_cur->func;
+			while (func_cur) {
+				if ((func_cur->busno == busno) &&
+						(func_cur->device == device) &&
+						(func_cur->function == function))
+					return func_cur;
+				func_cur = func_cur->next;
+			}
+		}
+	}
+	return NULL;
+}
+
+/*************************************************************
+ * This routine frees up memory used by struct slot, including
+ * the pointers to pci_func, bus, hotplug_slot, controller,
+ * and deregistering from the hotplug core
+ *************************************************************/
+static void free_slots(void)
+{
+	struct slot *slot_cur;
+	struct list_head *tmp;
+	struct list_head *next;
+
+	debug("%s -- enter\n", __func__);
+
+	list_for_each_safe(tmp, next, &ibmphp_slot_head) {
+		slot_cur = list_entry(tmp, struct slot, ibm_slot_list);
+		pci_hp_deregister(slot_cur->hotplug_slot);
+	}
+	debug("%s -- exit\n", __func__);
+}
+
+static void ibm_unconfigure_device(struct pci_func *func)
+{
+	struct pci_dev *temp;
+	u8 j;
+
+	debug("inside %s\n", __func__);
+	debug("func->device = %x, func->function = %x\n",
+					func->device, func->function);
+	debug("func->device << 3 | 0x0  = %x\n", func->device << 3 | 0x0);
+
+	pci_lock_rescan_remove();
+
+	for (j = 0; j < 0x08; j++) {
+		temp = pci_get_bus_and_slot(func->busno, (func->device << 3) | j);
+		if (temp) {
+			pci_stop_and_remove_bus_device(temp);
+			pci_dev_put(temp);
+		}
+	}
+
+	pci_dev_put(func->dev);
+
+	pci_unlock_rescan_remove();
+}
+
+/*
+ * The following function is to fix kernel bug regarding
+ * getting bus entries, here we manually add those primary
+ * bus entries to kernel bus structure whenever apply
+ */
+static u8 bus_structure_fixup(u8 busno)
+{
+	struct pci_bus *bus, *b;
+	struct pci_dev *dev;
+	u16 l;
+
+	if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno)))
+		return 1;
+
+	bus = kmalloc(sizeof(*bus), GFP_KERNEL);
+	if (!bus) {
+		err("%s - out of memory\n", __func__);
+		return 1;
+	}
+	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev) {
+		kfree(bus);
+		err("%s - out of memory\n", __func__);
+		return 1;
+	}
+
+	bus->number = busno;
+	bus->ops = ibmphp_pci_bus->ops;
+	dev->bus = bus;
+	for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) {
+		if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) &&
+					(l != 0x0000) && (l != 0xffff)) {
+			debug("%s - Inside bus_structure_fixup()\n",
+							__func__);
+			b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
+			if (!b)
+				continue;
+
+			pci_bus_add_devices(b);
+			break;
+		}
+	}
+
+	kfree(dev);
+	kfree(bus);
+
+	return 0;
+}
+
+static int ibm_configure_device(struct pci_func *func)
+{
+	struct pci_bus *child;
+	int num;
+	int flag = 0;	/* this is to make sure we don't double scan the bus,
+					for bridged devices primarily */
+
+	pci_lock_rescan_remove();
+
+	if (!(bus_structure_fixup(func->busno)))
+		flag = 1;
+	if (func->dev == NULL)
+		func->dev = pci_get_bus_and_slot(func->busno,
+				PCI_DEVFN(func->device, func->function));
+
+	if (func->dev == NULL) {
+		struct pci_bus *bus = pci_find_bus(0, func->busno);
+		if (!bus)
+			goto out;
+
+		num = pci_scan_slot(bus,
+				PCI_DEVFN(func->device, func->function));
+		if (num)
+			pci_bus_add_devices(bus);
+
+		func->dev = pci_get_bus_and_slot(func->busno,
+				PCI_DEVFN(func->device, func->function));
+		if (func->dev == NULL) {
+			err("ERROR... : pci_dev still NULL\n");
+			goto out;
+		}
+	}
+	if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
+		pci_hp_add_bridge(func->dev);
+		child = func->dev->subordinate;
+		if (child)
+			pci_bus_add_devices(child);
+	}
+
+ out:
+	pci_unlock_rescan_remove();
+	return 0;
+}
+
+/*******************************************************
+ * Returns whether the bus is empty or not
+ *******************************************************/
+static int is_bus_empty(struct slot *slot_cur)
+{
+	int rc;
+	struct slot *tmp_slot;
+	u8 i = slot_cur->bus_on->slot_min;
+
+	while (i <= slot_cur->bus_on->slot_max) {
+		if (i == slot_cur->number) {
+			i++;
+			continue;
+		}
+		tmp_slot = ibmphp_get_slot_from_physical_num(i);
+		if (!tmp_slot)
+			return 0;
+		rc = slot_update(&tmp_slot);
+		if (rc)
+			return 0;
+		if (SLOT_PRESENT(tmp_slot->status) &&
+					SLOT_PWRGD(tmp_slot->status))
+			return 0;
+		i++;
+	}
+	return 1;
+}
+
+/***********************************************************
+ * If the HPC permits and the bus currently empty, tries to set the
+ * bus speed and mode at the maximum card and bus capability
+ * Parameters: slot
+ * Returns: bus is set (0) or error code
+ ***********************************************************/
+static int set_bus(struct slot *slot_cur)
+{
+	int rc;
+	u8 speed;
+	u8 cmd = 0x0;
+	int retval;
+	static struct pci_device_id ciobx[] = {
+		{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) },
+	        { },
+	};
+
+	debug("%s - entry slot # %d\n", __func__, slot_cur->number);
+	if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) {
+		rc = slot_update(&slot_cur);
+		if (rc)
+			return rc;
+		speed = SLOT_SPEED(slot_cur->ext_status);
+		debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed);
+		switch (speed) {
+		case HPC_SLOT_SPEED_33:
+			cmd = HPC_BUS_33CONVMODE;
+			break;
+		case HPC_SLOT_SPEED_66:
+			if (SLOT_PCIX(slot_cur->ext_status)) {
+				if ((slot_cur->supported_speed >= BUS_SPEED_66) &&
+						(slot_cur->supported_bus_mode == BUS_MODE_PCIX))
+					cmd = HPC_BUS_66PCIXMODE;
+				else if (!SLOT_BUS_MODE(slot_cur->ext_status))
+					/* if max slot/bus capability is 66 pci
+					and there's no bus mode mismatch, then
+					the adapter supports 66 pci */
+					cmd = HPC_BUS_66CONVMODE;
+				else
+					cmd = HPC_BUS_33CONVMODE;
+			} else {
+				if (slot_cur->supported_speed >= BUS_SPEED_66)
+					cmd = HPC_BUS_66CONVMODE;
+				else
+					cmd = HPC_BUS_33CONVMODE;
+			}
+			break;
+		case HPC_SLOT_SPEED_133:
+			switch (slot_cur->supported_speed) {
+			case BUS_SPEED_33:
+				cmd = HPC_BUS_33CONVMODE;
+				break;
+			case BUS_SPEED_66:
+				if (slot_cur->supported_bus_mode == BUS_MODE_PCIX)
+					cmd = HPC_BUS_66PCIXMODE;
+				else
+					cmd = HPC_BUS_66CONVMODE;
+				break;
+			case BUS_SPEED_100:
+				cmd = HPC_BUS_100PCIXMODE;
+				break;
+			case BUS_SPEED_133:
+				/* This is to take care of the bug in CIOBX chip */
+				if (pci_dev_present(ciobx))
+					ibmphp_hpc_writeslot(slot_cur,
+							HPC_BUS_100PCIXMODE);
+				cmd = HPC_BUS_133PCIXMODE;
+				break;
+			default:
+				err("Wrong bus speed\n");
+				return -ENODEV;
+			}
+			break;
+		default:
+			err("wrong slot speed\n");
+			return -ENODEV;
+		}
+		debug("setting bus speed for slot %d, cmd %x\n",
+						slot_cur->number, cmd);
+		retval = ibmphp_hpc_writeslot(slot_cur, cmd);
+		if (retval) {
+			err("setting bus speed failed\n");
+			return retval;
+		}
+		if (CTLR_RESULT(slot_cur->ctrl->status)) {
+			err("command not completed successfully in set_bus\n");
+			return -EIO;
+		}
+	}
+	/* This is for x440, once Brandon fixes the firmware,
+	will not need this delay */
+	msleep(1000);
+	debug("%s -Exit\n", __func__);
+	return 0;
+}
+
+/* This routine checks the bus limitations that the slot is on from the BIOS.
+ * This is used in deciding whether or not to power up the slot.
+ * (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on
+ * same bus)
+ * Parameters: slot
+ * Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus
+ */
+static int check_limitations(struct slot *slot_cur)
+{
+	u8 i;
+	struct slot *tmp_slot;
+	u8 count = 0;
+	u8 limitation = 0;
+
+	for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) {
+		tmp_slot = ibmphp_get_slot_from_physical_num(i);
+		if (!tmp_slot)
+			return -ENODEV;
+		if ((SLOT_PWRGD(tmp_slot->status)) &&
+					!(SLOT_CONNECT(tmp_slot->status)))
+			count++;
+	}
+	get_cur_bus_info(&slot_cur);
+	switch (slot_cur->bus_on->current_speed) {
+	case BUS_SPEED_33:
+		limitation = slot_cur->bus_on->slots_at_33_conv;
+		break;
+	case BUS_SPEED_66:
+		if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX)
+			limitation = slot_cur->bus_on->slots_at_66_pcix;
+		else
+			limitation = slot_cur->bus_on->slots_at_66_conv;
+		break;
+	case BUS_SPEED_100:
+		limitation = slot_cur->bus_on->slots_at_100_pcix;
+		break;
+	case BUS_SPEED_133:
+		limitation = slot_cur->bus_on->slots_at_133_pcix;
+		break;
+	}
+
+	if ((count + 1) > limitation)
+		return -EINVAL;
+	return 0;
+}
+
+static inline void print_card_capability(struct slot *slot_cur)
+{
+	info("capability of the card is ");
+	if ((slot_cur->ext_status & CARD_INFO) == PCIX133)
+		info("   133 MHz PCI-X\n");
+	else if ((slot_cur->ext_status & CARD_INFO) == PCIX66)
+		info("    66 MHz PCI-X\n");
+	else if ((slot_cur->ext_status & CARD_INFO) == PCI66)
+		info("    66 MHz PCI\n");
+	else
+		info("    33 MHz PCI\n");
+
+}
+
+/* This routine will power on the slot, configure the device(s) and find the
+ * drivers for them.
+ * Parameters: hotplug_slot
+ * Returns: 0 or failure codes
+ */
+static int enable_slot(struct hotplug_slot *hs)
+{
+	int rc, i, rcpr;
+	struct slot *slot_cur;
+	u8 function;
+	struct pci_func *tmp_func;
+
+	ibmphp_lock_operations();
+
+	debug("ENABLING SLOT........\n");
+	slot_cur = hs->private;
+
+	rc = validate(slot_cur, ENABLE);
+	if (rc) {
+		err("validate function failed\n");
+		goto error_nopower;
+	}
+
+	attn_LED_blink(slot_cur);
+
+	rc = set_bus(slot_cur);
+	if (rc) {
+		err("was not able to set the bus\n");
+		goto error_nopower;
+	}
+
+	/*-----------------debugging------------------------------*/
+	get_cur_bus_info(&slot_cur);
+	debug("the current bus speed right after set_bus = %x\n",
+					slot_cur->bus_on->current_speed);
+	/*----------------------------------------------------------*/
+
+	rc = check_limitations(slot_cur);
+	if (rc) {
+		err("Adding this card exceeds the limitations of this bus.\n");
+		err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n");
+		err("Try hot-adding into another bus\n");
+		rc = -EINVAL;
+		goto error_nopower;
+	}
+
+	rc = power_on(slot_cur);
+
+	if (rc) {
+		err("something wrong when powering up... please see below for details\n");
+		/* need to turn off before on, otherwise, blinking overwrites */
+		attn_off(slot_cur);
+		attn_on(slot_cur);
+		if (slot_update(&slot_cur)) {
+			attn_off(slot_cur);
+			attn_on(slot_cur);
+			rc = -ENODEV;
+			goto exit;
+		}
+		/* Check to see the error of why it failed */
+		if ((SLOT_POWER(slot_cur->status)) &&
+					!(SLOT_PWRGD(slot_cur->status)))
+			err("power fault occurred trying to power up\n");
+		else if (SLOT_BUS_SPEED(slot_cur->status)) {
+			err("bus speed mismatch occurred.  please check current bus speed and card capability\n");
+			print_card_capability(slot_cur);
+		} else if (SLOT_BUS_MODE(slot_cur->ext_status)) {
+			err("bus mode mismatch occurred.  please check current bus mode and card capability\n");
+			print_card_capability(slot_cur);
+		}
+		ibmphp_update_slot_info(slot_cur);
+		goto exit;
+	}
+	debug("after power_on\n");
+	/*-----------------------debugging---------------------------*/
+	get_cur_bus_info(&slot_cur);
+	debug("the current bus speed right after power_on = %x\n",
+					slot_cur->bus_on->current_speed);
+	/*----------------------------------------------------------*/
+
+	rc = slot_update(&slot_cur);
+	if (rc)
+		goto error_power;
+
+	rc = -EINVAL;
+	if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) {
+		err("power fault occurred trying to power up...\n");
+		goto error_power;
+	}
+	if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) {
+		err("bus speed mismatch occurred.  please check current bus speed and card capability\n");
+		print_card_capability(slot_cur);
+		goto error_power;
+	}
+	/* Don't think this case will happen after above checks...
+	 * but just in case, for paranoia sake */
+	if (!(SLOT_POWER(slot_cur->status))) {
+		err("power on failed...\n");
+		goto error_power;
+	}
+
+	slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
+	if (!slot_cur->func) {
+		/* We cannot do update_slot_info here, since no memory for
+		 * kmalloc n.e.ways, and update_slot_info allocates some */
+		err("out of system memory\n");
+		rc = -ENOMEM;
+		goto error_power;
+	}
+	slot_cur->func->busno = slot_cur->bus;
+	slot_cur->func->device = slot_cur->device;
+	for (i = 0; i < 4; i++)
+		slot_cur->func->irq[i] = slot_cur->irq[i];
+
+	debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n",
+					slot_cur->bus, slot_cur->device);
+
+	if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) {
+		err("configure_card was unsuccessful...\n");
+		/* true because don't need to actually deallocate resources,
+		 * just remove references */
+		ibmphp_unconfigure_card(&slot_cur, 1);
+		debug("after unconfigure_card\n");
+		slot_cur->func = NULL;
+		rc = -ENOMEM;
+		goto error_power;
+	}
+
+	function = 0x00;
+	do {
+		tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device,
+							function++);
+		if (tmp_func && !(tmp_func->dev))
+			ibm_configure_device(tmp_func);
+	} while (tmp_func);
+
+	attn_off(slot_cur);
+	if (slot_update(&slot_cur)) {
+		rc = -EFAULT;
+		goto exit;
+	}
+	ibmphp_print_test();
+	rc = ibmphp_update_slot_info(slot_cur);
+exit:
+	ibmphp_unlock_operations();
+	return rc;
+
+error_nopower:
+	attn_off(slot_cur);	/* need to turn off if was blinking b4 */
+	attn_on(slot_cur);
+error_cont:
+	rcpr = slot_update(&slot_cur);
+	if (rcpr) {
+		rc = rcpr;
+		goto exit;
+	}
+	ibmphp_update_slot_info(slot_cur);
+	goto exit;
+
+error_power:
+	attn_off(slot_cur);	/* need to turn off if was blinking b4 */
+	attn_on(slot_cur);
+	rcpr = power_off(slot_cur);
+	if (rcpr) {
+		rc = rcpr;
+		goto exit;
+	}
+	goto error_cont;
+}
+
+/**************************************************************
+* HOT REMOVING ADAPTER CARD                                   *
+* INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE                *
+* OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE         *
+          DISABLE POWER ,                                    *
+**************************************************************/
+static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot)
+{
+	struct slot *slot = hotplug_slot->private;
+	int rc;
+
+	ibmphp_lock_operations();
+	rc = ibmphp_do_disable_slot(slot);
+	ibmphp_unlock_operations();
+	return rc;
+}
+
+int ibmphp_do_disable_slot(struct slot *slot_cur)
+{
+	int rc;
+	u8 flag;
+
+	debug("DISABLING SLOT...\n");
+
+	if ((slot_cur == NULL) || (slot_cur->ctrl == NULL))
+		return -ENODEV;
+
+	flag = slot_cur->flag;
+	slot_cur->flag = 1;
+
+	if (flag == 1) {
+		rc = validate(slot_cur, DISABLE);
+			/* checking if powered off already & valid slot # */
+		if (rc)
+			goto error;
+	}
+	attn_LED_blink(slot_cur);
+
+	if (slot_cur->func == NULL) {
+		/* We need this for functions that were there on bootup */
+		slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
+		if (!slot_cur->func) {
+			err("out of system memory\n");
+			rc = -ENOMEM;
+			goto error;
+		}
+		slot_cur->func->busno = slot_cur->bus;
+		slot_cur->func->device = slot_cur->device;
+	}
+
+	ibm_unconfigure_device(slot_cur->func);
+
+	/*
+	 * If we got here from latch suddenly opening on operating card or
+	 * a power fault, there's no power to the card, so cannot
+	 * read from it to determine what resources it occupied.  This operation
+	 * is forbidden anyhow.  The best we can do is remove it from kernel
+	 * lists at least */
+
+	if (!flag) {
+		attn_off(slot_cur);
+		return 0;
+	}
+
+	rc = ibmphp_unconfigure_card(&slot_cur, 0);
+	slot_cur->func = NULL;
+	debug("in disable_slot. after unconfigure_card\n");
+	if (rc) {
+		err("could not unconfigure card.\n");
+		goto error;
+	}
+
+	rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF);
+	if (rc)
+		goto error;
+
+	attn_off(slot_cur);
+	rc = slot_update(&slot_cur);
+	if (rc)
+		goto exit;
+
+	rc = ibmphp_update_slot_info(slot_cur);
+	ibmphp_print_test();
+exit:
+	return rc;
+
+error:
+	/*  Need to turn off if was blinking b4 */
+	attn_off(slot_cur);
+	attn_on(slot_cur);
+	if (slot_update(&slot_cur)) {
+		rc = -EFAULT;
+		goto exit;
+	}
+	if (flag)
+		ibmphp_update_slot_info(slot_cur);
+	goto exit;
+}
+
+struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
+	.set_attention_status =		set_attention_status,
+	.enable_slot =			enable_slot,
+	.disable_slot =			ibmphp_disable_slot,
+	.hardware_test =		NULL,
+	.get_power_status =		get_power_status,
+	.get_attention_status =		get_attention_status,
+	.get_latch_status =		get_latch_status,
+	.get_adapter_status =		get_adapter_present,
+/*	.get_max_adapter_speed =	get_max_adapter_speed,
+	.get_bus_name_status =		get_bus_name,
+*/
+};
+
+static void ibmphp_unload(void)
+{
+	free_slots();
+	debug("after slots\n");
+	ibmphp_free_resources();
+	debug("after resources\n");
+	ibmphp_free_bus_info_queue();
+	debug("after bus info\n");
+	ibmphp_free_ebda_hpc_queue();
+	debug("after ebda hpc\n");
+	ibmphp_free_ebda_pci_rsrc_queue();
+	debug("after ebda pci rsrc\n");
+	kfree(ibmphp_pci_bus);
+}
+
+static int __init ibmphp_init(void)
+{
+	struct pci_bus *bus;
+	int i = 0;
+	int rc = 0;
+
+	init_flag = 1;
+
+	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+
+	ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL);
+	if (!ibmphp_pci_bus) {
+		err("out of memory\n");
+		rc = -ENOMEM;
+		goto exit;
+	}
+
+	bus = pci_find_bus(0, 0);
+	if (!bus) {
+		err("Can't find the root pci bus, can not continue\n");
+		rc = -ENODEV;
+		goto error;
+	}
+	memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
+
+	ibmphp_debug = debug;
+
+	ibmphp_hpc_initvars();
+
+	for (i = 0; i < 16; i++)
+		irqs[i] = 0;
+
+	rc = ibmphp_access_ebda();
+	if (rc)
+		goto error;
+	debug("after ibmphp_access_ebda()\n");
+
+	rc = ibmphp_rsrc_init();
+	if (rc)
+		goto error;
+	debug("AFTER Resource & EBDA INITIALIZATIONS\n");
+
+	max_slots = get_max_slots();
+
+	rc = ibmphp_register_pci();
+	if (rc)
+		goto error;
+
+	if (init_ops()) {
+		rc = -ENODEV;
+		goto error;
+	}
+
+	ibmphp_print_test();
+	rc = ibmphp_hpc_start_poll_thread();
+	if (rc)
+		goto error;
+
+exit:
+	return rc;
+
+error:
+	ibmphp_unload();
+	goto exit;
+}
+
+static void __exit ibmphp_exit(void)
+{
+	ibmphp_hpc_stop_poll_thread();
+	debug("after polling\n");
+	ibmphp_unload();
+	debug("done\n");
+}
+
+module_init(ibmphp_init);
+module_exit(ibmphp_exit);