Altix: Add initial ACPI IO support

First phase in introducing ACPI support to SN.
In this phase, when running with an ACPI capable PROM,
the DSDT will define the root busses and all SN nodes
(SGIHUB, SGITIO). An ACPI bus driver will be registered
for the node devices, with the acpi_pci_root_driver being
used for the root busses. An ACPI vendor descriptor is
now used to pass platform specific information for both
nodes and busses, eliminating the need for the current
SAL calls. Also, with ACPI support, SN fixup code is no longer
needed to initiate the PCI bus scans, as the acpi_pci_root_driver
does that.

However, to maintain backward compatibility with non-ACPI capable
PROMs, none of the current 'fixup' code can been deleted, though
much restructuring has been done. For example, the bulk of the code
in io_common.c is relocated code that is now common regardless
of what PROM is running, while io_acpi_init.c and io_init.c contain
routines specific to an ACPI or non ACPI capable PROM respectively.

A new pci bus fixup platform vector has been created to provide
a hook for invoking platform specific bus fixup from pcibios_fixup_bus().

The size of io_space[] has been increased to support systems with
large IO configurations.


Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 101 insertions, 529 deletions

diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index dc09a6a28a3..990224a4412 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -3,103 +3,28 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 1992 - 1997, 2000-2005 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 1992 - 1997, 2000-2006 Silicon Graphics, Inc. All rights reserved.
  */
 
-#include <linux/bootmem.h>
-#include <linux/nodemask.h>
 #include <asm/sn/types.h>
 #include <asm/sn/addrs.h>
-#include <asm/sn/sn_feature_sets.h>
-#include <asm/sn/geo.h>
 #include <asm/sn/io.h>
-#include <asm/sn/l1.h>
 #include <asm/sn/module.h>
-#include <asm/sn/pcibr_provider.h>
+#include <asm/sn/intr.h>
 #include <asm/sn/pcibus_provider_defs.h>
 #include <asm/sn/pcidev.h>
-#include <asm/sn/simulator.h>
 #include <asm/sn/sn_sal.h>
-#include <asm/sn/tioca_provider.h>
-#include <asm/sn/tioce_provider.h>
 #include "xtalk/hubdev.h"
-#include "xtalk/xwidgetdev.h"
-
-
-extern void sn_init_cpei_timer(void);
-extern void register_sn_procfs(void);
-
-static struct list_head sn_sysdata_list;
-
-/* sysdata list struct */
-struct sysdata_el {
-	struct list_head entry;
-	void *sysdata;
-};
-
-struct slab_info {
-	struct hubdev_info hubdev;
-};
-
-struct brick {
-	moduleid_t id;		/* Module ID of this module        */
-	struct slab_info slab_info[MAX_SLABS + 1];
-};
-
-int sn_ioif_inited;		/* SN I/O infrastructure initialized? */
-
-struct sn_pcibus_provider *sn_pci_provider[PCIIO_ASIC_MAX_TYPES];	/* indexed by asic type */
-
-static int max_segment_number;		 /* Default highest segment number */
-static int max_pcibus_number = 255;	/* Default highest pci bus number */
 
 /*
- * Hooks and struct for unsupported pci providers
+ * The code in this file will only be executed when running with
+ * a PROM that does _not_ have base ACPI IO support.
+ * (i.e., SN_ACPI_BASE_SUPPORT() == 0)
  */
 
-static dma_addr_t
-sn_default_pci_map(struct pci_dev *pdev, unsigned long paddr, size_t size, int type)
-{
-	return 0;
-}
-
-static void
-sn_default_pci_unmap(struct pci_dev *pdev, dma_addr_t addr, int direction)
-{
-	return;
-}
-
-static void *
-sn_default_pci_bus_fixup(struct pcibus_bussoft *soft, struct pci_controller *controller)
-{
-	return NULL;
-}
-
-static struct sn_pcibus_provider sn_pci_default_provider = {
-	.dma_map = sn_default_pci_map,
-	.dma_map_consistent = sn_default_pci_map,
-	.dma_unmap = sn_default_pci_unmap,
-	.bus_fixup = sn_default_pci_bus_fixup,
-};
-
-/*
- * Retrieve the DMA Flush List given nasid, widget, and device.
- * This list is needed to implement the WAR - Flush DMA data on PIO Reads.
- */
-static inline u64
-sal_get_device_dmaflush_list(u64 nasid, u64 widget_num, u64 device_num,
-			     u64 address)
-{
-	struct ia64_sal_retval ret_stuff;
-	ret_stuff.status = 0;
-	ret_stuff.v0 = 0;
+static int max_segment_number;		 /* Default highest segment number */
+static int max_pcibus_number = 255;	/* Default highest pci bus number */
 
-	SAL_CALL_NOLOCK(ret_stuff,
-			(u64) SN_SAL_IOIF_GET_DEVICE_DMAFLUSH_LIST,
-			(u64) nasid, (u64) widget_num,
-			(u64) device_num, (u64) address, 0, 0, 0);
-	return ret_stuff.status;
-}
 
 /*
  * Retrieve the hub device info structure for the given nasid.
@@ -131,93 +56,20 @@ static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
 	return ret_stuff.v0;
 }
 
-/*
- * Retrieve the pci device information given the bus and device|function number.
- */
-static inline u64
-sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
-		    u64 sn_irq_info)
-{
-	struct ia64_sal_retval ret_stuff;
-	ret_stuff.status = 0;
-	ret_stuff.v0 = 0;
-
-	SAL_CALL_NOLOCK(ret_stuff,
-			(u64) SN_SAL_IOIF_GET_PCIDEV_INFO,
-			(u64) segment, (u64) bus_number, (u64) devfn,
-			(u64) pci_dev,
-			sn_irq_info, 0, 0);
-	return ret_stuff.v0;
-}
-
-/*
- * sn_pcidev_info_get() - Retrieve the pcidev_info struct for the specified
- *			  device.
- */
-inline struct pcidev_info *
-sn_pcidev_info_get(struct pci_dev *dev)
-{
-	struct pcidev_info *pcidev;
-
-	list_for_each_entry(pcidev,
-			    &(SN_PCI_CONTROLLER(dev)->pcidev_info), pdi_list) {
-		if (pcidev->pdi_linux_pcidev == dev) {
-			return pcidev;
-		}
-	}
-	return NULL;
-}
-
-/* Older PROM flush WAR
- *
- * 01/16/06 -- This war will be in place until a new official PROM is released.
- * Additionally note that the struct sn_flush_device_war also has to be
- * removed from arch/ia64/sn/include/xtalk/hubdev.h
- */
-static u8 war_implemented = 0;
-
-static s64 sn_device_fixup_war(u64 nasid, u64 widget, int device,
-			       struct sn_flush_device_common *common)
-{
-	struct sn_flush_device_war *war_list;
-	struct sn_flush_device_war *dev_entry;
-	struct ia64_sal_retval isrv = {0,0,0,0};
-
-	if (!war_implemented) {
-		printk(KERN_WARNING "PROM version < 4.50 -- implementing old "
-		       "PROM flush WAR\n");
-		war_implemented = 1;
-	}
-
-	war_list = kzalloc(DEV_PER_WIDGET * sizeof(*war_list), GFP_KERNEL);
-	if (!war_list)
-		BUG();
-
-	SAL_CALL_NOLOCK(isrv, SN_SAL_IOIF_GET_WIDGET_DMAFLUSH_LIST,
-			nasid, widget, __pa(war_list), 0, 0, 0 ,0);
-	if (isrv.status)
-		panic("sn_device_fixup_war failed: %s\n",
-		      ia64_sal_strerror(isrv.status));
-
-	dev_entry = war_list + device;
-	memcpy(common,dev_entry, sizeof(*common));
-	kfree(war_list);
-
-	return isrv.status;
-}
 
 /*
- * sn_fixup_ionodes() - This routine initializes the HUB data strcuture for
- *	each node in the system.
+ * sn_fixup_ionodes() - This routine initializes the HUB data structure for
+ *			each node in the system. This function is only
+ *			executed when running with a non-ACPI capable PROM.
  */
 static void __init sn_fixup_ionodes(void)
 {
-	struct sn_flush_device_kernel *sn_flush_device_kernel;
-	struct sn_flush_device_kernel *dev_entry;
+
 	struct hubdev_info *hubdev;
 	u64 status;
 	u64 nasid;
-	int i, widget, device, size;
+	int i;
+	extern void sn_common_hubdev_init(struct hubdev_info *);
 
 	/*
 	 * Get SGI Specific HUB chipset information.
@@ -240,70 +92,47 @@ static void __init sn_fixup_ionodes(void)
 			max_segment_number = hubdev->max_segment_number;
 			max_pcibus_number = hubdev->max_pcibus_number;
 		}
+		sn_common_hubdev_init(hubdev);
+	}
+}
 
-		/* Attach the error interrupt handlers */
-		if (nasid & 1)
-			ice_error_init(hubdev);
-		else
-			hub_error_init(hubdev);
-
-		for (widget = 0; widget <= HUB_WIDGET_ID_MAX; widget++)
-			hubdev->hdi_xwidget_info[widget].xwi_hubinfo = hubdev;
-
-		if (!hubdev->hdi_flush_nasid_list.widget_p)
-			continue;
-
-		size = (HUB_WIDGET_ID_MAX + 1) *
-			sizeof(struct sn_flush_device_kernel *);
-		hubdev->hdi_flush_nasid_list.widget_p =
-			kzalloc(size, GFP_KERNEL);
-		if (!hubdev->hdi_flush_nasid_list.widget_p)
+/*
+ * sn_pci_legacy_window_fixup - Create PCI controller windows for
+ *				legacy IO and MEM space. This needs to
+ *				be done here, as the PROM does not have
+ *				ACPI support defining the root buses
+ *				and their resources (_CRS),
+ */
+static void
+sn_legacy_pci_window_fixup(struct pci_controller *controller,
+			   u64 legacy_io, u64 legacy_mem)
+{
+		controller->window = kcalloc(2, sizeof(struct pci_window),
+					     GFP_KERNEL);
+		if (controller->window == NULL)
 			BUG();
-
-		for (widget = 0; widget <= HUB_WIDGET_ID_MAX; widget++) {
-			size = DEV_PER_WIDGET *
-				sizeof(struct sn_flush_device_kernel);
-			sn_flush_device_kernel = kzalloc(size, GFP_KERNEL);
-			if (!sn_flush_device_kernel)
-				BUG();
-
-			dev_entry = sn_flush_device_kernel;
-			for (device = 0; device < DEV_PER_WIDGET;
-			     device++,dev_entry++) {
-				size = sizeof(struct sn_flush_device_common);
-				dev_entry->common = kzalloc(size, GFP_KERNEL);
-				if (!dev_entry->common)
-					BUG();
-
-				if (sn_prom_feature_available(
-						       PRF_DEVICE_FLUSH_LIST))
-					status = sal_get_device_dmaflush_list(
-						     nasid, widget, device,
-						     (u64)(dev_entry->common));
-				else
-					status = sn_device_fixup_war(nasid,
-						     widget, device,
-						     dev_entry->common);
-				if (status != SALRET_OK)
-					panic("SAL call failed: %s\n",
-					      ia64_sal_strerror(status));
-
-				spin_lock_init(&dev_entry->sfdl_flush_lock);
-			}
-
-			if (sn_flush_device_kernel)
-				hubdev->hdi_flush_nasid_list.widget_p[widget] =
-						       sn_flush_device_kernel;
-	        }
-	}
+		controller->window[0].offset = legacy_io;
+		controller->window[0].resource.name = "legacy_io";
+		controller->window[0].resource.flags = IORESOURCE_IO;
+		controller->window[0].resource.start = legacy_io;
+		controller->window[0].resource.end =
+	    			controller->window[0].resource.start + 0xffff;
+		controller->window[0].resource.parent = &ioport_resource;
+		controller->window[1].offset = legacy_mem;
+		controller->window[1].resource.name = "legacy_mem";
+		controller->window[1].resource.flags = IORESOURCE_MEM;
+		controller->window[1].resource.start = legacy_mem;
+		controller->window[1].resource.end =
+	    	       controller->window[1].resource.start + (1024 * 1024) - 1;
+		controller->window[1].resource.parent = &iomem_resource;
+		controller->windows = 2;
 }
 
 /*
  * sn_pci_window_fixup() - Create a pci_window for each device resource.
- *			   Until ACPI support is added, we need this code
- *			   to setup pci_windows for use by
- *			   pcibios_bus_to_resource(),
- *			   pcibios_resource_to_bus(), etc.
+ *			   It will setup pci_windows for use by
+ *			   pcibios_bus_to_resource(), pcibios_resource_to_bus(),
+ *			   etc.
  */
 static void
 sn_pci_window_fixup(struct pci_dev *dev, unsigned int count,
@@ -342,60 +171,22 @@ sn_pci_window_fixup(struct pci_dev *dev, unsigned int count,
 	controller->window = new_window;
 }
 
-void sn_pci_unfixup_slot(struct pci_dev *dev)
-{
-	struct pci_dev *host_pci_dev = SN_PCIDEV_INFO(dev)->host_pci_dev;
-
-	sn_irq_unfixup(dev);
-	pci_dev_put(host_pci_dev);
-	pci_dev_put(dev);
-}
-
 /*
- * sn_pci_fixup_slot() - This routine sets up a slot's resources
- * consistent with the Linux PCI abstraction layer.  Resources acquired
- * from our PCI provider include PIO maps to BAR space and interrupt
- * objects.
+ * sn_more_slot_fixup() - We are not running with an ACPI capable PROM,
+ *			  and need to convert the pci_dev->resource
+ *			  'start' and 'end' addresses to mapped addresses,
+ *			  and setup the pci_controller->window array entries.
  */
-void sn_pci_fixup_slot(struct pci_dev *dev)
+void
+sn_more_slot_fixup(struct pci_dev *dev, struct pcidev_info *pcidev_info)
 {
 	unsigned int count = 0;
 	int idx;
-	int segment = pci_domain_nr(dev->bus);
-	int status = 0;
-	struct pcibus_bussoft *bs;
- 	struct pci_bus *host_pci_bus;
- 	struct pci_dev *host_pci_dev;
-	struct pcidev_info *pcidev_info;
 	s64 pci_addrs[PCI_ROM_RESOURCE + 1];
- 	struct sn_irq_info *sn_irq_info;
- 	unsigned long size;
- 	unsigned int bus_no, devfn;
-
-	pci_dev_get(dev); /* for the sysdata pointer */
-	pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
-	if (!pcidev_info)
-		BUG();		/* Cannot afford to run out of memory */
-
-	sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
-	if (!sn_irq_info)
-		BUG();		/* Cannot afford to run out of memory */
-
-	/* Call to retrieve pci device information needed by kernel. */
-	status = sal_get_pcidev_info((u64) segment, (u64) dev->bus->number, 
-				     dev->devfn,
-				     (u64) __pa(pcidev_info),
-				     (u64) __pa(sn_irq_info));
-	if (status)
-		BUG(); /* Cannot get platform pci device information */
-
-	/* Add pcidev_info to list in sn_pci_controller struct */
-	list_add_tail(&pcidev_info->pdi_list,
-		      &(SN_PCI_CONTROLLER(dev->bus)->pcidev_info));
+	unsigned long addr, end, size, start;
 
 	/* Copy over PIO Mapped Addresses */
 	for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
-		unsigned long start, end, addr;
 
 		if (!pcidev_info->pdi_pio_mapped_addr[idx]) {
 			pci_addrs[idx] = -1;
@@ -425,54 +216,19 @@ void sn_pci_fixup_slot(struct pci_dev *dev)
 	 */
 	if (count > 0)
 		sn_pci_window_fixup(dev, count, pci_addrs);
-
-	/*
-	 * Using the PROMs values for the PCI host bus, get the Linux
- 	 * PCI host_pci_dev struct and set up host bus linkages
- 	 */
-
-	bus_no = (pcidev_info->pdi_slot_host_handle >> 32) & 0xff;
-	devfn = pcidev_info->pdi_slot_host_handle & 0xffffffff;
- 	host_pci_bus = pci_find_bus(segment, bus_no);
- 	host_pci_dev = pci_get_slot(host_pci_bus, devfn);
-
-	pcidev_info->host_pci_dev = host_pci_dev;
-	pcidev_info->pdi_linux_pcidev = dev;
-	pcidev_info->pdi_host_pcidev_info = SN_PCIDEV_INFO(host_pci_dev);
-	bs = SN_PCIBUS_BUSSOFT(dev->bus);
-	pcidev_info->pdi_pcibus_info = bs;
-
-	if (bs && bs->bs_asic_type < PCIIO_ASIC_MAX_TYPES) {
-		SN_PCIDEV_BUSPROVIDER(dev) = sn_pci_provider[bs->bs_asic_type];
-	} else {
-		SN_PCIDEV_BUSPROVIDER(dev) = &sn_pci_default_provider;
-	}
-
-	/* Only set up IRQ stuff if this device has a host bus context */
-	if (bs && sn_irq_info->irq_irq) {
-		pcidev_info->pdi_sn_irq_info = sn_irq_info;
-		dev->irq = pcidev_info->pdi_sn_irq_info->irq_irq;
-		sn_irq_fixup(dev, sn_irq_info);
-	} else {
-		pcidev_info->pdi_sn_irq_info = NULL;
-		kfree(sn_irq_info);
-	}
 }
 
 /*
  * sn_pci_controller_fixup() - This routine sets up a bus's resources
- * consistent with the Linux PCI abstraction layer.
+ *			       consistent with the Linux PCI abstraction layer.
  */
-void sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
+static void
+sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
 {
-	int status;
-	int nasid, cnode;
+	s64 status = 0;
 	struct pci_controller *controller;
-	struct sn_pci_controller *sn_controller;
 	struct pcibus_bussoft *prom_bussoft_ptr;
-	struct hubdev_info *hubdev_info;
-	void *provider_soft;
-	struct sn_pcibus_provider *provider;
+
 
  	status = sal_get_pcibus_info((u64) segment, (u64) busnum,
  				     (u64) ia64_tpa(&prom_bussoft_ptr));
@@ -480,261 +236,77 @@ void sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
 		return;		/*bus # does not exist */
 	prom_bussoft_ptr = __va(prom_bussoft_ptr);
 
-	/* Allocate a sn_pci_controller, which has a pci_controller struct
-	 * as the first member.
-	 */
-	sn_controller = kzalloc(sizeof(struct sn_pci_controller), GFP_KERNEL);
-	if (!sn_controller)
+	controller = kzalloc(sizeof(*controller), GFP_KERNEL);
+	if (!controller)
 		BUG();
-	INIT_LIST_HEAD(&sn_controller->pcidev_info);
-	controller = &sn_controller->pci_controller;
 	controller->segment = segment;
 
-	if (bus == NULL) {
- 		bus = pci_scan_bus(busnum, &pci_root_ops, controller);
- 		if (bus == NULL)
- 			goto error_return; /* error, or bus already scanned */
- 		bus->sysdata = NULL;
-	}
-
-	if (bus->sysdata)
-		goto error_return; /* sysdata already alloc'd */
-
 	/*
-	 * Per-provider fixup.  Copies the contents from prom to local
-	 * area and links SN_PCIBUS_BUSSOFT().
+	 * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
+	 * (platform_data will be overwritten later in sn_common_bus_fixup())
 	 */
+	controller->platform_data = prom_bussoft_ptr;
 
-	if (prom_bussoft_ptr->bs_asic_type >= PCIIO_ASIC_MAX_TYPES)
-		goto error_return; /* unsupported asic type */
-
-	if (prom_bussoft_ptr->bs_asic_type == PCIIO_ASIC_TYPE_PPB)
-		goto error_return; /* no further fixup necessary */
-
-	provider = sn_pci_provider[prom_bussoft_ptr->bs_asic_type];
-	if (provider == NULL)
-		goto error_return; /* no provider registerd for this asic */
+	bus = pci_scan_bus(busnum, &pci_root_ops, controller);
+ 	if (bus == NULL)
+ 		goto error_return; /* error, or bus already scanned */
 
 	bus->sysdata = controller;
-	if (provider->bus_fixup)
-		provider_soft = (*provider->bus_fixup) (prom_bussoft_ptr, controller);
-	else
-		provider_soft = NULL;
-
-	if (provider_soft == NULL) {
-		/* fixup failed or not applicable */
-		bus->sysdata = NULL;
-		goto error_return;
-	}
-
-	/*
-	 * Setup pci_windows for legacy IO and MEM space.
-	 * (Temporary until ACPI support is in place.)
-	 */
-	controller->window = kcalloc(2, sizeof(struct pci_window), GFP_KERNEL);
-	if (controller->window == NULL)
-		BUG();
-	controller->window[0].offset = prom_bussoft_ptr->bs_legacy_io;
-	controller->window[0].resource.name = "legacy_io";
-	controller->window[0].resource.flags = IORESOURCE_IO;
-	controller->window[0].resource.start = prom_bussoft_ptr->bs_legacy_io;
-	controller->window[0].resource.end =
-	    controller->window[0].resource.start + 0xffff;
-	controller->window[0].resource.parent = &ioport_resource;
-	controller->window[1].offset = prom_bussoft_ptr->bs_legacy_mem;
-	controller->window[1].resource.name = "legacy_mem";
-	controller->window[1].resource.flags = IORESOURCE_MEM;
-	controller->window[1].resource.start = prom_bussoft_ptr->bs_legacy_mem;
-	controller->window[1].resource.end =
-	    controller->window[1].resource.start + (1024 * 1024) - 1;
-	controller->window[1].resource.parent = &iomem_resource;
-	controller->windows = 2;
-
-	/*
-	 * Generic bus fixup goes here.  Don't reference prom_bussoft_ptr
-	 * after this point.
-	 */
-
-	PCI_CONTROLLER(bus)->platform_data = provider_soft;
-	nasid = NASID_GET(SN_PCIBUS_BUSSOFT(bus)->bs_base);
-	cnode = nasid_to_cnodeid(nasid);
-	hubdev_info = (struct hubdev_info *)(NODEPDA(cnode)->pdinfo);
-	SN_PCIBUS_BUSSOFT(bus)->bs_xwidget_info =
-	    &(hubdev_info->hdi_xwidget_info[SN_PCIBUS_BUSSOFT(bus)->bs_xid]);
 
-	/*
-	 * If the node information we obtained during the fixup phase is invalid
-	 * then set controller->node to -1 (undetermined)
-	 */
-	if (controller->node >= num_online_nodes()) {
-		struct pcibus_bussoft *b = SN_PCIBUS_BUSSOFT(bus);
-
-		printk(KERN_WARNING "Device ASIC=%u XID=%u PBUSNUM=%u"
-				    "L_IO=%lx L_MEM=%lx BASE=%lx\n",
-			b->bs_asic_type, b->bs_xid, b->bs_persist_busnum,
-			b->bs_legacy_io, b->bs_legacy_mem, b->bs_base);
-		printk(KERN_WARNING "on node %d but only %d nodes online."
-			"Association set to undetermined.\n",
-			controller->node, num_online_nodes());
-		controller->node = -1;
-	}
 	return;
 
 error_return:
 
-	kfree(sn_controller);
+	kfree(controller);
 	return;
 }
 
-void sn_bus_store_sysdata(struct pci_dev *dev)
+/*
+ * sn_bus_fixup
+ */
+void
+sn_bus_fixup(struct pci_bus *bus)
 {
-	struct sysdata_el *element;
-
-	element = kzalloc(sizeof(struct sysdata_el), GFP_KERNEL);
-	if (!element) {
-		dev_dbg(dev, "%s: out of memory!\n", __FUNCTION__);
-		return;
-	}
-	element->sysdata = SN_PCIDEV_INFO(dev);
-	list_add(&element->entry, &sn_sysdata_list);
-}
+	struct pci_dev *pci_dev = NULL;
+	struct pcibus_bussoft *prom_bussoft_ptr;
+	extern void sn_common_bus_fixup(struct pci_bus *,
+					struct pcibus_bussoft *);
+
+
+	if (!bus->parent) {  /* If root bus */
+		prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
+		if (prom_bussoft_ptr == NULL) {
+			printk(KERN_ERR
+			       "sn_bus_fixup: 0x%04x:0x%02x Unable to "
+			       "obtain prom_bussoft_ptr\n",
+			       pci_domain_nr(bus), bus->number);
+			return;
+		}
+		sn_common_bus_fixup(bus, prom_bussoft_ptr);
+		sn_legacy_pci_window_fixup(PCI_CONTROLLER(bus),
+					   prom_bussoft_ptr->bs_legacy_io,
+					   prom_bussoft_ptr->bs_legacy_mem);
+        }
+        list_for_each_entry(pci_dev, &bus->devices, bus_list) {
+                sn_pci_fixup_slot(pci_dev);
+        }
 
-void sn_bus_free_sysdata(void)
-{
-	struct sysdata_el *element;
-	struct list_head *list, *safe;
-
-	list_for_each_safe(list, safe, &sn_sysdata_list) {
-		element = list_entry(list, struct sysdata_el, entry);
-		list_del(&element->entry);
-		list_del(&(((struct pcidev_info *)
-			     (element->sysdata))->pdi_list));
-		kfree(element->sysdata);
-		kfree(element);
-	}
-	return;
 }
 
 /*
- * Ugly hack to get PCI setup until we have a proper ACPI namespace.
+ * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
+ *		so we need to do things the hard way, including initiating the
+ *		bus scanning ourselves.
  */
 
-#define PCI_BUSES_TO_SCAN 256
-
-static int __init sn_pci_init(void)
+void __init sn_io_init(void)
 {
 	int i, j;
-	struct pci_dev *pci_dev = NULL;
-
-	if (!ia64_platform_is("sn2") || IS_RUNNING_ON_FAKE_PROM())
-		return 0;
-
-	/*
-	 * prime sn_pci_provider[].  Individial provider init routines will
-	 * override their respective default entries.
-	 */
-
-	for (i = 0; i < PCIIO_ASIC_MAX_TYPES; i++)
-		sn_pci_provider[i] = &sn_pci_default_provider;
 
-	pcibr_init_provider();
-	tioca_init_provider();
-	tioce_init_provider();
-
-	/*
-	 * This is needed to avoid bounce limit checks in the blk layer
-	 */
-	ia64_max_iommu_merge_mask = ~PAGE_MASK;
 	sn_fixup_ionodes();
-	sn_irq_lh_init();
-	INIT_LIST_HEAD(&sn_sysdata_list);
-	sn_init_cpei_timer();
-
-#ifdef CONFIG_PROC_FS
-	register_sn_procfs();
-#endif
 
 	/* busses are not known yet ... */
 	for (i = 0; i <= max_segment_number; i++)
 		for (j = 0; j <= max_pcibus_number; j++)
 			sn_pci_controller_fixup(i, j, NULL);
-
-	/*
-	 * Generic Linux PCI Layer has created the pci_bus and pci_dev 
-	 * structures - time for us to add our SN PLatform specific 
-	 * information.
-	 */
-
-	while ((pci_dev =
-		pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pci_dev)) != NULL)
-		sn_pci_fixup_slot(pci_dev);
-
-	sn_ioif_inited = 1;	/* sn I/O infrastructure now initialized */
-
-	return 0;
-}
-
-/*
- * hubdev_init_node() - Creates the HUB data structure and link them to it's 
- *	own NODE specific data area.
- */
-void hubdev_init_node(nodepda_t * npda, cnodeid_t node)
-{
-	struct hubdev_info *hubdev_info;
-	int size;
-	pg_data_t *pg;
-
-	size = sizeof(struct hubdev_info);
-
-	if (node >= num_online_nodes())	/* Headless/memless IO nodes */
-		pg = NODE_DATA(0);
-	else
-		pg = NODE_DATA(node);
-
-	hubdev_info = (struct hubdev_info *)alloc_bootmem_node(pg, size);
-
-	npda->pdinfo = (void *)hubdev_info;
 }
-
-geoid_t
-cnodeid_get_geoid(cnodeid_t cnode)
-{
-	struct hubdev_info *hubdev;
-
-	hubdev = (struct hubdev_info *)(NODEPDA(cnode)->pdinfo);
-	return hubdev->hdi_geoid;
-}
-
-void sn_generate_path(struct pci_bus *pci_bus, char *address)
-{
-	nasid_t nasid;
-	cnodeid_t cnode;
-	geoid_t geoid;
-	moduleid_t moduleid;
-	u16 bricktype;
-
-	nasid = NASID_GET(SN_PCIBUS_BUSSOFT(pci_bus)->bs_base);
-	cnode = nasid_to_cnodeid(nasid);
-	geoid = cnodeid_get_geoid(cnode);
-	moduleid = geo_module(geoid);
-
-	sprintf(address, "module_%c%c%c%c%.2d",
-		'0'+RACK_GET_CLASS(MODULE_GET_RACK(moduleid)),
-		'0'+RACK_GET_GROUP(MODULE_GET_RACK(moduleid)),
-		'0'+RACK_GET_NUM(MODULE_GET_RACK(moduleid)),
-		MODULE_GET_BTCHAR(moduleid), MODULE_GET_BPOS(moduleid));
-
-	/* Tollhouse requires slot id to be displayed */
-	bricktype = MODULE_GET_BTYPE(moduleid);
-	if ((bricktype == L1_BRICKTYPE_191010) ||
-	    (bricktype == L1_BRICKTYPE_1932))
-			sprintf(address, "%s^%d", address, geo_slot(geoid));
-}
-
-subsys_initcall(sn_pci_init);
-EXPORT_SYMBOL(sn_pci_fixup_slot);
-EXPORT_SYMBOL(sn_pci_unfixup_slot);
-EXPORT_SYMBOL(sn_pci_controller_fixup);
-EXPORT_SYMBOL(sn_bus_store_sysdata);
-EXPORT_SYMBOL(sn_bus_free_sysdata);
-EXPORT_SYMBOL(sn_generate_path);