arch/ia64/sn/kernel/io_init.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * 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.
 */

#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/pcibr_provider.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
 */

static dma_addr_t
sn_default_pci_map(struct pci_dev *pdev, unsigned long paddr, size_t size)
{
	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;

	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.
 */
static inline u64 sal_get_hubdev_info(u64 handle, u64 address)
{
	struct ia64_sal_retval ret_stuff;
	ret_stuff.status = 0;
	ret_stuff.v0 = 0;

	SAL_CALL_NOLOCK(ret_stuff,
			(u64) SN_SAL_IOIF_GET_HUBDEV_INFO,
			(u64) handle, (u64) address, 0, 0, 0, 0, 0);
	return ret_stuff.v0;
}

/*
 * Retrieve the pci bus information given the bus number.
 */
static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
{
	struct ia64_sal_retval ret_stuff;
	ret_stuff.status = 0;
	ret_stuff.v0 = 0;

	SAL_CALL_NOLOCK(ret_stuff,
			(u64) SN_SAL_IOIF_GET_PCIBUS_INFO,
			(u64) segment, (u64) busnum, (u64) address, 0, 0, 0, 0);
	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.
 */
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;

	/*
	 * Get SGI Specific HUB chipset information.
	 * Inform Prom that this kernel can support domain bus numbering.
	 */
	for (i = 0; i < num_cnodes; i++) {
		hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
		nasid = cnodeid_to_nasid(i);
		hubdev->max_segment_number = 0xffffffff;
		hubdev->max_pcibus_number = 0xff;
		status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
		if (status)
			continue;

		/* Save the largest Domain and pcibus numbers found. */
		if (hubdev->max_segment_number) {
			/*
			 * Dealing with a Prom that supports segments.
			 */
			max_segment_number = hubdev->max_segment_number;
			max_pcibus_number = hubdev->max_pcibus_number;
		}

		/* 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)
			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;
	        }
	}
}

/*
 * 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.
 */
static void
sn_pci_window_fixup(struct pci_dev *dev, unsigned int count,
		    s64 * pci_addrs)
{
	struct pci_controller *controller = PCI_CONTROLLER(dev->bus);
	unsigned int i;
	unsigned int idx;
	unsigned int new_count;
	struct pci_window *new_window;

	if (count == 0)
		return;
	idx = controller->windows;
	new_count = controller->windows + count;
	new_window = kcalloc(new_count, sizeof(struct pci_window), GFP_KERNEL);
	if (new_window == NULL)
		BUG();
	if (controller->window) {
		memcpy(new_window, controller->window,
		       sizeof(struct pci_window) * controller->windows);
		kfree(controller->window);
	}

	/* Setup a pci_window for each device resource. */
	for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
		if (pci_addrs[i] == -1)
			continue;

		new_window[idx].offset = dev->resource[i].start - pci_addrs[i];
		new_window[idx].resource = dev->resource[i];
		idx++;
	}

	controller->windows = new_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.
 */
void sn_pci_fixup_slot(struct pci_dev *dev)
{
	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));

	/* 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;
			continue;
		}

		start = dev->resource[idx].start;
		end = dev->resource[idx].end;
		size = end - start;
		if (size == 0) {
			pci_addrs[idx] = -1;
			continue;
		}
		pci_addrs[idx] = start;
		count++;
		addr = pcidev_info->pdi_pio_mapped_addr[idx];
		addr = ((addr << 4) >> 4) | __IA64_UNCACHED_OFFSET;
		dev->resource[idx].start = addr;
		dev->resource[idx].end = addr + size;
		if (dev->resource[idx].flags & IORESOURCE_IO)
			dev->resource[idx].parent = &ioport_resource;
		else
			dev->resource[idx].parent = &iomem_resource;
	}
	/* Create a pci_window in the pci_controller struct for
	 * each device resource.
	 */
	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);
	}

	/*
	 * MSI currently not supported on altix.  Remove this when
	 * the MSI abstraction patches are integrated into the kernel
	 * (sometime after 2.6.16 releases)
	 */
	dev->no_msi = 1;
}

/*
 * sn_pci_controller_fixup() - This routine sets up a bus's resources
 * consistent with the Linux PCI abstraction layer.
 */
void sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
{
	int status;
	int nasid, cnode;
	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));
 	if (status > 0)
		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)
		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().
	 */

	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->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);
	return;
}

void sn_bus_store_sysdata(struct pci_dev *dev)
{
	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);
}

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.
 */

#define PCI_BUSES_TO_SCAN 256

static int __init sn_pci_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;
}

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);