powerpc/32: Restore previous version of 32-bit PCI code

When I removed the powermac support from arch/ppc/kernel/pci.c,
I overlooked the fact that that file is used in 32-bit ARCH=powerpc
builds. To prevent problems in future, restore the original version
of that file as arch/powerpc/kernel/pci_32.c, and use that.

Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/kernel/Makefile

···
 
 pci64-$(CONFIG_PPC64)		+= pci_64.o pci_dn.o pci_iommu.o \
 				   pci_direct_iommu.o iomap.o
-obj-$(CONFIG_PCI)		+= $(pci64-y)
+pci32-$(CONFIG_PPC32)		:= pci_32.o
+obj-$(CONFIG_PCI)		+= $(pci64-y) $(pci32-y)
 kexec-$(CONFIG_PPC64)		:= machine_kexec_64.o crash.o
 kexec-$(CONFIG_PPC32)		:= machine_kexec_32.o
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o $(kexec-y)

arch/powerpc/kernel/pci_32.c

···
+/*
+ * Common pmac/prep/chrp pci routines. -- Cort
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/capability.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/bootmem.h>
+
+#include <asm/processor.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/sections.h>
+#include <asm/pci-bridge.h>
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/machdep.h>
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+unsigned long isa_io_base     = 0;
+unsigned long isa_mem_base    = 0;
+unsigned long pci_dram_offset = 0;
+int pcibios_assign_bus_offset = 1;
+
+void pcibios_make_OF_bus_map(void);
+
+static int pci_relocate_bridge_resource(struct pci_bus *bus, int i);
+static int probe_resource(struct pci_bus *parent, struct resource *pr,
+			  struct resource *res, struct resource **conflict);
+static void update_bridge_base(struct pci_bus *bus, int i);
+static void pcibios_fixup_resources(struct pci_dev* dev);
+static void fixup_broken_pcnet32(struct pci_dev* dev);
+static int reparent_resources(struct resource *parent, struct resource *res);
+static void fixup_cpc710_pci64(struct pci_dev* dev);
+#ifdef CONFIG_PPC_OF
+static u8* pci_to_OF_bus_map;
+#endif
+
+/* By default, we don't re-assign bus numbers. We do this only on
+ * some pmacs
+ */
+int pci_assign_all_buses;
+
+struct pci_controller* hose_head;
+struct pci_controller** hose_tail = &hose_head;
+
+static int pci_bus_count;
+
+static void
+fixup_broken_pcnet32(struct pci_dev* dev)
+{
+	if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
+		dev->vendor = PCI_VENDOR_ID_AMD;
+		pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT,	PCI_ANY_ID,			fixup_broken_pcnet32);
+
+static void
+fixup_cpc710_pci64(struct pci_dev* dev)
+{
+	/* Hide the PCI64 BARs from the kernel as their content doesn't
+	 * fit well in the resource management
+	 */
+	dev->resource[0].start = dev->resource[0].end = 0;
+	dev->resource[0].flags = 0;
+	dev->resource[1].start = dev->resource[1].end = 0;
+	dev->resource[1].flags = 0;
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixup_cpc710_pci64);
+
+static void
+pcibios_fixup_resources(struct pci_dev *dev)
+{
+	struct pci_controller* hose = (struct pci_controller *)dev->sysdata;
+	int i;
+	unsigned long offset;
+
+	if (!hose) {
+		printk(KERN_ERR "No hose for PCI dev %s!\n", pci_name(dev));
+		return;
+	}
+	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+		struct resource *res = dev->resource + i;
+		if (!res->flags)
+			continue;
+		if (res->end == 0xffffffff) {
+			DBG("PCI:%s Resource %d [%08lx-%08lx] is unassigned\n",
+			    pci_name(dev), i, res->start, res->end);
+			res->end -= res->start;
+			res->start = 0;
+			res->flags |= IORESOURCE_UNSET;
+			continue;
+		}
+		offset = 0;
+		if (res->flags & IORESOURCE_MEM) {
+			offset = hose->pci_mem_offset;
+		} else if (res->flags & IORESOURCE_IO) {
+			offset = (unsigned long) hose->io_base_virt
+				- isa_io_base;
+		}
+		if (offset != 0) {
+			res->start += offset;
+			res->end += offset;
+#ifdef DEBUG
+			printk("Fixup res %d (%lx) of dev %s: %lx -> %lx\n",
+			       i, res->flags, pci_name(dev),
+			       res->start - offset, res->start);
+#endif
+		}
+	}
+
+	/* Call machine specific resource fixup */
+	if (ppc_md.pcibios_fixup_resources)
+		ppc_md.pcibios_fixup_resources(dev);
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID,		PCI_ANY_ID,			pcibios_fixup_resources);
+
+void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
+			struct resource *res)
+{
+	unsigned long offset = 0;
+	struct pci_controller *hose = dev->sysdata;
+
+	if (hose && res->flags & IORESOURCE_IO)
+		offset = (unsigned long)hose->io_base_virt - isa_io_base;
+	else if (hose && res->flags & IORESOURCE_MEM)
+		offset = hose->pci_mem_offset;
+	region->start = res->start - offset;
+	region->end = res->end - offset;
+}
+EXPORT_SYMBOL(pcibios_resource_to_bus);
+
+void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
+			     struct pci_bus_region *region)
+{
+	unsigned long offset = 0;
+	struct pci_controller *hose = dev->sysdata;
+
+	if (hose && res->flags & IORESOURCE_IO)
+		offset = (unsigned long)hose->io_base_virt - isa_io_base;
+	else if (hose && res->flags & IORESOURCE_MEM)
+		offset = hose->pci_mem_offset;
+	res->start = region->start + offset;
+	res->end = region->end + offset;
+}
+EXPORT_SYMBOL(pcibios_bus_to_resource);
+
+/*
+ * We need to avoid collisions with `mirrored' VGA ports
+ * and other strange ISA hardware, so we always want the
+ * addresses to be allocated in the 0x000-0x0ff region
+ * modulo 0x400.
+ *
+ * Why? Because some silly external IO cards only decode
+ * the low 10 bits of the IO address. The 0x00-0xff region
+ * is reserved for motherboard devices that decode all 16
+ * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
+ * but we want to try to avoid allocating at 0x2900-0x2bff
+ * which might have be mirrored at 0x0100-0x03ff..
+ */
+void pcibios_align_resource(void *data, struct resource *res, unsigned long size,
+		       unsigned long align)
+{
+	struct pci_dev *dev = data;
+
+	if (res->flags & IORESOURCE_IO) {
+		unsigned long start = res->start;
+
+		if (size > 0x100) {
+			printk(KERN_ERR "PCI: I/O Region %s/%d too large"
+			       " (%ld bytes)\n", pci_name(dev),
+			       dev->resource - res, size);
+		}
+
+		if (start & 0x300) {
+			start = (start + 0x3ff) & ~0x3ff;
+			res->start = start;
+		}
+	}
+}
+EXPORT_SYMBOL(pcibios_align_resource);
+
+/*
+ *  Handle resources of PCI devices.  If the world were perfect, we could
+ *  just allocate all the resource regions and do nothing more.  It isn't.
+ *  On the other hand, we cannot just re-allocate all devices, as it would
+ *  require us to know lots of host bridge internals.  So we attempt to
+ *  keep as much of the original configuration as possible, but tweak it
+ *  when it's found to be wrong.
+ *
+ *  Known BIOS problems we have to work around:
+ *	- I/O or memory regions not configured
+ *	- regions configured, but not enabled in the command register
+ *	- bogus I/O addresses above 64K used
+ *	- expansion ROMs left enabled (this may sound harmless, but given
+ *	  the fact the PCI specs explicitly allow address decoders to be
+ *	  shared between expansion ROMs and other resource regions, it's
+ *	  at least dangerous)
+ *
+ *  Our solution:
+ *	(1) Allocate resources for all buses behind PCI-to-PCI bridges.
+ *	    This gives us fixed barriers on where we can allocate.
+ *	(2) Allocate resources for all enabled devices.  If there is
+ *	    a collision, just mark the resource as unallocated. Also
+ *	    disable expansion ROMs during this step.
+ *	(3) Try to allocate resources for disabled devices.  If the
+ *	    resources were assigned correctly, everything goes well,
+ *	    if they weren't, they won't disturb allocation of other
+ *	    resources.
+ *	(4) Assign new addresses to resources which were either
+ *	    not configured at all or misconfigured.  If explicitly
+ *	    requested by the user, configure expansion ROM address
+ *	    as well.
+ */
+
+static void __init
+pcibios_allocate_bus_resources(struct list_head *bus_list)
+{
+	struct pci_bus *bus;
+	int i;
+	struct resource *res, *pr;
+
+	/* Depth-First Search on bus tree */
+	list_for_each_entry(bus, bus_list, node) {
+		for (i = 0; i < 4; ++i) {
+			if ((res = bus->resource[i]) == NULL || !res->flags
+			    || res->start > res->end)
+				continue;
+			if (bus->parent == NULL)
+				pr = (res->flags & IORESOURCE_IO)?
+					&ioport_resource: &iomem_resource;
+			else {
+				pr = pci_find_parent_resource(bus->self, res);
+				if (pr == res) {
+					/* this happens when the generic PCI
+					 * code (wrongly) decides that this
+					 * bridge is transparent  -- paulus
+					 */
+					continue;
+				}
+			}
+
+			DBG("PCI: bridge rsrc %lx..%lx (%lx), parent %p\n",
+			    res->start, res->end, res->flags, pr);
+			if (pr) {
+				if (request_resource(pr, res) == 0)
+					continue;
+				/*
+				 * Must be a conflict with an existing entry.
+				 * Move that entry (or entries) under the
+				 * bridge resource and try again.
+				 */
+				if (reparent_resources(pr, res) == 0)
+					continue;
+			}
+			printk(KERN_ERR "PCI: Cannot allocate resource region "
+			       "%d of PCI bridge %d\n", i, bus->number);
+			if (pci_relocate_bridge_resource(bus, i))
+				bus->resource[i] = NULL;
+		}
+		pcibios_allocate_bus_resources(&bus->children);
+	}
+}
+
+/*
+ * Reparent resource children of pr that conflict with res
+ * under res, and make res replace those children.
+ */
+static int __init
+reparent_resources(struct resource *parent, struct resource *res)
+{
+	struct resource *p, **pp;
+	struct resource **firstpp = NULL;
+
+	for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
+		if (p->end < res->start)
+			continue;
+		if (res->end < p->start)
+			break;
+		if (p->start < res->start || p->end > res->end)
+			return -1;	/* not completely contained */
+		if (firstpp == NULL)
+			firstpp = pp;
+	}
+	if (firstpp == NULL)
+		return -1;	/* didn't find any conflicting entries? */
+	res->parent = parent;
+	res->child = *firstpp;
+	res->sibling = *pp;
+	*firstpp = res;
+	*pp = NULL;
+	for (p = res->child; p != NULL; p = p->sibling) {
+		p->parent = res;
+		DBG(KERN_INFO "PCI: reparented %s [%lx..%lx] under %s\n",
+		    p->name, p->start, p->end, res->name);
+	}
+	return 0;
+}
+
+/*
+ * A bridge has been allocated a range which is outside the range
+ * of its parent bridge, so it needs to be moved.
+ */
+static int __init
+pci_relocate_bridge_resource(struct pci_bus *bus, int i)
+{
+	struct resource *res, *pr, *conflict;
+	unsigned long try, size;
+	int j;
+	struct pci_bus *parent = bus->parent;
+
+	if (parent == NULL) {
+		/* shouldn't ever happen */
+		printk(KERN_ERR "PCI: can't move host bridge resource\n");
+		return -1;
+	}
+	res = bus->resource[i];
+	if (res == NULL)
+		return -1;
+	pr = NULL;
+	for (j = 0; j < 4; j++) {
+		struct resource *r = parent->resource[j];
+		if (!r)
+			continue;
+		if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM))
+			continue;
+		if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH)) {
+			pr = r;
+			break;
+		}
+		if (res->flags & IORESOURCE_PREFETCH)
+			pr = r;
+	}
+	if (pr == NULL)
+		return -1;
+	size = res->end - res->start;
+	if (pr->start > pr->end || size > pr->end - pr->start)
+		return -1;
+	try = pr->end;
+	for (;;) {
+		res->start = try - size;
+		res->end = try;
+		if (probe_resource(bus->parent, pr, res, &conflict) == 0)
+			break;
+		if (conflict->start <= pr->start + size)
+			return -1;
+		try = conflict->start - 1;
+	}
+	if (request_resource(pr, res)) {
+		DBG(KERN_ERR "PCI: huh? couldn't move to %lx..%lx\n",
+		    res->start, res->end);
+		return -1;		/* "can't happen" */
+	}
+	update_bridge_base(bus, i);
+	printk(KERN_INFO "PCI: bridge %d resource %d moved to %lx..%lx\n",
+	       bus->number, i, res->start, res->end);
+	return 0;
+}
+
+static int __init
+probe_resource(struct pci_bus *parent, struct resource *pr,
+	       struct resource *res, struct resource **conflict)
+{
+	struct pci_bus *bus;
+	struct pci_dev *dev;
+	struct resource *r;
+	int i;
+
+	for (r = pr->child; r != NULL; r = r->sibling) {
+		if (r->end >= res->start && res->end >= r->start) {
+			*conflict = r;
+			return 1;
+		}
+	}
+	list_for_each_entry(bus, &parent->children, node) {
+		for (i = 0; i < 4; ++i) {
+			if ((r = bus->resource[i]) == NULL)
+				continue;
+			if (!r->flags || r->start > r->end || r == res)
+				continue;
+			if (pci_find_parent_resource(bus->self, r) != pr)
+				continue;
+			if (r->end >= res->start && res->end >= r->start) {
+				*conflict = r;
+				return 1;
+			}
+		}
+	}
+	list_for_each_entry(dev, &parent->devices, bus_list) {
+		for (i = 0; i < 6; ++i) {
+			r = &dev->resource[i];
+			if (!r->flags || (r->flags & IORESOURCE_UNSET))
+				continue;
+			if (pci_find_parent_resource(dev, r) != pr)
+				continue;
+			if (r->end >= res->start && res->end >= r->start) {
+				*conflict = r;
+				return 1;
+			}
+		}
+	}
+	return 0;
+}
+
+static void __init
+update_bridge_base(struct pci_bus *bus, int i)
+{
+	struct resource *res = bus->resource[i];
+	u8 io_base_lo, io_limit_lo;
+	u16 mem_base, mem_limit;
+	u16 cmd;
+	unsigned long start, end, off;
+	struct pci_dev *dev = bus->self;
+	struct pci_controller *hose = dev->sysdata;
+
+	if (!hose) {
+		printk("update_bridge_base: no hose?\n");
+		return;
+	}
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+	pci_write_config_word(dev, PCI_COMMAND,
+			      cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY));
+	if (res->flags & IORESOURCE_IO) {
+		off = (unsigned long) hose->io_base_virt - isa_io_base;
+		start = res->start - off;
+		end = res->end - off;
+		io_base_lo = (start >> 8) & PCI_IO_RANGE_MASK;
+		io_limit_lo = (end >> 8) & PCI_IO_RANGE_MASK;
+		if (end > 0xffff) {
+			pci_write_config_word(dev, PCI_IO_BASE_UPPER16,
+					      start >> 16);
+			pci_write_config_word(dev, PCI_IO_LIMIT_UPPER16,
+					      end >> 16);
+			io_base_lo |= PCI_IO_RANGE_TYPE_32;
+		} else
+			io_base_lo |= PCI_IO_RANGE_TYPE_16;
+		pci_write_config_byte(dev, PCI_IO_BASE, io_base_lo);
+		pci_write_config_byte(dev, PCI_IO_LIMIT, io_limit_lo);
+
+	} else if ((res->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH))
+		   == IORESOURCE_MEM) {
+		off = hose->pci_mem_offset;
+		mem_base = ((res->start - off) >> 16) & PCI_MEMORY_RANGE_MASK;
+		mem_limit = ((res->end - off) >> 16) & PCI_MEMORY_RANGE_MASK;
+		pci_write_config_word(dev, PCI_MEMORY_BASE, mem_base);
+		pci_write_config_word(dev, PCI_MEMORY_LIMIT, mem_limit);
+
+	} else if ((res->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH))
+		   == (IORESOURCE_MEM | IORESOURCE_PREFETCH)) {
+		off = hose->pci_mem_offset;
+		mem_base = ((res->start - off) >> 16) & PCI_PREF_RANGE_MASK;
+		mem_limit = ((res->end - off) >> 16) & PCI_PREF_RANGE_MASK;
+		pci_write_config_word(dev, PCI_PREF_MEMORY_BASE, mem_base);
+		pci_write_config_word(dev, PCI_PREF_MEMORY_LIMIT, mem_limit);
+
+	} else {
+		DBG(KERN_ERR "PCI: ugh, bridge %s res %d has flags=%lx\n",
+		    pci_name(dev), i, res->flags);
+	}
+	pci_write_config_word(dev, PCI_COMMAND, cmd);
+}
+
+static inline void alloc_resource(struct pci_dev *dev, int idx)
+{
+	struct resource *pr, *r = &dev->resource[idx];
+
+	DBG("PCI:%s: Resource %d: %08lx-%08lx (f=%lx)\n",
+	    pci_name(dev), idx, r->start, r->end, r->flags);
+	pr = pci_find_parent_resource(dev, r);
+	if (!pr || request_resource(pr, r) < 0) {
+		printk(KERN_ERR "PCI: Cannot allocate resource region %d"
+		       " of device %s\n", idx, pci_name(dev));
+		if (pr)
+			DBG("PCI:  parent is %p: %08lx-%08lx (f=%lx)\n",
+			    pr, pr->start, pr->end, pr->flags);
+		/* We'll assign a new address later */
+		r->flags |= IORESOURCE_UNSET;
+		r->end -= r->start;
+		r->start = 0;
+	}
+}
+
+static void __init
+pcibios_allocate_resources(int pass)
+{
+	struct pci_dev *dev = NULL;
+	int idx, disabled;
+	u16 command;
+	struct resource *r;
+
+	for_each_pci_dev(dev) {
+		pci_read_config_word(dev, PCI_COMMAND, &command);
+		for (idx = 0; idx < 6; idx++) {
+			r = &dev->resource[idx];
+			if (r->parent)		/* Already allocated */
+				continue;
+			if (!r->flags || (r->flags & IORESOURCE_UNSET))
+				continue;	/* Not assigned at all */
+			if (r->flags & IORESOURCE_IO)
+				disabled = !(command & PCI_COMMAND_IO);
+			else
+				disabled = !(command & PCI_COMMAND_MEMORY);
+			if (pass == disabled)
+				alloc_resource(dev, idx);
+		}
+		if (pass)
+			continue;
+		r = &dev->resource[PCI_ROM_RESOURCE];
+		if (r->flags & IORESOURCE_ROM_ENABLE) {
+			/* Turn the ROM off, leave the resource region, but keep it unregistered. */
+			u32 reg;
+			DBG("PCI: Switching off ROM of %s\n", pci_name(dev));
+			r->flags &= ~IORESOURCE_ROM_ENABLE;
+			pci_read_config_dword(dev, dev->rom_base_reg, &reg);
+			pci_write_config_dword(dev, dev->rom_base_reg,
+					       reg & ~PCI_ROM_ADDRESS_ENABLE);
+		}
+	}
+}
+
+static void __init
+pcibios_assign_resources(void)
+{
+	struct pci_dev *dev = NULL;
+	int idx;
+	struct resource *r;
+
+	for_each_pci_dev(dev) {
+		int class = dev->class >> 8;
+
+		/* Don't touch classless devices and host bridges */
+		if (!class || class == PCI_CLASS_BRIDGE_HOST)
+			continue;
+
+		for (idx = 0; idx < 6; idx++) {
+			r = &dev->resource[idx];
+
+			/*
+			 * We shall assign a new address to this resource,
+			 * either because the BIOS (sic) forgot to do so
+			 * or because we have decided the old address was
+			 * unusable for some reason.
+			 */
+			if ((r->flags & IORESOURCE_UNSET) && r->end &&
+			    (!ppc_md.pcibios_enable_device_hook ||
+			     !ppc_md.pcibios_enable_device_hook(dev, 1))) {
+				r->flags &= ~IORESOURCE_UNSET;
+				pci_assign_resource(dev, idx);
+			}
+		}
+
+#if 0 /* don't assign ROMs */
+		r = &dev->resource[PCI_ROM_RESOURCE];
+		r->end -= r->start;
+		r->start = 0;
+		if (r->end)
+			pci_assign_resource(dev, PCI_ROM_RESOURCE);
+#endif
+	}
+}
+
+
+int
+pcibios_enable_resources(struct pci_dev *dev, int mask)
+{
+	u16 cmd, old_cmd;
+	int idx;
+	struct resource *r;
+
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+	old_cmd = cmd;
+	for (idx=0; idx<6; idx++) {
+		/* Only set up the requested stuff */
+		if (!(mask & (1<<idx)))
+			continue;
+	
+		r = &dev->resource[idx];
+		if (r->flags & IORESOURCE_UNSET) {
+			printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
+			return -EINVAL;
+		}
+		if (r->flags & IORESOURCE_IO)
+			cmd |= PCI_COMMAND_IO;
+		if (r->flags & IORESOURCE_MEM)
+			cmd |= PCI_COMMAND_MEMORY;
+	}
+	if (dev->resource[PCI_ROM_RESOURCE].start)
+		cmd |= PCI_COMMAND_MEMORY;
+	if (cmd != old_cmd) {
+		printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+	}
+	return 0;
+}
+
+static int next_controller_index;
+
+struct pci_controller * __init
+pcibios_alloc_controller(void)
+{
+	struct pci_controller *hose;
+
+	hose = (struct pci_controller *)alloc_bootmem(sizeof(*hose));
+	memset(hose, 0, sizeof(struct pci_controller));
+
+	*hose_tail = hose;
+	hose_tail = &hose->next;
+
+	hose->index = next_controller_index++;
+
+	return hose;
+}
+
+#ifdef CONFIG_PPC_OF
+/*
+ * Functions below are used on OpenFirmware machines.
+ */
+static void
+make_one_node_map(struct device_node* node, u8 pci_bus)
+{
+	int *bus_range;
+	int len;
+
+	if (pci_bus >= pci_bus_count)
+		return;
+	bus_range = (int *) get_property(node, "bus-range", &len);
+	if (bus_range == NULL || len < 2 * sizeof(int)) {
+		printk(KERN_WARNING "Can't get bus-range for %s, "
+		       "assuming it starts at 0\n", node->full_name);
+		pci_to_OF_bus_map[pci_bus] = 0;
+	} else
+		pci_to_OF_bus_map[pci_bus] = bus_range[0];
+
+	for (node=node->child; node != 0;node = node->sibling) {
+		struct pci_dev* dev;
+		unsigned int *class_code, *reg;
+	
+		class_code = (unsigned int *) get_property(node, "class-code", NULL);
+		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
+			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
+			continue;
+		reg = (unsigned int *)get_property(node, "reg", NULL);
+		if (!reg)
+			continue;
+		dev = pci_find_slot(pci_bus, ((reg[0] >> 8) & 0xff));
+		if (!dev || !dev->subordinate)
+			continue;
+		make_one_node_map(node, dev->subordinate->number);
+	}
+}
+	
+void
+pcibios_make_OF_bus_map(void)
+{
+	int i;
+	struct pci_controller* hose;
+	u8* of_prop_map;
+
+	pci_to_OF_bus_map = (u8*)kmalloc(pci_bus_count, GFP_KERNEL);
+	if (!pci_to_OF_bus_map) {
+		printk(KERN_ERR "Can't allocate OF bus map !\n");
+		return;
+	}
+
+	/* We fill the bus map with invalid values, that helps
+	 * debugging.
+	 */
+	for (i=0; i<pci_bus_count; i++)
+		pci_to_OF_bus_map[i] = 0xff;
+
+	/* For each hose, we begin searching bridges */
+	for(hose=hose_head; hose; hose=hose->next) {
+		struct device_node* node;	
+		node = (struct device_node *)hose->arch_data;
+		if (!node)
+			continue;
+		make_one_node_map(node, hose->first_busno);
+	}
+	of_prop_map = get_property(find_path_device("/"), "pci-OF-bus-map", NULL);
+	if (of_prop_map)
+		memcpy(of_prop_map, pci_to_OF_bus_map, pci_bus_count);
+#ifdef DEBUG
+	printk("PCI->OF bus map:\n");
+	for (i=0; i<pci_bus_count; i++) {
+		if (pci_to_OF_bus_map[i] == 0xff)
+			continue;
+		printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
+	}
+#endif
+}
+
+typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
+
+static struct device_node*
+scan_OF_pci_childs(struct device_node* node, pci_OF_scan_iterator filter, void* data)
+{
+	struct device_node* sub_node;
+
+	for (; node != 0;node = node->sibling) {
+		unsigned int *class_code;
+	
+		if (filter(node, data))
+			return node;
+
+		/* For PCI<->PCI bridges or CardBus bridges, we go down
+		 * Note: some OFs create a parent node "multifunc-device" as
+		 * a fake root for all functions of a multi-function device,
+		 * we go down them as well.
+		 */
+		class_code = (unsigned int *) get_property(node, "class-code", NULL);
+		if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
+			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
+			strcmp(node->name, "multifunc-device"))
+			continue;
+		sub_node = scan_OF_pci_childs(node->child, filter, data);
+		if (sub_node)
+			return sub_node;
+	}
+	return NULL;
+}
+
+static int
+scan_OF_pci_childs_iterator(struct device_node* node, void* data)
+{
+	unsigned int *reg;
+	u8* fdata = (u8*)data;
+	
+	reg = (unsigned int *) get_property(node, "reg", NULL);
+	if (reg && ((reg[0] >> 8) & 0xff) == fdata[1]
+		&& ((reg[0] >> 16) & 0xff) == fdata[0])
+		return 1;
+	return 0;
+}
+
+static struct device_node*
+scan_OF_childs_for_device(struct device_node* node, u8 bus, u8 dev_fn)
+{
+	u8 filter_data[2] = {bus, dev_fn};
+
+	return scan_OF_pci_childs(node, scan_OF_pci_childs_iterator, filter_data);
+}
+
+/*
+ * Scans the OF tree for a device node matching a PCI device
+ */
+struct device_node *
+pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
+{
+	struct pci_controller *hose;
+	struct device_node *node;
+	int busnr;
+
+	if (!have_of)
+		return NULL;
+	
+	/* Lookup the hose */
+	busnr = bus->number;
+	hose = pci_bus_to_hose(busnr);
+	if (!hose)
+		return NULL;
+
+	/* Check it has an OF node associated */
+	node = (struct device_node *) hose->arch_data;
+	if (!node)
+		return NULL;
+
+	/* Fixup bus number according to what OF think it is. */
+#ifdef CONFIG_PPC_PMAC
+	/* The G5 need a special case here. Basically, we don't remap all
+	 * busses on it so we don't create the pci-OF-map. However, we do
+	 * remap the AGP bus and so have to deal with it. A future better
+	 * fix has to be done by making the remapping per-host and always
+	 * filling the pci_to_OF map. --BenH
+	 */
+	if (_machine == _MACH_Pmac && busnr >= 0xf0)
+		busnr -= 0xf0;
+	else
+#endif
+	if (pci_to_OF_bus_map)
+		busnr = pci_to_OF_bus_map[busnr];
+	if (busnr == 0xff)
+		return NULL;
+	
+	/* Now, lookup childs of the hose */
+	return scan_OF_childs_for_device(node->child, busnr, devfn);
+}
+EXPORT_SYMBOL(pci_busdev_to_OF_node);
+
+struct device_node*
+pci_device_to_OF_node(struct pci_dev *dev)
+{
+	return pci_busdev_to_OF_node(dev->bus, dev->devfn);
+}
+EXPORT_SYMBOL(pci_device_to_OF_node);
+
+/* This routine is meant to be used early during boot, when the
+ * PCI bus numbers have not yet been assigned, and you need to
+ * issue PCI config cycles to an OF device.
+ * It could also be used to "fix" RTAS config cycles if you want
+ * to set pci_assign_all_buses to 1 and still use RTAS for PCI
+ * config cycles.
+ */
+struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
+{
+	if (!have_of)
+		return NULL;
+	while(node) {
+		struct pci_controller* hose;
+		for (hose=hose_head;hose;hose=hose->next)
+			if (hose->arch_data == node)
+				return hose;
+		node=node->parent;
+	}
+	return NULL;
+}
+
+static int
+find_OF_pci_device_filter(struct device_node* node, void* data)
+{
+	return ((void *)node == data);
+}
+
+/*
+ * Returns the PCI device matching a given OF node
+ */
+int
+pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
+{
+	unsigned int *reg;
+	struct pci_controller* hose;
+	struct pci_dev* dev = NULL;
+	
+	if (!have_of)
+		return -ENODEV;
+	/* Make sure it's really a PCI device */
+	hose = pci_find_hose_for_OF_device(node);
+	if (!hose || !hose->arch_data)
+		return -ENODEV;
+	if (!scan_OF_pci_childs(((struct device_node*)hose->arch_data)->child,
+			find_OF_pci_device_filter, (void *)node))
+		return -ENODEV;
+	reg = (unsigned int *) get_property(node, "reg", NULL);
+	if (!reg)
+		return -ENODEV;
+	*bus = (reg[0] >> 16) & 0xff;
+	*devfn = ((reg[0] >> 8) & 0xff);
+
+	/* Ok, here we need some tweak. If we have already renumbered
+	 * all busses, we can't rely on the OF bus number any more.
+	 * the pci_to_OF_bus_map is not enough as several PCI busses
+	 * may match the same OF bus number.
+	 */
+	if (!pci_to_OF_bus_map)
+		return 0;
+
+	for_each_pci_dev(dev)
+		if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
+				dev->devfn == *devfn) {
+			*bus = dev->bus->number;
+			pci_dev_put(dev);
+			return 0;
+		}
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL(pci_device_from_OF_node);
+
+void __init
+pci_process_bridge_OF_ranges(struct pci_controller *hose,
+			   struct device_node *dev, int primary)
+{
+	static unsigned int static_lc_ranges[256] __initdata;
+	unsigned int *dt_ranges, *lc_ranges, *ranges, *prev;
+	unsigned int size;
+	int rlen = 0, orig_rlen;
+	int memno = 0;
+	struct resource *res;
+	int np, na = prom_n_addr_cells(dev);
+	np = na + 5;
+
+	/* First we try to merge ranges to fix a problem with some pmacs
+	 * that can have more than 3 ranges, fortunately using contiguous
+	 * addresses -- BenH
+	 */
+	dt_ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
+	if (!dt_ranges)
+		return;
+	/* Sanity check, though hopefully that never happens */
+	if (rlen > sizeof(static_lc_ranges)) {
+		printk(KERN_WARNING "OF ranges property too large !\n");
+		rlen = sizeof(static_lc_ranges);
+	}
+	lc_ranges = static_lc_ranges;
+	memcpy(lc_ranges, dt_ranges, rlen);
+	orig_rlen = rlen;
+
+	/* Let's work on a copy of the "ranges" property instead of damaging
+	 * the device-tree image in memory
+	 */
+	ranges = lc_ranges;
+	prev = NULL;
+	while ((rlen -= np * sizeof(unsigned int)) >= 0) {
+		if (prev) {
+			if (prev[0] == ranges[0] && prev[1] == ranges[1] &&
+				(prev[2] + prev[na+4]) == ranges[2] &&
+				(prev[na+2] + prev[na+4]) == ranges[na+2]) {
+				prev[na+4] += ranges[na+4];
+				ranges[0] = 0;
+				ranges += np;
+				continue;
+			}
+		}
+		prev = ranges;
+		ranges += np;
+	}
+
+	/*
+	 * The ranges property is laid out as an array of elements,
+	 * each of which comprises:
+	 *   cells 0 - 2:	a PCI address
+	 *   cells 3 or 3+4:	a CPU physical address
+	 *			(size depending on dev->n_addr_cells)
+	 *   cells 4+5 or 5+6:	the size of the range
+	 */
+	ranges = lc_ranges;
+	rlen = orig_rlen;
+	while (ranges && (rlen -= np * sizeof(unsigned int)) >= 0) {
+		res = NULL;
+		size = ranges[na+4];
+		switch ((ranges[0] >> 24) & 0x3) {
+		case 1:		/* I/O space */
+			if (ranges[2] != 0)
+				break;
+			hose->io_base_phys = ranges[na+2];
+			/* limit I/O space to 16MB */
+			if (size > 0x01000000)
+				size = 0x01000000;
+			hose->io_base_virt = ioremap(ranges[na+2], size);
+			if (primary)
+				isa_io_base = (unsigned long) hose->io_base_virt;
+			res = &hose->io_resource;
+			res->flags = IORESOURCE_IO;
+			res->start = ranges[2];
+			DBG("PCI: IO 0x%lx -> 0x%lx\n",
+				    res->start, res->start + size - 1);
+			break;
+		case 2:		/* memory space */
+			memno = 0;
+			if (ranges[1] == 0 && ranges[2] == 0
+			    && ranges[na+4] <= (16 << 20)) {
+				/* 1st 16MB, i.e. ISA memory area */
+				if (primary)
+					isa_mem_base = ranges[na+2];
+				memno = 1;
+			}
+			while (memno < 3 && hose->mem_resources[memno].flags)
+				++memno;
+			if (memno == 0)
+				hose->pci_mem_offset = ranges[na+2] - ranges[2];
+			if (memno < 3) {
+				res = &hose->mem_resources[memno];
+				res->flags = IORESOURCE_MEM;
+				if(ranges[0] & 0x40000000)
+					res->flags |= IORESOURCE_PREFETCH;
+				res->start = ranges[na+2];
+				DBG("PCI: MEM[%d] 0x%lx -> 0x%lx\n", memno,
+					    res->start, res->start + size - 1);
+			}
+			break;
+		}
+		if (res != NULL) {
+			res->name = dev->full_name;
+			res->end = res->start + size - 1;
+			res->parent = NULL;
+			res->sibling = NULL;
+			res->child = NULL;
+		}
+		ranges += np;
+	}
+}
+
+/* We create the "pci-OF-bus-map" property now so it appears in the
+ * /proc device tree
+ */
+void __init
+pci_create_OF_bus_map(void)
+{
+	struct property* of_prop;
+	
+	of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
+	if (of_prop && find_path_device("/")) {
+		memset(of_prop, -1, sizeof(struct property) + 256);
+		of_prop->name = "pci-OF-bus-map";
+		of_prop->length = 256;
+		of_prop->value = (unsigned char *)&of_prop[1];
+		prom_add_property(find_path_device("/"), of_prop);
+	}
+}
+
+static ssize_t pci_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct pci_dev *pdev;
+	struct device_node *np;
+
+	pdev = to_pci_dev (dev);
+	np = pci_device_to_OF_node(pdev);
+	if (np == NULL || np->full_name == NULL)
+		return 0;
+	return sprintf(buf, "%s", np->full_name);
+}
+static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
+
+#else /* CONFIG_PPC_OF */
+void pcibios_make_OF_bus_map(void)
+{
+}
+#endif /* CONFIG_PPC_OF */
+
+/* Add sysfs properties */
+void pcibios_add_platform_entries(struct pci_dev *pdev)
+{
+#ifdef CONFIG_PPC_OF
+	device_create_file(&pdev->dev, &dev_attr_devspec);
+#endif /* CONFIG_PPC_OF */
+}
+
+
+#ifdef CONFIG_PPC_PMAC
+/*
+ * This set of routines checks for PCI<->PCI bridges that have closed
+ * IO resources and have child devices. It tries to re-open an IO
+ * window on them.
+ *
+ * This is a _temporary_ fix to workaround a problem with Apple's OF
+ * closing IO windows on P2P bridges when the OF drivers of cards
+ * below this bridge don't claim any IO range (typically ATI or
+ * Adaptec).
+ *
+ * A more complete fix would be to use drivers/pci/setup-bus.c, which
+ * involves a working pcibios_fixup_pbus_ranges(), some more care about
+ * ordering when creating the host bus resources, and maybe a few more
+ * minor tweaks
+ */
+
+/* Initialize bridges with base/limit values we have collected */
+static void __init
+do_update_p2p_io_resource(struct pci_bus *bus, int enable_vga)
+{
+	struct pci_dev *bridge = bus->self;
+	struct pci_controller* hose = (struct pci_controller *)bridge->sysdata;
+	u32 l;
+	u16 w;
+	struct resource res;
+
+	if (bus->resource[0] == NULL)
+		return;
+ 	res = *(bus->resource[0]);
+
+	DBG("Remapping Bus %d, bridge: %s\n", bus->number, pci_name(bridge));
+	res.start -= ((unsigned long) hose->io_base_virt - isa_io_base);
+	res.end -= ((unsigned long) hose->io_base_virt - isa_io_base);
+	DBG("  IO window: %08lx-%08lx\n", res.start, res.end);
+
+	/* Set up the top and bottom of the PCI I/O segment for this bus. */
+	pci_read_config_dword(bridge, PCI_IO_BASE, &l);
+	l &= 0xffff000f;
+	l |= (res.start >> 8) & 0x00f0;
+	l |= res.end & 0xf000;
+	pci_write_config_dword(bridge, PCI_IO_BASE, l);
+
+	if ((l & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
+		l = (res.start >> 16) | (res.end & 0xffff0000);
+		pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, l);
+	}
+
+	pci_read_config_word(bridge, PCI_COMMAND, &w);
+	w |= PCI_COMMAND_IO;
+	pci_write_config_word(bridge, PCI_COMMAND, w);
+
+#if 0 /* Enabling this causes XFree 4.2.0 to hang during PCI probe */
+	if (enable_vga) {
+		pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, &w);
+		w |= PCI_BRIDGE_CTL_VGA;
+		pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, w);
+	}
+#endif
+}
+
+/* This function is pretty basic and actually quite broken for the
+ * general case, it's enough for us right now though. It's supposed
+ * to tell us if we need to open an IO range at all or not and what
+ * size.
+ */
+static int __init
+check_for_io_childs(struct pci_bus *bus, struct resource* res, int *found_vga)
+{
+	struct pci_dev *dev;
+	int	i;
+	int	rc = 0;
+
+#define push_end(res, size) do { unsigned long __sz = (size) ; \
+	res->end = ((res->end + __sz) / (__sz + 1)) * (__sz + 1) + __sz; \
+    } while (0)
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		u16 class = dev->class >> 8;
+
+		if (class == PCI_CLASS_DISPLAY_VGA ||
+		    class == PCI_CLASS_NOT_DEFINED_VGA)
+			*found_vga = 1;
+		if (class >> 8 == PCI_BASE_CLASS_BRIDGE && dev->subordinate)
+			rc |= check_for_io_childs(dev->subordinate, res, found_vga);
+		if (class == PCI_CLASS_BRIDGE_CARDBUS)
+			push_end(res, 0xfff);
+
+		for (i=0; i<PCI_NUM_RESOURCES; i++) {
+			struct resource *r;
+			unsigned long r_size;
+
+			if (dev->class >> 8 == PCI_CLASS_BRIDGE_PCI
+			    && i >= PCI_BRIDGE_RESOURCES)
+				continue;
+			r = &dev->resource[i];
+			r_size = r->end - r->start;
+			if (r_size < 0xfff)
+				r_size = 0xfff;
+			if (r->flags & IORESOURCE_IO && (r_size) != 0) {
+				rc = 1;
+				push_end(res, r_size);
+			}
+		}
+	}
+
+	return rc;
+}
+
+/* Here we scan all P2P bridges of a given level that have a closed
+ * IO window. Note that the test for the presence of a VGA card should
+ * be improved to take into account already configured P2P bridges,
+ * currently, we don't see them and might end up configuring 2 bridges
+ * with VGA pass through enabled
+ */
+static void __init
+do_fixup_p2p_level(struct pci_bus *bus)
+{
+	struct pci_bus *b;
+	int i, parent_io;
+	int has_vga = 0;
+
+	for (parent_io=0; parent_io<4; parent_io++)
+		if (bus->resource[parent_io]
+		    && bus->resource[parent_io]->flags & IORESOURCE_IO)
+			break;
+	if (parent_io >= 4)
+		return;
+
+	list_for_each_entry(b, &bus->children, node) {
+		struct pci_dev *d = b->self;
+		struct pci_controller* hose = (struct pci_controller *)d->sysdata;
+		struct resource *res = b->resource[0];
+		struct resource tmp_res;
+		unsigned long max;
+		int found_vga = 0;
+
+		memset(&tmp_res, 0, sizeof(tmp_res));
+		tmp_res.start = bus->resource[parent_io]->start;
+
+		/* We don't let low addresses go through that closed P2P bridge, well,
+		 * that may not be necessary but I feel safer that way
+		 */
+		if (tmp_res.start == 0)
+			tmp_res.start = 0x1000;
+	
+		if (!list_empty(&b->devices) && res && res->flags == 0 &&
+		    res != bus->resource[parent_io] &&
+		    (d->class >> 8) == PCI_CLASS_BRIDGE_PCI &&
+		    check_for_io_childs(b, &tmp_res, &found_vga)) {
+			u8 io_base_lo;
+
+			printk(KERN_INFO "Fixing up IO bus %s\n", b->name);
+
+			if (found_vga) {
+				if (has_vga) {
+					printk(KERN_WARNING "Skipping VGA, already active"
+					    " on bus segment\n");
+					found_vga = 0;
+				} else
+					has_vga = 1;
+			}
+			pci_read_config_byte(d, PCI_IO_BASE, &io_base_lo);
+
+			if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32)
+				max = ((unsigned long) hose->io_base_virt
+					- isa_io_base) + 0xffffffff;
+			else
+				max = ((unsigned long) hose->io_base_virt
+					- isa_io_base) + 0xffff;
+
+			*res = tmp_res;
+			res->flags = IORESOURCE_IO;
+			res->name = b->name;
+		
+			/* Find a resource in the parent where we can allocate */
+			for (i = 0 ; i < 4; i++) {
+				struct resource *r = bus->resource[i];
+				if (!r)
+					continue;
+				if ((r->flags & IORESOURCE_IO) == 0)
+					continue;
+				DBG("Trying to allocate from %08lx, size %08lx from parent"
+				    " res %d: %08lx -> %08lx\n",
+					res->start, res->end, i, r->start, r->end);
+			
+				if (allocate_resource(r, res, res->end + 1, res->start, max,
+				    res->end + 1, NULL, NULL) < 0) {
+					DBG("Failed !\n");
+					continue;
+				}
+				do_update_p2p_io_resource(b, found_vga);
+				break;
+			}
+		}
+		do_fixup_p2p_level(b);
+	}
+}
+
+static void
+pcibios_fixup_p2p_bridges(void)
+{
+	struct pci_bus *b;
+
+	list_for_each_entry(b, &pci_root_buses, node)
+		do_fixup_p2p_level(b);
+}
+
+#endif /* CONFIG_PPC_PMAC */
+
+static int __init
+pcibios_init(void)
+{
+	struct pci_controller *hose;
+	struct pci_bus *bus;
+	int next_busno;
+
+	printk(KERN_INFO "PCI: Probing PCI hardware\n");
+
+	/* Scan all of the recorded PCI controllers.  */
+	for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
+		if (pci_assign_all_buses)
+			hose->first_busno = next_busno;
+		hose->last_busno = 0xff;
+		bus = pci_scan_bus(hose->first_busno, hose->ops, hose);
+		hose->last_busno = bus->subordinate;
+		if (pci_assign_all_buses || next_busno <= hose->last_busno)
+			next_busno = hose->last_busno + pcibios_assign_bus_offset;
+	}
+	pci_bus_count = next_busno;
+
+	/* OpenFirmware based machines need a map of OF bus
+	 * numbers vs. kernel bus numbers since we may have to
+	 * remap them.
+	 */
+	if (pci_assign_all_buses && have_of)
+		pcibios_make_OF_bus_map();
+
+	/* Do machine dependent PCI interrupt routing */
+	if (ppc_md.pci_swizzle && ppc_md.pci_map_irq)
+		pci_fixup_irqs(ppc_md.pci_swizzle, ppc_md.pci_map_irq);
+
+	/* Call machine dependent fixup */
+	if (ppc_md.pcibios_fixup)
+		ppc_md.pcibios_fixup();
+
+	/* Allocate and assign resources */
+	pcibios_allocate_bus_resources(&pci_root_buses);
+	pcibios_allocate_resources(0);
+	pcibios_allocate_resources(1);
+#ifdef CONFIG_PPC_PMAC
+	pcibios_fixup_p2p_bridges();
+#endif /* CONFIG_PPC_PMAC */
+	pcibios_assign_resources();
+
+	/* Call machine dependent post-init code */
+	if (ppc_md.pcibios_after_init)
+		ppc_md.pcibios_after_init();
+
+	return 0;
+}
+
+subsys_initcall(pcibios_init);
+
+unsigned char __init
+common_swizzle(struct pci_dev *dev, unsigned char *pinp)
+{
+	struct pci_controller *hose = dev->sysdata;
+
+	if (dev->bus->number != hose->first_busno) {
+		u8 pin = *pinp;
+		do {
+			pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
+			/* Move up the chain of bridges. */
+			dev = dev->bus->self;
+		} while (dev->bus->self);
+		*pinp = pin;
+
+		/* The slot is the idsel of the last bridge. */
+	}
+	return PCI_SLOT(dev->devfn);
+}
+
+unsigned long resource_fixup(struct pci_dev * dev, struct resource * res,
+			     unsigned long start, unsigned long size)
+{
+	return start;
+}
+
+void __init pcibios_fixup_bus(struct pci_bus *bus)
+{
+	struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
+	unsigned long io_offset;
+	struct resource *res;
+	int i;
+
+	io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
+	if (bus->parent == NULL) {
+		/* This is a host bridge - fill in its resources */
+		hose->bus = bus;
+
+		bus->resource[0] = res = &hose->io_resource;
+		if (!res->flags) {
+			if (io_offset)
+				printk(KERN_ERR "I/O resource not set for host"
+				       " bridge %d\n", hose->index);
+			res->start = 0;
+			res->end = IO_SPACE_LIMIT;
+			res->flags = IORESOURCE_IO;
+		}
+		res->start += io_offset;
+		res->end += io_offset;
+
+		for (i = 0; i < 3; ++i) {
+			res = &hose->mem_resources[i];
+			if (!res->flags) {
+				if (i > 0)
+					continue;
+				printk(KERN_ERR "Memory resource not set for "
+				       "host bridge %d\n", hose->index);
+				res->start = hose->pci_mem_offset;
+				res->end = ~0U;
+				res->flags = IORESOURCE_MEM;
+			}
+			bus->resource[i+1] = res;
+		}
+	} else {
+		/* This is a subordinate bridge */
+		pci_read_bridge_bases(bus);
+
+		for (i = 0; i < 4; ++i) {
+			if ((res = bus->resource[i]) == NULL)
+				continue;
+			if (!res->flags)
+				continue;
+			if (io_offset && (res->flags & IORESOURCE_IO)) {
+				res->start += io_offset;
+				res->end += io_offset;
+			} else if (hose->pci_mem_offset
+				   && (res->flags & IORESOURCE_MEM)) {
+				res->start += hose->pci_mem_offset;
+				res->end += hose->pci_mem_offset;
+			}
+		}
+	}
+
+	if (ppc_md.pcibios_fixup_bus)
+		ppc_md.pcibios_fixup_bus(bus);
+}
+
+char __init *pcibios_setup(char *str)
+{
+	return str;
+}
+
+/* the next one is stolen from the alpha port... */
+void __init
+pcibios_update_irq(struct pci_dev *dev, int irq)
+{
+	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+	/* XXX FIXME - update OF device tree node interrupt property */
+}
+
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+	u16 cmd, old_cmd;
+	int idx;
+	struct resource *r;
+
+	if (ppc_md.pcibios_enable_device_hook)
+		if (ppc_md.pcibios_enable_device_hook(dev, 0))
+			return -EINVAL;
+		
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+	old_cmd = cmd;
+	for (idx=0; idx<6; idx++) {
+		r = &dev->resource[idx];
+		if (r->flags & IORESOURCE_UNSET) {
+			printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
+			return -EINVAL;
+		}
+		if (r->flags & IORESOURCE_IO)
+			cmd |= PCI_COMMAND_IO;
+		if (r->flags & IORESOURCE_MEM)
+			cmd |= PCI_COMMAND_MEMORY;
+	}
+	if (cmd != old_cmd) {
+		printk("PCI: Enabling device %s (%04x -> %04x)\n",
+		       pci_name(dev), old_cmd, cmd);
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+	}
+	return 0;
+}
+
+struct pci_controller*
+pci_bus_to_hose(int bus)
+{
+	struct pci_controller* hose = hose_head;
+
+	for (; hose; hose = hose->next)
+		if (bus >= hose->first_busno && bus <= hose->last_busno)
+			return hose;
+	return NULL;
+}
+
+void __iomem *
+pci_bus_io_base(unsigned int bus)
+{
+	struct pci_controller *hose;
+
+	hose = pci_bus_to_hose(bus);
+	if (!hose)
+		return NULL;
+	return hose->io_base_virt;
+}
+
+unsigned long
+pci_bus_io_base_phys(unsigned int bus)
+{
+	struct pci_controller *hose;
+
+	hose = pci_bus_to_hose(bus);
+	if (!hose)
+		return 0;
+	return hose->io_base_phys;
+}
+
+unsigned long
+pci_bus_mem_base_phys(unsigned int bus)
+{
+	struct pci_controller *hose;
+
+	hose = pci_bus_to_hose(bus);
+	if (!hose)
+		return 0;
+	return hose->pci_mem_offset;
+}
+
+unsigned long
+pci_resource_to_bus(struct pci_dev *pdev, struct resource *res)
+{
+	/* Hack alert again ! See comments in chrp_pci.c
+	 */
+	struct pci_controller* hose =
+		(struct pci_controller *)pdev->sysdata;
+	if (hose && res->flags & IORESOURCE_MEM)
+		return res->start - hose->pci_mem_offset;
+	/* We may want to do something with IOs here... */
+	return res->start;
+}
+
+
+static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
+					       unsigned long *offset,
+					       enum pci_mmap_state mmap_state)
+{
+	struct pci_controller *hose = pci_bus_to_hose(dev->bus->number);
+	unsigned long io_offset = 0;
+	int i, res_bit;
+
+	if (hose == 0)
+		return NULL;		/* should never happen */
+
+	/* If memory, add on the PCI bridge address offset */
+	if (mmap_state == pci_mmap_mem) {
+		*offset += hose->pci_mem_offset;
+		res_bit = IORESOURCE_MEM;
+	} else {
+		io_offset = hose->io_base_virt - ___IO_BASE;
+		*offset += io_offset;
+		res_bit = IORESOURCE_IO;
+	}
+
+	/*
+	 * Check that the offset requested corresponds to one of the
+	 * resources of the device.
+	 */
+	for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
+		struct resource *rp = &dev->resource[i];
+		int flags = rp->flags;
+
+		/* treat ROM as memory (should be already) */
+		if (i == PCI_ROM_RESOURCE)
+			flags |= IORESOURCE_MEM;
+
+		/* Active and same type? */
+		if ((flags & res_bit) == 0)
+			continue;
+
+		/* In the range of this resource? */
+		if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
+			continue;
+
+		/* found it! construct the final physical address */
+		if (mmap_state == pci_mmap_io)
+			*offset += hose->io_base_phys - io_offset;
+		return rp;
+	}
+
+	return NULL;
+}
+
+/*
+ * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
+ * device mapping.
+ */
+static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp,
+				      pgprot_t protection,
+				      enum pci_mmap_state mmap_state,
+				      int write_combine)
+{
+	unsigned long prot = pgprot_val(protection);
+
+	/* Write combine is always 0 on non-memory space mappings. On
+	 * memory space, if the user didn't pass 1, we check for a
+	 * "prefetchable" resource. This is a bit hackish, but we use
+	 * this to workaround the inability of /sysfs to provide a write
+	 * combine bit
+	 */
+	if (mmap_state != pci_mmap_mem)
+		write_combine = 0;
+	else if (write_combine == 0) {
+		if (rp->flags & IORESOURCE_PREFETCH)
+			write_combine = 1;
+	}
+
+	/* XXX would be nice to have a way to ask for write-through */
+	prot |= _PAGE_NO_CACHE;
+	if (write_combine)
+		prot &= ~_PAGE_GUARDED;
+	else
+		prot |= _PAGE_GUARDED;
+
+	printk("PCI map for %s:%lx, prot: %lx\n", pci_name(dev), rp->start,
+	       prot);
+
+	return __pgprot(prot);
+}
+
+/*
+ * This one is used by /dev/mem and fbdev who have no clue about the
+ * PCI device, it tries to find the PCI device first and calls the
+ * above routine
+ */
+pgprot_t pci_phys_mem_access_prot(struct file *file,
+				  unsigned long pfn,
+				  unsigned long size,
+				  pgprot_t protection)
+{
+	struct pci_dev *pdev = NULL;
+	struct resource *found = NULL;
+	unsigned long prot = pgprot_val(protection);
+	unsigned long offset = pfn << PAGE_SHIFT;
+	int i;
+
+	if (page_is_ram(pfn))
+		return prot;
+
+	prot |= _PAGE_NO_CACHE | _PAGE_GUARDED;
+
+	for_each_pci_dev(pdev) {
+		for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
+			struct resource *rp = &pdev->resource[i];
+			int flags = rp->flags;
+
+			/* Active and same type? */
+			if ((flags & IORESOURCE_MEM) == 0)
+				continue;
+			/* In the range of this resource? */
+			if (offset < (rp->start & PAGE_MASK) ||
+			    offset > rp->end)
+				continue;
+			found = rp;
+			break;
+		}
+		if (found)
+			break;
+	}
+	if (found) {
+		if (found->flags & IORESOURCE_PREFETCH)
+			prot &= ~_PAGE_GUARDED;
+		pci_dev_put(pdev);
+	}
+
+	DBG("non-PCI map for %lx, prot: %lx\n", offset, prot);
+
+	return __pgprot(prot);
+}
+
+
+/*
+ * Perform the actual remap of the pages for a PCI device mapping, as
+ * appropriate for this architecture.  The region in the process to map
+ * is described by vm_start and vm_end members of VMA, the base physical
+ * address is found in vm_pgoff.
+ * The pci device structure is provided so that architectures may make mapping
+ * decisions on a per-device or per-bus basis.
+ *
+ * Returns a negative error code on failure, zero on success.
+ */
+int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+			enum pci_mmap_state mmap_state,
+			int write_combine)
+{
+	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+	struct resource *rp;
+	int ret;
+
+	rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
+	if (rp == NULL)
+		return -EINVAL;
+
+	vma->vm_pgoff = offset >> PAGE_SHIFT;
+	vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
+	vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
+						  vma->vm_page_prot,
+						  mmap_state, write_combine);
+
+	ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+			       vma->vm_end - vma->vm_start, vma->vm_page_prot);
+
+	return ret;
+}
+
+/* Obsolete functions. Should be removed once the symbios driver
+ * is fixed
+ */
+unsigned long
+phys_to_bus(unsigned long pa)
+{
+	struct pci_controller *hose;
+	int i;
+
+	for (hose = hose_head; hose; hose = hose->next) {
+		for (i = 0; i < 3; ++i) {
+			if (pa >= hose->mem_resources[i].start
+			    && pa <= hose->mem_resources[i].end) {
+				/*
+				 * XXX the hose->pci_mem_offset really
+				 * only applies to mem_resources[0].
+				 * We need a way to store an offset for
+				 * the others.  -- paulus
+				 */
+				if (i == 0)
+					pa -= hose->pci_mem_offset;
+				return pa;
+			}
+		}
+	}
+	/* hmmm, didn't find it */
+	return 0;
+}
+
+unsigned long
+pci_phys_to_bus(unsigned long pa, int busnr)
+{
+	struct pci_controller* hose = pci_bus_to_hose(busnr);
+	if (!hose)
+		return pa;
+	return pa - hose->pci_mem_offset;
+}
+
+unsigned long
+pci_bus_to_phys(unsigned int ba, int busnr)
+{
+	struct pci_controller* hose = pci_bus_to_hose(busnr);
+	if (!hose)
+		return ba;
+	return ba + hose->pci_mem_offset;
+}
+
+/* Provide information on locations of various I/O regions in physical
+ * memory.  Do this on a per-card basis so that we choose the right
+ * root bridge.
+ * Note that the returned IO or memory base is a physical address
+ */
+
+long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
+{
+	struct pci_controller* hose;
+	long result = -EOPNOTSUPP;
+
+	/* Argh ! Please forgive me for that hack, but that's the
+	 * simplest way to get existing XFree to not lockup on some
+	 * G5 machines... So when something asks for bus 0 io base
+	 * (bus 0 is HT root), we return the AGP one instead.
+	 */
+#ifdef CONFIG_PPC_PMAC
+	if (_machine == _MACH_Pmac && machine_is_compatible("MacRISC4"))
+		if (bus == 0)
+			bus = 0xf0;
+#endif /* CONFIG_PPC_PMAC */
+
+	hose = pci_bus_to_hose(bus);
+	if (!hose)
+		return -ENODEV;
+
+	switch (which) {
+	case IOBASE_BRIDGE_NUMBER:
+		return (long)hose->first_busno;
+	case IOBASE_MEMORY:
+		return (long)hose->pci_mem_offset;
+	case IOBASE_IO:
+		return (long)hose->io_base_phys;
+	case IOBASE_ISA_IO:
+		return (long)isa_io_base;
+	case IOBASE_ISA_MEM:
+		return (long)isa_mem_base;
+	}
+
+	return result;
+}
+
+void pci_resource_to_user(const struct pci_dev *dev, int bar,
+			  const struct resource *rsrc,
+			  u64 *start, u64 *end)
+{
+	struct pci_controller *hose = pci_bus_to_hose(dev->bus->number);
+	unsigned long offset = 0;
+
+	if (hose == NULL)
+		return;
+
+	if (rsrc->flags & IORESOURCE_IO)
+		offset = ___IO_BASE - hose->io_base_virt + hose->io_base_phys;
+
+	*start = rsrc->start + offset;
+	*end = rsrc->end + offset;
+}
+
+void __init
+pci_init_resource(struct resource *res, unsigned long start, unsigned long end,
+		  int flags, char *name)
+{
+	res->start = start;
+	res->end = end;
+	res->flags = flags;
+	res->name = name;
+	res->parent = NULL;
+	res->sibling = NULL;
+	res->child = NULL;
+}
+
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max)
+{
+	unsigned long start = pci_resource_start(dev, bar);
+	unsigned long len = pci_resource_len(dev, bar);
+	unsigned long flags = pci_resource_flags(dev, bar);
+
+	if (!len)
+		return NULL;
+	if (max && len > max)
+		len = max;
+	if (flags & IORESOURCE_IO)
+		return ioport_map(start, len);
+	if (flags & IORESOURCE_MEM)
+		/* Not checking IORESOURCE_CACHEABLE because PPC does
+		 * not currently distinguish between ioremap and
+		 * ioremap_nocache.
+		 */
+		return ioremap(start, len);
+	/* What? */
+	return NULL;
+}
+
+void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
+{
+	/* Nothing to do */
+}
+EXPORT_SYMBOL(pci_iomap);
+EXPORT_SYMBOL(pci_iounmap);
+
+unsigned long pci_address_to_pio(phys_addr_t address)
+{
+	struct pci_controller* hose = hose_head;
+
+	for (; hose; hose = hose->next) {
+		unsigned int size = hose->io_resource.end -
+			hose->io_resource.start + 1;
+		if (address >= hose->io_base_phys &&
+		    address < (hose->io_base_phys + size)) {
+			unsigned long base =
+				(unsigned long)hose->io_base_virt - _IO_BASE;
+			return base + (address - hose->io_base_phys);
+		}
+	}
+	return (unsigned int)-1;
+}
+EXPORT_SYMBOL(pci_address_to_pio);
+
+/*
+ * Null PCI config access functions, for the case when we can't
+ * find a hose.
+ */
+#define NULL_PCI_OP(rw, size, type)					\
+static int								\
+null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)	\
+{									\
+	return PCIBIOS_DEVICE_NOT_FOUND;    				\
+}
+
+static int
+null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
+		 int len, u32 *val)
+{
+	return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static int
+null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
+		  int len, u32 val)
+{
+	return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static struct pci_ops null_pci_ops =
+{
+	null_read_config,
+	null_write_config
+};
+
+/*
+ * These functions are used early on before PCI scanning is done
+ * and all of the pci_dev and pci_bus structures have been created.
+ */
+static struct pci_bus *
+fake_pci_bus(struct pci_controller *hose, int busnr)
+{
+	static struct pci_bus bus;
+
+	if (hose == 0) {
+		hose = pci_bus_to_hose(busnr);
+		if (hose == 0)
+			printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
+	}
+	bus.number = busnr;
+	bus.sysdata = hose;
+	bus.ops = hose? hose->ops: &null_pci_ops;
+	return &bus;
+}
+
+#define EARLY_PCI_OP(rw, size, type)					\
+int early_##rw##_config_##size(struct pci_controller *hose, int bus,	\
+			       int devfn, int offset, type value)	\
+{									\
+	return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),	\
+					    devfn, offset, value);	\
+}
+
+EARLY_PCI_OP(read, byte, u8 *)
+EARLY_PCI_OP(read, word, u16 *)
+EARLY_PCI_OP(read, dword, u32 *)
+EARLY_PCI_OP(write, byte, u8)
+EARLY_PCI_OP(write, word, u16)
+EARLY_PCI_OP(write, dword, u32)

arch/ppc/kernel/Makefile

···
 obj-$(CONFIG_SOFTWARE_SUSPEND)	+= swsusp.o
 obj-$(CONFIG_MODULES)		+= module.o
 obj-$(CONFIG_NOT_COHERENT_CACHE)	+= dma-mapping.o
-obj-$(CONFIG_PCI)		+= pci.o
 obj-$(CONFIG_KGDB)		+= ppc-stub.o
 obj-$(CONFIG_TAU)		+= temp.o
 ifndef CONFIG_E200