Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

Conflicts:

	arch/x86/kernel/io_apic.c

1 files changed, 898 insertions, 0 deletions

diff --git a/arch/sparc/kernel/of_device_64.c b/arch/sparc/kernel/of_device_64.c
new file mode 100644
index 00000000000..4873f28905b
--- /dev/null
+++ b/arch/sparc/kernel/of_device_64.c
@@ -0,0 +1,898 @@
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/irq.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+
+void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
+{
+	unsigned long ret = res->start + offset;
+	struct resource *r;
+
+	if (res->flags & IORESOURCE_MEM)
+		r = request_mem_region(ret, size, name);
+	else
+		r = request_region(ret, size, name);
+	if (!r)
+		ret = 0;
+
+	return (void __iomem *) ret;
+}
+EXPORT_SYMBOL(of_ioremap);
+
+void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
+{
+	if (res->flags & IORESOURCE_MEM)
+		release_mem_region((unsigned long) base, size);
+	else
+		release_region((unsigned long) base, size);
+}
+EXPORT_SYMBOL(of_iounmap);
+
+static int node_match(struct device *dev, void *data)
+{
+	struct of_device *op = to_of_device(dev);
+	struct device_node *dp = data;
+
+	return (op->node == dp);
+}
+
+struct of_device *of_find_device_by_node(struct device_node *dp)
+{
+	struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
+					     dp, node_match);
+
+	if (dev)
+		return to_of_device(dev);
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_find_device_by_node);
+
+unsigned int irq_of_parse_and_map(struct device_node *node, int index)
+{
+	struct of_device *op = of_find_device_by_node(node);
+
+	if (!op || index >= op->num_irqs)
+		return 0;
+
+	return op->irqs[index];
+}
+EXPORT_SYMBOL(irq_of_parse_and_map);
+
+/* Take the archdata values for IOMMU, STC, and HOSTDATA found in
+ * BUS and propagate to all child of_device objects.
+ */
+void of_propagate_archdata(struct of_device *bus)
+{
+	struct dev_archdata *bus_sd = &bus->dev.archdata;
+	struct device_node *bus_dp = bus->node;
+	struct device_node *dp;
+
+	for (dp = bus_dp->child; dp; dp = dp->sibling) {
+		struct of_device *op = of_find_device_by_node(dp);
+
+		op->dev.archdata.iommu = bus_sd->iommu;
+		op->dev.archdata.stc = bus_sd->stc;
+		op->dev.archdata.host_controller = bus_sd->host_controller;
+		op->dev.archdata.numa_node = bus_sd->numa_node;
+
+		if (dp->child)
+			of_propagate_archdata(op);
+	}
+}
+
+struct bus_type of_platform_bus_type;
+EXPORT_SYMBOL(of_platform_bus_type);
+
+static inline u64 of_read_addr(const u32 *cell, int size)
+{
+	u64 r = 0;
+	while (size--)
+		r = (r << 32) | *(cell++);
+	return r;
+}
+
+static void __init get_cells(struct device_node *dp,
+			     int *addrc, int *sizec)
+{
+	if (addrc)
+		*addrc = of_n_addr_cells(dp);
+	if (sizec)
+		*sizec = of_n_size_cells(dp);
+}
+
+/* Max address size we deal with */
+#define OF_MAX_ADDR_CELLS	4
+
+struct of_bus {
+	const char	*name;
+	const char	*addr_prop_name;
+	int		(*match)(struct device_node *parent);
+	void		(*count_cells)(struct device_node *child,
+				       int *addrc, int *sizec);
+	int		(*map)(u32 *addr, const u32 *range,
+			       int na, int ns, int pna);
+	unsigned long	(*get_flags)(const u32 *addr, unsigned long);
+};
+
+/*
+ * Default translator (generic bus)
+ */
+
+static void of_bus_default_count_cells(struct device_node *dev,
+				       int *addrc, int *sizec)
+{
+	get_cells(dev, addrc, sizec);
+}
+
+/* Make sure the least significant 64-bits are in-range.  Even
+ * for 3 or 4 cell values it is a good enough approximation.
+ */
+static int of_out_of_range(const u32 *addr, const u32 *base,
+			   const u32 *size, int na, int ns)
+{
+	u64 a = of_read_addr(addr, na);
+	u64 b = of_read_addr(base, na);
+
+	if (a < b)
+		return 1;
+
+	b += of_read_addr(size, ns);
+	if (a >= b)
+		return 1;
+
+	return 0;
+}
+
+static int of_bus_default_map(u32 *addr, const u32 *range,
+			      int na, int ns, int pna)
+{
+	u32 result[OF_MAX_ADDR_CELLS];
+	int i;
+
+	if (ns > 2) {
+		printk("of_device: Cannot handle size cells (%d) > 2.", ns);
+		return -EINVAL;
+	}
+
+	if (of_out_of_range(addr, range, range + na + pna, na, ns))
+		return -EINVAL;
+
+	/* Start with the parent range base.  */
+	memcpy(result, range + na, pna * 4);
+
+	/* Add in the child address offset.  */
+	for (i = 0; i < na; i++)
+		result[pna - 1 - i] +=
+			(addr[na - 1 - i] -
+			 range[na - 1 - i]);
+
+	memcpy(addr, result, pna * 4);
+
+	return 0;
+}
+
+static unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
+{
+	if (flags)
+		return flags;
+	return IORESOURCE_MEM;
+}
+
+/*
+ * PCI bus specific translator
+ */
+
+static int of_bus_pci_match(struct device_node *np)
+{
+	if (!strcmp(np->name, "pci")) {
+		const char *model = of_get_property(np, "model", NULL);
+
+		if (model && !strcmp(model, "SUNW,simba"))
+			return 0;
+
+		/* Do not do PCI specific frobbing if the
+		 * PCI bridge lacks a ranges property.  We
+		 * want to pass it through up to the next
+		 * parent as-is, not with the PCI translate
+		 * method which chops off the top address cell.
+		 */
+		if (!of_find_property(np, "ranges", NULL))
+			return 0;
+
+		return 1;
+	}
+
+	return 0;
+}
+
+static int of_bus_simba_match(struct device_node *np)
+{
+	const char *model = of_get_property(np, "model", NULL);
+
+	if (model && !strcmp(model, "SUNW,simba"))
+		return 1;
+
+	/* Treat PCI busses lacking ranges property just like
+	 * simba.
+	 */
+	if (!strcmp(np->name, "pci")) {
+		if (!of_find_property(np, "ranges", NULL))
+			return 1;
+	}
+
+	return 0;
+}
+
+static int of_bus_simba_map(u32 *addr, const u32 *range,
+			    int na, int ns, int pna)
+{
+	return 0;
+}
+
+static void of_bus_pci_count_cells(struct device_node *np,
+				   int *addrc, int *sizec)
+{
+	if (addrc)
+		*addrc = 3;
+	if (sizec)
+		*sizec = 2;
+}
+
+static int of_bus_pci_map(u32 *addr, const u32 *range,
+			  int na, int ns, int pna)
+{
+	u32 result[OF_MAX_ADDR_CELLS];
+	int i;
+
+	/* Check address type match */
+	if ((addr[0] ^ range[0]) & 0x03000000)
+		return -EINVAL;
+
+	if (of_out_of_range(addr + 1, range + 1, range + na + pna,
+			    na - 1, ns))
+		return -EINVAL;
+
+	/* Start with the parent range base.  */
+	memcpy(result, range + na, pna * 4);
+
+	/* Add in the child address offset, skipping high cell.  */
+	for (i = 0; i < na - 1; i++)
+		result[pna - 1 - i] +=
+			(addr[na - 1 - i] -
+			 range[na - 1 - i]);
+
+	memcpy(addr, result, pna * 4);
+
+	return 0;
+}
+
+static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
+{
+	u32 w = addr[0];
+
+	/* For PCI, we override whatever child busses may have used.  */
+	flags = 0;
+	switch((w >> 24) & 0x03) {
+	case 0x01:
+		flags |= IORESOURCE_IO;
+		break;
+
+	case 0x02: /* 32 bits */
+	case 0x03: /* 64 bits */
+		flags |= IORESOURCE_MEM;
+		break;
+	}
+	if (w & 0x40000000)
+		flags |= IORESOURCE_PREFETCH;
+	return flags;
+}
+
+/*
+ * SBUS bus specific translator
+ */
+
+static int of_bus_sbus_match(struct device_node *np)
+{
+	return !strcmp(np->name, "sbus") ||
+		!strcmp(np->name, "sbi");
+}
+
+static void of_bus_sbus_count_cells(struct device_node *child,
+				   int *addrc, int *sizec)
+{
+	if (addrc)
+		*addrc = 2;
+	if (sizec)
+		*sizec = 1;
+}
+
+/*
+ * FHC/Central bus specific translator.
+ *
+ * This is just needed to hard-code the address and size cell
+ * counts.  'fhc' and 'central' nodes lack the #address-cells and
+ * #size-cells properties, and if you walk to the root on such
+ * Enterprise boxes all you'll get is a #size-cells of 2 which is
+ * not what we want to use.
+ */
+static int of_bus_fhc_match(struct device_node *np)
+{
+	return !strcmp(np->name, "fhc") ||
+		!strcmp(np->name, "central");
+}
+
+#define of_bus_fhc_count_cells of_bus_sbus_count_cells
+
+/*
+ * Array of bus specific translators
+ */
+
+static struct of_bus of_busses[] = {
+	/* PCI */
+	{
+		.name = "pci",
+		.addr_prop_name = "assigned-addresses",
+		.match = of_bus_pci_match,
+		.count_cells = of_bus_pci_count_cells,
+		.map = of_bus_pci_map,
+		.get_flags = of_bus_pci_get_flags,
+	},
+	/* SIMBA */
+	{
+		.name = "simba",
+		.addr_prop_name = "assigned-addresses",
+		.match = of_bus_simba_match,
+		.count_cells = of_bus_pci_count_cells,
+		.map = of_bus_simba_map,
+		.get_flags = of_bus_pci_get_flags,
+	},
+	/* SBUS */
+	{
+		.name = "sbus",
+		.addr_prop_name = "reg",
+		.match = of_bus_sbus_match,
+		.count_cells = of_bus_sbus_count_cells,
+		.map = of_bus_default_map,
+		.get_flags = of_bus_default_get_flags,
+	},
+	/* FHC */
+	{
+		.name = "fhc",
+		.addr_prop_name = "reg",
+		.match = of_bus_fhc_match,
+		.count_cells = of_bus_fhc_count_cells,
+		.map = of_bus_default_map,
+		.get_flags = of_bus_default_get_flags,
+	},
+	/* Default */
+	{
+		.name = "default",
+		.addr_prop_name = "reg",
+		.match = NULL,
+		.count_cells = of_bus_default_count_cells,
+		.map = of_bus_default_map,
+		.get_flags = of_bus_default_get_flags,
+	},
+};
+
+static struct of_bus *of_match_bus(struct device_node *np)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
+		if (!of_busses[i].match || of_busses[i].match(np))
+			return &of_busses[i];
+	BUG();
+	return NULL;
+}
+
+static int __init build_one_resource(struct device_node *parent,
+				     struct of_bus *bus,
+				     struct of_bus *pbus,
+				     u32 *addr,
+				     int na, int ns, int pna)
+{
+	const u32 *ranges;
+	int rone, rlen;
+
+	ranges = of_get_property(parent, "ranges", &rlen);
+	if (ranges == NULL || rlen == 0) {
+		u32 result[OF_MAX_ADDR_CELLS];
+		int i;
+
+		memset(result, 0, pna * 4);
+		for (i = 0; i < na; i++)
+			result[pna - 1 - i] =
+				addr[na - 1 - i];
+
+		memcpy(addr, result, pna * 4);
+		return 0;
+	}
+
+	/* Now walk through the ranges */
+	rlen /= 4;
+	rone = na + pna + ns;
+	for (; rlen >= rone; rlen -= rone, ranges += rone) {
+		if (!bus->map(addr, ranges, na, ns, pna))
+			return 0;
+	}
+
+	/* When we miss an I/O space match on PCI, just pass it up
+	 * to the next PCI bridge and/or controller.
+	 */
+	if (!strcmp(bus->name, "pci") &&
+	    (addr[0] & 0x03000000) == 0x01000000)
+		return 0;
+
+	return 1;
+}
+
+static int __init use_1to1_mapping(struct device_node *pp)
+{
+	/* If we have a ranges property in the parent, use it.  */
+	if (of_find_property(pp, "ranges", NULL) != NULL)
+		return 0;
+
+	/* If the parent is the dma node of an ISA bus, pass
+	 * the translation up to the root.
+	 *
+	 * Some SBUS devices use intermediate nodes to express
+	 * hierarchy within the device itself.  These aren't
+	 * real bus nodes, and don't have a 'ranges' property.
+	 * But, we should still pass the translation work up
+	 * to the SBUS itself.
+	 */
+	if (!strcmp(pp->name, "dma") ||
+	    !strcmp(pp->name, "espdma") ||
+	    !strcmp(pp->name, "ledma") ||
+	    !strcmp(pp->name, "lebuffer"))
+		return 0;
+
+	/* Similarly for all PCI bridges, if we get this far
+	 * it lacks a ranges property, and this will include
+	 * cases like Simba.
+	 */
+	if (!strcmp(pp->name, "pci"))
+		return 0;
+
+	return 1;
+}
+
+static int of_resource_verbose;
+
+static void __init build_device_resources(struct of_device *op,
+					  struct device *parent)
+{
+	struct of_device *p_op;
+	struct of_bus *bus;
+	int na, ns;
+	int index, num_reg;
+	const void *preg;
+
+	if (!parent)
+		return;
+
+	p_op = to_of_device(parent);
+	bus = of_match_bus(p_op->node);
+	bus->count_cells(op->node, &na, &ns);
+
+	preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
+	if (!preg || num_reg == 0)
+		return;
+
+	/* Convert to num-cells.  */
+	num_reg /= 4;
+
+	/* Convert to num-entries.  */
+	num_reg /= na + ns;
+
+	/* Prevent overrunning the op->resources[] array.  */
+	if (num_reg > PROMREG_MAX) {
+		printk(KERN_WARNING "%s: Too many regs (%d), "
+		       "limiting to %d.\n",
+		       op->node->full_name, num_reg, PROMREG_MAX);
+		num_reg = PROMREG_MAX;
+	}
+
+	for (index = 0; index < num_reg; index++) {
+		struct resource *r = &op->resource[index];
+		u32 addr[OF_MAX_ADDR_CELLS];
+		const u32 *reg = (preg + (index * ((na + ns) * 4)));
+		struct device_node *dp = op->node;
+		struct device_node *pp = p_op->node;
+		struct of_bus *pbus, *dbus;
+		u64 size, result = OF_BAD_ADDR;
+		unsigned long flags;
+		int dna, dns;
+		int pna, pns;
+
+		size = of_read_addr(reg + na, ns);
+		memcpy(addr, reg, na * 4);
+
+		flags = bus->get_flags(addr, 0);
+
+		if (use_1to1_mapping(pp)) {
+			result = of_read_addr(addr, na);
+			goto build_res;
+		}
+
+		dna = na;
+		dns = ns;
+		dbus = bus;
+
+		while (1) {
+			dp = pp;
+			pp = dp->parent;
+			if (!pp) {
+				result = of_read_addr(addr, dna);
+				break;
+			}
+
+			pbus = of_match_bus(pp);
+			pbus->count_cells(dp, &pna, &pns);
+
+			if (build_one_resource(dp, dbus, pbus, addr,
+					       dna, dns, pna))
+				break;
+
+			flags = pbus->get_flags(addr, flags);
+
+			dna = pna;
+			dns = pns;
+			dbus = pbus;
+		}
+
+	build_res:
+		memset(r, 0, sizeof(*r));
+
+		if (of_resource_verbose)
+			printk("%s reg[%d] -> %lx\n",
+			       op->node->full_name, index,
+			       result);
+
+		if (result != OF_BAD_ADDR) {
+			if (tlb_type == hypervisor)
+				result &= 0x0fffffffffffffffUL;
+
+			r->start = result;
+			r->end = result + size - 1;
+			r->flags = flags;
+		}
+		r->name = op->node->name;
+	}
+}
+
+static struct device_node * __init
+apply_interrupt_map(struct device_node *dp, struct device_node *pp,
+		    const u32 *imap, int imlen, const u32 *imask,
+		    unsigned int *irq_p)
+{
+	struct device_node *cp;
+	unsigned int irq = *irq_p;
+	struct of_bus *bus;
+	phandle handle;
+	const u32 *reg;
+	int na, num_reg, i;
+
+	bus = of_match_bus(pp);
+	bus->count_cells(dp, &na, NULL);
+
+	reg = of_get_property(dp, "reg", &num_reg);
+	if (!reg || !num_reg)
+		return NULL;
+
+	imlen /= ((na + 3) * 4);
+	handle = 0;
+	for (i = 0; i < imlen; i++) {
+		int j;
+
+		for (j = 0; j < na; j++) {
+			if ((reg[j] & imask[j]) != imap[j])
+				goto next;
+		}
+		if (imap[na] == irq) {
+			handle = imap[na + 1];
+			irq = imap[na + 2];
+			break;
+		}
+
+	next:
+		imap += (na + 3);
+	}
+	if (i == imlen) {
+		/* Psycho and Sabre PCI controllers can have 'interrupt-map'
+		 * properties that do not include the on-board device
+		 * interrupts.  Instead, the device's 'interrupts' property
+		 * is already a fully specified INO value.
+		 *
+		 * Handle this by deciding that, if we didn't get a
+		 * match in the parent's 'interrupt-map', and the
+		 * parent is an IRQ translater, then use the parent as
+		 * our IRQ controller.
+		 */
+		if (pp->irq_trans)
+			return pp;
+
+		return NULL;
+	}
+
+	*irq_p = irq;
+	cp = of_find_node_by_phandle(handle);
+
+	return cp;
+}
+
+static unsigned int __init pci_irq_swizzle(struct device_node *dp,
+					   struct device_node *pp,
+					   unsigned int irq)
+{
+	const struct linux_prom_pci_registers *regs;
+	unsigned int bus, devfn, slot, ret;
+
+	if (irq < 1 || irq > 4)
+		return irq;
+
+	regs = of_get_property(dp, "reg", NULL);
+	if (!regs)
+		return irq;
+
+	bus = (regs->phys_hi >> 16) & 0xff;
+	devfn = (regs->phys_hi >> 8) & 0xff;
+	slot = (devfn >> 3) & 0x1f;
+
+	if (pp->irq_trans) {
+		/* Derived from Table 8-3, U2P User's Manual.  This branch
+		 * is handling a PCI controller that lacks a proper set of
+		 * interrupt-map and interrupt-map-mask properties.  The
+		 * Ultra-E450 is one example.
+		 *
+		 * The bit layout is BSSLL, where:
+		 * B: 0 on bus A, 1 on bus B
+		 * D: 2-bit slot number, derived from PCI device number as
+		 *    (dev - 1) for bus A, or (dev - 2) for bus B
+		 * L: 2-bit line number
+		 */
+		if (bus & 0x80) {
+			/* PBM-A */
+			bus  = 0x00;
+			slot = (slot - 1) << 2;
+		} else {
+			/* PBM-B */
+			bus  = 0x10;
+			slot = (slot - 2) << 2;
+		}
+		irq -= 1;
+
+		ret = (bus | slot | irq);
+	} else {
+		/* Going through a PCI-PCI bridge that lacks a set of
+		 * interrupt-map and interrupt-map-mask properties.
+		 */
+		ret = ((irq - 1 + (slot & 3)) & 3) + 1;
+	}
+
+	return ret;
+}
+
+static int of_irq_verbose;
+
+static unsigned int __init build_one_device_irq(struct of_device *op,
+						struct device *parent,
+						unsigned int irq)
+{
+	struct device_node *dp = op->node;
+	struct device_node *pp, *ip;
+	unsigned int orig_irq = irq;
+	int nid;
+
+	if (irq == 0xffffffff)
+		return irq;
+
+	if (dp->irq_trans) {
+		irq = dp->irq_trans->irq_build(dp, irq,
+					       dp->irq_trans->data);
+
+		if (of_irq_verbose)
+			printk("%s: direct translate %x --> %x\n",
+			       dp->full_name, orig_irq, irq);
+
+		goto out;
+	}
+
+	/* Something more complicated.  Walk up to the root, applying
+	 * interrupt-map or bus specific translations, until we hit
+	 * an IRQ translator.
+	 *
+	 * If we hit a bus type or situation we cannot handle, we
+	 * stop and assume that the original IRQ number was in a
+	 * format which has special meaning to it's immediate parent.
+	 */
+	pp = dp->parent;
+	ip = NULL;
+	while (pp) {
+		const void *imap, *imsk;
+		int imlen;
+
+		imap = of_get_property(pp, "interrupt-map", &imlen);
+		imsk = of_get_property(pp, "interrupt-map-mask", NULL);
+		if (imap && imsk) {
+			struct device_node *iret;
+			int this_orig_irq = irq;
+
+			iret = apply_interrupt_map(dp, pp,
+						   imap, imlen, imsk,
+						   &irq);
+
+			if (of_irq_verbose)
+				printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
+				       op->node->full_name,
+				       pp->full_name, this_orig_irq,
+				       (iret ? iret->full_name : "NULL"), irq);
+
+			if (!iret)
+				break;
+
+			if (iret->irq_trans) {
+				ip = iret;
+				break;
+			}
+		} else {
+			if (!strcmp(pp->name, "pci")) {
+				unsigned int this_orig_irq = irq;
+
+				irq = pci_irq_swizzle(dp, pp, irq);
+				if (of_irq_verbose)
+					printk("%s: PCI swizzle [%s] "
+					       "%x --> %x\n",
+					       op->node->full_name,
+					       pp->full_name, this_orig_irq,
+					       irq);
+
+			}
+
+			if (pp->irq_trans) {
+				ip = pp;
+				break;
+			}
+		}
+		dp = pp;
+		pp = pp->parent;
+	}
+	if (!ip)
+		return orig_irq;
+
+	irq = ip->irq_trans->irq_build(op->node, irq,
+				       ip->irq_trans->data);
+	if (of_irq_verbose)
+		printk("%s: Apply IRQ trans [%s] %x --> %x\n",
+		       op->node->full_name, ip->full_name, orig_irq, irq);
+
+out:
+	nid = of_node_to_nid(dp);
+	if (nid != -1) {
+		cpumask_t numa_mask = *cpumask_of_node(nid);
+
+		irq_set_affinity(irq, &numa_mask);
+	}
+
+	return irq;
+}
+
+static struct of_device * __init scan_one_device(struct device_node *dp,
+						 struct device *parent)
+{
+	struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
+	const unsigned int *irq;
+	struct dev_archdata *sd;
+	int len, i;
+
+	if (!op)
+		return NULL;
+
+	sd = &op->dev.archdata;
+	sd->prom_node = dp;
+	sd->op = op;
+
+	op->node = dp;
+
+	op->clock_freq = of_getintprop_default(dp, "clock-frequency",
+					       (25*1000*1000));
+	op->portid = of_getintprop_default(dp, "upa-portid", -1);
+	if (op->portid == -1)
+		op->portid = of_getintprop_default(dp, "portid", -1);
+
+	irq = of_get_property(dp, "interrupts", &len);
+	if (irq) {
+		op->num_irqs = len / 4;
+
+		/* Prevent overrunning the op->irqs[] array.  */
+		if (op->num_irqs > PROMINTR_MAX) {
+			printk(KERN_WARNING "%s: Too many irqs (%d), "
+			       "limiting to %d.\n",
+			       dp->full_name, op->num_irqs, PROMINTR_MAX);
+			op->num_irqs = PROMINTR_MAX;
+		}
+		memcpy(op->irqs, irq, op->num_irqs * 4);
+	} else {
+		op->num_irqs = 0;
+	}
+
+	build_device_resources(op, parent);
+	for (i = 0; i < op->num_irqs; i++)
+		op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
+
+	op->dev.parent = parent;
+	op->dev.bus = &of_platform_bus_type;
+	if (!parent)
+		dev_set_name(&op->dev, "root");
+	else
+		dev_set_name(&op->dev, "%08x", dp->node);
+
+	if (of_device_register(op)) {
+		printk("%s: Could not register of device.\n",
+		       dp->full_name);
+		kfree(op);
+		op = NULL;
+	}
+
+	return op;
+}
+
+static void __init scan_tree(struct device_node *dp, struct device *parent)
+{
+	while (dp) {
+		struct of_device *op = scan_one_device(dp, parent);
+
+		if (op)
+			scan_tree(dp->child, &op->dev);
+
+		dp = dp->sibling;
+	}
+}
+
+static void __init scan_of_devices(void)
+{
+	struct device_node *root = of_find_node_by_path("/");
+	struct of_device *parent;
+
+	parent = scan_one_device(root, NULL);
+	if (!parent)
+		return;
+
+	scan_tree(root->child, &parent->dev);
+}
+
+static int __init of_bus_driver_init(void)
+{
+	int err;
+
+	err = of_bus_type_init(&of_platform_bus_type, "of");
+	if (!err)
+		scan_of_devices();
+
+	return err;
+}
+
+postcore_initcall(of_bus_driver_init);
+
+static int __init of_debug(char *str)
+{
+	int val = 0;
+
+	get_option(&str, &val);
+	if (val & 1)
+		of_resource_verbose = 1;
+	if (val & 2)
+		of_irq_verbose = 1;
+	return 1;
+}
+
+__setup("of_debug=", of_debug);